http: Add support for CONNECT proxying to HTTPS locations

Proxying HTTPS traffic requires the proxy providing the
CONNECT method. This implements the client side of it,
although it is a bit hacky.

HTTP connect is a normal HTTP CONNECT request, followed
by a normal HTTP response, just that the body of the
response is the TCP stream of the target host.

We use a special wrapper in case there are data bytes
in the header packets - in that case, the bytes are
stored in a buffer and the buffer will be drained first,
afterwards the connection continues directly with the
TCP stream (with one more vcall).

Also: Do not send full URI to https destinations when proxying,
as we are directly interfacing with the destination data stream.

1 files changed, 3 insertions, 0 deletions

diff --git a/methods/http.h b/methods/http.h
index 3336fb780..7a763675c 100644
--- a/methods/http.h
+++ b/methods/http.h
@@ -73,6 +73,7 @@ class CircleBuf
 
    // Write data out
    bool Write(std::unique_ptr<MethodFd> const &Fd);
+   bool Write(std::string &Data);
    bool WriteTillEl(std::string &Data,bool Single = false);
 
    // Control the write limit
@@ -92,6 +93,8 @@ class CircleBuf
    ~CircleBuf();
 };
 
+bool UnwrapHTTPConnect(std::string To, int Port, URI Proxy, std::unique_ptr<MethodFd> &Fd, unsigned long Timeout, aptMethod *Owner);
+
 struct HttpServerState: public ServerState
 {
    // This is the connection itself. Output is data FROM the server