[825] | 1 | #!/usr/bin/perl |
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| 2 | # |
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| 3 | # svnproxy: Wrapper around svnserve for Subversion virtual hosting. |
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| 4 | # version 1.0, released 2008-08-29 |
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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 | # Read the initial greeting from a dummy svnserve process. |
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| 27 | my $pid = open(IN, '-|'); |
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| 28 | defined $pid or die "$0: open: $!"; |
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| 29 | if ($pid == 0) { |
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| 30 | close(STDIN) or die "$0: close: $!"; |
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| 31 | exec('svnserve', '-i') or die "$0: exec svnproxy: $!"; |
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| 32 | } |
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| 33 | my $greeting = ''; |
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| 34 | for (;;) { |
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| 35 | my $n = sysread(IN, my $buf, 4096); |
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| 36 | next if $n < 0 and $! == EINTR; |
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| 37 | $n >= 0 or die "$0: read: $!"; |
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| 38 | last if $n == 0; |
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| 39 | $greeting .= $buf; |
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| 40 | } |
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| 41 | |
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| 42 | # Send the greeting to the client. |
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| 43 | my $buf = $greeting; |
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| 44 | while ($buf ne '') { |
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| 45 | my $n = syswrite(STDOUT, $buf); |
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| 46 | next if $n < 0 and $! == EINTR; |
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| 47 | $n >= 0 or die "$0: write: $!"; |
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| 48 | $buf = substr($buf, $n); |
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| 49 | } |
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| 50 | close(IN) or die "$0: close: $!"; |
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| 51 | waitpid(-1, 0) or die "$0: waitpid: $!"; |
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| 52 | |
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| 53 | # Receive the response from the client, and parse out the URL. |
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| 54 | my $url; |
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| 55 | my $response = ''; |
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| 56 | for (;;) { |
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| 57 | my $n = sysread(STDIN, my $buf, 4096); |
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| 58 | next if $n < 0 and $! == EINTR; |
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| 59 | $n >= 0 or die "$0: read: $!"; |
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| 60 | $n > 0 or die "$0: unexpected response from client"; |
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| 61 | $response .= $buf; |
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| 62 | my $url_len; |
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| 63 | if (($url_len) = $response =~ m/^\(\s\S+\s\(\s[^)]*\)\s(\d+):/ and |
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| 64 | length($') >= $url_len) { |
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| 65 | $url = substr($', 0, $url_len); |
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| 66 | last; |
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| 67 | } elsif ($response !~ m/^(?:\((?:\s(?:\S+(?:\s(?:\((?:\s(?:[^)]*(?:\)(?:\s(?:\d+:?)?)?)?)?)?)?)?)?)?)?$/) { |
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| 68 | die "$0: unexpected response from client"; |
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| 69 | } |
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| 70 | } |
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| 71 | |
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| 72 | # Now start the real svnserve based on the URL. |
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| 73 | open2(\*IN, \*OUT, '/usr/local/sbin/ldapize.pl', $url) or die "$0: open: $!"; |
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| 74 | |
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| 75 | # Read the greeting, expecting it to be identical to the dummy greeting. |
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| 76 | while ($greeting ne '') { |
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| 77 | my $n = sysread(IN, my $buf, length($greeting)); |
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| 78 | next if $n < 0 and $! == EINTR; |
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| 79 | $n >= 0 or die "$0: read: $!"; |
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| 80 | $n > 0 or die "$0: svnserve unexpectedly closed connection"; |
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| 81 | $greeting =~ s/^\Q$buf\E// or die "$0: unexpected greeting from svnserve"; |
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| 82 | } |
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| 83 | |
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| 84 | # Finally, go into a select loop to transfer the remaining data |
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[835] | 85 | # (STDIN -> OUT, IN -> STDOUT), including the client's response to svnserve. |
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| 86 | my ($cbuf, $sbuf) = ($response, ''); |
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[825] | 87 | my ($rin, $win, $ein) = ('', '', ''); |
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| 88 | my ($stdout, $out, $stdin, $in) = (fileno(STDOUT), fileno(OUT), fileno(STDIN), fileno(IN)); |
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| 89 | vec($win, $stdout, 1) = 0; |
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[835] | 90 | vec($win, $out, 1) = 1; |
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| 91 | vec($rin, $stdin, 1) = 0; |
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[825] | 92 | vec($rin, $in, 1) = 1; |
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| 93 | while (vec($win, $stdout, 1) or vec($win, $out, 1) or |
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| 94 | vec($rin, $stdin, 1) or vec($rin, $in, 1)) { |
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| 95 | my $n = select(my $rout = $rin, my $wout = $win, my $eout = $ein, undef); |
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| 96 | next if $n < 0 and $! == EINTR; |
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| 97 | $n >= 0 or die "select: $!"; |
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| 98 | if (vec($rout, $stdin, 1)) { |
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| 99 | my $n = sysread(STDIN, $cbuf, 4096); |
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| 100 | next if $n < 0 and $! == EINTR; |
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| 101 | $n >= 0 or die "read: $!"; |
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| 102 | vec($rin, $stdin, 1) = 0; |
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| 103 | vec($win, $out, 1) = 1; |
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| 104 | } elsif (vec($rout, $in, 1)) { |
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| 105 | my $n = sysread(IN, $sbuf, 4096); |
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| 106 | next if $n < 0 and $! == EINTR; |
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| 107 | $n >= 0 or die "read: $!"; |
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| 108 | vec($rin, $in, 1) = 0; |
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| 109 | vec($win, $stdout, 1) = 1; |
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| 110 | } elsif (vec($wout, $stdout, 1) && $sbuf ne '') { |
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| 111 | my $n = syswrite(STDOUT, $sbuf); |
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| 112 | next if $n < 0 and $! == EINTR; |
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| 113 | $n >= 0 or die "write: $!"; |
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| 114 | $sbuf = substr($sbuf, $n); |
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| 115 | if ($sbuf eq '') { |
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| 116 | vec($win, $stdout, 1) = 0; |
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| 117 | vec($rin, $in, 1) = 1; |
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| 118 | } |
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| 119 | } elsif (vec($wout, $stdout, 1)) { |
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| 120 | vec($win, $stdout, 1) = 0; |
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| 121 | close(STDOUT) or die "close: $!"; |
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| 122 | close(IN) or die "close: $!"; |
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| 123 | } elsif (vec($wout, $out, 1) && $cbuf ne '') { |
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| 124 | my $n = syswrite(OUT, $cbuf); |
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| 125 | next if $n < 0 and $! == EINTR; |
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| 126 | $n >= 0 or die "write: $!"; |
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| 127 | $cbuf = substr($cbuf, $n); |
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| 128 | if ($cbuf eq '') { |
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| 129 | vec($win, $out, 1) = 0; |
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| 130 | vec($rin, $stdin, 1) = 1; |
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| 131 | } |
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| 132 | } elsif (vec($wout, $out, 1)) { |
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| 133 | vec($win, $out, 1) = 0; |
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| 134 | close(OUT) or die "close: $!"; |
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| 135 | close(STDIN) or die "close: $!"; |
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| 136 | } |
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| 137 | } |
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