5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
65 #include "wsutil/wsgetopt.h"
73 # include <sys/prctl.h>
74 # include <sys/capability.h>
77 #include "ringbuffer.h"
78 #include "clopts_common.h"
79 #include "console_io.h"
80 #include "cmdarg_err.h"
81 #include "version_info.h"
83 #include "capture-pcap-util.h"
89 #include "capture-wpcap.h"
90 #include <wsutil/unicode-utils.h>
94 #include <sys/socket.h>
98 #ifdef NEED_INET_V6DEFS_H
99 # include "wsutil/inet_v6defs.h"
102 #include <wsutil/privileges.h>
104 #include "sync_pipe.h"
106 #include "capture_opts.h"
107 #include "capture_ifinfo.h"
108 #include "capture_sync.h"
110 #include "conditions.h"
111 #include "capture_stop_conditions.h"
113 #include "tempfile.h"
115 #include "wsutil/file_util.h"
118 * Get information about libpcap format from "wiretap/libpcap.h".
119 * XXX - can we just use pcap_open_offline() to read the pipe?
121 #include "wiretap/libpcap.h"
123 /**#define DEBUG_DUMPCAP**/
124 /**#define DEBUG_CHILD_DUMPCAP**/
128 #include <conio.h> /* _getch() */
132 #ifdef DEBUG_CHILD_DUMPCAP
133 FILE *debug_log; /* for logging debug messages to */
134 /* a file if DEBUG_CHILD_DUMPCAP */
142 static GAsyncQueue *pcap_queue;
144 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
146 static gchar *sig_pipe_name = NULL;
147 static HANDLE sig_pipe_handle = NULL;
148 static gboolean signal_pipe_check_running(void);
152 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
153 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
156 /** Stop a low-level capture (stops the capture child). */
157 static void capture_loop_stop(void);
159 #if !defined (__linux__)
160 #ifndef HAVE_PCAP_BREAKLOOP
162 * We don't have pcap_breakloop(), which is the only way to ensure that
163 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
164 * won't, if the call to read the next packet or batch of packets is
165 * is interrupted by a signal on UN*X, just go back and try again to
168 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
169 * the signal handler, set a flag to stop capturing; however, without
170 * a guarantee of that sort, we can't guarantee that we'll stop capturing
171 * if the read will be retried and won't time out if no packets arrive.
173 * Therefore, on at least some platforms, we work around the lack of
174 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
175 * to wait for packets to arrive, so that we're probably going to be
176 * blocked in the select() when the signal arrives, and can just bail
177 * out of the loop at that point.
179 * However, we don't want to do that on BSD (because "select()" doesn't work
180 * correctly on BPF devices on at least some releases of some flavors of
181 * BSD), and we don't want to do it on Windows (because "select()" is
182 * something for sockets, not for arbitrary handles). (Note that "Windows"
183 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
184 * using WinPcap, not a UNIX libpcap.)
186 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
187 * on BSD times out even if no packets have arrived, so we'll eventually
188 * exit pcap_dispatch() with an indication that no packets have arrived,
189 * and will break out of the capture loop at that point.
191 * On Windows, we can't send a SIGINT to stop capturing, so none of this
192 * applies in any case.
194 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
195 * want to include it if it's not present on this platform, however.
197 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
198 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
200 # define MUST_DO_SELECT
201 # endif /* avoid select */
202 #endif /* HAVE_PCAP_BREAKLOOP */
204 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
205 * in pcap_dispatch(); on the other hand, select() works just fine there.
206 * Hence we use a select for that come what may.
208 #define MUST_DO_SELECT
211 /** init the capture filter */
214 INITFILTER_BAD_FILTER,
215 INITFILTER_OTHER_ERROR
216 } initfilter_status_t;
218 typedef struct _pcap_queue_element {
220 struct pcap_pkthdr phdr;
222 } pcap_queue_element;
224 typedef struct _pcap_options {
226 #ifdef MUST_DO_SELECT
227 int pcap_fd; /* pcap file descriptor */
234 /* capture pipe (unix only "input file") */
235 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
236 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
237 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
239 HANDLE cap_pipe_h; /* The handle of the capture pipe */
241 int cap_pipe_fd; /* the file descriptor of the capture pipe */
243 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
244 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
246 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
247 #endif /* USE_THREADS */
248 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
249 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
251 STATE_EXPECT_REC_HDR,
256 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
258 GMutex *cap_pipe_read_mtx;
259 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
263 typedef struct _loop_data {
265 gboolean go; /* TRUE as long as we're supposed to keep capturing */
266 int err; /* if non-zero, error seen while capturing */
267 gint packet_count; /* Number of packets we have already captured */
268 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
269 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
271 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
278 guint32 autostop_files;
282 * Standard secondary message for unexpected errors.
284 static const char please_report[] =
285 "Please report this to the Wireshark developers.\n"
286 "(This is not a crash; please do not report it as such.)";
289 * This needs to be static, so that the SIGINT handler can clear the "go"
292 static loop_data global_ld;
296 * Timeout, in milliseconds, for reads from the stream of captured packets
297 * from a capture device.
299 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
300 * 64-bit applications, with sub-second timeouts not to work. The bug is
301 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
303 #if defined(__APPLE__) && defined(__LP64__)
304 static gboolean need_timeout_workaround;
306 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
308 #define CAP_READ_TIMEOUT 250
312 * Timeout, in microseconds, for reads from the stream of captured packets
313 * from a pipe. Pipes don't have the same problem that BPF devices do
314 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
315 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
316 * of the offending versions of Snow Leopard.
318 * On Windows this value is converted to milliseconds and passed to
319 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
320 * will return immediately.
323 #define PIPE_READ_TIMEOUT 250000
325 #define PIPE_READ_TIMEOUT 100000
327 static const char *cap_pipe_err_str;
329 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
332 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
333 const char *message, gpointer user_data _U_);
335 /* capture related options */
336 static capture_options global_capture_opts;
337 static gboolean quiet = FALSE;
338 static gboolean use_threads = FALSE;
340 static void capture_loop_write_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
342 static void capture_loop_queue_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
344 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
345 int err, gboolean is_close);
347 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
349 static void report_new_capture_file(const char *filename);
350 static void report_packet_count(int packet_count);
351 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
352 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
353 static void report_cfilter_error(const char *cfilter, const char *errmsg);
355 #define MSG_MAX_LENGTH 4096
358 print_usage(gboolean print_ver)
365 "Dumpcap " VERSION "%s\n"
366 "Capture network packets and dump them into a libpcap file.\n"
367 "See http://www.wireshark.org for more information.\n",
368 wireshark_svnversion);
372 fprintf(output, "\nUsage: dumpcap [options] ...\n");
373 fprintf(output, "\n");
374 fprintf(output, "Capture interface:\n");
375 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
376 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
377 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
378 fprintf(output, " -p don't capture in promiscuous mode\n");
379 #ifdef HAVE_PCAP_CREATE
380 fprintf(output, " -I capture in monitor mode, if available\n");
382 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
383 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
385 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
386 fprintf(output, " -D print list of interfaces and exit\n");
387 fprintf(output, " -L print list of link-layer types of iface and exit\n");
388 #ifdef HAVE_BPF_IMAGE
389 fprintf(output, " -d print generated BPF code for capture filter\n");
391 fprintf(output, " -S print statistics for each interface once every second\n");
392 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
393 fprintf(output, "\n");
394 #ifdef HAVE_PCAP_REMOTE
395 fprintf(output, "\nRPCAP options:\n");
396 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
397 fprintf(output, " -u use UDP for RPCAP data transfer\n");
398 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
399 #ifdef HAVE_PCAP_SETSAMPLING
400 fprintf(output, " -m <sampling type> use packet sampling\n");
401 fprintf(output, " count:NUM - capture one packet of every NUM\n");
402 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
405 fprintf(output, "Stop conditions:\n");
406 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
407 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
408 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
409 fprintf(output, " files:NUM - stop after NUM files\n");
410 /*fprintf(output, "\n");*/
411 fprintf(output, "Output (files):\n");
412 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
413 fprintf(output, " -g enable group read access on the output file(s)\n");
414 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
415 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
416 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
417 fprintf(output, " -n use pcapng format instead of pcap\n");
418 /*fprintf(output, "\n");*/
419 fprintf(output, "Miscellaneous:\n");
420 fprintf(output, " -t use a separate thread per interface\n");
421 fprintf(output, " -q don't report packet capture counts\n");
422 fprintf(output, " -v print version information and exit\n");
423 fprintf(output, " -h display this help and exit\n");
424 fprintf(output, "\n");
425 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
426 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
427 fprintf(output, "\n");
428 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
432 show_version(GString *comp_info_str, GString *runtime_info_str)
435 "Dumpcap " VERSION "%s\n"
440 "See http://www.wireshark.org for more information.\n",
441 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
445 * Print to the standard error. This is a command-line tool, so there's
446 * no need to pop up a console.
449 vfprintf_stderr(const char *fmt, va_list ap)
451 vfprintf(stderr, fmt, ap);
455 fprintf_stderr(const char *fmt, ...)
460 vfprintf_stderr(fmt, ap);
465 * Report an error in command-line arguments.
468 cmdarg_err(const char *fmt, ...)
474 /* Generate a 'special format' message back to parent */
476 msg = g_strdup_vprintf(fmt, ap);
477 sync_pipe_errmsg_to_parent(2, msg, "");
482 fprintf(stderr, "dumpcap: ");
483 vfprintf(stderr, fmt, ap);
484 fprintf(stderr, "\n");
490 * Report additional information for an error in command-line arguments.
493 cmdarg_err_cont(const char *fmt, ...)
500 msg = g_strdup_vprintf(fmt, ap);
501 sync_pipe_errmsg_to_parent(2, msg, "");
506 vfprintf(stderr, fmt, ap);
507 fprintf(stderr, "\n");
514 #if 0 /* Set to enable capability debugging */
515 /* see 'man cap_to_text()' for explanation of output */
516 /* '=' means 'all= ' ie: no capabilities */
517 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
519 print_caps(const char *pfx) {
520 cap_t caps = cap_get_proc();
521 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
522 "%s: EUID: %d Capabilities: %s", pfx,
523 geteuid(), cap_to_text(caps, NULL));
526 print_caps(const char *pfx _U_) {
531 relinquish_all_capabilities(void)
533 /* Drop any and all capabilities this process may have. */
534 /* Allowed whether or not process has any privileges. */
535 cap_t caps = cap_init(); /* all capabilities initialized to off */
536 print_caps("Pre-clear");
537 if (cap_set_proc(caps)) {
538 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
540 print_caps("Post-clear");
546 open_capture_device(interface_options *interface_opts,
547 char (*open_err_str)[PCAP_ERRBUF_SIZE])
550 #ifdef HAVE_PCAP_CREATE
553 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
554 struct pcap_rmtauth auth;
557 /* Open the network interface to capture from it.
558 Some versions of libpcap may put warnings into the error buffer
559 if they succeed; to tell if that's happened, we have to clear
560 the error buffer, and check if it's still a null string. */
561 (*open_err_str)[0] = '\0';
562 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
564 * If we're opening a remote device, use pcap_open(); that's currently
565 * the only open routine that supports remote devices.
567 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
568 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
569 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
570 auth.username = interface_opts->auth_username;
571 auth.password = interface_opts->auth_password;
573 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
575 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
576 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
577 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
578 CAP_READ_TIMEOUT, &auth, *open_err_str);
583 * If we're not opening a remote device, use pcap_create() and
584 * pcap_activate() if we have them, so that we can set the buffer
585 * size, otherwise use pcap_open_live().
587 #ifdef HAVE_PCAP_CREATE
588 pcap_h = pcap_create(interface_opts->name, *open_err_str);
589 if (pcap_h != NULL) {
590 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
591 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
592 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
594 if (interface_opts->buffer_size > 1) {
595 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
597 if (interface_opts->monitor_mode)
598 pcap_set_rfmon(pcap_h, 1);
599 err = pcap_activate(pcap_h);
601 /* Failed to activate, set to NULL */
602 if (err == PCAP_ERROR)
603 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
605 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
611 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
612 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
617 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
618 /* to remove any suid privileges. */
619 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
620 /* (euid/egid have already previously been set to ruid/rgid. */
621 /* (See comment in main() for details) */
623 relinquish_special_privs_perm();
625 relinquish_all_capabilities();
632 get_capture_device_open_failure_messages(const char *open_err_str,
638 char *errmsg, size_t errmsg_len,
639 char *secondary_errmsg,
640 size_t secondary_errmsg_len)
642 const char *libpcap_warn;
643 static const char ppamsg[] = "can't find PPA for ";
645 /* If we got a "can't find PPA for X" message, warn the user (who
646 is running dumcap on HP-UX) that they don't have a version of
647 libpcap that properly handles HP-UX (libpcap 0.6.x and later
648 versions, which properly handle HP-UX, say "can't find /dev/dlpi
649 PPA for X" rather than "can't find PPA for X"). */
650 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
653 "You are running (T)Wireshark with a version of the libpcap library\n"
654 "that doesn't handle HP-UX network devices well; this means that\n"
655 "(T)Wireshark may not be able to capture packets.\n"
657 "To fix this, you should install libpcap 0.6.2, or a later version\n"
658 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
659 "packaged binary form from the Software Porting And Archive Centre\n"
660 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
661 "at the URL lists a number of mirror sites.";
664 g_snprintf(errmsg, (gulong) errmsg_len,
665 "The capture session could not be initiated (%s).", open_err_str);
667 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
668 "Please check to make sure you have sufficient permissions, and that you have "
669 "the proper interface or pipe specified.%s", libpcap_warn);
671 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
673 "Please check that \"%s\" is the proper interface.\n"
676 "Help can be found at:\n"
678 " http://wiki.wireshark.org/WinPcap\n"
679 " http://wiki.wireshark.org/CaptureSetup\n",
684 /* Set the data link type on a pcap. */
686 set_pcap_linktype(pcap_t *pcap_h, int linktype,
687 #ifdef HAVE_PCAP_SET_DATALINK
692 char *errmsg, size_t errmsg_len,
693 char *secondary_errmsg, size_t secondary_errmsg_len)
695 char *set_linktype_err_str;
698 return TRUE; /* just use the default */
699 #ifdef HAVE_PCAP_SET_DATALINK
700 if (pcap_set_datalink(pcap_h, linktype) == 0)
701 return TRUE; /* no error */
702 set_linktype_err_str = pcap_geterr(pcap_h);
704 /* Let them set it to the type it is; reject any other request. */
705 if (get_pcap_linktype(pcap_h, name) == linktype)
706 return TRUE; /* no error */
707 set_linktype_err_str =
708 "That DLT isn't one of the DLTs supported by this device";
710 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
711 set_linktype_err_str);
713 * If the error isn't "XXX is not one of the DLTs supported by this device",
714 * tell the user to tell the Wireshark developers about it.
716 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
717 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
719 secondary_errmsg[0] = '\0';
724 compile_capture_filter(const char *iface, pcap_t *pcap_h,
725 struct bpf_program *fcode, char *cfilter)
727 bpf_u_int32 netnum, netmask;
728 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
730 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
732 * Well, we can't get the netmask for this interface; it's used
733 * only for filters that check for broadcast IP addresses, so
734 * we just punt and use 0. It might be nice to warn the user,
735 * but that's a pain in a GUI application, as it'd involve popping
736 * up a message box, and it's not clear how often this would make
737 * a difference (only filters that check for IP broadcast addresses
741 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
744 if (pcap_compile(pcap_h, fcode, cfilter, 1, netmask) < 0)
749 #ifdef HAVE_BPF_IMAGE
751 show_filter_code(capture_options *capture_opts)
753 interface_options interface_opts;
755 gchar open_err_str[PCAP_ERRBUF_SIZE];
756 char errmsg[MSG_MAX_LENGTH+1];
757 char secondary_errmsg[MSG_MAX_LENGTH+1];
758 struct bpf_program fcode;
759 struct bpf_insn *insn;
763 for (j = 0; j < capture_opts->ifaces->len; j++) {
764 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
765 pcap_h = open_capture_device(&interface_opts, &open_err_str);
766 if (pcap_h == NULL) {
767 /* Open failed; get messages */
768 get_capture_device_open_failure_messages(open_err_str,
770 errmsg, sizeof errmsg,
772 sizeof secondary_errmsg);
773 /* And report them */
774 report_capture_error(errmsg, secondary_errmsg);
778 /* Set the link-layer type. */
779 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
780 errmsg, sizeof errmsg,
781 secondary_errmsg, sizeof secondary_errmsg)) {
783 report_capture_error(errmsg, secondary_errmsg);
787 /* OK, try to compile the capture filter. */
788 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
789 interface_opts.cfilter)) {
791 report_cfilter_error(interface_opts.cfilter, errmsg);
796 /* Now print the filter code. */
797 insn = fcode.bf_insns;
799 for (i = 0; i < fcode.bf_len; insn++, i++)
800 printf("%s\n", bpf_image(insn, i));
803 /* Let our parent know we succeeded. */
804 pipe_write_block(2, SP_SUCCESS, NULL);
811 * capture_interface_list() is expected to do the right thing to get
812 * a list of interfaces.
814 * In most of the programs in the Wireshark suite, "the right thing"
815 * is to run dumpcap and ask it for the list, because dumpcap may
816 * be the only program in the suite with enough privileges to get
819 * In dumpcap itself, however, we obviously can't run dumpcap to
820 * ask for the list. Therefore, our capture_interface_list() should
821 * just call get_interface_list().
824 capture_interface_list(int *err, char **err_str)
826 return get_interface_list(err, err_str);
830 * Get the data-link type for a libpcap device.
831 * This works around AIX 5.x's non-standard and incompatible-with-the-
832 * rest-of-the-universe libpcap.
835 get_pcap_linktype(pcap_t *pch, const char *devname
843 const char *ifacename;
846 linktype = pcap_datalink(pch);
850 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
851 * rather than DLT_ values for link-layer types; the ifType values
852 * for LAN devices are:
859 * and the ifType value for a loopback device is 24.
861 * The AIX names for LAN devices begin with:
868 * and the AIX names for loopback devices begin with "lo".
870 * (The difference between "Ethernet" and "802.3" is presumably
871 * whether packets have an Ethernet header, with a packet type,
872 * or an 802.3 header, with a packet length, followed by an 802.2
873 * header and possibly a SNAP header.)
875 * If the device name matches "linktype" interpreted as an ifType
876 * value, rather than as a DLT_ value, we will assume this is AIX's
877 * non-standard, incompatible libpcap, rather than a standard libpcap,
878 * and will map the link-layer type to the standard DLT_ value for
879 * that link-layer type, as that's what the rest of Wireshark expects.
881 * (This means the capture files won't be readable by a tcpdump
882 * linked with AIX's non-standard libpcap, but so it goes. They
883 * *will* be readable by standard versions of tcpdump, Wireshark,
886 * XXX - if we conclude we're using AIX libpcap, should we also
887 * set a flag to cause us to assume the time stamps are in
888 * seconds-and-nanoseconds form, and to convert them to
889 * seconds-and-microseconds form before processing them and
894 * Find the last component of the device name, which is the
897 ifacename = strchr(devname, '/');
898 if (ifacename == NULL)
901 /* See if it matches any of the LAN device names. */
902 if (strncmp(ifacename, "en", 2) == 0) {
905 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
909 } else if (strncmp(ifacename, "et", 2) == 0) {
912 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
913 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
918 } else if (strncmp(ifacename, "tr", 2) == 0) {
921 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
922 * DLT_IEEE802, which is what's used for Token Ring.
926 } else if (strncmp(ifacename, "fi", 2) == 0) {
927 if (linktype == 15) {
929 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
933 } else if (strncmp(ifacename, "lo", 2) == 0) {
934 if (linktype == 24) {
936 * That's the RFC 1573 value for "software loopback" devices; map it
937 * to DLT_NULL, which is what's used for loopback devices on BSD.
947 static data_link_info_t *
948 create_data_link_info(int dlt)
950 data_link_info_t *data_link_info;
953 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
954 data_link_info->dlt = dlt;
955 text = pcap_datalink_val_to_name(dlt);
957 data_link_info->name = g_strdup(text);
959 data_link_info->name = g_strdup_printf("DLT %d", dlt);
960 text = pcap_datalink_val_to_description(dlt);
962 data_link_info->description = g_strdup(text);
964 data_link_info->description = NULL;
965 return data_link_info;
969 * Get the capabilities of a network device.
971 static if_capabilities_t *
972 get_if_capabilities(const char *devname, gboolean monitor_mode
973 #ifndef HAVE_PCAP_CREATE
978 if_capabilities_t *caps;
979 char errbuf[PCAP_ERRBUF_SIZE];
981 #ifdef HAVE_PCAP_CREATE
985 #ifdef HAVE_PCAP_LIST_DATALINKS
989 data_link_info_t *data_link_info;
992 * Allocate the interface capabilities structure.
994 caps = g_malloc(sizeof *caps);
996 #ifdef HAVE_PCAP_OPEN
997 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
998 caps->can_set_rfmon = FALSE;
1000 if (err_str != NULL)
1001 *err_str = g_strdup(errbuf);
1005 #elif defined(HAVE_PCAP_CREATE)
1006 pch = pcap_create(devname, errbuf);
1008 if (err_str != NULL)
1009 *err_str = g_strdup(errbuf);
1013 status = pcap_can_set_rfmon(pch);
1016 if (status == PCAP_ERROR)
1017 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1020 *err_str = g_strdup(pcap_statustostr(status));
1026 caps->can_set_rfmon = FALSE;
1027 else if (status == 1) {
1028 caps->can_set_rfmon = TRUE;
1030 pcap_set_rfmon(pch, 1);
1032 if (err_str != NULL) {
1033 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1041 status = pcap_activate(pch);
1043 /* Error. We ignore warnings (status > 0). */
1044 if (err_str != NULL) {
1045 if (status == PCAP_ERROR)
1046 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1049 *err_str = g_strdup(pcap_statustostr(status));
1056 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1057 caps->can_set_rfmon = FALSE;
1059 if (err_str != NULL)
1060 *err_str = g_strdup(errbuf);
1065 deflt = get_pcap_linktype(pch, devname);
1066 #ifdef HAVE_PCAP_LIST_DATALINKS
1067 nlt = pcap_list_datalinks(pch, &linktypes);
1068 if (nlt == 0 || linktypes == NULL) {
1070 if (err_str != NULL)
1071 *err_str = NULL; /* an empty list doesn't mean an error */
1074 caps->data_link_types = NULL;
1075 for (i = 0; i < nlt; i++) {
1076 data_link_info = create_data_link_info(linktypes[i]);
1079 * XXX - for 802.11, make the most detailed 802.11
1080 * version the default, rather than the one the
1081 * device has as the default?
1083 if (linktypes[i] == deflt)
1084 caps->data_link_types = g_list_prepend(caps->data_link_types,
1087 caps->data_link_types = g_list_append(caps->data_link_types,
1090 #ifdef HAVE_PCAP_FREE_DATALINKS
1091 pcap_free_datalinks(linktypes);
1094 * In Windows, there's no guarantee that if you have a library
1095 * built with one version of the MSVC++ run-time library, and
1096 * it returns a pointer to allocated data, you can free that
1097 * data from a program linked with another version of the
1098 * MSVC++ run-time library.
1100 * This is not an issue on UN*X.
1102 * See the mail threads starting at
1104 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1108 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1111 #define xx_free free /* hack so checkAPIs doesn't complain */
1114 #endif /* HAVE_PCAP_FREE_DATALINKS */
1115 #else /* HAVE_PCAP_LIST_DATALINKS */
1117 data_link_info = create_data_link_info(deflt);
1118 caps->data_link_types = g_list_append(caps->data_link_types,
1120 #endif /* HAVE_PCAP_LIST_DATALINKS */
1124 if (err_str != NULL)
1129 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1131 print_machine_readable_interfaces(GList *if_list)
1138 char addr_str[ADDRSTRLEN];
1140 if (capture_child) {
1141 /* Let our parent know we succeeded. */
1142 pipe_write_block(2, SP_SUCCESS, NULL);
1145 i = 1; /* Interface id number */
1146 for (if_entry = g_list_first(if_list); if_entry != NULL;
1147 if_entry = g_list_next(if_entry)) {
1148 if_info = (if_info_t *)if_entry->data;
1149 printf("%d. %s", i++, if_info->name);
1152 * Print the contents of the if_entry struct in a parseable format.
1153 * Each if_entry element is tab-separated. Addresses are comma-
1156 /* XXX - Make sure our description doesn't contain a tab */
1157 if (if_info->description != NULL)
1158 printf("\t%s\t", if_info->description);
1162 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1163 addr = g_slist_next(addr)) {
1164 if (addr != g_slist_nth(if_info->addrs, 0))
1167 if_addr = (if_addr_t *)addr->data;
1168 switch(if_addr->ifat_type) {
1170 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1172 printf("%s", addr_str);
1174 printf("<unknown IPv4>");
1178 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1179 addr_str, ADDRSTRLEN)) {
1180 printf("%s", addr_str);
1182 printf("<unknown IPv6>");
1186 printf("<type unknown %u>", if_addr->ifat_type);
1190 if (if_info->loopback)
1191 printf("\tloopback");
1193 printf("\tnetwork");
1200 * If you change the machine-readable output format of this function,
1201 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1204 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1207 data_link_info_t *data_link_info;
1208 const gchar *desc_str;
1210 if (capture_child) {
1211 /* Let our parent know we succeeded. */
1212 pipe_write_block(2, SP_SUCCESS, NULL);
1215 if (caps->can_set_rfmon)
1219 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1220 lt_entry = g_list_next(lt_entry)) {
1221 data_link_info = (data_link_info_t *)lt_entry->data;
1222 if (data_link_info->description != NULL)
1223 desc_str = data_link_info->description;
1225 desc_str = "(not supported)";
1226 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1236 /* Print the number of packets captured for each interface until we're killed. */
1238 print_statistics_loop(gboolean machine_readable)
1240 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1246 char errbuf[PCAP_ERRBUF_SIZE];
1247 struct pcap_stat ps;
1249 if_list = get_interface_list(&err, &err_str);
1250 if (if_list == NULL) {
1252 case CANT_GET_INTERFACE_LIST:
1253 cmdarg_err("%s", err_str);
1257 case NO_INTERFACES_FOUND:
1258 cmdarg_err("There are no interfaces on which a capture can be done");
1264 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1265 if_info = (if_info_t *)if_entry->data;
1266 #ifdef HAVE_PCAP_OPEN
1267 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1269 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1273 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1274 if_stat->name = g_strdup(if_info->name);
1276 stat_list = g_list_append(stat_list, if_stat);
1281 cmdarg_err("There are no interfaces on which a capture can be done");
1285 if (capture_child) {
1286 /* Let our parent know we succeeded. */
1287 pipe_write_block(2, SP_SUCCESS, NULL);
1290 if (!machine_readable) {
1291 printf("%-15s %10s %10s\n", "Interface", "Received",
1295 global_ld.go = TRUE;
1296 while (global_ld.go) {
1297 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1298 if_stat = (if_stat_t *)stat_entry->data;
1299 pcap_stats(if_stat->pch, &ps);
1301 if (!machine_readable) {
1302 printf("%-15s %10u %10u\n", if_stat->name,
1303 ps.ps_recv, ps.ps_drop);
1305 printf("%s\t%u\t%u\n", if_stat->name,
1306 ps.ps_recv, ps.ps_drop);
1317 /* XXX - Not reached. Should we look for 'q' in stdin? */
1318 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1319 if_stat = (if_stat_t *)stat_entry->data;
1320 pcap_close(if_stat->pch);
1321 g_free(if_stat->name);
1324 g_list_free(stat_list);
1325 free_interface_list(if_list);
1333 capture_cleanup_handler(DWORD dwCtrlType)
1335 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1336 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1337 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1338 like SIGTERM at least when the machine's shutting down.
1340 For now, if we're running as a command rather than a capture child,
1341 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1342 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1343 in that way on UN*X.
1345 If we're not running as a capture child, we might be running as
1346 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1347 user logs out. (XXX - can we explicitly check whether we're
1348 running as a service?) */
1350 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1351 "Console: Control signal");
1352 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1353 "Console: Control signal, CtrlType: %u", dwCtrlType);
1355 /* Keep capture running if we're a service and a user logs off */
1356 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1357 capture_loop_stop();
1365 capture_cleanup_handler(int signum _U_)
1367 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1368 SIGTERM. We assume that if the user wanted it to keep running
1369 after they logged out, they'd have nohupped it. */
1371 /* Note: don't call g_log() in the signal handler: if we happened to be in
1372 * g_log() in process context when the signal came in, g_log will detect
1373 * the "recursion" and abort.
1376 capture_loop_stop();
1382 report_capture_count(void)
1384 /* Don't print this if we're a capture child. */
1385 if (!capture_child) {
1387 /* Report the count only if we aren't printing a packet count
1388 as packets arrive. */
1389 fprintf(stderr, "Packets captured: %u\n", global_ld.packet_count);
1390 /* stderr could be line buffered */
1399 report_counts_for_siginfo(void)
1401 report_capture_count();
1402 infoprint = FALSE; /* we just reported it */
1406 report_counts_siginfo(int signum _U_)
1408 int sav_errno = errno;
1410 /* If we've been told to delay printing, just set a flag asking
1411 that we print counts (if we're supposed to), otherwise print
1412 the count of packets captured (if we're supposed to). */
1416 report_counts_for_siginfo();
1419 #endif /* SIGINFO */
1422 exit_main(int status)
1425 /* Shutdown windows sockets */
1428 /* can be helpful for debugging */
1429 #ifdef DEBUG_DUMPCAP
1430 printf("Press any key\n");
1441 * If we were linked with libcap (not libpcap), make sure we have
1442 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1443 * (See comment in main() for details)
1446 relinquish_privs_except_capture(void)
1448 /* If 'started_with_special_privs' (ie: suid) then enable for
1449 * ourself the NET_ADMIN and NET_RAW capabilities and then
1450 * drop our suid privileges.
1452 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1453 * stuff we don't need (and shouldn't have).
1454 * CAP_NET_RAW: Packet capture (raw sockets).
1457 if (started_with_special_privs()) {
1458 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1459 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1461 cap_t caps = cap_init(); /* all capabilities initialized to off */
1463 print_caps("Pre drop, pre set");
1465 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1466 cmdarg_err("prctl() fail return: %s", strerror(errno));
1469 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1470 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1472 if (cap_set_proc(caps)) {
1473 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1475 print_caps("Pre drop, post set");
1477 relinquish_special_privs_perm();
1479 print_caps("Post drop, pre set");
1480 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1481 if (cap_set_proc(caps)) {
1482 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1484 print_caps("Post drop, post set");
1490 #endif /* HAVE_LIBCAP */
1492 /* Take care of byte order in the libpcap headers read from pipes.
1493 * (function taken from wiretap/libpcap.c) */
1495 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1498 /* Byte-swap the record header fields. */
1499 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1500 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1501 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1502 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1505 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1506 swapped, in order to match the BPF header layout.
1508 Unfortunately, some files were, according to a comment in the "libpcap"
1509 source, written with version 2.3 in their headers but without the
1510 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1511 would make no sense - we assume that we need to swap them. */
1512 if (hdr->version_major == 2 &&
1513 (hdr->version_minor < 3 ||
1514 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1517 temp = rechdr->orig_len;
1518 rechdr->orig_len = rechdr->incl_len;
1519 rechdr->incl_len = temp;
1525 * Thread function that reads from a pipe and pushes the data
1526 * to the main application thread.
1529 * XXX Right now we use async queues for basic signaling. The main thread
1530 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1531 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1532 * Iff the read is successful cap_pipe_read pushes an item onto
1533 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1534 * the queues themselves (yet).
1536 * We might want to move some of the cap_pipe_dispatch logic here so that
1537 * we can let cap_pipe_read run independently, queuing up multiple reads
1538 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1540 static void *cap_pipe_read(void *arg)
1542 pcap_options *pcap_opts = (pcap_options *)arg;
1551 while (pcap_opts->cap_pipe_err == PIPOK) {
1552 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1553 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1555 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1557 /* If we try to use read() on a named pipe on Windows with partial
1558 * data it appears to return EOF.
1560 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1561 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1566 last_err = GetLastError();
1567 if (last_err == ERROR_MORE_DATA) {
1569 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1570 pcap_opts->cap_pipe_err = PIPEOF;
1574 pcap_opts->cap_pipe_err = PIPERR;
1577 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1578 pcap_opts->cap_pipe_err = PIPEOF;
1583 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1584 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1587 pcap_opts->cap_pipe_err = PIPEOF;
1591 pcap_opts->cap_pipe_err = PIPERR;
1600 pcap_opts->cap_pipe_bytes_read = bytes_read;
1601 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1602 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1604 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1608 #endif /* USE_THREADS */
1610 /* Provide select() functionality for a single file descriptor
1611 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1613 * Returns the same values as select. If an error is returned,
1614 * the string cap_pipe_err_str should be used instead of errno.
1617 cap_pipe_select(int pipe_fd)
1620 struct timeval timeout;
1623 cap_pipe_err_str = "Unknown error";
1626 FD_SET(pipe_fd, &rfds);
1628 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1629 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1631 sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1633 cap_pipe_err_str = strerror(errno);
1638 /* Mimic pcap_open_live() for pipe captures
1640 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1641 * open it, and read the header.
1643 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1644 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1646 cap_pipe_open_live(char *pipename,
1647 pcap_options *pcap_opts,
1648 struct pcap_hdr *hdr,
1649 char *errmsg, int errmsgl)
1652 ws_statb64 pipe_stat;
1653 struct sockaddr_un sa;
1664 unsigned int bytes_read;
1669 pcap_opts->cap_pipe_fd = -1;
1671 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1673 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1676 * XXX - this blocks until a pcap per-file header has been written to
1677 * the pipe, so it could block indefinitely.
1679 if (strcmp(pipename, "-") == 0) {
1681 fd = 0; /* read from stdin */
1683 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1687 if (ws_stat64(pipename, &pipe_stat) < 0) {
1688 if (errno == ENOENT || errno == ENOTDIR)
1689 pcap_opts->cap_pipe_err = PIPNEXIST;
1691 g_snprintf(errmsg, errmsgl,
1692 "The capture session could not be initiated "
1693 "due to error getting information on pipe/socket: %s", strerror(errno));
1694 pcap_opts->cap_pipe_err = PIPERR;
1698 if (S_ISFIFO(pipe_stat.st_mode)) {
1699 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1701 g_snprintf(errmsg, errmsgl,
1702 "The capture session could not be initiated "
1703 "due to error on pipe open: %s", strerror(errno));
1704 pcap_opts->cap_pipe_err = PIPERR;
1707 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1708 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1710 g_snprintf(errmsg, errmsgl,
1711 "The capture session could not be initiated "
1712 "due to error on socket create: %s", strerror(errno));
1713 pcap_opts->cap_pipe_err = PIPERR;
1716 sa.sun_family = AF_UNIX;
1718 * The Single UNIX Specification says:
1720 * The size of sun_path has intentionally been left undefined.
1721 * This is because different implementations use different sizes.
1722 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1723 * of 104. Since most implementations originate from BSD versions,
1724 * the size is typically in the range 92 to 108.
1726 * Applications should not assume a particular length for sun_path
1727 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1731 * The <sys/un.h> header shall define the sockaddr_un structure,
1732 * which shall include at least the following members:
1734 * sa_family_t sun_family Address family.
1735 * char sun_path[] Socket pathname.
1737 * so we assume that it's an array, with a specified size,
1738 * and that the size reflects the maximum path length.
1740 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1741 /* Path name too long */
1742 g_snprintf(errmsg, errmsgl,
1743 "The capture session coud not be initiated "
1744 "due to error on socket connect: Path name too long");
1745 pcap_opts->cap_pipe_err = PIPERR;
1748 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1750 g_snprintf(errmsg, errmsgl,
1751 "The capture session coud not be initiated "
1752 "due to error on socket connect: %s", strerror(errno));
1753 pcap_opts->cap_pipe_err = PIPERR;
1757 if (S_ISCHR(pipe_stat.st_mode)) {
1759 * Assume the user specified an interface on a system where
1760 * interfaces are in /dev. Pretend we haven't seen it.
1762 pcap_opts->cap_pipe_err = PIPNEXIST;
1765 g_snprintf(errmsg, errmsgl,
1766 "The capture session could not be initiated because\n"
1767 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1768 pcap_opts->cap_pipe_err = PIPERR;
1773 #define PIPE_STR "\\pipe\\"
1774 /* Under Windows, named pipes _must_ have the form
1775 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1777 pncopy = g_strdup(pipename);
1778 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1779 pos = strchr(pncopy + 3, '\\');
1780 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1787 g_snprintf(errmsg, errmsgl,
1788 "The capture session could not be initiated because\n"
1789 "\"%s\" is neither an interface nor a pipe", pipename);
1790 pcap_opts->cap_pipe_err = PIPNEXIST;
1794 /* Wait for the pipe to appear */
1796 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1797 OPEN_EXISTING, 0, NULL);
1799 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1802 if (GetLastError() != ERROR_PIPE_BUSY) {
1803 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1804 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1805 g_snprintf(errmsg, errmsgl,
1806 "The capture session on \"%s\" could not be started "
1807 "due to error on pipe open: %s (error %d)",
1808 pipename, utf_16to8(err_str), GetLastError());
1810 pcap_opts->cap_pipe_err = PIPERR;
1814 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1815 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1816 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1817 g_snprintf(errmsg, errmsgl,
1818 "The capture session on \"%s\" timed out during "
1819 "pipe open: %s (error %d)",
1820 pipename, utf_16to8(err_str), GetLastError());
1822 pcap_opts->cap_pipe_err = PIPERR;
1829 pcap_opts->from_cap_pipe = TRUE;
1832 /* read the pcap header */
1834 while (bytes_read < sizeof magic) {
1835 sel_ret = cap_pipe_select(fd);
1837 g_snprintf(errmsg, errmsgl,
1838 "Unexpected error from select: %s", strerror(errno));
1840 } else if (sel_ret > 0) {
1841 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1844 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1846 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1853 #else /* USE_THREADS */
1854 g_thread_create(&cap_pipe_read, &pcap_opts, FALSE, NULL);
1856 pcap_opts->cap_pipe_buf = (char *) &magic;
1857 pcap_opts->cap_pipe_bytes_read = 0;
1858 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1859 /* We don't have to worry about cap_pipe_read_mtx here */
1860 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1861 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1862 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1863 if (pcap_opts->cap_pipe_bytes_read == 0)
1864 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1866 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1871 #endif /* USE_THREADS */
1875 /* Host that wrote it has our byte order, and was running
1876 a program using either standard or ss990417 libpcap. */
1877 pcap_opts->cap_pipe_byte_swapped = FALSE;
1878 pcap_opts->cap_pipe_modified = FALSE;
1880 case PCAP_MODIFIED_MAGIC:
1881 /* Host that wrote it has our byte order, but was running
1882 a program using either ss990915 or ss991029 libpcap. */
1883 pcap_opts->cap_pipe_byte_swapped = FALSE;
1884 pcap_opts->cap_pipe_modified = TRUE;
1886 case PCAP_SWAPPED_MAGIC:
1887 /* Host that wrote it has a byte order opposite to ours,
1888 and was running a program using either standard or
1889 ss990417 libpcap. */
1890 pcap_opts->cap_pipe_byte_swapped = TRUE;
1891 pcap_opts->cap_pipe_modified = FALSE;
1893 case PCAP_SWAPPED_MODIFIED_MAGIC:
1894 /* Host that wrote it out has a byte order opposite to
1895 ours, and was running a program using either ss990915
1896 or ss991029 libpcap. */
1897 pcap_opts->cap_pipe_byte_swapped = TRUE;
1898 pcap_opts->cap_pipe_modified = TRUE;
1901 /* Not a "libpcap" type we know about. */
1902 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1907 /* Read the rest of the header */
1909 while (bytes_read < sizeof(struct pcap_hdr)) {
1910 sel_ret = cap_pipe_select(fd);
1912 g_snprintf(errmsg, errmsgl,
1913 "Unexpected error from select: %s", strerror(errno));
1915 } else if (sel_ret > 0) {
1916 b = read(fd, ((char *)hdr)+bytes_read,
1917 sizeof(struct pcap_hdr) - bytes_read);
1920 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1922 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1929 #else /* USE_THREADS */
1930 pcap_opts->cap_pipe_buf = (char *) hdr;
1931 pcap_opts->cap_pipe_bytes_read = 0;
1932 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1933 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1934 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1935 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1936 if (pcap_opts->cap_pipe_bytes_read == 0)
1937 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1939 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1943 #endif /* USE_THREADS */
1945 if (pcap_opts->cap_pipe_byte_swapped) {
1946 /* Byte-swap the header fields about which we care. */
1947 hdr->version_major = BSWAP16(hdr->version_major);
1948 hdr->version_minor = BSWAP16(hdr->version_minor);
1949 hdr->snaplen = BSWAP32(hdr->snaplen);
1950 hdr->network = BSWAP32(hdr->network);
1952 pcap_opts->linktype = hdr->network;
1954 if (hdr->version_major < 2) {
1955 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1959 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1960 pcap_opts->cap_pipe_err = PIPOK;
1962 pcap_opts->cap_pipe_fd = fd;
1967 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1968 pcap_opts->cap_pipe_err = PIPERR;
1971 pcap_opts->cap_pipe_fd = -1;
1978 /* We read one record from the pipe, take care of byte order in the record
1979 * header, write the record to the capture file, and update capture statistics. */
1981 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
1983 struct pcap_pkthdr phdr;
1984 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1996 #ifdef LOG_CAPTURE_VERBOSE
1997 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2000 switch (pcap_opts->cap_pipe_state) {
2002 case STATE_EXPECT_REC_HDR:
2004 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2007 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2008 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2009 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2010 pcap_opts->cap_pipe_bytes_read = 0;
2013 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2014 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2015 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2020 case STATE_READ_REC_HDR:
2022 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2023 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2026 result = PD_PIPE_EOF;
2028 result = PD_PIPE_ERR;
2031 pcap_opts->cap_pipe_bytes_read += b;
2032 #else /* USE_THREADS */
2033 g_get_current_time(&wait_time);
2034 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2035 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2036 if (pcap_opts->cap_pipe_err == PIPEOF) {
2037 result = PD_PIPE_EOF;
2039 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2040 result = PD_PIPE_ERR;
2046 #endif /* USE_THREADS */
2047 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2049 result = PD_REC_HDR_READ;
2052 case STATE_EXPECT_DATA:
2054 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2057 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2058 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2059 pcap_opts->cap_pipe_bytes_read = 0;
2062 pcap_opts->cap_pipe_buf = (char *) data;
2063 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2064 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2069 case STATE_READ_DATA:
2071 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2072 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2075 result = PD_PIPE_EOF;
2077 result = PD_PIPE_ERR;
2080 pcap_opts->cap_pipe_bytes_read += b;
2081 #else /* USE_THREADS */
2082 g_get_current_time(&wait_time);
2083 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2084 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2085 if (pcap_opts->cap_pipe_err == PIPEOF) {
2086 result = PD_PIPE_EOF;
2088 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2089 result = PD_PIPE_ERR;
2095 #endif /* USE_THREADS */
2096 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2098 result = PD_DATA_READ;
2102 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2105 } /* switch (ld->cap_pipe_state) */
2108 * We've now read as much data as we were expecting, so process it.
2112 case PD_REC_HDR_READ:
2113 /* We've read the header. Take care of byte order. */
2114 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2115 &pcap_opts->cap_pipe_rechdr.hdr);
2116 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2117 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2118 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2121 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2125 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2126 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2127 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2128 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2129 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2132 capture_loop_queue_packet_cb((u_char *)&pcap_opts->interface_id, &phdr, data);
2134 capture_loop_write_packet_cb((u_char *)&pcap_opts->interface_id, &phdr, data);
2136 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2140 pcap_opts->cap_pipe_err = PIPEOF;
2145 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2146 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2147 g_snprintf(errmsg, errmsgl,
2148 "Error reading from pipe: %s (error %d)",
2149 utf_16to8(err_str), GetLastError());
2152 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2160 pcap_opts->cap_pipe_err = PIPERR;
2161 /* Return here rather than inside the switch to prevent GCC warning */
2166 /** Open the capture input file (pcap or capture pipe).
2167 * Returns TRUE if it succeeds, FALSE otherwise. */
2169 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2170 char *errmsg, size_t errmsg_len,
2171 char *secondary_errmsg, size_t secondary_errmsg_len)
2173 gchar open_err_str[PCAP_ERRBUF_SIZE];
2174 gchar *sync_msg_str;
2175 interface_options interface_opts;
2176 pcap_options pcap_opts;
2180 gchar *sync_secondary_msg_str;
2181 WORD wVersionRequested;
2185 /* XXX - opening Winsock on tshark? */
2187 /* Initialize Windows Socket if we are in a WIN32 OS
2188 This needs to be done before querying the interface for network/netmask */
2190 /* XXX - do we really require 1.1 or earlier?
2191 Are there any versions that support only 2.0 or higher? */
2192 wVersionRequested = MAKEWORD(1, 1);
2193 err = WSAStartup(wVersionRequested, &wsaData);
2197 case WSASYSNOTREADY:
2198 g_snprintf(errmsg, (gulong) errmsg_len,
2199 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2202 case WSAVERNOTSUPPORTED:
2203 g_snprintf(errmsg, (gulong) errmsg_len,
2204 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2205 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2208 case WSAEINPROGRESS:
2209 g_snprintf(errmsg, (gulong) errmsg_len,
2210 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2214 g_snprintf(errmsg, (gulong) errmsg_len,
2215 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2219 g_snprintf(errmsg, (gulong) errmsg_len,
2220 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2224 g_snprintf(errmsg, (gulong) errmsg_len,
2225 "Couldn't initialize Windows Sockets: error %d", err);
2228 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2232 if ((use_threads == FALSE) &&
2233 (capture_opts->ifaces->len > 1)) {
2234 g_snprintf(errmsg, (gulong) errmsg_len,
2235 "Using threads is required for capturing on mulitple interfaces! Use the -t option.");
2239 for (i = 0; i < capture_opts->ifaces->len; i++) {
2240 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2241 pcap_opts.pcap_h = NULL;
2242 #ifdef MUST_DO_SELECT
2243 pcap_opts.pcap_fd = -1;
2245 pcap_opts.pcap_err = FALSE;
2246 pcap_opts.interface_id = i;
2247 pcap_opts.tid = NULL;
2248 pcap_opts.snaplen = 0;
2249 pcap_opts.linktype = -1;
2250 pcap_opts.from_cap_pipe = FALSE;
2251 memset(&pcap_opts.cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2252 memset(&pcap_opts.cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2254 pcap_opts.cap_pipe_h = INVALID_HANDLE_VALUE;
2256 pcap_opts.cap_pipe_fd = -1;
2258 pcap_opts.cap_pipe_modified = FALSE;
2259 pcap_opts.cap_pipe_byte_swapped = FALSE;
2261 pcap_opts.cap_pipe_buf = NULL;
2262 #endif /* USE_THREADS */
2263 pcap_opts.cap_pipe_bytes_to_read = 0;
2264 pcap_opts.cap_pipe_bytes_read = 0;
2265 pcap_opts.cap_pipe_state = 0;
2266 pcap_opts.cap_pipe_err = PIPOK;
2268 pcap_opts.cap_pipe_read_mtx = g_mutex_new();
2269 pcap_opts.cap_pipe_pending_q = g_async_queue_new();
2270 pcap_opts.cap_pipe_done_q = g_async_queue_new();
2273 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2274 pcap_opts.pcap_h = open_capture_device(&interface_opts, &open_err_str);
2276 if (pcap_opts.pcap_h != NULL) {
2277 /* we've opened "iface" as a network device */
2279 /* try to set the capture buffer size */
2280 if (interface_opts.buffer_size > 1 &&
2281 pcap_setbuff(pcap_opts.pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2282 sync_secondary_msg_str = g_strdup_printf(
2283 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2284 "the default of 1MB will be used.\n"
2286 "Nonetheless, the capture is started.\n",
2287 interface_opts.buffer_size);
2288 report_capture_error("Couldn't set the capture buffer size!",
2289 sync_secondary_msg_str);
2290 g_free(sync_secondary_msg_str);
2294 #if defined(HAVE_PCAP_SETSAMPLING)
2295 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2296 struct pcap_samp *samp;
2298 if ((samp = pcap_setsampling(pcap_opts.pcap_h)) != NULL) {
2299 switch (interface_opts.sampling_method) {
2300 case CAPTURE_SAMP_BY_COUNT:
2301 samp->method = PCAP_SAMP_1_EVERY_N;
2304 case CAPTURE_SAMP_BY_TIMER:
2305 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2309 sync_msg_str = g_strdup_printf(
2310 "Unknown sampling method %d specified,\n"
2311 "continue without packet sampling",
2312 interface_opts.sampling_method);
2313 report_capture_error("Couldn't set the capture "
2314 "sampling", sync_msg_str);
2315 g_free(sync_msg_str);
2317 samp->value = interface_opts.sampling_param;
2319 report_capture_error("Couldn't set the capture sampling",
2320 "Cannot get packet sampling data structure");
2326 /* setting the data link type only works on real interfaces */
2327 if (!set_pcap_linktype(pcap_opts.pcap_h, interface_opts.linktype, interface_opts.name,
2329 secondary_errmsg, secondary_errmsg_len)) {
2330 g_array_append_val(ld->pcaps, pcap_opts);
2333 pcap_opts.linktype = get_pcap_linktype(pcap_opts.pcap_h, interface_opts.name);
2335 /* We couldn't open "iface" as a network device. */
2336 /* Try to open it as a pipe */
2337 cap_pipe_open_live(interface_opts.name, &pcap_opts, &pcap_opts.cap_pipe_hdr, errmsg, (int) errmsg_len);
2340 if (pcap_opts.cap_pipe_fd == -1) {
2342 if (pcap_opts.cap_pipe_h == INVALID_HANDLE_VALUE) {
2344 if (pcap_opts.cap_pipe_err == PIPNEXIST) {
2345 /* Pipe doesn't exist, so output message for interface */
2346 get_capture_device_open_failure_messages(open_err_str,
2347 interface_opts.name,
2351 secondary_errmsg_len);
2354 * Else pipe (or file) does exist and cap_pipe_open_live() has
2357 g_array_append_val(ld->pcaps, pcap_opts);
2360 /* cap_pipe_open_live() succeeded; don't want
2361 error message from pcap_open_live() */
2362 open_err_str[0] = '\0';
2366 /* XXX - will this work for tshark? */
2367 #ifdef MUST_DO_SELECT
2368 if (!pcap_opts.from_cap_pipe) {
2369 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2370 pcap_opts.pcap_fd = pcap_get_selectable_fd(pcap_opts.pcap_h);
2372 pcap_opts.pcap_fd = pcap_fileno(pcap_opts.pcap_h);
2377 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2378 returned a warning; print it, but keep capturing. */
2379 if (open_err_str[0] != '\0') {
2380 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2381 report_capture_error(sync_msg_str, "");
2382 g_free(sync_msg_str);
2384 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2385 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2386 g_array_append_val(ld->pcaps, pcap_opts);
2392 /* close the capture input file (pcap or capture pipe) */
2393 static void capture_loop_close_input(loop_data *ld)
2396 pcap_options pcap_opts;
2398 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2400 for (i = 0; i < ld->pcaps->len; i++) {
2401 pcap_opts = g_array_index(ld->pcaps, pcap_options, i);
2402 /* if open, close the capture pipe "input file" */
2404 if (pcap_opts.cap_pipe_fd >= 0) {
2405 g_assert(pcap_opts.from_cap_pipe);
2406 ws_close(pcap_opts.cap_pipe_fd);
2407 pcap_opts.cap_pipe_fd = -1;
2410 if (pcap_opts.cap_pipe_h != INVALID_HANDLE_VALUE) {
2411 CloseHandle(pcap_opts.cap_pipe_h);
2412 pcap_opts.cap_pipe_h = INVALID_HANDLE_VALUE;
2415 /* if open, close the pcap "input file" */
2416 if (pcap_opts.pcap_h != NULL) {
2417 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", pcap_opts.pcap_h);
2418 pcap_close(pcap_opts.pcap_h);
2419 pcap_opts.pcap_h = NULL;
2426 /* Shut down windows sockets */
2432 /* init the capture filter */
2433 static initfilter_status_t
2434 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2435 gchar * name, gchar * cfilter)
2437 struct bpf_program fcode;
2439 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2441 /* capture filters only work on real interfaces */
2442 if (cfilter && !from_cap_pipe) {
2443 /* A capture filter was specified; set it up. */
2444 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2445 /* Treat this specially - our caller might try to compile this
2446 as a display filter and, if that succeeds, warn the user that
2447 the display and capture filter syntaxes are different. */
2448 return INITFILTER_BAD_FILTER;
2450 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2451 #ifdef HAVE_PCAP_FREECODE
2452 pcap_freecode(&fcode);
2454 return INITFILTER_OTHER_ERROR;
2456 #ifdef HAVE_PCAP_FREECODE
2457 pcap_freecode(&fcode);
2461 return INITFILTER_NO_ERROR;
2465 /* set up to write to the already-opened capture output file/files */
2467 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2471 pcap_options pcap_opts;
2472 interface_options interface_opts;
2473 gboolean successful;
2475 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2477 if ((capture_opts->use_pcapng == FALSE) &&
2478 (capture_opts->ifaces->len > 1)) {
2479 g_snprintf(errmsg, errmsg_len,
2480 "Using PCAPNG is required for capturing on mulitple interfaces! Use the -n option.");
2484 /* Set up to write to the capture file. */
2485 if (capture_opts->multi_files_on) {
2486 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2488 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2491 if (capture_opts->use_pcapng) {
2494 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2495 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err);
2496 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2497 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2498 pcap_opts = g_array_index(ld->pcaps, pcap_options, i);
2499 if (pcap_opts.from_cap_pipe) {
2500 pcap_opts.snaplen = pcap_opts.cap_pipe_hdr.snaplen;
2502 pcap_opts.snaplen = pcap_snapshot(pcap_opts.pcap_h);
2504 successful = libpcap_write_interface_description_block(ld->pdh,
2505 interface_opts.name,
2506 interface_opts.cfilter,
2513 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2514 pcap_opts = g_array_index(ld->pcaps, pcap_options, 0);
2515 if (pcap_opts.from_cap_pipe) {
2516 pcap_opts.snaplen = pcap_opts.cap_pipe_hdr.snaplen;
2518 pcap_opts.snaplen = pcap_snapshot(pcap_opts.pcap_h);
2520 successful = libpcap_write_file_header(ld->pdh, pcap_opts.linktype, pcap_opts.snaplen,
2521 &ld->bytes_written, &err);
2529 if (ld->pdh == NULL) {
2530 /* We couldn't set up to write to the capture file. */
2531 /* XXX - use cf_open_error_message from tshark instead? */
2536 g_snprintf(errmsg, errmsg_len,
2537 "The file to which the capture would be"
2538 " saved (\"%s\") could not be opened: Error %d.",
2539 capture_opts->save_file, err);
2541 g_snprintf(errmsg, errmsg_len,
2542 "The file to which the capture would be"
2543 " saved (\"%s\") could not be opened: %s.",
2544 capture_opts->save_file, strerror(err));
2556 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2560 pcap_options pcap_opts;
2562 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2564 if (capture_opts->multi_files_on) {
2565 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2567 if (capture_opts->use_pcapng) {
2568 for (i = 0; i < global_ld.pcaps->len; i++) {
2569 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2570 if (!pcap_opts.from_cap_pipe) {
2571 libpcap_write_interface_statistics_block(ld->pdh, i, pcap_opts.pcap_h, &ld->bytes_written, err_close);
2575 return libpcap_dump_close(ld->pdh, err_close);
2579 /* dispatch incoming packets (pcap or capture pipe)
2581 * Waits for incoming packets to be available, and calls pcap_dispatch()
2582 * to cause them to be processed.
2584 * Returns the number of packets which were processed.
2586 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2587 * packet-batching behaviour does not cause packets to get held back
2591 capture_loop_dispatch(loop_data *ld,
2592 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2595 gint packet_count_before;
2596 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2601 packet_count_before = ld->packet_count;
2602 if (pcap_opts->from_cap_pipe) {
2603 /* dispatch from capture pipe */
2604 #ifdef LOG_CAPTURE_VERBOSE
2605 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2608 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2610 if (sel_ret < 0 && errno != EINTR) {
2611 g_snprintf(errmsg, errmsg_len,
2612 "Unexpected error from select: %s", strerror(errno));
2613 report_capture_error(errmsg, please_report);
2618 * "select()" says we can read from the pipe without blocking
2620 #endif /* USE_THREADS */
2621 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2631 /* dispatch from pcap */
2632 #ifdef MUST_DO_SELECT
2634 * If we have "pcap_get_selectable_fd()", we use it to get the
2635 * descriptor on which to select; if that's -1, it means there
2636 * is no descriptor on which you can do a "select()" (perhaps
2637 * because you're capturing on a special device, and that device's
2638 * driver unfortunately doesn't support "select()", in which case
2639 * we don't do the select - which means it might not be possible
2640 * to stop a capture until a packet arrives. If that's unacceptable,
2641 * plead with whoever supplies the software for that device to add
2642 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2643 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2644 * later, so it can use pcap_breakloop().
2646 #ifdef LOG_CAPTURE_VERBOSE
2647 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2649 if (pcap_opts->pcap_fd != -1) {
2650 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2653 * "select()" says we can read from it without blocking; go for
2656 * We don't have pcap_breakloop(), so we only process one packet
2657 * per pcap_dispatch() call, to allow a signal to stop the
2658 * processing immediately, rather than processing all packets
2659 * in a batch before quitting.
2662 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb,
2663 (u_char *)&(pcap_opts->interface_id));
2665 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb,
2666 (u_char *)&(pcap_opts->interface_id));
2670 /* Error, rather than pcap_breakloop(). */
2671 pcap_opts->pcap_err = TRUE;
2673 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2676 if (sel_ret < 0 && errno != EINTR) {
2677 g_snprintf(errmsg, errmsg_len,
2678 "Unexpected error from select: %s", strerror(errno));
2679 report_capture_error(errmsg, please_report);
2685 #endif /* MUST_DO_SELECT */
2687 /* dispatch from pcap without select */
2689 #ifdef LOG_CAPTURE_VERBOSE
2690 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2694 * On Windows, we don't support asynchronously telling a process to
2695 * stop capturing; instead, we check for an indication on a pipe
2696 * after processing packets. We therefore process only one packet
2697 * at a time, so that we can check the pipe after every packet.
2700 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)&pcap_opts->interface_id);
2702 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)&pcap_opts->interface_id);
2706 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)&pcap_opts->interface_id);
2708 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)&pcap_opts->interface_id);
2713 /* Error, rather than pcap_breakloop(). */
2714 pcap_opts->pcap_err = TRUE;
2716 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2718 #else /* pcap_next_ex */
2719 #ifdef LOG_CAPTURE_VERBOSE
2720 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2722 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2725 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2726 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2727 * This should be fixed in the WinPcap 4.0 alpha release.
2729 * For reference, an example remote interface:
2730 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2733 /* emulate dispatch from pcap */
2736 struct pcap_pkthdr *pkt_header;
2741 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2743 capture_loop_queue_packet_cb((u_char *)&pcap_opts->interface_id, pkt_header, pkt_data);
2745 capture_loop_write_packet_cb((u_char *)&pcap_opts->interface_id, pkt_header, pkt_data);
2750 pcap_opts->pcap_err = TRUE;
2754 #endif /* pcap_next_ex */
2758 #ifdef LOG_CAPTURE_VERBOSE
2759 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2762 return ld->packet_count - packet_count_before;
2766 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2767 * want to grab only the characters between the '{' and '}' delimiters.
2769 * Returns a GString that must be freed with g_string_free(). */
2771 isolate_uuid(const char *iface)
2776 ptr = strchr(iface, '{');
2778 return g_string_new(iface);
2779 gstr = g_string_new(ptr + 1);
2781 ptr = strchr(gstr->str, '}');
2785 gstr = g_string_truncate(gstr, ptr - gstr->str);
2790 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2791 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2793 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2794 char *errmsg, int errmsg_len)
2797 gchar *capfile_name;
2799 gboolean is_tempfile;
2801 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2802 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2804 if (capture_opts->save_file != NULL) {
2805 /* We return to the caller while the capture is in progress.
2806 * Therefore we need to take a copy of save_file in
2807 * case the caller destroys it after we return.
2809 capfile_name = g_strdup(capture_opts->save_file);
2811 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2812 if (capture_opts->multi_files_on) {
2813 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2814 g_snprintf(errmsg, errmsg_len,
2815 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2816 g_free(capfile_name);
2819 if (strcmp(capfile_name, "-") == 0) {
2820 /* write to stdout */
2823 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2824 _setmode(1, O_BINARY);
2827 } /* if (...output_to_pipe ... */
2830 if (capture_opts->multi_files_on) {
2831 /* ringbuffer is enabled */
2832 *save_file_fd = ringbuf_init(capfile_name,
2833 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2834 capture_opts->group_read_access);
2836 /* we need the ringbuf name */
2837 if(*save_file_fd != -1) {
2838 g_free(capfile_name);
2839 capfile_name = g_strdup(ringbuf_current_filename());
2842 /* Try to open/create the specified file for use as a capture buffer. */
2843 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2844 (capture_opts->group_read_access) ? 0640 : 0600);
2847 is_tempfile = FALSE;
2849 /* Choose a random name for the temporary capture buffer */
2853 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1).name);
2854 prefix = g_strconcat("wireshark_", g_basename(iface->str), NULL);
2855 g_string_free(iface, TRUE);
2857 prefix = g_strconcat("wireshark_", g_basename(g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1).name), NULL);
2859 *save_file_fd = create_tempfile(&tmpname, prefix);
2861 capfile_name = g_strdup(tmpname);
2865 /* did we fail to open the output file? */
2866 if (*save_file_fd == -1) {
2868 g_snprintf(errmsg, errmsg_len,
2869 "The temporary file to which the capture would be saved (\"%s\") "
2870 "could not be opened: %s.", capfile_name, strerror(errno));
2872 if (capture_opts->multi_files_on) {
2873 ringbuf_error_cleanup();
2876 g_snprintf(errmsg, errmsg_len,
2877 "The file to which the capture would be saved (\"%s\") "
2878 "could not be opened: %s.", capfile_name,
2881 g_free(capfile_name);
2885 if(capture_opts->save_file != NULL) {
2886 g_free(capture_opts->save_file);
2888 capture_opts->save_file = capfile_name;
2889 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2890 "g_free(capfile_name)". */
2896 /* Do the work of handling either the file size or file duration capture
2897 conditions being reached, and switching files or stopping. */
2899 do_file_switch_or_stop(capture_options *capture_opts,
2900 condition *cnd_autostop_files,
2901 condition *cnd_autostop_size,
2902 condition *cnd_file_duration)
2905 pcap_options pcap_opts;
2906 interface_options interface_opts;
2907 gboolean successful;
2909 if (capture_opts->multi_files_on) {
2910 if (cnd_autostop_files != NULL &&
2911 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2912 /* no files left: stop here */
2913 global_ld.go = FALSE;
2917 /* Switch to the next ringbuffer file */
2918 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2919 &global_ld.save_file_fd, &global_ld.err)) {
2921 /* File switch succeeded: reset the conditions */
2922 global_ld.bytes_written = 0;
2923 if (capture_opts->use_pcapng) {
2926 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2927 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &(global_ld.bytes_written), &global_ld.err);
2928 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2929 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2930 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
2931 successful = libpcap_write_interface_description_block(global_ld.pdh,
2932 interface_opts.name,
2933 interface_opts.cfilter,
2936 &(global_ld.bytes_written),
2940 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2941 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, 0);
2942 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts.linktype, pcap_opts.snaplen,
2943 &global_ld.bytes_written, &global_ld.err);
2946 fclose(global_ld.pdh);
2947 global_ld.pdh = NULL;
2948 global_ld.go = FALSE;
2951 if (cnd_autostop_size)
2952 cnd_reset(cnd_autostop_size);
2953 if (cnd_file_duration)
2954 cnd_reset(cnd_file_duration);
2955 libpcap_dump_flush(global_ld.pdh, NULL);
2957 report_packet_count(global_ld.inpkts_to_sync_pipe);
2958 global_ld.inpkts_to_sync_pipe = 0;
2959 report_new_capture_file(capture_opts->save_file);
2961 /* File switch failed: stop here */
2962 global_ld.go = FALSE;
2966 /* single file, stop now */
2967 global_ld.go = FALSE;
2974 pcap_read_handler(void* arg)
2976 pcap_options pcap_opts;
2978 char errmsg[MSG_MAX_LENGTH+1];
2980 interface_id = *(guint *)arg;
2982 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, interface_id);
2984 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
2987 while (global_ld.go) {
2988 /* dispatch incoming packets */
2989 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), &pcap_opts);
2991 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
2993 g_thread_exit(NULL);
2997 /* Do the low-level work of a capture.
2998 Returns TRUE if it succeeds, FALSE otherwise. */
3000 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3003 time_t upd_time, cur_time;
3005 struct timeval upd_time, cur_time;
3009 condition *cnd_file_duration = NULL;
3010 condition *cnd_autostop_files = NULL;
3011 condition *cnd_autostop_size = NULL;
3012 condition *cnd_autostop_duration = NULL;
3015 gboolean cfilter_error = FALSE;
3016 char errmsg[MSG_MAX_LENGTH+1];
3017 char secondary_errmsg[MSG_MAX_LENGTH+1];
3018 pcap_options pcap_opts;
3019 interface_options interface_opts;
3022 interface_opts = capture_opts->default_options;
3024 *secondary_errmsg = '\0';
3026 /* init the loop data */
3027 global_ld.go = TRUE;
3028 global_ld.packet_count = 0;
3030 global_ld.report_packet_count = FALSE;
3032 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options));
3033 if (capture_opts->has_autostop_packets)
3034 global_ld.packet_max = capture_opts->autostop_packets;
3036 global_ld.packet_max = 0; /* no limit */
3037 global_ld.inpkts_to_sync_pipe = 0;
3038 global_ld.err = 0; /* no error seen yet */
3039 global_ld.pdh = NULL;
3040 global_ld.autostop_files = 0;
3041 global_ld.save_file_fd = -1;
3043 /* We haven't yet gotten the capture statistics. */
3044 *stats_known = FALSE;
3046 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3047 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3049 /* open the "input file" from network interface or capture pipe */
3050 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3051 secondary_errmsg, sizeof(secondary_errmsg))) {
3054 for (i = 0; i < capture_opts->ifaces->len; i++) {
3055 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3056 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3057 /* init the input filter from the network interface (capture pipe will do nothing) */
3058 switch (capture_loop_init_filter(pcap_opts.pcap_h, pcap_opts.from_cap_pipe,
3059 interface_opts.name,
3060 interface_opts.cfilter)) {
3062 case INITFILTER_NO_ERROR:
3065 case INITFILTER_BAD_FILTER:
3066 cfilter_error = TRUE;
3067 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts.pcap_h));
3070 case INITFILTER_OTHER_ERROR:
3071 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3072 pcap_geterr(pcap_opts.pcap_h));
3073 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3078 /* If we're supposed to write to a capture file, open it for output
3079 (temporary/specified name/ringbuffer) */
3080 if (capture_opts->saving_to_file) {
3081 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3082 errmsg, sizeof(errmsg))) {
3086 /* set up to write to the already-opened capture output file/files */
3087 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3092 /* XXX - capture SIGTERM and close the capture, in case we're on a
3093 Linux 2.0[.x] system and you have to explicitly close the capture
3094 stream in order to turn promiscuous mode off? We need to do that
3095 in other places as well - and I don't think that works all the
3096 time in any case, due to libpcap bugs. */
3098 /* Well, we should be able to start capturing.
3100 Sync out the capture file, so the header makes it to the file system,
3101 and send a "capture started successfully and capture file created"
3102 message to our parent so that they'll open the capture file and
3103 update its windows to indicate that we have a live capture in
3105 libpcap_dump_flush(global_ld.pdh, NULL);
3106 report_new_capture_file(capture_opts->save_file);
3109 /* initialize capture stop (and alike) conditions */
3110 init_capture_stop_conditions();
3111 /* create stop conditions */
3112 if (capture_opts->has_autostop_filesize)
3114 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3115 if (capture_opts->has_autostop_duration)
3116 cnd_autostop_duration =
3117 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3119 if (capture_opts->multi_files_on) {
3120 if (capture_opts->has_file_duration)
3122 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3124 if (capture_opts->has_autostop_files)
3125 cnd_autostop_files =
3126 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3129 /* init the time values */
3131 upd_time = GetTickCount();
3133 gettimeofday(&upd_time, NULL);
3136 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3138 /* WOW, everything is prepared! */
3139 /* please fasten your seat belts, we will enter now the actual capture loop */
3141 pcap_queue = g_async_queue_new();
3142 for (i = 0; i < global_ld.pcaps->len; i++) {
3145 interface_id = (gint *)g_malloc(sizeof(guint));
3147 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3148 pcap_opts.tid = g_thread_create(pcap_read_handler, interface_id, TRUE, NULL);
3149 global_ld.pcaps = g_array_remove_index(global_ld.pcaps, i);
3150 g_array_insert_val(global_ld.pcaps, i, pcap_opts);
3153 while (global_ld.go) {
3154 /* dispatch incoming packets */
3156 GTimeVal write_thread_time;
3157 pcap_queue_element *queue_element;
3159 g_get_current_time(&write_thread_time);
3160 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3161 queue_element = g_async_queue_timed_pop(pcap_queue, &write_thread_time);
3162 if (queue_element) {
3163 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3164 "Dequeued a packet of length %d captured on interface %d.",
3165 queue_element->phdr.caplen,queue_element->interface_id);
3167 capture_loop_write_packet_cb((u_char *)&queue_element->interface_id,
3168 &queue_element->phdr,
3170 g_free(queue_element->pd);
3171 g_free(queue_element);
3177 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3178 sizeof(errmsg), &pcap_opts);
3181 /* Were we asked to print packet counts by the SIGINFO handler? */
3182 if (global_ld.report_packet_count) {
3183 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3184 plurality(global_ld.packet_count, "", "s"));
3185 global_ld.report_packet_count = FALSE;
3190 /* any news from our parent (signal pipe)? -> just stop the capture */
3191 if (!signal_pipe_check_running()) {
3192 global_ld.go = FALSE;
3197 global_ld.inpkts_to_sync_pipe += inpkts;
3199 /* check capture size condition */
3200 if (cnd_autostop_size != NULL &&
3201 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3202 /* Capture size limit reached, do we have another file? */
3203 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3204 cnd_autostop_size, cnd_file_duration))
3206 } /* cnd_autostop_size */
3207 if (capture_opts->output_to_pipe) {
3208 libpcap_dump_flush(global_ld.pdh, NULL);
3212 /* Only update once every 500ms so as not to overload slow displays.
3213 * This also prevents too much context-switching between the dumpcap
3214 * and wireshark processes.
3216 #define DUMPCAP_UPD_TIME 500
3219 cur_time = GetTickCount();
3220 if ( (cur_time - upd_time) > DUMPCAP_UPD_TIME) {
3222 gettimeofday(&cur_time, NULL);
3223 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3224 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3227 upd_time = cur_time;
3230 if (pcap_stats(pch, stats) >= 0) {
3231 *stats_known = TRUE;
3234 /* Let the parent process know. */
3235 if (global_ld.inpkts_to_sync_pipe) {
3237 libpcap_dump_flush(global_ld.pdh, NULL);
3239 /* Send our parent a message saying we've written out
3240 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3242 report_packet_count(global_ld.inpkts_to_sync_pipe);
3244 global_ld.inpkts_to_sync_pipe = 0;
3247 /* check capture duration condition */
3248 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3249 /* The maximum capture time has elapsed; stop the capture. */
3250 global_ld.go = FALSE;
3254 /* check capture file duration condition */
3255 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3256 /* duration limit reached, do we have another file? */
3257 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3258 cnd_autostop_size, cnd_file_duration))
3260 } /* cnd_file_duration */
3264 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3266 pcap_queue_element *queue_element;
3268 for (i = 0; i < global_ld.pcaps->len; i++) {
3269 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3270 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3271 pcap_opts.interface_id);
3272 g_thread_join(pcap_opts.tid);
3273 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3274 pcap_opts.interface_id);
3276 while ((queue_element = g_async_queue_try_pop(pcap_queue))) {
3277 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3278 "Dequeued a packet of length %d captured on interface %d.",
3279 queue_element->phdr.caplen,queue_element->interface_id);
3280 capture_loop_write_packet_cb((u_char *)&queue_element->interface_id,
3281 &queue_element->phdr,
3283 g_free(queue_element->pd);
3284 g_free(queue_element);
3285 global_ld.inpkts_to_sync_pipe += 1;
3286 if (capture_opts->output_to_pipe) {
3287 libpcap_dump_flush(global_ld.pdh, NULL);
3293 /* delete stop conditions */
3294 if (cnd_file_duration != NULL)
3295 cnd_delete(cnd_file_duration);
3296 if (cnd_autostop_files != NULL)
3297 cnd_delete(cnd_autostop_files);
3298 if (cnd_autostop_size != NULL)
3299 cnd_delete(cnd_autostop_size);
3300 if (cnd_autostop_duration != NULL)
3301 cnd_delete(cnd_autostop_duration);
3303 /* did we had a pcap (input) error? */
3304 for (i = 0; i < capture_opts->ifaces->len; i++) {
3305 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3306 if (pcap_opts.pcap_err) {
3307 /* On Linux, if an interface goes down while you're capturing on it,
3308 you'll get a "recvfrom: Network is down" or
3309 "The interface went down" error (ENETDOWN).
3310 (At least you will if strerror() doesn't show a local translation
3313 On FreeBSD and OS X, if a network adapter disappears while
3314 you're capturing on it, you'll get a "read: Device not configured"
3315 error (ENXIO). (See previous parenthetical note.)
3317 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3319 These should *not* be reported to the Wireshark developers. */
3322 cap_err_str = pcap_geterr(pcap_opts.pcap_h);
3323 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3324 strcmp(cap_err_str, "The interface went down") == 0 ||
3325 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3326 strcmp(cap_err_str, "read: I/O error") == 0 ||
3327 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3328 report_capture_error("The network adapter on which the capture was being done "
3329 "is no longer running; the capture has stopped.",
3332 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3334 report_capture_error(errmsg, please_report);
3337 } else if (pcap_opts.from_cap_pipe && pcap_opts.cap_pipe_err == PIPERR) {
3338 report_capture_error(errmsg, "");
3342 /* did we have an output error while capturing? */
3343 if (global_ld.err == 0) {
3346 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3347 global_ld.err, FALSE);
3348 report_capture_error(errmsg, please_report);
3352 if (capture_opts->saving_to_file) {
3353 /* close the output file */
3354 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3358 /* there might be packets not yet notified to the parent */
3359 /* (do this after closing the file, so all packets are already flushed) */
3360 if(global_ld.inpkts_to_sync_pipe) {
3362 report_packet_count(global_ld.inpkts_to_sync_pipe);
3363 global_ld.inpkts_to_sync_pipe = 0;
3366 /* If we've displayed a message about a write error, there's no point
3367 in displaying another message about an error on close. */
3368 if (!close_ok && write_ok) {
3369 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3371 report_capture_error(errmsg, "");
3375 * XXX We exhibit different behaviour between normal mode and sync mode
3376 * when the pipe is stdin and not already at EOF. If we're a child, the
3377 * parent's stdin isn't closed, so if the user starts another capture,
3378 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3379 * will say "Unrecognized libpcap format". On the other hand, in normal
3380 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3383 report_capture_count(); /* print final capture count only if (quiet && !capture_child) */
3385 /* get packet drop statistics from pcap */
3386 for (i = 0; i < capture_opts->ifaces->len; i++) {
3387 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3388 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3389 if (pcap_opts.pcap_h != NULL) {
3390 g_assert(!pcap_opts.from_cap_pipe);
3391 /* Get the capture statistics, so we know how many packets were dropped. */
3392 if (pcap_stats(pcap_opts.pcap_h, stats) >= 0) {
3393 *stats_known = TRUE;
3394 /* Let the parent process know. */
3395 report_packet_drops(stats->ps_recv, stats->ps_drop, interface_opts.name);
3397 g_snprintf(errmsg, sizeof(errmsg),
3398 "Can't get packet-drop statistics: %s",
3399 pcap_geterr(pcap_opts.pcap_h));
3400 report_capture_error(errmsg, please_report);
3405 /* close the input file (pcap or capture pipe) */
3406 capture_loop_close_input(&global_ld);
3408 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3410 /* ok, if the write and the close were successful. */
3411 return write_ok && close_ok;
3414 if (capture_opts->multi_files_on) {
3415 /* cleanup ringbuffer */
3416 ringbuf_error_cleanup();
3418 /* We can't use the save file, and we have no FILE * for the stream
3419 to close in order to close it, so close the FD directly. */
3420 if (global_ld.save_file_fd != -1) {
3421 ws_close(global_ld.save_file_fd);
3424 /* We couldn't even start the capture, so get rid of the capture
3426 if (capture_opts->save_file != NULL) {
3427 ws_unlink(capture_opts->save_file);
3428 g_free(capture_opts->save_file);
3431 capture_opts->save_file = NULL;
3433 report_cfilter_error(interface_opts.cfilter, errmsg);
3435 report_capture_error(errmsg, secondary_errmsg);
3437 /* close the input file (pcap or cap_pipe) */
3438 capture_loop_close_input(&global_ld);
3440 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3446 static void capture_loop_stop(void)
3448 #ifdef HAVE_PCAP_BREAKLOOP
3450 pcap_options pcap_opts;
3452 for (i = 0; i < global_ld.pcaps->len; i++) {
3453 pcap_opts = g_array_index(global_ld.pcaps, pcap_options, i);
3454 if (pcap_opts.pcap_h != NULL)
3455 pcap_breakloop(pcap_opts.pcap_h);
3458 global_ld.go = FALSE;
3463 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3464 int err, gboolean is_close)
3469 g_snprintf(errmsg, errmsglen,
3470 "Not all the packets could be written to the file"
3471 " to which the capture was being saved\n"
3472 "(\"%s\") because there is no space left on the file system\n"
3473 "on which that file resides.",
3479 g_snprintf(errmsg, errmsglen,
3480 "Not all the packets could be written to the file"
3481 " to which the capture was being saved\n"
3482 "(\"%s\") because you are too close to, or over,"
3483 " your disk quota\n"
3484 "on the file system on which that file resides.",
3491 g_snprintf(errmsg, errmsglen,
3492 "The file to which the capture was being saved\n"
3493 "(\"%s\") could not be closed: %s.",
3494 fname, strerror(err));
3496 g_snprintf(errmsg, errmsglen,
3497 "An error occurred while writing to the file"
3498 " to which the capture was being saved\n"
3500 fname, strerror(err));
3507 /* one packet was captured, process it */
3509 capture_loop_write_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
3512 guint interface_id = *(guint *) (void *) user;
3515 /* We may be called multiple times from pcap_dispatch(); if we've set
3516 the "stop capturing" flag, ignore this packet, as we're not
3517 supposed to be saving any more packets. */
3521 if (global_ld.pdh) {
3522 gboolean successful;
3524 /* We're supposed to write the packet to a file; do so.
3525 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3526 "ld->err" to the error. */
3527 if (global_capture_opts.use_pcapng) {
3528 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, interface_id, pd, &global_ld.bytes_written, &err);
3530 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3533 global_ld.go = FALSE;
3534 global_ld.err = err;
3536 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3537 "Wrote a packet of length %d captured on interface %u.",
3538 phdr->caplen, interface_id);
3539 global_ld.packet_count++;
3540 /* if the user told us to stop after x packets, do we already have enough? */
3541 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3542 global_ld.go = FALSE;
3548 /* one packet was captured, queue it */
3550 capture_loop_queue_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
3553 pcap_queue_element *queue_element;
3556 /* We may be called multiple times from pcap_dispatch(); if we've set
3557 the "stop capturing" flag, ignore this packet, as we're not
3558 supposed to be saving any more packets. */
3562 interface_id = *(guint *) (void *) user;
3563 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3564 queue_element->interface_id = interface_id;
3565 queue_element->phdr = *phdr;
3566 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3567 memcpy(queue_element->pd, pd, phdr->caplen);
3568 g_async_queue_push(pcap_queue, queue_element);
3569 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3570 "Queued a packet of length %d captured on interface %u.",
3571 phdr->caplen, interface_id);
3574 /* And now our feature presentation... [ fade to music ] */
3576 main(int argc, char *argv[])
3579 gboolean arg_error = FALSE;
3586 struct sigaction action, oldaction;
3589 gboolean start_capture = TRUE;
3590 gboolean stats_known;
3591 struct pcap_stat stats;
3592 GLogLevelFlags log_flags;
3593 gboolean list_interfaces = FALSE;
3594 gboolean list_link_layer_types = FALSE;
3595 #ifdef HAVE_BPF_IMAGE
3596 gboolean print_bpf_code = FALSE;
3598 gboolean machine_readable = FALSE;
3599 gboolean print_statistics = FALSE;
3600 int status, run_once_args = 0;
3603 #if defined(__APPLE__) && defined(__LP64__)
3604 struct utsname osinfo;
3608 /* Convert our arg list to UTF-8. */
3609 wc_argv = CommandLineToArgvW(GetCommandLineW(), &wc_argc);
3610 if (wc_argv && wc_argc == argc) {
3611 for (i = 0; i < argc; i++) {
3612 argv[i] = g_utf16_to_utf8(wc_argv[i], -1, NULL, NULL, NULL);
3614 } /* XXX else bail because something is horribly, horribly wrong? */
3619 * Initialize our DLL search path. MUST be called before LoadLibrary
3622 ws_init_dll_search_path();
3625 #ifdef HAVE_PCAP_REMOTE
3626 #define OPTSTRING_A "A:"
3627 #define OPTSTRING_r "r"
3628 #define OPTSTRING_u "u"
3630 #define OPTSTRING_A ""
3631 #define OPTSTRING_r ""
3632 #define OPTSTRING_u ""
3635 #ifdef HAVE_PCAP_SETSAMPLING
3636 #define OPTSTRING_m "m:"
3638 #define OPTSTRING_m ""
3641 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3642 #define OPTSTRING_B "B:"
3644 #define OPTSTRING_B ""
3645 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3647 #ifdef HAVE_PCAP_CREATE
3648 #define OPTSTRING_I "I"
3650 #define OPTSTRING_I ""
3653 #ifdef HAVE_BPF_IMAGE
3654 #define OPTSTRING_d "d"
3656 #define OPTSTRING_d ""
3659 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "L" OPTSTRING_m "Mnpq" OPTSTRING_r "Ss:t" OPTSTRING_u "vw:y:Z:"
3661 #ifdef DEBUG_CHILD_DUMPCAP
3662 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3663 fprintf (stderr, "Unable to open debug log file !\n");
3668 #if defined(__APPLE__) && defined(__LP64__)
3670 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3671 * a bug workaround - timeouts less than 1 second don't work with libpcap
3672 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3673 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3674 * The problem is extremely unlikely to be reintroduced in a future
3677 if (uname(&osinfo) == 0) {
3679 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3680 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3681 * number of 10.0.0, not 10.1.0 - go figure).
3683 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3684 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3685 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3686 need_timeout_workaround = TRUE;
3691 * Determine if dumpcap is being requested to run in a special
3692 * capture_child mode by going thru the command line args to see if
3693 * a -Z is present. (-Z is a hidden option).
3695 * The primary result of running in capture_child mode is that
3696 * all messages sent out on stderr are in a special type/len/string
3697 * format to allow message processing by type. These messages include
3698 * error messages if dumpcap fails to start the operation it was
3699 * requested to do, as well as various "status" messages which are sent
3700 * when an actual capture is in progress, and a "success" message sent
3701 * if dumpcap was requested to perform an operation other than a
3704 * Capture_child mode would normally be requested by a parent process
3705 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3706 * to which dumpcap stderr has been redirected. It might also have
3707 * another pipe to obtain dumpcap stdout output; for operations other
3708 * than a capture, that information is formatted specially for easier
3709 * parsing by the parent process.
3711 * Capture_child mode needs to be determined immediately upon
3712 * startup so that any messages generated by dumpcap in this mode
3713 * (eg: during initialization) will be formatted properly.
3716 for (i=1; i<argc; i++) {
3717 if (strcmp("-Z", argv[i]) == 0) {
3718 capture_child = TRUE;
3719 machine_readable = TRUE; /* request machine-readable output */
3721 /* set output pipe to binary mode, to avoid ugly text conversions */
3722 _setmode(2, O_BINARY);
3727 /* The default_log_handler will use stdout, which makes trouble in */
3728 /* capture child mode, as it uses stdout for it's sync_pipe. */
3729 /* So: the filtering is done in the console_log_handler and not here.*/
3730 /* We set the log handlers right up front to make sure that any log */
3731 /* messages when running as child will be sent back to the parent */
3732 /* with the correct format. */
3736 G_LOG_LEVEL_CRITICAL|
3737 G_LOG_LEVEL_WARNING|
3738 G_LOG_LEVEL_MESSAGE|
3741 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3743 g_log_set_handler(NULL,
3745 console_log_handler, NULL /* user_data */);
3746 g_log_set_handler(LOG_DOMAIN_MAIN,
3748 console_log_handler, NULL /* user_data */);
3749 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3751 console_log_handler, NULL /* user_data */);
3752 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3754 console_log_handler, NULL /* user_data */);
3756 /* Initialize the thread system */
3757 if (!g_thread_supported())
3758 g_thread_init(NULL);
3760 /* Load wpcap if possible. Do this before collecting the run-time version information */
3763 /* ... and also load the packet.dll from wpcap */
3764 /* XXX - currently not required, may change later. */
3765 /*wpcap_packet_load();*/
3767 /* Start windows sockets */
3768 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3770 /* Set handler for Ctrl+C key */
3771 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3773 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3775 action.sa_handler = capture_cleanup_handler;
3777 * Arrange that system calls not get restarted, because when
3778 * our signal handler returns we don't want to restart
3779 * a call that was waiting for packets to arrive.
3781 action.sa_flags = 0;
3782 sigemptyset(&action.sa_mask);
3783 sigaction(SIGTERM, &action, NULL);
3784 sigaction(SIGINT, &action, NULL);
3785 sigaction(SIGPIPE, &action, NULL);
3786 sigaction(SIGHUP, NULL, &oldaction);
3787 if (oldaction.sa_handler == SIG_DFL)
3788 sigaction(SIGHUP, &action, NULL);
3791 /* Catch SIGINFO and, if we get it and we're capturing in
3792 quiet mode, report the number of packets we've captured. */
3793 action.sa_handler = report_counts_siginfo;
3794 action.sa_flags = SA_RESTART;
3795 sigemptyset(&action.sa_mask);
3796 sigaction(SIGINFO, &action, NULL);
3797 #endif /* SIGINFO */
3800 /* ----------------------------------------------------------------- */
3801 /* Privilege and capability handling */
3803 /* 1. Running not as root or suid root; no special capabilities. */
3806 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3809 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3811 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3812 /* capabilities; Drop all other capabilities; */
3813 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3814 /* else: after pcap_open_live() in capture_loop_open_input() */
3815 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3816 /* (Note: this means that the process, although logged in */
3817 /* as root, does not have various permissions such as the */
3818 /* ability to bypass file access permissions). */
3819 /* XXX: Should we just leave capabilities alone in this case */
3820 /* so that user gets expected effect that root can do */
3823 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3825 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3826 /* else: after pcap_open_live() in capture_loop_open_input() */
3827 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3828 /* pcap_open_live). */
3830 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3832 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3833 /* capabilities; Drop all other capabilities; */
3834 /* Drop suid privileges (euid=ruid); */
3835 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3836 /* else: after pcap_open_live() in capture_loop_open_input() */
3837 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3839 /* XXX: For some Linux versions/distros with capabilities */
3840 /* a 'normal' process with any capabilities cannot be */
3841 /* 'killed' (signaled) from another (same uid) non-privileged */
3843 /* For example: If (non-suid) Wireshark forks a */
3844 /* child suid dumpcap which acts as described here (case 5), */
3845 /* Wireshark will be unable to kill (signal) the child */
3846 /* dumpcap process until the capabilities have been dropped */
3847 /* (after pcap_open_live()). */
3848 /* This behaviour will apparently be changed in the kernel */
3849 /* to allow the kill (signal) in this case. */
3850 /* See the following for details: */
3851 /* http://www.mail-archive.com/ [wrapped] */
3852 /* linux-security-module@vger.kernel.org/msg02913.html */
3854 /* It is therefore conceivable that if dumpcap somehow hangs */
3855 /* in pcap_open_live or before that wireshark will not */
3856 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3857 /* In this case, exiting wireshark will kill the child */
3858 /* dumpcap process. */
3860 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3861 /* capabilities; Using libcap. Note: capset cmd (which see) */
3862 /* used to assign capabilities to file. */
3864 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3865 /* else: after pcap_open_live() in capture_loop_open_input() */
3866 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3868 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3869 /* longer required (similar to capture). */
3871 /* ----------------------------------------------------------------- */
3873 init_process_policies();
3876 /* If 'started with special privileges' (and using libcap) */
3877 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3878 /* Set euid/egid = ruid/rgid to remove suid privileges */
3879 relinquish_privs_except_capture();
3882 /* Set the initial values in the capture options. This might be overwritten
3883 by the command line parameters. */
3884 capture_opts_init(&global_capture_opts, NULL);
3886 /* Default to capturing the entire packet. */
3887 global_capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
3889 /* We always save to a file - if no file was specified, we save to a
3891 global_capture_opts.saving_to_file = TRUE;
3892 global_capture_opts.has_ring_num_files = TRUE;
3894 /* Now get our args */
3895 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3897 case 'h': /* Print help and exit */
3901 case 'v': /* Show version and exit */
3903 GString *comp_info_str;
3904 GString *runtime_info_str;
3905 /* Assemble the compile-time version information string */
3906 comp_info_str = g_string_new("Compiled ");
3907 get_compiled_version_info(comp_info_str, NULL, NULL);
3909 /* Assemble the run-time version information string */
3910 runtime_info_str = g_string_new("Running ");
3911 get_runtime_version_info(runtime_info_str, NULL);
3912 show_version(comp_info_str, runtime_info_str);
3913 g_string_free(comp_info_str, TRUE);
3914 g_string_free(runtime_info_str, TRUE);
3918 /*** capture option specific ***/
3919 case 'a': /* autostop criteria */
3920 case 'b': /* Ringbuffer option */
3921 case 'c': /* Capture x packets */
3922 case 'f': /* capture filter */
3923 case 'i': /* Use interface x */
3924 case 'n': /* Use pcapng format */
3925 case 'p': /* Don't capture in promiscuous mode */
3926 case 's': /* Set the snapshot (capture) length */
3927 case 'w': /* Write to capture file x */
3928 case 'g': /* enable group read accesson file(s) */
3929 case 'y': /* Set the pcap data link type */
3930 #ifdef HAVE_PCAP_REMOTE
3931 case 'u': /* Use UDP for data transfer */
3932 case 'r': /* Capture own RPCAP traffic too */
3933 case 'A': /* Authentication */
3935 #ifdef HAVE_PCAP_SETSAMPLING
3936 case 'm': /* Sampling */
3938 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3939 case 'B': /* Buffer size */
3940 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3941 #ifdef HAVE_PCAP_CREATE
3942 case 'I': /* Monitor mode */
3944 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
3949 /*** hidden option: Wireshark child mode (using binary output messages) ***/
3951 capture_child = TRUE;
3953 /* set output pipe to binary mode, to avoid ugly text conversions */
3954 _setmode(2, O_BINARY);
3956 * optarg = the control ID, aka the PPID, currently used for the
3959 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
3960 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
3961 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
3962 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
3964 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
3965 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3966 "Signal pipe: Unable to open %s. Dead parent?",
3974 case 'q': /* Quiet */
3981 /*** all non capture option specific ***/
3982 case 'D': /* Print a list of capture devices and exit */
3983 list_interfaces = TRUE;
3986 case 'L': /* Print list of link-layer types and exit */
3987 list_link_layer_types = TRUE;
3990 #ifdef HAVE_BPF_IMAGE
3991 case 'd': /* Print BPF code for capture filter and exit */
3992 print_bpf_code = TRUE;
3996 case 'S': /* Print interface statistics once a second */
3997 print_statistics = TRUE;
4000 case 'M': /* For -D, -L, and -S, print machine-readable output */
4001 machine_readable = TRUE;
4004 case '?': /* Bad flag - print usage message */
4005 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4013 /* user specified file name as regular command-line argument */
4014 /* XXX - use it as the capture file name (or something else)? */
4021 * Extra command line arguments were specified; complain.
4022 * XXX - interpret as capture filter, as tcpdump and tshark do?
4024 cmdarg_err("Invalid argument: %s", argv[0]);
4033 if (run_once_args > 1) {
4034 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4036 } else if (run_once_args == 1) {
4037 /* We're supposed to print some information, rather than
4038 to capture traffic; did they specify a ring buffer option? */
4039 if (global_capture_opts.multi_files_on) {
4040 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4044 /* We're supposed to capture traffic; was the ring buffer option
4045 specified and, if so, does it make sense? */
4046 if (global_capture_opts.multi_files_on) {
4047 /* Ring buffer works only under certain conditions:
4048 a) ring buffer does not work with temporary files;
4049 b) it makes no sense to enable the ring buffer if the maximum
4050 file size is set to "infinite". */
4051 if (global_capture_opts.save_file == NULL) {
4052 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4053 global_capture_opts.multi_files_on = FALSE;
4055 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4056 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4058 /* XXX - this must be redesigned as the conditions changed */
4059 global_capture_opts.multi_files_on = FALSE;
4066 * "-D" requires no interface to be selected; it's supposed to list
4069 if (list_interfaces) {
4070 /* Get the list of interfaces */
4075 if_list = capture_interface_list(&err, &err_str);
4076 if (if_list == NULL) {
4078 case CANT_GET_INTERFACE_LIST:
4079 cmdarg_err("%s", err_str);
4084 case NO_INTERFACES_FOUND:
4086 * If we're being run by another program, just give them
4087 * an empty list of interfaces, don't report this as
4088 * an error; that lets them decide whether to report
4089 * this as an error or not.
4091 if (!machine_readable) {
4092 cmdarg_err("There are no interfaces on which a capture can be done");
4099 if (machine_readable) /* tab-separated values to stdout */
4100 print_machine_readable_interfaces(if_list);
4102 capture_opts_print_interfaces(if_list);
4103 free_interface_list(if_list);
4108 * "-S" requires no interface to be selected; it gives statistics
4109 * for all interfaces.
4111 if (print_statistics) {
4112 status = print_statistics_loop(machine_readable);
4117 * "-L", "-d", and capturing act on a particular interface, so we have to
4118 * have an interface; if none was specified, pick a default.
4120 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4121 /* cmdarg_err() already called .... */
4125 /* Let the user know what interfaces were chosen. */
4126 /* get_interface_descriptive_name() is not available! */
4127 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4128 interface_options interface_opts;
4130 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4131 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s", interface_opts.name);
4134 if (list_link_layer_types) {
4135 /* Get the list of link-layer types for the capture device. */
4136 if_capabilities_t *caps;
4140 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4141 interface_options interface_opts;
4143 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4144 caps = get_if_capabilities(interface_opts.name,
4145 interface_opts.monitor_mode, &err_str);
4147 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4148 "Please check to make sure you have sufficient permissions, and that\n"
4149 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4153 if (caps->data_link_types == NULL) {
4154 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4157 if (machine_readable) /* tab-separated values to stdout */
4158 /* XXX: We need to change the format and adopt consumers */
4159 print_machine_readable_if_capabilities(caps);
4161 /* XXX: We might want to print also the interface name */
4162 capture_opts_print_if_capabilities(caps, interface_opts.name,
4163 interface_opts.monitor_mode);
4164 free_if_capabilities(caps);
4169 /* We're supposed to do a capture, or print the BPF code for a filter.
4170 Process the snapshot length, as that affects the generated BPF code. */
4171 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4173 #ifdef HAVE_BPF_IMAGE
4174 if (print_bpf_code) {
4175 show_filter_code(&global_capture_opts);
4180 /* We're supposed to do a capture. Process the ring buffer arguments. */
4181 capture_opts_trim_ring_num_files(&global_capture_opts);
4183 /* Now start the capture. */
4185 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4189 /* capture failed */
4192 return 0; /* never here, make compiler happy */
4197 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4198 const char *message, gpointer user_data _U_)
4205 /* ignore log message, if log_level isn't interesting */
4206 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4207 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4212 /* create a "timestamp" */
4214 today = localtime(&curr);
4216 switch(log_level & G_LOG_LEVEL_MASK) {
4217 case G_LOG_LEVEL_ERROR:
4220 case G_LOG_LEVEL_CRITICAL:
4223 case G_LOG_LEVEL_WARNING:
4226 case G_LOG_LEVEL_MESSAGE:
4229 case G_LOG_LEVEL_INFO:
4232 case G_LOG_LEVEL_DEBUG:
4236 fprintf(stderr, "unknown log_level %u\n", log_level);
4238 g_assert_not_reached();
4241 /* Generate the output message */
4242 if(log_level & G_LOG_LEVEL_MESSAGE) {
4243 /* normal user messages without additional infos */
4244 msg = g_strdup_printf("%s\n", message);
4246 /* info/debug messages with additional infos */
4247 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4248 today->tm_hour, today->tm_min, today->tm_sec,
4249 log_domain != NULL ? log_domain : "",
4253 /* DEBUG & INFO msgs (if we're debugging today) */
4254 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4255 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4256 #ifdef DEBUG_DUMPCAP
4257 fprintf(stderr, "%s", msg);
4260 #ifdef DEBUG_CHILD_DUMPCAP
4261 fprintf(debug_log, "%s", msg);
4269 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4270 /* to parent especially formatted if dumpcap running as child. */
4271 if (capture_child) {
4272 sync_pipe_errmsg_to_parent(2, msg, "");
4274 fprintf(stderr, "%s", msg);
4281 /****************************************************************************************************************/
4282 /* indication report routines */
4286 report_packet_count(int packet_count)
4288 char tmp[SP_DECISIZE+1+1];
4289 static int count = 0;
4292 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4293 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4294 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4296 count += packet_count;
4297 fprintf(stderr, "\rPackets: %u ", count);
4298 /* stderr could be line buffered */
4304 report_new_capture_file(const char *filename)
4307 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4308 pipe_write_block(2, SP_FILE, filename);
4312 * Prevent a SIGINFO handler from writing to the standard error
4313 * while we're doing so; instead, have it just set a flag telling
4314 * us to print that information when we're done.
4317 #endif /* SIGINFO */
4318 fprintf(stderr, "File: %s\n", filename);
4319 /* stderr could be line buffered */
4324 * Allow SIGINFO handlers to write.
4329 * If a SIGINFO handler asked us to write out capture counts, do so.
4332 report_counts_for_siginfo();
4333 #endif /* SIGINFO */
4338 report_cfilter_error(const char *cfilter, const char *errmsg)
4340 if (capture_child) {
4341 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4342 pipe_write_block(2, SP_BAD_FILTER, errmsg);
4345 "Invalid capture filter: \"%s\"!\n"
4347 "That string isn't a valid capture filter (%s).\n"
4348 "See the User's Guide for a description of the capture filter syntax.\n",
4354 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4357 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4358 "Primary Error: %s", error_msg);
4359 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4360 "Secondary Error: %s", secondary_error_msg);
4361 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4363 fprintf(stderr, "%s\n", error_msg);
4364 if (secondary_error_msg[0] != '\0')
4365 fprintf(stderr, "%s\n", secondary_error_msg);
4370 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4372 char tmp1[SP_DECISIZE+1+1];
4373 char tmp2[SP_DECISIZE+1+1];
4375 g_snprintf(tmp1, sizeof(tmp1), "%u", received);
4376 g_snprintf(tmp2, sizeof(tmp2), "%u", drops);
4379 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets captured/dropped on interface %s: %s/%s", name, tmp1, tmp2);
4380 /* XXX: Need to provide interface id, changes to consumers required. */
4381 pipe_write_block(2, SP_DROPS, tmp2);
4383 fprintf(stderr, "Packets captured/dropped on interface %s: %s/%s\n", name, tmp1, tmp2);
4384 /* stderr could be line buffered */
4390 /****************************************************************************************************************/
4391 /* signal_pipe handling */
4396 signal_pipe_check_running(void)
4398 /* any news from our parent? -> just stop the capture */
4402 /* if we are running standalone, no check required */
4403 if(!capture_child) {
4407 if(!sig_pipe_name || !sig_pipe_handle) {
4408 /* This shouldn't happen */
4409 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4410 "Signal pipe: No name or handle");
4415 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4416 * at this point. Should we check to see if the parent is still alive,
4417 * e.g. by using OpenProcess?
4420 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4422 if(!result || avail > 0) {
4423 /* peek failed or some bytes really available */
4424 /* (if not piping from stdin this would fail) */
4425 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4426 "Signal pipe: Stop capture: %s", sig_pipe_name);
4427 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4428 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4429 sig_pipe_handle, result, avail);
4432 /* pipe ok and no bytes available */
4439 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4444 * indent-tabs-mode: nil
4447 * vi: set shiftwidth=4 tabstop=8 expandtab
4448 * :indentSize=4:tabSize=8:noTabs=true: