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miniupnpd: Add function addr_is_reserved() to check if address is private/reserved and therefore not for public port forwarding

This commit is contained in:
Pali Rohár 2018-05-19 13:31:14 +02:00
parent 4f53b322fd
commit c35935c61d
3 changed files with 50 additions and 0 deletions
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40
miniupnpd/getifaddr.c
View File

@ -259,3 +259,43 @@ find_ipv6_addr(const char * ifname,
}
#endif
/* List of IP address blocks which are private / reserved and therefore not suitable for public external IP addresses */
/* If interface has IP address from one of this block, then it is either behind NAT or port forwarding is impossible */
#define IP(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
#define MSK(m) (32-(m))
static 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(16) }, /* 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
int
addr_is_reserved(struct in_addr * addr)
{
uint32_t address = ntohl(addr->s_addr);
size_t i;
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;
}

4
miniupnpd/getifaddr.h
View File

@ -28,5 +28,9 @@ int
find_ipv6_addr(const char * ifname,
char * dst, int n);
/* check if address is in private / reserved block (e.g. local area network) */
int
addr_is_reserved(struct in_addr * addr);
#endif

6
miniupnpd/testupnpdescgen.c
View File

@ -54,6 +54,12 @@ int getifaddr(const char * ifname, char * buf, int len, struct in_addr * addr, s
return 0;
}
int addr_is_reserved(struct in_addr * addr)
{
UNUSED(addr);
return 0;
}
int upnp_get_portmapping_number_of_entries(void)
{
return 42;