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wireshark/capture.c

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/* capture.c
* Routines for packet capture
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#ifdef HAVE_LIBPCAP
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/dfilter/dfilter.h>
#include "file.h"
#include "capture.h"
#include <capchild/capture_ifinfo.h>
#include <capchild/capture_sync.h>
#include "capture_info.h"
#include "capture_ui_utils.h"
#include "ui/util.h"
#include "capture-pcap-util.h"
#include <epan/prefs.h>
#ifdef _WIN32
#include "capture-wpcap.h"
#endif
#include "ui/simple_dialog.h"
#include "ui/ui_util.h"
#include "wsutil/file_util.h"
#include "log.h"
typedef struct if_stat_cache_item_s {
char *name;
struct pcap_stat ps;
} if_stat_cache_item_t;
struct if_stat_cache_s {
int stat_fd;
int fork_child;
GList *cache_list; /* List of if_stat_chache_entry_t */
};
/* this callback mechanism should possibly be replaced by the g_signal_...() stuff (if I only would know how :-) */
typedef struct {
capture_callback_t cb_fct;
gpointer user_data;
} capture_callback_data_t;
static GList *capture_callbacks = NULL;
static void
capture_callback_invoke(int event, capture_session *cap_session)
{
capture_callback_data_t *cb;
GList *cb_item = capture_callbacks;
/* there should be at least one interested */
g_assert(cb_item != NULL);
while(cb_item != NULL) {
cb = (capture_callback_data_t *)cb_item->data;
cb->cb_fct(event, cap_session, cb->user_data);
cb_item = g_list_next(cb_item);
}
}
void
capture_callback_add(capture_callback_t func, gpointer user_data)
{
capture_callback_data_t *cb;
cb = (capture_callback_data_t *)g_malloc(sizeof(capture_callback_data_t));
cb->cb_fct = func;
cb->user_data = user_data;
capture_callbacks = g_list_append(capture_callbacks, cb);
}
void
capture_callback_remove(capture_callback_t func)
{
capture_callback_data_t *cb;
GList *cb_item = capture_callbacks;
while(cb_item != NULL) {
cb = (capture_callback_data_t *)cb_item->data;
if(cb->cb_fct == func) {
capture_callbacks = g_list_remove(capture_callbacks, cb);
g_free(cb);
return;
}
cb_item = g_list_next(cb_item);
}
g_assert_not_reached();
}
/**
* Start a capture.
*
* @return TRUE if the capture starts successfully, FALSE otherwise.
*/
gboolean
capture_start(capture_options *capture_opts, capture_session *cap_session, void(*update_cb)(void))
{
gboolean ret;
guint i;
GString *source = g_string_new("");
cap_session->state = CAPTURE_PREPARING;
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start ...");
#ifdef _WIN32
if (capture_opts->ifaces->len < 2) {
#else
if (capture_opts->ifaces->len < 4) {
#endif
for (i = 0; i < capture_opts->ifaces->len; i++) {
interface_options interface_opts;
interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
if (i > 0) {
if (capture_opts->ifaces->len > 2) {
g_string_append_printf(source, ",");
}
g_string_append_printf(source, " ");
if (i == capture_opts->ifaces->len - 1) {
g_string_append_printf(source, "and ");
}
}
g_string_append_printf(source, "%s", get_iface_description_for_interface(capture_opts, i));
if ((interface_opts.cfilter != NULL) &&
(strlen(interface_opts.cfilter) > 0)) {
g_string_append_printf(source, " (%s)", interface_opts.cfilter);
}
}
} else {
g_string_append_printf(source, "%u interfaces", capture_opts->ifaces->len);
}
cf_set_tempfile_source((capture_file *)cap_session->cf, source->str);
g_string_free(source, TRUE);
/* try to start the capture child process */
ret = sync_pipe_start(capture_opts, cap_session, update_cb);
if(!ret) {
if(capture_opts->save_file != NULL) {
g_free(capture_opts->save_file);
capture_opts->save_file = NULL;
}
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start failed!");
cap_session->state = CAPTURE_STOPPED;
} else {
/* the capture child might not respond shortly after bringing it up */
/* (for example: it will block if no input arrives from an input capture pipe (e.g. mkfifo)) */
/* to prevent problems, bring the main GUI into "capture mode" right after a successful */
/* spawn/exec of the capture child, without waiting for any response from it */
capture_callback_invoke(capture_cb_capture_prepared, cap_session);
if(capture_opts->show_info)
capture_info_open(cap_session);
}
return ret;
}
void
capture_stop(capture_session *cap_session)
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Stop ...");
capture_callback_invoke(capture_cb_capture_stopping, cap_session);
/* stop the capture child gracefully */
sync_pipe_stop(cap_session);
}
void
capture_restart(capture_session *cap_session)
{
capture_options *capture_opts = cap_session->capture_opts;
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Restart");
capture_opts->restart = TRUE;
capture_stop(cap_session);
}
void
capture_kill_child(capture_session *cap_session)
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "Capture Kill");
/* kill the capture child */
sync_pipe_kill(cap_session->fork_child);
}
/* We've succeeded in doing a (non real-time) capture; try to read it into a new capture file */
static gboolean
capture_input_read_all(capture_session *cap_session, gboolean is_tempfile,
gboolean drops_known, guint32 drops)
{
capture_options *capture_opts = cap_session->capture_opts;
int err;
/* Capture succeeded; attempt to open the capture file. */
if (cf_open((capture_file *)cap_session->cf, capture_opts->save_file, WTAP_TYPE_AUTO, is_tempfile, &err) != CF_OK) {
/* We're not doing a capture any more, so we don't have a save file. */
return FALSE;
}
/* Set the read filter to NULL. */
/* XXX - this is odd here; try to put it somewhere where it fits better */
cf_set_rfcode((capture_file *)cap_session->cf, NULL);
/* Get the packet-drop statistics.
XXX - there are currently no packet-drop statistics stored
in libpcap captures, and that's what we're reading.
At some point, we will add support in Wiretap to return
packet-drop statistics for capture file formats that store it,
and will make "cf_read()" get those statistics from Wiretap.
We clear the statistics (marking them as "not known") in
"cf_open()", and "cf_read()" will only fetch them and mark
them as known if Wiretap supplies them, so if we get the
statistics now, after calling "cf_open()" but before calling
"cf_read()", the values we store will be used by "cf_read()".
If a future libpcap capture file format stores the statistics,
we'll put them into the capture file that we write, and will
thus not have to set them here - "cf_read()" will get them from
the file and use them. */
if (drops_known) {
cf_set_drops_known((capture_file *)cap_session->cf, TRUE);
/* XXX - on some systems, libpcap doesn't bother filling in
"ps_ifdrop" - it doesn't even set it to zero - so we don't
bother looking at it.
Ideally, libpcap would have an interface that gave us
several statistics - perhaps including various interface
error statistics - and would tell us which of them it
supplies, allowing us to display only the ones it does. */
cf_set_drops((capture_file *)cap_session->cf, drops);
}
/* read in the packet data */
switch (cf_read((capture_file *)cap_session->cf, FALSE)) {
case CF_READ_OK:
case CF_READ_ERROR:
/* Just because we got an error, that doesn't mean we were unable
to read any of the file; we handle what we could get from the
file. */
break;
case CF_READ_ABORTED:
/* User wants to quit program. Exit by leaving the main loop,
so that any quit functions we registered get called. */
main_window_nested_quit();
return FALSE;
}
/* if we didn't capture even a single packet, close the file again */
if(cf_get_packet_count((capture_file *)cap_session->cf) == 0 && !capture_opts->restart) {
simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
"%sNo packets captured!%s\n"
"\n"
"As no data was captured, closing the %scapture file!\n"
"\n"
"\n"
"Help about capturing can be found at:\n"
"\n"
" http://wiki.wireshark.org/CaptureSetup"
#ifdef _WIN32
"\n\n"
"Wireless (Wi-Fi/WLAN):\n"
"Try to switch off promiscuous mode in the Capture Options!"
#endif
"",
simple_dialog_primary_start(), simple_dialog_primary_end(),
(cf_is_tempfile((capture_file *)cap_session->cf)) ? "temporary " : "");
cf_close((capture_file *)cap_session->cf);
}
return TRUE;
}
/* capture child tells us we have a new (or the first) capture file */
gboolean
capture_input_new_file(capture_session *cap_session, gchar *new_file)
{
capture_options *capture_opts = cap_session->capture_opts;
gboolean is_tempfile;
int err;
if(cap_session->state == CAPTURE_PREPARING) {
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture started!");
}
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "File: \"%s\"", new_file);
g_assert(cap_session->state == CAPTURE_PREPARING || cap_session->state == CAPTURE_RUNNING);
/* free the old filename */
if(capture_opts->save_file != NULL) {
/* we start a new capture file, close the old one (if we had one before). */
/* (we can only have an open capture file in real_time_mode!) */
if( ((capture_file *) cap_session->cf)->state != FILE_CLOSED) {
if(capture_opts->real_time_mode) {
capture_callback_invoke(capture_cb_capture_update_finished, cap_session);
cf_finish_tail((capture_file *)cap_session->cf, &err);
cf_close((capture_file *)cap_session->cf);
} else {
capture_callback_invoke(capture_cb_capture_fixed_finished, cap_session);
}
}
g_free(capture_opts->save_file);
is_tempfile = FALSE;
cf_set_tempfile((capture_file *)cap_session->cf, FALSE);
} else {
/* we didn't have a save_file before; must be a tempfile */
is_tempfile = TRUE;
cf_set_tempfile((capture_file *)cap_session->cf, TRUE);
}
/* save the new filename */
capture_opts->save_file = g_strdup(new_file);
/* if we are in real-time mode, open the new file now */
if(capture_opts->real_time_mode) {
/* Attempt to open the capture file and set up to read from it. */
switch(cf_open((capture_file *)cap_session->cf, capture_opts->save_file, WTAP_TYPE_AUTO, is_tempfile, &err)) {
case CF_OK:
break;
case CF_ERROR:
/* Don't unlink (delete) the save file - leave it around,
for debugging purposes. */
g_free(capture_opts->save_file);
capture_opts->save_file = NULL;
return FALSE;
}
} else {
capture_callback_invoke(capture_cb_capture_prepared, cap_session);
}
if(capture_opts->show_info) {
if (!capture_info_new_file(new_file))
return FALSE;
}
if(capture_opts->real_time_mode) {
capture_callback_invoke(capture_cb_capture_update_started, cap_session);
} else {
capture_callback_invoke(capture_cb_capture_fixed_started, cap_session);
}
cap_session->state = CAPTURE_RUNNING;
return TRUE;
}
/* capture child tells us we have new packets to read */
void
capture_input_new_packets(capture_session *cap_session, int to_read)
{
capture_options *capture_opts = cap_session->capture_opts;
int err;
g_assert(capture_opts->save_file);
if(capture_opts->real_time_mode) {
/* Read from the capture file the number of records the child told us it added. */
switch (cf_continue_tail((capture_file *)cap_session->cf, to_read, &err)) {
case CF_READ_OK:
case CF_READ_ERROR:
/* Just because we got an error, that doesn't mean we were unable
to read any of the file; we handle what we could get from the
file.
XXX - abort on a read error? */
capture_callback_invoke(capture_cb_capture_update_continue, cap_session);
break;
case CF_READ_ABORTED:
/* Kill the child capture process; the user wants to exit, and we
shouldn't just leave it running. */
capture_kill_child(cap_session);
break;
}
} else {
/* increase the capture file packet counter by the number of incoming packets */
cf_set_packet_count((capture_file *)cap_session->cf,
cf_get_packet_count((capture_file *)cap_session->cf) + to_read);
cf_fake_continue_tail((capture_file *)cap_session->cf);
capture_callback_invoke(capture_cb_capture_fixed_continue, cap_session);
}
/* update the main window so we get events (e.g. from the stop toolbar button) */
/* This causes a hang on Windows (see bug 7305). Do we need this on any platform? */
#ifndef _WIN32
main_window_update();
#endif
if(capture_opts->show_info)
capture_info_new_packets(to_read);
}
/* Capture child told us how many dropped packets it counted.
*/
void
capture_input_drops(capture_session *cap_session, guint32 dropped)
{
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "%u packet%s dropped", dropped, plurality(dropped, "", "s"));
g_assert(cap_session->state == CAPTURE_RUNNING);
cf_set_drops_known((capture_file *)cap_session->cf, TRUE);
cf_set_drops((capture_file *)cap_session->cf, dropped);
}
/* Capture child told us that an error has occurred while starting/running
the capture.
The buffer we're handed has *two* null-terminated strings in it - a
primary message and a secondary message, one right after the other.
The secondary message might be a null string.
*/
void
capture_input_error_message(capture_session *cap_session, char *error_msg,
char *secondary_error_msg)
{
gchar *safe_error_msg;
gchar *safe_secondary_error_msg;
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Error message from child: \"%s\", \"%s\"",
error_msg, secondary_error_msg);
g_assert(cap_session->state == CAPTURE_PREPARING || cap_session->state == CAPTURE_RUNNING);
safe_error_msg = simple_dialog_format_message(error_msg);
if (*secondary_error_msg != '\0') {
/* We have both primary and secondary messages. */
safe_secondary_error_msg = simple_dialog_format_message(secondary_error_msg);
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s%s%s\n\n%s",
simple_dialog_primary_start(), safe_error_msg,
simple_dialog_primary_end(), safe_secondary_error_msg);
g_free(safe_secondary_error_msg);
} else {
/* We have only a primary message. */
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s%s%s",
simple_dialog_primary_start(), safe_error_msg,
simple_dialog_primary_end());
}
g_free(safe_error_msg);
/* the capture child will close the sync_pipe if required, nothing to do for now */
}
/* Capture child told us that an error has occurred while parsing a
capture filter when starting/running the capture.
*/
void
capture_input_cfilter_error_message(capture_session *cap_session, guint i,
char *error_message)
{
capture_options *capture_opts = cap_session->capture_opts;
dfilter_t *rfcode = NULL;
gchar *safe_cfilter;
gchar *safe_descr;
gchar *safe_cfilter_error_msg;
interface_options interface_opts;
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture filter error message from child: \"%s\"", error_message);
g_assert(cap_session->state == CAPTURE_PREPARING || cap_session->state == CAPTURE_RUNNING);
g_assert(i < capture_opts->ifaces->len);
interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
safe_cfilter = simple_dialog_format_message(interface_opts.cfilter);
safe_descr = simple_dialog_format_message(interface_opts.descr);
safe_cfilter_error_msg = simple_dialog_format_message(error_message);
/* Did the user try a display filter? */
if (dfilter_compile(interface_opts.cfilter, &rfcode) && rfcode != NULL) {
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"%sInvalid capture filter \"%s\" for interface %s!%s\n"
"\n"
"That string looks like a valid display filter; however, it isn't a valid\n"
"capture filter (%s).\n"
"\n"
"Note that display filters and capture filters don't have the same syntax,\n"
"so you can't use most display filter expressions as capture filters.\n"
"\n"
"See the User's Guide for a description of the capture filter syntax.",
simple_dialog_primary_start(), safe_cfilter, safe_descr,
simple_dialog_primary_end(), safe_cfilter_error_msg);
dfilter_free(rfcode);
} else {
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"%sInvalid capture filter \"%s\" for interface %s!%s\n"
"\n"
"That string isn't a valid capture filter (%s).\n"
"See the User's Guide for a description of the capture filter syntax.",
simple_dialog_primary_start(), safe_cfilter, safe_descr,
simple_dialog_primary_end(), safe_cfilter_error_msg);
}
g_free(safe_cfilter_error_msg);
g_free(safe_descr);
g_free(safe_cfilter);
/* the capture child will close the sync_pipe if required, nothing to do for now */
}
/* capture child closed its side of the pipe, do the required cleanup */
void
capture_input_closed(capture_session *cap_session, gchar *msg)
{
capture_options *capture_opts = cap_session->capture_opts;
int err;
int packet_count_save;
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture stopped!");
g_assert(cap_session->state == CAPTURE_PREPARING || cap_session->state == CAPTURE_RUNNING);
if (msg != NULL)
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s", msg);
if(cap_session->state == CAPTURE_PREPARING) {
/* We didn't start a capture; note that the attempt to start it
failed. */
capture_callback_invoke(capture_cb_capture_failed, cap_session);
} else {
/* We started a capture; process what's left of the capture file if
we were in "update list of packets in real time" mode, or process
all of it if we weren't. */
if(capture_opts->real_time_mode) {
cf_read_status_t status;
/* Read what remains of the capture file. */
status = cf_finish_tail((capture_file *)cap_session->cf, &err);
/* XXX: If -Q (quit-after-cap) then cf->count clr'd below so save it first */
packet_count_save = cf_get_packet_count((capture_file *)cap_session->cf);
/* Tell the GUI we are not doing a capture any more.
Must be done after the cf_finish_tail(), so file lengths are
correctly displayed */
capture_callback_invoke(capture_cb_capture_update_finished, cap_session);
/* Finish the capture. */
switch (status) {
case CF_READ_OK:
if ((packet_count_save == 0) && !capture_opts->restart) {
simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
"%sNo packets captured!%s\n"
"\n"
"As no data was captured, closing the %scapture file!\n"
"\n"
"\n"
"Help about capturing can be found at:\n"
"\n"
" http://wiki.wireshark.org/CaptureSetup"
#ifdef _WIN32
"\n\n"
"Wireless (Wi-Fi/WLAN):\n"
"Try to switch off promiscuous mode in the Capture Options!"
#endif
"",
simple_dialog_primary_start(), simple_dialog_primary_end(),
cf_is_tempfile((capture_file *)cap_session->cf) ? "temporary " : "");
cf_close((capture_file *)cap_session->cf);
}
break;
case CF_READ_ERROR:
/* Just because we got an error, that doesn't mean we were unable
to read any of the file; we handle what we could get from the
file. */
break;
case CF_READ_ABORTED:
/* Exit by leaving the main loop, so that any quit functions
we registered get called. */
main_window_quit();
break;
}
} else {
/* first of all, we are not doing a capture any more */
capture_callback_invoke(capture_cb_capture_fixed_finished, cap_session);
/* this is a normal mode capture and if no error happened, read in the capture file data */
if(capture_opts->save_file != NULL) {
capture_input_read_all(cap_session, cf_is_tempfile((capture_file *)cap_session->cf),
cf_get_drops_known((capture_file *)cap_session->cf), cf_get_drops((capture_file *)cap_session->cf));
}
}
}
if(capture_opts->show_info)
capture_info_close();
cap_session->state = CAPTURE_STOPPED;
/* if we couldn't open a capture file, there's nothing more for us to do */
if(capture_opts->save_file == NULL) {
cf_close((capture_file *)cap_session->cf);
return;
}
/* does the user wants to restart the current capture? */
if(capture_opts->restart) {
capture_opts->restart = FALSE;
ws_unlink(capture_opts->save_file);
/* If we have a ring buffer, the original save file has been overwritten
with the "ring filename". Restore it before starting again */
if ((capture_opts->multi_files_on) && (capture_opts->orig_save_file != NULL)) {
g_free(capture_opts->save_file);
capture_opts->save_file = g_strdup(capture_opts->orig_save_file);
}
/* if it was a tempfile, throw away the old filename (so it will become a tempfile again) */
if(cf_is_tempfile((capture_file *)cap_session->cf)) {
g_free(capture_opts->save_file);
capture_opts->save_file = NULL;
}
/* ... and start the capture again */
if (capture_opts->ifaces->len == 0) {
collect_ifaces(capture_opts);
}
/* close the currently loaded capture file */
cf_close((capture_file *)cap_session->cf);
capture_start(capture_opts, cap_session,NULL); /*XXX is this NULL ok or we need an update_cb???*/
} else {
/* We're not doing a capture any more, so we don't have a save file. */
g_free(capture_opts->save_file);
capture_opts->save_file = NULL;
}
}
if_stat_cache_t *
capture_stat_start(capture_options *capture_opts) {
int stat_fd, fork_child;
gchar *msg;
if_stat_cache_t *sc = NULL;
if_stat_cache_item_t *sc_item;
guint i;
interface_t device;
/* Fire up dumpcap. */
/*
* XXX - on systems with BPF, the number of BPF devices limits the
* number of devices on which you can capture simultaneously.
*
* This means that
*
* 1) this might fail if you run out of BPF devices
*
* and
*
* 2) opening every interface could leave too few BPF devices
* for *other* programs.
*
* It also means the system could end up getting a lot of traffic
* that it has to pass through the networking stack and capture
* mechanism, so opening all the devices and presenting packet
* counts might not always be a good idea.
*/
if (sync_interface_stats_open(&stat_fd, &fork_child, &msg, NULL) == 0) {
sc = (if_stat_cache_t *)g_malloc(sizeof(if_stat_cache_t));
sc->stat_fd = stat_fd;
sc->fork_child = fork_child;
sc->cache_list = NULL;
/* Initialize the cache */
for (i = 0; i < capture_opts->all_ifaces->len; i++) {
device = g_array_index(capture_opts->all_ifaces, interface_t, i);
if (device.type != IF_PIPE) {
sc_item = (if_stat_cache_item_t *)g_malloc0(sizeof(if_stat_cache_item_t));
sc_item->name = g_strdup(device.if_info.name);
sc->cache_list = g_list_append(sc->cache_list, sc_item);
}
}
}
return sc;
}
#define MAX_STAT_LINE_LEN 500
static void
capture_stat_cache_update(if_stat_cache_t *sc) {
gchar stat_line[MAX_STAT_LINE_LEN] = "";
gchar **stat_parts;
GList *sc_entry;
if_stat_cache_item_t *sc_item;
if (!sc)
return;
while (sync_pipe_gets_nonblock(sc->stat_fd, stat_line, MAX_STAT_LINE_LEN) > 0) {
g_strstrip(stat_line);
stat_parts = g_strsplit(stat_line, "\t", 3);
if (stat_parts[0] == NULL || stat_parts[1] == NULL ||
stat_parts[2] == NULL) {
g_strfreev(stat_parts);
continue;
}
for (sc_entry = sc->cache_list; sc_entry != NULL; sc_entry = g_list_next(sc_entry)) {
sc_item = (if_stat_cache_item_t *)sc_entry->data;
if (strcmp(sc_item->name, stat_parts[0]) == 0) {
sc_item->ps.ps_recv = (u_int) strtoul(stat_parts[1], NULL, 10);
sc_item->ps.ps_drop = (u_int) strtoul(stat_parts[2], NULL, 10);
}
}
g_strfreev(stat_parts);
}
}
gboolean
capture_stats(if_stat_cache_t *sc, char *ifname, struct pcap_stat *ps) {
GList *sc_entry;
if_stat_cache_item_t *sc_item;
if (!sc || !ifname || !ps) {
return FALSE;
}
capture_stat_cache_update(sc);
for (sc_entry = sc->cache_list; sc_entry != NULL; sc_entry = g_list_next(sc_entry)) {
sc_item = (if_stat_cache_item_t *)sc_entry->data;
if (strcmp(sc_item->name, ifname) == 0) {
memcpy(ps, &sc_item->ps, sizeof(struct pcap_stat));
return TRUE;
}
}
return FALSE;
}
void
capture_stat_stop(if_stat_cache_t *sc) {
GList *sc_entry;
if_stat_cache_item_t *sc_item;
int ret;
gchar *msg;
if (!sc)
return;
ret = sync_interface_stats_close(&sc->stat_fd, &sc->fork_child, &msg);
if (ret == -1) {
/* XXX - report failure? */
g_free(msg);
}
for (sc_entry = sc->cache_list; sc_entry != NULL; sc_entry = g_list_next(sc_entry)) {
sc_item = (if_stat_cache_item_t *)sc_entry->data;
g_free(sc_item->name);
g_free(sc_item);
}
g_free(sc);
}
#endif /* HAVE_LIBPCAP */
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