5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
65 #include "wsutil/wsgetopt.h"
73 # include <sys/prctl.h>
74 # include <sys/capability.h>
77 #include "ringbuffer.h"
78 #include "clopts_common.h"
79 #include "console_io.h"
80 #include "cmdarg_err.h"
81 #include "version_info.h"
83 #include "capture-pcap-util.h"
89 #include "capture-wpcap.h"
90 #include <wsutil/unicode-utils.h>
94 #include <sys/socket.h>
98 #ifdef NEED_INET_V6DEFS_H
99 # include "wsutil/inet_v6defs.h"
102 #include <wsutil/privileges.h>
104 #include "sync_pipe.h"
106 #include "capture_opts.h"
107 #include "capture_ifinfo.h"
108 #include "capture_sync.h"
110 #include "conditions.h"
111 #include "capture_stop_conditions.h"
113 #include "tempfile.h"
115 #include "wsutil/file_util.h"
118 * Get information about libpcap format from "wiretap/libpcap.h".
119 * XXX - can we just use pcap_open_offline() to read the pipe?
121 #include "wiretap/libpcap.h"
123 /**#define DEBUG_DUMPCAP**/
124 /**#define DEBUG_CHILD_DUMPCAP**/
126 #ifdef DEBUG_CHILD_DUMPCAP
127 FILE *debug_log; /* for logging debug messages to */
128 /* a file if DEBUG_CHILD_DUMPCAP */
136 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
138 static gchar *sig_pipe_name = NULL;
139 static HANDLE sig_pipe_handle = NULL;
140 static gboolean signal_pipe_check_running(void);
144 static GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
145 static GMutex *cap_pipe_read_mtx;
149 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
150 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
153 /** Stop a low-level capture (stops the capture child). */
154 static void capture_loop_stop(void);
156 #if !defined (__linux__)
157 #ifndef HAVE_PCAP_BREAKLOOP
159 * We don't have pcap_breakloop(), which is the only way to ensure that
160 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
161 * won't, if the call to read the next packet or batch of packets is
162 * is interrupted by a signal on UN*X, just go back and try again to
165 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
166 * the signal handler, set a flag to stop capturing; however, without
167 * a guarantee of that sort, we can't guarantee that we'll stop capturing
168 * if the read will be retried and won't time out if no packets arrive.
170 * Therefore, on at least some platforms, we work around the lack of
171 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
172 * to wait for packets to arrive, so that we're probably going to be
173 * blocked in the select() when the signal arrives, and can just bail
174 * out of the loop at that point.
176 * However, we don't want to do that on BSD (because "select()" doesn't work
177 * correctly on BPF devices on at least some releases of some flavors of
178 * BSD), and we don't want to do it on Windows (because "select()" is
179 * something for sockets, not for arbitrary handles). (Note that "Windows"
180 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
181 * using WinPcap, not a UNIX libpcap.)
183 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
184 * on BSD times out even if no packets have arrived, so we'll eventually
185 * exit pcap_dispatch() with an indication that no packets have arrived,
186 * and will break out of the capture loop at that point.
188 * On Windows, we can't send a SIGINT to stop capturing, so none of this
189 * applies in any case.
191 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
192 * want to include it if it's not present on this platform, however.
194 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
195 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
197 # define MUST_DO_SELECT
198 # endif /* avoid select */
199 #endif /* HAVE_PCAP_BREAKLOOP */
201 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
202 * in pcap_dispatch(); on the other hand, select() works just fine there.
203 * Hence we use a select for that come what may.
205 #define MUST_DO_SELECT
208 /** init the capture filter */
211 INITFILTER_BAD_FILTER,
212 INITFILTER_OTHER_ERROR
213 } initfilter_status_t;
215 typedef struct _loop_data {
217 gboolean go; /* TRUE as long as we're supposed to keep capturing */
218 int err; /* if non-zero, error seen while capturing */
219 gint packet_count; /* Number of packets we have already captured */
220 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
221 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
223 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
226 /* pcap "input file" */
227 pcap_t *pcap_h; /* pcap handle */
228 gboolean pcap_err; /* TRUE if error from pcap */
229 #ifdef MUST_DO_SELECT
230 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;
263 guint32 autostop_files;
267 * Standard secondary message for unexpected errors.
269 static const char please_report[] =
270 "Please report this to the Wireshark developers.\n"
271 "(This is not a crash; please do not report it as such.)";
274 * This needs to be static, so that the SIGINT handler can clear the "go"
277 static loop_data global_ld;
281 * Timeout, in milliseconds, for reads from the stream of captured packets
282 * from a capture device.
284 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
285 * 64-bit applications, with sub-second timeouts not to work. The bug is
286 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
288 #if defined(__APPLE__) && defined(__LP64__)
289 static gboolean need_timeout_workaround;
291 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
293 #define CAP_READ_TIMEOUT 250
297 * Timeout, in microseconds, for reads from the stream of captured packets
298 * from a pipe. Pipes don't have the same problem that BPF devices do
299 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
300 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
301 * of the offending versions of Snow Leopard.
303 * On Windows this value is converted to milliseconds and passed to
304 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
305 * will return immediately.
308 #define PIPE_READ_TIMEOUT 250000
310 #define PIPE_READ_TIMEOUT 100000
312 static const char *cap_pipe_err_str;
315 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
316 const char *message, gpointer user_data _U_);
318 /* capture related options */
319 static capture_options global_capture_opts;
320 static gboolean quiet = FALSE;
322 static void capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
324 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
325 int err, gboolean is_close);
327 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
329 static void report_new_capture_file(const char *filename);
330 static void report_packet_count(int packet_count);
331 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
332 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
333 static void report_cfilter_error(const char *cfilter, const char *errmsg);
335 #define MSG_MAX_LENGTH 4096
338 print_usage(gboolean print_ver)
345 "Dumpcap " VERSION "%s\n"
346 "Capture network packets and dump them into a libpcap file.\n"
347 "See http://www.wireshark.org for more information.\n",
348 wireshark_svnversion);
352 fprintf(output, "\nUsage: dumpcap [options] ...\n");
353 fprintf(output, "\n");
354 fprintf(output, "Capture interface:\n");
355 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
356 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
357 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
358 fprintf(output, " -p don't capture in promiscuous mode\n");
359 #ifdef HAVE_PCAP_CREATE
360 fprintf(output, " -I capture in monitor mode, if available\n");
362 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
363 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
365 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
366 fprintf(output, " -D print list of interfaces and exit\n");
367 fprintf(output, " -L print list of link-layer types of iface and exit\n");
368 #ifdef HAVE_BPF_IMAGE
369 fprintf(output, " -d print generated BPF code for capture filter\n");
371 fprintf(output, " -S print statistics for each interface once every second\n");
372 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
373 fprintf(output, "\n");
374 #ifdef HAVE_PCAP_REMOTE
375 fprintf(output, "\nRPCAP options:\n");
376 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
377 fprintf(output, " -u use UDP for RPCAP data transfer\n");
378 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
379 #ifdef HAVE_PCAP_SETSAMPLING
380 fprintf(output, " -m <sampling type> use packet sampling\n");
381 fprintf(output, " count:NUM - capture one packet of every NUM\n");
382 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
385 fprintf(output, "Stop conditions:\n");
386 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
387 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
388 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
389 fprintf(output, " files:NUM - stop after NUM files\n");
390 /*fprintf(output, "\n");*/
391 fprintf(output, "Output (files):\n");
392 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
393 fprintf(output, " -g enable group read access on the output file(s)\n");
394 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
395 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
396 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
397 fprintf(output, " -n use pcapng format instead of pcap\n");
398 /*fprintf(output, "\n");*/
399 fprintf(output, "Miscellaneous:\n");
400 fprintf(output, " -q don't report packet capture counts\n");
401 fprintf(output, " -v print version information and exit\n");
402 fprintf(output, " -h display this help and exit\n");
403 fprintf(output, "\n");
404 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
405 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
406 fprintf(output, "\n");
407 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
411 show_version(GString *comp_info_str, GString *runtime_info_str)
414 "Dumpcap " VERSION "%s\n"
419 "See http://www.wireshark.org for more information.\n",
420 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
424 * Print to the standard error. This is a command-line tool, so there's
425 * no need to pop up a console.
428 vfprintf_stderr(const char *fmt, va_list ap)
430 vfprintf(stderr, fmt, ap);
434 fprintf_stderr(const char *fmt, ...)
439 vfprintf_stderr(fmt, ap);
444 * Report an error in command-line arguments.
447 cmdarg_err(const char *fmt, ...)
453 /* Generate a 'special format' message back to parent */
455 msg = g_strdup_vprintf(fmt, ap);
456 sync_pipe_errmsg_to_parent(2, msg, "");
461 fprintf(stderr, "dumpcap: ");
462 vfprintf(stderr, fmt, ap);
463 fprintf(stderr, "\n");
469 * Report additional information for an error in command-line arguments.
472 cmdarg_err_cont(const char *fmt, ...)
479 msg = g_strdup_vprintf(fmt, ap);
480 sync_pipe_errmsg_to_parent(2, msg, "");
485 vfprintf(stderr, fmt, ap);
486 fprintf(stderr, "\n");
493 #if 0 /* Set to enable capability debugging */
494 /* see 'man cap_to_text()' for explanation of output */
495 /* '=' means 'all= ' ie: no capabilities */
496 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
498 print_caps(const char *pfx) {
499 cap_t caps = cap_get_proc();
500 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
501 "%s: EUID: %d Capabilities: %s", pfx,
502 geteuid(), cap_to_text(caps, NULL));
505 print_caps(const char *pfx _U_) {
510 relinquish_all_capabilities(void)
512 /* Drop any and all capabilities this process may have. */
513 /* Allowed whether or not process has any privileges. */
514 cap_t caps = cap_init(); /* all capabilities initialized to off */
515 print_caps("Pre-clear");
516 if (cap_set_proc(caps)) {
517 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
519 print_caps("Post-clear");
525 open_capture_device(interface_options *interface_opts,
526 #ifdef HAVE_PCAP_OPEN
527 capture_options *capture_opts,
529 capture_options *capture_opts _U_,
531 char (*open_err_str)[PCAP_ERRBUF_SIZE])
534 #ifdef HAVE_PCAP_CREATE
537 #ifdef HAVE_PCAP_REMOTE
538 struct pcap_rmtauth auth;
541 /* Open the network interface to capture from it.
542 Some versions of libpcap may put warnings into the error buffer
543 if they succeed; to tell if that's happened, we have to clear
544 the error buffer, and check if it's still a null string. */
545 (*open_err_str)[0] = '\0';
546 #ifdef HAVE_PCAP_OPEN
548 * If we're opening a remote device, use pcap_open(); that's currently
549 * the only open routine that supports remote devices.
551 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
552 auth.type = capture_opts->auth_type == CAPTURE_AUTH_PWD ?
553 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
554 auth.username = capture_opts->auth_username;
555 auth.password = capture_opts->auth_password;
557 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
559 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
560 (capture_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
561 (capture_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
562 CAP_READ_TIMEOUT, &auth, *open_err_str);
564 #endif /* HAVE_PCAP_OPEN */
567 * If we're not opening a remote device, use pcap_create() and
568 * pcap_activate() if we have them, so that we can set the buffer
569 * size, otherwise use pcap_open_live().
571 #ifdef HAVE_PCAP_CREATE
572 pcap_h = pcap_create(interface_opts->name, *open_err_str);
573 if (pcap_h != NULL) {
574 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
575 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
576 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
578 if (interface_opts->buffer_size > 1) {
579 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
581 if (interface_opts->monitor_mode)
582 pcap_set_rfmon(pcap_h, 1);
583 err = pcap_activate(pcap_h);
585 /* Failed to activate, set to NULL */
586 if (err == PCAP_ERROR)
587 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
589 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
595 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
596 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
601 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
602 /* to remove any suid privileges. */
603 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
604 /* (euid/egid have already previously been set to ruid/rgid. */
605 /* (See comment in main() for details) */
607 relinquish_special_privs_perm();
609 relinquish_all_capabilities();
616 get_capture_device_open_failure_messages(const char *open_err_str,
622 char *errmsg, size_t errmsg_len,
623 char *secondary_errmsg,
624 size_t secondary_errmsg_len)
626 const char *libpcap_warn;
627 static const char ppamsg[] = "can't find PPA for ";
629 /* If we got a "can't find PPA for X" message, warn the user (who
630 is running dumcap on HP-UX) that they don't have a version of
631 libpcap that properly handles HP-UX (libpcap 0.6.x and later
632 versions, which properly handle HP-UX, say "can't find /dev/dlpi
633 PPA for X" rather than "can't find PPA for X"). */
634 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
637 "You are running (T)Wireshark with a version of the libpcap library\n"
638 "that doesn't handle HP-UX network devices well; this means that\n"
639 "(T)Wireshark may not be able to capture packets.\n"
641 "To fix this, you should install libpcap 0.6.2, or a later version\n"
642 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
643 "packaged binary form from the Software Porting And Archive Centre\n"
644 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
645 "at the URL lists a number of mirror sites.";
648 g_snprintf(errmsg, (gulong) errmsg_len,
649 "The capture session could not be initiated (%s).", open_err_str);
651 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
652 "Please check to make sure you have sufficient permissions, and that you have "
653 "the proper interface or pipe specified.%s", libpcap_warn);
655 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
657 "Please check that \"%s\" is the proper interface.\n"
660 "Help can be found at:\n"
662 " http://wiki.wireshark.org/WinPcap\n"
663 " http://wiki.wireshark.org/CaptureSetup\n",
668 /* Set the data link type on a pcap. */
670 set_pcap_linktype(pcap_t *pcap_h, capture_options *capture_opts,
671 char *errmsg, size_t errmsg_len,
672 char *secondary_errmsg, size_t secondary_errmsg_len)
674 char *set_linktype_err_str;
676 if (capture_opts->linktype == -1)
677 return TRUE; /* just use the default */
678 #ifdef HAVE_PCAP_SET_DATALINK
679 if (pcap_set_datalink(pcap_h, capture_opts->linktype) == 0)
680 return TRUE; /* no error */
681 set_linktype_err_str = pcap_geterr(pcap_h);
683 /* Let them set it to the type it is; reject any other request. */
684 if (get_pcap_linktype(pcap_h, capture_opts->iface) == capture_opts->linktype)
685 return TRUE; /* no error */
686 set_linktype_err_str =
687 "That DLT isn't one of the DLTs supported by this device";
689 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
690 set_linktype_err_str);
692 * If the error isn't "XXX is not one of the DLTs supported by this device",
693 * tell the user to tell the Wireshark developers about it.
695 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
696 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
698 secondary_errmsg[0] = '\0';
703 compile_capture_filter(const char *iface, pcap_t *pcap_h,
704 struct bpf_program *fcode, char *cfilter)
706 bpf_u_int32 netnum, netmask;
707 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
709 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
711 * Well, we can't get the netmask for this interface; it's used
712 * only for filters that check for broadcast IP addresses, so
713 * we just punt and use 0. It might be nice to warn the user,
714 * but that's a pain in a GUI application, as it'd involve popping
715 * up a message box, and it's not clear how often this would make
716 * a difference (only filters that check for IP broadcast addresses
720 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
723 if (pcap_compile(pcap_h, fcode, cfilter, 1, netmask) < 0)
728 #ifdef HAVE_BPF_IMAGE
730 show_filter_code(capture_options *capture_opts)
732 interface_options interface_opts;
734 gchar open_err_str[PCAP_ERRBUF_SIZE];
735 char errmsg[MSG_MAX_LENGTH+1];
736 char secondary_errmsg[MSG_MAX_LENGTH+1];
737 struct bpf_program fcode;
738 struct bpf_insn *insn;
742 for (j = 0; j < capture_opts->number_of_ifaces; j++) {
743 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
744 pcap_h = open_capture_device(&interface_opts, capture_opts, &open_err_str);
745 if (pcap_h == NULL) {
746 /* Open failed; get messages */
747 get_capture_device_open_failure_messages(open_err_str,
749 errmsg, sizeof errmsg,
751 sizeof secondary_errmsg);
752 /* And report them */
753 report_capture_error(errmsg, secondary_errmsg);
757 /* Set the link-layer type. */
758 if (!set_pcap_linktype(pcap_h, capture_opts, errmsg, sizeof errmsg,
759 secondary_errmsg, sizeof secondary_errmsg)) {
761 report_capture_error(errmsg, secondary_errmsg);
765 /* OK, try to compile the capture filter. */
766 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
767 interface_opts.cfilter)) {
769 report_cfilter_error(interface_opts.cfilter, errmsg);
774 /* Now print the filter code. */
775 insn = fcode.bf_insns;
777 for (i = 0; i < fcode.bf_len; insn++, i++)
778 printf("%s\n", bpf_image(insn, i));
781 /* Let our parent know we succeeded. */
782 pipe_write_block(2, SP_SUCCESS, NULL);
789 * capture_interface_list() is expected to do the right thing to get
790 * a list of interfaces.
792 * In most of the programs in the Wireshark suite, "the right thing"
793 * is to run dumpcap and ask it for the list, because dumpcap may
794 * be the only program in the suite with enough privileges to get
797 * In dumpcap itself, however, we obviously can't run dumpcap to
798 * ask for the list. Therefore, our capture_interface_list() should
799 * just call get_interface_list().
802 capture_interface_list(int *err, char **err_str)
804 return get_interface_list(err, err_str);
808 * Get the data-link type for a libpcap device.
809 * This works around AIX 5.x's non-standard and incompatible-with-the-
810 * rest-of-the-universe libpcap.
813 get_pcap_linktype(pcap_t *pch, const char *devname
821 const char *ifacename;
824 linktype = pcap_datalink(pch);
828 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
829 * rather than DLT_ values for link-layer types; the ifType values
830 * for LAN devices are:
837 * and the ifType value for a loopback device is 24.
839 * The AIX names for LAN devices begin with:
846 * and the AIX names for loopback devices begin with "lo".
848 * (The difference between "Ethernet" and "802.3" is presumably
849 * whether packets have an Ethernet header, with a packet type,
850 * or an 802.3 header, with a packet length, followed by an 802.2
851 * header and possibly a SNAP header.)
853 * If the device name matches "linktype" interpreted as an ifType
854 * value, rather than as a DLT_ value, we will assume this is AIX's
855 * non-standard, incompatible libpcap, rather than a standard libpcap,
856 * and will map the link-layer type to the standard DLT_ value for
857 * that link-layer type, as that's what the rest of Wireshark expects.
859 * (This means the capture files won't be readable by a tcpdump
860 * linked with AIX's non-standard libpcap, but so it goes. They
861 * *will* be readable by standard versions of tcpdump, Wireshark,
864 * XXX - if we conclude we're using AIX libpcap, should we also
865 * set a flag to cause us to assume the time stamps are in
866 * seconds-and-nanoseconds form, and to convert them to
867 * seconds-and-microseconds form before processing them and
872 * Find the last component of the device name, which is the
875 ifacename = strchr(devname, '/');
876 if (ifacename == NULL)
879 /* See if it matches any of the LAN device names. */
880 if (strncmp(ifacename, "en", 2) == 0) {
883 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
887 } else if (strncmp(ifacename, "et", 2) == 0) {
890 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
891 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
896 } else if (strncmp(ifacename, "tr", 2) == 0) {
899 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
900 * DLT_IEEE802, which is what's used for Token Ring.
904 } else if (strncmp(ifacename, "fi", 2) == 0) {
905 if (linktype == 15) {
907 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
911 } else if (strncmp(ifacename, "lo", 2) == 0) {
912 if (linktype == 24) {
914 * That's the RFC 1573 value for "software loopback" devices; map it
915 * to DLT_NULL, which is what's used for loopback devices on BSD.
925 static data_link_info_t *
926 create_data_link_info(int dlt)
928 data_link_info_t *data_link_info;
931 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
932 data_link_info->dlt = dlt;
933 text = pcap_datalink_val_to_name(dlt);
935 data_link_info->name = g_strdup(text);
937 data_link_info->name = g_strdup_printf("DLT %d", dlt);
938 text = pcap_datalink_val_to_description(dlt);
940 data_link_info->description = g_strdup(text);
942 data_link_info->description = NULL;
943 return data_link_info;
947 * Get the capabilities of a network device.
949 static if_capabilities_t *
950 get_if_capabilities(const char *devname, gboolean monitor_mode
951 #ifndef HAVE_PCAP_CREATE
956 if_capabilities_t *caps;
957 char errbuf[PCAP_ERRBUF_SIZE];
959 #ifdef HAVE_PCAP_CREATE
963 #ifdef HAVE_PCAP_LIST_DATALINKS
967 data_link_info_t *data_link_info;
970 * Allocate the interface capabilities structure.
972 caps = g_malloc(sizeof *caps);
974 #ifdef HAVE_PCAP_OPEN
975 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
976 caps->can_set_rfmon = FALSE;
979 *err_str = g_strdup(errbuf);
983 #elif defined(HAVE_PCAP_CREATE)
984 pch = pcap_create(devname, errbuf);
987 *err_str = g_strdup(errbuf);
991 status = pcap_can_set_rfmon(pch);
994 if (status == PCAP_ERROR)
995 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
998 *err_str = g_strdup(pcap_statustostr(status));
1004 caps->can_set_rfmon = FALSE;
1005 else if (status == 1) {
1006 caps->can_set_rfmon = TRUE;
1008 pcap_set_rfmon(pch, 1);
1010 if (err_str != NULL) {
1011 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1019 status = pcap_activate(pch);
1021 /* Error. We ignore warnings (status > 0). */
1022 if (err_str != NULL) {
1023 if (status == PCAP_ERROR)
1024 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1027 *err_str = g_strdup(pcap_statustostr(status));
1034 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1035 caps->can_set_rfmon = FALSE;
1037 if (err_str != NULL)
1038 *err_str = g_strdup(errbuf);
1043 deflt = get_pcap_linktype(pch, devname);
1044 #ifdef HAVE_PCAP_LIST_DATALINKS
1045 nlt = pcap_list_datalinks(pch, &linktypes);
1046 if (nlt == 0 || linktypes == NULL) {
1048 if (err_str != NULL)
1049 *err_str = NULL; /* an empty list doesn't mean an error */
1052 caps->data_link_types = NULL;
1053 for (i = 0; i < nlt; i++) {
1054 data_link_info = create_data_link_info(linktypes[i]);
1057 * XXX - for 802.11, make the most detailed 802.11
1058 * version the default, rather than the one the
1059 * device has as the default?
1061 if (linktypes[i] == deflt)
1062 caps->data_link_types = g_list_prepend(caps->data_link_types,
1065 caps->data_link_types = g_list_append(caps->data_link_types,
1068 #ifdef HAVE_PCAP_FREE_DATALINKS
1069 pcap_free_datalinks(linktypes);
1072 * In Windows, there's no guarantee that if you have a library
1073 * built with one version of the MSVC++ run-time library, and
1074 * it returns a pointer to allocated data, you can free that
1075 * data from a program linked with another version of the
1076 * MSVC++ run-time library.
1078 * This is not an issue on UN*X.
1080 * See the mail threads starting at
1082 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1086 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1089 #define xx_free free /* hack so checkAPIs doesn't complain */
1092 #endif /* HAVE_PCAP_FREE_DATALINKS */
1093 #else /* HAVE_PCAP_LIST_DATALINKS */
1095 data_link_info = create_data_link_info(deflt);
1096 caps->data_link_types = g_list_append(caps->data_link_types,
1098 #endif /* HAVE_PCAP_LIST_DATALINKS */
1102 if (err_str != NULL)
1107 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1109 print_machine_readable_interfaces(GList *if_list)
1116 char addr_str[ADDRSTRLEN];
1118 if (capture_child) {
1119 /* Let our parent know we succeeded. */
1120 pipe_write_block(2, SP_SUCCESS, NULL);
1123 i = 1; /* Interface id number */
1124 for (if_entry = g_list_first(if_list); if_entry != NULL;
1125 if_entry = g_list_next(if_entry)) {
1126 if_info = (if_info_t *)if_entry->data;
1127 printf("%d. %s", i++, if_info->name);
1130 * Print the contents of the if_entry struct in a parseable format.
1131 * Each if_entry element is tab-separated. Addresses are comma-
1134 /* XXX - Make sure our description doesn't contain a tab */
1135 if (if_info->description != NULL)
1136 printf("\t%s\t", if_info->description);
1140 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1141 addr = g_slist_next(addr)) {
1142 if (addr != g_slist_nth(if_info->addrs, 0))
1145 if_addr = (if_addr_t *)addr->data;
1146 switch(if_addr->ifat_type) {
1148 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1150 printf("%s", addr_str);
1152 printf("<unknown IPv4>");
1156 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1157 addr_str, ADDRSTRLEN)) {
1158 printf("%s", addr_str);
1160 printf("<unknown IPv6>");
1164 printf("<type unknown %u>", if_addr->ifat_type);
1168 if (if_info->loopback)
1169 printf("\tloopback");
1171 printf("\tnetwork");
1178 * If you change the machine-readable output format of this function,
1179 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1182 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1185 data_link_info_t *data_link_info;
1186 const gchar *desc_str;
1188 if (capture_child) {
1189 /* Let our parent know we succeeded. */
1190 pipe_write_block(2, SP_SUCCESS, NULL);
1193 if (caps->can_set_rfmon)
1197 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1198 lt_entry = g_list_next(lt_entry)) {
1199 data_link_info = (data_link_info_t *)lt_entry->data;
1200 if (data_link_info->description != NULL)
1201 desc_str = data_link_info->description;
1203 desc_str = "(not supported)";
1204 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1214 /* Print the number of packets captured for each interface until we're killed. */
1216 print_statistics_loop(gboolean machine_readable)
1218 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1224 char errbuf[PCAP_ERRBUF_SIZE];
1225 struct pcap_stat ps;
1227 if_list = get_interface_list(&err, &err_str);
1228 if (if_list == NULL) {
1230 case CANT_GET_INTERFACE_LIST:
1231 cmdarg_err("%s", err_str);
1235 case NO_INTERFACES_FOUND:
1236 cmdarg_err("There are no interfaces on which a capture can be done");
1242 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1243 if_info = (if_info_t *)if_entry->data;
1244 #ifdef HAVE_PCAP_OPEN
1245 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1247 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1251 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1252 if_stat->name = g_strdup(if_info->name);
1254 stat_list = g_list_append(stat_list, if_stat);
1259 cmdarg_err("There are no interfaces on which a capture can be done");
1263 if (capture_child) {
1264 /* Let our parent know we succeeded. */
1265 pipe_write_block(2, SP_SUCCESS, NULL);
1268 if (!machine_readable) {
1269 printf("%-15s %10s %10s\n", "Interface", "Received",
1273 global_ld.go = TRUE;
1274 while (global_ld.go) {
1275 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1276 if_stat = (if_stat_t *)stat_entry->data;
1277 pcap_stats(if_stat->pch, &ps);
1279 if (!machine_readable) {
1280 printf("%-15s %10u %10u\n", if_stat->name,
1281 ps.ps_recv, ps.ps_drop);
1283 printf("%s\t%u\t%u\n", if_stat->name,
1284 ps.ps_recv, ps.ps_drop);
1289 if (! global_ld.from_cap_pipe)
1296 /* XXX - Not reached. Should we look for 'q' in stdin? */
1297 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1298 if_stat = (if_stat_t *)stat_entry->data;
1299 pcap_close(if_stat->pch);
1300 g_free(if_stat->name);
1303 g_list_free(stat_list);
1304 free_interface_list(if_list);
1312 capture_cleanup_handler(DWORD dwCtrlType)
1314 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1315 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1316 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1317 like SIGTERM at least when the machine's shutting down.
1319 For now, if we're running as a command rather than a capture child,
1320 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1321 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1322 in that way on UN*X.
1324 If we're not running as a capture child, we might be running as
1325 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1326 user logs out. (XXX - can we explicitly check whether we're
1327 running as a service?) */
1329 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1330 "Console: Control signal");
1331 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1332 "Console: Control signal, CtrlType: %u", dwCtrlType);
1334 /* Keep capture running if we're a service and a user logs off */
1335 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1336 capture_loop_stop();
1344 capture_cleanup_handler(int signum _U_)
1346 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1347 SIGTERM. We assume that if the user wanted it to keep running
1348 after they logged out, they'd have nohupped it. */
1350 /* Note: don't call g_log() in the signal handler: if we happened to be in
1351 * g_log() in process context when the signal came in, g_log will detect
1352 * the "recursion" and abort.
1355 capture_loop_stop();
1361 report_capture_count(void)
1363 /* Don't print this if we're a capture child. */
1364 if (!capture_child) {
1366 /* Report the count only if we aren't printing a packet count
1367 as packets arrive. */
1368 fprintf(stderr, "Packets captured: %u\n", global_ld.packet_count);
1369 /* stderr could be line buffered */
1378 report_counts_for_siginfo(void)
1380 report_capture_count();
1381 infoprint = FALSE; /* we just reported it */
1385 report_counts_siginfo(int signum _U_)
1387 int sav_errno = errno;
1389 /* If we've been told to delay printing, just set a flag asking
1390 that we print counts (if we're supposed to), otherwise print
1391 the count of packets captured (if we're supposed to). */
1395 report_counts_for_siginfo();
1398 #endif /* SIGINFO */
1401 exit_main(int status)
1404 /* Shutdown windows sockets */
1407 /* can be helpful for debugging */
1408 #ifdef DEBUG_DUMPCAP
1409 printf("Press any key\n");
1420 * If we were linked with libcap (not libpcap), make sure we have
1421 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1422 * (See comment in main() for details)
1425 relinquish_privs_except_capture(void)
1427 /* If 'started_with_special_privs' (ie: suid) then enable for
1428 * ourself the NET_ADMIN and NET_RAW capabilities and then
1429 * drop our suid privileges.
1431 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1432 * stuff we don't need (and shouldn't have).
1433 * CAP_NET_RAW: Packet capture (raw sockets).
1436 if (started_with_special_privs()) {
1437 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1438 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1440 cap_t caps = cap_init(); /* all capabilities initialized to off */
1442 print_caps("Pre drop, pre set");
1444 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1445 cmdarg_err("prctl() fail return: %s", strerror(errno));
1448 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1449 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1451 if (cap_set_proc(caps)) {
1452 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1454 print_caps("Pre drop, post set");
1456 relinquish_special_privs_perm();
1458 print_caps("Post drop, pre set");
1459 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1460 if (cap_set_proc(caps)) {
1461 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1463 print_caps("Post drop, post set");
1469 #endif /* HAVE_LIBCAP */
1471 /* Take care of byte order in the libpcap headers read from pipes.
1472 * (function taken from wiretap/libpcap.c) */
1474 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1477 /* Byte-swap the record header fields. */
1478 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1479 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1480 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1481 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1484 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1485 swapped, in order to match the BPF header layout.
1487 Unfortunately, some files were, according to a comment in the "libpcap"
1488 source, written with version 2.3 in their headers but without the
1489 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1490 would make no sense - we assume that we need to swap them. */
1491 if (hdr->version_major == 2 &&
1492 (hdr->version_minor < 3 ||
1493 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1496 temp = rechdr->orig_len;
1497 rechdr->orig_len = rechdr->incl_len;
1498 rechdr->incl_len = temp;
1504 * Thread function that reads from a pipe and pushes the data
1505 * to the main application thread.
1508 * XXX Right now we use async queues for basic signaling. The main thread
1509 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1510 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1511 * Iff the read is successful cap_pipe_read pushes an item onto
1512 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1513 * the queues themselves (yet).
1515 * We might want to move some of the cap_pipe_dispatch logic here so that
1516 * we can let cap_pipe_read run independently, queuing up multiple reads
1517 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1519 static void *cap_pipe_read(void *ld_ptr)
1521 loop_data *ld = (loop_data *)ld_ptr;
1530 while (ld->cap_pipe_err == PIPOK) {
1531 g_async_queue_pop(cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1532 g_mutex_lock(cap_pipe_read_mtx);
1534 while (bytes_read < (int) ld->cap_pipe_bytes_to_read) {
1536 /* If we try to use read() on a named pipe on Windows with partial
1537 * data it appears to return EOF.
1539 res = ReadFile(ld->cap_pipe_h, ld->cap_pipe_buf+bytes_read,
1540 ld->cap_pipe_bytes_to_read - bytes_read,
1545 last_err = GetLastError();
1546 if (last_err == ERROR_MORE_DATA) {
1548 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1549 ld->cap_pipe_err = PIPEOF;
1553 ld->cap_pipe_err = PIPERR;
1556 } else if (b == 0 && ld->cap_pipe_bytes_to_read > 0) {
1557 ld->cap_pipe_err = PIPEOF;
1562 b = read(ld->cap_pipe_fd, ld->cap_pipe_buf+bytes_read,
1563 ld->cap_pipe_bytes_to_read - bytes_read);
1566 ld->cap_pipe_err = PIPEOF;
1570 ld->cap_pipe_err = PIPERR;
1579 ld->cap_pipe_bytes_read = bytes_read;
1580 if (ld->cap_pipe_bytes_read >= ld->cap_pipe_bytes_to_read) {
1581 g_async_queue_push(cap_pipe_done_q, ld->cap_pipe_buf); /* Any non-NULL value will do */
1583 g_mutex_unlock(cap_pipe_read_mtx);
1587 #endif /* USE_THREADS */
1589 /* Provide select() functionality for a single file descriptor
1590 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1592 * Returns the same values as select. If an error is returned,
1593 * the string cap_pipe_err_str should be used instead of errno.
1596 cap_pipe_select(int pipe_fd)
1599 struct timeval timeout;
1602 cap_pipe_err_str = "Unknown error";
1605 FD_SET(pipe_fd, &rfds);
1607 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1608 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1610 sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1612 cap_pipe_err_str = strerror(errno);
1617 /* Mimic pcap_open_live() for pipe captures
1619 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1620 * open it, and read the header.
1622 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1623 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1625 cap_pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
1626 char *errmsg, int errmsgl)
1629 ws_statb64 pipe_stat;
1630 struct sockaddr_un sa;
1633 unsigned int bytes_read;
1644 ld->cap_pipe_fd = -1;
1646 ld->cap_pipe_h = INVALID_HANDLE_VALUE;
1648 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1651 * XXX - this blocks until a pcap per-file header has been written to
1652 * the pipe, so it could block indefinitely.
1654 if (strcmp(pipename, "-") == 0) {
1656 fd = 0; /* read from stdin */
1658 ld->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1662 if (ws_stat64(pipename, &pipe_stat) < 0) {
1663 if (errno == ENOENT || errno == ENOTDIR)
1664 ld->cap_pipe_err = PIPNEXIST;
1666 g_snprintf(errmsg, errmsgl,
1667 "The capture session could not be initiated "
1668 "due to error getting information on pipe/socket: %s", strerror(errno));
1669 ld->cap_pipe_err = PIPERR;
1673 if (S_ISFIFO(pipe_stat.st_mode)) {
1674 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1676 g_snprintf(errmsg, errmsgl,
1677 "The capture session could not be initiated "
1678 "due to error on pipe open: %s", strerror(errno));
1679 ld->cap_pipe_err = PIPERR;
1682 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1683 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1685 g_snprintf(errmsg, errmsgl,
1686 "The capture session could not be initiated "
1687 "due to error on socket create: %s", strerror(errno));
1688 ld->cap_pipe_err = PIPERR;
1691 sa.sun_family = AF_UNIX;
1693 * The Single UNIX Specification says:
1695 * The size of sun_path has intentionally been left undefined.
1696 * This is because different implementations use different sizes.
1697 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1698 * of 104. Since most implementations originate from BSD versions,
1699 * the size is typically in the range 92 to 108.
1701 * Applications should not assume a particular length for sun_path
1702 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1706 * The <sys/un.h> header shall define the sockaddr_un structure,
1707 * which shall include at least the following members:
1709 * sa_family_t sun_family Address family.
1710 * char sun_path[] Socket pathname.
1712 * so we assume that it's an array, with a specified size,
1713 * and that the size reflects the maximum path length.
1715 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1716 /* Path name too long */
1717 g_snprintf(errmsg, errmsgl,
1718 "The capture session coud not be initiated "
1719 "due to error on socket connect: Path name too long");
1720 ld->cap_pipe_err = PIPERR;
1723 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1725 g_snprintf(errmsg, errmsgl,
1726 "The capture session coud not be initiated "
1727 "due to error on socket connect: %s", strerror(errno));
1728 ld->cap_pipe_err = PIPERR;
1732 if (S_ISCHR(pipe_stat.st_mode)) {
1734 * Assume the user specified an interface on a system where
1735 * interfaces are in /dev. Pretend we haven't seen it.
1737 ld->cap_pipe_err = PIPNEXIST;
1740 g_snprintf(errmsg, errmsgl,
1741 "The capture session could not be initiated because\n"
1742 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1743 ld->cap_pipe_err = PIPERR;
1748 #define PIPE_STR "\\pipe\\"
1749 /* Under Windows, named pipes _must_ have the form
1750 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1752 pncopy = g_strdup(pipename);
1753 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1754 pos = strchr(pncopy + 3, '\\');
1755 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1762 g_snprintf(errmsg, errmsgl,
1763 "The capture session could not be initiated because\n"
1764 "\"%s\" is neither an interface nor a pipe", pipename);
1765 ld->cap_pipe_err = PIPNEXIST;
1769 /* Wait for the pipe to appear */
1771 ld->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1772 OPEN_EXISTING, 0, NULL);
1774 if (ld->cap_pipe_h != INVALID_HANDLE_VALUE)
1777 if (GetLastError() != ERROR_PIPE_BUSY) {
1778 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1779 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1780 g_snprintf(errmsg, errmsgl,
1781 "The capture session on \"%s\" could not be started "
1782 "due to error on pipe open: %s (error %d)",
1783 pipename, utf_16to8(err_str), GetLastError());
1785 ld->cap_pipe_err = PIPERR;
1789 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1790 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1791 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1792 g_snprintf(errmsg, errmsgl,
1793 "The capture session on \"%s\" timed out during "
1794 "pipe open: %s (error %d)",
1795 pipename, utf_16to8(err_str), GetLastError());
1797 ld->cap_pipe_err = PIPERR;
1804 ld->from_cap_pipe = TRUE;
1807 /* read the pcap header */
1809 while (bytes_read < sizeof magic) {
1810 sel_ret = cap_pipe_select(fd);
1812 g_snprintf(errmsg, errmsgl,
1813 "Unexpected error from select: %s", strerror(errno));
1815 } else if (sel_ret > 0) {
1816 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1819 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1821 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1828 #else /* USE_THREADS */
1829 g_thread_create(&cap_pipe_read, ld, FALSE, NULL);
1831 ld->cap_pipe_buf = (char *) &magic;
1832 ld->cap_pipe_bytes_read = 0;
1833 ld->cap_pipe_bytes_to_read = sizeof(magic);
1834 /* We don't have to worry about cap_pipe_read_mtx here */
1835 g_async_queue_push(cap_pipe_pending_q, ld->cap_pipe_buf);
1836 g_async_queue_pop(cap_pipe_done_q);
1837 if (ld->cap_pipe_bytes_read <= 0) {
1838 if (ld->cap_pipe_bytes_read == 0)
1839 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1841 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1846 #endif /* USE_THREADS */
1850 /* Host that wrote it has our byte order, and was running
1851 a program using either standard or ss990417 libpcap. */
1852 ld->cap_pipe_byte_swapped = FALSE;
1853 ld->cap_pipe_modified = FALSE;
1855 case PCAP_MODIFIED_MAGIC:
1856 /* Host that wrote it has our byte order, but was running
1857 a program using either ss990915 or ss991029 libpcap. */
1858 ld->cap_pipe_byte_swapped = FALSE;
1859 ld->cap_pipe_modified = TRUE;
1861 case PCAP_SWAPPED_MAGIC:
1862 /* Host that wrote it has a byte order opposite to ours,
1863 and was running a program using either standard or
1864 ss990417 libpcap. */
1865 ld->cap_pipe_byte_swapped = TRUE;
1866 ld->cap_pipe_modified = FALSE;
1868 case PCAP_SWAPPED_MODIFIED_MAGIC:
1869 /* Host that wrote it out has a byte order opposite to
1870 ours, and was running a program using either ss990915
1871 or ss991029 libpcap. */
1872 ld->cap_pipe_byte_swapped = TRUE;
1873 ld->cap_pipe_modified = TRUE;
1876 /* Not a "libpcap" type we know about. */
1877 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1882 /* Read the rest of the header */
1884 while (bytes_read < sizeof(struct pcap_hdr)) {
1885 sel_ret = cap_pipe_select(fd);
1887 g_snprintf(errmsg, errmsgl,
1888 "Unexpected error from select: %s", strerror(errno));
1890 } else if (sel_ret > 0) {
1891 b = read(fd, ((char *)hdr)+bytes_read,
1892 sizeof(struct pcap_hdr) - bytes_read);
1895 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1897 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1904 #else /* USE_THREADS */
1905 ld->cap_pipe_buf = (char *) hdr;
1906 ld->cap_pipe_bytes_read = 0;
1907 ld->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1908 g_async_queue_push(cap_pipe_pending_q, ld->cap_pipe_buf);
1909 g_async_queue_pop(cap_pipe_done_q);
1910 if (ld->cap_pipe_bytes_read <= 0) {
1911 if (ld->cap_pipe_bytes_read == 0)
1912 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1914 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1918 #endif /* USE_THREADS */
1920 if (ld->cap_pipe_byte_swapped) {
1921 /* Byte-swap the header fields about which we care. */
1922 hdr->version_major = BSWAP16(hdr->version_major);
1923 hdr->version_minor = BSWAP16(hdr->version_minor);
1924 hdr->snaplen = BSWAP32(hdr->snaplen);
1925 hdr->network = BSWAP32(hdr->network);
1927 ld->linktype = hdr->network;
1929 if (hdr->version_major < 2) {
1930 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1934 ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
1935 ld->cap_pipe_err = PIPOK;
1937 ld->cap_pipe_fd = fd;
1942 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1943 ld->cap_pipe_err = PIPERR;
1946 ld->cap_pipe_fd = -1;
1953 /* We read one record from the pipe, take care of byte order in the record
1954 * header, write the record to the capture file, and update capture statistics. */
1956 cap_pipe_dispatch(loop_data *ld, guchar *data, char *errmsg, int errmsgl)
1958 struct pcap_pkthdr phdr;
1959 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1971 #ifdef LOG_CAPTURE_VERBOSE
1972 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
1975 switch (ld->cap_pipe_state) {
1977 case STATE_EXPECT_REC_HDR:
1979 if (g_mutex_trylock(cap_pipe_read_mtx)) {
1982 ld->cap_pipe_state = STATE_READ_REC_HDR;
1983 ld->cap_pipe_bytes_to_read = ld->cap_pipe_modified ?
1984 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
1985 ld->cap_pipe_bytes_read = 0;
1988 ld->cap_pipe_buf = (char *) &ld->cap_pipe_rechdr;
1989 g_async_queue_push(cap_pipe_pending_q, ld->cap_pipe_buf);
1990 g_mutex_unlock(cap_pipe_read_mtx);
1995 case STATE_READ_REC_HDR:
1997 b = read(ld->cap_pipe_fd, ((char *)&ld->cap_pipe_rechdr)+ld->cap_pipe_bytes_read,
1998 ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
2001 result = PD_PIPE_EOF;
2003 result = PD_PIPE_ERR;
2006 ld->cap_pipe_bytes_read += b;
2007 #else /* USE_THREADS */
2008 g_get_current_time(&wait_time);
2009 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2010 q_status = g_async_queue_timed_pop(cap_pipe_done_q, &wait_time);
2011 if (ld->cap_pipe_err == PIPEOF) {
2012 result = PD_PIPE_EOF;
2014 } else if (ld->cap_pipe_err == PIPERR) {
2015 result = PD_PIPE_ERR;
2021 #endif /* USE_THREADS */
2022 if ((ld->cap_pipe_bytes_read) < ld->cap_pipe_bytes_to_read)
2024 result = PD_REC_HDR_READ;
2027 case STATE_EXPECT_DATA:
2029 if (g_mutex_trylock(cap_pipe_read_mtx)) {
2032 ld->cap_pipe_state = STATE_READ_DATA;
2033 ld->cap_pipe_bytes_to_read = ld->cap_pipe_rechdr.hdr.incl_len;
2034 ld->cap_pipe_bytes_read = 0;
2037 ld->cap_pipe_buf = (char *) data;
2038 g_async_queue_push(cap_pipe_pending_q, ld->cap_pipe_buf);
2039 g_mutex_unlock(cap_pipe_read_mtx);
2044 case STATE_READ_DATA:
2046 b = read(ld->cap_pipe_fd, data+ld->cap_pipe_bytes_read,
2047 ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
2050 result = PD_PIPE_EOF;
2052 result = PD_PIPE_ERR;
2055 ld->cap_pipe_bytes_read += b;
2056 #else /* USE_THREADS */
2057 g_get_current_time(&wait_time);
2058 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2059 q_status = g_async_queue_timed_pop(cap_pipe_done_q, &wait_time);
2060 if (ld->cap_pipe_err == PIPEOF) {
2061 result = PD_PIPE_EOF;
2063 } else if (ld->cap_pipe_err == PIPERR) {
2064 result = PD_PIPE_ERR;
2070 #endif /* USE_THREADS */
2071 if ((ld->cap_pipe_bytes_read) < ld->cap_pipe_bytes_to_read)
2073 result = PD_DATA_READ;
2077 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2080 } /* switch (ld->cap_pipe_state) */
2083 * We've now read as much data as we were expecting, so process it.
2087 case PD_REC_HDR_READ:
2088 /* We've read the header. Take care of byte order. */
2089 cap_pipe_adjust_header(ld->cap_pipe_byte_swapped, &ld->cap_pipe_hdr,
2090 &ld->cap_pipe_rechdr.hdr);
2091 if (ld->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2092 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2093 ld->packet_count+1, ld->cap_pipe_rechdr.hdr.incl_len);
2096 ld->cap_pipe_state = STATE_EXPECT_DATA;
2100 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2101 phdr.ts.tv_sec = ld->cap_pipe_rechdr.hdr.ts_sec;
2102 phdr.ts.tv_usec = ld->cap_pipe_rechdr.hdr.ts_usec;
2103 phdr.caplen = ld->cap_pipe_rechdr.hdr.incl_len;
2104 phdr.len = ld->cap_pipe_rechdr.hdr.orig_len;
2106 capture_loop_packet_cb((u_char *)ld, &phdr, data);
2108 ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
2112 ld->cap_pipe_err = PIPEOF;
2117 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2118 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2119 g_snprintf(errmsg, errmsgl,
2120 "Error reading from pipe: %s (error %d)",
2121 utf_16to8(err_str), GetLastError());
2124 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2132 ld->cap_pipe_err = PIPERR;
2133 /* Return here rather than inside the switch to prevent GCC warning */
2138 /** Open the capture input file (pcap or capture pipe).
2139 * Returns TRUE if it succeeds, FALSE otherwise. */
2141 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2142 char *errmsg, size_t errmsg_len,
2143 char *secondary_errmsg, size_t secondary_errmsg_len)
2145 gchar open_err_str[PCAP_ERRBUF_SIZE];
2146 gchar *sync_msg_str;
2147 interface_options interface_opts;
2150 gchar *sync_secondary_msg_str;
2151 WORD wVersionRequested;
2155 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", capture_opts->iface);
2158 /* XXX - opening Winsock on tshark? */
2160 /* Initialize Windows Socket if we are in a WIN32 OS
2161 This needs to be done before querying the interface for network/netmask */
2163 /* XXX - do we really require 1.1 or earlier?
2164 Are there any versions that support only 2.0 or higher? */
2165 wVersionRequested = MAKEWORD(1, 1);
2166 err = WSAStartup(wVersionRequested, &wsaData);
2170 case WSASYSNOTREADY:
2171 g_snprintf(errmsg, (gulong) errmsg_len,
2172 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2175 case WSAVERNOTSUPPORTED:
2176 g_snprintf(errmsg, (gulong) errmsg_len,
2177 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2178 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2181 case WSAEINPROGRESS:
2182 g_snprintf(errmsg, (gulong) errmsg_len,
2183 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2187 g_snprintf(errmsg, (gulong) errmsg_len,
2188 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2192 g_snprintf(errmsg, (gulong) errmsg_len,
2193 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2197 g_snprintf(errmsg, (gulong) errmsg_len,
2198 "Couldn't initialize Windows Sockets: error %d", err);
2201 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2205 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2206 ld->pcap_h = open_capture_device(&interface_opts, capture_opts, &open_err_str);
2208 if (ld->pcap_h != NULL) {
2209 /* we've opened "iface" as a network device */
2211 /* try to set the capture buffer size */
2212 if (interface_opts.buffer_size > 1 &&
2213 pcap_setbuff(ld->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2214 sync_secondary_msg_str = g_strdup_printf(
2215 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2216 "the default of 1MB will be used.\n"
2218 "Nonetheless, the capture is started.\n",
2219 interface_opts.buffer_size);
2220 report_capture_error("Couldn't set the capture buffer size!",
2221 sync_secondary_msg_str);
2222 g_free(sync_secondary_msg_str);
2226 #if defined(HAVE_PCAP_REMOTE) && defined(HAVE_PCAP_SETSAMPLING)
2227 if ((capture_opts->sampling_method != CAPTURE_SAMP_NONE) &&
2228 (strncmp (interface_opts.name, "rpcap://", 8) == 0))
2230 struct pcap_samp *samp;
2232 if ((samp = pcap_setsampling(ld->pcap_h)) != NULL)
2234 switch (capture_opts->sampling_method)
2236 case CAPTURE_SAMP_BY_COUNT:
2237 samp->method = PCAP_SAMP_1_EVERY_N;
2240 case CAPTURE_SAMP_BY_TIMER:
2241 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2245 sync_msg_str = g_strdup_printf(
2246 "Unknown sampling method %d specified,\n"
2247 "continue without packet sampling",
2248 capture_opts->sampling_method);
2249 report_capture_error("Couldn't set the capture "
2250 "sampling", sync_msg_str);
2251 g_free(sync_msg_str);
2253 samp->value = capture_opts->sampling_param;
2257 report_capture_error("Couldn't set the capture sampling",
2258 "Cannot get packet sampling data structure");
2264 /* setting the data link type only works on real interfaces */
2265 if (!set_pcap_linktype(ld->pcap_h, capture_opts, errmsg, errmsg_len,
2266 secondary_errmsg, secondary_errmsg_len))
2268 ld->linktype = get_pcap_linktype(ld->pcap_h, interface_opts.name);
2270 /* We couldn't open "iface" as a network device. */
2271 /* Try to open it as a pipe */
2272 cap_pipe_open_live(interface_opts.name, &ld->cap_pipe_hdr, ld, errmsg, (int) errmsg_len);
2275 if (ld->cap_pipe_fd == -1)
2277 if (ld->cap_pipe_h == INVALID_HANDLE_VALUE)
2280 if (ld->cap_pipe_err == PIPNEXIST) {
2281 /* Pipe doesn't exist, so output message for interface */
2282 get_capture_device_open_failure_messages(open_err_str,
2283 interface_opts.name,
2287 secondary_errmsg_len);
2290 * Else pipe (or file) does exist and cap_pipe_open_live() has
2295 /* cap_pipe_open_live() succeeded; don't want
2296 error message from pcap_open_live() */
2297 open_err_str[0] = '\0';
2300 /* XXX - will this work for tshark? */
2301 #ifdef MUST_DO_SELECT
2302 if (!ld->from_cap_pipe) {
2303 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2304 ld->pcap_fd = pcap_get_selectable_fd(ld->pcap_h);
2306 ld->pcap_fd = pcap_fileno(ld->pcap_h);
2311 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2312 returned a warning; print it, but keep capturing. */
2313 if (open_err_str[0] != '\0') {
2314 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2315 report_capture_error(sync_msg_str, "");
2316 g_free(sync_msg_str);
2322 /* close the capture input file (pcap or capture pipe) */
2323 static void capture_loop_close_input(loop_data *ld)
2325 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2327 /* if open, close the capture pipe "input file" */
2329 if (ld->cap_pipe_fd >= 0) {
2330 g_assert(ld->from_cap_pipe);
2331 ws_close(ld->cap_pipe_fd);
2332 ld->cap_pipe_fd = 0;
2335 if (ld->cap_pipe_h != INVALID_HANDLE_VALUE) {
2336 CloseHandle(ld->cap_pipe_h);
2337 ld->cap_pipe_h = INVALID_HANDLE_VALUE;
2341 /* if open, close the pcap "input file" */
2342 if(ld->pcap_h != NULL) {
2343 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)ld->pcap_h);
2344 g_assert(!ld->from_cap_pipe);
2345 pcap_close(ld->pcap_h);
2352 /* Shut down windows sockets */
2358 /* init the capture filter */
2359 static initfilter_status_t
2360 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2361 gchar * name, gchar * cfilter)
2363 struct bpf_program fcode;
2365 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2367 /* capture filters only work on real interfaces */
2368 if (cfilter && !from_cap_pipe) {
2369 /* A capture filter was specified; set it up. */
2370 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2371 /* Treat this specially - our caller might try to compile this
2372 as a display filter and, if that succeeds, warn the user that
2373 the display and capture filter syntaxes are different. */
2374 return INITFILTER_BAD_FILTER;
2376 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2377 #ifdef HAVE_PCAP_FREECODE
2378 pcap_freecode(&fcode);
2380 return INITFILTER_OTHER_ERROR;
2382 #ifdef HAVE_PCAP_FREECODE
2383 pcap_freecode(&fcode);
2387 return INITFILTER_NO_ERROR;
2391 /* set up to write to the already-opened capture output file/files */
2393 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2397 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2400 if (ld->from_cap_pipe) {
2401 ld->file_snaplen = ld->cap_pipe_hdr.snaplen;
2404 ld->file_snaplen = pcap_snapshot(ld->pcap_h);
2407 /* Set up to write to the capture file. */
2408 if (capture_opts->multi_files_on) {
2409 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2411 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2414 gboolean successful;
2416 ld->bytes_written = 0;
2417 if (capture_opts->use_pcapng) {
2420 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2421 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err) &&
2422 libpcap_write_interface_description_block(ld->pdh, capture_opts->iface, capture_opts->cfilter, ld->linktype, ld->file_snaplen, &ld->bytes_written, &err);
2424 successful = libpcap_write_file_header(ld->pdh, ld->linktype, ld->file_snaplen,
2425 &ld->bytes_written, &err);
2433 if (ld->pdh == NULL) {
2434 /* We couldn't set up to write to the capture file. */
2435 /* XXX - use cf_open_error_message from tshark instead? */
2440 g_snprintf(errmsg, errmsg_len,
2441 "The file to which the capture would be"
2442 " saved (\"%s\") could not be opened: Error %d.",
2443 capture_opts->save_file, err);
2445 g_snprintf(errmsg, errmsg_len,
2446 "The file to which the capture would be"
2447 " saved (\"%s\") could not be opened: %s.",
2448 capture_opts->save_file, strerror(err));
2460 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2463 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2465 if (capture_opts->multi_files_on) {
2466 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2468 if (capture_opts->use_pcapng) {
2469 libpcap_write_interface_statistics_block(ld->pdh, 0, ld->pcap_h, &ld->bytes_written, err_close);
2471 return libpcap_dump_close(ld->pdh, err_close);
2475 /* dispatch incoming packets (pcap or capture pipe)
2477 * Waits for incoming packets to be available, and calls pcap_dispatch()
2478 * to cause them to be processed.
2480 * Returns the number of packets which were processed.
2482 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2483 * packet-batching behaviour does not cause packets to get held back
2487 capture_loop_dispatch(capture_options *capture_opts _U_, loop_data *ld,
2488 char *errmsg, int errmsg_len)
2491 gint packet_count_before;
2492 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2497 packet_count_before = ld->packet_count;
2498 if (ld->from_cap_pipe) {
2499 /* dispatch from capture pipe */
2500 #ifdef LOG_CAPTURE_VERBOSE
2501 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2504 sel_ret = cap_pipe_select(ld->cap_pipe_fd);
2506 if (sel_ret < 0 && errno != EINTR) {
2507 g_snprintf(errmsg, errmsg_len,
2508 "Unexpected error from select: %s", strerror(errno));
2509 report_capture_error(errmsg, please_report);
2514 * "select()" says we can read from the pipe without blocking
2516 #endif /* USE_THREADS */
2517 inpkts = cap_pipe_dispatch(ld, pcap_data, errmsg, errmsg_len);
2527 /* dispatch from pcap */
2528 #ifdef MUST_DO_SELECT
2530 * If we have "pcap_get_selectable_fd()", we use it to get the
2531 * descriptor on which to select; if that's -1, it means there
2532 * is no descriptor on which you can do a "select()" (perhaps
2533 * because you're capturing on a special device, and that device's
2534 * driver unfortunately doesn't support "select()", in which case
2535 * we don't do the select - which means it might not be possible
2536 * to stop a capture until a packet arrives. If that's unacceptable,
2537 * plead with whoever supplies the software for that device to add
2538 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2539 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2540 * later, so it can use pcap_breakloop().
2542 #ifdef LOG_CAPTURE_VERBOSE
2543 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2545 if (ld->pcap_fd != -1) {
2546 sel_ret = cap_pipe_select(ld->pcap_fd);
2549 * "select()" says we can read from it without blocking; go for
2552 * We don't have pcap_breakloop(), so we only process one packet
2553 * per pcap_dispatch() call, to allow a signal to stop the
2554 * processing immediately, rather than processing all packets
2555 * in a batch before quitting.
2557 inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb,
2561 /* Error, rather than pcap_breakloop(). */
2562 ld->pcap_err = TRUE;
2564 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2567 if (sel_ret < 0 && errno != EINTR) {
2568 g_snprintf(errmsg, errmsg_len,
2569 "Unexpected error from select: %s", strerror(errno));
2570 report_capture_error(errmsg, please_report);
2576 #endif /* MUST_DO_SELECT */
2578 /* dispatch from pcap without select */
2580 #ifdef LOG_CAPTURE_VERBOSE
2581 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2585 * On Windows, we don't support asynchronously telling a process to
2586 * stop capturing; instead, we check for an indication on a pipe
2587 * after processing packets. We therefore process only one packet
2588 * at a time, so that we can check the pipe after every packet.
2590 inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb, (u_char *) ld);
2592 inpkts = pcap_dispatch(ld->pcap_h, -1, capture_loop_packet_cb, (u_char *) ld);
2596 /* Error, rather than pcap_breakloop(). */
2597 ld->pcap_err = TRUE;
2599 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2601 #else /* pcap_next_ex */
2602 #ifdef LOG_CAPTURE_VERBOSE
2603 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2605 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2608 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2609 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2610 * This should be fixed in the WinPcap 4.0 alpha release.
2612 * For reference, an example remote interface:
2613 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2616 /* emulate dispatch from pcap */
2619 struct pcap_pkthdr *pkt_header;
2624 (in = pcap_next_ex(ld->pcap_h, &pkt_header, &pkt_data)) == 1)
2625 capture_loop_packet_cb( (u_char *) ld, pkt_header, pkt_data);
2628 ld->pcap_err = TRUE;
2632 #endif /* pcap_next_ex */
2636 #ifdef LOG_CAPTURE_VERBOSE
2637 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2640 return ld->packet_count - packet_count_before;
2644 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2645 * want to grab only the characters between the '{' and '}' delimiters.
2647 * Returns a GString that must be freed with g_string_free(). */
2649 isolate_uuid(const char *iface)
2654 ptr = strchr(iface, '{');
2656 return g_string_new(iface);
2657 gstr = g_string_new(ptr + 1);
2659 ptr = strchr(gstr->str, '}');
2663 gstr = g_string_truncate(gstr, ptr - gstr->str);
2668 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2669 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2671 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2672 char *errmsg, int errmsg_len)
2675 gchar *capfile_name;
2677 gboolean is_tempfile;
2679 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2680 (capture_opts->save_file) ? capture_opts->save_file : "");
2682 if (capture_opts->save_file != NULL) {
2683 /* We return to the caller while the capture is in progress.
2684 * Therefore we need to take a copy of save_file in
2685 * case the caller destroys it after we return.
2687 capfile_name = g_strdup(capture_opts->save_file);
2689 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2690 if (capture_opts->multi_files_on) {
2691 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2692 g_snprintf(errmsg, errmsg_len,
2693 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2694 g_free(capfile_name);
2697 if (strcmp(capfile_name, "-") == 0) {
2698 /* write to stdout */
2701 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2702 _setmode(1, O_BINARY);
2705 } /* if (...output_to_pipe ... */
2708 if (capture_opts->multi_files_on) {
2709 /* ringbuffer is enabled */
2710 *save_file_fd = ringbuf_init(capfile_name,
2711 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2712 capture_opts->group_read_access);
2714 /* we need the ringbuf name */
2715 if(*save_file_fd != -1) {
2716 g_free(capfile_name);
2717 capfile_name = g_strdup(ringbuf_current_filename());
2720 /* Try to open/create the specified file for use as a capture buffer. */
2721 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2722 (capture_opts->group_read_access) ? 0640 : 0600);
2725 is_tempfile = FALSE;
2727 /* Choose a random name for the temporary capture buffer */
2731 iface = isolate_uuid(capture_opts->iface);
2732 prefix = g_strconcat("wireshark_", g_basename(iface->str), NULL);
2733 g_string_free(iface, TRUE);
2735 prefix = g_strconcat("wireshark_", g_basename(capture_opts->iface), NULL);
2737 *save_file_fd = create_tempfile(&tmpname, prefix);
2739 capfile_name = g_strdup(tmpname);
2743 /* did we fail to open the output file? */
2744 if (*save_file_fd == -1) {
2746 g_snprintf(errmsg, errmsg_len,
2747 "The temporary file to which the capture would be saved (\"%s\") "
2748 "could not be opened: %s.", capfile_name, strerror(errno));
2750 if (capture_opts->multi_files_on) {
2751 ringbuf_error_cleanup();
2754 g_snprintf(errmsg, errmsg_len,
2755 "The file to which the capture would be saved (\"%s\") "
2756 "could not be opened: %s.", capfile_name,
2759 g_free(capfile_name);
2763 if(capture_opts->save_file != NULL) {
2764 g_free(capture_opts->save_file);
2766 capture_opts->save_file = capfile_name;
2767 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2768 "g_free(capfile_name)". */
2774 /* Do the work of handling either the file size or file duration capture
2775 conditions being reached, and switching files or stopping. */
2777 do_file_switch_or_stop(capture_options *capture_opts,
2778 condition *cnd_autostop_files,
2779 condition *cnd_autostop_size,
2780 condition *cnd_file_duration)
2782 if (capture_opts->multi_files_on) {
2783 if (cnd_autostop_files != NULL &&
2784 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2785 /* no files left: stop here */
2786 global_ld.go = FALSE;
2790 /* Switch to the next ringbuffer file */
2791 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2792 &global_ld.save_file_fd, &global_ld.err)) {
2793 gboolean successful;
2795 /* File switch succeeded: reset the conditions */
2796 global_ld.bytes_written = 0;
2797 if (capture_opts->use_pcapng) {
2800 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2801 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &global_ld.bytes_written, &global_ld.err) &&
2802 libpcap_write_interface_description_block(global_ld.pdh, capture_opts->iface, capture_opts->cfilter, global_ld.linktype, global_ld.file_snaplen, &global_ld.bytes_written, &global_ld.err);
2804 successful = libpcap_write_file_header(global_ld.pdh, global_ld.linktype, global_ld.file_snaplen,
2805 &global_ld.bytes_written, &global_ld.err);
2808 fclose(global_ld.pdh);
2809 global_ld.pdh = NULL;
2810 global_ld.go = FALSE;
2813 if(cnd_autostop_size)
2814 cnd_reset(cnd_autostop_size);
2815 if(cnd_file_duration)
2816 cnd_reset(cnd_file_duration);
2817 libpcap_dump_flush(global_ld.pdh, NULL);
2819 report_packet_count(global_ld.inpkts_to_sync_pipe);
2820 global_ld.inpkts_to_sync_pipe = 0;
2821 report_new_capture_file(capture_opts->save_file);
2823 /* File switch failed: stop here */
2824 global_ld.go = FALSE;
2828 /* single file, stop now */
2829 global_ld.go = FALSE;
2835 /* Do the low-level work of a capture.
2836 Returns TRUE if it succeeds, FALSE otherwise. */
2838 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
2841 time_t upd_time, cur_time;
2843 struct timeval upd_time, cur_time;
2847 condition *cnd_file_duration = NULL;
2848 condition *cnd_autostop_files = NULL;
2849 condition *cnd_autostop_size = NULL;
2850 condition *cnd_autostop_duration = NULL;
2853 gboolean cfilter_error = FALSE;
2854 char errmsg[MSG_MAX_LENGTH+1];
2855 char secondary_errmsg[MSG_MAX_LENGTH+1];
2858 *secondary_errmsg = '\0';
2860 /* init the loop data */
2861 global_ld.go = TRUE;
2862 global_ld.packet_count = 0;
2864 global_ld.report_packet_count = FALSE;
2866 if (capture_opts->has_autostop_packets)
2867 global_ld.packet_max = capture_opts->autostop_packets;
2869 global_ld.packet_max = 0; /* no limit */
2870 global_ld.inpkts_to_sync_pipe = 0;
2871 global_ld.err = 0; /* no error seen yet */
2872 global_ld.pcap_err = FALSE;
2873 global_ld.from_cap_pipe = FALSE;
2874 global_ld.pdh = NULL;
2876 global_ld.cap_pipe_fd = -1;
2878 global_ld.cap_pipe_h = INVALID_HANDLE_VALUE;
2880 #ifdef MUST_DO_SELECT
2881 global_ld.pcap_fd = 0;
2883 global_ld.autostop_files = 0;
2884 global_ld.save_file_fd = -1;
2886 /* We haven't yet gotten the capture statistics. */
2887 *stats_known = FALSE;
2889 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
2890 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
2892 /* open the "input file" from network interface or capture pipe */
2893 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
2894 secondary_errmsg, sizeof(secondary_errmsg))) {
2898 /* init the input filter from the network interface (capture pipe will do nothing) */
2899 switch (capture_loop_init_filter(global_ld.pcap_h, global_ld.from_cap_pipe,
2900 capture_opts->iface,
2901 capture_opts->cfilter)) {
2903 case INITFILTER_NO_ERROR:
2906 case INITFILTER_BAD_FILTER:
2907 cfilter_error = TRUE;
2908 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(global_ld.pcap_h));
2911 case INITFILTER_OTHER_ERROR:
2912 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
2913 pcap_geterr(global_ld.pcap_h));
2914 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
2918 /* If we're supposed to write to a capture file, open it for output
2919 (temporary/specified name/ringbuffer) */
2920 if (capture_opts->saving_to_file) {
2921 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
2922 errmsg, sizeof(errmsg))) {
2926 /* set up to write to the already-opened capture output file/files */
2927 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
2932 /* XXX - capture SIGTERM and close the capture, in case we're on a
2933 Linux 2.0[.x] system and you have to explicitly close the capture
2934 stream in order to turn promiscuous mode off? We need to do that
2935 in other places as well - and I don't think that works all the
2936 time in any case, due to libpcap bugs. */
2938 /* Well, we should be able to start capturing.
2940 Sync out the capture file, so the header makes it to the file system,
2941 and send a "capture started successfully and capture file created"
2942 message to our parent so that they'll open the capture file and
2943 update its windows to indicate that we have a live capture in
2945 libpcap_dump_flush(global_ld.pdh, NULL);
2946 report_new_capture_file(capture_opts->save_file);
2949 /* initialize capture stop (and alike) conditions */
2950 init_capture_stop_conditions();
2951 /* create stop conditions */
2952 if (capture_opts->has_autostop_filesize)
2954 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
2955 if (capture_opts->has_autostop_duration)
2956 cnd_autostop_duration =
2957 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
2959 if (capture_opts->multi_files_on) {
2960 if (capture_opts->has_file_duration)
2962 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
2964 if (capture_opts->has_autostop_files)
2965 cnd_autostop_files =
2966 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
2969 /* init the time values */
2971 upd_time = GetTickCount();
2973 gettimeofday(&upd_time, NULL);
2976 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
2978 /* WOW, everything is prepared! */
2979 /* please fasten your seat belts, we will enter now the actual capture loop */
2980 while (global_ld.go) {
2981 /* dispatch incoming packets */
2982 inpkts = capture_loop_dispatch(capture_opts, &global_ld, errmsg,
2986 /* Were we asked to print packet counts by the SIGINFO handler? */
2987 if (global_ld.report_packet_count) {
2988 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
2989 plurality(global_ld.packet_count, "", "s"));
2990 global_ld.report_packet_count = FALSE;
2995 /* any news from our parent (signal pipe)? -> just stop the capture */
2996 if (!signal_pipe_check_running()) {
2997 global_ld.go = FALSE;
3002 global_ld.inpkts_to_sync_pipe += inpkts;
3004 /* check capture size condition */
3005 if (cnd_autostop_size != NULL &&
3006 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3007 /* Capture size limit reached, do we have another file? */
3008 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3009 cnd_autostop_size, cnd_file_duration))
3011 } /* cnd_autostop_size */
3012 if (capture_opts->output_to_pipe) {
3013 libpcap_dump_flush(global_ld.pdh, NULL);
3017 /* Only update once every 500ms so as not to overload slow displays.
3018 * This also prevents too much context-switching between the dumpcap
3019 * and wireshark processes.
3021 #define DUMPCAP_UPD_TIME 500
3024 cur_time = GetTickCount();
3025 if ( (cur_time - upd_time) > DUMPCAP_UPD_TIME) {
3027 gettimeofday(&cur_time, NULL);
3028 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3029 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3032 upd_time = cur_time;
3035 if (pcap_stats(pch, stats) >= 0) {
3036 *stats_known = TRUE;
3039 /* Let the parent process know. */
3040 if (global_ld.inpkts_to_sync_pipe) {
3042 libpcap_dump_flush(global_ld.pdh, NULL);
3044 /* Send our parent a message saying we've written out
3045 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3047 report_packet_count(global_ld.inpkts_to_sync_pipe);
3049 global_ld.inpkts_to_sync_pipe = 0;
3052 /* check capture duration condition */
3053 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3054 /* The maximum capture time has elapsed; stop the capture. */
3055 global_ld.go = FALSE;
3059 /* check capture file duration condition */
3060 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3061 /* duration limit reached, do we have another file? */
3062 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3063 cnd_autostop_size, cnd_file_duration))
3065 } /* cnd_file_duration */
3068 } /* while (global_ld.go) */
3070 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3072 /* delete stop conditions */
3073 if (cnd_file_duration != NULL)
3074 cnd_delete(cnd_file_duration);
3075 if (cnd_autostop_files != NULL)
3076 cnd_delete(cnd_autostop_files);
3077 if (cnd_autostop_size != NULL)
3078 cnd_delete(cnd_autostop_size);
3079 if (cnd_autostop_duration != NULL)
3080 cnd_delete(cnd_autostop_duration);
3082 /* did we had a pcap (input) error? */
3083 if (global_ld.pcap_err) {
3084 /* On Linux, if an interface goes down while you're capturing on it,
3085 you'll get a "recvfrom: Network is down" or
3086 "The interface went down" error (ENETDOWN).
3087 (At least you will if strerror() doesn't show a local translation
3090 On FreeBSD and OS X, if a network adapter disappears while
3091 you're capturing on it, you'll get a "read: Device not configured"
3092 error (ENXIO). (See previous parenthetical note.)
3094 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3096 These should *not* be reported to the Wireshark developers. */
3099 cap_err_str = pcap_geterr(global_ld.pcap_h);
3100 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3101 strcmp(cap_err_str, "The interface went down") == 0 ||
3102 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3103 strcmp(cap_err_str, "read: I/O error") == 0 ||
3104 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3105 report_capture_error("The network adapter on which the capture was being done "
3106 "is no longer running; the capture has stopped.",
3109 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3111 report_capture_error(errmsg, please_report);
3114 else if (global_ld.from_cap_pipe && global_ld.cap_pipe_err == PIPERR)
3115 report_capture_error(errmsg, "");
3117 /* did we have an output error while capturing? */
3118 if (global_ld.err == 0) {
3121 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3122 global_ld.err, FALSE);
3123 report_capture_error(errmsg, please_report);
3127 if (capture_opts->saving_to_file) {
3128 /* close the output file */
3129 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3133 /* there might be packets not yet notified to the parent */
3134 /* (do this after closing the file, so all packets are already flushed) */
3135 if(global_ld.inpkts_to_sync_pipe) {
3137 report_packet_count(global_ld.inpkts_to_sync_pipe);
3138 global_ld.inpkts_to_sync_pipe = 0;
3141 /* If we've displayed a message about a write error, there's no point
3142 in displaying another message about an error on close. */
3143 if (!close_ok && write_ok) {
3144 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3146 report_capture_error(errmsg, "");
3150 * XXX We exhibit different behaviour between normal mode and sync mode
3151 * when the pipe is stdin and not already at EOF. If we're a child, the
3152 * parent's stdin isn't closed, so if the user starts another capture,
3153 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3154 * will say "Unrecognized libpcap format". On the other hand, in normal
3155 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3158 report_capture_count(); /* print final capture count only if (quiet && !capture_child) */
3160 /* get packet drop statistics from pcap */
3161 if(global_ld.pcap_h != NULL) {
3162 g_assert(!global_ld.from_cap_pipe);
3163 /* Get the capture statistics, so we know how many packets were
3165 if (pcap_stats(global_ld.pcap_h, stats) >= 0) {
3166 *stats_known = TRUE;
3167 /* Let the parent process know. */
3168 report_packet_drops(stats->ps_recv, stats->ps_drop, capture_opts->iface);
3170 g_snprintf(errmsg, sizeof(errmsg),
3171 "Can't get packet-drop statistics: %s",
3172 pcap_geterr(global_ld.pcap_h));
3173 report_capture_error(errmsg, please_report);
3177 /* close the input file (pcap or capture pipe) */
3178 capture_loop_close_input(&global_ld);
3180 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3182 /* ok, if the write and the close were successful. */
3183 return write_ok && close_ok;
3186 if (capture_opts->multi_files_on) {
3187 /* cleanup ringbuffer */
3188 ringbuf_error_cleanup();
3190 /* We can't use the save file, and we have no FILE * for the stream
3191 to close in order to close it, so close the FD directly. */
3192 if(global_ld.save_file_fd != -1) {
3193 ws_close(global_ld.save_file_fd);
3196 /* We couldn't even start the capture, so get rid of the capture
3198 if(capture_opts->save_file != NULL) {
3199 ws_unlink(capture_opts->save_file);
3200 g_free(capture_opts->save_file);
3203 capture_opts->save_file = NULL;
3205 report_cfilter_error(capture_opts->cfilter, errmsg);
3207 report_capture_error(errmsg, secondary_errmsg);
3209 /* close the input file (pcap or cap_pipe) */
3210 capture_loop_close_input(&global_ld);
3212 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3218 static void capture_loop_stop(void)
3220 #ifdef HAVE_PCAP_BREAKLOOP
3221 if(global_ld.pcap_h != NULL)
3222 pcap_breakloop(global_ld.pcap_h);
3224 global_ld.go = FALSE;
3229 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3230 int err, gboolean is_close)
3235 g_snprintf(errmsg, errmsglen,
3236 "Not all the packets could be written to the file"
3237 " to which the capture was being saved\n"
3238 "(\"%s\") because there is no space left on the file system\n"
3239 "on which that file resides.",
3245 g_snprintf(errmsg, errmsglen,
3246 "Not all the packets could be written to the file"
3247 " to which the capture was being saved\n"
3248 "(\"%s\") because you are too close to, or over,"
3249 " your disk quota\n"
3250 "on the file system on which that file resides.",
3257 g_snprintf(errmsg, errmsglen,
3258 "The file to which the capture was being saved\n"
3259 "(\"%s\") could not be closed: %s.",
3260 fname, strerror(err));
3262 g_snprintf(errmsg, errmsglen,
3263 "An error occurred while writing to the file"
3264 " to which the capture was being saved\n"
3266 fname, strerror(err));
3273 /* one packet was captured, process it */
3275 capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
3278 loop_data *ld = (loop_data *) (void *) user;
3281 /* We may be called multiple times from pcap_dispatch(); if we've set
3282 the "stop capturing" flag, ignore this packet, as we're not
3283 supposed to be saving any more packets. */
3288 gboolean successful;
3289 /* We're supposed to write the packet to a file; do so.
3290 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3291 "ld->err" to the error. */
3292 if (global_capture_opts.use_pcapng) {
3293 successful = libpcap_write_enhanced_packet_block(ld->pdh, phdr, 0, pd, &ld->bytes_written, &err);
3295 successful = libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err);
3302 /* if the user told us to stop after x packets, do we already have enough? */
3303 if ((ld->packet_max > 0) && (ld->packet_count >= ld->packet_max))
3312 /* And now our feature presentation... [ fade to music ] */
3314 main(int argc, char *argv[])
3317 gboolean arg_error = FALSE;
3324 struct sigaction action, oldaction;
3327 gboolean start_capture = TRUE;
3328 gboolean stats_known;
3329 struct pcap_stat stats;
3330 GLogLevelFlags log_flags;
3331 gboolean list_interfaces = FALSE;
3332 gboolean list_link_layer_types = FALSE;
3333 #ifdef HAVE_BPF_IMAGE
3334 gboolean print_bpf_code = FALSE;
3336 gboolean machine_readable = FALSE;
3337 gboolean print_statistics = FALSE;
3338 int status, run_once_args = 0;
3340 #if defined(__APPLE__) && defined(__LP64__)
3341 struct utsname osinfo;
3345 /* Convert our arg list to UTF-8. */
3346 wc_argv = CommandLineToArgvW(GetCommandLineW(), &wc_argc);
3347 if (wc_argv && wc_argc == argc) {
3348 for (i = 0; i < argc; i++) {
3349 argv[i] = g_utf16_to_utf8(wc_argv[i], -1, NULL, NULL, NULL);
3351 } /* XXX else bail because something is horribly, horribly wrong? */
3356 * Initialize our DLL search path. MUST be called before LoadLibrary
3359 ws_init_dll_search_path();
3362 #ifdef HAVE_PCAP_REMOTE
3363 #define OPTSTRING_A "A:"
3364 #define OPTSTRING_r "r"
3365 #define OPTSTRING_u "u"
3367 #define OPTSTRING_A ""
3368 #define OPTSTRING_r ""
3369 #define OPTSTRING_u ""
3372 #ifdef HAVE_PCAP_SETSAMPLING
3373 #define OPTSTRING_m "m:"
3375 #define OPTSTRING_m ""
3378 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3379 #define OPTSTRING_B "B:"
3381 #define OPTSTRING_B ""
3382 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3384 #ifdef HAVE_PCAP_CREATE
3385 #define OPTSTRING_I "I"
3387 #define OPTSTRING_I ""
3390 #ifdef HAVE_BPF_IMAGE
3391 #define OPTSTRING_d "d"
3393 #define OPTSTRING_d ""
3396 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "L" OPTSTRING_m "Mnpq" OPTSTRING_r "Ss:" OPTSTRING_u "vw:y:Z:"
3398 #ifdef DEBUG_CHILD_DUMPCAP
3399 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3400 fprintf (stderr, "Unable to open debug log file !\n");
3405 #if defined(__APPLE__) && defined(__LP64__)
3407 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3408 * a bug workaround - timeouts less than 1 second don't work with libpcap
3409 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3410 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3411 * The problem is extremely unlikely to be reintroduced in a future
3414 if (uname(&osinfo) == 0) {
3416 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3417 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3418 * number of 10.0.0, not 10.1.0 - go figure).
3420 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3421 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3422 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3423 need_timeout_workaround = TRUE;
3428 * Determine if dumpcap is being requested to run in a special
3429 * capture_child mode by going thru the command line args to see if
3430 * a -Z is present. (-Z is a hidden option).
3432 * The primary result of running in capture_child mode is that
3433 * all messages sent out on stderr are in a special type/len/string
3434 * format to allow message processing by type. These messages include
3435 * error messages if dumpcap fails to start the operation it was
3436 * requested to do, as well as various "status" messages which are sent
3437 * when an actual capture is in progress, and a "success" message sent
3438 * if dumpcap was requested to perform an operation other than a
3441 * Capture_child mode would normally be requested by a parent process
3442 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3443 * to which dumpcap stderr has been redirected. It might also have
3444 * another pipe to obtain dumpcap stdout output; for operations other
3445 * than a capture, that information is formatted specially for easier
3446 * parsing by the parent process.
3448 * Capture_child mode needs to be determined immediately upon
3449 * startup so that any messages generated by dumpcap in this mode
3450 * (eg: during initialization) will be formatted properly.
3453 for (i=1; i<argc; i++) {
3454 if (strcmp("-Z", argv[i]) == 0) {
3455 capture_child = TRUE;
3456 machine_readable = TRUE; /* request machine-readable output */
3458 /* set output pipe to binary mode, to avoid ugly text conversions */
3459 _setmode(2, O_BINARY);
3464 /* The default_log_handler will use stdout, which makes trouble in */
3465 /* capture child mode, as it uses stdout for it's sync_pipe. */
3466 /* So: the filtering is done in the console_log_handler and not here.*/
3467 /* We set the log handlers right up front to make sure that any log */
3468 /* messages when running as child will be sent back to the parent */
3469 /* with the correct format. */
3473 G_LOG_LEVEL_CRITICAL|
3474 G_LOG_LEVEL_WARNING|
3475 G_LOG_LEVEL_MESSAGE|
3478 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3480 g_log_set_handler(NULL,
3482 console_log_handler, NULL /* user_data */);
3483 g_log_set_handler(LOG_DOMAIN_MAIN,
3485 console_log_handler, NULL /* user_data */);
3486 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3488 console_log_handler, NULL /* user_data */);
3489 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3491 console_log_handler, NULL /* user_data */);
3493 /* Initialize the thread system */
3494 if (!g_thread_supported())
3495 g_thread_init(NULL);
3497 /* Load wpcap if possible. Do this before collecting the run-time version information */
3500 /* ... and also load the packet.dll from wpcap */
3501 /* XXX - currently not required, may change later. */
3502 /*wpcap_packet_load();*/
3504 /* Start windows sockets */
3505 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3507 /* Set handler for Ctrl+C key */
3508 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3510 /* Prepare to read from a pipe */
3511 cap_pipe_pending_q = g_async_queue_new();
3512 cap_pipe_done_q = g_async_queue_new();
3513 cap_pipe_read_mtx = g_mutex_new();
3516 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3518 action.sa_handler = capture_cleanup_handler;
3520 * Arrange that system calls not get restarted, because when
3521 * our signal handler returns we don't want to restart
3522 * a call that was waiting for packets to arrive.
3524 action.sa_flags = 0;
3525 sigemptyset(&action.sa_mask);
3526 sigaction(SIGTERM, &action, NULL);
3527 sigaction(SIGINT, &action, NULL);
3528 sigaction(SIGPIPE, &action, NULL);
3529 sigaction(SIGHUP, NULL, &oldaction);
3530 if (oldaction.sa_handler == SIG_DFL)
3531 sigaction(SIGHUP, &action, NULL);
3534 /* Catch SIGINFO and, if we get it and we're capturing in
3535 quiet mode, report the number of packets we've captured. */
3536 action.sa_handler = report_counts_siginfo;
3537 action.sa_flags = SA_RESTART;
3538 sigemptyset(&action.sa_mask);
3539 sigaction(SIGINFO, &action, NULL);
3540 #endif /* SIGINFO */
3543 /* ----------------------------------------------------------------- */
3544 /* Privilege and capability handling */
3546 /* 1. Running not as root or suid root; no special capabilities. */
3549 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3552 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3554 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3555 /* capabilities; Drop all other capabilities; */
3556 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3557 /* else: after pcap_open_live() in capture_loop_open_input() */
3558 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3559 /* (Note: this means that the process, although logged in */
3560 /* as root, does not have various permissions such as the */
3561 /* ability to bypass file access permissions). */
3562 /* XXX: Should we just leave capabilities alone in this case */
3563 /* so that user gets expected effect that root can do */
3566 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3568 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3569 /* else: after pcap_open_live() in capture_loop_open_input() */
3570 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3571 /* pcap_open_live). */
3573 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3575 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3576 /* capabilities; Drop all other capabilities; */
3577 /* Drop suid privileges (euid=ruid); */
3578 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3579 /* else: after pcap_open_live() in capture_loop_open_input() */
3580 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3582 /* XXX: For some Linux versions/distros with capabilities */
3583 /* a 'normal' process with any capabilities cannot be */
3584 /* 'killed' (signaled) from another (same uid) non-privileged */
3586 /* For example: If (non-suid) Wireshark forks a */
3587 /* child suid dumpcap which acts as described here (case 5), */
3588 /* Wireshark will be unable to kill (signal) the child */
3589 /* dumpcap process until the capabilities have been dropped */
3590 /* (after pcap_open_live()). */
3591 /* This behaviour will apparently be changed in the kernel */
3592 /* to allow the kill (signal) in this case. */
3593 /* See the following for details: */
3594 /* http://www.mail-archive.com/ [wrapped] */
3595 /* linux-security-module@vger.kernel.org/msg02913.html */
3597 /* It is therefore conceivable that if dumpcap somehow hangs */
3598 /* in pcap_open_live or before that wireshark will not */
3599 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3600 /* In this case, exiting wireshark will kill the child */
3601 /* dumpcap process. */
3603 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3604 /* capabilities; Using libcap. Note: capset cmd (which see) */
3605 /* used to assign capabilities to file. */
3607 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3608 /* else: after pcap_open_live() in capture_loop_open_input() */
3609 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3611 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3612 /* longer required (similar to capture). */
3614 /* ----------------------------------------------------------------- */
3616 init_process_policies();
3619 /* If 'started with special privileges' (and using libcap) */
3620 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3621 /* Set euid/egid = ruid/rgid to remove suid privileges */
3622 relinquish_privs_except_capture();
3625 /* Set the initial values in the capture options. This might be overwritten
3626 by the command line parameters. */
3627 capture_opts_init(&global_capture_opts, NULL);
3629 /* Default to capturing the entire packet. */
3630 global_capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
3632 /* We always save to a file - if no file was specified, we save to a
3634 global_capture_opts.saving_to_file = TRUE;
3635 global_capture_opts.has_ring_num_files = TRUE;
3637 /* Now get our args */
3638 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3640 case 'h': /* Print help and exit */
3644 case 'v': /* Show version and exit */
3646 GString *comp_info_str;
3647 GString *runtime_info_str;
3648 /* Assemble the compile-time version information string */
3649 comp_info_str = g_string_new("Compiled ");
3650 get_compiled_version_info(comp_info_str, NULL, NULL);
3652 /* Assemble the run-time version information string */
3653 runtime_info_str = g_string_new("Running ");
3654 get_runtime_version_info(runtime_info_str, NULL);
3655 show_version(comp_info_str, runtime_info_str);
3656 g_string_free(comp_info_str, TRUE);
3657 g_string_free(runtime_info_str, TRUE);
3661 /*** capture option specific ***/
3662 case 'a': /* autostop criteria */
3663 case 'b': /* Ringbuffer option */
3664 case 'c': /* Capture x packets */
3665 case 'f': /* capture filter */
3666 case 'i': /* Use interface x */
3667 case 'n': /* Use pcapng format */
3668 case 'p': /* Don't capture in promiscuous mode */
3669 case 's': /* Set the snapshot (capture) length */
3670 case 'w': /* Write to capture file x */
3671 case 'g': /* enable group read accesson file(s) */
3672 case 'y': /* Set the pcap data link type */
3673 #ifdef HAVE_PCAP_REMOTE
3674 case 'u': /* Use UDP for data transfer */
3675 case 'r': /* Capture own RPCAP traffic too */
3676 case 'A': /* Authentication */
3678 #ifdef HAVE_PCAP_SETSAMPLING
3679 case 'm': /* Sampling */
3681 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3682 case 'B': /* Buffer size */
3683 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3684 #ifdef HAVE_PCAP_CREATE
3685 case 'I': /* Monitor mode */
3687 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
3692 /*** hidden option: Wireshark child mode (using binary output messages) ***/
3694 capture_child = TRUE;
3696 /* set output pipe to binary mode, to avoid ugly text conversions */
3697 _setmode(2, O_BINARY);
3699 * optarg = the control ID, aka the PPID, currently used for the
3702 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
3703 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
3704 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
3705 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
3707 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
3708 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3709 "Signal pipe: Unable to open %s. Dead parent?",
3717 case 'q': /* Quiet */
3721 /*** all non capture option specific ***/
3722 case 'D': /* Print a list of capture devices and exit */
3723 list_interfaces = TRUE;
3726 case 'L': /* Print list of link-layer types and exit */
3727 list_link_layer_types = TRUE;
3730 #ifdef HAVE_BPF_IMAGE
3731 case 'd': /* Print BPF code for capture filter and exit */
3732 print_bpf_code = TRUE;
3736 case 'S': /* Print interface statistics once a second */
3737 print_statistics = TRUE;
3740 case 'M': /* For -D, -L, and -S, print machine-readable output */
3741 machine_readable = TRUE;
3744 case '?': /* Bad flag - print usage message */
3745 cmdarg_err("Invalid Option: %s", argv[optind-1]);
3753 /* user specified file name as regular command-line argument */
3754 /* XXX - use it as the capture file name (or something else)? */
3761 * Extra command line arguments were specified; complain.
3762 * XXX - interpret as capture filter, as tcpdump and tshark do?
3764 cmdarg_err("Invalid argument: %s", argv[0]);
3773 if (run_once_args > 1) {
3774 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
3776 } else if (run_once_args == 1) {
3777 /* We're supposed to print some information, rather than
3778 to capture traffic; did they specify a ring buffer option? */
3779 if (global_capture_opts.multi_files_on) {
3780 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
3784 /* We're supposed to capture traffic; was the ring buffer option
3785 specified and, if so, does it make sense? */
3786 if (global_capture_opts.multi_files_on) {
3787 /* Ring buffer works only under certain conditions:
3788 a) ring buffer does not work with temporary files;
3789 b) it makes no sense to enable the ring buffer if the maximum
3790 file size is set to "infinite". */
3791 if (global_capture_opts.save_file == NULL) {
3792 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
3793 global_capture_opts.multi_files_on = FALSE;
3795 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
3796 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
3798 /* XXX - this must be redesigned as the conditions changed */
3799 global_capture_opts.multi_files_on = FALSE;
3806 * "-D" requires no interface to be selected; it's supposed to list
3809 if (list_interfaces) {
3810 /* Get the list of interfaces */
3815 if_list = capture_interface_list(&err, &err_str);
3816 if (if_list == NULL) {
3818 case CANT_GET_INTERFACE_LIST:
3819 cmdarg_err("%s", err_str);
3824 case NO_INTERFACES_FOUND:
3826 * If we're being run by another program, just give them
3827 * an empty list of interfaces, don't report this as
3828 * an error; that lets them decide whether to report
3829 * this as an error or not.
3831 if (!machine_readable) {
3832 cmdarg_err("There are no interfaces on which a capture can be done");
3839 if (machine_readable) /* tab-separated values to stdout */
3840 print_machine_readable_interfaces(if_list);
3842 capture_opts_print_interfaces(if_list);
3843 free_interface_list(if_list);
3848 * "-S" requires no interface to be selected; it gives statistics
3849 * for all interfaces.
3851 if (print_statistics) {
3852 status = print_statistics_loop(machine_readable);
3857 * "-L", "-d", and capturing act on a particular interface, so we have to
3858 * have an interface; if none was specified, pick a default.
3860 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
3861 /* cmdarg_err() already called .... */
3865 /* Let the user know what interfaces were chosen. */
3866 /* get_interface_descriptive_name() is not available! */
3867 for (i = 0; i < global_capture_opts.number_of_ifaces; i++) {
3868 interface_options interface_opts;
3870 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
3871 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n", interface_opts.name);
3874 if (list_link_layer_types) {
3875 /* Get the list of link-layer types for the capture device. */
3876 if_capabilities_t *caps;
3880 for (i = 0; i < global_capture_opts.number_of_ifaces; i++) {
3881 interface_options interface_opts;
3883 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
3884 caps = get_if_capabilities(interface_opts.name,
3885 interface_opts.monitor_mode, &err_str);
3887 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
3888 "Please check to make sure you have sufficient permissions, and that\n"
3889 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
3893 if (caps->data_link_types == NULL) {
3894 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
3897 if (machine_readable) /* tab-separated values to stdout */
3898 /* XXX: We need to change the format and adopt consumers */
3899 print_machine_readable_if_capabilities(caps);
3901 /* XXX: We might want to print also the interface name */
3902 capture_opts_print_if_capabilities(caps, interface_opts.name,
3903 interface_opts.monitor_mode);
3904 free_if_capabilities(caps);
3909 /* We're supposed to do a capture, or print the BPF code for a filter.
3910 Process the snapshot length, as that affects the generated BPF code. */
3911 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
3913 #ifdef HAVE_BPF_IMAGE
3914 if (print_bpf_code) {
3915 show_filter_code(&global_capture_opts);
3920 /* We're supposed to do a capture. Process the ring buffer arguments. */
3921 capture_opts_trim_ring_num_files(&global_capture_opts);
3923 /* Now start the capture. */
3925 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
3929 /* capture failed */
3932 return 0; /* never here, make compiler happy */
3937 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
3938 const char *message, gpointer user_data _U_)
3945 /* ignore log message, if log_level isn't interesting */
3946 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
3947 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
3952 /* create a "timestamp" */
3954 today = localtime(&curr);
3956 switch(log_level & G_LOG_LEVEL_MASK) {
3957 case G_LOG_LEVEL_ERROR:
3960 case G_LOG_LEVEL_CRITICAL:
3963 case G_LOG_LEVEL_WARNING:
3966 case G_LOG_LEVEL_MESSAGE:
3969 case G_LOG_LEVEL_INFO:
3972 case G_LOG_LEVEL_DEBUG:
3976 fprintf(stderr, "unknown log_level %u\n", log_level);
3978 g_assert_not_reached();
3981 /* Generate the output message */
3982 if(log_level & G_LOG_LEVEL_MESSAGE) {
3983 /* normal user messages without additional infos */
3984 msg = g_strdup_printf("%s\n", message);
3986 /* info/debug messages with additional infos */
3987 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
3988 today->tm_hour, today->tm_min, today->tm_sec,
3989 log_domain != NULL ? log_domain : "",
3993 /* DEBUG & INFO msgs (if we're debugging today) */
3994 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
3995 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
3996 #ifdef DEBUG_DUMPCAP
3997 fprintf(stderr, "%s", msg);
4000 #ifdef DEBUG_CHILD_DUMPCAP
4001 fprintf(debug_log, "%s", msg);
4009 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4010 /* to parent especially formatted if dumpcap running as child. */
4011 if (capture_child) {
4012 sync_pipe_errmsg_to_parent(2, msg, "");
4014 fprintf(stderr, "%s", msg);
4021 /****************************************************************************************************************/
4022 /* indication report routines */
4026 report_packet_count(int packet_count)
4028 char tmp[SP_DECISIZE+1+1];
4029 static int count = 0;
4032 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4033 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4034 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4036 count += packet_count;
4037 fprintf(stderr, "\rPackets: %u ", count);
4038 /* stderr could be line buffered */
4044 report_new_capture_file(const char *filename)
4047 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4048 pipe_write_block(2, SP_FILE, filename);
4052 * Prevent a SIGINFO handler from writing to the standard error
4053 * while we're doing so; instead, have it just set a flag telling
4054 * us to print that information when we're done.
4057 #endif /* SIGINFO */
4058 fprintf(stderr, "File: %s\n", filename);
4059 /* stderr could be line buffered */
4064 * Allow SIGINFO handlers to write.
4069 * If a SIGINFO handler asked us to write out capture counts, do so.
4072 report_counts_for_siginfo();
4073 #endif /* SIGINFO */
4078 report_cfilter_error(const char *cfilter, const char *errmsg)
4080 if (capture_child) {
4081 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4082 pipe_write_block(2, SP_BAD_FILTER, errmsg);
4085 "Invalid capture filter: \"%s\"!\n"
4087 "That string isn't a valid capture filter (%s).\n"
4088 "See the User's Guide for a description of the capture filter syntax.\n",
4094 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4097 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4098 "Primary Error: %s", error_msg);
4099 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4100 "Secondary Error: %s", secondary_error_msg);
4101 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4103 fprintf(stderr, "%s\n", error_msg);
4104 if (secondary_error_msg[0] != '\0')
4105 fprintf(stderr, "%s\n", secondary_error_msg);
4110 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4112 char tmp1[SP_DECISIZE+1+1];
4113 char tmp2[SP_DECISIZE+1+1];
4115 g_snprintf(tmp1, sizeof(tmp1), "%u", received);
4116 g_snprintf(tmp2, sizeof(tmp2), "%u", drops);
4119 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets captured/dropped on interface %s: %s/%s", name, tmp1, tmp2);
4120 /* XXX: Need to provide interface id, changes to consumers required. */
4121 pipe_write_block(2, SP_DROPS, tmp2);
4123 fprintf(stderr, "Packets captured/dropped on interface %s: %s/%s\n", name, tmp1, tmp2);
4124 /* stderr could be line buffered */
4130 /****************************************************************************************************************/
4131 /* signal_pipe handling */
4136 signal_pipe_check_running(void)
4138 /* any news from our parent? -> just stop the capture */
4142 /* if we are running standalone, no check required */
4143 if(!capture_child) {
4147 if(!sig_pipe_name || !sig_pipe_handle) {
4148 /* This shouldn't happen */
4149 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4150 "Signal pipe: No name or handle");
4155 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4156 * at this point. Should we check to see if the parent is still alive,
4157 * e.g. by using OpenProcess?
4160 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4162 if(!result || avail > 0) {
4163 /* peek failed or some bytes really available */
4164 /* (if not piping from stdin this would fail) */
4165 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4166 "Signal pipe: Stop capture: %s", sig_pipe_name);
4167 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4168 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4169 sig_pipe_handle, result, avail);
4172 /* pipe ok and no bytes available */
4179 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4184 * indent-tabs-mode: nil
4187 * vi: set shiftwidth=4 tabstop=8 expandtab
4188 * :indentSize=4:tabSize=8:noTabs=true: