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)
27 static char sccsid[] = "@(#)$Id: getnetbynis.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 Exp $";
28 static char rcsid[] = "$Id: getnetbynis.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 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 <netdb.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <ctype.h>
39 #include <errno.h>
40 #include <string.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
48 #define MAXALIASES 35
49 #define MAXADDRS 35
50
51 #ifdef YP
52 static char *host_aliases[MAXALIASES];
53 #endif /* YP */
54
55 static struct netent *
_getnetbynis(const char * name,char * map,int af)56 _getnetbynis(const char *name, char *map, int af)
57 {
58 #ifdef YP
59 register char *cp, **q;
60 static char *result;
61 int resultlen;
62 static struct netent h;
63 static char *domain = (char *)NULL;
64 static char ypbuf[YPMAXRECORD + 2];
65
66 switch(af) {
67 case AF_INET:
68 break;
69 default:
70 case AF_INET6:
71 errno = EAFNOSUPPORT;
72 return NULL;
73 }
74
75 if (domain == (char *)NULL)
76 if (yp_get_default_domain (&domain))
77 return (NULL);
78
79 if (yp_match(domain, map, name, strlen(name), &result, &resultlen))
80 return (NULL);
81
82 bcopy((char *)result, (char *)&ypbuf, resultlen);
83 ypbuf[resultlen] = '\0';
84 free(result);
85 result = (char *)&ypbuf;
86
87 if ((cp = index(result, '\n')))
88 *cp = '\0';
89
90 cp = strpbrk(result, " \t");
91 *cp++ = '\0';
92 h.n_name = result;
93
94 while (*cp == ' ' || *cp == '\t')
95 cp++;
96
97 h.n_net = inet_network(cp);
98 h.n_addrtype = AF_INET;
99
100 q = h.n_aliases = host_aliases;
101 cp = strpbrk(cp, " \t");
102 if (cp != NULL)
103 *cp++ = '\0';
104 while (cp && *cp) {
105 if (*cp == ' ' || *cp == '\t') {
106 cp++;
107 continue;
108 }
109 if (q < &host_aliases[MAXALIASES - 1])
110 *q++ = cp;
111 cp = strpbrk(cp, " \t");
112 if (cp != NULL)
113 *cp++ = '\0';
114 }
115 *q = NULL;
116 return (&h);
117 #else
118 return (NULL);
119 #endif
120 }
121
122 struct netent *
_getnetbynisname(const char * name)123 _getnetbynisname(const char *name)
124 {
125 return _getnetbynis(name, "networks.byname", AF_INET);
126 }
127
128 struct netent *
_getnetbynisaddr(unsigned long addr,int af)129 _getnetbynisaddr(unsigned long addr, int af)
130 {
131 char *str, *cp;
132 unsigned long net2;
133 int nn;
134 unsigned int netbr[4];
135 char buf[MAXDNAME];
136
137 if (af != AF_INET) {
138 errno = EAFNOSUPPORT;
139 return (NULL);
140 }
141
142 for (nn = 4, net2 = addr; net2; net2 >>= 8) {
143 netbr[--nn] = net2 & 0xff;
144 }
145
146 switch (nn) {
147 case 3: /* Class A */
148 sprintf(buf, "%u", netbr[3]);
149 break;
150 case 2: /* Class B */
151 sprintf(buf, "%u.%u", netbr[2], netbr[3]);
152 break;
153 case 1: /* Class C */
154 sprintf(buf, "%u.%u.%u", netbr[1], netbr[2], netbr[3]);
155 break;
156 case 0: /* Class D - E */
157 sprintf(buf, "%u.%u.%u.%u", netbr[0], netbr[1],
158 netbr[2], netbr[3]);
159 break;
160 }
161
162 str = (char *)&buf;
163 cp = str + (strlen(str) - 2);
164
165 while(!strcmp(cp, ".0")) {
166 *cp = '\0';
167 cp = str + (strlen(str) - 2);
168 }
169
170 return _getnetbynis(str, "networks.byaddr", af);
171 }
172