Koha/C4/SIP/SIPServer.pm
Joe Atzberger 68cdeccfe7 SIPServer.pm - BEGIN block VERSION and vars related to export.
Signed-off-by: Chris Cormack <crc@liblime.com>
Signed-off-by: Joshua Ferraro <jmf@liblime.com>
2008-01-07 20:02:42 -06:00

279 lines
6.7 KiB
Perl

package SIPServer;
use strict;
use warnings;
use Exporter;
use Sys::Syslog qw(syslog);
use Net::Server::PreFork;
use IO::Socket::INET;
use Socket;
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 = 1.00;
@ISA = qw(Net::Server::PreFork);
}
#
# Main
#
my %transports = (
RAW => \&raw_transport,
telnet => \&telnet_transport,
http => \&http_transport,
);
# Read configuration
my $config = new Sip::Configuration $ARGV[0];
my @parms;
#
# Ports to bind
#
foreach my $svc (keys %{$config->{listeners}}) {
push @parms, "port=" . $svc;
}
#
# Logging
#
push @parms, "log_file=Sys::Syslog", "syslog_ident=acs-server",
"syslog_facility=" . LOG_SIP;
#
# Server Management: set parameters for the Net::Server::PreFork
# module. The module silently ignores parameters that it doesn't
# recognize, and complains about invalid values for parameters
# that it does.
#
if (defined($config->{'server-params'})) {
while (my ($key, $val) = each %{$config->{'server-params'}}) {
push @parms, $key . '=' . $val;
}
}
print Dumper(@parms);
#
# This is the main event.
SIPServer->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 $sockname;
my ($sockaddr, $port, $proto);
my $transport;
$self->{config} = $config;
$sockname = getsockname(STDIN);
($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_WARN", "Unknown transport '%s', dropping", $service->{transport});
return;
} else {
&$transport($self);
}
}
#
# Transports
#
sub raw_transport {
my $self = shift;
my ($uid, $pwd);
my $input;
my $service = $self->{service};
my $strikes = 3;
my $expect;
my $inst;
eval {
local $SIG{ALRM} = sub { die "alarm\n"; };
syslog("LOG_DEBUG", "raw_transport: timeout is %d",
$service->{timeout});
while ($strikes--) {
alarm $service->{timeout};
$input = Sip::read_SIP_packet(*STDIN);
alarm 0;
if (!$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
last if Sip::MsgType::handle($input, $self, LOGIN);
}
};
if ($@) {
syslog("LOG_ERR", "raw_transport: LOGIN ERROR: '$@'");
die "raw_transport: login error, exiting";
} elsif (!$self->{account}) {
syslog("LOG_ERR", "raw_transport: LOGIN FAILED");
die "raw_transport: Login failed, exiting";
}
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 telnet_transport {
my $self = shift;
my ($uid, $pwd);
my $strikes = 3;
my $account = undef;
my $input;
my $config = $self->{config};
# Until the terminal has logged in, we don't trust it
# so use a timeout to protect ourselves from hanging.
eval {
local $SIG{ALRM} = sub { die "alarm\n"; };
local $|;
my $timeout = 0;
$| = 1; # Unbuffered output
$timeout = $config->{timeout} if (exists($config->{timeout}));
while ($strikes--) {
print "login: ";
alarm $timeout;
$uid = <STDIN>;
alarm 0;
print "password: ";
alarm $timeout;
$pwd = <STDIN>;
alarm 0;
$uid =~ s/[\r\n]+$//;
$pwd =~ s/[\r\n]+$//;
if (exists($config->{accounts}->{$uid})
&& ($pwd eq $config->{accounts}->{$uid}->password())) {
$account = $config->{accounts}->{$uid};
last;
} else {
syslog("LOG_WARNING", "Invalid login attempt: '%s'", $uid);
print("Invalid login\n");
}
}
}; # End of eval
if ($@) {
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\n";
}
$self->{account} = $account;
$self->sip_protocol_loop();
syslog("LOG_INFO", "telnet_transport: shutting down");
}
sub http_transport {
}
#
# 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 $expect;
my $service = $self->{service};
my $config = $self->{config};
my $input;
# Now that the terminal has logged in, the first message
# we recieve must be an SC_STATUS message. But it might be
# an SC_REQUEST_RESEND. So, as long as we keep receiving
# SC_REQUEST_RESEND, we keep waiting for an SC_STATUS
# Comprise reports that no other ILS actually enforces this
# constraint, so we'll relax about it too. As long as everybody
# uses the SIP "raw" login process, rather than telnet, this
# will be fine, becaues the LOGIN protocol exchange will force
# us into SIP 2.00 anyway. Machines that want to log in using
# telnet MUST send an SC Status message first, even though we're
# not enforcing it.
#
#$expect = SC_STATUS;
$expect = '';
while ($input = Sip::read_SIP_packet(*STDIN)) {
my $status;
$input =~ s/[\r\n]+$//sm; # Strip off any trailing line ends
$status = Sip::MsgType::handle($input, $self, $expect);
next if $status eq REQUEST_ACS_RESEND;
#### stopped here rch
if (!$status) {
syslog("LOG_ERR", "raw_transport: failed to handle %s",
substr($input, 0, 2));
die "raw_transport: dying";
} elsif ($expect && ($status ne $expect)) {
# We received a non-"RESEND" that wasn't what we were
# expecting.
syslog("LOG_ERR",
"raw_transport: expected %s, received %s, exiting",
$expect, $input);
die "raw_transport: exiting: expected '$expect', received '$status'";
}
# We successfully received and processed what we were expecting
# to receive
$expect = '';
}
}
1;
__END__