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**/
126 #ifdef DEBUG_CHILD_DUMPCAP
127 FILE *debug_log; /* for logging debug messages to */
128 /* a file if DEBUG_CHILD_DUMPCAP */
136 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
138 static gchar *sig_pipe_name = NULL;
139 static HANDLE sig_pipe_handle = NULL;
140 static gboolean signal_pipe_check_running(void);
144 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
145 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
148 /** Stop a low-level capture (stops the capture child). */
149 static void capture_loop_stop(void);
151 #if !defined (__linux__)
152 #ifndef HAVE_PCAP_BREAKLOOP
154 * We don't have pcap_breakloop(), which is the only way to ensure that
155 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
156 * won't, if the call to read the next packet or batch of packets is
157 * is interrupted by a signal on UN*X, just go back and try again to
160 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
161 * the signal handler, set a flag to stop capturing; however, without
162 * a guarantee of that sort, we can't guarantee that we'll stop capturing
163 * if the read will be retried and won't time out if no packets arrive.
165 * Therefore, on at least some platforms, we work around the lack of
166 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
167 * to wait for packets to arrive, so that we're probably going to be
168 * blocked in the select() when the signal arrives, and can just bail
169 * out of the loop at that point.
171 * However, we don't want to do that on BSD (because "select()" doesn't work
172 * correctly on BPF devices on at least some releases of some flavors of
173 * BSD), and we don't want to do it on Windows (because "select()" is
174 * something for sockets, not for arbitrary handles). (Note that "Windows"
175 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
176 * using WinPcap, not a UNIX libpcap.)
178 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
179 * on BSD times out even if no packets have arrived, so we'll eventually
180 * exit pcap_dispatch() with an indication that no packets have arrived,
181 * and will break out of the capture loop at that point.
183 * On Windows, we can't send a SIGINT to stop capturing, so none of this
184 * applies in any case.
186 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
187 * want to include it if it's not present on this platform, however.
189 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
190 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
192 # define MUST_DO_SELECT
193 # endif /* avoid select */
194 #endif /* HAVE_PCAP_BREAKLOOP */
196 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
197 * in pcap_dispatch(); on the other hand, select() works just fine there.
198 * Hence we use a select for that come what may.
200 #define MUST_DO_SELECT
203 /** init the capture filter */
206 INITFILTER_BAD_FILTER,
207 INITFILTER_OTHER_ERROR
208 } initfilter_status_t;
210 typedef struct _pcap_options {
212 #ifdef MUST_DO_SELECT
213 int pcap_fd; /* pcap file descriptor */
220 /* capture pipe (unix only "input file") */
221 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
222 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
223 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
225 HANDLE cap_pipe_h; /* The handle of the capture pipe */
227 int cap_pipe_fd; /* the file descriptor of the capture pipe */
229 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
230 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
232 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
233 #endif /* USE_THREADS */
234 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
235 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
237 STATE_EXPECT_REC_HDR,
242 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
244 GMutex *cap_pipe_read_mtx;
245 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
249 typedef struct _loop_data {
251 gboolean go; /* TRUE as long as we're supposed to keep capturing */
252 int err; /* if non-zero, error seen while capturing */
253 gint packet_count; /* Number of packets we have already captured */
254 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
255 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
257 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
264 guint32 autostop_files;
268 * Standard secondary message for unexpected errors.
270 static const char please_report[] =
271 "Please report this to the Wireshark developers.\n"
272 "(This is not a crash; please do not report it as such.)";
275 * This needs to be static, so that the SIGINT handler can clear the "go"
278 static loop_data global_ld;
282 * Timeout, in milliseconds, for reads from the stream of captured packets
283 * from a capture device.
285 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
286 * 64-bit applications, with sub-second timeouts not to work. The bug is
287 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
289 #if defined(__APPLE__) && defined(__LP64__)
290 static gboolean need_timeout_workaround;
292 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
294 #define CAP_READ_TIMEOUT 250
298 * Timeout, in microseconds, for reads from the stream of captured packets
299 * from a pipe. Pipes don't have the same problem that BPF devices do
300 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
301 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
302 * of the offending versions of Snow Leopard.
304 * On Windows this value is converted to milliseconds and passed to
305 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
306 * will return immediately.
309 #define PIPE_READ_TIMEOUT 250000
311 #define PIPE_READ_TIMEOUT 100000
313 static const char *cap_pipe_err_str;
316 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
317 const char *message, gpointer user_data _U_);
319 /* capture related options */
320 static capture_options global_capture_opts;
321 static gboolean quiet = FALSE;
323 static void capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
325 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
326 int err, gboolean is_close);
328 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
330 static void report_new_capture_file(const char *filename);
331 static void report_packet_count(int packet_count);
332 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
333 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
334 static void report_cfilter_error(const char *cfilter, const char *errmsg);
336 #define MSG_MAX_LENGTH 4096
339 print_usage(gboolean print_ver)
346 "Dumpcap " VERSION "%s\n"
347 "Capture network packets and dump them into a libpcap file.\n"
348 "See http://www.wireshark.org for more information.\n",
349 wireshark_svnversion);
353 fprintf(output, "\nUsage: dumpcap [options] ...\n");
354 fprintf(output, "\n");
355 fprintf(output, "Capture interface:\n");
356 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
357 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
358 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
359 fprintf(output, " -p don't capture in promiscuous mode\n");
360 #ifdef HAVE_PCAP_CREATE
361 fprintf(output, " -I capture in monitor mode, if available\n");
363 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
364 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
366 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
367 fprintf(output, " -D print list of interfaces and exit\n");
368 fprintf(output, " -L print list of link-layer types of iface and exit\n");
369 #ifdef HAVE_BPF_IMAGE
370 fprintf(output, " -d print generated BPF code for capture filter\n");
372 fprintf(output, " -S print statistics for each interface once every second\n");
373 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
374 fprintf(output, "\n");
375 #ifdef HAVE_PCAP_REMOTE
376 fprintf(output, "\nRPCAP options:\n");
377 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
378 fprintf(output, " -u use UDP for RPCAP data transfer\n");
379 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
380 #ifdef HAVE_PCAP_SETSAMPLING
381 fprintf(output, " -m <sampling type> use packet sampling\n");
382 fprintf(output, " count:NUM - capture one packet of every NUM\n");
383 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
386 fprintf(output, "Stop conditions:\n");
387 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
388 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
389 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
390 fprintf(output, " files:NUM - stop after NUM files\n");
391 /*fprintf(output, "\n");*/
392 fprintf(output, "Output (files):\n");
393 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
394 fprintf(output, " -g enable group read access on the output file(s)\n");
395 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
396 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
397 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
398 fprintf(output, " -n use pcapng format instead of pcap\n");
399 /*fprintf(output, "\n");*/
400 fprintf(output, "Miscellaneous:\n");
401 fprintf(output, " -q don't report packet capture counts\n");
402 fprintf(output, " -v print version information and exit\n");
403 fprintf(output, " -h display this help and exit\n");
404 fprintf(output, "\n");
405 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
406 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
407 fprintf(output, "\n");
408 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
412 show_version(GString *comp_info_str, GString *runtime_info_str)
415 "Dumpcap " VERSION "%s\n"
420 "See http://www.wireshark.org for more information.\n",
421 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
425 * Print to the standard error. This is a command-line tool, so there's
426 * no need to pop up a console.
429 vfprintf_stderr(const char *fmt, va_list ap)
431 vfprintf(stderr, fmt, ap);
435 fprintf_stderr(const char *fmt, ...)
440 vfprintf_stderr(fmt, ap);
445 * Report an error in command-line arguments.
448 cmdarg_err(const char *fmt, ...)
454 /* Generate a 'special format' message back to parent */
456 msg = g_strdup_vprintf(fmt, ap);
457 sync_pipe_errmsg_to_parent(2, msg, "");
462 fprintf(stderr, "dumpcap: ");
463 vfprintf(stderr, fmt, ap);
464 fprintf(stderr, "\n");
470 * Report additional information for an error in command-line arguments.
473 cmdarg_err_cont(const char *fmt, ...)
480 msg = g_strdup_vprintf(fmt, ap);
481 sync_pipe_errmsg_to_parent(2, msg, "");
486 vfprintf(stderr, fmt, ap);
487 fprintf(stderr, "\n");
494 #if 0 /* Set to enable capability debugging */
495 /* see 'man cap_to_text()' for explanation of output */
496 /* '=' means 'all= ' ie: no capabilities */
497 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
499 print_caps(const char *pfx) {
500 cap_t caps = cap_get_proc();
501 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
502 "%s: EUID: %d Capabilities: %s", pfx,
503 geteuid(), cap_to_text(caps, NULL));
506 print_caps(const char *pfx _U_) {
511 relinquish_all_capabilities(void)
513 /* Drop any and all capabilities this process may have. */
514 /* Allowed whether or not process has any privileges. */
515 cap_t caps = cap_init(); /* all capabilities initialized to off */
516 print_caps("Pre-clear");
517 if (cap_set_proc(caps)) {
518 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
520 print_caps("Post-clear");
526 open_capture_device(interface_options *interface_opts,
527 #ifdef HAVE_PCAP_OPEN
528 capture_options *capture_opts,
530 capture_options *capture_opts _U_,
532 char (*open_err_str)[PCAP_ERRBUF_SIZE])
535 #ifdef HAVE_PCAP_CREATE
538 #ifdef HAVE_PCAP_REMOTE
539 struct pcap_rmtauth auth;
542 /* Open the network interface to capture from it.
543 Some versions of libpcap may put warnings into the error buffer
544 if they succeed; to tell if that's happened, we have to clear
545 the error buffer, and check if it's still a null string. */
546 (*open_err_str)[0] = '\0';
547 #ifdef HAVE_PCAP_OPEN
549 * If we're opening a remote device, use pcap_open(); that's currently
550 * the only open routine that supports remote devices.
552 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
553 auth.type = capture_opts->auth_type == CAPTURE_AUTH_PWD ?
554 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
555 auth.username = capture_opts->auth_username;
556 auth.password = capture_opts->auth_password;
558 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
560 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
561 (capture_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
562 (capture_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
563 CAP_READ_TIMEOUT, &auth, *open_err_str);
565 #endif /* HAVE_PCAP_OPEN */
568 * If we're not opening a remote device, use pcap_create() and
569 * pcap_activate() if we have them, so that we can set the buffer
570 * size, otherwise use pcap_open_live().
572 #ifdef HAVE_PCAP_CREATE
573 pcap_h = pcap_create(interface_opts->name, *open_err_str);
574 if (pcap_h != NULL) {
575 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
576 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
577 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
579 if (interface_opts->buffer_size > 1) {
580 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
582 if (interface_opts->monitor_mode)
583 pcap_set_rfmon(pcap_h, 1);
584 err = pcap_activate(pcap_h);
586 /* Failed to activate, set to NULL */
587 if (err == PCAP_ERROR)
588 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
590 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
596 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
597 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
602 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
603 /* to remove any suid privileges. */
604 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
605 /* (euid/egid have already previously been set to ruid/rgid. */
606 /* (See comment in main() for details) */
608 relinquish_special_privs_perm();
610 relinquish_all_capabilities();
617 get_capture_device_open_failure_messages(const char *open_err_str,
623 char *errmsg, size_t errmsg_len,
624 char *secondary_errmsg,
625 size_t secondary_errmsg_len)
627 const char *libpcap_warn;
628 static const char ppamsg[] = "can't find PPA for ";
630 /* If we got a "can't find PPA for X" message, warn the user (who
631 is running dumcap on HP-UX) that they don't have a version of
632 libpcap that properly handles HP-UX (libpcap 0.6.x and later
633 versions, which properly handle HP-UX, say "can't find /dev/dlpi
634 PPA for X" rather than "can't find PPA for X"). */
635 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
638 "You are running (T)Wireshark with a version of the libpcap library\n"
639 "that doesn't handle HP-UX network devices well; this means that\n"
640 "(T)Wireshark may not be able to capture packets.\n"
642 "To fix this, you should install libpcap 0.6.2, or a later version\n"
643 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
644 "packaged binary form from the Software Porting And Archive Centre\n"
645 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
646 "at the URL lists a number of mirror sites.";
649 g_snprintf(errmsg, (gulong) errmsg_len,
650 "The capture session could not be initiated (%s).", open_err_str);
652 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
653 "Please check to make sure you have sufficient permissions, and that you have "
654 "the proper interface or pipe specified.%s", libpcap_warn);
656 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
658 "Please check that \"%s\" is the proper interface.\n"
661 "Help can be found at:\n"
663 " http://wiki.wireshark.org/WinPcap\n"
664 " http://wiki.wireshark.org/CaptureSetup\n",
669 /* Set the data link type on a pcap. */
671 set_pcap_linktype(pcap_t *pcap_h, int linktype,
672 #ifdef HAVE_PCAP_SET_DATALINK
677 char *errmsg, size_t errmsg_len,
678 char *secondary_errmsg, size_t secondary_errmsg_len)
680 char *set_linktype_err_str;
683 return TRUE; /* just use the default */
684 #ifdef HAVE_PCAP_SET_DATALINK
685 if (pcap_set_datalink(pcap_h, linktype) == 0)
686 return TRUE; /* no error */
687 set_linktype_err_str = pcap_geterr(pcap_h);
689 /* Let them set it to the type it is; reject any other request. */
690 if (get_pcap_linktype(pcap_h, name) == linktype)
691 return TRUE; /* no error */
692 set_linktype_err_str =
693 "That DLT isn't one of the DLTs supported by this device";
695 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
696 set_linktype_err_str);
698 * If the error isn't "XXX is not one of the DLTs supported by this device",
699 * tell the user to tell the Wireshark developers about it.
701 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
702 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
704 secondary_errmsg[0] = '\0';
709 compile_capture_filter(const char *iface, pcap_t *pcap_h,
710 struct bpf_program *fcode, char *cfilter)
712 bpf_u_int32 netnum, netmask;
713 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
715 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
717 * Well, we can't get the netmask for this interface; it's used
718 * only for filters that check for broadcast IP addresses, so
719 * we just punt and use 0. It might be nice to warn the user,
720 * but that's a pain in a GUI application, as it'd involve popping
721 * up a message box, and it's not clear how often this would make
722 * a difference (only filters that check for IP broadcast addresses
726 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
729 if (pcap_compile(pcap_h, fcode, cfilter, 1, netmask) < 0)
734 #ifdef HAVE_BPF_IMAGE
736 show_filter_code(capture_options *capture_opts)
738 interface_options interface_opts;
740 gchar open_err_str[PCAP_ERRBUF_SIZE];
741 char errmsg[MSG_MAX_LENGTH+1];
742 char secondary_errmsg[MSG_MAX_LENGTH+1];
743 struct bpf_program fcode;
744 struct bpf_insn *insn;
748 for (j = 0; j < capture_opts->ifaces->len; j++) {
749 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
750 pcap_h = open_capture_device(&interface_opts, capture_opts, &open_err_str);
751 if (pcap_h == NULL) {
752 /* Open failed; get messages */
753 get_capture_device_open_failure_messages(open_err_str,
755 errmsg, sizeof errmsg,
757 sizeof secondary_errmsg);
758 /* And report them */
759 report_capture_error(errmsg, secondary_errmsg);
763 /* Set the link-layer type. */
764 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
765 errmsg, sizeof errmsg,
766 secondary_errmsg, sizeof secondary_errmsg)) {
768 report_capture_error(errmsg, secondary_errmsg);
772 /* OK, try to compile the capture filter. */
773 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
774 interface_opts.cfilter)) {
776 report_cfilter_error(interface_opts.cfilter, errmsg);
781 /* Now print the filter code. */
782 insn = fcode.bf_insns;
784 for (i = 0; i < fcode.bf_len; insn++, i++)
785 printf("%s\n", bpf_image(insn, i));
788 /* Let our parent know we succeeded. */
789 pipe_write_block(2, SP_SUCCESS, NULL);
796 * capture_interface_list() is expected to do the right thing to get
797 * a list of interfaces.
799 * In most of the programs in the Wireshark suite, "the right thing"
800 * is to run dumpcap and ask it for the list, because dumpcap may
801 * be the only program in the suite with enough privileges to get
804 * In dumpcap itself, however, we obviously can't run dumpcap to
805 * ask for the list. Therefore, our capture_interface_list() should
806 * just call get_interface_list().
809 capture_interface_list(int *err, char **err_str)
811 return get_interface_list(err, err_str);
815 * Get the data-link type for a libpcap device.
816 * This works around AIX 5.x's non-standard and incompatible-with-the-
817 * rest-of-the-universe libpcap.
820 get_pcap_linktype(pcap_t *pch, const char *devname
828 const char *ifacename;
831 linktype = pcap_datalink(pch);
835 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
836 * rather than DLT_ values for link-layer types; the ifType values
837 * for LAN devices are:
844 * and the ifType value for a loopback device is 24.
846 * The AIX names for LAN devices begin with:
853 * and the AIX names for loopback devices begin with "lo".
855 * (The difference between "Ethernet" and "802.3" is presumably
856 * whether packets have an Ethernet header, with a packet type,
857 * or an 802.3 header, with a packet length, followed by an 802.2
858 * header and possibly a SNAP header.)
860 * If the device name matches "linktype" interpreted as an ifType
861 * value, rather than as a DLT_ value, we will assume this is AIX's
862 * non-standard, incompatible libpcap, rather than a standard libpcap,
863 * and will map the link-layer type to the standard DLT_ value for
864 * that link-layer type, as that's what the rest of Wireshark expects.
866 * (This means the capture files won't be readable by a tcpdump
867 * linked with AIX's non-standard libpcap, but so it goes. They
868 * *will* be readable by standard versions of tcpdump, Wireshark,
871 * XXX - if we conclude we're using AIX libpcap, should we also
872 * set a flag to cause us to assume the time stamps are in
873 * seconds-and-nanoseconds form, and to convert them to
874 * seconds-and-microseconds form before processing them and
879 * Find the last component of the device name, which is the
882 ifacename = strchr(devname, '/');
883 if (ifacename == NULL)
886 /* See if it matches any of the LAN device names. */
887 if (strncmp(ifacename, "en", 2) == 0) {
890 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
894 } else if (strncmp(ifacename, "et", 2) == 0) {
897 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
898 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
903 } else if (strncmp(ifacename, "tr", 2) == 0) {
906 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
907 * DLT_IEEE802, which is what's used for Token Ring.
911 } else if (strncmp(ifacename, "fi", 2) == 0) {
912 if (linktype == 15) {
914 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
918 } else if (strncmp(ifacename, "lo", 2) == 0) {
919 if (linktype == 24) {
921 * That's the RFC 1573 value for "software loopback" devices; map it
922 * to DLT_NULL, which is what's used for loopback devices on BSD.
932 static data_link_info_t *
933 create_data_link_info(int dlt)
935 data_link_info_t *data_link_info;
938 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
939 data_link_info->dlt = dlt;
940 text = pcap_datalink_val_to_name(dlt);
942 data_link_info->name = g_strdup(text);
944 data_link_info->name = g_strdup_printf("DLT %d", dlt);
945 text = pcap_datalink_val_to_description(dlt);
947 data_link_info->description = g_strdup(text);
949 data_link_info->description = NULL;
950 return data_link_info;
954 * Get the capabilities of a network device.
956 static if_capabilities_t *
957 get_if_capabilities(const char *devname, gboolean monitor_mode
958 #ifndef HAVE_PCAP_CREATE
963 if_capabilities_t *caps;
964 char errbuf[PCAP_ERRBUF_SIZE];
966 #ifdef HAVE_PCAP_CREATE
970 #ifdef HAVE_PCAP_LIST_DATALINKS
974 data_link_info_t *data_link_info;
977 * Allocate the interface capabilities structure.
979 caps = g_malloc(sizeof *caps);
981 #ifdef HAVE_PCAP_OPEN
982 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
983 caps->can_set_rfmon = FALSE;
986 *err_str = g_strdup(errbuf);
990 #elif defined(HAVE_PCAP_CREATE)
991 pch = pcap_create(devname, errbuf);
994 *err_str = g_strdup(errbuf);
998 status = pcap_can_set_rfmon(pch);
1001 if (status == PCAP_ERROR)
1002 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1005 *err_str = g_strdup(pcap_statustostr(status));
1011 caps->can_set_rfmon = FALSE;
1012 else if (status == 1) {
1013 caps->can_set_rfmon = TRUE;
1015 pcap_set_rfmon(pch, 1);
1017 if (err_str != NULL) {
1018 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1026 status = pcap_activate(pch);
1028 /* Error. We ignore warnings (status > 0). */
1029 if (err_str != NULL) {
1030 if (status == PCAP_ERROR)
1031 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1034 *err_str = g_strdup(pcap_statustostr(status));
1041 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1042 caps->can_set_rfmon = FALSE;
1044 if (err_str != NULL)
1045 *err_str = g_strdup(errbuf);
1050 deflt = get_pcap_linktype(pch, devname);
1051 #ifdef HAVE_PCAP_LIST_DATALINKS
1052 nlt = pcap_list_datalinks(pch, &linktypes);
1053 if (nlt == 0 || linktypes == NULL) {
1055 if (err_str != NULL)
1056 *err_str = NULL; /* an empty list doesn't mean an error */
1059 caps->data_link_types = NULL;
1060 for (i = 0; i < nlt; i++) {
1061 data_link_info = create_data_link_info(linktypes[i]);
1064 * XXX - for 802.11, make the most detailed 802.11
1065 * version the default, rather than the one the
1066 * device has as the default?
1068 if (linktypes[i] == deflt)
1069 caps->data_link_types = g_list_prepend(caps->data_link_types,
1072 caps->data_link_types = g_list_append(caps->data_link_types,
1075 #ifdef HAVE_PCAP_FREE_DATALINKS
1076 pcap_free_datalinks(linktypes);
1079 * In Windows, there's no guarantee that if you have a library
1080 * built with one version of the MSVC++ run-time library, and
1081 * it returns a pointer to allocated data, you can free that
1082 * data from a program linked with another version of the
1083 * MSVC++ run-time library.
1085 * This is not an issue on UN*X.
1087 * See the mail threads starting at
1089 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1093 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1096 #define xx_free free /* hack so checkAPIs doesn't complain */
1099 #endif /* HAVE_PCAP_FREE_DATALINKS */
1100 #else /* HAVE_PCAP_LIST_DATALINKS */
1102 data_link_info = create_data_link_info(deflt);
1103 caps->data_link_types = g_list_append(caps->data_link_types,
1105 #endif /* HAVE_PCAP_LIST_DATALINKS */
1109 if (err_str != NULL)
1114 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1116 print_machine_readable_interfaces(GList *if_list)
1123 char addr_str[ADDRSTRLEN];
1125 if (capture_child) {
1126 /* Let our parent know we succeeded. */
1127 pipe_write_block(2, SP_SUCCESS, NULL);
1130 i = 1; /* Interface id number */
1131 for (if_entry = g_list_first(if_list); if_entry != NULL;
1132 if_entry = g_list_next(if_entry)) {
1133 if_info = (if_info_t *)if_entry->data;
1134 printf("%d. %s", i++, if_info->name);
1137 * Print the contents of the if_entry struct in a parseable format.
1138 * Each if_entry element is tab-separated. Addresses are comma-
1141 /* XXX - Make sure our description doesn't contain a tab */
1142 if (if_info->description != NULL)
1143 printf("\t%s\t", if_info->description);
1147 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1148 addr = g_slist_next(addr)) {
1149 if (addr != g_slist_nth(if_info->addrs, 0))
1152 if_addr = (if_addr_t *)addr->data;
1153 switch(if_addr->ifat_type) {
1155 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1157 printf("%s", addr_str);
1159 printf("<unknown IPv4>");
1163 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1164 addr_str, ADDRSTRLEN)) {
1165 printf("%s", addr_str);
1167 printf("<unknown IPv6>");
1171 printf("<type unknown %u>", if_addr->ifat_type);
1175 if (if_info->loopback)
1176 printf("\tloopback");
1178 printf("\tnetwork");
1185 * If you change the machine-readable output format of this function,
1186 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1189 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1192 data_link_info_t *data_link_info;
1193 const gchar *desc_str;
1195 if (capture_child) {
1196 /* Let our parent know we succeeded. */
1197 pipe_write_block(2, SP_SUCCESS, NULL);
1200 if (caps->can_set_rfmon)
1204 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1205 lt_entry = g_list_next(lt_entry)) {
1206 data_link_info = (data_link_info_t *)lt_entry->data;
1207 if (data_link_info->description != NULL)
1208 desc_str = data_link_info->description;
1210 desc_str = "(not supported)";
1211 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1221 /* Print the number of packets captured for each interface until we're killed. */
1223 print_statistics_loop(gboolean machine_readable)
1225 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1231 char errbuf[PCAP_ERRBUF_SIZE];
1232 struct pcap_stat ps;
1234 if_list = get_interface_list(&err, &err_str);
1235 if (if_list == NULL) {
1237 case CANT_GET_INTERFACE_LIST:
1238 cmdarg_err("%s", err_str);
1242 case NO_INTERFACES_FOUND:
1243 cmdarg_err("There are no interfaces on which a capture can be done");
1249 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1250 if_info = (if_info_t *)if_entry->data;
1251 #ifdef HAVE_PCAP_OPEN
1252 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1254 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1258 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1259 if_stat->name = g_strdup(if_info->name);
1261 stat_list = g_list_append(stat_list, if_stat);
1266 cmdarg_err("There are no interfaces on which a capture can be done");
1270 if (capture_child) {
1271 /* Let our parent know we succeeded. */
1272 pipe_write_block(2, SP_SUCCESS, NULL);
1275 if (!machine_readable) {
1276 printf("%-15s %10s %10s\n", "Interface", "Received",
1280 global_ld.go = TRUE;
1281 while (global_ld.go) {
1282 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1283 if_stat = (if_stat_t *)stat_entry->data;
1284 pcap_stats(if_stat->pch, &ps);
1286 if (!machine_readable) {
1287 printf("%-15s %10u %10u\n", if_stat->name,
1288 ps.ps_recv, ps.ps_drop);
1290 printf("%s\t%u\t%u\n", if_stat->name,
1291 ps.ps_recv, ps.ps_drop);
1302 /* XXX - Not reached. Should we look for 'q' in stdin? */
1303 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1304 if_stat = (if_stat_t *)stat_entry->data;
1305 pcap_close(if_stat->pch);
1306 g_free(if_stat->name);
1309 g_list_free(stat_list);
1310 free_interface_list(if_list);
1318 capture_cleanup_handler(DWORD dwCtrlType)
1320 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1321 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1322 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1323 like SIGTERM at least when the machine's shutting down.
1325 For now, if we're running as a command rather than a capture child,
1326 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1327 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1328 in that way on UN*X.
1330 If we're not running as a capture child, we might be running as
1331 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1332 user logs out. (XXX - can we explicitly check whether we're
1333 running as a service?) */
1335 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1336 "Console: Control signal");
1337 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1338 "Console: Control signal, CtrlType: %u", dwCtrlType);
1340 /* Keep capture running if we're a service and a user logs off */
1341 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1342 capture_loop_stop();
1350 capture_cleanup_handler(int signum _U_)
1352 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1353 SIGTERM. We assume that if the user wanted it to keep running
1354 after they logged out, they'd have nohupped it. */
1356 /* Note: don't call g_log() in the signal handler: if we happened to be in
1357 * g_log() in process context when the signal came in, g_log will detect
1358 * the "recursion" and abort.
1361 capture_loop_stop();
1367 report_capture_count(void)
1369 /* Don't print this if we're a capture child. */
1370 if (!capture_child) {
1372 /* Report the count only if we aren't printing a packet count
1373 as packets arrive. */
1374 fprintf(stderr, "Packets captured: %u\n", global_ld.packet_count);
1375 /* stderr could be line buffered */
1384 report_counts_for_siginfo(void)
1386 report_capture_count();
1387 infoprint = FALSE; /* we just reported it */
1391 report_counts_siginfo(int signum _U_)
1393 int sav_errno = errno;
1395 /* If we've been told to delay printing, just set a flag asking
1396 that we print counts (if we're supposed to), otherwise print
1397 the count of packets captured (if we're supposed to). */
1401 report_counts_for_siginfo();
1404 #endif /* SIGINFO */
1407 exit_main(int status)
1410 /* Shutdown windows sockets */
1413 /* can be helpful for debugging */
1414 #ifdef DEBUG_DUMPCAP
1415 printf("Press any key\n");
1426 * If we were linked with libcap (not libpcap), make sure we have
1427 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1428 * (See comment in main() for details)
1431 relinquish_privs_except_capture(void)
1433 /* If 'started_with_special_privs' (ie: suid) then enable for
1434 * ourself the NET_ADMIN and NET_RAW capabilities and then
1435 * drop our suid privileges.
1437 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1438 * stuff we don't need (and shouldn't have).
1439 * CAP_NET_RAW: Packet capture (raw sockets).
1442 if (started_with_special_privs()) {
1443 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1444 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1446 cap_t caps = cap_init(); /* all capabilities initialized to off */
1448 print_caps("Pre drop, pre set");
1450 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1451 cmdarg_err("prctl() fail return: %s", strerror(errno));
1454 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1455 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1457 if (cap_set_proc(caps)) {
1458 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1460 print_caps("Pre drop, post set");
1462 relinquish_special_privs_perm();
1464 print_caps("Post drop, pre set");
1465 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1466 if (cap_set_proc(caps)) {
1467 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1469 print_caps("Post drop, post set");
1475 #endif /* HAVE_LIBCAP */
1477 /* Take care of byte order in the libpcap headers read from pipes.
1478 * (function taken from wiretap/libpcap.c) */
1480 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1483 /* Byte-swap the record header fields. */
1484 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1485 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1486 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1487 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1490 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1491 swapped, in order to match the BPF header layout.
1493 Unfortunately, some files were, according to a comment in the "libpcap"
1494 source, written with version 2.3 in their headers but without the
1495 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1496 would make no sense - we assume that we need to swap them. */
1497 if (hdr->version_major == 2 &&
1498 (hdr->version_minor < 3 ||
1499 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1502 temp = rechdr->orig_len;
1503 rechdr->orig_len = rechdr->incl_len;
1504 rechdr->incl_len = temp;
1510 * Thread function that reads from a pipe and pushes the data
1511 * to the main application thread.
1514 * XXX Right now we use async queues for basic signaling. The main thread
1515 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1516 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1517 * Iff the read is successful cap_pipe_read pushes an item onto
1518 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1519 * the queues themselves (yet).
1521 * We might want to move some of the cap_pipe_dispatch logic here so that
1522 * we can let cap_pipe_read run independently, queuing up multiple reads
1523 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1525 static void *cap_pipe_read(void *arg)
1527 pcap_options *pcap_opts = (pcap_options *)arg;
1536 while (pcap_opts->cap_pipe_err == PIPOK) {
1537 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1538 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1540 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1542 /* If we try to use read() on a named pipe on Windows with partial
1543 * data it appears to return EOF.
1545 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1546 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1551 last_err = GetLastError();
1552 if (last_err == ERROR_MORE_DATA) {
1554 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1555 pcap_opts->cap_pipe_err = PIPEOF;
1559 pcap_opts->cap_pipe_err = PIPERR;
1562 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1563 pcap_opts->cap_pipe_err = PIPEOF;
1568 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1569 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1572 pcap_opts->cap_pipe_err = PIPEOF;
1576 pcap_opts->cap_pipe_err = PIPERR;
1585 pcap_opts->cap_pipe_bytes_read = bytes_read;
1586 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1587 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1589 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1593 #endif /* USE_THREADS */
1595 /* Provide select() functionality for a single file descriptor
1596 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1598 * Returns the same values as select. If an error is returned,
1599 * the string cap_pipe_err_str should be used instead of errno.
1602 cap_pipe_select(int pipe_fd)
1605 struct timeval timeout;
1608 cap_pipe_err_str = "Unknown error";
1611 FD_SET(pipe_fd, &rfds);
1613 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1614 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1616 sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1618 cap_pipe_err_str = strerror(errno);
1623 /* Mimic pcap_open_live() for pipe captures
1625 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1626 * open it, and read the header.
1628 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1629 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1631 cap_pipe_open_live(char *pipename,
1632 pcap_options *pcap_opts,
1633 struct pcap_hdr *hdr,
1634 char *errmsg, int errmsgl)
1637 ws_statb64 pipe_stat;
1638 struct sockaddr_un sa;
1649 unsigned int bytes_read;
1654 pcap_opts->cap_pipe_fd = -1;
1656 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1658 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1661 * XXX - this blocks until a pcap per-file header has been written to
1662 * the pipe, so it could block indefinitely.
1664 if (strcmp(pipename, "-") == 0) {
1666 fd = 0; /* read from stdin */
1668 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1672 if (ws_stat64(pipename, &pipe_stat) < 0) {
1673 if (errno == ENOENT || errno == ENOTDIR)
1674 pcap_opts->cap_pipe_err = PIPNEXIST;
1676 g_snprintf(errmsg, errmsgl,
1677 "The capture session could not be initiated "
1678 "due to error getting information on pipe/socket: %s", strerror(errno));
1679 pcap_opts->cap_pipe_err = PIPERR;
1683 if (S_ISFIFO(pipe_stat.st_mode)) {
1684 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1686 g_snprintf(errmsg, errmsgl,
1687 "The capture session could not be initiated "
1688 "due to error on pipe open: %s", strerror(errno));
1689 pcap_opts->cap_pipe_err = PIPERR;
1692 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1693 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1695 g_snprintf(errmsg, errmsgl,
1696 "The capture session could not be initiated "
1697 "due to error on socket create: %s", strerror(errno));
1698 pcap_opts->cap_pipe_err = PIPERR;
1701 sa.sun_family = AF_UNIX;
1703 * The Single UNIX Specification says:
1705 * The size of sun_path has intentionally been left undefined.
1706 * This is because different implementations use different sizes.
1707 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1708 * of 104. Since most implementations originate from BSD versions,
1709 * the size is typically in the range 92 to 108.
1711 * Applications should not assume a particular length for sun_path
1712 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1716 * The <sys/un.h> header shall define the sockaddr_un structure,
1717 * which shall include at least the following members:
1719 * sa_family_t sun_family Address family.
1720 * char sun_path[] Socket pathname.
1722 * so we assume that it's an array, with a specified size,
1723 * and that the size reflects the maximum path length.
1725 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1726 /* Path name too long */
1727 g_snprintf(errmsg, errmsgl,
1728 "The capture session coud not be initiated "
1729 "due to error on socket connect: Path name too long");
1730 pcap_opts->cap_pipe_err = PIPERR;
1733 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1735 g_snprintf(errmsg, errmsgl,
1736 "The capture session coud not be initiated "
1737 "due to error on socket connect: %s", strerror(errno));
1738 pcap_opts->cap_pipe_err = PIPERR;
1742 if (S_ISCHR(pipe_stat.st_mode)) {
1744 * Assume the user specified an interface on a system where
1745 * interfaces are in /dev. Pretend we haven't seen it.
1747 pcap_opts->cap_pipe_err = PIPNEXIST;
1750 g_snprintf(errmsg, errmsgl,
1751 "The capture session could not be initiated because\n"
1752 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1753 pcap_opts->cap_pipe_err = PIPERR;
1758 #define PIPE_STR "\\pipe\\"
1759 /* Under Windows, named pipes _must_ have the form
1760 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1762 pncopy = g_strdup(pipename);
1763 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1764 pos = strchr(pncopy + 3, '\\');
1765 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1772 g_snprintf(errmsg, errmsgl,
1773 "The capture session could not be initiated because\n"
1774 "\"%s\" is neither an interface nor a pipe", pipename);
1775 pcap_opts->cap_pipe_err = PIPNEXIST;
1779 /* Wait for the pipe to appear */
1781 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1782 OPEN_EXISTING, 0, NULL);
1784 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1787 if (GetLastError() != ERROR_PIPE_BUSY) {
1788 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1789 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1790 g_snprintf(errmsg, errmsgl,
1791 "The capture session on \"%s\" could not be started "
1792 "due to error on pipe open: %s (error %d)",
1793 pipename, utf_16to8(err_str), GetLastError());
1795 pcap_opts->cap_pipe_err = PIPERR;
1799 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1800 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1801 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1802 g_snprintf(errmsg, errmsgl,
1803 "The capture session on \"%s\" timed out during "
1804 "pipe open: %s (error %d)",
1805 pipename, utf_16to8(err_str), GetLastError());
1807 pcap_opts->cap_pipe_err = PIPERR;
1814 pcap_opts->from_cap_pipe = TRUE;
1817 /* read the pcap header */
1819 while (bytes_read < sizeof magic) {
1820 sel_ret = cap_pipe_select(fd);
1822 g_snprintf(errmsg, errmsgl,
1823 "Unexpected error from select: %s", strerror(errno));
1825 } else if (sel_ret > 0) {
1826 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1829 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1831 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1838 #else /* USE_THREADS */
1839 g_thread_create(&cap_pipe_read, &pcap_opts, FALSE, NULL);
1841 pcap_opts->cap_pipe_buf = (char *) &magic;
1842 pcap_opts->cap_pipe_bytes_read = 0;
1843 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1844 /* We don't have to worry about cap_pipe_read_mtx here */
1845 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1846 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1847 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1848 if (pcap_opts->cap_pipe_bytes_read == 0)
1849 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1851 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1856 #endif /* USE_THREADS */
1860 /* Host that wrote it has our byte order, and was running
1861 a program using either standard or ss990417 libpcap. */
1862 pcap_opts->cap_pipe_byte_swapped = FALSE;
1863 pcap_opts->cap_pipe_modified = FALSE;
1865 case PCAP_MODIFIED_MAGIC:
1866 /* Host that wrote it has our byte order, but was running
1867 a program using either ss990915 or ss991029 libpcap. */
1868 pcap_opts->cap_pipe_byte_swapped = FALSE;
1869 pcap_opts->cap_pipe_modified = TRUE;
1871 case PCAP_SWAPPED_MAGIC:
1872 /* Host that wrote it has a byte order opposite to ours,
1873 and was running a program using either standard or
1874 ss990417 libpcap. */
1875 pcap_opts->cap_pipe_byte_swapped = TRUE;
1876 pcap_opts->cap_pipe_modified = FALSE;
1878 case PCAP_SWAPPED_MODIFIED_MAGIC:
1879 /* Host that wrote it out has a byte order opposite to
1880 ours, and was running a program using either ss990915
1881 or ss991029 libpcap. */
1882 pcap_opts->cap_pipe_byte_swapped = TRUE;
1883 pcap_opts->cap_pipe_modified = TRUE;
1886 /* Not a "libpcap" type we know about. */
1887 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1892 /* Read the rest of the header */
1894 while (bytes_read < sizeof(struct pcap_hdr)) {
1895 sel_ret = cap_pipe_select(fd);
1897 g_snprintf(errmsg, errmsgl,
1898 "Unexpected error from select: %s", strerror(errno));
1900 } else if (sel_ret > 0) {
1901 b = read(fd, ((char *)hdr)+bytes_read,
1902 sizeof(struct pcap_hdr) - bytes_read);
1905 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1907 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1914 #else /* USE_THREADS */
1915 pcap_opts->cap_pipe_buf = (char *) hdr;
1916 pcap_opts->cap_pipe_bytes_read = 0;
1917 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1918 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1919 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1920 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1921 if (pcap_opts->cap_pipe_bytes_read == 0)
1922 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1924 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1928 #endif /* USE_THREADS */
1930 if (pcap_opts->cap_pipe_byte_swapped) {
1931 /* Byte-swap the header fields about which we care. */
1932 hdr->version_major = BSWAP16(hdr->version_major);
1933 hdr->version_minor = BSWAP16(hdr->version_minor);
1934 hdr->snaplen = BSWAP32(hdr->snaplen);
1935 hdr->network = BSWAP32(hdr->network);
1937 pcap_opts->linktype = hdr->network;
1939 if (hdr->version_major < 2) {
1940 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1944 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1945 pcap_opts->cap_pipe_err = PIPOK;
1947 pcap_opts->cap_pipe_fd = fd;
1952 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1953 pcap_opts->cap_pipe_err = PIPERR;
1956 pcap_opts->cap_pipe_fd = -1;
1963 /* We read one record from the pipe, take care of byte order in the record
1964 * header, write the record to the capture file, and update capture statistics. */
1966 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
1968 struct pcap_pkthdr phdr;
1969 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1981 #ifdef LOG_CAPTURE_VERBOSE
1982 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
1985 switch (pcap_opts->cap_pipe_state) {
1987 case STATE_EXPECT_REC_HDR:
1989 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
1992 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
1993 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
1994 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
1995 pcap_opts->cap_pipe_bytes_read = 0;
1998 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
1999 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2000 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2005 case STATE_READ_REC_HDR:
2007 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2008 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2011 result = PD_PIPE_EOF;
2013 result = PD_PIPE_ERR;
2016 pcap_opts->cap_pipe_bytes_read += b;
2017 #else /* USE_THREADS */
2018 g_get_current_time(&wait_time);
2019 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2020 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2021 if (pcap_opts->cap_pipe_err == PIPEOF) {
2022 result = PD_PIPE_EOF;
2024 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2025 result = PD_PIPE_ERR;
2031 #endif /* USE_THREADS */
2032 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2034 result = PD_REC_HDR_READ;
2037 case STATE_EXPECT_DATA:
2039 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2042 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2043 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2044 pcap_opts->cap_pipe_bytes_read = 0;
2047 pcap_opts->cap_pipe_buf = (char *) data;
2048 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2049 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2054 case STATE_READ_DATA:
2056 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2057 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2060 result = PD_PIPE_EOF;
2062 result = PD_PIPE_ERR;
2065 pcap_opts->cap_pipe_bytes_read += b;
2066 #else /* USE_THREADS */
2067 g_get_current_time(&wait_time);
2068 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2069 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2070 if (pcap_opts->cap_pipe_err == PIPEOF) {
2071 result = PD_PIPE_EOF;
2073 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2074 result = PD_PIPE_ERR;
2080 #endif /* USE_THREADS */
2081 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2083 result = PD_DATA_READ;
2087 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2090 } /* switch (ld->cap_pipe_state) */
2093 * We've now read as much data as we were expecting, so process it.
2097 case PD_REC_HDR_READ:
2098 /* We've read the header. Take care of byte order. */
2099 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2100 &pcap_opts->cap_pipe_rechdr.hdr);
2101 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2102 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2103 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2106 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2110 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2111 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2112 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2113 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2114 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2116 capture_loop_packet_cb((u_char *)ld, &phdr, data);
2118 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2122 pcap_opts->cap_pipe_err = PIPEOF;
2127 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2128 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2129 g_snprintf(errmsg, errmsgl,
2130 "Error reading from pipe: %s (error %d)",
2131 utf_16to8(err_str), GetLastError());
2134 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2142 pcap_opts->cap_pipe_err = PIPERR;
2143 /* Return here rather than inside the switch to prevent GCC warning */
2148 /** Open the capture input file (pcap or capture pipe).
2149 * Returns TRUE if it succeeds, FALSE otherwise. */
2151 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2152 char *errmsg, size_t errmsg_len,
2153 char *secondary_errmsg, size_t secondary_errmsg_len)
2155 gchar open_err_str[PCAP_ERRBUF_SIZE];
2156 gchar *sync_msg_str;
2157 interface_options interface_opts;
2158 pcap_options pcap_opts;
2162 gchar *sync_secondary_msg_str;
2163 WORD wVersionRequested;
2167 /* XXX - opening Winsock on tshark? */
2169 /* Initialize Windows Socket if we are in a WIN32 OS
2170 This needs to be done before querying the interface for network/netmask */
2172 /* XXX - do we really require 1.1 or earlier?
2173 Are there any versions that support only 2.0 or higher? */
2174 wVersionRequested = MAKEWORD(1, 1);
2175 err = WSAStartup(wVersionRequested, &wsaData);
2179 case WSASYSNOTREADY:
2180 g_snprintf(errmsg, (gulong) errmsg_len,
2181 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2184 case WSAVERNOTSUPPORTED:
2185 g_snprintf(errmsg, (gulong) errmsg_len,
2186 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2187 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2190 case WSAEINPROGRESS:
2191 g_snprintf(errmsg, (gulong) errmsg_len,
2192 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2196 g_snprintf(errmsg, (gulong) errmsg_len,
2197 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2201 g_snprintf(errmsg, (gulong) errmsg_len,
2202 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2206 g_snprintf(errmsg, (gulong) errmsg_len,
2207 "Couldn't initialize Windows Sockets: error %d", err);
2210 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2214 for (i = 0; i < capture_opts->ifaces->len; i++) {
2215 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2216 pcap_opts.pcap_h = NULL;
2217 #ifdef MUST_DO_SELECT
2218 pcap_opts.pcap_fd = -1;
2220 pcap_opts.pcap_err = FALSE;
2221 pcap_opts.interface_id = i;
2222 pcap_opts.tid = NULL;
2223 pcap_opts.snaplen = 0;
2224 pcap_opts.linktype = -1;
2225 pcap_opts.from_cap_pipe = FALSE;
2226 memset(&pcap_opts.cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2227 memset(&pcap_opts.cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2229 pcap_opts.cap_pipe_h = INVALID_HANDLE_VALUE;
2231 pcap_opts.cap_pipe_fd = -1;
2233 pcap_opts.cap_pipe_modified = FALSE;
2234 pcap_opts.cap_pipe_byte_swapped = FALSE;
2236 pcap_opts.cap_pipe_buf = NULL;
2237 #endif /* USE_THREADS */
2238 pcap_opts.cap_pipe_bytes_to_read = 0;
2239 pcap_opts.cap_pipe_bytes_read = 0;
2240 pcap_opts.cap_pipe_state = 0;
2241 pcap_opts.cap_pipe_err = PIPOK;
2243 pcap_opts.cap_pipe_read_mtx = g_mutex_new();
2244 pcap_opts.cap_pipe_pending_q = g_async_queue_new();
2245 pcap_opts.cap_pipe_done_q = g_async_queue_new();
2248 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2249 pcap_opts.pcap_h = open_capture_device(&interface_opts, capture_opts, &open_err_str);
2251 if (pcap_opts.pcap_h != NULL) {
2252 /* we've opened "iface" as a network device */
2254 /* try to set the capture buffer size */
2255 if (interface_opts.buffer_size > 1 &&
2256 pcap_setbuff(pcap_opts.pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2257 sync_secondary_msg_str = g_strdup_printf(
2258 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2259 "the default of 1MB will be used.\n"
2261 "Nonetheless, the capture is started.\n",
2262 interface_opts.buffer_size);
2263 report_capture_error("Couldn't set the capture buffer size!",
2264 sync_secondary_msg_str);
2265 g_free(sync_secondary_msg_str);
2269 #if defined(HAVE_PCAP_SETSAMPLING)
2270 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2271 struct pcap_samp *samp;
2273 if ((samp = pcap_setsampling(pcap_opts.pcap_h)) != NULL) {
2274 switch (interface_opts.sampling_method) {
2275 case CAPTURE_SAMP_BY_COUNT:
2276 samp->method = PCAP_SAMP_1_EVERY_N;
2279 case CAPTURE_SAMP_BY_TIMER:
2280 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2284 sync_msg_str = g_strdup_printf(
2285 "Unknown sampling method %d specified,\n"
2286 "continue without packet sampling",
2287 interface_opts->sampling_method);
2288 report_capture_error("Couldn't set the capture "
2289 "sampling", sync_msg_str);
2290 g_free(sync_msg_str);
2292 samp->value = interface_opts->sampling_param;
2294 report_capture_error("Couldn't set the capture sampling",
2295 "Cannot get packet sampling data structure");
2301 /* setting the data link type only works on real interfaces */
2302 if (!set_pcap_linktype(pcap_opts.pcap_h, interface_opts.linktype, interface_opts.name,
2304 secondary_errmsg, secondary_errmsg_len)) {
2305 g_array_append_val(ld->pcaps, pcap_opts);
2308 pcap_opts.linktype = get_pcap_linktype(pcap_opts.pcap_h, interface_opts.name);
2310 /* We couldn't open "iface" as a network device. */
2311 /* Try to open it as a pipe */
2312 cap_pipe_open_live(interface_opts.name, &pcap_opts, &pcap_opts.cap_pipe_hdr, errmsg, (int) errmsg_len);
2315 if (pcap_opts.cap_pipe_fd == -1) {
2317 if (pcap_opts.cap_pipe_h == INVALID_HANDLE_VALUE) {
2319 if (pcap_opts.cap_pipe_err == PIPNEXIST) {
2320 /* Pipe doesn't exist, so output message for interface */
2321 get_capture_device_open_failure_messages(open_err_str,
2322 interface_opts.name,
2326 secondary_errmsg_len);
2329 * Else pipe (or file) does exist and cap_pipe_open_live() has
2332 g_array_append_val(ld->pcaps, pcap_opts);
2335 /* cap_pipe_open_live() succeeded; don't want
2336 error message from pcap_open_live() */
2337 open_err_str[0] = '\0';
2341 /* XXX - will this work for tshark? */
2342 #ifdef MUST_DO_SELECT
2343 if (!pcap_opts.from_cap_pipe) {
2344 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2345 pcap_opts.pcap_fd = pcap_get_selectable_fd(pcap_opts.pcap_h);
2347 pcap_opts.pcap_fd = pcap_fileno(pcap_opts.pcap_h);
2352 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2353 returned a warning; print it, but keep capturing. */
2354 if (open_err_str[0] != '\0') {
2355 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2356 report_capture_error(sync_msg_str, "");
2357 g_free(sync_msg_str);
2359 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2360 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2361 g_array_append_val(ld->pcaps, pcap_opts);
2367 /* close the capture input file (pcap or capture pipe) */
2368 static void capture_loop_close_input(loop_data *ld)
2371 pcap_options pcap_opts;
2373 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2375 for (i = 0; i < ld->pcaps->len; i++) {
2376 pcap_opts = g_array_index(ld->pcaps, pcap_options, i);
2377 /* if open, close the capture pipe "input file" */
2379 if (pcap_opts.cap_pipe_fd >= 0) {
2380 g_assert(pcap_opts.from_cap_pipe);
2381 ws_close(pcap_opts.cap_pipe_fd);
2382 pcap_opts.cap_pipe_fd = -1;
2385 if (pcap_opts.cap_pipe_h != INVALID_HANDLE_VALUE) {
2386 CloseHandle(pcap_opts.cap_pipe_h);
2387 pcap_opts.cap_pipe_h = INVALID_HANDLE_VALUE;
2390 /* if open, close the pcap "input file" */
2391 if (pcap_opts.pcap_h != NULL) {
2392 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", pcap_opts.pcap_h);
2393 pcap_close(pcap_opts.pcap_h);
2394 pcap_opts.pcap_h = NULL;
2401 /* Shut down windows sockets */
2407 /* init the capture filter */
2408 static initfilter_status_t
2409 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2410 gchar * name, gchar * cfilter)
2412 struct bpf_program fcode;
2414 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2416 /* capture filters only work on real interfaces */
2417 if (cfilter && !from_cap_pipe) {
2418 /* A capture filter was specified; set it up. */
2419 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2420 /* Treat this specially - our caller might try to compile this
2421 as a display filter and, if that succeeds, warn the user that
2422 the display and capture filter syntaxes are different. */
2423 return INITFILTER_BAD_FILTER;
2425 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2426 #ifdef HAVE_PCAP_FREECODE
2427 pcap_freecode(&fcode);
2429 return INITFILTER_OTHER_ERROR;
2431 #ifdef HAVE_PCAP_FREECODE
2432 pcap_freecode(&fcode);
2436 return INITFILTER_NO_ERROR;
2440 /* set up to write to the already-opened capture output file/files */
2442 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2446 pcap_options pcap_opts;
2447 interface_options interface_opts;
2448 gboolean successful;
2450 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2452 if ((capture_opts->use_pcapng == FALSE) &&
2453 (capture_opts->ifaces->len > 1)) {
2454 g_snprintf(errmsg, errmsg_len,
2455 "Using PCAPNG is required for capturing on mulitple interfaces! Use the -n option.");
2459 /* Set up to write to the capture file. */
2460 if (capture_opts->multi_files_on) {
2461 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2463 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2466 if (capture_opts->use_pcapng) {
2469 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2470 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err);
2471 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2472 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2473 pcap_opts = g_array_index(ld->pcaps, pcap_options, i);
2474 if (pcap_opts.from_cap_pipe) {
2475 pcap_opts.snaplen = pcap_opts.cap_pipe_hdr.snaplen;
2477 pcap_opts.snaplen = pcap_snapshot(pcap_opts.pcap_h);
2479 successful = libpcap_write_interface_description_block(ld->pdh,
2480 interface_opts.name,
2481 interface_opts.cfilter,
2488 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2489 pcap_opts = g_array_index(ld->pcaps, pcap_options, 0);
2490 if (pcap_opts.from_cap_pipe) {
2491 pcap_opts.snaplen = pcap_opts.cap_pipe_hdr.snaplen;
2493 pcap_opts.snaplen = pcap_snapshot(pcap_opts.pcap_h);
2495 successful = libpcap_write_file_header(ld->pdh, pcap_opts.linktype, pcap_opts.snaplen,
2496 &ld->bytes_written, &err);
2504 if (ld->pdh == NULL) {
2505 /* We couldn't set up to write to the capture file. */
2506 /* XXX - use cf_open_error_message from tshark instead? */
2511 g_snprintf(errmsg, errmsg_len,
2512 "The file to which the capture would be"
2513 " saved (\"%s\") could not be opened: Error %d.",
2514 capture_opts->save_file, err);
2516 g_snprintf(errmsg, errmsg_len,
2517 "The file to which the capture would be"
2518 " saved (\"%s\") could not be opened: %s.",
2519 capture_opts->save_file, strerror(err));
2531 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2535 pcap_options pcap_opts;
2537 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2539 if (capture_opts->multi_files_on) {
2540 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2542 if (capture_opts->use_pcapng) {
2543 for (i = 0; i < global_ld.pcaps->len; i++) {
2544 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2545 if (!pcap_opts.from_cap_pipe) {
2546 libpcap_write_interface_statistics_block(ld->pdh, i, pcap_opts.pcap_h, &ld->bytes_written, err_close);
2550 return libpcap_dump_close(ld->pdh, err_close);
2554 /* dispatch incoming packets (pcap or capture pipe)
2556 * Waits for incoming packets to be available, and calls pcap_dispatch()
2557 * to cause them to be processed.
2559 * Returns the number of packets which were processed.
2561 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2562 * packet-batching behaviour does not cause packets to get held back
2566 capture_loop_dispatch(capture_options *capture_opts _U_, loop_data *ld,
2567 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2570 gint packet_count_before;
2571 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2576 packet_count_before = ld->packet_count;
2577 if (pcap_opts->from_cap_pipe) {
2578 /* dispatch from capture pipe */
2579 #ifdef LOG_CAPTURE_VERBOSE
2580 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2583 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2585 if (sel_ret < 0 && errno != EINTR) {
2586 g_snprintf(errmsg, errmsg_len,
2587 "Unexpected error from select: %s", strerror(errno));
2588 report_capture_error(errmsg, please_report);
2593 * "select()" says we can read from the pipe without blocking
2595 #endif /* USE_THREADS */
2596 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2606 /* dispatch from pcap */
2607 #ifdef MUST_DO_SELECT
2609 * If we have "pcap_get_selectable_fd()", we use it to get the
2610 * descriptor on which to select; if that's -1, it means there
2611 * is no descriptor on which you can do a "select()" (perhaps
2612 * because you're capturing on a special device, and that device's
2613 * driver unfortunately doesn't support "select()", in which case
2614 * we don't do the select - which means it might not be possible
2615 * to stop a capture until a packet arrives. If that's unacceptable,
2616 * plead with whoever supplies the software for that device to add
2617 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2618 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2619 * later, so it can use pcap_breakloop().
2621 #ifdef LOG_CAPTURE_VERBOSE
2622 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2624 if (pcap_opts->pcap_fd != -1) {
2625 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2628 * "select()" says we can read from it without blocking; go for
2631 * We don't have pcap_breakloop(), so we only process one packet
2632 * per pcap_dispatch() call, to allow a signal to stop the
2633 * processing immediately, rather than processing all packets
2634 * in a batch before quitting.
2636 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_packet_cb,
2637 (u_char *)&(pcap_opts->interface_id));
2640 /* Error, rather than pcap_breakloop(). */
2641 pcap_opts->pcap_err = TRUE;
2643 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2646 if (sel_ret < 0 && errno != EINTR) {
2647 g_snprintf(errmsg, errmsg_len,
2648 "Unexpected error from select: %s", strerror(errno));
2649 report_capture_error(errmsg, please_report);
2655 #endif /* MUST_DO_SELECT */
2657 /* dispatch from pcap without select */
2659 #ifdef LOG_CAPTURE_VERBOSE
2660 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2664 * On Windows, we don't support asynchronously telling a process to
2665 * stop capturing; instead, we check for an indication on a pipe
2666 * after processing packets. We therefore process only one packet
2667 * at a time, so that we can check the pipe after every packet.
2669 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_packet_cb, (u_char *) ld);
2671 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_packet_cb, (u_char *) ld);
2675 /* Error, rather than pcap_breakloop(). */
2676 pcap_opts->pcap_err = TRUE;
2678 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2680 #else /* pcap_next_ex */
2681 #ifdef LOG_CAPTURE_VERBOSE
2682 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2684 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2687 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2688 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2689 * This should be fixed in the WinPcap 4.0 alpha release.
2691 * For reference, an example remote interface:
2692 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2695 /* emulate dispatch from pcap */
2698 struct pcap_pkthdr *pkt_header;
2703 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1)
2704 capture_loop_packet_cb( (u_char *) ld, pkt_header, pkt_data);
2707 pcap_opts->pcap_err = TRUE;
2711 #endif /* pcap_next_ex */
2715 #ifdef LOG_CAPTURE_VERBOSE
2716 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2719 return ld->packet_count - packet_count_before;
2723 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2724 * want to grab only the characters between the '{' and '}' delimiters.
2726 * Returns a GString that must be freed with g_string_free(). */
2728 isolate_uuid(const char *iface)
2733 ptr = strchr(iface, '{');
2735 return g_string_new(iface);
2736 gstr = g_string_new(ptr + 1);
2738 ptr = strchr(gstr->str, '}');
2742 gstr = g_string_truncate(gstr, ptr - gstr->str);
2747 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2748 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2750 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2751 char *errmsg, int errmsg_len)
2754 gchar *capfile_name;
2756 gboolean is_tempfile;
2758 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2759 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2761 if (capture_opts->save_file != NULL) {
2762 /* We return to the caller while the capture is in progress.
2763 * Therefore we need to take a copy of save_file in
2764 * case the caller destroys it after we return.
2766 capfile_name = g_strdup(capture_opts->save_file);
2768 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2769 if (capture_opts->multi_files_on) {
2770 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2771 g_snprintf(errmsg, errmsg_len,
2772 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2773 g_free(capfile_name);
2776 if (strcmp(capfile_name, "-") == 0) {
2777 /* write to stdout */
2780 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2781 _setmode(1, O_BINARY);
2784 } /* if (...output_to_pipe ... */
2787 if (capture_opts->multi_files_on) {
2788 /* ringbuffer is enabled */
2789 *save_file_fd = ringbuf_init(capfile_name,
2790 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2791 capture_opts->group_read_access);
2793 /* we need the ringbuf name */
2794 if(*save_file_fd != -1) {
2795 g_free(capfile_name);
2796 capfile_name = g_strdup(ringbuf_current_filename());
2799 /* Try to open/create the specified file for use as a capture buffer. */
2800 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2801 (capture_opts->group_read_access) ? 0640 : 0600);
2804 is_tempfile = FALSE;
2806 /* Choose a random name for the temporary capture buffer */
2810 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1).name);
2811 prefix = g_strconcat("wireshark_", g_basename(iface->str), NULL);
2812 g_string_free(iface, TRUE);
2814 prefix = g_strconcat("wireshark_", g_basename(g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1).name), NULL);
2816 *save_file_fd = create_tempfile(&tmpname, prefix);
2818 capfile_name = g_strdup(tmpname);
2822 /* did we fail to open the output file? */
2823 if (*save_file_fd == -1) {
2825 g_snprintf(errmsg, errmsg_len,
2826 "The temporary file to which the capture would be saved (\"%s\") "
2827 "could not be opened: %s.", capfile_name, strerror(errno));
2829 if (capture_opts->multi_files_on) {
2830 ringbuf_error_cleanup();
2833 g_snprintf(errmsg, errmsg_len,
2834 "The file to which the capture would be saved (\"%s\") "
2835 "could not be opened: %s.", capfile_name,
2838 g_free(capfile_name);
2842 if(capture_opts->save_file != NULL) {
2843 g_free(capture_opts->save_file);
2845 capture_opts->save_file = capfile_name;
2846 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2847 "g_free(capfile_name)". */
2853 /* Do the work of handling either the file size or file duration capture
2854 conditions being reached, and switching files or stopping. */
2856 do_file_switch_or_stop(capture_options *capture_opts,
2857 condition *cnd_autostop_files,
2858 condition *cnd_autostop_size,
2859 condition *cnd_file_duration)
2862 pcap_options pcap_opts;
2863 interface_options interface_opts;
2864 gboolean successful;
2866 if (capture_opts->multi_files_on) {
2867 if (cnd_autostop_files != NULL &&
2868 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2869 /* no files left: stop here */
2870 global_ld.go = FALSE;
2874 /* Switch to the next ringbuffer file */
2875 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2876 &global_ld.save_file_fd, &global_ld.err)) {
2878 /* File switch succeeded: reset the conditions */
2879 global_ld.bytes_written = 0;
2880 if (capture_opts->use_pcapng) {
2883 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2884 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &(global_ld.bytes_written), &global_ld.err);
2885 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2886 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2887 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2888 successful = libpcap_write_interface_description_block(global_ld.pdh,
2889 interface_opts.name,
2890 interface_opts.cfilter,
2893 &(global_ld.bytes_written),
2897 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2898 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, 0);
2899 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts.linktype, pcap_opts.snaplen,
2900 &global_ld.bytes_written, &global_ld.err);
2903 fclose(global_ld.pdh);
2904 global_ld.pdh = NULL;
2905 global_ld.go = FALSE;
2908 if (cnd_autostop_size)
2909 cnd_reset(cnd_autostop_size);
2910 if (cnd_file_duration)
2911 cnd_reset(cnd_file_duration);
2912 libpcap_dump_flush(global_ld.pdh, NULL);
2914 report_packet_count(global_ld.inpkts_to_sync_pipe);
2915 global_ld.inpkts_to_sync_pipe = 0;
2916 report_new_capture_file(capture_opts->save_file);
2918 /* File switch failed: stop here */
2919 global_ld.go = FALSE;
2923 /* single file, stop now */
2924 global_ld.go = FALSE;
2930 /* Do the low-level work of a capture.
2931 Returns TRUE if it succeeds, FALSE otherwise. */
2933 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
2936 time_t upd_time, cur_time;
2938 struct timeval upd_time, cur_time;
2942 condition *cnd_file_duration = NULL;
2943 condition *cnd_autostop_files = NULL;
2944 condition *cnd_autostop_size = NULL;
2945 condition *cnd_autostop_duration = NULL;
2948 gboolean cfilter_error = FALSE;
2949 char errmsg[MSG_MAX_LENGTH+1];
2950 char secondary_errmsg[MSG_MAX_LENGTH+1];
2951 pcap_options pcap_opts;
2952 interface_options interface_opts;
2955 interface_opts = capture_opts->default_options;
2957 *secondary_errmsg = '\0';
2959 /* init the loop data */
2960 global_ld.go = TRUE;
2961 global_ld.packet_count = 0;
2963 global_ld.report_packet_count = FALSE;
2965 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options));
2966 if (capture_opts->has_autostop_packets)
2967 global_ld.packet_max = capture_opts->autostop_packets;
2969 global_ld.packet_max = 0; /* no limit */
2970 global_ld.inpkts_to_sync_pipe = 0;
2971 global_ld.err = 0; /* no error seen yet */
2972 global_ld.pdh = NULL;
2973 global_ld.autostop_files = 0;
2974 global_ld.save_file_fd = -1;
2976 /* We haven't yet gotten the capture statistics. */
2977 *stats_known = FALSE;
2979 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
2980 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
2982 /* open the "input file" from network interface or capture pipe */
2983 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
2984 secondary_errmsg, sizeof(secondary_errmsg))) {
2987 for (i = 0; i < capture_opts->ifaces->len; i++) {
2988 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2989 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2990 /* init the input filter from the network interface (capture pipe will do nothing) */
2991 switch (capture_loop_init_filter(pcap_opts.pcap_h, pcap_opts.from_cap_pipe,
2992 interface_opts.name,
2993 interface_opts.cfilter)) {
2995 case INITFILTER_NO_ERROR:
2998 case INITFILTER_BAD_FILTER:
2999 cfilter_error = TRUE;
3000 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts.pcap_h));
3003 case INITFILTER_OTHER_ERROR:
3004 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3005 pcap_geterr(pcap_opts.pcap_h));
3006 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3011 /* If we're supposed to write to a capture file, open it for output
3012 (temporary/specified name/ringbuffer) */
3013 if (capture_opts->saving_to_file) {
3014 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3015 errmsg, sizeof(errmsg))) {
3019 /* set up to write to the already-opened capture output file/files */
3020 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3025 /* XXX - capture SIGTERM and close the capture, in case we're on a
3026 Linux 2.0[.x] system and you have to explicitly close the capture
3027 stream in order to turn promiscuous mode off? We need to do that
3028 in other places as well - and I don't think that works all the
3029 time in any case, due to libpcap bugs. */
3031 /* Well, we should be able to start capturing.
3033 Sync out the capture file, so the header makes it to the file system,
3034 and send a "capture started successfully and capture file created"
3035 message to our parent so that they'll open the capture file and
3036 update its windows to indicate that we have a live capture in
3038 libpcap_dump_flush(global_ld.pdh, NULL);
3039 report_new_capture_file(capture_opts->save_file);
3042 /* initialize capture stop (and alike) conditions */
3043 init_capture_stop_conditions();
3044 /* create stop conditions */
3045 if (capture_opts->has_autostop_filesize)
3047 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3048 if (capture_opts->has_autostop_duration)
3049 cnd_autostop_duration =
3050 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3052 if (capture_opts->multi_files_on) {
3053 if (capture_opts->has_file_duration)
3055 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3057 if (capture_opts->has_autostop_files)
3058 cnd_autostop_files =
3059 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3062 /* init the time values */
3064 upd_time = GetTickCount();
3066 gettimeofday(&upd_time, NULL);
3069 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3071 /* WOW, everything is prepared! */
3072 /* please fasten your seat belts, we will enter now the actual capture loop */
3073 while (global_ld.go) {
3074 /* dispatch incoming packets */
3075 inpkts = capture_loop_dispatch(capture_opts, &global_ld, errmsg,
3076 sizeof(errmsg), &pcap_opts);
3079 /* Were we asked to print packet counts by the SIGINFO handler? */
3080 if (global_ld.report_packet_count) {
3081 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3082 plurality(global_ld.packet_count, "", "s"));
3083 global_ld.report_packet_count = FALSE;
3088 /* any news from our parent (signal pipe)? -> just stop the capture */
3089 if (!signal_pipe_check_running()) {
3090 global_ld.go = FALSE;
3095 global_ld.inpkts_to_sync_pipe += inpkts;
3097 /* check capture size condition */
3098 if (cnd_autostop_size != NULL &&
3099 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3100 /* Capture size limit reached, do we have another file? */
3101 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3102 cnd_autostop_size, cnd_file_duration))
3104 } /* cnd_autostop_size */
3105 if (capture_opts->output_to_pipe) {
3106 libpcap_dump_flush(global_ld.pdh, NULL);
3110 /* Only update once every 500ms so as not to overload slow displays.
3111 * This also prevents too much context-switching between the dumpcap
3112 * and wireshark processes.
3114 #define DUMPCAP_UPD_TIME 500
3117 cur_time = GetTickCount();
3118 if ( (cur_time - upd_time) > DUMPCAP_UPD_TIME) {
3120 gettimeofday(&cur_time, NULL);
3121 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3122 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3125 upd_time = cur_time;
3128 if (pcap_stats(pch, stats) >= 0) {
3129 *stats_known = TRUE;
3132 /* Let the parent process know. */
3133 if (global_ld.inpkts_to_sync_pipe) {
3135 libpcap_dump_flush(global_ld.pdh, NULL);
3137 /* Send our parent a message saying we've written out
3138 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3140 report_packet_count(global_ld.inpkts_to_sync_pipe);
3142 global_ld.inpkts_to_sync_pipe = 0;
3145 /* check capture duration condition */
3146 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3147 /* The maximum capture time has elapsed; stop the capture. */
3148 global_ld.go = FALSE;
3152 /* check capture file duration condition */
3153 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3154 /* duration limit reached, do we have another file? */
3155 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3156 cnd_autostop_size, cnd_file_duration))
3158 } /* cnd_file_duration */
3162 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3164 /* delete stop conditions */
3165 if (cnd_file_duration != NULL)
3166 cnd_delete(cnd_file_duration);
3167 if (cnd_autostop_files != NULL)
3168 cnd_delete(cnd_autostop_files);
3169 if (cnd_autostop_size != NULL)
3170 cnd_delete(cnd_autostop_size);
3171 if (cnd_autostop_duration != NULL)
3172 cnd_delete(cnd_autostop_duration);
3174 /* did we had a pcap (input) error? */
3175 for (i = 0; i < capture_opts->ifaces->len; i++) {
3176 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3177 if (pcap_opts.pcap_err) {
3178 /* On Linux, if an interface goes down while you're capturing on it,
3179 you'll get a "recvfrom: Network is down" or
3180 "The interface went down" error (ENETDOWN).
3181 (At least you will if strerror() doesn't show a local translation
3184 On FreeBSD and OS X, if a network adapter disappears while
3185 you're capturing on it, you'll get a "read: Device not configured"
3186 error (ENXIO). (See previous parenthetical note.)
3188 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3190 These should *not* be reported to the Wireshark developers. */
3193 cap_err_str = pcap_geterr(pcap_opts.pcap_h);
3194 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3195 strcmp(cap_err_str, "The interface went down") == 0 ||
3196 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3197 strcmp(cap_err_str, "read: I/O error") == 0 ||
3198 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3199 report_capture_error("The network adapter on which the capture was being done "
3200 "is no longer running; the capture has stopped.",
3203 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3205 report_capture_error(errmsg, please_report);
3208 } else if (pcap_opts.from_cap_pipe && pcap_opts.cap_pipe_err == PIPERR) {
3209 report_capture_error(errmsg, "");
3213 /* did we have an output error while capturing? */
3214 if (global_ld.err == 0) {
3217 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3218 global_ld.err, FALSE);
3219 report_capture_error(errmsg, please_report);
3223 if (capture_opts->saving_to_file) {
3224 /* close the output file */
3225 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3229 /* there might be packets not yet notified to the parent */
3230 /* (do this after closing the file, so all packets are already flushed) */
3231 if(global_ld.inpkts_to_sync_pipe) {
3233 report_packet_count(global_ld.inpkts_to_sync_pipe);
3234 global_ld.inpkts_to_sync_pipe = 0;
3237 /* If we've displayed a message about a write error, there's no point
3238 in displaying another message about an error on close. */
3239 if (!close_ok && write_ok) {
3240 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3242 report_capture_error(errmsg, "");
3246 * XXX We exhibit different behaviour between normal mode and sync mode
3247 * when the pipe is stdin and not already at EOF. If we're a child, the
3248 * parent's stdin isn't closed, so if the user starts another capture,
3249 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3250 * will say "Unrecognized libpcap format". On the other hand, in normal
3251 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3254 report_capture_count(); /* print final capture count only if (quiet && !capture_child) */
3256 /* get packet drop statistics from pcap */
3257 for (i = 0; i < capture_opts->ifaces->len; i++) {
3258 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3259 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3260 if (pcap_opts.pcap_h != NULL) {
3261 g_assert(!pcap_opts.from_cap_pipe);
3262 /* Get the capture statistics, so we know how many packets were dropped. */
3263 if (pcap_stats(pcap_opts.pcap_h, stats) >= 0) {
3264 *stats_known = TRUE;
3265 /* Let the parent process know. */
3266 report_packet_drops(stats->ps_recv, stats->ps_drop, interface_opts.name);
3268 g_snprintf(errmsg, sizeof(errmsg),
3269 "Can't get packet-drop statistics: %s",
3270 pcap_geterr(pcap_opts.pcap_h));
3271 report_capture_error(errmsg, please_report);
3276 /* close the input file (pcap or capture pipe) */
3277 capture_loop_close_input(&global_ld);
3279 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3281 /* ok, if the write and the close were successful. */
3282 return write_ok && close_ok;
3285 if (capture_opts->multi_files_on) {
3286 /* cleanup ringbuffer */
3287 ringbuf_error_cleanup();
3289 /* We can't use the save file, and we have no FILE * for the stream
3290 to close in order to close it, so close the FD directly. */
3291 if (global_ld.save_file_fd != -1) {
3292 ws_close(global_ld.save_file_fd);
3295 /* We couldn't even start the capture, so get rid of the capture
3297 if (capture_opts->save_file != NULL) {
3298 ws_unlink(capture_opts->save_file);
3299 g_free(capture_opts->save_file);
3302 capture_opts->save_file = NULL;
3304 report_cfilter_error(interface_opts.cfilter, errmsg);
3306 report_capture_error(errmsg, secondary_errmsg);
3308 /* close the input file (pcap or cap_pipe) */
3309 capture_loop_close_input(&global_ld);
3311 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3317 static void capture_loop_stop(void)
3319 #ifdef HAVE_PCAP_BREAKLOOP
3321 pcap_options pcap_opts;
3323 for (i = 0; i < global_ld.pcaps->len; i++) {
3324 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3325 if (pcap_opts.pcap_h != NULL)
3326 pcap_breakloop(pcap_opts.pcap_h);
3329 global_ld.go = FALSE;
3334 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3335 int err, gboolean is_close)
3340 g_snprintf(errmsg, errmsglen,
3341 "Not all the packets could be written to the file"
3342 " to which the capture was being saved\n"
3343 "(\"%s\") because there is no space left on the file system\n"
3344 "on which that file resides.",
3350 g_snprintf(errmsg, errmsglen,
3351 "Not all the packets could be written to the file"
3352 " to which the capture was being saved\n"
3353 "(\"%s\") because you are too close to, or over,"
3354 " your disk quota\n"
3355 "on the file system on which that file resides.",
3362 g_snprintf(errmsg, errmsglen,
3363 "The file to which the capture was being saved\n"
3364 "(\"%s\") could not be closed: %s.",
3365 fname, strerror(err));
3367 g_snprintf(errmsg, errmsglen,
3368 "An error occurred while writing to the file"
3369 " to which the capture was being saved\n"
3371 fname, strerror(err));
3378 /* one packet was captured, process it */
3380 capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
3383 loop_data *ld = (loop_data *) (void *) user;
3386 /* We may be called multiple times from pcap_dispatch(); if we've set
3387 the "stop capturing" flag, ignore this packet, as we're not
3388 supposed to be saving any more packets. */
3393 gboolean successful;
3395 /* We're supposed to write the packet to a file; do so.
3396 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3397 "ld->err" to the error. */
3398 if (global_capture_opts.use_pcapng) {
3399 successful = libpcap_write_enhanced_packet_block(ld->pdh, phdr, 0, pd, &ld->bytes_written, &err);
3401 successful = libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err);
3408 /* if the user told us to stop after x packets, do we already have enough? */
3409 if ((ld->packet_max > 0) && (ld->packet_count >= ld->packet_max)) {
3417 /* And now our feature presentation... [ fade to music ] */
3419 main(int argc, char *argv[])
3422 gboolean arg_error = FALSE;
3429 struct sigaction action, oldaction;
3432 gboolean start_capture = TRUE;
3433 gboolean stats_known;
3434 struct pcap_stat stats;
3435 GLogLevelFlags log_flags;
3436 gboolean list_interfaces = FALSE;
3437 gboolean list_link_layer_types = FALSE;
3438 #ifdef HAVE_BPF_IMAGE
3439 gboolean print_bpf_code = FALSE;
3441 gboolean machine_readable = FALSE;
3442 gboolean print_statistics = FALSE;
3443 int status, run_once_args = 0;
3446 #if defined(__APPLE__) && defined(__LP64__)
3447 struct utsname osinfo;
3451 /* Convert our arg list to UTF-8. */
3452 wc_argv = CommandLineToArgvW(GetCommandLineW(), &wc_argc);
3453 if (wc_argv && wc_argc == argc) {
3454 for (i = 0; i < argc; i++) {
3455 argv[i] = g_utf16_to_utf8(wc_argv[i], -1, NULL, NULL, NULL);
3457 } /* XXX else bail because something is horribly, horribly wrong? */
3462 * Initialize our DLL search path. MUST be called before LoadLibrary
3465 ws_init_dll_search_path();
3468 #ifdef HAVE_PCAP_REMOTE
3469 #define OPTSTRING_A "A:"
3470 #define OPTSTRING_r "r"
3471 #define OPTSTRING_u "u"
3473 #define OPTSTRING_A ""
3474 #define OPTSTRING_r ""
3475 #define OPTSTRING_u ""
3478 #ifdef HAVE_PCAP_SETSAMPLING
3479 #define OPTSTRING_m "m:"
3481 #define OPTSTRING_m ""
3484 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3485 #define OPTSTRING_B "B:"
3487 #define OPTSTRING_B ""
3488 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3490 #ifdef HAVE_PCAP_CREATE
3491 #define OPTSTRING_I "I"
3493 #define OPTSTRING_I ""
3496 #ifdef HAVE_BPF_IMAGE
3497 #define OPTSTRING_d "d"
3499 #define OPTSTRING_d ""
3502 #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:"
3504 #ifdef DEBUG_CHILD_DUMPCAP
3505 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3506 fprintf (stderr, "Unable to open debug log file !\n");
3511 #if defined(__APPLE__) && defined(__LP64__)
3513 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3514 * a bug workaround - timeouts less than 1 second don't work with libpcap
3515 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3516 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3517 * The problem is extremely unlikely to be reintroduced in a future
3520 if (uname(&osinfo) == 0) {
3522 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3523 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3524 * number of 10.0.0, not 10.1.0 - go figure).
3526 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3527 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3528 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3529 need_timeout_workaround = TRUE;
3534 * Determine if dumpcap is being requested to run in a special
3535 * capture_child mode by going thru the command line args to see if
3536 * a -Z is present. (-Z is a hidden option).
3538 * The primary result of running in capture_child mode is that
3539 * all messages sent out on stderr are in a special type/len/string
3540 * format to allow message processing by type. These messages include
3541 * error messages if dumpcap fails to start the operation it was
3542 * requested to do, as well as various "status" messages which are sent
3543 * when an actual capture is in progress, and a "success" message sent
3544 * if dumpcap was requested to perform an operation other than a
3547 * Capture_child mode would normally be requested by a parent process
3548 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3549 * to which dumpcap stderr has been redirected. It might also have
3550 * another pipe to obtain dumpcap stdout output; for operations other
3551 * than a capture, that information is formatted specially for easier
3552 * parsing by the parent process.
3554 * Capture_child mode needs to be determined immediately upon
3555 * startup so that any messages generated by dumpcap in this mode
3556 * (eg: during initialization) will be formatted properly.
3559 for (i=1; i<argc; i++) {
3560 if (strcmp("-Z", argv[i]) == 0) {
3561 capture_child = TRUE;
3562 machine_readable = TRUE; /* request machine-readable output */
3564 /* set output pipe to binary mode, to avoid ugly text conversions */
3565 _setmode(2, O_BINARY);
3570 /* The default_log_handler will use stdout, which makes trouble in */
3571 /* capture child mode, as it uses stdout for it's sync_pipe. */
3572 /* So: the filtering is done in the console_log_handler and not here.*/
3573 /* We set the log handlers right up front to make sure that any log */
3574 /* messages when running as child will be sent back to the parent */
3575 /* with the correct format. */
3579 G_LOG_LEVEL_CRITICAL|
3580 G_LOG_LEVEL_WARNING|
3581 G_LOG_LEVEL_MESSAGE|
3584 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3586 g_log_set_handler(NULL,
3588 console_log_handler, NULL /* user_data */);
3589 g_log_set_handler(LOG_DOMAIN_MAIN,
3591 console_log_handler, NULL /* user_data */);
3592 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3594 console_log_handler, NULL /* user_data */);
3595 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3597 console_log_handler, NULL /* user_data */);
3599 /* Initialize the thread system */
3600 if (!g_thread_supported())
3601 g_thread_init(NULL);
3603 /* Load wpcap if possible. Do this before collecting the run-time version information */
3606 /* ... and also load the packet.dll from wpcap */
3607 /* XXX - currently not required, may change later. */
3608 /*wpcap_packet_load();*/
3610 /* Start windows sockets */
3611 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3613 /* Set handler for Ctrl+C key */
3614 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3616 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3618 action.sa_handler = capture_cleanup_handler;
3620 * Arrange that system calls not get restarted, because when
3621 * our signal handler returns we don't want to restart
3622 * a call that was waiting for packets to arrive.
3624 action.sa_flags = 0;
3625 sigemptyset(&action.sa_mask);
3626 sigaction(SIGTERM, &action, NULL);
3627 sigaction(SIGINT, &action, NULL);
3628 sigaction(SIGPIPE, &action, NULL);
3629 sigaction(SIGHUP, NULL, &oldaction);
3630 if (oldaction.sa_handler == SIG_DFL)
3631 sigaction(SIGHUP, &action, NULL);
3634 /* Catch SIGINFO and, if we get it and we're capturing in
3635 quiet mode, report the number of packets we've captured. */
3636 action.sa_handler = report_counts_siginfo;
3637 action.sa_flags = SA_RESTART;
3638 sigemptyset(&action.sa_mask);
3639 sigaction(SIGINFO, &action, NULL);
3640 #endif /* SIGINFO */
3643 /* ----------------------------------------------------------------- */
3644 /* Privilege and capability handling */
3646 /* 1. Running not as root or suid root; no special capabilities. */
3649 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3652 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3654 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3655 /* capabilities; Drop all other capabilities; */
3656 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3657 /* else: after pcap_open_live() in capture_loop_open_input() */
3658 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3659 /* (Note: this means that the process, although logged in */
3660 /* as root, does not have various permissions such as the */
3661 /* ability to bypass file access permissions). */
3662 /* XXX: Should we just leave capabilities alone in this case */
3663 /* so that user gets expected effect that root can do */
3666 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3668 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3669 /* else: after pcap_open_live() in capture_loop_open_input() */
3670 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3671 /* pcap_open_live). */
3673 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3675 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3676 /* capabilities; Drop all other capabilities; */
3677 /* Drop suid privileges (euid=ruid); */
3678 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3679 /* else: after pcap_open_live() in capture_loop_open_input() */
3680 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3682 /* XXX: For some Linux versions/distros with capabilities */
3683 /* a 'normal' process with any capabilities cannot be */
3684 /* 'killed' (signaled) from another (same uid) non-privileged */
3686 /* For example: If (non-suid) Wireshark forks a */
3687 /* child suid dumpcap which acts as described here (case 5), */
3688 /* Wireshark will be unable to kill (signal) the child */
3689 /* dumpcap process until the capabilities have been dropped */
3690 /* (after pcap_open_live()). */
3691 /* This behaviour will apparently be changed in the kernel */
3692 /* to allow the kill (signal) in this case. */
3693 /* See the following for details: */
3694 /* http://www.mail-archive.com/ [wrapped] */
3695 /* linux-security-module@vger.kernel.org/msg02913.html */
3697 /* It is therefore conceivable that if dumpcap somehow hangs */
3698 /* in pcap_open_live or before that wireshark will not */
3699 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3700 /* In this case, exiting wireshark will kill the child */
3701 /* dumpcap process. */
3703 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3704 /* capabilities; Using libcap. Note: capset cmd (which see) */
3705 /* used to assign capabilities to file. */
3707 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3708 /* else: after pcap_open_live() in capture_loop_open_input() */
3709 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3711 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3712 /* longer required (similar to capture). */
3714 /* ----------------------------------------------------------------- */
3716 init_process_policies();
3719 /* If 'started with special privileges' (and using libcap) */
3720 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3721 /* Set euid/egid = ruid/rgid to remove suid privileges */
3722 relinquish_privs_except_capture();
3725 /* Set the initial values in the capture options. This might be overwritten
3726 by the command line parameters. */
3727 capture_opts_init(&global_capture_opts, NULL);
3729 /* Default to capturing the entire packet. */
3730 global_capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
3732 /* We always save to a file - if no file was specified, we save to a
3734 global_capture_opts.saving_to_file = TRUE;
3735 global_capture_opts.has_ring_num_files = TRUE;
3737 /* Now get our args */
3738 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3740 case 'h': /* Print help and exit */
3744 case 'v': /* Show version and exit */
3746 GString *comp_info_str;
3747 GString *runtime_info_str;
3748 /* Assemble the compile-time version information string */
3749 comp_info_str = g_string_new("Compiled ");
3750 get_compiled_version_info(comp_info_str, NULL, NULL);
3752 /* Assemble the run-time version information string */
3753 runtime_info_str = g_string_new("Running ");
3754 get_runtime_version_info(runtime_info_str, NULL);
3755 show_version(comp_info_str, runtime_info_str);
3756 g_string_free(comp_info_str, TRUE);
3757 g_string_free(runtime_info_str, TRUE);
3761 /*** capture option specific ***/
3762 case 'a': /* autostop criteria */
3763 case 'b': /* Ringbuffer option */
3764 case 'c': /* Capture x packets */
3765 case 'f': /* capture filter */
3766 case 'i': /* Use interface x */
3767 case 'n': /* Use pcapng format */
3768 case 'p': /* Don't capture in promiscuous mode */
3769 case 's': /* Set the snapshot (capture) length */
3770 case 'w': /* Write to capture file x */
3771 case 'g': /* enable group read accesson file(s) */
3772 case 'y': /* Set the pcap data link type */
3773 #ifdef HAVE_PCAP_REMOTE
3774 case 'u': /* Use UDP for data transfer */
3775 case 'r': /* Capture own RPCAP traffic too */
3776 case 'A': /* Authentication */
3778 #ifdef HAVE_PCAP_SETSAMPLING
3779 case 'm': /* Sampling */
3781 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3782 case 'B': /* Buffer size */
3783 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3784 #ifdef HAVE_PCAP_CREATE
3785 case 'I': /* Monitor mode */
3787 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
3792 /*** hidden option: Wireshark child mode (using binary output messages) ***/
3794 capture_child = TRUE;
3796 /* set output pipe to binary mode, to avoid ugly text conversions */
3797 _setmode(2, O_BINARY);
3799 * optarg = the control ID, aka the PPID, currently used for the
3802 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
3803 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
3804 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
3805 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
3807 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
3808 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3809 "Signal pipe: Unable to open %s. Dead parent?",
3817 case 'q': /* Quiet */
3821 /*** all non capture option specific ***/
3822 case 'D': /* Print a list of capture devices and exit */
3823 list_interfaces = TRUE;
3826 case 'L': /* Print list of link-layer types and exit */
3827 list_link_layer_types = TRUE;
3830 #ifdef HAVE_BPF_IMAGE
3831 case 'd': /* Print BPF code for capture filter and exit */
3832 print_bpf_code = TRUE;
3836 case 'S': /* Print interface statistics once a second */
3837 print_statistics = TRUE;
3840 case 'M': /* For -D, -L, and -S, print machine-readable output */
3841 machine_readable = TRUE;
3844 case '?': /* Bad flag - print usage message */
3845 cmdarg_err("Invalid Option: %s", argv[optind-1]);
3853 /* user specified file name as regular command-line argument */
3854 /* XXX - use it as the capture file name (or something else)? */
3861 * Extra command line arguments were specified; complain.
3862 * XXX - interpret as capture filter, as tcpdump and tshark do?
3864 cmdarg_err("Invalid argument: %s", argv[0]);
3873 if (run_once_args > 1) {
3874 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
3876 } else if (run_once_args == 1) {
3877 /* We're supposed to print some information, rather than
3878 to capture traffic; did they specify a ring buffer option? */
3879 if (global_capture_opts.multi_files_on) {
3880 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
3884 /* We're supposed to capture traffic; was the ring buffer option
3885 specified and, if so, does it make sense? */
3886 if (global_capture_opts.multi_files_on) {
3887 /* Ring buffer works only under certain conditions:
3888 a) ring buffer does not work with temporary files;
3889 b) it makes no sense to enable the ring buffer if the maximum
3890 file size is set to "infinite". */
3891 if (global_capture_opts.save_file == NULL) {
3892 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
3893 global_capture_opts.multi_files_on = FALSE;
3895 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
3896 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
3898 /* XXX - this must be redesigned as the conditions changed */
3899 global_capture_opts.multi_files_on = FALSE;
3906 * "-D" requires no interface to be selected; it's supposed to list
3909 if (list_interfaces) {
3910 /* Get the list of interfaces */
3915 if_list = capture_interface_list(&err, &err_str);
3916 if (if_list == NULL) {
3918 case CANT_GET_INTERFACE_LIST:
3919 cmdarg_err("%s", err_str);
3924 case NO_INTERFACES_FOUND:
3926 * If we're being run by another program, just give them
3927 * an empty list of interfaces, don't report this as
3928 * an error; that lets them decide whether to report
3929 * this as an error or not.
3931 if (!machine_readable) {
3932 cmdarg_err("There are no interfaces on which a capture can be done");
3939 if (machine_readable) /* tab-separated values to stdout */
3940 print_machine_readable_interfaces(if_list);
3942 capture_opts_print_interfaces(if_list);
3943 free_interface_list(if_list);
3948 * "-S" requires no interface to be selected; it gives statistics
3949 * for all interfaces.
3951 if (print_statistics) {
3952 status = print_statistics_loop(machine_readable);
3957 * "-L", "-d", and capturing act on a particular interface, so we have to
3958 * have an interface; if none was specified, pick a default.
3960 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
3961 /* cmdarg_err() already called .... */
3965 /* Let the user know what interfaces were chosen. */
3966 /* get_interface_descriptive_name() is not available! */
3967 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
3968 interface_options interface_opts;
3970 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
3971 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s", interface_opts.name);
3974 if (list_link_layer_types) {
3975 /* Get the list of link-layer types for the capture device. */
3976 if_capabilities_t *caps;
3980 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
3981 interface_options interface_opts;
3983 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
3984 caps = get_if_capabilities(interface_opts.name,
3985 interface_opts.monitor_mode, &err_str);
3987 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
3988 "Please check to make sure you have sufficient permissions, and that\n"
3989 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
3993 if (caps->data_link_types == NULL) {
3994 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
3997 if (machine_readable) /* tab-separated values to stdout */
3998 /* XXX: We need to change the format and adopt consumers */
3999 print_machine_readable_if_capabilities(caps);
4001 /* XXX: We might want to print also the interface name */
4002 capture_opts_print_if_capabilities(caps, interface_opts.name,
4003 interface_opts.monitor_mode);
4004 free_if_capabilities(caps);
4009 /* We're supposed to do a capture, or print the BPF code for a filter.
4010 Process the snapshot length, as that affects the generated BPF code. */
4011 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4013 #ifdef HAVE_BPF_IMAGE
4014 if (print_bpf_code) {
4015 show_filter_code(&global_capture_opts);
4020 /* We're supposed to do a capture. Process the ring buffer arguments. */
4021 capture_opts_trim_ring_num_files(&global_capture_opts);
4023 /* Now start the capture. */
4025 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4029 /* capture failed */
4032 return 0; /* never here, make compiler happy */
4037 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4038 const char *message, gpointer user_data _U_)
4045 /* ignore log message, if log_level isn't interesting */
4046 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4047 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4052 /* create a "timestamp" */
4054 today = localtime(&curr);
4056 switch(log_level & G_LOG_LEVEL_MASK) {
4057 case G_LOG_LEVEL_ERROR:
4060 case G_LOG_LEVEL_CRITICAL:
4063 case G_LOG_LEVEL_WARNING:
4066 case G_LOG_LEVEL_MESSAGE:
4069 case G_LOG_LEVEL_INFO:
4072 case G_LOG_LEVEL_DEBUG:
4076 fprintf(stderr, "unknown log_level %u\n", log_level);
4078 g_assert_not_reached();
4081 /* Generate the output message */
4082 if(log_level & G_LOG_LEVEL_MESSAGE) {
4083 /* normal user messages without additional infos */
4084 msg = g_strdup_printf("%s\n", message);
4086 /* info/debug messages with additional infos */
4087 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4088 today->tm_hour, today->tm_min, today->tm_sec,
4089 log_domain != NULL ? log_domain : "",
4093 /* DEBUG & INFO msgs (if we're debugging today) */
4094 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4095 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4096 #ifdef DEBUG_DUMPCAP
4097 fprintf(stderr, "%s", msg);
4100 #ifdef DEBUG_CHILD_DUMPCAP
4101 fprintf(debug_log, "%s", msg);
4109 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4110 /* to parent especially formatted if dumpcap running as child. */
4111 if (capture_child) {
4112 sync_pipe_errmsg_to_parent(2, msg, "");
4114 fprintf(stderr, "%s", msg);
4121 /****************************************************************************************************************/
4122 /* indication report routines */
4126 report_packet_count(int packet_count)
4128 char tmp[SP_DECISIZE+1+1];
4129 static int count = 0;
4132 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4133 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4134 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4136 count += packet_count;
4137 fprintf(stderr, "\rPackets: %u ", count);
4138 /* stderr could be line buffered */
4144 report_new_capture_file(const char *filename)
4147 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4148 pipe_write_block(2, SP_FILE, filename);
4152 * Prevent a SIGINFO handler from writing to the standard error
4153 * while we're doing so; instead, have it just set a flag telling
4154 * us to print that information when we're done.
4157 #endif /* SIGINFO */
4158 fprintf(stderr, "File: %s\n", filename);
4159 /* stderr could be line buffered */
4164 * Allow SIGINFO handlers to write.
4169 * If a SIGINFO handler asked us to write out capture counts, do so.
4172 report_counts_for_siginfo();
4173 #endif /* SIGINFO */
4178 report_cfilter_error(const char *cfilter, const char *errmsg)
4180 if (capture_child) {
4181 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4182 pipe_write_block(2, SP_BAD_FILTER, errmsg);
4185 "Invalid capture filter: \"%s\"!\n"
4187 "That string isn't a valid capture filter (%s).\n"
4188 "See the User's Guide for a description of the capture filter syntax.\n",
4194 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4197 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4198 "Primary Error: %s", error_msg);
4199 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4200 "Secondary Error: %s", secondary_error_msg);
4201 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4203 fprintf(stderr, "%s\n", error_msg);
4204 if (secondary_error_msg[0] != '\0')
4205 fprintf(stderr, "%s\n", secondary_error_msg);
4210 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4212 char tmp1[SP_DECISIZE+1+1];
4213 char tmp2[SP_DECISIZE+1+1];
4215 g_snprintf(tmp1, sizeof(tmp1), "%u", received);
4216 g_snprintf(tmp2, sizeof(tmp2), "%u", drops);
4219 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets captured/dropped on interface %s: %s/%s", name, tmp1, tmp2);
4220 /* XXX: Need to provide interface id, changes to consumers required. */
4221 pipe_write_block(2, SP_DROPS, tmp2);
4223 fprintf(stderr, "Packets captured/dropped on interface %s: %s/%s\n", name, tmp1, tmp2);
4224 /* stderr could be line buffered */
4230 /****************************************************************************************************************/
4231 /* signal_pipe handling */
4236 signal_pipe_check_running(void)
4238 /* any news from our parent? -> just stop the capture */
4242 /* if we are running standalone, no check required */
4243 if(!capture_child) {
4247 if(!sig_pipe_name || !sig_pipe_handle) {
4248 /* This shouldn't happen */
4249 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4250 "Signal pipe: No name or handle");
4255 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4256 * at this point. Should we check to see if the parent is still alive,
4257 * e.g. by using OpenProcess?
4260 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4262 if(!result || avail > 0) {
4263 /* peek failed or some bytes really available */
4264 /* (if not piping from stdin this would fail) */
4265 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4266 "Signal pipe: Stop capture: %s", sig_pipe_name);
4267 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4268 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4269 sig_pipe_handle, result, avail);
4272 /* pipe ok and no bytes available */
4279 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4284 * indent-tabs-mode: nil
4287 * vi: set shiftwidth=4 tabstop=8 expandtab
4288 * :indentSize=4:tabSize=8:noTabs=true: