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/* $Id: addr_is_reserved.c,v 1.4 2021/03/02 23:40:32 nanard Exp $ */
/* vim: tabstop=4 shiftwidth=4 noexpandtab
* Project : miniupnp
* Web : http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
* Author : Thomas BERNARD
* copyright (c) 2005-2021 Thomas Bernard
* This software is subjet to the conditions detailed in the
* provided LICENSE file. */
#ifdef _WIN32
/* Win32 Specific includes and defines */
#include <winsock2.h>
#include <ws2tcpip.h>
#if !defined(_MSC_VER)
#include <stdint.h>
#else /* !defined(_MSC_VER) */
typedef unsigned long uint32_t;
#endif /* !defined(_MSC_VER) */
#else /* _WIN32 */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif /* _WIN32 */
/* List of IP address blocks which are private / reserved and therefore not suitable for public external IP addresses */
#define IP(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
#define MSK(m) (32-(m))
static const struct { uint32_t address; uint32_t rmask; } reserved[] = {
{ IP( 0, 0, 0, 0), MSK( 8) }, /* RFC1122 "This host on this network" */
{ IP( 10, 0, 0, 0), MSK( 8) }, /* RFC1918 Private-Use */
{ IP(100, 64, 0, 0), MSK(10) }, /* RFC6598 Shared Address Space */
{ IP(127, 0, 0, 0), MSK( 8) }, /* RFC1122 Loopback */
{ IP(169, 254, 0, 0), MSK(16) }, /* RFC3927 Link-Local */
{ IP(172, 16, 0, 0), MSK(12) }, /* RFC1918 Private-Use */
{ IP(192, 0, 0, 0), MSK(24) }, /* RFC6890 IETF Protocol Assignments */
{ IP(192, 0, 2, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-1) */
{ IP(192, 31, 196, 0), MSK(24) }, /* RFC7535 AS112-v4 */
{ IP(192, 52, 193, 0), MSK(24) }, /* RFC7450 AMT */
{ IP(192, 88, 99, 0), MSK(24) }, /* RFC7526 6to4 Relay Anycast */
{ IP(192, 168, 0, 0), MSK(16) }, /* RFC1918 Private-Use */
{ IP(192, 175, 48, 0), MSK(24) }, /* RFC7534 Direct Delegation AS112 Service */
{ IP(198, 18, 0, 0), MSK(15) }, /* RFC2544 Benchmarking */
{ IP(198, 51, 100, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-2) */
{ IP(203, 0, 113, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-3) */
{ IP(224, 0, 0, 0), MSK( 4) }, /* RFC1112 Multicast */
{ IP(240, 0, 0, 0), MSK( 4) }, /* RFC1112 Reserved for Future Use + RFC919 Limited Broadcast */
};
#undef IP
#undef MSK
/**
* @return 1 or 0
*/
int addr_is_reserved(const char * addr_str)
{
uint32_t addr_n, address;
size_t i;
#if defined(_WIN32) && _WIN32_WINNT < 0x0600 // _WIN32_WINNT_VISTA
addr_n = inet_addr(addr_str);
if (addr_n == INADDR_NONE)
return 1;
#else
/* was : addr_n = inet_addr(addr_str); */
if (inet_pton(AF_INET, addr_str, &addr_n) <= 0) {
/* error */
return 1;
}
#endif
address = ntohl(addr_n);
for (i = 0; i < sizeof(reserved)/sizeof(reserved[0]); ++i) {
if ((address >> reserved[i].rmask) == (reserved[i].address >> reserved[i].rmask))
return 1;
}
return 0;
}
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