rbootd.c revision 1.21
1 /* $NetBSD: rbootd.c,v 1.21 2008/07/21 13:36:59 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Center for Software Science of the University of Utah Computer 9 * Science Department. CSS requests users of this software to return 10 * to css-dist (at) cs.utah.edu any improvements that they make and grant 11 * CSS redistribution rights. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93 38 * 39 * From: Utah Hdr: rbootd.c 3.1 92/07/06 40 * Author: Jeff Forys, University of Utah CSS 41 */ 42 43 /* 44 * Copyright (c) 1988, 1992 The University of Utah and the Center 45 * for Software Science (CSS). 46 * 47 * This code is derived from software contributed to Berkeley by 48 * the Center for Software Science of the University of Utah Computer 49 * Science Department. CSS requests users of this software to return 50 * to css-dist (at) cs.utah.edu any improvements that they make and grant 51 * CSS redistribution rights. 52 * 53 * Redistribution and use in source and binary forms, with or without 54 * modification, are permitted provided that the following conditions 55 * are met: 56 * 1. Redistributions of source code must retain the above copyright 57 * notice, this list of conditions and the following disclaimer. 58 * 2. Redistributions in binary form must reproduce the above copyright 59 * notice, this list of conditions and the following disclaimer in the 60 * documentation and/or other materials provided with the distribution. 61 * 3. All advertising materials mentioning features or use of this software 62 * must display the following acknowledgement: 63 * This product includes software developed by the University of 64 * California, Berkeley and its contributors. 65 * 4. Neither the name of the University nor the names of its contributors 66 * may be used to endorse or promote products derived from this software 67 * without specific prior written permission. 68 * 69 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 70 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 71 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 72 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 73 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 74 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 75 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 76 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 77 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 78 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 79 * SUCH DAMAGE. 80 * 81 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93 82 * 83 * From: Utah Hdr: rbootd.c 3.1 92/07/06 84 * Author: Jeff Forys, University of Utah CSS 85 */ 86 87 #include <sys/cdefs.h> 88 #ifndef lint 89 __COPYRIGHT("@(#) Copyright (c) 1992, 1993\ 90 The Regents of the University of California. All rights reserved."); 91 #endif /* not lint */ 92 93 #ifndef lint 94 #if 0 95 static char sccsid[] = "@(#)rbootd.c 8.1 (Berkeley) 6/4/93"; 96 #else 97 __RCSID("$NetBSD: rbootd.c,v 1.21 2008/07/21 13:36:59 lukem Exp $"); 98 #endif 99 #endif /* not lint */ 100 101 #include <sys/param.h> 102 #include <sys/time.h> 103 #include <poll.h> 104 #include <err.h> 105 #include <errno.h> 106 #include <fcntl.h> 107 #include <signal.h> 108 #include <stdio.h> 109 #include <stdlib.h> 110 #include <string.h> 111 #include <syslog.h> 112 #include <unistd.h> 113 #include <util.h> 114 #include "defs.h" 115 116 int main (int, char *[]); 117 118 int 119 main(int argc, char *argv[]) 120 { 121 int c, fd, omask; 122 struct pollfd set[1]; 123 124 /* 125 * Close any open file descriptors. 126 * Temporarily leave stdin & stdout open for `-d', 127 * and stderr open for any pre-syslog error messages. 128 */ 129 { 130 int i, nfds = getdtablesize(); 131 132 for (i = 0; i < nfds; i++) 133 if (i != STDIN_FILENO && i != STDOUT_FILENO && 134 i != STDERR_FILENO) 135 (void) close(i); 136 } 137 138 /* 139 * Parse any arguments. 140 */ 141 while ((c = getopt(argc, argv, "adi:")) != -1) 142 switch(c) { 143 case 'a': 144 BootAny++; 145 break; 146 case 'd': 147 DebugFlg++; 148 break; 149 case 'i': 150 IntfName = optarg; 151 break; 152 } 153 for (; optind < argc; optind++) { 154 if (ConfigFile == NULL) 155 ConfigFile = argv[optind]; 156 else { 157 warnx("too many config files (`%s' ignored)", 158 argv[optind]); 159 } 160 } 161 162 if (ConfigFile == NULL) /* use default config file */ 163 ConfigFile = DfltConfig; 164 165 if (DebugFlg) { 166 DbgFp = stdout; /* output to stdout */ 167 168 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 169 (void) signal(SIGUSR2, SIG_IGN); 170 (void) fclose(stderr); /* finished with it */ 171 } else { 172 if (daemon(0, 0)) 173 err(1, "can't detach from terminal"); 174 pidfile(NULL); 175 176 (void) signal(SIGUSR1, DebugOn); 177 (void) signal(SIGUSR2, DebugOff); 178 } 179 180 openlog("rbootd", LOG_PID, LOG_DAEMON); 181 182 /* 183 * If no interface was specified, get one now. 184 * 185 * This is convoluted because we want to get the default interface 186 * name for the syslog("restarted") message. If BpfGetIntfName() 187 * runs into an error, it will return a syslog-able error message 188 * (in `errmsg') which will be displayed here. 189 */ 190 if (IntfName == NULL) { 191 char *errmsg; 192 193 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 194 /* backslash to avoid trigraph ??) */ 195 syslog(LOG_NOTICE, "restarted (?\?)"); 196 syslog(LOG_ERR, errmsg); 197 Exit(0); 198 } 199 } 200 201 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 202 203 (void) signal(SIGHUP, ReConfig); 204 (void) signal(SIGINT, Exit); 205 (void) signal(SIGTERM, Exit); 206 207 /* 208 * Grab our host name and pid. 209 */ 210 if (gethostname(MyHost, sizeof MyHost) < 0) { 211 syslog(LOG_ERR, "gethostname: %m"); 212 Exit(0); 213 } 214 MyHost[sizeof(MyHost) - 1] = '\0'; 215 216 /* 217 * All boot files are relative to the boot directory, we might 218 * as well chdir() there to make life easier. 219 */ 220 if (chdir(BootDir) < 0) { 221 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 222 Exit(0); 223 } 224 225 /* 226 * Initial configuration. 227 */ 228 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 229 if (GetBootFiles() == 0) /* get list of boot files */ 230 Exit(0); 231 if (ParseConfig() == 0) /* parse config file */ 232 Exit(0); 233 234 /* 235 * Open and initialize a BPF device for the appropriate interface. 236 * If an error is encountered, a message is displayed and Exit() 237 * is called. 238 */ 239 fd = BpfOpen(); 240 241 (void) sigsetmask(omask); /* allow reconfig's */ 242 243 /* 244 * Main loop: receive a packet, determine where it came from, 245 * and if we service this host, call routine to handle request. 246 */ 247 set[0].fd = fd; 248 set[0].events = POLLIN; 249 for (;;) { 250 int nsel; 251 252 nsel = poll(set, 1, RmpConns ? RMP_TIMEOUT * 1000 : INFTIM); 253 254 if (nsel < 0) { 255 if (errno == EINTR) 256 continue; 257 syslog(LOG_ERR, "poll: %m"); 258 Exit(0); 259 } else if (nsel == 0) { /* timeout */ 260 DoTimeout(); /* clear stale conns */ 261 continue; 262 } 263 264 if (set[0].revents & POLLIN) { 265 RMPCONN rconn; 266 CLIENT *client; 267 int doread = 1; 268 269 while (BpfRead(&rconn, doread)) { 270 doread = 0; 271 272 if (DbgFp != NULL) /* display packet */ 273 DispPkt(&rconn,DIR_RCVD); 274 275 omask = sigblock(sigmask(SIGHUP)); 276 277 /* 278 * If we do not restrict service, set the 279 * client to NULL (ProcessPacket() handles 280 * this). Otherwise, check that we can 281 * service this host; if not, log a message 282 * and ignore the packet. 283 */ 284 if (BootAny) { 285 client = NULL; 286 } else if ((client=FindClient(&rconn))==NULL) { 287 syslog(LOG_INFO, 288 "%s: boot packet ignored", 289 EnetStr(&rconn)); 290 (void) sigsetmask(omask); 291 continue; 292 } 293 294 ProcessPacket(&rconn,client); 295 296 (void) sigsetmask(omask); 297 } 298 } 299 } 300 } 301 302 /* 303 ** DoTimeout -- Free any connections that have timed out. 304 ** 305 ** Parameters: 306 ** None. 307 ** 308 ** Returns: 309 ** Nothing. 310 ** 311 ** Side Effects: 312 ** - Timed out connections in `RmpConns' will be freed. 313 */ 314 void 315 DoTimeout(void) 316 { 317 RMPCONN *rtmp; 318 struct timeval now; 319 320 (void) gettimeofday(&now, (struct timezone *)0); 321 322 /* 323 * For each active connection, if RMP_TIMEOUT seconds have passed 324 * since the last packet was sent, delete the connection. 325 */ 326 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 327 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 328 syslog(LOG_WARNING, "%s: connection timed out (%u)", 329 EnetStr(rtmp), rtmp->rmp.r_type); 330 RemoveConn(rtmp); 331 } 332 } 333 334 /* 335 ** FindClient -- Find client associated with a packet. 336 ** 337 ** Parameters: 338 ** rconn - the new packet. 339 ** 340 ** Returns: 341 ** Pointer to client info if found, NULL otherwise. 342 ** 343 ** Side Effects: 344 ** None. 345 ** 346 ** Warnings: 347 ** - This routine must be called with SIGHUP blocked since 348 ** a reconfigure can invalidate the information returned. 349 */ 350 351 CLIENT * 352 FindClient(RMPCONN *rconn) 353 { 354 CLIENT *ctmp; 355 356 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 357 if (memcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 358 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 359 break; 360 361 return(ctmp); 362 } 363 364 /* 365 ** Exit -- Log an error message and exit. 366 ** 367 ** Parameters: 368 ** sig - caught signal (or zero if not dying on a signal). 369 ** 370 ** Returns: 371 ** Does not return. 372 ** 373 ** Side Effects: 374 ** - This process ceases to exist. 375 */ 376 void 377 Exit(int sig) 378 { 379 if (sig > 0) 380 syslog(LOG_ERR, "going down on signal %d", sig); 381 else 382 syslog(LOG_ERR, "going down with fatal error"); 383 BpfClose(); 384 exit(1); 385 } 386 387 /* 388 ** ReConfig -- Get new list of boot files and reread config files. 389 ** 390 ** Parameters: 391 ** None. 392 ** 393 ** Returns: 394 ** Nothing. 395 ** 396 ** Side Effects: 397 ** - All active connections are dropped. 398 ** - List of boot-able files is changed. 399 ** - List of clients is changed. 400 ** 401 ** Warnings: 402 ** - This routine must be called with SIGHUP blocked. 403 */ 404 void 405 ReConfig(int signo) 406 { 407 syslog(LOG_NOTICE, "reconfiguring boot server"); 408 409 FreeConns(); 410 411 if (GetBootFiles() == 0) 412 Exit(0); 413 414 if (ParseConfig() == 0) 415 Exit(0); 416 } 417 418 /* 419 ** DebugOff -- Turn off debugging. 420 ** 421 ** Parameters: 422 ** None. 423 ** 424 ** Returns: 425 ** Nothing. 426 ** 427 ** Side Effects: 428 ** - Debug file is closed. 429 */ 430 void 431 DebugOff(int signo) 432 { 433 if (DbgFp != NULL) 434 (void) fclose(DbgFp); 435 436 DbgFp = NULL; 437 } 438 439 /* 440 ** DebugOn -- Turn on debugging. 441 ** 442 ** Parameters: 443 ** None. 444 ** 445 ** Returns: 446 ** Nothing. 447 ** 448 ** Side Effects: 449 ** - Debug file is opened/truncated if not already opened, 450 ** otherwise do nothing. 451 */ 452 void 453 DebugOn(int signo) 454 { 455 if (DbgFp == NULL) { 456 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 457 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 458 } 459 } 460
Indexes created Tue Sep 23 07:09:52 GMT 2025