Martin Michelsen
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
#include "IPV4RangeSet.hh"
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IPV4RangeSet::IPV4RangeSet(const phosg::JSON& json) {
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for (const auto& it : json.as_list()) {
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// String should be of the form a.b.c.d or a.b.c.d/e
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auto tokens = phosg::split(it->as_string(), '/');
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size_t mask_bits;
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if (tokens.size() == 1) {
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mask_bits = 32;
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} else if (tokens.size() == 2) {
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mask_bits = stoul(tokens[1], nullptr, 10);
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if (mask_bits > 32) {
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throw std::runtime_error("invalid IPv4 address range");
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}
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} else {
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throw std::runtime_error("invalid IPv4 address range");
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}
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auto addr_tokens = phosg::split(tokens[0], '.');
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if (addr_tokens.size() != 4) {
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throw std::runtime_error("invalid IPv4 address");
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}
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uint32_t addr = 0;
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for (size_t z = 0; z < 4; z++) {
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size_t end_pos = 0;
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size_t new_byte = stoul(addr_tokens[z], &end_pos, 10);
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if (end_pos != addr_tokens[z].size() || new_byte > 0xFF) {
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throw std::runtime_error("invalid IPv4 address");
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}
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addr = (addr << 8) | new_byte;
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}
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addr &= (0xFFFFFFFF << (32 - mask_bits));
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this->ranges.emplace(addr, mask_bits);
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}
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}
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phosg::JSON IPV4RangeSet::json() const {
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auto ret = phosg::JSON::list();
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for (const auto& it : this->ranges) {
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uint32_t addr = it.first;
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uint8_t mask_bits = it.second;
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ret.emplace_back(std::format("{}.{}.{}.{}/{}",
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static_cast<uint8_t>((addr >> 24) & 0xFF),
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static_cast<uint8_t>((addr >> 16) & 0xFF),
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static_cast<uint8_t>((addr >> 8) & 0xFF),
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static_cast<uint8_t>(addr & 0xFF),
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mask_bits));
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}
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return ret;
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}
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bool IPV4RangeSet::check(uint32_t addr) const {
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auto it = this->ranges.upper_bound(addr);
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if (it == this->ranges.begin()) {
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return false; // addr is before any range
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}
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const auto& range = *(--it);
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return (((range.first ^ addr) & (0xFFFFFFFF << (32 - range.second))) == 0);
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}
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