SNMP_structFiller(3) C++ object to contain data for SNMP queries


#include <snmpkit>

SNMP_structFiller::SNMP_structFiller(SNMP_session &sess);


void SNMP_structFiller::append_int(const string &oidstr,void (*fp)(void*,long));

void SNMP_structFiller::append_counter(const string &oidstr, void (*fp)(void*,long));

void SNMP_structFiller::append_timetick(const string &oidstr, void (*fp)(void*,unsigned long));

void SNMP_structFiller::append_ipaddr(const string &oidstr, void (*fp)(void*,const unsigned char *));

void SNMP_structFiller::append_string(const string &oidstr, void (*fp)(void*,const char *));

void SNMP_structFiller::remove(const string &oidstr);

void *SNMP_structFiller::get(void *tobefilled);

void *SNMP_structFiller::get_next(void *tobefilled);


A SNMP_structFiller object takes a list of SNMP objects and queries the SNMP_session(3) and fills in the structure based upon that information.

The SNMP protocol is designed in a way where there is significant overhead in process of encoding and exchanging a packet. Therefore it is very inefficient and time consuming to exchange many variables in individual request packets. The way around this is to bulk up a bunch of SNMP requests into one packet. Since it is most likely that you will be frequently fetching information which is related, the SNMP_structFiller is designed to associate the SNMP objects and data types with the offsets into the structure. That way when you do a get or a get_next you will get back a completely filled in structure.


You will need to create a new SNMP_structFiller instance for each different set of SNMP objects you wish to fetch. The SNMP data structure is initially empty. You can add request information via the SNMP_structFiller::append() method.


Destructor for an SNMP_structFiller object

void SNMP_structFiller::append_int(const string &oidstr,void (*fp)(void*,long));

void SNMP_structFiller::append_counter (const string &oidstr, void (*fp)(void*,long));

void SNMP_structFiller::append_timetick (const string &oidstr, void (*fp)(void*,unsigned long));

void SNMP_structFiller::append_ipaddr (const string &oidstr, void (*fp)(void*,const unsigned char *));

void SNMP_structFilleri::append_string(const string &oidstr, void (*fp)(void*,const char *));

All of the various append methods add an SNMP object to the end of the SNMP_structFiller instance. Each method requires the OID of the SNMP object to add and a function that will insert it into the associated structure.

This library does not attempt to read MIBs. This means that youwill need to look up the OID string before hand and hard code the OIDstring into your program.

The job of the function pointer is to insert whatever data it gets back into the the data structure. This allows you to do any kind of munging around you want with the data you get and therefore you can have much more complicated receiving structure. See the example programs included with the SNMPkit documentation (snmptest*.C) for examples of various uses of this.


* BerOidBadSubOidException - One of the OIDs could not be converted to a number.

* BerNoOidsException - No OIDs were specified.

void SNMP_structFiller::remove(const string &oidstr);

Delete an SNMP object from the SNMP_structFiller instance.


* FillerRemoveEmptyException - An attempt was made to remove from an empty SNMP_structFiller object; results from a programming error.

* FillerRemoveNotFoundException - An attempt was made to remove an item not currently in the container; results from a programming error.

* FillerCorruptException - The SNMP table entry was successfully removed, however the OID sequence was NULL; results from a programming error in the library.

* OidSeqRemoveNotFoundException - A programming error resulted in the attempt to remove something that was not there.

* OidSeqBadLayoutException - The BER sequence did not follow the layout of an OID sequence.

void *SNMP_structFiller::get(void *tobefilled);

Send the SNMP get request to the SNMP Agent and fill the structure tobefilled with the data returned using the previously defined inserter functions.


* SNMPNoResponseException - The SNMP_structFiller object did not receive a response from the remote SNMP Agent. This can be caused by many things, no agent running on destination, a firewall between you and the destination.

* SNMPPacketNotSequenceException - The response received was not a valid SNMP response.

* SNMPRespNotSequenceException - The packet received was a valid SNMP response but the payload of the packet wasn't a sequence type.

* SNMPNotResponseTagException - The type of the SNMP response received was invalid (not 0xa2).

* SNMPSeqnoNotIntException - The sequence number of the response was not a classified as a number.

* SNMPStateNotIntException - The SNMP device sent back an improperly constructed response packet and the status was not classified as an integer.

* SNMPFaultOidNotIntException - A response was returned with an error but the index to the problem OID was not classified as an integer.

* OidSeqBadLayoutException - Within a SNMP packet there is a substructure which is an OID sequence. If the packet was supposed to have an OID sequence in a particular locaion but for some reason one of the elements was not of the correct type, then this exception will be thrown.

* SNMPBadOidException - An OID in the SNMP response packet was invalid

* SocketSendShortExecption - An error occurred while sending the SNMP request resulting in an incomplete transmission of the query

* BerSequenceTagException, BerIntTagException, BerCounterTagException, BerStringTagException, BerNullTagException, BerOidTagException, BerTimeTickTagException - Although this will result from a encoding error, it is caused by calling a BER object constructor on an invalid piece of data.

* BerLengthException, BerIntLengthExecption, BerCounterLengthExecption, BerNullLengthExecption, BerTimeTickLengthExecption, BerIPAddrLengthExecption - The size of the data to be encoded (BER) will not fit into an unsigned long data type.

void *SNMP_structFiller::get_next(void *tobefilled);

Query the object which is next in the list of available objects from the SNMP Agent.


Same as the SNMP_structFiller::get() method


The SNMPkit C/C++ library was originally developed by Ben Woodard <[email protected]>. This man page was written by Gerald Carter <[email protected]>