set_dns/
set_dns.rs

1use core_foundation::{
2    array::CFArray,
3    base::{TCFType, ToVoid},
4    dictionary::CFDictionary,
5    propertylist::CFPropertyList,
6    string::{CFString, CFStringRef},
7};
8use system_configuration::{
9    dynamic_store::{SCDynamicStore, SCDynamicStoreBuilder},
10    sys::schema_definitions::{kSCDynamicStorePropNetPrimaryService, kSCPropNetDNSServerAddresses},
11};
12
13// This example will change the DNS settings on the primary
14// network interface to 8.8.8.8 and 8.8.4.4
15
16fn main() {
17    let store = SCDynamicStoreBuilder::new("my-test-dyn-store").build();
18    let primary_service_uuid = get_primary_service_uuid(&store).expect("No PrimaryService active");
19    println!("PrimaryService UUID: {}", primary_service_uuid);
20
21    let primary_service_path = CFString::new(&format!(
22        "State:/Network/Service/{}/DNS",
23        primary_service_uuid
24    ));
25    println!("PrimaryService path: {}", primary_service_path);
26
27    let dns_dictionary = create_dns_dictionary(&[
28        CFString::from_static_string("8.8.8.8"),
29        CFString::from_static_string("8.8.4.4"),
30    ]);
31
32    let success = store.set(primary_service_path, dns_dictionary);
33    println!("success? {}", success);
34}
35
36fn get_primary_service_uuid(store: &SCDynamicStore) -> Option<CFString> {
37    let dictionary = store
38        .get("State:/Network/Global/IPv4")
39        .and_then(CFPropertyList::downcast_into::<CFDictionary>)?;
40    dictionary
41        .find(unsafe { kSCDynamicStorePropNetPrimaryService }.to_void())
42        .map(|ptr| unsafe { CFString::wrap_under_get_rule(*ptr as CFStringRef) })
43}
44
45fn create_dns_dictionary(addresses: &[CFString]) -> CFDictionary {
46    let key = unsafe { CFString::wrap_under_get_rule(kSCPropNetDNSServerAddresses) };
47    let value = CFArray::from_CFTypes(addresses);
48    let typed_dict = CFDictionary::from_CFType_pairs(&[(key, value)]);
49    unsafe { CFDictionary::wrap_under_get_rule(typed_dict.as_concrete_TypeRef()) }
50}
set_dns/set_dns.rs

set_dns/
set_dns.rs
