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From: Eric Wong <e@80x24.org>
To: meta@public-inbox.org
Subject: [PATCH] tls: epollbit: account for miscellaneous OpenSSL errors
Date: Fri, 30 Oct 2020 02:13:58 +0000
Message-Id: <20201030021358.25539-1-e@80x24.org>
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List-Id: <meta.public-inbox.org>

Apparently they happen (triggered by my -imapd instance), so
bail out by closing the underlying socket rather than stopping
the event loop and daemon process.
---
 lib/PublicInbox/DS.pm   | 15 ++++++++++-----
 lib/PublicInbox/HTTP.pm |  2 +-
 lib/PublicInbox/IMAP.pm |  2 +-
 lib/PublicInbox/NNTP.pm |  2 +-
 lib/PublicInbox/TLS.pm  |  4 +++-
 5 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index d0caa5e7..a02b3bb7 100644
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -433,7 +433,8 @@ next_buf:
                         goto next_buf;
                     }
                 } elsif ($! == EAGAIN) {
-                    epwait($sock, epbit($sock, EPOLLOUT) | EPOLLONESHOT);
+                    my $ev = epbit($sock, EPOLLOUT) or return $self->close;
+                    epwait($sock, $ev | EPOLLONESHOT);
                     return 0;
                 } else {
                     return $self->close;
@@ -469,7 +470,8 @@ sub do_read ($$$;$) {
     # common for clients to break connections without warning,
     # would be too noisy to log here:
     if ($! == EAGAIN) {
-        epwait($sock, epbit($sock, EPOLLIN) | EPOLLONESHOT);
+        my $ev = epbit($sock, EPOLLIN) or return $self->close;
+        epwait($sock, $ev | EPOLLONESHOT);
         rbuf_idle($self, $rbuf);
         0;
     } else {
@@ -543,7 +545,8 @@ sub write {
             return 1 if $written == $to_write;
             requeue($self); # runs: event_step -> flush_write
         } elsif ($! == EAGAIN) {
-            epwait($sock, epbit($sock, EPOLLOUT) | EPOLLONESHOT);
+            my $ev = epbit($sock, EPOLLOUT) or return $self->close;
+            epwait($sock, $ev | EPOLLONESHOT);
             $written = 0;
         } else {
             return $self->close;
@@ -596,7 +599,8 @@ sub accept_tls_step ($) {
     my $sock = $self->{sock} or return;
     return 1 if $sock->accept_SSL;
     return $self->close if $! != EAGAIN;
-    epwait($sock, PublicInbox::TLS::epollbit() | EPOLLONESHOT);
+    my $ev = PublicInbox::TLS::epollbit() or return $self->close;
+    epwait($sock, $ev | EPOLLONESHOT);
     unshift(@{$self->{wbuf}}, \&accept_tls_step); # autovivifies
     0;
 }
@@ -607,7 +611,8 @@ sub shutdn_tls_step ($) {
     my $sock = $self->{sock} or return;
     return $self->close if $sock->stop_SSL(SSL_fast_shutdown => 1);
     return $self->close if $! != EAGAIN;
-    epwait($sock, PublicInbox::TLS::epollbit() | EPOLLONESHOT);
+    my $ev = PublicInbox::TLS::epollbit() or return $self->close;
+    epwait($sock, $ev | EPOLLONESHOT);
     unshift(@{$self->{wbuf}}, \&shutdn_tls_step); # autovivifies
     0;
 }
diff --git a/lib/PublicInbox/HTTP.pm b/lib/PublicInbox/HTTP.pm
index 5844ef44..88020ae8 100644
--- a/lib/PublicInbox/HTTP.pm
+++ b/lib/PublicInbox/HTTP.pm
@@ -70,7 +70,7 @@ sub new ($$$) {
 	my $wbuf;
 	if ($sock->can('accept_SSL') && !$sock->accept_SSL) {
 		return CORE::close($sock) if $! != EAGAIN;
-		$ev = PublicInbox::TLS::epollbit();
+		$ev = PublicInbox::TLS::epollbit() or return CORE::close($sock);
 		$wbuf = [ \&PublicInbox::DS::accept_tls_step ];
 	}
 	$self->{wbuf} = $wbuf if $wbuf;
diff --git a/lib/PublicInbox/IMAP.pm b/lib/PublicInbox/IMAP.pm
index 37001da4..9599f494 100644
--- a/lib/PublicInbox/IMAP.pm
+++ b/lib/PublicInbox/IMAP.pm
@@ -115,7 +115,7 @@ sub new ($$$) {
 	my $wbuf;
 	if ($sock->can('accept_SSL') && !$sock->accept_SSL) {
 		return CORE::close($sock) if $! != EAGAIN;
-		$ev = PublicInbox::TLS::epollbit();
+		$ev = PublicInbox::TLS::epollbit() or return CORE::close($sock);
 		$wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
 	}
 	$self->SUPER::new($sock, $ev | EPOLLONESHOT);
diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 88fe2bb0..102ef42c 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -53,7 +53,7 @@ sub new ($$$) {
 	my $wbuf;
 	if ($sock->can('accept_SSL') && !$sock->accept_SSL) {
 		return CORE::close($sock) if $! != EAGAIN;
-		$ev = PublicInbox::TLS::epollbit();
+		$ev = PublicInbox::TLS::epollbit() or return CORE::close($sock);
 		$wbuf = [ \&PublicInbox::DS::accept_tls_step, \&greet ];
 	}
 	$self->SUPER::new($sock, $ev | EPOLLONESHOT);
diff --git a/lib/PublicInbox/TLS.pm b/lib/PublicInbox/TLS.pm
index 0f838e25..86e6331d 100644
--- a/lib/PublicInbox/TLS.pm
+++ b/lib/PublicInbox/TLS.pm
@@ -6,6 +6,7 @@ package PublicInbox::TLS;
 use strict;
 use IO::Socket::SSL;
 use PublicInbox::Syscall qw(EPOLLIN EPOLLOUT);
+use Carp qw(carp);
 
 sub err () { $SSL_ERROR }
 
@@ -13,7 +14,8 @@ sub err () { $SSL_ERROR }
 sub epollbit () {
 	return EPOLLIN if $SSL_ERROR == SSL_WANT_READ;
 	return EPOLLOUT if $SSL_ERROR == SSL_WANT_WRITE;
-	die "unexpected SSL error: $SSL_ERROR";
+	carp "unexpected SSL error: $SSL_ERROR";
+	undef;
 }
 
 1;