76 lines
2.1 KiB
Perl
Executable File
76 lines
2.1 KiB
Perl
Executable File
#!/usr/bin/env perl
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#
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# Copyright (C) 2001-2021 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-sendmail.pl
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#
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# A sendmail/emailrelay shim. Typically installed as /usr/sbin/sendmail or
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# /usr/lib/sendmail.
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#
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use strict ;
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use FileHandle ;
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use Getopt::Std ;
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my $exe = "/usr/sbin/emailrelay-submit" ;
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# parse and mostly ignore sendmail command-line options
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my $usage = "usage: emailrelay-sendmail [-intUv] [-ABbCDdFfGhiLNnOopqRrtUVvX <arg>] [-f <from>] <to> [<to> ...]" ;
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my %opt = () ;
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getopts( 'A:B:b:C:D:d:F:f:Gh:iL:N:nO:o:p:q:R:r:tUV:vX:' , \%opt ) or die "$usage\n" ;
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my $from = defined($opt{f}) ? $opt{f} : $ENV{USER} ;
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my @submit_args = ( "--content-date" , @ARGV ) ; # also consider using "--copy"
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# if "-t" read envelope 'to' addresses from content headers
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if( $opt{t} )
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{
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# read content headers
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my %h = () ;
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my @h = () ;
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my $k = "" ;
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while(<STDIN>)
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{
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chomp( my $line = $_ ) ;
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$line =~ s/\r$// ;
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last if ( $line eq "" ) ;
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my ( $a , $b , $c , $d ) = ( $line =~ m/^(\S*):\s*(.*)|^(\s)(.*)/ ) ;
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if( $a ) { $k = lc($a) ; $h{$k} = $b }
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if( $k && $d ) { $h{$k} .= "$c$d" } # folding
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push @h , $line unless ( lc($k) eq 'bcc' ) ; # remove Bcc
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}
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# extract 'to' addresses
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my @to = () ;
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push @to , split(" ",$h{to}) if exists($h{to}) ;
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push @to , split(" ",$h{cc}) if exists($h{cc}) ;
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push @to , split(" ",$h{bcc}) if exists($h{bcc}) ;
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# write headers and copy body into temp file
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my $tmp = "/tmp/emailrelay-sendmail.$$.tmp" ;
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my $fh = new FileHandle( $tmp , "w" ) or die ;
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map { print $fh $_ , "\r\n" } @h ;
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print $fh "\r\n" ;
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while(<STDIN>) { print $fh $_ }
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$fh->close() or die ;
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# make stdin read from the temp file
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open STDIN , '<' , $tmp or die ;
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unlink $tmp or die ;
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# run emailrelay-submit
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my @args = ( $exe , "-f" , $from , @to ) ;
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exec { $exe } @args ;
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}
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else
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{
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# run emailrelay-submit
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my @args = ( $exe , "-f" , $from , @submit_args ) ;
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exec { $exe } @args ;
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}
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