nntp: add support for CAPABILITIES command

Some clients may rely on this for STARTTLS support.

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 57a67a50ff8475f1882a4aa6a90aa2e477c1d4cc..d106e3158e32f73396c33585bbebf9772849456e 100644 (file)
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -31,6 +31,14 @@ my @OVERVIEW = qw(Subject From Date Message-ID References Xref);
 my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines)) . ":\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 $EXPMAP; # fd -> [ idle_time, $self ]
 my $expt;
@@ -121,6 +129,17 @@ sub process_line ($$) {
        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;

diff --git a/t/nntpd-tls.t b/t/nntpd-tls.t
index 82b63f3e443cee55820b614cf7442a94b4655600..4cf53daad8cd0325fdb7e9555ab56bc7a19906d4 100644 (file)
--- a/t/nntpd-tls.t
+++ b/t/nntpd-tls.t
@@ -128,6 +128,8 @@ for my $args (
        my $c = Net::NNTP->new($nntps_addr, %o, SSL => 1);
        my $list = $c->list;
        is_deeply($list, $expect, 'NNTPS LIST works');
+       unlike(get_capa($c), qr/\bSTARTTLS\r\n/,
+               'STARTTLS not advertised for NNTPS');
        is($c->command('QUIT')->response(), Net::Cmd::CMD_OK(), 'QUIT works');
        is(0, sysread($c, my $buf, 1), 'got EOF after QUIT');
 
@@ -139,6 +141,8 @@ for my $args (
        is($c->code, 382, 'got 382 for STARTTLS');
        $list = $c->list;
        is_deeply($list, $expect, 'LIST works after STARTTLS');
+       unlike(get_capa($c), qr/\bSTARTTLS\r\n/,
+               'STARTTLS not advertised after STARTTLS');
 
        # Net::NNTP won't let us do dumb things, but we need to test
        # dumb things, so use Net::Cmd directly:
@@ -149,6 +153,7 @@ for my $args (
        # STARTTLS with bad hostname
        $o{SSL_hostname} = $o{SSL_verifycn_name} = 'server.invalid';
        $c = Net::NNTP->new($starttls_addr, %o);
+       like(get_capa($c), qr/\bSTARTTLS\r\n/, 'STARTTLS advertised');
        $list = $c->list;
        is_deeply($list, $expect, 'plain LIST works again');
        ok(!$c->starttls, 'STARTTLS fails with bad hostname');
@@ -217,4 +222,17 @@ for my $args (
        }
 }
 done_testing();
+
+sub get_capa {
+       my ($sock) = @_;
+       syswrite($sock, "CAPABILITIES\r\n");
+       my $capa = '';
+       do {
+               my $r = sysread($sock, $capa, 8192, length($capa));
+               die "unexpected: $!" unless defined($r);
+               die 'unexpected EOF' if $r == 0;
+       } until $capa =~ /\.\r\n\z/;
+       $capa;
+}
+
 1;

diff --git a/t/nntpd.t b/t/nntpd.t
index 0e59de07ed5315166557258bcdf804469d2d50d6..1c5ae8d7a5beaf0858620b7fc4d09655ba8b6624 100644 (file)
--- a/t/nntpd.t
+++ b/t/nntpd.t
@@ -143,6 +143,11 @@ EOF
                'got greeting');
        $s->autoflush(1);
 
+       syswrite($s, "CAPABILITIES\r\n");
+       $buf = read_til_dot($s);
+       like($buf, qr/\r\nVERSION 2\r\n/s, 'CAPABILITIES works');
+       unlike($buf, qr/STARTTLS/s, 'STARTTLS not advertised');
+
        syswrite($s, "NEWGROUPS 19990424 000000 GMT\r\n");
        $buf = read_til_dot($s);
        like($buf, qr/\A231 list of /, 'newgroups OK');