| /* |
| * libwebsockets - small server side websockets and web server implementation |
| * |
| * Copyright (C) 2010 Andy Green <andy@warmcat.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation: |
| * version 2.1 of the License. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| * MA 02110-1301 USA |
| */ |
| |
| #include "private-libwebsockets.h" |
| |
| void |
| libwebsocket_close_and_free_session(struct libwebsocket *wsi) |
| { |
| int n; |
| |
| if ((unsigned long)wsi < LWS_MAX_PROTOCOLS) |
| return; |
| |
| n = wsi->state; |
| |
| wsi->state = WSI_STATE_DEAD_SOCKET; |
| |
| if (wsi->protocol->callback && n == WSI_STATE_ESTABLISHED) |
| wsi->protocol->callback(wsi, LWS_CALLBACK_CLOSED, |
| wsi->user_space, NULL, 0); |
| |
| for (n = 0; n < WSI_TOKEN_COUNT; n++) |
| if (wsi->utf8_token[n].token) |
| free(wsi->utf8_token[n].token); |
| |
| /* fprintf(stderr, "closing fd=%d\n", wsi->sock); */ |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (wsi->ssl) { |
| n = SSL_get_fd(wsi->ssl); |
| SSL_shutdown(wsi->ssl); |
| close(n); |
| SSL_free(wsi->ssl); |
| } else { |
| #endif |
| shutdown(wsi->sock, SHUT_RDWR); |
| close(wsi->sock); |
| #ifdef LWS_OPENSSL_SUPPORT |
| } |
| #endif |
| if (wsi->user_space) |
| free(wsi->user_space); |
| |
| free(wsi); |
| } |
| |
| static int |
| libwebsocket_poll_connections(struct libwebsocket_context *this) |
| { |
| unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + MAX_BROADCAST_PAYLOAD + |
| LWS_SEND_BUFFER_POST_PADDING]; |
| int client = this->count_protocols + 1; |
| struct libwebsocket *wsi; |
| int n; |
| size_t len; |
| |
| /* check for activity on client sockets */ |
| |
| for (; client < this->fds_count; client++) { |
| |
| /* handle session socket closed */ |
| |
| if (this->fds[client].revents & (POLLERR | POLLHUP)) { |
| |
| debug("Session Socket %d %p (fd=%d) dead\n", |
| client, (void *)this->wsi[client], |
| this->fds[client].fd); |
| |
| libwebsocket_close_and_free_session(this->wsi[client]); |
| goto nuke_this; |
| } |
| |
| /* the guy requested a callback when it was OK to write */ |
| |
| if ((unsigned long)this->wsi[client] > LWS_MAX_PROTOCOLS && |
| this->fds[client].revents & POLLOUT) { |
| |
| this->fds[client].events &= ~POLLOUT; |
| |
| this->wsi[client]->protocol->callback(this->wsi[client], |
| LWS_CALLBACK_CLIENT_WRITEABLE, |
| this->wsi[client]->user_space, |
| NULL, 0); |
| } |
| |
| /* any incoming data ready? */ |
| |
| if (!(this->fds[client].revents & POLLIN)) |
| continue; |
| |
| /* broadcast? */ |
| |
| if ((unsigned long)this->wsi[client] < LWS_MAX_PROTOCOLS) { |
| |
| /* get the issued broadcast payload from the socket */ |
| |
| len = read(this->fds[client].fd, |
| buf + LWS_SEND_BUFFER_PRE_PADDING, |
| MAX_BROADCAST_PAYLOAD); |
| |
| if (len < 0) { |
| fprintf(stderr, |
| "Error reading broadcast payload\n"); |
| continue; |
| } |
| |
| /* broadcast it to all guys with this protocol index */ |
| |
| for (n = this->count_protocols + 1; |
| n < this->fds_count; n++) { |
| |
| wsi = this->wsi[n]; |
| |
| if ((unsigned long)wsi < LWS_MAX_PROTOCOLS) |
| continue; |
| |
| /* |
| * never broadcast to non-established |
| * connection |
| */ |
| |
| if (wsi->state != WSI_STATE_ESTABLISHED) |
| continue; |
| |
| /* only to clients connected to us */ |
| |
| if (wsi->client_mode) |
| continue; |
| |
| /* |
| * only broadcast to connections using |
| * the requested protocol |
| */ |
| |
| if (wsi->protocol->protocol_index != |
| (int)(unsigned long)this->wsi[client]) |
| continue; |
| |
| /* broadcast it to this connection */ |
| |
| wsi->protocol->callback(wsi, |
| LWS_CALLBACK_BROADCAST, |
| wsi->user_space, |
| buf + LWS_SEND_BUFFER_PRE_PADDING, len); |
| } |
| |
| continue; |
| } |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (this->wsi[client]->ssl) |
| n = SSL_read(this->wsi[client]->ssl, buf, sizeof buf); |
| else |
| #endif |
| n = recv(this->fds[client].fd, buf, sizeof buf, 0); |
| |
| if (n < 0) { |
| fprintf(stderr, "Socket read returned %d\n", n); |
| continue; |
| } |
| if (!n) { |
| libwebsocket_close_and_free_session(this->wsi[client]); |
| goto nuke_this; |
| } |
| |
| /* service incoming data */ |
| |
| n = libwebsocket_read(this->wsi[client], buf, n); |
| if (n >= 0) |
| continue; |
| /* |
| * it closed and nuked wsi[client], so remove the |
| * socket handle and wsi from our service list |
| */ |
| nuke_this: |
| |
| debug("nuking wsi %p, fsd_count = %d\n", |
| (void *)this->wsi[client], this->fds_count - 1); |
| |
| this->fds_count--; |
| for (n = client; n < this->fds_count; n++) { |
| this->fds[n] = this->fds[n + 1]; |
| this->wsi[n] = this->wsi[n + 1]; |
| } |
| |
| return 0; |
| |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * libwebsocket_context_destroy() - Destroy the websocket context |
| * @this: Websocket context |
| * |
| * This function closes any active connections and then frees the |
| * context. After calling this, any further use of the context is |
| * undefined. |
| */ |
| void |
| libwebsocket_context_destroy(struct libwebsocket_context *this) |
| { |
| int client; |
| |
| /* close listening skt and per-protocol broadcast sockets */ |
| for (client = 0; client < this->fds_count; client++) |
| libwebsocket_close_and_free_session(this->wsi[client]); |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (this->ssl_ctx) |
| SSL_CTX_free(this->ssl_ctx); |
| #endif |
| |
| if (this) |
| free(this); |
| } |
| |
| /** |
| * libwebsocket_service() - Service any pending websocket activity |
| * @this: Websocket context |
| * @timeout_ms: Timeout for poll; 0 means return immediately if nothing needed |
| * service otherwise block and service immediately, returning |
| * after the timeout if nothing needed service. |
| * |
| * This function deals with any pending websocket traffic, for three |
| * kinds of event. It handles these events on both server and client |
| * types of connection the same. |
| * |
| * 1) Accept new connections to our context's server |
| * |
| * 2) Perform pending broadcast writes initiated from other forked |
| * processes (effectively serializing asynchronous broadcasts) |
| * |
| * 3) Call the receive callback for incoming frame data received by |
| * server or client connections. |
| * |
| * You need to call this service function periodically to all the above |
| * functions to happen; if your application is single-threaded you can |
| * just call it in your main event loop. |
| * |
| * Alternatively you can fork a new process that asynchronously handles |
| * calling this service in a loop. In that case you are happy if this |
| * call blocks your thread until it needs to take care of something and |
| * would call it with a large nonzero timeout. Your loop then takes no |
| * CPU while there is nothing happening. |
| * |
| * If you are calling it in a single-threaded app, you don't want it to |
| * wait around blocking other things in your loop from happening, so you |
| * would call it with a timeout_ms of 0, so it returns immediately if |
| * nothing is pending, or as soon as it services whatever was pending. |
| */ |
| |
| |
| int |
| libwebsocket_service(struct libwebsocket_context *this, int timeout_ms) |
| { |
| int n; |
| int client; |
| unsigned int clilen; |
| struct sockaddr_in cli_addr; |
| int fd; |
| |
| /* stay dead once we are dead */ |
| |
| if (this == NULL) |
| return 1; |
| |
| /* don't check listen socket if we are not listening */ |
| |
| if (this->listen_port) |
| n = poll(this->fds, this->fds_count, timeout_ms); |
| else |
| n = poll(&this->fds[1], this->fds_count - 1, timeout_ms); |
| |
| |
| if (n < 0 || this->fds[0].revents & (POLLERR | POLLHUP)) { |
| fprintf(stderr, "Listen Socket dead\n"); |
| goto fatal; |
| } |
| if (n == 0) /* poll timeout */ |
| return 0; |
| |
| /* handle accept on listening socket? */ |
| |
| for (client = 0; client < this->count_protocols + 1; client++) { |
| |
| if (!this->fds[client].revents & POLLIN) |
| continue; |
| |
| /* listen socket got an unencrypted connection... */ |
| |
| clilen = sizeof(cli_addr); |
| fd = accept(this->fds[client].fd, |
| (struct sockaddr *)&cli_addr, &clilen); |
| if (fd < 0) { |
| fprintf(stderr, "ERROR on accept"); |
| continue; |
| } |
| |
| if (this->fds_count >= MAX_CLIENTS) { |
| fprintf(stderr, "too busy"); |
| close(fd); |
| continue; |
| } |
| |
| if (client) { |
| /* |
| * accepting a connection to broadcast socket |
| * set wsi to be protocol index not pointer |
| */ |
| |
| this->wsi[this->fds_count] = |
| (struct libwebsocket *)(long)(client - 1); |
| |
| goto fill_in_fds; |
| } |
| |
| /* accepting connection to main listener */ |
| |
| this->wsi[this->fds_count] = |
| malloc(sizeof(struct libwebsocket)); |
| if (!this->wsi[this->fds_count]) { |
| fprintf(stderr, "Out of memory for new connection\n"); |
| continue; |
| } |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| this->wsi[this->fds_count]->ssl = NULL; |
| |
| if (this->use_ssl) { |
| |
| this->wsi[this->fds_count]->ssl = |
| SSL_new(this->ssl_ctx); |
| if (this->wsi[this->fds_count]->ssl == NULL) { |
| fprintf(stderr, "SSL_new failed: %s\n", |
| ERR_error_string(SSL_get_error( |
| this->wsi[this->fds_count]->ssl, 0), |
| NULL)); |
| free(this->wsi[this->fds_count]); |
| continue; |
| } |
| |
| SSL_set_fd(this->wsi[this->fds_count]->ssl, fd); |
| |
| n = SSL_accept(this->wsi[this->fds_count]->ssl); |
| if (n != 1) { |
| /* |
| * browsers seem to probe with various |
| * ssl params which fail then retry |
| * and succeed |
| */ |
| debug("SSL_accept failed skt %u: %s\n", |
| fd, |
| ERR_error_string(SSL_get_error( |
| this->wsi[this->fds_count]->ssl, |
| n), NULL)); |
| SSL_free( |
| this->wsi[this->fds_count]->ssl); |
| free(this->wsi[this->fds_count]); |
| continue; |
| } |
| debug("accepted new SSL conn " |
| "port %u on fd=%d SSL ver %s\n", |
| ntohs(cli_addr.sin_port), fd, |
| SSL_get_version(this->wsi[ |
| this->fds_count]->ssl)); |
| |
| } else |
| #endif |
| debug("accepted new conn port %u on fd=%d\n", |
| ntohs(cli_addr.sin_port), fd); |
| |
| /* intialize the instance struct */ |
| |
| this->wsi[this->fds_count]->sock = fd; |
| this->wsi[this->fds_count]->state = WSI_STATE_HTTP; |
| this->wsi[this->fds_count]->name_buffer_pos = 0; |
| this->wsi[this->fds_count]->client_mode = 0; |
| |
| for (n = 0; n < WSI_TOKEN_COUNT; n++) { |
| this->wsi[this->fds_count]-> |
| utf8_token[n].token = NULL; |
| this->wsi[this->fds_count]-> |
| utf8_token[n].token_len = 0; |
| } |
| |
| /* |
| * these can only be set once the protocol is known |
| * we set an unestablished connection's protocol pointer |
| * to the start of the supported list, so it can look |
| * for matching ones during the handshake |
| */ |
| this->wsi[this->fds_count]->protocol = this->protocols; |
| this->wsi[this->fds_count]->user_space = NULL; |
| |
| /* |
| * Default protocol is 76 / 00 |
| * After 76, there's a header specified to inform which |
| * draft the client wants, when that's seen we modify |
| * the individual connection's spec revision accordingly |
| */ |
| this->wsi[this->fds_count]->ietf_spec_revision = 0; |
| |
| fill_in_fds: |
| |
| /* |
| * make sure NO events are seen yet on this new socket |
| * (otherwise we inherit old fds[client].revents from |
| * previous socket there and die mysteriously! ) |
| */ |
| this->fds[this->fds_count].revents = 0; |
| |
| this->fds[this->fds_count].events = POLLIN; |
| this->fds[this->fds_count++].fd = fd; |
| |
| } |
| |
| /* service anything incoming on websocket connection */ |
| |
| libwebsocket_poll_connections(this); |
| |
| /* this round is done */ |
| |
| return 0; |
| |
| fatal: |
| |
| fprintf(stderr, "service hits fatal\n"); |
| |
| /* close listening skt and per-protocol broadcast sockets */ |
| for (client = 0; client < this->fds_count; client++) |
| close(this->fds[0].fd); |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (this->ssl_ctx) |
| SSL_CTX_free(this->ssl_ctx); |
| #endif |
| |
| if (this) |
| free(this); |
| |
| this = NULL; |
| |
| /* inform caller we are dead */ |
| |
| return 1; |
| } |
| |
| /** |
| * libwebsocket_callback_on_writable() - Request a callback when this socket |
| * becomes able to be written to without |
| * blocking |
| * |
| * @wsi: Websocket connection instance to get callback for |
| */ |
| |
| int |
| libwebsocket_callback_on_writable(struct libwebsocket *wsi) |
| { |
| struct libwebsocket_context *this = wsi->protocol->owning_server; |
| int n; |
| |
| for (n = this->count_protocols + 1; n < this->fds_count; n++) |
| if (this->wsi[n] == wsi) { |
| this->fds[n].events |= POLLOUT; |
| return 0; |
| } |
| |
| fprintf(stderr, "libwebsocket_callback_on_writable " |
| "didn't find socket\n"); |
| return 1; |
| } |
| |
| /** |
| * libwebsocket_callback_on_writable_all_protocol() - Request a callback for |
| * all connections using the given protocol when it |
| * becomes possible to write to each socket without |
| * blocking in turn. |
| * |
| * @protocol: Protocol whose connections will get callbacks |
| */ |
| |
| int |
| libwebsocket_callback_on_writable_all_protocol( |
| const struct libwebsocket_protocols *protocol) |
| { |
| struct libwebsocket_context *this = protocol->owning_server; |
| int n; |
| |
| for (n = this->count_protocols + 1; n < this->fds_count; n++) |
| if ((unsigned long)this->wsi[n] > LWS_MAX_PROTOCOLS) |
| if (this->wsi[n]->protocol == protocol) |
| this->fds[n].events |= POLLOUT; |
| |
| return 0; |
| } |
| |
| |
| /** |
| * libwebsocket_get_socket_fd() - returns the socket file descriptor |
| * |
| * You will not need this unless you are doing something special |
| * |
| * @wsi: Websocket connection instance |
| */ |
| |
| int |
| libwebsocket_get_socket_fd(struct libwebsocket *wsi) |
| { |
| return wsi->sock; |
| } |
| |
| /** |
| * libwebsocket_rx_flow_control() - Enable and disable socket servicing for |
| * receieved packets. |
| * |
| * If the output side of a server process becomes choked, this allows flow |
| * control for the input side. |
| * |
| * @wsi: Websocket connection instance to get callback for |
| * @enable: 0 = disable read servicing for this connection, 1 = enable |
| */ |
| |
| int |
| libwebsocket_rx_flow_control(struct libwebsocket *wsi, int enable) |
| { |
| struct libwebsocket_context *this = wsi->protocol->owning_server; |
| int n; |
| |
| for (n = this->count_protocols + 1; n < this->fds_count; n++) |
| if (this->wsi[n] == wsi) { |
| if (enable) |
| this->fds[n].events |= POLLIN; |
| else |
| this->fds[n].events &= ~POLLIN; |
| |
| return 0; |
| } |
| |
| fprintf(stderr, "libwebsocket_callback_on_writable " |
| "unable to find socket\n"); |
| return 1; |
| } |
| |
| /** |
| * libwebsocket_canonical_hostname() - returns this host's hostname |
| * |
| * This is typically used by client code to fill in the host parameter |
| * when making a client connection. You can only call it after the context |
| * has been created. |
| * |
| * @this: Websocket context |
| */ |
| |
| |
| extern const char * |
| libwebsocket_canonical_hostname(struct libwebsocket_context *this) |
| { |
| return (const char *)this->canonical_hostname; |
| } |
| |
| |
| static void sigpipe_handler(int x) |
| { |
| } |
| |
| |
| /** |
| * libwebsocket_create_context() - Create the websocket handler |
| * @port: Port to listen on... you can use 0 to suppress listening on |
| * any port, that's what you want if you are not running a |
| * websocket server at all but just using it as a client |
| * @protocols: Array of structures listing supported protocols and a protocol- |
| * specific callback for each one. The list is ended with an |
| * entry that has a NULL callback pointer. |
| * It's not const because we write the owning_server member |
| * @ssl_cert_filepath: If libwebsockets was compiled to use ssl, and you want |
| * to listen using SSL, set to the filepath to fetch the |
| * server cert from, otherwise NULL for unencrypted |
| * @ssl_private_key_filepath: filepath to private key if wanting SSL mode, |
| * else ignored |
| * @gid: group id to change to after setting listen socket, or -1. |
| * @uid: user id to change to after setting listen socket, or -1. |
| * |
| * This function creates the listening socket and takes care |
| * of all initialization in one step. |
| * |
| * After initialization, it returns a struct libwebsocket_context * that |
| * represents this server. After calling, user code needs to take care |
| * of calling libwebsocket_service() with the context pointer to get the |
| * server's sockets serviced. This can be done in the same process context |
| * or a forked process, or another thread, |
| * |
| * The protocol callback functions are called for a handful of events |
| * including http requests coming in, websocket connections becoming |
| * established, and data arriving; it's also called periodically to allow |
| * async transmission. |
| * |
| * HTTP requests are sent always to the FIRST protocol in @protocol, since |
| * at that time websocket protocol has not been negotiated. Other |
| * protocols after the first one never see any HTTP callack activity. |
| * |
| * The server created is a simple http server by default; part of the |
| * websocket standard is upgrading this http connection to a websocket one. |
| * |
| * This allows the same server to provide files like scripts and favicon / |
| * images or whatever over http and dynamic data over websockets all in |
| * one place; they're all handled in the user callback. |
| */ |
| |
| struct libwebsocket_context * |
| libwebsocket_create_context(int port, |
| struct libwebsocket_protocols *protocols, |
| const char *ssl_cert_filepath, |
| const char *ssl_private_key_filepath, |
| int gid, int uid) |
| { |
| int n; |
| int sockfd = 0; |
| int fd; |
| struct sockaddr_in serv_addr, cli_addr; |
| int opt = 1; |
| struct libwebsocket_context *this = NULL; |
| unsigned int slen; |
| char *p; |
| char hostname[1024]; |
| struct hostent* he; |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| SSL_METHOD *method; |
| char ssl_err_buf[512]; |
| #endif |
| |
| this = malloc(sizeof(struct libwebsocket_context)); |
| if (!this) { |
| fprintf(stderr, "No memory for websocket context\n"); |
| return NULL; |
| } |
| this->protocols = protocols; |
| this->listen_port = port; |
| this->http_proxy_port = 0; |
| this->http_proxy_address[0] = '\0'; |
| |
| /* find canonical hostname */ |
| |
| hostname[(sizeof hostname) - 1] = '\0'; |
| gethostname(hostname, (sizeof hostname) - 1); |
| he = gethostbyname(hostname); |
| strncpy(this->canonical_hostname, he->h_name, |
| sizeof this->canonical_hostname - 1); |
| this->canonical_hostname[sizeof this->canonical_hostname - 1] = '\0'; |
| |
| /* split the proxy ads:port if given */ |
| |
| p = getenv("http_proxy"); |
| if (p) { |
| strncpy(this->http_proxy_address, p, |
| sizeof this->http_proxy_address - 1); |
| this->http_proxy_address[ |
| sizeof this->http_proxy_address - 1] = '\0'; |
| |
| p = strchr(this->http_proxy_address, ':'); |
| if (p == NULL) { |
| fprintf(stderr, "http_proxy needs to be ads:port\n"); |
| return NULL; |
| } |
| *p = '\0'; |
| this->http_proxy_port = atoi(p + 1); |
| |
| fprintf(stderr, "Using proxy %s:%u\n", |
| this->http_proxy_address, |
| this->http_proxy_port); |
| } |
| |
| if (port) { |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| this->use_ssl = ssl_cert_filepath != NULL && |
| ssl_private_key_filepath != NULL; |
| if (this->use_ssl) |
| fprintf(stderr, " Compiled with SSL support, " |
| "using it\n"); |
| else |
| fprintf(stderr, " Compiled with SSL support, " |
| "not using it\n"); |
| |
| #else |
| if (ssl_cert_filepath != NULL && |
| ssl_private_key_filepath != NULL) { |
| fprintf(stderr, " Not compiled for OpenSSl support!\n"); |
| return NULL; |
| } |
| fprintf(stderr, " Compiled without SSL support, " |
| "serving unencrypted\n"); |
| #endif |
| } |
| |
| /* ignore SIGPIPE */ |
| |
| signal(SIGPIPE, sigpipe_handler); |
| |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| |
| /* basic openssl init */ |
| |
| SSL_library_init(); |
| |
| OpenSSL_add_all_algorithms(); |
| SSL_load_error_strings(); |
| |
| /* |
| * Firefox insists on SSLv23 not SSLv3 |
| * Konq disables SSLv2 by default now, SSLv23 works |
| */ |
| |
| method = (SSL_METHOD *)SSLv23_server_method(); |
| if (!method) { |
| fprintf(stderr, "problem creating ssl method: %s\n", |
| ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| return NULL; |
| } |
| this->ssl_ctx = SSL_CTX_new(method); /* create context */ |
| if (!this->ssl_ctx) { |
| fprintf(stderr, "problem creating ssl context: %s\n", |
| ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| return NULL; |
| } |
| |
| /* client context */ |
| |
| method = (SSL_METHOD *)SSLv23_client_method(); |
| if (!method) { |
| fprintf(stderr, "problem creating ssl method: %s\n", |
| ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| return NULL; |
| } |
| this->ssl_client_ctx = SSL_CTX_new(method); /* create context */ |
| if (!this->ssl_client_ctx) { |
| fprintf(stderr, "problem creating ssl context: %s\n", |
| ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| return NULL; |
| } |
| |
| |
| /* openssl init for cert verification (used with client sockets) */ |
| |
| if (!SSL_CTX_load_verify_locations(this->ssl_client_ctx, NULL, |
| LWS_OPENSSL_CLIENT_CERTS)) { |
| fprintf(stderr, "Unable to load SSL Client certs from %s " |
| "(set by --with-client-cert-dir= in configure) -- " |
| " client ssl isn't going to work", |
| LWS_OPENSSL_CLIENT_CERTS); |
| } |
| |
| if (this->use_ssl) { |
| |
| /* openssl init for server sockets */ |
| |
| /* set the local certificate from CertFile */ |
| n = SSL_CTX_use_certificate_file(this->ssl_ctx, |
| ssl_cert_filepath, SSL_FILETYPE_PEM); |
| if (n != 1) { |
| fprintf(stderr, "problem getting cert '%s': %s\n", |
| ssl_cert_filepath, |
| ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| return NULL; |
| } |
| /* set the private key from KeyFile */ |
| if (SSL_CTX_use_PrivateKey_file(this->ssl_ctx, |
| ssl_private_key_filepath, |
| SSL_FILETYPE_PEM) != 1) { |
| fprintf(stderr, "ssl problem getting key '%s': %s\n", |
| ssl_private_key_filepath, |
| ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| return NULL; |
| } |
| /* verify private key */ |
| if (!SSL_CTX_check_private_key(this->ssl_ctx)) { |
| fprintf(stderr, "Private SSL key doesn't match cert\n"); |
| return NULL; |
| } |
| |
| /* SSL is happy and has a cert it's content with */ |
| } |
| #endif |
| |
| /* selftest */ |
| |
| if (lws_b64_selftest()) |
| return NULL; |
| |
| /* set up our external listening socket we serve on */ |
| |
| if (port) { |
| |
| sockfd = socket(AF_INET, SOCK_STREAM, 0); |
| if (sockfd < 0) { |
| fprintf(stderr, "ERROR opening socket"); |
| return NULL; |
| } |
| |
| /* allow us to restart even if old sockets in TIME_WAIT */ |
| setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); |
| |
| bzero((char *) &serv_addr, sizeof(serv_addr)); |
| serv_addr.sin_family = AF_INET; |
| serv_addr.sin_addr.s_addr = INADDR_ANY; |
| serv_addr.sin_port = htons(port); |
| |
| n = bind(sockfd, (struct sockaddr *) &serv_addr, |
| sizeof(serv_addr)); |
| if (n < 0) { |
| fprintf(stderr, "ERROR on binding to port %d (%d %d)\n", |
| port, n, errno); |
| return NULL; |
| } |
| } |
| |
| /* drop any root privs for this process */ |
| |
| if (gid != -1) |
| if (setgid(gid)) |
| fprintf(stderr, "setgid: %s\n", strerror(errno)); |
| if (uid != -1) |
| if (setuid(uid)) |
| fprintf(stderr, "setuid: %s\n", strerror(errno)); |
| |
| /* |
| * prepare the poll() fd array... it's like this |
| * |
| * [0] = external listening socket |
| * [1 .. this->count_protocols] = per-protocol broadcast sockets |
| * [this->count_protocols + 1 ... this->fds_count-1] = connection skts |
| */ |
| |
| this->fds_count = 1; |
| this->fds[0].fd = sockfd; |
| this->fds[0].events = POLLIN; |
| this->count_protocols = 0; |
| |
| if (port) { |
| listen(sockfd, 5); |
| fprintf(stderr, " Listening on port %d\n", port); |
| } |
| |
| /* set up our internal broadcast trigger sockets per-protocol */ |
| |
| for (; protocols[this->count_protocols].callback; |
| this->count_protocols++) { |
| protocols[this->count_protocols].owning_server = this; |
| protocols[this->count_protocols].protocol_index = |
| this->count_protocols; |
| |
| fd = socket(AF_INET, SOCK_STREAM, 0); |
| if (fd < 0) { |
| fprintf(stderr, "ERROR opening socket"); |
| return NULL; |
| } |
| |
| /* allow us to restart even if old sockets in TIME_WAIT */ |
| setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); |
| |
| bzero((char *) &serv_addr, sizeof(serv_addr)); |
| serv_addr.sin_family = AF_INET; |
| serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); |
| serv_addr.sin_port = 0; /* pick the port for us */ |
| |
| n = bind(fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)); |
| if (n < 0) { |
| fprintf(stderr, "ERROR on binding to port %d (%d %d)\n", |
| port, n, errno); |
| return NULL; |
| } |
| |
| slen = sizeof cli_addr; |
| n = getsockname(fd, (struct sockaddr *)&cli_addr, &slen); |
| if (n < 0) { |
| fprintf(stderr, "getsockname failed\n"); |
| return NULL; |
| } |
| protocols[this->count_protocols].broadcast_socket_port = |
| ntohs(cli_addr.sin_port); |
| listen(fd, 5); |
| |
| debug(" Protocol %s broadcast socket %d\n", |
| protocols[this->count_protocols].name, |
| ntohs(cli_addr.sin_port)); |
| |
| this->fds[this->fds_count].fd = fd; |
| this->fds[this->fds_count].events = POLLIN; |
| /* wsi only exists for connections, not broadcast listener */ |
| this->wsi[this->fds_count] = NULL; |
| this->fds_count++; |
| } |
| |
| return this; |
| } |
| |
| |
| #ifndef LWS_NO_FORK |
| |
| /** |
| * libwebsockets_fork_service_loop() - Optional helper function forks off |
| * a process for the websocket server loop. |
| * You don't have to use this but if not, you |
| * have to make sure you are calling |
| * libwebsocket_service periodically to service |
| * the websocket traffic |
| * @this: server context returned by creation function |
| */ |
| |
| int |
| libwebsockets_fork_service_loop(struct libwebsocket_context *this) |
| { |
| int client; |
| int fd; |
| struct sockaddr_in cli_addr; |
| int n; |
| |
| n = fork(); |
| if (n < 0) |
| return n; |
| |
| if (!n) { |
| |
| /* main process context */ |
| |
| for (client = 1; client < this->count_protocols + 1; client++) { |
| fd = socket(AF_INET, SOCK_STREAM, 0); |
| if (fd < 0) { |
| fprintf(stderr, "Unable to create socket\n"); |
| return -1; |
| } |
| cli_addr.sin_family = AF_INET; |
| cli_addr.sin_port = htons( |
| this->protocols[client - 1].broadcast_socket_port); |
| cli_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); |
| n = connect(fd, (struct sockaddr *)&cli_addr, |
| sizeof cli_addr); |
| if (n < 0) { |
| fprintf(stderr, "Unable to connect to " |
| "broadcast socket %d, %s\n", |
| client, strerror(errno)); |
| return -1; |
| } |
| |
| this->protocols[client - 1].broadcast_socket_user_fd = |
| fd; |
| } |
| |
| |
| return 0; |
| } |
| |
| /* we want a SIGHUP when our parent goes down */ |
| prctl(PR_SET_PDEATHSIG, SIGHUP); |
| |
| /* in this forked process, sit and service websocket connections */ |
| |
| while (1) |
| if (libwebsocket_service(this, 1000)) |
| return -1; |
| |
| return 0; |
| } |
| |
| #endif |
| |
| /** |
| * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket |
| * connection. |
| * @wsi: pointer to struct websocket you want to know the protocol of |
| * |
| * |
| * This is useful to get the protocol to broadcast back to from inside |
| * the callback. |
| */ |
| |
| const struct libwebsocket_protocols * |
| libwebsockets_get_protocol(struct libwebsocket *wsi) |
| { |
| return wsi->protocol; |
| } |
| |
| /** |
| * libwebsockets_broadcast() - Sends a buffer to the callback for all active |
| * connections of the given protocol. |
| * @protocol: pointer to the protocol you will broadcast to all members of |
| * @buf: buffer containing the data to be broadcase. NOTE: this has to be |
| * allocated with LWS_SEND_BUFFER_PRE_PADDING valid bytes before |
| * the pointer and LWS_SEND_BUFFER_POST_PADDING afterwards in the |
| * case you are calling this function from callback context. |
| * @len: length of payload data in buf, starting from buf. |
| * |
| * This function allows bulk sending of a packet to every connection using |
| * the given protocol. It does not send the data directly; instead it calls |
| * the callback with a reason type of LWS_CALLBACK_BROADCAST. If the callback |
| * wants to actually send the data for that connection, the callback itself |
| * should call libwebsocket_write(). |
| * |
| * libwebsockets_broadcast() can be called from another fork context without |
| * having to take any care about data visibility between the processes, it'll |
| * "just work". |
| */ |
| |
| |
| int |
| libwebsockets_broadcast(const struct libwebsocket_protocols *protocol, |
| unsigned char *buf, size_t len) |
| { |
| struct libwebsocket_context *this = protocol->owning_server; |
| int n; |
| |
| if (!protocol->broadcast_socket_user_fd) { |
| /* |
| * We are either running unforked / flat, or we are being |
| * called from poll thread context |
| * eg, from a callback. In that case don't use sockets for |
| * broadcast IPC (since we can't open a socket connection to |
| * a socket listening on our own thread) but directly do the |
| * send action. |
| * |
| * Locking is not needed because we are by definition being |
| * called in the poll thread context and are serialized. |
| */ |
| |
| for (n = this->count_protocols + 1; n < this->fds_count; n++) { |
| |
| if ((unsigned long)this->wsi[n] < LWS_MAX_PROTOCOLS) |
| continue; |
| |
| /* never broadcast to non-established connection */ |
| if (this->wsi[n]->state != WSI_STATE_ESTABLISHED) |
| continue; |
| |
| /* only broadcast to guys using requested protocol */ |
| if (this->wsi[n]->protocol != protocol) |
| continue; |
| |
| this->wsi[n]->protocol->callback(this->wsi[n], |
| LWS_CALLBACK_BROADCAST, |
| this->wsi[n]->user_space, |
| buf, len); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * We're being called from a different process context than the server |
| * loop. Instead of broadcasting directly, we send our |
| * payload on a socket to do the IPC; the server process will serialize |
| * the broadcast action in its main poll() loop. |
| * |
| * There's one broadcast socket listening for each protocol supported |
| * set up when the websocket server initializes |
| */ |
| |
| n = send(protocol->broadcast_socket_user_fd, buf, len, MSG_NOSIGNAL); |
| |
| return n; |
| } |