5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
63 #include "wsutil/wsgetopt.h"
71 # include <sys/prctl.h>
72 # include <sys/capability.h>
75 #include "ringbuffer.h"
76 #include "clopts_common.h"
77 #include "console_io.h"
78 #include "cmdarg_err.h"
79 #include "version_info.h"
81 #include "capture-pcap-util.h"
86 #include "capture-wpcap.h"
87 #include <wsutil/unicode-utils.h>
91 #include <sys/socket.h>
95 #ifdef NEED_INET_V6DEFS_H
96 # include "wsutil/inet_v6defs.h"
99 #include <wsutil/privileges.h>
101 #include "sync_pipe.h"
103 #include "capture_opts.h"
104 #include "capture_ifinfo.h"
105 #include "capture_sync.h"
107 #include "conditions.h"
108 #include "capture_stop_conditions.h"
110 #include "tempfile.h"
112 #include "wsutil/file_util.h"
115 * Get information about libpcap format from "wiretap/libpcap.h".
116 * XXX - can we just use pcap_open_offline() to read the pipe?
118 #include "wiretap/libpcap.h"
120 /**#define DEBUG_DUMPCAP**/
121 /**#define DEBUG_CHILD_DUMPCAP**/
125 #include <conio.h> /* _getch() */
129 #ifdef DEBUG_CHILD_DUMPCAP
130 FILE *debug_log; /* for logging debug messages to */
131 /* a file if DEBUG_CHILD_DUMPCAP */
135 static GAsyncQueue *pcap_queue;
136 static gint64 pcap_queue_bytes;
137 static gint64 pcap_queue_packets;
138 static gint64 pcap_queue_byte_limit = 1024 * 1024;
139 static gint64 pcap_queue_packet_limit = 1000;
141 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
143 static gchar *sig_pipe_name = NULL;
144 static HANDLE sig_pipe_handle = NULL;
145 static gboolean signal_pipe_check_running(void);
149 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
150 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
153 /** Stop a low-level capture (stops the capture child). */
154 static void capture_loop_stop(void);
156 #if !defined (__linux__)
157 #ifndef HAVE_PCAP_BREAKLOOP
159 * We don't have pcap_breakloop(), which is the only way to ensure that
160 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
161 * won't, if the call to read the next packet or batch of packets is
162 * is interrupted by a signal on UN*X, just go back and try again to
165 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
166 * the signal handler, set a flag to stop capturing; however, without
167 * a guarantee of that sort, we can't guarantee that we'll stop capturing
168 * if the read will be retried and won't time out if no packets arrive.
170 * Therefore, on at least some platforms, we work around the lack of
171 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
172 * to wait for packets to arrive, so that we're probably going to be
173 * blocked in the select() when the signal arrives, and can just bail
174 * out of the loop at that point.
176 * However, we don't want to do that on BSD (because "select()" doesn't work
177 * correctly on BPF devices on at least some releases of some flavors of
178 * BSD), and we don't want to do it on Windows (because "select()" is
179 * something for sockets, not for arbitrary handles). (Note that "Windows"
180 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
181 * using WinPcap, not a UNIX libpcap.)
183 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
184 * on BSD times out even if no packets have arrived, so we'll eventually
185 * exit pcap_dispatch() with an indication that no packets have arrived,
186 * and will break out of the capture loop at that point.
188 * On Windows, we can't send a SIGINT to stop capturing, so none of this
189 * applies in any case.
191 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
192 * want to include it if it's not present on this platform, however.
194 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
195 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
197 # define MUST_DO_SELECT
198 # endif /* avoid select */
199 #endif /* HAVE_PCAP_BREAKLOOP */
201 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
202 * in pcap_dispatch(); on the other hand, select() works just fine there.
203 * Hence we use a select for that come what may.
205 #define MUST_DO_SELECT
208 /** init the capture filter */
211 INITFILTER_BAD_FILTER,
212 INITFILTER_OTHER_ERROR
213 } initfilter_status_t;
215 typedef struct _pcap_options {
219 #ifdef MUST_DO_SELECT
220 int pcap_fd; /* pcap file descriptor */
227 /* capture pipe (unix only "input file") */
228 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
229 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
230 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
232 HANDLE cap_pipe_h; /* The handle of the capture pipe */
234 int cap_pipe_fd; /* the file descriptor of the capture pipe */
236 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
237 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
239 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
241 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
242 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
244 STATE_EXPECT_REC_HDR,
249 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
251 GMutex *cap_pipe_read_mtx;
252 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
256 typedef struct _loop_data {
258 gboolean go; /* TRUE as long as we're supposed to keep capturing */
259 int err; /* if non-zero, error seen while capturing */
260 gint packet_count; /* Number of packets we have already captured */
261 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
262 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
264 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
271 guint32 autostop_files;
274 typedef struct _pcap_queue_element {
275 pcap_options *pcap_opts;
276 struct pcap_pkthdr phdr;
278 } pcap_queue_element;
281 * Standard secondary message for unexpected errors.
283 static const char please_report[] =
284 "Please report this to the Wireshark developers.\n"
285 "(This is not a crash; please do not report it as such.)";
288 * This needs to be static, so that the SIGINT handler can clear the "go"
291 static loop_data global_ld;
295 * Timeout, in milliseconds, for reads from the stream of captured packets
296 * from a capture device.
298 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
299 * 64-bit applications, with sub-second timeouts not to work. The bug is
300 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
302 #if defined(__APPLE__) && defined(__LP64__)
303 static gboolean need_timeout_workaround;
305 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
307 #define CAP_READ_TIMEOUT 250
311 * Timeout, in microseconds, for reads from the stream of captured packets
312 * from a pipe. Pipes don't have the same problem that BPF devices do
313 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
314 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
315 * of the offending versions of Snow Leopard.
317 * On Windows this value is converted to milliseconds and passed to
318 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
319 * will return immediately.
322 #define PIPE_READ_TIMEOUT 100000
324 #define PIPE_READ_TIMEOUT 250000
327 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
330 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
331 const char *message, gpointer user_data _U_);
333 /* capture related options */
334 static capture_options global_capture_opts;
335 static gboolean quiet = FALSE;
336 static gboolean use_threads = FALSE;
338 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
340 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
342 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
343 int err, gboolean is_close);
345 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
347 static void report_new_capture_file(const char *filename);
348 static void report_packet_count(int packet_count);
349 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
350 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
351 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
353 #define MSG_MAX_LENGTH 4096
356 print_usage(gboolean print_ver)
363 "Dumpcap " VERSION "%s\n"
364 "Capture network packets and dump them into a libpcap file.\n"
365 "See http://www.wireshark.org for more information.\n",
366 wireshark_svnversion);
370 fprintf(output, "\nUsage: dumpcap [options] ...\n");
371 fprintf(output, "\n");
372 fprintf(output, "Capture interface:\n");
373 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
374 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
375 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
376 fprintf(output, " -p don't capture in promiscuous mode\n");
377 #ifdef HAVE_PCAP_CREATE
378 fprintf(output, " -I capture in monitor mode, if available\n");
380 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
381 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
383 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
384 fprintf(output, " -D print list of interfaces and exit\n");
385 fprintf(output, " -L print list of link-layer types of iface and exit\n");
386 #ifdef HAVE_BPF_IMAGE
387 fprintf(output, " -d print generated BPF code for capture filter\n");
389 fprintf(output, " -S print statistics for each interface once per second\n");
390 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
391 fprintf(output, "\n");
392 #ifdef HAVE_PCAP_REMOTE
393 fprintf(output, "RPCAP options:\n");
394 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
395 fprintf(output, " -u use UDP for RPCAP data transfer\n");
396 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
397 #ifdef HAVE_PCAP_SETSAMPLING
398 fprintf(output, " -m <sampling type> use packet sampling\n");
399 fprintf(output, " count:NUM - capture one packet of every NUM\n");
400 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
403 fprintf(output, "Stop conditions:\n");
404 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
405 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
406 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
407 fprintf(output, " files:NUM - stop after NUM files\n");
408 /*fprintf(output, "\n");*/
409 fprintf(output, "Output (files):\n");
410 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
411 fprintf(output, " -g enable group read access on the output file(s)\n");
412 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
413 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
414 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
415 fprintf(output, " -n use pcapng format instead of pcap\n");
416 fprintf(output, "\n");
417 fprintf(output, "Miscellaneous:\n");
418 fprintf(output, " -t use a separate thread per interface\n");
419 fprintf(output, " -q don't report packet capture counts\n");
420 fprintf(output, " -v print version information and exit\n");
421 fprintf(output, " -h display this help and exit\n");
422 fprintf(output, "\n");
423 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
424 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
425 fprintf(output, "\n");
426 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
430 show_version(GString *comp_info_str, GString *runtime_info_str)
433 "Dumpcap " VERSION "%s\n"
438 "See http://www.wireshark.org for more information.\n",
439 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
443 * Print to the standard error. This is a command-line tool, so there's
444 * no need to pop up a console.
447 vfprintf_stderr(const char *fmt, va_list ap)
449 vfprintf(stderr, fmt, ap);
453 fprintf_stderr(const char *fmt, ...)
458 vfprintf_stderr(fmt, ap);
463 * Report an error in command-line arguments.
466 cmdarg_err(const char *fmt, ...)
472 /* Generate a 'special format' message back to parent */
474 msg = g_strdup_vprintf(fmt, ap);
475 sync_pipe_errmsg_to_parent(2, msg, "");
480 fprintf(stderr, "dumpcap: ");
481 vfprintf(stderr, fmt, ap);
482 fprintf(stderr, "\n");
488 * Report additional information for an error in command-line arguments.
491 cmdarg_err_cont(const char *fmt, ...)
498 msg = g_strdup_vprintf(fmt, ap);
499 sync_pipe_errmsg_to_parent(2, msg, "");
504 vfprintf(stderr, fmt, ap);
505 fprintf(stderr, "\n");
512 #if 0 /* Set to enable capability debugging */
513 /* see 'man cap_to_text()' for explanation of output */
514 /* '=' means 'all= ' ie: no capabilities */
515 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
517 print_caps(const char *pfx) {
518 cap_t caps = cap_get_proc();
519 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
520 "%s: EUID: %d Capabilities: %s", pfx,
521 geteuid(), cap_to_text(caps, NULL));
524 print_caps(const char *pfx _U_) {
529 relinquish_all_capabilities(void)
531 /* Drop any and all capabilities this process may have. */
532 /* Allowed whether or not process has any privileges. */
533 cap_t caps = cap_init(); /* all capabilities initialized to off */
534 print_caps("Pre-clear");
535 if (cap_set_proc(caps)) {
536 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
538 print_caps("Post-clear");
544 open_capture_device(interface_options *interface_opts,
545 char (*open_err_str)[PCAP_ERRBUF_SIZE])
548 #ifdef HAVE_PCAP_CREATE
551 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
552 struct pcap_rmtauth auth;
555 /* Open the network interface to capture from it.
556 Some versions of libpcap may put warnings into the error buffer
557 if they succeed; to tell if that's happened, we have to clear
558 the error buffer, and check if it's still a null string. */
559 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Entering open_capture_device().");
560 (*open_err_str)[0] = '\0';
561 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
563 * If we're opening a remote device, use pcap_open(); that's currently
564 * the only open routine that supports remote devices.
566 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
567 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
568 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
569 auth.username = interface_opts->auth_username;
570 auth.password = interface_opts->auth_password;
572 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
573 "Calling pcap_open() using name %s, snaplen %d, promisc_mode %d, datatx_udp %d, nocap_rpcap %d.",
574 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode,
575 interface_opts->datatx_udp, interface_opts->nocap_rpcap);
576 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
578 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
579 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
580 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
581 CAP_READ_TIMEOUT, &auth, *open_err_str);
582 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
583 "pcap_open() returned %p.", (void *)pcap_h);
588 * If we're not opening a remote device, use pcap_create() and
589 * pcap_activate() if we have them, so that we can set the buffer
590 * size, otherwise use pcap_open_live().
592 #ifdef HAVE_PCAP_CREATE
593 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
594 "Calling pcap_create() using %s.", interface_opts->name);
595 pcap_h = pcap_create(interface_opts->name, *open_err_str);
596 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
597 "pcap_create() returned %p.", (void *)pcap_h);
598 if (pcap_h != NULL) {
599 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
600 "Calling pcap_set_snaplen() with snaplen %d.", interface_opts->snaplen);
601 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
602 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
603 "Calling pcap_set_snaplen() with promisc_mode %d.", interface_opts->promisc_mode);
604 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
605 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
607 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
608 "buffersize %d.", interface_opts->buffer_size);
609 if (interface_opts->buffer_size > 1) {
610 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
612 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
613 "monitor_mode %d.", interface_opts->monitor_mode);
614 if (interface_opts->monitor_mode)
615 pcap_set_rfmon(pcap_h, 1);
616 err = pcap_activate(pcap_h);
617 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
618 "pcap_activate() returned %d.", err);
620 /* Failed to activate, set to NULL */
621 if (err == PCAP_ERROR)
622 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
624 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
630 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
631 "pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
632 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode);
633 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
634 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
636 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
637 "pcap_open_live() returned %p.", (void *)pcap_h);
640 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
645 get_capture_device_open_failure_messages(const char *open_err_str,
651 char *errmsg, size_t errmsg_len,
652 char *secondary_errmsg,
653 size_t secondary_errmsg_len)
655 const char *libpcap_warn;
656 static const char ppamsg[] = "can't find PPA for ";
658 /* If we got a "can't find PPA for X" message, warn the user (who
659 is running dumcap on HP-UX) that they don't have a version of
660 libpcap that properly handles HP-UX (libpcap 0.6.x and later
661 versions, which properly handle HP-UX, say "can't find /dev/dlpi
662 PPA for X" rather than "can't find PPA for X"). */
663 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
666 "You are running (T)Wireshark with a version of the libpcap library\n"
667 "that doesn't handle HP-UX network devices well; this means that\n"
668 "(T)Wireshark may not be able to capture packets.\n"
670 "To fix this, you should install libpcap 0.6.2, or a later version\n"
671 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
672 "packaged binary form from the Software Porting And Archive Centre\n"
673 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
674 "at the URL lists a number of mirror sites.";
677 g_snprintf(errmsg, (gulong) errmsg_len,
678 "The capture session could not be initiated (%s).", open_err_str);
680 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
681 "Please check to make sure you have sufficient permissions, and that you have "
682 "the proper interface or pipe specified.%s", libpcap_warn);
684 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
686 "Please check that \"%s\" is the proper interface.\n"
689 "Help can be found at:\n"
691 " http://wiki.wireshark.org/WinPcap\n"
692 " http://wiki.wireshark.org/CaptureSetup\n",
697 /* Set the data link type on a pcap. */
699 set_pcap_linktype(pcap_t *pcap_h, int linktype,
700 #ifdef HAVE_PCAP_SET_DATALINK
705 char *errmsg, size_t errmsg_len,
706 char *secondary_errmsg, size_t secondary_errmsg_len)
708 char *set_linktype_err_str;
711 return TRUE; /* just use the default */
712 #ifdef HAVE_PCAP_SET_DATALINK
713 if (pcap_set_datalink(pcap_h, linktype) == 0)
714 return TRUE; /* no error */
715 set_linktype_err_str = pcap_geterr(pcap_h);
717 /* Let them set it to the type it is; reject any other request. */
718 if (get_pcap_linktype(pcap_h, name) == linktype)
719 return TRUE; /* no error */
720 set_linktype_err_str =
721 "That DLT isn't one of the DLTs supported by this device";
723 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
724 set_linktype_err_str);
726 * If the error isn't "XXX is not one of the DLTs supported by this device",
727 * tell the user to tell the Wireshark developers about it.
729 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
730 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
732 secondary_errmsg[0] = '\0';
737 compile_capture_filter(const char *iface, pcap_t *pcap_h,
738 struct bpf_program *fcode, const char *cfilter)
740 bpf_u_int32 netnum, netmask;
741 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
743 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
745 * Well, we can't get the netmask for this interface; it's used
746 * only for filters that check for broadcast IP addresses, so
747 * we just punt and use 0. It might be nice to warn the user,
748 * but that's a pain in a GUI application, as it'd involve popping
749 * up a message box, and it's not clear how often this would make
750 * a difference (only filters that check for IP broadcast addresses
754 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
759 * Sigh. Older versions of libpcap don't properly declare the
760 * third argument to pcap_compile() as a const pointer. Cast
763 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
768 #ifdef HAVE_BPF_IMAGE
770 show_filter_code(capture_options *capture_opts)
772 interface_options interface_opts;
774 gchar open_err_str[PCAP_ERRBUF_SIZE];
775 char errmsg[MSG_MAX_LENGTH+1];
776 char secondary_errmsg[MSG_MAX_LENGTH+1];
777 struct bpf_program fcode;
778 struct bpf_insn *insn;
782 for (j = 0; j < capture_opts->ifaces->len; j++) {
783 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
784 pcap_h = open_capture_device(&interface_opts, &open_err_str);
785 if (pcap_h == NULL) {
786 /* Open failed; get messages */
787 get_capture_device_open_failure_messages(open_err_str,
789 errmsg, sizeof errmsg,
791 sizeof secondary_errmsg);
792 /* And report them */
793 report_capture_error(errmsg, secondary_errmsg);
797 /* Set the link-layer type. */
798 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
799 errmsg, sizeof errmsg,
800 secondary_errmsg, sizeof secondary_errmsg)) {
802 report_capture_error(errmsg, secondary_errmsg);
806 /* OK, try to compile the capture filter. */
807 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
808 interface_opts.cfilter)) {
810 report_cfilter_error(capture_opts, j, errmsg);
815 /* Now print the filter code. */
816 insn = fcode.bf_insns;
818 for (i = 0; i < fcode.bf_len; insn++, i++)
819 printf("%s\n", bpf_image(insn, i));
821 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
822 /* to remove any suid privileges. */
823 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
824 /* (euid/egid have already previously been set to ruid/rgid. */
825 /* (See comment in main() for details) */
827 relinquish_special_privs_perm();
829 relinquish_all_capabilities();
832 /* Let our parent know we succeeded. */
833 pipe_write_block(2, SP_SUCCESS, NULL);
840 * capture_interface_list() is expected to do the right thing to get
841 * a list of interfaces.
843 * In most of the programs in the Wireshark suite, "the right thing"
844 * is to run dumpcap and ask it for the list, because dumpcap may
845 * be the only program in the suite with enough privileges to get
848 * In dumpcap itself, however, we obviously can't run dumpcap to
849 * ask for the list. Therefore, our capture_interface_list() should
850 * just call get_interface_list().
853 capture_interface_list(int *err, char **err_str)
855 return get_interface_list(err, err_str);
859 * Get the data-link type for a libpcap device.
860 * This works around AIX 5.x's non-standard and incompatible-with-the-
861 * rest-of-the-universe libpcap.
864 get_pcap_linktype(pcap_t *pch, const char *devname
872 const char *ifacename;
875 linktype = pcap_datalink(pch);
879 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
880 * rather than DLT_ values for link-layer types; the ifType values
881 * for LAN devices are:
888 * and the ifType value for a loopback device is 24.
890 * The AIX names for LAN devices begin with:
897 * and the AIX names for loopback devices begin with "lo".
899 * (The difference between "Ethernet" and "802.3" is presumably
900 * whether packets have an Ethernet header, with a packet type,
901 * or an 802.3 header, with a packet length, followed by an 802.2
902 * header and possibly a SNAP header.)
904 * If the device name matches "linktype" interpreted as an ifType
905 * value, rather than as a DLT_ value, we will assume this is AIX's
906 * non-standard, incompatible libpcap, rather than a standard libpcap,
907 * and will map the link-layer type to the standard DLT_ value for
908 * that link-layer type, as that's what the rest of Wireshark expects.
910 * (This means the capture files won't be readable by a tcpdump
911 * linked with AIX's non-standard libpcap, but so it goes. They
912 * *will* be readable by standard versions of tcpdump, Wireshark,
915 * XXX - if we conclude we're using AIX libpcap, should we also
916 * set a flag to cause us to assume the time stamps are in
917 * seconds-and-nanoseconds form, and to convert them to
918 * seconds-and-microseconds form before processing them and
923 * Find the last component of the device name, which is the
926 ifacename = strchr(devname, '/');
927 if (ifacename == NULL)
930 /* See if it matches any of the LAN device names. */
931 if (strncmp(ifacename, "en", 2) == 0) {
934 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
938 } else if (strncmp(ifacename, "et", 2) == 0) {
941 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
942 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
947 } else if (strncmp(ifacename, "tr", 2) == 0) {
950 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
951 * DLT_IEEE802, which is what's used for Token Ring.
955 } else if (strncmp(ifacename, "fi", 2) == 0) {
956 if (linktype == 15) {
958 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
962 } else if (strncmp(ifacename, "lo", 2) == 0) {
963 if (linktype == 24) {
965 * That's the RFC 1573 value for "software loopback" devices; map it
966 * to DLT_NULL, which is what's used for loopback devices on BSD.
976 static data_link_info_t *
977 create_data_link_info(int dlt)
979 data_link_info_t *data_link_info;
982 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
983 data_link_info->dlt = dlt;
984 text = pcap_datalink_val_to_name(dlt);
986 data_link_info->name = g_strdup(text);
988 data_link_info->name = g_strdup_printf("DLT %d", dlt);
989 text = pcap_datalink_val_to_description(dlt);
991 data_link_info->description = g_strdup(text);
993 data_link_info->description = NULL;
994 return data_link_info;
998 * Get the capabilities of a network device.
1000 static if_capabilities_t *
1001 get_if_capabilities(const char *devname, gboolean monitor_mode
1002 #ifndef HAVE_PCAP_CREATE
1007 if_capabilities_t *caps;
1008 char errbuf[PCAP_ERRBUF_SIZE];
1010 #ifdef HAVE_PCAP_CREATE
1014 #ifdef HAVE_PCAP_LIST_DATALINKS
1018 data_link_info_t *data_link_info;
1021 * Allocate the interface capabilities structure.
1023 caps = g_malloc(sizeof *caps);
1025 #ifdef HAVE_PCAP_OPEN
1026 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1027 caps->can_set_rfmon = FALSE;
1029 if (err_str != NULL)
1030 *err_str = g_strdup(errbuf);
1034 #elif defined(HAVE_PCAP_CREATE)
1035 pch = pcap_create(devname, errbuf);
1037 if (err_str != NULL)
1038 *err_str = g_strdup(errbuf);
1042 status = pcap_can_set_rfmon(pch);
1045 if (status == PCAP_ERROR)
1046 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1049 *err_str = g_strdup(pcap_statustostr(status));
1055 caps->can_set_rfmon = FALSE;
1056 else if (status == 1) {
1057 caps->can_set_rfmon = TRUE;
1059 pcap_set_rfmon(pch, 1);
1061 if (err_str != NULL) {
1062 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1070 status = pcap_activate(pch);
1072 /* Error. We ignore warnings (status > 0). */
1073 if (err_str != NULL) {
1074 if (status == PCAP_ERROR)
1075 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1078 *err_str = g_strdup(pcap_statustostr(status));
1085 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1086 caps->can_set_rfmon = FALSE;
1088 if (err_str != NULL)
1089 *err_str = g_strdup(errbuf);
1094 deflt = get_pcap_linktype(pch, devname);
1095 #ifdef HAVE_PCAP_LIST_DATALINKS
1096 nlt = pcap_list_datalinks(pch, &linktypes);
1097 if (nlt == 0 || linktypes == NULL) {
1099 if (err_str != NULL)
1100 *err_str = NULL; /* an empty list doesn't mean an error */
1103 caps->data_link_types = NULL;
1104 for (i = 0; i < nlt; i++) {
1105 data_link_info = create_data_link_info(linktypes[i]);
1108 * XXX - for 802.11, make the most detailed 802.11
1109 * version the default, rather than the one the
1110 * device has as the default?
1112 if (linktypes[i] == deflt)
1113 caps->data_link_types = g_list_prepend(caps->data_link_types,
1116 caps->data_link_types = g_list_append(caps->data_link_types,
1119 #ifdef HAVE_PCAP_FREE_DATALINKS
1120 pcap_free_datalinks(linktypes);
1123 * In Windows, there's no guarantee that if you have a library
1124 * built with one version of the MSVC++ run-time library, and
1125 * it returns a pointer to allocated data, you can free that
1126 * data from a program linked with another version of the
1127 * MSVC++ run-time library.
1129 * This is not an issue on UN*X.
1131 * See the mail threads starting at
1133 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1137 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1140 #define xx_free free /* hack so checkAPIs doesn't complain */
1143 #endif /* HAVE_PCAP_FREE_DATALINKS */
1144 #else /* HAVE_PCAP_LIST_DATALINKS */
1146 data_link_info = create_data_link_info(deflt);
1147 caps->data_link_types = g_list_append(caps->data_link_types,
1149 #endif /* HAVE_PCAP_LIST_DATALINKS */
1153 if (err_str != NULL)
1158 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1160 print_machine_readable_interfaces(GList *if_list)
1167 char addr_str[ADDRSTRLEN];
1169 if (capture_child) {
1170 /* Let our parent know we succeeded. */
1171 pipe_write_block(2, SP_SUCCESS, NULL);
1174 i = 1; /* Interface id number */
1175 for (if_entry = g_list_first(if_list); if_entry != NULL;
1176 if_entry = g_list_next(if_entry)) {
1177 if_info = (if_info_t *)if_entry->data;
1178 printf("%d. %s", i++, if_info->name);
1181 * Print the contents of the if_entry struct in a parseable format.
1182 * Each if_entry element is tab-separated. Addresses are comma-
1185 /* XXX - Make sure our description doesn't contain a tab */
1186 if (if_info->description != NULL)
1187 printf("\t%s\t", if_info->description);
1191 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1192 addr = g_slist_next(addr)) {
1193 if (addr != g_slist_nth(if_info->addrs, 0))
1196 if_addr = (if_addr_t *)addr->data;
1197 switch(if_addr->ifat_type) {
1199 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1201 printf("%s", addr_str);
1203 printf("<unknown IPv4>");
1207 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1208 addr_str, ADDRSTRLEN)) {
1209 printf("%s", addr_str);
1211 printf("<unknown IPv6>");
1215 printf("<type unknown %u>", if_addr->ifat_type);
1219 if (if_info->loopback)
1220 printf("\tloopback");
1222 printf("\tnetwork");
1229 * If you change the machine-readable output format of this function,
1230 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1233 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1236 data_link_info_t *data_link_info;
1237 const gchar *desc_str;
1239 if (capture_child) {
1240 /* Let our parent know we succeeded. */
1241 pipe_write_block(2, SP_SUCCESS, NULL);
1244 if (caps->can_set_rfmon)
1248 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1249 lt_entry = g_list_next(lt_entry)) {
1250 data_link_info = (data_link_info_t *)lt_entry->data;
1251 if (data_link_info->description != NULL)
1252 desc_str = data_link_info->description;
1254 desc_str = "(not supported)";
1255 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1265 /* Print the number of packets captured for each interface until we're killed. */
1267 print_statistics_loop(gboolean machine_readable)
1269 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1275 char errbuf[PCAP_ERRBUF_SIZE];
1276 struct pcap_stat ps;
1278 if_list = get_interface_list(&err, &err_str);
1279 if (if_list == NULL) {
1281 case CANT_GET_INTERFACE_LIST:
1282 cmdarg_err("%s", err_str);
1286 case NO_INTERFACES_FOUND:
1287 cmdarg_err("There are no interfaces on which a capture can be done");
1293 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1294 if_info = (if_info_t *)if_entry->data;
1295 #ifdef HAVE_PCAP_OPEN
1296 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1298 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1302 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1303 if_stat->name = g_strdup(if_info->name);
1305 stat_list = g_list_append(stat_list, if_stat);
1310 cmdarg_err("There are no interfaces on which a capture can be done");
1314 if (capture_child) {
1315 /* Let our parent know we succeeded. */
1316 pipe_write_block(2, SP_SUCCESS, NULL);
1319 if (!machine_readable) {
1320 printf("%-15s %10s %10s\n", "Interface", "Received",
1324 global_ld.go = TRUE;
1325 while (global_ld.go) {
1326 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1327 if_stat = (if_stat_t *)stat_entry->data;
1328 pcap_stats(if_stat->pch, &ps);
1330 if (!machine_readable) {
1331 printf("%-15s %10u %10u\n", if_stat->name,
1332 ps.ps_recv, ps.ps_drop);
1334 printf("%s\t%u\t%u\n", if_stat->name,
1335 ps.ps_recv, ps.ps_drop);
1346 /* XXX - Not reached. Should we look for 'q' in stdin? */
1347 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1348 if_stat = (if_stat_t *)stat_entry->data;
1349 pcap_close(if_stat->pch);
1350 g_free(if_stat->name);
1353 g_list_free(stat_list);
1354 free_interface_list(if_list);
1362 capture_cleanup_handler(DWORD dwCtrlType)
1364 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1365 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1366 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1367 like SIGTERM at least when the machine's shutting down.
1369 For now, if we're running as a command rather than a capture child,
1370 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1371 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1372 in that way on UN*X.
1374 If we're not running as a capture child, we might be running as
1375 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1376 user logs out. (XXX - can we explicitly check whether we're
1377 running as a service?) */
1379 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1380 "Console: Control signal");
1381 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1382 "Console: Control signal, CtrlType: %u", dwCtrlType);
1384 /* Keep capture running if we're a service and a user logs off */
1385 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1386 capture_loop_stop();
1394 capture_cleanup_handler(int signum _U_)
1396 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1397 SIGTERM. We assume that if the user wanted it to keep running
1398 after they logged out, they'd have nohupped it. */
1400 /* Note: don't call g_log() in the signal handler: if we happened to be in
1401 * g_log() in process context when the signal came in, g_log will detect
1402 * the "recursion" and abort.
1405 capture_loop_stop();
1411 report_capture_count(gboolean reportit)
1413 /* Don't print this if we're a capture child. */
1414 if (!capture_child && reportit) {
1415 fprintf(stderr, "\rPackets captured: %u\n", global_ld.packet_count);
1416 /* stderr could be line buffered */
1424 report_counts_for_siginfo(void)
1426 report_capture_count(quiet);
1427 infoprint = FALSE; /* we just reported it */
1431 report_counts_siginfo(int signum _U_)
1433 int sav_errno = errno;
1435 /* If we've been told to delay printing, just set a flag asking
1436 that we print counts (if we're supposed to), otherwise print
1437 the count of packets captured (if we're supposed to). */
1441 report_counts_for_siginfo();
1444 #endif /* SIGINFO */
1447 exit_main(int status)
1450 /* Shutdown windows sockets */
1453 /* can be helpful for debugging */
1454 #ifdef DEBUG_DUMPCAP
1455 printf("Press any key\n");
1466 * If we were linked with libcap (not libpcap), make sure we have
1467 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1468 * (See comment in main() for details)
1471 relinquish_privs_except_capture(void)
1473 /* If 'started_with_special_privs' (ie: suid) then enable for
1474 * ourself the NET_ADMIN and NET_RAW capabilities and then
1475 * drop our suid privileges.
1477 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1478 * stuff we don't need (and shouldn't have).
1479 * CAP_NET_RAW: Packet capture (raw sockets).
1482 if (started_with_special_privs()) {
1483 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1484 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1486 cap_t caps = cap_init(); /* all capabilities initialized to off */
1488 print_caps("Pre drop, pre set");
1490 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1491 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1494 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1495 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1497 if (cap_set_proc(caps)) {
1498 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1500 print_caps("Pre drop, post set");
1502 relinquish_special_privs_perm();
1504 print_caps("Post drop, pre set");
1505 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1506 if (cap_set_proc(caps)) {
1507 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1509 print_caps("Post drop, post set");
1515 #endif /* HAVE_LIBCAP */
1517 /* Take care of byte order in the libpcap headers read from pipes.
1518 * (function taken from wiretap/libpcap.c) */
1520 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1523 /* Byte-swap the record header fields. */
1524 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1525 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1526 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1527 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1530 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1531 swapped, in order to match the BPF header layout.
1533 Unfortunately, some files were, according to a comment in the "libpcap"
1534 source, written with version 2.3 in their headers but without the
1535 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1536 would make no sense - we assume that we need to swap them. */
1537 if (hdr->version_major == 2 &&
1538 (hdr->version_minor < 3 ||
1539 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1542 temp = rechdr->orig_len;
1543 rechdr->orig_len = rechdr->incl_len;
1544 rechdr->incl_len = temp;
1550 * Thread function that reads from a pipe and pushes the data
1551 * to the main application thread.
1554 * XXX Right now we use async queues for basic signaling. The main thread
1555 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1556 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1557 * Iff the read is successful cap_pipe_read pushes an item onto
1558 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1559 * the queues themselves (yet).
1561 * We might want to move some of the cap_pipe_dispatch logic here so that
1562 * we can let cap_pipe_read run independently, queuing up multiple reads
1563 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1565 static void *cap_pipe_read(void *arg)
1567 pcap_options *pcap_opts;
1576 pcap_opts = (pcap_options *)arg;
1577 while (pcap_opts->cap_pipe_err == PIPOK) {
1578 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1579 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1581 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1583 /* If we try to use read() on a named pipe on Windows with partial
1584 * data it appears to return EOF.
1586 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1587 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1592 last_err = GetLastError();
1593 if (last_err == ERROR_MORE_DATA) {
1595 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1596 pcap_opts->cap_pipe_err = PIPEOF;
1600 pcap_opts->cap_pipe_err = PIPERR;
1603 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1604 pcap_opts->cap_pipe_err = PIPEOF;
1609 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1610 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1613 pcap_opts->cap_pipe_err = PIPEOF;
1617 pcap_opts->cap_pipe_err = PIPERR;
1626 pcap_opts->cap_pipe_bytes_read = bytes_read;
1627 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1628 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1630 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1636 #if !defined(_WIN32) || defined(MUST_DO_SELECT)
1637 /* Provide select() functionality for a single file descriptor
1638 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1640 * Returns the same values as select.
1643 cap_pipe_select(int pipe_fd)
1646 struct timeval timeout;
1649 FD_SET(pipe_fd, &rfds);
1651 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1652 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1654 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1659 /* Mimic pcap_open_live() for pipe captures
1661 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1662 * open it, and read the header.
1664 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1665 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1667 cap_pipe_open_live(char *pipename,
1668 pcap_options *pcap_opts,
1669 struct pcap_hdr *hdr,
1670 char *errmsg, int errmsgl)
1673 ws_statb64 pipe_stat;
1674 struct sockaddr_un sa;
1685 unsigned int bytes_read;
1690 pcap_opts->cap_pipe_fd = -1;
1692 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1694 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1697 * XXX - this blocks until a pcap per-file header has been written to
1698 * the pipe, so it could block indefinitely.
1700 if (strcmp(pipename, "-") == 0) {
1702 fd = 0; /* read from stdin */
1704 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1708 if (ws_stat64(pipename, &pipe_stat) < 0) {
1709 if (errno == ENOENT || errno == ENOTDIR)
1710 pcap_opts->cap_pipe_err = PIPNEXIST;
1712 g_snprintf(errmsg, errmsgl,
1713 "The capture session could not be initiated "
1714 "due to error getting information on pipe/socket: %s", g_strerror(errno));
1715 pcap_opts->cap_pipe_err = PIPERR;
1719 if (S_ISFIFO(pipe_stat.st_mode)) {
1720 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1722 g_snprintf(errmsg, errmsgl,
1723 "The capture session could not be initiated "
1724 "due to error on pipe open: %s", g_strerror(errno));
1725 pcap_opts->cap_pipe_err = PIPERR;
1728 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1729 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1731 g_snprintf(errmsg, errmsgl,
1732 "The capture session could not be initiated "
1733 "due to error on socket create: %s", g_strerror(errno));
1734 pcap_opts->cap_pipe_err = PIPERR;
1737 sa.sun_family = AF_UNIX;
1739 * The Single UNIX Specification says:
1741 * The size of sun_path has intentionally been left undefined.
1742 * This is because different implementations use different sizes.
1743 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1744 * of 104. Since most implementations originate from BSD versions,
1745 * the size is typically in the range 92 to 108.
1747 * Applications should not assume a particular length for sun_path
1748 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1752 * The <sys/un.h> header shall define the sockaddr_un structure,
1753 * which shall include at least the following members:
1755 * sa_family_t sun_family Address family.
1756 * char sun_path[] Socket pathname.
1758 * so we assume that it's an array, with a specified size,
1759 * and that the size reflects the maximum path length.
1761 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1762 /* Path name too long */
1763 g_snprintf(errmsg, errmsgl,
1764 "The capture session coud not be initiated "
1765 "due to error on socket connect: Path name too long");
1766 pcap_opts->cap_pipe_err = PIPERR;
1769 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1771 g_snprintf(errmsg, errmsgl,
1772 "The capture session coud not be initiated "
1773 "due to error on socket connect: %s", g_strerror(errno));
1774 pcap_opts->cap_pipe_err = PIPERR;
1778 if (S_ISCHR(pipe_stat.st_mode)) {
1780 * Assume the user specified an interface on a system where
1781 * interfaces are in /dev. Pretend we haven't seen it.
1783 pcap_opts->cap_pipe_err = PIPNEXIST;
1786 g_snprintf(errmsg, errmsgl,
1787 "The capture session could not be initiated because\n"
1788 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1789 pcap_opts->cap_pipe_err = PIPERR;
1794 #define PIPE_STR "\\pipe\\"
1795 /* Under Windows, named pipes _must_ have the form
1796 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1798 pncopy = g_strdup(pipename);
1799 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1800 pos = strchr(pncopy + 3, '\\');
1801 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1808 g_snprintf(errmsg, errmsgl,
1809 "The capture session could not be initiated because\n"
1810 "\"%s\" is neither an interface nor a pipe", pipename);
1811 pcap_opts->cap_pipe_err = PIPNEXIST;
1815 /* Wait for the pipe to appear */
1817 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1818 OPEN_EXISTING, 0, NULL);
1820 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1823 if (GetLastError() != ERROR_PIPE_BUSY) {
1824 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1825 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1826 g_snprintf(errmsg, errmsgl,
1827 "The capture session on \"%s\" could not be started "
1828 "due to error on pipe open: %s (error %d)",
1829 pipename, utf_16to8(err_str), GetLastError());
1831 pcap_opts->cap_pipe_err = PIPERR;
1835 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1836 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1837 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1838 g_snprintf(errmsg, errmsgl,
1839 "The capture session on \"%s\" timed out during "
1840 "pipe open: %s (error %d)",
1841 pipename, utf_16to8(err_str), GetLastError());
1843 pcap_opts->cap_pipe_err = PIPERR;
1850 pcap_opts->from_cap_pipe = TRUE;
1853 /* read the pcap header */
1855 while (bytes_read < sizeof magic) {
1856 sel_ret = cap_pipe_select(fd);
1858 g_snprintf(errmsg, errmsgl,
1859 "Unexpected error from select: %s", g_strerror(errno));
1861 } else if (sel_ret > 0) {
1862 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1865 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1867 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1875 g_thread_create(&cap_pipe_read, pcap_opts, FALSE, NULL);
1877 pcap_opts->cap_pipe_buf = (char *) &magic;
1878 pcap_opts->cap_pipe_bytes_read = 0;
1879 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1880 /* We don't have to worry about cap_pipe_read_mtx here */
1881 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1882 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1883 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1884 if (pcap_opts->cap_pipe_bytes_read == 0)
1885 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1887 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1896 /* Host that wrote it has our byte order, and was running
1897 a program using either standard or ss990417 libpcap. */
1898 pcap_opts->cap_pipe_byte_swapped = FALSE;
1899 pcap_opts->cap_pipe_modified = FALSE;
1901 case PCAP_MODIFIED_MAGIC:
1902 /* Host that wrote it has our byte order, but was running
1903 a program using either ss990915 or ss991029 libpcap. */
1904 pcap_opts->cap_pipe_byte_swapped = FALSE;
1905 pcap_opts->cap_pipe_modified = TRUE;
1907 case PCAP_SWAPPED_MAGIC:
1908 /* Host that wrote it has a byte order opposite to ours,
1909 and was running a program using either standard or
1910 ss990417 libpcap. */
1911 pcap_opts->cap_pipe_byte_swapped = TRUE;
1912 pcap_opts->cap_pipe_modified = FALSE;
1914 case PCAP_SWAPPED_MODIFIED_MAGIC:
1915 /* Host that wrote it out has a byte order opposite to
1916 ours, and was running a program using either ss990915
1917 or ss991029 libpcap. */
1918 pcap_opts->cap_pipe_byte_swapped = TRUE;
1919 pcap_opts->cap_pipe_modified = TRUE;
1922 /* Not a "libpcap" type we know about. */
1923 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1928 /* Read the rest of the header */
1930 while (bytes_read < sizeof(struct pcap_hdr)) {
1931 sel_ret = cap_pipe_select(fd);
1933 g_snprintf(errmsg, errmsgl,
1934 "Unexpected error from select: %s", g_strerror(errno));
1936 } else if (sel_ret > 0) {
1937 b = read(fd, ((char *)hdr)+bytes_read,
1938 sizeof(struct pcap_hdr) - bytes_read);
1941 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1943 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1951 pcap_opts->cap_pipe_buf = (char *) hdr;
1952 pcap_opts->cap_pipe_bytes_read = 0;
1953 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1954 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1955 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1956 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1957 if (pcap_opts->cap_pipe_bytes_read == 0)
1958 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1960 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1966 if (pcap_opts->cap_pipe_byte_swapped) {
1967 /* Byte-swap the header fields about which we care. */
1968 hdr->version_major = BSWAP16(hdr->version_major);
1969 hdr->version_minor = BSWAP16(hdr->version_minor);
1970 hdr->snaplen = BSWAP32(hdr->snaplen);
1971 hdr->network = BSWAP32(hdr->network);
1973 pcap_opts->linktype = hdr->network;
1975 if (hdr->version_major < 2) {
1976 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1980 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1981 pcap_opts->cap_pipe_err = PIPOK;
1983 pcap_opts->cap_pipe_fd = fd;
1988 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1989 pcap_opts->cap_pipe_err = PIPERR;
1992 pcap_opts->cap_pipe_fd = -1;
1999 /* We read one record from the pipe, take care of byte order in the record
2000 * header, write the record to the capture file, and update capture statistics. */
2002 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
2004 struct pcap_pkthdr phdr;
2005 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2017 #ifdef LOG_CAPTURE_VERBOSE
2018 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2021 switch (pcap_opts->cap_pipe_state) {
2023 case STATE_EXPECT_REC_HDR:
2025 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2028 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2029 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2030 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2031 pcap_opts->cap_pipe_bytes_read = 0;
2034 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2035 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2036 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2041 case STATE_READ_REC_HDR:
2043 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2044 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2047 result = PD_PIPE_EOF;
2049 result = PD_PIPE_ERR;
2052 pcap_opts->cap_pipe_bytes_read += b;
2054 g_get_current_time(&wait_time);
2055 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2056 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2057 if (pcap_opts->cap_pipe_err == PIPEOF) {
2058 result = PD_PIPE_EOF;
2060 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2061 result = PD_PIPE_ERR;
2068 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2070 result = PD_REC_HDR_READ;
2073 case STATE_EXPECT_DATA:
2075 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2078 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2079 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2080 pcap_opts->cap_pipe_bytes_read = 0;
2083 pcap_opts->cap_pipe_buf = (char *) data;
2084 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2085 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2090 case STATE_READ_DATA:
2092 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2093 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2096 result = PD_PIPE_EOF;
2098 result = PD_PIPE_ERR;
2101 pcap_opts->cap_pipe_bytes_read += b;
2103 g_get_current_time(&wait_time);
2104 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2105 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2106 if (pcap_opts->cap_pipe_err == PIPEOF) {
2107 result = PD_PIPE_EOF;
2109 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2110 result = PD_PIPE_ERR;
2117 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2119 result = PD_DATA_READ;
2123 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2126 } /* switch (ld->cap_pipe_state) */
2129 * We've now read as much data as we were expecting, so process it.
2133 case PD_REC_HDR_READ:
2134 /* We've read the header. Take care of byte order. */
2135 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2136 &pcap_opts->cap_pipe_rechdr.hdr);
2137 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2138 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2139 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2143 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2144 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2147 /* no data to read? fall through */
2150 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2151 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2152 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2153 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2154 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2157 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2159 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2161 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2165 pcap_opts->cap_pipe_err = PIPEOF;
2170 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2171 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2172 g_snprintf(errmsg, errmsgl,
2173 "Error reading from pipe: %s (error %d)",
2174 utf_16to8(err_str), GetLastError());
2177 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2185 pcap_opts->cap_pipe_err = PIPERR;
2186 /* Return here rather than inside the switch to prevent GCC warning */
2191 /** Open the capture input file (pcap or capture pipe).
2192 * Returns TRUE if it succeeds, FALSE otherwise. */
2194 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2195 char *errmsg, size_t errmsg_len,
2196 char *secondary_errmsg, size_t secondary_errmsg_len)
2198 gchar open_err_str[PCAP_ERRBUF_SIZE];
2199 gchar *sync_msg_str;
2200 interface_options interface_opts;
2201 pcap_options *pcap_opts;
2205 gchar *sync_secondary_msg_str;
2206 WORD wVersionRequested;
2210 /* XXX - opening Winsock on tshark? */
2212 /* Initialize Windows Socket if we are in a WIN32 OS
2213 This needs to be done before querying the interface for network/netmask */
2215 /* XXX - do we really require 1.1 or earlier?
2216 Are there any versions that support only 2.0 or higher? */
2217 wVersionRequested = MAKEWORD(1, 1);
2218 err = WSAStartup(wVersionRequested, &wsaData);
2222 case WSASYSNOTREADY:
2223 g_snprintf(errmsg, (gulong) errmsg_len,
2224 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2227 case WSAVERNOTSUPPORTED:
2228 g_snprintf(errmsg, (gulong) errmsg_len,
2229 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2230 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2233 case WSAEINPROGRESS:
2234 g_snprintf(errmsg, (gulong) errmsg_len,
2235 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2239 g_snprintf(errmsg, (gulong) errmsg_len,
2240 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2244 g_snprintf(errmsg, (gulong) errmsg_len,
2245 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2249 g_snprintf(errmsg, (gulong) errmsg_len,
2250 "Couldn't initialize Windows Sockets: error %d", err);
2253 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2257 if ((use_threads == FALSE) &&
2258 (capture_opts->ifaces->len > 1)) {
2259 g_snprintf(errmsg, (gulong) errmsg_len,
2260 "Using threads is required for capturing on mulitple interfaces!");
2264 for (i = 0; i < capture_opts->ifaces->len; i++) {
2265 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2266 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2267 if (pcap_opts == NULL) {
2268 g_snprintf(errmsg, (gulong) errmsg_len,
2269 "Could not allocate memory.");
2272 pcap_opts->received = 0;
2273 pcap_opts->dropped = 0;
2274 pcap_opts->pcap_h = NULL;
2275 #ifdef MUST_DO_SELECT
2276 pcap_opts->pcap_fd = -1;
2278 pcap_opts->pcap_err = FALSE;
2279 pcap_opts->interface_id = i;
2280 pcap_opts->tid = NULL;
2281 pcap_opts->snaplen = 0;
2282 pcap_opts->linktype = -1;
2283 pcap_opts->from_cap_pipe = FALSE;
2284 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2285 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2287 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2289 pcap_opts->cap_pipe_fd = -1;
2291 pcap_opts->cap_pipe_modified = FALSE;
2292 pcap_opts->cap_pipe_byte_swapped = FALSE;
2294 pcap_opts->cap_pipe_buf = NULL;
2296 pcap_opts->cap_pipe_bytes_to_read = 0;
2297 pcap_opts->cap_pipe_bytes_read = 0;
2298 pcap_opts->cap_pipe_state = 0;
2299 pcap_opts->cap_pipe_err = PIPOK;
2301 #if GLIB_CHECK_VERSION(2,31,0)
2302 pcap_opts->cap_pipe_read_mtx = g_malloc(sizeof(GMutex));
2303 g_mutex_init(pcap_opts->cap_pipe_read_mtx);
2305 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2307 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2308 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2310 g_array_append_val(ld->pcaps, pcap_opts);
2312 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2313 pcap_opts->pcap_h = open_capture_device(&interface_opts, &open_err_str);
2315 if (pcap_opts->pcap_h != NULL) {
2316 /* we've opened "iface" as a network device */
2318 /* try to set the capture buffer size */
2319 if (interface_opts.buffer_size > 1 &&
2320 pcap_setbuff(pcap_opts->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2321 sync_secondary_msg_str = g_strdup_printf(
2322 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2323 "the default of 1MB will be used.\n"
2325 "Nonetheless, the capture is started.\n",
2326 interface_opts.buffer_size);
2327 report_capture_error("Couldn't set the capture buffer size!",
2328 sync_secondary_msg_str);
2329 g_free(sync_secondary_msg_str);
2333 #if defined(HAVE_PCAP_SETSAMPLING)
2334 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2335 struct pcap_samp *samp;
2337 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2338 switch (interface_opts.sampling_method) {
2339 case CAPTURE_SAMP_BY_COUNT:
2340 samp->method = PCAP_SAMP_1_EVERY_N;
2343 case CAPTURE_SAMP_BY_TIMER:
2344 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2348 sync_msg_str = g_strdup_printf(
2349 "Unknown sampling method %d specified,\n"
2350 "continue without packet sampling",
2351 interface_opts.sampling_method);
2352 report_capture_error("Couldn't set the capture "
2353 "sampling", sync_msg_str);
2354 g_free(sync_msg_str);
2356 samp->value = interface_opts.sampling_param;
2358 report_capture_error("Couldn't set the capture sampling",
2359 "Cannot get packet sampling data structure");
2364 /* setting the data link type only works on real interfaces */
2365 if (!set_pcap_linktype(pcap_opts->pcap_h, interface_opts.linktype, interface_opts.name,
2367 secondary_errmsg, secondary_errmsg_len)) {
2370 pcap_opts->linktype = get_pcap_linktype(pcap_opts->pcap_h, interface_opts.name);
2372 /* We couldn't open "iface" as a network device. */
2373 /* Try to open it as a pipe */
2374 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2377 if (pcap_opts->cap_pipe_fd == -1) {
2379 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2381 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2382 /* Pipe doesn't exist, so output message for interface */
2383 get_capture_device_open_failure_messages(open_err_str,
2384 interface_opts.name,
2388 secondary_errmsg_len);
2391 * Else pipe (or file) does exist and cap_pipe_open_live() has
2396 /* cap_pipe_open_live() succeeded; don't want
2397 error message from pcap_open_live() */
2398 open_err_str[0] = '\0';
2402 /* XXX - will this work for tshark? */
2403 #ifdef MUST_DO_SELECT
2404 if (!pcap_opts->from_cap_pipe) {
2405 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2406 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2408 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2413 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2414 returned a warning; print it, but keep capturing. */
2415 if (open_err_str[0] != '\0') {
2416 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2417 report_capture_error(sync_msg_str, "");
2418 g_free(sync_msg_str);
2420 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2421 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2424 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2425 /* to remove any suid privileges. */
2426 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2427 /* (euid/egid have already previously been set to ruid/rgid. */
2428 /* (See comment in main() for details) */
2430 relinquish_special_privs_perm();
2432 relinquish_all_capabilities();
2437 /* close the capture input file (pcap or capture pipe) */
2438 static void capture_loop_close_input(loop_data *ld)
2441 pcap_options *pcap_opts;
2443 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2445 for (i = 0; i < ld->pcaps->len; i++) {
2446 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2447 /* if open, close the capture pipe "input file" */
2449 if (pcap_opts->cap_pipe_fd >= 0) {
2450 g_assert(pcap_opts->from_cap_pipe);
2451 ws_close(pcap_opts->cap_pipe_fd);
2452 pcap_opts->cap_pipe_fd = -1;
2455 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2456 CloseHandle(pcap_opts->cap_pipe_h);
2457 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2460 /* if open, close the pcap "input file" */
2461 if (pcap_opts->pcap_h != NULL) {
2462 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2463 pcap_close(pcap_opts->pcap_h);
2464 pcap_opts->pcap_h = NULL;
2471 /* Shut down windows sockets */
2477 /* init the capture filter */
2478 static initfilter_status_t
2479 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2480 const gchar * name, const gchar * cfilter)
2482 struct bpf_program fcode;
2484 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2486 /* capture filters only work on real interfaces */
2487 if (cfilter && !from_cap_pipe) {
2488 /* A capture filter was specified; set it up. */
2489 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2490 /* Treat this specially - our caller might try to compile this
2491 as a display filter and, if that succeeds, warn the user that
2492 the display and capture filter syntaxes are different. */
2493 return INITFILTER_BAD_FILTER;
2495 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2496 #ifdef HAVE_PCAP_FREECODE
2497 pcap_freecode(&fcode);
2499 return INITFILTER_OTHER_ERROR;
2501 #ifdef HAVE_PCAP_FREECODE
2502 pcap_freecode(&fcode);
2506 return INITFILTER_NO_ERROR;
2510 /* set up to write to the already-opened capture output file/files */
2512 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2516 pcap_options *pcap_opts;
2517 interface_options interface_opts;
2518 gboolean successful;
2520 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2522 if ((capture_opts->use_pcapng == FALSE) &&
2523 (capture_opts->ifaces->len > 1)) {
2524 g_snprintf(errmsg, errmsg_len,
2525 "Using PCAPNG is required for capturing on mulitple interfaces! Use the -n option.");
2529 /* Set up to write to the capture file. */
2530 if (capture_opts->multi_files_on) {
2531 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2533 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2536 if (capture_opts->use_pcapng) {
2539 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2540 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err);
2541 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2542 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2543 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2544 if (pcap_opts->from_cap_pipe) {
2545 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2547 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2549 successful = libpcap_write_interface_description_block(ld->pdh,
2550 interface_opts.name,
2551 interface_opts.cfilter?interface_opts.cfilter:"",
2552 pcap_opts->linktype,
2558 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2559 if (pcap_opts->from_cap_pipe) {
2560 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2562 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2564 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2565 &ld->bytes_written, &err);
2573 if (ld->pdh == NULL) {
2574 /* We couldn't set up to write to the capture file. */
2575 /* XXX - use cf_open_error_message from tshark instead? */
2580 g_snprintf(errmsg, errmsg_len,
2581 "The file to which the capture would be"
2582 " saved (\"%s\") could not be opened: Error %d.",
2583 capture_opts->save_file, err);
2585 g_snprintf(errmsg, errmsg_len,
2586 "The file to which the capture would be"
2587 " saved (\"%s\") could not be opened: %s.",
2588 capture_opts->save_file, g_strerror(err));
2600 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2604 pcap_options *pcap_opts;
2606 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2608 if (capture_opts->multi_files_on) {
2609 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2611 if (capture_opts->use_pcapng) {
2612 for (i = 0; i < global_ld.pcaps->len; i++) {
2613 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2614 if (!pcap_opts->from_cap_pipe) {
2615 libpcap_write_interface_statistics_block(ld->pdh, i, pcap_opts->pcap_h, &ld->bytes_written, err_close);
2619 return libpcap_dump_close(ld->pdh, err_close);
2623 /* dispatch incoming packets (pcap or capture pipe)
2625 * Waits for incoming packets to be available, and calls pcap_dispatch()
2626 * to cause them to be processed.
2628 * Returns the number of packets which were processed.
2630 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2631 * packet-batching behaviour does not cause packets to get held back
2635 capture_loop_dispatch(loop_data *ld,
2636 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2639 gint packet_count_before;
2640 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2645 packet_count_before = ld->packet_count;
2646 if (pcap_opts->from_cap_pipe) {
2647 /* dispatch from capture pipe */
2648 #ifdef LOG_CAPTURE_VERBOSE
2649 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from capture pipe");
2652 sel_ret = cap_pipe_select(pcap_opts->cap_pipe_fd);
2654 if (sel_ret < 0 && errno != EINTR) {
2655 g_snprintf(errmsg, errmsg_len,
2656 "Unexpected error from select: %s", g_strerror(errno));
2657 report_capture_error(errmsg, please_report);
2662 * "select()" says we can read from the pipe without blocking
2665 inpkts = cap_pipe_dispatch(ld, pcap_opts, pcap_data, errmsg, errmsg_len);
2675 /* dispatch from pcap */
2676 #ifdef MUST_DO_SELECT
2678 * If we have "pcap_get_selectable_fd()", we use it to get the
2679 * descriptor on which to select; if that's -1, it means there
2680 * is no descriptor on which you can do a "select()" (perhaps
2681 * because you're capturing on a special device, and that device's
2682 * driver unfortunately doesn't support "select()", in which case
2683 * we don't do the select - which means it might not be possible
2684 * to stop a capture until a packet arrives. If that's unacceptable,
2685 * plead with whoever supplies the software for that device to add
2686 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2687 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2688 * later, so it can use pcap_breakloop().
2690 #ifdef LOG_CAPTURE_VERBOSE
2691 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2693 if (pcap_opts->pcap_fd != -1) {
2694 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2697 * "select()" says we can read from it without blocking; go for
2700 * We don't have pcap_breakloop(), so we only process one packet
2701 * per pcap_dispatch() call, to allow a signal to stop the
2702 * processing immediately, rather than processing all packets
2703 * in a batch before quitting.
2706 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2708 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2712 /* Error, rather than pcap_breakloop(). */
2713 pcap_opts->pcap_err = TRUE;
2715 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2718 if (sel_ret < 0 && errno != EINTR) {
2719 g_snprintf(errmsg, errmsg_len,
2720 "Unexpected error from select: %s", g_strerror(errno));
2721 report_capture_error(errmsg, please_report);
2727 #endif /* MUST_DO_SELECT */
2729 /* dispatch from pcap without select */
2731 #ifdef LOG_CAPTURE_VERBOSE
2732 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2736 * On Windows, we don't support asynchronously telling a process to
2737 * stop capturing; instead, we check for an indication on a pipe
2738 * after processing packets. We therefore process only one packet
2739 * at a time, so that we can check the pipe after every packet.
2742 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2744 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2748 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2750 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2755 /* Error, rather than pcap_breakloop(). */
2756 pcap_opts->pcap_err = TRUE;
2758 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2760 #else /* pcap_next_ex */
2761 #ifdef LOG_CAPTURE_VERBOSE
2762 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2764 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2767 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2768 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2769 * This should be fixed in the WinPcap 4.0 alpha release.
2771 * For reference, an example remote interface:
2772 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2775 /* emulate dispatch from pcap */
2778 struct pcap_pkthdr *pkt_header;
2783 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2785 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2787 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2792 pcap_opts->pcap_err = TRUE;
2796 #endif /* pcap_next_ex */
2800 #ifdef LOG_CAPTURE_VERBOSE
2801 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2804 return ld->packet_count - packet_count_before;
2808 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2809 * want to grab only the characters between the '{' and '}' delimiters.
2811 * Returns a GString that must be freed with g_string_free(). */
2813 isolate_uuid(const char *iface)
2818 ptr = strchr(iface, '{');
2820 return g_string_new(iface);
2821 gstr = g_string_new(ptr + 1);
2823 ptr = strchr(gstr->str, '}');
2827 gstr = g_string_truncate(gstr, ptr - gstr->str);
2832 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2833 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2835 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2836 char *errmsg, int errmsg_len)
2839 gchar *capfile_name;
2841 gboolean is_tempfile;
2843 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2844 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2846 if (capture_opts->save_file != NULL) {
2847 /* We return to the caller while the capture is in progress.
2848 * Therefore we need to take a copy of save_file in
2849 * case the caller destroys it after we return.
2851 capfile_name = g_strdup(capture_opts->save_file);
2853 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2854 if (capture_opts->multi_files_on) {
2855 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2856 g_snprintf(errmsg, errmsg_len,
2857 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2858 g_free(capfile_name);
2861 if (strcmp(capfile_name, "-") == 0) {
2862 /* write to stdout */
2865 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2866 _setmode(1, O_BINARY);
2869 } /* if (...output_to_pipe ... */
2872 if (capture_opts->multi_files_on) {
2873 /* ringbuffer is enabled */
2874 *save_file_fd = ringbuf_init(capfile_name,
2875 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2876 capture_opts->group_read_access);
2878 /* we need the ringbuf name */
2879 if(*save_file_fd != -1) {
2880 g_free(capfile_name);
2881 capfile_name = g_strdup(ringbuf_current_filename());
2884 /* Try to open/create the specified file for use as a capture buffer. */
2885 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2886 (capture_opts->group_read_access) ? 0640 : 0600);
2889 is_tempfile = FALSE;
2891 /* Choose a random name for the temporary capture buffer */
2892 if (global_capture_opts.ifaces->len > 1) {
2893 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
2898 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
2899 basename = g_path_get_basename(iface->str);
2900 g_string_free(iface, TRUE);
2902 basename = g_path_get_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
2904 prefix = g_strconcat("wireshark_", basename, NULL);
2907 *save_file_fd = create_tempfile(&tmpname, prefix);
2909 capfile_name = g_strdup(tmpname);
2913 /* did we fail to open the output file? */
2914 if (*save_file_fd == -1) {
2916 g_snprintf(errmsg, errmsg_len,
2917 "The temporary file to which the capture would be saved (\"%s\") "
2918 "could not be opened: %s.", capfile_name, g_strerror(errno));
2920 if (capture_opts->multi_files_on) {
2921 ringbuf_error_cleanup();
2924 g_snprintf(errmsg, errmsg_len,
2925 "The file to which the capture would be saved (\"%s\") "
2926 "could not be opened: %s.", capfile_name,
2929 g_free(capfile_name);
2933 if(capture_opts->save_file != NULL) {
2934 g_free(capture_opts->save_file);
2936 capture_opts->save_file = capfile_name;
2937 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2938 "g_free(capfile_name)". */
2944 /* Do the work of handling either the file size or file duration capture
2945 conditions being reached, and switching files or stopping. */
2947 do_file_switch_or_stop(capture_options *capture_opts,
2948 condition *cnd_autostop_files,
2949 condition *cnd_autostop_size,
2950 condition *cnd_file_duration)
2953 pcap_options *pcap_opts;
2954 interface_options interface_opts;
2955 gboolean successful;
2957 if (capture_opts->multi_files_on) {
2958 if (cnd_autostop_files != NULL &&
2959 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2960 /* no files left: stop here */
2961 global_ld.go = FALSE;
2965 /* Switch to the next ringbuffer file */
2966 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2967 &global_ld.save_file_fd, &global_ld.err)) {
2969 /* File switch succeeded: reset the conditions */
2970 global_ld.bytes_written = 0;
2971 if (capture_opts->use_pcapng) {
2974 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2975 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &(global_ld.bytes_written), &global_ld.err);
2976 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2977 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2978 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2979 successful = libpcap_write_interface_description_block(global_ld.pdh,
2980 interface_opts.name,
2981 interface_opts.cfilter?interface_opts.cfilter:"",
2982 pcap_opts->linktype,
2984 &(global_ld.bytes_written),
2988 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
2989 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
2990 &global_ld.bytes_written, &global_ld.err);
2993 fclose(global_ld.pdh);
2994 global_ld.pdh = NULL;
2995 global_ld.go = FALSE;
2998 if (cnd_autostop_size)
2999 cnd_reset(cnd_autostop_size);
3000 if (cnd_file_duration)
3001 cnd_reset(cnd_file_duration);
3002 libpcap_dump_flush(global_ld.pdh, NULL);
3004 report_packet_count(global_ld.inpkts_to_sync_pipe);
3005 global_ld.inpkts_to_sync_pipe = 0;
3006 report_new_capture_file(capture_opts->save_file);
3008 /* File switch failed: stop here */
3009 global_ld.go = FALSE;
3013 /* single file, stop now */
3014 global_ld.go = FALSE;
3021 pcap_read_handler(void* arg)
3023 pcap_options *pcap_opts;
3024 char errmsg[MSG_MAX_LENGTH+1];
3026 pcap_opts = (pcap_options *)arg;
3028 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
3029 pcap_opts->interface_id);
3031 while (global_ld.go) {
3032 /* dispatch incoming packets */
3033 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
3035 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
3036 pcap_opts->interface_id);
3037 g_thread_exit(NULL);
3041 /* Do the low-level work of a capture.
3042 Returns TRUE if it succeeds, FALSE otherwise. */
3044 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3047 DWORD upd_time, cur_time; /* GetTickCount() returns a "DWORD" (which is 'unsigned long') */
3049 struct timeval upd_time, cur_time;
3053 condition *cnd_file_duration = NULL;
3054 condition *cnd_autostop_files = NULL;
3055 condition *cnd_autostop_size = NULL;
3056 condition *cnd_autostop_duration = NULL;
3059 gboolean cfilter_error = FALSE;
3060 char errmsg[MSG_MAX_LENGTH+1];
3061 char secondary_errmsg[MSG_MAX_LENGTH+1];
3062 pcap_options *pcap_opts;
3063 interface_options interface_opts;
3064 guint i, error_index = 0;
3067 *secondary_errmsg = '\0';
3069 /* init the loop data */
3070 global_ld.go = TRUE;
3071 global_ld.packet_count = 0;
3073 global_ld.report_packet_count = FALSE;
3075 if (capture_opts->has_autostop_packets)
3076 global_ld.packet_max = capture_opts->autostop_packets;
3078 global_ld.packet_max = 0; /* no limit */
3079 global_ld.inpkts_to_sync_pipe = 0;
3080 global_ld.err = 0; /* no error seen yet */
3081 global_ld.pdh = NULL;
3082 global_ld.autostop_files = 0;
3083 global_ld.save_file_fd = -1;
3085 /* We haven't yet gotten the capture statistics. */
3086 *stats_known = FALSE;
3088 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3089 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3091 /* open the "input file" from network interface or capture pipe */
3092 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3093 secondary_errmsg, sizeof(secondary_errmsg))) {
3096 for (i = 0; i < capture_opts->ifaces->len; i++) {
3097 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3098 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3099 /* init the input filter from the network interface (capture pipe will do nothing) */
3101 * When remote capturing WinPCap crashes when the capture filter
3102 * is NULL. This might be a bug in WPCap. Therefore we provide an emtpy
3105 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3106 interface_opts.name,
3107 interface_opts.cfilter?interface_opts.cfilter:"")) {
3109 case INITFILTER_NO_ERROR:
3112 case INITFILTER_BAD_FILTER:
3113 cfilter_error = TRUE;
3115 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3118 case INITFILTER_OTHER_ERROR:
3119 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3120 pcap_geterr(pcap_opts->pcap_h));
3121 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3126 /* If we're supposed to write to a capture file, open it for output
3127 (temporary/specified name/ringbuffer) */
3128 if (capture_opts->saving_to_file) {
3129 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3130 errmsg, sizeof(errmsg))) {
3134 /* set up to write to the already-opened capture output file/files */
3135 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3140 /* XXX - capture SIGTERM and close the capture, in case we're on a
3141 Linux 2.0[.x] system and you have to explicitly close the capture
3142 stream in order to turn promiscuous mode off? We need to do that
3143 in other places as well - and I don't think that works all the
3144 time in any case, due to libpcap bugs. */
3146 /* Well, we should be able to start capturing.
3148 Sync out the capture file, so the header makes it to the file system,
3149 and send a "capture started successfully and capture file created"
3150 message to our parent so that they'll open the capture file and
3151 update its windows to indicate that we have a live capture in
3153 libpcap_dump_flush(global_ld.pdh, NULL);
3154 report_new_capture_file(capture_opts->save_file);
3157 /* initialize capture stop (and alike) conditions */
3158 init_capture_stop_conditions();
3159 /* create stop conditions */
3160 if (capture_opts->has_autostop_filesize)
3162 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3163 if (capture_opts->has_autostop_duration)
3164 cnd_autostop_duration =
3165 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3167 if (capture_opts->multi_files_on) {
3168 if (capture_opts->has_file_duration)
3170 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3172 if (capture_opts->has_autostop_files)
3173 cnd_autostop_files =
3174 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3177 /* init the time values */
3179 upd_time = GetTickCount();
3181 gettimeofday(&upd_time, NULL);
3184 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3186 /* WOW, everything is prepared! */
3187 /* please fasten your seat belts, we will enter now the actual capture loop */
3189 pcap_queue = g_async_queue_new();
3190 pcap_queue_bytes = 0;
3191 pcap_queue_packets = 0;
3192 for (i = 0; i < global_ld.pcaps->len; i++) {
3193 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3194 #if GLIB_CHECK_VERSION(2,31,0)
3195 /* XXX - Add an interface name here? */
3196 pcap_opts->tid = g_thread_new("Capture read", pcap_read_handler, pcap_opts);
3198 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3202 while (global_ld.go) {
3203 /* dispatch incoming packets */
3205 GTimeVal write_thread_time;
3206 pcap_queue_element *queue_element;
3208 g_get_current_time(&write_thread_time);
3209 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3210 g_async_queue_lock(pcap_queue);
3211 queue_element = g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3212 if (queue_element) {
3213 pcap_queue_bytes -= queue_element->phdr.caplen;
3214 pcap_queue_packets -= 1;
3216 g_async_queue_unlock(pcap_queue);
3217 if (queue_element) {
3218 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3219 "Dequeued a packet of length %d captured on interface %d.",
3220 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3222 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3223 &queue_element->phdr,
3225 g_free(queue_element->pd);
3226 g_free(queue_element);
3232 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3233 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3234 sizeof(errmsg), pcap_opts);
3237 /* Were we asked to print packet counts by the SIGINFO handler? */
3238 if (global_ld.report_packet_count) {
3239 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3240 plurality(global_ld.packet_count, "", "s"));
3241 global_ld.report_packet_count = FALSE;
3246 /* any news from our parent (signal pipe)? -> just stop the capture */
3247 if (!signal_pipe_check_running()) {
3248 global_ld.go = FALSE;
3253 global_ld.inpkts_to_sync_pipe += inpkts;
3255 /* check capture size condition */
3256 if (cnd_autostop_size != NULL &&
3257 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3258 /* Capture size limit reached, do we have another file? */
3259 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3260 cnd_autostop_size, cnd_file_duration))
3262 } /* cnd_autostop_size */
3263 if (capture_opts->output_to_pipe) {
3264 libpcap_dump_flush(global_ld.pdh, NULL);
3268 /* Only update once every 500ms so as not to overload slow displays.
3269 * This also prevents too much context-switching between the dumpcap
3270 * and wireshark processes.
3272 #define DUMPCAP_UPD_TIME 500
3275 cur_time = GetTickCount(); /* Note: wraps to 0 if sys runs for 49.7 days */
3276 if ((cur_time - upd_time) > DUMPCAP_UPD_TIME) { /* wrap just causes an extra update */
3278 gettimeofday(&cur_time, NULL);
3279 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3280 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3283 upd_time = cur_time;
3286 if (pcap_stats(pch, stats) >= 0) {
3287 *stats_known = TRUE;
3290 /* Let the parent process know. */
3291 if (global_ld.inpkts_to_sync_pipe) {
3293 libpcap_dump_flush(global_ld.pdh, NULL);
3295 /* Send our parent a message saying we've written out
3296 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3298 report_packet_count(global_ld.inpkts_to_sync_pipe);
3300 global_ld.inpkts_to_sync_pipe = 0;
3303 /* check capture duration condition */
3304 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3305 /* The maximum capture time has elapsed; stop the capture. */
3306 global_ld.go = FALSE;
3310 /* check capture file duration condition */
3311 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3312 /* duration limit reached, do we have another file? */
3313 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3314 cnd_autostop_size, cnd_file_duration))
3316 } /* cnd_file_duration */
3320 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3322 pcap_queue_element *queue_element;
3324 for (i = 0; i < global_ld.pcaps->len; i++) {
3325 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3326 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3327 pcap_opts->interface_id);
3328 g_thread_join(pcap_opts->tid);
3329 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3330 pcap_opts->interface_id);
3333 g_async_queue_lock(pcap_queue);
3334 queue_element = g_async_queue_try_pop_unlocked(pcap_queue);
3335 if (queue_element) {
3336 pcap_queue_bytes -= queue_element->phdr.caplen;
3337 pcap_queue_packets -= 1;
3339 g_async_queue_unlock(pcap_queue);
3340 if (queue_element == NULL) {
3343 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3344 "Dequeued a packet of length %d captured on interface %d.",
3345 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3346 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3347 &queue_element->phdr,
3349 g_free(queue_element->pd);
3350 g_free(queue_element);
3351 global_ld.inpkts_to_sync_pipe += 1;
3352 if (capture_opts->output_to_pipe) {
3353 libpcap_dump_flush(global_ld.pdh, NULL);
3359 /* delete stop conditions */
3360 if (cnd_file_duration != NULL)
3361 cnd_delete(cnd_file_duration);
3362 if (cnd_autostop_files != NULL)
3363 cnd_delete(cnd_autostop_files);
3364 if (cnd_autostop_size != NULL)
3365 cnd_delete(cnd_autostop_size);
3366 if (cnd_autostop_duration != NULL)
3367 cnd_delete(cnd_autostop_duration);
3369 /* did we have a pcap (input) error? */
3370 for (i = 0; i < capture_opts->ifaces->len; i++) {
3371 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3372 if (pcap_opts->pcap_err) {
3373 /* On Linux, if an interface goes down while you're capturing on it,
3374 you'll get a "recvfrom: Network is down" or
3375 "The interface went down" error (ENETDOWN).
3376 (At least you will if g_strerror() doesn't show a local translation
3379 On FreeBSD and OS X, if a network adapter disappears while
3380 you're capturing on it, you'll get a "read: Device not configured"
3381 error (ENXIO). (See previous parenthetical note.)
3383 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3385 These should *not* be reported to the Wireshark developers. */
3388 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3389 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3390 strcmp(cap_err_str, "The interface went down") == 0 ||
3391 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3392 strcmp(cap_err_str, "read: I/O error") == 0 ||
3393 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3394 report_capture_error("The network adapter on which the capture was being done "
3395 "is no longer running; the capture has stopped.",
3398 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3400 report_capture_error(errmsg, please_report);
3403 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3404 report_capture_error(errmsg, "");
3408 /* did we have an output error while capturing? */
3409 if (global_ld.err == 0) {
3412 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3413 global_ld.err, FALSE);
3414 report_capture_error(errmsg, please_report);
3418 if (capture_opts->saving_to_file) {
3419 /* close the output file */
3420 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3424 /* there might be packets not yet notified to the parent */
3425 /* (do this after closing the file, so all packets are already flushed) */
3426 if(global_ld.inpkts_to_sync_pipe) {
3428 report_packet_count(global_ld.inpkts_to_sync_pipe);
3429 global_ld.inpkts_to_sync_pipe = 0;
3432 /* If we've displayed a message about a write error, there's no point
3433 in displaying another message about an error on close. */
3434 if (!close_ok && write_ok) {
3435 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3437 report_capture_error(errmsg, "");
3441 * XXX We exhibit different behaviour between normal mode and sync mode
3442 * when the pipe is stdin and not already at EOF. If we're a child, the
3443 * parent's stdin isn't closed, so if the user starts another capture,
3444 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3445 * will say "Unrecognized libpcap format". On the other hand, in normal
3446 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3449 report_capture_count(TRUE);
3451 /* get packet drop statistics from pcap */
3452 for (i = 0; i < capture_opts->ifaces->len; i++) {
3456 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3457 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3458 received = pcap_opts->received;
3459 dropped = pcap_opts->dropped;
3460 if (pcap_opts->pcap_h != NULL) {
3461 g_assert(!pcap_opts->from_cap_pipe);
3462 /* Get the capture statistics, so we know how many packets were dropped. */
3463 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3464 *stats_known = TRUE;
3465 /* Let the parent process know. */
3466 dropped += stats->ps_drop;
3468 g_snprintf(errmsg, sizeof(errmsg),
3469 "Can't get packet-drop statistics: %s",
3470 pcap_geterr(pcap_opts->pcap_h));
3471 report_capture_error(errmsg, please_report);
3474 report_packet_drops(received, dropped, interface_opts.name);
3477 /* close the input file (pcap or capture pipe) */
3478 capture_loop_close_input(&global_ld);
3480 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3482 /* ok, if the write and the close were successful. */
3483 return write_ok && close_ok;
3486 if (capture_opts->multi_files_on) {
3487 /* cleanup ringbuffer */
3488 ringbuf_error_cleanup();
3490 /* We can't use the save file, and we have no FILE * for the stream
3491 to close in order to close it, so close the FD directly. */
3492 if (global_ld.save_file_fd != -1) {
3493 ws_close(global_ld.save_file_fd);
3496 /* We couldn't even start the capture, so get rid of the capture
3498 if (capture_opts->save_file != NULL) {
3499 ws_unlink(capture_opts->save_file);
3500 g_free(capture_opts->save_file);
3503 capture_opts->save_file = NULL;
3505 report_cfilter_error(capture_opts, error_index, errmsg);
3507 report_capture_error(errmsg, secondary_errmsg);
3509 /* close the input file (pcap or cap_pipe) */
3510 capture_loop_close_input(&global_ld);
3512 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3518 static void capture_loop_stop(void)
3520 #ifdef HAVE_PCAP_BREAKLOOP
3522 pcap_options *pcap_opts;
3524 for (i = 0; i < global_ld.pcaps->len; i++) {
3525 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3526 if (pcap_opts->pcap_h != NULL)
3527 pcap_breakloop(pcap_opts->pcap_h);
3530 global_ld.go = FALSE;
3535 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3536 int err, gboolean is_close)
3541 g_snprintf(errmsg, errmsglen,
3542 "Not all the packets could be written to the file"
3543 " to which the capture was being saved\n"
3544 "(\"%s\") because there is no space left on the file system\n"
3545 "on which that file resides.",
3551 g_snprintf(errmsg, errmsglen,
3552 "Not all the packets could be written to the file"
3553 " to which the capture was being saved\n"
3554 "(\"%s\") because you are too close to, or over,"
3555 " your disk quota\n"
3556 "on the file system on which that file resides.",
3563 g_snprintf(errmsg, errmsglen,
3564 "The file to which the capture was being saved\n"
3565 "(\"%s\") could not be closed: %s.",
3566 fname, g_strerror(err));
3568 g_snprintf(errmsg, errmsglen,
3569 "An error occurred while writing to the file"
3570 " to which the capture was being saved\n"
3572 fname, g_strerror(err));
3579 /* one packet was captured, process it */
3581 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3584 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3587 /* We may be called multiple times from pcap_dispatch(); if we've set
3588 the "stop capturing" flag, ignore this packet, as we're not
3589 supposed to be saving any more packets. */
3593 if (global_ld.pdh) {
3594 gboolean successful;
3596 /* We're supposed to write the packet to a file; do so.
3597 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3598 "ld->err" to the error. */
3599 if (global_capture_opts.use_pcapng) {
3600 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, pcap_opts->interface_id, pd, &global_ld.bytes_written, &err);
3602 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3605 global_ld.go = FALSE;
3606 global_ld.err = err;
3608 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3609 "Wrote a packet of length %d captured on interface %u.",
3610 phdr->caplen, pcap_opts->interface_id);
3611 global_ld.packet_count++;
3612 pcap_opts->received++;
3613 /* if the user told us to stop after x packets, do we already have enough? */
3614 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3615 global_ld.go = FALSE;
3621 /* one packet was captured, queue it */
3623 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3626 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3627 pcap_queue_element *queue_element;
3628 gboolean limit_reached;
3630 /* We may be called multiple times from pcap_dispatch(); if we've set
3631 the "stop capturing" flag, ignore this packet, as we're not
3632 supposed to be saving any more packets. */
3636 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3637 if (queue_element == NULL) {
3638 pcap_opts->dropped++;
3641 queue_element->pcap_opts = pcap_opts;
3642 queue_element->phdr = *phdr;
3643 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3644 if (queue_element->pd == NULL) {
3645 pcap_opts->dropped++;
3646 g_free(queue_element);
3649 memcpy(queue_element->pd, pd, phdr->caplen);
3650 g_async_queue_lock(pcap_queue);
3651 if (((pcap_queue_byte_limit > 0) && (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3652 ((pcap_queue_packet_limit > 0) && (pcap_queue_packets < pcap_queue_packet_limit))) {
3653 limit_reached = FALSE;
3654 g_async_queue_push_unlocked(pcap_queue, queue_element);
3655 pcap_queue_bytes += phdr->caplen;
3656 pcap_queue_packets += 1;
3658 limit_reached = TRUE;
3660 g_async_queue_unlock(pcap_queue);
3661 if (limit_reached) {
3662 pcap_opts->dropped++;
3663 g_free(queue_element->pd);
3664 g_free(queue_element);
3665 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3666 "Dropped a packet of length %d captured on interface %u.",
3667 phdr->caplen, pcap_opts->interface_id);
3669 pcap_opts->received++;
3670 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3671 "Queued a packet of length %d captured on interface %u.",
3672 phdr->caplen, pcap_opts->interface_id);
3674 /* I don't want to hold the mutex over the debug output. So the
3675 output may be wrong */
3676 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3677 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3678 pcap_queue_bytes, pcap_queue_packets);
3681 /* And now our feature presentation... [ fade to music ] */
3683 main(int argc, char *argv[])
3686 gboolean arg_error = FALSE;
3691 struct sigaction action, oldaction;
3694 gboolean start_capture = TRUE;
3695 gboolean stats_known;
3696 struct pcap_stat stats;
3697 GLogLevelFlags log_flags;
3698 gboolean list_interfaces = FALSE;
3699 gboolean list_link_layer_types = FALSE;
3700 #ifdef HAVE_BPF_IMAGE
3701 gboolean print_bpf_code = FALSE;
3703 gboolean machine_readable = FALSE;
3704 gboolean print_statistics = FALSE;
3705 int status, run_once_args = 0;
3708 #if defined(__APPLE__) && defined(__LP64__)
3709 struct utsname osinfo;
3714 arg_list_utf_16to8(argc, argv);
3719 * Initialize our DLL search path. MUST be called before LoadLibrary
3722 ws_init_dll_search_path();
3725 #ifdef HAVE_PCAP_REMOTE
3726 #define OPTSTRING_A "A:"
3727 #define OPTSTRING_r "r"
3728 #define OPTSTRING_u "u"
3730 #define OPTSTRING_A ""
3731 #define OPTSTRING_r ""
3732 #define OPTSTRING_u ""
3735 #ifdef HAVE_PCAP_SETSAMPLING
3736 #define OPTSTRING_m "m:"
3738 #define OPTSTRING_m ""
3741 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3742 #define OPTSTRING_B "B:"
3744 #define OPTSTRING_B ""
3745 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3747 #ifdef HAVE_PCAP_CREATE
3748 #define OPTSTRING_I "I"
3750 #define OPTSTRING_I ""
3753 #ifdef HAVE_BPF_IMAGE
3754 #define OPTSTRING_d "d"
3756 #define OPTSTRING_d ""
3759 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "L" OPTSTRING_m "MnpPq" OPTSTRING_r "Ss:t" OPTSTRING_u "vw:y:Z:"
3761 #ifdef DEBUG_CHILD_DUMPCAP
3762 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3763 fprintf (stderr, "Unable to open debug log file !\n");
3768 #if defined(__APPLE__) && defined(__LP64__)
3770 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3771 * a bug workaround - timeouts less than 1 second don't work with libpcap
3772 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3773 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3774 * The problem is extremely unlikely to be reintroduced in a future
3777 if (uname(&osinfo) == 0) {
3779 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3780 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3781 * number of 10.0.0, not 10.1.0 - go figure).
3783 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3784 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3785 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3786 need_timeout_workaround = TRUE;
3791 * Determine if dumpcap is being requested to run in a special
3792 * capture_child mode by going thru the command line args to see if
3793 * a -Z is present. (-Z is a hidden option).
3795 * The primary result of running in capture_child mode is that
3796 * all messages sent out on stderr are in a special type/len/string
3797 * format to allow message processing by type. These messages include
3798 * error messages if dumpcap fails to start the operation it was
3799 * requested to do, as well as various "status" messages which are sent
3800 * when an actual capture is in progress, and a "success" message sent
3801 * if dumpcap was requested to perform an operation other than a
3804 * Capture_child mode would normally be requested by a parent process
3805 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3806 * to which dumpcap stderr has been redirected. It might also have
3807 * another pipe to obtain dumpcap stdout output; for operations other
3808 * than a capture, that information is formatted specially for easier
3809 * parsing by the parent process.
3811 * Capture_child mode needs to be determined immediately upon
3812 * startup so that any messages generated by dumpcap in this mode
3813 * (eg: during initialization) will be formatted properly.
3816 for (i=1; i<argc; i++) {
3817 if (strcmp("-Z", argv[i]) == 0) {
3818 capture_child = TRUE;
3819 machine_readable = TRUE; /* request machine-readable output */
3821 /* set output pipe to binary mode, to avoid ugly text conversions */
3822 _setmode(2, O_BINARY);
3827 /* The default_log_handler will use stdout, which makes trouble in */
3828 /* capture child mode, as it uses stdout for it's sync_pipe. */
3829 /* So: the filtering is done in the console_log_handler and not here.*/
3830 /* We set the log handlers right up front to make sure that any log */
3831 /* messages when running as child will be sent back to the parent */
3832 /* with the correct format. */
3836 G_LOG_LEVEL_CRITICAL|
3837 G_LOG_LEVEL_WARNING|
3838 G_LOG_LEVEL_MESSAGE|
3841 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3843 g_log_set_handler(NULL,
3845 console_log_handler, NULL /* user_data */);
3846 g_log_set_handler(LOG_DOMAIN_MAIN,
3848 console_log_handler, NULL /* user_data */);
3849 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3851 console_log_handler, NULL /* user_data */);
3852 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3854 console_log_handler, NULL /* user_data */);
3856 /* Initialize the pcaps list */
3857 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
3859 #if !GLIB_CHECK_VERSION(2,31,0)
3860 /* Initialize the thread system */
3861 g_thread_init(NULL);
3865 /* Load wpcap if possible. Do this before collecting the run-time version information */
3868 /* ... and also load the packet.dll from wpcap */
3869 /* XXX - currently not required, may change later. */
3870 /*wpcap_packet_load();*/
3872 /* Start windows sockets */
3873 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3875 /* Set handler for Ctrl+C key */
3876 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3878 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3880 action.sa_handler = capture_cleanup_handler;
3882 * Arrange that system calls not get restarted, because when
3883 * our signal handler returns we don't want to restart
3884 * a call that was waiting for packets to arrive.
3886 action.sa_flags = 0;
3887 sigemptyset(&action.sa_mask);
3888 sigaction(SIGTERM, &action, NULL);
3889 sigaction(SIGINT, &action, NULL);
3890 sigaction(SIGPIPE, &action, NULL);
3891 sigaction(SIGHUP, NULL, &oldaction);
3892 if (oldaction.sa_handler == SIG_DFL)
3893 sigaction(SIGHUP, &action, NULL);
3896 /* Catch SIGINFO and, if we get it and we're capturing in
3897 quiet mode, report the number of packets we've captured. */
3898 action.sa_handler = report_counts_siginfo;
3899 action.sa_flags = SA_RESTART;
3900 sigemptyset(&action.sa_mask);
3901 sigaction(SIGINFO, &action, NULL);
3902 #endif /* SIGINFO */
3905 /* ----------------------------------------------------------------- */
3906 /* Privilege and capability handling */
3908 /* 1. Running not as root or suid root; no special capabilities. */
3911 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3914 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3916 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3917 /* capabilities; Drop all other capabilities; */
3918 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3919 /* else: after pcap_open_live() in capture_loop_open_input() */
3920 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3921 /* (Note: this means that the process, although logged in */
3922 /* as root, does not have various permissions such as the */
3923 /* ability to bypass file access permissions). */
3924 /* XXX: Should we just leave capabilities alone in this case */
3925 /* so that user gets expected effect that root can do */
3928 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3930 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3931 /* else: after pcap_open_live() in capture_loop_open_input() */
3932 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3933 /* pcap_open_live). */
3935 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3937 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3938 /* capabilities; Drop all other capabilities; */
3939 /* Drop suid privileges (euid=ruid); */
3940 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3941 /* else: after pcap_open_live() in capture_loop_open_input() */
3942 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3944 /* XXX: For some Linux versions/distros with capabilities */
3945 /* a 'normal' process with any capabilities cannot be */
3946 /* 'killed' (signaled) from another (same uid) non-privileged */
3948 /* For example: If (non-suid) Wireshark forks a */
3949 /* child suid dumpcap which acts as described here (case 5), */
3950 /* Wireshark will be unable to kill (signal) the child */
3951 /* dumpcap process until the capabilities have been dropped */
3952 /* (after pcap_open_live()). */
3953 /* This behaviour will apparently be changed in the kernel */
3954 /* to allow the kill (signal) in this case. */
3955 /* See the following for details: */
3956 /* http://www.mail-archive.com/ [wrapped] */
3957 /* linux-security-module@vger.kernel.org/msg02913.html */
3959 /* It is therefore conceivable that if dumpcap somehow hangs */
3960 /* in pcap_open_live or before that wireshark will not */
3961 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3962 /* In this case, exiting wireshark will kill the child */
3963 /* dumpcap process. */
3965 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3966 /* capabilities; Using libcap. Note: capset cmd (which see) */
3967 /* used to assign capabilities to file. */
3969 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3970 /* else: after pcap_open_live() in capture_loop_open_input() */
3971 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3973 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3974 /* longer required (similar to capture). */
3976 /* ----------------------------------------------------------------- */
3978 init_process_policies();
3981 /* If 'started with special privileges' (and using libcap) */
3982 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3983 /* Set euid/egid = ruid/rgid to remove suid privileges */
3984 relinquish_privs_except_capture();
3987 /* Set the initial values in the capture options. This might be overwritten
3988 by the command line parameters. */
3989 capture_opts_init(&global_capture_opts, NULL);
3991 /* We always save to a file - if no file was specified, we save to a
3993 global_capture_opts.saving_to_file = TRUE;
3994 global_capture_opts.has_ring_num_files = TRUE;
3996 /* Now get our args */
3997 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3999 case 'h': /* Print help and exit */
4003 case 'v': /* Show version and exit */
4005 GString *comp_info_str;
4006 GString *runtime_info_str;
4007 /* Assemble the compile-time version information string */
4008 comp_info_str = g_string_new("Compiled ");
4009 get_compiled_version_info(comp_info_str, NULL, NULL);
4011 /* Assemble the run-time version information string */
4012 runtime_info_str = g_string_new("Running ");
4013 get_runtime_version_info(runtime_info_str, NULL);
4014 show_version(comp_info_str, runtime_info_str);
4015 g_string_free(comp_info_str, TRUE);
4016 g_string_free(runtime_info_str, TRUE);
4020 /*** capture option specific ***/
4021 case 'a': /* autostop criteria */
4022 case 'b': /* Ringbuffer option */
4023 case 'c': /* Capture x packets */
4024 case 'f': /* capture filter */
4025 case 'i': /* Use interface x */
4026 case 'n': /* Use pcapng format */
4027 case 'p': /* Don't capture in promiscuous mode */
4028 case 'P': /* Use pcap format */
4029 case 's': /* Set the snapshot (capture) length */
4030 case 'w': /* Write to capture file x */
4031 case 'g': /* enable group read accesson file(s) */
4032 case 'y': /* Set the pcap data link type */
4033 #ifdef HAVE_PCAP_REMOTE
4034 case 'u': /* Use UDP for data transfer */
4035 case 'r': /* Capture own RPCAP traffic too */
4036 case 'A': /* Authentication */
4038 #ifdef HAVE_PCAP_SETSAMPLING
4039 case 'm': /* Sampling */
4041 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4042 case 'B': /* Buffer size */
4043 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4044 #ifdef HAVE_PCAP_CREATE
4045 case 'I': /* Monitor mode */
4047 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4052 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4054 capture_child = TRUE;
4056 /* set output pipe to binary mode, to avoid ugly text conversions */
4057 _setmode(2, O_BINARY);
4059 * optarg = the control ID, aka the PPID, currently used for the
4062 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4063 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4064 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4065 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4067 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4068 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4069 "Signal pipe: Unable to open %s. Dead parent?",
4077 case 'q': /* Quiet */
4083 /*** all non capture option specific ***/
4084 case 'D': /* Print a list of capture devices and exit */
4085 list_interfaces = TRUE;
4088 case 'L': /* Print list of link-layer types and exit */
4089 list_link_layer_types = TRUE;
4092 #ifdef HAVE_BPF_IMAGE
4093 case 'd': /* Print BPF code for capture filter and exit */
4094 print_bpf_code = TRUE;
4098 case 'S': /* Print interface statistics once a second */
4099 print_statistics = TRUE;
4102 case 'M': /* For -D, -L, and -S, print machine-readable output */
4103 machine_readable = TRUE;
4106 cmdarg_err("Invalid Option: %s", argv[optind-1]);
4108 case '?': /* Bad flag - print usage message */
4117 /* user specified file name as regular command-line argument */
4118 /* XXX - use it as the capture file name (or something else)? */
4124 * Extra command line arguments were specified; complain.
4125 * XXX - interpret as capture filter, as tcpdump and tshark do?
4127 cmdarg_err("Invalid argument: %s", argv[0]);
4137 if (run_once_args > 1) {
4138 cmdarg_err("Only one of -D, -L, or -S may be supplied.");
4140 } else if (run_once_args == 1) {
4141 /* We're supposed to print some information, rather than
4142 to capture traffic; did they specify a ring buffer option? */
4143 if (global_capture_opts.multi_files_on) {
4144 cmdarg_err("Ring buffer requested, but a capture isn't being done.");
4148 /* We're supposed to capture traffic; */
4149 /* Are we capturing on multiple interface? If so, use threads and pcapng. */
4150 if (global_capture_opts.ifaces->len > 1) {
4152 global_capture_opts.use_pcapng = TRUE;
4154 /* Was the ring buffer option specified and, if so, does it make sense? */
4155 if (global_capture_opts.multi_files_on) {
4156 /* Ring buffer works only under certain conditions:
4157 a) ring buffer does not work with temporary files;
4158 b) it makes no sense to enable the ring buffer if the maximum
4159 file size is set to "infinite". */
4160 if (global_capture_opts.save_file == NULL) {
4161 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4162 global_capture_opts.multi_files_on = FALSE;
4164 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4165 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4167 /* XXX - this must be redesigned as the conditions changed */
4168 global_capture_opts.multi_files_on = FALSE;
4175 * "-D" requires no interface to be selected; it's supposed to list
4178 if (list_interfaces) {
4179 /* Get the list of interfaces */
4184 if_list = capture_interface_list(&err, &err_str);
4185 if (if_list == NULL) {
4187 case CANT_GET_INTERFACE_LIST:
4188 cmdarg_err("%s", err_str);
4193 case NO_INTERFACES_FOUND:
4195 * If we're being run by another program, just give them
4196 * an empty list of interfaces, don't report this as
4197 * an error; that lets them decide whether to report
4198 * this as an error or not.
4200 if (!machine_readable) {
4201 cmdarg_err("There are no interfaces on which a capture can be done");
4208 if (machine_readable) /* tab-separated values to stdout */
4209 print_machine_readable_interfaces(if_list);
4211 capture_opts_print_interfaces(if_list);
4212 free_interface_list(if_list);
4217 * "-S" requires no interface to be selected; it gives statistics
4218 * for all interfaces.
4220 if (print_statistics) {
4221 status = print_statistics_loop(machine_readable);
4226 * "-L", "-d", and capturing act on a particular interface, so we have to
4227 * have an interface; if none was specified, pick a default.
4229 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4230 /* cmdarg_err() already called .... */
4234 /* Let the user know what interfaces were chosen. */
4235 /* get_interface_descriptive_name() is not available! */
4236 if (capture_child) {
4237 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4238 interface_options interface_opts;
4240 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4241 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s\n",
4242 interface_opts.name);
4245 str = g_string_new("");
4247 if (global_capture_opts.ifaces->len < 2) {
4249 if (global_capture_opts.ifaces->len < 4) {
4251 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4252 interface_options interface_opts;
4254 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4256 if (global_capture_opts.ifaces->len > 2) {
4257 g_string_append_printf(str, ",");
4259 g_string_append_printf(str, " ");
4260 if (j == global_capture_opts.ifaces->len - 1) {
4261 g_string_append_printf(str, "and ");
4264 g_string_append_printf(str, "%s", interface_opts.name);
4267 g_string_append_printf(str, "%u interfaces", global_capture_opts.ifaces->len);
4269 fprintf(stderr, "Capturing on %s\n", str->str);
4270 g_string_free(str, TRUE);
4273 if (list_link_layer_types) {
4274 /* Get the list of link-layer types for the capture device. */
4275 if_capabilities_t *caps;
4279 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4280 interface_options interface_opts;
4282 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4283 caps = get_if_capabilities(interface_opts.name,
4284 interface_opts.monitor_mode, &err_str);
4286 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4287 "Please check to make sure you have sufficient permissions, and that\n"
4288 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4292 if (caps->data_link_types == NULL) {
4293 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4296 if (machine_readable) /* tab-separated values to stdout */
4297 /* XXX: We need to change the format and adopt consumers */
4298 print_machine_readable_if_capabilities(caps);
4300 /* XXX: We might want to print also the interface name */
4301 capture_opts_print_if_capabilities(caps, interface_opts.name,
4302 interface_opts.monitor_mode);
4303 free_if_capabilities(caps);
4308 /* We're supposed to do a capture, or print the BPF code for a filter.
4309 Process the snapshot length, as that affects the generated BPF code. */
4310 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4312 #ifdef HAVE_BPF_IMAGE
4313 if (print_bpf_code) {
4314 show_filter_code(&global_capture_opts);
4319 /* We're supposed to do a capture. Process the ring buffer arguments. */
4320 capture_opts_trim_ring_num_files(&global_capture_opts);
4322 /* Now start the capture. */
4324 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4328 /* capture failed */
4331 return 0; /* never here, make compiler happy */
4336 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4337 const char *message, gpointer user_data _U_)
4344 /* ignore log message, if log_level isn't interesting */
4345 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4346 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4351 /* create a "timestamp" */
4353 today = localtime(&curr);
4355 switch(log_level & G_LOG_LEVEL_MASK) {
4356 case G_LOG_LEVEL_ERROR:
4359 case G_LOG_LEVEL_CRITICAL:
4362 case G_LOG_LEVEL_WARNING:
4365 case G_LOG_LEVEL_MESSAGE:
4368 case G_LOG_LEVEL_INFO:
4371 case G_LOG_LEVEL_DEBUG:
4375 fprintf(stderr, "unknown log_level %u\n", log_level);
4377 g_assert_not_reached();
4380 /* Generate the output message */
4381 if(log_level & G_LOG_LEVEL_MESSAGE) {
4382 /* normal user messages without additional infos */
4383 msg = g_strdup_printf("%s\n", message);
4385 /* info/debug messages with additional infos */
4386 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4387 today->tm_hour, today->tm_min, today->tm_sec,
4388 log_domain != NULL ? log_domain : "",
4392 /* DEBUG & INFO msgs (if we're debugging today) */
4393 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4394 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4395 #ifdef DEBUG_DUMPCAP
4396 fprintf(stderr, "%s", msg);
4399 #ifdef DEBUG_CHILD_DUMPCAP
4400 fprintf(debug_log, "%s", msg);
4408 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4409 /* to parent especially formatted if dumpcap running as child. */
4410 if (capture_child) {
4411 sync_pipe_errmsg_to_parent(2, msg, "");
4413 fprintf(stderr, "%s", msg);
4420 /****************************************************************************************************************/
4421 /* indication report routines */
4425 report_packet_count(int packet_count)
4427 char tmp[SP_DECISIZE+1+1];
4428 static int count = 0;
4431 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4432 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4433 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4435 count += packet_count;
4436 fprintf(stderr, "\rPackets: %u ", count);
4437 /* stderr could be line buffered */
4443 report_new_capture_file(const char *filename)
4446 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4447 pipe_write_block(2, SP_FILE, filename);
4451 * Prevent a SIGINFO handler from writing to the standard error
4452 * while we're doing so; instead, have it just set a flag telling
4453 * us to print that information when we're done.
4456 #endif /* SIGINFO */
4457 fprintf(stderr, "File: %s\n", filename);
4458 /* stderr could be line buffered */
4463 * Allow SIGINFO handlers to write.
4468 * If a SIGINFO handler asked us to write out capture counts, do so.
4471 report_counts_for_siginfo();
4472 #endif /* SIGINFO */
4477 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4479 interface_options interface_opts;
4480 char tmp[MSG_MAX_LENGTH+1+6];
4482 if (i < capture_opts->ifaces->len) {
4483 if (capture_child) {
4484 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4485 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4486 pipe_write_block(2, SP_BAD_FILTER, tmp);
4489 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4490 * the error message below.
4492 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4494 "Invalid capture filter: \"%s\" for interface %s!\n"
4496 "That string isn't a valid capture filter (%s).\n"
4497 "See the User's Guide for a description of the capture filter syntax.",
4498 interface_opts.cfilter, interface_opts.name, errmsg);
4504 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4507 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4508 "Primary Error: %s", error_msg);
4509 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4510 "Secondary Error: %s", secondary_error_msg);
4511 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4513 cmdarg_err("%s", error_msg);
4514 if (secondary_error_msg[0] != '\0')
4515 cmdarg_err_cont("%s", secondary_error_msg);
4520 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4522 char tmp[SP_DECISIZE+1+1];
4524 g_snprintf(tmp, sizeof(tmp), "%u", drops);
4527 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4528 "Packets received/dropped on interface %s: %u/%u",
4529 name, received, drops);
4530 /* XXX: Need to provide interface id, changes to consumers required. */
4531 pipe_write_block(2, SP_DROPS, tmp);
4534 "Packets received/dropped on interface %s: %u/%u (%.1f%%)\n",
4535 name, received, drops,
4536 received ? 100.0 * received / (received + drops) : 0.0);
4537 /* stderr could be line buffered */
4543 /****************************************************************************************************************/
4544 /* signal_pipe handling */
4549 signal_pipe_check_running(void)
4551 /* any news from our parent? -> just stop the capture */
4555 /* if we are running standalone, no check required */
4556 if(!capture_child) {
4560 if(!sig_pipe_name || !sig_pipe_handle) {
4561 /* This shouldn't happen */
4562 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4563 "Signal pipe: No name or handle");
4568 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4569 * at this point. Should we check to see if the parent is still alive,
4570 * e.g. by using OpenProcess?
4573 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4575 if(!result || avail > 0) {
4576 /* peek failed or some bytes really available */
4577 /* (if not piping from stdin this would fail) */
4578 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4579 "Signal pipe: Stop capture: %s", sig_pipe_name);
4580 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4581 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4582 sig_pipe_handle, result, avail);
4585 /* pipe ok and no bytes available */
4592 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4597 * indent-tabs-mode: nil
4600 * vi: set shiftwidth=4 tabstop=8 expandtab:
4601 * :indentSize=4:tabSize=8:noTabs=true: