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 */
sa2sin(struct sockaddr * sa)77 static __inline__ struct sockaddr_in *sa2sin (struct sockaddr *sa)
78 {
79 return (struct sockaddr_in *) (void *) sa;
80 }
81 #ifdef KRB5_USE_INET6
sa2sin6(struct sockaddr * sa)82 static __inline__ struct sockaddr_in6 *sa2sin6 (struct sockaddr *sa)
83 {
84 return (struct sockaddr_in6 *) (void *) sa;
85 }
86 #endif
ss2sa(struct sockaddr_storage * ss)87 static __inline__ struct sockaddr *ss2sa (struct sockaddr_storage *ss)
88 {
89 return (struct sockaddr *) ss;
90 }
ss2sin(struct sockaddr_storage * ss)91 static __inline__ struct sockaddr_in *ss2sin (struct sockaddr_storage *ss)
92 {
93 return (struct sockaddr_in *) ss;
94 }
95 #ifdef KRB5_USE_INET6
ss2sin6(struct sockaddr_storage * ss)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