forked from osmocom/wireshark
![Jörg Mayer](/assets/img/avatar_default.png)
Fix some memleaks and overflows. I haven't committed the changes that are not bug fixes. svn path=/trunk/; revision=19777
624 lines
21 KiB
C
624 lines
21 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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* 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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#include <string.h>
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#include <ctype.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 "capture_opts.h"
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#include "ringbuffer.h"
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#include "clopts_common.h"
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#include "cmdarg_err.h"
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#include "capture-pcap-util.h"
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#include <wiretap/file_util.h>
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static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe);
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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->saving_to_file = FALSE;
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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; /* 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_write_fd = -1;
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#endif
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capture_opts->state = CAPTURE_STOPPED;
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capture_opts->output_to_pipe = FALSE;
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}
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/* log content of capture_opts */
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void
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capture_opts_log(const char *log_domain, GLogLevelFlags log_level, capture_options *capture_opts) {
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g_log(log_domain, log_level, "CAPTURE OPTIONS :");
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g_log(log_domain, log_level, "CFile : 0x%p", capture_opts->cf);
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g_log(log_domain, log_level, "Filter : %s", capture_opts->cfilter);
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g_log(log_domain, log_level, "Interface : %s", capture_opts->iface);
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#ifdef _WIN32
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g_log(log_domain, log_level, "BufferSize : %u (MB)", capture_opts->buffer_size);
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#endif
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g_log(log_domain, log_level, "SnapLen (%u): %u", capture_opts->has_snaplen, capture_opts->snaplen);
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g_log(log_domain, log_level, "Promisc : %u", capture_opts->promisc_mode);
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g_log(log_domain, log_level, "LinkType : %d", capture_opts->linktype);
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g_log(log_domain, log_level, "SavingToFile : %u", capture_opts->saving_to_file);
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g_log(log_domain, log_level, "SaveFile : %s", (capture_opts->save_file) ? capture_opts->save_file : "");
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g_log(log_domain, log_level, "RealTimeMode : %u", capture_opts->real_time_mode);
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g_log(log_domain, log_level, "ShowInfo : %u", capture_opts->show_info);
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g_log(log_domain, log_level, "QuitAfterCap : %u", capture_opts->quit_after_cap);
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g_log(log_domain, log_level, "MultiFilesOn : %u", capture_opts->multi_files_on);
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g_log(log_domain, log_level, "FileDuration (%u): %u", capture_opts->has_file_duration, capture_opts->file_duration);
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g_log(log_domain, log_level, "RingNumFiles (%u): %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files);
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g_log(log_domain, log_level, "AutostopFiles (%u): %u", capture_opts->has_autostop_files, capture_opts->autostop_files);
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g_log(log_domain, log_level, "AutostopPackets (%u): %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets);
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g_log(log_domain, log_level, "AutostopFilesize(%u): %u (KB)", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize);
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g_log(log_domain, log_level, "AutostopDuration(%u): %u", capture_opts->has_autostop_duration, capture_opts->autostop_duration);
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g_log(log_domain, log_level, "ForkChild : %d", capture_opts->fork_child);
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#ifdef _WIN32
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g_log(log_domain, log_level, "SignalPipeWrite : %d", capture_opts->signal_pipe_write_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 *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(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(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(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 *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 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(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(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(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(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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static int
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capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg)
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{
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long adapter_index;
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char *p;
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GList *if_list;
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if_info_t *if_info;
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int err;
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gchar err_str[CAPTURE_PCAP_ERRBUF_SIZE];
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gchar *cant_get_if_list_errstr;
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/*
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* If the argument is a number, treat it as an index into the list
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* of adapters, as printed by "tshark -D".
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*
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* This should be OK on UNIX systems, as interfaces shouldn't have
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* names that begin with digits. It can be useful on Windows, where
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* more than one interface can have the same name.
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*/
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adapter_index = strtol(optarg, &p, 10);
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if (p != NULL && *p == '\0') {
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if (adapter_index < 0) {
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cmdarg_err("The specified adapter index is a negative number");
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return 1;
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}
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if (adapter_index > INT_MAX) {
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cmdarg_err("The specified adapter index is too large (greater than %d)",
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INT_MAX);
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return 1;
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}
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if (adapter_index == 0) {
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cmdarg_err("there is no interface with that adapter index");
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return 1;
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}
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if_list = get_interface_list(&err, err_str);
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if (if_list == NULL) {
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switch (err) {
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case CANT_GET_INTERFACE_LIST:
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cant_get_if_list_errstr =
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cant_get_if_list_error_message(err_str);
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cmdarg_err("%s", cant_get_if_list_errstr);
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g_free(cant_get_if_list_errstr);
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break;
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case NO_INTERFACES_FOUND:
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cmdarg_err("There are no interfaces on which a capture can be done");
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break;
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}
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return 2;
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}
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if_info = g_list_nth_data(if_list, adapter_index - 1);
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if (if_info == NULL) {
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cmdarg_err("there is no interface with that adapter index");
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return 1;
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}
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capture_opts->iface = g_strdup(if_info->name);
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free_interface_list(if_list);
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} else {
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capture_opts->iface = g_strdup(optarg);
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}
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return 0;
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}
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int
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capture_opts_add_opt(capture_options *capture_opts, int opt, const char *optarg, gboolean *start_capture)
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{
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int status;
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switch(opt) {
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case 'a': /* autostop criteria */
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if (set_autostop_criterion(capture_opts, optarg) == FALSE) {
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cmdarg_err("Invalid or unknown -a flag \"%s\"", optarg);
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return 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, optarg) == FALSE) {
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cmdarg_err("Invalid or unknown -b arg \"%s\"", optarg);
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return 1;
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}
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break;
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#ifdef _WIN32
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case 'B': /* Buffer size */
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capture_opts->buffer_size = get_positive_int(optarg, "buffer size");
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break;
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#endif
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case 'c': /* Capture n packets */
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capture_opts->has_autostop_packets = TRUE;
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capture_opts->autostop_packets = get_positive_int(optarg, "packet count");
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break;
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case 'f': /* capture filter */
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if (capture_opts->has_cfilter) {
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cmdarg_err("More than one -f argument specified");
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return 1;
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}
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capture_opts->has_cfilter = TRUE;
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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 x */
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status = capture_opts_add_iface_opt(capture_opts, optarg);
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if(status != 0) {
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return status;
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}
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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(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 x */
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capture_opts->saving_to_file = TRUE;
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g_free(capture_opts->save_file);
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#if defined _WIN32 && (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
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/* since GLib 2.6, we need to convert filenames to utf8 for Win32 */
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capture_opts->save_file = g_locale_to_utf8(optarg, -1, NULL, NULL, NULL);
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#else
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capture_opts->save_file = g_strdup(optarg);
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#endif
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status = capture_opts_output_to_pipe(capture_opts->save_file, &capture_opts->output_to_pipe);
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return status;
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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 = linktype_name_to_val(optarg);
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if (capture_opts->linktype == -1) {
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cmdarg_err("The specified data link type \"%s\" isn't valid",
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optarg);
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return 1;
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}
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#else /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
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/* we can't get the type name, just treat it as a number */
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capture_opts->linktype = get_natural_int(optarg, "data link type");
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#endif /* HAVE_PCAP_DATALINK_NAME_TO_VAL */
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break;
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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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return 0;
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}
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int capture_opts_list_link_layer_types(capture_options *capture_opts)
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{
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gchar err_str[CAPTURE_PCAP_ERRBUF_SIZE];
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GList *lt_list, *lt_entry;
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data_link_info_t *data_link_info;
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/* Get the list of link-layer types for the capture device. */
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lt_list = get_pcap_linktype_list(capture_opts->iface, err_str);
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if (lt_list == NULL) {
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if (err_str[0] != '\0') {
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cmdarg_err("The list of data link types for the capture device \"%s\" could not be obtained (%s)."
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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 or pipe specified.\n", capture_opts->iface, err_str);
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} else
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cmdarg_err("The capture device \"%s\" has no data link types.", capture_opts->iface);
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return 2;
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}
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cmdarg_err_cont("Data link types (use option -y to set):");
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for (lt_entry = lt_list; lt_entry != NULL;
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lt_entry = g_list_next(lt_entry)) {
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data_link_info = lt_entry->data;
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cmdarg_err_cont(" %s", data_link_info->name);
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if (data_link_info->description != NULL)
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cmdarg_err_cont(" (%s)", data_link_info->description);
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else
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cmdarg_err_cont(" (not supported)");
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putchar('\n');
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}
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free_pcap_linktype_list(lt_list);
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return 0;
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}
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int capture_opts_list_interfaces()
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{
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GList *if_list;
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GList *if_entry;
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if_info_t *if_info;
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int err;
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gchar err_str[CAPTURE_PCAP_ERRBUF_SIZE];
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gchar *cant_get_if_list_errstr;
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int i;
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#if 0
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GSList *ip_addr;
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if_addr_t *if_addr;
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guint8 ipv4[4];
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#endif
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if_list = get_interface_list(&err, err_str);
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if (if_list == NULL) {
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switch (err) {
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case CANT_GET_INTERFACE_LIST:
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cant_get_if_list_errstr = cant_get_if_list_error_message(err_str);
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cmdarg_err("%s", cant_get_if_list_errstr);
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g_free(cant_get_if_list_errstr);
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break;
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case NO_INTERFACES_FOUND:
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cmdarg_err("There are no interfaces on which a capture can be done");
|
|
break;
|
|
}
|
|
return 2;
|
|
}
|
|
|
|
i = 1; /* Interface id number */
|
|
for (if_entry = g_list_first(if_list); if_entry != NULL;
|
|
if_entry = g_list_next(if_entry)) {
|
|
if_info = if_entry->data;
|
|
printf("%d. %s", i++, if_info->name);
|
|
if (if_info->description != NULL)
|
|
printf(" (%s)", if_info->description);
|
|
#if 0
|
|
for(ip_addr = g_slist_nth(if_info->ip_addr, 0); ip_addr != NULL;
|
|
ip_addr = g_slist_next(ip_addr)) {
|
|
if_addr = ip_addr->data;
|
|
switch(if_addr->type) {
|
|
case AT_IPv4:
|
|
memcpy(ipv4, (void *) &if_addr->ip_addr.ip4_addr, 4);
|
|
printf(" %u.%u.%u.%u", ipv4[0], ipv4[1], ipv4[2], ipv4[3]);
|
|
break;
|
|
case AT_IPv6:
|
|
/* XXX - display the IPv6 address without using stuff from epan */
|
|
printf(" XXX-IPv6");
|
|
break;
|
|
default:
|
|
printf(" unknown address type %u", if_addr->type);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
printf("\n");
|
|
}
|
|
free_interface_list(if_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void capture_opts_trim_snaplen(capture_options *capture_opts, int snaplen_min)
|
|
{
|
|
if (capture_opts->snaplen < 1)
|
|
capture_opts->snaplen = WTAP_MAX_PACKET_SIZE;
|
|
else if (capture_opts->snaplen < snaplen_min)
|
|
capture_opts->snaplen = snaplen_min;
|
|
}
|
|
|
|
|
|
void capture_opts_trim_ring_num_files(capture_options *capture_opts)
|
|
{
|
|
/* Check the value range of the ring_num_files parameter */
|
|
if (capture_opts->ring_num_files > RINGBUFFER_MAX_NUM_FILES)
|
|
capture_opts->ring_num_files = RINGBUFFER_MAX_NUM_FILES;
|
|
#if RINGBUFFER_MIN_NUM_FILES > 0
|
|
else if (capture_opts->ring_num_files < RINGBUFFER_MIN_NUM_FILES)
|
|
capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
|
|
#endif
|
|
}
|
|
|
|
|
|
gboolean capture_opts_trim_iface(capture_options *capture_opts, const char *capture_device)
|
|
{
|
|
GList *if_list;
|
|
if_info_t *if_info;
|
|
int err;
|
|
gchar err_str[CAPTURE_PCAP_ERRBUF_SIZE];
|
|
gchar *cant_get_if_list_errstr;
|
|
|
|
|
|
/* Did the user specify an interface to use? */
|
|
if (capture_opts->iface == NULL) {
|
|
/* No - is a default specified in the preferences file? */
|
|
if (capture_device != NULL) {
|
|
/* Yes - use it. */
|
|
capture_opts->iface = g_strdup(capture_device);
|
|
} else {
|
|
/* No - pick the first one from the list of interfaces. */
|
|
if_list = get_interface_list(&err, err_str);
|
|
if (if_list == NULL) {
|
|
switch (err) {
|
|
|
|
case CANT_GET_INTERFACE_LIST:
|
|
cant_get_if_list_errstr = cant_get_if_list_error_message(err_str);
|
|
cmdarg_err("%s", cant_get_if_list_errstr);
|
|
g_free(cant_get_if_list_errstr);
|
|
break;
|
|
|
|
case NO_INTERFACES_FOUND:
|
|
cmdarg_err("There are no interfaces on which a capture can be done");
|
|
break;
|
|
}
|
|
return FALSE;
|
|
}
|
|
if_info = if_list->data; /* first interface */
|
|
capture_opts->iface = g_strdup(if_info->name);
|
|
free_interface_list(if_list);
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
|
|
#ifndef S_IFIFO
|
|
#define S_IFIFO _S_IFIFO
|
|
#endif
|
|
#ifndef S_ISFIFO
|
|
#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
|
|
#endif
|
|
|
|
/* copied from filesystem.c */
|
|
static int capture_opts_test_for_fifo(const char *path)
|
|
{
|
|
struct stat statb;
|
|
|
|
if (eth_stat(path, &statb) < 0)
|
|
return errno;
|
|
|
|
if (S_ISFIFO(statb.st_mode))
|
|
return ESPIPE;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe)
|
|
{
|
|
int err;
|
|
|
|
if (save_file != NULL) {
|
|
/* We're writing to a capture file. */
|
|
if (strcmp(save_file, "-") == 0) {
|
|
/* Writing to stdout. */
|
|
/* XXX - should we check whether it's a pipe? It's arguably
|
|
silly to do "-w - >output_file" rather than "-w output_file",
|
|
but by not checking we might be violating the Principle Of
|
|
Least Astonishment. */
|
|
*is_pipe = TRUE;
|
|
} else {
|
|
/* not a capture file, test for a FIFO (aka named pipe) */
|
|
err = capture_opts_test_for_fifo(save_file);
|
|
switch (err) {
|
|
|
|
case ENOENT: /* it doesn't exist, so we'll be creating it,
|
|
and it won't be a FIFO */
|
|
case 0: /* found it, but it's not a FIFO */
|
|
break;
|
|
|
|
case ESPIPE: /* it is a FIFO */
|
|
*is_pipe = TRUE;
|
|
break;
|
|
|
|
default: /* couldn't stat it */
|
|
cmdarg_err("Error testing whether capture file is a pipe: %s",
|
|
strerror(errno));
|
|
return 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
*is_pipe = FALSE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* HAVE_LIBPCAP */
|