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#!/usr/bin/perl -w |
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|
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use strict; |
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use IO::Socket; |
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|
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# gedafed 1.5, dws@ee.ethz.ch, 2001/02/17 |
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|
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# Protocol definition: |
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# |
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# 0) from client: SITE url |
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# to client: OK\n |
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# (mandatory before each of the following requests) |
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# |
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# 1) from client: SET user pass\n |
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# to client: ticket\n |
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# |
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# 2) from client: GET ticket\n |
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# to client: OK user pass\n |
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# or to client: FAIL\n |
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# |
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# 3) from client: CLEAR ticket\n |
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# to client: OK\n |
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# |
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# 4) from client: GETUNIQUE\n |
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# to client: unique-id\n |
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# |
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# 5) from client: DROPUNIQUE unique-id\n |
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# to client: (OK|FALSE)\n |
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|
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# TODO: cleanup expired tickets |
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|
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my $DEBUG=0; |
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my $socket_path = '/tmp/.gedafed.sock'; |
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my $tickets_validity = 7200; # in seconds, delete ticket after that delay of non-use |
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#my $tickets_validity = 10; |
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|
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my %tickets_cache = (); |
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my %uniques_cache = (); |
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|
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if($> == 0) { |
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# we don't need root privileges |
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$> = getpwnam('nobody'); |
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} |
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|
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$SIG{PIPE}='IGNORE'; |
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|
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if(grep /-d/, @ARGV) { |
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print "Debug mode.\n"; |
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$DEBUG=1 |
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} |
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|
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sub rand_ascii_32 |
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{ |
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return sprintf "%04x%04x", rand()*(1<<16), rand()*(1<<16); |
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} |
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|
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sub gen_ticket |
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{ |
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return sprintf("%08x", time) . '-' . rand_ascii_32 . '-' . rand_ascii_32 . '-' . rand_ascii_32; |
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} |
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|
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sub myprint($$) |
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{ |
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my $conn = shift; |
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my $str = shift; |
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print $conn $str; |
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print "> $str" if $DEBUG; |
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} |
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|
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unlink $socket_path; |
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my $socket = IO::Socket::UNIX->new(Local => $socket_path, |
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Listen => 5 ) |
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or die "Couldn't setup unix-domain socket ($socket_path): $!\n"; |
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|
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chmod 0666, $socket_path; |
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|
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while(defined (my $conn = $socket->accept)) { |
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# SITE |
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$_ = <$conn>; |
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if(/^\s*$/) { next; } |
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print "< $_" if $DEBUG; |
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chomp; |
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if(!/^SITE (.+)$/) { |
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myprint $conn, "FAIL\n"; |
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$conn->close; |
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next; |
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} |
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my $site = "$1"; |
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myprint $conn, "OK\n"; |
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|
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# REQUEST |
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$_ = <$conn>; |
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if(/^\s*$/) { next; } |
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print "< $_" if $DEBUG; |
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chomp; |
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if(/^SET ([^ ]+) (.+)$/) { |
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my $ticket = gen_ticket; |
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my $exp = time + $tickets_validity; |
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$tickets_cache{$site}{$ticket} = [ $1, $2, $exp ]; |
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myprint $conn, "$ticket\n"; |
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} |
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elsif(/^GET ([\w-]+)$/) { |
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my $data = $tickets_cache{$site}{$1}; |
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if(!$data or $data->[2]<time) { |
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myprint $conn, "FAIL\n"; |
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} |
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else { |
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# refresh |
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$data->[2] = time + $tickets_validity; |
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# send user/pass |
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myprint $conn, "OK $data->[0] $data->[1]\n"; |
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} |
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} |
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elsif(/^CLEAR ([\w-]+)$/) { |
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delete $tickets_cache{$site}{$1}; |
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myprint $conn, "OK\n"; |
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} |
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elsif(/^GETUNIQUE$/) { |
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my $id = gen_ticket; |
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$uniques_cache{$site}{$id}=1; |
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myprint $conn, "$id\n"; |
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} |
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elsif(/^DROPUNIQUE ([\w-]+)$/) { |
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if(exists $uniques_cache{$site}{$1}) { |
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delete $uniques_cache{$site}{$1}; |
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myprint $conn, "OK\n"; |
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} |
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else { |
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myprint $conn, "FAIL\n"; |
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} |
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} |
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elsif(/^\s$/) { |
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; |
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} |
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else { |
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print STDERR "Protocol Error: $_"; |
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myprint $conn, "ERROR\n"; |
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} |
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print "\n" if $DEBUG; |
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$conn->close; |
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} |
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