1 /* $NetBSD: server.c,v 1.7 2011/02/08 21:59:50 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: server.c,v 1.7 2011/02/08 21:59:50 plunky Exp $"); 30 31 #include <sys/ioctl.h> 32 33 #include <net/ethertypes.h> 34 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 43 static struct event server_ev; 44 static int server_count; 45 46 static sdp_session_t server_ss; 47 static uint32_t server_handle; 48 static sdp_data_t server_record; 49 50 static char * server_ipv4_subnet; 51 static char * server_ipv6_subnet; 52 static uint16_t server_proto[] = { ETHERTYPE_IP, ETHERTYPE_ARP, ETHERTYPE_IPV6 }; 53 static size_t server_nproto = __arraycount(server_proto); 54 55 static void server_open(void); 56 static void server_read(int, short, void *); 57 static void server_down(channel_t *); 58 static void server_update(void); 59 static void server_mkrecord(void); 60 61 void 62 server_init(void) 63 { 64 65 if (server_limit == 0) 66 return; 67 68 server_open(); 69 server_update(); 70 } 71 72 /* 73 * Start listening on server socket 74 */ 75 static void 76 server_open(void) 77 { 78 struct sockaddr_bt sa; 79 socklen_t len; 80 uint16_t mru; 81 int fd; 82 83 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); 84 if (fd == -1) { 85 log_err("Could not open L2CAP socket: %m"); 86 exit(EXIT_FAILURE); 87 } 88 89 memset(&sa, 0, sizeof(sa)); 90 sa.bt_family = AF_BLUETOOTH; 91 sa.bt_len = sizeof(sa); 92 sa.bt_psm = l2cap_psm; 93 bdaddr_copy(&sa.bt_bdaddr, &local_bdaddr); 94 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 95 log_err("Could not bind server socket: %m"); 96 exit(EXIT_FAILURE); 97 } 98 99 if (setsockopt(fd, BTPROTO_L2CAP, 100 SO_L2CAP_LM, &l2cap_mode, sizeof(l2cap_mode)) == -1) { 101 log_err("Could not set link mode (0x%4.4x): %m", l2cap_mode); 102 exit(EXIT_FAILURE); 103 } 104 len = sizeof(l2cap_mode); 105 getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_LM, &l2cap_mode, &len); 106 107 mru = BNEP_MTU_MIN; 108 if (setsockopt(fd, BTPROTO_L2CAP, 109 SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) { 110 log_err("Could not set L2CAP IMTU (%d): %m", mru); 111 exit(EXIT_FAILURE); 112 } 113 114 if (listen(fd, 0) == -1) { 115 log_err("Could not listen on server socket: %m"); 116 exit(EXIT_FAILURE); 117 } 118 119 event_set(&server_ev, fd, EV_READ | EV_PERSIST, server_read, NULL); 120 if (event_add(&server_ev, NULL) == -1) { 121 log_err("Could not add server event: %m"); 122 exit(EXIT_FAILURE); 123 } 124 125 log_info("server socket open"); 126 } 127 128 /* 129 * handle connection request 130 */ 131 static void 132 server_read(int s, short ev, void *arg) 133 { 134 struct sockaddr_bt ra, la; 135 channel_t *chan; 136 socklen_t len; 137 int fd, n, bufsize; 138 uint16_t mru, mtu; 139 140 assert(server_count < server_limit); 141 142 len = sizeof(ra); 143 fd = accept(s, (struct sockaddr *)&ra, &len); 144 if (fd == -1) 145 return; 146 147 n = 1; 148 if (ioctl(fd, FIONBIO, &n) == -1) { 149 log_err("Could not set NonBlocking IO: %m"); 150 close(fd); 151 return; 152 } 153 154 len = sizeof(mru); 155 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) { 156 log_err("Could not get L2CAP IMTU: %m"); 157 close(fd); 158 return; 159 } 160 if(mru < BNEP_MTU_MIN) { 161 log_err("L2CAP IMTU too small (%d)", mru); 162 close(fd); 163 return; 164 } 165 166 len = sizeof(bufsize); 167 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bufsize, &len) == -1) { 168 log_err("Could not read SO_RCVBUF"); 169 close(fd); 170 return; 171 } 172 if (bufsize < 10 * mru) { 173 bufsize = 10 * mru; 174 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bufsize, 175 sizeof(bufsize)) == -1) 176 log_info("Could not increase SO_RCVBUF (from %d)", 177 bufsize); 178 } 179 180 len = sizeof(mtu); 181 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 182 log_err("Could not get L2CAP OMTU: %m"); 183 close(fd); 184 return; 185 } 186 if (mtu < BNEP_MTU_MIN) { 187 log_err("L2CAP OMTU too small (%d)", mtu); 188 close(fd); 189 return; 190 } 191 192 len = sizeof(n); 193 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) { 194 log_err("Could not get socket send buffer size: %m"); 195 close(fd); 196 return; 197 } 198 199 if (n < (mtu * 2)) { 200 n = mtu * 2; 201 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) { 202 log_err("Could not set socket send buffer size (%d): %m", n); 203 close(fd); 204 return; 205 } 206 } 207 208 n = mtu; 209 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) { 210 log_err("Could not set socket low water mark (%d): %m", n); 211 close(fd); 212 return; 213 } 214 215 len = sizeof(la); 216 if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) { 217 log_err("Could not get socket address: %m"); 218 close(fd); 219 return; 220 } 221 222 log_info("Accepted connection from %s", bt_ntoa(&ra.bt_bdaddr, NULL)); 223 224 chan = channel_alloc(); 225 if (chan == NULL) { 226 close(fd); 227 return; 228 } 229 230 chan->send = bnep_send; 231 chan->recv = bnep_recv; 232 chan->down = server_down; 233 chan->mru = mru; 234 chan->mtu = mtu; 235 b2eaddr(chan->raddr, &ra.bt_bdaddr); 236 b2eaddr(chan->laddr, &la.bt_bdaddr); 237 chan->state = CHANNEL_WAIT_CONNECT_REQ; 238 channel_timeout(chan, 10); 239 if (!channel_open(chan, fd)) { 240 chan->state = CHANNEL_CLOSED; 241 channel_free(chan); 242 close(fd); 243 return; 244 } 245 246 if (++server_count == server_limit) { 247 log_info("Server limit reached, closing server socket"); 248 event_del(&server_ev); 249 close(s); 250 } 251 252 server_update(); 253 } 254 255 /* 256 * Shut down a server channel, we need to update the service record and 257 * may want to restart accepting connections on the server socket 258 */ 259 static void 260 server_down(channel_t *chan) 261 { 262 263 assert(server_count > 0); 264 265 channel_close(chan); 266 267 if (server_count-- == server_limit) 268 server_open(); 269 270 server_update(); 271 } 272 273 static void 274 server_update(void) 275 { 276 bool rv; 277 278 if (service_type == NULL) 279 return; 280 281 if (server_ss == NULL) { 282 server_ss = sdp_open_local(control_path); 283 if (server_ss == NULL) { 284 log_err("failed to contact SDP server"); 285 return; 286 } 287 } 288 289 server_mkrecord(); 290 291 if (server_handle == 0) 292 rv = sdp_record_insert(server_ss, &local_bdaddr, 293 &server_handle, &server_record); 294 else 295 rv = sdp_record_update(server_ss, server_handle, 296 &server_record); 297 298 if (!rv) { 299 log_err("%s: %m", service_type); 300 exit(EXIT_FAILURE); 301 } 302 } 303 304 static void 305 server_mkrecord(void) 306 { 307 static uint8_t data[256]; /* tis enough */ 308 sdp_data_t buf; 309 size_t i; 310 311 buf.next = data; 312 buf.end = data + sizeof(data); 313 314 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_RECORD_HANDLE); 315 sdp_put_uint32(&buf, 0x00000000); 316 317 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_CLASS_ID_LIST); 318 sdp_put_seq(&buf, 3); 319 sdp_put_uuid16(&buf, service_class); 320 321 sdp_put_uint16(&buf, SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST); 322 sdp_put_seq(&buf, 8 + 10 + 3 * server_nproto); 323 sdp_put_seq(&buf, 6); 324 sdp_put_uuid16(&buf, SDP_UUID_PROTOCOL_L2CAP); 325 sdp_put_uint16(&buf, l2cap_psm); 326 sdp_put_seq(&buf, 8 + 3 * server_nproto); 327 sdp_put_uuid16(&buf, SDP_UUID_PROTOCOL_BNEP); 328 sdp_put_uint16(&buf, 0x0100); /* v1.0 */ 329 sdp_put_seq(&buf, 3 * server_nproto); 330 for (i = 0; i < server_nproto; i++) 331 sdp_put_uint16(&buf, server_proto[i]); 332 333 sdp_put_uint16(&buf, SDP_ATTR_BROWSE_GROUP_LIST); 334 sdp_put_seq(&buf, 3); 335 sdp_put_uuid16(&buf, SDP_SERVICE_CLASS_PUBLIC_BROWSE_GROUP); 336 337 sdp_put_uint16(&buf, SDP_ATTR_LANGUAGE_BASE_ATTRIBUTE_ID_LIST); 338 sdp_put_seq(&buf, 9); 339 sdp_put_uint16(&buf, 0x656e); /* "en" */ 340 sdp_put_uint16(&buf, 106); /* UTF-8 */ 341 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID); 342 343 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_AVAILABILITY); 344 sdp_put_uint8(&buf, (UINT8_MAX - server_count * UINT8_MAX / server_limit)); 345 346 sdp_put_uint16(&buf, SDP_ATTR_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 347 sdp_put_seq(&buf, 8); 348 sdp_put_seq(&buf, 6); 349 sdp_put_uuid16(&buf, service_class); 350 sdp_put_uint16(&buf, 0x0100); /* v1.0 */ 351 352 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID 353 + SDP_ATTR_SERVICE_NAME_OFFSET); 354 sdp_put_str(&buf, service_name, -1); 355 356 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID 357 + SDP_ATTR_SERVICE_DESCRIPTION_OFFSET); 358 sdp_put_str(&buf, service_desc, -1); 359 360 sdp_put_uint16(&buf, SDP_ATTR_SECURITY_DESCRIPTION); 361 sdp_put_uint16(&buf, (l2cap_mode & L2CAP_LM_AUTH) ? 0x0001 : 0x0000); 362 363 if (service_class == SDP_SERVICE_CLASS_NAP) { 364 sdp_put_uint16(&buf, SDP_ATTR_NET_ACCESS_TYPE); 365 sdp_put_uint16(&buf, 0x0004); /* 10Mb Ethernet */ 366 367 sdp_put_uint16(&buf, SDP_ATTR_MAX_NET_ACCESS_RATE); 368 sdp_put_uint32(&buf, IF_Mbps(10) / 8); /* octets/second */ 369 } 370 371 if (service_class == SDP_SERVICE_CLASS_NAP 372 || service_class == SDP_SERVICE_CLASS_GN) { 373 if (server_ipv4_subnet) { 374 sdp_put_uint16(&buf, SDP_ATTR_IPV4_SUBNET); 375 sdp_put_str(&buf, server_ipv4_subnet, -1); 376 } 377 378 if (server_ipv6_subnet) { 379 sdp_put_uint16(&buf, SDP_ATTR_IPV6_SUBNET); 380 sdp_put_str(&buf, server_ipv6_subnet, -1); 381 } 382 } 383 384 server_record.next = data; 385 server_record.end = buf.next; 386 } 387