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annotate src/libpam/environ.rs @ 99:8840fa6534f6

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Streamline dependencies and rename to openpam-extensions.
author Paul Fisher <paul@pfish.zone>
date Tue, 24 Jun 2025 14:54:47 -0400
parents b87100c5eed4
children 3f11b8d30f63
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rev   line source
98
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1 #![allow(unused_variables)] // for now
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2 use crate::environ::EnvironMapMut;
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3 use crate::libpam::memory::CHeapString;
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4 use crate::{EnvironMap, LibPamHandle};
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5 use std::ffi::{c_char, OsStr, OsString};
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6 use std::os::unix::ffi::OsStrExt;
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7 use std::ptr::NonNull;
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8 use std::{iter, ptr};
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9 use crate::libpam::memory;
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10
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11 pub struct LibPamEnviron<'a> {
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12 source: &'a LibPamHandle,
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13 }
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14
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15 pub struct LibPamEnvironMut<'a> {
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16 source: &'a mut LibPamHandle,
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17 }
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18
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19 impl<'a> LibPamEnviron<'a> {
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20 pub fn new(source: &'a LibPamHandle) -> Self {
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21 Self { source }
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22 }
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23 }
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24
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25 impl<'a> LibPamEnvironMut<'a> {
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26 pub fn new(source: &'a mut LibPamHandle) -> Self {
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27 Self { source }
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28 }
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29
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30 fn immut(&self) -> LibPamEnviron {
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31 LibPamEnviron {
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32 source: self.source,
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33 }
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34 }
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35 }
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36
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37 impl EnvironMap for LibPamEnviron<'_> {
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38 fn get(&self, val: &OsStr) -> Option<&OsStr> {
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39 todo!()
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40 }
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41
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42 fn iter(&self) -> impl Iterator<Item = (&OsStr, &OsStr)> {
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43 iter::from_fn(|| todo!())
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44 }
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45 }
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46
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47 impl EnvironMap for LibPamEnvironMut<'_> {
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48 fn get(&self, val: &OsStr) -> Option<&OsStr> {
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49 todo!()
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50 }
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51
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52 fn iter(&self) -> impl Iterator<Item = (&OsStr, &OsStr)> {
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53 iter::from_fn(|| todo!())
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54 }
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55 }
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56
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57 impl EnvironMapMut for LibPamEnvironMut<'_> {
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58 fn insert(&mut self, key: &OsStr, val: &OsStr) -> Option<OsString> {
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59 todo!()
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60 }
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61
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62 fn remove(&mut self, key: &OsStr) -> Option<OsString> {
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63 todo!()
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64 }
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65 }
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66
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67 struct EnvList {
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68 /// Pointer to the start of the environment variable list.
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69 ///
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70 /// This can't be a `CHeapBox` because it's not just a single
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71 /// `Option<EnvVar>`.
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72 vars: NonNull<Option<EnvVar>>,
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73 }
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74
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75 impl EnvList {
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76 unsafe fn from_ptr(ptr: NonNull<*mut c_char>) -> Self {
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77 Self{vars: ptr.cast()}
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78 }
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79
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80 fn iter(&self) -> impl Iterator<Item = (&OsStr, &OsStr)> {
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81 let mut current = self.vars;
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82 iter::from_fn(move || {
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83 match unsafe {current.as_ref()} {
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84 None => None,
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85 Some(item) => {
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86 let ret = item.as_kv();
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87 current = unsafe {current.add(1) };
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88 Some(ret)
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89 }
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90 }
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91 })
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92 }
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93 }
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94
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95 impl Drop for EnvList {
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96 fn drop(&mut self) {
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97 // SAFETY: We own this pointer, and we know it's valid environment data
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98 // from PAM.
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99 unsafe {
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100 let mut var = self.vars;
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101 while let Some(var_ref) = var.as_mut() {
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102 ptr::drop_in_place(var_ref as *mut EnvVar);
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103 var = var.add(1);
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104 }
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105 memory::free(self.vars.as_ptr())
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106 }
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107 }
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108 }
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109
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110 struct EnvVar(CHeapString);
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111
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112 impl EnvVar {
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113 fn as_kv(&self) -> (&OsStr, &OsStr) {
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114 let bytes = self.0.to_bytes();
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115 let mut split = bytes.splitn(2, |&b| b == b'=');
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116 (
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117 OsStr::from_bytes(split.next().unwrap_or_default()),
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118 OsStr::from_bytes(split.next().unwrap_or_default()),
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119 )
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120 }
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121 }
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122
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123 #[cfg(test)]
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124 mod tests {
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125 use crate::libpam::memory::CHeapBox;
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126 use super::*;
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127
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128 #[test]
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129 fn test_split_kv() {
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130 fn test(input: &str, key: &str, value: &str) {
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131 let data = CHeapString::new(input).unwrap();
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132 let key = OsStr::from_bytes(key.as_bytes());
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133 let value = OsStr::from_bytes(value.as_bytes());
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134
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135 assert_eq!(EnvVar(data).as_kv(), (key, value));
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136 }
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137 test("THIS=that", "THIS", "that");
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138 test("THESE=those, no one=knows", "THESE", "those, no one=knows");
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139 test("HERE=", "HERE", "");
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140 test("SOME", "SOME", "");
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141 test("", "", "");
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142 }
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143
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144 #[test]
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145 fn test_iter() {
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146 let bx = CHeapBox::new([
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147 Some("ONE=two"),
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148 Some("BIRDS=birds=birds"),
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149 Some("me"),
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150 Some("you="),
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151 None,
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152 ].map(|txt| txt.map(|txt| CHeapString::new(txt).unwrap()))).unwrap();
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153 let env_ptr = CHeapBox::into_ptr(bx);
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154
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155 let envs = unsafe {EnvList::from_ptr(env_ptr.cast())};
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156 let bytes = |data: &'static str| OsStr::from_bytes(data.as_ref());
b87100c5eed4 Start on environment variables, and make pointers nicer.
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157 let result: Vec<_> = envs.iter().collect();
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158 assert_eq!(vec![
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159 (bytes("ONE"), bytes("two")),
b87100c5eed4 Start on environment variables, and make pointers nicer.
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160 (bytes("BIRDS"), bytes("birds=birds")),
b87100c5eed4 Start on environment variables, and make pointers nicer.
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161 (bytes("me"), bytes("")),
b87100c5eed4 Start on environment variables, and make pointers nicer.
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162 (bytes("you"), bytes("")),
b87100c5eed4 Start on environment variables, and make pointers nicer.
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163 ],
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164 result);
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165 }
b87100c5eed4 Start on environment variables, and make pointers nicer.
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166 }