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 gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
144 static gchar *sig_pipe_name = NULL;
145 static HANDLE sig_pipe_handle = NULL;
146 static gboolean signal_pipe_check_running(void);
150 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
151 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
154 /** Stop a low-level capture (stops the capture child). */
155 static void capture_loop_stop(void);
157 #if !defined (__linux__)
158 #ifndef HAVE_PCAP_BREAKLOOP
160 * We don't have pcap_breakloop(), which is the only way to ensure that
161 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
162 * won't, if the call to read the next packet or batch of packets is
163 * is interrupted by a signal on UN*X, just go back and try again to
166 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
167 * the signal handler, set a flag to stop capturing; however, without
168 * a guarantee of that sort, we can't guarantee that we'll stop capturing
169 * if the read will be retried and won't time out if no packets arrive.
171 * Therefore, on at least some platforms, we work around the lack of
172 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
173 * to wait for packets to arrive, so that we're probably going to be
174 * blocked in the select() when the signal arrives, and can just bail
175 * out of the loop at that point.
177 * However, we don't want to do that on BSD (because "select()" doesn't work
178 * correctly on BPF devices on at least some releases of some flavors of
179 * BSD), and we don't want to do it on Windows (because "select()" is
180 * something for sockets, not for arbitrary handles). (Note that "Windows"
181 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
182 * using WinPcap, not a UNIX libpcap.)
184 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
185 * on BSD times out even if no packets have arrived, so we'll eventually
186 * exit pcap_dispatch() with an indication that no packets have arrived,
187 * and will break out of the capture loop at that point.
189 * On Windows, we can't send a SIGINT to stop capturing, so none of this
190 * applies in any case.
192 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
193 * want to include it if it's not present on this platform, however.
195 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
196 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
198 # define MUST_DO_SELECT
199 # endif /* avoid select */
200 #endif /* HAVE_PCAP_BREAKLOOP */
202 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
203 * in pcap_dispatch(); on the other hand, select() works just fine there.
204 * Hence we use a select for that come what may.
206 #define MUST_DO_SELECT
209 /** init the capture filter */
212 INITFILTER_BAD_FILTER,
213 INITFILTER_OTHER_ERROR
214 } initfilter_status_t;
216 typedef struct _pcap_options {
218 #ifdef MUST_DO_SELECT
219 int pcap_fd; /* pcap file descriptor */
226 /* capture pipe (unix only "input file") */
227 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
228 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
229 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
231 HANDLE cap_pipe_h; /* The handle of the capture pipe */
233 int cap_pipe_fd; /* the file descriptor of the capture pipe */
235 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
236 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
238 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
239 #endif /* USE_THREADS */
240 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
241 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
243 STATE_EXPECT_REC_HDR,
248 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
250 GMutex *cap_pipe_read_mtx;
251 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
255 typedef struct _loop_data {
257 gboolean go; /* TRUE as long as we're supposed to keep capturing */
258 int err; /* if non-zero, error seen while capturing */
259 gint packet_count; /* Number of packets we have already captured */
260 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
261 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
263 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
270 guint32 autostop_files;
274 * Standard secondary message for unexpected errors.
276 static const char please_report[] =
277 "Please report this to the Wireshark developers.\n"
278 "(This is not a crash; please do not report it as such.)";
281 * This needs to be static, so that the SIGINT handler can clear the "go"
284 static loop_data global_ld;
288 * Timeout, in milliseconds, for reads from the stream of captured packets
289 * from a capture device.
291 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
292 * 64-bit applications, with sub-second timeouts not to work. The bug is
293 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
295 #if defined(__APPLE__) && defined(__LP64__)
296 static gboolean need_timeout_workaround;
298 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
300 #define CAP_READ_TIMEOUT 250
304 * Timeout, in microseconds, for reads from the stream of captured packets
305 * from a pipe. Pipes don't have the same problem that BPF devices do
306 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
307 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
308 * of the offending versions of Snow Leopard.
310 * On Windows this value is converted to milliseconds and passed to
311 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
312 * will return immediately.
315 #define PIPE_READ_TIMEOUT 250000
317 #define PIPE_READ_TIMEOUT 100000
319 static const char *cap_pipe_err_str;
322 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
323 const char *message, gpointer user_data _U_);
325 /* capture related options */
326 static capture_options global_capture_opts;
327 static gboolean quiet = FALSE;
329 static void capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
331 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
332 int err, gboolean is_close);
334 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
336 static void report_new_capture_file(const char *filename);
337 static void report_packet_count(int packet_count);
338 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
339 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
340 static void report_cfilter_error(const char *cfilter, const char *errmsg);
342 #define MSG_MAX_LENGTH 4096
345 print_usage(gboolean print_ver)
352 "Dumpcap " VERSION "%s\n"
353 "Capture network packets and dump them into a libpcap file.\n"
354 "See http://www.wireshark.org for more information.\n",
355 wireshark_svnversion);
359 fprintf(output, "\nUsage: dumpcap [options] ...\n");
360 fprintf(output, "\n");
361 fprintf(output, "Capture interface:\n");
362 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
363 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
364 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
365 fprintf(output, " -p don't capture in promiscuous mode\n");
366 #ifdef HAVE_PCAP_CREATE
367 fprintf(output, " -I capture in monitor mode, if available\n");
369 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
370 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
372 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
373 fprintf(output, " -D print list of interfaces and exit\n");
374 fprintf(output, " -L print list of link-layer types of iface and exit\n");
375 #ifdef HAVE_BPF_IMAGE
376 fprintf(output, " -d print generated BPF code for capture filter\n");
378 fprintf(output, " -S print statistics for each interface once every second\n");
379 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
380 fprintf(output, "\n");
381 #ifdef HAVE_PCAP_REMOTE
382 fprintf(output, "\nRPCAP options:\n");
383 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
384 fprintf(output, " -u use UDP for RPCAP data transfer\n");
385 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
386 #ifdef HAVE_PCAP_SETSAMPLING
387 fprintf(output, " -m <sampling type> use packet sampling\n");
388 fprintf(output, " count:NUM - capture one packet of every NUM\n");
389 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
392 fprintf(output, "Stop conditions:\n");
393 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
394 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
395 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
396 fprintf(output, " files:NUM - stop after NUM files\n");
397 /*fprintf(output, "\n");*/
398 fprintf(output, "Output (files):\n");
399 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
400 fprintf(output, " -g enable group read access on the output file(s)\n");
401 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
402 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
403 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
404 fprintf(output, " -n use pcapng format instead of pcap\n");
405 /*fprintf(output, "\n");*/
406 fprintf(output, "Miscellaneous:\n");
407 fprintf(output, " -q don't report packet capture counts\n");
408 fprintf(output, " -v print version information and exit\n");
409 fprintf(output, " -h display this help and exit\n");
410 fprintf(output, "\n");
411 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
412 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
413 fprintf(output, "\n");
414 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
418 show_version(GString *comp_info_str, GString *runtime_info_str)
421 "Dumpcap " VERSION "%s\n"
426 "See http://www.wireshark.org for more information.\n",
427 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
431 * Print to the standard error. This is a command-line tool, so there's
432 * no need to pop up a console.
435 vfprintf_stderr(const char *fmt, va_list ap)
437 vfprintf(stderr, fmt, ap);
441 fprintf_stderr(const char *fmt, ...)
446 vfprintf_stderr(fmt, ap);
451 * Report an error in command-line arguments.
454 cmdarg_err(const char *fmt, ...)
460 /* Generate a 'special format' message back to parent */
462 msg = g_strdup_vprintf(fmt, ap);
463 sync_pipe_errmsg_to_parent(2, msg, "");
468 fprintf(stderr, "dumpcap: ");
469 vfprintf(stderr, fmt, ap);
470 fprintf(stderr, "\n");
476 * Report additional information for an error in command-line arguments.
479 cmdarg_err_cont(const char *fmt, ...)
486 msg = g_strdup_vprintf(fmt, ap);
487 sync_pipe_errmsg_to_parent(2, msg, "");
492 vfprintf(stderr, fmt, ap);
493 fprintf(stderr, "\n");
500 #if 0 /* Set to enable capability debugging */
501 /* see 'man cap_to_text()' for explanation of output */
502 /* '=' means 'all= ' ie: no capabilities */
503 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
505 print_caps(const char *pfx) {
506 cap_t caps = cap_get_proc();
507 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
508 "%s: EUID: %d Capabilities: %s", pfx,
509 geteuid(), cap_to_text(caps, NULL));
512 print_caps(const char *pfx _U_) {
517 relinquish_all_capabilities(void)
519 /* Drop any and all capabilities this process may have. */
520 /* Allowed whether or not process has any privileges. */
521 cap_t caps = cap_init(); /* all capabilities initialized to off */
522 print_caps("Pre-clear");
523 if (cap_set_proc(caps)) {
524 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
526 print_caps("Post-clear");
532 open_capture_device(interface_options *interface_opts,
533 char (*open_err_str)[PCAP_ERRBUF_SIZE])
536 #ifdef HAVE_PCAP_CREATE
539 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
540 struct pcap_rmtauth auth;
543 /* Open the network interface to capture from it.
544 Some versions of libpcap may put warnings into the error buffer
545 if they succeed; to tell if that's happened, we have to clear
546 the error buffer, and check if it's still a null string. */
547 (*open_err_str)[0] = '\0';
548 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
550 * If we're opening a remote device, use pcap_open(); that's currently
551 * the only open routine that supports remote devices.
553 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
554 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
555 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
556 auth.username = interface_opts->auth_username;
557 auth.password = interface_opts->auth_password;
559 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
561 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
562 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
563 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
564 CAP_READ_TIMEOUT, &auth, *open_err_str);
569 * If we're not opening a remote device, use pcap_create() and
570 * pcap_activate() if we have them, so that we can set the buffer
571 * size, otherwise use pcap_open_live().
573 #ifdef HAVE_PCAP_CREATE
574 pcap_h = pcap_create(interface_opts->name, *open_err_str);
575 if (pcap_h != NULL) {
576 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
577 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
578 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
580 if (interface_opts->buffer_size > 1) {
581 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
583 if (interface_opts->monitor_mode)
584 pcap_set_rfmon(pcap_h, 1);
585 err = pcap_activate(pcap_h);
587 /* Failed to activate, set to NULL */
588 if (err == PCAP_ERROR)
589 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
591 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
597 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
598 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
603 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
604 /* to remove any suid privileges. */
605 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
606 /* (euid/egid have already previously been set to ruid/rgid. */
607 /* (See comment in main() for details) */
609 relinquish_special_privs_perm();
611 relinquish_all_capabilities();
618 get_capture_device_open_failure_messages(const char *open_err_str,
624 char *errmsg, size_t errmsg_len,
625 char *secondary_errmsg,
626 size_t secondary_errmsg_len)
628 const char *libpcap_warn;
629 static const char ppamsg[] = "can't find PPA for ";
631 /* If we got a "can't find PPA for X" message, warn the user (who
632 is running dumcap on HP-UX) that they don't have a version of
633 libpcap that properly handles HP-UX (libpcap 0.6.x and later
634 versions, which properly handle HP-UX, say "can't find /dev/dlpi
635 PPA for X" rather than "can't find PPA for X"). */
636 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
639 "You are running (T)Wireshark with a version of the libpcap library\n"
640 "that doesn't handle HP-UX network devices well; this means that\n"
641 "(T)Wireshark may not be able to capture packets.\n"
643 "To fix this, you should install libpcap 0.6.2, or a later version\n"
644 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
645 "packaged binary form from the Software Porting And Archive Centre\n"
646 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
647 "at the URL lists a number of mirror sites.";
650 g_snprintf(errmsg, (gulong) errmsg_len,
651 "The capture session could not be initiated (%s).", open_err_str);
653 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
654 "Please check to make sure you have sufficient permissions, and that you have "
655 "the proper interface or pipe specified.%s", libpcap_warn);
657 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
659 "Please check that \"%s\" is the proper interface.\n"
662 "Help can be found at:\n"
664 " http://wiki.wireshark.org/WinPcap\n"
665 " http://wiki.wireshark.org/CaptureSetup\n",
670 /* Set the data link type on a pcap. */
672 set_pcap_linktype(pcap_t *pcap_h, int linktype,
673 #ifdef HAVE_PCAP_SET_DATALINK
678 char *errmsg, size_t errmsg_len,
679 char *secondary_errmsg, size_t secondary_errmsg_len)
681 char *set_linktype_err_str;
684 return TRUE; /* just use the default */
685 #ifdef HAVE_PCAP_SET_DATALINK
686 if (pcap_set_datalink(pcap_h, linktype) == 0)
687 return TRUE; /* no error */
688 set_linktype_err_str = pcap_geterr(pcap_h);
690 /* Let them set it to the type it is; reject any other request. */
691 if (get_pcap_linktype(pcap_h, name) == linktype)
692 return TRUE; /* no error */
693 set_linktype_err_str =
694 "That DLT isn't one of the DLTs supported by this device";
696 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
697 set_linktype_err_str);
699 * If the error isn't "XXX is not one of the DLTs supported by this device",
700 * tell the user to tell the Wireshark developers about it.
702 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
703 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
705 secondary_errmsg[0] = '\0';
710 compile_capture_filter(const char *iface, pcap_t *pcap_h,
711 struct bpf_program *fcode, char *cfilter)
713 bpf_u_int32 netnum, netmask;
714 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
716 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
718 * Well, we can't get the netmask for this interface; it's used
719 * only for filters that check for broadcast IP addresses, so
720 * we just punt and use 0. It might be nice to warn the user,
721 * but that's a pain in a GUI application, as it'd involve popping
722 * up a message box, and it's not clear how often this would make
723 * a difference (only filters that check for IP broadcast addresses
727 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
730 if (pcap_compile(pcap_h, fcode, cfilter, 1, netmask) < 0)
735 #ifdef HAVE_BPF_IMAGE
737 show_filter_code(capture_options *capture_opts)
739 interface_options interface_opts;
741 gchar open_err_str[PCAP_ERRBUF_SIZE];
742 char errmsg[MSG_MAX_LENGTH+1];
743 char secondary_errmsg[MSG_MAX_LENGTH+1];
744 struct bpf_program fcode;
745 struct bpf_insn *insn;
749 for (j = 0; j < capture_opts->ifaces->len; j++) {
750 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
751 pcap_h = open_capture_device(&interface_opts, &open_err_str);
752 if (pcap_h == NULL) {
753 /* Open failed; get messages */
754 get_capture_device_open_failure_messages(open_err_str,
756 errmsg, sizeof errmsg,
758 sizeof secondary_errmsg);
759 /* And report them */
760 report_capture_error(errmsg, secondary_errmsg);
764 /* Set the link-layer type. */
765 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
766 errmsg, sizeof errmsg,
767 secondary_errmsg, sizeof secondary_errmsg)) {
769 report_capture_error(errmsg, secondary_errmsg);
773 /* OK, try to compile the capture filter. */
774 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
775 interface_opts.cfilter)) {
777 report_cfilter_error(interface_opts.cfilter, errmsg);
782 /* Now print the filter code. */
783 insn = fcode.bf_insns;
785 for (i = 0; i < fcode.bf_len; insn++, i++)
786 printf("%s\n", bpf_image(insn, i));
789 /* Let our parent know we succeeded. */
790 pipe_write_block(2, SP_SUCCESS, NULL);
797 * capture_interface_list() is expected to do the right thing to get
798 * a list of interfaces.
800 * In most of the programs in the Wireshark suite, "the right thing"
801 * is to run dumpcap and ask it for the list, because dumpcap may
802 * be the only program in the suite with enough privileges to get
805 * In dumpcap itself, however, we obviously can't run dumpcap to
806 * ask for the list. Therefore, our capture_interface_list() should
807 * just call get_interface_list().
810 capture_interface_list(int *err, char **err_str)
812 return get_interface_list(err, err_str);
816 * Get the data-link type for a libpcap device.
817 * This works around AIX 5.x's non-standard and incompatible-with-the-
818 * rest-of-the-universe libpcap.
821 get_pcap_linktype(pcap_t *pch, const char *devname
829 const char *ifacename;
832 linktype = pcap_datalink(pch);
836 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
837 * rather than DLT_ values for link-layer types; the ifType values
838 * for LAN devices are:
845 * and the ifType value for a loopback device is 24.
847 * The AIX names for LAN devices begin with:
854 * and the AIX names for loopback devices begin with "lo".
856 * (The difference between "Ethernet" and "802.3" is presumably
857 * whether packets have an Ethernet header, with a packet type,
858 * or an 802.3 header, with a packet length, followed by an 802.2
859 * header and possibly a SNAP header.)
861 * If the device name matches "linktype" interpreted as an ifType
862 * value, rather than as a DLT_ value, we will assume this is AIX's
863 * non-standard, incompatible libpcap, rather than a standard libpcap,
864 * and will map the link-layer type to the standard DLT_ value for
865 * that link-layer type, as that's what the rest of Wireshark expects.
867 * (This means the capture files won't be readable by a tcpdump
868 * linked with AIX's non-standard libpcap, but so it goes. They
869 * *will* be readable by standard versions of tcpdump, Wireshark,
872 * XXX - if we conclude we're using AIX libpcap, should we also
873 * set a flag to cause us to assume the time stamps are in
874 * seconds-and-nanoseconds form, and to convert them to
875 * seconds-and-microseconds form before processing them and
880 * Find the last component of the device name, which is the
883 ifacename = strchr(devname, '/');
884 if (ifacename == NULL)
887 /* See if it matches any of the LAN device names. */
888 if (strncmp(ifacename, "en", 2) == 0) {
891 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
895 } else if (strncmp(ifacename, "et", 2) == 0) {
898 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
899 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
904 } else if (strncmp(ifacename, "tr", 2) == 0) {
907 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
908 * DLT_IEEE802, which is what's used for Token Ring.
912 } else if (strncmp(ifacename, "fi", 2) == 0) {
913 if (linktype == 15) {
915 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
919 } else if (strncmp(ifacename, "lo", 2) == 0) {
920 if (linktype == 24) {
922 * That's the RFC 1573 value for "software loopback" devices; map it
923 * to DLT_NULL, which is what's used for loopback devices on BSD.
933 static data_link_info_t *
934 create_data_link_info(int dlt)
936 data_link_info_t *data_link_info;
939 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
940 data_link_info->dlt = dlt;
941 text = pcap_datalink_val_to_name(dlt);
943 data_link_info->name = g_strdup(text);
945 data_link_info->name = g_strdup_printf("DLT %d", dlt);
946 text = pcap_datalink_val_to_description(dlt);
948 data_link_info->description = g_strdup(text);
950 data_link_info->description = NULL;
951 return data_link_info;
955 * Get the capabilities of a network device.
957 static if_capabilities_t *
958 get_if_capabilities(const char *devname, gboolean monitor_mode
959 #ifndef HAVE_PCAP_CREATE
964 if_capabilities_t *caps;
965 char errbuf[PCAP_ERRBUF_SIZE];
967 #ifdef HAVE_PCAP_CREATE
971 #ifdef HAVE_PCAP_LIST_DATALINKS
975 data_link_info_t *data_link_info;
978 * Allocate the interface capabilities structure.
980 caps = g_malloc(sizeof *caps);
982 #ifdef HAVE_PCAP_OPEN
983 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
984 caps->can_set_rfmon = FALSE;
987 *err_str = g_strdup(errbuf);
991 #elif defined(HAVE_PCAP_CREATE)
992 pch = pcap_create(devname, errbuf);
995 *err_str = g_strdup(errbuf);
999 status = pcap_can_set_rfmon(pch);
1002 if (status == PCAP_ERROR)
1003 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1006 *err_str = g_strdup(pcap_statustostr(status));
1012 caps->can_set_rfmon = FALSE;
1013 else if (status == 1) {
1014 caps->can_set_rfmon = TRUE;
1016 pcap_set_rfmon(pch, 1);
1018 if (err_str != NULL) {
1019 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1027 status = pcap_activate(pch);
1029 /* Error. We ignore warnings (status > 0). */
1030 if (err_str != NULL) {
1031 if (status == PCAP_ERROR)
1032 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1035 *err_str = g_strdup(pcap_statustostr(status));
1042 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1043 caps->can_set_rfmon = FALSE;
1045 if (err_str != NULL)
1046 *err_str = g_strdup(errbuf);
1051 deflt = get_pcap_linktype(pch, devname);
1052 #ifdef HAVE_PCAP_LIST_DATALINKS
1053 nlt = pcap_list_datalinks(pch, &linktypes);
1054 if (nlt == 0 || linktypes == NULL) {
1056 if (err_str != NULL)
1057 *err_str = NULL; /* an empty list doesn't mean an error */
1060 caps->data_link_types = NULL;
1061 for (i = 0; i < nlt; i++) {
1062 data_link_info = create_data_link_info(linktypes[i]);
1065 * XXX - for 802.11, make the most detailed 802.11
1066 * version the default, rather than the one the
1067 * device has as the default?
1069 if (linktypes[i] == deflt)
1070 caps->data_link_types = g_list_prepend(caps->data_link_types,
1073 caps->data_link_types = g_list_append(caps->data_link_types,
1076 #ifdef HAVE_PCAP_FREE_DATALINKS
1077 pcap_free_datalinks(linktypes);
1080 * In Windows, there's no guarantee that if you have a library
1081 * built with one version of the MSVC++ run-time library, and
1082 * it returns a pointer to allocated data, you can free that
1083 * data from a program linked with another version of the
1084 * MSVC++ run-time library.
1086 * This is not an issue on UN*X.
1088 * See the mail threads starting at
1090 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1094 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1097 #define xx_free free /* hack so checkAPIs doesn't complain */
1100 #endif /* HAVE_PCAP_FREE_DATALINKS */
1101 #else /* HAVE_PCAP_LIST_DATALINKS */
1103 data_link_info = create_data_link_info(deflt);
1104 caps->data_link_types = g_list_append(caps->data_link_types,
1106 #endif /* HAVE_PCAP_LIST_DATALINKS */
1110 if (err_str != NULL)
1115 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1117 print_machine_readable_interfaces(GList *if_list)
1124 char addr_str[ADDRSTRLEN];
1126 if (capture_child) {
1127 /* Let our parent know we succeeded. */
1128 pipe_write_block(2, SP_SUCCESS, NULL);
1131 i = 1; /* Interface id number */
1132 for (if_entry = g_list_first(if_list); if_entry != NULL;
1133 if_entry = g_list_next(if_entry)) {
1134 if_info = (if_info_t *)if_entry->data;
1135 printf("%d. %s", i++, if_info->name);
1138 * Print the contents of the if_entry struct in a parseable format.
1139 * Each if_entry element is tab-separated. Addresses are comma-
1142 /* XXX - Make sure our description doesn't contain a tab */
1143 if (if_info->description != NULL)
1144 printf("\t%s\t", if_info->description);
1148 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1149 addr = g_slist_next(addr)) {
1150 if (addr != g_slist_nth(if_info->addrs, 0))
1153 if_addr = (if_addr_t *)addr->data;
1154 switch(if_addr->ifat_type) {
1156 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1158 printf("%s", addr_str);
1160 printf("<unknown IPv4>");
1164 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1165 addr_str, ADDRSTRLEN)) {
1166 printf("%s", addr_str);
1168 printf("<unknown IPv6>");
1172 printf("<type unknown %u>", if_addr->ifat_type);
1176 if (if_info->loopback)
1177 printf("\tloopback");
1179 printf("\tnetwork");
1186 * If you change the machine-readable output format of this function,
1187 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1190 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1193 data_link_info_t *data_link_info;
1194 const gchar *desc_str;
1196 if (capture_child) {
1197 /* Let our parent know we succeeded. */
1198 pipe_write_block(2, SP_SUCCESS, NULL);
1201 if (caps->can_set_rfmon)
1205 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1206 lt_entry = g_list_next(lt_entry)) {
1207 data_link_info = (data_link_info_t *)lt_entry->data;
1208 if (data_link_info->description != NULL)
1209 desc_str = data_link_info->description;
1211 desc_str = "(not supported)";
1212 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1222 /* Print the number of packets captured for each interface until we're killed. */
1224 print_statistics_loop(gboolean machine_readable)
1226 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1232 char errbuf[PCAP_ERRBUF_SIZE];
1233 struct pcap_stat ps;
1235 if_list = get_interface_list(&err, &err_str);
1236 if (if_list == NULL) {
1238 case CANT_GET_INTERFACE_LIST:
1239 cmdarg_err("%s", err_str);
1243 case NO_INTERFACES_FOUND:
1244 cmdarg_err("There are no interfaces on which a capture can be done");
1250 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1251 if_info = (if_info_t *)if_entry->data;
1252 #ifdef HAVE_PCAP_OPEN
1253 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1255 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1259 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1260 if_stat->name = g_strdup(if_info->name);
1262 stat_list = g_list_append(stat_list, if_stat);
1267 cmdarg_err("There are no interfaces on which a capture can be done");
1271 if (capture_child) {
1272 /* Let our parent know we succeeded. */
1273 pipe_write_block(2, SP_SUCCESS, NULL);
1276 if (!machine_readable) {
1277 printf("%-15s %10s %10s\n", "Interface", "Received",
1281 global_ld.go = TRUE;
1282 while (global_ld.go) {
1283 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1284 if_stat = (if_stat_t *)stat_entry->data;
1285 pcap_stats(if_stat->pch, &ps);
1287 if (!machine_readable) {
1288 printf("%-15s %10u %10u\n", if_stat->name,
1289 ps.ps_recv, ps.ps_drop);
1291 printf("%s\t%u\t%u\n", if_stat->name,
1292 ps.ps_recv, ps.ps_drop);
1303 /* XXX - Not reached. Should we look for 'q' in stdin? */
1304 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1305 if_stat = (if_stat_t *)stat_entry->data;
1306 pcap_close(if_stat->pch);
1307 g_free(if_stat->name);
1310 g_list_free(stat_list);
1311 free_interface_list(if_list);
1319 capture_cleanup_handler(DWORD dwCtrlType)
1321 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1322 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1323 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1324 like SIGTERM at least when the machine's shutting down.
1326 For now, if we're running as a command rather than a capture child,
1327 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1328 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1329 in that way on UN*X.
1331 If we're not running as a capture child, we might be running as
1332 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1333 user logs out. (XXX - can we explicitly check whether we're
1334 running as a service?) */
1336 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1337 "Console: Control signal");
1338 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1339 "Console: Control signal, CtrlType: %u", dwCtrlType);
1341 /* Keep capture running if we're a service and a user logs off */
1342 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1343 capture_loop_stop();
1351 capture_cleanup_handler(int signum _U_)
1353 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1354 SIGTERM. We assume that if the user wanted it to keep running
1355 after they logged out, they'd have nohupped it. */
1357 /* Note: don't call g_log() in the signal handler: if we happened to be in
1358 * g_log() in process context when the signal came in, g_log will detect
1359 * the "recursion" and abort.
1362 capture_loop_stop();
1368 report_capture_count(void)
1370 /* Don't print this if we're a capture child. */
1371 if (!capture_child) {
1373 /* Report the count only if we aren't printing a packet count
1374 as packets arrive. */
1375 fprintf(stderr, "Packets captured: %u\n", global_ld.packet_count);
1376 /* stderr could be line buffered */
1385 report_counts_for_siginfo(void)
1387 report_capture_count();
1388 infoprint = FALSE; /* we just reported it */
1392 report_counts_siginfo(int signum _U_)
1394 int sav_errno = errno;
1396 /* If we've been told to delay printing, just set a flag asking
1397 that we print counts (if we're supposed to), otherwise print
1398 the count of packets captured (if we're supposed to). */
1402 report_counts_for_siginfo();
1405 #endif /* SIGINFO */
1408 exit_main(int status)
1411 /* Shutdown windows sockets */
1414 /* can be helpful for debugging */
1415 #ifdef DEBUG_DUMPCAP
1416 printf("Press any key\n");
1427 * If we were linked with libcap (not libpcap), make sure we have
1428 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1429 * (See comment in main() for details)
1432 relinquish_privs_except_capture(void)
1434 /* If 'started_with_special_privs' (ie: suid) then enable for
1435 * ourself the NET_ADMIN and NET_RAW capabilities and then
1436 * drop our suid privileges.
1438 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1439 * stuff we don't need (and shouldn't have).
1440 * CAP_NET_RAW: Packet capture (raw sockets).
1443 if (started_with_special_privs()) {
1444 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1445 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1447 cap_t caps = cap_init(); /* all capabilities initialized to off */
1449 print_caps("Pre drop, pre set");
1451 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1452 cmdarg_err("prctl() fail return: %s", strerror(errno));
1455 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1456 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1458 if (cap_set_proc(caps)) {
1459 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1461 print_caps("Pre drop, post set");
1463 relinquish_special_privs_perm();
1465 print_caps("Post drop, pre set");
1466 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1467 if (cap_set_proc(caps)) {
1468 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1470 print_caps("Post drop, post set");
1476 #endif /* HAVE_LIBCAP */
1478 /* Take care of byte order in the libpcap headers read from pipes.
1479 * (function taken from wiretap/libpcap.c) */
1481 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1484 /* Byte-swap the record header fields. */
1485 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1486 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1487 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1488 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1491 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1492 swapped, in order to match the BPF header layout.
1494 Unfortunately, some files were, according to a comment in the "libpcap"
1495 source, written with version 2.3 in their headers but without the
1496 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1497 would make no sense - we assume that we need to swap them. */
1498 if (hdr->version_major == 2 &&
1499 (hdr->version_minor < 3 ||
1500 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1503 temp = rechdr->orig_len;
1504 rechdr->orig_len = rechdr->incl_len;
1505 rechdr->incl_len = temp;
1511 * Thread function that reads from a pipe and pushes the data
1512 * to the main application thread.
1515 * XXX Right now we use async queues for basic signaling. The main thread
1516 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1517 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1518 * Iff the read is successful cap_pipe_read pushes an item onto
1519 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1520 * the queues themselves (yet).
1522 * We might want to move some of the cap_pipe_dispatch logic here so that
1523 * we can let cap_pipe_read run independently, queuing up multiple reads
1524 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1526 static void *cap_pipe_read(void *arg)
1528 pcap_options *pcap_opts = (pcap_options *)arg;
1537 while (pcap_opts->cap_pipe_err == PIPOK) {
1538 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1539 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1541 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1543 /* If we try to use read() on a named pipe on Windows with partial
1544 * data it appears to return EOF.
1546 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1547 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1552 last_err = GetLastError();
1553 if (last_err == ERROR_MORE_DATA) {
1555 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1556 pcap_opts->cap_pipe_err = PIPEOF;
1560 pcap_opts->cap_pipe_err = PIPERR;
1563 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1564 pcap_opts->cap_pipe_err = PIPEOF;
1569 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1570 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1573 pcap_opts->cap_pipe_err = PIPEOF;
1577 pcap_opts->cap_pipe_err = PIPERR;
1586 pcap_opts->cap_pipe_bytes_read = bytes_read;
1587 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1588 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1590 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1594 #endif /* USE_THREADS */
1596 /* Provide select() functionality for a single file descriptor
1597 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1599 * Returns the same values as select. If an error is returned,
1600 * the string cap_pipe_err_str should be used instead of errno.
1603 cap_pipe_select(int pipe_fd)
1606 struct timeval timeout;
1609 cap_pipe_err_str = "Unknown error";
1612 FD_SET(pipe_fd, &rfds);
1614 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1615 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1617 sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1619 cap_pipe_err_str = strerror(errno);
1624 /* Mimic pcap_open_live() for pipe captures
1626 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1627 * open it, and read the header.
1629 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1630 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1632 cap_pipe_open_live(char *pipename,
1633 pcap_options *pcap_opts,
1634 struct pcap_hdr *hdr,
1635 char *errmsg, int errmsgl)
1638 ws_statb64 pipe_stat;
1639 struct sockaddr_un sa;
1650 unsigned int bytes_read;
1655 pcap_opts->cap_pipe_fd = -1;
1657 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1659 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1662 * XXX - this blocks until a pcap per-file header has been written to
1663 * the pipe, so it could block indefinitely.
1665 if (strcmp(pipename, "-") == 0) {
1667 fd = 0; /* read from stdin */
1669 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1673 if (ws_stat64(pipename, &pipe_stat) < 0) {
1674 if (errno == ENOENT || errno == ENOTDIR)
1675 pcap_opts->cap_pipe_err = PIPNEXIST;
1677 g_snprintf(errmsg, errmsgl,
1678 "The capture session could not be initiated "
1679 "due to error getting information on pipe/socket: %s", strerror(errno));
1680 pcap_opts->cap_pipe_err = PIPERR;
1684 if (S_ISFIFO(pipe_stat.st_mode)) {
1685 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1687 g_snprintf(errmsg, errmsgl,
1688 "The capture session could not be initiated "
1689 "due to error on pipe open: %s", strerror(errno));
1690 pcap_opts->cap_pipe_err = PIPERR;
1693 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1694 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1696 g_snprintf(errmsg, errmsgl,
1697 "The capture session could not be initiated "
1698 "due to error on socket create: %s", strerror(errno));
1699 pcap_opts->cap_pipe_err = PIPERR;
1702 sa.sun_family = AF_UNIX;
1704 * The Single UNIX Specification says:
1706 * The size of sun_path has intentionally been left undefined.
1707 * This is because different implementations use different sizes.
1708 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1709 * of 104. Since most implementations originate from BSD versions,
1710 * the size is typically in the range 92 to 108.
1712 * Applications should not assume a particular length for sun_path
1713 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1717 * The <sys/un.h> header shall define the sockaddr_un structure,
1718 * which shall include at least the following members:
1720 * sa_family_t sun_family Address family.
1721 * char sun_path[] Socket pathname.
1723 * so we assume that it's an array, with a specified size,
1724 * and that the size reflects the maximum path length.
1726 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1727 /* Path name too long */
1728 g_snprintf(errmsg, errmsgl,
1729 "The capture session coud not be initiated "
1730 "due to error on socket connect: Path name too long");
1731 pcap_opts->cap_pipe_err = PIPERR;
1734 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1736 g_snprintf(errmsg, errmsgl,
1737 "The capture session coud not be initiated "
1738 "due to error on socket connect: %s", strerror(errno));
1739 pcap_opts->cap_pipe_err = PIPERR;
1743 if (S_ISCHR(pipe_stat.st_mode)) {
1745 * Assume the user specified an interface on a system where
1746 * interfaces are in /dev. Pretend we haven't seen it.
1748 pcap_opts->cap_pipe_err = PIPNEXIST;
1751 g_snprintf(errmsg, errmsgl,
1752 "The capture session could not be initiated because\n"
1753 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1754 pcap_opts->cap_pipe_err = PIPERR;
1759 #define PIPE_STR "\\pipe\\"
1760 /* Under Windows, named pipes _must_ have the form
1761 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1763 pncopy = g_strdup(pipename);
1764 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1765 pos = strchr(pncopy + 3, '\\');
1766 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1773 g_snprintf(errmsg, errmsgl,
1774 "The capture session could not be initiated because\n"
1775 "\"%s\" is neither an interface nor a pipe", pipename);
1776 pcap_opts->cap_pipe_err = PIPNEXIST;
1780 /* Wait for the pipe to appear */
1782 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1783 OPEN_EXISTING, 0, NULL);
1785 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1788 if (GetLastError() != ERROR_PIPE_BUSY) {
1789 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1790 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1791 g_snprintf(errmsg, errmsgl,
1792 "The capture session on \"%s\" could not be started "
1793 "due to error on pipe open: %s (error %d)",
1794 pipename, utf_16to8(err_str), GetLastError());
1796 pcap_opts->cap_pipe_err = PIPERR;
1800 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1801 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1802 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1803 g_snprintf(errmsg, errmsgl,
1804 "The capture session on \"%s\" timed out during "
1805 "pipe open: %s (error %d)",
1806 pipename, utf_16to8(err_str), GetLastError());
1808 pcap_opts->cap_pipe_err = PIPERR;
1815 pcap_opts->from_cap_pipe = TRUE;
1818 /* read the pcap header */
1820 while (bytes_read < sizeof magic) {
1821 sel_ret = cap_pipe_select(fd);
1823 g_snprintf(errmsg, errmsgl,
1824 "Unexpected error from select: %s", strerror(errno));
1826 } else if (sel_ret > 0) {
1827 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1830 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1832 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1839 #else /* USE_THREADS */
1840 g_thread_create(&cap_pipe_read, &pcap_opts, FALSE, NULL);
1842 pcap_opts->cap_pipe_buf = (char *) &magic;
1843 pcap_opts->cap_pipe_bytes_read = 0;
1844 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1845 /* We don't have to worry about cap_pipe_read_mtx here */
1846 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1847 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1848 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1849 if (pcap_opts->cap_pipe_bytes_read == 0)
1850 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1852 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1857 #endif /* USE_THREADS */
1861 /* Host that wrote it has our byte order, and was running
1862 a program using either standard or ss990417 libpcap. */
1863 pcap_opts->cap_pipe_byte_swapped = FALSE;
1864 pcap_opts->cap_pipe_modified = FALSE;
1866 case PCAP_MODIFIED_MAGIC:
1867 /* Host that wrote it has our byte order, but was running
1868 a program using either ss990915 or ss991029 libpcap. */
1869 pcap_opts->cap_pipe_byte_swapped = FALSE;
1870 pcap_opts->cap_pipe_modified = TRUE;
1872 case PCAP_SWAPPED_MAGIC:
1873 /* Host that wrote it has a byte order opposite to ours,
1874 and was running a program using either standard or
1875 ss990417 libpcap. */
1876 pcap_opts->cap_pipe_byte_swapped = TRUE;
1877 pcap_opts->cap_pipe_modified = FALSE;
1879 case PCAP_SWAPPED_MODIFIED_MAGIC:
1880 /* Host that wrote it out has a byte order opposite to
1881 ours, and was running a program using either ss990915
1882 or ss991029 libpcap. */
1883 pcap_opts->cap_pipe_byte_swapped = TRUE;
1884 pcap_opts->cap_pipe_modified = TRUE;
1887 /* Not a "libpcap" type we know about. */
1888 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1893 /* Read the rest of the header */
1895 while (bytes_read < sizeof(struct pcap_hdr)) {
1896 sel_ret = cap_pipe_select(fd);
1898 g_snprintf(errmsg, errmsgl,
1899 "Unexpected error from select: %s", strerror(errno));
1901 } else if (sel_ret > 0) {
1902 b = read(fd, ((char *)hdr)+bytes_read,
1903 sizeof(struct pcap_hdr) - bytes_read);
1906 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1908 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1915 #else /* USE_THREADS */
1916 pcap_opts->cap_pipe_buf = (char *) hdr;
1917 pcap_opts->cap_pipe_bytes_read = 0;
1918 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1919 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1920 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1921 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1922 if (pcap_opts->cap_pipe_bytes_read == 0)
1923 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1925 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1929 #endif /* USE_THREADS */
1931 if (pcap_opts->cap_pipe_byte_swapped) {
1932 /* Byte-swap the header fields about which we care. */
1933 hdr->version_major = BSWAP16(hdr->version_major);
1934 hdr->version_minor = BSWAP16(hdr->version_minor);
1935 hdr->snaplen = BSWAP32(hdr->snaplen);
1936 hdr->network = BSWAP32(hdr->network);
1938 pcap_opts->linktype = hdr->network;
1940 if (hdr->version_major < 2) {
1941 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1945 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1946 pcap_opts->cap_pipe_err = PIPOK;
1948 pcap_opts->cap_pipe_fd = fd;
1953 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1954 pcap_opts->cap_pipe_err = PIPERR;
1957 pcap_opts->cap_pipe_fd = -1;
1964 /* We read one record from the pipe, take care of byte order in the record
1965 * header, write the record to the capture file, and update capture statistics. */
1967 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
1969 struct pcap_pkthdr phdr;
1970 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1982 #ifdef LOG_CAPTURE_VERBOSE
1983 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
1986 switch (pcap_opts->cap_pipe_state) {
1988 case STATE_EXPECT_REC_HDR:
1990 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
1993 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
1994 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
1995 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
1996 pcap_opts->cap_pipe_bytes_read = 0;
1999 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2000 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2001 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2006 case STATE_READ_REC_HDR:
2008 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2009 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2012 result = PD_PIPE_EOF;
2014 result = PD_PIPE_ERR;
2017 pcap_opts->cap_pipe_bytes_read += b;
2018 #else /* USE_THREADS */
2019 g_get_current_time(&wait_time);
2020 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2021 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2022 if (pcap_opts->cap_pipe_err == PIPEOF) {
2023 result = PD_PIPE_EOF;
2025 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2026 result = PD_PIPE_ERR;
2032 #endif /* USE_THREADS */
2033 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2035 result = PD_REC_HDR_READ;
2038 case STATE_EXPECT_DATA:
2040 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2043 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2044 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2045 pcap_opts->cap_pipe_bytes_read = 0;
2048 pcap_opts->cap_pipe_buf = (char *) data;
2049 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2050 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2055 case STATE_READ_DATA:
2057 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2058 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2061 result = PD_PIPE_EOF;
2063 result = PD_PIPE_ERR;
2066 pcap_opts->cap_pipe_bytes_read += b;
2067 #else /* USE_THREADS */
2068 g_get_current_time(&wait_time);
2069 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2070 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2071 if (pcap_opts->cap_pipe_err == PIPEOF) {
2072 result = PD_PIPE_EOF;
2074 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2075 result = PD_PIPE_ERR;
2081 #endif /* USE_THREADS */
2082 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2084 result = PD_DATA_READ;
2088 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2091 } /* switch (ld->cap_pipe_state) */
2094 * We've now read as much data as we were expecting, so process it.
2098 case PD_REC_HDR_READ:
2099 /* We've read the header. Take care of byte order. */
2100 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2101 &pcap_opts->cap_pipe_rechdr.hdr);
2102 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2103 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2104 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2107 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2111 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2112 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2113 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2114 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2115 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2117 capture_loop_packet_cb((u_char *)ld, &phdr, data);
2119 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2123 pcap_opts->cap_pipe_err = PIPEOF;
2128 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2129 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2130 g_snprintf(errmsg, errmsgl,
2131 "Error reading from pipe: %s (error %d)",
2132 utf_16to8(err_str), GetLastError());
2135 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2143 pcap_opts->cap_pipe_err = PIPERR;
2144 /* Return here rather than inside the switch to prevent GCC warning */
2149 /** Open the capture input file (pcap or capture pipe).
2150 * Returns TRUE if it succeeds, FALSE otherwise. */
2152 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2153 char *errmsg, size_t errmsg_len,
2154 char *secondary_errmsg, size_t secondary_errmsg_len)
2156 gchar open_err_str[PCAP_ERRBUF_SIZE];
2157 gchar *sync_msg_str;
2158 interface_options interface_opts;
2159 pcap_options pcap_opts;
2163 gchar *sync_secondary_msg_str;
2164 WORD wVersionRequested;
2168 /* XXX - opening Winsock on tshark? */
2170 /* Initialize Windows Socket if we are in a WIN32 OS
2171 This needs to be done before querying the interface for network/netmask */
2173 /* XXX - do we really require 1.1 or earlier?
2174 Are there any versions that support only 2.0 or higher? */
2175 wVersionRequested = MAKEWORD(1, 1);
2176 err = WSAStartup(wVersionRequested, &wsaData);
2180 case WSASYSNOTREADY:
2181 g_snprintf(errmsg, (gulong) errmsg_len,
2182 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2185 case WSAVERNOTSUPPORTED:
2186 g_snprintf(errmsg, (gulong) errmsg_len,
2187 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2188 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2191 case WSAEINPROGRESS:
2192 g_snprintf(errmsg, (gulong) errmsg_len,
2193 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2197 g_snprintf(errmsg, (gulong) errmsg_len,
2198 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2202 g_snprintf(errmsg, (gulong) errmsg_len,
2203 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2207 g_snprintf(errmsg, (gulong) errmsg_len,
2208 "Couldn't initialize Windows Sockets: error %d", err);
2211 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2215 for (i = 0; i < capture_opts->ifaces->len; i++) {
2216 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2217 pcap_opts.pcap_h = NULL;
2218 #ifdef MUST_DO_SELECT
2219 pcap_opts.pcap_fd = -1;
2221 pcap_opts.pcap_err = FALSE;
2222 pcap_opts.interface_id = i;
2223 pcap_opts.tid = NULL;
2224 pcap_opts.snaplen = 0;
2225 pcap_opts.linktype = -1;
2226 pcap_opts.from_cap_pipe = FALSE;
2227 memset(&pcap_opts.cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2228 memset(&pcap_opts.cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2230 pcap_opts.cap_pipe_h = INVALID_HANDLE_VALUE;
2232 pcap_opts.cap_pipe_fd = -1;
2234 pcap_opts.cap_pipe_modified = FALSE;
2235 pcap_opts.cap_pipe_byte_swapped = FALSE;
2237 pcap_opts.cap_pipe_buf = NULL;
2238 #endif /* USE_THREADS */
2239 pcap_opts.cap_pipe_bytes_to_read = 0;
2240 pcap_opts.cap_pipe_bytes_read = 0;
2241 pcap_opts.cap_pipe_state = 0;
2242 pcap_opts.cap_pipe_err = PIPOK;
2244 pcap_opts.cap_pipe_read_mtx = g_mutex_new();
2245 pcap_opts.cap_pipe_pending_q = g_async_queue_new();
2246 pcap_opts.cap_pipe_done_q = g_async_queue_new();
2249 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2250 pcap_opts.pcap_h = open_capture_device(&interface_opts, &open_err_str);
2252 if (pcap_opts.pcap_h != NULL) {
2253 /* we've opened "iface" as a network device */
2255 /* try to set the capture buffer size */
2256 if (interface_opts.buffer_size > 1 &&
2257 pcap_setbuff(pcap_opts.pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2258 sync_secondary_msg_str = g_strdup_printf(
2259 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2260 "the default of 1MB will be used.\n"
2262 "Nonetheless, the capture is started.\n",
2263 interface_opts.buffer_size);
2264 report_capture_error("Couldn't set the capture buffer size!",
2265 sync_secondary_msg_str);
2266 g_free(sync_secondary_msg_str);
2270 #if defined(HAVE_PCAP_SETSAMPLING)
2271 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2272 struct pcap_samp *samp;
2274 if ((samp = pcap_setsampling(pcap_opts.pcap_h)) != NULL) {
2275 switch (interface_opts.sampling_method) {
2276 case CAPTURE_SAMP_BY_COUNT:
2277 samp->method = PCAP_SAMP_1_EVERY_N;
2280 case CAPTURE_SAMP_BY_TIMER:
2281 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2285 sync_msg_str = g_strdup_printf(
2286 "Unknown sampling method %d specified,\n"
2287 "continue without packet sampling",
2288 interface_opts.sampling_method);
2289 report_capture_error("Couldn't set the capture "
2290 "sampling", sync_msg_str);
2291 g_free(sync_msg_str);
2293 samp->value = interface_opts.sampling_param;
2295 report_capture_error("Couldn't set the capture sampling",
2296 "Cannot get packet sampling data structure");
2302 /* setting the data link type only works on real interfaces */
2303 if (!set_pcap_linktype(pcap_opts.pcap_h, interface_opts.linktype, interface_opts.name,
2305 secondary_errmsg, secondary_errmsg_len)) {
2306 g_array_append_val(ld->pcaps, pcap_opts);
2309 pcap_opts.linktype = get_pcap_linktype(pcap_opts.pcap_h, interface_opts.name);
2311 /* We couldn't open "iface" as a network device. */
2312 /* Try to open it as a pipe */
2313 cap_pipe_open_live(interface_opts.name, &pcap_opts, &pcap_opts.cap_pipe_hdr, errmsg, (int) errmsg_len);
2316 if (pcap_opts.cap_pipe_fd == -1) {
2318 if (pcap_opts.cap_pipe_h == INVALID_HANDLE_VALUE) {
2320 if (pcap_opts.cap_pipe_err == PIPNEXIST) {
2321 /* Pipe doesn't exist, so output message for interface */
2322 get_capture_device_open_failure_messages(open_err_str,
2323 interface_opts.name,
2327 secondary_errmsg_len);
2330 * Else pipe (or file) does exist and cap_pipe_open_live() has
2333 g_array_append_val(ld->pcaps, pcap_opts);
2336 /* cap_pipe_open_live() succeeded; don't want
2337 error message from pcap_open_live() */
2338 open_err_str[0] = '\0';
2342 /* XXX - will this work for tshark? */
2343 #ifdef MUST_DO_SELECT
2344 if (!pcap_opts.from_cap_pipe) {
2345 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2346 pcap_opts.pcap_fd = pcap_get_selectable_fd(pcap_opts.pcap_h);
2348 pcap_opts.pcap_fd = pcap_fileno(pcap_opts.pcap_h);
2353 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2354 returned a warning; print it, but keep capturing. */
2355 if (open_err_str[0] != '\0') {
2356 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2357 report_capture_error(sync_msg_str, "");
2358 g_free(sync_msg_str);
2360 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2361 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2362 g_array_append_val(ld->pcaps, pcap_opts);
2368 /* close the capture input file (pcap or capture pipe) */
2369 static void capture_loop_close_input(loop_data *ld)
2372 pcap_options pcap_opts;
2374 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2376 for (i = 0; i < ld->pcaps->len; i++) {
2377 pcap_opts = g_array_index(ld->pcaps, pcap_options, i);
2378 /* if open, close the capture pipe "input file" */
2380 if (pcap_opts.cap_pipe_fd >= 0) {
2381 g_assert(pcap_opts.from_cap_pipe);
2382 ws_close(pcap_opts.cap_pipe_fd);
2383 pcap_opts.cap_pipe_fd = -1;
2386 if (pcap_opts.cap_pipe_h != INVALID_HANDLE_VALUE) {
2387 CloseHandle(pcap_opts.cap_pipe_h);
2388 pcap_opts.cap_pipe_h = INVALID_HANDLE_VALUE;
2391 /* if open, close the pcap "input file" */
2392 if (pcap_opts.pcap_h != NULL) {
2393 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", pcap_opts.pcap_h);
2394 pcap_close(pcap_opts.pcap_h);
2395 pcap_opts.pcap_h = NULL;
2402 /* Shut down windows sockets */
2408 /* init the capture filter */
2409 static initfilter_status_t
2410 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2411 gchar * name, gchar * cfilter)
2413 struct bpf_program fcode;
2415 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2417 /* capture filters only work on real interfaces */
2418 if (cfilter && !from_cap_pipe) {
2419 /* A capture filter was specified; set it up. */
2420 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2421 /* Treat this specially - our caller might try to compile this
2422 as a display filter and, if that succeeds, warn the user that
2423 the display and capture filter syntaxes are different. */
2424 return INITFILTER_BAD_FILTER;
2426 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2427 #ifdef HAVE_PCAP_FREECODE
2428 pcap_freecode(&fcode);
2430 return INITFILTER_OTHER_ERROR;
2432 #ifdef HAVE_PCAP_FREECODE
2433 pcap_freecode(&fcode);
2437 return INITFILTER_NO_ERROR;
2441 /* set up to write to the already-opened capture output file/files */
2443 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2447 pcap_options pcap_opts;
2448 interface_options interface_opts;
2449 gboolean successful;
2451 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2453 if ((capture_opts->use_pcapng == FALSE) &&
2454 (capture_opts->ifaces->len > 1)) {
2455 g_snprintf(errmsg, errmsg_len,
2456 "Using PCAPNG is required for capturing on mulitple interfaces! Use the -n option.");
2460 /* Set up to write to the capture file. */
2461 if (capture_opts->multi_files_on) {
2462 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2464 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2467 if (capture_opts->use_pcapng) {
2470 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2471 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err);
2472 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2473 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2474 pcap_opts = g_array_index(ld->pcaps, pcap_options, i);
2475 if (pcap_opts.from_cap_pipe) {
2476 pcap_opts.snaplen = pcap_opts.cap_pipe_hdr.snaplen;
2478 pcap_opts.snaplen = pcap_snapshot(pcap_opts.pcap_h);
2480 successful = libpcap_write_interface_description_block(ld->pdh,
2481 interface_opts.name,
2482 interface_opts.cfilter,
2489 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2490 pcap_opts = g_array_index(ld->pcaps, pcap_options, 0);
2491 if (pcap_opts.from_cap_pipe) {
2492 pcap_opts.snaplen = pcap_opts.cap_pipe_hdr.snaplen;
2494 pcap_opts.snaplen = pcap_snapshot(pcap_opts.pcap_h);
2496 successful = libpcap_write_file_header(ld->pdh, pcap_opts.linktype, pcap_opts.snaplen,
2497 &ld->bytes_written, &err);
2505 if (ld->pdh == NULL) {
2506 /* We couldn't set up to write to the capture file. */
2507 /* XXX - use cf_open_error_message from tshark instead? */
2512 g_snprintf(errmsg, errmsg_len,
2513 "The file to which the capture would be"
2514 " saved (\"%s\") could not be opened: Error %d.",
2515 capture_opts->save_file, err);
2517 g_snprintf(errmsg, errmsg_len,
2518 "The file to which the capture would be"
2519 " saved (\"%s\") could not be opened: %s.",
2520 capture_opts->save_file, strerror(err));
2532 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2536 pcap_options pcap_opts;
2538 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2540 if (capture_opts->multi_files_on) {
2541 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2543 if (capture_opts->use_pcapng) {
2544 for (i = 0; i < global_ld.pcaps->len; i++) {
2545 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2546 if (!pcap_opts.from_cap_pipe) {
2547 libpcap_write_interface_statistics_block(ld->pdh, i, pcap_opts.pcap_h, &ld->bytes_written, err_close);
2551 return libpcap_dump_close(ld->pdh, err_close);
2555 /* dispatch incoming packets (pcap or capture pipe)
2557 * Waits for incoming packets to be available, and calls pcap_dispatch()
2558 * to cause them to be processed.
2560 * Returns the number of packets which were processed.
2562 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2563 * packet-batching behaviour does not cause packets to get held back
2567 capture_loop_dispatch(capture_options *capture_opts _U_, loop_data *ld,
2568 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2571 gint packet_count_before;
2572 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2577 packet_count_before = ld->packet_count;
2578 if (pcap_opts->from_cap_pipe) {
2579 /* dispatch from capture pipe */
2580 #ifdef LOG_CAPTURE_VERBOSE
2581 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2584 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2586 if (sel_ret < 0 && errno != EINTR) {
2587 g_snprintf(errmsg, errmsg_len,
2588 "Unexpected error from select: %s", strerror(errno));
2589 report_capture_error(errmsg, please_report);
2594 * "select()" says we can read from the pipe without blocking
2596 #endif /* USE_THREADS */
2597 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2607 /* dispatch from pcap */
2608 #ifdef MUST_DO_SELECT
2610 * If we have "pcap_get_selectable_fd()", we use it to get the
2611 * descriptor on which to select; if that's -1, it means there
2612 * is no descriptor on which you can do a "select()" (perhaps
2613 * because you're capturing on a special device, and that device's
2614 * driver unfortunately doesn't support "select()", in which case
2615 * we don't do the select - which means it might not be possible
2616 * to stop a capture until a packet arrives. If that's unacceptable,
2617 * plead with whoever supplies the software for that device to add
2618 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2619 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2620 * later, so it can use pcap_breakloop().
2622 #ifdef LOG_CAPTURE_VERBOSE
2623 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2625 if (pcap_opts->pcap_fd != -1) {
2626 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2629 * "select()" says we can read from it without blocking; go for
2632 * We don't have pcap_breakloop(), so we only process one packet
2633 * per pcap_dispatch() call, to allow a signal to stop the
2634 * processing immediately, rather than processing all packets
2635 * in a batch before quitting.
2637 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_packet_cb,
2638 (u_char *)&(pcap_opts->interface_id));
2641 /* Error, rather than pcap_breakloop(). */
2642 pcap_opts->pcap_err = TRUE;
2644 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2647 if (sel_ret < 0 && errno != EINTR) {
2648 g_snprintf(errmsg, errmsg_len,
2649 "Unexpected error from select: %s", strerror(errno));
2650 report_capture_error(errmsg, please_report);
2656 #endif /* MUST_DO_SELECT */
2658 /* dispatch from pcap without select */
2660 #ifdef LOG_CAPTURE_VERBOSE
2661 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2665 * On Windows, we don't support asynchronously telling a process to
2666 * stop capturing; instead, we check for an indication on a pipe
2667 * after processing packets. We therefore process only one packet
2668 * at a time, so that we can check the pipe after every packet.
2670 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_packet_cb, (u_char *) ld);
2672 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_packet_cb, (u_char *) ld);
2676 /* Error, rather than pcap_breakloop(). */
2677 pcap_opts->pcap_err = TRUE;
2679 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2681 #else /* pcap_next_ex */
2682 #ifdef LOG_CAPTURE_VERBOSE
2683 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2685 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2688 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2689 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2690 * This should be fixed in the WinPcap 4.0 alpha release.
2692 * For reference, an example remote interface:
2693 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2696 /* emulate dispatch from pcap */
2699 struct pcap_pkthdr *pkt_header;
2704 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1)
2705 capture_loop_packet_cb( (u_char *) ld, pkt_header, pkt_data);
2708 pcap_opts->pcap_err = TRUE;
2712 #endif /* pcap_next_ex */
2716 #ifdef LOG_CAPTURE_VERBOSE
2717 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2720 return ld->packet_count - packet_count_before;
2724 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2725 * want to grab only the characters between the '{' and '}' delimiters.
2727 * Returns a GString that must be freed with g_string_free(). */
2729 isolate_uuid(const char *iface)
2734 ptr = strchr(iface, '{');
2736 return g_string_new(iface);
2737 gstr = g_string_new(ptr + 1);
2739 ptr = strchr(gstr->str, '}');
2743 gstr = g_string_truncate(gstr, ptr - gstr->str);
2748 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2749 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2751 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2752 char *errmsg, int errmsg_len)
2755 gchar *capfile_name;
2757 gboolean is_tempfile;
2759 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2760 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2762 if (capture_opts->save_file != NULL) {
2763 /* We return to the caller while the capture is in progress.
2764 * Therefore we need to take a copy of save_file in
2765 * case the caller destroys it after we return.
2767 capfile_name = g_strdup(capture_opts->save_file);
2769 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2770 if (capture_opts->multi_files_on) {
2771 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2772 g_snprintf(errmsg, errmsg_len,
2773 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2774 g_free(capfile_name);
2777 if (strcmp(capfile_name, "-") == 0) {
2778 /* write to stdout */
2781 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2782 _setmode(1, O_BINARY);
2785 } /* if (...output_to_pipe ... */
2788 if (capture_opts->multi_files_on) {
2789 /* ringbuffer is enabled */
2790 *save_file_fd = ringbuf_init(capfile_name,
2791 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2792 capture_opts->group_read_access);
2794 /* we need the ringbuf name */
2795 if(*save_file_fd != -1) {
2796 g_free(capfile_name);
2797 capfile_name = g_strdup(ringbuf_current_filename());
2800 /* Try to open/create the specified file for use as a capture buffer. */
2801 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2802 (capture_opts->group_read_access) ? 0640 : 0600);
2805 is_tempfile = FALSE;
2807 /* Choose a random name for the temporary capture buffer */
2811 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1).name);
2812 prefix = g_strconcat("wireshark_", g_basename(iface->str), NULL);
2813 g_string_free(iface, TRUE);
2815 prefix = g_strconcat("wireshark_", g_basename(g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1).name), NULL);
2817 *save_file_fd = create_tempfile(&tmpname, prefix);
2819 capfile_name = g_strdup(tmpname);
2823 /* did we fail to open the output file? */
2824 if (*save_file_fd == -1) {
2826 g_snprintf(errmsg, errmsg_len,
2827 "The temporary file to which the capture would be saved (\"%s\") "
2828 "could not be opened: %s.", capfile_name, strerror(errno));
2830 if (capture_opts->multi_files_on) {
2831 ringbuf_error_cleanup();
2834 g_snprintf(errmsg, errmsg_len,
2835 "The file to which the capture would be saved (\"%s\") "
2836 "could not be opened: %s.", capfile_name,
2839 g_free(capfile_name);
2843 if(capture_opts->save_file != NULL) {
2844 g_free(capture_opts->save_file);
2846 capture_opts->save_file = capfile_name;
2847 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2848 "g_free(capfile_name)". */
2854 /* Do the work of handling either the file size or file duration capture
2855 conditions being reached, and switching files or stopping. */
2857 do_file_switch_or_stop(capture_options *capture_opts,
2858 condition *cnd_autostop_files,
2859 condition *cnd_autostop_size,
2860 condition *cnd_file_duration)
2863 pcap_options pcap_opts;
2864 interface_options interface_opts;
2865 gboolean successful;
2867 if (capture_opts->multi_files_on) {
2868 if (cnd_autostop_files != NULL &&
2869 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2870 /* no files left: stop here */
2871 global_ld.go = FALSE;
2875 /* Switch to the next ringbuffer file */
2876 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2877 &global_ld.save_file_fd, &global_ld.err)) {
2879 /* File switch succeeded: reset the conditions */
2880 global_ld.bytes_written = 0;
2881 if (capture_opts->use_pcapng) {
2884 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2885 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &(global_ld.bytes_written), &global_ld.err);
2886 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2887 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2888 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2889 successful = libpcap_write_interface_description_block(global_ld.pdh,
2890 interface_opts.name,
2891 interface_opts.cfilter,
2894 &(global_ld.bytes_written),
2898 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2899 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, 0);
2900 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts.linktype, pcap_opts.snaplen,
2901 &global_ld.bytes_written, &global_ld.err);
2904 fclose(global_ld.pdh);
2905 global_ld.pdh = NULL;
2906 global_ld.go = FALSE;
2909 if (cnd_autostop_size)
2910 cnd_reset(cnd_autostop_size);
2911 if (cnd_file_duration)
2912 cnd_reset(cnd_file_duration);
2913 libpcap_dump_flush(global_ld.pdh, NULL);
2915 report_packet_count(global_ld.inpkts_to_sync_pipe);
2916 global_ld.inpkts_to_sync_pipe = 0;
2917 report_new_capture_file(capture_opts->save_file);
2919 /* File switch failed: stop here */
2920 global_ld.go = FALSE;
2924 /* single file, stop now */
2925 global_ld.go = FALSE;
2931 /* Do the low-level work of a capture.
2932 Returns TRUE if it succeeds, FALSE otherwise. */
2934 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
2937 time_t upd_time, cur_time;
2939 struct timeval upd_time, cur_time;
2943 condition *cnd_file_duration = NULL;
2944 condition *cnd_autostop_files = NULL;
2945 condition *cnd_autostop_size = NULL;
2946 condition *cnd_autostop_duration = NULL;
2949 gboolean cfilter_error = FALSE;
2950 char errmsg[MSG_MAX_LENGTH+1];
2951 char secondary_errmsg[MSG_MAX_LENGTH+1];
2952 pcap_options pcap_opts;
2953 interface_options interface_opts;
2956 interface_opts = capture_opts->default_options;
2958 *secondary_errmsg = '\0';
2960 /* init the loop data */
2961 global_ld.go = TRUE;
2962 global_ld.packet_count = 0;
2964 global_ld.report_packet_count = FALSE;
2966 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options));
2967 if (capture_opts->has_autostop_packets)
2968 global_ld.packet_max = capture_opts->autostop_packets;
2970 global_ld.packet_max = 0; /* no limit */
2971 global_ld.inpkts_to_sync_pipe = 0;
2972 global_ld.err = 0; /* no error seen yet */
2973 global_ld.pdh = NULL;
2974 global_ld.autostop_files = 0;
2975 global_ld.save_file_fd = -1;
2977 /* We haven't yet gotten the capture statistics. */
2978 *stats_known = FALSE;
2980 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
2981 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
2983 /* open the "input file" from network interface or capture pipe */
2984 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
2985 secondary_errmsg, sizeof(secondary_errmsg))) {
2988 for (i = 0; i < capture_opts->ifaces->len; i++) {
2989 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2990 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2991 /* init the input filter from the network interface (capture pipe will do nothing) */
2992 switch (capture_loop_init_filter(pcap_opts.pcap_h, pcap_opts.from_cap_pipe,
2993 interface_opts.name,
2994 interface_opts.cfilter)) {
2996 case INITFILTER_NO_ERROR:
2999 case INITFILTER_BAD_FILTER:
3000 cfilter_error = TRUE;
3001 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts.pcap_h));
3004 case INITFILTER_OTHER_ERROR:
3005 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3006 pcap_geterr(pcap_opts.pcap_h));
3007 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3012 /* If we're supposed to write to a capture file, open it for output
3013 (temporary/specified name/ringbuffer) */
3014 if (capture_opts->saving_to_file) {
3015 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3016 errmsg, sizeof(errmsg))) {
3020 /* set up to write to the already-opened capture output file/files */
3021 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3026 /* XXX - capture SIGTERM and close the capture, in case we're on a
3027 Linux 2.0[.x] system and you have to explicitly close the capture
3028 stream in order to turn promiscuous mode off? We need to do that
3029 in other places as well - and I don't think that works all the
3030 time in any case, due to libpcap bugs. */
3032 /* Well, we should be able to start capturing.
3034 Sync out the capture file, so the header makes it to the file system,
3035 and send a "capture started successfully and capture file created"
3036 message to our parent so that they'll open the capture file and
3037 update its windows to indicate that we have a live capture in
3039 libpcap_dump_flush(global_ld.pdh, NULL);
3040 report_new_capture_file(capture_opts->save_file);
3043 /* initialize capture stop (and alike) conditions */
3044 init_capture_stop_conditions();
3045 /* create stop conditions */
3046 if (capture_opts->has_autostop_filesize)
3048 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3049 if (capture_opts->has_autostop_duration)
3050 cnd_autostop_duration =
3051 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3053 if (capture_opts->multi_files_on) {
3054 if (capture_opts->has_file_duration)
3056 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3058 if (capture_opts->has_autostop_files)
3059 cnd_autostop_files =
3060 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3063 /* init the time values */
3065 upd_time = GetTickCount();
3067 gettimeofday(&upd_time, NULL);
3070 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3072 /* WOW, everything is prepared! */
3073 /* please fasten your seat belts, we will enter now the actual capture loop */
3074 while (global_ld.go) {
3075 /* dispatch incoming packets */
3076 inpkts = capture_loop_dispatch(capture_opts, &global_ld, errmsg,
3077 sizeof(errmsg), &pcap_opts);
3080 /* Were we asked to print packet counts by the SIGINFO handler? */
3081 if (global_ld.report_packet_count) {
3082 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3083 plurality(global_ld.packet_count, "", "s"));
3084 global_ld.report_packet_count = FALSE;
3089 /* any news from our parent (signal pipe)? -> just stop the capture */
3090 if (!signal_pipe_check_running()) {
3091 global_ld.go = FALSE;
3096 global_ld.inpkts_to_sync_pipe += inpkts;
3098 /* check capture size condition */
3099 if (cnd_autostop_size != NULL &&
3100 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3101 /* Capture size limit reached, do we have another file? */
3102 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3103 cnd_autostop_size, cnd_file_duration))
3105 } /* cnd_autostop_size */
3106 if (capture_opts->output_to_pipe) {
3107 libpcap_dump_flush(global_ld.pdh, NULL);
3111 /* Only update once every 500ms so as not to overload slow displays.
3112 * This also prevents too much context-switching between the dumpcap
3113 * and wireshark processes.
3115 #define DUMPCAP_UPD_TIME 500
3118 cur_time = GetTickCount();
3119 if ( (cur_time - upd_time) > DUMPCAP_UPD_TIME) {
3121 gettimeofday(&cur_time, NULL);
3122 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3123 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3126 upd_time = cur_time;
3129 if (pcap_stats(pch, stats) >= 0) {
3130 *stats_known = TRUE;
3133 /* Let the parent process know. */
3134 if (global_ld.inpkts_to_sync_pipe) {
3136 libpcap_dump_flush(global_ld.pdh, NULL);
3138 /* Send our parent a message saying we've written out
3139 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3141 report_packet_count(global_ld.inpkts_to_sync_pipe);
3143 global_ld.inpkts_to_sync_pipe = 0;
3146 /* check capture duration condition */
3147 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3148 /* The maximum capture time has elapsed; stop the capture. */
3149 global_ld.go = FALSE;
3153 /* check capture file duration condition */
3154 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3155 /* duration limit reached, do we have another file? */
3156 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3157 cnd_autostop_size, cnd_file_duration))
3159 } /* cnd_file_duration */
3163 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3165 /* delete stop conditions */
3166 if (cnd_file_duration != NULL)
3167 cnd_delete(cnd_file_duration);
3168 if (cnd_autostop_files != NULL)
3169 cnd_delete(cnd_autostop_files);
3170 if (cnd_autostop_size != NULL)
3171 cnd_delete(cnd_autostop_size);
3172 if (cnd_autostop_duration != NULL)
3173 cnd_delete(cnd_autostop_duration);
3175 /* did we had a pcap (input) error? */
3176 for (i = 0; i < capture_opts->ifaces->len; i++) {
3177 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3178 if (pcap_opts.pcap_err) {
3179 /* On Linux, if an interface goes down while you're capturing on it,
3180 you'll get a "recvfrom: Network is down" or
3181 "The interface went down" error (ENETDOWN).
3182 (At least you will if strerror() doesn't show a local translation
3185 On FreeBSD and OS X, if a network adapter disappears while
3186 you're capturing on it, you'll get a "read: Device not configured"
3187 error (ENXIO). (See previous parenthetical note.)
3189 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3191 These should *not* be reported to the Wireshark developers. */
3194 cap_err_str = pcap_geterr(pcap_opts.pcap_h);
3195 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3196 strcmp(cap_err_str, "The interface went down") == 0 ||
3197 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3198 strcmp(cap_err_str, "read: I/O error") == 0 ||
3199 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3200 report_capture_error("The network adapter on which the capture was being done "
3201 "is no longer running; the capture has stopped.",
3204 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3206 report_capture_error(errmsg, please_report);
3209 } else if (pcap_opts.from_cap_pipe && pcap_opts.cap_pipe_err == PIPERR) {
3210 report_capture_error(errmsg, "");
3214 /* did we have an output error while capturing? */
3215 if (global_ld.err == 0) {
3218 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3219 global_ld.err, FALSE);
3220 report_capture_error(errmsg, please_report);
3224 if (capture_opts->saving_to_file) {
3225 /* close the output file */
3226 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3230 /* there might be packets not yet notified to the parent */
3231 /* (do this after closing the file, so all packets are already flushed) */
3232 if(global_ld.inpkts_to_sync_pipe) {
3234 report_packet_count(global_ld.inpkts_to_sync_pipe);
3235 global_ld.inpkts_to_sync_pipe = 0;
3238 /* If we've displayed a message about a write error, there's no point
3239 in displaying another message about an error on close. */
3240 if (!close_ok && write_ok) {
3241 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3243 report_capture_error(errmsg, "");
3247 * XXX We exhibit different behaviour between normal mode and sync mode
3248 * when the pipe is stdin and not already at EOF. If we're a child, the
3249 * parent's stdin isn't closed, so if the user starts another capture,
3250 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3251 * will say "Unrecognized libpcap format". On the other hand, in normal
3252 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3255 report_capture_count(); /* print final capture count only if (quiet && !capture_child) */
3257 /* get packet drop statistics from pcap */
3258 for (i = 0; i < capture_opts->ifaces->len; i++) {
3259 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3260 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3261 if (pcap_opts.pcap_h != NULL) {
3262 g_assert(!pcap_opts.from_cap_pipe);
3263 /* Get the capture statistics, so we know how many packets were dropped. */
3264 if (pcap_stats(pcap_opts.pcap_h, stats) >= 0) {
3265 *stats_known = TRUE;
3266 /* Let the parent process know. */
3267 report_packet_drops(stats->ps_recv, stats->ps_drop, interface_opts.name);
3269 g_snprintf(errmsg, sizeof(errmsg),
3270 "Can't get packet-drop statistics: %s",
3271 pcap_geterr(pcap_opts.pcap_h));
3272 report_capture_error(errmsg, please_report);
3277 /* close the input file (pcap or capture pipe) */
3278 capture_loop_close_input(&global_ld);
3280 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3282 /* ok, if the write and the close were successful. */
3283 return write_ok && close_ok;
3286 if (capture_opts->multi_files_on) {
3287 /* cleanup ringbuffer */
3288 ringbuf_error_cleanup();
3290 /* We can't use the save file, and we have no FILE * for the stream
3291 to close in order to close it, so close the FD directly. */
3292 if (global_ld.save_file_fd != -1) {
3293 ws_close(global_ld.save_file_fd);
3296 /* We couldn't even start the capture, so get rid of the capture
3298 if (capture_opts->save_file != NULL) {
3299 ws_unlink(capture_opts->save_file);
3300 g_free(capture_opts->save_file);
3303 capture_opts->save_file = NULL;
3305 report_cfilter_error(interface_opts.cfilter, errmsg);
3307 report_capture_error(errmsg, secondary_errmsg);
3309 /* close the input file (pcap or cap_pipe) */
3310 capture_loop_close_input(&global_ld);
3312 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3318 static void capture_loop_stop(void)
3320 #ifdef HAVE_PCAP_BREAKLOOP
3322 pcap_options pcap_opts;
3324 for (i = 0; i < global_ld.pcaps->len; i++) {
3325 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3326 if (pcap_opts.pcap_h != NULL)
3327 pcap_breakloop(pcap_opts.pcap_h);
3330 global_ld.go = FALSE;
3335 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3336 int err, gboolean is_close)
3341 g_snprintf(errmsg, errmsglen,
3342 "Not all the packets could be written to the file"
3343 " to which the capture was being saved\n"
3344 "(\"%s\") because there is no space left on the file system\n"
3345 "on which that file resides.",
3351 g_snprintf(errmsg, errmsglen,
3352 "Not all the packets could be written to the file"
3353 " to which the capture was being saved\n"
3354 "(\"%s\") because you are too close to, or over,"
3355 " your disk quota\n"
3356 "on the file system on which that file resides.",
3363 g_snprintf(errmsg, errmsglen,
3364 "The file to which the capture was being saved\n"
3365 "(\"%s\") could not be closed: %s.",
3366 fname, strerror(err));
3368 g_snprintf(errmsg, errmsglen,
3369 "An error occurred while writing to the file"
3370 " to which the capture was being saved\n"
3372 fname, strerror(err));
3379 /* one packet was captured, process it */
3381 capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
3384 loop_data *ld = (loop_data *) (void *) user;
3387 /* We may be called multiple times from pcap_dispatch(); if we've set
3388 the "stop capturing" flag, ignore this packet, as we're not
3389 supposed to be saving any more packets. */
3394 gboolean successful;
3396 /* We're supposed to write the packet to a file; do so.
3397 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3398 "ld->err" to the error. */
3399 if (global_capture_opts.use_pcapng) {
3400 successful = libpcap_write_enhanced_packet_block(ld->pdh, phdr, 0, pd, &ld->bytes_written, &err);
3402 successful = libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err);
3409 /* if the user told us to stop after x packets, do we already have enough? */
3410 if ((ld->packet_max > 0) && (ld->packet_count >= ld->packet_max)) {
3418 /* And now our feature presentation... [ fade to music ] */
3420 main(int argc, char *argv[])
3423 gboolean arg_error = FALSE;
3430 struct sigaction action, oldaction;
3433 gboolean start_capture = TRUE;
3434 gboolean stats_known;
3435 struct pcap_stat stats;
3436 GLogLevelFlags log_flags;
3437 gboolean list_interfaces = FALSE;
3438 gboolean list_link_layer_types = FALSE;
3439 #ifdef HAVE_BPF_IMAGE
3440 gboolean print_bpf_code = FALSE;
3442 gboolean machine_readable = FALSE;
3443 gboolean print_statistics = FALSE;
3444 int status, run_once_args = 0;
3447 #if defined(__APPLE__) && defined(__LP64__)
3448 struct utsname osinfo;
3452 /* Convert our arg list to UTF-8. */
3453 wc_argv = CommandLineToArgvW(GetCommandLineW(), &wc_argc);
3454 if (wc_argv && wc_argc == argc) {
3455 for (i = 0; i < argc; i++) {
3456 argv[i] = g_utf16_to_utf8(wc_argv[i], -1, NULL, NULL, NULL);
3458 } /* XXX else bail because something is horribly, horribly wrong? */
3463 * Initialize our DLL search path. MUST be called before LoadLibrary
3466 ws_init_dll_search_path();
3469 #ifdef HAVE_PCAP_REMOTE
3470 #define OPTSTRING_A "A:"
3471 #define OPTSTRING_r "r"
3472 #define OPTSTRING_u "u"
3474 #define OPTSTRING_A ""
3475 #define OPTSTRING_r ""
3476 #define OPTSTRING_u ""
3479 #ifdef HAVE_PCAP_SETSAMPLING
3480 #define OPTSTRING_m "m:"
3482 #define OPTSTRING_m ""
3485 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3486 #define OPTSTRING_B "B:"
3488 #define OPTSTRING_B ""
3489 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3491 #ifdef HAVE_PCAP_CREATE
3492 #define OPTSTRING_I "I"
3494 #define OPTSTRING_I ""
3497 #ifdef HAVE_BPF_IMAGE
3498 #define OPTSTRING_d "d"
3500 #define OPTSTRING_d ""
3503 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "L" OPTSTRING_m "Mnpq" OPTSTRING_r "Ss:" OPTSTRING_u "vw:y:Z:"
3505 #ifdef DEBUG_CHILD_DUMPCAP
3506 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3507 fprintf (stderr, "Unable to open debug log file !\n");
3512 #if defined(__APPLE__) && defined(__LP64__)
3514 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3515 * a bug workaround - timeouts less than 1 second don't work with libpcap
3516 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3517 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3518 * The problem is extremely unlikely to be reintroduced in a future
3521 if (uname(&osinfo) == 0) {
3523 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3524 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3525 * number of 10.0.0, not 10.1.0 - go figure).
3527 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3528 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3529 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3530 need_timeout_workaround = TRUE;
3535 * Determine if dumpcap is being requested to run in a special
3536 * capture_child mode by going thru the command line args to see if
3537 * a -Z is present. (-Z is a hidden option).
3539 * The primary result of running in capture_child mode is that
3540 * all messages sent out on stderr are in a special type/len/string
3541 * format to allow message processing by type. These messages include
3542 * error messages if dumpcap fails to start the operation it was
3543 * requested to do, as well as various "status" messages which are sent
3544 * when an actual capture is in progress, and a "success" message sent
3545 * if dumpcap was requested to perform an operation other than a
3548 * Capture_child mode would normally be requested by a parent process
3549 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3550 * to which dumpcap stderr has been redirected. It might also have
3551 * another pipe to obtain dumpcap stdout output; for operations other
3552 * than a capture, that information is formatted specially for easier
3553 * parsing by the parent process.
3555 * Capture_child mode needs to be determined immediately upon
3556 * startup so that any messages generated by dumpcap in this mode
3557 * (eg: during initialization) will be formatted properly.
3560 for (i=1; i<argc; i++) {
3561 if (strcmp("-Z", argv[i]) == 0) {
3562 capture_child = TRUE;
3563 machine_readable = TRUE; /* request machine-readable output */
3565 /* set output pipe to binary mode, to avoid ugly text conversions */
3566 _setmode(2, O_BINARY);
3571 /* The default_log_handler will use stdout, which makes trouble in */
3572 /* capture child mode, as it uses stdout for it's sync_pipe. */
3573 /* So: the filtering is done in the console_log_handler and not here.*/
3574 /* We set the log handlers right up front to make sure that any log */
3575 /* messages when running as child will be sent back to the parent */
3576 /* with the correct format. */
3580 G_LOG_LEVEL_CRITICAL|
3581 G_LOG_LEVEL_WARNING|
3582 G_LOG_LEVEL_MESSAGE|
3585 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3587 g_log_set_handler(NULL,
3589 console_log_handler, NULL /* user_data */);
3590 g_log_set_handler(LOG_DOMAIN_MAIN,
3592 console_log_handler, NULL /* user_data */);
3593 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3595 console_log_handler, NULL /* user_data */);
3596 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3598 console_log_handler, NULL /* user_data */);
3600 /* Initialize the thread system */
3601 if (!g_thread_supported())
3602 g_thread_init(NULL);
3604 /* Load wpcap if possible. Do this before collecting the run-time version information */
3607 /* ... and also load the packet.dll from wpcap */
3608 /* XXX - currently not required, may change later. */
3609 /*wpcap_packet_load();*/
3611 /* Start windows sockets */
3612 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3614 /* Set handler for Ctrl+C key */
3615 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3617 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3619 action.sa_handler = capture_cleanup_handler;
3621 * Arrange that system calls not get restarted, because when
3622 * our signal handler returns we don't want to restart
3623 * a call that was waiting for packets to arrive.
3625 action.sa_flags = 0;
3626 sigemptyset(&action.sa_mask);
3627 sigaction(SIGTERM, &action, NULL);
3628 sigaction(SIGINT, &action, NULL);
3629 sigaction(SIGPIPE, &action, NULL);
3630 sigaction(SIGHUP, NULL, &oldaction);
3631 if (oldaction.sa_handler == SIG_DFL)
3632 sigaction(SIGHUP, &action, NULL);
3635 /* Catch SIGINFO and, if we get it and we're capturing in
3636 quiet mode, report the number of packets we've captured. */
3637 action.sa_handler = report_counts_siginfo;
3638 action.sa_flags = SA_RESTART;
3639 sigemptyset(&action.sa_mask);
3640 sigaction(SIGINFO, &action, NULL);
3641 #endif /* SIGINFO */
3644 /* ----------------------------------------------------------------- */
3645 /* Privilege and capability handling */
3647 /* 1. Running not as root or suid root; no special capabilities. */
3650 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3653 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3655 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3656 /* capabilities; Drop all other capabilities; */
3657 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3658 /* else: after pcap_open_live() in capture_loop_open_input() */
3659 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3660 /* (Note: this means that the process, although logged in */
3661 /* as root, does not have various permissions such as the */
3662 /* ability to bypass file access permissions). */
3663 /* XXX: Should we just leave capabilities alone in this case */
3664 /* so that user gets expected effect that root can do */
3667 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3669 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3670 /* else: after pcap_open_live() in capture_loop_open_input() */
3671 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3672 /* pcap_open_live). */
3674 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3676 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3677 /* capabilities; Drop all other capabilities; */
3678 /* Drop suid privileges (euid=ruid); */
3679 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3680 /* else: after pcap_open_live() in capture_loop_open_input() */
3681 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3683 /* XXX: For some Linux versions/distros with capabilities */
3684 /* a 'normal' process with any capabilities cannot be */
3685 /* 'killed' (signaled) from another (same uid) non-privileged */
3687 /* For example: If (non-suid) Wireshark forks a */
3688 /* child suid dumpcap which acts as described here (case 5), */
3689 /* Wireshark will be unable to kill (signal) the child */
3690 /* dumpcap process until the capabilities have been dropped */
3691 /* (after pcap_open_live()). */
3692 /* This behaviour will apparently be changed in the kernel */
3693 /* to allow the kill (signal) in this case. */
3694 /* See the following for details: */
3695 /* http://www.mail-archive.com/ [wrapped] */
3696 /* linux-security-module@vger.kernel.org/msg02913.html */
3698 /* It is therefore conceivable that if dumpcap somehow hangs */
3699 /* in pcap_open_live or before that wireshark will not */
3700 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3701 /* In this case, exiting wireshark will kill the child */
3702 /* dumpcap process. */
3704 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3705 /* capabilities; Using libcap. Note: capset cmd (which see) */
3706 /* used to assign capabilities to file. */
3708 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3709 /* else: after pcap_open_live() in capture_loop_open_input() */
3710 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3712 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3713 /* longer required (similar to capture). */
3715 /* ----------------------------------------------------------------- */
3717 init_process_policies();
3720 /* If 'started with special privileges' (and using libcap) */
3721 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3722 /* Set euid/egid = ruid/rgid to remove suid privileges */
3723 relinquish_privs_except_capture();
3726 /* Set the initial values in the capture options. This might be overwritten
3727 by the command line parameters. */
3728 capture_opts_init(&global_capture_opts, NULL);
3730 /* Default to capturing the entire packet. */
3731 global_capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
3733 /* We always save to a file - if no file was specified, we save to a
3735 global_capture_opts.saving_to_file = TRUE;
3736 global_capture_opts.has_ring_num_files = TRUE;
3738 /* Now get our args */
3739 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3741 case 'h': /* Print help and exit */
3745 case 'v': /* Show version and exit */
3747 GString *comp_info_str;
3748 GString *runtime_info_str;
3749 /* Assemble the compile-time version information string */
3750 comp_info_str = g_string_new("Compiled ");
3751 get_compiled_version_info(comp_info_str, NULL, NULL);
3753 /* Assemble the run-time version information string */
3754 runtime_info_str = g_string_new("Running ");
3755 get_runtime_version_info(runtime_info_str, NULL);
3756 show_version(comp_info_str, runtime_info_str);
3757 g_string_free(comp_info_str, TRUE);
3758 g_string_free(runtime_info_str, TRUE);
3762 /*** capture option specific ***/
3763 case 'a': /* autostop criteria */
3764 case 'b': /* Ringbuffer option */
3765 case 'c': /* Capture x packets */
3766 case 'f': /* capture filter */
3767 case 'i': /* Use interface x */
3768 case 'n': /* Use pcapng format */
3769 case 'p': /* Don't capture in promiscuous mode */
3770 case 's': /* Set the snapshot (capture) length */
3771 case 'w': /* Write to capture file x */
3772 case 'g': /* enable group read accesson file(s) */
3773 case 'y': /* Set the pcap data link type */
3774 #ifdef HAVE_PCAP_REMOTE
3775 case 'u': /* Use UDP for data transfer */
3776 case 'r': /* Capture own RPCAP traffic too */
3777 case 'A': /* Authentication */
3779 #ifdef HAVE_PCAP_SETSAMPLING
3780 case 'm': /* Sampling */
3782 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3783 case 'B': /* Buffer size */
3784 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3785 #ifdef HAVE_PCAP_CREATE
3786 case 'I': /* Monitor mode */
3788 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
3793 /*** hidden option: Wireshark child mode (using binary output messages) ***/
3795 capture_child = TRUE;
3797 /* set output pipe to binary mode, to avoid ugly text conversions */
3798 _setmode(2, O_BINARY);
3800 * optarg = the control ID, aka the PPID, currently used for the
3803 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
3804 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
3805 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
3806 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
3808 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
3809 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3810 "Signal pipe: Unable to open %s. Dead parent?",
3818 case 'q': /* Quiet */
3822 /*** all non capture option specific ***/
3823 case 'D': /* Print a list of capture devices and exit */
3824 list_interfaces = TRUE;
3827 case 'L': /* Print list of link-layer types and exit */
3828 list_link_layer_types = TRUE;
3831 #ifdef HAVE_BPF_IMAGE
3832 case 'd': /* Print BPF code for capture filter and exit */
3833 print_bpf_code = TRUE;
3837 case 'S': /* Print interface statistics once a second */
3838 print_statistics = TRUE;
3841 case 'M': /* For -D, -L, and -S, print machine-readable output */
3842 machine_readable = TRUE;
3845 case '?': /* Bad flag - print usage message */
3846 cmdarg_err("Invalid Option: %s", argv[optind-1]);
3854 /* user specified file name as regular command-line argument */
3855 /* XXX - use it as the capture file name (or something else)? */
3862 * Extra command line arguments were specified; complain.
3863 * XXX - interpret as capture filter, as tcpdump and tshark do?
3865 cmdarg_err("Invalid argument: %s", argv[0]);
3874 if (run_once_args > 1) {
3875 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
3877 } else if (run_once_args == 1) {
3878 /* We're supposed to print some information, rather than
3879 to capture traffic; did they specify a ring buffer option? */
3880 if (global_capture_opts.multi_files_on) {
3881 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
3885 /* We're supposed to capture traffic; was the ring buffer option
3886 specified and, if so, does it make sense? */
3887 if (global_capture_opts.multi_files_on) {
3888 /* Ring buffer works only under certain conditions:
3889 a) ring buffer does not work with temporary files;
3890 b) it makes no sense to enable the ring buffer if the maximum
3891 file size is set to "infinite". */
3892 if (global_capture_opts.save_file == NULL) {
3893 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
3894 global_capture_opts.multi_files_on = FALSE;
3896 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
3897 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
3899 /* XXX - this must be redesigned as the conditions changed */
3900 global_capture_opts.multi_files_on = FALSE;
3907 * "-D" requires no interface to be selected; it's supposed to list
3910 if (list_interfaces) {
3911 /* Get the list of interfaces */
3916 if_list = capture_interface_list(&err, &err_str);
3917 if (if_list == NULL) {
3919 case CANT_GET_INTERFACE_LIST:
3920 cmdarg_err("%s", err_str);
3925 case NO_INTERFACES_FOUND:
3927 * If we're being run by another program, just give them
3928 * an empty list of interfaces, don't report this as
3929 * an error; that lets them decide whether to report
3930 * this as an error or not.
3932 if (!machine_readable) {
3933 cmdarg_err("There are no interfaces on which a capture can be done");
3940 if (machine_readable) /* tab-separated values to stdout */
3941 print_machine_readable_interfaces(if_list);
3943 capture_opts_print_interfaces(if_list);
3944 free_interface_list(if_list);
3949 * "-S" requires no interface to be selected; it gives statistics
3950 * for all interfaces.
3952 if (print_statistics) {
3953 status = print_statistics_loop(machine_readable);
3958 * "-L", "-d", and capturing act on a particular interface, so we have to
3959 * have an interface; if none was specified, pick a default.
3961 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
3962 /* cmdarg_err() already called .... */
3966 /* Let the user know what interfaces were chosen. */
3967 /* get_interface_descriptive_name() is not available! */
3968 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
3969 interface_options interface_opts;
3971 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
3972 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s", interface_opts.name);
3975 if (list_link_layer_types) {
3976 /* Get the list of link-layer types for the capture device. */
3977 if_capabilities_t *caps;
3981 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
3982 interface_options interface_opts;
3984 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
3985 caps = get_if_capabilities(interface_opts.name,
3986 interface_opts.monitor_mode, &err_str);
3988 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
3989 "Please check to make sure you have sufficient permissions, and that\n"
3990 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
3994 if (caps->data_link_types == NULL) {
3995 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
3998 if (machine_readable) /* tab-separated values to stdout */
3999 /* XXX: We need to change the format and adopt consumers */
4000 print_machine_readable_if_capabilities(caps);
4002 /* XXX: We might want to print also the interface name */
4003 capture_opts_print_if_capabilities(caps, interface_opts.name,
4004 interface_opts.monitor_mode);
4005 free_if_capabilities(caps);
4010 /* We're supposed to do a capture, or print the BPF code for a filter.
4011 Process the snapshot length, as that affects the generated BPF code. */
4012 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4014 #ifdef HAVE_BPF_IMAGE
4015 if (print_bpf_code) {
4016 show_filter_code(&global_capture_opts);
4021 /* We're supposed to do a capture. Process the ring buffer arguments. */
4022 capture_opts_trim_ring_num_files(&global_capture_opts);
4024 /* Now start the capture. */
4026 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4030 /* capture failed */
4033 return 0; /* never here, make compiler happy */
4038 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4039 const char *message, gpointer user_data _U_)
4046 /* ignore log message, if log_level isn't interesting */
4047 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4048 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4053 /* create a "timestamp" */
4055 today = localtime(&curr);
4057 switch(log_level & G_LOG_LEVEL_MASK) {
4058 case G_LOG_LEVEL_ERROR:
4061 case G_LOG_LEVEL_CRITICAL:
4064 case G_LOG_LEVEL_WARNING:
4067 case G_LOG_LEVEL_MESSAGE:
4070 case G_LOG_LEVEL_INFO:
4073 case G_LOG_LEVEL_DEBUG:
4077 fprintf(stderr, "unknown log_level %u\n", log_level);
4079 g_assert_not_reached();
4082 /* Generate the output message */
4083 if(log_level & G_LOG_LEVEL_MESSAGE) {
4084 /* normal user messages without additional infos */
4085 msg = g_strdup_printf("%s\n", message);
4087 /* info/debug messages with additional infos */
4088 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4089 today->tm_hour, today->tm_min, today->tm_sec,
4090 log_domain != NULL ? log_domain : "",
4094 /* DEBUG & INFO msgs (if we're debugging today) */
4095 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4096 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4097 #ifdef DEBUG_DUMPCAP
4098 fprintf(stderr, "%s", msg);
4101 #ifdef DEBUG_CHILD_DUMPCAP
4102 fprintf(debug_log, "%s", msg);
4110 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4111 /* to parent especially formatted if dumpcap running as child. */
4112 if (capture_child) {
4113 sync_pipe_errmsg_to_parent(2, msg, "");
4115 fprintf(stderr, "%s", msg);
4122 /****************************************************************************************************************/
4123 /* indication report routines */
4127 report_packet_count(int packet_count)
4129 char tmp[SP_DECISIZE+1+1];
4130 static int count = 0;
4133 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4134 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4135 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4137 count += packet_count;
4138 fprintf(stderr, "\rPackets: %u ", count);
4139 /* stderr could be line buffered */
4145 report_new_capture_file(const char *filename)
4148 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4149 pipe_write_block(2, SP_FILE, filename);
4153 * Prevent a SIGINFO handler from writing to the standard error
4154 * while we're doing so; instead, have it just set a flag telling
4155 * us to print that information when we're done.
4158 #endif /* SIGINFO */
4159 fprintf(stderr, "File: %s\n", filename);
4160 /* stderr could be line buffered */
4165 * Allow SIGINFO handlers to write.
4170 * If a SIGINFO handler asked us to write out capture counts, do so.
4173 report_counts_for_siginfo();
4174 #endif /* SIGINFO */
4179 report_cfilter_error(const char *cfilter, const char *errmsg)
4181 if (capture_child) {
4182 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4183 pipe_write_block(2, SP_BAD_FILTER, errmsg);
4186 "Invalid capture filter: \"%s\"!\n"
4188 "That string isn't a valid capture filter (%s).\n"
4189 "See the User's Guide for a description of the capture filter syntax.\n",
4195 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4198 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4199 "Primary Error: %s", error_msg);
4200 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4201 "Secondary Error: %s", secondary_error_msg);
4202 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4204 fprintf(stderr, "%s\n", error_msg);
4205 if (secondary_error_msg[0] != '\0')
4206 fprintf(stderr, "%s\n", secondary_error_msg);
4211 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4213 char tmp1[SP_DECISIZE+1+1];
4214 char tmp2[SP_DECISIZE+1+1];
4216 g_snprintf(tmp1, sizeof(tmp1), "%u", received);
4217 g_snprintf(tmp2, sizeof(tmp2), "%u", drops);
4220 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets captured/dropped on interface %s: %s/%s", name, tmp1, tmp2);
4221 /* XXX: Need to provide interface id, changes to consumers required. */
4222 pipe_write_block(2, SP_DROPS, tmp2);
4224 fprintf(stderr, "Packets captured/dropped on interface %s: %s/%s\n", name, tmp1, tmp2);
4225 /* stderr could be line buffered */
4231 /****************************************************************************************************************/
4232 /* signal_pipe handling */
4237 signal_pipe_check_running(void)
4239 /* any news from our parent? -> just stop the capture */
4243 /* if we are running standalone, no check required */
4244 if(!capture_child) {
4248 if(!sig_pipe_name || !sig_pipe_handle) {
4249 /* This shouldn't happen */
4250 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4251 "Signal pipe: No name or handle");
4256 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4257 * at this point. Should we check to see if the parent is still alive,
4258 * e.g. by using OpenProcess?
4261 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4263 if(!result || avail > 0) {
4264 /* peek failed or some bytes really available */
4265 /* (if not piping from stdin this would fail) */
4266 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4267 "Signal pipe: Stop capture: %s", sig_pipe_name);
4268 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4269 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4270 sig_pipe_handle, result, avail);
4273 /* pipe ok and no bytes available */
4280 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4285 * indent-tabs-mode: nil
4288 * vi: set shiftwidth=4 tabstop=8 expandtab
4289 * :indentSize=4:tabSize=8:noTabs=true: