| |
| /* |
| * Copyright (C) Roman Arutyunyan |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| |
| |
| #if !(NGX_WIN32) |
| |
| static void ngx_close_accepted_udp_connection(ngx_connection_t *c); |
| |
| |
| void |
| ngx_event_recvmsg(ngx_event_t *ev) |
| { |
| ssize_t n; |
| ngx_log_t *log; |
| ngx_err_t err; |
| socklen_t socklen, local_socklen; |
| ngx_event_t *rev, *wev; |
| struct iovec iov[1]; |
| struct msghdr msg; |
| ngx_sockaddr_t sa, lsa; |
| struct sockaddr *sockaddr, *local_sockaddr; |
| 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_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 |
| |
| sockaddr = msg.msg_name; |
| socklen = msg.msg_namelen; |
| |
| if (socklen > (socklen_t) sizeof(ngx_sockaddr_t)) { |
| socklen = sizeof(ngx_sockaddr_t); |
| } |
| |
| if (socklen == 0) { |
| |
| /* |
| * on Linux recvmsg() returns zero msg_namelen |
| * when receiving packets from unbound AF_UNIX sockets |
| */ |
| |
| socklen = sizeof(struct sockaddr); |
| ngx_memzero(&sa, sizeof(struct sockaddr)); |
| sa.sockaddr.sa_family = ls->sockaddr->sa_family; |
| } |
| |
| local_sockaddr = ls->sockaddr; |
| local_socklen = ls->socklen; |
| |
| #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
| |
| if (ls->wildcard) { |
| struct cmsghdr *cmsg; |
| |
| ngx_memcpy(&lsa, local_sockaddr, local_socklen); |
| local_sockaddr = &lsa.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 |
| && local_sockaddr->sa_family == AF_INET) |
| { |
| struct in_addr *addr; |
| struct sockaddr_in *sin; |
| |
| addr = (struct in_addr *) CMSG_DATA(cmsg); |
| sin = (struct sockaddr_in *) local_sockaddr; |
| sin->sin_addr = *addr; |
| |
| break; |
| } |
| |
| #elif (NGX_HAVE_IP_PKTINFO) |
| |
| if (cmsg->cmsg_level == IPPROTO_IP |
| && cmsg->cmsg_type == IP_PKTINFO |
| && local_sockaddr->sa_family == AF_INET) |
| { |
| struct in_pktinfo *pkt; |
| struct sockaddr_in *sin; |
| |
| pkt = (struct in_pktinfo *) CMSG_DATA(cmsg); |
| sin = (struct sockaddr_in *) local_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 |
| && local_sockaddr->sa_family == AF_INET6) |
| { |
| struct in6_pktinfo *pkt6; |
| struct sockaddr_in6 *sin6; |
| |
| pkt6 = (struct in6_pktinfo *) CMSG_DATA(cmsg); |
| sin6 = (struct sockaddr_in6 *) local_sockaddr; |
| sin6->sin6_addr = pkt6->ipi6_addr; |
| |
| break; |
| } |
| |
| #endif |
| |
| } |
| } |
| |
| #endif |
| |
| #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(lc->fd, ev->log); |
| if (c == NULL) { |
| return; |
| } |
| |
| c->shared = 1; |
| c->type = SOCK_DGRAM; |
| c->socklen = socklen; |
| |
| #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_udp_connection(c); |
| return; |
| } |
| |
| c->sockaddr = ngx_palloc(c->pool, socklen); |
| if (c->sockaddr == NULL) { |
| ngx_close_accepted_udp_connection(c); |
| return; |
| } |
| |
| ngx_memcpy(c->sockaddr, sockaddr, socklen); |
| |
| log = ngx_palloc(c->pool, sizeof(ngx_log_t)); |
| if (log == NULL) { |
| ngx_close_accepted_udp_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; |
| |
| if (local_sockaddr == &lsa.sockaddr) { |
| local_sockaddr = ngx_palloc(c->pool, local_socklen); |
| if (local_sockaddr == NULL) { |
| ngx_close_accepted_udp_connection(c); |
| return; |
| } |
| |
| ngx_memcpy(local_sockaddr, &lsa, local_socklen); |
| } |
| |
| c->local_sockaddr = local_sockaddr; |
| c->local_socklen = local_socklen; |
| |
| c->buffer = ngx_create_temp_buf(c->pool, n); |
| if (c->buffer == NULL) { |
| ngx_close_accepted_udp_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_udp_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_udp_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); |
| } |
| |
| |
| static void |
| ngx_close_accepted_udp_connection(ngx_connection_t *c) |
| { |
| ngx_free_connection(c); |
| |
| c->fd = (ngx_socket_t) -1; |
| |
| if (c->pool) { |
| ngx_destroy_pool(c->pool); |
| } |
| |
| #if (NGX_STAT_STUB) |
| (void) ngx_atomic_fetch_add(ngx_stat_active, -1); |
| #endif |
| } |
| |
| #endif |