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1bca4f6f03
The new protocol adds support for protocol version and exchanges the
socket type, so that the library can reject a connection when the
sockets do not match.
The protocol was designed so that it's possible to detect and fully
support ZTP/1.0 peers.
When a new connection is set up, peers exchange greeting messages. The
greeting message encodes both the protocol verion and the socket type.
The format of the greeting message is as follows:
greeting = tag1, adaptation, tag2, version, length, socket_type
tag1 = BYTE / 0xff
adaptation = 8 BYTES
tag2 = BYTE / 0x7f
version = BYTE / 1
length = BYTE / 1
socket_type = BYTE
The protocol does not define the value of adaptation field.
When interoperability with ZTP/1.0 peers is required, the adaptaion
encodes, in network byte order, the length of identity message increased
by 1. When adaptaion consists of eight zeros, the current
implementatatio of 0MQ 2.x closes the connection.
This patch supports both ZTP/1.0 and new protocol.
Welcome ------- The 0MQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialised messaging middleware products. 0MQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more. Building and installation ------------------------- See the INSTALL file included with the distribution. Resources --------- Extensive documentation is provided with the distribution. Refer to doc/zmq.html, or "man zmq" after you have installed 0MQ on your system. Website: http://www.zeromq.org/ Development mailing list: zeromq-dev@lists.zeromq.org Announcements mailing list: zeromq-announce@lists.zeromq.org Git repository: http://github.com/zeromq/libzmq 0MQ developers can also be found on the IRC channel #zeromq, on the Freenode network (irc.freenode.net). Copying ------- Free use of this software is granted under the terms of the GNU Lesser General Public License (LGPL). For details see the files `COPYING` and `COPYING.LESSER` included with the 0MQ distribution.