1 /* $NetBSD: rbootd.c,v 1.18 2002/09/23 12:48:07 mycroft 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 1.18 2002/09/23 12:48:07 mycroft Exp $"); 61 #endif 62 #endif /* not lint */ 63 64 #include <sys/param.h> 65 #include <sys/time.h> 66 #include <poll.h> 67 #include <ctype.h> 68 #include <err.h> 69 #include <errno.h> 70 #include <fcntl.h> 71 #include <signal.h> 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 #include <syslog.h> 76 #include <unistd.h> 77 #include <util.h> 78 #include "defs.h" 79 80 int main __P((int, char *[])); 81 82 int 83 main(argc, argv) 84 int argc; 85 char *argv[]; 86 { 87 int c, fd, omask; 88 struct pollfd set[1]; 89 90 /* 91 * Close any open file descriptors. 92 * Temporarily leave stdin & stdout open for `-d', 93 * and stderr open for any pre-syslog error messages. 94 */ 95 { 96 int i, nfds = getdtablesize(); 97 98 for (i = 0; i < nfds; i++) 99 if (i != STDIN_FILENO && i != STDOUT_FILENO && 100 i != STDERR_FILENO) 101 (void) close(i); 102 } 103 104 /* 105 * Parse any arguments. 106 */ 107 while ((c = getopt(argc, argv, "adi:")) != -1) 108 switch(c) { 109 case 'a': 110 BootAny++; 111 break; 112 case 'd': 113 DebugFlg++; 114 break; 115 case 'i': 116 IntfName = optarg; 117 break; 118 } 119 for (; optind < argc; optind++) { 120 if (ConfigFile == NULL) 121 ConfigFile = argv[optind]; 122 else { 123 warnx("too many config files (`%s' ignored)", 124 argv[optind]); 125 } 126 } 127 128 if (ConfigFile == NULL) /* use default config file */ 129 ConfigFile = DfltConfig; 130 131 if (DebugFlg) { 132 DbgFp = stdout; /* output to stdout */ 133 134 (void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */ 135 (void) signal(SIGUSR2, SIG_IGN); 136 (void) fclose(stderr); /* finished with it */ 137 } else { 138 if (daemon(0, 0)) 139 err(1, "can't detach from terminal"); 140 pidfile(NULL); 141 142 (void) signal(SIGUSR1, DebugOn); 143 (void) signal(SIGUSR2, DebugOff); 144 } 145 146 openlog("rbootd", LOG_PID, LOG_DAEMON); 147 148 /* 149 * If no interface was specified, get one now. 150 * 151 * This is convoluted because we want to get the default interface 152 * name for the syslog("restarted") message. If BpfGetIntfName() 153 * runs into an error, it will return a syslog-able error message 154 * (in `errmsg') which will be displayed here. 155 */ 156 if (IntfName == NULL) { 157 char *errmsg; 158 159 if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) { 160 /* backslash to avoid trigraph ??) */ 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 set[0].fd = fd; 214 set[0].events = POLLIN; 215 for (;;) { 216 int nsel; 217 218 nsel = poll(set, 1, RmpConns ? RMP_TIMEOUT * 1000 : INFTIM); 219 220 if (nsel < 0) { 221 if (errno == EINTR) 222 continue; 223 syslog(LOG_ERR, "poll: %m"); 224 Exit(0); 225 } else if (nsel == 0) { /* timeout */ 226 DoTimeout(); /* clear stale conns */ 227 continue; 228 } 229 230 if (set[0].revents & POLLIN) { 231 RMPCONN rconn; 232 CLIENT *client; 233 int doread = 1; 234 235 while (BpfRead(&rconn, doread)) { 236 doread = 0; 237 238 if (DbgFp != NULL) /* display packet */ 239 DispPkt(&rconn,DIR_RCVD); 240 241 omask = sigblock(sigmask(SIGHUP)); 242 243 /* 244 * If we do not restrict service, set the 245 * client to NULL (ProcessPacket() handles 246 * this). Otherwise, check that we can 247 * service this host; if not, log a message 248 * and ignore the packet. 249 */ 250 if (BootAny) { 251 client = NULL; 252 } else if ((client=FindClient(&rconn))==NULL) { 253 syslog(LOG_INFO, 254 "%s: boot packet ignored", 255 EnetStr(&rconn)); 256 (void) sigsetmask(omask); 257 continue; 258 } 259 260 ProcessPacket(&rconn,client); 261 262 (void) sigsetmask(omask); 263 } 264 } 265 } 266 } 267 268 /* 269 ** DoTimeout -- Free any connections that have timed out. 270 ** 271 ** Parameters: 272 ** None. 273 ** 274 ** Returns: 275 ** Nothing. 276 ** 277 ** Side Effects: 278 ** - Timed out connections in `RmpConns' will be freed. 279 */ 280 void 281 DoTimeout() 282 { 283 RMPCONN *rtmp; 284 struct timeval now; 285 286 (void) gettimeofday(&now, (struct timezone *)0); 287 288 /* 289 * For each active connection, if RMP_TIMEOUT seconds have passed 290 * since the last packet was sent, delete the connection. 291 */ 292 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next) 293 if ((rtmp->tstamp.tv_sec + RMP_TIMEOUT) < now.tv_sec) { 294 syslog(LOG_WARNING, "%s: connection timed out (%u)", 295 EnetStr(rtmp), rtmp->rmp.r_type); 296 RemoveConn(rtmp); 297 } 298 } 299 300 /* 301 ** FindClient -- Find client associated with a packet. 302 ** 303 ** Parameters: 304 ** rconn - the new packet. 305 ** 306 ** Returns: 307 ** Pointer to client info if found, NULL otherwise. 308 ** 309 ** Side Effects: 310 ** None. 311 ** 312 ** Warnings: 313 ** - This routine must be called with SIGHUP blocked since 314 ** a reconfigure can invalidate the information returned. 315 */ 316 317 CLIENT * 318 FindClient(rconn) 319 RMPCONN *rconn; 320 { 321 CLIENT *ctmp; 322 323 for (ctmp = Clients; ctmp != NULL; ctmp = ctmp->next) 324 if (memcmp((char *)&rconn->rmp.hp_hdr.saddr[0], 325 (char *)&ctmp->addr[0], RMP_ADDRLEN) == 0) 326 break; 327 328 return(ctmp); 329 } 330 331 /* 332 ** Exit -- Log an error message and exit. 333 ** 334 ** Parameters: 335 ** sig - caught signal (or zero if not dying on a signal). 336 ** 337 ** Returns: 338 ** Does not return. 339 ** 340 ** Side Effects: 341 ** - This process ceases to exist. 342 */ 343 void 344 Exit(sig) 345 int sig; 346 { 347 if (sig > 0) 348 syslog(LOG_ERR, "going down on signal %d", sig); 349 else 350 syslog(LOG_ERR, "going down with fatal error"); 351 BpfClose(); 352 exit(1); 353 } 354 355 /* 356 ** ReConfig -- Get new list of boot files and reread config files. 357 ** 358 ** Parameters: 359 ** None. 360 ** 361 ** Returns: 362 ** Nothing. 363 ** 364 ** Side Effects: 365 ** - All active connections are dropped. 366 ** - List of boot-able files is changed. 367 ** - List of clients is changed. 368 ** 369 ** Warnings: 370 ** - This routine must be called with SIGHUP blocked. 371 */ 372 void 373 ReConfig(signo) 374 int signo; 375 { 376 syslog(LOG_NOTICE, "reconfiguring boot server"); 377 378 FreeConns(); 379 380 if (GetBootFiles() == 0) 381 Exit(0); 382 383 if (ParseConfig() == 0) 384 Exit(0); 385 } 386 387 /* 388 ** DebugOff -- Turn off debugging. 389 ** 390 ** Parameters: 391 ** None. 392 ** 393 ** Returns: 394 ** Nothing. 395 ** 396 ** Side Effects: 397 ** - Debug file is closed. 398 */ 399 void 400 DebugOff(signo) 401 int signo; 402 { 403 if (DbgFp != NULL) 404 (void) fclose(DbgFp); 405 406 DbgFp = NULL; 407 } 408 409 /* 410 ** DebugOn -- Turn on debugging. 411 ** 412 ** Parameters: 413 ** None. 414 ** 415 ** Returns: 416 ** Nothing. 417 ** 418 ** Side Effects: 419 ** - Debug file is opened/truncated if not already opened, 420 ** otherwise do nothing. 421 */ 422 void 423 DebugOn(signo) 424 int signo; 425 { 426 if (DbgFp == NULL) { 427 if ((DbgFp = fopen(DbgFile, "w")) == NULL) 428 syslog(LOG_ERR, "can't open debug file (%s)", DbgFile); 429 } 430 } 431