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annotate libpam-sys/libpam-sys-consts/build.rs @ 167:0cabe7b94a4f

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author Paul Fisher <paul@pfish.zone>
date Tue, 15 Jul 2025 00:39:08 -0400
parents 09dff285ff5e
children 46e8ce5cd5d1
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1 #![allow(unexpected_cfgs)]
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2
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3 use std::ffi::{c_void, CString};
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4 use std::ptr::NonNull;
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5 use std::{env, fs};
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6
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7 include!("src/pam_impl.rs");
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8
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9 /// The strategy to use to detect PAM.
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10 enum Detect {
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11 /// Use the default PAM implementation based on the OS,
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12 /// or the currently-installed version if the OS is not recognized.
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13 TargetDefault,
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14 /// Detect the installed implementation.
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15 Installed,
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16 /// Use the named version of PAM.
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17 Specified(PamImpl),
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18 }
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19
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20 const INSTALLED: &str = "__installed__";
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21
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22 fn main() {
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23 let detection = match option_env!("LIBPAMSYS_IMPL") {
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24 Some("") | None => Detect::TargetDefault,
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25 Some(INSTALLED) => Detect::Installed,
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26 Some(val) => Detect::Specified(PamImpl::try_from(val).unwrap_or_else(|_| {
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27 panic!(
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28 "unknown PAM implementation {val:?}. \
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29 valid LIBPAMSYS_IMPLs are {:?}, \
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30 {INSTALLED:?} to use the OS default, \
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31 or unset to detect",
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32 PamImpl::items()
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33 )
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34 })),
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35 };
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36 let pam_impl = match detection {
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37 Detect::TargetDefault => LibPam::target_default(),
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38 Detect::Installed => LibPam::probe_detect(),
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39 Detect::Specified(other) => other,
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40 };
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41 let impl_str = format!("{pam_impl:?}");
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42 println!("{}", generate_cfg(&impl_str));
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43 // We set this environment variable to substitute into docstrings.
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44 println!("cargo:rustc-env=LIBPAMSYS_IMPL={impl_str}");
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45 fs::write(
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46 format!("{}/pam_impl_const.rs", env::var("OUT_DIR").unwrap()),
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47 generate_consts(&impl_str),
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48 )
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49 .unwrap();
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50 }
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51
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52 fn generate_consts(impl_str: &str) -> String {
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53 format!(
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54 "\
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55 impl PamImpl {{
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56 /// The implementation of libpam this was built for (`{impl_str}`).
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57 pub const CURRENT: Self = Self::{impl_str};
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58 }}
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59
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60 /// String name of [`PamImpl::CURRENT`], for substituting into docs.
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61 #[macro_export]
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62 macro_rules! pam_impl_name {{ () => ({impl_str:?}) }}
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63 "
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64 )
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65 }
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66
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67 struct LibPam(NonNull<c_void>);
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68
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69 impl LibPam {
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70 /// Guess the PAM implementation based on the current OS.
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71 fn target_default() -> PamImpl {
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72 if cfg!(target_os = "linux") {
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73 PamImpl::LinuxPam
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74 } else if cfg!(any(
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75 target_os = "macos",
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76 target_os = "freebsd",
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77 target_os = "netbsd",
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78 target_os = "dragonfly",
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79 target_os = "openbsd",
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80 )) {
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81 PamImpl::OpenPam
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82 } else if cfg!(any(target_os = "illumos", target_os = "solaris")) {
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83 PamImpl::Sun
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84 } else {
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85 Self::probe_detect()
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86 }
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87 }
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88
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89 /// Look at the currently-installed LibPAM.
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90 fn probe_detect() -> PamImpl {
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91 if let Some(lib) = Self::open() {
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92 if lib.has("pam_syslog") {
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93 return PamImpl::LinuxPam;
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94 } else if lib.has("_openpam_log") {
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95 return PamImpl::OpenPam;
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96 } else if lib.has("__pam_get_authtok") {
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97 return PamImpl::Sun;
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98 }
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99 }
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100 // idk
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101 PamImpl::XSso
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102 }
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103
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104 fn open() -> Option<Self> {
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105 let dlopen = |s: &[u8]| unsafe { libc::dlopen(s.as_ptr().cast(), libc::RTLD_LAZY) };
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106 NonNull::new(dlopen(b"libpam.so\0"))
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107 .or_else(|| NonNull::new(dlopen(b"libpam.dylib\0")))
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108 .map(Self)
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109 }
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110
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111 fn has(&self, name: &str) -> bool {
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112 let name = CString::new(name).unwrap();
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113 let symbol = unsafe { libc::dlsym(self.0.as_ptr(), name.as_ptr()) };
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114 !symbol.is_null()
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115 }
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116 }
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117
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118 impl Drop for LibPam {
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119 fn drop(&mut self) {
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120 unsafe {
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121 libc::dlclose(self.0.as_ptr());
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122 }
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123 }
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124 }