5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
63 #include "wsutil/wsgetopt.h"
71 # include <sys/prctl.h>
72 # include <sys/capability.h>
75 #include "ringbuffer.h"
76 #include "clopts_common.h"
77 #include "console_io.h"
78 #include "cmdarg_err.h"
79 #include "version_info.h"
81 #include "capture-pcap-util.h"
83 #include "capture-wpcap.h"
89 #include "capture-wpcap.h"
90 #include <wsutil/unicode-utils.h>
94 #include <sys/socket.h>
98 #ifdef NEED_INET_V6DEFS_H
99 # include "wsutil/inet_v6defs.h"
102 #include <wsutil/privileges.h>
104 #include "sync_pipe.h"
106 #include "capture_opts.h"
107 #include "capture_ifinfo.h"
108 #include "capture_sync.h"
110 #include "conditions.h"
111 #include "capture_stop_conditions.h"
113 #include "tempfile.h"
115 #include "wsutil/file_util.h"
118 * Get information about libpcap format from "wiretap/libpcap.h".
119 * XXX - can we just use pcap_open_offline() to read the pipe?
121 #include "wiretap/libpcap.h"
123 /**#define DEBUG_DUMPCAP**/
124 /**#define DEBUG_CHILD_DUMPCAP**/
128 #include <conio.h> /* _getch() */
132 #ifdef DEBUG_CHILD_DUMPCAP
133 FILE *debug_log; /* for logging debug messages to */
134 /* a file if DEBUG_CHILD_DUMPCAP */
138 static GAsyncQueue *pcap_queue;
139 static gint64 pcap_queue_bytes;
140 static gint64 pcap_queue_packets;
141 static gint64 pcap_queue_byte_limit = 1024 * 1024;
142 static gint64 pcap_queue_packet_limit = 1000;
144 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
146 static gchar *sig_pipe_name = NULL;
147 static HANDLE sig_pipe_handle = NULL;
148 static gboolean signal_pipe_check_running(void);
152 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
153 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
156 /** Stop a low-level capture (stops the capture child). */
157 static void capture_loop_stop(void);
159 #if !defined (__linux__)
160 #ifndef HAVE_PCAP_BREAKLOOP
162 * We don't have pcap_breakloop(), which is the only way to ensure that
163 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
164 * won't, if the call to read the next packet or batch of packets is
165 * is interrupted by a signal on UN*X, just go back and try again to
168 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
169 * the signal handler, set a flag to stop capturing; however, without
170 * a guarantee of that sort, we can't guarantee that we'll stop capturing
171 * if the read will be retried and won't time out if no packets arrive.
173 * Therefore, on at least some platforms, we work around the lack of
174 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
175 * to wait for packets to arrive, so that we're probably going to be
176 * blocked in the select() when the signal arrives, and can just bail
177 * out of the loop at that point.
179 * However, we don't want to do that on BSD (because "select()" doesn't work
180 * correctly on BPF devices on at least some releases of some flavors of
181 * BSD), and we don't want to do it on Windows (because "select()" is
182 * something for sockets, not for arbitrary handles). (Note that "Windows"
183 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
184 * using WinPcap, not a UNIX libpcap.)
186 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
187 * on BSD times out even if no packets have arrived, so we'll eventually
188 * exit pcap_dispatch() with an indication that no packets have arrived,
189 * and will break out of the capture loop at that point.
191 * On Windows, we can't send a SIGINT to stop capturing, so none of this
192 * applies in any case.
194 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
195 * want to include it if it's not present on this platform, however.
197 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
198 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
200 # define MUST_DO_SELECT
201 # endif /* avoid select */
202 #endif /* HAVE_PCAP_BREAKLOOP */
204 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
205 * in pcap_dispatch(); on the other hand, select() works just fine there.
206 * Hence we use a select for that come what may.
208 #define MUST_DO_SELECT
211 /** init the capture filter */
214 INITFILTER_BAD_FILTER,
215 INITFILTER_OTHER_ERROR
216 } initfilter_status_t;
218 typedef struct _pcap_options {
222 #ifdef MUST_DO_SELECT
223 int pcap_fd; /* pcap file descriptor */
230 gboolean ts_nsec; /* TRUE if we're using nanosecond precision. */
231 /* capture pipe (unix only "input file") */
232 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
233 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
234 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
236 HANDLE cap_pipe_h; /* The handle of the capture pipe */
238 int cap_pipe_fd; /* the file descriptor of the capture pipe */
240 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
241 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
243 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
245 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
246 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
248 STATE_EXPECT_REC_HDR,
253 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
255 GMutex *cap_pipe_read_mtx;
256 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
260 typedef struct _loop_data {
262 gboolean go; /* TRUE as long as we're supposed to keep capturing */
263 int err; /* if non-zero, error seen while capturing */
264 gint packet_count; /* Number of packets we have already captured */
265 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
266 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
268 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
275 guint32 autostop_files;
278 typedef struct _pcap_queue_element {
279 pcap_options *pcap_opts;
280 struct pcap_pkthdr phdr;
282 } pcap_queue_element;
285 * Standard secondary message for unexpected errors.
287 static const char please_report[] =
288 "Please report this to the Wireshark developers.\n"
289 "(This is not a crash; please do not report it as such.)";
292 * This needs to be static, so that the SIGINT handler can clear the "go"
295 static loop_data global_ld;
299 * Timeout, in milliseconds, for reads from the stream of captured packets
300 * from a capture device.
302 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
303 * 64-bit applications, with sub-second timeouts not to work. The bug is
304 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
306 #if defined(__APPLE__) && defined(__LP64__)
307 static gboolean need_timeout_workaround;
309 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
311 #define CAP_READ_TIMEOUT 250
315 * Timeout, in microseconds, for reads from the stream of captured packets
316 * from a pipe. Pipes don't have the same problem that BPF devices do
317 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
318 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
319 * of the offending versions of Snow Leopard.
321 * On Windows this value is converted to milliseconds and passed to
322 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
323 * will return immediately.
326 #define PIPE_READ_TIMEOUT 100000
328 #define PIPE_READ_TIMEOUT 250000
331 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
334 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
335 const char *message, gpointer user_data _U_);
337 /* capture related options */
338 static capture_options global_capture_opts;
339 static gboolean quiet = FALSE;
340 static gboolean use_threads = FALSE;
341 static guint64 start_time;
343 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
345 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
347 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
348 int err, gboolean is_close);
350 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
352 static void report_new_capture_file(const char *filename);
353 static void report_packet_count(int packet_count);
354 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
355 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
356 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
358 #define MSG_MAX_LENGTH 4096
360 /* Copied from pcapio.c libpcap_write_interface_statistics_block()*/
362 create_timestamp(void) {
372 * Current time, represented as 100-nanosecond intervals since
373 * January 1, 1601, 00:00:00 UTC.
375 * I think DWORD might be signed, so cast both parts of "now"
376 * to guint32 so that the sign bit doesn't get treated specially.
378 * Windows 8 provides GetSystemTimePreciseAsFileTime which we
379 * might want to use instead.
381 GetSystemTimeAsFileTime(&now);
382 timestamp = (((guint64)(guint32)now.dwHighDateTime) << 32) +
383 (guint32)now.dwLowDateTime;
386 * Convert to same thing but as 1-microsecond, i.e. 1000-nanosecond,
392 * Subtract difference, in microseconds, between January 1, 1601
393 * 00:00:00 UTC and January 1, 1970, 00:00:00 UTC.
395 timestamp -= G_GINT64_CONSTANT(11644473600000000U);
398 * Current time, represented as seconds and microseconds since
399 * January 1, 1970, 00:00:00 UTC.
401 gettimeofday(&now, NULL);
404 * Convert to delta in microseconds.
406 timestamp = (guint64)(now.tv_sec) * 1000000 +
407 (guint64)(now.tv_usec);
413 print_usage(gboolean print_ver)
420 "Dumpcap " VERSION "%s\n"
421 "Capture network packets and dump them into a pcapng file.\n"
422 "See http://www.wireshark.org for more information.\n",
423 wireshark_svnversion);
427 fprintf(output, "\nUsage: dumpcap [options] ...\n");
428 fprintf(output, "\n");
429 fprintf(output, "Capture interface:\n");
430 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
431 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
432 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
433 fprintf(output, " -p don't capture in promiscuous mode\n");
434 #ifdef HAVE_PCAP_CREATE
435 fprintf(output, " -I capture in monitor mode, if available\n");
437 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
438 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
440 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
441 fprintf(output, " -D print list of interfaces and exit\n");
442 fprintf(output, " -L print list of link-layer types of iface and exit\n");
443 #ifdef HAVE_BPF_IMAGE
444 fprintf(output, " -d print generated BPF code for capture filter\n");
446 fprintf(output, " -S print statistics for each interface once per second\n");
447 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
448 fprintf(output, "\n");
449 #ifdef HAVE_PCAP_REMOTE
450 fprintf(output, "RPCAP options:\n");
451 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
452 fprintf(output, " -u use UDP for RPCAP data transfer\n");
453 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
454 #ifdef HAVE_PCAP_SETSAMPLING
455 fprintf(output, " -m <sampling type> use packet sampling\n");
456 fprintf(output, " count:NUM - capture one packet of every NUM\n");
457 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
460 fprintf(output, "Stop conditions:\n");
461 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
462 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
463 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
464 fprintf(output, " files:NUM - stop after NUM files\n");
465 /*fprintf(output, "\n");*/
466 fprintf(output, "Output (files):\n");
467 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
468 fprintf(output, " -g enable group read access on the output file(s)\n");
469 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
470 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
471 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
472 fprintf(output, " -n use pcapng format instead of pcap (default)\n");
473 fprintf(output, " -P use libpcap format instead of pcapng\n");
474 fprintf(output, "\n");
475 fprintf(output, "Miscellaneous:\n");
476 fprintf(output, " -t use a separate thread per interface\n");
477 fprintf(output, " -q don't report packet capture counts\n");
478 fprintf(output, " -v print version information and exit\n");
479 fprintf(output, " -h display this help and exit\n");
480 fprintf(output, "\n");
481 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcapng\n");
482 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcapng\"\n");
483 fprintf(output, "\n");
484 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
488 show_version(GString *comp_info_str, GString *runtime_info_str)
491 "Dumpcap " VERSION "%s\n"
496 "See http://www.wireshark.org for more information.\n",
497 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
501 * Print to the standard error. This is a command-line tool, so there's
502 * no need to pop up a console.
505 vfprintf_stderr(const char *fmt, va_list ap)
507 vfprintf(stderr, fmt, ap);
511 fprintf_stderr(const char *fmt, ...)
516 vfprintf_stderr(fmt, ap);
521 * Report an error in command-line arguments.
524 cmdarg_err(const char *fmt, ...)
530 /* Generate a 'special format' message back to parent */
532 msg = g_strdup_vprintf(fmt, ap);
533 sync_pipe_errmsg_to_parent(2, msg, "");
538 fprintf(stderr, "dumpcap: ");
539 vfprintf(stderr, fmt, ap);
540 fprintf(stderr, "\n");
546 * Report additional information for an error in command-line arguments.
549 cmdarg_err_cont(const char *fmt, ...)
556 msg = g_strdup_vprintf(fmt, ap);
557 sync_pipe_errmsg_to_parent(2, msg, "");
562 vfprintf(stderr, fmt, ap);
563 fprintf(stderr, "\n");
570 #if 0 /* Set to enable capability debugging */
571 /* see 'man cap_to_text()' for explanation of output */
572 /* '=' means 'all= ' ie: no capabilities */
573 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
575 print_caps(const char *pfx) {
576 cap_t caps = cap_get_proc();
577 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
578 "%s: EUID: %d Capabilities: %s", pfx,
579 geteuid(), cap_to_text(caps, NULL));
582 print_caps(const char *pfx _U_) {
587 relinquish_all_capabilities(void)
589 /* Drop any and all capabilities this process may have. */
590 /* Allowed whether or not process has any privileges. */
591 cap_t caps = cap_init(); /* all capabilities initialized to off */
592 print_caps("Pre-clear");
593 if (cap_set_proc(caps)) {
594 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
596 print_caps("Post-clear");
602 open_capture_device(interface_options *interface_opts,
603 char (*open_err_str)[PCAP_ERRBUF_SIZE])
606 #ifdef HAVE_PCAP_CREATE
609 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
610 struct pcap_rmtauth auth;
613 /* Open the network interface to capture from it.
614 Some versions of libpcap may put warnings into the error buffer
615 if they succeed; to tell if that's happened, we have to clear
616 the error buffer, and check if it's still a null string. */
617 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Entering open_capture_device().");
618 (*open_err_str)[0] = '\0';
619 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
621 * If we're opening a remote device, use pcap_open(); that's currently
622 * the only open routine that supports remote devices.
624 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
625 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
626 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
627 auth.username = interface_opts->auth_username;
628 auth.password = interface_opts->auth_password;
630 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
631 "Calling pcap_open() using name %s, snaplen %d, promisc_mode %d, datatx_udp %d, nocap_rpcap %d.",
632 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode,
633 interface_opts->datatx_udp, interface_opts->nocap_rpcap);
634 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
636 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
637 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
638 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
639 CAP_READ_TIMEOUT, &auth, *open_err_str);
640 if ((*open_err_str)[0] == '\0') {
641 /* Work around known WinPcap bug wherein no error message is
642 filled in on a failure to open an rpcap: URL. */
643 g_strlcpy(*open_err_str,
644 "Unknown error (pcap bug; actual error cause not reported)",
645 sizeof *open_err_str);
647 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
648 "pcap_open() returned %p.", (void *)pcap_h);
653 * If we're not opening a remote device, use pcap_create() and
654 * pcap_activate() if we have them, so that we can set the buffer
655 * size, otherwise use pcap_open_live().
657 #ifdef HAVE_PCAP_CREATE
658 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
659 "Calling pcap_create() using %s.", interface_opts->name);
660 pcap_h = pcap_create(interface_opts->name, *open_err_str);
661 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
662 "pcap_create() returned %p.", (void *)pcap_h);
663 if (pcap_h != NULL) {
664 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
665 "Calling pcap_set_snaplen() with snaplen %d.", interface_opts->snaplen);
666 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
667 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
668 "Calling pcap_set_promisc() with promisc_mode %d.", interface_opts->promisc_mode);
669 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
670 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
672 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
673 "buffersize %d.", interface_opts->buffer_size);
674 if (interface_opts->buffer_size > 1) {
675 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
677 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
678 "monitor_mode %d.", interface_opts->monitor_mode);
679 if (interface_opts->monitor_mode)
680 pcap_set_rfmon(pcap_h, 1);
681 err = pcap_activate(pcap_h);
682 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
683 "pcap_activate() returned %d.", err);
685 /* Failed to activate, set to NULL */
686 if (err == PCAP_ERROR)
687 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
689 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
695 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
696 "pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
697 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode);
698 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
699 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
701 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
702 "pcap_open_live() returned %p.", (void *)pcap_h);
705 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
710 get_capture_device_open_failure_messages(const char *open_err_str,
716 char *errmsg, size_t errmsg_len,
717 char *secondary_errmsg,
718 size_t secondary_errmsg_len)
720 const char *libpcap_warn;
721 static const char ppamsg[] = "can't find PPA for ";
723 /* If we got a "can't find PPA for X" message, warn the user (who
724 is running dumpcap on HP-UX) that they don't have a version of
725 libpcap that properly handles HP-UX (libpcap 0.6.x and later
726 versions, which properly handle HP-UX, say "can't find /dev/dlpi
727 PPA for X" rather than "can't find PPA for X"). */
728 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
731 "You are running (T)Wireshark with a version of the libpcap library\n"
732 "that doesn't handle HP-UX network devices well; this means that\n"
733 "(T)Wireshark may not be able to capture packets.\n"
735 "To fix this, you should install libpcap 0.6.2, or a later version\n"
736 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
737 "packaged binary form from the Software Porting And Archive Centre\n"
738 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
739 "at the URL lists a number of mirror sites.";
742 g_snprintf(errmsg, (gulong) errmsg_len,
743 "The capture session could not be initiated (%s).", open_err_str);
746 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
748 "In order to capture packets, WinPcap must be installed; see\n"
750 " http://www.winpcap.org/\n"
754 " http://www.mirrors.wiretapped.net/security/packet-capture/winpcap/\n"
758 " http://winpcap.cs.pu.edu.tw/\n"
760 "for a downloadable version of WinPcap and for instructions on how to install\n"
763 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
765 "Please check that \"%s\" is the proper interface.\n"
768 "Help can be found at:\n"
770 " http://wiki.wireshark.org/WinPcap\n"
771 " http://wiki.wireshark.org/CaptureSetup\n",
775 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
776 "Please check to make sure you have sufficient permissions, and that you have "
777 "the proper interface or pipe specified.%s", libpcap_warn);
781 /* Set the data link type on a pcap. */
783 set_pcap_linktype(pcap_t *pcap_h, int linktype,
784 #ifdef HAVE_PCAP_SET_DATALINK
789 char *errmsg, size_t errmsg_len,
790 char *secondary_errmsg, size_t secondary_errmsg_len)
792 char *set_linktype_err_str;
795 return TRUE; /* just use the default */
796 #ifdef HAVE_PCAP_SET_DATALINK
797 if (pcap_set_datalink(pcap_h, linktype) == 0)
798 return TRUE; /* no error */
799 set_linktype_err_str = pcap_geterr(pcap_h);
801 /* Let them set it to the type it is; reject any other request. */
802 if (get_pcap_linktype(pcap_h, name) == linktype)
803 return TRUE; /* no error */
804 set_linktype_err_str =
805 "That DLT isn't one of the DLTs supported by this device";
807 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
808 set_linktype_err_str);
810 * If the error isn't "XXX is not one of the DLTs supported by this device",
811 * tell the user to tell the Wireshark developers about it.
813 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
814 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
816 secondary_errmsg[0] = '\0';
821 compile_capture_filter(const char *iface, pcap_t *pcap_h,
822 struct bpf_program *fcode, const char *cfilter)
824 bpf_u_int32 netnum, netmask;
825 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
827 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
829 * Well, we can't get the netmask for this interface; it's used
830 * only for filters that check for broadcast IP addresses, so
831 * we just punt and use 0. It might be nice to warn the user,
832 * but that's a pain in a GUI application, as it'd involve popping
833 * up a message box, and it's not clear how often this would make
834 * a difference (only filters that check for IP broadcast addresses
838 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
843 * Sigh. Older versions of libpcap don't properly declare the
844 * third argument to pcap_compile() as a const pointer. Cast
847 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
852 #ifdef HAVE_BPF_IMAGE
854 show_filter_code(capture_options *capture_opts)
856 interface_options interface_opts;
858 gchar open_err_str[PCAP_ERRBUF_SIZE];
859 char errmsg[MSG_MAX_LENGTH+1];
860 char secondary_errmsg[MSG_MAX_LENGTH+1];
861 struct bpf_program fcode;
862 struct bpf_insn *insn;
866 for (j = 0; j < capture_opts->ifaces->len; j++) {
867 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
868 pcap_h = open_capture_device(&interface_opts, &open_err_str);
869 if (pcap_h == NULL) {
870 /* Open failed; get messages */
871 get_capture_device_open_failure_messages(open_err_str,
873 errmsg, sizeof errmsg,
875 sizeof secondary_errmsg);
876 /* And report them */
877 report_capture_error(errmsg, secondary_errmsg);
881 /* Set the link-layer type. */
882 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
883 errmsg, sizeof errmsg,
884 secondary_errmsg, sizeof secondary_errmsg)) {
886 report_capture_error(errmsg, secondary_errmsg);
890 /* OK, try to compile the capture filter. */
891 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
892 interface_opts.cfilter)) {
894 report_cfilter_error(capture_opts, j, errmsg);
899 /* Now print the filter code. */
900 insn = fcode.bf_insns;
902 for (i = 0; i < fcode.bf_len; insn++, i++)
903 printf("%s\n", bpf_image(insn, i));
905 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
906 /* to remove any suid privileges. */
907 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
908 /* (euid/egid have already previously been set to ruid/rgid. */
909 /* (See comment in main() for details) */
911 relinquish_special_privs_perm();
913 relinquish_all_capabilities();
916 /* Let our parent know we succeeded. */
917 pipe_write_block(2, SP_SUCCESS, NULL);
924 * capture_interface_list() is expected to do the right thing to get
925 * a list of interfaces.
927 * In most of the programs in the Wireshark suite, "the right thing"
928 * is to run dumpcap and ask it for the list, because dumpcap may
929 * be the only program in the suite with enough privileges to get
932 * In dumpcap itself, however, we obviously can't run dumpcap to
933 * ask for the list. Therefore, our capture_interface_list() should
934 * just call get_interface_list().
937 capture_interface_list(int *err, char **err_str)
939 return get_interface_list(err, err_str);
943 * Get the data-link type for a libpcap device.
944 * This works around AIX 5.x's non-standard and incompatible-with-the-
945 * rest-of-the-universe libpcap.
948 get_pcap_linktype(pcap_t *pch, const char *devname
956 const char *ifacename;
959 linktype = pcap_datalink(pch);
963 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
964 * rather than DLT_ values for link-layer types; the ifType values
965 * for LAN devices are:
972 * and the ifType value for a loopback device is 24.
974 * The AIX names for LAN devices begin with:
981 * and the AIX names for loopback devices begin with "lo".
983 * (The difference between "Ethernet" and "802.3" is presumably
984 * whether packets have an Ethernet header, with a packet type,
985 * or an 802.3 header, with a packet length, followed by an 802.2
986 * header and possibly a SNAP header.)
988 * If the device name matches "linktype" interpreted as an ifType
989 * value, rather than as a DLT_ value, we will assume this is AIX's
990 * non-standard, incompatible libpcap, rather than a standard libpcap,
991 * and will map the link-layer type to the standard DLT_ value for
992 * that link-layer type, as that's what the rest of Wireshark expects.
994 * (This means the capture files won't be readable by a tcpdump
995 * linked with AIX's non-standard libpcap, but so it goes. They
996 * *will* be readable by standard versions of tcpdump, Wireshark,
999 * XXX - if we conclude we're using AIX libpcap, should we also
1000 * set a flag to cause us to assume the time stamps are in
1001 * seconds-and-nanoseconds form, and to convert them to
1002 * seconds-and-microseconds form before processing them and
1007 * Find the last component of the device name, which is the
1010 ifacename = strchr(devname, '/');
1011 if (ifacename == NULL)
1012 ifacename = devname;
1014 /* See if it matches any of the LAN device names. */
1015 if (strncmp(ifacename, "en", 2) == 0) {
1016 if (linktype == 6) {
1018 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
1022 } else if (strncmp(ifacename, "et", 2) == 0) {
1023 if (linktype == 7) {
1025 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
1026 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
1031 } else if (strncmp(ifacename, "tr", 2) == 0) {
1032 if (linktype == 9) {
1034 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
1035 * DLT_IEEE802, which is what's used for Token Ring.
1039 } else if (strncmp(ifacename, "fi", 2) == 0) {
1040 if (linktype == 15) {
1042 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
1046 } else if (strncmp(ifacename, "lo", 2) == 0) {
1047 if (linktype == 24) {
1049 * That's the RFC 1573 value for "software loopback" devices; map it
1050 * to DLT_NULL, which is what's used for loopback devices on BSD.
1060 static data_link_info_t *
1061 create_data_link_info(int dlt)
1063 data_link_info_t *data_link_info;
1066 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
1067 data_link_info->dlt = dlt;
1068 text = pcap_datalink_val_to_name(dlt);
1070 data_link_info->name = g_strdup(text);
1072 data_link_info->name = g_strdup_printf("DLT %d", dlt);
1073 text = pcap_datalink_val_to_description(dlt);
1075 data_link_info->description = g_strdup(text);
1077 data_link_info->description = NULL;
1078 return data_link_info;
1082 * Get the capabilities of a network device.
1084 static if_capabilities_t *
1085 get_if_capabilities(const char *devname, gboolean monitor_mode
1086 #ifndef HAVE_PCAP_CREATE
1091 if_capabilities_t *caps;
1092 char errbuf[PCAP_ERRBUF_SIZE];
1094 #ifdef HAVE_PCAP_CREATE
1098 #ifdef HAVE_PCAP_LIST_DATALINKS
1102 data_link_info_t *data_link_info;
1105 * Allocate the interface capabilities structure.
1107 caps = g_malloc(sizeof *caps);
1110 * WinPcap 4.1.2, and possibly earlier versions, have a bug
1111 * wherein, when an open with an rpcap: URL fails, the error
1112 * message for the error is not copied to errbuf and whatever
1113 * on-the-stack junk is in errbuf is treated as the error
1116 * To work around that (and any other bugs of that sort, we
1117 * initialize errbuf to an empty string. If we get an error
1118 * and the string is empty, we report it as an unknown error.
1119 * (If we *don't* get an error, and the string is *non*-empty,
1120 * that could be a warning returned, such as "can't turn
1121 * promiscuous mode on"; we currently don't do so.)
1124 #ifdef HAVE_PCAP_OPEN
1125 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1126 caps->can_set_rfmon = FALSE;
1128 if (err_str != NULL)
1129 *err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
1133 #elif defined(HAVE_PCAP_CREATE)
1134 pch = pcap_create(devname, errbuf);
1136 if (err_str != NULL)
1137 *err_str = g_strdup(errbuf);
1141 status = pcap_can_set_rfmon(pch);
1144 if (status == PCAP_ERROR)
1145 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1148 *err_str = g_strdup(pcap_statustostr(status));
1154 caps->can_set_rfmon = FALSE;
1155 else if (status == 1) {
1156 caps->can_set_rfmon = TRUE;
1158 pcap_set_rfmon(pch, 1);
1160 if (err_str != NULL) {
1161 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1169 status = pcap_activate(pch);
1171 /* Error. We ignore warnings (status > 0). */
1172 if (err_str != NULL) {
1173 if (status == PCAP_ERROR)
1174 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1177 *err_str = g_strdup(pcap_statustostr(status));
1184 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1185 caps->can_set_rfmon = FALSE;
1187 if (err_str != NULL)
1188 *err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
1193 deflt = get_pcap_linktype(pch, devname);
1194 #ifdef HAVE_PCAP_LIST_DATALINKS
1195 nlt = pcap_list_datalinks(pch, &linktypes);
1196 if (nlt == 0 || linktypes == NULL) {
1198 if (err_str != NULL)
1199 *err_str = NULL; /* an empty list doesn't mean an error */
1202 caps->data_link_types = NULL;
1203 for (i = 0; i < nlt; i++) {
1204 data_link_info = create_data_link_info(linktypes[i]);
1207 * XXX - for 802.11, make the most detailed 802.11
1208 * version the default, rather than the one the
1209 * device has as the default?
1211 if (linktypes[i] == deflt)
1212 caps->data_link_types = g_list_prepend(caps->data_link_types,
1215 caps->data_link_types = g_list_append(caps->data_link_types,
1218 #ifdef HAVE_PCAP_FREE_DATALINKS
1219 pcap_free_datalinks(linktypes);
1222 * In Windows, there's no guarantee that if you have a library
1223 * built with one version of the MSVC++ run-time library, and
1224 * it returns a pointer to allocated data, you can free that
1225 * data from a program linked with another version of the
1226 * MSVC++ run-time library.
1228 * This is not an issue on UN*X.
1230 * See the mail threads starting at
1232 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1236 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1239 #define xx_free free /* hack so checkAPIs doesn't complain */
1242 #endif /* HAVE_PCAP_FREE_DATALINKS */
1243 #else /* HAVE_PCAP_LIST_DATALINKS */
1245 data_link_info = create_data_link_info(deflt);
1246 caps->data_link_types = g_list_append(caps->data_link_types,
1248 #endif /* HAVE_PCAP_LIST_DATALINKS */
1252 if (err_str != NULL)
1257 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1259 print_machine_readable_interfaces(GList *if_list)
1266 char addr_str[ADDRSTRLEN];
1268 if (capture_child) {
1269 /* Let our parent know we succeeded. */
1270 pipe_write_block(2, SP_SUCCESS, NULL);
1273 i = 1; /* Interface id number */
1274 for (if_entry = g_list_first(if_list); if_entry != NULL;
1275 if_entry = g_list_next(if_entry)) {
1276 if_info = (if_info_t *)if_entry->data;
1277 printf("%d. %s", i++, if_info->name);
1280 * Print the contents of the if_entry struct in a parseable format.
1281 * Each if_entry element is tab-separated. Addresses are comma-
1284 /* XXX - Make sure our description doesn't contain a tab */
1285 if (if_info->description != NULL)
1286 printf("\t%s\t", if_info->description);
1290 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1291 addr = g_slist_next(addr)) {
1292 if (addr != g_slist_nth(if_info->addrs, 0))
1295 if_addr = (if_addr_t *)addr->data;
1296 switch(if_addr->ifat_type) {
1298 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1300 printf("%s", addr_str);
1302 printf("<unknown IPv4>");
1306 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1307 addr_str, ADDRSTRLEN)) {
1308 printf("%s", addr_str);
1310 printf("<unknown IPv6>");
1314 printf("<type unknown %u>", if_addr->ifat_type);
1318 if (if_info->loopback)
1319 printf("\tloopback");
1321 printf("\tnetwork");
1328 * If you change the machine-readable output format of this function,
1329 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1332 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1335 data_link_info_t *data_link_info;
1336 const gchar *desc_str;
1338 if (capture_child) {
1339 /* Let our parent know we succeeded. */
1340 pipe_write_block(2, SP_SUCCESS, NULL);
1343 if (caps->can_set_rfmon)
1347 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1348 lt_entry = g_list_next(lt_entry)) {
1349 data_link_info = (data_link_info_t *)lt_entry->data;
1350 if (data_link_info->description != NULL)
1351 desc_str = data_link_info->description;
1353 desc_str = "(not supported)";
1354 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1364 /* Print the number of packets captured for each interface until we're killed. */
1366 print_statistics_loop(gboolean machine_readable)
1368 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1374 char errbuf[PCAP_ERRBUF_SIZE];
1375 struct pcap_stat ps;
1377 if_list = get_interface_list(&err, &err_str);
1378 if (if_list == NULL) {
1380 case CANT_GET_INTERFACE_LIST:
1381 case DONT_HAVE_PCAP:
1382 cmdarg_err("%s", err_str);
1386 case NO_INTERFACES_FOUND:
1387 cmdarg_err("There are no interfaces on which a capture can be done");
1393 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1394 if_info = (if_info_t *)if_entry->data;
1395 #ifdef HAVE_PCAP_OPEN
1396 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1398 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1402 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1403 if_stat->name = g_strdup(if_info->name);
1405 stat_list = g_list_append(stat_list, if_stat);
1410 cmdarg_err("There are no interfaces on which a capture can be done");
1414 if (capture_child) {
1415 /* Let our parent know we succeeded. */
1416 pipe_write_block(2, SP_SUCCESS, NULL);
1419 if (!machine_readable) {
1420 printf("%-15s %10s %10s\n", "Interface", "Received",
1424 global_ld.go = TRUE;
1425 while (global_ld.go) {
1426 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1427 if_stat = (if_stat_t *)stat_entry->data;
1428 pcap_stats(if_stat->pch, &ps);
1430 if (!machine_readable) {
1431 printf("%-15s %10u %10u\n", if_stat->name,
1432 ps.ps_recv, ps.ps_drop);
1434 printf("%s\t%u\t%u\n", if_stat->name,
1435 ps.ps_recv, ps.ps_drop);
1446 /* XXX - Not reached. Should we look for 'q' in stdin? */
1447 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1448 if_stat = (if_stat_t *)stat_entry->data;
1449 pcap_close(if_stat->pch);
1450 g_free(if_stat->name);
1453 g_list_free(stat_list);
1454 free_interface_list(if_list);
1462 capture_cleanup_handler(DWORD dwCtrlType)
1464 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1465 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1466 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1467 like SIGTERM at least when the machine's shutting down.
1469 For now, if we're running as a command rather than a capture child,
1470 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1471 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1472 in that way on UN*X.
1474 If we're not running as a capture child, we might be running as
1475 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1476 user logs out. (XXX - can we explicitly check whether we're
1477 running as a service?) */
1479 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1480 "Console: Control signal");
1481 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1482 "Console: Control signal, CtrlType: %u", dwCtrlType);
1484 /* Keep capture running if we're a service and a user logs off */
1485 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1486 capture_loop_stop();
1494 capture_cleanup_handler(int signum _U_)
1496 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1497 SIGTERM. We assume that if the user wanted it to keep running
1498 after they logged out, they'd have nohupped it. */
1500 /* Note: don't call g_log() in the signal handler: if we happened to be in
1501 * g_log() in process context when the signal came in, g_log will detect
1502 * the "recursion" and abort.
1505 capture_loop_stop();
1511 report_capture_count(gboolean reportit)
1513 /* Don't print this if we're a capture child. */
1514 if (!capture_child && reportit) {
1515 fprintf(stderr, "\rPackets captured: %u\n", global_ld.packet_count);
1516 /* stderr could be line buffered */
1524 report_counts_for_siginfo(void)
1526 report_capture_count(quiet);
1527 infoprint = FALSE; /* we just reported it */
1531 report_counts_siginfo(int signum _U_)
1533 int sav_errno = errno;
1535 /* If we've been told to delay printing, just set a flag asking
1536 that we print counts (if we're supposed to), otherwise print
1537 the count of packets captured (if we're supposed to). */
1541 report_counts_for_siginfo();
1544 #endif /* SIGINFO */
1547 exit_main(int status)
1550 /* Shutdown windows sockets */
1553 /* can be helpful for debugging */
1554 #ifdef DEBUG_DUMPCAP
1555 printf("Press any key\n");
1566 * If we were linked with libcap (not libpcap), make sure we have
1567 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1568 * (See comment in main() for details)
1571 relinquish_privs_except_capture(void)
1573 /* If 'started_with_special_privs' (ie: suid) then enable for
1574 * ourself the NET_ADMIN and NET_RAW capabilities and then
1575 * drop our suid privileges.
1577 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1578 * stuff we don't need (and shouldn't have).
1579 * CAP_NET_RAW: Packet capture (raw sockets).
1582 if (started_with_special_privs()) {
1583 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1584 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1586 cap_t caps = cap_init(); /* all capabilities initialized to off */
1588 print_caps("Pre drop, pre set");
1590 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1591 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1594 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1595 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1597 if (cap_set_proc(caps)) {
1598 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1600 print_caps("Pre drop, post set");
1602 relinquish_special_privs_perm();
1604 print_caps("Post drop, pre set");
1605 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1606 if (cap_set_proc(caps)) {
1607 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1609 print_caps("Post drop, post set");
1615 #endif /* HAVE_LIBCAP */
1617 /* Take care of byte order in the libpcap headers read from pipes.
1618 * (function taken from wiretap/libpcap.c) */
1620 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1623 /* Byte-swap the record header fields. */
1624 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1625 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1626 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1627 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1630 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1631 swapped, in order to match the BPF header layout.
1633 Unfortunately, some files were, according to a comment in the "libpcap"
1634 source, written with version 2.3 in their headers but without the
1635 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1636 would make no sense - we assume that we need to swap them. */
1637 if (hdr->version_major == 2 &&
1638 (hdr->version_minor < 3 ||
1639 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1642 temp = rechdr->orig_len;
1643 rechdr->orig_len = rechdr->incl_len;
1644 rechdr->incl_len = temp;
1650 * Thread function that reads from a pipe and pushes the data
1651 * to the main application thread.
1654 * XXX Right now we use async queues for basic signaling. The main thread
1655 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1656 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1657 * Iff the read is successful cap_pipe_read pushes an item onto
1658 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1659 * the queues themselves (yet).
1661 * We might want to move some of the cap_pipe_dispatch logic here so that
1662 * we can let cap_pipe_read run independently, queuing up multiple reads
1663 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1665 static void *cap_pipe_read(void *arg)
1667 pcap_options *pcap_opts;
1676 pcap_opts = (pcap_options *)arg;
1677 while (pcap_opts->cap_pipe_err == PIPOK) {
1678 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1679 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1681 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1683 /* If we try to use read() on a named pipe on Windows with partial
1684 * data it appears to return EOF.
1686 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1687 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1692 last_err = GetLastError();
1693 if (last_err == ERROR_MORE_DATA) {
1695 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1696 pcap_opts->cap_pipe_err = PIPEOF;
1700 pcap_opts->cap_pipe_err = PIPERR;
1703 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1704 pcap_opts->cap_pipe_err = PIPEOF;
1709 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1710 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1713 pcap_opts->cap_pipe_err = PIPEOF;
1717 pcap_opts->cap_pipe_err = PIPERR;
1726 pcap_opts->cap_pipe_bytes_read = bytes_read;
1727 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1728 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1730 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1736 #if !defined(_WIN32) || defined(MUST_DO_SELECT)
1737 /* Provide select() functionality for a single file descriptor
1738 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1740 * Returns the same values as select.
1743 cap_pipe_select(int pipe_fd)
1746 struct timeval timeout;
1749 FD_SET(pipe_fd, &rfds);
1751 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1752 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1754 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1759 /* Mimic pcap_open_live() for pipe captures
1761 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1762 * open it, and read the header.
1764 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1765 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1767 cap_pipe_open_live(char *pipename,
1768 pcap_options *pcap_opts,
1769 struct pcap_hdr *hdr,
1770 char *errmsg, int errmsgl)
1773 ws_statb64 pipe_stat;
1774 struct sockaddr_un sa;
1785 unsigned int bytes_read;
1790 pcap_opts->cap_pipe_fd = -1;
1792 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1794 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1797 * XXX - this blocks until a pcap per-file header has been written to
1798 * the pipe, so it could block indefinitely.
1800 if (strcmp(pipename, "-") == 0) {
1802 fd = 0; /* read from stdin */
1804 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1808 if (ws_stat64(pipename, &pipe_stat) < 0) {
1809 if (errno == ENOENT || errno == ENOTDIR)
1810 pcap_opts->cap_pipe_err = PIPNEXIST;
1812 g_snprintf(errmsg, errmsgl,
1813 "The capture session could not be initiated "
1814 "due to error getting information on pipe/socket: %s", g_strerror(errno));
1815 pcap_opts->cap_pipe_err = PIPERR;
1819 if (S_ISFIFO(pipe_stat.st_mode)) {
1820 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1822 g_snprintf(errmsg, errmsgl,
1823 "The capture session could not be initiated "
1824 "due to error on pipe open: %s", g_strerror(errno));
1825 pcap_opts->cap_pipe_err = PIPERR;
1828 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1829 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1831 g_snprintf(errmsg, errmsgl,
1832 "The capture session could not be initiated "
1833 "due to error on socket create: %s", g_strerror(errno));
1834 pcap_opts->cap_pipe_err = PIPERR;
1837 sa.sun_family = AF_UNIX;
1839 * The Single UNIX Specification says:
1841 * The size of sun_path has intentionally been left undefined.
1842 * This is because different implementations use different sizes.
1843 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1844 * of 104. Since most implementations originate from BSD versions,
1845 * the size is typically in the range 92 to 108.
1847 * Applications should not assume a particular length for sun_path
1848 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1852 * The <sys/un.h> header shall define the sockaddr_un structure,
1853 * which shall include at least the following members:
1855 * sa_family_t sun_family Address family.
1856 * char sun_path[] Socket pathname.
1858 * so we assume that it's an array, with a specified size,
1859 * and that the size reflects the maximum path length.
1861 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1862 /* Path name too long */
1863 g_snprintf(errmsg, errmsgl,
1864 "The capture session coud not be initiated "
1865 "due to error on socket connect: Path name too long");
1866 pcap_opts->cap_pipe_err = PIPERR;
1869 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1871 g_snprintf(errmsg, errmsgl,
1872 "The capture session coud not be initiated "
1873 "due to error on socket connect: %s", g_strerror(errno));
1874 pcap_opts->cap_pipe_err = PIPERR;
1878 if (S_ISCHR(pipe_stat.st_mode)) {
1880 * Assume the user specified an interface on a system where
1881 * interfaces are in /dev. Pretend we haven't seen it.
1883 pcap_opts->cap_pipe_err = PIPNEXIST;
1886 g_snprintf(errmsg, errmsgl,
1887 "The capture session could not be initiated because\n"
1888 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1889 pcap_opts->cap_pipe_err = PIPERR;
1894 #define PIPE_STR "\\pipe\\"
1895 /* Under Windows, named pipes _must_ have the form
1896 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1898 pncopy = g_strdup(pipename);
1899 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1900 pos = strchr(pncopy + 3, '\\');
1901 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1908 g_snprintf(errmsg, errmsgl,
1909 "The capture session could not be initiated because\n"
1910 "\"%s\" is neither an interface nor a pipe", pipename);
1911 pcap_opts->cap_pipe_err = PIPNEXIST;
1915 /* Wait for the pipe to appear */
1917 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1918 OPEN_EXISTING, 0, NULL);
1920 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1923 if (GetLastError() != ERROR_PIPE_BUSY) {
1924 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1925 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1926 g_snprintf(errmsg, errmsgl,
1927 "The capture session on \"%s\" could not be started "
1928 "due to error on pipe open: %s (error %d)",
1929 pipename, utf_16to8(err_str), GetLastError());
1931 pcap_opts->cap_pipe_err = PIPERR;
1935 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1936 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1937 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1938 g_snprintf(errmsg, errmsgl,
1939 "The capture session on \"%s\" timed out during "
1940 "pipe open: %s (error %d)",
1941 pipename, utf_16to8(err_str), GetLastError());
1943 pcap_opts->cap_pipe_err = PIPERR;
1950 pcap_opts->from_cap_pipe = TRUE;
1953 /* read the pcap header */
1955 while (bytes_read < sizeof magic) {
1956 sel_ret = cap_pipe_select(fd);
1958 g_snprintf(errmsg, errmsgl,
1959 "Unexpected error from select: %s", g_strerror(errno));
1961 } else if (sel_ret > 0) {
1962 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1965 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1967 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1975 g_thread_create(&cap_pipe_read, pcap_opts, FALSE, NULL);
1977 pcap_opts->cap_pipe_buf = (char *) &magic;
1978 pcap_opts->cap_pipe_bytes_read = 0;
1979 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1980 /* We don't have to worry about cap_pipe_read_mtx here */
1981 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1982 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1983 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1984 if (pcap_opts->cap_pipe_bytes_read == 0)
1985 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1987 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1996 case PCAP_NSEC_MAGIC:
1997 /* Host that wrote it has our byte order, and was running
1998 a program using either standard or ss990417 libpcap. */
1999 pcap_opts->cap_pipe_byte_swapped = FALSE;
2000 pcap_opts->cap_pipe_modified = FALSE;
2001 pcap_opts->ts_nsec = magic == PCAP_NSEC_MAGIC;
2003 case PCAP_MODIFIED_MAGIC:
2004 /* Host that wrote it has our byte order, but was running
2005 a program using either ss990915 or ss991029 libpcap. */
2006 pcap_opts->cap_pipe_byte_swapped = FALSE;
2007 pcap_opts->cap_pipe_modified = TRUE;
2009 case PCAP_SWAPPED_MAGIC:
2010 case PCAP_SWAPPED_NSEC_MAGIC:
2011 /* Host that wrote it has a byte order opposite to ours,
2012 and was running a program using either standard or
2013 ss990417 libpcap. */
2014 pcap_opts->cap_pipe_byte_swapped = TRUE;
2015 pcap_opts->cap_pipe_modified = FALSE;
2016 pcap_opts->ts_nsec = magic == PCAP_SWAPPED_NSEC_MAGIC;
2018 case PCAP_SWAPPED_MODIFIED_MAGIC:
2019 /* Host that wrote it out has a byte order opposite to
2020 ours, and was running a program using either ss990915
2021 or ss991029 libpcap. */
2022 pcap_opts->cap_pipe_byte_swapped = TRUE;
2023 pcap_opts->cap_pipe_modified = TRUE;
2026 /* Not a "libpcap" type we know about. */
2027 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
2032 /* Read the rest of the header */
2034 while (bytes_read < sizeof(struct pcap_hdr)) {
2035 sel_ret = cap_pipe_select(fd);
2037 g_snprintf(errmsg, errmsgl,
2038 "Unexpected error from select: %s", g_strerror(errno));
2040 } else if (sel_ret > 0) {
2041 b = read(fd, ((char *)hdr)+bytes_read,
2042 sizeof(struct pcap_hdr) - bytes_read);
2045 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
2047 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
2055 pcap_opts->cap_pipe_buf = (char *) hdr;
2056 pcap_opts->cap_pipe_bytes_read = 0;
2057 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
2058 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2059 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
2060 if (pcap_opts->cap_pipe_bytes_read <= 0) {
2061 if (pcap_opts->cap_pipe_bytes_read == 0)
2062 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
2064 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
2070 if (pcap_opts->cap_pipe_byte_swapped) {
2071 /* Byte-swap the header fields about which we care. */
2072 hdr->version_major = BSWAP16(hdr->version_major);
2073 hdr->version_minor = BSWAP16(hdr->version_minor);
2074 hdr->snaplen = BSWAP32(hdr->snaplen);
2075 hdr->network = BSWAP32(hdr->network);
2077 pcap_opts->linktype = hdr->network;
2079 if (hdr->version_major < 2) {
2080 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
2084 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2085 pcap_opts->cap_pipe_err = PIPOK;
2087 pcap_opts->cap_pipe_fd = fd;
2092 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
2093 pcap_opts->cap_pipe_err = PIPERR;
2096 pcap_opts->cap_pipe_fd = -1;
2103 /* We read one record from the pipe, take care of byte order in the record
2104 * header, write the record to the capture file, and update capture statistics. */
2106 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
2108 struct pcap_pkthdr phdr;
2109 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2112 #if !GLIB_CHECK_VERSION(2,31,18)
2123 #ifdef LOG_CAPTURE_VERBOSE
2124 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2127 switch (pcap_opts->cap_pipe_state) {
2129 case STATE_EXPECT_REC_HDR:
2131 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2134 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2135 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2136 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2137 pcap_opts->cap_pipe_bytes_read = 0;
2140 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2141 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2142 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2147 case STATE_READ_REC_HDR:
2149 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2150 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2153 result = PD_PIPE_EOF;
2155 result = PD_PIPE_ERR;
2158 pcap_opts->cap_pipe_bytes_read += b;
2160 #if GLIB_CHECK_VERSION(2,31,18)
2161 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
2163 g_get_current_time(&wait_time);
2164 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2165 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2167 if (pcap_opts->cap_pipe_err == PIPEOF) {
2168 result = PD_PIPE_EOF;
2170 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2171 result = PD_PIPE_ERR;
2178 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2180 result = PD_REC_HDR_READ;
2183 case STATE_EXPECT_DATA:
2185 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2188 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2189 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2190 pcap_opts->cap_pipe_bytes_read = 0;
2193 pcap_opts->cap_pipe_buf = (char *) data;
2194 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2195 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2200 case STATE_READ_DATA:
2202 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2203 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2206 result = PD_PIPE_EOF;
2208 result = PD_PIPE_ERR;
2211 pcap_opts->cap_pipe_bytes_read += b;
2213 #if GLIB_CHECK_VERSION(2,31,18)
2214 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
2216 g_get_current_time(&wait_time);
2217 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2218 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2220 if (pcap_opts->cap_pipe_err == PIPEOF) {
2221 result = PD_PIPE_EOF;
2223 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2224 result = PD_PIPE_ERR;
2231 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2233 result = PD_DATA_READ;
2237 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2240 } /* switch (pcap_opts->cap_pipe_state) */
2243 * We've now read as much data as we were expecting, so process it.
2247 case PD_REC_HDR_READ:
2248 /* We've read the header. Take care of byte order. */
2249 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2250 &pcap_opts->cap_pipe_rechdr.hdr);
2251 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2252 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2253 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2257 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2258 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2261 /* no data to read? fall through */
2264 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2265 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2266 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2267 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2268 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2271 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2273 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2275 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2279 pcap_opts->cap_pipe_err = PIPEOF;
2284 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2285 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2286 g_snprintf(errmsg, errmsgl,
2287 "Error reading from pipe: %s (error %d)",
2288 utf_16to8(err_str), GetLastError());
2291 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2299 pcap_opts->cap_pipe_err = PIPERR;
2300 /* Return here rather than inside the switch to prevent GCC warning */
2305 /** Open the capture input file (pcap or capture pipe).
2306 * Returns TRUE if it succeeds, FALSE otherwise. */
2308 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2309 char *errmsg, size_t errmsg_len,
2310 char *secondary_errmsg, size_t secondary_errmsg_len)
2312 gchar open_err_str[PCAP_ERRBUF_SIZE];
2313 gchar *sync_msg_str;
2314 interface_options interface_opts;
2315 pcap_options *pcap_opts;
2319 gchar *sync_secondary_msg_str;
2320 WORD wVersionRequested;
2324 /* XXX - opening Winsock on tshark? */
2326 /* Initialize Windows Socket if we are in a WIN32 OS
2327 This needs to be done before querying the interface for network/netmask */
2329 /* XXX - do we really require 1.1 or earlier?
2330 Are there any versions that support only 2.0 or higher? */
2331 wVersionRequested = MAKEWORD(1, 1);
2332 err = WSAStartup(wVersionRequested, &wsaData);
2336 case WSASYSNOTREADY:
2337 g_snprintf(errmsg, (gulong) errmsg_len,
2338 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2341 case WSAVERNOTSUPPORTED:
2342 g_snprintf(errmsg, (gulong) errmsg_len,
2343 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2344 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2347 case WSAEINPROGRESS:
2348 g_snprintf(errmsg, (gulong) errmsg_len,
2349 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2353 g_snprintf(errmsg, (gulong) errmsg_len,
2354 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2358 g_snprintf(errmsg, (gulong) errmsg_len,
2359 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2363 g_snprintf(errmsg, (gulong) errmsg_len,
2364 "Couldn't initialize Windows Sockets: error %d", err);
2367 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2371 if ((use_threads == FALSE) &&
2372 (capture_opts->ifaces->len > 1)) {
2373 g_snprintf(errmsg, (gulong) errmsg_len,
2374 "Using threads is required for capturing on multiple interfaces!");
2378 for (i = 0; i < capture_opts->ifaces->len; i++) {
2379 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2380 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2381 if (pcap_opts == NULL) {
2382 g_snprintf(errmsg, (gulong) errmsg_len,
2383 "Could not allocate memory.");
2386 pcap_opts->received = 0;
2387 pcap_opts->dropped = 0;
2388 pcap_opts->pcap_h = NULL;
2389 #ifdef MUST_DO_SELECT
2390 pcap_opts->pcap_fd = -1;
2392 pcap_opts->pcap_err = FALSE;
2393 pcap_opts->interface_id = i;
2394 pcap_opts->tid = NULL;
2395 pcap_opts->snaplen = 0;
2396 pcap_opts->linktype = -1;
2397 pcap_opts->ts_nsec = FALSE;
2398 pcap_opts->from_cap_pipe = FALSE;
2399 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2400 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2402 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2404 pcap_opts->cap_pipe_fd = -1;
2406 pcap_opts->cap_pipe_modified = FALSE;
2407 pcap_opts->cap_pipe_byte_swapped = FALSE;
2409 pcap_opts->cap_pipe_buf = NULL;
2411 pcap_opts->cap_pipe_bytes_to_read = 0;
2412 pcap_opts->cap_pipe_bytes_read = 0;
2413 pcap_opts->cap_pipe_state = 0;
2414 pcap_opts->cap_pipe_err = PIPOK;
2416 #if GLIB_CHECK_VERSION(2,31,0)
2417 pcap_opts->cap_pipe_read_mtx = g_malloc(sizeof(GMutex));
2418 g_mutex_init(pcap_opts->cap_pipe_read_mtx);
2420 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2422 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2423 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2425 g_array_append_val(ld->pcaps, pcap_opts);
2427 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2428 pcap_opts->pcap_h = open_capture_device(&interface_opts, &open_err_str);
2430 if (pcap_opts->pcap_h != NULL) {
2431 /* we've opened "iface" as a network device */
2433 /* try to set the capture buffer size */
2434 if (interface_opts.buffer_size > 1 &&
2435 pcap_setbuff(pcap_opts->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2436 sync_secondary_msg_str = g_strdup_printf(
2437 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2438 "the default of 1MB will be used.\n"
2440 "Nonetheless, the capture is started.\n",
2441 interface_opts.buffer_size);
2442 report_capture_error("Couldn't set the capture buffer size!",
2443 sync_secondary_msg_str);
2444 g_free(sync_secondary_msg_str);
2448 #if defined(HAVE_PCAP_SETSAMPLING)
2449 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2450 struct pcap_samp *samp;
2452 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2453 switch (interface_opts.sampling_method) {
2454 case CAPTURE_SAMP_BY_COUNT:
2455 samp->method = PCAP_SAMP_1_EVERY_N;
2458 case CAPTURE_SAMP_BY_TIMER:
2459 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2463 sync_msg_str = g_strdup_printf(
2464 "Unknown sampling method %d specified,\n"
2465 "continue without packet sampling",
2466 interface_opts.sampling_method);
2467 report_capture_error("Couldn't set the capture "
2468 "sampling", sync_msg_str);
2469 g_free(sync_msg_str);
2471 samp->value = interface_opts.sampling_param;
2473 report_capture_error("Couldn't set the capture sampling",
2474 "Cannot get packet sampling data structure");
2479 /* setting the data link type only works on real interfaces */
2480 if (!set_pcap_linktype(pcap_opts->pcap_h, interface_opts.linktype, interface_opts.name,
2482 secondary_errmsg, secondary_errmsg_len)) {
2485 pcap_opts->linktype = get_pcap_linktype(pcap_opts->pcap_h, interface_opts.name);
2487 /* We couldn't open "iface" as a network device. */
2488 /* Try to open it as a pipe */
2489 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2492 if (pcap_opts->cap_pipe_fd == -1) {
2494 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2496 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2497 /* Pipe doesn't exist, so output message for interface */
2498 get_capture_device_open_failure_messages(open_err_str,
2499 interface_opts.name,
2503 secondary_errmsg_len);
2506 * Else pipe (or file) does exist and cap_pipe_open_live() has
2511 /* cap_pipe_open_live() succeeded; don't want
2512 error message from pcap_open_live() */
2513 open_err_str[0] = '\0';
2517 /* XXX - will this work for tshark? */
2518 #ifdef MUST_DO_SELECT
2519 if (!pcap_opts->from_cap_pipe) {
2520 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2521 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2523 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2528 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2529 returned a warning; print it, but keep capturing. */
2530 if (open_err_str[0] != '\0') {
2531 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2532 report_capture_error(sync_msg_str, "");
2533 g_free(sync_msg_str);
2535 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2536 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2539 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2540 /* to remove any suid privileges. */
2541 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2542 /* (euid/egid have already previously been set to ruid/rgid. */
2543 /* (See comment in main() for details) */
2545 relinquish_special_privs_perm();
2547 relinquish_all_capabilities();
2552 /* close the capture input file (pcap or capture pipe) */
2553 static void capture_loop_close_input(loop_data *ld)
2556 pcap_options *pcap_opts;
2558 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2560 for (i = 0; i < ld->pcaps->len; i++) {
2561 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2562 /* if open, close the capture pipe "input file" */
2564 if (pcap_opts->cap_pipe_fd >= 0) {
2565 g_assert(pcap_opts->from_cap_pipe);
2566 ws_close(pcap_opts->cap_pipe_fd);
2567 pcap_opts->cap_pipe_fd = -1;
2570 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2571 CloseHandle(pcap_opts->cap_pipe_h);
2572 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2575 /* if open, close the pcap "input file" */
2576 if (pcap_opts->pcap_h != NULL) {
2577 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2578 pcap_close(pcap_opts->pcap_h);
2579 pcap_opts->pcap_h = NULL;
2586 /* Shut down windows sockets */
2592 /* init the capture filter */
2593 static initfilter_status_t
2594 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2595 const gchar * name, const gchar * cfilter)
2597 struct bpf_program fcode;
2599 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2601 /* capture filters only work on real interfaces */
2602 if (cfilter && !from_cap_pipe) {
2603 /* A capture filter was specified; set it up. */
2604 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2605 /* Treat this specially - our caller might try to compile this
2606 as a display filter and, if that succeeds, warn the user that
2607 the display and capture filter syntaxes are different. */
2608 return INITFILTER_BAD_FILTER;
2610 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2611 #ifdef HAVE_PCAP_FREECODE
2612 pcap_freecode(&fcode);
2614 return INITFILTER_OTHER_ERROR;
2616 #ifdef HAVE_PCAP_FREECODE
2617 pcap_freecode(&fcode);
2621 return INITFILTER_NO_ERROR;
2625 /* set up to write to the already-opened capture output file/files */
2627 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2631 pcap_options *pcap_opts;
2632 interface_options interface_opts;
2633 gboolean successful;
2635 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2637 if ((capture_opts->use_pcapng == FALSE) &&
2638 (capture_opts->ifaces->len > 1)) {
2639 g_snprintf(errmsg, errmsg_len,
2640 "Using PCAPNG is required for capturing on multiple interfaces! Use the -n option.");
2644 /* Set up to write to the capture file. */
2645 if (capture_opts->multi_files_on) {
2646 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2648 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2651 if (capture_opts->use_pcapng) {
2653 GString *os_info_str;
2655 os_info_str = g_string_new("");
2656 get_os_version_info(os_info_str);
2658 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2659 successful = libpcap_write_session_header_block(ld->pdh,
2662 os_info_str->str, /* OS*/
2664 -1, /* section_length */
2668 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2669 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2670 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2671 if (pcap_opts->from_cap_pipe) {
2672 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2674 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2676 successful = libpcap_write_interface_description_block(global_ld.pdh,
2677 NULL, /* OPT_COMMENT 1 */
2678 interface_opts.name, /* IDB_NAME 2 */
2679 interface_opts.descr, /* IDB_DESCRIPTION 3 */
2680 interface_opts.cfilter, /* IDB_FILTER 11 */
2681 os_info_str->str, /* IDB_OS 12 */
2682 pcap_opts->linktype,
2684 &(global_ld.bytes_written),
2685 0, /* IDB_IF_SPEED 8 */
2686 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
2690 g_string_free(os_info_str, TRUE);
2693 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2694 if (pcap_opts->from_cap_pipe) {
2695 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2697 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2699 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2700 pcap_opts->ts_nsec, &ld->bytes_written, &err);
2708 if (ld->pdh == NULL) {
2709 /* We couldn't set up to write to the capture file. */
2710 /* XXX - use cf_open_error_message from tshark instead? */
2715 g_snprintf(errmsg, errmsg_len,
2716 "The file to which the capture would be"
2717 " saved (\"%s\") could not be opened: Error %d.",
2718 capture_opts->save_file, err);
2720 g_snprintf(errmsg, errmsg_len,
2721 "The file to which the capture would be"
2722 " saved (\"%s\") could not be opened: %s.",
2723 capture_opts->save_file, g_strerror(err));
2735 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2739 pcap_options *pcap_opts;
2740 guint64 end_time = create_timestamp();
2742 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2744 if (capture_opts->multi_files_on) {
2745 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2747 if (capture_opts->use_pcapng) {
2748 for (i = 0; i < global_ld.pcaps->len; i++) {
2749 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2750 if (!pcap_opts->from_cap_pipe) {
2751 libpcap_write_interface_statistics_block(ld->pdh,
2755 "Counters provided by libpcap",
2762 return libpcap_dump_close(ld->pdh, err_close);
2766 /* dispatch incoming packets (pcap or capture pipe)
2768 * Waits for incoming packets to be available, and calls pcap_dispatch()
2769 * to cause them to be processed.
2771 * Returns the number of packets which were processed.
2773 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2774 * packet-batching behaviour does not cause packets to get held back
2778 capture_loop_dispatch(loop_data *ld,
2779 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2782 gint packet_count_before;
2783 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2788 packet_count_before = ld->packet_count;
2789 if (pcap_opts->from_cap_pipe) {
2790 /* dispatch from capture pipe */
2791 #ifdef LOG_CAPTURE_VERBOSE
2792 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2795 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2797 if (sel_ret < 0 && errno != EINTR) {
2798 g_snprintf(errmsg, errmsg_len,
2799 "Unexpected error from select: %s", g_strerror(errno));
2800 report_capture_error(errmsg, please_report);
2805 * "select()" says we can read from the pipe without blocking
2808 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2818 /* dispatch from pcap */
2819 #ifdef MUST_DO_SELECT
2821 * If we have "pcap_get_selectable_fd()", we use it to get the
2822 * descriptor on which to select; if that's -1, it means there
2823 * is no descriptor on which you can do a "select()" (perhaps
2824 * because you're capturing on a special device, and that device's
2825 * driver unfortunately doesn't support "select()", in which case
2826 * we don't do the select - which means it might not be possible
2827 * to stop a capture until a packet arrives. If that's unacceptable,
2828 * plead with whoever supplies the software for that device to add
2829 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2830 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2831 * later, so it can use pcap_breakloop().
2833 #ifdef LOG_CAPTURE_VERBOSE
2834 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2836 if (pcap_opts->pcap_fd != -1) {
2837 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2840 * "select()" says we can read from it without blocking; go for
2843 * We don't have pcap_breakloop(), so we only process one packet
2844 * per pcap_dispatch() call, to allow a signal to stop the
2845 * processing immediately, rather than processing all packets
2846 * in a batch before quitting.
2849 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2851 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2855 /* Error, rather than pcap_breakloop(). */
2856 pcap_opts->pcap_err = TRUE;
2858 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2861 if (sel_ret < 0 && errno != EINTR) {
2862 g_snprintf(errmsg, errmsg_len,
2863 "Unexpected error from select: %s", g_strerror(errno));
2864 report_capture_error(errmsg, please_report);
2870 #endif /* MUST_DO_SELECT */
2872 /* dispatch from pcap without select */
2874 #ifdef LOG_CAPTURE_VERBOSE
2875 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2879 * On Windows, we don't support asynchronously telling a process to
2880 * stop capturing; instead, we check for an indication on a pipe
2881 * after processing packets. We therefore process only one packet
2882 * at a time, so that we can check the pipe after every packet.
2885 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2887 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2891 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2893 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2898 /* Error, rather than pcap_breakloop(). */
2899 pcap_opts->pcap_err = TRUE;
2901 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2903 #else /* pcap_next_ex */
2904 #ifdef LOG_CAPTURE_VERBOSE
2905 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2907 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2910 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2911 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2912 * This should be fixed in the WinPcap 4.0 alpha release.
2914 * For reference, an example remote interface:
2915 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2918 /* emulate dispatch from pcap */
2921 struct pcap_pkthdr *pkt_header;
2926 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2928 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2930 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2935 pcap_opts->pcap_err = TRUE;
2939 #endif /* pcap_next_ex */
2943 #ifdef LOG_CAPTURE_VERBOSE
2944 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2947 return ld->packet_count - packet_count_before;
2951 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2952 * want to grab only the characters between the '{' and '}' delimiters.
2954 * Returns a GString that must be freed with g_string_free(). */
2956 isolate_uuid(const char *iface)
2961 ptr = strchr(iface, '{');
2963 return g_string_new(iface);
2964 gstr = g_string_new(ptr + 1);
2966 ptr = strchr(gstr->str, '}');
2970 gstr = g_string_truncate(gstr, ptr - gstr->str);
2975 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2976 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2978 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2979 char *errmsg, int errmsg_len)
2982 gchar *capfile_name;
2984 gboolean is_tempfile;
2986 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2987 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2989 if (capture_opts->save_file != NULL) {
2990 /* We return to the caller while the capture is in progress.
2991 * Therefore we need to take a copy of save_file in
2992 * case the caller destroys it after we return.
2994 capfile_name = g_strdup(capture_opts->save_file);
2996 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2997 if (capture_opts->multi_files_on) {
2998 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2999 g_snprintf(errmsg, errmsg_len,
3000 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
3001 g_free(capfile_name);
3004 if (strcmp(capfile_name, "-") == 0) {
3005 /* write to stdout */
3008 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
3009 _setmode(1, O_BINARY);
3012 } /* if (...output_to_pipe ... */
3015 if (capture_opts->multi_files_on) {
3016 /* ringbuffer is enabled */
3017 *save_file_fd = ringbuf_init(capfile_name,
3018 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
3019 capture_opts->group_read_access);
3021 /* we need the ringbuf name */
3022 if(*save_file_fd != -1) {
3023 g_free(capfile_name);
3024 capfile_name = g_strdup(ringbuf_current_filename());
3027 /* Try to open/create the specified file for use as a capture buffer. */
3028 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
3029 (capture_opts->group_read_access) ? 0640 : 0600);
3032 is_tempfile = FALSE;
3034 /* Choose a random name for the temporary capture buffer */
3035 if (global_capture_opts.ifaces->len > 1) {
3036 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
3041 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
3042 basename = g_path_get_basename(iface->str);
3043 g_string_free(iface, TRUE);
3045 basename = g_path_get_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
3047 prefix = g_strconcat("wireshark_", basename, NULL);
3050 *save_file_fd = create_tempfile(&tmpname, prefix);
3052 capfile_name = g_strdup(tmpname);
3056 /* did we fail to open the output file? */
3057 if (*save_file_fd == -1) {
3059 g_snprintf(errmsg, errmsg_len,
3060 "The temporary file to which the capture would be saved (\"%s\") "
3061 "could not be opened: %s.", capfile_name, g_strerror(errno));
3063 if (capture_opts->multi_files_on) {
3064 ringbuf_error_cleanup();
3067 g_snprintf(errmsg, errmsg_len,
3068 "The file to which the capture would be saved (\"%s\") "
3069 "could not be opened: %s.", capfile_name,
3072 g_free(capfile_name);
3076 if(capture_opts->save_file != NULL) {
3077 g_free(capture_opts->save_file);
3079 capture_opts->save_file = capfile_name;
3080 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
3081 "g_free(capfile_name)". */
3087 /* Do the work of handling either the file size or file duration capture
3088 conditions being reached, and switching files or stopping. */
3090 do_file_switch_or_stop(capture_options *capture_opts,
3091 condition *cnd_autostop_files,
3092 condition *cnd_autostop_size,
3093 condition *cnd_file_duration)
3096 pcap_options *pcap_opts;
3097 interface_options interface_opts;
3098 gboolean successful;
3100 if (capture_opts->multi_files_on) {
3101 if (cnd_autostop_files != NULL &&
3102 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
3103 /* no files left: stop here */
3104 global_ld.go = FALSE;
3108 /* Switch to the next ringbuffer file */
3109 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
3110 &global_ld.save_file_fd, &global_ld.err)) {
3112 /* File switch succeeded: reset the conditions */
3113 global_ld.bytes_written = 0;
3114 if (capture_opts->use_pcapng) {
3116 GString *os_info_str;
3118 os_info_str = g_string_new("");
3119 get_os_version_info(os_info_str);
3121 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
3122 successful = libpcap_write_session_header_block(global_ld.pdh,
3125 os_info_str->str, /* OS */
3127 -1, /* section_length */
3128 &(global_ld.bytes_written),
3131 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
3132 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3133 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3134 successful = libpcap_write_interface_description_block(global_ld.pdh,
3135 NULL, /* OPT_COMMENT 1 */
3136 interface_opts.name, /* IDB_NAME 2 */
3137 interface_opts.descr, /* IDB_DESCRIPTION 3 */
3138 interface_opts.cfilter, /* IDB_FILTER 11 */
3139 os_info_str->str, /* IDB_OS 12 */
3140 pcap_opts->linktype,
3142 &(global_ld.bytes_written),
3143 0, /* IDB_IF_SPEED 8 */
3144 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
3148 g_string_free(os_info_str, TRUE);
3151 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3152 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
3153 pcap_opts->ts_nsec, &global_ld.bytes_written, &global_ld.err);
3156 fclose(global_ld.pdh);
3157 global_ld.pdh = NULL;
3158 global_ld.go = FALSE;
3161 if (cnd_autostop_size)
3162 cnd_reset(cnd_autostop_size);
3163 if (cnd_file_duration)
3164 cnd_reset(cnd_file_duration);
3165 libpcap_dump_flush(global_ld.pdh, NULL);
3167 report_packet_count(global_ld.inpkts_to_sync_pipe);
3168 global_ld.inpkts_to_sync_pipe = 0;
3169 report_new_capture_file(capture_opts->save_file);
3171 /* File switch failed: stop here */
3172 global_ld.go = FALSE;
3176 /* single file, stop now */
3177 global_ld.go = FALSE;
3184 pcap_read_handler(void* arg)
3186 pcap_options *pcap_opts;
3187 char errmsg[MSG_MAX_LENGTH+1];
3189 pcap_opts = (pcap_options *)arg;
3191 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
3192 pcap_opts->interface_id);
3194 while (global_ld.go) {
3195 /* dispatch incoming packets */
3196 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
3198 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
3199 pcap_opts->interface_id);
3200 g_thread_exit(NULL);
3204 /* Do the low-level work of a capture.
3205 Returns TRUE if it succeeds, FALSE otherwise. */
3207 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3210 DWORD upd_time, cur_time; /* GetTickCount() returns a "DWORD" (which is 'unsigned long') */
3212 struct timeval upd_time, cur_time;
3216 condition *cnd_file_duration = NULL;
3217 condition *cnd_autostop_files = NULL;
3218 condition *cnd_autostop_size = NULL;
3219 condition *cnd_autostop_duration = NULL;
3222 gboolean cfilter_error = FALSE;
3223 char errmsg[MSG_MAX_LENGTH+1];
3224 char secondary_errmsg[MSG_MAX_LENGTH+1];
3225 pcap_options *pcap_opts;
3226 interface_options interface_opts;
3227 guint i, error_index = 0;
3230 *secondary_errmsg = '\0';
3232 /* init the loop data */
3233 global_ld.go = TRUE;
3234 global_ld.packet_count = 0;
3236 global_ld.report_packet_count = FALSE;
3238 if (capture_opts->has_autostop_packets)
3239 global_ld.packet_max = capture_opts->autostop_packets;
3241 global_ld.packet_max = 0; /* no limit */
3242 global_ld.inpkts_to_sync_pipe = 0;
3243 global_ld.err = 0; /* no error seen yet */
3244 global_ld.pdh = NULL;
3245 global_ld.autostop_files = 0;
3246 global_ld.save_file_fd = -1;
3248 /* We haven't yet gotten the capture statistics. */
3249 *stats_known = FALSE;
3251 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3252 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3254 /* open the "input file" from network interface or capture pipe */
3255 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3256 secondary_errmsg, sizeof(secondary_errmsg))) {
3259 for (i = 0; i < capture_opts->ifaces->len; i++) {
3260 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3261 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3262 /* init the input filter from the network interface (capture pipe will do nothing) */
3264 * When remote capturing WinPCap crashes when the capture filter
3265 * is NULL. This might be a bug in WPCap. Therefore we provide an empty
3268 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3269 interface_opts.name,
3270 interface_opts.cfilter?interface_opts.cfilter:"")) {
3272 case INITFILTER_NO_ERROR:
3275 case INITFILTER_BAD_FILTER:
3276 cfilter_error = TRUE;
3278 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3281 case INITFILTER_OTHER_ERROR:
3282 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3283 pcap_geterr(pcap_opts->pcap_h));
3284 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3289 /* If we're supposed to write to a capture file, open it for output
3290 (temporary/specified name/ringbuffer) */
3291 if (capture_opts->saving_to_file) {
3292 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3293 errmsg, sizeof(errmsg))) {
3297 /* set up to write to the already-opened capture output file/files */
3298 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3303 /* XXX - capture SIGTERM and close the capture, in case we're on a
3304 Linux 2.0[.x] system and you have to explicitly close the capture
3305 stream in order to turn promiscuous mode off? We need to do that
3306 in other places as well - and I don't think that works all the
3307 time in any case, due to libpcap bugs. */
3309 /* Well, we should be able to start capturing.
3311 Sync out the capture file, so the header makes it to the file system,
3312 and send a "capture started successfully and capture file created"
3313 message to our parent so that they'll open the capture file and
3314 update its windows to indicate that we have a live capture in
3316 libpcap_dump_flush(global_ld.pdh, NULL);
3317 report_new_capture_file(capture_opts->save_file);
3320 /* initialize capture stop (and alike) conditions */
3321 init_capture_stop_conditions();
3322 /* create stop conditions */
3323 if (capture_opts->has_autostop_filesize)
3325 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3326 if (capture_opts->has_autostop_duration)
3327 cnd_autostop_duration =
3328 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3330 if (capture_opts->multi_files_on) {
3331 if (capture_opts->has_file_duration)
3333 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3335 if (capture_opts->has_autostop_files)
3336 cnd_autostop_files =
3337 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3340 /* init the time values */
3342 upd_time = GetTickCount();
3344 gettimeofday(&upd_time, NULL);
3346 start_time = create_timestamp();
3347 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3349 /* WOW, everything is prepared! */
3350 /* please fasten your seat belts, we will enter now the actual capture loop */
3352 pcap_queue = g_async_queue_new();
3353 pcap_queue_bytes = 0;
3354 pcap_queue_packets = 0;
3355 for (i = 0; i < global_ld.pcaps->len; i++) {
3356 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3357 #if GLIB_CHECK_VERSION(2,31,0)
3358 /* XXX - Add an interface name here? */
3359 pcap_opts->tid = g_thread_new("Capture read", pcap_read_handler, pcap_opts);
3361 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3365 while (global_ld.go) {
3366 /* dispatch incoming packets */
3368 pcap_queue_element *queue_element;
3369 #if GLIB_CHECK_VERSION(2,31,18)
3371 queue_element = g_async_queue_timeout_pop_unlocked(pcap_queue, WRITER_THREAD_TIMEOUT);
3373 GTimeVal write_thread_time;
3375 g_get_current_time(&write_thread_time);
3376 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3377 g_async_queue_lock(pcap_queue);
3378 queue_element = g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3380 if (queue_element) {
3381 pcap_queue_bytes -= queue_element->phdr.caplen;
3382 pcap_queue_packets -= 1;
3384 g_async_queue_unlock(pcap_queue);
3385 if (queue_element) {
3386 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3387 "Dequeued a packet of length %d captured on interface %d.",
3388 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3390 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3391 &queue_element->phdr,
3393 g_free(queue_element->pd);
3394 g_free(queue_element);
3400 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3401 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3402 sizeof(errmsg), pcap_opts);
3405 /* Were we asked to print packet counts by the SIGINFO handler? */
3406 if (global_ld.report_packet_count) {
3407 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3408 plurality(global_ld.packet_count, "", "s"));
3409 global_ld.report_packet_count = FALSE;
3414 /* any news from our parent (signal pipe)? -> just stop the capture */
3415 if (!signal_pipe_check_running()) {
3416 global_ld.go = FALSE;
3421 global_ld.inpkts_to_sync_pipe += inpkts;
3423 /* check capture size condition */
3424 if (cnd_autostop_size != NULL &&
3425 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3426 /* Capture size limit reached, do we have another file? */
3427 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3428 cnd_autostop_size, cnd_file_duration))
3430 } /* cnd_autostop_size */
3431 if (capture_opts->output_to_pipe) {
3432 libpcap_dump_flush(global_ld.pdh, NULL);
3436 /* Only update once every 500ms so as not to overload slow displays.
3437 * This also prevents too much context-switching between the dumpcap
3438 * and wireshark processes.
3440 #define DUMPCAP_UPD_TIME 500
3443 cur_time = GetTickCount(); /* Note: wraps to 0 if sys runs for 49.7 days */
3444 if ((cur_time - upd_time) > DUMPCAP_UPD_TIME) { /* wrap just causes an extra update */
3446 gettimeofday(&cur_time, NULL);
3447 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3448 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3451 upd_time = cur_time;
3454 if (pcap_stats(pch, stats) >= 0) {
3455 *stats_known = TRUE;
3458 /* Let the parent process know. */
3459 if (global_ld.inpkts_to_sync_pipe) {
3461 libpcap_dump_flush(global_ld.pdh, NULL);
3463 /* Send our parent a message saying we've written out
3464 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3466 report_packet_count(global_ld.inpkts_to_sync_pipe);
3468 global_ld.inpkts_to_sync_pipe = 0;
3471 /* check capture duration condition */
3472 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3473 /* The maximum capture time has elapsed; stop the capture. */
3474 global_ld.go = FALSE;
3478 /* check capture file duration condition */
3479 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3480 /* duration limit reached, do we have another file? */
3481 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3482 cnd_autostop_size, cnd_file_duration))
3484 } /* cnd_file_duration */
3488 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3490 pcap_queue_element *queue_element;
3492 for (i = 0; i < global_ld.pcaps->len; i++) {
3493 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3494 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3495 pcap_opts->interface_id);
3496 g_thread_join(pcap_opts->tid);
3497 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3498 pcap_opts->interface_id);
3501 g_async_queue_lock(pcap_queue);
3502 queue_element = g_async_queue_try_pop_unlocked(pcap_queue);
3503 if (queue_element) {
3504 pcap_queue_bytes -= queue_element->phdr.caplen;
3505 pcap_queue_packets -= 1;
3507 g_async_queue_unlock(pcap_queue);
3508 if (queue_element == NULL) {
3511 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3512 "Dequeued a packet of length %d captured on interface %d.",
3513 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3514 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3515 &queue_element->phdr,
3517 g_free(queue_element->pd);
3518 g_free(queue_element);
3519 global_ld.inpkts_to_sync_pipe += 1;
3520 if (capture_opts->output_to_pipe) {
3521 libpcap_dump_flush(global_ld.pdh, NULL);
3527 /* delete stop conditions */
3528 if (cnd_file_duration != NULL)
3529 cnd_delete(cnd_file_duration);
3530 if (cnd_autostop_files != NULL)
3531 cnd_delete(cnd_autostop_files);
3532 if (cnd_autostop_size != NULL)
3533 cnd_delete(cnd_autostop_size);
3534 if (cnd_autostop_duration != NULL)
3535 cnd_delete(cnd_autostop_duration);
3537 /* did we have a pcap (input) error? */
3538 for (i = 0; i < capture_opts->ifaces->len; i++) {
3539 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3540 if (pcap_opts->pcap_err) {
3541 /* On Linux, if an interface goes down while you're capturing on it,
3542 you'll get a "recvfrom: Network is down" or
3543 "The interface went down" error (ENETDOWN).
3544 (At least you will if g_strerror() doesn't show a local translation
3547 On FreeBSD and OS X, if a network adapter disappears while
3548 you're capturing on it, you'll get a "read: Device not configured"
3549 error (ENXIO). (See previous parenthetical note.)
3551 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3553 These should *not* be reported to the Wireshark developers. */
3556 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3557 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3558 strcmp(cap_err_str, "The interface went down") == 0 ||
3559 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3560 strcmp(cap_err_str, "read: I/O error") == 0 ||
3561 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3562 report_capture_error("The network adapter on which the capture was being done "
3563 "is no longer running; the capture has stopped.",
3566 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3568 report_capture_error(errmsg, please_report);
3571 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3572 report_capture_error(errmsg, "");
3576 /* did we have an output error while capturing? */
3577 if (global_ld.err == 0) {
3580 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3581 global_ld.err, FALSE);
3582 report_capture_error(errmsg, please_report);
3586 if (capture_opts->saving_to_file) {
3587 /* close the output file */
3588 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3592 /* there might be packets not yet notified to the parent */
3593 /* (do this after closing the file, so all packets are already flushed) */
3594 if(global_ld.inpkts_to_sync_pipe) {
3596 report_packet_count(global_ld.inpkts_to_sync_pipe);
3597 global_ld.inpkts_to_sync_pipe = 0;
3600 /* If we've displayed a message about a write error, there's no point
3601 in displaying another message about an error on close. */
3602 if (!close_ok && write_ok) {
3603 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3605 report_capture_error(errmsg, "");
3609 * XXX We exhibit different behaviour between normal mode and sync mode
3610 * when the pipe is stdin and not already at EOF. If we're a child, the
3611 * parent's stdin isn't closed, so if the user starts another capture,
3612 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3613 * will say "Unrecognized libpcap format". On the other hand, in normal
3614 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3617 report_capture_count(TRUE);
3619 /* get packet drop statistics from pcap */
3620 for (i = 0; i < capture_opts->ifaces->len; i++) {
3624 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3625 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3626 received = pcap_opts->received;
3627 dropped = pcap_opts->dropped;
3628 if (pcap_opts->pcap_h != NULL) {
3629 g_assert(!pcap_opts->from_cap_pipe);
3630 /* Get the capture statistics, so we know how many packets were dropped. */
3631 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3632 *stats_known = TRUE;
3633 /* Let the parent process know. */
3634 dropped += stats->ps_drop;
3636 g_snprintf(errmsg, sizeof(errmsg),
3637 "Can't get packet-drop statistics: %s",
3638 pcap_geterr(pcap_opts->pcap_h));
3639 report_capture_error(errmsg, please_report);
3642 report_packet_drops(received, dropped, interface_opts.name);
3645 /* close the input file (pcap or capture pipe) */
3646 capture_loop_close_input(&global_ld);
3648 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3650 /* ok, if the write and the close were successful. */
3651 return write_ok && close_ok;
3654 if (capture_opts->multi_files_on) {
3655 /* cleanup ringbuffer */
3656 ringbuf_error_cleanup();
3658 /* We can't use the save file, and we have no FILE * for the stream
3659 to close in order to close it, so close the FD directly. */
3660 if (global_ld.save_file_fd != -1) {
3661 ws_close(global_ld.save_file_fd);
3664 /* We couldn't even start the capture, so get rid of the capture
3666 if (capture_opts->save_file != NULL) {
3667 ws_unlink(capture_opts->save_file);
3668 g_free(capture_opts->save_file);
3671 capture_opts->save_file = NULL;
3673 report_cfilter_error(capture_opts, error_index, errmsg);
3675 report_capture_error(errmsg, secondary_errmsg);
3677 /* close the input file (pcap or cap_pipe) */
3678 capture_loop_close_input(&global_ld);
3680 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3686 static void capture_loop_stop(void)
3688 #ifdef HAVE_PCAP_BREAKLOOP
3690 pcap_options *pcap_opts;
3692 for (i = 0; i < global_ld.pcaps->len; i++) {
3693 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3694 if (pcap_opts->pcap_h != NULL)
3695 pcap_breakloop(pcap_opts->pcap_h);
3698 global_ld.go = FALSE;
3703 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3704 int err, gboolean is_close)
3709 g_snprintf(errmsg, errmsglen,
3710 "Not all the packets could be written to the file"
3711 " to which the capture was being saved\n"
3712 "(\"%s\") because there is no space left on the file system\n"
3713 "on which that file resides.",
3719 g_snprintf(errmsg, errmsglen,
3720 "Not all the packets could be written to the file"
3721 " to which the capture was being saved\n"
3722 "(\"%s\") because you are too close to, or over,"
3723 " your disk quota\n"
3724 "on the file system on which that file resides.",
3731 g_snprintf(errmsg, errmsglen,
3732 "The file to which the capture was being saved\n"
3733 "(\"%s\") could not be closed: %s.",
3734 fname, g_strerror(err));
3736 g_snprintf(errmsg, errmsglen,
3737 "An error occurred while writing to the file"
3738 " to which the capture was being saved\n"
3740 fname, g_strerror(err));
3747 /* one packet was captured, process it */
3749 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3752 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3754 guint ts_mul = pcap_opts->ts_nsec ? 1000000000 : 1000000;
3756 /* We may be called multiple times from pcap_dispatch(); if we've set
3757 the "stop capturing" flag, ignore this packet, as we're not
3758 supposed to be saving any more packets. */
3762 if (global_ld.pdh) {
3763 gboolean successful;
3765 /* We're supposed to write the packet to a file; do so.
3766 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3767 "ld->err" to the error. */
3768 if (global_capture_opts.use_pcapng) {
3769 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, pcap_opts->interface_id, ts_mul, pd, &global_ld.bytes_written, &err);
3771 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3774 global_ld.go = FALSE;
3775 global_ld.err = err;
3777 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3778 "Wrote a packet of length %d captured on interface %u.",
3779 phdr->caplen, pcap_opts->interface_id);
3780 global_ld.packet_count++;
3781 pcap_opts->received++;
3782 /* if the user told us to stop after x packets, do we already have enough? */
3783 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3784 global_ld.go = FALSE;
3790 /* one packet was captured, queue it */
3792 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3795 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3796 pcap_queue_element *queue_element;
3797 gboolean limit_reached;
3799 /* We may be called multiple times from pcap_dispatch(); if we've set
3800 the "stop capturing" flag, ignore this packet, as we're not
3801 supposed to be saving any more packets. */
3805 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3806 if (queue_element == NULL) {
3807 pcap_opts->dropped++;
3810 queue_element->pcap_opts = pcap_opts;
3811 queue_element->phdr = *phdr;
3812 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3813 if (queue_element->pd == NULL) {
3814 pcap_opts->dropped++;
3815 g_free(queue_element);
3818 memcpy(queue_element->pd, pd, phdr->caplen);
3819 g_async_queue_lock(pcap_queue);
3820 if (((pcap_queue_byte_limit > 0) && (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3821 ((pcap_queue_packet_limit > 0) && (pcap_queue_packets < pcap_queue_packet_limit))) {
3822 limit_reached = FALSE;
3823 g_async_queue_push_unlocked(pcap_queue, queue_element);
3824 pcap_queue_bytes += phdr->caplen;
3825 pcap_queue_packets += 1;
3827 limit_reached = TRUE;
3829 g_async_queue_unlock(pcap_queue);
3830 if (limit_reached) {
3831 pcap_opts->dropped++;
3832 g_free(queue_element->pd);
3833 g_free(queue_element);
3834 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3835 "Dropped a packet of length %d captured on interface %u.",
3836 phdr->caplen, pcap_opts->interface_id);
3838 pcap_opts->received++;
3839 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3840 "Queued a packet of length %d captured on interface %u.",
3841 phdr->caplen, pcap_opts->interface_id);
3843 /* I don't want to hold the mutex over the debug output. So the
3844 output may be wrong */
3845 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3846 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3847 pcap_queue_bytes, pcap_queue_packets);
3850 /* And now our feature presentation... [ fade to music ] */
3852 main(int argc, char *argv[])
3855 gboolean arg_error = FALSE;
3860 struct sigaction action, oldaction;
3863 gboolean start_capture = TRUE;
3864 gboolean stats_known;
3865 struct pcap_stat stats;
3866 GLogLevelFlags log_flags;
3867 gboolean list_interfaces = FALSE;
3868 gboolean list_link_layer_types = FALSE;
3869 #ifdef HAVE_BPF_IMAGE
3870 gboolean print_bpf_code = FALSE;
3872 gboolean machine_readable = FALSE;
3873 gboolean print_statistics = FALSE;
3874 int status, run_once_args = 0;
3877 #if defined(__APPLE__) && defined(__LP64__)
3878 struct utsname osinfo;
3883 arg_list_utf_16to8(argc, argv);
3888 * Initialize our DLL search path. MUST be called before LoadLibrary
3891 ws_init_dll_search_path();
3894 #ifdef HAVE_PCAP_REMOTE
3895 #define OPTSTRING_A "A:"
3896 #define OPTSTRING_r "r"
3897 #define OPTSTRING_u "u"
3899 #define OPTSTRING_A ""
3900 #define OPTSTRING_r ""
3901 #define OPTSTRING_u ""
3904 #ifdef HAVE_PCAP_SETSAMPLING
3905 #define OPTSTRING_m "m:"
3907 #define OPTSTRING_m ""
3910 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3911 #define OPTSTRING_B "B:"
3913 #define OPTSTRING_B ""
3914 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3916 #ifdef HAVE_PCAP_CREATE
3917 #define OPTSTRING_I "I"
3919 #define OPTSTRING_I ""
3922 #ifdef HAVE_BPF_IMAGE
3923 #define OPTSTRING_d "d"
3925 #define OPTSTRING_d ""
3928 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "L" OPTSTRING_m "MnpPq" OPTSTRING_r "Ss:t" OPTSTRING_u "vw:y:Z:"
3930 #ifdef DEBUG_CHILD_DUMPCAP
3931 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3932 fprintf (stderr, "Unable to open debug log file !\n");
3937 #if defined(__APPLE__) && defined(__LP64__)
3939 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3940 * a bug workaround - timeouts less than 1 second don't work with libpcap
3941 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3942 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3943 * The problem is extremely unlikely to be reintroduced in a future
3946 if (uname(&osinfo) == 0) {
3948 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3949 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3950 * number of 10.0.0, not 10.1.0 - go figure).
3952 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3953 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3954 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3955 need_timeout_workaround = TRUE;
3960 * Determine if dumpcap is being requested to run in a special
3961 * capture_child mode by going thru the command line args to see if
3962 * a -Z is present. (-Z is a hidden option).
3964 * The primary result of running in capture_child mode is that
3965 * all messages sent out on stderr are in a special type/len/string
3966 * format to allow message processing by type. These messages include
3967 * error messages if dumpcap fails to start the operation it was
3968 * requested to do, as well as various "status" messages which are sent
3969 * when an actual capture is in progress, and a "success" message sent
3970 * if dumpcap was requested to perform an operation other than a
3973 * Capture_child mode would normally be requested by a parent process
3974 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3975 * to which dumpcap stderr has been redirected. It might also have
3976 * another pipe to obtain dumpcap stdout output; for operations other
3977 * than a capture, that information is formatted specially for easier
3978 * parsing by the parent process.
3980 * Capture_child mode needs to be determined immediately upon
3981 * startup so that any messages generated by dumpcap in this mode
3982 * (eg: during initialization) will be formatted properly.
3985 for (i=1; i<argc; i++) {
3986 if (strcmp("-Z", argv[i]) == 0) {
3987 capture_child = TRUE;
3988 machine_readable = TRUE; /* request machine-readable output */
3990 /* set output pipe to binary mode, to avoid ugly text conversions */
3991 _setmode(2, O_BINARY);
3996 /* The default_log_handler will use stdout, which makes trouble in */
3997 /* capture child mode, as it uses stdout for it's sync_pipe. */
3998 /* So: the filtering is done in the console_log_handler and not here.*/
3999 /* We set the log handlers right up front to make sure that any log */
4000 /* messages when running as child will be sent back to the parent */
4001 /* with the correct format. */
4005 G_LOG_LEVEL_CRITICAL|
4006 G_LOG_LEVEL_WARNING|
4007 G_LOG_LEVEL_MESSAGE|
4010 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
4012 g_log_set_handler(NULL,
4014 console_log_handler, NULL /* user_data */);
4015 g_log_set_handler(LOG_DOMAIN_MAIN,
4017 console_log_handler, NULL /* user_data */);
4018 g_log_set_handler(LOG_DOMAIN_CAPTURE,
4020 console_log_handler, NULL /* user_data */);
4021 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
4023 console_log_handler, NULL /* user_data */);
4025 /* Initialize the pcaps list */
4026 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
4028 #if !GLIB_CHECK_VERSION(2,31,0)
4029 /* Initialize the thread system */
4030 g_thread_init(NULL);
4034 /* Load wpcap if possible. Do this before collecting the run-time version information */
4037 /* ... and also load the packet.dll from wpcap */
4038 /* XXX - currently not required, may change later. */
4039 /*wpcap_packet_load();*/
4041 /* Start windows sockets */
4042 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
4044 /* Set handler for Ctrl+C key */
4045 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
4047 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
4049 action.sa_handler = capture_cleanup_handler;
4051 * Arrange that system calls not get restarted, because when
4052 * our signal handler returns we don't want to restart
4053 * a call that was waiting for packets to arrive.
4055 action.sa_flags = 0;
4056 sigemptyset(&action.sa_mask);
4057 sigaction(SIGTERM, &action, NULL);
4058 sigaction(SIGINT, &action, NULL);
4059 sigaction(SIGPIPE, &action, NULL);
4060 sigaction(SIGHUP, NULL, &oldaction);
4061 if (oldaction.sa_handler == SIG_DFL)
4062 sigaction(SIGHUP, &action, NULL);
4065 /* Catch SIGINFO and, if we get it and we're capturing in
4066 quiet mode, report the number of packets we've captured. */
4067 action.sa_handler = report_counts_siginfo;
4068 action.sa_flags = SA_RESTART;
4069 sigemptyset(&action.sa_mask);
4070 sigaction(SIGINFO, &action, NULL);
4071 #endif /* SIGINFO */
4074 /* ----------------------------------------------------------------- */
4075 /* Privilege and capability handling */
4077 /* 1. Running not as root or suid root; no special capabilities. */
4080 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
4083 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
4085 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4086 /* capabilities; Drop all other capabilities; */
4087 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4088 /* else: after pcap_open_live() in capture_loop_open_input() */
4089 /* drop all capabilities (NET_RAW and NET_ADMIN); */
4090 /* (Note: this means that the process, although logged in */
4091 /* as root, does not have various permissions such as the */
4092 /* ability to bypass file access permissions). */
4093 /* XXX: Should we just leave capabilities alone in this case */
4094 /* so that user gets expected effect that root can do */
4097 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
4099 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4100 /* else: after pcap_open_live() in capture_loop_open_input() */
4101 /* drop suid root (set euid=ruid).(ie: keep suid until after */
4102 /* pcap_open_live). */
4104 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
4106 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4107 /* capabilities; Drop all other capabilities; */
4108 /* Drop suid privileges (euid=ruid); */
4109 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4110 /* else: after pcap_open_live() in capture_loop_open_input() */
4111 /* drop all capabilities (NET_RAW and NET_ADMIN). */
4113 /* XXX: For some Linux versions/distros with capabilities */
4114 /* a 'normal' process with any capabilities cannot be */
4115 /* 'killed' (signaled) from another (same uid) non-privileged */
4117 /* For example: If (non-suid) Wireshark forks a */
4118 /* child suid dumpcap which acts as described here (case 5), */
4119 /* Wireshark will be unable to kill (signal) the child */
4120 /* dumpcap process until the capabilities have been dropped */
4121 /* (after pcap_open_live()). */
4122 /* This behaviour will apparently be changed in the kernel */
4123 /* to allow the kill (signal) in this case. */
4124 /* See the following for details: */
4125 /* http://www.mail-archive.com/ [wrapped] */
4126 /* linux-security-module@vger.kernel.org/msg02913.html */
4128 /* It is therefore conceivable that if dumpcap somehow hangs */
4129 /* in pcap_open_live or before that wireshark will not */
4130 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
4131 /* In this case, exiting wireshark will kill the child */
4132 /* dumpcap process. */
4134 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
4135 /* capabilities; Using libcap. Note: capset cmd (which see) */
4136 /* used to assign capabilities to file. */
4138 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4139 /* else: after pcap_open_live() in capture_loop_open_input() */
4140 /* drop all capabilities (NET_RAW and NET_ADMIN) */
4142 /* ToDo: -S (stats) should drop privileges/capabilities when no */
4143 /* longer required (similar to capture). */
4145 /* ----------------------------------------------------------------- */
4147 init_process_policies();
4150 /* If 'started with special privileges' (and using libcap) */
4151 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
4152 /* Set euid/egid = ruid/rgid to remove suid privileges */
4153 relinquish_privs_except_capture();
4156 /* Set the initial values in the capture options. This might be overwritten
4157 by the command line parameters. */
4158 capture_opts_init(&global_capture_opts, NULL);
4160 /* We always save to a file - if no file was specified, we save to a
4162 global_capture_opts.saving_to_file = TRUE;
4163 global_capture_opts.has_ring_num_files = TRUE;
4165 /* Now get our args */
4166 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
4168 case 'h': /* Print help and exit */
4172 case 'v': /* Show version and exit */
4174 GString *comp_info_str;
4175 GString *runtime_info_str;
4176 /* Assemble the compile-time version information string */
4177 comp_info_str = g_string_new("Compiled ");
4178 get_compiled_version_info(comp_info_str, NULL, NULL);
4180 /* Assemble the run-time version information string */
4181 runtime_info_str = g_string_new("Running ");
4182 get_runtime_version_info(runtime_info_str, NULL);
4183 show_version(comp_info_str, runtime_info_str);
4184 g_string_free(comp_info_str, TRUE);
4185 g_string_free(runtime_info_str, TRUE);
4189 /*** capture option specific ***/
4190 case 'a': /* autostop criteria */
4191 case 'b': /* Ringbuffer option */
4192 case 'c': /* Capture x packets */
4193 case 'f': /* capture filter */
4194 case 'i': /* Use interface x */
4195 case 'n': /* Use pcapng format */
4196 case 'p': /* Don't capture in promiscuous mode */
4197 case 'P': /* Use pcap format */
4198 case 's': /* Set the snapshot (capture) length */
4199 case 'w': /* Write to capture file x */
4200 case 'g': /* enable group read accesson file(s) */
4201 case 'y': /* Set the pcap data link type */
4202 #ifdef HAVE_PCAP_REMOTE
4203 case 'u': /* Use UDP for data transfer */
4204 case 'r': /* Capture own RPCAP traffic too */
4205 case 'A': /* Authentication */
4207 #ifdef HAVE_PCAP_SETSAMPLING
4208 case 'm': /* Sampling */
4210 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4211 case 'B': /* Buffer size */
4212 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4213 #ifdef HAVE_PCAP_CREATE
4214 case 'I': /* Monitor mode */
4216 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4221 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4223 capture_child = TRUE;
4225 /* set output pipe to binary mode, to avoid ugly text conversions */
4226 _setmode(2, O_BINARY);
4228 * optarg = the control ID, aka the PPID, currently used for the
4231 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4232 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4233 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4234 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4236 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4237 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4238 "Signal pipe: Unable to open %s. Dead parent?",
4246 case 'q': /* Quiet */
4252 /*** all non capture option specific ***/
4253 case 'D': /* Print a list of capture devices and exit */
4254 list_interfaces = TRUE;
4257 case 'L': /* Print list of link-layer types and exit */
4258 list_link_layer_types = TRUE;
4261 #ifdef HAVE_BPF_IMAGE
4262 case 'd': /* Print BPF code for capture filter and exit */
4263 print_bpf_code = TRUE;
4267 case 'S': /* Print interface statistics once a second */
4268 print_statistics = TRUE;
4271 case 'M': /* For -D, -L, and -S, print machine-readable output */
4272 machine_readable = TRUE;
4275 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4277 case '?': /* Bad flag - print usage message */
4286 /* user specified file name as regular command-line argument */
4287 /* XXX - use it as the capture file name (or something else)? */
4293 * Extra command line arguments were specified; complain.
4294 * XXX - interpret as capture filter, as tcpdump and tshark do?
4296 cmdarg_err("Invalid argument: %s", argv[0]);
4306 if (run_once_args > 1) {
4307 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4309 } else if (run_once_args == 1) {
4310 /* We're supposed to print some information, rather than
4311 to capture traffic; did they specify a ring buffer option? */
4312 if (global_capture_opts.multi_files_on) {
4313 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4317 /* We're supposed to capture traffic; */
4318 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4319 if (global_capture_opts.ifaces->len > 1) {
4321 global_capture_opts.use_pcapng = TRUE;
4323 /* Was the ring buffer option specified and, if so, does it make sense? */
4324 if (global_capture_opts.multi_files_on) {
4325 /* Ring buffer works only under certain conditions:
4326 a) ring buffer does not work with temporary files;
4327 b) it makes no sense to enable the ring buffer if the maximum
4328 file size is set to "infinite". */
4329 if (global_capture_opts.save_file == NULL) {
4330 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4331 global_capture_opts.multi_files_on = FALSE;
4333 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4334 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4336 /* XXX - this must be redesigned as the conditions changed */
4337 global_capture_opts.multi_files_on = FALSE;
4344 * "-D" requires no interface to be selected; it's supposed to list
4347 if (list_interfaces) {
4348 /* Get the list of interfaces */
4353 if_list = capture_interface_list(&err, &err_str);
4354 if (if_list == NULL) {
4356 case CANT_GET_INTERFACE_LIST:
4357 case DONT_HAVE_PCAP:
4358 cmdarg_err("%s", err_str);
4363 case NO_INTERFACES_FOUND:
4365 * If we're being run by another program, just give them
4366 * an empty list of interfaces, don't report this as
4367 * an error; that lets them decide whether to report
4368 * this as an error or not.
4370 if (!machine_readable) {
4371 cmdarg_err("There are no interfaces on which a capture can be done");
4378 if (machine_readable) /* tab-separated values to stdout */
4379 print_machine_readable_interfaces(if_list);
4381 capture_opts_print_interfaces(if_list);
4382 free_interface_list(if_list);
4387 * "-S" requires no interface to be selected; it gives statistics
4388 * for all interfaces.
4390 if (print_statistics) {
4391 status = print_statistics_loop(machine_readable);
4396 * "-L", "-d", and capturing act on a particular interface, so we have to
4397 * have an interface; if none was specified, pick a default.
4399 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4400 /* cmdarg_err() already called .... */
4404 /* Let the user know what interfaces were chosen. */
4405 /* get_interface_descriptive_name() is not available! */
4406 if (capture_child) {
4407 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4408 interface_options interface_opts;
4410 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4411 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n",
4412 interface_opts.name);
4415 str = g_string_new("");
4417 if (global_capture_opts.ifaces->len < 2) {
4419 if (global_capture_opts.ifaces->len < 4) {
4421 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4422 interface_options interface_opts;
4424 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4426 if (global_capture_opts.ifaces->len > 2) {
4427 g_string_append_printf(str, ",");
4429 g_string_append_printf(str, " ");
4430 if (j == global_capture_opts.ifaces->len - 1) {
4431 g_string_append_printf(str, "and ");
4434 g_string_append_printf(str, "%s", interface_opts.name);
4437 g_string_append_printf(str, "%u interfaces", global_capture_opts.ifaces->len);
4439 fprintf(stderr, "Capturing on %s\n", str->str);
4440 g_string_free(str, TRUE);
4443 if (list_link_layer_types) {
4444 /* Get the list of link-layer types for the capture device. */
4445 if_capabilities_t *caps;
4449 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4450 interface_options interface_opts;
4452 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4453 caps = get_if_capabilities(interface_opts.name,
4454 interface_opts.monitor_mode, &err_str);
4456 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4457 "Please check to make sure you have sufficient permissions, and that\n"
4458 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4462 if (caps->data_link_types == NULL) {
4463 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4466 if (machine_readable) /* tab-separated values to stdout */
4467 /* XXX: We need to change the format and adopt consumers */
4468 print_machine_readable_if_capabilities(caps);
4470 /* XXX: We might want to print also the interface name */
4471 capture_opts_print_if_capabilities(caps, interface_opts.name,
4472 interface_opts.monitor_mode);
4473 free_if_capabilities(caps);
4478 /* We're supposed to do a capture, or print the BPF code for a filter.
4479 Process the snapshot length, as that affects the generated BPF code. */
4480 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4482 #ifdef HAVE_BPF_IMAGE
4483 if (print_bpf_code) {
4484 show_filter_code(&global_capture_opts);
4489 /* We're supposed to do a capture. Process the ring buffer arguments. */
4490 capture_opts_trim_ring_num_files(&global_capture_opts);
4492 /* Now start the capture. */
4494 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4498 /* capture failed */
4501 return 0; /* never here, make compiler happy */
4506 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4507 const char *message, gpointer user_data _U_)
4514 /* ignore log message, if log_level isn't interesting */
4515 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4516 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4521 /* create a "timestamp" */
4523 today = localtime(&curr);
4525 switch(log_level & G_LOG_LEVEL_MASK) {
4526 case G_LOG_LEVEL_ERROR:
4529 case G_LOG_LEVEL_CRITICAL:
4532 case G_LOG_LEVEL_WARNING:
4535 case G_LOG_LEVEL_MESSAGE:
4538 case G_LOG_LEVEL_INFO:
4541 case G_LOG_LEVEL_DEBUG:
4545 fprintf(stderr, "unknown log_level %u\n", log_level);
4547 g_assert_not_reached();
4550 /* Generate the output message */
4551 if(log_level & G_LOG_LEVEL_MESSAGE) {
4552 /* normal user messages without additional infos */
4553 msg = g_strdup_printf("%s\n", message);
4555 /* info/debug messages with additional infos */
4556 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4557 today->tm_hour, today->tm_min, today->tm_sec,
4558 log_domain != NULL ? log_domain : "",
4562 /* DEBUG & INFO msgs (if we're debugging today) */
4563 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4564 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4565 #ifdef DEBUG_DUMPCAP
4566 fprintf(stderr, "%s", msg);
4569 #ifdef DEBUG_CHILD_DUMPCAP
4570 fprintf(debug_log, "%s", msg);
4578 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4579 /* to parent especially formatted if dumpcap running as child. */
4580 if (capture_child) {
4581 sync_pipe_errmsg_to_parent(2, msg, "");
4583 fprintf(stderr, "%s", msg);
4590 /****************************************************************************************************************/
4591 /* indication report routines */
4595 report_packet_count(int packet_count)
4597 char tmp[SP_DECISIZE+1+1];
4598 static int count = 0;
4601 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4602 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4603 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4605 count += packet_count;
4606 fprintf(stderr, "\rPackets: %u ", count);
4607 /* stderr could be line buffered */
4613 report_new_capture_file(const char *filename)
4616 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4617 pipe_write_block(2, SP_FILE, filename);
4621 * Prevent a SIGINFO handler from writing to the standard error
4622 * while we're doing so; instead, have it just set a flag telling
4623 * us to print that information when we're done.
4626 #endif /* SIGINFO */
4627 fprintf(stderr, "File: %s\n", filename);
4628 /* stderr could be line buffered */
4633 * Allow SIGINFO handlers to write.
4638 * If a SIGINFO handler asked us to write out capture counts, do so.
4641 report_counts_for_siginfo();
4642 #endif /* SIGINFO */
4647 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4649 interface_options interface_opts;
4650 char tmp[MSG_MAX_LENGTH+1+6];
4652 if (i < capture_opts->ifaces->len) {
4653 if (capture_child) {
4654 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4655 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4656 pipe_write_block(2, SP_BAD_FILTER, tmp);
4659 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4660 * the error message below.
4662 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4664 "Invalid capture filter: \"%s\" for interface %s!\n"
4666 "That string isn't a valid capture filter (%s).\n"
4667 "See the User's Guide for a description of the capture filter syntax.",
4668 interface_opts.cfilter, interface_opts.name, errmsg);
4674 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4677 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4678 "Primary Error: %s", error_msg);
4679 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4680 "Secondary Error: %s", secondary_error_msg);
4681 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4683 cmdarg_err("%s", error_msg);
4684 if (secondary_error_msg[0] != '\0')
4685 cmdarg_err_cont("%s", secondary_error_msg);
4690 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4692 char tmp[SP_DECISIZE+1+1];
4694 g_snprintf(tmp, sizeof(tmp), "%u", drops);
4697 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4698 "Packets received/dropped on interface %s: %u/%u",
4699 name, received, drops);
4700 /* XXX: Need to provide interface id, changes to consumers required. */
4701 pipe_write_block(2, SP_DROPS, tmp);
4704 "Packets received/dropped on interface %s: %u/%u (%.1f%%)\n",
4705 name, received, drops,
4706 received ? 100.0 * received / (received + drops) : 0.0);
4707 /* stderr could be line buffered */
4713 /****************************************************************************************************************/
4714 /* signal_pipe handling */
4719 signal_pipe_check_running(void)
4721 /* any news from our parent? -> just stop the capture */
4725 /* if we are running standalone, no check required */
4726 if(!capture_child) {
4730 if(!sig_pipe_name || !sig_pipe_handle) {
4731 /* This shouldn't happen */
4732 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4733 "Signal pipe: No name or handle");
4738 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4739 * at this point. Should we check to see if the parent is still alive,
4740 * e.g. by using OpenProcess?
4743 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4745 if(!result || avail > 0) {
4746 /* peek failed or some bytes really available */
4747 /* (if not piping from stdin this would fail) */
4748 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4749 "Signal pipe: Stop capture: %s", sig_pipe_name);
4750 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4751 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4752 sig_pipe_handle, result, avail);
4755 /* pipe ok and no bytes available */
4762 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4767 * indent-tabs-mode: nil
4770 * vi: set shiftwidth=4 tabstop=8 expandtab:
4771 * :indentSize=4:tabSize=8:noTabs=true: