Diff: main.cpp

Revision:

78:809c2631a5eb

Parent:

77:abf92baebb42

Child:

79:f0fc1c19a550

--- a/main.cpp	Sat Jul 08 10:10:12 2017 +0000
+++ b/main.cpp	Sun Jul 09 01:06:40 2017 +0000
@@ -601,7 +601,8 @@
     int tcpDataSize = tcpSize - headerSizeTCP; // size of data block after TCP header
     
     unsigned int ack = (seqtcp[0]<<24)|(seqtcp[1]<<16)|(seqtcp[2]<<8)|(seqtcp[3]) + tcpDataSize;
-    unsigned int seq = (acktcp[0]<<24)|(acktcp[1]<<16)|(acktcp[2]<<8)|(acktcp[3]);
+    //unsigned int seq = (acktcp[0]<<24)|(acktcp[1]<<16)|(acktcp[2]<<8)|(acktcp[3]);
+    
 
 #define TCP_FLAG_ACK (1<<4)
 #define TCP_FLAG_SYN (1<<1)
@@ -622,9 +623,11 @@
             if ( tcpDataSize != 1 ) return;
         case TCP_FLAG_SYN:
             flagsOut = TCP_FLAG_SYN | TCP_FLAG_ACK; // something wants to connect - ack it
+            ppp.seq = ppp.seq + 12345; // create a new sequence number (normally random)
             ack++; // for SYN flag we have to increase sequence by 1
             break;
         case TCP_FLAG_ACK | TCP_FLAG_PSH:
+            ppp.seq = (acktcp[0]<<24)|(acktcp[1]<<16)|(acktcp[2]<<8)|(acktcp[3]); // use their idea of our seq
             flagsOut = TCP_FLAG_ACK | TCP_FLAG_FIN; // for every push we answer once AND close the link
             fastResponse = 1; // we can respond fast to a push
             if ( strncmp(dataStart, "GET ", 4) == 0) { // do we see an http GET command
@@ -643,6 +646,8 @@
         default:
             return; // ignore remaining packets
     }
+    
+    unsigned int seq = ppp.seq;
 
     // The TCP flag handling is now done
     // Now we have to recalculate all the header sizes, swap IP address/port source and destination, and do the IP and TCP checksums
@@ -705,9 +710,10 @@
     } else {
         // normally, you wait 200 ms before sending a TCP packet
         // remove the wait to respond faster
-         wait(0.05);
+        // wait(0.2);
     }
     sendFrame(); // All done! Send the TCP packet
+    ppp.seq = ppp.seq + dataLen; // update our seq number
 }
 
 void dumpDataTCP()