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Merge pull request #541

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5131b26 Replace tabs and remove trailing whitespace (warptangent)
0d40de4 Optionally restrict DNS queries to TCP (warptangent)
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Riccardo Spagni 2015-12-16 22:59:10 +02:00
commit f7d41d6e28
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1 changed files with 48 additions and 27 deletions
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21
src/common/dns_utils.cpp
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@ -183,12 +183,33 @@ struct DNSResolverData
DNSResolver::DNSResolver() : m_data(new DNSResolverData())
{
int use_dns_public = 0;
const char* dns_public_addr = "8.8.4.4";
if (auto res = getenv("DNS_PUBLIC"))
{
std::string dns_public(res);
// TODO: could allow parsing of IP and protocol: e.g. DNS_PUBLIC=tcp:8.8.8.8
if (dns_public == "tcp")
{
LOG_PRINT_L0("Using public DNS server: " << dns_public_addr << " (TCP)");
use_dns_public = 1;
}
}
// init libunbound context
m_data->m_ub_context = ub_ctx_create();
if (use_dns_public)
{
ub_ctx_set_fwd(m_data->m_ub_context, dns_public_addr);
ub_ctx_set_option(m_data->m_ub_context, "do-udp:", "no");
ub_ctx_set_option(m_data->m_ub_context, "do-tcp:", "yes");
}
else {
// look for "/etc/resolv.conf" and "/etc/hosts" or platform equivalent
ub_ctx_resolvconf(m_data->m_ub_context, NULL);
ub_ctx_hosts(m_data->m_ub_context, NULL);
}
#ifdef DEVELOPER_LIBUNBOUND_OLD
#pragma message "Using the work around for old libunbound"