diff options
Diffstat (limited to 'app/nginx/src/event/ngx_event_accept.c')
| -rw-r--r-- | app/nginx/src/event/ngx_event_accept.c | 832 |
1 files changed, 832 insertions, 0 deletions
diff --git a/app/nginx/src/event/ngx_event_accept.c b/app/nginx/src/event/ngx_event_accept.c new file mode 100644 index 0000000..1fce2e8 --- /dev/null +++ b/app/nginx/src/event/ngx_event_accept.c @@ -0,0 +1,832 @@ + +/* + * 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, ngx_uint_t all); +static void ngx_close_accepted_connection(ngx_connection_t *c); +#if (NGX_DEBUG) +static void ngx_debug_accepted_connection(ngx_event_conf_t *ecf, + ngx_connection_t *c); +#endif + + +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_sockaddr_t sa; + ngx_listening_t *ls; + ngx_connection_t *c, *lc; + ngx_event_conf_t *ecf; +#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_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 = sizeof(ngx_sockaddr_t); + +#if (NGX_HAVE_ACCEPT4) + if (use_accept4) { + s = accept4(lc->fd, &sa.sockaddr, &socklen, SOCK_NONBLOCK); + } else { + s = accept(lc->fd, &sa.sockaddr, &socklen); + } +#else + s = accept(lc->fd, &sa.sockaddr, &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, 1) + != 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; + } + + c->type = SOCK_STREAM; + +#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 iocp and non-blocking mode for others */ + + if (ngx_inherited_nonblocking) { + if (ngx_event_flags & NGX_USE_IOCP_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_IOCP_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; + +#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_IOCP_EVENT) { + 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; + u_char text[NGX_SOCKADDR_STRLEN]; + + ngx_debug_accepted_connection(ecf, c); + + 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); +} + + +#if !(NGX_WIN32) + +void +ngx_event_recvmsg(ngx_event_t *ev) +{ + ssize_t n; + ngx_log_t *log; + ngx_err_t err; + ngx_event_t *rev, *wev; + struct iovec iov[1]; + struct msghdr msg; + ngx_sockaddr_t sa; + ngx_listening_t *ls; + ngx_event_conf_t *ecf; + ngx_connection_t *c, *lc; + static u_char buffer[65535]; + +#if (NGX_HAVE_MSGHDR_MSG_CONTROL) + +#if (NGX_HAVE_IP_RECVDSTADDR) + u_char msg_control[CMSG_SPACE(sizeof(struct in_addr))]; +#elif (NGX_HAVE_IP_PKTINFO) + u_char msg_control[CMSG_SPACE(sizeof(struct in_pktinfo))]; +#endif + +#if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) + u_char msg_control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; +#endif + +#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_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, + "recvmsg on %V, ready: %d", &ls->addr_text, ev->available); + + do { + ngx_memzero(&msg, sizeof(struct msghdr)); + + iov[0].iov_base = (void *) buffer; + iov[0].iov_len = sizeof(buffer); + + msg.msg_name = &sa; + msg.msg_namelen = sizeof(ngx_sockaddr_t); + msg.msg_iov = iov; + msg.msg_iovlen = 1; + +#if (NGX_HAVE_MSGHDR_MSG_CONTROL) + + if (ls->wildcard) { + +#if (NGX_HAVE_IP_RECVDSTADDR || NGX_HAVE_IP_PKTINFO) + if (ls->sockaddr->sa_family == AF_INET) { + msg.msg_control = &msg_control; + msg.msg_controllen = sizeof(msg_control); + } +#endif + +#if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) + if (ls->sockaddr->sa_family == AF_INET6) { + msg.msg_control = &msg_control6; + msg.msg_controllen = sizeof(msg_control6); + } +#endif + } + +#endif + + n = recvmsg(lc->fd, &msg, 0); + + if (n == -1) { + err = ngx_socket_errno; + + if (err == NGX_EAGAIN) { + ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err, + "recvmsg() not ready"); + return; + } + + ngx_log_error(NGX_LOG_ALERT, ev->log, err, "recvmsg() failed"); + + return; + } + +#if (NGX_STAT_STUB) + (void) ngx_atomic_fetch_add(ngx_stat_accepted, 1); +#endif + +#if (NGX_HAVE_MSGHDR_MSG_CONTROL) + if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) { + ngx_log_error(NGX_LOG_ALERT, ev->log, 0, + "recvmsg() truncated data"); + continue; + } +#endif + + ngx_accept_disabled = ngx_cycle->connection_n / 8 + - ngx_cycle->free_connection_n; + + c = ngx_get_connection(lc->fd, ev->log); + if (c == NULL) { + return; + } + + c->shared = 1; + c->type = SOCK_DGRAM; + c->socklen = msg.msg_namelen; + +#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, c->socklen); + if (c->sockaddr == NULL) { + ngx_close_accepted_connection(c); + return; + } + + ngx_memcpy(c->sockaddr, msg.msg_name, c->socklen); + + log = ngx_palloc(c->pool, sizeof(ngx_log_t)); + if (log == NULL) { + ngx_close_accepted_connection(c); + return; + } + + *log = ls->log; + + c->send = ngx_udp_send; + c->send_chain = ngx_udp_send_chain; + + c->log = log; + c->pool->log = log; + + c->listening = ls; + c->local_sockaddr = ls->sockaddr; + c->local_socklen = ls->socklen; + +#if (NGX_HAVE_MSGHDR_MSG_CONTROL) + + if (ls->wildcard) { + struct cmsghdr *cmsg; + struct sockaddr *sockaddr; + + sockaddr = ngx_palloc(c->pool, c->local_socklen); + if (sockaddr == NULL) { + ngx_close_accepted_connection(c); + return; + } + + ngx_memcpy(sockaddr, c->local_sockaddr, c->local_socklen); + c->local_sockaddr = sockaddr; + + for (cmsg = CMSG_FIRSTHDR(&msg); + cmsg != NULL; + cmsg = CMSG_NXTHDR(&msg, cmsg)) + { + +#if (NGX_HAVE_IP_RECVDSTADDR) + + if (cmsg->cmsg_level == IPPROTO_IP + && cmsg->cmsg_type == IP_RECVDSTADDR + && sockaddr->sa_family == AF_INET) + { + struct in_addr *addr; + struct sockaddr_in *sin; + + addr = (struct in_addr *) CMSG_DATA(cmsg); + sin = (struct sockaddr_in *) sockaddr; + sin->sin_addr = *addr; + + break; + } + +#elif (NGX_HAVE_IP_PKTINFO) + + if (cmsg->cmsg_level == IPPROTO_IP + && cmsg->cmsg_type == IP_PKTINFO + && sockaddr->sa_family == AF_INET) + { + struct in_pktinfo *pkt; + struct sockaddr_in *sin; + + pkt = (struct in_pktinfo *) CMSG_DATA(cmsg); + sin = (struct sockaddr_in *) sockaddr; + sin->sin_addr = pkt->ipi_addr; + + break; + } + +#endif + +#if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) + + if (cmsg->cmsg_level == IPPROTO_IPV6 + && cmsg->cmsg_type == IPV6_PKTINFO + && sockaddr->sa_family == AF_INET6) + { + struct in6_pktinfo *pkt6; + struct sockaddr_in6 *sin6; + + pkt6 = (struct in6_pktinfo *) CMSG_DATA(cmsg); + sin6 = (struct sockaddr_in6 *) sockaddr; + sin6->sin6_addr = pkt6->ipi6_addr; + + break; + } + +#endif + + } + } + +#endif + + c->buffer = ngx_create_temp_buf(c->pool, n); + if (c->buffer == NULL) { + ngx_close_accepted_connection(c); + return; + } + + c->buffer->last = ngx_cpymem(c->buffer->last, buffer, n); + + rev = c->read; + wev = c->write; + + wev->ready = 1; + + 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; + u_char text[NGX_SOCKADDR_STRLEN]; + + ngx_debug_accepted_connection(ecf, c); + + 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_debug4(NGX_LOG_DEBUG_EVENT, log, 0, + "*%uA recvmsg: %V fd:%d n:%z", + c->number, &addr, c->fd, n); + } + + } +#endif + + log->data = NULL; + log->handler = NULL; + + ls->handler(c); + + if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { + ev->available -= n; + } + + } while (ev->available); +} + +#endif + + +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) { + 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, 0) == 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 == NULL || c->read->active) { + continue; + } + + 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 all) +{ + 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 == NULL || !c->read->active) { + continue; + } + +#if (NGX_HAVE_REUSEPORT) + + /* + * do not disable accept on worker's own sockets + * when disabling accept events due to accept mutex + */ + + if (ls[i].reuseport && !all) { + continue; + } + +#endif + + 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 (!c->shared && 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); +} + + +#if (NGX_DEBUG) + +static void +ngx_debug_accepted_connection(ngx_event_conf_t *ecf, ngx_connection_t *c) +{ + 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 != (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; + } + + c->log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL; + break; + + next: + continue; + } +} + +#endif |