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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 POSIX qw(:sys_wait_h);
use Socket;
use Storable qw(nstore_fd fd_retrieve);
use IO::Handle qw(_IONBF);
use IO::Select;
use IO::File;
STDOUT->setbuf('');
use vars qw( $Debug );
$Debug = 2; #2 will turn on child logging, 3 will log packet contents,
#including potentially compromising information
my $socket = "/usr/local/freeside/selfservice_socket";
my $pid_file = "$socket.pid";
my $log_file = "/usr/local/freeside/selfservice.log";
#my $me = '[client]';
$|=1;
$SIG{__WARN__} = \&_logmsg;
#read data to be cached or something
#warn "$me Reading init data\n" if $Debug;
#my $signup_init =
warn "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");
my $old_pid = <PIDFILE>;
close PIDFILE;
$old_pid =~ /^(\d+)$/;
kill 'TERM', $1;
}
open(PIDFILE,">$pid_file");
print PIDFILE "$$\n";
close PIDFILE;
#my $waitedpid;
#sub REAPER { $waitedpid = wait; $SIG{CHLD} = \&REAPER; }
#$SIG{CHLD} = \&REAPER;
warn "entering main loop\n" if $Debug;
my %kids;
my $s = new IO::Select;
$s->add(\*STDIN);
$s->add(\*Server);
#for ( $waitedpid = 0;
# accept(Client,Server) || $waitedpid;
# $waitedpid = 0, close Client)
#{
# next if $waitedpid;
#$SIG{PIPE} = sub { warn "SIGPIPE received" };
#$SIG{CHLD} = sub { warn "SIGCHLD received" };
#sub REAPER { warn "SIGCHLD received"; my $pid = wait; $SIG{CHLD} = \&REAPER; }
#sub REAPER { my $pid = wait; $SIG{CHLD} = \&REAPER; }
#sub REAPER { my $pid = wait; delete $kids{$pid}; $SIG{CHLD} = \&REAPER; }
#$SIG{CHLD} = \&REAPER;
my $undisp = 0;
while (1) {
&reap_kids;
warn "waiting for connection\n" if $Debug && !$undisp;
#my @handles = $s->can_read();
my @handles = $s->can_read(5);
$undisp = !scalar(@handles);
foreach my $handle ( @handles ) {
if ( $handle == \*STDIN ) {
warn "receiving packet from server\n" if $Debug;
my $packet = fd_retrieve(\*STDIN);
my $token = $packet->{'_token'};
warn "received packet from server with token $token\n".
( $Debug > 2
? join('', map { " $_=>$packet->{$_}\n" } keys %$packet )
: '' )
if $Debug;
if ( exists($kids{$token}) ) {
warn "sending return packet to $token via $kids{$token}\n"
if $Debug;
nstore_fd($packet, $kids{$token});
warn "flushing to $token\n" if $Debug;
until ( $kids{$token}->flush ) {
warn "WARNING: error flushing: $!";
sleep 1;
}
#no close or delete here - will block waiting for child
warn "done with $token\n" if $Debug;
} else {
warn "WARNING: unknown token $token, discarding message";
}
} elsif ( $handle == \*Server ) {
until ( accept(Client, Server) ) {
warn "WARNING: accept failed: $!";
next;
}
warn "received local connection; forking\n" if $Debug;
spawn sub { #child
warn "[child-$$] reading packet from local client" if $Debug > 1;
my $packet = fd_retrieve(\*Client);
warn "[child-$$] packet received:\n".
join('', map { " $_=>$packet->{$_}\n" } keys %$packet )
if $Debug > 2;
my $command = $packet->{'command'};
#handle some commands weirdly?
$packet->{_token}=$$;
warn "[child-$$] sending packet to remote server" if $Debug > 1;
flock(STDOUT, LOCK_EX) or die "FATAL: can't lock write stream: $!";
nstore_fd($packet, \*STDOUT) or die "FATAL: can't send response: $!";
STDOUT->flush or die "FATAL: can't flush: $!";
flock(STDOUT, LOCK_UN) or die "FATAL: can't release write lock: $!";
close STDOUT or die "FATAL: can't close write stream: $!"; #??!
warn "[child-$$] waiting for response from parent" if $Debug > 1;
my $w = new IO::Select;
$w->add(\*STDIN);
until ( $w->can_read ) {
warn "[child-$$] WARNING: interrupted select: $!\n";
}
my $rv = fd_retrieve(\*STDIN);
#close STDIN;
warn "[child-$$] sending response to local client" if $Debug > 1;
nstore_fd($rv, \*Client);
Client->flush or die "FATAL: can't flush to local client: $!";
close Client or die "FATAL: can't close connection to local client: $!";
warn "[child-$$] child exiting" if $Debug > 1;
exit;
}; #eo child
#close Client;
} else {
die "wtf? $handle";
}
}
}
sub reap_kids {
#warn "reaping kids\n";
foreach my $pid ( keys %kids ) {
my $kid = waitpid($pid, WNOHANG);
if ( $kid > 0 ) {
close $kids{$kid};
delete $kids{$kid};
}
}
#warn "done reaping\n";
}
sub spawn {
my $coderef = shift;
unless (@_ == 0 && $coderef && ref($coderef) eq 'CODE') {
use Carp;
confess "usage: spawn CODEREF";
}
my $pid;
#if (!defined($pid = fork)) {
my $kid = new IO::Handle;
if (!defined($pid = open($kid, '|-'))) {
warn "WARNING: cannot fork: $!";
return;
} elsif ($pid) {
warn "begat $pid" if $Debug;
$kids{$pid} = $kid;
#$kids{$pid}->autoflush;
return; # I'm the parent
}
# else I'm the child -- go spawn
# open(STDIN, "<&Client") || die "can't dup client to stdin";
# open(STDOUT, ">&Client") || die "can't dup client to stdout";
# open(STDERR, ">&STDOUT") || die "can't dup stdout to stderr";
exit &$coderef();
}
sub _logmsg {
chomp( my $msg = shift );
my $log = new IO::File ">>$log_file";
flock($log, LOCK_EX);
seek($log, 0, 2);
print $log "[client] [". scalar(localtime). "] [$$] $msg\n";
flock($log, LOCK_UN);
close $log;
}
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