server.c revision 1.3
1 /* $NetBSD: server.c,v 1.3 2009/05/12 21:08:30 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 1.3 2009/05/12 21:08:30 plunky Exp $"); 30 31 #include <sys/ioctl.h> 32 33 #include <bluetooth.h> 34 #include <errno.h> 35 #include <sdp.h> 36 #include <unistd.h> 37 38 #include "btpand.h" 39 #include "bnep.h" 40 41 static struct event server_ev; 42 static int server_count; 43 44 static void * server_ss; 45 static uint32_t server_handle; 46 47 static void server_open(void); 48 static void server_read(int, short, void *); 49 static void server_down(channel_t *); 50 static void server_update(void); 51 52 void 53 server_init(void) 54 { 55 56 if (server_limit == 0) 57 return; 58 59 server_open(); 60 server_update(); 61 } 62 63 /* 64 * Start listening on server socket 65 */ 66 static void 67 server_open(void) 68 { 69 struct sockaddr_bt sa; 70 uint16_t mru; 71 int fd; 72 73 fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); 74 if (fd == -1) { 75 log_err("Could not open L2CAP socket: %m"); 76 exit(EXIT_FAILURE); 77 } 78 79 memset(&sa, 0, sizeof(sa)); 80 sa.bt_family = AF_BLUETOOTH; 81 sa.bt_len = sizeof(sa); 82 sa.bt_psm = l2cap_psm; 83 bdaddr_copy(&sa.bt_bdaddr, &local_bdaddr); 84 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 85 log_err("Could not bind server socket: %m"); 86 exit(EXIT_FAILURE); 87 } 88 89 if (setsockopt(fd, BTPROTO_L2CAP, 90 SO_L2CAP_LM, &l2cap_mode, sizeof(l2cap_mode)) == -1) { 91 log_err("Could not set link mode (0x%4.4x): %m", l2cap_mode); 92 exit(EXIT_FAILURE); 93 } 94 95 mru = BNEP_MTU_MIN; 96 if (setsockopt(fd, BTPROTO_L2CAP, 97 SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) { 98 log_err("Could not set L2CAP IMTU (%d): %m", mru); 99 exit(EXIT_FAILURE); 100 } 101 102 if (listen(fd, 0) == -1) { 103 log_err("Could not listen on server socket: %m"); 104 exit(EXIT_FAILURE); 105 } 106 107 event_set(&server_ev, fd, EV_READ | EV_PERSIST, server_read, NULL); 108 if (event_add(&server_ev, NULL) == -1) { 109 log_err("Could not add server event: %m"); 110 exit(EXIT_FAILURE); 111 } 112 113 log_info("server socket open"); 114 } 115 116 /* 117 * handle connection request 118 */ 119 static void 120 server_read(int s, short ev, void *arg) 121 { 122 struct sockaddr_bt ra, la; 123 channel_t *chan; 124 socklen_t len; 125 int fd, n; 126 uint16_t mru, mtu; 127 128 assert(server_count < server_limit); 129 130 len = sizeof(ra); 131 fd = accept(s, (struct sockaddr *)&ra, &len); 132 if (fd == -1) 133 return; 134 135 n = 1; 136 if (ioctl(fd, FIONBIO, &n) == -1) { 137 log_err("Could not set NonBlocking IO: %m"); 138 close(fd); 139 return; 140 } 141 142 len = sizeof(mru); 143 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) { 144 log_err("Could not get L2CAP IMTU: %m"); 145 close(fd); 146 return; 147 } 148 if(mru < BNEP_MTU_MIN) { 149 log_err("L2CAP IMTU too small (%d)", mru); 150 close(fd); 151 return; 152 } 153 154 len = sizeof(mtu); 155 if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 156 log_err("Could not get L2CAP OMTU: %m"); 157 close(fd); 158 return; 159 } 160 if (mtu < BNEP_MTU_MIN) { 161 log_err("L2CAP OMTU too small (%d)", mtu); 162 close(fd); 163 return; 164 } 165 166 len = sizeof(n); 167 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) { 168 log_err("Could not get socket send buffer size: %m"); 169 close(fd); 170 return; 171 } 172 173 if (n < (mtu * 2)) { 174 n = mtu * 2; 175 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) { 176 log_err("Could not set socket send buffer size (%d): %m", n); 177 close(fd); 178 return; 179 } 180 } 181 182 n = mtu; 183 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) { 184 log_err("Could not set socket low water mark (%d): %m", n); 185 close(fd); 186 return; 187 } 188 189 len = sizeof(la); 190 if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) { 191 log_err("Could not get socket address: %m"); 192 close(fd); 193 return; 194 } 195 196 log_info("Accepted connection from %s", bt_ntoa(&ra.bt_bdaddr, NULL)); 197 198 chan = channel_alloc(); 199 if (chan == NULL) { 200 close(fd); 201 return; 202 } 203 204 chan->send = bnep_send; 205 chan->recv = bnep_recv; 206 chan->down = server_down; 207 chan->mru = mru; 208 chan->mtu = mtu; 209 b2eaddr(chan->raddr, &ra.bt_bdaddr); 210 b2eaddr(chan->laddr, &la.bt_bdaddr); 211 chan->state = CHANNEL_WAIT_CONNECT_REQ; 212 channel_timeout(chan, 10); 213 if (!channel_open(chan, fd)) { 214 chan->state = CHANNEL_CLOSED; 215 channel_free(chan); 216 close(fd); 217 return; 218 } 219 220 if (++server_count == server_limit) { 221 log_info("Server limit reached, closing server socket"); 222 event_del(&server_ev); 223 close(s); 224 } 225 226 server_update(); 227 } 228 229 /* 230 * Shut down a server channel, we need to update the service record and 231 * may want to restart accepting connections on the server socket 232 */ 233 static void 234 server_down(channel_t *chan) 235 { 236 237 assert(server_count > 0); 238 239 channel_close(chan); 240 241 if (server_count-- == server_limit) 242 server_open(); 243 244 server_update(); 245 } 246 247 static void 248 server_update(void) 249 { 250 sdp_nap_profile_t p; 251 int rv; 252 253 if (service_name == NULL) 254 return; 255 256 if (server_ss == NULL) { 257 server_ss = sdp_open_local(control_path); 258 if (server_ss == NULL || sdp_error(server_ss) != 0) { 259 log_err("failed to contact SDP server"); 260 return; 261 } 262 } 263 264 memset(&p, 0, sizeof(p)); 265 p.psm = l2cap_psm; 266 p.load_factor = (UINT8_MAX - server_count * UINT8_MAX / server_limit); 267 p.security_description = (l2cap_mode == 0 ? 0x0000 : 0x0001); 268 269 if (server_handle) 270 rv = sdp_change_service(server_ss, server_handle, 271 (uint8_t *)&p, sizeof(p)); 272 else 273 rv = sdp_register_service(server_ss, service_class, 274 &local_bdaddr, (uint8_t *)&p, sizeof(p), &server_handle); 275 276 if (rv != 0) { 277 errno = sdp_error(server_ss); 278 log_err("%s: %m", service_name); 279 exit(EXIT_FAILURE); 280 } 281 } 282
Indexes created Wed Sep 24 05:09:52 GMT 2025