127 lines
3.7 KiB
Objective-C
127 lines
3.7 KiB
Objective-C
//
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// WireGuardGoWrapper.m
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// WireGuardNetworkExtension
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//
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// Created by Jeroen Leenarts on 21-06-18.
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// Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All rights reserved.
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//
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#include <os/log.h>
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#include "wireguard.h"
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#import "WireGuardGoWrapper.h"
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/// Trampoline function
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static ssize_t do_read(const void *ctx, const unsigned char *buf, size_t len);
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/// Trampoline function
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static ssize_t do_write(const void *ctx, const unsigned char *buf, size_t len);
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/// Trampoline function
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static void do_log(int level, const char *tag, const char *msg);
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@interface WireGuardGoWrapper ()
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@property (nonatomic, assign) int handle;
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@property (nonatomic, assign) BOOL isClosed;
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@property (nonatomic, strong) NSMutableArray<NSData *> *packets;
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@property (nonatomic, strong) NSMutableArray<NSNumber *> *protocols;
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@property (nonatomic, strong) NSCondition *condition;
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@end
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@implementation WireGuardGoWrapper
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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self.condition = [NSCondition new];
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}
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return self;
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}
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- (BOOL) turnOnWithInterfaceName: (NSString *)interfaceName settingsString: (NSString *)settingsString
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{
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os_log([WireGuardGoWrapper log], "WireGuard Go Version %{public}s", wgVersion());
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wgSetLogger(do_log);
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const char * ifName = [interfaceName UTF8String];
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const char * settings = [settingsString UTF8String];
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self.handle = wgTurnOn((gostring_t){ .p = ifName, .n = interfaceName.length }, (gostring_t){ .p = settings, .n = settingsString.length }, do_read, do_write, (__bridge void *)(self));
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return self.handle >= 0;
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}
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- (void) turnOff
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{
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self.isClosed = YES;
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wgTurnOff(self.handle);
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}
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+ (NSString *)versionWireGuardGo {
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return [NSString stringWithUTF8String:wgVersion()];
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}
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+ (os_log_t)log {
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static os_log_t subLog = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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subLog = os_log_create("com.wireguard.ios.WireGuard.WireGuardNetworkExtension", "WireGuard-Go");
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});
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return subLog;
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}
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@end
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static ssize_t do_read(const void *ctx, const unsigned char *buf, size_t len)
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{
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WireGuardGoWrapper *wrapper = (__bridge WireGuardGoWrapper *)ctx;
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if (wrapper.isClosed) return -1;
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if (wrapper.packets.count == 0) {
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
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[wrapper.packetFlow readPacketsWithCompletionHandler:^(NSArray<NSData *> * _Nonnull packets, NSArray<NSNumber *> * _Nonnull protocols) {
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[wrapper.packets addObjectsFromArray:packets];
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[wrapper.protocols addObjectsFromArray:protocols];
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[wrapper.condition signal];
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}];
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});
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[wrapper.condition wait];
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}
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NSData *packet = [wrapper.packets objectAtIndex:0];
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// NSNumber *protocol = [wrapper.protocols objectAtIndex:0];
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[wrapper.packets removeObjectAtIndex:0];
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[wrapper.protocols removeObjectAtIndex:0];
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NSUInteger packetLength = [packet length];
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if (packetLength > len) {
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// The packet will be dropped when we end up here.
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return 0;
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}
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memcpy(buf, [packet bytes], packetLength);
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return packetLength;
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}
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static ssize_t do_write(const void *ctx, const unsigned char *buf, size_t len)
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{
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WireGuardGoWrapper *wrapper = (__bridge WireGuardGoWrapper *)ctx;
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//TODO: determine IPv4 or IPv6 status.
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NSData *packet = [[NSData alloc] initWithBytes:buf length:len];
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[wrapper.packetFlow writePackets:@[packet] withProtocols:@[@AF_INET]];
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return len;
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}
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static void do_log(int level, const char *tag, const char *msg)
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{
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// TODO Get some details on the log level and distribute to matching log levels.
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os_log([WireGuardGoWrapper log], "Log level %d for %{public}s: %{public}s", level, tag, msg);
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}
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