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Code Issues Releases Wiki Activity

[5582] Fixed handling of unicode escapes

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This commit is contained in:
Francis Dupont 2018-06-18 17:11:05 +02:00
parent 4d388fbfea
commit ba9b18cf2a
2 changed files with 74 additions and 3 deletions
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45
src/lib/cc/data.cc
View File

@ -357,6 +357,7 @@ strFromStringstream(std::istream& in, const std::string& file,
while (c != EOF && c != '"') {
if (c == '\\') {
// see the spec for allowed escape characters
int d;
switch (in.peek()) {
case '"':
c = '"';
@ -382,6 +383,48 @@ strFromStringstream(std::istream& in, const std::string& file,
case 't':
c = '\t';
break;
case 'u':
// skip first 0
in.ignore();
++pos;
c = in.peek();
if (c != '0') {
throwJSONError("Unsupported unicode escape", file, line, pos);
}
// skip second 0
in.ignore();
++pos;
c = in.peek();
if (c != '0') {
throwJSONError("Unsupported unicode escape", file, line, pos - 2);
}
// get first digit
in.ignore();
++pos;
d = in.peek();
if ((d >= '0') && (d <= '9')) {
c = (d - '0') << 4;
} else if ((d >= 'A') && (d <= 'F')) {
c = (d - 'A' + 10) << 4;
} else if ((d >= 'a') && (d <= 'f')) {
c = (d - 'a' + 10) << 4;
} else {
throwJSONError("Not hexadecimal in unicode escape", file, line, pos - 3);
}
// get second digit
in.ignore();
++pos;
d = in.peek();
if ((d >= '0') && (d <= '9')) {
c |= d - '0';
} else if ((d >= 'A') && (d <= 'F')) {
c |= d - 'A' + 10;
} else if ((d >= 'a') && (d <= 'f')) {
c |= d - 'a' + 10;
} else {
throwJSONError("Not hexadecimal in unicode escape", file, line, pos - 4);
}
break;
default:
throwJSONError("Bad escape", file, line, pos);
}
@ -797,7 +840,7 @@ StringElement::toJSON(std::ostream& ss) const {
ss << '\\' << 't';
break;
default:
if ((c >= 0) && (c < 0x20)) {
if (((c >= 0) && (c < 0x20)) || (c < 0) || (c >= 0x7f)) {
std::ostringstream esc;
esc << "\\u"
<< hex

32
src/lib/cc/tests/data_unittests.cc
View File

@ -100,7 +100,7 @@ TEST(Element, from_and_to_json) {
// We should confirm that our string handling is 8-bit clean.
// At one point we were using char-length data and comparing to EOF,
// which means that character '\xFF' would not parse properly.
sv.push_back("\"\xFF\"");
sv.push_back("\"\\u00ff\"");
BOOST_FOREACH(const std::string& s, sv) {
// Test two types of fromJSON(): with string and istream.
@ -150,7 +150,12 @@ TEST(Element, from_and_to_json) {
// String not delimited correctly
sv.push_back("\"hello");
sv.push_back("hello\"");
// Bad unicode
sv.push_back("\"\\u123\"");
sv.push_back("\"\\u1234\"");
sv.push_back("\"\\u0123\"");
sv.push_back("\"\\u00ag\"");
sv.push_back("\"\\u00BH\"");
BOOST_FOREACH(std::string s, sv) {
EXPECT_THROW(el = Element::fromJSON(s), isc::data::JSONError);
@ -550,11 +555,21 @@ TEST(Element, escape) {
escapeHelper("foo\nbar", "\"foo\\nbar\"");
escapeHelper("foo\rbar", "\"foo\\rbar\"");
escapeHelper("foo\tbar", "\"foo\\tbar\"");
escapeHelper("foo\u001fbar", "\"foo\\u001fbar\"");
// Bad escapes
EXPECT_THROW(Element::fromJSON("\\a"), JSONError);
EXPECT_THROW(Element::fromJSON("\\"), JSONError);
// Can't have escaped quotes outside strings
EXPECT_THROW(Element::fromJSON("\\\"\\\""), JSONError);
// Unicode use lower u and 4 hexa, only 00 prefix is supported
EXPECT_THROW(Element::fromJSON("\\U0020"), JSONError);
EXPECT_THROW(Element::fromJSON("\\u002"), JSONError);
EXPECT_THROW(Element::fromJSON("\\u0123"), JSONError);
EXPECT_THROW(Element::fromJSON("\\u1023"), JSONError);
EXPECT_THROW(Element::fromJSON("\\u00ag"), JSONError);
EXPECT_THROW(Element::fromJSON("\\u00ga"), JSONError);
EXPECT_THROW(Element::fromJSON("\\u00BH"), JSONError);
EXPECT_THROW(Element::fromJSON("\\u00HB"), JSONError);
// Inside strings is OK
EXPECT_NO_THROW(Element::fromJSON("\"\\\"\\\"\""));
// A whitespace test
@ -565,6 +580,19 @@ TEST(Element, escape) {
// Control characters
StringElement bell("foo\abar");
EXPECT_EQ("\"foo\\u0007bar\"", bell.str());
// 8 bit escape
StringElement ab("foo\253bar");
EXPECT_EQ("\"foo\\u00abbar\"", ab.str());
ASSERT_NO_THROW(Element::fromJSON("\"foo\\u00abbar\""));
EXPECT_TRUE(ab.equals(*Element::fromJSON("\"foo\\u00abbar\"")));
ASSERT_NO_THROW(Element::fromJSON("\"foo\\u00ABbar\""));
EXPECT_TRUE(ab.equals(*Element::fromJSON("\"foo\\u00ABbar\"")));
StringElement f1("foo\361bar");
EXPECT_EQ("\"foo\\u00f1bar\"", f1.str());
ASSERT_NO_THROW(Element::fromJSON("\"foo\\u00f1bar\""));
EXPECT_TRUE(f1.equals(*Element::fromJSON("\"foo\\u00f1bar\"")));
ASSERT_NO_THROW(Element::fromJSON("\"foo\\u00F1bar\""));
EXPECT_TRUE(f1.equals(*Element::fromJSON("\"foo\\u00F1bar\"")));
}
// This test verifies that strings are copied.