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| -rw-r--r-- | docs/network-scripts.txt | 52 |
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diff --git a/docs/network-scripts.txt b/docs/network-scripts.txt new file mode 100644 index 000000000..30087cfce --- /dev/null +++ b/docs/network-scripts.txt @@ -0,0 +1,52 @@ + Structure of the network scripts in buildroot-ng + + +1) Usage + +To be able to access the network functions, you need to include +the necessary shell scripts by running: + +. /etc/functions.sh # common functions +include network # include /lib/network/*.sh +scan_interfaces # read and parse the network config + +Some protocols, such as PPP might change the configured interface names +at run time (e.g. eth0 => ppp0 for PPPoE). That's why you have to run +scan_interfaces instead of reading the values from the config directly. +After running scan_interfaces, the '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 'device' +option. +That means that running 'config_get lan ifname' after scan_interfaces +might not return the same result as running it before. + +After running scan_interfaces, the following functions are available: + +- find_config <interface> looks for a network configuration that includes + the specified network interface. + +- setup_interface <interface> [<config>] [<protocol>] will set up the + specified interface, optionally overriding the network configuration + name or the protocol that it uses. + + + +2) Writing protocol handlers + +You can add custom protocol handlers by adding shell scripts to +/lib/network. They provide the following two shell functions: + +scan_<protocolname>() { + local config="$1" + # change the interface names if necessary +} + +setup_interface_<protocolname>() { + local interface="$1" + local config="$2" + # set up the interface +} + +scan_<protocolname> is optional and only necessary if your protocol +uses a custom device, e.g. a tunnel or a PPP device. + |