More work on TCP, splitted UDI arch dependent out of udi.h, slight work on AxWin

[tpg/acess2.git] / Modules / IPStack / tcp.c

diff --git a/Modules/IPStack/tcp.c b/Modules/IPStack/tcp.c
index 7537a4b..dd94b92 100644 (file)
--- a/Modules/IPStack/tcp.c
+++ b/Modules/IPStack/tcp.c
@@ -64,14 +64,45 @@ void TCP_StartConnection(tTCPConnection *Conn)
        
        hdr->SourcePort = Conn->LocalPort;
        hdr->DestPort = Conn->RemotePort;
-       hdr->SequenceNumber = rand();
+       Conn->NextSequenceSend = rand();
+       hdr->SequenceNumber = Conn->NextSequenceSend;
        hdr->DataOffset = (sizeof(tTCPHeader)+3)/4;
        hdr->Flags = TCP_FLAG_SYN;
+       hdr->WindowSize = 0;    // TODO
+       hdr->Checksum = 0;      // TODO
+       hdr->UrgentPointer = 0;
        // SEND PACKET
-       // Send a TCP SYN to the target to open the connection
+       TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
        return ;
 }
 
+/**
+ * \brief Sends a packet from the specified connection, calculating the checksums
+ * \param Conn Connection
+ * \param Length       Length of data
+ * \param Data Packet data
+ */
+void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
+{
+       size_t  buflen;
+       Uint32  *buf;
+       switch( Conn->Interface.Type )
+       {
+       case 4:
+               buflen = 4 + 4 + 4 + ((Length+1)&1);
+               buf = malloc( buflen );
+               buf[0] = Conn->Interface.IP4.Address.L;
+               buf[1] = Conn->RemoteIP.v4.L;
+               buf[2] = (htons(Length)<<16) | (6<<8) | 0;
+               Data->Checksum = 0;
+               memcpy( &buf[3], Data, buflen );
+               Data->Checksum = IPv4_Checksum( buf, buflen );
+               free(buf);
+               IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, sizeof(tTCPHeader), &hdr);
+               break;
+       }
+}
+
 /**
  * \fn void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
  * \brief Handles a packet from the IP Layer