usr/src/lib/gss_mechs/mech_krb5/include/socket-utils.h

   1 /*
   2  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6
   7 /*
   8  * Copyright (C) 2001,2005 by the Massachusetts Institute of Technology,
   9  * Cambridge, MA, USA.  All Rights Reserved.
  10  *
  11  * This software is being provided to you, the LICENSEE, by the
  12  * Massachusetts Institute of Technology (M.I.T.) under the following
  13  * license.  By obtaining, using and/or copying this software, you agree
  14  * that you have read, understood, and will comply with these terms and
  15  * conditions:
  16  *
  17  * Export of this software from the United States of America may
  18  * require a specific license from the United States Government.
  19  * It is the responsibility of any person or organization contemplating
  20  * export to obtain such a license before exporting.
  21  *
  22  * WITHIN THAT CONSTRAINT, permission to use, copy, modify and distribute
  23  * this software and its documentation for any purpose and without fee or
  24  * royalty is hereby granted, provided that you agree to comply with the
  25  * following copyright notice and statements, including the disclaimer, and
  26  * that the same appear on ALL copies of the software and documentation,
  27  * including modifications that you make for internal use or for
  28  * distribution:
  29  *
  30  * THIS SOFTWARE IS PROVIDED "AS IS", AND M.I.T. MAKES NO REPRESENTATIONS
  31  * OR WARRANTIES, EXPRESS OR IMPLIED.  By way of example, but not
  32  * limitation, M.I.T. MAKES NO REPRESENTATIONS OR WARRANTIES OF
  33  * MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF
  34  * THE LICENSED SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
  35  * PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
  36  *
  37  * The name of the Massachusetts Institute of Technology or M.I.T. may NOT
  38  * be used in advertising or publicity pertaining to distribution of the
  39  * software.  Title to copyright in this software and any associated
  40  * documentation shall at all times remain with M.I.T., and USER agrees to
  41  * preserve same.
  42  *
  43  * Furthermore if you modify this software you must label
  44  * your software as modified software and not distribute it in such a
  45  * fashion that it might be confused with the original M.I.T. software.
  46  */
  47
  48 #ifndef SOCKET_UTILS_H
  49 #define SOCKET_UTILS_H
  50
  51 /* Some useful stuff cross-platform for manipulating socket addresses.
  52    We assume at least ipv4 sockaddr_in support.  The sockaddr_storage
  53    stuff comes from the ipv6 socket api enhancements; socklen_t is
  54    provided on some systems; the rest is just convenience for internal
  55    use in the krb5 tree.
  56
  57    Do NOT install this file.  */
  58
  59 /* for HAVE_SOCKLEN_T, KRB5_USE_INET6, etc */
  60 #include "autoconf.h"
  61 /* for sockaddr_storage */
  62 #include "port-sockets.h"
  63 /* for "inline" if needed */
  64 #include "k5-platform.h"
  65
  66 #if defined (__GNUC__)
  67 /*
  68  * There's a lot of confusion between pointers to different sockaddr
  69  * types, and pointers with different degrees of indirection, as in
  70  * the locate_kdc type functions.  Use these function to ensure we
  71  * don't do something silly like cast a "sockaddr **" to a
  72  * "sockaddr_in *".
  73  *
  74  * The casts to (void *) are to get GCC to shut up about alignment
  75  * increasing.
  76  */
  77 static __inline__ struct sockaddr_in *sa2sin (struct sockaddr *sa)
  78 {
  79     return (struct sockaddr_in *) (void *) sa;
  80 }
  81 #ifdef KRB5_USE_INET6
  82 static __inline__ struct sockaddr_in6 *sa2sin6 (struct sockaddr *sa)
  83 {
  84     return (struct sockaddr_in6 *) (void *) sa;
  85 }
  86 #endif
  87 static __inline__ struct sockaddr *ss2sa (struct sockaddr_storage *ss)
  88 {
  89     return (struct sockaddr *) ss;
  90 }
  91 static __inline__ struct sockaddr_in *ss2sin (struct sockaddr_storage *ss)
  92 {
  93     return (struct sockaddr_in *) ss;
  94 }
  95 #ifdef KRB5_USE_INET6
  96 static __inline__ struct sockaddr_in6 *ss2sin6 (struct sockaddr_storage *ss)
  97 {
  98     return (struct sockaddr_in6 *) ss;
  99 }
 100 #endif
 101 #else
 102 #define sa2sin(S)       ((struct sockaddr_in *)(S))
 103 #define sa2sin6(S)      ((struct sockaddr_in6 *)(S))
 104 #define ss2sa(S)        ((struct sockaddr *)(S))
 105 #define ss2sin(S)       ((struct sockaddr_in *)(S))
 106 #define ss2sin6(S)      ((struct sockaddr_in6 *)(S))
 107 #endif
 108
 109 #if !defined (socklen)
 110 /* socklen_t socklen (struct sockaddr *) */
 111 #  ifdef HAVE_SA_LEN
 112 #    define socklen(X) ((X)->sa_len)
 113 #  else
 114 #    ifdef KRB5_USE_INET6
 115 #      define socklen(X) ((X)->sa_family == AF_INET6 ? (socklen_t) sizeof (struct sockaddr_in6) : (X)->sa_family == AF_INET ? (socklen_t) sizeof (struct sockaddr_in) : (socklen_t) sizeof (struct sockaddr))
 116 #    else
 117 #      define socklen(X) ((X)->sa_family == AF_INET ? (socklen_t) sizeof (struct sockaddr_in) : (socklen_t) sizeof (struct sockaddr))
 118 #    endif
 119 #  endif
 120 #endif
 121
 122 #endif /* SOCKET_UTILS_H */