client.c revision 1.2
1 /* $NetBSD: client.c,v 1.2 2008/12/06 20:01:14 plunky Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 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 1.2 2008/12/06 20:01:14 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 #include "sdp.h" 39 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_name) 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->mru = mru; 122 chan->mtu = mtu; 123 b2eaddr(chan->raddr, &remote_bdaddr); 124 b2eaddr(chan->laddr, &local_bdaddr); 125 chan->state = CHANNEL_WAIT_CONNECT_RSP; 126 channel_timeout(chan, 10); 127 if (!channel_open(chan, fd)) 128 exit(EXIT_FAILURE); 129 130 bnep_send_control(chan, BNEP_SETUP_CONNECTION_REQUEST, 131 2, service_class, SDP_SERVICE_CLASS_PANU); 132 } 133 134 static void 135 client_query(void) 136 { 137 uint8_t buffer[512]; 138 sdp_attr_t attr; 139 uint32_t range; 140 void *ss; 141 int rv; 142 uint8_t *seq0, *seq1; 143 144 attr.flags = SDP_ATTR_INVALID; 145 attr.attr = 0; 146 attr.vlen = sizeof(buffer); 147 attr.value = buffer; 148 149 range = SDP_ATTR_RANGE(SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST, 150 SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST); 151 152 ss = sdp_open(&local_bdaddr, &remote_bdaddr); 153 if (ss == NULL || (errno = sdp_error(ss)) != 0) { 154 log_err("%s: %m", service_name); 155 exit(EXIT_FAILURE); 156 } 157 158 log_info("Searching for %s service at %s", 159 service_name, bt_ntoa(&remote_bdaddr, NULL)); 160 161 rv = sdp_search(ss, 1, &service_class, 1, &range, 1, &attr); 162 if (rv != 0) { 163 log_err("%s: %s", service_name, strerror(sdp_error(ss))); 164 exit(EXIT_FAILURE); 165 } 166 167 sdp_close(ss); 168 169 if (attr.flags != SDP_ATTR_OK 170 || attr.attr != SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST) { 171 log_err("%s service not found", service_name); 172 exit(EXIT_FAILURE); 173 } 174 175 /* 176 * we expect the following protocol descriptor list 177 * 178 * seq len 179 * seq len 180 * uuid value == L2CAP 181 * uint16 value16 => PSM 182 * seq len 183 * uuid value == BNEP 184 */ 185 if (_sdp_get_seq(&attr.value, attr.value + attr.vlen, &seq0) 186 && _sdp_get_seq(&seq0, attr.value, &seq1) 187 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_L2CAP) 188 && _sdp_get_uint16(&seq1, seq0, &l2cap_psm) 189 && _sdp_get_seq(&seq0, attr.value, &seq1) 190 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_BNEP)) { 191 log_info("Found PSM %d for service %s", l2cap_psm, service_name); 192 return; 193 } 194 195 log_err("%s query failed", service_name); 196 exit(EXIT_FAILURE); 197 } 198
Indexes created Tue Sep 23 23:09:58 GMT 2025