package SIPServer; use strict; use warnings; use FindBin qw($Bin); use lib "$Bin"; # use Exporter; use Sys::Syslog qw(syslog); use Net::Server::PreFork; use IO::Socket::INET; use Socket qw(:DEFAULT :crlf); use Data::Dumper; # For debugging require UNIVERSAL::require; #use Sip qw(readline); use Sip::Constants qw(:all); use Sip::Configuration; use Sip::Checksum qw(checksum verify_cksum); use Sip::MsgType; use constant LOG_SIP => "local6"; # Local alias for the logging facility use vars qw(@ISA $VERSION); BEGIN { $VERSION = 3.07.00.049; @ISA = qw(Net::Server::PreFork); } # # Main # not really, since package SIPServer # # FIXME: Is this a module or a script? # A script with no MAIN namespace? # A module that takes command line args? my %transports = ( RAW => \&raw_transport, telnet => \&telnet_transport, ); # # Read configuration # my $config = new Sip::Configuration $ARGV[0]; print STDERR "SIPServer config: \n" . Dumper($config) . "\nEND SIPServer config.\n"; my @parms; # # Ports to bind # foreach my $svc (keys %{$config->{listeners}}) { push @parms, "port=" . $svc; } # # Logging # # Log lines look like this: # Jun 16 21:21:31 server08 steve_sip[19305]: ILS::Transaction::Checkout performing checkout... # [ TIMESTAMP ] [ HOST ] [ IDENT ] PID : Message... # # The IDENT is determined by config file 'server-params' arguments # # Server Management: set parameters for the Net::Server::PreFork # module. The module silently ignores parameters that it doesn't # recognize, and complains about invalid values for parameters # that it does. # if (defined($config->{'server-params'})) { while (my ($key, $val) = each %{$config->{'server-params'}}) { push @parms, $key . '=' . $val; } } print scalar(localtime), " -- startup -- procid:$$\n"; print "Params for Net::Server::PreFork : \n" . Dumper(\@parms); # # This is the main event. __PACKAGE__ ->run(@parms); # # Child # # process_request is the callback used by Net::Server to handle # an incoming connection request. sub process_request { my $self = shift; my $service; my ($sockaddr, $port, $proto); my $transport; $self->{config} = $config; my $sockname = getsockname(STDIN); ($port, $sockaddr) = sockaddr_in($sockname); $sockaddr = inet_ntoa($sockaddr); $proto = $self->{server}->{client}->NS_proto(); $self->{service} = $config->find_service($sockaddr, $port, $proto); if (!defined($self->{service})) { syslog("LOG_ERR", "process_request: Unknown recognized server connection: %s:%s/%s", $sockaddr, $port, $proto); die "process_request: Bad server connection"; } $transport = $transports{$self->{service}->{transport}}; if (!defined($transport)) { syslog("LOG_WARNING", "Unknown transport '%s', dropping", $service->{transport}); return; } else { &$transport($self); } } # # Transports # sub raw_transport { my $self = shift; my ($input); my $service = $self->{service}; while (!$self->{account}) { local $SIG{ALRM} = sub { die "raw_transport Timed Out!\n"; }; syslog("LOG_DEBUG", "raw_transport: timeout is %d", $service->{timeout}); $input = Sip::read_SIP_packet(*STDIN); if (!$input) { # EOF on the socket syslog("LOG_INFO", "raw_transport: shutting down: EOF during login"); return; } $input =~ s/[\r\n]+$//sm; # Strip off trailing line terminator(s) last if Sip::MsgType::handle($input, $self, LOGIN); } syslog("LOG_DEBUG", "raw_transport: uname/inst: '%s/%s'", $self->{account}->{id}, $self->{account}->{institution}); $self->sip_protocol_loop(); syslog("LOG_INFO", "raw_transport: shutting down"); } sub get_clean_string { my $string = shift; if (defined $string) { syslog("LOG_DEBUG", "get_clean_string pre-clean(length %s): %s", length($string), $string); chomp($string); $string =~ s/^[^A-z0-9]+//; $string =~ s/[^A-z0-9]+$//; syslog("LOG_DEBUG", "get_clean_string post-clean(length %s): %s", length($string), $string); } else { syslog("LOG_INFO", "get_clean_string called on undefined"); } return $string; } sub get_clean_input { local $/ = "\012"; my $in = ; $in = get_clean_string($in); while (my $extra = ){ syslog("LOG_ERR", "get_clean_input got extra lines: %s", $extra); } return $in; } sub telnet_transport { my $self = shift; my ($uid, $pwd); my $strikes = 3; my $account = undef; my $input; my $config = $self->{config}; my $timeout = $self->{service}->{timeout} || $config->{timeout} || 30; syslog("LOG_DEBUG", "telnet_transport: timeout is %s", $timeout); eval { local $SIG{ALRM} = sub { die "telnet_transport: Timed Out ($timeout seconds)!\n"; }; local $| = 1; # Unbuffered output $/ = "\015"; # Internet Record Separator (lax version) # Until the terminal has logged in, we don't trust it # so use a timeout to protect ourselves from hanging. while ($strikes--) { print "login: "; alarm $timeout; # $uid = &get_clean_input; $uid = ; print "password: "; # $pwd = &get_clean_input || ''; $pwd = ; alarm 0; syslog("LOG_DEBUG", "telnet_transport 1: uid length %s, pwd length %s", length($uid), length($pwd)); $uid = get_clean_string ($uid); $pwd = get_clean_string ($pwd); syslog("LOG_DEBUG", "telnet_transport 2: uid length %s, pwd length %s", length($uid), length($pwd)); if (exists ($config->{accounts}->{$uid}) && ($pwd eq $config->{accounts}->{$uid}->password())) { $account = $config->{accounts}->{$uid}; Sip::MsgType::login_core($self,$uid,$pwd) and last; } syslog("LOG_WARNING", "Invalid login attempt: '%s'", ($uid||'')); print("Invalid login$CRLF"); } }; # End of eval if ($@) { syslog("LOG_ERR", "telnet_transport: Login timed out"); die "Telnet Login Timed out"; } elsif (!defined($account)) { syslog("LOG_ERR", "telnet_transport: Login Failed"); die "Login Failure"; } else { print "Login OK. Initiating SIP$CRLF"; } $self->{account} = $account; syslog("LOG_DEBUG", "telnet_transport: uname/inst: '%s/%s'", $account->{id}, $account->{institution}); $self->sip_protocol_loop(); syslog("LOG_INFO", "telnet_transport: shutting down"); } # # The terminal has logged in, using either the SIP login process # over a raw socket, or via the pseudo-unix login provided by the # telnet transport. From that point on, both the raw and the telnet # processes are the same: sub sip_protocol_loop { my $self = shift; my $service = $self->{service}; my $config = $self->{config}; my $input; # The spec says the first message will be: # SIP v1: SC_STATUS # SIP v2: LOGIN (or SC_STATUS via telnet?) # But it might be SC_REQUEST_RESEND. As long as we get # SC_REQUEST_RESEND, we keep waiting. # Comprise reports that no other ILS actually enforces this # constraint, so we'll relax about it too. # Using the SIP "raw" login process, rather than telnet, # requires the LOGIN message and forces SIP 2.00. In that # case, the LOGIN message has already been processed (above). # # In short, we'll take any valid message here. #my $expect = SC_STATUS; my $expect = ''; while (1) { $input = Sip::read_SIP_packet(*STDIN); unless ($input) { return; # EOF } # begin input hacks ... a cheap stand in for better Telnet layer $input =~ s/^[^A-z0-9]+//s; # Kill leading bad characters... like Telnet handshakers $input =~ s/[^A-z0-9]+$//s; # Same on the end, should get DOSsy ^M line-endings too. while (chomp($input)) {warn "Extra line ending on input";} unless ($input) { syslog("LOG_ERR", "sip_protocol_loop: empty input skipped"); print("96$CR"); next; } # end cheap input hacks my $status = Sip::MsgType::handle($input, $self, $expect); if (!$status) { syslog("LOG_ERR", "sip_protocol_loop: failed to handle %s",substr($input,0,2)); } next if $status eq REQUEST_ACS_RESEND; if ($expect && ($status ne $expect)) { # We received a non-"RESEND" that wasn't what we were expecting. syslog("LOG_ERR", "sip_protocol_loop: expected %s, received %s, exiting", $expect, $input); } # We successfully received and processed what we were expecting $expect = ''; } } 1; __END__