Fix handling of -o with FileFormat and Local

cli/commandline.go

@@ -411,6 +411,14 @@ func dbFlags(conf *config.Config) {
 
 // handle generic sounding c2 flags.
 func c2Flags(c2Selection *string, conf *config.Config) {
+
+	flag.BoolVar(&conf.ThirdPartyC2Server, "o", false, "Indicates if the reverse shell should be caught by an outside program (nc, openssl)")
+
+	if len(conf.SupportedC2) == 0 {
+		// the implementing exploit doesn't support any c2, just exit
+		return
+	}
+
 	c2Default, _ := c2.ImplToString(conf.SupportedC2[0])
 	c2Available := "The C2 server implementation to use. Supported: "
 	for _, value := range conf.SupportedC2 {
@@ -437,15 +445,13 @@ func c2Flags(c2Selection *string, conf *config.Config) {
 	} else {
 		flag.IntVar(&conf.C2Timeout, "t", 30, "The number of seconds to listen for reverse shells.")
 	}
-
-	flag.BoolVar(&conf.ThirdPartyC2Server, "o", false, "Indicates if the reverse shell should be caught by an outside program (nc, openssl)")
 }
 
 // loop through the c2 the exploit supports and find the one the user actually selected.
 func validateC2Selection(c2Selection string, conf *config.Config) bool {
 	c2Selected, ok := c2.StringToImpl(c2Selection)
 	if !ok {
-		output.PrintFrameworkError("Provided an invalid c2 implementation")
+		output.PrintFrameworkError("The user provided an invalid c2 implementation")
 
 		return false
 	}
@@ -679,7 +685,9 @@ func FormatFileCmdLineParse(conf *config.Config) bool {
 
 		return false
 	}
-	if !validateC2Selection(c2Selection, conf) {
+
+	// must be validate (to set default for payload gen) and then check third party c2
+	if validateC2Selection(c2Selection, conf) && !conf.ThirdPartyC2Server {
 		return false
 	}
 	if !conf.ThirdPartyC2Server && (conf.Lport == 0 || len(conf.Lhost) == 0) {
@@ -715,7 +723,8 @@ func LocalCmdLineParse(conf *config.Config) bool {
 	}
 	flag.Parse()
 
-	if !validateC2Selection(c2Selection, conf) {
+	// must be validate (to set default for payload gen) and then check third party c2
+	if validateC2Selection(c2Selection, conf) && !conf.ThirdPartyC2Server {
 		return false
 	}