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p2p: fix exclusive node DNS resolution for certain hosts

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Fixes #8633. The function `append_net_address` did not parse hostname + port addresses (e.g. `bar:29080`) correctly if the hostname did not contain a `'.'` character.

@vtnerd comments 1

clear up 2nd conditional statement
This commit is contained in:
Jeffrey Ryan 2022-11-16 15:53:15 -06:00
parent 365fd45b03
commit faaf2af43b
4 changed files with 55 additions and 14 deletions
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8
src/net/parse.cpp
View file

@ -38,7 +38,7 @@ namespace net
{
void get_network_address_host_and_port(const std::string& address, std::string& host, std::string& port)
{
// require ipv6 address format "[addr:addr:addr:...:addr]:port"
// If IPv6 address format with port "[addr:addr:addr:...:addr]:port"
if (address.find(']') != std::string::npos)
{
host = address.substr(1, address.rfind(']') - 1);
@ -47,6 +47,12 @@ namespace net
port = address.substr(address.rfind(':') + 1);
}
}
// Else if IPv6 address format without port e.g. "addr:addr:addr:...:addr"
else if (std::count(address.begin(), address.end(), ':') >= 2)
{
host = address;
}
// Else IPv4, Tor, I2P address or hostname
else
{
host = address.substr(0, address.rfind(':'));

10
src/net/parse.h
View file

@ -38,6 +38,16 @@
namespace net
{
/*!
* \brief Takes a valid address string (IP, Tor, I2P, or DNS name) and splits it into host and port
*
* The host of an IPv6 addresses in the format "[x:x:..:x]:port" will have the braces stripped.
* For example, when the address is "[ffff::2023]", host will be set to "ffff::2023".
*
* \param address The address string one wants to split
* \param[out] host The host part of the address string. Is always set.
* \param[out] port The port part of the address string. Is only set when address string contains a port.
*/
void get_network_address_host_and_port(const std::string& address, std::string& host, std::string& port);
/*!

14
src/p2p/net_node.inl
View file

@ -645,20 +645,10 @@ namespace nodetool
{
using namespace boost::asio;
std::string host = addr;
// Split addr string into host string and port string
std::string host;
std::string port = std::to_string(default_port);
size_t colon_pos = addr.find_last_of(':');
size_t dot_pos = addr.find_last_of('.');
size_t square_brace_pos = addr.find('[');
// IPv6 will have colons regardless. IPv6 and IPv4 address:port will have a colon but also either a . or a [
// as IPv6 addresses specified as address:port are to be specified as "[addr:addr:...:addr]:port"
// One may also specify an IPv6 address as simply "[addr:addr:...:addr]" without the port; in that case
// the square braces will be stripped here.
if ((std::string::npos != colon_pos && std::string::npos != dot_pos) || std::string::npos != square_brace_pos)
{
net::get_network_address_host_and_port(addr, host, port);
}
MINFO("Resolving node address: host=" << host << ", port=" << port);
io_service io_srv;

35
tests/unit_tests/net.cpp
View file

@ -936,6 +936,41 @@ TEST(get_network_address, ipv4subnet)
EXPECT_STREQ("12.34.0.0/16", address->str().c_str());
}
namespace
{
void na_host_and_port_test(std::string addr, std::string exp_host, std::string exp_port)
{
std::string host{"xxxxx"};
std::string port{"xxxxx"};
net::get_network_address_host_and_port(addr, host, port);
EXPECT_EQ(exp_host, host);
EXPECT_EQ(exp_port, port);
}
} // anonymous namespace
TEST(get_network_address_host_and_port, ipv4)
{
na_host_and_port_test("9.9.9.9", "9.9.9.9", "xxxxx");
na_host_and_port_test("9.9.9.9:18081", "9.9.9.9", "18081");
}
TEST(get_network_address_host_and_port, ipv6)
{
na_host_and_port_test("::ffff", "::ffff", "xxxxx");
na_host_and_port_test("[::ffff]", "::ffff", "xxxxx");
na_host_and_port_test("[::ffff]:00231", "::ffff", "00231");
na_host_and_port_test("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff", "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff", "xxxxx");
na_host_and_port_test("[7777:7777:7777:7777:7777:7777:7777:7777]", "7777:7777:7777:7777:7777:7777:7777:7777", "xxxxx");
na_host_and_port_test("[7777:7777:7777:7777:7777:7777:7777:7777]:48080", "7777:7777:7777:7777:7777:7777:7777:7777", "48080");
}
TEST(get_network_address_host_and_port, hostname)
{
na_host_and_port_test("localhost", "localhost", "xxxxx");
na_host_and_port_test("bar:29080", "bar", "29080"); // Issue https://github.com/monero-project/monero/issues/8633
na_host_and_port_test("xmrchain.net:18081", "xmrchain.net", "18081");
}
namespace
{
using stream_type = boost::asio::ip::tcp;