forked from osmocom/wireshark
488 lines
20 KiB
C
488 lines
20 KiB
C
/* conversation.h
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* Routines for building lists of packets that are part of a "conversation"
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef __CONVERSATION_H__
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#define __CONVERSATION_H__
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#include "ws_symbol_export.h"
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#include "packet.h" /* for conversation dissector type */
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#include <epan/wmem_scopes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* @file
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* The conversation API lets you correlate packets based on values in a
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* packet, typically address+port tuples. You can search for conversations
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* based on their value tuples and attach data to them.
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*/
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/**
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* Flags to pass to "conversation_new()" to indicate that the address 2
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* and/or port 2 values for the conversation should be wildcards.
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* The CONVERSATION_TEMPLATE option tells that any of the other supplied
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* port and / or address wildcards will be used to match an infinite number
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* of new connections to the conversation(s) that have the CONVERSATION_-
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* TEMPLATE flag set. Any conversation created without the CONVERSATION_-
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* TEMPLATE flag will be altered once the first connections (connection
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* oriented protocols only) to include the newly found information which
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* matched the wildcard options.
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*/
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#define NO_ADDR2 0x01
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#define NO_PORT2 0x02
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#define NO_PORT2_FORCE 0x04
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#define CONVERSATION_TEMPLATE 0x08
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/**
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* Flags to pass to "find_conversation()" to indicate that the address B
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* and/or port B search arguments are wildcards.
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*/
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#define NO_MASK_B 0xFFFF0000
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#define NO_ADDR_B 0x00010000
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#define NO_PORT_B 0x00020000
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/** Flags to handle endpoints */
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#define USE_LAST_ENDPOINT 0x08 /**< Use last endpoint created, regardless of type */
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/* Types of conversations Wireshark knows about. */
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typedef enum {
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CONVERSATION_NONE, /* no conversation key */
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CONVERSATION_SCTP, /* SCTP */
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CONVERSATION_TCP, /* TCP address/port pairs */
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CONVERSATION_UDP, /* UDP address/port pairs */
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CONVERSATION_DCCP, /* DCCP */
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CONVERSATION_IPX, /* IPX sockets */
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CONVERSATION_NCP, /* NCP connection */
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CONVERSATION_EXCHG, /* Fibre Channel exchange */
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CONVERSATION_DDP, /* DDP AppleTalk address/port pair */
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CONVERSATION_SBCCS, /* FICON */
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CONVERSATION_IDP, /* XNS IDP sockets */
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CONVERSATION_TIPC, /* TIPC PORT */
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CONVERSATION_USB, /* USB endpoint 0xffff means the host */
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CONVERSATION_I2C,
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CONVERSATION_IBQP, /* Infiniband QP number */
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CONVERSATION_BLUETOOTH,
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CONVERSATION_TDMOP,
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CONVERSATION_DVBCI,
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CONVERSATION_ISO14443,
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CONVERSATION_ISDN, /* ISDN channel number */
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CONVERSATION_H223, /* H.223 logical channel number */
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CONVERSATION_X25, /* X.25 logical channel number */
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CONVERSATION_IAX2, /* IAX2 call id */
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CONVERSATION_DLCI, /* Frame Relay DLCI */
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CONVERSATION_ISUP, /* ISDN User Part CIC */
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CONVERSATION_BICC, /* BICC Circuit identifier */
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CONVERSATION_GSMTAP,
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CONVERSATION_IUUP,
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CONVERSATION_DVBBBF, /* DVB Base Band Frame ISI/PLP_ID */
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CONVERSATION_IWARP_MPA, /* iWarp MPA */
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CONVERSATION_BT_UTP, /* BitTorrent uTP Connection ID */
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CONVERSATION_LOG, /* Logging source */
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} conversation_type;
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/*
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* XXX - for now, we just #define these to be the same as the
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* corresponding CONVERSATION_ values, for backwards source
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* compatibility.
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*
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* In the long term, we should make this into a separate enum,
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* with elements corresponding to conversation types that do
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* not have known endpoints removed.
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*/
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/* Types of conversation endpoints Wireshark knows about. */
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#define ENDPOINT_NONE CONVERSATION_NONE
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#define ENDPOINT_SCTP CONVERSATION_SCTP
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#define ENDPOINT_TCP CONVERSATION_TCP
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#define ENDPOINT_UDP CONVERSATION_UDP
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#define ENDPOINT_DCCP CONVERSATION_DCCP
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#define ENDPOINT_IPX CONVERSATION_IPX
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#define ENDPOINT_NCP CONVERSATION_NCP
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#define ENDPOINT_EXCHG CONVERSATION_EXCHG
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#define ENDPOINT_DDP CONVERSATION_DDP
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#define ENDPOINT_SBCCS CONVERSATION_SBCCS
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#define ENDPOINT_IDP CONVERSATION_IDP
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#define ENDPOINT_TIPC CONVERSATION_TIPC
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#define ENDPOINT_USB CONVERSATION_USB
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#define ENDPOINT_I2C CONVERSATION_I2C
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#define ENDPOINT_IBQP CONVERSATION_IBQP
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#define ENDPOINT_BLUETOOTH CONVERSATION_BLUETOOTH
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#define ENDPOINT_TDMOP CONVERSATION_TDMOP
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#define ENDPOINT_DVBCI CONVERSATION_DVBCI
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#define ENDPOINT_ISO14443 CONVERSATION_ISO14443
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#define ENDPOINT_ISDN CONVERSATION_ISDN
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#define ENDPOINT_H223 CONVERSATION_H223
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#define ENDPOINT_X25 CONVERSATION_X25
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#define ENDPOINT_IAX2 CONVERSATION_IAX2
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#define ENDPOINT_DLCI CONVERSATION_DLCI
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#define ENDPOINT_ISUP CONVERSATION_ISUP
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#define ENDPOINT_BICC CONVERSATION_BICC
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#define ENDPOINT_GSMTAP CONVERSATION_GSMTAP
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#define ENDPOINT_IUUP CONVERSATION_IUUP
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#define ENDPOINT_DVBBBF CONVERSATION_DVBBBF
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#define ENDPOINT_IWARP_MPA CONVERSATION_IWARP_MPA
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#define ENDPOINT_BT_UTP CONVERSATION_BT_UTP
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#define ENDPOINT_LOG CONVERSATION_LOG
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typedef conversation_type endpoint_type;
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/**
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* Conversation element type.
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*/
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typedef enum {
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CE_CONVERSATION_TYPE, /* CONVERSATION_ value */
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CE_ADDRESS, /* address */
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CE_PORT, /* unsigned integer representing a port */
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CE_STRING, /* string */
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CE_UINT, /* unsigned integer not representing a port */
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CE_UINT64, /* 64-bit unsigned integer */
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} conversation_element_type;
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/**
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* Elements used to identify conversations for *_full routines and
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* pinfo->conv_elements.
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* Arrays must be terminated with an element .type set to CE_CONVERSATION_TYPE.
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*
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* This is currently set only by conversation_set_elements_by_id(); it
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* is not set for conversations identified by address/port endpoints.
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*
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* In find_conversation_pinfo() and find_or_create_conversation(), if
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* any dissector has set this, then, unless some dissector has set the
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* pair of address/port endpoints (see below), the array of elements
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* is used to look up or create the conversation. Otherwise, the
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* current addresses and ports in the packet_info structure are used.
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*
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* XXX - is there any reason why we shouldn't use an array of conversation
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* elements, with the appropriate addresses and ports, and set it for
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* all protocols that use conversations specified by a pair of address/port
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* endpoints? That might simplify find_conversation_pinfo() by having
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* them always use the array of elements if it's present, and just fail if
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* it's not.
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*/
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typedef struct conversation_element {
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conversation_element_type type;
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union {
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conversation_type conversation_type_val;
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address addr_val;
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unsigned int port_val;
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const char *str_val;
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unsigned int uint_val;
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uint64_t uint64_val;
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};
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} conversation_element_t;
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/**
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* Data structure representing a conversation.
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*/
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typedef struct conversation {
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struct conversation *next; /** pointer to next conversation on hash chain */
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struct conversation *last; /** pointer to the last conversation on hash chain */
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struct conversation *latest_found; /** pointer to the last conversation on hash chain */
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guint32 conv_index; /** unique ID for conversation */
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guint32 setup_frame; /** frame number that setup this conversation */
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/* Assume that setup_frame is also the lowest frame number for now. */
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guint32 last_frame; /** highest frame number in this conversation */
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wmem_tree_t *data_list; /** list of data associated with conversation */
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wmem_tree_t *dissector_tree; /** tree containing protocol dissector client associated with conversation */
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guint options; /** wildcard flags */
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conversation_element_t *key_ptr; /** Keys are conversation element arrays terminated with a CE_CONVERSATION_TYPE */
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} conversation_t;
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/*
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* For some protocols, we store, in the packet_info structure, a pair
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* of address/port endpoints, for use by code that might want to
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* construct a conversation for that protocol.
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*
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* This appears to have been done in order to allow protocols to save
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* that information *without* overwriting the addresses or ports in the
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* packet_info structure, so that the other code that uses those values,
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* such as the code that fills in the address and port columns in the
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* packet summary, will pick up the values put there by protocols such
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* as IP and UDP, rather than the values put there by protocols such as
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* TDMoP, FCIP, TIPC, and DVB Dynamic Mode Adaptation. See commit
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* 66b441f3d63e21949530d672bf1406dea94ed254 and issue #11340.
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*
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* That is set by conversation_set_conv_addr_port_endpoints().
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*
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* In find_conversation_pinfo() and find_or_create_conversation(), if
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* any dissector has set this, that address/port endpoint pair is used
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* to look up or create the conversation.
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*
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* Prior to 4.0, conversations identified by a single integer value
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* (such as a circuit ID) were handled by creating a pair of address/port
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* endpoints with null addresses, the first port equal to the integer
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* value, the second port missing, and a port type being an ENDPOINT_
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* type specifying the protocol for the conversation. Now we use an
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* array of elements, with a CE_UINT value for the integer followed
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* by a CE_CONVERSATION_TYPE value specifying the protocol for the
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* converation.
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*
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* XXX - is there any reason why we shouldn't use an array of conversation
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* elements, with the appropriate addresses and ports, instead of this
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* structure? It would at least simplify find_conversation_pinfo() and
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* find_or_create_conversation().
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*/
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struct conversation_addr_port_endpoints;
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typedef struct conversation_addr_port_endpoints* conversation_addr_port_endpoints_t;
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WS_DLL_PUBLIC const address* conversation_key_addr1(const conversation_element_t *key);
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WS_DLL_PUBLIC guint32 conversation_key_port1(const conversation_element_t *key);
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WS_DLL_PUBLIC const address* conversation_key_addr2(const conversation_element_t *key);
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WS_DLL_PUBLIC guint32 conversation_key_port2(const conversation_element_t *key);
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/**
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* Create a new hash tables for conversations.
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*/
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extern void conversation_init(void);
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/**
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* Initialize some variables every time a file is loaded or re-loaded.
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*/
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extern void conversation_epan_reset(void);
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/**
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* Create a new conversation identified by a list of elements.
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* @param setup_frame The first frame in the conversation.
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* @param elements An array of element types and values. Must not be NULL. Must be terminated with a CE_CONVERSATION_TYPE element.
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* @return The new conversation.
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*/
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WS_DLL_PUBLIC WS_RETNONNULL conversation_t *conversation_new_full(const guint32 setup_frame, conversation_element_t *elements);
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/**
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* Given two address/port pairs for a packet, create a new conversation
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* identified by address/port pairs.
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*
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* The options field is used to specify whether the address 2 value
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* and/or port 2 value are not given and any value is acceptable
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* when searching for this conversation. Null address values will
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* be replaced with empty (AT_NONE) addresses.
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*
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* @param setup_frame The first frame in the conversation.
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* @param addr1 The first address in the identifying tuple.
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* @param addr2 The second address in the identifying tuple.
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* @param ctype The conversation type.
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* @param port1 The first port in the identifying tuple.
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* @param port2 The second port in the identifying tuple.
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* @param options NO_ADDR2, NO_PORT2, NO_PORT2_FORCE, or CONVERSATION_TEMPLATE.
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* Options except for NO_PORT2 and NO_PORT2_FORCE can be ORed.
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* @return The new conversation.
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*/
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WS_DLL_PUBLIC WS_RETNONNULL conversation_t *conversation_new(const guint32 setup_frame, const address *addr1, const address *addr2,
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const conversation_type ctype, const guint32 port1, const guint32 port2, const guint options);
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WS_DLL_PUBLIC WS_RETNONNULL conversation_t *conversation_new_by_id(const guint32 setup_frame, const conversation_type ctype, const guint32 id);
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/**
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* Search for a conversation based on the structure and values of an element list.
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* @param frame_num Frame number. Must be greater than or equal to the conversation's initial frame number.
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* @param elements An array of element types and values. Must not be NULL. Must be terminated with a CE_CONVERSATION_TYPE element.
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* @return The matching conversation if found, otherwise NULL.
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*/
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WS_DLL_PUBLIC conversation_t *find_conversation_full(const guint32 frame_num, conversation_element_t *elements);
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/**
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* Given two address/port pairs for a packet, search for a conversation
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* containing packets between those address/port pairs. Returns NULL if
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* not found.
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*
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* We try to find the most exact match that we can, and then proceed to
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* try wildcard matches on the "addr_b" and/or "port_b" argument if a more
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* exact match failed.
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*
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* Either or both of the "addr_b" and "port_b" arguments may be specified as
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* a wildcard by setting the NO_ADDR_B or NO_PORT_B flags in the "options"
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* argument. We do only wildcard matches on addresses and ports specified
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* as wildcards.
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*
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* I.e.:
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*
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* if neither "addr_b" nor "port_b" were specified as wildcards, we
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* do an exact match (addr_a/port_a and addr_b/port_b) and, if that
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* succeeds, we return a pointer to the matched conversation;
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*
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* otherwise, if "port_b" wasn't specified as a wildcard, we try to
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* match any address 2 with the specified port 2 (addr_a/port_a and
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* {any}/addr_b) and, if that succeeds, we return a pointer to the
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* matched conversation;
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*
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* otherwise, if "addr_b" wasn't specified as a wildcard, we try to
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* match any port 2 with the specified address 2 (addr_a/port_a and
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* addr_b/{any}) and, if that succeeds, we return a pointer to the
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* matched conversation;
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*
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* otherwise, we try to match any address 2 and any port 2
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* (addr_a/port_a and {any}/{any}) and, if that succeeds, we return
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* a pointer to the matched conversation;
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*
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* otherwise, we found no matching conversation, and return NULL.
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*
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* Null address values will be replaced with empty (AT_NONE) addresses.
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*
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* @param frame_num Frame number. Must be greater than or equal to the conversation's initial frame number.
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* @param addr_a The first address in the identifying tuple.
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* @param addr_b The second address in the identifying tuple.
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* @param ctype The conversation type.
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* @param port_a The first port in the identifying tuple.
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* @param port_b The second port in the identifying tuple.
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* @param options Wildcard options as described above.
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* @return The matching conversation if found, otherwise NULL.
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*/
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WS_DLL_PUBLIC conversation_t *find_conversation(const guint32 frame_num, const address *addr_a, const address *addr_b,
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const conversation_type ctype, const guint32 port_a, const guint32 port_b, const guint options);
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WS_DLL_PUBLIC conversation_t *find_conversation_by_id(const guint32 frame, const conversation_type ctype, const guint32 id);
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/** A helper function that calls find_conversation() using data from pinfo
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* The frame number and addresses are taken from pinfo.
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*/
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WS_DLL_PUBLIC conversation_t *find_conversation_pinfo(packet_info *pinfo, const guint options);
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/**
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* A helper function that calls find_conversation() and, if a conversation is
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* not found, calls conversation_new().
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* The frame number and addresses are taken from pinfo.
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* No options are used, though we could extend this API to include an options
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* parameter.
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*
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* @param pinfo Packet info.
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* @return The existing or new conversation.
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*/
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WS_DLL_PUBLIC WS_RETNONNULL conversation_t *find_or_create_conversation(packet_info *pinfo);
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/** A helper function that calls find_conversation_by_id() and, if a
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* conversation is not found, calls conversation_new_by_id().
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* The frame number is taken from pinfo.
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*/
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WS_DLL_PUBLIC WS_RETNONNULL conversation_t *find_or_create_conversation_by_id(packet_info *pinfo, const conversation_type ctype, const guint32 id);
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/** Associate data with a conversation.
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* @param conv Conversation. Must not be NULL.
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* @param proto Protocol ID.
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* @param proto_data Pointer to the data to associate.
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*/
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WS_DLL_PUBLIC void conversation_add_proto_data(conversation_t *conv, const int proto, void *proto_data);
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/** Fetch data associated with a conversation.
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* @param conv Conversation. Must not be NULL.
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* @param proto Protocol ID.
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* @return The data previously set with conversation_add_proto_data, otherwise NULL.
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*/
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WS_DLL_PUBLIC void *conversation_get_proto_data(const conversation_t *conv, const int proto);
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/** Remove data associated with a conversation.
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* @param conv Conversation. Must not be NULL.
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* @param proto Protocol ID.
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*/
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WS_DLL_PUBLIC void conversation_delete_proto_data(conversation_t *conv, const int proto);
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WS_DLL_PUBLIC void conversation_set_dissector(conversation_t *conversation, const dissector_handle_t handle);
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WS_DLL_PUBLIC void conversation_set_dissector_from_frame_number(conversation_t *conversation,
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const guint32 starting_frame_num, const dissector_handle_t handle);
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WS_DLL_PUBLIC dissector_handle_t conversation_get_dissector(conversation_t *conversation, const guint32 frame_num);
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/**
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* Save address+port information in the current packet info; it can be matched
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* by find_conversation_pinfo or find_conversation.
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* Supports wildcarding.
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* @param pinfo Packet info.
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* @param addr1 The first address in the identifying tuple.
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* @param addr2 The second address in the identifying tuple.
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* @param ctype The conversation type.
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* @param port1 The first port in the identifying tuple.
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* @param port2 The second port in the identifying tuple.
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*/
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WS_DLL_PUBLIC void conversation_set_conv_addr_port_endpoints(struct _packet_info *pinfo, address* addr1, address* addr2,
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conversation_type ctype, guint32 port1, guint32 port2);
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/**
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* Save conversation elements including ID information in the current
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* packet info which can be matched by conversation_get_id_from_elements.
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* Does not support wildcarding.
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* @param pinfo Packet info.
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* @param ctype The conversation type.
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* @param id A unique ID.
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*/
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WS_DLL_PUBLIC void conversation_set_elements_by_id(struct _packet_info *pinfo,
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conversation_type ctype, guint32 id);
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/**
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* @brief Get the ID value from the conversation elements in the packet info.
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* @param pinfo Packet info.
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* @param ctype The conversation type.
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* @param options USE_LAST_ENDPOINT or 0.
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* @return The ID value from the elements if successful, or 0
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* on failure.
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*/
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WS_DLL_PUBLIC guint32 conversation_get_id_from_elements(struct _packet_info *pinfo,
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conversation_type ctype, const guint options);
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/**
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* Given two address/port pairs for a packet, search for a matching
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* conversation and, if found and it has a conversation dissector,
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* call that dissector and return TRUE, otherwise return FALSE.
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*
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* This helper uses call_dissector_only which will NOT call the default
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* "data" dissector if the packet was rejected.
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* Our caller is responsible to call the data dissector explicitly in case
|
|
* this function returns FALSE.
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*/
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WS_DLL_PUBLIC gboolean try_conversation_dissector(const address *addr_a, const address *addr_b, const conversation_type ctype,
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const guint32 port_a, const guint32 port_b, tvbuff_t *tvb, packet_info *pinfo,
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|
proto_tree *tree, void* data, const guint options);
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|
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|
WS_DLL_PUBLIC gboolean try_conversation_dissector_by_id(const conversation_type ctype, const guint32 id, tvbuff_t *tvb,
|
|
packet_info *pinfo, proto_tree *tree, void* data);
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|
|
|
/* These routines are used to set undefined values for a conversation */
|
|
|
|
/**
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|
* Set the second port in a conversation created with conversation_new.
|
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* @param conv Conversation. Must be created with conversation_new.
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* @param port The second port to set.
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|
*/
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|
WS_DLL_PUBLIC void conversation_set_port2(conversation_t *conv, const guint32 port);
|
|
|
|
/**
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|
* Set the second address in a conversation created with conversation_new.
|
|
* @param conv Conversation. Must be created with conversation_new.
|
|
* @param addr The second address to set.
|
|
*/
|
|
WS_DLL_PUBLIC void conversation_set_addr2(conversation_t *conv, const address *addr);
|
|
|
|
/**
|
|
* @brief Get a hash table of conversation hash table.
|
|
*
|
|
* @return A wmem_map_t * of (const char *: wmem_map_t *).
|
|
* Each value is a wmem_map_t * of (const conversation_element_t *: void *).
|
|
*/
|
|
WS_DLL_PUBLIC wmem_map_t *get_conversation_hashtables(void);
|
|
|
|
/* Temporary function to handle port_type to conversation_type conversion
|
|
For now it's a 1-1 mapping, but the intention is to remove
|
|
many of the port_type instances in favor of conversation_type
|
|
*/
|
|
WS_DLL_PUBLIC conversation_type conversation_pt_to_conversation_type(port_type pt);
|
|
|
|
/* Temporary function to handle port_type to endpoint_type conversion
|
|
For now it's a 1-1 mapping, but the intention is to remove
|
|
many of the port_type instances in favor of endpoint_type
|
|
*/
|
|
WS_DLL_PUBLIC endpoint_type conversation_pt_to_endpoint_type(port_type pt);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif /* __cplusplus */
|
|
|
|
#endif /* conversation.h */
|