docs: update protocols

docs/src/content/concepts-protocols.md

@@ -13,17 +13,13 @@ Most protocols can be disabled by toggling the respective [option]({{< relref co
 
 ## HTTP/1.x
 
-HTTP/1.0 and HTTP/1.1 support in mitmproxy is based on our custom HTTP stack, which is particularly robust to HTTP syntax
+HTTP/1.0 and HTTP/1.1 support in mitmproxy is based on our custom HTTP stack based on 
+[h11](https://github.com/python-hyper/h11), which is particularly robust to HTTP syntax
 errors. Protocol violations are often deliberately forwarded or inserted at the proxy.
 
 ##### Known Limitations
 
-- Trailers: mitmproxy currently does not support HTTP trailers, but we are happy to accept contributions.
-
-##### RFCs
-
-- [RFC7230: HTTP/1.1: Message Syntax and Routing](http://tools.ietf.org/html/rfc7230)
-- [RFC7231: HTTP/1.1: Semantics and Content](http://tools.ietf.org/html/rfc7231)
+- Trailers: mitmproxy currently does not support trailers with HTTP/1.x, but we are happy to accept contributions.
 
 ## HTTP/2
 
@@ -32,16 +28,11 @@ server does not speak HTTP/2, mitmproxy seamlessly translates messages to HTTP/1
 
 ##### Known Limitations
 
-- *Trailers*: mitmproxy currently does not support HTTP trailers, but we are happy to accept contributions.
 - *Priority Information*: mitmproxy currently ignores HTTP/2 PRIORITY frames. This does not affect the transmitted
   contents, but potentially affects the order in which messages are sent.
 - *Push Promises*: mitmproxy currently does not advertise support for HTTP/2 Push Promises.
 - *Cleartext HTTP/2*: mitmproxy currently does not support unencrypted HTTP/2 (h2c).
 
-##### RFCs
-
-- [RFC7540: Hypertext Transfer Protocol Version 2 (HTTP/2)](http://tools.ietf.org/html/rfc7540)
-
 ## WebSocket
 
 WebSocket support in mitmproxy is based on [wsproto](https://github.com/python-hyper/wsproto) project, including support
@@ -49,19 +40,23 @@ for message compression.
 
 ##### Known Limitations
 
-- *User Interface*: WebSocket messages are currently logged to the event log, but not displayed in the console or web
-  interface. We would welcome contributions that fix this issue.
 - *Replay*: Client or server replay is not possible yet.
 - *Ping*: mitmproxy will forward PING and PONG frames, but not store them. The payload is only logged to the event log.
 - *Unknown Extensions*: Unknown WebSocket extensions will cause a warning message to be logged, but are otherwise passed
   through as-is. This may lead to noncompliant behavior.
 
-##### RFCs
+## DNS
 
-- [RFC6455: The WebSocket Protocol](http://tools.ietf.org/html/rfc6455)
-- [RFC7692: Compression Extensions for WebSocket](http://tools.ietf.org/html/rfc7692)
+DNS support in mitmproxy is based on a custom DNS implementation.
 
-## Generic TCP Proxy
+##### Known Limitations
+
+- *Replay*: Client or server replay is not possible yet.
+- mitmproxy current does not support DNS over TCP.
+- We have not started any work on DoT/DoH/DoQ (DNS-over-TLS/HTTPS/QUIC) yet. Contributions are welcome.
+- We have not started any work on stripping ESNI or HTTPS RR records yet. Contributions are welcome.
+
+## Generic TCP/TLS Proxy
 
 Mitmproxy can also act as a generic TCP proxy. In this mode, mitmproxy will still detect the presence of TLS at the
 beginning of a connection and perform a man-in-the-middle attack if necessary, but otherwise forward messages
@@ -73,3 +68,16 @@ Users can explicitly opt into generic TCP proxying by setting the [`tcp_hosts` o
 
 - *Replay*: Client or server replay is not possible yet.
 - *Opportunistic TLS*: mitmproxy will not detect when a plaintext protocol upgrades to TLS (STARTTLS).
+
+
+## Generic UDP/DTLS Proxy
+
+Mitmproxy can also act as a generic UDP proxy. In this mode, mitmproxy will still detect the presence of DTLS at the
+beginning of a connection and perform a man-in-the-middle attack if necessary, but otherwise forward messages
+unmodified.
+
+Users can explicitly opt into generic UDP proxying by setting the [`udp_hosts` option]({{< relref concepts-options >}}).
+
+##### Known Limitations
+
+- *Replay*: Client or server replay is not possible yet.

mitmproxy/addons/dns_resolver.py

@@ -151,6 +151,7 @@ class DnsResolver:
             and not flow.error
         )
         if should_resolve:
+            # TODO: We need to handle overly long responses here.
             flow.response = await resolve_message(
                 flow.request, asyncio.get_running_loop()
             )