1 /* $NetBSD: client.c,v 1.4 2009/05/12 21:50:38 plunky Exp $ */ 2 3 /*- 4 * Copyright (c) 2008-2009 Iain Hibbert 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __RCSID("$NetBSD: client.c,v 1.4 2009/05/12 21:50:38 plunky Exp $"); 30 31 #include <bluetooth.h> 32 #include <errno.h> 33 #include <sdp.h> 34 #include <unistd.h> 35 36 #include "btpand.h" 37 #include "bnep.h" 38 39 static void client_down(channel_t *); 40 static void client_query(void); 41 42 void 43 client_init(void) 44 { 45 struct sockaddr_bt sa; 46 channel_t *chan; 47 socklen_t len; 48 int fd; 49 uint16_t mru, mtu; 50 51 if (bdaddr_any(&remote_bdaddr)) 52 return; 53 54 if (service_type) 55 client_query(); 56 57 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); 58 if (fd == -1) { 59 log_err("Could not open L2CAP socket: %m"); 60 exit(EXIT_FAILURE); 61 } 62 63 memset(&sa, 0, sizeof(sa)); 64 sa.bt_family = AF_BLUETOOTH; 65 sa.bt_len = sizeof(sa); 66 bdaddr_copy(&sa.bt_bdaddr, &local_bdaddr); 67 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 68 log_err("Could not bind client socket: %m"); 69 exit(EXIT_FAILURE); 70 } 71 72 if (setsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_LM, 73 &l2cap_mode, sizeof(l2cap_mode)) == -1) { 74 log_err("Could not set link mode (0x%4.4x): %m", l2cap_mode); 75 exit(EXIT_FAILURE); 76 } 77 78 mru = BNEP_MTU_MIN; 79 if (setsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU, 80 &mru, sizeof(mru)) == -1) { 81 log_err("Could not set L2CAP IMTU (%d): %m", mru); 82 exit(EXIT_FAILURE); 83 } 84 85 log_info("Opening connection to service 0x%4.4x at %s", 86 service_class, bt_ntoa(&remote_bdaddr, NULL)); 87 88 sa.bt_psm = l2cap_psm; 89 bdaddr_copy(&sa.bt_bdaddr, &remote_bdaddr); 90 if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 91 log_err("Could not connect: %m"); 92 exit(EXIT_FAILURE); 93 } 94 95 len = sizeof(mru); 96 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) { 97 log_err("Could not get IMTU: %m"); 98 exit(EXIT_FAILURE); 99 } 100 if (mru < BNEP_MTU_MIN) { 101 log_err("L2CAP IMTU too small (%d)", mru); 102 exit(EXIT_FAILURE); 103 } 104 105 len = sizeof(mtu); 106 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 107 log_err("Could not get L2CAP OMTU: %m"); 108 exit(EXIT_FAILURE); 109 } 110 if (mtu < BNEP_MTU_MIN) { 111 log_err("L2CAP OMTU too small (%d)", mtu); 112 exit(EXIT_FAILURE); 113 } 114 115 chan = channel_alloc(); 116 if (chan == NULL) 117 exit(EXIT_FAILURE); 118 119 chan->send = bnep_send; 120 chan->recv = bnep_recv; 121 chan->down = client_down; 122 chan->mru = mru; 123 chan->mtu = mtu; 124 b2eaddr(chan->raddr, &remote_bdaddr); 125 b2eaddr(chan->laddr, &local_bdaddr); 126 chan->state = CHANNEL_WAIT_CONNECT_RSP; 127 channel_timeout(chan, 10); 128 if (!channel_open(chan, fd)) 129 exit(EXIT_FAILURE); 130 131 bnep_send_control(chan, BNEP_SETUP_CONNECTION_REQUEST, 132 2, service_class, SDP_SERVICE_CLASS_PANU); 133 } 134 135 static void 136 client_down(channel_t *chan) 137 { 138 139 log_err("Client connection shut down, exiting"); 140 exit(EXIT_FAILURE); 141 } 142 143 static void 144 client_query(void) 145 { 146 uint8_t buf[12]; /* enough for SSP and AIL both */ 147 sdp_session_t ss; 148 sdp_data_t ssp, ail, rsp, rec, value, pdl, seq; 149 uintmax_t psm; 150 uint16_t attr; 151 bool rv; 152 153 ss = sdp_open(&local_bdaddr, &remote_bdaddr); 154 if (ss == NULL) { 155 log_err("%s: %m", service_type); 156 exit(EXIT_FAILURE); 157 } 158 159 log_info("Searching for %s service at %s", 160 service_type, bt_ntoa(&remote_bdaddr, NULL)); 161 162 seq.next = buf; 163 seq.end = buf + sizeof(buf); 164 165 /* 166 * build ServiceSearchPattern (9 bytes) 167 * 168 * uuid16 "service_class" 169 * uuid16 L2CAP 170 * uuid16 BNEP 171 */ 172 ssp.next = seq.next; 173 sdp_put_uuid16(&seq, service_class); 174 sdp_put_uuid16(&seq, SDP_UUID_PROTOCOL_L2CAP); 175 sdp_put_uuid16(&seq, SDP_UUID_PROTOCOL_BNEP); 176 ssp.end = seq.next; 177 178 /* 179 * build AttributeIDList (3 bytes) 180 * 181 * uint16 ProtocolDescriptorList 182 */ 183 ail.next = seq.next; 184 sdp_put_uint16(&seq, SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST); 185 ail.end = seq.next; 186 187 rv = sdp_service_search_attribute(ss, &ssp, &ail, &rsp); 188 if (!rv) { 189 log_err("%s: %m", service_type); 190 exit(EXIT_FAILURE); 191 } 192 193 /* 194 * we expect the response to contain a list of records 195 * containing a ProtocolDescriptorList. Find the first 196 * one containing L2CAP and BNEP protocols and extract 197 * the PSM. 198 */ 199 rv = false; 200 while (!rv && sdp_get_seq(&rsp, &rec)) { 201 if (!sdp_get_attr(&rec, &attr, &value) 202 || attr != SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST) 203 continue; 204 205 sdp_get_alt(&value, &value); /* drop any alt header */ 206 while (!rv && sdp_get_seq(&value, &pdl)) { 207 if (sdp_get_seq(&pdl, &seq) 208 && sdp_match_uuid16(&seq, SDP_UUID_PROTOCOL_L2CAP) 209 && sdp_get_uint(&seq, &psm) 210 && sdp_get_seq(&pdl, &seq) 211 && sdp_match_uuid16(&seq, SDP_UUID_PROTOCOL_BNEP)) 212 rv = true; 213 } 214 } 215 216 sdp_close(ss); 217 218 if (!rv) { 219 log_err("%s query failed", service_type); 220 exit(EXIT_FAILURE); 221 } 222 223 l2cap_psm = (uint16_t)psm; 224 log_info("Found PSM %u for service %s", l2cap_psm, service_type); 225 } 226