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haproxy/src/protocol.c
Willy Tarreau 61cfdf4fd8 CLEANUP: tree-wide: replace free(x);x=NULL with ha_free(&x) 
This makes the code more readable and less prone to copy-paste errors.
In addition, it allows to place some __builtin_constant_p() predicates
to trigger a link-time error in case the compiler knows that the freed
area is constant. It will also produce compile-time error if trying to
free something that is not a regular pointer (e.g. a function).

The DEBUG_MEM_STATS macro now also defines an instance for ha_free()
so that all these calls can be checked.

178 occurrences were converted. The vast majority of them were handled
by the following Coccinelle script, some slightly refined to better deal
with "&*x" or with long lines:

  @ rule @
  expression E;
  @@
  - free(E);
  - E = NULL;
  + ha_free(&E);

It was verified that the resulting code is the same, more or less a
handful of cases where the compiler optimized slightly differently
the temporary variable that holds the copy of the pointer.

A non-negligible amount of {free(str);str=NULL;str_len=0;} are still
present in the config part (mostly header names in proxies). These
ones should also be cleaned for the same reasons, and probably be
turned into ist strings.
2021-02-26 21:21:09 +01:00

231 lines
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/*
* 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 <haproxy/listener.h>
#include <haproxy/protocol.h>
#include <haproxy/proxy.h>
#include <haproxy/tools.h>
/* List head of all registered protocols */
static struct list protocols = LIST_HEAD_INIT(protocols);
struct protocol *__protocol_by_family[AF_CUST_MAX][2][2] = { };
/* 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->fam->sock_domain >= 0 && proto->fam->sock_domain < AF_CUST_MAX)
__protocol_by_family[proto->fam->sock_domain]
[proto->sock_type == SOCK_DGRAM]
[proto->ctrl_type == SOCK_DGRAM] = 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(int verbose)
{
struct protocol *proto;
struct listener *listener;
struct receiver *receiver;
char msg[100];
char *errmsg;
int err, lerr;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(receiver, &proto->receivers, proto_list) {
listener = LIST_ELEM(receiver, struct listener *, rx);
lerr = proto->fam->bind(receiver, &errmsg);
err |= lerr;
/* errors are reported if <verbose> is set or if they are fatal */
if (verbose || (lerr & (ERR_FATAL | ERR_ABORT))) {
struct proxy *px = listener->bind_conf->frontend;
if (lerr & ERR_ALERT)
ha_alert("Starting %s %s: %s\n",
proxy_type_str(px), px->id, errmsg);
else if (lerr & ERR_WARN)
ha_warning("Starting %s %s: %s\n",
proxy_type_str(px), px->id, errmsg);
ha_free(&errmsg);
}
if (lerr & ERR_ABORT)
break;
if (lerr & ~ERR_WARN)
continue;
/* for now there's still always a listening function */
BUG_ON(!proto->listen);
lerr = proto->listen(listener, msg, sizeof(msg));
err |= lerr;
if (verbose || (lerr & (ERR_FATAL | ERR_ABORT))) {
struct proxy *px = listener->bind_conf->frontend;
if (lerr & ERR_ALERT)
ha_alert("Starting %s %s: %s\n",
proxy_type_str(px), px->id, msg);
else if (lerr & ERR_WARN)
ha_warning("Starting %s %s: %s\n",
proxy_type_str(px), px->id, msg);
}
if (lerr & ERR_ABORT)
break;
}
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;
struct listener *listener;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(listener, &proto->receivers, rx.proto_list)
unbind_listener(listener);
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* stops all listeners of all registered protocols, except when the belong to a
* proxy configured with a grace time. This will normally catch every single
* listener, all protocols included, and the grace ones will have to be handled
* by the proxy stopping loop. This is to be used during soft_stop() only. It
* does not return any error.
*/
void protocol_stop_now(void)
{
struct protocol *proto;
struct listener *listener, *lback;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry_safe(listener, lback, &proto->receivers, rx.proto_list)
if (!listener->bind_conf->frontend->grace)
stop_listener(listener, 0, 1, 0);
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
}
/* pauses all listeners of all registered protocols. This is typically
* used on SIG_TTOU to release all listening sockets for the time needed to
* try to bind a new process. The listeners enter LI_PAUSED. It returns
* ERR_NONE, with ERR_FATAL on failure.
*/
int protocol_pause_all(void)
{
struct protocol *proto;
struct listener *listener;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(listener, &proto->receivers, rx.proto_list)
if (!pause_listener(listener))
err |= ERR_FATAL;
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return err;
}
/* resumes all listeners of all registered protocols. This is typically used on
* SIG_TTIN to re-enable listening sockets after a new process failed to bind.
* The listeners switch to LI_READY/LI_FULL. It returns ERR_NONE, with ERR_FATAL
* on failure.
*/
int protocol_resume_all(void)
{
struct protocol *proto;
struct listener *listener;
int err;
err = 0;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(listener, &proto->receivers, rx.proto_list)
if (!resume_listener(listener))
err |= ERR_FATAL;
}
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
* composition of ERR_NONE.
*/
int protocol_enable_all(void)
{
struct protocol *proto;
struct listener *listener;
HA_SPIN_LOCK(PROTO_LOCK, &proto_lock);
list_for_each_entry(proto, &protocols, list) {
list_for_each_entry(listener, &proto->receivers, rx.proto_list)
enable_listener(listener);
}
HA_SPIN_UNLOCK(PROTO_LOCK, &proto_lock);
return ERR_NONE;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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