3 # A git daemon with an added userv security boundary.
5 # This was written by Tony Finch <dot@dotat.at> and subsequently
6 # heavily modified by Ian Jackson <ijackson@chiark.greenend.org.uk>
7 # http://creativecommons.org/publicdomain/zero/1.0/
18 return ('(local)') unless defined $sockaddr;
19 my ($port,$addr) = sockaddr_in $sockaddr;
20 $addr = inet_ntoa $addr;
21 return ("[$addr]:$port",$addr,$port);
23 our ($client,$client_addr,$client_port) = ntoa getpeername STDIN;
24 our ($server,$server_addr,$server_port) = ntoa getsockname STDIN;
25 our ($service,$specpath,$spechost);
27 openlog 'userv-git-daemon', 'pid', 'daemon';
28 sub fail { syslog 'err', "$client @_"; exit }
30 $SIG{ALRM} = sub { fail "timeout" };
36 while ($length > length $buffer) {
37 my $ret = sysread STDIN, $buffer, $length, length $buffer;
38 fail "Expected $length bytes, got ".length $buffer
39 if defined $ret and $ret == 0;
40 fail "read: $!" if not defined $ret and $! != EINTR and $! != EAGAIN;
44 my $hex_len = xread 4;
45 fail "Bad hex in packet length" unless $hex_len =~ m|^[0-9a-fA-F]{4}$|;
46 my $line = xread -4 + hex $hex_len;
47 unless (($service,$specpath,$spechost) = $line =~
48 m|^(git-[a-z-]+) /*([!-~]+)\0host=([!-~]+)\0$|) {
49 $line =~ s|[^ -~]+| |g;
50 fail "Could not parse \"$line\""
55 fail "No mapping for $uri" unless defined $serve_user;
56 syslog 'notice', "$client $service $serve_user $uri";
58 my ($hn,$ha,$at,$naddrs,@addrs) = gethostbyname $host;
59 die "hostname/address mismatch ($spechost $server_addr)" unless grep {
60 $server_addr eq inet_ntoa $_
63 my @opts = map "-D$_=${$::{$_}}",
65 client client_addr client_port
66 server server_addr server_port);
68 my @cmd = ('userv', '-t300', @opts, $user, $service);
69 no warnings; # suppress errors to stderr
70 exec @cmd or fail "exec userv: $!";