949 lines
27 KiB
C
949 lines
27 KiB
C
/* capture.c
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* Routines for packet capture windows
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*
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* $Id: capture.c,v 1.99 2000/03/21 06:51:58 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_LIBPCAP
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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# include <sys/wait.h>
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#endif
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#ifdef HAVE_IO_H
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#include <io.h>
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#endif
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#include <gtk/gtk.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <fcntl.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <time.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#include <signal.h>
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#include <errno.h>
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#ifdef NEED_SNPRINTF_H
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# ifdef HAVE_STDARG_H
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# include <stdarg.h>
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# else
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# include <varargs.h>
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# endif
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# include "snprintf.h"
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#endif
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#ifndef lib_pcap_h
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#include <pcap.h>
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#endif
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#include "gtk/main.h"
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#include "gtk/gtkglobals.h"
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#include "packet.h"
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#include "file.h"
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#include "capture.h"
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#include "util.h"
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#include "simple_dialog.h"
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#include "prefs.h"
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#include "globals.h"
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#include "packet-eth.h"
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#include "packet-fddi.h"
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#include "packet-null.h"
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#include "packet-ppp.h"
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#include "packet-raw.h"
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#include "packet-tr.h"
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int sync_mode; /* fork a child to do the capture, and sync between them */
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static int sync_pipe[2]; /* used to sync father */
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int quit_after_cap; /* Makes a "capture only mode". Implies -k */
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gboolean capture_child; /* if this is the child for "-S" */
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static guint cap_input_id;
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static void cap_file_input_cb(gpointer, gint, GdkInputCondition);
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static void capture_delete_cb(GtkWidget *, GdkEvent *, gpointer);
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static void capture_stop_cb(GtkWidget *, gpointer);
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static void capture_pcap_cb(u_char *, const struct pcap_pkthdr *,
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const u_char *);
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static float pct(gint, gint);
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typedef struct _loop_data {
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gint go;
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gint max;
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gint linktype;
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gint sync_packets;
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packet_counts counts;
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wtap_dumper *pdh;
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} loop_data;
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/* Win32 needs the O_BINARY flag for open() */
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/* Open a specified file, or create a temporary file, and start a capture
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to the file in question. */
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void
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do_capture(char *capfile_name)
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{
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char tmpname[128+1];
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gboolean is_tempfile;
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u_char c;
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int i;
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guint byte_count;
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char *msg;
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int err;
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int capture_succeeded;
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if (capfile_name != NULL) {
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/* Try to open/create the specified file for use as a capture buffer. */
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cf.save_file_fd = open(capfile_name, O_RDWR|O_BINARY|O_TRUNC|O_CREAT, 0600);
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is_tempfile = FALSE;
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} else {
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/* Choose a random name for the capture buffer */
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cf.save_file_fd = create_tempfile(tmpname, sizeof tmpname, "ether");
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capfile_name = g_strdup(tmpname);
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is_tempfile = TRUE;
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}
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if (cf.save_file_fd == -1) {
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simple_dialog(ESD_TYPE_WARN, NULL,
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"The file to which the capture would be saved (\"%s\")"
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"could not be opened: %s.", capfile_name, strerror(errno));
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return;
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}
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close_cap_file(&cf, info_bar);
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g_assert(cf.save_file == NULL);
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cf.save_file = capfile_name;
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if (sync_mode) { /* use fork() for capture */
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#ifndef _WIN32
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int fork_child;
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char ssnap[24];
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char scount[24]; /* need a constant for len of numbers */
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char save_file_fd[24];
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sprintf(ssnap,"%d",cf.snap); /* in lieu of itoa */
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sprintf(scount,"%d",cf.count);
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sprintf(save_file_fd,"%d",cf.save_file_fd);
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signal(SIGCHLD, SIG_IGN);
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pipe(sync_pipe);
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if ((fork_child = fork()) == 0) {
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/*
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* Child process - run Ethereal with the right arguments to make
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* it just pop up the live capture dialog box and capture with
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* the specified capture parameters, writing to the specified file.
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*
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* args: -i interface specification
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* -w file to write
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* -W file descriptor to write
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* -c count to capture
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* -s snaplen
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* -m / -b fonts
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* -f "filter expression"
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*/
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close(1);
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dup(sync_pipe[1]);
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close(sync_pipe[0]);
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execlp(ethereal_path, CHILD_NAME, "-i", cf.iface,
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"-w", cf.save_file, "-W", save_file_fd,
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"-c", scount, "-s", ssnap,
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"-m", medium_font, "-b", bold_font,
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(cf.cfilter == NULL)? 0 : "-f",
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(cf.cfilter == NULL)? 0 : cf.cfilter,
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(const char *)NULL);
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} else {
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/* Parent process - read messages from the child process over the
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sync pipe. */
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close(sync_pipe[1]);
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/* Read a byte count from "sync_pipe[0]", terminated with a
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colon; if the count is 0, the child process created the
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capture file and we should start reading from it, otherwise
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the capture couldn't start and the count is a count of bytes
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of error message, and we should display the message. */
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byte_count = 0;
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for (;;) {
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i = read(sync_pipe[0], &c, 1);
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if (i == 0) {
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/* EOF - the child process died.
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Close the read side of the sync pipe, remove the capture file,
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and report the failure.
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XXX - reap the child process and report the status in detail. */
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close(sync_pipe[0]);
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unlink(cf.save_file);
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g_free(cf.save_file);
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cf.save_file = NULL;
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simple_dialog(ESD_TYPE_WARN, NULL, "Capture child process died");
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return;
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}
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if (c == ';')
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break;
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if (!isdigit(c)) {
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/* Child process handed us crap.
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Close the read side of the sync pipe, remove the capture file,
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and report the failure. */
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close(sync_pipe[0]);
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unlink(cf.save_file);
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g_free(cf.save_file);
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cf.save_file = NULL;
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simple_dialog(ESD_TYPE_WARN, NULL,
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"Capture child process sent us a bad message");
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return;
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}
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byte_count = byte_count*10 + c - '0';
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}
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if (byte_count == 0) {
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/* Success. Open the capture file, and set up to read it. */
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err = start_tail_cap_file(cf.save_file, is_tempfile, &cf);
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if (err == 0) {
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/* We were able to open and set up to read the capture file;
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arrange that our callback be called whenever it's possible
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to read from the sync pipe, so that it's called when
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the child process wants to tell us something. */
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cap_input_id = gtk_input_add_full(sync_pipe[0],
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GDK_INPUT_READ|GDK_INPUT_EXCEPTION,
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cap_file_input_cb,
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NULL,
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(gpointer) &cf,
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NULL);
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} else {
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/* We weren't able to open the capture file; complain, and
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close the sync pipe. */
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simple_dialog(ESD_TYPE_WARN, NULL,
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file_open_error_message(err, FALSE), cf.save_file);
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/* Close the sync pipe. */
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close(sync_pipe[0]);
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/* Don't unlink the save file - leave it around, for debugging
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purposes. */
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g_free(cf.save_file);
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cf.save_file = NULL;
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}
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} else {
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/* Failure - the child process sent us a message indicating
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what the problem was. */
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msg = g_malloc(byte_count + 1);
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if (msg == NULL) {
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simple_dialog(ESD_TYPE_WARN, NULL,
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"Capture child process failed, but its error message was too big.");
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} else {
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i = read(sync_pipe[0], msg, byte_count);
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if (i < 0) {
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simple_dialog(ESD_TYPE_WARN, NULL,
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"Capture child process failed: Error %s reading its error message.",
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strerror(errno));
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} else if (i == 0) {
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simple_dialog(ESD_TYPE_WARN, NULL,
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"Capture child process failed: EOF reading its error message.");
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} else
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simple_dialog(ESD_TYPE_WARN, NULL, msg);
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g_free(msg);
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/* Close the sync pipe. */
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close(sync_pipe[0]);
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/* Get rid of the save file - the capture never started. */
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unlink(cf.save_file);
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g_free(cf.save_file);
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cf.save_file = NULL;
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}
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}
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}
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#endif
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} else {
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/* Not sync mode. */
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capture_succeeded = capture();
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if (quit_after_cap) {
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/* DON'T unlink the save file. Presumably someone wants it. */
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gtk_exit(0);
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}
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if (capture_succeeded) {
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/* Capture succeeded; read in the capture file. */
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if ((err = open_cap_file(cf.save_file, is_tempfile, &cf)) == 0) {
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/* Set the read filter to NULL. */
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cf.rfcode = NULL;
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err = read_cap_file(&cf);
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}
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}
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/* We're not doing a capture any more, so we don't have a save
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file. */
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g_free(cf.save_file);
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cf.save_file = NULL;
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}
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}
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#ifndef _WIN32
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/* There's stuff to read from the sync pipe, meaning the child has sent
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us a message, or the sync pipe has closed, meaning the child has
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closed it (perhaps because it exited). */
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static void
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cap_file_input_cb(gpointer data, gint source, GdkInputCondition condition)
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{
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capture_file *cf = (capture_file *)data;
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char buffer[256+1], *p = buffer, *q = buffer;
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int nread;
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int to_read = 0;
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gboolean exit_loop = FALSE;
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int err;
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int wstatus;
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int wsignal;
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char *msg;
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char *sigmsg;
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char sigmsg_buf[6+1+3+1];
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char *coredumped;
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/* avoid reentrancy problems and stack overflow */
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gtk_input_remove(cap_input_id);
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if ((nread = read(sync_pipe[0], buffer, 256)) <= 0) {
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/* The child has closed the sync pipe, meaning it's not going to be
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capturing any more packets. Pick up its exit status, and
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complain if it died of a signal. */
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if (wait(&wstatus) != -1) {
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/* XXX - are there any platforms on which we can run that *don't*
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support POSIX.1's <sys/wait.h> and macros therein? */
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wsignal = wstatus & 0177;
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coredumped = "";
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if (wstatus == 0177) {
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/* It stopped, rather than exiting. "Should not happen." */
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msg = "stopped";
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wsignal = (wstatus >> 8) & 0xFF;
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} else {
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msg = "terminated";
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if (wstatus & 0200)
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coredumped = " - core dumped";
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}
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if (wsignal != 0) {
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switch (wsignal) {
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case SIGHUP:
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sigmsg = "Hangup";
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break;
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case SIGINT:
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sigmsg = "Interrupted";
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break;
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case SIGQUIT:
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sigmsg = "Quit";
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break;
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case SIGILL:
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sigmsg = "Illegal instruction";
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break;
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case SIGTRAP:
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sigmsg = "Trace trap";
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break;
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case SIGABRT:
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sigmsg = "Abort";
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break;
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case SIGFPE:
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sigmsg = "Arithmetic exception";
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break;
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case SIGKILL:
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sigmsg = "Killed";
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break;
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case SIGBUS:
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sigmsg = "Bus error";
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break;
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case SIGSEGV:
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sigmsg = "Segmentation violation";
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break;
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/* http://metalab.unc.edu/pub/Linux/docs/HOWTO/GCC-HOWTO
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Linux is POSIX compliant. These are not POSIX-defined signals ---
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ISO/IEC 9945-1:1990 (IEEE Std 1003.1-1990), paragraph B.3.3.1.1 sez:
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``The signals SIGBUS, SIGEMT, SIGIOT, SIGTRAP, and SIGSYS
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were omitted from POSIX.1 because their behavior is
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implementation dependent and could not be adequately catego-
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rized. Conforming implementations may deliver these sig-
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nals, but must document the circumstances under which they
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are delivered and note any restrictions concerning their
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delivery.''
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*/
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#ifdef SIGSYS
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case SIGSYS:
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sigmsg = "Bad system call";
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break;
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#endif
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case SIGPIPE:
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sigmsg = "Broken pipe";
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break;
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case SIGALRM:
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sigmsg = "Alarm clock";
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break;
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case SIGTERM:
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sigmsg = "Terminated";
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break;
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default:
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sprintf(sigmsg_buf, "Signal %d", wsignal);
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sigmsg = sigmsg_buf;
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break;
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}
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simple_dialog(ESD_TYPE_WARN, NULL,
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"Child capture process %s: %s%s", msg, sigmsg, coredumped);
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}
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}
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|
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/* Read what remains of the capture file, and finish the capture.
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XXX - do something if this fails? */
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err = finish_tail_cap_file(cf);
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/* We're not doing a capture any more, so we don't have a save
|
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file. */
|
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g_free(cf->save_file);
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cf->save_file = NULL;
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return;
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}
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buffer[nread] = '\0';
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|
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while(!exit_loop) {
|
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/* look for (possibly multiple) '*' */
|
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switch (*q) {
|
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case '*' :
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to_read += atoi(p);
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p = q + 1;
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q++;
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break;
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case '\0' :
|
|
/* XXX should handle the case of a pipe full (i.e. no star found) */
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exit_loop = TRUE;
|
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break;
|
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default :
|
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q++;
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break;
|
|
}
|
|
}
|
|
|
|
/* Read from the capture file the number of records the child told us
|
|
it added.
|
|
XXX - do something if this fails? */
|
|
err = continue_tail_cap_file(cf, to_read);
|
|
|
|
/* restore pipe handler */
|
|
cap_input_id = gtk_input_add_full (sync_pipe[0],
|
|
GDK_INPUT_READ|GDK_INPUT_EXCEPTION,
|
|
cap_file_input_cb,
|
|
NULL,
|
|
(gpointer) cf,
|
|
NULL);
|
|
}
|
|
#endif /* _WIN32 */
|
|
|
|
/*
|
|
* Timeout, in milliseconds, for reads from the stream of captured packets.
|
|
*/
|
|
#define CAP_READ_TIMEOUT 250
|
|
|
|
/* Do the low-level work of a capture.
|
|
Returns TRUE if it succeeds, FALSE otherwise. */
|
|
int
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capture(void)
|
|
{
|
|
GtkWidget *cap_w, *main_vb, *count_lb, *tcp_lb, *udp_lb, *icmp_lb,
|
|
*ospf_lb, *gre_lb, *netbios_lb, *ipx_lb, *vines_lb, *other_lb, *stop_bt;
|
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pcap_t *pch;
|
|
gchar err_str[PCAP_ERRBUF_SIZE], label_str[32];
|
|
loop_data ld;
|
|
bpf_u_int32 netnum, netmask;
|
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time_t upd_time, cur_time;
|
|
int err, inpkts;
|
|
char errmsg[1024+1];
|
|
#ifdef linux
|
|
fd_set set1;
|
|
struct timeval timeout;
|
|
int pcap_fd;
|
|
#endif
|
|
#ifdef _WIN32
|
|
WORD wVersionRequested;
|
|
WSADATA wsaData;
|
|
#endif
|
|
|
|
/* Initialize Windows Socket if we are in a WIN32 OS
|
|
This needs to be done before querying the interface for network/netmask */
|
|
#ifdef _WIN32
|
|
wVersionRequested = MAKEWORD( 1, 1 );
|
|
err = WSAStartup( wVersionRequested, &wsaData );
|
|
if (err!=0) {
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"Couldn't initialize Windows Sockets.");
|
|
pch=NULL;
|
|
goto error;
|
|
}
|
|
#endif
|
|
|
|
ld.go = TRUE;
|
|
ld.counts.total = 0;
|
|
ld.max = cf.count;
|
|
ld.linktype = WTAP_ENCAP_UNKNOWN;
|
|
ld.sync_packets = 0;
|
|
ld.counts.tcp = 0;
|
|
ld.counts.udp = 0;
|
|
ld.counts.icmp = 0;
|
|
ld.counts.ospf = 0;
|
|
ld.counts.gre = 0;
|
|
ld.counts.ipx = 0;
|
|
ld.counts.netbios = 0;
|
|
ld.counts.vines = 0;
|
|
ld.counts.other = 0;
|
|
ld.pdh = NULL;
|
|
|
|
/* Open the network interface to capture from it. */
|
|
pch = pcap_open_live(cf.iface, cf.snap, 1, CAP_READ_TIMEOUT, err_str);
|
|
|
|
if (pch == NULL) {
|
|
/* Well, we couldn't start the capture.
|
|
If this is a child process that does the capturing in sync
|
|
mode or fork mode, it shouldn't do any UI stuff until we pop up the
|
|
capture-progress window, and, since we couldn't start the
|
|
capture, we haven't popped it up. */
|
|
if (!capture_child) {
|
|
while (gtk_events_pending()) gtk_main_iteration();
|
|
}
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"The capture session could not be initiated (%s).\n"
|
|
"Please check to make sure you have sufficient permissions, and that\n"
|
|
"you have the proper interface specified.", err_str);
|
|
goto error;
|
|
}
|
|
|
|
if (cf.cfilter) {
|
|
/* A capture filter was specified; set it up. */
|
|
if (pcap_lookupnet (cf.iface, &netnum, &netmask, err_str) < 0) {
|
|
snprintf(errmsg, sizeof errmsg,
|
|
"Can't use filter: Couldn't obtain netmask info (%s).", err_str);
|
|
goto error;
|
|
}
|
|
if (pcap_compile(pch, &cf.fcode, cf.cfilter, 1, netmask) < 0) {
|
|
snprintf(errmsg, sizeof errmsg, "Unable to parse filter string (%s).",
|
|
pcap_geterr(pch));
|
|
goto error;
|
|
}
|
|
if (pcap_setfilter(pch, &cf.fcode) < 0) {
|
|
snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
|
|
pcap_geterr(pch));
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* Set up to write to the capture file. */
|
|
ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_datalink(pch));
|
|
if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
|
|
strcpy(errmsg, "The network you're capturing from is of a type"
|
|
" that Ethereal doesn't support.");
|
|
goto error;
|
|
}
|
|
ld.pdh = wtap_dump_fdopen(cf.save_file_fd, WTAP_FILE_PCAP,
|
|
ld.linktype, pcap_snapshot(pch), &err);
|
|
|
|
if (ld.pdh == NULL) {
|
|
/* We couldn't set up to write to the capture file. */
|
|
switch (err) {
|
|
|
|
case WTAP_ERR_CANT_OPEN:
|
|
strcpy(errmsg, "The file to which the capture would be saved"
|
|
" couldn't be created for some unknown reason.");
|
|
break;
|
|
|
|
case WTAP_ERR_SHORT_WRITE:
|
|
strcpy(errmsg, "A full header couldn't be written to the file"
|
|
" to which the capture would be saved.");
|
|
break;
|
|
|
|
default:
|
|
if (err < 0) {
|
|
sprintf(errmsg, "The file to which the capture would be"
|
|
" saved (\"%s\") could not be opened: Error %d.",
|
|
cf.save_file, err);
|
|
} else {
|
|
sprintf(errmsg, "The file to which the capture would be"
|
|
" saved (\"%s\") could not be opened: %s.",
|
|
cf.save_file, strerror(err));
|
|
}
|
|
break;
|
|
}
|
|
goto error;
|
|
}
|
|
|
|
if (capture_child) {
|
|
/* Well, we should be able to start capturing.
|
|
|
|
This is the child process for a sync mode capture, so sync out
|
|
the capture file, so the header makes it to the file system,
|
|
and send a "capture started successfully and capture file created"
|
|
message to our parent so that they'll open the capture file and
|
|
update its windows to indicate that we have a live capture in
|
|
progress. */
|
|
fflush(wtap_dump_file(ld.pdh));
|
|
write(1, "0;", 2);
|
|
}
|
|
|
|
cap_w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
|
|
gtk_window_set_title(GTK_WINDOW(cap_w), "Ethereal: Capture / Playback");
|
|
|
|
/* Container for capture display widgets */
|
|
main_vb = gtk_vbox_new(FALSE, 1);
|
|
gtk_container_border_width(GTK_CONTAINER(main_vb), 5);
|
|
gtk_container_add(GTK_CONTAINER(cap_w), main_vb);
|
|
gtk_widget_show(main_vb);
|
|
|
|
count_lb = gtk_label_new("Count: 0");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), count_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(count_lb);
|
|
|
|
tcp_lb = gtk_label_new("TCP: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), tcp_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(tcp_lb);
|
|
|
|
udp_lb = gtk_label_new("UDP: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), udp_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(udp_lb);
|
|
|
|
icmp_lb = gtk_label_new("ICMP: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), icmp_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(icmp_lb);
|
|
|
|
ospf_lb = gtk_label_new("OSPF: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), ospf_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(ospf_lb);
|
|
|
|
gre_lb = gtk_label_new("GRE: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), gre_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(gre_lb);
|
|
|
|
netbios_lb = gtk_label_new("NetBIOS: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), netbios_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(netbios_lb);
|
|
|
|
ipx_lb = gtk_label_new("IPX: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), ipx_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(ipx_lb);
|
|
|
|
vines_lb = gtk_label_new("VINES: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), vines_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(vines_lb);
|
|
|
|
other_lb = gtk_label_new("Other: 0 (0.0%)");
|
|
gtk_box_pack_start(GTK_BOX(main_vb), other_lb, FALSE, FALSE, 3);
|
|
gtk_widget_show(other_lb);
|
|
|
|
/* allow user to either click a stop button, or the close button on
|
|
the window to stop a capture in progress. */
|
|
stop_bt = gtk_button_new_with_label ("Stop");
|
|
gtk_signal_connect(GTK_OBJECT(stop_bt), "clicked",
|
|
GTK_SIGNAL_FUNC(capture_stop_cb), (gpointer) &ld);
|
|
gtk_signal_connect(GTK_OBJECT(cap_w), "delete_event",
|
|
GTK_SIGNAL_FUNC(capture_delete_cb), (gpointer) &ld);
|
|
gtk_box_pack_end(GTK_BOX(main_vb), stop_bt, FALSE, FALSE, 3);
|
|
GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
|
|
gtk_widget_grab_default(stop_bt);
|
|
GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
|
|
gtk_widget_grab_default(stop_bt);
|
|
gtk_widget_show(stop_bt);
|
|
|
|
gtk_widget_show(cap_w);
|
|
gtk_grab_add(cap_w);
|
|
|
|
upd_time = time(NULL);
|
|
#ifdef linux
|
|
pcap_fd = pcap_fileno(pch);
|
|
#endif
|
|
while (ld.go) {
|
|
while (gtk_events_pending()) gtk_main_iteration();
|
|
#ifdef linux
|
|
/*
|
|
* Sigh. The semantics of the read timeout argument to
|
|
* "pcap_open_live()" aren't particularly well specified by
|
|
* the "pcap" man page - at least with the BSD BPF code, the
|
|
* intent appears to be, at least in part, a way of cutting
|
|
* down the number of reads done on a capture, by blocking
|
|
* until the buffer fills or a timer expires - and the Linux
|
|
* libpcap doesn't actually support it, so we can't use it
|
|
* to break out of the "pcap_dispatch()" every 1/4 of a second
|
|
* or so.
|
|
*
|
|
* Thus, on Linux, we do a "select()" on the file descriptor for the
|
|
* capture, with a timeout of CAP_READ_TIMEOUT milliseconds, or
|
|
* CAP_READ_TIMEOUT*1000 microseconds.
|
|
*/
|
|
FD_ZERO(&set1);
|
|
FD_SET(pcap_fd, &set1);
|
|
timeout.tv_sec = 0;
|
|
timeout.tv_usec = CAP_READ_TIMEOUT*1000;
|
|
if (select(pcap_fd+1, &set1, NULL, NULL, &timeout) != 0) {
|
|
/*
|
|
* "select()" says we can read from it without blocking; go for
|
|
* it.
|
|
*/
|
|
inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (u_char *) &ld);
|
|
} else
|
|
inpkts = 0;
|
|
#else
|
|
inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (u_char *) &ld);
|
|
#endif
|
|
if (inpkts > 0)
|
|
ld.sync_packets += inpkts;
|
|
/* Only update once a second so as not to overload slow displays */
|
|
cur_time = time(NULL);
|
|
if (cur_time > upd_time) {
|
|
upd_time = cur_time;
|
|
|
|
sprintf(label_str, "Count: %d", ld.counts.total);
|
|
gtk_label_set(GTK_LABEL(count_lb), label_str);
|
|
|
|
sprintf(label_str, "TCP: %d (%.1f%%)", ld.counts.tcp,
|
|
pct(ld.counts.tcp, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(tcp_lb), label_str);
|
|
|
|
sprintf(label_str, "UDP: %d (%.1f%%)", ld.counts.udp,
|
|
pct(ld.counts.udp, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(udp_lb), label_str);
|
|
|
|
sprintf(label_str, "ICMP: %d (%.1f%%)", ld.counts.icmp,
|
|
pct(ld.counts.icmp, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(icmp_lb), label_str);
|
|
|
|
sprintf(label_str, "OSPF: %d (%.1f%%)", ld.counts.ospf,
|
|
pct(ld.counts.ospf, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(ospf_lb), label_str);
|
|
|
|
sprintf(label_str, "GRE: %d (%.1f%%)", ld.counts.gre,
|
|
pct(ld.counts.gre, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(gre_lb), label_str);
|
|
|
|
sprintf(label_str, "NetBIOS: %d (%.1f%%)", ld.counts.netbios,
|
|
pct(ld.counts.netbios, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(netbios_lb), label_str);
|
|
|
|
sprintf(label_str, "IPX: %d (%.1f%%)", ld.counts.ipx,
|
|
pct(ld.counts.ipx, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(ipx_lb), label_str);
|
|
|
|
sprintf(label_str, "VINES: %d (%.1f%%)", ld.counts.vines,
|
|
pct(ld.counts.vines, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(vines_lb), label_str);
|
|
|
|
sprintf(label_str, "Other: %d (%.1f%%)", ld.counts.other,
|
|
pct(ld.counts.other, ld.counts.total));
|
|
gtk_label_set(GTK_LABEL(other_lb), label_str);
|
|
|
|
/* do sync here, too */
|
|
fflush(wtap_dump_file(ld.pdh));
|
|
if (capture_child && ld.sync_packets) {
|
|
/* This is the child process for a sync mode capture, so send
|
|
our parent a message saying we've written out "ld.sync_packets"
|
|
packets to the capture file. */
|
|
char tmp[20];
|
|
sprintf(tmp, "%d*", ld.sync_packets);
|
|
write(1, tmp, strlen(tmp));
|
|
ld.sync_packets = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!wtap_dump_close(ld.pdh, &err)) {
|
|
/* XXX - in fork mode, this may not pop up, or, if it does,
|
|
it may disappear as soon as we exit.
|
|
|
|
We should have the parent process, while it's reading
|
|
the packet count update messages, catch error messages
|
|
and pop up a message box if it sees one. */
|
|
switch (err) {
|
|
|
|
case WTAP_ERR_CANT_CLOSE:
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"The file to which the capture was being saved"
|
|
" couldn't be closed for some unknown reason.");
|
|
break;
|
|
|
|
case WTAP_ERR_SHORT_WRITE:
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"Not all the data could be written to the file"
|
|
" to which the capture was being saved.");
|
|
break;
|
|
|
|
default:
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"The file to which the capture was being"
|
|
" saved (\"%s\") could not be closed: %s.",
|
|
cf.save_file, wtap_strerror(err));
|
|
break;
|
|
}
|
|
}
|
|
pcap_close(pch);
|
|
|
|
gtk_grab_remove(GTK_WIDGET(cap_w));
|
|
gtk_widget_destroy(GTK_WIDGET(cap_w));
|
|
|
|
return TRUE;
|
|
|
|
error:
|
|
/* We couldn't even start the capture, so get rid of the capture
|
|
file. */
|
|
unlink(cf.save_file); /* silently ignore error */
|
|
g_free(cf.save_file);
|
|
cf.save_file = NULL;
|
|
if (capture_child) {
|
|
/* This is the child process for a sync mode capture.
|
|
Send the error message to our parent, so they can display a
|
|
dialog box containing it. */
|
|
int msglen = strlen(errmsg);
|
|
char lenbuf[10+1+1];
|
|
sprintf(lenbuf, "%u;", msglen);
|
|
write(1, lenbuf, strlen(lenbuf));
|
|
write(1, errmsg, msglen);
|
|
} else {
|
|
/* Display the dialog box ourselves; there's no parent. */
|
|
simple_dialog(ESD_TYPE_WARN, NULL, errmsg);
|
|
}
|
|
if (pch != NULL)
|
|
pcap_close(pch);
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
static float
|
|
pct(gint num, gint denom) {
|
|
if (denom) {
|
|
return (float) num * 100.0 / (float) denom;
|
|
} else {
|
|
return 0.0;
|
|
}
|
|
}
|
|
|
|
static void
|
|
capture_delete_cb(GtkWidget *w, GdkEvent *event, gpointer data) {
|
|
capture_stop_cb(NULL, data);
|
|
}
|
|
|
|
static void
|
|
capture_stop_cb(GtkWidget *w, gpointer data) {
|
|
loop_data *ld = (loop_data *) data;
|
|
|
|
ld->go = FALSE;
|
|
}
|
|
|
|
static void
|
|
capture_pcap_cb(u_char *user, const struct pcap_pkthdr *phdr,
|
|
const u_char *pd) {
|
|
struct wtap_pkthdr whdr;
|
|
loop_data *ld = (loop_data *) user;
|
|
int err;
|
|
|
|
if ((++ld->counts.total >= ld->max) && (ld->max > 0))
|
|
{
|
|
ld->go = FALSE;
|
|
}
|
|
if (ld->pdh) {
|
|
/* "phdr->ts" may not necessarily be a "struct timeval" - it may
|
|
be a "struct bpf_timeval", with member sizes wired to 32
|
|
bits - and we may go that way ourselves in the future, so
|
|
copy the members individually. */
|
|
whdr.ts.tv_sec = phdr->ts.tv_sec;
|
|
whdr.ts.tv_usec = phdr->ts.tv_usec;
|
|
whdr.caplen = phdr->caplen;
|
|
whdr.len = phdr->len;
|
|
whdr.pkt_encap = ld->linktype;
|
|
|
|
/* XXX - do something if this fails */
|
|
wtap_dump(ld->pdh, &whdr, pd, &err);
|
|
}
|
|
|
|
/* Set the initial payload to the packet length, and the initial
|
|
captured payload to the capture length (other protocols may
|
|
reduce them if their headers say they're less). */
|
|
pi.len = phdr->len;
|
|
pi.captured_len = phdr->caplen;
|
|
|
|
switch (ld->linktype) {
|
|
case WTAP_ENCAP_ETHERNET:
|
|
capture_eth(pd, 0, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_FDDI:
|
|
case WTAP_ENCAP_FDDI_BITSWAPPED:
|
|
capture_fddi(pd, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_TR:
|
|
capture_tr(pd, 0, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_NULL:
|
|
capture_null(pd, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_PPP:
|
|
capture_ppp(pd, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_RAW_IP:
|
|
capture_raw(pd, &ld->counts);
|
|
break;
|
|
/* XXX - FreeBSD may append 4-byte ATM pseudo-header to DLT_ATM_RFC1483,
|
|
with LLC header following; we should implement it at some
|
|
point. */
|
|
}
|
|
}
|
|
|
|
#endif /* HAVE_LIBPCAP */
|