forked from osmocom/wireshark
a96e6b2047
svn path=/trunk/; revision=33981
184 lines
6.8 KiB
C++
184 lines
6.8 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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* $Id$
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __CONVERSATION_H__
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#define __CONVERSATION_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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*/
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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_ADDR_B 0x01
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#define NO_PORT_B 0x02
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#include "packet.h" /* for conversation dissector type */
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/**
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* Data structure representing a conversation.
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*/
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typedef struct conversation_key {
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struct conversation_key *next;
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address addr1;
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address addr2;
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port_type ptype;
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guint32 port1;
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guint32 port2;
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} conversation_key;
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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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guint32 index; /** unique ID for conversation */
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guint32 setup_frame; /** frame number that setup this conversation */
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GSList *data_list; /** list of data associated with conversation */
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dissector_handle_t dissector_handle;
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/** handle for protocol dissector client associated with conversation */
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guint options; /** wildcard flags */
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conversation_key *key_ptr; /** pointer to the key for this conversation */
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} conversation_t;
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/**
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* Destroy all existing conversations
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*/
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extern void conversation_cleanup(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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* Create a new hash table for the conversations in the new file.
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*/
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extern void conversation_init(void);
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/*
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* Given two address/port pairs for a packet, create a new conversation
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* to contain packets between those 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.
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*/
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extern conversation_t *conversation_new(const guint32 setup_frame, const address *addr1, const address *addr2,
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const port_type ptype, const guint32 port1, const guint32 port2, const guint options);
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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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extern conversation_t *find_conversation(const guint32 frame_num, const address *addr_a, const address *addr_b,
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const port_type ptype, const guint32 port_a, const guint32 port_b, const guint options);
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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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extern conversation_t *find_or_create_conversation(packet_info *pinfo);
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extern void conversation_add_proto_data(conversation_t *conv, const int proto,
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void *proto_data);
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extern void *conversation_get_proto_data(const conversation_t *conv, const int proto);
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extern void conversation_delete_proto_data(conversation_t *conv, const int proto);
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extern void conversation_set_dissector(conversation_t *conversation,
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const dissector_handle_t handle);
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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 explicitely in case
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* this function returns FALSE.
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*/
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extern gboolean
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try_conversation_dissector(const address *addr_a, const address *addr_b, const port_type ptype,
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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);
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/* These routines are used to set undefined values for a conversation */
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extern void conversation_set_port2(conversation_t *conv, const guint32 port);
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extern void conversation_set_addr2(conversation_t *conv, const address *addr);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* conversation.h */
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