The Tcpdump Group git mirrors - libpcap/blob - nametoaddr.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
   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  * Name to id translation routines used by the scanner.
  22  * These functions are not time critical.
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #ifdef DECNETLIB
  30 #include <sys/types.h>
  31 #include <netdnet/dnetdb.h>
  32 #endif
  33
  34 #ifdef _WIN32
  35   #include <winsock2.h>
  36   #include <ws2tcpip.h>
  37
  38   #ifdef INET6
  39     /*
  40      * To quote the MSDN page for getaddrinfo() at
  41      *
  42      *    https://msdn.microsoft.com/en-us/library/windows/desktop/ms738520(v=vs.85).aspx
  43      *
  44      * "Support for getaddrinfo on Windows 2000 and older versions
  45      * The getaddrinfo function was added to the Ws2_32.dll on Windows XP and
  46      * later. To execute an application that uses this function on earlier
  47      * versions of Windows, then you need to include the Ws2tcpip.h and
  48      * Wspiapi.h files. When the Wspiapi.h include file is added, the
  49      * getaddrinfo function is defined to the WspiapiGetAddrInfo inline
  50      * function in the Wspiapi.h file. At runtime, the WspiapiGetAddrInfo
  51      * function is implemented in such a way that if the Ws2_32.dll or the
  52      * Wship6.dll (the file containing getaddrinfo in the IPv6 Technology
  53      * Preview for Windows 2000) does not include getaddrinfo, then a
  54      * version of getaddrinfo is implemented inline based on code in the
  55      * Wspiapi.h header file. This inline code will be used on older Windows
  56      * platforms that do not natively support the getaddrinfo function."
  57      *
  58      * We use getaddrinfo(), so we include Wspiapi.h here.
  59      */
  60     #include <wspiapi.h>
  61   #endif /* INET6 */
  62 #else /* _WIN32 */
  63   #include <sys/param.h>
  64   #include <sys/types.h>
  65   #include <sys/socket.h>
  66   #include <sys/time.h>
  67
  68   #include <netinet/in.h>
  69
  70   #ifdef HAVE_ETHER_HOSTTON
  71     #if defined(NET_ETHERNET_H_DECLARES_ETHER_HOSTTON)
  72       /*
  73        * OK, just include <net/ethernet.h>.
  74        */
  75       #include <net/ethernet.h>
  76     #elif defined(NETINET_ETHER_H_DECLARES_ETHER_HOSTTON)
  77       /*
  78        * OK, just include <netinet/ether.h>
  79        */
  80       #include <netinet/ether.h>
  81     #elif defined(SYS_ETHERNET_H_DECLARES_ETHER_HOSTTON)
  82       /*
  83        * OK, just include <sys/ethernet.h>
  84        */
  85       #include <sys/ethernet.h>
  86     #elif defined(ARPA_INET_H_DECLARES_ETHER_HOSTTON)
  87       /*
  88        * OK, just include <arpa/inet.h>
  89        */
  90       #include <arpa/inet.h>
  91     #elif defined(NETINET_IF_ETHER_H_DECLARES_ETHER_HOSTTON)
  92       /*
  93        * OK, include <netinet/if_ether.h>, after all the other stuff we
  94        * need to include or define for its benefit.
  95        */
  96       #define NEED_NETINET_IF_ETHER_H
  97     #else
  98       /*
  99        * We'll have to declare it ourselves.
 100        * If <netinet/if_ether.h> defines struct ether_addr, include
 101        * it.  Otherwise, define it ourselves.
 102        */
 103       #ifdef HAVE_STRUCT_ETHER_ADDR
 104         #define NEED_NETINET_IF_ETHER_H
 105       #else /* HAVE_STRUCT_ETHER_ADDR */
 106         struct ether_addr {
 107                 unsigned char ether_addr_octet[6];
 108         };
 109       #endif /* HAVE_STRUCT_ETHER_ADDR */
 110     #endif /* what declares ether_hostton() */
 111
 112     #ifdef NEED_NETINET_IF_ETHER_H
 113       #include <net/if.h>       /* Needed on some platforms */
 114       #include <netinet/in.h>   /* Needed on some platforms */
 115       #include <netinet/if_ether.h>
 116     #endif /* NEED_NETINET_IF_ETHER_H */
 117
 118     #ifndef HAVE_DECL_ETHER_HOSTTON
 119       /*
 120        * No header declares it, so declare it ourselves.
 121        */
 122       extern int ether_hostton(const char *, struct ether_addr *);
 123     #endif /* !defined(HAVE_DECL_ETHER_HOSTTON) */
 124   #endif /* HAVE_ETHER_HOSTTON */
 125
 126   #include <arpa/inet.h>
 127   #include <netdb.h>
 128 #endif /* _WIN32 */
 129
 130 #include <ctype.h>
 131 #include <errno.h>
 132 #include <stdlib.h>
 133 #include <string.h>
 134 #include <stdio.h>
 135
 136 #include "pcap-int.h"
 137
 138 #include "gencode.h"
 139 #include <pcap/namedb.h>
 140 #include "nametoaddr.h"
 141
 142 #ifdef HAVE_OS_PROTO_H
 143 #include "os-proto.h"
 144 #endif
 145
 146 #ifndef NTOHL
 147 #define NTOHL(x) (x) = ntohl(x)
 148 #define NTOHS(x) (x) = ntohs(x)
 149 #endif
 150
 151 /*
 152  *  Convert host name to internet address.
 153  *  Return 0 upon failure.
 154  *  XXX - not thread-safe; don't use it inside libpcap.
 155  */
 156 bpf_u_int32 **
 157 pcap_nametoaddr(const char *name)
 158 {
 159 #ifndef h_addr
 160         static bpf_u_int32 *hlist[2];
 161 #endif
 162         bpf_u_int32 **p;
 163         struct hostent *hp;
 164
 165         if ((hp = gethostbyname(name)) != NULL) {
 166 #ifndef h_addr
 167                 hlist[0] = (bpf_u_int32 *)hp->h_addr;
 168                 NTOHL(hp->h_addr);
 169                 return hlist;
 170 #else
 171                 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
 172                         NTOHL(**p);
 173                 return (bpf_u_int32 **)hp->h_addr_list;
 174 #endif
 175         }
 176         else
 177                 return 0;
 178 }
 179
 180 struct addrinfo *
 181 pcap_nametoaddrinfo(const char *name)
 182 {
 183         struct addrinfo hints, *res;
 184         int error;
 185
 186         memset(&hints, 0, sizeof(hints));
 187         hints.ai_family = PF_UNSPEC;
 188         hints.ai_socktype = SOCK_STREAM;        /*not really*/
 189         hints.ai_protocol = IPPROTO_TCP;        /*not really*/
 190         error = getaddrinfo(name, NULL, &hints, &res);
 191         if (error)
 192                 return NULL;
 193         else
 194                 return res;
 195 }
 196
 197 /*
 198  *  Convert net name to internet address.
 199  *  Return 0 upon failure.
 200  *  XXX - not guaranteed to be thread-safe!  See below for platforms
 201  *  on which it is thread-safe and on which it isn't.
 202  */
 203 bpf_u_int32
 204 pcap_nametonetaddr(const char *name)
 205 {
 206 #ifdef _WIN32
 207         /*
 208          * There's no "getnetbyname()" on Windows.
 209          *
 210          * XXX - I guess we could use the BSD code to read
 211          * C:\Windows\System32\drivers\etc/networks, assuming
 212          * that's its home on all the versions of Windows
 213          * we use, but that file probably just has the loopback
 214          * network on 127/24 on 99 44/100% of Windows machines.
 215          *
 216          * (Heck, these days it probably just has that on 99 44/100%
 217          * of *UN*X* machines.)
 218          */
 219         return 0;
 220 #else
 221         /*
 222          * UN*X.
 223          */
 224         struct netent *np;
 225   #if defined(HAVE_LINUX_GETNETBYNAME_R)
 226         /*
 227          * We have Linux's reentrant getnetbyname_r().
 228          */
 229         struct netent result_buf;
 230         char buf[1024]; /* arbitrary size */
 231         int h_errnoval;
 232         int err;
 233
 234         err = getnetbyname_r(name, &result_buf, buf, sizeof buf, &np,
 235             &h_errnoval);
 236         if (err != 0) {
 237                 /*
 238                  * XXX - dynamically allocate the buffer, and make it
 239                  * bigger if we get ERANGE back?
 240                  */
 241                 return 0;
 242         }
 243   #elif defined(HAVE_SOLARIS_IRIX_GETNETBYNAME_R)
 244         /*
 245          * We have Solaris's and IRIX's reentrant getnetbyname_r().
 246          */
 247         struct netent result_buf;
 248         char buf[1024]; /* arbitrary size */
 249
 250         np = getnetbyname_r(name, &result_buf, buf, (int)sizeof buf);
 251   #elif defined(HAVE_AIX_GETNETBYNAME_R)
 252         /*
 253          * We have AIX's reentrant getnetbyname_r().
 254          */
 255         struct netent result_buf;
 256         struct netent_data net_data;
 257
 258         if (getnetbyname_r(name, &result_buf, &net_data) == -1)
 259                 np = NULL;
 260         else
 261                 np = &result_buf;
 262   #else
 263         /*
 264          * We don't have any getnetbyname_r(); either we have a
 265          * getnetbyname() that uses thread-specific data, in which
 266          * case we're thread-safe (sufficiently recent FreeBSD,
 267          * sufficiently recent Darwin-based OS, sufficiently recent
 268          * HP-UX, sufficiently recent Tru64 UNIX), or we have the
 269          * traditional getnetbyname() (everything else, including
 270          * current NetBSD and OpenBSD), in which case we're not
 271          * thread-safe.
 272          */
 273         np = getnetbyname(name);
 274   #endif
 275         if (np != NULL)
 276                 return np->n_net;
 277         else
 278                 return 0;
 279 #endif /* _WIN32 */
 280 }
 281
 282 /*
 283  * Convert a port name to its port and protocol numbers.
 284  * We assume only TCP or UDP.
 285  * Return 0 upon failure.
 286  */
 287 int
 288 pcap_nametoport(const char *name, int *port, int *proto)
 289 {
 290         struct addrinfo hints, *res, *ai;
 291         int error;
 292         struct sockaddr_in *in4;
 293 #ifdef INET6
 294         struct sockaddr_in6 *in6;
 295 #endif
 296         int tcp_port = -1;
 297         int udp_port = -1;
 298
 299         /*
 300          * We check for both TCP and UDP in case there are
 301          * ambiguous entries.
 302          */
 303         memset(&hints, 0, sizeof(hints));
 304         hints.ai_family = PF_UNSPEC;
 305         hints.ai_socktype = SOCK_STREAM;
 306         hints.ai_protocol = IPPROTO_TCP;
 307         error = getaddrinfo(NULL, name, &hints, &res);
 308         if (error != 0) {
 309                 if (error != EAI_NONAME) {
 310                         /*
 311                          * This is a real error, not just "there's
 312                          * no such service name".
 313                          * XXX - this doesn't return an error string.
 314                          */
 315                         return 0;
 316                 }
 317         } else {
 318                 /*
 319                  * OK, we found it.  Did it find anything?
 320                  */
 321                 for (ai = res; ai != NULL; ai = ai->ai_next) {
 322                         /*
 323                          * Does it have an address?
 324                          */
 325                         if (ai->ai_addr != NULL) {
 326                                 /*
 327                                  * Yes.  Get a port number; we're done.
 328                                  */
 329                                 if (ai->ai_addr->sa_family == AF_INET) {
 330                                         in4 = (struct sockaddr_in *)ai->ai_addr;
 331                                         tcp_port = ntohs(in4->sin_port);
 332                                         break;
 333                                 }
 334 #ifdef INET6
 335                                 if (ai->ai_addr->sa_family == AF_INET6) {
 336                                         in6 = (struct sockaddr_in6 *)ai->ai_addr;
 337                                         tcp_port = ntohs(in6->sin6_port);
 338                                         break;
 339                                 }
 340 #endif
 341                         }
 342                 }
 343                 freeaddrinfo(res);
 344         }
 345
 346         memset(&hints, 0, sizeof(hints));
 347         hints.ai_family = PF_UNSPEC;
 348         hints.ai_socktype = SOCK_DGRAM;
 349         hints.ai_protocol = IPPROTO_UDP;
 350         error = getaddrinfo(NULL, name, &hints, &res);
 351         if (error != 0) {
 352                 if (error != EAI_NONAME) {
 353                         /*
 354                          * This is a real error, not just "there's
 355                          * no such service name".
 356                          * XXX - this doesn't return an error string.
 357                          */
 358                         return 0;
 359                 }
 360         } else {
 361                 /*
 362                  * OK, we found it.  Did it find anything?
 363                  */
 364                 for (ai = res; ai != NULL; ai = ai->ai_next) {
 365                         /*
 366                          * Does it have an address?
 367                          */
 368                         if (ai->ai_addr != NULL) {
 369                                 /*
 370                                  * Yes.  Get a port number; we're done.
 371                                  */
 372                                 if (ai->ai_addr->sa_family == AF_INET) {
 373                                         in4 = (struct sockaddr_in *)ai->ai_addr;
 374                                         udp_port = ntohs(in4->sin_port);
 375                                         break;
 376                                 }
 377 #ifdef INET6
 378                                 if (ai->ai_addr->sa_family == AF_INET6) {
 379                                         in6 = (struct sockaddr_in6 *)ai->ai_addr;
 380                                         udp_port = ntohs(in6->sin6_port);
 381                                         break;
 382                                 }
 383 #endif
 384                         }
 385                 }
 386                 freeaddrinfo(res);
 387         }
 388
 389         /*
 390          * We need to check /etc/services for ambiguous entries.
 391          * If we find an ambiguous entry, and it has the
 392          * same port number, change the proto to PROTO_UNDEF
 393          * so both TCP and UDP will be checked.
 394          */
 395         if (tcp_port >= 0) {
 396                 *port = tcp_port;
 397                 *proto = IPPROTO_TCP;
 398                 if (udp_port >= 0) {
 399                         if (udp_port == tcp_port)
 400                                 *proto = PROTO_UNDEF;
 401 #ifdef notdef
 402                         else
 403                                 /* Can't handle ambiguous names that refer
 404                                    to different port numbers. */
 405                                 warning("ambiguous port %s in /etc/services",
 406                                         name);
 407 #endif
 408                 }
 409                 return 1;
 410         }
 411         if (udp_port >= 0) {
 412                 *port = udp_port;
 413                 *proto = IPPROTO_UDP;
 414                 return 1;
 415         }
 416 #if defined(ultrix) || defined(__osf__)
 417         /* Special hack in case NFS isn't in /etc/services */
 418         if (strcmp(name, "nfs") == 0) {
 419                 *port = 2049;
 420                 *proto = PROTO_UNDEF;
 421                 return 1;
 422         }
 423 #endif
 424         return 0;
 425 }
 426
 427 /*
 428  * Convert a string in the form PPP-PPP, where correspond to ports, to
 429  * a starting and ending port in a port range.
 430  * Return 0 on failure.
 431  */
 432 int
 433 pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto)
 434 {
 435         u_int p1, p2;
 436         char *off, *cpy;
 437         int save_proto;
 438
 439         if (sscanf(name, "%d-%d", &p1, &p2) != 2) {
 440                 if ((cpy = strdup(name)) == NULL)
 441                         return 0;
 442
 443                 if ((off = strchr(cpy, '-')) == NULL) {
 444                         free(cpy);
 445                         return 0;
 446                 }
 447
 448                 *off = '\0';
 449
 450                 if (pcap_nametoport(cpy, port1, proto) == 0) {
 451                         free(cpy);
 452                         return 0;
 453                 }
 454                 save_proto = *proto;
 455
 456                 if (pcap_nametoport(off + 1, port2, proto) == 0) {
 457                         free(cpy);
 458                         return 0;
 459                 }
 460                 free(cpy);
 461
 462                 if (*proto != save_proto)
 463                         *proto = PROTO_UNDEF;
 464         } else {
 465                 *port1 = p1;
 466                 *port2 = p2;
 467                 *proto = PROTO_UNDEF;
 468         }
 469
 470         return 1;
 471 }
 472
 473 /*
 474  * XXX - not guaranteed to be thread-safe!  See below for platforms
 475  * on which it is thread-safe and on which it isn't.
 476  */
 477 int
 478 pcap_nametoproto(const char *str)
 479 {
 480         struct protoent *p;
 481   #if defined(HAVE_LINUX_GETNETBYNAME_R)
 482         /*
 483          * We have Linux's reentrant getprotobyname_r().
 484          */
 485         struct protoent result_buf;
 486         char buf[1024]; /* arbitrary size */
 487         int err;
 488
 489         err = getprotobyname_r(str, &result_buf, buf, sizeof buf, &p);
 490         if (err != 0) {
 491                 /*
 492                  * XXX - dynamically allocate the buffer, and make it
 493                  * bigger if we get ERANGE back?
 494                  */
 495                 return 0;
 496         }
 497   #elif defined(HAVE_SOLARIS_IRIX_GETNETBYNAME_R)
 498         /*
 499          * We have Solaris's and IRIX's reentrant getprotobyname_r().
 500          */
 501         struct protoent result_buf;
 502         char buf[1024]; /* arbitrary size */
 503
 504         p = getprotobyname_r(str, &result_buf, buf, (int)sizeof buf);
 505   #elif defined(HAVE_AIX_GETNETBYNAME_R)
 506         /*
 507          * We have AIX's reentrant getprotobyname_r().
 508          */
 509         struct protoent result_buf;
 510         struct protoent_data proto_data;
 511
 512         if (getprotobyname_r(str, &result_buf, &proto_data) == -1)
 513                 p = NULL;
 514         else
 515                 p = &result_buf;
 516   #else
 517         /*
 518          * We don't have any getprotobyname_r(); either we have a
 519          * getprotobyname() that uses thread-specific data, in which
 520          * case we're thread-safe (sufficiently recent FreeBSD,
 521          * sufficiently recent Darwin-based OS, sufficiently recent
 522          * HP-UX, sufficiently recent Tru64 UNIX, Windows), or we have
 523          * the traditional getprotobyname() (everything else, including
 524          * current NetBSD and OpenBSD), in which case we're not
 525          * thread-safe.
 526          */
 527         p = getprotobyname(str);
 528   #endif
 529         if (p != 0)
 530                 return p->p_proto;
 531         else
 532                 return PROTO_UNDEF;
 533 }
 534
 535 #include "ethertype.h"
 536
 537 struct eproto {
 538         const char *s;
 539         u_short p;
 540 };
 541
 542 /*
 543  * Static data base of ether protocol types.
 544  * tcpdump used to import this, and it's declared as an export on
 545  * Debian, at least, so make it a public symbol, even though we
 546  * don't officially export it by declaring it in a header file.
 547  * (Programs *should* do this themselves, as tcpdump now does.)
 548  */
 549 PCAP_API_DEF struct eproto eproto_db[] = {
 550         { "pup", ETHERTYPE_PUP },
 551         { "xns", ETHERTYPE_NS },
 552         { "ip", ETHERTYPE_IP },
 553 #ifdef INET6
 554         { "ip6", ETHERTYPE_IPV6 },
 555 #endif
 556         { "arp", ETHERTYPE_ARP },
 557         { "rarp", ETHERTYPE_REVARP },
 558         { "sprite", ETHERTYPE_SPRITE },
 559         { "mopdl", ETHERTYPE_MOPDL },
 560         { "moprc", ETHERTYPE_MOPRC },
 561         { "decnet", ETHERTYPE_DN },
 562         { "lat", ETHERTYPE_LAT },
 563         { "sca", ETHERTYPE_SCA },
 564         { "lanbridge", ETHERTYPE_LANBRIDGE },
 565         { "vexp", ETHERTYPE_VEXP },
 566         { "vprod", ETHERTYPE_VPROD },
 567         { "atalk", ETHERTYPE_ATALK },
 568         { "atalkarp", ETHERTYPE_AARP },
 569         { "loopback", ETHERTYPE_LOOPBACK },
 570         { "decdts", ETHERTYPE_DECDTS },
 571         { "decdns", ETHERTYPE_DECDNS },
 572         { (char *)0, 0 }
 573 };
 574
 575 int
 576 pcap_nametoeproto(const char *s)
 577 {
 578         struct eproto *p = eproto_db;
 579
 580         while (p->s != 0) {
 581                 if (strcmp(p->s, s) == 0)
 582                         return p->p;
 583                 p += 1;
 584         }
 585         return PROTO_UNDEF;
 586 }
 587
 588 #include "llc.h"
 589
 590 /* Static data base of LLC values. */
 591 static struct eproto llc_db[] = {
 592         { "iso", LLCSAP_ISONS },
 593         { "stp", LLCSAP_8021D },
 594         { "ipx", LLCSAP_IPX },
 595         { "netbeui", LLCSAP_NETBEUI },
 596         { (char *)0, 0 }
 597 };
 598
 599 int
 600 pcap_nametollc(const char *s)
 601 {
 602         struct eproto *p = llc_db;
 603
 604         while (p->s != 0) {
 605                 if (strcmp(p->s, s) == 0)
 606                         return p->p;
 607                 p += 1;
 608         }
 609         return PROTO_UNDEF;
 610 }
 611
 612 /* Hex digit to 8-bit unsigned integer. */
 613 static inline u_char
 614 xdtoi(u_char c)
 615 {
 616         if (isdigit(c))
 617                 return (u_char)(c - '0');
 618         else if (islower(c))
 619                 return (u_char)(c - 'a' + 10);
 620         else
 621                 return (u_char)(c - 'A' + 10);
 622 }
 623
 624 int
 625 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 626 {
 627         u_int n;
 628         int len;
 629
 630         *addr = 0;
 631         len = 0;
 632         for (;;) {
 633                 n = 0;
 634                 while (*s && *s != '.')
 635                         n = n * 10 + *s++ - '0';
 636                 *addr <<= 8;
 637                 *addr |= n & 0xff;
 638                 len += 8;
 639                 if (*s == '\0')
 640                         return len;
 641                 ++s;
 642         }
 643         /* NOTREACHED */
 644 }
 645
 646 int
 647 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 648 {
 649 #define AREASHIFT 10
 650 #define AREAMASK 0176000
 651 #define NODEMASK 01777
 652
 653         u_int node, area;
 654
 655         if (sscanf(s, "%d.%d", &area, &node) != 2)
 656                 return(0);
 657
 658         *addr = (area << AREASHIFT) & AREAMASK;
 659         *addr |= (node & NODEMASK);
 660
 661         return(32);
 662 }
 663
 664 /*
 665  * Convert 's', which can have the one of the forms:
 666  *
 667  *      "xx:xx:xx:xx:xx:xx"
 668  *      "xx.xx.xx.xx.xx.xx"
 669  *      "xx-xx-xx-xx-xx-xx"
 670  *      "xxxx.xxxx.xxxx"
 671  *      "xxxxxxxxxxxx"
 672  *
 673  * (or various mixes of ':', '.', and '-') into a new
 674  * ethernet address.  Assumes 's' is well formed.
 675  */
 676 u_char *
 677 pcap_ether_aton(const char *s)
 678 {
 679         register u_char *ep, *e;
 680         register u_char d;
 681
 682         e = ep = (u_char *)malloc(6);
 683         if (e == NULL)
 684                 return (NULL);
 685
 686         while (*s) {
 687                 if (*s == ':' || *s == '.' || *s == '-')
 688                         s += 1;
 689                 d = xdtoi(*s++);
 690                 if (isxdigit((unsigned char)*s)) {
 691                         d <<= 4;
 692                         d |= xdtoi(*s++);
 693                 }
 694                 *ep++ = d;
 695         }
 696
 697         return (e);
 698 }
 699
 700 #ifndef HAVE_ETHER_HOSTTON
 701 /*
 702  * Roll our own.
 703  * XXX - not thread-safe, because pcap_next_etherent() isn't thread-
 704  * safe!  Needs a mutex or a thread-safe pcap_next_etherent().
 705  */
 706 u_char *
 707 pcap_ether_hostton(const char *name)
 708 {
 709         register struct pcap_etherent *ep;
 710         register u_char *ap;
 711         static FILE *fp = NULL;
 712         static int init = 0;
 713
 714         if (!init) {
 715                 fp = fopen(PCAP_ETHERS_FILE, "r");
 716                 ++init;
 717                 if (fp == NULL)
 718                         return (NULL);
 719         } else if (fp == NULL)
 720                 return (NULL);
 721         else
 722                 rewind(fp);
 723
 724         while ((ep = pcap_next_etherent(fp)) != NULL) {
 725                 if (strcmp(ep->name, name) == 0) {
 726                         ap = (u_char *)malloc(6);
 727                         if (ap != NULL) {
 728                                 memcpy(ap, ep->addr, 6);
 729                                 return (ap);
 730                         }
 731                         break;
 732                 }
 733         }
 734         return (NULL);
 735 }
 736 #else
 737 /*
 738  * Use the OS-supplied routine.
 739  * This *should* be thread-safe; the API doesn't have a static buffer.
 740  */
 741 u_char *
 742 pcap_ether_hostton(const char *name)
 743 {
 744         register u_char *ap;
 745         u_char a[6];
 746
 747         ap = NULL;
 748         if (ether_hostton(name, (struct ether_addr *)a) == 0) {
 749                 ap = (u_char *)malloc(6);
 750                 if (ap != NULL)
 751                         memcpy((char *)ap, (char *)a, 6);
 752         }
 753         return (ap);
 754 }
 755 #endif
 756
 757 /*
 758  * XXX - not guaranteed to be thread-safe!
 759  */
 760 int
 761 __pcap_nametodnaddr(const char *name, u_short *res)
 762 {
 763 #ifdef  DECNETLIB
 764         struct nodeent *getnodebyname();
 765         struct nodeent *nep;
 766
 767         nep = getnodebyname(name);
 768         if (nep == ((struct nodeent *)0))
 769                 return(0);
 770
 771         memcpy((char *)res, (char *)nep->n_addr, sizeof(unsigned short));
 772         return(1);
 773 #else
 774         return(0);
 775 #endif
 776 }