4852c618d8
svn path=/trunk/; revision=14205
369 lines
13 KiB
C
369 lines
13 KiB
C
/* capture_opts.c
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* Routines for capture options setting
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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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#include <string.h>
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#include <ctype.h>
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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 <pcap.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include "capture.h"
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#include "ringbuffer.h"
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#include "clopts_common.h"
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void
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capture_opts_init(capture_options *capture_opts, void *cfile)
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{
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capture_opts->cf = cfile;
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capture_opts->cfilter = g_strdup(""); /* No capture filter string specified */
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capture_opts->iface = NULL; /* Default is "pick the first interface" */
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#ifdef _WIN32
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capture_opts->buffer_size = 1; /* 1 MB */
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#endif
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capture_opts->has_snaplen = FALSE;
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capture_opts->snaplen = WTAP_MAX_PACKET_SIZE; /* snapshot length - default is
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infinite, in effect */
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capture_opts->promisc_mode = TRUE; /* promiscuous mode is the default */
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capture_opts->linktype = -1; /* the default linktype */
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capture_opts->save_file = NULL;
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capture_opts->real_time_mode = TRUE;
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capture_opts->show_info = TRUE;
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capture_opts->quit_after_cap = FALSE;
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capture_opts->restart = FALSE;
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capture_opts->multi_files_on = FALSE;
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capture_opts->has_file_duration = FALSE;
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capture_opts->file_duration = 60; /* 1 min */
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capture_opts->has_ring_num_files = FALSE;
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capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
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capture_opts->has_autostop_files = FALSE;
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capture_opts->autostop_files = 1;
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capture_opts->has_autostop_packets = FALSE;
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capture_opts->autostop_packets = 0;
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capture_opts->has_autostop_filesize = FALSE;
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capture_opts->autostop_filesize = 1024 * 1024; /* 1 MB */
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capture_opts->has_autostop_duration = FALSE;
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capture_opts->autostop_duration = 60; /* 1 min */
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capture_opts->fork_child = -1; /* invalid process handle */
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#ifdef _WIN32
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capture_opts->signal_pipe_fd = -1;
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#endif
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capture_opts->state = CAPTURE_STOPPED;
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}
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/* debug only: print content of capture_opts to console */
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void
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capture_opts_info(capture_options *capture_opts) {
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g_warning("CAPTURE OPTIONS :");
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g_warning("File : %p", capture_opts->cf);
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g_warning("Filter : %s", capture_opts->cfilter);
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g_warning("Interface : %s", capture_opts->iface);
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#ifdef _WIN32
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g_warning("BufferSize : %u (MB)", capture_opts->buffer_size);
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#endif
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g_warning("SnapLen (%u): %u", capture_opts->has_snaplen, capture_opts->snaplen);
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g_warning("Promisc : %u", capture_opts->promisc_mode);
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g_warning("LinkType : %d", capture_opts->linktype);
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g_warning("SaveFile : %s", (capture_opts->save_file) ? capture_opts->save_file : "");
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g_warning("RealTimeMode : %u", capture_opts->real_time_mode);
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g_warning("ShowInfo : %u", capture_opts->show_info);
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g_warning("QuitAfterCap : %u", capture_opts->quit_after_cap);
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g_warning("MultiFilesOn : %u", capture_opts->multi_files_on);
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g_warning("FileDuration (%u): %u", capture_opts->has_file_duration, capture_opts->file_duration);
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g_warning("RingNumFiles (%u): %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files);
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g_warning("AutostopFiles (%u): %u", capture_opts->has_autostop_files, capture_opts->autostop_files);
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g_warning("AutostopPackets (%u): %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets);
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g_warning("AutostopFilesize(%u): %u", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize);
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g_warning("AutostopDuration(%u): %u", capture_opts->has_autostop_duration, capture_opts->autostop_duration);
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g_warning("ForkChild : %d", capture_opts->fork_child);
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#ifdef _WIN32
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g_warning("SignalPipeFd : %d", capture_opts->signal_pipe_fd);
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#endif
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}
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/*
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* Given a string of the form "<autostop criterion>:<value>", as might appear
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* as an argument to a "-a" option, parse it and set the criterion in
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* question. Return an indication of whether it succeeded or failed
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* in some fashion.
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*/
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static gboolean
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set_autostop_criterion(capture_options *capture_opts, const char *appname, const char *autostoparg)
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{
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gchar *p, *colonp;
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colonp = strchr(autostoparg, ':');
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if (colonp == NULL)
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return FALSE;
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p = colonp;
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*p++ = '\0';
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/*
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* Skip over any white space (there probably won't be any, but
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* as we allow it in the preferences file, we might as well
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* allow it here).
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*/
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while (isspace((guchar)*p))
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p++;
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if (*p == '\0') {
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/*
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* Put the colon back, so if our caller uses, in an
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* error message, the string they passed us, the message
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* looks correct.
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*/
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*colonp = ':';
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return FALSE;
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}
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if (strcmp(autostoparg,"duration") == 0) {
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capture_opts->has_autostop_duration = TRUE;
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capture_opts->autostop_duration = get_positive_int(appname, p,"autostop duration");
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} else if (strcmp(autostoparg,"filesize") == 0) {
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capture_opts->has_autostop_filesize = TRUE;
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capture_opts->autostop_filesize = get_positive_int(appname, p,"autostop filesize");
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} else if (strcmp(autostoparg,"files") == 0) {
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capture_opts->multi_files_on = TRUE;
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capture_opts->has_autostop_files = TRUE;
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capture_opts->autostop_files = get_positive_int(appname, p,"autostop files");
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} else {
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return FALSE;
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}
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*colonp = ':'; /* put the colon back */
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return TRUE;
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}
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/*
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* Given a string of the form "<ring buffer file>:<duration>", as might appear
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* as an argument to a "-b" option, parse it and set the arguments in
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* question. Return an indication of whether it succeeded or failed
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* in some fashion.
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*/
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static gboolean
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get_ring_arguments(capture_options *capture_opts, const char *appname, const char *arg)
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{
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gchar *p = NULL, *colonp;
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colonp = strchr(arg, ':');
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if (colonp == NULL)
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return TRUE;
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p = colonp;
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*p++ = '\0';
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/*
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* Skip over any white space (there probably won't be any, but
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* as we allow it in the preferences file, we might as well
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* allow it here).
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*/
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while (isspace((guchar)*p))
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p++;
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if (*p == '\0') {
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/*
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* Put the colon back, so if our caller uses, in an
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* error message, the string they passed us, the message
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* looks correct.
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*/
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*colonp = ':';
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return FALSE;
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}
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if (strcmp(arg,"files") == 0) {
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capture_opts->has_ring_num_files = TRUE;
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capture_opts->ring_num_files = get_natural_int(appname, p, "number of ring buffer files");
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} else if (strcmp(arg,"filesize") == 0) {
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capture_opts->has_autostop_filesize = TRUE;
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capture_opts->autostop_filesize = get_positive_int(appname, p, "ring buffer filesize");
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} else if (strcmp(arg,"duration") == 0) {
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capture_opts->has_file_duration = TRUE;
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capture_opts->file_duration = get_positive_int(appname, p, "ring buffer duration");
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}
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*colonp = ':'; /* put the colon back */
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return TRUE;
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}
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#ifdef _WIN32
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/*
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* Given a string of the form "<pipe name>:<file descriptor>", as might appear
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* as an argument to a "-Z" option, parse it and set the arguments in
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* question. Return an indication of whether it succeeded or failed
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* in some fashion.
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*/
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static gboolean
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get_pipe_arguments(capture_options *capture_opts, const char *appname, const char *arg)
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{
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gchar *p = NULL, *colonp;
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int pipe_fd;
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colonp = strchr(arg, ':');
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if (colonp == NULL)
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return TRUE;
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p = colonp;
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*p++ = '\0';
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/*
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* Skip over any white space (there probably won't be any, but
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* as we allow it in the preferences file, we might as well
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* allow it here).
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*/
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while (isspace((guchar)*p))
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p++;
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if (*p == '\0') {
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/*
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* Put the colon back, so if our caller uses, in an
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* error message, the string they passed us, the message
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* looks correct.
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*/
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*colonp = ':';
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return FALSE;
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}
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if (strcmp(arg,"sync") == 0) {
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/* associate stdout with sync pipe */
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pipe_fd = get_natural_int(appname, p, "sync pipe file descriptor");
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if (dup2(pipe_fd, 1) < 0) {
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fprintf(stderr, "%s: Unable to dup sync pipe handle\n", appname);
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return FALSE;
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}
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} else if (strcmp(arg,"signal") == 0) {
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/* associate stdin with signal pipe */
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pipe_fd = get_natural_int(appname, p, "signal pipe file descriptor");
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if (dup2(pipe_fd, 0) < 0) {
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fprintf(stderr, "%s: Unable to dup signal pipe handle\n", appname);
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return FALSE;
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}
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}
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*colonp = ':'; /* put the colon back */
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return TRUE;
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}
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#endif
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void
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capture_opts_add_opt(capture_options *capture_opts, const char *appname, int opt, const char *optarg, gboolean *start_capture)
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{
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switch(opt) {
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case 'a': /* autostop criteria */
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if (set_autostop_criterion(capture_opts, appname, optarg) == FALSE) {
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fprintf(stderr, "%s: Invalid or unknown -a flag \"%s\"\n", appname, optarg);
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exit(1);
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}
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break;
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case 'b': /* Ringbuffer option */
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capture_opts->multi_files_on = TRUE;
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if (get_ring_arguments(capture_opts, appname, optarg) == FALSE) {
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fprintf(stderr, "%s: Invalid or unknown -b arg \"%s\"\n", appname, optarg);
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exit(1);
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}
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break;
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case 'c': /* Capture xxx packets */
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capture_opts->has_autostop_packets = TRUE;
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capture_opts->autostop_packets = get_positive_int(appname, optarg, "packet count");
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break;
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case 'f': /* capture filter */
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if (capture_opts->cfilter)
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g_free(capture_opts->cfilter);
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capture_opts->cfilter = g_strdup(optarg);
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break;
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case 'H': /* Hide capture info dialog box */
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capture_opts->show_info = FALSE;
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break;
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case 'i': /* Use interface xxx */
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capture_opts->iface = g_strdup(optarg);
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break;
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case 'k': /* Start capture immediately */
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*start_capture = TRUE;
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break;
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/*case 'l':*/ /* Automatic scrolling in live capture mode */
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case 'p': /* Don't capture in promiscuous mode */
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capture_opts->promisc_mode = FALSE;
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break;
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case 'Q': /* Quit after capture (just capture to file) */
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capture_opts->quit_after_cap = TRUE;
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*start_capture = TRUE; /*** -Q implies -k !! ***/
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break;
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case 's': /* Set the snapshot (capture) length */
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capture_opts->has_snaplen = TRUE;
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capture_opts->snaplen = get_positive_int(appname, optarg, "snapshot length");
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break;
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case 'S': /* "Real-Time" mode: used for following file ala tail -f */
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capture_opts->real_time_mode = TRUE;
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break;
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case 'w': /* Write to capture file xxx */
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capture_opts->save_file = g_strdup(optarg);
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break;
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case 'y': /* Set the pcap data link type */
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#ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
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capture_opts->linktype = pcap_datalink_name_to_val(optarg);
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if (capture_opts->linktype == -1) {
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fprintf(stderr, "%s: The specified data link type \"%s\" isn't valid\n",
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appname, optarg);
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exit(1);
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}
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#else /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
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/* XXX - just treat it as a number */
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capture_opts->linktype = get_natural_int(appname, optarg, "data link type");
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#endif /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
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break;
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#ifdef _WIN32
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/* Hidden option supporting Sync mode */
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case 'Z': /* Write to pipe FD XXX */
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if (get_pipe_arguments(capture_opts, appname, optarg) == FALSE) {
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fprintf(stderr, "%s: Invalid or unknown -Z flag \"%s\"\n", appname, optarg);
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exit(1);
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}
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break;
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#endif /* _WIN32 */
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default:
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/* the caller is responsible to send us only the right opt's */
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g_assert_not_reached();
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}
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}
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#endif /* HAVE_LIBPCAP */
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