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 $len; |
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36 | if (($len) = $msg =~ m/^([[:xdigit:]]{4})/) { |
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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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