Add support in simulator for mtus

tools/httpd_sim.c

@@ -286,6 +286,30 @@ void send_lag(int s)
 }
 
 
+void send_mtu(int s)
+{
+	struct json_object *mtus, *v;
+	const char *jstring;
+        char *header = "HTTP/1.1 200 OK\r\n"
+                         "Content-Type: application/json; charset=UTF-8\r\n\r\n";
+
+	mtus = json_object_new_array_ext(PORTS);
+	char mtu[8];
+	for (int i = 1; i <= PORTS; i++) {
+		v = json_object_new_object();
+		json_object_object_add(v, "portNum", json_object_new_int(i));
+		sprintf(mtu, "0x%04x", i % 2 ? 16383 : 1522);
+		json_object_object_add(v, "mtu", json_object_new_string(mtu));
+		json_object_array_add(mtus, v);
+	}
+        write(s, header, strlen(header));
+
+	jstring = json_object_to_json_string_ext(mtus, JSON_C_TO_STRING_PLAIN);
+        write(s, jstring, strlen(jstring));
+	json_object_put(mtus);
+}
+
+
 void send_cmd_log(int s)
 {
         char *header = "HTTP/1.1 200 OK\r\n"
@@ -494,6 +518,13 @@ void launch(struct Server *server)
 					else
 						send_lag(new_socket);
 					goto done;
+				} else if (!strncmp(&buffer[4], "/mtu.json", 9)) {
+					printf("MTU request\n");
+					if (!authenticated)
+						send_unauthorized(new_socket);
+					else
+						send_mtu(new_socket);
+					goto done;
 				} else if (!strncmp(&buffer[4], "/vlan.json?vid=", 15)) {
 					int vlan = atoi(&buffer[19]);
 					printf("VLAN request for %d\n", vlan);