NewFetcher creates a segment fetcher configured for fetching segments from inside the control service.

NewRouter creates a new Router/Pather/Fetcher, configured for obtaining paths from inside the control service.

NewSplitter creates a segfetcher.Splitter for a segfetcher.Pather used in the path service.

AuthoritativeLookup handles path segment lookup requests in a core AS.

CoreChecker checks whether a given ia is core.

ForwardingLookup handles path segment lookup requests in a non-core AS.

SegSelector selects segments to use for a connection to a remote server.

Pather computes the remote address with a path based on the provided segment.