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#!/usr/bin/perl -w
#
# freeside-selfservice-clientd
#
# This is run REMOTELY over ssh by freeside-selfservice-server
use strict;
use subs qw(spawn logmsg);
use Fcntl qw(:flock);
use Socket;
use Storable qw(nstore_fd fd_retrieve);
use IO::Handle;
use IO::Select;
use IPC::Open2;
use LockFile::Simple qw(lock unlock);
use vars qw( $Debug );
$Debug = 2;
my $socket = "/usr/local/freeside/selfservice_socket";
my $pid_file = "$socket.pid";
my $lock_file = "$socket.lock";
unlink $lock_file;
my $me = '[client]';
$|=1;
#read data to be cached or something
#warn "$me Reading init data\n" if $Debug;
#my $signup_init =
warn "[client] Creating $socket\n" if $Debug;
my $uaddr = sockaddr_un($socket);
my $proto = getprotobyname('tcp');
socket(Server,PF_UNIX,SOCK_STREAM,0) or die "socket: $!";
unlink($socket);
bind(Server, $uaddr) or die "bind: $!";
listen(Server,SOMAXCONN) or die "listen: $!";
if ( -e $pid_file ) {
open(PIDFILE,"<$pid_file");
#chomp( my $old_pid = <PIDFILE> );
my $old_pid = <PIDFILE>;
close PIDFILE;
$old_pid =~ /^(\d+)$/;
kill 'TERM', $1;
}
open(PIDFILE,">$pid_file");
print PIDFILE "$$\n";
close PIDFILE;
#my $waitedpid;
#sub REAPER { $waitedpid = wait; $SIG{CHLD} = \&REAPER; }
#$SIG{CHLD} = \&REAPER;
warn "[client] entering main loop\n" if $Debug;
#sub spawn;
#sub logmsg;
my %kids;
# my $gar = <STDIN>;
#my $s = new IO::Select;
#$s->add(\*STDIN);
#$s->add(\*Server);
#for ( $waitedpid = 0;
# accept(Client,Server) || $waitedpid;
# $waitedpid = 0, close Client)
#{
# next if $waitedpid;
#$SIG{PIPE} = sub { warn "SIGPIPE received" };
#$SIG{CHLD} = sub { warn "SIGCHLD received" };
sub REAPER { warn "SIGCHLD received"; my $pid = wait; $SIG{CHLD} = \&REAPER; }
#sub REAPER { my $pid = wait; delete $kids{$pid}; $SIG{CHLD} = \&REAPER; }
$SIG{CHLD} = \&REAPER;
warn "[client] creating IO::Select\n" if $Debug;
my $s = new IO::Select;
$s->add(\*STDIN);
$s->add(\*Server);
while (1) {
warn "[client] waiting for connection or token\n" if $Debug;
while ( my @handles = $s->can_read ) {
foreach my $handle ( @handles ) {
if ( $handle == \*STDIN ) {
# my $gar = <STDIN>;
# die $gar;
my $packet = fd_retrieve(\*STDIN);
my $token = $packet->{'_token'};
warn "[client] received packet with token $token\n".
join('', map { " $_=>$packet->{$_}\n" } keys %$packet )
if $Debug;
if ( exists($kids{$token}) ) {
warn "[client] sending return packet to $token via $kids{$token}\n"
if $Debug;
nstore_fd($packet, $kids{$token});
warn "[client] flushing $kids{$token}\n" if $Debug;
$kids{$token}->flush;
#eval { $kids{$token}->flush; };
#die "error flushing?!?!? $@\n" if $@ ne '';
#warn "[client] closing $kids{$token}\n";
#close $kids{$token};
#warn "[client] deleting $kids{$token}\n";
#delete $kids{$token};
warn "[client] done with $token\n" if $Debug;
} else {
warn "[client] WARNING: unknown token $token, discarding message";
#die "[client] FATAL: unknown token $token, discarding message";
}
} elsif ( $handle == \*Server ) {
warn "[client] received local connection; forking\n" if $Debug;
accept(Client, Server);
spawn sub { #child
warn "[client-$$] reading packet from local client" if $Debug > 1;
my $packet = fd_retrieve(\*Client);
warn "[client-$$] packet received:\n".
join('', map { " $_=>$packet->{$_}\n" } keys %$packet )
if $Debug > 1;
my $command = $packet->{'command'};
#handle some commands weirdly?
$packet->{_token}=$$; #??
warn "[client-$$] sending packet to remote server" if $Debug > 1;
flock(STDOUT, LOCK_EX); #acquire write lock
#lock($lock_file);
nstore_fd($packet, \*STDOUT);
STDOUT->flush;
#unlock($lock_file);
flock(STDOUT, LOCK_UN); #release write lock
warn "[client-$$] waiting for response from parent" if $Debug > 1;
#block until parent has a message
my $w = new IO::Select;
$w->add(\*STDIN);
my @wait = $w->can_read;
my $rv = fd_retrieve(\*STDIN);
#close STDIN;
warn "[client-$$] sending response to local client" if $Debug > 1;
#send message to local client
nstore_fd($rv, \*Client);
Client->flush;
close Client;
warn "[client-$$] child exiting" if $Debug > 1;
#while (1) { sleep 5 };
#sleep 5;
exit;
}; #eo child
#close Client; #in parent, right?
} else {
die "wtf? $handle";
}
}
warn "[client] done handling messages; returning to wait-state" if $Debug;;
}
#die "[client] died unexpectedly: $!\n";
warn "[client] fell-through unexpectedly: $!\n" if $Debug;
} #WTF?
sub spawn {
my $coderef = shift;
unless (@_ == 0 && $coderef && ref($coderef) eq 'CODE') {
use Carp;
confess "usage: spawn CODEREF";
}
my $pid;
#if (!defined($pid = fork)) {
my $kid = new IO::Handle;
if (!defined($pid = open($kid, '|-'))) {
logmsg "WARNING: cannot fork: $!";
return;
} elsif ($pid) {
logmsg "begat $pid" if $Debug;
$kids{$pid} = $kid;
#$kids{$pid}->autoflush;
return; # I'm the parent
}
# else I'm the child -- go spawn
# open(STDIN, "<&Client") || die "can't dup client to stdin";
# open(STDOUT, ">&Client") || die "can't dup client to stdout";
## open(STDERR, ">&STDOUT") || die "can't dup stdout to stderr";
exit &$coderef();
}
#sub logmsg { print "$0 $$: @_ at ", scalar localtime, "\n" }
#DON'T PRINT!!!!!
sub logmsg { warn "[client] $0 $$: @_ at ", scalar localtime, "\n" }
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