Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 1 | /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| 2 | |
| 3 | /* |
| 4 | * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 5 | * (C) 2009 by on-waves.com |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <ctype.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <string.h> |
| 28 | #include <time.h> |
| 29 | #include <limits.h> |
| 30 | #include <unistd.h> |
| 31 | |
| 32 | #include <sys/socket.h> |
| 33 | #include <arpa/inet.h> |
| 34 | |
| 35 | #include <openbsc/debug.h> |
| 36 | #include <openbsc/msgb.h> |
| 37 | #include <openbsc/talloc.h> |
| 38 | #include <openbsc/gsm_data.h> |
| 39 | #include <openbsc/select.h> |
| 40 | #include <openbsc/mgcp.h> |
Holger Hans Peter Freyther | 3adc628 | 2009-11-19 15:03:39 +0100 | [diff] [blame] | 41 | #include <openbsc/telnet_interface.h> |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 42 | |
| 43 | #include <vty/command.h> |
| 44 | #include <vty/vty.h> |
| 45 | |
| 46 | /* this is here for the vty... it will never be called */ |
| 47 | void subscr_put() { abort(); } |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 48 | |
| 49 | #define _GNU_SOURCE |
| 50 | #include <getopt.h> |
| 51 | |
| 52 | #warning "Make use of the rtp proxy code" |
| 53 | |
| 54 | static int source_port = 2427; |
| 55 | static const char *local_ip = NULL; |
| 56 | static const char *source_addr = "0.0.0.0"; |
| 57 | static struct bsc_fd bfd; |
Holger Hans Peter Freyther | d5607c7 | 2009-11-20 11:10:31 +0100 | [diff] [blame] | 58 | static unsigned int number_endpoints = 0; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 59 | static const char *bts_ip = NULL; |
| 60 | static struct in_addr bts_in; |
| 61 | static int first_request = 1; |
| 62 | static const char *audio_name = "GSM-EFR/8000"; |
| 63 | static int audio_payload = 97; |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 64 | static int audio_loop = 0; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 65 | static int early_bind = 0; |
| 66 | |
| 67 | static char *config_file = "mgcp.cfg"; |
| 68 | |
| 69 | /* used by msgb and mgcp */ |
| 70 | void *tall_bsc_ctx = NULL; |
| 71 | |
| 72 | enum mgcp_connection_mode { |
| 73 | MGCP_CONN_NONE = 0, |
| 74 | MGCP_CONN_RECV_ONLY = 1, |
| 75 | MGCP_CONN_SEND_ONLY = 2, |
| 76 | MGCP_CONN_RECV_SEND = MGCP_CONN_RECV_ONLY | MGCP_CONN_SEND_ONLY, |
| 77 | }; |
| 78 | |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 79 | enum { |
| 80 | DEST_NETWORK = 0, |
| 81 | DEST_BTS = 1, |
| 82 | }; |
| 83 | |
| 84 | enum { |
| 85 | PROTO_RTP, |
| 86 | PROTO_RTCP, |
| 87 | }; |
| 88 | |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 89 | #define CI_UNUSED 0 |
| 90 | static unsigned int last_call_id = 0; |
| 91 | |
| 92 | struct mgcp_endpoint { |
| 93 | int ci; |
| 94 | char *callid; |
| 95 | char *local_options; |
| 96 | int conn_mode; |
| 97 | |
| 98 | /* the local rtp port */ |
| 99 | int rtp_port; |
| 100 | |
| 101 | /* |
| 102 | * RTP mangling: |
| 103 | * - we get RTP and RTCP to us and need to forward to the BTS |
| 104 | * - we get RTP and RTCP from the BTS and forward to the network |
| 105 | */ |
| 106 | struct bsc_fd local_rtp; |
| 107 | struct bsc_fd local_rtcp; |
| 108 | |
| 109 | struct in_addr remote; |
| 110 | |
| 111 | /* in network byte order */ |
| 112 | int rtp, rtcp; |
| 113 | int bts_rtp, bts_rtcp; |
| 114 | }; |
| 115 | |
| 116 | static struct mgcp_endpoint *endpoints = NULL; |
| 117 | #define ENDPOINT_NUMBER(endp) abs(endp - endpoints) |
| 118 | |
| 119 | /** |
| 120 | * Macro for tokenizing MGCP messages and SDP in one go. |
| 121 | * |
| 122 | */ |
| 123 | #define MSG_TOKENIZE_START \ |
| 124 | line_start = 0; \ |
| 125 | for (i = 0; i < msgb_l3len(msg); ++i) { \ |
| 126 | /* we have a line end */ \ |
| 127 | if (msg->l3h[i] == '\n') { \ |
| 128 | /* skip the first line */ \ |
| 129 | if (line_start == 0) { \ |
| 130 | line_start = i + 1; \ |
| 131 | continue; \ |
| 132 | } \ |
| 133 | \ |
| 134 | /* check if we have a proper param */ \ |
| 135 | if (i - line_start == 1 && msg->l3h[line_start] == '\r') { \ |
| 136 | } else if (i - line_start > 2 \ |
| 137 | && islower(msg->l3h[line_start]) \ |
| 138 | && msg->l3h[line_start + 1] == '=') { \ |
| 139 | } else if (i - line_start < 3 \ |
| 140 | || msg->l3h[line_start + 1] != ':' \ |
| 141 | || msg->l3h[line_start + 2] != ' ') \ |
| 142 | goto error; \ |
| 143 | \ |
| 144 | msg->l3h[i] = '\0'; \ |
| 145 | if (msg->l3h[i-1] == '\r') \ |
| 146 | msg->l3h[i-1] = '\0'; |
| 147 | |
| 148 | #define MSG_TOKENIZE_END \ |
| 149 | line_start = i + 1; \ |
| 150 | } \ |
| 151 | } |
| 152 | |
| 153 | |
| 154 | struct mgcp_msg_ptr { |
| 155 | unsigned int start; |
| 156 | unsigned int length; |
| 157 | }; |
| 158 | |
| 159 | struct mgcp_request { |
| 160 | char *name; |
| 161 | void (*handle_request) (struct msgb *msg, struct sockaddr_in *source); |
| 162 | char *debug_name; |
| 163 | }; |
| 164 | |
| 165 | #define MGCP_REQUEST(NAME, REQ, DEBUG_NAME) \ |
| 166 | { .name = NAME, .handle_request = REQ, .debug_name = DEBUG_NAME }, |
| 167 | |
| 168 | static void handle_audit_endpoint(struct msgb *msg, struct sockaddr_in *source); |
| 169 | static void handle_create_con(struct msgb *msg, struct sockaddr_in *source); |
| 170 | static void handle_delete_con(struct msgb *msg, struct sockaddr_in *source); |
| 171 | static void handle_modify_con(struct msgb *msg, struct sockaddr_in *source); |
| 172 | |
| 173 | static int generate_call_id() |
| 174 | { |
| 175 | int i; |
| 176 | |
| 177 | /* use the call id */ |
| 178 | ++last_call_id; |
| 179 | |
| 180 | /* handle wrap around */ |
| 181 | if (last_call_id == CI_UNUSED) |
| 182 | ++last_call_id; |
| 183 | |
| 184 | /* callstack can only be of size number_of_endpoints */ |
| 185 | /* verify that the call id is free, e.g. in case of overrun */ |
| 186 | for (i = 1; i < number_endpoints; ++i) |
| 187 | if (endpoints[i].ci == last_call_id) |
| 188 | return generate_call_id(); |
| 189 | |
| 190 | return last_call_id; |
| 191 | } |
| 192 | |
| 193 | /* FIXIME/TODO: need to have a list of pending transactions and check that */ |
| 194 | static unsigned int generate_transaction_id() |
| 195 | { |
| 196 | return abs(rand()); |
| 197 | } |
| 198 | |
| 199 | static int _send(int fd, struct in_addr *addr, int port, char *buf, int len) |
| 200 | { |
| 201 | struct sockaddr_in out; |
| 202 | out.sin_family = AF_INET; |
| 203 | out.sin_port = port; |
| 204 | memcpy(&out.sin_addr, addr, sizeof(*addr)); |
| 205 | |
| 206 | return sendto(fd, buf, len, 0, (struct sockaddr *)&out, sizeof(out)); |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * There is data coming. We will have to figure out if it |
| 211 | * came from the BTS or the MediaGateway of the MSC. On top |
| 212 | * of that we need to figure out if it was RTP or RTCP. |
| 213 | * |
| 214 | * Currently we do not communicate with the BSC so we have |
| 215 | * no idea where the BTS is listening for RTP and need to |
| 216 | * do the classic routing trick. Wait for the first packet |
| 217 | * from the BTS and then go ahead. |
| 218 | */ |
| 219 | static int rtp_data_cb(struct bsc_fd *fd, unsigned int what) |
| 220 | { |
| 221 | char buf[4096]; |
| 222 | struct sockaddr_in addr; |
| 223 | socklen_t slen = sizeof(addr); |
| 224 | struct mgcp_endpoint *endp; |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 225 | int rc, dest, proto; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 226 | |
| 227 | endp = (struct mgcp_endpoint *) fd->data; |
| 228 | |
| 229 | rc = recvfrom(fd->fd, &buf, sizeof(buf), 0, |
| 230 | (struct sockaddr *) &addr, &slen); |
| 231 | if (rc < 0) { |
| 232 | DEBUGP(DMGCP, "Failed to receive message on: 0x%x\n", |
| 233 | ENDPOINT_NUMBER(endp)); |
| 234 | return -1; |
| 235 | } |
| 236 | |
Holger Hans Peter Freyther | 1006fac | 2009-11-19 16:04:10 +0100 | [diff] [blame] | 237 | /* do not forward aynthing... maybe there is a packet from the bts */ |
| 238 | if (endp->ci == CI_UNUSED) |
| 239 | return -1; |
| 240 | |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 241 | /* |
| 242 | * Figure out where to forward it to. This code assumes that we |
| 243 | * have received the Connection Modify and know who is a legitimate |
| 244 | * partner. According to the spec we could attempt to forward even |
| 245 | * after the Create Connection but we will not as we are not really |
| 246 | * able to tell if this is legitimate. |
| 247 | */ |
| 248 | #warning "Slight spec violation. With connection mode recvonly we should attempt to forward." |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 249 | dest = memcmp(&addr.sin_addr, &endp->remote, sizeof(addr.sin_addr)) == 0 |
| 250 | ? DEST_BTS : DEST_NETWORK; |
| 251 | proto = fd == &endp->local_rtp ? PROTO_RTP : PROTO_RTCP; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 252 | |
| 253 | /* We have no idea who called us, maybe it is the BTS. */ |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 254 | if (dest == DEST_NETWORK && endp->bts_rtp == 0) { |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 255 | /* it was the BTS... */ |
| 256 | if (memcmp(&addr.sin_addr, &bts_in, sizeof(bts_in)) == 0) { |
| 257 | if (fd == &endp->local_rtp) { |
| 258 | endp->bts_rtp = addr.sin_port; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 259 | } else { |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 260 | endp->bts_rtcp = addr.sin_port; |
| 261 | } |
| 262 | |
Holger Hans Peter Freyther | ba7bf57 | 2009-11-19 16:25:53 +0100 | [diff] [blame] | 263 | DEBUGP(DMGCP, "Found BTS for endpoint: 0x%x on port: %d/%d\n", |
| 264 | ENDPOINT_NUMBER(endp), ntohs(endp->bts_rtp), ntohs(endp->bts_rtcp)); |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 265 | } |
| 266 | } |
| 267 | |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 268 | /* dispatch */ |
| 269 | if (audio_loop) |
| 270 | dest = !dest; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 271 | |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 272 | if (dest == DEST_NETWORK) { |
| 273 | return _send(fd->fd, &endp->remote, |
| 274 | proto == PROTO_RTP ? endp->rtp : endp->rtcp, |
| 275 | buf, rc); |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 276 | } else { |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 277 | return _send(fd->fd, &bts_in, |
| 278 | proto == PROTO_RTP ? endp->bts_rtp : endp->bts_rtcp, |
| 279 | buf, rc); |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 280 | } |
| 281 | } |
| 282 | |
| 283 | static int create_bind(struct bsc_fd *fd, int port) |
| 284 | { |
| 285 | struct sockaddr_in addr; |
| 286 | int on = 1; |
| 287 | |
| 288 | fd->fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 289 | if (fd->fd < 0) |
| 290 | return -1; |
| 291 | |
| 292 | setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 293 | memset(&addr, 0, sizeof(addr)); |
| 294 | addr.sin_family = AF_INET; |
| 295 | addr.sin_port = htons(port); |
| 296 | inet_aton(source_addr, &addr.sin_addr); |
| 297 | |
| 298 | if (bind(fd->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) |
| 299 | return -1; |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | static int bind_rtp(struct mgcp_endpoint *endp) |
| 305 | { |
| 306 | /* set to zero until we get the info */ |
| 307 | memset(&endp->remote, 0, sizeof(endp->remote)); |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 308 | |
| 309 | if (create_bind(&endp->local_rtp, endp->rtp_port) != 0) { |
| 310 | DEBUGP(DMGCP, "Failed to create RTP port: %d on 0x%x\n", |
| 311 | endp->rtp_port, ENDPOINT_NUMBER(endp)); |
| 312 | goto cleanup0; |
| 313 | } |
| 314 | |
| 315 | if (create_bind(&endp->local_rtcp, endp->rtp_port + 1) != 0) { |
| 316 | DEBUGP(DMGCP, "Failed to create RTCP port: %d on 0x%x\n", |
| 317 | endp->rtp_port + 1, ENDPOINT_NUMBER(endp)); |
| 318 | goto cleanup1; |
| 319 | } |
| 320 | |
| 321 | endp->local_rtp.cb = rtp_data_cb; |
| 322 | endp->local_rtp.data = endp; |
| 323 | endp->local_rtp.when = BSC_FD_READ; |
| 324 | if (bsc_register_fd(&endp->local_rtp) != 0) { |
| 325 | DEBUGP(DMGCP, "Failed to register RTP port %d on 0x%x\n", |
| 326 | endp->rtp_port, ENDPOINT_NUMBER(endp)); |
| 327 | goto cleanup2; |
| 328 | } |
| 329 | |
| 330 | endp->local_rtcp.cb = rtp_data_cb; |
| 331 | endp->local_rtcp.data = endp; |
| 332 | endp->local_rtcp.when = BSC_FD_READ; |
| 333 | if (bsc_register_fd(&endp->local_rtcp) != 0) { |
| 334 | DEBUGP(DMGCP, "Failed to register RTCP port %d on 0x%x\n", |
| 335 | endp->rtp_port + 1, ENDPOINT_NUMBER(endp)); |
| 336 | goto cleanup3; |
| 337 | } |
| 338 | |
| 339 | return 0; |
| 340 | |
| 341 | cleanup3: |
| 342 | bsc_unregister_fd(&endp->local_rtp); |
| 343 | cleanup2: |
| 344 | close(endp->local_rtcp.fd); |
| 345 | endp->local_rtcp.fd = -1; |
| 346 | cleanup1: |
| 347 | close(endp->local_rtp.fd); |
| 348 | endp->local_rtp.fd = -1; |
| 349 | cleanup0: |
| 350 | return -1; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * array of function pointers for handling various |
| 355 | * messages. In the future this might be binary sorted |
| 356 | * for performance reasons. |
| 357 | */ |
| 358 | static const struct mgcp_request mgcp_requests [] = { |
| 359 | MGCP_REQUEST("AUEP", handle_audit_endpoint, "AuditEndpoint") |
| 360 | MGCP_REQUEST("CRCX", handle_create_con, "CreateConnection") |
| 361 | MGCP_REQUEST("DLCX", handle_delete_con, "DeleteConnection") |
| 362 | MGCP_REQUEST("MDCX", handle_modify_con, "ModifiyConnection") |
| 363 | }; |
| 364 | |
| 365 | static void send_response_with_data(int code, const char *msg, const char *trans, |
| 366 | const char *data, struct sockaddr_in *source) |
| 367 | { |
| 368 | char buf[4096]; |
| 369 | int len; |
| 370 | |
| 371 | if (data) { |
| 372 | len = snprintf(buf, sizeof(buf), "%d %s\n%s", code, trans, data); |
| 373 | } else { |
| 374 | len = snprintf(buf, sizeof(buf), "%d %s\n", code, trans); |
| 375 | } |
| 376 | DEBUGP(DMGCP, "Sending response: code: %d for '%s'\n", code, msg); |
| 377 | |
| 378 | sendto(bfd.fd, buf, len, 0, (struct sockaddr *)source, sizeof(*source)); |
| 379 | } |
| 380 | |
| 381 | static void send_response(int code, const char *msg, const char *trans, struct sockaddr_in *source) |
| 382 | { |
| 383 | send_response_with_data(code, msg, trans, NULL, source); |
| 384 | } |
| 385 | |
| 386 | static void send_with_sdp(struct mgcp_endpoint *endp, const char *msg, const char *trans_id, struct sockaddr_in *source) |
| 387 | { |
| 388 | const char *addr = local_ip; |
| 389 | char sdp_record[4096]; |
| 390 | |
| 391 | if (!addr) |
| 392 | addr = source_addr; |
| 393 | |
| 394 | snprintf(sdp_record, sizeof(sdp_record) - 1, |
| 395 | "I: %d\n\n" |
| 396 | "v=0\r\n" |
| 397 | "c=IN IP4 %s\r\n" |
| 398 | "m=audio %d RTP/AVP %d\r\n" |
| 399 | "a=rtpmap:%d %s\r\n", |
| 400 | endp->ci, addr, endp->rtp_port, |
| 401 | audio_payload, audio_payload, audio_name); |
| 402 | return send_response_with_data(200, msg, trans_id, sdp_record, source); |
| 403 | } |
| 404 | |
| 405 | /* send a static record */ |
| 406 | static void send_rsip(struct sockaddr_in *source) |
| 407 | { |
| 408 | char reset[4096]; |
| 409 | int len, rc; |
| 410 | |
| 411 | len = snprintf(reset, sizeof(reset) - 1, |
| 412 | "RSIP %u *@mgw MGCP 1.0\n" |
| 413 | "RM: restart\n", generate_transaction_id()); |
| 414 | rc = sendto(bfd.fd, reset, len, 0, (struct sockaddr *) source, sizeof(*source)); |
| 415 | if (rc < 0) { |
| 416 | DEBUGP(DMGCP, "Failed to send RSIP: %d\n", rc); |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * handle incoming messages: |
| 422 | * - this can be a command (four letters, space, transaction id) |
| 423 | * - or a response (three numbers, space, transaction id) |
| 424 | */ |
| 425 | static void handle_message(struct msgb *msg, struct sockaddr_in *source) |
| 426 | { |
| 427 | int code; |
| 428 | |
| 429 | if (msg->len < 4) { |
| 430 | DEBUGP(DMGCP, "mgs too short: %d\n", msg->len); |
| 431 | return; |
| 432 | } |
| 433 | |
| 434 | /* attempt to treat it as a response */ |
| 435 | if (sscanf((const char *)&msg->data[0], "%3d %*s", &code) == 1) { |
| 436 | DEBUGP(DMGCP, "Response: Code: %d\n", code); |
| 437 | } else { |
| 438 | int i, handled = 0; |
| 439 | msg->l3h = &msg->l2h[4]; |
| 440 | for (i = 0; i < ARRAY_SIZE(mgcp_requests); ++i) |
| 441 | if (strncmp(mgcp_requests[i].name, (const char *) &msg->data[0], 4) == 0) { |
| 442 | handled = 1; |
| 443 | mgcp_requests[i].handle_request(msg, source); |
| 444 | } |
| 445 | if (!handled) { |
| 446 | DEBUGP(DMGCP, "MSG with type: '%.4s' not handled\n", &msg->data[0]); |
| 447 | } |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | /* string tokenizer for the poor */ |
| 452 | static int find_msg_pointers(struct msgb *msg, struct mgcp_msg_ptr *ptrs, int ptrs_length) |
| 453 | { |
| 454 | int i, found = 0; |
| 455 | |
| 456 | int whitespace = 1; |
| 457 | for (i = 0; i < msgb_l3len(msg) && ptrs_length > 0; ++i) { |
| 458 | /* if we have a space we found an end */ |
| 459 | if (msg->l3h[i] == ' ' || msg->l3h[i] == '\r' || msg->l3h[i] == '\n') { |
| 460 | if (!whitespace) { |
| 461 | ++found; |
| 462 | whitespace = 1; |
| 463 | ptrs->length = i - ptrs->start - 1; |
| 464 | ++ptrs; |
| 465 | --ptrs_length; |
| 466 | } else { |
| 467 | /* skip any number of whitespace */ |
| 468 | } |
| 469 | |
| 470 | /* line end... stop */ |
| 471 | if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n') |
| 472 | break; |
| 473 | } else if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n') { |
| 474 | /* line end, be done */ |
| 475 | break; |
| 476 | } else if (whitespace) { |
| 477 | whitespace = 0; |
| 478 | ptrs->start = i; |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | if (ptrs_length == 0) |
| 483 | return -1; |
| 484 | return found; |
| 485 | } |
| 486 | |
| 487 | static struct mgcp_endpoint *find_endpoint(const char *mgcp) |
| 488 | { |
| 489 | char *endptr = NULL; |
| 490 | unsigned int gw = INT_MAX; |
| 491 | |
| 492 | gw = strtoul(mgcp, &endptr, 16); |
| 493 | if (gw == 0 || gw >= number_endpoints || strcmp(endptr, "@mgw") != 0) { |
| 494 | DEBUGP(DMGCP, "Not able to find endpoint: '%s'\n", mgcp); |
| 495 | return NULL; |
| 496 | } |
| 497 | |
| 498 | return &endpoints[gw]; |
| 499 | } |
| 500 | |
| 501 | static int analyze_header(struct msgb *msg, struct mgcp_msg_ptr *ptr, int size, |
| 502 | const char **transaction_id, struct mgcp_endpoint **endp) |
| 503 | { |
| 504 | int found; |
| 505 | |
| 506 | if (size < 3) { |
| 507 | DEBUGP(DMGCP, "Not enough space in ptr\n"); |
| 508 | return -1; |
| 509 | } |
| 510 | |
| 511 | found = find_msg_pointers(msg, ptr, size); |
| 512 | |
| 513 | if (found < 3) { |
| 514 | DEBUGP(DMGCP, "Gateway: Not enough params. Found: %d\n", found); |
| 515 | return -1; |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * replace the space with \0. the main method gurantess that |
| 520 | * we still have + 1 for null termination |
| 521 | */ |
| 522 | msg->l3h[ptr[3].start + ptr[3].length + 1] = '\0'; |
| 523 | msg->l3h[ptr[2].start + ptr[2].length + 1] = '\0'; |
| 524 | msg->l3h[ptr[1].start + ptr[1].length + 1] = '\0'; |
| 525 | msg->l3h[ptr[0].start + ptr[0].length + 1] = '\0'; |
| 526 | |
| 527 | if (strncmp("1.0", (const char *)&msg->l3h[ptr[3].start], 3) != 0 |
| 528 | || strncmp("MGCP", (const char *)&msg->l3h[ptr[2].start], 4) != 0) { |
| 529 | DEBUGP(DMGCP, "Wrong MGCP version. Not handling: '%s' '%s'\n", |
| 530 | (const char *)&msg->l3h[ptr[3].start], |
| 531 | (const char *)&msg->l3h[ptr[2].start]); |
| 532 | return -1; |
| 533 | } |
| 534 | |
| 535 | *transaction_id = (const char *)&msg->l3h[ptr[0].start]; |
| 536 | *endp = find_endpoint((const char *)&msg->l3h[ptr[1].start]); |
| 537 | return *endp == NULL; |
| 538 | } |
| 539 | |
| 540 | static int verify_call_id(const struct mgcp_endpoint *endp, |
| 541 | const char *callid) |
| 542 | { |
| 543 | if (strcmp(endp->callid, callid) != 0) { |
| 544 | DEBUGP(DMGCP, "CallIDs does not match on 0x%x. '%s' != '%s'\n", |
| 545 | ENDPOINT_NUMBER(endp), endp->callid, callid); |
| 546 | return -1; |
| 547 | } |
| 548 | |
| 549 | return 0; |
| 550 | } |
| 551 | |
| 552 | static int verify_ci(const struct mgcp_endpoint *endp, |
| 553 | const char *ci) |
| 554 | { |
| 555 | if (atoi(ci) != endp->ci) { |
| 556 | DEBUGP(DMGCP, "ConnectionIdentifiers do not match on 0x%x. %d != %s\n", |
| 557 | ENDPOINT_NUMBER(endp), endp->ci, ci); |
| 558 | return -1; |
| 559 | } |
| 560 | |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | static void handle_audit_endpoint(struct msgb *msg, struct sockaddr_in *source) |
| 565 | { |
| 566 | struct mgcp_msg_ptr data_ptrs[6]; |
| 567 | int found, response; |
| 568 | const char *trans_id; |
| 569 | struct mgcp_endpoint *endp; |
| 570 | |
| 571 | found = analyze_header(msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp); |
| 572 | if (found != 0) |
| 573 | response = 500; |
| 574 | else |
| 575 | response = 200; |
| 576 | |
| 577 | return send_response(response, "AUEP", trans_id, source); |
| 578 | } |
| 579 | |
| 580 | static int parse_conn_mode(const char* msg, int *conn_mode) |
| 581 | { |
| 582 | int ret = 0; |
| 583 | if (strcmp(msg, "recvonly") == 0) |
| 584 | *conn_mode = MGCP_CONN_RECV_ONLY; |
| 585 | else if (strcmp(msg, "sendrecv") == 0) |
| 586 | *conn_mode = MGCP_CONN_RECV_SEND; |
| 587 | else { |
| 588 | DEBUGP(DMGCP, "Unknown connection mode: '%s'\n", msg); |
| 589 | ret = -1; |
| 590 | } |
| 591 | |
| 592 | return ret; |
| 593 | } |
| 594 | |
| 595 | static void handle_create_con(struct msgb *msg, struct sockaddr_in *source) |
| 596 | { |
| 597 | struct mgcp_msg_ptr data_ptrs[6]; |
| 598 | int found, i, line_start; |
| 599 | const char *trans_id; |
| 600 | struct mgcp_endpoint *endp; |
| 601 | int error_code = 500; |
| 602 | |
| 603 | found = analyze_header(msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp); |
| 604 | if (found != 0) |
| 605 | return send_response(500, "CRCX", trans_id, source); |
| 606 | |
| 607 | if (endp->ci != CI_UNUSED) { |
| 608 | DEBUGP(DMGCP, "Endpoint is already used. 0x%x\n", ENDPOINT_NUMBER(endp)); |
| 609 | return send_response(500, "CRCX", trans_id, source); |
| 610 | } |
| 611 | |
| 612 | /* parse CallID C: and LocalParameters L: */ |
| 613 | MSG_TOKENIZE_START |
| 614 | switch (msg->l3h[line_start]) { |
| 615 | case 'L': |
| 616 | endp->local_options = talloc_strdup(endpoints, |
| 617 | (const char *)&msg->l3h[line_start + 3]); |
| 618 | break; |
| 619 | case 'C': |
| 620 | endp->callid = talloc_strdup(endpoints, |
| 621 | (const char *)&msg->l3h[line_start + 3]); |
| 622 | break; |
| 623 | case 'M': |
| 624 | if (parse_conn_mode((const char *)&msg->l3h[line_start + 3], |
| 625 | &endp->conn_mode) != 0) { |
| 626 | error_code = 517; |
| 627 | goto error2; |
| 628 | } |
| 629 | break; |
| 630 | default: |
| 631 | DEBUGP(DMGCP, "Unhandled option: '%c'/%d on 0x%x\n", |
| 632 | msg->l3h[line_start], msg->l3h[line_start], |
| 633 | ENDPOINT_NUMBER(endp)); |
| 634 | break; |
| 635 | } |
| 636 | MSG_TOKENIZE_END |
| 637 | |
Holger Hans Peter Freyther | 1006fac | 2009-11-19 16:04:10 +0100 | [diff] [blame] | 638 | /* initialize */ |
| 639 | endp->rtp = endp->rtcp = endp->bts_rtp = endp->bts_rtcp = 0; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 640 | |
| 641 | /* bind to the port now */ |
| 642 | endp->rtp_port = rtp_calculate_port(ENDPOINT_NUMBER(endp), rtp_base_port); |
| 643 | if (!early_bind && bind_rtp(endp) != 0) |
| 644 | goto error2; |
| 645 | |
| 646 | /* assign a local call identifier or fail */ |
| 647 | endp->ci = generate_call_id(); |
| 648 | if (endp->ci == CI_UNUSED) |
| 649 | goto error2; |
| 650 | |
| 651 | DEBUGP(DMGCP, "Creating endpoint on: 0x%x CI: %u port: %u\n", |
| 652 | ENDPOINT_NUMBER(endp), endp->ci, endp->rtp_port); |
| 653 | return send_with_sdp(endp, "CRCX", trans_id, source); |
| 654 | error: |
| 655 | DEBUGP(DMGCP, "Malformed line: %s on 0x%x with: line_start: %d %d\n", |
| 656 | hexdump(msg->l3h, msgb_l3len(msg)), |
| 657 | ENDPOINT_NUMBER(endp), line_start, i); |
| 658 | return send_response(error_code, "CRCX", trans_id, source); |
| 659 | |
| 660 | error2: |
| 661 | DEBUGP(DMGCP, "Resource error on 0x%x\n", ENDPOINT_NUMBER(endp)); |
| 662 | return send_response(error_code, "CRCX", trans_id, source); |
| 663 | } |
| 664 | |
| 665 | static void handle_modify_con(struct msgb *msg, struct sockaddr_in *source) |
| 666 | { |
| 667 | struct mgcp_msg_ptr data_ptrs[6]; |
| 668 | int found, i, line_start; |
| 669 | const char *trans_id; |
| 670 | struct mgcp_endpoint *endp; |
| 671 | int error_code = 500; |
| 672 | |
| 673 | found = analyze_header(msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp); |
| 674 | if (found != 0) |
| 675 | return send_response(error_code, "MDCX", trans_id, source); |
| 676 | |
| 677 | if (endp->ci == CI_UNUSED) { |
| 678 | DEBUGP(DMGCP, "Endpoint is not holding a connection. 0x%x\n", ENDPOINT_NUMBER(endp)); |
| 679 | return send_response(error_code, "MDCX", trans_id, source); |
| 680 | } |
| 681 | |
| 682 | MSG_TOKENIZE_START |
| 683 | switch (msg->l3h[line_start]) { |
| 684 | case 'C': { |
| 685 | if (verify_call_id(endp, (const char *)&msg->l3h[line_start + 3]) != 0) |
| 686 | goto error3; |
| 687 | break; |
| 688 | } |
| 689 | case 'I': { |
| 690 | if (verify_ci(endp, (const char *)&msg->l3h[line_start + 3]) != 0) |
| 691 | goto error3; |
| 692 | break; |
| 693 | } |
| 694 | case 'L': |
| 695 | /* skip */ |
| 696 | break; |
| 697 | case 'M': |
| 698 | if (parse_conn_mode((const char *)&msg->l3h[line_start + 3], |
| 699 | &endp->conn_mode) != 0) { |
| 700 | error_code = 517; |
| 701 | goto error3; |
| 702 | } |
| 703 | break; |
| 704 | case '\0': |
| 705 | /* SDP file begins */ |
| 706 | break; |
| 707 | case 'a': |
| 708 | case 'o': |
| 709 | case 's': |
| 710 | case 't': |
| 711 | case 'v': |
| 712 | /* skip these SDP attributes */ |
| 713 | break; |
| 714 | case 'm': { |
| 715 | int port; |
| 716 | const char *param = (const char *)&msg->l3h[line_start]; |
| 717 | |
| 718 | if (sscanf(param, "m=audio %d RTP/AVP %*d", &port) == 1) { |
| 719 | endp->rtp = htons(port); |
| 720 | endp->rtcp = htons(port + 1); |
| 721 | } |
| 722 | break; |
| 723 | } |
| 724 | case 'c': { |
| 725 | char ipv4[16]; |
| 726 | const char *param = (const char *)&msg->l3h[line_start]; |
| 727 | |
| 728 | if (sscanf(param, "c=IN IP4 %15s", ipv4) == 1) { |
| 729 | inet_aton(ipv4, &endp->remote); |
| 730 | } |
| 731 | break; |
| 732 | } |
| 733 | default: |
| 734 | DEBUGP(DMGCP, "Unhandled option: '%c'/%d on 0x%x\n", |
| 735 | msg->l3h[line_start], msg->l3h[line_start], |
| 736 | ENDPOINT_NUMBER(endp)); |
| 737 | break; |
| 738 | } |
| 739 | MSG_TOKENIZE_END |
| 740 | |
| 741 | /* modify */ |
| 742 | DEBUGP(DMGCP, "Modified endpoint on: 0x%x Server: %s:%u\n", |
| 743 | ENDPOINT_NUMBER(endp), inet_ntoa(endp->remote), endp->rtp); |
| 744 | return send_with_sdp(endp, "MDCX", trans_id, source); |
| 745 | |
| 746 | error: |
| 747 | DEBUGP(DMGCP, "Malformed line: %s on 0x%x with: line_start: %d %d %d\n", |
| 748 | hexdump(msg->l3h, msgb_l3len(msg)), |
| 749 | ENDPOINT_NUMBER(endp), line_start, i, msg->l3h[line_start]); |
| 750 | return send_response(error_code, "MDCX", trans_id, source); |
| 751 | |
| 752 | error3: |
| 753 | return send_response(error_code, "MDCX", trans_id, source); |
| 754 | } |
| 755 | |
| 756 | static void handle_delete_con(struct msgb *msg, struct sockaddr_in *source) |
| 757 | { |
| 758 | struct mgcp_msg_ptr data_ptrs[6]; |
| 759 | int found, i, line_start; |
| 760 | const char *trans_id; |
| 761 | struct mgcp_endpoint *endp; |
| 762 | int error_code = 500; |
| 763 | |
| 764 | found = analyze_header(msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp); |
| 765 | if (found != 0) |
| 766 | return send_response(error_code, "DLCX", trans_id, source); |
| 767 | |
| 768 | if (endp->ci == CI_UNUSED) { |
| 769 | DEBUGP(DMGCP, "Endpoint is not used. 0x%x\n", ENDPOINT_NUMBER(endp)); |
| 770 | return send_response(error_code, "DLCX", trans_id, source); |
| 771 | } |
| 772 | |
| 773 | MSG_TOKENIZE_START |
| 774 | switch (msg->l3h[line_start]) { |
| 775 | case 'C': { |
| 776 | if (verify_call_id(endp, (const char *)&msg->l3h[line_start + 3]) != 0) |
| 777 | goto error3; |
| 778 | break; |
| 779 | } |
| 780 | case 'I': { |
| 781 | if (verify_ci(endp, (const char *)&msg->l3h[line_start + 3]) != 0) |
| 782 | goto error3; |
| 783 | break; |
| 784 | } |
| 785 | default: |
| 786 | DEBUGP(DMGCP, "Unhandled option: '%c'/%d on 0x%x\n", |
| 787 | msg->l3h[line_start], msg->l3h[line_start], |
| 788 | ENDPOINT_NUMBER(endp)); |
| 789 | break; |
| 790 | } |
| 791 | MSG_TOKENIZE_END |
| 792 | |
| 793 | |
| 794 | /* free the connection */ |
| 795 | DEBUGP(DMGCP, "Deleting endpoint on: 0x%x\n", ENDPOINT_NUMBER(endp)); |
| 796 | endp->ci= CI_UNUSED; |
| 797 | talloc_free(endp->callid); |
| 798 | talloc_free(endp->local_options); |
| 799 | |
| 800 | if (!early_bind) { |
| 801 | bsc_unregister_fd(&endp->local_rtp); |
| 802 | bsc_unregister_fd(&endp->local_rtcp); |
| 803 | } |
| 804 | |
Holger Hans Peter Freyther | 1006fac | 2009-11-19 16:04:10 +0100 | [diff] [blame] | 805 | endp->rtp = endp->rtcp = endp->bts_rtp = endp->bts_rtcp = 0; |
| 806 | |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 807 | return send_response(250, "DLCX", trans_id, source); |
| 808 | |
| 809 | error: |
| 810 | DEBUGP(DMGCP, "Malformed line: %s on 0x%x with: line_start: %d %d\n", |
| 811 | hexdump(msg->l3h, msgb_l3len(msg)), |
| 812 | ENDPOINT_NUMBER(endp), line_start, i); |
| 813 | return send_response(error_code, "DLCX", trans_id, source); |
| 814 | |
| 815 | error3: |
| 816 | return send_response(error_code, "DLCX", trans_id, source); |
| 817 | } |
| 818 | |
| 819 | static void print_help() |
| 820 | { |
| 821 | printf("Some useful help...\n"); |
| 822 | printf(" -h --help is printing this text.\n"); |
| 823 | printf(" -c --config-file filename The config file to use.\n"); |
| 824 | } |
| 825 | |
| 826 | static void handle_options(int argc, char** argv) |
| 827 | { |
| 828 | while (1) { |
| 829 | int option_index = 0, c; |
| 830 | static struct option long_options[] = { |
| 831 | {"help", 0, 0, 'h'}, |
| 832 | {"config-file", 1, 0, 'c'}, |
| 833 | {0, 0, 0, 0}, |
| 834 | }; |
| 835 | |
| 836 | c = getopt_long(argc, argv, "hc:", long_options, &option_index); |
| 837 | |
| 838 | if (c == -1) |
| 839 | break; |
| 840 | |
| 841 | switch(c) { |
| 842 | case 'h': |
| 843 | print_help(); |
| 844 | exit(0); |
| 845 | break; |
| 846 | case 'c': |
| 847 | config_file = talloc_strdup(tall_bsc_ctx, optarg); |
| 848 | break; |
| 849 | default: |
| 850 | /* ignore */ |
| 851 | break; |
| 852 | }; |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | static int read_call_agent(struct bsc_fd *fd, unsigned int what) |
| 857 | { |
| 858 | struct sockaddr_in addr; |
| 859 | socklen_t slen = sizeof(addr); |
| 860 | struct msgb *msg; |
| 861 | |
| 862 | msg = (struct msgb *) fd->data; |
| 863 | |
| 864 | /* read one less so we can use it as a \0 */ |
| 865 | int rc = recvfrom(bfd.fd, msg->data, msg->data_len - 1, 0, |
| 866 | (struct sockaddr *) &addr, &slen); |
| 867 | if (rc < 0) { |
| 868 | perror("Gateway failed to read"); |
| 869 | return -1; |
| 870 | } else if (slen > sizeof(addr)) { |
| 871 | fprintf(stderr, "Gateway received message from outerspace: %d %d\n", |
| 872 | slen, sizeof(addr)); |
| 873 | return -1; |
| 874 | } |
| 875 | |
| 876 | if (first_request) { |
| 877 | first_request = 0; |
| 878 | send_rsip(&addr); |
| 879 | return 0; |
| 880 | } |
| 881 | |
| 882 | /* handle message now */ |
| 883 | msg->l2h = msgb_put(msg, rc); |
| 884 | handle_message(msg, &addr); |
| 885 | msgb_reset(msg); |
| 886 | return 0; |
| 887 | } |
| 888 | |
| 889 | /* |
| 890 | * vty code for mgcp below |
| 891 | */ |
| 892 | struct cmd_node mgcp_node = { |
| 893 | MGCP_NODE, |
| 894 | "%s(mgcp)#", |
| 895 | 1, |
| 896 | }; |
| 897 | |
| 898 | static int config_write_mgcp(struct vty *vty) |
| 899 | { |
| 900 | vty_out(vty, "mgcp%s", VTY_NEWLINE); |
| 901 | if (local_ip) |
| 902 | vty_out(vty, " local ip %s%s", local_ip, VTY_NEWLINE); |
| 903 | vty_out(vty, " bts ip %s%s", bts_ip, VTY_NEWLINE); |
| 904 | vty_out(vty, " bind ip %s%s", source_addr, VTY_NEWLINE); |
| 905 | vty_out(vty, " bind port %u%s", source_port, VTY_NEWLINE); |
Holger Hans Peter Freyther | daa7da7 | 2009-11-19 15:08:02 +0100 | [diff] [blame] | 906 | vty_out(vty, " bind early %u%s", !!early_bind, VTY_NEWLINE); |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 907 | vty_out(vty, " rtp base %u%s", rtp_base_port, VTY_NEWLINE); |
Holger Hans Peter Freyther | daa7da7 | 2009-11-19 15:08:02 +0100 | [diff] [blame] | 908 | vty_out(vty, " sdp audio payload number %u%s", audio_payload, VTY_NEWLINE); |
| 909 | vty_out(vty, " sdp audio payload name %s%s", audio_name, VTY_NEWLINE); |
| 910 | vty_out(vty, " loop %u%s", !!audio_loop, VTY_NEWLINE); |
Holger Hans Peter Freyther | d5607c7 | 2009-11-20 11:10:31 +0100 | [diff] [blame] | 911 | vty_out(vty, " endpoints %u%s", number_endpoints, VTY_NEWLINE); |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 912 | |
| 913 | return CMD_SUCCESS; |
| 914 | } |
| 915 | |
Holger Hans Peter Freyther | bca5c68 | 2009-11-19 15:20:48 +0100 | [diff] [blame] | 916 | DEFUN(show_mcgp, show_mgcp_cmd, "show mgcp", |
| 917 | SHOW_STR "Display information about the MGCP Media Gateway") |
| 918 | { |
| 919 | int i; |
| 920 | |
| 921 | vty_out(vty, "MGCP is up and running with %u endpoints:%s", number_endpoints - 1, VTY_NEWLINE); |
| 922 | for (i = 1; i < number_endpoints; ++i) { |
| 923 | struct mgcp_endpoint *endp = &endpoints[i]; |
| 924 | vty_out(vty, " Endpoint 0x%.2x: CI: %d net: %u/%u bts: %u/%u%s", |
| 925 | i, endp->ci, |
| 926 | ntohs(endp->rtp), ntohs(endp->rtcp), |
| 927 | ntohs(endp->bts_rtp), ntohs(endp->bts_rtcp), VTY_NEWLINE); |
| 928 | } |
| 929 | |
| 930 | return CMD_SUCCESS; |
| 931 | } |
| 932 | |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 933 | DEFUN(cfg_mgcp, |
| 934 | cfg_mgcp_cmd, |
| 935 | "mgcp", |
| 936 | "Configure the MGCP") |
| 937 | { |
| 938 | vty->node = MGCP_NODE; |
| 939 | return CMD_SUCCESS; |
| 940 | } |
| 941 | |
| 942 | DEFUN(cfg_mgcp_local_ip, |
| 943 | cfg_mgcp_local_ip_cmd, |
| 944 | "local ip IP", |
| 945 | "Set the IP to be used in SDP records") |
| 946 | { |
| 947 | local_ip = talloc_strdup(tall_bsc_ctx, argv[0]); |
| 948 | return CMD_SUCCESS; |
| 949 | } |
| 950 | |
| 951 | DEFUN(cfg_mgcp_bts_ip, |
| 952 | cfg_mgcp_bts_ip_cmd, |
| 953 | "bts ip IP", |
| 954 | "Set the IP of the BTS for RTP forwarding") |
| 955 | { |
| 956 | bts_ip = talloc_strdup(tall_bsc_ctx, argv[0]); |
| 957 | inet_aton(bts_ip, &bts_in); |
| 958 | return CMD_SUCCESS; |
| 959 | } |
| 960 | |
| 961 | DEFUN(cfg_mgcp_bind_ip, |
| 962 | cfg_mgcp_bind_ip_cmd, |
| 963 | "bind ip IP", |
| 964 | "Bind the MGCP to this local addr") |
| 965 | { |
| 966 | source_addr = talloc_strdup(tall_bsc_ctx, argv[0]); |
| 967 | return CMD_SUCCESS; |
| 968 | } |
| 969 | |
| 970 | DEFUN(cfg_mgcp_bind_port, |
| 971 | cfg_mgcp_bind_port_cmd, |
| 972 | "bind port <0-65534>", |
| 973 | "Bind the MGCP to this port") |
| 974 | { |
| 975 | unsigned int port = atoi(argv[0]); |
| 976 | if (port > 65534) { |
| 977 | vty_out(vty, "%% wrong bind port '%s'%s", argv[0], VTY_NEWLINE); |
| 978 | return CMD_WARNING; |
| 979 | } |
| 980 | |
| 981 | source_port = port; |
| 982 | return CMD_SUCCESS; |
| 983 | } |
| 984 | |
| 985 | DEFUN(cfg_mgcp_bind_early, |
| 986 | cfg_mgcp_bind_early_cmd, |
| 987 | "bind early (0|1)", |
| 988 | "Bind all RTP ports early") |
| 989 | { |
| 990 | unsigned int bind = atoi(argv[0]); |
| 991 | if (bind != 0 && bind != 1) { |
| 992 | vty_out(vty, "%% param must be 0 or 1.%s", VTY_NEWLINE); |
| 993 | return CMD_WARNING; |
| 994 | } |
| 995 | |
| 996 | early_bind = bind == 1; |
| 997 | return CMD_SUCCESS; |
| 998 | } |
| 999 | |
| 1000 | DEFUN(cfg_mgcp_rtp_base_port, |
| 1001 | cfg_mgcp_rtp_base_port_cmd, |
| 1002 | "rtp base <0-65534>", |
| 1003 | "Base port to use") |
| 1004 | { |
| 1005 | unsigned int port = atoi(argv[0]); |
| 1006 | if (port > 65534) { |
| 1007 | vty_out(vty, "%% wrong base port '%s'%s", argv[0], VTY_NEWLINE); |
| 1008 | return CMD_WARNING; |
| 1009 | } |
| 1010 | |
| 1011 | rtp_base_port = port; |
| 1012 | return CMD_SUCCESS; |
| 1013 | } |
| 1014 | |
| 1015 | DEFUN(cfg_mgcp_sdp_payload_number, |
| 1016 | cfg_mgcp_sdp_payload_number_cmd, |
| 1017 | "sdp audio payload number <1-255>", |
| 1018 | "Set the audio codec to use") |
| 1019 | { |
| 1020 | unsigned int payload = atoi(argv[0]); |
| 1021 | if (payload > 255) { |
| 1022 | vty_out(vty, "%% wrong payload number '%s'%s", argv[0], VTY_NEWLINE); |
| 1023 | return CMD_WARNING; |
| 1024 | } |
| 1025 | |
| 1026 | audio_payload = payload; |
| 1027 | return CMD_SUCCESS; |
| 1028 | } |
| 1029 | |
| 1030 | DEFUN(cfg_mgcp_sdp_payload_name, |
| 1031 | cfg_mgcp_sdp_payload_name_cmd, |
| 1032 | "sdp audio payload name NAME", |
| 1033 | "Set the audio name to use") |
| 1034 | { |
| 1035 | audio_name = talloc_strdup(tall_bsc_ctx, argv[0]); |
| 1036 | return CMD_SUCCESS; |
| 1037 | } |
| 1038 | |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 1039 | DEFUN(cfg_mgcp_loop, |
| 1040 | cfg_mgcp_loop_cmd, |
| 1041 | "loop (0|1)", |
| 1042 | "Loop the audio") |
| 1043 | { |
| 1044 | audio_loop = atoi(argv[0]); |
| 1045 | return CMD_SUCCESS; |
| 1046 | } |
| 1047 | |
Holger Hans Peter Freyther | d5607c7 | 2009-11-20 11:10:31 +0100 | [diff] [blame] | 1048 | DEFUN(cfg_mgcp_number_endp, |
| 1049 | cfg_mgcp_number_endp_cmd, |
| 1050 | "number endpoints <0-65534>", |
| 1051 | "The number of endpoints to allocate. This is not dynamic.") |
| 1052 | { |
| 1053 | /* + 1 as we start counting at one */ |
| 1054 | number_endpoints = atoi(argv[0]) + 1; |
| 1055 | return CMD_SUCCESS; |
| 1056 | } |
| 1057 | |
Holger Hans Peter Freyther | 3adc628 | 2009-11-19 15:03:39 +0100 | [diff] [blame] | 1058 | int bsc_vty_init(struct gsm_network *dummy) |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 1059 | { |
| 1060 | cmd_init(1); |
| 1061 | vty_init(); |
| 1062 | |
Holger Hans Peter Freyther | bca5c68 | 2009-11-19 15:20:48 +0100 | [diff] [blame] | 1063 | install_element(VIEW_NODE, &show_mgcp_cmd); |
| 1064 | |
| 1065 | |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 1066 | install_element(CONFIG_NODE, &cfg_mgcp_cmd); |
| 1067 | install_node(&mgcp_node, config_write_mgcp); |
| 1068 | install_default(MGCP_NODE); |
| 1069 | install_element(MGCP_NODE, &cfg_mgcp_local_ip_cmd); |
| 1070 | install_element(MGCP_NODE, &cfg_mgcp_bts_ip_cmd); |
| 1071 | install_element(MGCP_NODE, &cfg_mgcp_bind_ip_cmd); |
| 1072 | install_element(MGCP_NODE, &cfg_mgcp_bind_port_cmd); |
| 1073 | install_element(MGCP_NODE, &cfg_mgcp_bind_early_cmd); |
| 1074 | install_element(MGCP_NODE, &cfg_mgcp_rtp_base_port_cmd); |
| 1075 | install_element(MGCP_NODE, &cfg_mgcp_sdp_payload_number_cmd); |
| 1076 | install_element(MGCP_NODE, &cfg_mgcp_sdp_payload_name_cmd); |
Holger Hans Peter Freyther | e6de05e | 2009-11-18 18:32:31 +0100 | [diff] [blame] | 1077 | install_element(MGCP_NODE, &cfg_mgcp_loop_cmd); |
Holger Hans Peter Freyther | d5607c7 | 2009-11-20 11:10:31 +0100 | [diff] [blame] | 1078 | install_element(MGCP_NODE, &cfg_mgcp_number_endp_cmd); |
Holger Hans Peter Freyther | 3adc628 | 2009-11-19 15:03:39 +0100 | [diff] [blame] | 1079 | return 0; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | int main(int argc, char** argv) |
| 1083 | { |
Holger Hans Peter Freyther | 3adc628 | 2009-11-19 15:03:39 +0100 | [diff] [blame] | 1084 | struct gsm_network dummy_network; |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 1085 | struct sockaddr_in addr; |
| 1086 | int on = 1, i, rc; |
| 1087 | |
| 1088 | tall_bsc_ctx = talloc_named_const(NULL, 1, "mgcp-callagent"); |
| 1089 | handle_options(argc, argv); |
| 1090 | |
Holger Hans Peter Freyther | 3adc628 | 2009-11-19 15:03:39 +0100 | [diff] [blame] | 1091 | telnet_init(&dummy_network, 4243); |
Holger Hans Peter Freyther | 9a26b7c | 2009-10-09 07:08:11 +0200 | [diff] [blame] | 1092 | rc = vty_read_config_file(config_file); |
| 1093 | if (rc < 0) { |
| 1094 | fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file); |
| 1095 | return rc; |
| 1096 | } |
| 1097 | |
| 1098 | |
| 1099 | if (!bts_ip) { |
| 1100 | fprintf(stderr, "Need to specify the BTS ip address for RTP handling.\n"); |
| 1101 | return -1; |
| 1102 | } |
| 1103 | |
| 1104 | endpoints = _talloc_zero_array(tall_bsc_ctx, |
| 1105 | sizeof(struct mgcp_endpoint), |
| 1106 | number_endpoints, "endpoints"); |
| 1107 | if (!endpoints) { |
| 1108 | fprintf(stderr, "Failed to allocate endpoints: %d. Quitting.\n", number_endpoints); |
| 1109 | return -1; |
| 1110 | } |
| 1111 | |
| 1112 | /* Initialize all endpoints */ |
| 1113 | for (i = 0; i < number_endpoints; ++i) { |
| 1114 | endpoints[i].local_rtp.fd = -1; |
| 1115 | endpoints[i].local_rtcp.fd = -1; |
| 1116 | endpoints[i].ci = CI_UNUSED; |
| 1117 | } |
| 1118 | |
| 1119 | /* initialize the socket */ |
| 1120 | bfd.when = BSC_FD_READ; |
| 1121 | bfd.cb = read_call_agent; |
| 1122 | bfd.fd = socket(AF_INET, SOCK_DGRAM, 0); |
| 1123 | if (bfd.fd < 0) { |
| 1124 | perror("Gateway failed to listen"); |
| 1125 | return -1; |
| 1126 | } |
| 1127 | |
| 1128 | setsockopt(bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 1129 | |
| 1130 | memset(&addr, 0, sizeof(addr)); |
| 1131 | addr.sin_family = AF_INET; |
| 1132 | addr.sin_port = htons(source_port); |
| 1133 | inet_aton(source_addr, &addr.sin_addr); |
| 1134 | |
| 1135 | if (bind(bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { |
| 1136 | perror("Gateway failed to bind"); |
| 1137 | return -1; |
| 1138 | } |
| 1139 | |
| 1140 | bfd.data = msgb_alloc(4096, "mgcp-msg"); |
| 1141 | if (!bfd.data) { |
| 1142 | fprintf(stderr, "Gateway memory error.\n"); |
| 1143 | return -1; |
| 1144 | } |
| 1145 | |
| 1146 | |
| 1147 | if (bsc_register_fd(&bfd) != 0) { |
| 1148 | DEBUGP(DMGCP, "Failed to register the fd\n"); |
| 1149 | return -1; |
| 1150 | } |
| 1151 | |
| 1152 | /* initialisation */ |
| 1153 | srand(time(NULL)); |
| 1154 | |
| 1155 | /* early bind */ |
| 1156 | if (early_bind) { |
| 1157 | for (i = 1; i < number_endpoints; ++i) { |
| 1158 | struct mgcp_endpoint *endp = &endpoints[i]; |
| 1159 | endp->rtp_port = rtp_calculate_port(ENDPOINT_NUMBER(endp), rtp_base_port); |
| 1160 | if (bind_rtp(endp) != 0) |
| 1161 | return -1; |
| 1162 | } |
| 1163 | } |
| 1164 | |
| 1165 | /* main loop */ |
| 1166 | while (1) { |
| 1167 | bsc_select_main(0); |
| 1168 | } |
| 1169 | |
| 1170 | |
| 1171 | return 0; |
| 1172 | } |