Ensure loading of NSS module in tests

.gitignore

@@ -4,3 +4,4 @@
 /build
 /target
 /Cargo.lock
+/.gdb_history

CMakeLists.txt

@@ -18,5 +18,9 @@ FetchContent_Declare(
 FetchContent_MakeAvailable(Corrosion)
 corrosion_import_crate(MANIFEST_PATH Cargo.toml)
 
-get_target_property(corrosion_install_libraries nss_malcontent INTERFACE_LINK_LIBRARIES)
-install(IMPORTED_RUNTIME_ARTIFACTS ${corrosion_install_libraries})
+set(sonamever 2) # mandated by NSS 3
+get_property(corrosion_install_libraries TARGET nss_malcontent PROPERTY INTERFACE_LINK_LIBRARIES)
+string(TOUPPER ${CMAKE_BUILD_TYPE} config_type_upper)
+get_property(location TARGET ${corrosion_install_libraries} PROPERTY "IMPORTED_LOCATION_${config_type_upper}")
+cmake_path(GET location FILENAME lib_basename)
+install(FILES ${location} TYPE LIB RENAME "${lib_basename}.${sonamever}")

Cargo.toml

@@ -28,5 +28,5 @@ version = "1.0"
 version = "0.2"
 
 [dependencies.nix]
-version = "0.24"
+version = "0.25"
 features = []

build.rs

@@ -6,10 +6,16 @@ extern crate bindgen;
 use {std::env, std::path::PathBuf};
 
 fn main() {
+    let out_dir = std::env::var("OUT_DIR").unwrap();
+
     println!("cargo:rerun-if-changed=wrapper.h");
 
     // Required by NSS 2
-    println!("cargo:rustc-link-arg=-Wl,-soname,libnss_malcontent.so.2");
+    println!("cargo:rustc-cdylib-link-arg=-Wl,-soname,libnss_malcontent.so.2");
+
+    // Enable dynamic loading of NSS module from OUT_DIR
+    // (see https://doc.rust-lang.org/cargo/reference/environment-variables.html#dynamic-library-paths)
+    println!("cargo:rustc-link-search={}", &out_dir);
 
     let bindings = bindgen::Builder::default()
         .header("wrapper.h")

deny.toml

@@ -206,8 +206,8 @@ allow-git = []
 
 [sources.allow-org]
 # 1 or more github.com organizations to allow git sources for
-github = [""]
+# github = [""]
 # 1 or more gitlab.com organizations to allow git sources for
-gitlab = [""]
+# gitlab = [""]
 # 1 or more bitbucket.org organizations to allow git sources for
-bitbucket = [""]
+# bitbucket = [""]

src/nss_api.rs

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: 2022 Matteo Settenvini <matteo.settenvini@montecristosoftware.eu>
 // SPDX-License-Identifier: GPL-3.0-or-later
 
+#![allow(dead_code)]
 include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
 
 use {
@@ -13,28 +14,28 @@ use {
 
 #[no_mangle]
 pub extern "C" fn _nss_malcontent_gethostbyname4_r(
-    name: *const c_char,
-    pat: *mut *mut gaih_addrtuple,
-    buffer: *mut c_char,
-    buflen: size_t,
-    errnop: *mut c_int,
-    h_errnop: *mut c_int,
-    ttlp: *mut i32,
+    _name: *const c_char,
+    _pat: *mut *mut gaih_addrtuple,
+    _buffer: *mut c_char,
+    _buflen: size_t,
+    _errnop: *mut c_int,
+    _h_errnop: *mut c_int,
+    _ttlp: *mut i32,
 ) -> nss_status {
     todo!()
 }
 
 #[no_mangle]
 pub extern "C" fn _nss_malcontent_gethostbyname3_r(
-    name: *const c_char,
-    af: c_int,
-    host: *mut hostent,
-    buffer: *mut c_char,
-    buflen: size_t,
-    errnop: *mut c_int,
-    h_errnop: *mut c_int,
-    ttlp: *mut i32,
-    canonp: *mut *mut char,
+    _name: *const c_char,
+    _af: c_int,
+    _host: *mut hostent,
+    _buffer: *mut c_char,
+    _buflen: size_t,
+    _errnop: *mut c_int,
+    _h_errnop: *mut c_int,
+    _ttlp: *mut i32,
+    _canonp: *mut *mut char,
 ) -> nss_status {
     todo!()
 }
@@ -88,15 +89,15 @@ pub extern "C" fn _nss_malcontent_gethostbyname_r(
 
 #[no_mangle]
 pub extern "C" fn _nss_malcontent_gethostbyaddr2_r(
-    addr: *const c_void,
-    len: socklen_t,
-    af: c_int,
-    host: *mut hostent,
-    buffer: *mut c_char,
-    buflen: size_t,
-    errnop: *mut c_int,
-    h_errnop: *mut c_int,
-    ttlp: *mut i32,
+    _addr: *const c_void,
+    _len: socklen_t,
+    _af: c_int,
+    _host: *mut hostent,
+    _buffer: *mut c_char,
+    _buflen: size_t,
+    _errnop: *mut c_int,
+    _h_errnop: *mut c_int,
+    _ttlp: *mut i32,
 ) -> nss_status {
     todo!()
 }

tests/common.rs

@@ -1,11 +1,15 @@
 // SPDX-FileCopyrightText: 2022 Matteo Settenvini <matteo.settenvini@montecristosoftware.eu>
 // SPDX-License-Identifier: GPL-3.0-or-later
 
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+#![allow(dead_code)]
+
 use {
     anyhow::{ensure, Result},
+    std::env,
     std::ffi::CString,
-    std::os::raw::c_int,
-    std::os::unix::fs::symlink,
     std::path::PathBuf,
     std::sync::Once,
 };
@@ -15,33 +19,27 @@ include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
 static SETUP: Once = Once::new();
 
 pub fn setup() -> Result<()> {
-    unsafe {
-        static mut NSS_CONFIG_STATUS: c_int = 0;
+    let out_dir = PathBuf::from(env!("OUT_DIR"));
+    let nss_config_status = unsafe {
         SETUP.call_once(|| {
-            let out_dir = PathBuf::from(env!("OUT_DIR"));
             let library_path = test_cdylib::build_current_project();
             let mut library_filename = library_path.file_name().unwrap().to_owned();
-            library_filename.push(".2"); // required for NSS 2 modules
+            library_filename.push(".2"); // required for NSS modules
 
             let dest = out_dir.join(library_filename);
-            symlink(&library_path, &dest).expect(&format!(
-                "Unable to create symlink to library ({} -> {})",
-                library_path.to_string_lossy(),
-                dest.to_string_lossy()
-            ));
-
-            std::env::set_var("LD_LIBRARY_PATH", out_dir);
-
-            let db = CString::new("hosts").unwrap();
-            let resolvers = CString::new("files malcontent [UNAVAIL=return] dns").unwrap();
-            NSS_CONFIG_STATUS = __nss_configure_lookup(db.as_ptr(), resolvers.as_ptr());
+            std::fs::copy(library_path, dest).unwrap();
         });
 
-        ensure!(
-            NSS_CONFIG_STATUS == 0,
-            "Unable to configure NSS to load module: __nss_configure_lookup() returned {}",
-            NSS_CONFIG_STATUS
-        );
-        Ok(())
-    }
+        let db = CString::new("hosts").unwrap();
+        let resolvers = CString::new("malcontent [UNAVAIL=return] dns").unwrap();
+        __nss_configure_lookup(db.as_ptr(), resolvers.as_ptr())
+    };
+
+    ensure!(
+        nss_config_status == 0,
+        "Unable to configure NSS to load module: __nss_configure_lookup() returned {}",
+        nss_config_status
+    );
+
+    Ok(())
 }

tests/integration_test.rs

@@ -3,13 +3,33 @@
 
 mod common;
 
-use anyhow::Result;
+use {
+    anyhow::{bail, Result},
+    libc::{freeaddrinfo, gai_strerror, getaddrinfo},
+};
 
 #[test]
-fn nss_module_is_loaded() -> Result<()> {
-    use std::net::ToSocketAddrs;
+#[should_panic(expected = "not yet implemented")]
+fn nss_module_is_loaded() {
+    common::setup().unwrap();
 
-    common::setup()?;
-    "www.google.com:443".to_socket_addrs()?;
-    Ok(())
+    let hostname = std::ffi::CString::new("gnome.org").unwrap();
+    unsafe {
+        let mut addr = std::ptr::null_mut();
+        match getaddrinfo(
+            hostname.as_ptr(),
+            std::ptr::null(),
+            std::ptr::null(),
+            &mut addr,
+        ) {
+            0 => freeaddrinfo(addr),
+            status => {
+                let error = std::ffi::CStr::from_ptr(gai_strerror(status));
+                panic!(
+                    "Unable to resolve hostname, getaddrinfo returned {}",
+                    error.to_str().unwrap()
+                )
+            }
+        }
+    };
 }