I2P tunnel configuration
========================
Overview
--------
tunnels.conf is designed to support multiple I2P tunnels. Must be located in ``~/.i2pd`` (per-user) or ``/var/lib/i2pd`` (system-wide).
This file uses .ini file format. It consists of multiple sections with unique name each.
Tunnel types
------------
Section type is specified by *type* parameter.
Available tunnel types:
Type | Description
------------- | --------------------------------------
client | Client tunnel to remote I2P destination (TCP)
server | Generic server tunnel to setup any TCP service in I2P network
http | HTTP server tunnel to setup a website in I2P
irc | IRC server tunnel to setup IRC server in I2P
udpclient | Forwards local UDP endpoint to remote I2P destination
udpserver | Forwards traffic from N I2P destinations to local UDP endpoint
socks | Custom Socks proxy service to use I2P with
httpproxy | Custom HTTP proxy service to use I2P with
websocks | WebSocket interface to use I2P with
Client tunnels
--------------
Mnemonic: we can connect to someone as client
Must contain few mandatory parameters, some optional parameters might be also presented.
Example of client tunnel:
[irc-out]
type = client
address = 127.0.0.1
port = 6668
destination = irc.echelon.i2p
keys = irc.dat
If *keys* is empty, transient keys will be created on every restart. If keys file is not found, new keys will be created and stored into specified file. If *keys* is equal to *transient* , new keys will be created, but not stored into a file.
Client tunnels might share same local destination, if keys file contains same identity.
Optional parameters:
* address -- local interface tunnel binds to, '127.0.0.1' for connections from local host only, '0.0.0.0' for connections from everywhere. '127.0.0.1' by default.
* signaturetype -- signature type for new keys. 0 (DSA), 1 (ECDSA-P256), 7 (EDDSA). 1 by default
* crytotype -- crypto type for new keys. Experimental. Should be alway 0
* destinationport -- connect to particular port at destination. 0 by default
So, with example above, if you telnet to 127.0.0.1:6668 on localhost, i2pd will connect to irc.echelon.i2p:6668
Server/generic tunnels
----------------------
Mnemonic: we serving some service to others in network
Example of server tunnel:
[smtp-in]
type = server
host = 127.0.0.1
port = 25
keys = smtp-in.dat
*keys* must be presented, LeaseSet of address from keys file will be published. Server tunnel must use its own local destination.
Optional parameters:
* inport -- what port at local destination server tunnel listens to. Same as *port* by default.
* accesslist -- list of comma-separated of b32 address (without .b32.i2p) allowed to connect. Everybody is allowed by default.
* gzip -- turns internal compression off if set to false. true by default.
* signaturetype -- means signature type for new keys. 0 - DSA, 1- ECDSA-P256, 7 -EDDSA. 1 by default.
* crytotype -- crypto type for new keys. Experimental. Should be alway 0.
* enableuniquelocal -- if true, connection to local address will look like 127.x.x.x where x.x.x is first 3 bytes of incoming connection peer's ident hash. true by default.
Server/http tunnels
-------------------
*http* tunnel works same way as server tunnel, but replace 'Host:' field in HTTP header to address provided in configuration.
Also resolves it if necessary.
Example of http tunnel:
[http-in]
type = http
host = ourwebsite.com
port = 80
keys = our-website.dat
Optional parameters:
* hostoverride -- value to send in 'Host:' header, default: the same as *host* parameter
* gzip -- should we compress contents at I2P level. default: true
Server/IRC tunnels
-------------------
IRC tunnels are supposed to connect to an IRC server through WEBIRC.
It replaces IP address (usually 127.0.0.1) to user's .b32 I2P address.
Optional parameters:
* webircpassword -- password to send with WEBIRC command
UDP Tunnels
-----------
There are 2 types of UDP tunnels: `udpclient` and `udpserver`
`udpclient` forwards 1 local UDP endpoint to 1 remote I2P destination
[openvpn-client-simple]
type = udpclient
destination = something.b32.i2p
port = 1194
* destination -- the I2P destination of a udpserver tunnel, required parameter
* address -- IP address to bind local UDP endpoint to, defaults to `127.0.0.1`
* port -- port to bind local UDP endpoint to, required parameter
`udpserver` forwards traffic from N I2P destinations to 1 local UDP endpoint
[openvpn-simple-server]
type = udpserver
keys = openvpn.dat
port = 1194
* address -- IP address to use for local UDP endpoints, defaults to `127.0.0.1`
* host -- IP address to forward traffic to, defaults to `127.0.0.1`
* port -- UDP port to forward traffic on, required parameter
Socks proxy
-----------
Socks proxy interface can be defined in ``tunnels.conf``.
Example of Socks proxy:
[alt-socks]
type = socks
address = 127.0.0.1
port = 14447
keys = socks-keys.dat
* address -- local address Socks proxy binds to, defaults to `127.0.0.1`
* port -- TCP port Socks proxy binds to
I2CP parameters
---------------
I2CP parameter are common for all tunnel types and specify setting for a local destination.
* inbound.length -- number of hops of an inbound tunnel. 3 by default; lower value is faster but dangerous
* outbound.length -- number of hops of an outbound tunnel. 3 by default; lower value is faster but dangerous
* inbound.quantity -- number of inbound tunnels. 5 by default
* outbound.quantity -- number of outbound tunnels. 5 by default
* crypto.tagsToSend -- number of ElGamal/AES tags to send. 40 by default; too low value may cause problems with tunnel building
* explicitPeers -- list of comma-separated b64 addresses of peers to use, default: unset
* i2p.streaming.initialAckDelay -- milliseconds to wait before sending Ack. 200 by default
Other examples
--------------
# outgoing tunnel sample, to remote service
# mandatory parameters:
# * type -- always "client"
# * port -- local port to listen to
# * destination -- I2P hostname
# optional parameters (may be omitted)
# * keys -- our identity, if unset, will be generated on every startup,
# if set and file missing, keys will be generated and placed to this file
# * address -- local interface to bind
# * signaturetype -- signature type for new destination. 0 (DSA/SHA1), 1 (EcDSA/SHA256) or 7 (EdDSA/SHA512)
[IRC]
type = client
address = 127.0.0.1
port = 6668
destination = irc.postman.i2p
keys = irc-keys.dat
#
# incoming tunnel sample, for local service
# mandatory parameters:
# * type -- "server" or "http"
# * host -- IP address of our service
# * port -- port of our service
# * keys -- file with LeaseSet of address in i2p
# optional parameters (may be omitted)
# * inport -- optional, I2P service port, if unset - the same as 'port'
# * accesslist -- comma-separated list of I2P addresses, allowed to connect
# every address is b32 without '.b32.i2p' part
[LOCALSITE]
type = http
host = 127.0.0.1
port = 80
keys = site-keys.dat
#
[IRC-SERVER]
type = server
host = 127.0.0.1
port = 6667
keys = irc.dat
