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2012-06-25agentx: handle SNMP trapsVincent Bernat
smux_trap() signature has been changed to provide appropriate level information to send SNMPv2 notifications. This includes the addition of the enterprise OID to use (from which is derived the SNMP trap OID) and the MIB registry to locate the appropriate function for variable bindings provided by the trap. The SMUX implementation has been updated but ignore the provided enterprise OID. Instead, it still uses the SMUX peer OID to keep compatibility with previous versions of Quagga. The SMUX implementation also ignores the provided MIB registry since it uses smux_get() function to grab the appropriate values. This is not possible with the AgentX implementation since there is no such function provided by NetSNMP.
2012-06-25smux: remove `tick` argument from smux_trap()Vincent Bernat
smux_trap() contains an argument whose use appears to be to set sysUpTime.0/timestamp field in SNMP trap. However, this value is not used in smux_trap(). Moreover, it is expected that this field is the value of sysUpTime.0 when the trap was sent and not any other time related to the trap. To avoid any confusion, we remove this field from the signature of the function.
2012-06-25agentx: add AgentX support to Quagga.Vincent Bernat
--enable-snmp will enable AgentX support in Quagga. SMUX is still here and can be enabled with --enable-snmp=smux. AgentX support can be enabled with "agentx" in configuration file. As for SMUX, this command is not understood by vtysh. It can be disabled with "no agentx", though there is no real use of this since this command cannot be used with vtysh. If "agentx" and "no agentx" command were added to vtysh, it would not be possible to disable agentx support after enabling it because NetSNMP does not expose the appropriate methods for this. The internals of AgentX are hidden by NetSNMP. Therefore, we don't have a file descriptor to add to the threading system. We do not have the timers to set either. Therefore, the event loop is modified to make use of snmp_select_info() from NetSNMP. Traps are not supported yet.