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# Copyright (c) 1997-2024
# Ewgenij Gawrilow, Michael Joswig, and the polymake team
# Technische Universität Berlin, Germany
# https://polymake.org
#
# 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, or (at your option) any
# later version: http://www.gnu.org/licenses/gpl.txt.
#
# 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.
#-------------------------------------------------------------------------------
package Polymake::HostAgent;
use strict;
use Socket;
use IO::Handle;
my $socketfile=$ENV{POLYMAKE_HOST_AGENT};
sub call {
my $response="";
if (defined($socketfile) &&
defined(my $socket=connect_to_server())) {
$socket->autoflush;
print $socket "@_\n";
while (read $socket, $response, 1024, length($response)) { }
close $socket;
} else {
my $error= defined($socketfile)
? "Connection to socket $socketfile failed: $!\n"
: "Polymake host agent did not start.\n";
$error .= "Running programs outside the polymake container is disabled for this session\n.";
if ($_[0] eq "run") {
$response="ERROR: $error";
} else {
delete $ENV{POLYMAKE_HOST_AGENT};
print STDERR $error;
}
*call=sub { };
}
$response
}
sub connect_to_server {
my $socket;
if (-l $socketfile) {
my ($ip, $port)=split /:/, readlink($socketfile);
socket($socket, AF_INET, SOCK_STREAM, PF_UNSPEC) and
connect($socket, sockaddr_in($port, inet_aton($ip))) and
return $socket;
} elsif (-S $socketfile) {
socket($socket, AF_UNIX, SOCK_STREAM, PF_UNSPEC) and
connect($socket, sockaddr_un($socketfile)) and
return $socket;
}
undef
}
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