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264 | // Copyright (C) 2012-2024 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <exceptions/exceptions.h>
#include <dns/exceptions.h>
#include <dns/rdata.h>
#include <dns/master_lexer.h>
#include <dns/char_string.h>
#include <util/buffer.h>
#include <boost/lexical_cast.hpp><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <cctype><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <cstring><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <vector><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
#include <stdint.h><--- Include file: not found. Please note: Cppcheck does not need standard library headers to get proper results.
namespace isc {
namespace dns {
namespace rdata {
namespace generic {
namespace detail {
namespace {
// Convert a DDD form to the corresponding integer
int
decimalToNumber(const char* s, const char* s_end) {
if (s_end - s < 3) {
isc_throw(InvalidRdataText, "Escaped digits too short");
}
const std::string num_str(s, s + 3);
try {
const int i = boost::lexical_cast<int>(num_str);
if (i > 255) {
isc_throw(InvalidRdataText, "Escaped digits too large: "
<< num_str);
}
return (i);
} catch (const boost::bad_lexical_cast&) {
isc_throw(InvalidRdataText,
"Invalid form for escaped digits: " << num_str);
}
}
}
void
stringToCharString(const MasterToken::StringRegion& str_region,
CharString& result) {
// make a space for the 1-byte length field; filled in at the end
result.push_back(0);
bool escape = false;
const char* s = str_region.beg;
const char* const s_end = str_region.beg + str_region.len;
for (size_t n = str_region.len; n != 0; --n, ++s) {
int c = (*s & 0xff);
if (escape && std::isdigit(c) != 0) {
c = decimalToNumber(s, s_end);
// decimalToNumber() already throws if (s_end - s) is less
// than 3. 'n' is an unsigned type (size_t) and can underflow.
// 'n' and 's' are also updated by 1 in the for statement's
// expression, so we update them by 2 instead of 3 here.
n -= 2;
s += 2;
} else if (!escape && c == '\\') {
escape = true;
continue;
}
escape = false;
result.push_back(c);
}
if (escape) { // terminated by non-escaped '\'
isc_throw(InvalidRdataText, "character-string ends with '\\'");
}
if (result.size() > MAX_CHARSTRING_LEN + 1) { // '+ 1' due to the len field
isc_throw(CharStringTooLong, "character-string is too long: " <<
(result.size() - 1) << "(+1) characters");
}
result[0] = result.size() - 1;
}
void
stringToCharStringData(const MasterToken::StringRegion& str_region,
CharStringData& result) {
bool escape = false;
const char* s = str_region.beg;
const char* const s_end = str_region.beg + str_region.len;
for (size_t n = str_region.len; n != 0; --n, ++s) {
int c = (*s & 0xff);
if (escape && std::isdigit(c) != 0) {
c = decimalToNumber(s, s_end);
// decimalToNumber() already throws if (s_end - s) is less
// than 3. 'n' is an unsigned type (size_t) and can underflow.
// 'n' and 's' are also updated by 1 in the for statement's
// expression, so we update them by 2 instead of 3 here.
n -= 2;
s += 2;
} else if (!escape && c == '\\') {
escape = true;
continue;
}
escape = false;
result.push_back(c);
}
if (escape) { // terminated by non-escaped '\'
isc_throw(InvalidRdataText, "character-string ends with '\\'");
}
}
std::string
charStringToString(const CharString& char_string) {
std::string s;
bool first = true;
for (auto const& it : char_string) {
if (first) {
first = false;
continue;
}
const uint8_t ch = it;
if ((ch < 0x20) || (ch >= 0x7f)) {
// convert to escaped \xxx (decimal) format
s.push_back('\\');
s.push_back('0' + ((ch / 100) % 10));
s.push_back('0' + ((ch / 10) % 10));
s.push_back('0' + (ch % 10));
continue;
}
if ((ch == '"') || (ch == ';') || (ch == '\\')) {
s.push_back('\\');
}
s.push_back(ch);
}
return (s);
}
std::string
charStringDataToString(const CharStringData& char_string) {
std::string s;
for (auto const& it : char_string) {
const uint8_t ch = it;
if ((ch < 0x20) || (ch >= 0x7f)) {
// convert to escaped \xxx (decimal) format
s.push_back('\\');
s.push_back('0' + ((ch / 100) % 10));
s.push_back('0' + ((ch / 10) % 10));
s.push_back('0' + (ch % 10));
continue;
}
if ((ch == '"') || (ch == ';') || (ch == '\\')) {
s.push_back('\\');
}
s.push_back(ch);
}
return (s);
}
int compareCharStrings(const detail::CharString& self,
const detail::CharString& other) {
if (self.size() == 0 && other.size() == 0) {
return (0);
}
if (self.size() == 0) {
return (-1);
}
if (other.size() == 0) {
return (1);
}
const size_t self_len = self[0];
const size_t other_len = other[0];
const size_t cmp_len = std::min(self_len, other_len);
if (cmp_len == 0) {
if (self_len < other_len) {
return (-1);
} else if (self_len > other_len) {
return (1);
} else {
return (0);
}
}
const int cmp = std::memcmp(&self[1], &other[1], cmp_len);
if (cmp < 0) {
return (-1);
} else if (cmp > 0) {
return (1);
} else if (self_len < other_len) {
return (-1);
} else if (self_len > other_len) {
return (1);
} else {
return (0);
}
}
int compareCharStringDatas(const detail::CharStringData& self,
const detail::CharStringData& other) {
if (self.size() == 0 && other.size() == 0) {
return (0);
}
if (self.size() == 0) {
return (-1);
}
if (other.size() == 0) {
return (1);
}
const size_t self_len = self.size();
const size_t other_len = other.size();
const size_t cmp_len = std::min(self_len, other_len);
const int cmp = std::memcmp(&self[0], &other[0], cmp_len);
if (cmp < 0) {
return (-1);
} else if (cmp > 0) {
return (1);
} else if (self_len < other_len) {
return (-1);
} else if (self_len > other_len) {
return (1);
} else {
return (0);
}
}
size_t
bufferToCharString(isc::util::InputBuffer& buffer, size_t rdata_len,
CharString& target) {
if (rdata_len < 1 || buffer.getLength() - buffer.getPosition() < 1) {
isc_throw(isc::dns::DNSMessageFORMERR,
"insufficient data to read character-string length");
}
const uint8_t len = buffer.readUint8();
if (rdata_len < len + 1) {
isc_throw(isc::dns::DNSMessageFORMERR,
"character string length is too large: " <<
static_cast<int>(len));
}
if (buffer.getLength() - buffer.getPosition() < len) {
isc_throw(isc::dns::DNSMessageFORMERR,
"not enough data in buffer to read character-string of len"
<< static_cast<int>(len));
}
target.resize(len + 1);
target[0] = len;
buffer.readData(&target[0] + 1, len);
return (len + 1);
}
} // end of detail
} // end of generic
} // end of rdata
} // end of dns
} // end of isc
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