1 /* $NetBSD: rbootd.c,v 1.14 2001/02/19 23:22:46 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 1.14 2001/02/19 23:22:46 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 int 82 main(argc, argv) 83 int argc; 84 char *argv[]; 85 { 86 int c, fd, omask, maxfds; 87 fd_set rset; 88 89 /* 90 * Close any open file descriptors. 91 * Temporarily leave stdin & stdout open for `-d', 92 * and stderr open for any pre-syslog error messages. 93 */ 94 { 95 int i, nfds = getdtablesize(); 96 97 for (i = 0; i < nfds; i++) 98 if (i != fileno(stdin) && i != fileno(stdout) && 99 i != fileno(stderr)) 100 (void) close(i); 101 } 102 103 /* 104 * Parse any arguments. 105 */ 106 while ((c = getopt(argc, argv, "adi:")) != -1) 107 switch(c) { 108 case 'a': 109 BootAny++; 110 break; 111 case 'd': 112 DebugFlg++; 113 break; 114 case 'i': 115 IntfName = optarg; 116 break; 117 } 118 for (; optind < argc; optind++) { 119 if (ConfigFile == NULL) 120 ConfigFile = argv[optind]; 121 else { 122 warnx("too many config files (`%s' ignored)\n", 123 argv[optind]); 124 } 125 } 126 127 if (ConfigFile == NULL) /* use default config file */ 128 ConfigFile = DfltConfig; 129 130 if (DebugFlg) { 131 DbgFp = stdout; /* output to stdout */ 132 133 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 134 (void) signal(SIGUSR2, SIG_IGN); 135 (void) fclose(stderr); /* finished with it */ 136 } else { 137 if (daemon(0, 0)) 138 err(1, "can't detach from terminal"); 139 pidfile(NULL); 140 141 (void) signal(SIGUSR1, DebugOn); 142 (void) signal(SIGUSR2, DebugOff); 143 } 144 145 openlog("rbootd", 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 /* backslash to avoid trigraph ??) */ 160 syslog(LOG_NOTICE, "restarted (?\?)"); 161 syslog(LOG_ERR, errmsg); 162 Exit(0); 163 } 164 } 165 166 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 167 168 (void) signal(SIGHUP, ReConfig); 169 (void) signal(SIGINT, Exit); 170 (void) signal(SIGTERM, Exit); 171 172 /* 173 * Grab our host name and pid. 174 */ 175 if (gethostname(MyHost, sizeof MyHost) < 0) { 176 syslog(LOG_ERR, "gethostname: %m"); 177 Exit(0); 178 } 179 MyHost[sizeof(MyHost) - 1] = '\0'; 180 181 /* 182 * All boot files are relative to the boot directory, we might 183 * as well chdir() there to make life easier. 184 */ 185 if (chdir(BootDir) < 0) { 186 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 187 Exit(0); 188 } 189 190 /* 191 * Initial configuration. 192 */ 193 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 194 if (GetBootFiles() == 0) /* get list of boot files */ 195 Exit(0); 196 if (ParseConfig() == 0) /* parse config file */ 197 Exit(0); 198 199 /* 200 * Open and initialize a BPF device for the appropriate interface. 201 * If an error is encountered, a message is displayed and Exit() 202 * is called. 203 */ 204 fd = BpfOpen(); 205 206 (void) sigsetmask(omask); /* allow reconfig's */ 207 208 /* 209 * Main loop: receive a packet, determine where it came from, 210 * and if we service this host, call routine to handle request. 211 */ 212 maxfds = fd + 1; 213 FD_ZERO(&rset); 214 FD_SET(fd, &rset); 215 for (;;) { 216 struct timeval timeout; 217 fd_set r; 218 int nsel; 219 220 r = rset; 221 222 if (RmpConns == NULL) { /* timeout isnt necessary */ 223 nsel = select(maxfds, &r, NULL, NULL, NULL); 224 } else { 225 timeout.tv_sec = RMP_TIMEOUT; 226 timeout.tv_usec = 0; 227 nsel = select(maxfds, &r, NULL, NULL, &timeout); 228 } 229 230 if (nsel < 0) { 231 if (errno == EINTR) 232 continue; 233 syslog(LOG_ERR, "select: %m"); 234 Exit(0); 235 } else if (nsel == 0) { /* timeout */ 236 DoTimeout(); /* clear stale conns */ 237 continue; 238 } 239 240 if (FD_ISSET(fd, &r)) { 241 RMPCONN rconn; 242 CLIENT *client; 243 int doread = 1; 244 245 while (BpfRead(&rconn, doread)) { 246 doread = 0; 247 248 if (DbgFp != NULL) /* display packet */ 249 DispPkt(&rconn,DIR_RCVD); 250 251 omask = sigblock(sigmask(SIGHUP)); 252 253 /* 254 * If we do not restrict service, set the 255 * client to NULL (ProcessPacket() handles 256 * this). Otherwise, check that we can 257 * service this host; if not, log a message 258 * and ignore the packet. 259 */ 260 if (BootAny) { 261 client = NULL; 262 } else if ((client=FindClient(&rconn))==NULL) { 263 syslog(LOG_INFO, 264 "%s: boot packet ignored", 265 EnetStr(&rconn)); 266 (void) sigsetmask(omask); 267 continue; 268 } 269 270 ProcessPacket(&rconn,client); 271 272 (void) sigsetmask(omask); 273 } 274 } 275 } 276 } 277 278 /* 279 ** DoTimeout -- Free any connections that have timed out. 280 ** 281 ** Parameters: 282 ** None. 283 ** 284 ** Returns: 285 ** Nothing. 286 ** 287 ** Side Effects: 288 ** - Timed out connections in `RmpConns' will be freed. 289 */ 290 void 291 DoTimeout() 292 { 293 RMPCONN *rtmp; 294 struct timeval now; 295 296 (void) gettimeofday(&now, (struct timezone *)0); 297 298 /* 299 * For each active connection, if RMP_TIMEOUT seconds have passed 300 * since the last packet was sent, delete the connection. 301 */ 302 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 303 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 304 syslog(LOG_WARNING, "%s: connection timed out (%u)", 305 EnetStr(rtmp), rtmp->rmp.r_type); 306 RemoveConn(rtmp); 307 } 308 } 309 310 /* 311 ** FindClient -- Find client associated with a packet. 312 ** 313 ** Parameters: 314 ** rconn - the new packet. 315 ** 316 ** Returns: 317 ** Pointer to client info if found, NULL otherwise. 318 ** 319 ** Side Effects: 320 ** None. 321 ** 322 ** Warnings: 323 ** - This routine must be called with SIGHUP blocked since 324 ** a reconfigure can invalidate the information returned. 325 */ 326 327 CLIENT * 328 FindClient(rconn) 329 RMPCONN *rconn; 330 { 331 CLIENT *ctmp; 332 333 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 334 if (memcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 335 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 336 break; 337 338 return(ctmp); 339 } 340 341 /* 342 ** Exit -- Log an error message and exit. 343 ** 344 ** Parameters: 345 ** sig - caught signal (or zero if not dying on a signal). 346 ** 347 ** Returns: 348 ** Does not return. 349 ** 350 ** Side Effects: 351 ** - This process ceases to exist. 352 */ 353 void 354 Exit(sig) 355 int sig; 356 { 357 if (sig > 0) 358 syslog(LOG_ERR, "going down on signal %d", sig); 359 else 360 syslog(LOG_ERR, "going down with fatal error"); 361 BpfClose(); 362 exit(1); 363 } 364 365 /* 366 ** ReConfig -- Get new list of boot files and reread config files. 367 ** 368 ** Parameters: 369 ** None. 370 ** 371 ** Returns: 372 ** Nothing. 373 ** 374 ** Side Effects: 375 ** - All active connections are dropped. 376 ** - List of boot-able files is changed. 377 ** - List of clients is changed. 378 ** 379 ** Warnings: 380 ** - This routine must be called with SIGHUP blocked. 381 */ 382 void 383 ReConfig(signo) 384 int signo; 385 { 386 syslog(LOG_NOTICE, "reconfiguring boot server"); 387 388 FreeConns(); 389 390 if (GetBootFiles() == 0) 391 Exit(0); 392 393 if (ParseConfig() == 0) 394 Exit(0); 395 } 396 397 /* 398 ** DebugOff -- Turn off debugging. 399 ** 400 ** Parameters: 401 ** None. 402 ** 403 ** Returns: 404 ** Nothing. 405 ** 406 ** Side Effects: 407 ** - Debug file is closed. 408 */ 409 void 410 DebugOff(signo) 411 int signo; 412 { 413 if (DbgFp != NULL) 414 (void) fclose(DbgFp); 415 416 DbgFp = NULL; 417 } 418 419 /* 420 ** DebugOn -- Turn on debugging. 421 ** 422 ** Parameters: 423 ** None. 424 ** 425 ** Returns: 426 ** Nothing. 427 ** 428 ** Side Effects: 429 ** - Debug file is opened/truncated if not already opened, 430 ** otherwise do nothing. 431 */ 432 void 433 DebugOn(signo) 434 int signo; 435 { 436 if (DbgFp == NULL) { 437 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 438 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 439 } 440 } 441