#!/usr/local/bin/perl
#
## Copyright (C) 1996-2022 The Squid Software Foundation and contributors
##
## Squid software is distributed under GPLv2+ license and includes
## contributions from numerous individuals and organizations.
## Please see the COPYING and CONTRIBUTORS files for details.
##

# udp-banger.pl
#
# Duane Wessels, Dec 1995
#
# Usage: udp-banger.pl [host [port]] < url-list
#
# Sends a continuous stream of ICP queries to a cache.  Stdin is a list of
# URLs to request.  Run N of these at the same time to simulate a heavy
# neighbor cache load.

use Fcntl;
use Getopt::Std;
use IO::Socket;

$|=1;

getopts('qlnr');

$host=(shift || 'localhost') ;
$port=(shift || '3130') ;

# just copy this from src/proto.c
@CODES=(
    "ICP_INVALID",
    "ICP_QUERY",
    "UDP_HIT",
    "UDP_MISS",
    "ICP_ERR",
    "ICP_SEND",
    "ICP_SENDA",
    "ICP_DATABEG",
    "ICP_DATA",
    "ICP_DATAEND",
    "ICP_SECHO",
    "ICP_DECHO",
    "ICP_OP_UNUSED0",
    "ICP_OP_UNUSED1",
    "ICP_OP_UNUSED2",
    "ICP_OP_UNUSED3",
    "ICP_OP_UNUSED4",
    "ICP_OP_UNUSED5",
    "ICP_OP_UNUSED6",
    "ICP_OP_UNUSED7",
    "ICP_OP_UNUSED8",
    "UDP_RELOADING",
    "UDP_DENIED",
    "UDP_HIT_OBJ",
    "ICP_END"
    );

$sock = IO::Socket::INET->new(PeerAddr => "$host:$port", Proto => 'udp');
die "socket: $!\n" unless defined($sock);

chop($me=`uname -a|cut -f2 -d' '`);
$myip=(gethostbyname($me))[4];

$flags = fcntl ($sock, &F_GETFL, 0);
$flags |= &O_NONBLOCK;
die "fcntl O_NONBLOCK: $!\n" unless
    fcntl ($sock, &F_SETFL, $flags);

$flags = 0;
$flags |= 0x80000000;
$flags |= 0x40000000 if ($opt_n);
$flags = ~0;
$rn = 0;

$start = time;
while (<>) {
    chop;

    if ($opt_l) { # it's a Squid log file
        @stuff = split(/\s+/, $_);
        $_ = $stuff[6];
    }

    $len = length($_) + 1;
    $request_template = sprintf 'CCnNNa4a4x4a%d', $len;
    $request = pack($request_template,
        1,              # C opcode
        2,              # C version
        24 + $len,      # n length
        ++$rn,          # N reqnum
        $flags,         # N flags
        '',             # a4 pad
        $myip,          # a4 shostid
        $_);            # a%d payload
    die "send: $!\n" unless
        send($sock, $request, 0);
    $nsent++;
    $rin = '';
    vec($rin,fileno($sock),1) = 1;
    ($nfound,$timeleft) = select($rout=$rin, undef, undef, 2.0);
    next if ($nfound == 0);
    while (1) {
        last unless ($theiraddr = recv($sock, $reply, 1024, 0));
        next if $opt_q; # quietly carry on
        $nrecv++;
        if ($opt_r) {
            # only print send/receive rates
            if (($nsent & 0xFF) == 0) {
                $dt = time - $start;
                printf "SENT %d %f/sec; RECV %d %f/sec\n",
                    $nsent,
                    $nsent / $dt,
                    $nrecv,
                    $nrecv / $dt;
            }
        } else {
            # print the whole reply
            ($junk, $junk, $sourceaddr, $junk) = unpack($sockaddr, $theiraddr);
            @theirip = unpack('C4', $sourceaddr);
            ($type,$ver,$len,$flag,$p1,$p2,$payload) = unpack('CCnx4Nnnx4A', $reply);
            print join('.', @theirip) . ' ' . $CODES[$type] . " $_";
            print " hop=$p1" if ($opt_n);
            print " rtt=$p2" if ($opt_n);
            print "\n";
        }
    }
}

