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<h1>luaposix 36.3</h1>


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  <li><a href="../index.html">Index</a></li>
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<h2>Examples</h2>
<ul class="nowrap">
  <li><a href="../examples/abstract-ns-client.lua.html">abstract-ns-client.lua</a></li>
  <li><a href="../examples/abstract-ns-server.lua.html">abstract-ns-server.lua</a></li>
  <li><a href="../examples/dir.lua.html">dir.lua</a></li>
  <li><a href="../examples/dup2.lua.html">dup2.lua</a></li>
  <li><a href="../examples/fork.lua.html">fork.lua</a></li>
  <li><a href="../examples/fork2.lua.html">fork2.lua</a></li>
  <li><a href="../examples/getopt.lua.html">getopt.lua</a></li>
  <li><a href="../examples/glob.lua.html">glob.lua</a></li>
  <li><a href="../examples/limit.lua.html">limit.lua</a></li>
  <li><a href="../examples/lock.lua.html">lock.lua</a></li>
  <li><a href="../examples/netlink-uevent.lua.html">netlink-uevent.lua</a></li>
  <li><a href="../examples/packet-socket.lua.html">packet-socket.lua</a></li>
  <li><strong>ping.lua</strong></li>
  <li><a href="../examples/poll.lua.html">poll.lua</a></li>
  <li><a href="../examples/rt_sched.lua.html">rt_sched.lua</a></li>
  <li><a href="../examples/signal.lua.html">signal.lua</a></li>
  <li><a href="../examples/socket.lua.html">socket.lua</a></li>
  <li><a href="../examples/termios.lua.html">termios.lua</a></li>
  <li><a href="../examples/tree.lua.html">tree.lua</a></li>
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<h2>Modules</h2>
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  <li><a href="../modules/posix.stdlib.html">posix.stdlib</a></li>
  <li><a href="../modules/posix.sys.msg.html">posix.sys.msg</a></li>
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<div id="content">

    <h2>ping.lua</h2>
<pre>
#! /usr/bin/env lua

<span class="keyword">local</span> M = <span class="global">require</span> <span class="string">'posix.sys.socket'</span>


<span class="keyword">if</span> M.SOCK_RAW <span class="keyword">and</span> M.SO_BINDTODEVICE <span class="keyword">then</span>
   <span class="comment">-- Open raw socket
</span>
   <span class="keyword">local</span> fd, err = M.<span class="function-name">socket</span>(M.AF_INET, M.SOCK_RAW, M.IPPROTO_ICMP)
   <span class="global">assert</span>(fd, err)

   <span class="comment">-- Optionally, bind to specific device
</span>
   <span class="keyword">local</span> ok, err = M.<span class="function-name">setsockopt</span>(fd, M.SOL_SOCKET, M.SO_BINDTODEVICE, <span class="string">'wlan0'</span>)
   <span class="global">assert</span>(ok, err)

   <span class="comment">-- Create raw ICMP echo (ping) message
</span>
   <span class="keyword">local</span> data = <span class="global">string</span>.<span class="function-name">char</span>(<span class="number">0x08</span>, <span class="number">0x00</span>, <span class="number">0x89</span>, <span class="number">0x98</span>, <span class="number">0x6e</span>, <span class="number">0x63</span>, <span class="number">0x00</span>, <span class="number">0x04</span>, <span class="number">0x00</span>)

   <span class="comment">-- Send message
</span>
   <span class="keyword">local</span> ok, err = M.<span class="function-name">sendto</span>(fd, data, {family=M.AF_INET, addr=<span class="string">'8.8.8.8'</span>, port=<span class="number">0</span>})
   <span class="global">assert</span>(ok, err)

   <span class="comment">-- Read reply
</span>
   <span class="keyword">local</span> data, sa = M.<span class="function-name">recvfrom</span>(fd, <span class="number">1024</span>)
   <span class="global">assert</span>(data, sa)

   <span class="keyword">if</span> data <span class="keyword">then</span>
      <span class="global">print</span>(<span class="string">'Received ICMP message from '</span> .. sa.addr)
   <span class="keyword">end</span>
<span class="keyword">end</span></pre>


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