5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include <stdlib.h> /* for exit() */
35 #ifdef HAVE_SYS_TYPES_H
36 # include <sys/types.h>
39 #ifdef HAVE_SYS_STAT_H
40 # include <sys/stat.h>
51 #ifdef HAVE_ARPA_INET_H
52 #include <arpa/inet.h>
55 #if defined(__APPLE__) && defined(__LP64__)
56 #include <sys/utsname.h>
65 #include "wsutil/wsgetopt.h"
73 # include <sys/prctl.h>
74 # include <sys/capability.h>
77 #include "ringbuffer.h"
78 #include "clopts_common.h"
79 #include "console_io.h"
80 #include "cmdarg_err.h"
81 #include "version_info.h"
83 #include "capture-pcap-util.h"
88 #include "capture-wpcap.h"
89 #include <wsutil/unicode-utils.h>
93 #include <sys/socket.h>
97 #ifdef NEED_INET_V6DEFS_H
98 # include "wsutil/inet_v6defs.h"
101 #include <wsutil/privileges.h>
103 #include "sync_pipe.h"
105 #include "capture_opts.h"
106 #include "capture_ifinfo.h"
107 #include "capture_sync.h"
109 #include "conditions.h"
110 #include "capture_stop_conditions.h"
112 #include "tempfile.h"
114 #include "wsutil/file_util.h"
117 * Get information about libpcap format from "wiretap/libpcap.h".
118 * XXX - can we just use pcap_open_offline() to read the pipe?
120 #include "wiretap/libpcap.h"
122 /**#define DEBUG_DUMPCAP**/
123 /**#define DEBUG_CHILD_DUMPCAP**/
127 #include <conio.h> /* _getch() */
131 #ifdef DEBUG_CHILD_DUMPCAP
132 FILE *debug_log; /* for logging debug messages to */
133 /* a file if DEBUG_CHILD_DUMPCAP */
137 static GAsyncQueue *pcap_queue;
138 static gint64 pcap_queue_bytes;
139 static gint64 pcap_queue_packets;
140 static gint64 pcap_queue_byte_limit = 1024 * 1024;
141 static gint64 pcap_queue_packet_limit = 1000;
143 static gboolean capture_child = FALSE; /* FALSE: standalone call, TRUE: this is an Wireshark capture child */
145 static gchar *sig_pipe_name = NULL;
146 static HANDLE sig_pipe_handle = NULL;
147 static gboolean signal_pipe_check_running(void);
151 static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
152 static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
155 /** Stop a low-level capture (stops the capture child). */
156 static void capture_loop_stop(void);
158 #if !defined (__linux__)
159 #ifndef HAVE_PCAP_BREAKLOOP
161 * We don't have pcap_breakloop(), which is the only way to ensure that
162 * pcap_dispatch(), pcap_loop(), or even pcap_next() or pcap_next_ex()
163 * won't, if the call to read the next packet or batch of packets is
164 * is interrupted by a signal on UN*X, just go back and try again to
167 * On UN*X, we catch SIGINT as a "stop capturing" signal, and, in
168 * the signal handler, set a flag to stop capturing; however, without
169 * a guarantee of that sort, we can't guarantee that we'll stop capturing
170 * if the read will be retried and won't time out if no packets arrive.
172 * Therefore, on at least some platforms, we work around the lack of
173 * pcap_breakloop() by doing a select() on the pcap_t's file descriptor
174 * to wait for packets to arrive, so that we're probably going to be
175 * blocked in the select() when the signal arrives, and can just bail
176 * out of the loop at that point.
178 * However, we don't want to do that on BSD (because "select()" doesn't work
179 * correctly on BPF devices on at least some releases of some flavors of
180 * BSD), and we don't want to do it on Windows (because "select()" is
181 * something for sockets, not for arbitrary handles). (Note that "Windows"
182 * here includes Cygwin; even in its pretend-it's-UNIX environment, we're
183 * using WinPcap, not a UNIX libpcap.)
185 * Fortunately, we don't need to do it on BSD, because the libpcap timeout
186 * on BSD times out even if no packets have arrived, so we'll eventually
187 * exit pcap_dispatch() with an indication that no packets have arrived,
188 * and will break out of the capture loop at that point.
190 * On Windows, we can't send a SIGINT to stop capturing, so none of this
191 * applies in any case.
193 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
194 * want to include it if it's not present on this platform, however.
196 # if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && \
197 !defined(__bsdi__) && !defined(__APPLE__) && !defined(_WIN32) && \
199 # define MUST_DO_SELECT
200 # endif /* avoid select */
201 #endif /* HAVE_PCAP_BREAKLOOP */
203 /* whatever the deal with pcap_breakloop, linux doesn't support timeouts
204 * in pcap_dispatch(); on the other hand, select() works just fine there.
205 * Hence we use a select for that come what may.
207 #define MUST_DO_SELECT
210 /** init the capture filter */
213 INITFILTER_BAD_FILTER,
214 INITFILTER_OTHER_ERROR
215 } initfilter_status_t;
217 typedef struct _pcap_options {
221 #ifdef MUST_DO_SELECT
222 int pcap_fd; /* pcap file descriptor */
229 /* capture pipe (unix only "input file") */
230 gboolean from_cap_pipe; /* TRUE if we are capturing data from a capture pipe */
231 struct pcap_hdr cap_pipe_hdr; /* Pcap header when capturing from a pipe */
232 struct pcaprec_modified_hdr cap_pipe_rechdr; /* Pcap record header when capturing from a pipe */
234 HANDLE cap_pipe_h; /* The handle of the capture pipe */
236 int cap_pipe_fd; /* the file descriptor of the capture pipe */
238 gboolean cap_pipe_modified; /* TRUE if data in the pipe uses modified pcap headers */
239 gboolean cap_pipe_byte_swapped; /* TRUE if data in the pipe is byte swapped */
240 #if defined(USE_THREADS) && defined(_WIN32)
241 char * cap_pipe_buf; /* Pointer to the data buffer we read into */
243 int cap_pipe_bytes_to_read;/* Used by cap_pipe_dispatch */
244 int cap_pipe_bytes_read; /* Used by cap_pipe_dispatch */
246 STATE_EXPECT_REC_HDR,
251 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } cap_pipe_err;
252 #if defined(USE_THREADS) && defined(_WIN32)
253 GMutex *cap_pipe_read_mtx;
254 GAsyncQueue *cap_pipe_pending_q, *cap_pipe_done_q;
258 typedef struct _loop_data {
260 gboolean go; /* TRUE as long as we're supposed to keep capturing */
261 int err; /* if non-zero, error seen while capturing */
262 gint packet_count; /* Number of packets we have already captured */
263 gint packet_max; /* Number of packets we're supposed to capture - 0 means infinite */
264 gint inpkts_to_sync_pipe; /* Packets not already send out to the sync_pipe */
266 gboolean report_packet_count; /* Set by SIGINFO handler; print packet count */
273 guint32 autostop_files;
276 typedef struct _pcap_queue_element {
277 pcap_options *pcap_opts;
278 struct pcap_pkthdr phdr;
280 } pcap_queue_element;
283 * Standard secondary message for unexpected errors.
285 static const char please_report[] =
286 "Please report this to the Wireshark developers.\n"
287 "(This is not a crash; please do not report it as such.)";
290 * This needs to be static, so that the SIGINT handler can clear the "go"
293 static loop_data global_ld;
297 * Timeout, in milliseconds, for reads from the stream of captured packets
298 * from a capture device.
300 * A bug in Mac OS X 10.6 and 10.6.1 causes calls to pcap_open_live(), in
301 * 64-bit applications, with sub-second timeouts not to work. The bug is
302 * fixed in 10.6.2, re-broken in 10.6.3, and again fixed in 10.6.5.
304 #if defined(__APPLE__) && defined(__LP64__)
305 static gboolean need_timeout_workaround;
307 #define CAP_READ_TIMEOUT (need_timeout_workaround ? 1000 : 250)
309 #define CAP_READ_TIMEOUT 250
313 * Timeout, in microseconds, for reads from the stream of captured packets
314 * from a pipe. Pipes don't have the same problem that BPF devices do
315 * in OS X 10.6, 10.6.1, 10.6.3, and 10.6.4, so we always use a timeout
316 * of 250ms, i.e. the same value as CAP_READ_TIMEOUT when not on one
317 * of the offending versions of Snow Leopard.
319 * On Windows this value is converted to milliseconds and passed to
320 * WaitForSingleObject. If it's less than 1000 WaitForSingleObject
321 * will return immediately.
323 #if defined(USE_THREADS) && defined(_WIN32)
324 #define PIPE_READ_TIMEOUT 100000
326 #define PIPE_READ_TIMEOUT 250000
329 #define WRITER_THREAD_TIMEOUT 100000 /* usecs */
332 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
333 const char *message, gpointer user_data _U_);
335 /* capture related options */
336 static capture_options global_capture_opts;
337 static gboolean quiet = FALSE;
338 static gboolean use_threads = FALSE;
340 static void capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
342 static void capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
344 static void capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
345 int err, gboolean is_close);
347 static void WS_MSVC_NORETURN exit_main(int err) G_GNUC_NORETURN;
349 static void report_new_capture_file(const char *filename);
350 static void report_packet_count(int packet_count);
351 static void report_packet_drops(guint32 received, guint32 drops, gchar *name);
352 static void report_capture_error(const char *error_msg, const char *secondary_error_msg);
353 static void report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg);
355 #define MSG_MAX_LENGTH 4096
358 print_usage(gboolean print_ver)
365 "Dumpcap " VERSION "%s\n"
366 "Capture network packets and dump them into a libpcap file.\n"
367 "See http://www.wireshark.org for more information.\n",
368 wireshark_svnversion);
372 fprintf(output, "\nUsage: dumpcap [options] ...\n");
373 fprintf(output, "\n");
374 fprintf(output, "Capture interface:\n");
375 fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
376 fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
377 fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
378 fprintf(output, " -p don't capture in promiscuous mode\n");
379 #ifdef HAVE_PCAP_CREATE
380 fprintf(output, " -I capture in monitor mode, if available\n");
382 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
383 fprintf(output, " -B <buffer size> size of kernel buffer (def: 1MB)\n");
385 fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
386 fprintf(output, " -D print list of interfaces and exit\n");
387 fprintf(output, " -L print list of link-layer types of iface and exit\n");
388 #ifdef HAVE_BPF_IMAGE
389 fprintf(output, " -d print generated BPF code for capture filter\n");
391 fprintf(output, " -S print statistics for each interface once every second\n");
392 fprintf(output, " -M for -D, -L, and -S, produce machine-readable output\n");
393 fprintf(output, "\n");
394 #ifdef HAVE_PCAP_REMOTE
395 fprintf(output, "\nRPCAP options:\n");
396 fprintf(output, " -r don't ignore own RPCAP traffic in capture\n");
397 fprintf(output, " -u use UDP for RPCAP data transfer\n");
398 fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
399 #ifdef HAVE_PCAP_SETSAMPLING
400 fprintf(output, " -m <sampling type> use packet sampling\n");
401 fprintf(output, " count:NUM - capture one packet of every NUM\n");
402 fprintf(output, " timer:NUM - capture no more than 1 packet in NUM ms\n");
405 fprintf(output, "Stop conditions:\n");
406 fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
407 fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
408 fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
409 fprintf(output, " files:NUM - stop after NUM files\n");
410 /*fprintf(output, "\n");*/
411 fprintf(output, "Output (files):\n");
412 fprintf(output, " -w <filename> name of file to save (def: tempfile)\n");
413 fprintf(output, " -g enable group read access on the output file(s)\n");
414 fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
415 fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
416 fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
417 fprintf(output, " -n use pcapng format instead of pcap\n");
418 /*fprintf(output, "\n");*/
419 fprintf(output, "Miscellaneous:\n");
421 fprintf(output, " -t use a separate thread per interface\n");
423 fprintf(output, " -q don't report packet capture counts\n");
424 fprintf(output, " -v print version information and exit\n");
425 fprintf(output, " -h display this help and exit\n");
426 fprintf(output, "\n");
427 fprintf(output, "Example: dumpcap -i eth0 -a duration:60 -w output.pcap\n");
428 fprintf(output, "\"Capture network packets from interface eth0 until 60s passed into output.pcap\"\n");
429 fprintf(output, "\n");
430 fprintf(output, "Use Ctrl-C to stop capturing at any time.\n");
434 show_version(GString *comp_info_str, GString *runtime_info_str)
437 "Dumpcap " VERSION "%s\n"
442 "See http://www.wireshark.org for more information.\n",
443 wireshark_svnversion, get_copyright_info() ,comp_info_str->str, runtime_info_str->str);
447 * Print to the standard error. This is a command-line tool, so there's
448 * no need to pop up a console.
451 vfprintf_stderr(const char *fmt, va_list ap)
453 vfprintf(stderr, fmt, ap);
457 fprintf_stderr(const char *fmt, ...)
462 vfprintf_stderr(fmt, ap);
467 * Report an error in command-line arguments.
470 cmdarg_err(const char *fmt, ...)
476 /* Generate a 'special format' message back to parent */
478 msg = g_strdup_vprintf(fmt, ap);
479 sync_pipe_errmsg_to_parent(2, msg, "");
484 fprintf(stderr, "dumpcap: ");
485 vfprintf(stderr, fmt, ap);
486 fprintf(stderr, "\n");
492 * Report additional information for an error in command-line arguments.
495 cmdarg_err_cont(const char *fmt, ...)
502 msg = g_strdup_vprintf(fmt, ap);
503 sync_pipe_errmsg_to_parent(2, msg, "");
508 vfprintf(stderr, fmt, ap);
509 fprintf(stderr, "\n");
516 #if 0 /* Set to enable capability debugging */
517 /* see 'man cap_to_text()' for explanation of output */
518 /* '=' means 'all= ' ie: no capabilities */
519 /* '=ip' means 'all=ip' ie: all capabilities are permissible and inheritable */
521 print_caps(const char *pfx) {
522 cap_t caps = cap_get_proc();
523 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
524 "%s: EUID: %d Capabilities: %s", pfx,
525 geteuid(), cap_to_text(caps, NULL));
528 print_caps(const char *pfx _U_) {
533 relinquish_all_capabilities(void)
535 /* Drop any and all capabilities this process may have. */
536 /* Allowed whether or not process has any privileges. */
537 cap_t caps = cap_init(); /* all capabilities initialized to off */
538 print_caps("Pre-clear");
539 if (cap_set_proc(caps)) {
540 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
542 print_caps("Post-clear");
548 open_capture_device(interface_options *interface_opts,
549 char (*open_err_str)[PCAP_ERRBUF_SIZE])
552 #ifdef HAVE_PCAP_CREATE
555 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
556 struct pcap_rmtauth auth;
559 /* Open the network interface to capture from it.
560 Some versions of libpcap may put warnings into the error buffer
561 if they succeed; to tell if that's happened, we have to clear
562 the error buffer, and check if it's still a null string. */
563 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Entering open_capture_device().");
564 (*open_err_str)[0] = '\0';
565 #if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
567 * If we're opening a remote device, use pcap_open(); that's currently
568 * the only open routine that supports remote devices.
570 if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
571 auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
572 RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
573 auth.username = interface_opts->auth_username;
574 auth.password = interface_opts->auth_password;
576 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
577 "Calling pcap_open() using name %s, snaplen %d, promisc_mode %d, datatx_udp %d, nocap_rpcap %d.",
578 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode,
579 interface_opts->datatx_udp, interface_opts->nocap_rpcap);
580 pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
582 (interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
583 (interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
584 (interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
585 CAP_READ_TIMEOUT, &auth, *open_err_str);
586 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
587 "pcap_open() returned %p.", (void *)pcap_h);
592 * If we're not opening a remote device, use pcap_create() and
593 * pcap_activate() if we have them, so that we can set the buffer
594 * size, otherwise use pcap_open_live().
596 #ifdef HAVE_PCAP_CREATE
597 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
598 "Calling pcap_create() using %s.", interface_opts->name);
599 pcap_h = pcap_create(interface_opts->name, *open_err_str);
600 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
601 "pcap_create() returned %p.", (void *)pcap_h);
602 if (pcap_h != NULL) {
603 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
604 "Calling pcap_set_snaplen() with snaplen %d.", interface_opts->snaplen);
605 pcap_set_snaplen(pcap_h, interface_opts->snaplen);
606 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
607 "Calling pcap_set_snaplen() with promisc_mode %d.", interface_opts->promisc_mode);
608 pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
609 pcap_set_timeout(pcap_h, CAP_READ_TIMEOUT);
611 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
612 "buffersize %d.", interface_opts->buffer_size);
613 if (interface_opts->buffer_size > 1) {
614 pcap_set_buffer_size(pcap_h, interface_opts->buffer_size * 1024 * 1024);
616 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
617 "monitor_mode %d.", interface_opts->monitor_mode);
618 if (interface_opts->monitor_mode)
619 pcap_set_rfmon(pcap_h, 1);
620 err = pcap_activate(pcap_h);
621 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
622 "pcap_activate() returned %d.", err);
624 /* Failed to activate, set to NULL */
625 if (err == PCAP_ERROR)
626 g_strlcpy(*open_err_str, pcap_geterr(pcap_h), sizeof *open_err_str);
628 g_strlcpy(*open_err_str, pcap_statustostr(err), sizeof *open_err_str);
634 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
635 "pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
636 interface_opts->name, interface_opts->snaplen, interface_opts->promisc_mode);
637 pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
638 interface_opts->promisc_mode, CAP_READ_TIMEOUT,
640 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
641 "pcap_open_live() returned %p.", (void *)pcap_h);
644 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
649 get_capture_device_open_failure_messages(const char *open_err_str,
655 char *errmsg, size_t errmsg_len,
656 char *secondary_errmsg,
657 size_t secondary_errmsg_len)
659 const char *libpcap_warn;
660 static const char ppamsg[] = "can't find PPA for ";
662 /* If we got a "can't find PPA for X" message, warn the user (who
663 is running dumcap on HP-UX) that they don't have a version of
664 libpcap that properly handles HP-UX (libpcap 0.6.x and later
665 versions, which properly handle HP-UX, say "can't find /dev/dlpi
666 PPA for X" rather than "can't find PPA for X"). */
667 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
670 "You are running (T)Wireshark with a version of the libpcap library\n"
671 "that doesn't handle HP-UX network devices well; this means that\n"
672 "(T)Wireshark may not be able to capture packets.\n"
674 "To fix this, you should install libpcap 0.6.2, or a later version\n"
675 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
676 "packaged binary form from the Software Porting And Archive Centre\n"
677 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
678 "at the URL lists a number of mirror sites.";
681 g_snprintf(errmsg, (gulong) errmsg_len,
682 "The capture session could not be initiated (%s).", open_err_str);
684 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
685 "Please check to make sure you have sufficient permissions, and that you have "
686 "the proper interface or pipe specified.%s", libpcap_warn);
688 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len,
690 "Please check that \"%s\" is the proper interface.\n"
693 "Help can be found at:\n"
695 " http://wiki.wireshark.org/WinPcap\n"
696 " http://wiki.wireshark.org/CaptureSetup\n",
701 /* Set the data link type on a pcap. */
703 set_pcap_linktype(pcap_t *pcap_h, int linktype,
704 #ifdef HAVE_PCAP_SET_DATALINK
709 char *errmsg, size_t errmsg_len,
710 char *secondary_errmsg, size_t secondary_errmsg_len)
712 char *set_linktype_err_str;
715 return TRUE; /* just use the default */
716 #ifdef HAVE_PCAP_SET_DATALINK
717 if (pcap_set_datalink(pcap_h, linktype) == 0)
718 return TRUE; /* no error */
719 set_linktype_err_str = pcap_geterr(pcap_h);
721 /* Let them set it to the type it is; reject any other request. */
722 if (get_pcap_linktype(pcap_h, name) == linktype)
723 return TRUE; /* no error */
724 set_linktype_err_str =
725 "That DLT isn't one of the DLTs supported by this device";
727 g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type (%s).",
728 set_linktype_err_str);
730 * If the error isn't "XXX is not one of the DLTs supported by this device",
731 * tell the user to tell the Wireshark developers about it.
733 if (strstr(set_linktype_err_str, "is not one of the DLTs supported by this device") == NULL)
734 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
736 secondary_errmsg[0] = '\0';
741 compile_capture_filter(const char *iface, pcap_t *pcap_h,
742 struct bpf_program *fcode, const char *cfilter)
744 bpf_u_int32 netnum, netmask;
745 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
747 if (pcap_lookupnet(iface, &netnum, &netmask, lookup_net_err_str) < 0) {
749 * Well, we can't get the netmask for this interface; it's used
750 * only for filters that check for broadcast IP addresses, so
751 * we just punt and use 0. It might be nice to warn the user,
752 * but that's a pain in a GUI application, as it'd involve popping
753 * up a message box, and it's not clear how often this would make
754 * a difference (only filters that check for IP broadcast addresses
758 "Warning: Couldn't obtain netmask info (%s).", lookup_net_err_str);*/
763 * Sigh. Older versions of libpcap don't properly declare the
764 * third argument to pcap_compile() as a const pointer. Cast
767 if (pcap_compile(pcap_h, fcode, (char *)cfilter, 1, netmask) < 0)
772 #ifdef HAVE_BPF_IMAGE
774 show_filter_code(capture_options *capture_opts)
776 interface_options interface_opts;
778 gchar open_err_str[PCAP_ERRBUF_SIZE];
779 char errmsg[MSG_MAX_LENGTH+1];
780 char secondary_errmsg[MSG_MAX_LENGTH+1];
781 struct bpf_program fcode;
782 struct bpf_insn *insn;
786 for (j = 0; j < capture_opts->ifaces->len; j++) {
787 interface_opts = g_array_index(capture_opts->ifaces, interface_options, j);
788 pcap_h = open_capture_device(&interface_opts, &open_err_str);
789 if (pcap_h == NULL) {
790 /* Open failed; get messages */
791 get_capture_device_open_failure_messages(open_err_str,
793 errmsg, sizeof errmsg,
795 sizeof secondary_errmsg);
796 /* And report them */
797 report_capture_error(errmsg, secondary_errmsg);
801 /* Set the link-layer type. */
802 if (!set_pcap_linktype(pcap_h, interface_opts.linktype, interface_opts.name,
803 errmsg, sizeof errmsg,
804 secondary_errmsg, sizeof secondary_errmsg)) {
806 report_capture_error(errmsg, secondary_errmsg);
810 /* OK, try to compile the capture filter. */
811 if (!compile_capture_filter(interface_opts.name, pcap_h, &fcode,
812 interface_opts.cfilter)) {
814 report_cfilter_error(capture_opts, j, errmsg);
819 /* Now print the filter code. */
820 insn = fcode.bf_insns;
822 for (i = 0; i < fcode.bf_len; insn++, i++)
823 printf("%s\n", bpf_image(insn, i));
825 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
826 /* to remove any suid privileges. */
827 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
828 /* (euid/egid have already previously been set to ruid/rgid. */
829 /* (See comment in main() for details) */
831 relinquish_special_privs_perm();
833 relinquish_all_capabilities();
836 /* Let our parent know we succeeded. */
837 pipe_write_block(2, SP_SUCCESS, NULL);
844 * capture_interface_list() is expected to do the right thing to get
845 * a list of interfaces.
847 * In most of the programs in the Wireshark suite, "the right thing"
848 * is to run dumpcap and ask it for the list, because dumpcap may
849 * be the only program in the suite with enough privileges to get
852 * In dumpcap itself, however, we obviously can't run dumpcap to
853 * ask for the list. Therefore, our capture_interface_list() should
854 * just call get_interface_list().
857 capture_interface_list(int *err, char **err_str)
859 return get_interface_list(err, err_str);
863 * Get the data-link type for a libpcap device.
864 * This works around AIX 5.x's non-standard and incompatible-with-the-
865 * rest-of-the-universe libpcap.
868 get_pcap_linktype(pcap_t *pch, const char *devname
876 const char *ifacename;
879 linktype = pcap_datalink(pch);
883 * The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
884 * rather than DLT_ values for link-layer types; the ifType values
885 * for LAN devices are:
892 * and the ifType value for a loopback device is 24.
894 * The AIX names for LAN devices begin with:
901 * and the AIX names for loopback devices begin with "lo".
903 * (The difference between "Ethernet" and "802.3" is presumably
904 * whether packets have an Ethernet header, with a packet type,
905 * or an 802.3 header, with a packet length, followed by an 802.2
906 * header and possibly a SNAP header.)
908 * If the device name matches "linktype" interpreted as an ifType
909 * value, rather than as a DLT_ value, we will assume this is AIX's
910 * non-standard, incompatible libpcap, rather than a standard libpcap,
911 * and will map the link-layer type to the standard DLT_ value for
912 * that link-layer type, as that's what the rest of Wireshark expects.
914 * (This means the capture files won't be readable by a tcpdump
915 * linked with AIX's non-standard libpcap, but so it goes. They
916 * *will* be readable by standard versions of tcpdump, Wireshark,
919 * XXX - if we conclude we're using AIX libpcap, should we also
920 * set a flag to cause us to assume the time stamps are in
921 * seconds-and-nanoseconds form, and to convert them to
922 * seconds-and-microseconds form before processing them and
927 * Find the last component of the device name, which is the
930 ifacename = strchr(devname, '/');
931 if (ifacename == NULL)
934 /* See if it matches any of the LAN device names. */
935 if (strncmp(ifacename, "en", 2) == 0) {
938 * That's the RFC 1573 value for Ethernet; map it to DLT_EN10MB.
942 } else if (strncmp(ifacename, "et", 2) == 0) {
945 * That's the RFC 1573 value for 802.3; map it to DLT_EN10MB.
946 * (libpcap, tcpdump, Wireshark, etc. don't care if it's Ethernet
951 } else if (strncmp(ifacename, "tr", 2) == 0) {
954 * That's the RFC 1573 value for 802.5 (Token Ring); map it to
955 * DLT_IEEE802, which is what's used for Token Ring.
959 } else if (strncmp(ifacename, "fi", 2) == 0) {
960 if (linktype == 15) {
962 * That's the RFC 1573 value for FDDI; map it to DLT_FDDI.
966 } else if (strncmp(ifacename, "lo", 2) == 0) {
967 if (linktype == 24) {
969 * That's the RFC 1573 value for "software loopback" devices; map it
970 * to DLT_NULL, which is what's used for loopback devices on BSD.
980 static data_link_info_t *
981 create_data_link_info(int dlt)
983 data_link_info_t *data_link_info;
986 data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
987 data_link_info->dlt = dlt;
988 text = pcap_datalink_val_to_name(dlt);
990 data_link_info->name = g_strdup(text);
992 data_link_info->name = g_strdup_printf("DLT %d", dlt);
993 text = pcap_datalink_val_to_description(dlt);
995 data_link_info->description = g_strdup(text);
997 data_link_info->description = NULL;
998 return data_link_info;
1002 * Get the capabilities of a network device.
1004 static if_capabilities_t *
1005 get_if_capabilities(const char *devname, gboolean monitor_mode
1006 #ifndef HAVE_PCAP_CREATE
1011 if_capabilities_t *caps;
1012 char errbuf[PCAP_ERRBUF_SIZE];
1014 #ifdef HAVE_PCAP_CREATE
1018 #ifdef HAVE_PCAP_LIST_DATALINKS
1022 data_link_info_t *data_link_info;
1025 * Allocate the interface capabilities structure.
1027 caps = g_malloc(sizeof *caps);
1029 #ifdef HAVE_PCAP_OPEN
1030 pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1031 caps->can_set_rfmon = FALSE;
1033 if (err_str != NULL)
1034 *err_str = g_strdup(errbuf);
1038 #elif defined(HAVE_PCAP_CREATE)
1039 pch = pcap_create(devname, errbuf);
1041 if (err_str != NULL)
1042 *err_str = g_strdup(errbuf);
1046 status = pcap_can_set_rfmon(pch);
1049 if (status == PCAP_ERROR)
1050 *err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
1053 *err_str = g_strdup(pcap_statustostr(status));
1059 caps->can_set_rfmon = FALSE;
1060 else if (status == 1) {
1061 caps->can_set_rfmon = TRUE;
1063 pcap_set_rfmon(pch, 1);
1065 if (err_str != NULL) {
1066 *err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
1074 status = pcap_activate(pch);
1076 /* Error. We ignore warnings (status > 0). */
1077 if (err_str != NULL) {
1078 if (status == PCAP_ERROR)
1079 *err_str = g_strdup_printf("pcap_activate() failed: %s",
1082 *err_str = g_strdup(pcap_statustostr(status));
1089 pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
1090 caps->can_set_rfmon = FALSE;
1092 if (err_str != NULL)
1093 *err_str = g_strdup(errbuf);
1098 deflt = get_pcap_linktype(pch, devname);
1099 #ifdef HAVE_PCAP_LIST_DATALINKS
1100 nlt = pcap_list_datalinks(pch, &linktypes);
1101 if (nlt == 0 || linktypes == NULL) {
1103 if (err_str != NULL)
1104 *err_str = NULL; /* an empty list doesn't mean an error */
1107 caps->data_link_types = NULL;
1108 for (i = 0; i < nlt; i++) {
1109 data_link_info = create_data_link_info(linktypes[i]);
1112 * XXX - for 802.11, make the most detailed 802.11
1113 * version the default, rather than the one the
1114 * device has as the default?
1116 if (linktypes[i] == deflt)
1117 caps->data_link_types = g_list_prepend(caps->data_link_types,
1120 caps->data_link_types = g_list_append(caps->data_link_types,
1123 #ifdef HAVE_PCAP_FREE_DATALINKS
1124 pcap_free_datalinks(linktypes);
1127 * In Windows, there's no guarantee that if you have a library
1128 * built with one version of the MSVC++ run-time library, and
1129 * it returns a pointer to allocated data, you can free that
1130 * data from a program linked with another version of the
1131 * MSVC++ run-time library.
1133 * This is not an issue on UN*X.
1135 * See the mail threads starting at
1137 * http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
1141 * http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
1144 #define xx_free free /* hack so checkAPIs doesn't complain */
1147 #endif /* HAVE_PCAP_FREE_DATALINKS */
1148 #else /* HAVE_PCAP_LIST_DATALINKS */
1150 data_link_info = create_data_link_info(deflt);
1151 caps->data_link_types = g_list_append(caps->data_link_types,
1153 #endif /* HAVE_PCAP_LIST_DATALINKS */
1157 if (err_str != NULL)
1162 #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
1164 print_machine_readable_interfaces(GList *if_list)
1171 char addr_str[ADDRSTRLEN];
1173 if (capture_child) {
1174 /* Let our parent know we succeeded. */
1175 pipe_write_block(2, SP_SUCCESS, NULL);
1178 i = 1; /* Interface id number */
1179 for (if_entry = g_list_first(if_list); if_entry != NULL;
1180 if_entry = g_list_next(if_entry)) {
1181 if_info = (if_info_t *)if_entry->data;
1182 printf("%d. %s", i++, if_info->name);
1185 * Print the contents of the if_entry struct in a parseable format.
1186 * Each if_entry element is tab-separated. Addresses are comma-
1189 /* XXX - Make sure our description doesn't contain a tab */
1190 if (if_info->description != NULL)
1191 printf("\t%s\t", if_info->description);
1195 for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
1196 addr = g_slist_next(addr)) {
1197 if (addr != g_slist_nth(if_info->addrs, 0))
1200 if_addr = (if_addr_t *)addr->data;
1201 switch(if_addr->ifat_type) {
1203 if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
1205 printf("%s", addr_str);
1207 printf("<unknown IPv4>");
1211 if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
1212 addr_str, ADDRSTRLEN)) {
1213 printf("%s", addr_str);
1215 printf("<unknown IPv6>");
1219 printf("<type unknown %u>", if_addr->ifat_type);
1223 if (if_info->loopback)
1224 printf("\tloopback");
1226 printf("\tnetwork");
1233 * If you change the machine-readable output format of this function,
1234 * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly!
1237 print_machine_readable_if_capabilities(if_capabilities_t *caps)
1240 data_link_info_t *data_link_info;
1241 const gchar *desc_str;
1243 if (capture_child) {
1244 /* Let our parent know we succeeded. */
1245 pipe_write_block(2, SP_SUCCESS, NULL);
1248 if (caps->can_set_rfmon)
1252 for (lt_entry = caps->data_link_types; lt_entry != NULL;
1253 lt_entry = g_list_next(lt_entry)) {
1254 data_link_info = (data_link_info_t *)lt_entry->data;
1255 if (data_link_info->description != NULL)
1256 desc_str = data_link_info->description;
1258 desc_str = "(not supported)";
1259 printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
1269 /* Print the number of packets captured for each interface until we're killed. */
1271 print_statistics_loop(gboolean machine_readable)
1273 GList *if_list, *if_entry, *stat_list = NULL, *stat_entry;
1279 char errbuf[PCAP_ERRBUF_SIZE];
1280 struct pcap_stat ps;
1282 if_list = get_interface_list(&err, &err_str);
1283 if (if_list == NULL) {
1285 case CANT_GET_INTERFACE_LIST:
1286 cmdarg_err("%s", err_str);
1290 case NO_INTERFACES_FOUND:
1291 cmdarg_err("There are no interfaces on which a capture can be done");
1297 for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) {
1298 if_info = (if_info_t *)if_entry->data;
1299 #ifdef HAVE_PCAP_OPEN
1300 pch = pcap_open(if_info->name, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
1302 pch = pcap_open_live(if_info->name, MIN_PACKET_SIZE, 0, 0, errbuf);
1306 if_stat = (if_stat_t *)g_malloc(sizeof(if_stat_t));
1307 if_stat->name = g_strdup(if_info->name);
1309 stat_list = g_list_append(stat_list, if_stat);
1314 cmdarg_err("There are no interfaces on which a capture can be done");
1318 if (capture_child) {
1319 /* Let our parent know we succeeded. */
1320 pipe_write_block(2, SP_SUCCESS, NULL);
1323 if (!machine_readable) {
1324 printf("%-15s %10s %10s\n", "Interface", "Received",
1328 global_ld.go = TRUE;
1329 while (global_ld.go) {
1330 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1331 if_stat = (if_stat_t *)stat_entry->data;
1332 pcap_stats(if_stat->pch, &ps);
1334 if (!machine_readable) {
1335 printf("%-15s %10u %10u\n", if_stat->name,
1336 ps.ps_recv, ps.ps_drop);
1338 printf("%s\t%u\t%u\n", if_stat->name,
1339 ps.ps_recv, ps.ps_drop);
1350 /* XXX - Not reached. Should we look for 'q' in stdin? */
1351 for (stat_entry = g_list_first(stat_list); stat_entry != NULL; stat_entry = g_list_next(stat_entry)) {
1352 if_stat = (if_stat_t *)stat_entry->data;
1353 pcap_close(if_stat->pch);
1354 g_free(if_stat->name);
1357 g_list_free(stat_list);
1358 free_interface_list(if_list);
1366 capture_cleanup_handler(DWORD dwCtrlType)
1368 /* CTRL_C_EVENT is sort of like SIGINT, CTRL_BREAK_EVENT is unique to
1369 Windows, CTRL_CLOSE_EVENT is sort of like SIGHUP, CTRL_LOGOFF_EVENT
1370 is also sort of like SIGHUP, and CTRL_SHUTDOWN_EVENT is sort of
1371 like SIGTERM at least when the machine's shutting down.
1373 For now, if we're running as a command rather than a capture child,
1374 we handle all but CTRL_LOGOFF_EVENT as indications that we should
1375 clean up and quit, just as we handle SIGINT, SIGHUP, and SIGTERM
1376 in that way on UN*X.
1378 If we're not running as a capture child, we might be running as
1379 a service; ignore CTRL_LOGOFF_EVENT, so we keep running after the
1380 user logs out. (XXX - can we explicitly check whether we're
1381 running as a service?) */
1383 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
1384 "Console: Control signal");
1385 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
1386 "Console: Control signal, CtrlType: %u", dwCtrlType);
1388 /* Keep capture running if we're a service and a user logs off */
1389 if (capture_child || (dwCtrlType != CTRL_LOGOFF_EVENT)) {
1390 capture_loop_stop();
1398 capture_cleanup_handler(int signum _U_)
1400 /* On UN*X, we cleanly shut down the capture on SIGINT, SIGHUP, and
1401 SIGTERM. We assume that if the user wanted it to keep running
1402 after they logged out, they'd have nohupped it. */
1404 /* Note: don't call g_log() in the signal handler: if we happened to be in
1405 * g_log() in process context when the signal came in, g_log will detect
1406 * the "recursion" and abort.
1409 capture_loop_stop();
1415 report_capture_count(gboolean reportit)
1417 /* Don't print this if we're a capture child. */
1418 if (!capture_child && reportit) {
1419 fprintf(stderr, "\rPackets captured: %u\n", global_ld.packet_count);
1420 /* stderr could be line buffered */
1428 report_counts_for_siginfo(void)
1430 report_capture_count(quiet);
1431 infoprint = FALSE; /* we just reported it */
1435 report_counts_siginfo(int signum _U_)
1437 int sav_errno = errno;
1439 /* If we've been told to delay printing, just set a flag asking
1440 that we print counts (if we're supposed to), otherwise print
1441 the count of packets captured (if we're supposed to). */
1445 report_counts_for_siginfo();
1448 #endif /* SIGINFO */
1451 exit_main(int status)
1454 /* Shutdown windows sockets */
1457 /* can be helpful for debugging */
1458 #ifdef DEBUG_DUMPCAP
1459 printf("Press any key\n");
1470 * If we were linked with libcap (not libpcap), make sure we have
1471 * CAP_NET_ADMIN and CAP_NET_RAW, then relinquish our permissions.
1472 * (See comment in main() for details)
1475 relinquish_privs_except_capture(void)
1477 /* If 'started_with_special_privs' (ie: suid) then enable for
1478 * ourself the NET_ADMIN and NET_RAW capabilities and then
1479 * drop our suid privileges.
1481 * CAP_NET_ADMIN: Promiscuous mode and a truckload of other
1482 * stuff we don't need (and shouldn't have).
1483 * CAP_NET_RAW: Packet capture (raw sockets).
1486 if (started_with_special_privs()) {
1487 cap_value_t cap_list[2] = { CAP_NET_ADMIN, CAP_NET_RAW };
1488 int cl_len = sizeof(cap_list) / sizeof(cap_value_t);
1490 cap_t caps = cap_init(); /* all capabilities initialized to off */
1492 print_caps("Pre drop, pre set");
1494 if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) {
1495 cmdarg_err("prctl() fail return: %s", g_strerror(errno));
1498 cap_set_flag(caps, CAP_PERMITTED, cl_len, cap_list, CAP_SET);
1499 cap_set_flag(caps, CAP_INHERITABLE, cl_len, cap_list, CAP_SET);
1501 if (cap_set_proc(caps)) {
1502 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1504 print_caps("Pre drop, post set");
1506 relinquish_special_privs_perm();
1508 print_caps("Post drop, pre set");
1509 cap_set_flag(caps, CAP_EFFECTIVE, cl_len, cap_list, CAP_SET);
1510 if (cap_set_proc(caps)) {
1511 cmdarg_err("cap_set_proc() fail return: %s", g_strerror(errno));
1513 print_caps("Post drop, post set");
1519 #endif /* HAVE_LIBCAP */
1521 /* Take care of byte order in the libpcap headers read from pipes.
1522 * (function taken from wiretap/libpcap.c) */
1524 cap_pipe_adjust_header(gboolean byte_swapped, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1527 /* Byte-swap the record header fields. */
1528 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1529 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1530 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1531 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1534 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1535 swapped, in order to match the BPF header layout.
1537 Unfortunately, some files were, according to a comment in the "libpcap"
1538 source, written with version 2.3 in their headers but without the
1539 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1540 would make no sense - we assume that we need to swap them. */
1541 if (hdr->version_major == 2 &&
1542 (hdr->version_minor < 3 ||
1543 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1546 temp = rechdr->orig_len;
1547 rechdr->orig_len = rechdr->incl_len;
1548 rechdr->incl_len = temp;
1552 #if defined(USE_THREADS) && defined(_WIN32)
1554 * Thread function that reads from a pipe and pushes the data
1555 * to the main application thread.
1558 * XXX Right now we use async queues for basic signaling. The main thread
1559 * sets cap_pipe_buf and cap_bytes_to_read, then pushes an item onto
1560 * cap_pipe_pending_q which triggers a read in the cap_pipe_read thread.
1561 * Iff the read is successful cap_pipe_read pushes an item onto
1562 * cap_pipe_done_q, otherwise an error is signaled. No data is passed in
1563 * the queues themselves (yet).
1565 * We might want to move some of the cap_pipe_dispatch logic here so that
1566 * we can let cap_pipe_read run independently, queuing up multiple reads
1567 * for the main thread (and possibly get rid of cap_pipe_read_mtx).
1569 static void *cap_pipe_read(void *arg)
1571 pcap_options *pcap_opts;
1580 pcap_opts = (pcap_options *)arg;
1581 while (pcap_opts->cap_pipe_err == PIPOK) {
1582 g_async_queue_pop(pcap_opts->cap_pipe_pending_q); /* Wait for our cue (ahem) from the main thread */
1583 g_mutex_lock(pcap_opts->cap_pipe_read_mtx);
1585 while (bytes_read < (int) pcap_opts->cap_pipe_bytes_to_read) {
1587 /* If we try to use read() on a named pipe on Windows with partial
1588 * data it appears to return EOF.
1590 res = ReadFile(pcap_opts->cap_pipe_h, pcap_opts->cap_pipe_buf+bytes_read,
1591 pcap_opts->cap_pipe_bytes_to_read - bytes_read,
1596 last_err = GetLastError();
1597 if (last_err == ERROR_MORE_DATA) {
1599 } else if (last_err == ERROR_HANDLE_EOF || last_err == ERROR_BROKEN_PIPE || last_err == ERROR_PIPE_NOT_CONNECTED) {
1600 pcap_opts->cap_pipe_err = PIPEOF;
1604 pcap_opts->cap_pipe_err = PIPERR;
1607 } else if (b == 0 && pcap_opts->cap_pipe_bytes_to_read > 0) {
1608 pcap_opts->cap_pipe_err = PIPEOF;
1613 b = read(pcap_opts->cap_pipe_fd, pcap_opts->cap_pipe_buf+bytes_read,
1614 pcap_opts->cap_pipe_bytes_to_read - bytes_read);
1617 pcap_opts->cap_pipe_err = PIPEOF;
1621 pcap_opts->cap_pipe_err = PIPERR;
1630 pcap_opts->cap_pipe_bytes_read = bytes_read;
1631 if (pcap_opts->cap_pipe_bytes_read >= pcap_opts->cap_pipe_bytes_to_read) {
1632 g_async_queue_push(pcap_opts->cap_pipe_done_q, pcap_opts->cap_pipe_buf); /* Any non-NULL value will do */
1634 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
1640 #if (!(defined(USE_THREADS) && defined(_WIN32))) || defined(MUST_DO_SELECT)
1641 /* Provide select() functionality for a single file descriptor
1642 * on UNIX/POSIX. Windows uses cap_pipe_read via a thread.
1644 * Returns the same values as select.
1647 cap_pipe_select(int pipe_fd)
1650 struct timeval timeout;
1653 FD_SET(pipe_fd, &rfds);
1655 timeout.tv_sec = PIPE_READ_TIMEOUT / 1000000;
1656 timeout.tv_usec = PIPE_READ_TIMEOUT % 1000000;
1658 return select(pipe_fd+1, &rfds, NULL, NULL, &timeout);
1663 /* Mimic pcap_open_live() for pipe captures
1665 * We check if "pipename" is "-" (stdin), a AF_UNIX socket, or a FIFO,
1666 * open it, and read the header.
1668 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1669 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1671 cap_pipe_open_live(char *pipename,
1672 pcap_options *pcap_opts,
1673 struct pcap_hdr *hdr,
1674 char *errmsg, int errmsgl)
1677 ws_statb64 pipe_stat;
1678 struct sockaddr_un sa;
1687 #if !(defined(USE_THREADS) && defined(_WIN32))
1689 unsigned int bytes_read;
1694 pcap_opts->cap_pipe_fd = -1;
1696 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
1698 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: %s", pipename);
1701 * XXX - this blocks until a pcap per-file header has been written to
1702 * the pipe, so it could block indefinitely.
1704 if (strcmp(pipename, "-") == 0) {
1706 fd = 0; /* read from stdin */
1708 pcap_opts->cap_pipe_h = GetStdHandle(STD_INPUT_HANDLE);
1712 if (ws_stat64(pipename, &pipe_stat) < 0) {
1713 if (errno == ENOENT || errno == ENOTDIR)
1714 pcap_opts->cap_pipe_err = PIPNEXIST;
1716 g_snprintf(errmsg, errmsgl,
1717 "The capture session could not be initiated "
1718 "due to error getting information on pipe/socket: %s", g_strerror(errno));
1719 pcap_opts->cap_pipe_err = PIPERR;
1723 if (S_ISFIFO(pipe_stat.st_mode)) {
1724 fd = ws_open(pipename, O_RDONLY | O_NONBLOCK, 0000 /* no creation so don't matter */);
1726 g_snprintf(errmsg, errmsgl,
1727 "The capture session could not be initiated "
1728 "due to error on pipe open: %s", g_strerror(errno));
1729 pcap_opts->cap_pipe_err = PIPERR;
1732 } else if (S_ISSOCK(pipe_stat.st_mode)) {
1733 fd = socket(AF_UNIX, SOCK_STREAM, 0);
1735 g_snprintf(errmsg, errmsgl,
1736 "The capture session could not be initiated "
1737 "due to error on socket create: %s", g_strerror(errno));
1738 pcap_opts->cap_pipe_err = PIPERR;
1741 sa.sun_family = AF_UNIX;
1743 * The Single UNIX Specification says:
1745 * The size of sun_path has intentionally been left undefined.
1746 * This is because different implementations use different sizes.
1747 * For example, 4.3 BSD uses a size of 108, and 4.4 BSD uses a size
1748 * of 104. Since most implementations originate from BSD versions,
1749 * the size is typically in the range 92 to 108.
1751 * Applications should not assume a particular length for sun_path
1752 * or assume that it can hold {_POSIX_PATH_MAX} bytes (256).
1756 * The <sys/un.h> header shall define the sockaddr_un structure,
1757 * which shall include at least the following members:
1759 * sa_family_t sun_family Address family.
1760 * char sun_path[] Socket pathname.
1762 * so we assume that it's an array, with a specified size,
1763 * and that the size reflects the maximum path length.
1765 if (g_strlcpy(sa.sun_path, pipename, sizeof sa.sun_path) > sizeof sa.sun_path) {
1766 /* Path name too long */
1767 g_snprintf(errmsg, errmsgl,
1768 "The capture session coud not be initiated "
1769 "due to error on socket connect: Path name too long");
1770 pcap_opts->cap_pipe_err = PIPERR;
1773 b = connect(fd, (struct sockaddr *)&sa, sizeof sa);
1775 g_snprintf(errmsg, errmsgl,
1776 "The capture session coud not be initiated "
1777 "due to error on socket connect: %s", g_strerror(errno));
1778 pcap_opts->cap_pipe_err = PIPERR;
1782 if (S_ISCHR(pipe_stat.st_mode)) {
1784 * Assume the user specified an interface on a system where
1785 * interfaces are in /dev. Pretend we haven't seen it.
1787 pcap_opts->cap_pipe_err = PIPNEXIST;
1790 g_snprintf(errmsg, errmsgl,
1791 "The capture session could not be initiated because\n"
1792 "\"%s\" is neither an interface nor a socket nor a pipe", pipename);
1793 pcap_opts->cap_pipe_err = PIPERR;
1798 #define PIPE_STR "\\pipe\\"
1799 /* Under Windows, named pipes _must_ have the form
1800 * "\\<server>\pipe\<pipename>". <server> may be "." for localhost.
1802 pncopy = g_strdup(pipename);
1803 if ( (pos=strstr(pncopy, "\\\\")) == pncopy) {
1804 pos = strchr(pncopy + 3, '\\');
1805 if (pos && g_ascii_strncasecmp(pos, PIPE_STR, strlen(PIPE_STR)) != 0)
1812 g_snprintf(errmsg, errmsgl,
1813 "The capture session could not be initiated because\n"
1814 "\"%s\" is neither an interface nor a pipe", pipename);
1815 pcap_opts->cap_pipe_err = PIPNEXIST;
1819 /* Wait for the pipe to appear */
1821 pcap_opts->cap_pipe_h = CreateFile(utf_8to16(pipename), GENERIC_READ, 0, NULL,
1822 OPEN_EXISTING, 0, NULL);
1824 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE)
1827 if (GetLastError() != ERROR_PIPE_BUSY) {
1828 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1829 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1830 g_snprintf(errmsg, errmsgl,
1831 "The capture session on \"%s\" could not be started "
1832 "due to error on pipe open: %s (error %d)",
1833 pipename, utf_16to8(err_str), GetLastError());
1835 pcap_opts->cap_pipe_err = PIPERR;
1839 if (!WaitNamedPipe(utf_8to16(pipename), 30 * 1000)) {
1840 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
1841 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
1842 g_snprintf(errmsg, errmsgl,
1843 "The capture session on \"%s\" timed out during "
1844 "pipe open: %s (error %d)",
1845 pipename, utf_16to8(err_str), GetLastError());
1847 pcap_opts->cap_pipe_err = PIPERR;
1854 pcap_opts->from_cap_pipe = TRUE;
1856 #if !(defined(USE_THREADS) && defined(_WIN32))
1857 /* read the pcap header */
1859 while (bytes_read < sizeof magic) {
1860 sel_ret = cap_pipe_select(fd);
1862 g_snprintf(errmsg, errmsgl,
1863 "Unexpected error from select: %s", g_strerror(errno));
1865 } else if (sel_ret > 0) {
1866 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1869 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1871 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1879 g_thread_create(&cap_pipe_read, pcap_opts, FALSE, NULL);
1881 pcap_opts->cap_pipe_buf = (char *) &magic;
1882 pcap_opts->cap_pipe_bytes_read = 0;
1883 pcap_opts->cap_pipe_bytes_to_read = sizeof(magic);
1884 /* We don't have to worry about cap_pipe_read_mtx here */
1885 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1886 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1887 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1888 if (pcap_opts->cap_pipe_bytes_read == 0)
1889 g_snprintf(errmsg, errmsgl, "End of file on pipe magic during open");
1891 g_snprintf(errmsg, errmsgl, "Error on pipe magic during open: %s",
1900 /* Host that wrote it has our byte order, and was running
1901 a program using either standard or ss990417 libpcap. */
1902 pcap_opts->cap_pipe_byte_swapped = FALSE;
1903 pcap_opts->cap_pipe_modified = FALSE;
1905 case PCAP_MODIFIED_MAGIC:
1906 /* Host that wrote it has our byte order, but was running
1907 a program using either ss990915 or ss991029 libpcap. */
1908 pcap_opts->cap_pipe_byte_swapped = FALSE;
1909 pcap_opts->cap_pipe_modified = TRUE;
1911 case PCAP_SWAPPED_MAGIC:
1912 /* Host that wrote it has a byte order opposite to ours,
1913 and was running a program using either standard or
1914 ss990417 libpcap. */
1915 pcap_opts->cap_pipe_byte_swapped = TRUE;
1916 pcap_opts->cap_pipe_modified = FALSE;
1918 case PCAP_SWAPPED_MODIFIED_MAGIC:
1919 /* Host that wrote it out has a byte order opposite to
1920 ours, and was running a program using either ss990915
1921 or ss991029 libpcap. */
1922 pcap_opts->cap_pipe_byte_swapped = TRUE;
1923 pcap_opts->cap_pipe_modified = TRUE;
1926 /* Not a "libpcap" type we know about. */
1927 g_snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1931 #if !(defined(USE_THREADS) && defined(_WIN32))
1932 /* Read the rest of the header */
1934 while (bytes_read < sizeof(struct pcap_hdr)) {
1935 sel_ret = cap_pipe_select(fd);
1937 g_snprintf(errmsg, errmsgl,
1938 "Unexpected error from select: %s", g_strerror(errno));
1940 } else if (sel_ret > 0) {
1941 b = read(fd, ((char *)hdr)+bytes_read,
1942 sizeof(struct pcap_hdr) - bytes_read);
1945 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1947 g_snprintf(errmsg, errmsgl, "Error on pipe header during open: %s",
1955 pcap_opts->cap_pipe_buf = (char *) hdr;
1956 pcap_opts->cap_pipe_bytes_read = 0;
1957 pcap_opts->cap_pipe_bytes_to_read = sizeof(struct pcap_hdr);
1958 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
1959 g_async_queue_pop(pcap_opts->cap_pipe_done_q);
1960 if (pcap_opts->cap_pipe_bytes_read <= 0) {
1961 if (pcap_opts->cap_pipe_bytes_read == 0)
1962 g_snprintf(errmsg, errmsgl, "End of file on pipe header during open");
1964 g_snprintf(errmsg, errmsgl, "Error on pipe header header during open: %s",
1970 if (pcap_opts->cap_pipe_byte_swapped) {
1971 /* Byte-swap the header fields about which we care. */
1972 hdr->version_major = BSWAP16(hdr->version_major);
1973 hdr->version_minor = BSWAP16(hdr->version_minor);
1974 hdr->snaplen = BSWAP32(hdr->snaplen);
1975 hdr->network = BSWAP32(hdr->network);
1977 pcap_opts->linktype = hdr->network;
1979 if (hdr->version_major < 2) {
1980 g_snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1984 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
1985 pcap_opts->cap_pipe_err = PIPOK;
1987 pcap_opts->cap_pipe_fd = fd;
1992 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_open_live: error %s", errmsg);
1993 pcap_opts->cap_pipe_err = PIPERR;
1996 pcap_opts->cap_pipe_fd = -1;
2003 /* We read one record from the pipe, take care of byte order in the record
2004 * header, write the record to the capture file, and update capture statistics. */
2006 cap_pipe_dispatch(loop_data *ld, pcap_options *pcap_opts, guchar *data, char *errmsg, int errmsgl)
2008 struct pcap_pkthdr phdr;
2009 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
2011 #if defined(USE_THREADS) && defined(_WIN32)
2021 #ifdef LOG_CAPTURE_VERBOSE
2022 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "cap_pipe_dispatch");
2025 switch (pcap_opts->cap_pipe_state) {
2027 case STATE_EXPECT_REC_HDR:
2028 #if defined(USE_THREADS) && defined(_WIN32)
2029 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2032 pcap_opts->cap_pipe_state = STATE_READ_REC_HDR;
2033 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_modified ?
2034 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
2035 pcap_opts->cap_pipe_bytes_read = 0;
2037 #if defined(USE_THREADS) && defined(_WIN32)
2038 pcap_opts->cap_pipe_buf = (char *) &pcap_opts->cap_pipe_rechdr;
2039 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2040 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2045 case STATE_READ_REC_HDR:
2046 #if !(defined(USE_THREADS) && defined(_WIN32))
2047 b = read(pcap_opts->cap_pipe_fd, ((char *)&pcap_opts->cap_pipe_rechdr)+pcap_opts->cap_pipe_bytes_read,
2048 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2051 result = PD_PIPE_EOF;
2053 result = PD_PIPE_ERR;
2056 pcap_opts->cap_pipe_bytes_read += b;
2058 g_get_current_time(&wait_time);
2059 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2060 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2061 if (pcap_opts->cap_pipe_err == PIPEOF) {
2062 result = PD_PIPE_EOF;
2064 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2065 result = PD_PIPE_ERR;
2072 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2074 result = PD_REC_HDR_READ;
2077 case STATE_EXPECT_DATA:
2078 #if defined(USE_THREADS) && defined(_WIN32)
2079 if (g_mutex_trylock(pcap_opts->cap_pipe_read_mtx)) {
2082 pcap_opts->cap_pipe_state = STATE_READ_DATA;
2083 pcap_opts->cap_pipe_bytes_to_read = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2084 pcap_opts->cap_pipe_bytes_read = 0;
2086 #if defined(USE_THREADS) && defined(_WIN32)
2087 pcap_opts->cap_pipe_buf = (char *) data;
2088 g_async_queue_push(pcap_opts->cap_pipe_pending_q, pcap_opts->cap_pipe_buf);
2089 g_mutex_unlock(pcap_opts->cap_pipe_read_mtx);
2094 case STATE_READ_DATA:
2095 #if !(defined(USE_THREADS) && defined(_WIN32))
2096 b = read(pcap_opts->cap_pipe_fd, data+pcap_opts->cap_pipe_bytes_read,
2097 pcap_opts->cap_pipe_bytes_to_read - pcap_opts->cap_pipe_bytes_read);
2100 result = PD_PIPE_EOF;
2102 result = PD_PIPE_ERR;
2105 pcap_opts->cap_pipe_bytes_read += b;
2107 g_get_current_time(&wait_time);
2108 g_time_val_add(&wait_time, PIPE_READ_TIMEOUT);
2109 q_status = g_async_queue_timed_pop(pcap_opts->cap_pipe_done_q, &wait_time);
2110 if (pcap_opts->cap_pipe_err == PIPEOF) {
2111 result = PD_PIPE_EOF;
2113 } else if (pcap_opts->cap_pipe_err == PIPERR) {
2114 result = PD_PIPE_ERR;
2121 if ((pcap_opts->cap_pipe_bytes_read) < pcap_opts->cap_pipe_bytes_to_read)
2123 result = PD_DATA_READ;
2127 g_snprintf(errmsg, errmsgl, "cap_pipe_dispatch: invalid state");
2130 } /* switch (ld->cap_pipe_state) */
2133 * We've now read as much data as we were expecting, so process it.
2137 case PD_REC_HDR_READ:
2138 /* We've read the header. Take care of byte order. */
2139 cap_pipe_adjust_header(pcap_opts->cap_pipe_byte_swapped, &pcap_opts->cap_pipe_hdr,
2140 &pcap_opts->cap_pipe_rechdr.hdr);
2141 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
2142 g_snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
2143 ld->packet_count+1, pcap_opts->cap_pipe_rechdr.hdr.incl_len);
2147 if (pcap_opts->cap_pipe_rechdr.hdr.incl_len) {
2148 pcap_opts->cap_pipe_state = STATE_EXPECT_DATA;
2151 /* no data to read? fall through */
2154 /* Fill in a "struct pcap_pkthdr", and process the packet. */
2155 phdr.ts.tv_sec = pcap_opts->cap_pipe_rechdr.hdr.ts_sec;
2156 phdr.ts.tv_usec = pcap_opts->cap_pipe_rechdr.hdr.ts_usec;
2157 phdr.caplen = pcap_opts->cap_pipe_rechdr.hdr.incl_len;
2158 phdr.len = pcap_opts->cap_pipe_rechdr.hdr.orig_len;
2161 capture_loop_queue_packet_cb((u_char *)pcap_opts, &phdr, data);
2163 capture_loop_write_packet_cb((u_char *)pcap_opts, &phdr, data);
2165 pcap_opts->cap_pipe_state = STATE_EXPECT_REC_HDR;
2169 pcap_opts->cap_pipe_err = PIPEOF;
2174 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
2175 NULL, GetLastError(), 0, (LPTSTR) &err_str, 0, NULL);
2176 g_snprintf(errmsg, errmsgl,
2177 "Error reading from pipe: %s (error %d)",
2178 utf_16to8(err_str), GetLastError());
2181 g_snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
2189 pcap_opts->cap_pipe_err = PIPERR;
2190 /* Return here rather than inside the switch to prevent GCC warning */
2195 /** Open the capture input file (pcap or capture pipe).
2196 * Returns TRUE if it succeeds, FALSE otherwise. */
2198 capture_loop_open_input(capture_options *capture_opts, loop_data *ld,
2199 char *errmsg, size_t errmsg_len,
2200 char *secondary_errmsg, size_t secondary_errmsg_len)
2202 gchar open_err_str[PCAP_ERRBUF_SIZE];
2203 gchar *sync_msg_str;
2204 interface_options interface_opts;
2205 pcap_options *pcap_opts;
2209 gchar *sync_secondary_msg_str;
2210 WORD wVersionRequested;
2214 /* XXX - opening Winsock on tshark? */
2216 /* Initialize Windows Socket if we are in a WIN32 OS
2217 This needs to be done before querying the interface for network/netmask */
2219 /* XXX - do we really require 1.1 or earlier?
2220 Are there any versions that support only 2.0 or higher? */
2221 wVersionRequested = MAKEWORD(1, 1);
2222 err = WSAStartup(wVersionRequested, &wsaData);
2226 case WSASYSNOTREADY:
2227 g_snprintf(errmsg, (gulong) errmsg_len,
2228 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
2231 case WSAVERNOTSUPPORTED:
2232 g_snprintf(errmsg, (gulong) errmsg_len,
2233 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
2234 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
2237 case WSAEINPROGRESS:
2238 g_snprintf(errmsg, (gulong) errmsg_len,
2239 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
2243 g_snprintf(errmsg, (gulong) errmsg_len,
2244 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
2248 g_snprintf(errmsg, (gulong) errmsg_len,
2249 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
2253 g_snprintf(errmsg, (gulong) errmsg_len,
2254 "Couldn't initialize Windows Sockets: error %d", err);
2257 g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
2261 if ((use_threads == FALSE) &&
2262 (capture_opts->ifaces->len > 1)) {
2263 g_snprintf(errmsg, (gulong) errmsg_len,
2264 "Using threads is required for capturing on mulitple interfaces!");
2268 for (i = 0; i < capture_opts->ifaces->len; i++) {
2269 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2270 pcap_opts = (pcap_options *)g_malloc(sizeof (pcap_options));
2271 if (pcap_opts == NULL) {
2272 g_snprintf(errmsg, (gulong) errmsg_len,
2273 "Could not allocate memory.");
2276 pcap_opts->received = 0;
2277 pcap_opts->dropped = 0;
2278 pcap_opts->pcap_h = NULL;
2279 #ifdef MUST_DO_SELECT
2280 pcap_opts->pcap_fd = -1;
2282 pcap_opts->pcap_err = FALSE;
2283 pcap_opts->interface_id = i;
2284 pcap_opts->tid = NULL;
2285 pcap_opts->snaplen = 0;
2286 pcap_opts->linktype = -1;
2287 pcap_opts->from_cap_pipe = FALSE;
2288 memset(&pcap_opts->cap_pipe_hdr, 0, sizeof(struct pcap_hdr));
2289 memset(&pcap_opts->cap_pipe_rechdr, 0, sizeof(struct pcaprec_modified_hdr));
2291 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2293 pcap_opts->cap_pipe_fd = -1;
2295 pcap_opts->cap_pipe_modified = FALSE;
2296 pcap_opts->cap_pipe_byte_swapped = FALSE;
2297 #if defined(USE_THREADS) && defined(_WIN32)
2298 pcap_opts->cap_pipe_buf = NULL;
2300 pcap_opts->cap_pipe_bytes_to_read = 0;
2301 pcap_opts->cap_pipe_bytes_read = 0;
2302 pcap_opts->cap_pipe_state = 0;
2303 pcap_opts->cap_pipe_err = PIPOK;
2304 #if defined(USE_THREADS) && defined(_WIN32)
2305 pcap_opts->cap_pipe_read_mtx = g_mutex_new();
2306 pcap_opts->cap_pipe_pending_q = g_async_queue_new();
2307 pcap_opts->cap_pipe_done_q = g_async_queue_new();
2309 g_array_append_val(ld->pcaps, pcap_opts);
2311 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_input : %s", interface_opts.name);
2312 pcap_opts->pcap_h = open_capture_device(&interface_opts, &open_err_str);
2314 if (pcap_opts->pcap_h != NULL) {
2315 /* we've opened "iface" as a network device */
2317 /* try to set the capture buffer size */
2318 if (interface_opts.buffer_size > 1 &&
2319 pcap_setbuff(pcap_opts->pcap_h, interface_opts.buffer_size * 1024 * 1024) != 0) {
2320 sync_secondary_msg_str = g_strdup_printf(
2321 "The capture buffer size of %dMB seems to be too high for your machine,\n"
2322 "the default of 1MB will be used.\n"
2324 "Nonetheless, the capture is started.\n",
2325 interface_opts.buffer_size);
2326 report_capture_error("Couldn't set the capture buffer size!",
2327 sync_secondary_msg_str);
2328 g_free(sync_secondary_msg_str);
2332 #if defined(HAVE_PCAP_SETSAMPLING)
2333 if (interface_opts.sampling_method != CAPTURE_SAMP_NONE) {
2334 struct pcap_samp *samp;
2336 if ((samp = pcap_setsampling(pcap_opts->pcap_h)) != NULL) {
2337 switch (interface_opts.sampling_method) {
2338 case CAPTURE_SAMP_BY_COUNT:
2339 samp->method = PCAP_SAMP_1_EVERY_N;
2342 case CAPTURE_SAMP_BY_TIMER:
2343 samp->method = PCAP_SAMP_FIRST_AFTER_N_MS;
2347 sync_msg_str = g_strdup_printf(
2348 "Unknown sampling method %d specified,\n"
2349 "continue without packet sampling",
2350 interface_opts.sampling_method);
2351 report_capture_error("Couldn't set the capture "
2352 "sampling", sync_msg_str);
2353 g_free(sync_msg_str);
2355 samp->value = interface_opts.sampling_param;
2357 report_capture_error("Couldn't set the capture sampling",
2358 "Cannot get packet sampling data structure");
2363 /* setting the data link type only works on real interfaces */
2364 if (!set_pcap_linktype(pcap_opts->pcap_h, interface_opts.linktype, interface_opts.name,
2366 secondary_errmsg, secondary_errmsg_len)) {
2369 pcap_opts->linktype = get_pcap_linktype(pcap_opts->pcap_h, interface_opts.name);
2371 /* We couldn't open "iface" as a network device. */
2372 /* Try to open it as a pipe */
2373 cap_pipe_open_live(interface_opts.name, pcap_opts, &pcap_opts->cap_pipe_hdr, errmsg, (int) errmsg_len);
2376 if (pcap_opts->cap_pipe_fd == -1) {
2378 if (pcap_opts->cap_pipe_h == INVALID_HANDLE_VALUE) {
2380 if (pcap_opts->cap_pipe_err == PIPNEXIST) {
2381 /* Pipe doesn't exist, so output message for interface */
2382 get_capture_device_open_failure_messages(open_err_str,
2383 interface_opts.name,
2387 secondary_errmsg_len);
2390 * Else pipe (or file) does exist and cap_pipe_open_live() has
2395 /* cap_pipe_open_live() succeeded; don't want
2396 error message from pcap_open_live() */
2397 open_err_str[0] = '\0';
2401 /* XXX - will this work for tshark? */
2402 #ifdef MUST_DO_SELECT
2403 if (!pcap_opts->from_cap_pipe) {
2404 #ifdef HAVE_PCAP_GET_SELECTABLE_FD
2405 pcap_opts->pcap_fd = pcap_get_selectable_fd(pcap_opts->pcap_h);
2407 pcap_opts->pcap_fd = pcap_fileno(pcap_opts->pcap_h);
2412 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
2413 returned a warning; print it, but keep capturing. */
2414 if (open_err_str[0] != '\0') {
2415 sync_msg_str = g_strdup_printf("%s.", open_err_str);
2416 report_capture_error(sync_msg_str, "");
2417 g_free(sync_msg_str);
2419 capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, i);
2420 g_array_insert_val(capture_opts->ifaces, i, interface_opts);
2423 /* If not using libcap: we now can now set euid/egid to ruid/rgid */
2424 /* to remove any suid privileges. */
2425 /* If using libcap: we can now remove NET_RAW and NET_ADMIN capabilities */
2426 /* (euid/egid have already previously been set to ruid/rgid. */
2427 /* (See comment in main() for details) */
2429 relinquish_special_privs_perm();
2431 relinquish_all_capabilities();
2436 /* close the capture input file (pcap or capture pipe) */
2437 static void capture_loop_close_input(loop_data *ld)
2440 pcap_options *pcap_opts;
2442 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input");
2444 for (i = 0; i < ld->pcaps->len; i++) {
2445 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2446 /* if open, close the capture pipe "input file" */
2448 if (pcap_opts->cap_pipe_fd >= 0) {
2449 g_assert(pcap_opts->from_cap_pipe);
2450 ws_close(pcap_opts->cap_pipe_fd);
2451 pcap_opts->cap_pipe_fd = -1;
2454 if (pcap_opts->cap_pipe_h != INVALID_HANDLE_VALUE) {
2455 CloseHandle(pcap_opts->cap_pipe_h);
2456 pcap_opts->cap_pipe_h = INVALID_HANDLE_VALUE;
2459 /* if open, close the pcap "input file" */
2460 if (pcap_opts->pcap_h != NULL) {
2461 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_input: closing %p", (void *)pcap_opts->pcap_h);
2462 pcap_close(pcap_opts->pcap_h);
2463 pcap_opts->pcap_h = NULL;
2470 /* Shut down windows sockets */
2476 /* init the capture filter */
2477 static initfilter_status_t
2478 capture_loop_init_filter(pcap_t *pcap_h, gboolean from_cap_pipe,
2479 const gchar * name, const gchar * cfilter)
2481 struct bpf_program fcode;
2483 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_filter: %s", cfilter);
2485 /* capture filters only work on real interfaces */
2486 if (cfilter && !from_cap_pipe) {
2487 /* A capture filter was specified; set it up. */
2488 if (!compile_capture_filter(name, pcap_h, &fcode, cfilter)) {
2489 /* Treat this specially - our caller might try to compile this
2490 as a display filter and, if that succeeds, warn the user that
2491 the display and capture filter syntaxes are different. */
2492 return INITFILTER_BAD_FILTER;
2494 if (pcap_setfilter(pcap_h, &fcode) < 0) {
2495 #ifdef HAVE_PCAP_FREECODE
2496 pcap_freecode(&fcode);
2498 return INITFILTER_OTHER_ERROR;
2500 #ifdef HAVE_PCAP_FREECODE
2501 pcap_freecode(&fcode);
2505 return INITFILTER_NO_ERROR;
2509 /* set up to write to the already-opened capture output file/files */
2511 capture_loop_init_output(capture_options *capture_opts, loop_data *ld, char *errmsg, int errmsg_len)
2515 pcap_options *pcap_opts;
2516 interface_options interface_opts;
2517 gboolean successful;
2519 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_init_output");
2521 if ((capture_opts->use_pcapng == FALSE) &&
2522 (capture_opts->ifaces->len > 1)) {
2523 g_snprintf(errmsg, errmsg_len,
2524 "Using PCAPNG is required for capturing on mulitple interfaces! Use the -n option.");
2528 /* Set up to write to the capture file. */
2529 if (capture_opts->multi_files_on) {
2530 ld->pdh = ringbuf_init_libpcap_fdopen(&err);
2532 ld->pdh = libpcap_fdopen(ld->save_file_fd, &err);
2535 if (capture_opts->use_pcapng) {
2538 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2539 successful = libpcap_write_session_header_block(ld->pdh, appname, &ld->bytes_written, &err);
2540 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2541 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2542 pcap_opts = g_array_index(ld->pcaps, pcap_options *, i);
2543 if (pcap_opts->from_cap_pipe) {
2544 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2546 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2548 successful = libpcap_write_interface_description_block(ld->pdh,
2549 interface_opts.name,
2550 interface_opts.cfilter?interface_opts.cfilter:"",
2551 pcap_opts->linktype,
2557 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2558 pcap_opts = g_array_index(ld->pcaps, pcap_options *, 0);
2559 if (pcap_opts->from_cap_pipe) {
2560 pcap_opts->snaplen = pcap_opts->cap_pipe_hdr.snaplen;
2562 pcap_opts->snaplen = pcap_snapshot(pcap_opts->pcap_h);
2564 successful = libpcap_write_file_header(ld->pdh, pcap_opts->linktype, pcap_opts->snaplen,
2565 &ld->bytes_written, &err);
2573 if (ld->pdh == NULL) {
2574 /* We couldn't set up to write to the capture file. */
2575 /* XXX - use cf_open_error_message from tshark instead? */
2580 g_snprintf(errmsg, errmsg_len,
2581 "The file to which the capture would be"
2582 " saved (\"%s\") could not be opened: Error %d.",
2583 capture_opts->save_file, err);
2585 g_snprintf(errmsg, errmsg_len,
2586 "The file to which the capture would be"
2587 " saved (\"%s\") could not be opened: %s.",
2588 capture_opts->save_file, g_strerror(err));
2600 capture_loop_close_output(capture_options *capture_opts, loop_data *ld, int *err_close)
2604 pcap_options *pcap_opts;
2606 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_close_output");
2608 if (capture_opts->multi_files_on) {
2609 return ringbuf_libpcap_dump_close(&capture_opts->save_file, err_close);
2611 if (capture_opts->use_pcapng) {
2612 for (i = 0; i < global_ld.pcaps->len; i++) {
2613 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2614 if (!pcap_opts->from_cap_pipe) {
2615 libpcap_write_interface_statistics_block(ld->pdh, i, pcap_opts->pcap_h, &ld->bytes_written, err_close);
2619 return libpcap_dump_close(ld->pdh, err_close);
2623 /* dispatch incoming packets (pcap or capture pipe)
2625 * Waits for incoming packets to be available, and calls pcap_dispatch()
2626 * to cause them to be processed.
2628 * Returns the number of packets which were processed.
2630 * Times out (returning zero) after CAP_READ_TIMEOUT ms; this ensures that the
2631 * packet-batching behaviour does not cause packets to get held back
2635 capture_loop_dispatch(loop_data *ld,
2636 char *errmsg, int errmsg_len, pcap_options *pcap_opts)
2639 gint packet_count_before;
2640 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
2641 #if !(defined(USE_THREADS) && defined(_WIN32))
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");
2651 #if !(defined(USE_THREADS) && defined(_WIN32))
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);
2669 #if !(defined(USE_THREADS) && defined(_WIN32))
2675 /* dispatch from pcap */
2676 #ifdef MUST_DO_SELECT
2678 * If we have "pcap_get_selectable_fd()", we use it to get the
2679 * descriptor on which to select; if that's -1, it means there
2680 * is no descriptor on which you can do a "select()" (perhaps
2681 * because you're capturing on a special device, and that device's
2682 * driver unfortunately doesn't support "select()", in which case
2683 * we don't do the select - which means it might not be possible
2684 * to stop a capture until a packet arrives. If that's unacceptable,
2685 * plead with whoever supplies the software for that device to add
2686 * "select()" support, or upgrade to libpcap 0.8.1 or later, and
2687 * rebuild Wireshark or get a version built with libpcap 0.8.1 or
2688 * later, so it can use pcap_breakloop().
2690 #ifdef LOG_CAPTURE_VERBOSE
2691 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch with select");
2693 if (pcap_opts->pcap_fd != -1) {
2694 sel_ret = cap_pipe_select(pcap_opts->pcap_fd);
2697 * "select()" says we can read from it without blocking; go for
2700 * We don't have pcap_breakloop(), so we only process one packet
2701 * per pcap_dispatch() call, to allow a signal to stop the
2702 * processing immediately, rather than processing all packets
2703 * in a batch before quitting.
2706 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2708 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2712 /* Error, rather than pcap_breakloop(). */
2713 pcap_opts->pcap_err = TRUE;
2715 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2718 if (sel_ret < 0 && errno != EINTR) {
2719 g_snprintf(errmsg, errmsg_len,
2720 "Unexpected error from select: %s", g_strerror(errno));
2721 report_capture_error(errmsg, please_report);
2727 #endif /* MUST_DO_SELECT */
2729 /* dispatch from pcap without select */
2731 #ifdef LOG_CAPTURE_VERBOSE
2732 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_dispatch");
2736 * On Windows, we don't support asynchronously telling a process to
2737 * stop capturing; instead, we check for an indication on a pipe
2738 * after processing packets. We therefore process only one packet
2739 * at a time, so that we can check the pipe after every packet.
2742 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2744 inpkts = pcap_dispatch(pcap_opts->pcap_h, 1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2748 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_queue_packet_cb, (u_char *)pcap_opts);
2750 inpkts = pcap_dispatch(pcap_opts->pcap_h, -1, capture_loop_write_packet_cb, (u_char *)pcap_opts);
2755 /* Error, rather than pcap_breakloop(). */
2756 pcap_opts->pcap_err = TRUE;
2758 ld->go = FALSE; /* error or pcap_breakloop() - stop capturing */
2760 #else /* pcap_next_ex */
2761 #ifdef LOG_CAPTURE_VERBOSE
2762 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: from pcap_next_ex");
2764 /* XXX - this is currently unused, as there is some confusion with pcap_next_ex() vs. pcap_dispatch() */
2767 * WinPcap's remote capturing feature doesn't work with pcap_dispatch(),
2768 * see http://wiki.wireshark.org/CaptureSetup_2fWinPcapRemote
2769 * This should be fixed in the WinPcap 4.0 alpha release.
2771 * For reference, an example remote interface:
2772 * rpcap://[1.2.3.4]/\Device\NPF_{39993D68-7C9B-4439-A329-F2D888DA7C5C}
2775 /* emulate dispatch from pcap */
2778 struct pcap_pkthdr *pkt_header;
2783 (in = pcap_next_ex(pcap_opts->pcap_h, &pkt_header, &pkt_data)) == 1) {
2785 capture_loop_queue_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2787 capture_loop_write_packet_cb((u_char *)pcap_opts, pkt_header, pkt_data);
2792 pcap_opts->pcap_err = TRUE;
2796 #endif /* pcap_next_ex */
2800 #ifdef LOG_CAPTURE_VERBOSE
2801 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_dispatch: %d new packet%s", inpkts, plurality(inpkts, "", "s"));
2804 return ld->packet_count - packet_count_before;
2808 /* Isolate the Universally Unique Identifier from the interface. Basically, we
2809 * want to grab only the characters between the '{' and '}' delimiters.
2811 * Returns a GString that must be freed with g_string_free(). */
2813 isolate_uuid(const char *iface)
2818 ptr = strchr(iface, '{');
2820 return g_string_new(iface);
2821 gstr = g_string_new(ptr + 1);
2823 ptr = strchr(gstr->str, '}');
2827 gstr = g_string_truncate(gstr, ptr - gstr->str);
2832 /* open the output file (temporary/specified name/ringbuffer/named pipe/stdout) */
2833 /* Returns TRUE if the file opened successfully, FALSE otherwise. */
2835 capture_loop_open_output(capture_options *capture_opts, int *save_file_fd,
2836 char *errmsg, int errmsg_len)
2839 gchar *capfile_name;
2841 gboolean is_tempfile;
2843 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "capture_loop_open_output: %s",
2844 (capture_opts->save_file) ? capture_opts->save_file : "(not specified)");
2846 if (capture_opts->save_file != NULL) {
2847 /* We return to the caller while the capture is in progress.
2848 * Therefore we need to take a copy of save_file in
2849 * case the caller destroys it after we return.
2851 capfile_name = g_strdup(capture_opts->save_file);
2853 if (capture_opts->output_to_pipe == TRUE) { /* either "-" or named pipe */
2854 if (capture_opts->multi_files_on) {
2855 /* ringbuffer is enabled; that doesn't work with standard output or a named pipe */
2856 g_snprintf(errmsg, errmsg_len,
2857 "Ring buffer requested, but capture is being written to standard output or to a named pipe.");
2858 g_free(capfile_name);
2861 if (strcmp(capfile_name, "-") == 0) {
2862 /* write to stdout */
2865 /* set output pipe to binary mode to avoid Windows text-mode processing (eg: for CR/LF) */
2866 _setmode(1, O_BINARY);
2869 } /* if (...output_to_pipe ... */
2872 if (capture_opts->multi_files_on) {
2873 /* ringbuffer is enabled */
2874 *save_file_fd = ringbuf_init(capfile_name,
2875 (capture_opts->has_ring_num_files) ? capture_opts->ring_num_files : 0,
2876 capture_opts->group_read_access);
2878 /* we need the ringbuf name */
2879 if(*save_file_fd != -1) {
2880 g_free(capfile_name);
2881 capfile_name = g_strdup(ringbuf_current_filename());
2884 /* Try to open/create the specified file for use as a capture buffer. */
2885 *save_file_fd = ws_open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
2886 (capture_opts->group_read_access) ? 0640 : 0600);
2889 is_tempfile = FALSE;
2891 /* Choose a random name for the temporary capture buffer */
2892 if (global_capture_opts.ifaces->len > 1) {
2893 prefix = g_strdup_printf("wireshark_%d_interfaces", global_capture_opts.ifaces->len);
2898 iface = isolate_uuid(g_array_index(global_capture_opts.ifaces, interface_options, 0).name);
2899 prefix = g_strconcat("wireshark_", g_basename(iface->str), NULL);
2900 g_string_free(iface, TRUE);
2902 prefix = g_strconcat("wireshark_", g_basename(g_array_index(global_capture_opts.ifaces, interface_options, 0).name), NULL);
2905 *save_file_fd = create_tempfile(&tmpname, prefix);
2907 capfile_name = g_strdup(tmpname);
2911 /* did we fail to open the output file? */
2912 if (*save_file_fd == -1) {
2914 g_snprintf(errmsg, errmsg_len,
2915 "The temporary file to which the capture would be saved (\"%s\") "
2916 "could not be opened: %s.", capfile_name, g_strerror(errno));
2918 if (capture_opts->multi_files_on) {
2919 ringbuf_error_cleanup();
2922 g_snprintf(errmsg, errmsg_len,
2923 "The file to which the capture would be saved (\"%s\") "
2924 "could not be opened: %s.", capfile_name,
2927 g_free(capfile_name);
2931 if(capture_opts->save_file != NULL) {
2932 g_free(capture_opts->save_file);
2934 capture_opts->save_file = capfile_name;
2935 /* capture_opts.save_file is "g_free"ed later, which is equivalent to
2936 "g_free(capfile_name)". */
2942 /* Do the work of handling either the file size or file duration capture
2943 conditions being reached, and switching files or stopping. */
2945 do_file_switch_or_stop(capture_options *capture_opts,
2946 condition *cnd_autostop_files,
2947 condition *cnd_autostop_size,
2948 condition *cnd_file_duration)
2951 pcap_options *pcap_opts;
2952 interface_options interface_opts;
2953 gboolean successful;
2955 if (capture_opts->multi_files_on) {
2956 if (cnd_autostop_files != NULL &&
2957 cnd_eval(cnd_autostop_files, ++global_ld.autostop_files)) {
2958 /* no files left: stop here */
2959 global_ld.go = FALSE;
2963 /* Switch to the next ringbuffer file */
2964 if (ringbuf_switch_file(&global_ld.pdh, &capture_opts->save_file,
2965 &global_ld.save_file_fd, &global_ld.err)) {
2967 /* File switch succeeded: reset the conditions */
2968 global_ld.bytes_written = 0;
2969 if (capture_opts->use_pcapng) {
2972 g_snprintf(appname, sizeof(appname), "Dumpcap " VERSION "%s", wireshark_svnversion);
2973 successful = libpcap_write_session_header_block(global_ld.pdh, appname, &(global_ld.bytes_written), &global_ld.err);
2974 for (i = 0; successful && (i < capture_opts->ifaces->len); i++) {
2975 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
2976 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
2977 successful = libpcap_write_interface_description_block(global_ld.pdh,
2978 interface_opts.name,
2979 interface_opts.cfilter?interface_opts.cfilter:"",
2980 pcap_opts->linktype,
2982 &(global_ld.bytes_written),
2986 interface_opts = g_array_index(capture_opts->ifaces, interface_options, 0);
2987 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
2988 successful = libpcap_write_file_header(global_ld.pdh, pcap_opts->linktype, pcap_opts->snaplen,
2989 &global_ld.bytes_written, &global_ld.err);
2992 fclose(global_ld.pdh);
2993 global_ld.pdh = NULL;
2994 global_ld.go = FALSE;
2997 if (cnd_autostop_size)
2998 cnd_reset(cnd_autostop_size);
2999 if (cnd_file_duration)
3000 cnd_reset(cnd_file_duration);
3001 libpcap_dump_flush(global_ld.pdh, NULL);
3003 report_packet_count(global_ld.inpkts_to_sync_pipe);
3004 global_ld.inpkts_to_sync_pipe = 0;
3005 report_new_capture_file(capture_opts->save_file);
3007 /* File switch failed: stop here */
3008 global_ld.go = FALSE;
3012 /* single file, stop now */
3013 global_ld.go = FALSE;
3020 pcap_read_handler(void* arg)
3022 pcap_options *pcap_opts;
3023 char errmsg[MSG_MAX_LENGTH+1];
3025 pcap_opts = (pcap_options *)arg;
3027 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Started thread for interface %d.",
3028 pcap_opts->interface_id);
3030 while (global_ld.go) {
3031 /* dispatch incoming packets */
3032 capture_loop_dispatch(&global_ld, errmsg, sizeof(errmsg), pcap_opts);
3034 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Stopped thread for interface %d.",
3035 pcap_opts->interface_id);
3036 g_thread_exit(NULL);
3040 /* Do the low-level work of a capture.
3041 Returns TRUE if it succeeds, FALSE otherwise. */
3043 capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats)
3046 time_t upd_time, cur_time;
3048 struct timeval upd_time, cur_time;
3052 condition *cnd_file_duration = NULL;
3053 condition *cnd_autostop_files = NULL;
3054 condition *cnd_autostop_size = NULL;
3055 condition *cnd_autostop_duration = NULL;
3058 gboolean cfilter_error = FALSE;
3059 char errmsg[MSG_MAX_LENGTH+1];
3060 char secondary_errmsg[MSG_MAX_LENGTH+1];
3061 pcap_options *pcap_opts;
3062 interface_options interface_opts;
3063 guint i, error_index = 0;
3065 interface_opts = capture_opts->default_options;
3067 *secondary_errmsg = '\0';
3069 /* init the loop data */
3070 global_ld.go = TRUE;
3071 global_ld.packet_count = 0;
3073 global_ld.report_packet_count = FALSE;
3075 if (capture_opts->has_autostop_packets)
3076 global_ld.packet_max = capture_opts->autostop_packets;
3078 global_ld.packet_max = 0; /* no limit */
3079 global_ld.inpkts_to_sync_pipe = 0;
3080 global_ld.err = 0; /* no error seen yet */
3081 global_ld.pdh = NULL;
3082 global_ld.autostop_files = 0;
3083 global_ld.save_file_fd = -1;
3085 /* We haven't yet gotten the capture statistics. */
3086 *stats_known = FALSE;
3088 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop starting ...");
3089 capture_opts_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, capture_opts);
3091 /* open the "input file" from network interface or capture pipe */
3092 if (!capture_loop_open_input(capture_opts, &global_ld, errmsg, sizeof(errmsg),
3093 secondary_errmsg, sizeof(secondary_errmsg))) {
3096 for (i = 0; i < capture_opts->ifaces->len; i++) {
3097 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3098 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3099 /* init the input filter from the network interface (capture pipe will do nothing) */
3101 * When remote capturing WinPCap crashes when the capture filter
3102 * is NULL. This might be a bug in WPCap. Therefore we provide an emtpy
3105 switch (capture_loop_init_filter(pcap_opts->pcap_h, pcap_opts->from_cap_pipe,
3106 interface_opts.name,
3107 interface_opts.cfilter?interface_opts.cfilter:"")) {
3109 case INITFILTER_NO_ERROR:
3112 case INITFILTER_BAD_FILTER:
3113 cfilter_error = TRUE;
3115 g_snprintf(errmsg, sizeof(errmsg), "%s", pcap_geterr(pcap_opts->pcap_h));
3118 case INITFILTER_OTHER_ERROR:
3119 g_snprintf(errmsg, sizeof(errmsg), "Can't install filter (%s).",
3120 pcap_geterr(pcap_opts->pcap_h));
3121 g_snprintf(secondary_errmsg, sizeof(secondary_errmsg), "%s", please_report);
3126 /* If we're supposed to write to a capture file, open it for output
3127 (temporary/specified name/ringbuffer) */
3128 if (capture_opts->saving_to_file) {
3129 if (!capture_loop_open_output(capture_opts, &global_ld.save_file_fd,
3130 errmsg, sizeof(errmsg))) {
3134 /* set up to write to the already-opened capture output file/files */
3135 if (!capture_loop_init_output(capture_opts, &global_ld, errmsg,
3140 /* XXX - capture SIGTERM and close the capture, in case we're on a
3141 Linux 2.0[.x] system and you have to explicitly close the capture
3142 stream in order to turn promiscuous mode off? We need to do that
3143 in other places as well - and I don't think that works all the
3144 time in any case, due to libpcap bugs. */
3146 /* Well, we should be able to start capturing.
3148 Sync out the capture file, so the header makes it to the file system,
3149 and send a "capture started successfully and capture file created"
3150 message to our parent so that they'll open the capture file and
3151 update its windows to indicate that we have a live capture in
3153 libpcap_dump_flush(global_ld.pdh, NULL);
3154 report_new_capture_file(capture_opts->save_file);
3157 /* initialize capture stop (and alike) conditions */
3158 init_capture_stop_conditions();
3159 /* create stop conditions */
3160 if (capture_opts->has_autostop_filesize)
3162 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts->autostop_filesize * 1024);
3163 if (capture_opts->has_autostop_duration)
3164 cnd_autostop_duration =
3165 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts->autostop_duration);
3167 if (capture_opts->multi_files_on) {
3168 if (capture_opts->has_file_duration)
3170 cnd_new(CND_CLASS_TIMEOUT, capture_opts->file_duration);
3172 if (capture_opts->has_autostop_files)
3173 cnd_autostop_files =
3174 cnd_new(CND_CLASS_CAPTURESIZE, capture_opts->autostop_files);
3177 /* init the time values */
3179 upd_time = GetTickCount();
3181 gettimeofday(&upd_time, NULL);
3184 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop running!");
3186 /* WOW, everything is prepared! */
3187 /* please fasten your seat belts, we will enter now the actual capture loop */
3189 pcap_queue = g_async_queue_new();
3190 pcap_queue_bytes = 0;
3191 pcap_queue_packets = 0;
3192 for (i = 0; i < global_ld.pcaps->len; i++) {
3193 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3194 pcap_opts->tid = g_thread_create(pcap_read_handler, pcap_opts, TRUE, NULL);
3197 while (global_ld.go) {
3198 /* dispatch incoming packets */
3200 GTimeVal write_thread_time;
3201 pcap_queue_element *queue_element;
3203 g_get_current_time(&write_thread_time);
3204 g_time_val_add(&write_thread_time, WRITER_THREAD_TIMEOUT);
3205 g_async_queue_lock(pcap_queue);
3206 queue_element = g_async_queue_timed_pop_unlocked(pcap_queue, &write_thread_time);
3207 if (queue_element) {
3208 pcap_queue_bytes -= queue_element->phdr.caplen;
3209 pcap_queue_packets -= 1;
3211 g_async_queue_unlock(pcap_queue);
3212 if (queue_element) {
3213 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3214 "Dequeued a packet of length %d captured on interface %d.",
3215 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3217 capture_loop_write_packet_cb((u_char *) queue_element->pcap_opts,
3218 &queue_element->phdr,
3220 g_free(queue_element->pd);
3221 g_free(queue_element);
3227 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, 0);
3228 inpkts = capture_loop_dispatch(&global_ld, errmsg,
3229 sizeof(errmsg), pcap_opts);
3232 /* Were we asked to print packet counts by the SIGINFO handler? */
3233 if (global_ld.report_packet_count) {
3234 fprintf(stderr, "%u packet%s captured\n", global_ld.packet_count,
3235 plurality(global_ld.packet_count, "", "s"));
3236 global_ld.report_packet_count = FALSE;
3241 /* any news from our parent (signal pipe)? -> just stop the capture */
3242 if (!signal_pipe_check_running()) {
3243 global_ld.go = FALSE;
3248 global_ld.inpkts_to_sync_pipe += inpkts;
3250 /* check capture size condition */
3251 if (cnd_autostop_size != NULL &&
3252 cnd_eval(cnd_autostop_size, (guint32)global_ld.bytes_written)) {
3253 /* Capture size limit reached, do we have another file? */
3254 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3255 cnd_autostop_size, cnd_file_duration))
3257 } /* cnd_autostop_size */
3258 if (capture_opts->output_to_pipe) {
3259 libpcap_dump_flush(global_ld.pdh, NULL);
3263 /* Only update once every 500ms so as not to overload slow displays.
3264 * This also prevents too much context-switching between the dumpcap
3265 * and wireshark processes.
3267 #define DUMPCAP_UPD_TIME 500
3270 cur_time = GetTickCount();
3271 if ( (cur_time - upd_time) > DUMPCAP_UPD_TIME) {
3273 gettimeofday(&cur_time, NULL);
3274 if ((cur_time.tv_sec * 1000000 + cur_time.tv_usec) >
3275 (upd_time.tv_sec * 1000000 + upd_time.tv_usec + DUMPCAP_UPD_TIME*1000)) {
3278 upd_time = cur_time;
3281 if (pcap_stats(pch, stats) >= 0) {
3282 *stats_known = TRUE;
3285 /* Let the parent process know. */
3286 if (global_ld.inpkts_to_sync_pipe) {
3288 libpcap_dump_flush(global_ld.pdh, NULL);
3290 /* Send our parent a message saying we've written out
3291 "global_ld.inpkts_to_sync_pipe" packets to the capture file. */
3293 report_packet_count(global_ld.inpkts_to_sync_pipe);
3295 global_ld.inpkts_to_sync_pipe = 0;
3298 /* check capture duration condition */
3299 if (cnd_autostop_duration != NULL && cnd_eval(cnd_autostop_duration)) {
3300 /* The maximum capture time has elapsed; stop the capture. */
3301 global_ld.go = FALSE;
3305 /* check capture file duration condition */
3306 if (cnd_file_duration != NULL && cnd_eval(cnd_file_duration)) {
3307 /* duration limit reached, do we have another file? */
3308 if (!do_file_switch_or_stop(capture_opts, cnd_autostop_files,
3309 cnd_autostop_size, cnd_file_duration))
3311 } /* cnd_file_duration */
3315 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopping ...");
3317 pcap_queue_element *queue_element;
3319 for (i = 0; i < global_ld.pcaps->len; i++) {
3320 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3321 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Waiting for thread of interface %u...",
3322 pcap_opts->interface_id);
3323 g_thread_join(pcap_opts->tid);
3324 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Thread of interface %u terminated.",
3325 pcap_opts->interface_id);
3328 g_async_queue_lock(pcap_queue);
3329 queue_element = g_async_queue_try_pop_unlocked(pcap_queue);
3330 if (queue_element) {
3331 pcap_queue_bytes -= queue_element->phdr.caplen;
3332 pcap_queue_packets -= 1;
3334 g_async_queue_unlock(pcap_queue);
3335 if (queue_element == NULL) {
3338 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3339 "Dequeued a packet of length %d captured on interface %d.",
3340 queue_element->phdr.caplen, queue_element->pcap_opts->interface_id);
3341 capture_loop_write_packet_cb((u_char *)queue_element->pcap_opts,
3342 &queue_element->phdr,
3344 g_free(queue_element->pd);
3345 g_free(queue_element);
3346 global_ld.inpkts_to_sync_pipe += 1;
3347 if (capture_opts->output_to_pipe) {
3348 libpcap_dump_flush(global_ld.pdh, NULL);
3354 /* delete stop conditions */
3355 if (cnd_file_duration != NULL)
3356 cnd_delete(cnd_file_duration);
3357 if (cnd_autostop_files != NULL)
3358 cnd_delete(cnd_autostop_files);
3359 if (cnd_autostop_size != NULL)
3360 cnd_delete(cnd_autostop_size);
3361 if (cnd_autostop_duration != NULL)
3362 cnd_delete(cnd_autostop_duration);
3364 /* did we have a pcap (input) error? */
3365 for (i = 0; i < capture_opts->ifaces->len; i++) {
3366 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3367 if (pcap_opts->pcap_err) {
3368 /* On Linux, if an interface goes down while you're capturing on it,
3369 you'll get a "recvfrom: Network is down" or
3370 "The interface went down" error (ENETDOWN).
3371 (At least you will if g_strerror() doesn't show a local translation
3374 On FreeBSD and OS X, if a network adapter disappears while
3375 you're capturing on it, you'll get a "read: Device not configured"
3376 error (ENXIO). (See previous parenthetical note.)
3378 On OpenBSD, you get "read: I/O error" (EIO) in the same case.
3380 These should *not* be reported to the Wireshark developers. */
3383 cap_err_str = pcap_geterr(pcap_opts->pcap_h);
3384 if (strcmp(cap_err_str, "recvfrom: Network is down") == 0 ||
3385 strcmp(cap_err_str, "The interface went down") == 0 ||
3386 strcmp(cap_err_str, "read: Device not configured") == 0 ||
3387 strcmp(cap_err_str, "read: I/O error") == 0 ||
3388 strcmp(cap_err_str, "read error: PacketReceivePacket failed") == 0) {
3389 report_capture_error("The network adapter on which the capture was being done "
3390 "is no longer running; the capture has stopped.",
3393 g_snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
3395 report_capture_error(errmsg, please_report);
3398 } else if (pcap_opts->from_cap_pipe && pcap_opts->cap_pipe_err == PIPERR) {
3399 report_capture_error(errmsg, "");
3403 /* did we have an output error while capturing? */
3404 if (global_ld.err == 0) {
3407 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file,
3408 global_ld.err, FALSE);
3409 report_capture_error(errmsg, please_report);
3413 if (capture_opts->saving_to_file) {
3414 /* close the output file */
3415 close_ok = capture_loop_close_output(capture_opts, &global_ld, &err_close);
3419 /* there might be packets not yet notified to the parent */
3420 /* (do this after closing the file, so all packets are already flushed) */
3421 if(global_ld.inpkts_to_sync_pipe) {
3423 report_packet_count(global_ld.inpkts_to_sync_pipe);
3424 global_ld.inpkts_to_sync_pipe = 0;
3427 /* If we've displayed a message about a write error, there's no point
3428 in displaying another message about an error on close. */
3429 if (!close_ok && write_ok) {
3430 capture_loop_get_errmsg(errmsg, sizeof(errmsg), capture_opts->save_file, err_close,
3432 report_capture_error(errmsg, "");
3436 * XXX We exhibit different behaviour between normal mode and sync mode
3437 * when the pipe is stdin and not already at EOF. If we're a child, the
3438 * parent's stdin isn't closed, so if the user starts another capture,
3439 * cap_pipe_open_live() will very likely not see the expected magic bytes and
3440 * will say "Unrecognized libpcap format". On the other hand, in normal
3441 * mode, cap_pipe_open_live() will say "End of file on pipe during open".
3444 report_capture_count(TRUE);
3446 /* get packet drop statistics from pcap */
3447 for (i = 0; i < capture_opts->ifaces->len; i++) {
3451 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3452 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
3453 received = pcap_opts->received;
3454 dropped = pcap_opts->dropped;
3455 if (pcap_opts->pcap_h != NULL) {
3456 g_assert(!pcap_opts->from_cap_pipe);
3457 /* Get the capture statistics, so we know how many packets were dropped. */
3458 if (pcap_stats(pcap_opts->pcap_h, stats) >= 0) {
3459 *stats_known = TRUE;
3460 /* Let the parent process know. */
3461 dropped += stats->ps_drop;
3463 g_snprintf(errmsg, sizeof(errmsg),
3464 "Can't get packet-drop statistics: %s",
3465 pcap_geterr(pcap_opts->pcap_h));
3466 report_capture_error(errmsg, please_report);
3469 report_packet_drops(received, dropped, interface_opts.name);
3472 /* close the input file (pcap or capture pipe) */
3473 capture_loop_close_input(&global_ld);
3475 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped!");
3477 /* ok, if the write and the close were successful. */
3478 return write_ok && close_ok;
3481 if (capture_opts->multi_files_on) {
3482 /* cleanup ringbuffer */
3483 ringbuf_error_cleanup();
3485 /* We can't use the save file, and we have no FILE * for the stream
3486 to close in order to close it, so close the FD directly. */
3487 if (global_ld.save_file_fd != -1) {
3488 ws_close(global_ld.save_file_fd);
3491 /* We couldn't even start the capture, so get rid of the capture
3493 if (capture_opts->save_file != NULL) {
3494 ws_unlink(capture_opts->save_file);
3495 g_free(capture_opts->save_file);
3498 capture_opts->save_file = NULL;
3500 report_cfilter_error(capture_opts, error_index, errmsg);
3502 report_capture_error(errmsg, secondary_errmsg);
3504 /* close the input file (pcap or cap_pipe) */
3505 capture_loop_close_input(&global_ld);
3507 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Capture loop stopped with error");
3513 static void capture_loop_stop(void)
3515 #ifdef HAVE_PCAP_BREAKLOOP
3517 pcap_options *pcap_opts;
3519 for (i = 0; i < global_ld.pcaps->len; i++) {
3520 pcap_opts = g_array_index(global_ld.pcaps, pcap_options *, i);
3521 if (pcap_opts->pcap_h != NULL)
3522 pcap_breakloop(pcap_opts->pcap_h);
3525 global_ld.go = FALSE;
3530 capture_loop_get_errmsg(char *errmsg, int errmsglen, const char *fname,
3531 int err, gboolean is_close)
3536 g_snprintf(errmsg, errmsglen,
3537 "Not all the packets could be written to the file"
3538 " to which the capture was being saved\n"
3539 "(\"%s\") because there is no space left on the file system\n"
3540 "on which that file resides.",
3546 g_snprintf(errmsg, errmsglen,
3547 "Not all the packets could be written to the file"
3548 " to which the capture was being saved\n"
3549 "(\"%s\") because you are too close to, or over,"
3550 " your disk quota\n"
3551 "on the file system on which that file resides.",
3558 g_snprintf(errmsg, errmsglen,
3559 "The file to which the capture was being saved\n"
3560 "(\"%s\") could not be closed: %s.",
3561 fname, g_strerror(err));
3563 g_snprintf(errmsg, errmsglen,
3564 "An error occurred while writing to the file"
3565 " to which the capture was being saved\n"
3567 fname, g_strerror(err));
3574 /* one packet was captured, process it */
3576 capture_loop_write_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3579 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3582 /* We may be called multiple times from pcap_dispatch(); if we've set
3583 the "stop capturing" flag, ignore this packet, as we're not
3584 supposed to be saving any more packets. */
3588 if (global_ld.pdh) {
3589 gboolean successful;
3591 /* We're supposed to write the packet to a file; do so.
3592 If this fails, set "ld->go" to FALSE, to stop the capture, and set
3593 "ld->err" to the error. */
3594 if (global_capture_opts.use_pcapng) {
3595 successful = libpcap_write_enhanced_packet_block(global_ld.pdh, phdr, pcap_opts->interface_id, pd, &global_ld.bytes_written, &err);
3597 successful = libpcap_write_packet(global_ld.pdh, phdr, pd, &global_ld.bytes_written, &err);
3600 global_ld.go = FALSE;
3601 global_ld.err = err;
3603 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3604 "Wrote a packet of length %d captured on interface %u.",
3605 phdr->caplen, pcap_opts->interface_id);
3606 global_ld.packet_count++;
3607 pcap_opts->received++;
3608 /* if the user told us to stop after x packets, do we already have enough? */
3609 if ((global_ld.packet_max > 0) && (global_ld.packet_count >= global_ld.packet_max)) {
3610 global_ld.go = FALSE;
3616 /* one packet was captured, queue it */
3618 capture_loop_queue_packet_cb(u_char *pcap_opts_p, const struct pcap_pkthdr *phdr,
3621 pcap_options *pcap_opts = (pcap_options *) (void *) pcap_opts_p;
3622 pcap_queue_element *queue_element;
3623 gboolean limit_reached;
3625 /* We may be called multiple times from pcap_dispatch(); if we've set
3626 the "stop capturing" flag, ignore this packet, as we're not
3627 supposed to be saving any more packets. */
3631 queue_element = (pcap_queue_element *)g_malloc(sizeof(pcap_queue_element));
3632 if (queue_element == NULL) {
3633 pcap_opts->dropped++;
3636 queue_element->pcap_opts = pcap_opts;
3637 queue_element->phdr = *phdr;
3638 queue_element->pd = (u_char *)g_malloc(phdr->caplen);
3639 if (queue_element->pd == NULL) {
3640 pcap_opts->dropped++;
3641 g_free(queue_element);
3644 memcpy(queue_element->pd, pd, phdr->caplen);
3645 g_async_queue_lock(pcap_queue);
3646 if (((pcap_queue_byte_limit > 0) && (pcap_queue_bytes < pcap_queue_byte_limit)) &&
3647 ((pcap_queue_packet_limit > 0) && (pcap_queue_packets < pcap_queue_packet_limit))) {
3648 limit_reached = FALSE;
3649 g_async_queue_push_unlocked(pcap_queue, queue_element);
3650 pcap_queue_bytes += phdr->caplen;
3651 pcap_queue_packets += 1;
3653 limit_reached = TRUE;
3655 g_async_queue_unlock(pcap_queue);
3656 if (limit_reached) {
3657 pcap_opts->dropped++;
3658 g_free(queue_element->pd);
3659 g_free(queue_element);
3660 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3661 "Dropped a packet of length %d captured on interface %u.",
3662 phdr->caplen, pcap_opts->interface_id);
3664 pcap_opts->received++;
3665 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3666 "Queued a packet of length %d captured on interface %u.",
3667 phdr->caplen, pcap_opts->interface_id);
3669 /* I don't want to hold the mutex over the debug output. So the
3670 output may be wrong */
3671 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
3672 "Queue size is now %" G_GINT64_MODIFIER "d bytes (%" G_GINT64_MODIFIER "d packets)",
3673 pcap_queue_bytes, pcap_queue_packets);
3676 /* And now our feature presentation... [ fade to music ] */
3678 main(int argc, char *argv[])
3681 gboolean arg_error = FALSE;
3686 struct sigaction action, oldaction;
3689 gboolean start_capture = TRUE;
3690 gboolean stats_known;
3691 struct pcap_stat stats;
3692 GLogLevelFlags log_flags;
3693 gboolean list_interfaces = FALSE;
3694 gboolean list_link_layer_types = FALSE;
3695 #ifdef HAVE_BPF_IMAGE
3696 gboolean print_bpf_code = FALSE;
3698 gboolean machine_readable = FALSE;
3699 gboolean print_statistics = FALSE;
3700 int status, run_once_args = 0;
3703 #if defined(__APPLE__) && defined(__LP64__)
3704 struct utsname osinfo;
3708 arg_list_utf_16to8(argc, argv);
3713 * Initialize our DLL search path. MUST be called before LoadLibrary
3716 ws_init_dll_search_path();
3719 #ifdef HAVE_PCAP_REMOTE
3720 #define OPTSTRING_A "A:"
3721 #define OPTSTRING_r "r"
3722 #define OPTSTRING_u "u"
3724 #define OPTSTRING_A ""
3725 #define OPTSTRING_r ""
3726 #define OPTSTRING_u ""
3729 #ifdef HAVE_PCAP_SETSAMPLING
3730 #define OPTSTRING_m "m:"
3732 #define OPTSTRING_m ""
3735 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
3736 #define OPTSTRING_B "B:"
3738 #define OPTSTRING_B ""
3739 #endif /* _WIN32 or HAVE_PCAP_CREATE */
3741 #ifdef HAVE_PCAP_CREATE
3742 #define OPTSTRING_I "I"
3744 #define OPTSTRING_I ""
3747 #ifdef HAVE_BPF_IMAGE
3748 #define OPTSTRING_d "d"
3750 #define OPTSTRING_d ""
3754 #define OPTSTRING_t "t"
3756 #define OPTSTRING_t ""
3758 #define OPTSTRING "a:" OPTSTRING_A "b:" OPTSTRING_B "c:" OPTSTRING_d "Df:ghi:" OPTSTRING_I "L" OPTSTRING_m "MnpPq" OPTSTRING_r "Ss:" OPTSTRING_t OPTSTRING_u "vw:y:Z:"
3760 #ifdef DEBUG_CHILD_DUMPCAP
3761 if ((debug_log = ws_fopen("dumpcap_debug_log.tmp","w")) == NULL) {
3762 fprintf (stderr, "Unable to open debug log file !\n");
3767 #if defined(__APPLE__) && defined(__LP64__)
3769 * Is this Mac OS X 10.6.0, 10.6.1, 10.6.3, or 10.6.4? If so, we need
3770 * a bug workaround - timeouts less than 1 second don't work with libpcap
3771 * in 64-bit code. (The bug was introduced in 10.6, fixed in 10.6.2,
3772 * re-introduced in 10.6.3, not fixed in 10.6.4, and fixed in 10.6.5.
3773 * The problem is extremely unlikely to be reintroduced in a future
3776 if (uname(&osinfo) == 0) {
3778 * Mac OS X 10.x uses Darwin {x+4}.0.0. Mac OS X 10.x.y uses Darwin
3779 * {x+4}.y.0 (except that 10.6.1 appears to have a uname version
3780 * number of 10.0.0, not 10.1.0 - go figure).
3782 if (strcmp(osinfo.release, "10.0.0") == 0 || /* 10.6, 10.6.1 */
3783 strcmp(osinfo.release, "10.3.0") == 0 || /* 10.6.3 */
3784 strcmp(osinfo.release, "10.4.0") == 0) /* 10.6.4 */
3785 need_timeout_workaround = TRUE;
3790 * Determine if dumpcap is being requested to run in a special
3791 * capture_child mode by going thru the command line args to see if
3792 * a -Z is present. (-Z is a hidden option).
3794 * The primary result of running in capture_child mode is that
3795 * all messages sent out on stderr are in a special type/len/string
3796 * format to allow message processing by type. These messages include
3797 * error messages if dumpcap fails to start the operation it was
3798 * requested to do, as well as various "status" messages which are sent
3799 * when an actual capture is in progress, and a "success" message sent
3800 * if dumpcap was requested to perform an operation other than a
3803 * Capture_child mode would normally be requested by a parent process
3804 * which invokes dumpcap and obtains dumpcap stderr output via a pipe
3805 * to which dumpcap stderr has been redirected. It might also have
3806 * another pipe to obtain dumpcap stdout output; for operations other
3807 * than a capture, that information is formatted specially for easier
3808 * parsing by the parent process.
3810 * Capture_child mode needs to be determined immediately upon
3811 * startup so that any messages generated by dumpcap in this mode
3812 * (eg: during initialization) will be formatted properly.
3815 for (i=1; i<argc; i++) {
3816 if (strcmp("-Z", argv[i]) == 0) {
3817 capture_child = TRUE;
3818 machine_readable = TRUE; /* request machine-readable output */
3820 /* set output pipe to binary mode, to avoid ugly text conversions */
3821 _setmode(2, O_BINARY);
3826 /* The default_log_handler will use stdout, which makes trouble in */
3827 /* capture child mode, as it uses stdout for it's sync_pipe. */
3828 /* So: the filtering is done in the console_log_handler and not here.*/
3829 /* We set the log handlers right up front to make sure that any log */
3830 /* messages when running as child will be sent back to the parent */
3831 /* with the correct format. */
3835 G_LOG_LEVEL_CRITICAL|
3836 G_LOG_LEVEL_WARNING|
3837 G_LOG_LEVEL_MESSAGE|
3840 G_LOG_FLAG_FATAL|G_LOG_FLAG_RECURSION;
3842 g_log_set_handler(NULL,
3844 console_log_handler, NULL /* user_data */);
3845 g_log_set_handler(LOG_DOMAIN_MAIN,
3847 console_log_handler, NULL /* user_data */);
3848 g_log_set_handler(LOG_DOMAIN_CAPTURE,
3850 console_log_handler, NULL /* user_data */);
3851 g_log_set_handler(LOG_DOMAIN_CAPTURE_CHILD,
3853 console_log_handler, NULL /* user_data */);
3855 /* Initialize the pcaps list */
3856 global_ld.pcaps = g_array_new(FALSE, FALSE, sizeof(pcap_options *));
3858 /* Initialize the thread system */
3860 if (!g_thread_supported())
3861 g_thread_init(NULL);
3864 /* Load wpcap if possible. Do this before collecting the run-time version information */
3867 /* ... and also load the packet.dll from wpcap */
3868 /* XXX - currently not required, may change later. */
3869 /*wpcap_packet_load();*/
3871 /* Start windows sockets */
3872 WSAStartup( MAKEWORD( 1, 1 ), &wsaData );
3874 /* Set handler for Ctrl+C key */
3875 SetConsoleCtrlHandler(capture_cleanup_handler, TRUE);
3877 /* Catch SIGINT and SIGTERM and, if we get either of them, clean up
3879 action.sa_handler = capture_cleanup_handler;
3881 * Arrange that system calls not get restarted, because when
3882 * our signal handler returns we don't want to restart
3883 * a call that was waiting for packets to arrive.
3885 action.sa_flags = 0;
3886 sigemptyset(&action.sa_mask);
3887 sigaction(SIGTERM, &action, NULL);
3888 sigaction(SIGINT, &action, NULL);
3889 sigaction(SIGPIPE, &action, NULL);
3890 sigaction(SIGHUP, NULL, &oldaction);
3891 if (oldaction.sa_handler == SIG_DFL)
3892 sigaction(SIGHUP, &action, NULL);
3895 /* Catch SIGINFO and, if we get it and we're capturing in
3896 quiet mode, report the number of packets we've captured. */
3897 action.sa_handler = report_counts_siginfo;
3898 action.sa_flags = SA_RESTART;
3899 sigemptyset(&action.sa_mask);
3900 sigaction(SIGINFO, &action, NULL);
3901 #endif /* SIGINFO */
3904 /* ----------------------------------------------------------------- */
3905 /* Privilege and capability handling */
3907 /* 1. Running not as root or suid root; no special capabilities. */
3910 /* 2. Running logged in as root (euid=0; ruid=0); Not using libcap. */
3913 /* 3. Running logged in as root (euid=0; ruid=0). Using libcap. */
3915 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3916 /* capabilities; Drop all other capabilities; */
3917 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3918 /* else: after pcap_open_live() in capture_loop_open_input() */
3919 /* drop all capabilities (NET_RAW and NET_ADMIN); */
3920 /* (Note: this means that the process, although logged in */
3921 /* as root, does not have various permissions such as the */
3922 /* ability to bypass file access permissions). */
3923 /* XXX: Should we just leave capabilities alone in this case */
3924 /* so that user gets expected effect that root can do */
3927 /* 4. Running as suid root (euid=0, ruid=n); Not using libcap. */
3929 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3930 /* else: after pcap_open_live() in capture_loop_open_input() */
3931 /* drop suid root (set euid=ruid).(ie: keep suid until after */
3932 /* pcap_open_live). */
3934 /* 5. Running as suid root (euid=0, ruid=n); Using libcap. */
3936 /* - Near start of program: Enable NET_RAW and NET_ADMIN */
3937 /* capabilities; Drop all other capabilities; */
3938 /* Drop suid privileges (euid=ruid); */
3939 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3940 /* else: after pcap_open_live() in capture_loop_open_input() */
3941 /* drop all capabilities (NET_RAW and NET_ADMIN). */
3943 /* XXX: For some Linux versions/distros with capabilities */
3944 /* a 'normal' process with any capabilities cannot be */
3945 /* 'killed' (signaled) from another (same uid) non-privileged */
3947 /* For example: If (non-suid) Wireshark forks a */
3948 /* child suid dumpcap which acts as described here (case 5), */
3949 /* Wireshark will be unable to kill (signal) the child */
3950 /* dumpcap process until the capabilities have been dropped */
3951 /* (after pcap_open_live()). */
3952 /* This behaviour will apparently be changed in the kernel */
3953 /* to allow the kill (signal) in this case. */
3954 /* See the following for details: */
3955 /* http://www.mail-archive.com/ [wrapped] */
3956 /* linux-security-module@vger.kernel.org/msg02913.html */
3958 /* It is therefore conceivable that if dumpcap somehow hangs */
3959 /* in pcap_open_live or before that wireshark will not */
3960 /* be able to stop dumpcap using a signal (INT, TERM, etc). */
3961 /* In this case, exiting wireshark will kill the child */
3962 /* dumpcap process. */
3964 /* 6. Not root or suid root; Running with NET_RAW & NET_ADMIN */
3965 /* capabilities; Using libcap. Note: capset cmd (which see) */
3966 /* used to assign capabilities to file. */
3968 /* - If not -w (ie: doing -S or -D, etc) run to completion; */
3969 /* else: after pcap_open_live() in capture_loop_open_input() */
3970 /* drop all capabilities (NET_RAW and NET_ADMIN) */
3972 /* ToDo: -S (stats) should drop privileges/capabilities when no */
3973 /* longer required (similar to capture). */
3975 /* ----------------------------------------------------------------- */
3977 init_process_policies();
3980 /* If 'started with special privileges' (and using libcap) */
3981 /* Set to keep only NET_RAW and NET_ADMIN capabilities; */
3982 /* Set euid/egid = ruid/rgid to remove suid privileges */
3983 relinquish_privs_except_capture();
3986 /* Set the initial values in the capture options. This might be overwritten
3987 by the command line parameters. */
3988 capture_opts_init(&global_capture_opts, NULL);
3990 /* We always save to a file - if no file was specified, we save to a
3992 global_capture_opts.saving_to_file = TRUE;
3993 global_capture_opts.has_ring_num_files = TRUE;
3995 /* Now get our args */
3996 while ((opt = getopt(argc, argv, OPTSTRING)) != -1) {
3998 case 'h': /* Print help and exit */
4002 case 'v': /* Show version and exit */
4004 GString *comp_info_str;
4005 GString *runtime_info_str;
4006 /* Assemble the compile-time version information string */
4007 comp_info_str = g_string_new("Compiled ");
4008 get_compiled_version_info(comp_info_str, NULL, NULL);
4010 /* Assemble the run-time version information string */
4011 runtime_info_str = g_string_new("Running ");
4012 get_runtime_version_info(runtime_info_str, NULL);
4013 show_version(comp_info_str, runtime_info_str);
4014 g_string_free(comp_info_str, TRUE);
4015 g_string_free(runtime_info_str, TRUE);
4019 /*** capture option specific ***/
4020 case 'a': /* autostop criteria */
4021 case 'b': /* Ringbuffer option */
4022 case 'c': /* Capture x packets */
4023 case 'f': /* capture filter */
4024 case 'i': /* Use interface x */
4025 case 'n': /* Use pcapng format */
4026 case 'p': /* Don't capture in promiscuous mode */
4027 case 'P': /* Use pcap format */
4028 case 's': /* Set the snapshot (capture) length */
4029 case 'w': /* Write to capture file x */
4030 case 'g': /* enable group read accesson file(s) */
4031 case 'y': /* Set the pcap data link type */
4032 #ifdef HAVE_PCAP_REMOTE
4033 case 'u': /* Use UDP for data transfer */
4034 case 'r': /* Capture own RPCAP traffic too */
4035 case 'A': /* Authentication */
4037 #ifdef HAVE_PCAP_SETSAMPLING
4038 case 'm': /* Sampling */
4040 #if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
4041 case 'B': /* Buffer size */
4042 #endif /* _WIN32 or HAVE_PCAP_CREATE */
4043 #ifdef HAVE_PCAP_CREATE
4044 case 'I': /* Monitor mode */
4046 status = capture_opts_add_opt(&global_capture_opts, opt, optarg, &start_capture);
4051 /*** hidden option: Wireshark child mode (using binary output messages) ***/
4053 capture_child = TRUE;
4055 /* set output pipe to binary mode, to avoid ugly text conversions */
4056 _setmode(2, O_BINARY);
4058 * optarg = the control ID, aka the PPID, currently used for the
4061 if (strcmp(optarg, SIGNAL_PIPE_CTRL_ID_NONE) != 0) {
4062 sig_pipe_name = g_strdup_printf(SIGNAL_PIPE_FORMAT, optarg);
4063 sig_pipe_handle = CreateFile(utf_8to16(sig_pipe_name),
4064 GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
4066 if (sig_pipe_handle == INVALID_HANDLE_VALUE) {
4067 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4068 "Signal pipe: Unable to open %s. Dead parent?",
4076 case 'q': /* Quiet */
4084 /*** all non capture option specific ***/
4085 case 'D': /* Print a list of capture devices and exit */
4086 list_interfaces = TRUE;
4089 case 'L': /* Print list of link-layer types and exit */
4090 list_link_layer_types = TRUE;
4093 #ifdef HAVE_BPF_IMAGE
4094 case 'd': /* Print BPF code for capture filter and exit */
4095 print_bpf_code = TRUE;
4099 case 'S': /* Print interface statistics once a second */
4100 print_statistics = TRUE;
4103 case 'M': /* For -D, -L, and -S, print machine-readable output */
4104 machine_readable = TRUE;
4107 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. */
4151 if (global_capture_opts.ifaces->len > 1) {
4153 global_capture_opts.use_pcapng = TRUE;
4156 /* Was the ring buffer option specified and, if so, does it make sense? */
4157 if (global_capture_opts.multi_files_on) {
4158 /* Ring buffer works only under certain conditions:
4159 a) ring buffer does not work with temporary files;
4160 b) it makes no sense to enable the ring buffer if the maximum
4161 file size is set to "infinite". */
4162 if (global_capture_opts.save_file == NULL) {
4163 cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
4164 global_capture_opts.multi_files_on = FALSE;
4166 if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
4167 cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
4169 /* XXX - this must be redesigned as the conditions changed */
4170 global_capture_opts.multi_files_on = FALSE;
4177 * "-D" requires no interface to be selected; it's supposed to list
4180 if (list_interfaces) {
4181 /* Get the list of interfaces */
4186 if_list = capture_interface_list(&err, &err_str);
4187 if (if_list == NULL) {
4189 case CANT_GET_INTERFACE_LIST:
4190 cmdarg_err("%s", err_str);
4195 case NO_INTERFACES_FOUND:
4197 * If we're being run by another program, just give them
4198 * an empty list of interfaces, don't report this as
4199 * an error; that lets them decide whether to report
4200 * this as an error or not.
4202 if (!machine_readable) {
4203 cmdarg_err("There are no interfaces on which a capture can be done");
4210 if (machine_readable) /* tab-separated values to stdout */
4211 print_machine_readable_interfaces(if_list);
4213 capture_opts_print_interfaces(if_list);
4214 free_interface_list(if_list);
4219 * "-S" requires no interface to be selected; it gives statistics
4220 * for all interfaces.
4222 if (print_statistics) {
4223 status = print_statistics_loop(machine_readable);
4228 * "-L", "-d", and capturing act on a particular interface, so we have to
4229 * have an interface; if none was specified, pick a default.
4231 if (capture_opts_trim_iface(&global_capture_opts, NULL) == FALSE) {
4232 /* cmdarg_err() already called .... */
4236 /* Let the user know what interfaces were chosen. */
4237 /* get_interface_descriptive_name() is not available! */
4238 for (j = 0; j < global_capture_opts.ifaces->len; j++) {
4239 interface_options interface_opts;
4241 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, j);
4242 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Interface: %s", interface_opts.name);
4245 if (list_link_layer_types) {
4246 /* Get the list of link-layer types for the capture device. */
4247 if_capabilities_t *caps;
4251 for (i = 0; i < global_capture_opts.ifaces->len; i++) {
4252 interface_options interface_opts;
4254 interface_opts = g_array_index(global_capture_opts.ifaces, interface_options, i);
4255 caps = get_if_capabilities(interface_opts.name,
4256 interface_opts.monitor_mode, &err_str);
4258 cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s).\n"
4259 "Please check to make sure you have sufficient permissions, and that\n"
4260 "you have the proper interface or pipe specified.", interface_opts.name, err_str);
4264 if (caps->data_link_types == NULL) {
4265 cmdarg_err("The capture device \"%s\" has no data link types.", interface_opts.name);
4268 if (machine_readable) /* tab-separated values to stdout */
4269 /* XXX: We need to change the format and adopt consumers */
4270 print_machine_readable_if_capabilities(caps);
4272 /* XXX: We might want to print also the interface name */
4273 capture_opts_print_if_capabilities(caps, interface_opts.name,
4274 interface_opts.monitor_mode);
4275 free_if_capabilities(caps);
4280 /* We're supposed to do a capture, or print the BPF code for a filter.
4281 Process the snapshot length, as that affects the generated BPF code. */
4282 capture_opts_trim_snaplen(&global_capture_opts, MIN_PACKET_SIZE);
4284 #ifdef HAVE_BPF_IMAGE
4285 if (print_bpf_code) {
4286 show_filter_code(&global_capture_opts);
4291 /* We're supposed to do a capture. Process the ring buffer arguments. */
4292 capture_opts_trim_ring_num_files(&global_capture_opts);
4294 /* Now start the capture. */
4296 if(capture_loop_start(&global_capture_opts, &stats_known, &stats) == TRUE) {
4300 /* capture failed */
4303 return 0; /* never here, make compiler happy */
4308 console_log_handler(const char *log_domain, GLogLevelFlags log_level,
4309 const char *message, gpointer user_data _U_)
4316 /* ignore log message, if log_level isn't interesting */
4317 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4318 #if !defined(DEBUG_DUMPCAP) && !defined(DEBUG_CHILD_DUMPCAP)
4323 /* create a "timestamp" */
4325 today = localtime(&curr);
4327 switch(log_level & G_LOG_LEVEL_MASK) {
4328 case G_LOG_LEVEL_ERROR:
4331 case G_LOG_LEVEL_CRITICAL:
4334 case G_LOG_LEVEL_WARNING:
4337 case G_LOG_LEVEL_MESSAGE:
4340 case G_LOG_LEVEL_INFO:
4343 case G_LOG_LEVEL_DEBUG:
4347 fprintf(stderr, "unknown log_level %u\n", log_level);
4349 g_assert_not_reached();
4352 /* Generate the output message */
4353 if(log_level & G_LOG_LEVEL_MESSAGE) {
4354 /* normal user messages without additional infos */
4355 msg = g_strdup_printf("%s\n", message);
4357 /* info/debug messages with additional infos */
4358 msg = g_strdup_printf("%02u:%02u:%02u %8s %s %s\n",
4359 today->tm_hour, today->tm_min, today->tm_sec,
4360 log_domain != NULL ? log_domain : "",
4364 /* DEBUG & INFO msgs (if we're debugging today) */
4365 #if defined(DEBUG_DUMPCAP) || defined(DEBUG_CHILD_DUMPCAP)
4366 if( !(log_level & G_LOG_LEVEL_MASK & ~(G_LOG_LEVEL_DEBUG|G_LOG_LEVEL_INFO))) {
4367 #ifdef DEBUG_DUMPCAP
4368 fprintf(stderr, "%s", msg);
4371 #ifdef DEBUG_CHILD_DUMPCAP
4372 fprintf(debug_log, "%s", msg);
4380 /* ERROR, CRITICAL, WARNING, MESSAGE messages goto stderr or */
4381 /* to parent especially formatted if dumpcap running as child. */
4382 if (capture_child) {
4383 sync_pipe_errmsg_to_parent(2, msg, "");
4385 fprintf(stderr, "%s", msg);
4392 /****************************************************************************************************************/
4393 /* indication report routines */
4397 report_packet_count(int packet_count)
4399 char tmp[SP_DECISIZE+1+1];
4400 static int count = 0;
4403 g_snprintf(tmp, sizeof(tmp), "%d", packet_count);
4404 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Packets: %s", tmp);
4405 pipe_write_block(2, SP_PACKET_COUNT, tmp);
4407 count += packet_count;
4408 fprintf(stderr, "\rPackets: %u ", count);
4409 /* stderr could be line buffered */
4415 report_new_capture_file(const char *filename)
4418 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "File: %s", filename);
4419 pipe_write_block(2, SP_FILE, filename);
4423 * Prevent a SIGINFO handler from writing to the standard error
4424 * while we're doing so; instead, have it just set a flag telling
4425 * us to print that information when we're done.
4428 #endif /* SIGINFO */
4429 fprintf(stderr, "File: %s\n", filename);
4430 /* stderr could be line buffered */
4435 * Allow SIGINFO handlers to write.
4440 * If a SIGINFO handler asked us to write out capture counts, do so.
4443 report_counts_for_siginfo();
4444 #endif /* SIGINFO */
4449 report_cfilter_error(capture_options *capture_opts, guint i, const char *errmsg)
4451 interface_options interface_opts;
4452 char tmp[MSG_MAX_LENGTH+1+6];
4454 if (i < capture_opts->ifaces->len) {
4455 if (capture_child) {
4456 g_snprintf(tmp, sizeof(tmp), "%u:%s", i, errmsg);
4457 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Capture filter error: %s", errmsg);
4458 pipe_write_block(2, SP_BAD_FILTER, tmp);
4461 * clopts_step_invalid_capfilter in test/suite-clopts.sh MUST match
4462 * the error message below.
4464 interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
4466 "Invalid capture filter \"%s\" for interface %s!\n"
4468 "That string isn't a valid capture filter (%s).\n"
4469 "See the User's Guide for a description of the capture filter syntax.\n",
4470 interface_opts.cfilter, interface_opts.name, errmsg);
4476 report_capture_error(const char *error_msg, const char *secondary_error_msg)
4479 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4480 "Primary Error: %s", error_msg);
4481 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4482 "Secondary Error: %s", secondary_error_msg);
4483 sync_pipe_errmsg_to_parent(2, error_msg, secondary_error_msg);
4485 fprintf(stderr, "%s\n", error_msg);
4486 if (secondary_error_msg[0] != '\0')
4487 fprintf(stderr, "%s\n", secondary_error_msg);
4492 report_packet_drops(guint32 received, guint32 drops, gchar *name)
4494 char tmp[SP_DECISIZE+1+1];
4496 g_snprintf(tmp, sizeof(tmp), "%u", drops);
4499 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4500 "Packets received/dropped on interface %s: %u/%u",
4501 name, received, drops);
4502 /* XXX: Need to provide interface id, changes to consumers required. */
4503 pipe_write_block(2, SP_DROPS, tmp);
4506 "Packets received/dropped on interface %s: %u/%u (%.1f%%)\n",
4507 name, received, drops,
4508 received ? 100.0 * received / (received + drops) : 0.0);
4509 /* stderr could be line buffered */
4515 /****************************************************************************************************************/
4516 /* signal_pipe handling */
4521 signal_pipe_check_running(void)
4523 /* any news from our parent? -> just stop the capture */
4527 /* if we are running standalone, no check required */
4528 if(!capture_child) {
4532 if(!sig_pipe_name || !sig_pipe_handle) {
4533 /* This shouldn't happen */
4534 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4535 "Signal pipe: No name or handle");
4540 * XXX - We should have the process ID of the parent (from the "-Z" flag)
4541 * at this point. Should we check to see if the parent is still alive,
4542 * e.g. by using OpenProcess?
4545 result = PeekNamedPipe(sig_pipe_handle, NULL, 0, NULL, &avail, NULL);
4547 if(!result || avail > 0) {
4548 /* peek failed or some bytes really available */
4549 /* (if not piping from stdin this would fail) */
4550 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO,
4551 "Signal pipe: Stop capture: %s", sig_pipe_name);
4552 g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
4553 "Signal pipe: %s (%p) result: %u avail: %u", sig_pipe_name,
4554 sig_pipe_handle, result, avail);
4557 /* pipe ok and no bytes available */
4564 * Editor modelines - http://www.wireshark.org/tools/modelines.html
4569 * indent-tabs-mode: nil
4572 * vi: set shiftwidth=4 tabstop=8 expandtab
4573 * :indentSize=4:tabSize=8:noTabs=true: