gethostbynis.c revision 43171 
1/*-
2 * Copyright (c) 1994, Garrett Wollman
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26#if defined(LIBC_SCCS) && !defined(lint)
27static char sccsid[] = "@(#)$Id: gethostbynis.c,v 1.8 1997/02/22 15:00:08 peter Exp $";
28static char rcsid[] = "$Id: gethostbynis.c,v 1.8 1997/02/22 15:00:08 peter Exp $";
29#endif /* LIBC_SCCS and not lint */
30
31#include <sys/param.h>
32#include <sys/socket.h>
33#include <netinet/in.h>
34#include <arpa/inet.h>
35#include <arpa/nameser.h>
36#include <netdb.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <ctype.h>
40#include <errno.h>
41#include <string.h>
42#ifdef YP
43#include <rpc/rpc.h>
44#include <rpcsvc/yp_prot.h>
45#include <rpcsvc/ypclnt.h>
46#endif
47
48#define	MAXALIASES	35
49#define	MAXADDRS	35
50
51#ifdef YP
52static char *host_aliases[MAXALIASES];
53static char hostaddr[MAXADDRS];
54static char *host_addrs[2];
55#endif /* YP */
56
57static struct hostent *
58_gethostbynis(name, map, af)
59	const char *name;
60	char *map;
61	int af;
62{
63#ifdef YP
64	register char *cp, **q;
65	char *result;
66	int resultlen,size;
67	static struct hostent h;
68	static char *domain = (char *)NULL;
69	static char ypbuf[YPMAXRECORD + 2];
70
71	switch(af) {
72	case AF_INET:
73		size = NS_INADDRSZ;
74		break;
75	default:
76	case AF_INET6:
77		size = NS_IN6ADDRSZ;
78		errno = EAFNOSUPPORT;
79		return NULL;
80	}
81
82	if (domain == (char *)NULL)
83		if (yp_get_default_domain (&domain))
84			return ((struct hostent *)NULL);
85
86	if (yp_match(domain, map, name, strlen(name), &result, &resultlen))
87		return ((struct hostent *)NULL);
88
89	/* avoid potential memory leak */
90	bcopy((char *)result, (char *)&ypbuf, resultlen);
91	ypbuf[resultlen] = '\0';
92	free(result);
93	result = (char *)&ypbuf;
94
95	if ((cp = index(result, '\n')))
96		*cp = '\0';
97
98	cp = strpbrk(result, " \t");
99	*cp++ = '\0';
100	h.h_addr_list = host_addrs;
101	h.h_addr = hostaddr;
102	*((u_long *)h.h_addr) = inet_addr(result);
103	h.h_length = size;
104	h.h_addrtype = AF_INET;
105	while (*cp == ' ' || *cp == '\t')
106		cp++;
107	h.h_name = cp;
108	q = h.h_aliases = host_aliases;
109	cp = strpbrk(cp, " \t");
110	if (cp != NULL)
111		*cp++ = '\0';
112	while (cp && *cp) {
113		if (*cp == ' ' || *cp == '\t') {
114			cp++;
115			continue;
116		}
117		if (q < &host_aliases[MAXALIASES - 1])
118			*q++ = cp;
119		cp = strpbrk(cp, " \t");
120		if (cp != NULL)
121			*cp++ = '\0';
122	}
123	*q = NULL;
124	return (&h);
125#else
126	return (NULL);
127#endif /* YP */
128}
129
130struct hostent *
131_gethostbynisname(name, af)
132	const char *name;
133	int af;
134{
135	return _gethostbynis(name, "hosts.byname", af);
136}
137
138struct hostent *
139_gethostbynisaddr(addr, len, af)
140	const char *addr;
141	int len;
142	int af;
143{
144	return _gethostbynis(inet_ntoa(*(struct in_addr *)addr),"hosts.byaddr", af);
145}
146