mirror of
https://github.com/oxen-io/lokinet.git
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7caa87862e
All #ifndef guards on headers have been removed, I think, in favor of #pragma once Headers are now included as `#include "filename"` if the included file resides in the same directory as the file including it, or any subdirectory therein. Otherwise they are included as `#include <project/top/dir/relative/path/filename>` The above does not include system/os headers.
141 lines
3.3 KiB
C++
141 lines
3.3 KiB
C++
#define __USE_MINGW_ANSI_STDIO 1
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#include "name.hpp"
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#include <llarp/net/net.hpp>
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#include <llarp/net/ip.hpp>
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#include <llarp/util/str.hpp>
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#include <algorithm>
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#include <sstream>
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namespace llarp
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{
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namespace dns
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{
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bool
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DecodeName(llarp_buffer_t* buf, Name_t& name, bool trimTrailingDot)
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{
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if (buf->size_left() < 1)
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return false;
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std::stringstream ss;
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size_t l;
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do
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{
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l = *buf->cur;
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buf->cur++;
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if (l)
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{
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if (buf->size_left() < l)
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return false;
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ss << Name_t((const char*)buf->cur, l);
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ss << ".";
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}
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buf->cur = buf->cur + l;
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} while (l);
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name = ss.str();
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/// trim off last dot
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if (trimTrailingDot)
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name = name.substr(0, name.find_last_of('.'));
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return true;
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}
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bool
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EncodeName(llarp_buffer_t* buf, Name_t name)
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{
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std::stringstream ss;
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if (name.size() && name[name.size() - 1] == '.')
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ss << name.substr(0, name.size() - 1);
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else
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ss << name;
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std::string part;
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while (std::getline(ss, part, '.'))
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{
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size_t l = part.length();
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if (l > 63)
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return false;
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*(buf->cur) = l;
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buf->cur++;
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if (buf->size_left() < l)
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return false;
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if (l)
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{
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memcpy(buf->cur, part.data(), l);
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buf->cur += l;
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}
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else
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break;
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}
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*buf->cur = 0;
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buf->cur++;
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return true;
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}
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bool
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DecodePTR(Name_t name, huint128_t& ip)
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{
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bool isV6 = false;
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auto pos = name.find(".in-addr.arpa");
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if (pos == std::string::npos)
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{
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pos = name.find(".ip6.arpa");
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isV6 = true;
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}
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if (pos == std::string::npos)
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return false;
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std::string sub = name.substr(0, pos + 1);
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const auto numdots = std::count(sub.begin(), sub.end(), '.');
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if (numdots == 4 && !isV6)
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{
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uint8_t a, b, c, d;
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pos = sub.find('.');
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d = atoi(sub.substr(0, pos).c_str());
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sub = sub.substr(pos + 1);
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pos = sub.find('.');
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c = atoi(sub.substr(0, pos).c_str());
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sub = sub.substr(pos + 1);
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pos = sub.find('.');
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b = atoi(sub.substr(0, pos).c_str());
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sub = sub.substr(pos + 1);
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pos = sub.find('.');
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a = atoi(sub.substr(0, pos).c_str());
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ip = net::ExpandV4(llarp::ipaddr_ipv4_bits(a, b, c, d));
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return true;
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}
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if (numdots == 32 && isV6)
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{
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size_t idx = 0;
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uint8_t lo, hi;
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auto* ptr = (uint8_t*)&ip.h;
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while (idx < 16)
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{
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pos = sub.find('.');
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lo = (*sub.substr(0, pos).c_str()) - 'a';
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sub = sub.substr(pos + 1);
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pos = sub.find('.');
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hi = (*sub.substr(0, pos).c_str()) - 'a';
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sub = sub.substr(pos + 1);
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ptr[idx] = lo | (hi << 4);
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++idx;
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}
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return true;
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}
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return false;
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}
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bool
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NameIsReserved(Name_t name)
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{
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const std::vector<std::string_view> reserved_names = {
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"snode.loki"sv, "loki.loki"sv, "snode.loki."sv, "loki.loki."sv};
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for (const auto& reserved : reserved_names)
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{
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if (ends_with(name, reserved))
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return true;
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}
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return false;
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}
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} // namespace dns
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} // namespace llarp
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