1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright (C) 2001,2005 by the Massachusetts Institute of Technology,
* Cambridge, MA, USA. All Rights Reserved.
*
* This software is being provided to you, the LICENSEE, by the
* Massachusetts Institute of Technology (M.I.T.) under the following
* license. By obtaining, using and/or copying this software, you agree
* that you have read, understood, and will comply with these terms and
* conditions:
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify and distribute
* this software and its documentation for any purpose and without fee or
* royalty is hereby granted, provided that you agree to comply with the
* following copyright notice and statements, including the disclaimer, and
* that the same appear on ALL copies of the software and documentation,
* including modifications that you make for internal use or for
* distribution:
*
* THIS SOFTWARE IS PROVIDED "AS IS", AND M.I.T. MAKES NO REPRESENTATIONS
* OR WARRANTIES, EXPRESS OR IMPLIED. By way of example, but not
* limitation, M.I.T. MAKES NO REPRESENTATIONS OR WARRANTIES OF
* MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF
* THE LICENSED SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
* PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
*
* The name of the Massachusetts Institute of Technology or M.I.T. may NOT
* be used in advertising or publicity pertaining to distribution of the
* software. Title to copyright in this software and any associated
* documentation shall at all times remain with M.I.T., and USER agrees to
* preserve same.
*
* Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
*/
#ifndef SOCKET_UTILS_H
#define SOCKET_UTILS_H
/* Some useful stuff cross-platform for manipulating socket addresses.
We assume at least ipv4 sockaddr_in support. The sockaddr_storage
stuff comes from the ipv6 socket api enhancements; socklen_t is
provided on some systems; the rest is just convenience for internal
use in the krb5 tree.
Do NOT install this file. */
/* for HAVE_SOCKLEN_T etc */
#include "autoconf.h"
/* for sockaddr_storage */
#include "port-sockets.h"
/* for "inline" if needed */
#include "k5-platform.h"
/*
* There's a lot of confusion between pointers to different sockaddr
* types, and pointers with different degrees of indirection, as in
* the locate_kdc type functions. Use these function to ensure we
* don't do something silly like cast a "sockaddr **" to a
* "sockaddr_in *".
*
* The casts to (void *) are to get GCC to shut up about alignment
* increasing.
*/
static inline struct sockaddr_in *sa2sin (struct sockaddr *sa)
{
return (struct sockaddr_in *) (void *) sa;
}
static inline struct sockaddr_in6 *sa2sin6 (struct sockaddr *sa)
{
return (struct sockaddr_in6 *) (void *) sa;
}
static inline struct sockaddr *ss2sa (struct sockaddr_storage *ss)
{
return (struct sockaddr *) ss;
}
static inline struct sockaddr_in *ss2sin (struct sockaddr_storage *ss)
{
return (struct sockaddr_in *) ss;
}
static inline struct sockaddr_in6 *ss2sin6 (struct sockaddr_storage *ss)
{
return (struct sockaddr_in6 *) ss;
}
/* Set the IPv4 or IPv6 port on sa to port. Do nothing if sa is not an
* Internet socket. */
static inline void
sa_setport(struct sockaddr *sa, uint16_t port)
{
if (sa->sa_family == AF_INET)
sa2sin(sa)->sin_port = htons(port);
else if (sa->sa_family == AF_INET6)
sa2sin6(sa)->sin6_port = htons(port);
}
/* Get the Internet port number of sa, or 0 if it is not an Internet socket. */
static inline uint16_t
sa_getport(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET)
return ntohs(sa2sin(sa)->sin_port);
else if (sa->sa_family == AF_INET6)
return ntohs(sa2sin6(sa)->sin6_port);
else
return 0;
}
/* Return true if sa is an IPv4 or IPv6 socket address. */
static inline int
sa_is_inet(struct sockaddr *sa)
{
return sa->sa_family == AF_INET || sa->sa_family == AF_INET6;
}
/* Return true if sa is an IPv4 or IPv6 wildcard address. */
static inline int
sa_is_wildcard(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET6)
return IN6_IS_ADDR_UNSPECIFIED(&sa2sin6(sa)->sin6_addr);
else if (sa->sa_family == AF_INET)
return sa2sin(sa)->sin_addr.s_addr == INADDR_ANY;
return 0;
}
/* Return the length of an IPv4 or IPv6 socket structure; abort if it is
* neither. */
static inline socklen_t
sa_socklen(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET6)
return sizeof(struct sockaddr_in6);
else if (sa->sa_family == AF_INET)
return sizeof(struct sockaddr_in);
else
abort();
}
#endif /* SOCKET_UTILS_H */
|