2 * Routines for packet capture windows
4 * $Id: capture.c,v 1.208 2003/07/23 05:01:15 guy Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@ethereal.com>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #ifdef HAVE_SYS_STAT_H
32 # include <sys/stat.h>
35 #ifdef HAVE_SYS_WAIT_H
36 # include <sys/wait.h>
41 * Define various POSIX macros (and, in the case of WCOREDUMP, non-POSIX
42 * macros) on UNIX systems that don't have them.
45 # define WIFEXITED(status) (((status) & 0177) == 0)
48 # define WIFSTOPPED(status) (((status) & 0177) == 0177)
51 # define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status))
54 # define WEXITSTATUS(status) ((status) >> 8)
57 # define WTERMSIG(status) ((status) & 0177)
60 # define WCOREDUMP(status) ((status) & 0200)
63 # define WSTOPSIG(status) ((status) >> 8)
87 #ifdef HAVE_SYS_SOCKET_H
88 #include <sys/socket.h>
91 #ifdef HAVE_SYS_IOCTL_H
92 #include <sys/ioctl.h>
100 #ifdef NEED_SNPRINTF_H
101 # include "snprintf.h"
105 #include <process.h> /* For spawning child process */
109 * XXX - the various BSDs appear to define BSD in <sys/param.h>; we don't
110 * want to include it if it's not present on this platform, however.
112 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || defined(__APPLE__)
116 #endif /* defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__bsdi__) || defined(__APPLE__) */
119 * We don't want to do a "select()" on the pcap_t's file descriptor on
120 * BSD (because "select()" doesn't work correctly on BPF devices on at
121 * least some releases of some flavors of BSD), and we don't want to do
122 * it on Windows (because "select()" is something for sockets, not for
123 * arbitrary handles).
125 * We *do* want to do it on other platforms, as, on other platforms (with
126 * the possible exception of Ultrix and Digital UNIX), the read timeout
127 * doesn't expire if no packets have arrived, so a "pcap_dispatch()" call
128 * will block until packets arrive, causing the UI to hang.
130 #if !defined(BSD) && !defined(_WIN32)
131 # define MUST_DO_SELECT
134 #include <epan/packet.h>
138 #include "pcap-util.h"
139 #include "simple_dialog.h"
142 #include "conditions.h"
143 #include "capture_stop_conditions.h"
144 #include "ringbuffer.h"
146 #include "wiretap/libpcap.h"
147 #include "wiretap/wtap.h"
148 #include "wiretap/wtap-capture.h"
150 #include "packet-atalk.h"
151 #include "packet-atm.h"
152 #include "packet-clip.h"
153 #include "packet-eth.h"
154 #include "packet-fddi.h"
155 #include "packet-null.h"
156 #include "packet-ppp.h"
157 #include "packet-raw.h"
158 #include "packet-sll.h"
159 #include "packet-tr.h"
160 #include "packet-ieee80211.h"
161 #include "packet-chdlc.h"
162 #include "packet-prism.h"
163 #include "packet-ipfc.h"
164 #include "packet-arcnet.h"
167 #include "capture-wpcap.h"
173 capture_options capture_opts;
175 static int sync_pipe[2]; /* used to sync father */
176 enum PIPES { READ, WRITE }; /* Constants 0 and 1 for READ and WRITE */
177 int quit_after_cap; /* Makes a "capture only mode". Implies -k */
178 gboolean capture_child; /* if this is the child for "-S" */
179 static int fork_child = -1; /* If not -1, in parent, process ID of child */
180 static guint cap_input_id;
183 * Indications sent out on the sync pipe.
185 #define SP_CAPSTART ';' /* capture start message */
186 #define SP_PACKET_COUNT '*' /* followed by count of packets captured since last message */
187 #define SP_ERROR_MSG '!' /* followed by length of error message that follows */
188 #define SP_DROPS '#' /* followed by count of packets dropped in capture */
191 static guint cap_timer_id;
192 static int cap_timer_cb(gpointer); /* Win32 kludge to check for pipe input */
195 static void cap_file_input_cb(gpointer, gint, GdkInputCondition);
196 static void wait_for_child(gboolean);
198 static char *signame(int);
200 static void capture_delete_cb(GtkWidget *, GdkEvent *, gpointer);
201 static void capture_stop_cb(GtkWidget *, gpointer);
202 static void capture_pcap_cb(guchar *, const struct pcap_pkthdr *,
204 static void get_capture_file_io_error(char *, int, const char *, int, gboolean);
205 static void popup_errmsg(const char *);
206 static void send_errmsg_to_parent(const char *);
207 static float pct(gint, gint);
208 static void stop_capture(int signo);
210 typedef struct _loop_data {
211 gboolean go; /* TRUE as long as we're supposed to keep capturing */
212 gint max; /* Number of packets we're supposed to capture - 0 means infinite */
213 int err; /* if non-zero, error seen while capturing */
216 gboolean pcap_err; /* TRUE if error from pcap */
217 gboolean from_pipe; /* TRUE if we are capturing data from a pipe */
218 packet_counts counts;
221 gboolean modified; /* TRUE if data in the pipe uses modified pcap headers */
222 gboolean byte_swapped; /* TRUE if data in the pipe is byte swapped */
223 unsigned int bytes_to_read, bytes_read; /* Used by pipe_dispatch */
225 STATE_EXPECT_REC_HDR, STATE_READ_REC_HDR,
226 STATE_EXPECT_DATA, STATE_READ_DATA
229 enum { PIPOK, PIPEOF, PIPERR, PIPNEXIST } pipe_err;
234 static void adjust_header(loop_data *, struct pcap_hdr *, struct pcaprec_hdr *);
235 static int pipe_open_live(char *, struct pcap_hdr *, loop_data *, char *, int);
236 static int pipe_dispatch(int, loop_data *, struct pcap_hdr *, \
237 struct pcaprec_modified_hdr *, guchar *, char *, int);
240 /* Win32 needs the O_BINARY flag for open() */
246 /* Win32 needs a handle to the child capture process */
250 /* Add a string pointer to a NULL-terminated array of string pointers. */
252 add_arg(char **args, int *argc, char *arg)
254 /* Grow the array; "*argc" currently contains the number of string
255 pointers, *not* counting the NULL pointer at the end, so we have
256 to add 2 in order to get the new size of the array, including the
257 new pointer and the terminating NULL pointer. */
258 args = g_realloc(args, (*argc + 2) * sizeof (char *));
260 /* Stuff the pointer into the penultimate element of the array, which
261 is the one at the index specified by "*argc". */
264 /* Now bump the count. */
267 /* We overwrite the NULL pointer; put it back right after the
275 /* Given a string, return a pointer to a quote-encapsulated version of
276 the string, so we can pass it as an argument with "spawnvp" even
277 if it contains blanks. */
279 quote_encapsulate(const char *string)
281 char *encapsulated_string;
283 encapsulated_string = g_new(char, strlen(string) + 3);
284 sprintf(encapsulated_string, "\"%s\"", string);
285 return encapsulated_string;
289 /* Open a specified file, or create a temporary file, and start a capture
290 to the file in question. */
292 do_capture(const char *save_file)
295 gboolean is_tempfile;
301 int capture_succeeded;
302 gboolean stats_known;
303 struct pcap_stat stats;
306 if (save_file != NULL) {
307 /* If the Sync option is set, we return to the caller while the capture
308 * is in progress. Therefore we need to take a copy of save_file in
309 * case the caller destroys it after we return.
311 capfile_name = g_strdup(save_file);
312 if (capture_opts.ringbuffer_on) {
313 /* ringbuffer is enabled */
314 cfile.save_file_fd = ringbuf_init(capfile_name,
315 capture_opts.ringbuffer_num_files);
317 /* Try to open/create the specified file for use as a capture buffer. */
318 cfile.save_file_fd = open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT,
323 /* Choose a random name for the capture buffer */
324 cfile.save_file_fd = create_tempfile(tmpname, sizeof tmpname, "ether");
325 capfile_name = g_strdup(tmpname);
328 if (cfile.save_file_fd == -1) {
330 simple_dialog(ESD_TYPE_CRIT, NULL,
331 "The temporary file to which the capture would be saved (\"%s\")"
332 "could not be opened: %s.", capfile_name, strerror(errno));
334 if (capture_opts.ringbuffer_on) {
335 ringbuf_error_cleanup();
337 simple_dialog(ESD_TYPE_CRIT, NULL,
338 file_open_error_message(errno, TRUE, WTAP_FILE_PCAP), capfile_name);
340 g_free(capfile_name);
343 close_cap_file(&cfile);
344 g_assert(cfile.save_file == NULL);
345 cfile.save_file = capfile_name;
346 /* cfile.save_file is "g_free"ed below, which is equivalent to
347 "g_free(capfile_name)". */
349 if (capture_opts.sync_mode) { /* do the capture in a child process */
351 char scount[24]; /* need a constant for len of numbers */
352 char sautostop_filesize[24]; /* need a constant for len of numbers */
353 char sautostop_duration[24]; /* need a constant for len of numbers */
354 char save_file_fd[24];
360 char sync_pipe_fd[24];
365 /* Allocate the string pointer array with enough space for the
366 terminating NULL pointer. */
368 argv = g_malloc(sizeof (char *));
371 /* Now add those arguments used on all platforms. */
372 argv = add_arg(argv, &argc, CHILD_NAME);
374 argv = add_arg(argv, &argc, "-i");
375 argv = add_arg(argv, &argc, cfile.iface);
377 argv = add_arg(argv, &argc, "-w");
378 argv = add_arg(argv, &argc, cfile.save_file);
380 argv = add_arg(argv, &argc, "-W");
381 sprintf(save_file_fd,"%d",cfile.save_file_fd); /* in lieu of itoa */
382 argv = add_arg(argv, &argc, save_file_fd);
384 if (capture_opts.has_autostop_count) {
385 argv = add_arg(argv, &argc, "-c");
386 sprintf(scount,"%d",capture_opts.autostop_count);
387 argv = add_arg(argv, &argc, scount);
390 if (capture_opts.has_snaplen) {
391 argv = add_arg(argv, &argc, "-s");
392 sprintf(ssnap,"%d",capture_opts.snaplen);
393 argv = add_arg(argv, &argc, ssnap);
396 if (capture_opts.has_autostop_filesize) {
397 argv = add_arg(argv, &argc, "-a");
398 sprintf(sautostop_filesize,"filesize:%d",capture_opts.autostop_filesize);
399 argv = add_arg(argv, &argc, sautostop_filesize);
402 if (capture_opts.has_autostop_duration) {
403 argv = add_arg(argv, &argc, "-a");
404 sprintf(sautostop_duration,"duration:%d",capture_opts.autostop_duration);
405 argv = add_arg(argv, &argc, sautostop_duration);
408 if (!capture_opts.promisc_mode)
409 argv = add_arg(argv, &argc, "-p");
412 /* Create a pipe for the child process */
414 if(_pipe(sync_pipe, 512, O_BINARY) < 0) {
415 /* Couldn't create the pipe between parent and child. */
417 unlink(cfile.save_file);
418 g_free(cfile.save_file);
419 cfile.save_file = NULL;
420 simple_dialog(ESD_TYPE_CRIT, NULL, "Couldn't create sync pipe: %s",
425 /* Convert font name to a quote-encapsulated string and pass to child */
426 argv = add_arg(argv, &argc, "-m");
427 fontstring = quote_encapsulate(prefs.gui_font_name);
428 argv = add_arg(argv, &argc, fontstring);
430 /* Convert pipe write handle to a string and pass to child */
431 argv = add_arg(argv, &argc, "-Z");
432 itoa(sync_pipe[WRITE], sync_pipe_fd, 10);
433 argv = add_arg(argv, &argc, sync_pipe_fd);
435 /* Convert filter string to a quote delimited string and pass to child */
437 if (cfile.cfilter != NULL && strlen(cfile.cfilter) != 0) {
438 argv = add_arg(argv, &argc, "-f");
439 filterstring = quote_encapsulate(cfile.cfilter);
440 argv = add_arg(argv, &argc, filterstring);
444 fork_child = spawnvp(_P_NOWAIT, ethereal_path, argv);
447 g_free(filterstring);
449 /* Keep a copy for later evaluation by _cwait() */
450 child_process = fork_child;
452 if (pipe(sync_pipe) < 0) {
453 /* Couldn't create the pipe between parent and child. */
455 unlink(cfile.save_file);
456 g_free(cfile.save_file);
457 cfile.save_file = NULL;
458 simple_dialog(ESD_TYPE_CRIT, NULL, "Couldn't create sync pipe: %s",
463 argv = add_arg(argv, &argc, "-m");
464 argv = add_arg(argv, &argc, prefs.gui_font_name);
466 if (cfile.cfilter != NULL && strlen(cfile.cfilter) != 0) {
467 argv = add_arg(argv, &argc, "-f");
468 argv = add_arg(argv, &argc, cfile.cfilter);
471 if ((fork_child = fork()) == 0) {
473 * Child process - run Ethereal with the right arguments to make
474 * it just pop up the live capture dialog box and capture with
475 * the specified capture parameters, writing to the specified file.
477 * args: -i interface specification
479 * -W file descriptor to write
480 * -c count to capture
483 * -f "filter expression"
486 dup(sync_pipe[WRITE]);
487 close(sync_pipe[READ]);
488 execvp(ethereal_path, argv);
489 snprintf(errmsg, sizeof errmsg, "Couldn't run %s in child process: %s",
490 ethereal_path, strerror(errno));
491 send_errmsg_to_parent(errmsg);
493 /* Exit with "_exit()", so that we don't close the connection
494 to the X server (and cause stuff buffered up by our parent but
495 not yet sent to be sent, as that stuff should only be sent by
501 /* Parent process - read messages from the child process over the
503 g_free(argv); /* free up arg array */
505 /* Close the write side of the pipe, so that only the child has it
506 open, and thus it completely closes, and thus returns to us
507 an EOF indication, if the child closes it (either deliberately
508 or by exiting abnormally). */
509 close(sync_pipe[WRITE]);
511 /* Close the save file FD, as we won't be using it - we'll be opening
512 it and reading the save file through Wiretap. */
513 close(cfile.save_file_fd);
515 if (fork_child == -1) {
516 /* We couldn't even create the child process. */
518 close(sync_pipe[READ]);
519 unlink(cfile.save_file);
520 g_free(cfile.save_file);
521 cfile.save_file = NULL;
522 simple_dialog(ESD_TYPE_CRIT, NULL, "Couldn't create child process: %s",
527 /* Read a byte count from "sync_pipe[READ]", terminated with a
528 colon; if the count is 0, the child process created the
529 capture file and we should start reading from it, otherwise
530 the capture couldn't start and the count is a count of bytes
531 of error message, and we should display the message. */
534 i = read(sync_pipe[READ], &c, 1);
536 /* EOF - the child process died.
537 Close the read side of the sync pipe, remove the capture file,
538 and report the failure. */
539 close(sync_pipe[READ]);
540 unlink(cfile.save_file);
541 g_free(cfile.save_file);
542 cfile.save_file = NULL;
543 wait_for_child(TRUE);
546 if (c == SP_CAPSTART || c == SP_ERROR_MSG)
549 /* Child process handed us crap.
550 Close the read side of the sync pipe, remove the capture file,
551 and report the failure. */
552 close(sync_pipe[READ]);
553 unlink(cfile.save_file);
554 g_free(cfile.save_file);
555 cfile.save_file = NULL;
556 simple_dialog(ESD_TYPE_WARN, NULL,
557 "Capture child process sent us a bad message");
560 byte_count = byte_count*10 + c - '0';
562 if (c == SP_CAPSTART) {
563 /* Success. Open the capture file, and set up to read it. */
564 err = start_tail_cap_file(cfile.save_file, is_tempfile, &cfile);
566 /* We were able to open and set up to read the capture file;
567 arrange that our callback be called whenever it's possible
568 to read from the sync pipe, so that it's called when
569 the child process wants to tell us something. */
571 /* Tricky to use pipes in win9x, as no concept of wait. NT can
572 do this but that doesn't cover all win32 platforms. GTK can do
573 this but doesn't seem to work over processes. Attempt to do
574 something similar here, start a timer and check for data on every
576 cap_timer_id = gtk_timeout_add(1000, cap_timer_cb, NULL);
578 cap_input_id = gtk_input_add_full(sync_pipe[READ],
579 GDK_INPUT_READ|GDK_INPUT_EXCEPTION,
586 /* We weren't able to open the capture file; user has been
587 alerted. Close the sync pipe. */
589 close(sync_pipe[READ]);
591 /* Don't unlink the save file - leave it around, for debugging
593 g_free(cfile.save_file);
594 cfile.save_file = NULL;
597 /* Failure - the child process sent us a message indicating
598 what the problem was. */
599 if (byte_count == 0) {
600 /* Zero-length message? */
601 simple_dialog(ESD_TYPE_WARN, NULL,
602 "Capture child process failed, but its error message was empty.");
604 msg = g_malloc(byte_count + 1);
606 simple_dialog(ESD_TYPE_WARN, NULL,
607 "Capture child process failed, but its error message was too big.");
609 i = read(sync_pipe[READ], msg, byte_count);
610 msg[byte_count] = '\0';
612 simple_dialog(ESD_TYPE_WARN, NULL,
613 "Capture child process failed: Error %s reading its error message.",
616 simple_dialog(ESD_TYPE_WARN, NULL,
617 "Capture child process failed: EOF reading its error message.");
618 wait_for_child(FALSE);
620 simple_dialog(ESD_TYPE_CRIT, NULL, msg);
624 /* Close the sync pipe. */
625 close(sync_pipe[READ]);
627 /* Get rid of the save file - the capture never started. */
628 unlink(cfile.save_file);
629 g_free(cfile.save_file);
630 cfile.save_file = NULL;
635 capture_succeeded = capture(&stats_known, &stats);
636 if (quit_after_cap) {
637 /* DON'T unlink the save file. Presumably someone wants it. */
640 if (capture_succeeded) {
641 /* Capture succeeded; read in the capture file. */
642 if ((err = open_cap_file(cfile.save_file, is_tempfile, &cfile)) == 0) {
643 /* Set the read filter to NULL. */
646 /* Get the packet-drop statistics.
648 XXX - there are currently no packet-drop statistics stored
649 in libpcap captures, and that's what we're reading.
651 At some point, we will add support in Wiretap to return
652 packet-drop statistics for capture file formats that store it,
653 and will make "read_cap_file()" get those statistics from
654 Wiretap. We clear the statistics (marking them as "not known")
655 in "open_cap_file()", and "read_cap_file()" will only fetch
656 them and mark them as known if Wiretap supplies them, so if
657 we get the statistics now, after calling "open_cap_file()" but
658 before calling "read_cap_file()", the values we store will
659 be used by "read_cap_file()".
661 If a future libpcap capture file format stores the statistics,
662 we'll put them into the capture file that we write, and will
663 thus not have to set them here - "read_cap_file()" will get
664 them from the file and use them. */
666 cfile.drops_known = TRUE;
668 /* XXX - on some systems, libpcap doesn't bother filling in
669 "ps_ifdrop" - it doesn't even set it to zero - so we don't
670 bother looking at it.
672 Ideally, libpcap would have an interface that gave us
673 several statistics - perhaps including various interface
674 error statistics - and would tell us which of them it
675 supplies, allowing us to display only the ones it does. */
676 cfile.drops = stats.ps_drop;
678 switch (read_cap_file(&cfile, &err)) {
682 /* Just because we got an error, that doesn't mean we were unable
683 to read any of the file; we handle what we could get from the
688 /* Exit by leaving the main loop, so that any quit functions
689 we registered get called. */
690 if (gtk_main_level() > 0)
696 /* We're not doing a capture any more, so we don't have a save
698 if (capture_opts.ringbuffer_on) {
701 g_free(cfile.save_file);
703 cfile.save_file = NULL;
708 /* The timer has expired, see if there's stuff to read from the pipe,
709 if so call the cap_file_input_cb */
711 cap_timer_cb(gpointer data)
715 gboolean result, result1;
718 /* Oddly enough although Named pipes don't work on win9x,
719 PeekNamedPipe does !!! */
720 handle = (HANDLE) _get_osfhandle (sync_pipe[READ]);
721 result = PeekNamedPipe(handle, NULL, 0, NULL, &avail, NULL);
723 /* Get the child process exit status */
724 result1 = GetExitCodeProcess((HANDLE)child_process, &childstatus);
726 /* If the Peek returned an error, or there are bytes to be read
727 or the childwatcher thread has terminated then call the normal
729 if (!result || avail > 0 || childstatus != STILL_ACTIVE) {
731 /* avoid reentrancy problems and stack overflow */
732 gtk_timeout_remove(cap_timer_id);
734 /* And call the real handler */
735 cap_file_input_cb((gpointer) &cfile, 0, 0);
737 /* Return false so that the timer is not run again */
741 /* No data so let timer run again */
747 /* There's stuff to read from the sync pipe, meaning the child has sent
748 us a message, or the sync pipe has closed, meaning the child has
749 closed it (perhaps because it exited). */
751 cap_file_input_cb(gpointer data, gint source _U_,
752 GdkInputCondition condition _U_)
754 capture_file *cf = (capture_file *)data;
756 char buffer[BUFSIZE+1], *p = buffer, *q = buffer, *msg, *r;
757 int nread, msglen, chars_to_copy;
762 /* avoid reentrancy problems and stack overflow */
763 gtk_input_remove(cap_input_id);
766 if ((nread = read(sync_pipe[READ], buffer, BUFSIZE)) <= 0) {
767 /* The child has closed the sync pipe, meaning it's not going to be
768 capturing any more packets. Pick up its exit status, and
769 complain if it did anything other than exit with status 0. */
770 wait_for_child(FALSE);
772 /* Read what remains of the capture file, and finish the capture.
773 XXX - do something if this fails? */
774 switch (finish_tail_cap_file(cf, &err)) {
778 /* Just because we got an error, that doesn't mean we were unable
779 to read any of the file; we handle what we could get from the
784 /* Exit by leaving the main loop, so that any quit functions
785 we registered get called. */
790 /* We're not doing a capture any more, so we don't have a save
792 g_free(cf->save_file);
793 cf->save_file = NULL;
798 buffer[nread] = '\0';
801 /* look for (possibly multiple) indications */
803 case SP_PACKET_COUNT :
810 cf->drops_known = TRUE;
822 /* Read the entire message.
823 XXX - if the child hasn't sent it all yet, this could cause us
824 to hang until they do. */
825 msg = g_malloc(msglen + 1);
827 while (msglen != 0) {
830 if ((nread = read(sync_pipe[READ], buffer, BUFSIZE)) <= 0)
835 chars_to_copy = MIN(msglen, nread);
836 memcpy(r, q, chars_to_copy);
839 nread -= chars_to_copy;
840 msglen -= chars_to_copy;
843 simple_dialog(ESD_TYPE_CRIT, NULL, msg);
853 /* Read from the capture file the number of records the child told us
855 XXX - do something if this fails? */
856 switch (continue_tail_cap_file(cf, to_read, &err)) {
860 /* Just because we got an error, that doesn't mean we were unable
861 to read any of the file; we handle what we could get from the
864 XXX - abort on a read error? */
868 /* Kill the child capture process; the user wants to exit, and we
869 shouldn't just leave it running. */
873 kill(fork_child, SIGTERM); /* SIGTERM so it can clean up if necessary */
878 /* restore pipe handler */
880 cap_timer_id = gtk_timeout_add(1000, cap_timer_cb, NULL);
882 cap_input_id = gtk_input_add_full (sync_pipe[READ],
883 GDK_INPUT_READ|GDK_INPUT_EXCEPTION,
892 wait_for_child(gboolean always_report)
897 /* XXX - analyze the wait stuatus and display more information
898 in the dialog box? */
899 if (_cwait(&wstatus, child_process, _WAIT_CHILD) == -1) {
900 simple_dialog(ESD_TYPE_WARN, NULL, "Child capture process stopped unexpectedly");
903 if (wait(&wstatus) != -1) {
904 if (WIFEXITED(wstatus)) {
905 /* The child exited; display its exit status, if it's not zero,
906 and even if it's zero if "always_report" is true. */
907 if (always_report || WEXITSTATUS(wstatus) != 0) {
908 simple_dialog(ESD_TYPE_WARN, NULL,
909 "Child capture process exited: exit status %d",
910 WEXITSTATUS(wstatus));
912 } else if (WIFSTOPPED(wstatus)) {
913 /* It stopped, rather than exiting. "Should not happen." */
914 simple_dialog(ESD_TYPE_WARN, NULL,
915 "Child capture process stopped: %s",
916 signame(WSTOPSIG(wstatus)));
917 } else if (WIFSIGNALED(wstatus)) {
918 /* It died with a signal. */
919 simple_dialog(ESD_TYPE_WARN, NULL,
920 "Child capture process died: %s%s",
921 signame(WTERMSIG(wstatus)),
922 WCOREDUMP(wstatus) ? " - core dumped" : "");
924 /* What? It had to either have exited, or stopped, or died with
925 a signal; what happened here? */
926 simple_dialog(ESD_TYPE_WARN, NULL,
927 "Child capture process died: wait status %#o", wstatus);
931 /* No more child process. */
941 static char sigmsg_buf[6+1+3+1];
950 sigmsg = "Interrupted";
958 sigmsg = "Illegal instruction";
962 sigmsg = "Trace trap";
970 sigmsg = "Arithmetic exception";
978 sigmsg = "Bus error";
982 sigmsg = "Segmentation violation";
985 /* http://metalab.unc.edu/pub/Linux/docs/HOWTO/GCC-HOWTO
986 Linux is POSIX compliant. These are not POSIX-defined signals ---
987 ISO/IEC 9945-1:1990 (IEEE Std 1003.1-1990), paragraph B.3.3.1.1 sez:
989 ``The signals SIGBUS, SIGEMT, SIGIOT, SIGTRAP, and SIGSYS
990 were omitted from POSIX.1 because their behavior is
991 implementation dependent and could not be adequately catego-
992 rized. Conforming implementations may deliver these sig-
993 nals, but must document the circumstances under which they
994 are delivered and note any restrictions concerning their
997 So we only check for SIGSYS on those systems that happen to
998 implement them (a system can be POSIX-compliant and implement
999 them, it's just that POSIX doesn't *require* a POSIX-compliant
1000 system to implement them).
1005 sigmsg = "Bad system call";
1010 sigmsg = "Broken pipe";
1014 sigmsg = "Alarm clock";
1018 sigmsg = "Terminated";
1022 sprintf(sigmsg_buf, "Signal %d", sig);
1023 sigmsg = sigmsg_buf;
1031 * Timeout, in milliseconds, for reads from the stream of captured packets.
1033 #define CAP_READ_TIMEOUT 250
1036 /* Take care of byte order in the libpcap headers read from pipes.
1037 * (function taken from wiretap/libpcap.c) */
1039 adjust_header(loop_data *ld, struct pcap_hdr *hdr, struct pcaprec_hdr *rechdr)
1041 if (ld->byte_swapped) {
1042 /* Byte-swap the record header fields. */
1043 rechdr->ts_sec = BSWAP32(rechdr->ts_sec);
1044 rechdr->ts_usec = BSWAP32(rechdr->ts_usec);
1045 rechdr->incl_len = BSWAP32(rechdr->incl_len);
1046 rechdr->orig_len = BSWAP32(rechdr->orig_len);
1049 /* In file format version 2.3, the "incl_len" and "orig_len" fields were
1050 swapped, in order to match the BPF header layout.
1052 Unfortunately, some files were, according to a comment in the "libpcap"
1053 source, written with version 2.3 in their headers but without the
1054 interchanged fields, so if "incl_len" is greater than "orig_len" - which
1055 would make no sense - we assume that we need to swap them. */
1056 if (hdr->version_major == 2 &&
1057 (hdr->version_minor < 3 ||
1058 (hdr->version_minor == 3 && rechdr->incl_len > rechdr->orig_len))) {
1061 temp = rechdr->orig_len;
1062 rechdr->orig_len = rechdr->incl_len;
1063 rechdr->incl_len = temp;
1067 /* Mimic pcap_open_live() for pipe captures
1068 * We check if "pipename" is "-" (stdin) or a FIFO, open it, and read the
1070 * N.B. : we can't read the libpcap formats used in RedHat 6.1 or SuSE 6.3
1071 * because we can't seek on pipes (see wiretap/libpcap.c for details) */
1073 pipe_open_live(char *pipename, struct pcap_hdr *hdr, loop_data *ld,
1074 char *errmsg, int errmsgl)
1076 struct stat pipe_stat;
1080 unsigned int bytes_read;
1082 struct timeval timeout;
1085 * XXX Ethereal blocks until we return
1087 if (strcmp(pipename, "-") == 0)
1088 fd = 0; /* read from stdin */
1090 if (stat(pipename, &pipe_stat) < 0) {
1091 if (errno == ENOENT || errno == ENOTDIR)
1092 ld->pipe_err = PIPNEXIST;
1094 snprintf(errmsg, errmsgl,
1095 "The capture session could not be initiated "
1096 "due to error on pipe: %s", strerror(errno));
1097 ld->pipe_err = PIPERR;
1101 if (! S_ISFIFO(pipe_stat.st_mode)) {
1102 if (S_ISCHR(pipe_stat.st_mode)) {
1104 * Assume the user specified an interface on a system where
1105 * interfaces are in /dev. Pretend we haven't seen it.
1107 ld->pipe_err = PIPNEXIST;
1109 snprintf(errmsg, errmsgl,
1110 "The capture session could not be initiated because\n"
1111 "\"%s\" is neither an interface nor a pipe", pipename);
1112 ld->pipe_err = PIPERR;
1116 fd = open(pipename, O_RDONLY | O_NONBLOCK);
1118 snprintf(errmsg, errmsgl,
1119 "The capture session could not be initiated "
1120 "due to error on pipe open: %s", strerror(errno));
1121 ld->pipe_err = PIPERR;
1126 ld->from_pipe = TRUE;
1128 /* read the pcap header */
1131 while (bytes_read < sizeof magic) {
1134 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
1135 sel_ret = select(fd+1, &rfds, NULL, NULL, &timeout);
1137 snprintf(errmsg, errmsgl,
1138 "Unexpected error from select: %s", strerror(errno));
1140 } else if (sel_ret > 0) {
1141 b = read(fd, ((char *)&magic)+bytes_read, sizeof magic-bytes_read);
1144 snprintf(errmsg, errmsgl, "End of file on pipe during open");
1146 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
1156 /* Host that wrote it has our byte order, and was running
1157 a program using either standard or ss990417 libpcap. */
1158 ld->byte_swapped = FALSE;
1159 ld->modified = FALSE;
1161 case PCAP_MODIFIED_MAGIC:
1162 /* Host that wrote it has our byte order, but was running
1163 a program using either ss990915 or ss991029 libpcap. */
1164 ld->byte_swapped = FALSE;
1165 ld->modified = TRUE;
1167 case PCAP_SWAPPED_MAGIC:
1168 /* Host that wrote it has a byte order opposite to ours,
1169 and was running a program using either standard or
1170 ss990417 libpcap. */
1171 ld->byte_swapped = TRUE;
1172 ld->modified = FALSE;
1174 case PCAP_SWAPPED_MODIFIED_MAGIC:
1175 /* Host that wrote it out has a byte order opposite to
1176 ours, and was running a program using either ss990915
1177 or ss991029 libpcap. */
1178 ld->byte_swapped = TRUE;
1179 ld->modified = TRUE;
1182 /* Not a "libpcap" type we know about. */
1183 snprintf(errmsg, errmsgl, "Unrecognized libpcap format");
1187 /* Read the rest of the header */
1189 while (bytes_read < sizeof(struct pcap_hdr)) {
1192 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
1193 sel_ret = select(fd+1, &rfds, NULL, NULL, &timeout);
1195 snprintf(errmsg, errmsgl,
1196 "Unexpected error from select: %s", strerror(errno));
1198 } else if (sel_ret > 0) {
1199 b = read(fd, ((char *)hdr)+bytes_read,
1200 sizeof(struct pcap_hdr) - bytes_read);
1203 snprintf(errmsg, errmsgl, "End of file on pipe during open");
1205 snprintf(errmsg, errmsgl, "Error on pipe during open: %s",
1213 if (ld->byte_swapped) {
1214 /* Byte-swap the header fields about which we care. */
1215 hdr->version_major = BSWAP16(hdr->version_major);
1216 hdr->version_minor = BSWAP16(hdr->version_minor);
1217 hdr->snaplen = BSWAP32(hdr->snaplen);
1218 hdr->network = BSWAP32(hdr->network);
1221 if (hdr->version_major < 2) {
1222 snprintf(errmsg, errmsgl, "Unable to read old libpcap format");
1226 ld->pipe_state = STATE_EXPECT_REC_HDR;
1227 ld->pipe_err = PIPOK;
1231 ld->pipe_err = PIPERR;
1237 /* We read one record from the pipe, take care of byte order in the record
1238 * header, write the record in the capture file, and update capture statistics. */
1241 pipe_dispatch(int fd, loop_data *ld, struct pcap_hdr *hdr,
1242 struct pcaprec_modified_hdr *rechdr, guchar *data,
1243 char *errmsg, int errmsgl)
1245 struct pcap_pkthdr phdr;
1247 enum { PD_REC_HDR_READ, PD_DATA_READ, PD_PIPE_EOF, PD_PIPE_ERR,
1250 switch (ld->pipe_state) {
1252 case STATE_EXPECT_REC_HDR:
1253 ld->bytes_to_read = ld->modified ?
1254 sizeof(struct pcaprec_modified_hdr) : sizeof(struct pcaprec_hdr);
1256 ld->pipe_state = STATE_READ_REC_HDR;
1259 case STATE_READ_REC_HDR:
1260 b = read(fd, ((char *)rechdr)+ld->bytes_read,
1261 ld->bytes_to_read - ld->bytes_read);
1264 result = PD_PIPE_EOF;
1266 result = PD_PIPE_ERR;
1269 if ((ld->bytes_read += b) < ld->bytes_to_read)
1271 result = PD_REC_HDR_READ;
1274 case STATE_EXPECT_DATA:
1276 ld->pipe_state = STATE_READ_DATA;
1279 case STATE_READ_DATA:
1280 b = read(fd, data+ld->bytes_read, rechdr->hdr.incl_len - ld->bytes_read);
1283 result = PD_PIPE_EOF;
1285 result = PD_PIPE_ERR;
1288 if ((ld->bytes_read += b) < rechdr->hdr.incl_len)
1290 result = PD_DATA_READ;
1294 snprintf(errmsg, errmsgl, "pipe_dispatch: invalid state");
1297 } /* switch (ld->pipe_state) */
1300 * We've now read as much data as we were expecting, so process it.
1304 case PD_REC_HDR_READ:
1305 /* We've read the header. Take care of byte order. */
1306 adjust_header(ld, hdr, &rechdr->hdr);
1307 if (rechdr->hdr.incl_len > WTAP_MAX_PACKET_SIZE) {
1308 snprintf(errmsg, errmsgl, "Frame %u too long (%d bytes)",
1309 ld->counts.total+1, rechdr->hdr.incl_len);
1312 ld->pipe_state = STATE_EXPECT_DATA;
1316 /* Fill in a "struct pcap_pkthdr", and process the packet. */
1317 phdr.ts.tv_sec = rechdr->hdr.ts_sec;
1318 phdr.ts.tv_usec = rechdr->hdr.ts_usec;
1319 phdr.caplen = rechdr->hdr.incl_len;
1320 phdr.len = rechdr->hdr.orig_len;
1322 capture_pcap_cb((guchar *)ld, &phdr, data);
1324 ld->pipe_state = STATE_EXPECT_REC_HDR;
1328 ld->pipe_err = PIPEOF;
1332 snprintf(errmsg, errmsgl, "Error reading from pipe: %s",
1339 ld->pipe_err = PIPERR;
1340 /* Return here rather than inside the switch to prevent GCC warning */
1346 * This needs to be static, so that the SIGUSR1 handler can clear the "go"
1349 static loop_data ld;
1351 /* Do the low-level work of a capture.
1352 Returns TRUE if it succeeds, FALSE otherwise. */
1354 capture(gboolean *stats_known, struct pcap_stat *stats)
1356 GtkWidget *cap_w, *main_vb, *stop_bt, *counts_tb;
1357 GtkWidget *counts_fr, *running_tb, *running_label, *running_time;
1361 gchar open_err_str[PCAP_ERRBUF_SIZE];
1362 gchar lookup_net_err_str[PCAP_ERRBUF_SIZE];
1363 gchar label_str[64];
1364 bpf_u_int32 netnum, netmask;
1365 struct bpf_program fcode;
1366 time_t upd_time, cur_time;
1369 condition *cnd_stop_capturesize = NULL;
1370 condition *cnd_stop_timeout = NULL;
1371 condition *cnd_ring_timeout = NULL;
1373 static const char capstart_msg = SP_CAPSTART;
1374 char errmsg[4096+1];
1378 struct timeval timeout;
1382 GtkWidget *label, *value, *percent;
1384 { "Total", &ld.counts.total, NULL, NULL, NULL },
1385 { "SCTP", &ld.counts.sctp, NULL, NULL, NULL },
1386 { "TCP", &ld.counts.tcp, NULL, NULL, NULL },
1387 { "UDP", &ld.counts.udp, NULL, NULL, NULL },
1388 { "ICMP", &ld.counts.icmp, NULL, NULL, NULL },
1389 { "ARP", &ld.counts.arp, NULL, NULL, NULL },
1390 { "OSPF", &ld.counts.ospf, NULL, NULL, NULL },
1391 { "GRE", &ld.counts.gre, NULL, NULL, NULL },
1392 { "NetBIOS", &ld.counts.netbios, NULL, NULL, NULL },
1393 { "IPX", &ld.counts.ipx, NULL, NULL, NULL },
1394 { "VINES", &ld.counts.vines, NULL, NULL, NULL },
1395 { "Other", &ld.counts.other, NULL, NULL, NULL }
1398 #define N_COUNTS (sizeof counts / sizeof counts[0])
1401 WORD wVersionRequested;
1404 static const char ppamsg[] = "can't find PPA for ";
1408 struct pcap_hdr hdr;
1409 struct pcaprec_modified_hdr rechdr;
1410 guchar pcap_data[WTAP_MAX_PACKET_SIZE];
1412 #ifdef MUST_DO_SELECT
1416 /* Size of buffer to hold decimal representation of
1417 signed/unsigned 64-bit int */
1420 /* Initialize Windows Socket if we are in a WIN32 OS
1421 This needs to be done before querying the interface for network/netmask */
1423 /* XXX - do we really require 1.1 or earlier?
1424 Are there any versions that support only 2.0 or higher? */
1425 wVersionRequested = MAKEWORD(1, 1);
1426 err = WSAStartup(wVersionRequested, &wsaData);
1430 case WSASYSNOTREADY:
1431 snprintf(errmsg, sizeof errmsg,
1432 "Couldn't initialize Windows Sockets: Network system not ready for network communication");
1435 case WSAVERNOTSUPPORTED:
1436 snprintf(errmsg, sizeof errmsg,
1437 "Couldn't initialize Windows Sockets: Windows Sockets version %u.%u not supported",
1438 LOBYTE(wVersionRequested), HIBYTE(wVersionRequested));
1441 case WSAEINPROGRESS:
1442 snprintf(errmsg, sizeof errmsg,
1443 "Couldn't initialize Windows Sockets: Blocking operation is in progress");
1447 snprintf(errmsg, sizeof errmsg,
1448 "Couldn't initialize Windows Sockets: Limit on the number of tasks supported by this WinSock implementation has been reached");
1452 snprintf(errmsg, sizeof errmsg,
1453 "Couldn't initialize Windows Sockets: Bad pointer passed to WSAStartup");
1457 snprintf(errmsg, sizeof errmsg,
1458 "Couldn't initialize Windows Sockets: error %d", err);
1467 ld.counts.total = 0;
1468 if (capture_opts.has_autostop_count)
1469 ld.max = capture_opts.autostop_count;
1471 ld.max = 0; /* no limit */
1472 ld.err = 0; /* no error seen yet */
1473 ld.linktype = WTAP_ENCAP_UNKNOWN;
1474 ld.pcap_err = FALSE;
1475 ld.from_pipe = FALSE;
1476 ld.sync_packets = 0;
1484 ld.counts.netbios = 0;
1485 ld.counts.vines = 0;
1486 ld.counts.other = 0;
1490 /* We haven't yet gotten the capture statistics. */
1491 *stats_known = FALSE;
1493 /* Open the network interface to capture from it.
1494 Some versions of libpcap may put warnings into the error buffer
1495 if they succeed; to tell if that's happened, we have to clear
1496 the error buffer, and check if it's still a null string. */
1497 open_err_str[0] = '\0';
1498 pch = pcap_open_live(cfile.iface,
1499 capture_opts.has_snaplen ? capture_opts.snaplen :
1500 WTAP_MAX_PACKET_SIZE,
1501 capture_opts.promisc_mode, CAP_READ_TIMEOUT,
1505 /* We couldn't open "cfile.iface" as a network device. */
1507 /* On Windows, we don't support capturing on pipes, so we give up.
1508 If this is a child process that does the capturing in sync
1509 mode or fork mode, it shouldn't do any UI stuff until we pop up the
1510 capture-progress window, and, since we couldn't start the
1511 capture, we haven't popped it up. */
1512 if (!capture_child) {
1513 while (gtk_events_pending()) gtk_main_iteration();
1516 /* On Win32 OSes, the capture devices are probably available to all
1517 users; don't warn about permissions problems.
1519 Do, however, warn that WAN devices aren't supported. */
1520 snprintf(errmsg, sizeof errmsg,
1521 "The capture session could not be initiated (%s).\n"
1522 "Please check that you have the proper interface specified.\n"
1524 "Note that the driver Ethereal uses for packet capture on Windows doesn't\n"
1525 "support capturing on PPP/WAN interfaces in Windows NT/2000/XP/.NET Server.\n",
1529 /* try to open cfile.iface as a pipe */
1530 pipe_fd = pipe_open_live(cfile.iface, &hdr, &ld, errmsg, sizeof errmsg);
1532 if (pipe_fd == -1) {
1534 /* If this is a child process that does the capturing in sync
1535 * mode or fork mode, it shouldn't do any UI stuff until we pop up the
1536 * capture-progress window, and, since we couldn't start the
1537 * capture, we haven't popped it up.
1539 if (!capture_child) {
1540 while (gtk_events_pending()) gtk_main_iteration();
1543 if (ld.pipe_err == PIPNEXIST) {
1544 /* Pipe doesn't exist, so output message for interface */
1546 /* If we got a "can't find PPA for XXX" message, warn the user (who
1547 is running Ethereal on HP-UX) that they don't have a version
1548 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1549 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1550 PPA for XXX" rather than "can't find PPA for XXX"). */
1551 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1554 "You are running Ethereal with a version of the libpcap library\n"
1555 "that doesn't handle HP-UX network devices well; this means that\n"
1556 "Ethereal may not be able to capture packets.\n"
1558 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1559 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1560 "packaged binary form from the Software Porting And Archive Centre\n"
1561 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1562 "at the URL lists a number of mirror sites.";
1565 snprintf(errmsg, sizeof errmsg,
1566 "The capture session could not be initiated (%s).\n"
1567 "Please check to make sure you have sufficient permissions, and that\n"
1568 "you have the proper interface or pipe specified.%s", open_err_str,
1572 * Else pipe (or file) does exist and pipe_open_live() has
1577 /* pipe_open_live() succeeded; don't want
1578 error message from pcap_open_live() */
1579 open_err_str[0] = '\0';
1583 /* capture filters only work on real interfaces */
1584 if (cfile.cfilter && !ld.from_pipe) {
1585 /* A capture filter was specified; set it up. */
1586 if (pcap_lookupnet(cfile.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1588 * Well, we can't get the netmask for this interface; it's used
1589 * only for filters that check for broadcast IP addresses, so
1590 * we just punt and use 0. It might be nice to warn the user,
1591 * but that's a pain in a GUI application, as it'd involve popping
1592 * up a message box, and it's not clear how often this would make
1593 * a difference (only filters that check for IP broadcast addresses
1598 if (pcap_compile(pch, &fcode, cfile.cfilter, 1, netmask) < 0) {
1599 snprintf(errmsg, sizeof errmsg, "Unable to parse filter string (%s).",
1603 if (pcap_setfilter(pch, &fcode) < 0) {
1604 snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1610 /* Set up to write to the capture file. */
1613 pcap_encap = hdr.network;
1614 file_snaplen = hdr.snaplen;
1618 pcap_encap = get_pcap_linktype(pch, cfile.iface);
1619 file_snaplen = pcap_snapshot(pch);
1621 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1622 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1623 snprintf(errmsg, sizeof errmsg,
1624 "The network you're capturing from is of a type"
1625 " that Ethereal doesn't support (data link type %d).", pcap_encap);
1628 if (capture_opts.ringbuffer_on) {
1629 ld.pdh = ringbuf_init_wtap_dump_fdopen(WTAP_FILE_PCAP, ld.linktype,
1630 file_snaplen, &err);
1632 ld.pdh = wtap_dump_fdopen(cfile.save_file_fd, WTAP_FILE_PCAP,
1633 ld.linktype, file_snaplen, &err);
1636 if (ld.pdh == NULL) {
1637 /* We couldn't set up to write to the capture file. */
1640 case WTAP_ERR_CANT_OPEN:
1641 strcpy(errmsg, "The file to which the capture would be saved"
1642 " couldn't be created for some unknown reason.");
1645 case WTAP_ERR_SHORT_WRITE:
1646 strcpy(errmsg, "A full header couldn't be written to the file"
1647 " to which the capture would be saved.");
1652 snprintf(errmsg, sizeof(errmsg),
1653 "The file to which the capture would be"
1654 " saved (\"%s\") could not be opened: Error %d.",
1655 cfile.save_file, err);
1657 snprintf(errmsg, sizeof(errmsg),
1658 "The file to which the capture would be"
1659 " saved (\"%s\") could not be opened: %s.",
1660 cfile.save_file, strerror(err));
1667 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1668 returned a warning; print it, but keep capturing. */
1669 if (open_err_str[0] != '\0')
1670 g_warning("%s.", open_err_str);
1672 /* XXX - capture SIGTERM and close the capture, in case we're on a
1673 Linux 2.0[.x] system and you have to explicitly close the capture
1674 stream in order to turn promiscuous mode off? We need to do that
1675 in other places as well - and I don't think that works all the
1676 time in any case, due to libpcap bugs. */
1678 if (capture_child) {
1679 /* Well, we should be able to start capturing.
1681 This is the child process for a sync mode capture, so sync out
1682 the capture file, so the header makes it to the file system,
1683 and send a "capture started successfully and capture file created"
1684 message to our parent so that they'll open the capture file and
1685 update its windows to indicate that we have a live capture in
1687 fflush(wtap_dump_file(ld.pdh));
1688 write(1, &capstart_msg, 1);
1691 cap_w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
1692 gtk_window_set_title(GTK_WINDOW(cap_w), "Ethereal: Capture");
1693 gtk_window_set_modal(GTK_WINDOW(cap_w), TRUE);
1695 /* Container for capture display widgets */
1696 main_vb = gtk_vbox_new(FALSE, 1);
1697 gtk_container_border_width(GTK_CONTAINER(main_vb), 5);
1698 gtk_container_add(GTK_CONTAINER(cap_w), main_vb);
1699 gtk_widget_show(main_vb);
1701 counts_fr = gtk_frame_new("Captured Frames");
1702 gtk_box_pack_start(GTK_BOX(main_vb), counts_fr, FALSE, FALSE, 3);
1703 gtk_widget_show(counts_fr);
1705 /* Individual statistic elements */
1706 counts_tb = gtk_table_new(N_COUNTS, 3, TRUE);
1707 gtk_container_add(GTK_CONTAINER(counts_fr), counts_tb);
1708 gtk_container_border_width(GTK_CONTAINER(counts_tb), 5);
1709 gtk_widget_show(counts_tb);
1711 for (i = 0; i < N_COUNTS; i++) {
1712 counts[i].label = gtk_label_new(counts[i].title);
1713 gtk_misc_set_alignment(GTK_MISC(counts[i].label), 0.0f, 0.0f);
1715 counts[i].value = gtk_label_new("0");
1716 gtk_misc_set_alignment(GTK_MISC(counts[i].value), 0.0f, 0.0f);
1718 counts[i].percent = gtk_label_new("0.0%");
1719 gtk_misc_set_alignment(GTK_MISC(counts[i].percent), 0.0f, 0.0f);
1721 gtk_table_attach_defaults(GTK_TABLE(counts_tb),
1722 counts[i].label, 0, 1, i, i + 1);
1724 gtk_table_attach(GTK_TABLE(counts_tb),
1726 1, 2, i, i + 1, 0, 0, 5, 0);
1728 gtk_table_attach_defaults(GTK_TABLE(counts_tb),
1729 counts[i].percent, 2, 3, i, i + 1);
1731 gtk_widget_show(counts[i].label);
1732 gtk_widget_show(counts[i].value);
1733 gtk_widget_show(counts[i].percent);
1737 running_tb = gtk_table_new(1, 3, TRUE);
1738 gtk_box_pack_start(GTK_BOX(main_vb), running_tb, FALSE, FALSE, 3);
1739 gtk_widget_show(running_tb);
1741 running_label = gtk_label_new("Running");
1742 gtk_misc_set_alignment(GTK_MISC(running_label), 0.0f, 0.0f);
1743 gtk_widget_show(running_label);
1744 gtk_table_attach_defaults(GTK_TABLE(running_tb),
1745 running_label, 0, 1, 0, 1);
1747 running_time = gtk_label_new("00:00:00");
1748 gtk_misc_set_alignment(GTK_MISC(running_time), 0.0f, 0.0f);
1749 gtk_widget_show(running_time);
1750 gtk_table_attach(GTK_TABLE(running_tb),
1752 1, 2, 0, 1, 0, 0, 5, 0);
1754 /* allow user to either click a stop button, or the close button on
1755 the window to stop a capture in progress. */
1756 stop_bt = gtk_button_new_with_label ("Stop");
1757 gtk_signal_connect(GTK_OBJECT(stop_bt), "clicked",
1758 GTK_SIGNAL_FUNC(capture_stop_cb), (gpointer) &ld);
1759 gtk_signal_connect(GTK_OBJECT(cap_w), "delete_event",
1760 GTK_SIGNAL_FUNC(capture_delete_cb), (gpointer) &ld);
1761 gtk_box_pack_start(GTK_BOX(main_vb), stop_bt, FALSE, FALSE, 3);
1762 GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
1763 gtk_widget_grab_default(stop_bt);
1764 GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
1765 gtk_widget_grab_default(stop_bt);
1766 gtk_widget_show(stop_bt);
1768 gtk_widget_show(cap_w);
1770 start_time = time(NULL);
1771 upd_time = time(NULL);
1772 #ifdef MUST_DO_SELECT
1773 if (!ld.from_pipe) pcap_fd = pcap_fileno(pch);
1778 * Catch SIGUSR1, so that we exit cleanly if the parent process
1779 * kills us with it due to the user selecting "Capture->Stop".
1782 signal(SIGUSR1, stop_capture);
1784 /* initialize capture stop conditions */
1785 init_capture_stop_conditions();
1786 /* create stop conditions */
1787 if (capture_opts.has_autostop_filesize)
1788 cnd_stop_capturesize =
1789 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts.autostop_filesize * 1000);
1790 if (capture_opts.has_autostop_duration)
1792 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts.autostop_duration);
1794 if (capture_opts.ringbuffer_on && capture_opts.has_ring_duration)
1796 cnd_new(CND_CLASS_TIMEOUT, capture_opts.ringbuffer_duration);
1799 while (gtk_events_pending()) gtk_main_iteration();
1804 FD_SET(pipe_fd, &set1);
1806 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
1807 sel_ret = select(pipe_fd+1, &set1, NULL, NULL, &timeout);
1810 if (sel_ret < 0 && errno != EINTR) {
1811 snprintf(errmsg, sizeof(errmsg),
1812 "Unexpected error from select: %s", strerror(errno));
1813 popup_errmsg(errmsg);
1818 * "select()" says we can read from the pipe without blocking
1820 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1821 errmsg, sizeof errmsg);
1830 #ifdef MUST_DO_SELECT
1832 * Sigh. The semantics of the read timeout argument to
1833 * "pcap_open_live()" aren't particularly well specified by
1834 * the "pcap" man page - at least with the BSD BPF code, the
1835 * intent appears to be, at least in part, a way of cutting
1836 * down the number of reads done on a capture, by blocking
1837 * until the buffer fills or a timer expires - and the Linux
1838 * libpcap doesn't actually support it, so we can't use it
1839 * to break out of the "pcap_dispatch()" every 1/4 of a second
1840 * or so. Linux's libpcap is not the only libpcap that doesn't
1841 * support the read timeout.
1843 * Furthermore, at least on Solaris, the bufmod STREAMS module's
1844 * read timeout won't go off if no data has arrived, i.e. it cannot
1845 * be used to guarantee that a read from a DLPI stream will return
1846 * within a specified amount of time regardless of whether any
1847 * data arrives or not.
1849 * Thus, on all platforms other than BSD, we do a "select()" on the
1850 * file descriptor for the capture, with a timeout of CAP_READ_TIMEOUT
1851 * milliseconds, or CAP_READ_TIMEOUT*1000 microseconds.
1853 * "select()", on BPF devices, doesn't work as you might expect;
1854 * at least on some versions of some flavors of BSD, the timer
1855 * doesn't start until a read is done, so it won't expire if
1856 * only a "select()" or "poll()" is posted.
1859 FD_SET(pcap_fd, &set1);
1861 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
1862 sel_ret = select(pcap_fd+1, &set1, NULL, NULL, &timeout);
1865 * "select()" says we can read from it without blocking; go for
1868 inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (guchar *) &ld);
1875 if (sel_ret < 0 && errno != EINTR) {
1876 snprintf(errmsg, sizeof(errmsg),
1877 "Unexpected error from select: %s", strerror(errno));
1878 popup_errmsg(errmsg);
1883 inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (guchar *) &ld);
1892 ld.sync_packets += inpkts;
1893 /* check capture stop conditons */
1894 if (cnd_stop_capturesize != NULL && cnd_eval(cnd_stop_capturesize,
1895 (guint32)wtap_get_bytes_dumped(ld.pdh))){
1896 /* Capture file reached its maximum size. */
1897 if (capture_opts.ringbuffer_on) {
1898 /* Switch to the next ringbuffer file */
1899 if (ringbuf_switch_file(&cfile, &ld.pdh, &ld.err)) {
1900 /* File switch succeeded: reset the condition */
1901 cnd_reset(cnd_stop_capturesize);
1902 if (cnd_ring_timeout) {
1903 cnd_reset(cnd_ring_timeout);
1906 /* File switch failed: stop here */
1911 /* no ringbuffer - just stop */
1917 /* Only update once a second so as not to overload slow displays */
1918 cur_time = time(NULL);
1919 if (cur_time > upd_time) {
1920 upd_time = cur_time;
1922 /* calculate and display running time */
1923 cur_time -= start_time;
1924 snprintf(label_str, sizeof(label_str), "%02ld:%02ld:%02ld",
1925 (long)(cur_time/3600), (long)((cur_time%3600)/60),
1926 (long)(cur_time%60));
1927 gtk_label_set(GTK_LABEL(running_time), label_str);
1929 if (ld.sync_packets) {
1931 for (i = 0; i < N_COUNTS; i++) {
1932 snprintf(label_str, sizeof(label_str), "%d",
1933 *counts[i].value_ptr);
1935 gtk_label_set(GTK_LABEL(counts[i].value), label_str);
1937 snprintf(label_str, sizeof(label_str), "(%.1f%%)",
1938 pct(*counts[i].value_ptr, ld.counts.total));
1940 gtk_label_set(GTK_LABEL(counts[i].percent), label_str);
1943 /* do sync here, too */
1944 fflush(wtap_dump_file(ld.pdh));
1946 if (capture_child) {
1947 /* This is the child process for a sync mode capture, so send
1948 our parent a message saying we've written out "ld.sync_packets"
1949 packets to the capture file. */
1950 char tmp[DECISIZE+1+1];
1951 sprintf(tmp, "%d%c", ld.sync_packets, SP_PACKET_COUNT);
1952 write(1, tmp, strlen(tmp));
1955 ld.sync_packets = 0;
1959 if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1960 /* The specified capture time has elapsed; stop the capture. */
1962 } else if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
1963 /* time elasped for this ring file, swith to the next */
1964 if (ringbuf_switch_file(&cfile, &ld.pdh, &ld.err)) {
1965 /* File switch succeeded: reset the condition */
1966 cnd_reset(cnd_ring_timeout);
1968 /* File switch failed: stop here */
1974 } /* while (ld.go) */
1976 /* delete stop conditions */
1977 if (cnd_stop_capturesize != NULL)
1978 cnd_delete(cnd_stop_capturesize);
1979 if (cnd_stop_timeout != NULL)
1980 cnd_delete(cnd_stop_timeout);
1981 if (cnd_ring_timeout != NULL)
1982 cnd_delete(cnd_ring_timeout);
1985 snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
1987 popup_errmsg(errmsg);
1991 } else if (ld.from_pipe && ld.pipe_err == PIPERR)
1992 popup_errmsg(errmsg);
1998 get_capture_file_io_error(errmsg, sizeof(errmsg), cfile.save_file, ld.err,
2000 popup_errmsg(errmsg);
2004 if (capture_opts.ringbuffer_on) {
2005 close_ok = ringbuf_wtap_dump_close(&cfile, &err);
2007 close_ok = wtap_dump_close(ld.pdh, &err);
2009 /* If we've displayed a message about a write error, there's no point
2010 in displaying another message about an error on close. */
2011 if (!close_ok && write_ok) {
2012 get_capture_file_io_error(errmsg, sizeof(errmsg), cfile.save_file, err,
2014 popup_errmsg(errmsg);
2016 /* Set write_ok to mean the write and the close were successful. */
2017 write_ok = (write_ok && close_ok);
2021 * XXX We exhibit different behaviour between normal mode and sync mode
2022 * when the pipe is stdin and not already at EOF. If we're a child, the
2023 * parent's stdin isn't closed, so if the user starts another capture,
2024 * pipe_open_live() will very likely not see the expected magic bytes and
2025 * will say "Unrecognized libpcap format". On the other hand, in normal
2026 * mode, pipe_open_live() will say "End of file on pipe during open".
2028 if (ld.from_pipe && pipe_fd >= 0)
2033 /* Get the capture statistics, so we know how many packets were
2035 if (pcap_stats(pch, stats) >= 0) {
2036 *stats_known = TRUE;
2037 if (capture_child) {
2038 /* Let the parent process know. */
2039 char tmp[DECISIZE+1+1];
2040 sprintf(tmp, "%d%c", stats->ps_drop, SP_DROPS);
2041 write(1, tmp, strlen(tmp));
2044 snprintf(errmsg, sizeof(errmsg),
2045 "Can't get packet-drop statistics: %s",
2047 popup_errmsg(errmsg);
2053 /* Shut down windows sockets */
2057 gtk_grab_remove(GTK_WIDGET(cap_w));
2058 gtk_widget_destroy(GTK_WIDGET(cap_w));
2063 if (capture_opts.ringbuffer_on) {
2064 /* cleanup ringbuffer */
2065 ringbuf_error_cleanup();
2067 /* We can't use the save file, and we have no wtap_dump stream
2068 to close in order to close it, so close the FD directly. */
2069 close(cfile.save_file_fd);
2071 /* We couldn't even start the capture, so get rid of the capture
2073 unlink(cfile.save_file); /* silently ignore error */
2074 g_free(cfile.save_file);
2076 cfile.save_file = NULL;
2077 popup_errmsg(errmsg);
2094 get_capture_file_io_error(char *errmsg, int errmsglen, const char *fname,
2095 int err, gboolean is_close)
2100 snprintf(errmsg, errmsglen,
2101 "Not all the packets could be written to the file"
2102 " to which the capture was being saved\n"
2103 "(\"%s\") because there is no space left on the file system\n"
2104 "on which that file resides.",
2110 snprintf(errmsg, errmsglen,
2111 "Not all the packets could be written to the file"
2112 " to which the capture was being saved\n"
2113 "(\"%s\") because you are too close to, or over,"
2114 " your disk quota\n"
2115 "on the file system on which that file resides.",
2120 case WTAP_ERR_CANT_CLOSE:
2121 snprintf(errmsg, errmsglen,
2122 "The file to which the capture was being saved"
2123 " couldn't be closed for some unknown reason.");
2126 case WTAP_ERR_SHORT_WRITE:
2127 snprintf(errmsg, errmsglen,
2128 "Not all the packets could be written to the file"
2129 " to which the capture was being saved\n"
2136 snprintf(errmsg, errmsglen,
2137 "The file to which the capture was being saved\n"
2138 "(\"%s\") could not be closed: %s.",
2139 fname, wtap_strerror(err));
2141 snprintf(errmsg, errmsglen,
2142 "An error occurred while writing to the file"
2143 " to which the capture was being saved\n"
2145 fname, wtap_strerror(err));
2152 popup_errmsg(const char *errmsg)
2154 if (capture_child) {
2155 /* This is the child process for a sync mode capture.
2156 Send the error message to our parent, so they can display a
2157 dialog box containing it. */
2158 send_errmsg_to_parent(errmsg);
2160 /* Display the dialog box ourselves; there's no parent. */
2161 simple_dialog(ESD_TYPE_CRIT, NULL, "%s", errmsg);
2166 send_errmsg_to_parent(const char *errmsg)
2168 int msglen = strlen(errmsg);
2169 char lenbuf[DECISIZE+1+1];
2171 sprintf(lenbuf, "%u%c", msglen, SP_ERROR_MSG);
2172 write(1, lenbuf, strlen(lenbuf));
2173 write(1, errmsg, msglen);
2177 pct(gint num, gint denom) {
2179 return (float) num * 100.0 / (float) denom;
2186 stop_capture(int signo _U_)
2192 capture_delete_cb(GtkWidget *w _U_, GdkEvent *event _U_, gpointer data) {
2193 capture_stop_cb(NULL, data);
2197 capture_stop_cb(GtkWidget *w _U_, gpointer data) {
2198 loop_data *ld = (loop_data *) data;
2207 * XXX - find some way of signaling the child in Win32.
2210 if (fork_child != -1)
2211 kill(fork_child, SIGUSR1);
2216 kill_capture_child(void)
2219 * XXX - find some way of signaling the child in Win32.
2222 if (fork_child != -1)
2223 kill(fork_child, SIGTERM); /* SIGTERM so it can clean up if necessary */
2228 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
2231 struct wtap_pkthdr whdr;
2232 union wtap_pseudo_header pseudo_header;
2233 loop_data *ld = (loop_data *) user;
2236 if ((++ld->counts.total >= ld->max) && (ld->max > 0))
2241 /* Convert from libpcap to Wiretap format.
2242 If that fails, set "ld->go" to FALSE, to stop the capture, and set
2243 "ld->err" to the error. */
2244 pd = wtap_process_pcap_packet(ld->linktype, phdr, pd, &pseudo_header,
2253 /* We're supposed to write the packet to a file; do so.
2254 If this fails, set "ld->go" to FALSE, to stop the capture, and set
2255 "ld->err" to the error. */
2256 if (!wtap_dump(ld->pdh, &whdr, &pseudo_header, pd, &err)) {
2262 switch (ld->linktype) {
2263 case WTAP_ENCAP_ETHERNET:
2264 capture_eth(pd, 0, whdr.caplen, &ld->counts);
2266 case WTAP_ENCAP_FDDI:
2267 case WTAP_ENCAP_FDDI_BITSWAPPED:
2268 capture_fddi(pd, whdr.caplen, &ld->counts);
2270 case WTAP_ENCAP_PRISM_HEADER:
2271 capture_prism(pd, 0, whdr.caplen, &ld->counts);
2273 case WTAP_ENCAP_TOKEN_RING:
2274 capture_tr(pd, 0, whdr.caplen, &ld->counts);
2276 case WTAP_ENCAP_NULL:
2277 capture_null(pd, whdr.caplen, &ld->counts);
2279 case WTAP_ENCAP_PPP:
2280 capture_ppp_hdlc(pd, 0, whdr.caplen, &ld->counts);
2282 case WTAP_ENCAP_RAW_IP:
2283 capture_raw(pd, whdr.caplen, &ld->counts);
2285 case WTAP_ENCAP_SLL:
2286 capture_sll(pd, whdr.caplen, &ld->counts);
2288 case WTAP_ENCAP_LINUX_ATM_CLIP:
2289 capture_clip(pd, whdr.caplen, &ld->counts);
2291 case WTAP_ENCAP_IEEE_802_11:
2292 case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
2293 capture_ieee80211(pd, 0, whdr.caplen, &ld->counts);
2295 case WTAP_ENCAP_CHDLC:
2296 capture_chdlc(pd, 0, whdr.caplen, &ld->counts);
2298 case WTAP_ENCAP_LOCALTALK:
2299 capture_llap(&ld->counts);
2301 case WTAP_ENCAP_ATM_PDUS:
2302 capture_atm(&pseudo_header, pd, whdr.caplen, &ld->counts);
2304 case WTAP_ENCAP_IP_OVER_FC:
2305 capture_ipfc(pd, whdr.caplen, &ld->counts);
2307 case WTAP_ENCAP_ARCNET:
2308 capture_arcnet(pd, whdr.caplen, &ld->counts, FALSE, TRUE);
2310 case WTAP_ENCAP_ARCNET_LINUX:
2311 capture_arcnet(pd, whdr.caplen, &ld->counts, TRUE, FALSE);
2313 /* XXX - some ATM drivers on FreeBSD might prepend a 4-byte ATM
2314 pseudo-header to DLT_ATM_RFC1483, with LLC header following;
2315 we might have to implement that at some point. */
2319 #endif /* HAVE_LIBPCAP */