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nginx/src/core/ngx_connection.c
Igor Sysoev cdf609a925 nginx-0.3.39-RELEASE import 
*) Feature: the "uninitialized_variable_warn" directive; the logging
       level of the "uninitialized variable" message was lowered from
       "alert" to "warn".

    *) Feature: the "override_charset" directive.

    *) Change: now if the unknown variable is used in the "echo" and "if
       expr='$name'" SSI-commands, then the "unknown variable" message is
       not logged.

    *) Bugfix: the active connection counter increased on the exceeding of
       the connection limit specified by the "worker_connections"
       directive; the bug had appeared in 0.2.0.

    *) Bugfix: the limit rate might not work on some condition; the bug had
       appeared in 0.3.38.
2006-04-17 19:55:41 +00:00

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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
ngx_os_io_t ngx_io;
ngx_listening_t *
ngx_listening_inet_stream_socket(ngx_conf_t *cf, in_addr_t addr, in_port_t port)
{
size_t len;
ngx_listening_t *ls;
struct sockaddr_in *sin;
ls = ngx_array_push(&cf->cycle->listening);
if (ls == NULL) {
return NULL;
}
ngx_memzero(ls, sizeof(ngx_listening_t));
sin = ngx_pcalloc(cf->pool, sizeof(struct sockaddr_in));
if (sin == NULL) {
return NULL;
}
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr;
sin->sin_port = htons(port);
ls->addr_text.data = ngx_palloc(cf->pool,
INET_ADDRSTRLEN - 1 + sizeof(":65535") - 1);
if (ls->addr_text.data == NULL) {
return NULL;
}
len = ngx_inet_ntop(AF_INET, &addr, ls->addr_text.data, INET_ADDRSTRLEN);
ls->addr_text.len = ngx_sprintf(ls->addr_text.data + len, ":%d", port)
- ls->addr_text.data;
ls->fd = (ngx_socket_t) -1;
ls->family = AF_INET;
ls->type = SOCK_STREAM;
ls->sockaddr = (struct sockaddr *) sin;
ls->socklen = sizeof(struct sockaddr_in);
ls->addr = offsetof(struct sockaddr_in, sin_addr);
ls->addr_text_max_len = INET_ADDRSTRLEN;
return ls;
}
ngx_int_t
ngx_set_inherited_sockets(ngx_cycle_t *cycle)
{
size_t len;
ngx_uint_t i;
ngx_listening_t *ls;
struct sockaddr_in *sin;
socklen_t olen;
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
ngx_err_t err;
struct accept_filter_arg af;
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
int timeout;
#endif
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
/* AF_INET only */
ls[i].sockaddr = ngx_palloc(cycle->pool, sizeof(struct sockaddr_in));
if (ls[i].sockaddr == NULL) {
return NGX_ERROR;
}
ls[i].socklen = sizeof(struct sockaddr_in);
if (getsockname(ls[i].fd, ls[i].sockaddr, &ls[i].socklen) == -1) {
ngx_log_error(NGX_LOG_CRIT, cycle->log, ngx_socket_errno,
"getsockname() of the inherited "
"socket #%d failed", ls[i].fd);
ls[i].ignore = 1;
continue;
}
sin = (struct sockaddr_in *) ls[i].sockaddr;
if (sin->sin_family != AF_INET) {
ngx_log_error(NGX_LOG_CRIT, cycle->log, ngx_socket_errno,
"the inherited socket #%d has "
"unsupported family", ls[i].fd);
ls[i].ignore = 1;
continue;
}
ls[i].addr_text_max_len = INET_ADDRSTRLEN;
ls[i].addr_text.data = ngx_palloc(cycle->pool, INET_ADDRSTRLEN - 1
+ sizeof(":65535") - 1);
if (ls[i].addr_text.data == NULL) {
return NGX_ERROR;
}
ls[i].family = sin->sin_family;
len = ngx_sock_ntop(ls[i].family, ls[i].sockaddr,
ls[i].addr_text.data, INET_ADDRSTRLEN);
if (len == 0) {
return NGX_ERROR;
}
ls[i].addr_text.len = ngx_sprintf(ls[i].addr_text.data + len, ":%d",
ntohs(sin->sin_port))
- ls[i].addr_text.data;
ls[i].backlog = -1;
olen = sizeof(int);
if (getsockopt(ls[i].fd, SOL_SOCKET, SO_RCVBUF, (void *) &ls[i].rcvbuf,
&olen)
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno,
"getsockopt(SO_RCVBUF) %V failed, ignored",
&ls[i].addr_text);
ls[i].rcvbuf = -1;
}
olen = sizeof(int);
if (getsockopt(ls[i].fd, SOL_SOCKET, SO_SNDBUF, (void *) &ls[i].sndbuf,
&olen)
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno,
"getsockopt(SO_SNDBUF) %V failed, ignored",
&ls[i].addr_text);
ls[i].sndbuf = -1;
}
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
ngx_memzero(&af, sizeof(struct accept_filter_arg));
olen = sizeof(struct accept_filter_arg);
if (getsockopt(ls[i].fd, SOL_SOCKET, SO_ACCEPTFILTER, &af, &olen)
== -1)
{
err = ngx_errno;
if (err == NGX_EINVAL) {
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, err,
"getsockopt(SO_ACCEPTFILTER) for %V failed, ignored",
&ls[i].addr_text);
continue;
}
if (olen < sizeof(struct accept_filter_arg) || af.af_name[0] == '\0') {
continue;
}
ls[i].accept_filter = ngx_palloc(cycle->pool, 16);
if (ls[i].accept_filter == NULL) {
return NGX_ERROR;
}
(void) ngx_cpystrn((u_char *) ls[i].accept_filter,
(u_char *) af.af_name, 16);
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
timeout = 0;
olen = sizeof(int);
if (getsockopt(ls[i].fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &timeout, &olen)
== -1)
{
ngx_log_error(NGX_LOG_NOTICE, cycle->log, ngx_errno,
"getsockopt(TCP_DEFER_ACCEPT) for %V failed, ignored",
&ls[i].addr_text);
continue;
}
if (olen < sizeof(int) || timeout == 0) {
continue;
}
ls[i].deferred_accept = 1;
#endif
}
return NGX_OK;
}
ngx_int_t
ngx_open_listening_sockets(ngx_cycle_t *cycle)
{
int reuseaddr;
ngx_uint_t i, tries, failed;
ngx_err_t err;
ngx_log_t *log;
ngx_socket_t s;
ngx_listening_t *ls;
reuseaddr = 1;
#if (NGX_SUPPRESS_WARN)
failed = 0;
#endif
log = cycle->log;
/* TODO: configurable try number */
for (tries = 5 ; tries; tries--) {
failed = 0;
/* for each listening socket */
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
if (ls[i].ignore) {
continue;
}
if (ls[i].fd != -1) {
continue;
}
if (ls[i].inherited) {
/* TODO: close on exit */
/* TODO: nonblocking */
/* TODO: deferred accept */
continue;
}
s = ngx_socket(ls[i].family, ls[i].type, 0);
if (s == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_socket_n " %V failed", &ls[i].addr_text);
return NGX_ERROR;
}
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(const void *) &reuseaddr, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(SO_REUSEADDR) %V failed",
&ls[i].addr_text);
if (ngx_close_socket(s) == -1)
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
return NGX_ERROR;
}
/* TODO: close on exit */
if (!(ngx_event_flags & NGX_USE_AIO_EVENT)) {
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_nonblocking_n " %V failed",
&ls[i].addr_text);
if (ngx_close_socket(s) == -1)
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
return NGX_ERROR;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"bind() %V #%d ", &ls[i].addr_text, s);
if (bind(s, ls[i].sockaddr, ls[i].socklen) == -1) {
err = ngx_socket_errno;
if (err == NGX_EADDRINUSE && ngx_test_config) {
continue;
}
ngx_log_error(NGX_LOG_EMERG, log, err,
"bind() to %V failed", &ls[i].addr_text);
if (ngx_close_socket(s) == -1)
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
if (err != NGX_EADDRINUSE) {
return NGX_ERROR;
}
failed = 1;
continue;
}
ls[i].listen = 1;
ls[i].fd = s;
}
if (!failed) {
break;
}
/* TODO: delay configurable */
ngx_log_error(NGX_LOG_NOTICE, log, 0,
"try again to bind() after 500ms");
ngx_msleep(500);
}
if (failed) {
ngx_log_error(NGX_LOG_EMERG, log, 0, "still could not bind()");
return NGX_ERROR;
}
return NGX_OK;
}
void
ngx_configure_listening_socket(ngx_cycle_t *cycle)
{
ngx_uint_t i;
ngx_listening_t *ls;
#if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
struct accept_filter_arg af;
#endif
#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
int timeout;
#endif
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
if (ls[i].rcvbuf != -1) {
if (setsockopt(ls[i].fd, SOL_SOCKET, SO_RCVBUF,
(const void *) &ls[i].rcvbuf, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno,
"setsockopt(SO_RCVBUF, %d) %V failed, ignored",
ls[i].rcvbuf, &ls[i].addr_text);
}
}
if (ls[i].sndbuf != -1) {
if (setsockopt(ls[i].fd, SOL_SOCKET, SO_SNDBUF,
(const void *) &ls[i].sndbuf, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno,
"setsockopt(SO_SNDBUF, %d) %V failed, ignored",
ls[i].sndbuf, &ls[i].addr_text);
}
}
#if 0
if (1) {
int tcp_nodelay = 1;
if (setsockopt(ls[i].fd, IPPROTO_TCP, TCP_NODELAY,
(const void *) &tcp_nodelay, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno,
"setsockopt(TCP_NODELAY) %V failed, ignored",
&ls[i].addr_text);
}
}
#endif
if (ls[i].listen) {
if (listen(ls[i].fd, ls[i].backlog) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno,
"changing the listen() backlog to %d "
"for %V failed, ignored",
&ls[i].addr_text, ls[i].backlog);
}
}
/*
* setting deferred mode should be last operation on socket,
* because code may prematurely continue cycle on failure
*/
#if (NGX_HAVE_DEFERRED_ACCEPT)
#ifdef SO_ACCEPTFILTER
if (ls[i].delete_deferred) {
if (setsockopt(ls[i].fd, SOL_SOCKET, SO_ACCEPTFILTER, NULL, 0)
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setsockopt(SO_ACCEPTFILTER, NULL) "
"for %V failed, ignored",
&ls[i].addr_text);
if (ls[i].accept_filter) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"could not change the accept filter "
"to \"%s\" for %V, ignored",
ls[i].accept_filter, &ls[i].addr_text);
}
continue;
}
ls[i].deferred_accept = 0;
}
if (ls[i].add_deferred) {
ngx_memzero(&af, sizeof(struct accept_filter_arg));
(void) ngx_cpystrn((u_char *) af.af_name,
(u_char *) ls[i].accept_filter, 16);
if (setsockopt(ls[i].fd, SOL_SOCKET, SO_ACCEPTFILTER,
&af, sizeof(struct accept_filter_arg))
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setsockopt(SO_ACCEPTFILTER, \"%s\") "
" for %V failed, ignored",
ls[i].accept_filter, &ls[i].addr_text);
continue;
}
ls[i].deferred_accept = 1;
}
#endif
#ifdef TCP_DEFER_ACCEPT
if (ls[i].add_deferred || ls[i].delete_deferred) {
if (ls[i].add_deferred) {
timeout = (int) (ls[i].post_accept_timeout / 1000);
} else {
timeout = 0;
}
if (setsockopt(ls[i].fd, IPPROTO_TCP, TCP_DEFER_ACCEPT,
&timeout, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setsockopt(TCP_DEFER_ACCEPT, %d) for %V failed, "
"ignored",
timeout, &ls[i].addr_text);
continue;
}
}
if (ls[i].add_deferred) {
ls[i].deferred_accept = 1;
}
#endif
#endif /* NGX_HAVE_DEFERRED_ACCEPT */
}
return;
}
void
ngx_close_listening_sockets(ngx_cycle_t *cycle)
{
ngx_uint_t i;
ngx_listening_t *ls;
ngx_connection_t *c;
if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
return;
}
ngx_accept_mutex_held = 0;
ngx_use_accept_mutex = 0;
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
c = ls[i].connection;
if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
if (c->read->active) {
ngx_del_conn(c, NGX_CLOSE_EVENT);
}
} else {
if (c->read->active) {
ngx_del_event(c->read, NGX_READ_EVENT, NGX_CLOSE_EVENT);
}
}
ngx_free_connection(c);
c->fd = (ngx_socket_t) -1;
ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"close listening %V #%d ", &ls[i].addr_text, ls[i].fd);
if (ngx_close_socket(ls[i].fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed", &ls[i].addr_text);
}
}
}
ngx_connection_t *
ngx_get_connection(ngx_socket_t s, ngx_log_t *log)
{
ngx_uint_t instance;
ngx_event_t *rev, *wev;
ngx_connection_t *c;
/* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
if (ngx_cycle->files && (ngx_uint_t) s >= ngx_cycle->files_n) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
"the new socket has number %d, "
"but only %ui files are available",
s, ngx_cycle->files_n);
return NULL;
}
/* ngx_mutex_lock */
c = ngx_cycle->free_connections;
if (c == NULL) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
"%ui worker_connections is not enough",
ngx_cycle->connection_n);
/* ngx_mutex_unlock */
return NULL;
}
ngx_cycle->free_connections = c->data;
ngx_cycle->free_connection_n--;
/* ngx_mutex_unlock */
if (ngx_cycle->files) {
ngx_cycle->files[s] = c;
}
rev = c->read;
wev = c->write;
ngx_memzero(c, sizeof(ngx_connection_t));
c->read = rev;
c->write = wev;
c->fd = s;
c->log = log;
instance = rev->instance;
ngx_memzero(rev, sizeof(ngx_event_t));
ngx_memzero(wev, sizeof(ngx_event_t));
rev->instance = !instance;
wev->instance = !instance;
rev->index = NGX_INVALID_INDEX;
wev->index = NGX_INVALID_INDEX;
rev->data = c;
wev->data = c;
wev->write = 1;
return c;
}
void
ngx_free_connection(ngx_connection_t *c)
{
/* ngx_mutex_lock */
c->data = ngx_cycle->free_connections;
ngx_cycle->free_connections = c;
ngx_cycle->free_connection_n++;
/* ngx_mutex_unlock */
if (ngx_cycle->files) {
ngx_cycle->files[c->fd] = NULL;
}
}
void
ngx_close_connection(ngx_connection_t *c)
{
ngx_socket_t fd;
if (c->fd == -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0, "connection already closed");
return;
}
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
if (c->write->timer_set) {
ngx_del_timer(c->write);
}
if (ngx_del_conn) {
ngx_del_conn(c, NGX_CLOSE_EVENT);
} else {
if (c->read->active || c->read->disabled) {
ngx_del_event(c->read, NGX_READ_EVENT, NGX_CLOSE_EVENT);
}
if (c->write->active || c->write->disabled) {
ngx_del_event(c->write, NGX_WRITE_EVENT, NGX_CLOSE_EVENT);
}
}
#if (NGX_THREADS)
/*
* we have to clean the connection information before the closing
* because another thread may reopen the same file descriptor
* before we clean the connection
*/
ngx_mutex_lock(ngx_posted_events_mutex);
if (c->read->prev) {
ngx_delete_posted_event(c->read);
}
if (c->write->prev) {
ngx_delete_posted_event(c->write);
}
c->read->closed = 1;
c->write->closed = 1;
if (c->single_connection) {
ngx_unlock(&c->lock);
c->read->locked = 0;
c->write->locked = 0;
}
ngx_mutex_unlock(ngx_posted_events_mutex);
#else
if (c->read->prev) {
ngx_delete_posted_event(c->read);
}
if (c->write->prev) {
ngx_delete_posted_event(c->write);
}
c->read->closed = 1;
c->write->closed = 1;
#endif
ngx_free_connection(c);
fd = c->fd;
c->fd = (ngx_socket_t) -1;
if (ngx_close_socket(fd) == -1) {
/* we use ngx_cycle->log because c->log was in c->pool */
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
}
ngx_int_t
ngx_connection_error(ngx_connection_t *c, ngx_err_t err, char *text)
{
ngx_uint_t level;
if (err == NGX_ECONNRESET
&& c->log_error == NGX_ERROR_IGNORE_ECONNRESET)
{
return 0;
}
if (err == 0
|| err == NGX_ECONNRESET
#if !(NGX_WIN32)
|| err == NGX_EPIPE
#endif
|| err == NGX_ENOTCONN
|| err == NGX_ETIMEDOUT
|| err == NGX_ECONNREFUSED
|| err == NGX_EHOSTUNREACH)
{
switch (c->log_error) {
case NGX_ERROR_IGNORE_ECONNRESET:
case NGX_ERROR_INFO:
level = NGX_LOG_INFO;
break;
case NGX_ERROR_ERR:
level = NGX_LOG_ERR;
break;
default:
level = NGX_LOG_CRIT;
}
} else {
level = NGX_LOG_CRIT;
}
ngx_log_error(level, c->log, err, text);
return NGX_ERROR;
}
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