From 34a0deac629a631fa8f6b39370e84a09716d6af6 Mon Sep 17 00:00:00 2001
From: Sapan Bhatia <sapanb@cs.princeton.edu>
Date: Mon, 28 Jul 2008 05:25:32 +0000
Subject: [PATCH] Check that vnet properly receives SYN/ACK packets

---
 qaapi/qa/tests/node/synacks.pl | 81 ++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100755 qaapi/qa/tests/node/synacks.pl

diff --git a/qaapi/qa/tests/node/synacks.pl b/qaapi/qa/tests/node/synacks.pl
new file mode 100755
index 0000000..aa57c96
--- /dev/null
+++ b/qaapi/qa/tests/node/synacks.pl
@@ -0,0 +1,81 @@
+#!/usr/bin/perl
+# Generate a ton of connections and check if we can see syn/ack packets via tcpdump
+
+use strict;
+use IO::Socket;
+use threads;
+use threads::shared;
+
+my $guineapig='www.cs.princeton.edu';
+my $targetfile='/~sapanb/small';
+my $magic='3j4kl;1234kj341234jl1k234ljk123h4';
+my $numiter=1000;
+my $numsynacks:shared=0;
+my $numthreads=4;
+my $numpackets=$numthreads*$numiter;
+
+sub fetch {
+	my $sock = new IO::Socket::INET (
+		PeerAddr => $guineapig,
+		PeerPort => 80,
+		Proto => 'tcp'
+	);
+	return 0 unless $sock;
+	print $sock "GET $targetfile HTTP/1.0\r\n";
+	print $sock "Host: www.cs.princeton.edu\r\n";
+	print $sock "\r\n";
+
+	my $success=0;
+	while (<$sock>) {
+		if (/$magic/g) {
+			$success=1;
+			last;
+		}
+	}
+	close ($sock);
+	if ($success==1) {
+		$numsynacks=$numsynacks+1;
+	}
+	return $success;
+}
+
+sub mfetch {
+	foreach (1..$numiter) {
+		fetch;
+	}
+}
+
+sub launch {
+	my @tarray;
+	foreach (1..$numthreads) {
+		my $thr = threads->create(\&mfetch);
+		push @tarray,$thr;
+	}
+
+	for (@tarray) {
+		$_->join;
+	}
+}
+
+sub open_tcpdump {
+	my $filter="'tcp[tcpflags]&tcp-syn !=0 and tcp[tcpflags]&tcp-ack !=0 and src $guineapig'";
+	my $cmdline="/usr/sbin/tcpdump -c $numpackets $filter";
+	my $p;
+	
+	system($cmdline);
+}
+
+sub alhandler {
+	print "[FAILED] tcpdump apparently did not intercept all SYN/ACK packets\n";
+	exit(-1);
+}
+
+print "Starting tcpdump...\n";
+my $tcpdthr=threads->create(\&open_tcpdump);
+sleep 10;
+print "Generating connections...\n";
+launch;
+$SIG{ALRM}=\&alhandler;
+alarm(60);
+$tcpdthr.join;
+print "[SUCCESS] Test completed OK. $numsynacks SYN/ACK packets intercepted.\n";
-- 
2.43.0