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+LuCI provides some of its libraries to external applications through a JSON-RPC API.
+This Howto shows how to use it and provides information about available functions.
+
+
+# Basics
+LuCI comes with an efficient JSON De-/Encoder together with a JSON-RPC-Server which implements the *JSON-RPC 1.0_' and 2.0 (partly) specifications. The LuCI JSON-RPC server offers several independent APIs. Therefore you have to use '_different URLs for every exported library*.
+Assuming your LuCI-Installation can be reached through */cgi-bin/luci_' any exported library can be reached via '''/cgi-bin/luci/rpc/''LIBRARY_*.
+
+
+# Authentication
+Most exported libraries will require a valid authentication to be called with. If you get an *HTTP 403 Forbidden_' status code you are probably missing a valid authentication token. To get such a token you have to call the function '''login''' of the RPC-Library '''auth'''. Following our example from above this login function would be provided at '_/cgi-bin/luci/rpc/auth*. The function accepts 2 parameters: username and password (of a valid user account on the host system) and returns an authentication token.
+
+If you want to call any exported library which requires an authentication token you have to *append it as an URL parameter _auth''''' to the RPC-Server URL. So instead of calling '''/cgi-bin/luci/rpc/''LIBRARY''''' you have to call '''/cgi-bin/luci/rpc/''LIBRARY''?auth=''TOKEN_*.
+
+If your JSON-RPC client is Cookie-aware (like most browsers are) you will receive the authentication token also with a session cookie and probably don't have to append it to the RPC-Server URL.
+
+
+# Exported Libraries
+## uci
+The UCI-Library */rpc/uci* offers functionality to interact with the Universal Configuration Interface.
+*Exported Functions:*
+* [(string) add(config, type)](http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.add)
+* [(integer) apply(config)](http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.apply)
+* [http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.changes (object) changes([config])]
+* [(boolean) commit(config)](http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.commit)
+* [http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.delete (boolean) delete(config, section[, option])]
+* [http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.delete_all (boolean) delete_all(config[, type])]
+* [http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.foreach (array) foreach(config[, type])]
+* [http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.get (mixed) get(config, section[, option])]
+* [http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.get_all (object) get_all(config[, section])]
+* [http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.get (mixed) get_state(config, section[, option])]
+* [(boolean) revert(config)](http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.revert)
+* [(name) section(config, type, name, values)](http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.section)
+* [(boolean) set(config, section, option, value)](http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.set)
+* [(boolean) tset(config, section, values)](http://luci.subsignal.org/api/luci/modules/luci.model.uci.html#Cursor.tset)
+
+## uvl
+The UVL-Library */rpc/uvl* offers functionality to validate UCI files and get schemes describing UCI files.
+*Exported Functions:*
+* [(array) get_scheme(scheme)](http://luci.subsignal.org/api/luci/modules/luci.uvl.html#UVL.get_scheme)
+* [(array) validate(config, section, option)](http://luci.subsignal.org/api/luci/modules/luci.uvl.html#UVL.validate)
+* [(array) validate_config(config)](http://luci.subsignal.org/api/luci/modules/luci.uvl.html#UVL.validate_config)
+* [(array) validate_section(config, section)](http://luci.subsignal.org/api/luci/modules/luci.uvl.html#UVL.validate_section)
+* [(array) validate(config, section, option)](http://luci.subsignal.org/api/luci/modules/luci.uvl.html#UVL.validate_option)
+
+## fs
+The Filesystem library */rpc/fs* offers functionality to interact with the filesystem on the host machine.
+*Exported Functions:*
+
+* [Complete luci.fs library](http://luci.subsignal.org/api/luci/modules/luci.fs.html)
+*Note:* All functions are exported as they are except for _readfile'' which encodes its return value in base64 and ''writefile'' which only accepts base64 encoded data as second argument. Note that both functions will only be available when the ''luasocket_ packet is installed on the hostsystem.
+
+## sys
+The System library */rpc/sys* offers functionality to interact with the operating system on the host machine.
+*Exported Functions:*
+* [Complete luci.sys library](http://luci.subsignal.org/api/luci/modules/luci.sys.html)
+* [Complete luci.sys.group library](http://luci.subsignal.org/api/luci/modules/luci.sys.group.html) with prefix *group.*
+* [Complete luci.sys.net library](http://luci.subsignal.org/api/luci/modules/luci.sys.net.html) with prefix *net.*
+* [Complete luci.sys.process library](http://luci.subsignal.org/api/luci/modules/luci.sys.process.html) with prefix *process.*
+* [Complete luci.sys.user library](http://luci.subsignal.org/api/luci/modules/luci.sys.user.html) with prefix *user.*
+* [Complete luci.sys.wifi library](http://luci.subsignal.org/api/luci/modules/luci.sys.wifi.html) with prefix *wifi.*
+
+## ipkg
+The IPKG library */rpc/ipkg* offers functionality to interact with the package manager (IPKG or OPKG) on the host machine.
+*Exported Functions:*
+* [Complete luci.model.ipkg library](http://luci.subsignal.org/api/luci/modules/luci.model.ipkg.html)
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