Andy Green | 05a0a7b | 2010-10-31 17:51:39 +0000 | [diff] [blame] | 1 | /* |
Andy Green | a0da8a8 | 2010-11-08 17:12:19 +0000 | [diff] [blame] | 2 | * libwebsockets - small server side websockets and web server implementation |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 3 | * |
Andy Green | a0da8a8 | 2010-11-08 17:12:19 +0000 | [diff] [blame] | 4 | * Copyright (C) 2010 Andy Green <andy@warmcat.com> |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation: |
| 9 | * version 2.1 of the License. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| 19 | * MA 02110-1301 USA |
Andy Green | 05a0a7b | 2010-10-31 17:51:39 +0000 | [diff] [blame] | 20 | */ |
| 21 | |
Andy Green | 7c212cc | 2010-11-08 20:20:42 +0000 | [diff] [blame] | 22 | #include "private-libwebsockets.h" |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 23 | |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 24 | #ifdef LWS_OPENSSL_SUPPORT |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 25 | SSL_CTX *ssl_ctx; |
| 26 | int use_ssl; |
| 27 | #endif |
| 28 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 29 | void |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 30 | libwebsocket_close_and_free_session(struct libwebsocket *wsi) |
| 31 | { |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 32 | int n; |
| 33 | |
| 34 | if ((unsigned long)wsi < LWS_MAX_PROTOCOLS) |
| 35 | return; |
| 36 | |
| 37 | n = wsi->state; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 38 | |
| 39 | wsi->state = WSI_STATE_DEAD_SOCKET; |
| 40 | |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 41 | if (wsi->protocol->callback && n == WSI_STATE_ESTABLISHED) |
Andy Green | e77ddd8 | 2010-11-13 10:03:47 +0000 | [diff] [blame] | 42 | wsi->protocol->callback(wsi, LWS_CALLBACK_CLOSED, |
| 43 | wsi->user_space, NULL, 0); |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 44 | |
| 45 | for (n = 0; n < WSI_TOKEN_COUNT; n++) |
| 46 | if (wsi->utf8_token[n].token) |
| 47 | free(wsi->utf8_token[n].token); |
| 48 | |
Andy Green | 0ca6a17 | 2010-12-19 20:50:01 +0000 | [diff] [blame] | 49 | /* fprintf(stderr, "closing fd=%d\n", wsi->sock); */ |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 50 | |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 51 | #ifdef LWS_OPENSSL_SUPPORT |
| 52 | if (use_ssl) { |
| 53 | n = SSL_get_fd(wsi->ssl); |
| 54 | SSL_shutdown(wsi->ssl); |
| 55 | close(n); |
| 56 | SSL_free(wsi->ssl); |
| 57 | } else { |
| 58 | #endif |
| 59 | shutdown(wsi->sock, SHUT_RDWR); |
| 60 | close(wsi->sock); |
| 61 | #ifdef LWS_OPENSSL_SUPPORT |
| 62 | } |
| 63 | #endif |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 64 | if (wsi->user_space) |
| 65 | free(wsi->user_space); |
| 66 | |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 67 | free(wsi); |
| 68 | } |
| 69 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 70 | static int |
| 71 | libwebsocket_poll_connections(struct libwebsocket_context *this) |
| 72 | { |
| 73 | unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + MAX_BROADCAST_PAYLOAD + |
| 74 | LWS_SEND_BUFFER_POST_PADDING]; |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 75 | int client = this->count_protocols + 1; |
| 76 | struct libwebsocket *wsi; |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 77 | int n; |
| 78 | size_t len; |
| 79 | |
| 80 | /* check for activity on client sockets */ |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 81 | |
| 82 | for (; client < this->fds_count; client++) { |
| 83 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 84 | /* handle session socket closed */ |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 85 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 86 | if (this->fds[client].revents & (POLLERR | POLLHUP)) { |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 87 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 88 | debug("Session Socket %d %p (fd=%d) dead\n", |
| 89 | client, this->wsi[client], this->fds[client]); |
| 90 | |
| 91 | libwebsocket_close_and_free_session(this->wsi[client]); |
| 92 | goto nuke_this; |
| 93 | } |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 94 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 95 | /* any incoming data ready? */ |
| 96 | |
| 97 | if (!(this->fds[client].revents & POLLIN)) |
| 98 | continue; |
| 99 | |
| 100 | /* broadcast? */ |
| 101 | |
| 102 | if ((unsigned long)this->wsi[client] < LWS_MAX_PROTOCOLS) { |
| 103 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 104 | /* get the issued broadcast payload from the socket */ |
| 105 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 106 | len = read(this->fds[client].fd, |
| 107 | buf + LWS_SEND_BUFFER_PRE_PADDING, |
| 108 | MAX_BROADCAST_PAYLOAD); |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 109 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 110 | if (len < 0) { |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 111 | fprintf(stderr, |
| 112 | "Error reading broadcast payload\n"); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 113 | continue; |
| 114 | } |
| 115 | |
| 116 | /* broadcast it to all guys with this protocol index */ |
| 117 | |
| 118 | for (n = this->count_protocols + 1; |
| 119 | n < this->fds_count; n++) { |
| 120 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 121 | wsi = this->wsi[n]; |
| 122 | |
| 123 | if ((unsigned long)wsi < LWS_MAX_PROTOCOLS) |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 124 | continue; |
| 125 | |
| 126 | /* |
| 127 | * never broadcast to non-established |
| 128 | * connection |
| 129 | */ |
| 130 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 131 | if (wsi->state != WSI_STATE_ESTABLISHED) |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 132 | continue; |
| 133 | |
| 134 | /* |
| 135 | * only broadcast to connections using |
| 136 | * the requested protocol |
| 137 | */ |
| 138 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 139 | if (wsi->protocol->protocol_index != |
| 140 | (int)(unsigned long)this->wsi[client]) |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 141 | continue; |
| 142 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 143 | /* broadcast it to this connection */ |
| 144 | |
| 145 | wsi->protocol->callback(wsi, |
| 146 | LWS_CALLBACK_BROADCAST, |
| 147 | wsi->user_space, |
Andy Green | 0ca6a17 | 2010-12-19 20:50:01 +0000 | [diff] [blame] | 148 | buf + LWS_SEND_BUFFER_PRE_PADDING, len); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | continue; |
| 152 | } |
| 153 | |
| 154 | #ifdef LWS_OPENSSL_SUPPORT |
| 155 | if (this->use_ssl) |
| 156 | n = SSL_read(this->wsi[client]->ssl, buf, sizeof buf); |
| 157 | else |
| 158 | #endif |
| 159 | n = recv(this->fds[client].fd, buf, sizeof buf, 0); |
| 160 | |
| 161 | if (n < 0) { |
| 162 | fprintf(stderr, "Socket read returned %d\n", n); |
| 163 | continue; |
| 164 | } |
| 165 | if (!n) { |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 166 | libwebsocket_close_and_free_session(this->wsi[client]); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 167 | goto nuke_this; |
| 168 | } |
| 169 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 170 | /* service incoming data */ |
| 171 | |
| 172 | if (libwebsocket_read(this->wsi[client], buf, n) >= 0) |
| 173 | continue; |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 174 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 175 | /* |
| 176 | * it closed and nuked wsi[client], so remove the |
| 177 | * socket handle and wsi from our service list |
| 178 | */ |
| 179 | nuke_this: |
| 180 | |
| 181 | debug("nuking wsi %p, fsd_count = %d\n", |
| 182 | this->wsi[client], this->fds_count - 1); |
| 183 | |
| 184 | this->fds_count--; |
| 185 | for (n = client; n < this->fds_count; n++) { |
| 186 | this->fds[n] = this->fds[n + 1]; |
| 187 | this->wsi[n] = this->wsi[n + 1]; |
| 188 | } |
| 189 | break; |
| 190 | } |
| 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | |
| 196 | |
Andy Green | ab990e4 | 2010-10-31 12:42:52 +0000 | [diff] [blame] | 197 | /** |
| 198 | * libwebsocket_create_server() - Create the listening websockets server |
| 199 | * @port: Port to listen on |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 200 | * @protocols: Array of structures listing supported protocols and a protocol- |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 201 | * specific callback for each one. The list is ended with an |
| 202 | * entry that has a NULL callback pointer. |
| 203 | * It's not const because we write the owning_server member |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 204 | * @ssl_cert_filepath: If libwebsockets was compiled to use ssl, and you want |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 205 | * to listen using SSL, set to the filepath to fetch the |
| 206 | * server cert from, otherwise NULL for unencrypted |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 207 | * @ssl_private_key_filepath: filepath to private key if wanting SSL mode, |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 208 | * else ignored |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 209 | * @gid: group id to change to after setting listen socket, or -1. |
| 210 | * @uid: user id to change to after setting listen socket, or -1. |
Andy Green | 05464c6 | 2010-11-12 10:44:18 +0000 | [diff] [blame] | 211 | * |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 212 | * This function creates the listening socket and takes care |
| 213 | * of all initialization in one step. |
| 214 | * |
| 215 | * After initialization, it forks a thread that will sits in a service loop |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 216 | * and returns to the caller. The actual service actions are performed by |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 217 | * user code in a per-protocol callback from the appropriate one selected |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 218 | * by the client from the list in @protocols. |
Andy Green | 05464c6 | 2010-11-12 10:44:18 +0000 | [diff] [blame] | 219 | * |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 220 | * The protocol callback functions are called for a handful of events |
| 221 | * including http requests coming in, websocket connections becoming |
| 222 | * established, and data arriving; it's also called periodically to allow |
| 223 | * async transmission. |
| 224 | * |
| 225 | * HTTP requests are sent always to the FIRST protocol in @protocol, since |
| 226 | * at that time websocket protocol has not been negotiated. Other |
| 227 | * protocols after the first one never see any HTTP callack activity. |
| 228 | * |
| 229 | * The server created is a simple http server by default; part of the |
| 230 | * websocket standard is upgrading this http connection to a websocket one. |
| 231 | * |
| 232 | * This allows the same server to provide files like scripts and favicon / |
| 233 | * images or whatever over http and dynamic data over websockets all in |
| 234 | * one place; they're all handled in the user callback. |
Andy Green | ab990e4 | 2010-10-31 12:42:52 +0000 | [diff] [blame] | 235 | */ |
Andy Green | 4ea6006 | 2010-10-30 12:15:07 +0100 | [diff] [blame] | 236 | |
Andy Green | ea71ed1 | 2010-10-31 07:40:33 +0000 | [diff] [blame] | 237 | int libwebsocket_create_server(int port, |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 238 | struct libwebsocket_protocols *protocols, |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 239 | const char *ssl_cert_filepath, |
| 240 | const char *ssl_private_key_filepath, |
Andy Green | ce510c6 | 2010-11-11 12:48:13 +0000 | [diff] [blame] | 241 | int gid, int uid) |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 242 | { |
| 243 | int n; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 244 | int client; |
Andy Green | 69fa072 | 2010-11-03 08:25:13 +0000 | [diff] [blame] | 245 | int sockfd; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 246 | int fd; |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 247 | unsigned int clilen; |
| 248 | struct sockaddr_in serv_addr, cli_addr; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 249 | int opt = 1; |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 250 | struct libwebsocket_context *this = NULL; |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 251 | unsigned int slen; |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 252 | |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 253 | #ifdef LWS_OPENSSL_SUPPORT |
Andy Green | f2f54d5 | 2010-11-15 22:08:00 +0000 | [diff] [blame] | 254 | SSL_METHOD *method; |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 255 | char ssl_err_buf[512]; |
| 256 | |
| 257 | use_ssl = ssl_cert_filepath != NULL && ssl_private_key_filepath != NULL; |
| 258 | if (use_ssl) |
| 259 | fprintf(stderr, " Compiled with SSL support, using it\n"); |
| 260 | else |
Andy Green | 018d8eb | 2010-11-08 21:04:23 +0000 | [diff] [blame] | 261 | fprintf(stderr, " Compiled with SSL support, not using it\n"); |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 262 | |
| 263 | #else |
| 264 | if (ssl_cert_filepath != NULL && ssl_private_key_filepath != NULL) { |
| 265 | fprintf(stderr, " Not compiled for OpenSSl support!\n"); |
| 266 | return -1; |
| 267 | } |
Andy Green | 018d8eb | 2010-11-08 21:04:23 +0000 | [diff] [blame] | 268 | fprintf(stderr, " Compiled without SSL support, serving unencrypted\n"); |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 269 | #endif |
| 270 | |
| 271 | #ifdef LWS_OPENSSL_SUPPORT |
| 272 | if (use_ssl) { |
| 273 | SSL_library_init(); |
| 274 | |
| 275 | OpenSSL_add_all_algorithms(); |
| 276 | SSL_load_error_strings(); |
| 277 | |
Andy Green | 0ca6a17 | 2010-12-19 20:50:01 +0000 | [diff] [blame] | 278 | /* |
| 279 | * Firefox insists on SSLv23 not SSLv3 |
| 280 | * Konq disables SSLv2 by default now, SSLv23 works |
| 281 | */ |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 282 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 283 | method = (SSL_METHOD *)SSLv23_server_method(); |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 284 | if (!method) { |
| 285 | fprintf(stderr, "problem creating ssl method: %s\n", |
| 286 | ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| 287 | return -1; |
| 288 | } |
| 289 | ssl_ctx = SSL_CTX_new(method); /* create context */ |
| 290 | if (!ssl_ctx) { |
| 291 | printf("problem creating ssl context: %s\n", |
| 292 | ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| 293 | return -1; |
| 294 | } |
| 295 | /* set the local certificate from CertFile */ |
| 296 | n = SSL_CTX_use_certificate_file(ssl_ctx, |
| 297 | ssl_cert_filepath, SSL_FILETYPE_PEM); |
| 298 | if (n != 1) { |
| 299 | fprintf(stderr, "problem getting cert '%s': %s\n", |
| 300 | ssl_cert_filepath, |
| 301 | ERR_error_string(ERR_get_error(), ssl_err_buf)); |
| 302 | return -1; |
| 303 | } |
| 304 | /* set the private key from KeyFile */ |
Andy Green | 018d8eb | 2010-11-08 21:04:23 +0000 | [diff] [blame] | 305 | if (SSL_CTX_use_PrivateKey_file(ssl_ctx, |
| 306 | ssl_private_key_filepath, |
| 307 | SSL_FILETYPE_PEM) != 1) { |
| 308 | fprintf(stderr, "ssl problem getting key '%s': %s\n", |
| 309 | ssl_private_key_filepath, |
| 310 | ERR_error_string(ERR_get_error(), ssl_err_buf)); |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 311 | return -1; |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 312 | } |
| 313 | /* verify private key */ |
| 314 | if (!SSL_CTX_check_private_key(ssl_ctx)) { |
Andy Green | 018d8eb | 2010-11-08 21:04:23 +0000 | [diff] [blame] | 315 | fprintf(stderr, "Private SSL key doesn't match cert\n"); |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 316 | return -1; |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | /* SSL is happy and has a cert it's content with */ |
| 320 | } |
| 321 | #endif |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 322 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 323 | this = malloc(sizeof(struct libwebsocket_context)); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 324 | |
| 325 | /* set up our external listening socket we serve on */ |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 326 | |
Andy Green | 775c0dd | 2010-10-29 14:15:22 +0100 | [diff] [blame] | 327 | sockfd = socket(AF_INET, SOCK_STREAM, 0); |
| 328 | if (sockfd < 0) { |
| 329 | fprintf(stderr, "ERROR opening socket"); |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 330 | return -1; |
Andy Green | 775c0dd | 2010-10-29 14:15:22 +0100 | [diff] [blame] | 331 | } |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 332 | |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 333 | /* allow us to restart even if old sockets in TIME_WAIT */ |
| 334 | setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); |
Andy Green | 775c0dd | 2010-10-29 14:15:22 +0100 | [diff] [blame] | 335 | |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 336 | bzero((char *) &serv_addr, sizeof(serv_addr)); |
Andy Green | 775c0dd | 2010-10-29 14:15:22 +0100 | [diff] [blame] | 337 | serv_addr.sin_family = AF_INET; |
| 338 | serv_addr.sin_addr.s_addr = INADDR_ANY; |
| 339 | serv_addr.sin_port = htons(port); |
Andy Green | e77ddd8 | 2010-11-13 10:03:47 +0000 | [diff] [blame] | 340 | |
Andy Green | 775c0dd | 2010-10-29 14:15:22 +0100 | [diff] [blame] | 341 | n = bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)); |
| 342 | if (n < 0) { |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 343 | fprintf(stderr, "ERROR on binding to port %d (%d %d)\n", |
| 344 | port, n, errno); |
| 345 | return -1; |
| 346 | } |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 347 | |
Andy Green | e77ddd8 | 2010-11-13 10:03:47 +0000 | [diff] [blame] | 348 | /* drop any root privs for this process */ |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 349 | |
| 350 | if (gid != -1) |
| 351 | if (setgid(gid)) |
| 352 | fprintf(stderr, "setgid: %s\n", strerror(errno)); |
| 353 | if (uid != -1) |
| 354 | if (setuid(uid)) |
| 355 | fprintf(stderr, "setuid: %s\n", strerror(errno)); |
| 356 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 357 | /* |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 358 | * prepare the poll() fd array... it's like this |
| 359 | * |
| 360 | * [0] = external listening socket |
| 361 | * [1 .. this->count_protocols] = per-protocol broadcast sockets |
| 362 | * [this->count_protocols + 1 ... this->fds_count-1] = connection skts |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 363 | */ |
| 364 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 365 | this->fds_count = 1; |
| 366 | this->fds[0].fd = sockfd; |
| 367 | this->fds[0].events = POLLIN; |
| 368 | this->count_protocols = 0; |
| 369 | #ifdef LWS_OPENSSL_SUPPORT |
| 370 | this->use_ssl = use_ssl; |
| 371 | #endif |
| 372 | |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 373 | listen(sockfd, 5); |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 374 | fprintf(stderr, " Listening on port %d\n", port); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 375 | |
| 376 | /* set up our internal broadcast trigger sockets per-protocol */ |
| 377 | |
| 378 | for (; protocols[this->count_protocols].callback; |
| 379 | this->count_protocols++) { |
| 380 | protocols[this->count_protocols].owning_server = this; |
| 381 | protocols[this->count_protocols].protocol_index = |
| 382 | this->count_protocols; |
| 383 | |
| 384 | fd = socket(AF_INET, SOCK_STREAM, 0); |
| 385 | if (fd < 0) { |
| 386 | fprintf(stderr, "ERROR opening socket"); |
| 387 | return -1; |
| 388 | } |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 389 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 390 | /* allow us to restart even if old sockets in TIME_WAIT */ |
| 391 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); |
| 392 | |
| 393 | bzero((char *) &serv_addr, sizeof(serv_addr)); |
| 394 | serv_addr.sin_family = AF_INET; |
| 395 | serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); |
| 396 | serv_addr.sin_port = 0; /* pick the port for us */ |
| 397 | |
| 398 | n = bind(fd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)); |
| 399 | if (n < 0) { |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 400 | fprintf(stderr, "ERROR on binding to port %d (%d %d)\n", |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 401 | port, n, errno); |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 402 | return -1; |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 403 | } |
| 404 | |
| 405 | slen = sizeof cli_addr; |
| 406 | n = getsockname(fd, (struct sockaddr *)&cli_addr, &slen); |
| 407 | if (n < 0) { |
| 408 | fprintf(stderr, "getsockname failed\n"); |
| 409 | return -1; |
| 410 | } |
| 411 | protocols[this->count_protocols].broadcast_socket_port = |
| 412 | ntohs(cli_addr.sin_port); |
| 413 | listen(fd, 5); |
| 414 | |
| 415 | debug(" Protocol %s broadcast socket %d\n", |
| 416 | protocols[this->count_protocols].name, |
| 417 | ntohs(cli_addr.sin_port)); |
| 418 | |
| 419 | this->fds[this->fds_count].fd = fd; |
| 420 | this->fds[this->fds_count].events = POLLIN; |
| 421 | /* wsi only exists for connections, not broadcast listener */ |
| 422 | this->wsi[this->fds_count] = NULL; |
| 423 | this->fds_count++; |
| 424 | } |
| 425 | |
| 426 | |
| 427 | /* |
| 428 | * We will enter out poll and service loop now, just before that |
| 429 | * fork and return to caller for the main thread of execution |
| 430 | */ |
| 431 | |
| 432 | n = fork(); |
| 433 | if (n < 0) { |
| 434 | fprintf(stderr, "Failed to fork websocket poll loop\n"); |
| 435 | return -1; |
| 436 | } |
| 437 | if (n) { |
| 438 | /* original process context */ |
| 439 | |
| 440 | /* |
| 441 | * before we return to caller, we set up per-protocol |
| 442 | * broadcast sockets connected to the server ready to use |
| 443 | */ |
| 444 | |
| 445 | /* give server fork a chance to start up */ |
Andy Green | 0ca6a17 | 2010-12-19 20:50:01 +0000 | [diff] [blame] | 446 | usleep(500000); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 447 | |
| 448 | for (client = 1; client < this->count_protocols + 1; client++) { |
| 449 | fd = socket(AF_INET, SOCK_STREAM, 0); |
| 450 | if (fd < 0) { |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 451 | fprintf(stderr, "Unable to create socket\n"); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 452 | return -1; |
| 453 | } |
| 454 | cli_addr.sin_family = AF_INET; |
| 455 | cli_addr.sin_port = htons( |
| 456 | protocols[client - 1].broadcast_socket_port); |
| 457 | cli_addr.sin_addr.s_addr = inet_addr("127.0.0.1"); |
| 458 | n = connect(fd, (struct sockaddr *)&cli_addr, |
| 459 | sizeof cli_addr); |
| 460 | if (n < 0) { |
| 461 | fprintf(stderr, "Unable to connect to " |
| 462 | "broadcast socket %d, %s\n", |
| 463 | client, strerror(errno)); |
| 464 | return -1; |
| 465 | } |
| 466 | |
| 467 | protocols[client - 1].broadcast_socket_user_fd = fd; |
| 468 | } |
| 469 | |
| 470 | fprintf(stderr, "libwebsocket poll process forked\n"); |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 471 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | /* we want a SIGHUP when our parent goes down */ |
| 476 | prctl(PR_SET_PDEATHSIG, SIGHUP); |
| 477 | |
| 478 | /* in this forked process, sit and service websocket connections */ |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 479 | |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 480 | while (1) { |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 481 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 482 | n = poll(this->fds, this->fds_count, 1000); |
| 483 | |
| 484 | if (n < 0 || this->fds[0].revents & (POLLERR | POLLHUP)) { |
Andy Green | 85ba32f | 2010-11-12 11:47:39 +0000 | [diff] [blame] | 485 | fprintf(stderr, "Listen Socket dead\n"); |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 486 | goto fatal; |
Andy Green | 775c0dd | 2010-10-29 14:15:22 +0100 | [diff] [blame] | 487 | } |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 488 | if (n == 0) /* poll timeout */ |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 489 | continue; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 490 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 491 | /* handle accept on listening socket? */ |
| 492 | |
| 493 | for (client = 0; client < this->count_protocols + 1; client++) { |
| 494 | |
| 495 | if (!this->fds[client].revents & POLLIN) |
| 496 | continue; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 497 | |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 498 | /* listen socket got an unencrypted connection... */ |
| 499 | |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 500 | clilen = sizeof(cli_addr); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 501 | fd = accept(this->fds[client].fd, |
| 502 | (struct sockaddr *)&cli_addr, &clilen); |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 503 | if (fd < 0) { |
| 504 | fprintf(stderr, "ERROR on accept"); |
| 505 | continue; |
| 506 | } |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 507 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 508 | if (this->fds_count >= MAX_CLIENTS) { |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 509 | fprintf(stderr, "too busy"); |
| 510 | close(fd); |
| 511 | continue; |
| 512 | } |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 513 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 514 | if (client) { |
| 515 | /* |
| 516 | * accepting a connection to broadcast socket |
| 517 | * set wsi to be protocol index not pointer |
| 518 | */ |
| 519 | |
| 520 | this->wsi[this->fds_count] = |
| 521 | (struct libwebsocket *)(long)(client - 1); |
| 522 | |
| 523 | goto fill_in_fds; |
| 524 | } |
| 525 | |
| 526 | /* accepting connection to main listener */ |
| 527 | |
| 528 | this->wsi[this->fds_count] = |
| 529 | malloc(sizeof(struct libwebsocket)); |
| 530 | if (!this->wsi[this->fds_count]) |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 531 | return -1; |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 532 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 533 | #ifdef LWS_OPENSSL_SUPPORT |
| 534 | if (this->use_ssl) { |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 535 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 536 | this->wsi[this->fds_count]->ssl = |
| 537 | SSL_new(ssl_ctx); |
| 538 | if (this->wsi[this->fds_count]->ssl == NULL) { |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 539 | fprintf(stderr, "SSL_new failed: %s\n", |
Andy Green | 018d8eb | 2010-11-08 21:04:23 +0000 | [diff] [blame] | 540 | ERR_error_string(SSL_get_error( |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 541 | this->wsi[this->fds_count]->ssl, 0), |
| 542 | NULL)); |
| 543 | free(this->wsi[this->fds_count]); |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 544 | continue; |
| 545 | } |
| 546 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 547 | SSL_set_fd(this->wsi[this->fds_count]->ssl, fd); |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 548 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 549 | n = SSL_accept(this->wsi[this->fds_count]->ssl); |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 550 | if (n != 1) { |
Andy Green | 018d8eb | 2010-11-08 21:04:23 +0000 | [diff] [blame] | 551 | /* |
| 552 | * browsers seem to probe with various |
| 553 | * ssl params which fail then retry |
| 554 | * and succeed |
| 555 | */ |
| 556 | debug("SSL_accept failed skt %u: %s\n", |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 557 | fd, |
| 558 | ERR_error_string(SSL_get_error( |
| 559 | this->wsi[this->fds_count]->ssl, |
| 560 | n), NULL)); |
| 561 | SSL_free( |
| 562 | this->wsi[this->fds_count]->ssl); |
| 563 | free(this->wsi[this->fds_count]); |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 564 | continue; |
| 565 | } |
Andy Green | 018d8eb | 2010-11-08 21:04:23 +0000 | [diff] [blame] | 566 | debug("accepted new SSL conn " |
| 567 | "port %u on fd=%d SSL ver %s\n", |
| 568 | ntohs(cli_addr.sin_port), fd, |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 569 | SSL_get_version(this->wsi[ |
| 570 | this->fds_count]->ssl)); |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 571 | |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 572 | } else |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 573 | #endif |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 574 | debug("accepted new conn port %u on fd=%d\n", |
| 575 | ntohs(cli_addr.sin_port), fd); |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 576 | |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 577 | /* intialize the instance struct */ |
| 578 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 579 | this->wsi[this->fds_count]->sock = fd; |
| 580 | this->wsi[this->fds_count]->state = WSI_STATE_HTTP; |
| 581 | this->wsi[this->fds_count]->name_buffer_pos = 0; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 582 | |
| 583 | for (n = 0; n < WSI_TOKEN_COUNT; n++) { |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 584 | this->wsi[this->fds_count]-> |
| 585 | utf8_token[n].token = NULL; |
| 586 | this->wsi[this->fds_count]-> |
| 587 | utf8_token[n].token_len = 0; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 588 | } |
| 589 | |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 590 | /* |
| 591 | * these can only be set once the protocol is known |
| 592 | * we set an unestablished connection's protocol pointer |
| 593 | * to the start of the supported list, so it can look |
| 594 | * for matching ones during the handshake |
| 595 | */ |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 596 | this->wsi[this->fds_count]->protocol = protocols; |
| 597 | this->wsi[this->fds_count]->user_space = NULL; |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 598 | |
Andy Green | ce510c6 | 2010-11-11 12:48:13 +0000 | [diff] [blame] | 599 | /* |
| 600 | * Default protocol is 76 |
| 601 | * After 76, there's a header specified to inform which |
Andy Green | 4f3943a | 2010-11-12 10:44:16 +0000 | [diff] [blame] | 602 | * draft the client wants, when that's seen we modify |
| 603 | * the individual connection's spec revision accordingly |
Andy Green | ce510c6 | 2010-11-11 12:48:13 +0000 | [diff] [blame] | 604 | */ |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 605 | this->wsi[this->fds_count]->ietf_spec_revision = 76; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 606 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 607 | fill_in_fds: |
Andy Green | 85ba32f | 2010-11-12 11:47:39 +0000 | [diff] [blame] | 608 | |
| 609 | /* |
| 610 | * make sure NO events are seen yet on this new socket |
| 611 | * (otherwise we inherit old fds[client].revents from |
| 612 | * previous socket there and die mysteriously! ) |
| 613 | */ |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 614 | this->fds[this->fds_count].revents = 0; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 615 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 616 | this->fds[this->fds_count].events = POLLIN; |
| 617 | this->fds[this->fds_count++].fd = fd; |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 618 | |
Andy Green | 775c0dd | 2010-10-29 14:15:22 +0100 | [diff] [blame] | 619 | } |
| 620 | |
Andy Green | 775c0dd | 2010-10-29 14:15:22 +0100 | [diff] [blame] | 621 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 622 | /* service anything incoming on websocket connection */ |
Andy Green | 69fa072 | 2010-11-03 08:25:13 +0000 | [diff] [blame] | 623 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 624 | libwebsocket_poll_connections(this); |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 625 | } |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 626 | |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 627 | fatal: |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 628 | |
| 629 | /* close listening skt and per-protocol broadcast sockets */ |
| 630 | for (client = 0; client < this->fds_count; client++) |
| 631 | close(this->fds[0].fd); |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 632 | |
Andy Green | 3faa9c7 | 2010-11-08 17:03:03 +0000 | [diff] [blame] | 633 | #ifdef LWS_OPENSSL_SUPPORT |
| 634 | SSL_CTX_free(ssl_ctx); |
| 635 | #endif |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 636 | kill(0, SIGTERM); |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 637 | |
| 638 | if (this) |
| 639 | free(this); |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 640 | |
Andy Green | 251f6fa | 2010-11-03 11:13:06 +0000 | [diff] [blame] | 641 | return 0; |
Andy Green | ff95d7a | 2010-10-28 22:36:01 +0100 | [diff] [blame] | 642 | } |
| 643 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 644 | /** |
| 645 | * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 646 | * connection. |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 647 | * @wsi: pointer to struct websocket you want to know the protocol of |
| 648 | * |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 649 | * |
| 650 | * This is useful to get the protocol to broadcast back to from inside |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 651 | * the callback. |
| 652 | */ |
Andy Green | ab990e4 | 2010-10-31 12:42:52 +0000 | [diff] [blame] | 653 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 654 | const struct libwebsocket_protocols * |
| 655 | libwebsockets_get_protocol(struct libwebsocket *wsi) |
| 656 | { |
| 657 | return wsi->protocol; |
| 658 | } |
| 659 | |
| 660 | /** |
| 661 | * libwebsockets_broadcast() - Sends a buffer to rthe callback for all active |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 662 | * connections of the given protocol. |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 663 | * @protocol: pointer to the protocol you will broadcast to all members of |
| 664 | * @buf: buffer containing the data to be broadcase. NOTE: this has to be |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 665 | * allocated with LWS_SEND_BUFFER_PRE_PADDING valid bytes before |
| 666 | * the pointer and LWS_SEND_BUFFER_POST_PADDING afterwards in the |
| 667 | * case you are calling this function from callback context. |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 668 | * @len: length of payload data in buf, starting from buf. |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 669 | * |
| 670 | * This function allows bulk sending of a packet to every connection using |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 671 | * the given protocol. It does not send the data directly; instead it calls |
| 672 | * the callback with a reason type of LWS_CALLBACK_BROADCAST. If the callback |
| 673 | * wants to actually send the data for that connection, the callback itself |
| 674 | * should call libwebsocket_write(). |
| 675 | * |
| 676 | * libwebsockets_broadcast() can be called from another fork context without |
| 677 | * having to take any care about data visibility between the processes, it'll |
| 678 | * "just work". |
| 679 | */ |
| 680 | |
| 681 | |
| 682 | int |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 683 | libwebsockets_broadcast(const struct libwebsocket_protocols *protocol, |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 684 | unsigned char *buf, size_t len) |
| 685 | { |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 686 | struct libwebsocket_context *this = protocol->owning_server; |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 687 | int n; |
| 688 | |
| 689 | if (!protocol->broadcast_socket_user_fd) { |
| 690 | /* |
| 691 | * we are being called from poll thread context |
| 692 | * eg, from a callback. In that case don't use sockets for |
| 693 | * broadcast IPC (since we can't open a socket connection to |
| 694 | * a socket listening on our own thread) but directly do the |
| 695 | * send action. |
| 696 | * |
| 697 | * Locking is not needed because we are by definition being |
| 698 | * called in the poll thread context and are serialized. |
| 699 | */ |
| 700 | |
| 701 | for (n = this->count_protocols + 1; n < this->fds_count; n++) { |
| 702 | |
| 703 | if ((unsigned long)this->wsi[n] < LWS_MAX_PROTOCOLS) |
| 704 | continue; |
| 705 | |
| 706 | /* never broadcast to non-established connection */ |
| 707 | |
| 708 | if (this->wsi[n]->state != WSI_STATE_ESTABLISHED) |
| 709 | continue; |
| 710 | |
| 711 | /* only broadcast to guys using requested protocol */ |
| 712 | |
| 713 | if (this->wsi[n]->protocol != protocol) |
| 714 | continue; |
| 715 | |
Andy Green | 8f037e4 | 2010-12-19 22:13:26 +0000 | [diff] [blame^] | 716 | this->wsi[n]->protocol->callback(this->wsi[n], |
| 717 | LWS_CALLBACK_BROADCAST, |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 718 | this->wsi[n]->user_space, |
| 719 | buf, len); |
| 720 | } |
| 721 | |
| 722 | return 0; |
| 723 | } |
| 724 | |
Andy Green | 0ca6a17 | 2010-12-19 20:50:01 +0000 | [diff] [blame] | 725 | /* |
| 726 | * We're being called from a different process context than the server |
| 727 | * loop. Instead of broadcasting directly, we send our |
| 728 | * payload on a socket to do the IPC; the server process will serialize |
| 729 | * the broadcast action in its main poll() loop. |
| 730 | * |
| 731 | * There's one broadcast socket listening for each protocol supported |
| 732 | * set up when the websocket server initializes |
| 733 | */ |
| 734 | |
Andy Green | b45993c | 2010-12-18 15:13:50 +0000 | [diff] [blame] | 735 | n = send(protocol->broadcast_socket_user_fd, buf, len, 0); |
| 736 | |
| 737 | return n; |
| 738 | } |