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>                        /* concession to AIX */
  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
 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 "fopen.h"
 137
 138 #include "pcap-int.h"
 139
 140 #include "gencode.h"
 141 #include <pcap/namedb.h>
 142 #include "nametoaddr.h"
 143
 144 #ifdef HAVE_OS_PROTO_H
 145 #include "os-proto.h"
 146 #endif
 147
 148 #ifndef NTOHL
 149 #define NTOHL(x) (x) = ntohl(x)
 150 #define NTOHS(x) (x) = ntohs(x)
 151 #endif
 152
 153 static inline int xdtoi(int);
 154
 155 /*
 156  *  Convert host name to internet address.
 157  *  Return 0 upon failure.
 158  */
 159 bpf_u_int32 **
 160 pcap_nametoaddr(const char *name)
 161 {
 162 #ifndef h_addr
 163         static bpf_u_int32 *hlist[2];
 164 #endif
 165         bpf_u_int32 **p;
 166         struct hostent *hp;
 167
 168         if ((hp = gethostbyname(name)) != NULL) {
 169 #ifndef h_addr
 170                 hlist[0] = (bpf_u_int32 *)hp->h_addr;
 171                 NTOHL(hp->h_addr);
 172                 return hlist;
 173 #else
 174                 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
 175                         NTOHL(**p);
 176                 return (bpf_u_int32 **)hp->h_addr_list;
 177 #endif
 178         }
 179         else
 180                 return 0;
 181 }
 182
 183 #ifdef INET6
 184 struct addrinfo *
 185 pcap_nametoaddrinfo(const char *name)
 186 {
 187         struct addrinfo hints, *res;
 188         int error;
 189
 190         memset(&hints, 0, sizeof(hints));
 191         hints.ai_family = PF_UNSPEC;
 192         hints.ai_socktype = SOCK_STREAM;        /*not really*/
 193         hints.ai_protocol = IPPROTO_TCP;        /*not really*/
 194         error = getaddrinfo(name, NULL, &hints, &res);
 195         if (error)
 196                 return NULL;
 197         else
 198                 return res;
 199 }
 200 #endif /*INET6*/
 201
 202 /*
 203  *  Convert net name to internet address.
 204  *  Return 0 upon failure.
 205  */
 206 bpf_u_int32
 207 pcap_nametonetaddr(const char *name)
 208 {
 209 #ifndef _WIN32
 210         struct netent *np;
 211
 212         if ((np = getnetbyname(name)) != NULL)
 213                 return np->n_net;
 214         else
 215                 return 0;
 216 #else
 217         /*
 218          * There's no "getnetbyname()" on Windows.
 219          *
 220          * XXX - I guess we could use the BSD code to read
 221          * C:\Windows\System32\drivers\etc/networks, assuming
 222          * that's its home on all the versions of Windows
 223          * we use, but that file probably just has the loopback
 224          * network on 127/24 on 99 44/100% of Windows machines.
 225          *
 226          * (Heck, these days it probably just has that on 99 44/100%
 227          * of *UN*X* machines.)
 228          */
 229         return 0;
 230 #endif
 231 }
 232
 233 /*
 234  * Convert a port name to its port and protocol numbers.
 235  * We assume only TCP or UDP.
 236  * Return 0 upon failure.
 237  */
 238 int
 239 pcap_nametoport(const char *name, int *port, int *proto)
 240 {
 241         struct servent *sp;
 242         int tcp_port = -1;
 243         int udp_port = -1;
 244
 245         /*
 246          * We need to check /etc/services for ambiguous entries.
 247          * If we find the ambiguous entry, and it has the
 248          * same port number, change the proto to PROTO_UNDEF
 249          * so both TCP and UDP will be checked.
 250          */
 251         sp = getservbyname(name, "tcp");
 252         if (sp != NULL) tcp_port = ntohs(sp->s_port);
 253         sp = getservbyname(name, "udp");
 254         if (sp != NULL) udp_port = ntohs(sp->s_port);
 255         if (tcp_port >= 0) {
 256                 *port = tcp_port;
 257                 *proto = IPPROTO_TCP;
 258                 if (udp_port >= 0) {
 259                         if (udp_port == tcp_port)
 260                                 *proto = PROTO_UNDEF;
 261 #ifdef notdef
 262                         else
 263                                 /* Can't handle ambiguous names that refer
 264                                    to different port numbers. */
 265                                 warning("ambiguous port %s in /etc/services",
 266                                         name);
 267 #endif
 268                 }
 269                 return 1;
 270         }
 271         if (udp_port >= 0) {
 272                 *port = udp_port;
 273                 *proto = IPPROTO_UDP;
 274                 return 1;
 275         }
 276 #if defined(ultrix) || defined(__osf__)
 277         /* Special hack in case NFS isn't in /etc/services */
 278         if (strcmp(name, "nfs") == 0) {
 279                 *port = 2049;
 280                 *proto = PROTO_UNDEF;
 281                 return 1;
 282         }
 283 #endif
 284         return 0;
 285 }
 286
 287 /*
 288  * Convert a string in the form PPP-PPP, where correspond to ports, to
 289  * a starting and ending port in a port range.
 290  * Return 0 on failure.
 291  */
 292 int
 293 pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto)
 294 {
 295         u_int p1, p2;
 296         char *off, *cpy;
 297         int save_proto;
 298
 299         if (sscanf(name, "%d-%d", &p1, &p2) != 2) {
 300                 if ((cpy = strdup(name)) == NULL)
 301                         return 0;
 302
 303                 if ((off = strchr(cpy, '-')) == NULL) {
 304                         free(cpy);
 305                         return 0;
 306                 }
 307
 308                 *off = '\0';
 309
 310                 if (pcap_nametoport(cpy, port1, proto) == 0) {
 311                         free(cpy);
 312                         return 0;
 313                 }
 314                 save_proto = *proto;
 315
 316                 if (pcap_nametoport(off + 1, port2, proto) == 0) {
 317                         free(cpy);
 318                         return 0;
 319                 }
 320                 free(cpy);
 321
 322                 if (*proto != save_proto)
 323                         *proto = PROTO_UNDEF;
 324         } else {
 325                 *port1 = p1;
 326                 *port2 = p2;
 327                 *proto = PROTO_UNDEF;
 328         }
 329
 330         return 1;
 331 }
 332
 333 int
 334 pcap_nametoproto(const char *str)
 335 {
 336         struct protoent *p;
 337
 338         p = getprotobyname(str);
 339         if (p != 0)
 340                 return p->p_proto;
 341         else
 342                 return PROTO_UNDEF;
 343 }
 344
 345 #include "ethertype.h"
 346
 347 struct eproto {
 348         const char *s;
 349         u_short p;
 350 };
 351
 352 /*
 353  * Static data base of ether protocol types.
 354  * tcpdump used to import this, and it's declared as an export on
 355  * Debian, at least, so make it a public symbol, even though we
 356  * don't officially export it by declaring it in a header file.
 357  * (Programs *should* do this themselves, as tcpdump now does.)
 358  */
 359 PCAP_API_DEF struct eproto eproto_db[] = {
 360         { "pup", ETHERTYPE_PUP },
 361         { "xns", ETHERTYPE_NS },
 362         { "ip", ETHERTYPE_IP },
 363 #ifdef INET6
 364         { "ip6", ETHERTYPE_IPV6 },
 365 #endif
 366         { "arp", ETHERTYPE_ARP },
 367         { "rarp", ETHERTYPE_REVARP },
 368         { "sprite", ETHERTYPE_SPRITE },
 369         { "mopdl", ETHERTYPE_MOPDL },
 370         { "moprc", ETHERTYPE_MOPRC },
 371         { "decnet", ETHERTYPE_DN },
 372         { "lat", ETHERTYPE_LAT },
 373         { "sca", ETHERTYPE_SCA },
 374         { "lanbridge", ETHERTYPE_LANBRIDGE },
 375         { "vexp", ETHERTYPE_VEXP },
 376         { "vprod", ETHERTYPE_VPROD },
 377         { "atalk", ETHERTYPE_ATALK },
 378         { "atalkarp", ETHERTYPE_AARP },
 379         { "loopback", ETHERTYPE_LOOPBACK },
 380         { "decdts", ETHERTYPE_DECDTS },
 381         { "decdns", ETHERTYPE_DECDNS },
 382         { (char *)0, 0 }
 383 };
 384
 385 int
 386 pcap_nametoeproto(const char *s)
 387 {
 388         struct eproto *p = eproto_db;
 389
 390         while (p->s != 0) {
 391                 if (strcmp(p->s, s) == 0)
 392                         return p->p;
 393                 p += 1;
 394         }
 395         return PROTO_UNDEF;
 396 }
 397
 398 #include "llc.h"
 399
 400 /* Static data base of LLC values. */
 401 static struct eproto llc_db[] = {
 402         { "iso", LLCSAP_ISONS },
 403         { "stp", LLCSAP_8021D },
 404         { "ipx", LLCSAP_IPX },
 405         { "netbeui", LLCSAP_NETBEUI },
 406         { (char *)0, 0 }
 407 };
 408
 409 int
 410 pcap_nametollc(const char *s)
 411 {
 412         struct eproto *p = llc_db;
 413
 414         while (p->s != 0) {
 415                 if (strcmp(p->s, s) == 0)
 416                         return p->p;
 417                 p += 1;
 418         }
 419         return PROTO_UNDEF;
 420 }
 421
 422 /* Hex digit to integer. */
 423 static inline int
 424 xdtoi(c)
 425         register int c;
 426 {
 427         if (isdigit(c))
 428                 return c - '0';
 429         else if (islower(c))
 430                 return c - 'a' + 10;
 431         else
 432                 return c - 'A' + 10;
 433 }
 434
 435 int
 436 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 437 {
 438         u_int n;
 439         int len;
 440
 441         *addr = 0;
 442         len = 0;
 443         while (1) {
 444                 n = 0;
 445                 while (*s && *s != '.')
 446                         n = n * 10 + *s++ - '0';
 447                 *addr <<= 8;
 448                 *addr |= n & 0xff;
 449                 len += 8;
 450                 if (*s == '\0')
 451                         return len;
 452                 ++s;
 453         }
 454         /* NOTREACHED */
 455 }
 456
 457 int
 458 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 459 {
 460 #define AREASHIFT 10
 461 #define AREAMASK 0176000
 462 #define NODEMASK 01777
 463
 464         u_int node, area;
 465
 466         if (sscanf(s, "%d.%d", &area, &node) != 2)
 467                 return(0);
 468
 469         *addr = (area << AREASHIFT) & AREAMASK;
 470         *addr |= (node & NODEMASK);
 471
 472         return(32);
 473 }
 474
 475 /*
 476  * Convert 's', which can have the one of the forms:
 477  *
 478  *      "xx:xx:xx:xx:xx:xx"
 479  *      "xx.xx.xx.xx.xx.xx"
 480  *      "xx-xx-xx-xx-xx-xx"
 481  *      "xxxx.xxxx.xxxx"
 482  *      "xxxxxxxxxxxx"
 483  *
 484  * (or various mixes of ':', '.', and '-') into a new
 485  * ethernet address.  Assumes 's' is well formed.
 486  */
 487 u_char *
 488 pcap_ether_aton(const char *s)
 489 {
 490         register u_char *ep, *e;
 491         register u_int d;
 492
 493         e = ep = (u_char *)malloc(6);
 494         if (e == NULL)
 495                 return (NULL);
 496
 497         while (*s) {
 498                 if (*s == ':' || *s == '.' || *s == '-')
 499                         s += 1;
 500                 d = xdtoi(*s++);
 501                 if (isxdigit((unsigned char)*s)) {
 502                         d <<= 4;
 503                         d |= xdtoi(*s++);
 504                 }
 505                 *ep++ = d;
 506         }
 507
 508         return (e);
 509 }
 510
 511 #ifndef HAVE_ETHER_HOSTTON
 512 /* Roll our own */
 513 u_char *
 514 pcap_ether_hostton(const char *name)
 515 {
 516         register struct pcap_etherent *ep;
 517         register u_char *ap;
 518         static FILE *fp = NULL;
 519         static int init = 0;
 520
 521         if (!init) {
 522                 ++init;
 523                 if (pcap_fopen(&fp, PCAP_ETHERS_FILE, "r") != 0)
 524                         return (NULL);
 525         } else if (fp == NULL)
 526                 return (NULL);
 527         else
 528                 rewind(fp);
 529
 530         while ((ep = pcap_next_etherent(fp)) != NULL) {
 531                 if (strcmp(ep->name, name) == 0) {
 532                         ap = (u_char *)malloc(6);
 533                         if (ap != NULL) {
 534                                 memcpy(ap, ep->addr, 6);
 535                                 return (ap);
 536                         }
 537                         break;
 538                 }
 539         }
 540         return (NULL);
 541 }
 542 #else
 543 /* Use the os supplied routines */
 544 u_char *
 545 pcap_ether_hostton(const char *name)
 546 {
 547         register u_char *ap;
 548         u_char a[6];
 549
 550         ap = NULL;
 551         if (ether_hostton(name, (struct ether_addr *)a) == 0) {
 552                 ap = (u_char *)malloc(6);
 553                 if (ap != NULL)
 554                         memcpy((char *)ap, (char *)a, 6);
 555         }
 556         return (ap);
 557 }
 558 #endif
 559
 560 int
 561 __pcap_nametodnaddr(const char *name, u_short *res)
 562 {
 563 #ifdef  DECNETLIB
 564         struct nodeent *getnodebyname();
 565         struct nodeent *nep;
 566
 567         nep = getnodebyname(name);
 568         if (nep == ((struct nodeent *)0))
 569                 return(0);
 570
 571         memcpy((char *)res, (char *)nep->n_addr, sizeof(unsigned short));
 572         return(1);
 573 #else
 574         return(0);
 575 #endif
 576 }