Hi Jeff,
I have some questions about how NameSubstitution rules work in some edge cases:
On 27 Sep 2015, at 19:47, Jeff Burdges burdges@gnunet.org wrote: ... Configuration
We propose two Tor configuration options :
NameSubstitution [.]source_dnspath [.]target_dnspath NameService [.]dnspath socketspec [noncannonical] [timeout=num] [-- service specific options]
We require that socketspec be either the path to a UNIX domain socket or an address of the form IP:port. We also require that that each *dnspath be a string conforming to RFC 952 and RFC 1123 sec. 2.1. In other words, a dnsspec consists of a series of labels separated by periods . with each label of up to 63 characters consisting of the letters a-z in a case insensitive mannor, the digits 0-9, and the hyphen -, but hyphens may not appear at the beginning or end of labels.
NameSubstitution rules are applied only to DNS query strings provided by the user, not CNAME results. If a trailing substring of a query matches source_dnspath then it is replaced by target_dnspath.
NameService rules route matching query to to appropriate name service supplier software. If a trailing substring of a query matches dnspath, then a query is sent to the socketspec using the RPC protcol descrived below. Of course, NameService rules are applied only after all the NameSubstitution rules.
Are multiple NameSubstitution rules applied in the order they are listed?
For example: NameSubstitution .com .net NameSubstitution .example.net http://example.net/ .example.org
What does foo.example.com http://foo.example.com/ get transformed into?
Are trailing periods significant?
For example: NameSubstitution .com .net
What does example.com http://example.com/. get transformed into?
For example: NameSubstitution .com. .net.
What does example.com http://example.com/ get transformed into?
Are leading periods significant?
For example: NameSubstitution com net
What does example.com http://example.com/ get transformed into? What does foo.viacom get transformed into?
Are duplicate rules significant?
For example: NameSubstitution .com .com.com NameSubstitution .com .com.com
What does example.com http://example.com/ get transformed into?
Is there a length limit for the final query? (DNS names are limited to 255 characters.)
For example: NameSubstitution .a .<254 characters>
What does <253 characters>.a get transformed into?
Tim
Tim Wilson-Brown (teor)
teor2345 at gmail dot com PGP 968F094B
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