fix: Fix getpeername for unix sockets adding SocketCall::GetPeerName and using SYS_CALL.

redox-rt/src/protocol.rs

@@ -62,6 +62,7 @@ pub enum SocketCall {
     RecvMsg = 5,
     Unbind = 6,
     GetToken = 7,
+    GetPeerName = 8,
 }
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
@@ -115,6 +116,7 @@ impl SocketCall {
             5 => Self::RecvMsg,
             6 => Self::Unbind,
             7 => Self::GetToken,
+            8 => Self::GetPeerName,
             _ => return None,
         })
     }

src/platform/redox/socket.rs

@@ -658,7 +658,37 @@ impl PalSocket for Sys {
         address: *mut sockaddr,
         address_len: *mut socklen_t,
     ) -> Result<()> {
-        inner_get_name(false, socket, address, address_len)
+        // This is needed until the netstack supports GetPeerName.
+        let (family, _) = socket_domain_type(socket)?;
+
+        match family {
+            AF_INET => inner_get_name(false, socket, address, address_len),
+            AF_UNIX => {
+                let mut buf = [0; 256];
+                let len = redox_rt::sys::sys_call(
+                    socket as usize,
+                    &mut buf,
+                    CallFlags::empty(),
+                    &[SocketCall::GetPeerName as u64],
+                )?;
+                if buf.starts_with(b"/scheme/uds_stream/") {
+                    inner_af_unix(&buf[19..len], address, address_len);
+                } else if buf.starts_with(b"/scheme/uds_dgram/") {
+                    inner_af_unix(&buf[18..len], address, address_len);
+                } else {
+                    // Socket doesn't belong to any scheme
+                    trace!(
+                        "socket {:?} doesn't match either tcp, udp or chan schemes",
+                        str::from_utf8(buf)
+                    );
+                    return Err(Errno(ENOTSOCK));
+                }
+                Ok(())
+            }
+            _ => {
+                return Err(Errno(EAFNOSUPPORT));
+            }
+        }
     }
 
     unsafe fn getsockname(