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1 use libc::{c_char, c_int}; |
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2 use std::{ptr}; |
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3 use std::ffi::{CStr, CString}; |
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4 |
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5 use constants; |
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6 use constants::*; |
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7 use module::{PamItem, PamResult}; |
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8 |
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9 #[allow(missing_copy_implementations)] |
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10 pub enum AppDataPtr {} |
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11 |
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12 #[repr(C)] |
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13 struct PamMessage { |
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14 msg_style: PamMessageStyle, |
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15 msg: *const c_char, |
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16 } |
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17 |
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18 #[repr(C)] |
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19 struct PamResponse { |
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20 resp: *const c_char, |
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21 resp_retcode: AlwaysZero, |
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22 } |
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23 |
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24 /// `PamConv` acts as a channel for communicating with user. |
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25 /// |
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26 /// Communication is mediated by the pam client (the application that invoked |
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27 /// pam). Messages sent will be relayed to the user by the client, and response |
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28 /// will be relayed back. |
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29 #[repr(C)] |
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30 pub struct PamConv { |
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31 conv: extern fn(num_msg: c_int, |
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32 pam_message: &&PamMessage, |
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33 pam_response: &*mut PamResponse, |
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34 appdata_ptr: *const AppDataPtr |
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35 ) -> PamResultCode, |
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36 appdata_ptr: *const AppDataPtr, |
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37 } |
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38 |
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39 impl PamConv { |
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40 /// Sends a message to the pam client. |
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41 /// |
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42 /// This will typically result in the user seeing a message or a prompt. |
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43 /// There are several message styles available: |
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44 /// |
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45 /// - PAM_PROMPT_ECHO_OFF |
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46 /// - PAM_PROMPT_ECHO_ON |
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47 /// - PAM_ERROR_MSG |
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48 /// - PAM_TEXT_INFO |
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49 /// - PAM_RADIO_TYPE |
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50 /// - PAM_BINARY_PROMPT |
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51 /// |
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52 /// Note that the user experience will depend on how the client implements |
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53 /// these message styles - and not all applications implement all message |
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54 /// styles. |
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55 pub fn send(&self, style: PamMessageStyle, msg: &str) -> PamResult<Option<String>> { |
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56 let resp_ptr: *mut PamResponse = ptr::null_mut(); |
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57 let msg = PamMessage { |
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58 msg_style: style, |
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59 msg: CString::new(msg).unwrap().as_ptr(), |
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60 }; |
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61 |
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62 let ret = (self.conv)(1, &&msg, &resp_ptr, self.appdata_ptr); |
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63 |
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64 if constants::PAM_SUCCESS == ret { |
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65 let s = unsafe { resp_ptr.as_ref() } |
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66 .and_then(|r| { |
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67 if r.resp.is_null() { |
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68 None |
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69 } |
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70 else { |
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71 let bytes = unsafe { CStr::from_ptr(r.resp).to_bytes() }; |
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72 String::from_utf8(bytes.to_vec()).ok() |
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73 } |
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74 }); |
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75 Ok(s) |
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76 } else { |
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77 Err(ret) |
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78 } |
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79 } |
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80 } |
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81 |
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82 impl PamItem for PamConv { |
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83 fn item_type(_: Option<Self>) -> PamItemType { PAM_CONV } |
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84 } |
