5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
65 #include "wsutil/wsgetopt.h"
73 # include <sys/prctl.h>
74 # include <sys/capability.h>
77 #include "ringbuffer.h"
78 #include "clopts_common.h"
79 #include "console_io.h"
80 #include "cmdarg_err.h"
81 #include "version_info.h"
83 #include "capture-pcap-util.h"
88 #include "capture-wpcap.h"
89 #include <wsutil/unicode-utils.h>
93 #include <sys/socket.h>
97 #ifdef NEED_INET_V6DEFS_H
98 # include "wsutil/inet_v6defs.h"
101 #include <wsutil/privileges.h>
103 #include "sync_pipe.h"
105 #include "capture_opts.h"
106 #include "capture_ifinfo.h"
107 #include "capture_sync.h"
109 #include "conditions.h"
110 #include "capture_stop_conditions.h"
112 #include "tempfile.h"
114 #include "wsutil/file_util.h"
117 * Get information about libpcap format from "wiretap/libpcap.h".
118 * XXX - can we just use pcap_open_offline() to read the pipe?
120 #include "wiretap/libpcap.h"
122 /**#define DEBUG_DUMPCAP**/
123 /**#define DEBUG_CHILD_DUMPCAP**/
125 #ifdef DEBUG_CHILD_DUMPCAP
126 FILE *debug_log; /* for logging debug messages to */
127 /* a file if DEBUG_CHILD_DUMPCAP */
135 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
137 static gchar *sig_pipe_name = NULL;
138 static HANDLE sig_pipe_handle = NULL;
139 static gboolean signal_pipe_check_running(void);
143 static GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
144 static GMutex *cap_pipe_read_mtx;
148 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
149 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
152 /** Stop a low-level capture (stops the capture child). */
153 static void capture_loop_stop(void);
155 #if !defined (__linux__)
156 #ifndef HAVE_PCAP_BREAKLOOP
158 * We don't have pcap_breakloop(), which is the only way to ensure that
159 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
160 * won't, if the call to read the next packet or batch of packets is
161 * is interrupted by a signal on UN*X, just go back and try again to
164 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
165 * the signal handler, set a flag to stop capturing; however, without
166 * a guarantee of that sort, we can't guarantee that we'll stop capturing
167 * if the read will be retried and won't time out if no packets arrive.
169 * Therefore, on at least some platforms, we work around the lack of
170 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
171 * to wait for packets to arrive, so that we're probably going to be
172 * blocked in the select() when the signal arrives, and can just bail
173 * out of the loop at that point.
175 * However, we don't want to that on BSD (because "select()" doesn't work
176 * correctly on BPF devices on at least some releases of some flavors of
177 * BSD), and we don't want to do it on Windows (because "select()" is
178 * something for sockets, not for arbitrary handles). (Note that "Windows"
179 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
180 * using WinPcap, not a UNIX libpcap.)
182 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
183 * on BSD times out even if no packets have arrived, so we'll eventually
184 * exit pcap_dispatch() with an indication that no packets have arrived,
185 * and will break out of the capture loop at that point.
187 * On Windows, we can't send a SIGINT to stop capturing, so none of this
188 * applies in any case.
190 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
191 * want to include it if it's not present on this platform, however.
193 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
194 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
196 # define MUST_DO_SELECT
197 # endif /* avoid select */
198 #endif /* HAVE_PCAP_BREAKLOOP */
200 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
201 * in pcap_dispatch(); on the other hand, select() works just fine there.
202 * Hence we use a select for that come what may.
204 #define MUST_DO_SELECT
207 /** init the capture filter */
210 INITFILTER_BAD_FILTER,
211 INITFILTER_OTHER_ERROR
212 } initfilter_status_t;
214 typedef struct _loop_data {
216 gboolean go; /* TRUE as long as we're supposed to keep capturing */
217 int err; /* if non-zero, error seen while capturing */
218 gint packet_count; /* Number of packets we have already captured */
219 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
220 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
222 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
225 /* pcap "input file" */
226 pcap_t *pcap_h; /* pcap handle */
227 gboolean pcap_err; /* TRUE if error from pcap */
228 #ifdef MUST_DO_SELECT
229 int pcap_fd; /* pcap file descriptor */
232 /* capture pipe (unix only "input file") */
233 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
234 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
235 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
237 HANDLE cap_pipe_h; /* The handle of the capture pipe */
239 int cap_pipe_fd; /* the file descriptor of the capture pipe */
241 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
242 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
244 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
245 #endif /* USE_THREADS */
246 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
247 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
249 STATE_EXPECT_REC_HDR,
254 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.
283 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
284 * 64-bit applications, with sub-second timeouts not to work. The bug is
287 #if defined(__APPLE__) && defined(__LP64__)
288 static gboolean need_timeout_workaround;
290 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
292 #define CAP_READ_TIMEOUT 250
296 * Timeout, in microseconds, for threaded reads from a pipe.
298 #define THREAD_READ_TIMEOUT 100
299 static const char *cap_pipe_err_str;
302 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
303 const char *message, gpointer user_data _U_);
305 /* capture related options */
306 static capture_options global_capture_opts;
307 static gboolean quiet;
309 static void capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
311 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
312 int err, gboolean is_close);
314 static void exit_main(int err) G_GNUC_NORETURN;
316 static void report_new_capture_file(const char *filename);
317 static void report_packet_count(int packet_count);
318 static void report_packet_drops(guint32 drops);
319 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
320 static void report_cfilter_error(const char *cfilter, const char *errmsg);
322 #define MSG_MAX_LENGTH 4096
325 print_usage(gboolean print_ver) {
333 "Dumpcap " VERSION "%s\n"
334 "Capture network packets and dump them into a libpcap file.\n"
335 "See http://www.wireshark.org for more information.\n",
336 wireshark_svnversion);
340 fprintf(output, "\nUsage: dumpcap [options] ...\n");
341 fprintf(output, "\n");
342 fprintf(output, "Capture interface:\n");
343 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
344 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
345 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
346 fprintf(output, " -p don't capture in promiscuous mode\n");
347 #ifdef HAVE_PCAP_CREATE
348 fprintf(output, " -I capture in monitor mode, if available\n");
350 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
351 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
353 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
354 fprintf(output, " -D print list of interfaces and exit\n");
355 fprintf(output, " -L print list of link-layer types of iface and exit\n");
356 #ifdef HAVE_BPF_IMAGE
357 fprintf(output, " -d print generated BPF code for capture filter\n");
359 fprintf(output, " -S print statistics for each interface once every second\n");
360 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
361 fprintf(output, "\n");
362 #ifdef HAVE_PCAP_REMOTE
363 fprintf(output, "\nRPCAP options:\n");
364 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
365 fprintf(output, " -u use UDP for RPCAP data transfer\n");
366 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
367 #ifdef HAVE_PCAP_SETSAMPLING
368 fprintf(output, " -m <sampling type> use packet sampling\n");
369 fprintf(output, " count:NUM - capture one packet of every NUM\n");
370 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
373 fprintf(output, "Stop conditions:\n");
374 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
375 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
376 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
377 fprintf(output, " files:NUM - stop after NUM files\n");
378 /*fprintf(output, "\n");*/
379 fprintf(output, "Output (files):\n");
380 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
381 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
382 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
383 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
384 fprintf(output, " -n use pcapng format instead of pcap\n");
385 /*fprintf(output, "\n");*/
386 fprintf(output, "Miscellaneous:\n");
387 fprintf(output, " -q don't report packet capture counts\n");
388 fprintf(output, " -v print version information and exit\n");
389 fprintf(output, " -h display this help and exit\n");
390 fprintf(output, "\n");
391 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
392 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
393 fprintf(output, "\n");
394 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
398 show_version(GString *comp_info_str, GString *runtime_info_str)
402 "Dumpcap " VERSION "%s\n"
407 "See http://www.wireshark.org for more information.\n",
408 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
412 * Print to the standard error. This is a command-line tool, so there's
413 * no need to pop up a console.
416 vfprintf_stderr(const char *fmt, va_list ap)
418 vfprintf(stderr, fmt, ap);
422 fprintf_stderr(const char *fmt, ...)
427 vfprintf_stderr(fmt, ap);
432 * Report an error in command-line arguments.
435 cmdarg_err(const char *fmt, ...)
441 /* Generate a 'special format' message back to parent */
443 msg = g_strdup_vprintf(fmt, ap);
444 sync_pipe_errmsg_to_parent(2, msg, "");
449 fprintf(stderr, "dumpcap: ");
450 vfprintf(stderr, fmt, ap);
451 fprintf(stderr, "\n");
457 * Report additional information for an error in command-line arguments.
460 cmdarg_err_cont(const char *fmt, ...)
467 msg = g_strdup_vprintf(fmt, ap);
468 sync_pipe_errmsg_to_parent(2, msg, "");
473 vfprintf(stderr, fmt, ap);
474 fprintf(stderr, "\n");
481 relinquish_all_capabilities(void)
483 /* Drop any and all capabilities this process may have. */
484 /* Allowed whether or not process has any privileges. */
485 cap_t caps = cap_init(); /* all capabilities initialized to off */
486 print_caps("Pre-clear");
487 if (cap_set_proc(caps)) {
488 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
490 print_caps("Post-clear");
496 open_capture_device(capture_options *capture_opts, char *open_err_str,
497 size_t open_err_str_size)
500 #ifdef HAVE_PCAP_CREATE
503 #ifdef HAVE_PCAP_REMOTE
504 struct pcap_rmtauth auth;
507 /* Open the network interface to capture from it.
508 Some versions of libpcap may put warnings into the error buffer
509 if they succeed; to tell if that's happened, we have to clear
510 the error buffer, and check if it's still a null string. */
511 open_err_str[0] = '\0';
512 #ifdef HAVE_PCAP_OPEN
514 * If we're opening a remote device, use pcap_open(); that's currently
515 * the only open routine that supports remote devices.
517 if (strncmp (capture_opts->iface, "rpcap://", 8) == 0) {
518 auth.type = capture_opts->auth_type == CAPTURE_AUTH_PWD ?
519 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
520 auth.username = capture_opts->auth_username;
521 auth.password = capture_opts->auth_password;
523 pcap_h = pcap_open(capture_opts->iface,
524 capture_opts->has_snaplen ? capture_opts->snaplen :
525 WTAP_MAX_PACKET_SIZE,
527 (capture_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
528 (capture_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
529 (capture_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
530 CAP_READ_TIMEOUT, &auth, open_err_str);
532 #endif /* HAVE_PCAP_OPEN */
535 * If we're not opening a remote device, use pcap_create() and
536 * pcap_activate() if we have them, so that we can set the buffer
537 * size, otherwise use pcap_open_live().
539 #ifdef HAVE_PCAP_CREATE
540 pcap_h = pcap_create(capture_opts->iface, open_err_str);
541 if (pcap_h != NULL) {
542 pcap_set_snaplen(pcap_h, capture_opts->has_snaplen ? capture_opts->snaplen : WTAP_MAX_PACKET_SIZE);
543 pcap_set_promisc(pcap_h, capture_opts->promisc_mode);
544 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
546 if (capture_opts->buffer_size > 1) {
547 pcap_set_buffer_size(pcap_h, capture_opts->buffer_size * 1024 * 1024);
549 if (capture_opts->monitor_mode)
550 pcap_set_rfmon(pcap_h, 1);
551 err = pcap_activate(pcap_h);
553 /* Failed to activate, set to NULL */
554 if (err == PCAP_ERROR)
555 g_strlcpy(open_err_str, pcap_geterr(pcap_h), open_err_str_size);
557 g_strlcpy(open_err_str, pcap_statustostr(err), open_err_str_size);
563 pcap_h = pcap_open_live(capture_opts->iface,
564 capture_opts->has_snaplen ? capture_opts->snaplen :
565 WTAP_MAX_PACKET_SIZE,
566 capture_opts->promisc_mode, CAP_READ_TIMEOUT,
571 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
572 /* to remove any suid privileges. */
573 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
574 /* (euid/egid have already previously been set to ruid/rgid. */
575 /* (See comment in main() for details) */
577 relinquish_special_privs_perm();
579 relinquish_all_capabilities();
586 get_capture_device_open_failure_messages(const char *open_err_str,
587 char *errmsg, size_t errmsg_len,
588 char *secondary_errmsg,
589 size_t secondary_errmsg_len)
591 const char *libpcap_warn;
592 static const char ppamsg[] = "can't find PPA for ";
594 /* If we got a "can't find PPA for X" message, warn the user (who
595 is running dumcap on HP-UX) that they don't have a version of
596 libpcap that properly handles HP-UX (libpcap 0.6.x and later
597 versions, which properly handle HP-UX, say "can't find /dev/dlpi
598 PPA for X" rather than "can't find PPA for X"). */
599 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
602 "You are running (T)Wireshark with a version of the libpcap library\n"
603 "that doesn't handle HP-UX network devices well; this means that\n"
604 "(T)Wireshark may not be able to capture packets.\n"
606 "To fix this, you should install libpcap 0.6.2, or a later version\n"
607 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
608 "packaged binary form from the Software Porting And Archive Centre\n"
609 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
610 "at the URL lists a number of mirror sites.";
613 g_snprintf(errmsg, (gulong) errmsg_len,
614 "The capture session could not be initiated (%s).", open_err_str);
616 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
617 "Please check to make sure you have sufficient permissions, and that you have "
618 "the proper interface or pipe specified.%s", libpcap_warn);
620 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
622 "Please check that \"%s\" is the proper interface.\n"
625 "Help can be found at:\n"
627 " http://wiki.wireshark.org/WinPcap\n"
628 " http://wiki.wireshark.org/CaptureSetup\n",
629 capture_opts->iface);
633 /* Set the data link type on a pcap. */
635 set_pcap_linktype(pcap_t *pcap_h, capture_options *capture_opts,
636 char *errmsg, size_t errmsg_len,
637 char *secondary_errmsg, size_t secondary_errmsg_len)
639 char *set_linktype_err_str;
641 if (capture_opts->linktype == -1)
642 return TRUE; /* just use the default */
643 #ifdef HAVE_PCAP_SET_DATALINK
644 if (pcap_set_datalink(pcap_h, capture_opts->linktype) == 0)
645 return TRUE; /* no error */
646 set_linktype_err_str = pcap_geterr(pcap_h);
648 /* Let them set it to the type it is; reject any other request. */
649 if (get_pcap_linktype(pcap_h, capture_opts->iface) == capture_opts->linktype)
650 return TRUE; /* no error */
651 set_linktype_err_str =
652 "That DLT isn't one of the DLTs supported by this device";
654 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
655 set_linktype_err_str);
657 * If the error isn't "XXX is not one of the DLTs supported by this device",
658 * tell the user to tell the Wireshark developers about it.
660 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
661 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
663 secondary_errmsg[0] = '\0';
668 compile_capture_filter(const char *iface, pcap_t *pcap_h,
669 struct bpf_program *fcode, const char *cfilter)
671 bpf_u_int32 netnum, netmask;
672 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
674 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
676 * Well, we can't get the netmask for this interface; it's used
677 * only for filters that check for broadcast IP addresses, so
678 * we just punt and use 0. It might be nice to warn the user,
679 * but that's a pain in a GUI application, as it'd involve popping
680 * up a message box, and it's not clear how often this would make
681 * a difference (only filters that check for IP broadcast addresses
685 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
688 if (pcap_compile(pcap_h, fcode, cfilter, 1, netmask) < 0)
694 show_filter_code(capture_options *capture_opts)
697 gchar open_err_str[PCAP_ERRBUF_SIZE];
698 char errmsg[MSG_MAX_LENGTH+1];
699 char secondary_errmsg[MSG_MAX_LENGTH+1];
700 struct bpf_program fcode;
701 struct bpf_insn *insn;
704 pcap_h = open_capture_device(capture_opts, open_err_str,
705 sizeof open_err_str);
706 if (pcap_h == NULL) {
707 /* Open failed; get messages */
708 get_capture_device_open_failure_messages(open_err_str,
709 errmsg, sizeof errmsg,
711 sizeof secondary_errmsg);
712 /* And report them */
713 report_capture_error(errmsg, secondary_errmsg);
717 /* Set the link-layer type. */
718 if (!set_pcap_linktype(pcap_h, capture_opts, errmsg, sizeof errmsg,
719 secondary_errmsg, sizeof secondary_errmsg)) {
721 report_capture_error(errmsg, secondary_errmsg);
725 /* OK, try to compile the capture filter. */
726 if (!compile_capture_filter(capture_opts->iface, pcap_h, &fcode,
727 capture_opts->cfilter)) {
729 report_cfilter_error(capture_opts->cfilter, errmsg);
735 /* Let our parent know we succeeded. */
736 pipe_write_block(2, SP_SUCCESS, NULL);
739 /* Now print the filter code. */
740 insn = fcode.bf_insns;
742 for (i = 0; i < fcode.bf_len; insn++, i++)
743 printf("%s\n", bpf_image(insn, i));
748 * capture_interface_list() is expected to do the right thing to get
749 * a list of interfaces.
751 * In most of the programs in the Wireshark suite, "the right thing"
752 * is to run dumpcap and ask it for the list, because dumpcap may
753 * be the only program in the suite with enough privileges to get
756 * In dumpcap itself, however, we obviously can't run dumpcap to
757 * ask for the list. Therefore, our capture_interface_list() should
758 * just call get_interface_list().
761 capture_interface_list(int *err, char **err_str)
763 return get_interface_list(err, err_str);
767 * Get the data-link type for a libpcap device.
768 * This works around AIX 5.x's non-standard and incompatible-with-the-
769 * rest-of-the-universe libpcap.
772 get_pcap_linktype(pcap_t *pch, const char *devname
780 const char *ifacename;
783 linktype = pcap_datalink(pch);
787 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
788 * rather than DLT_ values for link-layer types; the ifType values
789 * for LAN devices are:
796 * and the ifType value for a loopback device is 24.
798 * The AIX names for LAN devices begin with:
805 * and the AIX names for loopback devices begin with "lo".
807 * (The difference between "Ethernet" and "802.3" is presumably
808 * whether packets have an Ethernet header, with a packet type,
809 * or an 802.3 header, with a packet length, followed by an 802.2
810 * header and possibly a SNAP header.)
812 * If the device name matches "linktype" interpreted as an ifType
813 * value, rather than as a DLT_ value, we will assume this is AIX's
814 * non-standard, incompatible libpcap, rather than a standard libpcap,
815 * and will map the link-layer type to the standard DLT_ value for
816 * that link-layer type, as that's what the rest of Wireshark expects.
818 * (This means the capture files won't be readable by a tcpdump
819 * linked with AIX's non-standard libpcap, but so it goes. They
820 * *will* be readable by standard versions of tcpdump, Wireshark,
823 * XXX - if we conclude we're using AIX libpcap, should we also
824 * set a flag to cause us to assume the time stamps are in
825 * seconds-and-nanoseconds form, and to convert them to
826 * seconds-and-microseconds form before processing them and
831 * Find the last component of the device name, which is the
834 ifacename = strchr(devname, '/');
835 if (ifacename == NULL)
838 /* See if it matches any of the LAN device names. */
839 if (strncmp(ifacename, "en", 2) == 0) {
842 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
846 } else if (strncmp(ifacename, "et", 2) == 0) {
849 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
850 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
855 } else if (strncmp(ifacename, "tr", 2) == 0) {
858 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
859 * DLT_IEEE802, which is what's used for Token Ring.
863 } else if (strncmp(ifacename, "fi", 2) == 0) {
864 if (linktype == 15) {
866 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
870 } else if (strncmp(ifacename, "lo", 2) == 0) {
871 if (linktype == 24) {
873 * That's the RFC 1573 value for "software loopback" devices; map it
874 * to DLT_NULL, which is what's used for loopback devices on BSD.
884 static data_link_info_t *
885 create_data_link_info(int dlt)
887 data_link_info_t *data_link_info;
890 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
891 data_link_info->dlt = dlt;
892 text = pcap_datalink_val_to_name(dlt);
894 data_link_info->name = g_strdup(text);
896 data_link_info->name = g_strdup_printf("DLT %d", dlt);
897 text = pcap_datalink_val_to_description(dlt);
899 data_link_info->description = g_strdup(text);
901 data_link_info->description = NULL;
902 return data_link_info;
906 * Get the capabilities of a network device.
908 static if_capabilities_t *
909 get_if_capabilities(const char *devname, gboolean monitor_mode
910 #ifndef HAVE_PCAP_CREATE
915 if_capabilities_t *caps;
916 char errbuf[PCAP_ERRBUF_SIZE];
918 #ifdef HAVE_PCAP_CREATE
922 #ifdef HAVE_PCAP_LIST_DATALINKS
926 data_link_info_t *data_link_info;
929 * Allocate the interface capabilities structure.
931 caps = g_malloc(sizeof *caps);
933 #ifdef HAVE_PCAP_OPEN
934 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
935 caps->can_set_rfmon = FALSE;
938 *err_str = g_strdup(errbuf);
942 #elif defined(HAVE_PCAP_CREATE)
943 pch = pcap_create(devname, errbuf);
946 *err_str = g_strdup(errbuf);
950 status = pcap_can_set_rfmon(pch);
953 if (status == PCAP_ERROR)
954 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
957 *err_str = g_strdup(pcap_statustostr(status));
963 caps->can_set_rfmon = FALSE;
964 else if (status == 1) {
965 caps->can_set_rfmon = TRUE;
967 pcap_set_rfmon(pch, 1);
969 if (err_str != NULL) {
970 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
978 status = pcap_activate(pch);
980 /* Error. We ignore warnings (status > 0). */
981 if (err_str != NULL) {
982 if (status == PCAP_ERROR)
983 *err_str = g_strdup_printf("pcap_activate() failed: %s",
986 *err_str = g_strdup(pcap_statustostr(status));
993 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
994 caps->can_set_rfmon = FALSE;
997 *err_str = g_strdup(errbuf);
1002 deflt = get_pcap_linktype(pch, devname);
1003 #ifdef HAVE_PCAP_LIST_DATALINKS
1004 nlt = pcap_list_datalinks(pch, &linktypes);
1005 if (nlt == 0 || linktypes == NULL) {
1007 if (err_str != NULL)
1008 *err_str = NULL; /* an empty list doesn't mean an error */
1011 caps->data_link_types = NULL;
1012 for (i = 0; i < nlt; i++) {
1013 data_link_info = create_data_link_info(linktypes[i]);
1016 * XXX - for 802.11, make the most detailed 802.11
1017 * version the default, rather than the one the
1018 * device has as the default?
1020 if (linktypes[i] == deflt)
1021 caps->data_link_types = g_list_prepend(caps->data_link_types,
1024 caps->data_link_types = g_list_append(caps->data_link_types,
1027 #ifdef HAVE_PCAP_FREE_DATALINKS
1028 pcap_free_datalinks(linktypes);
1031 * In Windows, there's no guarantee that if you have a library
1032 * built with one version of the MSVC++ run-time library, and
1033 * it returns a pointer to allocated data, you can free that
1034 * data from a program linked with another version of the
1035 * MSVC++ run-time library.
1037 * This is not an issue on UN*X.
1039 * See the mail threads starting at
1041 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1045 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1048 #define xx_free free /* hack so checkAPIs doesn't complain */
1051 #endif /* HAVE_PCAP_FREE_DATALINKS */
1052 #else /* HAVE_PCAP_LIST_DATALINKS */
1054 data_link_info = create_data_link_info(deflt);
1055 caps->data_link_types = g_list_append(caps->data_link_types,
1057 #endif /* HAVE_PCAP_LIST_DATALINKS */
1061 if (err_str != NULL)
1066 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1068 print_machine_readable_interfaces(GList *if_list)
1075 char addr_str[ADDRSTRLEN];
1077 if (capture_child) {
1078 /* Let our parent know we succeeded. */
1079 pipe_write_block(2, SP_SUCCESS, NULL);
1082 i = 1; /* Interface id number */
1083 for (if_entry = g_list_first(if_list); if_entry != NULL;
1084 if_entry = g_list_next(if_entry)) {
1085 if_info = (if_info_t *)if_entry->data;
1086 printf("%d. %s", i++, if_info->name);
1089 * Print the contents of the if_entry struct in a parseable format.
1090 * Each if_entry element is tab-separated. Addresses are comma-
1093 /* XXX - Make sure our description doesn't contain a tab */
1094 if (if_info->description != NULL)
1095 printf("\t%s\t", if_info->description);
1099 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1100 addr = g_slist_next(addr)) {
1101 if (addr != g_slist_nth(if_info->addrs, 0))
1104 if_addr = (if_addr_t *)addr->data;
1105 switch(if_addr->ifat_type) {
1107 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1109 printf("%s", addr_str);
1111 printf("<unknown IPv4>");
1115 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1116 addr_str, ADDRSTRLEN)) {
1117 printf("%s", addr_str);
1119 printf("<unknown IPv6>");
1123 printf("<type unknown %u>", if_addr->ifat_type);
1127 if (if_info->loopback)
1128 printf("\tloopback");
1130 printf("\tnetwork");
1137 * If you change the machine-readable output format of this function,
1138 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1141 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1144 data_link_info_t *data_link_info;
1145 const gchar *desc_str;
1147 if (capture_child) {
1148 /* Let our parent know we succeeded. */
1149 pipe_write_block(2, SP_SUCCESS, NULL);
1152 if (caps->can_set_rfmon)
1156 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1157 lt_entry = g_list_next(lt_entry)) {
1158 data_link_info = (data_link_info_t *)lt_entry->data;
1159 if (data_link_info->description != NULL)
1160 desc_str = data_link_info->description;
1162 desc_str = "(not supported)";
1163 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1173 /* Print the number of packets captured for each interface until we're killed. */
1175 print_statistics_loop(gboolean machine_readable)
1177 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1183 char errbuf[PCAP_ERRBUF_SIZE];
1184 struct pcap_stat ps;
1186 if_list = get_interface_list(&err, &err_str);
1187 if (if_list == NULL) {
1189 case CANT_GET_INTERFACE_LIST:
1190 cmdarg_err("%s", err_str);
1194 case NO_INTERFACES_FOUND:
1195 cmdarg_err("There are no interfaces on which a capture can be done");
1201 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1202 if_info = (if_info_t *)if_entry->data;
1203 #ifdef HAVE_PCAP_OPEN
1204 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1206 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1210 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1211 if_stat->name = g_strdup(if_info->name);
1213 stat_list = g_list_append(stat_list, if_stat);
1218 cmdarg_err("There are no interfaces on which a capture can be done");
1222 if (capture_child) {
1223 /* Let our parent know we succeeded. */
1224 pipe_write_block(2, SP_SUCCESS, NULL);
1227 if (!machine_readable) {
1228 printf("%-15s %10s %10s\n", "Interface", "Received",
1232 global_ld.go = TRUE;
1233 while (global_ld.go) {
1234 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1235 if_stat = (if_stat_t *)stat_entry->data;
1236 pcap_stats(if_stat->pch, &ps);
1238 if (!machine_readable) {
1239 printf("%-15s %10u %10u\n", if_stat->name,
1240 ps.ps_recv, ps.ps_drop);
1242 printf("%s\t%u\t%u\n", if_stat->name,
1243 ps.ps_recv, ps.ps_drop);
1248 if (! global_ld.from_cap_pipe)
1255 /* XXX - Not reached. Should we look for 'q' in stdin? */
1256 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1257 if_stat = (if_stat_t *)stat_entry->data;
1258 pcap_close(if_stat->pch);
1259 g_free(if_stat->name);
1262 g_list_free(stat_list);
1263 free_interface_list(if_list);
1271 capture_cleanup_handler(DWORD dwCtrlType)
1273 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1274 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1275 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1276 like SIGTERM at least when the machine's shutting down.
1278 For now, if we're running as a command rather than a capture child,
1279 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1280 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1281 in that way on UN*X.
1283 If we're not running as a capture child, we might be running as
1284 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1285 user logs out. (XXX - can we explicitly check whether we're
1286 running as a service?) */
1288 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1289 "Console: Control signal");
1290 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1291 "Console: Control signal, CtrlType: %u", dwCtrlType);
1293 /* Keep capture running if we're a service and a user logs off */
1294 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1295 capture_loop_stop();
1303 capture_cleanup_handler(int signum _U_)
1305 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1306 SIGTERM. We assume that if the user wanted it to keep running
1307 after they logged out, they'd have nohupped it. */
1309 /* Note: don't call g_log() in the signal handler: if we happened to be in
1310 * g_log() in process context when the signal came in, g_log will detect
1311 * the "recursion" and abort.
1314 capture_loop_stop();
1323 /* Don't print this if we're a capture child. */
1324 if (!capture_child) {
1326 /* Report the count only if we aren't printing a packet count
1327 as packets arrive. */
1328 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
1329 plurality(global_ld.packet_count, "", "s"));
1332 infoprint = FALSE; /* we just reported it */
1336 report_counts_siginfo(int signum _U_)
1338 int sav_errno = errno;
1340 /* If we've been told to delay printing, just set a flag asking
1341 that we print counts (if we're supposed to), otherwise print
1342 the count of packets captured (if we're supposed to). */
1349 #endif /* SIGINFO */
1351 static void exit_main(int status)
1354 /* Shutdown windows sockets */
1357 /* can be helpful for debugging */
1358 #ifdef DEBUG_DUMPCAP
1359 printf("Press any key\n");
1370 * If we were linked with libcap (not libpcap), make sure we have
1371 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1372 * (See comment in main() for details)
1376 #if 0 /* Set to enable capability debugging */
1377 /* see 'man cap_to_text()' for explanation of output */
1378 /* '=' means 'all= ' ie: no capabilities */
1379 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
1381 print_caps(const char *pfx) {
1382 cap_t caps = cap_get_proc();
1383 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1384 "%s: EUID: %d Capabilities: %s", pfx,
1385 geteuid(), cap_to_text(caps, NULL));
1388 print_caps(const char *pfx _U_) {
1393 relinquish_privs_except_capture(void)
1395 /* If 'started_with_special_privs' (ie: suid) then enable for
1396 * ourself the NET_ADMIN and NET_RAW capabilities and then
1397 * drop our suid privileges.
1399 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1400 * stuff we don't need (and shouldn't have).
1401 * CAP_NET_RAW: Packet capture (raw sockets).
1404 if (started_with_special_privs()) {
1405 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1406 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1408 cap_t caps = cap_init(); /* all capabilities initialized to off */
1410 print_caps("Pre drop, pre set");
1412 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1413 cmdarg_err("prctl() fail return: %s", strerror(errno));
1416 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1417 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1419 if (cap_set_proc(caps)) {
1420 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1422 print_caps("Pre drop, post set");
1424 relinquish_special_privs_perm();
1426 print_caps("Post drop, pre set");
1427 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1428 if (cap_set_proc(caps)) {
1429 cmdarg_err("cap_set_proc() fail return: %s", strerror(errno));
1431 print_caps("Post drop, post set");
1437 #endif /* HAVE_LIBCAP */
1439 /* Take care of byte order in the libpcap headers read from pipes.
1440 * (function taken from wiretap/libpcap.c) */
1442 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1445 /* Byte-swap the record header fields. */
1446 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1447 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1448 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1449 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1452 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1453 swapped, in order to match the BPF header layout.
1455 Unfortunately, some files were, according to a comment in the "libpcap"
1456 source, written with version 2.3 in their headers but without the
1457 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1458 would make no sense - we assume that we need to swap them. */
1459 if (hdr->version_major == 2 &&
1460 (hdr->version_minor < 3 ||
1461 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1464 temp = rechdr->orig_len;
1465 rechdr->orig_len = rechdr->incl_len;
1466 rechdr->incl_len = temp;
1472 * Thread function that reads from a pipe and pushes the data
1473 * to the main application thread.
1476 * XXX Right now we use async queues for basic signaling. The main thread
1477 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1478 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1479 * Iff the read is successful cap_pipe_read pushes an item onto
1480 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1481 * the queues themselves (yet).
1483 * We might want to move some of the cap_pipe_dispatch logic here so that
1484 * we can let cap_pipe_read run independently, queuing up multiple reads
1485 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1487 static void *cap_pipe_read(void *ld_ptr) {
1488 loop_data *ld = (loop_data *)ld_ptr;
1497 while (ld->cap_pipe_err == PIPOK) {
1498 g_async_queue_pop(cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1499 g_mutex_lock(cap_pipe_read_mtx);
1501 while (bytes_read < (int) ld->cap_pipe_bytes_to_read) {
1503 /* If we try to use read() on a named pipe on Windows with partial
1504 * data it appears to return EOF.
1506 res = ReadFile(ld->cap_pipe_h, ld->cap_pipe_buf+bytes_read,
1507 ld->cap_pipe_bytes_to_read - bytes_read,
1512 last_err = GetLastError();
1513 if (last_err == ERROR_MORE_DATA) {
1515 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1516 ld->cap_pipe_err = PIPEOF;
1520 ld->cap_pipe_err = PIPERR;
1523 } else if (b == 0 && ld->cap_pipe_bytes_to_read > 0) {
1524 ld->cap_pipe_err = PIPEOF;
1529 b = read(ld->cap_pipe_fd, ld->cap_pipe_buf+bytes_read,
1530 ld->cap_pipe_bytes_to_read - bytes_read);
1533 ld->cap_pipe_err = PIPEOF;
1537 ld->cap_pipe_err = PIPERR;
1546 ld->cap_pipe_bytes_read = bytes_read;
1547 if (ld->cap_pipe_bytes_read >= ld->cap_pipe_bytes_to_read) {
1548 g_async_queue_push(cap_pipe_done_q, ld->cap_pipe_buf); /* Any non-NULL value will do */
1550 g_mutex_unlock(cap_pipe_read_mtx);
1554 #endif /* USE_THREADS */
1556 /* Provide select() functionality for a single file descriptor
1557 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1559 * Returns the same values as select. If an error is returned,
1560 * the string cap_pipe_err_str should be used instead of errno.
1563 cap_pipe_select(int pipe_fd) {
1565 struct timeval timeout, *pto;
1568 cap_pipe_err_str = "Unknown error";
1571 FD_SET(pipe_fd, &rfds);
1574 timeout.tv_usec = CAP_READ_TIMEOUT * 1000;
1577 sel_ret = select(pipe_fd+1, &rfds, NULL, NULL, pto);
1579 cap_pipe_err_str = strerror(errno);
1584 /* Mimic pcap_open_live() for pipe captures
1586 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1587 * open it, and read the header.
1589 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1590 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1592 cap_pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
1593 char *errmsg, int errmsgl)
1596 struct stat pipe_stat;
1597 struct sockaddr_un sa;
1600 unsigned int bytes_read;
1611 ld->cap_pipe_fd = -1;
1613 ld->cap_pipe_h = INVALID_HANDLE_VALUE;
1615 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1618 * XXX - this blocks until a pcap per-file header has been written to
1619 * the pipe, so it could block indefinitely.
1621 if (strcmp(pipename, "-") == 0) {
1623 fd = 0; /* read from stdin */
1625 ld->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1629 if (ws_stat(pipename, &pipe_stat) < 0) {
1630 if (errno == ENOENT || errno == ENOTDIR)
1631 ld->cap_pipe_err = PIPNEXIST;
1633 g_snprintf(errmsg, errmsgl,
1634 "The capture session could not be initiated "
1635 "due to error getting information on pipe/socket: %s", strerror(errno));
1636 ld->cap_pipe_err = PIPERR;
1640 if (S_ISFIFO(pipe_stat.st_mode)) {
1641 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1643 g_snprintf(errmsg, errmsgl,
1644 "The capture session could not be initiated "
1645 "due to error on pipe open: %s", strerror(errno));
1646 ld->cap_pipe_err = PIPERR;
1649 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1650 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1652 g_snprintf(errmsg, errmsgl,
1653 "The capture session could not be initiated "
1654 "due to error on socket create: %s", strerror(errno));
1655 ld->cap_pipe_err = PIPERR;
1658 sa.sun_family = AF_UNIX;
1660 * The Single UNIX Specification says:
1662 * The size of sun_path has intentionally been left undefined.
1663 * This is because different implementations use different sizes.
1664 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1665 * of 104. Since most implementations originate from BSD versions,
1666 * the size is typically in the range 92 to 108.
1668 * Applications should not assume a particular length for sun_path
1669 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1673 * The <sys/un.h> header shall define the sockaddr_un structure,
1674 * which shall include at least the following members:
1676 * sa_family_t sun_family Address family.
1677 * char sun_path[] Socket pathname.
1679 * so we assume that it's an array, with a specified size,
1680 * and that the size reflects the maximum path length.
1682 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1683 /* Path name too long */
1684 g_snprintf(errmsg, errmsgl,
1685 "The capture session coud not be initiated "
1686 "due to error on socket connect: Path name too long");
1687 ld->cap_pipe_err = PIPERR;
1690 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1692 g_snprintf(errmsg, errmsgl,
1693 "The capture session coud not be initiated "
1694 "due to error on socket connect: %s", strerror(errno));
1695 ld->cap_pipe_err = PIPERR;
1699 if (S_ISCHR(pipe_stat.st_mode)) {
1701 * Assume the user specified an interface on a system where
1702 * interfaces are in /dev. Pretend we haven't seen it.
1704 ld->cap_pipe_err = PIPNEXIST;
1707 g_snprintf(errmsg, errmsgl,
1708 "The capture session could not be initiated because\n"
1709 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1710 ld->cap_pipe_err = PIPERR;
1715 #define PIPE_STR "\\pipe\\"
1716 /* Under Windows, named pipes _must_ have the form
1717 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1719 pncopy = g_strdup(pipename);
1720 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1721 pos = strchr(pncopy + 3, '\\');
1722 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1729 g_snprintf(errmsg, errmsgl,
1730 "The capture session could not be initiated because\n"
1731 "\"%s\" is neither an interface nor a pipe", pipename);
1732 ld->cap_pipe_err = PIPNEXIST;
1736 /* Wait for the pipe to appear */
1738 ld->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1739 OPEN_EXISTING, 0, NULL);
1741 if (ld->cap_pipe_h != INVALID_HANDLE_VALUE)
1744 if (GetLastError() != ERROR_PIPE_BUSY) {
1745 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1746 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1747 g_snprintf(errmsg, errmsgl,
1748 "The capture session on \"%s\" could not be started "
1749 "due to error on pipe open: %s (error %d)",
1750 pipename, utf_16to8(err_str), GetLastError());
1752 ld->cap_pipe_err = PIPERR;
1756 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1757 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1758 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1759 g_snprintf(errmsg, errmsgl,
1760 "The capture session on \"%s\" timed out during "
1761 "pipe open: %s (error %d)",
1762 pipename, utf_16to8(err_str), GetLastError());
1764 ld->cap_pipe_err = PIPERR;
1771 ld->from_cap_pipe = TRUE;
1774 /* read the pcap header */
1776 while (bytes_read < sizeof magic) {
1777 sel_ret = cap_pipe_select(fd);
1779 g_snprintf(errmsg, errmsgl,
1780 "Unexpected error from select: %s", strerror(errno));
1782 } else if (sel_ret > 0) {
1783 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1786 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1788 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1795 #else /* USE_THREADS */
1796 g_thread_create(&cap_pipe_read, ld, FALSE, NULL);
1798 ld->cap_pipe_buf = (char *) &magic;
1799 ld->cap_pipe_bytes_read = 0;
1800 ld->cap_pipe_bytes_to_read = sizeof(magic);
1801 /* We don't have to worry about cap_pipe_read_mtx here */
1802 g_async_queue_push(cap_pipe_pending_q, ld->cap_pipe_buf);
1803 g_async_queue_pop(cap_pipe_done_q);
1804 if (ld->cap_pipe_bytes_read <= 0) {
1805 if (ld->cap_pipe_bytes_read == 0)
1806 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1808 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1813 #endif /* USE_THREADS */
1817 /* Host that wrote it has our byte order, and was running
1818 a program using either standard or ss990417 libpcap. */
1819 ld->cap_pipe_byte_swapped = FALSE;
1820 ld->cap_pipe_modified = FALSE;
1822 case PCAP_MODIFIED_MAGIC:
1823 /* Host that wrote it has our byte order, but was running
1824 a program using either ss990915 or ss991029 libpcap. */
1825 ld->cap_pipe_byte_swapped = FALSE;
1826 ld->cap_pipe_modified = TRUE;
1828 case PCAP_SWAPPED_MAGIC:
1829 /* Host that wrote it has a byte order opposite to ours,
1830 and was running a program using either standard or
1831 ss990417 libpcap. */
1832 ld->cap_pipe_byte_swapped = TRUE;
1833 ld->cap_pipe_modified = FALSE;
1835 case PCAP_SWAPPED_MODIFIED_MAGIC:
1836 /* Host that wrote it out has a byte order opposite to
1837 ours, and was running a program using either ss990915
1838 or ss991029 libpcap. */
1839 ld->cap_pipe_byte_swapped = TRUE;
1840 ld->cap_pipe_modified = TRUE;
1843 /* Not a "libpcap" type we know about. */
1844 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1849 /* Read the rest of the header */
1851 while (bytes_read < sizeof(struct pcap_hdr)) {
1852 sel_ret = cap_pipe_select(fd);
1854 g_snprintf(errmsg, errmsgl,
1855 "Unexpected error from select: %s", strerror(errno));
1857 } else if (sel_ret > 0) {
1858 b = read(fd, ((char *)hdr)+bytes_read,
1859 sizeof(struct pcap_hdr) - bytes_read);
1862 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1864 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1871 #else /* USE_THREADS */
1872 ld->cap_pipe_buf = (char *) hdr;
1873 ld->cap_pipe_bytes_read = 0;
1874 ld->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1875 g_async_queue_push(cap_pipe_pending_q, ld->cap_pipe_buf);
1876 g_async_queue_pop(cap_pipe_done_q);
1877 if (ld->cap_pipe_bytes_read <= 0) {
1878 if (ld->cap_pipe_bytes_read == 0)
1879 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1881 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1885 #endif /* USE_THREADS */
1887 if (ld->cap_pipe_byte_swapped) {
1888 /* Byte-swap the header fields about which we care. */
1889 hdr->version_major = BSWAP16(hdr->version_major);
1890 hdr->version_minor = BSWAP16(hdr->version_minor);
1891 hdr->snaplen = BSWAP32(hdr->snaplen);
1892 hdr->network = BSWAP32(hdr->network);
1894 ld->linktype = hdr->network;
1896 if (hdr->version_major < 2) {
1897 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1901 ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
1902 ld->cap_pipe_err = PIPOK;
1904 ld->cap_pipe_fd = fd;
1909 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1910 ld->cap_pipe_err = PIPERR;
1913 ld->cap_pipe_fd = -1;
1920 /* We read one record from the pipe, take care of byte order in the record
1921 * header, write the record to the capture file, and update capture statistics. */
1923 cap_pipe_dispatch(loop_data *ld, guchar *data, char *errmsg, int errmsgl)
1925 struct pcap_pkthdr phdr;
1926 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1938 #ifdef LOG_CAPTURE_VERBOSE
1939 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
1942 switch (ld->cap_pipe_state) {
1944 case STATE_EXPECT_REC_HDR:
1946 if (g_mutex_trylock(cap_pipe_read_mtx)) {
1949 ld->cap_pipe_state = STATE_READ_REC_HDR;
1950 ld->cap_pipe_bytes_to_read = ld->cap_pipe_modified ?
1951 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
1952 ld->cap_pipe_bytes_read = 0;
1955 ld->cap_pipe_buf = (char *) &ld->cap_pipe_rechdr;
1956 g_async_queue_push(cap_pipe_pending_q, ld->cap_pipe_buf);
1957 g_mutex_unlock(cap_pipe_read_mtx);
1962 case STATE_READ_REC_HDR:
1964 b = read(ld->cap_pipe_fd, ((char *)&ld->cap_pipe_rechdr)+ld->cap_pipe_bytes_read,
1965 ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
1968 result = PD_PIPE_EOF;
1970 result = PD_PIPE_ERR;
1973 ld->cap_pipe_bytes_read += b;
1974 #else /* USE_THREADS */
1975 g_get_current_time(&wait_time);
1976 g_time_val_add(&wait_time, THREAD_READ_TIMEOUT);
1977 q_status = g_async_queue_timed_pop(cap_pipe_done_q, &wait_time);
1978 if (ld->cap_pipe_err == PIPEOF) {
1979 result = PD_PIPE_EOF;
1981 } else if (ld->cap_pipe_err == PIPERR) {
1982 result = PD_PIPE_ERR;
1988 #endif /* USE_THREADS */
1989 if ((ld->cap_pipe_bytes_read) < ld->cap_pipe_bytes_to_read)
1991 result = PD_REC_HDR_READ;
1994 case STATE_EXPECT_DATA:
1996 if (g_mutex_trylock(cap_pipe_read_mtx)) {
1999 ld->cap_pipe_state = STATE_READ_DATA;
2000 ld->cap_pipe_bytes_to_read = ld->cap_pipe_rechdr.hdr.incl_len;
2001 ld->cap_pipe_bytes_read = 0;
2004 ld->cap_pipe_buf = (char *) data;
2005 g_async_queue_push(cap_pipe_pending_q, ld->cap_pipe_buf);
2006 g_mutex_unlock(cap_pipe_read_mtx);
2011 case STATE_READ_DATA:
2013 b = read(ld->cap_pipe_fd, data+ld->cap_pipe_bytes_read,
2014 ld->cap_pipe_bytes_to_read - ld->cap_pipe_bytes_read);
2017 result = PD_PIPE_EOF;
2019 result = PD_PIPE_ERR;
2022 ld->cap_pipe_bytes_read += b;
2023 #else /* USE_THREADS */
2024 g_get_current_time(&wait_time);
2025 g_time_val_add(&wait_time, THREAD_READ_TIMEOUT);
2026 q_status = g_async_queue_timed_pop(cap_pipe_done_q, &wait_time);
2027 if (ld->cap_pipe_err == PIPEOF) {
2028 result = PD_PIPE_EOF;
2030 } else if (ld->cap_pipe_err == PIPERR) {
2031 result = PD_PIPE_ERR;
2037 #endif /* USE_THREADS */
2038 if ((ld->cap_pipe_bytes_read) < ld->cap_pipe_bytes_to_read)
2040 result = PD_DATA_READ;
2044 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2047 } /* switch (ld->cap_pipe_state) */
2050 * We've now read as much data as we were expecting, so process it.
2054 case PD_REC_HDR_READ:
2055 /* We've read the header. Take care of byte order. */
2056 cap_pipe_adjust_header(ld->cap_pipe_byte_swapped, &ld->cap_pipe_hdr,
2057 &ld->cap_pipe_rechdr.hdr);
2058 if (ld->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2059 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2060 ld->packet_count+1, ld->cap_pipe_rechdr.hdr.incl_len);
2063 ld->cap_pipe_state = STATE_EXPECT_DATA;
2067 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2068 phdr.ts.tv_sec = ld->cap_pipe_rechdr.hdr.ts_sec;
2069 phdr.ts.tv_usec = ld->cap_pipe_rechdr.hdr.ts_usec;
2070 phdr.caplen = ld->cap_pipe_rechdr.hdr.incl_len;
2071 phdr.len = ld->cap_pipe_rechdr.hdr.orig_len;
2073 capture_loop_packet_cb((u_char *)ld, &phdr, data);
2075 ld->cap_pipe_state = STATE_EXPECT_REC_HDR;
2079 ld->cap_pipe_err = PIPEOF;
2084 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2085 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2086 g_snprintf(errmsg, errmsgl,
2087 "Error reading from pipe: %s (error %d)",
2088 utf_16to8(err_str), GetLastError());
2091 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2099 ld->cap_pipe_err = PIPERR;
2100 /* Return here rather than inside the switch to prevent GCC warning */
2105 /** Open the capture input file (pcap or capture pipe).
2106 * Returns TRUE if it succeeds, FALSE otherwise. */
2108 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2109 char *errmsg, size_t errmsg_len,
2110 char *secondary_errmsg, size_t secondary_errmsg_len)
2112 gchar open_err_str[PCAP_ERRBUF_SIZE];
2113 gchar *sync_msg_str;
2116 gchar *sync_secondary_msg_str;
2117 WORD wVersionRequested;
2121 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", capture_opts->iface);
2124 /* XXX - opening Winsock on tshark? */
2126 /* Initialize Windows Socket if we are in a WIN32 OS
2127 This needs to be done before querying the interface for network/netmask */
2129 /* XXX - do we really require 1.1 or earlier?
2130 Are there any versions that support only 2.0 or higher? */
2131 wVersionRequested = MAKEWORD(1, 1);
2132 err = WSAStartup(wVersionRequested, &wsaData);
2136 case WSASYSNOTREADY:
2137 g_snprintf(errmsg, (gulong) errmsg_len,
2138 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2141 case WSAVERNOTSUPPORTED:
2142 g_snprintf(errmsg, (gulong) errmsg_len,
2143 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2144 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2147 case WSAEINPROGRESS:
2148 g_snprintf(errmsg, (gulong) errmsg_len,
2149 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2153 g_snprintf(errmsg, (gulong) errmsg_len,
2154 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2158 g_snprintf(errmsg, (gulong) errmsg_len,
2159 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2163 g_snprintf(errmsg, (gulong) errmsg_len,
2164 "Couldn't initialize Windows Sockets: error %d", err);
2167 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2172 ld->pcap_h = open_capture_device(capture_opts, open_err_str,
2173 sizeof open_err_str);
2175 if (ld->pcap_h != NULL) {
2176 /* we've opened "iface" as a network device */
2178 /* try to set the capture buffer size */
2179 if (capture_opts->buffer_size > 1 &&
2180 pcap_setbuff(ld->pcap_h, capture_opts->buffer_size * 1024 * 1024) != 0) {
2181 sync_secondary_msg_str = g_strdup_printf(
2182 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2183 "the default of 1MB will be used.\n"
2185 "Nonetheless, the capture is started.\n",
2186 capture_opts->buffer_size);
2187 report_capture_error("Couldn't set the capture buffer size!",
2188 sync_secondary_msg_str);
2189 g_free(sync_secondary_msg_str);
2193 #if defined(HAVE_PCAP_REMOTE) && defined(HAVE_PCAP_SETSAMPLING)
2194 if ((capture_opts->sampling_method != CAPTURE_SAMP_NONE) &&
2195 (strncmp (capture_opts->iface, "rpcap://", 8) == 0))
2197 struct pcap_samp *samp;
2199 if ((samp = pcap_setsampling(ld->pcap_h)) != NULL)
2201 switch (capture_opts->sampling_method)
2203 case CAPTURE_SAMP_BY_COUNT:
2204 samp->method = PCAP_SAMP_1_EVERY_N;
2207 case CAPTURE_SAMP_BY_TIMER:
2208 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2212 sync_msg_str = g_strdup_printf(
2213 "Unknown sampling method %d specified,\n"
2214 "continue without packet sampling",
2215 capture_opts->sampling_method);
2216 report_capture_error("Couldn't set the capture "
2217 "sampling", sync_msg_str);
2218 g_free(sync_msg_str);
2220 samp->value = capture_opts->sampling_param;
2224 report_capture_error("Couldn't set the capture sampling",
2225 "Cannot get packet sampling data structure");
2231 /* setting the data link type only works on real interfaces */
2232 if (!set_pcap_linktype(ld->pcap_h, capture_opts, errmsg, errmsg_len,
2233 secondary_errmsg, secondary_errmsg_len))
2235 ld->linktype = get_pcap_linktype(ld->pcap_h, capture_opts->iface);
2237 /* We couldn't open "iface" as a network device. */
2238 /* Try to open it as a pipe */
2239 cap_pipe_open_live(capture_opts->iface, &ld->cap_pipe_hdr, ld, errmsg, (int) errmsg_len);
2242 if (ld->cap_pipe_fd == -1) {
2244 if (ld->cap_pipe_h == INVALID_HANDLE_VALUE) {
2247 if (ld->cap_pipe_err == PIPNEXIST) {
2248 /* Pipe doesn't exist, so output message for interface */
2249 get_capture_device_open_failure_messages(open_err_str, errmsg,
2252 secondary_errmsg_len);
2255 * Else pipe (or file) does exist and cap_pipe_open_live() has
2260 /* cap_pipe_open_live() succeeded; don't want
2261 error message from pcap_open_live() */
2262 open_err_str[0] = '\0';
2265 /* XXX - will this work for tshark? */
2266 #ifdef MUST_DO_SELECT
2267 if (!ld->from_cap_pipe) {
2268 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2269 ld->pcap_fd = pcap_get_selectable_fd(ld->pcap_h);
2271 ld->pcap_fd = pcap_fileno(ld->pcap_h);
2276 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2277 returned a warning; print it, but keep capturing. */
2278 if (open_err_str[0] != '\0') {
2279 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2280 report_capture_error(sync_msg_str, "");
2281 g_free(sync_msg_str);
2287 /* close the capture input file (pcap or capture pipe) */
2288 static void capture_loop_close_input(loop_data *ld) {
2290 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2292 /* if open, close the capture pipe "input file" */
2294 if (ld->cap_pipe_fd >= 0) {
2295 g_assert(ld->from_cap_pipe);
2296 ws_close(ld->cap_pipe_fd);
2297 ld->cap_pipe_fd = 0;
2300 if (ld->cap_pipe_h != INVALID_HANDLE_VALUE) {
2301 CloseHandle(ld->cap_pipe_h);
2302 ld->cap_pipe_h = INVALID_HANDLE_VALUE;
2306 /* if open, close the pcap "input file" */
2307 if(ld->pcap_h != NULL) {
2308 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)ld->pcap_h);
2309 g_assert(!ld->from_cap_pipe);
2310 pcap_close(ld->pcap_h);
2317 /* Shut down windows sockets */
2323 /* init the capture filter */
2324 static initfilter_status_t
2325 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2326 gchar * iface, gchar * cfilter)
2328 struct bpf_program fcode;
2330 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2332 /* capture filters only work on real interfaces */
2333 if (cfilter && !from_cap_pipe) {
2334 /* A capture filter was specified; set it up. */
2335 if (!compile_capture_filter(iface, pcap_h, &fcode, cfilter)) {
2336 /* Treat this specially - our caller might try to compile this
2337 as a display filter and, if that succeeds, warn the user that
2338 the display and capture filter syntaxes are different. */
2339 return INITFILTER_BAD_FILTER;
2341 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2342 #ifdef HAVE_PCAP_FREECODE
2343 pcap_freecode(&fcode);
2345 return INITFILTER_OTHER_ERROR;
2347 #ifdef HAVE_PCAP_FREECODE
2348 pcap_freecode(&fcode);
2352 return INITFILTER_NO_ERROR;
2356 /* set up to write to the already-opened capture output file/files */
2358 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len) {
2362 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2365 if (ld->from_cap_pipe) {
2366 ld->file_snaplen = ld->cap_pipe_hdr.snaplen;
2369 ld->file_snaplen = pcap_snapshot(ld->pcap_h);
2372 /* Set up to write to the capture file. */
2373 if (capture_opts->multi_files_on) {
2374 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2376 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2379 gboolean successful;
2381 ld->bytes_written = 0;
2382 if (capture_opts->use_pcapng) {
2385 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2386 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err) &&
2387 libpcap_write_interface_description_block(ld->pdh, capture_opts->iface, capture_opts->cfilter, ld->linktype, ld->file_snaplen, &ld->bytes_written, &err);
2389 successful = libpcap_write_file_header(ld->pdh, ld->linktype, ld->file_snaplen,
2390 &ld->bytes_written, &err);
2398 if (ld->pdh == NULL) {
2399 /* We couldn't set up to write to the capture file. */
2400 /* XXX - use cf_open_error_message from tshark instead? */
2403 case WTAP_ERR_CANT_OPEN:
2404 g_snprintf(errmsg, errmsg_len, "The file to which the capture would be saved"
2405 " couldn't be created for some unknown reason.");
2408 case WTAP_ERR_SHORT_WRITE:
2409 g_snprintf(errmsg, errmsg_len, "A full header couldn't be written to the file"
2410 " to which the capture would be saved.");
2415 g_snprintf(errmsg, errmsg_len,
2416 "The file to which the capture would be"
2417 " saved (\"%s\") could not be opened: Error %d.",
2418 capture_opts->save_file, err);
2420 g_snprintf(errmsg, errmsg_len,
2421 "The file to which the capture would be"
2422 " saved (\"%s\") could not be opened: %s.",
2423 capture_opts->save_file, strerror(err));
2435 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close) {
2437 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2439 if (capture_opts->multi_files_on) {
2440 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2442 if (capture_opts->use_pcapng) {
2443 libpcap_write_interface_statistics_block(ld->pdh, 0, ld->pcap_h, &ld->bytes_written, err_close);
2445 return libpcap_dump_close(ld->pdh, err_close);
2449 /* dispatch incoming packets (pcap or capture pipe)
2451 * Waits for incoming packets to be available, and calls pcap_dispatch()
2452 * to cause them to be processed.
2454 * Returns the number of packets which were processed.
2456 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2457 * packet-batching behaviour does not cause packets to get held back
2461 capture_loop_dispatch(capture_options *capture_opts _U_, loop_data *ld,
2462 char *errmsg, int errmsg_len)
2465 gint packet_count_before;
2466 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2471 packet_count_before = ld->packet_count;
2472 if (ld->from_cap_pipe) {
2473 /* dispatch from capture pipe */
2474 #ifdef LOG_CAPTURE_VERBOSE
2475 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2478 sel_ret = cap_pipe_select(ld->cap_pipe_fd);
2481 if (sel_ret < 0 && errno != EINTR) {
2482 g_snprintf(errmsg, errmsg_len,
2483 "Unexpected error from select: %s", strerror(errno));
2484 report_capture_error(errmsg, please_report);
2489 * "select()" says we can read from the pipe without blocking
2491 #endif /* USE_THREADS */
2492 inpkts = cap_pipe_dispatch(ld, pcap_data, errmsg, errmsg_len);
2502 /* dispatch from pcap */
2503 #ifdef MUST_DO_SELECT
2505 * If we have "pcap_get_selectable_fd()", we use it to get the
2506 * descriptor on which to select; if that's -1, it means there
2507 * is no descriptor on which you can do a "select()" (perhaps
2508 * because you're capturing on a special device, and that device's
2509 * driver unfortunately doesn't support "select()", in which case
2510 * we don't do the select - which means it might not be possible
2511 * to stop a capture until a packet arrives. If that's unacceptable,
2512 * plead with whoever supplies the software for that device to add
2513 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2514 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2515 * later, so it can use pcap_breakloop().
2517 #ifdef LOG_CAPTURE_VERBOSE
2518 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2520 if (ld->pcap_fd != -1) {
2521 sel_ret = cap_pipe_select(ld->pcap_fd);
2524 * "select()" says we can read from it without blocking; go for
2527 * We don't have pcap_breakloop(), so we only process one packet
2528 * per pcap_dispatch() call, to allow a signal to stop the
2529 * processing immediately, rather than processing all packets
2530 * in a batch before quitting.
2532 inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb,
2536 /* Error, rather than pcap_breakloop(). */
2537 ld->pcap_err = TRUE;
2539 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2542 if (sel_ret < 0 && errno != EINTR) {
2543 g_snprintf(errmsg, errmsg_len,
2544 "Unexpected error from select: %s", strerror(errno));
2545 report_capture_error(errmsg, please_report);
2551 #endif /* MUST_DO_SELECT */
2553 /* dispatch from pcap without select */
2555 #ifdef LOG_CAPTURE_VERBOSE
2556 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2560 * On Windows, we don't support asynchronously telling a process to
2561 * stop capturing; instead, we check for an indication on a pipe
2562 * after processing packets. We therefore process only one packet
2563 * at a time, so that we can check the pipe after every packet.
2565 inpkts = pcap_dispatch(ld->pcap_h, 1, capture_loop_packet_cb, (u_char *) ld);
2567 inpkts = pcap_dispatch(ld->pcap_h, -1, capture_loop_packet_cb, (u_char *) ld);
2571 /* Error, rather than pcap_breakloop(). */
2572 ld->pcap_err = TRUE;
2574 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2576 #else /* pcap_next_ex */
2577 #ifdef LOG_CAPTURE_VERBOSE
2578 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2580 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2583 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2584 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2585 * This should be fixed in the WinPcap 4.0 alpha release.
2587 * For reference, an example remote interface:
2588 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2591 /* emulate dispatch from pcap */
2594 struct pcap_pkthdr *pkt_header;
2599 (in = pcap_next_ex(ld->pcap_h, &pkt_header, &pkt_data)) == 1)
2600 capture_loop_packet_cb( (u_char *) ld, pkt_header, pkt_data);
2603 ld->pcap_err = TRUE;
2607 #endif /* pcap_next_ex */
2611 #ifdef LOG_CAPTURE_VERBOSE
2612 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2615 return ld->packet_count - packet_count_before;
2619 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2620 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2622 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2623 char *errmsg, int errmsg_len) {
2626 gchar *capfile_name;
2627 gboolean is_tempfile;
2632 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2633 (capture_opts->save_file) ? capture_opts->save_file : "");
2635 if (capture_opts->save_file != NULL) {
2636 /* We return to the caller while the capture is in progress.
2637 * Therefore we need to take a copy of save_file in
2638 * case the caller destroys it after we return.
2640 capfile_name = g_strdup(capture_opts->save_file);
2642 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2643 if (capture_opts->multi_files_on) {
2644 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2645 g_snprintf(errmsg, errmsg_len,
2646 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2647 g_free(capfile_name);
2650 if (strcmp(capfile_name, "-") == 0) {
2651 /* write to stdout */
2654 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2655 _setmode(1, O_BINARY);
2658 } /* if (...output_to_pipe ... */
2661 if (capture_opts->multi_files_on) {
2662 /* ringbuffer is enabled */
2663 *save_file_fd = ringbuf_init(capfile_name,
2664 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0);
2666 /* we need the ringbuf name */
2667 if(*save_file_fd != -1) {
2668 g_free(capfile_name);
2669 capfile_name = g_strdup(ringbuf_current_filename());
2672 /* Try to open/create the specified file for use as a capture buffer. */
2673 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2677 is_tempfile = FALSE;
2679 /* Choose a random name for the temporary capture buffer */
2680 *save_file_fd = create_tempfile(&tmpname, "wireshark");
2681 capfile_name = g_strdup(tmpname);
2685 /* did we fail to open the output file? */
2686 if (*save_file_fd == -1) {
2688 g_snprintf(errmsg, errmsg_len,
2689 "The temporary file to which the capture would be saved (\"%s\") "
2690 "could not be opened: %s.", capfile_name, strerror(errno));
2692 if (capture_opts->multi_files_on) {
2693 ringbuf_error_cleanup();
2696 g_snprintf(errmsg, errmsg_len,
2697 "The file to which the capture would be saved (\"%s\") "
2698 "could not be opened: %s.", capfile_name,
2701 g_free(capfile_name);
2705 if(capture_opts->save_file != NULL) {
2706 g_free(capture_opts->save_file);
2708 capture_opts->save_file = capfile_name;
2709 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2710 "g_free(capfile_name)". */
2712 ret = fchown(*save_file_fd, capture_opts->owner, capture_opts->group);
2720 #define TIME_GET() GetTickCount()
2722 #define TIME_GET() time(NULL)
2725 /* Do the work of handling either the file size or file duration capture
2726 conditions being reached, and switching files or stopping. */
2728 do_file_switch_or_stop(capture_options *capture_opts,
2729 condition *cnd_autostop_files,
2730 condition *cnd_autostop_size,
2731 condition *cnd_file_duration)
2733 if (capture_opts->multi_files_on) {
2734 if (cnd_autostop_files != NULL &&
2735 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2736 /* no files left: stop here */
2737 global_ld.go = FALSE;
2741 /* Switch to the next ringbuffer file */
2742 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2743 &global_ld.save_file_fd, &global_ld.err)) {
2744 gboolean successful;
2746 /* File switch succeeded: reset the conditions */
2747 global_ld.bytes_written = 0;
2748 if (capture_opts->use_pcapng) {
2751 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2752 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &global_ld.bytes_written, &global_ld.err) &&
2753 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);
2755 successful = libpcap_write_file_header(global_ld.pdh, global_ld.linktype, global_ld.file_snaplen,
2756 &global_ld.bytes_written, &global_ld.err);
2759 fclose(global_ld.pdh);
2760 global_ld.pdh = NULL;
2761 global_ld.go = FALSE;
2764 if(cnd_autostop_size)
2765 cnd_reset(cnd_autostop_size);
2766 if(cnd_file_duration)
2767 cnd_reset(cnd_file_duration);
2768 libpcap_dump_flush(global_ld.pdh, NULL);
2770 report_packet_count(global_ld.inpkts_to_sync_pipe);
2771 global_ld.inpkts_to_sync_pipe = 0;
2772 report_new_capture_file(capture_opts->save_file);
2774 /* File switch failed: stop here */
2775 global_ld.go = FALSE;
2779 /* single file, stop now */
2780 global_ld.go = FALSE;
2786 /* Do the low-level work of a capture.
2787 Returns TRUE if it succeeds, FALSE otherwise. */
2789 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
2791 time_t upd_time, cur_time;
2795 condition *cnd_file_duration = NULL;
2796 condition *cnd_autostop_files = NULL;
2797 condition *cnd_autostop_size = NULL;
2798 condition *cnd_autostop_duration = NULL;
2801 gboolean cfilter_error = FALSE;
2802 char errmsg[MSG_MAX_LENGTH+1];
2803 char secondary_errmsg[MSG_MAX_LENGTH+1];
2806 *secondary_errmsg = '\0';
2808 /* init the loop data */
2809 global_ld.go = TRUE;
2810 global_ld.packet_count = 0;
2812 global_ld.report_packet_count = FALSE;
2814 if (capture_opts->has_autostop_packets)
2815 global_ld.packet_max = capture_opts->autostop_packets;
2817 global_ld.packet_max = 0; /* no limit */
2818 global_ld.inpkts_to_sync_pipe = 0;
2819 global_ld.err = 0; /* no error seen yet */
2820 global_ld.wtap_linktype = WTAP_ENCAP_UNKNOWN;
2821 global_ld.pcap_err = FALSE;
2822 global_ld.from_cap_pipe = FALSE;
2823 global_ld.pdh = NULL;
2825 global_ld.cap_pipe_fd = -1;
2827 global_ld.cap_pipe_h = INVALID_HANDLE_VALUE;
2829 #ifdef MUST_DO_SELECT
2830 global_ld.pcap_fd = 0;
2832 global_ld.autostop_files = 0;
2833 global_ld.save_file_fd = -1;
2835 /* We haven't yet gotten the capture statistics. */
2836 *stats_known = FALSE;
2838 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
2839 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
2841 /* open the "input file" from network interface or capture pipe */
2842 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
2843 secondary_errmsg, sizeof(secondary_errmsg))) {
2847 /* init the input filter from the network interface (capture pipe will do nothing) */
2848 switch (capture_loop_init_filter(global_ld.pcap_h, global_ld.from_cap_pipe,
2849 capture_opts->iface,
2850 capture_opts->cfilter)) {
2852 case INITFILTER_NO_ERROR:
2855 case INITFILTER_BAD_FILTER:
2856 cfilter_error = TRUE;
2857 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(global_ld.pcap_h));
2860 case INITFILTER_OTHER_ERROR:
2861 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
2862 pcap_geterr(global_ld.pcap_h));
2863 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
2867 /* If we're supposed to write to a capture file, open it for output
2868 (temporary/specified name/ringbuffer) */
2869 if (capture_opts->saving_to_file) {
2870 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
2871 errmsg, sizeof(errmsg))) {
2875 /* set up to write to the already-opened capture output file/files */
2876 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
2881 /* XXX - capture SIGTERM and close the capture, in case we're on a
2882 Linux 2.0[.x] system and you have to explicitly close the capture
2883 stream in order to turn promiscuous mode off? We need to do that
2884 in other places as well - and I don't think that works all the
2885 time in any case, due to libpcap bugs. */
2887 /* Well, we should be able to start capturing.
2889 Sync out the capture file, so the header makes it to the file system,
2890 and send a "capture started successfully and capture file created"
2891 message to our parent so that they'll open the capture file and
2892 update its windows to indicate that we have a live capture in
2894 libpcap_dump_flush(global_ld.pdh, NULL);
2895 report_new_capture_file(capture_opts->save_file);
2898 /* initialize capture stop (and alike) conditions */
2899 init_capture_stop_conditions();
2900 /* create stop conditions */
2901 if (capture_opts->has_autostop_filesize)
2903 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
2904 if (capture_opts->has_autostop_duration)
2905 cnd_autostop_duration =
2906 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
2908 if (capture_opts->multi_files_on) {
2909 if (capture_opts->has_file_duration)
2911 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
2913 if (capture_opts->has_autostop_files)
2914 cnd_autostop_files =
2915 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
2918 /* init the time values */
2919 start_time = TIME_GET();
2920 upd_time = TIME_GET();
2922 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
2924 /* WOW, everything is prepared! */
2925 /* please fasten your seat belts, we will enter now the actual capture loop */
2926 while (global_ld.go) {
2927 /* dispatch incoming packets */
2928 inpkts = capture_loop_dispatch(capture_opts, &global_ld, errmsg,
2932 /* Were we asked to print packet counts by the SIGINFO handler? */
2933 if (global_ld.report_packet_count) {
2934 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
2935 plurality(global_ld.packet_count, "", "s"));
2936 global_ld.report_packet_count = FALSE;
2941 /* any news from our parent (signal pipe)? -> just stop the capture */
2942 if (!signal_pipe_check_running()) {
2943 global_ld.go = FALSE;
2948 global_ld.inpkts_to_sync_pipe += inpkts;
2950 /* check capture size condition */
2951 if (cnd_autostop_size != NULL &&
2952 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
2953 /* Capture size limit reached, do we have another file? */
2954 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
2955 cnd_autostop_size, cnd_file_duration))
2957 } /* cnd_autostop_size */
2958 if (capture_opts->output_to_pipe) {
2959 libpcap_dump_flush(global_ld.pdh, NULL);
2963 /* Only update once a second (Win32: 500ms) so as not to overload slow
2964 * displays. This also prevents too much context-switching between the
2965 * dumpcap and wireshark processes */
2966 cur_time = TIME_GET();
2968 if ( (cur_time - upd_time) > 500) {
2970 if (cur_time - upd_time > 0) {
2972 upd_time = cur_time;
2974 /*if (pcap_stats(pch, stats) >= 0) {
2975 *stats_known = TRUE;
2978 /* Let the parent process know. */
2979 if (global_ld.inpkts_to_sync_pipe) {
2981 libpcap_dump_flush(global_ld.pdh, NULL);
2983 /* Send our parent a message saying we've written out
2984 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
2986 report_packet_count(global_ld.inpkts_to_sync_pipe);
2988 global_ld.inpkts_to_sync_pipe = 0;
2991 /* check capture duration condition */
2992 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
2993 /* The maximum capture time has elapsed; stop the capture. */
2994 global_ld.go = FALSE;
2998 /* check capture file duration condition */
2999 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3000 /* duration limit reached, do we have another file? */
3001 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3002 cnd_autostop_size, cnd_file_duration))
3004 } /* cnd_file_duration */
3007 } /* while (global_ld.go) */
3009 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3011 /* delete stop conditions */
3012 if (cnd_file_duration != NULL)
3013 cnd_delete(cnd_file_duration);
3014 if (cnd_autostop_files != NULL)
3015 cnd_delete(cnd_autostop_files);
3016 if (cnd_autostop_size != NULL)
3017 cnd_delete(cnd_autostop_size);
3018 if (cnd_autostop_duration != NULL)
3019 cnd_delete(cnd_autostop_duration);
3021 /* did we had a pcap (input) error? */
3022 if (global_ld.pcap_err) {
3023 /* On Linux, if an interface goes down while you're capturing on it,
3024 you'll get a "recvfrom: Network is down" error (ENETDOWN).
3025 (At least you will if strerror() doesn't show a local translation
3028 On FreeBSD and OS X, if a network adapter disappears while
3029 you're capturing on it, you'll get a "read: Device not configured"
3030 error (ENXIO). (See previous parenthetical note.)
3032 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3034 These should *not* be reported to the Wireshark developers. */
3037 cap_err_str = pcap_geterr(global_ld.pcap_h);
3038 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3039 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3040 strcmp(cap_err_str, "read: I/O error") == 0) {
3041 report_capture_error("The network adapter on which the capture was being done "
3042 "is no longer running; the capture has stopped.",
3045 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3047 report_capture_error(errmsg, please_report);
3050 else if (global_ld.from_cap_pipe && global_ld.cap_pipe_err == PIPERR)
3051 report_capture_error(errmsg, "");
3053 /* did we had an error while capturing? */
3054 if (global_ld.err == 0) {
3057 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3058 global_ld.err, FALSE);
3059 report_capture_error(errmsg, please_report);
3063 if (capture_opts->saving_to_file) {
3064 /* close the wiretap (output) file */
3065 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3069 /* there might be packets not yet notified to the parent */
3070 /* (do this after closing the file, so all packets are already flushed) */
3071 if(global_ld.inpkts_to_sync_pipe) {
3073 report_packet_count(global_ld.inpkts_to_sync_pipe);
3074 global_ld.inpkts_to_sync_pipe = 0;
3077 /* If we've displayed a message about a write error, there's no point
3078 in displaying another message about an error on close. */
3079 if (!close_ok && write_ok) {
3080 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3082 report_capture_error(errmsg, "");
3086 * XXX We exhibit different behaviour between normal mode and sync mode
3087 * when the pipe is stdin and not already at EOF. If we're a child, the
3088 * parent's stdin isn't closed, so if the user starts another capture,
3089 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3090 * will say "Unrecognized libpcap format". On the other hand, in normal
3091 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3094 /* get packet drop statistics from pcap */
3095 if(global_ld.pcap_h != NULL) {
3096 g_assert(!global_ld.from_cap_pipe);
3097 /* Get the capture statistics, so we know how many packets were
3099 if (pcap_stats(global_ld.pcap_h, stats) >= 0) {
3100 *stats_known = TRUE;
3101 /* Let the parent process know. */
3102 report_packet_drops(stats->ps_drop);
3104 g_snprintf(errmsg, sizeof(errmsg),
3105 "Can't get packet-drop statistics: %s",
3106 pcap_geterr(global_ld.pcap_h));
3107 report_capture_error(errmsg, please_report);
3111 /* close the input file (pcap or capture pipe) */
3112 capture_loop_close_input(&global_ld);
3114 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3116 /* ok, if the write and the close were successful. */
3117 return write_ok && close_ok;
3120 if (capture_opts->multi_files_on) {
3121 /* cleanup ringbuffer */
3122 ringbuf_error_cleanup();
3124 /* We can't use the save file, and we have no FILE * for the stream
3125 to close in order to close it, so close the FD directly. */
3126 if(global_ld.save_file_fd != -1) {
3127 ws_close(global_ld.save_file_fd);
3130 /* We couldn't even start the capture, so get rid of the capture
3132 if(capture_opts->save_file != NULL) {
3133 ws_unlink(capture_opts->save_file);
3134 g_free(capture_opts->save_file);
3137 capture_opts->save_file = NULL;
3139 report_cfilter_error(capture_opts->cfilter, errmsg);
3141 report_capture_error(errmsg, secondary_errmsg);
3143 /* close the input file (pcap or cap_pipe) */
3144 capture_loop_close_input(&global_ld);
3146 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3152 static void capture_loop_stop(void)
3154 #ifdef HAVE_PCAP_BREAKLOOP
3155 if(global_ld.pcap_h != NULL)
3156 pcap_breakloop(global_ld.pcap_h);
3158 global_ld.go = FALSE;
3163 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3164 int err, gboolean is_close)
3169 g_snprintf(errmsg, errmsglen,
3170 "Not all the packets could be written to the file"
3171 " to which the capture was being saved\n"
3172 "(\"%s\") because there is no space left on the file system\n"
3173 "on which that file resides.",
3179 g_snprintf(errmsg, errmsglen,
3180 "Not all the packets could be written to the file"
3181 " to which the capture was being saved\n"
3182 "(\"%s\") because you are too close to, or over,"
3183 " your disk quota\n"
3184 "on the file system on which that file resides.",
3189 case WTAP_ERR_CANT_CLOSE:
3190 g_snprintf(errmsg, errmsglen,
3191 "The file to which the capture was being saved"
3192 " couldn't be closed for some unknown reason.");
3195 case WTAP_ERR_SHORT_WRITE:
3196 g_snprintf(errmsg, errmsglen,
3197 "Not all the packets could be written to the file"
3198 " to which the capture was being saved\n"
3205 g_snprintf(errmsg, errmsglen,
3206 "The file to which the capture was being saved\n"
3207 "(\"%s\") could not be closed: %s.",
3208 fname, wtap_strerror(err));
3210 g_snprintf(errmsg, errmsglen,
3211 "An error occurred while writing to the file"
3212 " to which the capture was being saved\n"
3214 fname, wtap_strerror(err));
3221 /* one packet was captured, process it */
3223 capture_loop_packet_cb(u_char *user, const struct pcap_pkthdr *phdr,
3226 loop_data *ld = (loop_data *) (void *) user;
3229 /* We may be called multiple times from pcap_dispatch(); if we've set
3230 the "stop capturing" flag, ignore this packet, as we're not
3231 supposed to be saving any more packets. */
3236 gboolean successful;
3237 /* We're supposed to write the packet to a file; do so.
3238 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3239 "ld->err" to the error. */
3240 if (global_capture_opts.use_pcapng) {
3241 successful = libpcap_write_enhanced_packet_block(ld->pdh, phdr, 0, pd, &ld->bytes_written, &err);
3243 successful = libpcap_write_packet(ld->pdh, phdr, pd, &ld->bytes_written, &err);
3250 /* if the user told us to stop after x packets, do we already have enough? */
3251 if ((ld->packet_max > 0) && (ld->packet_count >= ld->packet_max))
3260 /* And now our feature presentation... [ fade to music ] */
3262 main(int argc, char *argv[])
3265 gboolean arg_error = FALSE;
3270 struct sigaction action, oldaction;
3273 gboolean start_capture = TRUE;
3274 gboolean stats_known;
3275 struct pcap_stat stats;
3276 GLogLevelFlags log_flags;
3277 gboolean list_interfaces = FALSE;
3278 gboolean list_link_layer_types = FALSE;
3279 #ifdef HAVE_BPF_IMAGE
3280 gboolean print_bpf_code = FALSE;
3282 gboolean machine_readable = FALSE;
3283 gboolean print_statistics = FALSE;
3284 int status, run_once_args = 0;
3286 #if defined(__APPLE__) && defined(__LP64__)
3287 struct utsname osinfo;
3290 #ifdef HAVE_PCAP_REMOTE
3291 #define OPTSTRING_A "A:"
3292 #define OPTSTRING_r "r"
3293 #define OPTSTRING_u "u"
3295 #define OPTSTRING_A ""
3296 #define OPTSTRING_r ""
3297 #define OPTSTRING_u ""
3300 #ifdef HAVE_PCAP_SETSAMPLING
3301 #define OPTSTRING_m "m:"
3303 #define OPTSTRING_m ""
3306 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3307 #define OPTSTRING_B "B:"
3309 #define OPTSTRING_B ""
3310 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3312 #ifdef HAVE_PCAP_CREATE
3313 #define OPTSTRING_I "I"
3315 #define OPTSTRING_I ""
3318 #ifdef HAVE_BPF_IMAGE
3319 #define OPTSTRING_d "d"
3321 #define OPTSTRING_d ""
3324 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:hi:" OPTSTRING_I "L" OPTSTRING_m "Mnpq" OPTSTRING_r "Ss:" OPTSTRING_u "vw:y:Z:"
3326 #ifdef DEBUG_CHILD_DUMPCAP
3327 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3328 fprintf (stderr, "Unable to open debug log file !\n");
3333 #if defined(__APPLE__) && defined(__LP64__)
3335 * Is this Mac OS X 10.6.x, other than 10.6.2? If so, we need a bug
3336 * workaround - timeouts less than 1 second don't work with libpcap
3337 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3338 * and re-introduced in 10.6.3. We don't know whether it'll be fixed
3339 * again in a later 10.6.x release; we'll assume that it'll be fixed
3340 * in any future major releases.)
3342 if (uname(&osinfo) == 0) {
3344 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3345 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3346 * number of 10.0.0, not 10.1.0 - go figure).
3348 if (strncmp(osinfo.release, "10.", 3) == 0) {
3350 * OK, it's Snow Leopard - which version?
3352 if (strcmp(osinfo.release, "10.2.0") != 0) {
3354 need_timeout_workaround = TRUE;
3361 * Determine if dumpcap is being requested to run in a special
3362 * capture_child mode by going thru the command line args to see if
3363 * a -Z is present. (-Z is a hidden option).
3365 * The primary result of running in capture_child mode is that
3366 * all messages sent out on stderr are in a special type/len/string
3367 * format to allow message processing by type. These messages include
3368 * error messages if dumpcap fails to start the operation it was
3369 * requested to do, as well as various "status" messages which are sent
3370 * when an actual capture is in progress, and a "success" message sent
3371 * if dumpcap was requested to perform an operation other than a
3374 * Capture_child mode would normally be requested by a parent process
3375 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3376 * to which dumpcap stderr has been redirected. It might also have
3377 * another pipe to obtain dumpcap stdout output; for operations other
3378 * than a capture, that information is formatted specially for easier
3379 * parsing by the parent process.
3381 * Capture_child mode needs to be determined immediately upon
3382 * startup so that any messages generated by dumpcap in this mode
3383 * (eg: during initialization) will be formatted properly.
3386 for (i=1; i<argc; i++) {
3387 if (strcmp("-Z", argv[i]) == 0) {
3388 capture_child = TRUE;
3389 machine_readable = TRUE; /* request machine-readable output */
3391 /* set output pipe to binary mode, to avoid ugly text conversions */
3392 _setmode(2, O_BINARY);
3397 /* The default_log_handler will use stdout, which makes trouble in */
3398 /* capture child mode, as it uses stdout for it's sync_pipe. */
3399 /* So: the filtering is done in the console_log_handler and not here.*/
3400 /* We set the log handlers right up front to make sure that any log */
3401 /* messages when running as child will be sent back to the parent */
3402 /* with the correct format. */
3406 G_LOG_LEVEL_CRITICAL|
3407 G_LOG_LEVEL_WARNING|
3408 G_LOG_LEVEL_MESSAGE|
3411 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3413 g_log_set_handler(NULL,
3415 console_log_handler, NULL /* user_data */);
3416 g_log_set_handler(LOG_DOMAIN_MAIN,
3418 console_log_handler, NULL /* user_data */);
3419 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3421 console_log_handler, NULL /* user_data */);
3422 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3424 console_log_handler, NULL /* user_data */);
3427 /* Load wpcap if possible. Do this before collecting the run-time version information */
3430 /* ... and also load the packet.dll from wpcap */
3431 /* XXX - currently not required, may change later. */
3432 /*wpcap_packet_load();*/
3434 /* Start windows sockets */
3435 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3437 /* Set handler for Ctrl+C key */
3438 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3440 /* Prepare to read from a pipe */
3441 if (!g_thread_supported ())
3442 g_thread_init (NULL);
3443 cap_pipe_pending_q = g_async_queue_new();
3444 cap_pipe_done_q = g_async_queue_new();
3445 cap_pipe_read_mtx = g_mutex_new();
3448 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3450 action.sa_handler = capture_cleanup_handler;
3452 * Arrange that system calls not get restarted, because when
3453 * our signal handler returns we don't want to restart
3454 * a call that was waiting for packets to arrive.
3456 action.sa_flags = 0;
3457 sigemptyset(&action.sa_mask);
3458 sigaction(SIGTERM, &action, NULL);
3459 sigaction(SIGINT, &action, NULL);
3460 sigaction(SIGPIPE, &action, NULL);
3461 sigaction(SIGHUP, NULL, &oldaction);
3462 if (oldaction.sa_handler == SIG_DFL)
3463 sigaction(SIGHUP, &action, NULL);
3466 /* Catch SIGINFO and, if we get it and we're capturing in
3467 quiet mode, report the number of packets we've captured. */
3468 action.sa_handler = report_counts_siginfo;
3469 action.sa_flags = SA_RESTART;
3470 sigemptyset(&action.sa_mask);
3471 sigaction(SIGINFO, &action, NULL);
3472 #endif /* SIGINFO */
3475 /* ----------------------------------------------------------------- */
3476 /* Privilege and capability handling */
3478 /* 1. Running not as root or suid root; no special capabilities. */
3481 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3484 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3486 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3487 /* capabilities; Drop all other capabilities; */
3488 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3489 /* else: after pcap_open_live() in capture_loop_open_input() */
3490 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3491 /* (Note: this means that the process, although logged in */
3492 /* as root, does not have various permissions such as the */
3493 /* ability to bypass file access permissions). */
3494 /* XXX: Should we just leave capabilities alone in this case */
3495 /* so that user gets expected effect that root can do */
3498 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3500 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3501 /* else: after pcap_open_live() in capture_loop_open_input() */
3502 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3503 /* pcap_open_live). */
3505 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3507 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3508 /* capabilities; Drop all other capabilities; */
3509 /* Drop suid privileges (euid=ruid); */
3510 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3511 /* else: after pcap_open_live() in capture_loop_open_input() */
3512 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3514 /* XXX: For some Linux versions/distros with capabilities */
3515 /* a 'normal' process with any capabilities cannot be */
3516 /* 'killed' (signaled) from another (same uid) non-privileged */
3518 /* For example: If (non-suid) Wireshark forks a */
3519 /* child suid dumpcap which acts as described here (case 5), */
3520 /* Wireshark will be unable to kill (signal) the child */
3521 /* dumpcap process until the capabilities have been dropped */
3522 /* (after pcap_open_live()). */
3523 /* This behaviour will apparently be changed in the kernel */
3524 /* to allow the kill (signal) in this case. */
3525 /* See the following for details: */
3526 /* http://www.mail-archive.com/ [wrapped] */
3527 /* linux-security-module@vger.kernel.org/msg02913.html */
3529 /* It is therefore conceivable that if dumpcap somehow hangs */
3530 /* in pcap_open_live or before that wireshark will not */
3531 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3532 /* In this case, exiting wireshark will kill the child */
3533 /* dumpcap process. */
3535 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3536 /* capabilities; Using libcap. Note: capset cmd (which see) */
3537 /* used to assign capabilities to file. */
3539 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3540 /* else: after pcap_open_live() in capture_loop_open_input() */
3541 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3543 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3544 /* longer required (similar to capture). */
3546 /* ----------------------------------------------------------------- */
3548 get_credential_info();
3551 /* If 'started with special privileges' (and using libcap) */
3552 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3553 /* Set euid/egid = ruid/rgid to remove suid privileges */
3554 relinquish_privs_except_capture();
3557 /* Set the initial values in the capture options. This might be overwritten
3558 by the command line parameters. */
3559 capture_opts_init(&global_capture_opts, NULL);
3561 /* Default to capturing the entire packet. */
3562 global_capture_opts.snaplen = WTAP_MAX_PACKET_SIZE;
3564 /* We always save to a file - if no file was specified, we save to a
3566 global_capture_opts.saving_to_file = TRUE;
3567 global_capture_opts.has_ring_num_files = TRUE;
3569 /* Now get our args */
3570 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3572 case 'h': /* Print help and exit */
3576 case 'v': /* Show version and exit */
3578 GString *comp_info_str;
3579 GString *runtime_info_str;
3580 /* Assemble the compile-time version information string */
3581 comp_info_str = g_string_new("Compiled ");
3582 get_compiled_version_info(comp_info_str, NULL);
3584 /* Assemble the run-time version information string */
3585 runtime_info_str = g_string_new("Running ");
3586 get_runtime_version_info(runtime_info_str, NULL);
3587 show_version(comp_info_str, runtime_info_str);
3588 g_string_free(comp_info_str, TRUE);
3589 g_string_free(runtime_info_str, TRUE);
3593 /*** capture option specific ***/
3594 case 'a': /* autostop criteria */
3595 case 'b': /* Ringbuffer option */
3596 case 'c': /* Capture x packets */
3597 case 'f': /* capture filter */
3598 case 'i': /* Use interface x */
3599 case 'n': /* Use pcapng format */
3600 case 'p': /* Don't capture in promiscuous mode */
3601 case 's': /* Set the snapshot (capture) length */
3602 case 'w': /* Write to capture file x */
3603 case 'y': /* Set the pcap data link type */
3604 #ifdef HAVE_PCAP_REMOTE
3605 case 'u': /* Use UDP for data transfer */
3606 case 'r': /* Capture own RPCAP traffic too */
3607 case 'A': /* Authentication */
3609 #ifdef HAVE_PCAP_SETSAMPLING
3610 case 'm': /* Sampling */
3612 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3613 case 'B': /* Buffer size */
3614 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3615 #ifdef HAVE_PCAP_CREATE
3616 case 'I': /* Monitor mode */
3618 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
3623 /*** hidden option: Wireshark child mode (using binary output messages) ***/
3625 capture_child = TRUE;
3627 /* set output pipe to binary mode, to avoid ugly text conversions */
3628 _setmode(2, O_BINARY);
3630 * optarg = the control ID, aka the PPID, currently used for the
3633 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
3634 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
3635 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
3636 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
3638 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
3639 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3640 "Signal pipe: Unable to open %s. Dead parent?",
3648 case 'q': /* Quiet */
3652 /*** all non capture option specific ***/
3653 case 'D': /* Print a list of capture devices and exit */
3654 list_interfaces = TRUE;
3657 case 'L': /* Print list of link-layer types and exit */
3658 list_link_layer_types = TRUE;
3661 #ifdef HAVE_BPF_IMAGE
3662 case 'd': /* Print BPF code for capture filter and exit */
3663 print_bpf_code = TRUE;
3667 case 'S': /* Print interface statistics once a second */
3668 print_statistics = TRUE;
3671 case 'M': /* For -D, -L, and -S, print machine-readable output */
3672 machine_readable = TRUE;
3675 case '?': /* Bad flag - print usage message */
3676 cmdarg_err("Invalid Option: %s", argv[optind-1]);
3684 /* user specified file name as regular command-line argument */
3685 /* XXX - use it as the capture file name (or something else)? */
3692 * Extra command line arguments were specified; complain.
3693 * XXX - interpret as capture filter, as tcpdump and tshark do?
3695 cmdarg_err("Invalid argument: %s", argv[0]);
3704 if (run_once_args > 1) {
3705 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
3707 } else if (run_once_args == 1) {
3708 /* We're supposed to print some information, rather than
3709 to capture traffic; did they specify a ring buffer option? */
3710 if (global_capture_opts.multi_files_on) {
3711 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
3715 /* We're supposed to capture traffic; was the ring buffer option
3716 specified and, if so, does it make sense? */
3717 if (global_capture_opts.multi_files_on) {
3718 /* Ring buffer works only under certain conditions:
3719 a) ring buffer does not work with temporary files;
3720 b) it makes no sense to enable the ring buffer if the maximum
3721 file size is set to "infinite". */
3722 if (global_capture_opts.save_file == NULL) {
3723 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
3724 global_capture_opts.multi_files_on = FALSE;
3726 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
3727 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
3728 /* XXX - this must be redesigned as the conditions changed */
3729 /* global_capture_opts.multi_files_on = FALSE;*/
3735 * "-D" requires no interface to be selected; it's supposed to list
3738 if (list_interfaces) {
3739 /* Get the list of interfaces */
3744 if_list = capture_interface_list(&err, &err_str);
3745 if (if_list == NULL) {
3747 case CANT_GET_INTERFACE_LIST:
3748 cmdarg_err("%s", err_str);
3753 case NO_INTERFACES_FOUND:
3755 * If we're being run by another program, just give them
3756 * an empty list of interfaces, don't report this as
3757 * an error; that lets them decide whether to report
3758 * this as an error or not.
3760 if (!machine_readable) {
3761 cmdarg_err("There are no interfaces on which a capture can be done");
3768 if (machine_readable) /* tab-separated values to stdout */
3769 print_machine_readable_interfaces(if_list);
3771 capture_opts_print_interfaces(if_list);
3772 free_interface_list(if_list);
3777 * "-S" requires no interface to be selected; it gives statistics
3778 * for all interfaces.
3780 if (print_statistics) {
3781 status = print_statistics_loop(machine_readable);
3786 * "-L", "-d", and capturing act on a particular interface, so we have to
3787 * have an interface; if none was specified, pick a default.
3789 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
3790 /* cmdarg_err() already called .... */
3794 /* Let the user know what interface was chosen. */
3795 /* get_interface_descriptive_name() is not available! */
3796 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n", global_capture_opts.iface);
3798 if (list_link_layer_types) {
3799 /* Get the list of link-layer types for the capture device. */
3800 if_capabilities_t *caps;
3803 caps = get_if_capabilities(global_capture_opts.iface,
3804 global_capture_opts.monitor_mode, &err_str);
3806 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
3807 "Please check to make sure you have sufficient permissions, and that\n"
3808 "you have the proper interface or pipe specified.", global_capture_opts.iface, err_str);
3812 if (caps->data_link_types == NULL) {
3813 cmdarg_err("The capture device \"%s\" has no data link types.", global_capture_opts.iface);
3816 if (machine_readable) /* tab-separated values to stdout */
3817 print_machine_readable_if_capabilities(caps);
3819 capture_opts_print_if_capabilities(caps,
3820 global_capture_opts.monitor_mode);
3821 free_if_capabilities(caps);
3825 /* We're supposed to do a capture, or print the BPF code for a filter.
3826 Process the snapshot length, as that affects the generated BPF code. */
3827 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
3829 #ifdef HAVE_BPF_IMAGE
3830 if (print_bpf_code) {
3831 show_filter_code(&global_capture_opts);
3836 /* We're supposed to do a capture. Process the ring buffer arguments. */
3837 capture_opts_trim_ring_num_files(&global_capture_opts);
3839 /* Now start the capture. */
3841 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
3845 /* capture failed */
3852 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
3853 const char *message, gpointer user_data _U_)
3860 /* ignore log message, if log_level isn't interesting */
3861 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
3862 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
3867 /* create a "timestamp" */
3869 today = localtime(&curr);
3871 switch(log_level & G_LOG_LEVEL_MASK) {
3872 case G_LOG_LEVEL_ERROR:
3875 case G_LOG_LEVEL_CRITICAL:
3878 case G_LOG_LEVEL_WARNING:
3881 case G_LOG_LEVEL_MESSAGE:
3884 case G_LOG_LEVEL_INFO:
3887 case G_LOG_LEVEL_DEBUG:
3891 fprintf(stderr, "unknown log_level %u\n", log_level);
3893 g_assert_not_reached();
3896 /* Generate the output message */
3897 if(log_level & G_LOG_LEVEL_MESSAGE) {
3898 /* normal user messages without additional infos */
3899 msg = g_strdup_printf("%s\n", message);
3901 /* info/debug messages with additional infos */
3902 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
3903 today->tm_hour, today->tm_min, today->tm_sec,
3904 log_domain != NULL ? log_domain : "",
3908 /* DEBUG & INFO msgs (if we're debugging today) */
3909 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
3910 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
3911 #ifdef DEBUG_DUMPCAP
3912 fprintf(stderr, "%s", msg);
3915 #ifdef DEBUG_CHILD_DUMPCAP
3916 fprintf(debug_log, "%s", msg);
3924 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
3925 /* to parent especially formatted if dumpcap running as child. */
3926 if (capture_child) {
3927 sync_pipe_errmsg_to_parent(2, msg, "");
3929 fprintf(stderr, "%s", msg);
3936 /****************************************************************************************************************/
3937 /* indication report routines */
3941 report_packet_count(int packet_count)
3943 char tmp[SP_DECISIZE+1+1];
3944 static int count = 0;
3947 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
3948 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
3949 pipe_write_block(2, SP_PACKET_COUNT, tmp);
3951 count += packet_count;
3952 fprintf(stderr, "\rPackets: %u ", count);
3953 /* stderr could be line buffered */
3959 report_new_capture_file(const char *filename)
3962 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
3963 pipe_write_block(2, SP_FILE, filename);
3967 * Prevent a SIGINFO handler from writing to the standard error
3968 * while we're doing so; instead, have it just set a flag telling
3969 * us to print that information when we're done.
3972 #endif /* SIGINFO */
3973 fprintf(stderr, "File: %s\n", filename);
3974 /* stderr could be line buffered */
3979 * Allow SIGINFO handlers to write.
3984 * If a SIGINFO handler asked us to write out capture counts, do so.
3988 #endif /* SIGINFO */
3993 report_cfilter_error(const char *cfilter, const char *errmsg)
3995 if (capture_child) {
3996 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
3997 pipe_write_block(2, SP_BAD_FILTER, errmsg);
4000 "Invalid capture filter: \"%s\"!\n"
4002 "That string isn't a valid capture filter (%s).\n"
4003 "See the User's Guide for a description of the capture filter syntax.\n",
4009 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4012 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4013 "Primary Error: %s", error_msg);
4014 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4015 "Secondary Error: %s", secondary_error_msg);
4016 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4018 fprintf(stderr, "%s\n%s\n", error_msg, secondary_error_msg);
4023 report_packet_drops(guint32 drops)
4025 char tmp[SP_DECISIZE+1+1];
4027 g_snprintf(tmp, sizeof(tmp), "%u", drops);
4030 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets dropped: %s", tmp);
4031 pipe_write_block(2, SP_DROPS, tmp);
4033 fprintf(stderr, "Packets dropped: %s\n", tmp);
4034 /* stderr could be line buffered */
4040 /****************************************************************************************************************/
4041 /* signal_pipe handling */
4046 signal_pipe_check_running(void)
4048 /* any news from our parent? -> just stop the capture */
4052 /* if we are running standalone, no check required */
4053 if(!capture_child) {
4057 if(!sig_pipe_name || !sig_pipe_handle) {
4058 /* This shouldn't happen */
4059 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4060 "Signal pipe: No name or handle");
4065 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4066 * at this point. Should we check to see if the parent is still alive,
4067 * e.g. by using OpenProcess?
4070 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4072 if(!result || avail > 0) {
4073 /* peek failed or some bytes really available */
4074 /* (if not piping from stdin this would fail) */
4075 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4076 "Signal pipe: Stop capture: %s", sig_pipe_name);
4077 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4078 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4079 sig_pipe_handle, result, avail);
4082 /* pipe ok and no bytes available */
4089 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4094 * indent-tabs-mode: nil
4097 * vi: set shiftwidth=4 tabstop=8 expandtab
4098 * :indentSize=4:tabSize=8:noTabs=true: