1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
|
use std::io;
use std::path::Path;
use crate::{
Result,
Packet,
Container,
PacketPile,
};
use crate::parse::{
PacketParserBuilder,
PacketParserResult,
PacketParser,
Parse,
Cookie
};
use buffered_reader::BufferedReader;
/// A `PacketPileParser` parses an OpenPGP message with the convenience
/// of `PacketPile::from_file` and the flexibility of a `PacketParser`.
///
/// Like `PacketPile::from_file` (and unlike `PacketParser`), a
/// `PacketPileParser` parses an OpenPGP message and returns a `PacketPile`.
/// But, unlike `PacketPile::from_file` (and like `PacketParser`), it
/// allows the caller to inspect each packet as it is being parsed.
///
/// Thus, using a `PacketPileParser`, it is possible to decide on a
/// per-packet basis whether to stream, buffer or drop the packet's
/// body, whether to recurse into a container, or whether to abort
/// processing, for example. And, `PacketPileParser` conveniently packs
/// the packets into a `PacketPile`.
///
/// If old packets don't need to be retained, then `PacketParser`
/// should be preferred. If no per-packet processing needs to be
/// done, then `PacketPile::from_file` will be slightly faster.
///
/// Note: due to how lifetimes interact, it is not possible for the
/// [`next()`] and [`recurse()`] methods to return a mutable reference
/// to the packet (`&mut Packet`) that is currently being processed
/// while continuing to support streaming operations. It is also not
/// possible to return a mutable reference to the `PacketParser`.
/// Thus, we expose the `PacketParserResult` directly to the user.
/// *However*, do *not* directly call `PacketParser::next()` or
/// `PacketParser::recurse()`. This will break the `PacketPileParser`
/// implementation.
///
/// [`next()`]: #method.next
/// [`recurse()`]: #method.recurse
///
/// # Examples
///
/// ```rust
/// # extern crate sequoia_openpgp as openpgp;
/// # use openpgp::Result;
/// # use openpgp::parse::{Parse, PacketPileParser};
/// # let _ = f(include_bytes!("../../tests/data/keys/public-key.gpg"));
/// #
/// # fn f(message_data: &[u8]) -> Result<()> {
/// let mut ppp = PacketPileParser::from_bytes(message_data)?;
/// while ppp.recurse() {
/// let pp = ppp.ppr.as_mut().unwrap();
/// eprintln!("{:?}", pp);
/// }
/// let message = ppp.finish();
/// message.pretty_print();
/// # Ok(())
/// # }
/// ```
#[derive(Debug)]
pub struct PacketPileParser<'a> {
/// The current packet.
pub ppr: PacketParserResult<'a>,
/// Whether the first packet has been returned.
returned_first: bool,
/// The packet pile that has been assembled so far.
pile: PacketPile,
}
impl<'a> PacketParserBuilder<'a> {
/// Finishes configuring the `PacketParser` and returns a
/// `PacketPileParser`.
pub fn into_packet_pile_parser(self) -> Result<PacketPileParser<'a>>
where Self: 'a {
PacketPileParser::from_packet_parser(self.finalize()?)
}
}
impl<'a> Parse<'a, PacketPileParser<'a>> for PacketPileParser<'a> {
/// Creates a `PacketPileParser` to parse the OpenPGP message stored
/// in the `io::Read` object.
fn from_reader<R: io::Read + 'a>(reader: R)
-> Result<PacketPileParser<'a>> {
let bio = Box::new(buffered_reader::Generic::with_cookie(
reader, None, Cookie::default()));
PacketPileParser::from_buffered_reader(bio)
}
/// Creates a `PacketPileParser` to parse the OpenPGP message stored
/// in the file named by `path`.
fn from_file<P: AsRef<Path>>(path: P)
-> Result<PacketPileParser<'a>> {
PacketPileParser::from_buffered_reader(
Box::new(buffered_reader::File::with_cookie(path, Cookie::default())?))
}
/// Creates a `PacketPileParser` to parse the OpenPGP message stored
/// in the provided buffer.
fn from_bytes<D: AsRef<[u8]> + ?Sized>(data: &'a D)
-> Result<PacketPileParser<'a>> {
let bio = Box::new(buffered_reader::Memory::with_cookie(
data.as_ref(), Cookie::default()));
PacketPileParser::from_buffered_reader(bio)
}
}
impl<'a> PacketPileParser<'a> {
/// Creates a `PacketPileParser` from a *fresh* `PacketParser`.
fn from_packet_parser(ppr: PacketParserResult<'a>)
-> Result<PacketPileParser<'a>>
{
Ok(PacketPileParser {
pile: PacketPile { top_level: Container::new() },
ppr: ppr,
returned_first: false,
})
}
/// Creates a `PacketPileParser` to parse the OpenPGP message stored
/// in the `BufferedReader` object.
pub(crate) fn from_buffered_reader(bio: Box<dyn BufferedReader<Cookie> + 'a>)
-> Result<PacketPileParser<'a>> {
Self::from_packet_parser(PacketParser::from_buffered_reader(bio)?)
}
/// Inserts the next packet into the `PacketPile`.
fn insert_packet(&mut self, packet: Packet, position: isize) {
// Find the right container.
let mut container = &mut self.pile.top_level;
assert!(position >= 0);
for i in 0..position {
// The most recent child.
let tmp = container;
let packets_len = tmp.packets.len();
let p = &mut tmp.packets[packets_len - 1];
if p.children().next().is_none() {
if i == position - 1 {
// This is the leaf. Create a new container
// here.
p.set_children(Some(Container::new()));
} else {
panic!("Internal inconsistency while building message.");
}
}
container = p.children_mut().unwrap();
}
container.packets.push(packet);
}
/// Finishes parsing the current packet and starts parsing the
/// next one. This function recurses, if possible.
///
/// This function finishes parsing the current packet. By
/// default, any unread content is dropped. It then creates a new
/// packet parser for the next packet. If the current packet is a
/// container, this function tries to recurse into it. Otherwise,
/// it returns the following packet.
///
/// Due to lifetime issues, this function does not return a
/// reference to the `PacketParser`, but a boolean indicating
/// whether a new packet is available. Instead, the
/// `PacketParser` can be accessed as `self.ppo`.
pub fn recurse(&mut self) -> bool {
if self.returned_first {
match self.ppr.take() {
PacketParserResult::Some(pp) => {
match pp.recurse() {
Ok((packet, ppr)) => {
self.insert_packet(
packet,
ppr.last_recursion_depth().unwrap() as isize);
self.ppr = ppr;
}
Err(_) => {
// XXX: What should we do with the error?
}
}
}
eof @ PacketParserResult::EOF(_) => {
self.ppr = eof;
}
}
} else {
self.returned_first = true;
}
!self.is_done()
}
/// Finishes parsing the current packet and starts parsing the
/// next one. This function does not recurse.
///
/// This function finishes parsing the current packet. By
/// default, any unread content is dropped. It then creates a new
/// packet parser for the following packet. If the current packet
/// is a container, this function does *not* recurse into the
/// container; it skips any packets that it may contain.
///
/// Due to lifetime issues, this function does not return a
/// reference to the `PacketParser`, but a boolean indicating
/// whether a new packet is available. Instead, the
/// `PacketParser` can be accessed as `self.ppo`.
pub fn next(&mut self) -> bool {
if self.returned_first {
match self.ppr.take() {
PacketParserResult::Some(pp) => {
match pp.next() {
Ok((packet, ppr)) => {
self.insert_packet(
packet,
ppr.last_recursion_depth().unwrap() as isize);
self.ppr = ppr;
}
Err(_) => {
// XXX: What should we do with the error?
}
}
},
eof @ PacketParserResult::
|