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annotate libpam-sys/src/lib.rs @ 174:9e4ce1631bd3

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Dramatically expand documentation.
author Paul Fisher <paul@pfish.zone>
date Tue, 29 Jul 2025 18:58:27 -0400
parents a75a66cb4181
children 0730f5f2ee2a
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1 //! `libpam-sys` provides low-level access to LibPAM.
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2 //!
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3 //! Everything in here is directly as exported from the LibPAM library or
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4 //! its header files, with two exceptions:
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5 //!
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6 //! - The [`pam_impl`] submodule (and the associated [`pam_impl_name!`] macro),
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7 //! which can be used to detect the current PAM implementation.
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8 //! - The [`aliases`] submodule, which contains convenient aliases
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9 //! for callback types used in libpam, so you don't have to type
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10 //! `unsafe extern "C" fn(this is so long)` all the time.
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11 #![doc = concat!("This documentation was built for the **", pam_impl_name!(), "** implementation.")]
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12 //!
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13 //! You can override this **at build time** by setting the `LIBPAMSYS_IMPL`
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14 //! environment variable to one of the values of the [`pam_impl::PamImpl`] enum.
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15 //! For more information about configuration, see the documentation of
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16 //! [`libpam-sys-consts`](https://crates.io/crates/libpam-sys-consts).
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17 #![allow(non_camel_case_types)]
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18 #![allow(unused_imports)]
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19
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20 pub mod aliases;
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21 #[doc(inline)]
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22 pub use libpam_sys_consts::constants::*;
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23 #[doc(inline)]
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24 pub use libpam_sys_consts::{pam_impl, pam_impl_name};
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25 use std::ffi::{c_char, c_int, c_uint, c_void};
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26 use std::fmt;
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27 use std::marker::{PhantomData, PhantomPinned};
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28
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29 /// An opaque structure that PAM uses to communicate.
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30 ///
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31 /// This is only ever returned in pointer form and cannot be constructed.
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32 #[repr(C)]
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33 pub struct pam_handle {
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34 _value: (),
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35 _marker: PhantomData<(PhantomPinned, *mut c_void)>,
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36 }
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37
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38 impl fmt::Debug for pam_handle {
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39 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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40 write!(f, "pam_handle({self:p}")
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41 }
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42 }
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43
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44 /// Used by PAM to communicate between the module and the application.
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45 #[repr(C)]
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46 #[derive(Debug)]
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47 pub struct pam_conv {
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48 pub conv: unsafe extern "C" fn(
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49 num_msg: c_int,
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50 msg: *const *const pam_message,
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51 resp: *mut *mut pam_response,
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52 appdata: *mut c_void,
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53 ) -> c_int,
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54 pub appdata_ptr: *mut c_void,
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55 }
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56
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57 /// A message sent into a PAM conversation.
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58 #[repr(C)]
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59 #[derive(Debug)]
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60 pub struct pam_message {
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61 pub msg_style: c_int,
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62 pub msg: *const c_char,
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63 }
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64
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65 /// A response returned from a PAM conversation.
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66 #[repr(C)]
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67 #[derive(Debug)]
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68 pub struct pam_response {
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69 pub resp: *mut c_char,
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70 /// Completely unused.
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71 pub resp_retcode: c_int,
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72 }
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73
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74 /// Definition of the PAM_XAUTHDATA item. Compatible with `xcb_auth_info_t`.
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75 #[cfg(pam_impl = "LinuxPam")]
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76 #[repr(C)]
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77 pub struct pam_xauth_data {
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78 pub namelen: c_int,
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79 pub name: *mut c_char,
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80 pub datalen: c_int,
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81 pub data: *mut c_char,
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82 }
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83
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84 #[cfg(pam_impl = "LinuxPam")]
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85 #[derive(Debug)]
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86 #[repr(C)]
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87 pub struct pam_modutil_privs {
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88 pub grplist: *mut libc::gid_t,
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89 pub number_of_groups: c_int,
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90 pub allocated: c_int,
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91 pub old_gid: libc::gid_t,
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92 pub old_uid: libc::uid_t,
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93 pub is_dropped: c_int,
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94 }
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95
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96 #[cfg(pam_impl = "OpenPam")]
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97 pub type pam_func_t = unsafe extern "C" fn(
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98 handle: *mut pam_handle,
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99 flags: c_int,
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100 argc: c_int,
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101 argv: *const *const c_char,
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102 ) -> c_int;
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103
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104 #[cfg(pam_impl = "OpenPam")]
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105 #[derive(Debug)]
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106 #[repr(C)]
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107 pub struct pam_module {
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108 pub path: *mut c_char,
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109 pub func: [pam_func_t; 6],
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110 pub dlh: *mut c_void,
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111 }
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112
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113 #[cfg(any(pam_impl = "OpenPam", pam_impl = "Sun"))]
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114 #[derive(Debug)]
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115 #[repr(C)]
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116 pub struct pam_repository {
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117 pub type_: *mut c_char,
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118 pub scope: *mut c_void,
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119 pub scope_len: usize,
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120 }
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121
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122 // These are the functions specified in X/SSO. Everybody exports them.
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123 extern "C" {
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124 /// Account validation.
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125 pub fn pam_acct_mgmt(pamh: *mut pam_handle, flags: c_int) -> c_int;
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126
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127 /// Authenticate a user.
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128 pub fn pam_authenticate(pamh: *mut pam_handle, flags: c_int) -> c_int;
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129
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130 // Nobody implements pam_authenticate_secondary.
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131
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132 /// Manage authentication tokens.
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133 pub fn pam_chauthtok(pamh: *mut pam_handle, flags: c_int) -> c_int;
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134
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135 /// Close an opened user session.
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136 pub fn pam_close_session(pamh: *mut pam_handle, flags: c_int) -> c_int;
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137
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138 /// Ends the PAM transaction.
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139 pub fn pam_end(pamh: *mut pam_handle, flags: c_int) -> c_int;
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140
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141 /// Gets module-specific data. PAM still owns the data.
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142 pub fn pam_get_data(
153
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143 pamh: *const pam_handle,
127
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144 module_data_name: *const c_char,
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145 data: *mut *const c_void,
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146 ) -> c_int;
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147
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148 /// Gets an environment variable. You own the return value.
130
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149 pub fn pam_getenv(pamh: *const pam_handle, name: *const c_char) -> *mut c_char;
127
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150
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151 /// Gets all the environment variables. You own everything it points to.
130
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152 pub fn pam_getenvlist(pamh: *const pam_handle) -> *mut *mut c_char;
127
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153
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154 /// Get information about the transaction.
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155 ///
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156 /// The item is owned by PAM.
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157 pub fn pam_get_item(
130
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158 pamh: *const pam_handle,
127
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159 item_type: c_int,
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160 item: *mut *const c_void,
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161 ) -> c_int;
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162
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163 // Nobody implements pam_get_mapped_authtok.
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164 // Nobody implements pam_get_mapped_username.
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165
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166 /// Get the username. PAM owns it.
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167 pub fn pam_get_user(
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168 pamh: *mut pam_handle,
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169 user: *mut *const c_char,
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170 prompt: *const c_char,
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171 ) -> c_int;
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172
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173 /// Opens a user session.
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174 pub fn pam_open_session(pamh: *mut pam_handle, flags: c_int) -> c_int;
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175
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176 /// Sets the value of an environment variable. `namevalue` is copied.
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177 pub fn pam_putenv(pamh: *mut pam_handle, namevalue: *const c_char) -> c_int;
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178
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179 /// Update or delete user credentials.
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180 pub fn pam_setcred(pamh: *mut pam_handle, flags: c_int) -> c_int;
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181
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182 /// Set module-specific data. PAM will call `cleanup` when completed.
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183 pub fn pam_set_data(
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184 pamh: *mut pam_handle,
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185 module_data_name: *const c_char,
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186 data: *mut c_void,
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187 cleanup: unsafe extern "C" fn(
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188 pamh: *mut pam_handle,
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189 data: *mut c_void,
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190 pam_end_status: c_int,
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191 ),
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192 ) -> c_int;
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193
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194 /// Set information about the transaction. The `item` is copied.
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195 pub fn pam_set_item(pamh: *mut pam_handle, item_type: c_int, item: *const c_void) -> c_int;
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196
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197 // Nobody implements pam_set_mapped_authtok.
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198 // Nobody implements pam_set_mapped_username.
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199
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200 // The pam_sm_whatever functions are prototypes for the functions that
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201 // a PAM module should implement, not symbols provided by PAM.
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202
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203 /// Starts a PAM transaction. The `conv` may or may not be copied.
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204 pub fn pam_start(
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205 service: *const c_char,
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206 user: *const c_char,
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207 pam_conv: *mut pam_conv,
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208 pamh: *mut *mut pam_handle,
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209 ) -> c_int;
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210
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211 /// Gets a statically-allocated error string.
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212 ///
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213 /// All implementations of PAM known to this library (Linux-PAM, OpenPAM,
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214 /// and Sun) ignore `pamh` and will accept a null pointer.
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215 pub fn pam_strerror(pamh: *const pam_handle, error_number: c_int) -> *mut c_char;
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216 }
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217
134
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218 #[cfg(any(pam_impl = "LinuxPam", pam_impl = "OpenPam"))]
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219 extern "C" {
131
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220 /// Gets `PAM_AUTHTOK`, or asks the user if that is unset.
130
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221 pub fn pam_get_authtok(
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222 pamh: *mut pam_handle,
131
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223 item: c_int,
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224 authtok: *mut *const c_char,
130
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225 prompt: *const c_char,
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226 ) -> c_int;
133
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227
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228 pub fn pam_prompt(
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229 pamh: *const pam_handle,
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230 style: c_int,
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231 response: *mut *mut c_char,
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232 fmt: *const c_char,
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233 ...
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234 ) -> c_int;
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235
127
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236 }
131
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237
134
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238 #[cfg(pam_impl = "LinuxPam")]
131
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239 extern "C" {
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240 pub fn pam_fail_delay(pamh: *mut pam_handle, musec_delay: c_uint) -> c_int;
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241
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242 /// Start a PAM transaction based on configuration in the given directory.
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243 pub fn pam_start_confdir(
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244 service_name: *const c_char,
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245 user: *const c_char,
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246 pam_conversation: *mut pam_conv,
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247 confdir: *const c_char,
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248 pamh: *mut *mut pam_handle,
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249 ) -> c_int;
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250
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251 // We don't export the v-variants of the formatting functions.
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252
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253 pub fn pam_syslog(pamh: *const pam_handle, priority: c_int, fmt: *const c_char, ...);
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254
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255 pub fn pam_get_authtok_noverify(
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256 pamh: *const pam_handle,
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257 authtok: *mut *const c_char,
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258 prompt: *const c_char,
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259 ) -> c_int;
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260
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261 pub fn pam_get_authtok_verify(
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262 pamh: *const pam_handle,
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263 authtok: *mut *const c_char,
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264 prompt: *const c_char,
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265 ) -> c_int;
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266
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267 // pam_modutil also lives in libpam for Linux.
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268
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269 pub fn pam_modutil_check_user_in_passwd(
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270 pamh: *mut pam_handle,
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271 user_name: *const c_char,
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272 file_name: *const c_char,
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273 ) -> c_int;
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274
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275 pub fn pam_modutil_getpwnam(pamh: *mut pam_handle, user: *const c_char) -> *mut libc::passwd;
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276
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277 pub fn pam_modutil_getpwuid(pamh: *mut pam_handle, uid: libc::uid_t) -> *mut libc::passwd;
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278
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279 pub fn pam_modutil_getgrnam(pamh: *mut pam_handle, group: *const c_char) -> *mut libc::group;
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280
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281 pub fn pam_modutil_getgrgid(pamh: *mut pam_handle, gid: libc::gid_t) -> *mut libc::group;
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282
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283 pub fn pam_modutil_getspnam(pamh: *mut pam_handle, user: *const c_char) -> *mut libc::spwd;
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284
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285 pub fn pam_modutil_user_in_group_nam_nam(
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286 pamh: *mut pam_handle,
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287 user: *const c_char,
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288 group: *const c_char,
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289 ) -> c_int;
158
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290
131
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291 pub fn pam_modutil_user_in_group_nam_gid(
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292 pamh: *mut pam_handle,
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293 user: *const c_char,
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294 group: libc::gid_t,
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295 ) -> c_int;
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296
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297 pub fn pam_modutil_user_in_group_uid_nam(
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298 pamh: *mut pam_handle,
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299 user: libc::uid_t,
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300 group: *const c_char,
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301 ) -> c_int;
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302
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303 pub fn pam_modutil_user_in_group_uid_gid(
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304 pamh: *mut pam_handle,
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305 user: libc::uid_t,
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306 group: libc::gid_t,
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307 ) -> c_int;
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308
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309 pub fn pam_modutil_getlogin(pamh: *mut pam_handle) -> *const c_char;
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310
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311 pub fn pam_modutil_read(fd: c_int, buffer: *mut c_char, count: c_int) -> c_int;
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312
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313 pub fn pam_modutil_write(fd: c_int, buffer: *const c_char, count: c_int) -> c_int;
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314
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315 pub fn pam_modutil_audit_write(
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316 pamh: *mut pam_handle,
137
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317 type_: c_int,
131
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318 message: *const c_char,
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319 retval: c_int,
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320 ) -> c_int;
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321
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322 pub fn pam_modutil_drop_priv(
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323 pamh: *mut pam_handle,
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324 p: *mut pam_modutil_privs,
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325 pw: *const libc::passwd,
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326 ) -> c_int;
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327
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328 pub fn pam_modutil_regain_priv(pamh: *mut pam_handle, p: *mut pam_modutil_privs) -> c_int;
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329
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330 pub fn pam_modutil_sanitize_helper_fds(
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331 pamh: *mut pam_handle,
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332 redirect_stdin: pam_modutil_redirect_fd,
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333 redirect_stdout: pam_modutil_redirect_fd,
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334 redirect_stderr: pam_modutil_redirect_fd,
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335 ) -> c_int;
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336
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337 pub fn pam_modutil_search_key(
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338 pamh: *mut pam_handle,
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339 file_name: *const c_char,
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340 key: *const c_char,
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341 ) -> *mut c_char;
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342 }
133
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343
134
6c1e1bdb4164 Use standard #[cfg] directives rather than custom proc macros.
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344 #[cfg(pam_impl = "OpenPam")]
133
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345 extern "C" {
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346 pub fn openpam_borrow_cred(pamh: *mut pam_handle, passwd: *const libc::passwd) -> c_int;
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347
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348 pub fn openpam_subst(
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349 pamh: *const pam_handle,
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350 buf: *mut c_char,
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351 _bufsize: *mut usize,
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352 _template: *const c_char,
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353 ) -> c_int;
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354
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355 pub fn openpam_free_data(pamh: *mut pam_handle, data: *mut c_void, status: c_int);
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356
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357 pub fn openpam_free_envlist(_envlist: *mut *mut c_char);
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358
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359 pub fn openpam_get_option(_pamh: *mut pam_handle, _option: *const c_char) -> *const c_char;
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360
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361 pub fn openpam_restore_cred(pamh: *mut pam_handle) -> c_int;
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362
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363 pub fn openpam_set_option(
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364 _pamh: *mut pam_handle,
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365 _option: *const c_char,
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366 _value: *const c_char,
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367 ) -> c_int;
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368
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369 pub fn pam_error(pamh: *const pam_handle, _fmt: *const c_char, ...) -> c_int;
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370
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371 pub fn pam_info(_pamh: *const pam_handle, _fmt: *const c_char, ...) -> c_int;
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372
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373 pub fn openpam_readline(
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374 _f: *mut libc::FILE,
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375 _lineno: *mut c_int,
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376 _lenp: *mut usize,
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377 ) -> *mut c_char;
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378
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379 pub fn openpam_readlinev(
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380 _f: *mut libc::FILE,
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381 _lineno: *mut c_int,
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382 _lenp: *mut c_int,
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383 ) -> *mut *mut c_char;
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384
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385 pub fn openpam_readword(
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386 _f: *mut libc::FILE,
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387 _lineno: *mut c_int,
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388 _lenp: *mut usize,
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389 ) -> *mut c_char;
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390
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391 pub fn openpam_straddch(
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392 _str: *mut *mut c_char,
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393 _sizep: *mut usize,
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394 _lenp: *mut usize,
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diff changeset
395 ch: c_int,
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diff changeset
396 ) -> c_int;
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397
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398 pub fn openpam_set_feature(_feature: c_int, _onoff: c_int) -> c_int;
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399
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400 pub fn openpam_get_feature(_feature: c_int, _onoff: *mut c_int) -> c_int;
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401
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402 pub fn _openpam_log(_level: c_int, _func: *const c_char, _fmt: *const c_char, ...);
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403
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diff changeset
404 /// A premade conversation function that talks to the TTY.
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405 ///
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diff changeset
406 /// ```no_run
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diff changeset
407 /// # use std::ffi::CString;
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diff changeset
408 /// # use std::ptr;
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409 /// use libpam_sys::*;
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diff changeset
410 /// # let service = CString::new("whatever").unwrap();
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diff changeset
411 /// # let user = CString::new("whatever").unwrap();
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412 /// let mut handle: *mut pam_handle = ptr::null_mut();
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413 /// let mut conv = pam_conv {
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414 /// conv: openpam_ttyconv,
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415 /// appdata_ptr: ptr::null_mut(),
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416 /// };
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417 /// let result = unsafe { pam_start(service.as_ptr(), user.as_ptr(), &mut conv, &mut handle) };
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418 /// ```
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419 pub fn openpam_ttyconv(
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420 n: c_int,
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421 _msg: *const *const pam_message,
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422 _resp: *mut *mut pam_response,
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423 _data: *mut c_void,
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424 ) -> c_int;
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425
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426 pub static mut openpam_ttyconv_timeout: c_int;
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427
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428 /// A null conversation function.
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429 ///
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430 /// ```no_run
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431 /// # use std::ffi::CString;
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432 /// # use std::ptr;
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433 /// use libpam_sys::*;
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434 /// # let service = CString::new("whatever").unwrap();
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435 /// # let user = CString::new("whatever").unwrap();
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436 /// let mut handle: *mut pam_handle = ptr::null_mut();
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437 /// let mut conv = pam_conv {
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438 /// conv: openpam_nullconv,
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439 /// appdata_ptr: ptr::null_mut(),
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440 /// };
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441 /// let result = unsafe { pam_start(service.as_ptr(), user.as_ptr(), &mut conv, &mut handle) };
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442 /// ```
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443 pub fn openpam_nullconv(
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444 n: c_int,
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445 _msg: *const *const pam_message,
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446 _resp: *mut *mut pam_response,
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447 _data: *mut c_void,
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448 ) -> c_int;
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449 }
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450
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451 #[cfg(pam_impl = "Sun")]
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452 extern "C" {
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453 pub fn __pam_get_authtok(
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454 pamh: *mut pam_handle,
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455 source: c_int,
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456 type_: c_int,
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457 prompt: *const c_char,
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458 authtok: *mut *mut c_char,
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459 ) -> c_int;
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460
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461 pub fn __pam_log(priority: c_int, format: *const c_char, ...);
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462 }