4 * SPDX-License-Identifier: BSD-2-Clause
6 * Copyright (c) 2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * $Id: rfcomm_sdp.c,v 1.1 2003/09/07 18:15:55 max Exp $
33 #define L2CAP_SOCKET_CHECKED
34 #include <bluetooth.h>
39 #undef PROTOCOL_DESCRIPTOR_LIST_BUFFER_SIZE
40 #define PROTOCOL_DESCRIPTOR_LIST_BUFFER_SIZE 256
42 #undef PROTOCOL_DESCRIPTOR_LIST_MINIMAL_SIZE
43 #define PROTOCOL_DESCRIPTOR_LIST_MINIMAL_SIZE 12
45 static int rfcomm_proto_list_parse (uint8_t const *start, uint8_t const *end,
46 int *channel, int *error);
49 * Lookup RFCOMM channel number in the Protocol Descriptor List
52 #undef rfcomm_channel_lookup_exit
53 #define rfcomm_channel_lookup_exit(e) { \
60 return (((e) == 0)? 0 : -1); \
64 rfcomm_channel_lookup(bdaddr_t const *local, bdaddr_t const *remote,
65 int service, int *channel, int *error)
67 uint8_t buffer[PROTOCOL_DESCRIPTOR_LIST_BUFFER_SIZE];
69 uint16_t serv = (uint16_t) service;
70 uint32_t attr = SDP_ATTR_RANGE(
71 SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST,
72 SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
73 sdp_attr_t proto = { SDP_ATTR_INVALID,0,sizeof(buffer),buffer };
77 local = NG_HCI_BDADDR_ANY;
78 if (remote == NULL || channel == NULL)
79 rfcomm_channel_lookup_exit(EINVAL);
81 if ((ss = sdp_open(local, remote)) == NULL)
82 rfcomm_channel_lookup_exit(ENOMEM);
83 if (sdp_error(ss) != 0)
84 rfcomm_channel_lookup_exit(sdp_error(ss));
86 if (sdp_search(ss, 1, &serv, 1, &attr, 1, &proto) != 0)
87 rfcomm_channel_lookup_exit(sdp_error(ss));
88 if (proto.flags != SDP_ATTR_OK)
89 rfcomm_channel_lookup_exit(ENOATTR);
95 * If it is possible for more than one kind of protocol stack to be
96 * used to gain access to the service, the ProtocolDescriptorList
97 * takes the form of a data element alternative. We always use the
98 * first protocol stack.
100 * A minimal Protocol Descriptor List for RFCOMM based service would
103 * seq8 len8 - 2 bytes
104 * seq8 len8 - 2 bytes
105 * uuid16 value16 - 3 bytes L2CAP
106 * seq8 len8 - 2 bytes
107 * uuid16 value16 - 3 bytes RFCOMM
108 * uint8 value8 - 2 bytes RFCOMM param #1
112 * Lets not count first [seq8 len8] wrapper, so the minimal size of
113 * the Protocol Descriptor List (the data we are actually interested
114 * in) for RFCOMM based service would be 12 bytes.
117 if (proto.vlen < PROTOCOL_DESCRIPTOR_LIST_MINIMAL_SIZE)
118 rfcomm_channel_lookup_exit(EINVAL);
120 SDP_GET8(type, proto.value);
122 if (type == SDP_DATA_ALT8) {
123 SDP_GET8(len, proto.value);
124 } else if (type == SDP_DATA_ALT16) {
125 SDP_GET16(len, proto.value);
126 } else if (type == SDP_DATA_ALT32) {
127 SDP_GET32(len, proto.value);
132 SDP_GET8(type, proto.value);
136 SDP_GET8(len, proto.value);
140 SDP_GET16(len, proto.value);
144 SDP_GET32(len, proto.value);
148 rfcomm_channel_lookup_exit(ENOATTR);
152 if (len < PROTOCOL_DESCRIPTOR_LIST_MINIMAL_SIZE)
153 rfcomm_channel_lookup_exit(EINVAL);
155 return (rfcomm_proto_list_parse(proto.value,
156 buffer + proto.vlen, channel, error));
160 * Parse protocol descriptor list
162 * The ProtocolDescriptorList attribute describes one or more protocol
163 * stacks that may be used to gain access to the service described by
164 * the service record. If the ProtocolDescriptorList describes a single
165 * stack, it takes the form of a data element sequence in which each
166 * element of the sequence is a protocol descriptor.
169 #undef rfcomm_proto_list_parse_exit
170 #define rfcomm_proto_list_parse_exit(e) { \
173 return (((e) == 0)? 0 : -1); \
177 rfcomm_proto_list_parse(uint8_t const *start, uint8_t const *end,
178 int *channel, int *error)
180 int type, len, value;
182 while (start < end) {
185 * Parse protocol descriptor
187 * A protocol descriptor identifies a communications protocol
188 * and provides protocol specific parameters. A protocol
189 * descriptor is represented as a data element sequence. The
190 * first data element in the sequence must be the UUID that
191 * identifies the protocol. Additional data elements optionally
192 * provide protocol specific information, such as the L2CAP
193 * protocol/service multiplexer (PSM) and the RFCOMM server
194 * channel number (CN).
197 /* We must have at least one byte (type) */
199 rfcomm_proto_list_parse_exit(EINVAL)
201 SDP_GET8(type, start);
204 SDP_GET8(len, start);
208 SDP_GET16(len, start);
212 SDP_GET32(len, start);
216 rfcomm_proto_list_parse_exit(ENOATTR)
220 /* We must have at least 3 bytes (type + UUID16) */
222 rfcomm_proto_list_parse_exit(EINVAL);
224 /* Get protocol UUID */
225 SDP_GET8(type, start); len -= sizeof(uint8_t);
227 case SDP_DATA_UUID16:
228 SDP_GET16(value, start); len -= sizeof(uint16_t);
229 if (value != SDP_UUID_PROTOCOL_RFCOMM)
233 case SDP_DATA_UUID32: /* XXX FIXME can we have 32-bit UUID */
234 case SDP_DATA_UUID128: /* XXX FIXME can we have 128-bit UUID */
236 rfcomm_proto_list_parse_exit(ENOATTR);
241 * First protocol specific parameter for RFCOMM procotol must
242 * be uint8 that represents RFCOMM channel number. So we must
243 * have at least two bytes.
247 rfcomm_proto_list_parse_exit(EINVAL);
249 SDP_GET8(type, start);
250 if (type != SDP_DATA_UINT8)
251 rfcomm_proto_list_parse_exit(ENOATTR);
253 SDP_GET8(*channel, start);
255 rfcomm_proto_list_parse_exit(0);
262 * If we got here then it means we could not find RFCOMM protocol
263 * descriptor, but the reply format was actually valid.
266 rfcomm_proto_list_parse_exit(ENOATTR);