forked from osmocom/wireshark
![Hadriel Kaplan](/assets/img/avatar_default.png)
Provide a way for Lua-based dissectors to invoke tcp_dissect_pdus() to make TCP-based dissection easier. Bug: 9851 Change-Id: I91630ebf1f1fc1964118b6750cc34238e18a8ad3 Reviewed-on: https://code.wireshark.org/review/6778 Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com> Reviewed-by: Hadriel Kaplan <hadrielk@yahoo.com> Tested-by: Hadriel Kaplan <hadrielk@yahoo.com>
527 lines
17 KiB
C
527 lines
17 KiB
C
/* packet-hpfeeds.c
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* Routines for Honeypot Protocol Feeds packet disassembly
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* Copyright 2013, Sebastiano DI PAOLA - <sebastiano.dipaola@gmail.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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* Additional information regarding hpfeeds protocol can be found here
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* https://redmine.honeynet.org/projects/hpfeeds/wiki
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/tap.h>
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#include <epan/stats_tree.h>
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#include <epan/wmem/wmem_list.h>
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#include "packet-tcp.h"
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struct HpfeedsTap {
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guint payload_size;
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guint8* channel;
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guint8 opcode;
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};
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static int hpfeeds_tap = -1;
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static const guint8* st_str_channels_payload = "Payload size per channel";
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static const guint8* st_str_opcodes = "Opcodes";
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static int st_node_channels_payload = -1;
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static int st_node_opcodes = -1;
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static wmem_list_t* channels_list;
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struct channel_node {
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guint8* channel;
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guint st_node_channel_payload;
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};
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void proto_register_hpfeeds(void);
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void proto_reg_handoff_hpfeeds(void);
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static heur_dissector_list_t heur_subdissector_list;
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/* Preferences */
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static guint hpfeeds_port_pref = 0;
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static gboolean hpfeeds_desegment = TRUE;
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static gboolean try_heuristic = TRUE;
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static int proto_hpfeeds = -1;
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static int hf_hpfeeds_opcode = -1;
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static int hf_hpfeeds_msg_length = -1;
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static int hf_hpfeeds_nonce = -1;
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static int hf_hpfeeds_secret = -1;
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static int hf_hpfeeds_payload = -1;
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static int hf_hpfeeds_server_len = -1;
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static int hf_hpfeeds_server = -1;
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static int hf_hpfeeds_ident_len = -1;
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static int hf_hpfeeds_ident = -1;
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static int hf_hpfeeds_channel = -1;
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static int hf_hpfeeds_chan_len = -1;
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static int hf_hpfeeds_errmsg = -1;
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static gint ett_hpfeeds = -1;
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static expert_field ei_hpfeeds_opcode_unknown = EI_INIT;
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/* OPCODE */
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#define OP_ERROR 0 /* error message*/
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#define OP_INFO 1 /* server name, nonce */
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#define OP_AUTH 2 /* client id, sha1(nonce+authkey) */
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#define OP_PUBLISH 3 /* client id, channelname, payload */
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#define OP_SUBSCRIBE 4 /* client id, channelname*/
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/* OFFSET FOR HEADER */
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#define HPFEEDS_HDR_LEN 5
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static const value_string opcode_vals[] = {
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{ OP_ERROR, "Error" },
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{ OP_INFO, "Info" },
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{ OP_AUTH, "Auth" },
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{ OP_PUBLISH, "Publish" },
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{ OP_SUBSCRIBE, "Subscribe" },
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{ 0, NULL },
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};
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static void
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dissect_hpfeeds_error_pdu(tvbuff_t *tvb, proto_tree *tree, guint offset)
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{
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proto_tree_add_item(tree, hf_hpfeeds_errmsg, tvb, offset, -1, ENC_ASCII|ENC_NA);
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}
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static void
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dissect_hpfeeds_info_pdu(tvbuff_t *tvb, proto_tree *tree, guint offset)
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{
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guint8 len = 0;
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proto_tree *data_subtree;
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guint8 *strptr = NULL;
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len = tvb_get_guint8(tvb, offset);
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/* don't move the offset yet as we need to get data after this operation */
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strptr = tvb_get_string_enc(wmem_packet_scope(), tvb, offset + 1, len, ENC_ASCII);
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data_subtree = proto_tree_add_subtree_format(tree, tvb, offset, -1, ett_hpfeeds, NULL, "Broker: %s", strptr);
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proto_tree_add_item(data_subtree, hf_hpfeeds_server_len, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(data_subtree, hf_hpfeeds_server, tvb, offset, len,
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ENC_ASCII|ENC_NA);
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offset += len;
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proto_tree_add_item(data_subtree, hf_hpfeeds_nonce, tvb, offset, -1,
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ENC_NA);
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}
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static void
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dissect_hpfeeds_auth_pdu(tvbuff_t *tvb, proto_tree *tree, guint offset)
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{
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guint8 len = 0;
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len = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_hpfeeds_ident_len, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_hpfeeds_ident, tvb,
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offset, len, ENC_ASCII|ENC_NA);
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offset += len;
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proto_tree_add_item(tree, hf_hpfeeds_secret, tvb,
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offset, -1, ENC_NA);
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}
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static guint8*
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hpfeeds_get_channel_name(tvbuff_t* tvb, guint offset)
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{
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guint8 len = tvb_get_guint8(tvb, offset);
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offset += len + 1;
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len = tvb_get_guint8(tvb, offset);
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offset += 1;
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return tvb_get_string_enc(wmem_file_scope(), tvb, offset, len, ENC_ASCII);
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}
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static guint
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hpfeeds_get_payload_size(tvbuff_t* tvb, guint offset)
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{
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guint message_len = tvb_get_ntohl(tvb, offset);
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guint ident_len = tvb_get_guint8(tvb, offset + 5);
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guint channel_len = tvb_get_guint8(tvb, offset + 6 + ident_len);
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return (message_len - 2 - ident_len - 1 - channel_len);
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}
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static void
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dissect_hpfeeds_publish_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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guint offset)
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{
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guint8 len = 0;
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heur_dtbl_entry_t *hdtbl_entry;
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guint8 *strptr = NULL;
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tvbuff_t *next_tvb;
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len = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_hpfeeds_ident_len, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_hpfeeds_ident, tvb, offset, len, ENC_ASCII|ENC_NA);
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offset += len;
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len = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_hpfeeds_chan_len, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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/* get the channel name as ephemeral string to pass it to the heuristic decoders */
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strptr = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, len, ENC_ASCII);
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proto_tree_add_item(tree, hf_hpfeeds_channel, tvb, offset, len, ENC_ASCII|ENC_NA);
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offset += len;
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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/* try the heuristic dissectors */
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if (try_heuristic) {
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if (dissector_try_heuristic(heur_subdissector_list, next_tvb, pinfo, tree, &hdtbl_entry, strptr)) {
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return;
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}
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}
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/* heuristic failed. Print remaining bytes as flat payload */
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proto_tree_add_item(tree, hf_hpfeeds_payload, tvb, offset, -1, ENC_NA);
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}
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static void hpfeeds_stats_tree_init(stats_tree* st)
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{
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st_node_channels_payload = stats_tree_create_node(st, st_str_channels_payload, 0, TRUE);
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st_node_opcodes = stats_tree_create_pivot(st, st_str_opcodes, 0);
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channels_list = wmem_list_new(wmem_epan_scope());
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}
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static int hpfeeds_stats_tree_packet(stats_tree* st _U_, packet_info* pinfo _U_, epan_dissect_t* edt _U_, const void* p)
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{
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struct HpfeedsTap *pi = (struct HpfeedsTap *)p;
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wmem_list_frame_t* head = wmem_list_head(channels_list);
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wmem_list_frame_t* cur = head;
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struct channel_node* ch_node;
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if (pi->opcode == OP_PUBLISH) {
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/* search an existing channel node and create it if it does not */
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while(cur != NULL) {
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ch_node = (struct channel_node*)wmem_list_frame_data(cur);
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if (strncmp(ch_node->channel, pi->channel, strlen(pi->channel)) == 0) {
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break;
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}
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cur = wmem_list_frame_next(cur);
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}
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if (cur == NULL) {
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ch_node = (struct channel_node*)wmem_alloc0(wmem_file_scope(), sizeof(struct channel_node));
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ch_node->channel = wmem_strdup(wmem_file_scope(), pi->channel);
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ch_node->st_node_channel_payload = stats_tree_create_node(st, ch_node->channel,
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st_node_channels_payload, FALSE);
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wmem_list_append(channels_list, ch_node);
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}
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avg_stat_node_add_value(st, st_str_channels_payload, 0, FALSE, pi->payload_size);
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avg_stat_node_add_value(st, ch_node->channel, 0, FALSE, pi->payload_size);
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}
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stats_tree_tick_pivot(st, st_node_opcodes,
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val_to_str(pi->opcode, opcode_vals, "Unknown opcode (%d)"));
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return 1;
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}
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static void
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dissect_hpfeeds_subscribe_pdu(tvbuff_t *tvb, proto_tree *tree, guint offset)
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{
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guint8 len = 0;
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/* get length of ident field */
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len = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(tree, hf_hpfeeds_ident_len, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_hpfeeds_ident, tvb, offset, len,
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ENC_ASCII|ENC_NA);
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/* move forward inside data */
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offset += len;
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proto_tree_add_item(tree, hf_hpfeeds_channel, tvb, offset, -1,
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ENC_ASCII|ENC_NA);
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}
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/*
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* Get the length of the HPFEED message, including header
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* This is a trivial function, but it's mandatory as it is used as a callback
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* by the routine to re-assemble the protocol spread on multiple TCP packets
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*/
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static guint
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get_hpfeeds_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
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{
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return tvb_get_ntohl(tvb, offset + 0);
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}
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static int
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dissect_hpfeeds_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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struct HpfeedsTap *hpfeeds_stats;
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/* We have already parsed msg length we need to skip to opcode offset */
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guint offset = 0;
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guint8 opcode;
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proto_item *ti;
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proto_tree *hpfeeds_tree, *data_subtree;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "HPFEEDS");
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ti = proto_tree_add_item(tree, proto_hpfeeds, tvb, 0, -1, ENC_NA);
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hpfeeds_tree = proto_item_add_subtree(ti, ett_hpfeeds);
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proto_tree_add_item(hpfeeds_tree, hf_hpfeeds_msg_length, tvb, offset,
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4, ENC_BIG_ENDIAN);
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offset += 4;
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/* Get opcode and write it */
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opcode = tvb_get_guint8(tvb, offset);
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/* Clear out stuff in the info column */
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col_add_fstr(pinfo->cinfo, COL_INFO, "Type %s",
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val_to_str(opcode, opcode_vals, "Unknown (0x%02x)"));
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ti = proto_tree_add_item(hpfeeds_tree, hf_hpfeeds_opcode, tvb, offset,
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1, ENC_BIG_ENDIAN);
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data_subtree = proto_item_add_subtree(ti, ett_hpfeeds);
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offset += 1;
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if (opcode >= array_length(opcode_vals) - 1) {
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expert_add_info_format(pinfo, ti, &ei_hpfeeds_opcode_unknown,
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"Unknown value %02x for opcode field", opcode);
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}
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if (tree) { /* we are being asked for details */
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switch (opcode) {
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case OP_ERROR:
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dissect_hpfeeds_error_pdu(tvb, data_subtree, offset);
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break;
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case OP_INFO:
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dissect_hpfeeds_info_pdu(tvb, data_subtree, offset);
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break;
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case OP_AUTH:
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dissect_hpfeeds_auth_pdu(tvb, data_subtree, offset);
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break;
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case OP_PUBLISH:
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dissect_hpfeeds_publish_pdu(tvb, pinfo, data_subtree, offset);
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break;
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case OP_SUBSCRIBE:
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dissect_hpfeeds_subscribe_pdu(tvb, data_subtree, offset);
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break;
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/* No need for a default, we check that outside the if(tree)
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* block earlier */
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}
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}
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/* In publish, generate stats every packet, even not in tree */
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hpfeeds_stats = wmem_new0(wmem_file_scope(), struct HpfeedsTap);
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if (opcode == OP_PUBLISH) {
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hpfeeds_stats->channel = hpfeeds_get_channel_name(tvb, offset);
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hpfeeds_stats->payload_size = hpfeeds_get_payload_size(tvb, 0);
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}
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hpfeeds_stats->opcode = opcode;
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tap_queue_packet(hpfeeds_tap, pinfo, hpfeeds_stats);
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return tvb_captured_length(tvb);
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}
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static int
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dissect_hpfeeds(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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/* At lease header is needed */
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if (tvb_reported_length(tvb) < HPFEEDS_HDR_LEN)
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return 0;
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tcp_dissect_pdus(tvb, pinfo, tree, hpfeeds_desegment, HPFEEDS_HDR_LEN,
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get_hpfeeds_pdu_len, dissect_hpfeeds_pdu, data);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_hpfeeds(void)
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{
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static hf_register_info hf[] = {
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{ &hf_hpfeeds_opcode,
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{ "Opcode", "hpfeeds.opcode",
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FT_UINT8, BASE_DEC_HEX,
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VALS(opcode_vals), 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_msg_length,
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{ "Message Length", "hpfeeds.msglen",
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FT_UINT32, BASE_DEC_HEX,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_nonce,
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{ "Nonce", "hpfeeds.nonce",
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FT_BYTES, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_secret,
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{ "Secret", "hpfeeds.secret",
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FT_BYTES, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_payload,
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{ "Payload", "hpfeeds.payload",
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FT_BYTES, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_server,
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{ "Server", "hpfeeds.server",
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FT_STRING, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_ident,
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{ "Ident", "hpfeeds.ident",
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FT_STRING, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_channel,
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{ "Channel", "hpfeeds.channel",
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FT_STRING, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_chan_len,
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{ "Channel length", "hpfeeds.channel_len",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_ident_len,
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{ "Ident length", "hpfeeds.ident_len",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_errmsg,
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{ "Error message", "hpfeeds.errmsg",
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FT_STRING, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_hpfeeds_server_len,
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{ "Server length", "hpfeeds.server_len",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_hpfeeds
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};
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static ei_register_info ei[] = {
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|
{ &ei_hpfeeds_opcode_unknown, { "hpfeeds.opcode.unknown", PI_PROTOCOL, PI_WARN, "Unknown value for opcode field", EXPFILL }},
|
|
};
|
|
|
|
module_t *hpfeeds_module;
|
|
expert_module_t* expert_hpfeeds;
|
|
|
|
proto_hpfeeds = proto_register_protocol (
|
|
"HPFEEDS HoneyPot Feeds Protocol", /* name */
|
|
"HPFEEDS", /* short name */
|
|
"hpfeeds" /* abbrev */
|
|
);
|
|
|
|
heur_subdissector_list = register_heur_dissector_list("hpfeeds");
|
|
|
|
proto_register_field_array(proto_hpfeeds, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_hpfeeds = expert_register_protocol(proto_hpfeeds);
|
|
expert_register_field_array(expert_hpfeeds, ei, array_length(ei));
|
|
|
|
hpfeeds_module = prefs_register_protocol(proto_hpfeeds, proto_reg_handoff_hpfeeds);
|
|
prefs_register_bool_preference(hpfeeds_module, "desegment_hpfeeds_messages",
|
|
"Reassemble HPFEEDS messages spanning multiple TCP segments",
|
|
"Whether the HPFEEDS dissector should reassemble messages spanning "
|
|
"multiple TCP segments. "
|
|
"To use this option, you must also enable \"Allow subdissectors to "
|
|
"reassemble TCP streams\" in the TCP protocol settings.",
|
|
&hpfeeds_desegment);
|
|
|
|
prefs_register_uint_preference(hpfeeds_module,
|
|
"dissector_port",
|
|
"Dissector TCP port",
|
|
"Set the TCP port for HPFEEDS messages",
|
|
10, &hpfeeds_port_pref);
|
|
|
|
prefs_register_bool_preference(hpfeeds_module, "try_heuristic",
|
|
"Try heuristic sub-dissectors",
|
|
"Try to decode the payload using an heuristic sub-dissector",
|
|
&try_heuristic);
|
|
|
|
hpfeeds_tap = register_tap("hpfeeds");
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_hpfeeds(void)
|
|
{
|
|
static dissector_handle_t hpfeeds_handle;
|
|
static gboolean hpfeeds_prefs_initialized = FALSE;
|
|
static gint16 hpfeeds_dissector_port;
|
|
|
|
if (!hpfeeds_prefs_initialized) {
|
|
hpfeeds_handle = new_create_dissector_handle(dissect_hpfeeds, proto_hpfeeds);
|
|
stats_tree_register("hpfeeds", "hpfeeds", "HPFEEDS", 0, hpfeeds_stats_tree_packet, hpfeeds_stats_tree_init, NULL);
|
|
hpfeeds_prefs_initialized = TRUE;
|
|
}
|
|
else {
|
|
dissector_delete_uint("tcp.port",hpfeeds_dissector_port , hpfeeds_handle);
|
|
}
|
|
|
|
hpfeeds_dissector_port = hpfeeds_port_pref;
|
|
|
|
dissector_add_uint("tcp.port", hpfeeds_dissector_port, hpfeeds_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://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:
|
|
*/
|