func getIfInfo(snmp *snmpgo.SNMP) (*ifInfo, error) {
pdu, err := snmp.GetBulkWalk(snmpgo.Oids{sysDescr, ifAdminStatus, ifName}, 1, maxRepetitions)
if err != nil {
return nil, err
}
if pdu.ErrorStatus() != snmpgo.NoError {
return nil, fmt.Errorf(
"failed to get system information - %s(%d)", pdu.ErrorStatus(), pdu.ErrorIndex())
}
info := newIfInfo()
if descrs := pdu.VarBinds().MatchBaseOids(sysDescr); len(descrs) > 0 {
info.descr = descrs[0].Variable.String()
}
ifNameDepth := len(ifName.Value)
for _, varBind := range pdu.VarBinds().MatchBaseOids(ifName) {
// get interface number and name
if len(varBind.Oid.Value) != ifNameDepth+1 {
continue
}
ifNum := varBind.Oid.Value[ifNameDepth]
ifName := varBind.Variable.String()
if ifRegexp != nil && !ifRegexp.MatchString(ifName) {
continue
}
// get admin status
oid, err := ifAdminStatus.AppendSubIds([]int{ifNum})
if err != nil {
return nil, err
}
// check admin status("1" is up)
if adms := pdu.VarBinds().MatchOid(oid); adms == nil || adms.Variable.String() != "1" {
continue
}
info.IfList = append(info.IfList, ifNum)
info.IfName[ifNum] = ifName
info.IfIn[ifNum] = nil
info.IfOut[ifNum] = nil
info.LastIfIn[ifNum] = nil
info.LastIfOut[ifNum] = nil
}
if len(info.IfList) == 0 {
return nil, fmt.Errorf("no interface")
}
return info, nil
}
func getIfTraffic(snmp *snmpgo.SNMP, info *ifInfo) error {
pdu, err := snmp.GetBulkWalk(snmpgo.Oids{ifHCInOctets, ifHCOutOctets}, 0, maxRepetitions)
if err != nil {
return err
}
if pdu.ErrorStatus() != snmpgo.NoError {
return fmt.Errorf(
"failed to get network traffic - %s(%d)", pdu.ErrorStatus(), pdu.ErrorIndex())
}
for _, ifNum := range info.IfList {
oid, err := ifHCInOctets.AppendSubIds([]int{ifNum})
if err != nil {
return err
}
if in := pdu.VarBinds().MatchOid(oid); in != nil {
count, err := in.Variable.BigInt()
if err != nil {
return err
}
info.LastIfIn[ifNum], info.IfIn[ifNum] = info.IfIn[ifNum], count
} else {
info.LastIfIn[ifNum], info.IfIn[ifNum] = info.IfIn[ifNum], nil
}
oid, err = ifHCOutOctets.AppendSubIds([]int{ifNum})
if err != nil {
return err
}
if out := pdu.VarBinds().MatchOid(oid); out != nil {
count, err := out.Variable.BigInt()
if err != nil {
return err
}
info.LastIfOut[ifNum], info.IfOut[ifNum] = info.IfOut[ifNum], count
} else {
info.LastIfOut[ifNum], info.IfOut[ifNum] = info.IfOut[ifNum], nil
}
}
info.LastTime, info.Time = info.Time, time.Now()
return nil
}