1 /*
2  * IP address processing
3  * Copyright (c) 2003-2006, Jouni Malinen <j@w1.fi>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * Alternatively, this software may be distributed under the terms of BSD
10  * license.
11  *
12  * See README and COPYING for more details.
13  */
14 
15 #include "includes.h"
16 
17 #include "common.h"
18 #include "ip_addr.h"
19 
20 const char * hostapd_ip_txt(const struct hostapd_ip_addr *addr, char *buf,
21 			    size_t buflen)
22 {
23 	if (buflen == 0 || addr == NULL)
24 		return NULL;
25 
26 	if (addr->af == AF_INET) {
27 		os_strlcpy(buf, inet_ntoa(addr->u.v4), buflen);
28 	} else {
29 		buf[0] = '\0';
30 	}
31 #ifdef CONFIG_IPV6
32 	if (addr->af == AF_INET6) {
33 		if (inet_ntop(AF_INET6, &addr->u.v6, buf, buflen) == NULL)
34 			buf[0] = '\0';
35 	}
36 #endif /* CONFIG_IPV6 */
37 
38 	return buf;
39 }
40 
41 
42 int hostapd_ip_diff(struct hostapd_ip_addr *a, struct hostapd_ip_addr *b)
43 {
44 	if (a == NULL && b == NULL)
45 		return 0;
46 	if (a == NULL || b == NULL)
47 		return 1;
48 
49 	switch (a->af) {
50 	case AF_INET:
51 		if (a->u.v4.s_addr != b->u.v4.s_addr)
52 			return 1;
53 		break;
54 #ifdef CONFIG_IPV6
55 	case AF_INET6:
56 		if (os_memcmp(&a->u.v6, &b->u.v6, sizeof(a->u.v6)) != 0)
57 			return 1;
58 		break;
59 #endif /* CONFIG_IPV6 */
60 	}
61 
62 	return 0;
63 }
64 
65 
66 int hostapd_parse_ip_addr(const char *txt, struct hostapd_ip_addr *addr)
67 {
68 #ifndef CONFIG_NATIVE_WINDOWS
69 	if (inet_aton(txt, &addr->u.v4)) {
70 		addr->af = AF_INET;
71 		return 0;
72 	}
73 
74 #ifdef CONFIG_IPV6
75 	if (inet_pton(AF_INET6, txt, &addr->u.v6) > 0) {
76 		addr->af = AF_INET6;
77 		return 0;
78 	}
79 #endif /* CONFIG_IPV6 */
80 #endif /* CONFIG_NATIVE_WINDOWS */
81 
82 	return -1;
83 }
84