crypto/external/bsd/heimdal/dist/lib/roken/getnameinfo.c

   1 /*      $NetBSD: getnameinfo.c,v 1.1.1.1 2011/04/13 18:15:41 elric Exp $        */
   2
   3 /*
   4  * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <config.h>
  37
  38 #include <krb5/roken.h>
  39
  40 static int
  41 doit (int af,
  42       const void *addr,
  43       size_t addrlen,
  44       int port,
  45       char *host, size_t hostlen,
  46       char *serv, size_t servlen,
  47       int flags)
  48 {
  49     if (host != NULL) {
  50         if (flags & NI_NUMERICHOST) {
  51             if (inet_ntop (af, addr, host, hostlen) == NULL)
  52                 return EAI_SYSTEM;
  53         } else {
  54             struct hostent *he = gethostbyaddr (addr,
  55                                                 addrlen,
  56                                                 af);
  57             if (he != NULL) {
  58                 strlcpy (host, hostent_find_fqdn(he), hostlen);
  59                 if (flags & NI_NOFQDN) {
  60                     char *dot = strchr (host, '.');
  61                     if (dot != NULL)
  62                         *dot = '\0';
  63                 }
  64             } else if (flags & NI_NAMEREQD) {
  65                 return EAI_NONAME;
  66             } else if (inet_ntop (af, addr, host, hostlen) == NULL)
  67                 return EAI_SYSTEM;
  68         }
  69     }
  70
  71     if (serv != NULL) {
  72         if (flags & NI_NUMERICSERV) {
  73             snprintf (serv, servlen, "%u", ntohs(port));
  74         } else {
  75             const char *proto = "tcp";
  76             struct servent *se;
  77
  78             if (flags & NI_DGRAM)
  79                 proto = "udp";
  80
  81             se = getservbyport (port, proto);
  82             if (se == NULL) {
  83                 snprintf (serv, servlen, "%u", ntohs(port));
  84             } else {
  85                 strlcpy (serv, se->s_name, servlen);
  86             }
  87         }
  88     }
  89     return 0;
  90 }
  91
  92 /*
  93  *
  94  */
  95
  96 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
  97 getnameinfo(const struct sockaddr *sa, socklen_t salen,
  98             char *host, size_t hostlen,
  99             char *serv, size_t servlen,
 100             int flags)
 101 {
 102     switch (sa->sa_family) {
 103 #ifdef HAVE_IPV6
 104     case AF_INET6 : {
 105         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
 106
 107         return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr),
 108                      sin6->sin6_port,
 109                      host, hostlen,
 110                      serv, servlen,
 111                      flags);
 112     }
 113 #endif
 114     case AF_INET : {
 115         const struct sockaddr_in *sin4 = (const struct sockaddr_in *)sa;
 116
 117         return doit (AF_INET, &sin4->sin_addr, sizeof(sin4->sin_addr),
 118                      sin4->sin_port,
 119                      host, hostlen,
 120                      serv, servlen,
 121                      flags);
 122     }
 123     default :
 124         return EAI_FAMILY;
 125     }
 126 }