From 63aab7ac772622173f38309cc9ed5b0cd11ea58f Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tomasz@kramkow.ski>
Date: Sun, 29 Jan 2023 16:55:04 +0000
Subject: Begin removing pam-bindings dependency

---
 src/lib.rs | 38 ++++++++++++++++++++++----------------
 1 file changed, 22 insertions(+), 16 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 3bcc68c..e7b6edc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,9 +2,8 @@
 // SPDX-License-Identifier: MIT
 
 use cap_std::fs::{Dir, OpenOptions};
-use pam::constants::{PamFlag, PamResultCode};
-use pam::module::{PamHandle, PamHooks};
-use std::ffi::CStr;
+use pam::module::PamHandle;
+use std::ffi::{c_char, c_int};
 use std::io::{ErrorKind, Write};
 use std::panic;
 use std::path::Path;
@@ -48,18 +47,25 @@ fn open_session(h: &PamHandle, mountpoint: &str) -> Result<(), SessionError> {
 
 const CG_MOUNT: &str = "/sys/fs/cgroup";
 
-struct PAMUserCG;
-pam::pam_hooks!(PAMUserCG);
-
-impl PamHooks for PAMUserCG {
-    fn sm_open_session(
-        h: &mut PamHandle,
-        _args: Vec<&CStr>,
-        _flags: PamFlag,
-    ) -> PamResultCode {
-        match panic::catch_unwind(|| open_session(h, CG_MOUNT)) {
-            Ok(Ok(())) => PamResultCode::PAM_SUCCESS,
-            _ => PamResultCode::PAM_SESSION_ERR,
-        }
+#[no_mangle]
+pub extern "C" fn pam_sm_open_session(
+    h: &mut PamHandle,
+    _flags: c_int,
+    _argc: c_int,
+    _argv: *const *const c_char,
+) -> c_int {
+    match panic::catch_unwind(|| open_session(h, CG_MOUNT)) {
+        Ok(Ok(())) => 0,
+        _ => 14,
     }
 }
+
+#[no_mangle]
+pub extern "C" fn pam_sm_close_session(
+    _h: &mut PamHandle,
+    _flags: c_int,
+    _argc: c_int,
+    _argv: *const *const c_char,
+) -> c_int {
+    0
+}
-- 
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