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capture_opts.c
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capture_opts.c
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/* capture_opts.c
* Routines for capture options setting
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <[email protected]>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#include <wireshark.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_LIBPCAP
#include <errno.h>
#include <ws_exit_codes.h>
#include "capture_opts.h"
#include "ringbuffer.h"
#include <wsutil/clopts_common.h>
#include <wsutil/cmdarg_err.h>
#include <wsutil/file_util.h>
#include <wsutil/ws_pipe.h>
#include <wsutil/ws_assert.h>
#ifdef _WIN32
#include <wsutil/win32-utils.h>
#endif
#include "capture/capture_ifinfo.h"
#include "capture/capture-pcap-util.h"
static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe);
void
capture_opts_init(capture_options *capture_opts, GList *(*get_iface_list)(int *, gchar **))
{
capture_opts->get_iface_list = get_iface_list;
capture_opts->ifaces = g_array_new(FALSE, FALSE, sizeof(interface_options));
capture_opts->all_ifaces = g_array_new(FALSE, FALSE, sizeof(interface_t));
capture_opts->num_selected = 0;
capture_opts->default_options.name = NULL;
capture_opts->default_options.descr = NULL;
capture_opts->default_options.ifname = NULL;
capture_opts->default_options.hardware = NULL;
capture_opts->default_options.display_name = NULL;
capture_opts->default_options.cfilter = NULL;
capture_opts->default_options.has_snaplen = FALSE;
capture_opts->default_options.snaplen = WTAP_MAX_PACKET_SIZE_STANDARD;
capture_opts->default_options.linktype = -1; /* use interface default */
capture_opts->default_options.promisc_mode = TRUE;
capture_opts->default_options.if_type = IF_WIRED;
capture_opts->default_options.extcap = NULL;
capture_opts->default_options.extcap_fifo = NULL;
capture_opts->default_options.extcap_args = NULL;
capture_opts->default_options.extcap_pid = WS_INVALID_PID;
capture_opts->default_options.extcap_pipedata = NULL;
capture_opts->default_options.extcap_stderr = NULL;
capture_opts->default_options.extcap_stdout_watch = 0;
capture_opts->default_options.extcap_stderr_watch = 0;
#ifdef _WIN32
capture_opts->default_options.extcap_pipe_h = INVALID_HANDLE_VALUE;
capture_opts->default_options.extcap_control_in_h = INVALID_HANDLE_VALUE;
capture_opts->default_options.extcap_control_out_h = INVALID_HANDLE_VALUE;
#endif
capture_opts->default_options.extcap_control_in = NULL;
capture_opts->default_options.extcap_control_out = NULL;
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
capture_opts->default_options.buffer_size = DEFAULT_CAPTURE_BUFFER_SIZE;
#endif
capture_opts->default_options.monitor_mode = FALSE;
#ifdef HAVE_PCAP_REMOTE
capture_opts->default_options.src_type = CAPTURE_IFLOCAL;
capture_opts->default_options.remote_host = NULL;
capture_opts->default_options.remote_port = NULL;
capture_opts->default_options.auth_type = CAPTURE_AUTH_NULL;
capture_opts->default_options.auth_username = NULL;
capture_opts->default_options.auth_password = NULL;
capture_opts->default_options.datatx_udp = FALSE;
capture_opts->default_options.nocap_rpcap = TRUE;
capture_opts->default_options.nocap_local = FALSE;
#endif
#ifdef HAVE_PCAP_SETSAMPLING
capture_opts->default_options.sampling_method = CAPTURE_SAMP_NONE;
capture_opts->default_options.sampling_param = 0;
#endif
capture_opts->default_options.timestamp_type = NULL;
capture_opts->saving_to_file = FALSE;
capture_opts->save_file = NULL;
capture_opts->group_read_access = FALSE;
capture_opts->use_pcapng = TRUE; /* Save as pcapng by default */
capture_opts->update_interval = DEFAULT_UPDATE_INTERVAL; /* 100 ms */
capture_opts->real_time_mode = TRUE;
capture_opts->show_info = TRUE;
capture_opts->restart = FALSE;
capture_opts->orig_save_file = NULL;
capture_opts->multi_files_on = FALSE;
capture_opts->has_file_duration = FALSE;
capture_opts->file_duration = 60.0; /* 1 min */
capture_opts->has_file_interval = FALSE;
capture_opts->has_nametimenum = FALSE;
capture_opts->file_interval = 60; /* 1 min */
capture_opts->has_file_packets = FALSE;
capture_opts->file_packets = 0;
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_written_packets = FALSE;
capture_opts->autostop_written_packets = 0;
capture_opts->has_autostop_filesize = FALSE;
capture_opts->autostop_filesize = 1000; /* 1 MB */
capture_opts->has_autostop_duration = FALSE;
capture_opts->autostop_duration = 60.0; /* 1 min */
capture_opts->output_to_pipe = FALSE;
capture_opts->capture_child = FALSE;
capture_opts->stop_after_extcaps = FALSE;
capture_opts->wait_for_extcap_cbs = FALSE;
capture_opts->print_file_names = FALSE;
capture_opts->print_name_to = NULL;
capture_opts->temp_dir = NULL;
capture_opts->compress_type = NULL;
capture_opts->closed_msg = NULL;
capture_opts->extcap_terminate_id = 0;
capture_opts->capture_filters_list = NULL;
}
void
capture_opts_cleanup(capture_options *capture_opts)
{
if (!capture_opts)
return;
if (capture_opts->ifaces) {
while (capture_opts->ifaces->len > 0) {
capture_opts_del_iface(capture_opts, 0);
}
g_array_free(capture_opts->ifaces, TRUE);
capture_opts->ifaces = NULL;
}
if (capture_opts->all_ifaces) {
while (capture_opts->all_ifaces->len > 0) {
interface_t *device = &g_array_index(capture_opts->all_ifaces, interface_t, 0);
capture_opts_free_interface_t(device);
capture_opts->all_ifaces = g_array_remove_index(capture_opts->all_ifaces, 0);
}
g_array_free(capture_opts->all_ifaces, TRUE);
capture_opts->all_ifaces = NULL;
}
g_free(capture_opts->save_file);
g_free(capture_opts->temp_dir);
if (capture_opts->closed_msg) {
g_free(capture_opts->closed_msg);
capture_opts->closed_msg = NULL;
}
if (capture_opts->extcap_terminate_id > 0) {
g_source_remove(capture_opts->extcap_terminate_id);
capture_opts->extcap_terminate_id = 0;
}
if (capture_opts->capture_filters_list) {
ws_filter_list_free(capture_opts->capture_filters_list);
capture_opts->capture_filters_list = NULL;
}
}
/* log content of capture_opts */
void
capture_opts_log(const char *log_domain, enum ws_log_level log_level, capture_options *capture_opts) {
guint i;
ws_log(log_domain, log_level, "CAPTURE OPTIONS :");
for (i = 0; i < capture_opts->ifaces->len; i++) {
interface_options *interface_opts;
interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i);
ws_log(log_domain, log_level, "Interface name[%02d] : %s", i, interface_opts->name ? interface_opts->name : "(unspecified)");
ws_log(log_domain, log_level, "Interface description[%02d] : %s", i, interface_opts->descr ? interface_opts->descr : "(unspecified)");
ws_log(log_domain, log_level, "Interface vendor description[%02d] : %s", i, interface_opts->hardware ? interface_opts->hardware : "(unspecified)");
ws_log(log_domain, log_level, "Display name[%02d]: %s", i, interface_opts->display_name ? interface_opts->display_name : "(unspecified)");
ws_log(log_domain, log_level, "Capture filter[%02d] : %s", i, interface_opts->cfilter ? interface_opts->cfilter : "(unspecified)");
ws_log(log_domain, log_level, "Snap length[%02d] (%u) : %d", i, interface_opts->has_snaplen, interface_opts->snaplen);
ws_log(log_domain, log_level, "Link Type[%02d] : %d", i, interface_opts->linktype);
ws_log(log_domain, log_level, "Promiscuous Mode[%02d]: %s", i, interface_opts->promisc_mode?"TRUE":"FALSE");
ws_log(log_domain, log_level, "Extcap[%02d] : %s", i, interface_opts->extcap ? interface_opts->extcap : "(unspecified)");
ws_log(log_domain, log_level, "Extcap FIFO[%02d] : %s", i, interface_opts->extcap_fifo ? interface_opts->extcap_fifo : "(unspecified)");
ws_log(log_domain, log_level, "Extcap PID[%02d] : %"PRIdMAX, i, (intmax_t)interface_opts->extcap_pid);
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
ws_log(log_domain, log_level, "Buffer size[%02d] : %d (MB)", i, interface_opts->buffer_size);
#endif
ws_log(log_domain, log_level, "Monitor Mode[%02d] : %s", i, interface_opts->monitor_mode?"TRUE":"FALSE");
#ifdef HAVE_PCAP_REMOTE
ws_log(log_domain, log_level, "Capture source[%02d] : %s", i,
interface_opts->src_type == CAPTURE_IFLOCAL ? "Local interface" :
interface_opts->src_type == CAPTURE_IFREMOTE ? "Remote interface" :
"Unknown");
if (interface_opts->src_type == CAPTURE_IFREMOTE) {
ws_log(log_domain, log_level, "Remote host[%02d] : %s", i, interface_opts->remote_host ? interface_opts->remote_host : "(unspecified)");
ws_log(log_domain, log_level, "Remote port[%02d] : %s", i, interface_opts->remote_port ? interface_opts->remote_port : "(unspecified)");
}
ws_log(log_domain, log_level, "Authentication[%02d] : %s", i,
interface_opts->auth_type == CAPTURE_AUTH_NULL ? "Null" :
interface_opts->auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
"Unknown");
if (interface_opts->auth_type == CAPTURE_AUTH_PWD) {
ws_log(log_domain, log_level, "Auth username[%02d] : %s", i, interface_opts->auth_username ? interface_opts->auth_username : "(unspecified)");
ws_log(log_domain, log_level, "Auth password[%02d] : <hidden>", i);
}
ws_log(log_domain, log_level, "UDP data tfer[%02d] : %u", i, interface_opts->datatx_udp);
ws_log(log_domain, log_level, "No cap. RPCAP[%02d] : %u", i, interface_opts->nocap_rpcap);
ws_log(log_domain, log_level, "No cap. local[%02d] : %u", i, interface_opts->nocap_local);
#endif
#ifdef HAVE_PCAP_SETSAMPLING
ws_log(log_domain, log_level, "Sampling meth.[%02d] : %d", i, interface_opts->sampling_method);
ws_log(log_domain, log_level, "Sampling param.[%02d] : %d", i, interface_opts->sampling_param);
#endif
ws_log(log_domain, log_level, "Timestamp type [%02d] : %s", i, interface_opts->timestamp_type);
}
ws_log(log_domain, log_level, "Interface name[df] : %s", capture_opts->default_options.name ? capture_opts->default_options.name : "(unspecified)");
ws_log(log_domain, log_level, "Interface Descr[df] : %s", capture_opts->default_options.descr ? capture_opts->default_options.descr : "(unspecified)");
ws_log(log_domain, log_level, "Interface Hardware Descr[df] : %s", capture_opts->default_options.hardware ? capture_opts->default_options.hardware : "(unspecified)");
ws_log(log_domain, log_level, "Interface display name[df] : %s", capture_opts->default_options.display_name ? capture_opts->default_options.display_name : "(unspecified)");
ws_log(log_domain, log_level, "Capture filter[df] : %s", capture_opts->default_options.cfilter ? capture_opts->default_options.cfilter : "(unspecified)");
ws_log(log_domain, log_level, "Snap length[df] (%u) : %d", capture_opts->default_options.has_snaplen, capture_opts->default_options.snaplen);
ws_log(log_domain, log_level, "Link Type[df] : %d", capture_opts->default_options.linktype);
ws_log(log_domain, log_level, "Promiscuous Mode[df]: %s", capture_opts->default_options.promisc_mode?"TRUE":"FALSE");
ws_log(log_domain, log_level, "Extcap[df] : %s", capture_opts->default_options.extcap ? capture_opts->default_options.extcap : "(unspecified)");
ws_log(log_domain, log_level, "Extcap FIFO[df] : %s", capture_opts->default_options.extcap_fifo ? capture_opts->default_options.extcap_fifo : "(unspecified)");
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
ws_log(log_domain, log_level, "Buffer size[df] : %d (MB)", capture_opts->default_options.buffer_size);
#endif
ws_log(log_domain, log_level, "Monitor Mode[df] : %s", capture_opts->default_options.monitor_mode?"TRUE":"FALSE");
#ifdef HAVE_PCAP_REMOTE
ws_log(log_domain, log_level, "Capture source[df] : %s",
capture_opts->default_options.src_type == CAPTURE_IFLOCAL ? "Local interface" :
capture_opts->default_options.src_type == CAPTURE_IFREMOTE ? "Remote interface" :
"Unknown");
if (capture_opts->default_options.src_type == CAPTURE_IFREMOTE) {
ws_log(log_domain, log_level, "Remote host[df] : %s", capture_opts->default_options.remote_host ? capture_opts->default_options.remote_host : "(unspecified)");
ws_log(log_domain, log_level, "Remote port[df] : %s", capture_opts->default_options.remote_port ? capture_opts->default_options.remote_port : "(unspecified)");
}
ws_log(log_domain, log_level, "Authentication[df] : %s",
capture_opts->default_options.auth_type == CAPTURE_AUTH_NULL ? "Null" :
capture_opts->default_options.auth_type == CAPTURE_AUTH_PWD ? "By username/password" :
"Unknown");
if (capture_opts->default_options.auth_type == CAPTURE_AUTH_PWD) {
ws_log(log_domain, log_level, "Auth username[df] : %s", capture_opts->default_options.auth_username ? capture_opts->default_options.auth_username : "(unspecified)");
ws_log(log_domain, log_level, "Auth password[df] : <hidden>");
}
ws_log(log_domain, log_level, "UDP data tfer[df] : %u", capture_opts->default_options.datatx_udp);
ws_log(log_domain, log_level, "No cap. RPCAP[df] : %u", capture_opts->default_options.nocap_rpcap);
ws_log(log_domain, log_level, "No cap. local[df] : %u", capture_opts->default_options.nocap_local);
#endif
#ifdef HAVE_PCAP_SETSAMPLING
ws_log(log_domain, log_level, "Sampling meth. [df] : %d", capture_opts->default_options.sampling_method);
ws_log(log_domain, log_level, "Sampling param.[df] : %d", capture_opts->default_options.sampling_param);
#endif
ws_log(log_domain, log_level, "Timestamp type [df] : %s", capture_opts->default_options.timestamp_type ? capture_opts->default_options.timestamp_type : "(unspecified)");
ws_log(log_domain, log_level, "SavingToFile : %u", capture_opts->saving_to_file);
ws_log(log_domain, log_level, "SaveFile : %s", (capture_opts->save_file) ? capture_opts->save_file : "");
ws_log(log_domain, log_level, "GroupReadAccess : %u", capture_opts->group_read_access);
ws_log(log_domain, log_level, "Fileformat : %s", (capture_opts->use_pcapng) ? "PCAPNG" : "PCAP");
ws_log(log_domain, log_level, "UpdateInterval : %u (ms)", capture_opts->update_interval);
ws_log(log_domain, log_level, "RealTimeMode : %u", capture_opts->real_time_mode);
ws_log(log_domain, log_level, "ShowInfo : %u", capture_opts->show_info);
ws_log(log_domain, log_level, "MultiFilesOn : %u", capture_opts->multi_files_on);
ws_log(log_domain, log_level, "FileDuration (%u) : %.3f", capture_opts->has_file_duration, capture_opts->file_duration);
ws_log(log_domain, log_level, "FileInterval (%u) : %u", capture_opts->has_file_interval, capture_opts->file_interval);
ws_log(log_domain, log_level, "FilePackets (%u) : %u", capture_opts->has_file_packets, capture_opts->file_packets);
ws_log(log_domain, log_level, "FileNameType : %s", (capture_opts->has_nametimenum) ? "prefix_time_num.suffix" : "prefix_num_time.suffix");
ws_log(log_domain, log_level, "RingNumFiles (%u) : %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files);
ws_log(log_domain, log_level, "RingPrintFiles (%u) : %s", capture_opts->print_file_names, (capture_opts->print_file_names ? capture_opts->print_name_to : ""));
ws_log(log_domain, log_level, "AutostopFiles (%u) : %u", capture_opts->has_autostop_files, capture_opts->autostop_files);
ws_log(log_domain, log_level, "AutostopPackets (%u) : %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets);
ws_log(log_domain, log_level, "AutostopWrittenPackets (%u) : %u", capture_opts->has_autostop_written_packets, capture_opts->autostop_written_packets);
ws_log(log_domain, log_level, "AutostopFilesize(%u) : %u (KB)", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize);
ws_log(log_domain, log_level, "AutostopDuration(%u) : %.3f", capture_opts->has_autostop_duration, capture_opts->autostop_duration);
ws_log(log_domain, log_level, "Temporary Directory : %s", capture_opts->temp_dir && capture_opts->temp_dir[0] ? capture_opts->temp_dir : g_get_tmp_dir());
}
/*
* 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 (g_ascii_isspace(*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_double(p,"autostop duration");
} else if (strcmp(autostoparg,"filesize") == 0) {
capture_opts->has_autostop_filesize = TRUE;
capture_opts->autostop_filesize = get_nonzero_guint32(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 if (strcmp(autostoparg,"packets") == 0) {
capture_opts->has_autostop_written_packets = TRUE;
capture_opts->autostop_written_packets = get_positive_int(p,"packet write count");
} else {
return FALSE;
}
*colonp = ':'; /* put the colon back */
return TRUE;
}
static gboolean get_filter_arguments(capture_options* capture_opts, const char* arg)
{
char* colonp;
char* val;
char* filter_exp = NULL;
colonp = strchr(arg, ':');
if (colonp) {
val = colonp;
*val = '\0';
val++;
if (strcmp(arg, "predef") == 0) {
GList* filterItem;
filterItem = capture_opts->capture_filters_list->list;
while (filterItem != NULL) {
filter_def *filterDef;
filterDef = (filter_def*)filterItem->data;
if (g_ascii_strcasecmp(val, filterDef->name) == 0) {
filter_exp = g_strdup(filterDef->strval);
break;
}
filterItem = filterItem->next;
}
}
}
if (filter_exp == NULL) {
/* No filter expression found yet; fallback to previous implementation
and assume the arg contains a filter expression */
if (colonp) {
*colonp = ':'; /* restore colon */
}
filter_exp = g_strdup(arg);
}
if (capture_opts->ifaces->len > 0) {
interface_options *interface_opts;
interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
g_free(interface_opts->cfilter);
interface_opts->cfilter = filter_exp;
return TRUE;
}
else {
g_free(capture_opts->default_options.cfilter);
capture_opts->default_options.cfilter = filter_exp;
return TRUE;
}
}
void
capture_opts_list_file_types(void) {
cmdarg_err("The available capture file types for the \"-F\" flag are:\n");
cmdarg_err_cont("%s", " pcap - Wireshark/tcpdump/... - pcap");
cmdarg_err_cont("%s", " pcapng - Wireshark/... - pcapng");
}
static gboolean get_file_type_argument(capture_options* capture_opts _U_, const
char* arg)
{
if (strcmp(arg, "pcapng") == 0) {
capture_opts->use_pcapng = TRUE;
} else if (strcmp(arg, "pcap") == 0) {
capture_opts->use_pcapng = FALSE;
} else {
return FALSE;
}
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 (g_ascii_isspace(*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_nonzero_guint32(p, "number of ring buffer files");
} else if (strcmp(arg,"filesize") == 0) {
capture_opts->has_autostop_filesize = TRUE;
capture_opts->autostop_filesize = get_nonzero_guint32(p, "ring buffer filesize");
} else if (strcmp(arg,"duration") == 0) {
capture_opts->has_file_duration = TRUE;
capture_opts->file_duration = get_positive_double(p, "ring buffer duration");
} else if (strcmp(arg,"interval") == 0) {
capture_opts->has_file_interval = TRUE;
capture_opts->file_interval = get_positive_int(p, "ring buffer interval");
} else if (strcmp(arg,"nametimenum") == 0) {
int val = get_positive_int(p, "file name: time before num");
capture_opts->has_nametimenum = (val > 1);
} else if (strcmp(arg,"packets") == 0) {
capture_opts->has_file_packets = TRUE;
capture_opts->file_packets = get_positive_int(p, "ring buffer packet count");
} else if (strcmp(arg,"printname") == 0) {
capture_opts->print_file_names = TRUE;
capture_opts->print_name_to = g_strdup(p);
}
else {
return FALSE;
}
*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 (g_ascii_isspace(*p))
p++;
if (*p == '\0') {
*colonp = ':';
return FALSE;
}
if (strcmp(arg, "count") == 0) {
if (capture_opts->ifaces->len > 0) {
interface_options *interface_opts;
interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
interface_opts->sampling_method = CAPTURE_SAMP_BY_COUNT;
interface_opts->sampling_param = get_positive_int(p, "sampling count");
} else {
capture_opts->default_options.sampling_method = CAPTURE_SAMP_BY_COUNT;
capture_opts->default_options.sampling_param = get_positive_int(p, "sampling count");
}
} else if (strcmp(arg, "timer") == 0) {
if (capture_opts->ifaces->len > 0) {
interface_options *interface_opts;
interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
interface_opts->sampling_method = CAPTURE_SAMP_BY_TIMER;
interface_opts->sampling_param = get_positive_int(p, "sampling timer");
} else {
capture_opts->default_options.sampling_method = CAPTURE_SAMP_BY_TIMER;
capture_opts->default_options.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 (g_ascii_isspace(*p))
p++;
if (capture_opts->ifaces->len > 0) {
interface_options *interface_opts;
interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
interface_opts->auth_type = CAPTURE_AUTH_PWD;
interface_opts->auth_username = g_strdup(arg);
interface_opts->auth_password = g_strdup(p);
} else {
capture_opts->default_options.auth_type = CAPTURE_AUTH_PWD;
capture_opts->default_options.auth_username = g_strdup(arg);
capture_opts->default_options.auth_password = g_strdup(p);
}
*colonp = ':';
return TRUE;
}
#endif
#ifdef _WIN32
static char *
capture_opts_generate_display_name(const char *friendly_name,
const char *name _U_)
{
/*
* Display the friendly name rather than the not-so-friendly
* GUID-based interface name.
*/
return g_strdup(friendly_name);
}
#else
static char *
capture_opts_generate_display_name(const char *friendly_name,
const char *name)
{
/*
* On UN*X, however, users are more used to interface names,
* and may find it helpful to see them.
*/
return ws_strdup_printf("%s: %s", friendly_name, name);
}
#endif
static void
fill_in_interface_opts_defaults(interface_options *interface_opts, const capture_options *capture_opts)
{
interface_opts->cfilter = g_strdup(capture_opts->default_options.cfilter);
interface_opts->snaplen = capture_opts->default_options.snaplen;
interface_opts->has_snaplen = capture_opts->default_options.has_snaplen;
interface_opts->linktype = capture_opts->default_options.linktype;
interface_opts->promisc_mode = capture_opts->default_options.promisc_mode;
interface_opts->extcap_fifo = g_strdup(capture_opts->default_options.extcap_fifo);
interface_opts->extcap_args = NULL;
interface_opts->extcap_pid = WS_INVALID_PID;
interface_opts->extcap_pipedata = NULL;
interface_opts->extcap_stderr = NULL;
interface_opts->extcap_stdout_watch = 0;
interface_opts->extcap_stderr_watch = 0;
#ifdef _WIN32
interface_opts->extcap_pipe_h = INVALID_HANDLE_VALUE;
interface_opts->extcap_control_in_h = INVALID_HANDLE_VALUE;
interface_opts->extcap_control_out_h = INVALID_HANDLE_VALUE;
#endif
interface_opts->extcap_control_in = g_strdup(capture_opts->default_options.extcap_control_in);
interface_opts->extcap_control_out = g_strdup(capture_opts->default_options.extcap_control_out);
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
interface_opts->buffer_size = capture_opts->default_options.buffer_size;
#endif
interface_opts->monitor_mode = capture_opts->default_options.monitor_mode;
#ifdef HAVE_PCAP_REMOTE
interface_opts->src_type = capture_opts->default_options.src_type;
interface_opts->remote_host = g_strdup(capture_opts->default_options.remote_host);
interface_opts->remote_port = g_strdup(capture_opts->default_options.remote_port);
interface_opts->auth_type = capture_opts->default_options.auth_type;
interface_opts->auth_username = g_strdup(capture_opts->default_options.auth_username);
interface_opts->auth_password = g_strdup(capture_opts->default_options.auth_password);
interface_opts->datatx_udp = capture_opts->default_options.datatx_udp;
interface_opts->nocap_rpcap = capture_opts->default_options.nocap_rpcap;
interface_opts->nocap_local = capture_opts->default_options.nocap_local;
#endif
#ifdef HAVE_PCAP_SETSAMPLING
interface_opts->sampling_method = capture_opts->default_options.sampling_method;
interface_opts->sampling_param = capture_opts->default_options.sampling_param;
#endif
interface_opts->timestamp_type = capture_opts->default_options.timestamp_type;
}
static void
fill_in_interface_opts_from_ifinfo(interface_options *interface_opts,
const if_info_t *if_info)
{
interface_opts->name = g_strdup(if_info->name);
interface_opts->hardware = g_strdup(if_info->vendor_description);
/* XXX: ui/capture_ui_utils.c get_interface_descriptive_name()
* does several things different in setting descr (and thus
* display name):
* 1. It checks for a user-supplied description via
* capture_dev_user_descr_find(if_info->name), including a
* long-standing -X option of "stdin_descr" that dates back to 1.0
* 2. If we don't have a friendly name, but do have a vendor
* description (set to hardware above), that is used as the
* description.
*
* Perhaps we don't want to introduce a dependency on the prefs
* and ex-opts here. We could do 2 here, though.
*
* Because we always set interface_opts->display_name here, it is
* never NULL when get_iface_list_string is called, so that never
* calls get_interface_descriptive_name(). (And thus, we never
* actually use the vendor description in the display name/descr
* as a fallback.)
*/
if (if_info->friendly_name != NULL) {
/*
* We have a friendly name; remember it as the
* description...
*/
interface_opts->descr = g_strdup(if_info->friendly_name);
/*
* ...and use it in the console display name.
*/
interface_opts->display_name = capture_opts_generate_display_name(if_info->friendly_name, if_info->name);
} else {
/* fallback to the interface name */
interface_opts->descr = NULL;
interface_opts->display_name = g_strdup(if_info->name);
}
interface_opts->ifname = NULL;
interface_opts->if_type = if_info->type;
interface_opts->extcap = g_strdup(if_info->extcap);
}
static if_info_t*
find_ifinfo_by_name(GList *if_list, const char *name)
{
GList *if_entry;
if_info_t *matched_if_info;
size_t prefix_length;
matched_if_info = NULL;
if (if_list != NULL) {
/*
* Try and do an exact match (case insensitive) on the
* interface name, the interface description, and the
* hardware description.
*/
for (if_entry = g_list_first(if_list); if_entry != NULL;
if_entry = g_list_next(if_entry))
{
if_info_t *if_info = (if_info_t *)if_entry->data;
/*
* Does the specified name match the interface name
* with a case-insensitive match?
*/
if (g_ascii_strcasecmp(if_info->name, name) == 0) {
/*
* Yes.
*/
matched_if_info = if_info;
break;
}
/*
* Does this interface have a friendly name and, if so,
* does the specified name match the friendly name with
* a case-insensitive match?
*/
if (if_info->friendly_name != NULL &&
g_ascii_strcasecmp(if_info->friendly_name, name) == 0) {
/*
* Yes.
*/
matched_if_info = if_info;
break;
}
#ifdef _WIN32
/*
* On Windows, we store interface names in preferences as:
* friendlyname (name)
* Do we have a case-insensitive match for that?
*/
if (if_info->friendly_name != NULL) {
GString* combined_name = g_string_new(if_info->friendly_name);
g_string_append_printf(combined_name, " (%s)", if_info->name);
if (g_ascii_strcasecmp(combined_name->str, name) == 0) {
/*
* Yes.
*/
matched_if_info = if_info;
}
g_string_free(combined_name, TRUE);
if (matched_if_info != NULL) {
break;
}
}
#endif
}
if (matched_if_info == NULL) {
/*
* We didn't find it; attempt a case-insensitive prefix match
* of the friendly name.
*/
prefix_length = strlen(name);
for (if_entry = g_list_first(if_list); if_entry != NULL;
if_entry = g_list_next(if_entry))
{
if_info_t *if_info = (if_info_t *)if_entry->data;
if (if_info->friendly_name != NULL &&
g_ascii_strncasecmp(if_info->friendly_name, name, prefix_length) == 0) {
/*
* We found an interface whose friendly name matches
* with a case-insensitive prefix match.
*/
matched_if_info = if_info;
break;
}
}
}
}
return matched_if_info;
}
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;
interface_options interface_opts;
/*
* 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 UN*X 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.
*
* XXX - "shouldn't have names that begin with digits" is not true
* on Linux; see
*
* https://github.com/the-tcpdump-group/tcpdump/issues/522
*
* tcpdump handles that by trying to open the device by name and,
* if that fails *and* the name is a syntactically valid number
* (optional sign, followed by decimal digits), reports an error
* if it's not a valid interface index, and otherwise uses it as
* an interface index.
*/
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_opts->get_iface_list(&err, &err_str);
if (if_list == NULL) {
if (err == 0)
cmdarg_err("There are no interfaces on which a capture can be done");
else {
cmdarg_err("%s", err_str);
g_free(err_str);
}
return 2;
}
if_info = (if_info_t *)g_list_nth_data(if_list, (int)(adapter_index - 1));
if (if_info == NULL) {
cmdarg_err("There is no interface with that adapter index");
free_interface_list(if_list);
return 1;
}
fill_in_interface_opts_from_ifinfo(&interface_opts, if_info);
free_interface_list(if_list);
} else if (capture_opts->capture_child) {
/*
* In Wireshark capture child mode, so the exact interface name
* is supplied, and we don't need to look it up.
*/
if_info = if_info_get(optarg_str_p);
fill_in_interface_opts_from_ifinfo(&interface_opts, if_info);
if_info_free(if_info);
} else if (g_strcmp0(optarg_str_p, "-") == 0) {
/*
* Standard input. Don't bother to retrieve the interface_list;
* assume that there isn't a device named "-". (Retrieving the
* interface list involves spawning a privileged dumpcap process.)
*/
interface_opts.name = g_strdup(optarg_str_p);
interface_opts.descr = g_strdup("Standard input");
interface_opts.hardware = NULL;
interface_opts.display_name = g_strdup(interface_opts.descr);
interface_opts.ifname = NULL;
interface_opts.if_type = IF_STDIN;
interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
#ifdef _WIN32
} else if (win32_is_pipe_name(optarg_str_p)) {
/*
* Special named pipe name on Windows.
* https://learn.microsoft.com/en-us/windows/win32/ipc/pipe-names
* Don't bother retrieving the interface list.
*/
interface_opts.name = g_strdup(optarg_str_p);
interface_opts.descr = NULL;
interface_opts.hardware = NULL;
interface_opts.display_name = g_strdup(optarg_str_p);
interface_opts.ifname = NULL;
interface_opts.if_type = IF_PIPE;
interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
#endif
} else {
/*
* Search for that name in the interface list and, if we found
* it, fill in fields in the interface_opts structure.
*
* XXX - if we can't get the interface list, we don't report
* an error, as, on Windows, that might be due to WinPcap or
* Npcap not being installed, but the specified "interface"
* might be the standard input ("-") or a pipe, and dumpcap
* should support capturing from the standard input or from
* a pipe even if there's no capture support from *pcap.
*
* Perhaps doing something similar to what was suggested
* for numerical interfaces should be done.
*
* XXX: If we ever save pipe settings permanently, it should be
* capture_interface_list that tries to check saved pipes (or
* extcaps), possibly before retrieving the list.
*/
if_list = capture_opts->get_iface_list(&err, &err_str);
if_info = find_ifinfo_by_name(if_list, optarg_str_p);
if (if_info != NULL) {
/*
* We found the interface in the list; fill in the
* interface_opts structure from its if_info.
*/
fill_in_interface_opts_from_ifinfo(&interface_opts, if_info);
} else {
/*
* We didn't find the interface in the list; just use
* the specified name, so that, for example, if an
* interface doesn't show up in the list for some
* reason, the user can try specifying it explicitly
* for testing purposes.
*/
interface_opts.name = g_strdup(optarg_str_p);
interface_opts.descr = NULL;
interface_opts.hardware = NULL;
interface_opts.display_name = g_strdup(optarg_str_p);
interface_opts.ifname = NULL;
interface_opts.if_type = capture_opts->default_options.if_type;
interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
}
free_interface_list(if_list);
}
fill_in_interface_opts_defaults(&interface_opts, capture_opts);
g_array_append_val(capture_opts->ifaces, interface_opts);
return 0;
}
int
capture_opts_add_opt(capture_options *capture_opts, int opt, const char *optarg_str_p)
{
int status, snaplen;
ws_statb64 fstat;
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;
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
case 'B': /* Buffer size */
if (capture_opts->ifaces->len > 0) {
interface_options *interface_opts;
interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1);
interface_opts->buffer_size = get_positive_int(optarg_str_p, "buffer size");
} else {
capture_opts->default_options.buffer_size = get_positive_int(optarg_str_p, "buffer size");
}
break;
#endif
case 'c': /* Capture n packets */
/* XXX Use set_autostop_criterion instead? */
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->capture_filters_list == NULL)
capture_opts->capture_filters_list = ws_filter_list_read(CFILTER_LIST);
get_filter_arguments(capture_opts, optarg_str_p);
break;
case 'F': /* capture file type */
if (get_file_type_argument(capture_opts, optarg_str_p) == FALSE) {