eSNMP API Routines inst2ip

The search key consists of a number and two ipaddr values. These are represented in the instance part of the OID as n.A.A.A.A.B.B.B.B, where:

•n is a single value integer.

•The A.A.A.A portion makes up one IP address.

•The B.B.B.B portion makes up a second IP address.

If all elements are given, the total length of the search key is 9. In this case, you perform the operation as follows:

•Convert the least significant part of the key (that is, the B.B.B.B portion), by calling the inst2ip routine, passing it a 1 for the carry and (length - 5) for the length.

•If the conversion of the B.B.B.B portion generates a carry (that is, returns 1), you pass it to the next most significant part of the key.

•Convert the A.A.A.A portion by calling the inst2ip routine, passing it (length - 1) for the length and the carry returned from the conversion of the B.B.B.B portion.

•The most significant element n is a number; therefore, add the carry from the A.A.A.A conversion to the number. If the result overflows, then the search key is not valid.

#include <esnmp.h>

OID

*incoming = &method->varbind->name;

OBJECT

*object = method->object;

int instLength;

unsigned int instance[9];

unsigned int ip_addrA;

unsigned int ip_addrB;

int

iface;

int

carry;

-- The instance is N.A.A.A.A.B.B.B.B --

instLength = oid2instance(incoming, object, instance, 9); iface = (instLength < 1) ? 0 :(int) instance[0];

carry = inst2ip(&instance[1], instLength - 1, &ip_addrB, FALSE, 1); carry = inst2ip(&instance[5], instLength - 5, &ip_addrA, FALSE, carry); iface += carry;

if (iface > carry) {

--a carry caused an overflow in the most significant element return ESNMP_MTHD_noSuchInstance;

}

5–46eSNMP API Routines

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Compaq AAR04BCTE manual Unsigned int instance9
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