Fawkes API  Fawkes Development Version
addr_comp.h
1 
2 /***************************************************************************
3  * addr_comp.h - address comparison
4  *
5  * Created: Tue Dec 13 15:17:43 2016
6  * Copyright 2006-2016 Tim Niemueller [www.niemueller.de]
7  *
8  ****************************************************************************/
9 
10 /* This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version. A runtime exception applies to
14  * this software (see LICENSE.GPL_WRE file mentioned below for details).
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU Library General Public License for more details.
20  *
21  * Read the full text in the LICENSE.GPL_WRE file in the doc directory.
22  */
23 
24 #ifndef __NETCOMM_UTILS_ADDR_COMP_H_
25 #define __NETCOMM_UTILS_ADDR_COMP_H_
26 
27 #include <netinet/in.h>
28 
29 namespace fawkes {
30 #if 0 /* just to make Emacs auto-indent happy */
31 }
32 #endif
33 
34 /** Compare two sockaddr structures.
35  * The comparison is based on address family first, and if the same based on
36  * the IP address. Works for AF_INET and AF_INET6.
37  * @param a first compare argument
38  * @param b second compare argument
39  * @return <0 if a is less than b, 0 if they are the same, or >0 otherwise
40  */
41 static inline int
42 sock_addr_cmp_addr(const struct sockaddr *a, const struct sockaddr *b)
43 {
44  if (a->sa_family != b->sa_family) {
45  return a->sa_family - b->sa_family;
46  } else if (a->sa_family == AF_INET) {
47  return (((sockaddr_in *)a)->sin_addr.s_addr - ((sockaddr_in *)b)->sin_addr.s_addr);
48  } else if (a->sa_family == AF_INET6) {
49  return (memcmp((char *) &((sockaddr_in6 *)a)->sin6_addr,
50  (char *) &((sockaddr_in6 *)a)->sin6_addr,
51  sizeof(in6_addr)));
52  }
53 }
54 
55 /** Compare concept comparator for sockaddr.
56  * @author Tim Niemueller
57  */
59 {
60  /** Compare sockaddr structures.
61  * uses sock_addr_cmp_addr().
62  * @param a first compare argument
63  * @param b second compare argument
64  * @return true if a < b, false otherwise
65  */
66  bool operator()(const struct sockaddr * & a, const struct sockaddr * & b) const
67  {
68  return (sock_addr_cmp_addr(a, b) < 0);
69  }
70 };
71 
72 } // end namespace fawkes
73 
74 #endif
Fawkes library namespace.
bool operator()(const struct sockaddr *&a, const struct sockaddr *&b) const
Compare sockaddr structures.
Definition: addr_comp.h:66
static int sock_addr_cmp_addr(const struct sockaddr *a, const struct sockaddr *b)
Compare two sockaddr structures.
Definition: addr_comp.h:42
Compare concept comparator for sockaddr.
Definition: addr_comp.h:58