Use interprocess for synchronous pipes on Windows

See: <mid:O-HTpA2--3-9@dos.cafe>
Signed-off-by: Wiktor Kwapisiewicz <wiktor@metacode.biz>

Author: wiktor-k

Cargo.lock

@@ -57,3 +57,4 @@ secrecy = "0.8.0"
 retainer = "0.3.0"
 pgp = "0.12.0-alpha.3"
 chrono = "0.4.38"
+interprocess = "2.2.0"

Cargo.toml

@@ -1,13 +1,21 @@
 mod extensions;
 
 #[cfg(unix)]
-fn main() -> testresult::TestResult {
-    use std::os::unix::net::UnixStream;
+use std::os::unix::net::UnixStream;
 
-    use extensions::{DecryptIdentities, RequestDecryptIdentities};
-    use ssh_agent_lib::{blocking::Client, proto::Extension};
+use extensions::{DecryptIdentities, RequestDecryptIdentities};
+#[cfg(windows)]
+use interprocess::os::windows::named_pipe::*;
+use ssh_agent_lib::{blocking::Client, proto::Extension};
 
-    let mut client = Client::new(UnixStream::connect(std::env::var("SSH_AUTH_SOCK")?)?);
+fn main() -> testresult::TestResult {
+    let socket = std::env::var("SSH_AUTH_SOCK")?;
+    #[cfg(unix)]
+    let mut client = Client::new(UnixStream::connect(socket)?);
+    #[cfg(windows)]
+    let mut client = Client::new(DuplexPipeStream::<pipe_mode::Bytes>::connect_by_path(
+        socket,
+    )?);
 
     eprintln!(
         "Identities that this agent knows of: {:#?}",
@@ -25,8 +33,3 @@ fn main() -> testresult::TestResult {
 
     Ok(())
 }
-
-#[cfg(windows)]
-fn main() {
-    eprintln!("Sadly, there are no high-quality sync named pipe crates as of 2024");
-}