libcp2p

this is a work in progress

A libp2p-like protocol written in C with first class support for embedded systems. Goal is to be able to run in your fridge, arduinos, and any embedded system. Higher level languages will be done using FFI.

difference between libcp2p and libp2p

• Written in C
• Base58 replaced with base32
• Removal of built-in identify protocol
  • LibP2P is heavily reliant on the identify protocol and it is not possible to remove it
  • Redesigned so that identify is optional
• Protobuf replaced with cbor
• first class support for embedded systems
• higher level languages will use FFI instead of a language specific implementation

compatability with libp2p

• in theory there will be network level compatability
  • a libcp2p node would be able to open a connection to a libp2p node
  • this is in no way a design goal, nor a priority
• dht will not be compatible

features

multiformats

• multicodec
  • full encode/decode support for all codecs except 0xcert-imprint-256
• multiaddr
  • full multiaddr functionality
• multihash
  • basic multihash functionality, only supports SHAX-XXX, and Blake2B
• multibase
  • supports base16, base32, base64

peerstore

• Adds a peerstore to contain public key and peer identifier information
• Eventually will contain addressing information

networking

• TCP socket server
  • UDP has been tabled until we get a stable implementation of TCP
• Uses the multiaddress standard as the method of addressing other hosts
• Allows specifying two separate execution handlers whenever a new TCP connection is received
• todo:
  • enable secure connections
  • enable using peerIds

misc

• cid
  • basic support only
• protobuf support
  • basic support only
  • this will eventually be removed in favor of CBOR
• cryptography
  • ecdsa key management
  • sha1, sha256, sha512 hashing
  • misc other crypto functionality

installation

building

$> make # builds in release mode
$> make build-debug # builds in debug mode
$> make build-analysis # builds in static analysis mode

testing

$> cd build && ctest # runs regular tests
$> cd build && ctest -T memcheck # runs valgrind 

dependencies

• CMake >= 3.0
• GCC with support for C17
  • If you want to run static analysis, GCC-10 installed
• CMocka (testing dependency)
• Valgrind (dynamic analysis)
• clang-format (code formatting)
• doxygen (documentation generation)
• pthreads
• tinycbor
  • in repo using this commit

development/contribution

For instructions on development and contribution practices please see CONTRIBUTING.md

license

Certain libraries are copy&pasted from other open sources repositories are explicitly licensed under MIT or GPLv3. The code written for this lbirary specifically is licensed under AGPLv3. According to this stack overflow post this is acceptable. If you think this is not acceptable please open a github issue and we will make ammends