forked from osmocom/wireshark
f68d6e4c8c
svn path=/trunk/; revision=18235
566 lines
18 KiB
C
566 lines
18 KiB
C
/* capture.c
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* Routines for packet capture
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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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_UNISTD_H
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#include <unistd.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include <signal.h>
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#include <errno.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/dfilter/dfilter.h>
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#include "file.h"
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#include "capture.h"
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#include "capture_sync.h"
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#include "capture_info.h"
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#include "capture_ui_utils.h"
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#include "util.h"
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#include "capture-pcap-util.h"
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#include "alert_box.h"
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#include "simple_dialog.h"
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#include <epan/prefs.h>
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#include "conditions.h"
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#include "ringbuffer.h"
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#ifdef _WIN32
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#include "capture-wpcap.h"
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#endif
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#include "ui_util.h"
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#include "file_util.h"
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#include "log.h"
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/**
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* Start a capture.
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*
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* @return TRUE if the capture starts successfully, FALSE otherwise.
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*/
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gboolean
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capture_start(capture_options *capture_opts)
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{
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gboolean ret;
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/* close the currently loaded capture file */
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cf_close(capture_opts->cf);
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g_assert(capture_opts->state == CAPTURE_STOPPED);
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capture_opts->state = CAPTURE_PREPARING;
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start ...");
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/* try to start the capture child process */
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ret = sync_pipe_start(capture_opts);
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if(!ret) {
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if(capture_opts->save_file != NULL) {
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g_free(capture_opts->save_file);
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capture_opts->save_file = NULL;
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}
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start failed!");
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capture_opts->state = CAPTURE_STOPPED;
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} else {
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/* the capture child might not respond shortly after bringing it up */
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/* (especially it will block, if no input coming from an input capture pipe (e.g. mkfifo) is coming in) */
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/* to prevent problems, bring the main GUI into "capture mode" right after successfully */
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/* spawn/exec the capture child, without waiting for any response from it */
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cf_callback_invoke(cf_cb_live_capture_prepared, capture_opts);
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if(capture_opts->show_info)
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capture_info_open(capture_opts->iface);
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}
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return ret;
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}
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void
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capture_stop(capture_options *capture_opts)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Stop ...");
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cf_callback_invoke(cf_cb_live_capture_stopping, capture_opts);
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/* stop the capture child gracefully */
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sync_pipe_stop(capture_opts);
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}
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void
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capture_restart(capture_options *capture_opts)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Restart");
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capture_opts->restart = TRUE;
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capture_stop(capture_opts);
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}
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void
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capture_kill_child(capture_options *capture_opts)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "Capture Kill");
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/* kill the capture child */
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sync_pipe_kill(capture_opts);
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}
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/* We've succeeded a (non real-time) capture, try to read it into a new capture file */
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static gboolean
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capture_input_read_all(capture_options *capture_opts, gboolean is_tempfile, gboolean drops_known,
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guint32 drops)
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{
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int err;
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/* Capture succeeded; attempt to open the capture file. */
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if (cf_open(capture_opts->cf, capture_opts->save_file, is_tempfile, &err) != CF_OK) {
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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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return FALSE;
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}
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/* Set the read filter to NULL. */
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/* XXX - this is odd here, try to put it somewhere, where it fits better */
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cf_set_rfcode(capture_opts->cf, NULL);
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/* Get the packet-drop statistics.
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XXX - there are currently no packet-drop statistics stored
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in libpcap captures, and that's what we're reading.
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At some point, we will add support in Wiretap to return
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packet-drop statistics for capture file formats that store it,
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and will make "cf_read()" get those statistics from Wiretap.
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We clear the statistics (marking them as "not known") in
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"cf_open()", and "cf_read()" will only fetch them and mark
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them as known if Wiretap supplies them, so if we get the
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statistics now, after calling "cf_open()" but before calling
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"cf_read()", the values we store will be used by "cf_read()".
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If a future libpcap capture file format stores the statistics,
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we'll put them into the capture file that we write, and will
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thus not have to set them here - "cf_read()" will get them from
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the file and use them. */
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if (drops_known) {
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cf_set_drops_known(capture_opts->cf, TRUE);
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/* XXX - on some systems, libpcap doesn't bother filling in
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"ps_ifdrop" - it doesn't even set it to zero - so we don't
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bother looking at it.
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Ideally, libpcap would have an interface that gave us
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several statistics - perhaps including various interface
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error statistics - and would tell us which of them it
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supplies, allowing us to display only the ones it does. */
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cf_set_drops(capture_opts->cf, drops);
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}
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/* read in the packet data */
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switch (cf_read(capture_opts->cf)) {
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case CF_READ_OK:
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case CF_READ_ERROR:
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/* Just because we got an error, that doesn't mean we were unable
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to read any of the file; we handle what we could get from the
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file. */
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break;
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case CF_READ_ABORTED:
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/* User wants to quit program. Exit by leaving the main loop,
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so that any quit functions we registered get called. */
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main_window_nested_quit();
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return FALSE;
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}
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/* if we didn't captured even a single packet, close the file again */
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if(cf_get_packet_count(capture_opts->cf) == 0 && !capture_opts->restart) {
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simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
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"%sNo packets captured!%s\n"
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"\n"
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"As no data was captured, closing the %scapture file!\n"
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"\n"
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"\n"
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"Help about capturing can be found at:\n"
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"\n"
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" http://wiki.wireshark.org/CaptureSetup"
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#ifdef _WIN32
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"\n\n"
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"Wireless (Wi-Fi/WLAN):\n"
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"Try to switch off promiscuous mode in the Capture Options!"
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#endif
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"",
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simple_dialog_primary_start(), simple_dialog_primary_end(),
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(cf_is_tempfile(capture_opts->cf)) ? "temporary " : "");
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cf_close(capture_opts->cf);
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}
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return TRUE;
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}
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/* capture child tells us we have a new (or the first) capture file */
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gboolean
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capture_input_new_file(capture_options *capture_opts, gchar *new_file)
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{
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gboolean is_tempfile;
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int err;
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if(capture_opts->state == CAPTURE_PREPARING) {
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture started!");
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}
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "File: \"%s\"", new_file);
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g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
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/* free the old filename */
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if(capture_opts->save_file != NULL) {
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/* we start a new capture file, close the old one (if we had one before) */
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/* (we can only have an open capture file in real_time_mode!) */
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if( ((capture_file *) capture_opts->cf)->state != FILE_CLOSED) {
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cf_callback_invoke(cf_cb_live_capture_update_finished, capture_opts->cf);
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cf_finish_tail(capture_opts->cf, &err);
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cf_close(capture_opts->cf);
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}
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g_free(capture_opts->save_file);
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is_tempfile = FALSE;
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cf_set_tempfile(capture_opts->cf, FALSE);
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} else {
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/* we didn't had a save_file before, must be a tempfile */
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is_tempfile = TRUE;
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cf_set_tempfile(capture_opts->cf, TRUE);
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}
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/* save the new filename */
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capture_opts->save_file = g_strdup(new_file);
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/* if we are in real-time mode, open the new file now */
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if(capture_opts->real_time_mode) {
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/* Attempt to open the capture file and set up to read from it. */
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switch(cf_start_tail(capture_opts->cf, capture_opts->save_file, is_tempfile, &err)) {
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case CF_OK:
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break;
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case CF_ERROR:
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/* Don't unlink (delete) the save file - leave it around,
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for debugging purposes. */
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g_free(capture_opts->save_file);
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capture_opts->save_file = NULL;
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return FALSE;
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break;
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}
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}
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if(capture_opts->show_info) {
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if (!capture_info_new_file(new_file))
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return FALSE;
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}
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if(capture_opts->real_time_mode) {
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cf_callback_invoke(cf_cb_live_capture_update_started, capture_opts);
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} else {
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cf_callback_invoke(cf_cb_live_capture_fixed_started, capture_opts);
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}
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capture_opts->state = CAPTURE_RUNNING;
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return TRUE;
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}
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/* capture child tells us we have new packets to read */
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void
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capture_input_new_packets(capture_options *capture_opts, int to_read)
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{
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int err;
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g_assert(capture_opts->save_file);
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if(capture_opts->real_time_mode) {
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/* Read from the capture file the number of records the child told us it added. */
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switch (cf_continue_tail(capture_opts->cf, to_read, &err)) {
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case CF_READ_OK:
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case CF_READ_ERROR:
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/* Just because we got an error, that doesn't mean we were unable
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to read any of the file; we handle what we could get from the
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file.
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XXX - abort on a read error? */
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cf_callback_invoke(cf_cb_live_capture_update_continue, capture_opts->cf);
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break;
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case CF_READ_ABORTED:
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/* Kill the child capture process; the user wants to exit, and we
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shouldn't just leave it running. */
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capture_kill_child(capture_opts);
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break;
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}
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} else {
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/* increase capture file packet counter by the number or incoming packets */
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cf_set_packet_count(capture_opts->cf,
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cf_get_packet_count(capture_opts->cf) + to_read);
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cf_callback_invoke(cf_cb_live_capture_fixed_continue, capture_opts->cf);
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}
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/* update the main window, so we get events (e.g. from the stop toolbar button) */
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main_window_update();
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if(capture_opts->show_info)
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capture_info_new_packets(to_read);
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}
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/* Capture child told us how many dropped packets it counted.
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*/
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void
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capture_input_drops(capture_options *capture_opts, int dropped)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "%d packet%s dropped", dropped, plurality(dropped, "", "s"));
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g_assert(capture_opts->state == CAPTURE_RUNNING);
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cf_set_drops_known(capture_opts->cf, TRUE);
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cf_set_drops(capture_opts->cf, dropped);
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}
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/* Capture child told us that an error has occurred while starting/running
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the capture.
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The buffer we're handed has *two* null-terminated strings in it - a
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primary message and a secondary message, one right after the other.
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The secondary message might be a null string.
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*/
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void
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capture_input_error_message(capture_options *capture_opts, char *error_msg, char *secondary_error_msg)
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{
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gchar *safe_error_msg;
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gchar *safe_secondary_error_msg;
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Error message from child: \"%s\", \"%s\"",
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error_msg, secondary_error_msg);
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g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
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safe_error_msg = simple_dialog_format_message(error_msg);
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if (*secondary_error_msg != '\0') {
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/* We have both primary and secondary messages. */
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safe_secondary_error_msg = simple_dialog_format_message(secondary_error_msg);
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s%s%s\n\n%s",
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simple_dialog_primary_start(), safe_error_msg,
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simple_dialog_primary_end(), safe_secondary_error_msg);
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g_free(safe_secondary_error_msg);
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} else {
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/* We have only a primary message. */
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s%s%s",
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simple_dialog_primary_start(), safe_error_msg,
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simple_dialog_primary_end());
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}
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g_free(safe_error_msg);
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/* the capture child will close the sync_pipe if required, nothing to do for now */
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}
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/* Capture child told us that an error has occurred while parsing a
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capture filter when starting/running the capture.
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*/
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void
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capture_input_cfilter_error_message(capture_options *capture_opts, char *error_message)
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{
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dfilter_t *rfcode = NULL;
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gchar *safe_cfilter = simple_dialog_format_message(capture_opts->cfilter);
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gchar *safe_cfilter_error_msg = simple_dialog_format_message(error_message);
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture filter error message from child: \"%s\"", error_message);
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g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
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/* Did the user try a display filter? */
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if (dfilter_compile(capture_opts->cfilter, &rfcode) && rfcode != NULL) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"%sInvalid capture filter: \"%s\"!%s\n"
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"\n"
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"That string looks like a valid display filter; however, it isn't a valid\n"
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"capture filter (%s).\n"
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"\n"
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"Note that display filters and capture filters don't have the same syntax,\n"
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"so you can't use most display filter expressions as capture filters.\n"
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"\n"
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"See the User's Guide for a description of the capture filter syntax.",
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simple_dialog_primary_start(), safe_cfilter,
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simple_dialog_primary_end(), safe_cfilter_error_msg);
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dfilter_free(rfcode);
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} else {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"%sInvalid capture filter: \"%s\"!%s\n"
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"\n"
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"That string isn't a valid capture filter (%s).\n"
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"See the User's Guide for a description of the capture filter syntax.",
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simple_dialog_primary_start(), safe_cfilter,
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simple_dialog_primary_end(), safe_cfilter_error_msg);
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}
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g_free(safe_cfilter_error_msg);
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g_free(safe_cfilter);
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/* the capture child will close the sync_pipe if required, nothing to do for now */
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}
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/* capture child closed its side of the pipe, do the required cleanup */
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void
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capture_input_closed(capture_options *capture_opts)
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{
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int err;
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture stopped!");
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g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
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/* if we didn't started the capture, do a fake start */
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/* (happens if we got an error message - we won't get a filename then) */
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if(capture_opts->state == CAPTURE_PREPARING) {
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if(capture_opts->real_time_mode) {
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cf_callback_invoke(cf_cb_live_capture_update_started, capture_opts);
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} else {
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cf_callback_invoke(cf_cb_live_capture_fixed_started, capture_opts);
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}
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}
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if(capture_opts->real_time_mode) {
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cf_read_status_t status;
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/* Read what remains of the capture file. */
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status = cf_finish_tail(capture_opts->cf, &err);
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/* Tell the GUI, we are not doing a capture any more.
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Must be done after the cf_finish_tail(), so file lengths are displayed
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correct. */
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cf_callback_invoke(cf_cb_live_capture_update_finished, capture_opts->cf);
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/* Finish the capture. */
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switch (status) {
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case CF_READ_OK:
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if(cf_get_packet_count(capture_opts->cf) == 0 && !capture_opts->restart) {
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simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
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"%sNo packets captured!%s\n"
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"\n"
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"As no data was captured, closing the %scapture file!\n"
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"\n"
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"\n"
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"Help about capturing can be found at:\n"
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"\n"
|
|
" http://wiki.wireshark.org/CaptureSetup"
|
|
#ifdef _WIN32
|
|
"\n\n"
|
|
"Wireless (Wi-Fi/WLAN):\n"
|
|
"Try to switch off promiscuous mode in the Capture Options!"
|
|
#endif
|
|
"",
|
|
simple_dialog_primary_start(), simple_dialog_primary_end(),
|
|
cf_is_tempfile(capture_opts->cf) ? "temporary " : "");
|
|
cf_close(capture_opts->cf);
|
|
}
|
|
break;
|
|
case CF_READ_ERROR:
|
|
/* Just because we got an error, that doesn't mean we were unable
|
|
to read any of the file; we handle what we could get from the
|
|
file. */
|
|
break;
|
|
|
|
case CF_READ_ABORTED:
|
|
/* Exit by leaving the main loop, so that any quit functions
|
|
we registered get called. */
|
|
main_window_quit();
|
|
}
|
|
|
|
} else {
|
|
/* first of all, we are not doing a capture any more */
|
|
cf_callback_invoke(cf_cb_live_capture_fixed_finished, capture_opts->cf);
|
|
|
|
/* this is a normal mode capture and if no error happened, read in the capture file data */
|
|
if(capture_opts->save_file != NULL) {
|
|
capture_input_read_all(capture_opts, cf_is_tempfile(capture_opts->cf),
|
|
cf_get_drops_known(capture_opts->cf), cf_get_drops(capture_opts->cf));
|
|
}
|
|
}
|
|
|
|
if(capture_opts->show_info)
|
|
capture_info_close();
|
|
|
|
capture_opts->state = CAPTURE_STOPPED;
|
|
|
|
/* if we couldn't open a capture file, there's nothing more for us to do */
|
|
if(capture_opts->save_file == NULL) {
|
|
cf_close(capture_opts->cf);
|
|
return;
|
|
}
|
|
|
|
/* does the user wants to restart the current capture? */
|
|
if(capture_opts->restart) {
|
|
capture_opts->restart = FALSE;
|
|
|
|
eth_unlink(capture_opts->save_file);
|
|
|
|
/* if it was a tempfile, throw away the old filename (so it will become a tempfile again) */
|
|
if(cf_is_tempfile(capture_opts->cf)) {
|
|
g_free(capture_opts->save_file);
|
|
capture_opts->save_file = NULL;
|
|
}
|
|
|
|
/* ... and start the capture again */
|
|
capture_start(capture_opts);
|
|
} else {
|
|
/* We're not doing a capture any more, so we don't have a save file. */
|
|
g_free(capture_opts->save_file);
|
|
capture_opts->save_file = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
#endif /* HAVE_LIBPCAP */
|