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
26static const char rcsid[] _U_ =
27    "@(#) $Header: /tcpdump/master/libpcap/nametoaddr.c,v 1.77.2.4 2007/06/11 09:52:05 guy Exp $ (LBL)";
28#endif
29
30#ifdef HAVE_CONFIG_H
31#include "config.h"
32#endif
33
34#ifdef WIN32
35#include <pcap-stdinc.h>
36
37#else /* WIN32 */
38
39#include <sys/param.h>
40#include <sys/types.h>				/* concession to AIX */
41#include <sys/socket.h>
42#include <sys/time.h>
43
44#include <netinet/in.h>
45#endif /* WIN32 */
46
47/*
48 * XXX - why was this included even on UNIX?
49 */
50#ifdef __MINGW32__
51#include "IP6_misc.h"
52#endif
53
54#ifndef WIN32
55#ifdef HAVE_ETHER_HOSTTON
56/*
57 * XXX - do we need any of this if <netinet/if_ether.h> doesn't declare
58 * ether_hostton()?
59 */
60#ifdef HAVE_NETINET_IF_ETHER_H
61struct mbuf;		/* Squelch compiler warnings on some platforms for */
62struct rtentry;		/* declarations in <net/if.h> */
63#include <net/if.h>	/* for "struct ifnet" in "struct arpcom" on Solaris */
64#include <netinet/if_ether.h>
65#endif /* HAVE_NETINET_IF_ETHER_H */
66#ifdef NETINET_ETHER_H_DECLARES_ETHER_HOSTTON
67#include <netinet/ether.h>
68#endif /* NETINET_ETHER_H_DECLARES_ETHER_HOSTTON */
69#endif /* HAVE_ETHER_HOSTTON */
70#include <arpa/inet.h>
71#include <netdb.h>
72#endif /* WIN32 */
73
74#include <ctype.h>
75#include <errno.h>
76#include <stdlib.h>
77#include <string.h>
78#include <stdio.h>
79
80#include "pcap-int.h"
81
82#include "gencode.h"
83#include <pcap-namedb.h>
84
85#ifdef HAVE_OS_PROTO_H
86#include "os-proto.h"
87#endif
88
89#ifndef NTOHL
90#define NTOHL(x) (x) = ntohl(x)
91#define NTOHS(x) (x) = ntohs(x)
92#endif
93
94static inline int xdtoi(int);
95
96/*
97 *  Convert host name to internet address.
98 *  Return 0 upon failure.
99 */
100bpf_u_int32 **
101pcap_nametoaddr(const char *name)
102{
103#ifndef h_addr
104	static bpf_u_int32 *hlist[2];
105#endif
106	bpf_u_int32 **p;
107	struct hostent *hp;
108
109	if ((hp = gethostbyname(name)) != NULL) {
110#ifndef h_addr
111		hlist[0] = (bpf_u_int32 *)hp->h_addr;
112		NTOHL(hp->h_addr);
113		return hlist;
114#else
115		for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
116			NTOHL(**p);
117		return (bpf_u_int32 **)hp->h_addr_list;
118#endif
119	}
120	else
121		return 0;
122}
123
124#ifdef INET6
125struct addrinfo *
126pcap_nametoaddrinfo(const char *name)
127{
128	struct addrinfo hints, *res;
129	int error;
130
131	memset(&hints, 0, sizeof(hints));
132	hints.ai_family = PF_UNSPEC;
133	hints.ai_socktype = SOCK_STREAM;	/*not really*/
134	hints.ai_protocol = IPPROTO_TCP;	/*not really*/
135	error = getaddrinfo(name, NULL, &hints, &res);
136	if (error)
137		return NULL;
138	else
139		return res;
140}
141#endif /*INET6*/
142
143/*
144 *  Convert net name to internet address.
145 *  Return 0 upon failure.
146 */
147bpf_u_int32
148pcap_nametonetaddr(const char *name)
149{
150#ifndef WIN32
151	struct netent *np;
152
153	if ((np = getnetbyname(name)) != NULL)
154		return np->n_net;
155	else
156		return 0;
157#else
158	/*
159	 * There's no "getnetbyname()" on Windows.
160	 */
161	return 0;
162#endif
163}
164
165/*
166 * Convert a port name to its port and protocol numbers.
167 * We assume only TCP or UDP.
168 * Return 0 upon failure.
169 */
170int
171pcap_nametoport(const char *name, int *port, int *proto)
172{
173	struct servent *sp;
174	int tcp_port = -1;
175	int udp_port = -1;
176
177	/*
178	 * We need to check /etc/services for ambiguous entries.
179	 * If we find the ambiguous entry, and it has the
180	 * same port number, change the proto to PROTO_UNDEF
181	 * so both TCP and UDP will be checked.
182	 */
183	sp = getservbyname(name, "tcp");
184	if (sp != NULL) tcp_port = ntohs(sp->s_port);
185	sp = getservbyname(name, "udp");
186	if (sp != NULL) udp_port = ntohs(sp->s_port);
187	if (tcp_port >= 0) {
188		*port = tcp_port;
189		*proto = IPPROTO_TCP;
190		if (udp_port >= 0) {
191			if (udp_port == tcp_port)
192				*proto = PROTO_UNDEF;
193#ifdef notdef
194			else
195				/* Can't handle ambiguous names that refer
196				   to different port numbers. */
197				warning("ambiguous port %s in /etc/services",
198					name);
199#endif
200		}
201		return 1;
202	}
203	if (udp_port >= 0) {
204		*port = udp_port;
205		*proto = IPPROTO_UDP;
206		return 1;
207	}
208#if defined(ultrix) || defined(__osf__)
209	/* Special hack in case NFS isn't in /etc/services */
210	if (strcmp(name, "nfs") == 0) {
211		*port = 2049;
212		*proto = PROTO_UNDEF;
213		return 1;
214	}
215#endif
216	return 0;
217}
218
219/*
220 * Convert a string in the form PPP-PPP, where correspond to ports, to
221 * a starting and ending port in a port range.
222 * Return 0 on failure.
223 */
224int
225pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto)
226{
227	u_int p1, p2;
228	char *off, *cpy;
229	int save_proto;
230
231	if (sscanf(name, "%d-%d", &p1, &p2) != 2) {
232		if ((cpy = strdup(name)) == NULL)
233			return 0;
234
235		if ((off = strchr(cpy, '-')) == NULL) {
236			free(cpy);
237			return 0;
238		}
239
240		*off = '\0';
241
242		if (pcap_nametoport(cpy, port1, proto) == 0) {
243			free(cpy);
244			return 0;
245		}
246		save_proto = *proto;
247
248		if (pcap_nametoport(off + 1, port2, proto) == 0) {
249			free(cpy);
250			return 0;
251		}
252
253		if (*proto != save_proto)
254			*proto = PROTO_UNDEF;
255	} else {
256		*port1 = p1;
257		*port2 = p2;
258		*proto = PROTO_UNDEF;
259	}
260
261	return 1;
262}
263
264int
265pcap_nametoproto(const char *str)
266{
267	struct protoent *p;
268
269	p = getprotobyname(str);
270	if (p != 0)
271		return p->p_proto;
272	else
273		return PROTO_UNDEF;
274}
275
276#include "ethertype.h"
277
278struct eproto {
279	const char *s;
280	u_short p;
281};
282
283/* Static data base of ether protocol types. */
284struct eproto eproto_db[] = {
285	{ "pup", ETHERTYPE_PUP },
286	{ "xns", ETHERTYPE_NS },
287	{ "ip", ETHERTYPE_IP },
288#ifdef INET6
289	{ "ip6", ETHERTYPE_IPV6 },
290#endif
291	{ "arp", ETHERTYPE_ARP },
292	{ "rarp", ETHERTYPE_REVARP },
293	{ "sprite", ETHERTYPE_SPRITE },
294	{ "mopdl", ETHERTYPE_MOPDL },
295	{ "moprc", ETHERTYPE_MOPRC },
296	{ "decnet", ETHERTYPE_DN },
297	{ "lat", ETHERTYPE_LAT },
298	{ "sca", ETHERTYPE_SCA },
299	{ "lanbridge", ETHERTYPE_LANBRIDGE },
300	{ "vexp", ETHERTYPE_VEXP },
301	{ "vprod", ETHERTYPE_VPROD },
302	{ "atalk", ETHERTYPE_ATALK },
303	{ "atalkarp", ETHERTYPE_AARP },
304	{ "loopback", ETHERTYPE_LOOPBACK },
305	{ "decdts", ETHERTYPE_DECDTS },
306	{ "decdns", ETHERTYPE_DECDNS },
307	{ (char *)0, 0 }
308};
309
310int
311pcap_nametoeproto(const char *s)
312{
313	struct eproto *p = eproto_db;
314
315	while (p->s != 0) {
316		if (strcmp(p->s, s) == 0)
317			return p->p;
318		p += 1;
319	}
320	return PROTO_UNDEF;
321}
322
323#include "llc.h"
324
325/* Static data base of LLC values. */
326static struct eproto llc_db[] = {
327	{ "iso", LLCSAP_ISONS },
328	{ "stp", LLCSAP_8021D },
329	{ "ipx", LLCSAP_IPX },
330	{ "netbeui", LLCSAP_NETBEUI },
331	{ (char *)0, 0 }
332};
333
334int
335pcap_nametollc(const char *s)
336{
337	struct eproto *p = llc_db;
338
339	while (p->s != 0) {
340		if (strcmp(p->s, s) == 0)
341			return p->p;
342		p += 1;
343	}
344	return PROTO_UNDEF;
345}
346
347/* Hex digit to integer. */
348static inline int
349xdtoi(c)
350	register int c;
351{
352	if (isdigit(c))
353		return c - '0';
354	else if (islower(c))
355		return c - 'a' + 10;
356	else
357		return c - 'A' + 10;
358}
359
360int
361__pcap_atoin(const char *s, bpf_u_int32 *addr)
362{
363	u_int n;
364	int len;
365
366	*addr = 0;
367	len = 0;
368	while (1) {
369		n = 0;
370		while (*s && *s != '.')
371			n = n * 10 + *s++ - '0';
372		*addr <<= 8;
373		*addr |= n & 0xff;
374		len += 8;
375		if (*s == '\0')
376			return len;
377		++s;
378	}
379	/* NOTREACHED */
380}
381
382int
383__pcap_atodn(const char *s, bpf_u_int32 *addr)
384{
385#define AREASHIFT 10
386#define AREAMASK 0176000
387#define NODEMASK 01777
388
389	u_int node, area;
390
391	if (sscanf(s, "%d.%d", &area, &node) != 2)
392		bpf_error("malformed decnet address '%s'", s);
393
394	*addr = (area << AREASHIFT) & AREAMASK;
395	*addr |= (node & NODEMASK);
396
397	return(32);
398}
399
400/*
401 * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new
402 * ethernet address.  Assumes 's' is well formed.
403 */
404u_char *
405pcap_ether_aton(const char *s)
406{
407	register u_char *ep, *e;
408	register u_int d;
409
410	e = ep = (u_char *)malloc(6);
411
412	while (*s) {
413		if (*s == ':')
414			s += 1;
415		d = xdtoi(*s++);
416		if (isxdigit((unsigned char)*s)) {
417			d <<= 4;
418			d |= xdtoi(*s++);
419		}
420		*ep++ = d;
421	}
422
423	return (e);
424}
425
426#ifndef HAVE_ETHER_HOSTTON
427/* Roll our own */
428u_char *
429pcap_ether_hostton(const char *name)
430{
431	register struct pcap_etherent *ep;
432	register u_char *ap;
433	static FILE *fp = NULL;
434	static int init = 0;
435
436	if (!init) {
437		fp = fopen(PCAP_ETHERS_FILE, "r");
438		++init;
439		if (fp == NULL)
440			return (NULL);
441	} else if (fp == NULL)
442		return (NULL);
443	else
444		rewind(fp);
445
446	while ((ep = pcap_next_etherent(fp)) != NULL) {
447		if (strcmp(ep->name, name) == 0) {
448			ap = (u_char *)malloc(6);
449			if (ap != NULL) {
450				memcpy(ap, ep->addr, 6);
451				return (ap);
452			}
453			break;
454		}
455	}
456	return (NULL);
457}
458#else
459
460#if !defined(HAVE_DECL_ETHER_HOSTTON) || !HAVE_DECL_ETHER_HOSTTON
461#ifndef HAVE_STRUCT_ETHER_ADDR
462struct ether_addr {
463	unsigned char ether_addr_octet[6];
464};
465#endif
466extern int ether_hostton(const char *, struct ether_addr *);
467#endif
468
469/* Use the os supplied routines */
470u_char *
471pcap_ether_hostton(const char *name)
472{
473	register u_char *ap;
474	u_char a[6];
475
476	ap = NULL;
477	if (ether_hostton(name, (struct ether_addr *)a) == 0) {
478		ap = (u_char *)malloc(6);
479		if (ap != NULL)
480			memcpy((char *)ap, (char *)a, 6);
481	}
482	return (ap);
483}
484#endif
485
486u_short
487__pcap_nametodnaddr(const char *name)
488{
489#ifdef	DECNETLIB
490	struct nodeent *getnodebyname();
491	struct nodeent *nep;
492	unsigned short res;
493
494	nep = getnodebyname(name);
495	if (nep == ((struct nodeent *)0))
496		bpf_error("unknown decnet host name '%s'\n", name);
497
498	memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
499	return(res);
500#else
501	bpf_error("decnet name support not included, '%s' cannot be translated\n",
502		name);
503	return(0);
504#endif
505}
506