mirror of
https://gitlab.torproject.org/tpo/core/tor.git
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248 lines
6.9 KiB
Markdown
248 lines
6.9 KiB
Markdown
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## Tor's modules ##
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### Generic modules ###
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`buffers.c`
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: Implements the `buf_t` buffered data type for connections, and several
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low-level data handling functions to handle network protocols on it.
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`channel.c`
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: Generic channel implementation. Channels handle sending and receiving cells
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among tor nodes.
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`channeltls.c`
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: Channel implementation for TLS-based OR connections. Uses `connection_or.c`.
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`circuitbuild.c`
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: Code for constructing circuits and choosing their paths. (*Note*:
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this module could plausibly be split into handling the client side,
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the server side, and the path generation aspects of circuit building.)
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`circuitlist.c`
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: Code for maintaining and navigating the global list of circuits.
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`circuitmux.c`
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: Generic circuitmux implementation. A circuitmux handles deciding, for a
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particular channel, which circuit should write next.
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`circuitmux_ewma.c`
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: A circuitmux implementation based on the EWMA (exponentially
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weighted moving average) algorithm.
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`circuituse.c`
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: Code to actually send and receive data on circuits.
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`command.c`
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: Handles incoming cells on channels.
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`config.c`
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: Parses options from torrc, and uses them to configure the rest of Tor.
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`confparse.c`
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: Generic torrc-style parser. Used to parse torrc and state files.
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`connection.c`
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: Generic and common connection tools, and implementation for the simpler
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connection types.
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`connection_edge.c`
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: Implementation for entry and exit connections.
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`connection_or.c`
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: Implementation for OR connections (the ones that send cells over TLS).
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`main.c`
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: Principal entry point, main loops, scheduled events, and network
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management for Tor.
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`ntmain.c`
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: Implements Tor as a Windows service. (Not very well.)
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`onion.c`
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: Generic code for generating and responding to CREATE and CREATED
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cells, and performing the appropriate onion handshakes. Also contains
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code to manage the server-side onion queue.
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`onion_fast.c`
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: Implements the old SHA1-based CREATE_FAST/CREATED_FAST circuit
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creation handshake. (Now deprecated.)
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`onion_ntor.c`
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: Implements the Curve25519-based NTOR circuit creation handshake.
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`onion_tap.c`
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: Implements the old RSA1024/DH1024-based TAP circuit creation handshake. (Now
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deprecated.)
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`relay.c`
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: Handles particular types of relay cells, and provides code to receive,
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encrypt, route, and interpret relay cells.
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`scheduler.c`
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: Decides which channel/circuit pair is ready to receive the next cell.
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`statefile.c`
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: Handles loading and storing Tor's state file.
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`tor_main.c`
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: Contains the actual `main()` function. (This is placed in a separate
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file so that the unit tests can have their own `main()`.)
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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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