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',
28 my @OVERVIEW = qw(Subject From Date Message-ID References Xref);
29 my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines)) . ":\r\n";
30 my $LIST_HEADERS = join("\r\n", @OVERVIEW,
31 qw(:bytes :lines Xref To Cc)) . "\r\n";
33 # disable commands with easy DoS potential:
34 my %DISABLED; # = map { $_ => 1 } qw(xover list_overview_fmt newnews xhdr);
36 my $EXPMAP; # fd -> [ idle_time, $self ]
38 our $EXPTIME = 180; # 3 minutes
46 foreach my $nntp (@$q) {
47 # for request && response protocols, always finish writing
48 # before finishing reading:
49 if (my $long_cb = $nntp->{long_res}) {
50 $nntp->write($long_cb);
52 # pipelined request, we bypassed socket-readiness
56 # maybe there's more pipelined data, or we'll have
57 # to register it for socket-readiness notifications
58 if (!$nntp->{long_res} && $nntp->{sock}) {
65 sub update_idle_time ($) {
67 my $sock = $self->{sock} or return;
68 $EXPMAP->{fileno($sock)} = [ now(), $self ];
74 my $old = $now - $exp;
77 while (my ($fd, $v) = each %$EXPMAP) {
78 my ($idle_time, $nntp) = @$v;
79 if ($idle_time < $old) {
80 $nntp->close; # idempotent
88 $expt = PublicInbox::EvCleanup::later(*expire_old);
91 # noop to kick outselves out of the loop ASAP so descriptors
93 PublicInbox::EvCleanup::asap(sub {});
98 my ($class, $sock, $nntpd) = @_;
99 my $self = fields::new($class);
100 $self->SUPER::new($sock, PublicInbox::DS::EPOLLIN());
101 $self->{nntpd} = $nntpd;
102 res($self, '201 ' . $nntpd->{servername} . ' ready - post via email');
104 update_idle_time($self);
105 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
110 my ($cb, $argc) = @_;
111 my $tot = prototype $cb;
112 my ($nreq, undef) = split(';', $tot);
113 $nreq = ($nreq =~ tr/$//) - 1;
114 $tot = ($tot =~ tr/$//) - 1;
115 ($argc <= $tot && $argc >= $nreq);
118 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
119 sub process_line ($$) {
121 my ($req, @args) = split(/[ \t]/, $l);
122 return 1 unless defined($req); # skip blank line
126 $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
128 return res($self, '500 command not recognized') unless $req;
129 return res($self, r501) unless args_ok($req, scalar @args);
131 my $res = eval { $req->($self, @args) };
133 if ($err && $self->{sock}) {
136 err($self, 'error from: %s (%s)', $l, $err);
137 $res = '503 program fault - command not performed';
139 return 0 unless defined $res;
144 my ($self, $arg) = @_;
146 return r501 unless $arg eq 'READER';
147 '201 Posting prohibited';
150 sub cmd_slave ($) { '202 slave status noted' }
152 sub cmd_xgtitle ($;$) {
153 my ($self, $wildmat) = @_;
154 more($self, '282 list of groups and descriptions follows');
155 list_newsgroups($self, $wildmat);
159 sub list_overview_fmt ($) {
161 msg_more($self, $OVERVIEW_FMT);
164 sub list_headers ($;$) {
166 msg_more($self, $LIST_HEADERS);
169 sub list_active ($;$) {
170 my ($self, $wildmat) = @_;
171 wildmat2re($wildmat);
172 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
173 $ng->{newsgroup} =~ $wildmat or next;
174 group_line($self, $ng);
178 sub list_active_times ($;$) {
179 my ($self, $wildmat) = @_;
180 wildmat2re($wildmat);
181 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
182 $ng->{newsgroup} =~ $wildmat or next;
183 my $c = eval { $ng->mm->created_at } || time;
184 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
188 sub list_newsgroups ($;$) {
189 my ($self, $wildmat) = @_;
190 wildmat2re($wildmat);
191 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
192 $ng->{newsgroup} =~ $wildmat or next;
193 my $d = $ng->description;
194 more($self, "$ng->{newsgroup} $d");
198 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
199 sub cmd_list ($;$$) {
200 my ($self, @args) = @_;
202 my $arg = shift @args;
203 $arg =~ tr/A-Z./a-z_/;
205 return r501 if $DISABLED{$arg};
211 return r501 unless $arg && args_ok($arg, scalar @args);
212 more($self, '215 information follows');
213 $arg->($self, @args);
215 more($self, '215 list of newsgroups follows');
216 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
217 group_line($self, $ng);
223 sub cmd_listgroup ($;$) {
224 my ($self, $group) = @_;
225 if (defined $group) {
226 my $res = cmd_group($self, $group);
227 return $res if ($res !~ /\A211 /);
231 $self->{ng} or return '412 no newsgroup selected';
233 long_response($self, sub {
234 my $ary = $self->{ng}->mm->ids_after(\$n);
235 scalar @$ary or return;
236 more($self, join("\r\n", @$ary));
241 sub parse_time ($$;$) {
242 my ($date, $time, $gmt) = @_;
243 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
245 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
248 my @now = $gmt ? gmtime : localtime;
249 my ($YYYY, $MM, $DD);
250 if (length($date) == 8) { # RFC 3977 allows YYYYMMDD
251 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
252 } else { # legacy clients send YYMMDD
253 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
254 my $cur_year = $now[5] + 1900;
255 if ($YYYY > $cur_year) {
256 $YYYY += int($cur_year / 1000) * 1000 - 100;
260 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
262 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
266 sub group_line ($$) {
267 my ($self, $ng) = @_;
268 my ($min, $max) = $ng->mm->minmax;
269 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
272 sub cmd_newgroups ($$$;$$) {
273 my ($self, $date, $time, $gmt, $dists) = @_;
274 my $ts = eval { parse_time($date, $time, $gmt) };
278 more($self, '231 list of new newsgroups follows');
279 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
280 my $c = eval { $ng->mm->created_at } || 0;
281 next unless $c > $ts;
282 group_line($self, $ng);
287 sub wildmat2re (;$) {
288 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
293 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
295 my $key = sha1_hex($orig . $salt);
296 $orig =~ s/([^\w\-])+/\Q$1/g;
300 my %map = ('*' => '.*', '?' => '.' );
301 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
303 $tmp =~ s#([a-f0-9]{40})#
304 my $orig = $keep{$1};
305 defined $orig ? $orig : $1;
308 $_[0] = qr/\A$tmp\z/;
312 return $_[0] = qr/\A\z/ unless defined $_[0];
313 my %map = ('*' => '.*', ',' => '|');
314 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
315 $_[0] = qr/\A(?:$_[0])\z/;
318 sub cmd_newnews ($$$$;$$) {
319 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
320 my $ts = eval { parse_time($date, $time, $gmt) };
322 more($self, '230 list of new articles by message-id follows');
323 my ($keep, $skip) = split('!', $newsgroups, 2);
327 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
328 $ng->{newsgroup} =~ $keep or next;
329 $ng->{newsgroup} =~ $skip and next;
330 my $over = $ng->over or next;
333 return '.' unless @over;
336 long_response($self, sub {
338 my $msgs = $over->query_ts($ts, $prev);
341 join(">\r\n<", map { $_->mid } @$msgs ).
343 $prev = $msgs->[-1]->{num};
346 if (@over) { # continue onto next newsgroup
349 } else { # break out of the long response.
357 my ($self, $group) = @_;
358 my $no_such = '411 no such news group';
359 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
362 my ($min, $max) = $ng->mm->minmax;
365 $self->{article} = $min;
366 my $est_size = $max - $min;
367 "211 $est_size $min $max $group";
370 sub article_adj ($$) {
371 my ($self, $off) = @_;
372 my $ng = $self->{ng} or return '412 no newsgroup selected';
374 my $n = $self->{article};
375 defined $n or return '420 no current article has been selected';
378 my $mid = $ng->mm->mid_for($n);
380 $n = $off > 0 ? 'next' : 'previous';
381 return "421 no $n article in this group";
383 $self->{article} = $n;
384 "223 $n <$mid> article retrieved - request text separately";
387 sub cmd_next ($) { article_adj($_[0], 1) }
388 sub cmd_last ($) { article_adj($_[0], -1) }
390 # We want to encourage using email and CC-ing everybody involved to avoid
391 # the single-point-of-failure a single server provides.
394 my $ng = $self->{ng};
395 $ng ? "440 mailto:$ng->{-primary_address} to post"
396 : '440 posting not allowed'
401 res($self, '205 closing connection - goodbye!');
406 sub header_append ($$$) {
407 my ($hdr, $k, $v) = @_;
408 my @v = $hdr->header($k);
412 $hdr->header_set($k, @v, $v);
416 my ($self, $ng, $n, $mid) = @_;
417 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
419 # num_for is pretty cheap and sometimes we'll lookup the existence
420 # of an article without getting even the OVER info. In other words,
421 # I'm not sure if its worth optimizing by scanning To:/Cc: and
422 # PublicInbox::ExtMsg on the PSGI end is just as expensive
423 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
424 next if $ng eq $other;
425 my $num = eval { $other->mm->num_for($mid) } or next;
426 $ret .= " $other->{newsgroup}:$num";
431 sub set_nntp_headers ($$$$$) {
432 my ($self, $hdr, $ng, $n, $mid) = @_;
434 # why? leafnode requires a Path: header for some inexplicable
435 # reason. We'll fake the shortest one possible.
436 $hdr->header_set('Path', 'y');
438 # leafnode (and maybe other NNTP clients) have trouble dealing
439 # with v2 messages which have multiple Message-IDs (either due
440 # to our own content-based dedupe or buggy git-send-email versions).
441 my @mids = $hdr->header('Message-ID');
442 if (scalar(@mids) > 1) {
444 $hdr->header_set('Message-ID', $mid0);
445 my @alt = $hdr->header('X-Alt-Message-ID');
446 my %seen = map { $_ => 1 } (@alt, $mid0);
447 foreach my $m (@mids) {
451 $hdr->header_set('X-Alt-Message-ID', @alt);
455 my $xref = xref($self, $ng, $n, $mid);
456 $hdr->header_set('Xref', $xref);
457 $xref =~ s/:[0-9]+//g;
458 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
459 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
460 if (my $url = $ng->base_url) {
461 $mid = mid_escape($mid);
462 header_append($hdr, 'Archived-At', "<$url$mid/>");
463 header_append($hdr, 'List-Archive', "<$url>");
467 sub art_lookup ($$$) {
468 my ($self, $art, $set_headers) = @_;
469 my $ng = $self->{ng};
473 if ($art =~ /\A[0-9]+\z/) {
474 $err = '423 no such article number in this group';
477 } elsif ($art =~ /\A<([^>]+)>\z/) {
480 $n = $ng->mm->num_for($mid) if $ng;
481 goto found if defined $n;
482 foreach my $g (values %{$self->{nntpd}->{groups}}) {
483 $n = $g->mm->num_for($mid);
494 $err = '420 no current article has been selected';
495 $n = $self->{article};
496 defined $n or return $err;
498 $ng or return '412 no newsgroup has been selected';
499 $mid = $ng->mm->mid_for($n);
500 defined $mid or return $err;
503 my $smsg = $ng->over->get_art($n) or return $err;
504 my $msg = $ng->msg_by_smsg($smsg) or return $err;
505 my $s = Email::Simple->new($msg);
507 set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
510 $s->body_set('') if ($set_headers == 2);
512 [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
515 sub simple_body_write ($$) {
519 $body =~ s/^\./../smg;
520 $body =~ s/(?<!\r)\n/\r\n/sg;
521 msg_more($self, $body);
522 msg_more($self, "\r\n") unless $body =~ /\r\n\z/s;
527 my ($self, $art) = @_;
528 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
532 my $hdr = $_[0]->header_obj->as_string;
534 $hdr =~ s/(?<!\r)\n/\r\n/sg;
536 # for leafnode compatibility, we need to ensure Message-ID headers
537 # are only a single line. We can't subclass Email::Simple::Header
538 # and override _default_fold_at in here, either; since that won't
539 # affect messages already in the archive.
540 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
545 sub cmd_article ($;$) {
546 my ($self, $art) = @_;
547 my $r = art_lookup($self, $art, 1);
548 return $r unless ref $r;
549 my ($n, $mid, $s) = @$r;
550 set_art($self, $art);
551 more($self, "220 $n <$mid> article retrieved - head and body follow");
552 msg_more($self, _header($s));
553 msg_more($self, "\r\n");
554 simple_body_write($self, $s);
558 my ($self, $art) = @_;
559 my $r = art_lookup($self, $art, 2);
560 return $r unless ref $r;
561 my ($n, $mid, $s) = @$r;
562 set_art($self, $art);
563 more($self, "221 $n <$mid> article retrieved - head follows");
564 msg_more($self, _header($s));
569 my ($self, $art) = @_;
570 my $r = art_lookup($self, $art, 0);
571 return $r unless ref $r;
572 my ($n, $mid, $s) = @$r;
573 set_art($self, $art);
574 more($self, "222 $n <$mid> article retrieved - body follows");
575 simple_body_write($self, $s);
579 my ($self, $art) = @_;
580 my $r = art_lookup($self, $art, 0);
581 return $r unless ref $r;
582 my ($n, $mid, undef) = @$r;
583 set_art($self, $art);
584 "223 $n <$mid> article retrieved - request text separately";
587 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
589 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
593 more($self, '100 help text follows');
598 my ($self, $range) = @_;
599 my $ng = $self->{ng} or return '412 no news group has been selected';
600 defined $range or return '420 No article(s) selected';
602 my ($min, $max) = $ng->mm->minmax;
603 if ($range =~ /\A([0-9]+)\z/) {
605 } elsif ($range =~ /\A([0-9]+)-\z/) {
606 ($beg, $end) = ($1, $max);
607 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
608 ($beg, $end) = ($1, $2);
612 $beg = $min if ($beg < $min);
613 $end = $max if ($end > $max);
614 return '420 No article(s) selected' if ($beg > $end);
618 sub long_response ($$) {
619 my ($self, $cb) = @_;
620 die "BUG: nested long response" if $self->{long_res};
622 my $fd = fileno($self->{sock});
623 defined $fd or return;
624 # make sure we disable reading during a long response,
625 # clients should not be sending us stuff and making us do more
626 # work while we are stream a response to them
627 $self->watch_read(0);
629 $self->{long_res} = sub {
630 my $more = eval { $cb->() };
631 if ($@ || !$self->{sock}) {
632 $self->{long_res} = undef;
636 "%s during long response[$fd] - %0.6f",
640 update_idle_time($self);
643 out($self, " deferred[$fd] aborted - %0.6f",
646 } elsif ($more) { # $self->{wbuf}:
647 # no recursion, schedule another call ASAP
648 # but only after all pending writes are done
649 update_idle_time($self);
652 $nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
654 $self->{long_res} = undef;
657 out($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};
925 # Do not watch for readability if we have data in the queue,
926 # instead re-enable watching for readability when we can
927 $self->watch_read(0) if (!$done || $self->{long_res});
933 my ($self, $fmt, @args) = @_;
934 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
938 my ($self, $fmt, @args) = @_;
939 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
945 return unless $self->flush_write && $self->{sock};
946 return if $self->{long_res};
948 update_idle_time($self);
949 # only read more requests if we've drained the write buffer,
950 # otherwise we can be buffering infinitely w/o backpressure
952 use constant LINE_MAX => 512; # RFC 977 section 2.3
953 my $rbuf = \($self->{rbuf});
956 if (index($$rbuf, "\n") < 0) {
957 my $off = length($$rbuf);
958 $r = sysread($self->{sock}, $$rbuf, LINE_MAX, $off);
959 unless (defined $r) {
960 return if $!{EAGAIN};
963 return $self->close if $r == 0;
966 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
968 return $self->close if $line =~ /[[:cntrl:]]/s;
970 my $fd = fileno($self->{sock});
971 $r = eval { process_line($self, $line) };
972 my $d = $self->{long_res} ?
973 " deferred[$fd]" : '';
974 out($self, "[$fd] %s - %0.6f$d", $line, now() - $t0);
977 return $self->close if $r < 0;
978 my $len = length($$rbuf);
979 return $self->close if ($len >= LINE_MAX);
980 update_idle_time($self);
985 if (index($self->{rbuf}, "\n") >= 0) {
986 # Force another read if there is a pipelined request.
987 # We don't know if the socket has anything for us to read,
988 # and we must double-check again by the time the timer fires
989 # in case we really did dispatch a read event and started
990 # another long response.
992 $nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
994 # no pipelined requests available, let the kernel know
995 # to wake us up if there's more
996 $self->watch_read(1); # PublicInbox::DS::watch_read
1000 sub not_idle_long ($$) {
1001 my ($self, $now) = @_;
1002 my $sock = $self->{sock} or return;
1003 my $ary = $EXPMAP->{fileno($sock)} or return;
1004 my $exp_at = $ary->[0] + $EXPTIME;
1008 # for graceful shutdown in PublicInbox::Daemon:
1010 my ($self, $now) = @_;
1011 ($self->{rbuf} ne '' || $self->{long_res} ||
1012 $self->{wbuf} || not_idle_long($self, $now));