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 1.48 1999-10-07 23:46:40 mcr Exp $ (LBL)";
  28 #endif
  29
  30 #include <sys/param.h>
  31 #include <sys/types.h>                          /* concession to AIX */
  32 #include <sys/socket.h>
  33 #include <sys/time.h>
  34
  35 #if __STDC__
  36 struct mbuf;
  37 struct rtentry;
  38 #endif
  39
  40 #include <net/if.h>
  41 #include <netinet/in.h>
  42 #include <netinet/if_ether.h>
  43 #include <arpa/inet.h>
  44
  45 #include <ctype.h>
  46 #include <errno.h>
  47 #include <stdlib.h>
  48 #include <memory.h>
  49 #include <netdb.h>
  50 #include <stdio.h>
  51
  52 #include "pcap-int.h"
  53
  54 #include "gencode.h"
  55 #include <pcap-namedb.h>
  56
  57 #include "gnuc.h"
  58 #ifdef HAVE_OS_PROTO_H
  59 #include "os-proto.h"
  60 #endif
  61
  62 #ifndef NTOHL
  63 #define NTOHL(x) (x) = ntohl(x)
  64 #define NTOHS(x) (x) = ntohs(x)
  65 #endif
  66
  67 static inline int xdtoi(int);
  68
  69 /*
  70  *  Convert host name to internet address.
  71  *  Return 0 upon failure.
  72  */
  73 bpf_u_int32 **
  74 pcap_nametoaddr(const char *name)
  75 {
  76 #ifndef h_addr
  77         static bpf_u_int32 *hlist[2];
  78 #endif
  79         bpf_u_int32 **p;
  80         struct hostent *hp;
  81
  82         if ((hp = gethostbyname(name)) != NULL) {
  83 #ifndef h_addr
  84                 hlist[0] = (bpf_u_int32 *)hp->h_addr;
  85                 NTOHL(hp->h_addr);
  86                 return hlist;
  87 #else
  88                 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
  89                         NTOHL(**p);
  90                 return (bpf_u_int32 **)hp->h_addr_list;
  91 #endif
  92         }
  93         else
  94                 return 0;
  95 }
  96
  97 /*
  98  *  Convert net name to internet address.
  99  *  Return 0 upon failure.
 100  */
 101 bpf_u_int32
 102 pcap_nametonetaddr(const char *name)
 103 {
 104         struct netent *np;
 105
 106         if ((np = getnetbyname(name)) != NULL)
 107                 return np->n_net;
 108         else
 109                 return 0;
 110 }
 111
 112 /*
 113  * Convert a port name to its port and protocol numbers.
 114  * We assume only TCP or UDP.
 115  * Return 0 upon failure.
 116  */
 117 int
 118 pcap_nametoport(const char *name, int *port, int *proto)
 119 {
 120         struct servent *sp;
 121         char *other;
 122
 123         sp = getservbyname(name, (char *)0);
 124         if (sp != NULL) {
 125                 NTOHS(sp->s_port);
 126                 *port = sp->s_port;
 127                 *proto = pcap_nametoproto(sp->s_proto);
 128                 /*
 129                  * We need to check /etc/services for ambiguous entries.
 130                  * If we find the ambiguous entry, and it has the
 131                  * same port number, change the proto to PROTO_UNDEF
 132                  * so both TCP and UDP will be checked.
 133                  */
 134                 if (*proto == IPPROTO_TCP)
 135                         other = "udp";
 136                 else
 137                         other = "tcp";
 138
 139                 sp = getservbyname(name, other);
 140                 if (sp != 0) {
 141                         NTOHS(sp->s_port);
 142 #ifdef notdef
 143                         if (*port != sp->s_port)
 144                                 /* Can't handle ambiguous names that refer
 145                                    to different port numbers. */
 146                                 warning("ambiguous port %s in /etc/services",
 147                                         name);
 148 #endif
 149                         *proto = PROTO_UNDEF;
 150                 }
 151                 return 1;
 152         }
 153 #if defined(ultrix) || defined(__osf__)
 154         /* Special hack in case NFS isn't in /etc/services */
 155         if (strcmp(name, "nfs") == 0) {
 156                 *port = 2049;
 157                 *proto = PROTO_UNDEF;
 158                 return 1;
 159         }
 160 #endif
 161         return 0;
 162 }
 163
 164 int
 165 pcap_nametoproto(const char *str)
 166 {
 167         struct protoent *p;
 168
 169         p = getprotobyname(str);
 170         if (p != 0)
 171                 return p->p_proto;
 172         else
 173                 return PROTO_UNDEF;
 174 }
 175
 176 #include "ethertype.h"
 177
 178 struct eproto {
 179         char *s;
 180         u_short p;
 181 };
 182
 183 /* Static data base of ether protocol types. */
 184 struct eproto eproto_db[] = {
 185         { "pup", ETHERTYPE_PUP },
 186         { "xns", ETHERTYPE_NS },
 187         { "ip", ETHERTYPE_IP },
 188         { "arp", ETHERTYPE_ARP },
 189         { "rarp", ETHERTYPE_REVARP },
 190         { "sprite", ETHERTYPE_SPRITE },
 191         { "mopdl", ETHERTYPE_MOPDL },
 192         { "moprc", ETHERTYPE_MOPRC },
 193         { "decnet", ETHERTYPE_DN },
 194         { "lat", ETHERTYPE_LAT },
 195         { "sca", ETHERTYPE_SCA },
 196         { "lanbridge", ETHERTYPE_LANBRIDGE },
 197         { "vexp", ETHERTYPE_VEXP },
 198         { "vprod", ETHERTYPE_VPROD },
 199         { "atalk", ETHERTYPE_ATALK },
 200         { "atalkarp", ETHERTYPE_AARP },
 201         { "loopback", ETHERTYPE_LOOPBACK },
 202         { "decdts", ETHERTYPE_DECDTS },
 203         { "decdns", ETHERTYPE_DECDNS },
 204         { (char *)0, 0 }
 205 };
 206
 207 int
 208 pcap_nametoeproto(const char *s)
 209 {
 210         struct eproto *p = eproto_db;
 211
 212         while (p->s != 0) {
 213                 if (strcmp(p->s, s) == 0)
 214                         return p->p;
 215                 p += 1;
 216         }
 217         return PROTO_UNDEF;
 218 }
 219
 220 /* Hex digit to integer. */
 221 static inline int
 222 xdtoi(c)
 223         register int c;
 224 {
 225         if (isdigit(c))
 226                 return c - '0';
 227         else if (islower(c))
 228                 return c - 'a' + 10;
 229         else
 230                 return c - 'A' + 10;
 231 }
 232
 233 int
 234 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 235 {
 236         u_int n;
 237         int len;
 238
 239         *addr = 0;
 240         len = 0;
 241         while (1) {
 242                 n = 0;
 243                 while (*s && *s != '.')
 244                         n = n * 10 + *s++ - '0';
 245                 *addr <<= 8;
 246                 *addr |= n & 0xff;
 247                 len += 8;
 248                 if (*s == '\0')
 249                         return len;
 250                 ++s;
 251         }
 252         /* NOTREACHED */
 253 }
 254
 255 int
 256 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 257 {
 258 #define AREASHIFT 10
 259 #define AREAMASK 0176000
 260 #define NODEMASK 01777
 261
 262         u_int node, area;
 263
 264         if (sscanf((char *)s, "%d.%d", &area, &node) != 2)
 265                 bpf_error("malformed decnet address '%s'", s);
 266
 267         *addr = (area << AREASHIFT) & AREAMASK;
 268         *addr |= (node & NODEMASK);
 269
 270         return(32);
 271 }
 272
 273 /*
 274  * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new
 275  * ethernet address.  Assumes 's' is well formed.
 276  */
 277 u_char *
 278 pcap_ether_aton(const char *s)
 279 {
 280         register u_char *ep, *e;
 281         register u_int d;
 282
 283         e = ep = (u_char *)malloc(6);
 284
 285         while (*s) {
 286                 if (*s == ':')
 287                         s += 1;
 288                 d = xdtoi(*s++);
 289                 if (isxdigit(*s)) {
 290                         d <<= 4;
 291                         d |= xdtoi(*s++);
 292                 }
 293                 *ep++ = d;
 294         }
 295
 296         return (e);
 297 }
 298
 299 #ifndef HAVE_ETHER_HOSTTON
 300 /* Roll our own */
 301 u_char *
 302 pcap_ether_hostton(const char *name)
 303 {
 304         register struct pcap_etherent *ep;
 305         register u_char *ap;
 306         static FILE *fp = NULL;
 307         static init = 0;
 308
 309         if (!init) {
 310                 fp = fopen(PCAP_ETHERS_FILE, "r");
 311                 ++init;
 312                 if (fp == NULL)
 313                         return (NULL);
 314         } else if (fp == NULL)
 315                 return (NULL);
 316         else
 317                 rewind(fp);
 318
 319         while ((ep = pcap_next_etherent(fp)) != NULL) {
 320                 if (strcmp(ep->name, name) == 0) {
 321                         ap = (u_char *)malloc(6);
 322                         if (ap != NULL) {
 323                                 memcpy(ap, ep->addr, 6);
 324                                 return (ap);
 325                         }
 326                         break;
 327                 }
 328         }
 329         return (NULL);
 330 }
 331 #else
 332
 333 #ifndef sgi
 334 extern int ether_hostton(char *, struct ether_addr *);
 335 #endif
 336
 337 /* Use the os supplied routines */
 338 u_char *
 339 pcap_ether_hostton(const char *name)
 340 {
 341         register u_char *ap;
 342         u_char a[6];
 343
 344         ap = NULL;
 345         if (ether_hostton((char *)name, (struct ether_addr *)a) == 0) {
 346                 ap = (u_char *)malloc(6);
 347                 if (ap != NULL)
 348                         memcpy((char *)ap, (char *)a, 6);
 349         }
 350         return (ap);
 351 }
 352 #endif
 353
 354 u_short
 355 __pcap_nametodnaddr(const char *name)
 356 {
 357 #ifdef  DECNETLIB
 358         struct nodeent *getnodebyname();
 359         struct nodeent *nep;
 360         unsigned short res;
 361
 362         nep = getnodebyname(name);
 363         if (nep == ((struct nodeent *)0))
 364                 bpf_error("unknown decnet host name '%s'\n", name);
 365
 366         memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
 367         return(res);
 368 #else
 369         bpf_error("decnet name support not included, '%s' cannot be translated\n",
 370                 name);
 371 #endif
 372 }