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Neels Hofmeyrd95ab1e2017-09-22 00:52:54 +02001/* MGCP common implementations.
2 * These are used in libosmo-mgcp as well as libosmo-mgcp-client.
3 * To avoid interdependency, these are implemented in .h file only. */
4
5/*
6 * (C) 2017 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
7 * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org>
8 * (C) 2009-2012 by On-Waves
9 * All Rights Reserved
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Affero General Public License as published by
13 * the Free Software Foundation; either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Affero General Public License for more details.
20 *
21 * You should have received a copy of the GNU Affero General Public License
22 * along with this program. If not, see <http://www.gnu.org/licenses/>.
23 *
24 */
25
26/* Two copies of this file are kept in osmocom/mgcp/ and osmocom/mgcp_client/.
27 * Since both are by definition identical, use the old header exclusion ifdefs
28 * instead of '#pragma once' to avoid including both of these files.
29 * Though at the time of writing there are no such users, this allows including
30 * both libosmo-mgcp and libosmo-mgcp-client headers in the same file. */
31#ifndef OSMO_MGCP_COMMON_H
32#define OSMO_MGCP_COMMON_H
33
34#include <string.h>
35#include <errno.h>
36
37#include <osmocom/core/msgb.h>
38#include <osmocom/core/logging.h>
39
40#define for_each_non_empty_line(line, save) \
41 for (line = strtok_r(NULL, "\r\n", &save); line; \
42 line = strtok_r(NULL, "\r\n", &save))
43
44enum mgcp_connection_mode {
45 MGCP_CONN_NONE = 0,
46 MGCP_CONN_RECV_ONLY = 1,
47 MGCP_CONN_SEND_ONLY = 2,
48 MGCP_CONN_RECV_SEND = MGCP_CONN_RECV_ONLY | MGCP_CONN_SEND_ONLY,
49 MGCP_CONN_LOOPBACK = 4 | MGCP_CONN_RECV_SEND,
50};
51
52/* Ensure that the msg->l2h is NUL terminated. */
53static inline int mgcp_msg_terminate_nul(struct msgb *msg)
54{
55 unsigned char *tail = msg->l2h + msgb_l2len(msg); /* char after l2 data */
56 if (tail[-1] == '\0')
57 /* nothing to do */;
58 else if (msgb_tailroom(msg) > 0)
59 tail[0] = '\0';
60 else if (tail[-1] == '\r' || tail[-1] == '\n')
61 tail[-1] = '\0';
62 else {
63 LOGP(DLMGCP, LOGL_ERROR, "Cannot NUL terminate MGCP message: "
64 "Length: %d, Buffer size: %d\n",
65 msgb_l2len(msg), msg->data_len);
66 return -ENOTSUP;
67 }
68 return 0;
69}
70
Philipp Maierabe8c892018-01-20 00:15:12 +010071/* Maximum length of the comment field */
72#define MGCP_COMMENT_MAXLEN 256
73
Philipp Maier01d24a32017-11-21 17:26:09 +010074/* String length of Connection Identifiers
75 * (see also RFC3435 2.1.3.2 Names of Connections) */
76#define MGCP_CONN_ID_LENGTH 32+1
77
Philipp Maier6efb43a2018-01-15 13:59:10 +010078/* String length of Endpoint Identifiers.
79/ (see also RFC3435 section 3.2.1.3) */
80#define MGCP_ENDPOINT_MAXLEN (255*2+1+1)
81
Philipp Maier7f0966c2018-01-17 18:18:12 +010082/* A prefix to denote the virtual trunk (RTP on both ends) */
83#define MGCP_ENDPOINT_PREFIX_VIRTUAL_TRUNK "rtpbridge/"
84
Philipp Maierbc0346e2018-06-07 09:52:16 +020085/* Maximal number of payload types / codecs that can be negotiated via SDP at
86 * at once. */
87#define MGCP_MAX_CODECS 10
88
Neels Hofmeyrd95ab1e2017-09-22 00:52:54 +020089#endif