Don't ban localhost

src/common.h

@@ -309,6 +309,14 @@ struct raw_ip
 	}
 
 	FORCEINLINE bool operator!=(const raw_ip& other) const { return !operator==(other); }
+
+	FORCEINLINE bool is_localhost() const
+	{
+		static constexpr raw_ip localhost_ipv4 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x01 };
+		static constexpr raw_ip localhost_ipv6 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 };
+
+		return (*this == localhost_ipv4) || (*this == localhost_ipv6);
+	}
 };
 
 static_assert(sizeof(raw_ip) == 16, "struct raw_ip has invalid size");

src/tcp_server.inl

@@ -322,6 +322,10 @@ void TCPServer<READ_BUF_SIZE, WRITE_BUF_SIZE>::on_connect_failed(bool, const raw
 template<size_t READ_BUF_SIZE, size_t WRITE_BUF_SIZE>
 bool TCPServer<READ_BUF_SIZE, WRITE_BUF_SIZE>::is_banned(const raw_ip& ip)
 {
+	if (ip.is_localhost()) {
+		return false;
+	}
+
 	const auto cur_time = std::chrono::steady_clock::now();
 
 	MutexLock lock(m_bansLock);
@@ -495,6 +499,10 @@ void TCPServer<READ_BUF_SIZE, WRITE_BUF_SIZE>::print_status()
 template<size_t READ_BUF_SIZE, size_t WRITE_BUF_SIZE>
 void TCPServer<READ_BUF_SIZE, WRITE_BUF_SIZE>::ban(const raw_ip& ip, uint64_t seconds)
 {
+	if (ip.is_localhost()) {
+		return;
+	}
+
 	const auto ban_time = std::chrono::steady_clock::now() + std::chrono::seconds(seconds);
 
 	MutexLock lock(m_bansLock);