build: initial skeleton

Add initial build system integration.

crates/nss/src/helpers.rs

@@ -0,0 +1,8 @@
+// SPDX-FileCopyrightText: Matteo Settenvini <matteo.settenvini@montecristosoftware.eu>
+// SPDX-License-Identifier: EUPL-1.2
+
+pub fn set_if_valid<T>(ptr: *mut T, val: T) {
+    if !ptr.is_null() {
+        unsafe { *ptr = val };
+    }
+}

crates/nss/src/lib.rs

@@ -0,0 +1,133 @@
+// SPDX-FileCopyrightText: 2022 Matteo Settenvini <matteo.settenvini@montecristosoftware.eu>
+// SPDX-License-Identifier: EUPL-1.2
+
+mod helpers;
+mod nss_bindings;
+
+use {
+    crate::helpers::set_if_valid,
+    crate::nss_bindings::{HErrno, gaih_addrtuple, nss_status},
+    libc::{AF_INET, hostent, size_t, socklen_t},
+    nix::errno::Errno,
+    std::os::raw::{c_char, c_int, c_void},
+    std::ptr,
+};
+
+// -------------- by host ---------------
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _nss_parental_ctrls_gethostbyname4_r(
+    _name: *const c_char,
+    _pat: *mut *mut gaih_addrtuple,
+    _buffer: *mut c_char,
+    _buflen: size_t,
+    _errnop: *mut Errno,
+    _h_errnop: *mut HErrno,
+    _ttlp: *mut i32,
+) -> nss_status {
+    todo!()
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _nss_parental_ctrls_gethostbyname3_r(
+    _name: *const c_char,
+    _af: c_int,
+    _host: *mut hostent,
+    _buffer: *mut c_char,
+    _buflen: size_t,
+    _errnop: *mut Errno,
+    _h_errnop: *mut HErrno,
+    _ttlp: *mut i32,
+    _canonp: *mut *mut char,
+) -> nss_status {
+    todo!()
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _nss_parental_ctrls_gethostbyname2_r(
+    name: *const c_char,
+    af: c_int,
+    host: *mut hostent,
+    buffer: *mut c_char,
+    buflen: size_t,
+    errnop: *mut Errno,
+    h_errnop: *mut HErrno,
+) -> nss_status {
+    _nss_parental_ctrls_gethostbyname3_r(
+        name,
+        af,
+        host,
+        buffer,
+        buflen,
+        errnop,
+        h_errnop,
+        ptr::null_mut(),
+        ptr::null_mut(),
+    )
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _nss_parental_ctrls_gethostbyname_r(
+    name: *const c_char,
+    host: *mut hostent,
+    buffer: *mut c_char,
+    buflen: size_t,
+    errnop: *mut Errno,
+    h_errnop: *mut HErrno,
+) -> nss_status {
+    _nss_parental_ctrls_gethostbyname3_r(
+        name,
+        AF_INET,
+        host,
+        buffer,
+        buflen,
+        errnop,
+        h_errnop,
+        ptr::null_mut(),
+        ptr::null_mut(),
+    )
+}
+
+// ----------------- by addr -----------------
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _nss_parental_ctrls_gethostbyaddr2_r(
+    _addr: *const c_void,
+    _len: socklen_t,
+    _af: c_int,
+    _host: *mut hostent,
+    _buffer: *mut c_char,
+    _buflen: size_t,
+    errnop: *mut Errno,
+    h_errnop: *mut HErrno,
+    _ttlp: *mut i32,
+) -> nss_status {
+    set_if_valid(errnop, Errno::from_raw(0));
+    set_if_valid(h_errnop, HErrno::Success);
+
+    todo!()
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _nss_parental_ctrls_gethostbyaddr_r(
+    addr: *const c_void,
+    len: socklen_t,
+    af: c_int,
+    host: *mut hostent,
+    buffer: *mut c_char,
+    buflen: size_t,
+    errnop: *mut Errno,
+    h_errnop: *mut HErrno,
+) -> nss_status {
+    _nss_parental_ctrls_gethostbyaddr2_r(
+        addr,
+        len,
+        af,
+        host,
+        buffer,
+        buflen,
+        errnop,
+        h_errnop,
+        ptr::null_mut(),
+    )
+}

crates/nss/src/nss_bindings.rs

@@ -0,0 +1,7 @@
+// SPDX-FileCopyrightText: Matteo Settenvini <matteo.settenvini@montecristosoftware.eu>
+// SPDX-License-Identifier: EUPL-1.2
+
+#![allow(dead_code)]
+#![allow(non_camel_case_types)]
+#![allow(non_upper_case_globals)]
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));