CS144: Introduction to Computer Networking Fall 2021
2 Getting started
Your implementation of a
TCPConnection
will use the same Sponge library that you used
in Labs 0–3, with additional classes and tests. We’re giving you support code that reads
and writes TCP segments into the payloads of user and Internet datagrams. We’re also
giving you a class (
CS144TCPSocket
) that wraps your
TCPConnection
and makes it behave
like a normal stream socket, just like the
TCPSocket
you used to implement
webget
back
in Lab 0. By the end of this lab, you will slightly modify your
webget
to use your TCP
implementation—a CS144TCPSocket instead of a TCPSocket. To get started:
1.
Make sure you have committed all your solutions to Lab 3. Please don’t modify any
files outside the top level of the
libsponge
directory, or
webget.cc
. You may have
trouble merging the Lab 4 starter code otherwise.
2.
While inside the repository for the lab assignments, run
git fetch
to retrieve the
most recent version of the lab assignments.
3.
Download the starter code for Lab 3 by running
git merge origin/lab4-startercode
.
4.
Within your
build
directory, compile the source code:
make
(you can run, e.g.,
make -j4 to use four processors when compiling).
5.
Outside the
build
directory, open and start editing the
writeups/lab4.md
file. This
is the template for your lab writeup and will be included in your submission.
3 Lab 4: The TCP connection
This week, you’ll finish building a working TCP implementation. You’ve already done most
of the work to get there: you’ve implemented the sender and the receiver. Your job this
week is to “wire them up” together into one object (a
TCPConnection
) and handle some
housekeeping tasks that are global to the connection.
Recall: TCP reliably conveys a pair of flow-controlled byte streams, one in each direction.
Two parties participate in the TCP connection, and each party acts as both “sender” (of its
own outbound byte-stream) and “receiver” (of an inbound byte-stream) at the same time:
TCPConnection
TCPConnection
TCPSender
TCPReceiver TCPSender
TCPReceiver
Ⓐ Ⓑ
“Hello there!”
“General Kenobi!”
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