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comparison build.rs @ 80:5aa1a010f1e8

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Start using PAM headers; improve owned/borrowed distinction. - Uses bindgen to generate bindings (only if needed). - Gets the story together on owned vs. borrowed handles. - Reduces number of mutable borrows in handle operation (since `PamHandle` is neither `Send` nor `Sync`, we never have to worry about thread safety. - Improves a bunch of macros so we don't have our own special syntax for docs. - Implement question indirection for standard XSSO PAM implementations.
author Paul Fisher <paul@pfish.zone>
date Tue, 10 Jun 2025 01:09:30 -0400
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children a8f4718fed5d
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79:2128123b9406 80:5aa1a010f1e8
1 use bindgen::MacroTypeVariation;
2 use std::env;
3 use std::path::PathBuf;
4
5 fn main() {
6 if cfg!(feature = "link") {
7 println!("cargo::rustc-check-cfg=cfg(pam_impl, values(\"linux-pam\",\"openpam\"))");
8 let common_builder = bindgen::Builder::default()
9 .merge_extern_blocks(true)
10 .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
11 .blocklist_type("pam_handle")
12 .blocklist_type("pam_conv")
13 .allowlist_var(".*")
14 .allowlist_function("pam_start")
15 .allowlist_function("pam_[gs]et_item")
16 .allowlist_function("pam_get_user")
17 .allowlist_function("pam_get_authtok")
18 .allowlist_function("pam_end")
19 .dynamic_link_require_all(true)
20 .default_macro_constant_type(MacroTypeVariation::Signed);
21
22 let linux_builder = common_builder.clone().header_contents(
23 "linux-pam.h",
24 r#"
25 #include <security/_pam_types.h>
26 #include <security/pam_appl.h>
27 #include <security/pam_ext.h>
28 #include <security/pam_modules.h>
29 "#,
30 );
31 let openpam_builder = common_builder.clone().header_contents(
32 "openpam.h",
33 r#"
34 #include <security/openpam.h>
35 #include <security/pam_appl.h>
36 #include <security/pam_constants.h>
37 #include <security/pam_types.h>
38 "#,
39 );
40
41 let (pam_impl, bindings) = {
42 let bb = linux_builder.generate();
43 bb.as_ref().unwrap();
44 if let Ok(bindings) = bb {
45 ("linux-pam", bindings)
46 } else if let Ok(bindings) = openpam_builder.generate() {
47 ("openpam", bindings)
48 } else {
49 panic!("unrecognized PAM implementation")
50 }
51 };
52 println!("cargo::rustc-cfg=pam_impl={pam_impl:?}");
53 let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
54 bindings
55 .write_to_file(out_path.join("bindings.rs"))
56 .unwrap();
57 }
58 }