1 /* $NetBSD: server.c,v 1.2 2009/01/24 17:29:28 plunky Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2008 Iain Hibbert 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 /* $FreeBSD$ */ 31 32 #include <sys/cdefs.h> 33 __RCSID("$NetBSD: server.c,v 1.2 2009/01/24 17:29:28 plunky Exp $"); 34 35 #include <sys/ioctl.h> 36 37 #define L2CAP_SOCKET_CHECKED 38 #include <bluetooth.h> 39 #include <inttypes.h> 40 #include <errno.h> 41 #include <sdp.h> 42 #include <unistd.h> 43 44 #include "btpand.h" 45 #include "bnep.h" 46 47 static struct event server_ev; 48 static int server_fd; 49 static int server_avail; 50 51 static void * server_ss; 52 static uint32_t server_handle; 53 54 static void server_open(void); 55 static void server_close(void); 56 static void server_read(int, short, void *); 57 static void server_register(void); 58 59 void 60 server_init(void) 61 { 62 63 server_fd = -1; 64 } 65 66 /* 67 * The server_update() function is called whenever the channel count is 68 * changed. We maintain the SDP record and open or close the server socket 69 * as required. 70 */ 71 void 72 server_update(int count) 73 { 74 75 if (server_limit == 0) 76 return; 77 78 log_debug("count %d", count); 79 80 server_avail = UINT8_MAX - (count - 1) * UINT8_MAX / server_limit; 81 log_info("Service Availability: %d/%d", server_avail, UINT8_MAX); 82 83 if (server_avail == 0 && server_fd != -1) 84 server_close(); 85 86 if (server_avail > 0 && server_fd == -1) 87 server_open(); 88 89 if (service_name) 90 server_register(); 91 } 92 93 static void 94 server_open(void) 95 { 96 struct sockaddr_l2cap sa; 97 uint16_t mru; 98 99 server_fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BLUETOOTH_PROTO_L2CAP); 100 if (server_fd == -1) { 101 log_err("Could not open L2CAP socket: %m"); 102 exit(EXIT_FAILURE); 103 } 104 105 memset(&sa, 0, sizeof(sa)); 106 sa.l2cap_family = AF_BLUETOOTH; 107 sa.l2cap_len = sizeof(sa); 108 sa.l2cap_psm = htole16(l2cap_psm); 109 sa.l2cap_bdaddr_type = BDADDR_BREDR; 110 sa.l2cap_cid = 0; 111 112 bdaddr_copy(&sa.l2cap_bdaddr, &local_bdaddr); 113 if (bind(server_fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 114 log_err("Could not bind server socket: %m"); 115 exit(EXIT_FAILURE); 116 } 117 118 mru = BNEP_MTU_MIN; 119 if (setsockopt(server_fd, SOL_L2CAP, 120 SO_L2CAP_IMTU, &mru, sizeof(mru)) == -1) { 121 log_err("Could not set L2CAP IMTU (%d): %m", mru); 122 exit(EXIT_FAILURE); 123 } 124 125 if (listen(server_fd, 0) == -1) { 126 log_err("Could not listen on server socket: %m"); 127 exit(EXIT_FAILURE); 128 } 129 130 event_set(&server_ev, server_fd, EV_READ | EV_PERSIST, server_read, NULL); 131 if (event_add(&server_ev, NULL) == -1) { 132 log_err("Could not add server event: %m"); 133 exit(EXIT_FAILURE); 134 } 135 136 log_info("server socket open"); 137 } 138 139 static void 140 server_close(void) 141 { 142 143 event_del(&server_ev); 144 close(server_fd); 145 server_fd = -1; 146 147 log_info("server socket closed"); 148 } 149 150 /* 151 * handle connection request 152 */ 153 static void 154 server_read(int s, short ev, void *arg) 155 { 156 struct sockaddr_l2cap ra, la; 157 channel_t *chan; 158 socklen_t len; 159 int fd, n; 160 uint16_t mru, mtu; 161 162 len = sizeof(ra); 163 fd = accept(s, (struct sockaddr *)&ra, &len); 164 if (fd == -1) 165 return; 166 167 n = 1; 168 if (ioctl(fd, FIONBIO, &n) == -1) { 169 log_err("Could not set NonBlocking IO: %m"); 170 close(fd); 171 return; 172 } 173 174 len = sizeof(mru); 175 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) { 176 log_err("Could not get L2CAP IMTU: %m"); 177 close(fd); 178 return; 179 } 180 if(mru < BNEP_MTU_MIN) { 181 log_err("L2CAP IMTU too small (%d)", mru); 182 close(fd); 183 return; 184 } 185 186 len = sizeof(n); 187 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) { 188 log_err("Could not read SO_RCVBUF"); 189 close(fd); 190 return; 191 } 192 if (n < (mru * 10)) { 193 n = mru * 10; 194 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1) 195 log_info("Could not increase SO_RCVBUF (from %d)", n); 196 } 197 198 len = sizeof(mtu); 199 if (getsockopt(fd, SOL_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) { 200 log_err("Could not get L2CAP OMTU: %m"); 201 close(fd); 202 return; 203 } 204 if (mtu < BNEP_MTU_MIN) { 205 log_err("L2CAP OMTU too small (%d)", mtu); 206 close(fd); 207 return; 208 } 209 210 len = sizeof(n); 211 if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) { 212 log_err("Could not get socket send buffer size: %m"); 213 close(fd); 214 return; 215 } 216 217 if (n < (mtu * 2)) { 218 n = mtu * 2; 219 if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) { 220 log_err("Could not set socket send buffer size (%d): %m", n); 221 close(fd); 222 return; 223 } 224 } 225 226 n = mtu; 227 if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) { 228 log_err("Could not set socket low water mark (%d): %m", n); 229 close(fd); 230 return; 231 } 232 233 len = sizeof(la); 234 if (getsockname(fd, (struct sockaddr *)&la, &len) == -1) { 235 log_err("Could not get socket address: %m"); 236 close(fd); 237 return; 238 } 239 240 log_info("Accepted connection from %s", bt_ntoa(&ra.l2cap_bdaddr, NULL)); 241 242 chan = channel_alloc(); 243 if (chan == NULL) { 244 close(fd); 245 return; 246 } 247 248 chan->send = bnep_send; 249 chan->recv = bnep_recv; 250 chan->mru = mru; 251 chan->mtu = mtu; 252 b2eaddr(chan->raddr, &ra.l2cap_bdaddr); 253 b2eaddr(chan->laddr, &la.l2cap_bdaddr); 254 chan->state = CHANNEL_WAIT_CONNECT_REQ; 255 channel_timeout(chan, 10); 256 if (!channel_open(chan, fd)) { 257 chan->state = CHANNEL_CLOSED; 258 channel_free(chan); 259 close(fd); 260 return; 261 } 262 } 263 264 static void 265 server_register(void) 266 { 267 sdp_nap_profile_t p; 268 int rv; 269 270 if (server_ss == NULL) { 271 server_ss = sdp_open_local(control_path); 272 if (server_ss == NULL || sdp_error(server_ss) != 0) { 273 log_err("failed to contact SDP server"); 274 return; 275 } 276 } 277 278 memset(&p, 0, sizeof(p)); 279 p.psm = l2cap_psm; 280 p.load_factor = server_avail; 281 p.security_description = (l2cap_mode == 0 ? 0x0000 : 0x0001); 282 283 if (server_handle) 284 rv = sdp_change_service(server_ss, server_handle, 285 (uint8_t *)&p, sizeof(p)); 286 else 287 rv = sdp_register_service(server_ss, service_class, 288 &local_bdaddr, (uint8_t *)&p, sizeof(p), &server_handle); 289 290 if (rv != 0) { 291 errno = sdp_error(server_ss); 292 log_err("%s: %m", service_name); 293 exit(EXIT_FAILURE); 294 } 295 } 296