1 /* $OpenBSD: print-atalk.c,v 1.33 2017/08/30 09:23:00 otto Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 * 23 * Format and print AppleTalk packets. 24 */ 25 26 #include <sys/time.h> 27 #include <sys/socket.h> 28 29 struct mbuf; 30 struct rtentry; 31 #include <net/if.h> 32 33 #include <netinet/in.h> 34 #include <netinet/ip.h> 35 #include <netinet/ip_var.h> 36 #include <netinet/if_ether.h> 37 #include <netinet/udp.h> 38 #include <netinet/udp_var.h> 39 #include <netinet/tcp.h> 40 41 #include <inttypes.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <limits.h> 46 47 #include "interface.h" 48 #include "addrtoname.h" 49 #include "ethertype.h" 50 #include "extract.h" /* must come after interface.h */ 51 #include "appletalk.h" 52 #include "savestr.h" 53 #include "privsep.h" 54 55 static struct tok type2str[] = { 56 { ddpRTMP, "rtmp" }, 57 { ddpRTMPrequest, "rtmpReq" }, 58 { ddpECHO, "echo" }, 59 { ddpIP, "IP" }, 60 { ddpARP, "ARP" }, 61 { ddpKLAP, "KLAP" }, 62 { 0, NULL } 63 }; 64 65 struct aarp { 66 u_int16_t htype, ptype; 67 u_int8_t halen, palen; 68 u_int16_t op; 69 u_int8_t hsaddr[6]; 70 u_int8_t psaddr[4]; 71 u_int8_t hdaddr[6]; 72 u_int8_t pdaddr[4]; 73 }; 74 75 static char tstr[] = "[|atalk]"; 76 77 static void atp_print(const struct atATP *, u_int); 78 static void atp_bitmap_print(u_char); 79 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char); 80 static const char *print_cstring(const char *, const u_char *); 81 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *, 82 const u_char *, 83 u_short, u_char, u_char); 84 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *, 85 const u_char *); 86 static const char *ataddr_string(u_short, u_char); 87 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char); 88 static const char *ddpskt_string(int); 89 90 /* 91 * Print AppleTalk Datagram Delivery Protocol packets 92 * without the LLAP encapsulating header (i.e. 93 * from Ethertalk) 94 */ 95 void 96 atalk_print(const u_char *bp, u_int length) 97 { 98 const struct atDDP *dp; 99 u_short snet; 100 101 if (length < ddpSize) { 102 (void)printf(" [|ddp %d]", length); 103 return; 104 } 105 dp = (const struct atDDP *)bp; 106 snet = EXTRACT_16BITS(&dp->srcNet); 107 printf("%s.%s", ataddr_string(snet, dp->srcNode), 108 ddpskt_string(dp->srcSkt)); 109 printf(" > %s.%s:", 110 ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode), 111 ddpskt_string(dp->dstSkt)); 112 bp += ddpSize; 113 length -= ddpSize; 114 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt); 115 } 116 117 /* 118 * Print AppleTalk Datagram Delivery Protocol packets 119 * from localtalk (i.e. the 230 Kbps net built into 120 * every Macintosh). We can get these from a localtalk 121 * interface if we have one, or from UDP encapsulated tunnels. 122 */ 123 void 124 atalk_print_llap(const u_char *bp, u_int length) 125 { 126 const struct LAP *lp; 127 const struct atDDP *dp; 128 const struct atShortDDP *sdp; 129 u_short snet; 130 131 if (length < sizeof(*lp)) { 132 (void)printf(" [|llap %d]", length); 133 return; 134 } 135 136 lp = (struct LAP *)bp; 137 bp += sizeof(*lp); 138 length -= sizeof(*lp); 139 switch (lp->type) { 140 141 case lapShortDDP: 142 if (length < ddpSSize) { 143 (void)printf(" [|sddp %d]", length); 144 return; 145 } 146 sdp = (const struct atShortDDP *)bp; 147 printf("%s.%s", 148 ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt)); 149 printf(" > %s.%s:", 150 ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt)); 151 bp += ddpSSize; 152 length -= ddpSSize; 153 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt); 154 break; 155 156 case lapDDP: 157 if (length < ddpSize) { 158 (void)printf(" [|ddp %d]", length); 159 return; 160 } 161 dp = (const struct atDDP *)bp; 162 snet = EXTRACT_16BITS(&dp->srcNet); 163 printf("%s.%s", ataddr_string(snet, dp->srcNode), 164 ddpskt_string(dp->srcSkt)); 165 printf(" > %s.%s:", 166 ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode), 167 ddpskt_string(dp->dstSkt)); 168 bp += ddpSize; 169 length -= ddpSize; 170 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt); 171 break; 172 173 #ifdef notdef 174 case lapKLAP: 175 klap_print(bp, length); 176 break; 177 #endif 178 179 default: 180 printf("%d > %d at-lap#%d %d", 181 lp->src, lp->dst, lp->type, length); 182 break; 183 } 184 } 185 186 /* XXX should probably pass in the snap header and do checks like arp_print() */ 187 void 188 aarp_print(const u_char *bp, u_int length) 189 { 190 const struct aarp *ap; 191 192 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3]) 193 194 printf("aarp "); 195 ap = (const struct aarp *)bp; 196 if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK && 197 ap->halen == 6 && ap->palen == 4 ) 198 switch (ntohs(ap->op)) { 199 200 case 1: /* request */ 201 (void)printf("who-has %s tell %s", 202 AT(pdaddr), AT(psaddr)); 203 return; 204 205 case 2: /* response */ 206 (void)printf("reply %s is-at %s", 207 AT(pdaddr), etheraddr_string(ap->hdaddr)); 208 return; 209 210 case 3: /* probe (oy!) */ 211 (void)printf("probe %s tell %s", 212 AT(pdaddr), AT(psaddr)); 213 return; 214 } 215 (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u", 216 length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype), 217 ap->halen, ap->palen); 218 } 219 220 static void 221 ddp_print(const u_char *bp, u_int length, int t, 222 u_short snet, u_char snode, u_char skt) 223 { 224 225 if ((intptr_t)bp & (sizeof(long)-1)) { 226 static u_char *abuf = NULL; 227 int clen = snapend - bp; 228 if (clen > snaplen) 229 clen = snaplen; 230 231 if (abuf == NULL) { 232 abuf = malloc(snaplen); 233 if (abuf == NULL) 234 error("ddp_print: malloc"); 235 } 236 memmove((char *)abuf, (char *)bp, min(length, clen)); 237 snapend = abuf + clen; 238 packetp = abuf; 239 bp = abuf; 240 } 241 242 switch (t) { 243 244 case ddpNBP: 245 nbp_print((const struct atNBP *)bp, length, snet, snode, skt); 246 break; 247 248 case ddpATP: 249 atp_print((const struct atATP *)bp, length); 250 break; 251 252 default: 253 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length); 254 break; 255 } 256 } 257 258 static void 259 atp_print(const struct atATP *ap, u_int length) 260 { 261 char c; 262 u_int32_t data; 263 264 if ((const u_char *)(ap + 1) > snapend) { 265 /* Just bail if we don't have the whole chunk. */ 266 fputs(tstr, stdout); 267 return; 268 } 269 length -= sizeof(*ap); 270 switch (ap->control & 0xc0) { 271 272 case atpReqCode: 273 (void)printf(" atp-req%s %d", 274 ap->control & atpXO? " " : "*", 275 EXTRACT_16BITS(&ap->transID)); 276 277 atp_bitmap_print(ap->bitmap); 278 279 if (length != 0) 280 (void)printf(" [len=%d]", length); 281 282 switch (ap->control & (atpEOM|atpSTS)) { 283 case atpEOM: 284 (void)printf(" [EOM]"); 285 break; 286 case atpSTS: 287 (void)printf(" [STS]"); 288 break; 289 case atpEOM|atpSTS: 290 (void)printf(" [EOM,STS]"); 291 break; 292 } 293 break; 294 295 case atpRspCode: 296 (void)printf(" atp-resp%s%d:%d (%d)", 297 ap->control & atpEOM? "*" : " ", 298 EXTRACT_16BITS(&ap->transID), ap->bitmap, length); 299 switch (ap->control & (atpXO|atpSTS)) { 300 case atpXO: 301 (void)printf(" [XO]"); 302 break; 303 case atpSTS: 304 (void)printf(" [STS]"); 305 break; 306 case atpXO|atpSTS: 307 (void)printf(" [XO,STS]"); 308 break; 309 } 310 break; 311 312 case atpRelCode: 313 (void)printf(" atp-rel %d", EXTRACT_16BITS(&ap->transID)); 314 315 atp_bitmap_print(ap->bitmap); 316 317 /* length should be zero */ 318 if (length) 319 (void)printf(" [len=%d]", length); 320 321 /* there shouldn't be any control flags */ 322 if (ap->control & (atpXO|atpEOM|atpSTS)) { 323 c = '['; 324 if (ap->control & atpXO) { 325 (void)printf("%cXO", c); 326 c = ','; 327 } 328 if (ap->control & atpEOM) { 329 (void)printf("%cEOM", c); 330 c = ','; 331 } 332 if (ap->control & atpSTS) { 333 (void)printf("%cSTS", c); 334 c = ','; 335 } 336 (void)printf("]"); 337 } 338 break; 339 340 default: 341 (void)printf(" atp-0x%x %d (%d)", ap->control, 342 EXTRACT_16BITS(&ap->transID), length); 343 break; 344 } 345 data = EXTRACT_32BITS(&ap->userData); 346 if (data != 0) 347 (void)printf(" 0x%x", data); 348 } 349 350 static void 351 atp_bitmap_print(u_char bm) 352 { 353 char c; 354 int i; 355 356 /* 357 * The '& 0xff' below is needed for compilers that want to sign 358 * extend a u_char, which is the case with the Ultrix compiler. 359 * (gcc is smart enough to eliminate it, at least on the Sparc). 360 */ 361 if ((bm + 1) & (bm & 0xff)) { 362 c = '<'; 363 for (i = 0; bm; ++i) { 364 if (bm & 1) { 365 (void)printf("%c%d", c, i); 366 c = ','; 367 } 368 bm >>= 1; 369 } 370 (void)printf(">"); 371 } else { 372 for (i = 0; bm; ++i) 373 bm >>= 1; 374 if (i > 1) 375 (void)printf("<0-%d>", i - 1); 376 else 377 (void)printf("<0>"); 378 } 379 } 380 381 static void 382 nbp_print(const struct atNBP *np, u_int length, u_short snet, 383 u_char snode, u_char skt) 384 { 385 const struct atNBPtuple *tp = 386 (struct atNBPtuple *)((u_char *)np + nbpHeaderSize); 387 int i; 388 const u_char *ep; 389 390 if (length < nbpHeaderSize) { 391 (void)printf(" truncated-nbp %d", length); 392 return; 393 } 394 395 length -= nbpHeaderSize; 396 if (length < 8) { 397 /* must be room for at least one tuple */ 398 if (np->control == nbpNATLKerr) { 399 (void)printf(" nbp-netatalk_err"); 400 return; 401 } else if (np->control == nbpNATLKok) { 402 (void)printf(" nbp-netatalk_ok"); 403 return; 404 } 405 (void)printf(" truncated-nbp nbp-0x%x %d (%d)", 406 np->control, np->id, length + nbpHeaderSize); 407 return; 408 } 409 /* ep points to end of available data */ 410 ep = snapend; 411 if ((const u_char *)tp > ep) { 412 fputs(tstr, stdout); 413 return; 414 } 415 switch (i = np->control & 0xf0) { 416 417 case nbpBrRq: 418 case nbpLkUp: 419 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:", 420 np->id); 421 if ((const u_char *)(tp + 1) > ep) { 422 fputs(tstr, stdout); 423 return; 424 } 425 (void)nbp_name_print(tp, ep); 426 /* 427 * look for anomalies: the spec says there can only 428 * be one tuple, the address must match the source 429 * address and the enumerator should be zero. 430 */ 431 if ((np->control & 0xf) != 1) 432 (void)printf(" [ntup=%d]", np->control & 0xf); 433 if (tp->enumerator) 434 (void)printf(" [enum=%d]", tp->enumerator); 435 if (EXTRACT_16BITS(&tp->net) != snet || 436 tp->node != snode || tp->skt != skt) 437 (void)printf(" [addr=%s.%d]", 438 ataddr_string(EXTRACT_16BITS(&tp->net), 439 tp->node), tp->skt); 440 break; 441 442 case nbpLkUpReply: 443 (void)printf(" nbp-reply %d:", np->id); 444 445 /* print each of the tuples in the reply */ 446 for (i = np->control & 0xf; --i >= 0 && tp; ) 447 tp = nbp_tuple_print(tp, ep, snet, snode, skt); 448 break; 449 450 case nbpNATLKrgstr: 451 case nbpNATLKunrgstr: 452 (void)printf((i == nbpNATLKrgstr) ? 453 " nbp-netatalk_rgstr %d:" : 454 " nbp-netatalk_unrgstr %d:", 455 np->id); 456 for (i = np->control & 0xf; --i >= 0 && tp; ) 457 tp = nbp_tuple_print(tp, ep, snet, snode, skt); 458 break; 459 460 default: 461 (void)printf(" nbp-0x%x %d (%d)", np->control, np->id, 462 length); 463 break; 464 } 465 } 466 467 /* print a counted string */ 468 static const char * 469 print_cstring(const char *cp, const u_char *ep) 470 { 471 u_int length; 472 473 if (cp >= (const char *)ep) { 474 fputs(tstr, stdout); 475 return (0); 476 } 477 length = *cp++; 478 479 /* Spec says string can be at most 32 bytes long */ 480 if (length > 32) { 481 (void)printf("[len=%d]", length); 482 return (0); 483 } 484 while ((int)--length >= 0) { 485 if (cp >= (char *)ep) { 486 fputs(tstr, stdout); 487 return (0); 488 } 489 putchar(*cp++); 490 } 491 return (cp); 492 } 493 494 static const struct atNBPtuple * 495 nbp_tuple_print(const struct atNBPtuple *tp, 496 const u_char *ep, 497 u_short snet, u_char snode, 498 u_char skt) 499 { 500 const struct atNBPtuple *tpn; 501 502 if ((const u_char *)(tp + 1) > ep) { 503 fputs(tstr, stdout); 504 return 0; 505 } 506 tpn = nbp_name_print(tp, ep); 507 508 /* if the enumerator isn't 1, print it */ 509 if (tp->enumerator != 1) 510 (void)printf("(%d)", tp->enumerator); 511 512 /* if the socket doesn't match the src socket, print it */ 513 if (tp->skt != skt) 514 (void)printf(" %d", tp->skt); 515 516 /* if the address doesn't match the src address, it's an anomaly */ 517 if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode) 518 (void)printf(" [addr=%s]", 519 ataddr_string(EXTRACT_16BITS(&tp->net), tp->node)); 520 521 return (tpn); 522 } 523 524 static const struct atNBPtuple * 525 nbp_name_print(const struct atNBPtuple *tp, const u_char *ep) 526 { 527 const char *cp = (const char *)tp + nbpTupleSize; 528 529 putchar(' '); 530 531 /* Object */ 532 putchar('"'); 533 if ((cp = print_cstring(cp, ep)) != NULL) { 534 /* Type */ 535 putchar(':'); 536 if ((cp = print_cstring(cp, ep)) != NULL) { 537 /* Zone */ 538 putchar('@'); 539 if ((cp = print_cstring(cp, ep)) != NULL) 540 putchar('"'); 541 } 542 } 543 return ((const struct atNBPtuple *)cp); 544 } 545 546 547 #define HASHNAMESIZE 4096 548 549 struct hnamemem { 550 int addr; 551 char *name; 552 struct hnamemem *nxt; 553 }; 554 555 static struct hnamemem hnametable[HASHNAMESIZE]; 556 557 static const char * 558 ataddr_string(u_short atnet, u_char athost) 559 { 560 struct hnamemem *tp, *tp2; 561 int i = (atnet << 8) | athost; 562 char nambuf[HOST_NAME_MAX+1 + 20]; 563 564 for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt) 565 if (tp->addr == i) 566 return (tp->name); 567 568 /* didn't have the node name -- see if we've got the net name */ 569 i |= 255; 570 for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt) 571 if (tp2->addr == i) { 572 tp->addr = (atnet << 8) | athost; 573 tp->nxt = newhnamemem(); 574 (void)snprintf(nambuf, sizeof nambuf, "%s.%d", 575 tp2->name, athost); 576 tp->name = savestr(nambuf); 577 return (tp->name); 578 } 579 580 tp->addr = (atnet << 8) | athost; 581 tp->nxt = newhnamemem(); 582 if (athost != 255) 583 (void)snprintf(nambuf, sizeof nambuf, "%d.%d.%d", 584 atnet >> 8, atnet & 0xff, athost); 585 else 586 (void)snprintf(nambuf, sizeof nambuf, "%d.%d", 587 atnet >> 8, atnet & 0xff); 588 tp->name = savestr(nambuf); 589 590 return (tp->name); 591 } 592 593 static struct tok skt2str[] = { 594 { rtmpSkt, "rtmp" }, /* routing table maintenance */ 595 { nbpSkt, "nis" }, /* name info socket */ 596 { echoSkt, "echo" }, /* AppleTalk echo protocol */ 597 { zipSkt, "zip" }, /* zone info protocol */ 598 { 0, NULL } 599 }; 600 601 static const char * 602 ddpskt_string(int skt) 603 { 604 static char buf[12]; 605 606 if (nflag) { 607 (void)snprintf(buf, sizeof buf, "%d", skt); 608 return (buf); 609 } 610 return (tok2str(skt2str, "%d", skt)); 611 } 612