617 lines
18 KiB
C
617 lines
18 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 1.80 1999/10/20 22:35:57 gram 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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#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 "gtk/menu.h"
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#include "capture.h"
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#include "util.h"
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#include "prefs.h"
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#include "globals.h"
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int sync_mode; /* fork a child to do the capture, and sync between them */
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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 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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/* 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_temp_file;
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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_TRUNC|O_CREAT, 0600);
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is_temp_file = 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_temp_file = 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.", tmpname, strerror(errno));
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return;
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}
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close_cap_file(&cf, info_bar, file_ctx);
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if (cf.save_file != NULL) {
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/* If the current file is a temporary capture file, remove it. */
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if (!cf.user_saved)
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unlink(cf.save_file); /* silently ignore error */
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g_free(cf.save_file);
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}
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cf.save_file = capfile_name;
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cf.user_saved = !is_temp_file;
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if (sync_mode) { /* use fork() for capture */
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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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/* 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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}
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else {
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cf.filename = cf.save_file;
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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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XXX - reap it and report the status. */
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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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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. */
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err = tail_cap_file(cf.save_file, &cf);
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if (err != 0) {
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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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}
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} else {
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/* Failure. */
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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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}
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}
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}
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}
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else {
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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, &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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set_menu_sensitivity("/File/Save", TRUE);
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set_menu_sensitivity("/File/Save As...", FALSE);
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}
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}
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}
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}
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/* Do the low-level work of a capture.
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Returns TRUE if it succeeds, FALSE otherwise. */
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int
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capture(void)
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{
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GtkWidget *cap_w, *main_vb, *count_lb, *tcp_lb, *udp_lb, *icmp_lb,
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*ospf_lb, *gre_lb, *netbios_lb, *other_lb, *stop_bt;
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pcap_t *pch;
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gchar err_str[PCAP_ERRBUF_SIZE], label_str[32];
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loop_data ld;
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bpf_u_int32 netnum, netmask;
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time_t upd_time, cur_time;
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int err, inpkts;
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char errmsg[1024+1];
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ld.go = TRUE;
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ld.counts.total = 0;
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ld.max = cf.count;
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ld.linktype = WTAP_ENCAP_UNKNOWN;
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ld.sync_packets = 0;
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ld.counts.tcp = 0;
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ld.counts.udp = 0;
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ld.counts.icmp = 0;
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ld.counts.ospf = 0;
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ld.counts.gre = 0;
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ld.counts.netbios = 0;
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ld.counts.other = 0;
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ld.pdh = NULL;
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/* Open the network interface to capture from it. */
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pch = pcap_open_live(cf.iface, cf.snap, 1, 250, err_str);
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if (pch == NULL) {
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/* Well, we couldn't start the capture.
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If this is a child process that does the capturing in sync
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mode or fork mode, it shouldn't do any UI stuff until we pop up the
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capture-progress window, and, since we couldn't start the
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capture, we haven't popped it up. */
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if (!capture_child) {
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while (gtk_events_pending()) gtk_main_iteration();
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}
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snprintf(errmsg, sizeof errmsg,
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"The capture session could not be initiated (%s).\n"
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"Please check to make sure you have sufficient permissions, and that\n"
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"you have the proper interface specified.", err_str);
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goto error;
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}
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if (cf.cfilter) {
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/* A capture filter was specified; set it up. */
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if (pcap_lookupnet (cf.iface, &netnum, &netmask, err_str) < 0) {
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snprintf(errmsg, sizeof errmsg,
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"Can't use filter: Couldn't obtain netmask info (%s).", err_str);
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goto error;
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}
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if (pcap_compile(pch, &cf.fcode, cf.cfilter, 1, netmask) < 0) {
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snprintf(errmsg, sizeof errmsg, "Unable to parse filter string (%s).",
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pcap_geterr(pch));
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goto error;
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}
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if (pcap_setfilter(pch, &cf.fcode) < 0) {
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snprintf(errmsg, sizeof errmsg, "Can't install filter (%s).",
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pcap_geterr(pch));
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goto error;
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}
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}
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/* Set up to write to the capture file. */
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ld.linktype = wtap_pcap_encap_to_wtap_encap(pcap_datalink(pch));
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if (ld.linktype == WTAP_ENCAP_UNKNOWN) {
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strcpy(errmsg, "The network you're capturing from is of a type"
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" that Ethereal doesn't support.");
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goto error;
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}
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ld.pdh = wtap_dump_fdopen(cf.save_file_fd, WTAP_FILE_PCAP,
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ld.linktype, pcap_snapshot(pch), &err);
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if (ld.pdh == NULL) {
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/* We couldn't set up to write to the capture file. */
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switch (err) {
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case WTAP_ERR_CANT_OPEN:
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strcpy(errmsg, "The file to which the capture would be saved"
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" couldn't be created for some unknown reason.");
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break;
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case WTAP_ERR_SHORT_WRITE:
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strcpy(errmsg, "A full header couldn't be written to the file"
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" to which the capture would be saved.");
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break;
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default:
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if (err < 0) {
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sprintf(errmsg, "The file to which the capture would be"
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" saved (\"%s\") could not be opened: Error %d.",
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cf.save_file, err);
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} else {
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sprintf(errmsg, "The file to which the capture would be"
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" saved (\"%s\") could not be opened: %s.",
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cf.save_file, strerror(err));
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}
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break;
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}
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goto error;
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}
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if (capture_child) {
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/* Well, we should be able to start capturing.
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This is the child process for a sync mode capture, so sync out
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the capture file, so the header makes it to the file system,
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and send a "capture started successfully and capture file created"
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message to our parent so that they'll open the capture file and
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update its windows to indicate that we have a live capture in
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progress. */
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fflush(wtap_dump_file(ld.pdh));
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write(1, "0;", 2);
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}
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cap_w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
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gtk_window_set_title(GTK_WINDOW(cap_w), "Ethereal: Capture / Playback");
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/* Container for capture display widgets */
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main_vb = gtk_vbox_new(FALSE, 1);
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gtk_container_border_width(GTK_CONTAINER(main_vb), 5);
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gtk_container_add(GTK_CONTAINER(cap_w), main_vb);
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gtk_widget_show(main_vb);
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count_lb = gtk_label_new("Count: 0");
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gtk_box_pack_start(GTK_BOX(main_vb), count_lb, FALSE, FALSE, 3);
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gtk_widget_show(count_lb);
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tcp_lb = gtk_label_new("TCP: 0 (0.0%)");
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gtk_box_pack_start(GTK_BOX(main_vb), tcp_lb, FALSE, FALSE, 3);
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gtk_widget_show(tcp_lb);
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udp_lb = gtk_label_new("UDP: 0 (0.0%)");
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gtk_box_pack_start(GTK_BOX(main_vb), udp_lb, FALSE, FALSE, 3);
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gtk_widget_show(udp_lb);
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icmp_lb = gtk_label_new("ICMP: 0 (0.0%)");
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gtk_box_pack_start(GTK_BOX(main_vb), icmp_lb, FALSE, FALSE, 3);
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gtk_widget_show(icmp_lb);
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ospf_lb = gtk_label_new("OSPF: 0 (0.0%)");
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gtk_box_pack_start(GTK_BOX(main_vb), ospf_lb, FALSE, FALSE, 3);
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gtk_widget_show(ospf_lb);
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gre_lb = gtk_label_new("GRE: 0 (0.0%)");
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gtk_box_pack_start(GTK_BOX(main_vb), gre_lb, FALSE, FALSE, 3);
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gtk_widget_show(gre_lb);
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netbios_lb = gtk_label_new("NetBIOS: 0 (0.0%)");
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gtk_box_pack_start(GTK_BOX(main_vb), netbios_lb, FALSE, FALSE, 3);
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gtk_widget_show(netbios_lb);
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other_lb = gtk_label_new("Other: 0 (0.0%)");
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gtk_box_pack_start(GTK_BOX(main_vb), other_lb, FALSE, FALSE, 3);
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gtk_widget_show(other_lb);
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stop_bt = gtk_button_new_with_label ("Stop");
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gtk_signal_connect(GTK_OBJECT(stop_bt), "clicked",
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GTK_SIGNAL_FUNC(capture_stop_cb), (gpointer) &ld);
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gtk_box_pack_end(GTK_BOX(main_vb), stop_bt, FALSE, FALSE, 3);
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GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
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gtk_widget_grab_default(stop_bt);
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GTK_WIDGET_SET_FLAGS(stop_bt, GTK_CAN_DEFAULT);
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gtk_widget_grab_default(stop_bt);
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gtk_widget_show(stop_bt);
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gtk_widget_show(cap_w);
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gtk_grab_add(cap_w);
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upd_time = time(NULL);
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while (ld.go) {
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while (gtk_events_pending()) gtk_main_iteration();
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inpkts = pcap_dispatch(pch, 1, capture_pcap_cb, (u_char *) &ld);
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if (inpkts > 0)
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ld.sync_packets += inpkts;
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/* Only update once a second so as not to overload slow displays */
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cur_time = time(NULL);
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if (cur_time > upd_time) {
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upd_time = cur_time;
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sprintf(label_str, "Count: %d", ld.counts.total);
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gtk_label_set(GTK_LABEL(count_lb), label_str);
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sprintf(label_str, "TCP: %d (%.1f%%)", ld.counts.tcp,
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pct(ld.counts.tcp, ld.counts.total));
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gtk_label_set(GTK_LABEL(tcp_lb), label_str);
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sprintf(label_str, "UDP: %d (%.1f%%)", ld.counts.udp,
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pct(ld.counts.udp, ld.counts.total));
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gtk_label_set(GTK_LABEL(udp_lb), label_str);
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sprintf(label_str, "ICMP: %d (%.1f%%)", ld.counts.icmp,
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pct(ld.counts.icmp, ld.counts.total));
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gtk_label_set(GTK_LABEL(icmp_lb), label_str);
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sprintf(label_str, "OSPF: %d (%.1f%%)", ld.counts.ospf,
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pct(ld.counts.ospf, ld.counts.total));
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gtk_label_set(GTK_LABEL(ospf_lb), label_str);
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sprintf(label_str, "GRE: %d (%.1f%%)", ld.counts.gre,
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pct(ld.counts.gre, ld.counts.total));
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gtk_label_set(GTK_LABEL(gre_lb), label_str);
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sprintf(label_str, "NetBIOS: %d (%.1f%%)", ld.counts.netbios,
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pct(ld.counts.netbios, ld.counts.total));
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gtk_label_set(GTK_LABEL(netbios_lb), label_str);
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sprintf(label_str, "Other: %d (%.1f%%)", ld.counts.other,
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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:
|
|
if (err < 0) {
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"The file to which the capture was being"
|
|
" saved (\"%s\") could not be closed: Error %d.",
|
|
cf.save_file, err);
|
|
} else {
|
|
simple_dialog(ESD_TYPE_WARN, NULL,
|
|
"The file to which the capture was being"
|
|
" saved (\"%s\") could not be closed: %s.",
|
|
cf.save_file, 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 */
|
|
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_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) {
|
|
whdr.ts = phdr->ts;
|
|
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);
|
|
}
|
|
|
|
switch (ld->linktype) {
|
|
case WTAP_ENCAP_ETHERNET:
|
|
capture_eth(pd, phdr->caplen, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_FDDI:
|
|
case WTAP_ENCAP_FDDI_BITSWAPPED:
|
|
capture_fddi(pd, phdr->caplen, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_TR:
|
|
capture_tr(pd, phdr->caplen, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_NULL:
|
|
capture_null(pd, phdr->caplen, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_PPP:
|
|
capture_ppp(pd, phdr->caplen, &ld->counts);
|
|
break;
|
|
case WTAP_ENCAP_RAW_IP:
|
|
capture_raw(pd, phdr->caplen, &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 */
|