5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
65 #include "wsutil/wsgetopt.h"
73 # include <sys/prctl.h>
74 # include <sys/capability.h>
77 #include "ringbuffer.h"
78 #include "clopts_common.h"
79 #include "console_io.h"
80 #include "cmdarg_err.h"
81 #include "version_info.h"
83 #include "capture-pcap-util.h"
88 #include "capture-wpcap.h"
89 #include <wsutil/unicode-utils.h>
93 #include <sys/socket.h>
97 #ifdef NEED_INET_V6DEFS_H
98 # include "wsutil/inet_v6defs.h"
101 #include <wsutil/privileges.h>
103 #include "sync_pipe.h"
105 #include "capture_opts.h"
106 #include "capture_ifinfo.h"
107 #include "capture_sync.h"
109 #include "conditions.h"
110 #include "capture_stop_conditions.h"
112 #include "tempfile.h"
114 #include "wsutil/file_util.h"
117 * Get information about libpcap format from "wiretap/libpcap.h".
118 * XXX - can we just use pcap_open_offline() to read the pipe?
120 #include "wiretap/libpcap.h"
122 /**#define DEBUG_DUMPCAP**/
123 /**#define DEBUG_CHILD_DUMPCAP**/
127 #include <conio.h> /* _getch() */
131 #ifdef DEBUG_CHILD_DUMPCAP
132 FILE *debug_log; /* for logging debug messages to */
133 /* a file if DEBUG_CHILD_DUMPCAP */
141 static GAsyncQueue *pcap_queue;
142 static gint64 pcap_queue_bytes;
143 static gint64 pcap_queue_packets;
144 static gint64 pcap_queue_byte_limit = 1024 * 1024;
145 static gint64 pcap_queue_packet_limit = 1000;
147 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
149 static gchar *sig_pipe_name = NULL;
150 static HANDLE sig_pipe_handle = NULL;
151 static gboolean signal_pipe_check_running(void);
155 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
156 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
159 /** Stop a low-level capture (stops the capture child). */
160 static void capture_loop_stop(void);
162 #if !defined (__linux__)
163 #ifndef HAVE_PCAP_BREAKLOOP
165 * We don't have pcap_breakloop(), which is the only way to ensure that
166 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
167 * won't, if the call to read the next packet or batch of packets is
168 * is interrupted by a signal on UN*X, just go back and try again to
171 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
172 * the signal handler, set a flag to stop capturing; however, without
173 * a guarantee of that sort, we can't guarantee that we'll stop capturing
174 * if the read will be retried and won't time out if no packets arrive.
176 * Therefore, on at least some platforms, we work around the lack of
177 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
178 * to wait for packets to arrive, so that we're probably going to be
179 * blocked in the select() when the signal arrives, and can just bail
180 * out of the loop at that point.
182 * However, we don't want to do that on BSD (because "select()" doesn't work
183 * correctly on BPF devices on at least some releases of some flavors of
184 * BSD), and we don't want to do it on Windows (because "select()" is
185 * something for sockets, not for arbitrary handles). (Note that "Windows"
186 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
187 * using WinPcap, not a UNIX libpcap.)
189 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
190 * on BSD times out even if no packets have arrived, so we'll eventually
191 * exit pcap_dispatch() with an indication that no packets have arrived,
192 * and will break out of the capture loop at that point.
194 * On Windows, we can't send a SIGINT to stop capturing, so none of this
195 * applies in any case.
197 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
198 * want to include it if it's not present on this platform, however.
200 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
201 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
203 # define MUST_DO_SELECT
204 # endif /* avoid select */
205 #endif /* HAVE_PCAP_BREAKLOOP */
207 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
208 * in pcap_dispatch(); on the other hand, select() works just fine there.
209 * Hence we use a select for that come what may.
211 #define MUST_DO_SELECT
214 /** init the capture filter */
217 INITFILTER_BAD_FILTER,
218 INITFILTER_OTHER_ERROR
219 } initfilter_status_t;
221 typedef struct _pcap_options {
225 #ifdef MUST_DO_SELECT
226 int pcap_fd; /* pcap file descriptor */
233 /* capture pipe (unix only "input file") */
234 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
235 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
236 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
238 HANDLE cap_pipe_h; /* The handle of the capture pipe */
240 int cap_pipe_fd; /* the file descriptor of the capture pipe */
242 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
243 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
245 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
246 #endif /* USE_THREADS */
247 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
248 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
250 STATE_EXPECT_REC_HDR,
255 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
257 GMutex *cap_pipe_read_mtx;
258 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
262 typedef struct _loop_data {
264 gboolean go; /* TRUE as long as we're supposed to keep capturing */
265 int err; /* if non-zero, error seen while capturing */
266 gint packet_count; /* Number of packets we have already captured */
267 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
268 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
270 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
277 guint32 autostop_files;
280 typedef struct _pcap_queue_element {
281 pcap_options *pcap_opts;
282 struct pcap_pkthdr phdr;
284 } pcap_queue_element;
287 * Standard secondary message for unexpected errors.
289 static const char please_report[] =
290 "Please report this to the Wireshark developers.\n"
291 "(This is not a crash; please do not report it as such.)";
294 * This needs to be static, so that the SIGINT handler can clear the "go"
297 static loop_data global_ld;
301 * Timeout, in milliseconds, for reads from the stream of captured packets
302 * from a capture device.
304 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
305 * 64-bit applications, with sub-second timeouts not to work. The bug is
306 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
308 #if defined(__APPLE__) && defined(__LP64__)
309 static gboolean need_timeout_workaround;
311 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
313 #define CAP_READ_TIMEOUT 250
317 * Timeout, in microseconds, for reads from the stream of captured packets
318 * from a pipe. Pipes don't have the same problem that BPF devices do
319 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
320 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
321 * of the offending versions of Snow Leopard.
323 * On Windows this value is converted to milliseconds and passed to
324 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
325 * will return immediately.
328 #define PIPE_READ_TIMEOUT 250000
330 #define PIPE_READ_TIMEOUT 100000
333 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
336 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
337 const char *message, gpointer user_data _U_);
339 /* capture related options */
340 static capture_options global_capture_opts;
341 static gboolean quiet = FALSE;
342 static gboolean use_threads = FALSE;
344 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
346 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
348 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
349 int err, gboolean is_close);
351 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
353 static void report_new_capture_file(const char *filename);
354 static void report_packet_count(int packet_count);
355 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
356 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
357 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
359 #define MSG_MAX_LENGTH 4096
362 print_usage(gboolean print_ver)
369 "Dumpcap " VERSION "%s\n"
370 "Capture network packets and dump them into a libpcap file.\n"
371 "See http://www.wireshark.org for more information.\n",
372 wireshark_svnversion);
376 fprintf(output, "\nUsage: dumpcap [options] ...\n");
377 fprintf(output, "\n");
378 fprintf(output, "Capture interface:\n");
379 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
380 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
381 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
382 fprintf(output, " -p don't capture in promiscuous mode\n");
383 #ifdef HAVE_PCAP_CREATE
384 fprintf(output, " -I capture in monitor mode, if available\n");
386 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
387 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
389 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
390 fprintf(output, " -D print list of interfaces and exit\n");
391 fprintf(output, " -L print list of link-layer types of iface and exit\n");
392 #ifdef HAVE_BPF_IMAGE
393 fprintf(output, " -d print generated BPF code for capture filter\n");
395 fprintf(output, " -S print statistics for each interface once every second\n");
396 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
397 fprintf(output, "\n");
398 #ifdef HAVE_PCAP_REMOTE
399 fprintf(output, "\nRPCAP options:\n");
400 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
401 fprintf(output, " -u use UDP for RPCAP data transfer\n");
402 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
403 #ifdef HAVE_PCAP_SETSAMPLING
404 fprintf(output, " -m <sampling type> use packet sampling\n");
405 fprintf(output, " count:NUM - capture one packet of every NUM\n");
406 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
409 fprintf(output, "Stop conditions:\n");
410 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
411 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
412 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
413 fprintf(output, " files:NUM - stop after NUM files\n");
414 /*fprintf(output, "\n");*/
415 fprintf(output, "Output (files):\n");
416 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
417 fprintf(output, " -g enable group read access on the output file(s)\n");
418 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
419 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
420 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
421 fprintf(output, " -n use pcapng format instead of pcap\n");
422 /*fprintf(output, "\n");*/
423 fprintf(output, "Miscellaneous:\n");
424 fprintf(output, " -t use a separate thread per interface\n");
425 fprintf(output, " -q don't report packet capture counts\n");
426 fprintf(output, " -v print version information and exit\n");
427 fprintf(output, " -h display this help and exit\n");
428 fprintf(output, "\n");
429 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
430 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
431 fprintf(output, "\n");
432 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
436 show_version(GString *comp_info_str, GString *runtime_info_str)
439 "Dumpcap " VERSION "%s\n"
444 "See http://www.wireshark.org for more information.\n",
445 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
449 * Print to the standard error. This is a command-line tool, so there's
450 * no need to pop up a console.
453 vfprintf_stderr(const char *fmt, va_list ap)
455 vfprintf(stderr, fmt, ap);
459 fprintf_stderr(const char *fmt, ...)
464 vfprintf_stderr(fmt, ap);
469 * Report an error in command-line arguments.
472 cmdarg_err(const char *fmt, ...)
478 /* Generate a 'special format' message back to parent */
480 msg = g_strdup_vprintf(fmt, ap);
481 sync_pipe_errmsg_to_parent(2, msg, "");
486 fprintf(stderr, "dumpcap: ");
487 vfprintf(stderr, fmt, ap);
488 fprintf(stderr, "\n");
494 * Report additional information for an error in command-line arguments.
497 cmdarg_err_cont(const char *fmt, ...)
504 msg = g_strdup_vprintf(fmt, ap);
505 sync_pipe_errmsg_to_parent(2, msg, "");
510 vfprintf(stderr, fmt, ap);
511 fprintf(stderr, "\n");
518 #if 0 /* Set to enable capability debugging */
519 /* see 'man cap_to_text()' for explanation of output */
520 /* '=' means 'all= ' ie: no capabilities */
521 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
523 print_caps(const char *pfx) {
524 cap_t caps = cap_get_proc();
525 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
526 "%s: EUID: %d Capabilities: %s", pfx,
527 geteuid(), cap_to_text(caps, NULL));
530 print_caps(const char *pfx _U_) {
535 relinquish_all_capabilities(void)
537 /* Drop any and all capabilities this process may have. */
538 /* Allowed whether or not process has any privileges. */
539 cap_t caps = cap_init(); /* all capabilities initialized to off */
540 print_caps("Pre-clear");
541 if (cap_set_proc(caps)) {
542 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
544 print_caps("Post-clear");
550 open_capture_device(interface_options *interface_opts,
551 char (*open_err_str)[PCAP_ERRBUF_SIZE])
554 #ifdef HAVE_PCAP_CREATE
557 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
558 struct pcap_rmtauth auth;
561 /* Open the network interface to capture from it.
562 Some versions of libpcap may put warnings into the error buffer
563 if they succeed; to tell if that's happened, we have to clear
564 the error buffer, and check if it's still a null string. */
565 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Entering open_capture_device().");
566 (*open_err_str)[0] = '\0';
567 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
569 * If we're opening a remote device, use pcap_open(); that's currently
570 * the only open routine that supports remote devices.
572 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
573 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
574 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
575 auth.username = interface_opts->auth_username;
576 auth.password = interface_opts->auth_password;
578 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
579 "Calling pcap_open() using name %s, snaplen %d, promisc_mode %d, datatx_udp %d, nocap_rpcap %d.",
580 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode,
581 interface_opts->datatx_udp, interface_opts->nocap_rpcap);
582 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
584 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
585 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
586 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
587 CAP_READ_TIMEOUT, &auth, *open_err_str);
588 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
589 "pcap_open() returned %p.", (void *)pcap_h);
594 * If we're not opening a remote device, use pcap_create() and
595 * pcap_activate() if we have them, so that we can set the buffer
596 * size, otherwise use pcap_open_live().
598 #ifdef HAVE_PCAP_CREATE
599 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
600 "Calling pcap_create() using %s.", interface_opts->name);
601 pcap_h = pcap_create(interface_opts->name, *open_err_str);
602 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
603 "pcap_create() returned %p.", (void *)pcap_h);
604 if (pcap_h != NULL) {
605 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
606 "Calling pcap_set_snaplen() with snaplen %d.", interface_opts->snaplen);
607 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
608 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
609 "Calling pcap_set_snaplen() with promisc_mode %d.", interface_opts->promisc_mode);
610 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
611 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
613 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
614 "buffersize %d.", interface_opts->buffer_size);
615 if (interface_opts->buffer_size > 1) {
616 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
618 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
619 "monitor_mode %d.", interface_opts->monitor_mode);
620 if (interface_opts->monitor_mode)
621 pcap_set_rfmon(pcap_h, 1);
622 err = pcap_activate(pcap_h);
623 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
624 "pcap_activate() returned %d.", err);
626 /* Failed to activate, set to NULL */
627 if (err == PCAP_ERROR)
628 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
630 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
636 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
637 "pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
638 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode);
639 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
640 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
642 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
643 "pcap_open_live() returned %p.", (void *)pcap_h);
646 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
651 get_capture_device_open_failure_messages(const char *open_err_str,
657 char *errmsg, size_t errmsg_len,
658 char *secondary_errmsg,
659 size_t secondary_errmsg_len)
661 const char *libpcap_warn;
662 static const char ppamsg[] = "can't find PPA for ";
664 /* If we got a "can't find PPA for X" message, warn the user (who
665 is running dumcap on HP-UX) that they don't have a version of
666 libpcap that properly handles HP-UX (libpcap 0.6.x and later
667 versions, which properly handle HP-UX, say "can't find /dev/dlpi
668 PPA for X" rather than "can't find PPA for X"). */
669 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
672 "You are running (T)Wireshark with a version of the libpcap library\n"
673 "that doesn't handle HP-UX network devices well; this means that\n"
674 "(T)Wireshark may not be able to capture packets.\n"
676 "To fix this, you should install libpcap 0.6.2, or a later version\n"
677 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
678 "packaged binary form from the Software Porting And Archive Centre\n"
679 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
680 "at the URL lists a number of mirror sites.";
683 g_snprintf(errmsg, (gulong) errmsg_len,
684 "The capture session could not be initiated (%s).", open_err_str);
686 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
687 "Please check to make sure you have sufficient permissions, and that you have "
688 "the proper interface or pipe specified.%s", libpcap_warn);
690 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
692 "Please check that \"%s\" is the proper interface.\n"
695 "Help can be found at:\n"
697 " http://wiki.wireshark.org/WinPcap\n"
698 " http://wiki.wireshark.org/CaptureSetup\n",
703 /* Set the data link type on a pcap. */
705 set_pcap_linktype(pcap_t *pcap_h, int linktype,
706 #ifdef HAVE_PCAP_SET_DATALINK
711 char *errmsg, size_t errmsg_len,
712 char *secondary_errmsg, size_t secondary_errmsg_len)
714 char *set_linktype_err_str;
717 return TRUE; /* just use the default */
718 #ifdef HAVE_PCAP_SET_DATALINK
719 if (pcap_set_datalink(pcap_h, linktype) == 0)
720 return TRUE; /* no error */
721 set_linktype_err_str = pcap_geterr(pcap_h);
723 /* Let them set it to the type it is; reject any other request. */
724 if (get_pcap_linktype(pcap_h, name) == linktype)
725 return TRUE; /* no error */
726 set_linktype_err_str =
727 "That DLT isn't one of the DLTs supported by this device";
729 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
730 set_linktype_err_str);
732 * If the error isn't "XXX is not one of the DLTs supported by this device",
733 * tell the user to tell the Wireshark developers about it.
735 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
736 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
738 secondary_errmsg[0] = '\0';
743 compile_capture_filter(const char *iface, pcap_t *pcap_h,
744 struct bpf_program *fcode, const char *cfilter)
746 bpf_u_int32 netnum, netmask;
747 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
749 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
751 * Well, we can't get the netmask for this interface; it's used
752 * only for filters that check for broadcast IP addresses, so
753 * we just punt and use 0. It might be nice to warn the user,
754 * but that's a pain in a GUI application, as it'd involve popping
755 * up a message box, and it's not clear how often this would make
756 * a difference (only filters that check for IP broadcast addresses
760 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
765 * Sigh. Older versions of libpcap don't properly declare the
766 * third argument to pcap_compile() as a const pointer. Cast
769 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
774 #ifdef HAVE_BPF_IMAGE
776 show_filter_code(capture_options *capture_opts)
778 interface_options interface_opts;
780 gchar open_err_str[PCAP_ERRBUF_SIZE];
781 char errmsg[MSG_MAX_LENGTH+1];
782 char secondary_errmsg[MSG_MAX_LENGTH+1];
783 struct bpf_program fcode;
784 struct bpf_insn *insn;
788 for (j = 0; j < capture_opts->ifaces->len; j++) {
789 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
790 pcap_h = open_capture_device(&interface_opts, &open_err_str);
791 if (pcap_h == NULL) {
792 /* Open failed; get messages */
793 get_capture_device_open_failure_messages(open_err_str,
795 errmsg, sizeof errmsg,
797 sizeof secondary_errmsg);
798 /* And report them */
799 report_capture_error(errmsg, secondary_errmsg);
803 /* Set the link-layer type. */
804 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
805 errmsg, sizeof errmsg,
806 secondary_errmsg, sizeof secondary_errmsg)) {
808 report_capture_error(errmsg, secondary_errmsg);
812 /* OK, try to compile the capture filter. */
813 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
814 interface_opts.cfilter)) {
816 report_cfilter_error(capture_opts, j, errmsg);
821 /* Now print the filter code. */
822 insn = fcode.bf_insns;
824 for (i = 0; i < fcode.bf_len; insn++, i++)
825 printf("%s\n", bpf_image(insn, i));
827 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
828 /* to remove any suid privileges. */
829 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
830 /* (euid/egid have already previously been set to ruid/rgid. */
831 /* (See comment in main() for details) */
833 relinquish_special_privs_perm();
835 relinquish_all_capabilities();
838 /* Let our parent know we succeeded. */
839 pipe_write_block(2, SP_SUCCESS, NULL);
846 * capture_interface_list() is expected to do the right thing to get
847 * a list of interfaces.
849 * In most of the programs in the Wireshark suite, "the right thing"
850 * is to run dumpcap and ask it for the list, because dumpcap may
851 * be the only program in the suite with enough privileges to get
854 * In dumpcap itself, however, we obviously can't run dumpcap to
855 * ask for the list. Therefore, our capture_interface_list() should
856 * just call get_interface_list().
859 capture_interface_list(int *err, char **err_str)
861 return get_interface_list(err, err_str);
865 * Get the data-link type for a libpcap device.
866 * This works around AIX 5.x's non-standard and incompatible-with-the-
867 * rest-of-the-universe libpcap.
870 get_pcap_linktype(pcap_t *pch, const char *devname
878 const char *ifacename;
881 linktype = pcap_datalink(pch);
885 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
886 * rather than DLT_ values for link-layer types; the ifType values
887 * for LAN devices are:
894 * and the ifType value for a loopback device is 24.
896 * The AIX names for LAN devices begin with:
903 * and the AIX names for loopback devices begin with "lo".
905 * (The difference between "Ethernet" and "802.3" is presumably
906 * whether packets have an Ethernet header, with a packet type,
907 * or an 802.3 header, with a packet length, followed by an 802.2
908 * header and possibly a SNAP header.)
910 * If the device name matches "linktype" interpreted as an ifType
911 * value, rather than as a DLT_ value, we will assume this is AIX's
912 * non-standard, incompatible libpcap, rather than a standard libpcap,
913 * and will map the link-layer type to the standard DLT_ value for
914 * that link-layer type, as that's what the rest of Wireshark expects.
916 * (This means the capture files won't be readable by a tcpdump
917 * linked with AIX's non-standard libpcap, but so it goes. They
918 * *will* be readable by standard versions of tcpdump, Wireshark,
921 * XXX - if we conclude we're using AIX libpcap, should we also
922 * set a flag to cause us to assume the time stamps are in
923 * seconds-and-nanoseconds form, and to convert them to
924 * seconds-and-microseconds form before processing them and
929 * Find the last component of the device name, which is the
932 ifacename = strchr(devname, '/');
933 if (ifacename == NULL)
936 /* See if it matches any of the LAN device names. */
937 if (strncmp(ifacename, "en", 2) == 0) {
940 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
944 } else if (strncmp(ifacename, "et", 2) == 0) {
947 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
948 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
953 } else if (strncmp(ifacename, "tr", 2) == 0) {
956 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
957 * DLT_IEEE802, which is what's used for Token Ring.
961 } else if (strncmp(ifacename, "fi", 2) == 0) {
962 if (linktype == 15) {
964 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
968 } else if (strncmp(ifacename, "lo", 2) == 0) {
969 if (linktype == 24) {
971 * That's the RFC 1573 value for "software loopback" devices; map it
972 * to DLT_NULL, which is what's used for loopback devices on BSD.
982 static data_link_info_t *
983 create_data_link_info(int dlt)
985 data_link_info_t *data_link_info;
988 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
989 data_link_info->dlt = dlt;
990 text = pcap_datalink_val_to_name(dlt);
992 data_link_info->name = g_strdup(text);
994 data_link_info->name = g_strdup_printf("DLT %d", dlt);
995 text = pcap_datalink_val_to_description(dlt);
997 data_link_info->description = g_strdup(text);
999 data_link_info->description = NULL;
1000 return data_link_info;
1004 * Get the capabilities of a network device.
1006 static if_capabilities_t *
1007 get_if_capabilities(const char *devname, gboolean monitor_mode
1008 #ifndef HAVE_PCAP_CREATE
1013 if_capabilities_t *caps;
1014 char errbuf[PCAP_ERRBUF_SIZE];
1016 #ifdef HAVE_PCAP_CREATE
1020 #ifdef HAVE_PCAP_LIST_DATALINKS
1024 data_link_info_t *data_link_info;
1027 * Allocate the interface capabilities structure.
1029 caps = g_malloc(sizeof *caps);
1031 #ifdef HAVE_PCAP_OPEN
1032 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1033 caps->can_set_rfmon = FALSE;
1035 if (err_str != NULL)
1036 *err_str = g_strdup(errbuf);
1040 #elif defined(HAVE_PCAP_CREATE)
1041 pch = pcap_create(devname, errbuf);
1043 if (err_str != NULL)
1044 *err_str = g_strdup(errbuf);
1048 status = pcap_can_set_rfmon(pch);
1051 if (status == PCAP_ERROR)
1052 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1055 *err_str = g_strdup(pcap_statustostr(status));
1061 caps->can_set_rfmon = FALSE;
1062 else if (status == 1) {
1063 caps->can_set_rfmon = TRUE;
1065 pcap_set_rfmon(pch, 1);
1067 if (err_str != NULL) {
1068 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1076 status = pcap_activate(pch);
1078 /* Error. We ignore warnings (status > 0). */
1079 if (err_str != NULL) {
1080 if (status == PCAP_ERROR)
1081 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1084 *err_str = g_strdup(pcap_statustostr(status));
1091 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1092 caps->can_set_rfmon = FALSE;
1094 if (err_str != NULL)
1095 *err_str = g_strdup(errbuf);
1100 deflt = get_pcap_linktype(pch, devname);
1101 #ifdef HAVE_PCAP_LIST_DATALINKS
1102 nlt = pcap_list_datalinks(pch, &linktypes);
1103 if (nlt == 0 || linktypes == NULL) {
1105 if (err_str != NULL)
1106 *err_str = NULL; /* an empty list doesn't mean an error */
1109 caps->data_link_types = NULL;
1110 for (i = 0; i < nlt; i++) {
1111 data_link_info = create_data_link_info(linktypes[i]);
1114 * XXX - for 802.11, make the most detailed 802.11
1115 * version the default, rather than the one the
1116 * device has as the default?
1118 if (linktypes[i] == deflt)
1119 caps->data_link_types = g_list_prepend(caps->data_link_types,
1122 caps->data_link_types = g_list_append(caps->data_link_types,
1125 #ifdef HAVE_PCAP_FREE_DATALINKS
1126 pcap_free_datalinks(linktypes);
1129 * In Windows, there's no guarantee that if you have a library
1130 * built with one version of the MSVC++ run-time library, and
1131 * it returns a pointer to allocated data, you can free that
1132 * data from a program linked with another version of the
1133 * MSVC++ run-time library.
1135 * This is not an issue on UN*X.
1137 * See the mail threads starting at
1139 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1143 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1146 #define xx_free free /* hack so checkAPIs doesn't complain */
1149 #endif /* HAVE_PCAP_FREE_DATALINKS */
1150 #else /* HAVE_PCAP_LIST_DATALINKS */
1152 data_link_info = create_data_link_info(deflt);
1153 caps->data_link_types = g_list_append(caps->data_link_types,
1155 #endif /* HAVE_PCAP_LIST_DATALINKS */
1159 if (err_str != NULL)
1164 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1166 print_machine_readable_interfaces(GList *if_list)
1173 char addr_str[ADDRSTRLEN];
1175 if (capture_child) {
1176 /* Let our parent know we succeeded. */
1177 pipe_write_block(2, SP_SUCCESS, NULL);
1180 i = 1; /* Interface id number */
1181 for (if_entry = g_list_first(if_list); if_entry != NULL;
1182 if_entry = g_list_next(if_entry)) {
1183 if_info = (if_info_t *)if_entry->data;
1184 printf("%d. %s", i++, if_info->name);
1187 * Print the contents of the if_entry struct in a parseable format.
1188 * Each if_entry element is tab-separated. Addresses are comma-
1191 /* XXX - Make sure our description doesn't contain a tab */
1192 if (if_info->description != NULL)
1193 printf("\t%s\t", if_info->description);
1197 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1198 addr = g_slist_next(addr)) {
1199 if (addr != g_slist_nth(if_info->addrs, 0))
1202 if_addr = (if_addr_t *)addr->data;
1203 switch(if_addr->ifat_type) {
1205 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1207 printf("%s", addr_str);
1209 printf("<unknown IPv4>");
1213 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1214 addr_str, ADDRSTRLEN)) {
1215 printf("%s", addr_str);
1217 printf("<unknown IPv6>");
1221 printf("<type unknown %u>", if_addr->ifat_type);
1225 if (if_info->loopback)
1226 printf("\tloopback");
1228 printf("\tnetwork");
1235 * If you change the machine-readable output format of this function,
1236 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1239 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1242 data_link_info_t *data_link_info;
1243 const gchar *desc_str;
1245 if (capture_child) {
1246 /* Let our parent know we succeeded. */
1247 pipe_write_block(2, SP_SUCCESS, NULL);
1250 if (caps->can_set_rfmon)
1254 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1255 lt_entry = g_list_next(lt_entry)) {
1256 data_link_info = (data_link_info_t *)lt_entry->data;
1257 if (data_link_info->description != NULL)
1258 desc_str = data_link_info->description;
1260 desc_str = "(not supported)";
1261 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1271 /* Print the number of packets captured for each interface until we're killed. */
1273 print_statistics_loop(gboolean machine_readable)
1275 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1281 char errbuf[PCAP_ERRBUF_SIZE];
1282 struct pcap_stat ps;
1284 if_list = get_interface_list(&err, &err_str);
1285 if (if_list == NULL) {
1287 case CANT_GET_INTERFACE_LIST:
1288 cmdarg_err("%s", err_str);
1292 case NO_INTERFACES_FOUND:
1293 cmdarg_err("There are no interfaces on which a capture can be done");
1299 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1300 if_info = (if_info_t *)if_entry->data;
1301 #ifdef HAVE_PCAP_OPEN
1302 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1304 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1308 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1309 if_stat->name = g_strdup(if_info->name);
1311 stat_list = g_list_append(stat_list, if_stat);
1316 cmdarg_err("There are no interfaces on which a capture can be done");
1320 if (capture_child) {
1321 /* Let our parent know we succeeded. */
1322 pipe_write_block(2, SP_SUCCESS, NULL);
1325 if (!machine_readable) {
1326 printf("%-15s %10s %10s\n", "Interface", "Received",
1330 global_ld.go = TRUE;
1331 while (global_ld.go) {
1332 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1333 if_stat = (if_stat_t *)stat_entry->data;
1334 pcap_stats(if_stat->pch, &ps);
1336 if (!machine_readable) {
1337 printf("%-15s %10u %10u\n", if_stat->name,
1338 ps.ps_recv, ps.ps_drop);
1340 printf("%s\t%u\t%u\n", if_stat->name,
1341 ps.ps_recv, ps.ps_drop);
1352 /* XXX - Not reached. Should we look for 'q' in stdin? */
1353 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1354 if_stat = (if_stat_t *)stat_entry->data;
1355 pcap_close(if_stat->pch);
1356 g_free(if_stat->name);
1359 g_list_free(stat_list);
1360 free_interface_list(if_list);
1368 capture_cleanup_handler(DWORD dwCtrlType)
1370 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1371 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1372 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1373 like SIGTERM at least when the machine's shutting down.
1375 For now, if we're running as a command rather than a capture child,
1376 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1377 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1378 in that way on UN*X.
1380 If we're not running as a capture child, we might be running as
1381 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1382 user logs out. (XXX - can we explicitly check whether we're
1383 running as a service?) */
1385 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1386 "Console: Control signal");
1387 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1388 "Console: Control signal, CtrlType: %u", dwCtrlType);
1390 /* Keep capture running if we're a service and a user logs off */
1391 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1392 capture_loop_stop();
1400 capture_cleanup_handler(int signum _U_)
1402 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1403 SIGTERM. We assume that if the user wanted it to keep running
1404 after they logged out, they'd have nohupped it. */
1406 /* Note: don't call g_log() in the signal handler: if we happened to be in
1407 * g_log() in process context when the signal came in, g_log will detect
1408 * the "recursion" and abort.
1411 capture_loop_stop();
1417 report_capture_count(gboolean reportit)
1419 /* Don't print this if we're a capture child. */
1420 if (!capture_child && reportit) {
1421 fprintf(stderr, "\rPackets captured: %u\n", global_ld.packet_count);
1422 /* stderr could be line buffered */
1430 report_counts_for_siginfo(void)
1432 report_capture_count(quiet);
1433 infoprint = FALSE; /* we just reported it */
1437 report_counts_siginfo(int signum _U_)
1439 int sav_errno = errno;
1441 /* If we've been told to delay printing, just set a flag asking
1442 that we print counts (if we're supposed to), otherwise print
1443 the count of packets captured (if we're supposed to). */
1447 report_counts_for_siginfo();
1450 #endif /* SIGINFO */
1453 exit_main(int status)
1456 /* Shutdown windows sockets */
1459 /* can be helpful for debugging */
1460 #ifdef DEBUG_DUMPCAP
1461 printf("Press any key\n");
1472 * If we were linked with libcap (not libpcap), make sure we have
1473 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1474 * (See comment in main() for details)
1477 relinquish_privs_except_capture(void)
1479 /* If 'started_with_special_privs' (ie: suid) then enable for
1480 * ourself the NET_ADMIN and NET_RAW capabilities and then
1481 * drop our suid privileges.
1483 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1484 * stuff we don't need (and shouldn't have).
1485 * CAP_NET_RAW: Packet capture (raw sockets).
1488 if (started_with_special_privs()) {
1489 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1490 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1492 cap_t caps = cap_init(); /* all capabilities initialized to off */
1494 print_caps("Pre drop, pre set");
1496 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1497 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1500 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1501 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1503 if (cap_set_proc(caps)) {
1504 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1506 print_caps("Pre drop, post set");
1508 relinquish_special_privs_perm();
1510 print_caps("Post drop, pre set");
1511 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1512 if (cap_set_proc(caps)) {
1513 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1515 print_caps("Post drop, post set");
1521 #endif /* HAVE_LIBCAP */
1523 /* Take care of byte order in the libpcap headers read from pipes.
1524 * (function taken from wiretap/libpcap.c) */
1526 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1529 /* Byte-swap the record header fields. */
1530 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1531 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1532 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1533 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1536 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1537 swapped, in order to match the BPF header layout.
1539 Unfortunately, some files were, according to a comment in the "libpcap"
1540 source, written with version 2.3 in their headers but without the
1541 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1542 would make no sense - we assume that we need to swap them. */
1543 if (hdr->version_major == 2 &&
1544 (hdr->version_minor < 3 ||
1545 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1548 temp = rechdr->orig_len;
1549 rechdr->orig_len = rechdr->incl_len;
1550 rechdr->incl_len = temp;
1556 * Thread function that reads from a pipe and pushes the data
1557 * to the main application thread.
1560 * XXX Right now we use async queues for basic signaling. The main thread
1561 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1562 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1563 * Iff the read is successful cap_pipe_read pushes an item onto
1564 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1565 * the queues themselves (yet).
1567 * We might want to move some of the cap_pipe_dispatch logic here so that
1568 * we can let cap_pipe_read run independently, queuing up multiple reads
1569 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1571 static void *cap_pipe_read(void *arg)
1573 pcap_options *pcap_opts;
1582 pcap_opts = (pcap_options *)arg;
1583 while (pcap_opts->cap_pipe_err == PIPOK) {
1584 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1585 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1587 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1589 /* If we try to use read() on a named pipe on Windows with partial
1590 * data it appears to return EOF.
1592 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1593 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1598 last_err = GetLastError();
1599 if (last_err == ERROR_MORE_DATA) {
1601 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1602 pcap_opts->cap_pipe_err = PIPEOF;
1606 pcap_opts->cap_pipe_err = PIPERR;
1609 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1610 pcap_opts->cap_pipe_err = PIPEOF;
1615 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1616 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1619 pcap_opts->cap_pipe_err = PIPEOF;
1623 pcap_opts->cap_pipe_err = PIPERR;
1632 pcap_opts->cap_pipe_bytes_read = bytes_read;
1633 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1634 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1636 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1640 #endif /* USE_THREADS */
1642 /* Provide select() functionality for a single file descriptor
1643 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1645 * Returns the same values as select.
1648 cap_pipe_select(int pipe_fd)
1651 struct timeval timeout;
1654 FD_SET(pipe_fd, &rfds);
1656 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1657 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1659 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1663 /* Mimic pcap_open_live() for pipe captures
1665 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1666 * open it, and read the header.
1668 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1669 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1671 cap_pipe_open_live(char *pipename,
1672 pcap_options *pcap_opts,
1673 struct pcap_hdr *hdr,
1674 char *errmsg, int errmsgl)
1677 ws_statb64 pipe_stat;
1678 struct sockaddr_un sa;
1689 unsigned int bytes_read;
1694 pcap_opts->cap_pipe_fd = -1;
1696 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1698 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1701 * XXX - this blocks until a pcap per-file header has been written to
1702 * the pipe, so it could block indefinitely.
1704 if (strcmp(pipename, "-") == 0) {
1706 fd = 0; /* read from stdin */
1708 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1712 if (ws_stat64(pipename, &pipe_stat) < 0) {
1713 if (errno == ENOENT || errno == ENOTDIR)
1714 pcap_opts->cap_pipe_err = PIPNEXIST;
1716 g_snprintf(errmsg, errmsgl,
1717 "The capture session could not be initiated "
1718 "due to error getting information on pipe/socket: %s", g_strerror(errno));
1719 pcap_opts->cap_pipe_err = PIPERR;
1723 if (S_ISFIFO(pipe_stat.st_mode)) {
1724 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1726 g_snprintf(errmsg, errmsgl,
1727 "The capture session could not be initiated "
1728 "due to error on pipe open: %s", g_strerror(errno));
1729 pcap_opts->cap_pipe_err = PIPERR;
1732 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1733 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1735 g_snprintf(errmsg, errmsgl,
1736 "The capture session could not be initiated "
1737 "due to error on socket create: %s", g_strerror(errno));
1738 pcap_opts->cap_pipe_err = PIPERR;
1741 sa.sun_family = AF_UNIX;
1743 * The Single UNIX Specification says:
1745 * The size of sun_path has intentionally been left undefined.
1746 * This is because different implementations use different sizes.
1747 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1748 * of 104. Since most implementations originate from BSD versions,
1749 * the size is typically in the range 92 to 108.
1751 * Applications should not assume a particular length for sun_path
1752 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1756 * The <sys/un.h> header shall define the sockaddr_un structure,
1757 * which shall include at least the following members:
1759 * sa_family_t sun_family Address family.
1760 * char sun_path[] Socket pathname.
1762 * so we assume that it's an array, with a specified size,
1763 * and that the size reflects the maximum path length.
1765 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1766 /* Path name too long */
1767 g_snprintf(errmsg, errmsgl,
1768 "The capture session coud not be initiated "
1769 "due to error on socket connect: Path name too long");
1770 pcap_opts->cap_pipe_err = PIPERR;
1773 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1775 g_snprintf(errmsg, errmsgl,
1776 "The capture session coud not be initiated "
1777 "due to error on socket connect: %s", g_strerror(errno));
1778 pcap_opts->cap_pipe_err = PIPERR;
1782 if (S_ISCHR(pipe_stat.st_mode)) {
1784 * Assume the user specified an interface on a system where
1785 * interfaces are in /dev. Pretend we haven't seen it.
1787 pcap_opts->cap_pipe_err = PIPNEXIST;
1790 g_snprintf(errmsg, errmsgl,
1791 "The capture session could not be initiated because\n"
1792 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1793 pcap_opts->cap_pipe_err = PIPERR;
1798 #define PIPE_STR "\\pipe\\"
1799 /* Under Windows, named pipes _must_ have the form
1800 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1802 pncopy = g_strdup(pipename);
1803 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1804 pos = strchr(pncopy + 3, '\\');
1805 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1812 g_snprintf(errmsg, errmsgl,
1813 "The capture session could not be initiated because\n"
1814 "\"%s\" is neither an interface nor a pipe", pipename);
1815 pcap_opts->cap_pipe_err = PIPNEXIST;
1819 /* Wait for the pipe to appear */
1821 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1822 OPEN_EXISTING, 0, NULL);
1824 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1827 if (GetLastError() != ERROR_PIPE_BUSY) {
1828 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1829 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1830 g_snprintf(errmsg, errmsgl,
1831 "The capture session on \"%s\" could not be started "
1832 "due to error on pipe open: %s (error %d)",
1833 pipename, utf_16to8(err_str), GetLastError());
1835 pcap_opts->cap_pipe_err = PIPERR;
1839 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1840 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1841 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1842 g_snprintf(errmsg, errmsgl,
1843 "The capture session on \"%s\" timed out during "
1844 "pipe open: %s (error %d)",
1845 pipename, utf_16to8(err_str), GetLastError());
1847 pcap_opts->cap_pipe_err = PIPERR;
1854 pcap_opts->from_cap_pipe = TRUE;
1857 /* read the pcap header */
1859 while (bytes_read < sizeof magic) {
1860 sel_ret = cap_pipe_select(fd);
1862 g_snprintf(errmsg, errmsgl,
1863 "Unexpected error from select: %s", g_strerror(errno));
1865 } else if (sel_ret > 0) {
1866 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1869 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1871 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1878 #else /* USE_THREADS */
1879 g_thread_create(&cap_pipe_read, pcap_opts, FALSE, NULL);
1881 pcap_opts->cap_pipe_buf = (char *) &magic;
1882 pcap_opts->cap_pipe_bytes_read = 0;
1883 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1884 /* We don't have to worry about cap_pipe_read_mtx here */
1885 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1886 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1887 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1888 if (pcap_opts->cap_pipe_bytes_read == 0)
1889 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1891 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1896 #endif /* USE_THREADS */
1900 /* Host that wrote it has our byte order, and was running
1901 a program using either standard or ss990417 libpcap. */
1902 pcap_opts->cap_pipe_byte_swapped = FALSE;
1903 pcap_opts->cap_pipe_modified = FALSE;
1905 case PCAP_MODIFIED_MAGIC:
1906 /* Host that wrote it has our byte order, but was running
1907 a program using either ss990915 or ss991029 libpcap. */
1908 pcap_opts->cap_pipe_byte_swapped = FALSE;
1909 pcap_opts->cap_pipe_modified = TRUE;
1911 case PCAP_SWAPPED_MAGIC:
1912 /* Host that wrote it has a byte order opposite to ours,
1913 and was running a program using either standard or
1914 ss990417 libpcap. */
1915 pcap_opts->cap_pipe_byte_swapped = TRUE;
1916 pcap_opts->cap_pipe_modified = FALSE;
1918 case PCAP_SWAPPED_MODIFIED_MAGIC:
1919 /* Host that wrote it out has a byte order opposite to
1920 ours, and was running a program using either ss990915
1921 or ss991029 libpcap. */
1922 pcap_opts->cap_pipe_byte_swapped = TRUE;
1923 pcap_opts->cap_pipe_modified = TRUE;
1926 /* Not a "libpcap" type we know about. */
1927 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1932 /* Read the rest of the header */
1934 while (bytes_read < sizeof(struct pcap_hdr)) {
1935 sel_ret = cap_pipe_select(fd);
1937 g_snprintf(errmsg, errmsgl,
1938 "Unexpected error from select: %s", g_strerror(errno));
1940 } else if (sel_ret > 0) {
1941 b = read(fd, ((char *)hdr)+bytes_read,
1942 sizeof(struct pcap_hdr) - bytes_read);
1945 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1947 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1954 #else /* USE_THREADS */
1955 pcap_opts->cap_pipe_buf = (char *) hdr;
1956 pcap_opts->cap_pipe_bytes_read = 0;
1957 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1958 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1959 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1960 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1961 if (pcap_opts->cap_pipe_bytes_read == 0)
1962 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1964 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1968 #endif /* USE_THREADS */
1970 if (pcap_opts->cap_pipe_byte_swapped) {
1971 /* Byte-swap the header fields about which we care. */
1972 hdr->version_major = BSWAP16(hdr->version_major);
1973 hdr->version_minor = BSWAP16(hdr->version_minor);
1974 hdr->snaplen = BSWAP32(hdr->snaplen);
1975 hdr->network = BSWAP32(hdr->network);
1977 pcap_opts->linktype = hdr->network;
1979 if (hdr->version_major < 2) {
1980 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1984 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1985 pcap_opts->cap_pipe_err = PIPOK;
1987 pcap_opts->cap_pipe_fd = fd;
1992 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1993 pcap_opts->cap_pipe_err = PIPERR;
1996 pcap_opts->cap_pipe_fd = -1;
2003 /* We read one record from the pipe, take care of byte order in the record
2004 * header, write the record to the capture file, and update capture statistics. */
2006 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
2008 struct pcap_pkthdr phdr;
2009 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2021 #ifdef LOG_CAPTURE_VERBOSE
2022 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2025 switch (pcap_opts->cap_pipe_state) {
2027 case STATE_EXPECT_REC_HDR:
2029 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2032 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2033 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2034 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2035 pcap_opts->cap_pipe_bytes_read = 0;
2038 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2039 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2040 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2045 case STATE_READ_REC_HDR:
2047 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2048 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2051 result = PD_PIPE_EOF;
2053 result = PD_PIPE_ERR;
2056 pcap_opts->cap_pipe_bytes_read += b;
2057 #else /* USE_THREADS */
2058 g_get_current_time(&wait_time);
2059 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2060 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2061 if (pcap_opts->cap_pipe_err == PIPEOF) {
2062 result = PD_PIPE_EOF;
2064 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2065 result = PD_PIPE_ERR;
2071 #endif /* USE_THREADS */
2072 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2074 result = PD_REC_HDR_READ;
2077 case STATE_EXPECT_DATA:
2079 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2082 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2083 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2084 pcap_opts->cap_pipe_bytes_read = 0;
2087 pcap_opts->cap_pipe_buf = (char *) data;
2088 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2089 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2094 case STATE_READ_DATA:
2096 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2097 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2100 result = PD_PIPE_EOF;
2102 result = PD_PIPE_ERR;
2105 pcap_opts->cap_pipe_bytes_read += b;
2106 #else /* USE_THREADS */
2107 g_get_current_time(&wait_time);
2108 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2109 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2110 if (pcap_opts->cap_pipe_err == PIPEOF) {
2111 result = PD_PIPE_EOF;
2113 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2114 result = PD_PIPE_ERR;
2120 #endif /* USE_THREADS */
2121 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2123 result = PD_DATA_READ;
2127 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2130 } /* switch (ld->cap_pipe_state) */
2133 * We've now read as much data as we were expecting, so process it.
2137 case PD_REC_HDR_READ:
2138 /* We've read the header. Take care of byte order. */
2139 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2140 &pcap_opts->cap_pipe_rechdr.hdr);
2141 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2142 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2143 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2147 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2148 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2151 /* no data to read? fall through */
2154 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2155 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2156 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2157 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2158 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2161 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2163 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2165 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2169 pcap_opts->cap_pipe_err = PIPEOF;
2174 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2175 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2176 g_snprintf(errmsg, errmsgl,
2177 "Error reading from pipe: %s (error %d)",
2178 utf_16to8(err_str), GetLastError());
2181 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2189 pcap_opts->cap_pipe_err = PIPERR;
2190 /* Return here rather than inside the switch to prevent GCC warning */
2195 /** Open the capture input file (pcap or capture pipe).
2196 * Returns TRUE if it succeeds, FALSE otherwise. */
2198 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2199 char *errmsg, size_t errmsg_len,
2200 char *secondary_errmsg, size_t secondary_errmsg_len)
2202 gchar open_err_str[PCAP_ERRBUF_SIZE];
2203 gchar *sync_msg_str;
2204 interface_options interface_opts;
2205 pcap_options *pcap_opts;
2209 gchar *sync_secondary_msg_str;
2210 WORD wVersionRequested;
2214 /* XXX - opening Winsock on tshark? */
2216 /* Initialize Windows Socket if we are in a WIN32 OS
2217 This needs to be done before querying the interface for network/netmask */
2219 /* XXX - do we really require 1.1 or earlier?
2220 Are there any versions that support only 2.0 or higher? */
2221 wVersionRequested = MAKEWORD(1, 1);
2222 err = WSAStartup(wVersionRequested, &wsaData);
2226 case WSASYSNOTREADY:
2227 g_snprintf(errmsg, (gulong) errmsg_len,
2228 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2231 case WSAVERNOTSUPPORTED:
2232 g_snprintf(errmsg, (gulong) errmsg_len,
2233 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2234 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2237 case WSAEINPROGRESS:
2238 g_snprintf(errmsg, (gulong) errmsg_len,
2239 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2243 g_snprintf(errmsg, (gulong) errmsg_len,
2244 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2248 g_snprintf(errmsg, (gulong) errmsg_len,
2249 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2253 g_snprintf(errmsg, (gulong) errmsg_len,
2254 "Couldn't initialize Windows Sockets: error %d", err);
2257 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2261 if ((use_threads == FALSE) &&
2262 (capture_opts->ifaces->len > 1)) {
2263 g_snprintf(errmsg, (gulong) errmsg_len,
2264 "Using threads is required for capturing on mulitple interfaces! Use the -t option.");
2268 for (i = 0; i < capture_opts->ifaces->len; i++) {
2269 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2270 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2271 if (pcap_opts == NULL) {
2272 g_snprintf(errmsg, (gulong) errmsg_len,
2273 "Could not allocate memory.");
2276 pcap_opts->received = 0;
2277 pcap_opts->dropped = 0;
2278 pcap_opts->pcap_h = NULL;
2279 #ifdef MUST_DO_SELECT
2280 pcap_opts->pcap_fd = -1;
2282 pcap_opts->pcap_err = FALSE;
2283 pcap_opts->interface_id = i;
2284 pcap_opts->tid = NULL;
2285 pcap_opts->snaplen = 0;
2286 pcap_opts->linktype = -1;
2287 pcap_opts->from_cap_pipe = FALSE;
2288 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2289 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2291 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2293 pcap_opts->cap_pipe_fd = -1;
2295 pcap_opts->cap_pipe_modified = FALSE;
2296 pcap_opts->cap_pipe_byte_swapped = FALSE;
2298 pcap_opts->cap_pipe_buf = NULL;
2299 #endif /* USE_THREADS */
2300 pcap_opts->cap_pipe_bytes_to_read = 0;
2301 pcap_opts->cap_pipe_bytes_read = 0;
2302 pcap_opts->cap_pipe_state = 0;
2303 pcap_opts->cap_pipe_err = PIPOK;
2305 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2306 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2307 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2309 g_array_append_val(ld->pcaps, pcap_opts);
2311 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2312 pcap_opts->pcap_h = open_capture_device(&interface_opts, &open_err_str);
2314 if (pcap_opts->pcap_h != NULL) {
2315 /* we've opened "iface" as a network device */
2317 /* try to set the capture buffer size */
2318 if (interface_opts.buffer_size > 1 &&
2319 pcap_setbuff(pcap_opts->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2320 sync_secondary_msg_str = g_strdup_printf(
2321 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2322 "the default of 1MB will be used.\n"
2324 "Nonetheless, the capture is started.\n",
2325 interface_opts.buffer_size);
2326 report_capture_error("Couldn't set the capture buffer size!",
2327 sync_secondary_msg_str);
2328 g_free(sync_secondary_msg_str);
2332 #if defined(HAVE_PCAP_SETSAMPLING)
2333 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2334 struct pcap_samp *samp;
2336 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2337 switch (interface_opts.sampling_method) {
2338 case CAPTURE_SAMP_BY_COUNT:
2339 samp->method = PCAP_SAMP_1_EVERY_N;
2342 case CAPTURE_SAMP_BY_TIMER:
2343 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2347 sync_msg_str = g_strdup_printf(
2348 "Unknown sampling method %d specified,\n"
2349 "continue without packet sampling",
2350 interface_opts.sampling_method);
2351 report_capture_error("Couldn't set the capture "
2352 "sampling", sync_msg_str);
2353 g_free(sync_msg_str);
2355 samp->value = interface_opts.sampling_param;
2357 report_capture_error("Couldn't set the capture sampling",
2358 "Cannot get packet sampling data structure");
2363 /* setting the data link type only works on real interfaces */
2364 if (!set_pcap_linktype(pcap_opts->pcap_h, interface_opts.linktype, interface_opts.name,
2366 secondary_errmsg, secondary_errmsg_len)) {
2369 pcap_opts->linktype = get_pcap_linktype(pcap_opts->pcap_h, interface_opts.name);
2371 /* We couldn't open "iface" as a network device. */
2372 /* Try to open it as a pipe */
2373 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2376 if (pcap_opts->cap_pipe_fd == -1) {
2378 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2380 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2381 /* Pipe doesn't exist, so output message for interface */
2382 get_capture_device_open_failure_messages(open_err_str,
2383 interface_opts.name,
2387 secondary_errmsg_len);
2390 * Else pipe (or file) does exist and cap_pipe_open_live() has
2395 /* cap_pipe_open_live() succeeded; don't want
2396 error message from pcap_open_live() */
2397 open_err_str[0] = '\0';
2401 /* XXX - will this work for tshark? */
2402 #ifdef MUST_DO_SELECT
2403 if (!pcap_opts->from_cap_pipe) {
2404 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2405 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2407 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2412 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2413 returned a warning; print it, but keep capturing. */
2414 if (open_err_str[0] != '\0') {
2415 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2416 report_capture_error(sync_msg_str, "");
2417 g_free(sync_msg_str);
2419 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2420 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2423 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2424 /* to remove any suid privileges. */
2425 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2426 /* (euid/egid have already previously been set to ruid/rgid. */
2427 /* (See comment in main() for details) */
2429 relinquish_special_privs_perm();
2431 relinquish_all_capabilities();
2436 /* close the capture input file (pcap or capture pipe) */
2437 static void capture_loop_close_input(loop_data *ld)
2440 pcap_options *pcap_opts;
2442 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2444 for (i = 0; i < ld->pcaps->len; i++) {
2445 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2446 /* if open, close the capture pipe "input file" */
2448 if (pcap_opts->cap_pipe_fd >= 0) {
2449 g_assert(pcap_opts->from_cap_pipe);
2450 ws_close(pcap_opts->cap_pipe_fd);
2451 pcap_opts->cap_pipe_fd = -1;
2454 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2455 CloseHandle(pcap_opts->cap_pipe_h);
2456 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2459 /* if open, close the pcap "input file" */
2460 if (pcap_opts->pcap_h != NULL) {
2461 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2462 pcap_close(pcap_opts->pcap_h);
2463 pcap_opts->pcap_h = NULL;
2470 /* Shut down windows sockets */
2476 /* init the capture filter */
2477 static initfilter_status_t
2478 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2479 const gchar * name, const gchar * cfilter)
2481 struct bpf_program fcode;
2483 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2485 /* capture filters only work on real interfaces */
2486 if (cfilter && !from_cap_pipe) {
2487 /* A capture filter was specified; set it up. */
2488 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2489 /* Treat this specially - our caller might try to compile this
2490 as a display filter and, if that succeeds, warn the user that
2491 the display and capture filter syntaxes are different. */
2492 return INITFILTER_BAD_FILTER;
2494 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2495 #ifdef HAVE_PCAP_FREECODE
2496 pcap_freecode(&fcode);
2498 return INITFILTER_OTHER_ERROR;
2500 #ifdef HAVE_PCAP_FREECODE
2501 pcap_freecode(&fcode);
2505 return INITFILTER_NO_ERROR;
2509 /* set up to write to the already-opened capture output file/files */
2511 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2515 pcap_options *pcap_opts;
2516 interface_options interface_opts;
2517 gboolean successful;
2519 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2521 if ((capture_opts->use_pcapng == FALSE) &&
2522 (capture_opts->ifaces->len > 1)) {
2523 g_snprintf(errmsg, errmsg_len,
2524 "Using PCAPNG is required for capturing on mulitple interfaces! Use the -n option.");
2528 /* Set up to write to the capture file. */
2529 if (capture_opts->multi_files_on) {
2530 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2532 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2535 if (capture_opts->use_pcapng) {
2538 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2539 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err);
2540 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2541 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2542 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2543 if (pcap_opts->from_cap_pipe) {
2544 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2546 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2548 successful = libpcap_write_interface_description_block(ld->pdh,
2549 interface_opts.name,
2550 interface_opts.cfilter?interface_opts.cfilter:"",
2551 pcap_opts->linktype,
2557 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2558 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2559 if (pcap_opts->from_cap_pipe) {
2560 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2562 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2564 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2565 &ld->bytes_written, &err);
2573 if (ld->pdh == NULL) {
2574 /* We couldn't set up to write to the capture file. */
2575 /* XXX - use cf_open_error_message from tshark instead? */
2580 g_snprintf(errmsg, errmsg_len,
2581 "The file to which the capture would be"
2582 " saved (\"%s\") could not be opened: Error %d.",
2583 capture_opts->save_file, err);
2585 g_snprintf(errmsg, errmsg_len,
2586 "The file to which the capture would be"
2587 " saved (\"%s\") could not be opened: %s.",
2588 capture_opts->save_file, g_strerror(err));
2600 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2604 pcap_options *pcap_opts;
2606 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2608 if (capture_opts->multi_files_on) {
2609 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2611 if (capture_opts->use_pcapng) {
2612 for (i = 0; i < global_ld.pcaps->len; i++) {
2613 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2614 if (!pcap_opts->from_cap_pipe) {
2615 libpcap_write_interface_statistics_block(ld->pdh, i, pcap_opts->pcap_h, &ld->bytes_written, err_close);
2619 return libpcap_dump_close(ld->pdh, err_close);
2623 /* dispatch incoming packets (pcap or capture pipe)
2625 * Waits for incoming packets to be available, and calls pcap_dispatch()
2626 * to cause them to be processed.
2628 * Returns the number of packets which were processed.
2630 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2631 * packet-batching behaviour does not cause packets to get held back
2635 capture_loop_dispatch(loop_data *ld,
2636 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2639 gint packet_count_before;
2640 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2645 packet_count_before = ld->packet_count;
2646 if (pcap_opts->from_cap_pipe) {
2647 /* dispatch from capture pipe */
2648 #ifdef LOG_CAPTURE_VERBOSE
2649 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2652 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2654 if (sel_ret < 0 && errno != EINTR) {
2655 g_snprintf(errmsg, errmsg_len,
2656 "Unexpected error from select: %s", g_strerror(errno));
2657 report_capture_error(errmsg, please_report);
2662 * "select()" says we can read from the pipe without blocking
2664 #endif /* USE_THREADS */
2665 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2675 /* dispatch from pcap */
2676 #ifdef MUST_DO_SELECT
2678 * If we have "pcap_get_selectable_fd()", we use it to get the
2679 * descriptor on which to select; if that's -1, it means there
2680 * is no descriptor on which you can do a "select()" (perhaps
2681 * because you're capturing on a special device, and that device's
2682 * driver unfortunately doesn't support "select()", in which case
2683 * we don't do the select - which means it might not be possible
2684 * to stop a capture until a packet arrives. If that's unacceptable,
2685 * plead with whoever supplies the software for that device to add
2686 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2687 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2688 * later, so it can use pcap_breakloop().
2690 #ifdef LOG_CAPTURE_VERBOSE
2691 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2693 if (pcap_opts->pcap_fd != -1) {
2694 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2697 * "select()" says we can read from it without blocking; go for
2700 * We don't have pcap_breakloop(), so we only process one packet
2701 * per pcap_dispatch() call, to allow a signal to stop the
2702 * processing immediately, rather than processing all packets
2703 * in a batch before quitting.
2706 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2708 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2712 /* Error, rather than pcap_breakloop(). */
2713 pcap_opts->pcap_err = TRUE;
2715 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2718 if (sel_ret < 0 && errno != EINTR) {
2719 g_snprintf(errmsg, errmsg_len,
2720 "Unexpected error from select: %s", g_strerror(errno));
2721 report_capture_error(errmsg, please_report);
2727 #endif /* MUST_DO_SELECT */
2729 /* dispatch from pcap without select */
2731 #ifdef LOG_CAPTURE_VERBOSE
2732 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2736 * On Windows, we don't support asynchronously telling a process to
2737 * stop capturing; instead, we check for an indication on a pipe
2738 * after processing packets. We therefore process only one packet
2739 * at a time, so that we can check the pipe after every packet.
2742 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2744 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2748 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2750 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2755 /* Error, rather than pcap_breakloop(). */
2756 pcap_opts->pcap_err = TRUE;
2758 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2760 #else /* pcap_next_ex */
2761 #ifdef LOG_CAPTURE_VERBOSE
2762 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2764 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2767 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2768 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2769 * This should be fixed in the WinPcap 4.0 alpha release.
2771 * For reference, an example remote interface:
2772 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2775 /* emulate dispatch from pcap */
2778 struct pcap_pkthdr *pkt_header;
2783 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2785 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2787 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2792 pcap_opts->pcap_err = TRUE;
2796 #endif /* pcap_next_ex */
2800 #ifdef LOG_CAPTURE_VERBOSE
2801 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2804 return ld->packet_count - packet_count_before;
2808 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2809 * want to grab only the characters between the '{' and '}' delimiters.
2811 * Returns a GString that must be freed with g_string_free(). */
2813 isolate_uuid(const char *iface)
2818 ptr = strchr(iface, '{');
2820 return g_string_new(iface);
2821 gstr = g_string_new(ptr + 1);
2823 ptr = strchr(gstr->str, '}');
2827 gstr = g_string_truncate(gstr, ptr - gstr->str);
2832 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2833 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2835 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2836 char *errmsg, int errmsg_len)
2839 gchar *capfile_name;
2841 gboolean is_tempfile;
2843 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2844 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2846 if (capture_opts->save_file != NULL) {
2847 /* We return to the caller while the capture is in progress.
2848 * Therefore we need to take a copy of save_file in
2849 * case the caller destroys it after we return.
2851 capfile_name = g_strdup(capture_opts->save_file);
2853 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2854 if (capture_opts->multi_files_on) {
2855 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2856 g_snprintf(errmsg, errmsg_len,
2857 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2858 g_free(capfile_name);
2861 if (strcmp(capfile_name, "-") == 0) {
2862 /* write to stdout */
2865 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2866 _setmode(1, O_BINARY);
2869 } /* if (...output_to_pipe ... */
2872 if (capture_opts->multi_files_on) {
2873 /* ringbuffer is enabled */
2874 *save_file_fd = ringbuf_init(capfile_name,
2875 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2876 capture_opts->group_read_access);
2878 /* we need the ringbuf name */
2879 if(*save_file_fd != -1) {
2880 g_free(capfile_name);
2881 capfile_name = g_strdup(ringbuf_current_filename());
2884 /* Try to open/create the specified file for use as a capture buffer. */
2885 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2886 (capture_opts->group_read_access) ? 0640 : 0600);
2889 is_tempfile = FALSE;
2891 /* Choose a random name for the temporary capture buffer */
2892 if (global_capture_opts.ifaces->len > 1) {
2893 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
2898 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
2899 prefix = g_strconcat("wireshark_", g_basename(iface->str), NULL);
2900 g_string_free(iface, TRUE);
2902 prefix = g_strconcat("wireshark_", g_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).name), NULL);
2905 *save_file_fd = create_tempfile(&tmpname, prefix);
2907 capfile_name = g_strdup(tmpname);
2911 /* did we fail to open the output file? */
2912 if (*save_file_fd == -1) {
2914 g_snprintf(errmsg, errmsg_len,
2915 "The temporary file to which the capture would be saved (\"%s\") "
2916 "could not be opened: %s.", capfile_name, g_strerror(errno));
2918 if (capture_opts->multi_files_on) {
2919 ringbuf_error_cleanup();
2922 g_snprintf(errmsg, errmsg_len,
2923 "The file to which the capture would be saved (\"%s\") "
2924 "could not be opened: %s.", capfile_name,
2927 g_free(capfile_name);
2931 if(capture_opts->save_file != NULL) {
2932 g_free(capture_opts->save_file);
2934 capture_opts->save_file = capfile_name;
2935 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2936 "g_free(capfile_name)". */
2942 /* Do the work of handling either the file size or file duration capture
2943 conditions being reached, and switching files or stopping. */
2945 do_file_switch_or_stop(capture_options *capture_opts,
2946 condition *cnd_autostop_files,
2947 condition *cnd_autostop_size,
2948 condition *cnd_file_duration)
2951 pcap_options *pcap_opts;
2952 interface_options interface_opts;
2953 gboolean successful;
2955 if (capture_opts->multi_files_on) {
2956 if (cnd_autostop_files != NULL &&
2957 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2958 /* no files left: stop here */
2959 global_ld.go = FALSE;
2963 /* Switch to the next ringbuffer file */
2964 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2965 &global_ld.save_file_fd, &global_ld.err)) {
2967 /* File switch succeeded: reset the conditions */
2968 global_ld.bytes_written = 0;
2969 if (capture_opts->use_pcapng) {
2972 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2973 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &(global_ld.bytes_written), &global_ld.err);
2974 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2975 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2976 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2977 successful = libpcap_write_interface_description_block(global_ld.pdh,
2978 interface_opts.name,
2979 interface_opts.cfilter?interface_opts.cfilter:"",
2980 pcap_opts->linktype,
2982 &(global_ld.bytes_written),
2986 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2987 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
2988 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
2989 &global_ld.bytes_written, &global_ld.err);
2992 fclose(global_ld.pdh);
2993 global_ld.pdh = NULL;
2994 global_ld.go = FALSE;
2997 if (cnd_autostop_size)
2998 cnd_reset(cnd_autostop_size);
2999 if (cnd_file_duration)
3000 cnd_reset(cnd_file_duration);
3001 libpcap_dump_flush(global_ld.pdh, NULL);
3003 report_packet_count(global_ld.inpkts_to_sync_pipe);
3004 global_ld.inpkts_to_sync_pipe = 0;
3005 report_new_capture_file(capture_opts->save_file);
3007 /* File switch failed: stop here */
3008 global_ld.go = FALSE;
3012 /* single file, stop now */
3013 global_ld.go = FALSE;
3020 pcap_read_handler(void* arg)
3022 pcap_options *pcap_opts;
3023 char errmsg[MSG_MAX_LENGTH+1];
3025 pcap_opts = (pcap_options *)arg;
3027 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
3028 pcap_opts->interface_id);
3030 while (global_ld.go) {
3031 /* dispatch incoming packets */
3032 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
3034 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
3035 pcap_opts->interface_id);
3036 g_thread_exit(NULL);
3040 /* Do the low-level work of a capture.
3041 Returns TRUE if it succeeds, FALSE otherwise. */
3043 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3046 time_t upd_time, cur_time;
3048 struct timeval upd_time, cur_time;
3052 condition *cnd_file_duration = NULL;
3053 condition *cnd_autostop_files = NULL;
3054 condition *cnd_autostop_size = NULL;
3055 condition *cnd_autostop_duration = NULL;
3058 gboolean cfilter_error = FALSE;
3059 char errmsg[MSG_MAX_LENGTH+1];
3060 char secondary_errmsg[MSG_MAX_LENGTH+1];
3061 pcap_options *pcap_opts;
3062 interface_options interface_opts;
3063 guint i, error_index = 0;
3065 interface_opts = capture_opts->default_options;
3067 *secondary_errmsg = '\0';
3069 /* init the loop data */
3070 global_ld.go = TRUE;
3071 global_ld.packet_count = 0;
3073 global_ld.report_packet_count = FALSE;
3075 if (capture_opts->has_autostop_packets)
3076 global_ld.packet_max = capture_opts->autostop_packets;
3078 global_ld.packet_max = 0; /* no limit */
3079 global_ld.inpkts_to_sync_pipe = 0;
3080 global_ld.err = 0; /* no error seen yet */
3081 global_ld.pdh = NULL;
3082 global_ld.autostop_files = 0;
3083 global_ld.save_file_fd = -1;
3085 /* We haven't yet gotten the capture statistics. */
3086 *stats_known = FALSE;
3088 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3089 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3091 /* open the "input file" from network interface or capture pipe */
3092 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3093 secondary_errmsg, sizeof(secondary_errmsg))) {
3096 for (i = 0; i < capture_opts->ifaces->len; i++) {
3097 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3098 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3099 /* init the input filter from the network interface (capture pipe will do nothing) */
3101 * When remote capturing WinPCap crashes when the capture filter
3102 * is NULL. This might be a bug in WPCap. Therefore we provide an emtpy
3105 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3106 interface_opts.name,
3107 interface_opts.cfilter?interface_opts.cfilter:"")) {
3109 case INITFILTER_NO_ERROR:
3112 case INITFILTER_BAD_FILTER:
3113 cfilter_error = TRUE;
3115 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3118 case INITFILTER_OTHER_ERROR:
3119 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3120 pcap_geterr(pcap_opts->pcap_h));
3121 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3126 /* If we're supposed to write to a capture file, open it for output
3127 (temporary/specified name/ringbuffer) */
3128 if (capture_opts->saving_to_file) {
3129 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3130 errmsg, sizeof(errmsg))) {
3134 /* set up to write to the already-opened capture output file/files */
3135 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3140 /* XXX - capture SIGTERM and close the capture, in case we're on a
3141 Linux 2.0[.x] system and you have to explicitly close the capture
3142 stream in order to turn promiscuous mode off? We need to do that
3143 in other places as well - and I don't think that works all the
3144 time in any case, due to libpcap bugs. */
3146 /* Well, we should be able to start capturing.
3148 Sync out the capture file, so the header makes it to the file system,
3149 and send a "capture started successfully and capture file created"
3150 message to our parent so that they'll open the capture file and
3151 update its windows to indicate that we have a live capture in
3153 libpcap_dump_flush(global_ld.pdh, NULL);
3154 report_new_capture_file(capture_opts->save_file);
3157 /* initialize capture stop (and alike) conditions */
3158 init_capture_stop_conditions();
3159 /* create stop conditions */
3160 if (capture_opts->has_autostop_filesize)
3162 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3163 if (capture_opts->has_autostop_duration)
3164 cnd_autostop_duration =
3165 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3167 if (capture_opts->multi_files_on) {
3168 if (capture_opts->has_file_duration)
3170 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3172 if (capture_opts->has_autostop_files)
3173 cnd_autostop_files =
3174 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3177 /* init the time values */
3179 upd_time = GetTickCount();
3181 gettimeofday(&upd_time, NULL);
3184 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3186 /* WOW, everything is prepared! */
3187 /* please fasten your seat belts, we will enter now the actual capture loop */
3189 pcap_queue = g_async_queue_new();
3190 pcap_queue_bytes = 0;
3191 pcap_queue_packets = 0;
3192 for (i = 0; i < global_ld.pcaps->len; i++) {
3193 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3194 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3197 while (global_ld.go) {
3198 /* dispatch incoming packets */
3200 GTimeVal write_thread_time;
3201 pcap_queue_element *queue_element;
3203 g_get_current_time(&write_thread_time);
3204 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3205 g_async_queue_lock(pcap_queue);
3206 queue_element = g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3207 if (queue_element) {
3208 pcap_queue_bytes -= queue_element->phdr.caplen;
3209 pcap_queue_packets -= 1;
3211 g_async_queue_unlock(pcap_queue);
3212 if (queue_element) {
3213 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3214 "Dequeued a packet of length %d captured on interface %d.",
3215 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3217 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3218 &queue_element->phdr,
3220 g_free(queue_element->pd);
3221 g_free(queue_element);
3227 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3228 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3229 sizeof(errmsg), pcap_opts);
3232 /* Were we asked to print packet counts by the SIGINFO handler? */
3233 if (global_ld.report_packet_count) {
3234 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3235 plurality(global_ld.packet_count, "", "s"));
3236 global_ld.report_packet_count = FALSE;
3241 /* any news from our parent (signal pipe)? -> just stop the capture */
3242 if (!signal_pipe_check_running()) {
3243 global_ld.go = FALSE;
3248 global_ld.inpkts_to_sync_pipe += inpkts;
3250 /* check capture size condition */
3251 if (cnd_autostop_size != NULL &&
3252 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3253 /* Capture size limit reached, do we have another file? */
3254 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3255 cnd_autostop_size, cnd_file_duration))
3257 } /* cnd_autostop_size */
3258 if (capture_opts->output_to_pipe) {
3259 libpcap_dump_flush(global_ld.pdh, NULL);
3263 /* Only update once every 500ms so as not to overload slow displays.
3264 * This also prevents too much context-switching between the dumpcap
3265 * and wireshark processes.
3267 #define DUMPCAP_UPD_TIME 500
3270 cur_time = GetTickCount();
3271 if ( (cur_time - upd_time) > DUMPCAP_UPD_TIME) {
3273 gettimeofday(&cur_time, NULL);
3274 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3275 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3278 upd_time = cur_time;
3281 if (pcap_stats(pch, stats) >= 0) {
3282 *stats_known = TRUE;
3285 /* Let the parent process know. */
3286 if (global_ld.inpkts_to_sync_pipe) {
3288 libpcap_dump_flush(global_ld.pdh, NULL);
3290 /* Send our parent a message saying we've written out
3291 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3293 report_packet_count(global_ld.inpkts_to_sync_pipe);
3295 global_ld.inpkts_to_sync_pipe = 0;
3298 /* check capture duration condition */
3299 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3300 /* The maximum capture time has elapsed; stop the capture. */
3301 global_ld.go = FALSE;
3305 /* check capture file duration condition */
3306 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3307 /* duration limit reached, do we have another file? */
3308 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3309 cnd_autostop_size, cnd_file_duration))
3311 } /* cnd_file_duration */
3315 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3317 pcap_queue_element *queue_element;
3319 for (i = 0; i < global_ld.pcaps->len; i++) {
3320 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3321 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3322 pcap_opts->interface_id);
3323 g_thread_join(pcap_opts->tid);
3324 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3325 pcap_opts->interface_id);
3328 g_async_queue_lock(pcap_queue);
3329 queue_element = g_async_queue_try_pop_unlocked(pcap_queue);
3330 if (queue_element) {
3331 pcap_queue_bytes -= queue_element->phdr.caplen;
3332 pcap_queue_packets -= 1;
3334 g_async_queue_unlock(pcap_queue);
3335 if (queue_element == NULL) {
3338 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3339 "Dequeued a packet of length %d captured on interface %d.",
3340 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3341 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3342 &queue_element->phdr,
3344 g_free(queue_element->pd);
3345 g_free(queue_element);
3346 global_ld.inpkts_to_sync_pipe += 1;
3347 if (capture_opts->output_to_pipe) {
3348 libpcap_dump_flush(global_ld.pdh, NULL);
3354 /* delete stop conditions */
3355 if (cnd_file_duration != NULL)
3356 cnd_delete(cnd_file_duration);
3357 if (cnd_autostop_files != NULL)
3358 cnd_delete(cnd_autostop_files);
3359 if (cnd_autostop_size != NULL)
3360 cnd_delete(cnd_autostop_size);
3361 if (cnd_autostop_duration != NULL)
3362 cnd_delete(cnd_autostop_duration);
3364 /* did we have a pcap (input) error? */
3365 for (i = 0; i < capture_opts->ifaces->len; i++) {
3366 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3367 if (pcap_opts->pcap_err) {
3368 /* On Linux, if an interface goes down while you're capturing on it,
3369 you'll get a "recvfrom: Network is down" or
3370 "The interface went down" error (ENETDOWN).
3371 (At least you will if g_strerror() doesn't show a local translation
3374 On FreeBSD and OS X, if a network adapter disappears while
3375 you're capturing on it, you'll get a "read: Device not configured"
3376 error (ENXIO). (See previous parenthetical note.)
3378 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3380 These should *not* be reported to the Wireshark developers. */
3383 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3384 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3385 strcmp(cap_err_str, "The interface went down") == 0 ||
3386 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3387 strcmp(cap_err_str, "read: I/O error") == 0 ||
3388 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3389 report_capture_error("The network adapter on which the capture was being done "
3390 "is no longer running; the capture has stopped.",
3393 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3395 report_capture_error(errmsg, please_report);
3398 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3399 report_capture_error(errmsg, "");
3403 /* did we have an output error while capturing? */
3404 if (global_ld.err == 0) {
3407 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3408 global_ld.err, FALSE);
3409 report_capture_error(errmsg, please_report);
3413 if (capture_opts->saving_to_file) {
3414 /* close the output file */
3415 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3419 /* there might be packets not yet notified to the parent */
3420 /* (do this after closing the file, so all packets are already flushed) */
3421 if(global_ld.inpkts_to_sync_pipe) {
3423 report_packet_count(global_ld.inpkts_to_sync_pipe);
3424 global_ld.inpkts_to_sync_pipe = 0;
3427 /* If we've displayed a message about a write error, there's no point
3428 in displaying another message about an error on close. */
3429 if (!close_ok && write_ok) {
3430 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3432 report_capture_error(errmsg, "");
3436 * XXX We exhibit different behaviour between normal mode and sync mode
3437 * when the pipe is stdin and not already at EOF. If we're a child, the
3438 * parent's stdin isn't closed, so if the user starts another capture,
3439 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3440 * will say "Unrecognized libpcap format". On the other hand, in normal
3441 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3444 report_capture_count(TRUE);
3446 /* get packet drop statistics from pcap */
3447 for (i = 0; i < capture_opts->ifaces->len; i++) {
3451 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3452 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3453 received = pcap_opts->received;
3454 dropped = pcap_opts->dropped;
3455 if (pcap_opts->pcap_h != NULL) {
3456 g_assert(!pcap_opts->from_cap_pipe);
3457 /* Get the capture statistics, so we know how many packets were dropped. */
3458 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3459 *stats_known = TRUE;
3460 /* Let the parent process know. */
3461 dropped += stats->ps_drop;
3463 g_snprintf(errmsg, sizeof(errmsg),
3464 "Can't get packet-drop statistics: %s",
3465 pcap_geterr(pcap_opts->pcap_h));
3466 report_capture_error(errmsg, please_report);
3469 report_packet_drops(received, dropped, interface_opts.name);
3472 /* close the input file (pcap or capture pipe) */
3473 capture_loop_close_input(&global_ld);
3475 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3477 /* ok, if the write and the close were successful. */
3478 return write_ok && close_ok;
3481 if (capture_opts->multi_files_on) {
3482 /* cleanup ringbuffer */
3483 ringbuf_error_cleanup();
3485 /* We can't use the save file, and we have no FILE * for the stream
3486 to close in order to close it, so close the FD directly. */
3487 if (global_ld.save_file_fd != -1) {
3488 ws_close(global_ld.save_file_fd);
3491 /* We couldn't even start the capture, so get rid of the capture
3493 if (capture_opts->save_file != NULL) {
3494 ws_unlink(capture_opts->save_file);
3495 g_free(capture_opts->save_file);
3498 capture_opts->save_file = NULL;
3500 report_cfilter_error(capture_opts, error_index, errmsg);
3502 report_capture_error(errmsg, secondary_errmsg);
3504 /* close the input file (pcap or cap_pipe) */
3505 capture_loop_close_input(&global_ld);
3507 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3513 static void capture_loop_stop(void)
3515 #ifdef HAVE_PCAP_BREAKLOOP
3517 pcap_options *pcap_opts;
3519 for (i = 0; i < global_ld.pcaps->len; i++) {
3520 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3521 if (pcap_opts->pcap_h != NULL)
3522 pcap_breakloop(pcap_opts->pcap_h);
3525 global_ld.go = FALSE;
3530 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3531 int err, gboolean is_close)
3536 g_snprintf(errmsg, errmsglen,
3537 "Not all the packets could be written to the file"
3538 " to which the capture was being saved\n"
3539 "(\"%s\") because there is no space left on the file system\n"
3540 "on which that file resides.",
3546 g_snprintf(errmsg, errmsglen,
3547 "Not all the packets could be written to the file"
3548 " to which the capture was being saved\n"
3549 "(\"%s\") because you are too close to, or over,"
3550 " your disk quota\n"
3551 "on the file system on which that file resides.",
3558 g_snprintf(errmsg, errmsglen,
3559 "The file to which the capture was being saved\n"
3560 "(\"%s\") could not be closed: %s.",
3561 fname, g_strerror(err));
3563 g_snprintf(errmsg, errmsglen,
3564 "An error occurred while writing to the file"
3565 " to which the capture was being saved\n"
3567 fname, g_strerror(err));
3574 /* one packet was captured, process it */
3576 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3579 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3582 /* We may be called multiple times from pcap_dispatch(); if we've set
3583 the "stop capturing" flag, ignore this packet, as we're not
3584 supposed to be saving any more packets. */
3588 if (global_ld.pdh) {
3589 gboolean successful;
3591 /* We're supposed to write the packet to a file; do so.
3592 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3593 "ld->err" to the error. */
3594 if (global_capture_opts.use_pcapng) {
3595 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, pcap_opts->interface_id, pd, &global_ld.bytes_written, &err);
3597 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3600 global_ld.go = FALSE;
3601 global_ld.err = err;
3603 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3604 "Wrote a packet of length %d captured on interface %u.",
3605 phdr->caplen, pcap_opts->interface_id);
3606 global_ld.packet_count++;
3607 pcap_opts->received++;
3608 /* if the user told us to stop after x packets, do we already have enough? */
3609 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3610 global_ld.go = FALSE;
3616 /* one packet was captured, queue it */
3618 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3621 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3622 pcap_queue_element *queue_element;
3623 gboolean limit_reached;
3625 /* We may be called multiple times from pcap_dispatch(); if we've set
3626 the "stop capturing" flag, ignore this packet, as we're not
3627 supposed to be saving any more packets. */
3631 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3632 if (queue_element == NULL) {
3633 pcap_opts->dropped++;
3636 queue_element->pcap_opts = pcap_opts;
3637 queue_element->phdr = *phdr;
3638 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3639 if (queue_element->pd == NULL) {
3640 pcap_opts->dropped++;
3641 g_free(queue_element);
3644 memcpy(queue_element->pd, pd, phdr->caplen);
3645 g_async_queue_lock(pcap_queue);
3646 if (((pcap_queue_byte_limit > 0) && (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3647 ((pcap_queue_packet_limit > 0) && (pcap_queue_packets < pcap_queue_packet_limit))) {
3648 limit_reached = FALSE;
3649 g_async_queue_push_unlocked(pcap_queue, queue_element);
3650 pcap_queue_bytes += phdr->caplen;
3651 pcap_queue_packets += 1;
3653 limit_reached = TRUE;
3655 g_async_queue_unlock(pcap_queue);
3656 if (limit_reached) {
3657 pcap_opts->dropped++;
3658 g_free(queue_element->pd);
3659 g_free(queue_element);
3660 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3661 "Dropped a packet of length %d captured on interface %u.",
3662 phdr->caplen, pcap_opts->interface_id);
3664 pcap_opts->received++;
3665 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3666 "Queued a packet of length %d captured on interface %u.",
3667 phdr->caplen, pcap_opts->interface_id);
3669 /* I don't want to hold the mutex over the debug output. So the
3670 output may be wrong */
3671 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3672 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3673 pcap_queue_bytes, pcap_queue_packets);
3676 /* And now our feature presentation... [ fade to music ] */
3678 main(int argc, char *argv[])
3681 gboolean arg_error = FALSE;
3686 struct sigaction action, oldaction;
3689 gboolean start_capture = TRUE;
3690 gboolean stats_known;
3691 struct pcap_stat stats;
3692 GLogLevelFlags log_flags;
3693 gboolean list_interfaces = FALSE;
3694 gboolean list_link_layer_types = FALSE;
3695 #ifdef HAVE_BPF_IMAGE
3696 gboolean print_bpf_code = FALSE;
3698 gboolean machine_readable = FALSE;
3699 gboolean print_statistics = FALSE;
3700 int status, run_once_args = 0;
3703 #if defined(__APPLE__) && defined(__LP64__)
3704 struct utsname osinfo;
3708 arg_list_utf_16to8(argc, argv);
3713 * Initialize our DLL search path. MUST be called before LoadLibrary
3716 ws_init_dll_search_path();
3719 #ifdef HAVE_PCAP_REMOTE
3720 #define OPTSTRING_A "A:"
3721 #define OPTSTRING_r "r"
3722 #define OPTSTRING_u "u"
3724 #define OPTSTRING_A ""
3725 #define OPTSTRING_r ""
3726 #define OPTSTRING_u ""
3729 #ifdef HAVE_PCAP_SETSAMPLING
3730 #define OPTSTRING_m "m:"
3732 #define OPTSTRING_m ""
3735 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3736 #define OPTSTRING_B "B:"
3738 #define OPTSTRING_B ""
3739 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3741 #ifdef HAVE_PCAP_CREATE
3742 #define OPTSTRING_I "I"
3744 #define OPTSTRING_I ""
3747 #ifdef HAVE_BPF_IMAGE
3748 #define OPTSTRING_d "d"
3750 #define OPTSTRING_d ""
3753 #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:"
3755 #ifdef DEBUG_CHILD_DUMPCAP
3756 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3757 fprintf (stderr, "Unable to open debug log file !\n");
3762 #if defined(__APPLE__) && defined(__LP64__)
3764 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3765 * a bug workaround - timeouts less than 1 second don't work with libpcap
3766 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3767 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3768 * The problem is extremely unlikely to be reintroduced in a future
3771 if (uname(&osinfo) == 0) {
3773 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3774 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3775 * number of 10.0.0, not 10.1.0 - go figure).
3777 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3778 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3779 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3780 need_timeout_workaround = TRUE;
3785 * Determine if dumpcap is being requested to run in a special
3786 * capture_child mode by going thru the command line args to see if
3787 * a -Z is present. (-Z is a hidden option).
3789 * The primary result of running in capture_child mode is that
3790 * all messages sent out on stderr are in a special type/len/string
3791 * format to allow message processing by type. These messages include
3792 * error messages if dumpcap fails to start the operation it was
3793 * requested to do, as well as various "status" messages which are sent
3794 * when an actual capture is in progress, and a "success" message sent
3795 * if dumpcap was requested to perform an operation other than a
3798 * Capture_child mode would normally be requested by a parent process
3799 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3800 * to which dumpcap stderr has been redirected. It might also have
3801 * another pipe to obtain dumpcap stdout output; for operations other
3802 * than a capture, that information is formatted specially for easier
3803 * parsing by the parent process.
3805 * Capture_child mode needs to be determined immediately upon
3806 * startup so that any messages generated by dumpcap in this mode
3807 * (eg: during initialization) will be formatted properly.
3810 for (i=1; i<argc; i++) {
3811 if (strcmp("-Z", argv[i]) == 0) {
3812 capture_child = TRUE;
3813 machine_readable = TRUE; /* request machine-readable output */
3815 /* set output pipe to binary mode, to avoid ugly text conversions */
3816 _setmode(2, O_BINARY);
3821 /* The default_log_handler will use stdout, which makes trouble in */
3822 /* capture child mode, as it uses stdout for it's sync_pipe. */
3823 /* So: the filtering is done in the console_log_handler and not here.*/
3824 /* We set the log handlers right up front to make sure that any log */
3825 /* messages when running as child will be sent back to the parent */
3826 /* with the correct format. */
3830 G_LOG_LEVEL_CRITICAL|
3831 G_LOG_LEVEL_WARNING|
3832 G_LOG_LEVEL_MESSAGE|
3835 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3837 g_log_set_handler(NULL,
3839 console_log_handler, NULL /* user_data */);
3840 g_log_set_handler(LOG_DOMAIN_MAIN,
3842 console_log_handler, NULL /* user_data */);
3843 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3845 console_log_handler, NULL /* user_data */);
3846 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3848 console_log_handler, NULL /* user_data */);
3850 /* Initialize the pcaps list */
3851 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
3853 /* Initialize the thread system */
3854 if (!g_thread_supported())
3855 g_thread_init(NULL);
3857 /* Load wpcap if possible. Do this before collecting the run-time version information */
3860 /* ... and also load the packet.dll from wpcap */
3861 /* XXX - currently not required, may change later. */
3862 /*wpcap_packet_load();*/
3864 /* Start windows sockets */
3865 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3867 /* Set handler for Ctrl+C key */
3868 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3870 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3872 action.sa_handler = capture_cleanup_handler;
3874 * Arrange that system calls not get restarted, because when
3875 * our signal handler returns we don't want to restart
3876 * a call that was waiting for packets to arrive.
3878 action.sa_flags = 0;
3879 sigemptyset(&action.sa_mask);
3880 sigaction(SIGTERM, &action, NULL);
3881 sigaction(SIGINT, &action, NULL);
3882 sigaction(SIGPIPE, &action, NULL);
3883 sigaction(SIGHUP, NULL, &oldaction);
3884 if (oldaction.sa_handler == SIG_DFL)
3885 sigaction(SIGHUP, &action, NULL);
3888 /* Catch SIGINFO and, if we get it and we're capturing in
3889 quiet mode, report the number of packets we've captured. */
3890 action.sa_handler = report_counts_siginfo;
3891 action.sa_flags = SA_RESTART;
3892 sigemptyset(&action.sa_mask);
3893 sigaction(SIGINFO, &action, NULL);
3894 #endif /* SIGINFO */
3897 /* ----------------------------------------------------------------- */
3898 /* Privilege and capability handling */
3900 /* 1. Running not as root or suid root; no special capabilities. */
3903 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3906 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3908 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3909 /* capabilities; Drop all other capabilities; */
3910 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3911 /* else: after pcap_open_live() in capture_loop_open_input() */
3912 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3913 /* (Note: this means that the process, although logged in */
3914 /* as root, does not have various permissions such as the */
3915 /* ability to bypass file access permissions). */
3916 /* XXX: Should we just leave capabilities alone in this case */
3917 /* so that user gets expected effect that root can do */
3920 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3922 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3923 /* else: after pcap_open_live() in capture_loop_open_input() */
3924 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3925 /* pcap_open_live). */
3927 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3929 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3930 /* capabilities; Drop all other capabilities; */
3931 /* Drop suid privileges (euid=ruid); */
3932 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3933 /* else: after pcap_open_live() in capture_loop_open_input() */
3934 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3936 /* XXX: For some Linux versions/distros with capabilities */
3937 /* a 'normal' process with any capabilities cannot be */
3938 /* 'killed' (signaled) from another (same uid) non-privileged */
3940 /* For example: If (non-suid) Wireshark forks a */
3941 /* child suid dumpcap which acts as described here (case 5), */
3942 /* Wireshark will be unable to kill (signal) the child */
3943 /* dumpcap process until the capabilities have been dropped */
3944 /* (after pcap_open_live()). */
3945 /* This behaviour will apparently be changed in the kernel */
3946 /* to allow the kill (signal) in this case. */
3947 /* See the following for details: */
3948 /* http://www.mail-archive.com/ [wrapped] */
3949 /* linux-security-module@vger.kernel.org/msg02913.html */
3951 /* It is therefore conceivable that if dumpcap somehow hangs */
3952 /* in pcap_open_live or before that wireshark will not */
3953 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3954 /* In this case, exiting wireshark will kill the child */
3955 /* dumpcap process. */
3957 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3958 /* capabilities; Using libcap. Note: capset cmd (which see) */
3959 /* used to assign capabilities to file. */
3961 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3962 /* else: after pcap_open_live() in capture_loop_open_input() */
3963 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3965 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3966 /* longer required (similar to capture). */
3968 /* ----------------------------------------------------------------- */
3970 init_process_policies();
3973 /* If 'started with special privileges' (and using libcap) */
3974 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3975 /* Set euid/egid = ruid/rgid to remove suid privileges */
3976 relinquish_privs_except_capture();
3979 /* Set the initial values in the capture options. This might be overwritten
3980 by the command line parameters. */
3981 capture_opts_init(&global_capture_opts, NULL);
3983 /* We always save to a file - if no file was specified, we save to a
3985 global_capture_opts.saving_to_file = TRUE;
3986 global_capture_opts.has_ring_num_files = TRUE;
3988 /* Now get our args */
3989 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3991 case 'h': /* Print help and exit */
3995 case 'v': /* Show version and exit */
3997 GString *comp_info_str;
3998 GString *runtime_info_str;
3999 /* Assemble the compile-time version information string */
4000 comp_info_str = g_string_new("Compiled ");
4001 get_compiled_version_info(comp_info_str, NULL, NULL);
4003 /* Assemble the run-time version information string */
4004 runtime_info_str = g_string_new("Running ");
4005 get_runtime_version_info(runtime_info_str, NULL);
4006 show_version(comp_info_str, runtime_info_str);
4007 g_string_free(comp_info_str, TRUE);
4008 g_string_free(runtime_info_str, TRUE);
4012 /*** capture option specific ***/
4013 case 'a': /* autostop criteria */
4014 case 'b': /* Ringbuffer option */
4015 case 'c': /* Capture x packets */
4016 case 'f': /* capture filter */
4017 case 'i': /* Use interface x */
4018 case 'n': /* Use pcapng format */
4019 case 'p': /* Don't capture in promiscuous mode */
4020 case 'P': /* Use pcap format */
4021 case 's': /* Set the snapshot (capture) length */
4022 case 'w': /* Write to capture file x */
4023 case 'g': /* enable group read accesson file(s) */
4024 case 'y': /* Set the pcap data link type */
4025 #ifdef HAVE_PCAP_REMOTE
4026 case 'u': /* Use UDP for data transfer */
4027 case 'r': /* Capture own RPCAP traffic too */
4028 case 'A': /* Authentication */
4030 #ifdef HAVE_PCAP_SETSAMPLING
4031 case 'm': /* Sampling */
4033 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4034 case 'B': /* Buffer size */
4035 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4036 #ifdef HAVE_PCAP_CREATE
4037 case 'I': /* Monitor mode */
4039 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4044 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4046 capture_child = TRUE;
4048 /* set output pipe to binary mode, to avoid ugly text conversions */
4049 _setmode(2, O_BINARY);
4051 * optarg = the control ID, aka the PPID, currently used for the
4054 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4055 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4056 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4057 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4059 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4060 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4061 "Signal pipe: Unable to open %s. Dead parent?",
4069 case 'q': /* Quiet */
4076 /*** all non capture option specific ***/
4077 case 'D': /* Print a list of capture devices and exit */
4078 list_interfaces = TRUE;
4081 case 'L': /* Print list of link-layer types and exit */
4082 list_link_layer_types = TRUE;
4085 #ifdef HAVE_BPF_IMAGE
4086 case 'd': /* Print BPF code for capture filter and exit */
4087 print_bpf_code = TRUE;
4091 case 'S': /* Print interface statistics once a second */
4092 print_statistics = TRUE;
4095 case 'M': /* For -D, -L, and -S, print machine-readable output */
4096 machine_readable = TRUE;
4099 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4100 case '?': /* Bad flag - print usage message */
4109 /* user specified file name as regular command-line argument */
4110 /* XXX - use it as the capture file name (or something else)? */
4116 * Extra command line arguments were specified; complain.
4117 * XXX - interpret as capture filter, as tcpdump and tshark do?
4119 cmdarg_err("Invalid argument: %s", argv[0]);
4129 if (run_once_args > 1) {
4130 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4132 } else if (run_once_args == 1) {
4133 /* We're supposed to print some information, rather than
4134 to capture traffic; did they specify a ring buffer option? */
4135 if (global_capture_opts.multi_files_on) {
4136 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4140 /* We're supposed to capture traffic; */
4141 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4142 if (global_capture_opts.ifaces->len > 1) {
4144 global_capture_opts.use_pcapng = TRUE;
4146 /* Was the ring buffer option specified and, if so, does it make sense? */
4147 if (global_capture_opts.multi_files_on) {
4148 /* Ring buffer works only under certain conditions:
4149 a) ring buffer does not work with temporary files;
4150 b) it makes no sense to enable the ring buffer if the maximum
4151 file size is set to "infinite". */
4152 if (global_capture_opts.save_file == NULL) {
4153 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4154 global_capture_opts.multi_files_on = FALSE;
4156 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4157 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4159 /* XXX - this must be redesigned as the conditions changed */
4160 global_capture_opts.multi_files_on = FALSE;
4167 * "-D" requires no interface to be selected; it's supposed to list
4170 if (list_interfaces) {
4171 /* Get the list of interfaces */
4176 if_list = capture_interface_list(&err, &err_str);
4177 if (if_list == NULL) {
4179 case CANT_GET_INTERFACE_LIST:
4180 cmdarg_err("%s", err_str);
4185 case NO_INTERFACES_FOUND:
4187 * If we're being run by another program, just give them
4188 * an empty list of interfaces, don't report this as
4189 * an error; that lets them decide whether to report
4190 * this as an error or not.
4192 if (!machine_readable) {
4193 cmdarg_err("There are no interfaces on which a capture can be done");
4200 if (machine_readable) /* tab-separated values to stdout */
4201 print_machine_readable_interfaces(if_list);
4203 capture_opts_print_interfaces(if_list);
4204 free_interface_list(if_list);
4209 * "-S" requires no interface to be selected; it gives statistics
4210 * for all interfaces.
4212 if (print_statistics) {
4213 status = print_statistics_loop(machine_readable);
4218 * "-L", "-d", and capturing act on a particular interface, so we have to
4219 * have an interface; if none was specified, pick a default.
4221 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4222 /* cmdarg_err() already called .... */
4226 /* Let the user know what interfaces were chosen. */
4227 /* get_interface_descriptive_name() is not available! */
4228 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4229 interface_options interface_opts;
4231 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4232 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s", interface_opts.name);
4235 if (list_link_layer_types) {
4236 /* Get the list of link-layer types for the capture device. */
4237 if_capabilities_t *caps;
4241 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4242 interface_options interface_opts;
4244 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4245 caps = get_if_capabilities(interface_opts.name,
4246 interface_opts.monitor_mode, &err_str);
4248 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4249 "Please check to make sure you have sufficient permissions, and that\n"
4250 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4254 if (caps->data_link_types == NULL) {
4255 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4258 if (machine_readable) /* tab-separated values to stdout */
4259 /* XXX: We need to change the format and adopt consumers */
4260 print_machine_readable_if_capabilities(caps);
4262 /* XXX: We might want to print also the interface name */
4263 capture_opts_print_if_capabilities(caps, interface_opts.name,
4264 interface_opts.monitor_mode);
4265 free_if_capabilities(caps);
4270 /* We're supposed to do a capture, or print the BPF code for a filter.
4271 Process the snapshot length, as that affects the generated BPF code. */
4272 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4274 #ifdef HAVE_BPF_IMAGE
4275 if (print_bpf_code) {
4276 show_filter_code(&global_capture_opts);
4281 /* We're supposed to do a capture. Process the ring buffer arguments. */
4282 capture_opts_trim_ring_num_files(&global_capture_opts);
4284 /* Now start the capture. */
4286 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4290 /* capture failed */
4293 return 0; /* never here, make compiler happy */
4298 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4299 const char *message, gpointer user_data _U_)
4306 /* ignore log message, if log_level isn't interesting */
4307 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4308 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4313 /* create a "timestamp" */
4315 today = localtime(&curr);
4317 switch(log_level & G_LOG_LEVEL_MASK) {
4318 case G_LOG_LEVEL_ERROR:
4321 case G_LOG_LEVEL_CRITICAL:
4324 case G_LOG_LEVEL_WARNING:
4327 case G_LOG_LEVEL_MESSAGE:
4330 case G_LOG_LEVEL_INFO:
4333 case G_LOG_LEVEL_DEBUG:
4337 fprintf(stderr, "unknown log_level %u\n", log_level);
4339 g_assert_not_reached();
4342 /* Generate the output message */
4343 if(log_level & G_LOG_LEVEL_MESSAGE) {
4344 /* normal user messages without additional infos */
4345 msg = g_strdup_printf("%s\n", message);
4347 /* info/debug messages with additional infos */
4348 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4349 today->tm_hour, today->tm_min, today->tm_sec,
4350 log_domain != NULL ? log_domain : "",
4354 /* DEBUG & INFO msgs (if we're debugging today) */
4355 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4356 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4357 #ifdef DEBUG_DUMPCAP
4358 fprintf(stderr, "%s", msg);
4361 #ifdef DEBUG_CHILD_DUMPCAP
4362 fprintf(debug_log, "%s", msg);
4370 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4371 /* to parent especially formatted if dumpcap running as child. */
4372 if (capture_child) {
4373 sync_pipe_errmsg_to_parent(2, msg, "");
4375 fprintf(stderr, "%s", msg);
4382 /****************************************************************************************************************/
4383 /* indication report routines */
4387 report_packet_count(int packet_count)
4389 char tmp[SP_DECISIZE+1+1];
4390 static int count = 0;
4393 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4394 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4395 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4397 count += packet_count;
4398 fprintf(stderr, "\rPackets: %u ", count);
4399 /* stderr could be line buffered */
4405 report_new_capture_file(const char *filename)
4408 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4409 pipe_write_block(2, SP_FILE, filename);
4413 * Prevent a SIGINFO handler from writing to the standard error
4414 * while we're doing so; instead, have it just set a flag telling
4415 * us to print that information when we're done.
4418 #endif /* SIGINFO */
4419 fprintf(stderr, "File: %s\n", filename);
4420 /* stderr could be line buffered */
4425 * Allow SIGINFO handlers to write.
4430 * If a SIGINFO handler asked us to write out capture counts, do so.
4433 report_counts_for_siginfo();
4434 #endif /* SIGINFO */
4439 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4441 interface_options interface_opts;
4442 char tmp[MSG_MAX_LENGTH+1+6];
4444 if (i < capture_opts->ifaces->len) {
4445 if (capture_child) {
4446 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4447 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4448 pipe_write_block(2, SP_BAD_FILTER, tmp);
4451 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4452 * the error message below.
4454 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4456 "Invalid capture filter \"%s\" for interface %s!\n"
4458 "That string isn't a valid capture filter (%s).\n"
4459 "See the User's Guide for a description of the capture filter syntax.\n",
4460 interface_opts.cfilter, interface_opts.name, errmsg);
4466 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4469 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4470 "Primary Error: %s", error_msg);
4471 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4472 "Secondary Error: %s", secondary_error_msg);
4473 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4475 fprintf(stderr, "%s\n", error_msg);
4476 if (secondary_error_msg[0] != '\0')
4477 fprintf(stderr, "%s\n", secondary_error_msg);
4482 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4484 char tmp[SP_DECISIZE+1+1];
4486 g_snprintf(tmp, sizeof(tmp), "%u", drops);
4489 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4490 "Packets received/dropped on interface %s: %u/%u",
4491 name, received, drops);
4492 /* XXX: Need to provide interface id, changes to consumers required. */
4493 pipe_write_block(2, SP_DROPS, tmp);
4496 "Packets received/dropped on interface %s: %u/%u (%.1f%%)\n",
4497 name, received, drops,
4498 received ? 100.0 * received / (received + drops) : 0.0);
4499 /* stderr could be line buffered */
4505 /****************************************************************************************************************/
4506 /* signal_pipe handling */
4511 signal_pipe_check_running(void)
4513 /* any news from our parent? -> just stop the capture */
4517 /* if we are running standalone, no check required */
4518 if(!capture_child) {
4522 if(!sig_pipe_name || !sig_pipe_handle) {
4523 /* This shouldn't happen */
4524 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4525 "Signal pipe: No name or handle");
4530 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4531 * at this point. Should we check to see if the parent is still alive,
4532 * e.g. by using OpenProcess?
4535 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4537 if(!result || avail > 0) {
4538 /* peek failed or some bytes really available */
4539 /* (if not piping from stdin this would fail) */
4540 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4541 "Signal pipe: Stop capture: %s", sig_pipe_name);
4542 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4543 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4544 sig_pipe_handle, result, avail);
4547 /* pipe ok and no bytes available */
4554 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4559 * indent-tabs-mode: nil
4562 * vi: set shiftwidth=4 tabstop=8 expandtab
4563 * :indentSize=4:tabSize=8:noTabs=true: