mirror of
https://gitlab.torproject.org/tpo/core/tor.git
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159 lines
4.3 KiB
Markdown
159 lines
4.3 KiB
Markdown
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## Tor's modules ##
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### Node-status modules ###
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`directory.c`
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: Implements the HTTP-based directory protocol, including sending,
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receiving, and handling most request types. (*Note*: The client parts
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of this, and the generic-HTTP parts of this, could plausibly be split
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off.)
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`microdesc.c`
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: Implements the compact "microdescriptor" format for keeping track of
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what we know about a router.
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`networkstatus.c`
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: Code for fetching, storing, and interpreting consensus vote documents.
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`nodelist.c`
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: Higher-level view of our knowledge of which Tor servers exist. Each
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`node_t` corresponds to a router we know about.
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`routerlist.c`
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: Code for storing and retrieving router descriptors and extrainfo
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documents.
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`routerparse.c`
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: Generic and specific code for parsing all Tor directory information
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types.
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`routerset.c`
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: Parses and interprets a specification for a set of routers (by IP
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range, fingerprint, nickname (deprecated), or country).
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### Client modules ###
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`addressmap.c`
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: Handles client-side associations between one address and another.
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These are used to implement client-side DNS caching (NOT RECOMMENDED),
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MapAddress directives, Automapping, and more.
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`circpathbias.c`
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: Path bias attack detection for circuits: tracks whether
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connections made through a particular guard have an unusually high failure rate.
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`circuitstats.c`
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: Code to track circuit performance statistics in order to adapt our behavior.
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Notably includes an algorithm to track circuit build times.
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`dnsserv.c`
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: Implements DNSPort for clients. (Note that in spite of the word
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"server" in this module's name, it is used for Tor clients. It
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implements a DNS server, not DNS for servers.)
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`entrynodes.c`
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: Chooses, monitors, and remembers guard nodes. Also contains some
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bridge-related code.
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`torcert.c`
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: Code to interpret and generate Ed25519-based certificates.
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### Server modules ###
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`dns.c`
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: Server-side DNS code. Handles sending and receiving DNS requests on
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exit nodes, and implements the server-side DNS cache.
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`dirserv.c`
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: Implements part of directory caches that handles responding to
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client requests.
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`ext_orport.c`
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: Implements the extended ORPort protocol for communication between
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server-side pluggable transports and Tor servers.
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`hibernate.c`
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: Performs bandwidth accounting, and puts Tor relays into hibernation
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when their bandwidth is exhausted.
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`router.c`
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: Management code for running a Tor server. In charge of RSA key
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maintenance, descriptor generation and uploading.
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`routerkeys.c`
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: Key handling code for a Tor server. (Currently handles only the
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Ed25519 keys, but the RSA keys could be moved here too.)
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### Onion service modules ###
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`rendcache.c`
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: Stores onion service descriptors.
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`rendclient.c`
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: Client-side implementation of the onion service protocol.
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`rendcommon.c`
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: Parts of the onion service protocol that are shared by clients,
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services, and/or Tor servers.
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`rendmid.c`
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: Tor-server-side implementation of the onion service protocol. (Handles
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acting as an introduction point or a rendezvous point.)
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`rendservice.c`
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: Service-side implementation of the onion service protocol.
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`replaycache.c`
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: Backend to check introduce2 requests for replay attempts.
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### Authority modules ###
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`dircollate.c`
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: Helper for `dirvote.c`: Given a set of votes, each containing a list
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of Tor nodes, determines which entries across all the votes correspond
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to the same nodes, and yields them in a useful order.
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`dirvote.c`
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: Implements the directory voting algorithms that authorities use.
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`keypin.c`
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: Implements a persistent key-pinning mechanism to tie RSA1024
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identities to ed25519 identities.
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### Miscellaneous modules ###
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`control.c`
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: Implements the Tor controller protocol.
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`cpuworker.c`
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: Implements the inner work queue function. We use this to move the
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work of circuit creation (on server-side) to other CPUs.
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`fp_pair.c`
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: Types for handling 2-tuples of 20-byte fingerprints.
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`geoip.c`
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: Parses geoip files (which map IP addresses to country codes), and
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performs lookups on the internal geoip table. Also stores some
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geoip-related statistics.
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`policies.c`
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: Parses and implements Tor exit policies.
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`reasons.c`
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: Maps internal reason-codes to human-readable strings.
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`rephist.c`
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: Tracks Tor servers' performance over time.
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`status.c`
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: Writes periodic "heartbeat" status messages about the state of the Tor
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process.
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`transports.c`
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: Implements management for the pluggable transports subsystem.
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