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git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4853 3c298f89-4303-0410-b956-a3cf2f4a3e73
53 lines
1.7 KiB
Plaintext
53 lines
1.7 KiB
Plaintext
Structure of the network scripts in buildroot-ng
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1) Usage
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To be able to access the network functions, you need to include
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the necessary shell scripts by running:
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. /etc/functions.sh # common functions
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include /lib/network # include /lib/network/*.sh
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scan_interfaces # read and parse the network config
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Some protocols, such as PPP might change the configured interface names
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at run time (e.g. eth0 => ppp0 for PPPoE). That's why you have to run
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scan_interfaces instead of reading the values from the config directly.
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After running scan_interfaces, the 'ifname' option will always contain
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the effective interface name (which is used for IP traffic) and if the
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physical device name differs from it, it will be stored in the 'device'
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option.
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That means that running 'config_get lan ifname' after scan_interfaces
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might not return the same result as running it before.
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After running scan_interfaces, the following functions are available:
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- find_config <interface> looks for a network configuration that includes
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the specified network interface.
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- setup_interface <interface> [<config>] [<protocol>] will set up the
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specified interface, optionally overriding the network configuration
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name or the protocol that it uses.
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2) Writing protocol handlers
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You can add custom protocol handlers by adding shell scripts to
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/lib/network. They provide the following two shell functions:
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scan_<protocolname>() {
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local config="$1"
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# change the interface names if necessary
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}
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setup_interface_<protocolname>() {
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local interface="$1"
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local config="$2"
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# set up the interface
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}
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scan_<protocolname> is optional and only necessary if your protocol
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uses a custom device, e.g. a tunnel or a PPP device.
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