mirror of
https://github.com/nginx/nginx.git
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ceb992921c
*) Feature: the IMAP/POP3 proxy supports SSL.
*) Feature: the "proxy_timeout" directive of the ngx_imap_proxy_module.
*) Feature: the "userid_mark" directive.
*) Feature: the $remote_user variable value is determined independently
of authorization use.
406 lines
9.1 KiB
C
406 lines
9.1 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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#include <ngx_event_connect.h>
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#define NGX_RESOLVER_BUFSIZE 8192
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ngx_int_t
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ngx_event_connect_peer(ngx_peer_connection_t *pc)
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{
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int rc;
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ngx_uint_t instance;
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u_int event;
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time_t now;
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ngx_err_t err;
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ngx_peer_t *peer;
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ngx_socket_t s;
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ngx_event_t *rev, *wev;
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ngx_connection_t *c;
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ngx_event_conf_t *ecf;
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now = ngx_time();
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/* ngx_lock_mutex(pc->peers->mutex); */
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if (pc->peers->last_cached) {
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/* cached connection */
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c = pc->peers->cached[pc->peers->last_cached];
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pc->peers->last_cached--;
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/* ngx_unlock_mutex(pc->peers->mutex); */
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#if (NGX_THREADS)
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c->read->lock = c->read->own_lock;
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c->write->lock = c->write->own_lock;
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#endif
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pc->connection = c;
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pc->cached = 1;
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return NGX_OK;
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}
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pc->cached = 0;
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pc->connection = NULL;
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if (pc->peers->number == 1) {
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peer = &pc->peers->peer[0];
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} else {
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/* there are several peers */
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if (pc->tries == pc->peers->number) {
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/* it's a first try - get a current peer */
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pc->cur_peer = pc->peers->current;
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pc->peers->weight--;
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if (pc->peers->weight == 0) {
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pc->peers->current++;
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}
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if (pc->peers->current >= pc->peers->number) {
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pc->peers->current = 0;
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}
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if (pc->peers->weight == 0) {
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pc->peers->weight = pc->peers->peer[pc->peers->current].weight;
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}
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}
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for ( ;; ) {
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peer = &pc->peers->peer[pc->cur_peer];
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if (peer->fails <= peer->max_fails) {
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break;
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}
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if (now - peer->accessed > peer->fail_timeout) {
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peer->fails = 0;
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break;
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}
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pc->cur_peer++;
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if (pc->cur_peer >= pc->peers->number) {
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pc->cur_peer = 0;
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}
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pc->tries--;
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if (pc->tries == 0) {
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/* ngx_unlock_mutex(pc->peers->mutex); */
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return NGX_ERROR;
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}
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}
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}
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/* ngx_unlock_mutex(pc->peers->mutex); */
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s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0);
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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"socket %d", s);
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if (s == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_socket_n " failed");
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return NGX_ERROR;
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}
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ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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/* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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if ((ngx_uint_t) s >= ecf->connections) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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"socket() returned socket #%d while only %d "
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"connections was configured, closing the socket",
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s, ecf->connections);
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if (ngx_close_socket(s) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_close_socket_n "failed");
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}
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/* TODO: sleep for some time */
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return NGX_ERROR;
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}
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if (pc->rcvbuf) {
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if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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(const void *) &pc->rcvbuf, sizeof(int)) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(SO_RCVBUF) failed");
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if (ngx_close_socket(s) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_close_socket_n " failed");
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}
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return NGX_ERROR;
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}
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}
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if (ngx_nonblocking(s) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_nonblocking_n " failed");
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if (ngx_close_socket(s) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_close_socket_n " failed");
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}
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return NGX_ERROR;
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}
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#if (NGX_WIN32)
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/*
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* Winsock assignes a socket number divisible by 4
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* so to find a connection we divide a socket number by 4.
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*/
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if (s % 4) {
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ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
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ngx_socket_n
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" created socket %d, not divisible by 4", s);
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exit(1);
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}
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c = &ngx_cycle->connections[s / 4];
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rev = &ngx_cycle->read_events[s / 4];
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wev = &ngx_cycle->write_events[s / 4];
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#else
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c = &ngx_cycle->connections[s];
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rev = &ngx_cycle->read_events[s];
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wev = &ngx_cycle->write_events[s];
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#endif
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instance = rev->instance;
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#if (NGX_THREADS)
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if (*(&c->lock)) {
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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"spinlock in connect, fd:%d", s);
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ngx_spinlock(&c->lock, 1000);
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ngx_unlock(&c->lock);
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}
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#endif
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ngx_memzero(c, sizeof(ngx_connection_t));
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ngx_memzero(rev, sizeof(ngx_event_t));
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ngx_memzero(wev, sizeof(ngx_event_t));
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rev->instance = !instance;
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wev->instance = !instance;
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rev->index = NGX_INVALID_INDEX;
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wev->index = NGX_INVALID_INDEX;
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rev->data = c;
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wev->data = c;
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c->read = rev;
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c->write = wev;
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wev->write = 1;
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c->recv = ngx_recv;
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c->send = ngx_send;
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c->send_chain = ngx_send_chain;
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c->log = pc->log;
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rev->log = pc->log;
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wev->log = pc->log;
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c->fd = s;
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c->log_error = pc->log_error;
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if (peer->sockaddr->sa_family != AF_INET) {
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c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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}
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pc->connection = c;
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/*
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* TODO: MT: - atomic increment (x86: lock xadd)
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* or protection by critical section or mutex
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*
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* TODO: MP: - allocated in a shared memory
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* - atomic increment (x86: lock xadd)
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* or protection by critical section or mutex
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*/
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c->number = ngx_atomic_inc(ngx_connection_counter);
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#if (NGX_THREADS)
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rev->lock = pc->lock;
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wev->lock = pc->lock;
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rev->own_lock = &c->lock;
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wev->own_lock = &c->lock;
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#endif
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if (ngx_add_conn) {
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if (ngx_add_conn(c) == NGX_ERROR) {
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return NGX_ERROR;
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}
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}
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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"connect to %V, #%d", &peer->name, c->number);
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rc = connect(s, peer->sockaddr, peer->socklen);
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if (rc == -1) {
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err = ngx_socket_errno;
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/* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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ngx_connection_error(c, err, "connect() failed");
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#if 0
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#undef sun
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{
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struct sockaddr_un *sun;
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sun = (struct sockaddr_un *) peer->sockaddr;
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ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
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"\"%s\", f:%d, l:%uz",
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sun->sun_path, sun->sun_family, peer->socklen);
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}
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#endif
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return NGX_CONNECT_ERROR;
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}
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}
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if (ngx_add_conn) {
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if (rc == -1) {
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/* NGX_EINPROGRESS */
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return NGX_AGAIN;
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}
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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wev->ready = 1;
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return NGX_OK;
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}
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if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno,
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"connect(): %d", rc);
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/* aio, iocp */
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if (ngx_blocking(s) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_blocking_n " failed");
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return NGX_ERROR;
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}
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/*
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* FreeBSD's aio allows to post an operation on non-connected socket.
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* NT does not support it.
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*
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* TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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*/
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rev->ready = 1;
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wev->ready = 1;
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return NGX_OK;
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}
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if (ngx_event_flags & NGX_USE_CLEAR_EVENT) {
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/* kqueue */
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event = NGX_CLEAR_EVENT;
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} else {
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/* select, poll, /dev/poll */
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event = NGX_LEVEL_EVENT;
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}
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if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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return NGX_ERROR;
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}
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if (rc == -1) {
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/* NGX_EINPROGRESS */
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if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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return NGX_ERROR;
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}
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return NGX_AGAIN;
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}
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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wev->ready = 1;
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return NGX_OK;
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}
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void
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ngx_event_connect_peer_failed(ngx_peer_connection_t *pc, ngx_uint_t down)
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{
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time_t now;
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if (down) {
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now = ngx_time();
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/* ngx_lock_mutex(pc->peers->mutex); */
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pc->peers->peer[pc->cur_peer].fails++;
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pc->peers->peer[pc->cur_peer].accessed = now;
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/* ngx_unlock_mutex(pc->peers->mutex); */
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}
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pc->cur_peer++;
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if (pc->cur_peer >= pc->peers->number) {
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pc->cur_peer = 0;
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}
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pc->tries--;
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}
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