5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
65 #include "wsutil/wsgetopt.h"
73 # include <sys/prctl.h>
74 # include <sys/capability.h>
77 #include "ringbuffer.h"
78 #include "clopts_common.h"
79 #include "console_io.h"
80 #include "cmdarg_err.h"
81 #include "version_info.h"
83 #include "capture-pcap-util.h"
89 #include "capture-wpcap.h"
90 #include <wsutil/unicode-utils.h>
94 #include <sys/socket.h>
98 #ifdef NEED_INET_V6DEFS_H
99 # include "wsutil/inet_v6defs.h"
102 #include <wsutil/privileges.h>
104 #include "sync_pipe.h"
106 #include "capture_opts.h"
107 #include "capture_ifinfo.h"
108 #include "capture_sync.h"
110 #include "conditions.h"
111 #include "capture_stop_conditions.h"
113 #include "tempfile.h"
115 #include "wsutil/file_util.h"
118 * Get information about libpcap format from "wiretap/libpcap.h".
119 * XXX - can we just use pcap_open_offline() to read the pipe?
121 #include "wiretap/libpcap.h"
123 #define DEBUG_DUMPCAP
124 /**#define DEBUG_CHILD_DUMPCAP**/
128 #include <conio.h> /* _getch() */
132 #ifdef DEBUG_CHILD_DUMPCAP
133 FILE *debug_log; /* for logging debug messages to */
134 /* a file if DEBUG_CHILD_DUMPCAP */
142 static GAsyncQueue *pcap_queue;
143 static gint64 pcap_queue_bytes;
144 static gint64 pcap_queue_packets;
145 static gint64 pcap_queue_byte_limit = 1000000;
146 static gint64 pcap_queue_packet_limit = 1;
148 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
150 static gchar *sig_pipe_name = NULL;
151 static HANDLE sig_pipe_handle = NULL;
152 static gboolean signal_pipe_check_running(void);
156 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
157 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
160 /** Stop a low-level capture (stops the capture child). */
161 static void capture_loop_stop(void);
163 #if !defined (__linux__)
164 #ifndef HAVE_PCAP_BREAKLOOP
166 * We don't have pcap_breakloop(), which is the only way to ensure that
167 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
168 * won't, if the call to read the next packet or batch of packets is
169 * is interrupted by a signal on UN*X, just go back and try again to
172 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
173 * the signal handler, set a flag to stop capturing; however, without
174 * a guarantee of that sort, we can't guarantee that we'll stop capturing
175 * if the read will be retried and won't time out if no packets arrive.
177 * Therefore, on at least some platforms, we work around the lack of
178 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
179 * to wait for packets to arrive, so that we're probably going to be
180 * blocked in the select() when the signal arrives, and can just bail
181 * out of the loop at that point.
183 * However, we don't want to do that on BSD (because "select()" doesn't work
184 * correctly on BPF devices on at least some releases of some flavors of
185 * BSD), and we don't want to do it on Windows (because "select()" is
186 * something for sockets, not for arbitrary handles). (Note that "Windows"
187 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
188 * using WinPcap, not a UNIX libpcap.)
190 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
191 * on BSD times out even if no packets have arrived, so we'll eventually
192 * exit pcap_dispatch() with an indication that no packets have arrived,
193 * and will break out of the capture loop at that point.
195 * On Windows, we can't send a SIGINT to stop capturing, so none of this
196 * applies in any case.
198 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
199 * want to include it if it's not present on this platform, however.
201 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
202 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
204 # define MUST_DO_SELECT
205 # endif /* avoid select */
206 #endif /* HAVE_PCAP_BREAKLOOP */
208 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
209 * in pcap_dispatch(); on the other hand, select() works just fine there.
210 * Hence we use a select for that come what may.
212 #define MUST_DO_SELECT
215 /** init the capture filter */
218 INITFILTER_BAD_FILTER,
219 INITFILTER_OTHER_ERROR
220 } initfilter_status_t;
222 typedef struct _pcap_queue_element {
224 struct pcap_pkthdr phdr;
226 } pcap_queue_element;
228 typedef struct _pcap_options {
230 #ifdef MUST_DO_SELECT
231 int pcap_fd; /* pcap file descriptor */
238 /* capture pipe (unix only "input file") */
239 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
240 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
241 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
243 HANDLE cap_pipe_h; /* The handle of the capture pipe */
245 int cap_pipe_fd; /* the file descriptor of the capture pipe */
247 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
248 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
250 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
251 #endif /* USE_THREADS */
252 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
253 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
255 STATE_EXPECT_REC_HDR,
260 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
262 GMutex *cap_pipe_read_mtx;
263 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
267 typedef struct _loop_data {
269 gboolean go; /* TRUE as long as we're supposed to keep capturing */
270 int err; /* if non-zero, error seen while capturing */
271 gint packet_count; /* Number of packets we have already captured */
272 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
273 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
275 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
282 guint32 autostop_files;
286 * Standard secondary message for unexpected errors.
288 static const char please_report[] =
289 "Please report this to the Wireshark developers.\n"
290 "(This is not a crash; please do not report it as such.)";
293 * This needs to be static, so that the SIGINT handler can clear the "go"
296 static loop_data global_ld;
300 * Timeout, in milliseconds, for reads from the stream of captured packets
301 * from a capture device.
303 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
304 * 64-bit applications, with sub-second timeouts not to work. The bug is
305 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
307 #if defined(__APPLE__) && defined(__LP64__)
308 static gboolean need_timeout_workaround;
310 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
312 #define CAP_READ_TIMEOUT 250
316 * Timeout, in microseconds, for reads from the stream of captured packets
317 * from a pipe. Pipes don't have the same problem that BPF devices do
318 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
319 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
320 * of the offending versions of Snow Leopard.
322 * On Windows this value is converted to milliseconds and passed to
323 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
324 * will return immediately.
327 #define PIPE_READ_TIMEOUT 250000
329 #define PIPE_READ_TIMEOUT 100000
331 static const char *cap_pipe_err_str;
333 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
336 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
337 const char *message, gpointer user_data _U_);
339 /* capture related options */
340 static capture_options global_capture_opts;
341 static gboolean quiet = FALSE;
342 static gboolean use_threads = FALSE;
344 static void capture_loop_write_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
346 static void capture_loop_queue_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
348 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
349 int err, gboolean is_close);
351 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
353 static void report_new_capture_file(const char *filename);
354 static void report_packet_count(int packet_count);
355 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
356 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
357 static void report_cfilter_error(const char *cfilter, const char *errmsg);
359 #define MSG_MAX_LENGTH 4096
362 print_usage(gboolean print_ver)
369 "Dumpcap " VERSION "%s\n"
370 "Capture network packets and dump them into a libpcap file.\n"
371 "See http://www.wireshark.org for more information.\n",
372 wireshark_svnversion);
376 fprintf(output, "\nUsage: dumpcap [options] ...\n");
377 fprintf(output, "\n");
378 fprintf(output, "Capture interface:\n");
379 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
380 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
381 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
382 fprintf(output, " -p don't capture in promiscuous mode\n");
383 #ifdef HAVE_PCAP_CREATE
384 fprintf(output, " -I capture in monitor mode, if available\n");
386 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
387 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
389 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
390 fprintf(output, " -D print list of interfaces and exit\n");
391 fprintf(output, " -L print list of link-layer types of iface and exit\n");
392 #ifdef HAVE_BPF_IMAGE
393 fprintf(output, " -d print generated BPF code for capture filter\n");
395 fprintf(output, " -S print statistics for each interface once every second\n");
396 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
397 fprintf(output, "\n");
398 #ifdef HAVE_PCAP_REMOTE
399 fprintf(output, "\nRPCAP options:\n");
400 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
401 fprintf(output, " -u use UDP for RPCAP data transfer\n");
402 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
403 #ifdef HAVE_PCAP_SETSAMPLING
404 fprintf(output, " -m <sampling type> use packet sampling\n");
405 fprintf(output, " count:NUM - capture one packet of every NUM\n");
406 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
409 fprintf(output, "Stop conditions:\n");
410 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
411 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
412 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
413 fprintf(output, " files:NUM - stop after NUM files\n");
414 /*fprintf(output, "\n");*/
415 fprintf(output, "Output (files):\n");
416 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
417 fprintf(output, " -g enable group read access on the output file(s)\n");
418 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
419 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
420 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
421 fprintf(output, " -n use pcapng format instead of pcap\n");
422 /*fprintf(output, "\n");*/
423 fprintf(output, "Miscellaneous:\n");
424 fprintf(output, " -t use a separate thread per interface\n");
425 fprintf(output, " -q don't report packet capture counts\n");
426 fprintf(output, " -v print version information and exit\n");
427 fprintf(output, " -h display this help and exit\n");
428 fprintf(output, "\n");
429 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
430 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
431 fprintf(output, "\n");
432 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
436 show_version(GString *comp_info_str, GString *runtime_info_str)
439 "Dumpcap " VERSION "%s\n"
444 "See http://www.wireshark.org for more information.\n",
445 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
449 * Print to the standard error. This is a command-line tool, so there's
450 * no need to pop up a console.
453 vfprintf_stderr(const char *fmt, va_list ap)
455 vfprintf(stderr, fmt, ap);
459 fprintf_stderr(const char *fmt, ...)
464 vfprintf_stderr(fmt, ap);
469 * Report an error in command-line arguments.
472 cmdarg_err(const char *fmt, ...)
478 /* Generate a 'special format' message back to parent */
480 msg = g_strdup_vprintf(fmt, ap);
481 sync_pipe_errmsg_to_parent(2, msg, "");
486 fprintf(stderr, "dumpcap: ");
487 vfprintf(stderr, fmt, ap);
488 fprintf(stderr, "\n");
494 * Report additional information for an error in command-line arguments.
497 cmdarg_err_cont(const char *fmt, ...)
504 msg = g_strdup_vprintf(fmt, ap);
505 sync_pipe_errmsg_to_parent(2, msg, "");
510 vfprintf(stderr, fmt, ap);
511 fprintf(stderr, "\n");
518 #if 0 /* Set to enable capability debugging */
519 /* see 'man cap_to_text()' for explanation of output */
520 /* '=' means 'all= ' ie: no capabilities */
521 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
523 print_caps(const char *pfx) {
524 cap_t caps = cap_get_proc();
525 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
526 "%s: EUID: %d Capabilities: %s", pfx,
527 geteuid(), cap_to_text(caps, NULL));
530 print_caps(const char *pfx _U_) {
535 relinquish_all_capabilities(void)
537 /* Drop any and all capabilities this process may have. */
538 /* Allowed whether or not process has any privileges. */
539 cap_t caps = cap_init(); /* all capabilities initialized to off */
540 print_caps("Pre-clear");
541 if (cap_set_proc(caps)) {
542 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
544 print_caps("Post-clear");
550 open_capture_device(interface_options *interface_opts,
551 char (*open_err_str)[PCAP_ERRBUF_SIZE])
554 #ifdef HAVE_PCAP_CREATE
557 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
558 struct pcap_rmtauth auth;
561 /* Open the network interface to capture from it.
562 Some versions of libpcap may put warnings into the error buffer
563 if they succeed; to tell if that's happened, we have to clear
564 the error buffer, and check if it's still a null string. */
565 (*open_err_str)[0] = '\0';
566 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
568 * If we're opening a remote device, use pcap_open(); that's currently
569 * the only open routine that supports remote devices.
571 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
572 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
573 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
574 auth.username = interface_opts->auth_username;
575 auth.password = interface_opts->auth_password;
577 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
579 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
580 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
581 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
582 CAP_READ_TIMEOUT, &auth, *open_err_str);
587 * If we're not opening a remote device, use pcap_create() and
588 * pcap_activate() if we have them, so that we can set the buffer
589 * size, otherwise use pcap_open_live().
591 #ifdef HAVE_PCAP_CREATE
592 pcap_h = pcap_create(interface_opts->name, *open_err_str);
593 if (pcap_h != NULL) {
594 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
595 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
596 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
598 if (interface_opts->buffer_size > 1) {
599 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
601 if (interface_opts->monitor_mode)
602 pcap_set_rfmon(pcap_h, 1);
603 err = pcap_activate(pcap_h);
605 /* Failed to activate, set to NULL */
606 if (err == PCAP_ERROR)
607 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
609 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
615 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
616 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
621 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
622 /* to remove any suid privileges. */
623 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
624 /* (euid/egid have already previously been set to ruid/rgid. */
625 /* (See comment in main() for details) */
627 relinquish_special_privs_perm();
629 relinquish_all_capabilities();
636 get_capture_device_open_failure_messages(const char *open_err_str,
642 char *errmsg, size_t errmsg_len,
643 char *secondary_errmsg,
644 size_t secondary_errmsg_len)
646 const char *libpcap_warn;
647 static const char ppamsg[] = "can't find PPA for ";
649 /* If we got a "can't find PPA for X" message, warn the user (who
650 is running dumcap on HP-UX) that they don't have a version of
651 libpcap that properly handles HP-UX (libpcap 0.6.x and later
652 versions, which properly handle HP-UX, say "can't find /dev/dlpi
653 PPA for X" rather than "can't find PPA for X"). */
654 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
657 "You are running (T)Wireshark with a version of the libpcap library\n"
658 "that doesn't handle HP-UX network devices well; this means that\n"
659 "(T)Wireshark may not be able to capture packets.\n"
661 "To fix this, you should install libpcap 0.6.2, or a later version\n"
662 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
663 "packaged binary form from the Software Porting And Archive Centre\n"
664 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
665 "at the URL lists a number of mirror sites.";
668 g_snprintf(errmsg, (gulong) errmsg_len,
669 "The capture session could not be initiated (%s).", open_err_str);
671 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
672 "Please check to make sure you have sufficient permissions, and that you have "
673 "the proper interface or pipe specified.%s", libpcap_warn);
675 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
677 "Please check that \"%s\" is the proper interface.\n"
680 "Help can be found at:\n"
682 " http://wiki.wireshark.org/WinPcap\n"
683 " http://wiki.wireshark.org/CaptureSetup\n",
688 /* Set the data link type on a pcap. */
690 set_pcap_linktype(pcap_t *pcap_h, int linktype,
691 #ifdef HAVE_PCAP_SET_DATALINK
696 char *errmsg, size_t errmsg_len,
697 char *secondary_errmsg, size_t secondary_errmsg_len)
699 char *set_linktype_err_str;
702 return TRUE; /* just use the default */
703 #ifdef HAVE_PCAP_SET_DATALINK
704 if (pcap_set_datalink(pcap_h, linktype) == 0)
705 return TRUE; /* no error */
706 set_linktype_err_str = pcap_geterr(pcap_h);
708 /* Let them set it to the type it is; reject any other request. */
709 if (get_pcap_linktype(pcap_h, name) == linktype)
710 return TRUE; /* no error */
711 set_linktype_err_str =
712 "That DLT isn't one of the DLTs supported by this device";
714 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
715 set_linktype_err_str);
717 * If the error isn't "XXX is not one of the DLTs supported by this device",
718 * tell the user to tell the Wireshark developers about it.
720 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
721 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
723 secondary_errmsg[0] = '\0';
728 compile_capture_filter(const char *iface, pcap_t *pcap_h,
729 struct bpf_program *fcode, char *cfilter)
731 bpf_u_int32 netnum, netmask;
732 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
734 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
736 * Well, we can't get the netmask for this interface; it's used
737 * only for filters that check for broadcast IP addresses, so
738 * we just punt and use 0. It might be nice to warn the user,
739 * but that's a pain in a GUI application, as it'd involve popping
740 * up a message box, and it's not clear how often this would make
741 * a difference (only filters that check for IP broadcast addresses
745 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
748 if (pcap_compile(pcap_h, fcode, cfilter, 1, netmask) < 0)
753 #ifdef HAVE_BPF_IMAGE
755 show_filter_code(capture_options *capture_opts)
757 interface_options interface_opts;
759 gchar open_err_str[PCAP_ERRBUF_SIZE];
760 char errmsg[MSG_MAX_LENGTH+1];
761 char secondary_errmsg[MSG_MAX_LENGTH+1];
762 struct bpf_program fcode;
763 struct bpf_insn *insn;
767 for (j = 0; j < capture_opts->ifaces->len; j++) {
768 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
769 pcap_h = open_capture_device(&interface_opts, &open_err_str);
770 if (pcap_h == NULL) {
771 /* Open failed; get messages */
772 get_capture_device_open_failure_messages(open_err_str,
774 errmsg, sizeof errmsg,
776 sizeof secondary_errmsg);
777 /* And report them */
778 report_capture_error(errmsg, secondary_errmsg);
782 /* Set the link-layer type. */
783 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
784 errmsg, sizeof errmsg,
785 secondary_errmsg, sizeof secondary_errmsg)) {
787 report_capture_error(errmsg, secondary_errmsg);
791 /* OK, try to compile the capture filter. */
792 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
793 interface_opts.cfilter)) {
795 report_cfilter_error(interface_opts.cfilter, errmsg);
800 /* Now print the filter code. */
801 insn = fcode.bf_insns;
803 for (i = 0; i < fcode.bf_len; insn++, i++)
804 printf("%s\n", bpf_image(insn, i));
807 /* Let our parent know we succeeded. */
808 pipe_write_block(2, SP_SUCCESS, NULL);
815 * capture_interface_list() is expected to do the right thing to get
816 * a list of interfaces.
818 * In most of the programs in the Wireshark suite, "the right thing"
819 * is to run dumpcap and ask it for the list, because dumpcap may
820 * be the only program in the suite with enough privileges to get
823 * In dumpcap itself, however, we obviously can't run dumpcap to
824 * ask for the list. Therefore, our capture_interface_list() should
825 * just call get_interface_list().
828 capture_interface_list(int *err, char **err_str)
830 return get_interface_list(err, err_str);
834 * Get the data-link type for a libpcap device.
835 * This works around AIX 5.x's non-standard and incompatible-with-the-
836 * rest-of-the-universe libpcap.
839 get_pcap_linktype(pcap_t *pch, const char *devname
847 const char *ifacename;
850 linktype = pcap_datalink(pch);
854 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
855 * rather than DLT_ values for link-layer types; the ifType values
856 * for LAN devices are:
863 * and the ifType value for a loopback device is 24.
865 * The AIX names for LAN devices begin with:
872 * and the AIX names for loopback devices begin with "lo".
874 * (The difference between "Ethernet" and "802.3" is presumably
875 * whether packets have an Ethernet header, with a packet type,
876 * or an 802.3 header, with a packet length, followed by an 802.2
877 * header and possibly a SNAP header.)
879 * If the device name matches "linktype" interpreted as an ifType
880 * value, rather than as a DLT_ value, we will assume this is AIX's
881 * non-standard, incompatible libpcap, rather than a standard libpcap,
882 * and will map the link-layer type to the standard DLT_ value for
883 * that link-layer type, as that's what the rest of Wireshark expects.
885 * (This means the capture files won't be readable by a tcpdump
886 * linked with AIX's non-standard libpcap, but so it goes. They
887 * *will* be readable by standard versions of tcpdump, Wireshark,
890 * XXX - if we conclude we're using AIX libpcap, should we also
891 * set a flag to cause us to assume the time stamps are in
892 * seconds-and-nanoseconds form, and to convert them to
893 * seconds-and-microseconds form before processing them and
898 * Find the last component of the device name, which is the
901 ifacename = strchr(devname, '/');
902 if (ifacename == NULL)
905 /* See if it matches any of the LAN device names. */
906 if (strncmp(ifacename, "en", 2) == 0) {
909 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
913 } else if (strncmp(ifacename, "et", 2) == 0) {
916 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
917 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
922 } else if (strncmp(ifacename, "tr", 2) == 0) {
925 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
926 * DLT_IEEE802, which is what's used for Token Ring.
930 } else if (strncmp(ifacename, "fi", 2) == 0) {
931 if (linktype == 15) {
933 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
937 } else if (strncmp(ifacename, "lo", 2) == 0) {
938 if (linktype == 24) {
940 * That's the RFC 1573 value for "software loopback" devices; map it
941 * to DLT_NULL, which is what's used for loopback devices on BSD.
951 static data_link_info_t *
952 create_data_link_info(int dlt)
954 data_link_info_t *data_link_info;
957 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
958 data_link_info->dlt = dlt;
959 text = pcap_datalink_val_to_name(dlt);
961 data_link_info->name = g_strdup(text);
963 data_link_info->name = g_strdup_printf("DLT %d", dlt);
964 text = pcap_datalink_val_to_description(dlt);
966 data_link_info->description = g_strdup(text);
968 data_link_info->description = NULL;
969 return data_link_info;
973 * Get the capabilities of a network device.
975 static if_capabilities_t *
976 get_if_capabilities(const char *devname, gboolean monitor_mode
977 #ifndef HAVE_PCAP_CREATE
982 if_capabilities_t *caps;
983 char errbuf[PCAP_ERRBUF_SIZE];
985 #ifdef HAVE_PCAP_CREATE
989 #ifdef HAVE_PCAP_LIST_DATALINKS
993 data_link_info_t *data_link_info;
996 * Allocate the interface capabilities structure.
998 caps = g_malloc(sizeof *caps);
1000 #ifdef HAVE_PCAP_OPEN
1001 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1002 caps->can_set_rfmon = FALSE;
1004 if (err_str != NULL)
1005 *err_str = g_strdup(errbuf);
1009 #elif defined(HAVE_PCAP_CREATE)
1010 pch = pcap_create(devname, errbuf);
1012 if (err_str != NULL)
1013 *err_str = g_strdup(errbuf);
1017 status = pcap_can_set_rfmon(pch);
1020 if (status == PCAP_ERROR)
1021 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1024 *err_str = g_strdup(pcap_statustostr(status));
1030 caps->can_set_rfmon = FALSE;
1031 else if (status == 1) {
1032 caps->can_set_rfmon = TRUE;
1034 pcap_set_rfmon(pch, 1);
1036 if (err_str != NULL) {
1037 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1045 status = pcap_activate(pch);
1047 /* Error. We ignore warnings (status > 0). */
1048 if (err_str != NULL) {
1049 if (status == PCAP_ERROR)
1050 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1053 *err_str = g_strdup(pcap_statustostr(status));
1060 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1061 caps->can_set_rfmon = FALSE;
1063 if (err_str != NULL)
1064 *err_str = g_strdup(errbuf);
1069 deflt = get_pcap_linktype(pch, devname);
1070 #ifdef HAVE_PCAP_LIST_DATALINKS
1071 nlt = pcap_list_datalinks(pch, &linktypes);
1072 if (nlt == 0 || linktypes == NULL) {
1074 if (err_str != NULL)
1075 *err_str = NULL; /* an empty list doesn't mean an error */
1078 caps->data_link_types = NULL;
1079 for (i = 0; i < nlt; i++) {
1080 data_link_info = create_data_link_info(linktypes[i]);
1083 * XXX - for 802.11, make the most detailed 802.11
1084 * version the default, rather than the one the
1085 * device has as the default?
1087 if (linktypes[i] == deflt)
1088 caps->data_link_types = g_list_prepend(caps->data_link_types,
1091 caps->data_link_types = g_list_append(caps->data_link_types,
1094 #ifdef HAVE_PCAP_FREE_DATALINKS
1095 pcap_free_datalinks(linktypes);
1098 * In Windows, there's no guarantee that if you have a library
1099 * built with one version of the MSVC++ run-time library, and
1100 * it returns a pointer to allocated data, you can free that
1101 * data from a program linked with another version of the
1102 * MSVC++ run-time library.
1104 * This is not an issue on UN*X.
1106 * See the mail threads starting at
1108 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1112 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1115 #define xx_free free /* hack so checkAPIs doesn't complain */
1118 #endif /* HAVE_PCAP_FREE_DATALINKS */
1119 #else /* HAVE_PCAP_LIST_DATALINKS */
1121 data_link_info = create_data_link_info(deflt);
1122 caps->data_link_types = g_list_append(caps->data_link_types,
1124 #endif /* HAVE_PCAP_LIST_DATALINKS */
1128 if (err_str != NULL)
1133 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1135 print_machine_readable_interfaces(GList *if_list)
1142 char addr_str[ADDRSTRLEN];
1144 if (capture_child) {
1145 /* Let our parent know we succeeded. */
1146 pipe_write_block(2, SP_SUCCESS, NULL);
1149 i = 1; /* Interface id number */
1150 for (if_entry = g_list_first(if_list); if_entry != NULL;
1151 if_entry = g_list_next(if_entry)) {
1152 if_info = (if_info_t *)if_entry->data;
1153 printf("%d. %s", i++, if_info->name);
1156 * Print the contents of the if_entry struct in a parseable format.
1157 * Each if_entry element is tab-separated. Addresses are comma-
1160 /* XXX - Make sure our description doesn't contain a tab */
1161 if (if_info->description != NULL)
1162 printf("\t%s\t", if_info->description);
1166 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1167 addr = g_slist_next(addr)) {
1168 if (addr != g_slist_nth(if_info->addrs, 0))
1171 if_addr = (if_addr_t *)addr->data;
1172 switch(if_addr->ifat_type) {
1174 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1176 printf("%s", addr_str);
1178 printf("<unknown IPv4>");
1182 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1183 addr_str, ADDRSTRLEN)) {
1184 printf("%s", addr_str);
1186 printf("<unknown IPv6>");
1190 printf("<type unknown %u>", if_addr->ifat_type);
1194 if (if_info->loopback)
1195 printf("\tloopback");
1197 printf("\tnetwork");
1204 * If you change the machine-readable output format of this function,
1205 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1208 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1211 data_link_info_t *data_link_info;
1212 const gchar *desc_str;
1214 if (capture_child) {
1215 /* Let our parent know we succeeded. */
1216 pipe_write_block(2, SP_SUCCESS, NULL);
1219 if (caps->can_set_rfmon)
1223 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1224 lt_entry = g_list_next(lt_entry)) {
1225 data_link_info = (data_link_info_t *)lt_entry->data;
1226 if (data_link_info->description != NULL)
1227 desc_str = data_link_info->description;
1229 desc_str = "(not supported)";
1230 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1240 /* Print the number of packets captured for each interface until we're killed. */
1242 print_statistics_loop(gboolean machine_readable)
1244 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1250 char errbuf[PCAP_ERRBUF_SIZE];
1251 struct pcap_stat ps;
1253 if_list = get_interface_list(&err, &err_str);
1254 if (if_list == NULL) {
1256 case CANT_GET_INTERFACE_LIST:
1257 cmdarg_err("%s", err_str);
1261 case NO_INTERFACES_FOUND:
1262 cmdarg_err("There are no interfaces on which a capture can be done");
1268 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1269 if_info = (if_info_t *)if_entry->data;
1270 #ifdef HAVE_PCAP_OPEN
1271 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1273 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1277 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1278 if_stat->name = g_strdup(if_info->name);
1280 stat_list = g_list_append(stat_list, if_stat);
1285 cmdarg_err("There are no interfaces on which a capture can be done");
1289 if (capture_child) {
1290 /* Let our parent know we succeeded. */
1291 pipe_write_block(2, SP_SUCCESS, NULL);
1294 if (!machine_readable) {
1295 printf("%-15s %10s %10s\n", "Interface", "Received",
1299 global_ld.go = TRUE;
1300 while (global_ld.go) {
1301 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1302 if_stat = (if_stat_t *)stat_entry->data;
1303 pcap_stats(if_stat->pch, &ps);
1305 if (!machine_readable) {
1306 printf("%-15s %10u %10u\n", if_stat->name,
1307 ps.ps_recv, ps.ps_drop);
1309 printf("%s\t%u\t%u\n", if_stat->name,
1310 ps.ps_recv, ps.ps_drop);
1321 /* XXX - Not reached. Should we look for 'q' in stdin? */
1322 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1323 if_stat = (if_stat_t *)stat_entry->data;
1324 pcap_close(if_stat->pch);
1325 g_free(if_stat->name);
1328 g_list_free(stat_list);
1329 free_interface_list(if_list);
1337 capture_cleanup_handler(DWORD dwCtrlType)
1339 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1340 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1341 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1342 like SIGTERM at least when the machine's shutting down.
1344 For now, if we're running as a command rather than a capture child,
1345 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1346 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1347 in that way on UN*X.
1349 If we're not running as a capture child, we might be running as
1350 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1351 user logs out. (XXX - can we explicitly check whether we're
1352 running as a service?) */
1354 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1355 "Console: Control signal");
1356 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1357 "Console: Control signal, CtrlType: %u", dwCtrlType);
1359 /* Keep capture running if we're a service and a user logs off */
1360 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1361 capture_loop_stop();
1369 capture_cleanup_handler(int signum _U_)
1371 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1372 SIGTERM. We assume that if the user wanted it to keep running
1373 after they logged out, they'd have nohupped it. */
1375 /* Note: don't call g_log() in the signal handler: if we happened to be in
1376 * g_log() in process context when the signal came in, g_log will detect
1377 * the "recursion" and abort.
1380 capture_loop_stop();
1386 report_capture_count(void)
1388 /* Don't print this if we're a capture child. */
1389 if (!capture_child) {
1391 /* Report the count only if we aren't printing a packet count
1392 as packets arrive. */
1393 fprintf(stderr, "Packets captured: %u\n", global_ld.packet_count);
1394 /* stderr could be line buffered */
1403 report_counts_for_siginfo(void)
1405 report_capture_count();
1406 infoprint = FALSE; /* we just reported it */
1410 report_counts_siginfo(int signum _U_)
1412 int sav_errno = errno;
1414 /* If we've been told to delay printing, just set a flag asking
1415 that we print counts (if we're supposed to), otherwise print
1416 the count of packets captured (if we're supposed to). */
1420 report_counts_for_siginfo();
1423 #endif /* SIGINFO */
1426 exit_main(int status)
1429 /* Shutdown windows sockets */
1432 /* can be helpful for debugging */
1433 #ifdef DEBUG_DUMPCAP
1434 printf("Press any key\n");
1445 * If we were linked with libcap (not libpcap), make sure we have
1446 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1447 * (See comment in main() for details)
1450 relinquish_privs_except_capture(void)
1452 /* If 'started_with_special_privs' (ie: suid) then enable for
1453 * ourself the NET_ADMIN and NET_RAW capabilities and then
1454 * drop our suid privileges.
1456 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1457 * stuff we don't need (and shouldn't have).
1458 * CAP_NET_RAW: Packet capture (raw sockets).
1461 if (started_with_special_privs()) {
1462 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1463 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1465 cap_t caps = cap_init(); /* all capabilities initialized to off */
1467 print_caps("Pre drop, pre set");
1469 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1470 cmdarg_err("prctl() fail return: %s", strerror(errno));
1473 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1474 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1476 if (cap_set_proc(caps)) {
1477 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1479 print_caps("Pre drop, post set");
1481 relinquish_special_privs_perm();
1483 print_caps("Post drop, pre set");
1484 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1485 if (cap_set_proc(caps)) {
1486 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1488 print_caps("Post drop, post set");
1494 #endif /* HAVE_LIBCAP */
1496 /* Take care of byte order in the libpcap headers read from pipes.
1497 * (function taken from wiretap/libpcap.c) */
1499 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1502 /* Byte-swap the record header fields. */
1503 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1504 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1505 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1506 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1509 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1510 swapped, in order to match the BPF header layout.
1512 Unfortunately, some files were, according to a comment in the "libpcap"
1513 source, written with version 2.3 in their headers but without the
1514 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1515 would make no sense - we assume that we need to swap them. */
1516 if (hdr->version_major == 2 &&
1517 (hdr->version_minor < 3 ||
1518 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1521 temp = rechdr->orig_len;
1522 rechdr->orig_len = rechdr->incl_len;
1523 rechdr->incl_len = temp;
1529 * Thread function that reads from a pipe and pushes the data
1530 * to the main application thread.
1533 * XXX Right now we use async queues for basic signaling. The main thread
1534 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1535 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1536 * Iff the read is successful cap_pipe_read pushes an item onto
1537 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1538 * the queues themselves (yet).
1540 * We might want to move some of the cap_pipe_dispatch logic here so that
1541 * we can let cap_pipe_read run independently, queuing up multiple reads
1542 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1544 static void *cap_pipe_read(void *arg)
1546 pcap_options *pcap_opts = (pcap_options *)arg;
1555 while (pcap_opts->cap_pipe_err == PIPOK) {
1556 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1557 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1559 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1561 /* If we try to use read() on a named pipe on Windows with partial
1562 * data it appears to return EOF.
1564 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1565 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1570 last_err = GetLastError();
1571 if (last_err == ERROR_MORE_DATA) {
1573 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1574 pcap_opts->cap_pipe_err = PIPEOF;
1578 pcap_opts->cap_pipe_err = PIPERR;
1581 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1582 pcap_opts->cap_pipe_err = PIPEOF;
1587 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1588 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1591 pcap_opts->cap_pipe_err = PIPEOF;
1595 pcap_opts->cap_pipe_err = PIPERR;
1604 pcap_opts->cap_pipe_bytes_read = bytes_read;
1605 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1606 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1608 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1612 #endif /* USE_THREADS */
1614 /* Provide select() functionality for a single file descriptor
1615 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1617 * Returns the same values as select. If an error is returned,
1618 * the string cap_pipe_err_str should be used instead of errno.
1621 cap_pipe_select(int pipe_fd)
1624 struct timeval timeout;
1627 cap_pipe_err_str = "Unknown error";
1630 FD_SET(pipe_fd, &rfds);
1632 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1633 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1635 sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1637 cap_pipe_err_str = strerror(errno);
1642 /* Mimic pcap_open_live() for pipe captures
1644 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1645 * open it, and read the header.
1647 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1648 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1650 cap_pipe_open_live(char *pipename,
1651 pcap_options *pcap_opts,
1652 struct pcap_hdr *hdr,
1653 char *errmsg, int errmsgl)
1656 ws_statb64 pipe_stat;
1657 struct sockaddr_un sa;
1668 unsigned int bytes_read;
1673 pcap_opts->cap_pipe_fd = -1;
1675 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1677 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1680 * XXX - this blocks until a pcap per-file header has been written to
1681 * the pipe, so it could block indefinitely.
1683 if (strcmp(pipename, "-") == 0) {
1685 fd = 0; /* read from stdin */
1687 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1691 if (ws_stat64(pipename, &pipe_stat) < 0) {
1692 if (errno == ENOENT || errno == ENOTDIR)
1693 pcap_opts->cap_pipe_err = PIPNEXIST;
1695 g_snprintf(errmsg, errmsgl,
1696 "The capture session could not be initiated "
1697 "due to error getting information on pipe/socket: %s", strerror(errno));
1698 pcap_opts->cap_pipe_err = PIPERR;
1702 if (S_ISFIFO(pipe_stat.st_mode)) {
1703 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1705 g_snprintf(errmsg, errmsgl,
1706 "The capture session could not be initiated "
1707 "due to error on pipe open: %s", strerror(errno));
1708 pcap_opts->cap_pipe_err = PIPERR;
1711 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1712 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1714 g_snprintf(errmsg, errmsgl,
1715 "The capture session could not be initiated "
1716 "due to error on socket create: %s", strerror(errno));
1717 pcap_opts->cap_pipe_err = PIPERR;
1720 sa.sun_family = AF_UNIX;
1722 * The Single UNIX Specification says:
1724 * The size of sun_path has intentionally been left undefined.
1725 * This is because different implementations use different sizes.
1726 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1727 * of 104. Since most implementations originate from BSD versions,
1728 * the size is typically in the range 92 to 108.
1730 * Applications should not assume a particular length for sun_path
1731 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1735 * The <sys/un.h> header shall define the sockaddr_un structure,
1736 * which shall include at least the following members:
1738 * sa_family_t sun_family Address family.
1739 * char sun_path[] Socket pathname.
1741 * so we assume that it's an array, with a specified size,
1742 * and that the size reflects the maximum path length.
1744 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1745 /* Path name too long */
1746 g_snprintf(errmsg, errmsgl,
1747 "The capture session coud not be initiated "
1748 "due to error on socket connect: Path name too long");
1749 pcap_opts->cap_pipe_err = PIPERR;
1752 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1754 g_snprintf(errmsg, errmsgl,
1755 "The capture session coud not be initiated "
1756 "due to error on socket connect: %s", strerror(errno));
1757 pcap_opts->cap_pipe_err = PIPERR;
1761 if (S_ISCHR(pipe_stat.st_mode)) {
1763 * Assume the user specified an interface on a system where
1764 * interfaces are in /dev. Pretend we haven't seen it.
1766 pcap_opts->cap_pipe_err = PIPNEXIST;
1769 g_snprintf(errmsg, errmsgl,
1770 "The capture session could not be initiated because\n"
1771 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1772 pcap_opts->cap_pipe_err = PIPERR;
1777 #define PIPE_STR "\\pipe\\"
1778 /* Under Windows, named pipes _must_ have the form
1779 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1781 pncopy = g_strdup(pipename);
1782 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1783 pos = strchr(pncopy + 3, '\\');
1784 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1791 g_snprintf(errmsg, errmsgl,
1792 "The capture session could not be initiated because\n"
1793 "\"%s\" is neither an interface nor a pipe", pipename);
1794 pcap_opts->cap_pipe_err = PIPNEXIST;
1798 /* Wait for the pipe to appear */
1800 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1801 OPEN_EXISTING, 0, NULL);
1803 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1806 if (GetLastError() != ERROR_PIPE_BUSY) {
1807 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1808 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1809 g_snprintf(errmsg, errmsgl,
1810 "The capture session on \"%s\" could not be started "
1811 "due to error on pipe open: %s (error %d)",
1812 pipename, utf_16to8(err_str), GetLastError());
1814 pcap_opts->cap_pipe_err = PIPERR;
1818 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1819 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1820 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1821 g_snprintf(errmsg, errmsgl,
1822 "The capture session on \"%s\" timed out during "
1823 "pipe open: %s (error %d)",
1824 pipename, utf_16to8(err_str), GetLastError());
1826 pcap_opts->cap_pipe_err = PIPERR;
1833 pcap_opts->from_cap_pipe = TRUE;
1836 /* read the pcap header */
1838 while (bytes_read < sizeof magic) {
1839 sel_ret = cap_pipe_select(fd);
1841 g_snprintf(errmsg, errmsgl,
1842 "Unexpected error from select: %s", strerror(errno));
1844 } else if (sel_ret > 0) {
1845 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1848 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1850 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1857 #else /* USE_THREADS */
1858 g_thread_create(&cap_pipe_read, &pcap_opts, FALSE, NULL);
1860 pcap_opts->cap_pipe_buf = (char *) &magic;
1861 pcap_opts->cap_pipe_bytes_read = 0;
1862 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1863 /* We don't have to worry about cap_pipe_read_mtx here */
1864 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1865 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1866 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1867 if (pcap_opts->cap_pipe_bytes_read == 0)
1868 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1870 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1875 #endif /* USE_THREADS */
1879 /* Host that wrote it has our byte order, and was running
1880 a program using either standard or ss990417 libpcap. */
1881 pcap_opts->cap_pipe_byte_swapped = FALSE;
1882 pcap_opts->cap_pipe_modified = FALSE;
1884 case PCAP_MODIFIED_MAGIC:
1885 /* Host that wrote it has our byte order, but was running
1886 a program using either ss990915 or ss991029 libpcap. */
1887 pcap_opts->cap_pipe_byte_swapped = FALSE;
1888 pcap_opts->cap_pipe_modified = TRUE;
1890 case PCAP_SWAPPED_MAGIC:
1891 /* Host that wrote it has a byte order opposite to ours,
1892 and was running a program using either standard or
1893 ss990417 libpcap. */
1894 pcap_opts->cap_pipe_byte_swapped = TRUE;
1895 pcap_opts->cap_pipe_modified = FALSE;
1897 case PCAP_SWAPPED_MODIFIED_MAGIC:
1898 /* Host that wrote it out has a byte order opposite to
1899 ours, and was running a program using either ss990915
1900 or ss991029 libpcap. */
1901 pcap_opts->cap_pipe_byte_swapped = TRUE;
1902 pcap_opts->cap_pipe_modified = TRUE;
1905 /* Not a "libpcap" type we know about. */
1906 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1911 /* Read the rest of the header */
1913 while (bytes_read < sizeof(struct pcap_hdr)) {
1914 sel_ret = cap_pipe_select(fd);
1916 g_snprintf(errmsg, errmsgl,
1917 "Unexpected error from select: %s", strerror(errno));
1919 } else if (sel_ret > 0) {
1920 b = read(fd, ((char *)hdr)+bytes_read,
1921 sizeof(struct pcap_hdr) - bytes_read);
1924 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1926 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1933 #else /* USE_THREADS */
1934 pcap_opts->cap_pipe_buf = (char *) hdr;
1935 pcap_opts->cap_pipe_bytes_read = 0;
1936 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1937 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1938 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1939 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1940 if (pcap_opts->cap_pipe_bytes_read == 0)
1941 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1943 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1947 #endif /* USE_THREADS */
1949 if (pcap_opts->cap_pipe_byte_swapped) {
1950 /* Byte-swap the header fields about which we care. */
1951 hdr->version_major = BSWAP16(hdr->version_major);
1952 hdr->version_minor = BSWAP16(hdr->version_minor);
1953 hdr->snaplen = BSWAP32(hdr->snaplen);
1954 hdr->network = BSWAP32(hdr->network);
1956 pcap_opts->linktype = hdr->network;
1958 if (hdr->version_major < 2) {
1959 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1963 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1964 pcap_opts->cap_pipe_err = PIPOK;
1966 pcap_opts->cap_pipe_fd = fd;
1971 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1972 pcap_opts->cap_pipe_err = PIPERR;
1975 pcap_opts->cap_pipe_fd = -1;
1982 /* We read one record from the pipe, take care of byte order in the record
1983 * header, write the record to the capture file, and update capture statistics. */
1985 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
1987 struct pcap_pkthdr phdr;
1988 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2000 #ifdef LOG_CAPTURE_VERBOSE
2001 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2004 switch (pcap_opts->cap_pipe_state) {
2006 case STATE_EXPECT_REC_HDR:
2008 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2011 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2012 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2013 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2014 pcap_opts->cap_pipe_bytes_read = 0;
2017 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2018 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2019 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2024 case STATE_READ_REC_HDR:
2026 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2027 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2030 result = PD_PIPE_EOF;
2032 result = PD_PIPE_ERR;
2035 pcap_opts->cap_pipe_bytes_read += b;
2036 #else /* USE_THREADS */
2037 g_get_current_time(&wait_time);
2038 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2039 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2040 if (pcap_opts->cap_pipe_err == PIPEOF) {
2041 result = PD_PIPE_EOF;
2043 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2044 result = PD_PIPE_ERR;
2050 #endif /* USE_THREADS */
2051 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2053 result = PD_REC_HDR_READ;
2056 case STATE_EXPECT_DATA:
2058 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2061 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2062 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2063 pcap_opts->cap_pipe_bytes_read = 0;
2066 pcap_opts->cap_pipe_buf = (char *) data;
2067 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2068 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2073 case STATE_READ_DATA:
2075 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2076 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2079 result = PD_PIPE_EOF;
2081 result = PD_PIPE_ERR;
2084 pcap_opts->cap_pipe_bytes_read += b;
2085 #else /* USE_THREADS */
2086 g_get_current_time(&wait_time);
2087 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2088 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2089 if (pcap_opts->cap_pipe_err == PIPEOF) {
2090 result = PD_PIPE_EOF;
2092 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2093 result = PD_PIPE_ERR;
2099 #endif /* USE_THREADS */
2100 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2102 result = PD_DATA_READ;
2106 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2109 } /* switch (ld->cap_pipe_state) */
2112 * We've now read as much data as we were expecting, so process it.
2116 case PD_REC_HDR_READ:
2117 /* We've read the header. Take care of byte order. */
2118 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2119 &pcap_opts->cap_pipe_rechdr.hdr);
2120 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2121 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2122 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2125 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2129 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2130 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2131 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2132 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2133 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2136 capture_loop_queue_packet_cb((u_char *)&pcap_opts->interface_id, &phdr, data);
2138 capture_loop_write_packet_cb((u_char *)&pcap_opts->interface_id, &phdr, data);
2140 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2144 pcap_opts->cap_pipe_err = PIPEOF;
2149 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2150 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2151 g_snprintf(errmsg, errmsgl,
2152 "Error reading from pipe: %s (error %d)",
2153 utf_16to8(err_str), GetLastError());
2156 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2164 pcap_opts->cap_pipe_err = PIPERR;
2165 /* Return here rather than inside the switch to prevent GCC warning */
2170 /** Open the capture input file (pcap or capture pipe).
2171 * Returns TRUE if it succeeds, FALSE otherwise. */
2173 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2174 char *errmsg, size_t errmsg_len,
2175 char *secondary_errmsg, size_t secondary_errmsg_len)
2177 gchar open_err_str[PCAP_ERRBUF_SIZE];
2178 gchar *sync_msg_str;
2179 interface_options interface_opts;
2180 pcap_options pcap_opts;
2184 gchar *sync_secondary_msg_str;
2185 WORD wVersionRequested;
2189 /* XXX - opening Winsock on tshark? */
2191 /* Initialize Windows Socket if we are in a WIN32 OS
2192 This needs to be done before querying the interface for network/netmask */
2194 /* XXX - do we really require 1.1 or earlier?
2195 Are there any versions that support only 2.0 or higher? */
2196 wVersionRequested = MAKEWORD(1, 1);
2197 err = WSAStartup(wVersionRequested, &wsaData);
2201 case WSASYSNOTREADY:
2202 g_snprintf(errmsg, (gulong) errmsg_len,
2203 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2206 case WSAVERNOTSUPPORTED:
2207 g_snprintf(errmsg, (gulong) errmsg_len,
2208 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2209 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2212 case WSAEINPROGRESS:
2213 g_snprintf(errmsg, (gulong) errmsg_len,
2214 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2218 g_snprintf(errmsg, (gulong) errmsg_len,
2219 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2223 g_snprintf(errmsg, (gulong) errmsg_len,
2224 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2228 g_snprintf(errmsg, (gulong) errmsg_len,
2229 "Couldn't initialize Windows Sockets: error %d", err);
2232 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2236 if ((use_threads == FALSE) &&
2237 (capture_opts->ifaces->len > 1)) {
2238 g_snprintf(errmsg, (gulong) errmsg_len,
2239 "Using threads is required for capturing on mulitple interfaces! Use the -t option.");
2243 for (i = 0; i < capture_opts->ifaces->len; i++) {
2244 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2245 pcap_opts.pcap_h = NULL;
2246 #ifdef MUST_DO_SELECT
2247 pcap_opts.pcap_fd = -1;
2249 pcap_opts.pcap_err = FALSE;
2250 pcap_opts.interface_id = i;
2251 pcap_opts.tid = NULL;
2252 pcap_opts.snaplen = 0;
2253 pcap_opts.linktype = -1;
2254 pcap_opts.from_cap_pipe = FALSE;
2255 memset(&pcap_opts.cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2256 memset(&pcap_opts.cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2258 pcap_opts.cap_pipe_h = INVALID_HANDLE_VALUE;
2260 pcap_opts.cap_pipe_fd = -1;
2262 pcap_opts.cap_pipe_modified = FALSE;
2263 pcap_opts.cap_pipe_byte_swapped = FALSE;
2265 pcap_opts.cap_pipe_buf = NULL;
2266 #endif /* USE_THREADS */
2267 pcap_opts.cap_pipe_bytes_to_read = 0;
2268 pcap_opts.cap_pipe_bytes_read = 0;
2269 pcap_opts.cap_pipe_state = 0;
2270 pcap_opts.cap_pipe_err = PIPOK;
2272 pcap_opts.cap_pipe_read_mtx = g_mutex_new();
2273 pcap_opts.cap_pipe_pending_q = g_async_queue_new();
2274 pcap_opts.cap_pipe_done_q = g_async_queue_new();
2277 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2278 pcap_opts.pcap_h = open_capture_device(&interface_opts, &open_err_str);
2280 if (pcap_opts.pcap_h != NULL) {
2281 /* we've opened "iface" as a network device */
2283 /* try to set the capture buffer size */
2284 if (interface_opts.buffer_size > 1 &&
2285 pcap_setbuff(pcap_opts.pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2286 sync_secondary_msg_str = g_strdup_printf(
2287 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2288 "the default of 1MB will be used.\n"
2290 "Nonetheless, the capture is started.\n",
2291 interface_opts.buffer_size);
2292 report_capture_error("Couldn't set the capture buffer size!",
2293 sync_secondary_msg_str);
2294 g_free(sync_secondary_msg_str);
2298 #if defined(HAVE_PCAP_SETSAMPLING)
2299 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2300 struct pcap_samp *samp;
2302 if ((samp = pcap_setsampling(pcap_opts.pcap_h)) != NULL) {
2303 switch (interface_opts.sampling_method) {
2304 case CAPTURE_SAMP_BY_COUNT:
2305 samp->method = PCAP_SAMP_1_EVERY_N;
2308 case CAPTURE_SAMP_BY_TIMER:
2309 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2313 sync_msg_str = g_strdup_printf(
2314 "Unknown sampling method %d specified,\n"
2315 "continue without packet sampling",
2316 interface_opts.sampling_method);
2317 report_capture_error("Couldn't set the capture "
2318 "sampling", sync_msg_str);
2319 g_free(sync_msg_str);
2321 samp->value = interface_opts.sampling_param;
2323 report_capture_error("Couldn't set the capture sampling",
2324 "Cannot get packet sampling data structure");
2330 /* setting the data link type only works on real interfaces */
2331 if (!set_pcap_linktype(pcap_opts.pcap_h, interface_opts.linktype, interface_opts.name,
2333 secondary_errmsg, secondary_errmsg_len)) {
2334 g_array_append_val(ld->pcaps, pcap_opts);
2337 pcap_opts.linktype = get_pcap_linktype(pcap_opts.pcap_h, interface_opts.name);
2339 /* We couldn't open "iface" as a network device. */
2340 /* Try to open it as a pipe */
2341 cap_pipe_open_live(interface_opts.name, &pcap_opts, &pcap_opts.cap_pipe_hdr, errmsg, (int) errmsg_len);
2344 if (pcap_opts.cap_pipe_fd == -1) {
2346 if (pcap_opts.cap_pipe_h == INVALID_HANDLE_VALUE) {
2348 if (pcap_opts.cap_pipe_err == PIPNEXIST) {
2349 /* Pipe doesn't exist, so output message for interface */
2350 get_capture_device_open_failure_messages(open_err_str,
2351 interface_opts.name,
2355 secondary_errmsg_len);
2358 * Else pipe (or file) does exist and cap_pipe_open_live() has
2361 g_array_append_val(ld->pcaps, pcap_opts);
2364 /* cap_pipe_open_live() succeeded; don't want
2365 error message from pcap_open_live() */
2366 open_err_str[0] = '\0';
2370 /* XXX - will this work for tshark? */
2371 #ifdef MUST_DO_SELECT
2372 if (!pcap_opts.from_cap_pipe) {
2373 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2374 pcap_opts.pcap_fd = pcap_get_selectable_fd(pcap_opts.pcap_h);
2376 pcap_opts.pcap_fd = pcap_fileno(pcap_opts.pcap_h);
2381 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2382 returned a warning; print it, but keep capturing. */
2383 if (open_err_str[0] != '\0') {
2384 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2385 report_capture_error(sync_msg_str, "");
2386 g_free(sync_msg_str);
2388 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2389 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2390 g_array_append_val(ld->pcaps, pcap_opts);
2396 /* close the capture input file (pcap or capture pipe) */
2397 static void capture_loop_close_input(loop_data *ld)
2400 pcap_options pcap_opts;
2402 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2404 for (i = 0; i < ld->pcaps->len; i++) {
2405 pcap_opts = g_array_index(ld->pcaps, pcap_options, i);
2406 /* if open, close the capture pipe "input file" */
2408 if (pcap_opts.cap_pipe_fd >= 0) {
2409 g_assert(pcap_opts.from_cap_pipe);
2410 ws_close(pcap_opts.cap_pipe_fd);
2411 pcap_opts.cap_pipe_fd = -1;
2414 if (pcap_opts.cap_pipe_h != INVALID_HANDLE_VALUE) {
2415 CloseHandle(pcap_opts.cap_pipe_h);
2416 pcap_opts.cap_pipe_h = INVALID_HANDLE_VALUE;
2419 /* if open, close the pcap "input file" */
2420 if (pcap_opts.pcap_h != NULL) {
2421 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", pcap_opts.pcap_h);
2422 pcap_close(pcap_opts.pcap_h);
2423 pcap_opts.pcap_h = NULL;
2430 /* Shut down windows sockets */
2436 /* init the capture filter */
2437 static initfilter_status_t
2438 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2439 gchar * name, gchar * cfilter)
2441 struct bpf_program fcode;
2443 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2445 /* capture filters only work on real interfaces */
2446 if (cfilter && !from_cap_pipe) {
2447 /* A capture filter was specified; set it up. */
2448 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2449 /* Treat this specially - our caller might try to compile this
2450 as a display filter and, if that succeeds, warn the user that
2451 the display and capture filter syntaxes are different. */
2452 return INITFILTER_BAD_FILTER;
2454 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2455 #ifdef HAVE_PCAP_FREECODE
2456 pcap_freecode(&fcode);
2458 return INITFILTER_OTHER_ERROR;
2460 #ifdef HAVE_PCAP_FREECODE
2461 pcap_freecode(&fcode);
2465 return INITFILTER_NO_ERROR;
2469 /* set up to write to the already-opened capture output file/files */
2471 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2475 pcap_options pcap_opts;
2476 interface_options interface_opts;
2477 gboolean successful;
2479 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2481 if ((capture_opts->use_pcapng == FALSE) &&
2482 (capture_opts->ifaces->len > 1)) {
2483 g_snprintf(errmsg, errmsg_len,
2484 "Using PCAPNG is required for capturing on mulitple interfaces! Use the -n option.");
2488 /* Set up to write to the capture file. */
2489 if (capture_opts->multi_files_on) {
2490 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2492 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2495 if (capture_opts->use_pcapng) {
2498 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2499 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err);
2500 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2501 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2502 pcap_opts = g_array_index(ld->pcaps, pcap_options, i);
2503 if (pcap_opts.from_cap_pipe) {
2504 pcap_opts.snaplen = pcap_opts.cap_pipe_hdr.snaplen;
2506 pcap_opts.snaplen = pcap_snapshot(pcap_opts.pcap_h);
2508 successful = libpcap_write_interface_description_block(ld->pdh,
2509 interface_opts.name,
2510 interface_opts.cfilter,
2517 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2518 pcap_opts = g_array_index(ld->pcaps, pcap_options, 0);
2519 if (pcap_opts.from_cap_pipe) {
2520 pcap_opts.snaplen = pcap_opts.cap_pipe_hdr.snaplen;
2522 pcap_opts.snaplen = pcap_snapshot(pcap_opts.pcap_h);
2524 successful = libpcap_write_file_header(ld->pdh, pcap_opts.linktype, pcap_opts.snaplen,
2525 &ld->bytes_written, &err);
2533 if (ld->pdh == NULL) {
2534 /* We couldn't set up to write to the capture file. */
2535 /* XXX - use cf_open_error_message from tshark instead? */
2540 g_snprintf(errmsg, errmsg_len,
2541 "The file to which the capture would be"
2542 " saved (\"%s\") could not be opened: Error %d.",
2543 capture_opts->save_file, err);
2545 g_snprintf(errmsg, errmsg_len,
2546 "The file to which the capture would be"
2547 " saved (\"%s\") could not be opened: %s.",
2548 capture_opts->save_file, strerror(err));
2560 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2564 pcap_options pcap_opts;
2566 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2568 if (capture_opts->multi_files_on) {
2569 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2571 if (capture_opts->use_pcapng) {
2572 for (i = 0; i < global_ld.pcaps->len; i++) {
2573 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2574 if (!pcap_opts.from_cap_pipe) {
2575 libpcap_write_interface_statistics_block(ld->pdh, i, pcap_opts.pcap_h, &ld->bytes_written, err_close);
2579 return libpcap_dump_close(ld->pdh, err_close);
2583 /* dispatch incoming packets (pcap or capture pipe)
2585 * Waits for incoming packets to be available, and calls pcap_dispatch()
2586 * to cause them to be processed.
2588 * Returns the number of packets which were processed.
2590 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2591 * packet-batching behaviour does not cause packets to get held back
2595 capture_loop_dispatch(loop_data *ld,
2596 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2599 gint packet_count_before;
2600 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2605 packet_count_before = ld->packet_count;
2606 if (pcap_opts->from_cap_pipe) {
2607 /* dispatch from capture pipe */
2608 #ifdef LOG_CAPTURE_VERBOSE
2609 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2612 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2614 if (sel_ret < 0 && errno != EINTR) {
2615 g_snprintf(errmsg, errmsg_len,
2616 "Unexpected error from select: %s", strerror(errno));
2617 report_capture_error(errmsg, please_report);
2622 * "select()" says we can read from the pipe without blocking
2624 #endif /* USE_THREADS */
2625 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2635 /* dispatch from pcap */
2636 #ifdef MUST_DO_SELECT
2638 * If we have "pcap_get_selectable_fd()", we use it to get the
2639 * descriptor on which to select; if that's -1, it means there
2640 * is no descriptor on which you can do a "select()" (perhaps
2641 * because you're capturing on a special device, and that device's
2642 * driver unfortunately doesn't support "select()", in which case
2643 * we don't do the select - which means it might not be possible
2644 * to stop a capture until a packet arrives. If that's unacceptable,
2645 * plead with whoever supplies the software for that device to add
2646 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2647 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2648 * later, so it can use pcap_breakloop().
2650 #ifdef LOG_CAPTURE_VERBOSE
2651 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2653 if (pcap_opts->pcap_fd != -1) {
2654 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2657 * "select()" says we can read from it without blocking; go for
2660 * We don't have pcap_breakloop(), so we only process one packet
2661 * per pcap_dispatch() call, to allow a signal to stop the
2662 * processing immediately, rather than processing all packets
2663 * in a batch before quitting.
2666 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb,
2667 (u_char *)&(pcap_opts->interface_id));
2669 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb,
2670 (u_char *)&(pcap_opts->interface_id));
2674 /* Error, rather than pcap_breakloop(). */
2675 pcap_opts->pcap_err = TRUE;
2677 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2680 if (sel_ret < 0 && errno != EINTR) {
2681 g_snprintf(errmsg, errmsg_len,
2682 "Unexpected error from select: %s", strerror(errno));
2683 report_capture_error(errmsg, please_report);
2689 #endif /* MUST_DO_SELECT */
2691 /* dispatch from pcap without select */
2693 #ifdef LOG_CAPTURE_VERBOSE
2694 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2698 * On Windows, we don't support asynchronously telling a process to
2699 * stop capturing; instead, we check for an indication on a pipe
2700 * after processing packets. We therefore process only one packet
2701 * at a time, so that we can check the pipe after every packet.
2704 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)&pcap_opts->interface_id);
2706 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)&pcap_opts->interface_id);
2710 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)&pcap_opts->interface_id);
2712 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)&pcap_opts->interface_id);
2717 /* Error, rather than pcap_breakloop(). */
2718 pcap_opts->pcap_err = TRUE;
2720 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2722 #else /* pcap_next_ex */
2723 #ifdef LOG_CAPTURE_VERBOSE
2724 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2726 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2729 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2730 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2731 * This should be fixed in the WinPcap 4.0 alpha release.
2733 * For reference, an example remote interface:
2734 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2737 /* emulate dispatch from pcap */
2740 struct pcap_pkthdr *pkt_header;
2745 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2747 capture_loop_queue_packet_cb((u_char *)&pcap_opts->interface_id, pkt_header, pkt_data);
2749 capture_loop_write_packet_cb((u_char *)&pcap_opts->interface_id, pkt_header, pkt_data);
2754 pcap_opts->pcap_err = TRUE;
2758 #endif /* pcap_next_ex */
2762 #ifdef LOG_CAPTURE_VERBOSE
2763 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2766 return ld->packet_count - packet_count_before;
2770 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2771 * want to grab only the characters between the '{' and '}' delimiters.
2773 * Returns a GString that must be freed with g_string_free(). */
2775 isolate_uuid(const char *iface)
2780 ptr = strchr(iface, '{');
2782 return g_string_new(iface);
2783 gstr = g_string_new(ptr + 1);
2785 ptr = strchr(gstr->str, '}');
2789 gstr = g_string_truncate(gstr, ptr - gstr->str);
2794 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2795 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2797 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2798 char *errmsg, int errmsg_len)
2801 gchar *capfile_name;
2803 gboolean is_tempfile;
2805 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2806 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2808 if (capture_opts->save_file != NULL) {
2809 /* We return to the caller while the capture is in progress.
2810 * Therefore we need to take a copy of save_file in
2811 * case the caller destroys it after we return.
2813 capfile_name = g_strdup(capture_opts->save_file);
2815 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2816 if (capture_opts->multi_files_on) {
2817 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2818 g_snprintf(errmsg, errmsg_len,
2819 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2820 g_free(capfile_name);
2823 if (strcmp(capfile_name, "-") == 0) {
2824 /* write to stdout */
2827 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2828 _setmode(1, O_BINARY);
2831 } /* if (...output_to_pipe ... */
2834 if (capture_opts->multi_files_on) {
2835 /* ringbuffer is enabled */
2836 *save_file_fd = ringbuf_init(capfile_name,
2837 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2838 capture_opts->group_read_access);
2840 /* we need the ringbuf name */
2841 if(*save_file_fd != -1) {
2842 g_free(capfile_name);
2843 capfile_name = g_strdup(ringbuf_current_filename());
2846 /* Try to open/create the specified file for use as a capture buffer. */
2847 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2848 (capture_opts->group_read_access) ? 0640 : 0600);
2851 is_tempfile = FALSE;
2853 /* Choose a random name for the temporary capture buffer */
2857 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1).name);
2858 prefix = g_strconcat("wireshark_", g_basename(iface->str), NULL);
2859 g_string_free(iface, TRUE);
2861 prefix = g_strconcat("wireshark_", g_basename(g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1).name), NULL);
2863 *save_file_fd = create_tempfile(&tmpname, prefix);
2865 capfile_name = g_strdup(tmpname);
2869 /* did we fail to open the output file? */
2870 if (*save_file_fd == -1) {
2872 g_snprintf(errmsg, errmsg_len,
2873 "The temporary file to which the capture would be saved (\"%s\") "
2874 "could not be opened: %s.", capfile_name, strerror(errno));
2876 if (capture_opts->multi_files_on) {
2877 ringbuf_error_cleanup();
2880 g_snprintf(errmsg, errmsg_len,
2881 "The file to which the capture would be saved (\"%s\") "
2882 "could not be opened: %s.", capfile_name,
2885 g_free(capfile_name);
2889 if(capture_opts->save_file != NULL) {
2890 g_free(capture_opts->save_file);
2892 capture_opts->save_file = capfile_name;
2893 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2894 "g_free(capfile_name)". */
2900 /* Do the work of handling either the file size or file duration capture
2901 conditions being reached, and switching files or stopping. */
2903 do_file_switch_or_stop(capture_options *capture_opts,
2904 condition *cnd_autostop_files,
2905 condition *cnd_autostop_size,
2906 condition *cnd_file_duration)
2909 pcap_options pcap_opts;
2910 interface_options interface_opts;
2911 gboolean successful;
2913 if (capture_opts->multi_files_on) {
2914 if (cnd_autostop_files != NULL &&
2915 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2916 /* no files left: stop here */
2917 global_ld.go = FALSE;
2921 /* Switch to the next ringbuffer file */
2922 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2923 &global_ld.save_file_fd, &global_ld.err)) {
2925 /* File switch succeeded: reset the conditions */
2926 global_ld.bytes_written = 0;
2927 if (capture_opts->use_pcapng) {
2930 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2931 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &(global_ld.bytes_written), &global_ld.err);
2932 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2933 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2934 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2935 successful = libpcap_write_interface_description_block(global_ld.pdh,
2936 interface_opts.name,
2937 interface_opts.cfilter,
2940 &(global_ld.bytes_written),
2944 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2945 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, 0);
2946 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts.linktype, pcap_opts.snaplen,
2947 &global_ld.bytes_written, &global_ld.err);
2950 fclose(global_ld.pdh);
2951 global_ld.pdh = NULL;
2952 global_ld.go = FALSE;
2955 if (cnd_autostop_size)
2956 cnd_reset(cnd_autostop_size);
2957 if (cnd_file_duration)
2958 cnd_reset(cnd_file_duration);
2959 libpcap_dump_flush(global_ld.pdh, NULL);
2961 report_packet_count(global_ld.inpkts_to_sync_pipe);
2962 global_ld.inpkts_to_sync_pipe = 0;
2963 report_new_capture_file(capture_opts->save_file);
2965 /* File switch failed: stop here */
2966 global_ld.go = FALSE;
2970 /* single file, stop now */
2971 global_ld.go = FALSE;
2978 pcap_read_handler(void* arg)
2980 pcap_options pcap_opts;
2982 char errmsg[MSG_MAX_LENGTH+1];
2984 interface_id = *(guint *)arg;
2986 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, interface_id);
2988 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
2991 while (global_ld.go) {
2992 /* dispatch incoming packets */
2993 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), &pcap_opts);
2995 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
2997 g_thread_exit(NULL);
3001 /* Do the low-level work of a capture.
3002 Returns TRUE if it succeeds, FALSE otherwise. */
3004 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3007 time_t upd_time, cur_time;
3009 struct timeval upd_time, cur_time;
3013 condition *cnd_file_duration = NULL;
3014 condition *cnd_autostop_files = NULL;
3015 condition *cnd_autostop_size = NULL;
3016 condition *cnd_autostop_duration = NULL;
3019 gboolean cfilter_error = FALSE;
3020 char errmsg[MSG_MAX_LENGTH+1];
3021 char secondary_errmsg[MSG_MAX_LENGTH+1];
3022 pcap_options pcap_opts;
3023 interface_options interface_opts;
3026 interface_opts = capture_opts->default_options;
3028 *secondary_errmsg = '\0';
3030 /* init the loop data */
3031 global_ld.go = TRUE;
3032 global_ld.packet_count = 0;
3034 global_ld.report_packet_count = FALSE;
3036 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options));
3037 if (capture_opts->has_autostop_packets)
3038 global_ld.packet_max = capture_opts->autostop_packets;
3040 global_ld.packet_max = 0; /* no limit */
3041 global_ld.inpkts_to_sync_pipe = 0;
3042 global_ld.err = 0; /* no error seen yet */
3043 global_ld.pdh = NULL;
3044 global_ld.autostop_files = 0;
3045 global_ld.save_file_fd = -1;
3047 /* We haven't yet gotten the capture statistics. */
3048 *stats_known = FALSE;
3050 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3051 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3053 /* open the "input file" from network interface or capture pipe */
3054 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3055 secondary_errmsg, sizeof(secondary_errmsg))) {
3058 for (i = 0; i < capture_opts->ifaces->len; i++) {
3059 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3060 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3061 /* init the input filter from the network interface (capture pipe will do nothing) */
3062 switch (capture_loop_init_filter(pcap_opts.pcap_h, pcap_opts.from_cap_pipe,
3063 interface_opts.name,
3064 interface_opts.cfilter)) {
3066 case INITFILTER_NO_ERROR:
3069 case INITFILTER_BAD_FILTER:
3070 cfilter_error = TRUE;
3071 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts.pcap_h));
3074 case INITFILTER_OTHER_ERROR:
3075 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3076 pcap_geterr(pcap_opts.pcap_h));
3077 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3082 /* If we're supposed to write to a capture file, open it for output
3083 (temporary/specified name/ringbuffer) */
3084 if (capture_opts->saving_to_file) {
3085 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3086 errmsg, sizeof(errmsg))) {
3090 /* set up to write to the already-opened capture output file/files */
3091 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3096 /* XXX - capture SIGTERM and close the capture, in case we're on a
3097 Linux 2.0[.x] system and you have to explicitly close the capture
3098 stream in order to turn promiscuous mode off? We need to do that
3099 in other places as well - and I don't think that works all the
3100 time in any case, due to libpcap bugs. */
3102 /* Well, we should be able to start capturing.
3104 Sync out the capture file, so the header makes it to the file system,
3105 and send a "capture started successfully and capture file created"
3106 message to our parent so that they'll open the capture file and
3107 update its windows to indicate that we have a live capture in
3109 libpcap_dump_flush(global_ld.pdh, NULL);
3110 report_new_capture_file(capture_opts->save_file);
3113 /* initialize capture stop (and alike) conditions */
3114 init_capture_stop_conditions();
3115 /* create stop conditions */
3116 if (capture_opts->has_autostop_filesize)
3118 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3119 if (capture_opts->has_autostop_duration)
3120 cnd_autostop_duration =
3121 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3123 if (capture_opts->multi_files_on) {
3124 if (capture_opts->has_file_duration)
3126 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3128 if (capture_opts->has_autostop_files)
3129 cnd_autostop_files =
3130 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3133 /* init the time values */
3135 upd_time = GetTickCount();
3137 gettimeofday(&upd_time, NULL);
3140 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3142 /* WOW, everything is prepared! */
3143 /* please fasten your seat belts, we will enter now the actual capture loop */
3145 pcap_queue = g_async_queue_new();
3146 pcap_queue_bytes = 0;
3147 pcap_queue_packets = 0;
3148 for (i = 0; i < global_ld.pcaps->len; i++) {
3151 interface_id = (gint *)g_malloc(sizeof(guint));
3153 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3154 pcap_opts.tid = g_thread_create(pcap_read_handler, interface_id, TRUE, NULL);
3155 global_ld.pcaps = g_array_remove_index(global_ld.pcaps, i);
3156 g_array_insert_val(global_ld.pcaps, i, pcap_opts);
3159 while (global_ld.go) {
3160 /* dispatch incoming packets */
3162 GTimeVal write_thread_time;
3163 pcap_queue_element *queue_element;
3165 g_get_current_time(&write_thread_time);
3166 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3167 g_async_queue_lock(pcap_queue);
3168 queue_element = g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3169 if (queue_element) {
3170 pcap_queue_bytes -= queue_element->phdr.caplen;
3171 pcap_queue_packets -= 1;
3173 g_async_queue_unlock(pcap_queue);
3174 if (queue_element) {
3175 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3176 "Dequeued a packet of length %d captured on interface %d.",
3177 queue_element->phdr.caplen, queue_element->interface_id);
3179 capture_loop_write_packet_cb((u_char *)&queue_element->interface_id,
3180 &queue_element->phdr,
3182 g_free(queue_element->pd);
3183 g_free(queue_element);
3189 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3190 sizeof(errmsg), &pcap_opts);
3193 /* Were we asked to print packet counts by the SIGINFO handler? */
3194 if (global_ld.report_packet_count) {
3195 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3196 plurality(global_ld.packet_count, "", "s"));
3197 global_ld.report_packet_count = FALSE;
3202 /* any news from our parent (signal pipe)? -> just stop the capture */
3203 if (!signal_pipe_check_running()) {
3204 global_ld.go = FALSE;
3209 global_ld.inpkts_to_sync_pipe += inpkts;
3211 /* check capture size condition */
3212 if (cnd_autostop_size != NULL &&
3213 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3214 /* Capture size limit reached, do we have another file? */
3215 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3216 cnd_autostop_size, cnd_file_duration))
3218 } /* cnd_autostop_size */
3219 if (capture_opts->output_to_pipe) {
3220 libpcap_dump_flush(global_ld.pdh, NULL);
3224 /* Only update once every 500ms so as not to overload slow displays.
3225 * This also prevents too much context-switching between the dumpcap
3226 * and wireshark processes.
3228 #define DUMPCAP_UPD_TIME 500
3231 cur_time = GetTickCount();
3232 if ( (cur_time - upd_time) > DUMPCAP_UPD_TIME) {
3234 gettimeofday(&cur_time, NULL);
3235 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3236 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3239 upd_time = cur_time;
3242 if (pcap_stats(pch, stats) >= 0) {
3243 *stats_known = TRUE;
3246 /* Let the parent process know. */
3247 if (global_ld.inpkts_to_sync_pipe) {
3249 libpcap_dump_flush(global_ld.pdh, NULL);
3251 /* Send our parent a message saying we've written out
3252 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3254 report_packet_count(global_ld.inpkts_to_sync_pipe);
3256 global_ld.inpkts_to_sync_pipe = 0;
3259 /* check capture duration condition */
3260 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3261 /* The maximum capture time has elapsed; stop the capture. */
3262 global_ld.go = FALSE;
3266 /* check capture file duration condition */
3267 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3268 /* duration limit reached, do we have another file? */
3269 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3270 cnd_autostop_size, cnd_file_duration))
3272 } /* cnd_file_duration */
3276 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3278 pcap_queue_element *queue_element;
3280 for (i = 0; i < global_ld.pcaps->len; i++) {
3281 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3282 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3283 pcap_opts.interface_id);
3284 g_thread_join(pcap_opts.tid);
3285 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3286 pcap_opts.interface_id);
3289 g_async_queue_lock(pcap_queue);
3290 queue_element = g_async_queue_try_pop_unlocked(pcap_queue);
3291 if (queue_element) {
3292 pcap_queue_bytes -= queue_element->phdr.caplen;
3293 pcap_queue_packets -= 1;
3295 g_async_queue_unlock(pcap_queue);
3296 if (queue_element == NULL) {
3299 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3300 "Dequeued a packet of length %d captured on interface %d.",
3301 queue_element->phdr.caplen, queue_element->interface_id);
3302 capture_loop_write_packet_cb((u_char *)&queue_element->interface_id,
3303 &queue_element->phdr,
3305 g_free(queue_element->pd);
3306 g_free(queue_element);
3307 global_ld.inpkts_to_sync_pipe += 1;
3308 if (capture_opts->output_to_pipe) {
3309 libpcap_dump_flush(global_ld.pdh, NULL);
3315 /* delete stop conditions */
3316 if (cnd_file_duration != NULL)
3317 cnd_delete(cnd_file_duration);
3318 if (cnd_autostop_files != NULL)
3319 cnd_delete(cnd_autostop_files);
3320 if (cnd_autostop_size != NULL)
3321 cnd_delete(cnd_autostop_size);
3322 if (cnd_autostop_duration != NULL)
3323 cnd_delete(cnd_autostop_duration);
3325 /* did we had a pcap (input) error? */
3326 for (i = 0; i < capture_opts->ifaces->len; i++) {
3327 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3328 if (pcap_opts.pcap_err) {
3329 /* On Linux, if an interface goes down while you're capturing on it,
3330 you'll get a "recvfrom: Network is down" or
3331 "The interface went down" error (ENETDOWN).
3332 (At least you will if strerror() doesn't show a local translation
3335 On FreeBSD and OS X, if a network adapter disappears while
3336 you're capturing on it, you'll get a "read: Device not configured"
3337 error (ENXIO). (See previous parenthetical note.)
3339 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3341 These should *not* be reported to the Wireshark developers. */
3344 cap_err_str = pcap_geterr(pcap_opts.pcap_h);
3345 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3346 strcmp(cap_err_str, "The interface went down") == 0 ||
3347 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3348 strcmp(cap_err_str, "read: I/O error") == 0 ||
3349 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3350 report_capture_error("The network adapter on which the capture was being done "
3351 "is no longer running; the capture has stopped.",
3354 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3356 report_capture_error(errmsg, please_report);
3359 } else if (pcap_opts.from_cap_pipe && pcap_opts.cap_pipe_err == PIPERR) {
3360 report_capture_error(errmsg, "");
3364 /* did we have an output error while capturing? */
3365 if (global_ld.err == 0) {
3368 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3369 global_ld.err, FALSE);
3370 report_capture_error(errmsg, please_report);
3374 if (capture_opts->saving_to_file) {
3375 /* close the output file */
3376 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3380 /* there might be packets not yet notified to the parent */
3381 /* (do this after closing the file, so all packets are already flushed) */
3382 if(global_ld.inpkts_to_sync_pipe) {
3384 report_packet_count(global_ld.inpkts_to_sync_pipe);
3385 global_ld.inpkts_to_sync_pipe = 0;
3388 /* If we've displayed a message about a write error, there's no point
3389 in displaying another message about an error on close. */
3390 if (!close_ok && write_ok) {
3391 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3393 report_capture_error(errmsg, "");
3397 * XXX We exhibit different behaviour between normal mode and sync mode
3398 * when the pipe is stdin and not already at EOF. If we're a child, the
3399 * parent's stdin isn't closed, so if the user starts another capture,
3400 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3401 * will say "Unrecognized libpcap format". On the other hand, in normal
3402 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3405 report_capture_count(); /* print final capture count only if (quiet && !capture_child) */
3407 /* get packet drop statistics from pcap */
3408 for (i = 0; i < capture_opts->ifaces->len; i++) {
3409 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3410 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3411 if (pcap_opts.pcap_h != NULL) {
3412 g_assert(!pcap_opts.from_cap_pipe);
3413 /* Get the capture statistics, so we know how many packets were dropped. */
3414 if (pcap_stats(pcap_opts.pcap_h, stats) >= 0) {
3415 *stats_known = TRUE;
3416 /* Let the parent process know. */
3417 report_packet_drops(stats->ps_recv, stats->ps_drop, interface_opts.name);
3419 g_snprintf(errmsg, sizeof(errmsg),
3420 "Can't get packet-drop statistics: %s",
3421 pcap_geterr(pcap_opts.pcap_h));
3422 report_capture_error(errmsg, please_report);
3427 /* close the input file (pcap or capture pipe) */
3428 capture_loop_close_input(&global_ld);
3430 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3432 /* ok, if the write and the close were successful. */
3433 return write_ok && close_ok;
3436 if (capture_opts->multi_files_on) {
3437 /* cleanup ringbuffer */
3438 ringbuf_error_cleanup();
3440 /* We can't use the save file, and we have no FILE * for the stream
3441 to close in order to close it, so close the FD directly. */
3442 if (global_ld.save_file_fd != -1) {
3443 ws_close(global_ld.save_file_fd);
3446 /* We couldn't even start the capture, so get rid of the capture
3448 if (capture_opts->save_file != NULL) {
3449 ws_unlink(capture_opts->save_file);
3450 g_free(capture_opts->save_file);
3453 capture_opts->save_file = NULL;
3455 report_cfilter_error(interface_opts.cfilter, errmsg);
3457 report_capture_error(errmsg, secondary_errmsg);
3459 /* close the input file (pcap or cap_pipe) */
3460 capture_loop_close_input(&global_ld);
3462 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3468 static void capture_loop_stop(void)
3470 #ifdef HAVE_PCAP_BREAKLOOP
3472 pcap_options pcap_opts;
3474 for (i = 0; i < global_ld.pcaps->len; i++) {
3475 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3476 if (pcap_opts.pcap_h != NULL)
3477 pcap_breakloop(pcap_opts.pcap_h);
3480 global_ld.go = FALSE;
3485 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3486 int err, gboolean is_close)
3491 g_snprintf(errmsg, errmsglen,
3492 "Not all the packets could be written to the file"
3493 " to which the capture was being saved\n"
3494 "(\"%s\") because there is no space left on the file system\n"
3495 "on which that file resides.",
3501 g_snprintf(errmsg, errmsglen,
3502 "Not all the packets could be written to the file"
3503 " to which the capture was being saved\n"
3504 "(\"%s\") because you are too close to, or over,"
3505 " your disk quota\n"
3506 "on the file system on which that file resides.",
3513 g_snprintf(errmsg, errmsglen,
3514 "The file to which the capture was being saved\n"
3515 "(\"%s\") could not be closed: %s.",
3516 fname, strerror(err));
3518 g_snprintf(errmsg, errmsglen,
3519 "An error occurred while writing to the file"
3520 " to which the capture was being saved\n"
3522 fname, strerror(err));
3529 /* one packet was captured, process it */
3531 capture_loop_write_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
3534 guint interface_id = *(guint *) (void *) user;
3537 /* We may be called multiple times from pcap_dispatch(); if we've set
3538 the "stop capturing" flag, ignore this packet, as we're not
3539 supposed to be saving any more packets. */
3543 if (global_ld.pdh) {
3544 gboolean successful;
3546 /* We're supposed to write the packet to a file; do so.
3547 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3548 "ld->err" to the error. */
3549 if (global_capture_opts.use_pcapng) {
3550 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, interface_id, pd, &global_ld.bytes_written, &err);
3552 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3555 global_ld.go = FALSE;
3556 global_ld.err = err;
3558 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3559 "Wrote a packet of length %d captured on interface %u.",
3560 phdr->caplen, interface_id);
3561 global_ld.packet_count++;
3562 /* if the user told us to stop after x packets, do we already have enough? */
3563 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3564 global_ld.go = FALSE;
3570 /* one packet was captured, queue it */
3572 capture_loop_queue_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
3575 pcap_queue_element *queue_element;
3577 gboolean limit_reached;
3579 /* We may be called multiple times from pcap_dispatch(); if we've set
3580 the "stop capturing" flag, ignore this packet, as we're not
3581 supposed to be saving any more packets. */
3585 interface_id = *(guint *) (void *) user;
3586 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3587 if (queue_element == NULL) {
3590 queue_element->interface_id = interface_id;
3591 queue_element->phdr = *phdr;
3592 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3593 if (queue_element->pd == NULL) {
3594 g_free(queue_element);
3597 memcpy(queue_element->pd, pd, phdr->caplen);
3598 g_async_queue_lock(pcap_queue);
3599 if (((pcap_queue_byte_limit > 0) && (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3600 ((pcap_queue_packet_limit > 0) && (pcap_queue_packets < pcap_queue_packet_limit))) {
3601 limit_reached = FALSE;
3602 g_async_queue_push_unlocked(pcap_queue, queue_element);
3603 pcap_queue_bytes += phdr->caplen;
3604 pcap_queue_packets += 1;
3606 limit_reached = TRUE;
3608 g_async_queue_unlock(pcap_queue);
3609 if (limit_reached) {
3610 g_free(queue_element->pd);
3611 g_free(queue_element);
3612 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3613 "Dropped a packet of length %d captured on interface %u.",
3614 phdr->caplen, interface_id);
3616 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3617 "Queued a packet of length %d captured on interface %u.",
3618 phdr->caplen, interface_id);
3620 /* I don't want to hold the mutex over the debug output. So the
3621 output may be wrong */
3622 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3623 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3624 pcap_queue_bytes, pcap_queue_packets);
3627 /* And now our feature presentation... [ fade to music ] */
3629 main(int argc, char *argv[])
3632 gboolean arg_error = FALSE;
3639 struct sigaction action, oldaction;
3642 gboolean start_capture = TRUE;
3643 gboolean stats_known;
3644 struct pcap_stat stats;
3645 GLogLevelFlags log_flags;
3646 gboolean list_interfaces = FALSE;
3647 gboolean list_link_layer_types = FALSE;
3648 #ifdef HAVE_BPF_IMAGE
3649 gboolean print_bpf_code = FALSE;
3651 gboolean machine_readable = FALSE;
3652 gboolean print_statistics = FALSE;
3653 int status, run_once_args = 0;
3656 #if defined(__APPLE__) && defined(__LP64__)
3657 struct utsname osinfo;
3661 /* Convert our arg list to UTF-8. */
3662 wc_argv = CommandLineToArgvW(GetCommandLineW(), &wc_argc);
3663 if (wc_argv && wc_argc == argc) {
3664 for (i = 0; i < argc; i++) {
3665 argv[i] = g_utf16_to_utf8(wc_argv[i], -1, NULL, NULL, NULL);
3667 } /* XXX else bail because something is horribly, horribly wrong? */
3672 * Initialize our DLL search path. MUST be called before LoadLibrary
3675 ws_init_dll_search_path();
3678 #ifdef HAVE_PCAP_REMOTE
3679 #define OPTSTRING_A "A:"
3680 #define OPTSTRING_r "r"
3681 #define OPTSTRING_u "u"
3683 #define OPTSTRING_A ""
3684 #define OPTSTRING_r ""
3685 #define OPTSTRING_u ""
3688 #ifdef HAVE_PCAP_SETSAMPLING
3689 #define OPTSTRING_m "m:"
3691 #define OPTSTRING_m ""
3694 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3695 #define OPTSTRING_B "B:"
3697 #define OPTSTRING_B ""
3698 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3700 #ifdef HAVE_PCAP_CREATE
3701 #define OPTSTRING_I "I"
3703 #define OPTSTRING_I ""
3706 #ifdef HAVE_BPF_IMAGE
3707 #define OPTSTRING_d "d"
3709 #define OPTSTRING_d ""
3712 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "L" OPTSTRING_m "Mnpq" OPTSTRING_r "Ss:t" OPTSTRING_u "vw:y:Z:"
3714 #ifdef DEBUG_CHILD_DUMPCAP
3715 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3716 fprintf (stderr, "Unable to open debug log file !\n");
3721 #if defined(__APPLE__) && defined(__LP64__)
3723 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3724 * a bug workaround - timeouts less than 1 second don't work with libpcap
3725 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3726 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3727 * The problem is extremely unlikely to be reintroduced in a future
3730 if (uname(&osinfo) == 0) {
3732 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3733 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3734 * number of 10.0.0, not 10.1.0 - go figure).
3736 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3737 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3738 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3739 need_timeout_workaround = TRUE;
3744 * Determine if dumpcap is being requested to run in a special
3745 * capture_child mode by going thru the command line args to see if
3746 * a -Z is present. (-Z is a hidden option).
3748 * The primary result of running in capture_child mode is that
3749 * all messages sent out on stderr are in a special type/len/string
3750 * format to allow message processing by type. These messages include
3751 * error messages if dumpcap fails to start the operation it was
3752 * requested to do, as well as various "status" messages which are sent
3753 * when an actual capture is in progress, and a "success" message sent
3754 * if dumpcap was requested to perform an operation other than a
3757 * Capture_child mode would normally be requested by a parent process
3758 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3759 * to which dumpcap stderr has been redirected. It might also have
3760 * another pipe to obtain dumpcap stdout output; for operations other
3761 * than a capture, that information is formatted specially for easier
3762 * parsing by the parent process.
3764 * Capture_child mode needs to be determined immediately upon
3765 * startup so that any messages generated by dumpcap in this mode
3766 * (eg: during initialization) will be formatted properly.
3769 for (i=1; i<argc; i++) {
3770 if (strcmp("-Z", argv[i]) == 0) {
3771 capture_child = TRUE;
3772 machine_readable = TRUE; /* request machine-readable output */
3774 /* set output pipe to binary mode, to avoid ugly text conversions */
3775 _setmode(2, O_BINARY);
3780 /* The default_log_handler will use stdout, which makes trouble in */
3781 /* capture child mode, as it uses stdout for it's sync_pipe. */
3782 /* So: the filtering is done in the console_log_handler and not here.*/
3783 /* We set the log handlers right up front to make sure that any log */
3784 /* messages when running as child will be sent back to the parent */
3785 /* with the correct format. */
3789 G_LOG_LEVEL_CRITICAL|
3790 G_LOG_LEVEL_WARNING|
3791 G_LOG_LEVEL_MESSAGE|
3794 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3796 g_log_set_handler(NULL,
3798 console_log_handler, NULL /* user_data */);
3799 g_log_set_handler(LOG_DOMAIN_MAIN,
3801 console_log_handler, NULL /* user_data */);
3802 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3804 console_log_handler, NULL /* user_data */);
3805 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3807 console_log_handler, NULL /* user_data */);
3809 /* Initialize the thread system */
3810 if (!g_thread_supported())
3811 g_thread_init(NULL);
3813 /* Load wpcap if possible. Do this before collecting the run-time version information */
3816 /* ... and also load the packet.dll from wpcap */
3817 /* XXX - currently not required, may change later. */
3818 /*wpcap_packet_load();*/
3820 /* Start windows sockets */
3821 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3823 /* Set handler for Ctrl+C key */
3824 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3826 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3828 action.sa_handler = capture_cleanup_handler;
3830 * Arrange that system calls not get restarted, because when
3831 * our signal handler returns we don't want to restart
3832 * a call that was waiting for packets to arrive.
3834 action.sa_flags = 0;
3835 sigemptyset(&action.sa_mask);
3836 sigaction(SIGTERM, &action, NULL);
3837 sigaction(SIGINT, &action, NULL);
3838 sigaction(SIGPIPE, &action, NULL);
3839 sigaction(SIGHUP, NULL, &oldaction);
3840 if (oldaction.sa_handler == SIG_DFL)
3841 sigaction(SIGHUP, &action, NULL);
3844 /* Catch SIGINFO and, if we get it and we're capturing in
3845 quiet mode, report the number of packets we've captured. */
3846 action.sa_handler = report_counts_siginfo;
3847 action.sa_flags = SA_RESTART;
3848 sigemptyset(&action.sa_mask);
3849 sigaction(SIGINFO, &action, NULL);
3850 #endif /* SIGINFO */
3853 /* ----------------------------------------------------------------- */
3854 /* Privilege and capability handling */
3856 /* 1. Running not as root or suid root; no special capabilities. */
3859 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3862 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3864 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3865 /* capabilities; Drop all other capabilities; */
3866 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3867 /* else: after pcap_open_live() in capture_loop_open_input() */
3868 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3869 /* (Note: this means that the process, although logged in */
3870 /* as root, does not have various permissions such as the */
3871 /* ability to bypass file access permissions). */
3872 /* XXX: Should we just leave capabilities alone in this case */
3873 /* so that user gets expected effect that root can do */
3876 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3878 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3879 /* else: after pcap_open_live() in capture_loop_open_input() */
3880 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3881 /* pcap_open_live). */
3883 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3885 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3886 /* capabilities; Drop all other capabilities; */
3887 /* Drop suid privileges (euid=ruid); */
3888 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3889 /* else: after pcap_open_live() in capture_loop_open_input() */
3890 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3892 /* XXX: For some Linux versions/distros with capabilities */
3893 /* a 'normal' process with any capabilities cannot be */
3894 /* 'killed' (signaled) from another (same uid) non-privileged */
3896 /* For example: If (non-suid) Wireshark forks a */
3897 /* child suid dumpcap which acts as described here (case 5), */
3898 /* Wireshark will be unable to kill (signal) the child */
3899 /* dumpcap process until the capabilities have been dropped */
3900 /* (after pcap_open_live()). */
3901 /* This behaviour will apparently be changed in the kernel */
3902 /* to allow the kill (signal) in this case. */
3903 /* See the following for details: */
3904 /* http://www.mail-archive.com/ [wrapped] */
3905 /* linux-security-module@vger.kernel.org/msg02913.html */
3907 /* It is therefore conceivable that if dumpcap somehow hangs */
3908 /* in pcap_open_live or before that wireshark will not */
3909 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3910 /* In this case, exiting wireshark will kill the child */
3911 /* dumpcap process. */
3913 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3914 /* capabilities; Using libcap. Note: capset cmd (which see) */
3915 /* used to assign capabilities to file. */
3917 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3918 /* else: after pcap_open_live() in capture_loop_open_input() */
3919 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3921 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3922 /* longer required (similar to capture). */
3924 /* ----------------------------------------------------------------- */
3926 init_process_policies();
3929 /* If 'started with special privileges' (and using libcap) */
3930 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3931 /* Set euid/egid = ruid/rgid to remove suid privileges */
3932 relinquish_privs_except_capture();
3935 /* Set the initial values in the capture options. This might be overwritten
3936 by the command line parameters. */
3937 capture_opts_init(&global_capture_opts, NULL);
3939 /* Default to capturing the entire packet. */
3940 global_capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
3942 /* We always save to a file - if no file was specified, we save to a
3944 global_capture_opts.saving_to_file = TRUE;
3945 global_capture_opts.has_ring_num_files = TRUE;
3947 /* Now get our args */
3948 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3950 case 'h': /* Print help and exit */
3954 case 'v': /* Show version and exit */
3956 GString *comp_info_str;
3957 GString *runtime_info_str;
3958 /* Assemble the compile-time version information string */
3959 comp_info_str = g_string_new("Compiled ");
3960 get_compiled_version_info(comp_info_str, NULL, NULL);
3962 /* Assemble the run-time version information string */
3963 runtime_info_str = g_string_new("Running ");
3964 get_runtime_version_info(runtime_info_str, NULL);
3965 show_version(comp_info_str, runtime_info_str);
3966 g_string_free(comp_info_str, TRUE);
3967 g_string_free(runtime_info_str, TRUE);
3971 /*** capture option specific ***/
3972 case 'a': /* autostop criteria */
3973 case 'b': /* Ringbuffer option */
3974 case 'c': /* Capture x packets */
3975 case 'f': /* capture filter */
3976 case 'i': /* Use interface x */
3977 case 'n': /* Use pcapng format */
3978 case 'p': /* Don't capture in promiscuous mode */
3979 case 's': /* Set the snapshot (capture) length */
3980 case 'w': /* Write to capture file x */
3981 case 'g': /* enable group read accesson file(s) */
3982 case 'y': /* Set the pcap data link type */
3983 #ifdef HAVE_PCAP_REMOTE
3984 case 'u': /* Use UDP for data transfer */
3985 case 'r': /* Capture own RPCAP traffic too */
3986 case 'A': /* Authentication */
3988 #ifdef HAVE_PCAP_SETSAMPLING
3989 case 'm': /* Sampling */
3991 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3992 case 'B': /* Buffer size */
3993 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3994 #ifdef HAVE_PCAP_CREATE
3995 case 'I': /* Monitor mode */
3997 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4002 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4004 capture_child = TRUE;
4006 /* set output pipe to binary mode, to avoid ugly text conversions */
4007 _setmode(2, O_BINARY);
4009 * optarg = the control ID, aka the PPID, currently used for the
4012 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4013 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4014 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4015 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4017 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4018 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4019 "Signal pipe: Unable to open %s. Dead parent?",
4027 case 'q': /* Quiet */
4034 /*** all non capture option specific ***/
4035 case 'D': /* Print a list of capture devices and exit */
4036 list_interfaces = TRUE;
4039 case 'L': /* Print list of link-layer types and exit */
4040 list_link_layer_types = TRUE;
4043 #ifdef HAVE_BPF_IMAGE
4044 case 'd': /* Print BPF code for capture filter and exit */
4045 print_bpf_code = TRUE;
4049 case 'S': /* Print interface statistics once a second */
4050 print_statistics = TRUE;
4053 case 'M': /* For -D, -L, and -S, print machine-readable output */
4054 machine_readable = TRUE;
4057 case '?': /* Bad flag - print usage message */
4058 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4066 /* user specified file name as regular command-line argument */
4067 /* XXX - use it as the capture file name (or something else)? */
4074 * Extra command line arguments were specified; complain.
4075 * XXX - interpret as capture filter, as tcpdump and tshark do?
4077 cmdarg_err("Invalid argument: %s", argv[0]);
4086 if (run_once_args > 1) {
4087 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4089 } else if (run_once_args == 1) {
4090 /* We're supposed to print some information, rather than
4091 to capture traffic; did they specify a ring buffer option? */
4092 if (global_capture_opts.multi_files_on) {
4093 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4097 /* We're supposed to capture traffic; was the ring buffer option
4098 specified and, if so, does it make sense? */
4099 if (global_capture_opts.multi_files_on) {
4100 /* Ring buffer works only under certain conditions:
4101 a) ring buffer does not work with temporary files;
4102 b) it makes no sense to enable the ring buffer if the maximum
4103 file size is set to "infinite". */
4104 if (global_capture_opts.save_file == NULL) {
4105 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4106 global_capture_opts.multi_files_on = FALSE;
4108 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4109 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4111 /* XXX - this must be redesigned as the conditions changed */
4112 global_capture_opts.multi_files_on = FALSE;
4119 * "-D" requires no interface to be selected; it's supposed to list
4122 if (list_interfaces) {
4123 /* Get the list of interfaces */
4128 if_list = capture_interface_list(&err, &err_str);
4129 if (if_list == NULL) {
4131 case CANT_GET_INTERFACE_LIST:
4132 cmdarg_err("%s", err_str);
4137 case NO_INTERFACES_FOUND:
4139 * If we're being run by another program, just give them
4140 * an empty list of interfaces, don't report this as
4141 * an error; that lets them decide whether to report
4142 * this as an error or not.
4144 if (!machine_readable) {
4145 cmdarg_err("There are no interfaces on which a capture can be done");
4152 if (machine_readable) /* tab-separated values to stdout */
4153 print_machine_readable_interfaces(if_list);
4155 capture_opts_print_interfaces(if_list);
4156 free_interface_list(if_list);
4161 * "-S" requires no interface to be selected; it gives statistics
4162 * for all interfaces.
4164 if (print_statistics) {
4165 status = print_statistics_loop(machine_readable);
4170 * "-L", "-d", and capturing act on a particular interface, so we have to
4171 * have an interface; if none was specified, pick a default.
4173 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4174 /* cmdarg_err() already called .... */
4178 /* Let the user know what interfaces were chosen. */
4179 /* get_interface_descriptive_name() is not available! */
4180 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4181 interface_options interface_opts;
4183 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4184 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s", interface_opts.name);
4187 if (list_link_layer_types) {
4188 /* Get the list of link-layer types for the capture device. */
4189 if_capabilities_t *caps;
4193 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4194 interface_options interface_opts;
4196 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4197 caps = get_if_capabilities(interface_opts.name,
4198 interface_opts.monitor_mode, &err_str);
4200 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4201 "Please check to make sure you have sufficient permissions, and that\n"
4202 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4206 if (caps->data_link_types == NULL) {
4207 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4210 if (machine_readable) /* tab-separated values to stdout */
4211 /* XXX: We need to change the format and adopt consumers */
4212 print_machine_readable_if_capabilities(caps);
4214 /* XXX: We might want to print also the interface name */
4215 capture_opts_print_if_capabilities(caps, interface_opts.name,
4216 interface_opts.monitor_mode);
4217 free_if_capabilities(caps);
4222 /* We're supposed to do a capture, or print the BPF code for a filter.
4223 Process the snapshot length, as that affects the generated BPF code. */
4224 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4226 #ifdef HAVE_BPF_IMAGE
4227 if (print_bpf_code) {
4228 show_filter_code(&global_capture_opts);
4233 /* We're supposed to do a capture. Process the ring buffer arguments. */
4234 capture_opts_trim_ring_num_files(&global_capture_opts);
4236 /* Now start the capture. */
4238 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4242 /* capture failed */
4245 return 0; /* never here, make compiler happy */
4250 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4251 const char *message, gpointer user_data _U_)
4258 /* ignore log message, if log_level isn't interesting */
4259 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4260 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4265 /* create a "timestamp" */
4267 today = localtime(&curr);
4269 switch(log_level & G_LOG_LEVEL_MASK) {
4270 case G_LOG_LEVEL_ERROR:
4273 case G_LOG_LEVEL_CRITICAL:
4276 case G_LOG_LEVEL_WARNING:
4279 case G_LOG_LEVEL_MESSAGE:
4282 case G_LOG_LEVEL_INFO:
4285 case G_LOG_LEVEL_DEBUG:
4289 fprintf(stderr, "unknown log_level %u\n", log_level);
4291 g_assert_not_reached();
4294 /* Generate the output message */
4295 if(log_level & G_LOG_LEVEL_MESSAGE) {
4296 /* normal user messages without additional infos */
4297 msg = g_strdup_printf("%s\n", message);
4299 /* info/debug messages with additional infos */
4300 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4301 today->tm_hour, today->tm_min, today->tm_sec,
4302 log_domain != NULL ? log_domain : "",
4306 /* DEBUG & INFO msgs (if we're debugging today) */
4307 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4308 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4309 #ifdef DEBUG_DUMPCAP
4310 fprintf(stderr, "%s", msg);
4313 #ifdef DEBUG_CHILD_DUMPCAP
4314 fprintf(debug_log, "%s", msg);
4322 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4323 /* to parent especially formatted if dumpcap running as child. */
4324 if (capture_child) {
4325 sync_pipe_errmsg_to_parent(2, msg, "");
4327 fprintf(stderr, "%s", msg);
4334 /****************************************************************************************************************/
4335 /* indication report routines */
4339 report_packet_count(int packet_count)
4341 char tmp[SP_DECISIZE+1+1];
4342 static int count = 0;
4345 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4346 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4347 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4349 count += packet_count;
4350 fprintf(stderr, "\rPackets: %u ", count);
4351 /* stderr could be line buffered */
4357 report_new_capture_file(const char *filename)
4360 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4361 pipe_write_block(2, SP_FILE, filename);
4365 * Prevent a SIGINFO handler from writing to the standard error
4366 * while we're doing so; instead, have it just set a flag telling
4367 * us to print that information when we're done.
4370 #endif /* SIGINFO */
4371 fprintf(stderr, "File: %s\n", filename);
4372 /* stderr could be line buffered */
4377 * Allow SIGINFO handlers to write.
4382 * If a SIGINFO handler asked us to write out capture counts, do so.
4385 report_counts_for_siginfo();
4386 #endif /* SIGINFO */
4391 report_cfilter_error(const char *cfilter, const char *errmsg)
4393 if (capture_child) {
4394 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4395 pipe_write_block(2, SP_BAD_FILTER, errmsg);
4398 "Invalid capture filter: \"%s\"!\n"
4400 "That string isn't a valid capture filter (%s).\n"
4401 "See the User's Guide for a description of the capture filter syntax.\n",
4407 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4410 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4411 "Primary Error: %s", error_msg);
4412 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4413 "Secondary Error: %s", secondary_error_msg);
4414 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4416 fprintf(stderr, "%s\n", error_msg);
4417 if (secondary_error_msg[0] != '\0')
4418 fprintf(stderr, "%s\n", secondary_error_msg);
4423 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4425 char tmp1[SP_DECISIZE+1+1];
4426 char tmp2[SP_DECISIZE+1+1];
4428 g_snprintf(tmp1, sizeof(tmp1), "%u", received);
4429 g_snprintf(tmp2, sizeof(tmp2), "%u", drops);
4432 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets captured/dropped on interface %s: %s/%s", name, tmp1, tmp2);
4433 /* XXX: Need to provide interface id, changes to consumers required. */
4434 pipe_write_block(2, SP_DROPS, tmp2);
4436 fprintf(stderr, "Packets captured/dropped on interface %s: %s/%s\n", name, tmp1, tmp2);
4437 /* stderr could be line buffered */
4443 /****************************************************************************************************************/
4444 /* signal_pipe handling */
4449 signal_pipe_check_running(void)
4451 /* any news from our parent? -> just stop the capture */
4455 /* if we are running standalone, no check required */
4456 if(!capture_child) {
4460 if(!sig_pipe_name || !sig_pipe_handle) {
4461 /* This shouldn't happen */
4462 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4463 "Signal pipe: No name or handle");
4468 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4469 * at this point. Should we check to see if the parent is still alive,
4470 * e.g. by using OpenProcess?
4473 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4475 if(!result || avail > 0) {
4476 /* peek failed or some bytes really available */
4477 /* (if not piping from stdin this would fail) */
4478 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4479 "Signal pipe: Stop capture: %s", sig_pipe_name);
4480 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4481 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4482 sig_pipe_handle, result, avail);
4485 /* pipe ok and no bytes available */
4492 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4497 * indent-tabs-mode: nil
4500 * vi: set shiftwidth=4 tabstop=8 expandtab
4501 * :indentSize=4:tabSize=8:noTabs=true: