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| author | Tom Gundersen <teg@jklm.no> | 2015-06-23 23:06:09 +0200 |
|---|---|---|
| committer | Tom Gundersen <teg@jklm.no> | 2015-11-27 01:35:34 +0100 |
| commit | 9c5e12a4314e7192e834e1b855e5e80111e636a6 (patch) | |
| tree | fc82c7ab5220ad0847ed439b44946528a327d50b /src/resolve/resolved-dns-server.c | |
| parent | dc913c9a1f243bca291d47b1a5d8e270c471d113 (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).
Diffstat (limited to 'src/resolve/resolved-dns-server.c')
| -rw-r--r-- | src/resolve/resolved-dns-server.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-server.c b/src/resolve/resolved-dns-server.c index c5396a03c8..f8c921e4c8 100644 --- a/src/resolve/resolved-dns-server.c +++ b/src/resolve/resolved-dns-server.c @@ -478,5 +478,6 @@ void manager_next_dns_server(Manager *m) { static const char* const dns_server_feature_level_table[_DNS_SERVER_FEATURE_LEVEL_MAX] = { [DNS_SERVER_FEATURE_LEVEL_TCP] = "TCP", [DNS_SERVER_FEATURE_LEVEL_UDP] = "UDP", + [DNS_SERVER_FEATURE_LEVEL_EDNS0] = "UDP+EDNS0", }; DEFINE_STRING_TABLE_LOOKUP(dns_server_feature_level, DnsServerFeatureLevel); |