3 * Wireshark - Network traffic analyzer
4 * By Gerald Combs <gerald@wireshark.org>
5 * Copyright 1998 Gerald Combs
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <stdlib.h> /* for exit() */
30 #ifdef HAVE_SYS_TYPES_H
31 # include <sys/types.h>
34 #ifdef HAVE_SYS_SOCKET_H
35 #include <sys/socket.h>
38 #ifdef HAVE_NETINET_IN_H
39 #include <netinet/in.h>
46 #ifdef HAVE_ARPA_INET_H
47 #include <arpa/inet.h>
50 #if defined(__APPLE__) && defined(__LP64__)
51 #include <sys/utsname.h>
57 #include <wsutil/cmdarg_err.h>
58 #include <wsutil/crash_info.h>
59 #include <ws_version_info.h>
61 #ifndef HAVE_GETOPT_LONG
62 #include "wsutil/wsgetopt.h"
70 # include <sys/prctl.h>
71 # include <sys/capability.h>
74 #include "ringbuffer.h"
76 #include "caputils/capture_ifinfo.h"
77 #include "caputils/capture-pcap-util.h"
78 #include "caputils/capture-pcap-util-int.h"
80 #include "caputils/capture-wpcap.h"
83 #include "writecap/pcapio.h"
86 #include <wsutil/unicode-utils.h>
93 #include <wsutil/clopts_common.h>
94 #include <wsutil/privileges.h>
96 #include "sync_pipe.h"
98 #include "capture_opts.h"
99 #include <capchild/capture_session.h>
100 #include <capchild/capture_sync.h>
102 #include "conditions.h"
103 #include "capture_stop_conditions.h"
105 #include "wsutil/tempfile.h"
107 #include "wsutil/file_util.h"
108 #include "wsutil/os_version_info.h"
109 #include "wsutil/str_util.h"
110 #include "wsutil/inet_addr.h"
112 #include "caputils/ws80211_utils.h"
119 * Get information about libpcap format from "wiretap/libpcap.h".
120 * XXX - can we just use pcap_open_offline() to read the pipe?
122 #include "wiretap/libpcap.h"
124 /**#define DEBUG_DUMPCAP**/
125 /**#define DEBUG_CHILD_DUMPCAP**/
129 #include <conio.h> /* _getch() */
133 #ifdef DEBUG_CHILD_DUMPCAP
134 FILE *debug_log; /* for logging debug messages to */
135 /* a file if DEBUG_CHILD_DUMPCAP */
139 static GAsyncQueue *pcap_queue;
140 static gint64 pcap_queue_bytes;
141 static gint64 pcap_queue_packets;
142 static gint64 pcap_queue_byte_limit = 0;
143 static gint64 pcap_queue_packet_limit = 0;
145 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
147 static gchar *sig_pipe_name = NULL;
148 static HANDLE sig_pipe_handle = NULL;
149 static gboolean signal_pipe_check_running(void);
153 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
154 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
157 /** Stop a low-level capture (stops the capture child). */
158 static void capture_loop_stop(void);
159 /** Close a pipe, or socket if \a from_socket is TRUE */
160 static void cap_pipe_close(int pipe_fd, gboolean from_socket _U_);
164 * Enable kernel BPF JIT compiler if available.
165 * If any calls fail, just drive on - the JIT compiler might not be
166 * enabled, but filtering will still work, and it's not clear what
167 * we could do if the calls fail; should we just report the error
168 * and not continue to capture, should we report it as a warning, or
172 enable_kernel_bpf_jit_compiler(void)
176 static const char file[] = "/proc/sys/net/core/bpf_jit_enable";
178 fd = ws_open(file, O_WRONLY);
182 written = ws_write(fd, "1", strlen("1"));
188 #if !defined (__linux__)
189 #ifndef HAVE_PCAP_BREAKLOOP
191 * We don't have pcap_breakloop(), which is the only way to ensure that
192 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
193 * won't, if the call to read the next packet or batch of packets is
194 * is interrupted by a signal on UN*X, just go back and try again to
197 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
198 * the signal handler, set a flag to stop capturing; however, without
199 * a guarantee of that sort, we can't guarantee that we'll stop capturing
200 * if the read will be retried and won't time out if no packets arrive.
202 * Therefore, on at least some platforms, we work around the lack of
203 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
204 * to wait for packets to arrive, so that we're probably going to be
205 * blocked in the select() when the signal arrives, and can just bail
206 * out of the loop at that point.
208 * However, we don't want to do that on BSD (because "select()" doesn't work
209 * correctly on BPF devices on at least some releases of some flavors of
210 * BSD), and we don't want to do it on Windows (because "select()" is
211 * something for sockets, not for arbitrary handles). (Note that "Windows"
212 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
213 * using WinPcap, not a UNIX libpcap.)
215 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
216 * on BSD times out even if no packets have arrived, so we'll eventually
217 * exit pcap_dispatch() with an indication that no packets have arrived,
218 * and will break out of the capture loop at that point.
220 * On Windows, we can't send a SIGINT to stop capturing, so none of this
221 * applies in any case.
223 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
224 * want to include it if it's not present on this platform, however.
226 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
227 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
229 # define MUST_DO_SELECT
230 # endif /* avoid select */
231 #endif /* HAVE_PCAP_BREAKLOOP */
233 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
234 * in pcap_dispatch(); on the other hand, select() works just fine there.
235 * Hence we use a select for that come what may.
237 * XXX - with TPACKET_V1 and TPACKET_V2, it currently uses select()
238 * internally, and, with TPACKET_V3, once that's supported, it'll
239 * support timeouts, at least as I understand the way the code works.
241 #define MUST_DO_SELECT
244 /** init the capture filter */
247 INITFILTER_BAD_FILTER,
248 INITFILTER_OTHER_ERROR
249 } initfilter_status_t;
252 STATE_EXPECT_REC_HDR,
265 typedef struct _pcap_options {
270 #ifdef MUST_DO_SELECT
271 int pcap_fd; /**< pcap file descriptor */
278 gboolean ts_nsec; /**< TRUE if we're using nanosecond precision. */
279 /**< capture pipe (unix only "input file") */
280 gboolean from_cap_pipe; /**< TRUE if we are capturing data from a capture pipe */
281 gboolean from_cap_socket; /**< TRUE if we're capturing from socket */
282 struct pcap_hdr cap_pipe_hdr; /**< Pcap header when capturing from a pipe */
283 struct pcaprec_modified_hdr cap_pipe_rechdr; /**< Pcap record header when capturing from a pipe */
285 HANDLE cap_pipe_h; /**< The handle of the capture pipe */
287 int cap_pipe_fd; /**< the file descriptor of the capture pipe */
288 gboolean cap_pipe_modified; /**< TRUE if data in the pipe uses modified pcap headers */
289 gboolean cap_pipe_byte_swapped; /**< TRUE if data in the pipe is byte swapped */
291 char * cap_pipe_buf; /**< Pointer to the data buffer we read into */
292 DWORD cap_pipe_bytes_to_read; /**< Used by cap_pipe_dispatch */
293 DWORD cap_pipe_bytes_read; /**< Used by cap_pipe_dispatch */
295 size_t cap_pipe_bytes_to_read; /**< Used by cap_pipe_dispatch */
296 size_t cap_pipe_bytes_read; /**< Used by cap_pipe_dispatch */
298 cap_pipe_state_t cap_pipe_state;
299 cap_pipe_err_t cap_pipe_err;
302 GMutex *cap_pipe_read_mtx;
303 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
307 typedef struct _loop_data {
309 gboolean go; /**< TRUE as long as we're supposed to keep capturing */
310 int err; /**< if non-zero, error seen while capturing */
311 gint packet_count; /**< Number of packets we have already captured */
312 gint packet_max; /**< Number of packets we're supposed to capture - 0 means infinite */
313 guint inpkts_to_sync_pipe; /**< Packets not already send out to the sync_pipe */
315 gboolean report_packet_count; /**< Set by SIGINFO handler; print packet count */
321 guint64 bytes_written;
322 guint32 autostop_files;
325 typedef struct _pcap_queue_element {
326 pcap_options *pcap_opts;
327 struct pcap_pkthdr phdr;
329 } pcap_queue_element;
332 * Standard secondary message for unexpected errors.
334 static const char please_report[] =
335 "Please report this to the Wireshark developers.\n"
336 "https://bugs.wireshark.org/\n"
337 "(This is not a crash; please do not report it as such.)";
340 * This needs to be static, so that the SIGINT handler can clear the "go"
343 static loop_data global_ld;
346 * Timeout, in milliseconds, for reads from the stream of captured packets
347 * from a capture device.
349 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
350 * 64-bit applications, with sub-second timeouts not to work. The bug is
351 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
353 #if defined(__APPLE__) && defined(__LP64__)
354 static gboolean need_timeout_workaround;
356 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
358 #define CAP_READ_TIMEOUT 250
362 * Timeout, in microseconds, for reads from the stream of captured packets
363 * from a pipe. Pipes don't have the same problem that BPF devices do
364 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
365 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
366 * of the offending versions of Snow Leopard.
368 * On Windows this value is converted to milliseconds and passed to
369 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
370 * will return immediately.
373 #define PIPE_READ_TIMEOUT 100000
375 #define PIPE_READ_TIMEOUT 250000
378 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
381 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
382 const char *message, gpointer user_data _U_);
384 /* capture related options */
385 static capture_options global_capture_opts;
386 static gboolean quiet = FALSE;
387 static gboolean use_threads = FALSE;
388 static guint64 start_time;
390 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
392 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
394 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
395 int err, gboolean is_close);
397 static void WS_NORETURN exit_main(int err);
399 static void report_new_capture_file(const char *filename);
400 static void report_packet_count(unsigned int packet_count);
401 static void report_packet_drops(guint32 received, guint32 pcap_drops, guint32 drops, guint32 flushed, guint32 ps_ifdrop, gchar *name);
402 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
403 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
405 #define MSG_MAX_LENGTH 4096
407 /* Copied from pcapio.c pcapng_write_interface_statistics_block()*/
409 create_timestamp(void) {
419 * Current time, represented as 100-nanosecond intervals since
420 * January 1, 1601, 00:00:00 UTC.
422 * I think DWORD might be signed, so cast both parts of "now"
423 * to guint32 so that the sign bit doesn't get treated specially.
425 * Windows 8 provides GetSystemTimePreciseAsFileTime which we
426 * might want to use instead.
428 GetSystemTimeAsFileTime(&now);
429 timestamp = (((guint64)(guint32)now.dwHighDateTime) << 32) +
430 (guint32)now.dwLowDateTime;
433 * Convert to same thing but as 1-microsecond, i.e. 1000-nanosecond,
439 * Subtract difference, in microseconds, between January 1, 1601
440 * 00:00:00 UTC and January 1, 1970, 00:00:00 UTC.
442 timestamp -= G_GUINT64_CONSTANT(11644473600000000);
445 * Current time, represented as seconds and microseconds since
446 * January 1, 1970, 00:00:00 UTC.
448 gettimeofday(&now, NULL);
451 * Convert to delta in microseconds.
453 timestamp = (guint64)(now.tv_sec) * 1000000 +
454 (guint64)(now.tv_usec);
460 print_usage(FILE *output)
462 fprintf(output, "\nUsage: dumpcap [options] ...\n");
463 fprintf(output, "\n");
464 fprintf(output, "Capture interface:\n");
465 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback),\n"
466 " or for remote capturing, use one of these formats:\n"
467 " rpcap://<host>/<interface>\n"
468 " TCP@<host>:<port>\n");
469 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
470 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
471 fprintf(output, " -p don't capture in promiscuous mode\n");
472 #ifdef HAVE_PCAP_CREATE
473 fprintf(output, " -I capture in monitor mode, if available\n");
475 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
476 fprintf(output, " -B <buffer size> size of kernel buffer in MiB (def: %dMiB)\n", DEFAULT_CAPTURE_BUFFER_SIZE);
478 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
479 fprintf(output, " -D print list of interfaces and exit\n");
480 fprintf(output, " -L print list of link-layer types of iface and exit\n");
481 #ifdef HAVE_BPF_IMAGE
482 fprintf(output, " -d print generated BPF code for capture filter\n");
484 fprintf(output, " -k set channel on wifi interface:\n"
485 " <freq>,[<type>],[<center_freq1>],[<center_freq2>]\n");
486 fprintf(output, " -S print statistics for each interface once per second\n");
487 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
488 fprintf(output, "\n");
489 #ifdef HAVE_PCAP_REMOTE
490 fprintf(output, "RPCAP options:\n");
491 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
492 fprintf(output, " -u use UDP for RPCAP data transfer\n");
493 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
494 #ifdef HAVE_PCAP_SETSAMPLING
495 fprintf(output, " -m <sampling type> use packet sampling\n");
496 fprintf(output, " count:NUM - capture one packet of every NUM\n");
497 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
500 fprintf(output, "Stop conditions:\n");
501 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
502 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
503 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
504 fprintf(output, " files:NUM - stop after NUM files\n");
505 /*fprintf(output, "\n");*/
506 fprintf(output, "Output (files):\n");
507 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
508 fprintf(output, " -g enable group read access on the output file(s)\n");
509 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
510 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
511 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
512 fprintf(output, " -n use pcapng format instead of pcap (default)\n");
513 fprintf(output, " -P use libpcap format instead of pcapng\n");
514 fprintf(output, " --capture-comment <comment>\n");
515 fprintf(output, " add a capture comment to the output file\n");
516 fprintf(output, " (only for pcapng)\n");
517 fprintf(output, "\n");
518 fprintf(output, "Miscellaneous:\n");
519 fprintf(output, " -N <packet_limit> maximum number of packets buffered within dumpcap\n");
520 fprintf(output, " -C <byte_limit> maximum number of bytes used for buffering packets\n");
521 fprintf(output, " within dumpcap\n");
522 fprintf(output, " -t use a separate thread per interface\n");
523 fprintf(output, " -q don't report packet capture counts\n");
524 fprintf(output, " -v print version information and exit\n");
525 fprintf(output, " -h display this help and exit\n");
526 fprintf(output, "\n");
528 fprintf(output, "WARNING: dumpcap will enable kernel BPF JIT compiler if available.\n");
529 fprintf(output, "You might want to reset it\n");
530 fprintf(output, "By doing \"echo 0 > /proc/sys/net/core/bpf_jit_enable\"\n");
531 fprintf(output, "\n");
533 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcapng\n");
534 fprintf(output, "\"Capture packets from interface eth0 until 60s passed into output.pcapng\"\n");
535 fprintf(output, "\n");
536 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
540 * Report an error in command-line arguments.
541 * If we're a capture child, send a message back to the parent, otherwise
545 dumpcap_cmdarg_err(const char *fmt, va_list ap)
549 /* Generate a 'special format' message back to parent */
550 msg = g_strdup_vprintf(fmt, ap);
551 sync_pipe_errmsg_to_parent(2, msg, "");
554 fprintf(stderr, "dumpcap: ");
555 vfprintf(stderr, fmt, ap);
556 fprintf(stderr, "\n");
561 * Report additional information for an error in command-line arguments.
562 * If we're a capture child, send a message back to the parent, otherwise
566 dumpcap_cmdarg_err_cont(const char *fmt, va_list ap)
570 msg = g_strdup_vprintf(fmt, ap);
571 sync_pipe_errmsg_to_parent(2, msg, "");
574 vfprintf(stderr, fmt, ap);
575 fprintf(stderr, "\n");
581 #if 0 /* Set to enable capability debugging */
582 /* see 'man cap_to_text()' for explanation of output */
583 /* '=' means 'all= ' ie: no capabilities */
584 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
586 print_caps(const char *pfx) {
587 cap_t caps = cap_get_proc();
588 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
589 "%s: EUID: %d Capabilities: %s", pfx,
590 geteuid(), cap_to_text(caps, NULL));
593 print_caps(const char *pfx _U_) {
598 relinquish_all_capabilities(void)
600 /* Drop any and all capabilities this process may have. */
601 /* Allowed whether or not process has any privileges. */
602 cap_t caps = cap_init(); /* all capabilities initialized to off */
603 print_caps("Pre-clear");
604 if (cap_set_proc(caps)) {
605 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
607 print_caps("Post-clear");
613 get_capture_device_open_failure_messages(const char *open_err_str,
615 char *errmsg, size_t errmsg_len,
616 char *secondary_errmsg,
617 size_t secondary_errmsg_len)
620 const char *libpcap_warn;
621 static const char ppamsg[] = "can't find PPA for ";
624 g_snprintf(errmsg, (gulong) errmsg_len,
625 "The capture session could not be initiated on interface '%s' (%s).",
626 iface, open_err_str);
629 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
631 "In order to capture packets, WinPcap must be installed; see\n"
633 " https://www.winpcap.org/\n"
635 "for a downloadable version of WinPcap and for instructions on how to install\n"
638 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
640 "Please check that \"%s\" is the proper interface.\n"
643 "Help can be found at:\n"
645 " https://wiki.wireshark.org/WinPcap\n"
646 " https://wiki.wireshark.org/CaptureSetup\n",
650 /* If we got a "can't find PPA for X" message, warn the user (who
651 is running dumpcap on HP-UX) that they don't have a version of
652 libpcap that properly handles HP-UX (libpcap 0.6.x and later
653 versions, which properly handle HP-UX, say "can't find /dev/dlpi
654 PPA for X" rather than "can't find PPA for X"). */
655 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
658 "You are running (T)Wireshark with a version of the libpcap library\n"
659 "that doesn't handle HP-UX network devices well; this means that\n"
660 "(T)Wireshark may not be able to capture packets.\n"
662 "To fix this, you should install libpcap 0.6.2, or a later version\n"
663 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
664 "packaged binary form from the Software Porting And Archive Centre\n"
665 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
666 "at the URL lists a number of mirror sites.";
670 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
671 "Please check to make sure you have sufficient permissions, and that you have "
672 "the proper interface or pipe specified.%s", libpcap_warn);
677 compile_capture_filter(const char *iface, pcap_t *pcap_h,
678 struct bpf_program *fcode, const char *cfilter)
680 bpf_u_int32 netnum, netmask;
681 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
683 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
685 * Well, we can't get the netmask for this interface; it's used
686 * only for filters that check for broadcast IP addresses, so
687 * we just punt and use 0. It might be nice to warn the user,
688 * but that's a pain in a GUI application, as it'd involve popping
689 * up a message box, and it's not clear how often this would make
690 * a difference (only filters that check for IP broadcast addresses
694 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
699 * Sigh. Older versions of libpcap don't properly declare the
700 * third argument to pcap_compile() as a const pointer. Cast
704 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
710 #ifdef HAVE_BPF_IMAGE
712 show_filter_code(capture_options *capture_opts)
714 interface_options interface_opts;
716 gchar open_err_str[PCAP_ERRBUF_SIZE];
717 char errmsg[MSG_MAX_LENGTH+1];
718 char secondary_errmsg[MSG_MAX_LENGTH+1];
719 struct bpf_program fcode;
720 struct bpf_insn *insn;
724 for (j = 0; j < capture_opts->ifaces->len; j++) {
725 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
726 pcap_h = open_capture_device(capture_opts, &interface_opts,
727 CAP_READ_TIMEOUT, &open_err_str);
728 if (pcap_h == NULL) {
729 /* Open failed; get messages */
730 get_capture_device_open_failure_messages(open_err_str,
732 errmsg, sizeof errmsg,
734 sizeof secondary_errmsg);
735 /* And report them */
736 report_capture_error(errmsg, secondary_errmsg);
740 /* Set the link-layer type. */
741 if (!set_pcap_datalink(pcap_h, interface_opts.linktype, interface_opts.name,
742 errmsg, sizeof errmsg,
743 secondary_errmsg, sizeof secondary_errmsg)) {
745 report_capture_error(errmsg, secondary_errmsg);
749 /* OK, try to compile the capture filter. */
750 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
751 interface_opts.cfilter)) {
753 report_cfilter_error(capture_opts, j, errmsg);
758 /* Now print the filter code. */
759 insn = fcode.bf_insns;
761 for (i = 0; i < fcode.bf_len; insn++, i++)
762 printf("%s\n", bpf_image(insn, i));
764 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
765 /* to remove any suid privileges. */
766 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
767 /* (euid/egid have already previously been set to ruid/rgid. */
768 /* (See comment in main() for details) */
770 relinquish_special_privs_perm();
772 relinquish_all_capabilities();
775 /* Let our parent know we succeeded. */
776 pipe_write_block(2, SP_SUCCESS, NULL);
783 * capture_interface_list() is expected to do the right thing to get
784 * a list of interfaces.
786 * In most of the programs in the Wireshark suite, "the right thing"
787 * is to run dumpcap and ask it for the list, because dumpcap may
788 * be the only program in the suite with enough privileges to get
791 * In dumpcap itself, however, we obviously can't run dumpcap to
792 * ask for the list. Therefore, our capture_interface_list() should
793 * just call get_interface_list().
796 capture_interface_list(int *err, char **err_str, void(*update_cb)(void) _U_)
798 return get_interface_list(err, err_str);
801 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
803 * Output a machine readable list of the interfaces
804 * This list is retrieved by the sync_interface_list_open() function
805 * The actual output of this function can be viewed with the command "dumpcap -D -Z none"
808 print_machine_readable_interfaces(GList *if_list)
815 char addr_str[ADDRSTRLEN];
818 /* Let our parent know we succeeded. */
819 pipe_write_block(2, SP_SUCCESS, NULL);
822 i = 1; /* Interface id number */
823 for (if_entry = g_list_first(if_list); if_entry != NULL;
824 if_entry = g_list_next(if_entry)) {
825 if_info = (if_info_t *)if_entry->data;
826 printf("%d. %s\t", i++, if_info->name);
829 * Print the contents of the if_entry struct in a parseable format.
830 * Each if_entry element is tab-separated. Addresses are comma-
833 /* XXX - Make sure our description doesn't contain a tab */
834 if (if_info->vendor_description != NULL)
835 printf("%s\t", if_info->vendor_description);
839 /* XXX - Make sure our friendly name doesn't contain a tab */
840 if (if_info->friendly_name != NULL)
841 printf("%s\t", if_info->friendly_name);
845 printf("%i\t", if_info->type);
847 for (addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
848 addr = g_slist_next(addr)) {
849 if (addr != g_slist_nth(if_info->addrs, 0))
852 if_addr = (if_addr_t *)addr->data;
853 switch(if_addr->ifat_type) {
855 if (ws_inet_ntop4(&if_addr->addr.ip4_addr, addr_str,
857 printf("%s", addr_str);
859 printf("<unknown IPv4>");
863 if (ws_inet_ntop6(&if_addr->addr.ip6_addr,
864 addr_str, ADDRSTRLEN)) {
865 printf("%s", addr_str);
867 printf("<unknown IPv6>");
871 printf("<type unknown %i>", if_addr->ifat_type);
875 if (if_info->loopback)
876 printf("\tloopback");
880 printf("\t%s", if_info->extcap);
887 * If you change the machine-readable output format of this function,
888 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
891 print_machine_readable_if_capabilities(if_capabilities_t *caps)
894 data_link_info_t *data_link_info;
895 const gchar *desc_str;
898 /* Let our parent know we succeeded. */
899 pipe_write_block(2, SP_SUCCESS, NULL);
902 if (caps->can_set_rfmon)
906 for (lt_entry = caps->data_link_types; lt_entry != NULL;
907 lt_entry = g_list_next(lt_entry)) {
908 data_link_info = (data_link_info_t *)lt_entry->data;
909 if (data_link_info->description != NULL)
910 desc_str = data_link_info->description;
912 desc_str = "(not supported)";
913 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
923 /* Print the number of packets captured for each interface until we're killed. */
925 print_statistics_loop(gboolean machine_readable)
927 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
933 char errbuf[PCAP_ERRBUF_SIZE];
936 if_list = get_interface_list(&err, &err_str);
937 if (if_list == NULL) {
939 cmdarg_err("There are no interfaces on which a capture can be done");
941 cmdarg_err("%s", err_str);
947 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
948 if_info = (if_info_t *)if_entry->data;
951 /* On Linux nf* interfaces don't collect stats properly and don't allows multiple
952 * connections. We avoid collecting stats on them.
954 if (!strncmp(if_info->name, "nf", 2)) {
955 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Skipping interface %s for stats",
961 #ifdef HAVE_PCAP_OPEN
962 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
964 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
968 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
969 if_stat->name = g_strdup(if_info->name);
971 stat_list = g_list_append(stat_list, if_stat);
976 cmdarg_err("There are no interfaces on which a capture can be done");
981 /* Let our parent know we succeeded. */
982 pipe_write_block(2, SP_SUCCESS, NULL);
985 if (!machine_readable) {
986 printf("%-15s %10s %10s\n", "Interface", "Received",
991 while (global_ld.go) {
992 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
993 if_stat = (if_stat_t *)stat_entry->data;
994 pcap_stats(if_stat->pch, &ps);
996 if (!machine_readable) {
997 printf("%-15s %10u %10u\n", if_stat->name,
998 ps.ps_recv, ps.ps_drop);
1000 printf("%s\t%u\t%u\n", if_stat->name,
1001 ps.ps_recv, ps.ps_drop);
1006 /* If we have a dummy signal pipe check it */
1007 if (!signal_pipe_check_running()) {
1008 global_ld.go = FALSE;
1016 /* XXX - Not reached. Should we look for 'q' in stdin? */
1017 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1018 if_stat = (if_stat_t *)stat_entry->data;
1019 pcap_close(if_stat->pch);
1020 g_free(if_stat->name);
1023 g_list_free(stat_list);
1024 free_interface_list(if_list);
1032 capture_cleanup_handler(DWORD dwCtrlType)
1034 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1035 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1036 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1037 like SIGTERM at least when the machine's shutting down.
1039 For now, if we're running as a command rather than a capture child,
1040 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1041 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1042 in that way on UN*X.
1044 If we're not running as a capture child, we might be running as
1045 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1046 user logs out. (XXX - can we explicitly check whether we're
1047 running as a service?) */
1049 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1050 "Console: Control signal");
1051 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1052 "Console: Control signal, CtrlType: %u", dwCtrlType);
1054 /* Keep capture running if we're a service and a user logs off */
1055 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1056 capture_loop_stop();
1064 capture_cleanup_handler(int signum _U_)
1066 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1067 SIGTERM. We assume that if the user wanted it to keep running
1068 after they logged out, they'd have nohupped it. */
1070 /* Note: don't call g_log() in the signal handler: if we happened to be in
1071 * g_log() in process context when the signal came in, g_log will detect
1072 * the "recursion" and abort.
1075 capture_loop_stop();
1081 report_capture_count(gboolean reportit)
1083 /* Don't print this if we're a capture child. */
1084 if (!capture_child && reportit) {
1085 fprintf(stderr, "\rPackets captured: %d\n", global_ld.packet_count);
1086 /* stderr could be line buffered */
1094 report_counts_for_siginfo(void)
1096 report_capture_count(quiet);
1097 infoprint = FALSE; /* we just reported it */
1101 report_counts_siginfo(int signum _U_)
1103 int sav_errno = errno;
1105 /* If we've been told to delay printing, just set a flag asking
1106 that we print counts (if we're supposed to), otherwise print
1107 the count of packets captured (if we're supposed to). */
1111 report_counts_for_siginfo();
1114 #endif /* SIGINFO */
1117 exit_main(int status)
1120 /* Shutdown windows sockets */
1123 /* can be helpful for debugging */
1124 #ifdef DEBUG_DUMPCAP
1125 printf("Press any key\n");
1136 * If we were linked with libcap (not related to libpcap), make sure we have
1137 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1138 * (See comment in main() for details)
1141 relinquish_privs_except_capture(void)
1143 /* If 'started_with_special_privs' (ie: suid) then enable for
1144 * ourself the NET_ADMIN and NET_RAW capabilities and then
1145 * drop our suid privileges.
1147 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1148 * stuff we don't need (and shouldn't have).
1149 * CAP_NET_RAW: Packet capture (raw sockets).
1152 if (started_with_special_privs()) {
1153 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1154 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1156 cap_t caps = cap_init(); /* all capabilities initialized to off */
1158 print_caps("Pre drop, pre set");
1160 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1161 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1164 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1165 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1167 if (cap_set_proc(caps)) {
1168 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1170 print_caps("Pre drop, post set");
1172 relinquish_special_privs_perm();
1174 print_caps("Post drop, pre set");
1175 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1176 if (cap_set_proc(caps)) {
1177 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1179 print_caps("Post drop, post set");
1185 #endif /* HAVE_LIBCAP */
1187 /* Take care of byte order in the libpcap headers read from pipes.
1188 * (function taken from wiretap/libpcap.c) */
1190 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1193 /* Byte-swap the record header fields. */
1194 rechdr->ts_sec = GUINT32_SWAP_LE_BE(rechdr->ts_sec);
1195 rechdr->ts_usec = GUINT32_SWAP_LE_BE(rechdr->ts_usec);
1196 rechdr->incl_len = GUINT32_SWAP_LE_BE(rechdr->incl_len);
1197 rechdr->orig_len = GUINT32_SWAP_LE_BE(rechdr->orig_len);
1200 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1201 swapped, in order to match the BPF header layout.
1203 Unfortunately, some files were, according to a comment in the "libpcap"
1204 source, written with version 2.3 in their headers but without the
1205 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1206 would make no sense - we assume that we need to swap them. */
1207 if (hdr->version_major == 2 &&
1208 (hdr->version_minor < 3 ||
1209 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1212 temp = rechdr->orig_len;
1213 rechdr->orig_len = rechdr->incl_len;
1214 rechdr->incl_len = temp;
1218 /* Wrapper: distinguish between recv/read if we're reading on Windows,
1222 cap_pipe_read(int pipe_fd, char *buf, size_t sz, gboolean from_socket _U_)
1226 return recv(pipe_fd, buf, (int)sz, 0);
1231 return ws_read(pipe_fd, buf, sz);
1237 * Thread function that reads from a pipe and pushes the data
1238 * to the main application thread.
1241 * XXX Right now we use async queues for basic signaling. The main thread
1242 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1243 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1244 * Iff the read is successful cap_pipe_read pushes an item onto
1245 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1246 * the queues themselves (yet).
1248 * We might want to move some of the cap_pipe_dispatch logic here so that
1249 * we can let cap_thread_read run independently, queuing up multiple reads
1250 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1252 static void *cap_thread_read(void *arg)
1254 pcap_options *pcap_opts;
1257 DWORD b, last_err, bytes_read;
1263 pcap_opts = (pcap_options *)arg;
1264 while (pcap_opts->cap_pipe_err == PIPOK) {
1265 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1266 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1268 while (bytes_read < pcap_opts->cap_pipe_bytes_to_read) {
1269 if ((pcap_opts->from_cap_socket)
1275 b = cap_pipe_read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1276 pcap_opts->cap_pipe_bytes_to_read - bytes_read, pcap_opts->from_cap_socket);
1279 pcap_opts->cap_pipe_err = PIPEOF;
1283 pcap_opts->cap_pipe_err = PIPERR;
1294 /* If we try to use read() on a named pipe on Windows with partial
1295 * data it appears to return EOF.
1297 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1298 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1303 last_err = GetLastError();
1304 if (last_err == ERROR_MORE_DATA) {
1306 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1307 pcap_opts->cap_pipe_err = PIPEOF;
1311 pcap_opts->cap_pipe_err = PIPERR;
1314 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1315 pcap_opts->cap_pipe_err = PIPEOF;
1322 pcap_opts->cap_pipe_bytes_read = bytes_read;
1323 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1324 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1326 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1332 /* Provide select() functionality for a single file descriptor
1333 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1335 * Returns the same values as select.
1338 cap_pipe_select(int pipe_fd)
1341 struct timeval timeout;
1344 FD_SET(pipe_fd, &rfds);
1346 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1347 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1349 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1352 #define DEF_TCP_PORT 19000
1355 cap_open_socket(char *pipename, pcap_options *pcap_opts, char *errmsg, int errmsgl)
1357 char *sockname = pipename + 4;
1358 struct sockaddr_in sa;
1365 memset(&sa, 0, sizeof(sa));
1367 p = strchr(sockname, ':');
1369 len = strlen(sockname);
1370 port = DEF_TCP_PORT;
1374 port = strtoul(p + 1, &p, 10);
1375 if (*p || port > 65535) {
1384 g_snprintf ( buf,(gulong)len + 1, "%s", sockname );
1386 if (!ws_inet_pton4(buf, (guint32 *)&sa.sin_addr)) {
1390 sa.sin_family = AF_INET;
1391 sa.sin_port = g_htons((u_short)port);
1393 if (((fd = (int)socket(AF_INET, SOCK_STREAM, 0)) < 0) ||
1394 (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)) {
1396 LPTSTR errorText = NULL;
1399 lastError = WSAGetLastError();
1400 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
1401 FORMAT_MESSAGE_ALLOCATE_BUFFER |
1402 FORMAT_MESSAGE_IGNORE_INSERTS,
1403 NULL, lastError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
1404 (LPTSTR)&errorText, 0, NULL);
1406 g_snprintf(errmsg, errmsgl,
1407 "The capture session could not be initiated due to the socket error: \n"
1409 " %d: %S", lastError, errorText ? (char *)errorText : "Unknown");
1411 LocalFree(errorText);
1413 " %d: %s", errno, g_strerror(errno));
1415 pcap_opts->cap_pipe_err = PIPERR;
1418 cap_pipe_close(fd, TRUE);
1422 pcap_opts->from_cap_socket = TRUE;
1426 g_snprintf(errmsg, errmsgl,
1427 "The capture session could not be initiated because\n"
1428 "\"%s\" is not a valid socket specification", pipename);
1429 pcap_opts->cap_pipe_err = PIPERR;
1433 /* Wrapper: distinguish between closesocket on Windows; use ws_close
1437 cap_pipe_close(int pipe_fd, gboolean from_socket _U_)
1441 closesocket(pipe_fd);
1448 /* Mimic pcap_open_live() for pipe captures
1450 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1451 * open it, and read the header.
1453 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1454 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1456 cap_pipe_open_live(char *pipename,
1457 pcap_options *pcap_opts,
1458 struct pcap_hdr *hdr,
1459 char *errmsg, int errmsgl)
1462 ws_statb64 pipe_stat;
1463 struct sockaddr_un sa;
1467 interface_options interface_opts;
1469 char* extcap_pipe_name;
1470 gboolean extcap_pipe;
1474 int fd = -1, sel_ret;
1477 pcap_opts->cap_pipe_fd = -1;
1479 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1482 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1485 * XXX - this blocks until a pcap per-file header has been written to
1486 * the pipe, so it could block indefinitely.
1488 if (strcmp(pipename, "-") == 0) {
1490 fd = 0; /* read from stdin */
1492 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1494 } else if (!strncmp(pipename, "TCP@", 4)) {
1495 if ((fd = cap_open_socket(pipename, pcap_opts, errmsg, errmsgl)) < 0) {
1500 if (ws_stat64(pipename, &pipe_stat) < 0) {
1501 if (errno == ENOENT || errno == ENOTDIR)
1502 pcap_opts->cap_pipe_err = PIPNEXIST;
1504 g_snprintf(errmsg, errmsgl,
1505 "The capture session could not be initiated "
1506 "due to error getting information on pipe/socket: %s", g_strerror(errno));
1507 pcap_opts->cap_pipe_err = PIPERR;
1511 if (S_ISFIFO(pipe_stat.st_mode)) {
1512 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1514 g_snprintf(errmsg, errmsgl,
1515 "The capture session could not be initiated "
1516 "due to error on pipe open: %s", g_strerror(errno));
1517 pcap_opts->cap_pipe_err = PIPERR;
1520 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1521 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1523 g_snprintf(errmsg, errmsgl,
1524 "The capture session could not be initiated "
1525 "due to error on socket create: %s", g_strerror(errno));
1526 pcap_opts->cap_pipe_err = PIPERR;
1529 sa.sun_family = AF_UNIX;
1531 * The Single UNIX Specification says:
1533 * The size of sun_path has intentionally been left undefined.
1534 * This is because different implementations use different sizes.
1535 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1536 * of 104. Since most implementations originate from BSD versions,
1537 * the size is typically in the range 92 to 108.
1539 * Applications should not assume a particular length for sun_path
1540 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1544 * The <sys/un.h> header shall define the sockaddr_un structure,
1545 * which shall include at least the following members:
1547 * sa_family_t sun_family Address family.
1548 * char sun_path[] Socket pathname.
1550 * so we assume that it's an array, with a specified size,
1551 * and that the size reflects the maximum path length.
1553 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1554 /* Path name too long */
1555 g_snprintf(errmsg, errmsgl,
1556 "The capture session coud not be initiated "
1557 "due to error on socket connect: Path name too long");
1558 pcap_opts->cap_pipe_err = PIPERR;
1562 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1564 g_snprintf(errmsg, errmsgl,
1565 "The capture session coud not be initiated "
1566 "due to error on socket connect: %s", g_strerror(errno));
1567 pcap_opts->cap_pipe_err = PIPERR;
1572 if (S_ISCHR(pipe_stat.st_mode)) {
1574 * Assume the user specified an interface on a system where
1575 * interfaces are in /dev. Pretend we haven't seen it.
1577 pcap_opts->cap_pipe_err = PIPNEXIST;
1579 g_snprintf(errmsg, errmsgl,
1580 "The capture session could not be initiated because\n"
1581 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1582 pcap_opts->cap_pipe_err = PIPERR;
1587 #define PIPE_STR "\\pipe\\"
1588 /* Under Windows, named pipes _must_ have the form
1589 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1591 pncopy = g_strdup(pipename);
1592 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1593 pos = strchr(pncopy + 3, '\\');
1594 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1601 g_snprintf(errmsg, errmsgl,
1602 "The capture session could not be initiated because\n"
1603 "\"%s\" is neither an interface nor a pipe", pipename);
1604 pcap_opts->cap_pipe_err = PIPNEXIST;
1608 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, 0);
1610 extcap_pipe_name = g_strconcat("\\\\.\\pipe\\", EXTCAP_PIPE_PREFIX, NULL);
1611 extcap_pipe = strstr(interface_opts.name, extcap_pipe_name) ? TRUE : FALSE;
1612 g_free(extcap_pipe_name);
1615 /* Wait for the pipe to appear */
1620 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1623 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1624 OPEN_EXISTING, 0, NULL);
1626 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1629 if (GetLastError() != ERROR_PIPE_BUSY) {
1630 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
1631 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1632 g_snprintf(errmsg, errmsgl,
1633 "The capture session on \"%s\" could not be started "
1634 "due to error on pipe open: %s (error %d)",
1635 pipename, utf_16to8(err_str), GetLastError());
1637 pcap_opts->cap_pipe_err = PIPERR;
1641 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1642 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
1643 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1644 g_snprintf(errmsg, errmsgl,
1645 "The capture session on \"%s\" timed out during "
1646 "pipe open: %s (error %d)",
1647 pipename, utf_16to8(err_str), GetLastError());
1649 pcap_opts->cap_pipe_err = PIPERR;
1656 pcap_opts->from_cap_pipe = TRUE;
1659 if (pcap_opts->from_cap_socket)
1662 /* read the pcap header */
1664 while (bytes_read < sizeof magic) {
1666 g_snprintf(errmsg, errmsgl, "Invalid file descriptor");
1670 sel_ret = cap_pipe_select(fd);
1672 g_snprintf(errmsg, errmsgl,
1673 "Unexpected error from select: %s", g_strerror(errno));
1675 } else if (sel_ret > 0) {
1676 b = cap_pipe_read(fd, ((char *)&magic)+bytes_read,
1677 sizeof magic-bytes_read,
1678 pcap_opts->from_cap_socket);
1681 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1683 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1693 #if GLIB_CHECK_VERSION(2,31,0)
1694 g_thread_new("cap_pipe_open_live", &cap_thread_read, pcap_opts);
1696 g_thread_create(&cap_thread_read, pcap_opts, FALSE, NULL);
1699 pcap_opts->cap_pipe_buf = (char *) &magic;
1700 pcap_opts->cap_pipe_bytes_read = 0;
1701 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1702 /* We don't have to worry about cap_pipe_read_mtx here */
1703 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1704 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1705 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1706 if (pcap_opts->cap_pipe_bytes_read == 0)
1707 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1709 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1718 case PCAP_NSEC_MAGIC:
1719 /* Host that wrote it has our byte order, and was running
1720 a program using either standard or ss990417 libpcap. */
1721 pcap_opts->cap_pipe_byte_swapped = FALSE;
1722 pcap_opts->cap_pipe_modified = FALSE;
1723 pcap_opts->ts_nsec = magic == PCAP_NSEC_MAGIC;
1725 case PCAP_MODIFIED_MAGIC:
1726 /* Host that wrote it has our byte order, but was running
1727 a program using either ss990915 or ss991029 libpcap. */
1728 pcap_opts->cap_pipe_byte_swapped = FALSE;
1729 pcap_opts->cap_pipe_modified = TRUE;
1731 case PCAP_SWAPPED_MAGIC:
1732 case PCAP_SWAPPED_NSEC_MAGIC:
1733 /* Host that wrote it has a byte order opposite to ours,
1734 and was running a program using either standard or
1735 ss990417 libpcap. */
1736 pcap_opts->cap_pipe_byte_swapped = TRUE;
1737 pcap_opts->cap_pipe_modified = FALSE;
1738 pcap_opts->ts_nsec = magic == PCAP_SWAPPED_NSEC_MAGIC;
1740 case PCAP_SWAPPED_MODIFIED_MAGIC:
1741 /* Host that wrote it out has a byte order opposite to
1742 ours, and was running a program using either ss990915
1743 or ss991029 libpcap. */
1744 pcap_opts->cap_pipe_byte_swapped = TRUE;
1745 pcap_opts->cap_pipe_modified = TRUE;
1748 /* Not a "libpcap" type we know about. */
1749 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1754 if (pcap_opts->from_cap_socket)
1757 /* Read the rest of the header */
1759 while (bytes_read < sizeof(struct pcap_hdr)) {
1760 sel_ret = cap_pipe_select(fd);
1762 g_snprintf(errmsg, errmsgl,
1763 "Unexpected error from select: %s", g_strerror(errno));
1765 } else if (sel_ret > 0) {
1766 b = cap_pipe_read(fd, ((char *)hdr)+bytes_read,
1767 sizeof(struct pcap_hdr) - bytes_read,
1768 pcap_opts->from_cap_socket);
1771 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1773 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1783 pcap_opts->cap_pipe_buf = (char *) hdr;
1784 pcap_opts->cap_pipe_bytes_read = 0;
1785 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1786 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1787 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1788 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1789 if (pcap_opts->cap_pipe_bytes_read == 0)
1790 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1792 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1799 if (pcap_opts->cap_pipe_byte_swapped) {
1800 /* Byte-swap the header fields about which we care. */
1801 hdr->version_major = GUINT16_SWAP_LE_BE(hdr->version_major);
1802 hdr->version_minor = GUINT16_SWAP_LE_BE(hdr->version_minor);
1803 hdr->snaplen = GUINT32_SWAP_LE_BE(hdr->snaplen);
1804 hdr->network = GUINT32_SWAP_LE_BE(hdr->network);
1806 pcap_opts->linktype = hdr->network;
1808 if (hdr->version_major < 2) {
1809 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1813 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1814 pcap_opts->cap_pipe_err = PIPOK;
1815 pcap_opts->cap_pipe_fd = fd;
1819 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1820 pcap_opts->cap_pipe_err = PIPERR;
1821 cap_pipe_close(fd, pcap_opts->from_cap_socket);
1822 pcap_opts->cap_pipe_fd = -1;
1826 /* We read one record from the pipe, take care of byte order in the record
1827 * header, write the record to the capture file, and update capture statistics. */
1829 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
1831 struct pcap_pkthdr phdr;
1832 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1835 #if !GLIB_CHECK_VERSION(2,31,18)
1843 #ifdef LOG_CAPTURE_VERBOSE
1844 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
1847 switch (pcap_opts->cap_pipe_state) {
1849 case STATE_EXPECT_REC_HDR:
1851 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
1854 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
1855 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
1856 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
1857 pcap_opts->cap_pipe_bytes_read = 0;
1860 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
1861 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1862 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1867 case STATE_READ_REC_HDR:
1869 if (pcap_opts->from_cap_socket)
1872 b = cap_pipe_read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
1873 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read, pcap_opts->from_cap_socket);
1876 result = PD_PIPE_EOF;
1878 result = PD_PIPE_ERR;
1881 pcap_opts->cap_pipe_bytes_read += b;
1885 #if GLIB_CHECK_VERSION(2,31,18)
1886 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
1888 g_get_current_time(&wait_time);
1889 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
1890 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
1892 if (pcap_opts->cap_pipe_err == PIPEOF) {
1893 result = PD_PIPE_EOF;
1895 } else if (pcap_opts->cap_pipe_err == PIPERR) {
1896 result = PD_PIPE_ERR;
1904 if (pcap_opts->cap_pipe_bytes_read < pcap_opts->cap_pipe_bytes_to_read)
1906 result = PD_REC_HDR_READ;
1909 case STATE_EXPECT_DATA:
1911 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
1914 pcap_opts->cap_pipe_state = STATE_READ_DATA;
1915 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
1916 pcap_opts->cap_pipe_bytes_read = 0;
1919 pcap_opts->cap_pipe_buf = (char *) data;
1920 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1921 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1926 case STATE_READ_DATA:
1928 if (pcap_opts->from_cap_socket)
1931 b = cap_pipe_read(pcap_opts->cap_pipe_fd,
1932 data+pcap_opts->cap_pipe_bytes_read,
1933 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read,
1934 pcap_opts->from_cap_socket);
1937 result = PD_PIPE_EOF;
1939 result = PD_PIPE_ERR;
1942 pcap_opts->cap_pipe_bytes_read += b;
1947 #if GLIB_CHECK_VERSION(2,31,18)
1948 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
1950 g_get_current_time(&wait_time);
1951 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
1952 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
1953 #endif /* GLIB_CHECK_VERSION(2,31,18) */
1954 if (pcap_opts->cap_pipe_err == PIPEOF) {
1955 result = PD_PIPE_EOF;
1957 } else if (pcap_opts->cap_pipe_err == PIPERR) {
1958 result = PD_PIPE_ERR;
1966 if (pcap_opts->cap_pipe_bytes_read < pcap_opts->cap_pipe_bytes_to_read)
1968 result = PD_DATA_READ;
1972 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
1975 } /* switch (pcap_opts->cap_pipe_state) */
1978 * We've now read as much data as we were expecting, so process it.
1982 case PD_REC_HDR_READ:
1983 /* We've read the header. Take care of byte order. */
1984 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
1985 &pcap_opts->cap_pipe_rechdr.hdr);
1986 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
1987 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
1988 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
1992 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
1993 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
1996 /* no data to read? fall through */
1999 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2000 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2001 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2002 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2003 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2006 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2008 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2010 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2014 pcap_opts->cap_pipe_err = PIPEOF;
2019 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
2020 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2021 g_snprintf(errmsg, errmsgl,
2022 "Error reading from pipe: %s (error %d)",
2023 utf_16to8(err_str), GetLastError());
2026 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2034 pcap_opts->cap_pipe_err = PIPERR;
2035 /* Return here rather than inside the switch to prevent GCC warning */
2040 /** Open the capture input file (pcap or capture pipe).
2041 * Returns TRUE if it succeeds, FALSE otherwise. */
2043 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2044 char *errmsg, size_t errmsg_len,
2045 char *secondary_errmsg, size_t secondary_errmsg_len)
2047 gchar open_err_str[PCAP_ERRBUF_SIZE];
2048 gchar *sync_msg_str;
2049 interface_options interface_opts;
2050 pcap_options *pcap_opts;
2054 WORD wVersionRequested;
2058 /* XXX - opening Winsock on tshark? */
2060 /* Initialize Windows Socket if we are in a Win32 OS
2061 This needs to be done before querying the interface for network/netmask */
2063 /* XXX - do we really require 1.1 or earlier?
2064 Are there any versions that support only 2.0 or higher? */
2065 wVersionRequested = MAKEWORD(1, 1);
2066 err = WSAStartup(wVersionRequested, &wsaData);
2070 case WSASYSNOTREADY:
2071 g_snprintf(errmsg, (gulong) errmsg_len,
2072 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2075 case WSAVERNOTSUPPORTED:
2076 g_snprintf(errmsg, (gulong) errmsg_len,
2077 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2078 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2081 case WSAEINPROGRESS:
2082 g_snprintf(errmsg, (gulong) errmsg_len,
2083 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2087 g_snprintf(errmsg, (gulong) errmsg_len,
2088 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2092 g_snprintf(errmsg, (gulong) errmsg_len,
2093 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2097 g_snprintf(errmsg, (gulong) errmsg_len,
2098 "Couldn't initialize Windows Sockets: error %d", err);
2101 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2105 if ((use_threads == FALSE) &&
2106 (capture_opts->ifaces->len > 1)) {
2107 g_snprintf(errmsg, (gulong) errmsg_len,
2108 "Using threads is required for capturing on multiple interfaces.");
2112 for (i = 0; i < capture_opts->ifaces->len; i++) {
2113 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2114 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2115 if (pcap_opts == NULL) {
2116 g_snprintf(errmsg, (gulong) errmsg_len,
2117 "Could not allocate memory.");
2120 pcap_opts->received = 0;
2121 pcap_opts->dropped = 0;
2122 pcap_opts->flushed = 0;
2123 pcap_opts->pcap_h = NULL;
2124 #ifdef MUST_DO_SELECT
2125 pcap_opts->pcap_fd = -1;
2127 pcap_opts->pcap_err = FALSE;
2128 pcap_opts->interface_id = i;
2129 pcap_opts->tid = NULL;
2130 pcap_opts->snaplen = 0;
2131 pcap_opts->linktype = -1;
2132 pcap_opts->ts_nsec = FALSE;
2133 pcap_opts->from_cap_pipe = FALSE;
2134 pcap_opts->from_cap_socket = FALSE;
2135 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2136 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2138 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2140 pcap_opts->cap_pipe_fd = -1;
2141 pcap_opts->cap_pipe_modified = FALSE;
2142 pcap_opts->cap_pipe_byte_swapped = FALSE;
2144 pcap_opts->cap_pipe_buf = NULL;
2146 pcap_opts->cap_pipe_bytes_to_read = 0;
2147 pcap_opts->cap_pipe_bytes_read = 0;
2148 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2149 pcap_opts->cap_pipe_err = PIPOK;
2151 #if GLIB_CHECK_VERSION(2,31,0)
2152 pcap_opts->cap_pipe_read_mtx = g_malloc(sizeof(GMutex));
2153 g_mutex_init(pcap_opts->cap_pipe_read_mtx);
2155 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2157 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2158 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2160 g_array_append_val(ld->pcaps, pcap_opts);
2162 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2163 pcap_opts->pcap_h = open_capture_device(capture_opts, &interface_opts,
2164 CAP_READ_TIMEOUT, &open_err_str);
2166 if (pcap_opts->pcap_h != NULL) {
2167 /* we've opened "iface" as a network device */
2169 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
2170 /* Find out if we're getting nanosecond-precision time stamps */
2171 pcap_opts->ts_nsec = have_high_resolution_timestamp(pcap_opts->pcap_h);
2174 #if defined(HAVE_PCAP_SETSAMPLING)
2175 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2176 struct pcap_samp *samp;
2178 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2179 switch (interface_opts.sampling_method) {
2180 case CAPTURE_SAMP_BY_COUNT:
2181 samp->method = PCAP_SAMP_1_EVERY_N;
2184 case CAPTURE_SAMP_BY_TIMER:
2185 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2189 sync_msg_str = g_strdup_printf(
2190 "Unknown sampling method %d specified,\n"
2191 "continue without packet sampling",
2192 interface_opts.sampling_method);
2193 report_capture_error("Couldn't set the capture "
2194 "sampling", sync_msg_str);
2195 g_free(sync_msg_str);
2197 samp->value = interface_opts.sampling_param;
2199 report_capture_error("Couldn't set the capture sampling",
2200 "Cannot get packet sampling data structure");
2205 /* setting the data link type only works on real interfaces */
2206 if (!set_pcap_datalink(pcap_opts->pcap_h, interface_opts.linktype,
2207 interface_opts.name,
2209 secondary_errmsg, secondary_errmsg_len)) {
2212 pcap_opts->linktype = get_pcap_datalink(pcap_opts->pcap_h, interface_opts.name);
2214 /* We couldn't open "iface" as a network device. */
2215 /* Try to open it as a pipe */
2216 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2219 if (pcap_opts->cap_pipe_fd == -1) {
2221 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2223 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2225 * We tried opening as an interface, and that failed,
2226 * so we tried to open it as a pipe, but the pipe
2227 * doesn't exist. Report the error message for
2230 get_capture_device_open_failure_messages(open_err_str,
2231 interface_opts.name,
2235 secondary_errmsg_len);
2238 * Else pipe (or file) does exist and cap_pipe_open_live() has
2243 /* cap_pipe_open_live() succeeded; don't want
2244 error message from pcap_open_live() */
2245 open_err_str[0] = '\0';
2249 /* XXX - will this work for tshark? */
2250 #ifdef MUST_DO_SELECT
2251 if (!pcap_opts->from_cap_pipe) {
2252 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2253 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2255 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2260 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2261 returned a warning; print it, but keep capturing. */
2262 if (open_err_str[0] != '\0') {
2263 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2264 report_capture_error(sync_msg_str, "");
2265 g_free(sync_msg_str);
2267 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2268 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2271 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2272 /* to remove any suid privileges. */
2273 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2274 /* (euid/egid have already previously been set to ruid/rgid. */
2275 /* (See comment in main() for details) */
2277 relinquish_special_privs_perm();
2279 relinquish_all_capabilities();
2284 /* close the capture input file (pcap or capture pipe) */
2285 static void capture_loop_close_input(loop_data *ld)
2288 pcap_options *pcap_opts;
2290 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2292 for (i = 0; i < ld->pcaps->len; i++) {
2293 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2294 /* if open, close the capture pipe "input file" */
2295 if (pcap_opts->cap_pipe_fd >= 0) {
2296 g_assert(pcap_opts->from_cap_pipe);
2297 cap_pipe_close(pcap_opts->cap_pipe_fd, pcap_opts->from_cap_socket);
2298 pcap_opts->cap_pipe_fd = -1;
2301 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2302 CloseHandle(pcap_opts->cap_pipe_h);
2303 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2306 /* if open, close the pcap "input file" */
2307 if (pcap_opts->pcap_h != NULL) {
2308 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2309 pcap_close(pcap_opts->pcap_h);
2310 pcap_opts->pcap_h = NULL;
2317 /* Shut down windows sockets */
2323 /* init the capture filter */
2324 static initfilter_status_t
2325 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2326 const gchar * name, const gchar * cfilter)
2328 struct bpf_program fcode;
2330 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2332 /* capture filters only work on real interfaces */
2333 if (cfilter && !from_cap_pipe) {
2334 /* A capture filter was specified; set it up. */
2335 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2336 /* Treat this specially - our caller might try to compile this
2337 as a display filter and, if that succeeds, warn the user that
2338 the display and capture filter syntaxes are different. */
2339 return INITFILTER_BAD_FILTER;
2341 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2342 #ifdef HAVE_PCAP_FREECODE
2343 pcap_freecode(&fcode);
2345 return INITFILTER_OTHER_ERROR;
2347 #ifdef HAVE_PCAP_FREECODE
2348 pcap_freecode(&fcode);
2352 return INITFILTER_NO_ERROR;
2356 /* set up to write to the already-opened capture output file/files */
2358 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2362 pcap_options *pcap_opts;
2363 interface_options interface_opts;
2364 gboolean successful;
2366 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2368 if ((capture_opts->use_pcapng == FALSE) &&
2369 (capture_opts->ifaces->len > 1)) {
2370 g_snprintf(errmsg, errmsg_len,
2371 "Using PCAPNG is required for capturing on multiple interfaces. Use the -n option.");
2375 /* Set up to write to the capture file. */
2376 if (capture_opts->multi_files_on) {
2377 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2379 ld->pdh = ws_fdopen(ld->save_file_fd, "wb");
2380 if (ld->pdh == NULL) {
2385 if (capture_opts->use_pcapng) {
2387 GString *os_info_str;
2389 os_info_str = g_string_new("");
2390 get_os_version_info(os_info_str);
2392 appname = g_strdup_printf("Dumpcap (Wireshark) %s", get_ws_vcs_version_info());
2393 successful = pcapng_write_session_header_block(ld->pdh,
2394 (const char *)capture_opts->capture_comment, /* Comment*/
2396 os_info_str->str, /* OS*/
2398 -1, /* section_length */
2403 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2404 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2405 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2406 if (pcap_opts->from_cap_pipe) {
2407 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2409 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2411 successful = pcapng_write_interface_description_block(global_ld.pdh,
2412 NULL, /* OPT_COMMENT 1 */
2413 interface_opts.name, /* IDB_NAME 2 */
2414 interface_opts.descr, /* IDB_DESCRIPTION 3 */
2415 interface_opts.cfilter, /* IDB_FILTER 11 */
2416 os_info_str->str, /* IDB_OS 12 */
2417 pcap_opts->linktype,
2419 &(global_ld.bytes_written),
2420 0, /* IDB_IF_SPEED 8 */
2421 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
2425 g_string_free(os_info_str, TRUE);
2428 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2429 if (pcap_opts->from_cap_pipe) {
2430 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2432 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2434 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2435 pcap_opts->ts_nsec, &ld->bytes_written, &err);
2443 if (ld->pdh == NULL) {
2444 /* We couldn't set up to write to the capture file. */
2445 /* XXX - use cf_open_error_message from tshark instead? */
2450 g_snprintf(errmsg, errmsg_len,
2451 "The file to which the capture would be"
2452 " saved (\"%s\") could not be opened: Error %d.",
2453 capture_opts->save_file, err);
2455 g_snprintf(errmsg, errmsg_len,
2456 "The file to which the capture would be"
2457 " saved (\"%s\") could not be opened: %s.",
2458 capture_opts->save_file, g_strerror(err));
2470 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2474 pcap_options *pcap_opts;
2475 guint64 end_time = create_timestamp();
2477 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2479 if (capture_opts->multi_files_on) {
2480 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2482 if (capture_opts->use_pcapng) {
2483 for (i = 0; i < global_ld.pcaps->len; i++) {
2484 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2485 if (!pcap_opts->from_cap_pipe) {
2486 guint64 isb_ifrecv, isb_ifdrop;
2487 struct pcap_stat stats;
2489 if (pcap_stats(pcap_opts->pcap_h, &stats) >= 0) {
2490 isb_ifrecv = pcap_opts->received;
2491 isb_ifdrop = stats.ps_drop + pcap_opts->dropped + pcap_opts->flushed;
2493 isb_ifrecv = G_MAXUINT64;
2494 isb_ifdrop = G_MAXUINT64;
2496 pcapng_write_interface_statistics_block(ld->pdh,
2499 "Counters provided by dumpcap",
2508 if (fclose(ld->pdh) == EOF) {
2509 if (err_close != NULL) {
2519 /* dispatch incoming packets (pcap or capture pipe)
2521 * Waits for incoming packets to be available, and calls pcap_dispatch()
2522 * to cause them to be processed.
2524 * Returns the number of packets which were processed.
2526 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2527 * packet-batching behaviour does not cause packets to get held back
2531 capture_loop_dispatch(loop_data *ld,
2532 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2535 gint packet_count_before;
2536 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2541 packet_count_before = ld->packet_count;
2542 if (pcap_opts->from_cap_pipe) {
2543 /* dispatch from capture pipe */
2544 #ifdef LOG_CAPTURE_VERBOSE
2545 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2548 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2550 if (sel_ret < 0 && errno != EINTR) {
2551 g_snprintf(errmsg, errmsg_len,
2552 "Unexpected error from select: %s", g_strerror(errno));
2553 report_capture_error(errmsg, please_report);
2558 * "select()" says we can read from the pipe without blocking
2561 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2571 /* dispatch from pcap */
2572 #ifdef MUST_DO_SELECT
2574 * If we have "pcap_get_selectable_fd()", we use it to get the
2575 * descriptor on which to select; if that's -1, it means there
2576 * is no descriptor on which you can do a "select()" (perhaps
2577 * because you're capturing on a special device, and that device's
2578 * driver unfortunately doesn't support "select()", in which case
2579 * we don't do the select - which means it might not be possible
2580 * to stop a capture until a packet arrives. If that's unacceptable,
2581 * plead with whoever supplies the software for that device to add
2582 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2583 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2584 * later, so it can use pcap_breakloop().
2586 #ifdef LOG_CAPTURE_VERBOSE
2587 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2589 if (pcap_opts->pcap_fd != -1) {
2590 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2593 * "select()" says we can read from it without blocking; go for
2596 * We don't have pcap_breakloop(), so we only process one packet
2597 * per pcap_dispatch() call, to allow a signal to stop the
2598 * processing immediately, rather than processing all packets
2599 * in a batch before quitting.
2602 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2604 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2608 /* Error, rather than pcap_breakloop(). */
2609 pcap_opts->pcap_err = TRUE;
2611 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2614 if (sel_ret < 0 && errno != EINTR) {
2615 g_snprintf(errmsg, errmsg_len,
2616 "Unexpected error from select: %s", g_strerror(errno));
2617 report_capture_error(errmsg, please_report);
2623 #endif /* MUST_DO_SELECT */
2625 /* dispatch from pcap without select */
2627 #ifdef LOG_CAPTURE_VERBOSE
2628 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2632 * On Windows, we don't support asynchronously telling a process to
2633 * stop capturing; instead, we check for an indication on a pipe
2634 * after processing packets. We therefore process only one packet
2635 * at a time, so that we can check the pipe after every packet.
2638 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2640 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2644 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2646 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2651 /* Error, rather than pcap_breakloop(). */
2652 pcap_opts->pcap_err = TRUE;
2654 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2656 #else /* pcap_next_ex */
2657 #ifdef LOG_CAPTURE_VERBOSE
2658 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2660 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2663 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2664 * see https://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2665 * This should be fixed in the WinPcap 4.0 alpha release.
2667 * For reference, an example remote interface:
2668 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2671 /* emulate dispatch from pcap */
2674 struct pcap_pkthdr *pkt_header;
2679 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2681 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2683 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2688 pcap_opts->pcap_err = TRUE;
2692 #endif /* pcap_next_ex */
2696 #ifdef LOG_CAPTURE_VERBOSE
2697 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2700 return ld->packet_count - packet_count_before;
2704 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2705 * want to grab only the characters between the '{' and '}' delimiters.
2707 * Returns a GString that must be freed with g_string_free(). */
2709 isolate_uuid(const char *iface)
2714 ptr = strchr(iface, '{');
2716 return g_string_new(iface);
2717 gstr = g_string_new(ptr + 1);
2719 ptr = strchr(gstr->str, '}');
2723 gstr = g_string_truncate(gstr, ptr - gstr->str);
2728 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2729 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2731 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2732 char *errmsg, int errmsg_len)
2735 gchar *capfile_name;
2736 gchar *prefix, *suffix;
2737 gboolean is_tempfile;
2739 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2740 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2742 if (capture_opts->save_file != NULL) {
2743 /* We return to the caller while the capture is in progress.
2744 * Therefore we need to take a copy of save_file in
2745 * case the caller destroys it after we return.
2747 capfile_name = g_strdup(capture_opts->save_file);
2749 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2750 if (capture_opts->multi_files_on) {
2751 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2752 g_snprintf(errmsg, errmsg_len,
2753 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2754 g_free(capfile_name);
2757 if (strcmp(capfile_name, "-") == 0) {
2758 /* write to stdout */
2761 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2762 _setmode(1, O_BINARY);
2765 } /* if (...output_to_pipe ... */
2768 if (capture_opts->multi_files_on) {
2769 /* ringbuffer is enabled */
2770 *save_file_fd = ringbuf_init(capfile_name,
2771 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2772 capture_opts->group_read_access);
2774 /* we need the ringbuf name */
2775 if (*save_file_fd != -1) {
2776 g_free(capfile_name);
2777 capfile_name = g_strdup(ringbuf_current_filename());
2780 /* Try to open/create the specified file for use as a capture buffer. */
2781 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2782 (capture_opts->group_read_access) ? 0640 : 0600);
2785 is_tempfile = FALSE;
2787 /* Choose a random name for the temporary capture buffer */
2788 if (global_capture_opts.ifaces->len > 1) {
2789 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
2793 basename = g_path_get_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).console_display_name);
2795 /* use the generic portion of the interface guid to form the basis of the filename */
2796 if (strncmp("NPF_{", basename, 5)==0)
2798 /* we have a windows guid style device name, extract the guid digits as the basis of the filename */
2800 iface = isolate_uuid(basename);
2802 basename = g_strdup(iface->str);
2803 g_string_free(iface, TRUE);
2806 /* generate the temp file name prefix and suffix */
2807 if (capture_opts->use_pcapng) {
2808 prefix = g_strconcat("wireshark_", basename, NULL);
2811 prefix = g_strconcat("wireshark_", basename, NULL);
2816 *save_file_fd = create_tempfile(&tmpname, prefix, suffix);
2818 capfile_name = g_strdup(tmpname);
2822 /* did we fail to open the output file? */
2823 if (*save_file_fd == -1) {
2825 g_snprintf(errmsg, errmsg_len,
2826 "The temporary file to which the capture would be saved (\"%s\") "
2827 "could not be opened: %s.", capfile_name, g_strerror(errno));
2829 if (capture_opts->multi_files_on) {
2830 ringbuf_error_cleanup();
2833 g_snprintf(errmsg, errmsg_len,
2834 "The file to which the capture would be saved (\"%s\") "
2835 "could not be opened: %s.", capfile_name,
2838 g_free(capfile_name);
2842 if (capture_opts->save_file != NULL) {
2843 g_free(capture_opts->save_file);
2845 capture_opts->save_file = capfile_name;
2846 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2847 "g_free(capfile_name)". */
2853 /* Do the work of handling either the file size or file duration capture
2854 conditions being reached, and switching files or stopping. */
2856 do_file_switch_or_stop(capture_options *capture_opts,
2857 condition *cnd_autostop_files,
2858 condition *cnd_autostop_size,
2859 condition *cnd_file_duration)
2862 pcap_options *pcap_opts;
2863 interface_options interface_opts;
2864 gboolean successful;
2866 if (capture_opts->multi_files_on) {
2867 if (cnd_autostop_files != NULL &&
2868 cnd_eval(cnd_autostop_files, (guint64)++global_ld.autostop_files)) {
2869 /* no files left: stop here */
2870 global_ld.go = FALSE;
2874 /* Switch to the next ringbuffer file */
2875 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2876 &global_ld.save_file_fd, &global_ld.err)) {
2878 /* File switch succeeded: reset the conditions */
2879 global_ld.bytes_written = 0;
2880 if (capture_opts->use_pcapng) {
2882 GString *os_info_str;
2884 os_info_str = g_string_new("");
2885 get_os_version_info(os_info_str);
2887 appname = g_strdup_printf("Dumpcap (Wireshark) %s", get_ws_vcs_version_info());
2888 successful = pcapng_write_session_header_block(global_ld.pdh,
2891 os_info_str->str, /* OS */
2893 -1, /* section_length */
2894 &(global_ld.bytes_written),
2898 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2899 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2900 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2901 successful = pcapng_write_interface_description_block(global_ld.pdh,
2902 NULL, /* OPT_COMMENT 1 */
2903 interface_opts.name, /* IDB_NAME 2 */
2904 interface_opts.descr, /* IDB_DESCRIPTION 3 */
2905 interface_opts.cfilter, /* IDB_FILTER 11 */
2906 os_info_str->str, /* IDB_OS 12 */
2907 pcap_opts->linktype,
2909 &(global_ld.bytes_written),
2910 0, /* IDB_IF_SPEED 8 */
2911 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
2915 g_string_free(os_info_str, TRUE);
2918 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
2919 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
2920 pcap_opts->ts_nsec, &global_ld.bytes_written, &global_ld.err);
2923 fclose(global_ld.pdh);
2924 global_ld.pdh = NULL;
2925 global_ld.go = FALSE;
2928 if (cnd_autostop_size)
2929 cnd_reset(cnd_autostop_size);
2930 if (cnd_file_duration)
2931 cnd_reset(cnd_file_duration);
2932 fflush(global_ld.pdh);
2934 report_packet_count(global_ld.inpkts_to_sync_pipe);
2935 global_ld.inpkts_to_sync_pipe = 0;
2936 report_new_capture_file(capture_opts->save_file);
2938 /* File switch failed: stop here */
2939 global_ld.go = FALSE;
2943 /* single file, stop now */
2944 global_ld.go = FALSE;
2951 pcap_read_handler(void* arg)
2953 pcap_options *pcap_opts;
2954 char errmsg[MSG_MAX_LENGTH+1];
2956 pcap_opts = (pcap_options *)arg;
2958 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
2959 pcap_opts->interface_id);
2961 while (global_ld.go) {
2962 /* dispatch incoming packets */
2963 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
2965 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
2966 pcap_opts->interface_id);
2967 g_thread_exit(NULL);
2971 /* Do the low-level work of a capture.
2972 Returns TRUE if it succeeds, FALSE otherwise. */
2974 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
2977 DWORD upd_time, cur_time; /* GetTickCount() returns a "DWORD" (which is 'unsigned long') */
2979 struct timeval upd_time, cur_time;
2983 condition *cnd_file_duration = NULL;
2984 condition *cnd_autostop_files = NULL;
2985 condition *cnd_autostop_size = NULL;
2986 condition *cnd_autostop_duration = NULL;
2989 gboolean cfilter_error = FALSE;
2990 char errmsg[MSG_MAX_LENGTH+1];
2991 char secondary_errmsg[MSG_MAX_LENGTH+1];
2992 pcap_options *pcap_opts;
2993 interface_options interface_opts;
2994 guint i, error_index = 0;
2997 *secondary_errmsg = '\0';
2999 /* init the loop data */
3000 global_ld.go = TRUE;
3001 global_ld.packet_count = 0;
3003 global_ld.report_packet_count = FALSE;
3005 if (capture_opts->has_autostop_packets)
3006 global_ld.packet_max = capture_opts->autostop_packets;
3008 global_ld.packet_max = 0; /* no limit */
3009 global_ld.inpkts_to_sync_pipe = 0;
3010 global_ld.err = 0; /* no error seen yet */
3011 global_ld.pdh = NULL;
3012 global_ld.autostop_files = 0;
3013 global_ld.save_file_fd = -1;
3015 /* We haven't yet gotten the capture statistics. */
3016 *stats_known = FALSE;
3018 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3019 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3021 /* open the "input file" from network interface or capture pipe */
3022 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3023 secondary_errmsg, sizeof(secondary_errmsg))) {
3026 for (i = 0; i < capture_opts->ifaces->len; i++) {
3027 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3028 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3029 /* init the input filter from the network interface (capture pipe will do nothing) */
3031 * When remote capturing WinPCap crashes when the capture filter
3032 * is NULL. This might be a bug in WPCap. Therefore we provide an empty
3035 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3036 interface_opts.name,
3037 interface_opts.cfilter?interface_opts.cfilter:"")) {
3039 case INITFILTER_NO_ERROR:
3042 case INITFILTER_BAD_FILTER:
3043 cfilter_error = TRUE;
3045 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3048 case INITFILTER_OTHER_ERROR:
3049 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3050 pcap_geterr(pcap_opts->pcap_h));
3051 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3056 /* If we're supposed to write to a capture file, open it for output
3057 (temporary/specified name/ringbuffer) */
3058 if (capture_opts->saving_to_file) {
3059 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3060 errmsg, sizeof(errmsg))) {
3064 /* set up to write to the already-opened capture output file/files */
3065 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3070 /* XXX - capture SIGTERM and close the capture, in case we're on a
3071 Linux 2.0[.x] system and you have to explicitly close the capture
3072 stream in order to turn promiscuous mode off? We need to do that
3073 in other places as well - and I don't think that works all the
3074 time in any case, due to libpcap bugs. */
3076 /* Well, we should be able to start capturing.
3078 Sync out the capture file, so the header makes it to the file system,
3079 and send a "capture started successfully and capture file created"
3080 message to our parent so that they'll open the capture file and
3081 update its windows to indicate that we have a live capture in
3083 fflush(global_ld.pdh);
3084 report_new_capture_file(capture_opts->save_file);
3087 /* initialize capture stop (and alike) conditions */
3088 init_capture_stop_conditions();
3089 /* create stop conditions */
3090 if (capture_opts->has_autostop_filesize) {
3091 if (capture_opts->autostop_filesize > (((guint32)INT_MAX + 1) / 1000)) {
3092 capture_opts->autostop_filesize = ((guint32)INT_MAX + 1) / 1000;
3095 cnd_new(CND_CLASS_CAPTURESIZE, (guint64)capture_opts->autostop_filesize * 1000);
3097 if (capture_opts->has_autostop_duration)
3098 cnd_autostop_duration =
3099 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3101 if (capture_opts->multi_files_on) {
3102 if (capture_opts->has_file_duration)
3104 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3106 if (capture_opts->has_autostop_files)
3107 cnd_autostop_files =
3108 cnd_new(CND_CLASS_CAPTURESIZE, (guint64)capture_opts->autostop_files);
3111 /* init the time values */
3113 upd_time = GetTickCount();
3115 gettimeofday(&upd_time, NULL);
3117 start_time = create_timestamp();
3118 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running.");
3120 /* WOW, everything is prepared! */
3121 /* please fasten your seat belts, we will enter now the actual capture loop */
3123 pcap_queue = g_async_queue_new();
3124 pcap_queue_bytes = 0;
3125 pcap_queue_packets = 0;
3126 for (i = 0; i < global_ld.pcaps->len; i++) {
3127 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3128 #if GLIB_CHECK_VERSION(2,31,0)
3129 /* XXX - Add an interface name here? */
3130 pcap_opts->tid = g_thread_new("Capture read", pcap_read_handler, pcap_opts);
3132 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3136 while (global_ld.go) {
3137 /* dispatch incoming packets */
3139 pcap_queue_element *queue_element;
3140 #if GLIB_CHECK_VERSION(2,31,18)
3142 g_async_queue_lock(pcap_queue);
3143 queue_element = (pcap_queue_element *)g_async_queue_timeout_pop_unlocked(pcap_queue, WRITER_THREAD_TIMEOUT);
3145 GTimeVal write_thread_time;
3147 g_get_current_time(&write_thread_time);
3148 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3149 g_async_queue_lock(pcap_queue);
3150 queue_element = (pcap_queue_element *)g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3152 if (queue_element) {
3153 pcap_queue_bytes -= queue_element->phdr.caplen;
3154 pcap_queue_packets -= 1;
3156 g_async_queue_unlock(pcap_queue);
3157 if (queue_element) {
3158 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3159 "Dequeued a packet of length %d captured on interface %d.",
3160 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3162 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3163 &queue_element->phdr,
3165 g_free(queue_element->pd);
3166 g_free(queue_element);
3172 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3173 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3174 sizeof(errmsg), pcap_opts);
3177 /* Were we asked to print packet counts by the SIGINFO handler? */
3178 if (global_ld.report_packet_count) {
3179 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3180 plurality(global_ld.packet_count, "", "s"));
3181 global_ld.report_packet_count = FALSE;
3186 /* any news from our parent (signal pipe)? -> just stop the capture */
3187 if (!signal_pipe_check_running()) {
3188 global_ld.go = FALSE;
3193 global_ld.inpkts_to_sync_pipe += inpkts;
3195 /* check capture size condition */
3196 if (cnd_autostop_size != NULL &&
3197 cnd_eval(cnd_autostop_size, global_ld.bytes_written)) {
3198 /* Capture size limit reached, do we have another file? */
3199 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3200 cnd_autostop_size, cnd_file_duration))
3202 } /* cnd_autostop_size */
3203 if (capture_opts->output_to_pipe) {
3204 fflush(global_ld.pdh);
3208 /* Only update once every 500ms so as not to overload slow displays.
3209 * This also prevents too much context-switching between the dumpcap
3210 * and wireshark processes.
3212 #define DUMPCAP_UPD_TIME 500
3215 cur_time = GetTickCount(); /* Note: wraps to 0 if sys runs for 49.7 days */
3216 if ((cur_time - upd_time) > DUMPCAP_UPD_TIME) { /* wrap just causes an extra update */
3218 gettimeofday(&cur_time, NULL);
3219 if (((guint64)cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3220 ((guint64)upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3223 upd_time = cur_time;
3226 if (pcap_stats(pch, stats) >= 0) {
3227 *stats_known = TRUE;
3230 /* Let the parent process know. */
3231 if (global_ld.inpkts_to_sync_pipe) {
3233 fflush(global_ld.pdh);
3235 /* Send our parent a message saying we've written out
3236 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3238 report_packet_count(global_ld.inpkts_to_sync_pipe);
3240 global_ld.inpkts_to_sync_pipe = 0;
3243 /* check capture duration condition */
3244 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3245 /* The maximum capture time has elapsed; stop the capture. */
3246 global_ld.go = FALSE;
3250 /* check capture file duration condition */
3251 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3252 /* duration limit reached, do we have another file? */
3253 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3254 cnd_autostop_size, cnd_file_duration))
3256 } /* cnd_file_duration */
3260 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3262 pcap_queue_element *queue_element;
3264 for (i = 0; i < global_ld.pcaps->len; i++) {
3265 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3266 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3267 pcap_opts->interface_id);
3268 g_thread_join(pcap_opts->tid);
3269 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3270 pcap_opts->interface_id);
3273 g_async_queue_lock(pcap_queue);
3274 queue_element = (pcap_queue_element *)g_async_queue_try_pop_unlocked(pcap_queue);
3275 if (queue_element) {
3276 pcap_queue_bytes -= queue_element->phdr.caplen;
3277 pcap_queue_packets -= 1;
3279 g_async_queue_unlock(pcap_queue);
3280 if (queue_element == NULL) {
3283 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3284 "Dequeued a packet of length %d captured on interface %d.",
3285 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3286 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3287 &queue_element->phdr,
3289 g_free(queue_element->pd);
3290 g_free(queue_element);
3291 global_ld.inpkts_to_sync_pipe += 1;
3292 if (capture_opts->output_to_pipe) {
3293 fflush(global_ld.pdh);
3299 /* delete stop conditions */
3300 if (cnd_file_duration != NULL)
3301 cnd_delete(cnd_file_duration);
3302 if (cnd_autostop_files != NULL)
3303 cnd_delete(cnd_autostop_files);
3304 if (cnd_autostop_size != NULL)
3305 cnd_delete(cnd_autostop_size);
3306 if (cnd_autostop_duration != NULL)
3307 cnd_delete(cnd_autostop_duration);
3309 /* did we have a pcap (input) error? */
3310 for (i = 0; i < capture_opts->ifaces->len; i++) {
3311 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3312 if (pcap_opts->pcap_err) {
3313 /* On Linux, if an interface goes down while you're capturing on it,
3314 you'll get a "recvfrom: Network is down" or
3315 "The interface went down" error (ENETDOWN).
3316 (At least you will if g_strerror() doesn't show a local translation
3319 On FreeBSD and OS X, if a network adapter disappears while
3320 you're capturing on it, you'll get a "read: Device not configured"
3321 error (ENXIO). (See previous parenthetical note.)
3323 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3325 These should *not* be reported to the Wireshark developers. */
3328 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3329 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3330 strcmp(cap_err_str, "The interface went down") == 0 ||
3331 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3332 strcmp(cap_err_str, "read: I/O error") == 0 ||
3333 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3334 report_capture_error("The network adapter on which the capture was being done "
3335 "is no longer running; the capture has stopped.",
3338 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3340 report_capture_error(errmsg, please_report);
3343 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3344 report_capture_error(errmsg, "");
3348 /* did we have an output error while capturing? */
3349 if (global_ld.err == 0) {
3352 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3353 global_ld.err, FALSE);
3354 report_capture_error(errmsg, please_report);
3358 if (capture_opts->saving_to_file) {
3359 /* close the output file */
3360 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3364 /* there might be packets not yet notified to the parent */
3365 /* (do this after closing the file, so all packets are already flushed) */
3366 if (global_ld.inpkts_to_sync_pipe) {
3368 report_packet_count(global_ld.inpkts_to_sync_pipe);
3369 global_ld.inpkts_to_sync_pipe = 0;
3372 /* If we've displayed a message about a write error, there's no point
3373 in displaying another message about an error on close. */
3374 if (!close_ok && write_ok) {
3375 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3377 report_capture_error(errmsg, "");
3381 * XXX We exhibit different behaviour between normal mode and sync mode
3382 * when the pipe is stdin and not already at EOF. If we're a child, the
3383 * parent's stdin isn't closed, so if the user starts another capture,
3384 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3385 * will say "Unrecognized libpcap format". On the other hand, in normal
3386 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3389 report_capture_count(TRUE);
3391 /* get packet drop statistics from pcap */
3392 for (i = 0; i < capture_opts->ifaces->len; i++) {
3394 guint32 pcap_dropped = 0;
3396 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3397 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3398 received = pcap_opts->received;
3399 if (pcap_opts->pcap_h != NULL) {
3400 g_assert(!pcap_opts->from_cap_pipe);
3401 /* Get the capture statistics, so we know how many packets were dropped. */
3403 * Older versions of libpcap didn't set ps_ifdrop on some
3404 * platforms; initialize it to 0 to handle that.
3406 stats->ps_ifdrop = 0;
3407 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3408 *stats_known = TRUE;
3409 /* Let the parent process know. */
3410 pcap_dropped += stats->ps_drop;
3412 g_snprintf(errmsg, sizeof(errmsg),
3413 "Can't get packet-drop statistics: %s",
3414 pcap_geterr(pcap_opts->pcap_h));
3415 report_capture_error(errmsg, please_report);
3418 report_packet_drops(received, pcap_dropped, pcap_opts->dropped, pcap_opts->flushed, stats->ps_ifdrop, interface_opts.console_display_name);
3421 /* close the input file (pcap or capture pipe) */
3422 capture_loop_close_input(&global_ld);
3424 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped.");
3426 /* ok, if the write and the close were successful. */
3427 return write_ok && close_ok;
3430 if (capture_opts->multi_files_on) {
3431 /* cleanup ringbuffer */
3432 ringbuf_error_cleanup();
3434 /* We can't use the save file, and we have no FILE * for the stream
3435 to close in order to close it, so close the FD directly. */
3436 if (global_ld.save_file_fd != -1) {
3437 ws_close(global_ld.save_file_fd);
3440 /* We couldn't even start the capture, so get rid of the capture
3442 if (capture_opts->save_file != NULL) {
3443 ws_unlink(capture_opts->save_file);
3444 g_free(capture_opts->save_file);
3447 capture_opts->save_file = NULL;
3449 report_cfilter_error(capture_opts, error_index, errmsg);
3451 report_capture_error(errmsg, secondary_errmsg);
3453 /* close the input file (pcap or cap_pipe) */
3454 capture_loop_close_input(&global_ld);
3456 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3463 capture_loop_stop(void)
3465 #ifdef HAVE_PCAP_BREAKLOOP
3467 pcap_options *pcap_opts;
3469 for (i = 0; i < global_ld.pcaps->len; i++) {
3470 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3471 if (pcap_opts->pcap_h != NULL)
3472 pcap_breakloop(pcap_opts->pcap_h);
3475 global_ld.go = FALSE;
3480 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3481 int err, gboolean is_close)
3486 g_snprintf(errmsg, errmsglen,
3487 "Not all the packets could be written to the file"
3488 " to which the capture was being saved\n"
3489 "(\"%s\") because there is no space left on the file system\n"
3490 "on which that file resides.",
3496 g_snprintf(errmsg, errmsglen,
3497 "Not all the packets could be written to the file"
3498 " to which the capture was being saved\n"
3499 "(\"%s\") because you are too close to, or over,"
3500 " your disk quota\n"
3501 "on the file system on which that file resides.",
3508 g_snprintf(errmsg, errmsglen,
3509 "The file to which the capture was being saved\n"
3510 "(\"%s\") could not be closed: %s.",
3511 fname, g_strerror(err));
3513 g_snprintf(errmsg, errmsglen,
3514 "An error occurred while writing to the file"
3515 " to which the capture was being saved\n"
3517 fname, g_strerror(err));
3524 /* one packet was captured, process it */
3526 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3529 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3531 guint ts_mul = pcap_opts->ts_nsec ? 1000000000 : 1000000;
3533 /* We may be called multiple times from pcap_dispatch(); if we've set
3534 the "stop capturing" flag, ignore this packet, as we're not
3535 supposed to be saving any more packets. */
3536 if (!global_ld.go) {
3537 pcap_opts->flushed++;
3541 if (global_ld.pdh) {
3542 gboolean successful;
3544 /* We're supposed to write the packet to a file; do so.
3545 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3546 "ld->err" to the error. */
3547 if (global_capture_opts.use_pcapng) {
3548 successful = pcapng_write_enhanced_packet_block(global_ld.pdh,
3550 phdr->ts.tv_sec, (gint32)phdr->ts.tv_usec,
3551 phdr->caplen, phdr->len,
3552 pcap_opts->interface_id,
3555 &global_ld.bytes_written, &err);
3557 successful = libpcap_write_packet(global_ld.pdh,
3558 phdr->ts.tv_sec, (gint32)phdr->ts.tv_usec,
3559 phdr->caplen, phdr->len,
3561 &global_ld.bytes_written, &err);
3564 global_ld.go = FALSE;
3565 global_ld.err = err;
3566 pcap_opts->dropped++;
3568 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
3569 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3570 "Wrote a packet of length %d captured on interface %u.",
3571 phdr->caplen, pcap_opts->interface_id);
3573 global_ld.packet_count++;
3574 pcap_opts->received++;
3575 /* if the user told us to stop after x packets, do we already have enough? */
3576 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3577 global_ld.go = FALSE;
3583 /* one packet was captured, queue it */
3585 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3588 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3589 pcap_queue_element *queue_element;
3590 gboolean limit_reached;
3592 /* We may be called multiple times from pcap_dispatch(); if we've set
3593 the "stop capturing" flag, ignore this packet, as we're not
3594 supposed to be saving any more packets. */
3595 if (!global_ld.go) {
3596 pcap_opts->flushed++;
3600 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3601 if (queue_element == NULL) {
3602 pcap_opts->dropped++;
3605 queue_element->pcap_opts = pcap_opts;
3606 queue_element->phdr = *phdr;
3607 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3608 if (queue_element->pd == NULL) {
3609 pcap_opts->dropped++;
3610 g_free(queue_element);
3613 memcpy(queue_element->pd, pd, phdr->caplen);
3614 g_async_queue_lock(pcap_queue);
3615 if (((pcap_queue_byte_limit == 0) || (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3616 ((pcap_queue_packet_limit == 0) || (pcap_queue_packets < pcap_queue_packet_limit))) {
3617 limit_reached = FALSE;
3618 g_async_queue_push_unlocked(pcap_queue, queue_element);
3619 pcap_queue_bytes += phdr->caplen;
3620 pcap_queue_packets += 1;
3622 limit_reached = TRUE;
3624 g_async_queue_unlock(pcap_queue);
3625 if (limit_reached) {
3626 pcap_opts->dropped++;
3627 g_free(queue_element->pd);
3628 g_free(queue_element);
3629 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3630 "Dropped a packet of length %d captured on interface %u.",
3631 phdr->caplen, pcap_opts->interface_id);
3633 pcap_opts->received++;
3634 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3635 "Queued a packet of length %d captured on interface %u.",
3636 phdr->caplen, pcap_opts->interface_id);
3638 /* I don't want to hold the mutex over the debug output. So the
3639 output may be wrong */
3640 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3641 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3642 pcap_queue_bytes, pcap_queue_packets);
3646 set_80211_channel(const char *iface, const char *opt)
3650 int center_freq1 = -1;
3651 int center_freq2 = -1;
3654 gchar **options = NULL;
3656 options = g_strsplit_set(opt, ",", 4);
3657 for (args = 0; options[args]; args++);
3660 freq = atoi(options[0]);
3662 if (args >= 1 && options[1]) {
3663 type = ws80211_str_to_chan_type(options[1]);
3670 if (args >= 2 && options[2])
3671 center_freq1 = atoi(options[2]);
3673 if (args >= 3 && options[3])
3674 center_freq2 = atoi(options[3]);
3676 ret = ws80211_init();
3678 cmdarg_err("%d: Failed to init ws80211: %s\n", abs(ret), g_strerror(abs(ret)));
3682 ret = ws80211_set_freq(iface, freq, type, center_freq1, center_freq2);
3685 cmdarg_err("%d: Failed to set channel: %s\n", abs(ret), g_strerror(abs(ret)));
3691 pipe_write_block(2, SP_SUCCESS, NULL);
3695 g_strfreev(options);
3700 get_dumpcap_compiled_info(GString *str)
3702 /* Capture libraries */
3703 g_string_append(str, ", ");
3704 get_compiled_caplibs_version(str);
3708 get_dumpcap_runtime_info(GString *str)
3710 /* Capture libraries */
3711 g_string_append(str, ", ");
3712 get_runtime_caplibs_version(str);
3715 /* And now our feature presentation... [ fade to music ] */
3717 main(int argc, char *argv[])
3719 GString *comp_info_str;
3720 GString *runtime_info_str;
3722 static const struct option long_options[] = {
3723 {"help", no_argument, NULL, 'h'},
3724 {"version", no_argument, NULL, 'v'},
3725 LONGOPT_CAPTURE_COMMON
3729 gboolean arg_error = FALSE;
3734 struct sigaction action, oldaction;
3737 gboolean start_capture = TRUE;
3738 gboolean stats_known;
3739 struct pcap_stat stats;
3740 GLogLevelFlags log_flags;
3741 gboolean list_interfaces = FALSE;
3742 gboolean list_link_layer_types = FALSE;
3743 #ifdef HAVE_BPF_IMAGE
3744 gboolean print_bpf_code = FALSE;
3746 gboolean set_chan = FALSE;
3747 gchar *set_chan_arg = NULL;
3748 gboolean machine_readable = FALSE;
3749 gboolean print_statistics = FALSE;
3750 int status, run_once_args = 0;
3753 #if defined(__APPLE__) && defined(__LP64__)
3754 struct utsname osinfo;
3758 cmdarg_err_init(dumpcap_cmdarg_err, dumpcap_cmdarg_err_cont);
3760 /* Get the compile-time version information string */
3761 comp_info_str = get_compiled_version_info(NULL, get_dumpcap_compiled_info);
3763 /* Get the run-time version information string */
3764 runtime_info_str = get_runtime_version_info(get_dumpcap_runtime_info);
3766 /* Add it to the information to be reported on a crash. */
3767 ws_add_crash_info("Dumpcap (Wireshark) %s\n"
3772 get_ws_vcs_version_info(), comp_info_str->str, runtime_info_str->str);
3775 arg_list_utf_16to8(argc, argv);
3776 create_app_running_mutex();
3779 * Initialize our DLL search path. MUST be called before LoadLibrary
3782 ws_init_dll_search_path();
3785 #ifdef HAVE_BPF_IMAGE
3786 #define OPTSTRING_d "d"
3788 #define OPTSTRING_d ""
3791 #ifdef HAVE_PCAP_REMOTE
3792 #define OPTSTRING_r "r"
3793 #define OPTSTRING_u "u"
3795 #define OPTSTRING_r ""
3796 #define OPTSTRING_u ""
3799 #ifdef HAVE_PCAP_SETSAMPLING
3800 #define OPTSTRING_m "m:"
3802 #define OPTSTRING_m ""
3805 #define OPTSTRING OPTSTRING_CAPTURE_COMMON "C:" OPTSTRING_d "gh" "k:" OPTSTRING_m "MN:nPq" OPTSTRING_r "St" OPTSTRING_u "vw:Z:"
3807 #ifdef DEBUG_CHILD_DUMPCAP
3808 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3809 fprintf (stderr, "Unable to open debug log file .\n");
3814 #if defined(__APPLE__) && defined(__LP64__)
3816 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3817 * a bug workaround - timeouts less than 1 second don't work with libpcap
3818 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3819 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3820 * The problem is extremely unlikely to be reintroduced in a future
3823 if (uname(&osinfo) == 0) {
3825 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3826 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3827 * number of 10.0.0, not 10.1.0 - go figure).
3829 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3830 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3831 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3832 need_timeout_workaround = TRUE;
3837 * Determine if dumpcap is being requested to run in a special
3838 * capture_child mode by going thru the command line args to see if
3839 * a -Z is present. (-Z is a hidden option).
3841 * The primary result of running in capture_child mode is that
3842 * all messages sent out on stderr are in a special type/len/string
3843 * format to allow message processing by type. These messages include
3844 * error messages if dumpcap fails to start the operation it was
3845 * requested to do, as well as various "status" messages which are sent
3846 * when an actual capture is in progress, and a "success" message sent
3847 * if dumpcap was requested to perform an operation other than a
3850 * Capture_child mode would normally be requested by a parent process
3851 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3852 * to which dumpcap stderr has been redirected. It might also have
3853 * another pipe to obtain dumpcap stdout output; for operations other
3854 * than a capture, that information is formatted specially for easier
3855 * parsing by the parent process.
3857 * Capture_child mode needs to be determined immediately upon
3858 * startup so that any messages generated by dumpcap in this mode
3859 * (eg: during initialization) will be formatted properly.
3862 for (i=1; i<argc; i++) {
3863 if (strcmp("-Z", argv[i]) == 0) {
3864 capture_child = TRUE;
3865 machine_readable = TRUE; /* request machine-readable output */
3867 /* set output pipe to binary mode, to avoid ugly text conversions */
3868 _setmode(2, O_BINARY);
3873 /* The default_log_handler will use stdout, which makes trouble in */
3874 /* capture child mode, as it uses stdout for its sync_pipe. */
3875 /* So: the filtering is done in the console_log_handler and not here.*/
3876 /* We set the log handlers right up front to make sure that any log */
3877 /* messages when running as child will be sent back to the parent */
3878 /* with the correct format. */
3883 G_LOG_LEVEL_CRITICAL|
3884 G_LOG_LEVEL_WARNING|
3885 G_LOG_LEVEL_MESSAGE|
3889 G_LOG_FLAG_RECURSION);
3891 g_log_set_handler(NULL,
3893 console_log_handler, NULL /* user_data */);
3894 g_log_set_handler(LOG_DOMAIN_MAIN,
3896 console_log_handler, NULL /* user_data */);
3897 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3899 console_log_handler, NULL /* user_data */);
3900 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3902 console_log_handler, NULL /* user_data */);
3904 /* Initialize the pcaps list */
3905 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
3907 #if !GLIB_CHECK_VERSION(2,31,0)
3908 /* Initialize the thread system */
3909 g_thread_init(NULL);
3913 /* Load wpcap if possible. Do this before collecting the run-time version information */
3916 /* ... and also load the packet.dll from wpcap */
3917 /* XXX - currently not required, may change later. */
3918 /*wpcap_packet_load();*/
3920 /* Start windows sockets */
3921 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3923 /* Set handler for Ctrl+C key */
3924 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3926 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3927 and exit. Do the same with SIGPIPE, in case, for example,
3928 we're writing to our standard output and it's a pipe.
3929 Do the same with SIGHUP if it's not being ignored (if we're
3930 being run under nohup, it might be ignored, in which case we
3931 should leave it ignored).
3933 XXX - apparently, Coverity complained that part of action
3934 wasn't initialized. Perhaps it's running on Linux, where
3935 struct sigaction has an ignored "sa_restorer" element and
3936 where "sa_handler" and "sa_sigaction" might not be two
3937 members of a union. */
3938 memset(&action, 0, sizeof(action));
3939 action.sa_handler = capture_cleanup_handler;
3941 * Arrange that system calls not get restarted, because when
3942 * our signal handler returns we don't want to restart
3943 * a call that was waiting for packets to arrive.
3945 action.sa_flags = 0;
3946 sigemptyset(&action.sa_mask);
3947 sigaction(SIGTERM, &action, NULL);
3948 sigaction(SIGINT, &action, NULL);
3949 sigaction(SIGPIPE, &action, NULL);
3950 sigaction(SIGHUP, NULL, &oldaction);
3951 if (oldaction.sa_handler == SIG_DFL)
3952 sigaction(SIGHUP, &action, NULL);
3955 /* Catch SIGINFO and, if we get it and we're capturing in
3956 quiet mode, report the number of packets we've captured. */
3957 action.sa_handler = report_counts_siginfo;
3958 action.sa_flags = SA_RESTART;
3959 sigemptyset(&action.sa_mask);
3960 sigaction(SIGINFO, &action, NULL);
3961 #endif /* SIGINFO */
3965 enable_kernel_bpf_jit_compiler();
3968 /* ----------------------------------------------------------------- */
3969 /* Privilege and capability handling */
3971 /* 1. Running not as root or suid root; no special capabilities. */
3974 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3977 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3979 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3980 /* capabilities; Drop all other capabilities; */
3981 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3982 /* else: after pcap_open_live() in capture_loop_open_input() */
3983 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3984 /* (Note: this means that the process, although logged in */
3985 /* as root, does not have various permissions such as the */
3986 /* ability to bypass file access permissions). */
3987 /* XXX: Should we just leave capabilities alone in this case */
3988 /* so that user gets expected effect that root can do */
3991 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3993 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3994 /* else: after pcap_open_live() in capture_loop_open_input() */
3995 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3996 /* pcap_open_live). */
3998 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
4000 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4001 /* capabilities; Drop all other capabilities; */
4002 /* Drop suid privileges (euid=ruid); */
4003 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4004 /* else: after pcap_open_live() in capture_loop_open_input() */
4005 /* drop all capabilities (NET_RAW and NET_ADMIN). */
4007 /* XXX: For some Linux versions/distros with capabilities */
4008 /* a 'normal' process with any capabilities cannot be */
4009 /* 'killed' (signaled) from another (same uid) non-privileged */
4011 /* For example: If (non-suid) Wireshark forks a */
4012 /* child suid dumpcap which acts as described here (case 5), */
4013 /* Wireshark will be unable to kill (signal) the child */
4014 /* dumpcap process until the capabilities have been dropped */
4015 /* (after pcap_open_live()). */
4016 /* This behaviour will apparently be changed in the kernel */
4017 /* to allow the kill (signal) in this case. */
4018 /* See the following for details: */
4019 /* https://www.mail-archive.com/ [wrapped] */
4020 /* linux-security-module@vger.kernel.org/msg02913.html */
4022 /* It is therefore conceivable that if dumpcap somehow hangs */
4023 /* in pcap_open_live or before that wireshark will not */
4024 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
4025 /* In this case, exiting wireshark will kill the child */
4026 /* dumpcap process. */
4028 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
4029 /* capabilities; Using libcap. Note: capset cmd (which see) */
4030 /* used to assign capabilities to file. */
4032 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4033 /* else: after pcap_open_live() in capture_loop_open_input() */
4034 /* drop all capabilities (NET_RAW and NET_ADMIN) */
4036 /* ToDo: -S (stats) should drop privileges/capabilities when no */
4037 /* longer required (similar to capture). */
4039 /* ----------------------------------------------------------------- */
4041 init_process_policies();
4044 /* If 'started with special privileges' (and using libcap) */
4045 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
4046 /* Set euid/egid = ruid/rgid to remove suid privileges */
4047 relinquish_privs_except_capture();
4050 /* Set the initial values in the capture options. This might be overwritten
4051 by the command line parameters. */
4052 capture_opts_init(&global_capture_opts);
4053 /* We always save to a file - if no file was specified, we save to a
4055 global_capture_opts.saving_to_file = TRUE;
4056 global_capture_opts.has_ring_num_files = TRUE;
4058 /* Pass on capture_child mode for capture_opts */
4059 global_capture_opts.capture_child = capture_child;
4061 /* Now get our args */
4062 while ((opt = getopt_long(argc, argv, OPTSTRING, long_options, NULL)) != -1) {
4064 case 'h': /* Print help and exit */
4065 printf("Dumpcap (Wireshark) %s\n"
4066 "Capture network packets and dump them into a pcapng or pcap file.\n"
4067 "See https://www.wireshark.org for more information.\n",
4068 get_ws_vcs_version_info());
4069 print_usage(stdout);
4072 case 'v': /* Show version and exit */
4074 show_version("Dumpcap (Wireshark)", comp_info_str, runtime_info_str);
4075 g_string_free(comp_info_str, TRUE);
4076 g_string_free(runtime_info_str, TRUE);
4080 /*** capture option specific ***/
4081 case 'a': /* autostop criteria */
4082 case 'b': /* Ringbuffer option */
4083 case 'c': /* Capture x packets */
4084 case 'f': /* capture filter */
4085 case 'g': /* enable group read access on file(s) */
4086 case 'i': /* Use interface x */
4087 case 'n': /* Use pcapng format */
4088 case 'p': /* Don't capture in promiscuous mode */
4089 case 'P': /* Use pcap format */
4090 case 's': /* Set the snapshot (capture) length */
4091 case 'w': /* Write to capture file x */
4092 case 'y': /* Set the pcap data link type */
4093 case LONGOPT_NUM_CAP_COMMENT: /* add a capture comment */
4094 #ifdef HAVE_PCAP_REMOTE
4095 case 'u': /* Use UDP for data transfer */
4096 case 'r': /* Capture own RPCAP traffic too */
4097 case 'A': /* Authentication */
4099 #ifdef HAVE_PCAP_SETSAMPLING
4100 case 'm': /* Sampling */
4102 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
4103 case 'B': /* Buffer size */
4105 #ifdef HAVE_PCAP_CREATE
4106 case 'I': /* Monitor mode */
4108 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4113 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4115 capture_child = TRUE;
4117 /* set output pipe to binary mode, to avoid ugly text conversions */
4118 _setmode(2, O_BINARY);
4120 * optarg = the control ID, aka the PPID, currently used for the
4123 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4124 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4125 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4126 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4128 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4129 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4130 "Signal pipe: Unable to open %s. Dead parent?",
4138 case 'q': /* Quiet */
4144 /*** all non capture option specific ***/
4145 case 'D': /* Print a list of capture devices and exit */
4146 if (!list_interfaces) {
4147 list_interfaces = TRUE;
4151 case 'L': /* Print list of link-layer types and exit */
4152 if (!list_link_layer_types) {
4153 list_link_layer_types = TRUE;
4157 #ifdef HAVE_BPF_IMAGE
4158 case 'd': /* Print BPF code for capture filter and exit */
4159 if (!print_bpf_code) {
4160 print_bpf_code = TRUE;
4165 case 'S': /* Print interface statistics once a second */
4166 if (!print_statistics) {
4167 print_statistics = TRUE;
4171 case 'k': /* Set wireless channel */
4174 set_chan_arg = optarg;
4177 cmdarg_err("Only one -k flag may be specified");
4181 case 'M': /* For -D, -L, and -S, print machine-readable output */
4182 machine_readable = TRUE;
4185 pcap_queue_byte_limit = get_positive_int(optarg, "byte_limit");
4188 pcap_queue_packet_limit = get_positive_int(optarg, "packet_limit");
4191 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4193 case '?': /* Bad flag - print usage message */
4202 /* user specified file name as regular command-line argument */
4203 /* XXX - use it as the capture file name (or something else)? */
4209 * Extra command line arguments were specified; complain.
4210 * XXX - interpret as capture filter, as tcpdump and tshark do?
4212 cmdarg_err("Invalid argument: %s", argv[0]);
4217 if ((pcap_queue_byte_limit > 0) || (pcap_queue_packet_limit > 0)) {
4220 if ((pcap_queue_byte_limit == 0) && (pcap_queue_packet_limit == 0)) {
4221 /* Use some default if the user hasn't specified some */
4222 /* XXX: Are these defaults good enough? */
4223 pcap_queue_byte_limit = 1000 * 1000;
4224 pcap_queue_packet_limit = 1000;
4227 print_usage(stderr);
4231 if (run_once_args > 1) {
4232 #ifdef HAVE_BPF_IMAGE
4233 cmdarg_err("Only one of -D, -L, -d, -k, or -S may be supplied.");
4235 cmdarg_err("Only one of -D, -L, -k, or -S may be supplied.");
4238 } else if (run_once_args == 1) {
4239 /* We're supposed to print some information, rather than
4240 to capture traffic; did they specify a ring buffer option? */
4241 if (global_capture_opts.multi_files_on) {
4242 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4246 /* We're supposed to capture traffic; */
4248 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4249 if (global_capture_opts.ifaces->len > 1) {
4251 global_capture_opts.use_pcapng = TRUE;
4254 if (global_capture_opts.capture_comment &&
4255 (!global_capture_opts.use_pcapng || global_capture_opts.multi_files_on)) {
4256 /* XXX - for ringbuffer, should we apply the comment to each file? */
4257 cmdarg_err("A capture comment can only be set if we capture into a single pcapng file.");
4261 /* Was the ring buffer option specified and, if so, does it make sense? */
4262 if (global_capture_opts.multi_files_on) {
4263 /* Ring buffer works only under certain conditions:
4264 a) ring buffer does not work with temporary files;
4265 b) it makes no sense to enable the ring buffer if the maximum
4266 file size is set to "infinite". */
4267 if (global_capture_opts.save_file == NULL) {
4268 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4269 global_capture_opts.multi_files_on = FALSE;
4271 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4272 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4274 /* XXX - this must be redesigned as the conditions changed */
4275 global_capture_opts.multi_files_on = FALSE;
4282 * "-D" requires no interface to be selected; it's supposed to list
4285 if (list_interfaces) {
4286 /* Get the list of interfaces */
4291 if_list = capture_interface_list(&err, &err_str,NULL);
4292 if (if_list == NULL) {
4295 * If we're being run by another program, just give them
4296 * an empty list of interfaces, don't report this as
4297 * an error; that lets them decide whether to report
4298 * this as an error or not.
4300 if (!machine_readable) {
4301 cmdarg_err("There are no interfaces on which a capture can be done");
4305 cmdarg_err("%s", err_str);
4311 if (machine_readable) /* tab-separated values to stdout */
4312 print_machine_readable_interfaces(if_list);
4314 capture_opts_print_interfaces(if_list);
4315 free_interface_list(if_list);
4320 * "-S" requires no interface to be selected; it gives statistics
4321 * for all interfaces.
4323 if (print_statistics) {
4324 status = print_statistics_loop(machine_readable);
4329 interface_options interface_opts;
4331 if (global_capture_opts.ifaces->len != 1) {
4332 cmdarg_err("Need one interface");
4336 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, 0);
4337 status = set_80211_channel(interface_opts.name, set_chan_arg);
4342 * "-L", "-d", and capturing act on a particular interface, so we have to
4343 * have an interface; if none was specified, pick a default.
4345 status = capture_opts_default_iface_if_necessary(&global_capture_opts, NULL);
4347 /* cmdarg_err() already called .... */
4351 if (list_link_layer_types) {
4352 /* Get the list of link-layer types for the capture device. */
4353 if_capabilities_t *caps;
4357 for (ii = 0; ii < global_capture_opts.ifaces->len; ii++) {
4358 interface_options interface_opts;
4360 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, ii);
4362 caps = get_if_capabilities(&interface_opts, &err_str);
4364 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4365 "Please check to make sure you have sufficient permissions, and that\n"
4366 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4370 if (caps->data_link_types == NULL) {
4371 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4374 if (machine_readable) /* tab-separated values to stdout */
4375 /* XXX: We need to change the format and adopt consumers */
4376 print_machine_readable_if_capabilities(caps);
4378 /* XXX: We might want to print also the interface name */
4379 capture_opts_print_if_capabilities(caps, interface_opts.name,
4380 interface_opts.monitor_mode);
4381 free_if_capabilities(caps);
4386 /* We're supposed to do a capture, or print the BPF code for a filter. */
4388 /* Let the user know what interfaces were chosen. */
4389 if (capture_child) {
4390 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4391 interface_options interface_opts;
4393 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4394 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n",
4395 interface_opts.name);
4398 str = g_string_new("");
4400 if (global_capture_opts.ifaces->len < 2)
4402 if (global_capture_opts.ifaces->len < 4)
4405 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4406 interface_options interface_opts;
4408 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4410 if (global_capture_opts.ifaces->len > 2) {
4411 g_string_append_printf(str, ",");
4413 g_string_append_printf(str, " ");
4414 if (j == global_capture_opts.ifaces->len - 1) {
4415 g_string_append_printf(str, "and ");
4418 g_string_append_printf(str, "'%s'", interface_opts.console_display_name);
4421 g_string_append_printf(str, "%u interfaces", global_capture_opts.ifaces->len);
4423 fprintf(stderr, "Capturing on %s\n", str->str);
4424 g_string_free(str, TRUE);
4427 /* Process the snapshot length, as that affects the generated BPF code. */
4428 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4430 #ifdef HAVE_BPF_IMAGE
4431 if (print_bpf_code) {
4432 show_filter_code(&global_capture_opts);
4437 /* We're supposed to do a capture. Process the ring buffer arguments. */
4438 capture_opts_trim_ring_num_files(&global_capture_opts);
4440 /* flush stderr prior to starting the main capture loop */
4443 /* Now start the capture. */
4444 if (capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4448 /* capture failed */
4451 return 0; /* never here, make compiler happy */
4456 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4457 const char *message, gpointer user_data _U_)
4464 /* ignore log message, if log_level isn't interesting */
4465 if ( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4466 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4471 /* create a "timestamp" */
4473 today = localtime(&curr);
4475 switch(log_level & G_LOG_LEVEL_MASK) {
4476 case G_LOG_LEVEL_ERROR:
4479 case G_LOG_LEVEL_CRITICAL:
4482 case G_LOG_LEVEL_WARNING:
4485 case G_LOG_LEVEL_MESSAGE:
4488 case G_LOG_LEVEL_INFO:
4491 case G_LOG_LEVEL_DEBUG:
4495 fprintf(stderr, "unknown log_level %d\n", log_level);
4497 g_assert_not_reached();
4500 /* Generate the output message */
4501 if (log_level & G_LOG_LEVEL_MESSAGE) {
4502 /* normal user messages without additional infos */
4503 msg = g_strdup_printf("%s\n", message);
4505 /* info/debug messages with additional infos */
4506 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4507 today->tm_hour, today->tm_min, today->tm_sec,
4508 log_domain != NULL ? log_domain : "",
4512 /* DEBUG & INFO msgs (if we're debugging today) */
4513 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4514 if ( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4515 #ifdef DEBUG_DUMPCAP
4516 fprintf(stderr, "%s", msg);
4519 #ifdef DEBUG_CHILD_DUMPCAP
4520 fprintf(debug_log, "%s", msg);
4528 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4529 /* to parent especially formatted if dumpcap running as child. */
4530 if (capture_child) {
4531 sync_pipe_errmsg_to_parent(2, msg, "");
4533 fprintf(stderr, "%s", msg);
4540 /****************************************************************************************************************/
4541 /* indication report routines */
4545 report_packet_count(unsigned int packet_count)
4547 char tmp[SP_DECISIZE+1+1];
4548 static unsigned int count = 0;
4550 if (capture_child) {
4551 g_snprintf(tmp, sizeof(tmp), "%u", packet_count);
4552 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4553 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4555 count += packet_count;
4556 fprintf(stderr, "\rPackets: %u ", count);
4557 /* stderr could be line buffered */
4563 report_new_capture_file(const char *filename)
4565 if (capture_child) {
4566 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4567 pipe_write_block(2, SP_FILE, filename);
4571 * Prevent a SIGINFO handler from writing to the standard error
4572 * while we're doing so; instead, have it just set a flag telling
4573 * us to print that information when we're done.
4576 #endif /* SIGINFO */
4577 fprintf(stderr, "File: %s\n", filename);
4578 /* stderr could be line buffered */
4583 * Allow SIGINFO handlers to write.
4588 * If a SIGINFO handler asked us to write out capture counts, do so.
4591 report_counts_for_siginfo();
4592 #endif /* SIGINFO */
4597 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4599 interface_options interface_opts;
4600 char tmp[MSG_MAX_LENGTH+1+6];
4602 if (i < capture_opts->ifaces->len) {
4603 if (capture_child) {
4604 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4605 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4606 pipe_write_block(2, SP_BAD_FILTER, tmp);
4609 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4610 * the error message below.
4612 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4614 "Invalid capture filter \"%s\" for interface '%s'.\n"
4616 "That string isn't a valid capture filter (%s).\n"
4617 "See the User's Guide for a description of the capture filter syntax.",
4618 interface_opts.cfilter, interface_opts.name, errmsg);
4624 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4626 if (capture_child) {
4627 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4628 "Primary Error: %s", error_msg);
4629 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4630 "Secondary Error: %s", secondary_error_msg);
4631 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4633 cmdarg_err("%s", error_msg);
4634 if (secondary_error_msg[0] != '\0')
4635 cmdarg_err_cont("%s", secondary_error_msg);
4640 report_packet_drops(guint32 received, guint32 pcap_drops, guint32 drops, guint32 flushed, guint32 ps_ifdrop, gchar *name)
4642 char tmp[SP_DECISIZE+1+1];
4643 guint32 total_drops = pcap_drops + drops + flushed;
4645 g_snprintf(tmp, sizeof(tmp), "%u", total_drops);
4647 if (capture_child) {
4648 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4649 "Packets received/dropped on interface '%s': %u/%u (pcap:%u/dumpcap:%u/flushed:%u/ps_ifdrop:%u)",
4650 name, received, total_drops, pcap_drops, drops, flushed, ps_ifdrop);
4651 /* XXX: Need to provide interface id, changes to consumers required. */
4652 pipe_write_block(2, SP_DROPS, tmp);
4655 "Packets received/dropped on interface '%s': %u/%u (pcap:%u/dumpcap:%u/flushed:%u/ps_ifdrop:%u) (%.1f%%)\n",
4656 name, received, total_drops, pcap_drops, drops, flushed, ps_ifdrop,
4657 received ? 100.0 * received / (received + total_drops) : 0.0);
4658 /* stderr could be line buffered */
4664 /************************************************************************************************/
4665 /* signal_pipe handling */
4670 signal_pipe_check_running(void)
4672 /* any news from our parent? -> just stop the capture */
4676 /* if we are running standalone, no check required */
4677 if (!capture_child) {
4681 if (!sig_pipe_name || !sig_pipe_handle) {
4682 /* This shouldn't happen */
4683 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4684 "Signal pipe: No name or handle");
4689 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4690 * at this point. Should we check to see if the parent is still alive,
4691 * e.g. by using OpenProcess?
4694 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4696 if (!result || avail > 0) {
4697 /* peek failed or some bytes really available */
4698 /* (if not piping from stdin this would fail) */
4699 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4700 "Signal pipe: Stop capture: %s", sig_pipe_name);
4701 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4702 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4703 sig_pipe_handle, result, avail);
4706 /* pipe ok and no bytes available */
4713 * Editor modelines - https://www.wireshark.org/tools/modelines.html
4718 * indent-tabs-mode: nil
4721 * vi: set shiftwidth=4 tabstop=8 expandtab:
4722 * :indentSize=4:tabSize=8:noTabs=true: