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 - $exp;
55 while (my ($fd, $v) = each %$EXPMAP) {
56 my ($idle_time, $nntp) = @$v;
57 if ($idle_time < $old) {
71 $expt = PublicInbox::EvCleanup::later(*expire_old);
74 # noop to kick outselves out of the loop ASAP so descriptors
76 PublicInbox::EvCleanup::asap(sub {}) if $closed;
80 sub greet ($) { $_[0]->write($_[0]->{nntpd}->{greet}) };
83 my ($class, $sock, $nntpd) = @_;
84 my $self = fields::new($class);
87 if (ref($sock) eq 'IO::Socket::SSL' && !$sock->accept_SSL) {
88 $ev = PublicInbox::TLS::epollbit() or return CORE::close($sock);
89 $wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
91 $self->SUPER::new($sock, $ev | EPOLLONESHOT);
92 $self->{nntpd} = $nntpd;
94 $self->{wbuf} = $wbuf;
98 update_idle_time($self);
99 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
104 my ($cb, $argc) = @_;
105 my $tot = prototype $cb;
106 my ($nreq, undef) = split(';', $tot);
107 $nreq = ($nreq =~ tr/$//) - 1;
108 $tot = ($tot =~ tr/$//) - 1;
109 ($argc <= $tot && $argc >= $nreq);
112 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
113 sub process_line ($$) {
115 my ($req, @args) = split(/[ \t]/, $l);
116 return 1 unless defined($req); # skip blank line
120 $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
122 return res($self, '500 command not recognized') unless $req;
123 return res($self, r501) unless args_ok($req, scalar @args);
125 my $res = eval { $req->($self, @args) };
127 if ($err && $self->{sock}) {
130 err($self, 'error from: %s (%s)', $l, $err);
131 $res = '503 program fault - command not performed';
133 return 0 unless defined $res;
138 my ($self, $arg) = @_;
140 return r501 unless $arg eq 'READER';
141 '201 Posting prohibited';
144 sub cmd_slave ($) { '202 slave status noted' }
146 sub cmd_xgtitle ($;$) {
147 my ($self, $wildmat) = @_;
148 more($self, '282 list of groups and descriptions follows');
149 list_newsgroups($self, $wildmat);
153 sub list_overview_fmt ($) {
155 msg_more($self, $OVERVIEW_FMT);
158 sub list_headers ($;$) {
160 msg_more($self, $LIST_HEADERS);
163 sub list_active ($;$) {
164 my ($self, $wildmat) = @_;
165 wildmat2re($wildmat);
166 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
167 $ng->{newsgroup} =~ $wildmat or next;
168 group_line($self, $ng);
172 sub list_active_times ($;$) {
173 my ($self, $wildmat) = @_;
174 wildmat2re($wildmat);
175 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
176 $ng->{newsgroup} =~ $wildmat or next;
177 my $c = eval { $ng->mm->created_at } || time;
178 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
182 sub list_newsgroups ($;$) {
183 my ($self, $wildmat) = @_;
184 wildmat2re($wildmat);
185 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
186 $ng->{newsgroup} =~ $wildmat or next;
187 my $d = $ng->description;
188 more($self, "$ng->{newsgroup} $d");
192 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
193 sub cmd_list ($;$$) {
194 my ($self, @args) = @_;
196 my $arg = shift @args;
197 $arg =~ tr/A-Z./a-z_/;
199 return r501 if $DISABLED{$arg};
205 return r501 unless $arg && args_ok($arg, scalar @args);
206 more($self, '215 information follows');
207 $arg->($self, @args);
209 more($self, '215 list of newsgroups follows');
210 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
211 group_line($self, $ng);
217 sub cmd_listgroup ($;$) {
218 my ($self, $group) = @_;
219 if (defined $group) {
220 my $res = cmd_group($self, $group);
221 return $res if ($res !~ /\A211 /);
225 $self->{ng} or return '412 no newsgroup selected';
227 long_response($self, sub {
228 my $ary = $self->{ng}->mm->ids_after(\$n);
229 scalar @$ary or return;
230 more($self, join("\r\n", @$ary));
235 sub parse_time ($$;$) {
236 my ($date, $time, $gmt) = @_;
237 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
239 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
242 my @now = $gmt ? gmtime : localtime;
243 my ($YYYY, $MM, $DD);
244 if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD
245 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
246 } else { # legacy clients send YYMMDD
247 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
248 my $cur_year = $now[5] + 1900;
249 if ($YYYY > $cur_year) {
250 $YYYY += int($cur_year / 1000) * 1000 - 100;
254 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
256 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
260 sub group_line ($$) {
261 my ($self, $ng) = @_;
262 my ($min, $max) = $ng->mm->minmax;
263 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
266 sub cmd_newgroups ($$$;$$) {
267 my ($self, $date, $time, $gmt, $dists) = @_;
268 my $ts = eval { parse_time($date, $time, $gmt) };
272 more($self, '231 list of new newsgroups follows');
273 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
274 my $c = eval { $ng->mm->created_at } || 0;
275 next unless $c > $ts;
276 group_line($self, $ng);
281 sub wildmat2re (;$) {
282 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
287 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
289 my $key = sha1_hex($orig . $salt);
290 $orig =~ s/([^\w\-])+/\Q$1/g;
294 my %map = ('*' => '.*', '?' => '.' );
295 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
297 $tmp =~ s#([a-f0-9]{40})#
298 my $orig = $keep{$1};
299 defined $orig ? $orig : $1;
302 $_[0] = qr/\A$tmp\z/;
306 return $_[0] = qr/\A\z/ unless defined $_[0];
307 my %map = ('*' => '.*', ',' => '|');
308 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
309 $_[0] = qr/\A(?:$_[0])\z/;
312 sub cmd_newnews ($$$$;$$) {
313 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
314 my $ts = eval { parse_time($date, $time, $gmt) };
316 more($self, '230 list of new articles by message-id follows');
317 my ($keep, $skip) = split('!', $newsgroups, 2);
321 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
322 $ng->{newsgroup} =~ $keep or next;
323 $ng->{newsgroup} =~ $skip and next;
324 my $over = $ng->over or next;
327 return '.' unless @over;
330 long_response($self, sub {
332 my $msgs = $over->query_ts($ts, $prev);
335 join(">\r\n<", map { $_->mid } @$msgs ).
337 $prev = $msgs->[-1]->{num};
340 if (@over) { # continue onto next newsgroup
343 } else { # break out of the long response.
351 my ($self, $group) = @_;
352 my $no_such = '411 no such news group';
353 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
356 my ($min, $max) = $ng->mm->minmax;
359 $self->{article} = $min;
360 my $est_size = $max - $min;
361 "211 $est_size $min $max $group";
364 sub article_adj ($$) {
365 my ($self, $off) = @_;
366 my $ng = $self->{ng} or return '412 no newsgroup selected';
368 my $n = $self->{article};
369 defined $n or return '420 no current article has been selected';
372 my $mid = $ng->mm->mid_for($n);
374 $n = $off > 0 ? 'next' : 'previous';
375 return "421 no $n article in this group";
377 $self->{article} = $n;
378 "223 $n <$mid> article retrieved - request text separately";
381 sub cmd_next ($) { article_adj($_[0], 1) }
382 sub cmd_last ($) { article_adj($_[0], -1) }
384 # We want to encourage using email and CC-ing everybody involved to avoid
385 # the single-point-of-failure a single server provides.
388 my $ng = $self->{ng};
389 $ng ? "440 mailto:$ng->{-primary_address} to post"
390 : '440 posting not allowed'
395 res($self, '205 closing connection - goodbye!');
400 sub header_append ($$$) {
401 my ($hdr, $k, $v) = @_;
402 my @v = $hdr->header($k);
406 $hdr->header_set($k, @v, $v);
410 my ($self, $ng, $n, $mid) = @_;
411 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
413 # num_for is pretty cheap and sometimes we'll lookup the existence
414 # of an article without getting even the OVER info. In other words,
415 # I'm not sure if its worth optimizing by scanning To:/Cc: and
416 # PublicInbox::ExtMsg on the PSGI end is just as expensive
417 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
418 next if $ng eq $other;
419 my $num = eval { $other->mm->num_for($mid) } or next;
420 $ret .= " $other->{newsgroup}:$num";
425 sub set_nntp_headers ($$$$$) {
426 my ($self, $hdr, $ng, $n, $mid) = @_;
428 # why? leafnode requires a Path: header for some inexplicable
429 # reason. We'll fake the shortest one possible.
430 $hdr->header_set('Path', 'y');
432 # leafnode (and maybe other NNTP clients) have trouble dealing
433 # with v2 messages which have multiple Message-IDs (either due
434 # to our own content-based dedupe or buggy git-send-email versions).
435 my @mids = $hdr->header('Message-ID');
436 if (scalar(@mids) > 1) {
438 $hdr->header_set('Message-ID', $mid0);
439 my @alt = $hdr->header('X-Alt-Message-ID');
440 my %seen = map { $_ => 1 } (@alt, $mid0);
441 foreach my $m (@mids) {
445 $hdr->header_set('X-Alt-Message-ID', @alt);
449 my $xref = xref($self, $ng, $n, $mid);
450 $hdr->header_set('Xref', $xref);
451 $xref =~ s/:[0-9]+//g;
452 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
453 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
454 if (my $url = $ng->base_url) {
455 $mid = mid_escape($mid);
456 header_append($hdr, 'Archived-At', "<$url$mid/>");
457 header_append($hdr, 'List-Archive', "<$url>");
461 sub art_lookup ($$$) {
462 my ($self, $art, $set_headers) = @_;
463 my $ng = $self->{ng};
467 if ($art =~ /\A[0-9]+\z/) {
468 $err = '423 no such article number in this group';
471 } elsif ($art =~ /\A<([^>]+)>\z/) {
474 $n = $ng->mm->num_for($mid) if $ng;
475 goto found if defined $n;
476 foreach my $g (values %{$self->{nntpd}->{groups}}) {
477 $n = $g->mm->num_for($mid);
488 $err = '420 no current article has been selected';
489 $n = $self->{article};
490 defined $n or return $err;
492 $ng or return '412 no newsgroup has been selected';
493 $mid = $ng->mm->mid_for($n);
494 defined $mid or return $err;
497 my $smsg = $ng->over->get_art($n) or return $err;
498 my $msg = $ng->msg_by_smsg($smsg) or return $err;
499 my $s = Email::Simple->new($msg);
501 set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
504 $s->body_set('') if ($set_headers == 2);
506 [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
509 sub simple_body_write ($$) {
513 $body =~ s/^\./../smg;
514 $body =~ s/(?<!\r)\n/\r\n/sg;
515 msg_more($self, $body);
516 msg_more($self, "\r\n") unless $body =~ /\r\n\z/s;
521 my ($self, $art) = @_;
522 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
526 my $hdr = $_[0]->header_obj->as_string;
528 $hdr =~ s/(?<!\r)\n/\r\n/sg;
530 # for leafnode compatibility, we need to ensure Message-ID headers
531 # are only a single line. We can't subclass Email::Simple::Header
532 # and override _default_fold_at in here, either; since that won't
533 # affect messages already in the archive.
534 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
539 sub cmd_article ($;$) {
540 my ($self, $art) = @_;
541 my $r = art_lookup($self, $art, 1);
542 return $r unless ref $r;
543 my ($n, $mid, $s) = @$r;
544 set_art($self, $art);
545 more($self, "220 $n <$mid> article retrieved - head and body follow");
546 msg_more($self, _header($s));
547 msg_more($self, "\r\n");
548 simple_body_write($self, $s);
552 my ($self, $art) = @_;
553 my $r = art_lookup($self, $art, 2);
554 return $r unless ref $r;
555 my ($n, $mid, $s) = @$r;
556 set_art($self, $art);
557 more($self, "221 $n <$mid> article retrieved - head follows");
558 msg_more($self, _header($s));
563 my ($self, $art) = @_;
564 my $r = art_lookup($self, $art, 0);
565 return $r unless ref $r;
566 my ($n, $mid, $s) = @$r;
567 set_art($self, $art);
568 more($self, "222 $n <$mid> article retrieved - body follows");
569 simple_body_write($self, $s);
573 my ($self, $art) = @_;
574 my $r = art_lookup($self, $art, 0);
575 return $r unless ref $r;
576 my ($n, $mid, undef) = @$r;
577 set_art($self, $art);
578 "223 $n <$mid> article retrieved - request text separately";
581 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
583 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
587 more($self, '100 help text follows');
592 my ($self, $range) = @_;
593 my $ng = $self->{ng} or return '412 no news group has been selected';
594 defined $range or return '420 No article(s) selected';
596 my ($min, $max) = $ng->mm->minmax;
597 if ($range =~ /\A([0-9]+)\z/) {
599 } elsif ($range =~ /\A([0-9]+)-\z/) {
600 ($beg, $end) = ($1, $max);
601 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
602 ($beg, $end) = ($1, $2);
606 $beg = $min if ($beg < $min);
607 $end = $max if ($end > $max);
608 return '420 No article(s) selected' if ($beg > $end);
612 sub long_response ($$) {
613 my ($self, $cb) = @_; # cb returns true if more, false if done
615 my $fd = fileno($self->{sock});
616 defined $fd or return;
617 # make sure we disable reading during a long response,
618 # clients should not be sending us stuff and making us do more
619 # work while we are stream a response to them
621 my $long_cb; # DANGER: self-referential
623 # wbuf is unset or empty, here; $cb may add to it
624 my $more = eval { $cb->() };
625 if ($@ || !$self->{sock}) { # something bad happened...
627 my $diff = now() - $t0;
630 "%s during long response[$fd] - %0.6f",
633 out($self, " deferred[$fd] aborted - %0.6f", $diff);
635 } elsif ($more) { # $self->{wbuf}:
636 update_idle_time($self);
638 # no recursion, schedule another call ASAP
639 # but only after all pending writes are done
640 my $wbuf = $self->{wbuf} ||= [];
641 push @$wbuf, $long_cb;
643 # wbuf may be populated by $cb, no need to rearm if so:
644 $self->requeue if scalar(@$wbuf) == 1;
648 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
649 $self->requeue unless $self->{wbuf};
652 $self->write($long_cb); # kick off!
656 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
657 my ($self, $xhdr, $range) = @_;
659 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
660 my ($ng, $n) = mid_lookup($self, $1);
661 return r430 unless $n;
662 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
663 } else { # numeric range
664 $range = $self->{article} unless defined $range;
665 my $r = get_range($self, $range);
666 return $r unless ref $r;
667 my $mm = $self->{ng}->mm;
668 my ($beg, $end) = @$r;
669 more($self, $xhdr ? r221 : r225);
670 long_response($self, sub {
671 my $r = $mm->msg_range(\$beg, $end);
673 more($self, join("\r\n", map {
681 sub mid_lookup ($$) {
682 my ($self, $mid) = @_;
683 my $self_ng = $self->{ng};
685 my $n = $self_ng->mm->num_for($mid);
686 return ($self_ng, $n) if defined $n;
688 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
689 next if defined $self_ng && $ng eq $self_ng;
690 my $n = $ng->mm->num_for($mid);
691 return ($ng, $n) if defined $n;
696 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
697 my ($self, $xhdr, $range) = @_;
699 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
701 my ($ng, $n) = mid_lookup($self, $mid);
702 return r430 unless $n;
703 hdr_mid_response($self, $xhdr, $ng, $n, $range,
704 xref($self, $ng, $n, $mid));
705 } else { # numeric range
706 $range = $self->{article} unless defined $range;
707 my $r = get_range($self, $range);
708 return $r unless ref $r;
709 my $ng = $self->{ng};
711 my ($beg, $end) = @$r;
712 more($self, $xhdr ? r221 : r225);
713 long_response($self, sub {
714 my $r = $mm->msg_range(\$beg, $end);
716 more($self, join("\r\n", map {
718 "$num ".xref($self, $ng, $num, $_->[1]);
725 sub over_header_for {
726 my ($over, $num, $field) = @_;
727 my $smsg = $over->get_art($num) or return;
728 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
732 sub hdr_searchmsg ($$$$) {
733 my ($self, $xhdr, $field, $range) = @_;
734 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
735 my ($ng, $n) = mid_lookup($self, $1);
736 return r430 unless defined $n;
737 my $v = over_header_for($ng->over, $n, $field);
738 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
739 } else { # numeric range
740 $range = $self->{article} unless defined $range;
741 my $over = $self->{ng}->over;
742 my $mm = $self->{ng}->mm;
743 my $r = get_range($self, $range);
744 return $r unless ref $r;
745 my ($beg, $end) = @$r;
746 more($self, $xhdr ? r221 : r225);
748 long_response($self, sub {
749 my $msgs = $over->query_xover($cur, $end);
750 my $nr = scalar @$msgs or return;
752 foreach my $s (@$msgs) {
753 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
756 msg_more($self, $tmp);
757 $cur = $msgs->[-1]->{num} + 1;
763 my ($self, $xhdr, $header, $range) = @_;
764 my $sub = lc $header;
765 if ($sub eq 'message-id') {
766 hdr_message_id($self, $xhdr, $range);
767 } elsif ($sub eq 'xref') {
768 hdr_xref($self, $xhdr, $range);
769 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
771 hdr_searchmsg($self, $xhdr, $sub, $range);
772 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
773 hdr_searchmsg($self, $xhdr, $1, $range);
775 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
781 my ($self, $header, $range) = @_;
782 do_hdr($self, 0, $header, $range);
786 sub cmd_xhdr ($$;$) {
787 my ($self, $header, $range) = @_;
788 do_hdr($self, 1, $header, $range);
791 sub hdr_mid_prefix ($$$$$) {
792 my ($self, $xhdr, $ng, $n, $mid) = @_;
793 return $mid if $xhdr;
795 # HDR for RFC 3977 users
796 if (my $self_ng = $self->{ng}) {
797 ($self_ng eq $ng) ? $n : '0';
803 sub hdr_mid_response ($$$$$$) {
804 my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result
807 $res .= r221 . "\r\n";
808 $res .= "$mid $v\r\n";
810 $res .= r225 . "\r\n";
811 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
812 $res .= "$pfx $v\r\n";
814 res($self, $res .= '.');
818 sub cmd_xrover ($;$) {
819 my ($self, $range) = @_;
820 my $ng = $self->{ng} or return '412 no newsgroup selected';
821 (defined $range && $range =~ /[<>]/) and
822 return '420 No article(s) selected'; # no message IDs
824 $range = $self->{article} unless defined $range;
825 my $r = get_range($self, $range);
826 return $r unless ref $r;
827 my ($beg, $end) = @$r;
829 my $over = $ng->over;
830 more($self, '224 Overview information follows');
832 long_response($self, sub {
833 my $h = over_header_for($over, $beg, 'references');
834 more($self, "$beg $h") if defined($h);
839 sub over_line ($$$$) {
840 my ($self, $ng, $num, $smsg) = @_;
841 # n.b. field access and procedural calls can be
842 # 10%-15% faster than OO method calls:
843 my $s = join("\t", $num,
846 PublicInbox::SearchMsg::date($smsg),
851 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
857 my ($self, $range) = @_;
858 if ($range && $range =~ /\A<(.+)>\z/) {
859 my ($ng, $n) = mid_lookup($self, $1);
860 defined $n or return r430;
861 my $smsg = $ng->over->get_art($n) or return r430;
862 more($self, '224 Overview information follows (multi-line)');
864 # Only set article number column if it's the current group
865 my $self_ng = $self->{ng};
866 $n = 0 if (!$self_ng || $self_ng ne $ng);
867 more($self, over_line($self, $ng, $n, $smsg));
870 cmd_xover($self, $range);
874 sub cmd_xover ($;$) {
875 my ($self, $range) = @_;
876 $range = $self->{article} unless defined $range;
877 my $r = get_range($self, $range);
878 return $r unless ref $r;
879 my ($beg, $end) = @$r;
880 more($self, "224 Overview information follows for $beg to $end");
881 my $over = $self->{ng}->over;
883 long_response($self, sub {
884 my $msgs = $over->query_xover($cur, $end);
885 my $nr = scalar @$msgs or return;
888 more($self, join("\r\n", map {
889 over_line($self, $self->{ng}, $_->{num}, $_);
891 $cur = $msgs->[-1]->{num} + 1;
895 sub cmd_starttls ($) {
897 my $sock = $self->{sock} or return;
899 (ref($sock) eq 'IO::Socket::SSL') and return '502 Command unavailable';
900 my $opt = $self->{nntpd}->{accept_tls} or
901 return '580 can not initiate TLS negotiation';
902 res($self, '382 Continue with TLS negotiation');
903 $self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt);
904 $self->requeue if PublicInbox::DS::accept_tls_step($self);
909 my ($self, $mid) = @_;
910 return r501 unless $mid =~ /\A<(.+)>\z/;
913 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
914 my $n = $ng->mm->num_for($mid);
915 push @paths, "$ng->{newsgroup}/$n" if defined $n;
917 return '430 no such article on server' unless @paths;
918 '223 '.join(' ', @paths);
921 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
923 sub more ($$) { msg_more($_[0], $_[1] . "\r\n") }
927 my $done = $self->write(\($_[1]));
928 return 0 unless $self->{sock};
934 my ($self, $fmt, @args) = @_;
935 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
939 my ($self, $fmt, @args) = @_;
940 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
943 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
947 return unless $self->flush_write && $self->{sock};
949 update_idle_time($self);
950 # only read more requests if we've drained the write buffer,
951 # otherwise we can be buffering infinitely w/o backpressure
953 use constant LINE_MAX => 512; # RFC 977 section 2.3
954 my $rbuf = $self->{rbuf} // (\(my $x = ''));
957 if (index($$rbuf, "\n") < 0) {
958 my $off = bytes::length($$rbuf);
959 $r = $self->do_read($rbuf, LINE_MAX, $off) or return;
961 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
963 return $self->close if $line =~ /[[:cntrl:]]/s;
965 my $fd = fileno($self->{sock});
966 $r = eval { process_line($self, $line) };
967 my $pending = $self->{wbuf} ? ' pending' : '';
968 out($self, "[$fd] %s - %0.6f$pending", $line, now() - $t0);
971 return $self->close if $r < 0;
972 my $len = bytes::length($$rbuf);
973 return $self->close if ($len >= LINE_MAX);
974 $self->rbuf_idle($rbuf);
975 update_idle_time($self);
977 # maybe there's more pipelined data, or we'll have
978 # to register it for socket-readiness notifications
979 $self->requeue unless $self->{wbuf};
982 sub not_idle_long ($$) {
983 my ($self, $now) = @_;
984 my $sock = $self->{sock} or return;
985 my $ary = $EXPMAP->{fileno($sock)} or return;
986 my $exp_at = $ary->[0] + $EXPTIME;
990 # for graceful shutdown in PublicInbox::Daemon:
992 my ($self, $now) = @_;
993 ($self->{rbuf} || $self->{wbuf} || not_idle_long($self, $now));