SNMP Manager Programmer's Guide

Encoding and Decoding Packets

SNMP Manager Programmer’s Guide–134249

6-17

Function for Decoding Packets

When you receive a response or trap packet, regardless of whether the packet is BER- or

IPC-encoded, you use SNMP_Decode_Packet_WER() to decode it into a structure of

type SNMP_PKT_T, which this function allocates dynamically. Dynamically allocated

memory should be released by using SNMP_Free() when you no longer need the

decoded-packet structure.

packet

is a pointer to a structure of type SNMP_PKT_T if the function succeeds or a null

pointer if it fails.

rcvd-buffer

is a pointer to the descriptor structure for the buffer containing the packet to be

decoded.

read-count

is the number of bytes to decode.

rcode

is a pointer to an integer describing the success of the call. A value of 0 indicates

success, and a value of 1 indicates an error occurred.

pktsrc

pktdst

are pointers to the source and destination addresses of the packet. These values are

ignored; the sample managers all set the addresses to 0.

packet = SNMP_Decode_Packet_WER(rcvd-buffer, read-count,

(SNMPADDR_T*) 0,

rcode);

SNMP_PKT_T* SNMP_Decode_Packet_WER(unsigned char *rcvd-

buffer,

int read-count,

SNMPADDR_T *pktsrc,

SNMPADDR_T *pktdst,

int *rcode);