1 /* $NetBSD: rbootd.c,v 1.10 1999/06/06 03:11:40 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 #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 1.10 1999/06/06 03:11:40 thorpej 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(__progname, 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 syslog(LOG_NOTICE, "restarted (??)"); 162 syslog(LOG_ERR, errmsg); 163 Exit(0); 164 } 165 } 166 167 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 168 169 (void) signal(SIGHUP, ReConfig); 170 (void) signal(SIGINT, Exit); 171 (void) signal(SIGTERM, Exit); 172 173 /* 174 * Grab our host name and pid. 175 */ 176 if (gethostname(MyHost, sizeof MyHost) < 0) { 177 syslog(LOG_ERR, "gethostname: %m"); 178 Exit(0); 179 } 180 MyHost[sizeof(MyHost) - 1] = '\0'; 181 182 /* 183 * All boot files are relative to the boot directory, we might 184 * as well chdir() there to make life easier. 185 */ 186 if (chdir(BootDir) < 0) { 187 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 188 Exit(0); 189 } 190 191 /* 192 * Initial configuration. 193 */ 194 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 195 if (GetBootFiles() == 0) /* get list of boot files */ 196 Exit(0); 197 if (ParseConfig() == 0) /* parse config file */ 198 Exit(0); 199 200 /* 201 * Open and initialize a BPF device for the appropriate interface. 202 * If an error is encountered, a message is displayed and Exit() 203 * is called. 204 */ 205 fd = BpfOpen(); 206 207 (void) sigsetmask(omask); /* allow reconfig's */ 208 209 /* 210 * Main loop: receive a packet, determine where it came from, 211 * and if we service this host, call routine to handle request. 212 */ 213 maxfds = fd + 1; 214 FD_ZERO(&rset); 215 FD_SET(fd, &rset); 216 for (;;) { 217 struct timeval timeout; 218 fd_set r; 219 int nsel; 220 221 r = rset; 222 223 if (RmpConns == NULL) { /* timeout isnt necessary */ 224 nsel = select(maxfds, &r, NULL, NULL, NULL); 225 } else { 226 timeout.tv_sec = RMP_TIMEOUT; 227 timeout.tv_usec = 0; 228 nsel = select(maxfds, &r, NULL, NULL, &timeout); 229 } 230 231 if (nsel < 0) { 232 if (errno == EINTR) 233 continue; 234 syslog(LOG_ERR, "select: %m"); 235 Exit(0); 236 } else if (nsel == 0) { /* timeout */ 237 DoTimeout(); /* clear stale conns */ 238 continue; 239 } 240 241 if (FD_ISSET(fd, &r)) { 242 RMPCONN rconn; 243 CLIENT *client; 244 int doread = 1; 245 246 while (BpfRead(&rconn, doread)) { 247 doread = 0; 248 249 if (DbgFp != NULL) /* display packet */ 250 DispPkt(&rconn,DIR_RCVD); 251 252 omask = sigblock(sigmask(SIGHUP)); 253 254 /* 255 * If we do not restrict service, set the 256 * client to NULL (ProcessPacket() handles 257 * this). Otherwise, check that we can 258 * service this host; if not, log a message 259 * and ignore the packet. 260 */ 261 if (BootAny) { 262 client = NULL; 263 } else if ((client=FindClient(&rconn))==NULL) { 264 syslog(LOG_INFO, 265 "%s: boot packet ignored", 266 EnetStr(&rconn)); 267 (void) sigsetmask(omask); 268 continue; 269 } 270 271 ProcessPacket(&rconn,client); 272 273 (void) sigsetmask(omask); 274 } 275 } 276 } 277 } 278 279 /* 280 ** DoTimeout -- Free any connections that have timed out. 281 ** 282 ** Parameters: 283 ** None. 284 ** 285 ** Returns: 286 ** Nothing. 287 ** 288 ** Side Effects: 289 ** - Timed out connections in `RmpConns' will be freed. 290 */ 291 void 292 DoTimeout() 293 { 294 RMPCONN *rtmp; 295 struct timeval now; 296 297 (void) gettimeofday(&now, (struct timezone *)0); 298 299 /* 300 * For each active connection, if RMP_TIMEOUT seconds have passed 301 * since the last packet was sent, delete the connection. 302 */ 303 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 304 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 305 syslog(LOG_WARNING, "%s: connection timed out (%u)", 306 EnetStr(rtmp), rtmp->rmp.r_type); 307 RemoveConn(rtmp); 308 } 309 } 310 311 /* 312 ** FindClient -- Find client associated with a packet. 313 ** 314 ** Parameters: 315 ** rconn - the new packet. 316 ** 317 ** Returns: 318 ** Pointer to client info if found, NULL otherwise. 319 ** 320 ** Side Effects: 321 ** None. 322 ** 323 ** Warnings: 324 ** - This routine must be called with SIGHUP blocked since 325 ** a reconfigure can invalidate the information returned. 326 */ 327 328 CLIENT * 329 FindClient(rconn) 330 RMPCONN *rconn; 331 { 332 CLIENT *ctmp; 333 334 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 335 if (memcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 336 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 337 break; 338 339 return(ctmp); 340 } 341 342 /* 343 ** Exit -- Log an error message and exit. 344 ** 345 ** Parameters: 346 ** sig - caught signal (or zero if not dying on a signal). 347 ** 348 ** Returns: 349 ** Does not return. 350 ** 351 ** Side Effects: 352 ** - This process ceases to exist. 353 */ 354 void 355 Exit(sig) 356 int sig; 357 { 358 if (sig > 0) 359 syslog(LOG_ERR, "going down on signal %d", sig); 360 else 361 syslog(LOG_ERR, "going down with fatal error"); 362 BpfClose(); 363 exit(1); 364 } 365 366 /* 367 ** ReConfig -- Get new list of boot files and reread config files. 368 ** 369 ** Parameters: 370 ** None. 371 ** 372 ** Returns: 373 ** Nothing. 374 ** 375 ** Side Effects: 376 ** - All active connections are dropped. 377 ** - List of boot-able files is changed. 378 ** - List of clients is changed. 379 ** 380 ** Warnings: 381 ** - This routine must be called with SIGHUP blocked. 382 */ 383 void 384 ReConfig(signo) 385 int signo; 386 { 387 syslog(LOG_NOTICE, "reconfiguring boot server"); 388 389 FreeConns(); 390 391 if (GetBootFiles() == 0) 392 Exit(0); 393 394 if (ParseConfig() == 0) 395 Exit(0); 396 } 397 398 /* 399 ** DebugOff -- Turn off debugging. 400 ** 401 ** Parameters: 402 ** None. 403 ** 404 ** Returns: 405 ** Nothing. 406 ** 407 ** Side Effects: 408 ** - Debug file is closed. 409 */ 410 void 411 DebugOff(signo) 412 int signo; 413 { 414 if (DbgFp != NULL) 415 (void) fclose(DbgFp); 416 417 DbgFp = NULL; 418 } 419 420 /* 421 ** DebugOn -- Turn on debugging. 422 ** 423 ** Parameters: 424 ** None. 425 ** 426 ** Returns: 427 ** Nothing. 428 ** 429 ** Side Effects: 430 ** - Debug file is opened/truncated if not already opened, 431 ** otherwise do nothing. 432 */ 433 void 434 DebugOn(signo) 435 int signo; 436 { 437 if (DbgFp == NULL) { 438 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 439 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 440 } 441 } 442