feat(inputs.win_wmi): Add support for remote queries

plugins/inputs/win_wmi/README.md

@@ -19,12 +19,27 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
 
 [CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins
 
+## Secret-store support
+
+This plugin supports secrets from secret-stores for the `username` and
+`password` option.
+See the [secret-store documentation][SECRETSTORE] for more details on how
+to use them.
+
+[SECRETSTORE]: ../../../docs/CONFIGURATION.md#secret-store-secrets
+
 ## Configuration
 
 ```toml @sample.conf
 # Input plugin to query Windows Management Instrumentation
 # This plugin ONLY supports Windows
 [[inputs.win_wmi]]
+  ## Hostname or IP for remote connections, by default the local machine is queried
+  # host = ""
+  ## Credentials for the connection, by default no credentials are used
+  # username = ""
+  # password = ""
+
   [[inputs.win_wmi.query]]
     # a string representing the WMI namespace to be queried
     namespace = "root\\cimv2"

plugins/inputs/win_wmi/query.go

@@ -10,7 +10,9 @@ import (
 
 	"github.com/go-ole/go-ole"
 	"github.com/go-ole/go-ole/oleutil"
+
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/filter"
 	"github.com/influxdata/telegraf/internal"
 )
@@ -23,18 +25,44 @@ type Query struct {
 	Filter               string   `toml:"filter"`
 	TagPropertiesInclude []string `toml:"tag_properties"`
 
-	tagFilter filter.Filter
-	query     string
+	host             string
+	query            string
+	connectionParams []interface{}
+	tagFilter        filter.Filter
 }
 
-func (q *Query) prepare() error {
+func (q *Query) prepare(host string, username, password config.Secret) error {
 	// Compile the filter
 	f, err := filter.Compile(q.TagPropertiesInclude)
 	if err != nil {
 		return fmt.Errorf("compiling tag-filter failed: %w", err)
 	}
 	q.tagFilter = f
 
+	q.host = host
+	if q.host != "" {
+		q.connectionParams = append(q.connectionParams, q.host)
+	} else {
+		q.connectionParams = append(q.connectionParams, nil)
+	}
+	q.connectionParams = append(q.connectionParams, q.Namespace)
+	if !username.Empty() {
+		u, err := username.Get()
+		if err != nil {
+			return fmt.Errorf("getting username secret failed: %w", err)
+		}
+		q.connectionParams = append(q.connectionParams, u.String())
+		username.Destroy()
+	}
+	if !password.Empty() {
+		p, err := password.Get()
+		if err != nil {
+			return fmt.Errorf("getting password secret failed: %w", err)
+		}
+		q.connectionParams = append(q.connectionParams, p.String())
+		password.Destroy()
+	}
+
 	// Construct the overall query from the given parts
 	wql := fmt.Sprintf("SELECT %s FROM %s", strings.Join(q.Properties, ", "), q.ClassName)
 	if len(q.Filter) > 0 {
@@ -78,7 +106,8 @@ func (q *Query) execute(acc telegraf.Accumulator) error {
 	defer wmi.Release()
 
 	// service is a SWbemServices
-	serviceRaw, err := oleutil.CallMethod(wmi, "ConnectServer", nil, q.Namespace)
+	serviceRaw, err := oleutil.CallMethod(wmi, "ConnectServer", q.connectionParams...)
+
 	if err != nil {
 		return fmt.Errorf("failed calling method ConnectServer: %w", err)
 	}
@@ -116,6 +145,10 @@ func (q *Query) execute(acc telegraf.Accumulator) error {
 func (q *Query) extractProperties(acc telegraf.Accumulator, itemRaw *ole.VARIANT) error {
 	tags, fields := map[string]string{}, map[string]interface{}{}
 
+	if q.host != "" {
+		tags["source"] = q.host
+	}
+
 	item := itemRaw.ToIDispatch()
 	defer item.Release()
 

plugins/inputs/win_wmi/sample.conf

@@ -1,6 +1,12 @@
 # Input plugin to query Windows Management Instrumentation
 # This plugin ONLY supports Windows
 [[inputs.win_wmi]]
+  ## Hostname or IP for remote connections, by default the local machine is queried
+  # host = ""
+  ## Credentials for the connection, by default no credentials are used
+  # username = ""
+  # password = ""
+
   [[inputs.win_wmi.query]]
     # a string representing the WMI namespace to be queried
     namespace = "root\\cimv2"

plugins/inputs/win_wmi/win_wmi.go

@@ -9,6 +9,7 @@ import (
 	"sync"
 
 	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/config"
 	"github.com/influxdata/telegraf/plugins/inputs"
 )
 
@@ -17,8 +18,11 @@ var sampleConfig string
 
 // Wmi struct
 type Wmi struct {
-	Queries []Query         `toml:"query"`
-	Log     telegraf.Logger `toml:"-"`
+	Host     string          `toml:"host"`
+	Username config.Secret   `toml:"username"`
+	Password config.Secret   `toml:"password"`
+	Queries  []Query         `toml:"query"`
+	Log      telegraf.Logger `toml:"-"`
 }
 
 // S_FALSE is returned by CoInitializeEx if it was already called on this thread.
@@ -28,7 +32,7 @@ const sFalse = 0x00000001
 func (w *Wmi) Init() error {
 	for i := range w.Queries {
 		q := &w.Queries[i]
-		if err := q.prepare(); err != nil {
+		if err := q.prepare(w.Host, w.Username, w.Password); err != nil {
 			return fmt.Errorf("preparing query %q failed: %w", q.ClassName, err)
 		}
 	}