File List

Here is a list of all documented files with brief descriptions:

[detail level 12345]

▼ app	App: top-level entry point for Tor
► config	App/config: Top-level configuration code
auth_dirs.inc
config.c	Code to interpret the user's configuration of Tor
config.h	Header file for config.c
fallback_dirs.inc
or_options_st.h	The or_options_t structure, which represents Tor's configuration
or_state_st.h	The or_state_t structure, which represents Tor's state file
quiet_level.c	Code to handle default logging level (quiet/hush/normal)
quiet_level.h	Declare the quiet_level enumeration and global
resolve_addr.c	Implement resolving address functions
resolve_addr.h	Header file for resolve_addr.c
statefile.c	Handles parsing and encoding the persistent 'state' file that carries miscellaneous persistent state between Tor invocations
statefile.h	Header for statefile.c
testnet.inc
tor_cmdline_mode.h	Declare the tor_cmdline_mode_t enumeration
► main	App/main: Entry point for tor
main.c	Invocation module. Initializes subsystems and runs the main loop
main.h	Header file for main.c
ntmain.c	Entry points for running/configuring Tor as a Windows Service
ntmain.h	Header file for ntmain.c
risky_options.c	List compile-time options that might make Tor less reliable
risky_options.h	Header for risky_options.c
shutdown.c	Code to free global resources used by Tor
shutdown.h	Header file for shutdown.c
subsysmgr.c	Manager for Tor's subsystems
subsysmgr.h	Header for subsysmgr.c
subsystem_list.c	List of Tor's subsystems
tor_main.c	Stub module containing a main() function
▼ core	Core: main loop and onion routing functionality
► crypto	Core/crypto: Tor-specific cryptography
hs_ntor.c	Implements the ntor variant used in Tor hidden services
hs_ntor.h	Header for hs_ntor.c
onion_crypto.c	Functions to handle different kinds of circuit extension crypto
onion_crypto.h	Header file for onion_crypto.c
onion_fast.c	Functions implement the CREATE_FAST circuit handshake
onion_fast.h	Header file for onion_fast.c
onion_ntor.c	Implementation for the ntor handshake
onion_ntor.h	Header for onion_ntor.c
onion_ntor_v3.c	Implements the version 3 ntor handshake as first specified in proposal 332
onion_ntor_v3.h	Header for core/crypto/onion_ntor_v3.c
relay_crypto.c
relay_crypto.h	Header for relay_crypto.c
► mainloop	Core/mainloop: Non-onion-routing mainloop functionality
connection.c	General high-level functions to handle reading and writing on connections
connection.h	Header file for connection.c
cpuworker.c	Uses the workqueue/threadpool code to farm CPU-intensive activities out to subprocesses
cpuworker.h	Header file for cpuworker.c
mainloop.c	Toplevel module. Handles signals, multiplexes between connections, implements main loop, and drives scheduled events
mainloop.h	Header file for mainloop.c
mainloop_pubsub.c	Connect the publish-subscribe code to the main-loop
mainloop_pubsub.h	Header for mainloop_pubsub.c
mainloop_state.inc	Declare configuration options for the crypto_ops module
mainloop_state_st.h	Declare a state structure for mainloop-relevant fields
mainloop_sys.c	Declare the "mainloop" subsystem
mainloop_sys.h	Header for mainloop_sys.c
netstatus.c	Track whether the network is disabled, dormant, etc
netstatus.h	Header for netstatus.c
periodic.c	Generic backend for handling periodic events
periodic.h	Header for periodic.c
► or	Core/or: Onion routing happens here!
addr_policy_st.h	Address policy structures
address_set.c	Implementation for a set of addresses
address_set.h	Types to handle sets of addresses
cell_queue_st.h	Cell queue structures
cell_st.h	Fixed-size cell structure
channel.c	OR/OP-to-OR channel abstraction layer. A channel's job is to transfer cells from Tor instance to Tor instance. Currently, there is only one implementation of the channel abstraction: in channeltls.c
channel.h	Header file for channel.c
channelpadding.c	Link-level padding code
channelpadding.h
channeltls.c	A concrete subclass of channel_t using or_connection_t to transfer cells between Tor instances
channeltls.h	Header file for channeltls.c
circuit_st.h	Base circuit structure
circuitbuild.c	Implements the details of building circuits (by choosing paths, constructing/sending create/extend cells, and so on)
circuitbuild.h	Header file for circuitbuild.c
circuitlist.c	Manage global structures that list and index circuits, and look up circuits within them
circuitlist.h	Header file for circuitlist.c
circuitmux.c	Circuit mux/cell selection abstraction
circuitmux.h	Header file for circuitmux.c
circuitmux_ewma.c	EWMA circuit selection as a circuitmux_t policy
circuitmux_ewma.h	Header file for circuitmux_ewma.c
circuitpadding.c	Circuit-level padding implementation
circuitpadding.h	Header file for circuitpadding.c
circuitpadding_machines.c	Circuit padding state machines
circuitpadding_machines.h	Header file for circuitpadding_machines.c
circuitstats.c	Maintains and analyzes statistics about circuit built times, so we can tell how long we may need to wait for a fast circuit to be constructed
circuitstats.h	Header file for circuitstats.c
circuituse.c	Launch the right sort of circuits and attach the right streams to them
circuituse.h	Header file for circuituse.c
command.c	Functions for processing incoming cells
command.h	Header file for command.c
conflux.c	Conflux multipath core algorithms
conflux.h	Public APIs for conflux multipath support
conflux_cell.c	XXX: Write a brief introduction to this module
conflux_cell.h	Header file for conflux_cell.c
conflux_params.c
conflux_params.h	Header file for conflux_params.c
conflux_pool.c	Conflux circuit pool management
conflux_pool.h	Header file for conflux_pool.c
conflux_st.h	Structure definitions for conflux multipath
conflux_sys.c	Register the conflux pool for early initialization
conflux_sys.h	Header file for conflux_sys.c
conflux_util.c	Conflux utility functions for stream blocking and management
conflux_util.h	Header file for conflux_util.c
congestion_control_common.c	Common code used by all congestion control algorithms
congestion_control_common.h	Public APIs for congestion control
congestion_control_flow.c	Code that implements flow control for congestion controlled circuits
congestion_control_flow.h	APIs for stream flow control on congestion controlled circuits
congestion_control_st.h	Structure definitions for congestion control
congestion_control_vegas.c	Code that implements the TOR_VEGAS congestion control algorithm from Proposal #324
congestion_control_vegas.h	Private-ish APIs for the TOR_VEGAS congestion control algorithm
connection_edge.c	Handle edge streams
connection_edge.h	Header file for connection_edge.c
connection_or.c	Functions to handle OR connections, TLS handshaking, and cells on the network
connection_or.h	Header file for connection_or.c
connection_st.h	Base connection structure
cpath_build_state_st.h	Circuit-build-stse structure
crypt_path.c	Functions dealing with layered circuit encryption. This file aims to provide an API around the crypt_path_t structure which holds crypto information about a specific hop of a circuit
crypt_path.h	Header file for crypt_path.c
crypt_path_reference_st.h	Reference-counting structure for crypt_path_t
crypt_path_st.h	Path structures for origin circuits
destroy_cell_queue_st.h	Destroy-cell queue structures
dos.c
dos.h
dos_config.c	Code to interpret the user's configuration of DoS module
dos_config.h	Header for core/or/dos_config.c
dos_options.inc	Declare configuration options for the DoS module
dos_options_st.h	Structure dos_options_t to hold options for the DoS subsystem
dos_sys.c	Subsystem definitions for DOS module
dos_sys.h	Header for core/or/dos_sys.c
edge_connection_st.h	Edge-connection structure
entry_connection_st.h	Entry connection structure
entry_port_cfg_st.h	Configuration structure for client ports
extend_info_st.h	Extend-info structure
extendinfo.c	Functions for creating and using extend_info_t objects
extendinfo.h	Header for core/or/extendinfo.c
half_edge_st.h	Half-open connection structure
listener_connection_st.h	Listener connection structure
lttng_cc.inc	LTTng tracing probe declaration for the congestion control subsystem. It is in this .inc file due to the non C standard syntax and the way we guard the header with the LTTng specific TRACEPOINT_HEADER_MULTI_READ
lttng_circuit.inc	LTTng tracing probe declaration for the circuit subsystem. It is in this .inc file due to the non C standard syntax and the way we guard the header with the LTTng specific TRACEPOINT_HEADER_MULTI_READ
ocirc_event.c	Publish state change messages for origin circuits
ocirc_event.h	Header file for ocirc_event.c
onion.c	Functions to queue create cells, and parse and create the CREATE cell and its allies
onion.h	Header file for onion.c
or.h	Master header file for Tor-specific functionality
or_circuit_st.h
or_connection_st.h	OR connection structure
or_handshake_certs_st.h	OR handshake certs structure
or_handshake_state_st.h	OR handshake state structure
or_periodic.c	Periodic callbacks for the onion routing subsystem
or_periodic.h	Header for core/or/or_periodic.c
or_sys.c	Subsystem definitions for OR module
or_sys.h	Header for core/or/or_sys.c
orconn_event.c	Publish state change messages for OR connections
orconn_event.h	Header file for orconn_event.c
origin_circuit_st.h	Origin circuit structure
policies.c	Code to parse and use address policies and exit policies
policies.h	Header file for policies.c
port_cfg_st.h	Listener port configuration structure
protover.c	Versioning information for different pieces of the Tor protocol
protover.h	Headers and type declarations for protover.c
reasons.c	Convert circuit, stream, and orconn error reasons to and/or from strings and errno values
reasons.h	Header file for reasons.c
relay.c	Handle relay cell encryption/decryption, plus packaging and receiving from circuits, plus queuing on circuits
relay.h	Header file for relay.c
relay_crypto_st.h	Relay-cell encryption state structure
relay_msg.c	Encoding relay messages into cells
relay_msg.h	Header file for relay_msg.c
relay_msg_st.h	A relay message which contains a relay command and parameters, if any, that is from a relay cell
scheduler.c	Channel scheduling system: decides which channels should send and receive when
scheduler.h	Header file for scheduler*.c
scheduler_kist.c	Implements the KIST cell scheduler
scheduler_vanilla.c	"Vanilla" (pre-KIST) cell scheduler code
sendme.c	Code that is related to SENDME cells both in terms of creating/parsing cells and handling the content
sendme.h	Header file for sendme.c
server_port_cfg_st.h	Configuration structure for server ports
socks_request_st.h	Client request structure
status.c	Collect status information and log heartbeat messages
status.h	Header for status.c
tor_version_st.h	Parsed Tor version structure
trace_probes_cc.c	Tracepoint provider source file for the cc subsystem. Probes are generated within this C file for LTTng-UST
trace_probes_cc.h
trace_probes_circuit.c	Tracepoint provider source file for the circuit subsystem. Probes are generated within this C file for LTTng-UST
trace_probes_circuit.h
var_cell_st.h	Variable-length cell structure
versions.c	Code to manipulate, parse, and compare Tor versions
versions.h	Header file for versions.c
► proto	Core/proto: Protocol encoding/decoding
proto_cell.c	Decodes Tor cells from buffers
proto_cell.h	Header for proto_cell.c
proto_control0.c	Code to detect the obsolete v0 control protocol
proto_control0.h	Header for proto_control0.c
proto_ext_or.c	Parsing/encoding for the extended OR protocol
proto_ext_or.h	Header for proto_ext_or.c
proto_haproxy.c
proto_haproxy.h
proto_http.c	Parse a subset of the HTTP protocol
proto_http.h	Header for proto_http.c
proto_socks.c	Implementations for SOCKS4 and SOCKS5 protocols
proto_socks.h	Header for proto_socks.c
▼ ext	Externally maintained code
► curve25519_donna
curve25519-donna-c64.c
curve25519-donna.c
► equix
► hashx
► include
hashx.h
► src
bench.c
blake2.c
blake2.h
compiler.c
compiler.h
compiler_a64.c
compiler_x86.c
context.c
context.h
force_inline.h
hashx.c
hashx_endian.h
hashx_thread.c
hashx_thread.h
hashx_time.c
hashx_time.h
instruction.h
program.c
program.h
program_exec.c
siphash.c
siphash.h
siphash_rng.c
siphash_rng.h
test_utils.h
tests.c
unreachable.h
virtual_memory.c
virtual_memory.h
► include
equix.h
► src
bench.c
context.c
context.h
equix.c
solver.c
solver.h
solver_heap.h
tests.c
► keccak-tiny
keccak-tiny-unrolled.c
keccak-tiny.c
keccak-tiny.h
► mulodi
mulodi4.c
► timeouts
► bench
bench-heap.c
bench-llrb.c
bench-wheel.c
bench.c
bench.h
► lua
timeout-lua.c
test-timeout.c
timeout-bitops.c
timeout-debug.h
timeout.c
timeout.h
► trunnel
trunnel-impl.h
trunnel.c
trunnel.h
byteorder.h
compat_blake2.h	Compatibility adapter providing blake2b using ext/equix/hashx
csiphash.c
getdelim.c
ht.h
OpenBSD_malloc_Linux.c
readpassphrase.c
siphash.h
strlcat.c
strlcpy.c
tinytest.c
tinytest.h
tinytest_demo.c
tinytest_macros.h
tor_queue.h
tor_readpassphrase.h
▼ feature	Feature: domain-specific modules
► api	Feature/api: In-process interface to starting/stopping Tor
tor_api.c
tor_api.h	Public C API for the Tor network service
tor_api_internal.h	Internal declarations for in-process Tor API
► client	Feature/client: Client-specific code
addressmap.c	The addressmap module manages the processes by which we rewrite addresses in client requess. It handles the MapAddress controller and torrc commands, and the TrackHostExits feature, and the client-side DNS cache (deprecated)
addressmap.h	Header for addressmap.c
bridges.c	Code to manage bridges and bridge selection
bridges.h	Header file for circuitbuild.c
circpathbias.c	Code to track success/failure rates of circuits built through different tor nodes, in an attempt to detect attacks where an attacker deliberately causes circuits to fail until the client choses a path they like
circpathbias.h
dnsserv.c	Implements client-side DNS proxy server code
dnsserv.h	Header file for dnsserv.c
entrynodes.c	Code to manage our fixed first nodes for various functions
entrynodes.h	Header file for circuitbuild.c
proxymode.c	Determine whether we are trying to be a proxy
proxymode.h	Header file for proxymode.c
transports.c	Pluggable Transports related code
transports.h	Headers for transports.c
► control	Feature/control: Controller API
btrack.c	Bootstrap trackers
btrack_circuit.c	Bootstrap tracker for origin circuits
btrack_circuit.h	Header file for btrack_circuit.c
btrack_orconn.c	Bootstrap tracker for OR connections
btrack_orconn.h	Header file for btrack_orconn.c
btrack_orconn_cevent.c	Emit bootstrap status events for OR connections
btrack_orconn_cevent.h	Header file for btrack_orconn_cevent.c
btrack_orconn_maps.c	Hash map implementation for btrack_orconn.c
btrack_orconn_maps.h	Header file for btrack_orconn_maps.c
btrack_sys.h	Declare subsystem object for the bootstrap tracker susbystem
control.c	Implementation for Tor's control-socket interface
control.h	Header file for control.c
control_auth.c	Authentication for Tor's control-socket interface
control_auth.h	Header file for control_auth.c
control_bootstrap.c	Provide bootstrap progress events for the control port
control_cmd.c	Implement various commands for Tor's control-socket interface
control_cmd.h	Header file for control_cmd.c
control_cmd_args_st.h	Definition for control_cmd_args_t
control_connection_st.h	Controller connection structure
control_events.c	Implement the event-reporting part of the controller API
control_events.h	Header file for control_events.c
control_fmt.c	Formatting functions for controller data
control_fmt.h	Header file for control_fmt.c
control_getinfo.c	Implementation for miscellaneous controller getinfo commands
control_getinfo.h
control_hs.c	Implement commands for Tor's control-socket interface that are related to onion services
control_hs.h
control_proto.c	Formatting functions for controller data
control_proto.h	Header file for control_proto.c
getinfo_geoip.c	GEOIP-related controller GETINFO commands
getinfo_geoip.h	Header for getinfo_geoip.c
► dirauth	Feature/dirauth: Directory authority implementation
authmode.c	What kind of directory authority are we?
authmode.h	Header file for directory authority mode
bridgeauth.c	Bridge authority code
bridgeauth.h	Header for bridgeauth.c
bwauth.c	Code to read and apply bandwidth authority data
bwauth.h	Header file for bwauth.c
dirauth_config.c	Code to interpret the user's configuration of Tor's directory authority module
dirauth_config.h	Header for feature/dirauth/dirauth_config.c
dirauth_options.inc	Declare configuration options for the crypto_ops module
dirauth_options_st.h	Structure dirauth_options_t to hold directory authority options
dirauth_periodic.c	Peridoic events for directory authorities
dirauth_periodic.h	Header for dirauth_periodic.c
dirauth_stub.c	Stub declarations for use when dirauth module is disabled
dirauth_sys.c	Directory authority subsystem declarations
dirauth_sys.h	Header for dirauth_sys.c
dircollate.c	Collation code for figuring out which identities to vote for in the directory voting process
dircollate.h	Header file for dircollate.c
dirvote.c	Functions to compute directory consensus, and schedule voting
dirvote.h	Header file for dirvote.c
dsigs_parse.c
dsigs_parse.h	Code to parse and validate detached-signature objects
guardfraction.c
guardfraction.h	Header file for guardfraction.c
keypin.c	Functions and structures for associating routers' RSA key fingerprints with their ED25519 keys
keypin.h	Header for keypin.c
ns_detached_signatures_st.h	Detached consensus signatures structure
process_descs.c	Make decisions about uploaded descriptors
process_descs.h	Header file for process_descs.c
reachability.c	Router reachability testing; run by authorities to tell who is running
reachability.h	Header file for reachability.c
recommend_pkg.c	Code related to the recommended-packages subsystem
recommend_pkg.h	Header file for recommend_pkg.c
shared_random.c	Functions and data structure needed to accomplish the shared random protocol as defined in proposal #250
shared_random.h	This file contains ABI/API of the shared random protocol defined in proposal #250. Every public functions and data structure are namespaced with "sr_" which stands for shared random
shared_random_state.c	Functions and data structures for the state of the random protocol as defined in proposal #250
shared_random_state.h	Header for shared_random_state.c
vote_microdesc_hash_st.h	Microdescriptor-hash voting structure
voteflags.c	Authority code for deciding the performance thresholds for flags, and assigning flags to routers
voteflags.h	Header file for voteflags.c
voting_schedule.c	Compute information about our voting schedule as a directory authority
voting_schedule.h	Header file for voting_schedule.c
► dircache	Feature/dircache: Run as a directory cache server
cached_dir_st.h	Cached large directory object structure
conscache.c	Consensus and diff on-disk cache
conscache.h	Header for conscache.c
consdiffmgr.c	Consensus diff manager functions
consdiffmgr.h	Header for consdiffmgr.c
dircache.c	Cache directories and serve them to clients
dircache.h	Header file for dircache.c
dircache_stub.c	Stub declarations for use when dircache module is disabled
dirserv.c	Directory server core implementation. Manages directory contents and generates directory documents
dirserv.h	Header file for dirserv.c
► dirclient	Feature/dirclient: Directory client implementation
dir_server_st.h	Trusted/fallback directory server structure
dirclient.c	Download directory information
dirclient.h	Header file for dirclient.c
dirclient_modes.c	Functions to answer questions about how we'd like to behave as a directory client
dirclient_modes.h	Header for feature/dirclient/dirclient_modes.c
dlstatus.c	Track status and retry schedule of a downloadable object
dlstatus.h	Header file for dlstatus.c
download_status_st.h	Directory download status/schedule structure
► dircommon	Feature/dircommon: Directory client and server shared code
consdiff.c	Consensus diff implementation, including both the generation and the application of diffs in a minimal ed format
consdiff.h	Header for consdiff.c
dir_connection_st.h	Client/server directory connection structure
directory.c	Code to send and fetch information from directory authorities and caches via HTTP
directory.h	Header file for directory.c
fp_pair.c	Manages data structures for associating pairs of fingerprints. Used to handle combinations of identity/signing-key fingerprints for authorities
fp_pair.h	Header file for fp_pair.c
vote_timing_st.h	Directory voting schedule structure
► dirparse	Feature/dirparse: Parsing Tor directory objects
authcert_members.h	List of tokens common to V3 authority certificates and V3 consensuses
authcert_parse.c	Authority certificate parsing
authcert_parse.h	Header file for authcert_parse.c
microdesc_parse.c	Code to parse and validate microdescriptors
microdesc_parse.h	Header file for microdesc_parse.c
ns_parse.c
ns_parse.h	Header file for ns_parse.c
parsecommon.c	Common code to parse and validate various type of descriptors
parsecommon.h	Header file for parsecommon.c
policy_parse.c	Code to parse address policies
policy_parse.h	Header file for policy_parse.c
routerparse.c	Code to parse and validate consensus documents and votes
routerparse.h	Header file for routerparse.c
sigcommon.c	Shared hashing, signing, and signature-checking code for directory objects
sigcommon.h	Header file for sigcommon.c
signing.c	Code to sign directory objects
signing.h	Header file for signing.c
unparseable.c	Dump unparseable objects to disk
unparseable.h	Header file for unparseable.c
► hibernate	Feature/hibernate: Bandwidth accounting and hibernation (!)
hibernate.c	Functions to close listeners, stop allowing new circuits, etc in preparation for closing down or going dormant; and to track bandwidth and time intervals to know when to hibernate and when to stop hibernating
hibernate.h	Header file for hibernate.c
► hs	Feature/hs: v3 (current) onion service protocol
hs_cache.c	Handle hidden service descriptor caches
hs_cache.h	Header file for hs_cache.c
hs_cell.c	Hidden service API for cell creation and handling
hs_cell.h	Header file containing cell data for the whole HS subsystem
hs_circuit.c
hs_circuit.h	Header file containing circuit data for the whole HS subsystem
hs_circuitmap.c	Hidden service circuitmap: A hash table that maps binary tokens to introduction and rendezvous circuits; it's used: (a) by relays acting as intro points and rendezvous points (b) by hidden services to find intro and rend circuits and (c) by HS clients to find rendezvous circuits
hs_circuitmap.h	Header file for hs_circuitmap.c
hs_client.c	Implement next generation hidden service client functionality
hs_client.h	Header file containing client data for the HS subsystem
hs_common.c	Contains code shared between different HS protocol version as well as useful data structures and accessors used by other subsystems
hs_common.h	Header file containing common data for the whole HS subsystem
hs_config.c	Implement hidden service configuration subsystem
hs_config.h	Header file containing configuration ABI/API for the HS subsystem
hs_control.c	Contains control port event related code
hs_control.h	Header file containing control port event related code
hs_descriptor.c	Handle hidden service descriptor encoding/decoding
hs_descriptor.h	Header file for hs_descriptor.c
hs_dos.c	Implement denial of service mitigation for the onion service subsystem
hs_dos.h	Header file containing denial of service defenses for the HS subsystem for all versions
hs_ident.c	Contains circuit and connection identifier code for the whole HS subsystem
hs_ident.h	Header file containing circuit and connection identifier data for the whole HS subsystem
hs_intropoint.c	Implement next generation introductions point functionality
hs_intropoint.h	Header file for hs_intropoint.c
hs_metrics.c	Onion service metrics exposed through the MetricsPort
hs_metrics.h	Header for feature/hs/hs_metrics.c
hs_metrics_entry.c	Defines the metrics entry that are collected by an onion service
hs_metrics_entry.h	Header for feature/hs/hs_metrics_entry.c
hs_ob.c	Implement Onion Balance specific code
hs_ob.h	Header file for the specific code for onion balance
hs_options.inc
hs_opts_st.h
hs_pow.c	Contains code to handle proof-of-work computations when a hidden service is defending against DoS attacks
hs_pow.h	Header file containing PoW denial of service defenses for the HS subsystem for all versions
hs_service.c	Implement next generation hidden service functionality
hs_service.h	Header file containing service data for the HS subsystem
hs_stats.c	Keeps stats about the activity of our onion service(s)
hs_stats.h	Header file for hs_stats.c
hs_sys.c	Setup and tear down the HS subsystem
hs_sys.h	Header for feature/hs/hs_sys.c
hsdir_index_st.h	HS directory index structure
► hs_common	Feature/hs_common: Common to v2 (old) and v3 (current) onion services
replaycache.c	Self-scrubbing replay cache for rendservice.c
replaycache.h	Header file for replaycache.c
shared_random_client.c	This file contains functions that are from the shared random subsystem but used by many part of tor. The full feature is built as part of the dirauth module
shared_random_client.h	Header file for shared_random_client.c
► keymgt	Feature/keymgt: Store keys for relays, authorities, etc
loadkey.c	Read keys from disk, creating as needed
loadkey.h	Header file for loadkey.c
► metrics
metrics.c	Metrics subsystem
metrics.h	Header for feature/metrics/metrics.c
metrics_sys.c	Setup and tear down the metrics subsystem
metrics_sys.h	Header for feature/metrics/metrics_sys.c
► nodelist	Feature/nodelist: Download and manage a list of relays
authcert.c	Code to maintain directory authorities' certificates
authcert.h	Header file for authcert.c
authority_cert_st.h	Authority certificate structure
desc_store_st.h	Routerinfo/extrainfo storage structure
describe.c	Format short descriptions of relays
describe.h	Header file for describe.c
dirlist.c	Code to maintain our lists of directory authorities and fallback directories
dirlist.h	Header file for dirlist.c
document_signature_st.h	Authority signature structure
extrainfo_st.h	A relay's extra-info structure
fmt_routerstatus.c
fmt_routerstatus.h	Format routerstatus entries for controller, vote, or consensus
microdesc.c	Implements microdescriptors – an abbreviated description of less-frequently-changing router information
microdesc.h	Header file for microdesc.c
microdesc_st.h	Microdescriptor structure
networkstatus.c	Functions and structures for handling networkstatus documents as a client or as a directory cache
networkstatus.h	Header file for networkstatus.c
networkstatus_sr_info_st.h	Shared-randomness structure
networkstatus_st.h	Networkstatus consensus/vote structure
networkstatus_voter_info_st.h	Single consensus voter structure
nickname.c	Check and manipulate relay nicknames
nickname.h	Header file for nickname.c
node_select.c	Code to choose nodes randomly based on restrictions and weighted probabilities
node_select.h	Header file for node_select.c
node_st.h	Node information structure
nodefamily.c	Code to manipulate encoded, reference-counted node families. We use these tricks to save space, since these families would otherwise require a large number of tiny allocations
nodefamily.h	Header file for nodefamily.c
nodefamily_st.h	Compact node-family structure
nodelist.c	Structures and functions for tracking what we know about the routers on the Tor network, and correlating information from networkstatus, routerinfo, and microdescs
nodelist.h	Header file for nodelist.c
routerinfo.c	Manipulate full router descriptors
routerinfo.h	Header file for routerinfo.c
routerinfo_st.h	Router descriptor structure
routerlist.c	Code to maintain and access the global list of routerinfos for known servers
routerlist.h	Header file for routerlist.c
routerlist_st.h	Router descriptor list structure
routerset.c	Functions and structures to handle set-type selection of routers by name, ID, address, etc
routerset.h	Header file for routerset.c
routerstatus_st.h	Routerstatus (consensus entry) structure
signed_descriptor_st.h	Descriptor/extrainfo signature structure
torcert.c	Implementation for ed25519-signed certificates as used in the Tor protocol
torcert.h	Header for torcert.c
vote_routerstatus_st.h	Routerstatus (vote entry) structure
► relay	Feature/relay: Relay-specific code
circuitbuild_relay.c	Implements the details of exteding circuits (by relaying extend cells as create cells, and answering create cells)
circuitbuild_relay.h	Header for feature/relay/circuitbuild_relay.c
dns.c	Implements a local cache for DNS results for Tor servers. This is implemented as a wrapper around Adam Langley's eventdns.c code. (We can't just use gethostbyname() and friends because we really need to be nonblocking.)
dns.h	Header file for dns.c
dns_structs.h	Structures used in dns.c. Exposed to dns.c, and to the unit tests that declare DNS_PRIVATE
ext_orport.c	Code implementing the Extended ORPort
ext_orport.h	Header for ext_orport.c
onion_queue.c	Functions to queue create cells for processing
onion_queue.h	Header file for onion_queue.c
relay_config.c	Code to interpret the user's configuration of Tor's relay module
relay_config.h	Header for feature/relay/relay_config.c
relay_find_addr.c	Implement mechanism for a relay to find its address
relay_find_addr.h	Header file for relay_find_addr.c
relay_handshake.c	Functions to implement the relay-only parts of our connection handshake
relay_handshake.h	Header for feature/relay/relay_handshake.c
relay_metrics.c	Relay metrics exposed through the MetricsPort
relay_metrics.h	Header for feature/relay/relay_metrics.c
relay_periodic.c	Periodic functions for the relay subsystem
relay_periodic.h	Header for feature/relay/relay_periodic.c
relay_stub.c	Stub declarations for use when relay module is disabled
relay_sys.c	Subsystem definitions for the relay module
relay_sys.h	Header for feature/relay/relay_sys.c
router.c	Miscellaneous relay functionality, including RSA key maintenance, generating and uploading server descriptors, picking an address to advertise, and so on
router.h	Header file for router.c
routerkeys.c	Functions and structures to handle generating and maintaining the set of keypairs necessary to be an OR
routerkeys.h	Header for routerkeys.c
routermode.c	Check if we're running as a relay/cache
routermode.h	Header file for routermode.c
selftest.c	Relay self-testing
selftest.h	Header file for selftest.c
transport_config.c	Code to interpret the user's configuration of Tor's server pluggable transports
transport_config.h	Header for feature/relay/transport_config.c
► rend
rendcommon.c	Rendezvous implementation: shared code between introducers, services, clients, and rendezvous points
rendcommon.h	Header file for rendcommon.c
rendmid.c	Implement introductions points and rendezvous points
rendmid.h	Header file for rendmid.c
► stats	Feature/stats: Relay statistics. Also, port prediction
bw_array_st.h	Declaration for bw_array_t structure and related constants
bwhist.c	Tracking for relay bandwidth history
bwhist.h	Header for feature/stats/bwhist.c
connstats.c	Count bidirectional vs one-way connections
connstats.h	Header for feature/stats/connstats.c
geoip_stats.c
geoip_stats.h	Header file for geoip_stats.c
predict_ports.c	Remember what ports we've needed so we can have circuits ready
predict_ports.h	Header file for predict_ports.c
rephist.c	Basic history and performance-tracking functionality
rephist.h	Header file for rephist.c
▼ lib	Lib: low-level functionality
► arch	Lib/arch: Compatibility code for handling different CPU architectures
bytes.h	Inline functions for reading and writing multibyte values from the middle of strings, and for manipulating byte order
► buf	Lib/buf: An efficient byte queue
buffers.c	Implements a generic buffer interface
buffers.h	Header file for buffers.c
► cc	Lib/cc: Macros for managing the C compiler and language
compat_compiler.h	Utility macros to handle different features and behavior in different compilers
ctassert.h	Compile-time assertions: CTASSERT(expression)
tokpaste.h	Token-pasting macros
torint.h	Integer definitions used throughout Tor
► compress	Lib/compress: Wraps several compression libraries
compress.c	Common compression API implementation
compress.h	Headers for compress.c
compress_buf.c	Working with compressed data in buffers
compress_lzma.c	Compression backend for LZMA
compress_lzma.h	Header for compress_lzma.c
compress_none.c	Compression backend for identity compression
compress_none.h	Header for compress_none.c
compress_sys.h	Declare subsystem object for the compress module
compress_zlib.c	Compression backend for gzip and zlib
compress_zlib.h	Header for compress_zlib.c
compress_zstd.c	Compression backend for Zstandard
compress_zstd.h	Header for compress_zstd.c
► conf	Lib/conf: Types and macros for declaring configuration options
confdecl.h	Macros for generating a configuration struct from a list of its individual fields
confmacros.h	Macro definitions for declaring configuration variables
conftesting.h	Macro and type declarations for testing
conftypes.h	Types used to specify configurable options
► confmgt	Lib/confmgt: Parse, encode, manipulate configuration files
confmgt.c	Back-end for parsing and generating key-value files, used to implement the torrc file format and the state file
confmgt.h	Header for confmgt.c
structvar.c	Functions to manipulate named and typed elements of a structure
structvar.h	Header for lib/confmgt/structvar.c
type_defs.c	Definitions for various low-level configuration types
type_defs.h	Header for lib/confmgt/type_defs.c
typedvar.c	Functions for accessing a pointer as an object of a given type
typedvar.h	Header for lib/confmgt/typedvar.c
unitparse.c	Functions for parsing values with units from a configuration file
unitparse.h	Header for lib/confmgt/unitparse.c
var_type_def_st.h	Structure declarations for typedvar type definitions
► container	Lib/container: Hash tables, dynamic arrays, bit arrays, etc
bitarray.h	Implements a variable-sized (but non-resizeable) bit-array
bloomfilt.c	Uses bitarray_t to implement a bloom filter
bloomfilt.h	Header for bloomfilt.c
handles.h	Macros for C weak-handle implementation
map.c	Hash-table implementations of a string-to-void* map, and of a digest-to-void* map
map.h	Headers for map.c
namemap.c	Mappings between identifiers and 16-bit ints
namemap.h	Header for namemap.c
namemap_st.h	Internal declarations for namemap structure
order.c	Functions for finding the n'th element of an array
order.h	Header for order.c
smartlist.c	Higher-level functions for the "smartlist" resizeable array abstraction
smartlist.h	Header for smartlist.c
► crypt_ops	Lib/crypt_ops: Cryptographic operations
aes.h	Headers for aes.c
aes_nss.c	Use NSS to implement AES_CTR
aes_openssl.c	Use OpenSSL to implement AES_CTR
compat_openssl.h
crypto_cipher.c	Symmetric cryptography (low-level) with AES
crypto_cipher.h	Headers for crypto_cipher.c
crypto_curve25519.c	Wrapper code for a curve25519 implementation
crypto_curve25519.h	Header for crypto_curve25519.c
crypto_dh.c	Block of functions related with DH utilities and operations. over Z_p. We aren't using this for any new crypto – EC is more efficient
crypto_dh.h	Headers for crypto_dh.c
crypto_dh_nss.c	NSS implementation of Diffie-Hellman over Z_p
crypto_dh_openssl.c	Implement Tor's Z_p diffie-hellman stuff for OpenSSL
crypto_digest.c	Block of functions related with digest and xof utilities and operations
crypto_digest.h	Headers for crypto_digest.c
crypto_digest_nss.c	Block of functions related with digest and xof utilities and operations (NSS specific implementations)
crypto_digest_openssl.c	Block of functions related with digest and xof utilities and operations (OpenSSL specific implementations)
crypto_ed25519.c	Wrapper code for an ed25519 implementation
crypto_ed25519.h	Header for crypto_ed25519.c
crypto_format.c	Formatting and parsing code for crypto-related data structures
crypto_format.h	Header for crypto_format.c
crypto_hkdf.c	Block of functions related with HKDF utilities and operations
crypto_hkdf.h	Headers for crypto_hkdf.h
crypto_init.c	Initialize and shut down Tor's crypto library and subsystem
crypto_init.h	Headers for crypto_init.c
crypto_nss_mgt.c	Manage the NSS library (if used)
crypto_nss_mgt.h	Headers for crypto_nss_mgt.c
crypto_ope.c	A rudimentary order-preserving encryption scheme
crypto_ope.h	Header for crypto_ope.c
crypto_openssl_mgt.c	Block of functions related to operations from OpenSSL
crypto_openssl_mgt.h	Headers for crypto_openssl_mgt.c
crypto_options.inc	Declare configuration options for the crypto_ops module
crypto_options_st.h	Header for lib/crypt_ops/crypto_options_st.c
crypto_pwbox.c	Code for encrypting secrets in a password-protected form and saving them to disk
crypto_pwbox.h	Header for crypto_pwbox.c
crypto_rand.c	Functions for initialising and seeding (pseudo-)random number generators, and working with randomness
crypto_rand.h	Common functions for using (pseudo-)random number generators
crypto_rand_fast.c	A fast strong PRNG for use when our underlying cryptographic library's PRNG isn't fast enough
crypto_rand_numeric.c	Functions for retrieving uniformly distributed numbers from our PRNGs
crypto_rsa.c	Block of functions related with RSA utilities and operations
crypto_rsa.h	Headers for crypto_rsa.c
crypto_rsa_nss.c
crypto_rsa_openssl.c
crypto_s2k.c	Functions for deriving keys from human-readable passphrases
crypto_s2k.h	Header for crypto_s2k.c
crypto_sys.h	Declare subsystem object for the crypto module
crypto_util.c	Common cryptographic utilities
crypto_util.h	Common functions for cryptographic routines
digestset.c	Implementation for a set of digests
digestset.h	Types to handle sets of digests, based on bloom filters
► ctime	Lib/ctime: Constant-time code to avoid side-channels
di_ops.c	Functions for data-independent operations
di_ops.h	Headers for di_ops.c
► defs	Lib/defs: Lowest-level constants, used in many places
dh_sizes.h	Definitions for sizes of Diffie-Hellman groups elements in Z_p
digest_sizes.h	Definitions for common sizes of cryptographic digests
logging_types.h	Global definition for types used by logging systems
time.h	Definitions for timing-related constants
x25519_sizes.h	Definitions for sizes of x25519 keys and elements
► dispatch	Lib/dispatch: In-process message delivery
dispatch.h	Low-level APIs for message-passing system
dispatch_cfg.c	Create and configure a dispatch_cfg_t
dispatch_cfg.h	Header for distpach_cfg.c
dispatch_cfg_st.h	Declarations for dispatch-configuration types
dispatch_core.c	Core module for sending and receiving messages
dispatch_naming.c	Name-to-ID maps for our message dispatch system
dispatch_naming.h	Header for dispatch_naming.c
dispatch_new.c	Code to construct a dispatch_t from a dispatch_cfg_t
dispatch_st.h	Private structures used for the dispatcher module
msgtypes.h	Types used for messages in the dispatcher code
► encoding	Lib/encoding: Encoding data in various forms, types, and transformations
binascii.c	Miscellaneous functions for encoding and decoding various things in base{16,32,64}
binascii.h	Header for binascii.c
confline.c	Functions to manipulate a linked list of key-value pairs, of the type used in Tor's configuration files
confline.h	Header for confline.c
cstring.c	Decode data that has been written as a C literal
cstring.h	Header for cstring.c
keyval.c	Handle data encoded as a key=value pair
keyval.h	Header for keyval.c
kvline.c	Manipulating lines of key-value pairs
kvline.h	Header for kvline.c
pem.c	Implement a trivial version of PEM encoding, for use with NSS
pem.h	Header for pem.c
qstring.c	Implement QuotedString parsing
qstring.h	Header for qstring.c
time_fmt.c	Encode and decode time in various formats
time_fmt.h	Header for time_fmt.c
► err	Lib/err: Lowest-level error handling code
backtrace.c	Functions to produce backtraces on bugs, crashes, or assertion failures
backtrace.h	Header for backtrace.c
torerr.c	Handling code for unrecoverable emergencies, at a lower level than the logging code
torerr.h	Headers for torerr.c
torerr_sys.c	Subsystem object for the error handling subsystem
torerr_sys.h	Declare subsystem object for torerr.c
► evloop	Lib/evloop: Low-level event loop
compat_libevent.c	Wrappers and utility functions for Libevent
compat_libevent.h	Header for compat_libevent.c
evloop_sys.c	Subsystem definition for the event loop module
evloop_sys.h	Declare subsystem object for the event loop module
procmon.c	Process-termination monitor functions
procmon.h	Headers for procmon.c
timers.c	Wrapper around William Ahern's fast hierarchical timer wheel implementation, to tie it in with a libevent backend
timers.h	Header for timers.c
token_bucket.c	Functions to use and manipulate token buckets, used for rate-limiting on connections and globally
token_bucket.h	Headers for token_bucket.c
workqueue.c	Implements worker threads, queues of work for them, and mechanisms for them to send answers back to the main thread
workqueue.h	Header for workqueue.c
► fdio	Lib/fdio: Code to read/write on file descriptors
fdio.c	Low-level compatibility wrappers for fd-based IO
fdio.h	Header for fdio.c
► fs	Lib/fs: Files, filenames, directories, etc
conffile.c
conffile.h	Read configuration files from disk, with full include support
dir.c	Read directories, and create directories with restrictive permissions
dir.h	Header for dir.c
files.c
files.h	Wrappers for reading and writing data to files on disk
freespace.c	Find the available disk space on the current volume
lockfile.c	Implements lock files to prevent two Tor processes from using the same data directory at the same time
lockfile.h	Header for lockfile.c
mmap.c	Cross-platform support for mapping files into our address space
mmap.h	Header for mmap.c
path.c	Manipulate strings that contain filesystem paths
path.h	Header for path.c
storagedir.c	An abstraction for a directory full of similar files
storagedir.h	Header for storagedir.c
userdb.c	Access the POSIX user database
userdb.h	Header for userdb.c
winlib.c	Find and load windows system libraries
winlib.h	Header for winlib.c
► geoip	Lib/geoip: IP-to-country mapping
country.h	Country type for geoip
geoip.c	Functions related to maintaining an IP-to-country database; to summarizing client connections by country to entry guards, bridges, and directory servers; and for statistics on answering network status requests
geoip.h	Header file for geoip.c
► intmath	Lib/intmath: Integer mathematics
addsub.c	Helpers for addition and subtraction
addsub.h	Header for addsub.c
bits.c	Count the bits in an integer, manipulate powers of 2, etc
bits.h	Header for bits.c
cmp.h	Macro definitions for MIN, MAX, and CLAMP
logic.h	Macros for comparing the boolean value of integers
muldiv.c	Integer math related to multiplication, division, and rounding
muldiv.h	Header for muldiv.c
weakrng.c	A weak but fast PRNG based on a linear congruential generator
weakrng.h	Header for weakrng.c
► llharden	Lib/llharden: low-level unconditional process hardening
winprocess_sys.c	Subsystem object for windows process setup
winprocess_sys.h	Declare subsystem object for winprocess.c
► lock	Lib/lock: Simple locking support
compat_mutex.c	Portable wrapper for platform mutex implementations
compat_mutex.h	Header for compat_mutex.c
compat_mutex_pthreads.c	Implement the tor_mutex API using pthread_mutex_t
compat_mutex_winthreads.c	Implement the tor_mutex API using CRITICAL_SECTION
► log	Lib/log: Log messages to files, syslogs, etc
escape.c	Escape untrusted strings before sending them to the log
escape.h	Header for escape.c
log.c	Functions to send messages to log files or the console
log.h	Headers for log.c
log_sys.c	Setup and tear down the logging module
log_sys.h	Declare subsystem object for the logging module
ratelim.c	Summarize similar messages that would otherwise flood the logs
ratelim.h	Summarize similar messages that would otherwise flood the logs
util_bug.c
util_bug.h	Macros to manage assertions, fatal and non-fatal
win32err.c	Convert windows error codes to useful C strings
win32err.h	Header for win32err.c
► malloc	Lib/malloc: Wrappers and utilities for memory management
malloc.c	Wrappers for C malloc code, and replacements for items that may be missing
malloc.h	Headers for util_malloc.c
map_anon.c	Manage anonymous mappings
map_anon.h	Headers for map_anon.c
► math	Lib/math: Floating-point math utilities
fp.c	Basic floating-point compatibility and convenience code
fp.h	Header for fp.c
laplace.c	Implements a Laplace distribution, used for adding noise to things
laplace.h	Header for laplace.c
prob_distr.c	Implements various probability distributions. Almost all code is courtesy of Riastradh
prob_distr.h	Header for prob_distr.c
stats.h	Header for stats.c
► memarea	Lib/memarea: A fast arena-style allocator
memarea.c	Implementation for memarea_t, an allocator for allocating lots of small objects that will be freed all at once
memarea.h	Header for memarea.c
► meminfo	Lib/meminfo: Inspecting system memory availability
meminfo.c	Functions to query total memory, and access meta-information about the allocator
meminfo.h	Header for meminfo.c
► metrics	Lib/metrics: Metrics collection API
metrics_common.c	Common code for the metrics library
metrics_common.h	Header for lib/metrics/metrics_common.c
metrics_store.c	Metrics interface to store them based on specific store type and get their MetricsPort output
metrics_store.h	Header for lib/metrics/metrics_store.c
metrics_store_entry.c	Metrics store entry which contains the gathered data
metrics_store_entry.h	Header for lib/metrics/metrics_store_entry.c
prometheus.c	Metrics format driver for Prometheus data model
prometheus.h	Header for feature/metrics/prometheus.c
► net	Lib/net: Low-level network-related code
address.c	Functions to use and manipulate the tor_addr_t structure
address.h	Headers for address.h
alertsock.c	Use a socket to alert the main thread from a worker thread
alertsock.h	Header for alertsock.c
buffers_net.c	Read and write data on a buf_t object
buffers_net.h	Header file for buffers_net.c
gethostname.c	Mockable wrapper for gethostname()
gethostname.h	Header for gethostname.c
inaddr.c	Convert in_addr and in6_addr to and from strings
inaddr.h	Header for inaddr.c
inaddr_st.h	Define in6_addr, its members, and related types on platforms that lack it
nettypes.h	Declarations for types used throughout the Tor networking system
network_sys.c	Subsystem object for networking setup
network_sys.h	Declare subsystem object for the network module
resolve.c	Use the libc DNS resolver to convert hostnames into addresses
resolve.h	Header for resolve.c
socket.c	Compatibility and utility functions for working with network sockets
socket.h	Header for socket.c
socketpair.c	Replacement socketpair() for systems that lack it
socketpair.h	Header for socketpair.c
socks5_status.h	Status codes used by the SOCKS5 protocol
► osinfo	Lib/osinfo: For inspecting the OS version and capabilities
libc.c	Functions to get the name and version of the system libc
libc.h	Header for lib/osinfo/libc.c
uname.c	Look up a description of the operating system
uname.h	Header for uname.c
► process	Lib/process: Launch and manage subprocesses
daemon.c	Run the tor process in the background (unix only)
daemon.h	Header for daemon.c
env.c	Inspect and manipulate the environment variables
env.h	Header for env.c
pidfile.c	Record this process's PID to disk
pidfile.h	Header for pidfile.c
process.c	Module for working with other processes
process.h	Header for process.c
process_sys.c	Subsystem object for process setup
process_sys.h	Declare subsystem object for the process module
process_unix.c	Module for working with Unix processes
process_unix.h	Header for process_unix.c
process_win32.c	Module for working with Windows processes
process_win32.h	Header for process_win32.c
restrict.c	Drop privileges from the current process
restrict.h	Header for restrict.c
setuid.c	Change the user ID after Tor has started (Unix only)
setuid.h	Header for setuid.c
waitpid.c	Convenience structures for handlers for handling waitpid()
waitpid.h	Headers for waitpid.c
► pubsub	Lib/pubsub: Publish-subscribe message passing
pub_binding_st.h	Declaration of pub_binding_t
pubsub.h	Header for OO publish-subscribe functionality
pubsub_build.c	Construct a dispatch_t in safer, more OO way
pubsub_build.h	Header used for constructing the OO publish-subscribe facility
pubsub_builder_st.h	Private structures used for configuring dispatchers and messages
pubsub_check.c	Enforce various requirements on a pubsub_builder
pubsub_connect.h	Header for functions that add relationships to a pubsub builder
pubsub_flags.h	Flags that can be set on publish/subscribe messages
pubsub_macros.h	Macros to help with the publish/subscribe dispatch API
pubsub_publish.c	Header for functions to publish using a pub_binding_t
pubsub_publish.h	Header for pubsub_publish.c
► sandbox	Lib/sandbox: Linux seccomp2-based sandbox
linux_syscalls.inc
sandbox.c	Code to enable sandboxing
sandbox.h	Header file for sandbox.c
► smartlist_core	Lib/smartlist_core: Minimal dynamic array implementation
smartlist_core.c	Implements the core functionality of a smartlist (a resizeable dynamic array). For more functionality and helper functions, see the container library
smartlist_core.h	Top-level declarations for the smartlist_t dynamic array type
smartlist_foreach.h	Macros for iterating over the elements of a smartlist_t
smartlist_split.c	Split a string into a smartlist_t of substrings
smartlist_split.h	Header for smartlist_split.c
► string	Lib/string: Low-level string manipulation
compat_ctype.c	Locale-independent character-type inspection (backend)
compat_ctype.h	Locale-independent character-type inspection (header)
compat_string.c	Useful string-processing functions that some platforms don't provide
compat_string.h	Header for compat_string.c
parse_int.c	Convert strings into the integers they encode, with bounds checking
parse_int.h	Header for parse_int.c
printf.c	Compatibility wrappers around snprintf and its friends
printf.h	Header for printf.c
scanf.c	Locale-independent minimal implementation of sscanf()
scanf.h	Header for scanf.c
util_string.c	Non-standard string functions used throughout Tor
util_string.h	Header for util_string.c
► subsys	Lib/subsys: Types for declaring a "subsystem"
subsys.h	Types used to declare a subsystem
► term	Lib/term: Terminal operations (password input)
getpass.c	Cross-platform wrapper to read passphrases from the terminal
getpass.h	Header for getpass.c
► testsupport	Lib/testsupport: Helpers for test-only code and for function mocking
testsupport.h	Macros to implement mocking and selective exposure for the test code
► thread	Lib/thread: Mid-level threading
compat_pthreads.c	Implementation for the pthreads-based multithreading backend functions
compat_threads.c	Cross-platform threading and inter-thread communication logic. (Platform-specific parts are written in the other compat_*threads modules.)
compat_winthreads.c	Implementation for the windows-based multithreading backend functions
numcpus.c	Compute the number of CPUs configured on this system
numcpus.h	Header for numcpus.c
thread_sys.h	Declare subsystem object for threads library
threads.h	Header for threads.c
► time	Lib/time: Higher-level time functions
compat_time.c	Portable wrappers for finding out the current time, running timers, etc
compat_time.h	Functions and types for monotonic times
time_sys.c	Subsystem object for monotime setup
time_sys.h	Declare subsystem object for the time module
tvdiff.c	Compute the difference between timevals, in various units
tvdiff.h	Header for tvdiff.c
► tls	Lib/tls: TLS library wrappers
buffers_tls.c	Read and write data on a tor_tls_t connection from a buf_t object
buffers_tls.h	Header for buffers_tls.c
ciphers.inc
nss_countbytes.c	A PRFileDesc layer to let us count the number of bytes bytes actually written on a PRFileDesc
nss_countbytes.h	Header for nss_countbytes.c, which lets us count the number of bytes actually written on a PRFileDesc
tortls.c	Shared functionality for our TLS backends
tortls.h	Headers for tortls.c
tortls_internal.h	Declare internal functions for lib/tls
tortls_nss.c	Wrapper functions to present a consistent interface to TLS and SSL X.509 functions from NSS
tortls_openssl.c
tortls_st.h	Structure declarations for internal TLS types
tortls_sys.h	Declare subsystem object for the tortls module
x509.c
x509.h	Headers for tortls.c
x509_internal.h
x509_nss.c	Wrapper functions to present a consistent interface to X.509 functions from NSS
x509_openssl.c	Wrapper functions to present a consistent interface to X.509 functions
► trace	Lib/trace: Function-tracing functionality API
► lttng
lttng.h	Header file for lttng.c
► usdt
usdt.h
debug.h	Macros for debugging our event-trace support
events.h	Header file for Tor tracing instrumentation definition
trace.c	Common functions for event-tracing implementation
trace.h	Header for trace.c
trace_stub.c	Stub declarations for use when trace library is disabled
trace_sys.c
trace_sys.h
► version	Lib/version: holds the current version of Tor
git_revision.c	Strings to describe the current Git commit
git_revision.h	Header for git_revision.c
torversion.h	Header for version.c
version.c	Functions to get the version of Tor
► wallclock	Lib/wallclock: Inspect and manipulate the current time
approx_time.c	Cache the last result of time(), for performance and testing
approx_time.h	Header for approx_time.c
time_to_tm.c	Convert to struct tm, portably
time_to_tm.h	Header for time_to_tm.c
timeval.h	Declarations for timeval-related macros that some platforms are missing
tor_gettimeofday.c	Implementat gettimeofday() for windows, and other platforms without it
tor_gettimeofday.h	Header for tor_gettimeofday.c
wallclock_sys.h	Declare subsystem object for the wallclock module
▼ tools	Tools: other command-line tools for use with Tor
tor-gencert.c
tor-print-ed-signing-cert.c
tor-resolve.c
tor_runner.c	Experimental module to emulate tor_run_main() API with fork+exec