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  "   ˆl–Ým_J•7µ ¶ ™¸&n6Ò˜´oÁƒtL¿À¿ G    #!/usr/bin/perl
# Name: /usr/local/bin/rrsync (should also have a symlink in /usr/bin)
# Purpose: Restricts rsync to subdirectory declared in .ssh/authorized_keys
# Author: Joe Smith <js-cgi@inwap.com> 30-Sep-2004
# Modified by: Wayne Davison <wayned@samba.org>
use strict;

use Socket;
use Cwd 'abs_path';
use File::Glob ':glob';

# You may configure these values to your liking.  See also the section
# of options if you want to disable any options that rsync accepts.
use constant RSYNC => '/usr/bin/rsync';
use constant LOGFILE => 'rrsync.log';

my $Usage = <<EOM;
Use 'command="$0 [-ro|-wo] SUBDIR"'
	in front of lines in $ENV{HOME}/.ssh/authorized_keys
EOM

# Handle the -ro and -wo options.
our $only = '';
while (@ARGV && $ARGV[0] =~ /^-([rw])o$/) {
    my $r_or_w = $1;
    if ($only && $only ne $r_or_w) {
	die "$0: the -ro and -wo options conflict.\n";
    }
    $only = $r_or_w;
    shift;
}

our $subdir = shift;
die "$0: No subdirectory specified\n$Usage" unless defined $subdir;
$subdir = abs_path($subdir);
die "$0: Restricted directory does not exist!\n" if $subdir ne '/' && !-d $subdir;

# The client uses "rsync -av -e ssh src/ server:dir/", and sshd on the server
# executes this program when .ssh/authorized_keys has 'command="..."'.
# For example:
# command="rrsync logs/client" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAzGhEeNlPr...
# command="rrsync -ro results" ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAmkHG1WCjC...
#
# Format of the environment variables set by sshd:
# SSH_ORIGINAL_COMMAND=rsync --server          -vlogDtpr --partial . ARG # push
# SSH_ORIGINAL_COMMAND=rsync --server --sender -vlogDtpr --partial . ARGS # pull
# SSH_CONNECTION=client_addr client_port server_port

my $command = $ENV{SSH_ORIGINAL_COMMAND};
die "$0: Not invoked via sshd\n$Usage"	unless defined $command;
die "$0: SSH_ORIGINAL_COMMAND='$command' is not rsync\n" unless $command =~ s/^rsync\s+//;
die "$0: --server option is not first\n" unless $command =~ /^--server\s/;
our $am_sender = $command =~ /^--server\s+--sender\s/; # Restrictive on purpose!
die "$0 sending to read-only server not allowed\n" if $only eq 'r' && !$am_sender;
die "$0 reading from write-only server not allowed\n" if $only eq 'w' && $am_sender;

### START of options data produced by the cull_options script. ###

# These options are the only options that rsync might send to the server,
# and only in the option format that the stock rsync produces.

# To disable a short-named option, add its letter to this string:
our $short_disabled = 's';

our $short_no_arg = 'ACDEHIJKLORSWXbcdgklmnoprstuvxyz'; # DO NOT REMOVE ANY
our $short_with_num = 'B'; # DO NOT REMOVE ANY

# To disable a long-named option, change its value to a -1.  The values mean:
# 0 = the option has no arg; 1 = the arg doesn't need any checking; 2 = only
# check the arg when receiving; and 3 = always check the arg.
our %long_opt = (
  'append' => 0,
  'backup-dir' => 2,
  'block-size' => 1,
  'bwlimit' => 1,
  'checksum-seed' => 1,
  'compare-dest' => 2,
  'compress-level' => 1,
  'copy-dest' => 2,
  'copy-unsafe-links' => 0,
  'daemon' => -1,
  'debug' => 1,
  'delay-updates' => 0,
  'delete' => 0,
  'delete-after' => 0,
  'delete-before' => 0,
  'delete-delay' => 0,
  'delete-during' => 0,
  'delete-excluded' => 0,
  'delete-missing-args' => 0,
  'existing' => 0,
  'fake-super' => 0,
  'files-from' => 3,
  'force' => 0,
  'from0' => 0,
  'fuzzy' => 0,
  'group' => 0,
  'groupmap' => 1,
  'hard-links' => 0,
  'iconv' => 1,
  'ignore-errors' => 0,
  'ignore-existing' => 0,
  'ignore-missing-args' => 0,
  'ignore-times' => 0,
  'info' => 1,
  'inplace' => 0,
  'link-dest' => 2,
  'links' => 0,
  'list-only' => 0,
  'log-file' => 3,
  'log-format' => 1,
  'max-delete' => 1,
  'max-size' => 1,
  'min-size' => 1,
  'modify-window' => 1,
  'new-compress' => 0,
  'no-implied-dirs' => 0,
  'no-r' => 0,
  'no-relative' => 0,
  'no-specials' => 0,
  'numeric-ids' => 0,
  'one-file-system' => 0,
  'only-write-batch' => 1,
  'owner' => 0,
  'partial' => 0,
  'partial-dir' =