addrtoname.c revision 1.8
1/* 2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * Internet, ethernet, port, and protocol string to address 22 * and address to string conversion routines 23 */ 24#include <sys/cdefs.h> 25#ifndef lint 26__RCSID("$NetBSD: addrtoname.c,v 1.8 2017/01/24 23:29:13 christos Exp $"); 27#endif 28 29#ifdef HAVE_CONFIG_H 30#include "config.h" 31#endif 32 33#include <netdissect-stdinc.h> 34 35#ifdef USE_ETHER_NTOHOST 36#ifdef HAVE_NETINET_IF_ETHER_H 37struct mbuf; /* Squelch compiler warnings on some platforms for */ 38struct rtentry; /* declarations in <net/if.h> */ 39#include <net/if.h> /* for "struct ifnet" in "struct arpcom" on Solaris */ 40#include <netinet/if_ether.h> 41#endif /* HAVE_NETINET_IF_ETHER_H */ 42#ifdef NETINET_ETHER_H_DECLARES_ETHER_NTOHOST 43#include <netinet/ether.h> 44#endif /* NETINET_ETHER_H_DECLARES_ETHER_NTOHOST */ 45 46#if !defined(HAVE_DECL_ETHER_NTOHOST) || !HAVE_DECL_ETHER_NTOHOST 47#ifndef HAVE_STRUCT_ETHER_ADDR 48struct ether_addr { 49 unsigned char ether_addr_octet[6]; 50}; 51#endif 52extern int ether_ntohost(char *, const struct ether_addr *); 53#endif 54 55#endif /* USE_ETHER_NTOHOST */ 56 57#include <pcap.h> 58#include <pcap-namedb.h> 59#include <signal.h> 60#include <stdio.h> 61#include <string.h> 62#include <stdlib.h> 63 64#include "netdissect.h" 65#include "addrtoname.h" 66#include "addrtostr.h" 67#include "ethertype.h" 68#include "llc.h" 69#include "setsignal.h" 70#include "extract.h" 71#include "oui.h" 72 73#ifndef ETHER_ADDR_LEN 74#define ETHER_ADDR_LEN 6 75#endif 76 77/* 78 * hash tables for whatever-to-name translations 79 * 80 * ndo_error() called on strdup(3) failure 81 */ 82 83#define HASHNAMESIZE 4096 84 85struct hnamemem { 86 uint32_t addr; 87 const char *name; 88 struct hnamemem *nxt; 89}; 90 91static struct hnamemem hnametable[HASHNAMESIZE]; 92static struct hnamemem tporttable[HASHNAMESIZE]; 93static struct hnamemem uporttable[HASHNAMESIZE]; 94static struct hnamemem eprototable[HASHNAMESIZE]; 95static struct hnamemem dnaddrtable[HASHNAMESIZE]; 96static struct hnamemem ipxsaptable[HASHNAMESIZE]; 97 98#ifdef _WIN32 99/* 100 * fake gethostbyaddr for Win2k/XP 101 * gethostbyaddr() returns incorrect value when AF_INET6 is passed 102 * to 3rd argument. 103 * 104 * h_name in struct hostent is only valid. 105 */ 106static struct hostent * 107win32_gethostbyaddr(const char *addr, int len, int type) 108{ 109 static struct hostent host; 110 static char hostbuf[NI_MAXHOST]; 111 char hname[NI_MAXHOST]; 112 struct sockaddr_in6 addr6; 113 114 host.h_name = hostbuf; 115 switch (type) { 116 case AF_INET: 117 return gethostbyaddr(addr, len, type); 118 break; 119 case AF_INET6: 120 memset(&addr6, 0, sizeof(addr6)); 121 addr6.sin6_family = AF_INET6; 122 memcpy(&addr6.sin6_addr, addr, len); 123 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6), 124 hname, sizeof(hname), NULL, 0, 0)) { 125 return NULL; 126 } else { 127 strcpy(host.h_name, hname); 128 return &host; 129 } 130 break; 131 default: 132 return NULL; 133 } 134} 135#define gethostbyaddr win32_gethostbyaddr 136#endif /* _WIN32 */ 137 138struct h6namemem { 139 struct in6_addr addr; 140 char *name; 141 struct h6namemem *nxt; 142}; 143 144static struct h6namemem h6nametable[HASHNAMESIZE]; 145 146struct enamemem { 147 u_short e_addr0; 148 u_short e_addr1; 149 u_short e_addr2; 150 const char *e_name; 151 u_char *e_nsap; /* used only for nsaptable[] */ 152#define e_bs e_nsap /* for bytestringtable */ 153 struct enamemem *e_nxt; 154}; 155 156static struct enamemem enametable[HASHNAMESIZE]; 157static struct enamemem nsaptable[HASHNAMESIZE]; 158static struct enamemem bytestringtable[HASHNAMESIZE]; 159 160struct protoidmem { 161 uint32_t p_oui; 162 u_short p_proto; 163 const char *p_name; 164 struct protoidmem *p_nxt; 165}; 166 167static struct protoidmem protoidtable[HASHNAMESIZE]; 168 169/* 170 * A faster replacement for inet_ntoa(). 171 */ 172const char * 173intoa(uint32_t addr) 174{ 175 register char *cp; 176 register u_int byte; 177 register int n; 178 static char buf[sizeof(".xxx.xxx.xxx.xxx")]; 179 180 NTOHL(addr); 181 cp = buf + sizeof(buf); 182 *--cp = '\0'; 183 184 n = 4; 185 do { 186 byte = addr & 0xff; 187 *--cp = byte % 10 + '0'; 188 byte /= 10; 189 if (byte > 0) { 190 *--cp = byte % 10 + '0'; 191 byte /= 10; 192 if (byte > 0) 193 *--cp = byte + '0'; 194 } 195 *--cp = '.'; 196 addr >>= 8; 197 } while (--n > 0); 198 199 return cp + 1; 200} 201 202static uint32_t f_netmask; 203static uint32_t f_localnet; 204 205/* 206 * Return a name for the IP address pointed to by ap. This address 207 * is assumed to be in network byte order. 208 * 209 * NOTE: ap is *NOT* necessarily part of the packet data (not even if 210 * this is being called with the "ipaddr_string()" macro), so you 211 * *CANNOT* use the ND_TCHECK{2}/ND_TTEST{2} macros on it. Furthermore, 212 * even in cases where it *is* part of the packet data, the caller 213 * would still have to check for a null return value, even if it's 214 * just printing the return value with "%s" - not all versions of 215 * printf print "(null)" with "%s" and a null pointer, some of them 216 * don't check for a null pointer and crash in that case. 217 * 218 * The callers of this routine should, before handing this routine 219 * a pointer to packet data, be sure that the data is present in 220 * the packet buffer. They should probably do those checks anyway, 221 * as other data at that layer might not be IP addresses, and it 222 * also needs to check whether they're present in the packet buffer. 223 */ 224const char * 225getname(netdissect_options *ndo, const u_char *ap) 226{ 227 register struct hostent *hp; 228 uint32_t addr; 229 struct hnamemem *p; 230 231 memcpy(&addr, ap, sizeof(addr)); 232 p = &hnametable[addr & (HASHNAMESIZE-1)]; 233 for (; p->nxt; p = p->nxt) { 234 if (p->addr == addr) 235 return (p->name); 236 } 237 p->addr = addr; 238 p->nxt = newhnamemem(ndo); 239 240 /* 241 * Print names unless: 242 * (1) -n was given. 243 * (2) Address is foreign and -f was given. (If -f was not 244 * given, f_netmask and f_localnet are 0 and the test 245 * evaluates to true) 246 */ 247 if (!ndo->ndo_nflag && 248 (addr & f_netmask) == f_localnet) { 249 hp = gethostbyaddr((char *)&addr, 4, AF_INET); 250 if (hp) { 251 char *dotp; 252 253 p->name = strdup(hp->h_name); 254 if (p->name == NULL) 255 (*ndo->ndo_error)(ndo, 256 "getname: strdup(hp->h_name)"); 257 if (ndo->ndo_Nflag) { 258 /* Remove domain qualifications */ 259 dotp = strchr(p->name, '.'); 260 if (dotp) 261 *dotp = '\0'; 262 } 263 return (p->name); 264 } 265 } 266 p->name = strdup(intoa(addr)); 267 if (p->name == NULL) 268 (*ndo->ndo_error)(ndo, "getname: strdup(intoa(addr))"); 269 return (p->name); 270} 271 272/* 273 * Return a name for the IP6 address pointed to by ap. This address 274 * is assumed to be in network byte order. 275 */ 276const char * 277getname6(netdissect_options *ndo, const u_char *ap) 278{ 279 register struct hostent *hp; 280 union { 281 struct in6_addr addr; 282 struct for_hash_addr { 283 char fill[14]; 284 uint16_t d; 285 } addra; 286 } addr; 287 struct h6namemem *p; 288 register const char *cp; 289 char ntop_buf[INET6_ADDRSTRLEN]; 290 291 memcpy(&addr, ap, sizeof(addr)); 292 p = &h6nametable[addr.addra.d & (HASHNAMESIZE-1)]; 293 for (; p->nxt; p = p->nxt) { 294 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0) 295 return (p->name); 296 } 297 p->addr = addr.addr; 298 p->nxt = newh6namemem(ndo); 299 300 /* 301 * Do not print names if -n was given. 302 */ 303 if (!ndo->ndo_nflag) { 304 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6); 305 if (hp) { 306 char *dotp; 307 308 p->name = strdup(hp->h_name); 309 if (p->name == NULL) 310 (*ndo->ndo_error)(ndo, 311 "getname6: strdup(hp->h_name)"); 312 if (ndo->ndo_Nflag) { 313 /* Remove domain qualifications */ 314 dotp = strchr(p->name, '.'); 315 if (dotp) 316 *dotp = '\0'; 317 } 318 return (p->name); 319 } 320 } 321 cp = addrtostr6(ap, ntop_buf, sizeof(ntop_buf)); 322 p->name = strdup(cp); 323 if (p->name == NULL) 324 (*ndo->ndo_error)(ndo, "getname6: strdup(cp)"); 325 return (p->name); 326} 327 328static const char hex[] = "0123456789abcdef"; 329 330 331/* Find the hash node that corresponds the ether address 'ep' */ 332 333static inline struct enamemem * 334lookup_emem(netdissect_options *ndo, const u_char *ep) 335{ 336 register u_int i, j, k; 337 struct enamemem *tp; 338 339 k = (ep[0] << 8) | ep[1]; 340 j = (ep[2] << 8) | ep[3]; 341 i = (ep[4] << 8) | ep[5]; 342 343 tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)]; 344 while (tp->e_nxt) 345 if (tp->e_addr0 == i && 346 tp->e_addr1 == j && 347 tp->e_addr2 == k) 348 return tp; 349 else 350 tp = tp->e_nxt; 351 tp->e_addr0 = i; 352 tp->e_addr1 = j; 353 tp->e_addr2 = k; 354 tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp)); 355 if (tp->e_nxt == NULL) 356 (*ndo->ndo_error)(ndo, "lookup_emem: calloc"); 357 358 return tp; 359} 360 361/* 362 * Find the hash node that corresponds to the bytestring 'bs' 363 * with length 'nlen' 364 */ 365 366static inline struct enamemem * 367lookup_bytestring(netdissect_options *ndo, register const u_char *bs, 368 const unsigned int nlen) 369{ 370 struct enamemem *tp; 371 register u_int i, j, k; 372 373 if (nlen >= 6) { 374 k = (bs[0] << 8) | bs[1]; 375 j = (bs[2] << 8) | bs[3]; 376 i = (bs[4] << 8) | bs[5]; 377 } else if (nlen >= 4) { 378 k = (bs[0] << 8) | bs[1]; 379 j = (bs[2] << 8) | bs[3]; 380 i = 0; 381 } else 382 i = j = k = 0; 383 384 tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)]; 385 while (tp->e_nxt) 386 if (tp->e_addr0 == i && 387 tp->e_addr1 == j && 388 tp->e_addr2 == k && 389 memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0) 390 return tp; 391 else 392 tp = tp->e_nxt; 393 394 tp->e_addr0 = i; 395 tp->e_addr1 = j; 396 tp->e_addr2 = k; 397 398 tp->e_bs = (u_char *) calloc(1, nlen + 1); 399 if (tp->e_bs == NULL) 400 (*ndo->ndo_error)(ndo, "lookup_bytestring: calloc"); 401 402 memcpy(tp->e_bs, bs, nlen); 403 tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp)); 404 if (tp->e_nxt == NULL) 405 (*ndo->ndo_error)(ndo, "lookup_bytestring: calloc"); 406 407 return tp; 408} 409 410/* Find the hash node that corresponds the NSAP 'nsap' */ 411 412static inline struct enamemem * 413lookup_nsap(netdissect_options *ndo, register const u_char *nsap) 414{ 415 register u_int i, j, k; 416 unsigned int nlen = *nsap; 417 struct enamemem *tp; 418 const u_char *ensap = nsap + nlen - 6; 419 420 if (nlen > 6) { 421 k = (ensap[0] << 8) | ensap[1]; 422 j = (ensap[2] << 8) | ensap[3]; 423 i = (ensap[4] << 8) | ensap[5]; 424 } 425 else 426 i = j = k = 0; 427 428 tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)]; 429 while (tp->e_nxt) 430 if (tp->e_addr0 == i && 431 tp->e_addr1 == j && 432 tp->e_addr2 == k && 433 tp->e_nsap[0] == nlen && 434 memcmp((const char *)&(nsap[1]), 435 (char *)&(tp->e_nsap[1]), nlen) == 0) 436 return tp; 437 else 438 tp = tp->e_nxt; 439 tp->e_addr0 = i; 440 tp->e_addr1 = j; 441 tp->e_addr2 = k; 442 tp->e_nsap = (u_char *)malloc(nlen + 1); 443 if (tp->e_nsap == NULL) 444 (*ndo->ndo_error)(ndo, "lookup_nsap: malloc"); 445 memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1); 446 tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp)); 447 if (tp->e_nxt == NULL) 448 (*ndo->ndo_error)(ndo, "lookup_nsap: calloc"); 449 450 return tp; 451} 452 453/* Find the hash node that corresponds the protoid 'pi'. */ 454 455static inline struct protoidmem * 456lookup_protoid(netdissect_options *ndo, const u_char *pi) 457{ 458 register u_int i, j; 459 struct protoidmem *tp; 460 461 /* 5 octets won't be aligned */ 462 i = (((pi[0] << 8) + pi[1]) << 8) + pi[2]; 463 j = (pi[3] << 8) + pi[4]; 464 /* XXX should be endian-insensitive, but do big-endian testing XXX */ 465 466 tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)]; 467 while (tp->p_nxt) 468 if (tp->p_oui == i && tp->p_proto == j) 469 return tp; 470 else 471 tp = tp->p_nxt; 472 tp->p_oui = i; 473 tp->p_proto = j; 474 tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp)); 475 if (tp->p_nxt == NULL) 476 (*ndo->ndo_error)(ndo, "lookup_protoid: calloc"); 477 478 return tp; 479} 480 481const char * 482etheraddr_string(netdissect_options *ndo, register const u_char *ep) 483{ 484 register int i; 485 register char *cp; 486 register struct enamemem *tp; 487 int oui; 488 char buf[BUFSIZE]; 489 490 tp = lookup_emem(ndo, ep); 491 if (tp->e_name) 492 return (tp->e_name); 493#ifdef USE_ETHER_NTOHOST 494 if (!ndo->ndo_nflag) { 495 char buf2[BUFSIZE]; 496 497 if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) { 498 tp->e_name = strdup(buf2); 499 if (tp->e_name == NULL) 500 (*ndo->ndo_error)(ndo, 501 "etheraddr_string: strdup(buf2)"); 502 return (tp->e_name); 503 } 504 } 505#endif 506 cp = buf; 507 oui = EXTRACT_24BITS(ep); 508 *cp++ = hex[*ep >> 4 ]; 509 *cp++ = hex[*ep++ & 0xf]; 510 for (i = 5; --i >= 0;) { 511 *cp++ = ':'; 512 *cp++ = hex[*ep >> 4 ]; 513 *cp++ = hex[*ep++ & 0xf]; 514 } 515 516 if (!ndo->ndo_nflag) { 517 snprintf(cp, BUFSIZE - (2 + 5*3), " (oui %s)", 518 tok2str(oui_values, "Unknown", oui)); 519 } else 520 *cp = '\0'; 521 tp->e_name = strdup(buf); 522 if (tp->e_name == NULL) 523 (*ndo->ndo_error)(ndo, "etheraddr_string: strdup(buf)"); 524 return (tp->e_name); 525} 526 527const char * 528le64addr_string(netdissect_options *ndo, const u_char *ep) 529{ 530 const unsigned int len = 8; 531 register u_int i; 532 register char *cp; 533 register struct enamemem *tp; 534 char buf[BUFSIZE]; 535 536 tp = lookup_bytestring(ndo, ep, len); 537 if (tp->e_name) 538 return (tp->e_name); 539 540 cp = buf; 541 for (i = len; i > 0 ; --i) { 542 *cp++ = hex[*(ep + i - 1) >> 4]; 543 *cp++ = hex[*(ep + i - 1) & 0xf]; 544 *cp++ = ':'; 545 } 546 cp --; 547 548 *cp = '\0'; 549 550 tp->e_name = strdup(buf); 551 if (tp->e_name == NULL) 552 (*ndo->ndo_error)(ndo, "le64addr_string: strdup(buf)"); 553 554 return (tp->e_name); 555} 556 557const char * 558linkaddr_string(netdissect_options *ndo, const u_char *ep, 559 const unsigned int type, const unsigned int len) 560{ 561 register u_int i; 562 register char *cp; 563 register struct enamemem *tp; 564 565 if (len == 0) 566 return ("<empty>"); 567 568 if (type == LINKADDR_ETHER && len == ETHER_ADDR_LEN) 569 return (etheraddr_string(ndo, ep)); 570 571 if (type == LINKADDR_FRELAY) 572 return (q922_string(ndo, ep, len)); 573 574 tp = lookup_bytestring(ndo, ep, len); 575 if (tp->e_name) 576 return (tp->e_name); 577 578 tp->e_name = cp = (char *)malloc(len*3); 579 if (tp->e_name == NULL) 580 (*ndo->ndo_error)(ndo, "linkaddr_string: malloc"); 581 *cp++ = hex[*ep >> 4]; 582 *cp++ = hex[*ep++ & 0xf]; 583 for (i = len-1; i > 0 ; --i) { 584 *cp++ = ':'; 585 *cp++ = hex[*ep >> 4]; 586 *cp++ = hex[*ep++ & 0xf]; 587 } 588 *cp = '\0'; 589 return (tp->e_name); 590} 591 592const char * 593etherproto_string(netdissect_options *ndo, u_short port) 594{ 595 register char *cp; 596 register struct hnamemem *tp; 597 register uint32_t i = port; 598 char buf[sizeof("0000")]; 599 600 for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt) 601 if (tp->addr == i) 602 return (tp->name); 603 604 tp->addr = i; 605 tp->nxt = newhnamemem(ndo); 606 607 cp = buf; 608 NTOHS(port); 609 *cp++ = hex[port >> 12 & 0xf]; 610 *cp++ = hex[port >> 8 & 0xf]; 611 *cp++ = hex[port >> 4 & 0xf]; 612 *cp++ = hex[port & 0xf]; 613 *cp++ = '\0'; 614 tp->name = strdup(buf); 615 if (tp->name == NULL) 616 (*ndo->ndo_error)(ndo, "etherproto_string: strdup(buf)"); 617 return (tp->name); 618} 619 620const char * 621protoid_string(netdissect_options *ndo, register const u_char *pi) 622{ 623 register u_int i, j; 624 register char *cp; 625 register struct protoidmem *tp; 626 char buf[sizeof("00:00:00:00:00")]; 627 628 tp = lookup_protoid(ndo, pi); 629 if (tp->p_name) 630 return tp->p_name; 631 632 cp = buf; 633 if ((j = *pi >> 4) != 0) 634 *cp++ = hex[j]; 635 *cp++ = hex[*pi++ & 0xf]; 636 for (i = 4; (int)--i >= 0;) { 637 *cp++ = ':'; 638 if ((j = *pi >> 4) != 0) 639 *cp++ = hex[j]; 640 *cp++ = hex[*pi++ & 0xf]; 641 } 642 *cp = '\0'; 643 tp->p_name = strdup(buf); 644 if (tp->p_name == NULL) 645 (*ndo->ndo_error)(ndo, "protoid_string: strdup(buf)"); 646 return (tp->p_name); 647} 648 649#define ISONSAP_MAX_LENGTH 20 650const char * 651isonsap_string(netdissect_options *ndo, const u_char *nsap, 652 register u_int nsap_length) 653{ 654 register u_int nsap_idx; 655 register char *cp; 656 register struct enamemem *tp; 657 658 if (nsap_length < 1 || nsap_length > ISONSAP_MAX_LENGTH) 659 return ("isonsap_string: illegal length"); 660 661 tp = lookup_nsap(ndo, nsap); 662 if (tp->e_name) 663 return tp->e_name; 664 665 tp->e_name = cp = (char *)malloc(sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx")); 666 if (cp == NULL) 667 (*ndo->ndo_error)(ndo, "isonsap_string: malloc"); 668 669 for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) { 670 *cp++ = hex[*nsap >> 4]; 671 *cp++ = hex[*nsap++ & 0xf]; 672 if (((nsap_idx & 1) == 0) && 673 (nsap_idx + 1 < nsap_length)) { 674 *cp++ = '.'; 675 } 676 } 677 *cp = '\0'; 678 return (tp->e_name); 679} 680 681const char * 682tcpport_string(netdissect_options *ndo, u_short port) 683{ 684 register struct hnamemem *tp; 685 register uint32_t i = port; 686 char buf[sizeof("00000")]; 687 688 for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt) 689 if (tp->addr == i) 690 return (tp->name); 691 692 tp->addr = i; 693 tp->nxt = newhnamemem(ndo); 694 695 (void)snprintf(buf, sizeof(buf), "%u", i); 696 tp->name = strdup(buf); 697 if (tp->name == NULL) 698 (*ndo->ndo_error)(ndo, "tcpport_string: strdup(buf)"); 699 return (tp->name); 700} 701 702const char * 703udpport_string(netdissect_options *ndo, register u_short port) 704{ 705 register struct hnamemem *tp; 706 register uint32_t i = port; 707 char buf[sizeof("00000")]; 708 709 for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt) 710 if (tp->addr == i) 711 return (tp->name); 712 713 tp->addr = i; 714 tp->nxt = newhnamemem(ndo); 715 716 (void)snprintf(buf, sizeof(buf), "%u", i); 717 tp->name = strdup(buf); 718 if (tp->name == NULL) 719 (*ndo->ndo_error)(ndo, "udpport_string: strdup(buf)"); 720 return (tp->name); 721} 722 723const char * 724ipxsap_string(netdissect_options *ndo, u_short port) 725{ 726 register char *cp; 727 register struct hnamemem *tp; 728 register uint32_t i = port; 729 char buf[sizeof("0000")]; 730 731 for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt) 732 if (tp->addr == i) 733 return (tp->name); 734 735 tp->addr = i; 736 tp->nxt = newhnamemem(ndo); 737 738 cp = buf; 739 NTOHS(port); 740 *cp++ = hex[port >> 12 & 0xf]; 741 *cp++ = hex[port >> 8 & 0xf]; 742 *cp++ = hex[port >> 4 & 0xf]; 743 *cp++ = hex[port & 0xf]; 744 *cp++ = '\0'; 745 tp->name = strdup(buf); 746 if (tp->name == NULL) 747 (*ndo->ndo_error)(ndo, "ipxsap_string: strdup(buf)"); 748 return (tp->name); 749} 750 751static void 752init_servarray(netdissect_options *ndo) 753{ 754 struct servent *sv; 755 register struct hnamemem *table; 756 register int i; 757 char buf[sizeof("0000000000")]; 758 759 while ((sv = getservent()) != NULL) { 760 int port = ntohs(sv->s_port); 761 i = port & (HASHNAMESIZE-1); 762 if (strcmp(sv->s_proto, "tcp") == 0) 763 table = &tporttable[i]; 764 else if (strcmp(sv->s_proto, "udp") == 0) 765 table = &uporttable[i]; 766 else 767 continue; 768 769 while (table->name) 770 table = table->nxt; 771 if (ndo->ndo_nflag) { 772 (void)snprintf(buf, sizeof(buf), "%d", port); 773 table->name = strdup(buf); 774 } else 775 table->name = strdup(sv->s_name); 776 if (table->name == NULL) 777 (*ndo->ndo_error)(ndo, "init_servarray: strdup"); 778 779 table->addr = port; 780 table->nxt = newhnamemem(ndo); 781 } 782 endservent(); 783} 784 785static const struct eproto { 786 const char *s; 787 u_short p; 788} eproto_db[] = { 789 { "pup", ETHERTYPE_PUP }, 790 { "xns", ETHERTYPE_NS }, 791 { "ip", ETHERTYPE_IP }, 792 { "ip6", ETHERTYPE_IPV6 }, 793 { "arp", ETHERTYPE_ARP }, 794 { "rarp", ETHERTYPE_REVARP }, 795 { "sprite", ETHERTYPE_SPRITE }, 796 { "mopdl", ETHERTYPE_MOPDL }, 797 { "moprc", ETHERTYPE_MOPRC }, 798 { "decnet", ETHERTYPE_DN }, 799 { "lat", ETHERTYPE_LAT }, 800 { "sca", ETHERTYPE_SCA }, 801 { "lanbridge", ETHERTYPE_LANBRIDGE }, 802 { "vexp", ETHERTYPE_VEXP }, 803 { "vprod", ETHERTYPE_VPROD }, 804 { "atalk", ETHERTYPE_ATALK }, 805 { "atalkarp", ETHERTYPE_AARP }, 806 { "loopback", ETHERTYPE_LOOPBACK }, 807 { "decdts", ETHERTYPE_DECDTS }, 808 { "decdns", ETHERTYPE_DECDNS }, 809 { (char *)0, 0 } 810}; 811 812static void 813init_eprotoarray(netdissect_options *ndo) 814{ 815 register int i; 816 register struct hnamemem *table; 817 818 for (i = 0; eproto_db[i].s; i++) { 819 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1); 820 table = &eprototable[j]; 821 while (table->name) 822 table = table->nxt; 823 table->name = eproto_db[i].s; 824 table->addr = htons(eproto_db[i].p); 825 table->nxt = newhnamemem(ndo); 826 } 827} 828 829static const struct protoidlist { 830 const u_char protoid[5]; 831 const char *name; 832} protoidlist[] = { 833 {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" }, 834 {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" }, 835 {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" }, 836 {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" }, 837 {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" }, 838 {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL } 839}; 840 841/* 842 * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet 843 * types. 844 */ 845static void 846init_protoidarray(netdissect_options *ndo) 847{ 848 register int i; 849 register struct protoidmem *tp; 850 const struct protoidlist *pl; 851 u_char protoid[5]; 852 853 protoid[0] = 0; 854 protoid[1] = 0; 855 protoid[2] = 0; 856 for (i = 0; eproto_db[i].s; i++) { 857 u_short etype = htons(eproto_db[i].p); 858 859 memcpy((char *)&protoid[3], (char *)&etype, 2); 860 tp = lookup_protoid(ndo, protoid); 861 tp->p_name = strdup(eproto_db[i].s); 862 if (tp->p_name == NULL) 863 (*ndo->ndo_error)(ndo, 864 "init_protoidarray: strdup(eproto_db[i].s)"); 865 } 866 /* Hardwire some SNAP proto ID names */ 867 for (pl = protoidlist; pl->name != NULL; ++pl) { 868 tp = lookup_protoid(ndo, pl->protoid); 869 /* Don't override existing name */ 870 if (tp->p_name != NULL) 871 continue; 872 873 tp->p_name = pl->name; 874 } 875} 876 877static const struct etherlist { 878 const u_char addr[6]; 879 const char *name; 880} etherlist[] = { 881 {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" }, 882 {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL } 883}; 884 885/* 886 * Initialize the ethers hash table. We take two different approaches 887 * depending on whether or not the system provides the ethers name 888 * service. If it does, we just wire in a few names at startup, 889 * and etheraddr_string() fills in the table on demand. If it doesn't, 890 * then we suck in the entire /etc/ethers file at startup. The idea 891 * is that parsing the local file will be fast, but spinning through 892 * all the ethers entries via NIS & next_etherent might be very slow. 893 * 894 * XXX pcap_next_etherent doesn't belong in the pcap interface, but 895 * since the pcap module already does name-to-address translation, 896 * it's already does most of the work for the ethernet address-to-name 897 * translation, so we just pcap_next_etherent as a convenience. 898 */ 899static void 900init_etherarray(netdissect_options *ndo) 901{ 902 register const struct etherlist *el; 903 register struct enamemem *tp; 904#ifdef USE_ETHER_NTOHOST 905 char name[256]; 906#else 907 register struct pcap_etherent *ep; 908 register FILE *fp; 909 910 /* Suck in entire ethers file */ 911 fp = fopen(PCAP_ETHERS_FILE, "r"); 912 if (fp != NULL) { 913 while ((ep = pcap_next_etherent(fp)) != NULL) { 914 tp = lookup_emem(ndo, ep->addr); 915 tp->e_name = strdup(ep->name); 916 if (tp->e_name == NULL) 917 (*ndo->ndo_error)(ndo, 918 "init_etherarray: strdup(ep->addr)"); 919 } 920 (void)fclose(fp); 921 } 922#endif 923 924 /* Hardwire some ethernet names */ 925 for (el = etherlist; el->name != NULL; ++el) { 926 tp = lookup_emem(ndo, el->addr); 927 /* Don't override existing name */ 928 if (tp->e_name != NULL) 929 continue; 930 931#ifdef USE_ETHER_NTOHOST 932 /* 933 * Use YP/NIS version of name if available. 934 */ 935 if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) { 936 tp->e_name = strdup(name); 937 if (tp->e_name == NULL) 938 (*ndo->ndo_error)(ndo, 939 "init_etherarray: strdup(name)"); 940 continue; 941 } 942#endif 943 tp->e_name = el->name; 944 } 945} 946 947static const struct tok ipxsap_db[] = { 948 { 0x0000, "Unknown" }, 949 { 0x0001, "User" }, 950 { 0x0002, "User Group" }, 951 { 0x0003, "PrintQueue" }, 952 { 0x0004, "FileServer" }, 953 { 0x0005, "JobServer" }, 954 { 0x0006, "Gateway" }, 955 { 0x0007, "PrintServer" }, 956 { 0x0008, "ArchiveQueue" }, 957 { 0x0009, "ArchiveServer" }, 958 { 0x000a, "JobQueue" }, 959 { 0x000b, "Administration" }, 960 { 0x000F, "Novell TI-RPC" }, 961 { 0x0017, "Diagnostics" }, 962 { 0x0020, "NetBIOS" }, 963 { 0x0021, "NAS SNA Gateway" }, 964 { 0x0023, "NACS AsyncGateway" }, 965 { 0x0024, "RemoteBridge/RoutingService" }, 966 { 0x0026, "BridgeServer" }, 967 { 0x0027, "TCP/IP Gateway" }, 968 { 0x0028, "Point-to-point X.25 BridgeServer" }, 969 { 0x0029, "3270 Gateway" }, 970 { 0x002a, "CHI Corp" }, 971 { 0x002c, "PC Chalkboard" }, 972 { 0x002d, "TimeSynchServer" }, 973 { 0x002e, "ARCserve5.0/PalindromeBackup" }, 974 { 0x0045, "DI3270 Gateway" }, 975 { 0x0047, "AdvertisingPrintServer" }, 976 { 0x004a, "NetBlazerModems" }, 977 { 0x004b, "BtrieveVAP" }, 978 { 0x004c, "NetwareSQL" }, 979 { 0x004d, "XtreeNetwork" }, 980 { 0x0050, "BtrieveVAP4.11" }, 981 { 0x0052, "QuickLink" }, 982 { 0x0053, "PrintQueueUser" }, 983 { 0x0058, "Multipoint X.25 Router" }, 984 { 0x0060, "STLB/NLM" }, 985 { 0x0064, "ARCserve" }, 986 { 0x0066, "ARCserve3.0" }, 987 { 0x0072, "WAN CopyUtility" }, 988 { 0x007a, "TES-NetwareVMS" }, 989 { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" }, 990 { 0x0095, "DDA OBGYN" }, 991 { 0x0098, "NetwareAccessServer" }, 992 { 0x009a, "Netware for VMS II/NamedPipeServer" }, 993 { 0x009b, "NetwareAccessServer" }, 994 { 0x009e, "PortableNetwareServer/SunLinkNVT" }, 995 { 0x00a1, "PowerchuteAPC UPS" }, 996 { 0x00aa, "LAWserve" }, 997 { 0x00ac, "CompaqIDA StatusMonitor" }, 998 { 0x0100, "PIPE STAIL" }, 999 { 0x0102, "LAN ProtectBindery" }, 1000 { 0x0103, "OracleDataBaseServer" }, 1001 { 0x0107, "Netware386/RSPX RemoteConsole" }, 1002 { 0x010f, "NovellSNA Gateway" }, 1003 { 0x0111, "TestServer" }, 1004 { 0x0112, "HP PrintServer" }, 1005 { 0x0114, "CSA MUX" }, 1006 { 0x0115, "CSA LCA" }, 1007 { 0x0116, "CSA CM" }, 1008 { 0x0117, "CSA SMA" }, 1009 { 0x0118, "CSA DBA" }, 1010 { 0x0119, "CSA NMA" }, 1011 { 0x011a, "CSA SSA" }, 1012 { 0x011b, "CSA STATUS" }, 1013 { 0x011e, "CSA APPC" }, 1014 { 0x0126, "SNA TEST SSA Profile" }, 1015 { 0x012a, "CSA TRACE" }, 1016 { 0x012b, "NetwareSAA" }, 1017 { 0x012e, "IKARUS VirusScan" }, 1018 { 0x0130, "CommunicationsExecutive" }, 1019 { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" }, 1020 { 0x0135, "NetwareNamingServicesProfile" }, 1021 { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" }, 1022 { 0x0141, "LAN SpoolServer" }, 1023 { 0x0152, "IRMALAN Gateway" }, 1024 { 0x0154, "NamedPipeServer" }, 1025 { 0x0166, "NetWareManagement" }, 1026 { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" }, 1027 { 0x0173, "Compaq" }, 1028 { 0x0174, "Compaq SNMP Agent" }, 1029 { 0x0175, "Compaq" }, 1030 { 0x0180, "XTreeServer/XTreeTools" }, 1031 { 0x018A, "NASI ServicesBroadcastServer" }, 1032 { 0x01b0, "GARP Gateway" }, 1033 { 0x01b1, "Binfview" }, 1034 { 0x01bf, "IntelLanDeskManager" }, 1035 { 0x01ca, "AXTEC" }, 1036 { 0x01cb, "ShivaNetModem/E" }, 1037 { 0x01cc, "ShivaLanRover/E" }, 1038 { 0x01cd, "ShivaLanRover/T" }, 1039 { 0x01ce, "ShivaUniversal" }, 1040 { 0x01d8, "CastelleFAXPressServer" }, 1041 { 0x01da, "CastelleLANPressPrintServer" }, 1042 { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" }, 1043 { 0x01f0, "LEGATO" }, 1044 { 0x01f5, "LEGATO" }, 1045 { 0x0233, "NMS Agent/NetwareManagementAgent" }, 1046 { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" }, 1047 { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" }, 1048 { 0x023a, "LANtern" }, 1049 { 0x023c, "MAVERICK" }, 1050 { 0x023f, "NovellSMDR" }, 1051 { 0x024e, "NetwareConnect" }, 1052 { 0x024f, "NASI ServerBroadcast Cisco" }, 1053 { 0x026a, "NMS ServiceConsole" }, 1054 { 0x026b, "TimeSynchronizationServer Netware 4.x" }, 1055 { 0x0278, "DirectoryServer Netware 4.x" }, 1056 { 0x027b, "NetwareManagementAgent" }, 1057 { 0x0280, "Novell File and Printer Sharing Service for PC" }, 1058 { 0x0304, "NovellSAA Gateway" }, 1059 { 0x0308, "COM/VERMED" }, 1060 { 0x030a, "GalacticommWorldgroupServer" }, 1061 { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" }, 1062 { 0x0320, "AttachmateGateway" }, 1063 { 0x0327, "MicrosoftDiagnostiocs" }, 1064 { 0x0328, "WATCOM SQL Server" }, 1065 { 0x0335, "MultiTechSystems MultisynchCommServer" }, 1066 { 0x0343, "Xylogics RemoteAccessServer/LANModem" }, 1067 { 0x0355, "ArcadaBackupExec" }, 1068 { 0x0358, "MSLCD1" }, 1069 { 0x0361, "NETINELO" }, 1070 { 0x037e, "Powerchute UPS Monitoring" }, 1071 { 0x037f, "ViruSafeNotify" }, 1072 { 0x0386, "HP Bridge" }, 1073 { 0x0387, "HP Hub" }, 1074 { 0x0394, "NetWare SAA Gateway" }, 1075 { 0x039b, "LotusNotes" }, 1076 { 0x03b7, "CertusAntiVirus" }, 1077 { 0x03c4, "ARCserve4.0" }, 1078 { 0x03c7, "LANspool3.5" }, 1079 { 0x03d7, "LexmarkPrinterServer" }, 1080 { 0x03d8, "LexmarkXLE PrinterServer" }, 1081 { 0x03dd, "BanyanENS NetwareClient" }, 1082 { 0x03de, "GuptaSequelBaseServer/NetWareSQL" }, 1083 { 0x03e1, "UnivelUnixware" }, 1084 { 0x03e4, "UnivelUnixware" }, 1085 { 0x03fc, "IntelNetport" }, 1086 { 0x03fd, "PrintServerQueue" }, 1087 { 0x040A, "ipnServer" }, 1088 { 0x040D, "LVERRMAN" }, 1089 { 0x040E, "LVLIC" }, 1090 { 0x0414, "NET Silicon (DPI)/Kyocera" }, 1091 { 0x0429, "SiteLockVirus" }, 1092 { 0x0432, "UFHELPR???" }, 1093 { 0x0433, "Synoptics281xAdvancedSNMPAgent" }, 1094 { 0x0444, "MicrosoftNT SNA Server" }, 1095 { 0x0448, "Oracle" }, 1096 { 0x044c, "ARCserve5.01" }, 1097 { 0x0457, "CanonGP55" }, 1098 { 0x045a, "QMS Printers" }, 1099 { 0x045b, "DellSCSI Array" }, 1100 { 0x0491, "NetBlazerModems" }, 1101 { 0x04ac, "OnTimeScheduler" }, 1102 { 0x04b0, "CD-Net" }, 1103 { 0x0513, "EmulexNQA" }, 1104 { 0x0520, "SiteLockChecks" }, 1105 { 0x0529, "SiteLockChecks" }, 1106 { 0x052d, "CitrixOS2 AppServer" }, 1107 { 0x0535, "Tektronix" }, 1108 { 0x0536, "Milan" }, 1109 { 0x055d, "Attachmate SNA gateway" }, 1110 { 0x056b, "IBM8235 ModemServer" }, 1111 { 0x056c, "ShivaLanRover/E PLUS" }, 1112 { 0x056d, "ShivaLanRover/T PLUS" }, 1113 { 0x0580, "McAfeeNetShield" }, 1114 { 0x05B8, "NLM to workstation communication (Revelation Software)" }, 1115 { 0x05BA, "CompatibleSystemsRouters" }, 1116 { 0x05BE, "CheyenneHierarchicalStorageManager" }, 1117 { 0x0606, "JCWatermarkImaging" }, 1118 { 0x060c, "AXISNetworkPrinter" }, 1119 { 0x0610, "AdaptecSCSIManagement" }, 1120 { 0x0621, "IBM AntiVirus" }, 1121 { 0x0640, "Windows95 RemoteRegistryService" }, 1122 { 0x064e, "MicrosoftIIS" }, 1123 { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" }, 1124 { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" }, 1125 { 0x076C, "Xerox" }, 1126 { 0x079b, "ShivaLanRover/E 115" }, 1127 { 0x079c, "ShivaLanRover/T 115" }, 1128 { 0x07B4, "CubixWorldDesk" }, 1129 { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" }, 1130 { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" }, 1131 { 0x0810, "ELAN License Server Demo" }, 1132 { 0x0824, "ShivaLanRoverAccessSwitch/E" }, 1133 { 0x086a, "ISSC Collector" }, 1134 { 0x087f, "ISSC DAS AgentAIX" }, 1135 { 0x0880, "Intel Netport PRO" }, 1136 { 0x0881, "Intel Netport PRO" }, 1137 { 0x0b29, "SiteLock" }, 1138 { 0x0c29, "SiteLockApplications" }, 1139 { 0x0c2c, "LicensingServer" }, 1140 { 0x2101, "PerformanceTechnologyInstantInternet" }, 1141 { 0x2380, "LAI SiteLock" }, 1142 { 0x238c, "MeetingMaker" }, 1143 { 0x4808, "SiteLockServer/SiteLockMetering" }, 1144 { 0x5555, "SiteLockUser" }, 1145 { 0x6312, "Tapeware" }, 1146 { 0x6f00, "RabbitGateway" }, 1147 { 0x7703, "MODEM" }, 1148 { 0x8002, "NetPortPrinters" }, 1149 { 0x8008, "WordPerfectNetworkVersion" }, 1150 { 0x85BE, "Cisco EIGRP" }, 1151 { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" }, 1152 { 0x9000, "McAfeeNetShield" }, 1153 { 0x9604, "CSA-NT_MON" }, 1154 { 0xb6a8, "OceanIsleReachoutRemoteControl" }, 1155 { 0xf11f, "SiteLockMetering" }, 1156 { 0xf1ff, "SiteLock" }, 1157 { 0xf503, "Microsoft SQL Server" }, 1158 { 0xF905, "IBM TimeAndPlace" }, 1159 { 0xfbfb, "TopCallIII FaxServer" }, 1160 { 0xffff, "AnyService/Wildcard" }, 1161 { 0, (char *)0 } 1162}; 1163 1164static void 1165init_ipxsaparray(netdissect_options *ndo) 1166{ 1167 register int i; 1168 register struct hnamemem *table; 1169 1170 for (i = 0; ipxsap_db[i].s != NULL; i++) { 1171 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1); 1172 table = &ipxsaptable[j]; 1173 while (table->name) 1174 table = table->nxt; 1175 table->name = ipxsap_db[i].s; 1176 table->addr = htons(ipxsap_db[i].v); 1177 table->nxt = newhnamemem(ndo); 1178 } 1179} 1180 1181/* 1182 * Initialize the address to name translation machinery. We map all 1183 * non-local IP addresses to numeric addresses if ndo->ndo_fflag is true 1184 * (i.e., to prevent blocking on the nameserver). localnet is the IP address 1185 * of the local network. mask is its subnet mask. 1186 */ 1187void 1188init_addrtoname(netdissect_options *ndo, uint32_t localnet, uint32_t mask) 1189{ 1190 if (ndo->ndo_fflag) { 1191 f_localnet = localnet; 1192 f_netmask = mask; 1193 } 1194 if (ndo->ndo_nflag) 1195 /* 1196 * Simplest way to suppress names. 1197 */ 1198 return; 1199 1200 init_etherarray(ndo); 1201 init_servarray(ndo); 1202 init_eprotoarray(ndo); 1203 init_protoidarray(ndo); 1204 init_ipxsaparray(ndo); 1205} 1206 1207const char * 1208dnaddr_string(netdissect_options *ndo, u_short dnaddr) 1209{ 1210 register struct hnamemem *tp; 1211 1212 for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0; 1213 tp = tp->nxt) 1214 if (tp->addr == dnaddr) 1215 return (tp->name); 1216 1217 tp->addr = dnaddr; 1218 tp->nxt = newhnamemem(ndo); 1219 if (ndo->ndo_nflag) 1220 tp->name = dnnum_string(ndo, dnaddr); 1221 else 1222 tp->name = dnname_string(ndo, dnaddr); 1223 1224 return(tp->name); 1225} 1226 1227/* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */ 1228struct hnamemem * 1229newhnamemem(netdissect_options *ndo) 1230{ 1231 register struct hnamemem *p; 1232 static struct hnamemem *ptr = NULL; 1233 static u_int num = 0; 1234 1235 if (num <= 0) { 1236 num = 64; 1237 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr)); 1238 if (ptr == NULL) 1239 (*ndo->ndo_error)(ndo, "newhnamemem: calloc"); 1240 } 1241 --num; 1242 p = ptr++; 1243 return (p); 1244} 1245 1246/* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */ 1247struct h6namemem * 1248newh6namemem(netdissect_options *ndo) 1249{ 1250 register struct h6namemem *p; 1251 static struct h6namemem *ptr = NULL; 1252 static u_int num = 0; 1253 1254 if (num <= 0) { 1255 num = 64; 1256 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr)); 1257 if (ptr == NULL) 1258 (*ndo->ndo_error)(ndo, "newh6namemem: calloc"); 1259 } 1260 --num; 1261 p = ptr++; 1262 return (p); 1263} 1264 1265/* Represent TCI part of the 802.1Q 4-octet tag as text. */ 1266const char * 1267ieee8021q_tci_string(const uint16_t tci) 1268{ 1269 static char buf[128]; 1270 snprintf(buf, sizeof(buf), "vlan %u, p %u%s", 1271 tci & 0xfff, 1272 tci >> 13, 1273 (tci & 0x1000) ? ", DEI" : ""); 1274 return buf; 1275} 1276