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/
17 if ($ARGV[0] =~ s/^-L//) {
18 my $logfile= shift @ARGV;
19 open STDERR, ">> $logfile" or die $!;
25 return ('(local)') unless defined $sockaddr;
26 my ($port,$addr) = sockaddr_in $sockaddr;
27 $addr = inet_ntoa $addr;
28 return ("[$addr]:$port",$addr,$port);
30 our ($client,$client_addr,$client_port) = ntoa getpeername STDIN;
31 our ($server,$server_addr,$server_port) = ntoa getsockname STDIN;
32 our ($service,$specpath,$spechost);
34 printf STDERR "%s [$$] %s %s\n",
35 strftime("%Y-%m-%d %H:%M:%S %Z", localtime), $server, $client;
37 openlog 'userv-git-daemon', 'pid', 'daemon';
38 sub fail { syslog 'err', "$client @_"; exit }
40 $SIG{ALRM} = sub { fail "timeout" };
46 while ($length > length $buffer) {
47 my $ret = sysread STDIN, $buffer, $length, length $buffer;
48 fail "Expected $length bytes, got ".length $buffer
49 if defined $ret and $ret == 0;
50 fail "read: $!" if not defined $ret and $! != EINTR and $! != EAGAIN;
54 my $hex_len = xread 4;
55 fail "Bad hex in packet length" unless $hex_len =~ m|^[0-9a-fA-F]{4}$|;
56 my $line = xread -4 + hex $hex_len;
57 unless (($service,$specpath,$spechost) = $line =~
58 m|^(git-[a-z-]+) /*([!-~]+)\0host=([!-~]+)\0$|) {
59 $line =~ s|[^ -~]+| |g;
60 fail "Could not parse \"$line\""
65 fail "No global mapping for $uri" unless defined $serve_user;
67 my ($hn,$ha,$at,$naddrs,@addrs) = gethostbyname $spechost;
68 fail "hostname/address mismatch ($spechost $server_addr)" unless grep {
69 $server_addr eq inet_ntoa $_
74 push @opts, "-D$_=${$::{$_}}"
75 for qw(service specpath spechost
76 client client_addr client_port
77 server server_addr server_port);
79 fail "no user $serve_user" unless getpwnam($serve_user);
81 syslog 'notice', "$client $service $uri $serve_user";
83 my @cmd = ('userv', '-t300', @opts, $serve_user, $service);
84 no warnings; # suppress errors to stderr
85 exec @cmd or fail "exec userv: $!";