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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
63 #include "wsutil/wsgetopt.h"
71 # include <sys/prctl.h>
72 # include <sys/capability.h>
75 #include "ringbuffer.h"
76 #include "clopts_common.h"
77 #include "console_io.h"
78 #include "cmdarg_err.h"
79 #include "version_info.h"
81 #include "capture-pcap-util.h"
86 #include "capture-wpcap.h"
87 #include <wsutil/unicode-utils.h>
91 #include <sys/socket.h>
95 #ifdef NEED_INET_V6DEFS_H
96 # include "wsutil/inet_v6defs.h"
99 #include <wsutil/privileges.h>
101 #include "sync_pipe.h"
103 #include "capture_opts.h"
104 #include "capture_ifinfo.h"
105 #include "capture_sync.h"
107 #include "conditions.h"
108 #include "capture_stop_conditions.h"
110 #include "tempfile.h"
112 #include "wsutil/file_util.h"
115 * Get information about libpcap format from "wiretap/libpcap.h".
116 * XXX - can we just use pcap_open_offline() to read the pipe?
118 #include "wiretap/libpcap.h"
120 /**#define DEBUG_DUMPCAP**/
121 /**#define DEBUG_CHILD_DUMPCAP**/
125 #include <conio.h> /* _getch() */
129 #ifdef DEBUG_CHILD_DUMPCAP
130 FILE *debug_log; /* for logging debug messages to */
131 /* a file if DEBUG_CHILD_DUMPCAP */
135 static GAsyncQueue *pcap_queue;
136 static gint64 pcap_queue_bytes;
137 static gint64 pcap_queue_packets;
138 static gint64 pcap_queue_byte_limit = 1024 * 1024;
139 static gint64 pcap_queue_packet_limit = 1000;
141 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
143 static gchar *sig_pipe_name = NULL;
144 static HANDLE sig_pipe_handle = NULL;
145 static gboolean signal_pipe_check_running(void);
149 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
150 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
153 /** Stop a low-level capture (stops the capture child). */
154 static void capture_loop_stop(void);
156 #if !defined (__linux__)
157 #ifndef HAVE_PCAP_BREAKLOOP
159 * We don't have pcap_breakloop(), which is the only way to ensure that
160 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
161 * won't, if the call to read the next packet or batch of packets is
162 * is interrupted by a signal on UN*X, just go back and try again to
165 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
166 * the signal handler, set a flag to stop capturing; however, without
167 * a guarantee of that sort, we can't guarantee that we'll stop capturing
168 * if the read will be retried and won't time out if no packets arrive.
170 * Therefore, on at least some platforms, we work around the lack of
171 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
172 * to wait for packets to arrive, so that we're probably going to be
173 * blocked in the select() when the signal arrives, and can just bail
174 * out of the loop at that point.
176 * However, we don't want to do that on BSD (because "select()" doesn't work
177 * correctly on BPF devices on at least some releases of some flavors of
178 * BSD), and we don't want to do it on Windows (because "select()" is
179 * something for sockets, not for arbitrary handles). (Note that "Windows"
180 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
181 * using WinPcap, not a UNIX libpcap.)
183 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
184 * on BSD times out even if no packets have arrived, so we'll eventually
185 * exit pcap_dispatch() with an indication that no packets have arrived,
186 * and will break out of the capture loop at that point.
188 * On Windows, we can't send a SIGINT to stop capturing, so none of this
189 * applies in any case.
191 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
192 * want to include it if it's not present on this platform, however.
194 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
195 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
197 # define MUST_DO_SELECT
198 # endif /* avoid select */
199 #endif /* HAVE_PCAP_BREAKLOOP */
201 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
202 * in pcap_dispatch(); on the other hand, select() works just fine there.
203 * Hence we use a select for that come what may.
205 #define MUST_DO_SELECT
208 /** init the capture filter */
211 INITFILTER_BAD_FILTER,
212 INITFILTER_OTHER_ERROR
213 } initfilter_status_t;
215 typedef struct _pcap_options {
219 #ifdef MUST_DO_SELECT
220 int pcap_fd; /* pcap file descriptor */
227 /* capture pipe (unix only "input file") */
228 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
229 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
230 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
232 HANDLE cap_pipe_h; /* The handle of the capture pipe */
234 int cap_pipe_fd; /* the file descriptor of the capture pipe */
236 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
237 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
238 #if defined(USE_THREADS) && defined(_WIN32)
239 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
241 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
242 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
244 STATE_EXPECT_REC_HDR,
249 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
250 #if defined(USE_THREADS) && defined(_WIN32)
251 GMutex *cap_pipe_read_mtx;
252 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
256 typedef struct _loop_data {
258 gboolean go; /* TRUE as long as we're supposed to keep capturing */
259 int err; /* if non-zero, error seen while capturing */
260 gint packet_count; /* Number of packets we have already captured */
261 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
262 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
264 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
271 guint32 autostop_files;
274 typedef struct _pcap_queue_element {
275 pcap_options *pcap_opts;
276 struct pcap_pkthdr phdr;
278 } pcap_queue_element;
281 * Standard secondary message for unexpected errors.
283 static const char please_report[] =
284 "Please report this to the Wireshark developers.\n"
285 "(This is not a crash; please do not report it as such.)";
288 * This needs to be static, so that the SIGINT handler can clear the "go"
291 static loop_data global_ld;
295 * Timeout, in milliseconds, for reads from the stream of captured packets
296 * from a capture device.
298 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
299 * 64-bit applications, with sub-second timeouts not to work. The bug is
300 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
302 #if defined(__APPLE__) && defined(__LP64__)
303 static gboolean need_timeout_workaround;
305 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
307 #define CAP_READ_TIMEOUT 250
311 * Timeout, in microseconds, for reads from the stream of captured packets
312 * from a pipe. Pipes don't have the same problem that BPF devices do
313 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
314 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
315 * of the offending versions of Snow Leopard.
317 * On Windows this value is converted to milliseconds and passed to
318 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
319 * will return immediately.
321 #if defined(USE_THREADS) && defined(_WIN32)
322 #define PIPE_READ_TIMEOUT 100000
324 #define PIPE_READ_TIMEOUT 250000
327 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
330 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
331 const char *message, gpointer user_data _U_);
333 /* capture related options */
334 static capture_options global_capture_opts;
335 static gboolean quiet = FALSE;
336 static gboolean use_threads = FALSE;
338 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
340 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
342 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
343 int err, gboolean is_close);
345 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
347 static void report_new_capture_file(const char *filename);
348 static void report_packet_count(int packet_count);
349 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
350 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
351 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
353 #define MSG_MAX_LENGTH 4096
356 print_usage(gboolean print_ver)
363 "Dumpcap " VERSION "%s\n"
364 "Capture network packets and dump them into a libpcap file.\n"
365 "See http://www.wireshark.org for more information.\n",
366 wireshark_svnversion);
370 fprintf(output, "\nUsage: dumpcap [options] ...\n");
371 fprintf(output, "\n");
372 fprintf(output, "Capture interface:\n");
373 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
374 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
375 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
376 fprintf(output, " -p don't capture in promiscuous mode\n");
377 #ifdef HAVE_PCAP_CREATE
378 fprintf(output, " -I capture in monitor mode, if available\n");
380 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
381 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
383 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
384 fprintf(output, " -D print list of interfaces and exit\n");
385 fprintf(output, " -L print list of link-layer types of iface and exit\n");
386 #ifdef HAVE_BPF_IMAGE
387 fprintf(output, " -d print generated BPF code for capture filter\n");
389 fprintf(output, " -S print statistics for each interface once per second\n");
390 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
391 fprintf(output, "\n");
392 #ifdef HAVE_PCAP_REMOTE
393 fprintf(output, "RPCAP options:\n");
394 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
395 fprintf(output, " -u use UDP for RPCAP data transfer\n");
396 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
397 #ifdef HAVE_PCAP_SETSAMPLING
398 fprintf(output, " -m <sampling type> use packet sampling\n");
399 fprintf(output, " count:NUM - capture one packet of every NUM\n");
400 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
403 fprintf(output, "Stop conditions:\n");
404 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
405 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
406 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
407 fprintf(output, " files:NUM - stop after NUM files\n");
408 /*fprintf(output, "\n");*/
409 fprintf(output, "Output (files):\n");
410 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
411 fprintf(output, " -g enable group read access on the output file(s)\n");
412 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
413 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
414 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
415 fprintf(output, " -n use pcapng format instead of pcap\n");
416 fprintf(output, "\n");
417 fprintf(output, "Miscellaneous:\n");
419 fprintf(output, " -t use a separate thread per interface\n");
421 fprintf(output, " -q don't report packet capture counts\n");
422 fprintf(output, " -v print version information and exit\n");
423 fprintf(output, " -h display this help and exit\n");
424 fprintf(output, "\n");
425 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
426 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
427 fprintf(output, "\n");
428 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
432 show_version(GString *comp_info_str, GString *runtime_info_str)
435 "Dumpcap " VERSION "%s\n"
440 "See http://www.wireshark.org for more information.\n",
441 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
445 * Print to the standard error. This is a command-line tool, so there's
446 * no need to pop up a console.
449 vfprintf_stderr(const char *fmt, va_list ap)
451 vfprintf(stderr, fmt, ap);
455 fprintf_stderr(const char *fmt, ...)
460 vfprintf_stderr(fmt, ap);
465 * Report an error in command-line arguments.
468 cmdarg_err(const char *fmt, ...)
474 /* Generate a 'special format' message back to parent */
476 msg = g_strdup_vprintf(fmt, ap);
477 sync_pipe_errmsg_to_parent(2, msg, "");
482 fprintf(stderr, "dumpcap: ");
483 vfprintf(stderr, fmt, ap);
484 fprintf(stderr, "\n");
490 * Report additional information for an error in command-line arguments.
493 cmdarg_err_cont(const char *fmt, ...)
500 msg = g_strdup_vprintf(fmt, ap);
501 sync_pipe_errmsg_to_parent(2, msg, "");
506 vfprintf(stderr, fmt, ap);
507 fprintf(stderr, "\n");
514 #if 0 /* Set to enable capability debugging */
515 /* see 'man cap_to_text()' for explanation of output */
516 /* '=' means 'all= ' ie: no capabilities */
517 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
519 print_caps(const char *pfx) {
520 cap_t caps = cap_get_proc();
521 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
522 "%s: EUID: %d Capabilities: %s", pfx,
523 geteuid(), cap_to_text(caps, NULL));
526 print_caps(const char *pfx _U_) {
531 relinquish_all_capabilities(void)
533 /* Drop any and all capabilities this process may have. */
534 /* Allowed whether or not process has any privileges. */
535 cap_t caps = cap_init(); /* all capabilities initialized to off */
536 print_caps("Pre-clear");
537 if (cap_set_proc(caps)) {
538 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
540 print_caps("Post-clear");
546 open_capture_device(interface_options *interface_opts,
547 char (*open_err_str)[PCAP_ERRBUF_SIZE])
550 #ifdef HAVE_PCAP_CREATE
553 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
554 struct pcap_rmtauth auth;
557 /* Open the network interface to capture from it.
558 Some versions of libpcap may put warnings into the error buffer
559 if they succeed; to tell if that's happened, we have to clear
560 the error buffer, and check if it's still a null string. */
561 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Entering open_capture_device().");
562 (*open_err_str)[0] = '\0';
563 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
565 * If we're opening a remote device, use pcap_open(); that's currently
566 * the only open routine that supports remote devices.
568 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
569 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
570 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
571 auth.username = interface_opts->auth_username;
572 auth.password = interface_opts->auth_password;
574 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
575 "Calling pcap_open() using name %s, snaplen %d, promisc_mode %d, datatx_udp %d, nocap_rpcap %d.",
576 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode,
577 interface_opts->datatx_udp, interface_opts->nocap_rpcap);
578 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
580 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
581 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
582 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
583 CAP_READ_TIMEOUT, &auth, *open_err_str);
584 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
585 "pcap_open() returned %p.", (void *)pcap_h);
590 * If we're not opening a remote device, use pcap_create() and
591 * pcap_activate() if we have them, so that we can set the buffer
592 * size, otherwise use pcap_open_live().
594 #ifdef HAVE_PCAP_CREATE
595 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
596 "Calling pcap_create() using %s.", interface_opts->name);
597 pcap_h = pcap_create(interface_opts->name, *open_err_str);
598 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
599 "pcap_create() returned %p.", (void *)pcap_h);
600 if (pcap_h != NULL) {
601 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
602 "Calling pcap_set_snaplen() with snaplen %d.", interface_opts->snaplen);
603 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
604 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
605 "Calling pcap_set_snaplen() with promisc_mode %d.", interface_opts->promisc_mode);
606 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
607 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
609 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
610 "buffersize %d.", interface_opts->buffer_size);
611 if (interface_opts->buffer_size > 1) {
612 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
614 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
615 "monitor_mode %d.", interface_opts->monitor_mode);
616 if (interface_opts->monitor_mode)
617 pcap_set_rfmon(pcap_h, 1);
618 err = pcap_activate(pcap_h);
619 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
620 "pcap_activate() returned %d.", err);
622 /* Failed to activate, set to NULL */
623 if (err == PCAP_ERROR)
624 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
626 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
632 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
633 "pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
634 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode);
635 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
636 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
638 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
639 "pcap_open_live() returned %p.", (void *)pcap_h);
642 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
647 get_capture_device_open_failure_messages(const char *open_err_str,
653 char *errmsg, size_t errmsg_len,
654 char *secondary_errmsg,
655 size_t secondary_errmsg_len)
657 const char *libpcap_warn;
658 static const char ppamsg[] = "can't find PPA for ";
660 /* If we got a "can't find PPA for X" message, warn the user (who
661 is running dumcap on HP-UX) that they don't have a version of
662 libpcap that properly handles HP-UX (libpcap 0.6.x and later
663 versions, which properly handle HP-UX, say "can't find /dev/dlpi
664 PPA for X" rather than "can't find PPA for X"). */
665 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
668 "You are running (T)Wireshark with a version of the libpcap library\n"
669 "that doesn't handle HP-UX network devices well; this means that\n"
670 "(T)Wireshark may not be able to capture packets.\n"
672 "To fix this, you should install libpcap 0.6.2, or a later version\n"
673 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
674 "packaged binary form from the Software Porting And Archive Centre\n"
675 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
676 "at the URL lists a number of mirror sites.";
679 g_snprintf(errmsg, (gulong) errmsg_len,
680 "The capture session could not be initiated (%s).", open_err_str);
682 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
683 "Please check to make sure you have sufficient permissions, and that you have "
684 "the proper interface or pipe specified.%s", libpcap_warn);
686 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
688 "Please check that \"%s\" is the proper interface.\n"
691 "Help can be found at:\n"
693 " http://wiki.wireshark.org/WinPcap\n"
694 " http://wiki.wireshark.org/CaptureSetup\n",
699 /* Set the data link type on a pcap. */
701 set_pcap_linktype(pcap_t *pcap_h, int linktype,
702 #ifdef HAVE_PCAP_SET_DATALINK
707 char *errmsg, size_t errmsg_len,
708 char *secondary_errmsg, size_t secondary_errmsg_len)
710 char *set_linktype_err_str;
713 return TRUE; /* just use the default */
714 #ifdef HAVE_PCAP_SET_DATALINK
715 if (pcap_set_datalink(pcap_h, linktype) == 0)
716 return TRUE; /* no error */
717 set_linktype_err_str = pcap_geterr(pcap_h);
719 /* Let them set it to the type it is; reject any other request. */
720 if (get_pcap_linktype(pcap_h, name) == linktype)
721 return TRUE; /* no error */
722 set_linktype_err_str =
723 "That DLT isn't one of the DLTs supported by this device";
725 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
726 set_linktype_err_str);
728 * If the error isn't "XXX is not one of the DLTs supported by this device",
729 * tell the user to tell the Wireshark developers about it.
731 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
732 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
734 secondary_errmsg[0] = '\0';
739 compile_capture_filter(const char *iface, pcap_t *pcap_h,
740 struct bpf_program *fcode, const char *cfilter)
742 bpf_u_int32 netnum, netmask;
743 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
745 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
747 * Well, we can't get the netmask for this interface; it's used
748 * only for filters that check for broadcast IP addresses, so
749 * we just punt and use 0. It might be nice to warn the user,
750 * but that's a pain in a GUI application, as it'd involve popping
751 * up a message box, and it's not clear how often this would make
752 * a difference (only filters that check for IP broadcast addresses
756 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
761 * Sigh. Older versions of libpcap don't properly declare the
762 * third argument to pcap_compile() as a const pointer. Cast
765 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
770 #ifdef HAVE_BPF_IMAGE
772 show_filter_code(capture_options *capture_opts)
774 interface_options interface_opts;
776 gchar open_err_str[PCAP_ERRBUF_SIZE];
777 char errmsg[MSG_MAX_LENGTH+1];
778 char secondary_errmsg[MSG_MAX_LENGTH+1];
779 struct bpf_program fcode;
780 struct bpf_insn *insn;
784 for (j = 0; j < capture_opts->ifaces->len; j++) {
785 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
786 pcap_h = open_capture_device(&interface_opts, &open_err_str);
787 if (pcap_h == NULL) {
788 /* Open failed; get messages */
789 get_capture_device_open_failure_messages(open_err_str,
791 errmsg, sizeof errmsg,
793 sizeof secondary_errmsg);
794 /* And report them */
795 report_capture_error(errmsg, secondary_errmsg);
799 /* Set the link-layer type. */
800 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
801 errmsg, sizeof errmsg,
802 secondary_errmsg, sizeof secondary_errmsg)) {
804 report_capture_error(errmsg, secondary_errmsg);
808 /* OK, try to compile the capture filter. */
809 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
810 interface_opts.cfilter)) {
812 report_cfilter_error(capture_opts, j, errmsg);
817 /* Now print the filter code. */
818 insn = fcode.bf_insns;
820 for (i = 0; i < fcode.bf_len; insn++, i++)
821 printf("%s\n", bpf_image(insn, i));
823 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
824 /* to remove any suid privileges. */
825 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
826 /* (euid/egid have already previously been set to ruid/rgid. */
827 /* (See comment in main() for details) */
829 relinquish_special_privs_perm();
831 relinquish_all_capabilities();
834 /* Let our parent know we succeeded. */
835 pipe_write_block(2, SP_SUCCESS, NULL);
842 * capture_interface_list() is expected to do the right thing to get
843 * a list of interfaces.
845 * In most of the programs in the Wireshark suite, "the right thing"
846 * is to run dumpcap and ask it for the list, because dumpcap may
847 * be the only program in the suite with enough privileges to get
850 * In dumpcap itself, however, we obviously can't run dumpcap to
851 * ask for the list. Therefore, our capture_interface_list() should
852 * just call get_interface_list().
855 capture_interface_list(int *err, char **err_str)
857 return get_interface_list(err, err_str);
861 * Get the data-link type for a libpcap device.
862 * This works around AIX 5.x's non-standard and incompatible-with-the-
863 * rest-of-the-universe libpcap.
866 get_pcap_linktype(pcap_t *pch, const char *devname
874 const char *ifacename;
877 linktype = pcap_datalink(pch);
881 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
882 * rather than DLT_ values for link-layer types; the ifType values
883 * for LAN devices are:
890 * and the ifType value for a loopback device is 24.
892 * The AIX names for LAN devices begin with:
899 * and the AIX names for loopback devices begin with "lo".
901 * (The difference between "Ethernet" and "802.3" is presumably
902 * whether packets have an Ethernet header, with a packet type,
903 * or an 802.3 header, with a packet length, followed by an 802.2
904 * header and possibly a SNAP header.)
906 * If the device name matches "linktype" interpreted as an ifType
907 * value, rather than as a DLT_ value, we will assume this is AIX's
908 * non-standard, incompatible libpcap, rather than a standard libpcap,
909 * and will map the link-layer type to the standard DLT_ value for
910 * that link-layer type, as that's what the rest of Wireshark expects.
912 * (This means the capture files won't be readable by a tcpdump
913 * linked with AIX's non-standard libpcap, but so it goes. They
914 * *will* be readable by standard versions of tcpdump, Wireshark,
917 * XXX - if we conclude we're using AIX libpcap, should we also
918 * set a flag to cause us to assume the time stamps are in
919 * seconds-and-nanoseconds form, and to convert them to
920 * seconds-and-microseconds form before processing them and
925 * Find the last component of the device name, which is the
928 ifacename = strchr(devname, '/');
929 if (ifacename == NULL)
932 /* See if it matches any of the LAN device names. */
933 if (strncmp(ifacename, "en", 2) == 0) {
936 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
940 } else if (strncmp(ifacename, "et", 2) == 0) {
943 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
944 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
949 } else if (strncmp(ifacename, "tr", 2) == 0) {
952 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
953 * DLT_IEEE802, which is what's used for Token Ring.
957 } else if (strncmp(ifacename, "fi", 2) == 0) {
958 if (linktype == 15) {
960 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
964 } else if (strncmp(ifacename, "lo", 2) == 0) {
965 if (linktype == 24) {
967 * That's the RFC 1573 value for "software loopback" devices; map it
968 * to DLT_NULL, which is what's used for loopback devices on BSD.
978 static data_link_info_t *
979 create_data_link_info(int dlt)
981 data_link_info_t *data_link_info;
984 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
985 data_link_info->dlt = dlt;
986 text = pcap_datalink_val_to_name(dlt);
988 data_link_info->name = g_strdup(text);
990 data_link_info->name = g_strdup_printf("DLT %d", dlt);
991 text = pcap_datalink_val_to_description(dlt);
993 data_link_info->description = g_strdup(text);
995 data_link_info->description = NULL;
996 return data_link_info;
1000 * Get the capabilities of a network device.
1002 static if_capabilities_t *
1003 get_if_capabilities(const char *devname, gboolean monitor_mode
1004 #ifndef HAVE_PCAP_CREATE
1009 if_capabilities_t *caps;
1010 char errbuf[PCAP_ERRBUF_SIZE];
1012 #ifdef HAVE_PCAP_CREATE
1016 #ifdef HAVE_PCAP_LIST_DATALINKS
1020 data_link_info_t *data_link_info;
1023 * Allocate the interface capabilities structure.
1025 caps = g_malloc(sizeof *caps);
1027 #ifdef HAVE_PCAP_OPEN
1028 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1029 caps->can_set_rfmon = FALSE;
1031 if (err_str != NULL)
1032 *err_str = g_strdup(errbuf);
1036 #elif defined(HAVE_PCAP_CREATE)
1037 pch = pcap_create(devname, errbuf);
1039 if (err_str != NULL)
1040 *err_str = g_strdup(errbuf);
1044 status = pcap_can_set_rfmon(pch);
1047 if (status == PCAP_ERROR)
1048 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1051 *err_str = g_strdup(pcap_statustostr(status));
1057 caps->can_set_rfmon = FALSE;
1058 else if (status == 1) {
1059 caps->can_set_rfmon = TRUE;
1061 pcap_set_rfmon(pch, 1);
1063 if (err_str != NULL) {
1064 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1072 status = pcap_activate(pch);
1074 /* Error. We ignore warnings (status > 0). */
1075 if (err_str != NULL) {
1076 if (status == PCAP_ERROR)
1077 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1080 *err_str = g_strdup(pcap_statustostr(status));
1087 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1088 caps->can_set_rfmon = FALSE;
1090 if (err_str != NULL)
1091 *err_str = g_strdup(errbuf);
1096 deflt = get_pcap_linktype(pch, devname);
1097 #ifdef HAVE_PCAP_LIST_DATALINKS
1098 nlt = pcap_list_datalinks(pch, &linktypes);
1099 if (nlt == 0 || linktypes == NULL) {
1101 if (err_str != NULL)
1102 *err_str = NULL; /* an empty list doesn't mean an error */
1105 caps->data_link_types = NULL;
1106 for (i = 0; i < nlt; i++) {
1107 data_link_info = create_data_link_info(linktypes[i]);
1110 * XXX - for 802.11, make the most detailed 802.11
1111 * version the default, rather than the one the
1112 * device has as the default?
1114 if (linktypes[i] == deflt)
1115 caps->data_link_types = g_list_prepend(caps->data_link_types,
1118 caps->data_link_types = g_list_append(caps->data_link_types,
1121 #ifdef HAVE_PCAP_FREE_DATALINKS
1122 pcap_free_datalinks(linktypes);
1125 * In Windows, there's no guarantee that if you have a library
1126 * built with one version of the MSVC++ run-time library, and
1127 * it returns a pointer to allocated data, you can free that
1128 * data from a program linked with another version of the
1129 * MSVC++ run-time library.
1131 * This is not an issue on UN*X.
1133 * See the mail threads starting at
1135 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1139 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1142 #define xx_free free /* hack so checkAPIs doesn't complain */
1145 #endif /* HAVE_PCAP_FREE_DATALINKS */
1146 #else /* HAVE_PCAP_LIST_DATALINKS */
1148 data_link_info = create_data_link_info(deflt);
1149 caps->data_link_types = g_list_append(caps->data_link_types,
1151 #endif /* HAVE_PCAP_LIST_DATALINKS */
1155 if (err_str != NULL)
1160 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1162 print_machine_readable_interfaces(GList *if_list)
1169 char addr_str[ADDRSTRLEN];
1171 if (capture_child) {
1172 /* Let our parent know we succeeded. */
1173 pipe_write_block(2, SP_SUCCESS, NULL);
1176 i = 1; /* Interface id number */
1177 for (if_entry = g_list_first(if_list); if_entry != NULL;
1178 if_entry = g_list_next(if_entry)) {
1179 if_info = (if_info_t *)if_entry->data;
1180 printf("%d. %s", i++, if_info->name);
1183 * Print the contents of the if_entry struct in a parseable format.
1184 * Each if_entry element is tab-separated. Addresses are comma-
1187 /* XXX - Make sure our description doesn't contain a tab */
1188 if (if_info->description != NULL)
1189 printf("\t%s\t", if_info->description);
1193 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1194 addr = g_slist_next(addr)) {
1195 if (addr != g_slist_nth(if_info->addrs, 0))
1198 if_addr = (if_addr_t *)addr->data;
1199 switch(if_addr->ifat_type) {
1201 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1203 printf("%s", addr_str);
1205 printf("<unknown IPv4>");
1209 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1210 addr_str, ADDRSTRLEN)) {
1211 printf("%s", addr_str);
1213 printf("<unknown IPv6>");
1217 printf("<type unknown %u>", if_addr->ifat_type);
1221 if (if_info->loopback)
1222 printf("\tloopback");
1224 printf("\tnetwork");
1231 * If you change the machine-readable output format of this function,
1232 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1235 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1238 data_link_info_t *data_link_info;
1239 const gchar *desc_str;
1241 if (capture_child) {
1242 /* Let our parent know we succeeded. */
1243 pipe_write_block(2, SP_SUCCESS, NULL);
1246 if (caps->can_set_rfmon)
1250 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1251 lt_entry = g_list_next(lt_entry)) {
1252 data_link_info = (data_link_info_t *)lt_entry->data;
1253 if (data_link_info->description != NULL)
1254 desc_str = data_link_info->description;
1256 desc_str = "(not supported)";
1257 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1267 /* Print the number of packets captured for each interface until we're killed. */
1269 print_statistics_loop(gboolean machine_readable)
1271 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1277 char errbuf[PCAP_ERRBUF_SIZE];
1278 struct pcap_stat ps;
1280 if_list = get_interface_list(&err, &err_str);
1281 if (if_list == NULL) {
1283 case CANT_GET_INTERFACE_LIST:
1284 cmdarg_err("%s", err_str);
1288 case NO_INTERFACES_FOUND:
1289 cmdarg_err("There are no interfaces on which a capture can be done");
1295 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1296 if_info = (if_info_t *)if_entry->data;
1297 #ifdef HAVE_PCAP_OPEN
1298 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1300 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1304 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1305 if_stat->name = g_strdup(if_info->name);
1307 stat_list = g_list_append(stat_list, if_stat);
1312 cmdarg_err("There are no interfaces on which a capture can be done");
1316 if (capture_child) {
1317 /* Let our parent know we succeeded. */
1318 pipe_write_block(2, SP_SUCCESS, NULL);
1321 if (!machine_readable) {
1322 printf("%-15s %10s %10s\n", "Interface", "Received",
1326 global_ld.go = TRUE;
1327 while (global_ld.go) {
1328 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1329 if_stat = (if_stat_t *)stat_entry->data;
1330 pcap_stats(if_stat->pch, &ps);
1332 if (!machine_readable) {
1333 printf("%-15s %10u %10u\n", if_stat->name,
1334 ps.ps_recv, ps.ps_drop);
1336 printf("%s\t%u\t%u\n", if_stat->name,
1337 ps.ps_recv, ps.ps_drop);
1348 /* XXX - Not reached. Should we look for 'q' in stdin? */
1349 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1350 if_stat = (if_stat_t *)stat_entry->data;
1351 pcap_close(if_stat->pch);
1352 g_free(if_stat->name);
1355 g_list_free(stat_list);
1356 free_interface_list(if_list);
1364 capture_cleanup_handler(DWORD dwCtrlType)
1366 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1367 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1368 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1369 like SIGTERM at least when the machine's shutting down.
1371 For now, if we're running as a command rather than a capture child,
1372 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1373 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1374 in that way on UN*X.
1376 If we're not running as a capture child, we might be running as
1377 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1378 user logs out. (XXX - can we explicitly check whether we're
1379 running as a service?) */
1381 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1382 "Console: Control signal");
1383 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1384 "Console: Control signal, CtrlType: %u", dwCtrlType);
1386 /* Keep capture running if we're a service and a user logs off */
1387 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1388 capture_loop_stop();
1396 capture_cleanup_handler(int signum _U_)
1398 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1399 SIGTERM. We assume that if the user wanted it to keep running
1400 after they logged out, they'd have nohupped it. */
1402 /* Note: don't call g_log() in the signal handler: if we happened to be in
1403 * g_log() in process context when the signal came in, g_log will detect
1404 * the "recursion" and abort.
1407 capture_loop_stop();
1413 report_capture_count(gboolean reportit)
1415 /* Don't print this if we're a capture child. */
1416 if (!capture_child && reportit) {
1417 fprintf(stderr, "\rPackets captured: %u\n", global_ld.packet_count);
1418 /* stderr could be line buffered */
1426 report_counts_for_siginfo(void)
1428 report_capture_count(quiet);
1429 infoprint = FALSE; /* we just reported it */
1433 report_counts_siginfo(int signum _U_)
1435 int sav_errno = errno;
1437 /* If we've been told to delay printing, just set a flag asking
1438 that we print counts (if we're supposed to), otherwise print
1439 the count of packets captured (if we're supposed to). */
1443 report_counts_for_siginfo();
1446 #endif /* SIGINFO */
1449 exit_main(int status)
1452 /* Shutdown windows sockets */
1455 /* can be helpful for debugging */
1456 #ifdef DEBUG_DUMPCAP
1457 printf("Press any key\n");
1468 * If we were linked with libcap (not libpcap), make sure we have
1469 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1470 * (See comment in main() for details)
1473 relinquish_privs_except_capture(void)
1475 /* If 'started_with_special_privs' (ie: suid) then enable for
1476 * ourself the NET_ADMIN and NET_RAW capabilities and then
1477 * drop our suid privileges.
1479 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1480 * stuff we don't need (and shouldn't have).
1481 * CAP_NET_RAW: Packet capture (raw sockets).
1484 if (started_with_special_privs()) {
1485 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1486 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1488 cap_t caps = cap_init(); /* all capabilities initialized to off */
1490 print_caps("Pre drop, pre set");
1492 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1493 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1496 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1497 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1499 if (cap_set_proc(caps)) {
1500 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1502 print_caps("Pre drop, post set");
1504 relinquish_special_privs_perm();
1506 print_caps("Post drop, pre set");
1507 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1508 if (cap_set_proc(caps)) {
1509 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1511 print_caps("Post drop, post set");
1517 #endif /* HAVE_LIBCAP */
1519 /* Take care of byte order in the libpcap headers read from pipes.
1520 * (function taken from wiretap/libpcap.c) */
1522 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1525 /* Byte-swap the record header fields. */
1526 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1527 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1528 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1529 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1532 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1533 swapped, in order to match the BPF header layout.
1535 Unfortunately, some files were, according to a comment in the "libpcap"
1536 source, written with version 2.3 in their headers but without the
1537 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1538 would make no sense - we assume that we need to swap them. */
1539 if (hdr->version_major == 2 &&
1540 (hdr->version_minor < 3 ||
1541 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1544 temp = rechdr->orig_len;
1545 rechdr->orig_len = rechdr->incl_len;
1546 rechdr->incl_len = temp;
1550 #if defined(USE_THREADS) && defined(_WIN32)
1552 * Thread function that reads from a pipe and pushes the data
1553 * to the main application thread.
1556 * XXX Right now we use async queues for basic signaling. The main thread
1557 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1558 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1559 * Iff the read is successful cap_pipe_read pushes an item onto
1560 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1561 * the queues themselves (yet).
1563 * We might want to move some of the cap_pipe_dispatch logic here so that
1564 * we can let cap_pipe_read run independently, queuing up multiple reads
1565 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1567 static void *cap_pipe_read(void *arg)
1569 pcap_options *pcap_opts;
1578 pcap_opts = (pcap_options *)arg;
1579 while (pcap_opts->cap_pipe_err == PIPOK) {
1580 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1581 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1583 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1585 /* If we try to use read() on a named pipe on Windows with partial
1586 * data it appears to return EOF.
1588 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1589 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1594 last_err = GetLastError();
1595 if (last_err == ERROR_MORE_DATA) {
1597 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1598 pcap_opts->cap_pipe_err = PIPEOF;
1602 pcap_opts->cap_pipe_err = PIPERR;
1605 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1606 pcap_opts->cap_pipe_err = PIPEOF;
1611 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1612 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1615 pcap_opts->cap_pipe_err = PIPEOF;
1619 pcap_opts->cap_pipe_err = PIPERR;
1628 pcap_opts->cap_pipe_bytes_read = bytes_read;
1629 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1630 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1632 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1638 #if (!(defined(USE_THREADS) && defined(_WIN32))) || defined(MUST_DO_SELECT)
1639 /* Provide select() functionality for a single file descriptor
1640 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1642 * Returns the same values as select.
1645 cap_pipe_select(int pipe_fd)
1648 struct timeval timeout;
1651 FD_SET(pipe_fd, &rfds);
1653 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1654 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1656 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1661 /* Mimic pcap_open_live() for pipe captures
1663 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1664 * open it, and read the header.
1666 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1667 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1669 cap_pipe_open_live(char *pipename,
1670 pcap_options *pcap_opts,
1671 struct pcap_hdr *hdr,
1672 char *errmsg, int errmsgl)
1675 ws_statb64 pipe_stat;
1676 struct sockaddr_un sa;
1685 #if !(defined(USE_THREADS) && defined(_WIN32))
1687 unsigned int bytes_read;
1692 pcap_opts->cap_pipe_fd = -1;
1694 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1696 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1699 * XXX - this blocks until a pcap per-file header has been written to
1700 * the pipe, so it could block indefinitely.
1702 if (strcmp(pipename, "-") == 0) {
1704 fd = 0; /* read from stdin */
1706 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1710 if (ws_stat64(pipename, &pipe_stat) < 0) {
1711 if (errno == ENOENT || errno == ENOTDIR)
1712 pcap_opts->cap_pipe_err = PIPNEXIST;
1714 g_snprintf(errmsg, errmsgl,
1715 "The capture session could not be initiated "
1716 "due to error getting information on pipe/socket: %s", g_strerror(errno));
1717 pcap_opts->cap_pipe_err = PIPERR;
1721 if (S_ISFIFO(pipe_stat.st_mode)) {
1722 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1724 g_snprintf(errmsg, errmsgl,
1725 "The capture session could not be initiated "
1726 "due to error on pipe open: %s", g_strerror(errno));
1727 pcap_opts->cap_pipe_err = PIPERR;
1730 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1731 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1733 g_snprintf(errmsg, errmsgl,
1734 "The capture session could not be initiated "
1735 "due to error on socket create: %s", g_strerror(errno));
1736 pcap_opts->cap_pipe_err = PIPERR;
1739 sa.sun_family = AF_UNIX;
1741 * The Single UNIX Specification says:
1743 * The size of sun_path has intentionally been left undefined.
1744 * This is because different implementations use different sizes.
1745 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1746 * of 104. Since most implementations originate from BSD versions,
1747 * the size is typically in the range 92 to 108.
1749 * Applications should not assume a particular length for sun_path
1750 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1754 * The <sys/un.h> header shall define the sockaddr_un structure,
1755 * which shall include at least the following members:
1757 * sa_family_t sun_family Address family.
1758 * char sun_path[] Socket pathname.
1760 * so we assume that it's an array, with a specified size,
1761 * and that the size reflects the maximum path length.
1763 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1764 /* Path name too long */
1765 g_snprintf(errmsg, errmsgl,
1766 "The capture session coud not be initiated "
1767 "due to error on socket connect: Path name too long");
1768 pcap_opts->cap_pipe_err = PIPERR;
1771 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1773 g_snprintf(errmsg, errmsgl,
1774 "The capture session coud not be initiated "
1775 "due to error on socket connect: %s", g_strerror(errno));
1776 pcap_opts->cap_pipe_err = PIPERR;
1780 if (S_ISCHR(pipe_stat.st_mode)) {
1782 * Assume the user specified an interface on a system where
1783 * interfaces are in /dev. Pretend we haven't seen it.
1785 pcap_opts->cap_pipe_err = PIPNEXIST;
1788 g_snprintf(errmsg, errmsgl,
1789 "The capture session could not be initiated because\n"
1790 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1791 pcap_opts->cap_pipe_err = PIPERR;
1796 #define PIPE_STR "\\pipe\\"
1797 /* Under Windows, named pipes _must_ have the form
1798 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1800 pncopy = g_strdup(pipename);
1801 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1802 pos = strchr(pncopy + 3, '\\');
1803 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1810 g_snprintf(errmsg, errmsgl,
1811 "The capture session could not be initiated because\n"
1812 "\"%s\" is neither an interface nor a pipe", pipename);
1813 pcap_opts->cap_pipe_err = PIPNEXIST;
1817 /* Wait for the pipe to appear */
1819 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1820 OPEN_EXISTING, 0, NULL);
1822 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1825 if (GetLastError() != ERROR_PIPE_BUSY) {
1826 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1827 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1828 g_snprintf(errmsg, errmsgl,
1829 "The capture session on \"%s\" could not be started "
1830 "due to error on pipe open: %s (error %d)",
1831 pipename, utf_16to8(err_str), GetLastError());
1833 pcap_opts->cap_pipe_err = PIPERR;
1837 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1838 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1839 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1840 g_snprintf(errmsg, errmsgl,
1841 "The capture session on \"%s\" timed out during "
1842 "pipe open: %s (error %d)",
1843 pipename, utf_16to8(err_str), GetLastError());
1845 pcap_opts->cap_pipe_err = PIPERR;
1852 pcap_opts->from_cap_pipe = TRUE;
1854 #if !(defined(USE_THREADS) && defined(_WIN32))
1855 /* read the pcap header */
1857 while (bytes_read < sizeof magic) {
1858 sel_ret = cap_pipe_select(fd);
1860 g_snprintf(errmsg, errmsgl,
1861 "Unexpected error from select: %s", g_strerror(errno));
1863 } else if (sel_ret > 0) {
1864 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1867 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1869 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1877 g_thread_create(&cap_pipe_read, pcap_opts, FALSE, NULL);
1879 pcap_opts->cap_pipe_buf = (char *) &magic;
1880 pcap_opts->cap_pipe_bytes_read = 0;
1881 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1882 /* We don't have to worry about cap_pipe_read_mtx here */
1883 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1884 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1885 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1886 if (pcap_opts->cap_pipe_bytes_read == 0)
1887 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1889 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1898 /* Host that wrote it has our byte order, and was running
1899 a program using either standard or ss990417 libpcap. */
1900 pcap_opts->cap_pipe_byte_swapped = FALSE;
1901 pcap_opts->cap_pipe_modified = FALSE;
1903 case PCAP_MODIFIED_MAGIC:
1904 /* Host that wrote it has our byte order, but was running
1905 a program using either ss990915 or ss991029 libpcap. */
1906 pcap_opts->cap_pipe_byte_swapped = FALSE;
1907 pcap_opts->cap_pipe_modified = TRUE;
1909 case PCAP_SWAPPED_MAGIC:
1910 /* Host that wrote it has a byte order opposite to ours,
1911 and was running a program using either standard or
1912 ss990417 libpcap. */
1913 pcap_opts->cap_pipe_byte_swapped = TRUE;
1914 pcap_opts->cap_pipe_modified = FALSE;
1916 case PCAP_SWAPPED_MODIFIED_MAGIC:
1917 /* Host that wrote it out has a byte order opposite to
1918 ours, and was running a program using either ss990915
1919 or ss991029 libpcap. */
1920 pcap_opts->cap_pipe_byte_swapped = TRUE;
1921 pcap_opts->cap_pipe_modified = TRUE;
1924 /* Not a "libpcap" type we know about. */
1925 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1929 #if !(defined(USE_THREADS) && defined(_WIN32))
1930 /* Read the rest of the header */
1932 while (bytes_read < sizeof(struct pcap_hdr)) {
1933 sel_ret = cap_pipe_select(fd);
1935 g_snprintf(errmsg, errmsgl,
1936 "Unexpected error from select: %s", g_strerror(errno));
1938 } else if (sel_ret > 0) {
1939 b = read(fd, ((char *)hdr)+bytes_read,
1940 sizeof(struct pcap_hdr) - bytes_read);
1943 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1945 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1953 pcap_opts->cap_pipe_buf = (char *) hdr;
1954 pcap_opts->cap_pipe_bytes_read = 0;
1955 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1956 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1957 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1958 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1959 if (pcap_opts->cap_pipe_bytes_read == 0)
1960 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1962 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1968 if (pcap_opts->cap_pipe_byte_swapped) {
1969 /* Byte-swap the header fields about which we care. */
1970 hdr->version_major = BSWAP16(hdr->version_major);
1971 hdr->version_minor = BSWAP16(hdr->version_minor);
1972 hdr->snaplen = BSWAP32(hdr->snaplen);
1973 hdr->network = BSWAP32(hdr->network);
1975 pcap_opts->linktype = hdr->network;
1977 if (hdr->version_major < 2) {
1978 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1982 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1983 pcap_opts->cap_pipe_err = PIPOK;
1985 pcap_opts->cap_pipe_fd = fd;
1990 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1991 pcap_opts->cap_pipe_err = PIPERR;
1994 pcap_opts->cap_pipe_fd = -1;
2001 /* We read one record from the pipe, take care of byte order in the record
2002 * header, write the record to the capture file, and update capture statistics. */
2004 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
2006 struct pcap_pkthdr phdr;
2007 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2009 #if defined(USE_THREADS) && defined(_WIN32)
2019 #ifdef LOG_CAPTURE_VERBOSE
2020 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2023 switch (pcap_opts->cap_pipe_state) {
2025 case STATE_EXPECT_REC_HDR:
2026 #if defined(USE_THREADS) && defined(_WIN32)
2027 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2030 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2031 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2032 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2033 pcap_opts->cap_pipe_bytes_read = 0;
2035 #if defined(USE_THREADS) && defined(_WIN32)
2036 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2037 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2038 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2043 case STATE_READ_REC_HDR:
2044 #if !(defined(USE_THREADS) && defined(_WIN32))
2045 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2046 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2049 result = PD_PIPE_EOF;
2051 result = PD_PIPE_ERR;
2054 pcap_opts->cap_pipe_bytes_read += b;
2056 g_get_current_time(&wait_time);
2057 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2058 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2059 if (pcap_opts->cap_pipe_err == PIPEOF) {
2060 result = PD_PIPE_EOF;
2062 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2063 result = PD_PIPE_ERR;
2070 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2072 result = PD_REC_HDR_READ;
2075 case STATE_EXPECT_DATA:
2076 #if defined(USE_THREADS) && defined(_WIN32)
2077 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2080 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2081 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2082 pcap_opts->cap_pipe_bytes_read = 0;
2084 #if defined(USE_THREADS) && defined(_WIN32)
2085 pcap_opts->cap_pipe_buf = (char *) data;
2086 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2087 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2092 case STATE_READ_DATA:
2093 #if !(defined(USE_THREADS) && defined(_WIN32))
2094 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2095 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2098 result = PD_PIPE_EOF;
2100 result = PD_PIPE_ERR;
2103 pcap_opts->cap_pipe_bytes_read += b;
2105 g_get_current_time(&wait_time);
2106 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2107 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2108 if (pcap_opts->cap_pipe_err == PIPEOF) {
2109 result = PD_PIPE_EOF;
2111 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2112 result = PD_PIPE_ERR;
2119 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2121 result = PD_DATA_READ;
2125 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2128 } /* switch (ld->cap_pipe_state) */
2131 * We've now read as much data as we were expecting, so process it.
2135 case PD_REC_HDR_READ:
2136 /* We've read the header. Take care of byte order. */
2137 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2138 &pcap_opts->cap_pipe_rechdr.hdr);
2139 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2140 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2141 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2145 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2146 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2149 /* no data to read? fall through */
2152 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2153 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2154 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2155 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2156 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2159 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2161 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2163 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2167 pcap_opts->cap_pipe_err = PIPEOF;
2172 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2173 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2174 g_snprintf(errmsg, errmsgl,
2175 "Error reading from pipe: %s (error %d)",
2176 utf_16to8(err_str), GetLastError());
2179 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2187 pcap_opts->cap_pipe_err = PIPERR;
2188 /* Return here rather than inside the switch to prevent GCC warning */
2193 /** Open the capture input file (pcap or capture pipe).
2194 * Returns TRUE if it succeeds, FALSE otherwise. */
2196 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2197 char *errmsg, size_t errmsg_len,
2198 char *secondary_errmsg, size_t secondary_errmsg_len)
2200 gchar open_err_str[PCAP_ERRBUF_SIZE];
2201 gchar *sync_msg_str;
2202 interface_options interface_opts;
2203 pcap_options *pcap_opts;
2207 gchar *sync_secondary_msg_str;
2208 WORD wVersionRequested;
2212 /* XXX - opening Winsock on tshark? */
2214 /* Initialize Windows Socket if we are in a WIN32 OS
2215 This needs to be done before querying the interface for network/netmask */
2217 /* XXX - do we really require 1.1 or earlier?
2218 Are there any versions that support only 2.0 or higher? */
2219 wVersionRequested = MAKEWORD(1, 1);
2220 err = WSAStartup(wVersionRequested, &wsaData);
2224 case WSASYSNOTREADY:
2225 g_snprintf(errmsg, (gulong) errmsg_len,
2226 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2229 case WSAVERNOTSUPPORTED:
2230 g_snprintf(errmsg, (gulong) errmsg_len,
2231 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2232 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2235 case WSAEINPROGRESS:
2236 g_snprintf(errmsg, (gulong) errmsg_len,
2237 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2241 g_snprintf(errmsg, (gulong) errmsg_len,
2242 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2246 g_snprintf(errmsg, (gulong) errmsg_len,
2247 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2251 g_snprintf(errmsg, (gulong) errmsg_len,
2252 "Couldn't initialize Windows Sockets: error %d", err);
2255 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2259 if ((use_threads == FALSE) &&
2260 (capture_opts->ifaces->len > 1)) {
2261 g_snprintf(errmsg, (gulong) errmsg_len,
2262 "Using threads is required for capturing on mulitple interfaces!");
2266 for (i = 0; i < capture_opts->ifaces->len; i++) {
2267 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2268 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2269 if (pcap_opts == NULL) {
2270 g_snprintf(errmsg, (gulong) errmsg_len,
2271 "Could not allocate memory.");
2274 pcap_opts->received = 0;
2275 pcap_opts->dropped = 0;
2276 pcap_opts->pcap_h = NULL;
2277 #ifdef MUST_DO_SELECT
2278 pcap_opts->pcap_fd = -1;
2280 pcap_opts->pcap_err = FALSE;
2281 pcap_opts->interface_id = i;
2282 pcap_opts->tid = NULL;
2283 pcap_opts->snaplen = 0;
2284 pcap_opts->linktype = -1;
2285 pcap_opts->from_cap_pipe = FALSE;
2286 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2287 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2289 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2291 pcap_opts->cap_pipe_fd = -1;
2293 pcap_opts->cap_pipe_modified = FALSE;
2294 pcap_opts->cap_pipe_byte_swapped = FALSE;
2295 #if defined(USE_THREADS) && defined(_WIN32)
2296 pcap_opts->cap_pipe_buf = NULL;
2298 pcap_opts->cap_pipe_bytes_to_read = 0;
2299 pcap_opts->cap_pipe_bytes_read = 0;
2300 pcap_opts->cap_pipe_state = 0;
2301 pcap_opts->cap_pipe_err = PIPOK;
2302 #if defined(USE_THREADS) && defined(_WIN32)
2303 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2304 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2305 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2307 g_array_append_val(ld->pcaps, pcap_opts);
2309 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2310 pcap_opts->pcap_h = open_capture_device(&interface_opts, &open_err_str);
2312 if (pcap_opts->pcap_h != NULL) {
2313 /* we've opened "iface" as a network device */
2315 /* try to set the capture buffer size */
2316 if (interface_opts.buffer_size > 1 &&
2317 pcap_setbuff(pcap_opts->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2318 sync_secondary_msg_str = g_strdup_printf(
2319 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2320 "the default of 1MB will be used.\n"
2322 "Nonetheless, the capture is started.\n",
2323 interface_opts.buffer_size);
2324 report_capture_error("Couldn't set the capture buffer size!",
2325 sync_secondary_msg_str);
2326 g_free(sync_secondary_msg_str);
2330 #if defined(HAVE_PCAP_SETSAMPLING)
2331 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2332 struct pcap_samp *samp;
2334 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2335 switch (interface_opts.sampling_method) {
2336 case CAPTURE_SAMP_BY_COUNT:
2337 samp->method = PCAP_SAMP_1_EVERY_N;
2340 case CAPTURE_SAMP_BY_TIMER:
2341 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2345 sync_msg_str = g_strdup_printf(
2346 "Unknown sampling method %d specified,\n"
2347 "continue without packet sampling",
2348 interface_opts.sampling_method);
2349 report_capture_error("Couldn't set the capture "
2350 "sampling", sync_msg_str);
2351 g_free(sync_msg_str);
2353 samp->value = interface_opts.sampling_param;
2355 report_capture_error("Couldn't set the capture sampling",
2356 "Cannot get packet sampling data structure");
2361 /* setting the data link type only works on real interfaces */
2362 if (!set_pcap_linktype(pcap_opts->pcap_h, interface_opts.linktype, interface_opts.name,
2364 secondary_errmsg, secondary_errmsg_len)) {
2367 pcap_opts->linktype = get_pcap_linktype(pcap_opts->pcap_h, interface_opts.name);
2369 /* We couldn't open "iface" as a network device. */
2370 /* Try to open it as a pipe */
2371 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2374 if (pcap_opts->cap_pipe_fd == -1) {
2376 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2378 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2379 /* Pipe doesn't exist, so output message for interface */
2380 get_capture_device_open_failure_messages(open_err_str,
2381 interface_opts.name,
2385 secondary_errmsg_len);
2388 * Else pipe (or file) does exist and cap_pipe_open_live() has
2393 /* cap_pipe_open_live() succeeded; don't want
2394 error message from pcap_open_live() */
2395 open_err_str[0] = '\0';
2399 /* XXX - will this work for tshark? */
2400 #ifdef MUST_DO_SELECT
2401 if (!pcap_opts->from_cap_pipe) {
2402 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2403 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2405 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2410 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2411 returned a warning; print it, but keep capturing. */
2412 if (open_err_str[0] != '\0') {
2413 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2414 report_capture_error(sync_msg_str, "");
2415 g_free(sync_msg_str);
2417 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2418 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2421 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2422 /* to remove any suid privileges. */
2423 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2424 /* (euid/egid have already previously been set to ruid/rgid. */
2425 /* (See comment in main() for details) */
2427 relinquish_special_privs_perm();
2429 relinquish_all_capabilities();
2434 /* close the capture input file (pcap or capture pipe) */
2435 static void capture_loop_close_input(loop_data *ld)
2438 pcap_options *pcap_opts;
2440 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2442 for (i = 0; i < ld->pcaps->len; i++) {
2443 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2444 /* if open, close the capture pipe "input file" */
2446 if (pcap_opts->cap_pipe_fd >= 0) {
2447 g_assert(pcap_opts->from_cap_pipe);
2448 ws_close(pcap_opts->cap_pipe_fd);
2449 pcap_opts->cap_pipe_fd = -1;
2452 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2453 CloseHandle(pcap_opts->cap_pipe_h);
2454 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2457 /* if open, close the pcap "input file" */
2458 if (pcap_opts->pcap_h != NULL) {
2459 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2460 pcap_close(pcap_opts->pcap_h);
2461 pcap_opts->pcap_h = NULL;
2468 /* Shut down windows sockets */
2474 /* init the capture filter */
2475 static initfilter_status_t
2476 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2477 const gchar * name, const gchar * cfilter)
2479 struct bpf_program fcode;
2481 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2483 /* capture filters only work on real interfaces */
2484 if (cfilter && !from_cap_pipe) {
2485 /* A capture filter was specified; set it up. */
2486 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2487 /* Treat this specially - our caller might try to compile this
2488 as a display filter and, if that succeeds, warn the user that
2489 the display and capture filter syntaxes are different. */
2490 return INITFILTER_BAD_FILTER;
2492 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2493 #ifdef HAVE_PCAP_FREECODE
2494 pcap_freecode(&fcode);
2496 return INITFILTER_OTHER_ERROR;
2498 #ifdef HAVE_PCAP_FREECODE
2499 pcap_freecode(&fcode);
2503 return INITFILTER_NO_ERROR;
2507 /* set up to write to the already-opened capture output file/files */
2509 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2513 pcap_options *pcap_opts;
2514 interface_options interface_opts;
2515 gboolean successful;
2517 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2519 if ((capture_opts->use_pcapng == FALSE) &&
2520 (capture_opts->ifaces->len > 1)) {
2521 g_snprintf(errmsg, errmsg_len,
2522 "Using PCAPNG is required for capturing on mulitple interfaces! Use the -n option.");
2526 /* Set up to write to the capture file. */
2527 if (capture_opts->multi_files_on) {
2528 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2530 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2533 if (capture_opts->use_pcapng) {
2536 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2537 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err);
2538 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2539 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2540 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2541 if (pcap_opts->from_cap_pipe) {
2542 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2544 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2546 successful = libpcap_write_interface_description_block(ld->pdh,
2547 interface_opts.name,
2548 interface_opts.cfilter?interface_opts.cfilter:"",
2549 pcap_opts->linktype,
2555 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2556 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2557 if (pcap_opts->from_cap_pipe) {
2558 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2560 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2562 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2563 &ld->bytes_written, &err);
2571 if (ld->pdh == NULL) {
2572 /* We couldn't set up to write to the capture file. */
2573 /* XXX - use cf_open_error_message from tshark instead? */
2578 g_snprintf(errmsg, errmsg_len,
2579 "The file to which the capture would be"
2580 " saved (\"%s\") could not be opened: Error %d.",
2581 capture_opts->save_file, err);
2583 g_snprintf(errmsg, errmsg_len,
2584 "The file to which the capture would be"
2585 " saved (\"%s\") could not be opened: %s.",
2586 capture_opts->save_file, g_strerror(err));
2598 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2602 pcap_options *pcap_opts;
2604 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2606 if (capture_opts->multi_files_on) {
2607 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2609 if (capture_opts->use_pcapng) {
2610 for (i = 0; i < global_ld.pcaps->len; i++) {
2611 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2612 if (!pcap_opts->from_cap_pipe) {
2613 libpcap_write_interface_statistics_block(ld->pdh, i, pcap_opts->pcap_h, &ld->bytes_written, err_close);
2617 return libpcap_dump_close(ld->pdh, err_close);
2621 /* dispatch incoming packets (pcap or capture pipe)
2623 * Waits for incoming packets to be available, and calls pcap_dispatch()
2624 * to cause them to be processed.
2626 * Returns the number of packets which were processed.
2628 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2629 * packet-batching behaviour does not cause packets to get held back
2633 capture_loop_dispatch(loop_data *ld,
2634 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2637 gint packet_count_before;
2638 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2639 #if !(defined(USE_THREADS) && defined(_WIN32))
2643 packet_count_before = ld->packet_count;
2644 if (pcap_opts->from_cap_pipe) {
2645 /* dispatch from capture pipe */
2646 #ifdef LOG_CAPTURE_VERBOSE
2647 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2649 #if !(defined(USE_THREADS) && defined(_WIN32))
2650 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2652 if (sel_ret < 0 && errno != EINTR) {
2653 g_snprintf(errmsg, errmsg_len,
2654 "Unexpected error from select: %s", g_strerror(errno));
2655 report_capture_error(errmsg, please_report);
2660 * "select()" says we can read from the pipe without blocking
2663 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2667 #if !(defined(USE_THREADS) && defined(_WIN32))
2673 /* dispatch from pcap */
2674 #ifdef MUST_DO_SELECT
2676 * If we have "pcap_get_selectable_fd()", we use it to get the
2677 * descriptor on which to select; if that's -1, it means there
2678 * is no descriptor on which you can do a "select()" (perhaps
2679 * because you're capturing on a special device, and that device's
2680 * driver unfortunately doesn't support "select()", in which case
2681 * we don't do the select - which means it might not be possible
2682 * to stop a capture until a packet arrives. If that's unacceptable,
2683 * plead with whoever supplies the software for that device to add
2684 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2685 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2686 * later, so it can use pcap_breakloop().
2688 #ifdef LOG_CAPTURE_VERBOSE
2689 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2691 if (pcap_opts->pcap_fd != -1) {
2692 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2695 * "select()" says we can read from it without blocking; go for
2698 * We don't have pcap_breakloop(), so we only process one packet
2699 * per pcap_dispatch() call, to allow a signal to stop the
2700 * processing immediately, rather than processing all packets
2701 * in a batch before quitting.
2704 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2706 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2710 /* Error, rather than pcap_breakloop(). */
2711 pcap_opts->pcap_err = TRUE;
2713 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2716 if (sel_ret < 0 && errno != EINTR) {
2717 g_snprintf(errmsg, errmsg_len,
2718 "Unexpected error from select: %s", g_strerror(errno));
2719 report_capture_error(errmsg, please_report);
2725 #endif /* MUST_DO_SELECT */
2727 /* dispatch from pcap without select */
2729 #ifdef LOG_CAPTURE_VERBOSE
2730 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2734 * On Windows, we don't support asynchronously telling a process to
2735 * stop capturing; instead, we check for an indication on a pipe
2736 * after processing packets. We therefore process only one packet
2737 * at a time, so that we can check the pipe after every packet.
2740 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2742 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2746 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2748 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2753 /* Error, rather than pcap_breakloop(). */
2754 pcap_opts->pcap_err = TRUE;
2756 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2758 #else /* pcap_next_ex */
2759 #ifdef LOG_CAPTURE_VERBOSE
2760 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2762 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2765 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2766 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2767 * This should be fixed in the WinPcap 4.0 alpha release.
2769 * For reference, an example remote interface:
2770 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2773 /* emulate dispatch from pcap */
2776 struct pcap_pkthdr *pkt_header;
2781 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2783 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2785 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2790 pcap_opts->pcap_err = TRUE;
2794 #endif /* pcap_next_ex */
2798 #ifdef LOG_CAPTURE_VERBOSE
2799 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2802 return ld->packet_count - packet_count_before;
2806 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2807 * want to grab only the characters between the '{' and '}' delimiters.
2809 * Returns a GString that must be freed with g_string_free(). */
2811 isolate_uuid(const char *iface)
2816 ptr = strchr(iface, '{');
2818 return g_string_new(iface);
2819 gstr = g_string_new(ptr + 1);
2821 ptr = strchr(gstr->str, '}');
2825 gstr = g_string_truncate(gstr, ptr - gstr->str);
2830 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2831 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2833 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2834 char *errmsg, int errmsg_len)
2837 gchar *capfile_name;
2839 gboolean is_tempfile;
2841 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2842 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2844 if (capture_opts->save_file != NULL) {
2845 /* We return to the caller while the capture is in progress.
2846 * Therefore we need to take a copy of save_file in
2847 * case the caller destroys it after we return.
2849 capfile_name = g_strdup(capture_opts->save_file);
2851 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2852 if (capture_opts->multi_files_on) {
2853 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2854 g_snprintf(errmsg, errmsg_len,
2855 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2856 g_free(capfile_name);
2859 if (strcmp(capfile_name, "-") == 0) {
2860 /* write to stdout */
2863 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2864 _setmode(1, O_BINARY);
2867 } /* if (...output_to_pipe ... */
2870 if (capture_opts->multi_files_on) {
2871 /* ringbuffer is enabled */
2872 *save_file_fd = ringbuf_init(capfile_name,
2873 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2874 capture_opts->group_read_access);
2876 /* we need the ringbuf name */
2877 if(*save_file_fd != -1) {
2878 g_free(capfile_name);
2879 capfile_name = g_strdup(ringbuf_current_filename());
2882 /* Try to open/create the specified file for use as a capture buffer. */
2883 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2884 (capture_opts->group_read_access) ? 0640 : 0600);
2887 is_tempfile = FALSE;
2889 /* Choose a random name for the temporary capture buffer */
2890 if (global_capture_opts.ifaces->len > 1) {
2891 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
2896 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
2897 basename = g_path_get_basename(iface->str);
2898 g_string_free(iface, TRUE);
2900 basename = g_path_get_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
2902 prefix = g_strconcat("wireshark_", basename, NULL);
2905 *save_file_fd = create_tempfile(&tmpname, prefix);
2907 capfile_name = g_strdup(tmpname);
2911 /* did we fail to open the output file? */
2912 if (*save_file_fd == -1) {
2914 g_snprintf(errmsg, errmsg_len,
2915 "The temporary file to which the capture would be saved (\"%s\") "
2916 "could not be opened: %s.", capfile_name, g_strerror(errno));
2918 if (capture_opts->multi_files_on) {
2919 ringbuf_error_cleanup();
2922 g_snprintf(errmsg, errmsg_len,
2923 "The file to which the capture would be saved (\"%s\") "
2924 "could not be opened: %s.", capfile_name,
2927 g_free(capfile_name);
2931 if(capture_opts->save_file != NULL) {
2932 g_free(capture_opts->save_file);
2934 capture_opts->save_file = capfile_name;
2935 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2936 "g_free(capfile_name)". */
2942 /* Do the work of handling either the file size or file duration capture
2943 conditions being reached, and switching files or stopping. */
2945 do_file_switch_or_stop(capture_options *capture_opts,
2946 condition *cnd_autostop_files,
2947 condition *cnd_autostop_size,
2948 condition *cnd_file_duration)
2951 pcap_options *pcap_opts;
2952 interface_options interface_opts;
2953 gboolean successful;
2955 if (capture_opts->multi_files_on) {
2956 if (cnd_autostop_files != NULL &&
2957 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2958 /* no files left: stop here */
2959 global_ld.go = FALSE;
2963 /* Switch to the next ringbuffer file */
2964 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2965 &global_ld.save_file_fd, &global_ld.err)) {
2967 /* File switch succeeded: reset the conditions */
2968 global_ld.bytes_written = 0;
2969 if (capture_opts->use_pcapng) {
2972 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2973 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &(global_ld.bytes_written), &global_ld.err);
2974 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2975 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2976 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2977 successful = libpcap_write_interface_description_block(global_ld.pdh,
2978 interface_opts.name,
2979 interface_opts.cfilter?interface_opts.cfilter:"",
2980 pcap_opts->linktype,
2982 &(global_ld.bytes_written),
2986 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2987 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
2988 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
2989 &global_ld.bytes_written, &global_ld.err);
2992 fclose(global_ld.pdh);
2993 global_ld.pdh = NULL;
2994 global_ld.go = FALSE;
2997 if (cnd_autostop_size)
2998 cnd_reset(cnd_autostop_size);
2999 if (cnd_file_duration)
3000 cnd_reset(cnd_file_duration);
3001 libpcap_dump_flush(global_ld.pdh, NULL);
3003 report_packet_count(global_ld.inpkts_to_sync_pipe);
3004 global_ld.inpkts_to_sync_pipe = 0;
3005 report_new_capture_file(capture_opts->save_file);
3007 /* File switch failed: stop here */
3008 global_ld.go = FALSE;
3012 /* single file, stop now */
3013 global_ld.go = FALSE;
3020 pcap_read_handler(void* arg)
3022 pcap_options *pcap_opts;
3023 char errmsg[MSG_MAX_LENGTH+1];
3025 pcap_opts = (pcap_options *)arg;
3027 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
3028 pcap_opts->interface_id);
3030 while (global_ld.go) {
3031 /* dispatch incoming packets */
3032 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
3034 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
3035 pcap_opts->interface_id);
3036 g_thread_exit(NULL);
3040 /* Do the low-level work of a capture.
3041 Returns TRUE if it succeeds, FALSE otherwise. */
3043 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3046 DWORD upd_time, cur_time; /* GetTickCount() returns a "DWORD" (which is 'unsigned long') */
3048 struct timeval upd_time, cur_time;
3052 condition *cnd_file_duration = NULL;
3053 condition *cnd_autostop_files = NULL;
3054 condition *cnd_autostop_size = NULL;
3055 condition *cnd_autostop_duration = NULL;
3058 gboolean cfilter_error = FALSE;
3059 char errmsg[MSG_MAX_LENGTH+1];
3060 char secondary_errmsg[MSG_MAX_LENGTH+1];
3061 pcap_options *pcap_opts;
3062 interface_options interface_opts;
3063 guint i, error_index = 0;
3065 interface_opts = capture_opts->default_options;
3067 *secondary_errmsg = '\0';
3069 /* init the loop data */
3070 global_ld.go = TRUE;
3071 global_ld.packet_count = 0;
3073 global_ld.report_packet_count = FALSE;
3075 if (capture_opts->has_autostop_packets)
3076 global_ld.packet_max = capture_opts->autostop_packets;
3078 global_ld.packet_max = 0; /* no limit */
3079 global_ld.inpkts_to_sync_pipe = 0;
3080 global_ld.err = 0; /* no error seen yet */
3081 global_ld.pdh = NULL;
3082 global_ld.autostop_files = 0;
3083 global_ld.save_file_fd = -1;
3085 /* We haven't yet gotten the capture statistics. */
3086 *stats_known = FALSE;
3088 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3089 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3091 /* open the "input file" from network interface or capture pipe */
3092 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3093 secondary_errmsg, sizeof(secondary_errmsg))) {
3096 for (i = 0; i < capture_opts->ifaces->len; i++) {
3097 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3098 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3099 /* init the input filter from the network interface (capture pipe will do nothing) */
3101 * When remote capturing WinPCap crashes when the capture filter
3102 * is NULL. This might be a bug in WPCap. Therefore we provide an emtpy
3105 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3106 interface_opts.name,
3107 interface_opts.cfilter?interface_opts.cfilter:"")) {
3109 case INITFILTER_NO_ERROR:
3112 case INITFILTER_BAD_FILTER:
3113 cfilter_error = TRUE;
3115 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3118 case INITFILTER_OTHER_ERROR:
3119 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3120 pcap_geterr(pcap_opts->pcap_h));
3121 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3126 /* If we're supposed to write to a capture file, open it for output
3127 (temporary/specified name/ringbuffer) */
3128 if (capture_opts->saving_to_file) {
3129 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3130 errmsg, sizeof(errmsg))) {
3134 /* set up to write to the already-opened capture output file/files */
3135 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3140 /* XXX - capture SIGTERM and close the capture, in case we're on a
3141 Linux 2.0[.x] system and you have to explicitly close the capture
3142 stream in order to turn promiscuous mode off? We need to do that
3143 in other places as well - and I don't think that works all the
3144 time in any case, due to libpcap bugs. */
3146 /* Well, we should be able to start capturing.
3148 Sync out the capture file, so the header makes it to the file system,
3149 and send a "capture started successfully and capture file created"
3150 message to our parent so that they'll open the capture file and
3151 update its windows to indicate that we have a live capture in
3153 libpcap_dump_flush(global_ld.pdh, NULL);
3154 report_new_capture_file(capture_opts->save_file);
3157 /* initialize capture stop (and alike) conditions */
3158 init_capture_stop_conditions();
3159 /* create stop conditions */
3160 if (capture_opts->has_autostop_filesize)
3162 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3163 if (capture_opts->has_autostop_duration)
3164 cnd_autostop_duration =
3165 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3167 if (capture_opts->multi_files_on) {
3168 if (capture_opts->has_file_duration)
3170 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3172 if (capture_opts->has_autostop_files)
3173 cnd_autostop_files =
3174 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3177 /* init the time values */
3179 upd_time = GetTickCount();
3181 gettimeofday(&upd_time, NULL);
3184 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3186 /* WOW, everything is prepared! */
3187 /* please fasten your seat belts, we will enter now the actual capture loop */
3189 pcap_queue = g_async_queue_new();
3190 pcap_queue_bytes = 0;
3191 pcap_queue_packets = 0;
3192 for (i = 0; i < global_ld.pcaps->len; i++) {
3193 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3194 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3197 while (global_ld.go) {
3198 /* dispatch incoming packets */
3200 GTimeVal write_thread_time;
3201 pcap_queue_element *queue_element;
3203 g_get_current_time(&write_thread_time);
3204 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3205 g_async_queue_lock(pcap_queue);
3206 queue_element = g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3207 if (queue_element) {
3208 pcap_queue_bytes -= queue_element->phdr.caplen;
3209 pcap_queue_packets -= 1;
3211 g_async_queue_unlock(pcap_queue);
3212 if (queue_element) {
3213 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3214 "Dequeued a packet of length %d captured on interface %d.",
3215 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3217 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3218 &queue_element->phdr,
3220 g_free(queue_element->pd);
3221 g_free(queue_element);
3227 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3228 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3229 sizeof(errmsg), pcap_opts);
3232 /* Were we asked to print packet counts by the SIGINFO handler? */
3233 if (global_ld.report_packet_count) {
3234 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3235 plurality(global_ld.packet_count, "", "s"));
3236 global_ld.report_packet_count = FALSE;
3241 /* any news from our parent (signal pipe)? -> just stop the capture */
3242 if (!signal_pipe_check_running()) {
3243 global_ld.go = FALSE;
3248 global_ld.inpkts_to_sync_pipe += inpkts;
3250 /* check capture size condition */
3251 if (cnd_autostop_size != NULL &&
3252 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3253 /* Capture size limit reached, do we have another file? */
3254 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3255 cnd_autostop_size, cnd_file_duration))
3257 } /* cnd_autostop_size */
3258 if (capture_opts->output_to_pipe) {
3259 libpcap_dump_flush(global_ld.pdh, NULL);
3263 /* Only update once every 500ms so as not to overload slow displays.
3264 * This also prevents too much context-switching between the dumpcap
3265 * and wireshark processes.
3267 #define DUMPCAP_UPD_TIME 500
3270 cur_time = GetTickCount(); /* Note: wraps to 0 if sys runs for 49.7 days */
3271 if ((cur_time - upd_time) > DUMPCAP_UPD_TIME) { /* wrap just causes an extra update */
3273 gettimeofday(&cur_time, NULL);
3274 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3275 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3278 upd_time = cur_time;
3281 if (pcap_stats(pch, stats) >= 0) {
3282 *stats_known = TRUE;
3285 /* Let the parent process know. */
3286 if (global_ld.inpkts_to_sync_pipe) {
3288 libpcap_dump_flush(global_ld.pdh, NULL);
3290 /* Send our parent a message saying we've written out
3291 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3293 report_packet_count(global_ld.inpkts_to_sync_pipe);
3295 global_ld.inpkts_to_sync_pipe = 0;
3298 /* check capture duration condition */
3299 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3300 /* The maximum capture time has elapsed; stop the capture. */
3301 global_ld.go = FALSE;
3305 /* check capture file duration condition */
3306 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3307 /* duration limit reached, do we have another file? */
3308 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3309 cnd_autostop_size, cnd_file_duration))
3311 } /* cnd_file_duration */
3315 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3317 pcap_queue_element *queue_element;
3319 for (i = 0; i < global_ld.pcaps->len; i++) {
3320 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3321 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3322 pcap_opts->interface_id);
3323 g_thread_join(pcap_opts->tid);
3324 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3325 pcap_opts->interface_id);
3328 g_async_queue_lock(pcap_queue);
3329 queue_element = g_async_queue_try_pop_unlocked(pcap_queue);
3330 if (queue_element) {
3331 pcap_queue_bytes -= queue_element->phdr.caplen;
3332 pcap_queue_packets -= 1;
3334 g_async_queue_unlock(pcap_queue);
3335 if (queue_element == NULL) {
3338 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3339 "Dequeued a packet of length %d captured on interface %d.",
3340 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3341 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3342 &queue_element->phdr,
3344 g_free(queue_element->pd);
3345 g_free(queue_element);
3346 global_ld.inpkts_to_sync_pipe += 1;
3347 if (capture_opts->output_to_pipe) {
3348 libpcap_dump_flush(global_ld.pdh, NULL);
3354 /* delete stop conditions */
3355 if (cnd_file_duration != NULL)
3356 cnd_delete(cnd_file_duration);
3357 if (cnd_autostop_files != NULL)
3358 cnd_delete(cnd_autostop_files);
3359 if (cnd_autostop_size != NULL)
3360 cnd_delete(cnd_autostop_size);
3361 if (cnd_autostop_duration != NULL)
3362 cnd_delete(cnd_autostop_duration);
3364 /* did we have a pcap (input) error? */
3365 for (i = 0; i < capture_opts->ifaces->len; i++) {
3366 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3367 if (pcap_opts->pcap_err) {
3368 /* On Linux, if an interface goes down while you're capturing on it,
3369 you'll get a "recvfrom: Network is down" or
3370 "The interface went down" error (ENETDOWN).
3371 (At least you will if g_strerror() doesn't show a local translation
3374 On FreeBSD and OS X, if a network adapter disappears while
3375 you're capturing on it, you'll get a "read: Device not configured"
3376 error (ENXIO). (See previous parenthetical note.)
3378 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3380 These should *not* be reported to the Wireshark developers. */
3383 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3384 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3385 strcmp(cap_err_str, "The interface went down") == 0 ||
3386 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3387 strcmp(cap_err_str, "read: I/O error") == 0 ||
3388 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3389 report_capture_error("The network adapter on which the capture was being done "
3390 "is no longer running; the capture has stopped.",
3393 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3395 report_capture_error(errmsg, please_report);
3398 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3399 report_capture_error(errmsg, "");
3403 /* did we have an output error while capturing? */
3404 if (global_ld.err == 0) {
3407 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3408 global_ld.err, FALSE);
3409 report_capture_error(errmsg, please_report);
3413 if (capture_opts->saving_to_file) {
3414 /* close the output file */
3415 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3419 /* there might be packets not yet notified to the parent */
3420 /* (do this after closing the file, so all packets are already flushed) */
3421 if(global_ld.inpkts_to_sync_pipe) {
3423 report_packet_count(global_ld.inpkts_to_sync_pipe);
3424 global_ld.inpkts_to_sync_pipe = 0;
3427 /* If we've displayed a message about a write error, there's no point
3428 in displaying another message about an error on close. */
3429 if (!close_ok && write_ok) {
3430 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3432 report_capture_error(errmsg, "");
3436 * XXX We exhibit different behaviour between normal mode and sync mode
3437 * when the pipe is stdin and not already at EOF. If we're a child, the
3438 * parent's stdin isn't closed, so if the user starts another capture,
3439 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3440 * will say "Unrecognized libpcap format". On the other hand, in normal
3441 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3444 report_capture_count(TRUE);
3446 /* get packet drop statistics from pcap */
3447 for (i = 0; i < capture_opts->ifaces->len; i++) {
3451 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3452 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3453 received = pcap_opts->received;
3454 dropped = pcap_opts->dropped;
3455 if (pcap_opts->pcap_h != NULL) {
3456 g_assert(!pcap_opts->from_cap_pipe);
3457 /* Get the capture statistics, so we know how many packets were dropped. */
3458 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3459 *stats_known = TRUE;
3460 /* Let the parent process know. */
3461 dropped += stats->ps_drop;
3463 g_snprintf(errmsg, sizeof(errmsg),
3464 "Can't get packet-drop statistics: %s",
3465 pcap_geterr(pcap_opts->pcap_h));
3466 report_capture_error(errmsg, please_report);
3469 report_packet_drops(received, dropped, interface_opts.name);
3472 /* close the input file (pcap or capture pipe) */
3473 capture_loop_close_input(&global_ld);
3475 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3477 /* ok, if the write and the close were successful. */
3478 return write_ok && close_ok;
3481 if (capture_opts->multi_files_on) {
3482 /* cleanup ringbuffer */
3483 ringbuf_error_cleanup();
3485 /* We can't use the save file, and we have no FILE * for the stream
3486 to close in order to close it, so close the FD directly. */
3487 if (global_ld.save_file_fd != -1) {
3488 ws_close(global_ld.save_file_fd);
3491 /* We couldn't even start the capture, so get rid of the capture
3493 if (capture_opts->save_file != NULL) {
3494 ws_unlink(capture_opts->save_file);
3495 g_free(capture_opts->save_file);
3498 capture_opts->save_file = NULL;
3500 report_cfilter_error(capture_opts, error_index, errmsg);
3502 report_capture_error(errmsg, secondary_errmsg);
3504 /* close the input file (pcap or cap_pipe) */
3505 capture_loop_close_input(&global_ld);
3507 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3513 static void capture_loop_stop(void)
3515 #ifdef HAVE_PCAP_BREAKLOOP
3517 pcap_options *pcap_opts;
3519 for (i = 0; i < global_ld.pcaps->len; i++) {
3520 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3521 if (pcap_opts->pcap_h != NULL)
3522 pcap_breakloop(pcap_opts->pcap_h);
3525 global_ld.go = FALSE;
3530 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3531 int err, gboolean is_close)
3536 g_snprintf(errmsg, errmsglen,
3537 "Not all the packets could be written to the file"
3538 " to which the capture was being saved\n"
3539 "(\"%s\") because there is no space left on the file system\n"
3540 "on which that file resides.",
3546 g_snprintf(errmsg, errmsglen,
3547 "Not all the packets could be written to the file"
3548 " to which the capture was being saved\n"
3549 "(\"%s\") because you are too close to, or over,"
3550 " your disk quota\n"
3551 "on the file system on which that file resides.",
3558 g_snprintf(errmsg, errmsglen,
3559 "The file to which the capture was being saved\n"
3560 "(\"%s\") could not be closed: %s.",
3561 fname, g_strerror(err));
3563 g_snprintf(errmsg, errmsglen,
3564 "An error occurred while writing to the file"
3565 " to which the capture was being saved\n"
3567 fname, g_strerror(err));
3574 /* one packet was captured, process it */
3576 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3579 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3582 /* We may be called multiple times from pcap_dispatch(); if we've set
3583 the "stop capturing" flag, ignore this packet, as we're not
3584 supposed to be saving any more packets. */
3588 if (global_ld.pdh) {
3589 gboolean successful;
3591 /* We're supposed to write the packet to a file; do so.
3592 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3593 "ld->err" to the error. */
3594 if (global_capture_opts.use_pcapng) {
3595 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, pcap_opts->interface_id, pd, &global_ld.bytes_written, &err);
3597 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3600 global_ld.go = FALSE;
3601 global_ld.err = err;
3603 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3604 "Wrote a packet of length %d captured on interface %u.",
3605 phdr->caplen, pcap_opts->interface_id);
3606 global_ld.packet_count++;
3607 pcap_opts->received++;
3608 /* if the user told us to stop after x packets, do we already have enough? */
3609 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3610 global_ld.go = FALSE;
3616 /* one packet was captured, queue it */
3618 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3621 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3622 pcap_queue_element *queue_element;
3623 gboolean limit_reached;
3625 /* We may be called multiple times from pcap_dispatch(); if we've set
3626 the "stop capturing" flag, ignore this packet, as we're not
3627 supposed to be saving any more packets. */
3631 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3632 if (queue_element == NULL) {
3633 pcap_opts->dropped++;
3636 queue_element->pcap_opts = pcap_opts;
3637 queue_element->phdr = *phdr;
3638 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3639 if (queue_element->pd == NULL) {
3640 pcap_opts->dropped++;
3641 g_free(queue_element);
3644 memcpy(queue_element->pd, pd, phdr->caplen);
3645 g_async_queue_lock(pcap_queue);
3646 if (((pcap_queue_byte_limit > 0) && (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3647 ((pcap_queue_packet_limit > 0) && (pcap_queue_packets < pcap_queue_packet_limit))) {
3648 limit_reached = FALSE;
3649 g_async_queue_push_unlocked(pcap_queue, queue_element);
3650 pcap_queue_bytes += phdr->caplen;
3651 pcap_queue_packets += 1;
3653 limit_reached = TRUE;
3655 g_async_queue_unlock(pcap_queue);
3656 if (limit_reached) {
3657 pcap_opts->dropped++;
3658 g_free(queue_element->pd);
3659 g_free(queue_element);
3660 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3661 "Dropped a packet of length %d captured on interface %u.",
3662 phdr->caplen, pcap_opts->interface_id);
3664 pcap_opts->received++;
3665 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3666 "Queued a packet of length %d captured on interface %u.",
3667 phdr->caplen, pcap_opts->interface_id);
3669 /* I don't want to hold the mutex over the debug output. So the
3670 output may be wrong */
3671 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3672 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3673 pcap_queue_bytes, pcap_queue_packets);
3676 /* And now our feature presentation... [ fade to music ] */
3678 main(int argc, char *argv[])
3681 gboolean arg_error = FALSE;
3686 struct sigaction action, oldaction;
3689 gboolean start_capture = TRUE;
3690 gboolean stats_known;
3691 struct pcap_stat stats;
3692 GLogLevelFlags log_flags;
3693 gboolean list_interfaces = FALSE;
3694 gboolean list_link_layer_types = FALSE;
3695 #ifdef HAVE_BPF_IMAGE
3696 gboolean print_bpf_code = FALSE;
3698 gboolean machine_readable = FALSE;
3699 gboolean print_statistics = FALSE;
3700 int status, run_once_args = 0;
3703 #if defined(__APPLE__) && defined(__LP64__)
3704 struct utsname osinfo;
3708 arg_list_utf_16to8(argc, argv);
3713 * Initialize our DLL search path. MUST be called before LoadLibrary
3716 ws_init_dll_search_path();
3719 #ifdef HAVE_PCAP_REMOTE
3720 #define OPTSTRING_A "A:"
3721 #define OPTSTRING_r "r"
3722 #define OPTSTRING_u "u"
3724 #define OPTSTRING_A ""
3725 #define OPTSTRING_r ""
3726 #define OPTSTRING_u ""
3729 #ifdef HAVE_PCAP_SETSAMPLING
3730 #define OPTSTRING_m "m:"
3732 #define OPTSTRING_m ""
3735 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3736 #define OPTSTRING_B "B:"
3738 #define OPTSTRING_B ""
3739 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3741 #ifdef HAVE_PCAP_CREATE
3742 #define OPTSTRING_I "I"
3744 #define OPTSTRING_I ""
3747 #ifdef HAVE_BPF_IMAGE
3748 #define OPTSTRING_d "d"
3750 #define OPTSTRING_d ""
3754 #define OPTSTRING_t "t"
3756 #define OPTSTRING_t ""
3758 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "L" OPTSTRING_m "MnpPq" OPTSTRING_r "Ss:" OPTSTRING_t OPTSTRING_u "vw:y:Z:"
3760 #ifdef DEBUG_CHILD_DUMPCAP
3761 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3762 fprintf (stderr, "Unable to open debug log file !\n");
3767 #if defined(__APPLE__) && defined(__LP64__)
3769 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3770 * a bug workaround - timeouts less than 1 second don't work with libpcap
3771 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3772 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3773 * The problem is extremely unlikely to be reintroduced in a future
3776 if (uname(&osinfo) == 0) {
3778 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3779 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3780 * number of 10.0.0, not 10.1.0 - go figure).
3782 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3783 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3784 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3785 need_timeout_workaround = TRUE;
3790 * Determine if dumpcap is being requested to run in a special
3791 * capture_child mode by going thru the command line args to see if
3792 * a -Z is present. (-Z is a hidden option).
3794 * The primary result of running in capture_child mode is that
3795 * all messages sent out on stderr are in a special type/len/string
3796 * format to allow message processing by type. These messages include
3797 * error messages if dumpcap fails to start the operation it was
3798 * requested to do, as well as various "status" messages which are sent
3799 * when an actual capture is in progress, and a "success" message sent
3800 * if dumpcap was requested to perform an operation other than a
3803 * Capture_child mode would normally be requested by a parent process
3804 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3805 * to which dumpcap stderr has been redirected. It might also have
3806 * another pipe to obtain dumpcap stdout output; for operations other
3807 * than a capture, that information is formatted specially for easier
3808 * parsing by the parent process.
3810 * Capture_child mode needs to be determined immediately upon
3811 * startup so that any messages generated by dumpcap in this mode
3812 * (eg: during initialization) will be formatted properly.
3815 for (i=1; i<argc; i++) {
3816 if (strcmp("-Z", argv[i]) == 0) {
3817 capture_child = TRUE;
3818 machine_readable = TRUE; /* request machine-readable output */
3820 /* set output pipe to binary mode, to avoid ugly text conversions */
3821 _setmode(2, O_BINARY);
3826 /* The default_log_handler will use stdout, which makes trouble in */
3827 /* capture child mode, as it uses stdout for it's sync_pipe. */
3828 /* So: the filtering is done in the console_log_handler and not here.*/
3829 /* We set the log handlers right up front to make sure that any log */
3830 /* messages when running as child will be sent back to the parent */
3831 /* with the correct format. */
3835 G_LOG_LEVEL_CRITICAL|
3836 G_LOG_LEVEL_WARNING|
3837 G_LOG_LEVEL_MESSAGE|
3840 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3842 g_log_set_handler(NULL,
3844 console_log_handler, NULL /* user_data */);
3845 g_log_set_handler(LOG_DOMAIN_MAIN,
3847 console_log_handler, NULL /* user_data */);
3848 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3850 console_log_handler, NULL /* user_data */);
3851 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3853 console_log_handler, NULL /* user_data */);
3855 /* Initialize the pcaps list */
3856 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
3858 /* Initialize the thread system */
3860 if (!g_thread_supported())
3861 g_thread_init(NULL);
3864 /* Load wpcap if possible. Do this before collecting the run-time version information */
3867 /* ... and also load the packet.dll from wpcap */
3868 /* XXX - currently not required, may change later. */
3869 /*wpcap_packet_load();*/
3871 /* Start windows sockets */
3872 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3874 /* Set handler for Ctrl+C key */
3875 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3877 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3879 action.sa_handler = capture_cleanup_handler;
3881 * Arrange that system calls not get restarted, because when
3882 * our signal handler returns we don't want to restart
3883 * a call that was waiting for packets to arrive.
3885 action.sa_flags = 0;
3886 sigemptyset(&action.sa_mask);
3887 sigaction(SIGTERM, &action, NULL);
3888 sigaction(SIGINT, &action, NULL);
3889 sigaction(SIGPIPE, &action, NULL);
3890 sigaction(SIGHUP, NULL, &oldaction);
3891 if (oldaction.sa_handler == SIG_DFL)
3892 sigaction(SIGHUP, &action, NULL);
3895 /* Catch SIGINFO and, if we get it and we're capturing in
3896 quiet mode, report the number of packets we've captured. */
3897 action.sa_handler = report_counts_siginfo;
3898 action.sa_flags = SA_RESTART;
3899 sigemptyset(&action.sa_mask);
3900 sigaction(SIGINFO, &action, NULL);
3901 #endif /* SIGINFO */
3904 /* ----------------------------------------------------------------- */
3905 /* Privilege and capability handling */
3907 /* 1. Running not as root or suid root; no special capabilities. */
3910 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3913 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3915 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3916 /* capabilities; Drop all other capabilities; */
3917 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3918 /* else: after pcap_open_live() in capture_loop_open_input() */
3919 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3920 /* (Note: this means that the process, although logged in */
3921 /* as root, does not have various permissions such as the */
3922 /* ability to bypass file access permissions). */
3923 /* XXX: Should we just leave capabilities alone in this case */
3924 /* so that user gets expected effect that root can do */
3927 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3929 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3930 /* else: after pcap_open_live() in capture_loop_open_input() */
3931 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3932 /* pcap_open_live). */
3934 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3936 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3937 /* capabilities; Drop all other capabilities; */
3938 /* Drop suid privileges (euid=ruid); */
3939 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3940 /* else: after pcap_open_live() in capture_loop_open_input() */
3941 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3943 /* XXX: For some Linux versions/distros with capabilities */
3944 /* a 'normal' process with any capabilities cannot be */
3945 /* 'killed' (signaled) from another (same uid) non-privileged */
3947 /* For example: If (non-suid) Wireshark forks a */
3948 /* child suid dumpcap which acts as described here (case 5), */
3949 /* Wireshark will be unable to kill (signal) the child */
3950 /* dumpcap process until the capabilities have been dropped */
3951 /* (after pcap_open_live()). */
3952 /* This behaviour will apparently be changed in the kernel */
3953 /* to allow the kill (signal) in this case. */
3954 /* See the following for details: */
3955 /* http://www.mail-archive.com/ [wrapped] */
3956 /* linux-security-module@vger.kernel.org/msg02913.html */
3958 /* It is therefore conceivable that if dumpcap somehow hangs */
3959 /* in pcap_open_live or before that wireshark will not */
3960 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3961 /* In this case, exiting wireshark will kill the child */
3962 /* dumpcap process. */
3964 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3965 /* capabilities; Using libcap. Note: capset cmd (which see) */
3966 /* used to assign capabilities to file. */
3968 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3969 /* else: after pcap_open_live() in capture_loop_open_input() */
3970 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3972 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3973 /* longer required (similar to capture). */
3975 /* ----------------------------------------------------------------- */
3977 init_process_policies();
3980 /* If 'started with special privileges' (and using libcap) */
3981 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3982 /* Set euid/egid = ruid/rgid to remove suid privileges */
3983 relinquish_privs_except_capture();
3986 /* Set the initial values in the capture options. This might be overwritten
3987 by the command line parameters. */
3988 capture_opts_init(&global_capture_opts, NULL);
3990 /* We always save to a file - if no file was specified, we save to a
3992 global_capture_opts.saving_to_file = TRUE;
3993 global_capture_opts.has_ring_num_files = TRUE;
3995 /* Now get our args */
3996 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3998 case 'h': /* Print help and exit */
4002 case 'v': /* Show version and exit */
4004 GString *comp_info_str;
4005 GString *runtime_info_str;
4006 /* Assemble the compile-time version information string */
4007 comp_info_str = g_string_new("Compiled ");
4008 get_compiled_version_info(comp_info_str, NULL, NULL);
4010 /* Assemble the run-time version information string */
4011 runtime_info_str = g_string_new("Running ");
4012 get_runtime_version_info(runtime_info_str, NULL);
4013 show_version(comp_info_str, runtime_info_str);
4014 g_string_free(comp_info_str, TRUE);
4015 g_string_free(runtime_info_str, TRUE);
4019 /*** capture option specific ***/
4020 case 'a': /* autostop criteria */
4021 case 'b': /* Ringbuffer option */
4022 case 'c': /* Capture x packets */
4023 case 'f': /* capture filter */
4024 case 'i': /* Use interface x */
4025 case 'n': /* Use pcapng format */
4026 case 'p': /* Don't capture in promiscuous mode */
4027 case 'P': /* Use pcap format */
4028 case 's': /* Set the snapshot (capture) length */
4029 case 'w': /* Write to capture file x */
4030 case 'g': /* enable group read accesson file(s) */
4031 case 'y': /* Set the pcap data link type */
4032 #ifdef HAVE_PCAP_REMOTE
4033 case 'u': /* Use UDP for data transfer */
4034 case 'r': /* Capture own RPCAP traffic too */
4035 case 'A': /* Authentication */
4037 #ifdef HAVE_PCAP_SETSAMPLING
4038 case 'm': /* Sampling */
4040 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4041 case 'B': /* Buffer size */
4042 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4043 #ifdef HAVE_PCAP_CREATE
4044 case 'I': /* Monitor mode */
4046 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4051 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4053 capture_child = TRUE;
4055 /* set output pipe to binary mode, to avoid ugly text conversions */
4056 _setmode(2, O_BINARY);
4058 * optarg = the control ID, aka the PPID, currently used for the
4061 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4062 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4063 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4064 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4066 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4067 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4068 "Signal pipe: Unable to open %s. Dead parent?",
4076 case 'q': /* Quiet */
4084 /*** all non capture option specific ***/
4085 case 'D': /* Print a list of capture devices and exit */
4086 list_interfaces = TRUE;
4089 case 'L': /* Print list of link-layer types and exit */
4090 list_link_layer_types = TRUE;
4093 #ifdef HAVE_BPF_IMAGE
4094 case 'd': /* Print BPF code for capture filter and exit */
4095 print_bpf_code = TRUE;
4099 case 'S': /* Print interface statistics once a second */
4100 print_statistics = TRUE;
4103 case 'M': /* For -D, -L, and -S, print machine-readable output */
4104 machine_readable = TRUE;
4107 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4109 case '?': /* Bad flag - print usage message */
4118 /* user specified file name as regular command-line argument */
4119 /* XXX - use it as the capture file name (or something else)? */
4125 * Extra command line arguments were specified; complain.
4126 * XXX - interpret as capture filter, as tcpdump and tshark do?
4128 cmdarg_err("Invalid argument: %s", argv[0]);
4138 if (run_once_args > 1) {
4139 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4141 } else if (run_once_args == 1) {
4142 /* We're supposed to print some information, rather than
4143 to capture traffic; did they specify a ring buffer option? */
4144 if (global_capture_opts.multi_files_on) {
4145 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4149 /* We're supposed to capture traffic; */
4150 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4152 if (global_capture_opts.ifaces->len > 1) {
4154 global_capture_opts.use_pcapng = TRUE;
4157 /* Was the ring buffer option specified and, if so, does it make sense? */
4158 if (global_capture_opts.multi_files_on) {
4159 /* Ring buffer works only under certain conditions:
4160 a) ring buffer does not work with temporary files;
4161 b) it makes no sense to enable the ring buffer if the maximum
4162 file size is set to "infinite". */
4163 if (global_capture_opts.save_file == NULL) {
4164 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4165 global_capture_opts.multi_files_on = FALSE;
4167 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4168 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4170 /* XXX - this must be redesigned as the conditions changed */
4171 global_capture_opts.multi_files_on = FALSE;
4178 * "-D" requires no interface to be selected; it's supposed to list
4181 if (list_interfaces) {
4182 /* Get the list of interfaces */
4187 if_list = capture_interface_list(&err, &err_str);
4188 if (if_list == NULL) {
4190 case CANT_GET_INTERFACE_LIST:
4191 cmdarg_err("%s", err_str);
4196 case NO_INTERFACES_FOUND:
4198 * If we're being run by another program, just give them
4199 * an empty list of interfaces, don't report this as
4200 * an error; that lets them decide whether to report
4201 * this as an error or not.
4203 if (!machine_readable) {
4204 cmdarg_err("There are no interfaces on which a capture can be done");
4211 if (machine_readable) /* tab-separated values to stdout */
4212 print_machine_readable_interfaces(if_list);
4214 capture_opts_print_interfaces(if_list);
4215 free_interface_list(if_list);
4220 * "-S" requires no interface to be selected; it gives statistics
4221 * for all interfaces.
4223 if (print_statistics) {
4224 status = print_statistics_loop(machine_readable);
4229 * "-L", "-d", and capturing act on a particular interface, so we have to
4230 * have an interface; if none was specified, pick a default.
4232 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4233 /* cmdarg_err() already called .... */
4237 /* Let the user know what interfaces were chosen. */
4238 /* get_interface_descriptive_name() is not available! */
4239 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4240 interface_options interface_opts;
4242 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4243 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s", interface_opts.name);
4246 if (list_link_layer_types) {
4247 /* Get the list of link-layer types for the capture device. */
4248 if_capabilities_t *caps;
4252 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4253 interface_options interface_opts;
4255 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4256 caps = get_if_capabilities(interface_opts.name,
4257 interface_opts.monitor_mode, &err_str);
4259 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4260 "Please check to make sure you have sufficient permissions, and that\n"
4261 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4265 if (caps->data_link_types == NULL) {
4266 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4269 if (machine_readable) /* tab-separated values to stdout */
4270 /* XXX: We need to change the format and adopt consumers */
4271 print_machine_readable_if_capabilities(caps);
4273 /* XXX: We might want to print also the interface name */
4274 capture_opts_print_if_capabilities(caps, interface_opts.name,
4275 interface_opts.monitor_mode);
4276 free_if_capabilities(caps);
4281 /* We're supposed to do a capture, or print the BPF code for a filter.
4282 Process the snapshot length, as that affects the generated BPF code. */
4283 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4285 #ifdef HAVE_BPF_IMAGE
4286 if (print_bpf_code) {
4287 show_filter_code(&global_capture_opts);
4292 /* We're supposed to do a capture. Process the ring buffer arguments. */
4293 capture_opts_trim_ring_num_files(&global_capture_opts);
4295 /* Now start the capture. */
4297 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4301 /* capture failed */
4304 return 0; /* never here, make compiler happy */
4309 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4310 const char *message, gpointer user_data _U_)
4317 /* ignore log message, if log_level isn't interesting */
4318 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4319 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4324 /* create a "timestamp" */
4326 today = localtime(&curr);
4328 switch(log_level & G_LOG_LEVEL_MASK) {
4329 case G_LOG_LEVEL_ERROR:
4332 case G_LOG_LEVEL_CRITICAL:
4335 case G_LOG_LEVEL_WARNING:
4338 case G_LOG_LEVEL_MESSAGE:
4341 case G_LOG_LEVEL_INFO:
4344 case G_LOG_LEVEL_DEBUG:
4348 fprintf(stderr, "unknown log_level %u\n", log_level);
4350 g_assert_not_reached();
4353 /* Generate the output message */
4354 if(log_level & G_LOG_LEVEL_MESSAGE) {
4355 /* normal user messages without additional infos */
4356 msg = g_strdup_printf("%s\n", message);
4358 /* info/debug messages with additional infos */
4359 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4360 today->tm_hour, today->tm_min, today->tm_sec,
4361 log_domain != NULL ? log_domain : "",
4365 /* DEBUG & INFO msgs (if we're debugging today) */
4366 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4367 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4368 #ifdef DEBUG_DUMPCAP
4369 fprintf(stderr, "%s", msg);
4372 #ifdef DEBUG_CHILD_DUMPCAP
4373 fprintf(debug_log, "%s", msg);
4381 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4382 /* to parent especially formatted if dumpcap running as child. */
4383 if (capture_child) {
4384 sync_pipe_errmsg_to_parent(2, msg, "");
4386 fprintf(stderr, "%s", msg);
4393 /****************************************************************************************************************/
4394 /* indication report routines */
4398 report_packet_count(int packet_count)
4400 char tmp[SP_DECISIZE+1+1];
4401 static int count = 0;
4404 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4405 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4406 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4408 count += packet_count;
4409 fprintf(stderr, "\rPackets: %u ", count);
4410 /* stderr could be line buffered */
4416 report_new_capture_file(const char *filename)
4419 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4420 pipe_write_block(2, SP_FILE, filename);
4424 * Prevent a SIGINFO handler from writing to the standard error
4425 * while we're doing so; instead, have it just set a flag telling
4426 * us to print that information when we're done.
4429 #endif /* SIGINFO */
4430 fprintf(stderr, "File: %s\n", filename);
4431 /* stderr could be line buffered */
4436 * Allow SIGINFO handlers to write.
4441 * If a SIGINFO handler asked us to write out capture counts, do so.
4444 report_counts_for_siginfo();
4445 #endif /* SIGINFO */
4450 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4452 interface_options interface_opts;
4453 char tmp[MSG_MAX_LENGTH+1+6];
4455 if (i < capture_opts->ifaces->len) {
4456 if (capture_child) {
4457 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4458 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4459 pipe_write_block(2, SP_BAD_FILTER, tmp);
4462 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4463 * the error message below.
4465 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4467 "Invalid capture filter \"%s\" for interface %s!\n"
4469 "That string isn't a valid capture filter (%s).\n"
4470 "See the User's Guide for a description of the capture filter syntax.\n",
4471 interface_opts.cfilter, interface_opts.name, errmsg);
4477 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4480 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4481 "Primary Error: %s", error_msg);
4482 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4483 "Secondary Error: %s", secondary_error_msg);
4484 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4486 fprintf(stderr, "%s\n", error_msg);
4487 if (secondary_error_msg[0] != '\0')
4488 fprintf(stderr, "%s\n", secondary_error_msg);
4493 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4495 char tmp[SP_DECISIZE+1+1];
4497 g_snprintf(tmp, sizeof(tmp), "%u", drops);
4500 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4501 "Packets received/dropped on interface %s: %u/%u",
4502 name, received, drops);
4503 /* XXX: Need to provide interface id, changes to consumers required. */
4504 pipe_write_block(2, SP_DROPS, tmp);
4507 "Packets received/dropped on interface %s: %u/%u (%.1f%%)\n",
4508 name, received, drops,
4509 received ? 100.0 * received / (received + drops) : 0.0);
4510 /* stderr could be line buffered */
4516 /****************************************************************************************************************/
4517 /* signal_pipe handling */
4522 signal_pipe_check_running(void)
4524 /* any news from our parent? -> just stop the capture */
4528 /* if we are running standalone, no check required */
4529 if(!capture_child) {
4533 if(!sig_pipe_name || !sig_pipe_handle) {
4534 /* This shouldn't happen */
4535 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4536 "Signal pipe: No name or handle");
4541 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4542 * at this point. Should we check to see if the parent is still alive,
4543 * e.g. by using OpenProcess?
4546 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4548 if(!result || avail > 0) {
4549 /* peek failed or some bytes really available */
4550 /* (if not piping from stdin this would fail) */
4551 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4552 "Signal pipe: Stop capture: %s", sig_pipe_name);
4553 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4554 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4555 sig_pipe_handle, result, avail);
4558 /* pipe ok and no bytes available */
4565 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4570 * indent-tabs-mode: nil
4573 * vi: set shiftwidth=4 tabstop=8 expandtab:
4574 * :indentSize=4:tabSize=8:noTabs=true: