2 package C4::SIP::SIPServer;
8 use Net::Server::PreFork;
10 use Socket qw(:DEFAULT :crlf);
11 use Scalar::Util qw(blessed);
12 require UNIVERSAL::require;
15 use C4::SIP::Sip qw(syslog);
16 use C4::SIP::Sip::Constants qw(:all);
17 use C4::SIP::Sip::Configuration;
18 use C4::SIP::Sip::Checksum qw(checksum verify_cksum);
19 use C4::SIP::Sip::MsgType qw( handle login_core );
23 tie *STDERR, "C4::SIP::Trapper";
25 use base qw(Net::Server::PreFork);
27 use constant LOG_SIP => "local6"; # Local alias for the logging facility
30 # Main # not really, since package SIPServer
32 # FIXME: Is this a module or a script?
33 # A script with no MAIN namespace?
34 # A module that takes command line args?
36 # Set interface to 'sip'
37 C4::Context->interface('sip');
40 RAW => \&raw_transport,
41 telnet => \&telnet_transport,
47 my $config = C4::SIP::Sip::Configuration->new( $ARGV[0] );
53 foreach my $svc (keys %{$config->{listeners}}) {
54 push @parms, "port=" . $svc;
60 # Log lines look like this:
61 # Jun 16 21:21:31 server08 steve_sip[19305]: ILS::Transaction::Checkout performing checkout...
62 # [ TIMESTAMP ] [ HOST ] [ IDENT ] PID : Message...
64 # The IDENT is determined by config file 'server-params' arguments
68 # Server Management: set parameters for the Net::Server::PreFork
69 # module. The module silently ignores parameters that it doesn't
70 # recognize, and complains about invalid values for parameters
73 if (defined($config->{'server-params'})) {
74 while (my ($key, $val) = each %{$config->{'server-params'}}) {
75 push @parms, $key . '=' . $val;
81 # This is the main event.
82 __PACKAGE__ ->run(@parms);
91 # process_request is the callback used by Net::Server to handle
92 # an incoming connection request.
97 my ($sockaddr, $port, $proto);
100 $self->{config} = $config;
102 $self->{account} = undef; # Clear out the account from the last request, it may be different
103 $self->{logger} = _set_logger( Koha::Logger->get( { interface => 'sip' } ) );
105 # Flush previous MDCs to prevent accidentally leaking incorrect MDC-entries
106 Log::Log4perl::MDC->put( "accountid", undef );
107 Log::Log4perl::MDC->put( "peeraddr", undef );
109 my $sockname = getsockname(STDIN);
111 # Check if socket connection is IPv6 before resolving address
112 my $family = Socket::sockaddr_family($sockname);
113 if ($family == AF_INET6) {
114 ($port, $sockaddr) = sockaddr_in6($sockname);
115 $sockaddr = Socket::inet_ntop(AF_INET6, $sockaddr);
117 ($port, $sockaddr) = sockaddr_in($sockname);
118 $sockaddr = inet_ntoa($sockaddr);
120 $proto = $self->{server}->{client}->NS_proto();
122 $self->{service} = $config->find_service($sockaddr, $port, $proto);
124 if (!defined($self->{service})) {
125 syslog("LOG_ERR", "process_request: Unknown recognized server connection: %s:%s/%s", $sockaddr, $port, $proto);
126 die "process_request: Bad server connection";
129 $transport = $transports{$self->{service}->{transport}};
131 if (!defined($transport)) {
132 syslog("LOG_WARNING", "Unknown transport '%s', dropping", $service->{transport});
147 my $service = $self->{service};
148 # If using Net::Server::PreFork you may already have account set from a previous session
150 if ($self->{account}) {
151 delete $self->{account};
154 # Timeout the while loop if we get stuck in it
155 # In practice it should only iterate once but be prepared
156 local $SIG{ALRM} = sub { die 'raw transport Timed Out!' };
157 my $timeout = $self->get_timeout({ transport => 1 });
158 syslog('LOG_DEBUG', "raw_transport: timeout is $timeout");
160 while (!$self->{account}) {
161 $input = read_request();
164 syslog("LOG_INFO", "raw_transport: shutting down: EOF during login");
167 $input =~ s/[\r\n]+$//sm; # Strip off trailing line terminator(s)
168 my $reg = qr/^${\(LOGIN)}/;
169 last if $input !~ $reg ||
170 C4::SIP::Sip::MsgType::handle($input, $self, LOGIN);
174 $self->{logger} = _set_logger(
178 category => $self->{account}->{id}, # Add id to namespace
183 # Set MDCs after properly authenticating
184 Log::Log4perl::MDC->put( "accountid", $self->{account}->{id} );
185 Log::Log4perl::MDC->put( "peeraddr", $self->{server}->{peeraddr} );
187 syslog("LOG_DEBUG", "raw_transport: uname/inst: '%s/%s'",
188 $self->{account}->{id},
189 $self->{account}->{institution});
190 if (! $self->{account}->{id}) {
191 syslog("LOG_ERR","Login failed shutting down");
195 $self->sip_protocol_loop();
196 syslog("LOG_INFO", "raw_transport: shutting down");
200 sub get_clean_string {
202 if (defined $string) {
203 syslog("LOG_DEBUG", "get_clean_string pre-clean(length %s): %s", length($string), $string);
205 $string =~ s/^[^A-z0-9]+//;
206 $string =~ s/[^A-z0-9]+$//;
207 syslog("LOG_DEBUG", "get_clean_string post-clean(length %s): %s", length($string), $string);
209 syslog("LOG_INFO", "get_clean_string called on undefined");
214 sub get_clean_input {
217 $in = get_clean_string($in);
218 while (my $extra = <STDIN>){
219 syslog("LOG_ERR", "get_clean_input got extra lines: %s", $extra);
224 sub telnet_transport {
230 my $config = $self->{config};
231 my $timeout = $self->get_timeout({ transport => 1 });
232 syslog("LOG_DEBUG", "telnet_transport: timeout is $timeout");
235 local $SIG{ALRM} = sub { die "telnet_transport: Timed Out ($timeout seconds)!\n"; };
236 local $| = 1; # Unbuffered output
237 $/ = "\015"; # Internet Record Separator (lax version)
238 # Until the terminal has logged in, we don't trust it
239 # so use a timeout to protect ourselves from hanging.
244 # $uid = &get_clean_input;
247 # $pwd = &get_clean_input || '';
251 syslog("LOG_DEBUG", "telnet_transport 1: uid length %s, pwd length %s", length($uid), length($pwd));
252 $uid = get_clean_string ($uid);
253 $pwd = get_clean_string ($pwd);
254 syslog("LOG_DEBUG", "telnet_transport 2: uid length %s, pwd length %s", length($uid), length($pwd));
256 if (exists ($config->{accounts}->{$uid})
257 && ($pwd eq $config->{accounts}->{$uid}->{password})) {
258 $account = $config->{accounts}->{$uid};
259 if ( C4::SIP::Sip::MsgType::login_core($self,$uid,$pwd) ) {
263 syslog("LOG_WARNING", "Invalid login attempt: '%s'", ($uid||''));
264 print("Invalid login$CRLF");
269 syslog("LOG_ERR", "telnet_transport: Login timed out");
270 die "Telnet Login Timed out";
271 } elsif (!defined($account)) {
272 syslog("LOG_ERR", "telnet_transport: Login Failed");
275 print "Login OK. Initiating SIP$CRLF";
278 $self->{account} = $account;
279 syslog("LOG_DEBUG", "telnet_transport: uname/inst: '%s/%s'", $account->{id}, $account->{institution});
280 $self->sip_protocol_loop();
281 syslog("LOG_INFO", "telnet_transport: shutting down");
286 # The terminal has logged in, using either the SIP login process
287 # over a raw socket, or via the pseudo-unix login provided by the
288 # telnet transport. From that point on, both the raw and the telnet
289 # processes are the same:
290 sub sip_protocol_loop {
292 my $service = $self->{service};
293 my $config = $self->{config};
294 my $timeout = $self->get_timeout({ client => 1 });
296 # The spec says the first message will be:
298 # SIP v2: LOGIN (or SC_STATUS via telnet?)
299 # But it might be SC_REQUEST_RESEND. As long as we get
300 # SC_REQUEST_RESEND, we keep waiting.
302 # Comprise reports that no other ILS actually enforces this
303 # constraint, so we'll relax about it too.
304 # Using the SIP "raw" login process, rather than telnet,
305 # requires the LOGIN message and forces SIP 2.00. In that
306 # case, the LOGIN message has already been processed (above).
308 # In short, we'll take any valid message here.
310 local $SIG{ALRM} = sub {
311 syslog( 'LOG_DEBUG', 'Inactive: timed out' );
314 my $previous_alarm = alarm($timeout);
316 while ( my $inputbuf = read_request() ) {
317 if ( !defined $inputbuf ) {
323 syslog( "LOG_ERR", "sip_protocol_loop: empty input skipped" );
328 my $status = C4::SIP::Sip::MsgType::handle( $inputbuf, $self, q{} );
332 "sip_protocol_loop: failed to handle %s",
333 substr( $inputbuf, 0, 2 )
336 next if $status eq REQUEST_ACS_RESEND;
338 alarm($previous_alarm);
341 if ( $@ =~ m/timed out/i ) {
351 # proper SPEC: (octal) \015 = (hex) x0D = (dec) 13 = (ascii) carriage return
352 my $buffer = <STDIN>;
353 if ( defined $buffer ) {
354 STDIN->flush(); # clear an extra linefeed
356 $raw_length = length $buffer;
357 $buffer =~ s/^\s*[^A-z0-9]+//s;
358 # Every line must start with a "real" character. Not whitespace, control chars, etc.
359 $buffer =~ s/[^A-z0-9]+$//s;
361 # Same for the end. Note this catches the problem some clients have sending empty fields at the end, like |||
362 $buffer =~ s/\015?\012//g; # Extra line breaks must die
363 $buffer =~ s/\015?\012//s; # Extra line breaks must die
364 $buffer =~ s/\015*\012*$//s;
366 # treat as one line to include the extra linebreaks we are trying to remove!
369 syslog( 'LOG_DEBUG', 'EOF returned on read' );
372 my $len = length $buffer;
373 if ( $len != $raw_length ) {
374 my $trim = $raw_length - $len;
375 syslog( 'LOG_DEBUG', "read_request trimmed $trim character(s) " );
378 syslog( 'LOG_INFO', "INPUT MSG: '$buffer'" );
382 # $server->get_timeout({ $type => 1, fallback => $fallback });
383 # where $type is transport | client | policy
385 # Centralizes all timeout logic.
386 # Transport refers to login process, client to active connections.
387 # Policy timeout is transaction timeout (used in ACS status message).
389 # Fallback is optional. If you do not pass transport, client or policy,
390 # you will get fallback or hardcoded default.
393 my ( $server, $params ) = @_;
394 my $fallback = $params->{fallback} || 30;
395 my $service = $server->{service} // {};
396 my $config = $server->{config} // {};
398 if( $params->{transport} ||
399 ( $params->{client} && !exists $service->{client_timeout} )) {
400 # We do not allow zero values here.
401 # Note: config/timeout seems to be deprecated.
402 return $service->{timeout} || $config->{timeout} || $fallback;
404 } elsif( $params->{client} ) {
405 # We know that client_timeout exists now.
406 # We do allow zero values here to indicate no timeout.
407 return 0 if $service->{client_timeout} =~ /^0+$|\D/;
408 return $service->{client_timeout};
410 } elsif( $params->{policy} ) {
411 my $policy = $server->{policy} // {};
412 my $rv = sprintf( "%03d", $policy->{timeout} // 0 );
413 if( length($rv) != 3 ) {
414 syslog( "LOG_ERR", "Policy timeout has wrong size: '%s'", $rv );
426 my $sipServer = C4::SIP::SIPServer::get_SIPServer()
428 @RETURNS C4::SIP::SIPServer, the current server's child-process used to handle this SIP-transaction
433 unless($activeSIPServer) {
435 die "$cc[3]() asks for \$activeSIPServer, but he is not defined yet";
437 return $activeSIPServer;
441 my ($sipServer) = @_;
442 unless (blessed($sipServer) && $sipServer->isa('C4::SIP::SIPServer')) {
444 die "$cc[3]():> \$sipServer '$sipServer' is not a C4::SIP::SIPServer-object";
446 $activeSIPServer = $sipServer;
447 return $activeSIPServer;
452 my $logger = C4::SIP::SIPServer::get_logger()
454 @RETURNS Koha::Logger, the logger used to log this SIP-transaction
459 unless($activeLogger) {
461 die "$cc[3]() asks for \$activeLogger, but he is not defined yet";
463 return $activeLogger;
468 unless (blessed($logger) && $logger->isa('Koha::Logger')) {
470 die "$cc[3]():> \$logger '$logger' is not a Koha::Logger-object";
472 $activeLogger = $logger;
473 return $activeLogger;