static int remote_init () { server_socket = socket(AF_INET, SOCK_STREAM, 0); if (server_socket == -1) { perror("\nsocket"); return -1; } struct sockaddr_in server = {0}; server.sin_family = AF_INET; server.sin_addr.s_addr = htonl(INADDR_ANY); server.sin_port = htons(4908); int on = 1; if (setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) != 0){ perror("\nsetsockopt"); return -1; } if (bind(server_socket, (struct sockaddr *) &server, sizeof server) != 0) { perror("\nbind"); return -1; } if (listen(server_socket, 3) != 0) { perror("\nlisten"); return -1; } int flags = fcntl(server_socket, F_GETFL, 0); if (flags == -1) { perror("\nfcntl"); return -1; } flags |= O_NONBLOCK; if (fcntl(server_socket, F_SETFL, flags) != 0) { perror("\nfcntl"); return -1; } register_socket(server_socket, remote_control); return 0; }
/** @brief Processes a WCCP server of a group. * * Check connection to server. Open a new one or close if dead. * Send WCCP hello messages and login to WCCP group. * * @param this_epoller [in] wccp server being processed. */ int wccp_process_server(struct epoller *wccp_epoller, struct wccp_service_group *this_wccp_service_group, struct wccp_server *this_wccp_server){ char message[LOGSZ] = {0}; int client = -1; if(this_wccp_server->sock == 0){ //Need to open a socket to this server. client = new_udp_client(this_wccp_server->ipaddress, WCCP_PORT); if(client >= 0){ this_wccp_server->sock = client; register_socket(client, wccp_epoller->epoll_fd, &wccp_epoller->event); logger2(LOGGING_DEBUG, DEBUG_WCCP,"[WCCP] Connected to server.\n"); } }else{ logger2(LOGGING_DEBUG, DEBUG_WCCP,"[WCCP] Sending WCCP Hello to server.\n"); wccp_send_message(this_wccp_service_group, this_wccp_server, WCCP2_HERE_I_AM); wccp_send_message(this_wccp_service_group, this_wccp_server, WCCP2_REDIRECT_ASSIGN); } return 0; }
int server_main(char *home, char *dev, char *port, int udp, int ipv4, int log) { int lfd = -1, kdpfd, nfds, nfd, curfds, efd[2], refd[2], tunfd, i; unsigned int cpus = 0, threads, udp_cpu = 0; ssize_t ret; struct epoll_event *events; struct addrinfo hints, *ahead, *ai; auth_log = !!log; openlog("curvetun", LOG_PID | LOG_CONS | LOG_NDELAY, LOG_DAEMON); syslog(LOG_INFO, "curvetun server booting!\n"); syslog_maybe(!auth_log, LOG_INFO, "curvetun user logging disabled!\n"); parse_userfile_and_generate_user_store_or_die(home); memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; hints.ai_socktype = udp ? SOCK_DGRAM : SOCK_STREAM; hints.ai_protocol = udp ? IPPROTO_UDP : IPPROTO_TCP; hints.ai_flags = AI_PASSIVE; ret = getaddrinfo(NULL, port, &hints, &ahead); if (ret < 0) syslog_panic("Cannot get address info!\n"); for (ai = ahead; ai != NULL && lfd < 0; ai = ai->ai_next) { lfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); if (lfd < 0) continue; if (ai->ai_family == AF_INET6) { #ifdef IPV6_V6ONLY ret = set_ipv6_only(lfd); if (ret < 0) { close(lfd); lfd = -1; continue; } #else close(lfd); lfd = -1; continue; #endif /* IPV6_V6ONLY */ } set_reuseaddr(lfd); set_mtu_disc_dont(lfd); ret = bind(lfd, ai->ai_addr, ai->ai_addrlen); if (ret < 0) { close(lfd); lfd = -1; continue; } if (!udp) { ret = listen(lfd, 5); if (ret < 0) { close(lfd); lfd = -1; continue; } } if (ipv4 == -1) { ipv4 = (ai->ai_family == AF_INET6 ? 0 : (ai->ai_family == AF_INET ? 1 : -1)); } syslog_maybe(auth_log, LOG_INFO, "curvetun on IPv%d via %s " "on port %s!\n", ai->ai_family == AF_INET ? 4 : 6, udp ? "UDP" : "TCP", port); syslog_maybe(auth_log, LOG_INFO, "Allowed overlay proto is " "IPv%d!\n", ipv4 ? 4 : 6); } freeaddrinfo(ahead); if (lfd < 0 || ipv4 < 0) syslog_panic("Cannot create socket!\n"); tunfd = tun_open_or_die(dev ? dev : DEVNAME_SERVER, IFF_TUN | IFF_NO_PI); pipe_or_die(efd, O_NONBLOCK); pipe_or_die(refd, O_NONBLOCK); set_nonblocking(lfd); events = xzmalloc(MAX_EPOLL_SIZE * sizeof(*events)); for (i = 0; i < MAX_EPOLL_SIZE; ++i) events[i].data.fd = -1; kdpfd = epoll_create(MAX_EPOLL_SIZE); if (kdpfd < 0) syslog_panic("Cannot create socket!\n"); set_epoll_descriptor(kdpfd, EPOLL_CTL_ADD, lfd, udp ? EPOLLIN | EPOLLET | EPOLLONESHOT : EPOLLIN); set_epoll_descriptor(kdpfd, EPOLL_CTL_ADD, efd[0], EPOLLIN); set_epoll_descriptor(kdpfd, EPOLL_CTL_ADD, refd[0], EPOLLIN); set_epoll_descriptor(kdpfd, EPOLL_CTL_ADD, tunfd, EPOLLIN | EPOLLET | EPOLLONESHOT); curfds = 4; trie_init(); cpus = get_number_cpus_online(); threads = cpus * THREADS_PER_CPU; if (!ispow2(threads)) syslog_panic("Thread number not power of two!\n"); threadpool = xzmalloc(sizeof(*threadpool) * threads); thread_spawn_or_panic(cpus, efd[1], refd[1], tunfd, ipv4, udp); init_cpusched(threads); register_socket(tunfd); register_socket(lfd); syslog(LOG_INFO, "curvetun up and running!\n"); while (likely(!sigint)) { nfds = epoll_wait(kdpfd, events, curfds, -1); if (nfds < 0) { syslog(LOG_ERR, "epoll_wait error: %s\n", strerror(errno)); break; } for (i = 0; i < nfds; ++i) { if (unlikely(events[i].data.fd < 0)) continue; if (events[i].data.fd == lfd && !udp) { int ncpu; char hbuff[256], sbuff[256]; struct sockaddr_storage taddr; socklen_t tlen; tlen = sizeof(taddr); nfd = accept(lfd, (struct sockaddr *) &taddr, &tlen); if (nfd < 0) { syslog(LOG_ERR, "accept error: %s\n", strerror(errno)); continue; } if (curfds + 1 > MAX_EPOLL_SIZE) { close(nfd); continue; } curfds++; ncpu = register_socket(nfd); memset(hbuff, 0, sizeof(hbuff)); memset(sbuff, 0, sizeof(sbuff)); getnameinfo((struct sockaddr *) &taddr, tlen, hbuff, sizeof(hbuff), sbuff, sizeof(sbuff), NI_NUMERICHOST | NI_NUMERICSERV); syslog_maybe(auth_log, LOG_INFO, "New connection " "from %s:%s (%d active client connections) - id %d on CPU%d", hbuff, sbuff, curfds-4, nfd, ncpu); set_nonblocking(nfd); set_socket_keepalive(nfd); set_tcp_nodelay(nfd); ret = set_epoll_descriptor2(kdpfd, EPOLL_CTL_ADD, nfd, EPOLLIN | EPOLLET | EPOLLONESHOT); if (ret < 0) { close(nfd); curfds--; continue; } } else if (events[i].data.fd == refd[0]) { int fd_one; ret = read_exact(refd[0], &fd_one, sizeof(fd_one), 1); if (ret != sizeof(fd_one) || fd_one <= 0) continue; ret = set_epoll_descriptor2(kdpfd, EPOLL_CTL_MOD, fd_one, EPOLLIN | EPOLLET | EPOLLONESHOT); if (ret < 0) { close(fd_one); continue; } } else if (events[i].data.fd == efd[0]) { int fd_del, test; ret = read_exact(efd[0], &fd_del, sizeof(fd_del), 1); if (ret != sizeof(fd_del) || fd_del <= 0) continue; ret = read(fd_del, &test, sizeof(test)); if (ret < 0 && errno == EBADF) continue; ret = set_epoll_descriptor2(kdpfd, EPOLL_CTL_DEL, fd_del, 0); if (ret < 0) { close(fd_del); continue; } close(fd_del); curfds--; unregister_socket(fd_del); syslog_maybe(auth_log, LOG_INFO, "Closed connection " "with id %d (%d active client connections remain)\n", fd_del, curfds-4); } else { int cpu, fd_work = events[i].data.fd; if (!udp) cpu = socket_to_cpu(fd_work); else udp_cpu = (udp_cpu + 1) & (threads - 1); write_exact(threadpool[udp ? udp_cpu : cpu].efd[1], &fd_work, sizeof(fd_work), 1); } } } syslog(LOG_INFO, "curvetun prepare shut down!\n"); close(lfd); close(efd[0]); close(efd[1]); close(refd[0]); close(refd[1]); close(tunfd); thread_finish(cpus); xfree(threadpool); xfree(events); unregister_socket(lfd); unregister_socket(tunfd); destroy_cpusched(); trie_cleanup(); destroy_user_store(); syslog(LOG_INFO, "curvetun shut down!\n"); closelog(); return 0; }
void register_client_socket (int clisox) { register_socket (clisox, SOF_CLIENT); }
void register_server_socket (int srvsox) { register_socket (srvsox, SOF_SERVER); }