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 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
641 "pcap_open() returned %p.", (void *)pcap_h);
646 * If we're not opening a remote device, use pcap_create() and
647 * pcap_activate() if we have them, so that we can set the buffer
648 * size, otherwise use pcap_open_live().
650 #ifdef HAVE_PCAP_CREATE
651 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
652 "Calling pcap_create() using %s.", interface_opts->name);
653 pcap_h = pcap_create(interface_opts->name, *open_err_str);
654 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
655 "pcap_create() returned %p.", (void *)pcap_h);
656 if (pcap_h != NULL) {
657 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
658 "Calling pcap_set_snaplen() with snaplen %d.", interface_opts->snaplen);
659 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
660 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
661 "Calling pcap_set_promisc() with promisc_mode %d.", interface_opts->promisc_mode);
662 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
663 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
665 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
666 "buffersize %d.", interface_opts->buffer_size);
667 if (interface_opts->buffer_size > 1) {
668 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
670 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
671 "monitor_mode %d.", interface_opts->monitor_mode);
672 if (interface_opts->monitor_mode)
673 pcap_set_rfmon(pcap_h, 1);
674 err = pcap_activate(pcap_h);
675 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
676 "pcap_activate() returned %d.", err);
678 /* Failed to activate, set to NULL */
679 if (err == PCAP_ERROR)
680 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
682 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
688 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
689 "pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
690 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode);
691 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
692 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
694 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
695 "pcap_open_live() returned %p.", (void *)pcap_h);
698 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
703 get_capture_device_open_failure_messages(const char *open_err_str,
709 char *errmsg, size_t errmsg_len,
710 char *secondary_errmsg,
711 size_t secondary_errmsg_len)
713 const char *libpcap_warn;
714 static const char ppamsg[] = "can't find PPA for ";
716 /* If we got a "can't find PPA for X" message, warn the user (who
717 is running dumpcap on HP-UX) that they don't have a version of
718 libpcap that properly handles HP-UX (libpcap 0.6.x and later
719 versions, which properly handle HP-UX, say "can't find /dev/dlpi
720 PPA for X" rather than "can't find PPA for X"). */
721 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
724 "You are running (T)Wireshark with a version of the libpcap library\n"
725 "that doesn't handle HP-UX network devices well; this means that\n"
726 "(T)Wireshark may not be able to capture packets.\n"
728 "To fix this, you should install libpcap 0.6.2, or a later version\n"
729 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
730 "packaged binary form from the Software Porting And Archive Centre\n"
731 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
732 "at the URL lists a number of mirror sites.";
735 g_snprintf(errmsg, (gulong) errmsg_len,
736 "The capture session could not be initiated (%s).", open_err_str);
739 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
741 "In order to capture packets, WinPcap must be installed; see\n"
743 " http://www.winpcap.org/\n"
747 " http://www.mirrors.wiretapped.net/security/packet-capture/winpcap/\n"
751 " http://winpcap.cs.pu.edu.tw/\n"
753 "for a downloadable version of WinPcap and for instructions on how to install\n"
756 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
758 "Please check that \"%s\" is the proper interface.\n"
761 "Help can be found at:\n"
763 " http://wiki.wireshark.org/WinPcap\n"
764 " http://wiki.wireshark.org/CaptureSetup\n",
768 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
769 "Please check to make sure you have sufficient permissions, and that you have "
770 "the proper interface or pipe specified.%s", libpcap_warn);
774 /* Set the data link type on a pcap. */
776 set_pcap_linktype(pcap_t *pcap_h, int linktype,
777 #ifdef HAVE_PCAP_SET_DATALINK
782 char *errmsg, size_t errmsg_len,
783 char *secondary_errmsg, size_t secondary_errmsg_len)
785 char *set_linktype_err_str;
788 return TRUE; /* just use the default */
789 #ifdef HAVE_PCAP_SET_DATALINK
790 if (pcap_set_datalink(pcap_h, linktype) == 0)
791 return TRUE; /* no error */
792 set_linktype_err_str = pcap_geterr(pcap_h);
794 /* Let them set it to the type it is; reject any other request. */
795 if (get_pcap_linktype(pcap_h, name) == linktype)
796 return TRUE; /* no error */
797 set_linktype_err_str =
798 "That DLT isn't one of the DLTs supported by this device";
800 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
801 set_linktype_err_str);
803 * If the error isn't "XXX is not one of the DLTs supported by this device",
804 * tell the user to tell the Wireshark developers about it.
806 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
807 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
809 secondary_errmsg[0] = '\0';
814 compile_capture_filter(const char *iface, pcap_t *pcap_h,
815 struct bpf_program *fcode, const char *cfilter)
817 bpf_u_int32 netnum, netmask;
818 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
820 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
822 * Well, we can't get the netmask for this interface; it's used
823 * only for filters that check for broadcast IP addresses, so
824 * we just punt and use 0. It might be nice to warn the user,
825 * but that's a pain in a GUI application, as it'd involve popping
826 * up a message box, and it's not clear how often this would make
827 * a difference (only filters that check for IP broadcast addresses
831 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
836 * Sigh. Older versions of libpcap don't properly declare the
837 * third argument to pcap_compile() as a const pointer. Cast
840 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
845 #ifdef HAVE_BPF_IMAGE
847 show_filter_code(capture_options *capture_opts)
849 interface_options interface_opts;
851 gchar open_err_str[PCAP_ERRBUF_SIZE];
852 char errmsg[MSG_MAX_LENGTH+1];
853 char secondary_errmsg[MSG_MAX_LENGTH+1];
854 struct bpf_program fcode;
855 struct bpf_insn *insn;
859 for (j = 0; j < capture_opts->ifaces->len; j++) {
860 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
861 pcap_h = open_capture_device(&interface_opts, &open_err_str);
862 if (pcap_h == NULL) {
863 /* Open failed; get messages */
864 get_capture_device_open_failure_messages(open_err_str,
866 errmsg, sizeof errmsg,
868 sizeof secondary_errmsg);
869 /* And report them */
870 report_capture_error(errmsg, secondary_errmsg);
874 /* Set the link-layer type. */
875 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
876 errmsg, sizeof errmsg,
877 secondary_errmsg, sizeof secondary_errmsg)) {
879 report_capture_error(errmsg, secondary_errmsg);
883 /* OK, try to compile the capture filter. */
884 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
885 interface_opts.cfilter)) {
887 report_cfilter_error(capture_opts, j, errmsg);
892 /* Now print the filter code. */
893 insn = fcode.bf_insns;
895 for (i = 0; i < fcode.bf_len; insn++, i++)
896 printf("%s\n", bpf_image(insn, i));
898 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
899 /* to remove any suid privileges. */
900 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
901 /* (euid/egid have already previously been set to ruid/rgid. */
902 /* (See comment in main() for details) */
904 relinquish_special_privs_perm();
906 relinquish_all_capabilities();
909 /* Let our parent know we succeeded. */
910 pipe_write_block(2, SP_SUCCESS, NULL);
917 * capture_interface_list() is expected to do the right thing to get
918 * a list of interfaces.
920 * In most of the programs in the Wireshark suite, "the right thing"
921 * is to run dumpcap and ask it for the list, because dumpcap may
922 * be the only program in the suite with enough privileges to get
925 * In dumpcap itself, however, we obviously can't run dumpcap to
926 * ask for the list. Therefore, our capture_interface_list() should
927 * just call get_interface_list().
930 capture_interface_list(int *err, char **err_str)
932 return get_interface_list(err, err_str);
936 * Get the data-link type for a libpcap device.
937 * This works around AIX 5.x's non-standard and incompatible-with-the-
938 * rest-of-the-universe libpcap.
941 get_pcap_linktype(pcap_t *pch, const char *devname
949 const char *ifacename;
952 linktype = pcap_datalink(pch);
956 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
957 * rather than DLT_ values for link-layer types; the ifType values
958 * for LAN devices are:
965 * and the ifType value for a loopback device is 24.
967 * The AIX names for LAN devices begin with:
974 * and the AIX names for loopback devices begin with "lo".
976 * (The difference between "Ethernet" and "802.3" is presumably
977 * whether packets have an Ethernet header, with a packet type,
978 * or an 802.3 header, with a packet length, followed by an 802.2
979 * header and possibly a SNAP header.)
981 * If the device name matches "linktype" interpreted as an ifType
982 * value, rather than as a DLT_ value, we will assume this is AIX's
983 * non-standard, incompatible libpcap, rather than a standard libpcap,
984 * and will map the link-layer type to the standard DLT_ value for
985 * that link-layer type, as that's what the rest of Wireshark expects.
987 * (This means the capture files won't be readable by a tcpdump
988 * linked with AIX's non-standard libpcap, but so it goes. They
989 * *will* be readable by standard versions of tcpdump, Wireshark,
992 * XXX - if we conclude we're using AIX libpcap, should we also
993 * set a flag to cause us to assume the time stamps are in
994 * seconds-and-nanoseconds form, and to convert them to
995 * seconds-and-microseconds form before processing them and
1000 * Find the last component of the device name, which is the
1003 ifacename = strchr(devname, '/');
1004 if (ifacename == NULL)
1005 ifacename = devname;
1007 /* See if it matches any of the LAN device names. */
1008 if (strncmp(ifacename, "en", 2) == 0) {
1009 if (linktype == 6) {
1011 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
1015 } else if (strncmp(ifacename, "et", 2) == 0) {
1016 if (linktype == 7) {
1018 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
1019 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
1024 } else if (strncmp(ifacename, "tr", 2) == 0) {
1025 if (linktype == 9) {
1027 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
1028 * DLT_IEEE802, which is what's used for Token Ring.
1032 } else if (strncmp(ifacename, "fi", 2) == 0) {
1033 if (linktype == 15) {
1035 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
1039 } else if (strncmp(ifacename, "lo", 2) == 0) {
1040 if (linktype == 24) {
1042 * That's the RFC 1573 value for "software loopback" devices; map it
1043 * to DLT_NULL, which is what's used for loopback devices on BSD.
1053 static data_link_info_t *
1054 create_data_link_info(int dlt)
1056 data_link_info_t *data_link_info;
1059 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
1060 data_link_info->dlt = dlt;
1061 text = pcap_datalink_val_to_name(dlt);
1063 data_link_info->name = g_strdup(text);
1065 data_link_info->name = g_strdup_printf("DLT %d", dlt);
1066 text = pcap_datalink_val_to_description(dlt);
1068 data_link_info->description = g_strdup(text);
1070 data_link_info->description = NULL;
1071 return data_link_info;
1075 * Get the capabilities of a network device.
1077 static if_capabilities_t *
1078 get_if_capabilities(const char *devname, gboolean monitor_mode
1079 #ifndef HAVE_PCAP_CREATE
1084 if_capabilities_t *caps;
1085 char errbuf[PCAP_ERRBUF_SIZE];
1087 #ifdef HAVE_PCAP_CREATE
1091 #ifdef HAVE_PCAP_LIST_DATALINKS
1095 data_link_info_t *data_link_info;
1098 * Allocate the interface capabilities structure.
1100 caps = g_malloc(sizeof *caps);
1103 * WinPcap 4.1.2, and possibly earlier versions, have a bug
1104 * wherein, when an open with an rpcap: URL fails, the error
1105 * message for the error is not copied to errbuf and whatever
1106 * on-the-stack junk is in errbuf is treated as the error
1109 * To work around that (and any other bugs of that sort, we
1110 * initialize errbuf to an empty string. If we get an error
1111 * and the string is empty, we report it as an unknown error.
1112 * (If we *don't* get an error, and the string is *non*-empty,
1113 * that could be a warning returned, such as "can't turn
1114 * promiscuous mode on"; we currently don't do so.)
1117 #ifdef HAVE_PCAP_OPEN
1118 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1119 caps->can_set_rfmon = FALSE;
1121 if (err_str != NULL)
1122 *err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
1126 #elif defined(HAVE_PCAP_CREATE)
1127 pch = pcap_create(devname, errbuf);
1129 if (err_str != NULL)
1130 *err_str = g_strdup(errbuf);
1134 status = pcap_can_set_rfmon(pch);
1137 if (status == PCAP_ERROR)
1138 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1141 *err_str = g_strdup(pcap_statustostr(status));
1147 caps->can_set_rfmon = FALSE;
1148 else if (status == 1) {
1149 caps->can_set_rfmon = TRUE;
1151 pcap_set_rfmon(pch, 1);
1153 if (err_str != NULL) {
1154 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1162 status = pcap_activate(pch);
1164 /* Error. We ignore warnings (status > 0). */
1165 if (err_str != NULL) {
1166 if (status == PCAP_ERROR)
1167 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1170 *err_str = g_strdup(pcap_statustostr(status));
1177 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1178 caps->can_set_rfmon = FALSE;
1180 if (err_str != NULL)
1181 *err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
1186 deflt = get_pcap_linktype(pch, devname);
1187 #ifdef HAVE_PCAP_LIST_DATALINKS
1188 nlt = pcap_list_datalinks(pch, &linktypes);
1189 if (nlt == 0 || linktypes == NULL) {
1191 if (err_str != NULL)
1192 *err_str = NULL; /* an empty list doesn't mean an error */
1195 caps->data_link_types = NULL;
1196 for (i = 0; i < nlt; i++) {
1197 data_link_info = create_data_link_info(linktypes[i]);
1200 * XXX - for 802.11, make the most detailed 802.11
1201 * version the default, rather than the one the
1202 * device has as the default?
1204 if (linktypes[i] == deflt)
1205 caps->data_link_types = g_list_prepend(caps->data_link_types,
1208 caps->data_link_types = g_list_append(caps->data_link_types,
1211 #ifdef HAVE_PCAP_FREE_DATALINKS
1212 pcap_free_datalinks(linktypes);
1215 * In Windows, there's no guarantee that if you have a library
1216 * built with one version of the MSVC++ run-time library, and
1217 * it returns a pointer to allocated data, you can free that
1218 * data from a program linked with another version of the
1219 * MSVC++ run-time library.
1221 * This is not an issue on UN*X.
1223 * See the mail threads starting at
1225 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1229 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1232 #define xx_free free /* hack so checkAPIs doesn't complain */
1235 #endif /* HAVE_PCAP_FREE_DATALINKS */
1236 #else /* HAVE_PCAP_LIST_DATALINKS */
1238 data_link_info = create_data_link_info(deflt);
1239 caps->data_link_types = g_list_append(caps->data_link_types,
1241 #endif /* HAVE_PCAP_LIST_DATALINKS */
1245 if (err_str != NULL)
1250 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1252 print_machine_readable_interfaces(GList *if_list)
1259 char addr_str[ADDRSTRLEN];
1261 if (capture_child) {
1262 /* Let our parent know we succeeded. */
1263 pipe_write_block(2, SP_SUCCESS, NULL);
1266 i = 1; /* Interface id number */
1267 for (if_entry = g_list_first(if_list); if_entry != NULL;
1268 if_entry = g_list_next(if_entry)) {
1269 if_info = (if_info_t *)if_entry->data;
1270 printf("%d. %s", i++, if_info->name);
1273 * Print the contents of the if_entry struct in a parseable format.
1274 * Each if_entry element is tab-separated. Addresses are comma-
1277 /* XXX - Make sure our description doesn't contain a tab */
1278 if (if_info->description != NULL)
1279 printf("\t%s\t", if_info->description);
1283 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1284 addr = g_slist_next(addr)) {
1285 if (addr != g_slist_nth(if_info->addrs, 0))
1288 if_addr = (if_addr_t *)addr->data;
1289 switch(if_addr->ifat_type) {
1291 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1293 printf("%s", addr_str);
1295 printf("<unknown IPv4>");
1299 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1300 addr_str, ADDRSTRLEN)) {
1301 printf("%s", addr_str);
1303 printf("<unknown IPv6>");
1307 printf("<type unknown %u>", if_addr->ifat_type);
1311 if (if_info->loopback)
1312 printf("\tloopback");
1314 printf("\tnetwork");
1321 * If you change the machine-readable output format of this function,
1322 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1325 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1328 data_link_info_t *data_link_info;
1329 const gchar *desc_str;
1331 if (capture_child) {
1332 /* Let our parent know we succeeded. */
1333 pipe_write_block(2, SP_SUCCESS, NULL);
1336 if (caps->can_set_rfmon)
1340 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1341 lt_entry = g_list_next(lt_entry)) {
1342 data_link_info = (data_link_info_t *)lt_entry->data;
1343 if (data_link_info->description != NULL)
1344 desc_str = data_link_info->description;
1346 desc_str = "(not supported)";
1347 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1357 /* Print the number of packets captured for each interface until we're killed. */
1359 print_statistics_loop(gboolean machine_readable)
1361 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1367 char errbuf[PCAP_ERRBUF_SIZE];
1368 struct pcap_stat ps;
1370 if_list = get_interface_list(&err, &err_str);
1371 if (if_list == NULL) {
1373 case CANT_GET_INTERFACE_LIST:
1374 case DONT_HAVE_PCAP:
1375 cmdarg_err("%s", err_str);
1379 case NO_INTERFACES_FOUND:
1380 cmdarg_err("There are no interfaces on which a capture can be done");
1386 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1387 if_info = (if_info_t *)if_entry->data;
1388 #ifdef HAVE_PCAP_OPEN
1389 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1391 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1395 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1396 if_stat->name = g_strdup(if_info->name);
1398 stat_list = g_list_append(stat_list, if_stat);
1403 cmdarg_err("There are no interfaces on which a capture can be done");
1407 if (capture_child) {
1408 /* Let our parent know we succeeded. */
1409 pipe_write_block(2, SP_SUCCESS, NULL);
1412 if (!machine_readable) {
1413 printf("%-15s %10s %10s\n", "Interface", "Received",
1417 global_ld.go = TRUE;
1418 while (global_ld.go) {
1419 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1420 if_stat = (if_stat_t *)stat_entry->data;
1421 pcap_stats(if_stat->pch, &ps);
1423 if (!machine_readable) {
1424 printf("%-15s %10u %10u\n", if_stat->name,
1425 ps.ps_recv, ps.ps_drop);
1427 printf("%s\t%u\t%u\n", if_stat->name,
1428 ps.ps_recv, ps.ps_drop);
1439 /* XXX - Not reached. Should we look for 'q' in stdin? */
1440 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1441 if_stat = (if_stat_t *)stat_entry->data;
1442 pcap_close(if_stat->pch);
1443 g_free(if_stat->name);
1446 g_list_free(stat_list);
1447 free_interface_list(if_list);
1455 capture_cleanup_handler(DWORD dwCtrlType)
1457 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1458 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1459 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1460 like SIGTERM at least when the machine's shutting down.
1462 For now, if we're running as a command rather than a capture child,
1463 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1464 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1465 in that way on UN*X.
1467 If we're not running as a capture child, we might be running as
1468 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1469 user logs out. (XXX - can we explicitly check whether we're
1470 running as a service?) */
1472 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1473 "Console: Control signal");
1474 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1475 "Console: Control signal, CtrlType: %u", dwCtrlType);
1477 /* Keep capture running if we're a service and a user logs off */
1478 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1479 capture_loop_stop();
1487 capture_cleanup_handler(int signum _U_)
1489 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1490 SIGTERM. We assume that if the user wanted it to keep running
1491 after they logged out, they'd have nohupped it. */
1493 /* Note: don't call g_log() in the signal handler: if we happened to be in
1494 * g_log() in process context when the signal came in, g_log will detect
1495 * the "recursion" and abort.
1498 capture_loop_stop();
1504 report_capture_count(gboolean reportit)
1506 /* Don't print this if we're a capture child. */
1507 if (!capture_child && reportit) {
1508 fprintf(stderr, "\rPackets captured: %u\n", global_ld.packet_count);
1509 /* stderr could be line buffered */
1517 report_counts_for_siginfo(void)
1519 report_capture_count(quiet);
1520 infoprint = FALSE; /* we just reported it */
1524 report_counts_siginfo(int signum _U_)
1526 int sav_errno = errno;
1528 /* If we've been told to delay printing, just set a flag asking
1529 that we print counts (if we're supposed to), otherwise print
1530 the count of packets captured (if we're supposed to). */
1534 report_counts_for_siginfo();
1537 #endif /* SIGINFO */
1540 exit_main(int status)
1543 /* Shutdown windows sockets */
1546 /* can be helpful for debugging */
1547 #ifdef DEBUG_DUMPCAP
1548 printf("Press any key\n");
1559 * If we were linked with libcap (not libpcap), make sure we have
1560 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1561 * (See comment in main() for details)
1564 relinquish_privs_except_capture(void)
1566 /* If 'started_with_special_privs' (ie: suid) then enable for
1567 * ourself the NET_ADMIN and NET_RAW capabilities and then
1568 * drop our suid privileges.
1570 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1571 * stuff we don't need (and shouldn't have).
1572 * CAP_NET_RAW: Packet capture (raw sockets).
1575 if (started_with_special_privs()) {
1576 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1577 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1579 cap_t caps = cap_init(); /* all capabilities initialized to off */
1581 print_caps("Pre drop, pre set");
1583 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1584 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1587 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1588 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1590 if (cap_set_proc(caps)) {
1591 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1593 print_caps("Pre drop, post set");
1595 relinquish_special_privs_perm();
1597 print_caps("Post drop, pre set");
1598 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1599 if (cap_set_proc(caps)) {
1600 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1602 print_caps("Post drop, post set");
1608 #endif /* HAVE_LIBCAP */
1610 /* Take care of byte order in the libpcap headers read from pipes.
1611 * (function taken from wiretap/libpcap.c) */
1613 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1616 /* Byte-swap the record header fields. */
1617 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1618 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1619 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1620 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1623 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1624 swapped, in order to match the BPF header layout.
1626 Unfortunately, some files were, according to a comment in the "libpcap"
1627 source, written with version 2.3 in their headers but without the
1628 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1629 would make no sense - we assume that we need to swap them. */
1630 if (hdr->version_major == 2 &&
1631 (hdr->version_minor < 3 ||
1632 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1635 temp = rechdr->orig_len;
1636 rechdr->orig_len = rechdr->incl_len;
1637 rechdr->incl_len = temp;
1643 * Thread function that reads from a pipe and pushes the data
1644 * to the main application thread.
1647 * XXX Right now we use async queues for basic signaling. The main thread
1648 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1649 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1650 * Iff the read is successful cap_pipe_read pushes an item onto
1651 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1652 * the queues themselves (yet).
1654 * We might want to move some of the cap_pipe_dispatch logic here so that
1655 * we can let cap_pipe_read run independently, queuing up multiple reads
1656 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1658 static void *cap_pipe_read(void *arg)
1660 pcap_options *pcap_opts;
1669 pcap_opts = (pcap_options *)arg;
1670 while (pcap_opts->cap_pipe_err == PIPOK) {
1671 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1672 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1674 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1676 /* If we try to use read() on a named pipe on Windows with partial
1677 * data it appears to return EOF.
1679 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1680 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1685 last_err = GetLastError();
1686 if (last_err == ERROR_MORE_DATA) {
1688 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1689 pcap_opts->cap_pipe_err = PIPEOF;
1693 pcap_opts->cap_pipe_err = PIPERR;
1696 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1697 pcap_opts->cap_pipe_err = PIPEOF;
1702 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1703 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1706 pcap_opts->cap_pipe_err = PIPEOF;
1710 pcap_opts->cap_pipe_err = PIPERR;
1719 pcap_opts->cap_pipe_bytes_read = bytes_read;
1720 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1721 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1723 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1729 #if !defined(_WIN32) || defined(MUST_DO_SELECT)
1730 /* Provide select() functionality for a single file descriptor
1731 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1733 * Returns the same values as select.
1736 cap_pipe_select(int pipe_fd)
1739 struct timeval timeout;
1742 FD_SET(pipe_fd, &rfds);
1744 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1745 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1747 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1752 /* Mimic pcap_open_live() for pipe captures
1754 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1755 * open it, and read the header.
1757 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1758 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1760 cap_pipe_open_live(char *pipename,
1761 pcap_options *pcap_opts,
1762 struct pcap_hdr *hdr,
1763 char *errmsg, int errmsgl)
1766 ws_statb64 pipe_stat;
1767 struct sockaddr_un sa;
1778 unsigned int bytes_read;
1783 pcap_opts->cap_pipe_fd = -1;
1785 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1787 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1790 * XXX - this blocks until a pcap per-file header has been written to
1791 * the pipe, so it could block indefinitely.
1793 if (strcmp(pipename, "-") == 0) {
1795 fd = 0; /* read from stdin */
1797 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1801 if (ws_stat64(pipename, &pipe_stat) < 0) {
1802 if (errno == ENOENT || errno == ENOTDIR)
1803 pcap_opts->cap_pipe_err = PIPNEXIST;
1805 g_snprintf(errmsg, errmsgl,
1806 "The capture session could not be initiated "
1807 "due to error getting information on pipe/socket: %s", g_strerror(errno));
1808 pcap_opts->cap_pipe_err = PIPERR;
1812 if (S_ISFIFO(pipe_stat.st_mode)) {
1813 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1815 g_snprintf(errmsg, errmsgl,
1816 "The capture session could not be initiated "
1817 "due to error on pipe open: %s", g_strerror(errno));
1818 pcap_opts->cap_pipe_err = PIPERR;
1821 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1822 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1824 g_snprintf(errmsg, errmsgl,
1825 "The capture session could not be initiated "
1826 "due to error on socket create: %s", g_strerror(errno));
1827 pcap_opts->cap_pipe_err = PIPERR;
1830 sa.sun_family = AF_UNIX;
1832 * The Single UNIX Specification says:
1834 * The size of sun_path has intentionally been left undefined.
1835 * This is because different implementations use different sizes.
1836 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1837 * of 104. Since most implementations originate from BSD versions,
1838 * the size is typically in the range 92 to 108.
1840 * Applications should not assume a particular length for sun_path
1841 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1845 * The <sys/un.h> header shall define the sockaddr_un structure,
1846 * which shall include at least the following members:
1848 * sa_family_t sun_family Address family.
1849 * char sun_path[] Socket pathname.
1851 * so we assume that it's an array, with a specified size,
1852 * and that the size reflects the maximum path length.
1854 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1855 /* Path name too long */
1856 g_snprintf(errmsg, errmsgl,
1857 "The capture session coud not be initiated "
1858 "due to error on socket connect: Path name too long");
1859 pcap_opts->cap_pipe_err = PIPERR;
1862 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1864 g_snprintf(errmsg, errmsgl,
1865 "The capture session coud not be initiated "
1866 "due to error on socket connect: %s", g_strerror(errno));
1867 pcap_opts->cap_pipe_err = PIPERR;
1871 if (S_ISCHR(pipe_stat.st_mode)) {
1873 * Assume the user specified an interface on a system where
1874 * interfaces are in /dev. Pretend we haven't seen it.
1876 pcap_opts->cap_pipe_err = PIPNEXIST;
1879 g_snprintf(errmsg, errmsgl,
1880 "The capture session could not be initiated because\n"
1881 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1882 pcap_opts->cap_pipe_err = PIPERR;
1887 #define PIPE_STR "\\pipe\\"
1888 /* Under Windows, named pipes _must_ have the form
1889 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1891 pncopy = g_strdup(pipename);
1892 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1893 pos = strchr(pncopy + 3, '\\');
1894 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1901 g_snprintf(errmsg, errmsgl,
1902 "The capture session could not be initiated because\n"
1903 "\"%s\" is neither an interface nor a pipe", pipename);
1904 pcap_opts->cap_pipe_err = PIPNEXIST;
1908 /* Wait for the pipe to appear */
1910 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1911 OPEN_EXISTING, 0, NULL);
1913 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1916 if (GetLastError() != ERROR_PIPE_BUSY) {
1917 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1918 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1919 g_snprintf(errmsg, errmsgl,
1920 "The capture session on \"%s\" could not be started "
1921 "due to error on pipe open: %s (error %d)",
1922 pipename, utf_16to8(err_str), GetLastError());
1924 pcap_opts->cap_pipe_err = PIPERR;
1928 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1929 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1930 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1931 g_snprintf(errmsg, errmsgl,
1932 "The capture session on \"%s\" timed out during "
1933 "pipe open: %s (error %d)",
1934 pipename, utf_16to8(err_str), GetLastError());
1936 pcap_opts->cap_pipe_err = PIPERR;
1943 pcap_opts->from_cap_pipe = TRUE;
1946 /* read the pcap header */
1948 while (bytes_read < sizeof magic) {
1949 sel_ret = cap_pipe_select(fd);
1951 g_snprintf(errmsg, errmsgl,
1952 "Unexpected error from select: %s", g_strerror(errno));
1954 } else if (sel_ret > 0) {
1955 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1958 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1960 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1968 g_thread_create(&cap_pipe_read, pcap_opts, FALSE, NULL);
1970 pcap_opts->cap_pipe_buf = (char *) &magic;
1971 pcap_opts->cap_pipe_bytes_read = 0;
1972 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1973 /* We don't have to worry about cap_pipe_read_mtx here */
1974 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1975 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1976 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1977 if (pcap_opts->cap_pipe_bytes_read == 0)
1978 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1980 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1989 case PCAP_NSEC_MAGIC:
1990 /* Host that wrote it has our byte order, and was running
1991 a program using either standard or ss990417 libpcap. */
1992 pcap_opts->cap_pipe_byte_swapped = FALSE;
1993 pcap_opts->cap_pipe_modified = FALSE;
1994 pcap_opts->ts_nsec = magic == PCAP_NSEC_MAGIC;
1996 case PCAP_MODIFIED_MAGIC:
1997 /* Host that wrote it has our byte order, but was running
1998 a program using either ss990915 or ss991029 libpcap. */
1999 pcap_opts->cap_pipe_byte_swapped = FALSE;
2000 pcap_opts->cap_pipe_modified = TRUE;
2002 case PCAP_SWAPPED_MAGIC:
2003 case PCAP_SWAPPED_NSEC_MAGIC:
2004 /* Host that wrote it has a byte order opposite to ours,
2005 and was running a program using either standard or
2006 ss990417 libpcap. */
2007 pcap_opts->cap_pipe_byte_swapped = TRUE;
2008 pcap_opts->cap_pipe_modified = FALSE;
2009 pcap_opts->ts_nsec = magic == PCAP_SWAPPED_NSEC_MAGIC;
2011 case PCAP_SWAPPED_MODIFIED_MAGIC:
2012 /* Host that wrote it out has a byte order opposite to
2013 ours, and was running a program using either ss990915
2014 or ss991029 libpcap. */
2015 pcap_opts->cap_pipe_byte_swapped = TRUE;
2016 pcap_opts->cap_pipe_modified = TRUE;
2019 /* Not a "libpcap" type we know about. */
2020 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
2025 /* Read the rest of the header */
2027 while (bytes_read < sizeof(struct pcap_hdr)) {
2028 sel_ret = cap_pipe_select(fd);
2030 g_snprintf(errmsg, errmsgl,
2031 "Unexpected error from select: %s", g_strerror(errno));
2033 } else if (sel_ret > 0) {
2034 b = read(fd, ((char *)hdr)+bytes_read,
2035 sizeof(struct pcap_hdr) - bytes_read);
2038 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
2040 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
2048 pcap_opts->cap_pipe_buf = (char *) hdr;
2049 pcap_opts->cap_pipe_bytes_read = 0;
2050 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
2051 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2052 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
2053 if (pcap_opts->cap_pipe_bytes_read <= 0) {
2054 if (pcap_opts->cap_pipe_bytes_read == 0)
2055 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
2057 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
2063 if (pcap_opts->cap_pipe_byte_swapped) {
2064 /* Byte-swap the header fields about which we care. */
2065 hdr->version_major = BSWAP16(hdr->version_major);
2066 hdr->version_minor = BSWAP16(hdr->version_minor);
2067 hdr->snaplen = BSWAP32(hdr->snaplen);
2068 hdr->network = BSWAP32(hdr->network);
2070 pcap_opts->linktype = hdr->network;
2072 if (hdr->version_major < 2) {
2073 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
2077 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2078 pcap_opts->cap_pipe_err = PIPOK;
2080 pcap_opts->cap_pipe_fd = fd;
2085 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
2086 pcap_opts->cap_pipe_err = PIPERR;
2089 pcap_opts->cap_pipe_fd = -1;
2096 /* We read one record from the pipe, take care of byte order in the record
2097 * header, write the record to the capture file, and update capture statistics. */
2099 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
2101 struct pcap_pkthdr phdr;
2102 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2105 #if !GLIB_CHECK_VERSION(2,31,18)
2116 #ifdef LOG_CAPTURE_VERBOSE
2117 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2120 switch (pcap_opts->cap_pipe_state) {
2122 case STATE_EXPECT_REC_HDR:
2124 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2127 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2128 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2129 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2130 pcap_opts->cap_pipe_bytes_read = 0;
2133 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2134 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2135 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2140 case STATE_READ_REC_HDR:
2142 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2143 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2146 result = PD_PIPE_EOF;
2148 result = PD_PIPE_ERR;
2151 pcap_opts->cap_pipe_bytes_read += b;
2153 #if GLIB_CHECK_VERSION(2,31,18)
2154 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
2156 g_get_current_time(&wait_time);
2157 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2158 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2160 if (pcap_opts->cap_pipe_err == PIPEOF) {
2161 result = PD_PIPE_EOF;
2163 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2164 result = PD_PIPE_ERR;
2171 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2173 result = PD_REC_HDR_READ;
2176 case STATE_EXPECT_DATA:
2178 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2181 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2182 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2183 pcap_opts->cap_pipe_bytes_read = 0;
2186 pcap_opts->cap_pipe_buf = (char *) data;
2187 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2188 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2193 case STATE_READ_DATA:
2195 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2196 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2199 result = PD_PIPE_EOF;
2201 result = PD_PIPE_ERR;
2204 pcap_opts->cap_pipe_bytes_read += b;
2206 #if GLIB_CHECK_VERSION(2,31,18)
2207 q_status = g_async_queue_timeout_pop(pcap_opts->cap_pipe_done_q, PIPE_READ_TIMEOUT);
2209 g_get_current_time(&wait_time);
2210 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2211 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2213 if (pcap_opts->cap_pipe_err == PIPEOF) {
2214 result = PD_PIPE_EOF;
2216 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2217 result = PD_PIPE_ERR;
2224 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2226 result = PD_DATA_READ;
2230 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2233 } /* switch (pcap_opts->cap_pipe_state) */
2236 * We've now read as much data as we were expecting, so process it.
2240 case PD_REC_HDR_READ:
2241 /* We've read the header. Take care of byte order. */
2242 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2243 &pcap_opts->cap_pipe_rechdr.hdr);
2244 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2245 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2246 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2250 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2251 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2254 /* no data to read? fall through */
2257 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2258 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2259 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2260 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2261 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2264 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2266 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2268 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2272 pcap_opts->cap_pipe_err = PIPEOF;
2277 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2278 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2279 g_snprintf(errmsg, errmsgl,
2280 "Error reading from pipe: %s (error %d)",
2281 utf_16to8(err_str), GetLastError());
2284 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2292 pcap_opts->cap_pipe_err = PIPERR;
2293 /* Return here rather than inside the switch to prevent GCC warning */
2298 /** Open the capture input file (pcap or capture pipe).
2299 * Returns TRUE if it succeeds, FALSE otherwise. */
2301 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2302 char *errmsg, size_t errmsg_len,
2303 char *secondary_errmsg, size_t secondary_errmsg_len)
2305 gchar open_err_str[PCAP_ERRBUF_SIZE];
2306 gchar *sync_msg_str;
2307 interface_options interface_opts;
2308 pcap_options *pcap_opts;
2312 gchar *sync_secondary_msg_str;
2313 WORD wVersionRequested;
2317 /* XXX - opening Winsock on tshark? */
2319 /* Initialize Windows Socket if we are in a WIN32 OS
2320 This needs to be done before querying the interface for network/netmask */
2322 /* XXX - do we really require 1.1 or earlier?
2323 Are there any versions that support only 2.0 or higher? */
2324 wVersionRequested = MAKEWORD(1, 1);
2325 err = WSAStartup(wVersionRequested, &wsaData);
2329 case WSASYSNOTREADY:
2330 g_snprintf(errmsg, (gulong) errmsg_len,
2331 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2334 case WSAVERNOTSUPPORTED:
2335 g_snprintf(errmsg, (gulong) errmsg_len,
2336 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2337 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2340 case WSAEINPROGRESS:
2341 g_snprintf(errmsg, (gulong) errmsg_len,
2342 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2346 g_snprintf(errmsg, (gulong) errmsg_len,
2347 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2351 g_snprintf(errmsg, (gulong) errmsg_len,
2352 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2356 g_snprintf(errmsg, (gulong) errmsg_len,
2357 "Couldn't initialize Windows Sockets: error %d", err);
2360 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2364 if ((use_threads == FALSE) &&
2365 (capture_opts->ifaces->len > 1)) {
2366 g_snprintf(errmsg, (gulong) errmsg_len,
2367 "Using threads is required for capturing on multiple interfaces!");
2371 for (i = 0; i < capture_opts->ifaces->len; i++) {
2372 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2373 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2374 if (pcap_opts == NULL) {
2375 g_snprintf(errmsg, (gulong) errmsg_len,
2376 "Could not allocate memory.");
2379 pcap_opts->received = 0;
2380 pcap_opts->dropped = 0;
2381 pcap_opts->pcap_h = NULL;
2382 #ifdef MUST_DO_SELECT
2383 pcap_opts->pcap_fd = -1;
2385 pcap_opts->pcap_err = FALSE;
2386 pcap_opts->interface_id = i;
2387 pcap_opts->tid = NULL;
2388 pcap_opts->snaplen = 0;
2389 pcap_opts->linktype = -1;
2390 pcap_opts->ts_nsec = FALSE;
2391 pcap_opts->from_cap_pipe = FALSE;
2392 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2393 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2395 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2397 pcap_opts->cap_pipe_fd = -1;
2399 pcap_opts->cap_pipe_modified = FALSE;
2400 pcap_opts->cap_pipe_byte_swapped = FALSE;
2402 pcap_opts->cap_pipe_buf = NULL;
2404 pcap_opts->cap_pipe_bytes_to_read = 0;
2405 pcap_opts->cap_pipe_bytes_read = 0;
2406 pcap_opts->cap_pipe_state = 0;
2407 pcap_opts->cap_pipe_err = PIPOK;
2409 #if GLIB_CHECK_VERSION(2,31,0)
2410 pcap_opts->cap_pipe_read_mtx = g_malloc(sizeof(GMutex));
2411 g_mutex_init(pcap_opts->cap_pipe_read_mtx);
2413 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2415 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2416 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2418 g_array_append_val(ld->pcaps, pcap_opts);
2420 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2421 pcap_opts->pcap_h = open_capture_device(&interface_opts, &open_err_str);
2423 if (pcap_opts->pcap_h != NULL) {
2424 /* we've opened "iface" as a network device */
2426 /* try to set the capture buffer size */
2427 if (interface_opts.buffer_size > 1 &&
2428 pcap_setbuff(pcap_opts->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2429 sync_secondary_msg_str = g_strdup_printf(
2430 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2431 "the default of 1MB will be used.\n"
2433 "Nonetheless, the capture is started.\n",
2434 interface_opts.buffer_size);
2435 report_capture_error("Couldn't set the capture buffer size!",
2436 sync_secondary_msg_str);
2437 g_free(sync_secondary_msg_str);
2441 #if defined(HAVE_PCAP_SETSAMPLING)
2442 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2443 struct pcap_samp *samp;
2445 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2446 switch (interface_opts.sampling_method) {
2447 case CAPTURE_SAMP_BY_COUNT:
2448 samp->method = PCAP_SAMP_1_EVERY_N;
2451 case CAPTURE_SAMP_BY_TIMER:
2452 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2456 sync_msg_str = g_strdup_printf(
2457 "Unknown sampling method %d specified,\n"
2458 "continue without packet sampling",
2459 interface_opts.sampling_method);
2460 report_capture_error("Couldn't set the capture "
2461 "sampling", sync_msg_str);
2462 g_free(sync_msg_str);
2464 samp->value = interface_opts.sampling_param;
2466 report_capture_error("Couldn't set the capture sampling",
2467 "Cannot get packet sampling data structure");
2472 /* setting the data link type only works on real interfaces */
2473 if (!set_pcap_linktype(pcap_opts->pcap_h, interface_opts.linktype, interface_opts.name,
2475 secondary_errmsg, secondary_errmsg_len)) {
2478 pcap_opts->linktype = get_pcap_linktype(pcap_opts->pcap_h, interface_opts.name);
2480 /* We couldn't open "iface" as a network device. */
2481 /* Try to open it as a pipe */
2482 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2485 if (pcap_opts->cap_pipe_fd == -1) {
2487 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2489 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2490 /* Pipe doesn't exist, so output message for interface */
2491 get_capture_device_open_failure_messages(open_err_str,
2492 interface_opts.name,
2496 secondary_errmsg_len);
2499 * Else pipe (or file) does exist and cap_pipe_open_live() has
2504 /* cap_pipe_open_live() succeeded; don't want
2505 error message from pcap_open_live() */
2506 open_err_str[0] = '\0';
2510 /* XXX - will this work for tshark? */
2511 #ifdef MUST_DO_SELECT
2512 if (!pcap_opts->from_cap_pipe) {
2513 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2514 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2516 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2521 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2522 returned a warning; print it, but keep capturing. */
2523 if (open_err_str[0] != '\0') {
2524 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2525 report_capture_error(sync_msg_str, "");
2526 g_free(sync_msg_str);
2528 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2529 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2532 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2533 /* to remove any suid privileges. */
2534 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2535 /* (euid/egid have already previously been set to ruid/rgid. */
2536 /* (See comment in main() for details) */
2538 relinquish_special_privs_perm();
2540 relinquish_all_capabilities();
2545 /* close the capture input file (pcap or capture pipe) */
2546 static void capture_loop_close_input(loop_data *ld)
2549 pcap_options *pcap_opts;
2551 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2553 for (i = 0; i < ld->pcaps->len; i++) {
2554 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2555 /* if open, close the capture pipe "input file" */
2557 if (pcap_opts->cap_pipe_fd >= 0) {
2558 g_assert(pcap_opts->from_cap_pipe);
2559 ws_close(pcap_opts->cap_pipe_fd);
2560 pcap_opts->cap_pipe_fd = -1;
2563 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2564 CloseHandle(pcap_opts->cap_pipe_h);
2565 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2568 /* if open, close the pcap "input file" */
2569 if (pcap_opts->pcap_h != NULL) {
2570 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2571 pcap_close(pcap_opts->pcap_h);
2572 pcap_opts->pcap_h = NULL;
2579 /* Shut down windows sockets */
2585 /* init the capture filter */
2586 static initfilter_status_t
2587 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2588 const gchar * name, const gchar * cfilter)
2590 struct bpf_program fcode;
2592 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2594 /* capture filters only work on real interfaces */
2595 if (cfilter && !from_cap_pipe) {
2596 /* A capture filter was specified; set it up. */
2597 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2598 /* Treat this specially - our caller might try to compile this
2599 as a display filter and, if that succeeds, warn the user that
2600 the display and capture filter syntaxes are different. */
2601 return INITFILTER_BAD_FILTER;
2603 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2604 #ifdef HAVE_PCAP_FREECODE
2605 pcap_freecode(&fcode);
2607 return INITFILTER_OTHER_ERROR;
2609 #ifdef HAVE_PCAP_FREECODE
2610 pcap_freecode(&fcode);
2614 return INITFILTER_NO_ERROR;
2618 /* set up to write to the already-opened capture output file/files */
2620 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2624 pcap_options *pcap_opts;
2625 interface_options interface_opts;
2626 gboolean successful;
2628 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2630 if ((capture_opts->use_pcapng == FALSE) &&
2631 (capture_opts->ifaces->len > 1)) {
2632 g_snprintf(errmsg, errmsg_len,
2633 "Using PCAPNG is required for capturing on multiple interfaces! Use the -n option.");
2637 /* Set up to write to the capture file. */
2638 if (capture_opts->multi_files_on) {
2639 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2641 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2644 if (capture_opts->use_pcapng) {
2646 GString *os_info_str;
2648 os_info_str = g_string_new("");
2649 get_os_version_info(os_info_str);
2651 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2652 successful = libpcap_write_session_header_block(ld->pdh,
2655 os_info_str->str, /* OS*/
2657 -1, /* section_length */
2661 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2662 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2663 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2664 if (pcap_opts->from_cap_pipe) {
2665 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2667 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2669 successful = libpcap_write_interface_description_block(global_ld.pdh,
2670 NULL, /* OPT_COMMENT 1 */
2671 interface_opts.name, /* IDB_NAME 2 */
2672 interface_opts.descr, /* IDB_DESCRIPTION 3 */
2673 interface_opts.cfilter, /* IDB_FILTER 11 */
2674 os_info_str->str, /* IDB_OS 12 */
2675 pcap_opts->linktype,
2677 &(global_ld.bytes_written),
2678 0, /* IDB_IF_SPEED 8 */
2679 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
2683 g_string_free(os_info_str, TRUE);
2686 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2687 if (pcap_opts->from_cap_pipe) {
2688 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2690 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2692 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2693 pcap_opts->ts_nsec, &ld->bytes_written, &err);
2701 if (ld->pdh == NULL) {
2702 /* We couldn't set up to write to the capture file. */
2703 /* XXX - use cf_open_error_message from tshark instead? */
2708 g_snprintf(errmsg, errmsg_len,
2709 "The file to which the capture would be"
2710 " saved (\"%s\") could not be opened: Error %d.",
2711 capture_opts->save_file, err);
2713 g_snprintf(errmsg, errmsg_len,
2714 "The file to which the capture would be"
2715 " saved (\"%s\") could not be opened: %s.",
2716 capture_opts->save_file, g_strerror(err));
2728 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2732 pcap_options *pcap_opts;
2733 guint64 end_time = create_timestamp();
2735 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2737 if (capture_opts->multi_files_on) {
2738 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2740 if (capture_opts->use_pcapng) {
2741 for (i = 0; i < global_ld.pcaps->len; i++) {
2742 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2743 if (!pcap_opts->from_cap_pipe) {
2744 libpcap_write_interface_statistics_block(ld->pdh,
2748 "Counters provided by libpcap",
2755 return libpcap_dump_close(ld->pdh, err_close);
2759 /* dispatch incoming packets (pcap or capture pipe)
2761 * Waits for incoming packets to be available, and calls pcap_dispatch()
2762 * to cause them to be processed.
2764 * Returns the number of packets which were processed.
2766 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2767 * packet-batching behaviour does not cause packets to get held back
2771 capture_loop_dispatch(loop_data *ld,
2772 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2775 gint packet_count_before;
2776 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2781 packet_count_before = ld->packet_count;
2782 if (pcap_opts->from_cap_pipe) {
2783 /* dispatch from capture pipe */
2784 #ifdef LOG_CAPTURE_VERBOSE
2785 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2788 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2790 if (sel_ret < 0 && errno != EINTR) {
2791 g_snprintf(errmsg, errmsg_len,
2792 "Unexpected error from select: %s", g_strerror(errno));
2793 report_capture_error(errmsg, please_report);
2798 * "select()" says we can read from the pipe without blocking
2801 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2811 /* dispatch from pcap */
2812 #ifdef MUST_DO_SELECT
2814 * If we have "pcap_get_selectable_fd()", we use it to get the
2815 * descriptor on which to select; if that's -1, it means there
2816 * is no descriptor on which you can do a "select()" (perhaps
2817 * because you're capturing on a special device, and that device's
2818 * driver unfortunately doesn't support "select()", in which case
2819 * we don't do the select - which means it might not be possible
2820 * to stop a capture until a packet arrives. If that's unacceptable,
2821 * plead with whoever supplies the software for that device to add
2822 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2823 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2824 * later, so it can use pcap_breakloop().
2826 #ifdef LOG_CAPTURE_VERBOSE
2827 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2829 if (pcap_opts->pcap_fd != -1) {
2830 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2833 * "select()" says we can read from it without blocking; go for
2836 * We don't have pcap_breakloop(), so we only process one packet
2837 * per pcap_dispatch() call, to allow a signal to stop the
2838 * processing immediately, rather than processing all packets
2839 * in a batch before quitting.
2842 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2844 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2848 /* Error, rather than pcap_breakloop(). */
2849 pcap_opts->pcap_err = TRUE;
2851 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2854 if (sel_ret < 0 && errno != EINTR) {
2855 g_snprintf(errmsg, errmsg_len,
2856 "Unexpected error from select: %s", g_strerror(errno));
2857 report_capture_error(errmsg, please_report);
2863 #endif /* MUST_DO_SELECT */
2865 /* dispatch from pcap without select */
2867 #ifdef LOG_CAPTURE_VERBOSE
2868 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2872 * On Windows, we don't support asynchronously telling a process to
2873 * stop capturing; instead, we check for an indication on a pipe
2874 * after processing packets. We therefore process only one packet
2875 * at a time, so that we can check the pipe after every packet.
2878 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2880 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2884 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2886 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2891 /* Error, rather than pcap_breakloop(). */
2892 pcap_opts->pcap_err = TRUE;
2894 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2896 #else /* pcap_next_ex */
2897 #ifdef LOG_CAPTURE_VERBOSE
2898 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2900 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2903 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2904 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2905 * This should be fixed in the WinPcap 4.0 alpha release.
2907 * For reference, an example remote interface:
2908 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2911 /* emulate dispatch from pcap */
2914 struct pcap_pkthdr *pkt_header;
2919 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2921 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2923 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2928 pcap_opts->pcap_err = TRUE;
2932 #endif /* pcap_next_ex */
2936 #ifdef LOG_CAPTURE_VERBOSE
2937 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2940 return ld->packet_count - packet_count_before;
2944 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2945 * want to grab only the characters between the '{' and '}' delimiters.
2947 * Returns a GString that must be freed with g_string_free(). */
2949 isolate_uuid(const char *iface)
2954 ptr = strchr(iface, '{');
2956 return g_string_new(iface);
2957 gstr = g_string_new(ptr + 1);
2959 ptr = strchr(gstr->str, '}');
2963 gstr = g_string_truncate(gstr, ptr - gstr->str);
2968 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2969 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2971 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2972 char *errmsg, int errmsg_len)
2975 gchar *capfile_name;
2977 gboolean is_tempfile;
2979 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2980 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2982 if (capture_opts->save_file != NULL) {
2983 /* We return to the caller while the capture is in progress.
2984 * Therefore we need to take a copy of save_file in
2985 * case the caller destroys it after we return.
2987 capfile_name = g_strdup(capture_opts->save_file);
2989 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2990 if (capture_opts->multi_files_on) {
2991 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2992 g_snprintf(errmsg, errmsg_len,
2993 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2994 g_free(capfile_name);
2997 if (strcmp(capfile_name, "-") == 0) {
2998 /* write to stdout */
3001 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
3002 _setmode(1, O_BINARY);
3005 } /* if (...output_to_pipe ... */
3008 if (capture_opts->multi_files_on) {
3009 /* ringbuffer is enabled */
3010 *save_file_fd = ringbuf_init(capfile_name,
3011 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
3012 capture_opts->group_read_access);
3014 /* we need the ringbuf name */
3015 if(*save_file_fd != -1) {
3016 g_free(capfile_name);
3017 capfile_name = g_strdup(ringbuf_current_filename());
3020 /* Try to open/create the specified file for use as a capture buffer. */
3021 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
3022 (capture_opts->group_read_access) ? 0640 : 0600);
3025 is_tempfile = FALSE;
3027 /* Choose a random name for the temporary capture buffer */
3028 if (global_capture_opts.ifaces->len > 1) {
3029 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
3034 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
3035 basename = g_path_get_basename(iface->str);
3036 g_string_free(iface, TRUE);
3038 basename = g_path_get_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
3040 prefix = g_strconcat("wireshark_", basename, NULL);
3043 *save_file_fd = create_tempfile(&tmpname, prefix);
3045 capfile_name = g_strdup(tmpname);
3049 /* did we fail to open the output file? */
3050 if (*save_file_fd == -1) {
3052 g_snprintf(errmsg, errmsg_len,
3053 "The temporary file to which the capture would be saved (\"%s\") "
3054 "could not be opened: %s.", capfile_name, g_strerror(errno));
3056 if (capture_opts->multi_files_on) {
3057 ringbuf_error_cleanup();
3060 g_snprintf(errmsg, errmsg_len,
3061 "The file to which the capture would be saved (\"%s\") "
3062 "could not be opened: %s.", capfile_name,
3065 g_free(capfile_name);
3069 if(capture_opts->save_file != NULL) {
3070 g_free(capture_opts->save_file);
3072 capture_opts->save_file = capfile_name;
3073 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
3074 "g_free(capfile_name)". */
3080 /* Do the work of handling either the file size or file duration capture
3081 conditions being reached, and switching files or stopping. */
3083 do_file_switch_or_stop(capture_options *capture_opts,
3084 condition *cnd_autostop_files,
3085 condition *cnd_autostop_size,
3086 condition *cnd_file_duration)
3089 pcap_options *pcap_opts;
3090 interface_options interface_opts;
3091 gboolean successful;
3093 if (capture_opts->multi_files_on) {
3094 if (cnd_autostop_files != NULL &&
3095 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
3096 /* no files left: stop here */
3097 global_ld.go = FALSE;
3101 /* Switch to the next ringbuffer file */
3102 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
3103 &global_ld.save_file_fd, &global_ld.err)) {
3105 /* File switch succeeded: reset the conditions */
3106 global_ld.bytes_written = 0;
3107 if (capture_opts->use_pcapng) {
3109 GString *os_info_str;
3111 os_info_str = g_string_new("");
3112 get_os_version_info(os_info_str);
3114 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
3115 successful = libpcap_write_session_header_block(global_ld.pdh,
3118 os_info_str->str, /* OS */
3120 -1, /* section_length */
3121 &(global_ld.bytes_written),
3124 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
3125 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3126 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3127 successful = libpcap_write_interface_description_block(global_ld.pdh,
3128 NULL, /* OPT_COMMENT 1 */
3129 interface_opts.name, /* IDB_NAME 2 */
3130 interface_opts.descr, /* IDB_DESCRIPTION 3 */
3131 interface_opts.cfilter, /* IDB_FILTER 11 */
3132 os_info_str->str, /* IDB_OS 12 */
3133 pcap_opts->linktype,
3135 &(global_ld.bytes_written),
3136 0, /* IDB_IF_SPEED 8 */
3137 pcap_opts->ts_nsec ? 9 : 6, /* IDB_TSRESOL 9 */
3141 g_string_free(os_info_str, TRUE);
3144 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3145 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
3146 pcap_opts->ts_nsec, &global_ld.bytes_written, &global_ld.err);
3149 fclose(global_ld.pdh);
3150 global_ld.pdh = NULL;
3151 global_ld.go = FALSE;
3154 if (cnd_autostop_size)
3155 cnd_reset(cnd_autostop_size);
3156 if (cnd_file_duration)
3157 cnd_reset(cnd_file_duration);
3158 libpcap_dump_flush(global_ld.pdh, NULL);
3160 report_packet_count(global_ld.inpkts_to_sync_pipe);
3161 global_ld.inpkts_to_sync_pipe = 0;
3162 report_new_capture_file(capture_opts->save_file);
3164 /* File switch failed: stop here */
3165 global_ld.go = FALSE;
3169 /* single file, stop now */
3170 global_ld.go = FALSE;
3177 pcap_read_handler(void* arg)
3179 pcap_options *pcap_opts;
3180 char errmsg[MSG_MAX_LENGTH+1];
3182 pcap_opts = (pcap_options *)arg;
3184 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
3185 pcap_opts->interface_id);
3187 while (global_ld.go) {
3188 /* dispatch incoming packets */
3189 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
3191 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
3192 pcap_opts->interface_id);
3193 g_thread_exit(NULL);
3197 /* Do the low-level work of a capture.
3198 Returns TRUE if it succeeds, FALSE otherwise. */
3200 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3203 DWORD upd_time, cur_time; /* GetTickCount() returns a "DWORD" (which is 'unsigned long') */
3205 struct timeval upd_time, cur_time;
3209 condition *cnd_file_duration = NULL;
3210 condition *cnd_autostop_files = NULL;
3211 condition *cnd_autostop_size = NULL;
3212 condition *cnd_autostop_duration = NULL;
3215 gboolean cfilter_error = FALSE;
3216 char errmsg[MSG_MAX_LENGTH+1];
3217 char secondary_errmsg[MSG_MAX_LENGTH+1];
3218 pcap_options *pcap_opts;
3219 interface_options interface_opts;
3220 guint i, error_index = 0;
3223 *secondary_errmsg = '\0';
3225 /* init the loop data */
3226 global_ld.go = TRUE;
3227 global_ld.packet_count = 0;
3229 global_ld.report_packet_count = FALSE;
3231 if (capture_opts->has_autostop_packets)
3232 global_ld.packet_max = capture_opts->autostop_packets;
3234 global_ld.packet_max = 0; /* no limit */
3235 global_ld.inpkts_to_sync_pipe = 0;
3236 global_ld.err = 0; /* no error seen yet */
3237 global_ld.pdh = NULL;
3238 global_ld.autostop_files = 0;
3239 global_ld.save_file_fd = -1;
3241 /* We haven't yet gotten the capture statistics. */
3242 *stats_known = FALSE;
3244 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3245 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3247 /* open the "input file" from network interface or capture pipe */
3248 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3249 secondary_errmsg, sizeof(secondary_errmsg))) {
3252 for (i = 0; i < capture_opts->ifaces->len; i++) {
3253 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3254 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3255 /* init the input filter from the network interface (capture pipe will do nothing) */
3257 * When remote capturing WinPCap crashes when the capture filter
3258 * is NULL. This might be a bug in WPCap. Therefore we provide an empty
3261 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3262 interface_opts.name,
3263 interface_opts.cfilter?interface_opts.cfilter:"")) {
3265 case INITFILTER_NO_ERROR:
3268 case INITFILTER_BAD_FILTER:
3269 cfilter_error = TRUE;
3271 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3274 case INITFILTER_OTHER_ERROR:
3275 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3276 pcap_geterr(pcap_opts->pcap_h));
3277 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3282 /* If we're supposed to write to a capture file, open it for output
3283 (temporary/specified name/ringbuffer) */
3284 if (capture_opts->saving_to_file) {
3285 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3286 errmsg, sizeof(errmsg))) {
3290 /* set up to write to the already-opened capture output file/files */
3291 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3296 /* XXX - capture SIGTERM and close the capture, in case we're on a
3297 Linux 2.0[.x] system and you have to explicitly close the capture
3298 stream in order to turn promiscuous mode off? We need to do that
3299 in other places as well - and I don't think that works all the
3300 time in any case, due to libpcap bugs. */
3302 /* Well, we should be able to start capturing.
3304 Sync out the capture file, so the header makes it to the file system,
3305 and send a "capture started successfully and capture file created"
3306 message to our parent so that they'll open the capture file and
3307 update its windows to indicate that we have a live capture in
3309 libpcap_dump_flush(global_ld.pdh, NULL);
3310 report_new_capture_file(capture_opts->save_file);
3313 /* initialize capture stop (and alike) conditions */
3314 init_capture_stop_conditions();
3315 /* create stop conditions */
3316 if (capture_opts->has_autostop_filesize)
3318 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3319 if (capture_opts->has_autostop_duration)
3320 cnd_autostop_duration =
3321 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3323 if (capture_opts->multi_files_on) {
3324 if (capture_opts->has_file_duration)
3326 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3328 if (capture_opts->has_autostop_files)
3329 cnd_autostop_files =
3330 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3333 /* init the time values */
3335 upd_time = GetTickCount();
3337 gettimeofday(&upd_time, NULL);
3339 start_time = create_timestamp();
3340 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3342 /* WOW, everything is prepared! */
3343 /* please fasten your seat belts, we will enter now the actual capture loop */
3345 pcap_queue = g_async_queue_new();
3346 pcap_queue_bytes = 0;
3347 pcap_queue_packets = 0;
3348 for (i = 0; i < global_ld.pcaps->len; i++) {
3349 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3350 #if GLIB_CHECK_VERSION(2,31,0)
3351 /* XXX - Add an interface name here? */
3352 pcap_opts->tid = g_thread_new("Capture read", pcap_read_handler, pcap_opts);
3354 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3358 while (global_ld.go) {
3359 /* dispatch incoming packets */
3361 pcap_queue_element *queue_element;
3362 #if GLIB_CHECK_VERSION(2,31,18)
3364 queue_element = g_async_queue_timeout_pop_unlocked(pcap_queue, WRITER_THREAD_TIMEOUT);
3366 GTimeVal write_thread_time;
3368 g_get_current_time(&write_thread_time);
3369 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3370 g_async_queue_lock(pcap_queue);
3371 queue_element = g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3373 if (queue_element) {
3374 pcap_queue_bytes -= queue_element->phdr.caplen;
3375 pcap_queue_packets -= 1;
3377 g_async_queue_unlock(pcap_queue);
3378 if (queue_element) {
3379 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3380 "Dequeued a packet of length %d captured on interface %d.",
3381 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3383 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3384 &queue_element->phdr,
3386 g_free(queue_element->pd);
3387 g_free(queue_element);
3393 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3394 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3395 sizeof(errmsg), pcap_opts);
3398 /* Were we asked to print packet counts by the SIGINFO handler? */
3399 if (global_ld.report_packet_count) {
3400 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3401 plurality(global_ld.packet_count, "", "s"));
3402 global_ld.report_packet_count = FALSE;
3407 /* any news from our parent (signal pipe)? -> just stop the capture */
3408 if (!signal_pipe_check_running()) {
3409 global_ld.go = FALSE;
3414 global_ld.inpkts_to_sync_pipe += inpkts;
3416 /* check capture size condition */
3417 if (cnd_autostop_size != NULL &&
3418 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3419 /* Capture size limit reached, do we have another file? */
3420 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3421 cnd_autostop_size, cnd_file_duration))
3423 } /* cnd_autostop_size */
3424 if (capture_opts->output_to_pipe) {
3425 libpcap_dump_flush(global_ld.pdh, NULL);
3429 /* Only update once every 500ms so as not to overload slow displays.
3430 * This also prevents too much context-switching between the dumpcap
3431 * and wireshark processes.
3433 #define DUMPCAP_UPD_TIME 500
3436 cur_time = GetTickCount(); /* Note: wraps to 0 if sys runs for 49.7 days */
3437 if ((cur_time - upd_time) > DUMPCAP_UPD_TIME) { /* wrap just causes an extra update */
3439 gettimeofday(&cur_time, NULL);
3440 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3441 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3444 upd_time = cur_time;
3447 if (pcap_stats(pch, stats) >= 0) {
3448 *stats_known = TRUE;
3451 /* Let the parent process know. */
3452 if (global_ld.inpkts_to_sync_pipe) {
3454 libpcap_dump_flush(global_ld.pdh, NULL);
3456 /* Send our parent a message saying we've written out
3457 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3459 report_packet_count(global_ld.inpkts_to_sync_pipe);
3461 global_ld.inpkts_to_sync_pipe = 0;
3464 /* check capture duration condition */
3465 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3466 /* The maximum capture time has elapsed; stop the capture. */
3467 global_ld.go = FALSE;
3471 /* check capture file duration condition */
3472 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3473 /* duration limit reached, do we have another file? */
3474 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3475 cnd_autostop_size, cnd_file_duration))
3477 } /* cnd_file_duration */
3481 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3483 pcap_queue_element *queue_element;
3485 for (i = 0; i < global_ld.pcaps->len; i++) {
3486 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3487 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3488 pcap_opts->interface_id);
3489 g_thread_join(pcap_opts->tid);
3490 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3491 pcap_opts->interface_id);
3494 g_async_queue_lock(pcap_queue);
3495 queue_element = g_async_queue_try_pop_unlocked(pcap_queue);
3496 if (queue_element) {
3497 pcap_queue_bytes -= queue_element->phdr.caplen;
3498 pcap_queue_packets -= 1;
3500 g_async_queue_unlock(pcap_queue);
3501 if (queue_element == NULL) {
3504 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3505 "Dequeued a packet of length %d captured on interface %d.",
3506 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3507 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3508 &queue_element->phdr,
3510 g_free(queue_element->pd);
3511 g_free(queue_element);
3512 global_ld.inpkts_to_sync_pipe += 1;
3513 if (capture_opts->output_to_pipe) {
3514 libpcap_dump_flush(global_ld.pdh, NULL);
3520 /* delete stop conditions */
3521 if (cnd_file_duration != NULL)
3522 cnd_delete(cnd_file_duration);
3523 if (cnd_autostop_files != NULL)
3524 cnd_delete(cnd_autostop_files);
3525 if (cnd_autostop_size != NULL)
3526 cnd_delete(cnd_autostop_size);
3527 if (cnd_autostop_duration != NULL)
3528 cnd_delete(cnd_autostop_duration);
3530 /* did we have a pcap (input) error? */
3531 for (i = 0; i < capture_opts->ifaces->len; i++) {
3532 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3533 if (pcap_opts->pcap_err) {
3534 /* On Linux, if an interface goes down while you're capturing on it,
3535 you'll get a "recvfrom: Network is down" or
3536 "The interface went down" error (ENETDOWN).
3537 (At least you will if g_strerror() doesn't show a local translation
3540 On FreeBSD and OS X, if a network adapter disappears while
3541 you're capturing on it, you'll get a "read: Device not configured"
3542 error (ENXIO). (See previous parenthetical note.)
3544 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3546 These should *not* be reported to the Wireshark developers. */
3549 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3550 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3551 strcmp(cap_err_str, "The interface went down") == 0 ||
3552 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3553 strcmp(cap_err_str, "read: I/O error") == 0 ||
3554 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3555 report_capture_error("The network adapter on which the capture was being done "
3556 "is no longer running; the capture has stopped.",
3559 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3561 report_capture_error(errmsg, please_report);
3564 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3565 report_capture_error(errmsg, "");
3569 /* did we have an output error while capturing? */
3570 if (global_ld.err == 0) {
3573 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3574 global_ld.err, FALSE);
3575 report_capture_error(errmsg, please_report);
3579 if (capture_opts->saving_to_file) {
3580 /* close the output file */
3581 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3585 /* there might be packets not yet notified to the parent */
3586 /* (do this after closing the file, so all packets are already flushed) */
3587 if(global_ld.inpkts_to_sync_pipe) {
3589 report_packet_count(global_ld.inpkts_to_sync_pipe);
3590 global_ld.inpkts_to_sync_pipe = 0;
3593 /* If we've displayed a message about a write error, there's no point
3594 in displaying another message about an error on close. */
3595 if (!close_ok && write_ok) {
3596 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3598 report_capture_error(errmsg, "");
3602 * XXX We exhibit different behaviour between normal mode and sync mode
3603 * when the pipe is stdin and not already at EOF. If we're a child, the
3604 * parent's stdin isn't closed, so if the user starts another capture,
3605 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3606 * will say "Unrecognized libpcap format". On the other hand, in normal
3607 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3610 report_capture_count(TRUE);
3612 /* get packet drop statistics from pcap */
3613 for (i = 0; i < capture_opts->ifaces->len; i++) {
3617 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3618 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3619 received = pcap_opts->received;
3620 dropped = pcap_opts->dropped;
3621 if (pcap_opts->pcap_h != NULL) {
3622 g_assert(!pcap_opts->from_cap_pipe);
3623 /* Get the capture statistics, so we know how many packets were dropped. */
3624 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3625 *stats_known = TRUE;
3626 /* Let the parent process know. */
3627 dropped += stats->ps_drop;
3629 g_snprintf(errmsg, sizeof(errmsg),
3630 "Can't get packet-drop statistics: %s",
3631 pcap_geterr(pcap_opts->pcap_h));
3632 report_capture_error(errmsg, please_report);
3635 report_packet_drops(received, dropped, interface_opts.name);
3638 /* close the input file (pcap or capture pipe) */
3639 capture_loop_close_input(&global_ld);
3641 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3643 /* ok, if the write and the close were successful. */
3644 return write_ok && close_ok;
3647 if (capture_opts->multi_files_on) {
3648 /* cleanup ringbuffer */
3649 ringbuf_error_cleanup();
3651 /* We can't use the save file, and we have no FILE * for the stream
3652 to close in order to close it, so close the FD directly. */
3653 if (global_ld.save_file_fd != -1) {
3654 ws_close(global_ld.save_file_fd);
3657 /* We couldn't even start the capture, so get rid of the capture
3659 if (capture_opts->save_file != NULL) {
3660 ws_unlink(capture_opts->save_file);
3661 g_free(capture_opts->save_file);
3664 capture_opts->save_file = NULL;
3666 report_cfilter_error(capture_opts, error_index, errmsg);
3668 report_capture_error(errmsg, secondary_errmsg);
3670 /* close the input file (pcap or cap_pipe) */
3671 capture_loop_close_input(&global_ld);
3673 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3679 static void capture_loop_stop(void)
3681 #ifdef HAVE_PCAP_BREAKLOOP
3683 pcap_options *pcap_opts;
3685 for (i = 0; i < global_ld.pcaps->len; i++) {
3686 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3687 if (pcap_opts->pcap_h != NULL)
3688 pcap_breakloop(pcap_opts->pcap_h);
3691 global_ld.go = FALSE;
3696 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3697 int err, gboolean is_close)
3702 g_snprintf(errmsg, errmsglen,
3703 "Not all the packets could be written to the file"
3704 " to which the capture was being saved\n"
3705 "(\"%s\") because there is no space left on the file system\n"
3706 "on which that file resides.",
3712 g_snprintf(errmsg, errmsglen,
3713 "Not all the packets could be written to the file"
3714 " to which the capture was being saved\n"
3715 "(\"%s\") because you are too close to, or over,"
3716 " your disk quota\n"
3717 "on the file system on which that file resides.",
3724 g_snprintf(errmsg, errmsglen,
3725 "The file to which the capture was being saved\n"
3726 "(\"%s\") could not be closed: %s.",
3727 fname, g_strerror(err));
3729 g_snprintf(errmsg, errmsglen,
3730 "An error occurred while writing to the file"
3731 " to which the capture was being saved\n"
3733 fname, g_strerror(err));
3740 /* one packet was captured, process it */
3742 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3745 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3747 guint ts_mul = pcap_opts->ts_nsec ? 1000000000 : 1000000;
3749 /* We may be called multiple times from pcap_dispatch(); if we've set
3750 the "stop capturing" flag, ignore this packet, as we're not
3751 supposed to be saving any more packets. */
3755 if (global_ld.pdh) {
3756 gboolean successful;
3758 /* We're supposed to write the packet to a file; do so.
3759 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3760 "ld->err" to the error. */
3761 if (global_capture_opts.use_pcapng) {
3762 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, pcap_opts->interface_id, ts_mul, pd, &global_ld.bytes_written, &err);
3764 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3767 global_ld.go = FALSE;
3768 global_ld.err = err;
3770 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3771 "Wrote a packet of length %d captured on interface %u.",
3772 phdr->caplen, pcap_opts->interface_id);
3773 global_ld.packet_count++;
3774 pcap_opts->received++;
3775 /* if the user told us to stop after x packets, do we already have enough? */
3776 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3777 global_ld.go = FALSE;
3783 /* one packet was captured, queue it */
3785 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3788 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3789 pcap_queue_element *queue_element;
3790 gboolean limit_reached;
3792 /* We may be called multiple times from pcap_dispatch(); if we've set
3793 the "stop capturing" flag, ignore this packet, as we're not
3794 supposed to be saving any more packets. */
3798 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3799 if (queue_element == NULL) {
3800 pcap_opts->dropped++;
3803 queue_element->pcap_opts = pcap_opts;
3804 queue_element->phdr = *phdr;
3805 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3806 if (queue_element->pd == NULL) {
3807 pcap_opts->dropped++;
3808 g_free(queue_element);
3811 memcpy(queue_element->pd, pd, phdr->caplen);
3812 g_async_queue_lock(pcap_queue);
3813 if (((pcap_queue_byte_limit > 0) && (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3814 ((pcap_queue_packet_limit > 0) && (pcap_queue_packets < pcap_queue_packet_limit))) {
3815 limit_reached = FALSE;
3816 g_async_queue_push_unlocked(pcap_queue, queue_element);
3817 pcap_queue_bytes += phdr->caplen;
3818 pcap_queue_packets += 1;
3820 limit_reached = TRUE;
3822 g_async_queue_unlock(pcap_queue);
3823 if (limit_reached) {
3824 pcap_opts->dropped++;
3825 g_free(queue_element->pd);
3826 g_free(queue_element);
3827 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3828 "Dropped a packet of length %d captured on interface %u.",
3829 phdr->caplen, pcap_opts->interface_id);
3831 pcap_opts->received++;
3832 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3833 "Queued a packet of length %d captured on interface %u.",
3834 phdr->caplen, pcap_opts->interface_id);
3836 /* I don't want to hold the mutex over the debug output. So the
3837 output may be wrong */
3838 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3839 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3840 pcap_queue_bytes, pcap_queue_packets);
3843 /* And now our feature presentation... [ fade to music ] */
3845 main(int argc, char *argv[])
3848 gboolean arg_error = FALSE;
3853 struct sigaction action, oldaction;
3856 gboolean start_capture = TRUE;
3857 gboolean stats_known;
3858 struct pcap_stat stats;
3859 GLogLevelFlags log_flags;
3860 gboolean list_interfaces = FALSE;
3861 gboolean list_link_layer_types = FALSE;
3862 #ifdef HAVE_BPF_IMAGE
3863 gboolean print_bpf_code = FALSE;
3865 gboolean machine_readable = FALSE;
3866 gboolean print_statistics = FALSE;
3867 int status, run_once_args = 0;
3870 #if defined(__APPLE__) && defined(__LP64__)
3871 struct utsname osinfo;
3876 arg_list_utf_16to8(argc, argv);
3881 * Initialize our DLL search path. MUST be called before LoadLibrary
3884 ws_init_dll_search_path();
3887 #ifdef HAVE_PCAP_REMOTE
3888 #define OPTSTRING_A "A:"
3889 #define OPTSTRING_r "r"
3890 #define OPTSTRING_u "u"
3892 #define OPTSTRING_A ""
3893 #define OPTSTRING_r ""
3894 #define OPTSTRING_u ""
3897 #ifdef HAVE_PCAP_SETSAMPLING
3898 #define OPTSTRING_m "m:"
3900 #define OPTSTRING_m ""
3903 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3904 #define OPTSTRING_B "B:"
3906 #define OPTSTRING_B ""
3907 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3909 #ifdef HAVE_PCAP_CREATE
3910 #define OPTSTRING_I "I"
3912 #define OPTSTRING_I ""
3915 #ifdef HAVE_BPF_IMAGE
3916 #define OPTSTRING_d "d"
3918 #define OPTSTRING_d ""
3921 #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:"
3923 #ifdef DEBUG_CHILD_DUMPCAP
3924 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3925 fprintf (stderr, "Unable to open debug log file !\n");
3930 #if defined(__APPLE__) && defined(__LP64__)
3932 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3933 * a bug workaround - timeouts less than 1 second don't work with libpcap
3934 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3935 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3936 * The problem is extremely unlikely to be reintroduced in a future
3939 if (uname(&osinfo) == 0) {
3941 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3942 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3943 * number of 10.0.0, not 10.1.0 - go figure).
3945 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3946 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3947 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3948 need_timeout_workaround = TRUE;
3953 * Determine if dumpcap is being requested to run in a special
3954 * capture_child mode by going thru the command line args to see if
3955 * a -Z is present. (-Z is a hidden option).
3957 * The primary result of running in capture_child mode is that
3958 * all messages sent out on stderr are in a special type/len/string
3959 * format to allow message processing by type. These messages include
3960 * error messages if dumpcap fails to start the operation it was
3961 * requested to do, as well as various "status" messages which are sent
3962 * when an actual capture is in progress, and a "success" message sent
3963 * if dumpcap was requested to perform an operation other than a
3966 * Capture_child mode would normally be requested by a parent process
3967 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3968 * to which dumpcap stderr has been redirected. It might also have
3969 * another pipe to obtain dumpcap stdout output; for operations other
3970 * than a capture, that information is formatted specially for easier
3971 * parsing by the parent process.
3973 * Capture_child mode needs to be determined immediately upon
3974 * startup so that any messages generated by dumpcap in this mode
3975 * (eg: during initialization) will be formatted properly.
3978 for (i=1; i<argc; i++) {
3979 if (strcmp("-Z", argv[i]) == 0) {
3980 capture_child = TRUE;
3981 machine_readable = TRUE; /* request machine-readable output */
3983 /* set output pipe to binary mode, to avoid ugly text conversions */
3984 _setmode(2, O_BINARY);
3989 /* The default_log_handler will use stdout, which makes trouble in */
3990 /* capture child mode, as it uses stdout for it's sync_pipe. */
3991 /* So: the filtering is done in the console_log_handler and not here.*/
3992 /* We set the log handlers right up front to make sure that any log */
3993 /* messages when running as child will be sent back to the parent */
3994 /* with the correct format. */
3998 G_LOG_LEVEL_CRITICAL|
3999 G_LOG_LEVEL_WARNING|
4000 G_LOG_LEVEL_MESSAGE|
4003 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
4005 g_log_set_handler(NULL,
4007 console_log_handler, NULL /* user_data */);
4008 g_log_set_handler(LOG_DOMAIN_MAIN,
4010 console_log_handler, NULL /* user_data */);
4011 g_log_set_handler(LOG_DOMAIN_CAPTURE,
4013 console_log_handler, NULL /* user_data */);
4014 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
4016 console_log_handler, NULL /* user_data */);
4018 /* Initialize the pcaps list */
4019 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
4021 #if !GLIB_CHECK_VERSION(2,31,0)
4022 /* Initialize the thread system */
4023 g_thread_init(NULL);
4027 /* Load wpcap if possible. Do this before collecting the run-time version information */
4030 /* ... and also load the packet.dll from wpcap */
4031 /* XXX - currently not required, may change later. */
4032 /*wpcap_packet_load();*/
4034 /* Start windows sockets */
4035 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
4037 /* Set handler for Ctrl+C key */
4038 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
4040 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
4042 action.sa_handler = capture_cleanup_handler;
4044 * Arrange that system calls not get restarted, because when
4045 * our signal handler returns we don't want to restart
4046 * a call that was waiting for packets to arrive.
4048 action.sa_flags = 0;
4049 sigemptyset(&action.sa_mask);
4050 sigaction(SIGTERM, &action, NULL);
4051 sigaction(SIGINT, &action, NULL);
4052 sigaction(SIGPIPE, &action, NULL);
4053 sigaction(SIGHUP, NULL, &oldaction);
4054 if (oldaction.sa_handler == SIG_DFL)
4055 sigaction(SIGHUP, &action, NULL);
4058 /* Catch SIGINFO and, if we get it and we're capturing in
4059 quiet mode, report the number of packets we've captured. */
4060 action.sa_handler = report_counts_siginfo;
4061 action.sa_flags = SA_RESTART;
4062 sigemptyset(&action.sa_mask);
4063 sigaction(SIGINFO, &action, NULL);
4064 #endif /* SIGINFO */
4067 /* ----------------------------------------------------------------- */
4068 /* Privilege and capability handling */
4070 /* 1. Running not as root or suid root; no special capabilities. */
4073 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
4076 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
4078 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4079 /* capabilities; Drop all other capabilities; */
4080 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4081 /* else: after pcap_open_live() in capture_loop_open_input() */
4082 /* drop all capabilities (NET_RAW and NET_ADMIN); */
4083 /* (Note: this means that the process, although logged in */
4084 /* as root, does not have various permissions such as the */
4085 /* ability to bypass file access permissions). */
4086 /* XXX: Should we just leave capabilities alone in this case */
4087 /* so that user gets expected effect that root can do */
4090 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
4092 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4093 /* else: after pcap_open_live() in capture_loop_open_input() */
4094 /* drop suid root (set euid=ruid).(ie: keep suid until after */
4095 /* pcap_open_live). */
4097 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
4099 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
4100 /* capabilities; Drop all other capabilities; */
4101 /* Drop suid privileges (euid=ruid); */
4102 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4103 /* else: after pcap_open_live() in capture_loop_open_input() */
4104 /* drop all capabilities (NET_RAW and NET_ADMIN). */
4106 /* XXX: For some Linux versions/distros with capabilities */
4107 /* a 'normal' process with any capabilities cannot be */
4108 /* 'killed' (signaled) from another (same uid) non-privileged */
4110 /* For example: If (non-suid) Wireshark forks a */
4111 /* child suid dumpcap which acts as described here (case 5), */
4112 /* Wireshark will be unable to kill (signal) the child */
4113 /* dumpcap process until the capabilities have been dropped */
4114 /* (after pcap_open_live()). */
4115 /* This behaviour will apparently be changed in the kernel */
4116 /* to allow the kill (signal) in this case. */
4117 /* See the following for details: */
4118 /* http://www.mail-archive.com/ [wrapped] */
4119 /* linux-security-module@vger.kernel.org/msg02913.html */
4121 /* It is therefore conceivable that if dumpcap somehow hangs */
4122 /* in pcap_open_live or before that wireshark will not */
4123 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
4124 /* In this case, exiting wireshark will kill the child */
4125 /* dumpcap process. */
4127 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
4128 /* capabilities; Using libcap. Note: capset cmd (which see) */
4129 /* used to assign capabilities to file. */
4131 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
4132 /* else: after pcap_open_live() in capture_loop_open_input() */
4133 /* drop all capabilities (NET_RAW and NET_ADMIN) */
4135 /* ToDo: -S (stats) should drop privileges/capabilities when no */
4136 /* longer required (similar to capture). */
4138 /* ----------------------------------------------------------------- */
4140 init_process_policies();
4143 /* If 'started with special privileges' (and using libcap) */
4144 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
4145 /* Set euid/egid = ruid/rgid to remove suid privileges */
4146 relinquish_privs_except_capture();
4149 /* Set the initial values in the capture options. This might be overwritten
4150 by the command line parameters. */
4151 capture_opts_init(&global_capture_opts, NULL);
4153 /* We always save to a file - if no file was specified, we save to a
4155 global_capture_opts.saving_to_file = TRUE;
4156 global_capture_opts.has_ring_num_files = TRUE;
4158 /* Now get our args */
4159 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
4161 case 'h': /* Print help and exit */
4165 case 'v': /* Show version and exit */
4167 GString *comp_info_str;
4168 GString *runtime_info_str;
4169 /* Assemble the compile-time version information string */
4170 comp_info_str = g_string_new("Compiled ");
4171 get_compiled_version_info(comp_info_str, NULL, NULL);
4173 /* Assemble the run-time version information string */
4174 runtime_info_str = g_string_new("Running ");
4175 get_runtime_version_info(runtime_info_str, NULL);
4176 show_version(comp_info_str, runtime_info_str);
4177 g_string_free(comp_info_str, TRUE);
4178 g_string_free(runtime_info_str, TRUE);
4182 /*** capture option specific ***/
4183 case 'a': /* autostop criteria */
4184 case 'b': /* Ringbuffer option */
4185 case 'c': /* Capture x packets */
4186 case 'f': /* capture filter */
4187 case 'i': /* Use interface x */
4188 case 'n': /* Use pcapng format */
4189 case 'p': /* Don't capture in promiscuous mode */
4190 case 'P': /* Use pcap format */
4191 case 's': /* Set the snapshot (capture) length */
4192 case 'w': /* Write to capture file x */
4193 case 'g': /* enable group read accesson file(s) */
4194 case 'y': /* Set the pcap data link type */
4195 #ifdef HAVE_PCAP_REMOTE
4196 case 'u': /* Use UDP for data transfer */
4197 case 'r': /* Capture own RPCAP traffic too */
4198 case 'A': /* Authentication */
4200 #ifdef HAVE_PCAP_SETSAMPLING
4201 case 'm': /* Sampling */
4203 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4204 case 'B': /* Buffer size */
4205 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4206 #ifdef HAVE_PCAP_CREATE
4207 case 'I': /* Monitor mode */
4209 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4214 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4216 capture_child = TRUE;
4218 /* set output pipe to binary mode, to avoid ugly text conversions */
4219 _setmode(2, O_BINARY);
4221 * optarg = the control ID, aka the PPID, currently used for the
4224 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4225 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4226 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4227 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4229 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4230 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4231 "Signal pipe: Unable to open %s. Dead parent?",
4239 case 'q': /* Quiet */
4245 /*** all non capture option specific ***/
4246 case 'D': /* Print a list of capture devices and exit */
4247 list_interfaces = TRUE;
4250 case 'L': /* Print list of link-layer types and exit */
4251 list_link_layer_types = TRUE;
4254 #ifdef HAVE_BPF_IMAGE
4255 case 'd': /* Print BPF code for capture filter and exit */
4256 print_bpf_code = TRUE;
4260 case 'S': /* Print interface statistics once a second */
4261 print_statistics = TRUE;
4264 case 'M': /* For -D, -L, and -S, print machine-readable output */
4265 machine_readable = TRUE;
4268 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4270 case '?': /* Bad flag - print usage message */
4279 /* user specified file name as regular command-line argument */
4280 /* XXX - use it as the capture file name (or something else)? */
4286 * Extra command line arguments were specified; complain.
4287 * XXX - interpret as capture filter, as tcpdump and tshark do?
4289 cmdarg_err("Invalid argument: %s", argv[0]);
4299 if (run_once_args > 1) {
4300 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4302 } else if (run_once_args == 1) {
4303 /* We're supposed to print some information, rather than
4304 to capture traffic; did they specify a ring buffer option? */
4305 if (global_capture_opts.multi_files_on) {
4306 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4310 /* We're supposed to capture traffic; */
4311 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4312 if (global_capture_opts.ifaces->len > 1) {
4314 global_capture_opts.use_pcapng = TRUE;
4316 /* Was the ring buffer option specified and, if so, does it make sense? */
4317 if (global_capture_opts.multi_files_on) {
4318 /* Ring buffer works only under certain conditions:
4319 a) ring buffer does not work with temporary files;
4320 b) it makes no sense to enable the ring buffer if the maximum
4321 file size is set to "infinite". */
4322 if (global_capture_opts.save_file == NULL) {
4323 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4324 global_capture_opts.multi_files_on = FALSE;
4326 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4327 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4329 /* XXX - this must be redesigned as the conditions changed */
4330 global_capture_opts.multi_files_on = FALSE;
4337 * "-D" requires no interface to be selected; it's supposed to list
4340 if (list_interfaces) {
4341 /* Get the list of interfaces */
4346 if_list = capture_interface_list(&err, &err_str);
4347 if (if_list == NULL) {
4349 case CANT_GET_INTERFACE_LIST:
4350 case DONT_HAVE_PCAP:
4351 cmdarg_err("%s", err_str);
4356 case NO_INTERFACES_FOUND:
4358 * If we're being run by another program, just give them
4359 * an empty list of interfaces, don't report this as
4360 * an error; that lets them decide whether to report
4361 * this as an error or not.
4363 if (!machine_readable) {
4364 cmdarg_err("There are no interfaces on which a capture can be done");
4371 if (machine_readable) /* tab-separated values to stdout */
4372 print_machine_readable_interfaces(if_list);
4374 capture_opts_print_interfaces(if_list);
4375 free_interface_list(if_list);
4380 * "-S" requires no interface to be selected; it gives statistics
4381 * for all interfaces.
4383 if (print_statistics) {
4384 status = print_statistics_loop(machine_readable);
4389 * "-L", "-d", and capturing act on a particular interface, so we have to
4390 * have an interface; if none was specified, pick a default.
4392 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4393 /* cmdarg_err() already called .... */
4397 /* Let the user know what interfaces were chosen. */
4398 /* get_interface_descriptive_name() is not available! */
4399 if (capture_child) {
4400 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4401 interface_options interface_opts;
4403 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4404 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n",
4405 interface_opts.name);
4408 str = g_string_new("");
4410 if (global_capture_opts.ifaces->len < 2) {
4412 if (global_capture_opts.ifaces->len < 4) {
4414 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4415 interface_options interface_opts;
4417 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4419 if (global_capture_opts.ifaces->len > 2) {
4420 g_string_append_printf(str, ",");
4422 g_string_append_printf(str, " ");
4423 if (j == global_capture_opts.ifaces->len - 1) {
4424 g_string_append_printf(str, "and ");
4427 g_string_append_printf(str, "%s", interface_opts.name);
4430 g_string_append_printf(str, "%u interfaces", global_capture_opts.ifaces->len);
4432 fprintf(stderr, "Capturing on %s\n", str->str);
4433 g_string_free(str, TRUE);
4436 if (list_link_layer_types) {
4437 /* Get the list of link-layer types for the capture device. */
4438 if_capabilities_t *caps;
4442 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4443 interface_options interface_opts;
4445 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4446 caps = get_if_capabilities(interface_opts.name,
4447 interface_opts.monitor_mode, &err_str);
4449 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4450 "Please check to make sure you have sufficient permissions, and that\n"
4451 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4455 if (caps->data_link_types == NULL) {
4456 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4459 if (machine_readable) /* tab-separated values to stdout */
4460 /* XXX: We need to change the format and adopt consumers */
4461 print_machine_readable_if_capabilities(caps);
4463 /* XXX: We might want to print also the interface name */
4464 capture_opts_print_if_capabilities(caps, interface_opts.name,
4465 interface_opts.monitor_mode);
4466 free_if_capabilities(caps);
4471 /* We're supposed to do a capture, or print the BPF code for a filter.
4472 Process the snapshot length, as that affects the generated BPF code. */
4473 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4475 #ifdef HAVE_BPF_IMAGE
4476 if (print_bpf_code) {
4477 show_filter_code(&global_capture_opts);
4482 /* We're supposed to do a capture. Process the ring buffer arguments. */
4483 capture_opts_trim_ring_num_files(&global_capture_opts);
4485 /* Now start the capture. */
4487 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4491 /* capture failed */
4494 return 0; /* never here, make compiler happy */
4499 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4500 const char *message, gpointer user_data _U_)
4507 /* ignore log message, if log_level isn't interesting */
4508 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4509 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4514 /* create a "timestamp" */
4516 today = localtime(&curr);
4518 switch(log_level & G_LOG_LEVEL_MASK) {
4519 case G_LOG_LEVEL_ERROR:
4522 case G_LOG_LEVEL_CRITICAL:
4525 case G_LOG_LEVEL_WARNING:
4528 case G_LOG_LEVEL_MESSAGE:
4531 case G_LOG_LEVEL_INFO:
4534 case G_LOG_LEVEL_DEBUG:
4538 fprintf(stderr, "unknown log_level %u\n", log_level);
4540 g_assert_not_reached();
4543 /* Generate the output message */
4544 if(log_level & G_LOG_LEVEL_MESSAGE) {
4545 /* normal user messages without additional infos */
4546 msg = g_strdup_printf("%s\n", message);
4548 /* info/debug messages with additional infos */
4549 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4550 today->tm_hour, today->tm_min, today->tm_sec,
4551 log_domain != NULL ? log_domain : "",
4555 /* DEBUG & INFO msgs (if we're debugging today) */
4556 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4557 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4558 #ifdef DEBUG_DUMPCAP
4559 fprintf(stderr, "%s", msg);
4562 #ifdef DEBUG_CHILD_DUMPCAP
4563 fprintf(debug_log, "%s", msg);
4571 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4572 /* to parent especially formatted if dumpcap running as child. */
4573 if (capture_child) {
4574 sync_pipe_errmsg_to_parent(2, msg, "");
4576 fprintf(stderr, "%s", msg);
4583 /****************************************************************************************************************/
4584 /* indication report routines */
4588 report_packet_count(int packet_count)
4590 char tmp[SP_DECISIZE+1+1];
4591 static int count = 0;
4594 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4595 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4596 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4598 count += packet_count;
4599 fprintf(stderr, "\rPackets: %u ", count);
4600 /* stderr could be line buffered */
4606 report_new_capture_file(const char *filename)
4609 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4610 pipe_write_block(2, SP_FILE, filename);
4614 * Prevent a SIGINFO handler from writing to the standard error
4615 * while we're doing so; instead, have it just set a flag telling
4616 * us to print that information when we're done.
4619 #endif /* SIGINFO */
4620 fprintf(stderr, "File: %s\n", filename);
4621 /* stderr could be line buffered */
4626 * Allow SIGINFO handlers to write.
4631 * If a SIGINFO handler asked us to write out capture counts, do so.
4634 report_counts_for_siginfo();
4635 #endif /* SIGINFO */
4640 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4642 interface_options interface_opts;
4643 char tmp[MSG_MAX_LENGTH+1+6];
4645 if (i < capture_opts->ifaces->len) {
4646 if (capture_child) {
4647 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4648 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4649 pipe_write_block(2, SP_BAD_FILTER, tmp);
4652 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4653 * the error message below.
4655 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4657 "Invalid capture filter: \"%s\" for interface %s!\n"
4659 "That string isn't a valid capture filter (%s).\n"
4660 "See the User's Guide for a description of the capture filter syntax.",
4661 interface_opts.cfilter, interface_opts.name, errmsg);
4667 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4670 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4671 "Primary Error: %s", error_msg);
4672 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4673 "Secondary Error: %s", secondary_error_msg);
4674 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4676 cmdarg_err("%s", error_msg);
4677 if (secondary_error_msg[0] != '\0')
4678 cmdarg_err_cont("%s", secondary_error_msg);
4683 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4685 char tmp[SP_DECISIZE+1+1];
4687 g_snprintf(tmp, sizeof(tmp), "%u", drops);
4690 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4691 "Packets received/dropped on interface %s: %u/%u",
4692 name, received, drops);
4693 /* XXX: Need to provide interface id, changes to consumers required. */
4694 pipe_write_block(2, SP_DROPS, tmp);
4697 "Packets received/dropped on interface %s: %u/%u (%.1f%%)\n",
4698 name, received, drops,
4699 received ? 100.0 * received / (received + drops) : 0.0);
4700 /* stderr could be line buffered */
4706 /****************************************************************************************************************/
4707 /* signal_pipe handling */
4712 signal_pipe_check_running(void)
4714 /* any news from our parent? -> just stop the capture */
4718 /* if we are running standalone, no check required */
4719 if(!capture_child) {
4723 if(!sig_pipe_name || !sig_pipe_handle) {
4724 /* This shouldn't happen */
4725 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4726 "Signal pipe: No name or handle");
4731 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4732 * at this point. Should we check to see if the parent is still alive,
4733 * e.g. by using OpenProcess?
4736 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4738 if(!result || avail > 0) {
4739 /* peek failed or some bytes really available */
4740 /* (if not piping from stdin this would fail) */
4741 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4742 "Signal pipe: Stop capture: %s", sig_pipe_name);
4743 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4744 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4745 sig_pipe_handle, result, avail);
4748 /* pipe ok and no bytes available */
4755 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4760 * indent-tabs-mode: nil
4763 * vi: set shiftwidth=4 tabstop=8 expandtab:
4764 * :indentSize=4:tabSize=8:noTabs=true: