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seed node DNS code updated to use DNSResolver

Browse source 
Also implemented rudimentary IPv6 support, but commented it out because
it's not widely supported by ISPs for now, and thus is not currently
supported by Monero.
This commit is contained in:
Thomas Winget 2014-09-17 17:25:19 -04:00 committed by Riccardo Spagni
parent 9a3b18dbc2
commit 3fb0fc020f
1 changed files with 112 additions and 42 deletions
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144
src/p2p/net_node.inl
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@ -31,10 +31,13 @@
#pragma once
#include <algorithm>
#include <arpa/inet.h>
#include <sstream>
#include "version.h"
#include "string_tools.h"
#include "common/util.h"
#include "common/dns_utils.h"
#include "net/net_helper.h"
#include "math_helper.h"
#include "p2p_protocol_defs.h"
@ -195,41 +198,108 @@ namespace nodetool
return true;
}
//-----------------------------------------------------------------------------------
inline void add_hardcoded_seed_node(
std::vector<net_address> & seed_nodes
, std::string const & addr
)
namespace
{
using namespace boost::asio;
template<typename T>
bool append_net_address(T& nodes, const std::string& addr)
{
in_addr_t bytes;
// in6_addr_t bytes6; // for IPv6 support, eventually
size_t pos = addr.find_last_of(':');
CHECK_AND_ASSERT_MES_NO_RET(std::string::npos != pos && addr.length() - 1 != pos && 0 != pos, "Failed to parse seed address from string: '" << addr << '\'');
CHECK_AND_ASSERT_MES(std::string::npos != pos && addr.length() - 1 != pos && 0 != pos, false, "Failed to parse seed address from string: '" << addr << '\'');
std::string host = addr.substr(0, pos);
std::string port = addr.substr(pos + 1);
io_service io_srv;
ip::tcp::resolver resolver(io_srv);
ip::tcp::resolver::query query(host, port);
boost::system::error_code ec;
ip::tcp::resolver::iterator i = resolver.resolve(query, ec);
CHECK_AND_ASSERT_MES_NO_RET(!ec, "Failed to resolve host name '" << host << "': " << ec.message() << ':' << ec.value());
ip::tcp::resolver::iterator iend;
for (; i != iend; ++i)
// attempt to get port number from string
std::stringstream parser(port);
uint32_t portNum;
if (parser >> portNum)
{
ip::tcp::endpoint endpoint = *i;
if (endpoint.address().is_v4())
// make sure port in valid range (could check > 1000, really)
if (portNum < 65536 && portNum > 0)
{
nodetool::net_address na;
na.ip = boost::asio::detail::socket_ops::host_to_network_long(endpoint.address().to_v4().to_ulong());
na.port = endpoint.port();
seed_nodes.push_back(na);
LOG_PRINT_L4("Added seed node: " << endpoint.address().to_v4().to_string(ec) << ':' << na.port);
return false;
}
}
else
{
LOG_PRINT_L2("IPv6 doesn't supported, skip '" << host << "' -> " << endpoint.address().to_v6().to_string(ec));
return false;
}
// attempt to get network-bytes for ipv4 address
if (inet_pton(AF_INET, host.c_str(), &bytes) != 1)
{
// if that fails, maybe it's a hostname, try to resolve
std::vector<std::string> addr_list = tools::DNSResolver::instance().get_ipv4(host);
// if hostname DNS resolution fails, return false
if (addr_list.size() == 0)
{
return false;
}
// add each resultant IP to seeds
for (const std::string& a : addr_list)
{
// could call append_net_address recursively here to avoid code repeat
if (inet_pton(AF_INET, a.c_str(), &bytes) == 1)
{
nodetool::net_address na;
na.ip = bytes;
na.port = portNum;
nodes.push_back(na);
}
}
}
// if conversion was success (passed string was IP address, not hostname),
// add IP to seeds
else
{
nodetool::net_address na;
na.ip = bytes;
na.port = portNum;
nodes.push_back(na);
}
/* same as above, but for ipv6. Use when the time comes.
// attempt to get network-bytes for ipv6 address
if (inet_pton(AF_INET6, host.c_str(), &bytes6) != 1)
{
// if that fails, maybe it's a hostname, try to resolve
std::vector<std::string> addr_list = tools::DNSResolver::instance().get_ipv6(host);
// if hostname DNS resolution fails, return false
if (addr_list.size() == 0)
{
return false;
}
// add each resultant IP to seeds
for (const std::string& a : addr_list)
{
// could call append_net_address recursively here to avoid code repeat
if (inet_pton(AF_INET6, a.c_str(), &bytes6) == 1)
{
nodetool::net_address6 na;
na.ip = bytes6;
na.port = portNum;
nodes.push_back(na);
}
}
}
// if conversion was success (passed string was IP address, not hostname),
// add IP to seeds
else
{
nodetool::net_address6 na;
na.ip = bytes6;
na.port = portNum;
nodes.push_back(na);
}
*/
return true;
}
}
@ -239,9 +309,9 @@ namespace nodetool
{
if (testnet)
{
add_hardcoded_seed_node(m_seed_nodes, "107.152.187.202:28080");
add_hardcoded_seed_node(m_seed_nodes, "197.242.158.240:28080");
add_hardcoded_seed_node(m_seed_nodes, "107.152.130.98:28080");
append_net_address(m_seed_nodes, "107.152.187.202:28080");
append_net_address(m_seed_nodes, "197.242.158.240:28080");
append_net_address(m_seed_nodes, "107.152.130.98:28080");
}
else
{
@ -260,17 +330,17 @@ namespace nodetool
if (!m_seed_nodes.size())
{
add_hardcoded_seed_node(m_seed_nodes, "62.210.78.186:18080");
add_hardcoded_seed_node(m_seed_nodes, "195.12.60.154:18080");
add_hardcoded_seed_node(m_seed_nodes, "54.241.246.125:18080");
add_hardcoded_seed_node(m_seed_nodes, "107.170.157.169:18080");
add_hardcoded_seed_node(m_seed_nodes, "54.207.112.216:18080");
add_hardcoded_seed_node(m_seed_nodes, "78.27.112.54:18080");
add_hardcoded_seed_node(m_seed_nodes, "209.222.30.57:18080");
add_hardcoded_seed_node(m_seed_nodes, "80.71.13.55:18080");
add_hardcoded_seed_node(m_seed_nodes, "107.178.112.126:18080");
add_hardcoded_seed_node(m_seed_nodes, "107.158.233.98:18080");
add_hardcoded_seed_node(m_seed_nodes, "64.22.111.2:18080");
append_net_address(m_seed_nodes, "62.210.78.186:18080");
append_net_address(m_seed_nodes, "195.12.60.154:18080");
append_net_address(m_seed_nodes, "54.241.246.125:18080");
append_net_address(m_seed_nodes, "107.170.157.169:18080");
append_net_address(m_seed_nodes, "54.207.112.216:18080");
append_net_address(m_seed_nodes, "78.27.112.54:18080");
append_net_address(m_seed_nodes, "209.222.30.57:18080");
append_net_address(m_seed_nodes, "80.71.13.55:18080");
append_net_address(m_seed_nodes, "107.178.112.126:18080");
append_net_address(m_seed_nodes, "107.158.233.98:18080");
append_net_address(m_seed_nodes, "64.22.111.2:18080");
}
}