forked from pool/tcpdump
81 lines
2.4 KiB
Perl
81 lines
2.4 KiB
Perl
#!/usr/bin/perl
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# (C)2002 by IBM Corporation, published under terms of the GPL V2
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# Author: Holger Smolinski <smolinsk@de.ibm.com>
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# this file is a wrapper around tcpdump, which provides the capability
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# for debugging qeth and/or HiperSocket(TM) network interfaces under
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# Linux for S/390 and zSeries. tcpdump Syntax is preserved.
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# Bugs: When the input pipe ends the process is not stopped.
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use Getopt::Std;
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my $incmd,$outcmd;
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getopts ("adeflnNOpqRStuvxXc:C:F:i:m:r:s:T:w:E:",\%options);
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# Check which options to replace for the reader process
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if ( defined($options{'r'}) ) {
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$incmd = "cat $options{'r'}";
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$filter_out = 1;
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} else {
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$incmd = "tcpdump -l -w -";
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$filter_out = 0;
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if ( defined($options{'i'}) ) {
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$incmd .= " -i ".$options{'i'};
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delete $options{'i'}; # remove -i option from option list
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}
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foreach $key (@ARGV) {
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$incmd .= " $key";
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}
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}
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$outcmd = "tcpdump -r -";
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# Rebuild arglist for the writer process
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delete $options{'r'}; # remove -r option from option list
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foreach $key (keys %options) {
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if ((index "adeflnNOpqRStuvxX",$key) >= 0 ) {
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$outcmd .= " -$key";
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} else {
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$outcmd .= " -$key $options{$key}";
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}
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if ( $filter_out == 1 ) {
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foreach $key (@ARGV) {
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$outcmd .= " $key";
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}
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}
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}
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open READER,"$incmd|" or die "Cannot spawn reader command $incmd";
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open WRITER,"|$outcmd" or die "Cannot spawn writer command $outcmd";
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sysread READER,$filehdr,24 or die "Cannot read file header";
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($magic,$version_major,$version_minor,$thiszone,$sigfigs,$snaplen,$linktype) =
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unpack("ISSIIII",$filehdr);
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$snaplen += 14;
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$filehdr = pack ("ISSIIII",($magic,$version_major,$version_minor,$thiszone,$sigfigs,$snaplen,$linktype));
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syswrite WRITER,$filehdr,24;
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$etherheaderip6 = pack ("IIIS",(0,0,0,0x8dd));
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$etherheaderip4 = pack ("IIIS",(0,0,0,0x800));
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while ( 1 ) {
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$hdrd = 0;
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do {$hdrd += sysread READER, $pkthdr, 16-$hdrd, $hdrd; } while ($hdrd < 16);
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($seconds,$usecs,$caplen,$len) = unpack ("IIII",$pkthdr);
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$hdrd = 0;
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do {$hdrd += sysread READER, $packet,$caplen-$hdrd, $hdrd; } while ($hdrd < $caplen);
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$paktype = unpack("C",$packet);
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if ( $paktype & 0xf0 == 0x60 ) {
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$caplen += 14;
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$len += 14;
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$header = $etehrheaderip6;
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} elsif ($paktype >= 0x45 && $paktype <= 0x4f ) {
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$caplen += 14;
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$len += 14;
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$header = $etherheaderip4;
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} else {
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$header = "";
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}
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$pkthdr = pack ("IIII",($seconds,$usecs,$caplen,$len));
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syswrite WRITER,"$pkthdr$header$packet",16+$caplen;
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}
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