1 # Copyright (C) 2015-2019 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # Each instance of this represents a NNTP client socket
5 package PublicInbox::NNTP;
8 use base qw(PublicInbox::DS);
9 use fields qw(nntpd article ng);
10 use PublicInbox::Search;
11 use PublicInbox::Msgmap;
12 use PublicInbox::MID qw(mid_escape);
14 require PublicInbox::EvCleanup;
16 use POSIX qw(strftime);
17 PublicInbox::DS->import(qw(now msg_more));
18 use Digest::SHA qw(sha1_hex);
19 use Time::Local qw(timegm timelocal);
21 r501 => '501 command syntax error',
22 r221 => '221 Header follows',
23 r224 => '224 Overview information follows (multi-line)',
24 r225 => '225 Headers follow (multi-line)',
25 r430 => '430 No article with that message-id',
27 use PublicInbox::Syscall qw(EPOLLIN EPOLLONESHOT);
30 my @OVERVIEW = qw(Subject From Date Message-ID References Xref);
31 my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines)) . ":\r\n";
32 my $LIST_HEADERS = join("\r\n", @OVERVIEW,
33 qw(:bytes :lines Xref To Cc)) . "\r\n";
35 # disable commands with easy DoS potential:
36 my %DISABLED; # = map { $_ => 1 } qw(xover list_overview_fmt newnews xhdr);
38 my $EXPMAP; # fd -> [ idle_time, $self ]
40 our $EXPTIME = 180; # 3 minutes
42 sub update_idle_time ($) {
44 my $sock = $self->{sock} or return;
45 $EXPMAP->{fileno($sock)} = [ now(), $self ];
51 my $old = $now - $exp;
54 while (my ($fd, $v) = each %$EXPMAP) {
55 my ($idle_time, $nntp) = @$v;
56 if ($idle_time < $old) {
67 $expt = PublicInbox::EvCleanup::later(*expire_old) if $nr;
70 sub greet ($) { $_[0]->write($_[0]->{nntpd}->{greet}) };
73 my ($class, $sock, $nntpd) = @_;
74 my $self = fields::new($class);
77 if (ref($sock) eq 'IO::Socket::SSL' && !$sock->accept_SSL) {
78 return CORE::close($sock) if $! != EAGAIN;
79 $ev = PublicInbox::TLS::epollbit();
80 $wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
82 $self->SUPER::new($sock, $ev | EPOLLONESHOT);
83 $self->{nntpd} = $nntpd;
85 $self->{wbuf} = $wbuf;
89 update_idle_time($self);
90 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
96 my $tot = prototype $cb;
97 my ($nreq, undef) = split(';', $tot);
98 $nreq = ($nreq =~ tr/$//) - 1;
99 $tot = ($tot =~ tr/$//) - 1;
100 ($argc <= $tot && $argc >= $nreq);
103 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
104 sub process_line ($$) {
106 my ($req, @args) = split(/[ \t]/, $l);
107 return 1 unless defined($req); # skip blank line
111 $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
113 return res($self, '500 command not recognized') unless $req;
114 return res($self, r501) unless args_ok($req, scalar @args);
116 my $res = eval { $req->($self, @args) };
118 if ($err && $self->{sock}) {
121 err($self, 'error from: %s (%s)', $l, $err);
122 $res = '503 program fault - command not performed';
124 return 0 unless defined $res;
129 my ($self, $arg) = @_;
131 return r501 unless $arg eq 'READER';
132 '201 Posting prohibited';
135 sub cmd_slave ($) { '202 slave status noted' }
137 sub cmd_xgtitle ($;$) {
138 my ($self, $wildmat) = @_;
139 more($self, '282 list of groups and descriptions follows');
140 list_newsgroups($self, $wildmat);
144 sub list_overview_fmt ($) {
146 msg_more($self, $OVERVIEW_FMT);
149 sub list_headers ($;$) {
151 msg_more($self, $LIST_HEADERS);
154 sub list_active ($;$) {
155 my ($self, $wildmat) = @_;
156 wildmat2re($wildmat);
157 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
158 $ng->{newsgroup} =~ $wildmat or next;
159 group_line($self, $ng);
163 sub list_active_times ($;$) {
164 my ($self, $wildmat) = @_;
165 wildmat2re($wildmat);
166 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
167 $ng->{newsgroup} =~ $wildmat or next;
168 my $c = eval { $ng->mm->created_at } || time;
169 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
173 sub list_newsgroups ($;$) {
174 my ($self, $wildmat) = @_;
175 wildmat2re($wildmat);
176 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
177 $ng->{newsgroup} =~ $wildmat or next;
178 my $d = $ng->description;
179 more($self, "$ng->{newsgroup} $d");
183 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
184 sub cmd_list ($;$$) {
185 my ($self, @args) = @_;
187 my $arg = shift @args;
188 $arg =~ tr/A-Z./a-z_/;
190 return r501 if $DISABLED{$arg};
196 return r501 unless $arg && args_ok($arg, scalar @args);
197 more($self, '215 information follows');
198 $arg->($self, @args);
200 more($self, '215 list of newsgroups follows');
201 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
202 group_line($self, $ng);
208 sub cmd_listgroup ($;$) {
209 my ($self, $group) = @_;
210 if (defined $group) {
211 my $res = cmd_group($self, $group);
212 return $res if ($res !~ /\A211 /);
216 $self->{ng} or return '412 no newsgroup selected';
218 long_response($self, sub {
219 my $ary = $self->{ng}->mm->ids_after(\$n);
220 scalar @$ary or return;
221 more($self, join("\r\n", @$ary));
226 sub parse_time ($$;$) {
227 my ($date, $time, $gmt) = @_;
228 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
230 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
233 my @now = $gmt ? gmtime : localtime;
234 my ($YYYY, $MM, $DD);
235 if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD
236 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
237 } else { # legacy clients send YYMMDD
238 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
239 my $cur_year = $now[5] + 1900;
240 if ($YYYY > $cur_year) {
241 $YYYY += int($cur_year / 1000) * 1000 - 100;
245 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
247 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
251 sub group_line ($$) {
252 my ($self, $ng) = @_;
253 my ($min, $max) = $ng->mm->minmax;
254 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
257 sub cmd_newgroups ($$$;$$) {
258 my ($self, $date, $time, $gmt, $dists) = @_;
259 my $ts = eval { parse_time($date, $time, $gmt) };
263 more($self, '231 list of new newsgroups follows');
264 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
265 my $c = eval { $ng->mm->created_at } || 0;
266 next unless $c > $ts;
267 group_line($self, $ng);
272 sub wildmat2re (;$) {
273 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
278 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
280 my $key = sha1_hex($orig . $salt);
281 $orig =~ s/([^\w\-])+/\Q$1/g;
285 my %map = ('*' => '.*', '?' => '.' );
286 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
288 $tmp =~ s#([a-f0-9]{40})#
289 my $orig = $keep{$1};
290 defined $orig ? $orig : $1;
293 $_[0] = qr/\A$tmp\z/;
297 return $_[0] = qr/\A\z/ unless defined $_[0];
298 my %map = ('*' => '.*', ',' => '|');
299 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
300 $_[0] = qr/\A(?:$_[0])\z/;
303 sub cmd_newnews ($$$$;$$) {
304 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
305 my $ts = eval { parse_time($date, $time, $gmt) };
307 more($self, '230 list of new articles by message-id follows');
308 my ($keep, $skip) = split('!', $newsgroups, 2);
312 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
313 $ng->{newsgroup} =~ $keep or next;
314 $ng->{newsgroup} =~ $skip and next;
315 my $over = $ng->over or next;
318 return '.' unless @over;
321 long_response($self, sub {
323 my $msgs = $over->query_ts($ts, $prev);
326 join(">\r\n<", map { $_->mid } @$msgs ).
328 $prev = $msgs->[-1]->{num};
331 if (@over) { # continue onto next newsgroup
334 } else { # break out of the long response.
342 my ($self, $group) = @_;
343 my $no_such = '411 no such news group';
344 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
347 my ($min, $max) = $ng->mm->minmax;
350 $self->{article} = $min;
351 my $est_size = $max - $min;
352 "211 $est_size $min $max $group";
355 sub article_adj ($$) {
356 my ($self, $off) = @_;
357 my $ng = $self->{ng} or return '412 no newsgroup selected';
359 my $n = $self->{article};
360 defined $n or return '420 no current article has been selected';
363 my $mid = $ng->mm->mid_for($n);
365 $n = $off > 0 ? 'next' : 'previous';
366 return "421 no $n article in this group";
368 $self->{article} = $n;
369 "223 $n <$mid> article retrieved - request text separately";
372 sub cmd_next ($) { article_adj($_[0], 1) }
373 sub cmd_last ($) { article_adj($_[0], -1) }
375 # We want to encourage using email and CC-ing everybody involved to avoid
376 # the single-point-of-failure a single server provides.
379 my $ng = $self->{ng};
380 $ng ? "440 mailto:$ng->{-primary_address} to post"
381 : '440 posting not allowed'
386 res($self, '205 closing connection - goodbye!');
391 sub header_append ($$$) {
392 my ($hdr, $k, $v) = @_;
393 my @v = $hdr->header($k);
397 $hdr->header_set($k, @v, $v);
401 my ($self, $ng, $n, $mid) = @_;
402 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
404 # num_for is pretty cheap and sometimes we'll lookup the existence
405 # of an article without getting even the OVER info. In other words,
406 # I'm not sure if its worth optimizing by scanning To:/Cc: and
407 # PublicInbox::ExtMsg on the PSGI end is just as expensive
408 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
409 next if $ng eq $other;
410 my $num = eval { $other->mm->num_for($mid) } or next;
411 $ret .= " $other->{newsgroup}:$num";
416 sub set_nntp_headers ($$$$$) {
417 my ($self, $hdr, $ng, $n, $mid) = @_;
419 # why? leafnode requires a Path: header for some inexplicable
420 # reason. We'll fake the shortest one possible.
421 $hdr->header_set('Path', 'y');
423 # leafnode (and maybe other NNTP clients) have trouble dealing
424 # with v2 messages which have multiple Message-IDs (either due
425 # to our own content-based dedupe or buggy git-send-email versions).
426 my @mids = $hdr->header('Message-ID');
427 if (scalar(@mids) > 1) {
429 $hdr->header_set('Message-ID', $mid0);
430 my @alt = $hdr->header('X-Alt-Message-ID');
431 my %seen = map { $_ => 1 } (@alt, $mid0);
432 foreach my $m (@mids) {
436 $hdr->header_set('X-Alt-Message-ID', @alt);
440 my $xref = xref($self, $ng, $n, $mid);
441 $hdr->header_set('Xref', $xref);
442 $xref =~ s/:[0-9]+//g;
443 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
444 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
445 if (my $url = $ng->base_url) {
446 $mid = mid_escape($mid);
447 header_append($hdr, 'Archived-At', "<$url$mid/>");
448 header_append($hdr, 'List-Archive', "<$url>");
452 sub art_lookup ($$$) {
453 my ($self, $art, $set_headers) = @_;
454 my $ng = $self->{ng};
458 if ($art =~ /\A[0-9]+\z/) {
459 $err = '423 no such article number in this group';
462 } elsif ($art =~ /\A<([^>]+)>\z/) {
465 $n = $ng->mm->num_for($mid) if $ng;
466 goto found if defined $n;
467 foreach my $g (values %{$self->{nntpd}->{groups}}) {
468 $n = $g->mm->num_for($mid);
479 $err = '420 no current article has been selected';
480 $n = $self->{article};
481 defined $n or return $err;
483 $ng or return '412 no newsgroup has been selected';
484 $mid = $ng->mm->mid_for($n);
485 defined $mid or return $err;
488 my $smsg = $ng->over->get_art($n) or return $err;
489 my $msg = $ng->msg_by_smsg($smsg) or return $err;
490 my $s = Email::Simple->new($msg);
492 set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
495 $s->body_set('') if ($set_headers == 2);
497 [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
500 sub simple_body_write ($$) {
504 $body =~ s/^\./../smg;
505 $body =~ s/(?<!\r)\n/\r\n/sg;
506 msg_more($self, $body);
507 msg_more($self, "\r\n") unless $body =~ /\r\n\z/s;
512 my ($self, $art) = @_;
513 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
517 my $hdr = $_[0]->header_obj->as_string;
519 $hdr =~ s/(?<!\r)\n/\r\n/sg;
521 # for leafnode compatibility, we need to ensure Message-ID headers
522 # are only a single line. We can't subclass Email::Simple::Header
523 # and override _default_fold_at in here, either; since that won't
524 # affect messages already in the archive.
525 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
530 sub cmd_article ($;$) {
531 my ($self, $art) = @_;
532 my $r = art_lookup($self, $art, 1);
533 return $r unless ref $r;
534 my ($n, $mid, $s) = @$r;
535 set_art($self, $art);
536 more($self, "220 $n <$mid> article retrieved - head and body follow");
537 msg_more($self, _header($s));
538 msg_more($self, "\r\n");
539 simple_body_write($self, $s);
543 my ($self, $art) = @_;
544 my $r = art_lookup($self, $art, 2);
545 return $r unless ref $r;
546 my ($n, $mid, $s) = @$r;
547 set_art($self, $art);
548 more($self, "221 $n <$mid> article retrieved - head follows");
549 msg_more($self, _header($s));
554 my ($self, $art) = @_;
555 my $r = art_lookup($self, $art, 0);
556 return $r unless ref $r;
557 my ($n, $mid, $s) = @$r;
558 set_art($self, $art);
559 more($self, "222 $n <$mid> article retrieved - body follows");
560 simple_body_write($self, $s);
564 my ($self, $art) = @_;
565 my $r = art_lookup($self, $art, 0);
566 return $r unless ref $r;
567 my ($n, $mid, undef) = @$r;
568 set_art($self, $art);
569 "223 $n <$mid> article retrieved - request text separately";
572 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
574 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
578 more($self, '100 help text follows');
583 my ($self, $range) = @_;
584 my $ng = $self->{ng} or return '412 no news group has been selected';
585 defined $range or return '420 No article(s) selected';
587 my ($min, $max) = $ng->mm->minmax;
588 if ($range =~ /\A([0-9]+)\z/) {
590 } elsif ($range =~ /\A([0-9]+)-\z/) {
591 ($beg, $end) = ($1, $max);
592 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
593 ($beg, $end) = ($1, $2);
597 $beg = $min if ($beg < $min);
598 $end = $max if ($end > $max);
599 return '420 No article(s) selected' if ($beg > $end);
603 sub long_response ($$) {
604 my ($self, $cb) = @_; # cb returns true if more, false if done
606 my $fd = fileno($self->{sock});
607 defined $fd or return;
608 # make sure we disable reading during a long response,
609 # clients should not be sending us stuff and making us do more
610 # work while we are stream a response to them
612 my $long_cb; # DANGER: self-referential
614 # wbuf is unset or empty, here; $cb may add to it
615 my $more = eval { $cb->() };
616 if ($@ || !$self->{sock}) { # something bad happened...
618 my $diff = now() - $t0;
621 "%s during long response[$fd] - %0.6f",
624 out($self, " deferred[$fd] aborted - %0.6f", $diff);
626 } elsif ($more) { # $self->{wbuf}:
627 update_idle_time($self);
629 # no recursion, schedule another call ASAP
630 # but only after all pending writes are done
631 my $wbuf = $self->{wbuf} ||= [];
632 push @$wbuf, $long_cb;
634 # wbuf may be populated by $cb, no need to rearm if so:
635 $self->requeue if scalar(@$wbuf) == 1;
639 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
640 $self->requeue unless $self->{wbuf};
643 $self->write($long_cb); # kick off!
647 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
648 my ($self, $xhdr, $range) = @_;
650 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
651 my ($ng, $n) = mid_lookup($self, $1);
652 return r430 unless $n;
653 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
654 } else { # numeric range
655 $range = $self->{article} unless defined $range;
656 my $r = get_range($self, $range);
657 return $r unless ref $r;
658 my $mm = $self->{ng}->mm;
659 my ($beg, $end) = @$r;
660 more($self, $xhdr ? r221 : r225);
661 long_response($self, sub {
662 my $r = $mm->msg_range(\$beg, $end);
664 more($self, join("\r\n", map {
672 sub mid_lookup ($$) {
673 my ($self, $mid) = @_;
674 my $self_ng = $self->{ng};
676 my $n = $self_ng->mm->num_for($mid);
677 return ($self_ng, $n) if defined $n;
679 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
680 next if defined $self_ng && $ng eq $self_ng;
681 my $n = $ng->mm->num_for($mid);
682 return ($ng, $n) if defined $n;
687 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
688 my ($self, $xhdr, $range) = @_;
690 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
692 my ($ng, $n) = mid_lookup($self, $mid);
693 return r430 unless $n;
694 hdr_mid_response($self, $xhdr, $ng, $n, $range,
695 xref($self, $ng, $n, $mid));
696 } else { # numeric range
697 $range = $self->{article} unless defined $range;
698 my $r = get_range($self, $range);
699 return $r unless ref $r;
700 my $ng = $self->{ng};
702 my ($beg, $end) = @$r;
703 more($self, $xhdr ? r221 : r225);
704 long_response($self, sub {
705 my $r = $mm->msg_range(\$beg, $end);
707 more($self, join("\r\n", map {
709 "$num ".xref($self, $ng, $num, $_->[1]);
716 sub over_header_for {
717 my ($over, $num, $field) = @_;
718 my $smsg = $over->get_art($num) or return;
719 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
723 sub hdr_searchmsg ($$$$) {
724 my ($self, $xhdr, $field, $range) = @_;
725 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
726 my ($ng, $n) = mid_lookup($self, $1);
727 return r430 unless defined $n;
728 my $v = over_header_for($ng->over, $n, $field);
729 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
730 } else { # numeric range
731 $range = $self->{article} unless defined $range;
732 my $over = $self->{ng}->over;
733 my $mm = $self->{ng}->mm;
734 my $r = get_range($self, $range);
735 return $r unless ref $r;
736 my ($beg, $end) = @$r;
737 more($self, $xhdr ? r221 : r225);
739 long_response($self, sub {
740 my $msgs = $over->query_xover($cur, $end);
741 my $nr = scalar @$msgs or return;
743 foreach my $s (@$msgs) {
744 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
747 msg_more($self, $tmp);
748 $cur = $msgs->[-1]->{num} + 1;
754 my ($self, $xhdr, $header, $range) = @_;
755 my $sub = lc $header;
756 if ($sub eq 'message-id') {
757 hdr_message_id($self, $xhdr, $range);
758 } elsif ($sub eq 'xref') {
759 hdr_xref($self, $xhdr, $range);
760 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
762 hdr_searchmsg($self, $xhdr, $sub, $range);
763 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
764 hdr_searchmsg($self, $xhdr, $1, $range);
766 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
772 my ($self, $header, $range) = @_;
773 do_hdr($self, 0, $header, $range);
777 sub cmd_xhdr ($$;$) {
778 my ($self, $header, $range) = @_;
779 do_hdr($self, 1, $header, $range);
782 sub hdr_mid_prefix ($$$$$) {
783 my ($self, $xhdr, $ng, $n, $mid) = @_;
784 return $mid if $xhdr;
786 # HDR for RFC 3977 users
787 if (my $self_ng = $self->{ng}) {
788 ($self_ng eq $ng) ? $n : '0';
794 sub hdr_mid_response ($$$$$$) {
795 my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result
798 $res .= r221 . "\r\n";
799 $res .= "$mid $v\r\n";
801 $res .= r225 . "\r\n";
802 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
803 $res .= "$pfx $v\r\n";
805 res($self, $res .= '.');
809 sub cmd_xrover ($;$) {
810 my ($self, $range) = @_;
811 my $ng = $self->{ng} or return '412 no newsgroup selected';
812 (defined $range && $range =~ /[<>]/) and
813 return '420 No article(s) selected'; # no message IDs
815 $range = $self->{article} unless defined $range;
816 my $r = get_range($self, $range);
817 return $r unless ref $r;
818 my ($beg, $end) = @$r;
820 my $over = $ng->over;
821 more($self, '224 Overview information follows');
823 long_response($self, sub {
824 my $h = over_header_for($over, $beg, 'references');
825 more($self, "$beg $h") if defined($h);
830 sub over_line ($$$$) {
831 my ($self, $ng, $num, $smsg) = @_;
832 # n.b. field access and procedural calls can be
833 # 10%-15% faster than OO method calls:
834 my $s = join("\t", $num,
837 PublicInbox::SearchMsg::date($smsg),
842 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
848 my ($self, $range) = @_;
849 if ($range && $range =~ /\A<(.+)>\z/) {
850 my ($ng, $n) = mid_lookup($self, $1);
851 defined $n or return r430;
852 my $smsg = $ng->over->get_art($n) or return r430;
853 more($self, '224 Overview information follows (multi-line)');
855 # Only set article number column if it's the current group
856 my $self_ng = $self->{ng};
857 $n = 0 if (!$self_ng || $self_ng ne $ng);
858 more($self, over_line($self, $ng, $n, $smsg));
861 cmd_xover($self, $range);
865 sub cmd_xover ($;$) {
866 my ($self, $range) = @_;
867 $range = $self->{article} unless defined $range;
868 my $r = get_range($self, $range);
869 return $r unless ref $r;
870 my ($beg, $end) = @$r;
871 more($self, "224 Overview information follows for $beg to $end");
872 my $over = $self->{ng}->over;
874 long_response($self, sub {
875 my $msgs = $over->query_xover($cur, $end);
876 my $nr = scalar @$msgs or return;
879 more($self, join("\r\n", map {
880 over_line($self, $self->{ng}, $_->{num}, $_);
882 $cur = $msgs->[-1]->{num} + 1;
886 sub cmd_starttls ($) {
888 my $sock = $self->{sock} or return;
890 (ref($sock) eq 'IO::Socket::SSL') and return '502 Command unavailable';
891 my $opt = $self->{nntpd}->{accept_tls} or
892 return '580 can not initiate TLS negotiation';
893 res($self, '382 Continue with TLS negotiation');
894 $self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt);
895 $self->requeue if PublicInbox::DS::accept_tls_step($self);
900 my ($self, $mid) = @_;
901 return r501 unless $mid =~ /\A<(.+)>\z/;
904 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
905 my $n = $ng->mm->num_for($mid);
906 push @paths, "$ng->{newsgroup}/$n" if defined $n;
908 return '430 no such article on server' unless @paths;
909 '223 '.join(' ', @paths);
912 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
914 sub more ($$) { msg_more($_[0], $_[1] . "\r\n") }
918 my $done = $self->write(\($_[1]));
919 return 0 unless $self->{sock};
925 my ($self, $fmt, @args) = @_;
926 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
930 my ($self, $fmt, @args) = @_;
931 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
934 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
938 return unless $self->flush_write && $self->{sock};
940 update_idle_time($self);
941 # only read more requests if we've drained the write buffer,
942 # otherwise we can be buffering infinitely w/o backpressure
944 use constant LINE_MAX => 512; # RFC 977 section 2.3
945 my $rbuf = $self->{rbuf} // (\(my $x = ''));
948 if (index($$rbuf, "\n") < 0) {
949 my $off = bytes::length($$rbuf);
950 $r = $self->do_read($rbuf, LINE_MAX, $off) or return;
952 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
954 return $self->close if $line =~ /[[:cntrl:]]/s;
956 my $fd = fileno($self->{sock});
957 $r = eval { process_line($self, $line) };
958 my $pending = $self->{wbuf} ? ' pending' : '';
959 out($self, "[$fd] %s - %0.6f$pending", $line, now() - $t0);
962 return $self->close if $r < 0;
963 my $len = bytes::length($$rbuf);
964 return $self->close if ($len >= LINE_MAX);
965 $self->rbuf_idle($rbuf);
966 update_idle_time($self);
968 # maybe there's more pipelined data, or we'll have
969 # to register it for socket-readiness notifications
970 $self->requeue unless $self->{wbuf};
973 sub not_idle_long ($$) {
974 my ($self, $now) = @_;
975 my $sock = $self->{sock} or return;
976 my $ary = $EXPMAP->{fileno($sock)} or return;
977 my $exp_at = $ary->[0] + $EXPTIME;
981 # for graceful shutdown in PublicInbox::Daemon:
983 my ($self, $now) = @_;
984 ($self->{rbuf} || $self->{wbuf} || not_idle_long($self, $now));