1 files changed, 255 insertions, 0 deletions
diff --git a/fs_selfservice/FS-SelfService/freeside-selfservice-clientd b/fs_selfservice/FS-SelfService/freeside-selfservice-clientd
new file mode 100644
index 0000000..925bce6
--- /dev/null
+++ b/fs_selfservice/FS-SelfService/freeside-selfservice-clientd
@@ -0,0 +1,255 @@
+#!/usr/bin/perl -w
+#
+# freeside-selfservice-clientd
+#
+# This is run REMOTELY over ssh by freeside-selfservice-server
+
+use strict;
+use subs qw(spawn logmsg lock_write unlock_write);
+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('');
+
+my $tag = scalar(@ARGV) ? '.'.shift : '';
+
+use vars qw( $Debug );
+$Debug = 2; #2 will turn on child logging, 3 will log packet contents,
+            #including potentially compromising information
+
+my $socket = "/usr/local/freeside/selfservice_socket$tag";
+my $pid_file = "$socket.pid";
+
+my $log_file = "/usr/local/freeside/selfservice$tag.log";
+
+my $lock_file = "/usr/local/freeside/selfservice$tag.writelock";
+
+#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 $lock_file\n" if $Debug;
+open(LOCKFILE,">$lock_file") or die "can't open $lock_file: $!";
+
+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-$$] locking write stream\n" if $Debug > 1;
+        lock_write;
+
+        warn "[child-$$] sending packet to remote server\n" if $Debug > 1;
+        nstore_fd($packet, \*STDOUT) or die "FATAL: can't send response: $!";
+        
+        warn "[child-$$] flushing write stream\n" if $Debug > 1;
+        STDOUT->flush or die "FATAL: can't flush: $!";
+        
+        warn "[child-$$] releasing write lock\n" if $Debug > 1;
+        unlock_write;
+
+        warn "[child-$$] closing write stream\n" if $Debug > 1;
+        close STDOUT or die "FATAL: can't close write stream: $!"; #??!
+
+        warn "[child-$$] waiting for response from parent\n" 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;
+}
+
+sub lock_write {
+  #broken on freebsd?
+  #flock(STDOUT, LOCK_EX) or die "FATAL: can't lock write stream: $!";
+
+  flock(LOCKFILE, LOCK_EX) or die "FATAL: can't lock $lock_file: $!";
+}
+
+sub unlock_write {
+  #broken on freebsd?
+  #flock(STDOUT, LOCK_UN) or die "FATAL: can't release write lock: $!";
+
+  flock(LOCKFILE, LOCK_UN) or die "FATAL: can't unlock $lock_file: $!";
+}