Implement isPrivateNetworkAddress() for IPv6

src/PlatformSockets.c

@@ -348,13 +348,26 @@ int resolveHostName(const char* host, int family, int tcpTestPort, struct sockad
 #endif
 }
 
-int isPrivateNetworkAddress(struct sockaddr_storage* address) {
+#ifndef __vita__
-    unsigned int addr;
+int isInSubnetV6(struct sockaddr_in6* sin6, unsigned char* subnet, int prefixLength) {
+    int i;
     
-    // We only count IPv4 addresses as possibly private for now
+    for (i = 0; i < prefixLength; i++) {
-    if (address->ss_family != AF_INET) {
+        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) {
+
+    // We only count IPv4 addresses as possibly private for now
+    if (address->ss_family == AF_INET) {
+        unsigned int addr;
 
         memcpy(&addr, &((struct sockaddr_in*)address)->sin_addr, sizeof(addr));
         addr = htonl(addr);
@@ -371,6 +384,32 @@ int isPrivateNetworkAddress(struct sockaddr_storage* address) {
         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};
+
+        // 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;
 }