fix translating snmp fields not in MIB (#1846)

CHANGELOG.md

@@ -43,6 +43,7 @@
 - [#1772](https://github.com/influxdata/telegraf/pull/1772): Windows remote management interactive service fix.
 - [#1702](https://github.com/influxdata/telegraf/issues/1702): sqlserver, fix issue when case sensitive collation is activated.
 - [#1823](https://github.com/influxdata/telegraf/issues/1823): Fix huge allocations in http_listener when dealing with huge payloads.
+- [#1833](https://github.com/influxdata/telegraf/issues/1833): Fix translating SNMP fields not in MIB.
 
 ## v1.0.1 [unreleased]
 

plugins/inputs/snmp/snmp.go

@@ -850,11 +850,16 @@ func snmpTranslate(oid string) (mibName string, oidNum string, oidText string, c
 
 	i := strings.Index(oidText, "::")
 	if i == -1 {
-		// was not found in MIB. Value is numeric
+		// was not found in MIB.
-		return "", oidText, oidText, "", nil
+		if bytes.Index(bb.Bytes(), []byte(" [TRUNCATED]")) >= 0 {
+			return "", oid, oid, "", nil
+		}
+		// not truncated, but not fully found. We still need to parse out numeric OID, so keep going
+		oidText = oid
+	} else {
+		mibName = oidText[:i]
+		oidText = oidText[i+2:]
 	}
-	mibName = oidText[:i]
-	oidText = oidText[i+2:]
 
 	if i := bytes.Index(bb.Bytes(), []byte("  -- TEXTUAL CONVENTION ")); i != -1 {
 		bb.Next(i + len("  -- TEXTUAL CONVENTION "))

plugins/inputs/snmp/snmp_mocks_generate.go

@@ -21,6 +21,8 @@ var mockedCommands = [][]string{
 	{"snmptranslate", "-Td", "-Ob", "-m", "all", "1.0.0.1.1"},
 	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".1.0.0.0.1.1"},
 	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".1.0.0.0.1.1.0"},
+	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".1.2.3"},
+	{"snmptranslate", "-Td", "-Ob", ".iso.2.3"},
 	{"snmptranslate", "-Td", "-Ob", "-m", "all", ".999"},
 	{"snmptranslate", "-Td", "-Ob", "TEST::server"},
 	{"snmptranslate", "-Td", "-Ob", "TEST::server.0"},

plugins/inputs/snmp/snmp_mocks_test.go

@@ -67,6 +67,8 @@ var mockedCommandResults = map[string]mockedCommandResult{
 	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x001.0.0.1.1":                   mockedCommandResult{stdout: "TEST::hostname\nhostname OBJECT-TYPE\n  -- FROM\tTEST\n  SYNTAX\tOCTET STRING\n  MAX-ACCESS\tread-only\n  STATUS\tcurrent\n::= { iso(1) 0 testOID(0) 1 1 }\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.1.0.0.0.1.1":                mockedCommandResult{stdout: "TEST::server\nserver OBJECT-TYPE\n  -- FROM\tTEST\n  SYNTAX\tOCTET STRING\n  MAX-ACCESS\tread-only\n  STATUS\tcurrent\n::= { iso(1) 0 testOID(0) testTable(0) testTableEntry(1) 1 }\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.1.0.0.0.1.1.0":              mockedCommandResult{stdout: "TEST::server.0\nserver OBJECT-TYPE\n  -- FROM\tTEST\n  SYNTAX\tOCTET STRING\n  MAX-ACCESS\tread-only\n  STATUS\tcurrent\n::= { iso(1) 0 testOID(0) testTable(0) testTableEntry(1) server(1) 0 }\n", stderr: "", exitError: false},
+	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.1.2.3":                      mockedCommandResult{stdout: "iso.2.3\niso OBJECT-TYPE\n  -- FROM\t#-1\n::= { iso(1) 2 3 }\n", stderr: "", exitError: false},
+	"snmptranslate\x00-Td\x00-Ob\x00.iso.2.3":                                 mockedCommandResult{stdout: "iso.2.3\niso OBJECT-TYPE\n  -- FROM\t#-1\n::= { iso(1) 2 3 }\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00-m\x00all\x00.999":                        mockedCommandResult{stdout: ".999\n [TRUNCATED]\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00TEST::server":                             mockedCommandResult{stdout: "TEST::server\nserver OBJECT-TYPE\n  -- FROM\tTEST\n  SYNTAX\tOCTET STRING\n  MAX-ACCESS\tread-only\n  STATUS\tcurrent\n::= { iso(1) 0 testOID(0) testTable(0) testTableEntry(1) 1 }\n", stderr: "", exitError: false},
 	"snmptranslate\x00-Td\x00-Ob\x00TEST::server.0":                           mockedCommandResult{stdout: "TEST::server.0\nserver OBJECT-TYPE\n  -- FROM\tTEST\n  SYNTAX\tOCTET STRING\n  MAX-ACCESS\tread-only\n  STATUS\tcurrent\n::= { iso(1) 0 testOID(0) testTable(0) testTableEntry(1) server(1) 0 }\n", stderr: "", exitError: false},

plugins/inputs/snmp/snmp_test.go

@@ -128,6 +128,8 @@ func TestFieldInit(t *testing.T) {
 		expectedName       string
 		expectedConversion string
 	}{
+		{".1.2.3", "foo", "", ".1.2.3", "foo", ""},
+		{".iso.2.3", "foo", "", ".1.2.3", "foo", ""},
 		{".1.0.0.0.1.1", "", "", ".1.0.0.0.1.1", "server", ""},
 		{".1.0.0.0.1.1.0", "", "", ".1.0.0.0.1.1.0", "server.0", ""},
 		{".999", "", "", ".999", ".999", ""},