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made peer connection order depend on ones external IP or be random (if we don't know our external IP). Should fix #281

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This commit is contained in:
Arvid Norberg
2008-02-28 03:09:34 +00:00
parent 60add53428
commit cf5c9344ab
6 changed files with 112 additions and 11 deletions
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38
src/broadcast_socket.cpp
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@@ -99,6 +99,44 @@ namespace libtorrent
return ret;
}
// count the length of the common bit prefix
int common_bits(unsigned char const* b1
, unsigned char const* b2, int n)
{
for (int i = 0; i < n; ++i, ++b1, ++b2)
{
unsigned char a = *b1 ^ *b2;
if (a == 0) continue;
int ret = i * 8 + 8;
for (; a > 0; a >>= 1) --ret;
return ret;
}
return n * 8;
}
// returns the number of bits in that differ from the right
// between the addresses.
int cidr_distance(address const& a1, address const& a2)
{
if (a1.is_v4() == a2.is_v4())
{
// both are v4
address_v4::bytes_type b1 = a1.to_v4().to_bytes();
address_v4::bytes_type b2 = a2.to_v4().to_bytes();
return address_v4::bytes_type::static_size * 8
- common_bits(b1.c_array(), b2.c_array(), b1.size());
}
address_v6::bytes_type b1;
address_v6::bytes_type b2;
if (a1.is_v4()) b1 = address_v6::v4_mapped(a1.to_v4()).to_bytes();
else b1 = a1.to_v6().to_bytes();
if (a2.is_v4()) b2 = address_v6::v4_mapped(a2.to_v4()).to_bytes();
else b2 = a2.to_v6().to_bytes();
return address_v6::bytes_type::static_size * 8
- common_bits(b1.c_array(), b2.c_array(), b1.size());
}
broadcast_socket::broadcast_socket(asio::io_service& ios
, udp::endpoint const& multicast_endpoint
, receive_handler_t const& handler