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Old 06-30-2005, 12:54 PM   #1
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Registered: Jun 2005
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Perl-CGI 500 Error


I am a newbie to Linux and I am trying to get the cgi script below to run on my Linux box. I have tried to get it working on RH 9 and also Suse 9.3 both have the same error 500 internal error. I know I must be missing something I have installed CGI.PM and also file::temp but have no idea what else this cgi needs. I looked at the common things like chmod'ing it to 755 and also unpacked it from the box and copied the cgi to the cgi-bin directory.

I am able to run outher cgi and pl scripts so just think I am missing some files somewhere. When I ran perl -wc BBCorrectorServer.cgi it said something about lines 31 and also line 40. I don't think it is an error in the script because others are running it fine.

If anyone has any ideas please let me know


# BBCorrector Server
# This script accepts a block of text from the BlackBerry software
# BBCorrector, runs it through Aspell, and returns an XML packet
# indicating spelling errors.
# - It is recommended you protect this script with some form of HTTP
# authentication. BBCorrector is setup to handle Basic Authentication.
use CGI qw(:standard Vars);
use File::Temp qw/ tempfile tempdir /;

# The Aspell executable
my $cmdAspellExe = "aspell";

# Language is US English
my $lang = "en_US";

# Options for Aspell. Puts Aspell into Ispell compatibility mode
# so that its output is written to stdout
my $cmdAspellOptions = "-a --lang=$lang";

my %FORM = Vars();

# Get the block of text from the HTTP parameter "check"
my $text2Check = "$FORM{check}";

# Convert line endings to a common format. In this case whatever
# line ending combination we get (CRLF, LF, etc), we convert to a standard
# format of LF
$text2Check =~ s/\x0D\x0A|\r/\n/g;

# Create a temporary file to store our block of text
my $dirTemp = tempdir( CLEANUP => 1 );
my( $tempHandle, $tempFilename ) = tempfile( DIR => $dir );

# Split block of text into lines and write to temp file
@lines = split( /\n/, $text2Check );
for my $line ( @lines ) {
# Force Aspell to check whole line via ^ contol character
print $tempHandle "^$line\n";
close $tempHandle;

# XML packet has format such as:
# <spell-results>
# <error>
# <word>maan</word>
# <position>12</position>
# <suggest>Man</suggest>
# <suggest>man</suggest>
# <suggest>moan</suggest>
# </error>
# <error>
# <word>helllo</word>
# <position>33</position>
# <suggest>hello</suggest>
# </error>
# <error>
# <word>chris</word>
# <position>41</position>
# <suggest>Chris</suggest>
# <suggest>Charis</suggest>
# </error>
# </spell-results>
my $xmlPacket = "<spell-results>";

# Do this here so that when we are debugging we can display it in return output
print header;

# Keeps track of current line number
my $lineNum = 0;

# Keeps track of the absolute position in the block of text
my $posAbsolute = 0;

# Execute Aspell
my $cmd = "$cmdAspellExe $cmdAspellOptions < $tempFilename 2>&1";
# TODO: $status most likely only tracks wether the fork failed or not, not
# whether the actual command we are running (ie: aspell) failed
my $status = open ASPELL, "$cmd |";

if ($status > 0) {
# Parse Aspell output
for my $cmdReturn (<ASPELL>) {
#print "$cmdReturn<br>\n";

if( $cmdReturn =~ /^\*/ ) {
# Line begins with *. Do nothing.

} elsif( $cmdReturn =~ /^(&|#)/ ) {
# Line begins with & or #.

# Start error element
$xmlPacket .= "<error>";

# Split return line up for easier access
my @tokens = split(" ", $cmdReturn, 5);

# Add word element which contains original misspelled word
$xmlPacket .= "<word>$tokens[1]</word>";

# Need to work out absolute position in file, not just position in current line
my $offsetIdx = 3;
if ($cmdReturn =~ /^\#/) {
my $pos = $posAbsolute + ($tokens[$offsetIdx] - 1);
$xmlPacket .= "<position>".$pos."</position>";

# Add suggestions
my @suggestions = ();
if ($tokens[4]) {
@suggestions = split(", ", $tokens[4]);
for my $suggestion (@suggestions) {
$xmlPacket .= "<suggest>$suggestion</suggest>";

# End error element
$xmlPacket .= "</error>";

} elsif( $cmdReturn =~ /^$/ ) {
# We have a blank line which indicates a line of text has been processed

my $line = $lines[$lineNum];
$posAbsolute += (length($line) + 1);
close ASPELL;

} else {
$xmlPacket .= "<exception>BBCorrector Server has encountered an error ($!)</exception>";

# Delete the temp file
unlink $tempFilename;

# End results XML packet
$xmlPacket .= "</spell-results>";

#print "check = $text2Check<p>\n";

# Return XML packet back to client
print "$xmlPacket\n";
Old 07-01-2005, 03:45 AM   #2
Registered: Aug 2004
Location: Sydney
Distribution: Centos 6.6, Centos 5.10
Posts: 16,352

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Please post the error msgs...


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