112 lines
3.6 KiB
C
112 lines
3.6 KiB
C
/* MGCP common implementations.
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* These are used in libosmo-mgcp as well as libosmo-mgcp-client.
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* To avoid interdependency, these are implemented in .h file only. */
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/*
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* (C) 2017 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009-2012 by On-Waves
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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 Affero General Public License as published by
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* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero 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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/* Two copies of this file are kept in osmocom/mgcp/ and osmocom/mgcp_client/.
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* Since both are by definition identical, use the old header exclusion ifdefs
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* instead of '#pragma once' to avoid including both of these files.
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* Though at the time of writing there are no such users, this allows including
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* both libosmo-mgcp and libosmo-mgcp-client headers in the same file. */
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#ifndef OSMO_MGCP_COMMON_H
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#define OSMO_MGCP_COMMON_H
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#include <string.h>
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#include <errno.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/logging.h>
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#define for_each_non_empty_line(line, save) \
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for (line = strtok_r(NULL, "\r\n", &save); line; \
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line = strtok_r(NULL, "\r\n", &save))
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enum mgcp_connection_mode {
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MGCP_CONN_NONE = 0,
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MGCP_CONN_RECV_ONLY = 1,
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MGCP_CONN_SEND_ONLY = 2,
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MGCP_CONN_RECV_SEND = MGCP_CONN_RECV_ONLY | MGCP_CONN_SEND_ONLY,
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MGCP_CONN_LOOPBACK = 4 | MGCP_CONN_RECV_SEND,
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};
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#define MGCP_X_OSMO_IGN_HEADER "X-Osmo-IGN:"
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#define MGCP_X_OSMO_OSMUX_HEADER "X-Osmux:"
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/* Values should be bitwise-OR-able */
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enum mgcp_x_osmo_ign {
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MGCP_X_OSMO_IGN_NONE = 0,
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MGCP_X_OSMO_IGN_CALLID = 1,
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};
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/* Codec parameters (communicated via SDP/fmtp) */
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struct mgcp_codec_param {
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bool amr_octet_aligned_present;
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bool amr_octet_aligned;
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};
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/* Ensure that the msg->l2h is NUL terminated. */
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static inline int mgcp_msg_terminate_nul(struct msgb *msg)
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{
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unsigned char *tail = msg->l2h + msgb_l2len(msg); /* char after l2 data */
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if (tail[-1] == '\0')
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/* nothing to do */;
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else if (msgb_tailroom(msg) > 0)
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tail[0] = '\0';
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else if (tail[-1] == '\r' || tail[-1] == '\n')
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tail[-1] = '\0';
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else {
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LOGP(DLMGCP, LOGL_ERROR, "Cannot NUL terminate MGCP message: "
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"Length: %d, Buffer size: %d\n",
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msgb_l2len(msg), msg->data_len);
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return -ENOTSUP;
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}
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return 0;
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}
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/* Maximum length of the comment field */
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#define MGCP_COMMENT_MAXLEN 256
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/* Maximum allowed String length of Connection Identifiers as per spec
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* (see also RFC3435 2.1.3.2 Names of Connections), plus one for '\0'. */
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#define MGCP_CONN_ID_MAXLEN 32+1
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/* Deprecated: old name of MGCP_CONN_ID_MAXLEN. */
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#define MGCP_CONN_ID_LENGTH MGCP_CONN_ID_MAXLEN
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/* String length of Endpoint Identifiers.
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/ (see also RFC3435 section 3.2.1.3) */
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#define MGCP_ENDPOINT_MAXLEN (255*2+1+1)
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/* A prefix to denote the virtual trunk (RTP on both ends) */
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#define MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK "rtpbridge/"
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/* A prefix to denote the e1 trunk
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* (see also RFC3435 section E.2) */
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#define MGCP_ENDPOINT_PREFIX_E1_TRUNK "ds/e1-"
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/* Maximal number of payload types / codecs that can be negotiated via SDP at
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* at once. */
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#define MGCP_MAX_CODECS 10
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#endif
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