usr/src/lib/gss_mechs/mech_krb5/krb5/os/hostaddr.c

   1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  */
   4 /*
   5  * lib/krb5/os/hostaddr.c
   6  *
   7  * Copyright 1990,1991 by the Massachusetts Institute of Technology.
   8  * All Rights Reserved.
   9  *
  10  * Export of this software from the United States of America may
  11  *   require a specific license from the United States Government.
  12  *   It is the responsibility of any person or organization contemplating
  13  *   export to obtain such a license before exporting.
  14  *
  15  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
  16  * distribute this software and its documentation for any purpose and
  17  * without fee is hereby granted, provided that the above copyright
  18  * notice appear in all copies and that both that copyright notice and
  19  * this permission notice appear in supporting documentation, and that
  20  * the name of M.I.T. not be used in advertising or publicity pertaining
  21  * to distribution of the software without specific, written prior
  22  * permission.  Furthermore if you modify this software you must label
  23  * your software as modified software and not distribute it in such a
  24  * fashion that it might be confused with the original M.I.T. software.
  25  * M.I.T. makes no representations about the suitability of
  26  * this software for any purpose.  It is provided "as is" without express
  27  * or implied warranty.
  28  *
  29  * This routine returns a list of krb5 addresses given a hostname.
  30  *
  31  */
  32
  33 #include "k5-int.h"
  34 #include <locale.h>
  35 #include "fake-addrinfo.h"
  36
  37 krb5_error_code
  38 krb5_os_hostaddr(krb5_context context, const char *name, krb5_address ***ret_addrs)
  39 {
  40     krb5_error_code     retval;
  41     krb5_address        **addrs;
  42     int                 i, j, r;
  43     struct addrinfo hints, *ai, *aip;
  44
  45     if (!name) {
  46         return KRB5_ERR_BAD_HOSTNAME;
  47     }
  48
  49     memset (&hints, 0, sizeof (hints));
  50     hints.ai_flags = AI_NUMERICHOST;
  51     /* We don't care what kind at this point, really, but without
  52        this, we can get back multiple sockaddrs per address, for
  53        SOCK_DGRAM, SOCK_STREAM, and SOCK_RAW.  I haven't checked if
  54        that's what the spec indicates.  */
  55     hints.ai_socktype = SOCK_DGRAM;
  56
  57     r = getaddrinfo (name, 0, &hints, &ai);
  58     if (r && AI_NUMERICHOST != 0) {
  59         hints.ai_flags &= ~AI_NUMERICHOST;
  60         r = getaddrinfo (name, 0, &hints, &ai);
  61     }
  62     if (r) {
  63         krb5_set_error_message(context, KRB5_ERR_BAD_HOSTNAME,
  64                             dgettext(TEXT_DOMAIN,
  65                                     "Hostname cannot be canonicalized for '%s': %s"),
  66                             name, strerror(r));
  67         return KRB5_ERR_BAD_HOSTNAME;
  68     }
  69
  70     for (i = 0, aip = ai; aip; aip = aip->ai_next) {
  71         switch (aip->ai_addr->sa_family) {
  72         case AF_INET:
  73 #ifdef KRB5_USE_INET6
  74         case AF_INET6:
  75 #endif
  76             i++;
  77         default:
  78             /* Ignore addresses of unknown families.  */
  79             ;
  80         }
  81     }
  82
  83     addrs = malloc ((i+1) * sizeof(*addrs));
  84     if (!addrs)
  85         return errno;
  86
  87     for (j = 0; j < i + 1; j++)
  88         addrs[j] = 0;
  89
  90     for (i = 0, aip = ai; aip; aip = aip->ai_next) {
  91         void *ptr;
  92         size_t addrlen;
  93         int atype;
  94
  95         switch (aip->ai_addr->sa_family) {
  96         case AF_INET:
  97             addrlen = sizeof (struct in_addr);
  98             /*LINTED*/
  99             ptr = &sa2sin(aip->ai_addr)->sin_addr;
 100             atype = ADDRTYPE_INET;
 101             break;
 102 #ifdef KRB5_USE_INET6
 103         case AF_INET6:
 104             addrlen = sizeof (struct in6_addr);
 105             /*LINTED*/
 106             ptr = &sa2sin6(aip->ai_addr)->sin6_addr;
 107             atype = ADDRTYPE_INET6;
 108             break;
 109 #endif
 110         default:
 111             continue;
 112         }
 113         addrs[i] = (krb5_address *) malloc(sizeof(krb5_address));
 114         if (!addrs[i]) {
 115             retval = ENOMEM;
 116             goto errout;
 117         }
 118         addrs[i]->magic = KV5M_ADDRESS;
 119         addrs[i]->addrtype = atype;
 120         addrs[i]->length = addrlen;
 121         addrs[i]->contents = malloc(addrs[i]->length);
 122         if (!addrs[i]->contents) {
 123             retval = ENOMEM;
 124             goto errout;
 125         }
 126         memcpy (addrs[i]->contents, ptr, addrs[i]->length);
 127         i++;
 128     }
 129
 130     *ret_addrs = addrs;
 131     if (ai)
 132         freeaddrinfo(ai);
 133     return 0;
 134
 135 errout:
 136     /* Solaris Kerberos */
 137     if (addrs)
 138         krb5_free_addresses(context, addrs);
 139     if (ai)
 140         freeaddrinfo(ai);
 141     return retval;
 142
 143 }
 144