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 #endif /* not lint */ 58 #include <sys/cdefs.h> 59 __FBSDID("$FreeBSD$"); 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(void); 76 77 int 78 main(int argc, char *argv[]) 79 { 80 int c, fd, omask, maxfds; 81 fd_set rset; 82 83 /* 84 * Close any open file descriptors. 85 * Temporarily leave stdin & stdout open for `-d', 86 * and stderr open for any pre-syslog error messages. 87 */ 88 { 89 int i, nfds = getdtablesize(); 90 91 for (i = 0; i < nfds; i++) 92 if (i != fileno(stdin) && i != fileno(stdout) && 93 i != fileno(stderr)) 94 (void) close(i); 95 } 96 97 /* 98 * Parse any arguments. 99 */ 100 while ((c = getopt(argc, argv, "adi:")) != -1) 101 switch(c) { 102 case 'a': 103 BootAny++; 104 break; 105 case 'd': 106 DebugFlg++; 107 break; 108 case 'i': 109 IntfName = optarg; 110 break; 111 default: 112 usage(); 113 } 114 for (; optind < argc; optind++) { 115 if (ConfigFile == NULL) 116 ConfigFile = argv[optind]; 117 else { 118 warnx("too many config files (`%s' ignored)", 119 argv[optind]); 120 } 121 } 122 123 if (ConfigFile == NULL) /* use default config file */ 124 ConfigFile = DfltConfig; 125 126 if (DebugFlg) { 127 DbgFp = stdout; /* output to stdout */ 128 129 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 130 (void) signal(SIGUSR2, SIG_IGN); 131 (void) fclose(stderr); /* finished with it */ 132 } else { 133 if (daemon(0, 0)) 134 err(1, "can't detach from terminal"); 135 136 (void) signal(SIGUSR1, DebugOn); 137 (void) signal(SIGUSR2, DebugOff); 138 } 139 140 openlog("rbootd", LOG_PID, LOG_DAEMON); 141 142 /* 143 * If no interface was specified, get one now. 144 * 145 * This is convoluted because we want to get the default interface 146 * name for the syslog("restarted") message. If BpfGetIntfName() 147 * runs into an error, it will return a syslog-able error message 148 * (in `errmsg') which will be displayed here. 149 */ 150 if (IntfName == NULL) { 151 char *errmsg; 152 153 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 154 /* Backslash to avoid trigraph '??)'. */ 155 syslog(LOG_NOTICE, "restarted (?\?)"); 156 /* BpfGetIntfName() returns safe names, using %m */ 157 syslog(LOG_ERR, "%s", errmsg); 158 Exit(0); 159 } 160 } 161 162 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 163 164 (void) signal(SIGHUP, ReConfig); 165 (void) signal(SIGINT, Exit); 166 (void) signal(SIGTERM, Exit); 167 168 /* 169 * Grab our host name and pid. 170 */ 171 if (gethostname(MyHost, MAXHOSTNAMELEN - 1) < 0) { 172 syslog(LOG_ERR, "gethostname: %m"); 173 Exit(0); 174 } 175 MyHost[MAXHOSTNAMELEN - 1] = '\0'; 176 177 MyPid = getpid(); 178 179 /* 180 * Write proc's pid to a file. 181 */ 182 { 183 FILE *fp; 184 185 if ((fp = fopen(PidFile, "w")) != NULL) { 186 (void) fprintf(fp, "%d\n", (int) MyPid); 187 (void) fclose(fp); 188 } else { 189 syslog(LOG_WARNING, "fopen: failed (%s)", PidFile); 190 } 191 } 192 193 /* 194 * All boot files are relative to the boot directory, we might 195 * as well chdir() there to make life easier. 196 */ 197 if (chdir(BootDir) < 0) { 198 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 199 Exit(0); 200 } 201 202 /* 203 * Initial configuration. 204 */ 205 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 206 if (GetBootFiles() == 0) /* get list of boot files */ 207 Exit(0); 208 if (ParseConfig() == 0) /* parse config file */ 209 Exit(0); 210 211 /* 212 * Open and initialize a BPF device for the appropriate interface. 213 * If an error is encountered, a message is displayed and Exit() 214 * is called. 215 */ 216 fd = BpfOpen(); 217 218 (void) sigsetmask(omask); /* allow reconfig's */ 219 220 /* 221 * Main loop: receive a packet, determine where it came from, 222 * and if we service this host, call routine to handle request. 223 */ 224 maxfds = fd + 1; 225 FD_ZERO(&rset); 226 FD_SET(fd, &rset); 227 for (;;) { 228 struct timeval timeout; 229 fd_set r; 230 int nsel; 231 232 r = rset; 233 234 if (RmpConns == NULL) { /* timeout isn't necessary */ 235 nsel = select(maxfds, &r, NULL, NULL, NULL); 236 } else { 237 timeout.tv_sec = RMP_TIMEOUT; 238 timeout.tv_usec = 0; 239 nsel = select(maxfds, &r, NULL, NULL, &timeout); 240 } 241 242 if (nsel < 0) { 243 if (errno == EINTR) 244 continue; 245 syslog(LOG_ERR, "select: %m"); 246 Exit(0); 247 } else if (nsel == 0) { /* timeout */ 248 DoTimeout(); /* clear stale conns */ 249 continue; 250 } 251 252 if (FD_ISSET(fd, &r)) { 253 RMPCONN rconn; 254 CLIENT *client, *FindClient(); 255 int doread = 1; 256 257 while (BpfRead(&rconn, doread)) { 258 doread = 0; 259 260 if (DbgFp != NULL) /* display packet */ 261 DispPkt(&rconn,DIR_RCVD); 262 263 omask = sigblock(sigmask(SIGHUP)); 264 265 /* 266 * If we do not restrict service, set the 267 * client to NULL (ProcessPacket() handles 268 * this). Otherwise, check that we can 269 * service this host; if not, log a message 270 * and ignore the packet. 271 */ 272 if (BootAny) { 273 client = NULL; 274 } else if ((client=FindClient(&rconn))==NULL) { 275 syslog(LOG_INFO, 276 "%s: boot packet ignored", 277 EnetStr(&rconn)); 278 (void) sigsetmask(omask); 279 continue; 280 } 281 282 ProcessPacket(&rconn,client); 283 284 (void) sigsetmask(omask); 285 } 286 } 287 } 288 } 289 290 static void 291 usage(void) 292 { 293 fprintf(stderr, "usage: rbootd [-ad] [-i interface] [config_file]\n"); 294 exit (1); 295 } 296 297 /* 298 ** DoTimeout -- Free any connections that have timed out. 299 ** 300 ** Parameters: 301 ** None. 302 ** 303 ** Returns: 304 ** Nothing. 305 ** 306 ** Side Effects: 307 ** - Timed out connections in `RmpConns' will be freed. 308 */ 309 void 310 DoTimeout(void) 311 { 312 RMPCONN *rtmp; 313 time_t now; 314 315 /* 316 * For each active connection, if RMP_TIMEOUT seconds have passed 317 * since the last packet was sent, delete the connection. 318 */ 319 now = time(NULL); 320 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 321 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now) { 322 syslog(LOG_WARNING, "%s: connection timed out (%u)", 323 EnetStr(rtmp), rtmp->rmp.r_type); 324 RemoveConn(rtmp); 325 } 326 } 327 328 /* 329 ** FindClient -- Find client associated with a packet. 330 ** 331 ** Parameters: 332 ** rconn - the new packet. 333 ** 334 ** Returns: 335 ** Pointer to client info if found, NULL otherwise. 336 ** 337 ** Side Effects: 338 ** None. 339 ** 340 ** Warnings: 341 ** - This routine must be called with SIGHUP blocked since 342 ** a reconfigure can invalidate the information returned. 343 */ 344 345 CLIENT * 346 FindClient(RMPCONN *rconn) 347 { 348 CLIENT *ctmp; 349 350 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 351 if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 352 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 353 break; 354 355 return(ctmp); 356 } 357 358 /* 359 ** Exit -- Log an error message and exit. 360 ** 361 ** Parameters: 362 ** sig - caught signal (or zero if not dying on a signal). 363 ** 364 ** Returns: 365 ** Does not return. 366 ** 367 ** Side Effects: 368 ** - This process ceases to exist. 369 */ 370 void 371 Exit(int sig) 372 { 373 if (sig > 0) 374 syslog(LOG_ERR, "going down on signal %d", sig); 375 else 376 syslog(LOG_ERR, "going down with fatal error"); 377 BpfClose(); 378 exit(1); 379 } 380 381 /* 382 ** ReConfig -- Get new list of boot files and reread config files. 383 ** 384 ** Parameters: 385 ** None. 386 ** 387 ** Returns: 388 ** Nothing. 389 ** 390 ** Side Effects: 391 ** - All active connections are dropped. 392 ** - List of boot-able files is changed. 393 ** - List of clients is changed. 394 ** 395 ** Warnings: 396 ** - This routine must be called with SIGHUP blocked. 397 */ 398 void 399 ReConfig(int signo __unused) 400 { 401 syslog(LOG_NOTICE, "reconfiguring boot server"); 402 403 FreeConns(); 404 405 if (GetBootFiles() == 0) 406 Exit(0); 407 408 if (ParseConfig() == 0) 409 Exit(0); 410 } 411 412 /* 413 ** DebugOff -- Turn off debugging. 414 ** 415 ** Parameters: 416 ** None. 417 ** 418 ** Returns: 419 ** Nothing. 420 ** 421 ** Side Effects: 422 ** - Debug file is closed. 423 */ 424 void 425 DebugOff(int signo __unused) 426 { 427 if (DbgFp != NULL) 428 (void) fclose(DbgFp); 429 430 DbgFp = NULL; 431 } 432 433 /* 434 ** DebugOn -- Turn on debugging. 435 ** 436 ** Parameters: 437 ** None. 438 ** 439 ** Returns: 440 ** Nothing. 441 ** 442 ** Side Effects: 443 ** - Debug file is opened/truncated if not already opened, 444 ** otherwise do nothing. 445 */ 446 void 447 DebugOn(int signo __unused) 448 { 449 if (DbgFp == NULL) { 450 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 451 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 452 } 453 } 454