2 # Copyright (C) 2006-2008 Georgia Public Library Service
4 # Author: David J. Fiander
6 # This program is free software; you can redistribute it and/or
7 # modify it under the terms of version 2 of the GNU General Public
8 # License as published by the Free Software Foundation.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public
16 # License along with this program; if not, write to the Free
17 # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
25 use Sys::Syslog qw(syslog);
26 use Net::Server::PreFork;
27 use Net::Server::Proto;
29 use Socket qw(:crlf SOL_SOCKET SO_KEEPALIVE IPPROTO_TCP TCP_KEEPALIVE);
30 use Data::Dumper; # For debugging
31 require UNIVERSAL::require;
33 #use Sip qw(readline);
34 use Sip::Constants qw(:all);
35 use Sip::Configuration;
36 use Sip::Checksum qw(checksum verify_cksum);
39 use constant LOG_SIP => "local6"; # Local alias for the logging facility
42 our @ISA = qw(Net::Server::PreFork);
48 RAW => \&raw_transport,
49 telnet => \&telnet_transport,
50 http => \&http_transport,
55 my $config = Sip::Configuration->new($ARGV[0]);
62 foreach my $svc (keys %{$config->{listeners}}) {
63 push @parms, "port=" . $svc;
69 # Log lines look like this:
70 # Jun 16 21:21:31 server08 steve_sip: Sip::MsgType::_initialize('Login', ...)
71 # [ TIMESTAMP ] [ HOST ] [ IDENT ]: Message...
73 # The IDENT is determined by $ENV{SIP_LOG_IDENT}, if present.
74 # Otherwise it is "_sip" appended to $USER, if present, or "acs-server" as a fallback.
77 my $syslog_ident = $ENV{SIP_LOG_IDENT} || ($ENV{USER} ? $ENV{USER} . "_sip" : 'acs-server');
80 "log_file=Sys::Syslog",
81 "syslog_ident=$syslog_ident",
82 "syslog_facility=" . LOG_SIP;
85 # Server Management: set parameters for the Net::Server::PreFork
86 # module. The module silently ignores parameters that it doesn't
87 # recognize, and complains about invalid values for parameters
90 if (defined($config->{'server-params'})) {
91 while (my ($key, $val) = each %{$config->{'server-params'}}) {
92 push @parms, $key . '=' . $val;
99 # This is the main event.
100 SIPServer->run(@parms);
106 # process_request is the callback used by Net::Server to handle
107 # an incoming connection request.
109 sub process_request {
113 my ($sockaddr, $port, $proto);
116 # This is kind of kinky, but allows us to avoid requiring Socket::Linux.
117 # A simple "Socket::Linux"->use won't suffice since we need access to
118 # all of it's bareword constants as well.
120 use Socket::Linux qw(TCP_KEEPINTVL TCP_KEEPIDLE TCP_KEEPCNT);
121 setsockopt($self->{server}->{client}, SOL_SOCKET, SO_KEEPALIVE, 1);
122 setsockopt($self->{server}->{client}, IPPROTO_TCP, TCP_KEEPIDLE, 120);
123 setsockopt($self->{server}->{client}, IPPROTO_TCP, TCP_KEEPINTVL, 10);
127 "Consider installing Socket::Linux for TCP keepalive: $@") if $@;
129 $self->{account} = undef; # New connection, no need to keep login info
130 $self->{config} = $config;
132 $sockaddr = $self->{server}->{sockaddr};
133 $port = $self->{server}->{sockport};
134 $proto = $self->{server}->{client}->NS_proto();
135 syslog('LOG_INFO', "Inbound connection from $sockaddr on port $port and proto $proto");
137 $self->{service} = $config->find_service( $sockaddr, $port, $proto );
139 if (! defined($self->{service})) {
140 syslog( "LOG_ERR", "process_request: Unrecognized server connection: %s:%s/%s",
141 $sockaddr, $port, $proto );
142 die "process_request: Bad server connection";
145 $transport = $transports{ $self->{service}->{transport} };
147 if ( !defined($transport) ) {
148 syslog("LOG_WARNING", "Unknown transport '%s', dropping", $service->{transport});
152 # Transport has shut down, remove any lingering login info
153 $self->{account} = undef;
156 $self->sip_protocol_loop();
158 syslog("LOG_INFO", '%s: shutting down', $transport);
169 my $service = $self->{service};
172 my $timeout = $self->{service}->{timeout} || $self->{config}->{timeout} || 0;
175 local $SIG{ALRM} = sub { die "raw_transport Timed Out!\n"; };
176 syslog("LOG_DEBUG", "raw_transport: timeout is $timeout");
180 $input = Sip::read_SIP_packet(*STDIN);
185 syslog("LOG_INFO", "raw_transport: shutting down: EOF during login");
187 } elsif ($input !~ /\S/) {
188 syslog("LOG_INFO", "raw_transport: received whitespace line (length %s) during login, skipping", length($input));
191 $input =~ s/[\r\n]+$//sm; # Strip off trailing line terminator
192 if ($input =~ /^99/) { # SC Status
193 unless ($service->allow_sc_status_then_login()) {
194 die 'raw_transport: sending SC status before login not enabled, exiting';
196 Sip::MsgType::handle($input, $self, SC_STATUS);
199 last if Sip::MsgType::handle($input, $self, LOGIN);
204 syslog("LOG_ERR", "raw_transport: LOGIN ERROR: '$@'");
205 die "raw_transport: login error (timeout? $@), exiting";
206 } elsif (!$self->{account}) {
207 syslog("LOG_ERR", "raw_transport: LOGIN FAILED");
208 die "raw_transport: Login failed (no account), exiting";
211 syslog("LOG_DEBUG", "raw_transport: uname/inst: '%s/%s'",
212 $self->{account}->{id},
213 $self->{account}->{institution});
217 sub telnet_transport {
223 my $config = $self->{config};
224 my $timeout = $self->{service}->{timeout} || $config->{timeout} || 0;
225 syslog("LOG_DEBUG", "telnet_transport: timeout is %s", $timeout);
227 # Until the terminal has logged in, we don't trust it
228 # so use a timeout to protect ourselves from hanging.
230 local $SIG{ALRM} = sub { die "telnet_transport: Timed Out ($timeout seconds)!\n";; };
231 local $| = 1; # Unbuffered output
244 $uid =~ s/[\r\n]+$//;
245 $pwd =~ s/[\r\n]+$//;
247 if (exists($config->{accounts}->{$uid})
248 && ($pwd eq $config->{accounts}->{$uid}->password())) {
249 $account = $config->{accounts}->{$uid};
252 syslog("LOG_WARNING", "Invalid login attempt: '%s'", $uid);
253 print("Invalid login$CRLF");
259 syslog("LOG_ERR", "telnet_transport: Login timed out");
260 die "Telnet Login Timed out";
261 } elsif (!defined($account)) {
262 syslog("LOG_ERR", "telnet_transport: Login Failed");
265 print "Login OK. Initiating SIP$CRLF";
268 $self->{account} = $account;
269 syslog("LOG_DEBUG", "telnet_transport: uname/inst: '%s/%s'", $account->{id}, $account->{institution});
277 # The terminal has logged in, using either the SIP login process
278 # over a raw socket, or via the pseudo-unix login provided by the
279 # telnet transport. From that point on, both the raw and the telnet
280 # processes are the same:
281 sub sip_protocol_loop {
284 my $service = $self->{service};
285 my $config = $self->{config};
287 my $timeout = $self->{service}->{timeout} || $config->{timeout} || 0;
289 # Now that the terminal has logged in, the first message
290 # we recieve must be an SC_STATUS message. But it might be
291 # an SC_REQUEST_RESEND. So, as long as we keep receiving
292 # SC_REQUEST_RESEND, we keep waiting for an SC_STATUS
294 # Comprise reports that no other ILS actually enforces this
295 # constraint, so we'll relax about it too. As long as everybody
296 # uses the SIP "raw" login process, rather than telnet, this
297 # will be fine, becaues the LOGIN protocol exchange will force
298 # us into SIP 2.00 anyway. Machines that want to log in using
299 # telnet MUST send an SC Status message first, even though we're
302 #$expect = SC_STATUS;
305 alarm $timeout; # First loop timeout
306 while ( $input = Sip::read_SIP_packet(*STDIN) ) {
307 alarm 0; # Don't timeout while we are processing
308 $input =~ s/[\r\n]+$//sm; # Strip off any trailing line ends
310 my $status = Sip::MsgType::handle($input, $self, $expect);
311 next if $status eq REQUEST_ACS_RESEND;
314 syslog("LOG_ERR", "raw_transport: failed to handle %s", substr($input,0,2));
315 die "sip_protocol_loop: failed Sip::MsgType::handle('$input', $self, '$expect')";
317 elsif ($expect && ($status ne $expect)) {
318 # We received a non-"RESEND" that wasn't what we were expecting.
319 syslog("LOG_ERR", "raw_transport: expected %s, received %s, exiting", $expect, $input);
320 die "sip_protocol_loop: exiting: expected '$expect', received '$status'";
323 # We successfully received and processed what we were expecting
325 alarm $timeout; # Next loop timeout