5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <stdlib.h> /* for exit() */
33 #ifdef HAVE_SYS_TYPES_H
34 # include <sys/types.h>
37 #ifdef HAVE_SYS_SOCKET_H
38 #include <sys/socket.h>
41 #ifdef HAVE_NETINET_IN_H
42 #include <netinet/in.h>
45 #ifdef HAVE_SYS_STAT_H
46 # include <sys/stat.h>
61 #ifdef HAVE_ARPA_INET_H
62 #include <arpa/inet.h>
65 #if defined(__APPLE__) && defined(__LP64__)
66 #include <sys/utsname.h>
72 #include <wsutil/crash_info.h>
75 #include "wsutil/wsgetopt.h"
83 # include <sys/prctl.h>
84 # include <sys/capability.h>
87 #include "ringbuffer.h"
88 #include "clopts_common.h"
89 #include "cmdarg_err.h"
90 #include "version_info.h"
92 #include "capture-pcap-util.h"
94 #include "capture-wpcap.h"
100 #include "capture-wpcap.h"
101 #include <wsutil/unicode-utils.h>
108 #ifdef NEED_INET_V6DEFS_H
109 # include "wsutil/inet_v6defs.h"
112 #include <wsutil/privileges.h>
114 #include "sync_pipe.h"
116 #include "capture_opts.h"
117 #include "capture_session.h"
118 #include "capture_ifinfo.h"
119 #include "capture_sync.h"
121 #include "conditions.h"
122 #include "capture_stop_conditions.h"
124 #include "wsutil/tempfile.h"
126 #include "wsutil/file_util.h"
128 #include "ws80211_utils.h"
131 * Get information about libpcap format from "wiretap/libpcap.h".
132 * XXX - can we just use pcap_open_offline() to read the pipe?
134 #include "wiretap/libpcap.h"
136 /**#define DEBUG_DUMPCAP**/
137 /**#define DEBUG_CHILD_DUMPCAP**/
141 #include <conio.h> /* _getch() */
145 #ifdef DEBUG_CHILD_DUMPCAP
146 FILE *debug_log; /* for logging debug messages to */
147 /* a file if DEBUG_CHILD_DUMPCAP */
151 static GAsyncQueue *pcap_queue;
152 static gint64 pcap_queue_bytes;
153 static gint64 pcap_queue_packets;
154 static gint64 pcap_queue_byte_limit = 0;
155 static gint64 pcap_queue_packet_limit = 0;
157 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
159 static gchar *sig_pipe_name = NULL;
160 static HANDLE sig_pipe_handle = NULL;
161 static gboolean signal_pipe_check_running(void);
165 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
166 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
169 /** Stop a low-level capture (stops the capture child). */
170 static void capture_loop_stop(void);
171 /** Close a pipe, or socket if \a from_socket is TRUE */
172 static void cap_pipe_close(int pipe_fd, gboolean from_socket _U_);
176 * Enable kernel BPF JIT compiler if available.
177 * If any calls fail, just drive on - the JIT compiler might not be
178 * enabled, but filtering will still work, and it's not clear what
179 * we could do if the calls fail; should we just report the error
180 * and not continue to capture, should we report it as a warning, or
184 enable_kernel_bpf_jit_compiler(void)
188 static const char file[] = "/proc/sys/net/core/bpf_jit_enable";
190 fd = open(file, O_WRONLY);
194 written = write(fd, "1", strlen("1"));
200 #if !defined (__linux__)
201 #ifndef HAVE_PCAP_BREAKLOOP
203 * We don't have pcap_breakloop(), which is the only way to ensure that
204 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
205 * won't, if the call to read the next packet or batch of packets is
206 * is interrupted by a signal on UN*X, just go back and try again to
209 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
210 * the signal handler, set a flag to stop capturing; however, without
211 * a guarantee of that sort, we can't guarantee that we'll stop capturing
212 * if the read will be retried and won't time out if no packets arrive.
214 * Therefore, on at least some platforms, we work around the lack of
215 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
216 * to wait for packets to arrive, so that we're probably going to be
217 * blocked in the select() when the signal arrives, and can just bail
218 * out of the loop at that point.
220 * However, we don't want to do that on BSD (because "select()" doesn't work
221 * correctly on BPF devices on at least some releases of some flavors of
222 * BSD), and we don't want to do it on Windows (because "select()" is
223 * something for sockets, not for arbitrary handles). (Note that "Windows"
224 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
225 * using WinPcap, not a UNIX libpcap.)
227 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
228 * on BSD times out even if no packets have arrived, so we'll eventually
229 * exit pcap_dispatch() with an indication that no packets have arrived,
230 * and will break out of the capture loop at that point.
232 * On Windows, we can't send a SIGINT to stop capturing, so none of this
233 * applies in any case.
235 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
236 * want to include it if it's not present on this platform, however.
238 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
239 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
241 # define MUST_DO_SELECT
242 # endif /* avoid select */
243 #endif /* HAVE_PCAP_BREAKLOOP */
245 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
246 * in pcap_dispatch(); on the other hand, select() works just fine there.
247 * Hence we use a select for that come what may.
249 * XXX - with TPACKET_V1 and TPACKET_V2, it currently uses select()
250 * internally, and, with TPACKET_V3, once that's supported, it'll
251 * support timeouts, at least as I understand the way the code works.
253 #define MUST_DO_SELECT
256 /** init the capture filter */
259 INITFILTER_BAD_FILTER,
260 INITFILTER_OTHER_ERROR
261 } initfilter_status_t;
264 STATE_EXPECT_REC_HDR,
277 typedef struct _pcap_options {
282 #ifdef MUST_DO_SELECT
283 int pcap_fd; /**< pcap file descriptor */
290 gboolean ts_nsec; /**< TRUE if we're using nanosecond precision. */
291 /**< capture pipe (unix only "input file") */
292 gboolean from_cap_pipe; /**< TRUE if we are capturing data from a capture pipe */
293 gboolean from_cap_socket; /**< TRUE if we're capturing from socket */
294 struct pcap_hdr cap_pipe_hdr; /**< Pcap header when capturing from a pipe */
295 struct pcaprec_modified_hdr cap_pipe_rechdr; /**< Pcap record header when capturing from a pipe */
297 HANDLE cap_pipe_h; /**< The handle of the capture pipe */
299 int cap_pipe_fd; /**< the file descriptor of the capture pipe */
300 gboolean cap_pipe_modified; /**< TRUE if data in the pipe uses modified pcap headers */
301 gboolean cap_pipe_byte_swapped; /**< TRUE if data in the pipe is byte swapped */
303 char * cap_pipe_buf; /**< Pointer to the data buffer we read into */
304 DWORD cap_pipe_bytes_to_read; /**< Used by cap_pipe_dispatch */
305 DWORD cap_pipe_bytes_read; /**< Used by cap_pipe_dispatch */
307 size_t cap_pipe_bytes_to_read; /**< Used by cap_pipe_dispatch */
308 size_t cap_pipe_bytes_read; /**< Used by cap_pipe_dispatch */
310 cap_pipe_state_t cap_pipe_state;
311 cap_pipe_err_t cap_pipe_err;
314 GMutex *cap_pipe_read_mtx;
315 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
319 typedef struct _loop_data {
321 gboolean go; /**< TRUE as long as we're supposed to keep capturing */
322 int err; /**< if non-zero, error seen while capturing */
323 gint packet_count; /**< Number of packets we have already captured */
324 gint packet_max; /**< Number of packets we're supposed to capture - 0 means infinite */
325 guint inpkts_to_sync_pipe; /**< Packets not already send out to the sync_pipe */
327 gboolean report_packet_count; /**< Set by SIGINFO handler; print packet count */
333 guint64 bytes_written;
334 guint32 autostop_files;
337 typedef struct _pcap_queue_element {
338 pcap_options *pcap_opts;
339 struct pcap_pkthdr phdr;
341 } pcap_queue_element;
344 * Standard secondary message for unexpected errors.
346 static const char please_report[] =
347 "Please report this to the Wireshark developers.\n"
348 "http://bugs.wireshark.org/\n"
349 "(This is not a crash; please do not report it as such.)";
352 * This needs to be static, so that the SIGINT handler can clear the "go"
355 static loop_data global_ld;
359 * Timeout, in milliseconds, for reads from the stream of captured packets
360 * from a capture device.
362 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
363 * 64-bit applications, with sub-second timeouts not to work. The bug is
364 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
366 #if defined(__APPLE__) && defined(__LP64__)
367 static gboolean need_timeout_workaround;
369 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
371 #define CAP_READ_TIMEOUT 250
375 * Timeout, in microseconds, for reads from the stream of captured packets
376 * from a pipe. Pipes don't have the same problem that BPF devices do
377 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
378 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
379 * of the offending versions of Snow Leopard.
381 * On Windows this value is converted to milliseconds and passed to
382 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
383 * will return immediately.
386 #define PIPE_READ_TIMEOUT 100000
388 #define PIPE_READ_TIMEOUT 250000
391 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
394 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
395 const char *message, gpointer user_data _U_);
397 /* capture related options */
398 static capture_options global_capture_opts;
399 static gboolean quiet = FALSE;
400 static gboolean use_threads = FALSE;
401 static guint64 start_time;
403 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
405 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
407 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
408 int err, gboolean is_close);
410 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
412 static void report_new_capture_file(const char *filename);
413 static void report_packet_count(unsigned int packet_count);
414 static void report_packet_drops(guint32 received, guint32 pcap_drops, guint32 drops, guint32 flushed, gchar *name);
415 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
416 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
418 #define MSG_MAX_LENGTH 4096
420 /* Copied from pcapio.c pcapng_write_interface_statistics_block()*/
422 create_timestamp(void) {
432 * Current time, represented as 100-nanosecond intervals since
433 * January 1, 1601, 00:00:00 UTC.
435 * I think DWORD might be signed, so cast both parts of "now"
436 * to guint32 so that the sign bit doesn't get treated specially.
438 * Windows 8 provides GetSystemTimePreciseAsFileTime which we
439 * might want to use instead.
441 GetSystemTimeAsFileTime(&now);
442 timestamp = (((guint64)(guint32)now.dwHighDateTime) << 32) +
443 (guint32)now.dwLowDateTime;
446 * Convert to same thing but as 1-microsecond, i.e. 1000-nanosecond,
452 * Subtract difference, in microseconds, between January 1, 1601
453 * 00:00:00 UTC and January 1, 1970, 00:00:00 UTC.
455 timestamp -= G_GINT64_CONSTANT(11644473600000000U);
458 * Current time, represented as seconds and microseconds since
459 * January 1, 1970, 00:00:00 UTC.
461 gettimeofday(&now, NULL);
464 * Convert to delta in microseconds.
466 timestamp = (guint64)(now.tv_sec) * 1000000 +
467 (guint64)(now.tv_usec);
473 print_usage(gboolean print_ver)
480 "Dumpcap " VERSION "%s\n"
481 "Capture network packets and dump them into a pcapng file.\n"
482 "See http://www.wireshark.org for more information.\n",
483 wireshark_svnversion);
487 fprintf(output, "\nUsage: dumpcap [options] ...\n");
488 fprintf(output, "\n");
489 fprintf(output, "Capture interface:\n");
490 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback),\n"
491 " or for remote capturing, use one of these formats:\n"
492 " rpcap://<host>/<interface>\n"
493 " TCP@<host>:<port>\n");
494 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
495 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
496 fprintf(output, " -p don't capture in promiscuous mode\n");
497 #ifdef HAVE_PCAP_CREATE
498 fprintf(output, " -I capture in monitor mode, if available\n");
500 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
501 fprintf(output, " -B <buffer size> size of kernel buffer in MB (def: %dMB)\n", DEFAULT_CAPTURE_BUFFER_SIZE);
503 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
504 fprintf(output, " -D print list of interfaces and exit\n");
505 fprintf(output, " -L print list of link-layer types of iface and exit\n");
506 #ifdef HAVE_BPF_IMAGE
507 fprintf(output, " -d print generated BPF code for capture filter\n");
509 fprintf(output, " -k set channel on wifi interface <freq>,[<type>]\n");
510 fprintf(output, " -S print statistics for each interface once per second\n");
511 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
512 fprintf(output, "\n");
513 #ifdef HAVE_PCAP_REMOTE
514 fprintf(output, "RPCAP options:\n");
515 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
516 fprintf(output, " -u use UDP for RPCAP data transfer\n");
517 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
518 #ifdef HAVE_PCAP_SETSAMPLING
519 fprintf(output, " -m <sampling type> use packet sampling\n");
520 fprintf(output, " count:NUM - capture one packet of every NUM\n");
521 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
524 fprintf(output, "Stop conditions:\n");
525 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
526 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
527 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
528 fprintf(output, " files:NUM - stop after NUM files\n");
529 /*fprintf(output, "\n");*/
530 fprintf(output, "Output (files):\n");
531 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
532 fprintf(output, " -g enable group read access on the output file(s)\n");
533 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
534 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
535 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
536 fprintf(output, " -n use pcapng format instead of pcap (default)\n");
537 fprintf(output, " -P use libpcap format instead of pcapng\n");
538 fprintf(output, " --capture-comment <comment>\n");
539 fprintf(output, " add a capture comment to the output file\n");
540 fprintf(output, " (only for pcapng)\n");
541 fprintf(output, "\n");
542 fprintf(output, "Miscellaneous:\n");
543 fprintf(output, " -N <packet_limit> maximum number of packets buffered within dumpcap\n");
544 fprintf(output, " -C <byte_limit> maximum number of bytes used for buffering packets\n");
545 fprintf(output, " within dumpcap\n");
546 fprintf(output, " -t use a separate thread per interface\n");
547 fprintf(output, " -q don't report packet capture counts\n");
548 fprintf(output, " -v print version information and exit\n");
549 fprintf(output, " -h display this help and exit\n");
550 fprintf(output, "\n");
552 fprintf(output, "WARNING: dumpcap will enable kernel BPF JIT compiler if available.\n");
553 fprintf(output, "You might want to reset it\n");
554 fprintf(output, "By doing \"echo 0 > /proc/sys/net/core/bpf_jit_enable\"\n");
555 fprintf(output, "\n");
557 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcapng\n");
558 fprintf(output, "\"Capture packets from interface eth0 until 60s passed into output.pcapng\"\n");
559 fprintf(output, "\n");
560 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
564 show_version(GString *comp_info_str, GString *runtime_info_str)
567 "Dumpcap " VERSION "%s\n"
572 "See http://www.wireshark.org for more information.\n",
573 wireshark_svnversion, get_copyright_info(), comp_info_str->str, runtime_info_str->str);
577 * Report an error in command-line arguments.
580 cmdarg_err(const char *fmt, ...)
586 /* Generate a 'special format' message back to parent */
588 msg = g_strdup_vprintf(fmt, ap);
589 sync_pipe_errmsg_to_parent(2, msg, "");
594 fprintf(stderr, "dumpcap: ");
595 vfprintf(stderr, fmt, ap);
596 fprintf(stderr, "\n");
602 * Report additional information for an error in command-line arguments.
605 cmdarg_err_cont(const char *fmt, ...)
612 msg = g_strdup_vprintf(fmt, ap);
613 sync_pipe_errmsg_to_parent(2, msg, "");
618 vfprintf(stderr, fmt, ap);
619 fprintf(stderr, "\n");
626 #if 0 /* Set to enable capability debugging */
627 /* see 'man cap_to_text()' for explanation of output */
628 /* '=' means 'all= ' ie: no capabilities */
629 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
631 print_caps(const char *pfx) {
632 cap_t caps = cap_get_proc();
633 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
634 "%s: EUID: %d Capabilities: %s", pfx,
635 geteuid(), cap_to_text(caps, NULL));
638 print_caps(const char *pfx _U_) {
643 relinquish_all_capabilities(void)
645 /* Drop any and all capabilities this process may have. */
646 /* Allowed whether or not process has any privileges. */
647 cap_t caps = cap_init(); /* all capabilities initialized to off */
648 print_caps("Pre-clear");
649 if (cap_set_proc(caps)) {
650 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
652 print_caps("Post-clear");
658 open_capture_device(interface_options *interface_opts,
659 char (*open_err_str)[PCAP_ERRBUF_SIZE])
662 #ifdef HAVE_PCAP_CREATE
665 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
666 struct pcap_rmtauth auth;
669 /* Open the network interface to capture from it.
670 Some versions of libpcap may put warnings into the error buffer
671 if they succeed; to tell if that's happened, we have to clear
672 the error buffer, and check if it's still a null string. */
673 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Entering open_capture_device().");
674 (*open_err_str)[0] = '\0';
675 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
677 * If we're opening a remote device, use pcap_open(); that's currently
678 * the only open routine that supports remote devices.
680 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
681 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
682 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
683 auth.username = interface_opts->auth_username;
684 auth.password = interface_opts->auth_password;
686 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
687 "Calling pcap_open() using name %s, snaplen %d, promisc_mode %d, datatx_udp %d, nocap_rpcap %d.",
688 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode,
689 interface_opts->datatx_udp, interface_opts->nocap_rpcap);
690 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
692 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
693 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
694 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
695 CAP_READ_TIMEOUT, &auth, *open_err_str);
696 if (pcap_h == NULL) {
697 /* Error - did pcap actually supply an error message? */
698 if ((*open_err_str)[0] == '\0') {
699 /* Work around known WinPcap bug wherein no error message is
700 filled in on a failure to open an rpcap: URL. */
701 g_strlcpy(*open_err_str,
702 "Unknown error (pcap bug; actual error cause not reported)",
703 sizeof *open_err_str);
706 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
707 "pcap_open() returned %p.", (void *)pcap_h);
712 * If we're not opening a remote device, use pcap_create() and
713 * pcap_activate() if we have them, so that we can set the buffer
714 * size, otherwise use pcap_open_live().
716 #ifdef HAVE_PCAP_CREATE
717 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
718 "Calling pcap_create() using %s.", interface_opts->name);
719 pcap_h = pcap_create(interface_opts->name, *open_err_str);
720 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
721 "pcap_create() returned %p.", (void *)pcap_h);
722 if (pcap_h != NULL) {
723 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
724 "Calling pcap_set_snaplen() with snaplen %d.", interface_opts->snaplen);
725 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
726 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
727 "Calling pcap_set_promisc() with promisc_mode %d.", interface_opts->promisc_mode);
728 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
729 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
731 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
732 "buffersize %d.", interface_opts->buffer_size);
733 if (interface_opts->buffer_size != 0) {
734 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
736 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
737 "monitor_mode %d.", interface_opts->monitor_mode);
738 if (interface_opts->monitor_mode)
739 pcap_set_rfmon(pcap_h, 1);
740 err = pcap_activate(pcap_h);
741 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
742 "pcap_activate() returned %d.", err);
744 /* Failed to activate, set to NULL */
745 if (err == PCAP_ERROR)
746 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
748 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
754 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
755 "pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
756 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode);
757 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
758 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
760 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
761 "pcap_open_live() returned %p.", (void *)pcap_h);
764 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
769 get_capture_device_open_failure_messages(const char *open_err_str,
775 char *errmsg, size_t errmsg_len,
776 char *secondary_errmsg,
777 size_t secondary_errmsg_len)
780 const char *libpcap_warn;
781 static const char ppamsg[] = "can't find PPA for ";
784 g_snprintf(errmsg, (gulong) errmsg_len,
785 "The capture session could not be initiated (%s).", open_err_str);
788 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
790 "In order to capture packets, WinPcap must be installed; see\n"
792 " http://www.winpcap.org/\n"
796 " http://www.mirrors.wiretapped.net/security/packet-capture/winpcap/\n"
800 " http://winpcap.cs.pu.edu.tw/\n"
802 "for a downloadable version of WinPcap and for instructions on how to install\n"
805 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
807 "Please check that \"%s\" is the proper interface.\n"
810 "Help can be found at:\n"
812 " http://wiki.wireshark.org/WinPcap\n"
813 " http://wiki.wireshark.org/CaptureSetup\n",
817 /* If we got a "can't find PPA for X" message, warn the user (who
818 is running dumpcap on HP-UX) that they don't have a version of
819 libpcap that properly handles HP-UX (libpcap 0.6.x and later
820 versions, which properly handle HP-UX, say "can't find /dev/dlpi
821 PPA for X" rather than "can't find PPA for X"). */
822 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
825 "You are running (T)Wireshark with a version of the libpcap library\n"
826 "that doesn't handle HP-UX network devices well; this means that\n"
827 "(T)Wireshark may not be able to capture packets.\n"
829 "To fix this, you should install libpcap 0.6.2, or a later version\n"
830 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
831 "packaged binary form from the Software Porting And Archive Centre\n"
832 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
833 "at the URL lists a number of mirror sites.";
837 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
838 "Please check to make sure you have sufficient permissions, and that you have "
839 "the proper interface or pipe specified.%s", libpcap_warn);
843 /* Set the data link type on a pcap. */
845 set_pcap_linktype(pcap_t *pcap_h, int linktype,
846 #ifdef HAVE_PCAP_SET_DATALINK
851 char *errmsg, size_t errmsg_len,
852 char *secondary_errmsg, size_t secondary_errmsg_len)
854 char *set_linktype_err_str;
857 return TRUE; /* just use the default */
858 #ifdef HAVE_PCAP_SET_DATALINK
859 if (pcap_set_datalink(pcap_h, linktype) == 0)
860 return TRUE; /* no error */
861 set_linktype_err_str = pcap_geterr(pcap_h);
863 /* Let them set it to the type it is; reject any other request. */
864 if (get_pcap_linktype(pcap_h, name) == linktype)
865 return TRUE; /* no error */
866 set_linktype_err_str =
867 "That DLT isn't one of the DLTs supported by this device";
869 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
870 set_linktype_err_str);
872 * If the error isn't "XXX is not one of the DLTs supported by this device",
873 * tell the user to tell the Wireshark developers about it.
875 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
876 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
878 secondary_errmsg[0] = '\0';
883 compile_capture_filter(const char *iface, pcap_t *pcap_h,
884 struct bpf_program *fcode, const char *cfilter)
886 bpf_u_int32 netnum, netmask;
887 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
889 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
891 * Well, we can't get the netmask for this interface; it's used
892 * only for filters that check for broadcast IP addresses, so
893 * we just punt and use 0. It might be nice to warn the user,
894 * but that's a pain in a GUI application, as it'd involve popping
895 * up a message box, and it's not clear how often this would make
896 * a difference (only filters that check for IP broadcast addresses
900 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
905 * Sigh. Older versions of libpcap don't properly declare the
906 * third argument to pcap_compile() as a const pointer. Cast
909 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
914 #ifdef HAVE_BPF_IMAGE
916 show_filter_code(capture_options *capture_opts)
918 interface_options interface_opts;
920 gchar open_err_str[PCAP_ERRBUF_SIZE];
921 char errmsg[MSG_MAX_LENGTH+1];
922 char secondary_errmsg[MSG_MAX_LENGTH+1];
923 struct bpf_program fcode;
924 struct bpf_insn *insn;
928 for (j = 0; j < capture_opts->ifaces->len; j++) {
929 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
930 pcap_h = open_capture_device(&interface_opts, &open_err_str);
931 if (pcap_h == NULL) {
932 /* Open failed; get messages */
933 get_capture_device_open_failure_messages(open_err_str,
935 errmsg, sizeof errmsg,
937 sizeof secondary_errmsg);
938 /* And report them */
939 report_capture_error(errmsg, secondary_errmsg);
943 /* Set the link-layer type. */
944 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
945 errmsg, sizeof errmsg,
946 secondary_errmsg, sizeof secondary_errmsg)) {
948 report_capture_error(errmsg, secondary_errmsg);
952 /* OK, try to compile the capture filter. */
953 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
954 interface_opts.cfilter)) {
956 report_cfilter_error(capture_opts, j, errmsg);
961 /* Now print the filter code. */
962 insn = fcode.bf_insns;
964 for (i = 0; i < fcode.bf_len; insn++, i++)
965 printf("%s\n", bpf_image(insn, i));
967 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
968 /* to remove any suid privileges. */
969 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
970 /* (euid/egid have already previously been set to ruid/rgid. */
971 /* (See comment in main() for details) */
973 relinquish_special_privs_perm();
975 relinquish_all_capabilities();
978 /* Let our parent know we succeeded. */
979 pipe_write_block(2, SP_SUCCESS, NULL);
986 * capture_interface_list() is expected to do the right thing to get
987 * a list of interfaces.
989 * In most of the programs in the Wireshark suite, "the right thing"
990 * is to run dumpcap and ask it for the list, because dumpcap may
991 * be the only program in the suite with enough privileges to get
994 * In dumpcap itself, however, we obviously can't run dumpcap to
995 * ask for the list. Therefore, our capture_interface_list() should
996 * just call get_interface_list().
999 capture_interface_list(int *err, char **err_str, void(*update_cb)(void) _U_)
1001 return get_interface_list(err, err_str);
1005 * Get the data-link type for a libpcap device.
1006 * This works around AIX 5.x's non-standard and incompatible-with-the-
1007 * rest-of-the-universe libpcap.
1010 get_pcap_linktype(pcap_t *pch, const char *devicename
1018 const char *ifacename;
1021 linktype = pcap_datalink(pch);
1025 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
1026 * rather than DLT_ values for link-layer types; the ifType values
1027 * for LAN devices are:
1034 * and the ifType value for a loopback device is 24.
1036 * The AIX names for LAN devices begin with:
1043 * and the AIX names for loopback devices begin with "lo".
1045 * (The difference between "Ethernet" and "802.3" is presumably
1046 * whether packets have an Ethernet header, with a packet type,
1047 * or an 802.3 header, with a packet length, followed by an 802.2
1048 * header and possibly a SNAP header.)
1050 * If the device name matches "linktype" interpreted as an ifType
1051 * value, rather than as a DLT_ value, we will assume this is AIX's
1052 * non-standard, incompatible libpcap, rather than a standard libpcap,
1053 * and will map the link-layer type to the standard DLT_ value for
1054 * that link-layer type, as that's what the rest of Wireshark expects.
1056 * (This means the capture files won't be readable by a tcpdump
1057 * linked with AIX's non-standard libpcap, but so it goes. They
1058 * *will* be readable by standard versions of tcpdump, Wireshark,
1061 * XXX - if we conclude we're using AIX libpcap, should we also
1062 * set a flag to cause us to assume the time stamps are in
1063 * seconds-and-nanoseconds form, and to convert them to
1064 * seconds-and-microseconds form before processing them and
1069 * Find the last component of the device name, which is the
1072 ifacename = strchr(devicename, '/');
1073 if (ifacename == NULL)
1074 ifacename = devicename;
1076 /* See if it matches any of the LAN device names. */
1077 if (strncmp(ifacename, "en", 2) == 0) {
1078 if (linktype == 6) {
1080 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
1084 } else if (strncmp(ifacename, "et", 2) == 0) {
1085 if (linktype == 7) {
1087 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
1088 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
1093 } else if (strncmp(ifacename, "tr", 2) == 0) {
1094 if (linktype == 9) {
1096 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
1097 * DLT_IEEE802, which is what's used for Token Ring.
1101 } else if (strncmp(ifacename, "fi", 2) == 0) {
1102 if (linktype == 15) {
1104 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
1108 } else if (strncmp(ifacename, "lo", 2) == 0) {
1109 if (linktype == 24) {
1111 * That's the RFC 1573 value for "software loopback" devices; map it
1112 * to DLT_NULL, which is what's used for loopback devices on BSD.
1122 static data_link_info_t *
1123 create_data_link_info(int dlt)
1125 data_link_info_t *data_link_info;
1128 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
1129 data_link_info->dlt = dlt;
1130 text = pcap_datalink_val_to_name(dlt);
1132 data_link_info->name = g_strdup(text);
1134 data_link_info->name = g_strdup_printf("DLT %d", dlt);
1135 text = pcap_datalink_val_to_description(dlt);
1137 data_link_info->description = g_strdup(text);
1139 data_link_info->description = NULL;
1140 return data_link_info;
1144 * Get the capabilities of a network device.
1146 static if_capabilities_t *
1147 get_if_capabilities(const char *devicename, gboolean monitor_mode
1148 #ifndef HAVE_PCAP_CREATE
1153 if_capabilities_t *caps;
1154 char errbuf[PCAP_ERRBUF_SIZE];
1156 #ifdef HAVE_PCAP_CREATE
1160 #ifdef HAVE_PCAP_LIST_DATALINKS
1164 data_link_info_t *data_link_info;
1167 * Allocate the interface capabilities structure.
1169 caps = (if_capabilities_t *)g_malloc(sizeof *caps);
1172 * WinPcap 4.1.2, and possibly earlier versions, have a bug
1173 * wherein, when an open with an rpcap: URL fails, the error
1174 * message for the error is not copied to errbuf and whatever
1175 * on-the-stack junk is in errbuf is treated as the error
1178 * To work around that (and any other bugs of that sort, we
1179 * initialize errbuf to an empty string. If we get an error
1180 * and the string is empty, we report it as an unknown error.
1181 * (If we *don't* get an error, and the string is *non*-empty,
1182 * that could be a warning returned, such as "can't turn
1183 * promiscuous mode on"; we currently don't do so.)
1186 #ifdef HAVE_PCAP_OPEN
1187 pch = pcap_open(devicename, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1188 caps->can_set_rfmon = FALSE;
1190 if (err_str != NULL)
1191 *err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
1195 #elif defined(HAVE_PCAP_CREATE)
1196 pch = pcap_create(devicename, errbuf);
1198 if (err_str != NULL)
1199 *err_str = g_strdup(errbuf);
1203 status = pcap_can_set_rfmon(pch);
1206 if (status == PCAP_ERROR)
1207 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1210 *err_str = g_strdup(pcap_statustostr(status));
1216 caps->can_set_rfmon = FALSE;
1217 else if (status == 1) {
1218 caps->can_set_rfmon = TRUE;
1220 pcap_set_rfmon(pch, 1);
1222 if (err_str != NULL) {
1223 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1231 status = pcap_activate(pch);
1233 /* Error. We ignore warnings (status > 0). */
1234 if (err_str != NULL) {
1235 if (status == PCAP_ERROR)
1236 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1239 *err_str = g_strdup(pcap_statustostr(status));
1246 pch = pcap_open_live(devicename, MIN_PACKET_SIZE, 0, 0, errbuf);
1247 caps->can_set_rfmon = FALSE;
1249 if (err_str != NULL)
1250 *err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
1255 deflt = get_pcap_linktype(pch, devicename);
1256 #ifdef HAVE_PCAP_LIST_DATALINKS
1257 nlt = pcap_list_datalinks(pch, &linktypes);
1258 if (nlt == 0 || linktypes == NULL) {
1260 if (err_str != NULL)
1261 *err_str = NULL; /* an empty list doesn't mean an error */
1265 caps->data_link_types = NULL;
1266 for (i = 0; i < nlt; i++) {
1267 data_link_info = create_data_link_info(linktypes[i]);
1270 * XXX - for 802.11, make the most detailed 802.11
1271 * version the default, rather than the one the
1272 * device has as the default?
1274 if (linktypes[i] == deflt)
1275 caps->data_link_types = g_list_prepend(caps->data_link_types,
1278 caps->data_link_types = g_list_append(caps->data_link_types,
1281 #ifdef HAVE_PCAP_FREE_DATALINKS
1282 pcap_free_datalinks(linktypes);
1285 * In Windows, there's no guarantee that if you have a library
1286 * built with one version of the MSVC++ run-time library, and
1287 * it returns a pointer to allocated data, you can free that
1288 * data from a program linked with another version of the
1289 * MSVC++ run-time library.
1291 * This is not an issue on UN*X.
1293 * See the mail threads starting at
1295 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1299 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1302 #define xx_free free /* hack so checkAPIs doesn't complain */
1305 #endif /* HAVE_PCAP_FREE_DATALINKS */
1306 #else /* HAVE_PCAP_LIST_DATALINKS */
1308 data_link_info = create_data_link_info(deflt);
1309 caps->data_link_types = g_list_append(caps->data_link_types,
1311 #endif /* HAVE_PCAP_LIST_DATALINKS */
1315 if (err_str != NULL)
1320 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1322 * Output a machine readable list of the interfaces
1323 * This list is retrieved by the sync_interface_list_open() function
1324 * The actual output of this function can be viewed with the command "dumpcap -D -Z none"
1327 print_machine_readable_interfaces(GList *if_list)
1334 char addr_str[ADDRSTRLEN];
1336 if (capture_child) {
1337 /* Let our parent know we succeeded. */
1338 pipe_write_block(2, SP_SUCCESS, NULL);
1341 i = 1; /* Interface id number */
1342 for (if_entry = g_list_first(if_list); if_entry != NULL;
1343 if_entry = g_list_next(if_entry)) {
1344 if_info = (if_info_t *)if_entry->data;
1345 printf("%d. %s\t", i++, if_info->name);
1348 * Print the contents of the if_entry struct in a parseable format.
1349 * Each if_entry element is tab-separated. Addresses are comma-
1352 /* XXX - Make sure our description doesn't contain a tab */
1353 if (if_info->vendor_description != NULL)
1354 printf("%s\t", if_info->vendor_description);
1358 /* XXX - Make sure our friendly name doesn't contain a tab */
1359 if (if_info->friendly_name != NULL)
1360 printf("%s\t", if_info->friendly_name);
1364 printf("%u\t", if_info->type);
1366 for (addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1367 addr = g_slist_next(addr)) {
1368 if (addr != g_slist_nth(if_info->addrs, 0))
1371 if_addr = (if_addr_t *)addr->data;
1372 switch(if_addr->ifat_type) {
1374 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1376 printf("%s", addr_str);
1378 printf("<unknown IPv4>");
1382 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1383 addr_str, ADDRSTRLEN)) {
1384 printf("%s", addr_str);
1386 printf("<unknown IPv6>");
1390 printf("<type unknown %u>", if_addr->ifat_type);
1394 if (if_info->loopback)
1395 printf("\tloopback");
1397 printf("\tnetwork");
1404 * If you change the machine-readable output format of this function,
1405 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1408 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1411 data_link_info_t *data_link_info;
1412 const gchar *desc_str;
1414 if (capture_child) {
1415 /* Let our parent know we succeeded. */
1416 pipe_write_block(2, SP_SUCCESS, NULL);
1419 if (caps->can_set_rfmon)
1423 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1424 lt_entry = g_list_next(lt_entry)) {
1425 data_link_info = (data_link_info_t *)lt_entry->data;
1426 if (data_link_info->description != NULL)
1427 desc_str = data_link_info->description;
1429 desc_str = "(not supported)";
1430 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1440 /* Print the number of packets captured for each interface until we're killed. */
1442 print_statistics_loop(gboolean machine_readable)
1444 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1450 char errbuf[PCAP_ERRBUF_SIZE];
1451 struct pcap_stat ps;
1453 if_list = get_interface_list(&err, &err_str);
1454 if (if_list == NULL) {
1456 case CANT_GET_INTERFACE_LIST:
1457 case DONT_HAVE_PCAP:
1458 cmdarg_err("%s", err_str);
1462 case NO_INTERFACES_FOUND:
1463 cmdarg_err("There are no interfaces on which a capture can be done");
1469 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1470 if_info = (if_info_t *)if_entry->data;
1471 #ifdef HAVE_PCAP_OPEN
1472 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1474 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1478 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1479 if_stat->name = g_strdup(if_info->name);
1481 stat_list = g_list_append(stat_list, if_stat);
1486 cmdarg_err("There are no interfaces on which a capture can be done");
1490 if (capture_child) {
1491 /* Let our parent know we succeeded. */
1492 pipe_write_block(2, SP_SUCCESS, NULL);
1495 if (!machine_readable) {
1496 printf("%-15s %10s %10s\n", "Interface", "Received",
1500 global_ld.go = TRUE;
1501 while (global_ld.go) {
1502 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1503 if_stat = (if_stat_t *)stat_entry->data;
1504 pcap_stats(if_stat->pch, &ps);
1506 if (!machine_readable) {
1507 printf("%-15s %10u %10u\n", if_stat->name,
1508 ps.ps_recv, ps.ps_drop);
1510 printf("%s\t%u\t%u\n", if_stat->name,
1511 ps.ps_recv, ps.ps_drop);
1516 /* If we have a dummy signal pipe check it */
1517 if (!signal_pipe_check_running()) {
1518 global_ld.go = FALSE;
1526 /* XXX - Not reached. Should we look for 'q' in stdin? */
1527 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1528 if_stat = (if_stat_t *)stat_entry->data;
1529 pcap_close(if_stat->pch);
1530 g_free(if_stat->name);
1533 g_list_free(stat_list);
1534 free_interface_list(if_list);
1542 capture_cleanup_handler(DWORD dwCtrlType)
1544 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1545 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1546 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1547 like SIGTERM at least when the machine's shutting down.
1549 For now, if we're running as a command rather than a capture child,
1550 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1551 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1552 in that way on UN*X.
1554 If we're not running as a capture child, we might be running as
1555 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1556 user logs out. (XXX - can we explicitly check whether we're
1557 running as a service?) */
1559 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1560 "Console: Control signal");
1561 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1562 "Console: Control signal, CtrlType: %u", dwCtrlType);
1564 /* Keep capture running if we're a service and a user logs off */
1565 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1566 capture_loop_stop();
1574 capture_cleanup_handler(int signum _U_)
1576 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1577 SIGTERM. We assume that if the user wanted it to keep running
1578 after they logged out, they'd have nohupped it. */
1580 /* Note: don't call g_log() in the signal handler: if we happened to be in
1581 * g_log() in process context when the signal came in, g_log will detect
1582 * the "recursion" and abort.
1585 capture_loop_stop();
1591 report_capture_count(gboolean reportit)
1593 /* Don't print this if we're a capture child. */
1594 if (!capture_child && reportit) {
1595 fprintf(stderr, "\rPackets captured: %u\n", global_ld.packet_count);
1596 /* stderr could be line buffered */
1604 report_counts_for_siginfo(void)
1606 report_capture_count(quiet);
1607 infoprint = FALSE; /* we just reported it */
1611 report_counts_siginfo(int signum _U_)
1613 int sav_errno = errno;
1615 /* If we've been told to delay printing, just set a flag asking
1616 that we print counts (if we're supposed to), otherwise print
1617 the count of packets captured (if we're supposed to). */
1621 report_counts_for_siginfo();
1624 #endif /* SIGINFO */
1627 exit_main(int status)
1630 /* Shutdown windows sockets */
1633 /* can be helpful for debugging */
1634 #ifdef DEBUG_DUMPCAP
1635 printf("Press any key\n");
1646 * If we were linked with libcap (not related to libpcap), make sure we have
1647 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1648 * (See comment in main() for details)
1651 relinquish_privs_except_capture(void)
1653 /* If 'started_with_special_privs' (ie: suid) then enable for
1654 * ourself the NET_ADMIN and NET_RAW capabilities and then
1655 * drop our suid privileges.
1657 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1658 * stuff we don't need (and shouldn't have).
1659 * CAP_NET_RAW: Packet capture (raw sockets).
1662 if (started_with_special_privs()) {
1663 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1664 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1666 cap_t caps = cap_init(); /* all capabilities initialized to off */
1668 print_caps("Pre drop, pre set");
1670 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1671 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1674 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1675 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1677 if (cap_set_proc(caps)) {
1678 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1680 print_caps("Pre drop, post set");
1682 relinquish_special_privs_perm();
1684 print_caps("Post drop, pre set");
1685 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1686 if (cap_set_proc(caps)) {
1687 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1689 print_caps("Post drop, post set");
1695 #endif /* HAVE_LIBCAP */
1697 /* Take care of byte order in the libpcap headers read from pipes.
1698 * (function taken from wiretap/libpcap.c) */
1700 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1703 /* Byte-swap the record header fields. */
1704 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1705 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1706 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1707 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1710 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1711 swapped, in order to match the BPF header layout.
1713 Unfortunately, some files were, according to a comment in the "libpcap"
1714 source, written with version 2.3 in their headers but without the
1715 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1716 would make no sense - we assume that we need to swap them. */
1717 if (hdr->version_major == 2 &&
1718 (hdr->version_minor < 3 ||
1719 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1722 temp = rechdr->orig_len;
1723 rechdr->orig_len = rechdr->incl_len;
1724 rechdr->incl_len = temp;
1728 /* Wrapper: distinguish between recv/read if we're reading on Windows,
1732 cap_pipe_read(int pipe_fd, char *buf, size_t sz, gboolean from_socket _U_)
1736 return recv(pipe_fd, buf, (int)sz, 0);
1741 return ws_read(pipe_fd, buf, sz);
1747 * Thread function that reads from a pipe and pushes the data
1748 * to the main application thread.
1751 * XXX Right now we use async queues for basic signaling. The main thread
1752 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1753 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1754 * Iff the read is successful cap_pipe_read pushes an item onto
1755 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1756 * the queues themselves (yet).
1758 * We might want to move some of the cap_pipe_dispatch logic here so that
1759 * we can let cap_thread_read run independently, queuing up multiple reads
1760 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1762 static void *cap_thread_read(void *arg)
1764 pcap_options *pcap_opts;
1767 DWORD b, last_err, bytes_read;
1773 pcap_opts = (pcap_options *)arg;
1774 while (pcap_opts->cap_pipe_err == PIPOK) {
1775 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1776 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1778 while (bytes_read < pcap_opts->cap_pipe_bytes_to_read) {
1779 if ((pcap_opts->from_cap_socket)
1785 b = cap_pipe_read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1786 pcap_opts->cap_pipe_bytes_to_read - bytes_read, pcap_opts->from_cap_socket);
1789 pcap_opts->cap_pipe_err = PIPEOF;
1793 pcap_opts->cap_pipe_err = PIPERR;
1804 /* If we try to use read() on a named pipe on Windows with partial
1805 * data it appears to return EOF.
1807 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1808 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1813 last_err = GetLastError();
1814 if (last_err == ERROR_MORE_DATA) {
1816 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1817 pcap_opts->cap_pipe_err = PIPEOF;
1821 pcap_opts->cap_pipe_err = PIPERR;
1824 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1825 pcap_opts->cap_pipe_err = PIPEOF;
1832 pcap_opts->cap_pipe_bytes_read = bytes_read;
1833 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1834 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1836 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1842 /* Provide select() functionality for a single file descriptor
1843 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1845 * Returns the same values as select.
1848 cap_pipe_select(int pipe_fd)
1851 struct timeval timeout;
1854 FD_SET(pipe_fd, &rfds);
1856 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1857 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1859 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1862 #define DEF_TCP_PORT 19000
1865 cap_open_socket(char *pipename, pcap_options *pcap_opts, char *errmsg, int errmsgl)
1867 char *sockname = pipename + 4;
1868 struct sockaddr_in sa;
1875 memset(&sa, 0, sizeof(sa));
1877 p = strchr(sockname, ':');
1879 len = strlen(sockname);
1880 port = DEF_TCP_PORT;
1884 port = strtoul(p + 1, &p, 10);
1885 if (*p || port > 65535) {
1894 strncpy(buf, sockname, len);
1896 if (inet_pton(AF_INET, buf, &sa.sin_addr) <= 0) {
1900 sa.sin_family = AF_INET;
1901 sa.sin_port = htons((u_short)port);
1903 if (((fd = (int)socket(AF_INET, SOCK_STREAM, 0)) < 0) ||
1904 (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)) {
1906 LPTSTR errorText = NULL;
1909 lastError = WSAGetLastError();
1910 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
1911 FORMAT_MESSAGE_ALLOCATE_BUFFER |
1912 FORMAT_MESSAGE_IGNORE_INSERTS,
1913 NULL, lastError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
1914 (LPTSTR)&errorText, 0, NULL);
1916 g_snprintf(errmsg, errmsgl,
1917 "The capture session could not be initiated due to the socket error: \n"
1919 " %d: %S", lastError, errorText ? (char *)errorText : "Unknown");
1921 LocalFree(errorText);
1923 " %d: %s", errno, strerror(errno));
1925 pcap_opts->cap_pipe_err = PIPERR;
1928 cap_pipe_close(fd, TRUE);
1932 pcap_opts->from_cap_socket = TRUE;
1936 g_snprintf(errmsg, errmsgl,
1937 "The capture session could not be initiated because\n"
1938 "\"%s\" is not a valid socket specification", pipename);
1939 pcap_opts->cap_pipe_err = PIPERR;
1943 /* Wrapper: distinguish between closesocket on Windows; use ws_close
1947 cap_pipe_close(int pipe_fd, gboolean from_socket _U_)
1951 closesocket(pipe_fd);
1958 /* Mimic pcap_open_live() for pipe captures
1960 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1961 * open it, and read the header.
1963 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1964 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1966 cap_pipe_open_live(char *pipename,
1967 pcap_options *pcap_opts,
1968 struct pcap_hdr *hdr,
1969 char *errmsg, int errmsgl)
1972 ws_statb64 pipe_stat;
1973 struct sockaddr_un sa;
1983 pcap_opts->cap_pipe_fd = -1;
1985 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1987 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1990 * XXX - this blocks until a pcap per-file header has been written to
1991 * the pipe, so it could block indefinitely.
1993 if (strcmp(pipename, "-") == 0) {
1995 fd = 0; /* read from stdin */
1997 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1999 } else if (!strncmp(pipename, "TCP@", 4)) {
2000 if ((fd = cap_open_socket(pipename, pcap_opts, errmsg, errmsgl)) < 0) {
2005 if (ws_stat64(pipename, &pipe_stat) < 0) {
2006 if (errno == ENOENT || errno == ENOTDIR)
2007 pcap_opts->cap_pipe_err = PIPNEXIST;
2009 g_snprintf(errmsg, errmsgl,
2010 "The capture session could not be initiated "
2011 "due to error getting information on pipe/socket: %s", g_strerror(errno));
2012 pcap_opts->cap_pipe_err = PIPERR;
2016 if (S_ISFIFO(pipe_stat.st_mode)) {
2017 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
2019 g_snprintf(errmsg, errmsgl,
2020 "The capture session could not be initiated "
2021 "due to error on pipe open: %s", g_strerror(errno));
2022 pcap_opts->cap_pipe_err = PIPERR;
2025 } else if (S_ISSOCK(pipe_stat.st_mode)) {
2026 fd = socket(AF_UNIX, SOCK_STREAM, 0);
2028 g_snprintf(errmsg, errmsgl,
2029 "The capture session could not be initiated "
2030 "due to error on socket create: %s", g_strerror(errno));
2031 pcap_opts->cap_pipe_err = PIPERR;
2034 sa.sun_family = AF_UNIX;
2036 * The Single UNIX Specification says:
2038 * The size of sun_path has intentionally been left undefined.
2039 * This is because different implementations use different sizes.
2040 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
2041 * of 104. Since most implementations originate from BSD versions,
2042 * the size is typically in the range 92 to 108.
2044 * Applications should not assume a particular length for sun_path
2045 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
2049 * The <sys/un.h> header shall define the sockaddr_un structure,
2050 * which shall include at least the following members:
2052 * sa_family_t sun_family Address family.
2053 * char sun_path[] Socket pathname.
2055 * so we assume that it's an array, with a specified size,
2056 * and that the size reflects the maximum path length.
2058 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
2059 /* Path name too long */
2060 g_snprintf(errmsg, errmsgl,
2061 "The capture session coud not be initiated "
2062 "due to error on socket connect: Path name too long");
2063 pcap_opts->cap_pipe_err = PIPERR;
2067 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
2069 g_snprintf(errmsg, errmsgl,
2070 "The capture session coud not be initiated "
2071 "due to error on socket connect: %s", g_strerror(errno));
2072 pcap_opts->cap_pipe_err = PIPERR;
2077 if (S_ISCHR(pipe_stat.st_mode)) {
2079 * Assume the user specified an interface on a system where
2080 * interfaces are in /dev. Pretend we haven't seen it.
2082 pcap_opts->cap_pipe_err = PIPNEXIST;
2084 g_snprintf(errmsg, errmsgl,
2085 "The capture session could not be initiated because\n"
2086 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
2087 pcap_opts->cap_pipe_err = PIPERR;
2092 #define PIPE_STR "\\pipe\\"
2093 /* Under Windows, named pipes _must_ have the form
2094 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
2096 pncopy = g_strdup(pipename);
2097 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
2098 pos = strchr(pncopy + 3, '\\');
2099 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
2106 g_snprintf(errmsg, errmsgl,
2107 "The capture session could not be initiated because\n"
2108 "\"%s\" is neither an interface nor a pipe", pipename);
2109 pcap_opts->cap_pipe_err = PIPNEXIST;
2113 /* Wait for the pipe to appear */
2115 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
2116 OPEN_EXISTING, 0, NULL);
2118 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
2121 if (GetLastError() != ERROR_PIPE_BUSY) {
2122 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
2123 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2124 g_snprintf(errmsg, errmsgl,
2125 "The capture session on \"%s\" could not be started "
2126 "due to error on pipe open: %s (error %d)",
2127 pipename, utf_16to8(err_str), GetLastError());
2129 pcap_opts->cap_pipe_err = PIPERR;
2133 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
2134 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
2135 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2136 g_snprintf(errmsg, errmsgl,
2137 "The capture session on \"%s\" timed out during "
2138 "pipe open: %s (error %d)",
2139 pipename, utf_16to8(err_str), GetLastError());
2141 pcap_opts->cap_pipe_err = PIPERR;
2148 pcap_opts->from_cap_pipe = TRUE;
2151 if (pcap_opts->from_cap_socket)
2154 /* read the pcap header */
2156 while (bytes_read < sizeof magic) {
2157 sel_ret = cap_pipe_select(fd);
2159 g_snprintf(errmsg, errmsgl,
2160 "Unexpected error from select: %s", g_strerror(errno));
2162 } else if (sel_ret > 0) {
2163 b = cap_pipe_read(fd, ((char *)&magic)+bytes_read,
2164 sizeof magic-bytes_read,
2165 pcap_opts->from_cap_socket);
2168 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
2170 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
2180 #if GLIB_CHECK_VERSION(2,31,0)
2181 g_thread_new("cap_pipe_open_live", &cap_thread_read, pcap_opts);
2183 g_thread_create(&cap_thread_read, pcap_opts, FALSE, NULL);
2186 pcap_opts->cap_pipe_buf = (char *) &magic;
2187 pcap_opts->cap_pipe_bytes_read = 0;
2188 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
2189 /* We don't have to worry about cap_pipe_read_mtx here */
2190 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2191 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
2192 if (pcap_opts->cap_pipe_bytes_read <= 0) {
2193 if (pcap_opts->cap_pipe_bytes_read == 0)
2194 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
2196 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
2205 case PCAP_NSEC_MAGIC:
2206 /* Host that wrote it has our byte order, and was running
2207 a program using either standard or ss990417 libpcap. */
2208 pcap_opts->cap_pipe_byte_swapped = FALSE;
2209 pcap_opts->cap_pipe_modified = FALSE;
2210 pcap_opts->ts_nsec = magic == PCAP_NSEC_MAGIC;
2212 case PCAP_MODIFIED_MAGIC:
2213 /* Host that wrote it has our byte order, but was running
2214 a program using either ss990915 or ss991029 libpcap. */
2215 pcap_opts->cap_pipe_byte_swapped = FALSE;
2216 pcap_opts->cap_pipe_modified = TRUE;
2218 case PCAP_SWAPPED_MAGIC:
2219 case PCAP_SWAPPED_NSEC_MAGIC:
2220 /* Host that wrote it has a byte order opposite to ours,
2221 and was running a program using either standard or
2222 ss990417 libpcap. */
2223 pcap_opts->cap_pipe_byte_swapped = TRUE;
2224 pcap_opts->cap_pipe_modified = FALSE;
2225 pcap_opts->ts_nsec = magic == PCAP_SWAPPED_NSEC_MAGIC;
2227 case PCAP_SWAPPED_MODIFIED_MAGIC:
2228 /* Host that wrote it out has a byte order opposite to
2229 ours, and was running a program using either ss990915
2230 or ss991029 libpcap. */
2231 pcap_opts->cap_pipe_byte_swapped = TRUE;
2232 pcap_opts->cap_pipe_modified = TRUE;
2235 /* Not a "libpcap" type we know about. */
2236 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
2241 if (pcap_opts->from_cap_socket)
2244 /* Read the rest of the header */
2246 while (bytes_read < sizeof(struct pcap_hdr)) {
2247 sel_ret = cap_pipe_select(fd);
2249 g_snprintf(errmsg, errmsgl,
2250 "Unexpected error from select: %s", g_strerror(errno));
2252 } else if (sel_ret > 0) {
2253 b = cap_pipe_read(fd, ((char *)hdr)+bytes_read,
2254 sizeof(struct pcap_hdr) - bytes_read,
2255 pcap_opts->from_cap_socket);
2258 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
2260 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
2270 pcap_opts->cap_pipe_buf = (char *) hdr;
2271 pcap_opts->cap_pipe_bytes_read = 0;
2272 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
2273 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2274 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
2275 if (pcap_opts->cap_pipe_bytes_read <= 0) {
2276 if (pcap_opts->cap_pipe_bytes_read == 0)
2277 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
2279 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
2286 if (pcap_opts->cap_pipe_byte_swapped) {
2287 /* Byte-swap the header fields about which we care. */
2288 hdr->version_major = BSWAP16(hdr->version_major);
2289 hdr->version_minor = BSWAP16(hdr->version_minor);
2290 hdr->snaplen = BSWAP32(hdr->snaplen);
2291 hdr->network = BSWAP32(hdr->network);
2293 pcap_opts->linktype = hdr->network;
2295 if (hdr->version_major < 2) {
2296 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
2300 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2301 pcap_opts->cap_pipe_err = PIPOK;
2302 pcap_opts->cap_pipe_fd = fd;
2306 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
2307 pcap_opts->cap_pipe_err = PIPERR;
2308 cap_pipe_close(fd, pcap_opts->from_cap_socket);
2309 pcap_opts->cap_pipe_fd = -1;
2313 /* We read one record from the pipe, take care of byte order in the record
2314 * header, write the record to the capture file, and update capture statistics. */
2316 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
2318 struct pcap_pkthdr phdr;
2319 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2322 #if !GLIB_CHECK_VERSION(2,31,18)
2330 #ifdef LOG_CAPTURE_VERBOSE
2331 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2334 switch (pcap_opts->cap_pipe_state) {
2336 case STATE_EXPECT_REC_HDR:
2338 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2341 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2342 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2343 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2344 pcap_opts->cap_pipe_bytes_read = 0;
2347 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2348 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2349 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2354 case STATE_READ_REC_HDR:
2356 if (pcap_opts->from_cap_socket)
2359 b = cap_pipe_read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2360 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read, pcap_opts->from_cap_socket);
2363 result = PD_PIPE_EOF;
2365 result = PD_PIPE_ERR;
2368 pcap_opts->cap_pipe_bytes_read += b;
2372 #if GLIB_CHECK_VERSION(2,31,18)
2373 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
2375 g_get_current_time(&wait_time);
2376 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2377 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2379 if (pcap_opts->cap_pipe_err == PIPEOF) {
2380 result = PD_PIPE_EOF;
2382 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2383 result = PD_PIPE_ERR;
2391 if (pcap_opts->cap_pipe_bytes_read < pcap_opts->cap_pipe_bytes_to_read)
2393 result = PD_REC_HDR_READ;
2396 case STATE_EXPECT_DATA:
2398 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2401 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2402 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2403 pcap_opts->cap_pipe_bytes_read = 0;
2406 pcap_opts->cap_pipe_buf = (char *) data;
2407 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2408 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2413 case STATE_READ_DATA:
2415 if (pcap_opts->from_cap_socket)
2418 b = cap_pipe_read(pcap_opts->cap_pipe_fd,
2419 data+pcap_opts->cap_pipe_bytes_read,
2420 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read,
2421 pcap_opts->from_cap_socket);
2424 result = PD_PIPE_EOF;
2426 result = PD_PIPE_ERR;
2429 pcap_opts->cap_pipe_bytes_read += b;
2434 #if GLIB_CHECK_VERSION(2,31,18)
2435 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
2437 g_get_current_time(&wait_time);
2438 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2439 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2440 #endif /* GLIB_CHECK_VERSION(2,31,18) */
2441 if (pcap_opts->cap_pipe_err == PIPEOF) {
2442 result = PD_PIPE_EOF;
2444 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2445 result = PD_PIPE_ERR;
2453 if (pcap_opts->cap_pipe_bytes_read < pcap_opts->cap_pipe_bytes_to_read)
2455 result = PD_DATA_READ;
2459 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2462 } /* switch (pcap_opts->cap_pipe_state) */
2465 * We've now read as much data as we were expecting, so process it.
2469 case PD_REC_HDR_READ:
2470 /* We've read the header. Take care of byte order. */
2471 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2472 &pcap_opts->cap_pipe_rechdr.hdr);
2473 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2474 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2475 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2479 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2480 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2483 /* no data to read? fall through */
2486 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2487 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2488 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2489 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2490 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2493 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2495 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2497 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2501 pcap_opts->cap_pipe_err = PIPEOF;
2506 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
2507 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2508 g_snprintf(errmsg, errmsgl,
2509 "Error reading from pipe: %s (error %d)",
2510 utf_16to8(err_str), GetLastError());
2513 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2521 pcap_opts->cap_pipe_err = PIPERR;
2522 /* Return here rather than inside the switch to prevent GCC warning */
2527 /** Open the capture input file (pcap or capture pipe).
2528 * Returns TRUE if it succeeds, FALSE otherwise. */
2530 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2531 char *errmsg, size_t errmsg_len,
2532 char *secondary_errmsg, size_t secondary_errmsg_len)
2534 gchar open_err_str[PCAP_ERRBUF_SIZE];
2535 gchar *sync_msg_str;
2536 interface_options interface_opts;
2537 pcap_options *pcap_opts;
2541 gchar *sync_secondary_msg_str;
2542 WORD wVersionRequested;
2546 /* XXX - opening Winsock on tshark? */
2548 /* Initialize Windows Socket if we are in a WIN32 OS
2549 This needs to be done before querying the interface for network/netmask */
2551 /* XXX - do we really require 1.1 or earlier?
2552 Are there any versions that support only 2.0 or higher? */
2553 wVersionRequested = MAKEWORD(1, 1);
2554 err = WSAStartup(wVersionRequested, &wsaData);
2558 case WSASYSNOTREADY:
2559 g_snprintf(errmsg, (gulong) errmsg_len,
2560 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2563 case WSAVERNOTSUPPORTED:
2564 g_snprintf(errmsg, (gulong) errmsg_len,
2565 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2566 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2569 case WSAEINPROGRESS:
2570 g_snprintf(errmsg, (gulong) errmsg_len,
2571 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2575 g_snprintf(errmsg, (gulong) errmsg_len,
2576 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2580 g_snprintf(errmsg, (gulong) errmsg_len,
2581 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2585 g_snprintf(errmsg, (gulong) errmsg_len,
2586 "Couldn't initialize Windows Sockets: error %d", err);
2589 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2593 if ((use_threads == FALSE) &&
2594 (capture_opts->ifaces->len > 1)) {
2595 g_snprintf(errmsg, (gulong) errmsg_len,
2596 "Using threads is required for capturing on multiple interfaces!");
2600 for (i = 0; i < capture_opts->ifaces->len; i++) {
2601 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2602 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2603 if (pcap_opts == NULL) {
2604 g_snprintf(errmsg, (gulong) errmsg_len,
2605 "Could not allocate memory.");
2608 pcap_opts->received = 0;
2609 pcap_opts->dropped = 0;
2610 pcap_opts->flushed = 0;
2611 pcap_opts->pcap_h = NULL;
2612 #ifdef MUST_DO_SELECT
2613 pcap_opts->pcap_fd = -1;
2615 pcap_opts->pcap_err = FALSE;
2616 pcap_opts->interface_id = i;
2617 pcap_opts->tid = NULL;
2618 pcap_opts->snaplen = 0;
2619 pcap_opts->linktype = -1;
2620 pcap_opts->ts_nsec = FALSE;
2621 pcap_opts->from_cap_pipe = FALSE;
2622 pcap_opts->from_cap_socket = FALSE;
2623 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2624 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2626 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2628 pcap_opts->cap_pipe_fd = -1;
2629 pcap_opts->cap_pipe_modified = FALSE;
2630 pcap_opts->cap_pipe_byte_swapped = FALSE;
2632 pcap_opts->cap_pipe_buf = NULL;
2634 pcap_opts->cap_pipe_bytes_to_read = 0;
2635 pcap_opts->cap_pipe_bytes_read = 0;
2636 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2637 pcap_opts->cap_pipe_err = PIPOK;
2639 #if GLIB_CHECK_VERSION(2,31,0)
2640 pcap_opts->cap_pipe_read_mtx = g_malloc(sizeof(GMutex));
2641 g_mutex_init(pcap_opts->cap_pipe_read_mtx);
2643 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2645 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2646 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2648 g_array_append_val(ld->pcaps, pcap_opts);
2650 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2651 pcap_opts->pcap_h = open_capture_device(&interface_opts, &open_err_str);
2653 if (pcap_opts->pcap_h != NULL) {
2654 /* we've opened "iface" as a network device */
2656 /* try to set the capture buffer size */
2657 if (interface_opts.buffer_size > 1 &&
2658 pcap_setbuff(pcap_opts->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2659 sync_secondary_msg_str = g_strdup_printf(
2660 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2661 "the default of 1MB will be used.\n"
2663 "Nonetheless, the capture is started.\n",
2664 interface_opts.buffer_size);
2665 report_capture_error("Couldn't set the capture buffer size!",
2666 sync_secondary_msg_str);
2667 g_free(sync_secondary_msg_str);
2671 #if defined(HAVE_PCAP_SETSAMPLING)
2672 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2673 struct pcap_samp *samp;
2675 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2676 switch (interface_opts.sampling_method) {
2677 case CAPTURE_SAMP_BY_COUNT:
2678 samp->method = PCAP_SAMP_1_EVERY_N;
2681 case CAPTURE_SAMP_BY_TIMER:
2682 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2686 sync_msg_str = g_strdup_printf(
2687 "Unknown sampling method %d specified,\n"
2688 "continue without packet sampling",
2689 interface_opts.sampling_method);
2690 report_capture_error("Couldn't set the capture "
2691 "sampling", sync_msg_str);
2692 g_free(sync_msg_str);
2694 samp->value = interface_opts.sampling_param;
2696 report_capture_error("Couldn't set the capture sampling",
2697 "Cannot get packet sampling data structure");
2702 /* setting the data link type only works on real interfaces */
2703 if (!set_pcap_linktype(pcap_opts->pcap_h, interface_opts.linktype, interface_opts.name,
2705 secondary_errmsg, secondary_errmsg_len)) {
2708 pcap_opts->linktype = get_pcap_linktype(pcap_opts->pcap_h, interface_opts.name);
2710 /* We couldn't open "iface" as a network device. */
2711 /* Try to open it as a pipe */
2712 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2715 if (pcap_opts->cap_pipe_fd == -1) {
2717 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2719 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2720 /* Pipe doesn't exist, so output message for interface */
2721 get_capture_device_open_failure_messages(open_err_str,
2722 interface_opts.name,
2726 secondary_errmsg_len);
2729 * Else pipe (or file) does exist and cap_pipe_open_live() has
2734 /* cap_pipe_open_live() succeeded; don't want
2735 error message from pcap_open_live() */
2736 open_err_str[0] = '\0';
2740 /* XXX - will this work for tshark? */
2741 #ifdef MUST_DO_SELECT
2742 if (!pcap_opts->from_cap_pipe) {
2743 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2744 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2746 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2751 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2752 returned a warning; print it, but keep capturing. */
2753 if (open_err_str[0] != '\0') {
2754 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2755 report_capture_error(sync_msg_str, "");
2756 g_free(sync_msg_str);
2758 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2759 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2762 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2763 /* to remove any suid privileges. */
2764 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2765 /* (euid/egid have already previously been set to ruid/rgid. */
2766 /* (See comment in main() for details) */
2768 relinquish_special_privs_perm();
2770 relinquish_all_capabilities();
2775 /* close the capture input file (pcap or capture pipe) */
2776 static void capture_loop_close_input(loop_data *ld)
2779 pcap_options *pcap_opts;
2781 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2783 for (i = 0; i < ld->pcaps->len; i++) {
2784 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2785 /* if open, close the capture pipe "input file" */
2786 if (pcap_opts->cap_pipe_fd >= 0) {
2787 g_assert(pcap_opts->from_cap_pipe);
2788 cap_pipe_close(pcap_opts->cap_pipe_fd, pcap_opts->from_cap_socket);
2789 pcap_opts->cap_pipe_fd = -1;
2792 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2793 CloseHandle(pcap_opts->cap_pipe_h);
2794 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2797 /* if open, close the pcap "input file" */
2798 if (pcap_opts->pcap_h != NULL) {
2799 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2800 pcap_close(pcap_opts->pcap_h);
2801 pcap_opts->pcap_h = NULL;
2808 /* Shut down windows sockets */
2814 /* init the capture filter */
2815 static initfilter_status_t
2816 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2817 const gchar * name, const gchar * cfilter)
2819 struct bpf_program fcode;
2821 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2823 /* capture filters only work on real interfaces */
2824 if (cfilter && !from_cap_pipe) {
2825 /* A capture filter was specified; set it up. */
2826 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2827 /* Treat this specially - our caller might try to compile this
2828 as a display filter and, if that succeeds, warn the user that
2829 the display and capture filter syntaxes are different. */
2830 return INITFILTER_BAD_FILTER;
2832 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2833 #ifdef HAVE_PCAP_FREECODE
2834 pcap_freecode(&fcode);
2836 return INITFILTER_OTHER_ERROR;
2838 #ifdef HAVE_PCAP_FREECODE
2839 pcap_freecode(&fcode);
2843 return INITFILTER_NO_ERROR;
2847 /* set up to write to the already-opened capture output file/files */
2849 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2853 pcap_options *pcap_opts;
2854 interface_options interface_opts;
2855 gboolean successful;
2857 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2859 if ((capture_opts->use_pcapng == FALSE) &&
2860 (capture_opts->ifaces->len > 1)) {
2861 g_snprintf(errmsg, errmsg_len,
2862 "Using PCAPNG is required for capturing on multiple interfaces! Use the -n option.");
2866 /* Set up to write to the capture file. */
2867 if (capture_opts->multi_files_on) {
2868 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2870 ld->pdh = ws_fdopen(ld->save_file_fd, "wb");
2871 if (ld->pdh == NULL) {
2876 if (capture_opts->use_pcapng) {
2878 GString *os_info_str;
2880 os_info_str = g_string_new("");
2881 get_os_version_info(os_info_str);
2883 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2884 successful = pcapng_write_session_header_block(ld->pdh,
2885 (const char *)capture_opts->capture_comment, /* Comment*/
2887 os_info_str->str, /* OS*/
2889 -1, /* section_length */
2893 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2894 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2895 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2896 if (pcap_opts->from_cap_pipe) {
2897 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2899 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2901 successful = pcapng_write_interface_description_block(global_ld.pdh,
2902 NULL, /* OPT_COMMENT 1 */
2903 interface_opts.name, /* IDB_NAME 2 */
2904 interface_opts.descr, /* IDB_DESCRIPTION 3 */
2905 interface_opts.cfilter, /* IDB_FILTER 11 */
2906 os_info_str->str, /* IDB_OS 12 */
2907 pcap_opts->linktype,
2909 &(global_ld.bytes_written),
2910 0, /* IDB_IF_SPEED 8 */
2911 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
2915 g_string_free(os_info_str, TRUE);
2918 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2919 if (pcap_opts->from_cap_pipe) {
2920 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2922 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2924 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2925 pcap_opts->ts_nsec, &ld->bytes_written, &err);
2933 if (ld->pdh == NULL) {
2934 /* We couldn't set up to write to the capture file. */
2935 /* XXX - use cf_open_error_message from tshark instead? */
2940 g_snprintf(errmsg, errmsg_len,
2941 "The file to which the capture would be"
2942 " saved (\"%s\") could not be opened: Error %d.",
2943 capture_opts->save_file, err);
2945 g_snprintf(errmsg, errmsg_len,
2946 "The file to which the capture would be"
2947 " saved (\"%s\") could not be opened: %s.",
2948 capture_opts->save_file, g_strerror(err));
2960 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2964 pcap_options *pcap_opts;
2965 guint64 end_time = create_timestamp();
2967 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2969 if (capture_opts->multi_files_on) {
2970 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2972 if (capture_opts->use_pcapng) {
2973 for (i = 0; i < global_ld.pcaps->len; i++) {
2974 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2975 if (!pcap_opts->from_cap_pipe) {
2976 guint64 isb_ifrecv, isb_ifdrop;
2977 struct pcap_stat stats;
2979 if (pcap_stats(pcap_opts->pcap_h, &stats) >= 0) {
2980 isb_ifrecv = pcap_opts->received;
2981 isb_ifdrop = stats.ps_drop + pcap_opts->dropped + pcap_opts->flushed;
2983 isb_ifrecv = G_MAXUINT64;
2984 isb_ifdrop = G_MAXUINT64;
2986 pcapng_write_interface_statistics_block(ld->pdh,
2989 "Counters provided by dumpcap",
2998 if (fclose(ld->pdh) == EOF) {
2999 if (err_close != NULL) {
3009 /* dispatch incoming packets (pcap or capture pipe)
3011 * Waits for incoming packets to be available, and calls pcap_dispatch()
3012 * to cause them to be processed.
3014 * Returns the number of packets which were processed.
3016 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
3017 * packet-batching behaviour does not cause packets to get held back
3021 capture_loop_dispatch(loop_data *ld,
3022 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
3025 gint packet_count_before;
3026 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
3031 packet_count_before = ld->packet_count;
3032 if (pcap_opts->from_cap_pipe) {
3033 /* dispatch from capture pipe */
3034 #ifdef LOG_CAPTURE_VERBOSE
3035 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
3038 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
3040 if (sel_ret < 0 && errno != EINTR) {
3041 g_snprintf(errmsg, errmsg_len,
3042 "Unexpected error from select: %s", g_strerror(errno));
3043 report_capture_error(errmsg, please_report);
3048 * "select()" says we can read from the pipe without blocking
3051 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
3061 /* dispatch from pcap */
3062 #ifdef MUST_DO_SELECT
3064 * If we have "pcap_get_selectable_fd()", we use it to get the
3065 * descriptor on which to select; if that's -1, it means there
3066 * is no descriptor on which you can do a "select()" (perhaps
3067 * because you're capturing on a special device, and that device's
3068 * driver unfortunately doesn't support "select()", in which case
3069 * we don't do the select - which means it might not be possible
3070 * to stop a capture until a packet arrives. If that's unacceptable,
3071 * plead with whoever supplies the software for that device to add
3072 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
3073 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
3074 * later, so it can use pcap_breakloop().
3076 #ifdef LOG_CAPTURE_VERBOSE
3077 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
3079 if (pcap_opts->pcap_fd != -1) {
3080 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
3083 * "select()" says we can read from it without blocking; go for
3086 * We don't have pcap_breakloop(), so we only process one packet
3087 * per pcap_dispatch() call, to allow a signal to stop the
3088 * processing immediately, rather than processing all packets
3089 * in a batch before quitting.
3092 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
3094 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
3098 /* Error, rather than pcap_breakloop(). */
3099 pcap_opts->pcap_err = TRUE;
3101 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
3104 if (sel_ret < 0 && errno != EINTR) {
3105 g_snprintf(errmsg, errmsg_len,
3106 "Unexpected error from select: %s", g_strerror(errno));
3107 report_capture_error(errmsg, please_report);
3113 #endif /* MUST_DO_SELECT */
3115 /* dispatch from pcap without select */
3117 #ifdef LOG_CAPTURE_VERBOSE
3118 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
3122 * On Windows, we don't support asynchronously telling a process to
3123 * stop capturing; instead, we check for an indication on a pipe
3124 * after processing packets. We therefore process only one packet
3125 * at a time, so that we can check the pipe after every packet.
3128 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
3130 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
3134 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
3136 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
3141 /* Error, rather than pcap_breakloop(). */
3142 pcap_opts->pcap_err = TRUE;
3144 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
3146 #else /* pcap_next_ex */
3147 #ifdef LOG_CAPTURE_VERBOSE
3148 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
3150 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
3153 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
3154 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
3155 * This should be fixed in the WinPcap 4.0 alpha release.
3157 * For reference, an example remote interface:
3158 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
3161 /* emulate dispatch from pcap */
3164 struct pcap_pkthdr *pkt_header;
3169 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
3171 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
3173 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
3178 pcap_opts->pcap_err = TRUE;
3182 #endif /* pcap_next_ex */
3186 #ifdef LOG_CAPTURE_VERBOSE
3187 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
3190 return ld->packet_count - packet_count_before;
3194 /* Isolate the Universally Unique Identifier from the interface. Basically, we
3195 * want to grab only the characters between the '{' and '}' delimiters.
3197 * Returns a GString that must be freed with g_string_free(). */
3199 isolate_uuid(const char *iface)
3204 ptr = strchr(iface, '{');
3206 return g_string_new(iface);
3207 gstr = g_string_new(ptr + 1);
3209 ptr = strchr(gstr->str, '}');
3213 gstr = g_string_truncate(gstr, ptr - gstr->str);
3218 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
3219 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
3221 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
3222 char *errmsg, int errmsg_len)
3225 gchar *capfile_name;
3227 gboolean is_tempfile;
3229 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
3230 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
3232 if (capture_opts->save_file != NULL) {
3233 /* We return to the caller while the capture is in progress.
3234 * Therefore we need to take a copy of save_file in
3235 * case the caller destroys it after we return.
3237 capfile_name = g_strdup(capture_opts->save_file);
3239 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
3240 if (capture_opts->multi_files_on) {
3241 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
3242 g_snprintf(errmsg, errmsg_len,
3243 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
3244 g_free(capfile_name);
3247 if (strcmp(capfile_name, "-") == 0) {
3248 /* write to stdout */
3251 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
3252 _setmode(1, O_BINARY);
3255 } /* if (...output_to_pipe ... */
3258 if (capture_opts->multi_files_on) {
3259 /* ringbuffer is enabled */
3260 *save_file_fd = ringbuf_init(capfile_name,
3261 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
3262 capture_opts->group_read_access);
3264 /* we need the ringbuf name */
3265 if (*save_file_fd != -1) {
3266 g_free(capfile_name);
3267 capfile_name = g_strdup(ringbuf_current_filename());
3270 /* Try to open/create the specified file for use as a capture buffer. */
3271 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
3272 (capture_opts->group_read_access) ? 0640 : 0600);
3275 is_tempfile = FALSE;
3277 /* Choose a random name for the temporary capture buffer */
3278 if (global_capture_opts.ifaces->len > 1) {
3279 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
3282 basename = g_path_get_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).console_display_name);
3284 /* use the generic portion of the interface guid to form the basis of the filename */
3285 if (strncmp("NPF_{", basename, 5)==0)
3287 /* we have a windows guid style device name, extract the guid digits as the basis of the filename */
3289 iface = isolate_uuid(basename);
3291 basename = g_strdup(iface->str);
3292 g_string_free(iface, TRUE);
3295 /* generate the temp file name prefix...
3296 * It would be nice if we could specify a pcapng/pcap filename suffix,
3297 * create_tempfile() however currently uses mkstemp() which doesn't allow this - one day perhaps*/
3298 if (capture_opts->use_pcapng) {
3299 prefix = g_strconcat("wireshark_pcapng_", basename, NULL);
3301 prefix = g_strconcat("wireshark_pcap_", basename, NULL);
3305 *save_file_fd = create_tempfile(&tmpname, prefix);
3307 capfile_name = g_strdup(tmpname);
3311 /* did we fail to open the output file? */
3312 if (*save_file_fd == -1) {
3314 g_snprintf(errmsg, errmsg_len,
3315 "The temporary file to which the capture would be saved (\"%s\") "
3316 "could not be opened: %s.", capfile_name, g_strerror(errno));
3318 if (capture_opts->multi_files_on) {
3319 ringbuf_error_cleanup();
3322 g_snprintf(errmsg, errmsg_len,
3323 "The file to which the capture would be saved (\"%s\") "
3324 "could not be opened: %s.", capfile_name,
3327 g_free(capfile_name);
3331 if (capture_opts->save_file != NULL) {
3332 g_free(capture_opts->save_file);
3334 capture_opts->save_file = capfile_name;
3335 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
3336 "g_free(capfile_name)". */
3342 /* Do the work of handling either the file size or file duration capture
3343 conditions being reached, and switching files or stopping. */
3345 do_file_switch_or_stop(capture_options *capture_opts,
3346 condition *cnd_autostop_files,
3347 condition *cnd_autostop_size,
3348 condition *cnd_file_duration)
3351 pcap_options *pcap_opts;
3352 interface_options interface_opts;
3353 gboolean successful;
3355 if (capture_opts->multi_files_on) {
3356 if (cnd_autostop_files != NULL &&
3357 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
3358 /* no files left: stop here */
3359 global_ld.go = FALSE;
3363 /* Switch to the next ringbuffer file */
3364 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
3365 &global_ld.save_file_fd, &global_ld.err)) {
3367 /* File switch succeeded: reset the conditions */
3368 global_ld.bytes_written = 0;
3369 if (capture_opts->use_pcapng) {
3371 GString *os_info_str;
3373 os_info_str = g_string_new("");
3374 get_os_version_info(os_info_str);
3376 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
3377 successful = pcapng_write_session_header_block(global_ld.pdh,
3380 os_info_str->str, /* OS */
3382 -1, /* section_length */
3383 &(global_ld.bytes_written),
3386 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
3387 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3388 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3389 successful = pcapng_write_interface_description_block(global_ld.pdh,
3390 NULL, /* OPT_COMMENT 1 */
3391 interface_opts.name, /* IDB_NAME 2 */
3392 interface_opts.descr, /* IDB_DESCRIPTION 3 */
3393 interface_opts.cfilter, /* IDB_FILTER 11 */
3394 os_info_str->str, /* IDB_OS 12 */
3395 pcap_opts->linktype,
3397 &(global_ld.bytes_written),
3398 0, /* IDB_IF_SPEED 8 */
3399 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
3403 g_string_free(os_info_str, TRUE);
3406 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3407 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
3408 pcap_opts->ts_nsec, &global_ld.bytes_written, &global_ld.err);
3411 fclose(global_ld.pdh);
3412 global_ld.pdh = NULL;
3413 global_ld.go = FALSE;
3416 if (cnd_autostop_size)
3417 cnd_reset(cnd_autostop_size);
3418 if (cnd_file_duration)
3419 cnd_reset(cnd_file_duration);
3420 fflush(global_ld.pdh);
3422 report_packet_count(global_ld.inpkts_to_sync_pipe);
3423 global_ld.inpkts_to_sync_pipe = 0;
3424 report_new_capture_file(capture_opts->save_file);
3426 /* File switch failed: stop here */
3427 global_ld.go = FALSE;
3431 /* single file, stop now */
3432 global_ld.go = FALSE;
3439 pcap_read_handler(void* arg)
3441 pcap_options *pcap_opts;
3442 char errmsg[MSG_MAX_LENGTH+1];
3444 pcap_opts = (pcap_options *)arg;
3446 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
3447 pcap_opts->interface_id);
3449 while (global_ld.go) {
3450 /* dispatch incoming packets */
3451 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
3453 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
3454 pcap_opts->interface_id);
3455 g_thread_exit(NULL);
3459 /* Do the low-level work of a capture.
3460 Returns TRUE if it succeeds, FALSE otherwise. */
3462 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3465 DWORD upd_time, cur_time; /* GetTickCount() returns a "DWORD" (which is 'unsigned long') */
3467 struct timeval upd_time, cur_time;
3471 condition *cnd_file_duration = NULL;
3472 condition *cnd_autostop_files = NULL;
3473 condition *cnd_autostop_size = NULL;
3474 condition *cnd_autostop_duration = NULL;
3477 gboolean cfilter_error = FALSE;
3478 char errmsg[MSG_MAX_LENGTH+1];
3479 char secondary_errmsg[MSG_MAX_LENGTH+1];
3480 pcap_options *pcap_opts;
3481 interface_options interface_opts;
3482 guint i, error_index = 0;
3485 *secondary_errmsg = '\0';
3487 /* init the loop data */
3488 global_ld.go = TRUE;
3489 global_ld.packet_count = 0;
3491 global_ld.report_packet_count = FALSE;
3493 if (capture_opts->has_autostop_packets)
3494 global_ld.packet_max = capture_opts->autostop_packets;
3496 global_ld.packet_max = 0; /* no limit */
3497 global_ld.inpkts_to_sync_pipe = 0;
3498 global_ld.err = 0; /* no error seen yet */
3499 global_ld.pdh = NULL;
3500 global_ld.autostop_files = 0;
3501 global_ld.save_file_fd = -1;
3503 /* We haven't yet gotten the capture statistics. */
3504 *stats_known = FALSE;
3506 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3507 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3509 /* open the "input file" from network interface or capture pipe */
3510 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3511 secondary_errmsg, sizeof(secondary_errmsg))) {
3514 for (i = 0; i < capture_opts->ifaces->len; i++) {
3515 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3516 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3517 /* init the input filter from the network interface (capture pipe will do nothing) */
3519 * When remote capturing WinPCap crashes when the capture filter
3520 * is NULL. This might be a bug in WPCap. Therefore we provide an empty
3523 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3524 interface_opts.name,
3525 interface_opts.cfilter?interface_opts.cfilter:"")) {
3527 case INITFILTER_NO_ERROR:
3530 case INITFILTER_BAD_FILTER:
3531 cfilter_error = TRUE;
3533 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3536 case INITFILTER_OTHER_ERROR:
3537 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3538 pcap_geterr(pcap_opts->pcap_h));
3539 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3544 /* If we're supposed to write to a capture file, open it for output
3545 (temporary/specified name/ringbuffer) */
3546 if (capture_opts->saving_to_file) {
3547 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3548 errmsg, sizeof(errmsg))) {
3552 /* set up to write to the already-opened capture output file/files */
3553 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3558 /* XXX - capture SIGTERM and close the capture, in case we're on a
3559 Linux 2.0[.x] system and you have to explicitly close the capture
3560 stream in order to turn promiscuous mode off? We need to do that
3561 in other places as well - and I don't think that works all the
3562 time in any case, due to libpcap bugs. */
3564 /* Well, we should be able to start capturing.
3566 Sync out the capture file, so the header makes it to the file system,
3567 and send a "capture started successfully and capture file created"
3568 message to our parent so that they'll open the capture file and
3569 update its windows to indicate that we have a live capture in
3571 fflush(global_ld.pdh);
3572 report_new_capture_file(capture_opts->save_file);
3575 /* initialize capture stop (and alike) conditions */
3576 init_capture_stop_conditions();
3577 /* create stop conditions */
3578 if (capture_opts->has_autostop_filesize) {
3579 if (capture_opts->autostop_filesize > (((guint32)INT_MAX + 1) / 1024)) {
3580 capture_opts->autostop_filesize = ((guint32)INT_MAX + 1) / 1024;
3583 cnd_new(CND_CLASS_CAPTURESIZE, (guint64)capture_opts->autostop_filesize * 1024);
3585 if (capture_opts->has_autostop_duration)
3586 cnd_autostop_duration =
3587 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3589 if (capture_opts->multi_files_on) {
3590 if (capture_opts->has_file_duration)
3592 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3594 if (capture_opts->has_autostop_files)
3595 cnd_autostop_files =
3596 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3599 /* init the time values */
3601 upd_time = GetTickCount();
3603 gettimeofday(&upd_time, NULL);
3605 start_time = create_timestamp();
3606 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3608 /* WOW, everything is prepared! */
3609 /* please fasten your seat belts, we will enter now the actual capture loop */
3611 pcap_queue = g_async_queue_new();
3612 pcap_queue_bytes = 0;
3613 pcap_queue_packets = 0;
3614 for (i = 0; i < global_ld.pcaps->len; i++) {
3615 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3616 #if GLIB_CHECK_VERSION(2,31,0)
3617 /* XXX - Add an interface name here? */
3618 pcap_opts->tid = g_thread_new("Capture read", pcap_read_handler, pcap_opts);
3620 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3624 while (global_ld.go) {
3625 /* dispatch incoming packets */
3627 pcap_queue_element *queue_element;
3628 #if GLIB_CHECK_VERSION(2,31,18)
3630 g_async_queue_lock(pcap_queue);
3631 queue_element = (pcap_queue_element *)g_async_queue_timeout_pop_unlocked(pcap_queue, WRITER_THREAD_TIMEOUT);
3633 GTimeVal write_thread_time;
3635 g_get_current_time(&write_thread_time);
3636 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3637 g_async_queue_lock(pcap_queue);
3638 queue_element = (pcap_queue_element *)g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3640 if (queue_element) {
3641 pcap_queue_bytes -= queue_element->phdr.caplen;
3642 pcap_queue_packets -= 1;
3644 g_async_queue_unlock(pcap_queue);
3645 if (queue_element) {
3646 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3647 "Dequeued a packet of length %d captured on interface %d.",
3648 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3650 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3651 &queue_element->phdr,
3653 g_free(queue_element->pd);
3654 g_free(queue_element);
3660 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3661 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3662 sizeof(errmsg), pcap_opts);
3665 /* Were we asked to print packet counts by the SIGINFO handler? */
3666 if (global_ld.report_packet_count) {
3667 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3668 plurality(global_ld.packet_count, "", "s"));
3669 global_ld.report_packet_count = FALSE;
3674 /* any news from our parent (signal pipe)? -> just stop the capture */
3675 if (!signal_pipe_check_running()) {
3676 global_ld.go = FALSE;
3681 global_ld.inpkts_to_sync_pipe += inpkts;
3683 /* check capture size condition */
3684 if (cnd_autostop_size != NULL &&
3685 cnd_eval(cnd_autostop_size, global_ld.bytes_written)) {
3686 /* Capture size limit reached, do we have another file? */
3687 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3688 cnd_autostop_size, cnd_file_duration))
3690 } /* cnd_autostop_size */
3691 if (capture_opts->output_to_pipe) {
3692 fflush(global_ld.pdh);
3696 /* Only update once every 500ms so as not to overload slow displays.
3697 * This also prevents too much context-switching between the dumpcap
3698 * and wireshark processes.
3700 #define DUMPCAP_UPD_TIME 500
3703 cur_time = GetTickCount(); /* Note: wraps to 0 if sys runs for 49.7 days */
3704 if ((cur_time - upd_time) > DUMPCAP_UPD_TIME) { /* wrap just causes an extra update */
3706 gettimeofday(&cur_time, NULL);
3707 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3708 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3711 upd_time = cur_time;
3714 if (pcap_stats(pch, stats) >= 0) {
3715 *stats_known = TRUE;
3718 /* Let the parent process know. */
3719 if (global_ld.inpkts_to_sync_pipe) {
3721 fflush(global_ld.pdh);
3723 /* Send our parent a message saying we've written out
3724 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3726 report_packet_count(global_ld.inpkts_to_sync_pipe);
3728 global_ld.inpkts_to_sync_pipe = 0;
3731 /* check capture duration condition */
3732 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3733 /* The maximum capture time has elapsed; stop the capture. */
3734 global_ld.go = FALSE;
3738 /* check capture file duration condition */
3739 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3740 /* duration limit reached, do we have another file? */
3741 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3742 cnd_autostop_size, cnd_file_duration))
3744 } /* cnd_file_duration */
3748 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3750 pcap_queue_element *queue_element;
3752 for (i = 0; i < global_ld.pcaps->len; i++) {
3753 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3754 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3755 pcap_opts->interface_id);
3756 g_thread_join(pcap_opts->tid);
3757 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3758 pcap_opts->interface_id);
3761 g_async_queue_lock(pcap_queue);
3762 queue_element = (pcap_queue_element *)g_async_queue_try_pop_unlocked(pcap_queue);
3763 if (queue_element) {
3764 pcap_queue_bytes -= queue_element->phdr.caplen;
3765 pcap_queue_packets -= 1;
3767 g_async_queue_unlock(pcap_queue);
3768 if (queue_element == NULL) {
3771 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3772 "Dequeued a packet of length %d captured on interface %d.",
3773 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3774 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3775 &queue_element->phdr,
3777 g_free(queue_element->pd);
3778 g_free(queue_element);
3779 global_ld.inpkts_to_sync_pipe += 1;
3780 if (capture_opts->output_to_pipe) {
3781 fflush(global_ld.pdh);
3787 /* delete stop conditions */
3788 if (cnd_file_duration != NULL)
3789 cnd_delete(cnd_file_duration);
3790 if (cnd_autostop_files != NULL)
3791 cnd_delete(cnd_autostop_files);
3792 if (cnd_autostop_size != NULL)
3793 cnd_delete(cnd_autostop_size);
3794 if (cnd_autostop_duration != NULL)
3795 cnd_delete(cnd_autostop_duration);
3797 /* did we have a pcap (input) error? */
3798 for (i = 0; i < capture_opts->ifaces->len; i++) {
3799 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3800 if (pcap_opts->pcap_err) {
3801 /* On Linux, if an interface goes down while you're capturing on it,
3802 you'll get a "recvfrom: Network is down" or
3803 "The interface went down" error (ENETDOWN).
3804 (At least you will if g_strerror() doesn't show a local translation
3807 On FreeBSD and OS X, if a network adapter disappears while
3808 you're capturing on it, you'll get a "read: Device not configured"
3809 error (ENXIO). (See previous parenthetical note.)
3811 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3813 These should *not* be reported to the Wireshark developers. */
3816 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3817 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3818 strcmp(cap_err_str, "The interface went down") == 0 ||
3819 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3820 strcmp(cap_err_str, "read: I/O error") == 0 ||
3821 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3822 report_capture_error("The network adapter on which the capture was being done "
3823 "is no longer running; the capture has stopped.",
3826 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3828 report_capture_error(errmsg, please_report);
3831 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3832 report_capture_error(errmsg, "");
3836 /* did we have an output error while capturing? */
3837 if (global_ld.err == 0) {
3840 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3841 global_ld.err, FALSE);
3842 report_capture_error(errmsg, please_report);
3846 if (capture_opts->saving_to_file) {
3847 /* close the output file */
3848 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3852 /* there might be packets not yet notified to the parent */
3853 /* (do this after closing the file, so all packets are already flushed) */
3854 if (global_ld.inpkts_to_sync_pipe) {
3856 report_packet_count(global_ld.inpkts_to_sync_pipe);
3857 global_ld.inpkts_to_sync_pipe = 0;
3860 /* If we've displayed a message about a write error, there's no point
3861 in displaying another message about an error on close. */
3862 if (!close_ok && write_ok) {
3863 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3865 report_capture_error(errmsg, "");
3869 * XXX We exhibit different behaviour between normal mode and sync mode
3870 * when the pipe is stdin and not already at EOF. If we're a child, the
3871 * parent's stdin isn't closed, so if the user starts another capture,
3872 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3873 * will say "Unrecognized libpcap format". On the other hand, in normal
3874 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3877 report_capture_count(TRUE);
3879 /* get packet drop statistics from pcap */
3880 for (i = 0; i < capture_opts->ifaces->len; i++) {
3882 guint32 pcap_dropped = 0;
3884 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3885 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3886 received = pcap_opts->received;
3887 if (pcap_opts->pcap_h != NULL) {
3888 g_assert(!pcap_opts->from_cap_pipe);
3889 /* Get the capture statistics, so we know how many packets were dropped. */
3890 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3891 *stats_known = TRUE;
3892 /* Let the parent process know. */
3893 pcap_dropped += stats->ps_drop;
3895 g_snprintf(errmsg, sizeof(errmsg),
3896 "Can't get packet-drop statistics: %s",
3897 pcap_geterr(pcap_opts->pcap_h));
3898 report_capture_error(errmsg, please_report);
3901 report_packet_drops(received, pcap_dropped, pcap_opts->dropped, pcap_opts->flushed, interface_opts.console_display_name);
3904 /* close the input file (pcap or capture pipe) */
3905 capture_loop_close_input(&global_ld);
3907 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3909 /* ok, if the write and the close were successful. */
3910 return write_ok && close_ok;
3913 if (capture_opts->multi_files_on) {
3914 /* cleanup ringbuffer */
3915 ringbuf_error_cleanup();
3917 /* We can't use the save file, and we have no FILE * for the stream
3918 to close in order to close it, so close the FD directly. */
3919 if (global_ld.save_file_fd != -1) {
3920 ws_close(global_ld.save_file_fd);
3923 /* We couldn't even start the capture, so get rid of the capture
3925 if (capture_opts->save_file != NULL) {
3926 ws_unlink(capture_opts->save_file);
3927 g_free(capture_opts->save_file);
3930 capture_opts->save_file = NULL;
3932 report_cfilter_error(capture_opts, error_index, errmsg);
3934 report_capture_error(errmsg, secondary_errmsg);
3936 /* close the input file (pcap or cap_pipe) */
3937 capture_loop_close_input(&global_ld);
3939 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3946 capture_loop_stop(void)
3948 #ifdef HAVE_PCAP_BREAKLOOP
3950 pcap_options *pcap_opts;
3952 for (i = 0; i < global_ld.pcaps->len; i++) {
3953 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3954 if (pcap_opts->pcap_h != NULL)
3955 pcap_breakloop(pcap_opts->pcap_h);
3958 global_ld.go = FALSE;
3963 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3964 int err, gboolean is_close)
3969 g_snprintf(errmsg, errmsglen,
3970 "Not all the packets could be written to the file"
3971 " to which the capture was being saved\n"
3972 "(\"%s\") because there is no space left on the file system\n"
3973 "on which that file resides.",
3979 g_snprintf(errmsg, errmsglen,
3980 "Not all the packets could be written to the file"
3981 " to which the capture was being saved\n"
3982 "(\"%s\") because you are too close to, or over,"
3983 " your disk quota\n"
3984 "on the file system on which that file resides.",
3991 g_snprintf(errmsg, errmsglen,
3992 "The file to which the capture was being saved\n"
3993 "(\"%s\") could not be closed: %s.",
3994 fname, g_strerror(err));
3996 g_snprintf(errmsg, errmsglen,
3997 "An error occurred while writing to the file"
3998 " to which the capture was being saved\n"
4000 fname, g_strerror(err));
4007 /* one packet was captured, process it */
4009 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
4012 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
4014 guint ts_mul = pcap_opts->ts_nsec ? 1000000000 : 1000000;
4016 /* We may be called multiple times from pcap_dispatch(); if we've set
4017 the "stop capturing" flag, ignore this packet, as we're not
4018 supposed to be saving any more packets. */
4019 if (!global_ld.go) {
4020 pcap_opts->flushed++;
4024 if (global_ld.pdh) {
4025 gboolean successful;
4027 /* We're supposed to write the packet to a file; do so.
4028 If this fails, set "ld->go" to FALSE, to stop the capture, and set
4029 "ld->err" to the error. */
4030 if (global_capture_opts.use_pcapng) {
4031 successful = pcapng_write_enhanced_packet_block(global_ld.pdh,
4033 phdr->ts.tv_sec, (gint32)phdr->ts.tv_usec,
4034 phdr->caplen, phdr->len,
4035 pcap_opts->interface_id,
4038 &global_ld.bytes_written, &err);
4040 successful = libpcap_write_packet(global_ld.pdh,
4041 phdr->ts.tv_sec, (gint32)phdr->ts.tv_usec,
4042 phdr->caplen, phdr->len,
4044 &global_ld.bytes_written, &err);
4047 global_ld.go = FALSE;
4048 global_ld.err = err;
4049 pcap_opts->dropped++;
4051 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4052 "Wrote a packet of length %d captured on interface %u.",
4053 phdr->caplen, pcap_opts->interface_id);
4054 global_ld.packet_count++;
4055 pcap_opts->received++;
4056 /* if the user told us to stop after x packets, do we already have enough? */
4057 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
4058 global_ld.go = FALSE;
4064 /* one packet was captured, queue it */
4066 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
4069 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
4070 pcap_queue_element *queue_element;
4071 gboolean limit_reached;
4073 /* We may be called multiple times from pcap_dispatch(); if we've set
4074 the "stop capturing" flag, ignore this packet, as we're not
4075 supposed to be saving any more packets. */
4076 if (!global_ld.go) {
4077 pcap_opts->flushed++;
4081 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
4082 if (queue_element == NULL) {
4083 pcap_opts->dropped++;
4086 queue_element->pcap_opts = pcap_opts;
4087 queue_element->phdr = *phdr;
4088 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
4089 if (queue_element->pd == NULL) {
4090 pcap_opts->dropped++;
4091 g_free(queue_element);
4094 memcpy(queue_element->pd, pd, phdr->caplen);
4095 g_async_queue_lock(pcap_queue);
4096 if (((pcap_queue_byte_limit == 0) || (pcap_queue_bytes < pcap_queue_byte_limit)) &&
4097 ((pcap_queue_packet_limit == 0) || (pcap_queue_packets < pcap_queue_packet_limit))) {
4098 limit_reached = FALSE;
4099 g_async_queue_push_unlocked(pcap_queue, queue_element);
4100 pcap_queue_bytes += phdr->caplen;
4101 pcap_queue_packets += 1;
4103 limit_reached = TRUE;
4105 g_async_queue_unlock(pcap_queue);
4106 if (limit_reached) {
4107 pcap_opts->dropped++;
4108 g_free(queue_element->pd);
4109 g_free(queue_element);
4110 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4111 "Dropped a packet of length %d captured on interface %u.",
4112 phdr->caplen, pcap_opts->interface_id);
4114 pcap_opts->received++;
4115 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4116 "Queued a packet of length %d captured on interface %u.",
4117 phdr->caplen, pcap_opts->interface_id);
4119 /* I don't want to hold the mutex over the debug output. So the
4120 output may be wrong */
4121 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4122 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
4123 pcap_queue_bytes, pcap_queue_packets);
4127 set_80211_channel(const char *iface, const char *opt)
4129 int freq = 0, type, ret;
4130 gchar **options = NULL;
4132 options = g_strsplit_set(opt, ",", 2);
4135 freq = atoi(options[0]);
4138 type = ws80211_str_to_chan_type(options[1]);
4147 ret = ws80211_init();
4149 cmdarg_err("%d: Failed to init ws80211: %s\n", abs(ret), g_strerror(abs(ret)));
4153 ret = ws80211_set_freq(iface, freq, type);
4156 cmdarg_err("%d: Failed to set channel: %s\n", abs(ret), g_strerror(abs(ret)));
4162 pipe_write_block(2, SP_SUCCESS, NULL);
4166 g_strfreev(options);
4170 /* And now our feature presentation... [ fade to music ] */
4172 main(int argc, char *argv[])
4174 GString *comp_info_str;
4175 GString *runtime_info_str;
4177 struct option long_options[] = {
4178 {(char *)"capture-comment", required_argument, NULL, LONGOPT_NUM_CAP_COMMENT },
4182 gboolean arg_error = FALSE;
4187 struct sigaction action, oldaction;
4190 gboolean start_capture = TRUE;
4191 gboolean stats_known;
4192 struct pcap_stat stats;
4193 GLogLevelFlags log_flags;
4194 gboolean list_interfaces = FALSE;
4195 gboolean list_link_layer_types = FALSE;
4196 #ifdef HAVE_BPF_IMAGE
4197 gboolean print_bpf_code = FALSE;
4199 gboolean set_chan = FALSE;
4200 gchar *set_chan_arg = NULL;
4201 gboolean machine_readable = FALSE;
4202 gboolean print_statistics = FALSE;
4203 int status, run_once_args = 0;
4206 #if defined(__APPLE__) && defined(__LP64__)
4207 struct utsname osinfo;
4211 /* Assemble the compile-time version information string */
4212 comp_info_str = g_string_new("Compiled ");
4213 get_compiled_version_info(comp_info_str, NULL, NULL);
4215 /* Assemble the run-time version information string */
4216 runtime_info_str = g_string_new("Running ");
4217 get_runtime_version_info(runtime_info_str, NULL);
4219 /* Add it to the information to be reported on a crash. */
4220 ws_add_crash_info("Dumpcap " VERSION "%s\n"
4225 wireshark_svnversion, comp_info_str->str, runtime_info_str->str);
4228 arg_list_utf_16to8(argc, argv);
4229 create_app_running_mutex();
4232 * Initialize our DLL search path. MUST be called before LoadLibrary
4235 ws_init_dll_search_path();
4238 #ifdef HAVE_PCAP_REMOTE
4239 #define OPTSTRING_A "A:"
4240 #define OPTSTRING_r "r"
4241 #define OPTSTRING_u "u"
4243 #define OPTSTRING_A ""
4244 #define OPTSTRING_r ""
4245 #define OPTSTRING_u ""
4248 #ifdef HAVE_PCAP_SETSAMPLING
4249 #define OPTSTRING_m "m:"
4251 #define OPTSTRING_m ""
4254 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4255 #define OPTSTRING_B "B:"
4257 #define OPTSTRING_B ""
4258 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4260 #ifdef HAVE_PCAP_CREATE
4261 #define OPTSTRING_I "I"
4263 #define OPTSTRING_I ""
4266 #ifdef HAVE_BPF_IMAGE
4267 #define OPTSTRING_d "d"
4269 #define OPTSTRING_d ""
4272 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "C:c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "k:L" OPTSTRING_m "MN:npPq" OPTSTRING_r "Ss:t" OPTSTRING_u "vw:y:Z:"
4274 #ifdef DEBUG_CHILD_DUMPCAP
4275 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
4276 fprintf (stderr, "Unable to open debug log file !\n");
4281 #if defined(__APPLE__) && defined(__LP64__)
4283 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
4284 * a bug workaround - timeouts less than 1 second don't work with libpcap
4285 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
4286 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
4287 * The problem is extremely unlikely to be reintroduced in a future
4290 if (uname(&osinfo) == 0) {
4292 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
4293 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
4294 * number of 10.0.0, not 10.1.0 - go figure).
4296 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
4297 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
4298 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
4299 need_timeout_workaround = TRUE;
4304 * Determine if dumpcap is being requested to run in a special
4305 * capture_child mode by going thru the command line args to see if
4306 * a -Z is present. (-Z is a hidden option).
4308 * The primary result of running in capture_child mode is that
4309 * all messages sent out on stderr are in a special type/len/string
4310 * format to allow message processing by type. These messages include
4311 * error messages if dumpcap fails to start the operation it was
4312 * requested to do, as well as various "status" messages which are sent
4313 * when an actual capture is in progress, and a "success" message sent
4314 * if dumpcap was requested to perform an operation other than a
4317 * Capture_child mode would normally be requested by a parent process
4318 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
4319 * to which dumpcap stderr has been redirected. It might also have
4320 * another pipe to obtain dumpcap stdout output; for operations other
4321 * than a capture, that information is formatted specially for easier
4322 * parsing by the parent process.
4324 * Capture_child mode needs to be determined immediately upon
4325 * startup so that any messages generated by dumpcap in this mode
4326 * (eg: during initialization) will be formatted properly.
4329 for (i=1; i<argc; i++) {
4330 if (strcmp("-Z", argv[i]) == 0) {
4331 capture_child = TRUE;
4332 machine_readable = TRUE; /* request machine-readable output */
4334 /* set output pipe to binary mode, to avoid ugly text conversions */
4335 _setmode(2, O_BINARY);
4340 /* The default_log_handler will use stdout, which makes trouble in */
4341 /* capture child mode, as it uses stdout for its sync_pipe. */
4342 /* So: the filtering is done in the console_log_handler and not here.*/
4343 /* We set the log handlers right up front to make sure that any log */
4344 /* messages when running as child will be sent back to the parent */
4345 /* with the correct format. */
4350 G_LOG_LEVEL_CRITICAL|
4351 G_LOG_LEVEL_WARNING|
4352 G_LOG_LEVEL_MESSAGE|
4356 G_LOG_FLAG_RECURSION);
4358 g_log_set_handler(NULL,
4360 console_log_handler, NULL /* user_data */);
4361 g_log_set_handler(LOG_DOMAIN_MAIN,
4363 console_log_handler, NULL /* user_data */);
4364 g_log_set_handler(LOG_DOMAIN_CAPTURE,
4366 console_log_handler, NULL /* user_data */);
4367 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
4369 console_log_handler, NULL /* user_data */);
4371 /* Initialize the pcaps list */
4372 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
4374 #if !GLIB_CHECK_VERSION(2,31,0)
4375 /* Initialize the thread system */
4376 g_thread_init(NULL);
4380 /* Load wpcap if possible. Do this before collecting the run-time version information */
4383 /* ... and also load the packet.dll from wpcap */
4384 /* XXX - currently not required, may change later. */
4385 /*wpcap_packet_load();*/
4387 /* Start windows sockets */
4388 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
4390 /* Set handler for Ctrl+C key */
4391 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
4393 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
4394 and exit. Do the same with SIGPIPE, in case, for example,
4395 we're writing to our standard output and it's a pipe.
4396 Do the same with SIGHUP if it's not being ignored (if we're
4397 being run under nohup, it might be ignored, in which case we
4398 should leave it ignored).
4400 XXX - apparently, Coverity complained that part of action
4401 wasn't initialized. Perhaps it's running on Linux, where
4402 struct sigaction has an ignored "sa_restorer" element and
4403 where "sa_handler" and "sa_sigaction" might not be two
4404 members of a union. */
4405 memset(&action, 0, sizeof(action));
4406 action.sa_handler = capture_cleanup_handler;
4408 * Arrange that system calls not get restarted, because when
4409 * our signal handler returns we don't want to restart
4410 * a call that was waiting for packets to arrive.
4412 action.sa_flags = 0;
4413 sigemptyset(&action.sa_mask);
4414 sigaction(SIGTERM, &action, NULL);
4415 sigaction(SIGINT, &action, NULL);
4416 sigaction(SIGPIPE, &action, NULL);
4417 sigaction(SIGHUP, NULL, &oldaction);
4418 if (oldaction.sa_handler == SIG_DFL)
4419 sigaction(SIGHUP, &action, NULL);
4422 /* Catch SIGINFO and, if we get it and we're capturing in
4423 quiet mode, report the number of packets we've captured. */
4424 action.sa_handler = report_counts_siginfo;
4425 action.sa_flags = SA_RESTART;
4426 sigemptyset(&action.sa_mask);
4427 sigaction(SIGINFO, &action, NULL);
4428 #endif /* SIGINFO */
4432 enable_kernel_bpf_jit_compiler();
4435 /* ----------------------------------------------------------------- */
4436 /* Privilege and capability handling */
4438 /* 1. Running not as root or suid root; no special capabilities. */
4441 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
4444 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
4446 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4447 /* capabilities; Drop all other capabilities; */
4448 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4449 /* else: after pcap_open_live() in capture_loop_open_input() */
4450 /* drop all capabilities (NET_RAW and NET_ADMIN); */
4451 /* (Note: this means that the process, although logged in */
4452 /* as root, does not have various permissions such as the */
4453 /* ability to bypass file access permissions). */
4454 /* XXX: Should we just leave capabilities alone in this case */
4455 /* so that user gets expected effect that root can do */
4458 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
4460 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4461 /* else: after pcap_open_live() in capture_loop_open_input() */
4462 /* drop suid root (set euid=ruid).(ie: keep suid until after */
4463 /* pcap_open_live). */
4465 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
4467 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4468 /* capabilities; Drop all other capabilities; */
4469 /* Drop suid privileges (euid=ruid); */
4470 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4471 /* else: after pcap_open_live() in capture_loop_open_input() */
4472 /* drop all capabilities (NET_RAW and NET_ADMIN). */
4474 /* XXX: For some Linux versions/distros with capabilities */
4475 /* a 'normal' process with any capabilities cannot be */
4476 /* 'killed' (signaled) from another (same uid) non-privileged */
4478 /* For example: If (non-suid) Wireshark forks a */
4479 /* child suid dumpcap which acts as described here (case 5), */
4480 /* Wireshark will be unable to kill (signal) the child */
4481 /* dumpcap process until the capabilities have been dropped */
4482 /* (after pcap_open_live()). */
4483 /* This behaviour will apparently be changed in the kernel */
4484 /* to allow the kill (signal) in this case. */
4485 /* See the following for details: */
4486 /* http://www.mail-archive.com/ [wrapped] */
4487 /* linux-security-module@vger.kernel.org/msg02913.html */
4489 /* It is therefore conceivable that if dumpcap somehow hangs */
4490 /* in pcap_open_live or before that wireshark will not */
4491 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
4492 /* In this case, exiting wireshark will kill the child */
4493 /* dumpcap process. */
4495 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
4496 /* capabilities; Using libcap. Note: capset cmd (which see) */
4497 /* used to assign capabilities to file. */
4499 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4500 /* else: after pcap_open_live() in capture_loop_open_input() */
4501 /* drop all capabilities (NET_RAW and NET_ADMIN) */
4503 /* ToDo: -S (stats) should drop privileges/capabilities when no */
4504 /* longer required (similar to capture). */
4506 /* ----------------------------------------------------------------- */
4508 init_process_policies();
4511 /* If 'started with special privileges' (and using libcap) */
4512 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
4513 /* Set euid/egid = ruid/rgid to remove suid privileges */
4514 relinquish_privs_except_capture();
4517 /* Set the initial values in the capture options. This might be overwritten
4518 by the command line parameters. */
4519 capture_opts_init(&global_capture_opts);
4521 /* We always save to a file - if no file was specified, we save to a
4523 global_capture_opts.saving_to_file = TRUE;
4524 global_capture_opts.has_ring_num_files = TRUE;
4526 /* Pass on capture_child mode for capture_opts */
4527 global_capture_opts.capture_child = capture_child;
4529 /* Now get our args */
4530 while ((opt = getopt_long(argc, argv, OPTSTRING, long_options, NULL)) != -1) {
4532 case 'h': /* Print help and exit */
4536 case 'v': /* Show version and exit */
4538 show_version(comp_info_str, runtime_info_str);
4539 g_string_free(comp_info_str, TRUE);
4540 g_string_free(runtime_info_str, TRUE);
4544 /*** capture option specific ***/
4545 case 'a': /* autostop criteria */
4546 case 'b': /* Ringbuffer option */
4547 case 'c': /* Capture x packets */
4548 case 'f': /* capture filter */
4549 case 'g': /* enable group read access on file(s) */
4550 case 'i': /* Use interface x */
4551 case 'n': /* Use pcapng format */
4552 case 'p': /* Don't capture in promiscuous mode */
4553 case 'P': /* Use pcap format */
4554 case 's': /* Set the snapshot (capture) length */
4555 case 'w': /* Write to capture file x */
4556 case 'y': /* Set the pcap data link type */
4557 case LONGOPT_NUM_CAP_COMMENT: /* add a capture comment */
4558 #ifdef HAVE_PCAP_REMOTE
4559 case 'u': /* Use UDP for data transfer */
4560 case 'r': /* Capture own RPCAP traffic too */
4561 case 'A': /* Authentication */
4563 #ifdef HAVE_PCAP_SETSAMPLING
4564 case 'm': /* Sampling */
4566 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4567 case 'B': /* Buffer size */
4568 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4569 #ifdef HAVE_PCAP_CREATE
4570 case 'I': /* Monitor mode */
4572 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4577 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4579 capture_child = TRUE;
4581 /* set output pipe to binary mode, to avoid ugly text conversions */
4582 _setmode(2, O_BINARY);
4584 * optarg = the control ID, aka the PPID, currently used for the
4587 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4588 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4589 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4590 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4592 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4593 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4594 "Signal pipe: Unable to open %s. Dead parent?",
4602 case 'q': /* Quiet */
4608 /*** all non capture option specific ***/
4609 case 'D': /* Print a list of capture devices and exit */
4610 list_interfaces = TRUE;
4613 case 'L': /* Print list of link-layer types and exit */
4614 list_link_layer_types = TRUE;
4617 #ifdef HAVE_BPF_IMAGE
4618 case 'd': /* Print BPF code for capture filter and exit */
4619 print_bpf_code = TRUE;
4623 case 'S': /* Print interface statistics once a second */
4624 print_statistics = TRUE;
4627 case 'k': /* Set wireless channel */
4629 set_chan_arg = optarg;
4632 case 'M': /* For -D, -L, and -S, print machine-readable output */
4633 machine_readable = TRUE;
4636 pcap_queue_byte_limit = get_positive_int(optarg, "byte_limit");
4639 pcap_queue_packet_limit = get_positive_int(optarg, "packet_limit");
4642 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4644 case '?': /* Bad flag - print usage message */
4653 /* user specified file name as regular command-line argument */
4654 /* XXX - use it as the capture file name (or something else)? */
4660 * Extra command line arguments were specified; complain.
4661 * XXX - interpret as capture filter, as tcpdump and tshark do?
4663 cmdarg_err("Invalid argument: %s", argv[0]);
4668 if ((pcap_queue_byte_limit > 0) || (pcap_queue_packet_limit > 0)) {
4671 if ((pcap_queue_byte_limit == 0) && (pcap_queue_packet_limit == 0)) {
4672 /* Use some default if the user hasn't specified some */
4673 /* XXX: Are these defaults good enough? */
4674 pcap_queue_byte_limit = 1000 * 1000;
4675 pcap_queue_packet_limit = 1000;
4682 if (run_once_args > 1) {
4683 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4685 } else if (run_once_args == 1) {
4686 /* We're supposed to print some information, rather than
4687 to capture traffic; did they specify a ring buffer option? */
4688 if (global_capture_opts.multi_files_on) {
4689 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4693 /* We're supposed to capture traffic; */
4695 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4696 if (global_capture_opts.ifaces->len > 1) {
4698 global_capture_opts.use_pcapng = TRUE;
4701 if (global_capture_opts.capture_comment &&
4702 (!global_capture_opts.use_pcapng || global_capture_opts.multi_files_on)) {
4703 /* XXX - for ringbuffer, should we apply the comment to each file? */
4704 cmdarg_err("A capture comment can only be set if we capture into a single pcapng file.");
4708 /* Was the ring buffer option specified and, if so, does it make sense? */
4709 if (global_capture_opts.multi_files_on) {
4710 /* Ring buffer works only under certain conditions:
4711 a) ring buffer does not work with temporary files;
4712 b) it makes no sense to enable the ring buffer if the maximum
4713 file size is set to "infinite". */
4714 if (global_capture_opts.save_file == NULL) {
4715 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4716 global_capture_opts.multi_files_on = FALSE;
4718 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4719 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4721 /* XXX - this must be redesigned as the conditions changed */
4722 global_capture_opts.multi_files_on = FALSE;
4729 * "-D" requires no interface to be selected; it's supposed to list
4732 if (list_interfaces) {
4733 /* Get the list of interfaces */
4738 if_list = capture_interface_list(&err, &err_str,NULL);
4739 if (if_list == NULL) {
4741 case CANT_GET_INTERFACE_LIST:
4742 case DONT_HAVE_PCAP:
4743 cmdarg_err("%s", err_str);
4748 case NO_INTERFACES_FOUND:
4750 * If we're being run by another program, just give them
4751 * an empty list of interfaces, don't report this as
4752 * an error; that lets them decide whether to report
4753 * this as an error or not.
4755 if (!machine_readable) {
4756 cmdarg_err("There are no interfaces on which a capture can be done");
4763 if (machine_readable) /* tab-separated values to stdout */
4764 print_machine_readable_interfaces(if_list);
4766 capture_opts_print_interfaces(if_list);
4767 free_interface_list(if_list);
4772 * "-S" requires no interface to be selected; it gives statistics
4773 * for all interfaces.
4775 if (print_statistics) {
4776 status = print_statistics_loop(machine_readable);
4781 interface_options interface_opts;
4783 if (global_capture_opts.ifaces->len != 1) {
4784 cmdarg_err("Need one interface");
4788 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, 0);
4789 status = set_80211_channel(interface_opts.name, set_chan_arg);
4794 * "-L", "-d", and capturing act on a particular interface, so we have to
4795 * have an interface; if none was specified, pick a default.
4797 status = capture_opts_default_iface_if_necessary(&global_capture_opts, NULL);
4799 /* cmdarg_err() already called .... */
4803 /* Let the user know what interfaces were chosen. */
4804 if (capture_child) {
4805 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4806 interface_options interface_opts;
4808 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4809 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n",
4810 interface_opts.name);
4813 str = g_string_new("");
4815 if (global_capture_opts.ifaces->len < 2)
4817 if (global_capture_opts.ifaces->len < 4)
4820 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4821 interface_options interface_opts;
4823 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4825 if (global_capture_opts.ifaces->len > 2) {
4826 g_string_append_printf(str, ",");
4828 g_string_append_printf(str, " ");
4829 if (j == global_capture_opts.ifaces->len - 1) {
4830 g_string_append_printf(str, "and ");
4833 g_string_append_printf(str, "'%s'", interface_opts.console_display_name);
4836 g_string_append_printf(str, "%u interfaces", global_capture_opts.ifaces->len);
4838 fprintf(stderr, "Capturing on %s\n", str->str);
4839 g_string_free(str, TRUE);
4842 if (list_link_layer_types) {
4843 /* Get the list of link-layer types for the capture device. */
4844 if_capabilities_t *caps;
4848 for (ii = 0; ii < global_capture_opts.ifaces->len; ii++) {
4849 interface_options interface_opts;
4851 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, ii);
4852 caps = get_if_capabilities(interface_opts.name,
4853 interface_opts.monitor_mode, &err_str);
4855 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4856 "Please check to make sure you have sufficient permissions, and that\n"
4857 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4861 if (caps->data_link_types == NULL) {
4862 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4865 if (machine_readable) /* tab-separated values to stdout */
4866 /* XXX: We need to change the format and adopt consumers */
4867 print_machine_readable_if_capabilities(caps);
4869 /* XXX: We might want to print also the interface name */
4870 capture_opts_print_if_capabilities(caps, interface_opts.name,
4871 interface_opts.monitor_mode);
4872 free_if_capabilities(caps);
4877 /* We're supposed to do a capture, or print the BPF code for a filter.
4878 Process the snapshot length, as that affects the generated BPF code. */
4879 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4881 #ifdef HAVE_BPF_IMAGE
4882 if (print_bpf_code) {
4883 show_filter_code(&global_capture_opts);
4888 /* We're supposed to do a capture. Process the ring buffer arguments. */
4889 capture_opts_trim_ring_num_files(&global_capture_opts);
4891 /* flush stderr prior to starting the main capture loop */
4894 /* Now start the capture. */
4896 if (capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4900 /* capture failed */
4903 return 0; /* never here, make compiler happy */
4908 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4909 const char *message, gpointer user_data _U_)
4916 /* ignore log message, if log_level isn't interesting */
4917 if ( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4918 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4923 /* create a "timestamp" */
4925 today = localtime(&curr);
4927 switch(log_level & G_LOG_LEVEL_MASK) {
4928 case G_LOG_LEVEL_ERROR:
4931 case G_LOG_LEVEL_CRITICAL:
4934 case G_LOG_LEVEL_WARNING:
4937 case G_LOG_LEVEL_MESSAGE:
4940 case G_LOG_LEVEL_INFO:
4943 case G_LOG_LEVEL_DEBUG:
4947 fprintf(stderr, "unknown log_level %u\n", log_level);
4949 g_assert_not_reached();
4952 /* Generate the output message */
4953 if (log_level & G_LOG_LEVEL_MESSAGE) {
4954 /* normal user messages without additional infos */
4955 msg = g_strdup_printf("%s\n", message);
4957 /* info/debug messages with additional infos */
4958 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4959 today->tm_hour, today->tm_min, today->tm_sec,
4960 log_domain != NULL ? log_domain : "",
4964 /* DEBUG & INFO msgs (if we're debugging today) */
4965 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4966 if ( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4967 #ifdef DEBUG_DUMPCAP
4968 fprintf(stderr, "%s", msg);
4971 #ifdef DEBUG_CHILD_DUMPCAP
4972 fprintf(debug_log, "%s", msg);
4980 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4981 /* to parent especially formatted if dumpcap running as child. */
4982 if (capture_child) {
4983 sync_pipe_errmsg_to_parent(2, msg, "");
4985 fprintf(stderr, "%s", msg);
4992 /****************************************************************************************************************/
4993 /* indication report routines */
4997 report_packet_count(unsigned int packet_count)
4999 char tmp[SP_DECISIZE+1+1];
5000 static unsigned int count = 0;
5002 if (capture_child) {
5003 g_snprintf(tmp, sizeof(tmp), "%u", packet_count);
5004 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
5005 pipe_write_block(2, SP_PACKET_COUNT, tmp);
5007 count += packet_count;
5008 fprintf(stderr, "\rPackets: %u ", count);
5009 /* stderr could be line buffered */
5015 report_new_capture_file(const char *filename)
5017 if (capture_child) {
5018 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
5019 pipe_write_block(2, SP_FILE, filename);
5023 * Prevent a SIGINFO handler from writing to the standard error
5024 * while we're doing so; instead, have it just set a flag telling
5025 * us to print that information when we're done.
5028 #endif /* SIGINFO */
5029 fprintf(stderr, "File: %s\n", filename);
5030 /* stderr could be line buffered */
5035 * Allow SIGINFO handlers to write.
5040 * If a SIGINFO handler asked us to write out capture counts, do so.
5043 report_counts_for_siginfo();
5044 #endif /* SIGINFO */
5049 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
5051 interface_options interface_opts;
5052 char tmp[MSG_MAX_LENGTH+1+6];
5054 if (i < capture_opts->ifaces->len) {
5055 if (capture_child) {
5056 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
5057 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
5058 pipe_write_block(2, SP_BAD_FILTER, tmp);
5061 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
5062 * the error message below.
5064 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
5066 "Invalid capture filter \"%s\" for interface %s!\n"
5068 "That string isn't a valid capture filter (%s).\n"
5069 "See the User's Guide for a description of the capture filter syntax.",
5070 interface_opts.cfilter, interface_opts.name, errmsg);
5076 report_capture_error(const char *error_msg, const char *secondary_error_msg)
5078 if (capture_child) {
5079 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
5080 "Primary Error: %s", error_msg);
5081 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
5082 "Secondary Error: %s", secondary_error_msg);
5083 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
5085 cmdarg_err("%s", error_msg);
5086 if (secondary_error_msg[0] != '\0')
5087 cmdarg_err_cont("%s", secondary_error_msg);
5092 report_packet_drops(guint32 received, guint32 pcap_drops, guint32 drops, guint32 flushed, gchar *name)
5094 char tmp[SP_DECISIZE+1+1];
5095 guint32 total_drops = pcap_drops + drops + flushed;
5097 g_snprintf(tmp, sizeof(tmp), "%u", total_drops);
5099 if (capture_child) {
5100 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
5101 "Packets received/dropped on interface %s: %u/%u (pcap:%u/dumpcap:%u/flushed:%u)",
5102 name, received, total_drops, pcap_drops, drops, flushed);
5103 /* XXX: Need to provide interface id, changes to consumers required. */
5104 pipe_write_block(2, SP_DROPS, tmp);
5107 "Packets received/dropped on interface '%s': %u/%u (pcap:%u/dumpcap:%u/flushed:%u) (%.1f%%)\n",
5108 name, received, total_drops, pcap_drops, drops, flushed,
5109 received ? 100.0 * received / (received + total_drops) : 0.0);
5110 /* stderr could be line buffered */
5116 /************************************************************************************************/
5117 /* signal_pipe handling */
5122 signal_pipe_check_running(void)
5124 /* any news from our parent? -> just stop the capture */
5128 /* if we are running standalone, no check required */
5129 if (!capture_child) {
5133 if (!sig_pipe_name || !sig_pipe_handle) {
5134 /* This shouldn't happen */
5135 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
5136 "Signal pipe: No name or handle");
5141 * XXX - We should have the process ID of the parent (from the "-Z" flag)
5142 * at this point. Should we check to see if the parent is still alive,
5143 * e.g. by using OpenProcess?
5146 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
5148 if (!result || avail > 0) {
5149 /* peek failed or some bytes really available */
5150 /* (if not piping from stdin this would fail) */
5151 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
5152 "Signal pipe: Stop capture: %s", sig_pipe_name);
5153 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
5154 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
5155 sig_pipe_handle, result, avail);
5158 /* pipe ok and no bytes available */
5169 * Editor modelines - http://www.wireshark.org/tools/modelines.html
5174 * indent-tabs-mode: nil
5177 * vi: set shiftwidth=4 tabstop=8 expandtab:
5178 * :indentSize=4:tabSize=8:noTabs=true: