#!/usr/bin/perl
##!~_~perlpath~_~
#
# Interchange link program configurator
#
# Copyright (C) 2002-2007 Interchange Development Group
# Copyright (C) 1996-2002 Red Hat, Inc.
#
# 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., 51 Franklin St, Fifth Floor, Boston,
# MA  02110-1301  USA.

use lib '/usr/local/interchange/lib';
#use lib '~_~INSTALLPRIVLIB~_~';
use lib '/usr/local/interchange';
#use lib '~_~INSTALLARCHLIB~_~';

use strict;
use Config;
use File::Copy;
use Getopt::Long;

use vars qw/$Self/;

Getopt::Long::config(qw/permute no_ignore_case/);

BEGIN {
	$::Self = {
		LINK_HOST      => '127.0.0.1',
		LINK_PORT      => 7786,
		LINK_TIMEOUT   => 30,
		LINK_FILE      => '/usr/local/interchange/etc/socket',
#		LINK_FILE      => '~_~INSTALLARCHLIB~_~/etc/socket',
		SRC_DIR        => '/usr/local/interchange/src',
#		SRC_DIR        => '~_~INSTALLARCHLIB~_~/src',
		INSTALLPRIVLIB => '/usr/local/interchange/lib',
#		INSTALLPRIVLIB => '~_~INSTALLPRIVLIB~_~',
		INSTALLARCHLIB => '/usr/local/interchange',
#		INSTALLARCHLIB => '~_~INSTALLARCHLIB~_~',
		INSTALLMAN1DIR => '/usr/local/interchange/doc',
#		INSTALLMAN1DIR => '~_~INSTALLMAN1DIR~_~',
		INSTALLSCRIPT => '/usr/local/interchange/bin',
#		INSTALLSCRIPT => '~_~INSTALLARCHLIB~_~/bin',
		INSTALLBIN => '/usr/local/interchange/bin',
#		INSTALLBIN => '~_~INSTALLBIN~_~',
	};
}

### END CONFIGURATION VARIABLES

my $prog = $0;
$prog =~ s:.*/::;
my $USAGE = <<EOF;
usage: $prog [-p tcp_port] [-s sockfile] [-h host] [-w secs] \
             [--perl] [-o outputfile] [--suid]

Configures Interchange link program.

options:

  -b dir, --build=dir   Alternate build directory
                         (default $Self->{SRC_DIR})
  -e, --error-file      File to build error message from
  -f, --force           Force compile even if already there
  -h host, --host=host  Name of host the TCP link should contact
                         (default $Self->{LINK_HOST})
  -i, --inetmode        Copy the tlink file to outputfile
  -n, --nostrip         Don't try and strip(1) the executable files
  -o cgifile,           Write it to a specific file as well as the
     --output=cgifile    link catalog directory
  -p port, --port=port  Port number to use (default $Self->{LINK_PORT})
  -S status             HTTP status line to use for error (default 504 timeout)
  -s socketfile,        Location of UNIX socket (default
      --socket=file      $Self->{INSTALLARCHLIB}/etc/socket)
  -t content-type       HTTP content-type (default text/html)
  -w N, --timeout=N     Number of seconds before timeout (default $Self->{LINK_TIMEOUT})
  -u, --unixmode        Copy the vlink file to outputfile (default)
  --nosuid              Don't change mode to suid for vlink (CGIWRAP)
  --perl                Use Perl tlink program
  --source              Alternate source dir (default $Self->{SRC_DIR})
EOF

my $Output;
my $Force;
my @Flags;
my $Inet;
my $Unix = 1;
my $NoSUID;
my $Nostrip;
my $ErrorFile;
my $Status = "504 Gateway Timeout";
my $ContentType = 'text/html';
my $Perl_tlink;
my $Build_dir;

my %optctl = (

    'port'          => \ $Self->{LINK_PORT},
    'timeout'       => \ $Self->{LINK_TIMEOUT},
    'host'          => \ $Self->{LINK_HOST},
    'socket'        => \ $Self->{LINK_FILE},
    'build'         => \ $Build_dir,
    'source'        => \ $Self->{SRC_DIR},
    'inetmode'      => \ $Inet,
    'content-type'  => \ $ContentType,
    'status'        => \ $Status,
    'error-file'    => \ $ErrorFile,
    'unixmode'      => \ $Unix,
    'nosuid'        => \ $NoSUID,
    'nostrip'       => \ $Nostrip,
    'perl'          => \ $Perl_tlink,
    'force'         => \ $Force,
    'outputfile'    => \ $Output,
	'<>'			=> sub {
							push @Flags, shift;
						},
);

my @options = ( qw/

    port|p=i
    timeout|w=i
    host|h=s
	socket|s=s
	inetmode|i
	unixmode|u
	nostrip|n
	nosuid
	perl
	error-file|e=s
	content-type|t=s
	status|S=s
	force|f
    build|b=s
    source=s
	outputfile|o=s
    <>

/ );

GetOptions(\%optctl, @options)			or die "\n$USAGE\n";

sub doit {
	my ($self, $orig, $template, $preamble, $key, $postamble) = @_;
	my $replace =  $Self->{$key} || $Config{$key};
#warn <<EOF;
#orig=$orig
#template=$template
#key=$key
#replace=$replace
#EOF
	return "$orig$template" unless defined $replace;
	return "$preamble$replace$postamble$template";
}

if($Build_dir and $Build_dir ne $Self->{SRC_DIR}) {
	if (-e $Build_dir and (! -d _ or ! -w _)) {
		die "Cannot use $Build_dir for build directory.\n";
	}
	elsif (! -d $Build_dir) {
		mkdir $Build_dir, 0777
			or die "Could not make directory $Build_dir: $!\n";
	}
	my @files = glob("$Self->{SRC_DIR}/*");
	for(@files) {
		next unless -f $_;
		File::Copy::copy($_, $Build_dir)
			or die "copy $_ to $Build_dir: $!\n";
	}
	chdir $Build_dir
		or die "Couldn't change to build directory: $!\n";
}
else {
	chdir $Self->{SRC_DIR}
		or die "Couldn't change to source directory: $!\n";
}

if($Status !~ /^\d+\s+\w+/) {
		die "Misformed status value -- should be numeric code followed by message.\n";
}

$Self->{LINK_MESSAGE_HEAD}
	= qq{Status: $Status\\r\\nContent-Type: $ContentType\\r\\n\\r\\n};

if($ErrorFile) {
	unless(-f $ErrorFile and -r $ErrorFile) {
		die "error message file $ErrorFile missing.\n";
	}

	open ERRFILE, $ErrorFile
		or die "Read error message file $ErrorFile: $!\n";
	
	for(1 .. 3) {
		my $line = <ERRFILE>;
		$line ||= ' ';
		$line =~ s/\\/\\\\/g;
		$line =~ s/\r/\\r/g;
		$line =~ s/\n/\\n/g;
		$line =~ s/"/\\"/g;
		$Self->{"LINK_MESSAGE_LINE$_"} = $line;
	}

	my $line = '';
	while(<ERRFILE>) {
		$line .= $_;
	}

	$line ||= ' ';
	$line =~ s/\\/\\\\/g;
	$line =~ s/\r/\\r/g;
	$line =~ s/\n/\\n/g;
	$line =~ s/"/\\"/g;
	$Self->{"LINK_MESSAGE_LINE4"} = $line;
}

if(! $Perl_tlink and $Force || ! -f "config.h" || ! -f "syscfg") {
	system "/bin/sh ./configure";
	if($?) {
		die "Couldn't run configure; probably no C compiler.\n";
	}
}

my @edit_files = qw/config.h tlink.pl vlink.pl/;

foreach my $targ (@edit_files) {
	my $src = "$targ.tmp";
	die "Source file $src doesn't exist\n" if ! -e $targ;
	die "Can't edit a directory\n"         if -d $targ;
	die "Can't edit a directory\n"         if -d $src;
	rename $targ, $src
		or die "Couldn't rename $targ to $src: $!\n";
	open (IN, "< $src")
		or die "Couldn't read $src: $!\n";
	open (OUT, ">$targ")
		or die "Couldn't write $targ: $!\n";
	local($/);
	$_ = <IN>;
	close IN;
	s{(~@~(\w+)~@~)}{doit($Self, $1, '', '', $2, '')}eg;
	s{(.*)(\n[ 	]*#(.*)~_~(\w+)~_~(.*))}{doit($Self, $1, $2, $3, $4, $5)}eg;
	s{(.*)(\n[ 	]*/\*(.*)~_~(\w+)~_~(.*)\*/)}{doit($Self, $1, $2, $3, $4, $5)}eg;
	print OUT $_;
	close OUT or die "close $targ: $!\n";
	unlink $src;
}

my $Intermediate;

COMPILE: {

	use vars qw/$CC $DEFS $LIBS $CFLAGS/;

	if($Perl_tlink) {
		$Intermediate = 'tlink.pl.$Self->{LINK_HOST}.$Self->{LINK_PORT}';
		$Intermediate =~ s/\W/./g;
		File::Copy::copy('tlink.pl', $Intermediate)
			or die "Cannot write intermediate file $Intermediate: $!\n";
		File::Copy::copy('tlink.pl', 'tlink')
			or die "Cannot write tlink: $!\n";
		chmod 0755, 'tlink';
		undef $Unix;
		$Inet = 1;
		last COMPILE;
	}
	elsif($Inet) {
		undef $Unix;
	}

	# Compile

	my $vlink_file = $Self->{LINK_FILE};
	$vlink_file =~ s/[^A-Za-z0-9.]/_/g;
	$vlink_file = "vlink.$vlink_file";

	my $tlink_file = "tlink.$Self->{LINK_HOST}.$Self->{LINK_PORT}";
	$tlink_file =~ s/\W/./g;

	$Intermediate = $Inet ? $tlink_file : $vlink_file;

	unlink $Intermediate if $Force;

	do "./syscfg";
	if(! -f $vlink_file) {
		system "$CC $CFLAGS $DEFS $LIBS vlink.c -o $vlink_file";
		if($?) {
			warn "Problem compiling $vlink_file.\n";
		}
		else {
			system "strip $vlink_file"
				unless $Nostrip;
			File::Copy::copy($vlink_file, 'vlink');
			chmod 0755, 'vlink';
		}
	}
	else {
		print "Skipping compile of $vlink_file, already done.\n";
		File::Copy::copy($vlink_file, 'vlink');
		chmod 0755, 'vlink';
	}
	if(! -f $tlink_file) {
		system "$CC $CFLAGS $DEFS $LIBS tlink.c -o $tlink_file";
		if($?) {
			warn "Problem compiling $tlink_file.\n";
		}
		else {
			system "strip $tlink_file"
				unless $Nostrip;
			File::Copy::copy($tlink_file, 'tlink');
			chmod 0755, 'tlink';
		}
	}
	else {
		print "Skipping compile of $tlink_file, already done.\n";
		File::Copy::copy($tlink_file, 'tlink');
		chmod 0755, 'tlink';
	}

	if(! -f $Intermediate) {
		die "Couldn't compile your choice of link '$Intermediate'\n";
	}
}

if($Output) {
	if (-e $Output and ! $Force) {
		my $ans;
		print "Output file $Output exists. Overwrite? [y/N] ";
		$ans = <>;
		exit unless $ans =~ /^\s*y/i;
	}
	File::Copy::copy($Intermediate, $Output)
		or die "Cannot write output file $Output: $!\n";
	if($Unix and ! $NoSUID) {
		chmod 04755, $Output
			or die "Couldn't make $Output SUID: $!\n";
	}
	else {
		chmod 0755, $Output
			or die "Couldn't chmod 755 $Output: $!\n";
	}
}

=head1 NAME

compile_link -- compile and copy Interchange link CGI

=head1 VERSION

1.0

=head1 SYNOPSIS

   compile_link [-p NNNN] [-s sfile] [-h host] [-w N] \\
	        [--perl] [-nf] [-o outputfile] [-b dir] [-s dir]

=head1 DESCRIPTION

The C<compile_link> program configures (including compilation if
necessary) a link CGI for talking to the Interchange server daemon.

If the --perl option is given, it will not compile but instead use the
tlink.pl program, setting its variables as needed.

Designed to be used in conjunction with Interchange's makecat.

=head1 OPTIONS

=over 4

=item -b dir, --build=dir

Sets the directory where the build files will be made. Default is C<src> in
the Interchange software directory.

=item -h hostname, --host=hostname

Sets the host address or host name that should be compiled into the
TCP-based link program.  This sets the default, which still can be
overridden by C<MINIVEND_HOST> in the environment of the executing process.

=item -p NNNN, --port=NNNN

Sets the port number that should be compiled into the TCP-based link program.
This sets the default, which still can be overridden by C<MINIVEND_PORT> in the
environment of the executing process. The port must be higher than 1024.

=item -s sfile, --socket=sfile

The name of the UNIX-domain socket file which should be compiled into the
UNIX-domain link program. This sets the default, which still can be
overridden by C<MINIVEND_SOCKET> in the environment of the executing process. 

=item --source=dir

Sets the directory containing the source files. Default is C<src> in
the Interchange software directory.

=item -w N, --timeout=N

The number of seconds the link program should wait for a connection before
sending its timeout page.


=back

=head1 SEE ALSO

makecat(1), https://www.interchangecommerce.org/

=head1 AUTHOR

Mike Heins

