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annotate pam/src/conv.rs @ 34:ec70822cbdef

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Overhaul
author Andy Caldwell <andrew.caldwell@metaswitch.com>
date Sun, 24 Apr 2022 03:42:11 +0100
parents 1f4ef4c7e555
children 50371046c61a
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1 use libc::{c_char, c_int};
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2 use std::ffi::{CStr, CString};
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3 use std::ptr;
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4
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5 use constants::PamResultCode;
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6 use constants::PamMessageStyle;
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7 use items::Item;
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8 use module::PamResult;
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9
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10 #[repr(C)]
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11 struct PamMessage {
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12 msg_style: PamMessageStyle,
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13 msg: *const c_char,
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14 }
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16 #[repr(C)]
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17 struct PamResponse {
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18 resp: *const c_char,
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19 resp_retcode: libc::c_int, // Unused - always zero
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20 }
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22 /// `PamConv` acts as a channel for communicating with user.
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23 ///
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24 /// Communication is mediated by the pam client (the application that invoked
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25 /// pam). Messages sent will be relayed to the user by the client, and response
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26 /// will be relayed back.
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27 #[repr(C)]
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28 pub struct Inner {
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29 conv: extern "C" fn(
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30 num_msg: c_int,
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31 pam_message: &&PamMessage,
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32 pam_response: &mut *const PamResponse,
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33 appdata_ptr: *const libc::c_void,
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34 ) -> PamResultCode,
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35 appdata_ptr: *const libc::c_void,
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36 }
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38 pub struct Conv<'a>(&'a Inner);
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39
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40 impl<'a> Conv<'a> {
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41 /// Sends a message to the pam client.
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42 ///
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43 /// This will typically result in the user seeing a message or a prompt.
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44 /// There are several message styles available:
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45 ///
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46 /// - PAM_PROMPT_ECHO_OFF
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47 /// - PAM_PROMPT_ECHO_ON
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48 /// - PAM_ERROR_MSG
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49 /// - PAM_TEXT_INFO
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50 /// - PAM_RADIO_TYPE
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51 /// - PAM_BINARY_PROMPT
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52 ///
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53 /// Note that the user experience will depend on how the client implements
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54 /// these message styles - and not all applications implement all message
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55 /// styles.
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56 pub fn send(&self, style: PamMessageStyle, msg: &str) -> PamResult<Option<&CStr>> {
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57 let mut resp_ptr: *const PamResponse = ptr::null();
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58 let msg_cstr = CString::new(msg).unwrap();
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59 let msg = PamMessage {
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60 msg_style: style,
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61 msg: msg_cstr.as_ptr(),
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62 };
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64 let ret = (self.0.conv)(1, &&msg, &mut resp_ptr, self.0.appdata_ptr);
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66 if PamResultCode::PAM_SUCCESS == ret {
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67 // PamResponse.resp is null for styles that don't return user input like PAM_TEXT_INFO
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68 let response = unsafe { (*resp_ptr).resp };
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69 if response.is_null() {
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70 Ok(None)
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71 } else {
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72 Ok(Some(unsafe { CStr::from_ptr(response) }))
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73 }
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74 } else {
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75 Err(ret)
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76 }
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77 }
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78 }
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79
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80 impl<'a> Item for Conv<'a> {
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81 type Raw = Inner;
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82
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83 fn type_id() -> crate::items::ItemType {
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84 crate::items::ItemType::Conv
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85 }
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86
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87 unsafe fn from_raw(raw: *const Self::Raw) -> Self {
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88 Self(&*raw)
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89 }
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90
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91 fn into_raw(self) -> *const Self::Raw {
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92 self.0 as _
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93 }
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94 }