| /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| /* The protocol implementation */ |
| |
| /* |
| * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009-2012 by On-Waves |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero General Public License as published by |
| * the Free Software Foundation; either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <ctype.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <time.h> |
| #include <limits.h> |
| #include <unistd.h> |
| |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/select.h> |
| |
| #include <openbsc/mgcp.h> |
| #include <openbsc/mgcp_internal.h> |
| |
| #define for_each_line(line, save) \ |
| for (line = strtok_r(NULL, "\r\n", &save); line;\ |
| line = strtok_r(NULL, "\r\n", &save)) |
| |
| static void mgcp_rtp_end_reset(struct mgcp_rtp_end *end); |
| |
| struct mgcp_parse_data { |
| struct mgcp_config *cfg; |
| struct mgcp_endpoint *endp; |
| char *trans; |
| char *save; |
| int found; |
| }; |
| |
| struct mgcp_request { |
| char *name; |
| struct msgb *(*handle_request) (struct mgcp_parse_data *data); |
| char *debug_name; |
| }; |
| |
| #define MGCP_REQUEST(NAME, REQ, DEBUG_NAME) \ |
| { .name = NAME, .handle_request = REQ, .debug_name = DEBUG_NAME }, |
| |
| static struct msgb *handle_audit_endpoint(struct mgcp_parse_data *data); |
| static struct msgb *handle_create_con(struct mgcp_parse_data *data); |
| static struct msgb *handle_delete_con(struct mgcp_parse_data *data); |
| static struct msgb *handle_modify_con(struct mgcp_parse_data *data); |
| static struct msgb *handle_rsip(struct mgcp_parse_data *data); |
| static struct msgb *handle_noti_req(struct mgcp_parse_data *data); |
| |
| static void create_transcoder(struct mgcp_endpoint *endp); |
| static void delete_transcoder(struct mgcp_endpoint *endp); |
| |
| static int mgcp_analyze_header(struct mgcp_parse_data *parse, char *data); |
| |
| static uint32_t generate_call_id(struct mgcp_config *cfg) |
| { |
| int i; |
| |
| /* use the call id */ |
| ++cfg->last_call_id; |
| |
| /* handle wrap around */ |
| if (cfg->last_call_id == CI_UNUSED) |
| ++cfg->last_call_id; |
| |
| /* callstack can only be of size number_of_endpoints */ |
| /* verify that the call id is free, e.g. in case of overrun */ |
| for (i = 1; i < cfg->trunk.number_endpoints; ++i) |
| if (cfg->trunk.endpoints[i].ci == cfg->last_call_id) |
| return generate_call_id(cfg); |
| |
| return cfg->last_call_id; |
| } |
| |
| /* |
| * array of function pointers for handling various |
| * messages. In the future this might be binary sorted |
| * for performance reasons. |
| */ |
| static const struct mgcp_request mgcp_requests [] = { |
| MGCP_REQUEST("AUEP", handle_audit_endpoint, "AuditEndpoint") |
| MGCP_REQUEST("CRCX", handle_create_con, "CreateConnection") |
| MGCP_REQUEST("DLCX", handle_delete_con, "DeleteConnection") |
| MGCP_REQUEST("MDCX", handle_modify_con, "ModifiyConnection") |
| MGCP_REQUEST("RQNT", handle_noti_req, "NotificationRequest") |
| |
| /* SPEC extension */ |
| MGCP_REQUEST("RSIP", handle_rsip, "ReSetInProgress") |
| }; |
| |
| static struct msgb *mgcp_msgb_alloc(void) |
| { |
| struct msgb *msg; |
| msg = msgb_alloc_headroom(4096, 128, "MGCP msg"); |
| if (!msg) |
| LOGP(DMGCP, LOGL_ERROR, "Failed to msgb for MGCP data.\n"); |
| |
| return msg; |
| } |
| |
| static struct msgb *do_retransmission(const struct mgcp_endpoint *endp) |
| { |
| struct msgb *msg = mgcp_msgb_alloc(); |
| if (!msg) |
| return NULL; |
| |
| msg->l2h = msgb_put(msg, strlen(endp->last_response)); |
| memcpy(msg->l2h, endp->last_response, msgb_l2len(msg)); |
| return msg; |
| } |
| |
| static struct msgb *create_resp(struct mgcp_endpoint *endp, int code, |
| const char *txt, const char *msg, |
| const char *trans, const char *param, |
| const char *sdp) |
| { |
| int len; |
| struct msgb *res; |
| |
| res = mgcp_msgb_alloc(); |
| if (!res) |
| return NULL; |
| |
| len = snprintf((char *) res->data, 2048, "%d %s%s%s\r\n%s", |
| code, trans, txt, param ? param : "", sdp ? sdp : ""); |
| if (len < 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to sprintf MGCP response.\n"); |
| msgb_free(res); |
| return NULL; |
| } |
| |
| res->l2h = msgb_put(res, len); |
| LOGP(DMGCP, LOGL_DEBUG, "Generated response: code: %d for '%s'\n", code, res->l2h); |
| |
| /* |
| * Remember the last transmission per endpoint. |
| */ |
| if (endp) { |
| struct mgcp_trunk_config *tcfg = endp->tcfg; |
| talloc_free(endp->last_response); |
| talloc_free(endp->last_trans); |
| endp->last_trans = talloc_strdup(tcfg->endpoints, trans); |
| endp->last_response = talloc_strndup(tcfg->endpoints, |
| (const char *) res->l2h, |
| msgb_l2len(res)); |
| } |
| |
| return res; |
| } |
| |
| static struct msgb *create_ok_resp_with_param(struct mgcp_endpoint *endp, |
| int code, const char *msg, |
| const char *trans, const char *param) |
| { |
| return create_resp(endp, code, " OK", msg, trans, param, NULL); |
| } |
| |
| static struct msgb *create_ok_response(struct mgcp_endpoint *endp, |
| int code, const char *msg, const char *trans) |
| { |
| return create_ok_resp_with_param(endp, code, msg, trans, NULL); |
| } |
| |
| static struct msgb *create_err_response(struct mgcp_endpoint *endp, |
| int code, const char *msg, const char *trans) |
| { |
| return create_resp(endp, code, " FAIL", msg, trans, NULL, NULL); |
| } |
| |
| static struct msgb *create_response_with_sdp(struct mgcp_endpoint *endp, |
| const char *msg, const char *trans_id) |
| { |
| const char *addr = endp->cfg->local_ip; |
| const char *fmtp_extra = endp->bts_end.fmtp_extra; |
| char sdp_record[4096]; |
| |
| if (!addr) |
| addr = endp->cfg->source_addr; |
| |
| snprintf(sdp_record, sizeof(sdp_record) - 1, |
| "I: %u\n\n" |
| "v=0\r\n" |
| "o=- %u 23 IN IP4 %s\r\n" |
| "c=IN IP4 %s\r\n" |
| "t=0 0\r\n" |
| "m=audio %d RTP/AVP %d\r\n" |
| "a=rtpmap:%d %s\r\n" |
| "%s%s", |
| endp->ci, endp->ci, addr, addr, |
| endp->net_end.local_port, endp->bts_end.payload_type, |
| endp->bts_end.payload_type, endp->tcfg->audio_name, |
| fmtp_extra ? fmtp_extra : "", fmtp_extra ? "\r\n" : ""); |
| return create_resp(endp, 200, " OK", msg, trans_id, NULL, sdp_record); |
| } |
| |
| /* |
| * handle incoming messages: |
| * - this can be a command (four letters, space, transaction id) |
| * - or a response (three numbers, space, transaction id) |
| */ |
| struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg) |
| { |
| struct mgcp_parse_data pdata; |
| int i, code, handled = 0; |
| struct msgb *resp = NULL; |
| char *data; |
| |
| if (msgb_l2len(msg) < 4) { |
| LOGP(DMGCP, LOGL_ERROR, "msg too short: %d\n", msg->len); |
| return NULL; |
| } |
| |
| /* attempt to treat it as a response */ |
| if (sscanf((const char *)&msg->l2h[0], "%3d %*s", &code) == 1) { |
| LOGP(DMGCP, LOGL_DEBUG, "Response: Code: %d\n", code); |
| return NULL; |
| } |
| |
| msg->l3h = &msg->l2h[4]; |
| |
| |
| /* |
| * Check for a duplicate message and respond. |
| * FIXME: Verify that the msg->l3h is NULL terminated. |
| */ |
| memset(&pdata, 0, sizeof(pdata)); |
| pdata.cfg = cfg; |
| data = strtok_r((char *) msg->l3h, "\r\n", &pdata.save); |
| pdata.found = mgcp_analyze_header(&pdata, data); |
| if (pdata.endp && pdata.trans |
| && pdata.endp->last_trans |
| && strcmp(pdata.endp->last_trans, pdata.trans) == 0) { |
| return do_retransmission(pdata.endp); |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(mgcp_requests); ++i) { |
| if (strncmp(mgcp_requests[i].name, (const char *) &msg->l2h[0], 4) == 0) { |
| handled = 1; |
| resp = mgcp_requests[i].handle_request(&pdata); |
| break; |
| } |
| } |
| |
| if (!handled) |
| LOGP(DMGCP, LOGL_NOTICE, "MSG with type: '%.4s' not handled\n", &msg->l2h[0]); |
| |
| return resp; |
| } |
| |
| /** |
| * We have a null terminated string with the endpoint name here. We only |
| * support two kinds. Simple ones as seen on the BSC level and the ones |
| * seen on the trunk side. |
| */ |
| static struct mgcp_endpoint *find_e1_endpoint(struct mgcp_config *cfg, |
| const char *mgcp) |
| { |
| char *rest = NULL; |
| struct mgcp_trunk_config *tcfg; |
| int trunk, endp; |
| |
| trunk = strtoul(mgcp + 6, &rest, 10); |
| if (rest == NULL || rest[0] != '/' || trunk < 1) { |
| LOGP(DMGCP, LOGL_ERROR, "Wrong trunk name '%s'\n", mgcp); |
| return NULL; |
| } |
| |
| endp = strtoul(rest + 1, &rest, 10); |
| if (rest == NULL || rest[0] != '@') { |
| LOGP(DMGCP, LOGL_ERROR, "Wrong endpoint name '%s'\n", mgcp); |
| return NULL; |
| } |
| |
| /* signalling is on timeslot 1 */ |
| if (endp == 1) |
| return NULL; |
| |
| tcfg = mgcp_trunk_num(cfg, trunk); |
| if (!tcfg) { |
| LOGP(DMGCP, LOGL_ERROR, "The trunk %d is not declared.\n", trunk); |
| return NULL; |
| } |
| |
| if (!tcfg->endpoints) { |
| LOGP(DMGCP, LOGL_ERROR, "Endpoints of trunk %d not allocated.\n", trunk); |
| return NULL; |
| } |
| |
| if (endp < 1 || endp >= tcfg->number_endpoints) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to find endpoint '%s'\n", mgcp); |
| return NULL; |
| } |
| |
| return &tcfg->endpoints[endp]; |
| } |
| |
| static struct mgcp_endpoint *find_endpoint(struct mgcp_config *cfg, const char *mgcp) |
| { |
| char *endptr = NULL; |
| unsigned int gw = INT_MAX; |
| |
| if (strncmp(mgcp, "ds/e1", 5) == 0) { |
| return find_e1_endpoint(cfg, mgcp); |
| } else { |
| gw = strtoul(mgcp, &endptr, 16); |
| if (gw > 0 && gw < cfg->trunk.number_endpoints && strcmp(endptr, "@mgw") == 0) |
| return &cfg->trunk.endpoints[gw]; |
| } |
| |
| LOGP(DMGCP, LOGL_ERROR, "Not able to find endpoint: '%s'\n", mgcp); |
| return NULL; |
| } |
| |
| /** |
| * @returns 0 when the status line was complete and transaction_id and |
| * endp out parameters are set. |
| */ |
| static int mgcp_analyze_header(struct mgcp_parse_data *pdata, char *data) |
| { |
| int i = 0; |
| char *elem, *save = NULL; |
| |
| pdata->trans = "000000"; |
| |
| for (elem = strtok_r(data, " ", &save); elem; |
| elem = strtok_r(NULL, " ", &save)) { |
| switch (i) { |
| case 0: |
| pdata->trans = elem; |
| break; |
| case 1: |
| pdata->endp = find_endpoint(pdata->cfg, elem); |
| if (!pdata->endp) { |
| LOGP(DMGCP, LOGL_ERROR, |
| "Unable to find Endpoint `%s'\n", elem); |
| return -1; |
| } |
| break; |
| case 2: |
| if (strcmp("MGCP", elem)) { |
| LOGP(DMGCP, LOGL_ERROR, |
| "MGCP header parsing error\n"); |
| return -1; |
| } |
| break; |
| case 3: |
| if (strcmp("1.0", elem)) { |
| LOGP(DMGCP, LOGL_ERROR, "MGCP version `%s' " |
| "not supported\n", elem); |
| return -1; |
| } |
| break; |
| } |
| i++; |
| } |
| |
| if (i != 4) { |
| LOGP(DMGCP, LOGL_ERROR, "MGCP status line too short.\n"); |
| pdata->trans = "000000"; |
| pdata->endp = NULL; |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int verify_call_id(const struct mgcp_endpoint *endp, |
| const char *callid) |
| { |
| if (strcmp(endp->callid, callid) != 0) { |
| LOGP(DMGCP, LOGL_ERROR, "CallIDs does not match on 0x%x. '%s' != '%s'\n", |
| ENDPOINT_NUMBER(endp), endp->callid, callid); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int verify_ci(const struct mgcp_endpoint *endp, |
| const char *_ci) |
| { |
| uint32_t ci = strtoul(_ci, NULL, 10); |
| |
| if (ci != endp->ci) { |
| LOGP(DMGCP, LOGL_ERROR, "ConnectionIdentifiers do not match on 0x%x. %u != %s\n", |
| ENDPOINT_NUMBER(endp), endp->ci, _ci); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static struct msgb *handle_audit_endpoint(struct mgcp_parse_data *p) |
| { |
| if (p->found != 0) |
| return create_err_response(NULL, 500, "AUEP", p->trans); |
| else |
| return create_ok_response(p->endp, 200, "AUEP", p->trans); |
| } |
| |
| static int parse_conn_mode(const char *msg, int *conn_mode) |
| { |
| int ret = 0; |
| if (strcmp(msg, "recvonly") == 0) |
| *conn_mode = MGCP_CONN_RECV_ONLY; |
| else if (strcmp(msg, "sendrecv") == 0) |
| *conn_mode = MGCP_CONN_RECV_SEND; |
| else if (strcmp(msg, "sendonly") == 0) |
| *conn_mode = MGCP_CONN_SEND_ONLY; |
| else if (strcmp(msg, "loopback") == 0) |
| *conn_mode = MGCP_CONN_LOOPBACK; |
| else { |
| LOGP(DMGCP, LOGL_ERROR, "Unknown connection mode: '%s'\n", msg); |
| ret = -1; |
| } |
| |
| return ret; |
| } |
| |
| static int allocate_port(struct mgcp_endpoint *endp, struct mgcp_rtp_end *end, |
| struct mgcp_port_range *range, |
| int (*alloc)(struct mgcp_endpoint *endp, int port)) |
| { |
| int i; |
| |
| if (range->mode == PORT_ALLOC_STATIC) { |
| end->local_alloc = PORT_ALLOC_STATIC; |
| return 0; |
| } |
| |
| /* attempt to find a port */ |
| for (i = 0; i < 200; ++i) { |
| int rc; |
| |
| if (range->last_port >= range->range_end) |
| range->last_port = range->range_start; |
| |
| rc = alloc(endp, range->last_port); |
| |
| range->last_port += 2; |
| if (rc == 0) { |
| end->local_alloc = PORT_ALLOC_DYNAMIC; |
| return 0; |
| } |
| |
| } |
| |
| LOGP(DMGCP, LOGL_ERROR, "Allocating a RTP/RTCP port failed 200 times 0x%x.\n", |
| ENDPOINT_NUMBER(endp)); |
| return -1; |
| } |
| |
| static int allocate_ports(struct mgcp_endpoint *endp) |
| { |
| if (allocate_port(endp, &endp->net_end, &endp->cfg->net_ports, |
| mgcp_bind_net_rtp_port) != 0) |
| return -1; |
| |
| if (allocate_port(endp, &endp->bts_end, &endp->cfg->bts_ports, |
| mgcp_bind_bts_rtp_port) != 0) { |
| mgcp_rtp_end_reset(&endp->net_end); |
| return -1; |
| } |
| |
| if (endp->cfg->transcoder_ip && endp->tcfg->trunk_type == MGCP_TRUNK_VIRTUAL) { |
| if (allocate_port(endp, &endp->trans_net, |
| &endp->cfg->transcoder_ports, |
| mgcp_bind_trans_net_rtp_port) != 0) { |
| mgcp_rtp_end_reset(&endp->net_end); |
| mgcp_rtp_end_reset(&endp->bts_end); |
| return -1; |
| } |
| |
| if (allocate_port(endp, &endp->trans_bts, |
| &endp->cfg->transcoder_ports, |
| mgcp_bind_trans_bts_rtp_port) != 0) { |
| mgcp_rtp_end_reset(&endp->net_end); |
| mgcp_rtp_end_reset(&endp->bts_end); |
| mgcp_rtp_end_reset(&endp->trans_net); |
| return -1; |
| } |
| |
| /* remember that we have set up transcoding */ |
| endp->type = MGCP_RTP_TRANSCODED; |
| } |
| |
| return 0; |
| } |
| |
| static struct msgb *handle_create_con(struct mgcp_parse_data *p) |
| { |
| struct mgcp_trunk_config *tcfg; |
| struct mgcp_endpoint *endp = p->endp; |
| int error_code = 400; |
| |
| const char *local_options = NULL; |
| const char *callid = NULL; |
| const char *mode = NULL; |
| char *line; |
| |
| if (p->found != 0) |
| return create_err_response(NULL, 510, "CRCX", p->trans); |
| |
| /* parse CallID C: and LocalParameters L: */ |
| for_each_line(line, p->save) { |
| switch (line[0]) { |
| case 'L': |
| local_options = (const char *) line + 3; |
| break; |
| case 'C': |
| callid = (const char *) line + 3; |
| break; |
| case 'M': |
| mode = (const char *) line + 3; |
| break; |
| default: |
| LOGP(DMGCP, LOGL_NOTICE, "Unhandled option: '%c'/%d on 0x%x\n", |
| *line, *line, ENDPOINT_NUMBER(endp)); |
| break; |
| } |
| } |
| |
| tcfg = p->endp->tcfg; |
| |
| /* Check required data */ |
| if (!callid || !mode) { |
| LOGP(DMGCP, LOGL_ERROR, "Missing callid and mode in CRCX on 0x%x\n", |
| ENDPOINT_NUMBER(endp)); |
| return create_err_response(endp, 400, "CRCX", p->trans); |
| } |
| |
| if (endp->allocated) { |
| if (tcfg->force_realloc) { |
| LOGP(DMGCP, LOGL_NOTICE, "Endpoint 0x%x already allocated. Forcing realloc.\n", |
| ENDPOINT_NUMBER(endp)); |
| mgcp_free_endp(endp); |
| if (p->cfg->realloc_cb) |
| p->cfg->realloc_cb(tcfg, ENDPOINT_NUMBER(endp)); |
| } else { |
| LOGP(DMGCP, LOGL_ERROR, "Endpoint is already used. 0x%x\n", |
| ENDPOINT_NUMBER(endp)); |
| return create_err_response(endp, 400, "CRCX", p->trans); |
| } |
| } |
| |
| /* copy some parameters */ |
| endp->callid = talloc_strdup(tcfg->endpoints, callid); |
| |
| if (local_options) |
| endp->local_options = talloc_strdup(tcfg->endpoints, local_options); |
| |
| if (parse_conn_mode(mode, &endp->conn_mode) != 0) { |
| error_code = 517; |
| goto error2; |
| } |
| |
| /* initialize */ |
| endp->net_end.rtp_port = endp->net_end.rtcp_port = endp->bts_end.rtp_port = endp->bts_end.rtcp_port = 0; |
| |
| /* set to zero until we get the info */ |
| memset(&endp->net_end.addr, 0, sizeof(endp->net_end.addr)); |
| |
| /* bind to the port now */ |
| if (allocate_ports(endp) != 0) |
| goto error2; |
| |
| /* assign a local call identifier or fail */ |
| endp->ci = generate_call_id(p->cfg); |
| if (endp->ci == CI_UNUSED) |
| goto error2; |
| |
| endp->allocated = 1; |
| endp->bts_end.payload_type = tcfg->audio_payload; |
| endp->bts_end.fmtp_extra = talloc_strdup(tcfg->endpoints, |
| tcfg->audio_fmtp_extra); |
| |
| /* policy CB */ |
| if (p->cfg->policy_cb) { |
| int rc; |
| rc = p->cfg->policy_cb(tcfg, ENDPOINT_NUMBER(endp), |
| MGCP_ENDP_CRCX, p->trans); |
| switch (rc) { |
| case MGCP_POLICY_REJECT: |
| LOGP(DMGCP, LOGL_NOTICE, "CRCX rejected by policy on 0x%x\n", |
| ENDPOINT_NUMBER(endp)); |
| mgcp_free_endp(endp); |
| return create_err_response(endp, 400, "CRCX", p->trans); |
| break; |
| case MGCP_POLICY_DEFER: |
| /* stop processing */ |
| create_transcoder(endp); |
| return NULL; |
| break; |
| case MGCP_POLICY_CONT: |
| /* just continue */ |
| break; |
| } |
| } |
| |
| LOGP(DMGCP, LOGL_DEBUG, "Creating endpoint on: 0x%x CI: %u port: %u/%u\n", |
| ENDPOINT_NUMBER(endp), endp->ci, |
| endp->net_end.local_port, endp->bts_end.local_port); |
| if (p->cfg->change_cb) |
| p->cfg->change_cb(tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_CRCX); |
| |
| create_transcoder(endp); |
| return create_response_with_sdp(endp, "CRCX", p->trans); |
| error2: |
| mgcp_free_endp(endp); |
| LOGP(DMGCP, LOGL_NOTICE, "Resource error on 0x%x\n", ENDPOINT_NUMBER(endp)); |
| return create_err_response(endp, error_code, "CRCX", p->trans); |
| } |
| |
| static struct msgb *handle_modify_con(struct mgcp_parse_data *p) |
| { |
| struct mgcp_endpoint *endp = p->endp; |
| int error_code = 500; |
| int silent = 0; |
| char *line; |
| |
| if (p->found != 0) |
| return create_err_response(NULL, 510, "MDCX", p->trans); |
| |
| if (endp->ci == CI_UNUSED) { |
| LOGP(DMGCP, LOGL_ERROR, "Endpoint is not " |
| "holding a connection. 0x%x\n", ENDPOINT_NUMBER(endp)); |
| return create_err_response(endp, 400, "MDCX", p->trans); |
| } |
| |
| for_each_line(line, p->save) { |
| switch (line[0]) { |
| case 'C': { |
| if (verify_call_id(endp, line + 3) != 0) |
| goto error3; |
| break; |
| } |
| case 'I': { |
| if (verify_ci(endp, line + 3) != 0) |
| goto error3; |
| break; |
| } |
| case 'L': |
| /* skip */ |
| break; |
| case 'M': |
| if (parse_conn_mode(line + 3, &endp->conn_mode) != 0) { |
| error_code = 517; |
| goto error3; |
| } |
| endp->orig_mode = endp->conn_mode; |
| break; |
| case 'Z': |
| silent = strcmp("noanswer", line + 3) == 0; |
| break; |
| case '\0': |
| /* SDP file begins */ |
| break; |
| case 'a': |
| case 'o': |
| case 's': |
| case 't': |
| case 'v': |
| /* skip these SDP attributes */ |
| break; |
| case 'm': { |
| int port; |
| int payload; |
| |
| if (sscanf(line, "m=audio %d RTP/AVP %d", &port, &payload) == 2) { |
| endp->net_end.rtp_port = htons(port); |
| endp->net_end.rtcp_port = htons(port + 1); |
| endp->net_end.payload_type = payload; |
| } |
| break; |
| } |
| case 'c': { |
| char ipv4[16]; |
| |
| if (sscanf(line, "c=IN IP4 %15s", ipv4) == 1) { |
| inet_aton(ipv4, &endp->net_end.addr); |
| } |
| break; |
| } |
| default: |
| LOGP(DMGCP, LOGL_NOTICE, "Unhandled option: '%c'/%d on 0x%x\n", |
| line[0], line[0], ENDPOINT_NUMBER(endp)); |
| break; |
| } |
| } |
| |
| /* policy CB */ |
| if (p->cfg->policy_cb) { |
| int rc; |
| rc = p->cfg->policy_cb(endp->tcfg, ENDPOINT_NUMBER(endp), |
| MGCP_ENDP_MDCX, p->trans); |
| switch (rc) { |
| case MGCP_POLICY_REJECT: |
| LOGP(DMGCP, LOGL_NOTICE, "MDCX rejected by policy on 0x%x\n", |
| ENDPOINT_NUMBER(endp)); |
| if (silent) |
| goto out_silent; |
| return create_err_response(endp, 400, "MDCX", p->trans); |
| break; |
| case MGCP_POLICY_DEFER: |
| /* stop processing */ |
| return NULL; |
| break; |
| case MGCP_POLICY_CONT: |
| /* just continue */ |
| break; |
| } |
| } |
| |
| /* modify */ |
| LOGP(DMGCP, LOGL_DEBUG, "Modified endpoint on: 0x%x Server: %s:%u\n", |
| ENDPOINT_NUMBER(endp), inet_ntoa(endp->net_end.addr), ntohs(endp->net_end.rtp_port)); |
| if (p->cfg->change_cb) |
| p->cfg->change_cb(endp->tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_MDCX); |
| if (silent) |
| goto out_silent; |
| |
| return create_response_with_sdp(endp, "MDCX", p->trans); |
| |
| error3: |
| return create_err_response(endp, error_code, "MDCX", p->trans); |
| |
| |
| out_silent: |
| return NULL; |
| } |
| |
| static struct msgb *handle_delete_con(struct mgcp_parse_data *p) |
| { |
| struct mgcp_endpoint *endp = p->endp; |
| int error_code = 400; |
| int silent = 0; |
| char *line; |
| char stats[1048]; |
| |
| if (p->found != 0) |
| return create_err_response(NULL, error_code, "DLCX", p->trans); |
| |
| if (!p->endp->allocated) { |
| LOGP(DMGCP, LOGL_ERROR, "Endpoint is not used. 0x%x\n", |
| ENDPOINT_NUMBER(endp)); |
| return create_err_response(endp, 400, "DLCX", p->trans); |
| } |
| |
| for_each_line(line, p->save) { |
| switch (line[0]) { |
| case 'C': |
| if (verify_call_id(endp, line + 3) != 0) |
| goto error3; |
| break; |
| case 'I': |
| if (verify_ci(endp, line + 3) != 0) |
| goto error3; |
| break; |
| case 'Z': |
| silent = strcmp("noanswer", line + 3) == 0; |
| break; |
| default: |
| LOGP(DMGCP, LOGL_NOTICE, "Unhandled option: '%c'/%d on 0x%x\n", |
| line[0], line[0], ENDPOINT_NUMBER(endp)); |
| break; |
| } |
| } |
| |
| /* policy CB */ |
| if (p->cfg->policy_cb) { |
| int rc; |
| rc = p->cfg->policy_cb(endp->tcfg, ENDPOINT_NUMBER(endp), |
| MGCP_ENDP_DLCX, p->trans); |
| switch (rc) { |
| case MGCP_POLICY_REJECT: |
| LOGP(DMGCP, LOGL_NOTICE, "DLCX rejected by policy on 0x%x\n", |
| ENDPOINT_NUMBER(endp)); |
| if (silent) |
| goto out_silent; |
| return create_err_response(endp, 400, "DLCX", p->trans); |
| break; |
| case MGCP_POLICY_DEFER: |
| /* stop processing */ |
| delete_transcoder(endp); |
| return NULL; |
| break; |
| case MGCP_POLICY_CONT: |
| /* just continue */ |
| break; |
| } |
| } |
| |
| /* free the connection */ |
| LOGP(DMGCP, LOGL_DEBUG, "Deleted endpoint on: 0x%x Server: %s:%u\n", |
| ENDPOINT_NUMBER(endp), inet_ntoa(endp->net_end.addr), ntohs(endp->net_end.rtp_port)); |
| |
| /* save the statistics of the current call */ |
| mgcp_format_stats(endp, stats, sizeof(stats)); |
| |
| delete_transcoder(endp); |
| mgcp_free_endp(endp); |
| if (p->cfg->change_cb) |
| p->cfg->change_cb(endp->tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_DLCX); |
| |
| if (silent) |
| goto out_silent; |
| return create_ok_resp_with_param(endp, 250, "DLCX", p->trans, stats); |
| |
| error3: |
| return create_err_response(endp, error_code, "DLCX", p->trans); |
| |
| out_silent: |
| return NULL; |
| } |
| |
| static struct msgb *handle_rsip(struct mgcp_parse_data *p) |
| { |
| if (p->found != 0) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to find the endpoint.\n"); |
| return NULL; |
| } |
| |
| if (p->cfg->reset_cb) |
| p->cfg->reset_cb(p->endp->tcfg); |
| return NULL; |
| } |
| |
| static char extract_tone(const char *line) |
| { |
| const char *str = strstr(line, "D/"); |
| if (!str) |
| return CHAR_MAX; |
| |
| return str[2]; |
| } |
| |
| /* |
| * This can request like DTMF detection and forward, fax detection... it |
| * can also request when the notification should be send and such. We don't |
| * do this right now. |
| */ |
| static struct msgb *handle_noti_req(struct mgcp_parse_data *p) |
| { |
| int res = 0; |
| char *line; |
| char tone = CHAR_MAX; |
| |
| if (p->found != 0) |
| return create_err_response(NULL, 400, "RQNT", p->trans); |
| |
| for_each_line(line, p->save) { |
| switch (line[0]) { |
| case 'S': |
| tone = extract_tone(line); |
| break; |
| } |
| } |
| |
| /* we didn't see a signal request with a tone */ |
| if (tone == CHAR_MAX) |
| return create_ok_response(p->endp, 200, "RQNT", p->trans); |
| |
| if (p->cfg->rqnt_cb) |
| res = p->cfg->rqnt_cb(p->endp, tone); |
| |
| return res == 0 ? |
| create_ok_response(p->endp, 200, "RQNT", p->trans) : |
| create_err_response(p->endp, res, "RQNT", p->trans); |
| } |
| |
| struct mgcp_config *mgcp_config_alloc(void) |
| { |
| struct mgcp_config *cfg; |
| |
| cfg = talloc_zero(NULL, struct mgcp_config); |
| if (!cfg) { |
| LOGP(DMGCP, LOGL_FATAL, "Failed to allocate config.\n"); |
| return NULL; |
| } |
| |
| cfg->source_port = 2427; |
| cfg->source_addr = talloc_strdup(cfg, "0.0.0.0"); |
| |
| cfg->transcoder_remote_base = 4000; |
| |
| cfg->bts_ports.base_port = RTP_PORT_DEFAULT; |
| cfg->net_ports.base_port = RTP_PORT_NET_DEFAULT; |
| |
| /* default trunk handling */ |
| cfg->trunk.cfg = cfg; |
| cfg->trunk.trunk_nr = 0; |
| cfg->trunk.trunk_type = MGCP_TRUNK_VIRTUAL; |
| cfg->trunk.audio_name = talloc_strdup(cfg, "AMR/8000"); |
| cfg->trunk.audio_payload = 126; |
| cfg->trunk.omit_rtcp = 0; |
| |
| INIT_LLIST_HEAD(&cfg->trunks); |
| |
| return cfg; |
| } |
| |
| struct mgcp_trunk_config *mgcp_trunk_alloc(struct mgcp_config *cfg, int nr) |
| { |
| struct mgcp_trunk_config *trunk; |
| |
| trunk = talloc_zero(cfg, struct mgcp_trunk_config); |
| if (!trunk) { |
| LOGP(DMGCP, LOGL_ERROR, "Failed to allocate.\n"); |
| return NULL; |
| } |
| |
| trunk->cfg = cfg; |
| trunk->trunk_type = MGCP_TRUNK_E1; |
| trunk->trunk_nr = nr; |
| trunk->audio_name = talloc_strdup(cfg, "AMR/8000"); |
| trunk->audio_payload = 126; |
| trunk->number_endpoints = 33; |
| trunk->omit_rtcp = 0; |
| llist_add_tail(&trunk->entry, &cfg->trunks); |
| return trunk; |
| } |
| |
| struct mgcp_trunk_config *mgcp_trunk_num(struct mgcp_config *cfg, int index) |
| { |
| struct mgcp_trunk_config *trunk; |
| |
| llist_for_each_entry(trunk, &cfg->trunks, entry) |
| if (trunk->trunk_nr == index) |
| return trunk; |
| |
| return NULL; |
| } |
| |
| static void mgcp_rtp_end_reset(struct mgcp_rtp_end *end) |
| { |
| if (end->local_alloc == PORT_ALLOC_DYNAMIC) { |
| mgcp_free_rtp_port(end); |
| end->local_port = 0; |
| } |
| |
| end->packets = 0; |
| end->octets = 0; |
| memset(&end->addr, 0, sizeof(end->addr)); |
| end->rtp_port = end->rtcp_port = 0; |
| end->payload_type = -1; |
| end->local_alloc = -1; |
| talloc_free(end->fmtp_extra); |
| end->fmtp_extra = NULL; |
| } |
| |
| static void mgcp_rtp_end_init(struct mgcp_rtp_end *end) |
| { |
| mgcp_rtp_end_reset(end); |
| end->rtp.fd = -1; |
| end->rtcp.fd = -1; |
| } |
| |
| int mgcp_endpoints_allocate(struct mgcp_trunk_config *tcfg) |
| { |
| int i; |
| |
| /* Initialize all endpoints */ |
| tcfg->endpoints = _talloc_zero_array(tcfg->cfg, |
| sizeof(struct mgcp_endpoint), |
| tcfg->number_endpoints, "endpoints"); |
| if (!tcfg->endpoints) |
| return -1; |
| |
| for (i = 0; i < tcfg->number_endpoints; ++i) { |
| tcfg->endpoints[i].ci = CI_UNUSED; |
| tcfg->endpoints[i].cfg = tcfg->cfg; |
| tcfg->endpoints[i].tcfg = tcfg; |
| mgcp_rtp_end_init(&tcfg->endpoints[i].net_end); |
| mgcp_rtp_end_init(&tcfg->endpoints[i].bts_end); |
| mgcp_rtp_end_init(&tcfg->endpoints[i].trans_net); |
| mgcp_rtp_end_init(&tcfg->endpoints[i].trans_bts); |
| } |
| |
| return 0; |
| } |
| |
| void mgcp_free_endp(struct mgcp_endpoint *endp) |
| { |
| LOGP(DMGCP, LOGL_DEBUG, "Deleting endpoint on: 0x%x\n", ENDPOINT_NUMBER(endp)); |
| endp->ci = CI_UNUSED; |
| endp->allocated = 0; |
| |
| talloc_free(endp->callid); |
| endp->callid = NULL; |
| |
| talloc_free(endp->local_options); |
| endp->local_options = NULL; |
| |
| mgcp_rtp_end_reset(&endp->bts_end); |
| mgcp_rtp_end_reset(&endp->net_end); |
| mgcp_rtp_end_reset(&endp->trans_net); |
| mgcp_rtp_end_reset(&endp->trans_bts); |
| endp->type = MGCP_RTP_DEFAULT; |
| |
| memset(&endp->net_state, 0, sizeof(endp->net_state)); |
| memset(&endp->bts_state, 0, sizeof(endp->bts_state)); |
| |
| endp->conn_mode = endp->orig_mode = MGCP_CONN_NONE; |
| endp->allow_patch = 0; |
| |
| memset(&endp->taps, 0, sizeof(endp->taps)); |
| } |
| |
| static int send_trans(struct mgcp_config *cfg, const char *buf, int len) |
| { |
| struct sockaddr_in addr; |
| |
| memset(&addr, 0, sizeof(addr)); |
| addr.sin_family = AF_INET; |
| addr.sin_addr = cfg->transcoder_in; |
| addr.sin_port = htons(2427); |
| return sendto(cfg->gw_fd.bfd.fd, buf, len, 0, |
| (struct sockaddr *) &addr, sizeof(addr)); |
| } |
| |
| static void send_msg(struct mgcp_endpoint *endp, int endpoint, int port, |
| const char *msg, const char *mode) |
| { |
| char buf[2096]; |
| int len; |
| |
| /* hardcoded to AMR right now, we do not know the real type at this point */ |
| len = snprintf(buf, sizeof(buf), |
| "%s 42 %x@mgw MGCP 1.0\r\n" |
| "C: 4256\r\n" |
| "M: %s\r\n" |
| "\r\n" |
| "c=IN IP4 %s\r\n" |
| "m=audio %d RTP/AVP %d\r\n" |
| "a=rtpmap:%d %s\r\n", |
| msg, endpoint, mode, endp->cfg->source_addr, |
| port, endp->tcfg->audio_payload, |
| endp->tcfg->audio_payload, endp->tcfg->audio_name); |
| |
| if (len < 0) |
| return; |
| |
| buf[sizeof(buf) - 1] = '\0'; |
| |
| send_trans(endp->cfg, buf, len); |
| } |
| |
| static void send_dlcx(struct mgcp_endpoint *endp, int endpoint) |
| { |
| char buf[2096]; |
| int len; |
| |
| len = snprintf(buf, sizeof(buf), |
| "DLCX 43 %x@mgw MGCP 1.0\r\n" |
| "C: 4256\r\n" |
| , endpoint); |
| |
| if (len < 0) |
| return; |
| |
| buf[sizeof(buf) - 1] = '\0'; |
| |
| send_trans(endp->cfg, buf, len); |
| } |
| |
| static int send_agent(struct mgcp_config *cfg, const char *buf, int len) |
| { |
| return write(cfg->gw_fd.bfd.fd, buf, len); |
| } |
| |
| int mgcp_send_reset_all(struct mgcp_config *cfg) |
| { |
| static const char mgcp_reset[] = { |
| "RSIP 1 *@mgw MGCP 1.0\r\n" |
| }; |
| |
| return send_agent(cfg, mgcp_reset, sizeof mgcp_reset -1); |
| } |
| |
| int mgcp_send_reset_ep(struct mgcp_endpoint *endp, int endpoint) |
| { |
| char buf[128]; |
| int len; |
| |
| len = snprintf(buf, sizeof(buf), |
| "RSIP 39 %x@mgw MGCP 1.0\r\n" |
| , endpoint); |
| if (len < 0) |
| return len; |
| |
| buf[sizeof(buf) - 1] = '\0'; |
| |
| return send_agent(endp->cfg, buf, len); |
| } |
| |
| static void create_transcoder(struct mgcp_endpoint *endp) |
| { |
| int port; |
| int in_endp = ENDPOINT_NUMBER(endp); |
| int out_endp = endp_back_channel(in_endp); |
| |
| if (endp->type != MGCP_RTP_TRANSCODED) |
| return; |
| |
| send_msg(endp, in_endp, endp->trans_bts.local_port, "CRCX", "sendrecv"); |
| send_msg(endp, in_endp, endp->trans_bts.local_port, "MDCX", "sendrecv"); |
| send_msg(endp, out_endp, endp->trans_net.local_port, "CRCX", "sendrecv"); |
| send_msg(endp, out_endp, endp->trans_net.local_port, "MDCX", "sendrecv"); |
| |
| port = rtp_calculate_port(in_endp, endp->cfg->transcoder_remote_base); |
| endp->trans_bts.rtp_port = htons(port); |
| endp->trans_bts.rtcp_port = htons(port + 1); |
| |
| port = rtp_calculate_port(out_endp, endp->cfg->transcoder_remote_base); |
| endp->trans_net.rtp_port = htons(port); |
| endp->trans_net.rtcp_port = htons(port + 1); |
| } |
| |
| static void delete_transcoder(struct mgcp_endpoint *endp) |
| { |
| int in_endp = ENDPOINT_NUMBER(endp); |
| int out_endp = endp_back_channel(in_endp); |
| |
| if (endp->type != MGCP_RTP_TRANSCODED) |
| return; |
| |
| send_dlcx(endp, in_endp); |
| send_dlcx(endp, out_endp); |
| } |
| |
| int mgcp_reset_transcoder(struct mgcp_config *cfg) |
| { |
| if (!cfg->transcoder_ip) |
| return 0; |
| |
| static const char mgcp_reset[] = { |
| "RSIP 1 13@mgw MGCP 1.0\r\n" |
| }; |
| |
| return send_trans(cfg, mgcp_reset, sizeof mgcp_reset -1); |
| } |
| |
| void mgcp_format_stats(struct mgcp_endpoint *endp, char *msg, size_t size) |
| { |
| uint32_t expected, jitter; |
| int ploss; |
| mgcp_state_calc_loss(&endp->net_state, &endp->net_end, |
| &expected, &ploss); |
| jitter = mgcp_state_calc_jitter(&endp->net_state); |
| |
| snprintf(msg, size, "\r\nP: PS=%u, OS=%u, PR=%u, OR=%u, PL=%d, JI=%u", |
| endp->bts_end.packets, endp->bts_end.octets, |
| endp->net_end.packets, endp->net_end.octets, |
| ploss, jitter); |
| msg[size - 1] = '\0'; |
| } |
| |
| int mgcp_parse_stats(struct msgb *msg, uint32_t *ps, uint32_t *os, |
| uint32_t *pr, uint32_t *_or, int *loss, uint32_t *jitter) |
| { |
| char *line, *save; |
| int rc; |
| |
| /* initialize with bad values */ |
| *ps = *os = *pr = *_or = *jitter = UINT_MAX; |
| *loss = INT_MAX; |
| |
| |
| line = strtok_r((char *) msg->l2h, "\r\n", &save); |
| if (!line) |
| return -1; |
| |
| /* this can only parse the message that is created above... */ |
| for_each_line(line, save) { |
| switch (line[0]) { |
| case 'P': |
| rc = sscanf(line, "P: PS=%u, OS=%u, PR=%u, OR=%u, PL=%d, JI=%u", |
| ps, os, pr, _or, loss, jitter); |
| return rc == 6 ? 0 : -1; |
| } |
| } |
| |
| return -1; |
| } |