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authorDaniel Stenberg <daniel@haxx.se>2010-05-14 22:34:10 +0200
committerDaniel Stenberg <daniel@haxx.se>2010-05-14 22:35:08 +0200
commit77cfeadfa6405c5808273f1d3cc8e89eb17e5f08 (patch)
tree17334b90cd9a519fbb24ec642b62aee2cec40d68 /docs/examples/sendrecv.c
parentea521cf6173a8140d2d8e22e8e4e2ecd9683d7a4 (diff)
OpenSSL: multi interface handshake could hang
John-Mark Bell filed bug #3000052 that identified a problem (with an associated patch) with the OpenSSL handshake state machine when the multi interface is used: Performing an https request using a curl multi handle and using select or epoll to wait for events results in a hang. It appears that the cause is the fix for bug #2958179, which makes ossl_connect_common unconditionally return from the step 2 loop when fetching from a multi handle. When ossl_connect_step2 has completed, it updates connssl->connecting_state to ssl_connect_3. ossl_connect_common will then return to the caller, as a multi handle is in use. Eventually, the client code will call curl_multi_fdset to obtain an updated fdset to select or epoll on. For https requests, curl_multi_fdset will cause https_getsock to be called. https_getsock will only return a socket handle if the connecting_state is ssl_connect_2_reading or ssl_connect_2_writing. Therefore, the client will never obtain a valid fdset, and thus not drive the multi handle, resulting in a hang. (http://curl.haxx.se/bug/view.cgi?id=3000052)
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