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54 lines
2.3 KiB
Objective-C
54 lines
2.3 KiB
Objective-C
#pragma once
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#include <uv.h>
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#include <NetworkExtension/NetworkExtension.h>
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extern NSString* error_domain;
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/**
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* "Trampoline" class that listens for UDP DNS packets when we have exit mode enabled. These arrive
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* on localhost:1053 coming from lokinet's embedded libunbound (when exit mode is enabled), wraps
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* them via NetworkExtension's crappy UDP API, then sends responses back to libunbound to be
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* parsed/etc. This class knows nothing about DNS, it is basically just a UDP packet forwarder, but
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* using Apple magic reinvented wheel wrappers that are oh so wonderful like everything Apple.
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*
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* So for a lokinet configuration of "upstream=1.1.1.1", when exit mode is OFF:
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* - DNS requests go unbound either to 127.0.0.1:53 directly (system extension) or bounced through
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* TUNNELIP:53 (app extension), which forwards them (directly) to the upstream DNS server(s).
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* With exit mode ON:
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* - DNS requests go to unbound, as above, and unbound forwards them to 127.0.0.1:1053, which
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* encapsulates them in Apple's god awful crap, then (on a response) sends them back to
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* libunbound to be delivered back to the requestor.
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* (This assumes a non-lokinet DNS; .loki and .snode get handled before either of these).
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*/
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@interface LLARPDNSTrampoline : NSObject
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{
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// The socket libunbound talks with:
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uv_udp_t request_socket;
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// The reply address. This is a bit hacky: we configure libunbound to just use single address
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// (rather than a range) so that we don't have to worry about tracking different reply addresses.
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@public
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struct sockaddr reply_addr;
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// UDP "session" aimed at the upstream DNS
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@public
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NWUDPSession* upstream;
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// Apple docs say writes could take time *and* the crappy Apple datagram write methods aren't
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// callable again until the previous write finishes. Deal with this garbage API by queuing
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// everything than using a uv_async to process the queue.
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@public
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int write_ready;
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@public
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NSMutableArray<NSData*>* pending_writes;
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uv_async_t write_trigger;
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}
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- (void)startWithUpstreamDns:(NWUDPSession*)dns
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listenIp:(NSString*)listenIp
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listenPort:(uint16_t)listenPort
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uvLoop:(uv_loop_t*)loop
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completionHandler:(void (^)(NSError* error))completionHandler;
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- (void)flushWrites;
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- (void)dealloc;
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@end
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