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Re: [PATCH] GnuTLS: make the connection phase non-blocking

From: Daniel Stenberg <>
Date: Fri, 16 Apr 2010 15:41:32 +0200 (CEST)

On Thu, 15 Apr 2010, Jerome Vouillon wrote:

> This patch improves the GnuTLS back-end to make the SSL connection phase
> non-blocking when the multi interface is used.

GREAT! Many thanks for this improvement. When trying it out, I noticed that
our tests all failed when we built with GnuTLS which made suspect you didn't
try the test suite yet? I fixed that particular problem, but now with your
patch applied I get this:

$ ./src/curl -V
curl 7.20.2-DEV (i686-pc-linux-gnu) libcurl/7.20.2-DEV GnuTLS/2.8.5
zlib/ libidn/1.15
Protocols: dict file ftp ftps http https imap imaps ldap pop3 pop3s rtsp smtp
smtps telnet tftp
Features: Debug TrackMemory IDN IPv6 Largefile NTLM SSL libz

$ cd tests
$ ./runtests -g 305
15:37:10.757304 * Connected to ( port 8991 (#0)
15:37:10.757624 * error reading ca cert file moooo (Error while reading file.)

Program received signal SIGSEGV, Segmentation fault.
0xb7ecc7fd in gnutls_handshake () from /usr/lib/
(gdb) bt
#0 0xb7ecc7fd in gnutls_handshake () from /usr/lib/
#1 0x080839c5 in handshake (conn=0x80c737c, sockindex=0, duringconnect=true,
     nonblocking=false) at gtls.c:238
#2 0x08084850 in gtls_connect_common (conn=0x80c737c, sockindex=0,
     nonblocking=false, done=0xbfffe42b) at gtls.c:688
#3 0x080848f3 in Curl_gtls_connect (conn=0x80c737c, sockindex=0) at
#4 0x080638c8 in Curl_ssl_connect (conn=0x80c737c, sockindex=0)
     at sslgen.c:194
#5 0x0806b0bb in Curl_http_connect (conn=0x80c737c, done=0xbfffe56a)
     at http.c:1779
#6 0x08074acf in Curl_protocol_connect (conn=0x80c737c,
     protocol_done=0xbfffe56a) at url.c:3281
#7 0x08077381 in setup_conn (conn=0x80c737c, protocol_done=0xbfffe56a)
     at url.c:4963
#8 0x080774dc in Curl_connect (data=0x80bde5c, in_connect=0xbfffe5a4,
     asyncp=0xbfffe56b, protocol_done=0xbfffe56a) at url.c:5036
#9 0x0807e8fb in connect_host (data=0x80bde5c, conn=0xbfffe5a4)
     at transfer.c:1900
#10 0x0807eb9d in Curl_perform (data=0x80bde5c) at transfer.c:2039
#11 0x0805b972 in curl_easy_perform (curl=0x80bde5c) at easy.c:556
#12 0x08054109 in operate (config=0xbfffe9f0, argc=9, argv=0xbfffec54)
     at main.c:5197
#13 0x08054a2d in main (argc=9, argv=0xbfffec54) at main.c:5522
(gdb) fr 1
#1 0x080839c5 in handshake (conn=0x80c737c, sockindex=0, duringconnect=true,
     nonblocking=false) at gtls.c:238
238 rc = gnutls_handshake(session);
(gdb) list
233 }
234 }
235 /* socket is readable or writable */
236 }
238 rc = gnutls_handshake(session);
240 if((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED)) {
241 connssl->connecting_state =
242 gnutls_record_get_direction(session)?
(gdb) p session
$1 = (gnutls_session_t) 0x0

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Received on 2010-04-16