Work on TcpListener and TcpSocket.

include/NetworkEncoding.h

@@ -47,5 +47,20 @@ inline double ntohd(double val)
     return val;
 }
 
+//Windows and UNIX require some different headers.
+//We also need some compatibility defines for cross platform support.
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <winsock2.h>
+#include <windows.h>
+#include <ws2tcpip.h>
+#else
+#define closesocket(x) close(x)
+#define INVALID_SOCKET 0
+#define SOCKET_ERROR -1
+#include <netdb.h>
+#include <unistd.h>
+#endif
+
 
 #endif //FRNETLIB_NETWORKENCODING_H

include/Packet.h

@@ -17,7 +17,7 @@ public:
      *
      * @return A string containing all of the data added to the packet
      */
-    inline const std::string &construct_packet()
+    inline const std::string &construct_packet() const
     {
         return buffer;
     }

include/Socket.h

@@ -6,11 +6,63 @@
 #define FRNETLIB_SOCKET_H
 
 
+#include "Packet.h"
+
 class Socket
 {
 public:
+    enum Status
+    {
+        Unknown = 0,
+        Success = 1,
+        ListenFailed = 2,
+        BindFailed = 3
+    };
 
-private:
+    /*!
+     * Send a packet through the socket
+     *
+     * @param packet The packet to send
+     * @return True on success, false on failure.
+     */
+    virtual bool send(const Packet &packet)=0;
+
+    /*!
+     * Receive a packet through the socket
+     *
+     * @param packet The packet to receive
+     * @return True on success, false on failure.
+     */
+    virtual bool receive(Packet &packet)=0;
+
+    /*!
+     * Close the connection.
+     */
+    virtual void close()=0;
+
+    /*!
+     * Sets the socket's printable remote address
+     *
+     * @param addr The string address
+     */
+    inline virtual void set_remote_address(const std::string &addr)
+    {
+        remote_address = addr;
+    }
+
+    /*!
+     * Gets the socket's printable remote address
+     *
+     * @return The string address
+     */
+    inline virtual const std::string &get_remote_address()
+    {
+        return remote_address;
+    }
+
+protected:
+    int socket_descriptor;
+    std::string remote_address;
 };
 
 

include/TcpListener.h

@@ -4,12 +4,43 @@
 
 #ifndef FRNETLIB_TCPLISTENER_H
 #define FRNETLIB_TCPLISTENER_H
+#include <string>
+#include <netdb.h>
+#include "TcpSocket.h"
+#include "Socket.h"
+#include "NetworkEncoding.h"
 
+namespace fr
+{
 
 class TcpListener
 {
+public:
+    TcpListener();
 
+    /*!
+     * Listens to the given port for connections
+     *
+     * @param port The port to bind to
+     * @return If the operation was successful
+     */
+    Socket::Status listen(const std::string &port);
+
+    /*!
+     * Accepts a new connection.
+     *
+     * @param client Where to store the connection information
+     * @return True on success. False on failure.
+     */
+    Socket::Status accept(TcpSocket &client);
+
+private:
+    void *get_sin_addr(struct sockaddr *sa);
+    addrinfo hints;
+    int socket_descriptor;
 };
 
+}
+
 
 #endif //FRNETLIB_TCPLISTENER_H

include/TcpSocket.h

@@ -5,12 +5,47 @@
 #ifndef FRNETLIB_TCPSOCKET_H
 #define FRNETLIB_TCPSOCKET_H
 
+#include "Socket.h"
+
 namespace fr
 {
-    class TcpSocket
-    {
 
-    };
+class TcpSocket : public Socket
+{
+public:
+    /*!
+     * Send a packet through the socket
+     *
+     * @param packet The packet to send
+     * @return True on success, false on failure.
+     */
+    virtual bool send(const Packet &packet);
+
+    /*!
+     * Receive a packet through the socket
+     *
+     * @param packet The packet to receive
+     * @return True on success, false on failure.
+     */
+    virtual bool receive(Packet &packet);
+
+    /*!
+     * Close the connection.
+     */
+    virtual void close();
+
+    /*!
+     * Sets the socket file descriptor.
+     *
+     * @param descriptor The socket descriptor.
+     */
+    void set_descriptor(int descriptor);
+
+private:
+    ssize_t read_recv();
+    std::string unprocessed_buffer;
+};
+
 }
 
 

src/TcpListener.cpp

@@ -3,3 +3,98 @@
 //
 
 #include "TcpListener.h"
+
+namespace fr
+{
+
+    const int yes = 1;
+    const int no = 0;
+
+    TcpListener::TcpListener()
+    {
+        memset(&hints, 0, sizeof(addrinfo));
+        hints.ai_family = AF_UNSPEC; //IPv6 or IPv4. NOTE: Might want to make configurable.
+        hints.ai_socktype = SOCK_STREAM; //TCP
+        hints.ai_flags = AI_PASSIVE; //Have the IP filled in for us
+    }
+
+    Socket::Status TcpListener::listen(const std::string &port)
+    {
+        addrinfo *info;
+        if(int status = getaddrinfo(NULL, port.c_str(), &hints, &info) != 0)
+        {
+            return Socket::Status::Unknown;
+        }
+        //Try each of the results until we listen successfully
+        addrinfo *c;
+        for(c = info; c != nullptr; c = c->ai_next)
+        {
+            //Attempt to connect
+            if((socket_descriptor = socket(c->ai_family, c->ai_socktype, c->ai_protocol)) == INVALID_SOCKET)
+            {
+                continue;
+            }
+            //Set address re-use option
+            if(setsockopt(socket_descriptor, SOL_SOCKET, SO_REUSEADDR, (char*)&yes, sizeof(int)) == SOCKET_ERROR)
+            {
+                continue;
+            }
+
+            //Attempt to bind
+            if(bind(socket_descriptor, c->ai_addr, c->ai_addrlen) == SOCKET_ERROR)
+            {
+                closesocket(socket_descriptor);
+                continue;
+            }
+            break;
+        }
+
+        //Check that we've actually bound
+        if(c == nullptr)
+        {
+            return Socket::Status::BindFailed;
+        }
+
+        //We're done with this now, cleanup
+        freeaddrinfo(info);
+
+        //Listen to socket
+        if(::listen(socket_descriptor, 10) == SOCKET_ERROR)
+        {
+            return Socket::ListenFailed;
+        }
+        return Socket::Success;
+    }
+
+    Socket::Status TcpListener::accept(TcpSocket &client)
+    {
+        //Prepare to wait for the client
+        sockaddr_storage client_addr;
+        int client_descriptor;
+        char client_printable_addr[INET6_ADDRSTRLEN];
+
+        //Accept one
+        socklen_t client_addr_len = sizeof client_addr;
+        client_descriptor = ::accept(socket_descriptor, (sockaddr*)&client_addr, &client_addr_len);
+        if(client_descriptor == SOCKET_ERROR)
+            return Socket::Unknown;
+
+        //Get printable address. If we failed then set it as just 'unknown'
+        int err = getnameinfo((sockaddr*)&client_addr, client_addr_len, client_printable_addr, sizeof(client_printable_addr), 0,0,NI_NUMERICHOST);
+        if(err != 0)
+            strcpy(client_printable_addr, "unknown");
+
+        //Set client data
+        client.set_descriptor(client_descriptor);
+        client.set_remote_address(client_printable_addr);
+
+        return Socket::Success;
+    }
+
+    void *TcpListener::get_sin_addr(struct sockaddr *sa)
+    {
+        if(sa->sa_family == AF_INET)
+            return &(((sockaddr_in*)sa)->sin_addr);
+        return &(((sockaddr_in6*)sa)->sin6_addr);
+    }
+}

src/TcpSocket.cpp

@@ -7,4 +7,44 @@
 namespace fr
 {
 
+    bool TcpSocket::send(const Packet &packet)
+    {
+        size_t send_index = 0;
+        size_t sent = 0;
+
+        while(sent < packet.construct_packet().size())
+        {
+            ssize_t a = ::send(socket_descriptor, &packet.construct_packet()[send_index], packet.construct_packet().size(), 0);
+            if(a < 1)
+                return false;
+            sent += a;
+        }
+
+        return true;
+    }
+
+    bool TcpSocket::receive(Packet &packet)
+    {
+        std::string recv_buffer;
+
+        //Read packet length
+        uint32_t packet_length = 0;
+
+        return false;
+    }
+
+    void TcpSocket::close()
+    {
+        ::close(socket_descriptor);
+    }
+
+    ssize_t TcpSocket::read_recv()
+    {
+        return 0;
+    }
+
+    void TcpSocket::set_descriptor(int descriptor)
+    {
+        socket_descriptor = descriptor;
+    }
 }