# Copyright (C) 2015-2018 all contributors
# License: AGPL-3.0+
#
# Each instance of this represents a NNTP client socket
package PublicInbox::NNTP;
use strict;
use warnings;
use base qw(Danga::Socket);
use fields qw(nntpd article rbuf ng long_res);
use PublicInbox::Search;
use PublicInbox::Msgmap;
use PublicInbox::MID qw(mid_escape);
use PublicInbox::Git;
require PublicInbox::EvCleanup;
use Email::Simple;
use POSIX qw(strftime);
use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
use Digest::SHA qw(sha1_hex);
use Time::Local qw(timegm timelocal);
use constant {
r501 => '501 command syntax error',
r221 => '221 Header follows',
r224 => '224 Overview information follows (multi-line)',
r225 => '225 Headers follow (multi-line)',
r430 => '430 No article with that message-id',
long_response_limit => 0xffffffff,
};
sub now () { clock_gettime(CLOCK_MONOTONIC) };
my @OVERVIEW = qw(Subject From Date Message-ID References);
my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines)) . ":\r\n";
my $LIST_HEADERS = join("\r\n", @OVERVIEW,
qw(:bytes :lines Xref To Cc)) . "\r\n";
# disable commands with easy DoS potential:
my %DISABLED; # = map { $_ => 1 } qw(xover list_overview_fmt newnews xhdr);
my $EXPMAP; # fd -> [ idle_time, $self ]
my $expt;
our $EXPTIME = 180; # 3 minutes
my $nextt;
my $nextq = [];
sub next_tick () {
$nextt = undef;
my $q = $nextq;
$nextq = [];
foreach my $nntp (@$q) {
# for request && response protocols, always finish writing
# before finishing reading:
if (my $long_cb = $nntp->{long_res}) {
$nntp->write($long_cb);
} elsif (&Danga::Socket::POLLIN & $nntp->{event_watch}) {
event_read($nntp);
}
}
}
sub update_idle_time ($) {
my ($self) = @_;
my $fd = $self->{fd};
defined $fd and $EXPMAP->{$fd} = [ now(), $self ];
}
sub expire_old () {
my $now = now();
my $exp = $EXPTIME;
my $old = $now - $exp;
my $nr = 0;
my %new;
while (my ($fd, $v) = each %$EXPMAP) {
my ($idle_time, $nntp) = @$v;
if ($idle_time < $old) {
$nntp->close; # idempotent
} else {
++$nr;
$new{$fd} = $v;
}
}
$EXPMAP = \%new;
if ($nr) {
$expt = PublicInbox::EvCleanup::later(*expire_old);
} else {
$expt = undef;
# noop to kick outselves out of the loop ASAP so descriptors
# really get closed
PublicInbox::EvCleanup::asap(sub {});
}
}
sub new ($$$) {
my ($class, $sock, $nntpd) = @_;
my $self = fields::new($class);
$self->SUPER::new($sock);
$self->{nntpd} = $nntpd;
res($self, '201 server ready - post via email');
$self->{rbuf} = '';
$self->watch_read(1);
update_idle_time($self);
$expt ||= PublicInbox::EvCleanup::later(*expire_old);
$self;
}
sub args_ok ($$) {
my ($cb, $argc) = @_;
my $tot = prototype $cb;
my ($nreq, undef) = split(';', $tot);
$nreq = ($nreq =~ tr/$//) - 1;
$tot = ($tot =~ tr/$//) - 1;
($argc <= $tot && $argc >= $nreq);
}
# returns 1 if we can continue, 0 if not due to buffered writes or disconnect
sub process_line ($$) {
my ($self, $l) = @_;
my ($req, @args) = split(/\s+/, $l);
return unless defined($req);
$req = lc($req);
$req = eval {
no strict 'refs';
$req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
};
return res($self, '500 command not recognized') unless $req;
return res($self, r501) unless args_ok($req, scalar @args);
my $res = eval { $req->($self, @args) };
my $err = $@;
if ($err && !$self->{closed}) {
local $/ = "\n";
chomp($l);
err($self, 'error from: %s (%s)', $l, $err);
$res = '503 program fault - command not performed';
}
return 0 unless defined $res;
res($self, $res);
}
sub cmd_mode ($$) {
my ($self, $arg) = @_;
$arg = uc $arg;
return r501 unless $arg eq 'READER';
'201 Posting prohibited';
}
sub cmd_slave ($) { '202 slave status noted' }
sub cmd_xgtitle ($;$) {
my ($self, $wildmat) = @_;
more($self, '282 list of groups and descriptions follows');
list_newsgroups($self, $wildmat);
'.'
}
sub list_overview_fmt ($) {
my ($self) = @_;
do_more($self, $OVERVIEW_FMT);
}
sub list_headers ($;$) {
my ($self) = @_;
do_more($self, $LIST_HEADERS);
}
sub list_active ($;$) {
my ($self, $wildmat) = @_;
wildmat2re($wildmat);
foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
$ng->{newsgroup} =~ $wildmat or next;
group_line($self, $ng);
}
}
sub list_active_times ($;$) {
my ($self, $wildmat) = @_;
wildmat2re($wildmat);
foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
$ng->{newsgroup} =~ $wildmat or next;
my $c = eval { $ng->mm->created_at } || time;
more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
}
}
sub list_newsgroups ($;$) {
my ($self, $wildmat) = @_;
wildmat2re($wildmat);
foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
$ng->{newsgroup} =~ $wildmat or next;
my $d = $ng->description;
more($self, "$ng->{newsgroup} $d");
}
}
# LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
sub cmd_list ($;$$) {
my ($self, @args) = @_;
if (scalar @args) {
my $arg = shift @args;
$arg =~ tr/A-Z./a-z_/;
$arg = "list_$arg";
return r501 if $DISABLED{$arg};
$arg = eval {
no strict 'refs';
*{$arg}{CODE};
};
return r501 unless $arg && args_ok($arg, scalar @args);
more($self, '215 information follows');
$arg->($self, @args);
} else {
more($self, '215 list of newsgroups follows');
foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
group_line($self, $ng);
}
}
'.'
}
sub cmd_listgroup ($;$) {
my ($self, $group) = @_;
if (defined $group) {
my $res = cmd_group($self, $group);
return $res if ($res !~ /\A211 /);
more($self, $res);
}
$self->{ng} or return '412 no newsgroup selected';
my $n = 0;
long_response($self, sub {
my $ary = $self->{ng}->mm->ids_after(\$n);
scalar @$ary or return;
more($self, join("\r\n", @$ary));
1;
});
}
sub parse_time ($$;$) {
my ($date, $time, $gmt) = @_;
my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
if (defined $gmt) {
$gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
$gmt = 1;
}
my @now = $gmt ? gmtime : localtime;
my ($YYYY, $MM, $DD);
if (length($date) == 8) { # RFC 3977 allows YYYYMMDD
($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
} else { # legacy clients send YYMMDD
($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
my $cur_year = $now[5] + 1900;
if ($YYYY > $cur_year) {
$YYYY += int($cur_year / 1000) * 1000 - 100;
}
}
if ($gmt) {
timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
} else {
timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
}
}
sub group_line ($$) {
my ($self, $ng) = @_;
my ($min, $max) = $ng->mm->minmax;
more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
}
sub cmd_newgroups ($$$;$$) {
my ($self, $date, $time, $gmt, $dists) = @_;
my $ts = eval { parse_time($date, $time, $gmt) };
return r501 if $@;
# TODO dists
more($self, '231 list of new newsgroups follows');
foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
my $c = eval { $ng->mm->created_at } || 0;
next unless $c > $ts;
group_line($self, $ng);
}
'.'
}
sub wildmat2re (;$) {
return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
my %keep;
my $salt = rand;
my $tmp = $_[0];
$tmp =~ s#(? '.*', '?' => '.' );
$tmp =~ s#(? '.*', ',' => '|');
$_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
$_[0] = qr/\A(?:$_[0])\z/;
}
sub cmd_newnews ($$$$;$$) {
my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
my $ts = eval { parse_time($date, $time, $gmt) };
return r501 if $@;
more($self, '230 list of new articles by message-id follows');
my ($keep, $skip) = split('!', $newsgroups, 2);
ngpat2re($keep);
ngpat2re($skip);
my @srch;
foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
$ng->{newsgroup} =~ $keep or next;
$ng->{newsgroup} =~ $skip and next;
my $srch = $ng->search or next;
push @srch, $srch;
};
return '.' unless @srch;
my $prev = 0;
long_response($self, sub {
my $srch = $srch[0];
my $msgs = $srch->query_ts($ts, $prev);
if (scalar @$msgs) {
more($self, '<' .
join(">\r\n<", map { $_->mid } @$msgs ).
'>');
$prev = $msgs->[-1]->{num};
} else {
shift @srch;
if (@srch) { # continue onto next newsgroup
$prev = 0;
return 1;
} else { # break out of the long response.
return;
}
}
});
}
sub cmd_group ($$) {
my ($self, $group) = @_;
my $no_such = '411 no such news group';
my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
$self->{ng} = $ng;
my ($min, $max) = $ng->mm->minmax;
$min ||= 0;
$max ||= 0;
$self->{article} = $min;
my $est_size = $max - $min;
"211 $est_size $min $max $group";
}
sub article_adj ($$) {
my ($self, $off) = @_;
my $ng = $self->{ng} or return '412 no newsgroup selected';
my $n = $self->{article};
defined $n or return '420 no current article has been selected';
$n += $off;
my $mid = $ng->mm->mid_for($n);
unless ($mid) {
$n = $off > 0 ? 'next' : 'previous';
return "421 no $n article in this group";
}
$self->{article} = $n;
"223 $n <$mid> article retrieved - request text separately";
}
sub cmd_next ($) { article_adj($_[0], 1) }
sub cmd_last ($) { article_adj($_[0], -1) }
# We want to encourage using email and CC-ing everybody involved to avoid
# the single-point-of-failure a single server provides.
sub cmd_post ($) {
my ($self) = @_;
my $ng = $self->{ng};
$ng ? "440 mailto:$ng->{-primary_address} to post"
: '440 posting not allowed'
}
sub cmd_quit ($) {
my ($self) = @_;
res($self, '205 closing connection - goodbye!');
$self->close;
undef;
}
sub header_append ($$$) {
my ($hdr, $k, $v) = @_;
my @v = $hdr->header($k);
foreach (@v) {
return if $v eq $_;
}
$hdr->header_set($k, @v, $v);
}
sub xref ($$$$) {
my ($self, $ng, $n, $mid) = @_;
my $ret = "$ng->{domain} $ng->{newsgroup}:$n";
# num_for is pretty cheap and sometimes we'll lookup the existence
# of an article without getting even the OVER info. In other words,
# I'm not sure if its worth optimizing by scanning To:/Cc: and
# PublicInbox::ExtMsg on the PSGI end is just as expensive
foreach my $other (@{$self->{nntpd}->{grouplist}}) {
next if $ng eq $other;
my $num = eval { $other->mm->num_for($mid) } or next;
$ret .= " $other->{newsgroup}:$num";
}
$ret;
}
sub set_nntp_headers ($$$$$) {
my ($self, $hdr, $ng, $n, $mid) = @_;
# clobber some
my $xref = xref($self, $ng, $n, $mid);
$hdr->header_set('Xref', $xref);
$xref =~ s/:\d+//g;
$hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
header_append($hdr, 'List-Post', "{-primary_address}>");
if (my $url = $ng->base_url) {
$mid = mid_escape($mid);
header_append($hdr, 'Archived-At', "<$url$mid/>");
header_append($hdr, 'List-Archive', "<$url>");
}
}
sub art_lookup ($$$) {
my ($self, $art, $set_headers) = @_;
my $ng = $self->{ng};
my ($n, $mid);
my $err;
if (defined $art) {
if ($art =~ /\A\d+\z/o) {
$err = '423 no such article number in this group';
$n = int($art);
goto find_mid;
} elsif ($art =~ /\A<([^>]+)>\z/) {
$mid = $1;
$err = r430;
$n = $ng->mm->num_for($mid) if $ng;
goto found if defined $n;
foreach my $g (values %{$self->{nntpd}->{groups}}) {
$n = $g->mm->num_for($mid);
if (defined $n) {
$ng = $g;
goto found;
}
}
return $err;
} else {
return r501;
}
} else {
$err = '420 no current article has been selected';
$n = $self->{article};
defined $n or return $err;
find_mid:
$ng or return '412 no newsgroup has been selected';
$mid = $ng->mm->mid_for($n);
defined $mid or return $err;
}
found:
my $smsg = $ng->search->{over_ro}->get_art($n) or return $err;
my $msg = $ng->msg_by_smsg($smsg) or return $err;
my $s = Email::Simple->new($msg);
if ($set_headers) {
set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
# must be last
$s->body_set('') if ($set_headers == 2);
}
[ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
}
sub simple_body_write ($$) {
my ($self, $s) = @_;
my $body = $s->body;
$s->body_set('');
$body =~ s/^\./../smg;
$body =~ s/(?{article} = $art if defined $art && $art =~ /\A\d+\z/;
}
sub _header ($) {
my $hdr = $_[0]->header_obj->as_string;
utf8::encode($hdr);
$hdr
}
sub cmd_article ($;$) {
my ($self, $art) = @_;
my $r = art_lookup($self, $art, 1);
return $r unless ref $r;
my ($n, $mid, $s) = @$r;
set_art($self, $art);
more($self, "220 $n <$mid> article retrieved - head and body follow");
do_more($self, _header($s));
do_more($self, "\r\n");
simple_body_write($self, $s);
}
sub cmd_head ($;$) {
my ($self, $art) = @_;
my $r = art_lookup($self, $art, 2);
return $r unless ref $r;
my ($n, $mid, $s) = @$r;
set_art($self, $art);
more($self, "221 $n <$mid> article retrieved - head follows");
do_more($self, _header($s));
'.'
}
sub cmd_body ($;$) {
my ($self, $art) = @_;
my $r = art_lookup($self, $art, 0);
return $r unless ref $r;
my ($n, $mid, $s) = @$r;
set_art($self, $art);
more($self, "222 $n <$mid> article retrieved - body follows");
simple_body_write($self, $s);
}
sub cmd_stat ($;$) {
my ($self, $art) = @_;
my $r = art_lookup($self, $art, 0);
return $r unless ref $r;
my ($n, $mid, undef) = @$r;
set_art($self, $art);
"223 $n <$mid> article retrieved - request text separately";
}
sub cmd_ihave ($) { '435 article not wanted - do not send it' }
sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
sub cmd_help ($) {
my ($self) = @_;
more($self, '100 help text follows');
'.'
}
sub get_range ($$) {
my ($self, $range) = @_;
my $ng = $self->{ng} or return '412 no news group has been selected';
defined $range or return '420 No article(s) selected';
my ($beg, $end);
my ($min, $max) = $ng->mm->minmax;
if ($range =~ /\A(\d+)\z/) {
$beg = $end = $1;
} elsif ($range =~ /\A(\d+)-\z/) {
($beg, $end) = ($1, $max);
} elsif ($range =~ /\A(\d+)-(\d+)\z/) {
($beg, $end) = ($1, $2);
} else {
return r501;
}
$beg = $min if ($beg < $min);
$end = $max if ($end > $max);
return '420 No article(s) selected' if ($beg > $end);
[ $beg, $end ];
}
sub long_response ($$) {
my ($self, $cb) = @_;
die "BUG: nested long response" if $self->{long_res};
my $fd = $self->{fd};
defined $fd or return;
# make sure we disable reading during a long response,
# clients should not be sending us stuff and making us do more
# work while we are stream a response to them
$self->watch_read(0);
my $t0 = now();
$self->{long_res} = sub {
my $more = eval { $cb->() };
if ($@ || $self->{closed}) {
$self->{long_res} = undef;
if ($@) {
err($self,
"%s during long response[$fd] - %0.6f",
$@, now() - $t0);
}
if ($self->{closed}) {
out($self, " deferred[$fd] aborted - %0.6f",
now() - $t0);
} else {
update_idle_time($self);
$self->watch_read(1);
}
} elsif ($more) { # $self->{write_buf_size}:
# no recursion, schedule another call ASAP
# but only after all pending writes are done
update_idle_time($self);
push @$nextq, $self;
$nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
} else { # all done!
$self->{long_res} = undef;
$self->watch_read(1);
res($self, '.');
out($self, " deferred[$fd] done - %0.6f", now() - $t0);
}
};
$self->{long_res}->(); # kick off!
undef;
}
sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
my ($self, $xhdr, $range) = @_;
if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
my ($ng, $n) = mid_lookup($self, $1);
return r430 unless $n;
hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
} else { # numeric range
$range = $self->{article} unless defined $range;
my $r = get_range($self, $range);
return $r unless ref $r;
my $mm = $self->{ng}->mm;
my ($beg, $end) = @$r;
more($self, $xhdr ? r221 : r225);
long_response($self, sub {
my $r = $mm->msg_range(\$beg, $end);
@$r or return;
more($self, join("\r\n", map {
"$_->[0] <$_->[1]>"
} @$r));
1;
});
}
}
sub mid_lookup ($$) {
my ($self, $mid) = @_;
my $self_ng = $self->{ng};
if ($self_ng) {
my $n = $self_ng->mm->num_for($mid);
return ($self_ng, $n) if defined $n;
}
foreach my $ng (values %{$self->{nntpd}->{groups}}) {
next if defined $self_ng && $ng eq $self_ng;
my $n = $ng->mm->num_for($mid);
return ($ng, $n) if defined $n;
}
(undef, undef);
}
sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
my ($self, $xhdr, $range) = @_;
if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
my $mid = $1;
my ($ng, $n) = mid_lookup($self, $mid);
return r430 unless $n;
hdr_mid_response($self, $xhdr, $ng, $n, $range,
xref($self, $ng, $n, $mid));
} else { # numeric range
$range = $self->{article} unless defined $range;
my $r = get_range($self, $range);
return $r unless ref $r;
my $ng = $self->{ng};
my $mm = $ng->mm;
my ($beg, $end) = @$r;
more($self, $xhdr ? r221 : r225);
long_response($self, sub {
my $r = $mm->msg_range(\$beg, $end);
@$r or return;
more($self, join("\r\n", map {
my $num = $_->[0];
"$num ".xref($self, $ng, $num, $_->[1]);
} @$r));
1;
});
}
}
sub search_header_for {
my ($srch, $num, $field) = @_;
my $smsg = $srch->{over_ro}->get_art($num) or return;
return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
$smsg->{$field};
}
sub hdr_searchmsg ($$$$) {
my ($self, $xhdr, $field, $range) = @_;
if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
my ($ng, $n) = mid_lookup($self, $1);
return r430 unless defined $n;
my $v = search_header_for($ng->search, $n, $field);
hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
} else { # numeric range
$range = $self->{article} unless defined $range;
my $srch = $self->{ng}->search;
my $mm = $self->{ng}->mm;
my $r = get_range($self, $range);
return $r unless ref $r;
my ($beg, $end) = @$r;
more($self, $xhdr ? r221 : r225);
my $cur = $beg;
long_response($self, sub {
my $msgs = $srch->query_xover($cur, $end);
my $nr = scalar @$msgs or return;
my $tmp = '';
foreach my $s (@$msgs) {
$tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
}
utf8::encode($tmp);
do_more($self, $tmp);
$cur = $msgs->[-1]->{num} + 1;
});
}
}
sub do_hdr ($$$;$) {
my ($self, $xhdr, $header, $range) = @_;
my $sub = lc $header;
if ($sub eq 'message-id') {
hdr_message_id($self, $xhdr, $range);
} elsif ($sub eq 'xref') {
hdr_xref($self, $xhdr, $range);
} elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
bytes|lines)\z/x) {
hdr_searchmsg($self, $xhdr, $sub, $range);
} elsif ($sub =~ /\A:(bytes|lines)\z/) {
hdr_searchmsg($self, $xhdr, $1, $range);
} else {
$xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
}
}
# RFC 3977
sub cmd_hdr ($$;$) {
my ($self, $header, $range) = @_;
do_hdr($self, 0, $header, $range);
}
# RFC 2980
sub cmd_xhdr ($$;$) {
my ($self, $header, $range) = @_;
do_hdr($self, 1, $header, $range);
}
sub hdr_mid_prefix ($$$$$) {
my ($self, $xhdr, $ng, $n, $mid) = @_;
return $mid if $xhdr;
# HDR for RFC 3977 users
if (my $self_ng = $self->{ng}) {
($self_ng eq $ng) ? $n : '0';
} else {
'0';
}
}
sub hdr_mid_response ($$$$$$) {
my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result
my $res = '';
if ($xhdr) {
$res .= r221 . "\r\n";
$res .= "$mid $v\r\n";
} else {
$res .= r225 . "\r\n";
my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
$res .= "$pfx $v\r\n";
}
res($self, $res .= '.');
undef;
}
sub cmd_xrover ($;$) {
my ($self, $range) = @_;
my $ng = $self->{ng} or return '412 no newsgroup selected';
(defined $range && $range =~ /[<>]/) and
return '420 No article(s) selected'; # no message IDs
$range = $self->{article} unless defined $range;
my $r = get_range($self, $range);
return $r unless ref $r;
my ($beg, $end) = @$r;
my $mm = $ng->mm;
my $srch = $ng->search;
more($self, '224 Overview information follows');
long_response($self, sub {
my $h = search_header_for($srch, $beg, 'references');
more($self, "$beg $h") if defined($h);
$beg++ < $end;
});
}
sub over_line ($$) {
my ($num, $smsg) = @_;
# n.b. field access and procedural calls can be
# 10%-15% faster than OO method calls:
my $s = join("\t", $num,
$smsg->{subject},
$smsg->{from},
PublicInbox::SearchMsg::date($smsg),
"<$smsg->{mid}>",
$smsg->{references},
$smsg->{bytes},
$smsg->{lines});
utf8::encode($s);
$s
}
sub cmd_over ($;$) {
my ($self, $range) = @_;
if ($range && $range =~ /\A<(.+)>\z/) {
my ($ng, $n) = mid_lookup($self, $1);
defined $n or return r430;
my $smsg = $ng->search->{over_ro}->get_art($n) or return r430;
more($self, '224 Overview information follows (multi-line)');
# Only set article number column if it's the current group
my $self_ng = $self->{ng};
$n = 0 if (!$self_ng || $self_ng ne $ng);
more($self, over_line($n, $smsg));
'.';
} else {
cmd_xover($self, $range);
}
}
sub cmd_xover ($;$) {
my ($self, $range) = @_;
$range = $self->{article} unless defined $range;
my $r = get_range($self, $range);
return $r unless ref $r;
my ($beg, $end) = @$r;
more($self, "224 Overview information follows for $beg to $end");
my $srch = $self->{ng}->search;
my $cur = $beg;
long_response($self, sub {
my $msgs = $srch->query_xover($cur, $end);
my $nr = scalar @$msgs or return;
# OVERVIEW.FMT
more($self, join("\r\n", map {
over_line($_->{num}, $_);
} @$msgs));
$cur = $msgs->[-1]->{num} + 1;
});
}
sub cmd_xpath ($$) {
my ($self, $mid) = @_;
return r501 unless $mid =~ /\A<(.+)>\z/;
$mid = $1;
my @paths;
foreach my $ng (values %{$self->{nntpd}->{groups}}) {
my $n = $ng->mm->num_for($mid);
push @paths, "$ng->{newsgroup}/$n" if defined $n;
}
return '430 no such article on server' unless @paths;
'223 '.join(' ', @paths);
}
sub res ($$) {
my ($self, $line) = @_;
do_write($self, $line . "\r\n");
}
sub more ($$) {
my ($self, $line) = @_;
do_more($self, $line . "\r\n");
}
sub do_write ($$) {
my ($self, $data) = @_;
my $done = $self->write($data);
return if $self->{closed};
# Do not watch for readability if we have data in the queue,
# instead re-enable watching for readability when we can
$self->watch_read(0) if (!$done || $self->{long_res});
$done;
}
sub err ($$;@) {
my ($self, $fmt, @args) = @_;
printf { $self->{nntpd}->{err} } $fmt."\n", @args;
}
sub out ($$;@) {
my ($self, $fmt, @args) = @_;
printf { $self->{nntpd}->{out} } $fmt."\n", @args;
}
use constant MSG_MORE => ($^O eq 'linux') ? 0x8000 : 0;
sub do_more ($$) {
my ($self, $data) = @_;
if (MSG_MORE && !$self->{write_buf_size}) {
my $n = send($self->{sock}, $data, MSG_MORE);
if (defined $n) {
my $dlen = length($data);
return 1 if $n == $dlen; # all done!
$data = substr($data, $n, $dlen - $n);
}
}
do_write($self, $data);
}
# callbacks for Danga::Socket
sub event_hup { $_[0]->close }
sub event_err { $_[0]->close }
sub event_write {
my ($self) = @_;
update_idle_time($self);
# only continue watching for readability when we are done writing:
if ($self->write(undef) == 1 && !$self->{long_res}) {
$self->watch_read(1);
}
}
sub event_read {
my ($self) = @_;
use constant LINE_MAX => 512; # RFC 977 section 2.3
if (index($self->{rbuf}, "\n") < 0) {
my $buf = $self->read(LINE_MAX) or return $self->close;
$self->{rbuf} .= $$buf;
}
my $r = 1;
while ($r > 0 && $self->{rbuf} =~ s/\A\s*([^\r\n]*)\r?\n//) {
my $line = $1;
return $self->close if $line =~ /[[:cntrl:]]/s;
my $t0 = now();
my $fd = $self->{fd};
$r = eval { process_line($self, $line) };
my $d = $self->{long_res} ?
" deferred[$fd]" : '';
out($self, "[$fd] %s - %0.6f$d", $line, now() - $t0);
}
return $self->close if $r < 0;
my $len = length($self->{rbuf});
return $self->close if ($len >= LINE_MAX);
update_idle_time($self);
}
sub watch_read {
my ($self, $bool) = @_;
my $rv = $self->SUPER::watch_read($bool);
if ($bool && index($self->{rbuf}, "\n") >= 0) {
# Force another read if there is a pipelined request.
# We don't know if the socket has anything for us to read,
# and we must double-check again by the time the timer fires
# in case we really did dispatch a read event and started
# another long response.
push @$nextq, $self;
$nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
}
$rv;
}
sub not_idle_long ($$) {
my ($self, $now) = @_;
defined(my $fd = $self->{fd}) or return;
my $ary = $EXPMAP->{$fd} or return;
my $exp_at = $ary->[0] + $EXPTIME;
$exp_at > $now;
}
# for graceful shutdown in PublicInbox::Daemon:
sub busy {
my ($self, $now) = @_;
($self->{rbuf} ne '' || $self->{long_res} || $self->{write_buf_size} ||
not_idle_long($self, $now));
}
1;