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This patch introduce the "dns_stream_nameserver" to use DNS over TCP on strict nameservers. For the upper layer it is analog to the api used with udp nameservers except that the user que switch the name server in "stream" mode at the init using "dns_stream_init". The fallback from UDP to TCP is not handled and this is not the purpose of this feature. This is done to choose the transport layer during the initialization. Currently there is a hardcoded limit of 4 pipelined transactions per TCP connections. A batch of idle connections is expired every 5s. This code is designed to support a maximum DNS message size on TCP: 64k. Note: this code won't perform retry on unanswered queries this should be handled by the upper layer
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)