ZeroTierOne/node/Dictionary.cpp

/*
 * Copyright (c)2013-2020 ZeroTier, Inc.
 *
 * Use of this software is governed by the Business Source License included
 * in the LICENSE.TXT file in the project's root directory.
 *
 * Change Date: 2024-01-01
 *
 * On the date above, in accordance with the Business Source License, use
 * of this software will be governed by version 2.0 of the Apache License.
 */
/****/

#include "Dictionary.hpp"

namespace ZeroTier {

Dictionary::Dictionary()
{
}

Vector<uint8_t> &Dictionary::operator[](const char *k)
{
	return m_entries[s_toKey(k)];
}

const Vector<uint8_t> &Dictionary::operator[](const char *k) const
{
	static const Vector<uint8_t> s_emptyEntry;
	Map< uint64_t,Vector<uint8_t> >::const_iterator e(m_entries.find(s_toKey(k)));
	return (e == m_entries.end()) ? s_emptyEntry : e->second;
}

void Dictionary::add(const char *k,bool v)
{
	Vector<uint8_t> &e = (*this)[k];
	e.resize(2);
	e[0] = (uint8_t)(v ? '1' : '0');
	e[1] = 0;
}

void Dictionary::add(const char *k,const Address &v)
{
	Vector<uint8_t> &e = (*this)[k];
	e.resize(ZT_ADDRESS_STRING_SIZE_MAX);
	v.toString((char *)e.data());
}

void Dictionary::add(const char *k,const char *v)
{
	if ((v)&&(*v)) {
		Vector<uint8_t> &e = (*this)[k];
		e.clear();
		while (*v)
			e.push_back((uint8_t)*(v++));
	}
}

void Dictionary::add(const char *k,const void *data,unsigned int len)
{
	Vector<uint8_t> &e = (*this)[k];
	if (len != 0) {
		e.assign((const uint8_t *)data,(const uint8_t *)data + len);
	} else {
		e.clear();
	}
}

bool Dictionary::getB(const char *k,bool dfl) const
{
	const Vector<uint8_t> &e = (*this)[k];
	if (!e.empty()) {
		switch ((char)e[0]) {
			case '1':
			case 't':
			case 'T':
			case 'y':
			case 'Y':
				return true;
			default:
				return false;
		}
	}
	return dfl;
}

uint64_t Dictionary::getUI(const char *k,uint64_t dfl) const
{
	uint8_t tmp[18];
	uint64_t v = dfl;
	const Vector<uint8_t> &e = (*this)[k];
	if (!e.empty()) {
		if (e.back() != 0) {
			const unsigned long sl = e.size();
			Utils::copy(tmp,e.data(),(sl > 17) ? 17 : sl);
			tmp[17] = 0;
			return Utils::unhex((const char *)tmp);
		}
		return Utils::unhex((const char *)e.data());
	}
	return v;
}

void Dictionary::getS(const char *k,char *v,const unsigned int cap) const
{
	if (cap == 0) // sanity check
		return;
	const Vector<uint8_t> &e = (*this)[k];
	unsigned int i = 0;
	const unsigned int last = cap - 1;
	for(;;) {
		if ((i == last)||(i >= (unsigned int)e.size()))
			break;
		v[i] = (char)e[i];
		++i;
	}
	v[i] = 0;
}

void Dictionary::clear()
{
	m_entries.clear();
}

void Dictionary::encode(Vector<uint8_t> &out) const
{
	uint64_t str[2] = { 0,0 }; // second uint64_t being 0 means all strings always 0-terminated
	out.clear();
	for(Map< uint64_t,Vector<uint8_t> >::const_iterator ti(m_entries.begin());ti != m_entries.end();++ti) {
		str[0] = ti->first;
		s_appendKey(out,reinterpret_cast<const char *>(str));
		for(Vector<uint8_t>::const_iterator i(ti->second.begin());i!=ti->second.end();++i)
			s_appendValueByte(out,*i);
		out.push_back((uint8_t)'\n');
	}
}

bool Dictionary::decode(const void *data,unsigned int len)
{
	clear();

	uint64_t k = 0;
	unsigned int ki = 0;
	Vector<uint8_t> *v = nullptr;
	bool escape = false;
	for(unsigned int di=0;di<len;++di) {
		uint8_t c = reinterpret_cast<const uint8_t *>(data)[di];
		if (!c) break;
		if (v) {
			if (escape) {
				escape = false;
				switch(c) {
					case 48:
						v->push_back(0);
						break;
					case 101:
						v->push_back(61);
						break;
					case 110:
						v->push_back(10);
						break;
					case 114:
						v->push_back(13);
						break;
					default:
						v->push_back(c);
						break;
				}
			} else {
				if (c == (uint8_t)'\n') {
					k = 0;
					ki = 0;
					v = nullptr;
				} else if (c == 92) { // backslash
					escape = true;
				} else {
					v->push_back(c);
				}
			}
		} else {
			if ((c < 33)||(c > 126)||(c == 92)) {
				return false;
			} else if (c == (uint8_t)'=') {
				v = &m_entries[k];
			} else {
				reinterpret_cast<uint8_t *>(&k)[ki & 7U] ^= c;
			}
		}
	}

	return true;
}

} // namespace ZeroTier