1/* $Id: addr_is_reserved.c,v 1.4 2021/03/02 23:40:32 nanard Exp $ */
2/* vim: tabstop=4 shiftwidth=4 noexpandtab
3 * Project : miniupnp
4 * Web : http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
5 * Author : Thomas BERNARD
6 * copyright (c) 2005-2021 Thomas Bernard
7 * This software is subjet to the conditions detailed in the
8 * provided LICENSE file. */
9#ifdef _WIN32
10/* Win32 Specific includes and defines */
11#include <winsock2.h>
12#include <ws2tcpip.h>
13#if !defined(_MSC_VER)
14#include <stdint.h>
15#else /* !defined(_MSC_VER) */
16typedef unsigned long uint32_t;
17#endif /* !defined(_MSC_VER) */
18#else /* _WIN32 */
19#include <sys/types.h>
20#include <sys/socket.h>
21#include <netinet/in.h>
22#include <arpa/inet.h>
23#endif /* _WIN32 */
24
25/* List of IP address blocks which are private / reserved and therefore not suitable for public external IP addresses */
26#define IP(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
27#define MSK(m) (32-(m))
28static const struct { uint32_t address; uint32_t rmask; } reserved[] = {
29 { IP( 0, 0, 0, 0), MSK( 8) }, /* RFC1122 "This host on this network" */
30 { IP( 10, 0, 0, 0), MSK( 8) }, /* RFC1918 Private-Use */
31 { IP(100, 64, 0, 0), MSK(10) }, /* RFC6598 Shared Address Space */
32 { IP(127, 0, 0, 0), MSK( 8) }, /* RFC1122 Loopback */
33 { IP(169, 254, 0, 0), MSK(16) }, /* RFC3927 Link-Local */
34 { IP(172, 16, 0, 0), MSK(12) }, /* RFC1918 Private-Use */
35 { IP(192, 0, 0, 0), MSK(24) }, /* RFC6890 IETF Protocol Assignments */
36 { IP(192, 0, 2, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-1) */
37 { IP(192, 31, 196, 0), MSK(24) }, /* RFC7535 AS112-v4 */
38 { IP(192, 52, 193, 0), MSK(24) }, /* RFC7450 AMT */
39 { IP(192, 88, 99, 0), MSK(24) }, /* RFC7526 6to4 Relay Anycast */
40 { IP(192, 168, 0, 0), MSK(16) }, /* RFC1918 Private-Use */
41 { IP(192, 175, 48, 0), MSK(24) }, /* RFC7534 Direct Delegation AS112 Service */
42 { IP(198, 18, 0, 0), MSK(15) }, /* RFC2544 Benchmarking */
43 { IP(198, 51, 100, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-2) */
44 { IP(203, 0, 113, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-3) */
45 { IP(224, 0, 0, 0), MSK( 4) }, /* RFC1112 Multicast */
46 { IP(240, 0, 0, 0), MSK( 4) }, /* RFC1112 Reserved for Future Use + RFC919 Limited Broadcast */
47};
48#undef IP
49#undef MSK
50
51/**
52 * @return 1 or 0
53 */
54int addr_is_reserved(const char * addr_str)
55{
56 uint32_t addr_n, address;
57 size_t i;
58
59#if defined(_WIN32) && _WIN32_WINNT < 0x0600 // _WIN32_WINNT_VISTA
60 addr_n = inet_addr(addr_str);
61 if (addr_n == INADDR_NONE)
62 return 1;
63#else
64 /* was : addr_n = inet_addr(addr_str); */
65 if (inet_pton(AF_INET, addr_str, &addr_n) <= 0) {
66 /* error */
67 return 1;
68 }
69#endif
70
71 address = ntohl(addr_n);
72
73 for (i = 0; i < sizeof(reserved)/sizeof(reserved[0]); ++i) {
74 if ((address >> reserved[i].rmask) == (reserved[i].address >> reserved[i].rmask))
75 return 1;
76 }
77
78 return 0;
79}
80