1 /* 2 * Copyright (c) 1988, 1992 The University of Utah and the Center 3 * for Software Science (CSS). 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@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. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93 42 * 43 * From: Utah Hdr: rbootd.c 3.1 92/07/06 44 * Author: Jeff Forys, University of Utah CSS 45 */ 46 47 #ifndef lint 48 static const char copyright[] = 49 "@(#) Copyright (c) 1992, 1993\n\ 50 The Regents of the University of California. All rights reserved.\n"; 51 #endif /* not lint */ 52 53 #ifndef lint 54 #if 0 55 static const char sccsid[] = "@(#)rbootd.c 8.1 (Berkeley) 6/4/93"; 56 #endif 57 static const char rcsid[] = 58 "$FreeBSD$"; 59 #endif /* not lint */ 60 61 #include <sys/param.h> 62 #include <sys/time.h> 63 #include <ctype.h> 64 #include <err.h> 65 #include <errno.h> 66 #include <fcntl.h> 67 #include <signal.h> 68 #include <stdio.h> 69 #include <stdlib.h> 70 #include <string.h> 71 #include <syslog.h> 72 #include <unistd.h> 73 #include "defs.h" 74 75 static void usage __P((void)); 76 77 int 78 main(argc, argv) 79 int argc; 80 char *argv[]; 81 { 82 int c, fd, omask, maxfds; 83 fd_set rset; 84 85 /* 86 * Close any open file descriptors. 87 * Temporarily leave stdin & stdout open for `-d', 88 * and stderr open for any pre-syslog error messages. 89 */ 90 { 91 int i, nfds = getdtablesize(); 92 93 for (i = 0; i < nfds; i++) 94 if (i != fileno(stdin) && i != fileno(stdout) && 95 i != fileno(stderr)) 96 (void) close(i); 97 } 98 99 /* 100 * Parse any arguments. 101 */ 102 while ((c = getopt(argc, argv, "adi:")) != -1) 103 switch(c) { 104 case 'a': 105 BootAny++; 106 break; 107 case 'd': 108 DebugFlg++; 109 break; 110 case 'i': 111 IntfName = optarg; 112 break; 113 default: 114 usage(); 115 } 116 for (; optind < argc; optind++) { 117 if (ConfigFile == NULL) 118 ConfigFile = argv[optind]; 119 else { 120 warnx("too many config files (`%s' ignored)", 121 argv[optind]); 122 } 123 } 124 125 if (ConfigFile == NULL) /* use default config file */ 126 ConfigFile = DfltConfig; 127 128 if (DebugFlg) { 129 DbgFp = stdout; /* output to stdout */ 130 131 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 132 (void) signal(SIGUSR2, SIG_IGN); 133 (void) fclose(stderr); /* finished with it */ 134 } else { 135 if (daemon(0, 0)) 136 err(1, "can't detach from terminal"); 137 138 (void) signal(SIGUSR1, DebugOn); 139 (void) signal(SIGUSR2, DebugOff); 140 } 141 142 openlog("rbootd", LOG_PID, LOG_DAEMON); 143 144 /* 145 * If no interface was specified, get one now. 146 * 147 * This is convoluted because we want to get the default interface 148 * name for the syslog("restarted") message. If BpfGetIntfName() 149 * runs into an error, it will return a syslog-able error message 150 * (in `errmsg') which will be displayed here. 151 */ 152 if (IntfName == NULL) { 153 char *errmsg; 154 155 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 156 syslog(LOG_NOTICE, "restarted (??)"); 157 /* BpfGetIntfName() returns safe names, using %m */ 158 syslog(LOG_ERR, "%s", errmsg); 159 Exit(0); 160 } 161 } 162 163 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 164 165 (void) signal(SIGHUP, ReConfig); 166 (void) signal(SIGINT, Exit); 167 (void) signal(SIGTERM, Exit); 168 169 /* 170 * Grab our host name and pid. 171 */ 172 if (gethostname(MyHost, MAXHOSTNAMELEN - 1) < 0) { 173 syslog(LOG_ERR, "gethostname: %m"); 174 Exit(0); 175 } 176 MyHost[MAXHOSTNAMELEN - 1] = '\0'; 177 178 MyPid = getpid(); 179 180 /* 181 * Write proc's pid to a file. 182 */ 183 { 184 FILE *fp; 185 186 if ((fp = fopen(PidFile, "w")) != NULL) { 187 (void) fprintf(fp, "%d\n", (int) MyPid); 188 (void) fclose(fp); 189 } else { 190 syslog(LOG_WARNING, "fopen: failed (%s)", PidFile); 191 } 192 } 193 194 /* 195 * All boot files are relative to the boot directory, we might 196 * as well chdir() there to make life easier. 197 */ 198 if (chdir(BootDir) < 0) { 199 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 200 Exit(0); 201 } 202 203 /* 204 * Initial configuration. 205 */ 206 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 207 if (GetBootFiles() == 0) /* get list of boot files */ 208 Exit(0); 209 if (ParseConfig() == 0) /* parse config file */ 210 Exit(0); 211 212 /* 213 * Open and initialize a BPF device for the appropriate interface. 214 * If an error is encountered, a message is displayed and Exit() 215 * is called. 216 */ 217 fd = BpfOpen(); 218 219 (void) sigsetmask(omask); /* allow reconfig's */ 220 221 /* 222 * Main loop: receive a packet, determine where it came from, 223 * and if we service this host, call routine to handle request. 224 */ 225 maxfds = fd + 1; 226 FD_ZERO(&rset); 227 FD_SET(fd, &rset); 228 for (;;) { 229 struct timeval timeout; 230 fd_set r; 231 int nsel; 232 233 r = rset; 234 235 if (RmpConns == NULL) { /* timeout isnt necessary */ 236 nsel = select(maxfds, &r, NULL, NULL, NULL); 237 } else { 238 timeout.tv_sec = RMP_TIMEOUT; 239 timeout.tv_usec = 0; 240 nsel = select(maxfds, &r, NULL, NULL, &timeout); 241 } 242 243 if (nsel < 0) { 244 if (errno == EINTR) 245 continue; 246 syslog(LOG_ERR, "select: %m"); 247 Exit(0); 248 } else if (nsel == 0) { /* timeout */ 249 DoTimeout(); /* clear stale conns */ 250 continue; 251 } 252 253 if (FD_ISSET(fd, &r)) { 254 RMPCONN rconn; 255 CLIENT *client, *FindClient(); 256 int doread = 1; 257 258 while (BpfRead(&rconn, doread)) { 259 doread = 0; 260 261 if (DbgFp != NULL) /* display packet */ 262 DispPkt(&rconn,DIR_RCVD); 263 264 omask = sigblock(sigmask(SIGHUP)); 265 266 /* 267 * If we do not restrict service, set the 268 * client to NULL (ProcessPacket() handles 269 * this). Otherwise, check that we can 270 * service this host; if not, log a message 271 * and ignore the packet. 272 */ 273 if (BootAny) { 274 client = NULL; 275 } else if ((client=FindClient(&rconn))==NULL) { 276 syslog(LOG_INFO, 277 "%s: boot packet ignored", 278 EnetStr(&rconn)); 279 (void) sigsetmask(omask); 280 continue; 281 } 282 283 ProcessPacket(&rconn,client); 284 285 (void) sigsetmask(omask); 286 } 287 } 288 } 289 } 290 291 static void 292 usage() 293 { 294 fprintf(stderr, "usage: rbootd [-ad] [-i interface] [config_file]\n"); 295 exit (1); 296 } 297 298 /* 299 ** DoTimeout -- Free any connections that have timed out. 300 ** 301 ** Parameters: 302 ** None. 303 ** 304 ** Returns: 305 ** Nothing. 306 ** 307 ** Side Effects: 308 ** - Timed out connections in `RmpConns' will be freed. 309 */ 310 void 311 DoTimeout() 312 { 313 RMPCONN *rtmp; 314 struct timeval now; 315 316 (void) gettimeofday(&now, (struct timezone *)0); 317 318 /* 319 * For each active connection, if RMP_TIMEOUT seconds have passed 320 * since the last packet was sent, delete the connection. 321 */ 322 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 323 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 324 syslog(LOG_WARNING, "%s: connection timed out (%u)", 325 EnetStr(rtmp), rtmp->rmp.r_type); 326 RemoveConn(rtmp); 327 } 328 } 329 330 /* 331 ** FindClient -- Find client associated with a packet. 332 ** 333 ** Parameters: 334 ** rconn - the new packet. 335 ** 336 ** Returns: 337 ** Pointer to client info if found, NULL otherwise. 338 ** 339 ** Side Effects: 340 ** None. 341 ** 342 ** Warnings: 343 ** - This routine must be called with SIGHUP blocked since 344 ** a reconfigure can invalidate the information returned. 345 */ 346 347 CLIENT * 348 FindClient(rconn) 349 RMPCONN *rconn; 350 { 351 CLIENT *ctmp; 352 353 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 354 if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 355 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 356 break; 357 358 return(ctmp); 359 } 360 361 /* 362 ** Exit -- Log an error message and exit. 363 ** 364 ** Parameters: 365 ** sig - caught signal (or zero if not dying on a signal). 366 ** 367 ** Returns: 368 ** Does not return. 369 ** 370 ** Side Effects: 371 ** - This process ceases to exist. 372 */ 373 void 374 Exit(sig) 375 int sig; 376 { 377 if (sig > 0) 378 syslog(LOG_ERR, "going down on signal %d", sig); 379 else 380 syslog(LOG_ERR, "going down with fatal error"); 381 BpfClose(); 382 exit(1); 383 } 384 385 /* 386 ** ReConfig -- Get new list of boot files and reread config files. 387 ** 388 ** Parameters: 389 ** None. 390 ** 391 ** Returns: 392 ** Nothing. 393 ** 394 ** Side Effects: 395 ** - All active connections are dropped. 396 ** - List of boot-able files is changed. 397 ** - List of clients is changed. 398 ** 399 ** Warnings: 400 ** - This routine must be called with SIGHUP blocked. 401 */ 402 void 403 ReConfig(signo) 404 int signo; 405 { 406 syslog(LOG_NOTICE, "reconfiguring boot server"); 407 408 FreeConns(); 409 410 if (GetBootFiles() == 0) 411 Exit(0); 412 413 if (ParseConfig() == 0) 414 Exit(0); 415 } 416 417 /* 418 ** DebugOff -- Turn off debugging. 419 ** 420 ** Parameters: 421 ** None. 422 ** 423 ** Returns: 424 ** Nothing. 425 ** 426 ** Side Effects: 427 ** - Debug file is closed. 428 */ 429 void 430 DebugOff(signo) 431 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(signo) 454 int signo; 455 { 456 if (DbgFp == NULL) { 457 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 458 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 459 } 460 } 461