Re: [tor-relays] Hostname in DirAuthority config

OK, thanks for the clarification and raising the ticket.

To answer the why - for starters I'm trying to run a local tor network for fun and to learn more about tor.

Why am I trying to put a hostname in there? Because the system I'm setting up the network in may not have static IPs. As I understand it I need to maintain a DirAuthority line with a hard coded IP for each and every directory authority I run myself. If I can use a DNS name, this will mean I end up updating the torrc with DirAuthority lines a lot less. With IPs I am forced to change every torrc in my network every time an IP changes.

There are certainly ways around this (I could have a script populate torrc based upon DNS, for example) but it would make my life easier if I didn't have to.

Thanks

On 6 February 2017 at 23:10, teor <teor2345@xxxxxxxxx> wrote:

> On 7 Feb 2017, at 03:31, Andrew Smith <me@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hi
>
> I'm experimenting running my own tor network. To achieve this I'm setting DirAuthority in torrc.
>
> But it seems that I cannot use a hostname for my DirAuthority.

Why are you trying to do this?
If you share your goal, we might be able to help you with a workaround
or alternate strategy.

For example, if you use a hostname in the "Address" field, your
authority will look it up, add the IPv4 to its descriptor, and then
other authorities, relays, and clients will use that address.
(After the network has bootstrapped using the original address.)

> For example:
>
> DirAuthority da1 orport=7000 no-v2 v3ident=xxx da1:7000 xxx
>
> Results in the error:
>
> Unrecognized flag 'da1:7000' on DirAuthority line
>
> If I replace "da1" with an IP address there is no error. Is this expected behaviour?

It is the implemented behaviour, and has been since at least 2006
(tor-0.1.2.2-alpha). The code responsible is:

while (smartlist_len(items)) {
char *flag = smartlist_get(items, 0);
if (TOR_ISDIGIT(flag[0]))
break;

Which means that only IPv4 addresses are guaranteed to work here.

> I'm running tor v0.2.8.12. The documentation calls this an "address" (as opposed to other parts which refer to an "IP") which made me think a hostname would work.

The "Address" torrc option takes a hostname, as do some other options
(I think the HiddenServicePort target is another.)

Thanks for the bug report, we'll fix the man page:
https://trac.torproject.org/projects/tor/ticket/21405

T

--
Tim Wilson-Brown (teor)

teor2345 at gmail dot com
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Andy Smith

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