![Bill Meier](/assets/img/avatar_default.png)
For: - FT_BYTES: Always use just ENC_NA - integral/floating (other than FT_[U]INT8): Do ENC_NA --> ENC_BIG_ENDIAN Also: - FT_UINT... --> FT_UINT8 in a few cases (to match proto_tree_add_item...) - Change one case of incorrect '||' to '|' Change-Id: I427e0e61618ff8faf55691c8a695930f67d455b0 Reviewed-on: https://code.wireshark.org/review/4184 Reviewed-by: Bill Meier <wmeier@newsguy.com>
638 lines
21 KiB
C
638 lines
21 KiB
C
/* packet-soupbintcp.c
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* Routines for SoupBinTCP 3.0 protocol dissection
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* Copyright 2013 David Arnold <davida@pobox.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
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*/
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/*
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* SoupBinTCP is a framing protocol published and used by NASDAQ to
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* encapsulate both market data (ITCH) and order entry (OUCH)
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* protocols. It is derived from the original SOUP protocol, which
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* was ASCII-based, and relied on an EOL indicator as a message
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* boundary.
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*
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* SoupBinTCP was introduced with OUCH-4.0 / ITCH-4.0 when those
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* protocols also switched to using a binary representation for
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* numerical values.
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*
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* The SOUP/SoupBinTCP protocols are also commonly used by other
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* financial exchanges, although frequently they are more SOUP-like
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* than exactly the same. This dissector doesn't attempt to support
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* any other SOUP-like variants; I think it's probably better to have
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* separate (if similar) dissectors for them.
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*
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* The only really complexity in the protocol is the message sequence
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* numbering. See the comments below for an explanation of how it is
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* handled.
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*
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* Specifications are available from NASDAQ's website, although the
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* links to find them tend to move around over time. At the time of
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* writing the correct URL is:
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*
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* http://www.nasdaqtrader.com/content/technicalsupport/specifications/dataproducts/soupbintcp.pdf
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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 <epan/conversation.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/wmem/wmem.h>
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/* For tcp_dissect_pdus() */
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#include "packet-tcp.h"
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void proto_register_soupbintcp(void);
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void proto_reg_handoff_soupbintcp(void);
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/** Session data stored in the conversation */
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struct conv_data {
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/** Next expected sequence number
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*
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* Set by the Login Accepted packet, and then updated for each
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* subsequent Sequenced Data packet during dissection. */
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guint next_seq;
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};
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/** Per-PDU data, stored in the frame's private data pointer */
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struct pdu_data {
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/** Sequence number for this PDU */
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guint seq_num;
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};
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/** Packet names, indexed by message type code value */
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static const value_string pkt_type_val[] = {
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{ '+', "Debug Packet" },
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{ 'A', "Login Accepted" },
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{ 'H', "Server Heartbeat" },
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{ 'J', "Login Rejected" },
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{ 'L', "Login Request" },
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{ 'O', "Logout Request" },
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{ 'R', "Client Heartbeat" },
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{ 'S', "Sequenced Data" },
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{ 'U', "Unsequenced Data" },
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{ 'Z', "End of Session" },
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{ 0, NULL }
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};
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/** Login reject reasons, indexed by code value */
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static const value_string reject_code_val[] = {
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{ 'A', "Not authorized" },
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{ 'S', "Session not available" },
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{ 0, NULL }
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};
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/* Initialize the protocol and registered fields */
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static int proto_soupbintcp = -1;
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static dissector_handle_t soupbintcp_handle;
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static heur_dissector_list_t heur_subdissector_list;
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/* Preferences */
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static gboolean soupbintcp_desegment = TRUE;
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static range_t *global_soupbintcp_range = NULL;
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static range_t *soupbintcp_range = NULL;
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/* Initialize the subtree pointers */
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static gint ett_soupbintcp = -1;
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/* Header field formatting */
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static int hf_soupbintcp_packet_length = -1;
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static int hf_soupbintcp_packet_type = -1;
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static int hf_soupbintcp_message = -1;
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static int hf_soupbintcp_text = -1;
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static int hf_soupbintcp_username = -1;
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static int hf_soupbintcp_password = -1;
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static int hf_soupbintcp_session = -1;
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static int hf_soupbintcp_seq_num = -1;
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static int hf_soupbintcp_next_seq_num = -1;
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static int hf_soupbintcp_req_seq_num = -1;
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static int hf_soupbintcp_reject_code = -1;
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/** Format the display of the packet type code
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*
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* This function is called via BASE_CUSTOM, and displays the packet
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* type code as a character like it is in the specification, rather
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* than using BASE_DEC which shows it as an integer value. */
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static void
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format_packet_type(
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gchar *buf,
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guint32 value)
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{
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g_snprintf(buf, ITEM_LABEL_LENGTH,
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"%s (%c)",
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val_to_str(value, pkt_type_val, "Unknown packet"),
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(char)(value & 0xff));
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}
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/** Format the display of the login rejection reason code
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*
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* This function is called via BASE_CUSTOM, and displays the login
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* rejection reason code as a character like it is in the
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* specification, rather than using BASE_DEC which show it as an
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* integer value. */
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static void
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format_reject_code(
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gchar *buf,
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guint32 value)
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{
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g_snprintf(buf, ITEM_LABEL_LENGTH,
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"%s (%c)",
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val_to_str(value, reject_code_val, "Unknown reject code"),
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(char)(value & 0xff));
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}
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/** Dissector for SoupBinTCP messages */
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static void
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dissect_soupbintcp_common(
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tvbuff_t *tvb,
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packet_info *pinfo,
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proto_tree *tree)
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{
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struct conv_data *conv_data;
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struct pdu_data *pdu_data;
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const char *pkt_name;
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const char *tmp_buf;
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proto_item *ti;
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proto_tree *soupbintcp_tree = NULL;
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conversation_t *conv = NULL;
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guint16 expected_len;
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guint8 pkt_type;
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gint offset = 0;
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guint this_seq = 0, next_seq;
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heur_dtbl_entry_t *hdtbl_entry;
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/* Get the 16-bit big-endian SOUP packet length */
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expected_len = tvb_get_ntohs(tvb, 0);
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/* Get the 1-byte SOUP message type */
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pkt_type = tvb_get_guint8(tvb, 2);
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/* Since we use the packet name a few times, get and save that value */
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pkt_name = val_to_str(pkt_type, pkt_type_val, "Unknown (%u)");
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/* Set the protocol name in the summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SoupBinTCP");
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/* Set the packet name in the info column */
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col_add_str(pinfo->cinfo, COL_INFO, pkt_name);
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/* Sequence number tracking
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*
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* SOUP does not number packets from client to server (the server
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* acknowledges all important messages, so the client should use
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* the acks to figure out if the server received the message, and
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* otherwise resend it).
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*
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* Packets from server to client are numbered, but it's implicit.
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* The Login Accept packet contains the next sequence number that
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* the server will send, and the client needs to count the
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* Sequenced Data packets that it receives to know what their
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* sequence numbers are.
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*
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* So, we grab the next sequence number from the Login Acceptance
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* packet, and save it in a conversation_t we associate with the
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* TCP session. Then, for each Sequenced Data packet we receive,
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* the first time it's processed (when PINFO_FD_VISITED() is
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* false), we write it into the PDU's frame's private data pointer
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* and increment the saved sequence number (in the conversation_t).
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*
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* If the visited flag is true, then we've dissected this packet
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* already, and so we can fetch the sequence number from the
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* frame's private data area.
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*
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* In either case, if there's any problem, we report zero as the
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* sequence number, and try to continue dissecting. */
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/* If first dissection of Login Accept, save sequence number */
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if (pkt_type == 'A' && !PINFO_FD_VISITED(pinfo)) {
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tmp_buf = tvb_get_string_enc(wmem_packet_scope(), tvb, 13, 20, ENC_ASCII);
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next_seq = atoi(tmp_buf);
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/* Create new conversation for this session */
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conv = conversation_new(PINFO_FD_NUM(pinfo),
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&pinfo->src,
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&pinfo->dst,
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pinfo->ptype,
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pinfo->srcport,
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pinfo->destport,
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0);
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/* Store starting sequence number for session's packets */
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conv_data = (struct conv_data *)wmem_alloc(wmem_file_scope(), sizeof(struct conv_data));
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conv_data->next_seq = next_seq;
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conversation_add_proto_data(conv, proto_soupbintcp, conv_data);
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}
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/* Handle sequence numbering for a Sequenced Data packet */
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if (pkt_type == 'S') {
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if (!PINFO_FD_VISITED(pinfo)) {
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/* Get next expected sequence number from conversation */
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conv = find_conversation(PINFO_FD_NUM(pinfo),
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&pinfo->src,
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&pinfo->dst,
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pinfo->ptype,
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pinfo->srcport,
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pinfo->destport,
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0);
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if (!conv) {
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this_seq = 0;
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} else {
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conv_data = (struct conv_data *)conversation_get_proto_data(conv,
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proto_soupbintcp);
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if (conv_data) {
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this_seq = conv_data->next_seq++;
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} else {
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this_seq = 0;
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}
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pdu_data = (struct pdu_data *)wmem_alloc(
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wmem_file_scope(),
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sizeof(struct pdu_data));
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pdu_data->seq_num = this_seq;
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p_add_proto_data(wmem_file_scope(), pinfo, proto_soupbintcp, 0, pdu_data);
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}
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} else {
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pdu_data = (struct pdu_data *)p_get_proto_data(wmem_file_scope(), pinfo, proto_soupbintcp, 0);
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if (pdu_data) {
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this_seq = pdu_data->seq_num;
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} else {
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this_seq = 0;
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}
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}
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col_append_fstr(pinfo->cinfo, COL_INFO, ", SeqNum = %u", this_seq);
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}
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if (tree) {
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/* Create sub-tree for SoupBinTCP details */
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ti = proto_tree_add_item(tree,
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proto_soupbintcp,
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tvb, 0, -1, ENC_NA);
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soupbintcp_tree = proto_item_add_subtree(ti, ett_soupbintcp);
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/* Append the packet name to the sub-tree item */
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proto_item_append_text(ti, ", %s", pkt_name);
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/* Length */
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_packet_length,
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tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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/* Type */
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_packet_type,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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switch (pkt_type) {
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case '+': /* Debug Message */
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_text,
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tvb, offset, expected_len - 1, ENC_ASCII|ENC_NA);
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break;
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case 'A': /* Login Accept */
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_session,
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tvb, offset, 10, ENC_ASCII|ENC_NA);
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offset += 10;
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tmp_buf = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, 20, ENC_ASCII);
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proto_tree_add_string_format_value(soupbintcp_tree,
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hf_soupbintcp_next_seq_num,
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tvb, offset, 20,
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"X", "%d", atoi(tmp_buf));
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break;
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case 'J': /* Login Reject */
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_reject_code,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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break;
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case 'U': /* Unsequenced Data */
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/* Display handled by sub-dissector */
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break;
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case 'S': /* Sequenced Data */
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proto_item_append_text(ti, ", SeqNum=%u", this_seq);
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proto_tree_add_string_format_value(soupbintcp_tree,
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hf_soupbintcp_seq_num,
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tvb, offset, 0,
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"X",
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"%u (Calculated)",
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this_seq);
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/* Display handled by sub-dissector */
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break;
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case 'L': /* Login Request */
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_username,
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tvb, offset, 6, ENC_ASCII|ENC_NA);
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offset += 6;
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_password,
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tvb, offset, 10, ENC_ASCII|ENC_NA);
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offset += 10;
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_session,
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tvb, offset, 10, ENC_ASCII|ENC_NA);
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offset += 10;
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tmp_buf = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, 20, ENC_ASCII);
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proto_tree_add_string_format_value(soupbintcp_tree,
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hf_soupbintcp_req_seq_num,
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tvb, offset, 20,
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"X", "%d", atoi(tmp_buf));
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break;
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case 'H': /* Server Heartbeat */
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break;
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case 'O': /* Logout Request */
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break;
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case 'R': /* Client Heartbeat */
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break;
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case 'Z': /* End of Session */
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break;
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default:
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/* Unknown */
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proto_tree_add_item(tree,
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hf_soupbintcp_message,
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tvb, offset, -1, ENC_NA);
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break;
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}
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}
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/* Call sub-dissector for encapsulated data */
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if (pkt_type == 'S' || pkt_type == 'U') {
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tvbuff_t *sub_tvb;
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/* Sub-dissector tvb starts at 3 (length (2) + pkt_type (1)) */
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sub_tvb = tvb_new_subset_remaining(tvb, 3);
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#if 0 /* XXX: It's not valid for a soupbintcp subdissector to call */
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/* conversation_set_dissector() since the conversation is really */
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/* a TCP conversation. (A 'soupbintcp' port type would need to */
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/* be defined to be able to use conversation_set_dissector()). */
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/* In addition, no current soupbintcp subdissector calls */
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/* conversation_set_dissector(). */
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/* If this packet is part of a conversation, call dissector
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* for the conversation if available */
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if (try_conversation_dissector(&pinfo->dst, &pinfo->src, pinfo->ptype,
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pinfo->srcport, pinfo->destport,
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sub_tvb, pinfo, tree, NULL)) {
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return;
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}
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#endif
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/* Otherwise, try heuristic dissectors */
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if (dissector_try_heuristic(heur_subdissector_list,
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sub_tvb,
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pinfo,
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tree,
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&hdtbl_entry,
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NULL)) {
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return;
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}
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/* Otherwise, give up, and just print the bytes in hex */
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if (tree) {
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proto_tree_add_item(soupbintcp_tree,
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hf_soupbintcp_message,
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sub_tvb, 0, -1,
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ENC_NA);
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}
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}
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}
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/** Return the size of the PDU in @p tvb, starting at @p offset */
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static guint
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get_soupbintcp_pdu_len(
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packet_info *pinfo _U_,
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tvbuff_t *tvb,
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int offset)
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{
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/* Determine the length of the PDU using the SOUP header's 16-bit
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big-endian length (at offset zero). We're guaranteed to get at
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least two bytes here because we told tcp_dissect_pdus() that we
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needed them. Add 2 to the retrieved value, because the SOUP
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length doesn't include the length field itself. */
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return (guint)tvb_get_ntohs(tvb, offset) + 2;
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}
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/** Dissect a possibly-reassembled TCP PDU */
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static int
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dissect_soupbintcp_tcp_pdu(
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tvbuff_t *tvb,
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packet_info *pinfo,
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proto_tree *tree,
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void *data _U_)
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{
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dissect_soupbintcp_common(tvb, pinfo, tree);
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return tvb_length(tvb);
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}
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/** Dissect a TCP segment containing SoupBinTCP data */
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static int
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dissect_soupbintcp_tcp(
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tvbuff_t *tvb,
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packet_info *pinfo,
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proto_tree *tree,
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void *data)
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{
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tcp_dissect_pdus(tvb, pinfo, tree,
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soupbintcp_desegment, 2,
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get_soupbintcp_pdu_len,
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dissect_soupbintcp_tcp_pdu, data);
|
|
return tvb_length(tvb);
|
|
}
|
|
|
|
static void
|
|
soupbintcp_prefs(void)
|
|
{
|
|
dissector_delete_uint_range("tcp.port", soupbintcp_range, soupbintcp_handle);
|
|
g_free(soupbintcp_range);
|
|
soupbintcp_range = range_copy(global_soupbintcp_range);
|
|
dissector_add_uint_range("tcp.port", soupbintcp_range, soupbintcp_handle);
|
|
}
|
|
|
|
|
|
void
|
|
proto_register_soupbintcp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
|
|
{ &hf_soupbintcp_packet_length,
|
|
{ "Packet Length", "soupbintcp.packet_length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Packet length, in bytes, NOT including these two bytes.",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_packet_type,
|
|
{ "Packet Type", "soupbintcp.packet_type",
|
|
FT_UINT8, BASE_CUSTOM, format_packet_type, 0x0,
|
|
"Message type code",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_reject_code,
|
|
{ "Login Reject Code", "soupbintcp.reject_code",
|
|
FT_UINT8, BASE_CUSTOM, format_reject_code, 0x0,
|
|
"Login reject reason code",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_message,
|
|
{ "Message", "soupbintcp.message",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"Content of SoupBinTCP frame",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_text,
|
|
{ "Debug Text", "soupbintcp.text",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"Free-form, human-readable text",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_username,
|
|
{ "User Name", "soupbintcp.username",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"User's login name",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_password,
|
|
{ "Password", "soupbintcp.password",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"User's login password",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_session,
|
|
{ "Session", "soupbintcp.session",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"Session identifier, or send all spaces to log into the currently "
|
|
"active session",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_seq_num,
|
|
{ "Sequence number", "soupbintcp.seq_num",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"Calculated sequence number for this message",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_next_seq_num,
|
|
{ "Next sequence number", "soupbintcp.next_seq_num",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"Sequence number of next Sequenced Data message to be delivered",
|
|
HFILL }},
|
|
|
|
{ &hf_soupbintcp_req_seq_num,
|
|
{ "Requested sequence number", "soupbintcp.req_seq_num",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"Request to begin (re)transmission of Sequenced Data at this "
|
|
"sequence number, or, if zero, to begin transmission with the "
|
|
"next message generated",
|
|
HFILL }}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_soupbintcp
|
|
};
|
|
|
|
module_t *soupbintcp_module;
|
|
|
|
proto_soupbintcp
|
|
= proto_register_protocol("SoupBinTCP", "SoupBinTCP", "soupbintcp");
|
|
|
|
proto_register_field_array(proto_soupbintcp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
soupbintcp_module
|
|
= prefs_register_protocol(proto_soupbintcp,
|
|
soupbintcp_prefs);
|
|
|
|
prefs_register_bool_preference(
|
|
soupbintcp_module,
|
|
"desegment",
|
|
"Reassemble SoupBinTCP messages spanning multiple TCP segments",
|
|
"Whether the SoupBinTCP dissector should reassemble messages "
|
|
"spanning multiple TCP segments.",
|
|
&soupbintcp_desegment);
|
|
|
|
prefs_register_range_preference(
|
|
soupbintcp_module,
|
|
"tcp.port",
|
|
"TCP Ports",
|
|
"TCP Ports range",
|
|
&global_soupbintcp_range,
|
|
65535);
|
|
|
|
soupbintcp_range = range_empty();
|
|
|
|
register_heur_dissector_list("soupbintcp", &heur_subdissector_list);
|
|
}
|
|
|
|
|
|
void
|
|
proto_reg_handoff_soupbintcp(void)
|
|
{
|
|
soupbintcp_handle = new_create_dissector_handle(dissect_soupbintcp_tcp,
|
|
proto_soupbintcp);
|
|
|
|
/* For "decode-as" */
|
|
dissector_add_for_decode_as("tcp.port", soupbintcp_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:
|
|
*/
|