5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 #include <stdlib.h> /* for exit() */
34 #ifdef HAVE_SYS_TYPES_H
35 # include <sys/types.h>
38 #ifdef HAVE_SYS_STAT_H
39 # include <sys/stat.h>
62 # include <sys/prctl.h>
63 # include <sys/capability.h>
67 #include "ringbuffer.h"
68 #include "clopts_common.h"
69 #include "cmdarg_err.h"
70 #include "version_info.h"
75 #include "capture-pcap-util.h"
78 #include "capture-wpcap.h"
82 #include <wsutil/unicode-utils.h>
85 #include <wsutil/privileges.h>
87 #include "sync_pipe.h"
89 #include "capture_opts.h"
90 #include "capture_sync.h"
92 #include "conditions.h"
93 #include "capture_stop_conditions.h"
97 #include "wsutil/file_util.h"
100 * Get information about libpcap format from "wiretap/libpcap.h".
101 * XXX - can we just use pcap_open_offline() to read the pipe?
103 #include "wiretap/libpcap.h"
105 /**#define DEBUG_DUMPCAP**/
106 /**#define DEBUG_CHILD_DUMPCAP**/
108 #ifdef DEBUG_CHILD_DUMPCAP
109 FILE *debug_log; /* for logging debug messages to */
110 /* a file if DEBUG_CHILD_DUMPCAP */
114 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
116 static gchar *sig_pipe_name = NULL;
117 static HANDLE sig_pipe_handle = NULL;
120 /** Stop a low-level capture (stops the capture child). */
121 static void capture_loop_stop(void);
123 #if !defined (__linux__)
124 #ifndef HAVE_PCAP_BREAKLOOP
126 * We don't have pcap_breakloop(), which is the only way to ensure that
127 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
128 * won't, if the call to read the next packet or batch of packets is
129 * is interrupted by a signal on UN*X, just go back and try again to
132 * On UN*X, we catch SIGUSR1 as a "stop capturing" signal, and, in
133 * the signal handler, set a flag to stop capturing; however, without
134 * a guarantee of that sort, we can't guarantee that we'll stop capturing
135 * if the read will be retried and won't time out if no packets arrive.
137 * Therefore, on at least some platforms, we work around the lack of
138 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
139 * to wait for packets to arrive, so that we're probably going to be
140 * blocked in the select() when the signal arrives, and can just bail
141 * out of the loop at that point.
143 * However, we don't want to that on BSD (because "select()" doesn't work
144 * correctly on BPF devices on at least some releases of some flavors of
145 * BSD), and we don't want to do it on Windows (because "select()" is
146 * something for sockets, not for arbitrary handles). (Note that "Windows"
147 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
148 * using WinPcap, not a UNIX libpcap.)
150 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
151 * on BSD times out even if no packets have arrived, so we'll eventually
152 * exit pcap_dispatch() with an indication that no packets have arrived,
153 * and will break out of the capture loop at that point.
155 * On Windows, we can't send a SIGUSR1 to stop capturing, so none of this
156 * applies in any case.
158 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
159 * want to include it if it's not present on this platform, however.
161 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
162 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
164 # define MUST_DO_SELECT
165 # endif /* avoid select */
166 #endif /* HAVE_PCAP_BREAKLOOP */
168 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
169 * in pcap_dispatch(); on the other hand, select() works just fine there.
170 * Hence we use a select for that come what may.
172 #define MUST_DO_SELECT
175 /** init the capture filter */
178 INITFILTER_BAD_FILTER,
179 INITFILTER_OTHER_ERROR
180 } initfilter_status_t;
182 typedef struct _loop_data {
184 gboolean go; /* TRUE as long as we're supposed to keep capturing */
185 int err; /* if non-zero, error seen while capturing */
186 gint packet_count; /* Number of packets we have already captured */
187 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
189 /* pcap "input file" */
190 pcap_t *pcap_h; /* pcap handle */
191 gboolean pcap_err; /* TRUE if error from pcap */
192 #ifdef MUST_DO_SELECT
193 int pcap_fd; /* pcap file descriptor */
196 /* capture pipe (unix only "input file") */
197 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
198 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
199 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
200 int cap_pipe_fd; /* the file descriptor of the capture pipe */
201 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
202 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
203 unsigned int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
204 unsigned int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
206 STATE_EXPECT_REC_HDR,
211 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
223 * Standard secondary message for unexpected errors.
225 static const char please_report[] =
226 "Please report this to the Wireshark developers.\n"
227 "(This is not a crash; please do not report it as such.)";
230 * This needs to be static, so that the SIGUSR1 handler can clear the "go"
233 static loop_data global_ld;
237 * Timeout, in milliseconds, for reads from the stream of captured packets.
239 #define CAP_READ_TIMEOUT 250
240 static char *cap_pipe_err_str;
243 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
244 const char *message, gpointer user_data _U_);
246 /* capture related options */
247 static capture_options global_capture_opts;
249 static void capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
251 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
252 int err, gboolean is_close);
256 static void exit_main(int err) __attribute__ ((noreturn));
258 static void exit_main(int err);
261 static void report_new_capture_file(const char *filename);
262 static void report_packet_count(int packet_count);
263 static void report_packet_drops(guint32 drops);
264 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
265 static void report_cfilter_error(const char *cfilter, const char *errmsg);
268 static gboolean signal_pipe_check_running(void);
272 print_usage(gboolean print_ver) {
280 "Dumpcap " VERSION "%s\n"
281 "Capture network packets and dump them into a libpcap file.\n"
282 "See http://www.wireshark.org for more information.\n",
283 wireshark_svnversion);
287 fprintf(output, "\nUsage: dumpcap [options] ...\n");
288 fprintf(output, "\n");
289 fprintf(output, "Capture interface:\n");
290 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
291 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
292 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
293 fprintf(output, " -p don't capture in promiscuous mode\n");
295 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
297 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
298 fprintf(output, " -D print list of interfaces and exit\n");
299 fprintf(output, " -L print list of link-layer types of iface and exit\n");
300 fprintf(output, " -S print statistics for each interface once every second\n");
301 fprintf(output, " -M for -D, -L, and -S produce machine-readable output\n");
302 fprintf(output, "\n");
303 #ifdef HAVE_PCAP_REMOTE
304 fprintf(output, "\nRPCAP options:\n");
305 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
306 fprintf(output, " -u use UDP for RPCAP data transfer\n");
307 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
308 #ifdef HAVE_PCAP_SETSAMPLING
309 fprintf(output, " -m <sampling type> use packet sampling\n");
310 fprintf(output, " count:NUM - capture one packet of every NUM\n");
311 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
314 fprintf(output, "Stop conditions:\n");
315 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
316 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
317 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
318 fprintf(output, " files:NUM - stop after NUM files\n");
319 /*fprintf(output, "\n");*/
320 fprintf(output, "Output (files):\n");
321 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
322 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
323 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
324 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
325 fprintf(output, " -n use pcapng format instead of pcap\n");
326 /*fprintf(output, "\n");*/
327 fprintf(output, "Miscellaneous:\n");
328 fprintf(output, " -v print version information and exit\n");
329 fprintf(output, " -h display this help and exit\n");
330 fprintf(output, "\n");
331 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
332 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
333 fprintf(output, "\n");
334 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
338 show_version(GString *comp_info_str, GString *runtime_info_str)
342 "Dumpcap " VERSION "%s\n"
347 "See http://www.wireshark.org for more information.\n",
348 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
352 * Report an error in command-line arguments.
355 cmdarg_err(const char *fmt, ...)
361 /* Generate a 'special format' message back to parent */
363 msg = g_strdup_vprintf(fmt, ap);
364 sync_pipe_errmsg_to_parent(2, msg, "");
369 fprintf(stderr, "dumpcap: ");
370 vfprintf(stderr, fmt, ap);
371 fprintf(stderr, "\n");
377 * Report additional information for an error in command-line arguments.
380 cmdarg_err_cont(const char *fmt, ...)
387 msg = g_strdup_vprintf(fmt, ap);
388 sync_pipe_errmsg_to_parent(2, msg, "");
393 vfprintf(stderr, fmt, ap);
394 fprintf(stderr, "\n");
404 /* Print the number of packets captured for each interface until we're killed. */
406 print_statistics_loop(gboolean machine_readable)
408 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
414 char errbuf[PCAP_ERRBUF_SIZE];
417 struct sigaction act;
420 if_list = get_interface_list(&err, &err_str);
421 if (if_list == NULL) {
423 case CANT_GET_INTERFACE_LIST:
424 cmdarg_err("%s", err_str);
428 case NO_INTERFACES_FOUND:
429 cmdarg_err("There are no interfaces on which a capture can be done");
435 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
436 if_info = if_entry->data;
437 #ifdef HAVE_PCAP_OPEN
438 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
440 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
444 if_stat = g_malloc(sizeof(if_stat_t));
445 if_stat->name = g_strdup(if_info->name);
447 stat_list = g_list_append(stat_list, if_stat);
452 cmdarg_err("There are no interfaces on which a capture can be done");
456 if (!machine_readable) {
457 printf("%-15s %10s %10s\n", "Interface", "Received",
462 /* handle SIGPIPE signal to default action */
463 act.sa_handler = SIG_DFL;
464 sigemptyset(&act.sa_mask);
465 act.sa_flags = SA_RESTART;
466 sigaction(SIGPIPE,&act,NULL);
470 while (global_ld.go) {
471 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
472 if_stat = stat_entry->data;
473 pcap_stats(if_stat->pch, &ps);
475 if (!machine_readable) {
476 printf("%-15s %10u %10u\n", if_stat->name,
477 ps.ps_recv, ps.ps_drop);
479 printf("%s\t%u\t%u\n", if_stat->name,
480 ps.ps_recv, ps.ps_drop);
491 /* XXX - Not reached. Should we look for 'q' in stdin? */
492 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
493 if_stat = stat_entry->data;
494 pcap_close(if_stat->pch);
495 g_free(if_stat->name);
498 g_list_free(stat_list);
499 free_interface_list(if_list);
507 capture_cleanup(DWORD dwCtrlType)
509 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
510 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
511 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
512 like SIGTERM at least when the machine's shutting down.
514 For now, if we're running as a command rather than a capture child,
515 we handle all but CTRL_LOGOFF_EVENT as indications that we should
516 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
519 If we're not running as a capture child, we might be running as
520 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
521 user logs out. (XXX - can we explicitly check whether we're
522 running as a service?) */
524 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
525 "Console: Control signal");
526 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
527 "Console: Control signal, CtrlType: %u", dwCtrlType);
529 /* Keep capture running if we're a service and a user logs off */
530 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
539 capture_cleanup(int signum)
541 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
542 SIGTERM. We assume that if the user wanted it to keep running
543 after they logged out, they'd have nohupped it. */
545 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
547 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
548 "Console: Signal, signal value: %u", signum);
554 static void exit_main(int status)
557 /* Shutdown windows sockets */
560 /* can be helpful for debugging */
562 printf("Press any key\n");
573 * If we were linked with libcap (not libpcap), make sure we have
574 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
575 * (See comment in main() for details)
579 #if 0 /* Set to enable capability debugging */
580 /* see 'man cap_to_text()' for explanation of output */
581 /* '=' means 'all= ' ie: no capabilities */
582 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
584 print_caps(char *pfx) {
585 cap_t caps = cap_get_proc();
586 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
587 "%s: EUID: %d Capabilities: %s", pfx,
588 geteuid(), cap_to_text(caps, NULL));
591 print_caps(char *pfx _U_) {
596 relinquish_privs_except_capture(void)
598 /* If 'started_with_special_privs' (ie: suid) then enable for
599 * ourself the NET_ADMIN and NET_RAW capabilities and then
600 * drop our suid privileges.
602 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
603 * stuff we don't need (and shouldn't have).
604 * CAP_NET_RAW: Packet capture (raw sockets).
607 if (started_with_special_privs()) {
608 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
609 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
611 cap_t caps = cap_init(); /* all capabilities initialized to off */
613 print_caps("Pre drop, pre set");
615 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
616 cmdarg_err("prctl() fail return: %s", strerror(errno));
619 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
620 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
622 if (cap_set_proc(caps)) {
623 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
625 print_caps("Pre drop, post set");
627 relinquish_special_privs_perm();
629 print_caps("Post drop, pre set");
630 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
631 if (cap_set_proc(caps)) {
632 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
634 print_caps("Post drop, post set");
642 relinquish_all_capabilities()
644 /* Drop any and all capabilities this process may have. */
645 /* Allowed whether or not process has any privileges. */
646 cap_t caps = cap_init(); /* all capabilities initialized to off */
647 print_caps("Pre-clear");
648 if (cap_set_proc(caps)) {
649 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
651 print_caps("Post-clear");
655 #endif /* HAVE_LIBCAP */
657 /* Take care of byte order in the libpcap headers read from pipes.
658 * (function taken from wiretap/libpcap.c) */
660 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
663 /* Byte-swap the record header fields. */
664 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
665 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
666 rechdr->incl_len = BSWAP32(rechdr->incl_len);
667 rechdr->orig_len = BSWAP32(rechdr->orig_len);
670 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
671 swapped, in order to match the BPF header layout.
673 Unfortunately, some files were, according to a comment in the "libpcap"
674 source, written with version 2.3 in their headers but without the
675 interchanged fields, so if "incl_len" is greater than "orig_len" - which
676 would make no sense - we assume that we need to swap them. */
677 if (hdr->version_major == 2 &&
678 (hdr->version_minor < 3 ||
679 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
682 temp = rechdr->orig_len;
683 rechdr->orig_len = rechdr->incl_len;
684 rechdr->incl_len = temp;
688 /* Provide select() functionality for a single file descriptor
689 * on both UNIX/POSIX and Windows.
691 * The Windows version calls WaitForSingleObject instead of
694 * Returns the same values as select. If an error is returned,
695 * the string cap_pipe_err_str should be used instead of errno.
698 cap_pipe_select(int pipe_fd) {
701 struct timeval timeout, *pto;
704 cap_pipe_err_str = "Unknown error";
707 FD_SET(pipe_fd, &rfds);
710 timeout.tv_usec = CAP_READ_TIMEOUT * 1000;
713 sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, pto);
715 cap_pipe_err_str = strerror(errno);
719 /* XXX - Should we just use file handles exclusively under Windows?
720 * Otherwise we have to convert between file handles and file descriptors
721 * here and when we open a named pipe.
723 HANDLE hPipe = (HANDLE) _get_osfhandle(pipe_fd);
727 if (hPipe == INVALID_HANDLE_VALUE) {
728 cap_pipe_err_str = "Could not open standard input";
732 cap_pipe_err_str = "Unknown error";
734 wait_ret = WaitForSingleObject(hPipe, CAP_READ_TIMEOUT);
736 /* XXX - This probably isn't correct */
745 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
746 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
747 cap_pipe_err_str = utf_16to8(err_str);
751 g_assert_not_reached();
758 /* Mimic pcap_open_live() for pipe captures
759 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
761 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
762 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
764 cap_pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
765 char *errmsg, int errmsgl)
768 struct stat pipe_stat;
780 unsigned int bytes_read;
782 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
785 * XXX (T)Wireshark blocks until we return
787 if (strcmp(pipename, "-") == 0) {
788 fd = 0; /* read from stdin */
791 * This is needed to set the stdin pipe into binary mode, otherwise
792 * CR/LF are mangled...
794 _setmode(0, _O_BINARY);
798 if (ws_stat(pipename, &pipe_stat) < 0) {
799 if (errno == ENOENT || errno == ENOTDIR)
800 ld->cap_pipe_err = PIPNEXIST;
802 g_snprintf(errmsg, errmsgl,
803 "The capture session could not be initiated "
804 "due to error on pipe: %s", strerror(errno));
805 ld->cap_pipe_err = PIPERR;
809 if (! S_ISFIFO(pipe_stat.st_mode)) {
810 if (S_ISCHR(pipe_stat.st_mode)) {
812 * Assume the user specified an interface on a system where
813 * interfaces are in /dev. Pretend we haven't seen it.
815 ld->cap_pipe_err = PIPNEXIST;
818 g_snprintf(errmsg, errmsgl,
819 "The capture session could not be initiated because\n"
820 "\"%s\" is neither an interface nor a pipe", pipename);
821 ld->cap_pipe_err = PIPERR;
825 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
827 g_snprintf(errmsg, errmsgl,
828 "The capture session could not be initiated "
829 "due to error on pipe open: %s", strerror(errno));
830 ld->cap_pipe_err = PIPERR;
834 #define PIPE_STR "\\pipe\\"
835 /* Under Windows, named pipes _must_ have the form
836 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
838 pncopy = g_strdup(pipename);
839 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
840 pos = strchr(pncopy + 3, '\\');
841 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
848 g_snprintf(errmsg, errmsgl,
849 "The capture session could not be initiated because\n"
850 "\"%s\" is neither an interface nor a pipe", pipename);
851 ld->cap_pipe_err = PIPNEXIST;
855 /* Wait for the pipe to appear */
857 hPipe = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
858 OPEN_EXISTING, 0, NULL);
860 if (hPipe != INVALID_HANDLE_VALUE)
863 if (GetLastError() != ERROR_PIPE_BUSY) {
864 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
865 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
866 g_snprintf(errmsg, errmsgl,
867 "The capture session on \"%s\" could not be initiated "
868 "due to error on pipe open: pipe busy: %s (error %d)",
869 pipename, utf_16to8(err_str), GetLastError());
871 ld->cap_pipe_err = PIPERR;
875 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
876 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
877 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
878 g_snprintf(errmsg, errmsgl,
879 "The capture session could not be initiated "
880 "due to error on named pipe open: %s (error %d)",
881 utf_16to8(err_str), GetLastError());
883 ld->cap_pipe_err = PIPERR;
888 fd = _open_osfhandle((long) hPipe, _O_RDONLY);
890 g_snprintf(errmsg, errmsgl,
891 "The capture session could not be initiated "
892 "due to error on pipe open: %s", strerror(errno));
893 ld->cap_pipe_err = PIPERR;
899 ld->from_cap_pipe = TRUE;
901 /* read the pcap header */
903 while (bytes_read < sizeof magic) {
904 sel_ret = cap_pipe_select(fd);
906 g_snprintf(errmsg, errmsgl,
907 "Unexpected error from select: %s", strerror(errno));
909 } else if (sel_ret > 0) {
910 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
913 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
915 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
925 /* Host that wrote it has our byte order, and was running
926 a program using either standard or ss990417 libpcap. */
927 ld->cap_pipe_byte_swapped = FALSE;
928 ld->cap_pipe_modified = FALSE;
930 case PCAP_MODIFIED_MAGIC:
931 /* Host that wrote it has our byte order, but was running
932 a program using either ss990915 or ss991029 libpcap. */
933 ld->cap_pipe_byte_swapped = FALSE;
934 ld->cap_pipe_modified = TRUE;
936 case PCAP_SWAPPED_MAGIC:
937 /* Host that wrote it has a byte order opposite to ours,
938 and was running a program using either standard or
940 ld->cap_pipe_byte_swapped = TRUE;
941 ld->cap_pipe_modified = FALSE;
943 case PCAP_SWAPPED_MODIFIED_MAGIC:
944 /* Host that wrote it out has a byte order opposite to
945 ours, and was running a program using either ss990915
946 or ss991029 libpcap. */
947 ld->cap_pipe_byte_swapped = TRUE;
948 ld->cap_pipe_modified = TRUE;
951 /* Not a "libpcap" type we know about. */
952 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
956 /* Read the rest of the header */
958 while (bytes_read < sizeof(struct pcap_hdr)) {
959 sel_ret = cap_pipe_select(fd);
961 g_snprintf(errmsg, errmsgl,
962 "Unexpected error from select: %s", strerror(errno));
964 } else if (sel_ret > 0) {
965 b = read(fd, ((char *)hdr)+bytes_read,
966 sizeof(struct pcap_hdr) - bytes_read);
969 g_snprintf(errmsg, errmsgl, "End of file on pipe during open");
971 g_snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
979 if (ld->cap_pipe_byte_swapped) {
980 /* Byte-swap the header fields about which we care. */
981 hdr->version_major = BSWAP16(hdr->version_major);
982 hdr->version_minor = BSWAP16(hdr->version_minor);
983 hdr->snaplen = BSWAP32(hdr->snaplen);
984 hdr->network = BSWAP32(hdr->network);
986 ld->linktype = hdr->network;
988 if (hdr->version_major < 2) {
989 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
993 ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
994 ld->cap_pipe_err = PIPOK;
998 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
999 ld->cap_pipe_err = PIPERR;
1006 /* We read one record from the pipe, take care of byte order in the record
1007 * header, write the record to the capture file, and update capture statistics. */
1009 cap_pipe_dispatch(loop_data *ld, guchar *data, char *errmsg, int errmsgl)
1011 struct pcap_pkthdr phdr;
1013 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1017 #ifdef LOG_CAPTURE_VERBOSE
1018 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
1021 switch (ld->cap_pipe_state) {
1023 case STATE_EXPECT_REC_HDR:
1024 ld->cap_pipe_bytes_to_read = ld->cap_pipe_modified ?
1025 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
1026 ld->cap_pipe_bytes_read = 0;
1027 ld->cap_pipe_state = STATE_READ_REC_HDR;
1030 case STATE_READ_REC_HDR:
1031 b = read(ld->cap_pipe_fd, ((char *)&ld->cap_pipe_rechdr)+ld->cap_pipe_bytes_read,
1032 ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
1035 result = PD_PIPE_EOF;
1037 result = PD_PIPE_ERR;
1040 if ((ld->cap_pipe_bytes_read += b) < ld->cap_pipe_bytes_to_read)
1042 result = PD_REC_HDR_READ;
1045 case STATE_EXPECT_DATA:
1046 ld->cap_pipe_bytes_read = 0;
1047 ld->cap_pipe_state = STATE_READ_DATA;
1050 case STATE_READ_DATA:
1051 b = read(ld->cap_pipe_fd, data+ld->cap_pipe_bytes_read,
1052 ld->cap_pipe_rechdr.hdr.incl_len - ld->cap_pipe_bytes_read);
1055 result = PD_PIPE_EOF;
1057 result = PD_PIPE_ERR;
1060 if ((ld->cap_pipe_bytes_read += b) < ld->cap_pipe_rechdr.hdr.incl_len)
1062 result = PD_DATA_READ;
1066 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
1069 } /* switch (ld->cap_pipe_state) */
1072 * We've now read as much data as we were expecting, so process it.
1076 case PD_REC_HDR_READ:
1077 /* We've read the header. Take care of byte order. */
1078 cap_pipe_adjust_header(ld->cap_pipe_byte_swapped, &ld->cap_pipe_hdr,
1079 &ld->cap_pipe_rechdr.hdr);
1080 if (ld->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
1081 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
1082 ld->packet_count+1, ld->cap_pipe_rechdr.hdr.incl_len);
1085 ld->cap_pipe_state = STATE_EXPECT_DATA;
1089 /* Fill in a "struct pcap_pkthdr", and process the packet. */
1090 phdr.ts.tv_sec = ld->cap_pipe_rechdr.hdr.ts_sec;
1091 phdr.ts.tv_usec = ld->cap_pipe_rechdr.hdr.ts_usec;
1092 phdr.caplen = ld->cap_pipe_rechdr.hdr.incl_len;
1093 phdr.len = ld->cap_pipe_rechdr.hdr.orig_len;
1095 capture_loop_packet_cb((u_char *)ld, &phdr, data);
1097 ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
1101 ld->cap_pipe_err = PIPEOF;
1105 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
1112 ld->cap_pipe_err = PIPERR;
1113 /* Return here rather than inside the switch to prevent GCC warning */
1118 /** Open the capture input file (pcap or capture pipe).
1119 * Returns TRUE if it succeeds, FALSE otherwise. */
1121 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
1122 char *errmsg, size_t errmsg_len,
1123 char *secondary_errmsg, size_t secondary_errmsg_len)
1125 gchar open_err_str[PCAP_ERRBUF_SIZE];
1126 gchar *sync_msg_str;
1127 static const char ppamsg[] = "can't find PPA for ";
1128 const char *set_linktype_err_str;
1129 const char *libpcap_warn;
1131 gchar *sync_secondary_msg_str;
1133 WORD wVersionRequested;
1136 #ifdef HAVE_PCAP_REMOTE
1137 struct pcap_rmtauth auth;
1141 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", capture_opts->iface);
1144 /* XXX - opening Winsock on tshark? */
1146 /* Initialize Windows Socket if we are in a WIN32 OS
1147 This needs to be done before querying the interface for network/netmask */
1149 /* XXX - do we really require 1.1 or earlier?
1150 Are there any versions that support only 2.0 or higher? */
1151 wVersionRequested = MAKEWORD(1, 1);
1152 err = WSAStartup(wVersionRequested, &wsaData);
1156 case WSASYSNOTREADY:
1157 g_snprintf(errmsg, (gulong) errmsg_len,
1158 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
1161 case WSAVERNOTSUPPORTED:
1162 g_snprintf(errmsg, (gulong) errmsg_len,
1163 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
1164 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
1167 case WSAEINPROGRESS:
1168 g_snprintf(errmsg, (gulong) errmsg_len,
1169 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
1173 g_snprintf(errmsg, (gulong) errmsg_len,
1174 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
1178 g_snprintf(errmsg, (gulong) errmsg_len,
1179 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
1183 g_snprintf(errmsg, (gulong) errmsg_len,
1184 "Couldn't initialize Windows Sockets: error %d", err);
1187 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
1192 /* Open the network interface to capture from it.
1193 Some versions of libpcap may put warnings into the error buffer
1194 if they succeed; to tell if that's happened, we have to clear
1195 the error buffer, and check if it's still a null string. */
1196 open_err_str[0] = '\0';
1197 #ifdef HAVE_PCAP_OPEN
1198 auth.type = capture_opts->auth_type == CAPTURE_AUTH_PWD ?
1199 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
1200 auth.username = capture_opts->auth_username;
1201 auth.password = capture_opts->auth_password;
1203 ld->pcap_h = pcap_open(capture_opts->iface,
1204 capture_opts->has_snaplen ? capture_opts->snaplen :
1205 WTAP_MAX_PACKET_SIZE,
1207 (capture_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
1208 (capture_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
1209 (capture_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
1210 CAP_READ_TIMEOUT, &auth, open_err_str);
1212 ld->pcap_h = pcap_open_live(capture_opts->iface,
1213 capture_opts->has_snaplen ? capture_opts->snaplen :
1214 WTAP_MAX_PACKET_SIZE,
1215 capture_opts->promisc_mode, CAP_READ_TIMEOUT,
1219 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
1220 /* to remove any suid privileges. */
1221 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
1222 /* (euid/egid have already previously been set to ruid/rgid. */
1223 /* (See comment in main() for details) */
1225 relinquish_special_privs_perm();
1227 relinquish_all_capabilities();
1230 if (ld->pcap_h != NULL) {
1231 /* we've opened "iface" as a network device */
1233 /* try to set the capture buffer size */
1234 if (capture_opts->buffer_size > 1 &&
1235 pcap_setbuff(ld->pcap_h, capture_opts->buffer_size * 1024 * 1024) != 0) {
1236 sync_secondary_msg_str = g_strdup_printf(
1237 "The capture buffer size of %luMB seems to be too high for your machine,\n"
1238 "the default of 1MB will be used.\n"
1240 "Nonetheless, the capture is started.\n",
1241 capture_opts->buffer_size);
1242 report_capture_error("Couldn't set the capture buffer size!",
1243 sync_secondary_msg_str);
1244 g_free(sync_secondary_msg_str);
1248 #if defined(HAVE_PCAP_REMOTE) && defined(HAVE_PCAP_SETSAMPLING)
1249 if (capture_opts->sampling_method != CAPTURE_SAMP_NONE)
1251 struct pcap_samp *samp;
1253 if ((samp = pcap_setsampling(ld->pcap_h)) != NULL)
1255 switch (capture_opts->sampling_method)
1257 case CAPTURE_SAMP_BY_COUNT:
1258 samp->method = PCAP_SAMP_1_EVERY_N;
1261 case CAPTURE_SAMP_BY_TIMER:
1262 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
1266 sync_msg_str = g_strdup_printf(
1267 "Unknown sampling method %d specified,\n"
1268 "continue without packet sampling",
1269 capture_opts->sampling_method);
1270 report_capture_error("Couldn't set the capture "
1271 "sampling", sync_msg_str);
1272 g_free(sync_msg_str);
1274 samp->value = capture_opts->sampling_param;
1278 report_capture_error("Couldn't set the capture sampling",
1279 "Cannot get packet sampling data structure");
1285 /* setting the data link type only works on real interfaces */
1286 if (capture_opts->linktype != -1) {
1287 set_linktype_err_str = set_pcap_linktype(ld->pcap_h, capture_opts->iface,
1288 capture_opts->linktype);
1289 if (set_linktype_err_str != NULL) {
1290 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
1291 set_linktype_err_str);
1292 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
1296 ld->linktype = get_pcap_linktype(ld->pcap_h, capture_opts->iface);
1298 /* We couldn't open "iface" as a network device. */
1299 /* Try to open it as a pipe */
1300 ld->cap_pipe_fd = cap_pipe_open_live(capture_opts->iface, &ld->cap_pipe_hdr, ld, errmsg, (int) errmsg_len);
1302 if (ld->cap_pipe_fd == -1) {
1304 if (ld->cap_pipe_err == PIPNEXIST) {
1305 /* Pipe doesn't exist, so output message for interface */
1307 /* If we got a "can't find PPA for X" message, warn the user (who
1308 is running (T)Wireshark on HP-UX) that they don't have a version
1309 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1310 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1311 PPA for X" rather than "can't find PPA for X"). */
1312 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1315 "You are running (T)Wireshark with a version of the libpcap library\n"
1316 "that doesn't handle HP-UX network devices well; this means that\n"
1317 "(T)Wireshark may not be able to capture packets.\n"
1319 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1320 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1321 "packaged binary form from the Software Porting And Archive Centre\n"
1322 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1323 "at the URL lists a number of mirror sites.";
1326 g_snprintf(errmsg, (gulong) errmsg_len,
1327 "The capture session could not be initiated (%s).", open_err_str);
1329 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
1330 "Please check to make sure you have sufficient permissions, and that you have "
1331 "the proper interface or pipe specified.%s", libpcap_warn);
1333 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
1335 "Please check that \"%s\" is the proper interface.\n"
1338 "Help can be found at:\n"
1340 " http://wiki.wireshark.org/WinPcap\n"
1341 " http://wiki.wireshark.org/CaptureSetup\n",
1342 capture_opts->iface);
1346 * Else pipe (or file) does exist and cap_pipe_open_live() has
1351 /* cap_pipe_open_live() succeeded; don't want
1352 error message from pcap_open_live() */
1353 open_err_str[0] = '\0';
1356 /* XXX - will this work for tshark? */
1357 #ifdef MUST_DO_SELECT
1358 if (!ld->from_cap_pipe) {
1359 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
1360 ld->pcap_fd = pcap_get_selectable_fd(ld->pcap_h);
1362 ld->pcap_fd = pcap_fileno(ld->pcap_h);
1367 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1368 returned a warning; print it, but keep capturing. */
1369 if (open_err_str[0] != '\0') {
1370 sync_msg_str = g_strdup_printf("%s.", open_err_str);
1371 report_capture_error(sync_msg_str, "");
1372 g_free(sync_msg_str);
1379 /* close the capture input file (pcap or capture pipe) */
1380 static void capture_loop_close_input(loop_data *ld) {
1382 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
1384 /* if open, close the capture pipe "input file" */
1385 if (ld->cap_pipe_fd >= 0) {
1386 g_assert(ld->from_cap_pipe);
1387 ws_close(ld->cap_pipe_fd);
1388 ld->cap_pipe_fd = 0;
1391 /* if open, close the pcap "input file" */
1392 if(ld->pcap_h != NULL) {
1393 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", ld->pcap_h);
1394 g_assert(!ld->from_cap_pipe);
1395 pcap_close(ld->pcap_h);
1402 /* Shut down windows sockets */
1408 /* init the capture filter */
1409 static initfilter_status_t
1410 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe, gchar * iface, gchar * cfilter) {
1411 bpf_u_int32 netnum, netmask;
1412 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1413 struct bpf_program fcode;
1416 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
1418 /* capture filters only work on real interfaces */
1419 if (cfilter && !from_cap_pipe) {
1420 /* A capture filter was specified; set it up. */
1421 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1423 * Well, we can't get the netmask for this interface; it's used
1424 * only for filters that check for broadcast IP addresses, so
1425 * we just punt and use 0. It might be nice to warn the user,
1426 * but that's a pain in a GUI application, as it'd involve popping
1427 * up a message box, and it's not clear how often this would make
1428 * a difference (only filters that check for IP broadcast addresses
1432 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
1435 if (pcap_compile(pcap_h, &fcode, cfilter, 1, netmask) < 0) {
1436 /* Treat this specially - our caller might try to compile this
1437 as a display filter and, if that succeeds, warn the user that
1438 the display and capture filter syntaxes are different. */
1439 return INITFILTER_BAD_FILTER;
1441 if (pcap_setfilter(pcap_h, &fcode) < 0) {
1442 #ifdef HAVE_PCAP_FREECODE
1443 pcap_freecode(&fcode);
1445 return INITFILTER_OTHER_ERROR;
1447 #ifdef HAVE_PCAP_FREECODE
1448 pcap_freecode(&fcode);
1452 return INITFILTER_NO_ERROR;
1456 /* set up to write to the already-opened capture output file/files */
1458 capture_loop_init_output(capture_options *capture_opts, int save_file_fd, loop_data *ld, char *errmsg, int errmsg_len) {
1462 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
1465 if (ld->from_cap_pipe) {
1466 ld->file_snaplen = ld->cap_pipe_hdr.snaplen;
1469 ld->file_snaplen = pcap_snapshot(ld->pcap_h);
1472 /* Set up to write to the capture file. */
1473 if (capture_opts->multi_files_on) {
1474 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
1476 ld->pdh = libpcap_fdopen(save_file_fd, &err);
1479 gboolean successful;
1481 ld->bytes_written = 0;
1482 if (capture_opts->use_pcapng) {
1485 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
1486 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err) &&
1487 libpcap_write_interface_description_block(ld->pdh, capture_opts->iface, capture_opts->cfilter, ld->linktype, ld->file_snaplen, &ld->bytes_written, &err);
1489 successful = libpcap_write_file_header(ld->pdh, ld->linktype, ld->file_snaplen,
1490 &ld->bytes_written, &err);
1498 if (ld->pdh == NULL) {
1499 /* We couldn't set up to write to the capture file. */
1500 /* XXX - use cf_open_error_message from tshark instead? */
1503 case WTAP_ERR_CANT_OPEN:
1504 g_snprintf(errmsg, errmsg_len, "The file to which the capture would be saved"
1505 " couldn't be created for some unknown reason.");
1508 case WTAP_ERR_SHORT_WRITE:
1509 g_snprintf(errmsg, errmsg_len, "A full header couldn't be written to the file"
1510 " to which the capture would be saved.");
1515 g_snprintf(errmsg, errmsg_len,
1516 "The file to which the capture would be"
1517 " saved (\"%s\") could not be opened: Error %d.",
1518 capture_opts->save_file, err);
1520 g_snprintf(errmsg, errmsg_len,
1521 "The file to which the capture would be"
1522 " saved (\"%s\") could not be opened: %s.",
1523 capture_opts->save_file, strerror(err));
1535 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close) {
1537 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
1539 if (capture_opts->multi_files_on) {
1540 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
1542 if (capture_opts->use_pcapng) {
1543 libpcap_write_interface_statistics_block(ld->pdh, 0, ld->pcap_h, &ld->bytes_written, err_close);
1545 return libpcap_dump_close(ld->pdh, err_close);
1549 /* dispatch incoming packets (pcap or capture pipe)
1551 * Waits for incoming packets to be available, and calls pcap_dispatch()
1552 * to cause them to be processed.
1554 * Returns the number of packets which were processed.
1556 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
1557 * packet-batching behaviour does not cause packets to get held back
1561 capture_loop_dispatch(capture_options *capture_opts _U_, loop_data *ld,
1562 char *errmsg, int errmsg_len)
1566 gint packet_count_before;
1567 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1569 packet_count_before = ld->packet_count;
1570 if (ld->from_cap_pipe) {
1571 /* dispatch from capture pipe */
1572 #ifdef LOG_CAPTURE_VERBOSE
1573 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
1575 sel_ret = cap_pipe_select(ld->cap_pipe_fd);
1578 if (sel_ret < 0 && errno != EINTR) {
1579 g_snprintf(errmsg, errmsg_len,
1580 "Unexpected error from select: %s", strerror(errno));
1581 report_capture_error(errmsg, please_report);
1586 * "select()" says we can read from the pipe without blocking
1588 inpkts = cap_pipe_dispatch(ld, pcap_data, errmsg, errmsg_len);
1596 /* dispatch from pcap */
1597 #ifdef MUST_DO_SELECT
1599 * If we have "pcap_get_selectable_fd()", we use it to get the
1600 * descriptor on which to select; if that's -1, it means there
1601 * is no descriptor on which you can do a "select()" (perhaps
1602 * because you're capturing on a special device, and that device's
1603 * driver unfortunately doesn't support "select()", in which case
1604 * we don't do the select - which means it might not be possible
1605 * to stop a capture until a packet arrives. If that's unacceptable,
1606 * plead with whoever supplies the software for that device to add
1607 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
1608 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
1609 * later, so it can use pcap_breakloop().
1611 #ifdef LOG_CAPTURE_VERBOSE
1612 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
1614 if (ld->pcap_fd != -1) {
1615 sel_ret = cap_pipe_select(ld->pcap_fd);
1618 * "select()" says we can read from it without blocking; go for
1621 * We don't have pcap_breakloop(), so we only process one packet
1622 * per pcap_dispatch() call, to allow a signal to stop the
1623 * processing immediately, rather than processing all packets
1624 * in a batch before quitting.
1626 inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb,
1629 ld->pcap_err = TRUE;
1630 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
1633 if (sel_ret < 0 && errno != EINTR) {
1634 g_snprintf(errmsg, errmsg_len,
1635 "Unexpected error from select: %s", strerror(errno));
1636 report_capture_error(errmsg, please_report);
1642 #endif /* MUST_DO_SELECT */
1644 /* dispatch from pcap without select */
1646 #ifdef LOG_CAPTURE_VERBOSE
1647 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
1651 * On Windows, we don't support asynchronously telling a process to
1652 * stop capturing; instead, we check for an indication on a pipe
1653 * after processing packets. We therefore process only one packet
1654 * at a time, so that we can check the pipe after every packet.
1656 inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb, (u_char *) ld);
1658 inpkts = pcap_dispatch(ld->pcap_h, -1, capture_loop_packet_cb, (u_char *) ld);
1662 /* Error, rather than pcap_breakloop(). */
1663 ld->pcap_err = TRUE;
1665 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
1667 #else /* pcap_next_ex */
1668 #ifdef LOG_CAPTURE_VERBOSE
1669 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
1671 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
1674 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
1675 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
1676 * This should be fixed in the WinPcap 4.0 alpha release.
1678 * For reference, an example remote interface:
1679 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
1682 /* emulate dispatch from pcap */
1685 struct pcap_pkthdr *pkt_header;
1690 (in = pcap_next_ex(ld->pcap_h, &pkt_header, &pkt_data)) == 1)
1691 capture_loop_packet_cb( (u_char *) ld, pkt_header, pkt_data);
1694 ld->pcap_err = TRUE;
1698 #endif /* pcap_next_ex */
1702 #ifdef LOG_CAPTURE_VERBOSE
1703 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
1706 return ld->packet_count - packet_count_before;
1710 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
1711 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
1713 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
1714 char *errmsg, int errmsg_len) {
1716 char tmpname[128+1];
1717 gchar *capfile_name;
1718 gboolean is_tempfile;
1723 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
1724 (capture_opts->save_file) ? capture_opts->save_file : "");
1726 if (capture_opts->save_file != NULL) {
1727 /* We return to the caller while the capture is in progress.
1728 * Therefore we need to take a copy of save_file in
1729 * case the caller destroys it after we return.
1731 capfile_name = g_strdup(capture_opts->save_file);
1733 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
1734 if (capture_opts->multi_files_on) {
1735 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
1736 g_snprintf(errmsg, errmsg_len,
1737 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
1738 g_free(capfile_name);
1741 if (strcmp(capfile_name, "-") == 0) {
1742 /* write to stdout */
1745 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
1746 _setmode(1, O_BINARY);
1749 } /* if (...output_to_pipe ... */
1752 if (capture_opts->multi_files_on) {
1753 /* ringbuffer is enabled */
1754 *save_file_fd = ringbuf_init(capfile_name,
1755 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0);
1757 /* we need the ringbuf name */
1758 if(*save_file_fd != -1) {
1759 g_free(capfile_name);
1760 capfile_name = g_strdup(ringbuf_current_filename());
1763 /* Try to open/create the specified file for use as a capture buffer. */
1764 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
1768 is_tempfile = FALSE;
1770 /* Choose a random name for the temporary capture buffer */
1771 *save_file_fd = create_tempfile(tmpname, sizeof tmpname, "wireshark");
1772 capfile_name = g_strdup(tmpname);
1776 /* did we fail to open the output file? */
1777 if (*save_file_fd == -1) {
1779 g_snprintf(errmsg, errmsg_len,
1780 "The temporary file to which the capture would be saved (\"%s\") "
1781 "could not be opened: %s.", capfile_name, strerror(errno));
1783 if (capture_opts->multi_files_on) {
1784 ringbuf_error_cleanup();
1787 g_snprintf(errmsg, errmsg_len,
1788 "The file to which the capture would be saved (\"%s\") "
1789 "could not be opened: %s.", capfile_name,
1792 g_free(capfile_name);
1796 if(capture_opts->save_file != NULL) {
1797 g_free(capture_opts->save_file);
1799 capture_opts->save_file = capfile_name;
1800 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
1801 "g_free(capfile_name)". */
1803 ret = fchown(*save_file_fd, capture_opts->owner, capture_opts->group);
1811 capture_loop_stop_signal_handler(int signo _U_)
1813 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Signal: Stop capture");
1814 capture_loop_stop();
1818 #define TIME_GET() GetTickCount()
1820 #define TIME_GET() time(NULL)
1823 /* Do the low-level work of a capture.
1824 Returns TRUE if it succeeds, FALSE otherwise. */
1826 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
1829 struct sigaction act;
1831 time_t upd_time, cur_time;
1835 gint inpkts_to_sync_pipe = 0; /* packets not already send out to the sync_pipe */
1836 condition *cnd_file_duration = NULL;
1837 condition *cnd_autostop_files = NULL;
1838 condition *cnd_autostop_size = NULL;
1839 condition *cnd_autostop_duration = NULL;
1840 guint32 autostop_files = 0;
1843 gboolean cfilter_error = FALSE;
1844 #define MSG_MAX_LENGTH 4096
1845 char errmsg[MSG_MAX_LENGTH+1];
1846 char secondary_errmsg[MSG_MAX_LENGTH+1];
1847 int save_file_fd = -1;
1850 *secondary_errmsg = '\0';
1852 /* init the loop data */
1853 global_ld.go = TRUE;
1854 global_ld.packet_count = 0;
1855 if (capture_opts->has_autostop_packets)
1856 global_ld.packet_max = capture_opts->autostop_packets;
1858 global_ld.packet_max = 0; /* no limit */
1859 global_ld.err = 0; /* no error seen yet */
1860 global_ld.wtap_linktype = WTAP_ENCAP_UNKNOWN;
1861 global_ld.pcap_err = FALSE;
1862 global_ld.from_cap_pipe = FALSE;
1863 global_ld.pdh = NULL;
1864 global_ld.cap_pipe_fd = -1;
1865 #ifdef MUST_DO_SELECT
1866 global_ld.pcap_fd = 0;
1869 /* We haven't yet gotten the capture statistics. */
1870 *stats_known = FALSE;
1874 * Catch SIGUSR1, so that we exit cleanly if the parent process
1875 * kills us with it due to the user selecting "Capture->Stop".
1877 act.sa_handler = capture_loop_stop_signal_handler;
1879 * Arrange that system calls not get restarted, because when
1880 * our signal handler returns we don't want to restart
1881 * a call that was waiting for packets to arrive.
1884 sigemptyset(&act.sa_mask);
1885 sigaction(SIGUSR1, &act, NULL);
1888 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
1889 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
1891 /* open the "input file" from network interface or capture pipe */
1892 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
1893 secondary_errmsg, sizeof(secondary_errmsg))) {
1897 /* init the input filter from the network interface (capture pipe will do nothing) */
1898 switch (capture_loop_init_filter(global_ld.pcap_h, global_ld.from_cap_pipe,
1899 capture_opts->iface,
1900 capture_opts->cfilter)) {
1902 case INITFILTER_NO_ERROR:
1905 case INITFILTER_BAD_FILTER:
1906 cfilter_error = TRUE;
1907 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(global_ld.pcap_h));
1910 case INITFILTER_OTHER_ERROR:
1911 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
1912 pcap_geterr(global_ld.pcap_h));
1913 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
1917 /* If we're supposed to write to a capture file, open it for output
1918 (temporary/specified name/ringbuffer) */
1919 if (capture_opts->saving_to_file) {
1920 if (!capture_loop_open_output(capture_opts, &save_file_fd, errmsg, sizeof(errmsg))) {
1924 /* set up to write to the already-opened capture output file/files */
1925 if (!capture_loop_init_output(capture_opts, save_file_fd, &global_ld,
1926 errmsg, sizeof(errmsg))) {
1930 /* XXX - capture SIGTERM and close the capture, in case we're on a
1931 Linux 2.0[.x] system and you have to explicitly close the capture
1932 stream in order to turn promiscuous mode off? We need to do that
1933 in other places as well - and I don't think that works all the
1934 time in any case, due to libpcap bugs. */
1936 /* Well, we should be able to start capturing.
1938 Sync out the capture file, so the header makes it to the file system,
1939 and send a "capture started successfully and capture file created"
1940 message to our parent so that they'll open the capture file and
1941 update its windows to indicate that we have a live capture in
1943 libpcap_dump_flush(global_ld.pdh, NULL);
1944 report_new_capture_file(capture_opts->save_file);
1947 /* initialize capture stop (and alike) conditions */
1948 init_capture_stop_conditions();
1949 /* create stop conditions */
1950 if (capture_opts->has_autostop_filesize)
1952 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
1953 if (capture_opts->has_autostop_duration)
1954 cnd_autostop_duration =
1955 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
1957 if (capture_opts->multi_files_on) {
1958 if (capture_opts->has_file_duration)
1960 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
1962 if (capture_opts->has_autostop_files)
1963 cnd_autostop_files =
1964 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
1967 /* init the time values */
1968 start_time = TIME_GET();
1969 upd_time = TIME_GET();
1971 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
1973 /* WOW, everything is prepared! */
1974 /* please fasten your seat belts, we will enter now the actual capture loop */
1975 while (global_ld.go) {
1976 /* dispatch incoming packets */
1977 inpkts = capture_loop_dispatch(capture_opts, &global_ld, errmsg,
1981 /* any news from our parent (signal pipe)? -> just stop the capture */
1982 if (!signal_pipe_check_running()) {
1983 global_ld.go = FALSE;
1988 inpkts_to_sync_pipe += inpkts;
1990 /* check capture size condition */
1991 if (cnd_autostop_size != NULL &&
1992 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)){
1993 /* Capture size limit reached, do we have another file? */
1994 if (capture_opts->multi_files_on) {
1995 if (cnd_autostop_files != NULL &&
1996 cnd_eval(cnd_autostop_files, ++autostop_files)) {
1997 /* no files left: stop here */
1998 global_ld.go = FALSE;
2002 /* Switch to the next ringbuffer file */
2003 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2004 &save_file_fd, &global_ld.err)) {
2005 gboolean successful;
2007 /* File switch succeeded: reset the conditions */
2008 global_ld.bytes_written = 0;
2009 if (capture_opts->use_pcapng) {
2012 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2013 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &global_ld.bytes_written, &global_ld.err) &&
2014 libpcap_write_interface_description_block(global_ld.pdh, capture_opts->iface, capture_opts->cfilter, global_ld.linktype, global_ld.file_snaplen, &global_ld.bytes_written, &global_ld.err);
2016 successful = libpcap_write_file_header(global_ld.pdh, global_ld.linktype, global_ld.file_snaplen,
2017 &global_ld.bytes_written, &global_ld.err);
2020 fclose(global_ld.pdh);
2021 global_ld.pdh = NULL;
2022 global_ld.go = FALSE;
2025 cnd_reset(cnd_autostop_size);
2026 if (cnd_file_duration) {
2027 cnd_reset(cnd_file_duration);
2029 libpcap_dump_flush(global_ld.pdh, NULL);
2030 report_packet_count(inpkts_to_sync_pipe);
2031 inpkts_to_sync_pipe = 0;
2032 report_new_capture_file(capture_opts->save_file);
2034 /* File switch failed: stop here */
2035 global_ld.go = FALSE;
2039 /* single file, stop now */
2040 global_ld.go = FALSE;
2043 } /* cnd_autostop_size */
2044 if (capture_opts->output_to_pipe) {
2045 libpcap_dump_flush(global_ld.pdh, NULL);
2049 /* Only update once a second (Win32: 500ms) so as not to overload slow
2050 * displays. This also prevents too much context-switching between the
2051 * dumpcap and wireshark processes */
2052 cur_time = TIME_GET();
2054 if ( (cur_time - upd_time) > 500) {
2056 if (cur_time - upd_time > 0) {
2058 upd_time = cur_time;
2060 /*if (pcap_stats(pch, stats) >= 0) {
2061 *stats_known = TRUE;
2064 /* Let the parent process know. */
2065 if (inpkts_to_sync_pipe) {
2067 libpcap_dump_flush(global_ld.pdh, NULL);
2069 /* Send our parent a message saying we've written out "inpkts_to_sync_pipe"
2070 packets to the capture file. */
2071 report_packet_count(inpkts_to_sync_pipe);
2073 inpkts_to_sync_pipe = 0;
2076 /* check capture duration condition */
2077 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
2078 /* The maximum capture time has elapsed; stop the capture. */
2079 global_ld.go = FALSE;
2083 /* check capture file duration condition */
2084 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
2085 /* duration limit reached, do we have another file? */
2086 if (capture_opts->multi_files_on) {
2087 if (cnd_autostop_files != NULL &&
2088 cnd_eval(cnd_autostop_files, ++autostop_files)) {
2089 /* no files left: stop here */
2090 global_ld.go = FALSE;
2094 /* Switch to the next ringbuffer file */
2095 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2096 &save_file_fd, &global_ld.err)) {
2097 gboolean successful;
2099 /* file switch succeeded: reset the conditions */
2100 global_ld.bytes_written = 0;
2101 if (capture_opts->use_pcapng) {
2104 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2105 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &global_ld.bytes_written, &global_ld.err) &&
2106 libpcap_write_interface_description_block(global_ld.pdh, capture_opts->iface, capture_opts->cfilter, global_ld.linktype, global_ld.file_snaplen, &global_ld.bytes_written, &global_ld.err);
2108 successful = libpcap_write_file_header(global_ld.pdh, global_ld.linktype, global_ld.file_snaplen,
2109 &global_ld.bytes_written, &global_ld.err);
2112 fclose(global_ld.pdh);
2113 global_ld.pdh = NULL;
2114 global_ld.go = FALSE;
2117 cnd_reset(cnd_file_duration);
2118 if(cnd_autostop_size)
2119 cnd_reset(cnd_autostop_size);
2120 libpcap_dump_flush(global_ld.pdh, NULL);
2121 report_packet_count(inpkts_to_sync_pipe);
2122 inpkts_to_sync_pipe = 0;
2123 report_new_capture_file(capture_opts->save_file);
2125 /* File switch failed: stop here */
2126 global_ld.go = FALSE;
2130 /* single file, stop now */
2131 global_ld.go = FALSE;
2134 } /* cnd_file_duration */
2137 } /* while (global_ld.go) */
2139 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
2141 /* delete stop conditions */
2142 if (cnd_file_duration != NULL)
2143 cnd_delete(cnd_file_duration);
2144 if (cnd_autostop_files != NULL)
2145 cnd_delete(cnd_autostop_files);
2146 if (cnd_autostop_size != NULL)
2147 cnd_delete(cnd_autostop_size);
2148 if (cnd_autostop_duration != NULL)
2149 cnd_delete(cnd_autostop_duration);
2151 /* did we had a pcap (input) error? */
2152 if (global_ld.pcap_err) {
2153 /* On Linux, if an interface goes down while you're capturing on it,
2154 you'll get a "recvfrom: Network is down" error (ENETDOWN).
2155 (At least you will if strerror() doesn't show a local translation
2158 On FreeBSD and OS X, if a network adapter disappears while
2159 you're capturing on it, you'll get a "read: Device not configured"
2160 error (ENXIO). (See previous parenthetical note.)
2162 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
2164 These should *not* be reported to the Wireshark developers. */
2167 cap_err_str = pcap_geterr(global_ld.pcap_h);
2168 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
2169 strcmp(cap_err_str, "read: Device not configured") == 0 ||
2170 strcmp(cap_err_str, "read: I/O error") == 0) {
2171 report_capture_error("The network adapter on which the capture was being done "
2172 "is no longer running; the capture has stopped.",
2175 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
2177 report_capture_error(errmsg, please_report);
2180 else if (global_ld.from_cap_pipe && global_ld.cap_pipe_err == PIPERR)
2181 report_capture_error(errmsg, "");
2183 /* did we had an error while capturing? */
2184 if (global_ld.err == 0) {
2187 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
2188 global_ld.err, FALSE);
2189 report_capture_error(errmsg, please_report);
2193 if (capture_opts->saving_to_file) {
2194 /* close the wiretap (output) file */
2195 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
2199 /* there might be packets not yet notified to the parent */
2200 /* (do this after closing the file, so all packets are already flushed) */
2201 if(inpkts_to_sync_pipe) {
2202 report_packet_count(inpkts_to_sync_pipe);
2203 inpkts_to_sync_pipe = 0;
2206 /* If we've displayed a message about a write error, there's no point
2207 in displaying another message about an error on close. */
2208 if (!close_ok && write_ok) {
2209 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
2211 report_capture_error(errmsg, "");
2215 * XXX We exhibit different behaviour between normal mode and sync mode
2216 * when the pipe is stdin and not already at EOF. If we're a child, the
2217 * parent's stdin isn't closed, so if the user starts another capture,
2218 * cap_pipe_open_live() will very likely not see the expected magic bytes and
2219 * will say "Unrecognized libpcap format". On the other hand, in normal
2220 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
2223 /* get packet drop statistics from pcap */
2224 if(global_ld.pcap_h != NULL) {
2225 g_assert(!global_ld.from_cap_pipe);
2226 /* Get the capture statistics, so we know how many packets were
2228 if (pcap_stats(global_ld.pcap_h, stats) >= 0) {
2229 *stats_known = TRUE;
2230 /* Let the parent process know. */
2231 report_packet_drops(stats->ps_drop);
2233 g_snprintf(errmsg, sizeof(errmsg),
2234 "Can't get packet-drop statistics: %s",
2235 pcap_geterr(global_ld.pcap_h));
2236 report_capture_error(errmsg, please_report);
2240 /* close the input file (pcap or capture pipe) */
2241 capture_loop_close_input(&global_ld);
2243 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
2245 /* ok, if the write and the close were successful. */
2246 return write_ok && close_ok;
2249 if (capture_opts->multi_files_on) {
2250 /* cleanup ringbuffer */
2251 ringbuf_error_cleanup();
2253 /* We can't use the save file, and we have no FILE * for the stream
2254 to close in order to close it, so close the FD directly. */
2255 if(save_file_fd != -1) {
2256 ws_close(save_file_fd);
2259 /* We couldn't even start the capture, so get rid of the capture
2261 if(capture_opts->save_file != NULL) {
2262 ws_unlink(capture_opts->save_file);
2263 g_free(capture_opts->save_file);
2266 capture_opts->save_file = NULL;
2268 report_cfilter_error(capture_opts->cfilter, errmsg);
2270 report_capture_error(errmsg, secondary_errmsg);
2272 /* close the input file (pcap or cap_pipe) */
2273 capture_loop_close_input(&global_ld);
2275 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
2281 static void capture_loop_stop(void)
2283 #ifdef HAVE_PCAP_BREAKLOOP
2284 if(global_ld.pcap_h != NULL)
2285 pcap_breakloop(global_ld.pcap_h);
2287 global_ld.go = FALSE;
2292 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
2293 int err, gboolean is_close)
2298 g_snprintf(errmsg, errmsglen,
2299 "Not all the packets could be written to the file"
2300 " to which the capture was being saved\n"
2301 "(\"%s\") because there is no space left on the file system\n"
2302 "on which that file resides.",
2308 g_snprintf(errmsg, errmsglen,
2309 "Not all the packets could be written to the file"
2310 " to which the capture was being saved\n"
2311 "(\"%s\") because you are too close to, or over,"
2312 " your disk quota\n"
2313 "on the file system on which that file resides.",
2318 case WTAP_ERR_CANT_CLOSE:
2319 g_snprintf(errmsg, errmsglen,
2320 "The file to which the capture was being saved"
2321 " couldn't be closed for some unknown reason.");
2324 case WTAP_ERR_SHORT_WRITE:
2325 g_snprintf(errmsg, errmsglen,
2326 "Not all the packets could be written to the file"
2327 " to which the capture was being saved\n"
2334 g_snprintf(errmsg, errmsglen,
2335 "The file to which the capture was being saved\n"
2336 "(\"%s\") could not be closed: %s.",
2337 fname, wtap_strerror(err));
2339 g_snprintf(errmsg, errmsglen,
2340 "An error occurred while writing to the file"
2341 " to which the capture was being saved\n"
2343 fname, wtap_strerror(err));
2350 /* one packet was captured, process it */
2352 capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
2355 loop_data *ld = (void *) user;
2358 /* We may be called multiple times from pcap_dispatch(); if we've set
2359 the "stop capturing" flag, ignore this packet, as we're not
2360 supposed to be saving any more packets. */
2365 gboolean successful;
2366 /* We're supposed to write the packet to a file; do so.
2367 If this fails, set "ld->go" to FALSE, to stop the capture, and set
2368 "ld->err" to the error. */
2369 if (global_capture_opts.use_pcapng) {
2370 successful = libpcap_write_enhanced_packet_block(ld->pdh, phdr, 0, pd, &ld->bytes_written, &err);
2372 successful = libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err);
2379 /* if the user told us to stop after x packets, do we already have enough? */
2380 if ((ld->packet_max > 0) && (ld->packet_count >= ld->packet_max))
2389 /* And now our feature presentation... [ fade to music ] */
2391 main(int argc, char *argv[])
2394 extern char *optarg;
2395 gboolean arg_error = FALSE;
2400 struct sigaction action, oldaction;
2403 gboolean start_capture = TRUE;
2404 gboolean stats_known;
2405 struct pcap_stat stats;
2406 GLogLevelFlags log_flags;
2407 gboolean list_interfaces = FALSE;
2408 gboolean list_link_layer_types = FALSE;
2409 gboolean machine_readable = FALSE;
2410 gboolean print_statistics = FALSE;
2411 int status, run_once_args = 0;
2414 #ifdef HAVE_PCAP_REMOTE
2415 #define OPTSTRING_INIT "a:A:b:c:Df:hi:Lm:MnprSs:uvw:y:Z:"
2417 #define OPTSTRING_INIT "a:b:c:Df:hi:LMnpSs:vw:y:Z:"
2421 #define OPTSTRING_WIN32 "B:"
2423 #define OPTSTRING_WIN32 ""
2426 char optstring[sizeof(OPTSTRING_INIT) + sizeof(OPTSTRING_WIN32) - 1] =
2427 OPTSTRING_INIT OPTSTRING_WIN32;
2429 #ifdef DEBUG_CHILD_DUMPCAP
2430 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
2431 fprintf (stderr, "Unable to open debug log file !\n");
2436 /* Determine if dumpcap is being requested to run in a special */
2437 /* capture_child mode by going thru the command line args to see if */
2438 /* a -Z is present. (-Z is a hidden option). */
2439 /* The primary result of running in capture_child mode is that */
2440 /* all messages sent out on stderr are in a special type/len/string */
2441 /* format to allow message processing by type. */
2442 /* These messages include various 'status' messages which are sent */
2443 /* when an actual capture is in progress. Capture_child mode */
2444 /* would normally be requested by a parent process which invokes */
2445 /* dumpcap and obtains dumpcap stderr output via a pipe to which */
2446 /* dumpcap stderr has been redirected. */
2447 /* Capture_child mode needs to be determined immediately upon */
2448 /* startup so that any messages generated by dumpcap in this mode */
2449 /* (eg: during initialization) will be formatted properly. */
2451 for (i=1; i<argc; i++) {
2452 if (strcmp("-Z", argv[i]) == 0) {
2453 capture_child = TRUE;
2455 /* set output pipe to binary mode, to avoid ugly text conversions */
2456 _setmode(2, O_BINARY);
2461 /* The default_log_handler will use stdout, which makes trouble in */
2462 /* capture child mode, as it uses stdout for it's sync_pipe. */
2463 /* So: the filtering is done in the console_log_handler and not here.*/
2464 /* We set the log handlers right up front to make sure that any log */
2465 /* messages when running as child will be sent back to the parent */
2466 /* with the correct format. */
2470 G_LOG_LEVEL_CRITICAL|
2471 G_LOG_LEVEL_WARNING|
2472 G_LOG_LEVEL_MESSAGE|
2475 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
2477 g_log_set_handler(NULL,
2479 console_log_handler, NULL /* user_data */);
2480 g_log_set_handler(LOG_DOMAIN_MAIN,
2482 console_log_handler, NULL /* user_data */);
2483 g_log_set_handler(LOG_DOMAIN_CAPTURE,
2485 console_log_handler, NULL /* user_data */);
2486 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
2488 console_log_handler, NULL /* user_data */);
2491 /* Load wpcap if possible. Do this before collecting the run-time version information */
2494 /* ... and also load the packet.dll from wpcap */
2495 /* XXX - currently not required, may change later. */
2496 /*wpcap_packet_load();*/
2498 /* Start windows sockets */
2499 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
2501 /* Set handler for Ctrl+C key */
2502 SetConsoleCtrlHandler(capture_cleanup, TRUE);
2504 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
2506 action.sa_handler = capture_cleanup;
2507 action.sa_flags = 0;
2508 sigemptyset(&action.sa_mask);
2509 sigaction(SIGTERM, &action, NULL);
2510 sigaction(SIGINT, &action, NULL);
2511 sigaction(SIGHUP, NULL, &oldaction);
2512 if (oldaction.sa_handler == SIG_DFL)
2513 sigaction(SIGHUP, &action, NULL);
2516 /* ----------------------------------------------------------------- */
2517 /* Privilege and capability handling */
2519 /* 1. Running not as root or suid root; no special capabilities. */
2522 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
2525 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
2527 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
2528 /* capabilities; Drop all other capabilities; */
2529 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
2530 /* else: after pcap_open_live() in capture_loop_open_input() */
2531 /* drop all capabilities (NET_RAW and NET_ADMIN); */
2532 /* (Note: this means that the process, although logged in */
2533 /* as root, does not have various permissions such as the */
2534 /* ability to bypass file access permissions). */
2535 /* XXX: Should we just leave capabilities alone in this case */
2536 /* so that user gets expected effect that root can do */
2539 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
2541 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
2542 /* else: after pcap_open_live() in capture_loop_open_input() */
2543 /* drop suid root (set euid=ruid).(ie: keep suid until after */
2544 /* pcap_open_live). */
2546 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
2548 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
2549 /* capabilities; Drop all other capabilities; */
2550 /* Drop suid privileges (euid=ruid); */
2551 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
2552 /* else: after pcap_open_live() in capture_loop_open_input() */
2553 /* drop all capabilities (NET_RAW and NET_ADMIN). */
2555 /* XXX: For some Linux versions/distros with capabilities */
2556 /* a 'normal' process with any capabilities cannot be */
2557 /* 'killed' (signaled) from another (same uid) non-privileged */
2559 /* For example: If (non-suid) Wireshark forks a */
2560 /* child suid dumpcap which acts as described here (case 5), */
2561 /* Wireshark will be unable to kill (signal) the child */
2562 /* dumpcap process until the capabilities have been dropped */
2563 /* (after pcap_open_live()). */
2564 /* This behaviour will apparently be changed in the kernel */
2565 /* to allow the kill (signal) in this case. */
2566 /* See the following for details: */
2567 /* http://www.mail-archive.com/ [wrapped] */
2568 /* linux-security-module@vger.kernel.org/msg02913.html */
2570 /* It is therefore conceivable that if dumpcap somehow hangs */
2571 /* in pcap_open_live or before that wireshark will not */
2572 /* be able to stop dumpcap using a signal (USR1, TERM, etc). */
2573 /* In this case, exiting wireshark will kill the child */
2574 /* dumpcap process. */
2576 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
2577 /* capabilities; Using libcap. Note: capset cmd (which see) */
2578 /* used to assign capabilities to file. */
2580 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
2581 /* else: after pcap_open_live() in capture_loop_open_input() */
2582 /* drop all capabilities (NET_RAW and NET_ADMIN) */
2584 /* ToDo: -S (stats) should drop privileges/capabilities when no */
2585 /* longer required (similar to capture). */
2587 /* ----------------------------------------------------------------- */
2589 get_credential_info();
2592 /* If 'started with special privileges' (and using libcap) */
2593 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
2594 /* Set euid/egid = ruid/rgid to remove suid privileges */
2595 relinquish_privs_except_capture();
2598 /* Set the initial values in the capture options. This might be overwritten
2599 by the command line parameters. */
2600 capture_opts_init(&global_capture_opts, NULL);
2602 /* Default to capturing the entire packet. */
2603 global_capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
2605 /* We always save to a file - if no file was specified, we save to a
2607 global_capture_opts.saving_to_file = TRUE;
2608 global_capture_opts.has_ring_num_files = TRUE;
2610 /* Now get our args */
2611 while ((opt = getopt(argc, argv, optstring)) != -1) {
2613 case 'h': /* Print help and exit */
2617 case 'v': /* Show version and exit */
2619 GString *comp_info_str;
2620 GString *runtime_info_str;
2621 /* Assemble the compile-time version information string */
2622 comp_info_str = g_string_new("Compiled ");
2623 get_compiled_version_info(comp_info_str, NULL);
2625 /* Assemble the run-time version information string */
2626 runtime_info_str = g_string_new("Running ");
2627 get_runtime_version_info(runtime_info_str, NULL);
2628 show_version(comp_info_str, runtime_info_str);
2629 g_string_free(comp_info_str, TRUE);
2630 g_string_free(runtime_info_str, TRUE);
2634 /*** capture option specific ***/
2635 case 'a': /* autostop criteria */
2636 case 'b': /* Ringbuffer option */
2637 case 'c': /* Capture x packets */
2638 case 'f': /* capture filter */
2639 case 'i': /* Use interface x */
2640 case 'n': /* Use pcapng format */
2641 case 'p': /* Don't capture in promiscuous mode */
2642 case 's': /* Set the snapshot (capture) length */
2643 case 'w': /* Write to capture file x */
2644 case 'y': /* Set the pcap data link type */
2645 #ifdef HAVE_PCAP_REMOTE
2646 case 'u': /* Use UDP for data transfer */
2647 case 'r': /* Capture own RPCAP traffic too */
2648 case 'A': /* Authentication */
2650 #ifdef HAVE_PCAP_SETSAMPLING
2651 case 'm': /* Sampling */
2654 case 'B': /* Buffer size */
2656 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
2661 /*** hidden option: Wireshark child mode (using binary output messages) ***/
2663 capture_child = TRUE;
2665 /* set output pipe to binary mode, to avoid ugly text conversions */
2666 _setmode(2, O_BINARY);
2668 * optarg = the control ID, aka the PPID, currently used for the
2671 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
2672 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
2673 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
2674 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
2676 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
2677 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
2678 "Signal pipe: Unable to open %s. Dead parent?",
2686 /*** all non capture option specific ***/
2687 case 'D': /* Print a list of capture devices and exit */
2688 list_interfaces = TRUE;
2691 case 'L': /* Print list of link-layer types and exit */
2692 list_link_layer_types = TRUE;
2695 case 'S': /* Print interface statistics once a second */
2696 print_statistics = TRUE;
2699 case 'M': /* For -D and -L, print machine-readable output */
2700 machine_readable = TRUE;
2703 case '?': /* Bad flag - print usage message */
2704 cmdarg_err("Invalid Option: %s", argv[optind-1]);
2712 /* user specified file name as regular command-line argument */
2713 /* XXX - use it as the capture file name (or something else)? */
2720 * Extra command line arguments were specified; complain.
2721 * XXX - interpret as capture filter, as tcpdump and tshark do?
2723 cmdarg_err("Invalid argument: %s", argv[0]);
2732 if (run_once_args > 1) {
2733 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
2735 } else if (list_link_layer_types) {
2736 /* We're supposed to list the link-layer types for an interface;
2737 did the user also specify a capture file to be read? */
2738 /* No - did they specify a ring buffer option? */
2739 if (global_capture_opts.multi_files_on) {
2740 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
2744 /* No - was the ring buffer option specified and, if so, does it make
2746 if (global_capture_opts.multi_files_on) {
2747 /* Ring buffer works only under certain conditions:
2748 a) ring buffer does not work with temporary files;
2749 b) it makes no sense to enable the ring buffer if the maximum
2750 file size is set to "infinite". */
2751 if (global_capture_opts.save_file == NULL) {
2752 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
2753 global_capture_opts.multi_files_on = FALSE;
2755 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
2756 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
2757 /* XXX - this must be redesigned as the conditions changed */
2758 /* global_capture_opts.multi_files_on = FALSE;*/
2763 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
2764 /* cmdarg_err() already called .... */
2768 /* Let the user know what interface was chosen. */
2769 /* get_interface_descriptive_name() is not available! */
2770 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n", global_capture_opts.iface);
2772 if (list_interfaces) {
2773 status = capture_opts_list_interfaces(machine_readable);
2775 } else if (list_link_layer_types) {
2776 status = capture_opts_list_link_layer_types(&global_capture_opts, machine_readable);
2778 } else if (print_statistics) {
2779 status = print_statistics_loop(machine_readable);
2783 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
2784 capture_opts_trim_ring_num_files(&global_capture_opts);
2786 /* Now start the capture. */
2788 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
2792 /* capture failed */
2799 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
2800 const char *message, gpointer user_data _U_)
2807 /* ignore log message, if log_level isn't interesting */
2808 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
2809 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
2814 /* create a "timestamp" */
2816 today = localtime(&curr);
2818 switch(log_level & G_LOG_LEVEL_MASK) {
2819 case G_LOG_LEVEL_ERROR:
2822 case G_LOG_LEVEL_CRITICAL:
2825 case G_LOG_LEVEL_WARNING:
2828 case G_LOG_LEVEL_MESSAGE:
2831 case G_LOG_LEVEL_INFO:
2834 case G_LOG_LEVEL_DEBUG:
2838 fprintf(stderr, "unknown log_level %u\n", log_level);
2840 g_assert_not_reached();
2843 /* Generate the output message */
2844 if(log_level & G_LOG_LEVEL_MESSAGE) {
2845 /* normal user messages without additional infos */
2846 msg = g_strdup_printf("%s\n", message);
2848 /* info/debug messages with additional infos */
2849 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
2850 today->tm_hour, today->tm_min, today->tm_sec,
2851 log_domain != NULL ? log_domain : "",
2855 /* DEBUG & INFO msgs (if we're debugging today) */
2856 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
2857 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
2858 #ifdef DEBUG_DUMPCAP
2859 fprintf(stderr, "%s", msg);
2862 #ifdef DEBUG_CHILD_DUMPCAP
2863 fprintf(debug_log, "%s", msg);
2871 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
2872 /* to parent especially formatted if dumpcap running as child. */
2873 if (capture_child) {
2874 sync_pipe_errmsg_to_parent(2, msg, "");
2876 fprintf(stderr, "%s", msg);
2883 /****************************************************************************************************************/
2884 /* indication report routines */
2888 report_packet_count(int packet_count)
2890 char tmp[SP_DECISIZE+1+1];
2891 static int count = 0;
2894 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
2895 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
2896 pipe_write_block(2, SP_PACKET_COUNT, tmp);
2898 count += packet_count;
2899 fprintf(stderr, "\rPackets: %u ", count);
2900 /* stderr could be line buffered */
2906 report_new_capture_file(const char *filename)
2909 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
2910 pipe_write_block(2, SP_FILE, filename);
2912 fprintf(stderr, "File: %s\n", filename);
2913 /* stderr could be line buffered */
2919 report_cfilter_error(const char *cfilter, const char *errmsg)
2921 if (capture_child) {
2922 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
2923 pipe_write_block(2, SP_BAD_FILTER, errmsg);
2926 "Invalid capture filter: \"%s\"!\n"
2928 "That string isn't a valid capture filter (%s).\n"
2929 "See the User's Guide for a description of the capture filter syntax.\n",
2935 report_capture_error(const char *error_msg, const char *secondary_error_msg)
2938 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
2939 "Primary Error: %s", error_msg);
2940 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
2941 "Secondary Error: %s", secondary_error_msg);
2942 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
2944 fprintf(stderr, "%s\n%s\n", error_msg, secondary_error_msg);
2949 report_packet_drops(guint32 drops)
2951 char tmp[SP_DECISIZE+1+1];
2953 g_snprintf(tmp, sizeof(tmp), "%u", drops);
2956 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets dropped: %s", tmp);
2957 pipe_write_block(2, SP_DROPS, tmp);
2959 fprintf(stderr, "Packets dropped: %s\n", tmp);
2960 /* stderr could be line buffered */
2966 /****************************************************************************************************************/
2967 /* signal_pipe handling */
2972 signal_pipe_check_running(void)
2974 /* any news from our parent? -> just stop the capture */
2978 /* if we are running standalone, no check required */
2979 if(!capture_child) {
2983 if(!sig_pipe_name || !sig_pipe_handle) {
2984 /* This shouldn't happen */
2985 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
2986 "Signal pipe: No name or handle");
2991 * XXX - We should have the process ID of the parent (from the "-Z" flag)
2992 * at this point. Should we check to see if the parent is still alive,
2993 * e.g. by using OpenProcess?
2996 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
2998 if(!result || avail > 0) {
2999 /* peek failed or some bytes really available */
3000 /* (if not piping from stdin this would fail) */
3001 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3002 "Signal pipe: Stop capture: %s", sig_pipe_name);
3003 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
3004 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
3005 sig_pipe_handle, result, avail);
3008 /* pipe ok and no bytes available */