1237 lines
35 KiB
C
1237 lines
35 KiB
C
/* mgcp_utils - common functions to setup an MGCP connection
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*/
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/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/write_queue.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/byteswap.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/mgcp_client/mgcp_client.h>
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#include <osmocom/mgcp_client/mgcp_client_internal.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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/* Codec descripton for dynamic payload types (SDP) */
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static const struct value_string codec_table[] = {
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{ CODEC_PCMU_8000_1, "PCMU/8000/1" },
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{ CODEC_GSM_8000_1, "GSM/8000/1" },
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{ CODEC_PCMA_8000_1, "PCMA/8000/1" },
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{ CODEC_G729_8000_1, "G729/8000/1" },
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{ CODEC_GSMEFR_8000_1, "GSM-EFR/8000/1" },
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{ CODEC_GSMHR_8000_1, "GSM-HR-08/8000/1" },
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{ CODEC_AMR_8000_1, "AMR/8000/1" },
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{ CODEC_AMRWB_16000_1, "AMR-WB/16000/1" },
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{ 0, NULL },
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};
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/* Get encoding name from a full codec string e,g.
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* ("CODEC/8000/2" => returns "CODEC") */
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static char *extract_codec_name(const char *str)
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{
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static char buf[64];
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unsigned int i;
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if (!str)
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return NULL;
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/* FIXME osmo_strlcpy */
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osmo_strlcpy(buf, str, sizeof(buf));
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for (i = 0; i < strlen(buf); i++) {
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if (buf[i] == '/')
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buf[i] = '\0';
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}
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return buf;
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}
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/*! Map a string to a codec.
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* \ptmap[in] str input string (e.g "GSM/8000/1", "GSM/8000" or "GSM")
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* \returns codec that corresponds to the given string representation. */
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enum mgcp_codecs map_str_to_codec(const char *str)
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{
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unsigned int i;
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char *codec_name;
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char str_buf[64];
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osmo_strlcpy(str_buf, extract_codec_name(str), sizeof(str_buf));
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for (i = 0; i < ARRAY_SIZE(codec_table); i++) {
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codec_name = extract_codec_name(codec_table[i].str);
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if (!codec_name)
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continue;
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if (strcmp(codec_name, str_buf) == 0)
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return codec_table[i].value;
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}
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return -1;
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}
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/* Check the ptmap for illegal mappings */
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static int check_ptmap(struct ptmap *ptmap)
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{
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/* Check if there are mappings that leave the IANA assigned dynamic
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* payload type range. Under normal conditions such mappings should
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* not occur */
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/* Its ok to have a 1:1 mapping in the statically defined
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* range, this won't hurt */
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if (ptmap->codec == ptmap->pt)
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return 0;
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if (ptmap->codec < 96 || ptmap->codec > 127)
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goto error;
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if (ptmap->pt < 96 || ptmap->pt > 127)
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goto error;
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return 0;
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error:
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LOGP(DLMGCP, LOGL_ERROR,
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"ptmap contains illegal mapping: codec=%u maps to pt=%u\n",
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ptmap->codec, ptmap->pt);
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return -1;
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}
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/*! Map a codec to a payload type.
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* \ptmap[in] payload pointer to payload type map with specified payload types.
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* \ptmap[in] ptmap_len length of the payload type map.
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* \ptmap[in] codec the codec for which the payload type should be looked up.
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* \returns assigned payload type */
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unsigned int map_codec_to_pt(struct ptmap *ptmap, unsigned int ptmap_len,
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enum mgcp_codecs codec)
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{
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unsigned int i;
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/*! Note: If the payload type map is empty or the codec is not found
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* in the map, then a 1:1 mapping is performed. If the codec falls
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* into the statically defined range or if the mapping table isself
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* tries to map to the statically defined range, then the mapping
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* is also ignored and a 1:1 mapping is performed instead. */
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/* we may return the codec directly since enum mgcp_codecs directly
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* corresponds to the statićally assigned payload types */
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if (codec < 96 || codec > 127)
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return codec;
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for (i = 0; i < ptmap_len; i++) {
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/* Skip illegal map entries */
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if (check_ptmap(ptmap) == 0 && ptmap->codec == codec)
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return ptmap->pt;
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ptmap++;
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}
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/* If nothing is found, do not perform any mapping */
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return codec;
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}
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/*! Map a payload type to a codec.
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* \ptmap[in] payload pointer to payload type map with specified payload types.
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* \ptmap[in] ptmap_len length of the payload type map.
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* \ptmap[in] payload type for which the codec should be looked up.
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* \returns codec that corresponds to the specified payload type */
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enum mgcp_codecs map_pt_to_codec(struct ptmap *ptmap, unsigned int ptmap_len,
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unsigned int pt)
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{
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unsigned int i;
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/*! Note: If the payload type map is empty or the payload type is not
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* found in the map, then a 1:1 mapping is performed. If the payload
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* type falls into the statically defined range or if the mapping
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* table isself tries to map to the statically defined range, then
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* the mapping is also ignored and a 1:1 mapping is performed
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* instead. */
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/* See also note in map_codec_to_pt() */
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if (pt < 96 || pt > 127)
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return pt;
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for (i = 0; i < ptmap_len; i++) {
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if (check_ptmap(ptmap) == 0 && ptmap->pt == pt)
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return ptmap->codec;
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ptmap++;
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}
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/* If nothing is found, do not perform any mapping */
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return pt;
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}
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/*! Initalize MGCP client configuration struct with default values.
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* \param[out] conf Client configuration.*/
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void mgcp_client_conf_init(struct mgcp_client_conf *conf)
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{
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/* NULL and -1 default to MGCP_CLIENT_*_DEFAULT values */
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*conf = (struct mgcp_client_conf){
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.local_addr = NULL,
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.local_port = -1,
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.remote_addr = NULL,
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.remote_port = -1,
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};
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}
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static void mgcp_client_handle_response(struct mgcp_client *mgcp,
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struct mgcp_response_pending *pending,
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struct mgcp_response *response)
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{
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if (!pending) {
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LOGP(DLMGCP, LOGL_ERROR,
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"Cannot handle NULL response\n");
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return;
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}
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if (pending->response_cb)
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pending->response_cb(response, pending->priv);
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else
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LOGP(DLMGCP, LOGL_DEBUG, "MGCP response ignored (NULL cb)\n");
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talloc_free(pending);
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}
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static int mgcp_response_parse_head(struct mgcp_response *r, struct msgb *msg)
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{
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int comment_pos;
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char *end;
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if (mgcp_msg_terminate_nul(msg))
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goto response_parse_failure;
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r->body = (char *)msg->data;
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if (sscanf(r->body, "%3d %u %n",
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&r->head.response_code, &r->head.trans_id,
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&comment_pos) != 2)
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goto response_parse_failure;
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osmo_strlcpy(r->head.comment, r->body + comment_pos, sizeof(r->head.comment));
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end = strchr(r->head.comment, '\r');
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if (!end)
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goto response_parse_failure;
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/* Mark the end of the comment */
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*end = '\0';
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return 0;
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response_parse_failure:
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LOGP(DLMGCP, LOGL_ERROR,
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"Failed to parse MGCP response header\n");
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return -EINVAL;
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}
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/* TODO undup against mgcp_protocol.c:mgcp_check_param() */
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static bool mgcp_line_is_valid(const char *line)
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{
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const size_t line_len = strlen(line);
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if (line[0] == '\0')
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return true;
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if (line_len < 2
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|| line[1] != '=') {
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LOGP(DLMGCP, LOGL_ERROR,
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"Wrong MGCP option format: '%s'\n",
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line);
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return false;
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}
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return true;
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}
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/* Parse a line like "m=audio 16002 RTP/AVP 98", extract port and payload types */
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static int mgcp_parse_audio_port_pt(struct mgcp_response *r, char *line)
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{
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char *pt_str;
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unsigned int pt;
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unsigned int count = 0;
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unsigned int i;
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/* Extract port information */
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if (sscanf(line, "m=audio %hu", &r->audio_port) != 1)
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goto response_parse_failure_port;
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if (r->audio_port == 0)
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goto response_parse_failure_port;
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/* Extract payload types */
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line = strstr(line, "RTP/AVP ");
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if (!line)
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goto exit;
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pt_str = strtok(line, " ");
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while (1) {
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/* Do not allow excessive payload types */
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if (count > ARRAY_SIZE(r->codecs))
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goto response_parse_failure_pt;
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pt_str = strtok(NULL, " ");
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if (!pt_str)
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break;
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pt = atoi(pt_str);
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/* Do not allow duplicate payload types */
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for (i = 0; i < count; i++)
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if (r->codecs[i] == pt)
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goto response_parse_failure_pt;
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/* Note: The payload type we store may not necessarly match
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* the codec types we have defined in enum mgcp_codecs. To
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* ensure that the end result only contains codec types which
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* match enum mgcp_codecs, we will go through afterwards and
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* remap the affected entries with the inrofmation we learn
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* from rtpmap */
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r->codecs[count] = pt;
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count++;
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}
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r->codecs_len = count;
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exit:
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return 0;
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response_parse_failure_port:
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LOGP(DLMGCP, LOGL_ERROR,
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"Failed to parse SDP parameter port (%s)\n", line);
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return -EINVAL;
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response_parse_failure_pt:
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LOGP(DLMGCP, LOGL_ERROR,
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"Failed to parse SDP parameter payload types (%s)\n", line);
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return -EINVAL;
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}
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/* Parse a line like "m=audio 16002 RTP/AVP 98", extract port and payload types */
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static int mgcp_parse_audio_ptime_rtpmap(struct mgcp_response *r, const char *line)
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{
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unsigned int pt;
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char codec_resp[64];
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unsigned int codec;
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if (strstr(line, "ptime")) {
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if (sscanf(line, "a=ptime:%u", &r->ptime) != 1)
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goto response_parse_failure_ptime;
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} else if (strstr(line, "rtpmap")) {
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if (sscanf(line, "a=rtpmap:%d %63s", &pt, codec_resp) == 2) {
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/* The MGW may assign an own payload type in the
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* response if the choosen codec falls into the IANA
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* assigned dynamic payload type range (96-127).
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* Normally the MGW should obey the 3gpp payload type
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* assignments, which are fixed, so we likely wont see
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* anything unexpected here. In order to be sure that
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* we will now check the codec string and if the result
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* does not match to what is IANA / 3gpp assigned, we
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* will create an entry in the ptmap table so we can
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* lookup later what has been assigned. */
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codec = map_str_to_codec(codec_resp);
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if (codec != pt) {
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if (r->ptmap_len < ARRAY_SIZE(r->ptmap)) {
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r->ptmap[r->ptmap_len].pt = pt;
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r->ptmap[r->ptmap_len].codec = codec;
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r->ptmap_len++;
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} else
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goto response_parse_failure_rtpmap;
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}
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} else
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goto response_parse_failure_rtpmap;
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}
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return 0;
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response_parse_failure_ptime:
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LOGP(DLMGCP, LOGL_ERROR,
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"Failed to parse SDP parameter, invalid ptime (%s)\n", line);
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return -EINVAL;
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response_parse_failure_rtpmap:
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LOGP(DLMGCP, LOGL_ERROR,
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"Failed to parse SDP parameter, invalid rtpmap (%s)\n", line);
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return -EINVAL;
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}
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|
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/* Parse a line like "c=IN IP4 10.11.12.13" */
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static int mgcp_parse_audio_ip(struct mgcp_response *r, const char *line)
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{
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struct in_addr ip_test;
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if (strlen(line) < 16)
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goto response_parse_failure;
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/* The current implementation strictly supports IPV4 only ! */
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if (memcmp("c=IN IP4 ", line, 9) != 0)
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goto response_parse_failure;
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/* Extract IP-Address */
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osmo_strlcpy(r->audio_ip, line + 9, sizeof(r->audio_ip));
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|
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/* Check IP-Address */
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if (inet_aton(r->audio_ip, &ip_test) == 0)
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goto response_parse_failure;
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return 0;
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|
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response_parse_failure:
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LOGP(DLMGCP, LOGL_ERROR,
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"Failed to parse MGCP response header (audio ip)\n");
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return -EINVAL;
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}
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|
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/* A new section is marked by a double line break, check a few more
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* patterns as there may be variants */
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static char *mgcp_find_section_end(char *string)
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{
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char *rc;
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rc = strstr(string, "\n\n");
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if (rc)
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return rc;
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|
|
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rc = strstr(string, "\n\r\n\r");
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if (rc)
|
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return rc;
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|
|
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rc = strstr(string, "\r\n\r\n");
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if (rc)
|
|
return rc;
|
|
|
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return NULL;
|
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}
|
|
|
|
/*! Parse body (SDP) parameters of the MGCP response
|
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* \param[in,out] r Response data
|
|
* \returns 0 on success, -EINVAL on error. */
|
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int mgcp_response_parse_params(struct mgcp_response *r)
|
|
{
|
|
char *line;
|
|
int rc;
|
|
char *data;
|
|
char *data_ptr;
|
|
int i;
|
|
|
|
/* Since this functions performs a destructive parsing, we create a
|
|
* local copy of the body data */
|
|
OSMO_ASSERT(r->body);
|
|
data = talloc_strdup(r, r->body);
|
|
OSMO_ASSERT(data);
|
|
|
|
/* Find beginning of the parameter (SDP) section */
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|
data_ptr = mgcp_find_section_end(data);
|
|
if (!data_ptr) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"MGCP response: cannot find start of SDP parameters\n");
|
|
rc = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
/* data_ptr now points to the beginning of the section-end-marker; for_each_non_empty_line()
|
|
* skips any \r and \n characters for free, so we don't need to skip the marker. */
|
|
|
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for_each_non_empty_line(line, data_ptr) {
|
|
if (!mgcp_line_is_valid(line))
|
|
return -EINVAL;
|
|
|
|
switch (line[0]) {
|
|
case 'a':
|
|
rc = mgcp_parse_audio_ptime_rtpmap(r, line);
|
|
if (rc)
|
|
goto exit;
|
|
break;
|
|
case 'm':
|
|
rc = mgcp_parse_audio_port_pt(r, line);
|
|
if (rc)
|
|
goto exit;
|
|
break;
|
|
case 'c':
|
|
rc = mgcp_parse_audio_ip(r, line);
|
|
if (rc)
|
|
goto exit;
|
|
break;
|
|
default:
|
|
/* skip unhandled parameters */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* See also note in mgcp_parse_audio_port_pt() */
|
|
for (i = 0; i < r->codecs_len; i++)
|
|
r->codecs[i] = map_pt_to_codec(r->ptmap, r->ptmap_len, r->codecs[i]);
|
|
|
|
rc = 0;
|
|
exit:
|
|
talloc_free(data);
|
|
return rc;
|
|
}
|
|
|
|
/* Parse a line like "X: something" */
|
|
static int mgcp_parse_head_param(char *result, unsigned int result_len,
|
|
char label, const char *line)
|
|
{
|
|
char label_string[4];
|
|
size_t rc;
|
|
|
|
/* Detect empty parameters */
|
|
if (strlen(line) < 4)
|
|
goto response_parse_failure;
|
|
|
|
/* Check if the label matches */
|
|
snprintf(label_string, sizeof(label_string), "%c: ", label);
|
|
if (memcmp(label_string, line, 3) != 0)
|
|
goto response_parse_failure;
|
|
|
|
/* Copy payload part of the string to destinations (the label string
|
|
* is always 3 chars long) */
|
|
rc = osmo_strlcpy(result, line + 3, result_len);
|
|
if (rc >= result_len) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Failed to parse MGCP response (parameter label: %c):"
|
|
" the received conn ID is too long: %zu, maximum is %u characters\n",
|
|
label, rc, result_len - 1);
|
|
return -ENOSPC;
|
|
}
|
|
return 0;
|
|
|
|
response_parse_failure:
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Failed to parse MGCP response (parameter label: %c)\n", label);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Parse MGCP parameters of the response */
|
|
static int parse_head_params(struct mgcp_response *r)
|
|
{
|
|
char *line;
|
|
int rc = 0;
|
|
OSMO_ASSERT(r->body);
|
|
char *data;
|
|
char *data_ptr;
|
|
char *data_end;
|
|
|
|
/* Since this functions performs a destructive parsing, we create a
|
|
* local copy of the body data */
|
|
data = talloc_zero_size(r, strlen(r->body)+1);
|
|
OSMO_ASSERT(data);
|
|
data_ptr = data;
|
|
osmo_strlcpy(data, r->body, strlen(r->body));
|
|
|
|
/* If there is an SDP body attached, prevent for_each_non_empty_line()
|
|
* into running in there, we are not yet interested in the parameters
|
|
* stored there. */
|
|
data_end = mgcp_find_section_end(data);
|
|
if (data_end)
|
|
*data_end = '\0';
|
|
|
|
for_each_non_empty_line(line, data_ptr) {
|
|
switch (line[0]) {
|
|
case 'Z':
|
|
rc = mgcp_parse_head_param(r->head.endpoint,
|
|
sizeof(r->head.endpoint),
|
|
'Z', line);
|
|
if (rc)
|
|
goto exit;
|
|
|
|
/* A specific endpoint identifier returned by the MGW
|
|
* must not contain any wildcard characters */
|
|
if (strstr(r->head.endpoint, "*") != NULL) {
|
|
rc = -EINVAL;
|
|
goto exit;
|
|
}
|
|
|
|
/* A specific endpoint identifier returned by the MGW
|
|
* must contain an @ character */
|
|
if (strstr(r->head.endpoint, "@") == NULL) {
|
|
rc = -EINVAL;
|
|
goto exit;
|
|
}
|
|
break;
|
|
case 'I':
|
|
rc = mgcp_parse_head_param(r->head.conn_id,
|
|
sizeof(r->head.conn_id),
|
|
'I', line);
|
|
if (rc)
|
|
goto exit;
|
|
break;
|
|
default:
|
|
/* skip unhandled parameters */
|
|
break;
|
|
}
|
|
}
|
|
exit:
|
|
talloc_free(data);
|
|
return rc;
|
|
}
|
|
|
|
static struct mgcp_response_pending *mgcp_client_response_pending_get(
|
|
struct mgcp_client *mgcp,
|
|
mgcp_trans_id_t trans_id)
|
|
{
|
|
struct mgcp_response_pending *pending;
|
|
llist_for_each_entry(pending, &mgcp->responses_pending, entry) {
|
|
if (pending->trans_id == trans_id) {
|
|
llist_del(&pending->entry);
|
|
return pending;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* Feed an MGCP message into the receive processing.
|
|
* Parse the head and call any callback registered for the transaction id found
|
|
* in the MGCP message. This is normally called directly from the internal
|
|
* mgcp_do_read that reads from the socket connected to the MGCP gateway. This
|
|
* function is published mainly to be able to feed data from the test suite.
|
|
*/
|
|
int mgcp_client_rx(struct mgcp_client *mgcp, struct msgb *msg)
|
|
{
|
|
struct mgcp_response *r;
|
|
struct mgcp_response_pending *pending;
|
|
int rc;
|
|
|
|
r = talloc_zero(mgcp, struct mgcp_response);
|
|
OSMO_ASSERT(r);
|
|
|
|
rc = mgcp_response_parse_head(r, msg);
|
|
if (rc) {
|
|
LOGP(DLMGCP, LOGL_ERROR, "Cannot parse MGCP response (head)\n");
|
|
rc = 1;
|
|
goto error;
|
|
}
|
|
|
|
rc = parse_head_params(r);
|
|
if (rc) {
|
|
LOGP(DLMGCP, LOGL_ERROR, "Cannot parse MGCP response (head parameters)\n");
|
|
rc = 1;
|
|
goto error;
|
|
}
|
|
|
|
pending = mgcp_client_response_pending_get(mgcp, r->head.trans_id);
|
|
if (!pending) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Cannot find matching MGCP transaction for trans_id %d\n",
|
|
r->head.trans_id);
|
|
rc = -ENOENT;
|
|
goto error;
|
|
}
|
|
|
|
mgcp_client_handle_response(mgcp, pending, r);
|
|
rc = 0;
|
|
|
|
error:
|
|
talloc_free(r);
|
|
return rc;
|
|
}
|
|
|
|
static int mgcp_do_read(struct osmo_fd *fd)
|
|
{
|
|
struct mgcp_client *mgcp = fd->data;
|
|
struct msgb *msg;
|
|
int ret;
|
|
|
|
msg = msgb_alloc_headroom(4096, 128, "mgcp_from_gw");
|
|
if (!msg) {
|
|
LOGP(DLMGCP, LOGL_ERROR, "Failed to allocate MGCP message.\n");
|
|
return -1;
|
|
}
|
|
|
|
ret = read(fd->fd, msg->data, 4096 - 128);
|
|
if (ret <= 0) {
|
|
LOGP(DLMGCP, LOGL_ERROR, "Failed to read: %s: %d='%s'\n", osmo_sock_get_name2(fd->fd),
|
|
errno, strerror(errno));
|
|
|
|
msgb_free(msg);
|
|
return -1;
|
|
} else if (ret > 4096 - 128) {
|
|
LOGP(DLMGCP, LOGL_ERROR, "Too much data: %s: %d\n", osmo_sock_get_name2(fd->fd), ret);
|
|
msgb_free(msg);
|
|
return -1;
|
|
}
|
|
|
|
msg->l2h = msgb_put(msg, ret);
|
|
ret = mgcp_client_rx(mgcp, msg);
|
|
talloc_free(msg);
|
|
return ret;
|
|
}
|
|
|
|
static int mgcp_do_write(struct osmo_fd *fd, struct msgb *msg)
|
|
{
|
|
int ret;
|
|
|
|
LOGP(DLMGCP, LOGL_DEBUG, "Tx MGCP: %s: len=%u '%s'...\n",
|
|
osmo_sock_get_name2(fd->fd), msg->len, osmo_escape_str((const char*)msg->data, OSMO_MIN(42, msg->len)));
|
|
|
|
ret = write(fd->fd, msg->data, msg->len);
|
|
if (ret != msg->len)
|
|
LOGP(DLMGCP, LOGL_ERROR, "Failed to Tx MGCP: %s: %d='%s'; msg: len=%u '%s'...\n",
|
|
osmo_sock_get_name2(fd->fd), errno, strerror(errno),
|
|
msg->len, osmo_escape_str((const char*)msg->data, OSMO_MIN(42, msg->len)));
|
|
return ret;
|
|
}
|
|
|
|
struct mgcp_client *mgcp_client_init(void *ctx,
|
|
struct mgcp_client_conf *conf)
|
|
{
|
|
struct mgcp_client *mgcp;
|
|
|
|
mgcp = talloc_zero(ctx, struct mgcp_client);
|
|
|
|
INIT_LLIST_HEAD(&mgcp->responses_pending);
|
|
INIT_LLIST_HEAD(&mgcp->inuse_endpoints);
|
|
|
|
mgcp->next_trans_id = 1;
|
|
|
|
mgcp->actual.local_addr = conf->local_addr ? conf->local_addr :
|
|
MGCP_CLIENT_LOCAL_ADDR_DEFAULT;
|
|
mgcp->actual.local_port = conf->local_port >= 0 ? (uint16_t)conf->local_port :
|
|
MGCP_CLIENT_LOCAL_PORT_DEFAULT;
|
|
|
|
mgcp->actual.remote_addr = conf->remote_addr ? conf->remote_addr :
|
|
MGCP_CLIENT_REMOTE_ADDR_DEFAULT;
|
|
mgcp->actual.remote_port = conf->remote_port >= 0 ? (uint16_t)conf->remote_port :
|
|
MGCP_CLIENT_REMOTE_PORT_DEFAULT;
|
|
|
|
if (osmo_strlcpy(mgcp->actual.endpoint_domain_name, conf->endpoint_domain_name,
|
|
sizeof(mgcp->actual.endpoint_domain_name))
|
|
>= sizeof(mgcp->actual.endpoint_domain_name)) {
|
|
LOGP(DLMGCP, LOGL_ERROR, "MGCP client: endpoint domain name is too long, max length is %zu: '%s'\n",
|
|
sizeof(mgcp->actual.endpoint_domain_name) - 1, conf->endpoint_domain_name);
|
|
talloc_free(mgcp);
|
|
return NULL;
|
|
}
|
|
LOGP(DLMGCP, LOGL_NOTICE, "MGCP client: using endpoint domain '@%s'\n", mgcp_client_endpoint_domain(mgcp));
|
|
|
|
return mgcp;
|
|
}
|
|
|
|
static int init_socket(struct mgcp_client *mgcp)
|
|
{
|
|
int rc;
|
|
struct osmo_wqueue *wq;
|
|
int i;
|
|
|
|
wq = &mgcp->wq;
|
|
|
|
for (i = 0; i < 100; i++) {
|
|
|
|
/* Initalize socket with the currently configured port
|
|
* number */
|
|
rc = osmo_sock_init2_ofd(&wq->bfd, AF_INET, SOCK_DGRAM, IPPROTO_UDP, mgcp->actual.local_addr,
|
|
mgcp->actual.local_port, mgcp->actual.remote_addr, mgcp->actual.remote_port,
|
|
OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT);
|
|
if (rc > 0)
|
|
return rc;
|
|
|
|
/* If there is a different port than the default port
|
|
* configured then we assume that the user has choosen
|
|
* that port conciously and we will not try to resolve
|
|
* this by silently choosing a different port. */
|
|
if (mgcp->actual.local_port != MGCP_CLIENT_LOCAL_PORT_DEFAULT && i == 0)
|
|
return -EINVAL;
|
|
|
|
/* Choose a new port number to try next */
|
|
LOGP(DLMGCP, LOGL_NOTICE,
|
|
"MGCPGW failed to bind to %s:%u, retrying with port %u\n",
|
|
mgcp->actual.local_addr, mgcp->actual.local_port, mgcp->actual.local_port + 1);
|
|
mgcp->actual.local_port++;
|
|
}
|
|
|
|
LOGP(DLMGCP, LOGL_FATAL, "MGCPGW failed to find a port to bind on %i times.\n", i);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*! Initalize client connection (opens socket only, no request is sent yet)
|
|
* \param[in,out] mgcp MGCP client descriptor.
|
|
* \returns 0 on success, -EINVAL on error. */
|
|
int mgcp_client_connect(struct mgcp_client *mgcp)
|
|
{
|
|
struct sockaddr_in addr;
|
|
struct osmo_wqueue *wq;
|
|
int rc;
|
|
|
|
if (!mgcp) {
|
|
LOGP(DLMGCP, LOGL_FATAL, "MGCPGW client not initialized properly\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
wq = &mgcp->wq;
|
|
|
|
rc = init_socket(mgcp);
|
|
if (rc < 0) {
|
|
LOGP(DLMGCP, LOGL_FATAL,
|
|
"Failed to initialize socket %s:%u -> %s:%u for MGCP GW: %s\n",
|
|
mgcp->actual.local_addr, mgcp->actual.local_port,
|
|
mgcp->actual.remote_addr, mgcp->actual.remote_port, strerror(errno));
|
|
goto error_close_fd;
|
|
}
|
|
|
|
inet_aton(mgcp->actual.remote_addr, &addr.sin_addr);
|
|
mgcp->remote_addr = htonl(addr.sin_addr.s_addr);
|
|
|
|
osmo_wqueue_init(wq, 10);
|
|
wq->bfd.when = BSC_FD_READ;
|
|
wq->bfd.data = mgcp;
|
|
wq->read_cb = mgcp_do_read;
|
|
wq->write_cb = mgcp_do_write;
|
|
|
|
LOGP(DLMGCP, LOGL_INFO, "MGCP GW connection: %s\n", osmo_sock_get_name2(wq->bfd.fd));
|
|
|
|
return 0;
|
|
error_close_fd:
|
|
close(wq->bfd.fd);
|
|
wq->bfd.fd = -1;
|
|
return rc;
|
|
}
|
|
|
|
/*! Get the IP-Aaddress of the associated MGW as string.
|
|
* \param[in] mgcp MGCP client descriptor.
|
|
* \returns a pointer to the address string. */
|
|
const char *mgcp_client_remote_addr_str(struct mgcp_client *mgcp)
|
|
{
|
|
return mgcp->actual.remote_addr;
|
|
}
|
|
|
|
/*! Get the IP-Port of the associated MGW.
|
|
* \param[in] mgcp MGCP client descriptor.
|
|
* \returns port number. */
|
|
uint16_t mgcp_client_remote_port(struct mgcp_client *mgcp)
|
|
{
|
|
return mgcp->actual.remote_port;
|
|
}
|
|
|
|
/*! Get the IP-Aaddress of the associated MGW as its numeric representation.
|
|
* \param[in] mgcp MGCP client descriptor.
|
|
* \returns IP-Address as 32 bit integer (network byte order) */
|
|
uint32_t mgcp_client_remote_addr_n(struct mgcp_client *mgcp)
|
|
{
|
|
return mgcp->remote_addr;
|
|
}
|
|
|
|
/* To compose endpoint names, usually for CRCX, use this as domain name.
|
|
* For example, snprintf("rtpbridge\*@%s", mgcp_client_endpoint_domain(mgcp)). */
|
|
const char *mgcp_client_endpoint_domain(const struct mgcp_client *mgcp)
|
|
{
|
|
return mgcp->actual.endpoint_domain_name[0] ? mgcp->actual.endpoint_domain_name : "mgw";
|
|
}
|
|
|
|
const char *mgcp_client_rtpbridge_wildcard(const struct mgcp_client *mgcp)
|
|
{
|
|
static char endpoint[MGCP_ENDPOINT_MAXLEN];
|
|
int rc;
|
|
|
|
#define RTPBRIDGE_WILDCARD_FMT "rtpbridge/*@%s"
|
|
rc = snprintf(endpoint, sizeof(endpoint), RTPBRIDGE_WILDCARD_FMT, mgcp_client_endpoint_domain(mgcp));
|
|
if (rc > sizeof(endpoint) - 1) {
|
|
LOGP(DLMGCP, LOGL_ERROR, "MGCP endpoint exceeds maximum length of %zu: '" RTPBRIDGE_WILDCARD_FMT "'\n",
|
|
sizeof(endpoint) - 1, mgcp_client_endpoint_domain(mgcp));
|
|
return NULL;
|
|
}
|
|
if (rc < 1) {
|
|
LOGP(DLMGCP, LOGL_ERROR, "Cannot compose MGCP endpoint name\n");
|
|
return NULL;
|
|
}
|
|
return endpoint;
|
|
}
|
|
|
|
struct mgcp_response_pending * mgcp_client_pending_add(
|
|
struct mgcp_client *mgcp,
|
|
mgcp_trans_id_t trans_id,
|
|
mgcp_response_cb_t response_cb,
|
|
void *priv)
|
|
{
|
|
struct mgcp_response_pending *pending;
|
|
|
|
pending = talloc_zero(mgcp, struct mgcp_response_pending);
|
|
pending->trans_id = trans_id;
|
|
pending->response_cb = response_cb;
|
|
pending->priv = priv;
|
|
llist_add_tail(&pending->entry, &mgcp->responses_pending);
|
|
|
|
return pending;
|
|
}
|
|
|
|
/* Send the MGCP message in msg to the MGCP GW and handle a response with
|
|
* response_cb. NOTE: the response_cb still needs to call
|
|
* mgcp_response_parse_params(response) to get the parsed parameters -- to
|
|
* potentially save some CPU cycles, only the head line has been parsed when
|
|
* the response_cb is invoked.
|
|
* Before the priv pointer becomes invalid, e.g. due to transaction timeout,
|
|
* mgcp_client_cancel() needs to be called for this transaction.
|
|
*/
|
|
int mgcp_client_tx(struct mgcp_client *mgcp, struct msgb *msg,
|
|
mgcp_response_cb_t response_cb, void *priv)
|
|
{
|
|
struct mgcp_response_pending *pending;
|
|
mgcp_trans_id_t trans_id;
|
|
int rc;
|
|
|
|
trans_id = msg->cb[MSGB_CB_MGCP_TRANS_ID];
|
|
if (!trans_id) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Unset transaction id in mgcp send request\n");
|
|
talloc_free(msg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pending = mgcp_client_pending_add(mgcp, trans_id, response_cb, priv);
|
|
|
|
if (msgb_l2len(msg) > 4096) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Cannot send, MGCP message too large: %u\n",
|
|
msgb_l2len(msg));
|
|
msgb_free(msg);
|
|
rc = -EINVAL;
|
|
goto mgcp_tx_error;
|
|
}
|
|
|
|
rc = osmo_wqueue_enqueue(&mgcp->wq, msg);
|
|
if (rc) {
|
|
LOGP(DLMGCP, LOGL_FATAL, "Could not queue message to MGCP GW\n");
|
|
msgb_free(msg);
|
|
goto mgcp_tx_error;
|
|
} else
|
|
LOGP(DLMGCP, LOGL_DEBUG, "Queued %u bytes for MGCP GW\n",
|
|
msgb_l2len(msg));
|
|
return 0;
|
|
|
|
mgcp_tx_error:
|
|
/* Pass NULL to response cb to indicate an error */
|
|
mgcp_client_handle_response(mgcp, pending, NULL);
|
|
return -1;
|
|
}
|
|
|
|
/*! Cancel a pending transaction.
|
|
* \param[in] mgcp MGCP client descriptor.
|
|
* \param[in,out] trans_id Transaction id.
|
|
* \returns 0 on success, -ENOENT on error.
|
|
*
|
|
* Should a priv pointer passed to mgcp_client_tx() become invalid, this function must be called. In
|
|
* practical terms, if the caller of mgcp_client_tx() wishes to tear down a transaction without having
|
|
* received a response this function must be called. The trans_id can be obtained by calling
|
|
* mgcp_msg_trans_id() on the msgb produced by mgcp_msg_gen(). */
|
|
int mgcp_client_cancel(struct mgcp_client *mgcp, mgcp_trans_id_t trans_id)
|
|
{
|
|
struct mgcp_response_pending *pending = mgcp_client_response_pending_get(mgcp, trans_id);
|
|
if (!pending) {
|
|
/*! Note: it is not harmful to cancel a transaction twice. */
|
|
LOGP(DLMGCP, LOGL_ERROR, "Cannot cancel, no such transaction: %u\n", trans_id);
|
|
return -ENOENT;
|
|
}
|
|
LOGP(DLMGCP, LOGL_DEBUG, "Canceled transaction %u\n", trans_id);
|
|
talloc_free(pending);
|
|
return 0;
|
|
/*! We don't really need to clean up the wqueue: In all sane cases, the msgb has already been sent
|
|
* out and is no longer in the wqueue. If it still is in the wqueue, then sending MGCP messages
|
|
* per se is broken and the program should notice so by a full wqueue. Even if this was called
|
|
* before we had a chance to send out the message and it is still going to be sent, we will just
|
|
* ignore the reply to it later. Removing a msgb from the wqueue here would just introduce more
|
|
* bug surface in terms of failing to update wqueue API's counters or some such.
|
|
*/
|
|
}
|
|
|
|
static mgcp_trans_id_t mgcp_client_next_trans_id(struct mgcp_client *mgcp)
|
|
{
|
|
/* avoid zero trans_id to distinguish from unset trans_id */
|
|
if (!mgcp->next_trans_id)
|
|
mgcp->next_trans_id ++;
|
|
return mgcp->next_trans_id ++;
|
|
}
|
|
|
|
#define MGCP_CRCX_MANDATORY (MGCP_MSG_PRESENCE_ENDPOINT | \
|
|
MGCP_MSG_PRESENCE_CALL_ID | \
|
|
MGCP_MSG_PRESENCE_CONN_MODE)
|
|
#define MGCP_MDCX_MANDATORY (MGCP_MSG_PRESENCE_ENDPOINT | \
|
|
MGCP_MSG_PRESENCE_CALL_ID | \
|
|
MGCP_MSG_PRESENCE_CONN_ID)
|
|
#define MGCP_DLCX_MANDATORY (MGCP_MSG_PRESENCE_ENDPOINT)
|
|
#define MGCP_AUEP_MANDATORY (MGCP_MSG_PRESENCE_ENDPOINT)
|
|
#define MGCP_RSIP_MANDATORY 0 /* none */
|
|
|
|
/* Helper function for mgcp_msg_gen(): Add LCO information to MGCP message */
|
|
static int add_lco(struct msgb *msg, struct mgcp_msg *mgcp_msg)
|
|
{
|
|
unsigned int i;
|
|
int rc = 0;
|
|
const char *codec;
|
|
unsigned int pt;
|
|
|
|
rc += msgb_printf(msg, "L:");
|
|
|
|
if (mgcp_msg->ptime)
|
|
rc += msgb_printf(msg, " p:%u,", mgcp_msg->ptime);
|
|
|
|
if (mgcp_msg->codecs_len) {
|
|
rc += msgb_printf(msg, " a:");
|
|
for (i = 0; i < mgcp_msg->codecs_len; i++) {
|
|
pt = mgcp_msg->codecs[i];
|
|
codec = get_value_string_or_null(codec_table, pt);
|
|
|
|
/* Note: Use codec descriptors from enum mgcp_codecs
|
|
* in mgcp_client only! */
|
|
OSMO_ASSERT(codec);
|
|
rc += msgb_printf(msg, "%s", extract_codec_name(codec));
|
|
if (i < mgcp_msg->codecs_len - 1)
|
|
rc += msgb_printf(msg, ";");
|
|
}
|
|
rc += msgb_printf(msg, ",");
|
|
}
|
|
|
|
rc += msgb_printf(msg, " nt:IN\r\n");
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Helper function for mgcp_msg_gen(): Add SDP information to MGCP message */
|
|
static int add_sdp(struct msgb *msg, struct mgcp_msg *mgcp_msg, struct mgcp_client *mgcp)
|
|
{
|
|
unsigned int i;
|
|
int rc = 0;
|
|
char local_ip[INET_ADDRSTRLEN];
|
|
const char *codec;
|
|
unsigned int pt;
|
|
|
|
/* Add separator to mark the beginning of the SDP block */
|
|
rc += msgb_printf(msg, "\r\n");
|
|
|
|
/* Add SDP protocol version */
|
|
rc += msgb_printf(msg, "v=0\r\n");
|
|
|
|
/* Determine local IP-Address */
|
|
if (osmo_sock_local_ip(local_ip, mgcp->actual.remote_addr) < 0) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Could not determine local IP-Address!\n");
|
|
msgb_free(msg);
|
|
return -2;
|
|
}
|
|
|
|
/* Add owner/creator (SDP) */
|
|
rc += msgb_printf(msg, "o=- %x 23 IN IP4 %s\r\n",
|
|
mgcp_msg->call_id, local_ip);
|
|
|
|
/* Add session name (none) */
|
|
rc += msgb_printf(msg, "s=-\r\n");
|
|
|
|
/* Add RTP address and port */
|
|
if (mgcp_msg->audio_port == 0) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Invalid port number, can not generate MGCP message\n");
|
|
msgb_free(msg);
|
|
return -2;
|
|
}
|
|
if (strlen(mgcp_msg->audio_ip) <= 0) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Empty ip address, can not generate MGCP message\n");
|
|
msgb_free(msg);
|
|
return -2;
|
|
}
|
|
rc += msgb_printf(msg, "c=IN IP4 %s\r\n", mgcp_msg->audio_ip);
|
|
|
|
/* Add time description, active time (SDP) */
|
|
rc += msgb_printf(msg, "t=0 0\r\n");
|
|
|
|
rc += msgb_printf(msg, "m=audio %u RTP/AVP", mgcp_msg->audio_port);
|
|
for (i = 0; i < mgcp_msg->codecs_len; i++) {
|
|
pt = map_codec_to_pt(mgcp_msg->ptmap, mgcp_msg->ptmap_len, mgcp_msg->codecs[i]);
|
|
rc += msgb_printf(msg, " %u", pt);
|
|
|
|
}
|
|
rc += msgb_printf(msg, "\r\n");
|
|
|
|
for (i = 0; i < mgcp_msg->codecs_len; i++) {
|
|
pt = map_codec_to_pt(mgcp_msg->ptmap, mgcp_msg->ptmap_len, mgcp_msg->codecs[i]);
|
|
|
|
/* Note: Only dynamic payload type from the range 96-127
|
|
* require to be explained further via rtpmap. All others
|
|
* are implcitly definedby the number in m=audio */
|
|
if (pt >= 96 && pt <= 127) {
|
|
codec = get_value_string_or_null(codec_table, mgcp_msg->codecs[i]);
|
|
|
|
/* Note: Use codec descriptors from enum mgcp_codecs
|
|
* in mgcp_client only! */
|
|
OSMO_ASSERT(codec);
|
|
|
|
rc += msgb_printf(msg, "a=rtpmap:%u %s\r\n", pt, codec);
|
|
}
|
|
}
|
|
|
|
if (mgcp_msg->ptime)
|
|
rc += msgb_printf(msg, "a=ptime:%u\r\n", mgcp_msg->ptime);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*! Generate an MGCP message
|
|
* \param[in] mgcp MGCP client descriptor.
|
|
* \param[in] mgcp_msg Message description
|
|
* \returns message buffer on success, NULL on error. */
|
|
struct msgb *mgcp_msg_gen(struct mgcp_client *mgcp, struct mgcp_msg *mgcp_msg)
|
|
{
|
|
mgcp_trans_id_t trans_id = mgcp_client_next_trans_id(mgcp);
|
|
uint32_t mandatory_mask;
|
|
struct msgb *msg = msgb_alloc_headroom(4096, 128, "MGCP tx");
|
|
int rc = 0;
|
|
int rc_sdp;
|
|
bool use_sdp = false;
|
|
|
|
msg->l2h = msg->data;
|
|
msg->cb[MSGB_CB_MGCP_TRANS_ID] = trans_id;
|
|
|
|
/* Add command verb */
|
|
switch (mgcp_msg->verb) {
|
|
case MGCP_VERB_CRCX:
|
|
mandatory_mask = MGCP_CRCX_MANDATORY;
|
|
rc += msgb_printf(msg, "CRCX %u", trans_id);
|
|
break;
|
|
case MGCP_VERB_MDCX:
|
|
mandatory_mask = MGCP_MDCX_MANDATORY;
|
|
rc += msgb_printf(msg, "MDCX %u", trans_id);
|
|
break;
|
|
case MGCP_VERB_DLCX:
|
|
mandatory_mask = MGCP_DLCX_MANDATORY;
|
|
rc += msgb_printf(msg, "DLCX %u", trans_id);
|
|
break;
|
|
case MGCP_VERB_AUEP:
|
|
mandatory_mask = MGCP_AUEP_MANDATORY;
|
|
rc += msgb_printf(msg, "AUEP %u", trans_id);
|
|
break;
|
|
case MGCP_VERB_RSIP:
|
|
mandatory_mask = MGCP_RSIP_MANDATORY;
|
|
rc += msgb_printf(msg, "RSIP %u", trans_id);
|
|
break;
|
|
default:
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Invalid command verb, can not generate MGCP message\n");
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
/* Check if mandatory fields are missing */
|
|
if (!((mgcp_msg->presence & mandatory_mask) == mandatory_mask)) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"One or more missing mandatory fields, can not generate MGCP message\n");
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
/* Add endpoint name */
|
|
if (mgcp_msg->presence & MGCP_MSG_PRESENCE_ENDPOINT) {
|
|
if (strlen(mgcp_msg->endpoint) <= 0) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Empty endpoint name, can not generate MGCP message\n");
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
if (strstr(mgcp_msg->endpoint, "@") == NULL) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Endpoint name (%s) lacks separator (@), can not generate MGCP message\n",
|
|
mgcp_msg->endpoint);
|
|
msgb_free(msg);
|
|
}
|
|
|
|
rc += msgb_printf(msg, " %s", mgcp_msg->endpoint);
|
|
}
|
|
|
|
/* Add protocol version */
|
|
rc += msgb_printf(msg, " MGCP 1.0\r\n");
|
|
|
|
/* Add call id */
|
|
if (mgcp_msg->presence & MGCP_MSG_PRESENCE_CALL_ID)
|
|
rc += msgb_printf(msg, "C: %x\r\n", mgcp_msg->call_id);
|
|
|
|
/* Add connection id */
|
|
if (mgcp_msg->presence & MGCP_MSG_PRESENCE_CONN_ID) {
|
|
if (strlen(mgcp_msg->conn_id) <= 0) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"Empty connection id, can not generate MGCP message\n");
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
rc += msgb_printf(msg, "I: %s\r\n", mgcp_msg->conn_id);
|
|
}
|
|
|
|
/* Using SDP makes sense when a valid IP/Port combination is specifiec,
|
|
* if we do not know this information yet, we fall back to LCO */
|
|
if (mgcp_msg->presence & MGCP_MSG_PRESENCE_AUDIO_IP
|
|
&& mgcp_msg->presence & MGCP_MSG_PRESENCE_AUDIO_PORT)
|
|
use_sdp = true;
|
|
|
|
/* Add local connection options (LCO) */
|
|
if (!use_sdp
|
|
&& (mgcp_msg->verb == MGCP_VERB_CRCX
|
|
|| mgcp_msg->verb == MGCP_VERB_MDCX))
|
|
rc += add_lco(msg, mgcp_msg);
|
|
|
|
/* Add mode */
|
|
if (mgcp_msg->presence & MGCP_MSG_PRESENCE_CONN_MODE)
|
|
rc +=
|
|
msgb_printf(msg, "M: %s\r\n",
|
|
mgcp_client_cmode_name(mgcp_msg->conn_mode));
|
|
|
|
/* Add X-Osmo-IGN */
|
|
if ((mgcp_msg->presence & MGCP_MSG_PRESENCE_X_OSMO_IGN)
|
|
&& (mgcp_msg->x_osmo_ign != 0))
|
|
rc +=
|
|
msgb_printf(msg, MGCP_X_OSMO_IGN_HEADER "%s\r\n",
|
|
mgcp_msg->x_osmo_ign & MGCP_X_OSMO_IGN_CALLID ? " C": "");
|
|
|
|
/* Add session description protocol (SDP) */
|
|
if (use_sdp
|
|
&& (mgcp_msg->verb == MGCP_VERB_CRCX
|
|
|| mgcp_msg->verb == MGCP_VERB_MDCX)) {
|
|
rc_sdp = add_sdp(msg, mgcp_msg, mgcp);
|
|
if (rc_sdp == -2)
|
|
return NULL;
|
|
else
|
|
rc += rc_sdp;
|
|
}
|
|
|
|
if (rc != 0) {
|
|
LOGP(DLMGCP, LOGL_ERROR,
|
|
"message buffer to small, can not generate MGCP message\n");
|
|
msgb_free(msg);
|
|
msg = NULL;
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
|
|
/*! Retrieve the MGCP transaction ID from a msgb generated by mgcp_msg_gen()
|
|
* \param[in] msg message buffer
|
|
* \returns Transaction id. */
|
|
mgcp_trans_id_t mgcp_msg_trans_id(struct msgb *msg)
|
|
{
|
|
return (mgcp_trans_id_t)msg->cb[MSGB_CB_MGCP_TRANS_ID];
|
|
}
|
|
|
|
/*! Get the configuration parameters a given MGCP client instance
|
|
* \param[in] mgcp MGCP client descriptor.
|
|
* \returns configuration */
|
|
struct mgcp_client_conf *mgcp_client_conf_actual(struct mgcp_client *mgcp)
|
|
{
|
|
return &mgcp->actual;
|
|
}
|
|
|
|
const struct value_string mgcp_client_connection_mode_strs[] = {
|
|
{ MGCP_CONN_NONE, "none" },
|
|
{ MGCP_CONN_RECV_SEND, "sendrecv" },
|
|
{ MGCP_CONN_SEND_ONLY, "sendonly" },
|
|
{ MGCP_CONN_RECV_ONLY, "recvonly" },
|
|
{ MGCP_CONN_LOOPBACK, "loopback" },
|
|
{ 0, NULL }
|
|
};
|