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Implement isPrivateNetworkAddress() for IPv6

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This commit is contained in:
Cameron Gutman 2019-07-15 00:16:17 -07:00
parent 6245934462
commit 25dfbcfd41
1 changed files with 56 additions and 17 deletions
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73
src/PlatformSockets.c
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@ -348,29 +348,68 @@ int resolveHostName(const char* host, int family, int tcpTestPort, struct sockad
#endif
}
#ifndef __vita__
int isInSubnetV6(struct sockaddr_in6* sin6, unsigned char* subnet, int prefixLength) {
int i;
for (i = 0; i < prefixLength; i++) {
unsigned char mask = 1 << (i % 8);
if ((sin6->sin6_addr.s6_addr[i / 8] & mask) != (subnet[i / 8] & mask)) {
return 0;
}
}
return 1;
}
#endif
int isPrivateNetworkAddress(struct sockaddr_storage* address) {
unsigned int addr;
// We only count IPv4 addresses as possibly private for now
if (address->ss_family != AF_INET) {
return 0;
}
if (address->ss_family == AF_INET) {
unsigned int addr;
memcpy(&addr, &((struct sockaddr_in*)address)->sin_addr, sizeof(addr));
addr = htonl(addr);
memcpy(&addr, &((struct sockaddr_in*)address)->sin_addr, sizeof(addr));
addr = htonl(addr);
// 10.0.0.0/8
if ((addr & 0xFF000000) == 0x0A000000) {
return 1;
}
// 172.16.0.0/12
else if ((addr & 0xFFF00000) == 0xAC100000) {
return 1;
}
// 192.168.0.0/16
else if ((addr & 0xFFFF0000) == 0xC0A80000) {
return 1;
}
// 169.254.0.0/16
else if ((addr & 0xFFFF0000) == 0xA9FE0000) {
return 1;
}
}
#ifndef __vita__
else if (address->ss_family == AF_INET6) {
struct sockaddr_in6* sin6 = (struct sockaddr_in6*)address;
static unsigned char linkLocalPrefix[] = {0xfe, 0x80};
static unsigned char siteLocalPrefix[] = {0xfe, 0xc0};
static unsigned char uniqueLocalPrefix[] = {0xfc, 0x00};
// 10.0.0.0/8
if ((addr & 0xFF000000) == 0x0A000000) {
return 1;
}
// 172.16.0.0/12
else if ((addr & 0xFFF00000) == 0xAC100000) {
return 1;
}
// 192.168.0.0/16
else if ((addr & 0xFFFF0000) == 0xC0A80000) {
return 1;
// fe80::/10
if (isInSubnetV6(sin6, linkLocalPrefix, 10)) {
return 1;
}
// fec0::/10
else if (isInSubnetV6(sin6, siteLocalPrefix, 10)) {
return 1;
}
// fc00::/7
else if (isInSubnetV6(sin6, uniqueLocalPrefix, 7)) {
return 1;
}
}
#endif
return 0;
}