83 lines
2.5 KiB
Objective-C
83 lines
2.5 KiB
Objective-C
//
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// DNS.m
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// TunnelKit
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//
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// Created by Davide De Rosa on 4/25/19.
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// Copyright (c) 2019 Davide De Rosa. All rights reserved.
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//
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// https://github.com/keeshux
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//
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// This file is part of TunnelKit.
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//
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// TunnelKit is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// TunnelKit is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with TunnelKit. If not, see <http://www.gnu.org/licenses/>.
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//
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// adapted from: https://stackoverflow.com/questions/31256024/get-dns-server-ip-from-iphone-settings
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#import <resolv.h>
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#import <netdb.h>
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#import "DNS.h"
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@implementation DNS {
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res_state _state;
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}
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- (instancetype)init
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{
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if (self = [super init]) {
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_state = malloc(sizeof(struct __res_state));
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if (EXIT_SUCCESS != res_ninit(_state)) {
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free(_state);
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return nil;
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}
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}
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return self;
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}
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- (void)dealloc
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{
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res_ndestroy(_state);
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free(_state);
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}
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- (NSArray<NSString *> *)systemServers
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{
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NSMutableArray *addresses = [[NSMutableArray alloc] init];
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union res_sockaddr_union servers[NI_MAXSERV];
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const int found = res_9_getservers(_state, servers, NI_MAXSERV);
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char hostBuffer[NI_MAXHOST];
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for (int i = 0; i < found; ++i) {
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union res_sockaddr_union s = servers[i];
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if (s.sin.sin_len <= 0) {
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continue;
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}
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if (EXIT_SUCCESS == getnameinfo((struct sockaddr *)&s.sin, // Pointer to your struct sockaddr
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(socklen_t)s.sin.sin_len, // Size of this struct
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(char *)&hostBuffer, // Pointer to hostname string
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sizeof(hostBuffer), // Size of this string
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nil, // Pointer to service name string
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0, // Size of this string
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NI_NUMERICHOST)) { // Flags given
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[addresses addObject:[NSString stringWithUTF8String:hostBuffer]];
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}
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}
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return addresses;
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}
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@end
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