1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
############################################################################
#
# Standalone nathelper which can be used with SIP proxy
# for transferring RTP data between networks/through a firewall..
# uses Net::SIP::NAT::NATHelper::Server which communicates
# with Net::SIP::NAT::NATHelper::Client
#
# Communication is via sock_stream sockets (unix domain or tcp) and the
# commands are are an array-ref consisting of the command name
# and the arguments. Commands are 'allocate','activate' and 'close'.
# For the arguments of the command and the return values see the
# methods in Net::SIP::NATHelper::Base.
# For transport the requests and responses will be packet with
# Storable::nfreeze and prefixed with a long in network format containing
# the length of the freezed packet (necessary, because stream sockets
# are used).
#
############################################################################
use strict;
use warnings;
use Getopt::Long qw(:config posix_default bundling);
use File::Path;
use IO::Socket;
use Net::SIP ':debug';
use Net::SIP::NATHelper::Server;
############################################################################
# USAGE
############################################################################
sub usage {
print STDERR "ERROR: @_\n" if @_;
print STDERR <<USAGE;
NAT Helper for SIP proxy.
Reads cmds from cmd-socket, allocates sockets for RTP and send
information about sockets back to caller, which then rewrites the
SDP bodies in the SIP packets.
$0 [options] cmd-socket+
Options:
-d|--debug [level] Enable debugging
-h|--help Help (this info)
-R|--chroot cage-dir run chrooted (after opening sockets)
cmd-socket is a UNIX domain socket if it contains '/'. If it points
to an existing directory or contains a trailing '/' cmd-socket will be
interpreted as a directory name and a file 'socket' will be created below
the directory.
If the syntax is 'host:port' a TCP socket will be created.
Multiple cmd-sockets can be specified.
USAGE
exit( @_ ? 1:0 );
}
############################################################################
# Read Options
############################################################################
my ($debug,$chroot);
GetOptions(
'd|debug:i' => \$debug,
'h|help' => sub { usage() },
'R|chroot=s' => \$chroot,
) || usage( 'bad option' );
Net::SIP::Debug->level( $debug || 1 ) if defined $debug;
my @sockets = @ARGV;
@sockets or usage( "no command sockets" );
my @cfd;
foreach my $socket ( @sockets ) {
DEBUG( $socket );
if ( $socket =~ m{/} ) {
if ( $socket =~m{/$} or -d $socket ) {
-d $socket or mkpath( $socket, 0,0700 )
or die $!;
$socket = $socket."/socket";
}
push @cfd, IO::Socket::UNIX->new( Type => SOCK_STREAM, Local => $socket )
|| die $!;
} elsif ( $socket =~ m{^(.*):(\d+)$} ) {
push @cfd, IO::Socket::INET->new(
LocalAddr => $1,
LocalPort => $2,
Listen => 10,
Reuse => 1,
) || die $!;
}
}
# all sockets allocated, now we can change root if necessary
if ( $chroot ) {
# load Storable::* by eval if chroot
eval { Storable::thaw() };
eval { Storable::nfreeze() };
chdir( $chroot ) || die $!;
chroot( '.' ) || die $!;
}
# create wrapper and run
Net::SIP::NATHelper::Server->new( @cfd )->loop;
|
