StdLib/BsdSocketLib/getnetbynis.c

   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 *
  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 *
 123 _getnetbynisname(const char *name)
 124 {
 125         return _getnetbynis(name, "networks.byname", AF_INET);
 126 }
 127
 128 struct netent *
 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 }