2 # Generate a ton of connections and check if we can see syn/ack packets via tcpdump
9 my $guineapig='www.cs.princeton.edu';
10 my $targetfile='/~sapanb/small';
11 my $magic='3j4kl;1234kj341234jl1k234ljk123h4';
13 my $numsynacks:shared=0;
15 my $numpackets=$numthreads*$numiter;
18 my $sock = new IO::Socket::INET (
19 PeerAddr => $guineapig,
23 return 0 unless $sock;
24 print $sock "GET $targetfile HTTP/1.0\r\n";
25 print $sock "Host: www.cs.princeton.edu\r\n";
37 $numsynacks=$numsynacks+1;
43 foreach (1..$numiter) {
50 foreach (1..$numthreads) {
51 my $thr = threads->create(\&mfetch);
61 my $filter="'tcp[tcpflags]&tcp-syn !=0 and tcp[tcpflags]&tcp-ack !=0 and src $guineapig'";
62 my $cmdline="/usr/sbin/tcpdump -c $numpackets $filter";
69 print "[FAILED] tcpdump apparently did not intercept all SYN/ACK packets\n";
73 print "Starting tcpdump...\n";
74 my $tcpdthr=threads->create(\&open_tcpdump);
76 print "Generating connections...\n";
78 $SIG{ALRM}=\&alhandler;
81 print "[SUCCESS] Test completed OK. $numsynacks SYN/ACK packets intercepted.\n";