osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/capture_opts.c

844 lines
28 KiB
C
Raw Blame History

/* capture_opts.c
* Routines for capture options setting
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_LIBPCAP
#include <string.h>
#include <ctype.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h> /* needed to define AF_ values on UNIX */
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h> /* needed to define AF_ values on Windows */
#endif
#ifdef NEED_INET_V6DEFS_H
# include "inet_v6defs.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include "capture_opts.h"
#include "ringbuffer.h"
#include "clopts_common.h"
#include "cmdarg_err.h"
#include "capture_ifinfo.h"
#include "capture-pcap-util.h"
#include <wsutil/file_util.h>
static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe);
void
capture_opts_init(capture_options *capture_opts, void *cf)
{
capture_opts->cf = cf;
capture_opts->cfilter = g_strdup(""); /* No capture filter string specified */
capture_opts->iface = NULL; /* Default is "pick the first interface" */
capture_opts->iface_descr = NULL;
#ifdef HAVE_PCAP_REMOTE
capture_opts->src_type = CAPTURE_IFLOCAL;
capture_opts->remote_host = NULL;
capture_opts->remote_port = NULL;
capture_opts->auth_type = CAPTURE_AUTH_NULL;
capture_opts->auth_username = NULL;
capture_opts->auth_password = NULL;
capture_opts->datatx_udp = FALSE;
capture_opts->nocap_rpcap = TRUE;
capture_opts->nocap_local = FALSE;
#ifdef HAVE_PCAP_SETSAMPLING
capture_opts->sampling_method = CAPTURE_SAMP_NONE;
capture_opts->sampling_param = 0;
#endif
#endif
#if defined(_WIN32) || defined(HAVE_PCAP_SET_BUFFER_SIZE)
capture_opts->buffer_size = 1; /* 1 MB */
#endif
capture_opts->has_snaplen = FALSE;
capture_opts->snaplen = WTAP_MAX_PACKET_SIZE; /* snapshot length - default is
infinite, in effect */
capture_opts->promisc_mode = TRUE; /* promiscuous mode is the default */
capture_opts->linktype = -1; /* the default linktype */
capture_opts->saving_to_file = FALSE;
capture_opts->save_file = NULL;
capture_opts->use_pcapng = FALSE; /* the default is pcap */
capture_opts->real_time_mode = TRUE;
capture_opts->show_info = TRUE;
capture_opts->quit_after_cap = FALSE;
capture_opts->restart = FALSE;
capture_opts->multi_files_on = FALSE;
capture_opts->has_file_duration = FALSE;
capture_opts->file_duration = 60; /* 1 min */
capture_opts->has_ring_num_files = FALSE;
capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES;
capture_opts->has_autostop_files = FALSE;
capture_opts->autostop_files = 1;
capture_opts->has_autostop_packets = FALSE;
capture_opts->autostop_packets = 0;
capture_opts->has_autostop_filesize = FALSE;
capture_opts->autostop_filesize = 1024; /* 1 MB */
capture_opts->has_autostop_duration = FALSE;
capture_opts->autostop_duration = 60; /* 1 min */
capture_opts->fork_child = -1; /* invalid process handle */
#ifdef _WIN32
capture_opts->signal_pipe_write_fd = -1;
#endif
capture_opts->state = CAPTURE_STOPPED;
capture_opts->output_to_pipe = FALSE;
#ifndef _WIN32
capture_opts->owner = getuid();
capture_opts->group = getgid();
#endif
}
/* log content of capture_opts */
void
capture_opts_log(const char *log_domain, GLogLevelFlags log_level, capture_options *capture_opts) {
g_log(log_domain, log_level, "CAPTURE OPTIONS :");
g_log(log_domain, log_level, "CFile : 0x%p", capture_opts->cf);
g_log(log_domain, log_level, "Filter : %s", capture_opts->cfilter);
g_log(log_domain, log_level, "Interface : %s", capture_opts->iface);
/* iface_descr may not been filled in and some C Libraries hate a null ptr for %s */
g_log(log_domain, log_level, "Interface Descr : %s",
capture_opts->iface_descr ? capture_opts->iface_descr : "<null>");
#ifdef HAVE_PCAP_REMOTE
g_log(log_domain, log_level, "Capture source : %s",
capture_opts->src_type == CAPTURE_IFLOCAL ? "Local interface" :
capture_opts->src_type == CAPTURE_IFREMOTE ? "Remote interface" :
"Unknown");
if (capture_opts->src_type == CAPTURE_IFREMOTE) {
g_log(log_domain, log_level, "Remote host : %s", capture_opts->remote_host);
g_log(log_domain, log_level, "Remote port : %s", capture_opts->remote_port);
}
g_log(log_domain, log_level, "Authentication : %s",
capture_opts->auth_type == CAPTURE_AUTH_NULL ? "Null" :
capture_opts->auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
"Unknown");
if (capture_opts->auth_type == CAPTURE_AUTH_PWD) {
g_log(log_domain, log_level, "Auth username : %s", capture_opts->auth_password);
g_log(log_domain, log_level, "Auth password : <hidden>");
}
g_log(log_domain, log_level, "UDP data transfer : %u", capture_opts->datatx_udp);
g_log(log_domain, log_level, "No capture RPCAP : %u", capture_opts->nocap_rpcap);
g_log(log_domain, log_level, "No capture local : %u", capture_opts->nocap_local);
#endif
#if defined(_WIN32) || defined(HAVE_PCAP_SET_BUFFER_SIZE)
g_log(log_domain, log_level, "BufferSize : %u (MB)", capture_opts->buffer_size);
#endif
g_log(log_domain, log_level, "SnapLen (%u): %u", capture_opts->has_snaplen, capture_opts->snaplen);
g_log(log_domain, log_level, "Promisc : %u", capture_opts->promisc_mode);
g_log(log_domain, log_level, "LinkType : %d", capture_opts->linktype);
g_log(log_domain, log_level, "SavingToFile : %u", capture_opts->saving_to_file);
g_log(log_domain, log_level, "SaveFile : %s", (capture_opts->save_file) ? capture_opts->save_file : "");
g_log(log_domain, log_level, "Fileformat : %s", (capture_opts->use_pcapng) ? "PCAPNG" : "PCAP");
g_log(log_domain, log_level, "RealTimeMode : %u", capture_opts->real_time_mode);
g_log(log_domain, log_level, "ShowInfo : %u", capture_opts->show_info);
g_log(log_domain, log_level, "QuitAfterCap : %u", capture_opts->quit_after_cap);
g_log(log_domain, log_level, "MultiFilesOn : %u", capture_opts->multi_files_on);
g_log(log_domain, log_level, "FileDuration (%u): %u", capture_opts->has_file_duration, capture_opts->file_duration);
g_log(log_domain, log_level, "RingNumFiles (%u): %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files);
g_log(log_domain, log_level, "AutostopFiles (%u): %u", capture_opts->has_autostop_files, capture_opts->autostop_files);
g_log(log_domain, log_level, "AutostopPackets (%u): %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets);
g_log(log_domain, log_level, "AutostopFilesize(%u): %u (KB)", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize);
g_log(log_domain, log_level, "AutostopDuration(%u): %u", capture_opts->has_autostop_duration, capture_opts->autostop_duration);
g_log(log_domain, log_level, "ForkChild : %d", capture_opts->fork_child);
#ifdef _WIN32
g_log(log_domain, log_level, "SignalPipeWrite : %d", capture_opts->signal_pipe_write_fd);
#endif
}
/*
* Given a string of the form "<autostop criterion>:<value>", as might appear
* as an argument to a "-a" option, parse it and set the criterion in
* question. Return an indication of whether it succeeded or failed
* in some fashion.
*/
static gboolean
set_autostop_criterion(capture_options *capture_opts, const char *autostoparg)
{
gchar *p, *colonp;
colonp = strchr(autostoparg, ':');
if (colonp == NULL)
return FALSE;
p = colonp;
*p++ = '\0';
/*
* Skip over any white space (there probably won't be any, but
* as we allow it in the preferences file, we might as well
* allow it here).
*/
while (isspace((guchar)*p))
p++;
if (*p == '\0') {
/*
* Put the colon back, so if our caller uses, in an
* error message, the string they passed us, the message
* looks correct.
*/
*colonp = ':';
return FALSE;
}
if (strcmp(autostoparg,"duration") == 0) {
capture_opts->has_autostop_duration = TRUE;
capture_opts->autostop_duration = get_positive_int(p,"autostop duration");
} else if (strcmp(autostoparg,"filesize") == 0) {
capture_opts->has_autostop_filesize = TRUE;
capture_opts->autostop_filesize = get_positive_int(p,"autostop filesize");
} else if (strcmp(autostoparg,"files") == 0) {
capture_opts->multi_files_on = TRUE;
capture_opts->has_autostop_files = TRUE;
capture_opts->autostop_files = get_positive_int(p,"autostop files");
} else {
return FALSE;
}
*colonp = ':'; /* put the colon back */
return TRUE;
}
/*
* Given a string of the form "<ring buffer file>:<duration>", as might appear
* as an argument to a "-b" option, parse it and set the arguments in
* question. Return an indication of whether it succeeded or failed
* in some fashion.
*/
static gboolean
get_ring_arguments(capture_options *capture_opts, const char *arg)
{
gchar *p = NULL, *colonp;
colonp = strchr(arg, ':');
if (colonp == NULL)
return FALSE;
p = colonp;
*p++ = '\0';
/*
* Skip over any white space (there probably won't be any, but
* as we allow it in the preferences file, we might as well
* allow it here).
*/
while (isspace((guchar)*p))
p++;
if (*p == '\0') {
/*
* Put the colon back, so if our caller uses, in an
* error message, the string they passed us, the message
* looks correct.
*/
*colonp = ':';
return FALSE;
}
if (strcmp(arg,"files") == 0) {
capture_opts->has_ring_num_files = TRUE;
capture_opts->ring_num_files = get_natural_int(p, "number of ring buffer files");
} else if (strcmp(arg,"filesize") == 0) {
capture_opts->has_autostop_filesize = TRUE;
capture_opts->autostop_filesize = get_positive_int(p, "ring buffer filesize");
} else if (strcmp(arg,"duration") == 0) {
capture_opts->has_file_duration = TRUE;
capture_opts->file_duration = get_positive_int(p, "ring buffer duration");
}
*colonp = ':'; /* put the colon back */
return TRUE;
}
#ifdef HAVE_PCAP_SETSAMPLING
/*
* Given a string of the form "<sampling type>:<value>", as might appear
* as an argument to a "-m" option, parse it and set the arguments in
* question. Return an indication of whether it succeeded or failed
* in some fashion.
*/
static gboolean
get_sampling_arguments(capture_options *capture_opts, const char *arg)
{
gchar *p = NULL, *colonp;
colonp = strchr(arg, ':');
if (colonp == NULL)
return FALSE;
p = colonp;
*p++ = '\0';
while (isspace((guchar)*p))
p++;
if (*p == '\0') {
*colonp = ':';
return FALSE;
}
if (strcmp(arg, "count") == 0) {
capture_opts->sampling_method = CAPTURE_SAMP_BY_COUNT;
capture_opts->sampling_param = get_positive_int(p, "sampling count");
} else if (strcmp(arg, "timer") == 0) {
capture_opts->sampling_method = CAPTURE_SAMP_BY_TIMER;
capture_opts->sampling_param = get_positive_int(p, "sampling timer");
}
*colonp = ':';
return TRUE;
}
#endif
#ifdef HAVE_PCAP_REMOTE
/*
* Given a string of the form "<username>:<password>", as might appear
* as an argument to a "-A" option, parse it and set the arguments in
* question. Return an indication of whether it succeeded or failed
* in some fashion.
*/
static gboolean
get_auth_arguments(capture_options *capture_opts, const char *arg)
{
gchar *p = NULL, *colonp;
colonp = strchr(arg, ':');
if (colonp == NULL)
return FALSE;
p = colonp;
*p++ = '\0';
while (isspace((guchar)*p))
p++;
capture_opts->auth_type = CAPTURE_AUTH_PWD;
capture_opts->auth_username = g_strdup(arg);
capture_opts->auth_password = g_strdup(p);
*colonp = ':';
return TRUE;
}
#endif
static int
capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg_str_p)
{
long adapter_index;
char *p;
GList *if_list;
if_info_t *if_info;
int err;
gchar *err_str;
/*
* If the argument is a number, treat it as an index into the list
* of adapters, as printed by "tshark -D".
*
* This should be OK on UNIX systems, as interfaces shouldn't have
* names that begin with digits. It can be useful on Windows, where
* more than one interface can have the same name.
*/
adapter_index = strtol(optarg_str_p, &p, 10);
if (p != NULL && *p == '\0') {
if (adapter_index < 0) {
cmdarg_err("The specified adapter index is a negative number");
return 1;
}
if (adapter_index > INT_MAX) {
cmdarg_err("The specified adapter index is too large (greater than %d)",
INT_MAX);
return 1;
}
if (adapter_index == 0) {
cmdarg_err("There is no interface with that adapter index");
return 1;
}
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 2;
}
if_info = (if_info_t *)g_list_nth_data(if_list, adapter_index - 1);
if (if_info == NULL) {
cmdarg_err("There is no interface with that adapter index");
return 1;
}
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);
} else {
capture_opts->iface = g_strdup(optarg_str_p);
}
return 0;
}
int
capture_opts_add_opt(capture_options *capture_opts, int opt, const char *optarg_str_p, gboolean *start_capture)
{
int status;
switch(opt) {
case 'a': /* autostop criteria */
if (set_autostop_criterion(capture_opts, optarg_str_p) == FALSE) {
cmdarg_err("Invalid or unknown -a flag \"%s\"", optarg_str_p);
return 1;
}
break;
#ifdef HAVE_PCAP_REMOTE
case 'A':
if (get_auth_arguments(capture_opts, optarg_str_p) == FALSE) {
cmdarg_err("Invalid or unknown -A arg \"%s\"", optarg_str_p);
return 1;
}
break;
#endif
case 'b': /* Ringbuffer option */
capture_opts->multi_files_on = TRUE;
if (get_ring_arguments(capture_opts, optarg_str_p) == FALSE) {
cmdarg_err("Invalid or unknown -b arg \"%s\"", optarg_str_p);
return 1;
}
break;
#if defined(_WIN32) || defined(HAVE_PCAP_SET_BUFFER_SIZE)
case 'B': /* Buffer size */
capture_opts->buffer_size = get_positive_int(optarg_str_p, "buffer size");
break;
#endif
case 'c': /* Capture n packets */
capture_opts->has_autostop_packets = TRUE;
capture_opts->autostop_packets = get_positive_int(optarg_str_p, "packet count");
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;
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;
}
/*
* If you change the output format of this function, you MUST update
* capture_sync.c:sync_linktype_list_open() accordingly!
*/
int
capture_opts_list_link_layer_types(capture_options *capture_opts, gboolean machine_readable)
{
gchar *err_str;
const gchar *desc_str;
GList *lt_list, *lt_entry;
data_link_info_t *data_link_info;
/* Get the list of link-layer types for the capture device. */
lt_list = get_pcap_linktype_list(capture_opts->iface, &err_str);
if (lt_list == NULL) {
if (err_str != NULL) {
cmdarg_err("The list of data link types for the capture device \"%s\" could not be obtained (%s)."
"Please check to make sure you have sufficient permissions, and that\n"
"you have the proper interface or pipe specified.\n", capture_opts->iface, err_str);
g_free(err_str);
} else
cmdarg_err("The capture device \"%s\" has no data link types.", capture_opts->iface);
return 2;
}
if (machine_readable) { /* tab-separated values to stdout */
for (lt_entry = lt_list; lt_entry != NULL; lt_entry = g_list_next(lt_entry)) {
data_link_info = (data_link_info_t *)lt_entry->data;
if (data_link_info->description != NULL)
desc_str = data_link_info->description;
else
desc_str = "(not supported)";
printf("%d\t%s\t%s\n", data_link_info->dlt, data_link_info->name,
desc_str);
}
} else {
cmdarg_err_cont("Data link types (use option -y to set):");
for (lt_entry = lt_list; lt_entry != NULL;
lt_entry = g_list_next(lt_entry)) {
data_link_info = (data_link_info_t *)lt_entry->data;
cmdarg_err_cont(" %s", data_link_info->name);
if (data_link_info->description != NULL)
cmdarg_err_cont(" (%s)", data_link_info->description);
else
cmdarg_err_cont(" (not supported)");
putchar('\n');
}
}
free_pcap_linktype_list(lt_list);
return 0;
}
/* Return an ASCII-formatted list of interfaces. */
#define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */
int
capture_opts_list_interfaces(gboolean machine_readable)
{
GList *if_list;
GList *if_entry;
if_info_t *if_info;
int err;
gchar *err_str;
int i;
GSList *addr;
if_addr_t *if_addr;
char addr_str[ADDRSTRLEN];
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 err;
}
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);
if (!machine_readable) {
/* Add the description if it exists */
if (if_info->description != NULL)
printf(" (%s)", if_info->description);
} else {
/*
* Add the contents of the if_entry struct in a parseable format.
* Each if_entry element is tab-separated. Addresses are comma-
* separated.
*/
/* XXX - Make sure our description doesn't contain a tab */
if (if_info->description != NULL)
printf("\t%s\t", if_info->description);
else
printf("\t\t");
for(addr = g_slist_nth(if_info->addrs, 0); addr != NULL;
addr = g_slist_next(addr)) {
if (addr != g_slist_nth(if_info->addrs, 0))
printf(",");
if_addr = (if_addr_t *)addr->data;
switch(if_addr->ifat_type) {
case IF_AT_IPv4:
if (inet_ntop(AF_INET, &if_addr->addr.ip4_addr, addr_str,
ADDRSTRLEN)) {
printf("%s", addr_str);
} else {
printf("<unknown IPv4>");
}
break;
case IF_AT_IPv6:
if (inet_ntop(AF_INET6, &if_addr->addr.ip6_addr,
addr_str, ADDRSTRLEN)) {
printf("%s", addr_str);
} else {
printf("<unknown IPv6>");
}
break;
default:
printf("<type unknown %u>", if_addr->ifat_type);
}
}
if (if_info->loopback)
printf("\tloopback");
else
printf("\tnetwork");
}
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;
/* 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 */
View Git Blame Copy Permalink