forked from osmocom/wireshark
434 lines
13 KiB
C
434 lines
13 KiB
C
/* follow_tcp.c
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* TCP specific routines for following traffic streams
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <ctype.h>
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#include <gtk/gtk.h>
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#include <epan/follow.h>
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#include <epan/dissectors/packet-ipv6.h>
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#include <epan/prefs.h>
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#include <epan/addr_resolv.h>
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#include <epan/charsets.h>
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#include <epan/epan_dissect.h>
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#include <epan/filesystem.h>
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#include <epan/ipproto.h>
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#include <epan/charsets.h>
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#include "../color.h"
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#include "../file.h"
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#include "../alert_box.h"
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#include "../simple_dialog.h"
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#include "../tempfile.h"
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#include <wsutil/file_util.h>
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#include "gtkglobals.h"
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#include "gtk/color_utils.h"
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#include "gtk/follow_tcp.h"
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#include "gtk/dlg_utils.h"
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#include "gtk/file_dlg.h"
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#include "gtk/keys.h"
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#include "gtk/main.h"
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#include "gtk/gui_utils.h"
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#include "win32/print_win32.h"
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#include "gtk/font_utils.h"
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#include "gtk/help_dlg.h"
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#include "gtk/follow_stream.h"
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#include "gtk/utf8_entities.h"
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/* With MSVC and a libwireshark.dll, we need a special declaration. */
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WS_VAR_IMPORT FILE *data_out_file;
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static void
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follow_redraw(gpointer data, gpointer user_data _U_)
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{
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follow_load_text((follow_info_t *)data);
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}
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/* Redraw the text in all "Follow TCP Stream" windows. */
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void
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follow_tcp_redraw_all(void)
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{
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g_list_foreach(follow_infos, follow_redraw, NULL);
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}
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/* Follow the TCP stream, if any, to which the last packet that we called
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a dissection routine on belongs (this might be the most recently
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selected packet, or it might be the last packet in the file). */
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void
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follow_tcp_stream_cb(GtkWidget * w _U_, gpointer data _U_)
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{
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GtkWidget *filter_cm;
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GtkWidget *filter_te;
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int tmp_fd;
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gchar *follow_filter;
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const gchar *previous_filter;
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int filter_out_filter_len;
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const char *hostname0, *hostname1;
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char *port0, *port1;
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gchar *server_to_client_string = NULL;
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gchar *client_to_server_string = NULL;
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gchar *both_directions_string = NULL;
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follow_stats_t stats;
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follow_info_t *follow_info;
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tcp_stream_chunk sc;
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size_t nchars;
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gchar *data_out_filename;
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/* we got tcp so we can follow */
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if (cfile.edt->pi.ipproto != IP_PROTO_TCP) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Error following stream. Please make\n"
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"sure you have a TCP packet selected.");
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return;
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}
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follow_info = g_new0(follow_info_t, 1);
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follow_info->follow_type = FOLLOW_TCP;
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/* Create a new filter that matches all packets in the TCP stream,
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and set the display filter entry accordingly */
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reset_tcp_reassembly();
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follow_filter = build_follow_filter(&cfile.edt->pi);
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if (!follow_filter) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Error creating filter for this stream.\n"
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"A transport or network layer header is needed");
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g_free(follow_info);
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return;
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}
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/* Create a temporary file into which to dump the reassembled data
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from the TCP stream, and set "data_out_file" to refer to it, so
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that the TCP code will write to it.
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XXX - it might be nicer to just have the TCP code directly
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append stuff to the text widget for the TCP stream window,
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if we can arrange that said window not pop up until we're
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done. */
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tmp_fd = create_tempfile(&data_out_filename, "follow");
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follow_info->data_out_filename = g_strdup(data_out_filename);
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if (tmp_fd == -1) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Could not create temporary file %s: %s",
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follow_info->data_out_filename, strerror(errno));
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g_free(follow_info->data_out_filename);
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g_free(follow_info);
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g_free(follow_filter);
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return;
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}
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data_out_file = fdopen(tmp_fd, "w+b");
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if (data_out_file == NULL) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Could not create temporary file %s: %s",
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follow_info->data_out_filename, strerror(errno));
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ws_close(tmp_fd);
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ws_unlink(follow_info->data_out_filename);
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g_free(follow_info->data_out_filename);
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g_free(follow_info);
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g_free(follow_filter);
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return;
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}
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/* Set the display filter entry accordingly */
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filter_cm = g_object_get_data(G_OBJECT(top_level), E_DFILTER_CM_KEY);
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filter_te = gtk_bin_get_child(GTK_BIN(filter_cm));
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/* needed in follow_filter_out_stream(), is there a better way? */
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follow_info->filter_te = filter_te;
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/* save previous filter, const since we're not supposed to alter */
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previous_filter =
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(const gchar *)gtk_entry_get_text(GTK_ENTRY(filter_te));
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/* allocate our new filter. API claims g_malloc terminates program on failure */
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/* my calc for max alloc needed is really +10 but when did a few extra bytes hurt ? */
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filter_out_filter_len = (int)(strlen(follow_filter) + strlen(previous_filter) + 16);
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follow_info->filter_out_filter = (gchar *)g_malloc(filter_out_filter_len);
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/* append the negation */
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if(strlen(previous_filter)) {
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g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
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"%s and !(%s)", previous_filter, follow_filter);
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} else {
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g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
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"!(%s)", follow_filter);
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}
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gtk_entry_set_text(GTK_ENTRY(filter_te), follow_filter);
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/* Run the display filter so it goes in effect - even if it's the
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same as the previous display filter. */
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main_filter_packets(&cfile, follow_filter, TRUE);
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/* Free the filter string, as we're done with it. */
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g_free(follow_filter);
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/* Check whether we got any data written to the file. */
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if (empty_tcp_stream) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"The packets in the capture file for that stream have no data.");
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ws_close(tmp_fd);
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ws_unlink(follow_info->data_out_filename);
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g_free(follow_info->data_out_filename);
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g_free(follow_info->filter_out_filter);
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g_free(follow_info);
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return;
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}
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/* Go back to the top of the file and read the first tcp_stream_chunk
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* to ensure that the IP addresses and port numbers in the drop-down
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* list are tied to the correct lines displayed by follow_read_stream()
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* later on (which also reads from this file). Close the file when
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* we're done.
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*
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* We read the data now, before we pop up a window, in case the
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* read fails. We use the data later.
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*/
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rewind(data_out_file);
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nchars=fread(&sc, 1, sizeof(sc), data_out_file);
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if (nchars != sizeof(sc)) {
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if (ferror(data_out_file)) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Could not read from temporary file %s: %s",
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follow_info->data_out_filename, strerror(errno));
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} else {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Short read from temporary file %s: expected %lu, got %lu",
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follow_info->data_out_filename,
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(unsigned long)sizeof(sc),
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(unsigned long)nchars);
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}
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ws_close(tmp_fd);
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ws_unlink(follow_info->data_out_filename);
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g_free(follow_info->data_out_filename);
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g_free(follow_info->filter_out_filter);
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g_free(follow_info);
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return;
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}
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fclose(data_out_file);
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/* The data_out_filename file now has all the text that was in the
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session (this is dumped to file by the TCP dissector). */
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/* Stream to show */
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follow_stats(&stats);
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if (stats.is_ipv6) {
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struct e_in6_addr ipaddr;
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memcpy(&ipaddr, stats.ip_address[0], 16);
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hostname0 = get_hostname6(&ipaddr);
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memcpy(&ipaddr, stats.ip_address[0], 16);
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hostname1 = get_hostname6(&ipaddr);
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} else {
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guint32 ipaddr;
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memcpy(&ipaddr, stats.ip_address[0], 4);
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hostname0 = get_hostname(ipaddr);
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memcpy(&ipaddr, stats.ip_address[1], 4);
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hostname1 = get_hostname(ipaddr);
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}
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follow_info->is_ipv6 = stats.is_ipv6;
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port0 = get_tcp_port(stats.port[0]);
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port1 = get_tcp_port(stats.port[1]);
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/* Host 0 --> Host 1 */
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if(sc.src_port == stats.port[0]) {
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server_to_client_string =
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g_strdup_printf("%s:%s " UTF8_RIGHTWARDS_ARROW " %s:%s (%u bytes)",
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hostname0, port0,
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hostname1, port1,
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stats.bytes_written[0]);
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} else {
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server_to_client_string =
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g_strdup_printf("%s:%s " UTF8_RIGHTWARDS_ARROW " %s:%s (%u bytes)",
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hostname1, port1,
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hostname0,port0,
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stats.bytes_written[0]);
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}
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/* Host 1 --> Host 0 */
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if(sc.src_port == stats.port[1]) {
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client_to_server_string =
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g_strdup_printf("%s:%s " UTF8_RIGHTWARDS_ARROW " %s:%s (%u bytes)",
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hostname0, port0,
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hostname1, port1,
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stats.bytes_written[1]);
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} else {
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client_to_server_string =
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g_strdup_printf("%s:%s " UTF8_RIGHTWARDS_ARROW " %s:%s (%u bytes)",
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hostname1, port1,
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hostname0, port0,
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stats.bytes_written[1]);
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}
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/* Both Stream Directions */
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both_directions_string = g_strdup_printf("Entire conversation (%u bytes)", stats.bytes_written[0] + stats.bytes_written[1]);
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follow_stream("Follow TCP Stream", follow_info, both_directions_string,
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server_to_client_string, client_to_server_string);
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g_free(both_directions_string);
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g_free(server_to_client_string);
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g_free(client_to_server_string);
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data_out_file = NULL;
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}
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#define FLT_BUF_SIZE 1024
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/*
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* XXX - the routine pointed to by "print_line_fcn_p" doesn't get handed lines,
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* it gets handed bufferfuls. That's fine for "follow_write_raw()"
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* and "follow_add_to_gtk_text()", but, as "follow_print_text()" calls
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* the "print_line()" routine from "print.c", and as that routine might
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* genuinely expect to be handed a line (if, for example, it's using
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* some OS or desktop environment's printing API, and that API expects
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* to be handed lines), "follow_print_text()" should probably accumulate
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* lines in a buffer and hand them "print_line()". (If there's a
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* complete line in a buffer - i.e., there's nothing of the line in
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* the previous buffer or the next buffer - it can just hand that to
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* "print_line()" after filtering out non-printables, as an
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* optimization.)
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*
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* This might or might not be the reason why C arrays display
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* correctly but get extra blank lines very other line when printed.
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*/
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frs_return_t
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follow_read_tcp_stream(follow_info_t *follow_info,
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gboolean (*print_line_fcn_p)(char *, size_t, gboolean, void *),
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void *arg)
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{
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tcp_stream_chunk sc;
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size_t bcount;
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size_t bytes_read;
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int iplen;
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guint8 client_addr[MAX_IPADDR_LEN];
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guint16 client_port = 0;
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gboolean is_server;
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guint32 global_client_pos = 0, global_server_pos = 0;
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guint32 server_packet_count = 0;
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guint32 client_packet_count = 0;
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guint32 *global_pos;
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gboolean skip;
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char buffer[FLT_BUF_SIZE+1]; /* +1 to fix ws bug 1043 */
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size_t nchars;
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frs_return_t frs_return;
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iplen = (follow_info->is_ipv6) ? 16 : 4;
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data_out_file = ws_fopen(follow_info->data_out_filename, "rb");
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if (data_out_file == NULL) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Could not open temporary file %s: %s", follow_info->data_out_filename,
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strerror(errno));
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return FRS_OPEN_ERROR;
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}
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while ((nchars=fread(&sc, 1, sizeof(sc), data_out_file))) {
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if (nchars != sizeof(sc)) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Short read from temporary file %s: expected %lu, got %lu",
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follow_info->data_out_filename,
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(unsigned long)sizeof(sc),
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(unsigned long)nchars);
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fclose(data_out_file);
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data_out_file = NULL;
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return FRS_READ_ERROR;
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}
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if (client_port == 0) {
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memcpy(client_addr, sc.src_addr, iplen);
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client_port = sc.src_port;
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}
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skip = FALSE;
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if (memcmp(client_addr, sc.src_addr, iplen) == 0 &&
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client_port == sc.src_port) {
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is_server = FALSE;
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global_pos = &global_client_pos;
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if (follow_info->show_stream == FROM_SERVER) {
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skip = TRUE;
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}
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}
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else {
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is_server = TRUE;
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global_pos = &global_server_pos;
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if (follow_info->show_stream == FROM_CLIENT) {
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skip = TRUE;
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}
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}
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bytes_read = 0;
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while (bytes_read < sc.dlen) {
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bcount = ((sc.dlen-bytes_read) < FLT_BUF_SIZE) ? (sc.dlen-bytes_read) : FLT_BUF_SIZE;
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nchars = fread(buffer, 1, bcount, data_out_file);
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if (nchars == 0)
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break;
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/* XXX - if we don't get "bcount" bytes, is that an error? */
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bytes_read += nchars;
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if (!skip) {
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frs_return = follow_show(follow_info, print_line_fcn_p, buffer,
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nchars, is_server, arg, global_pos,
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&server_packet_count,
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&client_packet_count);
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if(frs_return == FRS_PRINT_ERROR) {
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fclose(data_out_file);
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data_out_file = NULL;
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return frs_return;
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}
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}
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}
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}
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if (ferror(data_out_file)) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Error reading temporary file %s: %s", follow_info->data_out_filename,
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strerror(errno));
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fclose(data_out_file);
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data_out_file = NULL;
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return FRS_READ_ERROR;
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}
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fclose(data_out_file);
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data_out_file = NULL;
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return FRS_OK;
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}
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