sintax error at xxxx.pl line 30, near "}"
Coloreado en 0.000 segundos, usando GeSHi 1.0.8.4
Using text Syntax Highlighting
sintax error at xxxx.pl line 23, near "=)"
sintax error at xxxx.pl line 30, near "}"
sintax error at xxxx.pl line 30, near "}"
El típico error de sintaxis... aquí está el script...
Using perl Syntax Highlighting
- # For BIND9 v9.2.3-9.4.1:
- $tap1=0x80000057;
- $tap2=0x80000062;
- # For BIND9 v9.0.0-9.2.2:
- # $tap1=0xc000002b; # (0x80000057>>1)|(1<<31)
- # $tap2=0xc0000061; # (0x800000c2>>1)|(1<<31)
- $initial_guess_bits=6;
- @cand_lfsr1=();
- @cand_lfsr2=();
- use Time::HiRes qw(gettimeofday);
- @txid=();
- # Read all data from file. It is assumed to be in the format generated
- # by the XSL transformation described in appendix A.
- $count=0;
- open(FD,$ARGV[0]) or die "ERROR: Can't open file $ARGV[0]";
- while(my $line=)
- {
- # File format: TXID[4 hex] (ignore everything beyond those 4 digits)
- if ($line=~/^([0-9a-fA-F]{4})/x)
- {
- push @txid,hex($1);
- $count++;
- }
- else
- {
- die "ERROR: Can't parse line at count=$count.\n";
- }
- }
- close(FD);
- print "INFO: Found $count DNS queries in file.\n";
- sub next_trxid
- {
- my ($lfsr1,$lfsr2)=@_;
- my $val;
- for (my $i=0;$i<$count+1;$i++)
- {
- $val=($lfsr1^$lfsr2) & 0xFFFF;
- $skip1=$lfsr1 & 1;
- $skip2=$lfsr2 & 1;
- for (my $j1=0;$j1<=$skip2;$j1++)
- {
- $lfsr1 = ($lfsr1>>1) ^ (($lfsr1 & 1)*$tap1);
- }
- for (my $j2=0;$j2<=$skip1;$j2++)
- {
- $lfsr2 = ($lfsr2>>1) ^ (($lfsr2 & 1)*$tap2);
- }
- #printf "%04x ",$val;
- }
- return $val;
- }
- sub verify
- {
- my ($lfsr1,$width1,$lfsr2,$width2)=@_;
- for (my $i=0;$i<$count;$i++)
- {
- my $cand=($lfsr1^$lfsr2) & 0xFFFF;
- my $min_width=($width1<=$width2) ? $width1 : $width2;
- $min_width=($min_width<=16) ? $min_width : 16;
- if ($min_width<=0)
- {
- return 1;
- }
- my $mask=(1<<$min_width)-1;
- if (($cand & $mask) != ($txid[$i] & $mask))
- {
- return 0;
- }
- $skip1=$lfsr1 & 1;
- $skip2=$lfsr2 & 1;
- for (my $j1=0;$j1<=$skip2;$j1++)
- {
- $lfsr1 = ($lfsr1>>1) ^ (($lfsr1 & 1)*$tap1);
- if ($width1<32)
- {
- $width1--;
- }
- }
- for (my $j2=0;$j2<=$skip1;$j2++)
- {
- $lfsr2 = ($lfsr2>>1) ^ (($lfsr2 & 1)*$tap2);
- if ($width2<32)
- {
- $width2--;
- }
- }
- }
- return 1;
- }
- sub phase2
- {
- my ($lfsr1,$width1,$lfsr2,$width2)=@_;
- my $motion_detected=0;
- if ($width1<32)
- {
- my $guess_0=verify($lfsr1|(0<<$width1),$width1+1,$lfsr2,$width2);
- my $guess_1=verify($lfsr1|(1<<$width1),$width1+1,$lfsr2,$width2);
- if ($guess_0 ^ $guess_1)
- {
- #Exactly one is correct. So we know the bit.
- $motion_detected=1;
- if ($guess_1)
- {
- $lfsr1=$lfsr1|(1<<$width1);
- }
- $width1++;
- }
- elsif ((!$guess_0) and (!$guess_1))
- {
- # Inconsistent state, hence wrong guess in the first place
- return 0;
- }
- }
- if ($width2<32)
- {
- my $guess_0=verify($lfsr1,$width1,$lfsr2|(0<<$width2),$width2+1);
- my $guess_1=verify($lfsr1,$width1,$lfsr2|(1<<$width2),$width2+1);
- if ($guess_0 ^ $guess_1)
- {
- #Exactly one is correct. So we know the bit.
- $motion_detected=1;
- if ($guess_1)
- {
- $lfsr2=$lfsr2|(1<<$width2);
- }
- $width2++;
- }
- elsif ((!$guess_0) and (!$guess_1))
- {
- # Inconsistent state, hence wrong guess in the first place
- return 0;
- }
- }
- if (($width1==32) and ($width2==32))
- {
- # Final verification
- if (verify($lfsr1,32,$lfsr2,32))
- {
- push @cand_lfsr1,$lfsr1;
- push @cand_lfsr2,$lfsr2;
- return 1;
- }
- else
- {
- # false alarm
- return 0;
- }
- }
- if ($motion_detected)
- {
- # At least one width was improved.
- return phase2($lfsr1,$width1,$lfsr2,$width2);
- }
- else
- {
- # Resort to bit guessing.
- if ($width1<32)
- {
- # Guessing another bit in LFSR1 and continuing...
- return
- phase2($lfsr1|(0<<$width1),$width1+1,$lfsr2,$width2)+
- phase2($lfsr1|(1<<$width1),$width1+1,$lfsr2,$width2);
- }
- else
- {
- # Guessing another bit in LFSR2 and continuing...
- return
- phase2($lfsr1,$width1,$lfsr2|(0<<$width2),$width2+1)+
- phase2($lfsr1,$width1,$lfsr2|(1<<$width2),$width2+1);
- }
- }
- }
- my $start_time=gettimeofday();
- my $good=0;
- for (my $lfsr1=0;$lfsr1<(1<<$initial_guess_bits);$lfsr1++)
- {
- my $lfsr2=($txid[0]^$lfsr1) & ((1<<$initial_guess_bits)-1);
- if (verify($lfsr1,$initial_guess_bits,$lfsr2,$initial_guess_bits))
- {
- $good+=
- phase2($lfsr1,$initial_guess_bits,$lfsr2,$initial_guess_bits);
- }
- }
- my $end_time=gettimeofday();
- print "INFO: ".$good." candidates found:\n";
- for (my $k=0;$k<$good;$k++)
- {
- printf "*** LFSR1=0x%08x LFSR2=0x%08x Next_TRXID=0x%04x ***\n",
- $cand_lfsr1[$k],$cand_lfsr2[$k],
- next_trxid($cand_lfsr1[$k],$cand_lfsr2[$k]);
- }
- print "INFO: Elapsed time: ".($end_time-$start_time)." seconds\n";
- exit(0);
Coloreado en 0.008 segundos, usando GeSHi 1.0.8.4
Si alguien puede corregirlo o al menos darme una idea se lo agradecería...
Gracias de antemano...
