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Koha/C4/SIP/SIPServer.pm
Colin Campbell dfe3753dee Bug 28054: Reinstate the shebang in SIPServer.pm 
Bug 26673 renoved the shebang from SIPServer.pm. This was an error
SIPServer.pm is a program not a perl module, and needs the shebang
for the OS to assign an interpreter unless the command line
calls it as an argument to perl. Restore the shebang

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
2021-04-01 18:51:37 +02:00

422 lines
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Perl
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#!/usr/bin/perl
package C4::SIP::SIPServer;
use strict;
use warnings;
use FindBin qw($Bin);
use lib "$Bin";
use Net::Server::PreFork;
use IO::Socket::INET;
use Socket qw(:DEFAULT :crlf);
use Scalar::Util qw(blessed);
require UNIVERSAL::require;
use C4::Context;
use C4::SIP::Sip qw(siplog);
use C4::SIP::Sip::Constants qw(:all);
use C4::SIP::Sip::Configuration;
use C4::SIP::Sip::Checksum qw(checksum verify_cksum);
use C4::SIP::Sip::MsgType qw( handle login_core );
use C4::SIP::Logger qw(set_logger);
use Koha::Caches;
use Koha::Logger;
use C4::SIP::Trapper;
tie *STDERR, "C4::SIP::Trapper";
use base qw(Net::Server::PreFork);
use constant LOG_SIP => "local6"; # Local alias for the logging facility
#
# 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?
# Set interface to 'sip'
C4::Context->interface('sip');
my %transports = (
RAW => \&raw_transport,
telnet => \&telnet_transport,
);
#
# Read configuration
#
my $config = C4::SIP::Sip::Configuration->new( $ARGV[0] );
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;
}
}
#
# 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;
# Flushing L1 to make sure the request will be processed using the correct data
Koha::Caches->flush_L1_caches();
$self->{account} = undef; # Clear out the account from the last request, it may be different
$self->{logger} = set_logger( Koha::Logger->get( { interface => 'sip' } ) );
my $sockname = getsockname(STDIN);
# Check if socket connection is IPv6 before resolving address
my $family = Socket::sockaddr_family($sockname);
if ($family == AF_INET6) {
($port, $sockaddr) = sockaddr_in6($sockname);
$sockaddr = Socket::inet_ntop(AF_INET6, $sockaddr);
} else {
($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})) {
siplog("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)) {
siplog("LOG_WARNING", "Unknown transport '%s', dropping", $service->{transport});
return;
} else {
&$transport($self);
}
return;
}
#
# Transports
#
sub raw_transport {
my $self = shift;
my $input;
my $service = $self->{service};
# If using Net::Server::PreFork you may already have account set from a previous session
# Ensure you dont
if ($self->{account}) {
delete $self->{account};
}
# Timeout the while loop if we get stuck in it
# In practice it should only iterate once but be prepared
local $SIG{ALRM} = sub { die 'raw transport Timed Out!' };
my $timeout = $self->get_timeout({ transport => 1 });
siplog('LOG_DEBUG', "raw_transport: timeout is $timeout");
alarm $timeout;
while (!$self->{account}) {
$input = read_request();
if (!$input) {
# EOF on the socket
siplog("LOG_INFO", "raw_transport: shutting down: EOF during login");
return;
}
$input =~ s/[\r\n]+$//sm; # Strip off trailing line terminator(s)
my $reg = qr/^${\(LOGIN)}/;
last if $input !~ $reg ||
C4::SIP::Sip::MsgType::handle($input, $self, LOGIN);
}
alarm 0;
$self->{logger} = set_logger(
Koha::Logger->get(
{
interface => 'sip',
category => $self->{account}->{id}, # Add id to namespace
}
)
);
siplog("LOG_DEBUG", "raw_transport: uname/inst: '%s/%s'",
$self->{account}->{id},
$self->{account}->{institution});
if (! $self->{account}->{id}) {
siplog("LOG_ERR","Login failed shutting down");
return;
}
$self->sip_protocol_loop();
siplog("LOG_INFO", "raw_transport: shutting down");
return;
}
sub get_clean_string {
my $string = shift;
if (defined $string) {
siplog("LOG_DEBUG", "get_clean_string pre-clean(length %s): %s", length($string), $string);
chomp($string);
$string =~ s/^[^A-z0-9]+//;
$string =~ s/[^A-z0-9]+$//;
siplog("LOG_DEBUG", "get_clean_string post-clean(length %s): %s", length($string), $string);
} else {
siplog("LOG_INFO", "get_clean_string called on undefined");
}
return $string;
}
sub get_clean_input {
local $/ = "\012";
my $in = <STDIN>;
$in = get_clean_string($in);
while (my $extra = <STDIN>){
siplog("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->get_timeout({ transport => 1 });
siplog("LOG_DEBUG", "telnet_transport: timeout is $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 = <STDIN>;
print "password: ";
# $pwd = &get_clean_input || '';
$pwd = <STDIN>;
alarm 0;
siplog("LOG_DEBUG", "telnet_transport 1: uid length %s, pwd length %s", length($uid), length($pwd));
$uid = get_clean_string ($uid);
$pwd = get_clean_string ($pwd);
siplog("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};
if ( C4::SIP::Sip::MsgType::login_core($self,$uid,$pwd) ) {
last;
}
}
siplog("LOG_WARNING", "Invalid login attempt: '%s'", ($uid||''));
print("Invalid login$CRLF");
}
}; # End of eval
if ($@) {
siplog("LOG_ERR", "telnet_transport: Login timed out");
die "Telnet Login Timed out";
} elsif (!defined($account)) {
siplog("LOG_ERR", "telnet_transport: Login Failed");
die "Login Failure";
} else {
print "Login OK. Initiating SIP$CRLF";
}
$self->{account} = $account;
siplog("LOG_DEBUG", "telnet_transport: uname/inst: '%s/%s'", $account->{id}, $account->{institution});
$self->sip_protocol_loop();
siplog("LOG_INFO", "telnet_transport: shutting down");
return;
}
#
# 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 $timeout = $self->get_timeout({ client => 1 });
# 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.
eval {
local $SIG{ALRM} = sub {
siplog( 'LOG_DEBUG', 'Inactive: timed out' );
die "Timed Out!\n";
};
my $previous_alarm = alarm($timeout);
while ( my $inputbuf = read_request() ) {
if ( !defined $inputbuf ) {
return; #EOF
}
alarm($timeout);
unless ($inputbuf) {
siplog( "LOG_ERR", "sip_protocol_loop: empty input skipped" );
print("96$CR");
next;
}
my $status = C4::SIP::Sip::MsgType::handle( $inputbuf, $self, q{} );
if ( !$status ) {
siplog(
"LOG_ERR",
"sip_protocol_loop: failed to handle %s",
substr( $inputbuf, 0, 2 )
);
}
next if $status eq REQUEST_ACS_RESEND;
}
alarm($previous_alarm);
return;
};
if ( $@ =~ m/timed out/i ) {
return;
}
return;
}
sub read_request {
my $raw_length;
local $/ = "\015";
# proper SPEC: (octal) \015 = (hex) x0D = (dec) 13 = (ascii) carriage return
my $buffer = <STDIN>;
if ( defined $buffer ) {
STDIN->flush(); # clear an extra linefeed
chomp $buffer;
$raw_length = length $buffer;
$buffer =~ s/^\s*[^A-z0-9]+//s;
# Every line must start with a "real" character. Not whitespace, control chars, etc.
$buffer =~ s/[^A-z0-9]+$//s;
# Same for the end. Note this catches the problem some clients have sending empty fields at the end, like |||
$buffer =~ s/\015?\012//g; # Extra line breaks must die
$buffer =~ s/\015?\012//s; # Extra line breaks must die
$buffer =~ s/\015*\012*$//s;
# treat as one line to include the extra linebreaks we are trying to remove!
}
else {
siplog( 'LOG_DEBUG', 'EOF returned on read' );
return;
}
my $len = length $buffer;
if ( $len != $raw_length ) {
my $trim = $raw_length - $len;
siplog( 'LOG_DEBUG', "read_request trimmed $trim character(s) " );
}
siplog( 'LOG_INFO', "INPUT MSG: '$buffer'" );
return $buffer;
}
# $server->get_timeout({ $type => 1, fallback => $fallback });
# where $type is transport | client | policy
#
# Centralizes all timeout logic.
# Transport refers to login process, client to active connections.
# Policy timeout is transaction timeout (used in ACS status message).
#
# Fallback is optional. If you do not pass transport, client or policy,
# you will get fallback or hardcoded default.
sub get_timeout {
my ( $server, $params ) = @_;
my $fallback = $params->{fallback} || 30;
my $service = $server->{service} // {};
my $config = $server->{config} // {};
if( $params->{transport} ||
( $params->{client} && !exists $service->{client_timeout} )) {
# We do not allow zero values here.
# Note: config/timeout seems to be deprecated.
return $service->{timeout} || $config->{timeout} || $fallback;
} elsif( $params->{client} ) {
# We know that client_timeout exists now.
# We do allow zero values here to indicate no timeout.
return 0 if $service->{client_timeout} =~ /^0+$|\D/;
return $service->{client_timeout};
} elsif( $params->{policy} ) {
my $policy = $server->{policy} // {};
my $rv = sprintf( "%03d", $policy->{timeout} // 0 );
if( length($rv) != 3 ) {
siplog( "LOG_ERR", "Policy timeout has wrong size: '%s'", $rv );
return '000';
}
return $rv;
} else {
return $fallback;
}
}
1;
__END__
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