1 /* $NetBSD: server.c,v 1.8 2012/10/14 08:31:35 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 1.8 2012/10/14 08:31:35 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; 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(n); 167 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) { 168 log_err("Could not read SO_RCVBUF"); 169 close(fd); 170 return; 171 } 172 if (n < 10 * mru) { 173 n = 10 * mru; 174 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1) 175 log_info("Could not increase SO_RCVBUF (to %d)", n); 176 } 177 178 len = sizeof(mtu); 179 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 180 log_err("Could not get L2CAP OMTU: %m"); 181 close(fd); 182 return; 183 } 184 if (mtu < BNEP_MTU_MIN) { 185 log_err("L2CAP OMTU too small (%d)", mtu); 186 close(fd); 187 return; 188 } 189 190 len = sizeof(n); 191 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) { 192 log_err("Could not get socket send buffer size: %m"); 193 close(fd); 194 return; 195 } 196 if (n < (mtu * 2)) { 197 n = mtu * 2; 198 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) { 199 log_err("Could not set socket send buffer size (%d): %m", n); 200 close(fd); 201 return; 202 } 203 } 204 n = mtu; 205 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) { 206 log_err("Could not set socket low water mark (%d): %m", n); 207 close(fd); 208 return; 209 } 210 211 len = sizeof(la); 212 if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) { 213 log_err("Could not get socket address: %m"); 214 close(fd); 215 return; 216 } 217 218 log_info("Accepted connection from %s", bt_ntoa(&ra.bt_bdaddr, NULL)); 219 220 chan = channel_alloc(); 221 if (chan == NULL) { 222 close(fd); 223 return; 224 } 225 226 chan->send = bnep_send; 227 chan->recv = bnep_recv; 228 chan->down = server_down; 229 chan->mru = mru; 230 chan->mtu = mtu; 231 b2eaddr(chan->raddr, &ra.bt_bdaddr); 232 b2eaddr(chan->laddr, &la.bt_bdaddr); 233 chan->state = CHANNEL_WAIT_CONNECT_REQ; 234 channel_timeout(chan, 10); 235 if (!channel_open(chan, fd)) { 236 chan->state = CHANNEL_CLOSED; 237 channel_free(chan); 238 close(fd); 239 return; 240 } 241 242 if (++server_count == server_limit) { 243 log_info("Server limit reached, closing server socket"); 244 event_del(&server_ev); 245 close(s); 246 } 247 248 server_update(); 249 } 250 251 /* 252 * Shut down a server channel, we need to update the service record and 253 * may want to restart accepting connections on the server socket 254 */ 255 static void 256 server_down(channel_t *chan) 257 { 258 259 assert(server_count > 0); 260 261 channel_close(chan); 262 263 if (server_count-- == server_limit) 264 server_open(); 265 266 server_update(); 267 } 268 269 static void 270 server_update(void) 271 { 272 bool rv; 273 274 if (service_type == NULL) 275 return; 276 277 if (server_ss == NULL) { 278 server_ss = sdp_open_local(control_path); 279 if (server_ss == NULL) { 280 log_err("failed to contact SDP server"); 281 return; 282 } 283 } 284 285 server_mkrecord(); 286 287 if (server_handle == 0) 288 rv = sdp_record_insert(server_ss, &local_bdaddr, 289 &server_handle, &server_record); 290 else 291 rv = sdp_record_update(server_ss, server_handle, 292 &server_record); 293 294 if (!rv) { 295 log_err("%s: %m", service_type); 296 exit(EXIT_FAILURE); 297 } 298 } 299 300 static void 301 server_mkrecord(void) 302 { 303 static uint8_t data[256]; /* tis enough */ 304 sdp_data_t buf; 305 size_t i; 306 307 buf.next = data; 308 buf.end = data + sizeof(data); 309 310 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_RECORD_HANDLE); 311 sdp_put_uint32(&buf, 0x00000000); 312 313 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_CLASS_ID_LIST); 314 sdp_put_seq(&buf, 3); 315 sdp_put_uuid16(&buf, service_class); 316 317 sdp_put_uint16(&buf, SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST); 318 sdp_put_seq(&buf, 8 + 10 + 3 * server_nproto); 319 sdp_put_seq(&buf, 6); 320 sdp_put_uuid16(&buf, SDP_UUID_PROTOCOL_L2CAP); 321 sdp_put_uint16(&buf, l2cap_psm); 322 sdp_put_seq(&buf, 8 + 3 * server_nproto); 323 sdp_put_uuid16(&buf, SDP_UUID_PROTOCOL_BNEP); 324 sdp_put_uint16(&buf, 0x0100); /* v1.0 */ 325 sdp_put_seq(&buf, 3 * server_nproto); 326 for (i = 0; i < server_nproto; i++) 327 sdp_put_uint16(&buf, server_proto[i]); 328 329 sdp_put_uint16(&buf, SDP_ATTR_BROWSE_GROUP_LIST); 330 sdp_put_seq(&buf, 3); 331 sdp_put_uuid16(&buf, SDP_SERVICE_CLASS_PUBLIC_BROWSE_GROUP); 332 333 sdp_put_uint16(&buf, SDP_ATTR_LANGUAGE_BASE_ATTRIBUTE_ID_LIST); 334 sdp_put_seq(&buf, 9); 335 sdp_put_uint16(&buf, 0x656e); /* "en" */ 336 sdp_put_uint16(&buf, 106); /* UTF-8 */ 337 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID); 338 339 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_AVAILABILITY); 340 sdp_put_uint8(&buf, (UINT8_MAX - server_count * UINT8_MAX / server_limit)); 341 342 sdp_put_uint16(&buf, SDP_ATTR_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 343 sdp_put_seq(&buf, 8); 344 sdp_put_seq(&buf, 6); 345 sdp_put_uuid16(&buf, service_class); 346 sdp_put_uint16(&buf, 0x0100); /* v1.0 */ 347 348 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID 349 + SDP_ATTR_SERVICE_NAME_OFFSET); 350 sdp_put_str(&buf, service_name, -1); 351 352 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID 353 + SDP_ATTR_SERVICE_DESCRIPTION_OFFSET); 354 sdp_put_str(&buf, service_desc, -1); 355 356 sdp_put_uint16(&buf, SDP_ATTR_SECURITY_DESCRIPTION); 357 sdp_put_uint16(&buf, (l2cap_mode & L2CAP_LM_AUTH) ? 0x0001 : 0x0000); 358 359 if (service_class == SDP_SERVICE_CLASS_NAP) { 360 sdp_put_uint16(&buf, SDP_ATTR_NET_ACCESS_TYPE); 361 sdp_put_uint16(&buf, 0x0004); /* 10Mb Ethernet */ 362 363 sdp_put_uint16(&buf, SDP_ATTR_MAX_NET_ACCESS_RATE); 364 sdp_put_uint32(&buf, IF_Mbps(10) / 8); /* octets/second */ 365 } 366 367 if (service_class == SDP_SERVICE_CLASS_NAP 368 || service_class == SDP_SERVICE_CLASS_GN) { 369 if (server_ipv4_subnet) { 370 sdp_put_uint16(&buf, SDP_ATTR_IPV4_SUBNET); 371 sdp_put_str(&buf, server_ipv4_subnet, -1); 372 } 373 374 if (server_ipv6_subnet) { 375 sdp_put_uint16(&buf, SDP_ATTR_IPV6_SUBNET); 376 sdp_put_str(&buf, server_ipv6_subnet, -1); 377 } 378 } 379 380 server_record.next = data; 381 server_record.end = buf.next; 382 } 383
Indexes created Mon Sep 22 13:09:51 GMT 2025