WIP entirely new git approach with config parsers

[userv-utils.git] / git-daemon / git-daemon.in

diff --git a/git-daemon/git-daemon.in b/git-daemon/git-daemon.in
new file mode 100755 (executable)
index 0000000..8fe8ca1
--- /dev/null
+++ b/git-daemon/git-daemon.in
@@ -0,0 +1,72 @@
+#!/usr/bin/perl
+#
+# A git daemon with an added userv security boundary.
+#
+# This was written by Tony Finch <dot@dotat.at> and subsequently
+# heavily modified by Ian Jackson <ijackson@chiark.greenend.org.uk>
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+use strict;
+use warnings;
+
+use POSIX;
+use Socket;
+use Sys::Syslog;
+
+sub ntoa {
+    my $sockaddr = shift;
+    return ('(local)') unless defined $sockaddr;
+    my ($port,$addr) = sockaddr_in $sockaddr;
+    $addr = inet_ntoa $addr;
+    return ("[$addr]:$port",$addr,$port);
+}
+our ($client,$client_addr,$client_port) = ntoa getpeername STDIN;
+our ($server,$server_addr,$server_port) = ntoa getsockname STDIN;
+our ($service,$specpath,$spechost);
+
+openlog 'userv-git-daemon', 'pid', 'daemon';
+sub fail { syslog 'err', "$client @_"; exit }
+
+$SIG{ALRM} = sub { fail "timeout" };
+alarm 30;
+
+sub xread {
+    my $length = shift;
+    my $buffer = "";
+    while ($length > length $buffer) {
+        my $ret = sysread STDIN, $buffer, $length, length $buffer;
+        fail "Expected $length bytes, got ".length $buffer
+                            if defined $ret and $ret == 0;
+        fail "read: $!" if not defined $ret and $! != EINTR and $! != EAGAIN;
+    }
+    return $buffer;
+}
+my $hex_len = xread 4;
+fail "Bad hex in packet length" unless $hex_len =~ m|^[0-9a-fA-F]{4}$|;
+my $line = xread -4 + hex $hex_len;
+unless (($service,$specpath,$spechost) = $line =~
+        m|^(git-[a-z-]+) /*([!-~]+)\0host=([!-~]+)\0$|) {
+    $line =~ s|[^ -~]+| |g;
+    fail "Could not parse \"$line\""
+}
+
+@@READ_URLMAP@@
+
+fail "No mapping for $uri" unless defined $serve_user;
+syslog 'notice', "$client $service $serve_user $uri";
+
+my ($hn,$ha,$at,$naddrs,@addrs) = gethostbyname $host;
+die "hostname/address mismatch ($spechost $server_addr)" unless grep {
+    $server_addr eq inet_ntoa $_
+    } @addrs;
+
+my @opts = map "-D$_=${$::{$_}}",
+    qw(service path host
+       client client_addr client_port
+       server server_addr server_port);
+
+my @cmd = ('userv', '-t300', @opts, $user, $service);
+no warnings; # suppress errors to stderr
+exec @cmd or fail "exec userv: $!";
+
+# end