[849] | 1 | #!/usr/bin/perl |
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| 2 | # |
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| 3 | # gitproxy: Wrapper around git daemon for Git virtual hosting. |
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| 4 | # version 1.0, released 2008-10-08 |
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| 5 | # Copyright © 2008 Anders Kaseorg <andersk@mit.edu> |
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| 6 | # |
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| 7 | # This program is free software; you can redistribute it and/or |
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| 8 | # modify it under the terms of the GNU General Public License |
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| 9 | # as published by the Free Software Foundation; either version 2 |
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| 10 | # of the License, or (at your option) any later version. |
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| 11 | # |
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| 12 | # This program is distributed in the hope that it will be useful, |
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| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | # GNU General Public License for more details. |
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| 16 | # |
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| 17 | # You should have received a copy of the GNU General Public License |
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| 18 | # along with this program; if not, write to the Free Software |
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| 19 | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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| 20 | |
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| 21 | use strict; |
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| 22 | use warnings; |
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| 23 | use IPC::Open2; |
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| 24 | use Errno qw(EINTR); |
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| 25 | |
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| 26 | # Receive the first message from the client, and parse out the URL. |
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| 27 | my $host; |
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| 28 | my $msg = ''; |
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| 29 | for (;;) { |
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| 30 | my $n = sysread(STDIN, my $buf, 4096); |
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| 31 | next if $n < 0 and $! == EINTR; |
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| 32 | $n >= 0 or die "$0: read: $!"; |
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| 33 | $n > 0 or die "$0: unexpected message from client"; |
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| 34 | $msg .= $buf; |
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| 35 | my $len; |
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[851] | 36 | if (($len) = $msg =~ m/^([[:xdigit:]]{4})/ and length($msg) >= hex($len)) { |
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[849] | 37 | foreach (split("\0", $')) { |
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| 38 | last if ($host) = m/^host=(.*)$/; |
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| 39 | } |
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| 40 | last if defined($host); |
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| 41 | die "$0: no host found in client message"; |
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| 42 | } elsif ($msg !~ m/^[[:xdigit:]]{0,3}$/) { |
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| 43 | die "$0: unexpected message from client"; |
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| 44 | } |
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| 45 | } |
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| 46 | |
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| 47 | # Now start the real git daemon based on the URL. |
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| 48 | open2(\*IN, \*OUT, '/usr/local/sbin/ldapize.pl', "git://$host/") or die "$0: open: $!"; |
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| 49 | |
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| 50 | # Finally, go into a select loop to transfer the remaining data |
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| 51 | # (STDIN -> OUT, IN -> STDOUT), including the client's message to git daemon. |
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| 52 | my ($cbuf, $sbuf) = ($msg, ''); |
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| 53 | my ($rin, $win, $ein) = ('', '', ''); |
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| 54 | my ($stdout, $out, $stdin, $in) = (fileno(STDOUT), fileno(OUT), fileno(STDIN), fileno(IN)); |
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| 55 | vec($win, $stdout, 1) = 0; |
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| 56 | vec($win, $out, 1) = 1; |
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| 57 | vec($rin, $stdin, 1) = 0; |
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| 58 | vec($rin, $in, 1) = 1; |
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| 59 | while (vec($win, $stdout, 1) or vec($win, $out, 1) or |
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| 60 | vec($rin, $stdin, 1) or vec($rin, $in, 1)) { |
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| 61 | my $n = select(my $rout = $rin, my $wout = $win, my $eout = $ein, undef); |
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| 62 | next if $n < 0 and $! == EINTR; |
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| 63 | $n >= 0 or die "select: $!"; |
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| 64 | if (vec($rout, $stdin, 1)) { |
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| 65 | my $n = sysread(STDIN, $cbuf, 4096); |
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| 66 | next if $n < 0 and $! == EINTR; |
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| 67 | $n >= 0 or die "read: $!"; |
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| 68 | vec($rin, $stdin, 1) = 0; |
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| 69 | vec($win, $out, 1) = 1; |
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| 70 | } elsif (vec($rout, $in, 1)) { |
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| 71 | my $n = sysread(IN, $sbuf, 4096); |
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| 72 | next if $n < 0 and $! == EINTR; |
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| 73 | $n >= 0 or die "read: $!"; |
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| 74 | vec($rin, $in, 1) = 0; |
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| 75 | vec($win, $stdout, 1) = 1; |
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| 76 | } elsif (vec($wout, $stdout, 1) && $sbuf ne '') { |
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| 77 | my $n = syswrite(STDOUT, $sbuf); |
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| 78 | next if $n < 0 and $! == EINTR; |
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| 79 | $n >= 0 or die "write: $!"; |
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| 80 | $sbuf = substr($sbuf, $n); |
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| 81 | if ($sbuf eq '') { |
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| 82 | vec($win, $stdout, 1) = 0; |
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| 83 | vec($rin, $in, 1) = 1; |
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| 84 | } |
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| 85 | } elsif (vec($wout, $stdout, 1)) { |
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| 86 | vec($win, $stdout, 1) = 0; |
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| 87 | close(STDOUT) or die "close: $!"; |
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| 88 | close(IN) or die "close: $!"; |
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| 89 | } elsif (vec($wout, $out, 1) && $cbuf ne '') { |
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| 90 | my $n = syswrite(OUT, $cbuf); |
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| 91 | next if $n < 0 and $! == EINTR; |
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| 92 | $n >= 0 or die "write: $!"; |
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| 93 | $cbuf = substr($cbuf, $n); |
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| 94 | if ($cbuf eq '') { |
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| 95 | vec($win, $out, 1) = 0; |
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| 96 | vec($rin, $stdin, 1) = 1; |
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| 97 | } |
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| 98 | } elsif (vec($wout, $out, 1)) { |
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| 99 | vec($win, $out, 1) = 0; |
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| 100 | close(OUT) or die "close: $!"; |
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| 101 | close(STDIN) or die "close: $!"; |
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| 102 | } |
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| 103 | } |
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