80 lines
2.8 KiB
C
80 lines
2.8 KiB
C
/* $Id: addr_is_reserved.c,v 1.2 2020/10/15 22:16:13 nanard Exp $ */
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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* Project : miniupnp
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* Web : http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
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* Author : Thomas BERNARD
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* copyright (c) 2005-2020 Thomas Bernard
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* This software is subjet to the conditions detailed in the
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* provided LICENSE file. */
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#ifdef _WIN32
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/* Win32 Specific includes and defines */
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#if !defined(_MSC_VER)
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#include <stdint.h>
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#else /* !defined(_MSC_VER) */
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typedef unsigned long uint32_t;
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#endif /* !defined(_MSC_VER) */
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#else /* _WIN32 */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#endif /* _WIN32 */
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/* List of IP address blocks which are private / reserved and therefore not suitable for public external IP addresses */
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#define IP(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
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#define MSK(m) (32-(m))
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static const struct { uint32_t address; uint32_t rmask; } reserved[] = {
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{ IP( 0, 0, 0, 0), MSK( 8) }, /* RFC1122 "This host on this network" */
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{ IP( 10, 0, 0, 0), MSK( 8) }, /* RFC1918 Private-Use */
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{ IP(100, 64, 0, 0), MSK(10) }, /* RFC6598 Shared Address Space */
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{ IP(127, 0, 0, 0), MSK( 8) }, /* RFC1122 Loopback */
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{ IP(169, 254, 0, 0), MSK(16) }, /* RFC3927 Link-Local */
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{ IP(172, 16, 0, 0), MSK(12) }, /* RFC1918 Private-Use */
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{ IP(192, 0, 0, 0), MSK(24) }, /* RFC6890 IETF Protocol Assignments */
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{ IP(192, 0, 2, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-1) */
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{ IP(192, 31, 196, 0), MSK(24) }, /* RFC7535 AS112-v4 */
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{ IP(192, 52, 193, 0), MSK(24) }, /* RFC7450 AMT */
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{ IP(192, 88, 99, 0), MSK(24) }, /* RFC7526 6to4 Relay Anycast */
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{ IP(192, 168, 0, 0), MSK(16) }, /* RFC1918 Private-Use */
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{ IP(192, 175, 48, 0), MSK(24) }, /* RFC7534 Direct Delegation AS112 Service */
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{ IP(198, 18, 0, 0), MSK(15) }, /* RFC2544 Benchmarking */
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{ IP(198, 51, 100, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-2) */
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{ IP(203, 0, 113, 0), MSK(24) }, /* RFC5737 Documentation (TEST-NET-3) */
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{ IP(224, 0, 0, 0), MSK( 4) }, /* RFC1112 Multicast */
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{ IP(240, 0, 0, 0), MSK( 4) }, /* RFC1112 Reserved for Future Use + RFC919 Limited Broadcast */
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};
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#undef IP
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#undef MSK
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/**
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* @return 1 or 0
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*/
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int addr_is_reserved(const char * addr_str)
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{
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uint32_t addr_n, address;
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size_t i;
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#if defined(_WIN32) && (!defined(_WIN32_WINNT_VISTA) || (_WIN32_WINNT < _WIN32_WINNT_VISTA))
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addr_n = inet_addr(addr_str);
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if (addr_n == INADDR_NONE)
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return 1;
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#else
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/* was : addr_n = inet_addr(addr_str); */
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if (inet_pton(AF_INET, addr_str, &addr_n) < 0) {
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/* error */
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return 1;
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}
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#endif
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address = ntohl(addr_n);
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for (i = 0; i < sizeof(reserved)/sizeof(reserved[0]); ++i) {
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if ((address >> reserved[i].rmask) == (reserved[i].address >> reserved[i].rmask))
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return 1;
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}
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return 0;
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}
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