Add sandbox set_dns helper bin

Author: faern

system-configuration/src/bin/set_dns.rs

@@ -0,0 +1,44 @@
+extern crate system_configuration;
+extern crate system_configuration_sys;
+
+extern crate core_foundation;
+extern crate core_foundation_sys;
+
+use core_foundation::array::CFArray;
+use core_foundation::base::TCFType;
+use core_foundation::dictionary::CFDictionary;
+use core_foundation::string::{CFString, CFStringRef};
+
+use system_configuration::dynamic_store::SCDynamicStore;
+
+fn main() {
+    unsafe {
+        let store = SCDynamicStore::create("my-test-dyn-store");
+        println!("Created dynamic store");
+
+        let ipv4_dict = store
+            .get("State:/Network/Global/IPv4")
+            .expect("Unable to find global settings");
+        println!("Got IPv4 global property list");
+
+        let pri_service_id_ptr = ipv4_dict
+            .find2(&CFString::from_static_string("PrimaryService"))
+            .expect("No PrimaryService");
+        let pri_service_id = CFString::wrap_under_get_rule(pri_service_id_ptr as CFStringRef);
+
+        let pri_service_path =
+            CFString::new(&format!("State:/Network/Service/{}/DNS", pri_service_id));
+        println!("PrimaryService path: {}", pri_service_path);
+
+        let server_addresses_key = CFString::from_static_string("ServerAddresses");
+        let server_addresses_value = CFArray::from_CFTypes(&[
+            CFString::from_static_string("8.8.8.8"),
+            CFString::from_static_string("8.8.4.4"),
+        ]);
+        let dns_dictionary =
+            CFDictionary::from_CFType_pairs(&[(server_addresses_key, server_addresses_value)]);
+
+        let success = store.set(pri_service_path, &dns_dictionary);
+        println!("success? {}", success);
+    }
+}