Yeah, I tried a 0 len read. Unfortunately, the core input filter is not happy
about that:
core_filters.c, line 231
AP_DEBUG_ASSERT(readbytes > 0);
> Am 12.10.2015 um 10:25 schrieb Plüm, Rüdiger, Vodafone Group
> <ruediger.pl...@vodafone.com>:
>
> How about the following patch?
>
> This separates the triggering of the SSL Handshake and the possible reading
> of the 24 bytes:
>
> Index: h2_h2.c
> ===================================================================
> --- h2_h2.c (revision 1707437)
> +++ h2_h2.c (working copy)
> @@ -154,7 +154,7 @@
>
> temp = apr_brigade_create(c->pool, c->bucket_alloc);
> status = ap_get_brigade(c->input_filters, temp,
> - AP_MODE_SPECULATIVE, APR_BLOCK_READ, 24);
> + AP_MODE_INIT, APR_BLOCK_READ, 0);
>
> if (status == APR_SUCCESS) {
> if (h2_ctx_protocol_get(c)
> @@ -171,23 +171,31 @@
> char *s = NULL;
> apr_size_t slen;
>
> - apr_brigade_pflatten(temp, &s, &slen, c->pool);
> - if ((slen >= 24) && !memcmp(H2_MAGIC_TOKEN, s, 24)) {
> - ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
> - "h2_h2, direct mode detected");
> - h2_ctx_protocol_set(ctx, is_tls? "h2" : "h2c");
> + status = ap_get_brigade(c->input_filters, temp,
> + AP_MODE_SPECULATIVE,
> APR_BLOCK_READ, 24);
> + if (status == APR_SUCCESS) {
> + apr_brigade_pflatten(temp, &s, &slen, c->pool);
> + if ((slen >= 24) && !memcmp(H2_MAGIC_TOKEN, s, 24)) {
> + ap_log_cerror(APLOG_MARK, APLOG_TRACE1, 0, c,
> + "h2_h2, direct mode detected");
> + h2_ctx_protocol_set(ctx, is_tls? "h2" : "h2c");
> + }
> + else {
> + ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
> + "h2_h2, not detected in %d bytes:
> %s",
> + (int)slen, s);
> + }
> }
> - else {
> - ap_log_cerror(APLOG_MARK, APLOG_TRACE2, 0, c,
> - "h2_h2, not detected in %d bytes: %s",
> - (int)slen, s);
> - }
> }
> + else {
> + ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, c,
> + "h2_h2, error reading 24 bytes
> speculative");
> + }
> }
> }
> else {
> ap_log_cerror(APLOG_MARK, APLOG_DEBUG, status, c,
> - "h2_h2, error reading 24 bytes speculative");
> + "h2_h2, Failed to init connection");
> }
> apr_brigade_destroy(temp);
> }
>
> This would still block in the non ssl case if directmode is not set to off
> explicitly. I would propose to change the default behaviour of directmode
> here to off as directmode seems to be something very special to me that
> should be explicitly enabled.
>
> Regards
>
> Rüdiger
>
>> -----Original Message-----
>> From: Stefan Eissing [mailto:stefan.eiss...@greenbytes.de]
>> Sent: Sonntag, 11. Oktober 2015 19:54
>> To: dev@httpd.apache.org
>> Subject: Re: 2.4.17 test failure for mod_nntp_like_ssl when mod_http2 is
>> loaded
>>
>> Ok, in ssl_engine_io.c, lines 1426+ I see a hint:
>>
>> /* XXX: we could actually move ssl_io_filter_handshake to an
>> * ap_hook_process_connection but would still need to call it for
>> * AP_MODE_INIT for protocols that may upgrade the connection
>> * rather than have SSLEngine On configured.
>> */
>> if ((status = ssl_io_filter_handshake(inctx->filter_ctx)) !=
>> APR_SUCCESS) {
>> return ssl_io_filter_error(f, bb, status);
>> }
>>
>> The handshake handling gets triggered on a filter, so it all happens on
>> READs (or WRITEs), which explains why connection hooks do not see it. This
>> is quite some code which looks like we do not want to touch for a "quick
>> fix". Also, there is no quick fix inside mod_http2 as before handshake,
>> the SNI might also not be there yet, thus the vhost cannot be determined.
>> etc.
>>
>> For the current release, I think we should leave it as it is and advise
>> that current mod_http2 is incompatible with things like nntp.
>>
>> For the next release, I'd like the server to perform the handshake at a
>> defined time, so other modules can rely on protocols being selected and
>> correct vhost being known before the first read/write.
>>
>> //Stefan
>>
