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I started using this function in an effort to grab dynamic data from the router and switches I help manage.
The functions that I use the most are;
To use these function you must compile php by running configure;
./configure --with-snmp --enable-ucd-snmp-hack
snmpget();
snmpwalk();
snmpwalkoid();
snmpset();
Using some of the above functions
<?
function queryRouter($hostname) {
/* This snmpwalk functions allows me to create an array of the interface
on the device */
$_mibvars =
snmpwalk("$hostname","$community","interfaces.ifTable.ifEntry.ifIndex");
/* Do this until we run out of interfaces */
for($i=0; count($_mibvars); $i++)
{
/* Using snmpget */
$sysdescr = snmpget("$hostname","$community","system.sysDescr.0");
$syscontact =
snmpget("$hostname","$community","system.sysContact.0");
$sysuptime =
snmpget("$hostname","$community","system.sysUptime.0");
$syslocation =
snmpget("$hostname","$community","system.sysLocation.0");
$interface[] =
snmpget("$hostname","$community","interfaces.ifTable.ifEntry.ifDescr.$_mibvars[$i]");
$interface_type[] =
snmpget("$hostname","$community","interfaces.ifTable.ifEntry.ifType.$_mibvars[$i]");
}
print"
<table width=600 cellspacing=2>
<tr>
<td>$sysdescr</td><td>$syscontact</td>
<td>$sysuptime</td><td>$syslocation</td>
<td>$sysdescr</td><td>$syscontact</td>
<td>$sysuptime</td><td>$syslocation</td>
</tr>
</table>
";
print "
<table width=600 cellspacing=2>
<tr>
<td>";
for($i=0; $i<count(interface); $i++) {
echo $interface[$i];
}
print "
</td><td>";
for($i=0; $i<count(interface); $i++) {
echo $interface_type[$i];
}
print "
</td>
</tr>
</table>
";
}
$hostname = "";
queryRouter($hostname);
?>
There are times when you may want to modify values remotely
Create a form with a contact and location input name and post them to the the example code below..
<?
$updated_contact = snmpset("$hostname","$community","system.sysContact.0",
s , "$contact");
$updated_location =
snmpset("$hostname","$community","system.sysLocation.0", s , "$location");
echo "Contact Changed to: $updated_contact <BR>\n";
echo "Location Changed to: $updated_location <BR>\n";
?>
Here I will create a function and pass it a ip address
Then create a variable and assign it a value, and using echo to display the data.
Using the snmpwalkoid() function
function snmpwalkhost($ipaddr) {
$a = snmpwalkoid("$ipaddr", "public", "");
for (reset($a); $i = key($a); next($a)) {
echo "$i: $a[$i]<br>\n";
}
}
print "<p>";
snmpwalkhost($ipaddr);
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