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create unique loopback address for ipv6

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orignal
2025-08-26 21:16:15 -04:00
parent a2073a8751
commit 310ee78d24
1 changed files with 27 additions and 8 deletions
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35
libi2pd_client/I2PTunnel.cpp
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@@ -81,14 +81,26 @@ namespace client
return ourIP;
}
boost::asio::ip::address GetLoopbackAddress6For(const i2p::data::IdentHash & addr)
{
boost::asio::ip::address_v6::bytes_type bytes;
const uint8_t * ident = addr;
bytes[0] = 0xfd;
memcpy (bytes.data ()+1, ident, 15);
boost::asio::ip::address ourIP = boost::asio::ip::address_v6 (bytes);
return ourIP;
}
#ifdef __linux__
static void MapToLoopback(std::shared_ptr<boost::asio::ip::tcp::socket> sock, const i2p::data::IdentHash & addr)
static void MapToLoopback(std::shared_ptr<boost::asio::ip::tcp::socket> sock, const i2p::data::IdentHash & addr, bool isV4)
{
if (sock)
{
// bind to 127.x.x.x address
// bind to 127.x.x.x address for ipv4
// where x.x.x are first three bytes from ident
auto ourIP = GetLoopbackAddressFor(addr);
// bind to fdxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx address for ipv6
// where xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx are first 15 bytes from ident
auto ourIP = isV4 ? GetLoopbackAddressFor(addr) : GetLoopbackAddress6For(addr);
boost::system::error_code ec;
sock->bind (boost::asio::ip::tcp::endpoint (ourIP, 0), ec);
if (ec)
@@ -103,12 +115,19 @@ namespace client
{
I2PTunnelSetSocketOptions (m_Socket);
#ifdef __linux__
if (isUniqueLocal && m_RemoteEndpoint.address ().is_v4 () &&
m_RemoteEndpoint.address ().to_v4 ().to_bytes ()[0] == 127)
{
m_Socket->open (boost::asio::ip::tcp::v4 ());
if (isUniqueLocal && m_RemoteEndpoint.address ().is_loopback ())
{
auto ident = m_Stream->GetRemoteIdentity()->GetIdentHash();
MapToLoopback(m_Socket, ident);
if (m_RemoteEndpoint.address ().is_v4 ())
{
m_Socket->open (boost::asio::ip::tcp::v4 ());
MapToLoopback(m_Socket, ident, true);
}
else if (m_RemoteEndpoint.address ().is_v6 ())
{
m_Socket->open (boost::asio::ip::tcp::v6 ());
MapToLoopback(m_Socket, ident, false);
}
}
#endif
m_Socket->async_connect (m_RemoteEndpoint, std::bind (&I2PTunnelConnection::HandleConnect,