Use TMPDIR with macOS, and set socket SO_SNDBUF and SO_RCVBUF

src/main.rs

@@ -1,4 +1,5 @@
 extern crate byteorder;
+extern crate nix;
 #[cfg(windows)]
 extern crate named_pipe;
 
@@ -10,7 +11,7 @@ mod proxy_socket;
 
 use proxy_socket::ProxySocket;
 
-const BUFFER_SIZE: u32 = 1024 * 16;	 // 1024 ^ 2 is the maximum
+const BUFFER_SIZE: u32 = 1024 ^ 2;	 // 1024 ^ 2 is the maximum
 
 fn valid_length(length: u32) -> bool {
 	return length > 0 && length <= BUFFER_SIZE;
@@ -56,7 +57,7 @@ fn write_response(buf: &[u8]) {
 }
 
 fn main() {
-	let mut socket = proxy_socket::connect().unwrap();
+	let mut socket = proxy_socket::connect(BUFFER_SIZE).unwrap();
 
 	// Start thread for user input reading
 	let ui = thread::spawn(move || {

src/proxy_socket.rs

@@ -2,7 +2,11 @@ use std::env;
 use std::io::{self, Read, Write};
 
 #[cfg(not(windows))]
+use std::os::unix::io::AsRawFd;
 use std::os::unix::net::UnixStream;
+use nix::sys::socket;
+use nix::sys::socket::sockopt::SndBuf;
+use nix::sys::socket::sockopt::RcvBuf;
 
 #[cfg(windows)]
 use named_pipe::PipeClient;
@@ -28,7 +32,7 @@ impl<W: Write> Write for ProxySocket<W> {
 }
 
 #[cfg(windows)]
-pub fn connect() -> io::Result<ProxySocket<PipeClient>> {
+pub fn connect(buffer_size: u32) -> io::Result<ProxySocket<PipeClient>> {
 	let username = env::var("USERNAME").unwrap();
 	let pipe_name = format!("\\\\.\\pipe\\keepassxc\\{}\\kpxc_server", username);
 	let client = PipeClient::connect(pipe_name)?;
@@ -36,17 +40,19 @@ pub fn connect() -> io::Result<ProxySocket<PipeClient>> {
 }
 
 #[cfg(not(windows))]
-pub fn connect() -> io::Result<ProxySocket<UnixStream>> {
+pub fn connect(buffer_size: u32) -> io::Result<ProxySocket<UnixStream>> {
 	use std::time::Duration;
 
 	let socket_name = "kpxc_server";
 	let socket: String;
-	if let Ok(xdg) = env::var("XDG_RUNTIME_DIR") {
-		socket = format!("{}/{}", xdg, socket_name);
+	if let Ok(dir) = if cfg!(target_os = "macos") {env::var("TMPDIR") } else { env::var("XDG_RUNTIME_DIR") } {
+		socket = format!("{}/{}", dir, socket_name);
 	} else {
 		socket = format!("/tmp/{}", socket_name);
 	}
 	let s = UnixStream::connect(socket)?;
+	socket::setsockopt(s.as_raw_fd(), SndBuf, &(buffer_size as usize)).expect("setsockopt for SndBuf failed");
+	socket::setsockopt(s.as_raw_fd(), RcvBuf, &(buffer_size as usize)).expect("setsockopt for RcvBuf failed");
 	let timeout: Option<Duration> = Some(Duration::from_secs(1));
 	s.set_read_timeout(timeout)?;
 	Ok(ProxySocket { inner: s })