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# onion-grab
A tool that visits a list of domains over HTTPS to see if they have
[Onion-Location][] configured.
[Onion-Location]: https://community.torproject.org/onion-services/advanced/onion-location/
**Warning:** research prototype.
## Quickstart
### Install
You will need a [Go compiler][] on the local system:
$ which go >/dev/null || echo "Go compiler is not in PATH"
[Go compiler]: https://go.dev/doc/install
Install `onion-grab`:
$ go install gitlab.torproject.org/tpo/onion-services/onion-grab@latest
List all options:
$ onion-grab -h
### Basic usage
Store one domain per line in a file:
$ cat domains.lst
www.eff.org
www.qubes-os.org
www.torproject.org
Run onion-grab with default parameters:
$ onion-grab -i domains.lst
2023/04/07 20:29:45 INFO: ctrl+C to exit prematurely
2023/04/07 20:29:45 INFO: starting 128 workers with limit 64/s
2023/04/07 20:29:45 INFO: starting work receiver
2023/04/07 20:29:45 INFO: starting work generator
www.qubes-os.org header= attribute=http://qubesosfasa4zl44o4tws22di6kepyzfeqv3tg4e3ztknltfxqrymdad.onion/
www.torproject.org header=http://2gzyxa5ihm7nsggfxnu52rck2vv4rvmdlkiu3zzui5du4xyclen53wid.onion/index.html attribute=
2023/04/07 20:29:50 INFO: metrics@receiver:
Processed: 3
Success: 3 (Onion-Location:2)
Failure: 0 (See breakdown below)
Req: 0 (Before sending request)
DNS: 0 (NotFound:0 Timeout:0 Other:0)
TCP: 0 (Timeout:0 Syscall:0)
TLS: 0 (Cert:0 Other:0)
3xx: 0 (Too many redirects)
EOF: 0 (Unclear meaning)
CTX: 0 (Deadline exceeded)
???: 0 (Other errors)
2023/04/07 20:29:51 INFO: about to exit in at most 11s, reading remaining answers
2023/04/07 20:29:57 INFO: metrics@receiver: summary:
Processed: 3
Success: 3 (Onion-Location:2)
Failure: 0 (See breakdown below)
Req: 0 (Before sending request)
DNS: 0 (NotFound:0 Timeout:0 Other:0)
TCP: 0 (Timeout:0 Syscall:0)
TLS: 0 (Cert:0 Other:0)
3xx: 0 (Too many redirects)
EOF: 0 (Unclear meaning)
CTX: 0 (Deadline exceeded)
???: 0 (Other errors)
2023/04/07 20:29:57 INFO: measurement duration was 12s
Sites with Onion-Location are printed to stdout, here showing that
`www.torproject.org` configures it with an HTTP header while `www.qubes-os.org`
does it with an HTML attribute. All three sites connected successfully.
In case of errors, the type of error is identified with relatively few `???`.
### Scripts
Digest the results, here stored as `onion-grab.stdout`:
$ cat onion-grab.stdout
www.qubes-os.org header= attribute=http://qubesosfasa4zl44o4tws22di6kepyzfeqv3tg4e3ztknltfxqrymdad.onion/
www.torproject.org header=http://2gzyxa5ihm7nsggfxnu52rck2vv4rvmdlkiu3zzui5du4xyclen53wid.onion/index.html attribute=
$ ./scripts/digest.py -i onion-grab.stdout
digest.py:25 INFO: found 1 HTTP headers with Onion-Location
digest.py:26 INFO: found 1 HTML meta attributes with Onion-Location
digest.py:27 INFO: found 2 unqiue domain names that set Onion-Location
digest.py:28 INFO: found 2 unique two-label onion addresses in the process
digest.py:30 INFO: storing domains with valid Onion-Location configurations in domains.txt
digest.py:35 INFO: storing two-label onion addresses that domains referenced in onions.txt
$ cat domains.txt
www.qubes-os.org http://qubesosfasa4zl44o4tws22di6kepyzfeqv3tg4e3ztknltfxqrymdad.onion/
www.torproject.org http://2gzyxa5ihm7nsggfxnu52rck2vv4rvmdlkiu3zzui5du4xyclen53wid.onion/index.html
$ cat onions.txt
qubesosfasa4zl44o4tws22di6kepyzfeqv3tg4e3ztknltfxqrymdad.onion www.qubes-os.org
2gzyxa5ihm7nsggfxnu52rck2vv4rvmdlkiu3zzui5du4xyclen53wid.onion www.torproject.org
In other words, the digest script prints some information and writes two files:
- `domains.txt`: domains that configured valid Onion-Location headers. The
listed Onion-Location values are de-duplicated and space-separated.
- `onions.txt`: two-label `.onion` addresses that were discovered. The listed
domains referenced this address in their Onion-Location configuration,
possibly with subdomains, paths, etc., that were removed. Such pruning of
the set Onion-Location values is useful to estimate the number of onions.
See [scripts/test.sh](./scripts/test.sh) and if you are looking to test
different `onion-grab` configuration. You may find
[scripts/measure.sh](scripts/measure.sh) to be a useful measurement script.
## Running a larger measurement
See [docs/operations.md](TODO)
for measurements of [Tranco top-1M][] and [ct-sans][].
[Tranco top-1M]: https://tranco-list.eu/latest_list
[ct-sans]: https://git.cs.kau.se/rasmoste/ct-sans/-/blob/main/docs/operations.md
## Contact
- rasmus (at) rgdd (dot) se
## Licence
BSD 2-Clause License
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