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 "$0: unexpected greeting from svnserve"; |
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82 | } |
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83 | |
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84 | # Finally, go into a select loop to transfer the remaining data |
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85 | # (STDIN -> OUT, IN -> STDOUT), including the client's response to svnserve. |
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86 | my ($cbuf, $sbuf) = ($response, ''); |
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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, $stdout, 1) = 0; |
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90 | vec($win, $out, 1) = 1; |
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91 | vec($rin, $stdin, 1) = 0; |
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92 | vec($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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