i2plib

i2plib is a modern asynchronous library for building I2P applications.

Installing

pip install i2plib

Requirements:

• Python version >= 3.5
• I2P router with SAM API enabled

Connecting to a remote I2P destination

import asyncio
import i2plib

async def connect_test(destination):
    session_name = "test-connect"

    # create a SAM stream session
    await i2plib.create_session(session_name)

    # connect to a destination
    reader, writer = await i2plib.stream_connect(session_name, destination)

    # write data to a socket
    writer.write(b"PING")

    # asynchronously receive data
    data = await reader.read(4096)
    print(data.decode())

    # close the connection
    writer.close()

# run event loop
loop = asyncio.get_event_loop()
loop.run_until_complete(connect_test("dummy.i2p"))
loop.stop()

Accept connections in I2P

import asyncio
import i2plib

async def accept_test():
    session_name = "test-accept"

    # create a SAM stream session
    await i2plib.create_session(session_name)

    # accept a connection
    reader, writer = await i2plib.stream_accept(session_name)

    # first string on a client connection always contains clients I2P destination
    dest = await reader.readline()
    remote_destination = i2plib.Destination(dest.decode().strip())

    # read for the actual incoming data from the client
    data = await reader.read(4096)

    print(data.decode())

    # send data back
    writer.write(b"PONG")

    # close the connection
    writer.close()

# run event loop
loop = asyncio.get_event_loop()
loop.run_until_complete(accept_test())
loop.stop()

Server tunnel

Expose a local service to I2P like that:

import asyncio
import i2plib

loop = asyncio.get_event_loop()
# making your local web server available in the I2P network
tunnel = i2plib.ServerTunnel(("127.0.0.1", 80))
asyncio.ensure_future(tunnel.run())

try:
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    loop.close()

Client tunnel

Bind a remote I2P destination to a port on your local host:

import asyncio
import i2plib

loop = asyncio.get_event_loop()
# bind irc.echelon.i2p to 127.0.0.1:6669
tunnel = i2plib.ClientTunnel("irc.echelon.i2p", ("127.0.0.1", 6669))
asyncio.ensure_future(tunnel.run())

try:
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    loop.close()

More examples

You can see more demo applications in docs/examples directory of the source repository.

Resources

• i2plib online documentation
• Invisible Internet Project
• SAM API documentation
• Python asyncio documentation

Aknowledgments

• i2p.socket, drop in python socket module that uses i2p
• txi2p, I2P bindings for Twisted
• leaflet, Dead simple I2P SAM library, written in Python 3