1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: @(#)rmpproto.c 8.1 (Berkeley) 6/4/93 40 * 41 * From: Utah Hdr: rmpproto.c 3.1 92/07/06 42 * Author: Jeff Forys, University of Utah CSS 43 */ 44 45 #ifndef lint 46 #if 0 47 static const char sccsid[] = "@(#)rmpproto.c 8.1 (Berkeley) 6/4/93"; 48 #endif 49 static const char rcsid[] = 50 "$FreeBSD$"; 51 #endif /* not lint */ 52 53 #include <sys/param.h> 54 #include <sys/time.h> 55 #include <netinet/in.h> 56 57 #include <errno.h> 58 #include <fcntl.h> 59 #include <stdio.h> 60 #include <string.h> 61 #include <syslog.h> 62 #include <unistd.h> 63 #include "defs.h" 64 65 /* 66 ** ProcessPacket -- determine packet type and do what's required. 67 ** 68 ** An RMP BOOT packet has been received. Look at the type field 69 ** and process Boot Requests, Read Requests, and Boot Complete 70 ** packets. Any other type will be dropped with a warning msg. 71 ** 72 ** Parameters: 73 ** rconn - the new connection 74 ** client - list of files available to this host 75 ** 76 ** Returns: 77 ** Nothing. 78 ** 79 ** Side Effects: 80 ** - If this is a valid boot request, it will be added to 81 ** the linked list of outstanding requests (RmpConns). 82 ** - If this is a valid boot complete, its associated 83 ** entry in RmpConns will be deleted. 84 ** - Also, unless we run out of memory, a reply will be 85 ** sent to the host that sent the packet. 86 */ 87 void 88 ProcessPacket(RMPCONN *rconn, CLIENT *client) 89 { 90 struct rmp_packet *rmp; 91 RMPCONN *rconnout; 92 93 rmp = &rconn->rmp; /* cache pointer to RMP packet */ 94 95 switch(rmp->r_type) { /* do what we came here to do */ 96 case RMP_BOOT_REQ: /* boot request */ 97 if ((rconnout = NewConn(rconn)) == NULL) 98 return; 99 100 /* 101 * If the Session ID is 0xffff, this is a "probe" 102 * packet and we do not want to add the connection 103 * to the linked list of active connections. There 104 * are two types of probe packets, if the Sequence 105 * Number is 0 they want to know our host name, o/w 106 * they want the name of the file associated with 107 * the number spec'd by the Sequence Number. 108 * 109 * If this is an actual boot request, open the file 110 * and send a reply. If SendBootRepl() does not 111 * return 0, add the connection to the linked list 112 * of active connections, otherwise delete it since 113 * an error was encountered. 114 */ 115 if (ntohs(rmp->r_brq.rmp_session) == RMP_PROBESID) { 116 if (WORDZE(rmp->r_brq.rmp_seqno)) 117 (void) SendServerID(rconnout); 118 else 119 (void) SendFileNo(rmp, rconnout, 120 client? client->files: 121 BootFiles); 122 FreeConn(rconnout); 123 } else { 124 if (SendBootRepl(rmp, rconnout, 125 client? client->files: BootFiles)) 126 AddConn(rconnout); 127 else 128 FreeConn(rconnout); 129 } 130 break; 131 132 case RMP_BOOT_REPL: /* boot reply (not valid) */ 133 syslog(LOG_WARNING, "%s: sent a boot reply", 134 EnetStr(rconn)); 135 break; 136 137 case RMP_READ_REQ: /* read request */ 138 /* 139 * Send a portion of the boot file. 140 */ 141 (void) SendReadRepl(rconn); 142 break; 143 144 case RMP_READ_REPL: /* read reply (not valid) */ 145 syslog(LOG_WARNING, "%s: sent a read reply", 146 EnetStr(rconn)); 147 break; 148 149 case RMP_BOOT_DONE: /* boot complete */ 150 /* 151 * Remove the entry from the linked list of active 152 * connections. 153 */ 154 (void) BootDone(rconn); 155 break; 156 157 default: /* unknown RMP packet type */ 158 syslog(LOG_WARNING, "%s: unknown packet type (%u)", 159 EnetStr(rconn), rmp->r_type); 160 } 161 } 162 163 /* 164 ** SendServerID -- send our host name to who ever requested it. 165 ** 166 ** Parameters: 167 ** rconn - the reply packet to be formatted. 168 ** 169 ** Returns: 170 ** 1 on success, 0 on failure. 171 ** 172 ** Side Effects: 173 ** none. 174 */ 175 int 176 SendServerID(RMPCONN *rconn) 177 { 178 struct rmp_packet *rpl; 179 char *src, *dst; 180 u_int8_t *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 = htons(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(struct rmp_packet *req, RMPCONN *rconn, char *filelist[]) 228 { 229 struct rmp_packet *rpl; 230 char *src, *dst; 231 u_int8_t *size; 232 int i; 233 234 GETWORD(req->r_brpl.rmp_seqno, i); /* SeqNo is really FileNo */ 235 rpl = &rconn->rmp; /* cache ptr to RMP packet */ 236 237 /* 238 * Set up assorted fields in reply packet. 239 */ 240 rpl->r_brpl.rmp_type = RMP_BOOT_REPL; 241 PUTWORD(i, rpl->r_brpl.rmp_seqno); 242 i--; 243 rpl->r_brpl.rmp_session = 0; 244 rpl->r_brpl.rmp_version = htons(RMP_VERSION); 245 246 size = &rpl->r_brpl.rmp_flnmsize; /* ptr to length of filename */ 247 *size = 0; /* init length to zero */ 248 249 /* 250 * Copy the file name into the reply packet incrementing the 251 * length as we go. Stop at end of string or when RMPBOOTDATA 252 * characters have been copied. Also, set return code to 253 * indicate success or "no more files". 254 */ 255 if (i < C_MAXFILE && filelist[i] != NULL) { 256 src = filelist[i]; 257 dst = (char *)&rpl->r_brpl.rmp_flnm; 258 for (; *src && *size < RMPBOOTDATA; (*size)++) { 259 if (*src == '\0') 260 break; 261 *dst++ = *src++; 262 } 263 rpl->r_brpl.rmp_retcode = RMP_E_OKAY; 264 } else 265 rpl->r_brpl.rmp_retcode = RMP_E_NODFLT; 266 267 rconn->rmplen = RMPBOOTSIZE(*size); /* set packet length */ 268 269 return(SendPacket(rconn)); /* send packet */ 270 } 271 272 /* 273 ** SendBootRepl -- open boot file and respond to boot request. 274 ** 275 ** Parameters: 276 ** req - RMP BOOT packet containing the request. 277 ** rconn - the reply packet to be formatted. 278 ** filelist - list of files available to the requester. 279 ** 280 ** Returns: 281 ** 1 on success, 0 on failure. 282 ** 283 ** Side Effects: 284 ** none. 285 */ 286 int 287 SendBootRepl(struct rmp_packet *req, RMPCONN *rconn, char *filelist[]) 288 { 289 int retval; 290 char *filename, filepath[RMPBOOTDATA+1]; 291 RMPCONN *oldconn; 292 struct rmp_packet *rpl; 293 char *src, *dst1, *dst2; 294 u_int8_t i; 295 296 /* 297 * If another connection already exists, delete it since we 298 * are obviously starting again. 299 */ 300 if ((oldconn = FindConn(rconn)) != NULL) { 301 syslog(LOG_WARNING, "%s: dropping existing connection", 302 EnetStr(oldconn)); 303 RemoveConn(oldconn); 304 } 305 306 rpl = &rconn->rmp; /* cache ptr to RMP packet */ 307 308 /* 309 * Set up assorted fields in reply packet. 310 */ 311 rpl->r_brpl.rmp_type = RMP_BOOT_REPL; 312 COPYWORD(req->r_brq.rmp_seqno, rpl->r_brpl.rmp_seqno); 313 rpl->r_brpl.rmp_session = htons(GenSessID()); 314 rpl->r_brpl.rmp_version = htons(RMP_VERSION); 315 rpl->r_brpl.rmp_flnmsize = req->r_brq.rmp_flnmsize; 316 317 /* 318 * Copy file name to `filepath' string, and into reply packet. 319 */ 320 src = &req->r_brq.rmp_flnm; 321 dst1 = filepath; 322 dst2 = &rpl->r_brpl.rmp_flnm; 323 for (i = 0; i < req->r_brq.rmp_flnmsize; i++) 324 *dst1++ = *dst2++ = *src++; 325 *dst1 = '\0'; 326 327 /* 328 * If we are booting HP-UX machines, their secondary loader will 329 * ask for files like "/hp-ux". As a security measure, we do not 330 * allow boot files to lay outside the boot directory (unless they 331 * are purposely link'd out. So, make `filename' become the path- 332 * stripped file name and spoof the client into thinking that it 333 * really got what it wanted. 334 */ 335 filename = (filename = strrchr(filepath,'/'))? ++filename: filepath; 336 337 /* 338 * Check that this is a valid boot file name. 339 */ 340 for (i = 0; i < C_MAXFILE && filelist[i] != NULL; i++) 341 if (STREQN(filename, filelist[i])) 342 goto match; 343 344 /* 345 * Invalid boot file name, set error and send reply packet. 346 */ 347 rpl->r_brpl.rmp_retcode = RMP_E_NOFILE; 348 retval = 0; 349 goto sendpkt; 350 351 match: 352 /* 353 * This is a valid boot file. Open the file and save the file 354 * descriptor associated with this connection and set success 355 * indication. If the file couldnt be opened, set error: 356 * "no such file or dir" - RMP_E_NOFILE 357 * "file table overflow" - RMP_E_BUSY 358 * "too many open files" - RMP_E_BUSY 359 * anything else - RMP_E_OPENFILE 360 */ 361 if ((rconn->bootfd = open(filename, O_RDONLY, 0600)) < 0) { 362 rpl->r_brpl.rmp_retcode = (errno == ENOENT)? RMP_E_NOFILE: 363 (errno == EMFILE || errno == ENFILE)? RMP_E_BUSY: 364 RMP_E_OPENFILE; 365 retval = 0; 366 } else { 367 rpl->r_brpl.rmp_retcode = RMP_E_OKAY; 368 retval = 1; 369 } 370 371 sendpkt: 372 syslog(LOG_INFO, "%s: request to boot %s (%s)", 373 EnetStr(rconn), filename, retval? "granted": "denied"); 374 375 rconn->rmplen = RMPBOOTSIZE(rpl->r_brpl.rmp_flnmsize); 376 377 return (retval & SendPacket(rconn)); 378 } 379 380 /* 381 ** SendReadRepl -- send a portion of the boot file to the requester. 382 ** 383 ** Parameters: 384 ** rconn - the reply packet to be formatted. 385 ** 386 ** Returns: 387 ** 1 on success, 0 on failure. 388 ** 389 ** Side Effects: 390 ** none. 391 */ 392 int 393 SendReadRepl(RMPCONN *rconn) 394 { 395 int retval = 0; 396 RMPCONN *oldconn; 397 struct rmp_packet *rpl, *req; 398 int size = 0; 399 int madeconn = 0; 400 401 /* 402 * Find the old connection. If one doesn't exist, create one only 403 * to return the error code. 404 */ 405 if ((oldconn = FindConn(rconn)) == NULL) { 406 if ((oldconn = NewConn(rconn)) == NULL) 407 return(0); 408 syslog(LOG_ERR, "SendReadRepl: no active connection (%s)", 409 EnetStr(rconn)); 410 madeconn++; 411 } 412 413 req = &rconn->rmp; /* cache ptr to request packet */ 414 rpl = &oldconn->rmp; /* cache ptr to reply packet */ 415 416 if (madeconn) { /* no active connection above; abort */ 417 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT; 418 retval = 1; 419 goto sendpkt; 420 } 421 422 /* 423 * Make sure Session ID's match. 424 */ 425 if (ntohs(req->r_rrq.rmp_session) != 426 ((rpl->r_type == RMP_BOOT_REPL)? ntohs(rpl->r_brpl.rmp_session): 427 ntohs(rpl->r_rrpl.rmp_session))) { 428 syslog(LOG_ERR, "SendReadRepl: bad session id (%s)", 429 EnetStr(rconn)); 430 rpl->r_rrpl.rmp_retcode = RMP_E_BADSID; 431 retval = 1; 432 goto sendpkt; 433 } 434 435 /* 436 * If the requester asks for more data than we can fit, 437 * silently clamp the request size down to RMPREADDATA. 438 * 439 * N.B. I do not know if this is "legal", however it seems 440 * to work. This is necessary for bpfwrite() on machines 441 * with MCLBYTES less than 1514. 442 */ 443 if (ntohs(req->r_rrq.rmp_size) > RMPREADDATA) 444 req->r_rrq.rmp_size = htons(RMPREADDATA); 445 446 /* 447 * Position read head on file according to info in request packet. 448 */ 449 GETWORD(req->r_rrq.rmp_offset, size); 450 if (lseek(oldconn->bootfd, (off_t)size, SEEK_SET) < 0) { 451 syslog(LOG_ERR, "SendReadRepl: lseek: %m (%s)", 452 EnetStr(rconn)); 453 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT; 454 retval = 1; 455 goto sendpkt; 456 } 457 458 /* 459 * Read data directly into reply packet. 460 */ 461 if ((size = read(oldconn->bootfd, &rpl->r_rrpl.rmp_data, 462 (int) ntohs(req->r_rrq.rmp_size))) <= 0) { 463 if (size < 0) { 464 syslog(LOG_ERR, "SendReadRepl: read: %m (%s)", 465 EnetStr(rconn)); 466 rpl->r_rrpl.rmp_retcode = RMP_E_ABORT; 467 } else { 468 rpl->r_rrpl.rmp_retcode = RMP_E_EOF; 469 } 470 retval = 1; 471 goto sendpkt; 472 } 473 474 /* 475 * Set success indication. 476 */ 477 rpl->r_rrpl.rmp_retcode = RMP_E_OKAY; 478 479 sendpkt: 480 /* 481 * Set up assorted fields in reply packet. 482 */ 483 rpl->r_rrpl.rmp_type = RMP_READ_REPL; 484 COPYWORD(req->r_rrq.rmp_offset, rpl->r_rrpl.rmp_offset); 485 rpl->r_rrpl.rmp_session = req->r_rrq.rmp_session; 486 487 oldconn->rmplen = RMPREADSIZE(size); /* set size of packet */ 488 489 retval &= SendPacket(oldconn); /* send packet */ 490 491 if (madeconn) /* clean up after ourself */ 492 FreeConn(oldconn); 493 494 return (retval); 495 } 496 497 /* 498 ** BootDone -- free up memory allocated for a connection. 499 ** 500 ** Parameters: 501 ** rconn - incoming boot complete packet. 502 ** 503 ** Returns: 504 ** 1 on success, 0 on failure. 505 ** 506 ** Side Effects: 507 ** none. 508 */ 509 int 510 BootDone(RMPCONN *rconn) 511 { 512 RMPCONN *oldconn; 513 struct rmp_packet *rpl; 514 515 /* 516 * If we can't find the connection, ignore the request. 517 */ 518 if ((oldconn = FindConn(rconn)) == NULL) { 519 syslog(LOG_ERR, "BootDone: no existing connection (%s)", 520 EnetStr(rconn)); 521 return(0); 522 } 523 524 rpl = &oldconn->rmp; /* cache ptr to RMP packet */ 525 526 /* 527 * Make sure Session ID's match. 528 */ 529 if (ntohs(rconn->rmp.r_rrq.rmp_session) != 530 ((rpl->r_type == RMP_BOOT_REPL)? ntohs(rpl->r_brpl.rmp_session): 531 ntohs(rpl->r_rrpl.rmp_session))) { 532 syslog(LOG_ERR, "BootDone: bad session id (%s)", 533 EnetStr(rconn)); 534 return(0); 535 } 536 537 RemoveConn(oldconn); /* remove connection */ 538 539 syslog(LOG_INFO, "%s: boot complete", EnetStr(rconn)); 540 541 return(1); 542 } 543 544 /* 545 ** SendPacket -- send an RMP packet to a remote host. 546 ** 547 ** Parameters: 548 ** rconn - packet to be sent. 549 ** 550 ** Returns: 551 ** 1 on success, 0 on failure. 552 ** 553 ** Side Effects: 554 ** none. 555 */ 556 int 557 SendPacket(RMPCONN *rconn) 558 { 559 /* 560 * Set Ethernet Destination address to Source (BPF and the enet 561 * driver will take care of getting our source address set). 562 */ 563 memmove((char *)&rconn->rmp.hp_hdr.daddr[0], 564 (char *)&rconn->rmp.hp_hdr.saddr[0], RMP_ADDRLEN); 565 rconn->rmp.hp_hdr.len = htons(rconn->rmplen - sizeof(struct hp_hdr)); 566 567 /* 568 * Reverse 802.2/HP Extended Source & Destination Access Pts. 569 */ 570 rconn->rmp.hp_llc.dxsap = htons(HPEXT_SXSAP); 571 rconn->rmp.hp_llc.sxsap = htons(HPEXT_DXSAP); 572 573 /* 574 * Last time this connection was active. 575 */ 576 (void)gettimeofday(&rconn->tstamp, NULL); 577 578 if (DbgFp != NULL) /* display packet */ 579 DispPkt(rconn,DIR_SENT); 580 581 /* 582 * Send RMP packet to remote host. 583 */ 584 return(BpfWrite(rconn)); 585 } 586