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Hi, I'm trying to add a new hidden service to a client which is already running one (or more) service. The naive approach,

    controller.set_options([
        ('HiddenServiceDir', hs_dir),
        ('HiddenServicePort', hs_port)
    ])

clobbers the existing services. Since there doesn't seem to be an API call expressly for adding (not replacing) hidden services, I started investigating the idea of fetching the existing hidden services from the client, then re-adding those in addition to the new service.

However, the data returned from get_conf_map('HiddenServiceOptions') isn't appropriate for that, as far as I can tell. That call returns two flat lists (associated with HiddenServiceDir and HiddenServicePort), which leaves us in the dark about which ports are associated with which dirs.

    >>> controller.set_options([('HiddenServiceDir','/tmp/hiddenservice2/'),
                                ('HiddenServicePort','1235 127.0.0.1:1235'),
                                ('HiddenServicePort','1236 127.0.0.1:1236'),
                                ('HiddenServiceDir','/tmp/hiddenservice3/'),
                                ('HiddenServicePort','1237 127.0.0.1:1237')])

    >>> controller.get_conf_map('HiddenServiceOptions')
    {'HiddenServiceDir': ['/tmp/hiddenservice2/', '/tmp/hiddenservice3/'],
     'HiddenServicePort': ['1235 127.0.0.1:1235', '1236 127.0.0.1:1236', '1237 127.0.0.1:1237']}

More useful in this case would be a list of Dir->[Port] mappings:

    >>> controller.get_conf_map('HiddenServiceOptionsMap')
    {'/tmp/hiddenservice2/': ['1235 127.0.0.1:1235','1236 127.0.0.1:1236'],
     '/tmp/hiddenservice3/': ['1237 127.0.0.1:1237']}

With that data, then, it would be easy to make the appropriate SetOptions calls not only to add a new service, but to re-add the existing services.

I'm not very familiar with Tor's control protocol, so perhaps this isn't a limitation of Stem but of the protocol in general.

Trac:
Username: jthayer