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authorTom Gundersen <teg@jklm.no>2015-06-23 23:06:09 +0200
committerTom Gundersen <teg@jklm.no>2015-11-27 01:35:34 +0100
commit9c5e12a4314e7192e834e1b855e5e80111e636a6 (patch)
treefc82c7ab5220ad0847ed439b44946528a327d50b /.mailmap
parentdc913c9a1f243bca291d47b1a5d8e270c471d113 (diff)
resolved: implement minimal EDNS0 support
This is a minimal implementation of RFC6891. Only default values are used, so in reality this will be a noop. EDNS0 support is dependent on the current server's feature level, so appending the OPT pseudo RR is done when the packet is emitted, rather than when it is assembled. To handle different feature levels on retransmission, we strip off the OPT RR again after sending the packet. Similarly, to how we fall back to TCP if UDP fails, we fall back to plain UDP if EDNS0 fails (but if EDNS0 ever succeeded we never fall back again, and after a timeout we will retry EDNS0).
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