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# ex:ts=8 sw=4:
# $OpenBSD: SCP.pm,v 1.23 2010/06/30 10:51:04 espie Exp $
#
# Copyright (c) 2003-2006 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
use strict;
use warnings;
package OpenBSD::PackageRepository::SCP;
our @ISA=qw(OpenBSD::PackageRepository::Distant);
use IPC::Open2;
use IO::Handle;
use OpenBSD::Paths;
sub urlscheme
{
return 'scp';
}
our %distant = ();
# Any SCP repository uses one single connection, reliant on a perl at end.
# The connection starts by xfering and firing up the `distant' script.
sub initiate
{
my $self = shift;
my ($rdfh, $wrfh);
$self->{controller} = open2($rdfh, $wrfh, OpenBSD::Paths->ssh,
$self->{host}, 'perl', '-x');
$self->{cmdfh} = $wrfh;
$self->{getfh} = $rdfh;
$wrfh->autoflush(1);
my $_;
while(<DATA>) {
# compress script a bit
next if m/^\#/o && !m/^\#!/o;
s/^\s*//o;
next if m/^$/o;
print $wrfh $_;
}
seek(DATA, 0, 0);
}
sub may_exist
{
my ($self, $name) = @_;
my $l = $self->list;
return grep {$_ eq $name } @$l;
}
sub grab_object
{
my ($self, $object) = @_;
my $cmdfh = $self->{cmdfh};
my $getfh = $self->{getfh};
print $cmdfh "ABORT\n";
my $_;
while (<$getfh>) {
last if m/^ABORTED/o;
}
print $cmdfh "GET ", $self->{path}.$object->{name}.".tgz", "\n";
close($cmdfh);
$_ = <$getfh>;
chomp;
if (m/^ERROR:/o) {
die "transfer error: $_";
}
if (m/^TRANSFER:\s+(\d+)/o) {
my $buffsize = 10 * 1024;
my $buffer;
my $size = $1;
my $remaining = $size;
my $n;
do {
$n = read($getfh, $buffer,
$remaining < $buffsize ? $remaining :$buffsize);
if (!defined $n) {
die "Error reading\n";
}
$remaining -= $n;
if ($n > 0) {
syswrite STDOUT, $buffer;
}
} while ($n != 0 && $remaining != 0);
exit(0);
}
}
sub maxcount
{
return 1;
}
sub opened
{
my $self = $_[0];
my $k = $self->{host};
if (!defined $distant{$k}) {
$distant{$k} = [];
}
return $distant{$k};
}
sub list
{
my ($self) = @_;
if (!defined $self->{list}) {
if (!defined $self->{controller}) {
$self->initiate;
}
my $cmdfh = $self->{cmdfh};
my $getfh = $self->{getfh};
my $path = $self->{path};
my $l = [];
print $cmdfh "LIST $path\n";
my $_;
$_ = <$getfh>;
if (!defined $_) {
die "Could not initiate SSH session\n";
}
chomp;
if (m/^ERROR:/o) {
die $_;
}
if (!m/^SUCCESS:/o) {
die "Synchronization error\n";
}
while (<$getfh>) {
chomp;
last if $_ eq '';
push(@$l, $_);
}
$self->{list} = $l;
}
return $self->{list};
}
sub cleanup
{
my $self = shift;
if (defined $self->{controller}) {
my $cmdfh = $self->{cmdfh};
my $getfh = $self->{getfh};
print $cmdfh "ABORT\nBYE\nBYE\n";
CORE::close($cmdfh);
CORE::close($getfh);
waitpid($self->{controller}, 0);
}
}
1;
__DATA__
# Distant connection script.
#! /usr/bin/perl
my $pid;
my $token = 0;
$|= 1;
sub batch(&)
{
my $code = shift;
if (defined $pid) {
waitpid($pid, 0);
undef $pid;
}
$token++;
$pid = fork();
if (!defined $pid) {
print "ERROR: fork failed: $!\n";
}
if ($pid == 0) {
&$code();
exit(0);
}
}
sub abort_batch()
{
if (defined $pid) {
kill 1, $pid;
waitpid($pid, 0);
undef $pid;
}
print "\nABORTED $token\n";
}
local $_;
while (<STDIN>) {
chomp;
if (m/^LIST\s+(.*)$/o) {
my $dname = $1;
batch(sub {
my $d;
if (opendir($d, $dname)) {
print "SUCCESS: directory $dname\n";
} else {
print "ERROR: bad directory $dname $!\n";
}
while (my $e = readdir($d)) {
next if $e eq '.' or $e eq '..';
next unless $e =~ m/(.+)\.tgz$/;
next unless -f "$dname/$e";
print "$1\n";
}
print "\n";
closedir($d);
});
} elsif (m/^GET\s+(.*)$/o) {
my $fname = $1;
batch(sub {
if (open(my $fh, '<', $fname)) {
my $size = (stat $fh)[7];
print "TRANSFER: $size\n";
my $buffer = '';
while (read($fh, $buffer, 1024 * 1024) > 0) {
print $buffer;
}
close($fh);
} else {
print "ERROR: bad file $fname $!\n";
}
});
} elsif (m/^BYE$/o) {
exit(0);
} elsif (m/^ABORT$/o) {
abort_batch();
} else {
print "ERROR: Unknown command\n";
}
}
__END__
|
