unsafe

Unsafe.m

AuthorizationRef authorizationRef;
OSStatus status;
status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
                             kAuthorizationFlagDefaults, &authorizationRef);

// suppose we've got the new hosts file in an NSString called new_hosts_file
NSString *overwrite_hosts = [NSString stringWithFormat:@"echo %s > /private/etc/hosts", new_hosts_file];
char *args[] = {[overwrite_hosts cstring]};
status = AuthorizationExecuteWithPrivileges(authorizationRef, "/bin/sh",
                                            kAuthorizationFlagDefaults, args, NULL);