mirror of https://github.com/oxen-io/lokinet
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
108 lines
2.5 KiB
C++
108 lines
2.5 KiB
C++
#define __USE_MINGW_ANSI_STDIO 1
|
|
#include <dns/name.hpp>
|
|
#include <net/net.hpp>
|
|
|
|
#include <algorithm>
|
|
#include <sstream>
|
|
|
|
namespace llarp
|
|
{
|
|
namespace dns
|
|
{
|
|
bool
|
|
DecodeName(llarp_buffer_t* buf, Name_t& name, bool trimTrailingDot)
|
|
{
|
|
if(buf->size_left() < 1)
|
|
return false;
|
|
std::stringstream ss;
|
|
size_t l;
|
|
do
|
|
{
|
|
l = *buf->cur;
|
|
buf->cur++;
|
|
if(l)
|
|
{
|
|
if(l > 63)
|
|
{
|
|
llarp::LogError("decode name failed, field too big: ", l, " > 63");
|
|
llarp::DumpBuffer(*buf);
|
|
return false;
|
|
}
|
|
if(buf->size_left() < l)
|
|
return false;
|
|
|
|
ss << Name_t((const char*)buf->cur, l);
|
|
ss << ".";
|
|
}
|
|
buf->cur = buf->cur + l;
|
|
} while(l);
|
|
name = ss.str();
|
|
/// trim off last dot
|
|
if(trimTrailingDot)
|
|
name = name.substr(0, name.find_last_of('.'));
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
EncodeName(llarp_buffer_t* buf, const Name_t& name)
|
|
{
|
|
std::stringstream ss;
|
|
if(name.size() && name[name.size() - 1] == '.')
|
|
ss << name.substr(0, name.size() - 1);
|
|
else
|
|
ss << name;
|
|
|
|
std::string part;
|
|
while(std::getline(ss, part, '.'))
|
|
{
|
|
size_t l = part.length();
|
|
if(l > 63)
|
|
return false;
|
|
*(buf->cur) = l;
|
|
buf->cur++;
|
|
if(buf->size_left() < l)
|
|
return false;
|
|
if(l)
|
|
{
|
|
memcpy(buf->cur, part.data(), l);
|
|
buf->cur += l;
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
*buf->cur = 0;
|
|
buf->cur++;
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
DecodePTR(const Name_t& name, huint32_t& ip)
|
|
{
|
|
auto pos = name.find(".in-addr.arpa");
|
|
if(pos == std::string::npos)
|
|
return false;
|
|
std::string sub = name.substr(0, pos + 1);
|
|
if(std::count(sub.begin(), sub.end(), '.') == 4)
|
|
{
|
|
uint8_t a, b, c, d;
|
|
pos = sub.find('.');
|
|
d = atoi(sub.substr(0, pos).c_str());
|
|
sub = sub.substr(pos + 1);
|
|
pos = sub.find('.');
|
|
c = atoi(sub.substr(0, pos).c_str());
|
|
sub = sub.substr(pos + 1);
|
|
pos = sub.find('.');
|
|
b = atoi(sub.substr(0, pos).c_str());
|
|
sub = sub.substr(pos + 1);
|
|
pos = sub.find('.');
|
|
a = atoi(sub.substr(0, pos).c_str());
|
|
ip = llarp::ipaddr_ipv4_bits(a, b, c, d);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
} // namespace dns
|
|
} // namespace llarp
|