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shairport.pl
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shairport.pl
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#!/usr/bin/perl
# Configure the following two options:
# AP name - as will be shown in iTunes' menu
# example:
# my $apname = "SteePort";
my $apname = "HairPort $$ on " . `hostname`;
# password - required to connect
# for no password, set:
# my $password = '';
my $password = '';
# that's all!
# ShairPort - Airtunes compatible server
# Copyright (c) 2011 James Laird
# All rights reserved.
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
use IO::Select;
use IO::Socket;
use MIME::Base64;
use HTTP::Request;
use HTTP::Response;
use IPC::Open2;
use Crypt::OpenSSL::RSA;
use Digest::MD5 qw/md5_hex/;
use POSIX ":sys_wait_h";
chomp $apname;
my @hw_addr = (0, map { int rand 256 } 1..5);
sub POPE {
print "broken pipe\n";
$SIG{PIPE} = \&POPE;
}
$SIG{PIPE} = \&POPE;
my $avahi_publish = fork();
if ($avahi_publish==0) {
exec 'avahi-publish-service',
join('', map { sprintf "%02X", $_ } @hw_addr) . "\@$apname",
"_raop._tcp",
"5000",
"tp=UDP","sm=false","sv=false","ek=1","et=0,1","cn=0,1","ch=2","ss=16","sr=44100","pw=false","vn=3","txtvers=1";
exec 'dns-sd',
'-R', join('', map { sprintf "%02X", $_ } @hw_addr) . "\@$apname",
"_raop._tcp",
"local", "5000",
"tp=UDP","sm=false","sv=false","ek=1","et=0,1","cn=0,1","ch=2","ss=16","sr=44100","pw=false","vn=3","txtvers=1";
die "could not run avahi-publish-service nor dns-sd";
}
sub REAP {
if ($avahi_publish == waitpid(-1, WNOHANG)) {
die("Avahi publishing failed!");
}
printf("***CHILD EXITED***\n");
$SIG{CHLD} = \&REAP;
};
$SIG{CHLD} = \&REAP;
my %conns;
$SIG{TERM} = $SIG{INT} = $SIG{__DIE__} = sub {
print "killed\n";
map { eval { kill $_->{decoder_pid} } } keys %conns;
kill 9, $avahi_publish;
exit(0);
};
my $airport_pem = join '', <DATA>;
my $rsa = Crypt::OpenSSL::RSA->new_private_key($airport_pem) || die "RSA private key import failed";
my $listen = new IO::Socket::INET(Listen => 1,
LocalPort => 5000,
ReuseAddr => 1,
Proto => 'tcp');
die "Can't listen on port 5000: $!" unless $listen;
my $sel = new IO::Select($listen);
print "listening...\n";
while (1) {
my @waiting = $sel->can_read;
foreach $fh (@waiting) {
if ($fh==$listen) {
my $new = $listen->accept;
print "new connection\n";
$sel->add($new);
$new->blocking(0);
$conns{$new} = {fh => $fh};
} else {
if (eof($fh)) {
print "closed: $fh\n";
$sel->remove($fh);
close $fh;
eval { kill $conns{$fh}{decoder_pid} };
delete $conns{$fh};
next;
}
if (exists $conns{$fh}) {
conn_handle_data($fh);
}
}
}
}
sub conn_handle_data {
my $fh = shift;
my $conn = $conns{$fh};
if ($conn->{req_need}) {
if (length($conn->{data}) >= $conn->{req_need}) {
$conn->{req}->content(substr($conn->{data}, 0, $conn->{req_need}, ''));
conn_handle_request($fh, $conn);
}
undef $conn->{req_need};
return;
}
read $fh, my $data, 4096;
$conn->{data} .= $data;
if ($conn->{data} =~ /(\r\n\r\n|\n\n|\r\r)/) {
my $req_data = substr($conn->{data}, 0, $+[0], '');
$conn->{req} = HTTP::Request->parse($req_data);
printf "REQ: %s\n", $conn->{req}->method;
conn_handle_request($fh, $conn);
conn_handle_data($fh) if length($conn->{data});
}
}
sub digest_ok {
my ($req, $conn) = @_;
my $authz = $req->header('Authorization');
return 0 unless $authz =~ s/^Digest\s+//i;
return 0 unless length $conn->{nonce};
my @authz = split /,\s*/, $authz;
my %authz = map { /(.+)="(.+)"/; ($1, $2) } @authz;
# not a standard digest - uses capital hex digits, in conflict with the RFC
my $digest = uc md5_hex (
uc(md5_hex($authz{username} . ':' . $authz{realm} . ':' . $password))
. ':' . $authz{nonce} . ':' .
uc(md5_hex($req->method . ':' . $authz{uri}))
);
return $digest eq $authz{response};
}
sub conn_handle_request {
my ($fh, $conn) = @_;
my $req = $conn->{req};;
my $clen = $req->header('content-length') // 0;
if ($clen > 0 && !length($req->content)) {
$conn->{req_need} = $clen;
return; # need more!
}
my $resp = HTTP::Response->new(200);
$resp->request($req);
$resp->protocol($req->protocol);
$resp->header('CSeq', $req->header('CSeq'));
$resp->header('Audio-Jack-Status', 'connected; type=analog');
if (my $chall = $req->header('Apple-Challenge')) {
my $data = decode_base64($chall);
$data .= join '', map { chr } split(/\./, $fh->sockhost);
$data .= join '', map { chr } @hw_addr;
$data .= chr(0) x (0x20-length($data));
$rsa->use_pkcs1_padding; # this isn't hashed before signing
my $signature = encode_base64 $rsa->private_encrypt($data), '';
$signature =~ s/=*$//;
$resp->header('Apple-Response', $signature);
}
if (length $password) {
if (!digest_ok($req, $conn)) {
my $nonce = md5_hex(map { rand } 1..20);
$conn->{nonce} = $nonce;
$resp->header('WWW-Authenticate', "Digest realm=\"$apname\", nonce=\"$nonce\"");
$resp->code(401);
$req->method('DENIED');
}
}
for ($req->method) {
/^OPTIONS$/ && do {
$resp->header('Public', 'ANNOUNCE, SETUP, RECORD, PAUSE, FLUSH, TEARDOWN, OPTIONS, GET_PARAMETER, SET_PARAMETER');
last;
};
/^ANNOUNCE$/ && do {
my $sdptext = $req->content;
my @sdplines = split /[\r\n]+/, $sdptext;
my %sdp = map { ($1, $2) if /^a=([^:]+):(.+)/ } @sdplines;
die("no AESIV") unless my $aesiv = decode_base64($sdp{aesiv});
die("no AESKEY") unless my $rsaaeskey = decode_base64($sdp{rsaaeskey});
$rsa->use_pkcs1_oaep_padding;
my $aeskey = $rsa->decrypt($rsaaeskey) || die "RSA decrypt failed";
$conn->{aesiv} = $aesiv;
$conn->{aeskey} = $aeskey;
$conn->{fmtp} = $sdp{fmtp};
last;
};
/^SETUP$/ && do {
my $transport = $req->header('Transport');
$transport =~ s/;control_port=(\d+)//;
my $cport = $1;
$transport =~ s/;timing_port=(\d+)//;
my $tport = $1;
$transport =~ s/;server_port=(\d+)//;
my $dport = $1;
$resp->header('Session', 'DEADBEEF');
my $dec = sprintf("./hairtunes iv %s key %s fmtp %s cport %s tport %s dport %s host %s",
map { "'$_'" } (
unpack('H*', $conn->{aesiv}),
unpack('H*', $conn->{aeskey}),
$conn->{fmtp},
$cport, $tport, $dport,
'unused'
));
# print "decode command: $dec\n";
my $decoder = open2(my $dec_out, my $dec_in, $dec);
$conn->{decoder_pid} = $decoder;
$conn->{decoder_fh} = $dec_in;
my $portdesc = <$dec_out>;
die("Expected port number from decoder; got $portdesc") unless $portdesc =~ /^port: (\d+)/;
my $port = $1;
print "launched decoder: $decoder on port: $port\n";
$resp->header('Transport', $req->header('Transport') . ";server_port=$port");
last;
};
/^RECORD$/ && last;
/^FLUSH$/ && do {
my $dfh = $conn->{decoder_fh};
print $dfh "flush\n";
last;
};
/^TEARDOWN$/ && do {
$resp->header('Connection', 'close');
close $conn->{decoder_fh};
last;
};
/^SET_PARAMETER$/ && do {
my @lines = split /[\r\n]+/, $req->content;
my %content = map { /^(\S+): (.+)/; (lc $1, $2) } @lines;
my $cfh = $conn->{decoder_fh};
if (exists $content{volume}) {
printf $cfh "vol: %f\n", $content{volume};
}
last;
};
/^GET_PARAMETER$/ && last;
/^DENIED$/ && last;
die("Unknown method: $_");
}
print $fh $resp->as_string("\r\n");
$fh->flush;
}
__DATA__
-----BEGIN RSA PRIVATE KEY-----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=
-----END RSA PRIVATE KEY-----