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 <errno.h>
 131 #include <stdlib.h>
 132 #include <string.h>
 133 #include <stdio.h>
 134
 135 #include "pcap-int.h"
 136
 137 #include "diag-control.h"
 138
 139 #include "gencode.h"
 140 #include <pcap/namedb.h>
 141 #include "nametoaddr.h"
 142
 143 #ifdef HAVE_OS_PROTO_H
 144 #include "os-proto.h"
 145 #endif
 146
 147 #ifndef NTOHL
 148 #define NTOHL(x) (x) = ntohl(x)
 149 #define NTOHS(x) (x) = ntohs(x)
 150 #endif
 151
 152 /*
 153  *  Convert host name to internet address.
 154  *  Return 0 upon failure.
 155  *  XXX - not thread-safe; don't use it inside libpcap.
 156  */
 157 bpf_u_int32 **
 158 pcap_nametoaddr(const char *name)
 159 {
 160 #ifndef h_addr
 161         static bpf_u_int32 *hlist[2];
 162 #endif
 163         bpf_u_int32 **p;
 164         struct hostent *hp;
 165
 166         /*
 167          * gethostbyname() is deprecated on Windows, perhaps because
 168          * it's not thread-safe, or because it doesn't support IPv6,
 169          * or both.
 170          *
 171          * We deprecate pcap_nametoaddr() on all platforms because
 172          * it's not thread-safe; we supply it for backwards compatibility,
 173          * so suppress the deprecation warning.  We could, I guess,
 174          * use getaddrinfo() and construct the array ourselves, but
 175          * that's probably not worth the effort, as that wouldn't make
 176          * this thread-safe - we can't change the API to require that
 177          * our caller free the address array, so we still have to reuse
 178          * a local array.
 179          */
 180 DIAG_OFF_DEPRECATION
 181         if ((hp = gethostbyname(name)) != NULL) {
 182 DIAG_ON_DEPRECATION
 183 #ifndef h_addr
 184                 hlist[0] = (bpf_u_int32 *)hp->h_addr;
 185                 NTOHL(hp->h_addr);
 186                 return hlist;
 187 #else
 188                 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
 189                         NTOHL(**p);
 190                 return (bpf_u_int32 **)hp->h_addr_list;
 191 #endif
 192         }
 193         else
 194                 return 0;
 195 }
 196
 197 struct addrinfo *
 198 pcap_nametoaddrinfo(const char *name)
 199 {
 200         struct addrinfo hints, *res;
 201         int error;
 202
 203         memset(&hints, 0, sizeof(hints));
 204         hints.ai_family = PF_UNSPEC;
 205         hints.ai_socktype = SOCK_STREAM;        /*not really*/
 206         hints.ai_protocol = IPPROTO_TCP;        /*not really*/
 207         error = getaddrinfo(name, NULL, &hints, &res);
 208         if (error)
 209                 return NULL;
 210         else
 211                 return res;
 212 }
 213
 214 /*
 215  *  Convert net name to internet address.
 216  *  Return 0 upon failure.
 217  *  XXX - not guaranteed to be thread-safe!  See below for platforms
 218  *  on which it is thread-safe and on which it isn't.
 219  */
 220 #if defined(_WIN32) || defined(__CYGWIN__)
 221 bpf_u_int32
 222 pcap_nametonetaddr(const char *name _U_)
 223 {
 224         /*
 225          * There's no "getnetbyname()" on Windows.
 226          *
 227          * XXX - I guess we could use the BSD code to read
 228          * C:\Windows\System32\drivers\etc/networks, assuming
 229          * that's its home on all the versions of Windows
 230          * we use, but that file probably just has the loopback
 231          * network on 127/24 on 99 44/100% of Windows machines.
 232          *
 233          * (Heck, these days it probably just has that on 99 44/100%
 234          * of *UN*X* machines.)
 235          */
 236         return 0;
 237 }
 238 #else /* _WIN32 */
 239 bpf_u_int32
 240 pcap_nametonetaddr(const char *name)
 241 {
 242         /*
 243          * UN*X.
 244          */
 245         struct netent *np;
 246   #if defined(HAVE_LINUX_GETNETBYNAME_R)
 247         /*
 248          * We have Linux's reentrant getnetbyname_r().
 249          */
 250         struct netent result_buf;
 251         char buf[1024]; /* arbitrary size */
 252         int h_errnoval;
 253         int err;
 254
 255         /*
 256          * Apparently, the man page at
 257          *
 258          *    http://man7.org/linux/man-pages/man3/getnetbyname_r.3.html
 259          *
 260          * lies when it says
 261          *
 262          *    If the function call successfully obtains a network record,
 263          *    then *result is set pointing to result_buf; otherwise, *result
 264          *    is set to NULL.
 265          *
 266          * and, in fact, at least in some versions of GNU libc, it does
 267          * *not* always get set if getnetbyname_r() succeeds.
 268          */
 269         np = NULL;
 270         err = getnetbyname_r(name, &result_buf, buf, sizeof buf, &np,
 271             &h_errnoval);
 272         if (err != 0) {
 273                 /*
 274                  * XXX - dynamically allocate the buffer, and make it
 275                  * bigger if we get ERANGE back?
 276                  */
 277                 return 0;
 278         }
 279   #elif defined(HAVE_SOLARIS_IRIX_GETNETBYNAME_R)
 280         /*
 281          * We have Solaris's and IRIX's reentrant getnetbyname_r().
 282          */
 283         struct netent result_buf;
 284         char buf[1024]; /* arbitrary size */
 285
 286         np = getnetbyname_r(name, &result_buf, buf, (int)sizeof buf);
 287   #elif defined(HAVE_AIX_GETNETBYNAME_R)
 288         /*
 289          * We have AIX's reentrant getnetbyname_r().
 290          */
 291         struct netent result_buf;
 292         struct netent_data net_data;
 293
 294         if (getnetbyname_r(name, &result_buf, &net_data) == -1)
 295                 np = NULL;
 296         else
 297                 np = &result_buf;
 298   #else
 299         /*
 300          * We don't have any getnetbyname_r(); either we have a
 301          * getnetbyname() that uses thread-specific data, in which
 302          * case we're thread-safe (sufficiently recent FreeBSD,
 303          * sufficiently recent Darwin-based OS, sufficiently recent
 304          * HP-UX, sufficiently recent Tru64 UNIX), or we have the
 305          * traditional getnetbyname() (everything else, including
 306          * current NetBSD and OpenBSD), in which case we're not
 307          * thread-safe.
 308          */
 309         np = getnetbyname(name);
 310   #endif
 311         if (np != NULL)
 312                 return np->n_net;
 313         else
 314                 return 0;
 315 }
 316 #endif /* _WIN32 */
 317
 318 /*
 319  * Convert a port name to its port and protocol numbers.
 320  * We assume only TCP or UDP.
 321  * Return 0 upon failure.
 322  */
 323 int
 324 pcap_nametoport(const char *name, int *port, int *proto)
 325 {
 326         struct addrinfo hints, *res, *ai;
 327         int error;
 328         struct sockaddr_in *in4;
 329 #ifdef INET6
 330         struct sockaddr_in6 *in6;
 331 #endif
 332         int tcp_port = -1;
 333         int udp_port = -1;
 334
 335         /*
 336          * We check for both TCP and UDP in case there are
 337          * ambiguous entries.
 338          */
 339         memset(&hints, 0, sizeof(hints));
 340         hints.ai_family = PF_UNSPEC;
 341         hints.ai_socktype = SOCK_STREAM;
 342         hints.ai_protocol = IPPROTO_TCP;
 343         error = getaddrinfo(NULL, name, &hints, &res);
 344         if (error != 0) {
 345                 if (error != EAI_NONAME &&
 346                     error != EAI_SERVICE) {
 347                         /*
 348                          * This is a real error, not just "there's
 349                          * no such service name".
 350                          * XXX - this doesn't return an error string.
 351                          */
 352                         return 0;
 353                 }
 354         } else {
 355                 /*
 356                  * OK, we found it.  Did it find anything?
 357                  */
 358                 for (ai = res; ai != NULL; ai = ai->ai_next) {
 359                         /*
 360                          * Does it have an address?
 361                          */
 362                         if (ai->ai_addr != NULL) {
 363                                 /*
 364                                  * Yes.  Get a port number; we're done.
 365                                  */
 366                                 if (ai->ai_addr->sa_family == AF_INET) {
 367                                         in4 = (struct sockaddr_in *)ai->ai_addr;
 368                                         tcp_port = ntohs(in4->sin_port);
 369                                         break;
 370                                 }
 371 #ifdef INET6
 372                                 if (ai->ai_addr->sa_family == AF_INET6) {
 373                                         in6 = (struct sockaddr_in6 *)ai->ai_addr;
 374                                         tcp_port = ntohs(in6->sin6_port);
 375                                         break;
 376                                 }
 377 #endif
 378                         }
 379                 }
 380                 freeaddrinfo(res);
 381         }
 382
 383         memset(&hints, 0, sizeof(hints));
 384         hints.ai_family = PF_UNSPEC;
 385         hints.ai_socktype = SOCK_DGRAM;
 386         hints.ai_protocol = IPPROTO_UDP;
 387         error = getaddrinfo(NULL, name, &hints, &res);
 388         if (error != 0) {
 389                 if (error != EAI_NONAME &&
 390                     error != EAI_SERVICE) {
 391                         /*
 392                          * This is a real error, not just "there's
 393                          * no such service name".
 394                          * XXX - this doesn't return an error string.
 395                          */
 396                         return 0;
 397                 }
 398         } else {
 399                 /*
 400                  * OK, we found it.  Did it find anything?
 401                  */
 402                 for (ai = res; ai != NULL; ai = ai->ai_next) {
 403                         /*
 404                          * Does it have an address?
 405                          */
 406                         if (ai->ai_addr != NULL) {
 407                                 /*
 408                                  * Yes.  Get a port number; we're done.
 409                                  */
 410                                 if (ai->ai_addr->sa_family == AF_INET) {
 411                                         in4 = (struct sockaddr_in *)ai->ai_addr;
 412                                         udp_port = ntohs(in4->sin_port);
 413                                         break;
 414                                 }
 415 #ifdef INET6
 416                                 if (ai->ai_addr->sa_family == AF_INET6) {
 417                                         in6 = (struct sockaddr_in6 *)ai->ai_addr;
 418                                         udp_port = ntohs(in6->sin6_port);
 419                                         break;
 420                                 }
 421 #endif
 422                         }
 423                 }
 424                 freeaddrinfo(res);
 425         }
 426
 427         /*
 428          * We need to check /etc/services for ambiguous entries.
 429          * If we find an ambiguous entry, and it has the
 430          * same port number, change the proto to PROTO_UNDEF
 431          * so both TCP and UDP will be checked.
 432          */
 433         if (tcp_port >= 0) {
 434                 *port = tcp_port;
 435                 *proto = IPPROTO_TCP;
 436                 if (udp_port >= 0) {
 437                         if (udp_port == tcp_port)
 438                                 *proto = PROTO_UNDEF;
 439 #ifdef notdef
 440                         else
 441                                 /* Can't handle ambiguous names that refer
 442                                    to different port numbers. */
 443                                 warning("ambiguous port %s in /etc/services",
 444                                         name);
 445 #endif
 446                 }
 447                 return 1;
 448         }
 449         if (udp_port >= 0) {
 450                 *port = udp_port;
 451                 *proto = IPPROTO_UDP;
 452                 return 1;
 453         }
 454 #if defined(ultrix) || defined(__osf__)
 455         /* Special hack in case NFS isn't in /etc/services */
 456         if (strcmp(name, "nfs") == 0) {
 457                 *port = 2049;
 458                 *proto = PROTO_UNDEF;
 459                 return 1;
 460         }
 461 #endif
 462         return 0;
 463 }
 464
 465 /*
 466  * Convert a string in the form PPP-PPP, where correspond to ports, to
 467  * a starting and ending port in a port range.
 468  * Return 0 on failure.
 469  */
 470 int
 471 pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto)
 472 {
 473         u_int p1, p2;
 474         char *off, *cpy;
 475         int save_proto;
 476
 477         if (sscanf(name, "%d-%d", &p1, &p2) != 2) {
 478                 if ((cpy = strdup(name)) == NULL)
 479                         return 0;
 480
 481                 if ((off = strchr(cpy, '-')) == NULL) {
 482                         free(cpy);
 483                         return 0;
 484                 }
 485
 486                 *off = '\0';
 487
 488                 if (pcap_nametoport(cpy, port1, proto) == 0) {
 489                         free(cpy);
 490                         return 0;
 491                 }
 492                 save_proto = *proto;
 493
 494                 if (pcap_nametoport(off + 1, port2, proto) == 0) {
 495                         free(cpy);
 496                         return 0;
 497                 }
 498                 free(cpy);
 499
 500                 if (*proto != save_proto)
 501                         *proto = PROTO_UNDEF;
 502         } else {
 503                 *port1 = p1;
 504                 *port2 = p2;
 505                 *proto = PROTO_UNDEF;
 506         }
 507
 508         return 1;
 509 }
 510
 511 /*
 512  * XXX - not guaranteed to be thread-safe!  See below for platforms
 513  * on which it is thread-safe and on which it isn't.
 514  */
 515 int
 516 pcap_nametoproto(const char *str)
 517 {
 518         struct protoent *p;
 519   #if defined(HAVE_LINUX_GETNETBYNAME_R)
 520         /*
 521          * We have Linux's reentrant getprotobyname_r().
 522          */
 523         struct protoent result_buf;
 524         char buf[1024]; /* arbitrary size */
 525         int err;
 526
 527         err = getprotobyname_r(str, &result_buf, buf, sizeof buf, &p);
 528         if (err != 0) {
 529                 /*
 530                  * XXX - dynamically allocate the buffer, and make it
 531                  * bigger if we get ERANGE back?
 532                  */
 533                 return 0;
 534         }
 535   #elif defined(HAVE_SOLARIS_IRIX_GETNETBYNAME_R)
 536         /*
 537          * We have Solaris's and IRIX's reentrant getprotobyname_r().
 538          */
 539         struct protoent result_buf;
 540         char buf[1024]; /* arbitrary size */
 541
 542         p = getprotobyname_r(str, &result_buf, buf, (int)sizeof buf);
 543   #elif defined(HAVE_AIX_GETNETBYNAME_R)
 544         /*
 545          * We have AIX's reentrant getprotobyname_r().
 546          */
 547         struct protoent result_buf;
 548         struct protoent_data proto_data;
 549
 550         if (getprotobyname_r(str, &result_buf, &proto_data) == -1)
 551                 p = NULL;
 552         else
 553                 p = &result_buf;
 554   #else
 555         /*
 556          * We don't have any getprotobyname_r(); either we have a
 557          * getprotobyname() that uses thread-specific data, in which
 558          * case we're thread-safe (sufficiently recent FreeBSD,
 559          * sufficiently recent Darwin-based OS, sufficiently recent
 560          * HP-UX, sufficiently recent Tru64 UNIX, Windows), or we have
 561          * the traditional getprotobyname() (everything else, including
 562          * current NetBSD and OpenBSD), in which case we're not
 563          * thread-safe.
 564          */
 565         p = getprotobyname(str);
 566   #endif
 567         if (p != 0)
 568                 return p->p_proto;
 569         else
 570                 return PROTO_UNDEF;
 571 }
 572
 573 #include "ethertype.h"
 574
 575 struct eproto {
 576         const char *s;
 577         u_short p;
 578 };
 579
 580 /*
 581  * Static data base of ether protocol types.
 582  * tcpdump used to import this, and it's declared as an export on
 583  * Debian, at least, so make it a public symbol, even though we
 584  * don't officially export it by declaring it in a header file.
 585  * (Programs *should* do this themselves, as tcpdump now does.)
 586  *
 587  * We declare it here, right before defining it, to squelch any
 588  * warnings we might get from compilers about the lack of a
 589  * declaration.
 590  */
 591 PCAP_API struct eproto eproto_db[];
 592 PCAP_API_DEF struct eproto eproto_db[] = {
 593         { "pup", ETHERTYPE_PUP },
 594         { "xns", ETHERTYPE_NS },
 595         { "ip", ETHERTYPE_IP },
 596 #ifdef INET6
 597         { "ip6", ETHERTYPE_IPV6 },
 598 #endif
 599         { "arp", ETHERTYPE_ARP },
 600         { "rarp", ETHERTYPE_REVARP },
 601         { "sprite", ETHERTYPE_SPRITE },
 602         { "mopdl", ETHERTYPE_MOPDL },
 603         { "moprc", ETHERTYPE_MOPRC },
 604         { "decnet", ETHERTYPE_DN },
 605         { "lat", ETHERTYPE_LAT },
 606         { "sca", ETHERTYPE_SCA },
 607         { "lanbridge", ETHERTYPE_LANBRIDGE },
 608         { "vexp", ETHERTYPE_VEXP },
 609         { "vprod", ETHERTYPE_VPROD },
 610         { "atalk", ETHERTYPE_ATALK },
 611         { "atalkarp", ETHERTYPE_AARP },
 612         { "loopback", ETHERTYPE_LOOPBACK },
 613         { "decdts", ETHERTYPE_DECDTS },
 614         { "decdns", ETHERTYPE_DECDNS },
 615         { (char *)0, 0 }
 616 };
 617
 618 int
 619 pcap_nametoeproto(const char *s)
 620 {
 621         struct eproto *p = eproto_db;
 622
 623         while (p->s != 0) {
 624                 if (strcmp(p->s, s) == 0)
 625                         return p->p;
 626                 p += 1;
 627         }
 628         return PROTO_UNDEF;
 629 }
 630
 631 #include "llc.h"
 632
 633 /* Static data base of LLC values. */
 634 static struct eproto llc_db[] = {
 635         { "iso", LLCSAP_ISONS },
 636         { "stp", LLCSAP_8021D },
 637         { "ipx", LLCSAP_IPX },
 638         { "netbeui", LLCSAP_NETBEUI },
 639         { (char *)0, 0 }
 640 };
 641
 642 int
 643 pcap_nametollc(const char *s)
 644 {
 645         struct eproto *p = llc_db;
 646
 647         while (p->s != 0) {
 648                 if (strcmp(p->s, s) == 0)
 649                         return p->p;
 650                 p += 1;
 651         }
 652         return PROTO_UNDEF;
 653 }
 654
 655 /* Hex digit to 8-bit unsigned integer. */
 656 static inline u_char
 657 xdtoi(u_char c)
 658 {
 659         if (c >= '0' && c <= '9')
 660                 return (u_char)(c - '0');
 661         else if (c >= 'a' && c <= 'f')
 662                 return (u_char)(c - 'a' + 10);
 663         else
 664                 return (u_char)(c - 'A' + 10);
 665 }
 666
 667 int
 668 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 669 {
 670         u_int n;
 671         int len;
 672
 673         *addr = 0;
 674         len = 0;
 675         for (;;) {
 676                 n = 0;
 677                 while (*s && *s != '.') {
 678                         if (n > 25) {
 679                                 /* The result will be > 255 */
 680                                 return -1;
 681                         }
 682                         n = n * 10 + *s++ - '0';
 683                 }
 684                 if (n > 255)
 685                         return -1;
 686                 *addr <<= 8;
 687                 *addr |= n & 0xff;
 688                 len += 8;
 689                 if (*s == '\0')
 690                         return len;
 691                 ++s;
 692         }
 693         /* NOTREACHED */
 694 }
 695
 696 int
 697 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 698 {
 699 #define AREASHIFT 10
 700 #define AREAMASK 0176000
 701 #define NODEMASK 01777
 702
 703         u_int node, area;
 704
 705         if (sscanf(s, "%d.%d", &area, &node) != 2)
 706                 return(0);
 707
 708         *addr = (area << AREASHIFT) & AREAMASK;
 709         *addr |= (node & NODEMASK);
 710
 711         return(32);
 712 }
 713
 714 /*
 715  * Convert 's', which can have the one of the forms:
 716  *
 717  *      "xx:xx:xx:xx:xx:xx"
 718  *      "xx.xx.xx.xx.xx.xx"
 719  *      "xx-xx-xx-xx-xx-xx"
 720  *      "xxxx.xxxx.xxxx"
 721  *      "xxxxxxxxxxxx"
 722  *
 723  * (or various mixes of ':', '.', and '-') into a new
 724  * ethernet address.  Assumes 's' is well formed.
 725  */
 726 u_char *
 727 pcap_ether_aton(const char *s)
 728 {
 729         register u_char *ep, *e;
 730         register u_char d;
 731
 732         e = ep = (u_char *)malloc(6);
 733         if (e == NULL)
 734                 return (NULL);
 735
 736         while (*s) {
 737                 if (*s == ':' || *s == '.' || *s == '-')
 738                         s += 1;
 739                 d = xdtoi(*s++);
 740                 if (PCAP_ISXDIGIT(*s)) {
 741                         d <<= 4;
 742                         d |= xdtoi(*s++);
 743                 }
 744                 *ep++ = d;
 745         }
 746
 747         return (e);
 748 }
 749
 750 #ifndef HAVE_ETHER_HOSTTON
 751 /*
 752  * Roll our own.
 753  * XXX - not thread-safe, because pcap_next_etherent() isn't thread-
 754  * safe!  Needs a mutex or a thread-safe pcap_next_etherent().
 755  */
 756 u_char *
 757 pcap_ether_hostton(const char *name)
 758 {
 759         register struct pcap_etherent *ep;
 760         register u_char *ap;
 761         static FILE *fp = NULL;
 762         static int init = 0;
 763
 764         if (!init) {
 765                 fp = fopen(PCAP_ETHERS_FILE, "r");
 766                 ++init;
 767                 if (fp == NULL)
 768                         return (NULL);
 769         } else if (fp == NULL)
 770                 return (NULL);
 771         else
 772                 rewind(fp);
 773
 774         while ((ep = pcap_next_etherent(fp)) != NULL) {
 775                 if (strcmp(ep->name, name) == 0) {
 776                         ap = (u_char *)malloc(6);
 777                         if (ap != NULL) {
 778                                 memcpy(ap, ep->addr, 6);
 779                                 return (ap);
 780                         }
 781                         break;
 782                 }
 783         }
 784         return (NULL);
 785 }
 786 #else
 787 /*
 788  * Use the OS-supplied routine.
 789  * This *should* be thread-safe; the API doesn't have a static buffer.
 790  */
 791 u_char *
 792 pcap_ether_hostton(const char *name)
 793 {
 794         register u_char *ap;
 795         u_char a[6];
 796
 797         ap = NULL;
 798         if (ether_hostton(name, (struct ether_addr *)a) == 0) {
 799                 ap = (u_char *)malloc(6);
 800                 if (ap != NULL)
 801                         memcpy((char *)ap, (char *)a, 6);
 802         }
 803         return (ap);
 804 }
 805 #endif
 806
 807 /*
 808  * XXX - not guaranteed to be thread-safe!
 809  */
 810 int
 811 #ifdef  DECNETLIB
 812 __pcap_nametodnaddr(const char *name, u_short *res)
 813 {
 814         struct nodeent *getnodebyname();
 815         struct nodeent *nep;
 816
 817         nep = getnodebyname(name);
 818         if (nep == ((struct nodeent *)0))
 819                 return(0);
 820
 821         memcpy((char *)res, (char *)nep->n_addr, sizeof(unsigned short));
 822         return(1);
 823 #else
 824 __pcap_nametodnaddr(const char *name _U_, u_short *res _U_)
 825 {
 826         return(0);
 827 #endif
 828 }