Start IPv6 - Lord help me

include/tcpd/tcpconnection.h

@@ -19,8 +19,17 @@ typedef enum {
 typedef struct tcp_connection_t tcp_connection_t;
 
 struct tcp_connection_t {
+    // TODO: We should make it so only ONE of this needs to be available. 
+    // Because of my temporary "I just need something that works" horseshit that I'm about to write, you'll need IPv4 and IPv6 is optional.
+    // Note to self: Don't pull an IETF and some "NAT exists, we're fine" bullshit, because if we end up with our eqvivalent of Teredo or CGNAT, I'm gonna be fucking pissed.
+    // And no, the solution isn't "eh, just bind to 0.0.0.0 and ignore it", because if we do that, we'll inevitably end up with a host that only has IPv6 and then we'll be fucked.
+    // Honestly, I'm proud of whoever runs IPv6-only. Brave soul.
     int sockFd;
     struct sockaddr_in peerAddr;
+#ifdef USE_IPV6
+    int sockFd6; // For IPv6 support
+    struct sockaddr_in6 peerAddr6; // For IPv6 support
+#endif
     uint32_t connectionId;
     tcp_connection_role_t role;
 
@@ -54,6 +63,7 @@ int TcpConnection_SetDataBuffer(tcp_connection_t* conn, const unsigned char* dat
 void TcpConnection_ResetFramingState(tcp_connection_t* conn);
 int TcpConnection_FeedFramedData(tcp_connection_t* conn, const unsigned char* input, size_t inputLen);
 
+// This just takes a socket ID, so it's independent from the v4/v6 stuff. It works for both.
 int TcpConnection_SendRaw(int sockFd, const void* data, size_t len);
 int TcpConnection_SendFramed(tcp_connection_t* conn, const void* payload, size_t payloadLen);
 

include/tcpd/tcpserver.h

@@ -11,7 +11,12 @@
 typedef struct {
     int sockFd;
     struct sockaddr_in addr;
+#ifdef USE_IPV6
+    int sockFd6; // IPv6 support
+    struct sockaddr_in6 addr6; // IPv6 support
+#endif
     int opt;
+    int opt6; // IPv6 support
     int isRunning;
     void* owner;