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authorHarald Welte <laforge@gnumonks.org>2011-03-04 13:18:30 +0100
committerHarald Welte <laforge@gnumonks.org>2011-03-04 13:23:09 +0100
commit89579b4317a7f7ab6ee706399bee4b8f25a12c3a (patch)
tree8e66e64f14e582cd29f6b78023528297b71548ba /openbsc/src/mgcp/mgcp_protocol.c
parent5a6b68f4169c0ef55dca02a9644ee8f3bbc97e60 (diff)
prefix sub-directories containing libraries with 'lib'
... and make sure tests work again after restructuring
Diffstat (limited to 'openbsc/src/mgcp/mgcp_protocol.c')
-rw-r--r--openbsc/src/mgcp/mgcp_protocol.c1102
1 files changed, 0 insertions, 1102 deletions
diff --git a/openbsc/src/mgcp/mgcp_protocol.c b/openbsc/src/mgcp/mgcp_protocol.c
deleted file mode 100644
index ba290dd9..00000000
--- a/openbsc/src/mgcp/mgcp_protocol.c
+++ /dev/null
@@ -1,1102 +0,0 @@
-/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
-/* The protocol implementation */
-
-/*
- * (C) 2009-2011 by Holger Hans Peter Freyther <zecke@selfish.org>
- * (C) 2009-2011 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 <openbsc/debug.h>
-#include <osmocore/msgb.h>
-#include <osmocore/talloc.h>
-#include <openbsc/gsm_data.h>
-#include <osmocore/select.h>
-#include <openbsc/mgcp.h>
-#include <openbsc/mgcp_internal.h>
-
-/**
- * Macro for tokenizing MGCP messages and SDP in one go.
- *
- */
-#define MSG_TOKENIZE_START \
- line_start = 0; \
- for (i = 0; i < msgb_l3len(msg); ++i) { \
- /* we have a line end */ \
- if (msg->l3h[i] == '\n') { \
- /* skip the first line */ \
- if (line_start == 0) { \
- line_start = i + 1; \
- continue; \
- } \
- \
- /* check if we have a proper param */ \
- if (i - line_start == 1 && msg->l3h[line_start] == '\r') { \
- } else if (i - line_start > 2 \
- && islower(msg->l3h[line_start]) \
- && msg->l3h[line_start + 1] == '=') { \
- } else if (i - line_start < 3 \
- || msg->l3h[line_start + 1] != ':' \
- || msg->l3h[line_start + 2] != ' ') \
- goto error; \
- \
- msg->l3h[i] = '\0'; \
- if (msg->l3h[i-1] == '\r') \
- msg->l3h[i-1] = '\0';
-
-#define MSG_TOKENIZE_END \
- line_start = i + 1; \
- } \
- }
-
-static void mgcp_rtp_end_reset(struct mgcp_rtp_end *end);
-
-struct mgcp_request {
- char *name;
- struct msgb *(*handle_request) (struct mgcp_config *cfg, struct msgb *msg);
- 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_config *cfg, struct msgb *msg);
-static struct msgb *handle_create_con(struct mgcp_config *cfg, struct msgb *msg);
-static struct msgb *handle_delete_con(struct mgcp_config *cfg, struct msgb *msg);
-static struct msgb *handle_modify_con(struct mgcp_config *cfg, struct msgb *msg);
-static struct msgb *handle_rsip(struct mgcp_config *cfg, struct msgb *msg);
-static struct msgb *handle_noti_req(struct mgcp_config *cfg, struct msgb *msg);
-
-static void create_transcoder(struct mgcp_endpoint *endp);
-static void delete_transcoder(struct mgcp_endpoint *endp);
-
-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;
-}
-
-struct msgb *mgcp_create_response_with_data(int code, const char *txt,
- const char *msg, const char *trans,
- const char *data)
-{
- int len;
- struct msgb *res;
-
- res = mgcp_msgb_alloc();
- if (!res)
- return NULL;
-
- if (data) {
- len = snprintf((char *) res->data, 2048, "%d %s%s\r\n%s", code, trans, txt, data);
- } else {
- len = snprintf((char *) res->data, 2048, "%d %s%s\r\n", code, trans, txt);
- }
-
- res->l2h = msgb_put(res, len);
- LOGP(DMGCP, LOGL_DEBUG, "Sending response: code: %d for '%s'\n", code, res->l2h);
- return res;
-}
-
-static struct msgb *create_ok_response(int code, const char *msg, const char *trans)
-{
- return mgcp_create_response_with_data(code, " OK", msg, trans, NULL);
-}
-
-static struct msgb *create_err_response(int code, const char *msg, const char *trans)
-{
- return mgcp_create_response_with_data(code, " FAIL", msg, trans, 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;
- 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"
- "c=IN IP4 %s\r\n"
- "m=audio %d RTP/AVP %d\r\n"
- "a=rtpmap:%d %s\r\n",
- endp->ci, addr, endp->net_end.local_port,
- endp->bts_end.payload_type, endp->bts_end.payload_type,
- endp->tcfg->audio_name);
- return mgcp_create_response_with_data(200, " OK", msg, trans_id, 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)
-{
- int code;
- struct msgb *resp = NULL;
-
- if (msgb_l2len(msg) < 4) {
- LOGP(DMGCP, LOGL_ERROR, "mgs 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);
- } else {
- int i, handled = 0;
- msg->l3h = &msg->l2h[4];
- 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(cfg, msg);
- break;
- }
- if (!handled) {
- LOGP(DMGCP, LOGL_NOTICE, "MSG with type: '%.4s' not handled\n", &msg->l2h[0]);
- }
- }
-
- return resp;
-}
-
-/* string tokenizer for the poor */
-static int find_msg_pointers(struct msgb *msg, struct mgcp_msg_ptr *ptrs, int ptrs_length)
-{
- int i, found = 0;
-
- int whitespace = 1;
- for (i = 0; i < msgb_l3len(msg) && ptrs_length > 0; ++i) {
- /* if we have a space we found an end */
- if (msg->l3h[i] == ' ' || msg->l3h[i] == '\r' || msg->l3h[i] == '\n') {
- if (!whitespace) {
- ++found;
- whitespace = 1;
- ptrs->length = i - ptrs->start - 1;
- ++ptrs;
- --ptrs_length;
- } else {
- /* skip any number of whitespace */
- }
-
- /* line end... stop */
- if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n')
- break;
- } else if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n') {
- /* line end, be done */
- break;
- } else if (whitespace) {
- whitespace = 0;
- ptrs->start = i;
- }
- }
-
- if (ptrs_length == 0)
- return -1;
- return found;
-}
-
-/**
- * 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;
-}
-
-int mgcp_analyze_header(struct mgcp_config *cfg, struct msgb *msg,
- struct mgcp_msg_ptr *ptr, int size,
- const char **transaction_id, struct mgcp_endpoint **endp)
-{
- int found;
-
- *transaction_id = "000000";
-
- if (size < 3) {
- LOGP(DMGCP, LOGL_ERROR, "Not enough space in ptr\n");
- return -1;
- }
-
- found = find_msg_pointers(msg, ptr, size);
-
- if (found <= 3) {
- LOGP(DMGCP, LOGL_ERROR, "Gateway: Not enough params. Found: %d\n", found);
- return -1;
- }
-
- /*
- * replace the space with \0. the main method gurantess that
- * we still have + 1 for null termination
- */
- msg->l3h[ptr[3].start + ptr[3].length + 1] = '\0';
- msg->l3h[ptr[2].start + ptr[2].length + 1] = '\0';
- msg->l3h[ptr[1].start + ptr[1].length + 1] = '\0';
- msg->l3h[ptr[0].start + ptr[0].length + 1] = '\0';
-
- if (strncmp("1.0", (const char *)&msg->l3h[ptr[3].start], 3) != 0
- || strncmp("MGCP", (const char *)&msg->l3h[ptr[2].start], 4) != 0) {
- LOGP(DMGCP, LOGL_ERROR, "Wrong MGCP version. Not handling: '%s' '%s'\n",
- (const char *)&msg->l3h[ptr[3].start],
- (const char *)&msg->l3h[ptr[2].start]);
- return -1;
- }
-
- *transaction_id = (const char *)&msg->l3h[ptr[0].start];
- if (endp) {
- *endp = find_endpoint(cfg, (const char *)&msg->l3h[ptr[1].start]);
- return *endp == NULL;
- }
- 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_config *cfg, struct msgb *msg)
-{
- struct mgcp_msg_ptr data_ptrs[6];
- int found;
- const char *trans_id;
- struct mgcp_endpoint *endp;
-
- found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
- if (found != 0)
- return create_err_response(500, "AUEP", trans_id);
- else
- return create_ok_response(200, "AUEP", trans_id);
-}
-
-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->is_transcoded = 1;
- }
-
- return 0;
-}
-
-static struct msgb *handle_create_con(struct mgcp_config *cfg, struct msgb *msg)
-{
- struct mgcp_msg_ptr data_ptrs[6];
- int found, i, line_start;
- const char *trans_id;
- struct mgcp_trunk_config *tcfg;
- struct mgcp_endpoint *endp;
- int error_code = 400;
-
- found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
- if (found != 0)
- return create_err_response(510, "CRCX", trans_id);
-
- tcfg = endp->tcfg;
-
- 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 (cfg->realloc_cb)
- 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(400, "CRCX", trans_id);
- }
- }
-
- /* parse CallID C: and LocalParameters L: */
- MSG_TOKENIZE_START
- switch (msg->l3h[line_start]) {
- case 'L':
- endp->local_options = talloc_strdup(tcfg->endpoints,
- (const char *)&msg->l3h[line_start + 3]);
- break;
- case 'C':
- endp->callid = talloc_strdup(tcfg->endpoints,
- (const char *)&msg->l3h[line_start + 3]);
- break;
- case 'M':
- if (parse_conn_mode((const char *)&msg->l3h[line_start + 3],
- &endp->conn_mode) != 0) {
- error_code = 517;
- goto error2;
- }
-
- endp->orig_mode = endp->conn_mode;
- break;
- default:
- LOGP(DMGCP, LOGL_NOTICE, "Unhandled option: '%c'/%d on 0x%x\n",
- msg->l3h[line_start], msg->l3h[line_start],
- ENDPOINT_NUMBER(endp));
- break;
- }
- MSG_TOKENIZE_END
-
- /* 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(cfg);
- if (endp->ci == CI_UNUSED)
- goto error2;
-
- endp->allocated = 1;
- endp->bts_end.payload_type = tcfg->audio_payload;
-
- /* policy CB */
- if (cfg->policy_cb) {
- switch (cfg->policy_cb(tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_CRCX, trans_id)) {
- 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(400, "CRCX", trans_id);
- 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 (cfg->change_cb)
- cfg->change_cb(tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_CRCX);
-
- create_transcoder(endp);
- return create_response_with_sdp(endp, "CRCX", trans_id);
-error:
- LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d\n",
- hexdump(msg->l3h, msgb_l3len(msg)),
- ENDPOINT_NUMBER(endp), line_start, i);
- return create_err_response(error_code, "CRCX", trans_id);
-
-error2:
- mgcp_free_endp(endp);
- LOGP(DMGCP, LOGL_NOTICE, "Resource error on 0x%x\n", ENDPOINT_NUMBER(endp));
- return create_err_response(error_code, "CRCX", trans_id);
-}
-
-static struct msgb *handle_modify_con(struct mgcp_config *cfg, struct msgb *msg)
-{
- struct mgcp_msg_ptr data_ptrs[6];
- int found, i, line_start;
- const char *trans_id;
- struct mgcp_endpoint *endp;
- int error_code = 500;
- int silent = 0;
-
- found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
- if (found != 0)
- return create_err_response(510, "MDCX", trans_id);
-
- 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(400, "MDCX", trans_id);
- }
-
- MSG_TOKENIZE_START
- switch (msg->l3h[line_start]) {
- case 'C': {
- if (verify_call_id(endp, (const char *)&msg->l3h[line_start + 3]) != 0)
- goto error3;
- break;
- }
- case 'I': {
- if (verify_ci(endp, (const char *)&msg->l3h[line_start + 3]) != 0)
- goto error3;
- break;
- }
- case 'L':
- /* skip */
- break;
- case 'M':
- if (parse_conn_mode((const char *)&msg->l3h[line_start + 3],
- &endp->conn_mode) != 0) {
- error_code = 517;
- goto error3;
- }
- endp->orig_mode = endp->conn_mode;
- break;
- case 'Z':
- silent = strcmp("noanswer", (const char *)&msg->l3h[line_start + 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;
- const char *param = (const char *)&msg->l3h[line_start];
-
- if (sscanf(param, "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];
- const char *param = (const char *)&msg->l3h[line_start];
-
- if (sscanf(param, "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",
- msg->l3h[line_start], msg->l3h[line_start],
- ENDPOINT_NUMBER(endp));
- break;
- }
- MSG_TOKENIZE_END
-
- /* policy CB */
- if (cfg->policy_cb) {
- switch (cfg->policy_cb(endp->tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_MDCX, trans_id)) {
- 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(400, "MDCX", trans_id);
- 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 (cfg->change_cb)
- cfg->change_cb(endp->tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_MDCX);
- if (silent)
- goto out_silent;
-
- return create_response_with_sdp(endp, "MDCX", trans_id);
-
-error:
- LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d %d\n",
- hexdump(msg->l3h, msgb_l3len(msg)),
- ENDPOINT_NUMBER(endp), line_start, i, msg->l3h[line_start]);
- return create_err_response(error_code, "MDCX", trans_id);
-
-error3:
- return create_err_response(error_code, "MDCX", trans_id);
-
-
-out_silent:
- return NULL;
-}
-
-static struct msgb *handle_delete_con(struct mgcp_config *cfg, struct msgb *msg)
-{
- struct mgcp_msg_ptr data_ptrs[6];
- int found, i, line_start;
- const char *trans_id;
- struct mgcp_endpoint *endp;
- int error_code = 400;
- int silent = 0;
-
- found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
- if (found != 0)
- return create_err_response(error_code, "DLCX", trans_id);
-
- if (!endp->allocated) {
- LOGP(DMGCP, LOGL_ERROR, "Endpoint is not used. 0x%x\n", ENDPOINT_NUMBER(endp));
- return create_err_response(400, "DLCX", trans_id);
- }
-
- MSG_TOKENIZE_START
- switch (msg->l3h[line_start]) {
- case 'C': {
- if (verify_call_id(endp, (const char *)&msg->l3h[line_start + 3]) != 0)
- goto error3;
- break;
- }
- case 'I': {
- if (verify_ci(endp, (const char *)&msg->l3h[line_start + 3]) != 0)
- goto error3;
- break;
- case 'Z':
- silent = strcmp("noanswer", (const char *)&msg->l3h[line_start + 3]) == 0;
- break;
- }
- default:
- LOGP(DMGCP, LOGL_NOTICE, "Unhandled option: '%c'/%d on 0x%x\n",
- msg->l3h[line_start], msg->l3h[line_start],
- ENDPOINT_NUMBER(endp));
- break;
- }
- MSG_TOKENIZE_END
-
- /* policy CB */
- if (cfg->policy_cb) {
- switch (cfg->policy_cb(endp->tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_DLCX, trans_id)) {
- 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(400, "DLCX", trans_id);
- 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));
-
- delete_transcoder(endp);
- mgcp_free_endp(endp);
- if (cfg->change_cb)
- cfg->change_cb(endp->tcfg, ENDPOINT_NUMBER(endp), MGCP_ENDP_DLCX);
-
- if (silent)
- goto out_silent;
- return create_ok_response(250, "DLCX", trans_id);
-
-error:
- LOGP(DMGCP, LOGL_ERROR, "Malformed line: %s on 0x%x with: line_start: %d %d\n",
- hexdump(msg->l3h, msgb_l3len(msg)),
- ENDPOINT_NUMBER(endp), line_start, i);
- return create_err_response(error_code, "DLCX", trans_id);
-
-error3:
- return create_err_response(error_code, "DLCX", trans_id);
-
-out_silent:
- return NULL;
-}
-
-static struct msgb *handle_rsip(struct mgcp_config *cfg, struct msgb *msg)
-{
- if (cfg->reset_cb)
- cfg->reset_cb(cfg);
- return NULL;
-}
-
-/*
- * 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_config *cfg, struct msgb *msg)
-{
- struct mgcp_msg_ptr data_ptrs[6];
- const char *trans_id;
- struct mgcp_endpoint *endp;
- int found;
-
- found = mgcp_analyze_header(cfg, msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
- if (found != 0)
- return create_err_response(400, "RQNT", trans_id);
-
- if (!endp->allocated) {
- LOGP(DMGCP, LOGL_ERROR, "Endpoint is not used. 0x%x\n", ENDPOINT_NUMBER(endp));
- return create_err_response(400, "RQNT", trans_id);
- }
- return create_ok_response(200, "RQNT", trans_id);
-}
-
-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;
-
- 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;
- 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;
- memset(&end->addr, 0, sizeof(end->addr));
- end->rtp_port = end->rtcp_port = 0;
- end->payload_type = -1;
- end->local_alloc = -1;
-}
-
-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;
-
- if (endp->callid) {
- talloc_free(endp->callid);
- endp->callid = NULL;
- }
-
- if (endp->local_options) {
- 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->is_transcoded = 0;
-
- 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 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->is_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->is_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);
-}