Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 1 | /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| 2 | /* The protocol implementation */ |
| 3 | |
| 4 | /* |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 5 | * (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| 6 | * (C) 2009-2010 by On-Waves |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <ctype.h> |
| 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | #include <time.h> |
| 30 | #include <limits.h> |
| 31 | #include <unistd.h> |
| 32 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 33 | #include <openbsc/debug.h> |
Harald Welte | dfe6c7d | 2010-02-20 16:24:02 +0100 | [diff] [blame] | 34 | #include <osmocore/msgb.h> |
| 35 | #include <osmocore/talloc.h> |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 36 | #include <openbsc/gsm_data.h> |
Harald Welte | dfe6c7d | 2010-02-20 16:24:02 +0100 | [diff] [blame] | 37 | #include <osmocore/select.h> |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 38 | #include <openbsc/mgcp.h> |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 39 | #include <openbsc/mgcp_internal.h> |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 40 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 41 | enum mgcp_connection_mode { |
| 42 | MGCP_CONN_NONE = 0, |
| 43 | MGCP_CONN_RECV_ONLY = 1, |
| 44 | MGCP_CONN_SEND_ONLY = 2, |
| 45 | MGCP_CONN_RECV_SEND = MGCP_CONN_RECV_ONLY | MGCP_CONN_SEND_ONLY, |
| 46 | }; |
| 47 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 48 | /** |
| 49 | * Macro for tokenizing MGCP messages and SDP in one go. |
| 50 | * |
| 51 | */ |
| 52 | #define MSG_TOKENIZE_START \ |
| 53 | line_start = 0; \ |
| 54 | for (i = 0; i < msgb_l3len(msg); ++i) { \ |
| 55 | /* we have a line end */ \ |
| 56 | if (msg->l3h[i] == '\n') { \ |
| 57 | /* skip the first line */ \ |
| 58 | if (line_start == 0) { \ |
| 59 | line_start = i + 1; \ |
| 60 | continue; \ |
| 61 | } \ |
| 62 | \ |
| 63 | /* check if we have a proper param */ \ |
| 64 | if (i - line_start == 1 && msg->l3h[line_start] == '\r') { \ |
| 65 | } else if (i - line_start > 2 \ |
| 66 | && islower(msg->l3h[line_start]) \ |
| 67 | && msg->l3h[line_start + 1] == '=') { \ |
| 68 | } else if (i - line_start < 3 \ |
| 69 | || msg->l3h[line_start + 1] != ':' \ |
| 70 | || msg->l3h[line_start + 2] != ' ') \ |
| 71 | goto error; \ |
| 72 | \ |
| 73 | msg->l3h[i] = '\0'; \ |
| 74 | if (msg->l3h[i-1] == '\r') \ |
| 75 | msg->l3h[i-1] = '\0'; |
| 76 | |
| 77 | #define MSG_TOKENIZE_END \ |
| 78 | line_start = i + 1; \ |
| 79 | } \ |
| 80 | } |
| 81 | |
| 82 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 83 | struct mgcp_request { |
| 84 | char *name; |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 85 | struct msgb *(*handle_request) (struct mgcp_config *cfg, struct msgb *msg); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 86 | char *debug_name; |
| 87 | }; |
| 88 | |
| 89 | #define MGCP_REQUEST(NAME, REQ, DEBUG_NAME) \ |
| 90 | { .name = NAME, .handle_request = REQ, .debug_name = DEBUG_NAME }, |
| 91 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 92 | static struct msgb *handle_audit_endpoint(struct mgcp_config *cfg, struct msgb *msg); |
| 93 | static struct msgb *handle_create_con(struct mgcp_config *cfg, struct msgb *msg); |
| 94 | static struct msgb *handle_delete_con(struct mgcp_config *cfg, struct msgb *msg); |
| 95 | static struct msgb *handle_modify_con(struct mgcp_config *cfg, struct msgb *msg); |
Holger Hans Peter Freyther | 9bdcc9c | 2010-03-31 06:39:35 +0200 | [diff] [blame] | 96 | static struct msgb *handle_rsip(struct mgcp_config *cfg, struct msgb *msg); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 97 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 98 | static int generate_call_id(struct mgcp_config *cfg) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 99 | { |
| 100 | int i; |
| 101 | |
| 102 | /* use the call id */ |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 103 | ++cfg->last_call_id; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 104 | |
| 105 | /* handle wrap around */ |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 106 | if (cfg->last_call_id == CI_UNUSED) |
| 107 | ++cfg->last_call_id; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 108 | |
| 109 | /* callstack can only be of size number_of_endpoints */ |
| 110 | /* verify that the call id is free, e.g. in case of overrun */ |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 111 | for (i = 1; i < cfg->number_endpoints; ++i) |
| 112 | if (cfg->endpoints[i].ci == cfg->last_call_id) |
| 113 | return generate_call_id(cfg); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 114 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 115 | return cfg->last_call_id; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 116 | } |
| 117 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 118 | /* |
| 119 | * array of function pointers for handling various |
| 120 | * messages. In the future this might be binary sorted |
| 121 | * for performance reasons. |
| 122 | */ |
| 123 | static const struct mgcp_request mgcp_requests [] = { |
| 124 | MGCP_REQUEST("AUEP", handle_audit_endpoint, "AuditEndpoint") |
| 125 | MGCP_REQUEST("CRCX", handle_create_con, "CreateConnection") |
| 126 | MGCP_REQUEST("DLCX", handle_delete_con, "DeleteConnection") |
| 127 | MGCP_REQUEST("MDCX", handle_modify_con, "ModifiyConnection") |
Holger Hans Peter Freyther | 9bdcc9c | 2010-03-31 06:39:35 +0200 | [diff] [blame] | 128 | |
| 129 | /* SPEC extension */ |
| 130 | MGCP_REQUEST("RSIP", handle_rsip, "ReSetInProgress") |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 131 | }; |
| 132 | |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 133 | static struct msgb *mgcp_msgb_alloc(void) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 134 | { |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 135 | struct msgb *msg; |
| 136 | msg = msgb_alloc_headroom(4096, 128, "MGCP msg"); |
| 137 | if (!msg) |
| 138 | LOGP(DMGCP, LOGL_ERROR, "Failed to msgb for MGCP data.\n"); |
| 139 | |
| 140 | return msg; |
| 141 | } |
| 142 | |
Holger Hans Peter Freyther | 6414a0c | 2010-02-21 10:50:46 +0100 | [diff] [blame] | 143 | struct msgb *mgcp_create_response_with_data(int code, const char *msg, const char *trans, |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 144 | const char *data) |
| 145 | { |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 146 | int len; |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 147 | struct msgb *res; |
| 148 | |
| 149 | res = mgcp_msgb_alloc(); |
| 150 | if (!res) |
| 151 | return NULL; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 152 | |
| 153 | if (data) { |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 154 | len = snprintf((char *) res->data, 2048, "%d %s\n%s", code, trans, data); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 155 | } else { |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 156 | len = snprintf((char *) res->data, 2048, "%d %s\n", code, trans); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 157 | } |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 158 | |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 159 | res->l2h = msgb_put(res, len); |
Holger Hans Peter Freyther | 63f2db2 | 2010-02-26 13:30:57 +0100 | [diff] [blame] | 160 | LOGP(DMGCP, LOGL_DEBUG, "Sending response: code: %d for '%s'\n", code, res->l2h); |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 161 | return res; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 162 | } |
| 163 | |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 164 | static struct msgb *create_response(int code, const char *msg, const char *trans) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 165 | { |
Holger Hans Peter Freyther | 6414a0c | 2010-02-21 10:50:46 +0100 | [diff] [blame] | 166 | return mgcp_create_response_with_data(code, msg, trans, NULL); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 167 | } |
| 168 | |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 169 | static struct msgb *create_response_with_sdp(struct mgcp_endpoint *endp, |
| 170 | const char *msg, const char *trans_id) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 171 | { |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 172 | const char *addr = endp->cfg->local_ip; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 173 | char sdp_record[4096]; |
| 174 | |
| 175 | if (!addr) |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 176 | addr = endp->cfg->source_addr; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 177 | |
| 178 | snprintf(sdp_record, sizeof(sdp_record) - 1, |
| 179 | "I: %d\n\n" |
| 180 | "v=0\r\n" |
| 181 | "c=IN IP4 %s\r\n" |
| 182 | "m=audio %d RTP/AVP %d\r\n" |
| 183 | "a=rtpmap:%d %s\r\n", |
| 184 | endp->ci, addr, endp->rtp_port, |
Holger Hans Peter Freyther | ef6bb25 | 2010-02-26 13:41:22 +0100 | [diff] [blame] | 185 | endp->bts_payload_type, endp->bts_payload_type, |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 186 | endp->cfg->audio_name); |
Holger Hans Peter Freyther | 6414a0c | 2010-02-21 10:50:46 +0100 | [diff] [blame] | 187 | return mgcp_create_response_with_data(200, msg, trans_id, sdp_record); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 188 | } |
| 189 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 190 | /* |
| 191 | * handle incoming messages: |
| 192 | * - this can be a command (four letters, space, transaction id) |
| 193 | * - or a response (three numbers, space, transaction id) |
| 194 | */ |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 195 | struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 196 | { |
| 197 | int code; |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 198 | struct msgb *resp = NULL; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 199 | |
Holger Hans Peter Freyther | f36a11a | 2010-03-31 13:26:46 +0200 | [diff] [blame] | 200 | if (msgb_l2len(msg) < 4) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 201 | LOGP(DMGCP, LOGL_ERROR, "mgs too short: %d\n", msg->len); |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 202 | return NULL; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | /* attempt to treat it as a response */ |
Holger Hans Peter Freyther | f36a11a | 2010-03-31 13:26:46 +0200 | [diff] [blame] | 206 | if (sscanf((const char *)&msg->l2h[0], "%3d %*s", &code) == 1) { |
Holger Hans Peter Freyther | 63f2db2 | 2010-02-26 13:30:57 +0100 | [diff] [blame] | 207 | LOGP(DMGCP, LOGL_DEBUG, "Response: Code: %d\n", code); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 208 | } else { |
| 209 | int i, handled = 0; |
| 210 | msg->l3h = &msg->l2h[4]; |
| 211 | for (i = 0; i < ARRAY_SIZE(mgcp_requests); ++i) |
Holger Hans Peter Freyther | f36a11a | 2010-03-31 13:26:46 +0200 | [diff] [blame] | 212 | if (strncmp(mgcp_requests[i].name, (const char *) &msg->l2h[0], 4) == 0) { |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 213 | handled = 1; |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 214 | resp = mgcp_requests[i].handle_request(cfg, msg); |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 215 | break; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 216 | } |
| 217 | if (!handled) { |
Holger Hans Peter Freyther | f36a11a | 2010-03-31 13:26:46 +0200 | [diff] [blame] | 218 | LOGP(DMGCP, LOGL_NOTICE, "MSG with type: '%.4s' not handled\n", &msg->l2h[0]); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 219 | } |
| 220 | } |
| 221 | |
Holger Hans Peter Freyther | 62e836c | 2010-02-03 11:03:45 +0100 | [diff] [blame] | 222 | return resp; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | /* string tokenizer for the poor */ |
| 226 | static int find_msg_pointers(struct msgb *msg, struct mgcp_msg_ptr *ptrs, int ptrs_length) |
| 227 | { |
| 228 | int i, found = 0; |
| 229 | |
| 230 | int whitespace = 1; |
| 231 | for (i = 0; i < msgb_l3len(msg) && ptrs_length > 0; ++i) { |
| 232 | /* if we have a space we found an end */ |
| 233 | if (msg->l3h[i] == ' ' || msg->l3h[i] == '\r' || msg->l3h[i] == '\n') { |
| 234 | if (!whitespace) { |
| 235 | ++found; |
| 236 | whitespace = 1; |
| 237 | ptrs->length = i - ptrs->start - 1; |
| 238 | ++ptrs; |
| 239 | --ptrs_length; |
| 240 | } else { |
| 241 | /* skip any number of whitespace */ |
| 242 | } |
| 243 | |
| 244 | /* line end... stop */ |
| 245 | if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n') |
| 246 | break; |
| 247 | } else if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n') { |
| 248 | /* line end, be done */ |
| 249 | break; |
| 250 | } else if (whitespace) { |
| 251 | whitespace = 0; |
| 252 | ptrs->start = i; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | if (ptrs_length == 0) |
| 257 | return -1; |
| 258 | return found; |
| 259 | } |
| 260 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 261 | static struct mgcp_endpoint *find_endpoint(struct mgcp_config *cfg, const char *mgcp) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 262 | { |
| 263 | char *endptr = NULL; |
| 264 | unsigned int gw = INT_MAX; |
| 265 | |
| 266 | gw = strtoul(mgcp, &endptr, 16); |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 267 | if (gw == 0 || gw >= cfg->number_endpoints || strcmp(endptr, "@mgw") != 0) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 268 | LOGP(DMGCP, LOGL_ERROR, "Not able to find endpoint: '%s'\n", mgcp); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 269 | return NULL; |
| 270 | } |
| 271 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 272 | return &cfg->endpoints[gw]; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 273 | } |
| 274 | |
Holger Hans Peter Freyther | f2f1591 | 2010-04-01 03:27:04 +0200 | [diff] [blame] | 275 | int mgcp_analyze_header(struct mgcp_config *cfg, struct msgb *msg, |
| 276 | struct mgcp_msg_ptr *ptr, int size, |
| 277 | const char **transaction_id, struct mgcp_endpoint **endp) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 278 | { |
| 279 | int found; |
| 280 | |
Holger Hans Peter Freyther | a820c5f | 2010-02-26 13:32:55 +0100 | [diff] [blame] | 281 | *transaction_id = "000000"; |
| 282 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 283 | if (size < 3) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 284 | LOGP(DMGCP, LOGL_ERROR, "Not enough space in ptr\n"); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 285 | return -1; |
| 286 | } |
| 287 | |
| 288 | found = find_msg_pointers(msg, ptr, size); |
| 289 | |
Holger Hans Peter Freyther | a820c5f | 2010-02-26 13:32:55 +0100 | [diff] [blame] | 290 | if (found <= 3) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 291 | LOGP(DMGCP, LOGL_ERROR, "Gateway: Not enough params. Found: %d\n", found); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 292 | return -1; |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * replace the space with \0. the main method gurantess that |
| 297 | * we still have + 1 for null termination |
| 298 | */ |
| 299 | msg->l3h[ptr[3].start + ptr[3].length + 1] = '\0'; |
| 300 | msg->l3h[ptr[2].start + ptr[2].length + 1] = '\0'; |
| 301 | msg->l3h[ptr[1].start + ptr[1].length + 1] = '\0'; |
| 302 | msg->l3h[ptr[0].start + ptr[0].length + 1] = '\0'; |
| 303 | |
| 304 | if (strncmp("1.0", (const char *)&msg->l3h[ptr[3].start], 3) != 0 |
| 305 | || strncmp("MGCP", (const char *)&msg->l3h[ptr[2].start], 4) != 0) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 306 | LOGP(DMGCP, LOGL_ERROR, "Wrong MGCP version. Not handling: '%s' '%s'\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 307 | (const char *)&msg->l3h[ptr[3].start], |
| 308 | (const char *)&msg->l3h[ptr[2].start]); |
| 309 | return -1; |
| 310 | } |
| 311 | |
| 312 | *transaction_id = (const char *)&msg->l3h[ptr[0].start]; |
Holger Hans Peter Freyther | f2f1591 | 2010-04-01 03:27:04 +0200 | [diff] [blame] | 313 | if (endp) { |
| 314 | *endp = find_endpoint(cfg, (const char *)&msg->l3h[ptr[1].start]); |
| 315 | return *endp == NULL; |
| 316 | } |
| 317 | return 0; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | static int verify_call_id(const struct mgcp_endpoint *endp, |
| 321 | const char *callid) |
| 322 | { |
| 323 | if (strcmp(endp->callid, callid) != 0) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 324 | LOGP(DMGCP, LOGL_ERROR, "CallIDs does not match on 0x%x. '%s' != '%s'\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 325 | ENDPOINT_NUMBER(endp), endp->callid, callid); |
| 326 | return -1; |
| 327 | } |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static int verify_ci(const struct mgcp_endpoint *endp, |
| 333 | const char *ci) |
| 334 | { |
| 335 | if (atoi(ci) != endp->ci) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 336 | LOGP(DMGCP, LOGL_ERROR, "ConnectionIdentifiers do not match on 0x%x. %d != %s\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 337 | ENDPOINT_NUMBER(endp), endp->ci, ci); |
| 338 | return -1; |
| 339 | } |
| 340 | |
| 341 | return 0; |
| 342 | } |
| 343 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 344 | static struct msgb *handle_audit_endpoint(struct mgcp_config *cfg, struct msgb *msg) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 345 | { |
| 346 | struct mgcp_msg_ptr data_ptrs[6]; |
| 347 | int found, response; |
| 348 | const char *trans_id; |
| 349 | struct mgcp_endpoint *endp; |
| 350 | |
Holger Hans Peter Freyther | f2f1591 | 2010-04-01 03:27:04 +0200 | [diff] [blame] | 351 | found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 352 | if (found != 0) |
| 353 | response = 500; |
| 354 | else |
| 355 | response = 200; |
| 356 | |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 357 | return create_response(response, "AUEP", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | static int parse_conn_mode(const char* msg, int *conn_mode) |
| 361 | { |
| 362 | int ret = 0; |
| 363 | if (strcmp(msg, "recvonly") == 0) |
| 364 | *conn_mode = MGCP_CONN_RECV_ONLY; |
| 365 | else if (strcmp(msg, "sendrecv") == 0) |
| 366 | *conn_mode = MGCP_CONN_RECV_SEND; |
| 367 | else { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 368 | LOGP(DMGCP, LOGL_ERROR, "Unknown connection mode: '%s'\n", msg); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 369 | ret = -1; |
| 370 | } |
| 371 | |
| 372 | return ret; |
| 373 | } |
| 374 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 375 | static struct msgb *handle_create_con(struct mgcp_config *cfg, struct msgb *msg) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 376 | { |
| 377 | struct mgcp_msg_ptr data_ptrs[6]; |
| 378 | int found, i, line_start; |
| 379 | const char *trans_id; |
| 380 | struct mgcp_endpoint *endp; |
| 381 | int error_code = 500; |
Holger Hans Peter Freyther | 1b0ea97 | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 382 | int port; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 383 | |
Holger Hans Peter Freyther | f2f1591 | 2010-04-01 03:27:04 +0200 | [diff] [blame] | 384 | found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 385 | if (found != 0) |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 386 | return create_response(500, "CRCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 387 | |
| 388 | if (endp->ci != CI_UNUSED) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 389 | LOGP(DMGCP, LOGL_ERROR, "Endpoint is already used. 0x%x\n", ENDPOINT_NUMBER(endp)); |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 390 | return create_response(500, "CRCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | /* parse CallID C: and LocalParameters L: */ |
| 394 | MSG_TOKENIZE_START |
| 395 | switch (msg->l3h[line_start]) { |
| 396 | case 'L': |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 397 | endp->local_options = talloc_strdup(cfg->endpoints, |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 398 | (const char *)&msg->l3h[line_start + 3]); |
| 399 | break; |
| 400 | case 'C': |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 401 | endp->callid = talloc_strdup(cfg->endpoints, |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 402 | (const char *)&msg->l3h[line_start + 3]); |
| 403 | break; |
| 404 | case 'M': |
| 405 | if (parse_conn_mode((const char *)&msg->l3h[line_start + 3], |
| 406 | &endp->conn_mode) != 0) { |
| 407 | error_code = 517; |
| 408 | goto error2; |
| 409 | } |
| 410 | break; |
| 411 | default: |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 412 | LOGP(DMGCP, LOGL_NOTICE, "Unhandled option: '%c'/%d on 0x%x\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 413 | msg->l3h[line_start], msg->l3h[line_start], |
| 414 | ENDPOINT_NUMBER(endp)); |
| 415 | break; |
| 416 | } |
| 417 | MSG_TOKENIZE_END |
| 418 | |
| 419 | /* initialize */ |
| 420 | endp->net_rtp = endp->net_rtcp = endp->bts_rtp = endp->bts_rtcp = 0; |
| 421 | |
| 422 | /* set to zero until we get the info */ |
| 423 | memset(&endp->remote, 0, sizeof(endp->remote)); |
| 424 | |
| 425 | /* bind to the port now */ |
Holger Hans Peter Freyther | 1b0ea97 | 2010-02-21 11:11:04 +0100 | [diff] [blame] | 426 | port = rtp_calculate_port(ENDPOINT_NUMBER(endp), cfg->rtp_base_port); |
| 427 | if (cfg->early_bind) |
| 428 | endp->rtp_port = port; |
| 429 | else if (mgcp_bind_rtp_port(endp, port) != 0) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 430 | goto error2; |
| 431 | |
| 432 | /* assign a local call identifier or fail */ |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 433 | endp->ci = generate_call_id(cfg); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 434 | if (endp->ci == CI_UNUSED) |
| 435 | goto error2; |
| 436 | |
Holger Hans Peter Freyther | ef6bb25 | 2010-02-26 13:41:22 +0100 | [diff] [blame] | 437 | endp->bts_payload_type = cfg->audio_payload; |
| 438 | |
Holger Hans Peter Freyther | fe86d3c | 2010-02-26 13:37:05 +0100 | [diff] [blame] | 439 | /* policy CB */ |
| 440 | if (cfg->policy_cb) { |
| 441 | switch (cfg->policy_cb(cfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_CRCX, trans_id)) { |
| 442 | case MGCP_POLICY_REJECT: |
| 443 | LOGP(DMGCP, LOGL_NOTICE, "CRCX rejected by policy on 0x%x\n", |
| 444 | ENDPOINT_NUMBER(endp)); |
| 445 | mgcp_free_endp(endp); |
| 446 | return create_response(500, "CRCX", trans_id); |
| 447 | break; |
| 448 | case MGCP_POLICY_DEFER: |
| 449 | /* stop processing */ |
| 450 | return NULL; |
| 451 | break; |
| 452 | case MGCP_POLICY_CONT: |
| 453 | /* just continue */ |
| 454 | break; |
| 455 | } |
| 456 | } |
| 457 | |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 458 | LOGP(DMGCP, LOGL_NOTICE, "Creating endpoint on: 0x%x CI: %u port: %u\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 459 | ENDPOINT_NUMBER(endp), endp->ci, endp->rtp_port); |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 460 | if (cfg->change_cb) |
| 461 | cfg->change_cb(cfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_CRCX, endp->rtp_port); |
Holger Hans Peter Freyther | 77f7afe | 2010-02-03 09:54:43 +0100 | [diff] [blame] | 462 | |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 463 | return create_response_with_sdp(endp, "CRCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 464 | error: |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 465 | LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 466 | hexdump(msg->l3h, msgb_l3len(msg)), |
| 467 | ENDPOINT_NUMBER(endp), line_start, i); |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 468 | return create_response(error_code, "CRCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 469 | |
| 470 | error2: |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 471 | LOGP(DMGCP, LOGL_NOTICE, "Resource error on 0x%x\n", ENDPOINT_NUMBER(endp)); |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 472 | return create_response(error_code, "CRCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 473 | } |
| 474 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 475 | static struct msgb *handle_modify_con(struct mgcp_config *cfg, struct msgb *msg) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 476 | { |
| 477 | struct mgcp_msg_ptr data_ptrs[6]; |
| 478 | int found, i, line_start; |
| 479 | const char *trans_id; |
| 480 | struct mgcp_endpoint *endp; |
| 481 | int error_code = 500; |
| 482 | |
Holger Hans Peter Freyther | f2f1591 | 2010-04-01 03:27:04 +0200 | [diff] [blame] | 483 | found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 484 | if (found != 0) |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 485 | return create_response(error_code, "MDCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 486 | |
| 487 | if (endp->ci == CI_UNUSED) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 488 | LOGP(DMGCP, LOGL_ERROR, "Endpoint is not holding a connection. 0x%x\n", ENDPOINT_NUMBER(endp)); |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 489 | return create_response(error_code, "MDCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | MSG_TOKENIZE_START |
| 493 | switch (msg->l3h[line_start]) { |
| 494 | case 'C': { |
| 495 | if (verify_call_id(endp, (const char *)&msg->l3h[line_start + 3]) != 0) |
| 496 | goto error3; |
| 497 | break; |
| 498 | } |
| 499 | case 'I': { |
| 500 | if (verify_ci(endp, (const char *)&msg->l3h[line_start + 3]) != 0) |
| 501 | goto error3; |
| 502 | break; |
| 503 | } |
| 504 | case 'L': |
| 505 | /* skip */ |
| 506 | break; |
| 507 | case 'M': |
| 508 | if (parse_conn_mode((const char *)&msg->l3h[line_start + 3], |
| 509 | &endp->conn_mode) != 0) { |
| 510 | error_code = 517; |
| 511 | goto error3; |
| 512 | } |
| 513 | break; |
| 514 | case '\0': |
| 515 | /* SDP file begins */ |
| 516 | break; |
| 517 | case 'a': |
| 518 | case 'o': |
| 519 | case 's': |
| 520 | case 't': |
| 521 | case 'v': |
| 522 | /* skip these SDP attributes */ |
| 523 | break; |
| 524 | case 'm': { |
| 525 | int port; |
Holger Hans Peter Freyther | ef6bb25 | 2010-02-26 13:41:22 +0100 | [diff] [blame] | 526 | int payload; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 527 | const char *param = (const char *)&msg->l3h[line_start]; |
| 528 | |
Holger Hans Peter Freyther | ef6bb25 | 2010-02-26 13:41:22 +0100 | [diff] [blame] | 529 | if (sscanf(param, "m=audio %d RTP/AVP %d", &port, &payload) == 2) { |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 530 | endp->net_rtp = htons(port); |
| 531 | endp->net_rtcp = htons(port + 1); |
Holger Hans Peter Freyther | ef6bb25 | 2010-02-26 13:41:22 +0100 | [diff] [blame] | 532 | endp->net_payload_type = payload; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 533 | } |
| 534 | break; |
| 535 | } |
| 536 | case 'c': { |
| 537 | char ipv4[16]; |
| 538 | const char *param = (const char *)&msg->l3h[line_start]; |
| 539 | |
| 540 | if (sscanf(param, "c=IN IP4 %15s", ipv4) == 1) { |
| 541 | inet_aton(ipv4, &endp->remote); |
| 542 | } |
| 543 | break; |
| 544 | } |
| 545 | default: |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 546 | LOGP(DMGCP, LOGL_NOTICE, "Unhandled option: '%c'/%d on 0x%x\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 547 | msg->l3h[line_start], msg->l3h[line_start], |
| 548 | ENDPOINT_NUMBER(endp)); |
| 549 | break; |
| 550 | } |
| 551 | MSG_TOKENIZE_END |
| 552 | |
Holger Hans Peter Freyther | fe86d3c | 2010-02-26 13:37:05 +0100 | [diff] [blame] | 553 | /* policy CB */ |
| 554 | if (cfg->policy_cb) { |
| 555 | switch (cfg->policy_cb(cfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_MDCX, trans_id)) { |
| 556 | case MGCP_POLICY_REJECT: |
| 557 | LOGP(DMGCP, LOGL_NOTICE, "MDCX rejected by policy on 0x%x\n", |
| 558 | ENDPOINT_NUMBER(endp)); |
| 559 | return create_response(500, "MDCX", trans_id); |
| 560 | break; |
| 561 | case MGCP_POLICY_DEFER: |
| 562 | /* stop processing */ |
| 563 | return NULL; |
| 564 | break; |
| 565 | case MGCP_POLICY_CONT: |
| 566 | /* just continue */ |
| 567 | break; |
| 568 | } |
| 569 | } |
| 570 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 571 | /* modify */ |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 572 | LOGP(DMGCP, LOGL_NOTICE, "Modified endpoint on: 0x%x Server: %s:%u\n", |
Holger Hans Peter Freyther | 63f2db2 | 2010-02-26 13:30:57 +0100 | [diff] [blame] | 573 | ENDPOINT_NUMBER(endp), inet_ntoa(endp->remote), ntohs(endp->net_rtp)); |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 574 | if (cfg->change_cb) |
| 575 | cfg->change_cb(cfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_MDCX, endp->rtp_port); |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 576 | return create_response_with_sdp(endp, "MDCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 577 | |
| 578 | error: |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 579 | LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d %d\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 580 | hexdump(msg->l3h, msgb_l3len(msg)), |
| 581 | ENDPOINT_NUMBER(endp), line_start, i, msg->l3h[line_start]); |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 582 | return create_response(error_code, "MDCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 583 | |
| 584 | error3: |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 585 | return create_response(error_code, "MDCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 586 | } |
| 587 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 588 | static struct msgb *handle_delete_con(struct mgcp_config *cfg, struct msgb *msg) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 589 | { |
| 590 | struct mgcp_msg_ptr data_ptrs[6]; |
| 591 | int found, i, line_start; |
| 592 | const char *trans_id; |
| 593 | struct mgcp_endpoint *endp; |
| 594 | int error_code = 500; |
| 595 | |
Holger Hans Peter Freyther | f2f1591 | 2010-04-01 03:27:04 +0200 | [diff] [blame] | 596 | found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 597 | if (found != 0) |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 598 | return create_response(error_code, "DLCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 599 | |
| 600 | if (endp->ci == CI_UNUSED) { |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 601 | LOGP(DMGCP, LOGL_ERROR, "Endpoint is not used. 0x%x\n", ENDPOINT_NUMBER(endp)); |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 602 | return create_response(error_code, "DLCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 603 | } |
| 604 | |
| 605 | MSG_TOKENIZE_START |
| 606 | switch (msg->l3h[line_start]) { |
| 607 | case 'C': { |
| 608 | if (verify_call_id(endp, (const char *)&msg->l3h[line_start + 3]) != 0) |
| 609 | goto error3; |
| 610 | break; |
| 611 | } |
| 612 | case 'I': { |
| 613 | if (verify_ci(endp, (const char *)&msg->l3h[line_start + 3]) != 0) |
| 614 | goto error3; |
| 615 | break; |
| 616 | } |
| 617 | default: |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 618 | LOGP(DMGCP, LOGL_NOTICE, "Unhandled option: '%c'/%d on 0x%x\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 619 | msg->l3h[line_start], msg->l3h[line_start], |
| 620 | ENDPOINT_NUMBER(endp)); |
| 621 | break; |
| 622 | } |
| 623 | MSG_TOKENIZE_END |
| 624 | |
Holger Hans Peter Freyther | fe86d3c | 2010-02-26 13:37:05 +0100 | [diff] [blame] | 625 | /* policy CB */ |
| 626 | if (cfg->policy_cb) { |
| 627 | switch (cfg->policy_cb(cfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_DLCX, trans_id)) { |
| 628 | case MGCP_POLICY_REJECT: |
| 629 | LOGP(DMGCP, LOGL_NOTICE, "DLCX rejected by policy on 0x%x\n", |
| 630 | ENDPOINT_NUMBER(endp)); |
| 631 | return create_response(500, "DLCX", trans_id); |
| 632 | break; |
| 633 | case MGCP_POLICY_DEFER: |
| 634 | /* stop processing */ |
| 635 | return NULL; |
| 636 | break; |
| 637 | case MGCP_POLICY_CONT: |
| 638 | /* just continue */ |
| 639 | break; |
| 640 | } |
| 641 | } |
| 642 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 643 | /* free the connection */ |
Holger Hans Peter Freyther | 154b955 | 2010-02-26 13:27:51 +0100 | [diff] [blame] | 644 | mgcp_free_endp(endp); |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 645 | if (cfg->change_cb) |
| 646 | cfg->change_cb(cfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_DLCX, endp->rtp_port); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 647 | |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 648 | return create_response(250, "DLCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 649 | |
| 650 | error: |
Holger Hans Peter Freyther | 2ada71d | 2010-02-03 09:13:10 +0100 | [diff] [blame] | 651 | LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d\n", |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 652 | hexdump(msg->l3h, msgb_l3len(msg)), |
| 653 | ENDPOINT_NUMBER(endp), line_start, i); |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 654 | return create_response(error_code, "DLCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 655 | |
| 656 | error3: |
Holger Hans Peter Freyther | 8d188ed | 2010-02-21 01:44:08 +0100 | [diff] [blame] | 657 | return create_response(error_code, "DLCX", trans_id); |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 658 | } |
| 659 | |
Holger Hans Peter Freyther | 9bdcc9c | 2010-03-31 06:39:35 +0200 | [diff] [blame] | 660 | static struct msgb *handle_rsip(struct mgcp_config *cfg, struct msgb *msg) |
| 661 | { |
| 662 | if (cfg->reset_cb) |
| 663 | cfg->reset_cb(cfg); |
| 664 | return NULL; |
| 665 | } |
| 666 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 667 | struct mgcp_config *mgcp_config_alloc(void) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 668 | { |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 669 | struct mgcp_config *cfg; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 670 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 671 | cfg = talloc_zero(NULL, struct mgcp_config); |
| 672 | if (!cfg) { |
| 673 | LOGP(DMGCP, LOGL_FATAL, "Failed to allocate config.\n"); |
| 674 | return NULL; |
| 675 | } |
| 676 | |
| 677 | cfg->source_port = 2427; |
| 678 | cfg->source_addr = talloc_strdup(cfg, "0.0.0.0"); |
| 679 | cfg->audio_name = talloc_strdup(cfg, "GSM-EFR/8000"); |
| 680 | cfg->audio_payload = 97; |
| 681 | cfg->rtp_base_port = RTP_PORT_DEFAULT; |
| 682 | |
| 683 | return cfg; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 684 | } |
| 685 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 686 | int mgcp_endpoints_allocate(struct mgcp_config *cfg) |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 687 | { |
| 688 | int i; |
| 689 | |
Holger Hans Peter Freyther | 7bdc637 | 2010-02-20 21:21:02 +0100 | [diff] [blame] | 690 | /* Initialize all endpoints */ |
| 691 | cfg->endpoints = _talloc_zero_array(cfg, |
| 692 | sizeof(struct mgcp_endpoint), |
| 693 | cfg->number_endpoints, "endpoints"); |
| 694 | if (!cfg->endpoints) |
| 695 | return -1; |
| 696 | |
| 697 | for (i = 0; i < cfg->number_endpoints; ++i) { |
| 698 | cfg->endpoints[i].local_rtp.fd = -1; |
| 699 | cfg->endpoints[i].local_rtcp.fd = -1; |
| 700 | cfg->endpoints[i].ci = CI_UNUSED; |
| 701 | cfg->endpoints[i].cfg = cfg; |
Holger Hans Peter Freyther | ef6bb25 | 2010-02-26 13:41:22 +0100 | [diff] [blame] | 702 | cfg->endpoints[i].net_payload_type = -1; |
| 703 | cfg->endpoints[i].bts_payload_type = -1; |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 704 | } |
| 705 | |
Holger Hans Peter Freyther | e095502 | 2010-02-03 08:50:33 +0100 | [diff] [blame] | 706 | return 0; |
| 707 | } |
Holger Hans Peter Freyther | 154b955 | 2010-02-26 13:27:51 +0100 | [diff] [blame] | 708 | |
| 709 | void mgcp_free_endp(struct mgcp_endpoint *endp) |
| 710 | { |
Holger Hans Peter Freyther | c77efdf | 2010-03-31 12:31:09 +0200 | [diff] [blame] | 711 | LOGP(DMGCP, LOGL_DEBUG, "Deleting endpoint on: 0x%x\n", ENDPOINT_NUMBER(endp)); |
Holger Hans Peter Freyther | 154b955 | 2010-02-26 13:27:51 +0100 | [diff] [blame] | 712 | endp->ci= CI_UNUSED; |
| 713 | |
| 714 | if (endp->callid) { |
| 715 | talloc_free(endp->callid); |
| 716 | endp->callid = NULL; |
| 717 | } |
| 718 | |
| 719 | if (endp->local_options) { |
| 720 | talloc_free(endp->local_options); |
Holger Hans Peter Freyther | 88c6eea | 2010-03-01 18:52:04 +0100 | [diff] [blame] | 721 | endp->local_options = NULL; |
Holger Hans Peter Freyther | 154b955 | 2010-02-26 13:27:51 +0100 | [diff] [blame] | 722 | } |
| 723 | |
| 724 | if (!endp->cfg->early_bind) { |
| 725 | bsc_unregister_fd(&endp->local_rtp); |
| 726 | bsc_unregister_fd(&endp->local_rtcp); |
| 727 | } |
| 728 | |
| 729 | endp->net_rtp = endp->net_rtcp = endp->bts_rtp = endp->bts_rtcp = 0; |
| 730 | endp->net_payload_type = endp->bts_payload_type = -1; |
| 731 | } |