public static String getPhysAddrFromValue(SnmpValue value) {
String hexString = value.toHexString();
if (hexString.length() != 12) {
return null;
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 12; i += 2) {
sb.append(hexString.substring(i, i + 2));
if (i < 10) {
sb.append(':');
}
}
return sb.toString().toUpperCase();
}
private String getPhysAddr() {
final SnmpValue value = getValue(IF_PHYS_ADDR);
String hexString = value == null ? null : value.toHexString();
String displayString = value == null ? null : value.toDisplayString();
// See ifTableEntry: NMS-4902 (revision cee964fe979e6465aeb4e2efd4772e50ebc54831)
try {
if (hexString != null && hexString.length() == 12) {
// If the hex string is 12 characters long, than the agent is kinda weird and
// is returning the value as a raw binary value that is 6 bytes in length.
// But that's OK, as long as we can convert it into a string, that's fine.
return hexString;
} else {
// This is the normal case that most agents conform to: the value is an ASCII
// string representing the colon-separated MAC address. We just need to reformat
// it to remove the colons and convert it into a 12-character string.
return displayString == null || displayString.trim().isEmpty()
? null
: InetAddressUtils.normalizeMacAddress(displayString);
}
} catch (IllegalArgumentException e) {
LOG.warn(e.getMessage(), e);
return displayString;
}
}
private String getPhysAddr() {
final SnmpValue value = getValue(IF_PHYS_ADDR);
return value == null ? null : value.toHexString();
}
public OnmsAccessPointCollection call() throws IOException {
OnmsAccessPointCollection apsUp = new OnmsAccessPointCollection();
InetAddress ipaddr = m_iface.getIpAddress();
// Retrieve this interface's SNMP peer object
SnmpAgentConfig agentConfig = SnmpPeerFactory.getInstance().getAgentConfig(ipaddr);
if (agentConfig == null) {
throw new IllegalStateException(
"SnmpAgentConfig object not available for interface " + ipaddr);
}
final String hostAddress = InetAddressUtils.str(ipaddr);
log().debug("poll: setting SNMP peer attribute for interface " + hostAddress);
// Get configuration parameters
String oid = ParameterMap.getKeyedString(m_parameters, "oid", null);
if (oid == null) {
throw new IllegalStateException("oid parameter is not set.");
}
agentConfig.hashCode();
// Set timeout and retries on SNMP peer object
agentConfig.setTimeout(
ParameterMap.getKeyedInteger(m_parameters, "timeout", agentConfig.getTimeout()));
agentConfig.setRetries(
ParameterMap.getKeyedInteger(
m_parameters,
"retry",
ParameterMap.getKeyedInteger(m_parameters, "retries", agentConfig.getRetries())));
agentConfig.setPort(ParameterMap.getKeyedInteger(m_parameters, "port", agentConfig.getPort()));
if (log().isDebugEnabled()) {
log().debug("TableStrategy.poll: SnmpAgentConfig address= " + agentConfig);
}
// Establish SNMP session with interface
try {
SnmpObjId snmpObjectId = SnmpObjId.get(oid);
Map<SnmpInstId, SnmpValue> map =
SnmpUtils.getOidValues(agentConfig, "AccessPointMonitor::TableStrategy", snmpObjectId);
if (map.size() <= 0) {
throw new IOException("No entries found in table (possible timeout).");
}
for (Map.Entry<SnmpInstId, SnmpValue> entry : map.entrySet()) {
SnmpValue value = entry.getValue();
String physAddr = getPhysAddrFromValue(value);
log()
.debug(
"AP at value '"
+ value.toHexString()
+ "' with MAC '"
+ physAddr
+ "' is considered to be ONLINE on controller '"
+ m_iface.getIpAddress()
+ "'");
OnmsAccessPoint ap = m_accessPointDao.findByPhysAddr(physAddr);
if (ap != null) {
if (ap.getPollingPackage().compareToIgnoreCase(getPackage().getName()) == 0) {
// Save the controller's IP address
ap.setControllerIpAddress(ipaddr);
apsUp.add(ap);
} else {
log().info("AP with MAC '" + physAddr + "' is in a different package.");
}
} else {
log().info("No matching AP in database for value '" + value.toHexString() + "'.");
}
}
} catch (InterruptedException e) {
log().error("Interrupted while polling " + hostAddress, e);
}
return apsUp;
}
