1 /* 2 * Copyright (c) 1988, 1992 The University of Utah and the Center 3 * for Software Science (CSS). 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Center for Software Science of the University of Utah Computer 9 * Science Department. CSS requests users of this software to return 10 * to css-dist@cs.utah.edu any improvements that they make and grant 11 * CSS redistribution rights. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93 38 * 39 * From: Utah Hdr: rbootd.c 3.1 92/07/06 40 * Author: Jeff Forys, University of Utah CSS 41 * 42 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved. 43 * @(#)rbootd.c 8.1 (Berkeley) 6/4/93 44 * $FreeBSD: src/libexec/rbootd/rbootd.c,v 1.11.2.1 2001/02/18 02:54:11 kris Exp $ 45 */ 46 47 #include <sys/param.h> 48 #include <sys/time.h> 49 #include <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <syslog.h> 58 #include <unistd.h> 59 #include "defs.h" 60 61 static void usage (void); 62 63 int 64 main(int argc, char *argv[]) 65 { 66 int c, fd, omask, maxfds; 67 fd_set rset; 68 69 /* 70 * Close any open file descriptors. 71 * Temporarily leave stdin & stdout open for `-d', 72 * and stderr open for any pre-syslog error messages. 73 */ 74 { 75 int i, nfds = getdtablesize(); 76 77 for (i = 0; i < nfds; i++) 78 if (i != fileno(stdin) && i != fileno(stdout) && 79 i != fileno(stderr)) 80 (void) close(i); 81 } 82 83 /* 84 * Parse any arguments. 85 */ 86 while ((c = getopt(argc, argv, "adi:")) != -1) 87 switch(c) { 88 case 'a': 89 BootAny++; 90 break; 91 case 'd': 92 DebugFlg++; 93 break; 94 case 'i': 95 IntfName = optarg; 96 break; 97 default: 98 usage(); 99 } 100 for (; optind < argc; optind++) { 101 if (ConfigFile == NULL) 102 ConfigFile = argv[optind]; 103 else { 104 warnx("too many config files (`%s' ignored)", 105 argv[optind]); 106 } 107 } 108 109 if (ConfigFile == NULL) /* use default config file */ 110 ConfigFile = DfltConfig; 111 112 if (DebugFlg) { 113 DbgFp = stdout; /* output to stdout */ 114 115 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 116 (void) signal(SIGUSR2, SIG_IGN); 117 (void) fclose(stderr); /* finished with it */ 118 } else { 119 if (daemon(0, 0)) 120 err(1, "can't detach from terminal"); 121 122 (void) signal(SIGUSR1, DebugOn); 123 (void) signal(SIGUSR2, DebugOff); 124 } 125 126 openlog("rbootd", LOG_PID, LOG_DAEMON); 127 128 /* 129 * If no interface was specified, get one now. 130 * 131 * This is convoluted because we want to get the default interface 132 * name for the syslog("restarted") message. If BpfGetIntfName() 133 * runs into an error, it will return a syslog-able error message 134 * (in `errmsg') which will be displayed here. 135 */ 136 if (IntfName == NULL) { 137 char *errmsg; 138 139 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 140 syslog(LOG_NOTICE, "restarted (?\?)"); 141 /* BpfGetIntfName() returns safe names, using %m */ 142 syslog(LOG_ERR, "%s", errmsg); 143 Exit(0); 144 } 145 } 146 147 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 148 149 (void) signal(SIGHUP, ReConfig); 150 (void) signal(SIGINT, Exit); 151 (void) signal(SIGTERM, Exit); 152 153 /* 154 * Grab our host name and pid. 155 */ 156 if (gethostname(MyHost, MAXHOSTNAMELEN - 1) < 0) { 157 syslog(LOG_ERR, "gethostname: %m"); 158 Exit(0); 159 } 160 MyHost[MAXHOSTNAMELEN - 1] = '\0'; 161 162 MyPid = getpid(); 163 164 /* 165 * Write proc's pid to a file. 166 */ 167 { 168 FILE *fp; 169 170 if ((fp = fopen(PidFile, "w")) != NULL) { 171 (void) fprintf(fp, "%d\n", (int) MyPid); 172 (void) fclose(fp); 173 } else { 174 syslog(LOG_WARNING, "fopen: failed (%s)", PidFile); 175 } 176 } 177 178 /* 179 * All boot files are relative to the boot directory, we might 180 * as well chdir() there to make life easier. 181 */ 182 if (chdir(BootDir) < 0) { 183 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 184 Exit(0); 185 } 186 187 /* 188 * Initial configuration. 189 */ 190 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 191 if (GetBootFiles() == 0) /* get list of boot files */ 192 Exit(0); 193 if (ParseConfig() == 0) /* parse config file */ 194 Exit(0); 195 196 /* 197 * Open and initialize a BPF device for the appropriate interface. 198 * If an error is encountered, a message is displayed and Exit() 199 * is called. 200 */ 201 fd = BpfOpen(); 202 203 (void) sigsetmask(omask); /* allow reconfig's */ 204 205 /* 206 * Main loop: receive a packet, determine where it came from, 207 * and if we service this host, call routine to handle request. 208 */ 209 maxfds = fd + 1; 210 FD_ZERO(&rset); 211 FD_SET(fd, &rset); 212 for (;;) { 213 struct timeval timeout; 214 fd_set r; 215 int nsel; 216 217 r = rset; 218 219 if (RmpConns == NULL) { /* timeout isnt necessary */ 220 nsel = select(maxfds, &r, NULL, NULL, NULL); 221 } else { 222 timeout.tv_sec = RMP_TIMEOUT; 223 timeout.tv_usec = 0; 224 nsel = select(maxfds, &r, NULL, NULL, &timeout); 225 } 226 227 if (nsel < 0) { 228 if (errno == EINTR) 229 continue; 230 syslog(LOG_ERR, "select: %m"); 231 Exit(0); 232 } else if (nsel == 0) { /* timeout */ 233 DoTimeout(); /* clear stale conns */ 234 continue; 235 } 236 237 if (FD_ISSET(fd, &r)) { 238 RMPCONN rconn; 239 CLIENT *client, *FindClient(); 240 int doread = 1; 241 242 while (BpfRead(&rconn, doread)) { 243 doread = 0; 244 245 if (DbgFp != NULL) /* display packet */ 246 DispPkt(&rconn,DIR_RCVD); 247 248 omask = sigblock(sigmask(SIGHUP)); 249 250 /* 251 * If we do not restrict service, set the 252 * client to NULL (ProcessPacket() handles 253 * this). Otherwise, check that we can 254 * service this host; if not, log a message 255 * and ignore the packet. 256 */ 257 if (BootAny) { 258 client = NULL; 259 } else if ((client=FindClient(&rconn))==NULL) { 260 syslog(LOG_INFO, 261 "%s: boot packet ignored", 262 EnetStr(&rconn)); 263 (void) sigsetmask(omask); 264 continue; 265 } 266 267 ProcessPacket(&rconn,client); 268 269 (void) sigsetmask(omask); 270 } 271 } 272 } 273 } 274 275 static void 276 usage(void) 277 { 278 fprintf(stderr, "usage: rbootd [-ad] [-i interface] [config_file]\n"); 279 exit (1); 280 } 281 282 /* 283 ** DoTimeout -- Free any connections that have timed out. 284 ** 285 ** Parameters: 286 ** None. 287 ** 288 ** Returns: 289 ** Nothing. 290 ** 291 ** Side Effects: 292 ** - Timed out connections in `RmpConns' will be freed. 293 */ 294 void 295 DoTimeout(void) 296 { 297 RMPCONN *rtmp; 298 struct timeval now; 299 300 (void) gettimeofday(&now, NULL); 301 302 /* 303 * For each active connection, if RMP_TIMEOUT seconds have passed 304 * since the last packet was sent, delete the connection. 305 */ 306 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 307 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 308 syslog(LOG_WARNING, "%s: connection timed out (%u)", 309 EnetStr(rtmp), rtmp->rmp.r_type); 310 RemoveConn(rtmp); 311 } 312 } 313 314 /* 315 ** FindClient -- Find client associated with a packet. 316 ** 317 ** Parameters: 318 ** rconn - the new packet. 319 ** 320 ** Returns: 321 ** Pointer to client info if found, NULL otherwise. 322 ** 323 ** Side Effects: 324 ** None. 325 ** 326 ** Warnings: 327 ** - This routine must be called with SIGHUP blocked since 328 ** a reconfigure can invalidate the information returned. 329 */ 330 331 CLIENT * 332 FindClient(RMPCONN *rconn) 333 { 334 CLIENT *ctmp; 335 336 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 337 if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 338 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 339 break; 340 341 return(ctmp); 342 } 343 344 /* 345 ** Exit -- Log an error message and exit. 346 ** 347 ** Parameters: 348 ** sig - caught signal (or zero if not dying on a signal). 349 ** 350 ** Returns: 351 ** Does not return. 352 ** 353 ** Side Effects: 354 ** - This process ceases to exist. 355 */ 356 void 357 Exit(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(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(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(int signo) 434 { 435 if (DbgFp == NULL) { 436 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 437 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 438 } 439 } 440