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#!/usr/bin/perl |
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use Coro; |
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use Coro::Handle; |
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use Coro::Event; |
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use Coro::Semaphore; |
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use Coro::Channel; |
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use Coro::Signal; |
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use Coro::RWLock; |
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use Fcntl; |
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use MD5; |
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use constant PROTVERSION => 1; |
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$VERSION = 0.1; |
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$TIMEOUT = 20; |
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$IDLE = $TIMEOUT < 30 ? $TIMEOUT / 2 : $TIMEOUT - 15; |
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$MAXTIMEDIFF = 10; |
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# WARNING: |
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# Content-Length headers are deliberately being ignored. They |
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# are broken by design and will never be supported |
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# TODO: real message-id parsing |
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$|=1; |
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$v = 9; |
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$SLAVE = 1*($ARGV[0] eq "--slave"); |
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$MYNAME = $SLAVE ? "slave" : "master"; |
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$PREFIX = $SLAVE ? "./dst" : "./src"; |
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@OTHERNAMES = qw(third); |
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my $ecnt; |
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sub slog { |
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if ($_[0] <= $v) { |
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print STDERR "[$SLAVE] ", $_[1]; |
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} |
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} |
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my $lockdisk = new Coro::Semaphore; |
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# give up a/the timeslice |
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sub give { |
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Coro::Event::do_timer(after => 0); |
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} |
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package folder; |
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BEGIN { *slog = \&::slog }; |
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use constant MDIFVERSION => 1; |
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sub new { |
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my $class = shift; |
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my %arg = @_; |
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bless { |
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path => "$::PREFIX/$arg{name}", |
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%arg, |
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}, $class; |
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} |
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sub dirty { |
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$_[0]{dirty} = 1; |
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} |
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sub DESTROY { |
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$_[0]->write_mdif; |
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} |
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# parse_mbox(mbox-file-path, callback) |
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# callback gets called with \$header and \$body, |
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# $header includes the mbox From_ line without |
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# the leading From_ itself. |
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sub parse_mbox { |
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my ($path, $cb) = @_; |
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open my $fh, "<", $path |
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or die "$path: $!"; |
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local $/ = "\n\n"; |
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my ($head, $body, $offs); |
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5 == read $fh, $head, 5 |
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or return; |
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$head eq "From " |
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or return; |
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$offs = 0; |
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while (defined ($head = <$fh>)) { |
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$head =~ /^.*? [A-Z][a-z][a-z] [A-Z][a-z][a-z] [ 0-9][0-9] \d\d:\d\d:\d\d(?: [+-]\d\d\d\d)? \d\d(?:\d\d)\n/ |
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or die "$path: not standard mbox format header:\n$head\n"; |
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local $/ = "\nFrom "; |
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# NEVER enable this. content-length simply is broken by design |
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#if ($head =~ /^Content-Length:\s+(\d+)$/im) { |
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# $1 <= read $fh, $body, $1 + 5 |
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# or die "$path: partial message in mbox"; |
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#} else { |
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$body = <$fh>; |
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#} |
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chomp $body; |
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$cb->($offs, \$head, \$body); |
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$offs = (tell $fh) - 5; |
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::give unless ++$ecnt & 1023; |
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} |
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1; |
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} |
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sub conf_path { |
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(my $conf = $_[0]{path}) =~ s%([^/]+$)%.$1.mdif%; |
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$conf; |
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} |
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sub read_mdif { |
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my $self = shift; |
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my $path = $self->conf_path; |
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return if $self->{idx}; |
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open my $fh, "<", $path |
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or return; |
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defined ($_ = <$fh>) |
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or die "$path: empty mdif file\n"; |
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do { |
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if ($_ eq "[SYNCMAIL]\n") { |
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while (<$fh>) { |
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last unless /^([a-z]+)\s*=\s*(.*)\n$/; |
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$self->{$1} = $2; |
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} |
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} elsif ($_ eq "[HOSTS]\n") { |
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while (<$fh>) { |
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last unless /^([^[].*)=(.*)\n$/; |
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$self->{host}{$1} = $2; |
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} |
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} elsif (/^\[DIFF (\d+)\]\n$/) { |
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my $mtime = $1; |
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my @dif; |
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while (<$fh>) { |
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last unless /^[+-]/; |
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push @dif, substr $_, 0, -1; |
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} |
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unshift @{$self->{diff}}, [$mtime, \@dif]; |
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} elsif ($_ eq "[INDEX]\n") { |
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my @idx; |
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while (<$fh>) { |
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last unless /^(\d+)=(.*)\n$/; |
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push @idx, [$1, $2]; |
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} |
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$self->{idx} = \@idx; |
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} elsif (/^#/) { |
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$_ = <$fh>; |
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# nop |
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} else { |
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die "$path: unparseable section '$_'\n"; |
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} |
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} while defined $_; |
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$self->{version} <= MDIFVERSION |
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or die "$path: version mismatch ($self->{version} found, <".MDIFVERSION." expected)\n"; |
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} |
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sub write_mdif { |
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my $self = shift; |
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my $path = $self->conf_path; |
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return unless $self->{dirty}; |
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open my $fh, ">", "$path~" |
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or die "$path~: $!"; |
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print $fh "# automatically generated, do NOT edit\n"; |
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print $fh "[SYNCMAIL]\n"; |
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print $fh "$_=$self->{$_}\n" for (qw(fsize mtime version)); |
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print $fh "[HOSTS]\n"; |
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while (my ($k,$v) = each %{$self->{host}}) { |
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print $fh "$k=$v\n"; |
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} |
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print $fh "[INDEX]\n"; |
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print $fh "$_->[0]=$_->[1]\n" for @{$self->{idx}}; |
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for (reverse @{$self->{diff}}) { |
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print $fh "[DIFF $_->[0]]\n"; |
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print $fh $_, "\n" for @{$_->[1]}; |
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} |
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close $fh |
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or die "$path~: unable to create updated .mdif: $!"; |
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rename "$path~", $path; |
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delete $self->{dirty}; |
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} |
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sub gendiff { |
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my ($d1, $d2) = @_; |
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my @d; |
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my (%d1, %d2); |
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for (@$d2) { |
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undef $d2{$_->[1]}; |
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} |
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# delete msgs in d1 but not in d2 |
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for (@$d1) { |
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undef $d1{$_->[1]}; |
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push @d, "-$_->[1]" unless exists $d2{$_->[1]}; |
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} |
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%d2 = (); # conserve memory |
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# add msgs in d2 but not in d1 |
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for (@$d2) { |
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push @d, "+$_->[1]" unless exists $d1{$_->[1]}; |
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} |
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\@d; |
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} |
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sub check { |
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my $self = shift; |
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my $path = $self->{path}; |
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my $conf = $self->conf_path; |
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my $guard = $lockdisk->guard; |
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|
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slog 3, "checking $path\n"; |
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if (stat $path) { |
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my ($fsize, $mtime) = (stat _)[7, 9]; |
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if (open my $fh, "<", $conf) { |
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my %conf; |
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<$fh>; # skip initial comment |
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<$fh> eq "[SYNCMAIL]\n" |
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or die "$conf: format error"; |
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while (<$fh> =~ /^([a-z]+)\s*=\s*(.*)$/) { |
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$conf{$1} = $2; |
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} |
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return 1 if $fsize == $conf{fsize} |
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&& $mtime == $conf{mtime}; |
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$conf{mtime} <= $mtime |
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or die "$path: folder older than mdif"; |
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} |
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slog 2, "updating $path\n"; |
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my @idx; |
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parse_mbox $path, sub { |
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my ($offs, $head, $body) = @_; |
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my $mid; |
267 |
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if ($$head =~ /^Message-Id:\s*(<[^<\n]+>)\s*\n/im) { |
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$mid = $1; |
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} else { |
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$mid = MD5->hexhash("$$head\0$$body"); |
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} |
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push @idx, [$offs, $mid]; |
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} or return (); |
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$self->read_mdif; |
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|
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if ($self->{version}) { |
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my $d = gendiff $self->{idx}, \@idx; |
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push @{$self->{diff}}, [ |
280 |
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$self->{mtime}, |
281 |
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1.1 |
$d, |
282 |
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] if @$d; |
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} else { |
284 |
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slog 2, "$path: previously unknown folder\n"; |
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$self->{version} ||= MDIFVERSION; |
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} |
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$self->{fsize} = $fsize; |
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$self->{mtime} = $mtime; |
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$self->{idx} = \@idx; |
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$self->dirty; |
293 |
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|
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return 2; |
295 |
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} else { |
296 |
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slog 2, "$path: no longer exists\n"; |
297 |
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unlink $conf; |
298 |
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return (); |
300 |
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} |
301 |
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} |
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package main; |
304 |
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305 |
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my $quit = new Coro::RWLock; |
306 |
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307 |
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sub rwlock::DESTROY { |
308 |
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$quit->unlock; |
309 |
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} |
310 |
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311 |
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sub quit_guard { |
312 |
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$quit->rdlock; |
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bless [], rwlock; |
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} |
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316 |
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sub find_folders { |
317 |
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my @folders; |
318 |
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319 |
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opendir my $dh, $PREFIX |
320 |
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or die "$PREFIX: $!"; |
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322 |
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while (defined (my $folder = readdir $dh)) { |
323 |
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next if $folder =~ /^\./; |
324 |
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next unless -f "$PREFIX/$folder"; |
325 |
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push @folders, $folder; |
326 |
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} |
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@folders; |
329 |
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} |
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1.1 |
my $send = new Coro::Channel 10; |
332 |
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my $done = 0; |
333 |
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334 |
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# request $command, $data |
335 |
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sub request { |
336 |
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my $res; |
337 |
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my $signal = new Coro::Signal; |
338 |
root |
1.2 |
my $cmd = defined $_[1] ? "000+".length($_[1])." $_[0]\n$_[1]" |
339 |
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: "000 $_[0]\n"; |
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$send->put([$signal, \$res, $cmd]); |
341 |
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$signal->wait; |
342 |
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$res; |
343 |
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} |
344 |
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345 |
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# reply $id, $code, $msg, $data |
346 |
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sub reply { |
347 |
root |
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my $cmd = defined $_[3] ? "$_[1]+".length($_[3])." $_[2]\n$_[3]" |
348 |
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: "$_[1] $_[2]\n"; |
349 |
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$send->put([undef, undef, "$_[0] $cmd"]); |
350 |
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} |
351 |
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352 |
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sub handle_commands { |
353 |
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my ($fh) = @_; |
354 |
root |
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# periodically send nop as keepalive signal to avoid the |
356 |
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# rsync-on-slow-disk-timeout problem. |
357 |
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my $nopper = Event->timer(parked => 1, cb => sub { request "nop" }); |
358 |
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359 |
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my @folder; |
360 |
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361 |
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async { |
362 |
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my $id = "a"; |
363 |
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$fh->print("\@SYNCMAIL VERSION $VERSION PROTOCOL ".PROTVERSION."\n"); |
364 |
root |
1.1 |
while (my $r = $send->get) { |
365 |
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if (defined $r->[1]) { |
366 |
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my $id = ++$id; |
367 |
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$request{$id} = $r; |
368 |
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print STDERR "<<< $SLAVE sending request $id:$r->[2]";#d# |
369 |
root |
1.1 |
$fh->print("$id $r->[2]"); |
370 |
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} else { |
371 |
root |
1.2 |
print STDERR "<<< $SLAVE sending reply $r->[2]";#d# |
372 |
root |
1.1 |
$fh->print($r->[2]); |
373 |
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} |
374 |
root |
1.2 |
$nopper->at(time+$::IDLE); $nopper->start; |
375 |
root |
1.1 |
} |
376 |
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1.2 |
$fh->print("- 000 quit\n"); |
377 |
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1.1 |
}; |
378 |
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1.2 |
|
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async { |
380 |
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eval { |
381 |
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$fh->timeout($::TIMEOUT); |
382 |
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383 |
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$_ = <$fh>; |
384 |
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$_ eq "\@SYNCMAIL VERSION $VERSION PROTOCOL ".PROTVERSION."\n" |
385 |
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or die "garbled input or version mismatch: $_"; |
386 |
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387 |
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while (<$fh>) { |
388 |
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slog 0, ">>> $SLAVE received :$_"; |
389 |
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/^(\S+) (\d\d\d)(?:\+(\d+))?\s*(.*)$/ |
390 |
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or die "protocol error, garbled command ($_)"; |
391 |
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392 |
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my ($id, $code, $dlen, $msg) = ($1, $2, $3, $4); |
393 |
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my $data; |
394 |
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395 |
|
|
$fh->sysread($data, $dlen) == $dlen |
396 |
|
|
or die "unexpected read error: $!"; |
397 |
|
|
|
398 |
|
|
if ($code == 0) { |
399 |
|
|
if ($msg eq "quit") { |
400 |
|
|
$send->put(undef); |
401 |
|
|
last; |
402 |
|
|
} elsif ($msg eq "nop") { |
403 |
|
|
reply $id, 200, "nop"; |
404 |
|
|
} elsif ($msg eq "myname") { |
405 |
|
|
$OTHERNAME = $data; |
406 |
|
|
slog 3, "otherid set to $OTHERNAME\n"; |
407 |
|
|
reply $id, 200, "myname", $MYNAME; |
408 |
|
|
} elsif ($msg eq "timestamp") { |
409 |
|
|
reply $id, 200, time; |
410 |
|
|
} elsif ($msg eq "folders") { |
411 |
|
|
reply $id, 200, "ok", join "\0", find_folders; |
412 |
|
|
} elsif ($msg eq "open") { |
413 |
|
|
async { |
414 |
|
|
my $folder = new folder name => $data; |
415 |
|
|
$folder->check; |
416 |
|
|
$folder->read_mdif; |
417 |
|
|
push @folder, $folder; |
418 |
|
|
reply $id, 200, "$#folder $folder->{mtime}"; |
419 |
|
|
}; |
420 |
|
|
} elsif ($msg =~ /^update (\d+) (\d+)$/) { |
421 |
|
|
if ($folder[$1]->{host}{$OTHERNAME} != $2) { |
422 |
|
|
$folder[$1]->{host}{$OTHERNAME} = $2; |
423 |
|
|
$folder[$1]->dirty; |
424 |
|
|
} |
425 |
|
|
reply $id, 200, "ok"; |
426 |
|
|
} elsif ($msg =~ /^close (\d+)$/) { |
427 |
|
|
undef $folder[$1]; |
428 |
|
|
reply $id, 200, "ok"; |
429 |
|
|
} else { |
430 |
|
|
chomp; |
431 |
|
|
die "protocol error, unknown command ($_)\n"; |
432 |
|
|
} |
433 |
|
|
} else { |
434 |
|
|
my $r = delete $request{$id} |
435 |
|
|
or die "protocol error, invalid reply id ($_)\n"; |
436 |
|
|
|
437 |
|
|
${$r->[1]} = [$code, $msg, $data]; |
438 |
|
|
$r->[0]->send; |
439 |
|
|
} |
440 |
root |
1.1 |
} |
441 |
root |
1.2 |
}; |
442 |
|
|
|
443 |
|
|
slog 0, "ERROR: $@" if $@; |
444 |
|
|
print STDERR "unlooping\n";#d# |
445 |
|
|
unloop; |
446 |
|
|
}; |
447 |
|
|
|
448 |
|
|
loop; |
449 |
|
|
print STDERR "$SLAVE hiho\n";#d# |
450 |
|
|
} |
451 |
|
|
|
452 |
|
|
my $sync_folder = new Coro::Semaphore 3; # max 3 folders in parallel |
453 |
|
|
|
454 |
|
|
sub sync_folder { |
455 |
|
|
my $name = $_[0]; |
456 |
|
|
|
457 |
|
|
my $quit_guard = quit_guard; |
458 |
|
|
async { |
459 |
|
|
my $guard = $sync_folder->guard; |
460 |
|
|
|
461 |
|
|
::give; |
462 |
|
|
|
463 |
|
|
my $folder = new folder name => $name; |
464 |
|
|
my ($rfid, $rmtime) = split /\s+/, (request open => $name)->[1]; |
465 |
|
|
|
466 |
|
|
$folder->check; |
467 |
|
|
$folder->read_mdif; |
468 |
|
|
my $mtime = $folder->{host}{$OTHERNAME}; |
469 |
root |
1.1 |
|
470 |
root |
1.2 |
$folder->{host}{$OTHERNAME} = $folder->{mtime}; |
471 |
root |
1.1 |
|
472 |
root |
1.2 |
request "update $rfid $folder->{mtime}"; |
473 |
|
|
request "close $rfid"; |
474 |
|
|
undef $quit_guard; |
475 |
root |
1.1 |
} |
476 |
|
|
} |
477 |
|
|
|
478 |
root |
1.2 |
sub main { |
479 |
|
|
# time checking done symmetrically |
480 |
|
|
{ |
481 |
|
|
my $time = time; |
482 |
|
|
my $othertime = (request "timestamp")->[1]; |
483 |
|
|
abs (($time + time)*0.5 - $othertime) <= $::MAXTIMEDIFF |
484 |
|
|
or die "ERROR: time difference between hosts larger than $::MAXTIMEDIFF"; |
485 |
|
|
} |
486 |
root |
1.1 |
|
487 |
root |
1.2 |
$OTHERNAME = (request "myname", $MYNAME)->[2]; |
488 |
|
|
if ($SLAVE) { |
489 |
|
|
# |
490 |
|
|
} else { |
491 |
|
|
for (split /\0/, (request "folders")->[2]) { |
492 |
|
|
if (!-e "$PREFIX/$_") { |
493 |
|
|
slog 2, "created new empty folder $_\n"; |
494 |
|
|
sysopen my $fh, "$PREFIX/$_", O_RDWR|O_CREAT, 0666; |
495 |
|
|
} |
496 |
|
|
} |
497 |
root |
1.1 |
|
498 |
root |
1.2 |
for my $folder (find_folders) { |
499 |
|
|
sync_folder $folder; |
500 |
root |
1.1 |
} |
501 |
root |
1.2 |
|
502 |
|
|
print "writelock\n";#d# |
503 |
|
|
$quit->wrlock; |
504 |
|
|
$send->put(undef); |
505 |
root |
1.1 |
} |
506 |
|
|
} |
507 |
|
|
|
508 |
|
|
if ($SLAVE) { |
509 |
|
|
$HOSTID = "slave"; |
510 |
root |
1.2 |
async \&main; |
511 |
root |
1.1 |
handle_commands unblock \*STDIN; |
512 |
|
|
} else { |
513 |
|
|
$HOSTID = "master"; |
514 |
|
|
{ |
515 |
|
|
use Socket; |
516 |
|
|
socketpair S1, S2, AF_UNIX, SOCK_STREAM, PF_UNSPEC; |
517 |
|
|
if (fork == 0) { |
518 |
root |
1.2 |
close S1; |
519 |
root |
1.1 |
open STDIN, "<&S2" or die; |
520 |
|
|
open STDOUT, ">&S2" or die; |
521 |
|
|
exec $0, "--slave"; |
522 |
|
|
exit 255; |
523 |
|
|
} |
524 |
root |
1.2 |
close S2; |
525 |
|
|
async \&main; |
526 |
root |
1.1 |
handle_commands unblock \*S1; |
527 |
|
|
} |
528 |
|
|
} |
529 |
|
|
|