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 31#include <sys/cdefs.h> 32__RCSID("$NetBSD: client.c,v 1.2 2008/12/06 20:01:14 plunky Exp $"); 33 34#define L2CAP_SOCKET_CHECKED 35#include <bluetooth.h> 36#include <errno.h> 37#include <sdp.h> 38#include <unistd.h> 39 40#include "btpand.h" 41#include "bnep.h" 42#include "sdp.h" 43 44static void client_query(void); 45 46void 47client_init(void) 48{ 49 struct sockaddr_l2cap sa; 50 channel_t *chan; 51 socklen_t len; 52 int fd, n; 53 uint16_t mru, mtu; 54 55 if (bdaddr_any(&remote_bdaddr)) 56 return; 57 58 if (service_name) 59 client_query(); 60 61 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP); 62 if (fd == -1) { 63 log_err("Could not open L2CAP socket: %m"); 64 exit(EXIT_FAILURE); 65 } 66 67 memset(&sa, 0, sizeof(sa)); 68 sa.l2cap_family = AF_BLUETOOTH; 69 sa.l2cap_len = sizeof(sa); 70 sa.l2cap_bdaddr_type = BDADDR_BREDR; 71 sa.l2cap_cid = 0; 72 73 bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr); 74 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 75 log_err("Could not bind client socket: %m"); 76 exit(EXIT_FAILURE); 77 } 78 79 mru = BNEP_MTU_MIN; 80 if (setsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &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.l2cap_psm = htole16(l2cap_psm); 89 bdaddr_copy(&sa.l2cap_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, SOL_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(n); 106 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) { 107 log_err("Could not read SO_RCVBUF"); 108 exit(EXIT_FAILURE); 109 } 110 if (n < (mru * 10)) { 111 n = mru * 10; 112 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1) 113 log_info("Could not increase SO_RCVBUF (from %d)", n); 114 } 115 116 len = sizeof(mtu); 117 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 118 log_err("Could not get L2CAP OMTU: %m"); 119 exit(EXIT_FAILURE); 120 } 121 if (mtu < BNEP_MTU_MIN) { 122 log_err("L2CAP OMTU too small (%d)", mtu); 123 exit(EXIT_FAILURE); 124 } 125 126 len = sizeof(n); 127 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) { 128 log_err("Could not get socket send buffer size: %m"); 129 close(fd); 130 return; 131 } 132 if (n < (mtu * 2)) { 133 n = mtu * 2; 134 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) { 135 log_err("Could not set socket send buffer size (%d): %m", n); 136 close(fd); 137 return; 138 } 139 } 140 n = mtu; 141 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) { 142 log_err("Could not set socket low water mark (%d): %m", n); 143 close(fd); 144 return; 145 } 146 147 chan = channel_alloc(); 148 if (chan == NULL) 149 exit(EXIT_FAILURE); 150 151 chan->send = bnep_send; 152 chan->recv = bnep_recv; 153 chan->mru = mru; 154 chan->mtu = mtu; 155 b2eaddr(chan->raddr, &remote_bdaddr); 156 b2eaddr(chan->laddr, &local_bdaddr); 157 chan->state = CHANNEL_WAIT_CONNECT_RSP; 158 channel_timeout(chan, 10); 159 if (!channel_open(chan, fd)) 160 exit(EXIT_FAILURE); 161 162 bnep_send_control(chan, BNEP_SETUP_CONNECTION_REQUEST, 163 2, service_class, SDP_SERVICE_CLASS_PANU); 164} 165 166static void 167client_query(void) 168{ 169 uint8_t buffer[512]; 170 sdp_attr_t attr; 171 uint32_t range; 172 void *ss; 173 int rv; 174 uint8_t *seq0, *seq1; 175 176 attr.flags = SDP_ATTR_INVALID; 177 attr.attr = 0; 178 attr.vlen = sizeof(buffer); 179 attr.value = buffer; 180 181 range = SDP_ATTR_RANGE(SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST, 182 SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST); 183 184 ss = sdp_open(&local_bdaddr, &remote_bdaddr); 185 if (ss == NULL || (errno = sdp_error(ss)) != 0) { 186 log_err("%s: %m", service_name); 187 exit(EXIT_FAILURE); 188 } 189 190 log_info("Searching for %s service at %s", 191 service_name, bt_ntoa(&remote_bdaddr, NULL)); 192 193 rv = sdp_search(ss, 1, &service_class, 1, &range, 1, &attr); 194 if (rv != 0) { 195 log_err("%s: %s", service_name, strerror(sdp_error(ss))); 196 exit(EXIT_FAILURE); 197 } 198 199 sdp_close(ss); 200 201 if (attr.flags != SDP_ATTR_OK 202 || attr.attr != SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST) { 203 log_err("%s service not found", service_name); 204 exit(EXIT_FAILURE); 205 } 206 207 /* 208 * we expect the following protocol descriptor list 209 * 210 * seq len 211 * seq len 212 * uuid value == L2CAP 213 * uint16 value16 => PSM 214 * seq len 215 * uuid value == BNEP 216 */ 217 if (_sdp_get_seq(&attr.value, attr.value + attr.vlen, &seq0) 218 && _sdp_get_seq(&seq0, attr.value, &seq1) 219 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_L2CAP) 220 && _sdp_get_uint16(&seq1, seq0, &l2cap_psm) 221 && _sdp_get_seq(&seq0, attr.value, &seq1) 222 && _sdp_match_uuid16(&seq1, seq0, SDP_UUID_PROTOCOL_BNEP)) { 223 log_info("Found PSM %d for service %s", l2cap_psm, service_name); 224 return; 225 } 226 227 log_err("%s query failed", service_name); 228 exit(EXIT_FAILURE); 229} 230