Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 1 | #include "private-libwebsockets.h" |
| 2 | #include <netdb.h> |
| 3 | |
| 4 | |
Andy Green | 90c7cbc | 2011-01-27 06:26:52 +0000 | [diff] [blame] | 5 | /** |
| 6 | * libwebsocket_client_connect() - Connect to another websocket server |
| 7 | * @this: Websocket context |
| 8 | * @address: Remote server address, eg, "myserver.com" |
| 9 | * @port: Port to connect to on the remote server, eg, 80 |
| 10 | * @ssl_connection: 0 = ws://, 1 = wss:// encrypted, 2 = wss:// allow self |
| 11 | * signed certs |
| 12 | * @path: Websocket path on server |
| 13 | * @host: Hostname on server |
| 14 | * @origin: Socket origin name |
| 15 | * @protocol: Comma-separated list of protocols being asked for from |
| 16 | * the server, or just one. The server will pick the one it |
| 17 | * likes best. |
Andy Green | bfb051f | 2011-02-09 08:49:14 +0000 | [diff] [blame] | 18 | * @ietf_version_or_minus_one: -1 to ask to connect using the default, latest |
| 19 | * protocol supported, or the specific protocol ordinal |
Andy Green | 90c7cbc | 2011-01-27 06:26:52 +0000 | [diff] [blame] | 20 | * |
| 21 | * This function creates a connection to a remote server |
| 22 | */ |
| 23 | |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 24 | struct libwebsocket * |
Andy Green | 90c7cbc | 2011-01-27 06:26:52 +0000 | [diff] [blame] | 25 | libwebsocket_client_connect(struct libwebsocket_context *this, |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 26 | const char *address, |
| 27 | int port, |
Andy Green | 90c7cbc | 2011-01-27 06:26:52 +0000 | [diff] [blame] | 28 | int ssl_connection, |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 29 | const char *path, |
| 30 | const char *host, |
| 31 | const char *origin, |
Andy Green | bfb051f | 2011-02-09 08:49:14 +0000 | [diff] [blame] | 32 | const char *protocol, |
| 33 | int ietf_version_or_minus_one) |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 34 | { |
| 35 | struct hostent *server_hostent; |
| 36 | struct sockaddr_in server_addr; |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 37 | char pkt[512]; |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 38 | struct pollfd pfd; |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 39 | struct libwebsocket *wsi; |
| 40 | int n; |
Andy Green | 9659f37 | 2011-01-27 22:01:43 +0000 | [diff] [blame] | 41 | int plen = 0; |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 42 | #ifndef LWS_OPENSSL_SUPPORT |
Andy Green | 90c7cbc | 2011-01-27 06:26:52 +0000 | [diff] [blame] | 43 | if (ssl_connection) { |
| 44 | fprintf(stderr, "libwebsockets not configured for ssl\n"); |
| 45 | return NULL; |
| 46 | } |
| 47 | #endif |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 48 | |
Andy Green | 6964bb5 | 2011-01-23 16:50:33 +0000 | [diff] [blame] | 49 | wsi = malloc(sizeof(struct libwebsocket)); |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 50 | if (wsi == NULL) |
| 51 | goto bail1; |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 52 | |
Darin Willits | c19456f | 2011-02-14 17:52:39 +0000 | [diff] [blame] | 53 | memset(wsi, 0, sizeof *wsi); |
| 54 | |
Andy Green | bfb051f | 2011-02-09 08:49:14 +0000 | [diff] [blame] | 55 | /* -1 means just use latest supported */ |
| 56 | |
| 57 | if (ietf_version_or_minus_one == -1) |
Andy Green | 193306c | 2011-02-26 11:08:46 +0000 | [diff] [blame] | 58 | ietf_version_or_minus_one = SPEC_LATEST_SUPPORTED; |
Andy Green | bfb051f | 2011-02-09 08:49:14 +0000 | [diff] [blame] | 59 | |
| 60 | wsi->ietf_spec_revision = ietf_version_or_minus_one; |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 61 | wsi->name_buffer_pos = 0; |
| 62 | wsi->user_space = NULL; |
| 63 | wsi->state = WSI_STATE_CLIENT_UNCONNECTED; |
| 64 | wsi->pings_vs_pongs = 0; |
Andy Green | 927eb7b | 2011-02-01 08:52:55 +0000 | [diff] [blame] | 65 | wsi->protocol = NULL; |
Andy Green | a71eafc | 2011-02-14 17:59:43 +0000 | [diff] [blame] | 66 | wsi->pending_timeout = NO_PENDING_TIMEOUT; |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 67 | #ifdef LWS_OPENSSL_SUPPORT |
| 68 | wsi->use_ssl = ssl_connection; |
| 69 | #endif |
| 70 | |
| 71 | /* copy parameters over so state machine has access */ |
| 72 | |
| 73 | wsi->c_path = malloc(strlen(path) + 1); |
| 74 | if (wsi->c_path == NULL) |
| 75 | goto bail1; |
| 76 | strcpy(wsi->c_path, path); |
| 77 | wsi->c_host = malloc(strlen(host) + 1); |
| 78 | if (wsi->c_host == NULL) |
| 79 | goto oom1; |
| 80 | strcpy(wsi->c_host, host); |
Andy Green | 08d3392 | 2011-02-26 10:22:49 +0000 | [diff] [blame] | 81 | if (origin) { |
| 82 | wsi->c_origin = malloc(strlen(origin) + 1); |
| 83 | strcpy(wsi->c_origin, origin); |
| 84 | if (wsi->c_origin == NULL) |
| 85 | goto oom2; |
| 86 | } else |
| 87 | wsi->c_origin = NULL; |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 88 | if (protocol) { |
| 89 | wsi->c_protocol = malloc(strlen(protocol) + 1); |
| 90 | if (wsi->c_protocol == NULL) |
| 91 | goto oom3; |
| 92 | strcpy(wsi->c_protocol, protocol); |
| 93 | } else |
| 94 | wsi->c_protocol = NULL; |
| 95 | |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 96 | |
Andy Green | bfb051f | 2011-02-09 08:49:14 +0000 | [diff] [blame] | 97 | /* set up appropriate masking */ |
| 98 | |
| 99 | wsi->xor_mask = xor_no_mask; |
| 100 | |
| 101 | switch (wsi->ietf_spec_revision) { |
Andy Green | eeaacb3 | 2011-03-01 20:44:24 +0000 | [diff] [blame] | 102 | case 0: |
| 103 | break; |
Andy Green | bfb051f | 2011-02-09 08:49:14 +0000 | [diff] [blame] | 104 | case 4: |
| 105 | wsi->xor_mask = xor_mask_04; |
| 106 | break; |
| 107 | case 5: |
Andy Green | 9514bf8 | 2011-02-26 11:13:56 +0000 | [diff] [blame] | 108 | case 6: |
Andy Green | bfb051f | 2011-02-09 08:49:14 +0000 | [diff] [blame] | 109 | wsi->xor_mask = xor_mask_05; |
| 110 | break; |
| 111 | default: |
| 112 | fprintf(stderr, |
| 113 | "Client ietf version %d not supported\n", |
| 114 | wsi->ietf_spec_revision); |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 115 | goto oom4; |
Andy Green | bfb051f | 2011-02-09 08:49:14 +0000 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | /* force no mask if he asks for that though */ |
| 119 | |
| 120 | if (this->options & LWS_SERVER_OPTION_DEFEAT_CLIENT_MASK) |
| 121 | wsi->xor_mask = xor_no_mask; |
| 122 | |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 123 | for (n = 0; n < WSI_TOKEN_COUNT; n++) { |
| 124 | wsi->utf8_token[n].token = NULL; |
| 125 | wsi->utf8_token[n].token_len = 0; |
| 126 | } |
| 127 | |
| 128 | /* |
Andy Green | 9659f37 | 2011-01-27 22:01:43 +0000 | [diff] [blame] | 129 | * proxy? |
| 130 | */ |
| 131 | |
| 132 | if (this->http_proxy_port) { |
| 133 | plen = sprintf(pkt, "CONNECT %s:%u HTTP/1.0\x0d\x0a" |
| 134 | "User-agent: libwebsockets\x0d\x0a" |
| 135 | /*Proxy-authorization: basic aGVsbG86d29ybGQ= */ |
| 136 | "\x0d\x0a", address, port); |
| 137 | |
| 138 | /* OK from now on we talk via the proxy */ |
| 139 | |
| 140 | address = this->http_proxy_address; |
| 141 | port = this->http_proxy_port; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * prepare the actual connection (to the proxy, if any) |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 146 | */ |
| 147 | |
| 148 | server_hostent = gethostbyname(address); |
| 149 | if (server_hostent == NULL) { |
| 150 | fprintf(stderr, "Unable to get host name from %s\n", address); |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 151 | goto oom4; |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | wsi->sock = socket(AF_INET, SOCK_STREAM, 0); |
Andy Green | 6964bb5 | 2011-01-23 16:50:33 +0000 | [diff] [blame] | 155 | |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 156 | if (wsi->sock < 0) { |
| 157 | fprintf(stderr, "Unable to open socket\n"); |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 158 | goto oom4; |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 159 | } |
| 160 | |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 161 | server_addr.sin_family = AF_INET; |
| 162 | server_addr.sin_port = htons(port); |
| 163 | server_addr.sin_addr = *((struct in_addr *)server_hostent->h_addr); |
| 164 | bzero(&server_addr.sin_zero, 8); |
| 165 | |
| 166 | if (connect(wsi->sock, (struct sockaddr *)&server_addr, |
| 167 | sizeof(struct sockaddr)) == -1) { |
Andy Green | 90c7cbc | 2011-01-27 06:26:52 +0000 | [diff] [blame] | 168 | fprintf(stderr, "Connect failed\n"); |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 169 | goto oom4; |
Andy Green | 6964bb5 | 2011-01-23 16:50:33 +0000 | [diff] [blame] | 170 | } |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 171 | |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 172 | /* into fd -> wsi hashtable */ |
| 173 | |
| 174 | insert_wsi(this, wsi); |
| 175 | |
| 176 | /* into internal poll list */ |
| 177 | |
| 178 | this->fds[this->fds_count].fd = wsi->sock; |
| 179 | this->fds[this->fds_count].revents = 0; |
| 180 | this->fds[this->fds_count++].events = POLLIN; |
| 181 | |
| 182 | /* external POLL support via protocol 0 */ |
| 183 | this->protocols[0].callback(this, wsi, |
| 184 | LWS_CALLBACK_ADD_POLL_FD, |
| 185 | (void *)(long)wsi->sock, NULL, POLLIN); |
| 186 | |
Andy Green | 9659f37 | 2011-01-27 22:01:43 +0000 | [diff] [blame] | 187 | /* we are connected to server, or proxy */ |
| 188 | |
Andy Green | 9659f37 | 2011-01-27 22:01:43 +0000 | [diff] [blame] | 189 | if (this->http_proxy_port) { |
| 190 | |
| 191 | n = send(wsi->sock, pkt, plen, 0); |
| 192 | if (n < 0) { |
Andy Green | 5b9a4c0 | 2011-01-28 09:39:29 +0000 | [diff] [blame] | 193 | close(wsi->sock); |
| 194 | fprintf(stderr, "ERROR writing to proxy socket\n"); |
| 195 | goto bail1; |
| 196 | } |
| 197 | |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 198 | libwebsocket_set_timeout(wsi, |
| 199 | PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE, 5); |
Andy Green | 5b9a4c0 | 2011-01-28 09:39:29 +0000 | [diff] [blame] | 200 | |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 201 | wsi->mode = LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY; |
Andy Green | 9659f37 | 2011-01-27 22:01:43 +0000 | [diff] [blame] | 202 | |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 203 | return wsi; |
Andy Green | 9659f37 | 2011-01-27 22:01:43 +0000 | [diff] [blame] | 204 | } |
| 205 | |
Andy Green | 6964bb5 | 2011-01-23 16:50:33 +0000 | [diff] [blame] | 206 | /* |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 207 | * provoke service to issue the handshake directly |
| 208 | * we need to do it this way because in the proxy case, this is the |
| 209 | * next state and executed only if and when we get a good proxy |
| 210 | * response inside the state machine |
Andy Green | 6964bb5 | 2011-01-23 16:50:33 +0000 | [diff] [blame] | 211 | */ |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 212 | |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 213 | wsi->mode = LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE; |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 214 | pfd.fd = wsi->sock; |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 215 | pfd.revents = POLLIN; |
| 216 | libwebsocket_service_fd(this, &pfd); |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 217 | |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 218 | return wsi; |
| 219 | |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 220 | oom4: |
| 221 | if (wsi->c_protocol) |
| 222 | free(wsi->c_protocol); |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 223 | |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 224 | oom3: |
Andy Green | 08d3392 | 2011-02-26 10:22:49 +0000 | [diff] [blame] | 225 | if (wsi->c_origin) |
| 226 | free(wsi->c_origin); |
Andy Green | be93fef | 2011-02-14 20:25:43 +0000 | [diff] [blame] | 227 | |
| 228 | oom2: |
| 229 | free(wsi->c_host); |
| 230 | |
| 231 | oom1: |
| 232 | free(wsi->c_path); |
| 233 | |
Andy Green | 4739e5c | 2011-01-22 12:51:57 +0000 | [diff] [blame] | 234 | bail1: |
| 235 | free(wsi); |
| 236 | |
| 237 | return NULL; |
| 238 | } |