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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "query-local-address.hh"
#include "iputils.hh"
#include "dns_random.hh"
namespace pdns {
static const ComboAddress local4("0.0.0.0");
static const ComboAddress local6("::");
static vector<ComboAddress> g_localQueryAddresses4;
static vector<ComboAddress> g_localQueryAddresses6;
ComboAddress getQueryLocalAddress(const sa_family_t family, const in_port_t port) {
ComboAddress ret;
if (family==AF_INET) {
if (g_localQueryAddresses4.empty()) {
ret = local4;
} else if (g_localQueryAddresses4.size() == 1) {
ret = g_localQueryAddresses4.at(0);
} else {
ret = g_localQueryAddresses4[dns_random(g_localQueryAddresses4.size())];
}
ret.sin4.sin_port = htons(port);
}
else {
if (g_localQueryAddresses6.empty()) {
ret = local6;
} else if (g_localQueryAddresses6.size() == 1) {
ret = g_localQueryAddresses6.at(0);
} else {
ret = g_localQueryAddresses6[dns_random(g_localQueryAddresses6.size())];
}
ret.sin6.sin6_port = htons(port);
}
return ret;
}
ComboAddress getNonAnyQueryLocalAddress(const sa_family_t family) {
if (family == AF_INET) {
for (const auto& addr : pdns::g_localQueryAddresses4) {
if (!IsAnyAddress(addr)) {
return addr;
}
}
}
if (family == AF_INET6) {
for (const auto& addr : pdns::g_localQueryAddresses6) {
if (!IsAnyAddress(addr)) {
return addr;
}
}
}
ComboAddress ret("0.0.0.0");
ret.reset(); // Ensure all is zero, even the addr family
return ret;
}
void parseQueryLocalAddress(const std::string &qla) {
vector<string> addrs;
stringtok(addrs, qla, ", ;");
for(const string& addr : addrs) {
ComboAddress tmp(addr);
if (tmp.isIPv4()) {
g_localQueryAddresses4.push_back(tmp);
continue;
}
g_localQueryAddresses6.push_back(tmp);
}
}
bool isQueryLocalAddressFamilyEnabled(const sa_family_t family) {
if (family == AF_INET) {
return !g_localQueryAddresses4.empty();
}
if (family == AF_INET6) {
return !g_localQueryAddresses6.empty();
}
return false;
}
} // namespace pdns
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