hackgt_nfc/
nfc.rs

1use pcsc::*;
2use std::thread::{ self, JoinHandle };
3use std::collections::HashMap;
4use std::ffi::CStr;
5
6mod badge;
7mod ndef;
8pub use badge::NFCBadge;
9
10pub fn handle_cards<F, G>(card_handler: F, reader_handler: G) -> JoinHandle<()>
11	where F: Fn(&Card, &CStr, usize),
12		  F: Send + 'static,
13		  G: Fn(&CStr, bool),
14		  G: Send + 'static,
15{
16	thread::spawn(move || {
17		let mut ctx = Context::establish(Scope::User).expect("Failed to establish context");
18
19		let mut readers_buf = [0; 2048];
20		let mut reader_states = vec![
21			// Listen for reader insertions/removals, if supported
22			ReaderState::new(PNP_NOTIFICATION(), State::UNAWARE),
23		];
24		// Keeps track of which readers have an active card
25		let mut readers = HashMap::new();
26		loop {
27			// Remove dead readers
28			fn is_invalid(rs: &ReaderState) -> bool {
29				rs.event_state().intersects(State::UNKNOWN | State::IGNORE)
30			}
31			reader_states.retain(|rs| {
32				let should_keep = !is_invalid(rs);
33				if !should_keep {
34					// Notify about removal
35					reader_handler(rs.name(), false);
36				}
37				should_keep
38			});
39
40			// Add new readers
41			let names = match ctx.list_readers(&mut readers_buf) {
42				Ok(names) => names,
43				Err(pcsc::Error::ServiceStopped) | Err(pcsc::Error::NoService) => {
44					// Windows will kill the SmartCard service when the last reader is disconnected
45					// Restart it and wait (sleep) for a new reader connection if that occurs
46					ctx = Context::establish(Scope::User).expect("Failed to establish context");
47					continue;
48				}
49				Err(err) => { panic!("Failed to list readers: {:?}", err) }
50			};
51
52			for name in names {
53				// Ignore the pseudo reader created by Windows Hello
54				if !reader_states.iter().any(|rs| rs.name() == name) && !name.to_str().unwrap().contains("Windows Hello") {
55					reader_handler(name, true);
56					reader_states.push(ReaderState::new(name, State::UNAWARE));
57				}
58			}
59
60			// Update the view of the state to wait on
61			for rs in &mut reader_states {
62				rs.sync_current_state();
63			}
64
65			// Wait until the state changes
66			match ctx.get_status_change(None, &mut reader_states) {
67				Ok(()) => {},
68				Err(pcsc::Error::ServiceStopped) | Err(pcsc::Error::NoService) => {
69					// Windows will kill the SmartCard service when the last reader is disconnected
70					// Restart it and wait (sleep) for a new reader connection if that occurs
71					ctx = Context::establish(Scope::User).expect("Failed to establish context");
72					continue;
73				}
74				Err(err) => { panic!("Failed to get status change: {:?}", err) }
75			};
76
77			for (reader_index, rs) in reader_states.iter().enumerate() {
78				if rs.name() == PNP_NOTIFICATION() { continue; }
79
80				let name = rs.name().to_owned();
81				// Debounce repeated events
82				if rs.event_state().intersects(State::PRESENT) {
83					if !readers.get(&name).unwrap_or(&false) {
84						// Card is tapped
85						// Connect to the card.
86						match ctx.connect(rs.name(), ShareMode::Shared, Protocols::ANY) {
87							Ok(card) => card_handler(&card, rs.name(), reader_index),
88							Err(Error::NoSmartcard) => {
89								eprintln!("A smartcard is not present in the reader");
90							}
91							Err(err) => {
92								eprintln!("Failed to connect to card: {}", err);
93							}
94						};
95					}
96					readers.insert(name, true);
97				}
98				else if rs.event_state().intersects(State::EMPTY) {
99					readers.insert(name, false);
100				}
101			}
102		}
103	})
104}
hackgt_nfc/nfc.rs

hackgt_nfc/
nfc.rs
