apw | 3812c03 | 2006-12-07 21:01:14 +0000 | [diff] [blame] | 1 | #!/usr/bin/perl |
| 2 | # |
| 3 | # conmux-registry -- console name registry server |
| 4 | # |
| 5 | # Main registry server. This server holds host/port assignments for |
| 6 | # conmux daemons registering with it. This allows users to specify |
| 7 | # human names for their consoles and find the relevant conmux daemon. |
| 8 | # |
| 9 | # (C) Copyright IBM Corp. 2004, 2005, 2006 |
| 10 | # Author: Andy Whitcroft <andyw@uk.ibm.com> |
| 11 | # |
| 12 | # The Console Multiplexor is released under the GNU Public License V2 |
| 13 | # |
| 14 | use strict; |
| 15 | |
mbligh | f518048 | 2008-02-20 16:09:08 +0000 | [diff] [blame] | 16 | use FindBin; |
apw | 3812c03 | 2006-12-07 21:01:14 +0000 | [diff] [blame] | 17 | use Symbol qw(gensym); |
| 18 | |
| 19 | use IO::Socket; |
| 20 | use IO::Multiplex; |
| 21 | use URI::Escape; |
| 22 | |
| 23 | # Find our internal libraries. |
mbligh | f518048 | 2008-02-20 16:09:08 +0000 | [diff] [blame] | 24 | use lib $FindBin::Bin; |
apw | 3812c03 | 2006-12-07 21:01:14 +0000 | [diff] [blame] | 25 | use Conmux; |
| 26 | |
| 27 | our $P = 'conmux-registry'; |
| 28 | our $debug = 0; |
| 29 | |
| 30 | # |
| 31 | # LISTENER SOCKET: creates an intenet listener for new clients and |
| 32 | # connects them to the junction provided. |
| 33 | # |
| 34 | package ListenerSocket; |
| 35 | |
| 36 | sub new { |
| 37 | my ($class, $mux, $port, $registry) = @_; |
| 38 | my $self = bless { 'mux' => $mux, 'registry' => $registry }, $class; |
| 39 | |
| 40 | print "ListenerSocket::new [$self] mux<$mux> port<$port> " . |
| 41 | "registry<$registry>\n" if ($main::debug); |
| 42 | |
| 43 | $self->initialise($mux, $port, $registry); |
| 44 | |
| 45 | $self; |
| 46 | } |
| 47 | |
| 48 | sub initialise { |
| 49 | my ($self, $mux, $port, $registry) = @_; |
| 50 | my ($sock); |
| 51 | |
| 52 | print "ListenerSocket::initialise [$self] mux<$mux> port<$port> " . |
| 53 | "registry<$registry>\n" if ($main::debug); |
| 54 | |
| 55 | # Create a listening socket and add it to the multiplexor. |
| 56 | my $sock = new IO::Socket::INET(Proto => 'tcp', |
| 57 | LocalPort => $port, |
| 58 | Listen => 4, |
| 59 | ReuseAddr => 1) |
| 60 | or die "socket: $@"; |
| 61 | |
| 62 | print " adding $self $sock\n" if ($main::debug); |
| 63 | $mux->listen($sock); |
| 64 | $mux->set_callback_object($self, $sock); |
| 65 | $self->{'listener'} = $sock; |
| 66 | } |
| 67 | |
| 68 | # Handle new connections by instantiating a new client class. |
| 69 | sub mux_connection { |
| 70 | my ($self, $mux, $fh) = @_; |
| 71 | my ($client); |
| 72 | |
| 73 | print "ListenerSocket::mux_connection [$self] mux<$mux> fh<$fh>\n" |
| 74 | if ($main::debug); |
| 75 | |
| 76 | # Make a new client connection. |
| 77 | $client = Client->new($mux, $fh, $self->{'registry'}); |
| 78 | print " new connection $self $client\n" if ($main::debug); |
| 79 | } |
| 80 | |
| 81 | sub DESTROY { |
| 82 | my ($self) = @_; |
| 83 | |
| 84 | print "ListenerSocket::DESTROY [$self]\n" if ($main::debug); |
| 85 | |
| 86 | close($self->{'listener'}); |
| 87 | } |
| 88 | |
| 89 | # |
| 90 | # CLIENT: general client object, represents a remote client channel |
| 91 | # |
| 92 | package Client; |
| 93 | |
| 94 | sub new { |
| 95 | my ($class, $mux, $fh, $registry) = @_; |
| 96 | my $self = bless { 'mux' => $mux, |
| 97 | 'fh' => $fh, |
| 98 | 'registry' => $registry }, $class; |
| 99 | |
| 100 | print "Client::new [$self] mux<$mux> fh<$fh> registry<$registry>\n" |
| 101 | if ($main::debug); |
| 102 | |
| 103 | $self->initialise($mux, $fh, $registry); |
| 104 | |
| 105 | $self; |
| 106 | } |
| 107 | |
| 108 | sub initialise { |
| 109 | my ($self, $mux, $fh, $registry) = @_; |
| 110 | |
| 111 | print "Client::initialise [$self] mux<$mux> fh<$fh> " . |
| 112 | "registry<$registry>\n" if ($main::debug); |
| 113 | |
| 114 | $mux->set_callback_object($self, $fh); |
| 115 | } |
| 116 | |
| 117 | sub mux_input { |
| 118 | my ($self, $mux, $fh, $input) = @_; |
| 119 | |
| 120 | print "Client::mux_input [$self] mux<$mux> fh<$fh> input<$$input>\n" |
| 121 | if ($main::debug); |
| 122 | |
| 123 | while ($$input =~ s/^(.*?)\n//) { |
| 124 | my ($cmd, $args) = split(' ', $1, 2); |
| 125 | my (%args) = Conmux::decodeArgs($args); |
| 126 | |
| 127 | my $reply = { |
| 128 | 'status' => 'ENOSYS', |
| 129 | }; |
| 130 | |
| 131 | # Fill in the common results. |
| 132 | $reply->{'title'} = 'registry'; |
| 133 | |
| 134 | # Handle this command. |
| 135 | if ($cmd eq "LOOKUP") { |
| 136 | my $r = $self->{'registry'}->lookup($args{'service'}); |
| 137 | |
| 138 | if (defined $r) { |
| 139 | $reply->{'result'} = $r; |
| 140 | $reply->{'status'} = 'OK'; |
| 141 | |
| 142 | } else { |
| 143 | $reply->{'status'} = 'ENOENT entry not found'; |
| 144 | } |
| 145 | |
| 146 | } elsif ($cmd eq "ADD") { |
| 147 | $self->{'registry'}->add($args{'service'}, |
| 148 | $args{'location'}); |
| 149 | $reply->{'status'} = 'OK'; |
| 150 | |
| 151 | } elsif ($cmd eq "LIST") { |
| 152 | $reply->{'result'} = $self->{'registry'}->list(); |
| 153 | $reply->{'status'} = 'OK'; |
| 154 | } |
| 155 | |
| 156 | $fh->write(Conmux::encodeArgs($reply) . "\n"); |
| 157 | } |
| 158 | } |
| 159 | sub mux_eof { |
| 160 | my ($self, $mux, $fh, $input) = @_; |
| 161 | |
| 162 | print "Client::mux_eof [$self] mux<$mux> fh<$fh> input<$input>\n" |
| 163 | if ($main::debug); |
| 164 | |
| 165 | # Handle any pending input, then remove myself. |
| 166 | $self->mux_input($mux, $fh, $input); |
| 167 | |
| 168 | # Tell the multiplexor we no longer are using this channel. |
| 169 | $mux->shutdown($fh, 1); |
| 170 | } |
| 171 | sub mux_close { |
| 172 | my ($self, $mux, $fn) = @_; |
| 173 | |
| 174 | print "Client::close [$self]\n" if ($main::debug); |
| 175 | } |
| 176 | |
| 177 | sub DESTROY { |
| 178 | my ($self) = @_; |
| 179 | |
| 180 | print "Client::DESTROY [$self]\n" if ($main::debug); |
| 181 | } |
| 182 | |
| 183 | # |
| 184 | # REGISTRY: registry elements. |
| 185 | # |
| 186 | package Registry; |
| 187 | |
| 188 | sub new { |
| 189 | my ($class, $store) = @_; |
| 190 | my $self = bless { 'store' => $store }, $class; |
| 191 | |
| 192 | my ($key, $val); |
| 193 | |
| 194 | print "Registry::new [$self] store<$store>\n" if ($main::debug); |
| 195 | |
| 196 | # Open the store and populate the keys. |
| 197 | open(S, '<', $store) || die "Registry::new: $store: open failed - $!\n"; |
| 198 | while (<S>) { |
| 199 | chomp; |
| 200 | |
| 201 | ($key, $val) = split(' ', $_); |
| 202 | |
| 203 | $self->{'key'}->{$key} = $val; |
| 204 | } |
| 205 | close(S); |
| 206 | |
| 207 | $self; |
| 208 | } |
| 209 | |
| 210 | sub add { |
| 211 | my ($self, $what, $where) = @_; |
| 212 | |
| 213 | my ($key); |
| 214 | |
| 215 | print "Registry::add [$self] what<$what> where<$where>\n" |
| 216 | if ($main::debug); |
| 217 | |
| 218 | $self->{'key'}->{$what} = $where; |
| 219 | |
| 220 | print "$what at $where\n"; |
| 221 | |
| 222 | if (open(S, '>', $self->{'store'} . '.new')) { |
| 223 | foreach $key (sort keys %{$self->{'key'}}) { |
| 224 | print S "$key $self->{'key'}->{$key}\n"; |
| 225 | } |
| 226 | close(S); |
| 227 | rename $self->{'store'} . '.new', $self->{'store'}; |
| 228 | |
| 229 | } else { |
| 230 | warn "$P: $self->{'store'}.new: open failed - $!"; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | sub lookup { |
| 235 | my ($self, $what) = @_; |
| 236 | |
| 237 | print "Registry::lookup [$self] what<$what>\n" if ($main::debug); |
| 238 | |
| 239 | $self->{'key'}->{$what}; |
| 240 | } |
| 241 | |
| 242 | sub list { |
| 243 | my ($self) = @_; |
| 244 | my ($r, $key); |
| 245 | |
| 246 | print "Registry::list [$self]\n" if ($main::debug); |
| 247 | |
| 248 | foreach $key (sort keys %{$self->{'key'}}) { |
| 249 | $r .= "$key $self->{'key'}->{$key}\n"; |
| 250 | } |
| 251 | |
| 252 | $r; |
| 253 | } |
| 254 | |
| 255 | # |
| 256 | # MAIN: makes the IO multiplexor, listener and registry and stitches |
| 257 | # them all together. |
| 258 | # |
| 259 | package main; |
| 260 | |
| 261 | # Usage checks. |
| 262 | if ($#ARGV != 1) { |
| 263 | print STDERR "Usage: $P <local port> <store>\n"; |
| 264 | exit 1 |
| 265 | } |
| 266 | my ($lport, $store) = @ARGV; |
| 267 | |
| 268 | # Make a new multiplexer. |
| 269 | my $mux = new IO::Multiplex; |
| 270 | |
| 271 | # Make the registry object. |
| 272 | my $registry = Registry->new($store); |
| 273 | |
| 274 | # Create the client listener socket. |
| 275 | my $listener = ListenerSocket->new($mux, $lport, $registry); |
| 276 | |
| 277 | # Hand over to the multiplexor. |
| 278 | $mux->loop; |