![Gerald Combs](/assets/img/avatar_default.png)
Add RINGBUFFER_WARN_NUM_FILES and use it to print a warning. Print warnings when we change the number of ringbuffer files. svn path=/trunk/; revision=32998
732 lines
25 KiB
C
732 lines
25 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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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <glib.h>
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#include <epan/packet.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 "console_io.h"
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#include "cmdarg_err.h"
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#include "capture_ifinfo.h"
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#include "capture-pcap-util.h"
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#include <wsutil/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 *cf)
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{
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capture_opts->cf = cf;
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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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capture_opts->iface_descr = NULL;
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#ifdef HAVE_PCAP_REMOTE
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capture_opts->src_type = CAPTURE_IFLOCAL;
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capture_opts->remote_host = NULL;
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capture_opts->remote_port = NULL;
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capture_opts->auth_type = CAPTURE_AUTH_NULL;
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capture_opts->auth_username = NULL;
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capture_opts->auth_password = NULL;
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capture_opts->datatx_udp = FALSE;
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capture_opts->nocap_rpcap = TRUE;
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capture_opts->nocap_local = FALSE;
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#ifdef HAVE_PCAP_SETSAMPLING
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capture_opts->sampling_method = CAPTURE_SAMP_NONE;
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capture_opts->sampling_param = 0;
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#endif
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#endif
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#if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
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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->monitor_mode = FALSE;
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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->use_pcapng = FALSE; /* the default is pcap */
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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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#ifndef _WIN32
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capture_opts->owner = getuid();
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capture_opts->group = getgid();
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#endif
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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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/* iface_descr may not been filled in and some C Libraries hate a null ptr for %s */
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g_log(log_domain, log_level, "Interface Descr : %s",
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capture_opts->iface_descr ? capture_opts->iface_descr : "<null>");
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#ifdef HAVE_PCAP_REMOTE
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g_log(log_domain, log_level, "Capture source : %s",
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capture_opts->src_type == CAPTURE_IFLOCAL ? "Local interface" :
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capture_opts->src_type == CAPTURE_IFREMOTE ? "Remote interface" :
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"Unknown");
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if (capture_opts->src_type == CAPTURE_IFREMOTE) {
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g_log(log_domain, log_level, "Remote host : %s", capture_opts->remote_host);
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g_log(log_domain, log_level, "Remote port : %s", capture_opts->remote_port);
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}
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g_log(log_domain, log_level, "Authentication : %s",
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capture_opts->auth_type == CAPTURE_AUTH_NULL ? "Null" :
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capture_opts->auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
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"Unknown");
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if (capture_opts->auth_type == CAPTURE_AUTH_PWD) {
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g_log(log_domain, log_level, "Auth username : %s", capture_opts->auth_password);
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g_log(log_domain, log_level, "Auth password : <hidden>");
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}
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g_log(log_domain, log_level, "UDP data transfer : %u", capture_opts->datatx_udp);
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g_log(log_domain, log_level, "No capture RPCAP : %u", capture_opts->nocap_rpcap);
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g_log(log_domain, log_level, "No capture local : %u", capture_opts->nocap_local);
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#endif
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#if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
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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, "Fileformat : %s", (capture_opts->use_pcapng) ? "PCAPNG" : "PCAP");
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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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#ifdef HAVE_PCAP_SETSAMPLING
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/*
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* Given a string of the form "<sampling type>:<value>", as might appear
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* as an argument to a "-m" 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_sampling_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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while (isspace((guchar)*p))
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p++;
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if (*p == '\0') {
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*colonp = ':';
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return FALSE;
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}
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if (strcmp(arg, "count") == 0) {
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capture_opts->sampling_method = CAPTURE_SAMP_BY_COUNT;
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capture_opts->sampling_param = get_positive_int(p, "sampling count");
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} else if (strcmp(arg, "timer") == 0) {
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capture_opts->sampling_method = CAPTURE_SAMP_BY_TIMER;
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capture_opts->sampling_param = get_positive_int(p, "sampling timer");
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}
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*colonp = ':';
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return TRUE;
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}
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#endif
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#ifdef HAVE_PCAP_REMOTE
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/*
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* Given a string of the form "<username>:<password>", as might appear
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* as an argument to a "-A" 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_auth_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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while (isspace((guchar)*p))
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p++;
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capture_opts->auth_type = CAPTURE_AUTH_PWD;
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capture_opts->auth_username = g_strdup(arg);
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capture_opts->auth_password = g_strdup(p);
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*colonp = ':';
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return TRUE;
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}
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#endif
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static int
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capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg_str_p)
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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;
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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_str_p, &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 = capture_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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cmdarg_err("%s", err_str);
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g_free(err_str);
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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 = (if_info_t *)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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/* We don't set iface_descr here because doing so requires
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* capture_ui_utils.c which requires epan/prefs.c which is
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* probably a bit too much dependency for here...
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*/
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free_interface_list(if_list);
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} else {
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capture_opts->iface = g_strdup(optarg_str_p);
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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_str_p, 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_str_p) == FALSE) {
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cmdarg_err("Invalid or unknown -a flag \"%s\"", optarg_str_p);
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return 1;
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}
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break;
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#ifdef HAVE_PCAP_REMOTE
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case 'A':
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if (get_auth_arguments(capture_opts, optarg_str_p) == FALSE) {
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cmdarg_err("Invalid or unknown -A arg \"%s\"", optarg_str_p);
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return 1;
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}
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break;
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#endif
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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_str_p) == FALSE) {
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cmdarg_err("Invalid or unknown -b arg \"%s\"", optarg_str_p);
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return 1;
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}
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break;
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#if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
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case 'B': /* Buffer size */
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capture_opts->buffer_size = get_positive_int(optarg_str_p, "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_str_p, "packet count");
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break;
|
|
case 'f': /* capture filter */
|
|
if (capture_opts->has_cfilter) {
|
|
cmdarg_err("More than one -f argument specified");
|
|
return 1;
|
|
}
|
|
capture_opts->has_cfilter = TRUE;
|
|
g_free(capture_opts->cfilter);
|
|
capture_opts->cfilter = g_strdup(optarg_str_p);
|
|
break;
|
|
case 'H': /* Hide capture info dialog box */
|
|
capture_opts->show_info = FALSE;
|
|
break;
|
|
case 'i': /* Use interface x */
|
|
status = capture_opts_add_iface_opt(capture_opts, optarg_str_p);
|
|
if(status != 0) {
|
|
return status;
|
|
}
|
|
break;
|
|
#ifdef HAVE_PCAP_CREATE
|
|
case 'I': /* Capture in monitor mode */
|
|
capture_opts->monitor_mode = TRUE;
|
|
break;
|
|
#endif
|
|
case 'k': /* Start capture immediately */
|
|
*start_capture = TRUE;
|
|
break;
|
|
/*case 'l':*/ /* Automatic scrolling in live capture mode */
|
|
#ifdef HAVE_PCAP_SETSAMPLING
|
|
case 'm':
|
|
if (get_sampling_arguments(capture_opts, optarg_str_p) == FALSE) {
|
|
cmdarg_err("Invalid or unknown -m arg \"%s\"", optarg_str_p);
|
|
return 1;
|
|
}
|
|
break;
|
|
#endif
|
|
case 'n': /* Use pcapng format */
|
|
capture_opts->use_pcapng = TRUE;
|
|
break;
|
|
case 'p': /* Don't capture in promiscuous mode */
|
|
capture_opts->promisc_mode = FALSE;
|
|
break;
|
|
case 'Q': /* Quit after capture (just capture to file) */
|
|
capture_opts->quit_after_cap = TRUE;
|
|
*start_capture = TRUE; /*** -Q implies -k !! ***/
|
|
break;
|
|
#ifdef HAVE_PCAP_REMOTE
|
|
case 'r':
|
|
capture_opts->nocap_rpcap = FALSE;
|
|
break;
|
|
#endif
|
|
case 's': /* Set the snapshot (capture) length */
|
|
capture_opts->has_snaplen = TRUE;
|
|
capture_opts->snaplen = get_natural_int(optarg_str_p, "snapshot length");
|
|
/*
|
|
* Make a snapshot length of 0 equivalent to the maximum packet
|
|
* length, mirroring what tcpdump does.
|
|
*/
|
|
if (capture_opts->snaplen == 0)
|
|
capture_opts->snaplen = WTAP_MAX_PACKET_SIZE;
|
|
break;
|
|
case 'S': /* "Real-Time" mode: used for following file ala tail -f */
|
|
capture_opts->real_time_mode = TRUE;
|
|
break;
|
|
#ifdef HAVE_PCAP_REMOTE
|
|
case 'u':
|
|
capture_opts->datatx_udp = TRUE;
|
|
break;
|
|
#endif
|
|
case 'w': /* Write to capture file x */
|
|
capture_opts->saving_to_file = TRUE;
|
|
g_free(capture_opts->save_file);
|
|
#if defined _WIN32 && GLIB_CHECK_VERSION(2,6,0)
|
|
/* since GLib 2.6, we need to convert filenames to utf8 for Win32 */
|
|
capture_opts->save_file = g_locale_to_utf8(optarg_str_p, -1, NULL, NULL, NULL);
|
|
#else
|
|
capture_opts->save_file = g_strdup(optarg_str_p);
|
|
#endif
|
|
status = capture_opts_output_to_pipe(capture_opts->save_file, &capture_opts->output_to_pipe);
|
|
return status;
|
|
case 'y': /* Set the pcap data link type */
|
|
capture_opts->linktype = linktype_name_to_val(optarg_str_p);
|
|
if (capture_opts->linktype == -1) {
|
|
cmdarg_err("The specified data link type \"%s\" isn't valid",
|
|
optarg_str_p);
|
|
return 1;
|
|
}
|
|
break;
|
|
default:
|
|
/* the caller is responsible to send us only the right opt's */
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
capture_opts_print_if_capabilities(if_capabilities_t *caps,
|
|
gboolean monitor_mode)
|
|
{
|
|
GList *lt_entry;
|
|
data_link_info_t *data_link_info;
|
|
|
|
if (caps->can_set_rfmon)
|
|
fprintf_stderr("Data link types when %sin monitor mode (use option -y to set):\n",
|
|
monitor_mode ? "" : "not ");
|
|
else
|
|
fprintf_stderr("Data link types (use option -y to set):\n");
|
|
for (lt_entry = caps->data_link_types; lt_entry != NULL;
|
|
lt_entry = g_list_next(lt_entry)) {
|
|
data_link_info = (data_link_info_t *)lt_entry->data;
|
|
fprintf_stderr(" %s", data_link_info->name);
|
|
if (data_link_info->description != NULL)
|
|
fprintf_stderr(" (%s)", data_link_info->description);
|
|
else
|
|
fprintf_stderr(" (not supported)");
|
|
fprintf_stderr("\n");
|
|
}
|
|
}
|
|
|
|
/* Print an ASCII-formatted list of interfaces. */
|
|
void
|
|
capture_opts_print_interfaces(GList *if_list)
|
|
{
|
|
int i;
|
|
GList *if_entry;
|
|
if_info_t *if_info;
|
|
|
|
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_info_t *)if_entry->data;
|
|
printf("%d. %s", i++, if_info->name);
|
|
|
|
/* Print the description if it exists */
|
|
if (if_info->description != NULL)
|
|
printf(" (%s)", if_info->description);
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
|
|
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) {
|
|
cmdarg_err("Too many ring buffer files (%u). Reducing to %u.\n", capture_opts->ring_num_files, RINGBUFFER_MAX_NUM_FILES);
|
|
capture_opts->ring_num_files = RINGBUFFER_MAX_NUM_FILES;
|
|
} else if (capture_opts->ring_num_files > RINGBUFFER_WARN_NUM_FILES) {
|
|
cmdarg_err("%u is a lot of ring buffer files.\n", capture_opts->ring_num_files);
|
|
}
|
|
#if RINGBUFFER_MIN_NUM_FILES > 0
|
|
else if (capture_opts->ring_num_files < RINGBUFFER_MIN_NUM_FILES)
|
|
cmdarg_err("Too few ring buffer files (%u). Increasing to %u.\n", 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;
|
|
|
|
|
|
/* 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);
|
|
/* We don't set iface_descr here because doing so requires
|
|
* capture_ui_utils.c which requires epan/prefs.c which is
|
|
* probably a bit too much dependency for here...
|
|
*/
|
|
} else {
|
|
/* No - pick the first one from the list of interfaces. */
|
|
if_list = capture_interface_list(&err, &err_str);
|
|
if (if_list == NULL) {
|
|
switch (err) {
|
|
|
|
case CANT_GET_INTERFACE_LIST:
|
|
cmdarg_err("%s", err_str);
|
|
g_free(err_str);
|
|
break;
|
|
|
|
case NO_INTERFACES_FOUND:
|
|
cmdarg_err("There are no interfaces on which a capture can be done");
|
|
break;
|
|
}
|
|
return FALSE;
|
|
}
|
|
if_info = (if_info_t *)if_list->data; /* first interface */
|
|
capture_opts->iface = g_strdup(if_info->name);
|
|
/* We don't set iface_descr here because doing so requires
|
|
* capture_ui_utils.c which requires epan/prefs.c which is
|
|
* probably a bit too much dependency for here...
|
|
*/
|
|
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 (ws_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;
|
|
|
|
*is_pipe = FALSE;
|
|
|
|
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 writing to stdout, 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 */
|
|
break; /* ignore: later attempt to open */
|
|
/* will generate a nice msg */
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* HAVE_LIBPCAP */
|