dnscache-0.1.0 is not a library.
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dnscache-0.3.2
Dnscache
Simple DNS proxy supporting one upstream. Designed for using slow and unreliable upstream DNS servers like Tor's DNS resolver. Trades consistency for availability. Not for serious use.
License = MIT or Apache 2.0
dnscache 0.1.0
Vitaly _Vi Shukela <vi0oss@gmail.com>
Simple DNS cacher.
USAGE:
dnscache [OPTIONS] <listen_addr> <upstream_addr> <db>
FLAGS:
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
--neg-ttl <neg_ttl> Negative reply TTL, seconds [default: 30]
ARGS:
<listen_addr> Listen address and port
<upstream_addr> Upstream DNS server address and port
<db> Path to LevelDB database directory
Features:
- IPv6 AAAA records
- Forwarding of trickier queries as is
- Multi-question queries
- Minimal protection from poisoning by filtering domain names in replies
- Always tries to immediately return some A or AAAA records for client to try, no waiting for refreshing.
Notes:
- It does not construct DNS requests on its own, it reuses client-constructed packets
- Uncached queries (non-A, non-AAAA or non-IN) are forwarded based in ID
- TTL may be 0 in replies
- Single threaded, single UDP socket
Concerns:
- ID field is handled inconsistently
- Entries are never deleted from cache
- If data is stale, it first replies with TTL 0, then re-checks in upstream
- The used LevelDB implementation is not recommended for serious use yet.
- The same socket used both for client and for upstream communication. Can't listen only on 127.0.0.1, but rely on 8.8.8.8.