Add basic RTR example.

examples/falcon_rtr_read_only_command/README.md

@@ -0,0 +1,27 @@
+This is a working standalone example of a program to run a basic read-only RTR command against a specific agent.
+
+## Build
+```
+go get github.com/crowdstrike/gofalcon/examples/falcon_rtr_read_only_command
+```
+
+## Setup Environment Variables
+```
+# Highly recommended to set at least the client ID and secret
+# as environment variables. Credentials should not be entered
+# on the command line, so as not to pollute the command history.
+export FALCON_CLIENT_ID="your_falcon_id"
+export FALCON_CLIENT_SECRET="your_falcon_secret"
+export FALCON_CLOUD="us-1, us-2, eu-1, us-gov-1, etc"
+
+# AID and command are more likely to vary and are not sensitive,
+# so are a more natural fit for command line arguments.
+export FALCON_AGENT_ID="def"
+export FALCON_RTR_COMMAND="users"
+```
+
+## Usage
+```
+$ FALCON_CLIENT_ID="abc" FALCON_CLIENT_SECRET="XYZ" FALCON_CLOUD=us-1 \
+      falcon_rtr_read_only_command --aid "def" --cmd "users"
+```

examples/falcon_rtr_read_only_command/main.go

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+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/crowdstrike/gofalcon/falcon"
+	"github.com/crowdstrike/gofalcon/pkg/falcon_util"
+)
+
+func main() {
+	clientId := flag.String("client-id", os.Getenv("FALCON_CLIENT_ID"), "Client ID for accessing CrowdStrike Falcon Platform (default taken from FALCON_CLIENT_ID env)")
+	clientSecret := flag.String("client-secret", os.Getenv("FALCON_CLIENT_SECRET"), "Client Secret for accessing CrowdStrike Falcon Platform (default taken from FALCON_CLIENT_SECRET)")
+	clientCloud := flag.String("cloud", os.Getenv("FALCON_CLOUD"), "Falcon cloud abbreviation (us-1, us-2, eu-1, us-gov-1; default taken from FALCON_CLOUD)")
+	aid := flag.String("aid", os.Getenv("FALCON_AGENT_ID"), "Falcon agent ID on which to run the command (default taken from FALCON_AGENT_ID)")
+	cmd := flag.String("cmd", os.Getenv("FALCON_RTR_COMMAND"), "RTR command to run on the specified agent. (default taken from FALCON_RTR_COMMAND)")
+
+	flag.Parse()
+	if *clientId == "" {
+		*clientId = falcon_util.PromptUser(`Missing FALCON_CLIENT_ID environment variable. Please provide your OAuth2 API Client ID for authentication with CrowdStrike Falcon platform. Establishing and retrieving OAuth2 API credentials can be performed at https://falcon.crowdstrike.com/support/api-clients-and-keys.
+Falcon Client ID`)
+	}
+	if *clientSecret == "" {
+		*clientSecret = falcon_util.PromptUser(`Missing FALCON_CLIENT_SECRET environment variable. Please provide your OAuth2 API Client Secret for authentication with CrowdStrike Falcon platform. Establishing and retrieving OAuth2 API credentials can be performed at https://falcon.crowdstrike.com/support/api-clients-and-keys.
+Falcon Client Secret`)
+	}
+	if *aid == "" {
+		*aid = falcon_util.PromptUser(`Missing FALCON_AGENT_ID. Please provide the ID of the agent you would like to communicate with.
+Falcon agent ID`)
+	}
+	if *cmd == "" {
+		*cmd = falcon_util.PromptUser(`Missing FALCON_RTR_COMMAND. Please provide the RTR command you would like to run. See https://falcon.crowdstrike.com/documentation/71/real-time-response-and-network-containment#rtr_commands for a list of RTR Read Only Analyst commands.
+Falcon RTR command`)
+	}
+
+	client, err := falcon.NewRTR(&falcon.ApiConfig{
+		ClientId:     *clientId,
+		ClientSecret: *clientSecret,
+		Cloud:        falcon.Cloud(*clientCloud),
+		Context:      context.Background(),
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	session, err := client.NewSession(context.Background(), *aid)
+	if err != nil {
+		panic(falcon.ErrorExplain(err))
+	}
+	result, err := session.ExecuteAndWait(context.Background(), strings.Split(*cmd, " ")[0], *cmd)
+	if err != nil {
+		panic(falcon.ErrorExplain(err))
+	}
+
+	json, _ := falcon_util.PrettyJson(result)
+	fmt.Println(json)
+}