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 * @(#)rmpproto.c 8.1 (Berkeley) 6/4/93 42 * 43 * Utah $Hdr: rmpproto.c 3.1 92/07/06$ 44 * Author: Jeff Forys, University of Utah CSS 45 */ 46 47 #ifndef lint 48 static char sccsid[] = "@(#)rmpproto.c 8.1 (Berkeley) 6/4/93"; 49 #endif /* not lint */ 50 51 #include <sys/param.h> 52 #include <sys/time.h> 53 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <stdio.h> 57 #include <string.h> 58 #include <syslog.h> 59 #include <unistd.h> 60 #include "defs.h" 61 62 /* 63 ** ProcessPacket -- determine packet type and do what's required. 64 ** 65 ** An RMP BOOT packet has been received. Look at the type field 66 ** and process Boot Requests, Read Requests, and Boot Complete 67 ** packets. Any other type will be dropped with a warning msg. 68 ** 69 ** Parameters: 70 ** rconn - the new connection 71 ** client - list of files available to this host 72 ** 73 ** Returns: 74 ** Nothing. 75 ** 76 ** Side Effects: 77 ** - If this is a valid boot request, it will be added to 78 ** the linked list of outstanding requests (RmpConns). 79 ** - If this is a valid boot complete, its associated 80 ** entry in RmpConns will be deleted. 81 ** - Also, unless we run out of memory, a reply will be 82 ** sent to the host that sent the packet. 83 */ 84 void 85 ProcessPacket(rconn, client) 86 RMPCONN *rconn; 87 CLIENT *client; 88 { 89 struct rmp_packet *rmp; 90 RMPCONN *rconnout; 91 92 rmp = &rconn->rmp; /* cache pointer to RMP packet */ 93 94 switch(rmp->r_type) { /* do what we came here to do */ 95 case RMP_BOOT_REQ: /* boot request */ 96 if ((rconnout = NewConn(rconn)) == NULL) 97 return; 98 99 /* 100 * If the Session ID is 0xffff, this is a "probe" 101 * packet and we do not want to add the connection 102 * to the linked list of active connections. There 103 * are two types of probe packets, if the Sequence 104 * Number is 0 they want to know our host name, o/w 105 * they want the name of the file associated with 106 * the number spec'd by the Sequence Number. 107 * 108 * If this is an actual boot request, open the file 109 * and send a reply. If SendBootRepl() does not 110 * return 0, add the connection to the linked list 111 * of active connections, otherwise delete it since 112 * an error was encountered. 113 */ 114 if (rmp->r_brq.rmp_session == RMP_PROBESID) { 115 if (WORDZE(rmp->r_brq.rmp_seqno)) 116 (void) SendServerID(rconnout); 117 else 118 (void) SendFileNo(rmp, rconnout, 119 client? client->files: 120 BootFiles); 121 FreeConn(rconnout); 122 } else { 123 if (SendBootRepl(rmp, rconnout, 124 client? client->files: BootFiles)) 125 AddConn(rconnout); 126 else 127 FreeConn(rconnout); 128 } 129 break; 130 131 case RMP_BOOT_REPL: /* boot reply (not valid) */ 132 syslog(LOG_WARNING, "%s: sent a boot reply", 133 EnetStr(rconn)); 134 break; 135 136 case RMP_READ_REQ: /* read request */ 137 /* 138 * Send a portion of the boot file. 139 */ 140 (void) SendReadRepl(rconn); 141 break; 142 143 case RMP_READ_REPL: /* read reply (not valid) */ 144 syslog(LOG_WARNING, "%s: sent a read reply", 145 EnetStr(rconn)); 146 break; 147 148 case RMP_BOOT_DONE: /* boot complete */ 149 /* 150 * Remove the entry from the linked list of active 151 * connections. 152 */ 153 (void) BootDone(rconn); 154 break; 155 156 default: /* unknown RMP packet type */ 157 syslog(LOG_WARNING, "%s: unknown packet type (%u)", 158 EnetStr(rconn), rmp->r_type); 159 } 160 } 161 162 /* 163 ** SendServerID -- send our host name to who ever requested it. 164 ** 165 ** Parameters: 166 ** rconn - the reply packet to be formatted. 167 ** 168 ** Returns: 169 ** 1 on success, 0 on failure. 170 ** 171 ** Side Effects: 172 ** none. 173 */ 174 int 175 SendServerID(rconn) 176 RMPCONN *rconn; 177 { 178 register struct rmp_packet *rpl; 179 register char *src, *dst; 180 register u_char *size; 181 182 rpl = &rconn->rmp; /* cache ptr to RMP packet */ 183 184 /* 185 * Set up assorted fields in reply packet. 186 */ 187 rpl->r_brpl.rmp_type = RMP_BOOT_REPL; 188 rpl->r_brpl.rmp_retcode = RMP_E_OKAY; 189 ZEROWORD(rpl->r_brpl.rmp_seqno); 190 rpl->r_brpl.rmp_session = 0; 191 rpl->r_brpl.rmp_version = RMP_VERSION; 192 193 size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of host name */ 194 195 /* 196 * Copy our host name into the reply packet incrementing the 197 * length as we go. Stop at RMP_HOSTLEN or the first dot. 198 */ 199 src = MyHost; 200 dst = (char *) &rpl->r_brpl.rmp_flnm; 201 for (*size = 0; *size < RMP_HOSTLEN; (*size)++) { 202 if (*src == '.' || *src == '\0') 203 break; 204 *dst++ = *src++; 205 } 206 207 rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */ 208 209 return(SendPacket(rconn)); /* send packet */ 210 } 211 212 /* 213 ** SendFileNo -- send the name of a bootable file to the requester. 214 ** 215 ** Parameters: 216 ** req - RMP BOOT packet containing the request. 217 ** rconn - the reply packet to be formatted. 218 ** filelist - list of files available to the requester. 219 ** 220 ** Returns: 221 ** 1 on success, 0 on failure. 222 ** 223 ** Side Effects: 224 ** none. 225 */ 226 int 227 SendFileNo(req, rconn, filelist) 228 struct rmp_packet *req; 229 RMPCONN *rconn; 230 char *filelist[]; 231 { 232 register struct rmp_packet *rpl; 233 register char *src, *dst; 234 register u_char *size, i; 235 236 GETWORD(req->r_brpl.rmp_seqno, i); /* SeqNo is really FileNo */ 237 rpl = &rconn->rmp; /* cache ptr to RMP packet */ 238 239 /* 240 * Set up assorted fields in reply packet. 241 */ 242 rpl->r_brpl.rmp_type = RMP_BOOT_REPL; 243 PUTWORD(i, rpl->r_brpl.rmp_seqno); 244 i--; 245 rpl->r_brpl.rmp_session = 0; 246 rpl->r_brpl.rmp_version = RMP_VERSION; 247 248 size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of filename */ 249 *size = 0; /* init length to zero */ 250 251 /* 252 * Copy the file name into the reply packet incrementing the 253 * length as we go. Stop at end of string or when RMPBOOTDATA 254 * characters have been copied. Also, set return code to 255 * indicate success or "no more files". 256 */ 257 if (i < C_MAXFILE && filelist[i] != NULL) { 258 src = filelist[i]; 259 dst = (char *)&rpl->r_brpl.rmp_flnm; 260 for (; *src && *size < RMPBOOTDATA; (*size)++) { 261 if (*src == '\0') 262 break; 263 *dst++ = *src++; 264 } 265 rpl->r_brpl.rmp_retcode = RMP_E_OKAY; 266 } else 267 rpl->r_brpl.rmp_retcode = RMP_E_NODFLT; 268 269 rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */ 270 271 return(SendPacket(rconn)); /* send packet */ 272 } 273 274 /* 275 ** SendBootRepl -- open boot file and respond to boot request. 276 ** 277 ** Parameters: 278 ** req - RMP BOOT packet containing the request. 279 ** rconn - the reply packet to be formatted. 280 ** filelist - list of files available to the requester. 281 ** 282 ** Returns: 283 ** 1 on success, 0 on failure. 284 ** 285 ** Side Effects: 286 ** none. 287 */ 288 int 289 SendBootRepl(req, rconn, filelist) 290 struct rmp_packet *req; 291 RMPCONN *rconn; 292 char *filelist[]; 293 { 294 int retval; 295 char *filename, filepath[RMPBOOTDATA+1]; 296 RMPCONN *oldconn; 297 register struct rmp_packet *rpl; 298 register char *src, *dst1, *dst2; 299 register u_char i; 300 301 /* 302 * If another connection already exists, delete it since we 303 * are obviously starting again. 304 */ 305 if ((oldconn = FindConn(rconn)) != NULL) { 306 syslog(LOG_WARNING, "%s: dropping existing connection", 307 EnetStr(oldconn)); 308 RemoveConn(oldconn); 309 } 310 311 rpl = &rconn->rmp; /* cache ptr to RMP packet */ 312 313 /* 314 * Set up assorted fields in reply packet. 315 */ 316 rpl->r_brpl.rmp_type = RMP_BOOT_REPL; 317 COPYWORD(req->r_brq.rmp_seqno, rpl->r_brpl.rmp_seqno); 318 rpl->r_brpl.rmp_session = GenSessID(); 319 rpl->r_brpl.rmp_version = RMP_VERSION; 320 rpl->r_brpl.rmp_flnmsize = req->r_brq.rmp_flnmsize; 321 322 /* 323 * Copy file name to `filepath' string, and into reply packet. 324 */ 325 src = &req->r_brq.rmp_flnm; 326 dst1 = filepath; 327 dst2 = &rpl->r_brpl.rmp_flnm; 328 for (i = 0; i < req->r_brq.rmp_flnmsize; i++) 329 *dst1++ = *dst2++ = *src++; 330 *dst1 = '\0'; 331 332 /* 333 * If we are booting HP-UX machines, their secondary loader will 334 * ask for files like "/hp-ux". As a security measure, we do not 335 * allow boot files to lay outside the boot directory (unless they 336 * are purposely link'd out. So, make `filename' become the path- 337 * stripped file name and spoof the client into thinking that it 338 * really got what it wanted. 339 */ 340 filename = (filename = rindex(filepath,'/'))? ++filename: filepath; 341 342 /* 343 * Check that this is a valid boot file name. 344 */ 345 for (i = 0; i < C_MAXFILE && filelist[i] != NULL; i++) 346 if (STREQN(filename, filelist[i])) 347 goto match; 348 349 /* 350 * Invalid boot file name, set error and send reply packet. 351 */ 352 rpl->r_brpl.rmp_retcode = RMP_E_NOFILE; 353 retval = 0; 354 goto sendpkt; 355 356 match: 357 /* 358 * This is a valid boot file. Open the file and save the file 359 * descriptor associated with this connection and set success 360 * indication. If the file couldnt be opened, set error: 361 * "no such file or dir" - RMP_E_NOFILE 362 * "file table overflow" - RMP_E_BUSY 363 * "too many open files" - RMP_E_BUSY 364 * anything else - RMP_E_OPENFILE 365 */ 366 if ((rconn->bootfd = open(filename, O_RDONLY, 0600)) < 0) { 367 rpl->r_brpl.rmp_retcode = (errno == ENOENT)? RMP_E_NOFILE: 368 (errno == EMFILE || errno == ENFILE)? RMP_E_BUSY: 369 RMP_E_OPENFILE; 370 retval = 0; 371 } else { 372 rpl->r_brpl.rmp_retcode = RMP_E_OKAY; 373 retval = 1; 374 } 375 376 sendpkt: 377 syslog(LOG_INFO, "%s: request to boot %s (%s)", 378 EnetStr(rconn), filename, retval? "granted": "denied"); 379 380 rconn->rmplen = RMPBOOTSIZE(rpl->r_brpl.rmp_flnmsize); 381 382 return (retval & SendPacket(rconn)); 383 } 384 385 /* 386 ** SendReadRepl -- send a portion of the boot file to the requester. 387 ** 388 ** Parameters: 389 ** rconn - the reply packet to be formatted. 390 ** 391 ** Returns: 392 ** 1 on success, 0 on failure. 393 ** 394 ** Side Effects: 395 ** none. 396 */ 397 int 398 SendReadRepl(rconn) 399 RMPCONN *rconn; 400 { 401 int retval; 402 RMPCONN *oldconn; 403 register struct rmp_packet *rpl, *req; 404 register int size = 0; 405 int madeconn = 0; 406 407 /* 408 * Find the old connection. If one doesnt exist, create one only 409 * to return the error code. 410 */ 411 if ((oldconn = FindConn(rconn)) == NULL) { 412 if ((oldconn = NewConn(rconn)) == NULL) 413 return(0); 414 syslog(LOG_ERR, "SendReadRepl: no active connection (%s)", 415 EnetStr(rconn)); 416 madeconn++; 417 } 418 419 req = &rconn->rmp; /* cache ptr to request packet */ 420 rpl = &oldconn->rmp; /* cache ptr to reply packet */ 421 422 if (madeconn) { /* no active connection above; abort */ 423 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT; 424 retval = 1; 425 goto sendpkt; 426 } 427 428 /* 429 * Make sure Session ID's match. 430 */ 431 if (req->r_rrq.rmp_session != 432 ((rpl->r_type == RMP_BOOT_REPL)? rpl->r_brpl.rmp_session: 433 rpl->r_rrpl.rmp_session)) { 434 syslog(LOG_ERR, "SendReadRepl: bad session id (%s)", 435 EnetStr(rconn)); 436 rpl->r_rrpl.rmp_retcode = RMP_E_BADSID; 437 retval = 1; 438 goto sendpkt; 439 } 440 441 /* 442 * If the requester asks for more data than we can fit, 443 * silently clamp the request size down to RMPREADDATA. 444 * 445 * N.B. I do not know if this is "legal", however it seems 446 * to work. This is necessary for bpfwrite() on machines 447 * with MCLBYTES less than 1514. 448 */ 449 if (req->r_rrq.rmp_size > RMPREADDATA) 450 req->r_rrq.rmp_size = RMPREADDATA; 451 452 /* 453 * Position read head on file according to info in request packet. 454 */ 455 GETWORD(req->r_rrq.rmp_offset, size); 456 if (lseek(oldconn->bootfd, (off_t)size, L_SET) < 0) { 457 syslog(LOG_ERR, "SendReadRepl: lseek: %m (%s)", 458 EnetStr(rconn)); 459 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT; 460 retval = 1; 461 goto sendpkt; 462 } 463 464 /* 465 * Read data directly into reply packet. 466 */ 467 if ((size = read(oldconn->bootfd, &rpl->r_rrpl.rmp_data, 468 (int) req->r_rrq.rmp_size)) <= 0) { 469 if (size < 0) { 470 syslog(LOG_ERR, "SendReadRepl: read: %m (%s)", 471 EnetStr(rconn)); 472 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT; 473 } else { 474 rpl->r_rrpl.rmp_retcode = RMP_E_EOF; 475 } 476 retval = 1; 477 goto sendpkt; 478 } 479 480 /* 481 * Set success indication. 482 */ 483 rpl->r_rrpl.rmp_retcode = RMP_E_OKAY; 484 485 sendpkt: 486 /* 487 * Set up assorted fields in reply packet. 488 */ 489 rpl->r_rrpl.rmp_type = RMP_READ_REPL; 490 COPYWORD(req->r_rrq.rmp_offset, rpl->r_rrpl.rmp_offset); 491 rpl->r_rrpl.rmp_session = req->r_rrq.rmp_session; 492 493 oldconn->rmplen = RMPREADSIZE(size); /* set size of packet */ 494 495 retval &= SendPacket(oldconn); /* send packet */ 496 497 if (madeconn) /* clean up after ourself */ 498 FreeConn(oldconn); 499 500 return (retval); 501 } 502 503 /* 504 ** BootDone -- free up memory allocated for a connection. 505 ** 506 ** Parameters: 507 ** rconn - incoming boot complete packet. 508 ** 509 ** Returns: 510 ** 1 on success, 0 on failure. 511 ** 512 ** Side Effects: 513 ** none. 514 */ 515 int 516 BootDone(rconn) 517 RMPCONN *rconn; 518 { 519 RMPCONN *oldconn; 520 struct rmp_packet *rpl; 521 522 /* 523 * If we cant find the connection, ignore the request. 524 */ 525 if ((oldconn = FindConn(rconn)) == NULL) { 526 syslog(LOG_ERR, "BootDone: no existing connection (%s)", 527 EnetStr(rconn)); 528 return(0); 529 } 530 531 rpl = &oldconn->rmp; /* cache ptr to RMP packet */ 532 533 /* 534 * Make sure Session ID's match. 535 */ 536 if (rconn->rmp.r_rrq.rmp_session != 537 ((rpl->r_type == RMP_BOOT_REPL)? rpl->r_brpl.rmp_session: 538 rpl->r_rrpl.rmp_session)) { 539 syslog(LOG_ERR, "BootDone: bad session id (%s)", 540 EnetStr(rconn)); 541 return(0); 542 } 543 544 RemoveConn(oldconn); /* remove connection */ 545 546 syslog(LOG_INFO, "%s: boot complete", EnetStr(rconn)); 547 548 return(1); 549 } 550 551 /* 552 ** SendPacket -- send an RMP packet to a remote host. 553 ** 554 ** Parameters: 555 ** rconn - packet to be sent. 556 ** 557 ** Returns: 558 ** 1 on success, 0 on failure. 559 ** 560 ** Side Effects: 561 ** none. 562 */ 563 int 564 SendPacket(rconn) 565 register RMPCONN *rconn; 566 { 567 /* 568 * Set Ethernet Destination address to Source (BPF and the enet 569 * driver will take care of getting our source address set). 570 */ 571 bcopy((char *)&rconn->rmp.hp_hdr.saddr[0], 572 (char *)&rconn->rmp.hp_hdr.daddr[0], RMP_ADDRLEN); 573 rconn->rmp.hp_hdr.len = rconn->rmplen - sizeof(struct hp_hdr); 574 575 /* 576 * Reverse 802.2/HP Extended Source & Destination Access Pts. 577 */ 578 rconn->rmp.hp_llc.dxsap = HPEXT_SXSAP; 579 rconn->rmp.hp_llc.sxsap = HPEXT_DXSAP; 580 581 /* 582 * Last time this connection was active. 583 */ 584 (void) gettimeofday(&rconn->tstamp, (struct timezone *)0); 585 586 if (DbgFp != NULL) /* display packet */ 587 DispPkt(rconn,DIR_SENT); 588 589 /* 590 * Send RMP packet to remote host. 591 */ 592 return(BpfWrite(rconn)); 593 } 594