1 /* $NetBSD: rbootd.c,v 1.9 1998/07/06 06:57:52 mrg 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 #include <sys/cdefs.h> 50 #ifndef lint 51 __COPYRIGHT( 52 "@(#) Copyright (c) 1992, 1993\n\ 53 The Regents of the University of California. All rights reserved.\n"); 54 #endif /* not lint */ 55 56 #ifndef lint 57 #if 0 58 static char sccsid[] = "@(#)rbootd.c 8.1 (Berkeley) 6/4/93"; 59 #else 60 __RCSID("$NetBSD: rbootd.c,v 1.9 1998/07/06 06:57:52 mrg Exp $"); 61 #endif 62 #endif /* not lint */ 63 64 #include <sys/param.h> 65 #include <sys/time.h> 66 #include <ctype.h> 67 #include <err.h> 68 #include <errno.h> 69 #include <fcntl.h> 70 #include <signal.h> 71 #include <stdio.h> 72 #include <stdlib.h> 73 #include <string.h> 74 #include <syslog.h> 75 #include <unistd.h> 76 #include "defs.h" 77 78 int main __P((int, char *[])); 79 80 extern char *__progname; /* from crt0.o */ 81 82 int 83 main(argc, argv) 84 int argc; 85 char *argv[]; 86 { 87 int c, fd, omask, maxfds; 88 fd_set rset; 89 90 /* 91 * Close any open file descriptors. 92 * Temporarily leave stdin & stdout open for `-d', 93 * and stderr open for any pre-syslog error messages. 94 */ 95 { 96 int i, nfds = getdtablesize(); 97 98 for (i = 0; i < nfds; i++) 99 if (i != fileno(stdin) && i != fileno(stdout) && 100 i != fileno(stderr)) 101 (void) close(i); 102 } 103 104 /* 105 * Parse any arguments. 106 */ 107 while ((c = getopt(argc, argv, "adi:")) != -1) 108 switch(c) { 109 case 'a': 110 BootAny++; 111 break; 112 case 'd': 113 DebugFlg++; 114 break; 115 case 'i': 116 IntfName = optarg; 117 break; 118 } 119 for (; optind < argc; optind++) { 120 if (ConfigFile == NULL) 121 ConfigFile = argv[optind]; 122 else { 123 warnx("too many config files (`%s' ignored)\n", 124 argv[optind]); 125 } 126 } 127 128 if (ConfigFile == NULL) /* use default config file */ 129 ConfigFile = DfltConfig; 130 131 if (DebugFlg) { 132 DbgFp = stdout; /* output to stdout */ 133 134 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 135 (void) signal(SIGUSR2, SIG_IGN); 136 (void) fclose(stderr); /* finished with it */ 137 } else { 138 if (daemon(0, 0)) 139 err(1, "can't detach from terminal"); 140 141 (void) signal(SIGUSR1, DebugOn); 142 (void) signal(SIGUSR2, DebugOff); 143 } 144 145 openlog(__progname, LOG_PID, LOG_DAEMON); 146 147 /* 148 * If no interface was specified, get one now. 149 * 150 * This is convoluted because we want to get the default interface 151 * name for the syslog("restarted") message. If BpfGetIntfName() 152 * runs into an error, it will return a syslog-able error message 153 * (in `errmsg') which will be displayed here. 154 */ 155 if (IntfName == NULL) { 156 char *errmsg; 157 158 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 159 syslog(LOG_NOTICE, "restarted (??)"); 160 syslog(LOG_ERR, errmsg); 161 Exit(0); 162 } 163 } 164 165 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 166 167 (void) signal(SIGHUP, ReConfig); 168 (void) signal(SIGINT, Exit); 169 (void) signal(SIGTERM, Exit); 170 171 /* 172 * Grab our host name and pid. 173 */ 174 if (gethostname(MyHost, sizeof MyHost) < 0) { 175 syslog(LOG_ERR, "gethostname: %m"); 176 Exit(0); 177 } 178 MyHost[sizeof(MyHost) - 1] = '\0'; 179 180 MyPid = getpid(); 181 182 /* 183 * Write proc's pid to a file. 184 */ 185 { 186 FILE *fp; 187 188 if ((fp = fopen(PidFile, "w")) != NULL) { 189 (void) fprintf(fp, "%d\n", (int) MyPid); 190 (void) fclose(fp); 191 } else { 192 syslog(LOG_WARNING, "fopen: failed (%s)", PidFile); 193 } 194 } 195 196 /* 197 * All boot files are relative to the boot directory, we might 198 * as well chdir() there to make life easier. 199 */ 200 if (chdir(BootDir) < 0) { 201 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 202 Exit(0); 203 } 204 205 /* 206 * Initial configuration. 207 */ 208 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 209 if (GetBootFiles() == 0) /* get list of boot files */ 210 Exit(0); 211 if (ParseConfig() == 0) /* parse config file */ 212 Exit(0); 213 214 /* 215 * Open and initialize a BPF device for the appropriate interface. 216 * If an error is encountered, a message is displayed and Exit() 217 * is called. 218 */ 219 fd = BpfOpen(); 220 221 (void) sigsetmask(omask); /* allow reconfig's */ 222 223 /* 224 * Main loop: receive a packet, determine where it came from, 225 * and if we service this host, call routine to handle request. 226 */ 227 maxfds = fd + 1; 228 FD_ZERO(&rset); 229 FD_SET(fd, &rset); 230 for (;;) { 231 struct timeval timeout; 232 fd_set r; 233 int nsel; 234 235 r = rset; 236 237 if (RmpConns == NULL) { /* timeout isnt necessary */ 238 nsel = select(maxfds, &r, NULL, NULL, NULL); 239 } else { 240 timeout.tv_sec = RMP_TIMEOUT; 241 timeout.tv_usec = 0; 242 nsel = select(maxfds, &r, NULL, NULL, &timeout); 243 } 244 245 if (nsel < 0) { 246 if (errno == EINTR) 247 continue; 248 syslog(LOG_ERR, "select: %m"); 249 Exit(0); 250 } else if (nsel == 0) { /* timeout */ 251 DoTimeout(); /* clear stale conns */ 252 continue; 253 } 254 255 if (FD_ISSET(fd, &r)) { 256 RMPCONN rconn; 257 CLIENT *client; 258 int doread = 1; 259 260 while (BpfRead(&rconn, doread)) { 261 doread = 0; 262 263 if (DbgFp != NULL) /* display packet */ 264 DispPkt(&rconn,DIR_RCVD); 265 266 omask = sigblock(sigmask(SIGHUP)); 267 268 /* 269 * If we do not restrict service, set the 270 * client to NULL (ProcessPacket() handles 271 * this). Otherwise, check that we can 272 * service this host; if not, log a message 273 * and ignore the packet. 274 */ 275 if (BootAny) { 276 client = NULL; 277 } else if ((client=FindClient(&rconn))==NULL) { 278 syslog(LOG_INFO, 279 "%s: boot packet ignored", 280 EnetStr(&rconn)); 281 (void) sigsetmask(omask); 282 continue; 283 } 284 285 ProcessPacket(&rconn,client); 286 287 (void) sigsetmask(omask); 288 } 289 } 290 } 291 } 292 293 /* 294 ** DoTimeout -- Free any connections that have timed out. 295 ** 296 ** Parameters: 297 ** None. 298 ** 299 ** Returns: 300 ** Nothing. 301 ** 302 ** Side Effects: 303 ** - Timed out connections in `RmpConns' will be freed. 304 */ 305 void 306 DoTimeout() 307 { 308 RMPCONN *rtmp; 309 struct timeval now; 310 311 (void) gettimeofday(&now, (struct timezone *)0); 312 313 /* 314 * For each active connection, if RMP_TIMEOUT seconds have passed 315 * since the last packet was sent, delete the connection. 316 */ 317 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 318 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 319 syslog(LOG_WARNING, "%s: connection timed out (%u)", 320 EnetStr(rtmp), rtmp->rmp.r_type); 321 RemoveConn(rtmp); 322 } 323 } 324 325 /* 326 ** FindClient -- Find client associated with a packet. 327 ** 328 ** Parameters: 329 ** rconn - the new packet. 330 ** 331 ** Returns: 332 ** Pointer to client info if found, NULL otherwise. 333 ** 334 ** Side Effects: 335 ** None. 336 ** 337 ** Warnings: 338 ** - This routine must be called with SIGHUP blocked since 339 ** a reconfigure can invalidate the information returned. 340 */ 341 342 CLIENT * 343 FindClient(rconn) 344 RMPCONN *rconn; 345 { 346 CLIENT *ctmp; 347 348 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 349 if (memcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 350 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 351 break; 352 353 return(ctmp); 354 } 355 356 /* 357 ** Exit -- Log an error message and exit. 358 ** 359 ** Parameters: 360 ** sig - caught signal (or zero if not dying on a signal). 361 ** 362 ** Returns: 363 ** Does not return. 364 ** 365 ** Side Effects: 366 ** - This process ceases to exist. 367 */ 368 void 369 Exit(sig) 370 int sig; 371 { 372 if (sig > 0) 373 syslog(LOG_ERR, "going down on signal %d", sig); 374 else 375 syslog(LOG_ERR, "going down with fatal error"); 376 BpfClose(); 377 exit(1); 378 } 379 380 /* 381 ** ReConfig -- Get new list of boot files and reread config files. 382 ** 383 ** Parameters: 384 ** None. 385 ** 386 ** Returns: 387 ** Nothing. 388 ** 389 ** Side Effects: 390 ** - All active connections are dropped. 391 ** - List of boot-able files is changed. 392 ** - List of clients is changed. 393 ** 394 ** Warnings: 395 ** - This routine must be called with SIGHUP blocked. 396 */ 397 void 398 ReConfig(signo) 399 int signo; 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(signo) 426 int signo; 427 { 428 if (DbgFp != NULL) 429 (void) fclose(DbgFp); 430 431 DbgFp = NULL; 432 } 433 434 /* 435 ** DebugOn -- Turn on debugging. 436 ** 437 ** Parameters: 438 ** None. 439 ** 440 ** Returns: 441 ** Nothing. 442 ** 443 ** Side Effects: 444 ** - Debug file is opened/truncated if not already opened, 445 ** otherwise do nothing. 446 */ 447 void 448 DebugOn(signo) 449 int signo; 450 { 451 if (DbgFp == NULL) { 452 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 453 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 454 } 455 } 456