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[dns] add helper methods to append/parse DNS names (#5922)

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This commit adds `Dns::Name` type which provides a set of helper
methods to encode/decode DNS names. `AppendName()` method encodes and
appends a full name (e.g., "test.example.com") to a message. Other
helper methods enable appending labels (or groups of labels) and/or
constructing a compressed name (using pointer labels). `ParseName()`
method parses and skips over a full name in a message. `ReadLabel()`
method reads labels one by one and works independently of whether the
encoded name is compressed or not. `ReadName()` method read an entire
name from message. The new methods are used in `Dns::Client`.

This commit also add a unit test `test-dns` covering the behavior of
the newly added helper methods.

Finally, this commit adds few helper methods in `ResourceRecords` to
get the size and check the type of a DNS record.
This commit is contained in:
Abtin Keshavarzian
2020-12-08 12:20:19 -08:00
committed by GitHub
parent c70e47d16c
commit 73126f7099
15 changed files with 1196 additions and 128 deletions
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tests/unit/test_string.cpp
+22
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@@ -154,6 +154,27 @@ void TestUtf8(void)
printf(" -- PASS\n");
}
void TestStringFind(void)
{
char emptyString[1] = {'\0'};
char testString[] = "foo.bar\\.";
printf("\nTest 6: StringFind() function\n");
VerifyOrQuit(StringFind(testString, 'f') == testString, "StringFind() failed");
VerifyOrQuit(StringFind(testString, 'o') == &testString[1], "StringFind() failed");
VerifyOrQuit(StringFind(testString, '.') == &testString[3], "StringFind() failed");
VerifyOrQuit(StringFind(testString, 'r') == &testString[6], "StringFind() failed");
VerifyOrQuit(StringFind(testString, '\\') == &testString[7], "StringFind() failed");
VerifyOrQuit(StringFind(testString, 'x') == nullptr, "StringFind() failed");
VerifyOrQuit(StringFind(testString, ',') == nullptr, "StringFind() failed");
VerifyOrQuit(StringFind(emptyString, 'f') == nullptr, "StringFind() failed");
VerifyOrQuit(StringFind(emptyString, '.') == nullptr, "StringFind() failed");
printf(" -- PASS\n");
}
} // namespace ot
int main(void)
@@ -161,6 +182,7 @@ int main(void)
ot::TestString();
ot::TestStringLength();
ot::TestUtf8();
ot::TestStringFind();
printf("\nAll tests passed.\n");
return 0;
}