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annotate libpam-sys/libpam-sys-consts/build.rs @ 159:634cd5f2ac8b

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Separate logging into its own trait apart from the rest of PAM.
author Paul Fisher <paul@pfish.zone>
date Sat, 12 Jul 2025 18:16:18 -0400
parents d5b7b28d754e
children 09dff285ff5e
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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 /// Automatically detect PAM, using the installed implementation if present
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12 /// or the OS default if not.
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13 Auto,
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14 /// Use the default PAM implementation based on the OS.
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15 TargetDefault,
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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 TARGET_DEFAULT: &str = "__TARGET_DEFAULT__";
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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 None | Some("") => match option_env!("DOCS_RS") {
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25 // docs.rs cross-compiles, so we don't want to look at
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26 // its currently-installed PAM; instead we want to use the OS.
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27 Some(_) => Detect::TargetDefault,
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28 // In other cases, just auto-detect the actual installed library.
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29 None => Detect::Auto,
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30 },
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31 Some(TARGET_DEFAULT) => Detect::TargetDefault,
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32 Some(val) => Detect::Specified(PamImpl::try_from(val).unwrap_or_else(|_| {
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33 panic!(
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34 "unknown PAM implementation {val:?}. \
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35 valid LIBPAMSYS_IMPLs are {:?}, \
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36 {TARGET_DEFAULT:?} to use the OS default, \
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37 or unset to detect",
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38 PamImpl::items()
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39 )
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40 })),
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41 };
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42 let pam_impl = match detection {
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43 Detect::Auto => LibPam::probe_detect(),
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44 Detect::TargetDefault => LibPam::os_default(),
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45 Detect::Specified(other) => other,
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46 };
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47 let impl_str = format!("{pam_impl:?}");
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48 println!("{}", generate_cfg(&impl_str));
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49 // We set this environment variable to substitute into docstrings.
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50 println!("cargo:rustc-env=LIBPAMSYS_IMPL={impl_str}");
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51 fs::write(
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52 format!("{}/pam_impl_const.rs", env::var("OUT_DIR").unwrap()),
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53 generate_consts(&impl_str),
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54 )
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55 .unwrap();
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56 }
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57
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58 fn generate_consts(impl_str: &str) -> String {
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59 format!(
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60 "\
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61 impl PamImpl {{
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62 /// The implementation of libpam this was built for (`{impl_str}`).
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63 pub const CURRENT: Self = Self::{impl_str};
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64 }}
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65
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66 /// String name of [`PamImpl::CURRENT`], for substituting into docs.
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67 #[macro_export]
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68 macro_rules! pam_impl_name {{ () => ({impl_str:?}) }}
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69 "
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70 )
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71 }
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72
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73 struct LibPam(NonNull<c_void>);
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74
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75 impl LibPam {
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76 /// Look at the currently-installed LibPAM, or use [`Self::os_default`]
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77 /// if absent.
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78 fn probe_detect() -> PamImpl {
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79 if let Some(lib) = Self::open() {
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80 if lib.has("pam_syslog") {
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81 return PamImpl::LinuxPam;
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82 } else if lib.has("_openpam_log") {
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83 return PamImpl::OpenPam;
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84 } else if lib.has("__pam_get_authtok") {
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85 return PamImpl::Sun;
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86 }
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87 }
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88 Self::os_default()
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89 }
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90
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91 /// Guess the PAM implementation based on the current OS.
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92 fn os_default() -> PamImpl {
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93 if cfg!(target_os = "linux") {
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94 PamImpl::LinuxPam
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95 } else if cfg!(any(
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96 target_os = "macos",
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97 target_os = "freebsd",
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98 target_os = "netbsd",
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99 target_os = "dragonfly",
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100 target_os = "openbsd",
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101 )) {
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102 PamImpl::OpenPam
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103 } else if cfg!(any(target_os = "illumos", target_os = "solaris")) {
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104 PamImpl::Sun
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105 } else {
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106 PamImpl::XSso
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107 }
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108 }
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109
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110 fn open() -> Option<Self> {
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111 let dlopen = |s: &[u8]| unsafe { libc::dlopen(s.as_ptr().cast(), libc::RTLD_LAZY) };
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112 NonNull::new(dlopen(b"libpam.so\0"))
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113 .or_else(|| NonNull::new(dlopen(b"libpam.dylib\0")))
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114 .map(Self)
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115 }
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116
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117 fn has(&self, name: &str) -> bool {
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118 let name = CString::new(name).unwrap();
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119 let symbol = unsafe { libc::dlsym(self.0.as_ptr(), name.as_ptr()) };
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120 !symbol.is_null()
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121 }
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122 }
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123
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124 impl Drop for LibPam {
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125 fn drop(&mut self) {
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126 unsafe {
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127 libc::dlclose(self.0.as_ptr());
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128 }
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129 }
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130 }