![Guy Harris](/assets/img/avatar_default.png)
That way we aren't allocating memory, reading packets from a batch, and freeing the memory for each batch of packets delivered by dumpcap; we do the allocation when the capture starts and the freeing when it finishes. Change-Id: If012ab865f3a99d869535ad10827ad8680c1b10c Reviewed-on: https://code.wireshark.org/review/32766 Petri-Dish: Guy Harris <guy@alum.mit.edu> Tested-by: Petri Dish Buildbot Reviewed-by: Anders Broman <a.broman58@gmail.com>
902 lines
32 KiB
C
902 lines
32 KiB
C
/* capture.c
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* Routines for packet capture
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#ifdef HAVE_LIBPCAP
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/dfilter/dfilter.h>
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#include "file.h"
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#include "ui/capture.h"
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#include "caputils/capture_ifinfo.h"
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#include <capchild/capture_sync.h>
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#include "capture_info.h"
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#include "ui/capture_ui_utils.h"
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#include "ui/util.h"
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#include "caputils/capture-pcap-util.h"
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#include <epan/prefs.h>
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#ifdef _WIN32
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#include "caputils/capture-wpcap.h"
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#endif
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#include "ui/simple_dialog.h"
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#include "ui/ws_ui_util.h"
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#include "wsutil/file_util.h"
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#include "wsutil/str_util.h"
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#include <wsutil/filesystem.h>
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#include "log.h"
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typedef struct if_stat_cache_item_s {
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char *name;
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struct pcap_stat ps;
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} if_stat_cache_item_t;
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struct if_stat_cache_s {
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int stat_fd;
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ws_process_id fork_child;
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GList *cache_list; /* List of if_stat_chache_entry_t */
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};
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/* this callback mechanism should possibly be replaced by the g_signal_...() stuff (if I only would know how :-) */
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typedef struct {
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capture_callback_t cb_fct;
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gpointer user_data;
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} capture_callback_data_t;
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static GList *capture_callbacks = NULL;
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static void
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capture_callback_invoke(int event, capture_session *cap_session)
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{
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capture_callback_data_t *cb;
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GList *cb_item = capture_callbacks;
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/* there should be at least one interested */
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g_assert(cb_item != NULL);
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while(cb_item != NULL) {
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cb = (capture_callback_data_t *)cb_item->data;
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cb->cb_fct(event, cap_session, cb->user_data);
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cb_item = g_list_next(cb_item);
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}
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}
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void
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capture_callback_add(capture_callback_t func, gpointer user_data)
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{
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capture_callback_data_t *cb;
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cb = (capture_callback_data_t *)g_malloc(sizeof(capture_callback_data_t));
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cb->cb_fct = func;
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cb->user_data = user_data;
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capture_callbacks = g_list_prepend(capture_callbacks, cb);
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}
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void
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capture_callback_remove(capture_callback_t func, gpointer user_data)
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{
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capture_callback_data_t *cb;
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GList *cb_item = capture_callbacks;
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while(cb_item != NULL) {
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cb = (capture_callback_data_t *)cb_item->data;
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if(cb->cb_fct == func && cb->user_data == user_data) {
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capture_callbacks = g_list_remove(capture_callbacks, cb);
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g_free(cb);
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return;
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}
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cb_item = g_list_next(cb_item);
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}
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g_assert_not_reached();
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}
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/**
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* Start a capture.
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*
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* @return TRUE if the capture starts successfully, FALSE otherwise.
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*/
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gboolean
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capture_start(capture_options *capture_opts, capture_session *cap_session, info_data_t* cap_data, void(*update_cb)(void))
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{
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GString *source;
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cap_session->state = CAPTURE_PREPARING;
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cap_session->count = 0;
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start ...");
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source = get_iface_list_string(capture_opts, IFLIST_SHOW_FILTER);
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cf_set_tempfile_source((capture_file *)cap_session->cf, source->str);
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g_string_free(source, TRUE);
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/* try to start the capture child process */
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if (!sync_pipe_start(capture_opts, cap_session, cap_data, update_cb)) {
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/* We failed to start the capture child. */
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if(capture_opts->save_file != NULL) {
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g_free(capture_opts->save_file);
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capture_opts->save_file = NULL;
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}
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start failed.");
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cap_session->state = CAPTURE_STOPPED;
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return FALSE;
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}
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/* the capture child might not respond shortly after bringing it up */
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/* (for example: it will block if no input arrives from an input capture pipe (e.g. mkfifo)) */
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/* to prevent problems, bring the main GUI into "capture mode" right after a successful */
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/* spawn/exec of the capture child, without waiting for any response from it */
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capture_callback_invoke(capture_cb_capture_prepared, cap_session);
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wtap_rec_init(&cap_session->rec);
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ws_buffer_init(&cap_session->buf, 1514);
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if (capture_opts->show_info) {
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cap_session->wtap = NULL;
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if (cap_data->counts.counts_hash != NULL)
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{
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/* Clean up any previous lists of packet counts */
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g_hash_table_destroy(cap_data->counts.counts_hash);
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}
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cap_data->counts.counts_hash = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, g_free);
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cap_data->counts.other = 0;
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cap_data->counts.total = 0;
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cap_data->ui.counts = &cap_data->counts;
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capture_info_ui_create(&cap_data->ui, cap_session);
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}
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return TRUE;
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}
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void
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capture_stop(capture_session *cap_session)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Stop ...");
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capture_callback_invoke(capture_cb_capture_stopping, cap_session);
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/* stop the capture child gracefully */
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sync_pipe_stop(cap_session);
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}
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void
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capture_kill_child(capture_session *cap_session)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "Capture Kill");
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/* kill the capture child */
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sync_pipe_kill(cap_session->fork_child);
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}
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/* We've succeeded in doing a (non real-time) capture; try to read it into a new capture file */
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static gboolean
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capture_input_read_all(capture_session *cap_session, gboolean is_tempfile,
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gboolean drops_known, guint32 drops)
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{
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capture_options *capture_opts = cap_session->capture_opts;
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int err;
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/* Capture succeeded; attempt to open the capture file. */
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if (cf_open((capture_file *)cap_session->cf, capture_opts->save_file, WTAP_TYPE_AUTO, is_tempfile, &err) != CF_OK) {
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/* We're not doing a capture any more, so we don't have a save file. */
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return FALSE;
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}
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/* Set the read filter to NULL. */
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/* XXX - this is odd here; try to put it somewhere where it fits better */
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cf_set_rfcode((capture_file *)cap_session->cf, NULL);
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/* Get the packet-drop statistics.
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XXX - there are currently no packet-drop statistics stored
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in libpcap captures, and that's what we're reading.
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At some point, we will add support in Wiretap to return
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packet-drop statistics for capture file formats that store it,
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and will make "cf_read()" get those statistics from Wiretap.
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We clear the statistics (marking them as "not known") in
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"cf_open()", and "cf_read()" will only fetch them and mark
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them as known if Wiretap supplies them, so if we get the
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statistics now, after calling "cf_open()" but before calling
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"cf_read()", the values we store will be used by "cf_read()".
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If a future libpcap capture file format stores the statistics,
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we'll put them into the capture file that we write, and will
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thus not have to set them here - "cf_read()" will get them from
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the file and use them. */
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if (drops_known) {
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cf_set_drops_known((capture_file *)cap_session->cf, TRUE);
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/* XXX - on some systems, libpcap doesn't bother filling in
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"ps_ifdrop" - it doesn't even set it to zero - so we don't
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bother looking at it.
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Ideally, libpcap would have an interface that gave us
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several statistics - perhaps including various interface
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error statistics - and would tell us which of them it
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supplies, allowing us to display only the ones it does. */
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cf_set_drops((capture_file *)cap_session->cf, drops);
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}
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/* read in the packet data */
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switch (cf_read((capture_file *)cap_session->cf, FALSE)) {
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case CF_READ_OK:
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case CF_READ_ERROR:
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/* Just because we got an error, that doesn't mean we were unable
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to read any of the file; we handle what we could get from the
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file. */
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break;
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case CF_READ_ABORTED:
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/* User wants to quit program. Exit by leaving the main loop,
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so that any quit functions we registered get called. */
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main_window_quit();
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return FALSE;
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}
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/* if we didn't capture even a single packet, close the file again */
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if(cap_session->count == 0 && !capture_opts->restart) {
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simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
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"%sNo packets captured.%s\n"
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"\n"
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"As no data was captured, closing the %scapture file.\n"
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"\n"
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"\n"
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"Help about capturing can be found at\n"
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"\n"
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" https://wiki.wireshark.org/CaptureSetup"
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#ifdef _WIN32
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"\n\n"
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"Wireless (Wi-Fi/WLAN):\n"
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"Try to switch off promiscuous mode in the Capture Options"
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#endif
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"",
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simple_dialog_primary_start(), simple_dialog_primary_end(),
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(cf_is_tempfile((capture_file *)cap_session->cf)) ? "temporary " : "");
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cf_close((capture_file *)cap_session->cf);
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}
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return TRUE;
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}
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static const char *
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cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
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int file_type)
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{
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const char *errmsg;
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static char errmsg_errno[1024 + 1];
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if (err < 0) {
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/* Wiretap error. */
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switch (err) {
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case WTAP_ERR_NOT_REGULAR_FILE:
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errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
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break;
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case WTAP_ERR_FILE_UNKNOWN_FORMAT:
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/* Seen only when opening a capture file for reading. */
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errmsg = "The file \"%s\" isn't a capture file in a format Wireshark understands.";
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break;
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case WTAP_ERR_UNSUPPORTED:
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/* Seen only when opening a capture file for reading. */
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g_snprintf(errmsg_errno, sizeof(errmsg_errno),
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"The file \"%%s\" contains record data that Wireshark doesn't support.\n"
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"(%s)", err_info != NULL ? err_info : "no information supplied");
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g_free(err_info);
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errmsg = errmsg_errno;
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break;
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case WTAP_ERR_CANT_WRITE_TO_PIPE:
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/* Seen only when opening a capture file for writing. */
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g_snprintf(errmsg_errno, sizeof(errmsg_errno),
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"The file \"%%s\" is a pipe, and %s capture files can't be "
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"written to a pipe.", wtap_file_type_subtype_string(file_type));
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errmsg = errmsg_errno;
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break;
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case WTAP_ERR_UNWRITABLE_FILE_TYPE:
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/* Seen only when opening a capture file for writing. */
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errmsg = "Wireshark doesn't support writing capture files in that format.";
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break;
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case WTAP_ERR_UNWRITABLE_ENCAP:
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/* Seen only when opening a capture file for writing. */
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errmsg = "Wireshark can't save this capture in that format.";
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break;
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case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
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if (for_writing)
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errmsg = "Wireshark can't save this capture in that format.";
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else
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errmsg = "The file \"%s\" is a capture for a network type that Wireshark doesn't support.";
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break;
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case WTAP_ERR_BAD_FILE:
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/* Seen only when opening a capture file for reading. */
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g_snprintf(errmsg_errno, sizeof(errmsg_errno),
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"The file \"%%s\" appears to be damaged or corrupt.\n"
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"(%s)", err_info != NULL ? err_info : "no information supplied");
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g_free(err_info);
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errmsg = errmsg_errno;
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break;
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case WTAP_ERR_CANT_OPEN:
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if (for_writing)
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errmsg = "The file \"%s\" could not be created for some unknown reason.";
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else
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errmsg = "The file \"%s\" could not be opened for some unknown reason.";
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break;
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case WTAP_ERR_SHORT_READ:
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errmsg = "The file \"%s\" appears to have been cut short"
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" in the middle of a packet or other data.";
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break;
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case WTAP_ERR_SHORT_WRITE:
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errmsg = "A full header couldn't be written to the file \"%s\".";
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break;
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case WTAP_ERR_DECOMPRESS:
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g_snprintf(errmsg_errno, sizeof(errmsg_errno),
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"The compressed file \"%%s\" appears to be damaged or corrupt.\n"
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"(%s)", err_info != NULL ? err_info : "no information supplied");
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g_free(err_info);
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errmsg = errmsg_errno;
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break;
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case WTAP_ERR_DECOMPRESSION_NOT_SUPPORTED:
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g_snprintf(errmsg_errno, sizeof(errmsg_errno),
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"We don't support the form of compression used by the compressed file \"%%s\".\n"
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"(%s)", err_info != NULL ? err_info : "no information supplied");
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g_free(err_info);
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errmsg = errmsg_errno;
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break;
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default:
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g_snprintf(errmsg_errno, sizeof(errmsg_errno),
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"The file \"%%s\" could not be %s: %s.",
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for_writing ? "created" : "opened",
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wtap_strerror(err));
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errmsg = errmsg_errno;
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break;
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}
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}
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else
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errmsg = file_open_error_message(err, for_writing);
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return errmsg;
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}
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/* capture child tells us we have a new (or the first) capture file */
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gboolean
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capture_input_new_file(capture_session *cap_session, gchar *new_file)
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{
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capture_options *capture_opts = cap_session->capture_opts;
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gboolean is_tempfile;
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int err;
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gchar *err_info;
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gchar *err_msg;
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if(cap_session->state == CAPTURE_PREPARING) {
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture started");
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}
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "File: \"%s\"", new_file);
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g_assert(cap_session->state == CAPTURE_PREPARING || cap_session->state == CAPTURE_RUNNING);
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/* free the old filename */
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if(capture_opts->save_file != NULL) {
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/* we start a new capture file, close the old one (if we had one before). */
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/* (we can only have an open capture file in real_time_mode!) */
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if( ((capture_file *) cap_session->cf)->state != FILE_CLOSED) {
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if(capture_opts->real_time_mode) {
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capture_callback_invoke(capture_cb_capture_update_finished, cap_session);
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cf_finish_tail((capture_file *)cap_session->cf,
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&cap_session->rec, &cap_session->buf, &err);
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cf_close((capture_file *)cap_session->cf);
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} else {
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capture_callback_invoke(capture_cb_capture_fixed_finished, cap_session);
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}
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}
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g_free(capture_opts->save_file);
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is_tempfile = FALSE;
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cf_set_tempfile((capture_file *)cap_session->cf, FALSE);
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} else {
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/* we didn't have a save_file before; must be a tempfile */
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is_tempfile = TRUE;
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cf_set_tempfile((capture_file *)cap_session->cf, TRUE);
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}
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/* save the new filename */
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capture_opts->save_file = g_strdup(new_file);
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/* if we are in real-time mode, open the new file now */
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if(capture_opts->real_time_mode) {
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/* Attempt to open the capture file and set up to read from it. */
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switch(cf_open((capture_file *)cap_session->cf, capture_opts->save_file, WTAP_TYPE_AUTO, is_tempfile, &err)) {
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case CF_OK:
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break;
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case CF_ERROR:
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/* Don't unlink (delete) the save file - leave it around,
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for debugging purposes. */
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g_free(capture_opts->save_file);
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capture_opts->save_file = NULL;
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return FALSE;
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}
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} else {
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capture_callback_invoke(capture_cb_capture_prepared, cap_session);
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}
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if(capture_opts->show_info) {
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if (cap_session->wtap != NULL) {
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wtap_close(cap_session->wtap);
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}
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cap_session->wtap = wtap_open_offline(new_file, WTAP_TYPE_AUTO, &err, &err_info, FALSE);
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if (!cap_session->wtap) {
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err_msg = g_strdup_printf(cf_open_error_message(err, err_info, FALSE, WTAP_FILE_TYPE_SUBTYPE_UNKNOWN),
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new_file);
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g_warning("capture_input_new_file: %d (%s)", err, err_msg);
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g_free(err_msg);
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return FALSE;
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}
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}
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if(capture_opts->real_time_mode) {
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capture_callback_invoke(capture_cb_capture_update_started, cap_session);
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} else {
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capture_callback_invoke(capture_cb_capture_fixed_started, cap_session);
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}
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cap_session->state = CAPTURE_RUNNING;
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return TRUE;
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}
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/* 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,
|
|
&cap_session->rec, &cap_session->buf, &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 {
|
|
cf_fake_continue_tail((capture_file *)cap_session->cf);
|
|
|
|
capture_callback_invoke(capture_cb_capture_fixed_continue, cap_session);
|
|
}
|
|
|
|
if(capture_opts->show_info)
|
|
capture_info_new_packets(to_read, cap_session->wtap, cap_session->cap_data_info);
|
|
}
|
|
|
|
|
|
/* Capture child told us how many dropped packets it counted.
|
|
*/
|
|
void
|
|
capture_input_drops(capture_session *cap_session, guint32 dropped, const char* interface_name)
|
|
{
|
|
if (interface_name != NULL) {
|
|
g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "%u packet%s dropped from %s", dropped, plurality(dropped, "", "s"), interface_name);
|
|
} else {
|
|
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,
|
|
const 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, NULL) && 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;
|
|
|
|
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);
|
|
|
|
wtap_rec_cleanup(&cap_session->rec);
|
|
ws_buffer_free(&cap_session->buf);
|
|
if(cap_session->state == CAPTURE_PREPARING) {
|
|
/* We started the capture child, but we didn't manage to start
|
|
the capture process; 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,
|
|
&cap_session->rec, &cap_session->buf, &err);
|
|
|
|
/* 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 (cap_session->count == 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"
|
|
" https://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_ui_destroy(&cap_session->cap_data_info->ui);
|
|
if(cap_session->wtap)
|
|
wtap_close(cap_session->wtap);
|
|
}
|
|
|
|
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;
|
|
|
|
/* 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;
|
|
}
|
|
} 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;
|
|
ws_process_id fork_child;
|
|
gchar *msg;
|
|
if_stat_cache_t *sc = g_new0(if_stat_cache_t, 1);
|
|
if_stat_cache_item_t *sc_item;
|
|
guint i;
|
|
interface_t *device;
|
|
|
|
sc->stat_fd = -1;
|
|
sc->fork_child = WS_INVALID_PID;
|
|
|
|
/* 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->stat_fd = stat_fd;
|
|
sc->fork_child = fork_child;
|
|
|
|
/* 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));
|
|
g_assert(device->if_info.name);
|
|
sc_item->name = g_strdup(device->if_info.name);
|
|
sc->cache_list = g_list_prepend(sc->cache_list, sc_item);
|
|
}
|
|
}
|
|
} else {
|
|
g_free(msg); /* XXX: should we display this to the user ? */
|
|
}
|
|
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 || sc->fork_child == WS_INVALID_PID) {
|
|
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 || sc->fork_child == WS_INVALID_PID || !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;
|
|
}
|
|
|
|
if (sc->fork_child != WS_INVALID_PID) {
|
|
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_list_free(sc->cache_list);
|
|
g_free(sc);
|
|
}
|
|
|
|
#endif /* HAVE_LIBPCAP */
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|