1 /* $NetBSD: server.c,v 1.2 2009/01/24 17:29:28 plunky Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 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 /* $FreeBSD$ */ 29 30 #include <sys/cdefs.h> 31 __RCSID("$NetBSD: server.c,v 1.2 2009/01/24 17:29:28 plunky Exp $"); 32 33 #include <sys/ioctl.h> 34 35 #define L2CAP_SOCKET_CHECKED 36 #include <bluetooth.h> 37 #include <inttypes.h> 38 #include <errno.h> 39 #include <sdp.h> 40 #include <unistd.h> 41 42 #include "btpand.h" 43 #include "bnep.h" 44 45 static struct event server_ev; 46 static int server_fd; 47 static int server_avail; 48 49 static void * server_ss; 50 static uint32_t server_handle; 51 52 static void server_open(void); 53 static void server_close(void); 54 static void server_read(int, short, void *); 55 static void server_register(void); 56 57 void 58 server_init(void) 59 { 60 61 server_fd = -1; 62 } 63 64 /* 65 * The server_update() function is called whenever the channel count is 66 * changed. We maintain the SDP record and open or close the server socket 67 * as required. 68 */ 69 void 70 server_update(int count) 71 { 72 73 if (server_limit == 0) 74 return; 75 76 log_debug("count %d", count); 77 78 server_avail = UINT8_MAX - (count - 1) * UINT8_MAX / server_limit; 79 log_info("Service Availability: %d/%d", server_avail, UINT8_MAX); 80 81 if (server_avail == 0 && server_fd != -1) 82 server_close(); 83 84 if (server_avail > 0 && server_fd == -1) 85 server_open(); 86 87 if (service_name) 88 server_register(); 89 } 90 91 static void 92 server_open(void) 93 { 94 struct sockaddr_l2cap sa; 95 uint16_t mru; 96 97 server_fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP); 98 if (server_fd == -1) { 99 log_err("Could not open L2CAP socket: %m"); 100 exit(EXIT_FAILURE); 101 } 102 103 memset(&sa, 0, sizeof(sa)); 104 sa.l2cap_family = AF_BLUETOOTH; 105 sa.l2cap_len = sizeof(sa); 106 sa.l2cap_psm = htole16(l2cap_psm); 107 sa.l2cap_bdaddr_type = BDADDR_BREDR; 108 sa.l2cap_cid = 0; 109 110 bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr); 111 if (bind(server_fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 112 log_err("Could not bind server socket: %m"); 113 exit(EXIT_FAILURE); 114 } 115 116 mru = BNEP_MTU_MIN; 117 if (setsockopt(server_fd, SOL_L2CAP, 118 SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) { 119 log_err("Could not set L2CAP IMTU (%d): %m", mru); 120 exit(EXIT_FAILURE); 121 } 122 123 if (listen(server_fd, 0) == -1) { 124 log_err("Could not listen on server socket: %m"); 125 exit(EXIT_FAILURE); 126 } 127 128 event_set(&server_ev, server_fd, EV_READ | EV_PERSIST, server_read, NULL); 129 if (event_add(&server_ev, NULL) == -1) { 130 log_err("Could not add server event: %m"); 131 exit(EXIT_FAILURE); 132 } 133 134 log_info("server socket open"); 135 } 136 137 static void 138 server_close(void) 139 { 140 141 event_del(&server_ev); 142 close(server_fd); 143 server_fd = -1; 144 145 log_info("server socket closed"); 146 } 147 148 /* 149 * handle connection request 150 */ 151 static void 152 server_read(int s, short ev, void *arg) 153 { 154 struct sockaddr_l2cap ra, la; 155 channel_t *chan; 156 socklen_t len; 157 int fd, n; 158 uint16_t mru, mtu; 159 160 len = sizeof(ra); 161 fd = accept(s, (struct sockaddr *)&ra, &len); 162 if (fd == -1) 163 return; 164 165 n = 1; 166 if (ioctl(fd, FIONBIO, &n) == -1) { 167 log_err("Could not set NonBlocking IO: %m"); 168 close(fd); 169 return; 170 } 171 172 len = sizeof(mru); 173 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) { 174 log_err("Could not get L2CAP IMTU: %m"); 175 close(fd); 176 return; 177 } 178 if(mru < BNEP_MTU_MIN) { 179 log_err("L2CAP IMTU too small (%d)", mru); 180 close(fd); 181 return; 182 } 183 184 len = sizeof(n); 185 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) { 186 log_err("Could not read SO_RCVBUF"); 187 close(fd); 188 return; 189 } 190 if (n < (mru * 10)) { 191 n = mru * 10; 192 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1) 193 log_info("Could not increase SO_RCVBUF (from %d)", n); 194 } 195 196 len = sizeof(mtu); 197 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 198 log_err("Could not get L2CAP OMTU: %m"); 199 close(fd); 200 return; 201 } 202 if (mtu < BNEP_MTU_MIN) { 203 log_err("L2CAP OMTU too small (%d)", mtu); 204 close(fd); 205 return; 206 } 207 208 len = sizeof(n); 209 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) { 210 log_err("Could not get socket send buffer size: %m"); 211 close(fd); 212 return; 213 } 214 215 if (n < (mtu * 2)) { 216 n = mtu * 2; 217 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) { 218 log_err("Could not set socket send buffer size (%d): %m", n); 219 close(fd); 220 return; 221 } 222 } 223 224 n = mtu; 225 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) { 226 log_err("Could not set socket low water mark (%d): %m", n); 227 close(fd); 228 return; 229 } 230 231 len = sizeof(la); 232 if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) { 233 log_err("Could not get socket address: %m"); 234 close(fd); 235 return; 236 } 237 238 log_info("Accepted connection from %s", bt_ntoa(&ra.l2cap_bdaddr, NULL)); 239 240 chan = channel_alloc(); 241 if (chan == NULL) { 242 close(fd); 243 return; 244 } 245 246 chan->send = bnep_send; 247 chan->recv = bnep_recv; 248 chan->mru = mru; 249 chan->mtu = mtu; 250 b2eaddr(chan->raddr, &ra.l2cap_bdaddr); 251 b2eaddr(chan->laddr, &la.l2cap_bdaddr); 252 chan->state = CHANNEL_WAIT_CONNECT_REQ; 253 channel_timeout(chan, 10); 254 if (!channel_open(chan, fd)) { 255 chan->state = CHANNEL_CLOSED; 256 channel_free(chan); 257 close(fd); 258 return; 259 } 260 } 261 262 static void 263 server_register(void) 264 { 265 sdp_nap_profile_t p; 266 int rv; 267 268 if (server_ss == NULL) { 269 server_ss = sdp_open_local(control_path); 270 if (server_ss == NULL || sdp_error(server_ss) != 0) { 271 log_err("failed to contact SDP server"); 272 return; 273 } 274 } 275 276 memset(&p, 0, sizeof(p)); 277 p.psm = l2cap_psm; 278 p.load_factor = server_avail; 279 p.security_description = (l2cap_mode == 0 ? 0x0000 : 0x0001); 280 281 if (server_handle) 282 rv = sdp_change_service(server_ss, server_handle, 283 (uint8_t *)&p, sizeof(p)); 284 else 285 rv = sdp_register_service(server_ss, service_class, 286 &local_bdaddr, (uint8_t *)&p, sizeof(p), &server_handle); 287 288 if (rv != 0) { 289 errno = sdp_error(server_ss); 290 log_err("%s: %m", service_name); 291 exit(EXIT_FAILURE); 292 } 293 } 294