1 /* $NetBSD: rbootd.c,v 1.13 2001/01/16 02:36:29 cgd 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 1.13 2001/01/16 02:36:29 cgd 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 <util.h> 77 #include "defs.h" 78 79 int main __P((int, char *[])); 80 81 extern char *__progname; /* from crt0.o */ 82 83 int 84 main(argc, argv) 85 int argc; 86 char *argv[]; 87 { 88 int c, fd, omask, maxfds; 89 fd_set rset; 90 91 /* 92 * Close any open file descriptors. 93 * Temporarily leave stdin & stdout open for `-d', 94 * and stderr open for any pre-syslog error messages. 95 */ 96 { 97 int i, nfds = getdtablesize(); 98 99 for (i = 0; i < nfds; i++) 100 if (i != fileno(stdin) && i != fileno(stdout) && 101 i != fileno(stderr)) 102 (void) close(i); 103 } 104 105 /* 106 * Parse any arguments. 107 */ 108 while ((c = getopt(argc, argv, "adi:")) != -1) 109 switch(c) { 110 case 'a': 111 BootAny++; 112 break; 113 case 'd': 114 DebugFlg++; 115 break; 116 case 'i': 117 IntfName = optarg; 118 break; 119 } 120 for (; optind < argc; optind++) { 121 if (ConfigFile == NULL) 122 ConfigFile = argv[optind]; 123 else { 124 warnx("too many config files (`%s' ignored)\n", 125 argv[optind]); 126 } 127 } 128 129 if (ConfigFile == NULL) /* use default config file */ 130 ConfigFile = DfltConfig; 131 132 if (DebugFlg) { 133 DbgFp = stdout; /* output to stdout */ 134 135 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 136 (void) signal(SIGUSR2, SIG_IGN); 137 (void) fclose(stderr); /* finished with it */ 138 } else { 139 if (daemon(0, 0)) 140 err(1, "can't detach from terminal"); 141 pidfile(NULL); 142 143 (void) signal(SIGUSR1, DebugOn); 144 (void) signal(SIGUSR2, DebugOff); 145 } 146 147 openlog("rbootd", LOG_PID, LOG_DAEMON); 148 149 /* 150 * If no interface was specified, get one now. 151 * 152 * This is convoluted because we want to get the default interface 153 * name for the syslog("restarted") message. If BpfGetIntfName() 154 * runs into an error, it will return a syslog-able error message 155 * (in `errmsg') which will be displayed here. 156 */ 157 if (IntfName == NULL) { 158 char *errmsg; 159 160 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 161 /* backslash to avoid trigraph ??) */ 162 syslog(LOG_NOTICE, "restarted (?\?)"); 163 syslog(LOG_ERR, errmsg); 164 Exit(0); 165 } 166 } 167 168 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 169 170 (void) signal(SIGHUP, ReConfig); 171 (void) signal(SIGINT, Exit); 172 (void) signal(SIGTERM, Exit); 173 174 /* 175 * Grab our host name and pid. 176 */ 177 if (gethostname(MyHost, sizeof MyHost) < 0) { 178 syslog(LOG_ERR, "gethostname: %m"); 179 Exit(0); 180 } 181 MyHost[sizeof(MyHost) - 1] = '\0'; 182 183 /* 184 * All boot files are relative to the boot directory, we might 185 * as well chdir() there to make life easier. 186 */ 187 if (chdir(BootDir) < 0) { 188 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 189 Exit(0); 190 } 191 192 /* 193 * Initial configuration. 194 */ 195 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 196 if (GetBootFiles() == 0) /* get list of boot files */ 197 Exit(0); 198 if (ParseConfig() == 0) /* parse config file */ 199 Exit(0); 200 201 /* 202 * Open and initialize a BPF device for the appropriate interface. 203 * If an error is encountered, a message is displayed and Exit() 204 * is called. 205 */ 206 fd = BpfOpen(); 207 208 (void) sigsetmask(omask); /* allow reconfig's */ 209 210 /* 211 * Main loop: receive a packet, determine where it came from, 212 * and if we service this host, call routine to handle request. 213 */ 214 maxfds = fd + 1; 215 FD_ZERO(&rset); 216 FD_SET(fd, &rset); 217 for (;;) { 218 struct timeval timeout; 219 fd_set r; 220 int nsel; 221 222 r = rset; 223 224 if (RmpConns == NULL) { /* timeout isnt necessary */ 225 nsel = select(maxfds, &r, NULL, NULL, NULL); 226 } else { 227 timeout.tv_sec = RMP_TIMEOUT; 228 timeout.tv_usec = 0; 229 nsel = select(maxfds, &r, NULL, NULL, &timeout); 230 } 231 232 if (nsel < 0) { 233 if (errno == EINTR) 234 continue; 235 syslog(LOG_ERR, "select: %m"); 236 Exit(0); 237 } else if (nsel == 0) { /* timeout */ 238 DoTimeout(); /* clear stale conns */ 239 continue; 240 } 241 242 if (FD_ISSET(fd, &r)) { 243 RMPCONN rconn; 244 CLIENT *client; 245 int doread = 1; 246 247 while (BpfRead(&rconn, doread)) { 248 doread = 0; 249 250 if (DbgFp != NULL) /* display packet */ 251 DispPkt(&rconn,DIR_RCVD); 252 253 omask = sigblock(sigmask(SIGHUP)); 254 255 /* 256 * If we do not restrict service, set the 257 * client to NULL (ProcessPacket() handles 258 * this). Otherwise, check that we can 259 * service this host; if not, log a message 260 * and ignore the packet. 261 */ 262 if (BootAny) { 263 client = NULL; 264 } else if ((client=FindClient(&rconn))==NULL) { 265 syslog(LOG_INFO, 266 "%s: boot packet ignored", 267 EnetStr(&rconn)); 268 (void) sigsetmask(omask); 269 continue; 270 } 271 272 ProcessPacket(&rconn,client); 273 274 (void) sigsetmask(omask); 275 } 276 } 277 } 278 } 279 280 /* 281 ** DoTimeout -- Free any connections that have timed out. 282 ** 283 ** Parameters: 284 ** None. 285 ** 286 ** Returns: 287 ** Nothing. 288 ** 289 ** Side Effects: 290 ** - Timed out connections in `RmpConns' will be freed. 291 */ 292 void 293 DoTimeout() 294 { 295 RMPCONN *rtmp; 296 struct timeval now; 297 298 (void) gettimeofday(&now, (struct timezone *)0); 299 300 /* 301 * For each active connection, if RMP_TIMEOUT seconds have passed 302 * since the last packet was sent, delete the connection. 303 */ 304 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 305 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 306 syslog(LOG_WARNING, "%s: connection timed out (%u)", 307 EnetStr(rtmp), rtmp->rmp.r_type); 308 RemoveConn(rtmp); 309 } 310 } 311 312 /* 313 ** FindClient -- Find client associated with a packet. 314 ** 315 ** Parameters: 316 ** rconn - the new packet. 317 ** 318 ** Returns: 319 ** Pointer to client info if found, NULL otherwise. 320 ** 321 ** Side Effects: 322 ** None. 323 ** 324 ** Warnings: 325 ** - This routine must be called with SIGHUP blocked since 326 ** a reconfigure can invalidate the information returned. 327 */ 328 329 CLIENT * 330 FindClient(rconn) 331 RMPCONN *rconn; 332 { 333 CLIENT *ctmp; 334 335 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 336 if (memcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 337 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 338 break; 339 340 return(ctmp); 341 } 342 343 /* 344 ** Exit -- Log an error message and exit. 345 ** 346 ** Parameters: 347 ** sig - caught signal (or zero if not dying on a signal). 348 ** 349 ** Returns: 350 ** Does not return. 351 ** 352 ** Side Effects: 353 ** - This process ceases to exist. 354 */ 355 void 356 Exit(sig) 357 int sig; 358 { 359 if (sig > 0) 360 syslog(LOG_ERR, "going down on signal %d", sig); 361 else 362 syslog(LOG_ERR, "going down with fatal error"); 363 BpfClose(); 364 exit(1); 365 } 366 367 /* 368 ** ReConfig -- Get new list of boot files and reread config files. 369 ** 370 ** Parameters: 371 ** None. 372 ** 373 ** Returns: 374 ** Nothing. 375 ** 376 ** Side Effects: 377 ** - All active connections are dropped. 378 ** - List of boot-able files is changed. 379 ** - List of clients is changed. 380 ** 381 ** Warnings: 382 ** - This routine must be called with SIGHUP blocked. 383 */ 384 void 385 ReConfig(signo) 386 int signo; 387 { 388 syslog(LOG_NOTICE, "reconfiguring boot server"); 389 390 FreeConns(); 391 392 if (GetBootFiles() == 0) 393 Exit(0); 394 395 if (ParseConfig() == 0) 396 Exit(0); 397 } 398 399 /* 400 ** DebugOff -- Turn off debugging. 401 ** 402 ** Parameters: 403 ** None. 404 ** 405 ** Returns: 406 ** Nothing. 407 ** 408 ** Side Effects: 409 ** - Debug file is closed. 410 */ 411 void 412 DebugOff(signo) 413 int signo; 414 { 415 if (DbgFp != NULL) 416 (void) fclose(DbgFp); 417 418 DbgFp = NULL; 419 } 420 421 /* 422 ** DebugOn -- Turn on debugging. 423 ** 424 ** Parameters: 425 ** None. 426 ** 427 ** Returns: 428 ** Nothing. 429 ** 430 ** Side Effects: 431 ** - Debug file is opened/truncated if not already opened, 432 ** otherwise do nothing. 433 */ 434 void 435 DebugOn(signo) 436 int signo; 437 { 438 if (DbgFp == NULL) { 439 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 440 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 441 } 442 } 443