/* Copyright (c) 2012, Arvid Norberg All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "libtorrent/peer_list.hpp" #include "libtorrent/hasher.hpp" #include "libtorrent/broadcast_socket.hpp" // for supports_ipv6() #include "setup_transfer.hpp" #include #include "test.hpp" using namespace libtorrent; std::uint32_t hash_buffer(char const* buf, int len) { boost::crc_optimal<32, 0x1EDC6F41, 0xFFFFFFFF, 0xFFFFFFFF, true, true> crc; crc.process_block(buf, buf + len); return crc.checksum(); } TORRENT_TEST(peer_priority) { // when the IP is the same, we hash the ports, sorted std::uint32_t p = peer_priority( ep("230.12.123.3", 0x4d2), ep("230.12.123.3", 0x12c)); TEST_EQUAL(p, hash_buffer("\x01\x2c\x04\xd2", 4)); // when we're in the same /24, we just hash the IPs p = peer_priority(ep("230.12.123.1", 0x4d2), ep("230.12.123.3", 0x12c)); TEST_EQUAL(p, hash_buffer("\xe6\x0c\x7b\x01\xe6\x0c\x7b\x03", 8)); // when we're in the same /16, we just hash the IPs masked by // 0xffffff55 p = peer_priority(ep("230.12.23.1", 0x4d2), ep("230.12.123.3", 0x12c)); TEST_EQUAL(p, hash_buffer("\xe6\x0c\x17\x01\xe6\x0c\x7b\x01", 8)); // when we're in different /16, we just hash the IPs masked by // 0xffff5555 p = peer_priority(ep("230.120.23.1", 0x4d2), ep("230.12.123.3", 0x12c)); TEST_EQUAL(p, hash_buffer("\xe6\x0c\x51\x01\xe6\x78\x15\x01", 8)); // test vectors from BEP 40 TEST_EQUAL(peer_priority(ep("123.213.32.10", 0), ep("98.76.54.32", 0)) , 0xec2d7224); TEST_EQUAL(peer_priority( ep("123.213.32.10", 0), ep("123.213.32.234", 0)) , 0x99568189); if (supports_ipv6()) { // IPv6 has a twice as wide mask, and we only care about the top 64 bits // when the IPs are the same, just hash the ports p = peer_priority( ep("ffff:ffff:ffff:ffff::1", 0x4d2), ep("ffff:ffff:ffff:ffff::1", 0x12c)); TEST_EQUAL(p, hash_buffer("\x01\x2c\x04\xd2", 4)); // these IPs don't belong to the same /32, so apply the full mask // 0xffffffff55555555 p = peer_priority( ep("ffff:ffff:ffff:ffff::1", 0x4d2), ep("ffff:0fff:ffff:ffff::1", 0x12c)); TEST_EQUAL(p, hash_buffer( "\xff\xff\x0f\xff\x55\x55\x55\x55\x00\x00\x00\x00\x00\x00\x00\x01" "\xff\xff\xff\xff\x55\x55\x55\x55\x00\x00\x00\x00\x00\x00\x00\x01", 32)); } }