getnetbynis.c revision 145684 
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: head/lib/libc/net/getnetbynis.c 145684 2005-04-29 17:36:54Z ume $");
28
29#include <sys/param.h>
30#include <sys/socket.h>
31#include <netinet/in.h>
32#include <arpa/inet.h>
33#include <netdb.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <ctype.h>
37#include <errno.h>
38#include <string.h>
39#include <stdarg.h>
40#include <nsswitch.h>
41#include <arpa/nameser.h>
42#ifdef YP
43#include <rpc/rpc.h>
44#include <rpcsvc/yp_prot.h>
45#include <rpcsvc/ypclnt.h>
46#endif
47#include "netdb_private.h"
48
49#ifdef YP
50static int
51_getnetbynis(const char *name, char *map, int af, struct netent *ne,
52    struct netent_data *ned)
53{
54	char *p, *bp, *ep;
55	char *cp, **q;
56	char *result;
57	int resultlen, len;
58	char ypbuf[YPMAXRECORD + 2];
59
60	switch(af) {
61	case AF_INET:
62		break;
63	default:
64	case AF_INET6:
65		errno = EAFNOSUPPORT;
66		return -1;
67	}
68
69	if (ned->yp_domain == (char *)NULL)
70		if (yp_get_default_domain (&ned->yp_domain))
71			return -1;
72
73	if (yp_match(ned->yp_domain, map, name, strlen(name), &result,
74	    &resultlen))
75		return -1;
76
77	bcopy((char *)result, (char *)&ypbuf, resultlen);
78	ypbuf[resultlen] = '\0';
79	free(result);
80	result = (char *)&ypbuf;
81
82	if ((cp = index(result, '\n')))
83		*cp = '\0';
84
85	cp = strpbrk(result, " \t");
86	*cp++ = '\0';
87	bp = ned->netbuf;
88	ep = ned->netbuf + sizeof ned->netbuf;
89	len = strlen(result) + 1;
90	if (ep - bp < len) {
91		h_errno = NO_RECOVERY;
92		return -1;
93	}
94	strlcpy(bp, result, ep - bp);
95	ne->n_name = bp;
96	bp += len;
97
98	while (*cp == ' ' || *cp == '\t')
99		cp++;
100
101	ne->n_net = inet_network(cp);
102	ne->n_addrtype = AF_INET;
103
104	q = ne->n_aliases = ned->net_aliases;
105	cp = strpbrk(cp, " \t");
106	if (cp != NULL)
107		*cp++ = '\0';
108	while (cp && *cp) {
109		if (*cp == ' ' || *cp == '\t') {
110			cp++;
111			continue;
112		}
113		if (q > &ned->net_aliases[_MAXALIASES - 1])
114			break;
115		p = strpbrk(cp, " \t");
116		if (p != NULL)
117			*p++ = '\0';
118		len = strlen(cp) + 1;
119		if (ep - bp < len)
120			break;
121		strlcpy(bp, cp, ep - bp);
122		*q++ = bp;
123		bp += len;
124		cp = p;
125	}
126	*q = NULL;
127	return 0;
128}
129#endif /* YP */
130
131int
132_nis_getnetbyname(void *rval, void *cb_data, va_list ap)
133{
134#ifdef YP
135	const char *name;
136	struct netent *ne;
137	struct netent_data *ned;
138	int error;
139
140	name = va_arg(ap, const char *);
141	ne = va_arg(ap, struct netent *);
142	ned = va_arg(ap, struct netent_data *);
143
144	error = _getnetbynis(name, "networks.byname", AF_INET, ne, ned);
145	return (error == 0) ? NS_SUCCESS : NS_NOTFOUND;
146#else
147	return NS_UNAVAIL;
148#endif
149
150}
151
152int
153_nis_getnetbyaddr(void *rval, void *cb_data, va_list ap)
154{
155#ifdef YP
156	unsigned long addr;
157	int af;
158	struct netent *ne;
159	struct netent_data *ned;
160	char *str, *cp;
161	unsigned long net2;
162	int nn;
163	unsigned int netbr[4];
164	char buf[MAXDNAME];
165	int error;
166
167	addr = va_arg(ap, unsigned long);
168	af = va_arg(ap, int);
169	ne = va_arg(ap, struct netent *);
170	ned = va_arg(ap, struct netent_data *);
171
172	if (af != AF_INET) {
173		errno = EAFNOSUPPORT;
174		return NS_UNAVAIL;
175	}
176
177        for (nn = 4, net2 = addr; net2; net2 >>= 8) {
178                netbr[--nn] = net2 & 0xff;
179	}
180
181	switch (nn) {
182	case 3:		/* Class A */
183		sprintf(buf, "%u", netbr[3]);
184		break;
185        case 2:		/* Class B */
186		sprintf(buf, "%u.%u", netbr[2], netbr[3]);
187		break;
188        case 1:		/* Class C */
189		sprintf(buf, "%u.%u.%u", netbr[1], netbr[2], netbr[3]);
190                break;
191        case 0:		/* Class D - E */
192		sprintf(buf, "%u.%u.%u.%u", netbr[0], netbr[1],
193			netbr[2], netbr[3]);
194		break;
195	}
196
197	str = (char *)&buf;
198	cp = str + (strlen(str) - 2);
199
200	while(!strcmp(cp, ".0")) {
201		*cp = '\0';
202		cp = str + (strlen(str) - 2);
203	}
204
205	error = _getnetbynis(str, "networks.byaddr", af, ne, ned);
206	return (error == 0) ? NS_SUCCESS : NS_NOTFOUND;
207#else
208	return NS_UNAVAIL;
209#endif /* YP */
210}
211