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124 LuaSNMP - Examples</big></big> <br />
138 Simple
139 Network Management Access with Lua</h1>
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558 <p>Most of the examples in the reference section of this manual, are
559 provided in the doc/examples subdirectory. LuaSNMP comes with a test
560 script test.lua, which also contains a large number of programming
561 examples. Note, however, that this script is not officially supported
562 and may change frequently.</p>
574 <pre>#! /usr/local/bin/lua50<br />--<br />-- Function walk implements a MIB subtree traversal<br />-- It receives three parameters: <br />-- the identification of an SNMP agent (a host name or IP address)<br />-- the community string<br />-- a MIB label identifying the subtree to be traversed (optional)<br />--<br />local snmp = require "snmp"<br />local mib=snmp.mib<br /><br />function walk(host, commStr, subtree)<br /><br /> -- Open an SNMP session with host using SNMPv1<br /> local s,err = snmp.open{peer = host, version = SNMPv2, community=commStr}<br /> if not s then<br /> print(string.format("walk: unable to open session with %s\n%s\n",err))<br /> return<br /> end<br /> <br /> -- Convert MIB label to its OID. <br /> local root<br /> if subtree then<br /> root = mib.oid(subtree)<br /> if not root then<br /> print(string.format("walk: invalid subtree %s\n",subtree))<br /> return<br /> end<br /> else -- if no label is defined, traverse the entire MIB<br /> root = "1"<br /> end<br /> <br /> -- Traverse the subtree<br /> local vb={oid=root}<br /> local mibEnd<br /> repeat<br /> vb,err = s:getnext(vb)<br /> if not err then<br /> -- Check if the returned OID contains the OID associated <br /> -- with the root of the subtree<br /> if string.find(vb.oid,root) == nil or <br /> vb.type == snmp.ENDOFMIBVIEW then<br /> mibEnd = 1<br /> else<br /> -- print the returned varbind and request next var<br /> -- use LuaSNMP's sprintvar:<br /> -- print(snmp.sprintvar(vb))<br /> -- or NETSNMP's sprint_var via session<br /> -- print(session:sprintvar(vb))<br /> -- or simply rely on Lua's __tostring metamethod<br /> print(vb)<br /> end<br /> end<br /> until err or mibEnd<br /> <br /> -- Close the SNMP session<br /> s:close(s)<br /> <br />end<br /><br />walk(arg[1], arg[2], arg[3])</pre>
582 <pre>#! /usr/local/bin/lua50<br />--<br />-- This is an asynchronous version of the MIB traversal<br />--<br /><br />local snmp = require "snmp"<br />local mib = snmp.mib<br />--<br />-- Callback function for handling the response to get-next<br />--<br /><br />function walk_cb(vb, err, ind, reqid, session, root)<br /><br /> if not err then<br /> -- Check if the returned OID contains the OID associated<br /> -- with the root of the subtree<br /> if string.find(vb.oid, root) == nil or <br /> vb.type == snmp.ENDOFMIBVIEW then<br /> session:close()<br /> return<br /> else<br /> -- print the returned varbind and request next var<br /> -- use LuaSNMP's sprintvar:<br /> -- print(snmp.sprintvar(vb))<br /> -- or NETSNMP's sprint_var via session<br /> -- print(session:sprintvar(vb))<br /> -- or simply rely on Lua's __tostring metamethod<br /> print(vb)<br /> req, err, ind = session:asynch_getnext(vb, walk_cb, root)<br /> end<br /> else<br /> snmp.close(session)<br /> end<br />end<br /><br />-- Function walk receives three parameters:<br />-- the identification of an SNMP agent (a host name or IP address)<br />-- the community string<br />-- a MIB label identifying the subtree to be traversed (optional)<br /><br />function walk(host,commStr,subtree)<br /> -- Open an SNMP session with host using SNMPv1<br /> local s,err = snmp.open{peer = host, version = SNMPv1, community = commStr}<br /> if not s then<br /> print(string.format("walk: unable to open session with %s\n%s",<br /> host, err))<br /> return<br /> end<br /><br /> -- Convert MIB label to its OID<br /> local root<br /> if subtree then<br /> root = mib.oid(subtree)<br /> if root == nil then<br /> print(string.format("walk: invalid subtree %s", subtree))<br /> return<br /> end<br /> else -- if no label is defined, traverse the entire MIB<br /> root = "1"<br /> end<br /><br /> -- Start the traversal with the first asynchronous request<br /> -- (the callback function will issue the other requests)<br /> local vb={oid=root}<br /> req, err = snmp.asynch_getnext(s, vb, walk_cb, root)<br /> if err then<br /> s:close()<br /> return<br /> end<br /> s:wait()<br /> s:close()<br />end<br /><br />walk(arg[1], arg[2], arg[3])<br /></pre>
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607 <div id="footer">(c) 2006-2009 Herbert Leuwer, March 2006 <a href="mailto:herbert.leuwer@t-online.de">Contact</a></div>
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