#!/usr/bin/perl
use strict;
use warnings;
use Getopt::Long qw(:config posix_default bundling);
use Net::Pcap qw(:functions);
# use private include path based on script path
BEGIN {
my $bin = __FILE__;
$bin = readlink($bin) while ( -l $bin );
unshift @INC, $bin =~m{^(.*?)(?:\.\w+)?$};
}
use Net::Inspect::L2::Pcap;
use Net::Inspect::L3::IP;
use Net::Inspect::L4::TCP;
use Net::Inspect::L5::GuessProtocol;
use Net::Inspect::L7::HTTP;
use Net::Inspect::L5::NoData;
use Net::Inspect::L5::Unknown;
use Net::Inspect::L5::Socks;
use Net::Inspect::Debug qw(:DEFAULT %TRACE $DEBUG);
use privHTTPConn;
use privHTTPRequest;
use privFileCache;
# ----------------------------------------------------------------------------
# usage and options parsing
# ----------------------------------------------------------------------------
my (@infile,$dev,$nopromisc,@trace,$outdir,$verbose,$anon_stats);
my $uncompress = my $unchunk = 1;
my $usage = sub {
print STDERR "ERROR: @_\n" if @_;
print STDERR <<USAGE;
reads data from pcap file or device and analyzes it.
Right now it will collect tcp streams which look like http and extract
requests and responses. Transfer encoding of chunked and content encoding
of gzip/deflate will be transparently removed.
Usage: $0 [options] [pcap-filter]
Options:
-h|--help this help
## input
-i dev read pcap from dev
-p do net set dev into promisc mode
-r file.pcap read pcap from file, use stdin if not given and no dev
more then one file can be given by using option multiple
times
## output
-v|--verbose print information about each request (implied if no outdir
and no anon-stats)
--anon-stats output anonymous stats for generating benchmarks
-D dir extract data into dir, right now only for http requests
and responses. If not given prints info to stdout
--unchunk do unchunking if saving (default)
--nounchunk no unchunking if saving
--uncompress do uncompression if saving (default), implies unchunking
--nouncompress no uncompression if saving
## debugging
-d|--debug various debug messages are shown
-T trace trace messages are enabled in the modules, option can
be given multiple times, trace is last part of module name,
e.g. tcp, rawip, http,...
To enable all specify '*'
USAGE
exit(2);
};
GetOptions(
'h|help' => sub { $usage->() },
# input
'i=s' => \$dev,
'p' => \$nopromisc,
'r=s' => \@infile,
# output
'v|verbose' => \$verbose,
'D|dir=s' => \$outdir,
'uncompress!' => \$uncompress,
'unchunk!' => \$unchunk,
'anon-stats' => \$anon_stats,
# debug
'd|debug' => \$DEBUG,
'T|trace=s' => sub { push @trace, split(m/,/, $_[1]) },
) or $usage->();
$usage->('only interface or file can be set') if @infile and $dev;
$infile[0] = '/dev/stdin' if ! $dev and ! @infile;
$verbose = 1 if ! $outdir && ! $anon_stats;
my $pcapfilter = join(' ',@ARGV);
$TRACE{$_} = 1 for(@trace);
die "cannot write to $outdir: $!" if $outdir and ! -w $outdir || ! -d _;
# ----------------------------------------------------------------------------
# process files
# ----------------------------------------------------------------------------
for my $infile (@infile ? @infile : undef ) {
# ------------------------------------------------------------------------
# open pcap
# ------------------------------------------------------------------------
my $err;
my $pcap = $infile
? pcap_open_offline($infile,\$err)
: pcap_open_live($dev,2**16,!$nopromisc,0,\$err);
$pcap or die $err;
if ( $pcapfilter ) {
pcap_compile($pcap, \(my $compiled), $pcapfilter,0,0xffffffff) == 0
or die "bad filter '$pcapfilter'";
pcap_setfilter($pcap,$compiled) == 0 or die "pcap_setfilter failed";
}
# ------------------------------------------------------------------------
# setup parse hierarchy
# ------------------------------------------------------------------------
my $guess = Net::Inspect::L5::GuessProtocol->new;
my $tcp = Net::Inspect::L4::TCP->new($guess);
my $raw = Net::Inspect::L3::IP->new($tcp);
my $pc = Net::Inspect::L2::Pcap->new($pcap,$raw);
my $http_request = privHTTPRequest->new(
! $outdir ? (): (
dir => $outdir,
fcache => privFileCache->new(128)
),
! ( $verbose || $anon_stats ) ? () : (
info => \&info,
),
);
if ( $outdir ) {
my %opt = ( '-original-header-prefix' => 'X-Original-' );
$http_request->add_hooks( %opt,'unchunk') if $unchunk || $uncompress;
$http_request->add_hooks( %opt,'uncompress_te','uncompress_ce') if $uncompress;
}
my $http_conn = privHTTPConn->new($http_request);
my $null = Net::Inspect::L5::NoData->new();
my $fallback = Net::Inspect::L5::Unknown->new();
$guess->attach($http_conn);
$guess->attach($null);
$guess->attach($fallback);
# detect socks encapsulation
my $guess2 = Net::Inspect::L5::GuessProtocol->new;
my $socks = Net::Inspect::L5::Socks->new($guess2);
$guess2->attach($http_conn);
$guess2->attach($null);
$guess2->attach($fallback);
$guess->attach($socks);
# ------------------------------------------------------------------------
# pcap loop
# ------------------------------------------------------------------------
my $time;
pcap_loop($pcap,-1,sub {
my (undef,$hdr,$data) = @_;
if ( ! $time || $hdr->{tv_sec}-$time>10 ) {
$tcp->expire($time = $hdr->{tv_sec});
}
return $pc->pktin($data,$hdr);
},undef);
}
# ----------------------------------------------------------------------------
# verbose/anon-stats
# ----------------------------------------------------------------------------
my $basetime;
sub info {
my ($line,$d) = @_;
print "$line\n" if $verbose;
if ( $anon_stats ) {
$basetime ||= $d->{meta}{time};
my $ct = $d->{resp}->header('content-type') || '?';
$ct =~s/;.*//;
my $ce = $d->{resp}->header('content-encoding');
printf("%7.2f %6.2f %05d.%04d %s/%s%s stat:%d,%d,%d,%d%s%s\n",
$d->{meta}{time} - $basetime,
$d->{stat}{duration},
$d->{flowid}, $d->{reqid},
$d->{method},
$d->{resp}->code,
$d->{stat}{rpbody} ? " ct:$ct" : '',
$d->{stat}{rqhdr}, $d->{stat}{rqbody},
$d->{stat}{rphdr}, $d->{stat}{rpbody},
$d->{stat}{chunks} ? " chunks:$d->{stat}{chunks}" :'',
$ce ? " ce:$ce":''
);
}
}