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resolved: set io events after receiving EAGAIN for TLS

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During handshake and TLS session closing, messages needs to be exchanged. Therefore this patch overrides the requested IO events for the TCP stream when the TLS is waiting for sending or receiving of messages during theses periods. This fixes issues with correctly closing the TLS stream and prevents the handshake from hanging in rare cases (not seen yet).
This commit is contained in:
Iwan Timmer 2018-07-26 20:34:16 +01:00
parent 6016fcb0ea
commit ba6aaf5727
3 changed files with 25 additions and 6 deletions
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17
src/resolve/resolved-dns-stream.c
View File

@ -36,6 +36,12 @@ static int dns_stream_update_io(DnsStream *s) {
if (!s->read_packet || s->n_read < sizeof(s->read_size) + s->read_packet->size)
f |= EPOLLIN;
#if ENABLE_DNS_OVER_TLS
/* For handshake and clean closing purposes, TLS can override requested events */
if (s->dnstls_events)
f = s->dnstls_events;
#endif
return sd_event_source_set_io_events(s->io_event_source, f);
}
@ -274,10 +280,17 @@ static int on_stream_io(sd_event_source *es, int fd, uint32_t revents, void *use
if (s->encrypted) {
r = dnstls_stream_on_io(s);
if (r == DNSTLS_STREAM_CLOSED || r == -EAGAIN)
if (r == DNSTLS_STREAM_CLOSED)
return 0;
else if (r < 0)
else if (r == -EAGAIN)
return dns_stream_update_io(s);
else if (r < 0) {
return dns_stream_complete(s, -r);
} else {
r = dns_stream_update_io(s);
if (r < 0)
return r;
}
}
#endif

1
src/resolve/resolved-dns-stream.h
View File

@ -42,6 +42,7 @@ struct DnsStream {
#if ENABLE_DNS_OVER_TLS
DnsTlsStreamData dnstls_data;
int dnstls_events;
#endif
sd_event_source *io_event_source;

13
src/resolve/resolved-dnstls-gnutls.c
View File

@ -86,23 +86,28 @@ int dnstls_stream_on_io(DnsStream *stream) {
if (stream->dnstls_data.shutdown) {
r = gnutls_bye(stream->dnstls_data.session, GNUTLS_SHUT_RDWR);
if (r == GNUTLS_E_AGAIN)
if (r == GNUTLS_E_AGAIN) {
stream->dnstls_events = gnutls_record_get_direction(stream->dnstls_data.session) == 1 ? EPOLLOUT : EPOLLIN;
return -EAGAIN;
else if (r < 0)
} else if (r < 0)
log_debug("Failed to invoke gnutls_bye: %s", gnutls_strerror(r));
stream->dnstls_events = 0;
stream->dnstls_data.shutdown = false;
dns_stream_unref(stream);
return DNSTLS_STREAM_CLOSED;
} else if (stream->dnstls_data.handshake < 0) {
stream->dnstls_data.handshake = gnutls_handshake(stream->dnstls_data.session);
if (stream->dnstls_data.handshake == GNUTLS_E_AGAIN)
if (stream->dnstls_data.handshake == GNUTLS_E_AGAIN) {
stream->dnstls_events = gnutls_record_get_direction(stream->dnstls_data.session) == 1 ? EPOLLOUT : EPOLLIN;
return -EAGAIN;
else if (stream->dnstls_data.handshake < 0) {
} else if (stream->dnstls_data.handshake < 0) {
log_debug("Failed to invoke gnutls_handshake: %s", gnutls_strerror(stream->dnstls_data.handshake));
if (gnutls_error_is_fatal(stream->dnstls_data.handshake))
return -ECONNREFUSED;
}
stream->dnstls_events = 0;
}
return 0;