From 550f17100a5e15f9a5ac96c2923e258c786ac454 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Fri, 13 Oct 2006 22:41:34 +0000
Subject: add initial version of our new documentation - not too pretty yet,
 but will be improved

SVN-Revision: 5060
---
 docs/network-scripts.tex | 54 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 docs/network-scripts.tex

(limited to 'docs/network-scripts.tex')

diff --git a/docs/network-scripts.tex b/docs/network-scripts.tex
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+\subsubsection{Using the network scripts}
+
+To be able to access the network functions, you need to include
+the necessary shell scripts by running:
+
+\begin{Verbatim}
+. /etc/functions.sh      # common functions
+include /lib/network     # include /lib/network/*.sh
+scan_interfaces          # read and parse the network config
+\end{Verbatim}
+
+Some protocols, such as PPP might change the configured interface names
+at run time (e.g. \texttt{eth0} => \texttt{ppp0} for PPPoE). That's why you have to run
+\texttt{scan\_interfaces} instead of reading the values from the config directly.
+After running \texttt{scan\_interfaces}, the \texttt{'ifname'} option will always contain
+the effective interface name (which is used for IP traffic) and if the
+physical device name differs from it, it will be stored in the \texttt{'device'}
+option.
+That means that running \texttt{config\_get lan ifname}
+after \texttt{scan\_interfaces} might not return the same result as running it before.
+
+After running \texttt{scan\_interfaces}, the following functions are available:
+
+\begin{itemize}
+	\item{\texttt{find\_config \textit{interface}}} \\
+		looks for a network configuration that includes
+  		the specified network interface.
+
+	\item{\texttt{setup\_interface \textit{interface [config] [protocol]}}} \\
+	  will set up the specified interface, optionally overriding the network configuration
+	  name or the protocol that it uses.
+\end{itemize}
+
+\subsubsection{Writing protocol handlers}
+
+You can add custom protocol handlers by adding shell scripts to
+\texttt{/lib/network}. They provide the following two shell functions:
+
+\begin{Verbatim}
+scan_<protocolname>() {
+	local config="$1"
+	# change the interface names if necessary
+}
+
+setup_interface_<protocolname>() {
+	local interface="\$1"
+	local config="\$2"
+	# set up the interface
+}
+\end{Verbatim}
+
+\texttt{scan\_\textit{protocolname}} is optional and only necessary if your protocol
+uses a custom device, e.g. a tunnel or a PPP device.
+
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