3 # freeside-selfservice-clientd
5 # This is run REMOTELY over ssh by freeside-selfservice-server
8 use subs qw(spawn logmsg lock_write unlock_write);
10 use POSIX qw(:sys_wait_h);
12 use Storable qw(nstore_fd fd_retrieve);
13 use IO::Handle qw(_IONBF);
19 use vars qw( $Debug );
20 $Debug = 3; #2 will turn on child logging, 3 will log packet contents,
21 #including potentially compromising information
23 my $socket = "/usr/local/freeside/selfservice_socket";
24 my $pid_file = "$socket.pid";
26 my $log_file = "/usr/local/freeside/selfservice.log";
28 my $lock_file = "/usr/local/freeside/selfservice.writelock";
34 $SIG{__WARN__} = \&_logmsg;
36 #read data to be cached or something
37 #warn "$me Reading init data\n" if $Debug;
40 warn "Creating $lock_file\n" if $Debug;
41 open(LOCKFILE,">$lock_file") or die "can't open $lock_file: $!";
43 warn "Creating $socket\n" if $Debug;
44 my $uaddr = sockaddr_un($socket);
45 my $proto = getprotobyname('tcp');
46 socket(Server,PF_UNIX,SOCK_STREAM,0) or die "socket: $!";
48 bind(Server, $uaddr) or die "bind: $!";
49 listen(Server,SOMAXCONN) or die "listen: $!";
52 open(PIDFILE,"<$pid_file");
53 my $old_pid = <PIDFILE>;
55 $old_pid =~ /^(\d+)$/;
58 open(PIDFILE,">$pid_file");
63 #sub REAPER { $waitedpid = wait; $SIG{CHLD} = \&REAPER; }
64 #$SIG{CHLD} = \&REAPER;
66 warn "entering main loop\n" if $Debug;
70 my $s = new IO::Select;
74 #for ( $waitedpid = 0;
75 # accept(Client,Server) || $waitedpid;
76 # $waitedpid = 0, close Client)
80 #$SIG{PIPE} = sub { warn "SIGPIPE received" };
81 #$SIG{CHLD} = sub { warn "SIGCHLD received" };
83 #sub REAPER { warn "SIGCHLD received"; my $pid = wait; $SIG{CHLD} = \&REAPER; }
84 #sub REAPER { my $pid = wait; $SIG{CHLD} = \&REAPER; }
85 #sub REAPER { my $pid = wait; delete $kids{$pid}; $SIG{CHLD} = \&REAPER; }
86 #$SIG{CHLD} = \&REAPER;
93 warn "waiting for connection\n" if $Debug && !$undisp;
95 #my @handles = $s->can_read();
96 my @handles = $s->can_read(5);
97 $undisp = !scalar(@handles);
98 foreach my $handle ( @handles ) {
100 if ( $handle == \*STDIN ) {
102 warn "receiving packet from server\n" if $Debug;
104 my $packet = fd_retrieve(\*STDIN);
105 my $token = $packet->{'_token'};
106 warn "received packet from server with token $token\n".
108 ? join('', map { " $_=>$packet->{$_}\n" } keys %$packet )
112 if ( exists($kids{$token}) ) {
113 warn "sending return packet to $token via $kids{$token}\n"
115 nstore_fd($packet, $kids{$token});
116 warn "flushing to $token\n" if $Debug;
117 until ( $kids{$token}->flush ) {
118 warn "WARNING: error flushing: $!";
121 #no close or delete here - will block waiting for child
122 warn "done with $token\n" if $Debug;
124 warn "WARNING: unknown token $token, discarding message";
127 } elsif ( $handle == \*Server ) {
129 until ( accept(Client, Server) ) {
130 warn "WARNING: accept failed: $!";
134 warn "received local connection; forking\n" if $Debug;
137 warn "[child-$$] reading packet from local client" if $Debug > 1;
138 my $packet = fd_retrieve(\*Client);
139 warn "[child-$$] packet received:\n".
140 join('', map { " $_=>$packet->{$_}\n" } keys %$packet )
142 my $command = $packet->{'command'};
143 #handle some commands weirdly?
144 $packet->{_token}=$$;
146 warn "[child-$$] locking write stream" if $Debug > 1;
149 warn "[child-$$] sending packet to remote server" if $Debug > 1;
150 nstore_fd($packet, \*STDOUT) or die "FATAL: can't send response: $!";
152 warn "[child-$$] flushing write stream" if $Debug > 1;
153 STDOUT->flush or die "FATAL: can't flush: $!";
155 warn "[child-$$] releasing write lock" if $Debug > 1;
158 warn "[child-$$] closing write stream" if $Debug > 1;
159 close STDOUT or die "FATAL: can't close write stream: $!"; #??!
161 warn "[child-$$] waiting for response from parent" if $Debug > 1;
162 my $w = new IO::Select;
164 until ( $w->can_read ) {
165 warn "[child-$$] WARNING: interrupted select: $!\n";
167 my $rv = fd_retrieve(\*STDIN);
171 warn "[child-$$] sending response to local client" if $Debug > 1;
172 nstore_fd($rv, \*Client);
173 Client->flush or die "FATAL: can't flush to local client: $!";
174 close Client or die "FATAL: can't close connection to local client: $!";
176 warn "[child-$$] child exiting" if $Debug > 1;
192 #warn "reaping kids\n";
193 foreach my $pid ( keys %kids ) {
194 my $kid = waitpid($pid, WNOHANG);
200 #warn "done reaping\n";
206 unless (@_ == 0 && $coderef && ref($coderef) eq 'CODE') {
208 confess "usage: spawn CODEREF";
212 #if (!defined($pid = fork)) {
213 my $kid = new IO::Handle;
214 if (!defined($pid = open($kid, '|-'))) {
215 warn "WARNING: cannot fork: $!";
218 warn "begat $pid" if $Debug;
220 #$kids{$pid}->autoflush;
221 return; # I'm the parent
223 # else I'm the child -- go spawn
225 # open(STDIN, "<&Client") || die "can't dup client to stdin";
226 # open(STDOUT, ">&Client") || die "can't dup client to stdout";
227 # open(STDERR, ">&STDOUT") || die "can't dup stdout to stderr";
232 chomp( my $msg = shift );
233 my $log = new IO::File ">>$log_file";
234 flock($log, LOCK_EX);
236 print $log "[client] [". scalar(localtime). "] [$$] $msg\n";
237 flock($log, LOCK_UN);
243 #flock(STDOUT, LOCK_EX) or die "FATAL: can't lock write stream: $!";
245 flock(LOCKFILE, LOCK_EX) or die "FATAL: can't lock $lock_file: $!";
250 #flock(STDOUT, LOCK_UN) or die "FATAL: can't release write lock: $!";
252 flock(LOCKFILE, LOCK_UN) or die "FATAL: can't unlock $lock_file: $!";