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: nametoaddr.c,v 1.48 98/07/12 13:15:36 leres 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 <net/ethernet.h> 42 #include <netinet/in.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 } 373