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Annotation of embedaddon/miniupnpd/miniupnpc/src/addr_is_reserved.c, revision 1.1.1.1

1.1       misho       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) */
                     16: typedef 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))
                     28: static 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:  */
                     54: int 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: }