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410
src/event/ngx_event_connect.c
Normal file
410
src/event/ngx_event_connect.c
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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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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#if (NGX_HAVE_TRANSPARENT_PROXY)
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static ngx_int_t ngx_event_connect_set_transparent(ngx_peer_connection_t *pc,
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ngx_socket_t s);
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#endif
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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, type;
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#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT || NGX_LINUX)
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in_port_t port;
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#endif
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ngx_int_t event;
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ngx_err_t err;
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ngx_uint_t level;
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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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rc = pc->get(pc, pc->data);
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if (rc != NGX_OK) {
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return rc;
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}
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type = (pc->type ? pc->type : SOCK_STREAM);
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s = ngx_socket(pc->sockaddr->sa_family, type, 0);
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0, "%s socket %d",
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(type == SOCK_STREAM) ? "stream" : "dgram", s);
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if (s == (ngx_socket_t) -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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c = ngx_get_connection(s, pc->log);
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if (c == NULL) {
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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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c->type = type;
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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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{
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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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goto failed;
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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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goto failed;
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}
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if (pc->local) {
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#if (NGX_HAVE_TRANSPARENT_PROXY)
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if (pc->transparent) {
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if (ngx_event_connect_set_transparent(pc, s) != NGX_OK) {
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goto failed;
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}
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}
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#endif
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#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT || NGX_LINUX)
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port = ngx_inet_get_port(pc->local->sockaddr);
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#endif
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#if (NGX_HAVE_IP_BIND_ADDRESS_NO_PORT)
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if (pc->sockaddr->sa_family != AF_UNIX && port == 0) {
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static int bind_address_no_port = 1;
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if (bind_address_no_port) {
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if (setsockopt(s, IPPROTO_IP, IP_BIND_ADDRESS_NO_PORT,
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(const void *) &bind_address_no_port,
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sizeof(int)) == -1)
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{
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err = ngx_socket_errno;
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if (err != NGX_EOPNOTSUPP && err != NGX_ENOPROTOOPT) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, err,
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"setsockopt(IP_BIND_ADDRESS_NO_PORT) "
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"failed, ignored");
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} else {
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bind_address_no_port = 0;
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}
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}
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}
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}
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#endif
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#if (NGX_LINUX)
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if (pc->type == SOCK_DGRAM && port != 0) {
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int reuse_addr = 1;
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if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
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(const void *) &reuse_addr, sizeof(int))
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== -1)
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{
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(SO_REUSEADDR) failed");
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goto failed;
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}
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}
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#endif
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if (bind(s, pc->local->sockaddr, pc->local->socklen) == -1) {
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ngx_log_error(NGX_LOG_CRIT, pc->log, ngx_socket_errno,
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"bind(%V) failed", &pc->local->name);
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goto failed;
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}
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}
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if (type == SOCK_STREAM) {
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c->recv = ngx_recv;
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c->send = ngx_send;
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c->recv_chain = ngx_recv_chain;
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c->send_chain = ngx_send_chain;
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c->sendfile = 1;
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if (pc->sockaddr->sa_family == AF_UNIX) {
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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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#if (NGX_SOLARIS)
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/* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
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c->sendfile = 0;
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#endif
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}
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} else { /* type == SOCK_DGRAM */
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c->recv = ngx_udp_recv;
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c->send = ngx_send;
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c->send_chain = ngx_udp_send_chain;
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}
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c->log_error = pc->log_error;
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rev = c->read;
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wev = c->write;
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rev->log = pc->log;
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wev->log = pc->log;
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pc->connection = c;
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c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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if (ngx_add_conn) {
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if (ngx_add_conn(c) == NGX_ERROR) {
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goto failed;
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}
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}
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ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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"connect to %V, fd:%d #%uA", pc->name, s, c->number);
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rc = connect(s, pc->sockaddr, pc->socklen);
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if (rc == -1) {
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err = ngx_socket_errno;
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if (err != NGX_EINPROGRESS
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#if (NGX_WIN32)
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/* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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&& err != NGX_EAGAIN
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#endif
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)
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{
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if (err == NGX_ECONNREFUSED
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#if (NGX_LINUX)
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/*
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* Linux returns EAGAIN instead of ECONNREFUSED
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* for unix sockets if listen queue is full
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*/
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|| err == NGX_EAGAIN
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#endif
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|| err == NGX_ECONNRESET
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|| err == NGX_ENETDOWN
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|| err == NGX_ENETUNREACH
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|| err == NGX_EHOSTDOWN
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|| err == NGX_EHOSTUNREACH)
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{
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level = NGX_LOG_ERR;
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} else {
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level = NGX_LOG_CRIT;
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}
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ngx_log_error(level, c->log, err, "connect() to %V failed",
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pc->name);
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ngx_close_connection(c);
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pc->connection = NULL;
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return NGX_DECLINED;
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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_IOCP_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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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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goto failed;
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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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goto failed;
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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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goto failed;
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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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failed:
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ngx_close_connection(c);
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pc->connection = NULL;
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return NGX_ERROR;
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}
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#if (NGX_HAVE_TRANSPARENT_PROXY)
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static ngx_int_t
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ngx_event_connect_set_transparent(ngx_peer_connection_t *pc, ngx_socket_t s)
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{
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int value;
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value = 1;
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#if defined(SO_BINDANY)
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if (setsockopt(s, SOL_SOCKET, SO_BINDANY,
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(const void *) &value, sizeof(int)) == -1)
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{
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(SO_BINDANY) failed");
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return NGX_ERROR;
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}
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#else
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switch (pc->local->sockaddr->sa_family) {
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case AF_INET:
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#if defined(IP_TRANSPARENT)
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if (setsockopt(s, IPPROTO_IP, IP_TRANSPARENT,
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(const void *) &value, sizeof(int)) == -1)
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{
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(IP_TRANSPARENT) failed");
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return NGX_ERROR;
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}
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#elif defined(IP_BINDANY)
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if (setsockopt(s, IPPROTO_IP, IP_BINDANY,
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(const void *) &value, sizeof(int)) == -1)
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{
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(IP_BINDANY) failed");
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return NGX_ERROR;
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}
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#endif
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break;
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#if (NGX_HAVE_INET6)
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case AF_INET6:
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#if defined(IPV6_TRANSPARENT)
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if (setsockopt(s, IPPROTO_IPV6, IPV6_TRANSPARENT,
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(const void *) &value, sizeof(int)) == -1)
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{
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(IPV6_TRANSPARENT) failed");
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return NGX_ERROR;
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}
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#elif defined(IPV6_BINDANY)
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if (setsockopt(s, IPPROTO_IPV6, IPV6_BINDANY,
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(const void *) &value, sizeof(int)) == -1)
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{
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(IPV6_BINDANY) failed");
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return NGX_ERROR;
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}
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#endif
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break;
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#endif /* NGX_HAVE_INET6 */
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}
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#endif /* SO_BINDANY */
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return NGX_OK;
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}
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#endif
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ngx_int_t
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ngx_event_get_peer(ngx_peer_connection_t *pc, void *data)
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{
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return NGX_OK;
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}
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