# Copyright (C) 2015-2020 all contributors # License: AGPL-3.0+ # # Each instance of this represents a NNTP client socket package PublicInbox::NNTP; use strict; use warnings; use base qw(PublicInbox::DS); use fields qw(nntpd article ng long_cb); use PublicInbox::MID qw(mid_escape $MID_EXTRACT); use Email::Simple; use POSIX qw(strftime); use PublicInbox::DS qw(now); use Digest::SHA qw(sha1_hex); use Time::Local qw(timegm timelocal); use constant { LINE_MAX => 512, # RFC 977 section 2.3 r501 => '501 command syntax error', r502 => '502 Command unavailable', r221 => '221 Header follows', r224 => '224 Overview information follows (multi-line)', r225 => '225 Headers follow (multi-line)', r430 => '430 No article with that message-id', }; use PublicInbox::Syscall qw(EPOLLIN EPOLLONESHOT); use Errno qw(EAGAIN); my $ONE_MSGID = qr/\A$MID_EXTRACT\z/; my @OVERVIEW = qw(Subject From Date Message-ID References); my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines), '') . "Xref:full\r\n"; my $LIST_HEADERS = join("\r\n", @OVERVIEW, qw(:bytes :lines Xref To Cc)) . "\r\n"; my $CAPABILITIES = <<""; 101 Capability list:\r VERSION 2\r READER\r NEWNEWS\r LIST ACTIVE ACTIVE.TIMES NEWSGROUPS OVERVIEW.FMT\r HDR\r OVER\r my $have_deflate; sub greet ($) { $_[0]->write($_[0]->{nntpd}->{greet}) }; sub new ($$$) { my ($class, $sock, $nntpd) = @_; my $self = fields::new($class); my $ev = EPOLLIN; my $wbuf; if (ref($sock) eq 'IO::Socket::SSL' && !$sock->accept_SSL) { return CORE::close($sock) if $! != EAGAIN; $ev = PublicInbox::TLS::epollbit(); $wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ]; } $self->SUPER::new($sock, $ev | EPOLLONESHOT); $self->{nntpd} = $nntpd; if ($wbuf) { $self->{wbuf} = $wbuf; } else { greet($self); } $self->update_idle_time; $self; } sub args_ok ($$) { my ($cb, $argc) = @_; my $tot = prototype $cb; my ($nreq, undef) = split(';', $tot); $nreq = ($nreq =~ tr/$//) - 1; $tot = ($tot =~ tr/$//) - 1; ($argc <= $tot && $argc >= $nreq); } # returns 1 if we can continue, 0 if not due to buffered writes or disconnect sub process_line ($$) { my ($self, $l) = @_; my ($req, @args) = split(/[ \t]+/, $l); return 1 unless defined($req); # skip blank line $req = $self->can('cmd_'.lc($req)); return res($self, '500 command not recognized') unless $req; return res($self, r501) unless args_ok($req, scalar @args); my $res = eval { $req->($self, @args) }; my $err = $@; if ($err && $self->{sock}) { local $/ = "\n"; chomp($l); err($self, 'error from: %s (%s)', $l, $err); $res = '503 program fault - command not performed'; } return 0 unless defined $res; res($self, $res); } # The keyword argument is not used (rfc3977 5.2.2) sub cmd_capabilities ($;$) { my ($self, undef) = @_; my $res = $CAPABILITIES; if (ref($self->{sock}) ne 'IO::Socket::SSL' && $self->{nntpd}->{accept_tls}) { $res .= "STARTTLS\r\n"; } $res .= '.'; } sub cmd_mode ($$) { my ($self, $arg) = @_; $arg = uc $arg; return r501 unless $arg eq 'READER'; '201 Posting prohibited'; } sub cmd_slave ($) { '202 slave status noted' } sub cmd_xgtitle ($;$) { my ($self, $wildmat) = @_; more($self, '282 list of groups and descriptions follows'); list_newsgroups($self, $wildmat); '.' } sub list_overview_fmt ($) { my ($self) = @_; $self->msg_more($OVERVIEW_FMT); } sub list_headers ($;$) { my ($self) = @_; $self->msg_more($LIST_HEADERS); } sub list_active ($;$) { my ($self, $wildmat) = @_; wildmat2re($wildmat); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { $ng->{newsgroup} =~ $wildmat or next; group_line($self, $ng); } } sub list_active_times ($;$) { my ($self, $wildmat) = @_; wildmat2re($wildmat); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { $ng->{newsgroup} =~ $wildmat or next; my $c = eval { $ng->mm->created_at } || time; more($self, "$ng->{newsgroup} $c $ng->{-primary_address}"); } } sub list_newsgroups ($;$) { my ($self, $wildmat) = @_; wildmat2re($wildmat); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { $ng->{newsgroup} =~ $wildmat or next; my $d = $ng->description; more($self, "$ng->{newsgroup} $d"); } } # LIST SUBSCRIPTIONS, DISTRIB.PATS are not supported sub cmd_list ($;$$) { my ($self, @args) = @_; if (scalar @args) { my $arg = shift @args; $arg =~ tr/A-Z./a-z_/; $arg = "list_$arg"; $arg = $self->can($arg); return r501 unless $arg && args_ok($arg, scalar @args); more($self, '215 information follows'); $arg->($self, @args); } else { more($self, '215 list of newsgroups follows'); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { group_line($self, $ng); } } '.' } sub listgroup_range_i { my ($self, $beg, $end) = @_; my $r = $self->{ng}->mm->msg_range($beg, $end, 'num'); scalar(@$r) or return; more($self, join("\r\n", map { $_->[0] } @$r)); 1; } sub listgroup_all_i { my ($self, $num) = @_; my $ary = $self->{ng}->mm->ids_after($num); scalar(@$ary) or return; more($self, join("\r\n", @$ary)); 1; } sub cmd_listgroup ($;$$) { my ($self, $group, $range) = @_; if (defined $group) { my $res = cmd_group($self, $group); return $res if ($res !~ /\A211 /); more($self, $res); } $self->{ng} or return '412 no newsgroup selected'; if (defined $range) { my $r = get_range($self, $range); return $r unless ref $r; long_response($self, \&listgroup_range_i, @$r); } else { # grab every article number long_response($self, \&listgroup_all_i, \(my $num = 0)); } } sub parse_time ($$;$) { my ($date, $time, $gmt) = @_; my ($hh, $mm, $ss) = unpack('A2A2A2', $time); if (defined $gmt) { $gmt =~ /\A(?:UTC|GMT)\z/i or die "GM invalid: $gmt"; $gmt = 1; } my ($YYYY, $MM, $DD); if (bytes::length($date) == 8) { # RFC 3977 allows YYYYMMDD ($YYYY, $MM, $DD) = unpack('A4A2A2', $date); } else { # legacy clients send YYMMDD my $YY; ($YY, $MM, $DD) = unpack('A2A2A2', $date); my @now = $gmt ? gmtime : localtime; my $cur_year = $now[5] + 1900; my $cur_cent = int($cur_year / 100) * 100; $YYYY = (($YY + $cur_cent) > $cur_year) ? ($YY + 1900) : ($YY + $cur_cent); } if ($gmt) { timegm($ss, $mm, $hh, $DD, $MM - 1, $YYYY); } else { timelocal($ss, $mm, $hh, $DD, $MM - 1, $YYYY); } } sub group_line ($$) { my ($self, $ng) = @_; my ($min, $max) = $ng->mm->minmax; more($self, "$ng->{newsgroup} $max $min n") if defined $min && defined $max; } sub cmd_newgroups ($$$;$$) { my ($self, $date, $time, $gmt, $dists) = @_; my $ts = eval { parse_time($date, $time, $gmt) }; return r501 if $@; # TODO dists more($self, '231 list of new newsgroups follows'); foreach my $ng (@{$self->{nntpd}->{grouplist}}) { my $c = eval { $ng->mm->created_at } || 0; next unless $c > $ts; group_line($self, $ng); } '.' } sub wildmat2re (;$) { return $_[0] = qr/.*/ if (!defined $_[0] || $_[0] eq '*'); my %keep; my $salt = rand; my $tmp = $_[0]; $tmp =~ s#(? '.*', '?' => '.' ); $tmp =~ s#(? '.*', ',' => '|'); $_[0] =~ s!(.)!$map{$1} || "\Q$1"!ge; $_[0] = qr/\A(?:$_[0])\z/; } sub newnews_i { my ($self, $overs, $ts, $prev) = @_; my $over = $overs->[0]; my $msgs = $over->query_ts($ts, $$prev); if (scalar @$msgs) { more($self, '<' . join(">\r\n<", map { $_->mid } @$msgs ). '>'); $$prev = $msgs->[-1]->{num}; } else { shift @$overs; if (@$overs) { # continue onto next newsgroup $$prev = 0; return 1; } else { # break out of the long response. return; } } } sub cmd_newnews ($$$$;$$) { my ($self, $newsgroups, $date, $time, $gmt, $dists) = @_; my $ts = eval { parse_time($date, $time, $gmt) }; return r501 if $@; more($self, '230 list of new articles by message-id follows'); my ($keep, $skip) = split('!', $newsgroups, 2); ngpat2re($keep); ngpat2re($skip); my @overs; foreach my $ng (@{$self->{nntpd}->{grouplist}}) { $ng->{newsgroup} =~ $keep or next; $ng->{newsgroup} =~ $skip and next; my $over = $ng->over or next; push @overs, $over; }; return '.' unless @overs; my $prev = 0; long_response($self, \&newnews_i, \@overs, $ts, \$prev); } sub cmd_group ($$) { my ($self, $group) = @_; my $no_such = '411 no such news group'; my $ng = $self->{nntpd}->{groups}->{$group} or return $no_such; $self->{ng} = $ng; my ($min, $max) = $ng->mm->minmax; $min ||= 0; $max ||= 0; $self->{article} = $min; my $est_size = $max - $min; "211 $est_size $min $max $group"; } sub article_adj ($$) { my ($self, $off) = @_; my $ng = $self->{ng} or return '412 no newsgroup selected'; my $n = $self->{article}; defined $n or return '420 no current article has been selected'; $n += $off; my $mid = $ng->mm->mid_for($n); unless ($mid) { $n = $off > 0 ? 'next' : 'previous'; return "421 no $n article in this group"; } $self->{article} = $n; "223 $n <$mid> article retrieved - request text separately"; } sub cmd_next ($) { article_adj($_[0], 1) } sub cmd_last ($) { article_adj($_[0], -1) } # We want to encourage using email and CC-ing everybody involved to avoid # the single-point-of-failure a single server provides. sub cmd_post ($) { my ($self) = @_; my $ng = $self->{ng}; $ng ? "440 mailto:$ng->{-primary_address} to post" : '440 posting not allowed' } sub cmd_quit ($) { my ($self) = @_; res($self, '205 closing connection - goodbye!'); $self->shutdn; undef; } sub header_append ($$$) { my ($hdr, $k, $v) = @_; my @v = $hdr->header($k); foreach (@v) { return if $v eq $_; } $hdr->header_set($k, @v, $v); } sub xref ($$$$) { my ($self, $ng, $n, $mid) = @_; my $ret = $self->{nntpd}->{servername} . " $ng->{newsgroup}:$n"; # num_for is pretty cheap and sometimes we'll lookup the existence # of an article without getting even the OVER info. In other words, # I'm not sure if its worth optimizing by scanning To:/Cc: and # PublicInbox::ExtMsg on the PSGI end is just as expensive foreach my $other (@{$self->{nntpd}->{grouplist}}) { next if $ng eq $other; my $num = eval { $other->mm->num_for($mid) } or next; $ret .= " $other->{newsgroup}:$num"; } $ret; } sub set_nntp_headers ($$$$$) { my ($self, $hdr, $ng, $n, $mid) = @_; # why? leafnode requires a Path: header for some inexplicable # reason. We'll fake the shortest one possible. $hdr->header_set('Path', 'y'); # leafnode (and maybe other NNTP clients) have trouble dealing # with v2 messages which have multiple Message-IDs (either due # to our own content-based dedupe or buggy git-send-email versions). my @mids = $hdr->header('Message-ID'); if (scalar(@mids) > 1) { my $mid0 = "<$mid>"; $hdr->header_set('Message-ID', $mid0); my @alt = $hdr->header('X-Alt-Message-ID'); my %seen = map { $_ => 1 } (@alt, $mid0); push(@alt, grep { !$seen{$_}++ } @mids); $hdr->header_set('X-Alt-Message-ID', @alt); } # clobber some my $xref = xref($self, $ng, $n, $mid); $hdr->header_set('Xref', $xref); $xref =~ s/:[0-9]+//g; $hdr->header_set('Newsgroups', (split(/ /, $xref, 2))[1]); header_append($hdr, 'List-Post', "{-primary_address}>"); if (my $url = $ng->base_url) { $mid = mid_escape($mid); header_append($hdr, 'Archived-At', "<$url$mid/>"); header_append($hdr, 'List-Archive', "<$url>"); } } sub art_lookup ($$$) { my ($self, $art, $set_headers) = @_; my $ng = $self->{ng}; my ($n, $mid); my $err; if (defined $art) { if ($art =~ /\A[0-9]+\z/) { $err = '423 no such article number in this group'; $n = int($art); goto find_mid; } elsif ($art =~ $ONE_MSGID) { $mid = $1; $err = r430; $n = $ng->mm->num_for($mid) if $ng; goto found if defined $n; foreach my $g (values %{$self->{nntpd}->{groups}}) { $n = $g->mm->num_for($mid); if (defined $n) { $ng = $g; goto found; } } return $err; } else { return r501; } } else { $err = '420 no current article has been selected'; $n = $self->{article}; defined $n or return $err; find_mid: $ng or return '412 no newsgroup has been selected'; $mid = $ng->mm->mid_for($n); defined $mid or return $err; } found: my $smsg = $ng->over->get_art($n) or return $err; my $msg = $ng->msg_by_smsg($smsg) or return $err; # Email::Simple->new will modify $msg in-place as documented # in its manpage, so what's left is the body and we won't need # to call Email::Simple::body(), later my $hdr = Email::Simple->new($msg)->header_obj; set_nntp_headers($self, $hdr, $ng, $n, $mid) if $set_headers; [ $n, $mid, $msg, $hdr ]; } sub msg_body_write ($$) { my ($self, $msg) = @_; # these can momentarily double the memory consumption :< $$msg =~ s/^\./../smg; $$msg =~ s/(?msg_more($$msg); '.' } sub set_art { my ($self, $art) = @_; $self->{article} = $art if defined $art && $art =~ /\A[0-9]+\z/; } sub msg_hdr_write ($$$) { my ($self, $hdr, $body_follows) = @_; $hdr = $hdr->as_string; utf8::encode($hdr); $hdr =~ s/(?msg_more($hdr); } sub cmd_article ($;$) { my ($self, $art) = @_; my $r = art_lookup($self, $art, 1); return $r unless ref $r; my ($n, $mid, $msg, $hdr) = @$r; set_art($self, $art); more($self, "220 $n <$mid> article retrieved - head and body follow"); msg_hdr_write($self, $hdr, 1); msg_body_write($self, $msg); } sub cmd_head ($;$) { my ($self, $art) = @_; my $r = art_lookup($self, $art, 2); return $r unless ref $r; my ($n, $mid, undef, $hdr) = @$r; set_art($self, $art); more($self, "221 $n <$mid> article retrieved - head follows"); msg_hdr_write($self, $hdr, 0); '.' } sub cmd_body ($;$) { my ($self, $art) = @_; my $r = art_lookup($self, $art, 0); return $r unless ref $r; my ($n, $mid, $msg) = @$r; set_art($self, $art); more($self, "222 $n <$mid> article retrieved - body follows"); msg_body_write($self, $msg); } sub cmd_stat ($;$) { my ($self, $art) = @_; my $r = art_lookup($self, $art, 0); return $r unless ref $r; my ($n, $mid) = @$r; set_art($self, $art); "223 $n <$mid> article retrieved - request text separately"; } sub cmd_ihave ($) { '435 article not wanted - do not send it' } sub cmd_date ($) { '111 '.strftime('%Y%m%d%H%M%S', gmtime(time)) } sub cmd_help ($) { my ($self) = @_; more($self, '100 help text follows'); '.' } sub get_range ($$) { my ($self, $range) = @_; my $ng = $self->{ng} or return '412 no news group has been selected'; defined $range or return '420 No article(s) selected'; my ($beg, $end); my ($min, $max) = $ng->mm->minmax; if ($range =~ /\A([0-9]+)\z/) { $beg = $end = $1; } elsif ($range =~ /\A([0-9]+)-\z/) { ($beg, $end) = ($1, $max); } elsif ($range =~ /\A([0-9]+)-([0-9]+)\z/) { ($beg, $end) = ($1, $2); } else { return r501; } $beg = $min if ($beg < $min); $end = $max if ($end > $max); return '420 No article(s) selected' if ($beg > $end); [ \$beg, $end ]; } sub long_step { my ($self) = @_; # wbuf is unset or empty, here; {long} may add to it my ($fd, $cb, $t0, @args) = @{$self->{long_cb}}; my $more = eval { $cb->($self, @args) }; if ($@ || !$self->{sock}) { # something bad happened... delete $self->{long_cb}; my $elapsed = now() - $t0; if ($@) { err($self, "%s during long response[$fd] - %0.6f", $@, $elapsed); } out($self, " deferred[$fd] aborted - %0.6f", $elapsed); $self->close; } elsif ($more) { # $self->{wbuf}: $self->update_idle_time; # COMPRESS users all share the same DEFLATE context. # Flush it here to ensure clients don't see # each other's data $self->zflush; # no recursion, schedule another call ASAP, but only after # all pending writes are done. autovivify wbuf: my $new_size = push(@{$self->{wbuf}}, \&long_step); # wbuf may be populated by $cb, no need to rearm if so: $self->requeue if $new_size == 1; } else { # all done! delete $self->{long_cb}; res($self, '.'); my $elapsed = now() - $t0; my $fd = fileno($self->{sock}); out($self, " deferred[$fd] done - %0.6f", $elapsed); my $wbuf = $self->{wbuf}; # do NOT autovivify $self->requeue unless $wbuf && @$wbuf; } } sub long_response ($$;@) { my ($self, $cb, @args) = @_; # cb returns true if more, false if done my $sock = $self->{sock} or return; # make sure we disable reading during a long response, # clients should not be sending us stuff and making us do more # work while we are stream a response to them $self->{long_cb} = [ fileno($sock), $cb, now(), @args ]; long_step($self); # kick off! undef; } sub hdr_msgid_range_i { my ($self, $beg, $end) = @_; my $r = $self->{ng}->mm->msg_range($beg, $end); @$r or return; more($self, join("\r\n", map { "$_->[0] <$_->[1]>" } @$r)); 1; } sub hdr_message_id ($$$) { # optimize XHDR Message-ID [range] for slrnpull. my ($self, $xhdr, $range) = @_; if (defined $range && $range =~ $ONE_MSGID) { my ($ng, $n) = mid_lookup($self, $1); return r430 unless $n; hdr_mid_response($self, $xhdr, $ng, $n, $range, $range); } else { # numeric range $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; more($self, $xhdr ? r221 : r225); long_response($self, \&hdr_msgid_range_i, @$r); } } sub mid_lookup ($$) { my ($self, $mid) = @_; my $self_ng = $self->{ng}; if ($self_ng) { my $n = $self_ng->mm->num_for($mid); return ($self_ng, $n) if defined $n; } foreach my $ng (values %{$self->{nntpd}->{groups}}) { next if defined $self_ng && $ng eq $self_ng; my $n = $ng->mm->num_for($mid); return ($ng, $n) if defined $n; } (undef, undef); } sub xref_range_i { my ($self, $beg, $end) = @_; my $ng = $self->{ng}; my $r = $ng->mm->msg_range($beg, $end); @$r or return; more($self, join("\r\n", map { my $num = $_->[0]; "$num ".xref($self, $ng, $num, $_->[1]); } @$r)); 1; } sub hdr_xref ($$$) { # optimize XHDR Xref [range] for rtin my ($self, $xhdr, $range) = @_; if (defined $range && $range =~ $ONE_MSGID) { my $mid = $1; my ($ng, $n) = mid_lookup($self, $mid); return r430 unless $n; hdr_mid_response($self, $xhdr, $ng, $n, $range, xref($self, $ng, $n, $mid)); } else { # numeric range $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; more($self, $xhdr ? r221 : r225); long_response($self, \&xref_range_i, @$r); } } sub over_header_for { my ($over, $num, $field) = @_; my $smsg = $over->get_art($num) or return; return PublicInbox::Smsg::date($smsg) if $field eq 'date'; $smsg->{$field}; } sub smsg_range_i { my ($self, $beg, $end, $field) = @_; my $over = $self->{ng}->over; my $msgs = $over->query_xover($$beg, $end); scalar(@$msgs) or return; my $tmp = ''; foreach my $s (@$msgs) { $tmp .= $s->{num} . ' ' . $s->$field . "\r\n"; } utf8::encode($tmp); $self->msg_more($tmp); $$beg = $msgs->[-1]->{num} + 1; } sub hdr_smsg ($$$$) { my ($self, $xhdr, $field, $range) = @_; if (defined $range && $range =~ $ONE_MSGID) { my ($ng, $n) = mid_lookup($self, $1); return r430 unless defined $n; my $v = over_header_for($ng->over, $n, $field); hdr_mid_response($self, $xhdr, $ng, $n, $range, $v); } else { # numeric range $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; more($self, $xhdr ? r221 : r225); long_response($self, \&smsg_range_i, @$r, $field); } } sub do_hdr ($$$;$) { my ($self, $xhdr, $header, $range) = @_; my $sub = lc $header; if ($sub eq 'message-id') { hdr_message_id($self, $xhdr, $range); } elsif ($sub eq 'xref') { hdr_xref($self, $xhdr, $range); } elsif ($sub =~ /\A(?:subject|references|date|from|to|cc| bytes|lines)\z/x) { hdr_smsg($self, $xhdr, $sub, $range); } elsif ($sub =~ /\A:(bytes|lines)\z/) { hdr_smsg($self, $xhdr, $1, $range); } else { $xhdr ? (r221 . "\r\n.") : "503 HDR not permitted on $header"; } } # RFC 3977 sub cmd_hdr ($$;$) { my ($self, $header, $range) = @_; do_hdr($self, 0, $header, $range); } # RFC 2980 sub cmd_xhdr ($$;$) { my ($self, $header, $range) = @_; do_hdr($self, 1, $header, $range); } sub hdr_mid_prefix ($$$$$) { my ($self, $xhdr, $ng, $n, $mid) = @_; return $mid if $xhdr; # HDR for RFC 3977 users if (my $self_ng = $self->{ng}) { ($self_ng eq $ng) ? $n : '0'; } else { '0'; } } sub hdr_mid_response ($$$$$$) { my ($self, $xhdr, $ng, $n, $mid, $v) = @_; my $res = ''; if ($xhdr) { $res .= r221 . "\r\n"; $res .= "$mid $v\r\n"; } else { $res .= r225 . "\r\n"; my $pfx = hdr_mid_prefix($self, $xhdr, $ng, $n, $mid); $res .= "$pfx $v\r\n"; } res($self, $res .= '.'); undef; } sub xrover_i { my ($self, $beg, $end) = @_; my $h = over_header_for($self->{ng}->over, $$beg, 'references'); more($self, "$$beg $h") if defined($h); $$beg++ < $end; } sub cmd_xrover ($;$) { my ($self, $range) = @_; my $ng = $self->{ng} or return '412 no newsgroup selected'; (defined $range && $range =~ /[<>]/) and return '420 No article(s) selected'; # no message IDs $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; more($self, '224 Overview information follows'); long_response($self, \&xrover_i, @$r); } sub over_line ($$$$) { my ($self, $ng, $num, $smsg) = @_; # n.b. field access and procedural calls can be # 10%-15% faster than OO method calls: my $s = join("\t", $num, $smsg->{subject}, $smsg->{from}, PublicInbox::Smsg::date($smsg), "<$smsg->{mid}>", $smsg->{references}, $smsg->{bytes}, $smsg->{lines}, "Xref: " . xref($self, $ng, $num, $smsg->{mid})); utf8::encode($s); $s } sub cmd_over ($;$) { my ($self, $range) = @_; if ($range && $range =~ $ONE_MSGID) { my ($ng, $n) = mid_lookup($self, $1); defined $n or return r430; my $smsg = $ng->over->get_art($n) or return r430; more($self, '224 Overview information follows (multi-line)'); # Only set article number column if it's the current group my $self_ng = $self->{ng}; $n = 0 if (!$self_ng || $self_ng ne $ng); more($self, over_line($self, $ng, $n, $smsg)); '.'; } else { cmd_xover($self, $range); } } sub xover_i { my ($self, $beg, $end) = @_; my $ng = $self->{ng}; my $msgs = $ng->over->query_xover($$beg, $end); my $nr = scalar @$msgs or return; # OVERVIEW.FMT more($self, join("\r\n", map { over_line($self, $ng, $_->{num}, $_); } @$msgs)); $$beg = $msgs->[-1]->{num} + 1; } sub cmd_xover ($;$) { my ($self, $range) = @_; $range = $self->{article} unless defined $range; my $r = get_range($self, $range); return $r unless ref $r; my ($beg, $end) = @$r; more($self, "224 Overview information follows for $$beg to $end"); long_response($self, \&xover_i, @$r); } sub compressed { undef } sub cmd_starttls ($) { my ($self) = @_; my $sock = $self->{sock} or return; # RFC 4642 2.2.1 return r502 if (ref($sock) eq 'IO::Socket::SSL' || $self->compressed); my $opt = $self->{nntpd}->{accept_tls} or return '580 can not initiate TLS negotiation'; res($self, '382 Continue with TLS negotiation'); $self->{sock} = IO::Socket::SSL->start_SSL($sock, %$opt); $self->requeue if PublicInbox::DS::accept_tls_step($self); undef; } # RFC 8054 sub cmd_compress ($$) { my ($self, $alg) = @_; return '503 Only DEFLATE is supported' if uc($alg) ne 'DEFLATE'; return r502 if $self->compressed || !$have_deflate; PublicInbox::NNTPdeflate->enable($self); $self->requeue; undef } sub zflush {} # overridden by NNTPdeflate sub cmd_xpath ($$) { my ($self, $mid) = @_; return r501 unless $mid =~ $ONE_MSGID; $mid = $1; my @paths; foreach my $ng (values %{$self->{nntpd}->{groups}}) { my $n = $ng->mm->num_for($mid); push @paths, "$ng->{newsgroup}/$n" if defined $n; } return '430 no such article on server' unless @paths; '223 '.join(' ', @paths); } sub res ($$) { do_write($_[0], $_[1] . "\r\n") } sub more ($$) { $_[0]->msg_more($_[1] . "\r\n") } sub do_write ($$) { my $self = $_[0]; my $done = $self->write(\($_[1])); return 0 unless $self->{sock}; $done; } sub err ($$;@) { my ($self, $fmt, @args) = @_; printf { $self->{nntpd}->{err} } $fmt."\n", @args; } sub out ($$;@) { my ($self, $fmt, @args) = @_; printf { $self->{nntpd}->{out} } $fmt."\n", @args; } # callback used by PublicInbox::DS for any (e)poll (in/out/hup/err) sub event_step { my ($self) = @_; return unless $self->flush_write && $self->{sock}; $self->update_idle_time; # only read more requests if we've drained the write buffer, # otherwise we can be buffering infinitely w/o backpressure my $rbuf = $self->{rbuf} // (\(my $x = '')); my $r = 1; if (index($$rbuf, "\n") < 0) { my $off = bytes::length($$rbuf); $r = $self->do_read($rbuf, LINE_MAX, $off) or return; } while ($r > 0 && $$rbuf =~ s/\A[ \t]*([^\n]*?)\r?\n//) { my $line = $1; return $self->close if $line =~ /[[:cntrl:]]/s; my $t0 = now(); my $fd = fileno($self->{sock}); $r = eval { process_line($self, $line) }; my $pending = $self->{wbuf} ? ' pending' : ''; out($self, "[$fd] %s - %0.6f$pending", $line, now() - $t0); } return $self->close if $r < 0; my $len = bytes::length($$rbuf); return $self->close if ($len >= LINE_MAX); $self->rbuf_idle($rbuf); $self->update_idle_time; # maybe there's more pipelined data, or we'll have # to register it for socket-readiness notifications $self->requeue unless $self->{wbuf}; } # for graceful shutdown in PublicInbox::Daemon: sub busy { my ($self, $now) = @_; ($self->{rbuf} || $self->{wbuf} || $self->not_idle_long($now)); } # this is an import to prevent "perl -c" from complaining about fields sub import { $have_deflate = eval { require PublicInbox::NNTPdeflate } and $CAPABILITIES .= "COMPRESS DEFLATE\r\n"; } 1;