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. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * from: @(#)rbootd.c 8.1 (Berkeley) 6/4/93 42 * 43 * From: Utah Hdr: rbootd.c 3.1 92/07/06 44 * Author: Jeff Forys, University of Utah CSS 45 * 46 * @(#) Copyright (c) 1992, 1993 The Regents of the University of California. All rights reserved. 47 * @(#)rbootd.c 8.1 (Berkeley) 6/4/93 48 * $FreeBSD: src/libexec/rbootd/rbootd.c,v 1.11.2.1 2001/02/18 02:54:11 kris Exp $ 49 * $DragonFly: src/libexec/rbootd/rbootd.c,v 1.4 2006/03/18 19:43:18 swildner Exp $ 50 */ 51 52 #include <sys/param.h> 53 #include <sys/time.h> 54 #include <ctype.h> 55 #include <err.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <syslog.h> 63 #include <unistd.h> 64 #include "defs.h" 65 66 static void usage (void); 67 68 int 69 main(argc, argv) 70 int argc; 71 char *argv[]; 72 { 73 int c, fd, omask, maxfds; 74 fd_set rset; 75 76 /* 77 * Close any open file descriptors. 78 * Temporarily leave stdin & stdout open for `-d', 79 * and stderr open for any pre-syslog error messages. 80 */ 81 { 82 int i, nfds = getdtablesize(); 83 84 for (i = 0; i < nfds; i++) 85 if (i != fileno(stdin) && i != fileno(stdout) && 86 i != fileno(stderr)) 87 (void) close(i); 88 } 89 90 /* 91 * Parse any arguments. 92 */ 93 while ((c = getopt(argc, argv, "adi:")) != -1) 94 switch(c) { 95 case 'a': 96 BootAny++; 97 break; 98 case 'd': 99 DebugFlg++; 100 break; 101 case 'i': 102 IntfName = optarg; 103 break; 104 default: 105 usage(); 106 } 107 for (; optind < argc; optind++) { 108 if (ConfigFile == NULL) 109 ConfigFile = argv[optind]; 110 else { 111 warnx("too many config files (`%s' ignored)", 112 argv[optind]); 113 } 114 } 115 116 if (ConfigFile == NULL) /* use default config file */ 117 ConfigFile = DfltConfig; 118 119 if (DebugFlg) { 120 DbgFp = stdout; /* output to stdout */ 121 122 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 123 (void) signal(SIGUSR2, SIG_IGN); 124 (void) fclose(stderr); /* finished with it */ 125 } else { 126 if (daemon(0, 0)) 127 err(1, "can't detach from terminal"); 128 129 (void) signal(SIGUSR1, DebugOn); 130 (void) signal(SIGUSR2, DebugOff); 131 } 132 133 openlog("rbootd", LOG_PID, LOG_DAEMON); 134 135 /* 136 * If no interface was specified, get one now. 137 * 138 * This is convoluted because we want to get the default interface 139 * name for the syslog("restarted") message. If BpfGetIntfName() 140 * runs into an error, it will return a syslog-able error message 141 * (in `errmsg') which will be displayed here. 142 */ 143 if (IntfName == NULL) { 144 char *errmsg; 145 146 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 147 syslog(LOG_NOTICE, "restarted (?\?)"); 148 /* BpfGetIntfName() returns safe names, using %m */ 149 syslog(LOG_ERR, "%s", errmsg); 150 Exit(0); 151 } 152 } 153 154 syslog(LOG_NOTICE, "restarted (%s)", IntfName); 155 156 (void) signal(SIGHUP, ReConfig); 157 (void) signal(SIGINT, Exit); 158 (void) signal(SIGTERM, Exit); 159 160 /* 161 * Grab our host name and pid. 162 */ 163 if (gethostname(MyHost, MAXHOSTNAMELEN - 1) < 0) { 164 syslog(LOG_ERR, "gethostname: %m"); 165 Exit(0); 166 } 167 MyHost[MAXHOSTNAMELEN - 1] = '\0'; 168 169 MyPid = getpid(); 170 171 /* 172 * Write proc's pid to a file. 173 */ 174 { 175 FILE *fp; 176 177 if ((fp = fopen(PidFile, "w")) != NULL) { 178 (void) fprintf(fp, "%d\n", (int) MyPid); 179 (void) fclose(fp); 180 } else { 181 syslog(LOG_WARNING, "fopen: failed (%s)", PidFile); 182 } 183 } 184 185 /* 186 * All boot files are relative to the boot directory, we might 187 * as well chdir() there to make life easier. 188 */ 189 if (chdir(BootDir) < 0) { 190 syslog(LOG_ERR, "chdir: %m (%s)", BootDir); 191 Exit(0); 192 } 193 194 /* 195 * Initial configuration. 196 */ 197 omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */ 198 if (GetBootFiles() == 0) /* get list of boot files */ 199 Exit(0); 200 if (ParseConfig() == 0) /* parse config file */ 201 Exit(0); 202 203 /* 204 * Open and initialize a BPF device for the appropriate interface. 205 * If an error is encountered, a message is displayed and Exit() 206 * is called. 207 */ 208 fd = BpfOpen(); 209 210 (void) sigsetmask(omask); /* allow reconfig's */ 211 212 /* 213 * Main loop: receive a packet, determine where it came from, 214 * and if we service this host, call routine to handle request. 215 */ 216 maxfds = fd + 1; 217 FD_ZERO(&rset); 218 FD_SET(fd, &rset); 219 for (;;) { 220 struct timeval timeout; 221 fd_set r; 222 int nsel; 223 224 r = rset; 225 226 if (RmpConns == NULL) { /* timeout isnt necessary */ 227 nsel = select(maxfds, &r, NULL, NULL, NULL); 228 } else { 229 timeout.tv_sec = RMP_TIMEOUT; 230 timeout.tv_usec = 0; 231 nsel = select(maxfds, &r, NULL, NULL, &timeout); 232 } 233 234 if (nsel < 0) { 235 if (errno == EINTR) 236 continue; 237 syslog(LOG_ERR, "select: %m"); 238 Exit(0); 239 } else if (nsel == 0) { /* timeout */ 240 DoTimeout(); /* clear stale conns */ 241 continue; 242 } 243 244 if (FD_ISSET(fd, &r)) { 245 RMPCONN rconn; 246 CLIENT *client, *FindClient(); 247 int doread = 1; 248 249 while (BpfRead(&rconn, doread)) { 250 doread = 0; 251 252 if (DbgFp != NULL) /* display packet */ 253 DispPkt(&rconn,DIR_RCVD); 254 255 omask = sigblock(sigmask(SIGHUP)); 256 257 /* 258 * If we do not restrict service, set the 259 * client to NULL (ProcessPacket() handles 260 * this). Otherwise, check that we can 261 * service this host; if not, log a message 262 * and ignore the packet. 263 */ 264 if (BootAny) { 265 client = NULL; 266 } else if ((client=FindClient(&rconn))==NULL) { 267 syslog(LOG_INFO, 268 "%s: boot packet ignored", 269 EnetStr(&rconn)); 270 (void) sigsetmask(omask); 271 continue; 272 } 273 274 ProcessPacket(&rconn,client); 275 276 (void) sigsetmask(omask); 277 } 278 } 279 } 280 } 281 282 static void 283 usage() 284 { 285 fprintf(stderr, "usage: rbootd [-ad] [-i interface] [config_file]\n"); 286 exit (1); 287 } 288 289 /* 290 ** DoTimeout -- Free any connections that have timed out. 291 ** 292 ** Parameters: 293 ** None. 294 ** 295 ** Returns: 296 ** Nothing. 297 ** 298 ** Side Effects: 299 ** - Timed out connections in `RmpConns' will be freed. 300 */ 301 void 302 DoTimeout() 303 { 304 RMPCONN *rtmp; 305 struct timeval now; 306 307 (void) gettimeofday(&now, NULL); 308 309 /* 310 * For each active connection, if RMP_TIMEOUT seconds have passed 311 * since the last packet was sent, delete the connection. 312 */ 313 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 314 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 315 syslog(LOG_WARNING, "%s: connection timed out (%u)", 316 EnetStr(rtmp), rtmp->rmp.r_type); 317 RemoveConn(rtmp); 318 } 319 } 320 321 /* 322 ** FindClient -- Find client associated with a packet. 323 ** 324 ** Parameters: 325 ** rconn - the new packet. 326 ** 327 ** Returns: 328 ** Pointer to client info if found, NULL otherwise. 329 ** 330 ** Side Effects: 331 ** None. 332 ** 333 ** Warnings: 334 ** - This routine must be called with SIGHUP blocked since 335 ** a reconfigure can invalidate the information returned. 336 */ 337 338 CLIENT * 339 FindClient(rconn) 340 RMPCONN *rconn; 341 { 342 CLIENT *ctmp; 343 344 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 345 if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 346 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 347 break; 348 349 return(ctmp); 350 } 351 352 /* 353 ** Exit -- Log an error message and exit. 354 ** 355 ** Parameters: 356 ** sig - caught signal (or zero if not dying on a signal). 357 ** 358 ** Returns: 359 ** Does not return. 360 ** 361 ** Side Effects: 362 ** - This process ceases to exist. 363 */ 364 void 365 Exit(sig) 366 int sig; 367 { 368 if (sig > 0) 369 syslog(LOG_ERR, "going down on signal %d", sig); 370 else 371 syslog(LOG_ERR, "going down with fatal error"); 372 BpfClose(); 373 exit(1); 374 } 375 376 /* 377 ** ReConfig -- Get new list of boot files and reread config files. 378 ** 379 ** Parameters: 380 ** None. 381 ** 382 ** Returns: 383 ** Nothing. 384 ** 385 ** Side Effects: 386 ** - All active connections are dropped. 387 ** - List of boot-able files is changed. 388 ** - List of clients is changed. 389 ** 390 ** Warnings: 391 ** - This routine must be called with SIGHUP blocked. 392 */ 393 void 394 ReConfig(signo) 395 int signo; 396 { 397 syslog(LOG_NOTICE, "reconfiguring boot server"); 398 399 FreeConns(); 400 401 if (GetBootFiles() == 0) 402 Exit(0); 403 404 if (ParseConfig() == 0) 405 Exit(0); 406 } 407 408 /* 409 ** DebugOff -- Turn off debugging. 410 ** 411 ** Parameters: 412 ** None. 413 ** 414 ** Returns: 415 ** Nothing. 416 ** 417 ** Side Effects: 418 ** - Debug file is closed. 419 */ 420 void 421 DebugOff(signo) 422 int signo; 423 { 424 if (DbgFp != NULL) 425 (void) fclose(DbgFp); 426 427 DbgFp = NULL; 428 } 429 430 /* 431 ** DebugOn -- Turn on debugging. 432 ** 433 ** Parameters: 434 ** None. 435 ** 436 ** Returns: 437 ** Nothing. 438 ** 439 ** Side Effects: 440 ** - Debug file is opened/truncated if not already opened, 441 ** otherwise do nothing. 442 */ 443 void 444 DebugOn(signo) 445 int signo; 446 { 447 if (DbgFp == NULL) { 448 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 449 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 450 } 451 } 452