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(EPOLLIN EPOLLONESHOT);
29 my @OVERVIEW = qw(Subject From Date Message-ID References Xref);
30 my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines)) . ":\r\n";
31 my $LIST_HEADERS = join("\r\n", @OVERVIEW,
32 qw(:bytes :lines Xref To Cc)) . "\r\n";
34 # disable commands with easy DoS potential:
35 my %DISABLED; # = map { $_ => 1 } qw(xover list_overview_fmt newnews xhdr);
37 my $EXPMAP; # fd -> [ idle_time, $self ]
39 our $EXPTIME = 180; # 3 minutes
47 foreach my $nntp (@$q) {
48 # for request && response protocols, always finish writing
49 # before finishing reading:
50 if (my $long_cb = $nntp->{long_res}) {
51 $nntp->write($long_cb);
53 # pipelined request, we bypassed socket-readiness
60 sub update_idle_time ($) {
62 my $sock = $self->{sock} or return;
63 $EXPMAP->{fileno($sock)} = [ now(), $self ];
69 my $old = $now - $exp;
72 while (my ($fd, $v) = each %$EXPMAP) {
73 my ($idle_time, $nntp) = @$v;
74 if ($idle_time < $old) {
75 $nntp->close; # idempotent
83 $expt = PublicInbox::EvCleanup::later(*expire_old);
86 # noop to kick outselves out of the loop ASAP so descriptors
88 PublicInbox::EvCleanup::asap(sub {});
93 my ($class, $sock, $nntpd) = @_;
94 my $self = fields::new($class);
95 $self->SUPER::new($sock, EPOLLIN | EPOLLONESHOT);
96 $self->{nntpd} = $nntpd;
97 res($self, '201 ' . $nntpd->{servername} . ' ready - post via email');
99 update_idle_time($self);
100 $expt ||= PublicInbox::EvCleanup::later(*expire_old);
105 my ($cb, $argc) = @_;
106 my $tot = prototype $cb;
107 my ($nreq, undef) = split(';', $tot);
108 $nreq = ($nreq =~ tr/$//) - 1;
109 $tot = ($tot =~ tr/$//) - 1;
110 ($argc <= $tot && $argc >= $nreq);
113 # returns 1 if we can continue, 0 if not due to buffered writes or disconnect
114 sub process_line ($$) {
116 my ($req, @args) = split(/[ \t]/, $l);
117 return 1 unless defined($req); # skip blank line
121 $req = $DISABLED{$req} ? undef : *{'cmd_'.$req}{CODE};
123 return res($self, '500 command not recognized') unless $req;
124 return res($self, r501) unless args_ok($req, scalar @args);
126 my $res = eval { $req->($self, @args) };
128 if ($err && $self->{sock}) {
131 err($self, 'error from: %s (%s)', $l, $err);
132 $res = '503 program fault - command not performed';
134 return 0 unless defined $res;
139 my ($self, $arg) = @_;
141 return r501 unless $arg eq 'READER';
142 '201 Posting prohibited';
145 sub cmd_slave ($) { '202 slave status noted' }
147 sub cmd_xgtitle ($;$) {
148 my ($self, $wildmat) = @_;
149 more($self, '282 list of groups and descriptions follows');
150 list_newsgroups($self, $wildmat);
154 sub list_overview_fmt ($) {
156 msg_more($self, $OVERVIEW_FMT);
159 sub list_headers ($;$) {
161 msg_more($self, $LIST_HEADERS);
164 sub list_active ($;$) {
165 my ($self, $wildmat) = @_;
166 wildmat2re($wildmat);
167 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
168 $ng->{newsgroup} =~ $wildmat or next;
169 group_line($self, $ng);
173 sub list_active_times ($;$) {
174 my ($self, $wildmat) = @_;
175 wildmat2re($wildmat);
176 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
177 $ng->{newsgroup} =~ $wildmat or next;
178 my $c = eval { $ng->mm->created_at } || time;
179 more($self, "$ng->{newsgroup} $c $ng->{-primary_address}");
183 sub list_newsgroups ($;$) {
184 my ($self, $wildmat) = @_;
185 wildmat2re($wildmat);
186 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
187 $ng->{newsgroup} =~ $wildmat or next;
188 my $d = $ng->description;
189 more($self, "$ng->{newsgroup} $d");
193 # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported
194 sub cmd_list ($;$$) {
195 my ($self, @args) = @_;
197 my $arg = shift @args;
198 $arg =~ tr/A-Z./a-z_/;
200 return r501 if $DISABLED{$arg};
206 return r501 unless $arg && args_ok($arg, scalar @args);
207 more($self, '215 information follows');
208 $arg->($self, @args);
210 more($self, '215 list of newsgroups follows');
211 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
212 group_line($self, $ng);
218 sub cmd_listgroup ($;$) {
219 my ($self, $group) = @_;
220 if (defined $group) {
221 my $res = cmd_group($self, $group);
222 return $res if ($res !~ /\A211 /);
226 $self->{ng} or return '412 no newsgroup selected';
228 long_response($self, sub {
229 my $ary = $self->{ng}->mm->ids_after(\$n);
230 scalar @$ary or return;
231 more($self, join("\r\n", @$ary));
236 sub parse_time ($$;$) {
237 my ($date, $time, $gmt) = @_;
238 my ($hh, $mm, $ss) = unpack('A2A2A2', $time);
240 $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt";
243 my @now = $gmt ? gmtime : localtime;
244 my ($YYYY, $MM, $DD);
245 if (length($date) == 8) { # RFC 3977 allows YYYYMMDD
246 ($YYYY, $MM, $DD) = unpack('A4A2A2', $date);
247 } else { # legacy clients send YYMMDD
248 ($YYYY, $MM, $DD) = unpack('A2A2A2', $date);
249 my $cur_year = $now[5] + 1900;
250 if ($YYYY > $cur_year) {
251 $YYYY += int($cur_year / 1000) * 1000 - 100;
255 timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
257 timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY);
261 sub group_line ($$) {
262 my ($self, $ng) = @_;
263 my ($min, $max) = $ng->mm->minmax;
264 more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max;
267 sub cmd_newgroups ($$$;$$) {
268 my ($self, $date, $time, $gmt, $dists) = @_;
269 my $ts = eval { parse_time($date, $time, $gmt) };
273 more($self, '231 list of new newsgroups follows');
274 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
275 my $c = eval { $ng->mm->created_at } || 0;
276 next unless $c > $ts;
277 group_line($self, $ng);
282 sub wildmat2re (;$) {
283 return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*');
288 $tmp =~ s#(?<!\\)\[(.+)(?<!\\)\]#
290 my $key = sha1_hex($orig . $salt);
291 $orig =~ s/([^\w\-])+/\Q$1/g;
295 my %map = ('*' => '.*', '?' => '.' );
296 $tmp =~ s#(?<!\\)([^\w\\])#$map{$1} || "\Q$1"#ge;
298 $tmp =~ s#([a-f0-9]{40})#
299 my $orig = $keep{$1};
300 defined $orig ? $orig : $1;
303 $_[0] = qr/\A$tmp\z/;
307 return $_[0] = qr/\A\z/ unless defined $_[0];
308 my %map = ('*' => '.*', ',' => '|');
309 $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge;
310 $_[0] = qr/\A(?:$_[0])\z/;
313 sub cmd_newnews ($$$$;$$) {
314 my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_;
315 my $ts = eval { parse_time($date, $time, $gmt) };
317 more($self, '230 list of new articles by message-id follows');
318 my ($keep, $skip) = split('!', $newsgroups, 2);
322 foreach my $ng (@{$self->{nntpd}->{grouplist}}) {
323 $ng->{newsgroup} =~ $keep or next;
324 $ng->{newsgroup} =~ $skip and next;
325 my $over = $ng->over or next;
328 return '.' unless @over;
331 long_response($self, sub {
333 my $msgs = $over->query_ts($ts, $prev);
336 join(">\r\n<", map { $_->mid } @$msgs ).
338 $prev = $msgs->[-1]->{num};
341 if (@over) { # continue onto next newsgroup
344 } else { # break out of the long response.
352 my ($self, $group) = @_;
353 my $no_such = '411 no such news group';
354 my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such;
357 my ($min, $max) = $ng->mm->minmax;
360 $self->{article} = $min;
361 my $est_size = $max - $min;
362 "211 $est_size $min $max $group";
365 sub article_adj ($$) {
366 my ($self, $off) = @_;
367 my $ng = $self->{ng} or return '412 no newsgroup selected';
369 my $n = $self->{article};
370 defined $n or return '420 no current article has been selected';
373 my $mid = $ng->mm->mid_for($n);
375 $n = $off > 0 ? 'next' : 'previous';
376 return "421 no $n article in this group";
378 $self->{article} = $n;
379 "223 $n <$mid> article retrieved - request text separately";
382 sub cmd_next ($) { article_adj($_[0], 1) }
383 sub cmd_last ($) { article_adj($_[0], -1) }
385 # We want to encourage using email and CC-ing everybody involved to avoid
386 # the single-point-of-failure a single server provides.
389 my $ng = $self->{ng};
390 $ng ? "440 mailto:$ng->{-primary_address} to post"
391 : '440 posting not allowed'
396 res($self, '205 closing connection - goodbye!');
401 sub header_append ($$$) {
402 my ($hdr, $k, $v) = @_;
403 my @v = $hdr->header($k);
407 $hdr->header_set($k, @v, $v);
411 my ($self, $ng, $n, $mid) = @_;
412 my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n";
414 # num_for is pretty cheap and sometimes we'll lookup the existence
415 # of an article without getting even the OVER info. In other words,
416 # I'm not sure if its worth optimizing by scanning To:/Cc: and
417 # PublicInbox::ExtMsg on the PSGI end is just as expensive
418 foreach my $other (@{$self->{nntpd}->{grouplist}}) {
419 next if $ng eq $other;
420 my $num = eval { $other->mm->num_for($mid) } or next;
421 $ret .= " $other->{newsgroup}:$num";
426 sub set_nntp_headers ($$$$$) {
427 my ($self, $hdr, $ng, $n, $mid) = @_;
429 # why? leafnode requires a Path: header for some inexplicable
430 # reason. We'll fake the shortest one possible.
431 $hdr->header_set('Path', 'y');
433 # leafnode (and maybe other NNTP clients) have trouble dealing
434 # with v2 messages which have multiple Message-IDs (either due
435 # to our own content-based dedupe or buggy git-send-email versions).
436 my @mids = $hdr->header('Message-ID');
437 if (scalar(@mids) > 1) {
439 $hdr->header_set('Message-ID', $mid0);
440 my @alt = $hdr->header('X-Alt-Message-ID');
441 my %seen = map { $_ => 1 } (@alt, $mid0);
442 foreach my $m (@mids) {
446 $hdr->header_set('X-Alt-Message-ID', @alt);
450 my $xref = xref($self, $ng, $n, $mid);
451 $hdr->header_set('Xref', $xref);
452 $xref =~ s/:[0-9]+//g;
453 $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]);
454 header_append($hdr, 'List-Post', "<mailto:$ng->{-primary_address}>");
455 if (my $url = $ng->base_url) {
456 $mid = mid_escape($mid);
457 header_append($hdr, 'Archived-At', "<$url$mid/>");
458 header_append($hdr, 'List-Archive', "<$url>");
462 sub art_lookup ($$$) {
463 my ($self, $art, $set_headers) = @_;
464 my $ng = $self->{ng};
468 if ($art =~ /\A[0-9]+\z/) {
469 $err = '423 no such article number in this group';
472 } elsif ($art =~ /\A<([^>]+)>\z/) {
475 $n = $ng->mm->num_for($mid) if $ng;
476 goto found if defined $n;
477 foreach my $g (values %{$self->{nntpd}->{groups}}) {
478 $n = $g->mm->num_for($mid);
489 $err = '420 no current article has been selected';
490 $n = $self->{article};
491 defined $n or return $err;
493 $ng or return '412 no newsgroup has been selected';
494 $mid = $ng->mm->mid_for($n);
495 defined $mid or return $err;
498 my $smsg = $ng->over->get_art($n) or return $err;
499 my $msg = $ng->msg_by_smsg($smsg) or return $err;
500 my $s = Email::Simple->new($msg);
502 set_nntp_headers($self, $s->header_obj, $ng, $n, $mid);
505 $s->body_set('') if ($set_headers == 2);
507 [ $n, $mid, $s, $smsg->bytes, $smsg->lines, $ng ];
510 sub simple_body_write ($$) {
514 $body =~ s/^\./../smg;
515 $body =~ s/(?<!\r)\n/\r\n/sg;
516 msg_more($self, $body);
517 msg_more($self, "\r\n") unless $body =~ /\r\n\z/s;
522 my ($self, $art) = @_;
523 $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/;
527 my $hdr = $_[0]->header_obj->as_string;
529 $hdr =~ s/(?<!\r)\n/\r\n/sg;
531 # for leafnode compatibility, we need to ensure Message-ID headers
532 # are only a single line. We can't subclass Email::Simple::Header
533 # and override _default_fold_at in here, either; since that won't
534 # affect messages already in the archive.
535 $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
540 sub cmd_article ($;$) {
541 my ($self, $art) = @_;
542 my $r = art_lookup($self, $art, 1);
543 return $r unless ref $r;
544 my ($n, $mid, $s) = @$r;
545 set_art($self, $art);
546 more($self, "220 $n <$mid> article retrieved - head and body follow");
547 msg_more($self, _header($s));
548 msg_more($self, "\r\n");
549 simple_body_write($self, $s);
553 my ($self, $art) = @_;
554 my $r = art_lookup($self, $art, 2);
555 return $r unless ref $r;
556 my ($n, $mid, $s) = @$r;
557 set_art($self, $art);
558 more($self, "221 $n <$mid> article retrieved - head follows");
559 msg_more($self, _header($s));
564 my ($self, $art) = @_;
565 my $r = art_lookup($self, $art, 0);
566 return $r unless ref $r;
567 my ($n, $mid, $s) = @$r;
568 set_art($self, $art);
569 more($self, "222 $n <$mid> article retrieved - body follows");
570 simple_body_write($self, $s);
574 my ($self, $art) = @_;
575 my $r = art_lookup($self, $art, 0);
576 return $r unless ref $r;
577 my ($n, $mid, undef) = @$r;
578 set_art($self, $art);
579 "223 $n <$mid> article retrieved - request text separately";
582 sub cmd_ihave ($) { '435 article not wanted - do not send it' }
584 sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) }
588 more($self, '100 help text follows');
593 my ($self, $range) = @_;
594 my $ng = $self->{ng} or return '412 no news group has been selected';
595 defined $range or return '420 No article(s) selected';
597 my ($min, $max) = $ng->mm->minmax;
598 if ($range =~ /\A([0-9]+)\z/) {
600 } elsif ($range =~ /\A([0-9]+)-\z/) {
601 ($beg, $end) = ($1, $max);
602 } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) {
603 ($beg, $end) = ($1, $2);
607 $beg = $min if ($beg < $min);
608 $end = $max if ($end > $max);
609 return '420 No article(s) selected' if ($beg > $end);
613 sub long_response ($$) {
614 my ($self, $cb) = @_;
615 die "BUG: nested long response" if $self->{long_res};
617 my $fd = fileno($self->{sock});
618 defined $fd or return;
619 # make sure we disable reading during a long response,
620 # clients should not be sending us stuff and making us do more
621 # work while we are stream a response to them
623 $self->{long_res} = sub {
624 my $more = eval { $cb->() };
625 if ($@ || !$self->{sock}) { # something bad happened...
626 $self->{long_res} = undef;
630 "%s during long response[$fd] - %0.6f",
634 update_idle_time($self);
637 out($self, " deferred[$fd] aborted - %0.6f",
640 } elsif ($more) { # $self->{wbuf}:
641 # no recursion, schedule another call ASAP
642 # but only after all pending writes are done
643 update_idle_time($self);
646 $nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
648 $self->{long_res} = undef;
651 out($self, " deferred[$fd] done - %0.6f", now() - $t0);
654 $self->{long_res}->(); # kick off!
658 sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull.
659 my ($self, $xhdr, $range) = @_;
661 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
662 my ($ng, $n) = mid_lookup($self, $1);
663 return r430 unless $n;
664 hdr_mid_response($self, $xhdr, $ng, $n, $range, $range);
665 } else { # numeric range
666 $range = $self->{article} unless defined $range;
667 my $r = get_range($self, $range);
668 return $r unless ref $r;
669 my $mm = $self->{ng}->mm;
670 my ($beg, $end) = @$r;
671 more($self, $xhdr ? r221 : r225);
672 long_response($self, sub {
673 my $r = $mm->msg_range(\$beg, $end);
675 more($self, join("\r\n", map {
683 sub mid_lookup ($$) {
684 my ($self, $mid) = @_;
685 my $self_ng = $self->{ng};
687 my $n = $self_ng->mm->num_for($mid);
688 return ($self_ng, $n) if defined $n;
690 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
691 next if defined $self_ng && $ng eq $self_ng;
692 my $n = $ng->mm->num_for($mid);
693 return ($ng, $n) if defined $n;
698 sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin
699 my ($self, $xhdr, $range) = @_;
701 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
703 my ($ng, $n) = mid_lookup($self, $mid);
704 return r430 unless $n;
705 hdr_mid_response($self, $xhdr, $ng, $n, $range,
706 xref($self, $ng, $n, $mid));
707 } else { # numeric range
708 $range = $self->{article} unless defined $range;
709 my $r = get_range($self, $range);
710 return $r unless ref $r;
711 my $ng = $self->{ng};
713 my ($beg, $end) = @$r;
714 more($self, $xhdr ? r221 : r225);
715 long_response($self, sub {
716 my $r = $mm->msg_range(\$beg, $end);
718 more($self, join("\r\n", map {
720 "$num ".xref($self, $ng, $num, $_->[1]);
727 sub over_header_for {
728 my ($over, $num, $field) = @_;
729 my $smsg = $over->get_art($num) or return;
730 return PublicInbox::SearchMsg::date($smsg) if $field eq 'date';
734 sub hdr_searchmsg ($$$$) {
735 my ($self, $xhdr, $field, $range) = @_;
736 if (defined $range && $range =~ /\A<(.+)>\z/) { # Message-ID
737 my ($ng, $n) = mid_lookup($self, $1);
738 return r430 unless defined $n;
739 my $v = over_header_for($ng->over, $n, $field);
740 hdr_mid_response($self, $xhdr, $ng, $n, $range, $v);
741 } else { # numeric range
742 $range = $self->{article} unless defined $range;
743 my $over = $self->{ng}->over;
744 my $mm = $self->{ng}->mm;
745 my $r = get_range($self, $range);
746 return $r unless ref $r;
747 my ($beg, $end) = @$r;
748 more($self, $xhdr ? r221 : r225);
750 long_response($self, sub {
751 my $msgs = $over->query_xover($cur, $end);
752 my $nr = scalar @$msgs or return;
754 foreach my $s (@$msgs) {
755 $tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
758 msg_more($self, $tmp);
759 $cur = $msgs->[-1]->{num} + 1;
765 my ($self, $xhdr, $header, $range) = @_;
766 my $sub = lc $header;
767 if ($sub eq 'message-id') {
768 hdr_message_id($self, $xhdr, $range);
769 } elsif ($sub eq 'xref') {
770 hdr_xref($self, $xhdr, $range);
771 } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc|
773 hdr_searchmsg($self, $xhdr, $sub, $range);
774 } elsif ($sub =~ /\A:(bytes|lines)\z/) {
775 hdr_searchmsg($self, $xhdr, $1, $range);
777 $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header";
783 my ($self, $header, $range) = @_;
784 do_hdr($self, 0, $header, $range);
788 sub cmd_xhdr ($$;$) {
789 my ($self, $header, $range) = @_;
790 do_hdr($self, 1, $header, $range);
793 sub hdr_mid_prefix ($$$$$) {
794 my ($self, $xhdr, $ng, $n, $mid) = @_;
795 return $mid if $xhdr;
797 # HDR for RFC 3977 users
798 if (my $self_ng = $self->{ng}) {
799 ($self_ng eq $ng) ? $n : '0';
805 sub hdr_mid_response ($$$$$$) {
806 my ($self, $xhdr, $ng, $n, $mid, $v) = @_; # r: art_lookup result
809 $res .= r221 . "\r\n";
810 $res .= "$mid $v\r\n";
812 $res .= r225 . "\r\n";
813 my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid);
814 $res .= "$pfx $v\r\n";
816 res($self, $res .= '.');
820 sub cmd_xrover ($;$) {
821 my ($self, $range) = @_;
822 my $ng = $self->{ng} or return '412 no newsgroup selected';
823 (defined $range && $range =~ /[<>]/) and
824 return '420 No article(s) selected'; # no message IDs
826 $range = $self->{article} unless defined $range;
827 my $r = get_range($self, $range);
828 return $r unless ref $r;
829 my ($beg, $end) = @$r;
831 my $over = $ng->over;
832 more($self, '224 Overview information follows');
834 long_response($self, sub {
835 my $h = over_header_for($over, $beg, 'references');
836 more($self, "$beg $h") if defined($h);
841 sub over_line ($$$$) {
842 my ($self, $ng, $num, $smsg) = @_;
843 # n.b. field access and procedural calls can be
844 # 10%-15% faster than OO method calls:
845 my $s = join("\t", $num,
848 PublicInbox::SearchMsg::date($smsg),
853 "Xref: " . xref($self, $ng, $num, $smsg->{mid}));
859 my ($self, $range) = @_;
860 if ($range && $range =~ /\A<(.+)>\z/) {
861 my ($ng, $n) = mid_lookup($self, $1);
862 defined $n or return r430;
863 my $smsg = $ng->over->get_art($n) or return r430;
864 more($self, '224 Overview information follows (multi-line)');
866 # Only set article number column if it's the current group
867 my $self_ng = $self->{ng};
868 $n = 0 if (!$self_ng || $self_ng ne $ng);
869 more($self, over_line($self, $ng, $n, $smsg));
872 cmd_xover($self, $range);
876 sub cmd_xover ($;$) {
877 my ($self, $range) = @_;
878 $range = $self->{article} unless defined $range;
879 my $r = get_range($self, $range);
880 return $r unless ref $r;
881 my ($beg, $end) = @$r;
882 more($self, "224 Overview information follows for $beg to $end");
883 my $over = $self->{ng}->over;
885 long_response($self, sub {
886 my $msgs = $over->query_xover($cur, $end);
887 my $nr = scalar @$msgs or return;
890 more($self, join("\r\n", map {
891 over_line($self, $self->{ng}, $_->{num}, $_);
893 $cur = $msgs->[-1]->{num} + 1;
898 my ($self, $mid) = @_;
899 return r501 unless $mid =~ /\A<(.+)>\z/;
902 foreach my $ng (values %{$self->{nntpd}->{groups}}) {
903 my $n = $ng->mm->num_for($mid);
904 push @paths, "$ng->{newsgroup}/$n" if defined $n;
906 return '430 no such article on server' unless @paths;
907 '223 '.join(' ', @paths);
910 sub res ($$) { do_write($_[0], $_[1] . "\r\n") }
912 sub more ($$) { msg_more($_[0], $_[1] . "\r\n") }
916 my $done = $self->write(\($_[1]));
917 return 0 unless $self->{sock};
923 my ($self, $fmt, @args) = @_;
924 printf { $self->{nntpd}->{err} } $fmt."\n", @args;
928 my ($self, $fmt, @args) = @_;
929 printf { $self->{nntpd}->{out} } $fmt."\n", @args;
935 return unless $self->flush_write && $self->{sock};
937 update_idle_time($self);
938 # only read more requests if we've drained the write buffer,
939 # otherwise we can be buffering infinitely w/o backpressure
941 use constant LINE_MAX => 512; # RFC 977 section 2.3
942 my $rbuf = \($self->{rbuf});
945 if (index($$rbuf, "\n") < 0) {
946 my $off = length($$rbuf);
947 $r = sysread($self->{sock}, $$rbuf, LINE_MAX, $off);
948 unless (defined $r) {
949 return $self->watch_in1 if $!{EAGAIN};
952 return $self->close if $r == 0;
955 while ($r > 0 && $$rbuf =~ s/\A[ \t\r\n]*([^\r\n]*)\r?\n//) {
957 return $self->close if $line =~ /[[:cntrl:]]/s;
959 my $fd = fileno($self->{sock});
960 $r = eval { process_line($self, $line) };
961 my $d = $self->{long_res} ?
962 " deferred[$fd]" : '';
963 out($self, "[$fd] %s - %0.6f$d", $line, now() - $t0);
966 return $self->close if $r < 0;
967 my $len = length($$rbuf);
968 return $self->close if ($len >= LINE_MAX);
969 update_idle_time($self);
971 # maybe there's more pipelined data, or we'll have
972 # to register it for socket-readiness notifications
973 check_read($self) unless ($self->{long_res} || $self->{wbuf});
978 if (index($self->{rbuf}, "\n") >= 0) {
979 # Force another read if there is a pipelined request.
980 # We don't know if the socket has anything for us to read,
981 # and we must double-check again by the time the timer fires
982 # in case we really did dispatch a read event and started
983 # another long response.
985 $nextt ||= PublicInbox::EvCleanup::asap(*next_tick);
987 # no pipelined requests available, let the kernel know
988 # to wake us up if there's more
989 $self->watch_in1; # PublicInbox::DS::watch_in1
993 sub not_idle_long ($$) {
994 my ($self, $now) = @_;
995 my $sock = $self->{sock} or return;
996 my $ary = $EXPMAP->{fileno($sock)} or return;
997 my $exp_at = $ary->[0] + $EXPTIME;
1001 # for graceful shutdown in PublicInbox::Daemon:
1003 my ($self, $now) = @_;
1004 ($self->{rbuf} ne '' || $self->{long_res} ||
1005 $self->{wbuf} || not_idle_long($self, $now));