Removes the 128 kB limit for files making up the database.
We used to skip over and complain about files that exceeded
the limit, forcing the user to generate hash files.
This caused things to inexplicably stop working after a file
hit the hidden limit, which is unreasonable behaviour considering
that libndb happily, albeit slowly, works with bigger files.
to reproduce:
ipnet=foo0 ip=192.168.0.0 ipmask=/16
ipnet=foo1 ip=192.168.0.0 ipmask=/24
ip=192.168.0.1 sys=foo2
% ndb/ipquery sys foo2 ipnet ipmask
ipnet=foo0 ipmask=/16
we would expect to get ipnet=foo1 here as it is more
specific subnet.
the solution is to order the subnets by prefix length
in subnet() before calling filter(), so that we process
the longest prefixes first.
the dnsquery() library function should not start mouting /srv/dns on
its own. this problem arrises only for ndb/cs as it is started before
ndb/dns.
the issue with mounting /srv/dns before /net is when ndb/cs attempts
to read the list of interfaces, accessing /net/ipifc, which triggers
a rpc to ndb/dns as it is ontop of the mount. this can yield a deadlock
when ndb/dns blocks its 9p loop waiting for requests to complete on
a refresh and the requests are stuck waiting for ndb/cs to translate
a dial string for announce().
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