doc any doc file (rfc, source documentation)

src any source file

src/others some test driven development milestones

src/pcs packet construction set from ports with some merges from current

src/scripts any tcptest script

src/scripts/fastners any script to call others in order to make it fast

src/scripts/tests any unittest script (conformance or regression test)

tcpconnect.py This script make three way handshake(3wh), it's a raw one-method script. It was the first functional file, made to understand the tcp/ip 3wh and connection finalization. Serveral prints on screen for a better following of packet exchanged.

fasteners/tcpconnect.sh Calls tcpconnect with args.

tests/cthreewayhandshake_nooptions.py tcpconnect.py adapted to unittest. Code was refactured, removed duplicated code, several methods acting as utils created.

tests/c3waywithoutoptions.py first script using tcptest.py. Now code calls tcptest module, more readable and mature code.

tests/tcptest.py tcptest module. (detailed in the next section)

tests/csynbroadcast.py Sends a syn to ip broadcast addr, but to a specific MAC.

tests/cresetfromclosedstate.py Establish a conn, set DUT to make active close, wait 2MSL, and inject syn with the same finalized sequence number. rst and fin are also tested.

tests/cresetFromNonSyncState.py resetTcp created. tcptest.threewayhandshakenoopt created. (a)Make 3wh and then sends an out of window ack. (b)with connection established start active close and then sends an out of window ack

tests/cresetFromSyncState.py (a)Send an out of order acknowledgment, without any previous messages. (b)send an out of order acknowledgment at SYN_RECEIVE DUT's status.

assertAcknowledgmentPresent assert that ack_number is different from None and greater then 0.

assertSequencePresent assert that sequence is different from None and greater then 0.

assertExpectedSequence assert receive segments carries the expected sequence number.

assertExpectedAcknowledgment assert receive segments carries the expected ack_number.

assertSequenceAcknowledgmentOK calls assertAcknowledgmentPresent, assertSequencePresent, assertExpectedSequence, assertExpectedAcknowledgment

assertSynPresent assert syn bit is set.

assertReset assert rst bit is set.

assertFin assert fin bit is set.

createip create ip packet. Using tcb this method set all basic ip attributes automatically.

createtcp create tcp segment (called by createip). Using tcb this method set all basic tcp attributes automatically.

createethernet create ethernet frame.

createwritepacket Calls (a)createethernet, set ip to ethernet packet and write bytes to network device.

receive Receive packet for specific tcb.

createsyn Calls create ip then set syn flag.

createfin Calls create ip then set fin flag.

createrstfromreceivedtcp Create and reset segment according rfc.

createfakerstfromtcb Resets a not received segment.

createoutofwindowack Create an ack out of current window.

threewayhandshakenoopt Calls createsyn, createwritepacket(syn sent), receive(ack+syn), createip(ack)

closeconnection Sends a fin, expect ack+fin(together or not) then send ack

passivecloseconnection Expect a fin, send ack+fin and expect an ack.

tcp_cksum Calcs tcp check sum

ip_cksum Calcs ip check sum

3wh - Three way handshake

DUT - Device Under Test

Testing Station - where the tests are executed