wireshark/epan/conversation.h

/* conversation.h
 * Routines for building lists of packets that are part of a "conversation"
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#ifndef __CONVERSATION_H__
#define __CONVERSATION_H__

#include "ws_symbol_export.h"

#include "packet.h"			/* for conversation dissector type */

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 *@file
 */
/*
 * Flags to pass to "conversation_new()" to indicate that the address 2
 * and/or port 2 values for the conversation should be wildcards.
 * The CONVERSATION_TEMPLATE option tells that any of the other supplied
 * port and / or address wildcards will be used to match an infinite number
 * of new connections to the conversation(s) that have the CONVERSATION_-
 * TEMPLATE flag set. Any conversation created without the CONVERSATION_-
 * TEMPLATE flag will be altered once the first connections (connection
 * oriented protocols only) to include the newly found information which
 * matched the wildcard options.
 */
#define NO_ADDR2 0x01
#define NO_PORT2 0x02
#define NO_PORT2_FORCE 0x04
#define CONVERSATION_TEMPLATE 0x08

/*
 * Flags to pass to "find_conversation()" to indicate that the address B
 * and/or port B search arguments are wildcards.
 */
#define NO_ADDR_B 0x01
#define NO_PORT_B 0x02

/* Flags to handle endpoints */
#define USE_LAST_ENDPOINT 0x08		/* Use last endpoint created, regardless of type */

/* Types of port numbers Wireshark knows about. */
typedef enum {
	ENDPOINT_NONE,			/* no endpoint */
	ENDPOINT_SCTP,			/* SCTP */
	ENDPOINT_TCP,			/* TCP */
	ENDPOINT_UDP,			/* UDP */
	ENDPOINT_DCCP,			/* DCCP */
	ENDPOINT_IPX,			/* IPX sockets */
	ENDPOINT_NCP,			/* NCP connection */
	ENDPOINT_EXCHG,			/* Fibre Channel exchange */
	ENDPOINT_DDP,			/* DDP AppleTalk connection */
	ENDPOINT_SBCCS,			/* FICON */
	ENDPOINT_IDP,			/* XNS IDP sockets */
	ENDPOINT_TIPC,			/* TIPC PORT */
	ENDPOINT_USB,			/* USB endpoint 0xffff means the host */
	ENDPOINT_I2C,
	ENDPOINT_IBQP,			/* Infiniband QP number */
	ENDPOINT_BLUETOOTH,
	ENDPOINT_TDMOP,
	ENDPOINT_DVBCI,
	ENDPOINT_ISO14443,
	ENDPOINT_ISDN,			/* ISDN channel number */
	ENDPOINT_H223,			/* H.223 logical channel number */
	ENDPOINT_X25,			/* X.25 logical channel number */
	ENDPOINT_IAX2,			/* IAX2 call id */
	ENDPOINT_DLCI,			/* Frame Relay DLCI */
	ENDPOINT_ISUP,			/* ISDN User Part CIC */
	ENDPOINT_BICC,			/* BICC Circuit identifier */
	ENDPOINT_GSMTAP,
	ENDPOINT_IUUP,
	ENDPOINT_DVBBBF                 /* DVB Base Band Frame ISI/PLP_ID */
} endpoint_type;

/**
 * Data structure representing a conversation.
 */
struct conversation_key;
typedef struct conversation_key* conversation_key_t;

typedef struct conversation {
	struct conversation *next;	/** pointer to next conversation on hash chain */
	struct conversation *last;	/** pointer to the last conversation on hash chain */
	struct conversation *latest_found; /** pointer to the last conversation on hash chain */
	guint32	conv_index;		/** unique ID for conversation */
	guint32 setup_frame;		/** frame number that setup this conversation */
					/* Assume that setup_frame is also the lowest frame number for now. */
	guint32 last_frame;		/** highest frame number in this conversation */
	wmem_tree_t *data_list;		/** list of data associated with conversation */
	wmem_tree_t *dissector_tree;	/** tree containing protocol dissector client associated with conversation */
	guint	options;		/** wildcard flags */
	conversation_key_t key_ptr;	/** pointer to the key for this conversation */
} conversation_t;


struct endpoint;
typedef struct endpoint* endpoint_t;

WS_DLL_PUBLIC address* conversation_key_addr1(const conversation_key_t key);
WS_DLL_PUBLIC address* conversation_key_addr2(const conversation_key_t key);
WS_DLL_PUBLIC guint32 conversation_key_port1(const conversation_key_t key);
WS_DLL_PUBLIC guint32 conversation_key_port2(const conversation_key_t key);

/**
 * Create a new hash tables for conversations.
 */
extern void conversation_init(void);

/**
 * Initialize some variables every time a file is loaded or re-loaded.
 */
extern void conversation_epan_reset(void);

/*
 * Given two address/port pairs for a packet, create a new conversation
 * to contain packets between those address/port pairs.
 *
 * The options field is used to specify whether the address 2 value
 * and/or port 2 value are not given and any value is acceptable
 * when searching for this conversation.
 */
WS_DLL_PUBLIC conversation_t *conversation_new(const guint32 setup_frame, const address *addr1, const address *addr2,
    const endpoint_type etype, const guint32 port1, const guint32 port2, const guint options);

WS_DLL_PUBLIC conversation_t *conversation_new_by_id(const guint32 setup_frame, const endpoint_type etype, const guint32 id, const guint options);

/**
 * Given two address/port pairs for a packet, search for a conversation
 * containing packets between those address/port pairs.  Returns NULL if
 * not found.
 *
 * We try to find the most exact match that we can, and then proceed to
 * try wildcard matches on the "addr_b" and/or "port_b" argument if a more
 * exact match failed.
 *
 * Either or both of the "addr_b" and "port_b" arguments may be specified as
 * a wildcard by setting the NO_ADDR_B or NO_PORT_B flags in the "options"
 * argument.  We do only wildcard matches on addresses and ports specified
 * as wildcards.
 *
 * I.e.:
 *
 *	if neither "addr_b" nor "port_b" were specified as wildcards, we
 *	do an exact match (addr_a/port_a and addr_b/port_b) and, if that
 *	succeeds, we return a pointer to the matched conversation;
 *
 *	otherwise, if "port_b" wasn't specified as a wildcard, we try to
 *	match any address 2 with the specified port 2 (addr_a/port_a and
 *	{any}/addr_b) and, if that succeeds, we return a pointer to the
 *	matched conversation;
 *
 *	otherwise, if "addr_b" wasn't specified as a wildcard, we try to
 *	match any port 2 with the specified address 2 (addr_a/port_a and
 *	addr_b/{any}) and, if that succeeds, we return a pointer to the
 *	matched conversation;
 *
 *	otherwise, we try to match any address 2 and any port 2
 *	(addr_a/port_a and {any}/{any}) and, if that succeeds, we return
 *	a pointer to the matched conversation;
 *
 *	otherwise, we found no matching conversation, and return NULL.
 */
WS_DLL_PUBLIC conversation_t *find_conversation(const guint32 frame_num, const address *addr_a, const address *addr_b,
    const endpoint_type etype, const guint32 port_a, const guint32 port_b, const guint options);

WS_DLL_PUBLIC conversation_t *find_conversation_by_id(const guint32 frame, const endpoint_type etype, const guint32 id, const guint options);

/**  A helper function that calls find_conversation() using data from pinfo
 *  The frame number and addresses are taken from pinfo.
 */
WS_DLL_PUBLIC conversation_t *find_conversation_pinfo(packet_info *pinfo, const guint options);

/**  A helper function that calls find_conversation() and, if a conversation is
 *  not found, calls conversation_new().
 *  The frame number and addresses are taken from pinfo.
 *  No options are used, though we could extend this API to include an options
 *  parameter.
 */
WS_DLL_PUBLIC conversation_t *find_or_create_conversation(packet_info *pinfo);

/**  A helper function that calls find_conversation_by_id() and, if a
 *  conversation is not found, calls conversation_new_by_id().
 *  The frame number is taken from pinfo.
 */
WS_DLL_PUBLIC conversation_t *find_or_create_conversation_by_id(packet_info *pinfo, const endpoint_type etype, const guint32 id);

WS_DLL_PUBLIC void conversation_add_proto_data(conversation_t *conv, const int proto,
    void *proto_data);
WS_DLL_PUBLIC void *conversation_get_proto_data(const conversation_t *conv, const int proto);
WS_DLL_PUBLIC void conversation_delete_proto_data(conversation_t *conv, const int proto);

WS_DLL_PUBLIC void conversation_set_dissector(conversation_t *conversation,
    const dissector_handle_t handle);

WS_DLL_PUBLIC void conversation_set_dissector_from_frame_number(conversation_t *conversation,
    const guint32 starting_frame_num, const dissector_handle_t handle);

WS_DLL_PUBLIC dissector_handle_t conversation_get_dissector(conversation_t *conversation,
    const guint32 frame_num);

WS_DLL_PUBLIC void conversation_create_endpoint(struct _packet_info *pinfo, address* addr1, address* addr2,
    endpoint_type etype, guint32 port1, guint32	port2, const guint options);

WS_DLL_PUBLIC void conversation_create_endpoint_by_id(struct _packet_info *pinfo,
    endpoint_type etype, guint32 id, const guint options);

WS_DLL_PUBLIC guint32 conversation_get_endpoint_by_id(struct _packet_info *pinfo,
    endpoint_type etype, const guint options);

/**
 * Given two address/port pairs for a packet, search for a matching
 * conversation and, if found and it has a conversation dissector,
 * call that dissector and return TRUE, otherwise return FALSE.
 *
 * This helper uses call_dissector_only which will NOT call the default
 * "data" dissector if the packet was rejected.
 * Our caller is responsible to call the data dissector explicitly in case
 * this function returns FALSE.
 */
WS_DLL_PUBLIC gboolean
try_conversation_dissector(const address *addr_a, const address *addr_b, const endpoint_type etype,
    const guint32 port_a, const guint32 port_b, tvbuff_t *tvb, packet_info *pinfo,
    proto_tree *tree, void* data, const guint options);

WS_DLL_PUBLIC gboolean
try_conversation_dissector_by_id(const endpoint_type etype, const guint32 id, tvbuff_t *tvb,
    packet_info *pinfo, proto_tree *tree, void* data);

/* These routines are used to set undefined values for a conversation */

WS_DLL_PUBLIC
void conversation_set_port2(conversation_t *conv, const guint32 port);
WS_DLL_PUBLIC
void conversation_set_addr2(conversation_t *conv, const address *addr);

WS_DLL_PUBLIC
wmem_map_t *get_conversation_hashtable_exact(void);

WS_DLL_PUBLIC
wmem_map_t *get_conversation_hashtable_no_addr2(void);

WS_DLL_PUBLIC
wmem_map_t * get_conversation_hashtable_no_port2(void);

WS_DLL_PUBLIC
wmem_map_t *get_conversation_hashtable_no_addr2_or_port2(void);

/* 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);

WS_DLL_PUBLIC guint
conversation_hash_exact(gconstpointer v);

/* Provide a wmem_alloced (NULL scope) hash string using HTML tags */
WS_DLL_PUBLIC gchar*
conversation_get_html_hash(const conversation_key_t key);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* conversation.h */