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annotate src/conv.rs @ 62:d83623951070

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Further improve docs and put `conv` behind a feature gate.
author Paul Fisher <paul@pfish.zone>
date Wed, 21 May 2025 23:10:09 -0400
parents 05cc2c27334f
children a7aa5ca0d00d
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1 //! The [Conversation] struct, for interacting with the user.
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2 //!
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3 //! This module is experimental and will probably be rewritten in the future
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4 //! to improve the interface for both PAM modules and clients.
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5
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6 use libc::{c_char, c_int};
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7 use std::ffi::{CStr, CString};
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8 use std::ptr;
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9
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10 use crate::constants::ErrorCode;
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11 use crate::constants::MessageStyle;
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12 use crate::constants::Result;
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13 use crate::items::Item;
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15 #[repr(C)]
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16 struct Message {
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17 msg_style: MessageStyle,
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18 msg: *const c_char,
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19 }
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21 #[repr(C)]
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22 struct Response {
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23 resp: *const c_char,
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24 resp_retcode: libc::c_int, // Unused - always zero
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25 }
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27 #[doc(hidden)]
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28 #[repr(C)]
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29 pub struct Inner {
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30 conv: extern "C" fn(
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31 num_msg: c_int,
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32 pam_message: &&Message,
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33 pam_response: &mut *const Response,
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34 appdata_ptr: *const libc::c_void,
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35 ) -> c_int,
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36 appdata_ptr: *const libc::c_void,
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37 }
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38
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39 /// A communication channel with the user.
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40 ///
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41 /// Use this to communicate with the user, if needed, beyond the standard
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42 /// things you can get/set with `get_user`/`get_authtok` and friends.
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43 /// The PAM client (i.e., the application that is logging in) will present
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44 /// the messages you send to the user and ask for responses.
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45 pub struct Conversation<'a>(&'a Inner);
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46
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47 impl Conversation<'_> {
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48 /// Sends a message to the PAM client.
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49 ///
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50 /// This will typically result in the user seeing a message or a prompt.
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51 /// For details, see what [MessageStyle]s are available.
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52 ///
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53 /// Note that the user experience will depend on how each style
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54 /// is implemented by the client, and that not all clients
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55 /// will implement all message styles.
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56 pub fn send(&self, style: MessageStyle, msg: &str) -> Result<Option<&CStr>> {
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57 let mut resp_ptr: *const Response = ptr::null();
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58 let msg_cstr = CString::new(msg).unwrap();
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59 let msg = Message {
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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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63 // TODO: These need to be freed!
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64 let ret = (self.0.conv)(1, &&msg, &mut resp_ptr, self.0.appdata_ptr);
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65 ErrorCode::result_from(ret)?;
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66
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67 let result = unsafe {
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68 match (*resp_ptr).resp {
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69 p if p.is_null() => None,
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70 p => Some(CStr::from_ptr(p)),
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71 }
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72 };
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73 Ok(result)
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74 }
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75 }
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77 impl Item for Conversation<'_> {
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78 type Raw = Inner;
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80 fn type_id() -> crate::items::ItemType {
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81 crate::items::ItemType::Conversation
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82 }
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83
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84 unsafe fn from_raw(raw: *const Self::Raw) -> Self {
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85 Self(&*raw)
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86 }
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87
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88 fn into_raw(self) -> *const Self::Raw {
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89 self.0 as _
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90 }
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91 }