mirror of
https://github.com/fhem/fhem-mirror.git
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129 lines
3.4 KiB
Perl
129 lines
3.4 KiB
Perl
#!/usr/bin/perl
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# et_server/et_client: an "ssh -Rport" replacement.
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# Problem: webserver is behind a firewall without the possibility of opening a
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# hole in th firewall. Solution: start et_server on a publicly available host,
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# and connect to it via et_client from inside of the firewall.
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use warnings;
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use strict;
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use IO::Socket;
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die "Usage: et_server.pl controlPort serverPort\n"
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if(int(@ARGV) != 2);
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my $csfd = IO::Socket::INET->new(LocalPort=>$ARGV[0], Listen=>10, ReuseAddr=>1);
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die "Opening port $ARGV[0]: $!\n" if(!$csfd);
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my $sfd = IO::Socket::INET->new(LocalPort=>$ARGV[1], Listen=>10, ReuseAddr=>1);
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die "Opening port $ARGV[1]: $!\n" if(!$sfd);
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print "Serverports opened, waiting for et_client\n";
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my @clientinfo = $csfd->accept();
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my $cfd = $clientinfo[0];
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my ($port, $iaddr) = sockaddr_in($clientinfo[1]);
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print "et called from ".inet_ntoa($iaddr).":$port\n";
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my %clients;
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for(;;) {
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my ($rin,$rout) = ('','');
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vec($rin, $sfd->fileno(), 1) = 1;
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vec($rin, $cfd->fileno(), 1) = 1;
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vec($rin, $csfd->fileno(), 1) = 1;
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foreach my $c (keys %clients) {
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vec($rin, fileno($clients{$c}{fd}), 1) = 1;
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}
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my $nfound = select($rout=$rin, undef, undef, undef);
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if($nfound < 0) {
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print("select: $!");
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last;
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}
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# New server connection
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if(vec($rout, $sfd->fileno(), 1)) {
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#print "SRV: ACC\n";
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my @clientinfo = $sfd->accept();
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if(!@clientinfo) {
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print "Accept failed: $!";
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next;
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}
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my $fd = $clientinfo[0];
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$clients{$fd}{fd} = $fd;
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syswrite($cfd, "1");
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print "Local conn request\n";
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}
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# New et-line
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if(vec($rout, $csfd->fileno(), 1)) {
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#print "CTL: ACC\n";
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my @clientinfo = $csfd->accept();
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if(!@clientinfo) {
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print "Accept failed: $!\n";
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next;
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}
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my $fd = $clientinfo[0];
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my $peer;
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map { $peer = $_ if(!defined($clients{$_}{peer})) } keys %clients;
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if(!$peer) {
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close($fd);
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print "ET without request\n";
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next;
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}
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$clients{$fd}{fd} = $fd;
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my ($port, $iaddr) = sockaddr_in($clientinfo[1]);
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$clients{$fd}{fd} = $fd;
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$clients{$fd}{addr} = inet_ntoa($iaddr) . ":$port";
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$clients{$fd}{peer} = $peer;
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$clients{$peer}{peer} = $fd;
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if($clients{$peer}{buf}) {
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syswrite($fd, $clients{$peer}{buf});
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delete($clients{$peer}{buf});
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}
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print "ET line established\n";
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}
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if(vec($rout, $cfd->fileno(), 1)) {
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print "ET client left, exiting\n";
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exit(1);
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}
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# Data from one of the clients
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CLIENT:foreach my $c (keys %clients) {
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next if(!vec($rout, fileno($clients{$c}{fd}), 1));
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my $peer = $clients{$c}{peer}; $peer = "" if(!$peer);
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my $addr = $clients{$c}{addr}; $addr = "" if(!$addr);
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my $buf;
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my $ret = sysread($clients{$c}{fd}, $buf, 256);
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#print "C:$c: P:$peer R:$ret\n";
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if(!defined($ret) || $ret <= 0) {
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print "Client $addr left us\n";
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if($peer) {
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close($clients{$peer}{fd}); delete($clients{$peer});
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}
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close($clients{$c}{fd}); delete($clients{$c});
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last CLIENT;
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}
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if($peer) {
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while(length($buf)) {
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my $ret = syswrite($clients{$peer}{fd}, $buf);
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if(!$ret) {
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print "Write error to $peer from $c\n";
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close($clients{$peer}{fd}); delete($clients{$peer});
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close($clients{$c}{fd}); delete($clients{$c});
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last CLIENT;
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}
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$buf = substr($buf, $ret);
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}
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} else {
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$clients{$c}{buf} = "" if(!defined($clients{$c}{buf}));
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$clients{$c}{buf} .= $buf;
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}
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}
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}
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