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annotate libpam-sys/libpam-sys-impls/build.rs @ 128:ad77f2af5ff4 default tip

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Fix `rustc-check-cfg` in `libpam-sys/build.rs`.
author Paul Fisher <paul@pfish.zone>
date Mon, 30 Jun 2025 23:00:53 -0400
parents c77846f3a979
children
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1 //! This absurd build script basically sets up everything for libpam-sys-impl.
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2 //!
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3 //! 1. It's the definition site for the [`PamImpl`] enum, which then gets
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4 //! output to the `OUT_DIR/pam_impl_enum.rs` file for parsing/inclusion
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5 //! into the `__pam_impl_enum__` macro.
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6 //! 2. It detects the current PAM implementation and sets an env var for
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7 //! the macros in `libpam-sys-impl`.
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8 //!
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9 //! We need to have this detection here for `#[cfg_pam_impl]` to work properly
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10 //! when exported to downstream crates.
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11
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12 use dlopen::raw::Library;
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13 use proc_macro2::TokenStream;
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14 use quote::quote;
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15 use std::ffi::c_void;
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16 use std::{env, fs};
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17 use strum::{EnumIter, EnumString, IntoEnumIterator};
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18
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19 const DETECT: &str = "__detect__";
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20
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21 fn main() {
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22 let pam_impl = match option_env!("LIBPAMSYS_IMPL") {
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23 // The default option: Guess what PAM impl we're using based on OS.
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24 None => {
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25 if cfg!(target_os = "linux") {
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26 PamImpl::LinuxPam
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27 } else if cfg!(any(
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28 target_os = "macos",
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29 target_os = "freebsd",
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30 target_os = "netbsd",
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31 target_os = "dragonfly",
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32 target_os = "openbsd"
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33 )) {
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34 PamImpl::OpenPam
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35 } else if cfg!(any(target_os = "illumos", target_os = "solaris",)) {
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36 PamImpl::Sun
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37 } else {
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38 PamImpl::XSso
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39 }
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40 }
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41 Some(DETECT) => {
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42 // Detect the library based on the symbols in libpam.so.
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43 let lib = Library::open("libpam.so").unwrap();
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44 if symbol_exists(&lib, "pam_syslog") {
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45 PamImpl::LinuxPam
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46 } else if symbol_exists(&lib, "_openpam_log") {
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47 PamImpl::OpenPam
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48 } else if symbol_exists(&lib, "__pam_get_authtok") {
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49 PamImpl::Sun
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50 } else {
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51 // If all else fails, assume the bare minimum.
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52 PamImpl::XSso
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53 }
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54 }
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55 Some(other) => match PamImpl::try_from(other) {
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56 Ok(i) => i,
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57 Err(_) => {
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58 let valid: Vec<_> = PamImpl::iter().collect();
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59 panic!(
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60 "unknown PAM implementation {other:?}. valid LIBPAMSYS_IMPLs are {valid:?}, or use {DETECT:?}"
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61 )
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62 }
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63 },
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64 };
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65 fs::write(
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66 format!("{}/pam_impl_enum.rs", env::var("OUT_DIR").unwrap()),
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67 PamImpl::enum_tokens().to_string(),
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68 )
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69 .unwrap();
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70 println!("cargo:rustc-env=LIBPAMSYS_IMPL={pam_impl:?}");
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71 }
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72
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73 fn symbol_exists(lib: &Library, symbol: &str) -> bool {
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74 unsafe { lib.symbol::<*mut c_void>(symbol) }.is_ok()
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75 }
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76
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77 /// This defines a local enum with an `enum_tokens()` method that can spit out
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78 /// its own contents.
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79 macro_rules! self_aware_enum {
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80 (
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81 $(#here[$here:meta])*
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82 $(#[$attr:meta])*
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83 $name:ident {
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84 $($tt:tt)*
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85 }
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86 ) => {
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87 $(#[$here])*
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88 $(#[$attr])*
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89 pub enum $name {
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90 $($tt)*
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91 }
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92
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93 impl $name {
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94 fn enum_tokens() -> TokenStream {
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95 quote!(
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96 $(#[$attr])*
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97 pub enum $name {
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98 $($tt)*
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99 }
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100 )
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101 }
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102 }
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103 }
108
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104 }
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105
110
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106 self_aware_enum!(
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107 #here[derive(EnumString, strum::Display, EnumIter)]
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108 /// The PAM implementations supported by `libpam-sys`.
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109 #[derive(Clone, Copy, Debug, PartialEq)]
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110 PamImpl {
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111 /// [Linux-PAM] is provided by most Linux distributions.
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112 ///
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113 /// [Linux-PAM]: https://github.com/linux-pam/linux-pam
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114 LinuxPam,
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115 /// [OpenPAM] is used by most BSDs, including Mac OS X.
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116 ///
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117 /// [OpenPAM]: https://git.des.dev/OpenPAM/OpenPAM
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118 OpenPam,
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119 /// Illumos and Solaris use a derivative of [Sun's implementation][sun].
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120 ///
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121 /// [sun]: https://code.illumos.org/plugins/gitiles/illumos-gate/+/refs/heads/master/usr/src/lib/libpam
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122 Sun,
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123 /// Only the functionality and constants in [the PAM spec].
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124 ///
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125 /// [the PAM spec]: https://pubs.opengroup.org/onlinepubs/8329799/toc.htm
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126 XSso,
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127 }
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128 );