lib/libc/net/gethostbynis.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  * $FreeBSD: src/lib/libc/net/gethostbynis.c,v 1.10.2.1 2000/10/01 16:39:47 nectar Exp $
  26  * $DragonFly: src/lib/libc/net/gethostbynis.c,v 1.4 2005/11/13 02:04:47 swildner Exp $
  27  */
  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 #ifdef YP
  41 #include <rpc/rpc.h>
  42 #include <rpcsvc/yp_prot.h>
  43 #include <rpcsvc/ypclnt.h>
  44 #endif
  45
  46 #define MAXALIASES      35
  47 #define MAXADDRS        35
  48
  49 extern int h_errno;
  50
  51 #ifdef YP
  52 static char *host_aliases[MAXALIASES];
  53 static char hostaddr[MAXADDRS];
  54 static char *host_addrs[2];
  55 #endif /* YP */
  56
  57 static struct hostent *
  58 _gethostbynis(const char *name, char *map, int af)
  59 {
  60 #ifdef YP
  61         char *cp, **q;
  62         char *result;
  63         int resultlen,size;
  64         static struct hostent h;
  65         static char *domain = (char *)NULL;
  66         static char ypbuf[YPMAXRECORD + 2];
  67
  68         switch(af) {
  69         case AF_INET:
  70                 size = NS_INADDRSZ;
  71                 break;
  72         default:
  73         case AF_INET6:
  74                 size = NS_IN6ADDRSZ;
  75                 errno = EAFNOSUPPORT;
  76                 h_errno = NETDB_INTERNAL;
  77                 return NULL;
  78         }
  79
  80         if (domain == (char *)NULL)
  81                 if (yp_get_default_domain (&domain)) {
  82                         h_errno = NETDB_INTERNAL;
  83                         return ((struct hostent *)NULL);
  84                 }
  85
  86         if (yp_match(domain, map, name, strlen(name), &result, &resultlen)) {
  87                 h_errno = HOST_NOT_FOUND;
  88                 return ((struct hostent *)NULL);
  89         }
  90
  91         /* avoid potential memory leak */
  92         bcopy((char *)result, (char *)&ypbuf, resultlen);
  93         ypbuf[resultlen] = '\0';
  94         free(result);
  95         result = (char *)&ypbuf;
  96
  97         if ((cp = index(result, '\n')))
  98                 *cp = '\0';
  99
 100         cp = strpbrk(result, " \t");
 101         *cp++ = '\0';
 102         h.h_addr_list = host_addrs;
 103         h.h_addr = hostaddr;
 104         *((u_long *)h.h_addr) = inet_addr(result);
 105         h.h_length = size;
 106         h.h_addrtype = AF_INET;
 107         while (*cp == ' ' || *cp == '\t')
 108                 cp++;
 109         h.h_name = cp;
 110         q = h.h_aliases = host_aliases;
 111         cp = strpbrk(cp, " \t");
 112         if (cp != NULL)
 113                 *cp++ = '\0';
 114         while (cp && *cp) {
 115                 if (*cp == ' ' || *cp == '\t') {
 116                         cp++;
 117                         continue;
 118                 }
 119                 if (q < &host_aliases[MAXALIASES - 1])
 120                         *q++ = cp;
 121                 cp = strpbrk(cp, " \t");
 122                 if (cp != NULL)
 123                         *cp++ = '\0';
 124         }
 125         *q = NULL;
 126         return (&h);
 127 #else
 128         return (NULL);
 129 #endif /* YP */
 130 }
 131
 132 struct hostent *
 133 _gethostbynisname(const char *name, int af)
 134 {
 135         return _gethostbynis(name, "hosts.byname", af);
 136 }
 137
 138 struct hostent *
 139 _gethostbynisaddr(const char *addr, int len, int af)
 140 {
 141         return _gethostbynis(inet_ntoa(*(struct in_addr *)addr),"hosts.byaddr", af);
 142 }