449 lines
16 KiB
C
449 lines
16 KiB
C
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/* packet-udpcp.c
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*
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* Routines for UDPCP packet dissection (UDP-based reliable communication protocol).
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* Described in the Open Base Station Initiative Reference Point 1 Specification
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* (see http://www.obsai.com/specs/RP1%20Spec%20v2_1.pdf, Appendix A)
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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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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/* TODO:
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* - Check for expected Acks and link between Data and Ack frames
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* - Verify length parameter against remaining payload
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* - Calculate/verify Checksum field
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* - Sequence number analysis, i.e.
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* - check next expected Msg Id
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* - flag out-of-order Fragment Number within a MsgId?
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* - Duplicate Message Detection (A.3.2.4)
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* */
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#include <stdio.h>
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#include "config.h"
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#include <epan/conversation.h>
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#include <epan/reassemble.h>
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#include <epan/prefs.h>
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void proto_register_udpcp(void);
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static int proto_udpcp = -1;
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static int hf_udpcp_checksum = -1;
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static int hf_udpcp_msg_type = -1;
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static int hf_udpcp_version = -1;
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static int hf_udpcp_n = -1;
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static int hf_udpcp_c = -1;
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static int hf_udpcp_s = -1;
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static int hf_udpcp_d = -1;
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static int hf_udpcp_reserved = -1;
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static int hf_udpcp_fragment_amount = -1;
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static int hf_udpcp_fragment_number = -1;
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static int hf_udpcp_message_id = -1;
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static int hf_udpcp_message_data_length = -1;
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static int hf_udpcp_payload = -1;
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/* For reassembly */
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static int hf_udpcp_fragments = -1;
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static int hf_udpcp_fragment = -1;
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static int hf_udpcp_fragment_overlap = -1;
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static int hf_udpcp_fragment_overlap_conflict = -1;
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static int hf_udpcp_fragment_multiple_tails = -1;
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static int hf_udpcp_fragment_too_long_fragment = -1;
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static int hf_udpcp_fragment_error = -1;
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static int hf_udpcp_fragment_count = -1;
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static int hf_udpcp_reassembled_in = -1;
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static int hf_udpcp_reassembled_length = -1;
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static int hf_udpcp_reassembled_data = -1;
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/* Subtrees */
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static gint ett_udpcp = -1;
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static gint ett_udpcp_fragments = -1;
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static gint ett_udpcp_fragment = -1;
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static const fragment_items udpcp_frag_items = {
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&ett_udpcp_fragment,
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&ett_udpcp_fragments,
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&hf_udpcp_fragments,
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&hf_udpcp_fragment,
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&hf_udpcp_fragment_overlap,
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&hf_udpcp_fragment_overlap_conflict,
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&hf_udpcp_fragment_multiple_tails,
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&hf_udpcp_fragment_too_long_fragment,
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&hf_udpcp_fragment_error,
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&hf_udpcp_fragment_count,
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&hf_udpcp_reassembled_in,
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&hf_udpcp_reassembled_length,
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&hf_udpcp_reassembled_data,
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"UDPCP fragments"
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};
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static dissector_handle_t udpcp_handle;
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void proto_reg_handoff_udpcp (void);
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/* User definable values */
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static range_t *global_udpcp_port_range = NULL;
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#define DATA_FORMAT 0x01
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#define ACK_FORMAT 0x02
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static const value_string msg_type_vals[] = {
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{ DATA_FORMAT, "Data Packet" },
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{ ACK_FORMAT, "Ack Packet" },
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{ 0, NULL }
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};
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/* Reassembly table. */
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static reassembly_table udpcp_reassembly_table;
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static guint udpcp_hash(gconstpointer k _U_)
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{
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return GPOINTER_TO_UINT(k);
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}
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static gint udpcp_equal(gconstpointer k1, gconstpointer k2)
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{
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return k1 == k2;
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}
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static gpointer udpcp_temporary_key(const packet_info *pinfo _U_, const guint32 id _U_, const void *data _U_)
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{
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return (gpointer)data;
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}
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static gpointer udpcp_persistent_key(const packet_info *pinfo _U_, const guint32 id _U_,
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const void *data)
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{
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return (gpointer)data;
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}
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static void udpcp_free_temporary_key(gpointer ptr _U_)
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{
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}
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static void udpcp_free_persistent_key(gpointer ptr _U_)
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{
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}
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reassembly_table_functions udpcp_reassembly_table_functions =
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{
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udpcp_hash,
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udpcp_equal,
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udpcp_temporary_key,
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udpcp_persistent_key,
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udpcp_free_temporary_key,
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udpcp_free_persistent_key
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};
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/**************************************************************************/
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/* Preferences state */
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/**************************************************************************/
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/* Reassemble by default */
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static gboolean global_udpcp_reassemble = TRUE;
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/* By default do try to decode payload as XML/SOAP */
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static gboolean global_udpcp_decode_payload_as_soap = TRUE;
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/******************************/
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/* Main dissection function. */
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static int
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dissect_udpcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *udpcp_tree;
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proto_item *root_ti;
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gint offset = 0;
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/* Must be at least 12 bytes */
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if (tvb_reported_length(tvb) < 12) {
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return 0;
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}
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/* Must be Data or Ack format. */
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guint32 msg_type = tvb_get_guint8(tvb, 4) >> 6;
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if (msg_type != DATA_FORMAT && msg_type != ACK_FORMAT) {
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return 0;
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}
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/* Protocol root */
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root_ti = proto_tree_add_item(tree, proto_udpcp, tvb, offset, -1, ENC_NA);
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udpcp_tree = proto_item_add_subtree(root_ti, ett_udpcp);
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/* Checksum */
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proto_tree_add_item(udpcp_tree, hf_udpcp_checksum, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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/* Msg-type */
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proto_tree_add_item_ret_uint(udpcp_tree, hf_udpcp_msg_type, tvb, offset, 1, ENC_BIG_ENDIAN, &msg_type);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
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(msg_type == 0x01) ? "[Data] " : "[Ack] ");
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/* Version */
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proto_tree_add_item(udpcp_tree, hf_udpcp_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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/* Packet Transfer Options */
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guint32 n, s;
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proto_tree_add_item_ret_uint(udpcp_tree, hf_udpcp_n, tvb, offset, 1, ENC_BIG_ENDIAN, &n);
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proto_tree_add_item(udpcp_tree, hf_udpcp_c, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item_ret_uint(udpcp_tree, hf_udpcp_s, tvb, offset, 1, ENC_BIG_ENDIAN, &s);
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offset++;
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proto_tree_add_item(udpcp_tree, hf_udpcp_d, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(udpcp_tree, hf_udpcp_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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/* Fragment Amount & Fragment Number */
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guint32 fragment_amount, fragment_number;
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proto_tree_add_item_ret_uint(udpcp_tree, hf_udpcp_fragment_amount, tvb, offset, 1, ENC_BIG_ENDIAN, &fragment_amount);
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offset++;
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proto_tree_add_item_ret_uint(udpcp_tree, hf_udpcp_fragment_number, tvb, offset, 1, ENC_BIG_ENDIAN, &fragment_number);
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offset++;
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/* Message ID & Message Data Length */
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guint32 message_id;
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proto_tree_add_item_ret_uint(udpcp_tree, hf_udpcp_message_id, tvb, offset, 2, ENC_BIG_ENDIAN, &message_id);
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col_append_fstr(pinfo->cinfo, COL_INFO, " Msg_ID=%3u", message_id);
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offset += 2;
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guint32 data_length;
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proto_tree_add_item_ret_uint(udpcp_tree, hf_udpcp_message_data_length, tvb, offset, 2, ENC_BIG_ENDIAN, &data_length);
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offset += 2;
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/* Data could follow here */
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if (msg_type == DATA_FORMAT) {
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if (!data_length) {
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/* This could just be a sync frame */
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if (message_id == 0 && n==0 && s==0) {
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col_append_str(pinfo->cinfo, COL_INFO, " [Sync]");
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}
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/* Nothing more to show here */
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return offset;
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}
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/* Show fragment numbering. Ignore confusing 0-based fragment numbering.. */
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col_append_fstr(pinfo->cinfo, COL_INFO, " [Frag %u/%u]",
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fragment_number+1, fragment_amount);
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/* There is data */
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if ((fragment_amount == 1) && (fragment_number == 0)) {
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/* Not fragmented - show payload now */
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proto_tree_add_item(udpcp_tree, hf_udpcp_payload, tvb, offset, -1, ENC_ASCII);
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col_append_fstr(pinfo->cinfo, COL_INFO, " Data (%u bytes)", data_length);
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if (global_udpcp_decode_payload_as_soap) {
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/* Send to XML dissector */
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dissector_handle_t xml_handle = find_dissector("xml");
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tvbuff_t *next_tvb = tvb_new_subset_remaining(tvb, offset);
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call_dissector_only(xml_handle, next_tvb, pinfo, tree, NULL);
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}
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}
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else {
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/* Fragmented */
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if (global_udpcp_reassemble) {
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/* Reassembly */
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/* Set fragmented flag. */
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gboolean save_fragmented = pinfo->fragmented;
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pinfo->fragmented = TRUE;
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fragment_head *fh;
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guint frag_data_len = tvb_reported_length_remaining(tvb, offset);
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/* Add this fragment into reassembly */
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fh = fragment_add_seq_check(&udpcp_reassembly_table, tvb, offset, pinfo,
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message_id, /* id */
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GUINT_TO_POINTER(message_id), /* data */
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fragment_number, /* frag_number */
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frag_data_len, /* frag_data_len */
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(fragment_number < (fragment_amount-1)) /* more_frags */
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);
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gboolean update_col_info = TRUE;
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/* See if this completes a PDU */
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tvbuff_t *next_tvb = process_reassembled_data(tvb, offset, pinfo, "Reassembled UDPCP Payload",
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fh, &udpcp_frag_items,
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&update_col_info, udpcp_tree);
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if (next_tvb) {
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/* Have reassembled data */
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proto_tree_add_item(udpcp_tree, hf_udpcp_payload, next_tvb, 0, -1, ENC_ASCII);
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col_append_fstr(pinfo->cinfo, COL_INFO, " Reassembled Data (%u bytes)", data_length);
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if (global_udpcp_decode_payload_as_soap) {
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/* Send to XML dissector */
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dissector_handle_t xml_handle = find_dissector("xml");
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call_dissector_only(xml_handle, next_tvb, pinfo, tree, NULL);
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}
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}
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/* Restore fragmented flag */
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pinfo->fragmented = save_fragmented;
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}
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}
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}
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return offset;
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}
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void
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proto_register_udpcp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_udpcp_checksum,
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{ "Checksum", "udpcp.checksum", FT_UINT32, BASE_HEX,
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NULL, 0x0, "Adler32 checksum", HFILL }},
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{ &hf_udpcp_msg_type,
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{ "Msg Type", "udpcp.msg-type", FT_UINT8, BASE_HEX,
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VALS(msg_type_vals), 0xc0, NULL, HFILL }},
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{ &hf_udpcp_version,
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{ "Version", "udpcp.version", FT_UINT8, BASE_HEX,
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NULL, 0x38, NULL, HFILL }},
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{ &hf_udpcp_n,
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{ "N", "udpcp.n", FT_UINT8, BASE_HEX,
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NULL, 0x04, "Along with S bit, indicates whether acknowledgements should be sent", HFILL }},
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{ &hf_udpcp_c,
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{ "C", "udpcp.c", FT_UINT8, BASE_HEX,
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NULL, 0x02, "When set, the checksum should be valid", HFILL }},
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{ &hf_udpcp_s,
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{ "S", "udpcp.s", FT_UINT8, BASE_HEX,
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NULL, 0x01, "Along with N bit, indicates whether acknowledgements should be sent", HFILL }},
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{ &hf_udpcp_d,
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{ "D", "udpcp.d", FT_UINT8, BASE_HEX,
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NULL, 0x80, "For ACK, indicates duplicate ACK", HFILL }},
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{ &hf_udpcp_reserved,
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{ "Reserved", "udpcp.reserved", FT_UINT8, BASE_HEX,
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NULL, 0x7f, "Shall be set to 0", HFILL }},
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{ &hf_udpcp_fragment_amount,
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{ "Fragment Amount", "udpcp.fragment-amount", FT_UINT8, BASE_DEC,
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NULL, 0x0, "Total number of fragments of a mesage", HFILL }},
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{ &hf_udpcp_fragment_number,
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{ "Fragment Number", "udpcp.fragment-number", FT_UINT8, BASE_DEC,
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NULL, 0x0, "Fragment number of current packet within msg. Starts at 0", HFILL }},
|
||
|
|
|
||
|
|
{ &hf_udpcp_message_id,
|
||
|
|
{ "Message ID", "udpcp.message-id", FT_UINT16, BASE_DEC,
|
||
|
|
NULL, 0x0, NULL, HFILL }},
|
||
|
|
{ &hf_udpcp_message_data_length,
|
||
|
|
{ "Message Data Length", "udpcp.message-data-length", FT_UINT16, BASE_DEC,
|
||
|
|
NULL, 0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_udpcp_payload,
|
||
|
|
{ "Payload", "udpcp.payload", FT_BYTES, BASE_SHOW_ASCII_PRINTABLE,
|
||
|
|
NULL, 0x0, "Complete or reassembled payload", HFILL }},
|
||
|
|
|
||
|
|
/* Reassembly */
|
||
|
|
{ &hf_udpcp_fragment,
|
||
|
|
{ "Fragment", "udpcp.fragment", FT_FRAMENUM, BASE_NONE,
|
||
|
|
NULL, 0x0, NULL, HFILL }},
|
||
|
|
{ &hf_udpcp_fragments,
|
||
|
|
{ "Fragments", "udpcp.fragments", FT_BYTES, BASE_NONE,
|
||
|
|
NULL, 0x0, NULL, HFILL }},
|
||
|
|
{ &hf_udpcp_fragment_overlap,
|
||
|
|
{ "Fragment overlap", "udpcp.fragment.overlap", FT_BOOLEAN, BASE_NONE,
|
||
|
|
NULL, 0x0, "Fragment overlaps with other fragments", HFILL }},
|
||
|
|
{ &hf_udpcp_fragment_overlap_conflict,
|
||
|
|
{ "Conflicting data in fragment overlap", "udpcp.fragment.overlap.conflict",
|
||
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
||
|
|
"Overlapping fragments contained conflicting data", HFILL }},
|
||
|
|
{ &hf_udpcp_fragment_multiple_tails,
|
||
|
|
{ "Multiple tail fragments found", "udpcp.fragment.multipletails",
|
||
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
||
|
|
"Several tails were found when defragmenting the packet", HFILL }},
|
||
|
|
{ &hf_udpcp_fragment_too_long_fragment,
|
||
|
|
{ "Fragment too long", "udpcp.fragment.toolongfragment",
|
||
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
||
|
|
"Fragment contained data past end of packet", HFILL }},
|
||
|
|
{ &hf_udpcp_fragment_error,
|
||
|
|
{ "Defragmentation error", "udpcp.fragment.error", FT_FRAMENUM, BASE_NONE,
|
||
|
|
NULL, 0x0, "Defragmentation error due to illegal fragments", HFILL }},
|
||
|
|
{ &hf_udpcp_fragment_count,
|
||
|
|
{ "Fragment count", "udpcp.fragment.count", FT_UINT32, BASE_DEC,
|
||
|
|
NULL, 0x0, NULL, HFILL }},
|
||
|
|
{ &hf_udpcp_reassembled_in,
|
||
|
|
{ "Reassembled payload in frame", "udpcp.reassembled_in", FT_FRAMENUM, BASE_NONE,
|
||
|
|
NULL, 0x0, "This payload packet is reassembled in this frame", HFILL }},
|
||
|
|
{ &hf_udpcp_reassembled_length,
|
||
|
|
{ "Reassembled payload length", "udpcp.reassembled.length", FT_UINT32, BASE_DEC,
|
||
|
|
NULL, 0x0, "The total length of the reassembled payload", HFILL }},
|
||
|
|
{ &hf_udpcp_reassembled_data,
|
||
|
|
{ "Reassembled codeblocks", "udpcp.reassembled.data", FT_BYTES, BASE_NONE,
|
||
|
|
NULL, 0x0, "The reassembled payload", HFILL }},
|
||
|
|
};
|
||
|
|
|
||
|
|
static gint *ett[] = {
|
||
|
|
&ett_udpcp,
|
||
|
|
&ett_udpcp_fragments,
|
||
|
|
&ett_udpcp_fragment
|
||
|
|
};
|
||
|
|
|
||
|
|
module_t *udpcp_module;
|
||
|
|
|
||
|
|
proto_udpcp = proto_register_protocol("UDPCP", "UDPCP", "udpcp");
|
||
|
|
proto_register_field_array(proto_udpcp, hf, array_length(hf));
|
||
|
|
proto_register_subtree_array(ett, array_length(ett));
|
||
|
|
|
||
|
|
udpcp_handle = register_dissector("udpcp", dissect_udpcp, proto_udpcp);
|
||
|
|
|
||
|
|
/* Register reassembly table. */
|
||
|
|
reassembly_table_register(&udpcp_reassembly_table,
|
||
|
|
&udpcp_reassembly_table_functions);
|
||
|
|
|
||
|
|
/* Preferences */
|
||
|
|
udpcp_module = prefs_register_protocol(proto_udpcp, NULL);
|
||
|
|
|
||
|
|
/* Payload reassembly */
|
||
|
|
prefs_register_bool_preference(udpcp_module, "attempt_reassembly",
|
||
|
|
"Reassemble payload",
|
||
|
|
"",
|
||
|
|
&global_udpcp_reassemble);
|
||
|
|
|
||
|
|
/* Whether to try XML dissector on payload.
|
||
|
|
* TODO: are there any other payload types we might see? */
|
||
|
|
prefs_register_bool_preference(udpcp_module, "attempt_xml_decode",
|
||
|
|
"Call XML dissector for payload",
|
||
|
|
"",
|
||
|
|
&global_udpcp_decode_payload_as_soap);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
apply_udpcp_prefs(void)
|
||
|
|
{
|
||
|
|
global_udpcp_port_range = prefs_get_range_value("udpcp", "udp.port");
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
proto_reg_handoff_udpcp(void)
|
||
|
|
{
|
||
|
|
dissector_add_uint_range_with_preference("udp.port", "", udpcp_handle);
|
||
|
|
apply_udpcp_prefs();
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
||
|
|
*
|
||
|
|
* Local variables:
|
||
|
|
* c-basic-offset: 4
|
||
|
|
* tab-width: 8
|
||
|
|
* indent-tabs-mode: nil
|
||
|
|
* End:
|
||
|
|
*
|
||
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
||
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
||
|
|
*/
|