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//
// WireGuardGoWrapper.m
// WireGuardNetworkExtension
//
// Created by Jeroen Leenarts on 21-06-18.
// Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All rights reserved.
//
#include <os/log.h>
#include "wireguard.h"
#import "WireGuardGoWrapper.h"
/// Trampoline function
static ssize_t do_read(const void *ctx, const unsigned char *buf, size_t len);
/// Trampoline function
static ssize_t do_write(const void *ctx, const unsigned char *buf, size_t len);
/// Trampoline function
static void do_log(int level, const char *tag, const char *msg);
@interface WireGuardGoWrapper ()
@property (nonatomic, assign) int handle;
@property (nonatomic, assign) BOOL isClosed;
@property (nonatomic, strong) NSMutableArray<NSData *> *packets;
@property (nonatomic, strong) NSMutableArray<NSNumber *> *protocols;
@property (nonatomic, strong) dispatch_queue_t dispatchQueue;
@property (nonatomic, strong) NSCondition *condition;
@end
@implementation WireGuardGoWrapper
- (instancetype)init
{
self = [super init];
if (self) {
self.packets = [[NSMutableArray alloc]initWithCapacity:100];
self.handle = -1;
self.configured = false;
self.condition = [NSCondition new];
self.dispatchQueue = dispatch_queue_create("manager", NULL);
}
return self;
}
- (BOOL) turnOnWithInterfaceName: (NSString *)interfaceName settingsString: (NSString *)settingsString
{
os_log([WireGuardGoWrapper log], "WireGuard Go Version %{public}s", wgVersion());
wgSetLogger(do_log);
const char * ifName = [interfaceName UTF8String];
const char * settings = [settingsString UTF8String];
self.handle = wgTurnOn((gostring_t){ .p = ifName, .n = interfaceName.length }, (gostring_t){ .p = settings, .n = settingsString.length }, do_read, do_write, (__bridge void *)(self));
return self.handle >= 0;
}
- (void) turnOff
{
self.isClosed = YES;
self.configured = NO;
wgTurnOff(self.handle);
self.handle = -1;
}
- (void) startReadingPackets {
[self readPackets];
}
- (void) readPackets {
dispatch_async(self.dispatchQueue, ^{
if (self.isClosed || self.handle < 0 || !self.configured ) {
[self readPackets];
return;
}
os_log_debug([WireGuardGoWrapper log], "readPackets - read call - on thread \"%{public}@\" - %d", NSThread.currentThread.name, (int)NSThread.currentThread);
[self.packetFlow readPacketsWithCompletionHandler:^(NSArray<NSData *> * _Nonnull packets, NSArray<NSNumber *> * _Nonnull protocols) {
[self.condition lock];
@synchronized(self.packets) {
[self.packets addObjectsFromArray:packets];
[self.protocols addObjectsFromArray:protocols];
}
os_log_debug([WireGuardGoWrapper log], "readPackets - signal - on thread \"%{public}@\" - %d", NSThread.currentThread.name, (int)NSThread.currentThread);
[self.condition signal];
[self.condition unlock];
[self readPackets];
}];
});
}
+ (NSString *)versionWireGuardGo {
return [NSString stringWithUTF8String:wgVersion()];
}
+ (os_log_t)log {
static os_log_t subLog = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
subLog = os_log_create("com.wireguard.ios.WireGuard.WireGuardNetworkExtension", "WireGuard-Go");
});
return subLog;
}
@end
static ssize_t do_read(const void *ctx, const unsigned char *buf, size_t len)
{
@autoreleasepool {
os_log_debug([WireGuardGoWrapper log], "do_read - start - on thread \"%{public}@\" - %d", NSThread.currentThread.name, (int)NSThread.currentThread);
WireGuardGoWrapper *wrapper = (__bridge WireGuardGoWrapper *)ctx;
if (wrapper.isClosed) return -1;
if (wrapper.handle < 0 || !wrapper.configured ) {
os_log_debug([WireGuardGoWrapper log], "do_read - early - on thread \"%{public}@\" - %d", NSThread.currentThread.name, (int)NSThread.currentThread);
return 0;
}
NSData * __block packet = nil;
// NSNumber *protocol = nil;
dispatch_sync(wrapper.dispatchQueue, ^{
[wrapper.condition lock];
@synchronized(wrapper.packets) {
if (wrapper.packets.count == 0) {
os_log_debug([WireGuardGoWrapper log], "do_read - no packet - on thread \"%{public}@\" - %d", NSThread.currentThread.name, (int)NSThread.currentThread);
return;
}
packet = [wrapper.packets objectAtIndex:0];
// protocol = [wrapper.protocols objectAtIndex:0];
[wrapper.packets removeObjectAtIndex:0];
[wrapper.protocols removeObjectAtIndex:0];
}
});
if (packet == nil) {
os_log_debug([WireGuardGoWrapper log], "do_read - wait - on thread \"%{public}@\" - %d", NSThread.currentThread.name, (int)NSThread.currentThread);
[wrapper.condition wait];
[wrapper.condition unlock];
return 0;
} else {
[wrapper.condition unlock];
}
NSUInteger packetLength = [packet length];
if (packetLength > len) {
// The packet will be dropped when we end up here.
os_log_debug([WireGuardGoWrapper log], "do_read - drop - on thread \"%{public}@\" - %d", NSThread.currentThread.name, (int)NSThread.currentThread);
return 0;
}
memcpy(buf, [packet bytes], packetLength);
os_log_debug([WireGuardGoWrapper log], "do_read - packet - on thread \"%{public}@\" - %d", NSThread.currentThread.name, (int)NSThread.currentThread);
return packetLength;
}
}
static ssize_t do_write(const void *ctx, const unsigned char *buf, size_t len)
{
@autoreleasepool {
os_log_debug([WireGuardGoWrapper log], "do_write - start");
WireGuardGoWrapper *wrapper = (__bridge WireGuardGoWrapper *)ctx;
//TODO: determine IPv4 or IPv6 status.
NSData *packet = [[NSData alloc] initWithBytes:buf length:len];
[wrapper.packetFlow writePackets:@[packet] withProtocols:@[@AF_INET]];
return len;
}
}
static void do_log(int level, const char *tag, const char *msg)
{
@autoreleasepool {
// TODO Get some details on the log level and distribute to matching log levels.
os_log([WireGuardGoWrapper log], "Log level %d for %{public}s: %{public}s", level, tag, msg);
}
}
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