1 /* $NetBSD: client.c,v 1.2 2008/12/06 20:01:14 plunky Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 5 * 6 * Copyright (c) 2008 Iain Hibbert 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 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. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 /* $FreeBSD$ */ 31 32 #include <sys/cdefs.h> 33 __RCSID("$NetBSD: client.c,v 1.2 2008/12/06 20:01:14 plunky Exp $"); 34 35 #define L2CAP_SOCKET_CHECKED 36 #include <bluetooth.h> 37 #include <errno.h> 38 #include <sdp.h> 39 #include <unistd.h> 40 41 #include "btpand.h" 42 #include "bnep.h" 43 #include "sdp.h" 44 45 static void client_query(void); 46 47 void 48 client_init(void) 49 { 50 struct sockaddr_l2cap sa; 51 channel_t *chan; 52 socklen_t len; 53 int fd, n; 54 uint16_t mru, mtu; 55 56 if (bdaddr_any(&remote_bdaddr)) 57 return; 58 59 if (service_name) 60 client_query(); 61 62 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP); 63 if (fd == -1) { 64 log_err("Could not open L2CAP socket: %m"); 65 exit(EXIT_FAILURE); 66 } 67 68 memset(&sa, 0, sizeof(sa)); 69 sa.l2cap_family = AF_BLUETOOTH; 70 sa.l2cap_len = sizeof(sa); 71 sa.l2cap_bdaddr_type = BDADDR_BREDR; 72 sa.l2cap_cid = 0; 73 74 bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr); 75 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 76 log_err("Could not bind client socket: %m"); 77 exit(EXIT_FAILURE); 78 } 79 80 mru = BNEP_MTU_MIN; 81 if (setsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) { 82 log_err("Could not set L2CAP IMTU (%d): %m", mru); 83 exit(EXIT_FAILURE); 84 } 85 86 log_info("Opening connection to service 0x%4.4x at %s", 87 service_class, bt_ntoa(&remote_bdaddr, NULL)); 88 89 sa.l2cap_psm = htole16(l2cap_psm); 90 bdaddr_copy(&sa.l2cap_bdaddr, &remote_bdaddr); 91 if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 92 log_err("Could not connect: %m"); 93 exit(EXIT_FAILURE); 94 } 95 96 len = sizeof(mru); 97 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) { 98 log_err("Could not get IMTU: %m"); 99 exit(EXIT_FAILURE); 100 } 101 if (mru < BNEP_MTU_MIN) { 102 log_err("L2CAP IMTU too small (%d)", mru); 103 exit(EXIT_FAILURE); 104 } 105 106 len = sizeof(n); 107 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) { 108 log_err("Could not read SO_RCVBUF"); 109 exit(EXIT_FAILURE); 110 } 111 if (n < (mru * 10)) { 112 n = mru * 10; 113 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1) 114 log_info("Could not increase SO_RCVBUF (from %d)", n); 115 } 116 117 len = sizeof(mtu); 118 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 119 log_err("Could not get L2CAP OMTU: %m"); 120 exit(EXIT_FAILURE); 121 } 122 if (mtu < BNEP_MTU_MIN) { 123 log_err("L2CAP OMTU too small (%d)", mtu); 124 exit(EXIT_FAILURE); 125 } 126 127 len = sizeof(n); 128 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) { 129 log_err("Could not get socket send buffer size: %m"); 130 close(fd); 131 return; 132 } 133 if (n < (mtu * 2)) { 134 n = mtu * 2; 135 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) { 136 log_err("Could not set socket send buffer size (%d): %m", n); 137 close(fd); 138 return; 139 } 140 } 141 n = mtu; 142 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) { 143 log_err("Could not set socket low water mark (%d): %m", n); 144 close(fd); 145 return; 146 } 147 148 chan = channel_alloc(); 149 if (chan == NULL) 150 exit(EXIT_FAILURE); 151 152 chan->send = bnep_send; 153 chan->recv = bnep_recv; 154 chan->mru = mru; 155 chan->mtu = mtu; 156 b2eaddr(chan->raddr, &remote_bdaddr); 157 b2eaddr(chan->laddr, &local_bdaddr); 158 chan->state = CHANNEL_WAIT_CONNECT_RSP; 159 channel_timeout(chan, 10); 160 if (!channel_open(chan, fd)) 161 exit(EXIT_FAILURE); 162 163 bnep_send_control(chan, BNEP_SETUP_CONNECTION_REQUEST, 164 2, service_class, SDP_SERVICE_CLASS_PANU); 165 } 166 167 static void 168 client_query(void) 169 { 170 uint8_t buffer[512]; 171 sdp_attr_t attr; 172 uint32_t range; 173 void *ss; 174 int rv; 175 uint8_t *seq0, *seq1; 176 177 attr.flags = SDP_ATTR_INVALID; 178 attr.attr = 0; 179 attr.vlen = sizeof(buffer); 180 attr.value = buffer; 181 182 range = SDP_ATTR_RANGE(SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST, 183 SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST); 184 185 ss = sdp_open(&local_bdaddr, &remote_bdaddr); 186 if (ss == NULL || (errno = sdp_error(ss)) != 0) { 187 log_err("%s: %m", service_name); 188 exit(EXIT_FAILURE); 189 } 190 191 log_info("Searching for %s service at %s", 192 service_name, bt_ntoa(&remote_bdaddr, NULL)); 193 194 rv = sdp_search(ss, 1, &service_class, 1, &range, 1, &attr); 195 if (rv != 0) { 196 log_err("%s: %s", service_name, strerror(sdp_error(ss))); 197 exit(EXIT_FAILURE); 198 } 199 200 sdp_close(ss); 201 202 if (attr.flags != SDP_ATTR_OK 203 || attr.attr != SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST) { 204 log_err("%s service not found", service_name); 205 exit(EXIT_FAILURE); 206 } 207 208 /* 209 * we expect the following protocol descriptor list 210 * 211 * seq len 212 * seq len 213 * uuid value == L2CAP 214 * uint16 value16 => PSM 215 * seq len 216 * uuid value == BNEP 217 */ 218 if (_sdp_get_seq(&attr.value, attr.value + attr.vlen, &seq0) 219 && _sdp_get_seq(&seq0, attr.value, &seq1) 220 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_L2CAP) 221 && _sdp_get_uint16(&seq1, seq0, &l2cap_psm) 222 && _sdp_get_seq(&seq0, attr.value, &seq1) 223 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_BNEP)) { 224 log_info("Found PSM %d for service %s", l2cap_psm, service_name); 225 return; 226 } 227 228 log_err("%s query failed", service_name); 229 exit(EXIT_FAILURE); 230 } 231