StdLib/BsdSocketLib/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
  26 #if defined(LIBC_SCCS) && !defined(lint)
  27 static char sccsid[] = "@(#)$Id: gethostbynis.c,v 1.1.1.1 2003/11/19 01:51:27 kyu3 Exp $";
  28 static char rcsid[] = "$Id: gethostbynis.c,v 1.1.1.1 2003/11/19 01:51:27 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 #ifdef YP
  42 #include <rpc/rpc.h>
  43 #include <rpcsvc/yp_prot.h>
  44 #include <rpcsvc/ypclnt.h>
  45 #endif
  46
  47 #define MAXALIASES      35
  48 #define MAXADDRS        35
  49
  50 #ifdef YP
  51 static char *host_aliases[MAXALIASES];
  52 static char hostaddr[MAXADDRS];
  53 static char *host_addrs[2];
  54 #endif /* YP */
  55
  56 static struct hostent *
  57 _gethostbynis(const char *name, char *map, int af)
  58 {
  59 #ifdef YP
  60         register char *cp, **q;
  61         char *result;
  62         int resultlen;
  63         static struct hostent h;
  64         static char *domain = (char *)NULL;
  65         static char ypbuf[YPMAXRECORD + 2];
  66
  67         switch(af) {
  68         case AF_INET:
  69                 break;
  70         default:
  71         case AF_INET6:
  72                 errno = EAFNOSUPPORT;
  73                 return NULL;
  74         }
  75
  76         if (domain == (char *)NULL)
  77                 if (yp_get_default_domain (&domain))
  78                         return ((struct hostent *)NULL);
  79
  80         if (yp_match(domain, map, name, strlen(name), &result, &resultlen))
  81                 return ((struct hostent *)NULL);
  82
  83         /* avoid potential memory leak */
  84         bcopy((char *)result, (char *)&ypbuf, resultlen);
  85         ypbuf[resultlen] = '\0';
  86         free(result);
  87         result = (char *)&ypbuf;
  88
  89         if ((cp = index(result, '\n')))
  90                 *cp = '\0';
  91
  92         cp = strpbrk(result, " \t");
  93         *cp++ = '\0';
  94         h.h_addr_list = host_addrs;
  95         h.h_addr = hostaddr;
  96         *((u_long *)h.h_addr) = inet_addr(result);
  97         h.h_length = sizeof(u_long);
  98         h.h_addrtype = AF_INET;
  99         while (*cp == ' ' || *cp == '\t')
 100                 cp++;
 101         h.h_name = cp;
 102         q = h.h_aliases = host_aliases;
 103         cp = strpbrk(cp, " \t");
 104         if (cp != NULL)
 105                 *cp++ = '\0';
 106         while (cp && *cp) {
 107                 if (*cp == ' ' || *cp == '\t') {
 108                         cp++;
 109                         continue;
 110                 }
 111                 if (q < &host_aliases[MAXALIASES - 1])
 112                         *q++ = cp;
 113                 cp = strpbrk(cp, " \t");
 114                 if (cp != NULL)
 115                         *cp++ = '\0';
 116         }
 117         *q = NULL;
 118         return (&h);
 119 #else
 120         return (NULL);
 121 #endif /* YP */
 122 }
 123
 124 struct hostent *
 125 _gethostbynisname(const char *name, int af)
 126 {
 127         return _gethostbynis(name, "hosts.byname", af);
 128 }
 129
 130 struct hostent *
 131 _gethostbynisaddr(const char *addr, int len, int af)
 132 {
 133         return _gethostbynis(inet_ntoa(*(struct in_addr *)addr),"hosts.byaddr", af);
 134 }