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 #ifndef lint
  26 static const char rcsid[] =
  27     "@(#) $Header: /tcpdump/master/libpcap/nametoaddr.c,v 1.63 2002-04-09 07:41:19 guy Exp $ (LBL)";
  28 #endif
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include <sys/param.h>
  35 #include <sys/types.h>                          /* concession to AIX */
  36 #include <sys/socket.h>
  37 #include <sys/time.h>
  38
  39 #include <netinet/in.h>
  40 #ifdef HAVE_ETHER_HOSTTON
  41 #ifdef HAVE_NETINET_IF_ETHER_H
  42 struct mbuf;            /* Squelch compiler warnings on some platforms for */
  43 struct rtentry;         /* declarations in <net/if.h> */
  44 #include <net/if.h>     /* for "struct ifnet" in "struct arpcom" on Solaris */
  45 #include <netinet/if_ether.h>
  46 #endif /* HAVE_NETINET_IF_ETHER_H */
  47 #endif /* HAVE_ETHER_HOSTTON */
  48 #include <arpa/inet.h>
  49 #include <netdb.h>
  50
  51 #include <ctype.h>
  52 #include <errno.h>
  53 #include <stdlib.h>
  54 #include <memory.h>
  55 #include <stdio.h>
  56
  57 #include "pcap-int.h"
  58
  59 #include "gencode.h"
  60 #include <pcap-namedb.h>
  61
  62 #ifdef HAVE_OS_PROTO_H
  63 #include "os-proto.h"
  64 #endif
  65
  66 #ifndef NTOHL
  67 #define NTOHL(x) (x) = ntohl(x)
  68 #define NTOHS(x) (x) = ntohs(x)
  69 #endif
  70
  71 static inline int xdtoi(int);
  72
  73 /*
  74  *  Convert host name to internet address.
  75  *  Return 0 upon failure.
  76  */
  77 bpf_u_int32 **
  78 pcap_nametoaddr(const char *name)
  79 {
  80 #ifndef h_addr
  81         static bpf_u_int32 *hlist[2];
  82 #endif
  83         bpf_u_int32 **p;
  84         struct hostent *hp;
  85
  86         if ((hp = gethostbyname(name)) != NULL) {
  87 #ifndef h_addr
  88                 hlist[0] = (bpf_u_int32 *)hp->h_addr;
  89                 NTOHL(hp->h_addr);
  90                 return hlist;
  91 #else
  92                 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
  93                         NTOHL(**p);
  94                 return (bpf_u_int32 **)hp->h_addr_list;
  95 #endif
  96         }
  97         else
  98                 return 0;
  99 }
 100
 101 #ifdef INET6
 102 struct addrinfo *
 103 pcap_nametoaddrinfo(const char *name)
 104 {
 105         struct addrinfo hints, *res;
 106         int error;
 107
 108         memset(&hints, 0, sizeof(hints));
 109         hints.ai_family = PF_UNSPEC;
 110         hints.ai_socktype = SOCK_STREAM;        /*not really*/
 111         error = getaddrinfo(name, NULL, &hints, &res);
 112         if (error)
 113                 return NULL;
 114         else
 115                 return res;
 116 }
 117 #endif /*INET6*/
 118
 119 /*
 120  *  Convert net name to internet address.
 121  *  Return 0 upon failure.
 122  */
 123 bpf_u_int32
 124 pcap_nametonetaddr(const char *name)
 125 {
 126         struct netent *np;
 127
 128         if ((np = getnetbyname(name)) != NULL)
 129                 return np->n_net;
 130         else
 131                 return 0;
 132 }
 133
 134 /*
 135  * Convert a port name to its port and protocol numbers.
 136  * We assume only TCP or UDP.
 137  * Return 0 upon failure.
 138  */
 139 int
 140 pcap_nametoport(const char *name, int *port, int *proto)
 141 {
 142         struct servent *sp;
 143         char *other;
 144
 145         sp = getservbyname(name, (char *)0);
 146         if (sp != NULL) {
 147                 NTOHS(sp->s_port);
 148                 *port = sp->s_port;
 149                 *proto = pcap_nametoproto(sp->s_proto);
 150                 /*
 151                  * We need to check /etc/services for ambiguous entries.
 152                  * If we find the ambiguous entry, and it has the
 153                  * same port number, change the proto to PROTO_UNDEF
 154                  * so both TCP and UDP will be checked.
 155                  */
 156                 if (*proto == IPPROTO_TCP)
 157                         other = "udp";
 158                 else
 159                         other = "tcp";
 160
 161                 sp = getservbyname(name, other);
 162                 if (sp != 0) {
 163                         NTOHS(sp->s_port);
 164 #ifdef notdef
 165                         if (*port != sp->s_port)
 166                                 /* Can't handle ambiguous names that refer
 167                                    to different port numbers. */
 168                                 warning("ambiguous port %s in /etc/services",
 169                                         name);
 170 #endif
 171                         *proto = PROTO_UNDEF;
 172                 }
 173                 return 1;
 174         }
 175 #if defined(ultrix) || defined(__osf__)
 176         /* Special hack in case NFS isn't in /etc/services */
 177         if (strcmp(name, "nfs") == 0) {
 178                 *port = 2049;
 179                 *proto = PROTO_UNDEF;
 180                 return 1;
 181         }
 182 #endif
 183         return 0;
 184 }
 185
 186 int
 187 pcap_nametoproto(const char *str)
 188 {
 189         struct protoent *p;
 190
 191         p = getprotobyname(str);
 192         if (p != 0)
 193                 return p->p_proto;
 194         else
 195                 return PROTO_UNDEF;
 196 }
 197
 198 #include "ethertype.h"
 199
 200 struct eproto {
 201         char *s;
 202         u_short p;
 203 };
 204
 205 /* Static data base of ether protocol types. */
 206 struct eproto eproto_db[] = {
 207         { "pup", ETHERTYPE_PUP },
 208         { "xns", ETHERTYPE_NS },
 209         { "ip", ETHERTYPE_IP },
 210 #ifdef INET6
 211         { "ip6", ETHERTYPE_IPV6 },
 212 #endif
 213         { "arp", ETHERTYPE_ARP },
 214         { "rarp", ETHERTYPE_REVARP },
 215         { "sprite", ETHERTYPE_SPRITE },
 216         { "mopdl", ETHERTYPE_MOPDL },
 217         { "moprc", ETHERTYPE_MOPRC },
 218         { "decnet", ETHERTYPE_DN },
 219         { "lat", ETHERTYPE_LAT },
 220         { "sca", ETHERTYPE_SCA },
 221         { "lanbridge", ETHERTYPE_LANBRIDGE },
 222         { "vexp", ETHERTYPE_VEXP },
 223         { "vprod", ETHERTYPE_VPROD },
 224         { "atalk", ETHERTYPE_ATALK },
 225         { "atalkarp", ETHERTYPE_AARP },
 226         { "loopback", ETHERTYPE_LOOPBACK },
 227         { "decdts", ETHERTYPE_DECDTS },
 228         { "decdns", ETHERTYPE_DECDNS },
 229         { (char *)0, 0 }
 230 };
 231
 232 int
 233 pcap_nametoeproto(const char *s)
 234 {
 235         struct eproto *p = eproto_db;
 236
 237         while (p->s != 0) {
 238                 if (strcmp(p->s, s) == 0)
 239                         return p->p;
 240                 p += 1;
 241         }
 242         return PROTO_UNDEF;
 243 }
 244
 245 /* Hex digit to integer. */
 246 static inline int
 247 xdtoi(c)
 248         register int c;
 249 {
 250         if (isdigit(c))
 251                 return c - '0';
 252         else if (islower(c))
 253                 return c - 'a' + 10;
 254         else
 255                 return c - 'A' + 10;
 256 }
 257
 258 int
 259 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 260 {
 261         u_int n;
 262         int len;
 263
 264         *addr = 0;
 265         len = 0;
 266         while (1) {
 267                 n = 0;
 268                 while (*s && *s != '.')
 269                         n = n * 10 + *s++ - '0';
 270                 *addr <<= 8;
 271                 *addr |= n & 0xff;
 272                 len += 8;
 273                 if (*s == '\0')
 274                         return len;
 275                 ++s;
 276         }
 277         /* NOTREACHED */
 278 }
 279
 280 int
 281 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 282 {
 283 #define AREASHIFT 10
 284 #define AREAMASK 0176000
 285 #define NODEMASK 01777
 286
 287         u_int node, area;
 288
 289         if (sscanf((char *)s, "%d.%d", &area, &node) != 2)
 290                 bpf_error("malformed decnet address '%s'", s);
 291
 292         *addr = (area << AREASHIFT) & AREAMASK;
 293         *addr |= (node & NODEMASK);
 294
 295         return(32);
 296 }
 297
 298 /*
 299  * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new
 300  * ethernet address.  Assumes 's' is well formed.
 301  */
 302 u_char *
 303 pcap_ether_aton(const char *s)
 304 {
 305         register u_char *ep, *e;
 306         register u_int d;
 307
 308         e = ep = (u_char *)malloc(6);
 309
 310         while (*s) {
 311                 if (*s == ':')
 312                         s += 1;
 313                 d = xdtoi(*s++);
 314                 if (isxdigit((unsigned char)*s)) {
 315                         d <<= 4;
 316                         d |= xdtoi(*s++);
 317                 }
 318                 *ep++ = d;
 319         }
 320
 321         return (e);
 322 }
 323
 324 #ifndef HAVE_ETHER_HOSTTON
 325 /* Roll our own */
 326 u_char *
 327 pcap_ether_hostton(const char *name)
 328 {
 329         register struct pcap_etherent *ep;
 330         register u_char *ap;
 331         static FILE *fp = NULL;
 332         static int init = 0;
 333
 334         if (!init) {
 335                 fp = fopen(PCAP_ETHERS_FILE, "r");
 336                 ++init;
 337                 if (fp == NULL)
 338                         return (NULL);
 339         } else if (fp == NULL)
 340                 return (NULL);
 341         else
 342                 rewind(fp);
 343
 344         while ((ep = pcap_next_etherent(fp)) != NULL) {
 345                 if (strcmp(ep->name, name) == 0) {
 346                         ap = (u_char *)malloc(6);
 347                         if (ap != NULL) {
 348                                 memcpy(ap, ep->addr, 6);
 349                                 return (ap);
 350                         }
 351                         break;
 352                 }
 353         }
 354         return (NULL);
 355 }
 356 #else
 357
 358 /*
 359  * XXX - perhaps this should, instead, be declared in "lbl/os-XXX.h" files,
 360  * for those OS versions that don't declare it, rather than being declared
 361  * here?  That way, for example, we could declare it on FreeBSD 2.x (which
 362  * doesn't declare it), but not on FreeBSD 3.x (which declares it like
 363  * this) or FreeBSD 4.x (which declares it with its first argument as
 364  * "const char *", so no matter how we declare it here, it'll fail to
 365  * compile on one of 3.x or 4.x).
 366  */
 367 #if !defined(sgi) && !defined(__NetBSD__) && !defined(__FreeBSD__)
 368 extern int ether_hostton(char *, struct ether_addr *);
 369 #endif
 370
 371 /* Use the os supplied routines */
 372 u_char *
 373 pcap_ether_hostton(const char *name)
 374 {
 375         register u_char *ap;
 376         u_char a[6];
 377
 378         ap = NULL;
 379         if (ether_hostton((char *)name, (struct ether_addr *)a) == 0) {
 380                 ap = (u_char *)malloc(6);
 381                 if (ap != NULL)
 382                         memcpy((char *)ap, (char *)a, 6);
 383         }
 384         return (ap);
 385 }
 386 #endif
 387
 388 u_short
 389 __pcap_nametodnaddr(const char *name)
 390 {
 391 #ifdef  DECNETLIB
 392         struct nodeent *getnodebyname();
 393         struct nodeent *nep;
 394         unsigned short res;
 395
 396         nep = getnodebyname(name);
 397         if (nep == ((struct nodeent *)0))
 398                 bpf_error("unknown decnet host name '%s'\n", name);
 399
 400         memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
 401         return(res);
 402 #else
 403         bpf_error("decnet name support not included, '%s' cannot be translated\n",
 404                 name);
 405         return(0);
 406 #endif
 407 }