2 * Routines for packet capture windows
4 * $Id: capture.c,v 1.207 2003/05/15 13:33:53 deniel 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 wVersionRequested = MAKEWORD( 1, 1 );
1424 err = WSAStartup( wVersionRequested, &wsaData );
1426 snprintf(errmsg, sizeof errmsg,
1427 "Couldn't initialize Windows Sockets.");
1434 ld.counts.total = 0;
1435 if (capture_opts.has_autostop_count)
1436 ld.max = capture_opts.autostop_count;
1438 ld.max = 0; /* no limit */
1439 ld.err = 0; /* no error seen yet */
1440 ld.linktype = WTAP_ENCAP_UNKNOWN;
1441 ld.pcap_err = FALSE;
1442 ld.from_pipe = FALSE;
1443 ld.sync_packets = 0;
1451 ld.counts.netbios = 0;
1452 ld.counts.vines = 0;
1453 ld.counts.other = 0;
1457 /* We haven't yet gotten the capture statistics. */
1458 *stats_known = FALSE;
1460 /* Open the network interface to capture from it.
1461 Some versions of libpcap may put warnings into the error buffer
1462 if they succeed; to tell if that's happened, we have to clear
1463 the error buffer, and check if it's still a null string. */
1464 open_err_str[0] = '\0';
1465 pch = pcap_open_live(cfile.iface,
1466 capture_opts.has_snaplen ? capture_opts.snaplen :
1467 WTAP_MAX_PACKET_SIZE,
1468 capture_opts.promisc_mode, CAP_READ_TIMEOUT,
1472 /* We couldn't open "cfile.iface" as a network device. */
1474 /* On Windows, we don't support capturing on pipes, so we give up.
1475 If this is a child process that does the capturing in sync
1476 mode or fork mode, it shouldn't do any UI stuff until we pop up the
1477 capture-progress window, and, since we couldn't start the
1478 capture, we haven't popped it up. */
1479 if (!capture_child) {
1480 while (gtk_events_pending()) gtk_main_iteration();
1483 /* On Win32 OSes, the capture devices are probably available to all
1484 users; don't warn about permissions problems.
1486 Do, however, warn that WAN devices aren't supported. */
1487 snprintf(errmsg, sizeof errmsg,
1488 "The capture session could not be initiated (%s).\n"
1489 "Please check that you have the proper interface specified.\n"
1491 "Note that the driver Ethereal uses for packet capture on Windows doesn't\n"
1492 "support capturing on PPP/WAN interfaces in Windows NT/2000/XP/.NET Server.\n",
1496 /* try to open cfile.iface as a pipe */
1497 pipe_fd = pipe_open_live(cfile.iface, &hdr, &ld, errmsg, sizeof errmsg);
1499 if (pipe_fd == -1) {
1501 /* If this is a child process that does the capturing in sync
1502 * mode or fork mode, it shouldn't do any UI stuff until we pop up the
1503 * capture-progress window, and, since we couldn't start the
1504 * capture, we haven't popped it up.
1506 if (!capture_child) {
1507 while (gtk_events_pending()) gtk_main_iteration();
1510 if (ld.pipe_err == PIPNEXIST) {
1511 /* Pipe doesn't exist, so output message for interface */
1513 /* If we got a "can't find PPA for XXX" message, warn the user (who
1514 is running Ethereal on HP-UX) that they don't have a version
1515 of libpcap that properly handles HP-UX (libpcap 0.6.x and later
1516 versions, which properly handle HP-UX, say "can't find /dev/dlpi
1517 PPA for XXX" rather than "can't find PPA for XXX"). */
1518 if (strncmp(open_err_str, ppamsg, sizeof ppamsg - 1) == 0)
1521 "You are running Ethereal with a version of the libpcap library\n"
1522 "that doesn't handle HP-UX network devices well; this means that\n"
1523 "Ethereal may not be able to capture packets.\n"
1525 "To fix this, you should install libpcap 0.6.2, or a later version\n"
1526 "of libpcap, rather than libpcap 0.4 or 0.5.x. It is available in\n"
1527 "packaged binary form from the Software Porting And Archive Centre\n"
1528 "for HP-UX; the Centre is at http://hpux.connect.org.uk/ - the page\n"
1529 "at the URL lists a number of mirror sites.";
1532 snprintf(errmsg, sizeof errmsg,
1533 "The capture session could not be initiated (%s).\n"
1534 "Please check to make sure you have sufficient permissions, and that\n"
1535 "you have the proper interface or pipe specified.%s", open_err_str,
1539 * Else pipe (or file) does exist and pipe_open_live() has
1544 /* pipe_open_live() succeeded; don't want
1545 error message from pcap_open_live() */
1546 open_err_str[0] = '\0';
1550 /* capture filters only work on real interfaces */
1551 if (cfile.cfilter && !ld.from_pipe) {
1552 /* A capture filter was specified; set it up. */
1553 if (pcap_lookupnet(cfile.iface, &netnum, &netmask, lookup_net_err_str) < 0) {
1555 * Well, we can't get the netmask for this interface; it's used
1556 * only for filters that check for broadcast IP addresses, so
1557 * we just punt and use 0. It might be nice to warn the user,
1558 * but that's a pain in a GUI application, as it'd involve popping
1559 * up a message box, and it's not clear how often this would make
1560 * a difference (only filters that check for IP broadcast addresses
1565 if (pcap_compile(pch, &fcode, cfile.cfilter, 1, netmask) < 0) {
1566 snprintf(errmsg, sizeof errmsg, "Unable to parse filter string (%s).",
1570 if (pcap_setfilter(pch, &fcode) < 0) {
1571 snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
1577 /* Set up to write to the capture file. */
1580 pcap_encap = hdr.network;
1581 file_snaplen = hdr.snaplen;
1585 pcap_encap = get_pcap_linktype(pch, cfile.iface);
1586 file_snaplen = pcap_snapshot(pch);
1588 ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_encap);
1589 if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
1590 snprintf(errmsg, sizeof errmsg,
1591 "The network you're capturing from is of a type"
1592 " that Ethereal doesn't support (data link type %d).", pcap_encap);
1595 if (capture_opts.ringbuffer_on) {
1596 ld.pdh = ringbuf_init_wtap_dump_fdopen(WTAP_FILE_PCAP, ld.linktype,
1597 file_snaplen, &err);
1599 ld.pdh = wtap_dump_fdopen(cfile.save_file_fd, WTAP_FILE_PCAP,
1600 ld.linktype, file_snaplen, &err);
1603 if (ld.pdh == NULL) {
1604 /* We couldn't set up to write to the capture file. */
1607 case WTAP_ERR_CANT_OPEN:
1608 strcpy(errmsg, "The file to which the capture would be saved"
1609 " couldn't be created for some unknown reason.");
1612 case WTAP_ERR_SHORT_WRITE:
1613 strcpy(errmsg, "A full header couldn't be written to the file"
1614 " to which the capture would be saved.");
1619 snprintf(errmsg, sizeof(errmsg),
1620 "The file to which the capture would be"
1621 " saved (\"%s\") could not be opened: Error %d.",
1622 cfile.save_file, err);
1624 snprintf(errmsg, sizeof(errmsg),
1625 "The file to which the capture would be"
1626 " saved (\"%s\") could not be opened: %s.",
1627 cfile.save_file, strerror(err));
1634 /* Does "open_err_str" contain a non-empty string? If so, "pcap_open_live()"
1635 returned a warning; print it, but keep capturing. */
1636 if (open_err_str[0] != '\0')
1637 g_warning("%s.", open_err_str);
1639 /* XXX - capture SIGTERM and close the capture, in case we're on a
1640 Linux 2.0[.x] system and you have to explicitly close the capture
1641 stream in order to turn promiscuous mode off? We need to do that
1642 in other places as well - and I don't think that works all the
1643 time in any case, due to libpcap bugs. */
1645 if (capture_child) {
1646 /* Well, we should be able to start capturing.
1648 This is the child process for a sync mode capture, so sync out
1649 the capture file, so the header makes it to the file system,
1650 and send a "capture started successfully and capture file created"
1651 message to our parent so that they'll open the capture file and
1652 update its windows to indicate that we have a live capture in
1654 fflush(wtap_dump_file(ld.pdh));
1655 write(1, &capstart_msg, 1);
1658 cap_w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
1659 gtk_window_set_title(GTK_WINDOW(cap_w), "Ethereal: Capture");
1660 gtk_window_set_modal(GTK_WINDOW(cap_w), TRUE);
1662 /* Container for capture display widgets */
1663 main_vb = gtk_vbox_new(FALSE, 1);
1664 gtk_container_border_width(GTK_CONTAINER(main_vb), 5);
1665 gtk_container_add(GTK_CONTAINER(cap_w), main_vb);
1666 gtk_widget_show(main_vb);
1668 counts_fr = gtk_frame_new("Captured Frames");
1669 gtk_box_pack_start(GTK_BOX(main_vb), counts_fr, FALSE, FALSE, 3);
1670 gtk_widget_show(counts_fr);
1672 /* Individual statistic elements */
1673 counts_tb = gtk_table_new(N_COUNTS, 3, TRUE);
1674 gtk_container_add(GTK_CONTAINER(counts_fr), counts_tb);
1675 gtk_container_border_width(GTK_CONTAINER(counts_tb), 5);
1676 gtk_widget_show(counts_tb);
1678 for (i = 0; i < N_COUNTS; i++) {
1679 counts[i].label = gtk_label_new(counts[i].title);
1680 gtk_misc_set_alignment(GTK_MISC(counts[i].label), 0.0f, 0.0f);
1682 counts[i].value = gtk_label_new("0");
1683 gtk_misc_set_alignment(GTK_MISC(counts[i].value), 0.0f, 0.0f);
1685 counts[i].percent = gtk_label_new("0.0%");
1686 gtk_misc_set_alignment(GTK_MISC(counts[i].percent), 0.0f, 0.0f);
1688 gtk_table_attach_defaults(GTK_TABLE(counts_tb),
1689 counts[i].label, 0, 1, i, i + 1);
1691 gtk_table_attach(GTK_TABLE(counts_tb),
1693 1, 2, i, i + 1, 0, 0, 5, 0);
1695 gtk_table_attach_defaults(GTK_TABLE(counts_tb),
1696 counts[i].percent, 2, 3, i, i + 1);
1698 gtk_widget_show(counts[i].label);
1699 gtk_widget_show(counts[i].value);
1700 gtk_widget_show(counts[i].percent);
1704 running_tb = gtk_table_new(1, 3, TRUE);
1705 gtk_box_pack_start(GTK_BOX(main_vb), running_tb, FALSE, FALSE, 3);
1706 gtk_widget_show(running_tb);
1708 running_label = gtk_label_new("Running");
1709 gtk_misc_set_alignment(GTK_MISC(running_label), 0.0f, 0.0f);
1710 gtk_widget_show(running_label);
1711 gtk_table_attach_defaults(GTK_TABLE(running_tb),
1712 running_label, 0, 1, 0, 1);
1714 running_time = gtk_label_new("00:00:00");
1715 gtk_misc_set_alignment(GTK_MISC(running_time), 0.0f, 0.0f);
1716 gtk_widget_show(running_time);
1717 gtk_table_attach(GTK_TABLE(running_tb),
1719 1, 2, 0, 1, 0, 0, 5, 0);
1721 /* allow user to either click a stop button, or the close button on
1722 the window to stop a capture in progress. */
1723 stop_bt = gtk_button_new_with_label ("Stop");
1724 gtk_signal_connect(GTK_OBJECT(stop_bt), "clicked",
1725 GTK_SIGNAL_FUNC(capture_stop_cb), (gpointer) &ld);
1726 gtk_signal_connect(GTK_OBJECT(cap_w), "delete_event",
1727 GTK_SIGNAL_FUNC(capture_delete_cb), (gpointer) &ld);
1728 gtk_box_pack_start(GTK_BOX(main_vb), stop_bt, FALSE, FALSE, 3);
1729 GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
1730 gtk_widget_grab_default(stop_bt);
1731 GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
1732 gtk_widget_grab_default(stop_bt);
1733 gtk_widget_show(stop_bt);
1735 gtk_widget_show(cap_w);
1737 start_time = time(NULL);
1738 upd_time = time(NULL);
1739 #ifdef MUST_DO_SELECT
1740 if (!ld.from_pipe) pcap_fd = pcap_fileno(pch);
1745 * Catch SIGUSR1, so that we exit cleanly if the parent process
1746 * kills us with it due to the user selecting "Capture->Stop".
1749 signal(SIGUSR1, stop_capture);
1751 /* initialize capture stop conditions */
1752 init_capture_stop_conditions();
1753 /* create stop conditions */
1754 if (capture_opts.has_autostop_filesize)
1755 cnd_stop_capturesize =
1756 cnd_new(CND_CLASS_CAPTURESIZE,(long)capture_opts.autostop_filesize * 1000);
1757 if (capture_opts.has_autostop_duration)
1759 cnd_new(CND_CLASS_TIMEOUT,(gint32)capture_opts.autostop_duration);
1761 if (capture_opts.ringbuffer_on && capture_opts.has_ring_duration)
1763 cnd_new(CND_CLASS_TIMEOUT, capture_opts.ringbuffer_duration);
1766 while (gtk_events_pending()) gtk_main_iteration();
1771 FD_SET(pipe_fd, &set1);
1773 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
1774 sel_ret = select(pipe_fd+1, &set1, NULL, NULL, &timeout);
1777 if (sel_ret < 0 && errno != EINTR) {
1778 snprintf(errmsg, sizeof(errmsg),
1779 "Unexpected error from select: %s", strerror(errno));
1780 popup_errmsg(errmsg);
1785 * "select()" says we can read from the pipe without blocking
1787 inpkts = pipe_dispatch(pipe_fd, &ld, &hdr, &rechdr, pcap_data,
1788 errmsg, sizeof errmsg);
1797 #ifdef MUST_DO_SELECT
1799 * Sigh. The semantics of the read timeout argument to
1800 * "pcap_open_live()" aren't particularly well specified by
1801 * the "pcap" man page - at least with the BSD BPF code, the
1802 * intent appears to be, at least in part, a way of cutting
1803 * down the number of reads done on a capture, by blocking
1804 * until the buffer fills or a timer expires - and the Linux
1805 * libpcap doesn't actually support it, so we can't use it
1806 * to break out of the "pcap_dispatch()" every 1/4 of a second
1807 * or so. Linux's libpcap is not the only libpcap that doesn't
1808 * support the read timeout.
1810 * Furthermore, at least on Solaris, the bufmod STREAMS module's
1811 * read timeout won't go off if no data has arrived, i.e. it cannot
1812 * be used to guarantee that a read from a DLPI stream will return
1813 * within a specified amount of time regardless of whether any
1814 * data arrives or not.
1816 * Thus, on all platforms other than BSD, we do a "select()" on the
1817 * file descriptor for the capture, with a timeout of CAP_READ_TIMEOUT
1818 * milliseconds, or CAP_READ_TIMEOUT*1000 microseconds.
1820 * "select()", on BPF devices, doesn't work as you might expect;
1821 * at least on some versions of some flavors of BSD, the timer
1822 * doesn't start until a read is done, so it won't expire if
1823 * only a "select()" or "poll()" is posted.
1826 FD_SET(pcap_fd, &set1);
1828 timeout.tv_usec = CAP_READ_TIMEOUT*1000;
1829 sel_ret = select(pcap_fd+1, &set1, NULL, NULL, &timeout);
1832 * "select()" says we can read from it without blocking; go for
1835 inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (guchar *) &ld);
1842 if (sel_ret < 0 && errno != EINTR) {
1843 snprintf(errmsg, sizeof(errmsg),
1844 "Unexpected error from select: %s", strerror(errno));
1845 popup_errmsg(errmsg);
1850 inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (guchar *) &ld);
1859 ld.sync_packets += inpkts;
1860 /* check capture stop conditons */
1861 if (cnd_stop_capturesize != NULL && cnd_eval(cnd_stop_capturesize,
1862 (guint32)wtap_get_bytes_dumped(ld.pdh))){
1863 /* Capture file reached its maximum size. */
1864 if (capture_opts.ringbuffer_on) {
1865 /* Switch to the next ringbuffer file */
1866 if (ringbuf_switch_file(&cfile, &ld.pdh, &ld.err)) {
1867 /* File switch succeeded: reset the condition */
1868 cnd_reset(cnd_stop_capturesize);
1869 if (cnd_ring_timeout) {
1870 cnd_reset(cnd_ring_timeout);
1873 /* File switch failed: stop here */
1878 /* no ringbuffer - just stop */
1884 /* Only update once a second so as not to overload slow displays */
1885 cur_time = time(NULL);
1886 if (cur_time > upd_time) {
1887 upd_time = cur_time;
1889 /* calculate and display running time */
1890 cur_time -= start_time;
1891 snprintf(label_str, sizeof(label_str), "%02ld:%02ld:%02ld",
1892 (long)(cur_time/3600), (long)((cur_time%3600)/60),
1893 (long)(cur_time%60));
1894 gtk_label_set(GTK_LABEL(running_time), label_str);
1896 if (ld.sync_packets) {
1898 for (i = 0; i < N_COUNTS; i++) {
1899 snprintf(label_str, sizeof(label_str), "%d",
1900 *counts[i].value_ptr);
1902 gtk_label_set(GTK_LABEL(counts[i].value), label_str);
1904 snprintf(label_str, sizeof(label_str), "(%.1f%%)",
1905 pct(*counts[i].value_ptr, ld.counts.total));
1907 gtk_label_set(GTK_LABEL(counts[i].percent), label_str);
1910 /* do sync here, too */
1911 fflush(wtap_dump_file(ld.pdh));
1913 if (capture_child) {
1914 /* This is the child process for a sync mode capture, so send
1915 our parent a message saying we've written out "ld.sync_packets"
1916 packets to the capture file. */
1917 char tmp[DECISIZE+1+1];
1918 sprintf(tmp, "%d%c", ld.sync_packets, SP_PACKET_COUNT);
1919 write(1, tmp, strlen(tmp));
1922 ld.sync_packets = 0;
1926 if (cnd_stop_timeout != NULL && cnd_eval(cnd_stop_timeout)) {
1927 /* The specified capture time has elapsed; stop the capture. */
1929 } else if (cnd_ring_timeout != NULL && cnd_eval(cnd_ring_timeout)) {
1930 /* time elasped for this ring file, swith to the next */
1931 if (ringbuf_switch_file(&cfile, &ld.pdh, &ld.err)) {
1932 /* File switch succeeded: reset the condition */
1933 cnd_reset(cnd_ring_timeout);
1935 /* File switch failed: stop here */
1941 } /* while (ld.go) */
1943 /* delete stop conditions */
1944 if (cnd_stop_capturesize != NULL)
1945 cnd_delete(cnd_stop_capturesize);
1946 if (cnd_stop_timeout != NULL)
1947 cnd_delete(cnd_stop_timeout);
1948 if (cnd_ring_timeout != NULL)
1949 cnd_delete(cnd_ring_timeout);
1952 snprintf(errmsg, sizeof(errmsg), "Error while capturing packets: %s",
1954 popup_errmsg(errmsg);
1958 } else if (ld.from_pipe && ld.pipe_err == PIPERR)
1959 popup_errmsg(errmsg);
1965 get_capture_file_io_error(errmsg, sizeof(errmsg), cfile.save_file, ld.err,
1967 popup_errmsg(errmsg);
1971 if (capture_opts.ringbuffer_on) {
1972 close_ok = ringbuf_wtap_dump_close(&cfile, &err);
1974 close_ok = wtap_dump_close(ld.pdh, &err);
1976 /* If we've displayed a message about a write error, there's no point
1977 in displaying another message about an error on close. */
1978 if (!close_ok && write_ok) {
1979 get_capture_file_io_error(errmsg, sizeof(errmsg), cfile.save_file, err,
1981 popup_errmsg(errmsg);
1983 /* Set write_ok to mean the write and the close were successful. */
1984 write_ok = (write_ok && close_ok);
1988 * XXX We exhibit different behaviour between normal mode and sync mode
1989 * when the pipe is stdin and not already at EOF. If we're a child, the
1990 * parent's stdin isn't closed, so if the user starts another capture,
1991 * pipe_open_live() will very likely not see the expected magic bytes and
1992 * will say "Unrecognized libpcap format". On the other hand, in normal
1993 * mode, pipe_open_live() will say "End of file on pipe during open".
1995 if (ld.from_pipe && pipe_fd >= 0)
2000 /* Get the capture statistics, so we know how many packets were
2002 if (pcap_stats(pch, stats) >= 0) {
2003 *stats_known = TRUE;
2004 if (capture_child) {
2005 /* Let the parent process know. */
2006 char tmp[DECISIZE+1+1];
2007 sprintf(tmp, "%d%c", stats->ps_drop, SP_DROPS);
2008 write(1, tmp, strlen(tmp));
2011 snprintf(errmsg, sizeof(errmsg),
2012 "Can't get packet-drop statistics: %s",
2014 popup_errmsg(errmsg);
2020 /* Shut down windows sockets */
2024 gtk_grab_remove(GTK_WIDGET(cap_w));
2025 gtk_widget_destroy(GTK_WIDGET(cap_w));
2030 if (capture_opts.ringbuffer_on) {
2031 /* cleanup ringbuffer */
2032 ringbuf_error_cleanup();
2034 /* We can't use the save file, and we have no wtap_dump stream
2035 to close in order to close it, so close the FD directly. */
2036 close(cfile.save_file_fd);
2038 /* We couldn't even start the capture, so get rid of the capture
2040 unlink(cfile.save_file); /* silently ignore error */
2041 g_free(cfile.save_file);
2043 cfile.save_file = NULL;
2044 popup_errmsg(errmsg);
2061 get_capture_file_io_error(char *errmsg, int errmsglen, const char *fname,
2062 int err, gboolean is_close)
2067 snprintf(errmsg, errmsglen,
2068 "Not all the packets could be written to the file"
2069 " to which the capture was being saved\n"
2070 "(\"%s\") because there is no space left on the file system\n"
2071 "on which that file resides.",
2077 snprintf(errmsg, errmsglen,
2078 "Not all the packets could be written to the file"
2079 " to which the capture was being saved\n"
2080 "(\"%s\") because you are too close to, or over,"
2081 " your disk quota\n"
2082 "on the file system on which that file resides.",
2087 case WTAP_ERR_CANT_CLOSE:
2088 snprintf(errmsg, errmsglen,
2089 "The file to which the capture was being saved"
2090 " couldn't be closed for some unknown reason.");
2093 case WTAP_ERR_SHORT_WRITE:
2094 snprintf(errmsg, errmsglen,
2095 "Not all the packets could be written to the file"
2096 " to which the capture was being saved\n"
2103 snprintf(errmsg, errmsglen,
2104 "The file to which the capture was being saved\n"
2105 "(\"%s\") could not be closed: %s.",
2106 fname, wtap_strerror(err));
2108 snprintf(errmsg, errmsglen,
2109 "An error occurred while writing to the file"
2110 " to which the capture was being saved\n"
2112 fname, wtap_strerror(err));
2119 popup_errmsg(const char *errmsg)
2121 if (capture_child) {
2122 /* This is the child process for a sync mode capture.
2123 Send the error message to our parent, so they can display a
2124 dialog box containing it. */
2125 send_errmsg_to_parent(errmsg);
2127 /* Display the dialog box ourselves; there's no parent. */
2128 simple_dialog(ESD_TYPE_CRIT, NULL, "%s", errmsg);
2133 send_errmsg_to_parent(const char *errmsg)
2135 int msglen = strlen(errmsg);
2136 char lenbuf[DECISIZE+1+1];
2138 sprintf(lenbuf, "%u%c", msglen, SP_ERROR_MSG);
2139 write(1, lenbuf, strlen(lenbuf));
2140 write(1, errmsg, msglen);
2144 pct(gint num, gint denom) {
2146 return (float) num * 100.0 / (float) denom;
2153 stop_capture(int signo _U_)
2159 capture_delete_cb(GtkWidget *w _U_, GdkEvent *event _U_, gpointer data) {
2160 capture_stop_cb(NULL, data);
2164 capture_stop_cb(GtkWidget *w _U_, gpointer data) {
2165 loop_data *ld = (loop_data *) data;
2174 * XXX - find some way of signaling the child in Win32.
2177 if (fork_child != -1)
2178 kill(fork_child, SIGUSR1);
2183 kill_capture_child(void)
2186 * XXX - find some way of signaling the child in Win32.
2189 if (fork_child != -1)
2190 kill(fork_child, SIGTERM); /* SIGTERM so it can clean up if necessary */
2195 capture_pcap_cb(guchar *user, const struct pcap_pkthdr *phdr,
2198 struct wtap_pkthdr whdr;
2199 union wtap_pseudo_header pseudo_header;
2200 loop_data *ld = (loop_data *) user;
2203 if ((++ld->counts.total >= ld->max) && (ld->max > 0))
2208 /* Convert from libpcap to Wiretap format.
2209 If that fails, set "ld->go" to FALSE, to stop the capture, and set
2210 "ld->err" to the error. */
2211 pd = wtap_process_pcap_packet(ld->linktype, phdr, pd, &pseudo_header,
2220 /* We're supposed to write the packet to a file; do so.
2221 If this fails, set "ld->go" to FALSE, to stop the capture, and set
2222 "ld->err" to the error. */
2223 if (!wtap_dump(ld->pdh, &whdr, &pseudo_header, pd, &err)) {
2229 switch (ld->linktype) {
2230 case WTAP_ENCAP_ETHERNET:
2231 capture_eth(pd, 0, whdr.caplen, &ld->counts);
2233 case WTAP_ENCAP_FDDI:
2234 case WTAP_ENCAP_FDDI_BITSWAPPED:
2235 capture_fddi(pd, whdr.caplen, &ld->counts);
2237 case WTAP_ENCAP_PRISM_HEADER:
2238 capture_prism(pd, 0, whdr.caplen, &ld->counts);
2240 case WTAP_ENCAP_TOKEN_RING:
2241 capture_tr(pd, 0, whdr.caplen, &ld->counts);
2243 case WTAP_ENCAP_NULL:
2244 capture_null(pd, whdr.caplen, &ld->counts);
2246 case WTAP_ENCAP_PPP:
2247 capture_ppp_hdlc(pd, 0, whdr.caplen, &ld->counts);
2249 case WTAP_ENCAP_RAW_IP:
2250 capture_raw(pd, whdr.caplen, &ld->counts);
2252 case WTAP_ENCAP_SLL:
2253 capture_sll(pd, whdr.caplen, &ld->counts);
2255 case WTAP_ENCAP_LINUX_ATM_CLIP:
2256 capture_clip(pd, whdr.caplen, &ld->counts);
2258 case WTAP_ENCAP_IEEE_802_11:
2259 case WTAP_ENCAP_IEEE_802_11_WITH_RADIO:
2260 capture_ieee80211(pd, 0, whdr.caplen, &ld->counts);
2262 case WTAP_ENCAP_CHDLC:
2263 capture_chdlc(pd, 0, whdr.caplen, &ld->counts);
2265 case WTAP_ENCAP_LOCALTALK:
2266 capture_llap(&ld->counts);
2268 case WTAP_ENCAP_ATM_PDUS:
2269 capture_atm(&pseudo_header, pd, whdr.caplen, &ld->counts);
2271 case WTAP_ENCAP_IP_OVER_FC:
2272 capture_ipfc(pd, whdr.caplen, &ld->counts);
2274 case WTAP_ENCAP_ARCNET:
2275 capture_arcnet(pd, whdr.caplen, &ld->counts, FALSE, TRUE);
2277 case WTAP_ENCAP_ARCNET_LINUX:
2278 capture_arcnet(pd, whdr.caplen, &ld->counts, TRUE, FALSE);
2280 /* XXX - some ATM drivers on FreeBSD might prepend a 4-byte ATM
2281 pseudo-header to DLT_ATM_RFC1483, with LLC header following;
2282 we might have to implement that at some point. */
2286 #endif /* HAVE_LIBPCAP */