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Meyer link protocol
This document describes the Meyer linking protocol which is used to maintain server links in the dnet network and deliver data across the links.
Protocol
Every server maintains a list of connections (server, clients and unspec), this is the DConnection[] array. What we are concerned with here is the subset of that array which has ConnectionType.SERVER (so all servers).
We also maintain a list of all servers that we know of via links, this is called sl and normally written in the notation of sl=[]. Some of these elements will be servers in DConnection[] (direct) however not all will be (indirect).
Link request
A link request is when Server B makes a request to Server A to link up (Server B -> Server A) then the following happens.
Server A checks its sl=[] and checks if the announced server name by Server B is in it, if so it closes the request as they must be linked already directly or indirectly.
However, if not then it will add B to its sl=[], so now it is sl=[B]. Another thing to note is when Server B makes the request (regardless of if it will go through or not), it will
WHen a server wants to link with another it sends a lin request containing:
- it's server name
- a list of the links it has (direct and indirect)
The receiving server checks first of all if