#! /usr/bin/perl
# 
#	$Id$
# Copyright (C) 2002-2003 Jan Kratochvil <project-PerlMail@jankratochvil.net>
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


use vars qw($VERSION);
$VERSION=do { my @r=(q$Revision$=~/\d+/g); sprintf "%d.".("%03d"x$#r),@r; };
use strict;
use warnings;

use File::Basename;
use File::Spec::Link;
BEGIN {
	eval 'use lib $ENV{"PERLMAIL_BASEDIR"} || File::Basename::dirname(File::Spec::Link->resolve($0));';
	}
use PerlMail::Config;
use PerlMail::Lib;

require Getopt::Long;
use POSIX qw(WIFEXITED WEXITSTATUS WIFSIGNALED WTERMSIG WIFSTOPPED WSTOPSIG);
require MIME::Head;	# inherits Mail::Header
require Mail::Address;


sub sendmail_show { return "\"$sendmail_orig\" ".join(",",map("\"$_\"",@ARGV)); }

sub sendmail_orig_exec
{
	exec {$sendmail_orig} $0,@ARGV or die "exec(".sendmail_show()."): $!";
	die "NOTREACHED";
}

Getopt::Long::Configure(
		"no_ignorecase",
		"no_getopt_compat",
		"bundling",
		# FIXME: workaround: 'unknown options' are considered the same as 'arguments'
		# None of ($REQUIRE_ORDER, $PERMUTE, $RETURN_IN_ORDER) can help us.
		# No preprocessing possible as it is hard to find option arguments.
		"permute",
		"pass_through",
		);

my $opt_b;
my $opt_Q;
my $opt_q;
my $opt_t;
our $opt_f;	# not exported, just for local()
my $opt_perlmail_dry_run;
my @ARGV_save=@ARGV;	# for non-bm mode
die if !Getopt::Long::GetOptions(
		"b=s"              ,\$opt_b,
		"Q:s"              ,\$opt_Q,
		"q:s"              ,\$opt_q,
		"t"                ,\$opt_t,
		"f=s"              ,\$opt_f,
		"F=s"              ,\$opt_F,
		"perlmail-dry-run+",\$opt_perlmail_dry_run,
		);
if (0
		# RedHat sendmail-8.12.5-7/sendmail/main.c/\QDo a quick prescan of the argument list.\E
		|| grep({ File::Basename::basename($0) eq $_; } "newaliases","mailq","smtpd","hoststat","purgestat")
		# -bm: Deliver mail in the usual way (default).
		|| (defined($opt_b) && $opt_b ne "m")
		|| defined $opt_q	# MD_QUEUERUN
		|| defined $opt_Q	# MD_QUEUERUN
		) {
	@ARGV=@ARGV_save;
	sendmail_orig_exec();
	die "NOTREACHED";
	}

# RedHat sendmail-8.9.3-20/src/main.c/main()/\Qif (FullName != NULL)\E
#   for $opt_F is implemented by Mail::Address in our &FromAddress

my $head=MIME::Head->new(\*STDIN);
# options leave in @ARGV, addresses to @addr:
my @args=@ARGV;	# temporary
@ARGV=();	# options
my @addr=();	# addresses
push @{(/^-./ ? \@ARGV : \@addr)},$_ for (@args);
if ($opt_t) {
	for my $addrobj (map({ Mail::Address->parse($_); } map({ ($head->get($_)); } @h_rcpt))) {
		if (!$addrobj->address()) {
			# bogus, shouldn't happen
			warn "->address() not found in \"".$addrobj->format()."\"";
			next;
		}
		push @addr,$addrobj;
		}
	}

sub matches
{
	return 
}

my $from_headername;
{
	my $muttrc_From=parseone(scalar muttrc_get("from"));	# may get undef()!; parseone() may be redundant
	$muttrc_From=$muttrc_From->address() if $muttrc_From;
	$opt_f=undef() if defined($opt_f) && $muttrc_From && lc($opt_f) eq lc($muttrc_From);
	for (@h_from) {
		$from_headername=$_;	# leave last item in $from_headername
		next if !(my @from_val=$head->get($from_headername));
		@from_val=map({ ($_->address()); } map({ (Mail::Address->parse($_)); } @from_val));
		$from_headername=undef() if !(1==@from_val && $muttrc_From && lc($from_val[0]) eq lc($muttrc_From));
		last;
		}	# fallthru with $from_headername remaining set if last headername did not exist
	# now $from_headername contains the header name to be replaced w/substituted value
	}

# to be utilized later by &FromAddress
$is_pgp=(1
		&& do { local $_=$head->mime_attr("Content-Type");          $_ && ~m#^multipart/(?:signed|encrypted)$#; }
		&& do { local $_=$head->mime_attr("Content-Type.protocol"); $_ && ~m#^application/pgp\b#; }
		);

my $exitcode=0;
# !defined($rcpt) if we have no recipients
# make the list unique to prevent dupes being normally filtered by sendmail(8)
# one '{' is block-wrapper, another '{' is hash-indirection!
# hash keys are just strings, never refs!
# unify the list as Mail::Address instances
my @rcpts=(!@addr ? (undef()) : values(%{{ map({
		my $obj=$_;
		$obj=parseone $obj if !ref $obj;
		(!defined $obj ? () : (lc($obj->address())=>$obj));
		} @addr) }}));

my $stdin_body=(@rcpts<=1 ? undef() : do {	# store input data only if it will be used multiple times
		local $/=undef();
		<STDIN>;
		});
for my $rcpt (@rcpts) {
	local @ARGV=@ARGV;
	local $opt_f=$opt_f;

	if (defined $rcpt) {	# !defined($rcpt) if we have no recipients
		local $_;
		$opt_f=FromAddress($rcpt,1)->address() if !defined $opt_f;
		if ($from_headername) {
			if (my $fromaddr=FromAddress($rcpt,0)->format()) {
				$head->replace($from_headername,$fromaddr);
				}
			}
		}

	1;	# drop '-bm' if present as it is default anyway
	1;	# drop '-t' if present as we are looping now for it
	push @ARGV,"-f",$opt_f if defined $opt_f;
	# we don't handle "Full-Name" header thus pass "-F"
	# "From/Resent-From" should be handled by our &FromAddress
	push @ARGV,"-F",$opt_F if defined $opt_F;
	push @ARGV,$rcpt->address() if defined $rcpt;
	push @ARGV,@addr_addon;

	local $SIG{"PIPE"}=sub { die "Got SIGPIPE from ".sendmail_show(); };
	local *SENDMAIL;
	if ($opt_perlmail_dry_run) {
		print sendmail_show()."\n";
		*SENDMAIL=\*STDOUT;
		}
	else {
		defined (my $pid=open SENDMAIL,"|-") or die "Cannot fork to spawn ".sendmail_show().": $!";
		sendmail_orig_exec() if !$pid; # child
		}
	$head->print(\*SENDMAIL);
	print SENDMAIL "\n";	# MIME::Head->print() eats the empty line but it doesn't print it
	if (defined($stdin_body)) {
		print SENDMAIL $stdin_body;
		}
	else {
		local $_;
		while (<STDIN>) {
			print SENDMAIL $_;
			}
		}

	next if $opt_perlmail_dry_run;	# don't close our STDOUT as it is aliased to *SENDMAIL
	close SENDMAIL or warn "close(".sendmail_show()."): $?=".join(",",
			(!WIFEXITED($?)   ? () : ("EXITSTATUS(".WEXITSTATUS($?).")")),
			(!WIFSIGNALED($?) ? () : ("TERMSIG("   .WTERMSIG($?)   .")")),
			(!WIFSTOPPED($?)  ? () : ("STOPSIG("   .WSTOPSIG($?)   .")")),
			);
	my $gotcode=(!WIFEXITED($?) ? 99 : WEXITSTATUS($?));
	$exitcode=$gotcode if $gotcode>$exitcode;
	}
exit $exitcode;