diff --git a/src/easy/handler.rs b/src/easy/handler.rs
index 2b20a487f..044ce67f7 100644
--- a/src/easy/handler.rs
+++ b/src/easy/handler.rs
@@ -9,8 +9,10 @@ use std::slice;
 use std::str;
 use std::time::Duration;
 
-use libc::{c_char, c_double, c_int, c_long, c_ulong, c_void, size_t};
+use libc::{c_char, c_double, c_int, c_long, c_uint, c_ulong, c_void, size_t};
 use socket2::Socket;
+#[cfg(windows)]
+use windows_sys::Win32::Networking::WinSock::SOCKADDR;
 
 use crate::easy::form;
 use crate::easy::list;
@@ -271,12 +273,16 @@ pub trait Handler {
     /// triggered this callback.
     ///
     /// By default this function opens a standard socket and
-    /// corresponds to `CURLOPT_OPENSOCKETFUNCTION `.
+    /// corresponds to `CURLOPT_OPENSOCKETFUNCTION`.
     fn open_socket(
         &mut self,
+        _purpose: curl_sys::curlsocktype,
         family: c_int,
         socktype: c_int,
         protocol: c_int,
+        _address_length: c_uint,
+        #[cfg(unix)] _address_data: libc::sockaddr,
+        #[cfg(windows)] _address_data: SOCKADDR,
     ) -> Option<curl_sys::curl_socket_t> {
         // Note that we override this to calling a function in `socket2` to
         // ensure that we open all sockets with CLOEXEC. Otherwise if we rely on
@@ -3651,16 +3657,22 @@ extern "C" fn ssl_ctx_cb<H: Handler>(
     res.unwrap_or(curl_sys::CURLE_SSL_CONNECT_ERROR)
 }
 
-// TODO: expose `purpose` and `sockaddr` inside of `address`
 extern "C" fn opensocket_cb<H: Handler>(
     data: *mut c_void,
-    _purpose: curl_sys::curlsocktype,
+    purpose: curl_sys::curlsocktype,
     address: *mut curl_sys::curl_sockaddr,
 ) -> curl_sys::curl_socket_t {
     let res = panic::catch(|| unsafe {
         (*(data as *mut Inner<H>))
             .handler
-            .open_socket((*address).family, (*address).socktype, (*address).protocol)
+            .open_socket(
+                purpose,
+                (*address).family,
+                (*address).socktype,
+                (*address).protocol,
+                (*address).addrlen,
+                (*address).addr,
+            )
             .unwrap_or(curl_sys::CURL_SOCKET_BAD)
     });
     res.unwrap_or(curl_sys::CURL_SOCKET_BAD)