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/* follow.c
*
* Copyright 1998 Mike Hall <mlh@io.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include "follow.h"
#include <epan/tap.h>
struct register_follow {
int proto_id; /* protocol id (0-indexed) */
const char* tap_listen_str; /* string used in register_tap_listener */
follow_conv_filter_func conv_filter; /* generate "conversation" filter to follow */
follow_index_filter_func index_filter; /* generate stream/index filter to follow */
follow_address_filter_func address_filter; /* generate address filter to follow */
follow_port_to_display_func port_to_display; /* port to name resolution for follow type */
tap_packet_cb tap_handler; /* tap listener handler */
follow_stream_count_func stream_count; /* maximum stream count, used for UI */
follow_sub_stream_id_func sub_stream_id; /* sub-stream id, used for UI */
};
static wmem_tree_t *registered_followers = NULL;
void register_follow_stream(const int proto_id, const char* tap_listener,
follow_conv_filter_func conv_filter, follow_index_filter_func index_filter, follow_address_filter_func address_filter,
follow_port_to_display_func port_to_display, tap_packet_cb tap_handler,
follow_stream_count_func stream_count, follow_sub_stream_id_func sub_stream_id)
{
register_follow_t *follower;
DISSECTOR_ASSERT(tap_listener);
DISSECTOR_ASSERT(conv_filter);
DISSECTOR_ASSERT(index_filter);
DISSECTOR_ASSERT(address_filter);
DISSECTOR_ASSERT(port_to_display);
DISSECTOR_ASSERT(tap_handler);
follower = wmem_new(wmem_epan_scope(), register_follow_t);
follower->proto_id = proto_id;
follower->tap_listen_str = tap_listener;
follower->conv_filter = conv_filter;
follower->index_filter = index_filter;
follower->address_filter = address_filter;
follower->port_to_display = port_to_display;
follower->tap_handler = tap_handler;
follower->stream_count = stream_count;
follower->sub_stream_id = sub_stream_id;
if (registered_followers == NULL)
registered_followers = wmem_tree_new(wmem_epan_scope());
wmem_tree_insert_string(registered_followers, proto_get_protocol_short_name(find_protocol_by_id(proto_id)), follower, 0);
}
int get_follow_proto_id(register_follow_t* follower)
{
if (follower == NULL)
return -1;
return follower->proto_id;
}
const char* get_follow_tap_string(register_follow_t* follower)
{
if (follower == NULL)
return "";
return follower->tap_listen_str;
}
follow_conv_filter_func get_follow_conv_func(register_follow_t* follower)
{
return follower->conv_filter;
}
follow_index_filter_func get_follow_index_func(register_follow_t* follower)
{
return follower->index_filter;
}
follow_address_filter_func get_follow_address_func(register_follow_t* follower)
{
return follower->address_filter;
}
follow_port_to_display_func get_follow_port_to_display(register_follow_t* follower)
{
return follower->port_to_display;
}
tap_packet_cb get_follow_tap_handler(register_follow_t* follower)
{
return follower->tap_handler;
}
follow_stream_count_func get_follow_stream_count_func(register_follow_t* follower)
{
return follower->stream_count;
}
follow_sub_stream_id_func get_follow_sub_stream_id_func(register_follow_t* follower)
{
return follower->sub_stream_id;
}
register_follow_t* get_follow_by_name(const char* proto_short_name)
{
return (register_follow_t*)wmem_tree_lookup_string(registered_followers, proto_short_name, 0);
}
register_follow_t* get_follow_by_proto_id(const int proto_id)
{
protocol_t *protocol = find_protocol_by_id(proto_id);
if (protocol == NULL) {
return NULL;
}
return (register_follow_t*)wmem_tree_lookup_string(registered_followers, proto_get_protocol_short_name(protocol), 0);
}
void follow_iterate_followers(wmem_foreach_func func, gpointer user_data)
{
wmem_tree_foreach(registered_followers, func, user_data);
}
gchar* follow_get_stat_tap_string(register_follow_t* follower)
{
GString *cmd_str = g_string_new("follow,");
g_string_append(cmd_str, proto_get_protocol_filter_name(follower->proto_id));
return g_string_free(cmd_str, FALSE);
}
/* here we are going to try and reconstruct the data portion of a TCP
session. We will try and handle duplicates, TCP fragments, and out
of order packets in a smart way. */
void
follow_reset_stream(follow_info_t* info)
{
info->bytes_written[0] = info->bytes_written[1] = 0;
info->client_port = 0;
info->server_port = 0;
info->client_ip.type = FT_NONE;
info->client_ip.len = 0;
info->server_ip.type = FT_NONE;
info->server_ip.len = 0;
info->fragments[0] = info->fragments[1] = NULL;
info->seq[0] = info->seq[1] = 0;
info->substream_id = SUBSTREAM_UNUSED;
}
void
follow_info_free(follow_info_t* follow_info)
{
GList *cur;
follow_record_t *follow_record;
for (cur = follow_info->payload; cur; cur = g_list_next(cur)) {
if(cur->data) {
follow_record = (follow_record_t *)cur->data;
if(follow_record->data)
g_byte_array_free(follow_record->data, TRUE);
g_free(follow_record);
}
}
g_list_free(follow_info->payload);
//Only TCP stream uses fragments
for (cur = follow_info->fragments[0]; cur; cur = g_list_next(cur)) {
follow_record = (follow_record_t *)cur->data;
if(follow_record->data) {
g_byte_array_free(follow_record->data, TRUE);
}
g_free(follow_record);
}
for (cur = follow_info->fragments[1]; cur; cur = g_list_next(cur)) {
follow_record = (follow_record_t *)cur->data;
if(follow_record->data) {
g_byte_array_free(follow_record->data, TRUE);
}
g_free(follow_record);
}
free_address(&follow_info->client_ip);
free_address(&follow_info->server_ip);
g_free(follow_info->filter_out_filter);
g_free(follow_info);
}
tap_packet_status
follow_tvb_tap_listener(void *tapdata, packet_info *pinfo,
epan_dissect_t *edt _U_, const void *data, tap_flags_t flags _U_)
{
follow_record_t *follow_record;
follow_info_t *follow_info = (follow_info_t *)tapdata;
tvbuff_t *next_tvb = (tvbuff_t *)data;
follow_record = g_new(follow_record_t,1);
follow_record->data = g_byte_array_sized_new(tvb_captured_length(next_tvb));
follow_record->data = g_byte_array_append(follow_record->data,
tvb_get_ptr(next_tvb, 0, -1),
tvb_captured_length(next_tvb));
follow_record->packet_num = pinfo->fd->num;
follow_record->abs_ts = pinfo->fd->abs_ts;
if (follow_info->client_port == 0) {
follow_info->client_port = pinfo->srcport;
copy_address(&follow_info->client_ip, &pinfo->src);
follow_info->server_port = pinfo->destport;
copy_address(&follow_info->server_ip, &pinfo->dst);
}
if (addresses_equal(&follow_info->client_ip, &pinfo->src) && follow_info->client_port == pinfo->srcport)
follow_record->is_server = FALSE;
else
follow_record->is_server = TRUE;
/* update stream counter */
follow_info->bytes_written[follow_record->is_server] += follow_record->data->len;
follow_info->payload = g_list_prepend(follow_info->payload, follow_record);
return TAP_PACKET_DONT_REDRAW;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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