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annotate libpam-sys/build.rs @ 106:49d9e2b5c189

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An irresponsible mix of implementing libpam-sys and other stuff.
author Paul Fisher <paul@pfish.zone>
date Thu, 26 Jun 2025 22:41:28 -0400
parents
children e97534be35e3
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106
49d9e2b5c189 An irresponsible mix of implementing libpam-sys and other stuff.
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1 use bindgen::MacroTypeVariation;
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2 use std::error::Error;
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3 use std::fmt::{Debug, Display, Formatter};
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4 use std::path::PathBuf;
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5 use std::{env, fs};
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6
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7 enum PamImpl {
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8 Illumos,
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9 LinuxPam,
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10 OpenPam,
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11 }
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12
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13 #[derive(Debug)]
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14 struct InvalidEnum(String);
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15
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16 impl Display for InvalidEnum {
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17 fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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18 write!(f, "invalid PAM impl {:?}", self.0)
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19 }
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20 }
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21
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22 impl Error for InvalidEnum {}
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23
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24 impl TryFrom<&str> for PamImpl {
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25 type Error = InvalidEnum;
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26 fn try_from(value: &str) -> Result<Self, Self::Error> {
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27 Ok(match value {
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28 "illumos" => Self::Illumos,
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29 "linux-pam" => Self::LinuxPam,
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30 "openpam" => Self::OpenPam,
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31 other => return Err(InvalidEnum(other.to_owned())),
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32 })
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33 }
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34 }
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35
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36 impl Debug for PamImpl {
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37 fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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38 Debug::fmt(
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39 match self {
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40 Self::Illumos => "illumos",
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41 Self::LinuxPam => "linux-pam",
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42 Self::OpenPam => "openpam",
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43 },
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44 f,
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45 )
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46 }
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47 }
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48
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49 fn main() {
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50 println!("cargo:rustc-link-lib=pam");
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51 let out_file = PathBuf::from(env::var("OUT_DIR").unwrap()).join("constants.rs");
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52 let pam_impl = do_detection();
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53
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54 if cfg!(feature = "use-system-headers") {
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55 let builder = bindgen::Builder::default()
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56 .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
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57 .blocklist_function(".*")
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58 .blocklist_type(".*")
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59 .allowlist_var(".*")
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60 .default_macro_constant_type(MacroTypeVariation::Unsigned);
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61
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62 let builder = match pam_impl {
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63 PamImpl::Illumos => builder.header_contents(
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64 "illumos.h",
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65 "\
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66 #include <security/pam_appl.h>
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67 #include <security/pam_modules.h>
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68 ",
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69 ),
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70 PamImpl::LinuxPam => builder.header_contents(
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71 "linux-pam.h",
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72 "\
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73 #include <security/_pam_types.h>
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74 #include <security/pam_appl.h>
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75 #include <security/pam_ext.h>
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76 #include <security/pam_modules.h>
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77 ",
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78 ),
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79 PamImpl::OpenPam => builder.header_contents(
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80 "openpam.h",
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81 "\
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82 #include <security/pam_types.h>
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83 #include <security/openpam.h>
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84 #include <security/pam_appl.h>
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85 #include <security/pam_constants.h>
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86 ",
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87 ),
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88 };
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89 let bindings = builder.generate().unwrap();
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90 bindings.write_to_file(out_file).unwrap();
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91 } else {
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92 // Just write empty data to the file to avoid conditional compilation
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93 // shenanigans.
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94 fs::write(out_file, "").unwrap();
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95 }
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96 }
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97
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98 fn do_detection() -> PamImpl {
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99 println!(r#"cargo:rustc-check-cfg=cfg(pam_impl, values("illumos", "linux-pam", "openpam"))"#);
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100 let pam_impl = _detect_internal();
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101 println!("cargo:rustc-cfg=pam_impl={pam_impl:?}");
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102 pam_impl
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103 }
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104
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105 fn _detect_internal() -> PamImpl {
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106 if let Some(pam_impl) = option_env!("LIBPAMSYS_PAM_IMPL") {
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107 pam_impl.try_into().unwrap()
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108 } else if cfg!(feature = "use-system-headers") {
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109 // Detect which impl it is from system headers.
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110 if header_exists("security/_pam_types.h") {
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111 PamImpl::LinuxPam
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112 } else if header_exists("security/openpam.h") {
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113 PamImpl::OpenPam
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114 } else if header_exists("security/pam_appl.h") {
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115 PamImpl::Illumos
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116 } else {
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117 panic!("could not detect PAM implementation")
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118 }
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119 } else {
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120 // Otherwise, guess what PAM impl we're using based on the OS.
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121 if cfg!(target_os = "linux") {
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122 PamImpl::LinuxPam
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123 } else if cfg!(any(
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124 target_os = "macos",
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125 target_os = "freebsd",
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126 target_os = "netbsd",
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127 target_os = "dragonfly",
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128 target_os = "openbsd"
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129 )) {
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130 PamImpl::OpenPam
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131 } else {
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132 PamImpl::Illumos
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133 }
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134 }
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135 }
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136
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137 fn header_exists(header: &str) -> bool {
49d9e2b5c189 An irresponsible mix of implementing libpam-sys and other stuff.
Paul Fisher <paul@pfish.zone>
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138 bindgen::Builder::default()
49d9e2b5c189 An irresponsible mix of implementing libpam-sys and other stuff.
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139 .blocklist_item(".*")
49d9e2b5c189 An irresponsible mix of implementing libpam-sys and other stuff.
Paul Fisher <paul@pfish.zone>
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140 .header_contents("header.h", &format!("#include <{header}>"))
49d9e2b5c189 An irresponsible mix of implementing libpam-sys and other stuff.
Paul Fisher <paul@pfish.zone>
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141 .generate()
49d9e2b5c189 An irresponsible mix of implementing libpam-sys and other stuff.
Paul Fisher <paul@pfish.zone>
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142 .is_ok()
49d9e2b5c189 An irresponsible mix of implementing libpam-sys and other stuff.
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143 }