86 lines
2.4 KiB
Perl
Executable File
86 lines
2.4 KiB
Perl
Executable File
#!/usr/bin/env perl
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#
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# Copyright (C) 2001-2023 Graeme Walker <graeme_walker@users.sourceforge.net>
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#
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# Copying and distribution of this file, with or without modification,
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# are permitted in any medium without royalty provided the copyright
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# notice and this notice are preserved. This file is offered as-is,
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# without any warranty.
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# ===
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#
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# emailrelay-rot13.pl
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#
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# An example E-MailRelay "--filter" script that does rot-13 masking.
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#
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use strict ;
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use FileHandle ;
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$SIG{__DIE__} = sub { (my $e = join(" ",@_)) =~ s/\n/ /g ; print "<<error: $e>>\n" ; exit 99 } ;
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my $content = $ARGV[0] ;
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my $content_tmp = "$content.tmp" ;
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my $fh_in = new FileHandle( $content , "r" ) or die "cannot open content file [$content]: $!\n" ;
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my $fh_out = new FileHandle( "$content_tmp" , "w" ) or die "cannot open temporary file [$content_tmp]: $!\n" ;
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my $boundary = "-----emailrelay-rot13-$$" ;
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my $in_header = 1 ;
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my @headers = () ;
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while(<$fh_in>)
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{
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chomp( my $line = $_ ) ;
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$line =~ s/\r$// ;
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if( $in_header && ( $line =~ m/^\s/ ) && scalar(@headers) ) # folding
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{
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$headers[-1] .= "\r\n$line" ;
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}
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elsif( $in_header && ( $line =~ m/^$/ ) )
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{
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$in_header = 0 ;
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for my $h ( @headers )
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{
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if( $h =~ m/^(subject|to|from):/i )
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{
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print $fh_out $h , "\r\n" ;
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}
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}
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print $fh_out "Content-Type: multipart/mixed; boundary=\"$boundary\"\r\n" ;
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print $fh_out "\r\n" ;
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print $fh_out "\r\n" ;
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print $fh_out "--$boundary\r\n" ;
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print $fh_out "Content-Type: text/plain; charset=us-ascii\r\n" ;
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print $fh_out "\r\n" ;
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print $fh_out "The original message has been masked...\r\n" ;
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print $fh_out "\r\n" ;
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print $fh_out "--$boundary\r\n" ;
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print $fh_out "Content-Type: text/plain\r\n" ;
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print $fh_out "Content-Transfer-Encoding: 8bit\r\n" ;
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print $fh_out "Content-Description: masked message\r\n" ;
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print $fh_out "\r\n" ;
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print $fh_out join( "\r\n" , map { rot13($_) } (@headers,"") ) ;
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}
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elsif( $in_header )
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{
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push @headers , $line ;
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}
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else
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{
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print $fh_out rot13($line) , "\r\n" ;
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}
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}
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print $fh_out "--$boundary--\r\n" ;
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print $fh_out "\r\n" ;
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$fh_in->close() or die ;
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$fh_out->close() or die "cannot write new file [$content_tmp]: $!\n" ;
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unlink( $content ) or die "cannot delete original file [$content]: $!\n" ;
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rename( $content_tmp , $content ) or die "cannot rename [$content_tmp]: $!\n" ;
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exit( 0 ) ;
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sub rot13
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{
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my ( $s ) = @_ ;
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$s =~ tr/[a-m][n-z][A-M][N-Z]/[n-z][a-m][N-Z][A-M]/ ;
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return $s ;
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}
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