forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
Create a "registration" system for Follow functionality so most of the work can be abstracted into a dissector and GUI can just be responsible for "display". This also removes the global variables in follow.c to open up multithreading possibilities. TCP, UDP and HTTP all have the same "tap interface" for Follow functionality (passing a tvb with byte data to "follow"). SSL still has it's own behavior, so Follow structures have to take that into account. TShark through the Follow registration now has support for HTTP. The only thing possibly missing is dynamic menu generation to further reduce explicit knowledge of Follow "type" (and rely on registration) Bug: 11988 Change-Id: I559d9ee1312406ad0986d4dce9fa67ea2103b339 Reviewed-on: https://code.wireshark.org/review/13161 Reviewed-by: Michael Mann <mmann78@netscape.net>
213 lines
6.6 KiB
C
213 lines
6.6 KiB
C
/* follow.c
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*
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* Copyright 1998 Mike Hall <mlh@io.com>
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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 USA.
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*
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*/
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#include "config.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 "follow.h"
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#include <epan/tap.h>
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struct register_follow {
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int proto_id; /* protocol id (0-indexed) */
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const char* tap_listen_str; /* string used in register_tap_listener */
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follow_conv_filter_func conv_filter; /* generate "conversation" filter to follow */
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follow_index_filter_func index_filter; /* generate stream/index filter to follow */
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follow_address_filter_func address_filter; /* generate address filter to follow */
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follow_port_to_display_func port_to_display; /* port to name resolution for follow type */
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follow_tap_func tap_handler; /* tap listener handler */
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};
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static GSList *registered_followers = NULL;
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static gint
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insert_sorted_by_name(gconstpointer aparam, gconstpointer bparam)
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{
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const register_follow_t *a = (const register_follow_t *)aparam;
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const register_follow_t *b = (const register_follow_t *)bparam;
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return g_ascii_strcasecmp(proto_get_protocol_short_name(find_protocol_by_id(a->proto_id)), proto_get_protocol_short_name(find_protocol_by_id(b->proto_id)));
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}
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void register_follow_stream(const int proto_id, const char* tap_listener,
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follow_conv_filter_func conv_filter, follow_index_filter_func index_filter, follow_address_filter_func address_filter,
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follow_port_to_display_func port_to_display, follow_tap_func tap_handler)
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{
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register_follow_t *follower;
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DISSECTOR_ASSERT(tap_listener);
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DISSECTOR_ASSERT(conv_filter);
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DISSECTOR_ASSERT(index_filter);
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DISSECTOR_ASSERT(address_filter);
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DISSECTOR_ASSERT(port_to_display);
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DISSECTOR_ASSERT(tap_handler);
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follower = g_new(register_follow_t,1);
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follower->proto_id = proto_id;
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follower->tap_listen_str = tap_listener;
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follower->conv_filter = conv_filter;
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follower->index_filter = index_filter;
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follower->address_filter = address_filter;
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follower->port_to_display = port_to_display;
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follower->tap_handler = tap_handler;
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registered_followers = g_slist_insert_sorted(registered_followers, follower, insert_sorted_by_name);
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}
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int get_follow_proto_id(register_follow_t* follower)
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{
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if (follower == NULL)
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return -1;
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return follower->proto_id;
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}
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const char* get_follow_tap_string(register_follow_t* follower)
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{
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if (follower == NULL)
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return "";
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return follower->tap_listen_str;
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}
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follow_conv_filter_func get_follow_conv_func(register_follow_t* follower)
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{
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return follower->conv_filter;
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}
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follow_index_filter_func get_follow_index_func(register_follow_t* follower)
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{
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return follower->index_filter;
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}
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follow_address_filter_func get_follow_address_func(register_follow_t* follower)
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{
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return follower->address_filter;
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}
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follow_port_to_display_func get_follow_port_to_display(register_follow_t* follower)
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{
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return follower->port_to_display;
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}
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follow_tap_func get_follow_tap_handler(register_follow_t* follower)
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{
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return follower->tap_handler;
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}
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register_follow_t* get_follow_by_name(const char* proto_short_name)
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{
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guint i, size = g_slist_length(registered_followers);
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register_follow_t *follower;
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GSList *slist;
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for (i = 0; i < size; i++) {
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slist = g_slist_nth(registered_followers, i);
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follower = (register_follow_t*)slist->data;
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if (strcmp(proto_short_name, proto_get_protocol_short_name(find_protocol_by_id(follower->proto_id))) == 0)
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return follower;
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}
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return NULL;
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}
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void follow_iterate_followers(GFunc func, gpointer user_data)
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{
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g_slist_foreach(registered_followers, func, user_data);
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}
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gchar* follow_get_stat_tap_string(register_follow_t* follower)
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{
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GString *cmd_str = g_string_new("follow,");
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g_string_append(cmd_str, proto_get_protocol_filter_name(follower->proto_id));
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return g_string_free(cmd_str, FALSE);
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}
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/* here we are going to try and reconstruct the data portion of a TCP
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session. We will try and handle duplicates, TCP fragments, and out
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of order packets in a smart way. */
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void
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follow_reset_stream(follow_info_t* info)
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{
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info->bytes_written[0] = info->bytes_written[1] = 0;
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info->client_port = 0;
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info->server_port = 0;
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info->client_ip.type = FT_NONE;
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info->client_ip.len = 0;
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info->server_ip.type = FT_NONE;
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info->server_ip.len = 0;
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}
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gboolean
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follow_tvb_tap_listener(void *tapdata, packet_info *pinfo,
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epan_dissect_t *edt _U_, const void *data)
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{
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follow_record_t *follow_record;
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follow_info_t *follow_info = (follow_info_t *)tapdata;
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tvbuff_t *next_tvb = (tvbuff_t *)data;
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follow_record = g_new(follow_record_t,1);
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follow_record->data = g_byte_array_sized_new(tvb_captured_length(next_tvb));
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follow_record->data = g_byte_array_append(follow_record->data,
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tvb_get_ptr(next_tvb, 0, -1),
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tvb_captured_length(next_tvb));
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if (follow_info->client_port == 0) {
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follow_info->client_port = pinfo->srcport;
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copy_address(&follow_info->client_ip, &pinfo->src);
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follow_info->server_port = pinfo->destport;
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copy_address(&follow_info->server_ip, &pinfo->dst);
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}
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if (addresses_equal(&follow_info->client_ip, &pinfo->src) && follow_info->client_port == pinfo->srcport)
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follow_record->is_server = FALSE;
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else
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follow_record->is_server = TRUE;
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/* update stream counter */
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follow_info->bytes_written[follow_record->is_server] += follow_record->data->len;
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follow_info->payload = g_list_append(follow_info->payload, follow_record);
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return FALSE;
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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