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.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */</style><div class="highlight"><pre><span></span><span class="k">\subsubsection</span><span class="nb">{</span>Using the network scripts<span class="nb">}</span>

To be able to access the network functions, you need to include
the necessary shell scripts by running:

<span class="k">\begin</span><span class="nb">{</span>Verbatim<span class="nb">}</span>
. /etc/functions.sh      # common functions
include /lib/network     # include /lib/network/*.sh
scan<span class="nb">_</span>interfaces          # read and parse the network config
<span class="k">\end</span><span class="nb">{</span>Verbatim<span class="nb">}</span>

Some protocols, such as PPP might change the configured interface names
at run time (e.g. <span class="k">\texttt</span><span class="nb">{</span>eth0<span class="nb">}</span> =&gt; <span class="k">\texttt</span><span class="nb">{</span>ppp0<span class="nb">}</span> for PPPoE). That&#39;s why you have to run
<span class="k">\texttt</span><span class="nb">{</span>scan<span class="k">\_</span>interfaces<span class="nb">}</span> instead of reading the values from the config directly.
After running <span class="k">\texttt</span><span class="nb">{</span>scan<span class="k">\_</span>interfaces<span class="nb">}</span>, the <span class="k">\texttt</span><span class="nb">{</span>&#39;ifname&#39;<span class="nb">}</span> 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 <span class="k">\texttt</span><span class="nb">{</span>&#39;device&#39;<span class="nb">}</span>
option.
That means that running <span class="k">\texttt</span><span class="nb">{</span>config<span class="k">\_</span>get lan ifname<span class="nb">}</span>
after <span class="k">\texttt</span><span class="nb">{</span>scan<span class="k">\_</span>interfaces<span class="nb">}</span> might not return the same result as running it before.

After running <span class="k">\texttt</span><span class="nb">{</span>scan<span class="k">\_</span>interfaces<span class="nb">}</span>, the following functions are available:

<span class="k">\begin</span><span class="nb">{</span>itemize<span class="nb">}</span>
    <span class="k">\item</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>find<span class="k">\_</span>config <span class="k">\textit</span><span class="nb">{</span>interface<span class="nb">}}}</span> <span class="k">\\</span>
        looks for a network configuration that includes
        the specified network interface.

    <span class="k">\item</span><span class="nb">{</span><span class="k">\texttt</span><span class="nb">{</span>setup<span class="k">\_</span>interface <span class="k">\textit</span><span class="nb">{</span>interface [config] [protocol]<span class="nb">}}}</span> <span class="k">\\</span>
      will set up the specified interface, optionally overriding the network configuration
      name or the protocol that it uses.
<span class="k">\end</span><span class="nb">{</span>itemize<span class="nb">}</span>

<span class="k">\subsubsection</span><span class="nb">{</span>Writing protocol handlers<span class="nb">}</span>

You can add custom protocol handlers by adding shell scripts to
<span class="k">\texttt</span><span class="nb">{</span>/lib/network<span class="nb">}</span>. They provide the following two shell functions:

<span class="k">\begin</span><span class="nb">{</span>Verbatim<span class="nb">}</span>
scan<span class="nb">_</span>&lt;protocolname&gt;() <span class="nb">{</span>
    local config=&quot;<span class="s">$</span><span class="m">1</span><span class="nb">&quot;</span>
<span class="nb">    # change the interface names if necessary</span>
<span class="nb">}</span>

<span class="nb">setup_interface_&lt;protocolname&gt;</span><span class="o">()</span><span class="nb"> {</span>
<span class="nb">    local interface</span><span class="o">=</span><span class="nb">&quot;</span><span class="s">$</span>1&quot;
    local config=&quot;<span class="s">$</span><span class="m">2</span><span class="nb">&quot;</span>
<span class="nb">    # set up the interface</span>
<span class="nb">}</span>
<span class="nv">\end</span><span class="nb">{Verbatim}</span>

<span class="nv">\texttt</span><span class="nb">{scan</span><span class="nv">\_\textit</span><span class="nb">{protocolname}} is optional and only necessary if your protocol</span>
<span class="nb">uses a custom device, e.g. a tunnel or a PPP device.</span>
</pre></div>
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