server.c revision 1.5
1 /* $NetBSD: server.c,v 1.5 2009/10/24 20:06:42 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 1.5 2009/10/24 20:06:42 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 uint16_t mru; 80 int fd; 81 82 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); 83 if (fd == -1) { 84 log_err("Could not open L2CAP socket: %m"); 85 exit(EXIT_FAILURE); 86 } 87 88 memset(&sa, 0, sizeof(sa)); 89 sa.bt_family = AF_BLUETOOTH; 90 sa.bt_len = sizeof(sa); 91 sa.bt_psm = l2cap_psm; 92 bdaddr_copy(&sa.bt_bdaddr, &local_bdaddr); 93 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 94 log_err("Could not bind server socket: %m"); 95 exit(EXIT_FAILURE); 96 } 97 98 if (setsockopt(fd, BTPROTO_L2CAP, 99 SO_L2CAP_LM, &l2cap_mode, sizeof(l2cap_mode)) == -1) { 100 log_err("Could not set link mode (0x%4.4x): %m", l2cap_mode); 101 exit(EXIT_FAILURE); 102 } 103 104 mru = BNEP_MTU_MIN; 105 if (setsockopt(fd, BTPROTO_L2CAP, 106 SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) { 107 log_err("Could not set L2CAP IMTU (%d): %m", mru); 108 exit(EXIT_FAILURE); 109 } 110 111 if (listen(fd, 0) == -1) { 112 log_err("Could not listen on server socket: %m"); 113 exit(EXIT_FAILURE); 114 } 115 116 event_set(&server_ev, fd, EV_READ | EV_PERSIST, server_read, NULL); 117 if (event_add(&server_ev, NULL) == -1) { 118 log_err("Could not add server event: %m"); 119 exit(EXIT_FAILURE); 120 } 121 122 log_info("server socket open"); 123 } 124 125 /* 126 * handle connection request 127 */ 128 static void 129 server_read(int s, short ev, void *arg) 130 { 131 struct sockaddr_bt ra, la; 132 channel_t *chan; 133 socklen_t len; 134 int fd, n; 135 uint16_t mru, mtu; 136 137 assert(server_count < server_limit); 138 139 len = sizeof(ra); 140 fd = accept(s, (struct sockaddr *)&ra, &len); 141 if (fd == -1) 142 return; 143 144 n = 1; 145 if (ioctl(fd, FIONBIO, &n) == -1) { 146 log_err("Could not set NonBlocking IO: %m"); 147 close(fd); 148 return; 149 } 150 151 len = sizeof(mru); 152 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) { 153 log_err("Could not get L2CAP IMTU: %m"); 154 close(fd); 155 return; 156 } 157 if(mru < BNEP_MTU_MIN) { 158 log_err("L2CAP IMTU too small (%d)", mru); 159 close(fd); 160 return; 161 } 162 163 len = sizeof(mtu); 164 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 165 log_err("Could not get L2CAP OMTU: %m"); 166 close(fd); 167 return; 168 } 169 if (mtu < BNEP_MTU_MIN) { 170 log_err("L2CAP OMTU too small (%d)", mtu); 171 close(fd); 172 return; 173 } 174 175 len = sizeof(n); 176 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) { 177 log_err("Could not get socket send buffer size: %m"); 178 close(fd); 179 return; 180 } 181 182 if (n < (mtu * 2)) { 183 n = mtu * 2; 184 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) { 185 log_err("Could not set socket send buffer size (%d): %m", n); 186 close(fd); 187 return; 188 } 189 } 190 191 n = mtu; 192 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) { 193 log_err("Could not set socket low water mark (%d): %m", n); 194 close(fd); 195 return; 196 } 197 198 len = sizeof(la); 199 if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) { 200 log_err("Could not get socket address: %m"); 201 close(fd); 202 return; 203 } 204 205 log_info("Accepted connection from %s", bt_ntoa(&ra.bt_bdaddr, NULL)); 206 207 chan = channel_alloc(); 208 if (chan == NULL) { 209 close(fd); 210 return; 211 } 212 213 chan->send = bnep_send; 214 chan->recv = bnep_recv; 215 chan->down = server_down; 216 chan->mru = mru; 217 chan->mtu = mtu; 218 b2eaddr(chan->raddr, &ra.bt_bdaddr); 219 b2eaddr(chan->laddr, &la.bt_bdaddr); 220 chan->state = CHANNEL_WAIT_CONNECT_REQ; 221 channel_timeout(chan, 10); 222 if (!channel_open(chan, fd)) { 223 chan->state = CHANNEL_CLOSED; 224 channel_free(chan); 225 close(fd); 226 return; 227 } 228 229 if (++server_count == server_limit) { 230 log_info("Server limit reached, closing server socket"); 231 event_del(&server_ev); 232 close(s); 233 } 234 235 server_update(); 236 } 237 238 /* 239 * Shut down a server channel, we need to update the service record and 240 * may want to restart accepting connections on the server socket 241 */ 242 static void 243 server_down(channel_t *chan) 244 { 245 246 assert(server_count > 0); 247 248 channel_close(chan); 249 250 if (server_count-- == server_limit) 251 server_open(); 252 253 server_update(); 254 } 255 256 static void 257 server_update(void) 258 { 259 bool rv; 260 261 if (service_type == NULL) 262 return; 263 264 if (server_ss == NULL) { 265 server_ss = sdp_open_local(control_path); 266 if (server_ss == NULL) { 267 log_err("failed to contact SDP server"); 268 return; 269 } 270 } 271 272 server_mkrecord(); 273 274 if (server_handle == 0) 275 rv = sdp_record_insert(server_ss, &local_bdaddr, 276 &server_handle, &server_record); 277 else 278 rv = sdp_record_update(server_ss, server_handle, 279 &server_record); 280 281 if (!rv) { 282 log_err("%s: %m", service_type); 283 exit(EXIT_FAILURE); 284 } 285 } 286 287 static void 288 server_mkrecord(void) 289 { 290 static uint8_t data[256]; /* tis enough */ 291 sdp_data_t buf; 292 size_t i; 293 294 buf.next = data; 295 buf.end = data + sizeof(data); 296 297 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_RECORD_HANDLE); 298 sdp_put_uint32(&buf, 0x00000000); 299 300 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_CLASS_ID_LIST); 301 sdp_put_seq(&buf, 3); 302 sdp_put_uuid16(&buf, service_class); 303 304 sdp_put_uint16(&buf, SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST); 305 sdp_put_seq(&buf, 8 + 10 + 3 * server_nproto); 306 sdp_put_seq(&buf, 6); 307 sdp_put_uuid16(&buf, SDP_UUID_PROTOCOL_L2CAP); 308 sdp_put_uint16(&buf, l2cap_psm); 309 sdp_put_seq(&buf, 8 + 3 * server_nproto); 310 sdp_put_uuid16(&buf, SDP_UUID_PROTOCOL_BNEP); 311 sdp_put_uint16(&buf, 0x0100); /* v1.0 */ 312 sdp_put_seq(&buf, 3 * server_nproto); 313 for (i = 0; i < server_nproto; i++) 314 sdp_put_uint16(&buf, server_proto[i]); 315 316 sdp_put_uint16(&buf, SDP_ATTR_BROWSE_GROUP_LIST); 317 sdp_put_seq(&buf, 3); 318 sdp_put_uuid16(&buf, SDP_SERVICE_CLASS_PUBLIC_BROWSE_GROUP); 319 320 sdp_put_uint16(&buf, SDP_ATTR_LANGUAGE_BASE_ATTRIBUTE_ID_LIST); 321 sdp_put_seq(&buf, 9); 322 sdp_put_uint16(&buf, 0x656e); /* "en" */ 323 sdp_put_uint16(&buf, 106); /* UTF-8 */ 324 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID); 325 326 sdp_put_uint16(&buf, SDP_ATTR_SERVICE_AVAILABILITY); 327 sdp_put_uint8(&buf, (UINT8_MAX - server_count * UINT8_MAX / server_limit)); 328 329 sdp_put_uint16(&buf, SDP_ATTR_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 330 sdp_put_seq(&buf, 8); 331 sdp_put_seq(&buf, 6); 332 sdp_put_uuid16(&buf, service_class); 333 sdp_put_uint16(&buf, 0x0100); /* v1.0 */ 334 335 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID 336 + SDP_ATTR_SERVICE_NAME_OFFSET); 337 sdp_put_str(&buf, service_name, -1); 338 339 sdp_put_uint16(&buf, SDP_ATTR_PRIMARY_LANGUAGE_BASE_ID 340 + SDP_ATTR_SERVICE_DESCRIPTION_OFFSET); 341 sdp_put_str(&buf, service_desc, -1); 342 343 sdp_put_uint16(&buf, SDP_ATTR_SECURITY_DESCRIPTION); 344 sdp_put_uint16(&buf, (l2cap_mode == 0) ? 0x0000 : 0x0001); 345 346 if (service_class == SDP_SERVICE_CLASS_NAP) { 347 sdp_put_uint16(&buf, SDP_ATTR_NET_ACCESS_TYPE); 348 sdp_put_uint16(&buf, 0x0004); /* 10Mb Ethernet */ 349 350 sdp_put_uint16(&buf, SDP_ATTR_MAX_NET_ACCESS_RATE); 351 sdp_put_uint32(&buf, IF_Mbps(10) / 8); /* octets/second */ 352 } 353 354 if (service_class == SDP_SERVICE_CLASS_NAP 355 || service_class == SDP_SERVICE_CLASS_GN) { 356 if (server_ipv4_subnet) { 357 sdp_put_uint16(&buf, SDP_ATTR_IPV4_SUBNET); 358 sdp_put_str(&buf, server_ipv4_subnet, -1); 359 } 360 361 if (server_ipv6_subnet) { 362 sdp_put_uint16(&buf, SDP_ATTR_IPV6_SUBNET); 363 sdp_put_str(&buf, server_ipv6_subnet, -1); 364 } 365 } 366 367 server_record.next = data; 368 server_record.end = buf.next; 369 } 370
Indexes created Tue Sep 23 14:10:03 GMT 2025