Parsing the Tor Consensus gives us the IP Addresses of active relays in the Tor network.

Is there a way of getting a relay's descriptors from that particular relay itself ?

Thanks :)

  • Even if it was serving directory requests, it'd be serving the same as any other relay? What are you trying to achieve with this?
    – cacahuatl
    Sep 28 '17 at 2:06
  • Just wanted to know if its possible because it sends descriptors to directory authorities. I wanted to know if we have an IP address of a relay , could we use the stem library to get descriptors to a tor client. Is there any functionality in stem for this? Thanks for the comment :)
    – Mithrandir
    Sep 28 '17 at 2:18
  • Also , certain relays are safe to use for anonymity and querying the DA's produces latency for the network. Also , Tor gives us the flexibility of choosing the guard, middle amd exit, so..
    – Mithrandir
    Sep 28 '17 at 2:25
  • Are you aware of how Tor already fetches directory information? Stem just queries Tor's current cache, you might also be interested in the dir-spec.
    – cacahuatl
    Sep 28 '17 at 3:43
  • Which Tor relay? Is it HSDir?
    – defalt
    Dec 28 '17 at 4:17

A Tor relay's descriptor is available at that relay as the resource '/tor/server/authority[.z]'. This is useful when you don't know the relay's fingerprint.

Using IPredator as an example:

Or, using stem:

import stem.descriptor.remote dir_port = ('', 9030) stem.descriptor.remote.Query(resource='/tor/server/authority.z', endpoints=[dir_port]).run()[0]

Or, if you prefer to use the high-level API, which gets the same relay descriptor, but using a slightly different resource internally ('/tor/server/fp/fingerprint.z'):

import stem.descriptor.remote fingerprint = 'BC630CBBB518BE7E9F4E09712AB0269E9DC7D626' dir_port = ('', 9030) desc = stem.descriptor.remote.get_server_descriptors(fingerprints=[fingerprint], endpoints=[dir_port]).run()[0]

stem can retrieve descriptors using either method, but only when the relay has a DirPort.

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