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// Copyright (C) 2011 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
#include "character_string.h"
#include "rdata.h"
using namespace std;
using namespace isc::dns::rdata;
namespace isc {
namespace dns {
namespace {
bool isDigit(char c) {
return (('0' <= c) && (c <= '9'));
}
}
std::string
characterstr::getNextCharacterString(const std::string& input_str,
std::string::const_iterator& input_iterator)
{
string result;
// If the input string only contains white-spaces, it is an invalid
// <character-string>
if (input_iterator >= input_str.end()) {
isc_throw(InvalidRdataText, "Invalid text format, \
<character-string> field is missing.");
}
// Whether the <character-string> is separated with double quotes (")
bool quotes_separated = (*input_iterator == '"');
// Whether the quotes are pared if the string is quotes separated
bool quotes_paired = false;
if (quotes_separated) {
++input_iterator;
}
while(input_iterator < input_str.end()){
// Escaped characters processing
if (*input_iterator == '\\') {
if (input_iterator + 1 == input_str.end()) {
isc_throw(InvalidRdataText, "<character-string> ended \
prematurely.");
} else {
if (isDigit(*(input_iterator + 1))) {
// \DDD where each D is a digit. It its the octet
// corresponding to the decimal number described by DDD
if (input_iterator + 3 >= input_str.end()) {
isc_throw(InvalidRdataText, "<character-string> ended \
prematurely.");
} else {
int n = 0;
++input_iterator;
for (int i = 0; i < 3; ++i) {
if (isDigit(*input_iterator)) {
n = n*10 + (*input_iterator - '0');
++input_iterator;
} else {
isc_throw(InvalidRdataText, "Illegal decimal \
escaping series");
}
}
if (n > 255) {
isc_throw(InvalidRdataText, "Illegal octet \
number");
}
result.push_back(n);
continue;
}
} else {
++input_iterator;
result.push_back(*input_iterator);
++input_iterator;
continue;
}
}
}
if (quotes_separated) {
// If the <character-string> is seperated with quotes symbol and
// another quotes symbol is encountered, it is the end of the
// <character-string>
if (*input_iterator == '"') {
quotes_paired = true;
++input_iterator;
// Reach the end of character string
break;
}
} else if (*input_iterator == ' ') {
// If the <character-string> is not seperated with quotes symbol,
// it is seperated with <space> char
break;
}
result.push_back(*input_iterator);
++input_iterator;
}
if (result.size() > MAX_CHARSTRING_LEN) {
isc_throw(CharStringTooLong, "<character-string> is too long");
}
if (quotes_separated && !quotes_paired) {
isc_throw(InvalidRdataText, "The quotes are not paired");
}
return (result);
}
std::string
characterstr::getNextCharacterString(util::InputBuffer& buffer, size_t len) {
uint8_t str_len = buffer.readUint8();
size_t pos = buffer.getPosition();
if (len - pos < str_len) {
isc_throw(InvalidRdataLength, "Invalid string length");
}
uint8_t buf[MAX_CHARSTRING_LEN];
buffer.readData(buf, str_len);
return (string(buf, buf + str_len));
}
} // end of namespace dns
} // end of namespace isc
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