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dns: change default DNS to a worldwide selection

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DNSSEC aware servers picked from https://wiki.ipfire.org/dns/public-servers
This commit is contained in:
moneromooo-monero 2018-02-02 12:40:44 +00:00
parent ed67e5c001
commit 71806327f5
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GPG key ID: 686F07454D6CEFC3
3 changed files with 35 additions and 23 deletions
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28
src/common/dns_utils.cpp
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@ -36,13 +36,21 @@
#include <boost/filesystem/fstream.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/thread.hpp>
#include <boost/algorithm/string/join.hpp>
using namespace epee;
namespace bf = boost::filesystem;
#undef MONERO_DEFAULT_LOG_CATEGORY
#define MONERO_DEFAULT_LOG_CATEGORY "net.dns"
#define DEFAULT_DNS_PUBLIC_ADDR "8.8.4.4"
static const char *DEFAULT_DNS_PUBLIC_ADDR[] =
{
"194.150.168.168", // CCC (Germany)
"81.3.27.54", // Lightning Wire Labs (Germany)
"31.3.135.232", // OpenNIC (Switzerland)
"80.67.169.40", // FDN (France)
"209.58.179.186", // Cyberghost (Singapore)
};
static boost::mutex instance_lock;
@ -201,13 +209,13 @@ public:
DNSResolver::DNSResolver() : m_data(new DNSResolverData())
{
int use_dns_public = 0;
std::string dns_public_addr = DEFAULT_DNS_PUBLIC_ADDR;
std::vector<std::string> dns_public_addr;
if (auto res = getenv("DNS_PUBLIC"))
{
dns_public_addr = tools::dns_utils::parse_dns_public(res);
if (!dns_public_addr.empty())
{
MGINFO("Using public DNS server: " << dns_public_addr << " (TCP)");
MGINFO("Using public DNS server(s): " << boost::join(dns_public_addr, ", ") << " (TCP)");
use_dns_public = 1;
}
else
@ -221,7 +229,8 @@ DNSResolver::DNSResolver() : m_data(new DNSResolverData())
if (use_dns_public)
{
ub_ctx_set_fwd(m_data->m_ub_context, dns_public_addr.c_str());
for (const auto &ip: dns_public_addr)
ub_ctx_set_fwd(m_data->m_ub_context, ip.c_str());
ub_ctx_set_option(m_data->m_ub_context, string_copy("do-udp:"), string_copy("no"));
ub_ctx_set_option(m_data->m_ub_context, string_copy("do-tcp:"), string_copy("yes"));
}
@ -526,15 +535,16 @@ bool load_txt_records_from_dns(std::vector<std::string> &good_records, const std
return true;
}
std::string parse_dns_public(const char *s)
std::vector<std::string> parse_dns_public(const char *s)
{
unsigned ip0, ip1, ip2, ip3;
char c;
std::string dns_public_addr;
std::vector<std::string> dns_public_addr;
if (!strcmp(s, "tcp"))
{
dns_public_addr = DEFAULT_DNS_PUBLIC_ADDR;
LOG_PRINT_L0("Using default public DNS server: " << dns_public_addr << " (TCP)");
for (size_t i = 0; i < sizeof(DEFAULT_DNS_PUBLIC_ADDR) / sizeof(DEFAULT_DNS_PUBLIC_ADDR[0]); ++i)
dns_public_addr.push_back(DEFAULT_DNS_PUBLIC_ADDR[i]);
LOG_PRINT_L0("Using default public DNS server(s): " << boost::join(dns_public_addr, ", ") << " (TCP)");
}
else if (sscanf(s, "tcp://%u.%u.%u.%u%c", &ip0, &ip1, &ip2, &ip3, &c) == 4)
{
@ -544,7 +554,7 @@ std::string parse_dns_public(const char *s)
}
else
{
dns_public_addr = std::string(s + strlen("tcp://"));
dns_public_addr.push_back(std::string(s + strlen("tcp://")));
}
}
else