From: Tony Finch <dot@dotat.at>
Date: Wed, 31 Mar 2010 00:39:19 +0000 (+0100)
Subject: git-daemon: fix and de-obfuscate the pkt-line parser.
X-Git-Tag: userv/0.6.1~100
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=userv-utils.git;a=commitdiff_plain;h=5f3e811b5415dcff74f82bdd2f26d3af1f73c555

git-daemon: fix and de-obfuscate the pkt-line parser.
---

diff --git a/git-daemon/git-daemon.pl b/git-daemon/git-daemon.pl
index 91dd727..645cbc5 100755
--- a/git-daemon/git-daemon.pl
+++ b/git-daemon/git-daemon.pl
@@ -31,21 +31,23 @@ $SIG{ALRM} = sub { fail "timeout" };
 alarm 30;
 
 sub xread {
-    my $length = shift; $_ = "";
-    while ($length > length) {
-        my $ret = sysread STDIN, $_, $length, length;
-        fail "Expected $length bytes, got ".length
+    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 $buffer;
 }
-xread 4;
-fail "Bad hex in packet length" unless m|^[0-9a-fA-F]{4}$|;
-xread hex;
-unless (($service,$path,$host) =
+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,$path,$host) = $line =~
         m|^(git-[a-z-]+) /*([!-~]+)\0host=([!-~]+)\0$|) {
-    s|[^ -~]+| |g;
-    fail "Could not parse \"$_\""
+    $line =~ s|[^ -~]+| |g;
+    fail "Could not parse \"$line\""
 }
 our $uri = $_ = "git://$host/$path";
 for my $cf (@ARGV) { do $cf }