GENERAL INFORMATION

A set of turnutils_* programs provides some utility functionality to be used
for testing and for setting up the TURN server. 
  
1.	turnutils_uclient: emulates multiple UDP,TCP,TLS or DTLS clients. 
(this program is provided for the testing purposes only !)
The compiled binary image of this program is located in bin/ 
sub-directory.

WARNING: the turnutils_uclient program is a primitive client application. 
It does not implement the re-transmission pattern that is necessary for 
a correct TURN client implementation. In TURN, the retransmission burden 
is lying almost entirely on the client application. We provide the messaging 
functionality in the client library, but the client must implement 
the correct Networking IO processing in the client program code.

2.	turnutils_peer: a simple stateless UDP-only "echo" server, 
to be used as the final server in relay pattern ("peer"). For every incoming 
UDP packet, it simply echoes it back.
(this program is provided for the testing purposes only !) 
When the test clients are communicating in the client-to-client manner 
(when the "turnutils_uclient" program is used with "-y" option) then the 
turnutils_peer is not needed.
	
The compiled binary image of this program is located in bin/ subdirectory.
   
3.	turnutils_stunclient: a simple STUN client example. 
The compiled binary image of this program is located in bin/ subdirectory.
  
4.	turnutils_rfc5769check: a utility that checks the correctness of the 
STUN/TURN protocol implementation. This utility is used only for the compilation
check procedure, it is not copied to the installation destination.


In the "examples/scripts" subdirectory, you will find the examples of command lines to be used 
to run the programs. The scripts are meant to be run from examples/ subdirectory, for example:

$ cd examples

$ ./scripts/secure_relay.sh

=====================================
    
  NAME
  
turnutils_uclient - this client emulation application is supplied for the test purposes only.
 
  SYNOPSIS  

$ turnutils_uclient [-tTSvsyhcxg] [options] <TURN-Server-IP-address>
  
  DESCRIPTION
  
It was designed to simulate multiple clients. It uses asynch IO API in 
libevent to handle multiple clients. A client connects to the relay, 
negotiates the session, and sends multiple (configured number) messages to the server (relay), 
expecting the same number of replies. The length of the messages is configurable. 
The message is an arbitrary octet stream, but it can be configured as a string. 
The number of the messages to send is configurable.

Flags:   

-t      Use TCP for communications between client and TURN server (default is UDP).

-T      Use TCP for the relay transport (default - UDP). Implies options -t, -y, -c, 
    	and ignores flags and options -s, -e, -r and -g.
    	
-P      Passive TCP (RFC6062 with active peer). Implies -T.

-S      Secure SSL connection: SSL/TLS for TCP, DTLS for UDP.

-U      Secure unencrypted connection (suite eNULL): SSL/TLS for TCP, DTLS for UDP.

-v      Verbose.

-s      Use "Send" method in TURN; by default, it uses TURN Channels.

-y      Use client-to-client connections: 
    	RTP/RTCP pair of channels to another RTP/RTCP pair of channels.
    	with this option the turnutils_peer application is not used,
    	as the allocated relay endpoints are talking to each other.
    	 
-h      Hang on indefinitely after the last sent packet.

-c      Do not create rtcp connections.

-x      Request IPv6 relay address (RFC6156).

-X	IPv4 relay address explicitly requested.

-g      Set DONT_FRAGMENT parameter in TURN requests.

-A	use short-term credentials mechanism for authentication. 
	By default, the program uses the long-term credentials mechanism 
	if authentication is required.

-D	Do mandatory channel padding even for UDP (like pjnath).

-N	do negative tests (some limited cases only).

-R	do negative protocol tests.

-O	DOS attack mode.

-H	SHA256 digest function for message integrity calculation.
	Without this option, by default, SHA1 is used.
		
-M	Use TURN ICE Mobility.

-I	Do not set permissions on TURN relay endpoints
	(for testing the non-standard server relay functionality).
		
-G	Generate extra requests (create permissions, channel bind).

Options with required values:  

-l      Message length (Default: 100 Bytes).

-i      Certificate file (for secure connections only, optional).

-k      Private key file (for secure connections only).

-E	CA file for server certificate verification,
	if the server certificate to be verified.

-p      TURN Server port (Defaults: 3478 unsecure, 5349 secure).

-n      Number of messages to send (Default: 5).

-d      Local interface device (optional, Linux only).

-L      Local IP address (optional).

-m      Number of clients (Default: 1, 2 or 4, depending on options).

-e      Peer address.

-r      Peer port (Default: 3480).

-z      Per-session packet interval in milliseconds (Default: 20).

-u      STUN/TURN user name.

-w      STUN/TURN user password.

-W      TURN REST API authentication secret. Is not compatible with -A flag.

-C	This is the username/timestamp separator symbol (character) in 
	TURN REST API. The default value is :.

-F	Cipher suite for TLS/DTLS. Default value is DEFAULT.

See the examples in the "examples/scripts" directory.

======================================
  
  NAME
    
turnutils_peer - a simple UDP-only echo backend server.  
  
  SYNOPSYS

$ turnutils_peer [-v] [options]
  
  DESCRIPTION
  
This application is used for the test purposes only, as a peer for the turnutils_uclient application.

Options with required values:  

-p  Listening UDP port (Default: 3480).
 
-d  Listening interface device (optional)

-L  Listening address of turnutils_peer server. Multiple listening addresses can be used, IPv4 and IPv6.
If no listener address(es) defined, then it listens on all IPv4 and IPv6 addresses.

-v  Verbose

========================================

  NAME
  
turnutils_stunclient -  a basic STUN client. 
  
  SYNOPSIS

$ turnutils_stunclient [options] <STUN-Server-IP-address>
  
  DESCRIPTION
  
It sends a "new" STUN RFC 5389 request (over UDP) and shows the reply information.

Options with required values:  

-p  STUN server port (Default: 3478).
 
-L  Local address to use (optional).

-f  Force RFC 5780 processing.

The turnutils_stunclient program checks the results of the first request, 
and if it finds that the STUN server supports RFC 5780 
(the binding response reveals that) then the turnutils_stunclient makes a couple more 
requests with different parameters, to demonstrate the NAT discovery capabilities.

This utility does not support the "old" "classic" STUN protocol (RFC 3489).
  
=====================================

  NAME
  
turnutils_rfc5769check - a utility that tests the correctness of STUN protocol implementation.   
  
  SYNOPSIS
  
  $ turnutils_rfc5769check
  
  DESCRIPTION

turnutils_rfc5769check tests the correctness of STUN protocol implementation 
against the test vectors predefined in RFC 5769 and prints the results of the 
tests on the screen. This utility is used only for the compilation
check procedure, it is not copied to the installation destination.
	
Usage:  

$ turnutils_rfc5769check

===================================
 
DOCS

After installation, run the command:

$ man turnutils

or in the project root directory:

$ man -M man turnutils

to see the man page.

=====================================

FILES

/etc/turnserver.conf

/etc/turnuserdb.conf

/usr/local/etc/turnserver.conf

/usr/local/etc/turnuserdb.conf

=================================

DIRECTORIES

/usr/local/share/turnserver

/usr/local/share/doc/turnserver

/usr/local/share/examples/turnserver

===================================

STANDARDS

new STUN RFC 5389

TURN RFC 5766

TURN-TCP extension RFC 6062
 
TURN IPv6 extension RFC 6156

STUN/TURN test vectors RFC 5769

STUN NAT behavior discovery RFC 5780

====================================

SEE ALSO

	turnserver, turnadmin

======================================

  WEB RESOURCES

	project page:

	http://code.google.com/p/rfc5766-turn-server/

	Wiki page:

	http://code.google.com/p/rfc5766-turn-server/wiki/Readme

	forum:

	https://groups.google.com/forum/?fromgroups=#!forum/turn-server-project-rfc5766-turn-server/

======================================

  AUTHORS

	Oleg Moskalenko <mom040267@gmail.com>

	Gabor Kovesdan http://kovesdan.org/

	Daniel Pocock http://danielpocock.com/

	John Selbie (jselbie@gmail.com)

	Lee Sylvester <lee@designrealm.co.uk>

	Erik Johnston <erikj@openmarket.com>

	Roman Lisagor <roman@demonware.net>
	
	Vladimir Tsanev <tsachev@gmail.com>
	
	Po-sheng Lin <personlin118@gmail.com>
	
	Peter Dunkley <peter.dunkley@crocodilertc.net>
	
	Mutsutoshi Yoshimoto <mutsutoshi.yoshimoto@mixi.co.jp>
