1 /* $NetBSD: rbootd.c,v 1.5 1995/10/06 05:12:17 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1992 The University of Utah and the Center 5 * for Software Science (CSS). 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * the Center for Software Science of the University of Utah Computer 11 * Science Department. CSS requests users of this software to return 12 * to css-dist@cs.utah.edu any improvements that they make and grant 13 * CSS redistribution rights. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93 44 * 45 * From: Utah Hdr: rbootd.c 3.1 92/07/06 46 * Author: Jeff Forys, University of Utah CSS 47 */ 48 49 #ifndef lint 50 static char copyright[] = 51 "@(#) Copyright (c) 1992, 1993\n\ 52 The Regents of the University of California. All rights reserved.\n"; 53 #endif /* not lint */ 54 55 #ifndef lint 56 /*static char sccsid[] = "@(#)rbootd.c 8.1 (Berkeley) 6/4/93";*/ 57 static char rcsid[] = "$NetBSD: rbootd.c,v 1.5 1995/10/06 05:12:17 thorpej Exp $"; 58 #endif /* not lint */ 59 60 #include <sys/param.h> 61 #include <sys/time.h> 62 #include <ctype.h> 63 #include <err.h> 64 #include <errno.h> 65 #include <fcntl.h> 66 #include <signal.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <syslog.h> 71 #include <unistd.h> 72 #include "defs.h" 73 74 extern char *__progname; /* from crt0.o */ 75 76 int 77 main(argc, argv) 78 int argc; 79 char *argv[]; 80 { 81 int c, fd, omask, maxfds; 82 fd_set rset; 83 84 /* 85 * Close any open file descriptors. 86 * Temporarily leave stdin & stdout open for `-d', 87 * and stderr open for any pre-syslog error messages. 88 */ 89 { 90 int i, nfds = getdtablesize(); 91 92 for (i = 0; i < nfds; i++) 93 if (i != fileno(stdin) && i != fileno(stdout) && 94 i != fileno(stderr)) 95 (void) close(i); 96 } 97 98 /* 99 * Parse any arguments. 100 */ 101 while ((c = getopt(argc, argv, "adi:")) != EOF) 102 switch(c) { 103 case 'a': 104 BootAny++; 105 break; 106 case 'd': 107 DebugFlg++; 108 break; 109 case 'i': 110 IntfName = optarg; 111 break; 112 } 113 for (; optind < argc; optind++) { 114 if (ConfigFile == NULL) 115 ConfigFile = argv[optind]; 116 else { 117 warnx("too many config files (`%s' ignored)\n", 118 argv[optind]); 119 } 120 } 121 122 if (ConfigFile == NULL) /* use default config file */ 123 ConfigFile = DfltConfig; 124 125 if (DebugFlg) { 126 DbgFp = stdout; /* output to stdout */ 127 128 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 129 (void) signal(SIGUSR2, SIG_IGN); 130 (void) fclose(stderr); /* finished with it */ 131 } else { 132 if (daemon(0, 0)) 133 err(1, "can't detach from terminal"); 134 135 (void) signal(SIGUSR1, DebugOn); 136 (void) signal(SIGUSR2, DebugOff); 137 } 138 139 openlog(__progname, LOG_PID, LOG_DAEMON); 140 141 /* 142 * If no interface was specified, get one now. 143 * 144 * This is convoluted because we want to get the default interface 145 * name for the syslog("restarted") message. If BpfGetIntfName() 146 * runs into an error, it will return a syslog-able error message 147 * (in `errmsg') which will be displayed here. 148 */ 149 if (IntfName == NULL) { 150 char *errmsg; 151 152 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 153 syslog(LOG_NOTICE, "restarted (??)"); 154 syslog(LOG_ERR, errmsg); 155 Exit(0); 156 } 157 } 158 159 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 160 161 (void) signal(SIGHUP, ReConfig); 162 (void) signal(SIGINT, Exit); 163 (void) signal(SIGTERM, Exit); 164 165 /* 166 * Grab our host name and pid. 167 */ 168 if (gethostname(MyHost, MAXHOSTNAMELEN) < 0) { 169 syslog(LOG_ERR, "gethostname: %m"); 170 Exit(0); 171 } 172 MyHost[MAXHOSTNAMELEN] = '\0'; 173 174 MyPid = getpid(); 175 176 /* 177 * Write proc's pid to a file. 178 */ 179 { 180 FILE *fp; 181 182 if ((fp = fopen(PidFile, "w")) != NULL) { 183 (void) fprintf(fp, "%d\n", (int) MyPid); 184 (void) fclose(fp); 185 } else { 186 syslog(LOG_WARNING, "fopen: failed (%s)", PidFile); 187 } 188 } 189 190 /* 191 * All boot files are relative to the boot directory, we might 192 * as well chdir() there to make life easier. 193 */ 194 if (chdir(BootDir) < 0) { 195 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 196 Exit(0); 197 } 198 199 /* 200 * Initial configuration. 201 */ 202 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 203 if (GetBootFiles() == 0) /* get list of boot files */ 204 Exit(0); 205 if (ParseConfig() == 0) /* parse config file */ 206 Exit(0); 207 208 /* 209 * Open and initialize a BPF device for the appropriate interface. 210 * If an error is encountered, a message is displayed and Exit() 211 * is called. 212 */ 213 fd = BpfOpen(); 214 215 (void) sigsetmask(omask); /* allow reconfig's */ 216 217 /* 218 * Main loop: receive a packet, determine where it came from, 219 * and if we service this host, call routine to handle request. 220 */ 221 maxfds = fd + 1; 222 FD_ZERO(&rset); 223 FD_SET(fd, &rset); 224 for (;;) { 225 struct timeval timeout; 226 fd_set r; 227 int nsel; 228 229 r = rset; 230 231 if (RmpConns == NULL) { /* timeout isnt necessary */ 232 nsel = select(maxfds, &r, NULL, NULL, NULL); 233 } else { 234 timeout.tv_sec = RMP_TIMEOUT; 235 timeout.tv_usec = 0; 236 nsel = select(maxfds, &r, NULL, NULL, &timeout); 237 } 238 239 if (nsel < 0) { 240 if (errno == EINTR) 241 continue; 242 syslog(LOG_ERR, "select: %m"); 243 Exit(0); 244 } else if (nsel == 0) { /* timeout */ 245 DoTimeout(); /* clear stale conns */ 246 continue; 247 } 248 249 if (FD_ISSET(fd, &r)) { 250 RMPCONN rconn; 251 CLIENT *client, *FindClient(); 252 int doread = 1; 253 254 while (BpfRead(&rconn, doread)) { 255 doread = 0; 256 257 if (DbgFp != NULL) /* display packet */ 258 DispPkt(&rconn,DIR_RCVD); 259 260 omask = sigblock(sigmask(SIGHUP)); 261 262 /* 263 * If we do not restrict service, set the 264 * client to NULL (ProcessPacket() handles 265 * this). Otherwise, check that we can 266 * service this host; if not, log a message 267 * and ignore the packet. 268 */ 269 if (BootAny) { 270 client = NULL; 271 } else if ((client=FindClient(&rconn))==NULL) { 272 syslog(LOG_INFO, 273 "%s: boot packet ignored", 274 EnetStr(&rconn)); 275 (void) sigsetmask(omask); 276 continue; 277 } 278 279 ProcessPacket(&rconn,client); 280 281 (void) sigsetmask(omask); 282 } 283 } 284 } 285 } 286 287 /* 288 ** DoTimeout -- Free any connections that have timed out. 289 ** 290 ** Parameters: 291 ** None. 292 ** 293 ** Returns: 294 ** Nothing. 295 ** 296 ** Side Effects: 297 ** - Timed out connections in `RmpConns' will be freed. 298 */ 299 void 300 DoTimeout() 301 { 302 register RMPCONN *rtmp; 303 struct timeval now; 304 305 (void) gettimeofday(&now, (struct timezone *)0); 306 307 /* 308 * For each active connection, if RMP_TIMEOUT seconds have passed 309 * since the last packet was sent, delete the connection. 310 */ 311 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 312 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 313 syslog(LOG_WARNING, "%s: connection timed out (%u)", 314 EnetStr(rtmp), rtmp->rmp.r_type); 315 RemoveConn(rtmp); 316 } 317 } 318 319 /* 320 ** FindClient -- Find client associated with a packet. 321 ** 322 ** Parameters: 323 ** rconn - the new packet. 324 ** 325 ** Returns: 326 ** Pointer to client info if found, NULL otherwise. 327 ** 328 ** Side Effects: 329 ** None. 330 ** 331 ** Warnings: 332 ** - This routine must be called with SIGHUP blocked since 333 ** a reconfigure can invalidate the information returned. 334 */ 335 336 CLIENT * 337 FindClient(rconn) 338 register RMPCONN *rconn; 339 { 340 register CLIENT *ctmp; 341 342 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 343 if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 344 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 345 break; 346 347 return(ctmp); 348 } 349 350 /* 351 ** Exit -- Log an error message and exit. 352 ** 353 ** Parameters: 354 ** sig - caught signal (or zero if not dying on a signal). 355 ** 356 ** Returns: 357 ** Does not return. 358 ** 359 ** Side Effects: 360 ** - This process ceases to exist. 361 */ 362 void 363 Exit(sig) 364 int sig; 365 { 366 if (sig > 0) 367 syslog(LOG_ERR, "going down on signal %d", sig); 368 else 369 syslog(LOG_ERR, "going down with fatal error"); 370 BpfClose(); 371 exit(1); 372 } 373 374 /* 375 ** ReConfig -- Get new list of boot files and reread config files. 376 ** 377 ** Parameters: 378 ** None. 379 ** 380 ** Returns: 381 ** Nothing. 382 ** 383 ** Side Effects: 384 ** - All active connections are dropped. 385 ** - List of boot-able files is changed. 386 ** - List of clients is changed. 387 ** 388 ** Warnings: 389 ** - This routine must be called with SIGHUP blocked. 390 */ 391 void 392 ReConfig(signo) 393 int signo; 394 { 395 syslog(LOG_NOTICE, "reconfiguring boot server"); 396 397 FreeConns(); 398 399 if (GetBootFiles() == 0) 400 Exit(0); 401 402 if (ParseConfig() == 0) 403 Exit(0); 404 } 405 406 /* 407 ** DebugOff -- Turn off debugging. 408 ** 409 ** Parameters: 410 ** None. 411 ** 412 ** Returns: 413 ** Nothing. 414 ** 415 ** Side Effects: 416 ** - Debug file is closed. 417 */ 418 void 419 DebugOff(signo) 420 int signo; 421 { 422 if (DbgFp != NULL) 423 (void) fclose(DbgFp); 424 425 DbgFp = NULL; 426 } 427 428 /* 429 ** DebugOn -- Turn on debugging. 430 ** 431 ** Parameters: 432 ** None. 433 ** 434 ** Returns: 435 ** Nothing. 436 ** 437 ** Side Effects: 438 ** - Debug file is opened/truncated if not already opened, 439 ** otherwise do nothing. 440 */ 441 void 442 DebugOn(signo) 443 int signo; 444 { 445 if (DbgFp == NULL) { 446 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 447 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 448 } 449 } 450