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af18946d76
nginx/src/event/ngx_event_accept.c
Vladimir Homutov af18946d76 Core: extended ngx_sock_ntop() with socklen parameter. 
On Linux, sockaddr length is required to process unix socket addresses properly
due to unnamed sockets (which don't have sun_path set at all) and abstract
namespace sockets.
2013-07-11 16:07:25 +04:00

507 lines
13 KiB
C
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
static ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle);
static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle);
static void ngx_close_accepted_connection(ngx_connection_t *c);
void
ngx_event_accept(ngx_event_t *ev)
{
socklen_t socklen;
ngx_err_t err;
ngx_log_t *log;
ngx_uint_t level;
ngx_socket_t s;
ngx_event_t *rev, *wev;
ngx_listening_t *ls;
ngx_connection_t *c, *lc;
ngx_event_conf_t *ecf;
u_char sa[NGX_SOCKADDRLEN];
#if (NGX_HAVE_ACCEPT4)
static ngx_uint_t use_accept4 = 1;
#endif
if (ev->timedout) {
if (ngx_enable_accept_events((ngx_cycle_t *) ngx_cycle) != NGX_OK) {
return;
}
ev->timedout = 0;
}
ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
ev->available = 1;
} else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
ev->available = ecf->multi_accept;
}
lc = ev->data;
ls = lc->listening;
ev->ready = 0;
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"accept on %V, ready: %d", &ls->addr_text, ev->available);
do {
socklen = NGX_SOCKADDRLEN;
#if (NGX_HAVE_ACCEPT4)
if (use_accept4) {
s = accept4(lc->fd, (struct sockaddr *) sa, &socklen,
SOCK_NONBLOCK);
} else {
s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
}
#else
s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
#endif
if (s == -1) {
err = ngx_socket_errno;
if (err == NGX_EAGAIN) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
"accept() not ready");
return;
}
level = NGX_LOG_ALERT;
if (err == NGX_ECONNABORTED) {
level = NGX_LOG_ERR;
} else if (err == NGX_EMFILE || err == NGX_ENFILE) {
level = NGX_LOG_CRIT;
}
#if (NGX_HAVE_ACCEPT4)
ngx_log_error(level, ev->log, err,
use_accept4 ? "accept4() failed" : "accept() failed");
if (use_accept4 && err == NGX_ENOSYS) {
use_accept4 = 0;
ngx_inherited_nonblocking = 0;
continue;
}
#else
ngx_log_error(level, ev->log, err, "accept() failed");
#endif
if (err == NGX_ECONNABORTED) {
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
ev->available--;
}
if (ev->available) {
continue;
}
}
if (err == NGX_EMFILE || err == NGX_ENFILE) {
if (ngx_disable_accept_events((ngx_cycle_t *) ngx_cycle)
!= NGX_OK)
{
return;
}
if (ngx_use_accept_mutex) {
if (ngx_accept_mutex_held) {
ngx_shmtx_unlock(&ngx_accept_mutex);
ngx_accept_mutex_held = 0;
}
ngx_accept_disabled = 1;
} else {
ngx_add_timer(ev, ecf->accept_mutex_delay);
}
}
return;
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_accepted, 1);
#endif
ngx_accept_disabled = ngx_cycle->connection_n / 8
- ngx_cycle->free_connection_n;
c = ngx_get_connection(s, ev->log);
if (c == NULL) {
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
return;
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, 1);
#endif
c->pool = ngx_create_pool(ls->pool_size, ev->log);
if (c->pool == NULL) {
ngx_close_accepted_connection(c);
return;
}
c->sockaddr = ngx_palloc(c->pool, socklen);
if (c->sockaddr == NULL) {
ngx_close_accepted_connection(c);
return;
}
ngx_memcpy(c->sockaddr, sa, socklen);
log = ngx_palloc(c->pool, sizeof(ngx_log_t));
if (log == NULL) {
ngx_close_accepted_connection(c);
return;
}
/* set a blocking mode for aio and non-blocking mode for others */
if (ngx_inherited_nonblocking) {
if (ngx_event_flags & NGX_USE_AIO_EVENT) {
if (ngx_blocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
ngx_blocking_n " failed");
ngx_close_accepted_connection(c);
return;
}
}
} else {
if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
ngx_nonblocking_n " failed");
ngx_close_accepted_connection(c);
return;
}
}
}
*log = ls->log;
c->recv = ngx_recv;
c->send = ngx_send;
c->recv_chain = ngx_recv_chain;
c->send_chain = ngx_send_chain;
c->log = log;
c->pool->log = log;
c->socklen = socklen;
c->listening = ls;
c->local_sockaddr = ls->sockaddr;
c->unexpected_eof = 1;
#if (NGX_HAVE_UNIX_DOMAIN)
if (c->sockaddr->sa_family == AF_UNIX) {
c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
#if (NGX_SOLARIS)
/* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
c->sendfile = 0;
#endif
}
#endif
rev = c->read;
wev = c->write;
wev->ready = 1;
if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
/* rtsig, aio, iocp */
rev->ready = 1;
}
if (ev->deferred_accept) {
rev->ready = 1;
#if (NGX_HAVE_KQUEUE)
rev->available = 1;
#endif
}
rev->log = log;
wev->log = log;
/*
* TODO: MT: - ngx_atomic_fetch_add()
* or protection by critical section or light mutex
*
* TODO: MP: - allocated in a shared memory
* - ngx_atomic_fetch_add()
* or protection by critical section or light mutex
*/
c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_handled, 1);
#endif
#if (NGX_THREADS)
rev->lock = &c->lock;
wev->lock = &c->lock;
rev->own_lock = &c->lock;
wev->own_lock = &c->lock;
#endif
if (ls->addr_ntop) {
c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
if (c->addr_text.data == NULL) {
ngx_close_accepted_connection(c);
return;
}
c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->socklen,
c->addr_text.data,
ls->addr_text_max_len, 0);
if (c->addr_text.len == 0) {
ngx_close_accepted_connection(c);
return;
}
}
#if (NGX_DEBUG)
{
struct sockaddr_in *sin;
ngx_cidr_t *cidr;
ngx_uint_t i;
#if (NGX_HAVE_INET6)
struct sockaddr_in6 *sin6;
ngx_uint_t n;
#endif
cidr = ecf->debug_connection.elts;
for (i = 0; i < ecf->debug_connection.nelts; i++) {
if (cidr[i].family != c->sockaddr->sa_family) {
goto next;
}
switch (cidr[i].family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) c->sockaddr;
for (n = 0; n < 16; n++) {
if ((sin6->sin6_addr.s6_addr[n]
& cidr[i].u.in6.mask.s6_addr[n])
!= cidr[i].u.in6.addr.s6_addr[n])
{
goto next;
}
}
break;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
case AF_UNIX:
break;
#endif
default: /* AF_INET */
sin = (struct sockaddr_in *) c->sockaddr;
if ((sin->sin_addr.s_addr & cidr[i].u.in.mask)
!= cidr[i].u.in.addr)
{
goto next;
}
break;
}
log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
break;
next:
continue;
}
}
#endif
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
"*%d accept: %V fd:%d", c->number, &c->addr_text, s);
if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
if (ngx_add_conn(c) == NGX_ERROR) {
ngx_close_accepted_connection(c);
return;
}
}
log->data = NULL;
log->handler = NULL;
ls->handler(c);
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
ev->available--;
}
} while (ev->available);
}
ngx_int_t
ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
{
if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"accept mutex locked");
if (ngx_accept_mutex_held
&& ngx_accept_events == 0
&& !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
{
return NGX_OK;
}
if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
ngx_shmtx_unlock(&ngx_accept_mutex);
return NGX_ERROR;
}
ngx_accept_events = 0;
ngx_accept_mutex_held = 1;
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"accept mutex lock failed: %ui", ngx_accept_mutex_held);
if (ngx_accept_mutex_held) {
if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
return NGX_ERROR;
}
ngx_accept_mutex_held = 0;
}
return NGX_OK;
}
static ngx_int_t
ngx_enable_accept_events(ngx_cycle_t *cycle)
{
ngx_uint_t i;
ngx_listening_t *ls;
ngx_connection_t *c;
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
c = ls[i].connection;
if (c->read->active) {
continue;
}
if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
if (ngx_add_conn(c) == NGX_ERROR) {
return NGX_ERROR;
}
} else {
if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
return NGX_ERROR;
}
}
}
return NGX_OK;
}
static ngx_int_t
ngx_disable_accept_events(ngx_cycle_t *cycle)
{
ngx_uint_t i;
ngx_listening_t *ls;
ngx_connection_t *c;
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
c = ls[i].connection;
if (!c->read->active) {
continue;
}
if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
return NGX_ERROR;
}
} else {
if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
== NGX_ERROR)
{
return NGX_ERROR;
}
}
}
return NGX_OK;
}
static void
ngx_close_accepted_connection(ngx_connection_t *c)
{
ngx_socket_t fd;
ngx_free_connection(c);
fd = c->fd;
c->fd = (ngx_socket_t) -1;
if (ngx_close_socket(fd) == -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
if (c->pool) {
ngx_destroy_pool(c->pool);
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, -1);
#endif
}
u_char *
ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
{
return ngx_snprintf(buf, len, " while accepting new connection on %V",
log->data);
}
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