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      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 */
    123