Mercurial > hg > nginx
view src/event/ngx_event_accept.c @ 6034:3e847964ab55
SSL: clear protocol options.
LibreSSL 2.1.1+ started to set SSL_OP_NO_SSLv3 option by default on
new contexts. This makes sure to clear it to make it possible to use SSLv3
with LibreSSL if enabled in nginx config.
Prodded by Kuramoto Eiji.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 23 Mar 2015 02:42:32 +0300 |
parents | 3377f9459e99 |
children | 4dc8e7b62216 |
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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 == (ngx_socket_t) -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->local_socklen = ls->socklen; 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 (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) { ngx_str_t addr; struct sockaddr_in *sin; ngx_cidr_t *cidr; ngx_uint_t i; u_char text[NGX_SOCKADDR_STRLEN]; #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 != (ngx_uint_t) 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; } if (log->log_level & NGX_LOG_DEBUG_EVENT) { addr.data = text; addr.len = ngx_sock_ntop(c->sockaddr, c->socklen, text, NGX_SOCKADDR_STRLEN, 1); ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0, "*%uA accept: %V fd:%d", c->number, &addr, s); } } #endif 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); }