blob: defb19721fbc72c5470df94da1af54833bea88bf [file] [log] [blame]
/*
* Protocol registration functions.
*
* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <haproxy/api.h>
#include <haproxy/errors.h>
#include <haproxy/list.h>
#include <common/standard.h>
#include <haproxy/protocol.h>
/* List head of all registered protocols */
static struct list protocols = LIST_HEAD_INIT(protocols);
struct protocol *__protocol_by_family[AF_CUST_MAX] = { };
/* This is the global spinlock we may need to register/unregister listeners or
* protocols. Its main purpose is in fact to serialize the rare stop/deinit()
* phases.
*/
__decl_spinlock(proto_lock);
/* Registers the protocol <proto> */
void protocol_register(struct protocol *proto)
{
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
LIST_ADDQ(&protocols, &proto->list);
if (proto->sock_domain >= 0 && proto->sock_domain < AF_CUST_MAX)
__protocol_by_family[proto->sock_domain] = proto;
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}
/* Unregisters the protocol <proto>. Note that all listeners must have
* previously been unbound.
*/
void protocol_unregister(struct protocol *proto)
{
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
LIST_DEL(&proto->list);
LIST_INIT(&proto->list);
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}
/* binds all listeners of all registered protocols. Returns a composition
* of ERR_NONE, ERR_RETRYABLE, ERR_FATAL.
*/
int protocol_bind_all(char *errmsg, int errlen)
{
struct protocol *proto;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
if (proto->bind_all) {
err |= proto->bind_all(proto, errmsg, errlen);
if ( err & ERR_ABORT )
break;
}
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* unbinds all listeners of all registered protocols. They are also closed.
* This must be performed before calling exit() in order to get a chance to
* remove file-system based sockets and pipes.
* Returns a composition of ERR_NONE, ERR_RETRYABLE, ERR_FATAL, ERR_ABORT.
*/
int protocol_unbind_all(void)
{
struct protocol *proto;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
if (proto->unbind_all) {
err |= proto->unbind_all(proto);
}
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* enables all listeners of all registered protocols. This is intended to be
* used after a fork() to enable reading on all file descriptors. Returns a
* composition of ERR_NONE, ERR_RETRYABLE, ERR_FATAL.
*/
int protocol_enable_all(void)
{
struct protocol *proto;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
if (proto->enable_all) {
err |= proto->enable_all(proto);
}
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* disables all listeners of all registered protocols. This may be used before
* a fork() to avoid duplicating poll lists. Returns a composition of ERR_NONE,
* ERR_RETRYABLE, ERR_FATAL.
*/
int protocol_disable_all(void)
{
struct protocol *proto;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
if (proto->disable_all) {
err |= proto->disable_all(proto);
}
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/