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authorJo-Philipp Wich <jow@openwrt.org>2014-06-11 12:37:19 +0000
committerJo-Philipp Wich <jow@openwrt.org>2014-06-11 12:37:19 +0000
commit91b97bc9f625d09431dc1c753209a037d7c42fbc (patch)
tree428230e6d8f0d7ac47dcccebabccd09667d58ea5 /libs/lucid/docs/OVERVIEW
parent2d05a6135a0d29a82148f9bfc215b2de5b609dd5 (diff)
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- LuCId Network Superserver in Lua
-
-*** Abstract ***
-LuCId is a network superserver written in Lua based on the nixio POSIX library.
-It supports IPv4, IPv6, TLS, asynchronous and synchronous IO and can be extended
-to handle any kind of IO events on file descriptors. LuCId is also able to
-generate RSA private keys and self-signed certificates on demand if the px5g
-keymaster library is available. Both nixio and px5g are libraries created
-by the LuCI developers.
-
-
-*** Configuration ***
-LuCId uses the UCI Universal Configuration Interface as configuration backend.
-
-There are 4 types of configuration sections and one named section defined:
-The main section of type "lucid" defines the basic framework parameters of LuCId
-These include:
- * pollinterval: Internal polling interval
- * threadlimit: Overall maximum number of child processes
- * daemonize: Whether to daemonize at startup
- * debug: Whether to enable debug output in syslog
-
-
-The "tcpserver" section type provides the framework for TCP servers:
-Parameters:
- * entrypoint: Lua module entrypoint (provides a prepare_daemon function)
-
-The "daemon" sections define instances of servers.
-Parameters may include:
- * slave: Server slave
- * publisher: Publishers to be served by this daemon
- * enabled: Flag (0/1) whether this daemon should be started
- * address: List of ports / addresses to be bound too, if applicable
- * encryption: Flag (disabled/enabled) whether to enforce encryption
- * tls: Reference to the TLS configuration section to use
-
-The "...Publisher" sections define services to be published through daemons.
-Publishers definitions should be daemon and protocol independent whenever
-possible. Publishers should also implement access restrictions for certain
-network interfaces and for specified UNIX user accounts.
-Publishers usually define but are not required to use the following Parameters:
- * name: Published Name
- * physical: Physical source path
- * virtual: Virtual resource path
- * domain: Any kind of domain or realm specification
- * read: ACL containing entities allowed to read the given resource
- * write: -"-
- * exec: -"-
-
-The "tls" sections describe TLS security specifications for TCP servers.
-Parameters:
- * key: Private Key file
- * cert: Certificate file
- * type: Type of certificate and key files (pem, asn1)
- * generate: Flag (0/1) to determine whether LuCId should generate
- keys and self-signed certificates if the certificate is not available and
- the px5g RSA Keymaster is available
-
-
-
-*** Workflow ***
-In the preparation phase LuCId loads its configuration using the specification
-given above and prepares its servers, daemons and publishers. It also allocates
-resources such as binding sockets or preparing encryption credentials.
-If everything could be setup correctly LuCId will daemonize - if requested. If
-any errors occur in the preparation phase, LuCId will write to the system logger
-and exit.
-
-After daemonizing the main process is responsible for keeping a list of
-file descriptors that LuCId is polling regularly to handle incoming data events.
-Data events are for example new TCP connection attempts which could cause the
-superserver to fork a new process and invoke a registered handler.
-
-Whenever a sub-process is about to be generate LuCId checks if given resource
-limits are still met. \ No newline at end of file