3 * Wireshark - Network traffic analyzer
4 * By Gerald Combs <gerald@wireshark.org>
5 * Copyright 1998 Gerald Combs
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <stdlib.h> /* for exit() */
30 #ifdef HAVE_SYS_TYPES_H
31 # include <sys/types.h>
34 #ifdef HAVE_SYS_SOCKET_H
35 #include <sys/socket.h>
38 #ifdef HAVE_NETINET_IN_H
39 #include <netinet/in.h>
46 #ifdef HAVE_ARPA_INET_H
47 #include <arpa/inet.h>
50 #if defined(__APPLE__) && defined(__LP64__)
51 #include <sys/utsname.h>
57 #include <wsutil/cmdarg_err.h>
58 #include <wsutil/crash_info.h>
59 #include <ws_version_info.h>
61 #ifndef HAVE_GETOPT_LONG
62 #include "wsutil/wsgetopt.h"
70 # include <sys/prctl.h>
71 # include <sys/capability.h>
74 #include "ringbuffer.h"
76 #include "caputils/capture_ifinfo.h"
77 #include "caputils/capture-pcap-util.h"
78 #include "caputils/capture-pcap-util-int.h"
80 #include "caputils/capture-wpcap.h"
83 #include "writecap/pcapio.h"
86 #include <wsutil/unicode-utils.h>
93 #include <wsutil/clopts_common.h>
94 #include <wsutil/privileges.h>
96 #include "sync_pipe.h"
98 #include "capture_opts.h"
99 #include <capchild/capture_session.h>
100 #include <capchild/capture_sync.h>
102 #include "conditions.h"
103 #include "capture_stop_conditions.h"
105 #include "wsutil/tempfile.h"
107 #include "wsutil/file_util.h"
108 #include "wsutil/os_version_info.h"
109 #include "wsutil/str_util.h"
110 #include "wsutil/inet_addr.h"
112 #include "caputils/ws80211_utils.h"
119 * Get information about libpcap format from "wiretap/libpcap.h".
120 * Get information about pcapng format from "wiretap/pcapng_module.h".
121 * XXX - can we just use pcap_open_offline() to read the pipe?
123 #include "wiretap/libpcap.h"
124 #include "wiretap/pcapng_module.h"
126 /**#define DEBUG_DUMPCAP**/
127 /**#define DEBUG_CHILD_DUMPCAP**/
131 #include <conio.h> /* _getch() */
135 #ifdef DEBUG_CHILD_DUMPCAP
136 FILE *debug_log; /* for logging debug messages to */
137 /* a file if DEBUG_CHILD_DUMPCAP */
141 static GAsyncQueue *pcap_queue;
142 static gint64 pcap_queue_bytes;
143 static gint64 pcap_queue_packets;
144 static gint64 pcap_queue_byte_limit = 0;
145 static gint64 pcap_queue_packet_limit = 0;
147 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
149 static gchar *sig_pipe_name = NULL;
150 static HANDLE sig_pipe_handle = NULL;
151 static gboolean signal_pipe_check_running(void);
155 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
156 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
159 /** Stop a low-level capture (stops the capture child). */
160 static void capture_loop_stop(void);
161 /** Close a pipe, or socket if \a from_socket is TRUE */
162 static void cap_pipe_close(int pipe_fd, gboolean from_socket _U_);
166 * Enable kernel BPF JIT compiler if available.
167 * If any calls fail, just drive on - the JIT compiler might not be
168 * enabled, but filtering will still work, and it's not clear what
169 * we could do if the calls fail; should we just report the error
170 * and not continue to capture, should we report it as a warning, or
174 enable_kernel_bpf_jit_compiler(void)
178 static const char file[] = "/proc/sys/net/core/bpf_jit_enable";
180 fd = ws_open(file, O_WRONLY);
184 written = ws_write(fd, "1", strlen("1"));
190 #if !defined (__linux__)
191 #ifndef HAVE_PCAP_BREAKLOOP
193 * We don't have pcap_breakloop(), which is the only way to ensure that
194 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
195 * won't, if the call to read the next packet or batch of packets is
196 * is interrupted by a signal on UN*X, just go back and try again to
199 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
200 * the signal handler, set a flag to stop capturing; however, without
201 * a guarantee of that sort, we can't guarantee that we'll stop capturing
202 * if the read will be retried and won't time out if no packets arrive.
204 * Therefore, on at least some platforms, we work around the lack of
205 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
206 * to wait for packets to arrive, so that we're probably going to be
207 * blocked in the select() when the signal arrives, and can just bail
208 * out of the loop at that point.
210 * However, we don't want to do that on BSD (because "select()" doesn't work
211 * correctly on BPF devices on at least some releases of some flavors of
212 * BSD), and we don't want to do it on Windows (because "select()" is
213 * something for sockets, not for arbitrary handles). (Note that "Windows"
214 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
215 * using WinPcap, not a UNIX libpcap.)
217 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
218 * on BSD times out even if no packets have arrived, so we'll eventually
219 * exit pcap_dispatch() with an indication that no packets have arrived,
220 * and will break out of the capture loop at that point.
222 * On Windows, we can't send a SIGINT to stop capturing, so none of this
223 * applies in any case.
225 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
226 * want to include it if it's not present on this platform, however.
228 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
229 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
231 # define MUST_DO_SELECT
232 # endif /* avoid select */
233 #endif /* HAVE_PCAP_BREAKLOOP */
235 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
236 * in pcap_dispatch(); on the other hand, select() works just fine there.
237 * Hence we use a select for that come what may.
239 * XXX - with TPACKET_V1 and TPACKET_V2, it currently uses select()
240 * internally, and, with TPACKET_V3, once that's supported, it'll
241 * support timeouts, at least as I understand the way the code works.
243 #define MUST_DO_SELECT
246 /** init the capture filter */
249 INITFILTER_BAD_FILTER,
250 INITFILTER_OTHER_ERROR
251 } initfilter_status_t;
254 STATE_EXPECT_REC_HDR,
267 typedef struct _pcap_options {
272 #ifdef MUST_DO_SELECT
273 int pcap_fd; /**< pcap file descriptor */
280 gboolean ts_nsec; /**< TRUE if we're using nanosecond precision. */
281 /**< capture pipe (unix only "input file") */
282 gboolean from_cap_pipe; /**< TRUE if we are capturing data from a capture pipe */
283 gboolean from_cap_socket; /**< TRUE if we're capturing from socket */
284 struct pcap_hdr cap_pipe_hdr; /**< Pcap header when capturing from a pipe */
285 struct pcaprec_modified_hdr cap_pipe_rechdr; /**< Pcap record header when capturing from a pipe */
287 HANDLE cap_pipe_h; /**< The handle of the capture pipe */
289 int cap_pipe_fd; /**< the file descriptor of the capture pipe */
290 gboolean cap_pipe_modified; /**< TRUE if data in the pipe uses modified pcap headers */
291 gboolean cap_pipe_byte_swapped; /**< TRUE if data in the pipe is byte swapped */
293 char * cap_pipe_buf; /**< Pointer to the data buffer we read into */
294 DWORD cap_pipe_bytes_to_read; /**< Used by cap_pipe_dispatch */
295 DWORD cap_pipe_bytes_read; /**< Used by cap_pipe_dispatch */
297 size_t cap_pipe_bytes_to_read; /**< Used by cap_pipe_dispatch */
298 size_t cap_pipe_bytes_read; /**< Used by cap_pipe_dispatch */
300 cap_pipe_state_t cap_pipe_state;
301 cap_pipe_err_t cap_pipe_err;
304 GMutex *cap_pipe_read_mtx;
305 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
309 typedef struct _loop_data {
311 gboolean go; /**< TRUE as long as we're supposed to keep capturing */
312 int err; /**< if non-zero, error seen while capturing */
313 gint packet_count; /**< Number of packets we have already captured */
314 gint packet_max; /**< Number of packets we're supposed to capture - 0 means infinite */
315 guint inpkts_to_sync_pipe; /**< Packets not already send out to the sync_pipe */
317 gboolean report_packet_count; /**< Set by SIGINFO handler; print packet count */
323 guint64 bytes_written;
324 guint32 autostop_files;
327 typedef struct _pcap_queue_element {
328 pcap_options *pcap_opts;
329 struct pcap_pkthdr phdr;
331 } pcap_queue_element;
334 * Standard secondary message for unexpected errors.
336 static const char please_report[] =
337 "Please report this to the Wireshark developers.\n"
338 "https://bugs.wireshark.org/\n"
339 "(This is not a crash; please do not report it as such.)";
342 * This needs to be static, so that the SIGINT handler can clear the "go"
345 static loop_data global_ld;
348 * Timeout, in milliseconds, for reads from the stream of captured packets
349 * from a capture device.
351 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
352 * 64-bit applications, with sub-second timeouts not to work. The bug is
353 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
355 #if defined(__APPLE__) && defined(__LP64__)
356 static gboolean need_timeout_workaround;
358 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
360 #define CAP_READ_TIMEOUT 250
364 * Timeout, in microseconds, for reads from the stream of captured packets
365 * from a pipe. Pipes don't have the same problem that BPF devices do
366 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
367 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
368 * of the offending versions of Snow Leopard.
370 * On Windows this value is converted to milliseconds and passed to
371 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
372 * will return immediately.
375 #define PIPE_READ_TIMEOUT 100000
377 #define PIPE_READ_TIMEOUT 250000
380 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
383 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
384 const char *message, gpointer user_data _U_);
386 /* capture related options */
387 static capture_options global_capture_opts;
388 static gboolean quiet = FALSE;
389 static gboolean use_threads = FALSE;
390 static guint64 start_time;
392 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
394 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
396 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
397 int err, gboolean is_close);
399 static void WS_NORETURN exit_main(int err);
401 static void report_new_capture_file(const char *filename);
402 static void report_packet_count(unsigned int packet_count);
403 static void report_packet_drops(guint32 received, guint32 pcap_drops, guint32 drops, guint32 flushed, guint32 ps_ifdrop, gchar *name);
404 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
405 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
407 #define MSG_MAX_LENGTH 4096
409 /* Copied from pcapio.c pcapng_write_interface_statistics_block()*/
411 create_timestamp(void) {
421 * Current time, represented as 100-nanosecond intervals since
422 * January 1, 1601, 00:00:00 UTC.
424 * I think DWORD might be signed, so cast both parts of "now"
425 * to guint32 so that the sign bit doesn't get treated specially.
427 * Windows 8 provides GetSystemTimePreciseAsFileTime which we
428 * might want to use instead.
430 GetSystemTimeAsFileTime(&now);
431 timestamp = (((guint64)(guint32)now.dwHighDateTime) << 32) +
432 (guint32)now.dwLowDateTime;
435 * Convert to same thing but as 1-microsecond, i.e. 1000-nanosecond,
441 * Subtract difference, in microseconds, between January 1, 1601
442 * 00:00:00 UTC and January 1, 1970, 00:00:00 UTC.
444 timestamp -= G_GUINT64_CONSTANT(11644473600000000);
447 * Current time, represented as seconds and microseconds since
448 * January 1, 1970, 00:00:00 UTC.
450 gettimeofday(&now, NULL);
453 * Convert to delta in microseconds.
455 timestamp = (guint64)(now.tv_sec) * 1000000 +
456 (guint64)(now.tv_usec);
462 print_usage(FILE *output)
464 fprintf(output, "\nUsage: dumpcap [options] ...\n");
465 fprintf(output, "\n");
466 fprintf(output, "Capture interface:\n");
467 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback),\n"
468 " or for remote capturing, use one of these formats:\n"
469 " rpcap://<host>/<interface>\n"
470 " TCP@<host>:<port>\n");
471 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
472 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
473 fprintf(output, " -p don't capture in promiscuous mode\n");
474 #ifdef HAVE_PCAP_CREATE
475 fprintf(output, " -I capture in monitor mode, if available\n");
477 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
478 fprintf(output, " -B <buffer size> size of kernel buffer in MiB (def: %dMiB)\n", DEFAULT_CAPTURE_BUFFER_SIZE);
480 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
481 fprintf(output, " -D print list of interfaces and exit\n");
482 fprintf(output, " -L print list of link-layer types of iface and exit\n");
483 #ifdef HAVE_BPF_IMAGE
484 fprintf(output, " -d print generated BPF code for capture filter\n");
486 fprintf(output, " -k set channel on wifi interface:\n"
487 " <freq>,[<type>],[<center_freq1>],[<center_freq2>]\n");
488 fprintf(output, " -S print statistics for each interface once per second\n");
489 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
490 fprintf(output, "\n");
491 #ifdef HAVE_PCAP_REMOTE
492 fprintf(output, "RPCAP options:\n");
493 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
494 fprintf(output, " -u use UDP for RPCAP data transfer\n");
495 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
496 #ifdef HAVE_PCAP_SETSAMPLING
497 fprintf(output, " -m <sampling type> use packet sampling\n");
498 fprintf(output, " count:NUM - capture one packet of every NUM\n");
499 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
502 fprintf(output, "Stop conditions:\n");
503 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
504 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
505 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
506 fprintf(output, " files:NUM - stop after NUM files\n");
507 /*fprintf(output, "\n");*/
508 fprintf(output, "Output (files):\n");
509 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
510 fprintf(output, " -g enable group read access on the output file(s)\n");
511 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
512 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
513 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
514 fprintf(output, " -n use pcapng format instead of pcap (default)\n");
515 fprintf(output, " -P use libpcap format instead of pcapng\n");
516 fprintf(output, " --capture-comment <comment>\n");
517 fprintf(output, " add a capture comment to the output file\n");
518 fprintf(output, " (only for pcapng)\n");
519 fprintf(output, "\n");
520 fprintf(output, "Miscellaneous:\n");
521 fprintf(output, " -N <packet_limit> maximum number of packets buffered within dumpcap\n");
522 fprintf(output, " -C <byte_limit> maximum number of bytes used for buffering packets\n");
523 fprintf(output, " within dumpcap\n");
524 fprintf(output, " -t use a separate thread per interface\n");
525 fprintf(output, " -q don't report packet capture counts\n");
526 fprintf(output, " -v print version information and exit\n");
527 fprintf(output, " -h display this help and exit\n");
528 fprintf(output, "\n");
530 fprintf(output, "WARNING: dumpcap will enable kernel BPF JIT compiler if available.\n");
531 fprintf(output, "You might want to reset it\n");
532 fprintf(output, "By doing \"echo 0 > /proc/sys/net/core/bpf_jit_enable\"\n");
533 fprintf(output, "\n");
535 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcapng\n");
536 fprintf(output, "\"Capture packets from interface eth0 until 60s passed into output.pcapng\"\n");
537 fprintf(output, "\n");
538 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
542 * Report an error in command-line arguments.
543 * If we're a capture child, send a message back to the parent, otherwise
547 dumpcap_cmdarg_err(const char *fmt, va_list ap)
551 /* Generate a 'special format' message back to parent */
552 msg = g_strdup_vprintf(fmt, ap);
553 sync_pipe_errmsg_to_parent(2, msg, "");
556 fprintf(stderr, "dumpcap: ");
557 vfprintf(stderr, fmt, ap);
558 fprintf(stderr, "\n");
563 * Report additional information for an error in command-line arguments.
564 * If we're a capture child, send a message back to the parent, otherwise
568 dumpcap_cmdarg_err_cont(const char *fmt, va_list ap)
572 msg = g_strdup_vprintf(fmt, ap);
573 sync_pipe_errmsg_to_parent(2, msg, "");
576 vfprintf(stderr, fmt, ap);
577 fprintf(stderr, "\n");
583 #if 0 /* Set to enable capability debugging */
584 /* see 'man cap_to_text()' for explanation of output */
585 /* '=' means 'all= ' ie: no capabilities */
586 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
588 print_caps(const char *pfx) {
589 cap_t caps = cap_get_proc();
590 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
591 "%s: EUID: %d Capabilities: %s", pfx,
592 geteuid(), cap_to_text(caps, NULL));
595 print_caps(const char *pfx _U_) {
600 relinquish_all_capabilities(void)
602 /* Drop any and all capabilities this process may have. */
603 /* Allowed whether or not process has any privileges. */
604 cap_t caps = cap_init(); /* all capabilities initialized to off */
605 print_caps("Pre-clear");
606 if (cap_set_proc(caps)) {
607 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
609 print_caps("Post-clear");
615 get_capture_device_open_failure_messages(const char *open_err_str,
617 char *errmsg, size_t errmsg_len,
618 char *secondary_errmsg,
619 size_t secondary_errmsg_len)
622 const char *libpcap_warn;
623 static const char ppamsg[] = "can't find PPA for ";
626 g_snprintf(errmsg, (gulong) errmsg_len,
627 "The capture session could not be initiated on interface '%s' (%s).",
628 iface, open_err_str);
631 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
633 "In order to capture packets, WinPcap must be installed; see\n"
635 " https://www.winpcap.org/\n"
637 "for a downloadable version of WinPcap and for instructions on how to install\n"
640 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
642 "Please check that \"%s\" is the proper interface.\n"
645 "Help can be found at:\n"
647 " https://wiki.wireshark.org/WinPcap\n"
648 " https://wiki.wireshark.org/CaptureSetup\n",
652 /* If we got a "can't find PPA for X" message, warn the user (who
653 is running dumpcap on HP-UX) that they don't have a version of
654 libpcap that properly handles HP-UX (libpcap 0.6.x and later
655 versions, which properly handle HP-UX, say "can't find /dev/dlpi
656 PPA for X" rather than "can't find PPA for X"). */
657 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
660 "You are running (T)Wireshark with a version of the libpcap library\n"
661 "that doesn't handle HP-UX network devices well; this means that\n"
662 "(T)Wireshark may not be able to capture packets.\n"
664 "To fix this, you should install libpcap 0.6.2, or a later version\n"
665 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
666 "packaged binary form from the Software Porting And Archive Centre\n"
667 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
668 "at the URL lists a number of mirror sites.";
672 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
673 "Please check to make sure you have sufficient permissions, and that you have "
674 "the proper interface or pipe specified.%s", libpcap_warn);
679 compile_capture_filter(const char *iface, pcap_t *pcap_h,
680 struct bpf_program *fcode, const char *cfilter)
682 bpf_u_int32 netnum, netmask;
683 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
685 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
687 * Well, we can't get the netmask for this interface; it's used
688 * only for filters that check for broadcast IP addresses, so
689 * we just punt and use 0. It might be nice to warn the user,
690 * but that's a pain in a GUI application, as it'd involve popping
691 * up a message box, and it's not clear how often this would make
692 * a difference (only filters that check for IP broadcast addresses
696 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
701 * Sigh. Older versions of libpcap don't properly declare the
702 * third argument to pcap_compile() as a const pointer. Cast
706 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
712 #ifdef HAVE_BPF_IMAGE
714 show_filter_code(capture_options *capture_opts)
716 interface_options interface_opts;
718 gchar open_err_str[PCAP_ERRBUF_SIZE];
719 char errmsg[MSG_MAX_LENGTH+1];
720 char secondary_errmsg[MSG_MAX_LENGTH+1];
721 struct bpf_program fcode;
722 struct bpf_insn *insn;
726 for (j = 0; j < capture_opts->ifaces->len; j++) {
727 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
728 pcap_h = open_capture_device(capture_opts, &interface_opts,
729 CAP_READ_TIMEOUT, &open_err_str);
730 if (pcap_h == NULL) {
731 /* Open failed; get messages */
732 get_capture_device_open_failure_messages(open_err_str,
734 errmsg, sizeof errmsg,
736 sizeof secondary_errmsg);
737 /* And report them */
738 report_capture_error(errmsg, secondary_errmsg);
742 /* Set the link-layer type. */
743 if (!set_pcap_datalink(pcap_h, interface_opts.linktype, interface_opts.name,
744 errmsg, sizeof errmsg,
745 secondary_errmsg, sizeof secondary_errmsg)) {
747 report_capture_error(errmsg, secondary_errmsg);
751 /* OK, try to compile the capture filter. */
752 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
753 interface_opts.cfilter)) {
755 report_cfilter_error(capture_opts, j, errmsg);
760 /* Now print the filter code. */
761 insn = fcode.bf_insns;
763 for (i = 0; i < fcode.bf_len; insn++, i++)
764 printf("%s\n", bpf_image(insn, i));
766 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
767 /* to remove any suid privileges. */
768 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
769 /* (euid/egid have already previously been set to ruid/rgid. */
770 /* (See comment in main() for details) */
772 relinquish_special_privs_perm();
774 relinquish_all_capabilities();
777 /* Let our parent know we succeeded. */
778 pipe_write_block(2, SP_SUCCESS, NULL);
785 * capture_interface_list() is expected to do the right thing to get
786 * a list of interfaces.
788 * In most of the programs in the Wireshark suite, "the right thing"
789 * is to run dumpcap and ask it for the list, because dumpcap may
790 * be the only program in the suite with enough privileges to get
793 * In dumpcap itself, however, we obviously can't run dumpcap to
794 * ask for the list. Therefore, our capture_interface_list() should
795 * just call get_interface_list().
798 capture_interface_list(int *err, char **err_str, void(*update_cb)(void) _U_)
800 return get_interface_list(err, err_str);
803 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
805 * Output a machine readable list of the interfaces
806 * This list is retrieved by the sync_interface_list_open() function
807 * The actual output of this function can be viewed with the command "dumpcap -D -Z none"
810 print_machine_readable_interfaces(GList *if_list)
817 char addr_str[ADDRSTRLEN];
820 /* Let our parent know we succeeded. */
821 pipe_write_block(2, SP_SUCCESS, NULL);
824 i = 1; /* Interface id number */
825 for (if_entry = g_list_first(if_list); if_entry != NULL;
826 if_entry = g_list_next(if_entry)) {
827 if_info = (if_info_t *)if_entry->data;
828 printf("%d. %s\t", i++, if_info->name);
831 * Print the contents of the if_entry struct in a parseable format.
832 * Each if_entry element is tab-separated. Addresses are comma-
835 /* XXX - Make sure our description doesn't contain a tab */
836 if (if_info->vendor_description != NULL)
837 printf("%s\t", if_info->vendor_description);
841 /* XXX - Make sure our friendly name doesn't contain a tab */
842 if (if_info->friendly_name != NULL)
843 printf("%s\t", if_info->friendly_name);
847 printf("%i\t", if_info->type);
849 for (addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
850 addr = g_slist_next(addr)) {
851 if (addr != g_slist_nth(if_info->addrs, 0))
854 if_addr = (if_addr_t *)addr->data;
855 switch(if_addr->ifat_type) {
857 if (ws_inet_ntop4(&if_addr->addr.ip4_addr, addr_str,
859 printf("%s", addr_str);
861 printf("<unknown IPv4>");
865 if (ws_inet_ntop6(&if_addr->addr.ip6_addr,
866 addr_str, ADDRSTRLEN)) {
867 printf("%s", addr_str);
869 printf("<unknown IPv6>");
873 printf("<type unknown %i>", if_addr->ifat_type);
877 if (if_info->loopback)
878 printf("\tloopback");
882 printf("\t%s", if_info->extcap);
889 * If you change the machine-readable output format of this function,
890 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
893 print_machine_readable_if_capabilities(if_capabilities_t *caps)
896 data_link_info_t *data_link_info;
897 const gchar *desc_str;
900 /* Let our parent know we succeeded. */
901 pipe_write_block(2, SP_SUCCESS, NULL);
904 if (caps->can_set_rfmon)
908 for (lt_entry = caps->data_link_types; lt_entry != NULL;
909 lt_entry = g_list_next(lt_entry)) {
910 data_link_info = (data_link_info_t *)lt_entry->data;
911 if (data_link_info->description != NULL)
912 desc_str = data_link_info->description;
914 desc_str = "(not supported)";
915 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
925 /* Print the number of packets captured for each interface until we're killed. */
927 print_statistics_loop(gboolean machine_readable)
929 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
935 char errbuf[PCAP_ERRBUF_SIZE];
938 if_list = get_interface_list(&err, &err_str);
939 if (if_list == NULL) {
941 cmdarg_err("There are no interfaces on which a capture can be done");
943 cmdarg_err("%s", err_str);
949 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
950 if_info = (if_info_t *)if_entry->data;
953 /* On Linux nf* interfaces don't collect stats properly and don't allows multiple
954 * connections. We avoid collecting stats on them.
956 if (!strncmp(if_info->name, "nf", 2)) {
957 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Skipping interface %s for stats",
963 #ifdef HAVE_PCAP_OPEN
964 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
966 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
970 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
971 if_stat->name = g_strdup(if_info->name);
973 stat_list = g_list_append(stat_list, if_stat);
978 cmdarg_err("There are no interfaces on which a capture can be done");
983 /* Let our parent know we succeeded. */
984 pipe_write_block(2, SP_SUCCESS, NULL);
987 if (!machine_readable) {
988 printf("%-15s %10s %10s\n", "Interface", "Received",
993 while (global_ld.go) {
994 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
995 if_stat = (if_stat_t *)stat_entry->data;
996 pcap_stats(if_stat->pch, &ps);
998 if (!machine_readable) {
999 printf("%-15s %10u %10u\n", if_stat->name,
1000 ps.ps_recv, ps.ps_drop);
1002 printf("%s\t%u\t%u\n", if_stat->name,
1003 ps.ps_recv, ps.ps_drop);
1008 /* If we have a dummy signal pipe check it */
1009 if (!signal_pipe_check_running()) {
1010 global_ld.go = FALSE;
1018 /* XXX - Not reached. Should we look for 'q' in stdin? */
1019 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1020 if_stat = (if_stat_t *)stat_entry->data;
1021 pcap_close(if_stat->pch);
1022 g_free(if_stat->name);
1025 g_list_free(stat_list);
1026 free_interface_list(if_list);
1034 capture_cleanup_handler(DWORD dwCtrlType)
1036 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1037 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1038 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1039 like SIGTERM at least when the machine's shutting down.
1041 For now, if we're running as a command rather than a capture child,
1042 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1043 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1044 in that way on UN*X.
1046 If we're not running as a capture child, we might be running as
1047 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1048 user logs out. (XXX - can we explicitly check whether we're
1049 running as a service?) */
1051 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1052 "Console: Control signal");
1053 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1054 "Console: Control signal, CtrlType: %u", dwCtrlType);
1056 /* Keep capture running if we're a service and a user logs off */
1057 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1058 capture_loop_stop();
1066 capture_cleanup_handler(int signum _U_)
1068 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1069 SIGTERM. We assume that if the user wanted it to keep running
1070 after they logged out, they'd have nohupped it. */
1072 /* Note: don't call g_log() in the signal handler: if we happened to be in
1073 * g_log() in process context when the signal came in, g_log will detect
1074 * the "recursion" and abort.
1077 capture_loop_stop();
1083 report_capture_count(gboolean reportit)
1085 /* Don't print this if we're a capture child. */
1086 if (!capture_child && reportit) {
1087 fprintf(stderr, "\rPackets captured: %d\n", global_ld.packet_count);
1088 /* stderr could be line buffered */
1096 report_counts_for_siginfo(void)
1098 report_capture_count(quiet);
1099 infoprint = FALSE; /* we just reported it */
1103 report_counts_siginfo(int signum _U_)
1105 int sav_errno = errno;
1107 /* If we've been told to delay printing, just set a flag asking
1108 that we print counts (if we're supposed to), otherwise print
1109 the count of packets captured (if we're supposed to). */
1113 report_counts_for_siginfo();
1116 #endif /* SIGINFO */
1119 exit_main(int status)
1122 /* Shutdown windows sockets */
1125 /* can be helpful for debugging */
1126 #ifdef DEBUG_DUMPCAP
1127 printf("Press any key\n");
1138 * If we were linked with libcap (not related to libpcap), make sure we have
1139 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1140 * (See comment in main() for details)
1143 relinquish_privs_except_capture(void)
1145 /* If 'started_with_special_privs' (ie: suid) then enable for
1146 * ourself the NET_ADMIN and NET_RAW capabilities and then
1147 * drop our suid privileges.
1149 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1150 * stuff we don't need (and shouldn't have).
1151 * CAP_NET_RAW: Packet capture (raw sockets).
1154 if (started_with_special_privs()) {
1155 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1156 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1158 cap_t caps = cap_init(); /* all capabilities initialized to off */
1160 print_caps("Pre drop, pre set");
1162 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1163 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1166 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1167 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1169 if (cap_set_proc(caps)) {
1170 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1172 print_caps("Pre drop, post set");
1174 relinquish_special_privs_perm();
1176 print_caps("Post drop, pre set");
1177 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1178 if (cap_set_proc(caps)) {
1179 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1181 print_caps("Post drop, post set");
1187 #endif /* HAVE_LIBCAP */
1189 /* Take care of byte order in the libpcap headers read from pipes.
1190 * (function taken from wiretap/libpcap.c) */
1192 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1195 /* Byte-swap the record header fields. */
1196 rechdr->ts_sec = GUINT32_SWAP_LE_BE(rechdr->ts_sec);
1197 rechdr->ts_usec = GUINT32_SWAP_LE_BE(rechdr->ts_usec);
1198 rechdr->incl_len = GUINT32_SWAP_LE_BE(rechdr->incl_len);
1199 rechdr->orig_len = GUINT32_SWAP_LE_BE(rechdr->orig_len);
1202 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1203 swapped, in order to match the BPF header layout.
1205 Unfortunately, some files were, according to a comment in the "libpcap"
1206 source, written with version 2.3 in their headers but without the
1207 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1208 would make no sense - we assume that we need to swap them. */
1209 if (hdr->version_major == 2 &&
1210 (hdr->version_minor < 3 ||
1211 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1214 temp = rechdr->orig_len;
1215 rechdr->orig_len = rechdr->incl_len;
1216 rechdr->incl_len = temp;
1220 /* Wrapper: distinguish between recv/read if we're reading on Windows,
1224 cap_pipe_read(int pipe_fd, char *buf, size_t sz, gboolean from_socket _U_)
1228 return recv(pipe_fd, buf, (int)sz, 0);
1233 return ws_read(pipe_fd, buf, sz);
1239 * Thread function that reads from a pipe and pushes the data
1240 * to the main application thread.
1243 * XXX Right now we use async queues for basic signaling. The main thread
1244 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1245 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1246 * Iff the read is successful cap_pipe_read pushes an item onto
1247 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1248 * the queues themselves (yet).
1250 * We might want to move some of the cap_pipe_dispatch logic here so that
1251 * we can let cap_thread_read run independently, queuing up multiple reads
1252 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1254 static void *cap_thread_read(void *arg)
1256 pcap_options *pcap_opts;
1259 DWORD b, last_err, bytes_read;
1265 pcap_opts = (pcap_options *)arg;
1266 while (pcap_opts->cap_pipe_err == PIPOK) {
1267 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1268 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1270 while (bytes_read < pcap_opts->cap_pipe_bytes_to_read) {
1271 if ((pcap_opts->from_cap_socket)
1277 b = cap_pipe_read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1278 pcap_opts->cap_pipe_bytes_to_read - bytes_read, pcap_opts->from_cap_socket);
1281 pcap_opts->cap_pipe_err = PIPEOF;
1285 pcap_opts->cap_pipe_err = PIPERR;
1296 /* If we try to use read() on a named pipe on Windows with partial
1297 * data it appears to return EOF.
1299 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1300 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1305 last_err = GetLastError();
1306 if (last_err == ERROR_MORE_DATA) {
1308 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1309 pcap_opts->cap_pipe_err = PIPEOF;
1313 pcap_opts->cap_pipe_err = PIPERR;
1316 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1317 pcap_opts->cap_pipe_err = PIPEOF;
1324 pcap_opts->cap_pipe_bytes_read = bytes_read;
1325 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1326 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1328 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1334 /* Provide select() functionality for a single file descriptor
1335 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1337 * Returns the same values as select.
1340 cap_pipe_select(int pipe_fd)
1343 struct timeval timeout;
1346 FD_SET(pipe_fd, &rfds);
1348 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1349 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1351 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1354 #define DEF_TCP_PORT 19000
1357 cap_open_socket(char *pipename, pcap_options *pcap_opts, char *errmsg, int errmsgl)
1359 char *sockname = pipename + 4;
1360 struct sockaddr_in sa;
1367 memset(&sa, 0, sizeof(sa));
1369 p = strchr(sockname, ':');
1371 len = strlen(sockname);
1372 port = DEF_TCP_PORT;
1376 port = strtoul(p + 1, &p, 10);
1377 if (*p || port > 65535) {
1386 g_snprintf ( buf,(gulong)len + 1, "%s", sockname );
1388 if (!ws_inet_pton4(buf, (guint32 *)&sa.sin_addr)) {
1392 sa.sin_family = AF_INET;
1393 sa.sin_port = g_htons((u_short)port);
1395 if (((fd = (int)socket(AF_INET, SOCK_STREAM, 0)) < 0) ||
1396 (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) < 0)) {
1398 LPTSTR errorText = NULL;
1401 lastError = WSAGetLastError();
1402 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
1403 FORMAT_MESSAGE_ALLOCATE_BUFFER |
1404 FORMAT_MESSAGE_IGNORE_INSERTS,
1405 NULL, lastError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
1406 (LPTSTR)&errorText, 0, NULL);
1408 g_snprintf(errmsg, errmsgl,
1409 "The capture session could not be initiated due to the socket error: \n"
1411 " %d: %S", lastError, errorText ? (char *)errorText : "Unknown");
1413 LocalFree(errorText);
1415 " %d: %s", errno, g_strerror(errno));
1417 pcap_opts->cap_pipe_err = PIPERR;
1420 cap_pipe_close(fd, TRUE);
1424 pcap_opts->from_cap_socket = TRUE;
1428 g_snprintf(errmsg, errmsgl,
1429 "The capture session could not be initiated because\n"
1430 "\"%s\" is not a valid socket specification", pipename);
1431 pcap_opts->cap_pipe_err = PIPERR;
1435 /* Wrapper: distinguish between closesocket on Windows; use ws_close
1439 cap_pipe_close(int pipe_fd, gboolean from_socket _U_)
1443 closesocket(pipe_fd);
1450 /* Mimic pcap_open_live() for pipe captures
1452 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1453 * open it, and read the header.
1455 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1456 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1458 cap_pipe_open_live(char *pipename,
1459 pcap_options *pcap_opts,
1460 struct pcap_hdr *hdr,
1461 char *errmsg, int errmsgl)
1464 ws_statb64 pipe_stat;
1465 struct sockaddr_un sa;
1470 char* extcap_pipe_name;
1474 gboolean extcap_pipe = FALSE;
1476 interface_options interface_opts;
1478 int fd = -1, sel_ret;
1481 pcap_opts->cap_pipe_fd = -1;
1483 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1486 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1489 * XXX - this blocks until a pcap per-file header has been written to
1490 * the pipe, so it could block indefinitely.
1492 if (strcmp(pipename, "-") == 0) {
1494 fd = 0; /* read from stdin */
1496 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1498 } else if (!strncmp(pipename, "TCP@", 4)) {
1499 if ((fd = cap_open_socket(pipename, pcap_opts, errmsg, errmsgl)) < 0) {
1504 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, 0);
1508 if ( g_strrstr(interface_opts.name, EXTCAP_PIPE_PREFIX) != NULL )
1512 if (ws_stat64(pipename, &pipe_stat) < 0) {
1513 if (errno == ENOENT || errno == ENOTDIR)
1514 pcap_opts->cap_pipe_err = PIPNEXIST;
1516 g_snprintf(errmsg, errmsgl,
1517 "The capture session could not be initiated "
1518 "due to error getting information on pipe/socket: %s.", g_strerror(errno));
1519 pcap_opts->cap_pipe_err = PIPERR;
1523 if (S_ISFIFO(pipe_stat.st_mode)) {
1524 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1526 g_snprintf(errmsg, errmsgl,
1527 "The capture session could not be initiated "
1528 "due to error on pipe open: %s.", g_strerror(errno));
1529 pcap_opts->cap_pipe_err = PIPERR;
1532 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1533 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1535 g_snprintf(errmsg, errmsgl,
1536 "The capture session could not be initiated "
1537 "due to error on socket create: %s.", g_strerror(errno));
1538 pcap_opts->cap_pipe_err = PIPERR;
1541 sa.sun_family = AF_UNIX;
1543 * The Single UNIX Specification says:
1545 * The size of sun_path has intentionally been left undefined.
1546 * This is because different implementations use different sizes.
1547 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1548 * of 104. Since most implementations originate from BSD versions,
1549 * the size is typically in the range 92 to 108.
1551 * Applications should not assume a particular length for sun_path
1552 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1556 * The <sys/un.h> header shall define the sockaddr_un structure,
1557 * which shall include at least the following members:
1559 * sa_family_t sun_family Address family.
1560 * char sun_path[] Socket pathname.
1562 * so we assume that it's an array, with a specified size,
1563 * and that the size reflects the maximum path length.
1565 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1566 /* Path name too long */
1567 g_snprintf(errmsg, errmsgl,
1568 "The capture session coud not be initiated "
1569 "due to error on socket connect: Path name too long.");
1570 pcap_opts->cap_pipe_err = PIPERR;
1574 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1576 g_snprintf(errmsg, errmsgl,
1577 "The capture session coud not be initiated "
1578 "due to error on socket connect: %s.", g_strerror(errno));
1579 pcap_opts->cap_pipe_err = PIPERR;
1584 if (S_ISCHR(pipe_stat.st_mode)) {
1586 * Assume the user specified an interface on a system where
1587 * interfaces are in /dev. Pretend we haven't seen it.
1589 pcap_opts->cap_pipe_err = PIPNEXIST;
1591 g_snprintf(errmsg, errmsgl,
1592 "The capture session could not be initiated because\n"
1593 "\"%s\" is neither an interface nor a socket nor a pipe.", pipename);
1594 pcap_opts->cap_pipe_err = PIPERR;
1600 #define PIPE_STR "\\pipe\\"
1601 /* Under Windows, named pipes _must_ have the form
1602 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1604 pncopy = g_strdup(pipename);
1605 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1606 pos = strchr(pncopy + 3, '\\');
1607 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1614 g_snprintf(errmsg, errmsgl,
1615 "The capture session could not be initiated because\n"
1616 "\"%s\" is neither an interface nor a pipe.", pipename);
1617 pcap_opts->cap_pipe_err = PIPNEXIST;
1621 extcap_pipe_name = g_strconcat("\\\\.\\pipe\\", EXTCAP_PIPE_PREFIX, NULL);
1622 extcap_pipe = strstr(interface_opts.name, extcap_pipe_name) ? TRUE : FALSE;
1623 g_free(extcap_pipe_name);
1626 /* Wait for the pipe to appear */
1631 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1634 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1635 OPEN_EXISTING, 0, NULL);
1637 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1640 if (GetLastError() != ERROR_PIPE_BUSY) {
1641 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
1642 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1643 g_snprintf(errmsg, errmsgl,
1644 "The capture session on \"%s\" could not be started "
1645 "due to error on pipe open: %s (error %d).",
1646 pipename, utf_16to8(err_str), GetLastError());
1648 pcap_opts->cap_pipe_err = PIPERR;
1652 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1653 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
1654 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1655 g_snprintf(errmsg, errmsgl,
1656 "The capture session on \"%s\" timed out during "
1657 "pipe open: %s (error %d).",
1658 pipename, utf_16to8(err_str), GetLastError());
1660 pcap_opts->cap_pipe_err = PIPERR;
1667 pcap_opts->from_cap_pipe = TRUE;
1670 if (pcap_opts->from_cap_socket)
1673 /* read the pcap header */
1675 while (bytes_read < sizeof magic) {
1677 g_snprintf(errmsg, errmsgl, "Invalid file descriptor.");
1681 sel_ret = cap_pipe_select(fd);
1683 g_snprintf(errmsg, errmsgl,
1684 "Unexpected error from select: %s.", g_strerror(errno));
1686 } else if (sel_ret > 0) {
1687 b = cap_pipe_read(fd, ((char *)&magic)+bytes_read,
1688 sizeof magic-bytes_read,
1689 pcap_opts->from_cap_socket);
1691 /* jump messaging, if extcap had an error, stderr will provide the correct message */
1692 if (extcap_pipe && b <= 0)
1697 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open.");
1699 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s.",
1709 #if GLIB_CHECK_VERSION(2,31,0)
1710 g_thread_new("cap_pipe_open_live", &cap_thread_read, pcap_opts);
1712 g_thread_create(&cap_thread_read, pcap_opts, FALSE, NULL);
1715 pcap_opts->cap_pipe_buf = (char *) &magic;
1716 pcap_opts->cap_pipe_bytes_read = 0;
1717 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1718 /* We don't have to worry about cap_pipe_read_mtx here */
1719 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1720 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1721 /* jump messaging, if extcap had an error, stderr will provide the correct message */
1722 if (pcap_opts->cap_pipe_bytes_read <= 0 && extcap_pipe)
1725 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1726 if (pcap_opts->cap_pipe_bytes_read == 0)
1727 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open.");
1729 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s.",
1738 case PCAP_NSEC_MAGIC:
1739 /* Host that wrote it has our byte order, and was running
1740 a program using either standard or ss990417 libpcap. */
1741 pcap_opts->cap_pipe_byte_swapped = FALSE;
1742 pcap_opts->cap_pipe_modified = FALSE;
1743 pcap_opts->ts_nsec = magic == PCAP_NSEC_MAGIC;
1745 case PCAP_MODIFIED_MAGIC:
1746 /* Host that wrote it has our byte order, but was running
1747 a program using either ss990915 or ss991029 libpcap. */
1748 pcap_opts->cap_pipe_byte_swapped = FALSE;
1749 pcap_opts->cap_pipe_modified = TRUE;
1751 case PCAP_SWAPPED_MAGIC:
1752 case PCAP_SWAPPED_NSEC_MAGIC:
1753 /* Host that wrote it has a byte order opposite to ours,
1754 and was running a program using either standard or
1755 ss990417 libpcap. */
1756 pcap_opts->cap_pipe_byte_swapped = TRUE;
1757 pcap_opts->cap_pipe_modified = FALSE;
1758 pcap_opts->ts_nsec = magic == PCAP_SWAPPED_NSEC_MAGIC;
1760 case PCAP_SWAPPED_MODIFIED_MAGIC:
1761 /* Host that wrote it out has a byte order opposite to
1762 ours, and was running a program using either ss990915
1763 or ss991029 libpcap. */
1764 pcap_opts->cap_pipe_byte_swapped = TRUE;
1765 pcap_opts->cap_pipe_modified = TRUE;
1767 case BLOCK_TYPE_SHB:
1768 /* This isn't pcap, it's pcapng. We don't yet support
1770 g_snprintf(errmsg, errmsgl, "Capturing from a pipe doesn't support pcapng format.");
1773 /* Not a pcap type we know about, or not pcap at all. */
1774 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format or not libpcap data.");
1779 if (pcap_opts->from_cap_socket)
1782 /* Read the rest of the header */
1784 while (bytes_read < sizeof(struct pcap_hdr)) {
1785 sel_ret = cap_pipe_select(fd);
1787 g_snprintf(errmsg, errmsgl,
1788 "Unexpected error from select: %s.", g_strerror(errno));
1790 } else if (sel_ret > 0) {
1791 b = cap_pipe_read(fd, ((char *)hdr)+bytes_read,
1792 sizeof(struct pcap_hdr) - bytes_read,
1793 pcap_opts->from_cap_socket);
1796 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open.");
1798 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s.",
1808 pcap_opts->cap_pipe_buf = (char *) hdr;
1809 pcap_opts->cap_pipe_bytes_read = 0;
1810 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1811 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1812 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1813 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1814 if (pcap_opts->cap_pipe_bytes_read == 0)
1815 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open.");
1817 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s.",
1824 if (pcap_opts->cap_pipe_byte_swapped) {
1825 /* Byte-swap the header fields about which we care. */
1826 hdr->version_major = GUINT16_SWAP_LE_BE(hdr->version_major);
1827 hdr->version_minor = GUINT16_SWAP_LE_BE(hdr->version_minor);
1828 hdr->snaplen = GUINT32_SWAP_LE_BE(hdr->snaplen);
1829 hdr->network = GUINT32_SWAP_LE_BE(hdr->network);
1831 pcap_opts->linktype = hdr->network;
1833 if (hdr->version_major < 2) {
1834 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1838 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1839 pcap_opts->cap_pipe_err = PIPOK;
1840 pcap_opts->cap_pipe_fd = fd;
1844 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1845 pcap_opts->cap_pipe_err = PIPERR;
1846 cap_pipe_close(fd, pcap_opts->from_cap_socket);
1847 pcap_opts->cap_pipe_fd = -1;
1851 /* We read one record from the pipe, take care of byte order in the record
1852 * header, write the record to the capture file, and update capture statistics. */
1854 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
1856 struct pcap_pkthdr phdr;
1857 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1860 #if !GLIB_CHECK_VERSION(2,31,18)
1868 #ifdef LOG_CAPTURE_VERBOSE
1869 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
1872 switch (pcap_opts->cap_pipe_state) {
1874 case STATE_EXPECT_REC_HDR:
1876 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
1879 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
1880 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
1881 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
1882 pcap_opts->cap_pipe_bytes_read = 0;
1885 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
1886 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1887 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1892 case STATE_READ_REC_HDR:
1894 if (pcap_opts->from_cap_socket)
1897 b = cap_pipe_read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
1898 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read, pcap_opts->from_cap_socket);
1901 result = PD_PIPE_EOF;
1903 result = PD_PIPE_ERR;
1906 pcap_opts->cap_pipe_bytes_read += b;
1910 #if GLIB_CHECK_VERSION(2,31,18)
1911 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
1913 g_get_current_time(&wait_time);
1914 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
1915 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
1917 if (pcap_opts->cap_pipe_err == PIPEOF) {
1918 result = PD_PIPE_EOF;
1920 } else if (pcap_opts->cap_pipe_err == PIPERR) {
1921 result = PD_PIPE_ERR;
1929 if (pcap_opts->cap_pipe_bytes_read < pcap_opts->cap_pipe_bytes_to_read)
1931 result = PD_REC_HDR_READ;
1934 case STATE_EXPECT_DATA:
1936 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
1939 pcap_opts->cap_pipe_state = STATE_READ_DATA;
1940 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
1941 pcap_opts->cap_pipe_bytes_read = 0;
1944 pcap_opts->cap_pipe_buf = (char *) data;
1945 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1946 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1951 case STATE_READ_DATA:
1953 if (pcap_opts->from_cap_socket)
1956 b = cap_pipe_read(pcap_opts->cap_pipe_fd,
1957 data+pcap_opts->cap_pipe_bytes_read,
1958 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read,
1959 pcap_opts->from_cap_socket);
1962 result = PD_PIPE_EOF;
1964 result = PD_PIPE_ERR;
1967 pcap_opts->cap_pipe_bytes_read += b;
1972 #if GLIB_CHECK_VERSION(2,31,18)
1973 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
1975 g_get_current_time(&wait_time);
1976 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
1977 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
1978 #endif /* GLIB_CHECK_VERSION(2,31,18) */
1979 if (pcap_opts->cap_pipe_err == PIPEOF) {
1980 result = PD_PIPE_EOF;
1982 } else if (pcap_opts->cap_pipe_err == PIPERR) {
1983 result = PD_PIPE_ERR;
1991 if (pcap_opts->cap_pipe_bytes_read < pcap_opts->cap_pipe_bytes_to_read)
1993 result = PD_DATA_READ;
1997 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2000 } /* switch (pcap_opts->cap_pipe_state) */
2003 * We've now read as much data as we were expecting, so process it.
2007 case PD_REC_HDR_READ:
2008 /* We've read the header. Take care of byte order. */
2009 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2010 &pcap_opts->cap_pipe_rechdr.hdr);
2011 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2012 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2013 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2017 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2018 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2021 /* no data to read? fall through */
2024 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2025 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2026 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2027 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2028 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2031 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2033 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2035 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2039 pcap_opts->cap_pipe_err = PIPEOF;
2044 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
2045 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2046 g_snprintf(errmsg, errmsgl,
2047 "Error reading from pipe: %s (error %d)",
2048 utf_16to8(err_str), GetLastError());
2051 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2059 pcap_opts->cap_pipe_err = PIPERR;
2060 /* Return here rather than inside the switch to prevent GCC warning */
2065 /** Open the capture input file (pcap or capture pipe).
2066 * Returns TRUE if it succeeds, FALSE otherwise. */
2068 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2069 char *errmsg, size_t errmsg_len,
2070 char *secondary_errmsg, size_t secondary_errmsg_len)
2072 gchar open_err_str[PCAP_ERRBUF_SIZE];
2073 gchar *sync_msg_str;
2074 interface_options interface_opts;
2075 pcap_options *pcap_opts;
2079 WORD wVersionRequested;
2083 /* XXX - opening Winsock on tshark? */
2085 /* Initialize Windows Socket if we are in a Win32 OS
2086 This needs to be done before querying the interface for network/netmask */
2088 /* XXX - do we really require 1.1 or earlier?
2089 Are there any versions that support only 2.0 or higher? */
2090 wVersionRequested = MAKEWORD(1, 1);
2091 err = WSAStartup(wVersionRequested, &wsaData);
2095 case WSASYSNOTREADY:
2096 g_snprintf(errmsg, (gulong) errmsg_len,
2097 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2100 case WSAVERNOTSUPPORTED:
2101 g_snprintf(errmsg, (gulong) errmsg_len,
2102 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2103 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2106 case WSAEINPROGRESS:
2107 g_snprintf(errmsg, (gulong) errmsg_len,
2108 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2112 g_snprintf(errmsg, (gulong) errmsg_len,
2113 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2117 g_snprintf(errmsg, (gulong) errmsg_len,
2118 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2122 g_snprintf(errmsg, (gulong) errmsg_len,
2123 "Couldn't initialize Windows Sockets: error %d", err);
2126 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2130 if ((use_threads == FALSE) &&
2131 (capture_opts->ifaces->len > 1)) {
2132 g_snprintf(errmsg, (gulong) errmsg_len,
2133 "Using threads is required for capturing on multiple interfaces.");
2137 for (i = 0; i < capture_opts->ifaces->len; i++) {
2138 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2139 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2140 if (pcap_opts == NULL) {
2141 g_snprintf(errmsg, (gulong) errmsg_len,
2142 "Could not allocate memory.");
2145 pcap_opts->received = 0;
2146 pcap_opts->dropped = 0;
2147 pcap_opts->flushed = 0;
2148 pcap_opts->pcap_h = NULL;
2149 #ifdef MUST_DO_SELECT
2150 pcap_opts->pcap_fd = -1;
2152 pcap_opts->pcap_err = FALSE;
2153 pcap_opts->interface_id = i;
2154 pcap_opts->tid = NULL;
2155 pcap_opts->snaplen = 0;
2156 pcap_opts->linktype = -1;
2157 pcap_opts->ts_nsec = FALSE;
2158 pcap_opts->from_cap_pipe = FALSE;
2159 pcap_opts->from_cap_socket = FALSE;
2160 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2161 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2163 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2165 pcap_opts->cap_pipe_fd = -1;
2166 pcap_opts->cap_pipe_modified = FALSE;
2167 pcap_opts->cap_pipe_byte_swapped = FALSE;
2169 pcap_opts->cap_pipe_buf = NULL;
2171 pcap_opts->cap_pipe_bytes_to_read = 0;
2172 pcap_opts->cap_pipe_bytes_read = 0;
2173 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2174 pcap_opts->cap_pipe_err = PIPOK;
2176 #if GLIB_CHECK_VERSION(2,31,0)
2177 pcap_opts->cap_pipe_read_mtx = g_malloc(sizeof(GMutex));
2178 g_mutex_init(pcap_opts->cap_pipe_read_mtx);
2180 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2182 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2183 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2185 g_array_append_val(ld->pcaps, pcap_opts);
2187 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2188 pcap_opts->pcap_h = open_capture_device(capture_opts, &interface_opts,
2189 CAP_READ_TIMEOUT, &open_err_str);
2191 if (pcap_opts->pcap_h != NULL) {
2192 /* we've opened "iface" as a network device */
2194 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
2195 /* Find out if we're getting nanosecond-precision time stamps */
2196 pcap_opts->ts_nsec = have_high_resolution_timestamp(pcap_opts->pcap_h);
2199 #if defined(HAVE_PCAP_SETSAMPLING)
2200 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2201 struct pcap_samp *samp;
2203 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2204 switch (interface_opts.sampling_method) {
2205 case CAPTURE_SAMP_BY_COUNT:
2206 samp->method = PCAP_SAMP_1_EVERY_N;
2209 case CAPTURE_SAMP_BY_TIMER:
2210 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2214 sync_msg_str = g_strdup_printf(
2215 "Unknown sampling method %d specified,\n"
2216 "continue without packet sampling",
2217 interface_opts.sampling_method);
2218 report_capture_error("Couldn't set the capture "
2219 "sampling", sync_msg_str);
2220 g_free(sync_msg_str);
2222 samp->value = interface_opts.sampling_param;
2224 report_capture_error("Couldn't set the capture sampling",
2225 "Cannot get packet sampling data structure");
2230 /* setting the data link type only works on real interfaces */
2231 if (!set_pcap_datalink(pcap_opts->pcap_h, interface_opts.linktype,
2232 interface_opts.name,
2234 secondary_errmsg, secondary_errmsg_len)) {
2237 pcap_opts->linktype = get_pcap_datalink(pcap_opts->pcap_h, interface_opts.name);
2239 /* We couldn't open "iface" as a network device. */
2240 /* Try to open it as a pipe */
2241 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2244 if (pcap_opts->cap_pipe_fd == -1) {
2246 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2248 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2250 * We tried opening as an interface, and that failed,
2251 * so we tried to open it as a pipe, but the pipe
2252 * doesn't exist. Report the error message for
2255 get_capture_device_open_failure_messages(open_err_str,
2256 interface_opts.name,
2260 secondary_errmsg_len);
2263 * Else pipe (or file) does exist and cap_pipe_open_live() has
2268 /* cap_pipe_open_live() succeeded; don't want
2269 error message from pcap_open_live() */
2270 open_err_str[0] = '\0';
2274 /* XXX - will this work for tshark? */
2275 #ifdef MUST_DO_SELECT
2276 if (!pcap_opts->from_cap_pipe) {
2277 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2278 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2280 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2285 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2286 returned a warning; print it, but keep capturing. */
2287 if (open_err_str[0] != '\0') {
2288 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2289 report_capture_error(sync_msg_str, "");
2290 g_free(sync_msg_str);
2292 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2293 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2296 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2297 /* to remove any suid privileges. */
2298 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2299 /* (euid/egid have already previously been set to ruid/rgid. */
2300 /* (See comment in main() for details) */
2302 relinquish_special_privs_perm();
2304 relinquish_all_capabilities();
2309 /* close the capture input file (pcap or capture pipe) */
2310 static void capture_loop_close_input(loop_data *ld)
2313 pcap_options *pcap_opts;
2315 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2317 for (i = 0; i < ld->pcaps->len; i++) {
2318 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2319 /* if open, close the capture pipe "input file" */
2320 if (pcap_opts->cap_pipe_fd >= 0) {
2321 g_assert(pcap_opts->from_cap_pipe);
2322 cap_pipe_close(pcap_opts->cap_pipe_fd, pcap_opts->from_cap_socket);
2323 pcap_opts->cap_pipe_fd = -1;
2326 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2327 CloseHandle(pcap_opts->cap_pipe_h);
2328 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2331 /* if open, close the pcap "input file" */
2332 if (pcap_opts->pcap_h != NULL) {
2333 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2334 pcap_close(pcap_opts->pcap_h);
2335 pcap_opts->pcap_h = NULL;
2342 /* Shut down windows sockets */
2348 /* init the capture filter */
2349 static initfilter_status_t
2350 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2351 const gchar * name, const gchar * cfilter)
2353 struct bpf_program fcode;
2355 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2357 /* capture filters only work on real interfaces */
2358 if (cfilter && !from_cap_pipe) {
2359 /* A capture filter was specified; set it up. */
2360 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2361 /* Treat this specially - our caller might try to compile this
2362 as a display filter and, if that succeeds, warn the user that
2363 the display and capture filter syntaxes are different. */
2364 return INITFILTER_BAD_FILTER;
2366 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2367 #ifdef HAVE_PCAP_FREECODE
2368 pcap_freecode(&fcode);
2370 return INITFILTER_OTHER_ERROR;
2372 #ifdef HAVE_PCAP_FREECODE
2373 pcap_freecode(&fcode);
2377 return INITFILTER_NO_ERROR;
2381 /* set up to write to the already-opened capture output file/files */
2383 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2387 pcap_options *pcap_opts;
2388 interface_options interface_opts;
2389 gboolean successful;
2391 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2393 if ((capture_opts->use_pcapng == FALSE) &&
2394 (capture_opts->ifaces->len > 1)) {
2395 g_snprintf(errmsg, errmsg_len,
2396 "Using PCAPNG is required for capturing on multiple interfaces. Use the -n option.");
2400 /* Set up to write to the capture file. */
2401 if (capture_opts->multi_files_on) {
2402 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2404 ld->pdh = ws_fdopen(ld->save_file_fd, "wb");
2405 if (ld->pdh == NULL) {
2410 if (capture_opts->use_pcapng) {
2412 GString *os_info_str;
2414 os_info_str = g_string_new("");
2415 get_os_version_info(os_info_str);
2417 appname = g_strdup_printf("Dumpcap (Wireshark) %s", get_ws_vcs_version_info());
2418 successful = pcapng_write_session_header_block(ld->pdh,
2419 (const char *)capture_opts->capture_comment, /* Comment*/
2421 os_info_str->str, /* OS*/
2423 -1, /* section_length */
2428 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2429 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2430 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2431 if (pcap_opts->from_cap_pipe) {
2432 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2434 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2436 successful = pcapng_write_interface_description_block(global_ld.pdh,
2437 NULL, /* OPT_COMMENT 1 */
2438 interface_opts.name, /* IDB_NAME 2 */
2439 interface_opts.descr, /* IDB_DESCRIPTION 3 */
2440 interface_opts.cfilter, /* IDB_FILTER 11 */
2441 os_info_str->str, /* IDB_OS 12 */
2442 pcap_opts->linktype,
2444 &(global_ld.bytes_written),
2445 0, /* IDB_IF_SPEED 8 */
2446 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
2450 g_string_free(os_info_str, TRUE);
2453 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2454 if (pcap_opts->from_cap_pipe) {
2455 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2457 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2459 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2460 pcap_opts->ts_nsec, &ld->bytes_written, &err);
2468 if (ld->pdh == NULL) {
2469 /* We couldn't set up to write to the capture file. */
2470 /* XXX - use cf_open_error_message from tshark instead? */
2475 g_snprintf(errmsg, errmsg_len,
2476 "The file to which the capture would be"
2477 " saved (\"%s\") could not be opened: Error %d.",
2478 capture_opts->save_file, err);
2480 g_snprintf(errmsg, errmsg_len,
2481 "The file to which the capture would be"
2482 " saved (\"%s\") could not be opened: %s.",
2483 capture_opts->save_file, g_strerror(err));
2495 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2499 pcap_options *pcap_opts;
2500 guint64 end_time = create_timestamp();
2502 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2504 if (capture_opts->multi_files_on) {
2505 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2507 if (capture_opts->use_pcapng) {
2508 for (i = 0; i < global_ld.pcaps->len; i++) {
2509 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2510 if (!pcap_opts->from_cap_pipe) {
2511 guint64 isb_ifrecv, isb_ifdrop;
2512 struct pcap_stat stats;
2514 if (pcap_stats(pcap_opts->pcap_h, &stats) >= 0) {
2515 isb_ifrecv = pcap_opts->received;
2516 isb_ifdrop = stats.ps_drop + pcap_opts->dropped + pcap_opts->flushed;
2518 isb_ifrecv = G_MAXUINT64;
2519 isb_ifdrop = G_MAXUINT64;
2521 pcapng_write_interface_statistics_block(ld->pdh,
2524 "Counters provided by dumpcap",
2533 if (fclose(ld->pdh) == EOF) {
2534 if (err_close != NULL) {
2544 /* dispatch incoming packets (pcap or capture pipe)
2546 * Waits for incoming packets to be available, and calls pcap_dispatch()
2547 * to cause them to be processed.
2549 * Returns the number of packets which were processed.
2551 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2552 * packet-batching behaviour does not cause packets to get held back
2556 capture_loop_dispatch(loop_data *ld,
2557 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2560 gint packet_count_before;
2561 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2566 packet_count_before = ld->packet_count;
2567 if (pcap_opts->from_cap_pipe) {
2568 /* dispatch from capture pipe */
2569 #ifdef LOG_CAPTURE_VERBOSE
2570 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2573 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2575 if (sel_ret < 0 && errno != EINTR) {
2576 g_snprintf(errmsg, errmsg_len,
2577 "Unexpected error from select: %s", g_strerror(errno));
2578 report_capture_error(errmsg, please_report);
2583 * "select()" says we can read from the pipe without blocking
2586 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2596 /* dispatch from pcap */
2597 #ifdef MUST_DO_SELECT
2599 * If we have "pcap_get_selectable_fd()", we use it to get the
2600 * descriptor on which to select; if that's -1, it means there
2601 * is no descriptor on which you can do a "select()" (perhaps
2602 * because you're capturing on a special device, and that device's
2603 * driver unfortunately doesn't support "select()", in which case
2604 * we don't do the select - which means it might not be possible
2605 * to stop a capture until a packet arrives. If that's unacceptable,
2606 * plead with whoever supplies the software for that device to add
2607 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2608 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2609 * later, so it can use pcap_breakloop().
2611 #ifdef LOG_CAPTURE_VERBOSE
2612 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2614 if (pcap_opts->pcap_fd != -1) {
2615 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2618 * "select()" says we can read from it without blocking; go for
2621 * We don't have pcap_breakloop(), so we only process one packet
2622 * per pcap_dispatch() call, to allow a signal to stop the
2623 * processing immediately, rather than processing all packets
2624 * in a batch before quitting.
2627 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2629 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2633 /* Error, rather than pcap_breakloop(). */
2634 pcap_opts->pcap_err = TRUE;
2636 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2639 if (sel_ret < 0 && errno != EINTR) {
2640 g_snprintf(errmsg, errmsg_len,
2641 "Unexpected error from select: %s", g_strerror(errno));
2642 report_capture_error(errmsg, please_report);
2648 #endif /* MUST_DO_SELECT */
2650 /* dispatch from pcap without select */
2652 #ifdef LOG_CAPTURE_VERBOSE
2653 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2657 * On Windows, we don't support asynchronously telling a process to
2658 * stop capturing; instead, we check for an indication on a pipe
2659 * after processing packets. We therefore process only one packet
2660 * at a time, so that we can check the pipe after every packet.
2663 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2665 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2669 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2671 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2676 /* Error, rather than pcap_breakloop(). */
2677 pcap_opts->pcap_err = TRUE;
2679 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2681 #else /* pcap_next_ex */
2682 #ifdef LOG_CAPTURE_VERBOSE
2683 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2685 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2688 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2689 * see https://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2690 * This should be fixed in the WinPcap 4.0 alpha release.
2692 * For reference, an example remote interface:
2693 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2696 /* emulate dispatch from pcap */
2699 struct pcap_pkthdr *pkt_header;
2704 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2706 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2708 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2713 pcap_opts->pcap_err = TRUE;
2717 #endif /* pcap_next_ex */
2721 #ifdef LOG_CAPTURE_VERBOSE
2722 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2725 return ld->packet_count - packet_count_before;
2729 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2730 * want to grab only the characters between the '{' and '}' delimiters.
2732 * Returns a GString that must be freed with g_string_free(). */
2734 isolate_uuid(const char *iface)
2739 ptr = strchr(iface, '{');
2741 return g_string_new(iface);
2742 gstr = g_string_new(ptr + 1);
2744 ptr = strchr(gstr->str, '}');
2748 gstr = g_string_truncate(gstr, ptr - gstr->str);
2753 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2754 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2756 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2757 char *errmsg, int errmsg_len)
2760 gchar *capfile_name;
2761 gchar *prefix, *suffix;
2762 gboolean is_tempfile;
2764 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2765 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2767 if (capture_opts->save_file != NULL) {
2768 /* We return to the caller while the capture is in progress.
2769 * Therefore we need to take a copy of save_file in
2770 * case the caller destroys it after we return.
2772 capfile_name = g_strdup(capture_opts->save_file);
2774 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2775 if (capture_opts->multi_files_on) {
2776 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2777 g_snprintf(errmsg, errmsg_len,
2778 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2779 g_free(capfile_name);
2782 if (strcmp(capfile_name, "-") == 0) {
2783 /* write to stdout */
2786 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2787 _setmode(1, O_BINARY);
2790 } /* if (...output_to_pipe ... */
2793 if (capture_opts->multi_files_on) {
2794 /* ringbuffer is enabled */
2795 *save_file_fd = ringbuf_init(capfile_name,
2796 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2797 capture_opts->group_read_access);
2799 /* we need the ringbuf name */
2800 if (*save_file_fd != -1) {
2801 g_free(capfile_name);
2802 capfile_name = g_strdup(ringbuf_current_filename());
2805 /* Try to open/create the specified file for use as a capture buffer. */
2806 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2807 (capture_opts->group_read_access) ? 0640 : 0600);
2810 is_tempfile = FALSE;
2812 /* Choose a random name for the temporary capture buffer */
2813 if (global_capture_opts.ifaces->len > 1) {
2814 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
2815 if (capture_opts->use_pcapng) {
2822 basename = g_path_get_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).console_display_name);
2824 /* use the generic portion of the interface guid to form the basis of the filename */
2825 if (strncmp("NPF_{", basename, 5)==0)
2827 /* we have a windows guid style device name, extract the guid digits as the basis of the filename */
2829 iface = isolate_uuid(basename);
2831 basename = g_strdup(iface->str);
2832 g_string_free(iface, TRUE);
2835 /* generate the temp file name prefix and suffix */
2836 if (capture_opts->use_pcapng) {
2837 prefix = g_strconcat("wireshark_", basename, NULL);
2840 prefix = g_strconcat("wireshark_", basename, NULL);
2845 *save_file_fd = create_tempfile(&tmpname, prefix, suffix);
2847 capfile_name = g_strdup(tmpname);
2851 /* did we fail to open the output file? */
2852 if (*save_file_fd == -1) {
2854 g_snprintf(errmsg, errmsg_len,
2855 "The temporary file to which the capture would be saved (\"%s\") "
2856 "could not be opened: %s.", capfile_name, g_strerror(errno));
2858 if (capture_opts->multi_files_on) {
2859 ringbuf_error_cleanup();
2862 g_snprintf(errmsg, errmsg_len,
2863 "The file to which the capture would be saved (\"%s\") "
2864 "could not be opened: %s.", capfile_name,
2867 g_free(capfile_name);
2871 if (capture_opts->save_file != NULL) {
2872 g_free(capture_opts->save_file);
2874 capture_opts->save_file = capfile_name;
2875 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2876 "g_free(capfile_name)". */
2882 /* Do the work of handling either the file size or file duration capture
2883 conditions being reached, and switching files or stopping. */
2885 do_file_switch_or_stop(capture_options *capture_opts,
2886 condition *cnd_autostop_files,
2887 condition *cnd_autostop_size,
2888 condition *cnd_file_duration)
2891 pcap_options *pcap_opts;
2892 interface_options interface_opts;
2893 gboolean successful;
2895 if (capture_opts->multi_files_on) {
2896 if (cnd_autostop_files != NULL &&
2897 cnd_eval(cnd_autostop_files, (guint64)++global_ld.autostop_files)) {
2898 /* no files left: stop here */
2899 global_ld.go = FALSE;
2903 /* Switch to the next ringbuffer file */
2904 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2905 &global_ld.save_file_fd, &global_ld.err)) {
2907 /* File switch succeeded: reset the conditions */
2908 global_ld.bytes_written = 0;
2909 if (capture_opts->use_pcapng) {
2911 GString *os_info_str;
2913 os_info_str = g_string_new("");
2914 get_os_version_info(os_info_str);
2916 appname = g_strdup_printf("Dumpcap (Wireshark) %s", get_ws_vcs_version_info());
2917 successful = pcapng_write_session_header_block(global_ld.pdh,
2920 os_info_str->str, /* OS */
2922 -1, /* section_length */
2923 &(global_ld.bytes_written),
2927 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2928 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2929 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2930 successful = pcapng_write_interface_description_block(global_ld.pdh,
2931 NULL, /* OPT_COMMENT 1 */
2932 interface_opts.name, /* IDB_NAME 2 */
2933 interface_opts.descr, /* IDB_DESCRIPTION 3 */
2934 interface_opts.cfilter, /* IDB_FILTER 11 */
2935 os_info_str->str, /* IDB_OS 12 */
2936 pcap_opts->linktype,
2938 &(global_ld.bytes_written),
2939 0, /* IDB_IF_SPEED 8 */
2940 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
2944 g_string_free(os_info_str, TRUE);
2947 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
2948 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
2949 pcap_opts->ts_nsec, &global_ld.bytes_written, &global_ld.err);
2952 fclose(global_ld.pdh);
2953 global_ld.pdh = NULL;
2954 global_ld.go = FALSE;
2957 if (cnd_autostop_size)
2958 cnd_reset(cnd_autostop_size);
2959 if (cnd_file_duration)
2960 cnd_reset(cnd_file_duration);
2961 fflush(global_ld.pdh);
2963 report_packet_count(global_ld.inpkts_to_sync_pipe);
2964 global_ld.inpkts_to_sync_pipe = 0;
2965 report_new_capture_file(capture_opts->save_file);
2967 /* File switch failed: stop here */
2968 global_ld.go = FALSE;
2972 /* single file, stop now */
2973 global_ld.go = FALSE;
2980 pcap_read_handler(void* arg)
2982 pcap_options *pcap_opts;
2983 char errmsg[MSG_MAX_LENGTH+1];
2985 pcap_opts = (pcap_options *)arg;
2987 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
2988 pcap_opts->interface_id);
2990 while (global_ld.go) {
2991 /* dispatch incoming packets */
2992 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
2994 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
2995 pcap_opts->interface_id);
2996 g_thread_exit(NULL);
3000 /* Do the low-level work of a capture.
3001 Returns TRUE if it succeeds, FALSE otherwise. */
3003 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3006 DWORD upd_time, cur_time; /* GetTickCount() returns a "DWORD" (which is 'unsigned long') */
3008 struct timeval upd_time, cur_time;
3012 condition *cnd_file_duration = NULL;
3013 condition *cnd_autostop_files = NULL;
3014 condition *cnd_autostop_size = NULL;
3015 condition *cnd_autostop_duration = NULL;
3018 gboolean cfilter_error = FALSE;
3019 char errmsg[MSG_MAX_LENGTH+1];
3020 char secondary_errmsg[MSG_MAX_LENGTH+1];
3021 pcap_options *pcap_opts;
3022 interface_options interface_opts;
3023 guint i, error_index = 0;
3026 *secondary_errmsg = '\0';
3028 /* init the loop data */
3029 global_ld.go = TRUE;
3030 global_ld.packet_count = 0;
3032 global_ld.report_packet_count = FALSE;
3034 if (capture_opts->has_autostop_packets)
3035 global_ld.packet_max = capture_opts->autostop_packets;
3037 global_ld.packet_max = 0; /* no limit */
3038 global_ld.inpkts_to_sync_pipe = 0;
3039 global_ld.err = 0; /* no error seen yet */
3040 global_ld.pdh = NULL;
3041 global_ld.autostop_files = 0;
3042 global_ld.save_file_fd = -1;
3044 /* We haven't yet gotten the capture statistics. */
3045 *stats_known = FALSE;
3047 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3048 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3050 /* open the "input file" from network interface or capture pipe */
3051 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3052 secondary_errmsg, sizeof(secondary_errmsg))) {
3055 for (i = 0; i < capture_opts->ifaces->len; i++) {
3056 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3057 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3058 /* init the input filter from the network interface (capture pipe will do nothing) */
3060 * When remote capturing WinPCap crashes when the capture filter
3061 * is NULL. This might be a bug in WPCap. Therefore we provide an empty
3064 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3065 interface_opts.name,
3066 interface_opts.cfilter?interface_opts.cfilter:"")) {
3068 case INITFILTER_NO_ERROR:
3071 case INITFILTER_BAD_FILTER:
3072 cfilter_error = TRUE;
3074 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3077 case INITFILTER_OTHER_ERROR:
3078 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3079 pcap_geterr(pcap_opts->pcap_h));
3080 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3085 /* If we're supposed to write to a capture file, open it for output
3086 (temporary/specified name/ringbuffer) */
3087 if (capture_opts->saving_to_file) {
3088 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3089 errmsg, sizeof(errmsg))) {
3093 /* set up to write to the already-opened capture output file/files */
3094 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3099 /* XXX - capture SIGTERM and close the capture, in case we're on a
3100 Linux 2.0[.x] system and you have to explicitly close the capture
3101 stream in order to turn promiscuous mode off? We need to do that
3102 in other places as well - and I don't think that works all the
3103 time in any case, due to libpcap bugs. */
3105 /* Well, we should be able to start capturing.
3107 Sync out the capture file, so the header makes it to the file system,
3108 and send a "capture started successfully and capture file created"
3109 message to our parent so that they'll open the capture file and
3110 update its windows to indicate that we have a live capture in
3112 fflush(global_ld.pdh);
3113 report_new_capture_file(capture_opts->save_file);
3116 /* initialize capture stop (and alike) conditions */
3117 init_capture_stop_conditions();
3118 /* create stop conditions */
3119 if (capture_opts->has_autostop_filesize) {
3120 if (capture_opts->autostop_filesize > (((guint32)INT_MAX + 1) / 1000)) {
3121 capture_opts->autostop_filesize = ((guint32)INT_MAX + 1) / 1000;
3124 cnd_new(CND_CLASS_CAPTURESIZE, (guint64)capture_opts->autostop_filesize * 1000);
3126 if (capture_opts->has_autostop_duration)
3127 cnd_autostop_duration =
3128 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3130 if (capture_opts->multi_files_on) {
3131 if (capture_opts->has_file_duration)
3133 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3135 if (capture_opts->has_autostop_files)
3136 cnd_autostop_files =
3137 cnd_new(CND_CLASS_CAPTURESIZE, (guint64)capture_opts->autostop_files);
3140 /* init the time values */
3142 upd_time = GetTickCount();
3144 gettimeofday(&upd_time, NULL);
3146 start_time = create_timestamp();
3147 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running.");
3149 /* WOW, everything is prepared! */
3150 /* please fasten your seat belts, we will enter now the actual capture loop */
3152 pcap_queue = g_async_queue_new();
3153 pcap_queue_bytes = 0;
3154 pcap_queue_packets = 0;
3155 for (i = 0; i < global_ld.pcaps->len; i++) {
3156 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3157 #if GLIB_CHECK_VERSION(2,31,0)
3158 /* XXX - Add an interface name here? */
3159 pcap_opts->tid = g_thread_new("Capture read", pcap_read_handler, pcap_opts);
3161 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3165 while (global_ld.go) {
3166 /* dispatch incoming packets */
3168 pcap_queue_element *queue_element;
3169 #if GLIB_CHECK_VERSION(2,31,18)
3171 g_async_queue_lock(pcap_queue);
3172 queue_element = (pcap_queue_element *)g_async_queue_timeout_pop_unlocked(pcap_queue, WRITER_THREAD_TIMEOUT);
3174 GTimeVal write_thread_time;
3176 g_get_current_time(&write_thread_time);
3177 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3178 g_async_queue_lock(pcap_queue);
3179 queue_element = (pcap_queue_element *)g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3181 if (queue_element) {
3182 pcap_queue_bytes -= queue_element->phdr.caplen;
3183 pcap_queue_packets -= 1;
3185 g_async_queue_unlock(pcap_queue);
3186 if (queue_element) {
3187 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3188 "Dequeued a packet of length %d captured on interface %d.",
3189 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3191 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3192 &queue_element->phdr,
3194 g_free(queue_element->pd);
3195 g_free(queue_element);
3201 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3202 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3203 sizeof(errmsg), pcap_opts);
3206 /* Were we asked to print packet counts by the SIGINFO handler? */
3207 if (global_ld.report_packet_count) {
3208 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3209 plurality(global_ld.packet_count, "", "s"));
3210 global_ld.report_packet_count = FALSE;
3215 /* any news from our parent (signal pipe)? -> just stop the capture */
3216 if (!signal_pipe_check_running()) {
3217 global_ld.go = FALSE;
3222 global_ld.inpkts_to_sync_pipe += inpkts;
3224 /* check capture size condition */
3225 if (cnd_autostop_size != NULL &&
3226 cnd_eval(cnd_autostop_size, global_ld.bytes_written)) {
3227 /* Capture size limit reached, do we have another file? */
3228 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3229 cnd_autostop_size, cnd_file_duration))
3231 } /* cnd_autostop_size */
3232 if (capture_opts->output_to_pipe) {
3233 fflush(global_ld.pdh);
3237 /* Only update once every 500ms so as not to overload slow displays.
3238 * This also prevents too much context-switching between the dumpcap
3239 * and wireshark processes.
3241 #define DUMPCAP_UPD_TIME 500
3244 cur_time = GetTickCount(); /* Note: wraps to 0 if sys runs for 49.7 days */
3245 if ((cur_time - upd_time) > DUMPCAP_UPD_TIME) { /* wrap just causes an extra update */
3247 gettimeofday(&cur_time, NULL);
3248 if (((guint64)cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3249 ((guint64)upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3252 upd_time = cur_time;
3255 if (pcap_stats(pch, stats) >= 0) {
3256 *stats_known = TRUE;
3259 /* Let the parent process know. */
3260 if (global_ld.inpkts_to_sync_pipe) {
3262 fflush(global_ld.pdh);
3264 /* Send our parent a message saying we've written out
3265 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3267 report_packet_count(global_ld.inpkts_to_sync_pipe);
3269 global_ld.inpkts_to_sync_pipe = 0;
3272 /* check capture duration condition */
3273 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3274 /* The maximum capture time has elapsed; stop the capture. */
3275 global_ld.go = FALSE;
3279 /* check capture file duration condition */
3280 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3281 /* duration limit reached, do we have another file? */
3282 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3283 cnd_autostop_size, cnd_file_duration))
3285 } /* cnd_file_duration */
3289 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3291 pcap_queue_element *queue_element;
3293 for (i = 0; i < global_ld.pcaps->len; i++) {
3294 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3295 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3296 pcap_opts->interface_id);
3297 g_thread_join(pcap_opts->tid);
3298 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3299 pcap_opts->interface_id);
3302 g_async_queue_lock(pcap_queue);
3303 queue_element = (pcap_queue_element *)g_async_queue_try_pop_unlocked(pcap_queue);
3304 if (queue_element) {
3305 pcap_queue_bytes -= queue_element->phdr.caplen;
3306 pcap_queue_packets -= 1;
3308 g_async_queue_unlock(pcap_queue);
3309 if (queue_element == NULL) {
3312 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3313 "Dequeued a packet of length %d captured on interface %d.",
3314 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3315 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3316 &queue_element->phdr,
3318 g_free(queue_element->pd);
3319 g_free(queue_element);
3320 global_ld.inpkts_to_sync_pipe += 1;
3321 if (capture_opts->output_to_pipe) {
3322 fflush(global_ld.pdh);
3328 /* delete stop conditions */
3329 if (cnd_file_duration != NULL)
3330 cnd_delete(cnd_file_duration);
3331 if (cnd_autostop_files != NULL)
3332 cnd_delete(cnd_autostop_files);
3333 if (cnd_autostop_size != NULL)
3334 cnd_delete(cnd_autostop_size);
3335 if (cnd_autostop_duration != NULL)
3336 cnd_delete(cnd_autostop_duration);
3338 /* did we have a pcap (input) error? */
3339 for (i = 0; i < capture_opts->ifaces->len; i++) {
3340 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3341 if (pcap_opts->pcap_err) {
3342 /* On Linux, if an interface goes down while you're capturing on it,
3343 you'll get a "recvfrom: Network is down" or
3344 "The interface went down" error (ENETDOWN).
3345 (At least you will if g_strerror() doesn't show a local translation
3348 On FreeBSD and OS X, if a network adapter disappears while
3349 you're capturing on it, you'll get a "read: Device not configured"
3350 error (ENXIO). (See previous parenthetical note.)
3352 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3354 These should *not* be reported to the Wireshark developers. */
3357 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3358 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3359 strcmp(cap_err_str, "The interface went down") == 0 ||
3360 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3361 strcmp(cap_err_str, "read: I/O error") == 0 ||
3362 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3363 report_capture_error("The network adapter on which the capture was being done "
3364 "is no longer running; the capture has stopped.",
3367 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3369 report_capture_error(errmsg, please_report);
3372 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3373 report_capture_error(errmsg, "");
3377 /* did we have an output error while capturing? */
3378 if (global_ld.err == 0) {
3381 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3382 global_ld.err, FALSE);
3383 report_capture_error(errmsg, please_report);
3387 if (capture_opts->saving_to_file) {
3388 /* close the output file */
3389 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3393 /* there might be packets not yet notified to the parent */
3394 /* (do this after closing the file, so all packets are already flushed) */
3395 if (global_ld.inpkts_to_sync_pipe) {
3397 report_packet_count(global_ld.inpkts_to_sync_pipe);
3398 global_ld.inpkts_to_sync_pipe = 0;
3401 /* If we've displayed a message about a write error, there's no point
3402 in displaying another message about an error on close. */
3403 if (!close_ok && write_ok) {
3404 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3406 report_capture_error(errmsg, "");
3410 * XXX We exhibit different behaviour between normal mode and sync mode
3411 * when the pipe is stdin and not already at EOF. If we're a child, the
3412 * parent's stdin isn't closed, so if the user starts another capture,
3413 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3414 * will say "Unrecognized libpcap format". On the other hand, in normal
3415 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3418 report_capture_count(TRUE);
3420 /* get packet drop statistics from pcap */
3421 for (i = 0; i < capture_opts->ifaces->len; i++) {
3423 guint32 pcap_dropped = 0;
3425 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3426 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3427 received = pcap_opts->received;
3428 if (pcap_opts->pcap_h != NULL) {
3429 g_assert(!pcap_opts->from_cap_pipe);
3430 /* Get the capture statistics, so we know how many packets were dropped. */
3432 * Older versions of libpcap didn't set ps_ifdrop on some
3433 * platforms; initialize it to 0 to handle that.
3435 stats->ps_ifdrop = 0;
3436 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3437 *stats_known = TRUE;
3438 /* Let the parent process know. */
3439 pcap_dropped += stats->ps_drop;
3441 g_snprintf(errmsg, sizeof(errmsg),
3442 "Can't get packet-drop statistics: %s",
3443 pcap_geterr(pcap_opts->pcap_h));
3444 report_capture_error(errmsg, please_report);
3447 report_packet_drops(received, pcap_dropped, pcap_opts->dropped, pcap_opts->flushed, stats->ps_ifdrop, interface_opts.console_display_name);
3450 /* close the input file (pcap or capture pipe) */
3451 capture_loop_close_input(&global_ld);
3453 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped.");
3455 /* ok, if the write and the close were successful. */
3456 return write_ok && close_ok;
3459 if (capture_opts->multi_files_on) {
3460 /* cleanup ringbuffer */
3461 ringbuf_error_cleanup();
3463 /* We can't use the save file, and we have no FILE * for the stream
3464 to close in order to close it, so close the FD directly. */
3465 if (global_ld.save_file_fd != -1) {
3466 ws_close(global_ld.save_file_fd);
3469 /* We couldn't even start the capture, so get rid of the capture
3471 if (capture_opts->save_file != NULL) {
3472 ws_unlink(capture_opts->save_file);
3473 g_free(capture_opts->save_file);
3476 capture_opts->save_file = NULL;
3478 report_cfilter_error(capture_opts, error_index, errmsg);
3480 report_capture_error(errmsg, secondary_errmsg);
3482 /* close the input file (pcap or cap_pipe) */
3483 capture_loop_close_input(&global_ld);
3485 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3492 capture_loop_stop(void)
3494 #ifdef HAVE_PCAP_BREAKLOOP
3496 pcap_options *pcap_opts;
3498 for (i = 0; i < global_ld.pcaps->len; i++) {
3499 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3500 if (pcap_opts->pcap_h != NULL)
3501 pcap_breakloop(pcap_opts->pcap_h);
3504 global_ld.go = FALSE;
3509 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3510 int err, gboolean is_close)
3515 g_snprintf(errmsg, errmsglen,
3516 "Not all the packets could be written to the file"
3517 " to which the capture was being saved\n"
3518 "(\"%s\") because there is no space left on the file system\n"
3519 "on which that file resides.",
3525 g_snprintf(errmsg, errmsglen,
3526 "Not all the packets could be written to the file"
3527 " to which the capture was being saved\n"
3528 "(\"%s\") because you are too close to, or over,"
3529 " your disk quota\n"
3530 "on the file system on which that file resides.",
3537 g_snprintf(errmsg, errmsglen,
3538 "The file to which the capture was being saved\n"
3539 "(\"%s\") could not be closed: %s.",
3540 fname, g_strerror(err));
3542 g_snprintf(errmsg, errmsglen,
3543 "An error occurred while writing to the file"
3544 " to which the capture was being saved\n"
3546 fname, g_strerror(err));
3553 /* one packet was captured, process it */
3555 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3558 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3560 guint ts_mul = pcap_opts->ts_nsec ? 1000000000 : 1000000;
3562 /* We may be called multiple times from pcap_dispatch(); if we've set
3563 the "stop capturing" flag, ignore this packet, as we're not
3564 supposed to be saving any more packets. */
3565 if (!global_ld.go) {
3566 pcap_opts->flushed++;
3570 if (global_ld.pdh) {
3571 gboolean successful;
3573 /* We're supposed to write the packet to a file; do so.
3574 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3575 "ld->err" to the error. */
3576 if (global_capture_opts.use_pcapng) {
3577 successful = pcapng_write_enhanced_packet_block(global_ld.pdh,
3579 phdr->ts.tv_sec, (gint32)phdr->ts.tv_usec,
3580 phdr->caplen, phdr->len,
3581 pcap_opts->interface_id,
3584 &global_ld.bytes_written, &err);
3586 successful = libpcap_write_packet(global_ld.pdh,
3587 phdr->ts.tv_sec, (gint32)phdr->ts.tv_usec,
3588 phdr->caplen, phdr->len,
3590 &global_ld.bytes_written, &err);
3593 global_ld.go = FALSE;
3594 global_ld.err = err;
3595 pcap_opts->dropped++;
3597 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
3598 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3599 "Wrote a packet of length %d captured on interface %u.",
3600 phdr->caplen, pcap_opts->interface_id);
3602 global_ld.packet_count++;
3603 pcap_opts->received++;
3604 /* if the user told us to stop after x packets, do we already have enough? */
3605 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3606 global_ld.go = FALSE;
3612 /* one packet was captured, queue it */
3614 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3617 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3618 pcap_queue_element *queue_element;
3619 gboolean limit_reached;
3621 /* We may be called multiple times from pcap_dispatch(); if we've set
3622 the "stop capturing" flag, ignore this packet, as we're not
3623 supposed to be saving any more packets. */
3624 if (!global_ld.go) {
3625 pcap_opts->flushed++;
3629 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3630 if (queue_element == NULL) {
3631 pcap_opts->dropped++;
3634 queue_element->pcap_opts = pcap_opts;
3635 queue_element->phdr = *phdr;
3636 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3637 if (queue_element->pd == NULL) {
3638 pcap_opts->dropped++;
3639 g_free(queue_element);
3642 memcpy(queue_element->pd, pd, phdr->caplen);
3643 g_async_queue_lock(pcap_queue);
3644 if (((pcap_queue_byte_limit == 0) || (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3645 ((pcap_queue_packet_limit == 0) || (pcap_queue_packets < pcap_queue_packet_limit))) {
3646 limit_reached = FALSE;
3647 g_async_queue_push_unlocked(pcap_queue, queue_element);
3648 pcap_queue_bytes += phdr->caplen;
3649 pcap_queue_packets += 1;
3651 limit_reached = TRUE;
3653 g_async_queue_unlock(pcap_queue);
3654 if (limit_reached) {
3655 pcap_opts->dropped++;
3656 g_free(queue_element->pd);
3657 g_free(queue_element);
3658 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3659 "Dropped a packet of length %d captured on interface %u.",
3660 phdr->caplen, pcap_opts->interface_id);
3662 pcap_opts->received++;
3663 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3664 "Queued a packet of length %d captured on interface %u.",
3665 phdr->caplen, pcap_opts->interface_id);
3667 /* I don't want to hold the mutex over the debug output. So the
3668 output may be wrong */
3669 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3670 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3671 pcap_queue_bytes, pcap_queue_packets);
3675 set_80211_channel(const char *iface, const char *opt)
3679 int center_freq1 = -1;
3680 int center_freq2 = -1;
3683 gchar **options = NULL;
3685 options = g_strsplit_set(opt, ",", 4);
3686 for (args = 0; options[args]; args++);
3689 freq = atoi(options[0]);
3691 if (args >= 1 && options[1]) {
3692 type = ws80211_str_to_chan_type(options[1]);
3699 if (args >= 2 && options[2])
3700 center_freq1 = atoi(options[2]);
3702 if (args >= 3 && options[3])
3703 center_freq2 = atoi(options[3]);
3705 ret = ws80211_init();
3707 cmdarg_err("%d: Failed to init ws80211: %s\n", abs(ret), g_strerror(abs(ret)));
3711 ret = ws80211_set_freq(iface, freq, type, center_freq1, center_freq2);
3714 cmdarg_err("%d: Failed to set channel: %s\n", abs(ret), g_strerror(abs(ret)));
3720 pipe_write_block(2, SP_SUCCESS, NULL);
3724 g_strfreev(options);
3729 get_dumpcap_compiled_info(GString *str)
3731 /* Capture libraries */
3732 g_string_append(str, ", ");
3733 get_compiled_caplibs_version(str);
3737 get_dumpcap_runtime_info(GString *str)
3739 /* Capture libraries */
3740 g_string_append(str, ", ");
3741 get_runtime_caplibs_version(str);
3744 /* And now our feature presentation... [ fade to music ] */
3746 main(int argc, char *argv[])
3748 GString *comp_info_str;
3749 GString *runtime_info_str;
3751 static const struct option long_options[] = {
3752 {"help", no_argument, NULL, 'h'},
3753 {"version", no_argument, NULL, 'v'},
3754 LONGOPT_CAPTURE_COMMON
3758 gboolean arg_error = FALSE;
3763 struct sigaction action, oldaction;
3766 gboolean start_capture = TRUE;
3767 gboolean stats_known;
3768 struct pcap_stat stats;
3769 GLogLevelFlags log_flags;
3770 gboolean list_interfaces = FALSE;
3771 gboolean list_link_layer_types = FALSE;
3772 #ifdef HAVE_BPF_IMAGE
3773 gboolean print_bpf_code = FALSE;
3775 gboolean set_chan = FALSE;
3776 gchar *set_chan_arg = NULL;
3777 gboolean machine_readable = FALSE;
3778 gboolean print_statistics = FALSE;
3779 int status, run_once_args = 0;
3782 #if defined(__APPLE__) && defined(__LP64__)
3783 struct utsname osinfo;
3787 cmdarg_err_init(dumpcap_cmdarg_err, dumpcap_cmdarg_err_cont);
3789 /* Get the compile-time version information string */
3790 comp_info_str = get_compiled_version_info(NULL, get_dumpcap_compiled_info);
3792 /* Get the run-time version information string */
3793 runtime_info_str = get_runtime_version_info(get_dumpcap_runtime_info);
3795 /* Add it to the information to be reported on a crash. */
3796 ws_add_crash_info("Dumpcap (Wireshark) %s\n"
3801 get_ws_vcs_version_info(), comp_info_str->str, runtime_info_str->str);
3804 arg_list_utf_16to8(argc, argv);
3805 create_app_running_mutex();
3808 * Initialize our DLL search path. MUST be called before LoadLibrary
3811 ws_init_dll_search_path();
3814 #ifdef HAVE_BPF_IMAGE
3815 #define OPTSTRING_d "d"
3817 #define OPTSTRING_d ""
3820 #ifdef HAVE_PCAP_REMOTE
3821 #define OPTSTRING_r "r"
3822 #define OPTSTRING_u "u"
3824 #define OPTSTRING_r ""
3825 #define OPTSTRING_u ""
3828 #ifdef HAVE_PCAP_SETSAMPLING
3829 #define OPTSTRING_m "m:"
3831 #define OPTSTRING_m ""
3834 #define OPTSTRING OPTSTRING_CAPTURE_COMMON "C:" OPTSTRING_d "gh" "k:" OPTSTRING_m "MN:nPq" OPTSTRING_r "St" OPTSTRING_u "vw:Z:"
3836 #ifdef DEBUG_CHILD_DUMPCAP
3837 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3838 fprintf (stderr, "Unable to open debug log file .\n");
3843 #if defined(__APPLE__) && defined(__LP64__)
3845 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3846 * a bug workaround - timeouts less than 1 second don't work with libpcap
3847 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3848 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3849 * The problem is extremely unlikely to be reintroduced in a future
3852 if (uname(&osinfo) == 0) {
3854 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3855 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3856 * number of 10.0.0, not 10.1.0 - go figure).
3858 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3859 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3860 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3861 need_timeout_workaround = TRUE;
3866 * Determine if dumpcap is being requested to run in a special
3867 * capture_child mode by going thru the command line args to see if
3868 * a -Z is present. (-Z is a hidden option).
3870 * The primary result of running in capture_child mode is that
3871 * all messages sent out on stderr are in a special type/len/string
3872 * format to allow message processing by type. These messages include
3873 * error messages if dumpcap fails to start the operation it was
3874 * requested to do, as well as various "status" messages which are sent
3875 * when an actual capture is in progress, and a "success" message sent
3876 * if dumpcap was requested to perform an operation other than a
3879 * Capture_child mode would normally be requested by a parent process
3880 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3881 * to which dumpcap stderr has been redirected. It might also have
3882 * another pipe to obtain dumpcap stdout output; for operations other
3883 * than a capture, that information is formatted specially for easier
3884 * parsing by the parent process.
3886 * Capture_child mode needs to be determined immediately upon
3887 * startup so that any messages generated by dumpcap in this mode
3888 * (eg: during initialization) will be formatted properly.
3891 for (i=1; i<argc; i++) {
3892 if (strcmp("-Z", argv[i]) == 0) {
3893 capture_child = TRUE;
3894 machine_readable = TRUE; /* request machine-readable output */
3896 /* set output pipe to binary mode, to avoid ugly text conversions */
3897 _setmode(2, O_BINARY);
3902 /* The default_log_handler will use stdout, which makes trouble in */
3903 /* capture child mode, as it uses stdout for its sync_pipe. */
3904 /* So: the filtering is done in the console_log_handler and not here.*/
3905 /* We set the log handlers right up front to make sure that any log */
3906 /* messages when running as child will be sent back to the parent */
3907 /* with the correct format. */
3912 G_LOG_LEVEL_CRITICAL|
3913 G_LOG_LEVEL_WARNING|
3914 G_LOG_LEVEL_MESSAGE|
3918 G_LOG_FLAG_RECURSION);
3920 g_log_set_handler(NULL,
3922 console_log_handler, NULL /* user_data */);
3923 g_log_set_handler(LOG_DOMAIN_MAIN,
3925 console_log_handler, NULL /* user_data */);
3926 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3928 console_log_handler, NULL /* user_data */);
3929 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3931 console_log_handler, NULL /* user_data */);
3933 /* Initialize the pcaps list */
3934 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
3936 #if !GLIB_CHECK_VERSION(2,31,0)
3937 /* Initialize the thread system */
3938 g_thread_init(NULL);
3942 /* Load wpcap if possible. Do this before collecting the run-time version information */
3945 /* ... and also load the packet.dll from wpcap */
3946 /* XXX - currently not required, may change later. */
3947 /*wpcap_packet_load();*/
3949 /* Start windows sockets */
3950 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3952 /* Set handler for Ctrl+C key */
3953 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3955 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3956 and exit. Do the same with SIGPIPE, in case, for example,
3957 we're writing to our standard output and it's a pipe.
3958 Do the same with SIGHUP if it's not being ignored (if we're
3959 being run under nohup, it might be ignored, in which case we
3960 should leave it ignored).
3962 XXX - apparently, Coverity complained that part of action
3963 wasn't initialized. Perhaps it's running on Linux, where
3964 struct sigaction has an ignored "sa_restorer" element and
3965 where "sa_handler" and "sa_sigaction" might not be two
3966 members of a union. */
3967 memset(&action, 0, sizeof(action));
3968 action.sa_handler = capture_cleanup_handler;
3970 * Arrange that system calls not get restarted, because when
3971 * our signal handler returns we don't want to restart
3972 * a call that was waiting for packets to arrive.
3974 action.sa_flags = 0;
3975 sigemptyset(&action.sa_mask);
3976 sigaction(SIGTERM, &action, NULL);
3977 sigaction(SIGINT, &action, NULL);
3978 sigaction(SIGPIPE, &action, NULL);
3979 sigaction(SIGHUP, NULL, &oldaction);
3980 if (oldaction.sa_handler == SIG_DFL)
3981 sigaction(SIGHUP, &action, NULL);
3984 /* Catch SIGINFO and, if we get it and we're capturing in
3985 quiet mode, report the number of packets we've captured. */
3986 action.sa_handler = report_counts_siginfo;
3987 action.sa_flags = SA_RESTART;
3988 sigemptyset(&action.sa_mask);
3989 sigaction(SIGINFO, &action, NULL);
3990 #endif /* SIGINFO */
3994 enable_kernel_bpf_jit_compiler();
3997 /* ----------------------------------------------------------------- */
3998 /* Privilege and capability handling */
4000 /* 1. Running not as root or suid root; no special capabilities. */
4003 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
4006 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
4008 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4009 /* capabilities; Drop all other capabilities; */
4010 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4011 /* else: after pcap_open_live() in capture_loop_open_input() */
4012 /* drop all capabilities (NET_RAW and NET_ADMIN); */
4013 /* (Note: this means that the process, although logged in */
4014 /* as root, does not have various permissions such as the */
4015 /* ability to bypass file access permissions). */
4016 /* XXX: Should we just leave capabilities alone in this case */
4017 /* so that user gets expected effect that root can do */
4020 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
4022 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4023 /* else: after pcap_open_live() in capture_loop_open_input() */
4024 /* drop suid root (set euid=ruid).(ie: keep suid until after */
4025 /* pcap_open_live). */
4027 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
4029 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4030 /* capabilities; Drop all other capabilities; */
4031 /* Drop suid privileges (euid=ruid); */
4032 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4033 /* else: after pcap_open_live() in capture_loop_open_input() */
4034 /* drop all capabilities (NET_RAW and NET_ADMIN). */
4036 /* XXX: For some Linux versions/distros with capabilities */
4037 /* a 'normal' process with any capabilities cannot be */
4038 /* 'killed' (signaled) from another (same uid) non-privileged */
4040 /* For example: If (non-suid) Wireshark forks a */
4041 /* child suid dumpcap which acts as described here (case 5), */
4042 /* Wireshark will be unable to kill (signal) the child */
4043 /* dumpcap process until the capabilities have been dropped */
4044 /* (after pcap_open_live()). */
4045 /* This behaviour will apparently be changed in the kernel */
4046 /* to allow the kill (signal) in this case. */
4047 /* See the following for details: */
4048 /* https://www.mail-archive.com/ [wrapped] */
4049 /* linux-security-module@vger.kernel.org/msg02913.html */
4051 /* It is therefore conceivable that if dumpcap somehow hangs */
4052 /* in pcap_open_live or before that wireshark will not */
4053 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
4054 /* In this case, exiting wireshark will kill the child */
4055 /* dumpcap process. */
4057 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
4058 /* capabilities; Using libcap. Note: capset cmd (which see) */
4059 /* used to assign capabilities to file. */
4061 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4062 /* else: after pcap_open_live() in capture_loop_open_input() */
4063 /* drop all capabilities (NET_RAW and NET_ADMIN) */
4065 /* ToDo: -S (stats) should drop privileges/capabilities when no */
4066 /* longer required (similar to capture). */
4068 /* ----------------------------------------------------------------- */
4070 init_process_policies();
4073 /* If 'started with special privileges' (and using libcap) */
4074 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
4075 /* Set euid/egid = ruid/rgid to remove suid privileges */
4076 relinquish_privs_except_capture();
4079 /* Set the initial values in the capture options. This might be overwritten
4080 by the command line parameters. */
4081 capture_opts_init(&global_capture_opts);
4082 /* We always save to a file - if no file was specified, we save to a
4084 global_capture_opts.saving_to_file = TRUE;
4085 global_capture_opts.has_ring_num_files = TRUE;
4087 /* Pass on capture_child mode for capture_opts */
4088 global_capture_opts.capture_child = capture_child;
4090 /* Now get our args */
4091 while ((opt = getopt_long(argc, argv, OPTSTRING, long_options, NULL)) != -1) {
4093 case 'h': /* Print help and exit */
4094 printf("Dumpcap (Wireshark) %s\n"
4095 "Capture network packets and dump them into a pcapng or pcap file.\n"
4096 "See https://www.wireshark.org for more information.\n",
4097 get_ws_vcs_version_info());
4098 print_usage(stdout);
4101 case 'v': /* Show version and exit */
4103 show_version("Dumpcap (Wireshark)", comp_info_str, runtime_info_str);
4104 g_string_free(comp_info_str, TRUE);
4105 g_string_free(runtime_info_str, TRUE);
4109 /*** capture option specific ***/
4110 case 'a': /* autostop criteria */
4111 case 'b': /* Ringbuffer option */
4112 case 'c': /* Capture x packets */
4113 case 'f': /* capture filter */
4114 case 'g': /* enable group read access on file(s) */
4115 case 'i': /* Use interface x */
4116 case 'n': /* Use pcapng format */
4117 case 'p': /* Don't capture in promiscuous mode */
4118 case 'P': /* Use pcap format */
4119 case 's': /* Set the snapshot (capture) length */
4120 case 'w': /* Write to capture file x */
4121 case 'y': /* Set the pcap data link type */
4122 case LONGOPT_NUM_CAP_COMMENT: /* add a capture comment */
4123 #ifdef HAVE_PCAP_REMOTE
4124 case 'u': /* Use UDP for data transfer */
4125 case 'r': /* Capture own RPCAP traffic too */
4126 case 'A': /* Authentication */
4128 #ifdef HAVE_PCAP_SETSAMPLING
4129 case 'm': /* Sampling */
4131 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
4132 case 'B': /* Buffer size */
4134 #ifdef HAVE_PCAP_CREATE
4135 case 'I': /* Monitor mode */
4137 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4142 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4144 capture_child = TRUE;
4146 /* set output pipe to binary mode, to avoid ugly text conversions */
4147 _setmode(2, O_BINARY);
4149 * optarg = the control ID, aka the PPID, currently used for the
4152 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4153 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4154 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4155 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4157 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4158 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4159 "Signal pipe: Unable to open %s. Dead parent?",
4167 case 'q': /* Quiet */
4173 /*** all non capture option specific ***/
4174 case 'D': /* Print a list of capture devices and exit */
4175 if (!list_interfaces) {
4176 list_interfaces = TRUE;
4180 case 'L': /* Print list of link-layer types and exit */
4181 if (!list_link_layer_types) {
4182 list_link_layer_types = TRUE;
4186 #ifdef HAVE_BPF_IMAGE
4187 case 'd': /* Print BPF code for capture filter and exit */
4188 if (!print_bpf_code) {
4189 print_bpf_code = TRUE;
4194 case 'S': /* Print interface statistics once a second */
4195 if (!print_statistics) {
4196 print_statistics = TRUE;
4200 case 'k': /* Set wireless channel */
4203 set_chan_arg = optarg;
4206 cmdarg_err("Only one -k flag may be specified");
4210 case 'M': /* For -D, -L, and -S, print machine-readable output */
4211 machine_readable = TRUE;
4214 pcap_queue_byte_limit = get_positive_int(optarg, "byte_limit");
4217 pcap_queue_packet_limit = get_positive_int(optarg, "packet_limit");
4220 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4222 case '?': /* Bad flag - print usage message */
4231 /* user specified file name as regular command-line argument */
4232 /* XXX - use it as the capture file name (or something else)? */
4238 * Extra command line arguments were specified; complain.
4239 * XXX - interpret as capture filter, as tcpdump and tshark do?
4241 cmdarg_err("Invalid argument: %s", argv[0]);
4246 if ((pcap_queue_byte_limit > 0) || (pcap_queue_packet_limit > 0)) {
4249 if ((pcap_queue_byte_limit == 0) && (pcap_queue_packet_limit == 0)) {
4250 /* Use some default if the user hasn't specified some */
4251 /* XXX: Are these defaults good enough? */
4252 pcap_queue_byte_limit = 1000 * 1000;
4253 pcap_queue_packet_limit = 1000;
4256 print_usage(stderr);
4260 if (run_once_args > 1) {
4261 #ifdef HAVE_BPF_IMAGE
4262 cmdarg_err("Only one of -D, -L, -d, -k, or -S may be supplied.");
4264 cmdarg_err("Only one of -D, -L, -k, or -S may be supplied.");
4267 } else if (run_once_args == 1) {
4268 /* We're supposed to print some information, rather than
4269 to capture traffic; did they specify a ring buffer option? */
4270 if (global_capture_opts.multi_files_on) {
4271 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4275 /* We're supposed to capture traffic; */
4277 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4278 if (global_capture_opts.ifaces->len > 1) {
4280 global_capture_opts.use_pcapng = TRUE;
4283 if (global_capture_opts.capture_comment &&
4284 (!global_capture_opts.use_pcapng || global_capture_opts.multi_files_on)) {
4285 /* XXX - for ringbuffer, should we apply the comment to each file? */
4286 cmdarg_err("A capture comment can only be set if we capture into a single pcapng file.");
4290 /* Was the ring buffer option specified and, if so, does it make sense? */
4291 if (global_capture_opts.multi_files_on) {
4292 /* Ring buffer works only under certain conditions:
4293 a) ring buffer does not work with temporary files;
4294 b) it makes no sense to enable the ring buffer if the maximum
4295 file size is set to "infinite". */
4296 if (global_capture_opts.save_file == NULL) {
4297 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4298 global_capture_opts.multi_files_on = FALSE;
4300 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4301 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4303 /* XXX - this must be redesigned as the conditions changed */
4304 global_capture_opts.multi_files_on = FALSE;
4311 * "-D" requires no interface to be selected; it's supposed to list
4314 if (list_interfaces) {
4315 /* Get the list of interfaces */
4320 if_list = capture_interface_list(&err, &err_str,NULL);
4321 if (if_list == NULL) {
4324 * If we're being run by another program, just give them
4325 * an empty list of interfaces, don't report this as
4326 * an error; that lets them decide whether to report
4327 * this as an error or not.
4329 if (!machine_readable) {
4330 cmdarg_err("There are no interfaces on which a capture can be done");
4334 cmdarg_err("%s", err_str);
4340 if (machine_readable) /* tab-separated values to stdout */
4341 print_machine_readable_interfaces(if_list);
4343 capture_opts_print_interfaces(if_list);
4344 free_interface_list(if_list);
4349 * "-S" requires no interface to be selected; it gives statistics
4350 * for all interfaces.
4352 if (print_statistics) {
4353 status = print_statistics_loop(machine_readable);
4358 interface_options interface_opts;
4360 if (global_capture_opts.ifaces->len != 1) {
4361 cmdarg_err("Need one interface");
4365 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, 0);
4366 status = set_80211_channel(interface_opts.name, set_chan_arg);
4371 * "-L", "-d", and capturing act on a particular interface, so we have to
4372 * have an interface; if none was specified, pick a default.
4374 status = capture_opts_default_iface_if_necessary(&global_capture_opts, NULL);
4376 /* cmdarg_err() already called .... */
4380 if (list_link_layer_types) {
4381 /* Get the list of link-layer types for the capture device. */
4382 if_capabilities_t *caps;
4386 for (ii = 0; ii < global_capture_opts.ifaces->len; ii++) {
4387 interface_options interface_opts;
4389 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, ii);
4391 caps = get_if_capabilities(&interface_opts, &err_str);
4393 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4394 "Please check to make sure you have sufficient permissions, and that\n"
4395 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4399 if (caps->data_link_types == NULL) {
4400 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4403 if (machine_readable) /* tab-separated values to stdout */
4404 /* XXX: We need to change the format and adopt consumers */
4405 print_machine_readable_if_capabilities(caps);
4407 /* XXX: We might want to print also the interface name */
4408 capture_opts_print_if_capabilities(caps, interface_opts.name,
4409 interface_opts.monitor_mode);
4410 free_if_capabilities(caps);
4415 /* We're supposed to do a capture, or print the BPF code for a filter. */
4417 /* Let the user know what interfaces were chosen. */
4418 if (capture_child) {
4419 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4420 interface_options interface_opts;
4422 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4423 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n",
4424 interface_opts.name);
4427 str = g_string_new("");
4429 if (global_capture_opts.ifaces->len < 2)
4431 if (global_capture_opts.ifaces->len < 4)
4434 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4435 interface_options interface_opts;
4437 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4439 if (global_capture_opts.ifaces->len > 2) {
4440 g_string_append_printf(str, ",");
4442 g_string_append_printf(str, " ");
4443 if (j == global_capture_opts.ifaces->len - 1) {
4444 g_string_append_printf(str, "and ");
4447 g_string_append_printf(str, "'%s'", interface_opts.console_display_name);
4450 g_string_append_printf(str, "%u interfaces", global_capture_opts.ifaces->len);
4452 fprintf(stderr, "Capturing on %s\n", str->str);
4453 g_string_free(str, TRUE);
4456 /* Process the snapshot length, as that affects the generated BPF code. */
4457 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4459 #ifdef HAVE_BPF_IMAGE
4460 if (print_bpf_code) {
4461 show_filter_code(&global_capture_opts);
4466 /* We're supposed to do a capture. Process the ring buffer arguments. */
4467 capture_opts_trim_ring_num_files(&global_capture_opts);
4469 /* flush stderr prior to starting the main capture loop */
4472 /* Now start the capture. */
4473 if (capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4477 /* capture failed */
4480 return 0; /* never here, make compiler happy */
4485 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4486 const char *message, gpointer user_data _U_)
4493 /* ignore log message, if log_level isn't interesting */
4494 if ( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4495 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4500 /* create a "timestamp" */
4502 today = localtime(&curr);
4504 switch(log_level & G_LOG_LEVEL_MASK) {
4505 case G_LOG_LEVEL_ERROR:
4508 case G_LOG_LEVEL_CRITICAL:
4511 case G_LOG_LEVEL_WARNING:
4514 case G_LOG_LEVEL_MESSAGE:
4517 case G_LOG_LEVEL_INFO:
4520 case G_LOG_LEVEL_DEBUG:
4524 fprintf(stderr, "unknown log_level %d\n", log_level);
4526 g_assert_not_reached();
4529 /* Generate the output message */
4530 if (log_level & G_LOG_LEVEL_MESSAGE) {
4531 /* normal user messages without additional infos */
4532 msg = g_strdup_printf("%s\n", message);
4534 /* info/debug messages with additional infos */
4535 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4536 today->tm_hour, today->tm_min, today->tm_sec,
4537 log_domain != NULL ? log_domain : "",
4541 /* DEBUG & INFO msgs (if we're debugging today) */
4542 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4543 if ( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4544 #ifdef DEBUG_DUMPCAP
4545 fprintf(stderr, "%s", msg);
4548 #ifdef DEBUG_CHILD_DUMPCAP
4549 fprintf(debug_log, "%s", msg);
4557 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4558 /* to parent especially formatted if dumpcap running as child. */
4559 if (capture_child) {
4560 sync_pipe_errmsg_to_parent(2, msg, "");
4562 fprintf(stderr, "%s", msg);
4569 /****************************************************************************************************************/
4570 /* indication report routines */
4574 report_packet_count(unsigned int packet_count)
4576 char tmp[SP_DECISIZE+1+1];
4577 static unsigned int count = 0;
4579 if (capture_child) {
4580 g_snprintf(tmp, sizeof(tmp), "%u", packet_count);
4581 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4582 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4584 count += packet_count;
4585 fprintf(stderr, "\rPackets: %u ", count);
4586 /* stderr could be line buffered */
4592 report_new_capture_file(const char *filename)
4594 if (capture_child) {
4595 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4596 pipe_write_block(2, SP_FILE, filename);
4600 * Prevent a SIGINFO handler from writing to the standard error
4601 * while we're doing so; instead, have it just set a flag telling
4602 * us to print that information when we're done.
4605 #endif /* SIGINFO */
4606 fprintf(stderr, "File: %s\n", filename);
4607 /* stderr could be line buffered */
4612 * Allow SIGINFO handlers to write.
4617 * If a SIGINFO handler asked us to write out capture counts, do so.
4620 report_counts_for_siginfo();
4621 #endif /* SIGINFO */
4626 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4628 interface_options interface_opts;
4629 char tmp[MSG_MAX_LENGTH+1+6];
4631 if (i < capture_opts->ifaces->len) {
4632 if (capture_child) {
4633 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4634 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4635 pipe_write_block(2, SP_BAD_FILTER, tmp);
4638 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4639 * the error message below.
4641 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4643 "Invalid capture filter \"%s\" for interface '%s'.\n"
4645 "That string isn't a valid capture filter (%s).\n"
4646 "See the User's Guide for a description of the capture filter syntax.",
4647 interface_opts.cfilter, interface_opts.name, errmsg);
4653 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4655 if (capture_child) {
4656 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4657 "Primary Error: %s", error_msg);
4658 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4659 "Secondary Error: %s", secondary_error_msg);
4660 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4662 cmdarg_err("%s", error_msg);
4663 if (secondary_error_msg[0] != '\0')
4664 cmdarg_err_cont("%s", secondary_error_msg);
4669 report_packet_drops(guint32 received, guint32 pcap_drops, guint32 drops, guint32 flushed, guint32 ps_ifdrop, gchar *name)
4671 char tmp[SP_DECISIZE+1+1];
4672 guint32 total_drops = pcap_drops + drops + flushed;
4674 g_snprintf(tmp, sizeof(tmp), "%u", total_drops);
4676 if (capture_child) {
4677 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4678 "Packets received/dropped on interface '%s': %u/%u (pcap:%u/dumpcap:%u/flushed:%u/ps_ifdrop:%u)",
4679 name, received, total_drops, pcap_drops, drops, flushed, ps_ifdrop);
4680 /* XXX: Need to provide interface id, changes to consumers required. */
4681 pipe_write_block(2, SP_DROPS, tmp);
4684 "Packets received/dropped on interface '%s': %u/%u (pcap:%u/dumpcap:%u/flushed:%u/ps_ifdrop:%u) (%.1f%%)\n",
4685 name, received, total_drops, pcap_drops, drops, flushed, ps_ifdrop,
4686 received ? 100.0 * received / (received + total_drops) : 0.0);
4687 /* stderr could be line buffered */
4693 /************************************************************************************************/
4694 /* signal_pipe handling */
4699 signal_pipe_check_running(void)
4701 /* any news from our parent? -> just stop the capture */
4705 /* if we are running standalone, no check required */
4706 if (!capture_child) {
4710 if (!sig_pipe_name || !sig_pipe_handle) {
4711 /* This shouldn't happen */
4712 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4713 "Signal pipe: No name or handle");
4718 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4719 * at this point. Should we check to see if the parent is still alive,
4720 * e.g. by using OpenProcess?
4723 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4725 if (!result || avail > 0) {
4726 /* peek failed or some bytes really available */
4727 /* (if not piping from stdin this would fail) */
4728 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4729 "Signal pipe: Stop capture: %s", sig_pipe_name);
4730 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4731 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4732 sig_pipe_handle, result, avail);
4735 /* pipe ok and no bytes available */
4742 * Editor modelines - https://www.wireshark.org/tools/modelines.html
4747 * indent-tabs-mode: nil
4750 * vi: set shiftwidth=4 tabstop=8 expandtab:
4751 * :indentSize=4:tabSize=8:noTabs=true: