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winnpc.c: add low-level connect_to_named_pipe() function.

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This contains most of the guts of the previously monolithic function
new_named_pipe_client(), but it directly returns the HANDLE to the
opened pipe, or a string error message on failure.

new_named_pipe_client() is now a thin veneer on top of that, which
returns a Socket * by wrapping up the HANDLE into a HandleSocket or
the error message into an ErrorSocket as appropriate.

So it's now possible to connect to a named pipe, using all our usual
infrastructure (including in particular the ownership check of the
server, to defend against spoofing attacks), without having to have a
Socket-capable event loop in progress.
This commit is contained in:
Simon Tatham
2020-01-01 18:58:11 +00:00
parent e305974313
commit 39248737a4
4 changed files with 39 additions and 14 deletions
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6
windows/winstuff.h
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@ -373,6 +373,12 @@ Socket *make_handle_socket(HANDLE send_H, HANDLE recv_H, HANDLE stderr_H,
Socket *new_named_pipe_client(const char *pipename, Plug *plug); /* winnpc */
Socket *new_named_pipe_listener(const char *pipename, Plug *plug); /* winnps */
/* A lower-level function in winnpc.c, which does most of the work of
* new_named_pipe_client (including checking the ownership of what
* it's connected to), but returns a plain HANDLE instead of wrapping
* it into a Socket. */
HANDLE connect_to_named_pipe(const char *pipename, char **err);
/*
* Exports from winctrls.c.
*/