network-interface-predicate.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "network-interface-predicate.hpp"

#include "config-file.hpp"
#include "network-interface.hpp"
#include "network.hpp"

namespace nfd {

NetworkInterfacePredicate::NetworkInterfacePredicate()
{
  this->clear();
}

void
NetworkInterfacePredicate::clear()
{
  m_whitelist = std::set<std::string>{"*"};
  m_blacklist.clear();
}

static void
parseList(std::set<std::string>& set, const boost::property_tree::ptree& list, const std::string& section)
{
  set.clear();

  for (const auto& item : list) {
    if (item.first == "*") {
      // insert wildcard
      set.insert(item.first);
    }
    else if (item.first == "ifname") {
      // very basic sanity check for interface names
      auto name = item.second.get_value<std::string>();
      if (name.empty()) {
        BOOST_THROW_EXCEPTION(ConfigFile::Error("Empty interface name in \"" + section + "\" section"));
      }
      set.insert(name);
    }
    else if (item.first == "ether") {
      // validate ethernet address
      auto addr = item.second.get_value<std::string>();
      if (ethernet::Address::fromString(addr).isNull()) {
        BOOST_THROW_EXCEPTION(ConfigFile::Error("Malformed ether address \"" + addr +
                                                "\" in \"" + section + "\" section"));
      }
      set.insert(addr);
    }
    else if (item.first == "subnet") {
      // example subnet: 10.0.0.0/8
      auto cidr = item.second.get_value<std::string>();
      if (!Network::isValidCidr(cidr)) {
        BOOST_THROW_EXCEPTION(ConfigFile::Error("Malformed subnet declaration \"" + cidr +
                                                "\" in \"" + section + "\" section"));
      }
      set.insert(cidr);
    }
  }
}

void
NetworkInterfacePredicate::parseWhitelist(const boost::property_tree::ptree& list)
{
  parseList(m_whitelist, list, "whitelist");
}

void
NetworkInterfacePredicate::parseBlacklist(const boost::property_tree::ptree& list)
{
  parseList(m_blacklist, list, "blacklist");
}

static bool
doesMatchRule(const NetworkInterfaceInfo& nic, const std::string& rule)
{
  // if '/' is in rule, this is a subnet, check if IP in subnet
  if (rule.find('/') != std::string::npos) {
    Network n = boost::lexical_cast<Network>(rule);
    for (const auto& addr : nic.ipv4Addresses) {
      if (n.doesContain(addr)) {
        return true;
      }
    }
  }

  return rule == "*" ||
         nic.name == rule ||
         nic.etherAddress.toString() == rule;
}

bool
NetworkInterfacePredicate::operator()(const NetworkInterfaceInfo& nic) const
{
  return std::any_of(m_whitelist.begin(), m_whitelist.end(), bind(&doesMatchRule, nic, _1)) &&
         std::none_of(m_blacklist.begin(), m_blacklist.end(), bind(&doesMatchRule, nic, _1));
}

} // namespace nfd