1 # Copyright (C) 2015-2018 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 rbuf ng long_res);
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(EPOLLOUT 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
48 foreach my $nntp (@$q) {
49 # for request && response protocols, always finish writing
50 # before finishing reading:
51 if (my $long_cb = $nntp->{long_res}) {
52 $nntp->write($long_cb);
54 # pipelined request, we bypassed socket-readiness
63 $nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
66 sub update_idle_time ($) {
68 my $sock = $self->{sock} or return;
69 $EXPMAP->{fileno($sock)} = [ now(), $self ];
75 my $old = $now - $exp;
78 while (my ($fd, $v) = each %$EXPMAP) {
79 my ($idle_time, $nntp) = @$v;
80 if ($idle_time < $old) {
81 $nntp->close; # idempotent
89 $expt = PublicInbox::EvCleanup::later(*expire_old);
92 # noop to kick outselves out of the loop ASAP so descriptors
94 PublicInbox::EvCleanup::asap(sub {});
99 my ($class, $sock, $nntpd) = @_;
100 my $self = fields::new($class);
101 $self->SUPER::new($sock, EPOLLOUT | EPOLLONESHOT);
102 $self->{nntpd} = $nntpd;
103 my $greet = "201 $nntpd->{servername} ready - post via email\r\n";
104 open my $fh, '<:scalar', \$greet or die "open :scalar: $!";
105 $self->{wbuf} = [ $fh ];
107 update_idle_time($self);
108 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
113 my ($cb, $argc) = @_;
114 my $tot = prototype $cb;
115 my ($nreq, undef) = split(';', $tot);
116 $nreq = ($nreq =~ tr/$//) - 1;
117 $tot = ($tot =~ tr/$//) - 1;
118 ($argc <= $tot && $argc >= $nreq);
121 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
122 sub process_line ($$) {
124 my ($req, @args) = split(/[ \t]/, $l);
125 return 1 unless defined($req); # skip blank line
129 $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
131 return res($self, '500 command not recognized') unless $req;
132 return res($self, r501) unless args_ok($req, scalar @args);
134 my $res = eval { $req->($self, @args) };
136 if ($err && $self->{sock}) {
139 err($self, 'error from: %s (%s)', $l, $err);
140 $res = '503 program fault - command not performed';
142 return 0 unless defined $res;
147 my ($self, $arg) = @_;
149 return r501 unless $arg eq 'READER';
150 '201 Posting prohibited';
153 sub cmd_slave ($) { '202 slave status noted' }
155 sub cmd_xgtitle ($;$) {
156 my ($self, $wildmat) = @_;
157 more($self, '282 list of groups and descriptions follows');
158 list_newsgroups($self, $wildmat);
162 sub list_overview_fmt ($) {
164 msg_more($self, $OVERVIEW_FMT);
167 sub list_headers ($;$) {
169 msg_more($self, $LIST_HEADERS);
172 sub list_active ($;$) {
173 my ($self, $wildmat) = @_;
174 wildmat2re($wildmat);
175 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
176 $ng->{newsgroup} =~ $wildmat or next;
177 group_line($self, $ng);
181 sub list_active_times ($;$) {
182 my ($self, $wildmat) = @_;
183 wildmat2re($wildmat);
184 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
185 $ng->{newsgroup} =~ $wildmat or next;
186 my $c = eval { $ng->mm->created_at } || time;
187 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
191 sub list_newsgroups ($;$) {
192 my ($self, $wildmat) = @_;
193 wildmat2re($wildmat);
194 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
195 $ng->{newsgroup} =~ $wildmat or next;
196 my $d = $ng->description;
197 more($self, "$ng->{newsgroup} $d");
201 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
202 sub cmd_list ($;$$) {
203 my ($self, @args) = @_;
205 my $arg = shift @args;
206 $arg =~ tr/A-Z./a-z_/;
208 return r501 if $DISABLED{$arg};
214 return r501 unless $arg && args_ok($arg, scalar @args);
215 more($self, '215 information follows');
216 $arg->($self, @args);
218 more($self, '215 list of newsgroups follows');
219 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
220 group_line($self, $ng);
226 sub cmd_listgroup ($;$) {
227 my ($self, $group) = @_;
228 if (defined $group) {
229 my $res = cmd_group($self, $group);
230 return $res if ($res !~ /\A211 /);
234 $self->{ng} or return '412 no newsgroup selected';
236 long_response($self, sub {
237 my $ary = $self->{ng}->mm->ids_after(\$n);
238 scalar @$ary or return;
239 more($self, join("\r\n", @$ary));
244 sub parse_time ($$;$) {
245 my ($date, $time, $gmt) = @_;
246 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
248 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
251 my @now = $gmt ? gmtime : localtime;
252 my ($YYYY, $MM, $DD);
253 if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD
254 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
255 } else { # legacy clients send YYMMDD
256 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
257 my $cur_year = $now[5] + 1900;
258 if ($YYYY > $cur_year) {
259 $YYYY += int($cur_year / 1000) * 1000 - 100;
263 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
265 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
269 sub group_line ($$) {
270 my ($self, $ng) = @_;
271 my ($min, $max) = $ng->mm->minmax;
272 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
275 sub cmd_newgroups ($$$;$$) {
276 my ($self, $date, $time, $gmt, $dists) = @_;
277 my $ts = eval { parse_time($date, $time, $gmt) };
281 more($self, '231 list of new newsgroups follows');
282 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
283 my $c = eval { $ng->mm->created_at } || 0;
284 next unless $c > $ts;
285 group_line($self, $ng);
290 sub wildmat2re (;$) {
291 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
296 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
298 my $key = sha1_hex($orig . $salt);
299 $orig =~ s/([^\w\-])+/\Q$1/g;
303 my %map = ('*' => '.*', '?' => '.' );
304 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
306 $tmp =~ s#([a-f0-9]{40})#
307 my $orig = $keep{$1};
308 defined $orig ? $orig : $1;
311 $_[0] = qr/\A$tmp\z/;
315 return $_[0] = qr/\A\z/ unless defined $_[0];
316 my %map = ('*' => '.*', ',' => '|');
317 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
318 $_[0] = qr/\A(?:$_[0])\z/;
321 sub cmd_newnews ($$$$;$$) {
322 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
323 my $ts = eval { parse_time($date, $time, $gmt) };
325 more($self, '230 list of new articles by message-id follows');
326 my ($keep, $skip) = split('!', $newsgroups, 2);
330 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
331 $ng->{newsgroup} =~ $keep or next;
332 $ng->{newsgroup} =~ $skip and next;
333 my $over = $ng->over or next;
336 return '.' unless @over;
339 long_response($self, sub {
341 my $msgs = $over->query_ts($ts, $prev);
344 join(">\r\n<", map { $_->mid } @$msgs ).
346 $prev = $msgs->[-1]->{num};
349 if (@over) { # continue onto next newsgroup
352 } else { # break out of the long response.
360 my ($self, $group) = @_;
361 my $no_such = '411 no such news group';
362 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
365 my ($min, $max) = $ng->mm->minmax;
368 $self->{article} = $min;
369 my $est_size = $max - $min;
370 "211 $est_size $min $max $group";
373 sub article_adj ($$) {
374 my ($self, $off) = @_;
375 my $ng = $self->{ng} or return '412 no newsgroup selected';
377 my $n = $self->{article};
378 defined $n or return '420 no current article has been selected';
381 my $mid = $ng->mm->mid_for($n);
383 $n = $off > 0 ? 'next' : 'previous';
384 return "421 no $n article in this group";
386 $self->{article} = $n;
387 "223 $n <$mid> article retrieved - request text separately";
390 sub cmd_next ($) { article_adj($_[0], 1) }
391 sub cmd_last ($) { article_adj($_[0], -1) }
393 # We want to encourage using email and CC-ing everybody involved to avoid
394 # the single-point-of-failure a single server provides.
397 my $ng = $self->{ng};
398 $ng ? "440 mailto:$ng->{-primary_address} to post"
399 : '440 posting not allowed'
404 res($self, '205 closing connection - goodbye!');
409 sub header_append ($$$) {
410 my ($hdr, $k, $v) = @_;
411 my @v = $hdr->header($k);
415 $hdr->header_set($k, @v, $v);
419 my ($self, $ng, $n, $mid) = @_;
420 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
422 # num_for is pretty cheap and sometimes we'll lookup the existence
423 # of an article without getting even the OVER info. In other words,
424 # I'm not sure if its worth optimizing by scanning To:/Cc: and
425 # PublicInbox::ExtMsg on the PSGI end is just as expensive
426 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
427 next if $ng eq $other;
428 my $num = eval { $other->mm->num_for($mid) } or next;
429 $ret .= " $other->{newsgroup}:$num";
434 sub set_nntp_headers ($$$$$) {
435 my ($self, $hdr, $ng, $n, $mid) = @_;
437 # why? leafnode requires a Path: header for some inexplicable
438 # reason. We'll fake the shortest one possible.
439 $hdr->header_set('Path', 'y');
441 # leafnode (and maybe other NNTP clients) have trouble dealing
442 # with v2 messages which have multiple Message-IDs (either due
443 # to our own content-based dedupe or buggy git-send-email versions).
444 my @mids = $hdr->header('Message-ID');
445 if (scalar(@mids) > 1) {
447 $hdr->header_set('Message-ID', $mid0);
448 my @alt = $hdr->header('X-Alt-Message-ID');
449 my %seen = map { $_ => 1 } (@alt, $mid0);
450 foreach my $m (@mids) {
454 $hdr->header_set('X-Alt-Message-ID', @alt);
458 my $xref = xref($self, $ng, $n, $mid);
459 $hdr->header_set('Xref', $xref);
460 $xref =~ s/:[0-9]+//g;
461 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
462 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
463 if (my $url = $ng->base_url) {
464 $mid = mid_escape($mid);
465 header_append($hdr, 'Archived-At', "<$url$mid/>");
466 header_append($hdr, 'List-Archive', "<$url>");
470 sub art_lookup ($$$) {
471 my ($self, $art, $set_headers) = @_;
472 my $ng = $self->{ng};
476 if ($art =~ /\A[0-9]+\z/) {
477 $err = '423 no such article number in this group';
480 } elsif ($art =~ /\A<([^>]+)>\z/) {
483 $n = $ng->mm->num_for($mid) if $ng;
484 goto found if defined $n;
485 foreach my $g (values %{$self->{nntpd}->{groups}}) {
486 $n = $g->mm->num_for($mid);
497 $err = '420 no current article has been selected';
498 $n = $self->{article};
499 defined $n or return $err;
501 $ng or return '412 no newsgroup has been selected';
502 $mid = $ng->mm->mid_for($n);
503 defined $mid or return $err;
506 my $smsg = $ng->over->get_art($n) or return $err;
507 my $msg = $ng->msg_by_smsg($smsg) or return $err;
508 my $s = Email::Simple->new($msg);
510 set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
513 $s->body_set('') if ($set_headers == 2);
515 [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
518 sub simple_body_write ($$) {
522 $body =~ s/^\./../smg;
523 $body =~ s/(?<!\r)\n/\r\n/sg;
524 msg_more($self, $body);
525 msg_more($self, "\r\n") unless $body =~ /\r\n\z/s;
530 my ($self, $art) = @_;
531 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
535 my $hdr = $_[0]->header_obj->as_string;
537 $hdr =~ s/(?<!\r)\n/\r\n/sg;
539 # for leafnode compatibility, we need to ensure Message-ID headers
540 # are only a single line. We can't subclass Email::Simple::Header
541 # and override _default_fold_at in here, either; since that won't
542 # affect messages already in the archive.
543 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
548 sub cmd_article ($;$) {
549 my ($self, $art) = @_;
550 my $r = art_lookup($self, $art, 1);
551 return $r unless ref $r;
552 my ($n, $mid, $s) = @$r;
553 set_art($self, $art);
554 more($self, "220 $n <$mid> article retrieved - head and body follow");
555 msg_more($self, _header($s));
556 msg_more($self, "\r\n");
557 simple_body_write($self, $s);
561 my ($self, $art) = @_;
562 my $r = art_lookup($self, $art, 2);
563 return $r unless ref $r;
564 my ($n, $mid, $s) = @$r;
565 set_art($self, $art);
566 more($self, "221 $n <$mid> article retrieved - head follows");
567 msg_more($self, _header($s));
572 my ($self, $art) = @_;
573 my $r = art_lookup($self, $art, 0);
574 return $r unless ref $r;
575 my ($n, $mid, $s) = @$r;
576 set_art($self, $art);
577 more($self, "222 $n <$mid> article retrieved - body follows");
578 simple_body_write($self, $s);
582 my ($self, $art) = @_;
583 my $r = art_lookup($self, $art, 0);
584 return $r unless ref $r;
585 my ($n, $mid, undef) = @$r;
586 set_art($self, $art);
587 "223 $n <$mid> article retrieved - request text separately";
590 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
592 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
596 more($self, '100 help text follows');
601 my ($self, $range) = @_;
602 my $ng = $self->{ng} or return '412 no news group has been selected';
603 defined $range or return '420 No article(s) selected';
605 my ($min, $max) = $ng->mm->minmax;
606 if ($range =~ /\A([0-9]+)\z/) {
608 } elsif ($range =~ /\A([0-9]+)-\z/) {
609 ($beg, $end) = ($1, $max);
610 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
611 ($beg, $end) = ($1, $2);
615 $beg = $min if ($beg < $min);
616 $end = $max if ($end > $max);
617 return '420 No article(s) selected' if ($beg > $end);
621 sub long_response ($$) {
622 my ($self, $cb) = @_;
623 die "BUG: nested long response" if $self->{long_res};
625 my $fd = fileno($self->{sock});
626 defined $fd or return;
627 # make sure we disable reading during a long response,
628 # clients should not be sending us stuff and making us do more
629 # work while we are stream a response to them
631 $self->{long_res} = sub {
632 my $more = eval { $cb->() };
633 if ($@ || !$self->{sock}) { # something bad happened...
634 delete $self->{long_res};
638 "%s during long response[$fd] - %0.6f",
642 update_idle_time($self);
645 out($self, " deferred[$fd] aborted - %0.6f",
648 } elsif ($more) { # $self->{wbuf}:
649 # no recursion, schedule another call ASAP
650 # but only after all pending writes are done
651 update_idle_time($self);
654 delete $self->{long_res};
656 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
660 $self->{long_res}->(); # kick off!
664 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
665 my ($self, $xhdr, $range) = @_;
667 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
668 my ($ng, $n) = mid_lookup($self, $1);
669 return r430 unless $n;
670 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
671 } else { # numeric range
672 $range = $self->{article} unless defined $range;
673 my $r = get_range($self, $range);
674 return $r unless ref $r;
675 my $mm = $self->{ng}->mm;
676 my ($beg, $end) = @$r;
677 more($self, $xhdr ? r221 : r225);
678 long_response($self, sub {
679 my $r = $mm->msg_range(\$beg, $end);
681 more($self, join("\r\n", map {
689 sub mid_lookup ($$) {
690 my ($self, $mid) = @_;
691 my $self_ng = $self->{ng};
693 my $n = $self_ng->mm->num_for($mid);
694 return ($self_ng, $n) if defined $n;
696 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
697 next if defined $self_ng && $ng eq $self_ng;
698 my $n = $ng->mm->num_for($mid);
699 return ($ng, $n) if defined $n;
704 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
705 my ($self, $xhdr, $range) = @_;
707 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
709 my ($ng, $n) = mid_lookup($self, $mid);
710 return r430 unless $n;
711 hdr_mid_response($self, $xhdr, $ng, $n, $range,
712 xref($self, $ng, $n, $mid));
713 } else { # numeric range
714 $range = $self->{article} unless defined $range;
715 my $r = get_range($self, $range);
716 return $r unless ref $r;
717 my $ng = $self->{ng};
719 my ($beg, $end) = @$r;
720 more($self, $xhdr ? r221 : r225);
721 long_response($self, sub {
722 my $r = $mm->msg_range(\$beg, $end);
724 more($self, join("\r\n", map {
726 "$num ".xref($self, $ng, $num, $_->[1]);
733 sub over_header_for {
734 my ($over, $num, $field) = @_;
735 my $smsg = $over->get_art($num) or return;
736 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
740 sub hdr_searchmsg ($$$$) {
741 my ($self, $xhdr, $field, $range) = @_;
742 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
743 my ($ng, $n) = mid_lookup($self, $1);
744 return r430 unless defined $n;
745 my $v = over_header_for($ng->over, $n, $field);
746 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
747 } else { # numeric range
748 $range = $self->{article} unless defined $range;
749 my $over = $self->{ng}->over;
750 my $mm = $self->{ng}->mm;
751 my $r = get_range($self, $range);
752 return $r unless ref $r;
753 my ($beg, $end) = @$r;
754 more($self, $xhdr ? r221 : r225);
756 long_response($self, sub {
757 my $msgs = $over->query_xover($cur, $end);
758 my $nr = scalar @$msgs or return;
760 foreach my $s (@$msgs) {
761 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
764 msg_more($self, $tmp);
765 $cur = $msgs->[-1]->{num} + 1;
771 my ($self, $xhdr, $header, $range) = @_;
772 my $sub = lc $header;
773 if ($sub eq 'message-id') {
774 hdr_message_id($self, $xhdr, $range);
775 } elsif ($sub eq 'xref') {
776 hdr_xref($self, $xhdr, $range);
777 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
779 hdr_searchmsg($self, $xhdr, $sub, $range);
780 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
781 hdr_searchmsg($self, $xhdr, $1, $range);
783 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
789 my ($self, $header, $range) = @_;
790 do_hdr($self, 0, $header, $range);
794 sub cmd_xhdr ($$;$) {
795 my ($self, $header, $range) = @_;
796 do_hdr($self, 1, $header, $range);
799 sub hdr_mid_prefix ($$$$$) {
800 my ($self, $xhdr, $ng, $n, $mid) = @_;
801 return $mid if $xhdr;
803 # HDR for RFC 3977 users
804 if (my $self_ng = $self->{ng}) {
805 ($self_ng eq $ng) ? $n : '0';
811 sub hdr_mid_response ($$$$$$) {
812 my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result
815 $res .= r221 . "\r\n";
816 $res .= "$mid $v\r\n";
818 $res .= r225 . "\r\n";
819 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
820 $res .= "$pfx $v\r\n";
822 res($self, $res .= '.');
826 sub cmd_xrover ($;$) {
827 my ($self, $range) = @_;
828 my $ng = $self->{ng} or return '412 no newsgroup selected';
829 (defined $range && $range =~ /[<>]/) and
830 return '420 No article(s) selected'; # no message IDs
832 $range = $self->{article} unless defined $range;
833 my $r = get_range($self, $range);
834 return $r unless ref $r;
835 my ($beg, $end) = @$r;
837 my $over = $ng->over;
838 more($self, '224 Overview information follows');
840 long_response($self, sub {
841 my $h = over_header_for($over, $beg, 'references');
842 more($self, "$beg $h") if defined($h);
847 sub over_line ($$$$) {
848 my ($self, $ng, $num, $smsg) = @_;
849 # n.b. field access and procedural calls can be
850 # 10%-15% faster than OO method calls:
851 my $s = join("\t", $num,
854 PublicInbox::SearchMsg::date($smsg),
859 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
865 my ($self, $range) = @_;
866 if ($range && $range =~ /\A<(.+)>\z/) {
867 my ($ng, $n) = mid_lookup($self, $1);
868 defined $n or return r430;
869 my $smsg = $ng->over->get_art($n) or return r430;
870 more($self, '224 Overview information follows (multi-line)');
872 # Only set article number column if it's the current group
873 my $self_ng = $self->{ng};
874 $n = 0 if (!$self_ng || $self_ng ne $ng);
875 more($self, over_line($self, $ng, $n, $smsg));
878 cmd_xover($self, $range);
882 sub cmd_xover ($;$) {
883 my ($self, $range) = @_;
884 $range = $self->{article} unless defined $range;
885 my $r = get_range($self, $range);
886 return $r unless ref $r;
887 my ($beg, $end) = @$r;
888 more($self, "224 Overview information follows for $beg to $end");
889 my $over = $self->{ng}->over;
891 long_response($self, sub {
892 my $msgs = $over->query_xover($cur, $end);
893 my $nr = scalar @$msgs or return;
896 more($self, join("\r\n", map {
897 over_line($self, $self->{ng}, $_->{num}, $_);
899 $cur = $msgs->[-1]->{num} + 1;
904 my ($self, $mid) = @_;
905 return r501 unless $mid =~ /\A<(.+)>\z/;
908 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
909 my $n = $ng->mm->num_for($mid);
910 push @paths, "$ng->{newsgroup}/$n" if defined $n;
912 return '430 no such article on server' unless @paths;
913 '223 '.join(' ', @paths);
916 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
918 sub more ($$) { msg_more($_[0], $_[1] . "\r\n") }
922 my $done = $self->write(\($_[1]));
923 return 0 unless $self->{sock};
929 my ($self, $fmt, @args) = @_;
930 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
934 my ($self, $fmt, @args) = @_;
935 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
938 # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err)
942 return unless $self->flush_write && $self->{sock};
944 update_idle_time($self);
945 # only read more requests if we've drained the write buffer,
946 # otherwise we can be buffering infinitely w/o backpressure
948 use constant LINE_MAX => 512; # RFC 977 section 2.3
949 my $rbuf = \($self->{rbuf});
952 if (index($$rbuf, "\n") < 0) {
953 my $off = bytes::length($$rbuf);
954 $r = $self->do_read($rbuf, LINE_MAX, $off) or return;
956 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
958 return $self->close if $line =~ /[[:cntrl:]]/s;
960 my $fd = fileno($self->{sock});
961 $r = eval { process_line($self, $line) };
962 my $d = $self->{long_res} ?
963 " deferred[$fd]" : '';
964 out($self, "[$fd] %s - %0.6f$d", $line, now() - $t0);
967 return $self->close if $r < 0;
968 my $len = bytes::length($$rbuf);
969 return $self->close if ($len >= LINE_MAX);
970 update_idle_time($self);
972 # maybe there's more pipelined data, or we'll have
973 # to register it for socket-readiness notifications
974 requeue($self) unless ($self->{long_res} || $self->{wbuf});
977 sub not_idle_long ($$) {
978 my ($self, $now) = @_;
979 my $sock = $self->{sock} or return;
980 my $ary = $EXPMAP->{fileno($sock)} or return;
981 my $exp_at = $ary->[0] + $EXPTIME;
985 # for graceful shutdown in PublicInbox::Daemon:
987 my ($self, $now) = @_;
988 ($self->{rbuf} ne '' || $self->{long_res} ||
989 $self->{wbuf} || not_idle_long($self, $now));