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annotate libpam-sys/libpam-sys-impls/src/lib.rs @ 110:2346fd501b7a

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Add tests for constants and do other macro niceties. - Adds tests for all the constants. Pretty sweet. - Moves documentation for cfg-pam-impl macro to `libpam-sys`. - Renames `Illumos` to `Sun`. - other stuff
author Paul Fisher <paul@pfish.zone>
date Sun, 29 Jun 2025 02:15:46 -0400
parents bb465393621f
children 178310336596
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 std::str::FromStr;
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6 use syn::Lit;
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7
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8 // For documentation on this, see the `libpam-sys` crate.
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9 #[proc_macro_attribute]
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10 pub fn cfg_pam_impl(attr: pm::TokenStream, item: pm::TokenStream) -> pm::TokenStream {
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11 Predicate::parse(attr.into(), None)
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12 .map(|p| {
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13 if p.matches(pam_impl_str()) {
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14 item
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15 } else {
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16 pm::TokenStream::new()
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17 }
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18 })
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19 .unwrap_or_else(|e| syn::Error::from(e).into_compile_error().into())
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20 }
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21
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22 /// Outputs the `PamImpl` enum and `LIBPAMSYS_IMPL` constant.
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23 /// For use only in `libpam-sys`.
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24 ///
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25 /// The tokens passed into the macro are pasted immediately before the enum.
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26 #[proc_macro]
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27 pub fn __pam_impl_enum__(data: pm::TokenStream) -> pm::TokenStream {
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28 let variant = format_ident!("{}", pam_impl_str());
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29 TokenStream::from_iter([
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30 data.into(),
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31 TokenStream::from_str(include_str!(concat!(env!("OUT_DIR"), "/pam_impl_enum.rs"))).unwrap(),
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32 quote!(
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33 impl PamImpl {
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34 #[doc = concat!("The PAM implementation this was built for (currently `", stringify!(#variant), ")`.")]
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35 pub const CURRENT: Self = Self::#variant;
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36 }
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37 ),
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38 ]).into()
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39 }
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40
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41 /// The name of the PAM implementation. For use only in `libpam-sys`.
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42 #[proc_macro]
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43 pub fn __pam_impl_name__(data: pm::TokenStream) -> pm::TokenStream {
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44 if !data.is_empty() {
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45 panic!("pam_impl_name! does not take any input")
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46 }
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47 pm::TokenTree::Literal(pm::Literal::string(pam_impl_str())).into()
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48 }
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49
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50 fn pam_impl_str() -> &'static str {
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51 env!("LIBPAMSYS_IMPL")
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52 }
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53
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54 #[derive(Debug)]
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55 enum Error {
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56 WithSpan(syn::Error),
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57 WithoutSpan(String),
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58 }
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59
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60 impl Error {
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61 fn new<D: Display>(span: Option<Span>, msg: D) -> Self {
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62 match span {
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63 Some(span) => syn::Error::new(span, msg).into(),
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64 None => Self::WithoutSpan(msg.to_string()),
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65 }
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66 }
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67 }
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68
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69 impl From<syn::Error> for Error {
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70 fn from(value: syn::Error) -> Self {
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71 Self::WithSpan(value)
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72 }
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73 }
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74
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75 impl From<String> for Error {
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76 fn from(value: String) -> Self {
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77 Self::WithoutSpan(value)
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78 }
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79 }
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80
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81 impl From<Error> for syn::Error {
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82 fn from(value: Error) -> Self {
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83 match value {
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84 Error::WithSpan(e) => e,
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85 Error::WithoutSpan(s) => syn::Error::new(Span::call_site(), s),
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86 }
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87 }
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88 }
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89
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90 type Result<T> = std::result::Result<T, Error>;
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91
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92 #[derive(Debug)]
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93 enum Predicate {
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94 Literal(String),
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95 Any(Vec<String>),
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96 Not(Box<Predicate>),
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97 }
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98
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99 impl Predicate {
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100 fn matches(&self, value: &str) -> bool {
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101 match self {
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102 Self::Literal(literal) => value == literal,
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103 Self::Not(pred) => !pred.matches(value),
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104 Self::Any(options) => options.iter().any(|s| s == value),
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105 }
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106 }
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107
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108 fn parse(stream: TokenStream, span: Option<Span>) -> Result<Self> {
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109 let mut iter = stream.into_iter();
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110 let pred = match iter.next() {
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111 None => return error(span, "a PAM implementation predicate must be provided"),
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112 Some(TokenTree::Literal(lit)) => Self::Literal(Self::string_lit(lit)?),
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113 Some(TokenTree::Ident(id)) => {
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114 let next = Self::parens(iter.next(), span)?;
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115 match id.to_string().as_str() {
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116 "not" => Self::Not(Box::new(Self::parse(next.stream(), Some(next.span()))?)),
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117 "any" => Self::Any(Self::parse_any(next)?),
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118 _ => return unexpected(&id.into(), "\"not\" or \"any\""),
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119 }
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120 }
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121 Some(other) => return unexpected(&other, "\"not\", \"any\", or a string literal"),
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122 };
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123 // Check for anything after. We only allow a comma and nothing else.
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124 if maybe_comma(iter.next())? {
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125 if let Some(next) = iter.next() {
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126 return unexpected(&next, "nothing");
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127 }
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128 }
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129 Ok(pred)
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130 }
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131
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132 fn parens(tree: Option<TokenTree>, mut span: Option<Span>) -> Result<Group> {
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133 if let Some(tree) = tree {
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134 span = Some(tree.span());
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135 if let TokenTree::Group(g) = tree {
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136 if g.delimiter() == Delimiter::Parenthesis {
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137 return Ok(g);
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138 }
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parents:
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139 }
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Paul Fisher <paul@pfish.zone>
parents:
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140 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
141 Err(Error::new(span, "expected function-call syntax"))
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parents:
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142 }
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parents:
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143
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Paul Fisher <paul@pfish.zone>
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144 fn parse_any(g: Group) -> Result<Vec<String>> {
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parents:
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145 let mut output = Vec::new();
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
146 let mut iter = g.stream().into_iter();
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
147 loop {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
148 match iter.next() {
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Paul Fisher <paul@pfish.zone>
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diff changeset
149 None => break,
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Paul Fisher <paul@pfish.zone>
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150 Some(TokenTree::Literal(lit)) => {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
151 output.push(Self::string_lit(lit)?);
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
152 if !maybe_comma(iter.next())? {
109
bb465393621f Minor cleanup and reorg.
Paul Fisher <paul@pfish.zone>
parents: 108
diff changeset
153 break;
108
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parents:
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154 }
109
bb465393621f Minor cleanup and reorg.
Paul Fisher <paul@pfish.zone>
parents: 108
diff changeset
155 }
108
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156 Some(other) => return unexpected(&other, "string literal"),
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parents:
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157 }
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Paul Fisher <paul@pfish.zone>
parents:
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158 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
159 Ok(output)
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Paul Fisher <paul@pfish.zone>
parents:
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160 }
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Paul Fisher <paul@pfish.zone>
parents:
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161
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Paul Fisher <paul@pfish.zone>
parents:
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162 fn string_lit(lit: Literal) -> Result<String> {
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Paul Fisher <paul@pfish.zone>
parents:
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163 let tree: TokenTree = lit.clone().into();
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
164 match syn::parse2::<Lit>(tree.into())? {
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Paul Fisher <paul@pfish.zone>
parents:
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165 Lit::Str(s) => Ok(s.value()),
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Paul Fisher <paul@pfish.zone>
parents:
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166 _ => unexpected(&lit.into(), "string literal"),
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Paul Fisher <paul@pfish.zone>
parents:
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167 }
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Paul Fisher <paul@pfish.zone>
parents:
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168 }
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Paul Fisher <paul@pfish.zone>
parents:
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169 }
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parents:
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170
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Paul Fisher <paul@pfish.zone>
parents:
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171 fn error<T, M: Display>(span: Option<Span>, message: M) -> Result<T> {
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parents:
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172 Err(Error::new(span, message))
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Paul Fisher <paul@pfish.zone>
parents:
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173 }
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Paul Fisher <paul@pfish.zone>
parents:
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174
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Paul Fisher <paul@pfish.zone>
parents:
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175 fn unexpected<T>(tree: &TokenTree, want: &str) -> Result<T> {
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Paul Fisher <paul@pfish.zone>
parents:
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176 error(
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Paul Fisher <paul@pfish.zone>
parents:
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177 Some(tree.span()),
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Paul Fisher <paul@pfish.zone>
parents:
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178 format!("expected {want}; got unexpected token {tree}"),
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Paul Fisher <paul@pfish.zone>
parents:
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179 )
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Paul Fisher <paul@pfish.zone>
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180 }
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181
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Paul Fisher <paul@pfish.zone>
parents:
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182 fn maybe_comma(next: Option<TokenTree>) -> Result<bool> {
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parents:
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183 match next {
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Paul Fisher <paul@pfish.zone>
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184 None => Ok(false),
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185 Some(tree) => {
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Paul Fisher <paul@pfish.zone>
parents:
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186 if let TokenTree::Punct(p) = &tree {
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parents:
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187 if p.as_char() == ',' {
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Paul Fisher <paul@pfish.zone>
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188 return Ok(true);
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189 }
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parents:
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190 }
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Paul Fisher <paul@pfish.zone>
parents:
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191 unexpected(&tree, "',' or ')'")
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parents:
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192 }
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parents:
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193 }
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parents:
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194 }
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195
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196 #[cfg(test)]
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197 mod tests {
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198 use super::*;
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199
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200 fn parse(tree: TokenStream) -> Predicate {
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Paul Fisher <paul@pfish.zone>
parents:
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201 Predicate::parse(tree, None).unwrap()
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parents:
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202 }
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Paul Fisher <paul@pfish.zone>
parents:
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203
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Paul Fisher <paul@pfish.zone>
parents:
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204 #[test]
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parents:
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205 fn test_parse() {
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Paul Fisher <paul@pfish.zone>
parents:
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206 macro_rules! cases {
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207 ($(($($i:tt)*)),* $(,)?) => { [ $( quote!($($i)*) ),* ] };
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208 }
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209
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Paul Fisher <paul@pfish.zone>
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210 let good = cases![
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211 ("this"),
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Paul Fisher <paul@pfish.zone>
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212 (any("this", "that", "the other")),
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Paul Fisher <paul@pfish.zone>
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213 (not("the bees")),
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Paul Fisher <paul@pfish.zone>
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214 (not(any("of", "those"))),
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Paul Fisher <paul@pfish.zone>
parents:
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215 (not(not("saying it"))),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
216 (any("trailing", "comma", "allowed",)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
217 ("even on a singleton",),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
218 (not("forbidden here either",)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
219 (not(not(any("this", "is", "stupid"),),),),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
220 ];
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
221 for tree in good {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
222 parse(tree);
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
223 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
224 let bad = cases![
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
225 (),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
226 (wrong),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
227 (wheel::of::fortune),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
228 ("invalid", "syntax"),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
229 (any(any)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
230 (any),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
231 (not),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
232 (not(any)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
233 ("too many commas",,),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
234 (any("too", "many",, "commas")),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
235 (not("the commas",,,)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
236 (9),
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
237 (any("123", 8)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
238 (not(666)),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
239 ];
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
240 for tree in bad {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
241 Predicate::parse(tree, None).unwrap_err();
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
242 }
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
243 }
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
244
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
245 #[test]
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
246 fn test_match() {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
247 macro_rules! cases {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
248 ($(($e:expr, ($($i:tt)*))),* $(,)?) => {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
249 [$(($e, quote!($($i)*))),*]
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
250 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
251 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
252 let matching = cases![
110
2346fd501b7a Add tests for constants and do other macro niceties.
Paul Fisher <paul@pfish.zone>
parents: 109
diff changeset
253 ("Sun", (any("Sun", "OpenPam"))),
2346fd501b7a Add tests for constants and do other macro niceties.
Paul Fisher <paul@pfish.zone>
parents: 109
diff changeset
254 ("OpenPam", (any("Sun", "OpenPam"))),
108
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
255 ("LinuxPam", (not("OpenPam"))),
109
bb465393621f Minor cleanup and reorg.
Paul Fisher <paul@pfish.zone>
parents: 108
diff changeset
256 ("MinimalOpenPam", (not("OpenPam"))),
108
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
257 ("Other", (not(any("This", "That")))),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
258 ("OpenPam", (not(not("OpenPam")))),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
259 ("Anything", (not(any()))),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
260 ];
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
261 for (good, tree) in matching {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
262 let pred = parse(tree);
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
263 assert!(pred.matches(good))
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
264 }
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
265
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
266 let nonmatching = cases![
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
267 ("LinuxPam", (not("LinuxPam"))),
110
2346fd501b7a Add tests for constants and do other macro niceties.
Paul Fisher <paul@pfish.zone>
parents: 109
diff changeset
268 ("Sun", ("LinuxPam")),
2346fd501b7a Add tests for constants and do other macro niceties.
Paul Fisher <paul@pfish.zone>
parents: 109
diff changeset
269 ("OpenPam", (any("LinuxPam", "Sun"))),
108
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
270 ("One", (not(any("One", "Another")))),
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
271 ("Negatory", (not(not("Affirmative")))),
110
2346fd501b7a Add tests for constants and do other macro niceties.
Paul Fisher <paul@pfish.zone>
parents: 109
diff changeset
272 ("MinimalOpenPam", ("OpenPam")),
2346fd501b7a Add tests for constants and do other macro niceties.
Paul Fisher <paul@pfish.zone>
parents: 109
diff changeset
273 ("OpenPam", (("MinimalOpenPam"))),
108
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
274 ];
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
275 for (bad, tree) in nonmatching {
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
276 let pred = parse(tree);
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
277 assert!(!pred.matches(bad))
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
278 }
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Paul Fisher <paul@pfish.zone>
parents:
diff changeset
279 }
e97534be35e3 Make some proc macros for doing cfg-like stuff for PAM impls.
Paul Fisher <paul@pfish.zone>
parents:
diff changeset
280 }