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/* $OpenBSD: transport.h,v 1.24 2022/01/28 05:24:15 guenther Exp $ */
/* $EOM: transport.h,v 1.16 2000/07/17 18:57:59 provos Exp $ */
/*
* Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved.
* Copyright (c) 2001, 2004 Håkan Olsson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
/*
* The transport module tries to separate out details concerning the
* actual transferral of ISAKMP messages to other parties.
*/
#ifndef _TRANSPORT_H_
#define _TRANSPORT_H_
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include "message.h"
struct transport;
LIST_HEAD(transport_list, transport);
extern struct transport_list transport_list;
/* This describes a transport "method" like UDP or similar. */
struct transport_vtbl {
/* All transport methods are linked together. */
LIST_ENTRY(transport_vtbl) link;
/* A textual name of the transport method. */
char *name;
/* Create a transport instance of this method. */
struct transport *(*create) (char *);
/* Reinitialize specific transport. */
void (*reinit) (void);
/* Remove a transport instance of this method. */
void (*remove) (struct transport *);
/* Report status of given transport */
void (*report) (struct transport *);
/* Let the given transport set its bit in the fd_set passed in. */
int (*fd_set) (struct transport *, fd_set *, int);
/* Is the given transport ready for I/O? */
int (*fd_isset) (struct transport *, fd_set *);
/*
* Read a message from the transport's incoming pipe and start
* handling it.
*/
void (*handle_message) (struct transport *);
/* Send a message through the outgoing pipe. */
int (*send_message) (struct message *, struct transport *);
/*
* Fill out a sockaddr structure with the transport's destination end's
* address info.
*/
void (*get_dst) (struct transport *, struct sockaddr **);
/*
* Fill out a sockaddr structure with the transport's source end's
* address info.
*/
void (*get_src) (struct transport *, struct sockaddr **);
/*
* Return a string with decoded src and dst information
*/
char *(*decode_ids) (struct transport *);
/*
* Clone a transport for outbound use.
*/
struct transport *(*clone) (struct transport *, struct sockaddr *);
/*
* Locate the correct sendq to use for outbound messages.
*/
struct msg_head *(*get_queue) (struct message *);
};
struct transport {
/* All transports used are linked together. */
LIST_ENTRY(transport) link;
/* What transport method is this an instance of? */
struct transport_vtbl *vtbl;
/* The queue holding messages to send on this transport. */
struct msg_head sendq;
/*
* Prioritized send queue. Messages in this queue will be transmitted
* before the normal sendq, they will also all be transmitted prior
* to a daemon shutdown. Currently only used for DELETE notifications.
*/
struct msg_head prio_sendq;
/* Flags describing the transport. */
int flags;
/* Reference counter. */
int refcnt;
/* Pointer to parent virtual transport, if any. */
struct transport *virtual;
};
/* Set if this is a transport we want to listen on. */
#define TRANSPORT_LISTEN 1
/* Used for mark-and-sweep-type garbage collection of transports */
#define TRANSPORT_MARK 2
extern struct transport *transport_create(char *, char *);
extern int transport_fd_set(fd_set *);
extern void transport_handle_messages(fd_set *);
extern void transport_init(void);
extern void transport_method_add(struct transport_vtbl *);
extern int transport_pending_wfd_set(fd_set *);
extern int transport_prio_sendqs_empty(void);
extern void transport_reference(struct transport *);
extern void transport_reinit(void);
extern void transport_release(struct transport *);
extern void transport_report(void);
extern void transport_send_messages(fd_set *);
extern void transport_setup(struct transport *, int);
#endif /* _TRANSPORT_H_ */
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