Welcome to Tor codebase’s documentation!

Contents:

• Overview
  • The very high level
  • Some key high-level abstractions
  • The rest of this document.
• Utility code in Tor
  • Compatibility code
  • Containers
  • Cryptography
• Memory management
  • Heap-allocation functions
  • Grow-only memory allocation: memarea.c
• Collections in tor
  • Smartlists: Neither lists, nor especially smart.
  • Digest maps, string maps, and more.
  • Intrusive lists and hashtables
• Time in tor
  • What time is it?
  • Cached views of time.
  • Parsing and encoding time values
  • Scheduling events
• Lower-level cryptography functionality in Tor
  • RNG facilities
  • Cryptographic digests and related functions
  • Stream ciphers
  • Public key functionality
  • Metaformats for storage
  • Boxed-file storage
  • Certificates
  • TLS
• OS compatibility functions
  • The filesystem
  • Networking
  • Process launch and monitoring
• Threads in Tor
• String processing in Tor
  • Comparing strings and memory chunks
  • Parsing text
  • Generating blocks of text
  • Logging helpers
• Data flow in the Tor process
  • Connections and buffers: reading, writing, and interpreting.
  • From connections to channels
  • From channels through circuits
  • Sending cells on circuits: the complicated bit.
• Tor’s modules
  • Generic modules
  • Node-status modules
  • Client modules
  • Server modules
  • Onion service modules
  • Authority modules
  • Miscellaneous modules
• This not that