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annotate libpam-sys/libpam-sys-impls/src/lib.rs @ 109:bb465393621f

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Minor cleanup and reorg. - Use those nice new macros we just implemented. - Straighten out the macro file. - Move the `BinaryPayload` into `structs.rs`, leaving helpers behind.
author Paul Fisher <paul@pfish.zone>
date Sat, 28 Jun 2025 02:49:35 -0400
parents e97534be35e3
children 2346fd501b7a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
108
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1 use proc_macro as pm;
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2 use proc_macro2::{Delimiter, Group, Literal, Span, TokenStream, TokenTree};
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3 use quote::{format_ident, quote};
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4 use std::fmt::Display;
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5 use syn::Lit;
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6
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7 /// A `cfg`-like attribute macro for code specific to one PAM implementation.
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8 ///
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9 /// Different versions of PAM export different functions and have some
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10 /// meaningful internal implementation differences, like the way `pam_conv`
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11 /// is handled (see [the Linux-PAM man page for details][man7]).
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12 ///
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13 /// ```
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14 /// # use libpam_sys_impls::cfg_pam_impl;
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15 /// #[cfg_pam_impl("Illumos")]
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16 /// fn do_something() { /* illumos-only code */ }
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17 ///
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18 /// #[cfg_pam_impl(not("Illumos"))]
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19 /// fn do_something() { /* non-illumos code */ }
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20 ///
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21 /// #[cfg_pam_impl(any("LinuxPam", "MinimalOpenPam"))]
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22 /// fn do_something_else() { /* Linux-PAM or minimal OpenPAM */ }
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23 ///
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24 /// #[cfg_pam_impl(not(any("Illumos", "OpenPam")))]
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25 /// fn do_a_third_thing() { /* Neither Illumos nor OpenPAM */ }
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26 ///
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27 /// #[cfg_pam_impl(any())]
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28 /// fn this_will_never_build() { /* why would you do this? */ }
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29 ///
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30 /// #[cfg_pam_impl(not(any()))]
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31 /// fn this_will_always_build() { /* this is technically legal */ }
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32 /// ```
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33 ///
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34 /// [man7]: https://man7.org/linux/man-pages/man3/pam_conv.3.html
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35 #[proc_macro_attribute]
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36 pub fn cfg_pam_impl(attr: pm::TokenStream, item: pm::TokenStream) -> pm::TokenStream {
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37 Predicate::parse(attr.into(), None)
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38 .map(|p| {
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39 if p.matches(pam_impl_str()) {
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40 item
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41 } else {
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42 pm::TokenStream::new()
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43 }
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44 })
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45 .unwrap_or_else(|e| syn::Error::from(e).into_compile_error().into())
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46 }
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47
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48 /// Outputs the `PamImpl` enum and `LIBPAMSYS_IMPL` constant. Private.
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49 #[proc_macro]
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50 pub fn pam_impl_enum(data: pm::TokenStream) -> pm::TokenStream {
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51 if !data.is_empty() {
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52 panic!("unexpected stuff in pam_impl_enum!()")
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53 }
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54
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55 let variant = format_ident!("{}", pam_impl_str());
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56
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57 quote!(
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58 /// The PAM implementations supported by `libpam-sys`.
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59 #[non_exhaustive]
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60 #[derive(Clone, Copy, Debug, PartialEq)]
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61 pub enum PamImpl {
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62 /// [Linux-PAM] is provided by most Linux implementations.
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63 ///
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64 /// [Linux-PAM]: https://github.com/linux-pam/linux-pam
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65 LinuxPam,
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66 /// [OpenPAM] is used by most BSD distributions, including Mac OS X.
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67 ///
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68 /// [OpenPAM]: https://git.des.dev/OpenPAM/OpenPAM
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69 OpenPam,
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70 /// [Illumos PAM] is used on Illumos and Solaris systems.
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71 ///
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72 /// [Illumos PAM]: https://code.illumos.org/plugins/gitiles/illumos-gate/+/refs/heads/master/usr/src/lib/libpam
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73 Illumos,
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74 /// Only the functionality in [the PAM spec],
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75 /// with OpenPAM/Illumos constants.
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76 ///
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77 /// [the PAM spec]: https://pubs.opengroup.org/onlinepubs/8329799/toc.htm
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78 MinimalOpenPam,
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79 }
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80
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81 #[doc = concat!("This version of libpam-sys was built for **", stringify!(#variant), "**.")]
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82 pub const LIBPAMSYS_IMPL: PamImpl = PamImpl::#variant;
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83 )
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84 .into()
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85 }
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86
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87 /// The name of the PAM implementation. Used only in `libpam-sys`. Private.
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88 #[proc_macro]
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89 pub fn pam_impl_name(data: pm::TokenStream) -> pm::TokenStream {
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90 if !data.is_empty() {
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91 panic!("pam_impl_name! does not take any input")
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92 }
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93 pm::TokenTree::Literal(pm::Literal::string(pam_impl_str())).into()
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94 }
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95
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96 fn pam_impl_str() -> &'static str {
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97 env!("LIBPAMSYS_IMPL")
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98 }
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99
108
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100 #[derive(Debug)]
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101 enum Error {
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102 WithSpan(syn::Error),
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103 WithoutSpan(String),
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104 }
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105
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106 impl Error {
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107 fn new<D: Display>(span: Option<Span>, msg: D) -> Self {
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108 match span {
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109 Some(span) => syn::Error::new(span, msg).into(),
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110 None => Self::WithoutSpan(msg.to_string()),
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111 }
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112 }
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113 }
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114
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115 impl From<syn::Error> for Error {
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116 fn from(value: syn::Error) -> Self {
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117 Self::WithSpan(value)
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118 }
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119 }
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120
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121 impl From<String> for Error {
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122 fn from(value: String) -> Self {
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123 Self::WithoutSpan(value)
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124 }
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125 }
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126
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127 impl From<Error> for syn::Error {
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128 fn from(value: Error) -> Self {
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129 match value {
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130 Error::WithSpan(e) => e,
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131 Error::WithoutSpan(s) => syn::Error::new(Span::call_site(), s),
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132 }
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133 }
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134 }
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135
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136 type Result<T> = std::result::Result<T, Error>;
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137
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138 #[derive(Debug)]
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139 enum Predicate {
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140 Literal(String),
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141 Any(Vec<String>),
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142 Not(Box<Predicate>),
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143 }
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144
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145 impl Predicate {
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146 fn matches(&self, value: &str) -> bool {
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diff changeset
147 match self {
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148 Self::Literal(literal) => value == literal,
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149 Self::Not(pred) => !pred.matches(value),
109
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150 Self::Any(options) => options.iter().any(|s| s == value),
108
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151 }
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152 }
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153
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154 fn parse(stream: TokenStream, span: Option<Span>) -> Result<Self> {
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155 let mut iter = stream.into_iter();
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156 let pred = match iter.next() {
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157 None => return error(span, "a PAM implementation predicate must be provided"),
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158 Some(TokenTree::Literal(lit)) => Self::Literal(Self::string_lit(lit)?),
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159 Some(TokenTree::Ident(id)) => {
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Paul Fisher <paul@pfish.zone>
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160 let next = Self::parens(iter.next(), span)?;
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parents:
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161 match id.to_string().as_str() {
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Paul Fisher <paul@pfish.zone>
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162 "not" => Self::Not(Box::new(Self::parse(next.stream(), Some(next.span()))?)),
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163 "any" => Self::Any(Self::parse_any(next)?),
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164 _ => return unexpected(&id.into(), "\"not\" or \"any\""),
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165 }
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166 }
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167 Some(other) => return unexpected(&other, "\"not\", \"any\", or a string literal"),
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168 };
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169 // Check for anything after. We only allow a comma and nothing else.
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170 if maybe_comma(iter.next())? {
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171 if let Some(next) = iter.next() {
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172 return unexpected(&next, "nothing");
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173 }
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174 }
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175 Ok(pred)
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176 }
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177
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178 fn parens(tree: Option<TokenTree>, mut span: Option<Span>) -> Result<Group> {
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179 if let Some(tree) = tree {
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180 span = Some(tree.span());
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181 if let TokenTree::Group(g) = tree {
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182 if g.delimiter() == Delimiter::Parenthesis {
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183 return Ok(g);
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184 }
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185 }
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186 }
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187 Err(Error::new(span, "expected function-call syntax"))
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188 }
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189
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190 fn parse_any(g: Group) -> Result<Vec<String>> {
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191 let mut output = Vec::new();
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192 let mut iter = g.stream().into_iter();
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193 loop {
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194 match iter.next() {
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195 None => break,
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196 Some(TokenTree::Literal(lit)) => {
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197 output.push(Self::string_lit(lit)?);
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198 if !maybe_comma(iter.next())? {
109
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199 break;
108
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200 }
109
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201 }
108
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202 Some(other) => return unexpected(&other, "string literal"),
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203 }
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204 }
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205 Ok(output)
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206 }
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207
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208 fn string_lit(lit: Literal) -> Result<String> {
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209 let tree: TokenTree = lit.clone().into();
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210 match syn::parse2::<Lit>(tree.into())? {
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211 Lit::Str(s) => Ok(s.value()),
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212 _ => unexpected(&lit.into(), "string literal"),
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213 }
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214 }
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215 }
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216
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217 fn error<T, M: Display>(span: Option<Span>, message: M) -> Result<T> {
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218 Err(Error::new(span, message))
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219 }
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220
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221 fn unexpected<T>(tree: &TokenTree, want: &str) -> Result<T> {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
222 error(
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223 Some(tree.span()),
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224 format!("expected {want}; got unexpected token {tree}"),
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225 )
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parents:
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226 }
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227
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228 fn maybe_comma(next: Option<TokenTree>) -> Result<bool> {
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parents:
diff changeset
229 match next {
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parents:
diff changeset
230 None => Ok(false),
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Paul Fisher <paul@pfish.zone>
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diff changeset
231 Some(tree) => {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
232 if let TokenTree::Punct(p) = &tree {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
233 if p.as_char() == ',' {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
234 return Ok(true);
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Paul Fisher <paul@pfish.zone>
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235 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
236 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
237 unexpected(&tree, "',' or ')'")
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
238 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
239 }
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Paul Fisher <paul@pfish.zone>
parents:
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240 }
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Paul Fisher <paul@pfish.zone>
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241
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Paul Fisher <paul@pfish.zone>
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242 #[cfg(test)]
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Paul Fisher <paul@pfish.zone>
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diff changeset
243 mod tests {
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Paul Fisher <paul@pfish.zone>
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244 use super::*;
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245
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Paul Fisher <paul@pfish.zone>
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246 fn parse(tree: TokenStream) -> Predicate {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
247 Predicate::parse(tree, None).unwrap()
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248 }
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249
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
250 #[test]
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Paul Fisher <paul@pfish.zone>
parents:
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251 fn test_parse() {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
252 macro_rules! cases {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
253 ($(($($i:tt)*)),* $(,)?) => { [ $( quote!($($i)*) ),* ] };
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parents:
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254 }
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Paul Fisher <paul@pfish.zone>
parents:
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255
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
256 let good = cases![
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
257 ("this"),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
258 (any("this", "that", "the other")),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
259 (not("the bees")),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
260 (not(any("of", "those"))),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
261 (not(not("saying it"))),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
262 (any("trailing", "comma", "allowed",)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
263 ("even on a singleton",),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
264 (not("forbidden here either",)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
265 (not(not(any("this", "is", "stupid"),),),),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
266 ];
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
267 for tree in good {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
268 parse(tree);
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
269 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
270 let bad = cases![
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
271 (),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
272 (wrong),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
273 (wheel::of::fortune),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
274 ("invalid", "syntax"),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
275 (any(any)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
276 (any),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
277 (not),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
278 (not(any)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
279 ("too many commas",,),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
280 (any("too", "many",, "commas")),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
281 (not("the commas",,,)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
282 (9),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
283 (any("123", 8)),
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Paul Fisher <paul@pfish.zone>
parents:
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284 (not(666)),
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285 ];
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286 for tree in bad {
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287 Predicate::parse(tree, None).unwrap_err();
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288 }
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289 }
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290
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291 #[test]
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292 fn test_match() {
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293 macro_rules! cases {
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294 ($(($e:expr, ($($i:tt)*))),* $(,)?) => {
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295 [$(($e, quote!($($i)*))),*]
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296 }
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297 }
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298 let matching = cases![
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299 ("Illumos", (any("Illumos", "OpenPam"))),
109
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300 ("OpenPam", (any("Illumos", "OpenPam"))),
108
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301 ("LinuxPam", (not("OpenPam"))),
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302 ("MinimalOpenPam", (not("OpenPam"))),
108
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303 ("Other", (not(any("This", "That")))),
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304 ("OpenPam", (not(not("OpenPam")))),
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305 ("Anything", (not(any()))),
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306 ];
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307 for (good, tree) in matching {
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308 let pred = parse(tree);
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309 assert!(pred.matches(good))
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310 }
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311
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312 let nonmatching = cases![
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313 ("LinuxPam", (not("LinuxPam"))),
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314 ("Illumos", ("LinuxPam")),
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315 ("OpenPam", (any("LinuxPam", "Illumos"))),
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316 ("One", (not(any("One", "Another")))),
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317 ("Negatory", (not(not("Affirmative")))),
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318 ];
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319 for (bad, tree) in nonmatching {
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320 let pred = parse(tree);
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321 assert!(!pred.matches(bad))
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322 }
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323 }
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324 }