Review Request 31207: WIP: Support for SSL and non-ssl traffic simultaneously.

[Joris Van Remoortere <jo...@gmail.com>]

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Review request for mesos, Benjamin Hindman and Niklas Nielsen.


Bugs: MESOS-2085
    https://issues.apache.org/jira/browse/MESOS-2085


Repository: mesos


Description
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Add a flag SSL_SUPPORT_DOWNGRADE which allows:
1. an SSL accepting socket to peek at the incoming data. If the hello handshake bits are not set, then accept as a Socket::POLL socket instead.
2. When calling Process::link or Process:send(Message), if a new connection is required, allow a second attempt using Socket::POLL if an SSL connection was first attempted.


Diffs
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  3rdparty/libprocess/include/process/socket.hpp ddb9e365fc1e65a568bdac4973964df1ab8cc05e 
  3rdparty/libprocess/src/libevent_ssl_socket.cpp PRE-CREATION 
  3rdparty/libprocess/src/openssl.hpp PRE-CREATION 
  3rdparty/libprocess/src/openssl.cpp PRE-CREATION 
  3rdparty/libprocess/src/poll_socket.hpp f7ca08e04f0e2a6c4436579b8e18881376985aa5 
  3rdparty/libprocess/src/process.cpp 67b6b3b9c13d95fa1a24b48a12c5c831c7f249bf 

Diff: https://reviews.apache.org/r/31207/diff/


Testing
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Running with:
1) An SSL master
  - connect a non-ssl slave
  - connect a non-ssl framework
  - connect an ssl slave
  - connect an ssl framework
2) A non-ssl master
  - connect a non-ssl slave
  - connect a non-ssl framework
  - connect an ssl slave
  - connect an ssl framework


Thanks,

Joris Van Remoortere