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Catch FormatException in packet decoding.

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This commit is contained in:
Zach Anderson
2019-08-13 12:26:21 -07:00
parent caf02e0174
commit a9335ed4c7
4 changed files with 266 additions and 1 deletions
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3
packages/multicast_dns/CHANGELOG.md
View File

@ -1,3 +1,6 @@
## 0.2.1
* Fixes the handling of packets containing non-utf8 strings.
## 0.2.0
* Allow configuration of the port and address the mdns query is performed on.

3
packages/multicast_dns/lib/src/packet.dart
View File

@ -366,6 +366,9 @@ List<ResourceRecord> decodeMDnsResponse(List<int> packet) {
} on MDnsDecodeException {
// If decoding fails return null.
return null;
} on FormatException {
// If decoding fails on a non-utf8 packet, return null.
return null;
}
return result;
}

2
packages/multicast_dns/pubspec.yaml
View File

@ -2,7 +2,7 @@ name: multicast_dns
description: Dart package for mDNS queries (e.g. Bonjour, Avahi).
author: Flutter Team <flutter-dev@googlegroups.com>
homepage: https://github.com/flutter/packages/tree/master/packages/multicast_dns
version: 0.2.0
version: 0.2.1
dependencies:
meta: ^1.1.6

259
packages/multicast_dns/test/decode_test.dart
View File

@ -13,6 +13,7 @@ const int _kSrvHeaderSize = 6;
void main() {
testValidPackages();
testBadPackages();
testNonUtf8Packages();
// testHexDumpList();
testPTRRData();
testSRVRData();
@ -175,6 +176,12 @@ void testBadPackages() {
});
}
void testNonUtf8Packages() {
test('Returns null for non-utf8 text resource', () {
expect(decodeMDnsResponse(nonUtf8Package), isNull);
});
}
void testPTRRData() {
test('Can read FQDN from PTR data', () {
expect('sgjesse-macbookpro2 [78:31:c1:b8:55:38]._workstation._tcp.local',
@ -1178,3 +1185,255 @@ const List<int> packetWithoutQuestionWithAnArCount = <int>[
50,
51,
];
// Package with a text resource that is not valid utf8.
const List<int> nonUtf8Package = <int>[
0x00,
0x00,
0x84,
0x00,
0x00,
0x00,
0x00,
0x08,
0x00,
0x00,
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0x6f,
0x63,
0x61,
0x6c,
0x00,
0x00,
0x10,
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