xref: /freebsd/lib/libc/net/gethostbynis.c (revision 74bf4e164ba5851606a27d4feff27717452583e5)
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 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28 
29 #include <sys/param.h>
30 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
33 #include <arpa/nameser.h>
34 #include <netdb.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <ctype.h>
38 #include <errno.h>
39 #include <string.h>
40 #include <stdarg.h>
41 #include <nsswitch.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
52 static char *host_aliases[MAXALIASES];
53 static char hostaddr[MAXADDRS];
54 static char *host_addrs[2];
55 
56 static struct hostent *
57 _gethostbynis(name, map, af)
58 	const char *name;
59 	char *map;
60 	int af;
61 {
62 	char *cp, **q;
63 	char *result;
64 	int resultlen,size;
65 	static struct hostent h;
66 	static char *domain = (char *)NULL;
67 	static char ypbuf[YPMAXRECORD + 2];
68 	in_addr_t addr;
69 
70 	switch(af) {
71 	case AF_INET:
72 		size = NS_INADDRSZ;
73 		break;
74 	default:
75 	case AF_INET6:
76 		size = NS_IN6ADDRSZ;
77 		errno = EAFNOSUPPORT;
78 		h_errno = NETDB_INTERNAL;
79 		return NULL;
80 	}
81 
82 	if (domain == (char *)NULL)
83 		if (yp_get_default_domain (&domain)) {
84 			h_errno = NETDB_INTERNAL;
85 			return ((struct hostent *)NULL);
86 		}
87 
88 	if (yp_match(domain, map, name, strlen(name), &result, &resultlen)) {
89 		h_errno = HOST_NOT_FOUND;
90 		return ((struct hostent *)NULL);
91 	}
92 
93 	/* avoid potential memory leak */
94 	bcopy((char *)result, (char *)&ypbuf, resultlen);
95 	ypbuf[resultlen] = '\0';
96 	free(result);
97 	result = (char *)&ypbuf;
98 
99 	if ((cp = index(result, '\n')))
100 		*cp = '\0';
101 
102 	cp = strpbrk(result, " \t");
103 	*cp++ = '\0';
104 	h.h_addr_list = host_addrs;
105 	h.h_addr = hostaddr;
106 	addr = inet_addr(result);
107 	bcopy((char *)&addr, h.h_addr, size);
108 	h.h_length = size;
109 	h.h_addrtype = AF_INET;
110 	while (*cp == ' ' || *cp == '\t')
111 		cp++;
112 	h.h_name = cp;
113 	q = h.h_aliases = host_aliases;
114 	cp = strpbrk(cp, " \t");
115 	if (cp != NULL)
116 		*cp++ = '\0';
117 	while (cp && *cp) {
118 		if (*cp == ' ' || *cp == '\t') {
119 			cp++;
120 			continue;
121 		}
122 		if (q < &host_aliases[MAXALIASES - 1])
123 			*q++ = cp;
124 		cp = strpbrk(cp, " \t");
125 		if (cp != NULL)
126 			*cp++ = '\0';
127 	}
128 	*q = NULL;
129 	return (&h);
130 }
131 #endif /* YP */
132 
133 /* XXX _gethostbynisname/_gethostbynisaddr only used by getaddrinfo */
134 struct hostent *
135 _gethostbynisname(const char *name, int af)
136 {
137 #ifdef YP
138 	return _gethostbynis(name, "hosts.byname", af);
139 #else
140 	return NULL;
141 #endif
142 }
143 
144 struct hostent *
145 _gethostbynisaddr(const char *addr, int len, int af)
146 {
147 #ifdef YP
148 	return _gethostbynis(inet_ntoa(*(struct in_addr *)addr),
149 			     "hosts.byaddr", af);
150 #else
151 	return NULL;
152 #endif
153 }
154 
155 
156 int
157 _nis_gethostbyname(void *rval, void *cb_data, va_list ap)
158 {
159 #ifdef YP
160 	const char *name;
161 	int af;
162 
163 	name = va_arg(ap, const char *);
164 	af = va_arg(ap, int);
165 
166 	*(struct hostent **)rval = _gethostbynis(name, "hosts.byname", af);
167 	return (*(struct hostent **)rval != NULL) ? NS_SUCCESS : NS_NOTFOUND;
168 #else
169 	return NS_UNAVAIL;
170 #endif
171 }
172 
173 int
174 _nis_gethostbyaddr(void *rval, void *cb_data, va_list ap)
175 {
176 #ifdef YP
177 	const char *addr;
178 	int len;
179 	int af;
180 
181 	addr = va_arg(ap, const char *);
182 	len = va_arg(ap, int);
183 	af = va_arg(ap, int);
184 
185 	*(struct hostent **)rval =_gethostbynis(inet_ntoa(*(struct in_addr *)addr),"hosts.byaddr", af);
186 	return (*(struct hostent **)rval != NULL) ? NS_SUCCESS : NS_NOTFOUND;
187 #else
188 	return NS_UNAVAIL;
189 #endif
190 }
191