func main() {
// `snmpgo.SNMP.Open` function execute the EngineID Discovery when you use V3.
// Specify the Agent's EngineID to `snmpgo.SNMPArguments.SecurityEngineId` parameter,
// if you want to suppress this behavior.
snmp, err := snmpgo.NewSNMP(snmpgo.SNMPArguments{
Version: snmpgo.V3,
Address: "127.0.0.1:162",
Retries: 1,
UserName: "******",
SecurityLevel: snmpgo.AuthPriv,
AuthPassword: "******",
AuthProtocol: snmpgo.Sha,
PrivPassword: "******",
PrivProtocol: snmpgo.Aes,
SecurityEngineId: "8000000004736e6d70676f",
})
if err != nil {
// Failed to create snmpgo.SNMP object
fmt.Println(err)
return
}
// Build VarBind list
var varBinds snmpgo.VarBinds
varBinds = append(varBinds, snmpgo.NewVarBind(snmpgo.OidSysUpTime, snmpgo.NewTimeTicks(1000)))
oid, _ := snmpgo.NewOid("1.3.6.1.6.3.1.1.5.3")
varBinds = append(varBinds, snmpgo.NewVarBind(snmpgo.OidSnmpTrap, oid))
oid, _ = snmpgo.NewOid("1.3.6.1.2.1.2.2.1.1.2")
varBinds = append(varBinds, snmpgo.NewVarBind(oid, snmpgo.NewInteger(2)))
oid, _ = snmpgo.NewOid("1.3.6.1.2.1.31.1.1.1.1.2")
varBinds = append(varBinds, snmpgo.NewVarBind(oid, snmpgo.NewOctetString([]byte("eth0"))))
if err = snmp.Open(); err != nil {
// Failed to open connection
fmt.Println(err)
return
}
defer snmp.Close()
if err = snmp.V2Trap(varBinds); err != nil {
// Failed to request
fmt.Println(err)
return
}
}
func TestInteger(t *testing.T) {
expInt := int64(2147483647)
expStr := "2147483647"
expBuf := []byte{0x02, 0x04, 0x7f, 0xff, 0xff, 0xff}
var v snmpgo.Variable = snmpgo.NewInteger(int32(expInt))
big, err := v.BigInt()
if err != nil {
t.Errorf("Failed to call BigInt(): %v", err)
}
if expInt != big.Int64() {
t.Errorf("BigInt() - expected [%d], actual [%d]", expInt, big.Int64())
}
if expStr != v.String() {
t.Errorf("String() - expected [%s], actual [%s]", expStr, v.String())
}
buf, err := v.Marshal()
if err != nil {
t.Errorf("Marshal(): %v", err)
}
if !bytes.Equal(expBuf, buf) {
t.Errorf("Marshal() - expected [%s], actual [%s]",
snmpgo.ToHexStr(expBuf, " "), snmpgo.ToHexStr(buf, " "))
}
var w snmpgo.Integer
rest, err := (&w).Unmarshal(buf)
if len(rest) != 0 || err != nil {
t.Errorf("Unmarshal() - len[%d] err[%v]", len(rest), err)
}
if expStr != w.String() {
t.Errorf("Unmarshal() - expected [%s], actual [%s]", expStr, w.String())
}
buf = append(buf, 0x00)
rest, err = (&w).Unmarshal(buf)
if len(rest) != 1 || err != nil {
t.Errorf("Unmarshal() with rest - len[%d] err[%v]", len(rest), err)
}
if expStr != w.String() {
t.Errorf("Unmarshal() with rest - expected [%s], actual [%s]", expStr, w.String())
}
}
func TestVarBind(t *testing.T) {
var v snmpgo.VarBind
oid, _ := snmpgo.NewOid("1.3.6.1.2.1.1.1.0")
v = snmpgo.VarBind{Oid: oid}
v.Variable = snmpgo.NewInteger(-2147483648)
testVarBind(t, &v,
`{"Oid": "1.3.6.1.2.1.1.1.0", "Variable": {"Type": "Integer", "Value": "-2147483648"}}`)
v.Variable = snmpgo.NewOctetString([]byte("MyHost"))
testVarBind(t, &v,
`{"Oid": "1.3.6.1.2.1.1.1.0", "Variable": {"Type": "OctetString", "Value": "MyHost"}}`)
v.Variable = snmpgo.NewNull()
testVarBind(t, &v, `{"Oid": "1.3.6.1.2.1.1.1.0", "Variable": {"Type": "Null", "Value": ""}}`)
v.Variable = snmpgo.NewCounter32(uint32(4294967295))
testVarBind(t, &v,
`{"Oid": "1.3.6.1.2.1.1.1.0", "Variable": {"Type": "Counter32", "Value": "4294967295"}}`)
v.Variable = snmpgo.NewCounter64(uint64(18446744073709551615))
testVarBind(t, &v, `{"Oid": "1.3.6.1.2.1.1.1.0", `+
`"Variable": {"Type": "Counter64", "Value": "18446744073709551615"}}`)
expBuf := []byte{0x30, 0x00}
v = snmpgo.VarBind{}
buf, err := v.Marshal()
if err != nil {
t.Errorf("Marshal() : %v", err)
}
if !bytes.Equal(expBuf, buf) {
t.Errorf("Marshal() - expected [%s], actual [%s]",
snmpgo.ToHexStr(expBuf, " "), snmpgo.ToHexStr(buf, " "))
}
buf = []byte{0x00, 0x00}
_, err = (&v).Unmarshal(buf)
if err == nil {
t.Errorf("Unmarshal() : can not validation")
}
}
func main() {
snmp, err := snmpgo.NewSNMP(snmpgo.Arguments{
Version: snmpgo.V2c,
Address: "127.0.0.1:162",
Retries: 1,
Community: "public",
})
if err != nil {
// Failed to create snmpgo.SNMP object
fmt.Println(err)
return
}
// Build VariableBinding list
var VariableBindings snmpgo.VariableBindings
VariableBindings = append(VariableBindings, snmpgo.NewVarBind(snmpgo.OidSysUpTime, snmpgo.NewTimeTicks(1000)))
oid, _ := snmpgo.ParseOidFromString("1.3.6.1.6.3.1.1.5.3")
VariableBindings = append(VariableBindings, snmpgo.NewVarBind(snmpgo.OidSnmpTrap, oid))
oid, _ = snmpgo.ParseOidFromString("1.3.6.1.2.1.2.2.1.1.2")
VariableBindings = append(VariableBindings, snmpgo.NewVarBind(oid, snmpgo.NewInteger(2)))
oid, _ = snmpgo.ParseOidFromString("1.3.6.1.2.1.31.1.1.1.1.2")
VariableBindings = append(VariableBindings, snmpgo.NewVarBind(oid, snmpgo.NewOctetString([]byte("eth0"))))
if err = snmp.Open(); err != nil {
// Failed to open connection
fmt.Println(err)
return
}
defer snmp.Close()
if err = snmp.V2Trap(VariableBindings); err != nil {
// Failed to request
fmt.Println(err)
return
}
}
func buildVariable(kind string, value string) (val snmpgo.Variable, err error) {
switch kind {
case "i":
var num int64
if num, err = strconv.ParseInt(value, 10, 32); err == nil {
val = snmpgo.NewInteger(int32(num))
}
case "u":
var num uint64
if num, err = strconv.ParseUint(value, 10, 32); err == nil {
val = snmpgo.NewGauge32(uint32(num))
}
case "c":
var num uint64
if num, err = strconv.ParseUint(value, 10, 32); err == nil {
val = snmpgo.NewCounter32(uint32(num))
}
case "C":
var num uint64
if num, err = strconv.ParseUint(value, 10, 64); err == nil {
val = snmpgo.NewCounter64(num)
}
case "t":
var num uint64
if num, err = strconv.ParseUint(value, 10, 32); err == nil {
val = snmpgo.NewTimeTicks(uint32(num))
}
case "a":
if ip := net.ParseIP(value); ip != nil && len(ip) == 4 {
val = snmpgo.NewIpaddress(ip[0], ip[1], ip[2], ip[3])
} else {
return nil, fmt.Errorf("%s: no valid IP Address", value)
}
case "o":
val, err = snmpgo.ParseOidFromString(value)
case "n":
val = snmpgo.NewNull()
case "s":
val = snmpgo.NewOctetString([]byte(value))
case "x":
var b []byte
hx := hexPrefix.ReplaceAllString(value, "")
if b, err = hex.DecodeString(hx); err == nil {
val = snmpgo.NewOctetString(b)
} else {
return nil, fmt.Errorf("%s: no valid Hex String", value)
}
case "d":
s := strings.Split(value, ".")
b := make([]byte, len(s))
for i, piece := range s {
var num int
if num, err = strconv.Atoi(piece); err != nil || num > 0xff {
return nil, fmt.Errorf("%s: no valid Decimal String", value)
}
b[i] = byte(num)
}
val = snmpgo.NewOctetString(b)
default:
return nil, fmt.Errorf("%s: unknown TYPE", kind)
}
return
}
