util.cpp - openbmc/phosphor-networkd - Gitiles

 #include "util.hpp"

 #include "config_parser.hpp"
 #include "types.hpp"

 #include <arpa/inet.h>
 #include <dirent.h>
 #include <net/if.h>
 #include <sys/wait.h>

 #include <algorithm>
 #include <experimental/filesystem>
 #include <iostream>
 #include <list>
 #include <phosphor-logging/elog-errors.hpp>
 #include <phosphor-logging/log.hpp>
 #include <string>
 #include <xyz/openbmc_project/Common/error.hpp>

 namespace phosphor
 {
 namespace network
 {

 namespace
 {

 using namespace phosphor::logging;
 using namespace sdbusplus::xyz::openbmc_project::Common::Error;
 namespace fs = std::experimental::filesystem;

 uint8_t toV6Cidr(const std::string& subnetMask)
 {
     uint8_t pos = 0;
     uint8_t prevPos = 0;
     uint8_t cidr = 0;
     uint16_t buff{};
     do
     {
         // subnet mask look like ffff:ffff::
         // or ffff:c000::
         pos = subnetMask.find(":", prevPos);
         if (pos == std::string::npos)
         {
             break;
         }

         auto str = subnetMask.substr(prevPos, (pos - prevPos));
         prevPos = pos + 1;

         // String length is 0
         if (!str.length())
         {
             return cidr;
         }
         // converts it into number.
         if (sscanf(str.c_str(), "%hx", &buff) <= 0)
         {
             log<level::ERR>("Invalid Mask",
                             entry("SUBNETMASK=%s", subnetMask.c_str()));

             return 0;
         }

         // convert the number into bitset
         // and check for how many ones are there.
         // if we don't have all the ones then make
         // sure that all the ones should be left justify.

         if (__builtin_popcount(buff) != 16)
         {
             if (((sizeof(buff) * 8) - (__builtin_ctz(buff))) !=
                 __builtin_popcount(buff))
             {
                 log<level::ERR>("Invalid Mask",
                                 entry("SUBNETMASK=%s", subnetMask.c_str()));

                 return 0;
             }
             cidr += __builtin_popcount(buff);
             return cidr;
         }

         cidr += 16;
     } while (1);

     return cidr;
 }
 } // anonymous namespace

 uint8_t toCidr(int addressFamily, const std::string& subnetMask)
 {
     if (addressFamily == AF_INET6)
     {
         return toV6Cidr(subnetMask);
     }

     uint32_t buff;

     auto rc = inet_pton(addressFamily, subnetMask.c_str(), &buff);
     if (rc <= 0)
     {
         log<level::ERR>("inet_pton failed:",
                         entry("SUBNETMASK=%s", subnetMask.c_str()));
         return 0;
     }

     buff = be32toh(buff);
     // total no of bits - total no of leading zero == total no of ones
     if (((sizeof(buff) * 8) - (__builtin_ctz(buff))) ==
         __builtin_popcount(buff))
     {
         return __builtin_popcount(buff);
     }
     else
     {
         log<level::ERR>("Invalid Mask",
                         entry("SUBNETMASK=%s", subnetMask.c_str()));
         return 0;
     }
 }

 std::string toMask(int addressFamily, uint8_t prefix)
 {
     if (addressFamily == AF_INET6)
     {
         // TODO:- conversion for v6
         return "";
     }

     if (prefix < 1 || prefix > 30)
     {
         log<level::ERR>("Invalid Prefix", entry("PREFIX=%d", prefix));
         return "";
     }
     /* Create the netmask from the number of bits */
     unsigned long mask = 0;
     for (auto i = 0; i < prefix; i++)
     {
         mask |= 1 << (31 - i);
     }
     struct in_addr netmask;
     netmask.s_addr = htonl(mask);
     return inet_ntoa(netmask);
 }

 std::string getNetworkID(int addressFamily, const std::string& ipaddress,
                          uint8_t prefix)
 {
     unsigned char* pntMask = nullptr;
     unsigned char* pntNetwork = nullptr;
     int bit{};
     int offset{};
     struct in6_addr netmask
     {
     };
     const u_char maskbit[] = {0x00, 0x80, 0xc0, 0xe0, 0xf0,
                               0xf8, 0xfc, 0xfe, 0xff};

     pntMask = reinterpret_cast<unsigned char*>(&netmask);

     offset = prefix / 8;
     bit = prefix % 8;

     while (offset--)
     {
         *pntMask++ = 0xff;
     }

     if (bit)
     {
         *pntMask = maskbit[bit];
     }

     // convert ipaddres string into network address
     struct in6_addr ipaddressNetwork;
     if (inet_pton(addressFamily, ipaddress.c_str(), &ipaddressNetwork) <= 0)
     {
         log<level::ERR>("inet_pton failure",
                         entry("IPADDRESS=%s", ipaddress.c_str()));
         elog<InternalFailure>();

         return "";
     }

     // Now bit wise and gets you the network address
     pntMask = reinterpret_cast<unsigned char*>(&netmask);
     pntNetwork = reinterpret_cast<unsigned char*>(&ipaddressNetwork);

     for (int i = 0; i < 16; i++)
     {
         pntNetwork[i] = pntNetwork[i] & pntMask[i];
     }

     // convert the network address into string fomat.
     char networkString[INET6_ADDRSTRLEN] = {0};
     if (inet_ntop(addressFamily, &ipaddressNetwork, networkString,
                   INET6_ADDRSTRLEN) == NULL)
     {
         log<level::ERR>("inet_ntop failure");
         elog<InternalFailure>();
     }
     return networkString;
 }

 bool isLinkLocalIP(const std::string& address)
 {
     return address.find(IPV4_PREFIX) == 0 || address.find(IPV6_PREFIX) == 0;
 }

 bool isValidIP(int addressFamily, const std::string& address)
 {
     unsigned char buf[sizeof(struct in6_addr)];

     return inet_pton(addressFamily, address.c_str(), buf) > 0;
 }

 bool isValidPrefix(int addressFamily, uint8_t prefixLength)
 {
     if (addressFamily == AF_INET)
     {
         if (prefixLength < IPV4_MIN_PREFIX_LENGTH ||
             prefixLength > IPV4_MAX_PREFIX_LENGTH)
         {
             return false;
         }
     }

     if (addressFamily == AF_INET6)
     {
         if (prefixLength < IPV4_MIN_PREFIX_LENGTH ||
             prefixLength > IPV6_MAX_PREFIX_LENGTH)
         {
             return false;
         }
     }

     return true;
 }

 IntfAddrMap getInterfaceAddrs()
 {
     IntfAddrMap intfMap{};
     struct ifaddrs* ifaddr = nullptr;

     // attempt to fill struct with ifaddrs
     if (getifaddrs(&ifaddr) == -1)
     {
         auto error = errno;
         log<level::ERR>("Error occurred during the getifaddrs call",
                         entry("ERRNO=%s", strerror(error)));
         elog<InternalFailure>();
     }

     AddrPtr ifaddrPtr(ifaddr);
     ifaddr = nullptr;

     std::string intfName{};

     for (ifaddrs* ifa = ifaddrPtr.get(); ifa != nullptr; ifa = ifa->ifa_next)
     {
         // walk interfaces
         if (ifa->ifa_addr == nullptr)
         {
             continue;
         }

         // get only INET interfaces not ipv6
         if (ifa->ifa_addr->sa_family == AF_INET ||
             ifa->ifa_addr->sa_family == AF_INET6)
         {
             // if loopback, or not running ignore
             if ((ifa->ifa_flags & IFF_LOOPBACK) ||
                 !(ifa->ifa_flags & IFF_RUNNING))
             {
                 continue;
             }
             intfName = ifa->ifa_name;
             AddrInfo info{};
             char ip[INET6_ADDRSTRLEN] = {0};
             char subnetMask[INET6_ADDRSTRLEN] = {0};

             if (ifa->ifa_addr->sa_family == AF_INET)
             {

                 inet_ntop(ifa->ifa_addr->sa_family,
                           &(((struct sockaddr_in*)(ifa->ifa_addr))->sin_addr),
                           ip, sizeof(ip));

                 inet_ntop(
                     ifa->ifa_addr->sa_family,
                     &(((struct sockaddr_in*)(ifa->ifa_netmask))->sin_addr),
                     subnetMask, sizeof(subnetMask));
             }
             else
             {
                 inet_ntop(ifa->ifa_addr->sa_family,
                           &(((struct sockaddr_in6*)(ifa->ifa_addr))->sin6_addr),
                           ip, sizeof(ip));

                 inet_ntop(
                     ifa->ifa_addr->sa_family,
                     &(((struct sockaddr_in6*)(ifa->ifa_netmask))->sin6_addr),
                     subnetMask, sizeof(subnetMask));
             }

             info.addrType = ifa->ifa_addr->sa_family;
             info.ipaddress = ip;
             info.prefix = toCidr(info.addrType, std::string(subnetMask));
             intfMap[intfName].push_back(info);
         }
     }
     return intfMap;
 }

 InterfaceList getInterfaces()
 {
     InterfaceList interfaces{};
     struct ifaddrs* ifaddr = nullptr;

     // attempt to fill struct with ifaddrs
     if (getifaddrs(&ifaddr) == -1)
     {
         auto error = errno;
         log<level::ERR>("Error occurred during the getifaddrs call",
                         entry("ERRNO=%d", error));
         elog<InternalFailure>();
     }

     AddrPtr ifaddrPtr(ifaddr);
     ifaddr = nullptr;

     for (ifaddrs* ifa = ifaddrPtr.get(); ifa != nullptr; ifa = ifa->ifa_next)
     {
         // walk interfaces
         // if loopback, or not running ignore
         if ((ifa->ifa_flags & IFF_LOOPBACK) || !(ifa->ifa_flags & IFF_RUNNING))
         {
             continue;
         }
         interfaces.emplace(ifa->ifa_name);
     }
     return interfaces;
 }

 void deleteInterface(const std::string& intf)
 {
     pid_t pid = fork();
     int status{};

     if (pid == 0)
     {

         execl("/sbin/ip", "ip", "link", "delete", "dev", intf.c_str(), nullptr);
         auto error = errno;
         log<level::ERR>("Couldn't delete the device", entry("ERRNO=%d", error),
                         entry("INTF=%s", intf.c_str()));
         elog<InternalFailure>();
     }
     else if (pid < 0)
     {
         auto error = errno;
         log<level::ERR>("Error occurred during fork", entry("ERRNO=%d", error));
         elog<InternalFailure>();
     }
     else if (pid > 0)
     {
         while (waitpid(pid, &status, 0) == -1)
         {
             if (errno != EINTR)
             { /* Error other than EINTR */
                 status = -1;
                 break;
             }
         }

         if (status < 0)
         {
             log<level::ERR>("Unable to delete the interface",
                             entry("INTF=%s", intf.c_str()),
                             entry("STATUS=%d", status));
             elog<InternalFailure>();
         }
     }
 }

 bool getDHCPValue(const std::string& confDir, const std::string& intf)
 {
     bool dhcp = false;
     // Get the interface mode value from systemd conf
     // using namespace std::string_literals;
     fs::path confPath = confDir;
     std::string fileName = systemd::config::networkFilePrefix + intf +
                            systemd::config::networkFileSuffix;
     confPath /= fileName;

     auto rc = config::ReturnCode::SUCCESS;
     config::ValueList values;
     config::Parser parser(confPath.string());

     std::tie(rc, values) = parser.getValues("Network", "DHCP");
     if (rc != config::ReturnCode::SUCCESS)
     {
         log<level::DEBUG>("Unable to get the value for Network[DHCP]",
                           entry("RC=%d", rc));
         return dhcp;
     }
     // There will be only single value for DHCP key.
     if (values[0] == "true")
     {
         dhcp = true;
     }
     return dhcp;
 }

 namespace internal
 {

 void executeCommandinChildProcess(const char* path, char** args)
 {
     using namespace std::string_literals;
     pid_t pid = fork();
     int status{};

     if (pid == 0)
     {
         execv(path, args);
         auto error = errno;
         // create the command from var args.
         std::string command = path + " "s;

         for (int i = 0; args[i]; i++)
         {
             command += args[i] + " "s;
         }

         log<level::ERR>("Couldn't exceute the command",
                         entry("ERRNO=%d", error),
                         entry("CMD=%s", command.c_str()));
         elog<InternalFailure>();
     }
     else if (pid < 0)
     {
         auto error = errno;
         log<level::ERR>("Error occurred during fork", entry("ERRNO=%d", error));
         elog<InternalFailure>();
     }
     else if (pid > 0)
     {
         while (waitpid(pid, &status, 0) == -1)
         {
             if (errno != EINTR)
             { // Error other than EINTR
                 status = -1;
                 break;
             }
         }

         if (status < 0)
         {
             std::string command = path + " "s;
             for (int i = 0; args[i]; i++)
             {
                 command += args[i] + " "s;
             }

             log<level::ERR>("Unable to execute the command",
                             entry("CMD=%s", command.c_str()),
                             entry("STATUS=%d", status));
             elog<InternalFailure>();
         }
     }
 }
 } // namespace internal

 namespace mac_address
 {

 constexpr auto mapperBus = "xyz.openbmc_project.ObjectMapper";
 constexpr auto mapperObj = "/xyz/openbmc_project/object_mapper";
 constexpr auto mapperIntf = "xyz.openbmc_project.ObjectMapper";
 constexpr auto propIntf = "org.freedesktop.DBus.Properties";
 constexpr auto methodGet = "Get";

 using DbusObjectPath = std::string;
 using DbusService = std::string;
 using DbusInterface = std::string;
 using ObjectTree =
     std::map<DbusObjectPath, std::map<DbusService, std::vector<DbusInterface>>>;

 constexpr auto invBus = "xyz.openbmc_project.Inventory.Manager";
 constexpr auto invNetworkIntf =
     "xyz.openbmc_project.Inventory.Item.NetworkInterface";
 constexpr auto invRoot = "/xyz/openbmc_project/inventory";

 std::string getfromInventory(sdbusplus::bus::bus& bus)
 {
     std::vector<DbusInterface> interfaces;
     interfaces.emplace_back(invNetworkIntf);

     auto depth = 0;

     auto mapperCall =
         bus.new_method_call(mapperBus, mapperObj, mapperIntf, "GetSubTree");

     mapperCall.append(invRoot, depth, interfaces);

     auto mapperReply = bus.call(mapperCall);
     if (mapperReply.is_method_error())
     {
         log<level::ERR>("Error in mapper call");
         elog<InternalFailure>();
     }

     ObjectTree objectTree;
     mapperReply.read(objectTree);

     if (objectTree.empty())
     {
         log<level::ERR>("No Object has implemented the interface",
                         entry("INTERFACE=%s", invNetworkIntf));
         elog<InternalFailure>();
     }

     // It is expected that only one object has implemented this interface.

     auto objPath = objectTree.begin()->first;
     auto service = objectTree.begin()->second.begin()->first;

     sdbusplus::message::variant<std::string> value;

     auto method = bus.new_method_call(service.c_str(), objPath.c_str(),
                                       propIntf, methodGet);

     method.append(invNetworkIntf, "MACAddress");

     auto reply = bus.call(method);
     if (reply.is_method_error())
     {
         log<level::ERR>("Failed to get MACAddress",
                         entry("PATH=%s", objPath.c_str()),
                         entry("INTERFACE=%s", invNetworkIntf));
         elog<InternalFailure>();
     }

     reply.read(value);
     return sdbusplus::message::variant_ns::get<std::string>(value);
 }

 } // namespace mac_address
 } // namespace network
 } // namespace phosphor
	#include "util.hpp"

	#include "config_parser.hpp"
	#include "types.hpp"

	#include <arpa/inet.h>
	#include <dirent.h>
	#include <net/if.h>
	#include <sys/wait.h>

	#include <algorithm>
	#include <experimental/filesystem>
	#include <iostream>
	#include <list>
	#include <phosphor-logging/elog-errors.hpp>
	#include <phosphor-logging/log.hpp>
	#include <string>
	#include <xyz/openbmc_project/Common/error.hpp>

	namespace phosphor
	{
	namespace network
	{

	namespace
	{

	using namespace phosphor::logging;
	using namespace sdbusplus::xyz::openbmc_project::Common::Error;
	namespace fs = std::experimental::filesystem;

	uint8_t toV6Cidr(const std::string& subnetMask)
	{
	uint8_t pos = 0;
	uint8_t prevPos = 0;
	uint8_t cidr = 0;
	uint16_t buff{};
	do
	{
	// subnet mask look like ffff:ffff::
	// or ffff:c000::
	pos = subnetMask.find(":", prevPos);
	if (pos == std::string::npos)
	{
	break;
	}

	auto str = subnetMask.substr(prevPos, (pos - prevPos));
	prevPos = pos + 1;

	// String length is 0
	if (!str.length())
	{
	return cidr;
	}
	// converts it into number.
	if (sscanf(str.c_str(), "%hx", &buff) <= 0)
	{
	log<level::ERR>("Invalid Mask",
	entry("SUBNETMASK=%s", subnetMask.c_str()));

	return 0;
	}

	// convert the number into bitset
	// and check for how many ones are there.
	// if we don't have all the ones then make
	// sure that all the ones should be left justify.

	if (__builtin_popcount(buff) != 16)
	{
	if (((sizeof(buff) * 8) - (__builtin_ctz(buff))) !=
	__builtin_popcount(buff))
	{
	log<level::ERR>("Invalid Mask",
	entry("SUBNETMASK=%s", subnetMask.c_str()));

	return 0;
	}
	cidr += __builtin_popcount(buff);
	return cidr;
	}

	cidr += 16;
	} while (1);

	return cidr;
	}
	} // anonymous namespace

	uint8_t toCidr(int addressFamily, const std::string& subnetMask)
	{
	if (addressFamily == AF_INET6)
	{
	return toV6Cidr(subnetMask);
	}

	uint32_t buff;

	auto rc = inet_pton(addressFamily, subnetMask.c_str(), &buff);
	if (rc <= 0)
	{
	log<level::ERR>("inet_pton failed:",
	entry("SUBNETMASK=%s", subnetMask.c_str()));
	return 0;
	}

	buff = be32toh(buff);
	// total no of bits - total no of leading zero == total no of ones
	if (((sizeof(buff) * 8) - (__builtin_ctz(buff))) ==
	__builtin_popcount(buff))
	{
	return __builtin_popcount(buff);
	}
	else
	{
	log<level::ERR>("Invalid Mask",
	entry("SUBNETMASK=%s", subnetMask.c_str()));
	return 0;
	}
	}

	std::string toMask(int addressFamily, uint8_t prefix)
	{
	if (addressFamily == AF_INET6)
	{
	// TODO:- conversion for v6
	return "";
	}

	if (prefix < 1 \|\| prefix > 30)
	{
	log<level::ERR>("Invalid Prefix", entry("PREFIX=%d", prefix));
	return "";
	}
	/* Create the netmask from the number of bits */
	unsigned long mask = 0;
	for (auto i = 0; i < prefix; i++)
	{
	mask \|= 1 << (31 - i);
	}
	struct in_addr netmask;
	netmask.s_addr = htonl(mask);
	return inet_ntoa(netmask);
	}

	std::string getNetworkID(int addressFamily, const std::string& ipaddress,
	uint8_t prefix)
	{
	unsigned char* pntMask = nullptr;
	unsigned char* pntNetwork = nullptr;
	int bit{};
	int offset{};
	struct in6_addr netmask
	{
	};
	const u_char maskbit[] = {0x00, 0x80, 0xc0, 0xe0, 0xf0,
	0xf8, 0xfc, 0xfe, 0xff};

	pntMask = reinterpret_cast<unsigned char*>(&netmask);

	offset = prefix / 8;
	bit = prefix % 8;

	while (offset--)
	{
	*pntMask++ = 0xff;
	}

	if (bit)
	{
	*pntMask = maskbit[bit];
	}

	// convert ipaddres string into network address
	struct in6_addr ipaddressNetwork;
	if (inet_pton(addressFamily, ipaddress.c_str(), &ipaddressNetwork) <= 0)
	{
	log<level::ERR>("inet_pton failure",
	entry("IPADDRESS=%s", ipaddress.c_str()));
	elog<InternalFailure>();

	return "";
	}

	// Now bit wise and gets you the network address
	pntMask = reinterpret_cast<unsigned char*>(&netmask);
	pntNetwork = reinterpret_cast<unsigned char*>(&ipaddressNetwork);

	for (int i = 0; i < 16; i++)
	{
	pntNetwork[i] = pntNetwork[i] & pntMask[i];
	}

	// convert the network address into string fomat.
	char networkString[INET6_ADDRSTRLEN] = {0};
	if (inet_ntop(addressFamily, &ipaddressNetwork, networkString,
	INET6_ADDRSTRLEN) == NULL)
	{
	log<level::ERR>("inet_ntop failure");
	elog<InternalFailure>();
	}
	return networkString;
	}

	bool isLinkLocalIP(const std::string& address)
	{
	return address.find(IPV4_PREFIX) == 0 \|\| address.find(IPV6_PREFIX) == 0;
	}

	bool isValidIP(int addressFamily, const std::string& address)
	{
	unsigned char buf[sizeof(struct in6_addr)];

	return inet_pton(addressFamily, address.c_str(), buf) > 0;
	}

	bool isValidPrefix(int addressFamily, uint8_t prefixLength)
	{
	if (addressFamily == AF_INET)
	{
	if (prefixLength < IPV4_MIN_PREFIX_LENGTH \|\|
	prefixLength > IPV4_MAX_PREFIX_LENGTH)
	{
	return false;
	}
	}

	if (addressFamily == AF_INET6)
	{
	if (prefixLength < IPV4_MIN_PREFIX_LENGTH \|\|
	prefixLength > IPV6_MAX_PREFIX_LENGTH)
	{
	return false;
	}
	}

	return true;
	}

	IntfAddrMap getInterfaceAddrs()
	{
	IntfAddrMap intfMap{};
	struct ifaddrs* ifaddr = nullptr;

	// attempt to fill struct with ifaddrs
	if (getifaddrs(&ifaddr) == -1)
	{
	auto error = errno;
	log<level::ERR>("Error occurred during the getifaddrs call",
	entry("ERRNO=%s", strerror(error)));
	elog<InternalFailure>();
	}

	AddrPtr ifaddrPtr(ifaddr);
	ifaddr = nullptr;

	std::string intfName{};

	for (ifaddrs* ifa = ifaddrPtr.get(); ifa != nullptr; ifa = ifa->ifa_next)
	{
	// walk interfaces
	if (ifa->ifa_addr == nullptr)
	{
	continue;
	}

	// get only INET interfaces not ipv6
	if (ifa->ifa_addr->sa_family == AF_INET \|\|
	ifa->ifa_addr->sa_family == AF_INET6)
	{
	// if loopback, or not running ignore
	if ((ifa->ifa_flags & IFF_LOOPBACK) \|\|
	!(ifa->ifa_flags & IFF_RUNNING))
	{
	continue;
	}
	intfName = ifa->ifa_name;
	AddrInfo info{};
	char ip[INET6_ADDRSTRLEN] = {0};
	char subnetMask[INET6_ADDRSTRLEN] = {0};

	if (ifa->ifa_addr->sa_family == AF_INET)
	{

	inet_ntop(ifa->ifa_addr->sa_family,
	&(((struct sockaddr_in*)(ifa->ifa_addr))->sin_addr),
	ip, sizeof(ip));

	inet_ntop(
	ifa->ifa_addr->sa_family,
	&(((struct sockaddr_in*)(ifa->ifa_netmask))->sin_addr),
	subnetMask, sizeof(subnetMask));
	}
	else
	{
	inet_ntop(ifa->ifa_addr->sa_family,
	&(((struct sockaddr_in6*)(ifa->ifa_addr))->sin6_addr),
	ip, sizeof(ip));

	inet_ntop(
	ifa->ifa_addr->sa_family,
	&(((struct sockaddr_in6*)(ifa->ifa_netmask))->sin6_addr),
	subnetMask, sizeof(subnetMask));
	}

	info.addrType = ifa->ifa_addr->sa_family;
	info.ipaddress = ip;
	info.prefix = toCidr(info.addrType, std::string(subnetMask));
	intfMap[intfName].push_back(info);
	}
	}
	return intfMap;
	}

	InterfaceList getInterfaces()
	{
	InterfaceList interfaces{};
	struct ifaddrs* ifaddr = nullptr;

	// attempt to fill struct with ifaddrs
	if (getifaddrs(&ifaddr) == -1)
	{
	auto error = errno;
	log<level::ERR>("Error occurred during the getifaddrs call",
	entry("ERRNO=%d", error));
	elog<InternalFailure>();
	}

	AddrPtr ifaddrPtr(ifaddr);
	ifaddr = nullptr;

	for (ifaddrs* ifa = ifaddrPtr.get(); ifa != nullptr; ifa = ifa->ifa_next)
	{
	// walk interfaces
	// if loopback, or not running ignore
	if ((ifa->ifa_flags & IFF_LOOPBACK) \|\| !(ifa->ifa_flags & IFF_RUNNING))
	{
	continue;
	}
	interfaces.emplace(ifa->ifa_name);
	}
	return interfaces;
	}

	void deleteInterface(const std::string& intf)
	{
	pid_t pid = fork();
	int status{};

	if (pid == 0)
	{

	execl("/sbin/ip", "ip", "link", "delete", "dev", intf.c_str(), nullptr);
	auto error = errno;
	log<level::ERR>("Couldn't delete the device", entry("ERRNO=%d", error),
	entry("INTF=%s", intf.c_str()));
	elog<InternalFailure>();
	}
	else if (pid < 0)
	{
	auto error = errno;
	log<level::ERR>("Error occurred during fork", entry("ERRNO=%d", error));
	elog<InternalFailure>();
	}
	else if (pid > 0)
	{
	while (waitpid(pid, &status, 0) == -1)
	{
	if (errno != EINTR)
	{ /* Error other than EINTR */
	status = -1;
	break;
	}
	}

	if (status < 0)
	{
	log<level::ERR>("Unable to delete the interface",
	entry("INTF=%s", intf.c_str()),
	entry("STATUS=%d", status));
	elog<InternalFailure>();
	}
	}
	}

	bool getDHCPValue(const std::string& confDir, const std::string& intf)
	{
	bool dhcp = false;
	// Get the interface mode value from systemd conf
	// using namespace std::string_literals;
	fs::path confPath = confDir;
	std::string fileName = systemd::config::networkFilePrefix + intf +
	systemd::config::networkFileSuffix;
	confPath /= fileName;

	auto rc = config::ReturnCode::SUCCESS;
	config::ValueList values;
	config::Parser parser(confPath.string());

	std::tie(rc, values) = parser.getValues("Network", "DHCP");
	if (rc != config::ReturnCode::SUCCESS)
	{
	log<level::DEBUG>("Unable to get the value for Network[DHCP]",
	entry("RC=%d", rc));
	return dhcp;
	}
	// There will be only single value for DHCP key.
	if (values[0] == "true")
	{
	dhcp = true;
	}
	return dhcp;
	}

	namespace internal
	{

	void executeCommandinChildProcess(const char* path, char** args)
	{
	using namespace std::string_literals;
	pid_t pid = fork();
	int status{};

	if (pid == 0)
	{
	execv(path, args);
	auto error = errno;
	// create the command from var args.
	std::string command = path + " "s;

	for (int i = 0; args[i]; i++)
	{
	command += args[i] + " "s;
	}

	log<level::ERR>("Couldn't exceute the command",
	entry("ERRNO=%d", error),
	entry("CMD=%s", command.c_str()));
	elog<InternalFailure>();
	}
	else if (pid < 0)
	{
	auto error = errno;
	log<level::ERR>("Error occurred during fork", entry("ERRNO=%d", error));
	elog<InternalFailure>();
	}
	else if (pid > 0)
	{
	while (waitpid(pid, &status, 0) == -1)
	{
	if (errno != EINTR)
	{ // Error other than EINTR
	status = -1;
	break;
	}
	}

	if (status < 0)
	{
	std::string command = path + " "s;
	for (int i = 0; args[i]; i++)
	{
	command += args[i] + " "s;
	}

	log<level::ERR>("Unable to execute the command",
	entry("CMD=%s", command.c_str()),
	entry("STATUS=%d", status));
	elog<InternalFailure>();
	}
	}
	}
	} // namespace internal

	namespace mac_address
	{

	constexpr auto mapperBus = "xyz.openbmc_project.ObjectMapper";
	constexpr auto mapperObj = "/xyz/openbmc_project/object_mapper";
	constexpr auto mapperIntf = "xyz.openbmc_project.ObjectMapper";
	constexpr auto propIntf = "org.freedesktop.DBus.Properties";
	constexpr auto methodGet = "Get";

	using DbusObjectPath = std::string;
	using DbusService = std::string;
	using DbusInterface = std::string;
	using ObjectTree =
	std::map<DbusObjectPath, std::map<DbusService, std::vector<DbusInterface>>>;

	constexpr auto invBus = "xyz.openbmc_project.Inventory.Manager";
	constexpr auto invNetworkIntf =
	"xyz.openbmc_project.Inventory.Item.NetworkInterface";
	constexpr auto invRoot = "/xyz/openbmc_project/inventory";

	std::string getfromInventory(sdbusplus::bus::bus& bus)
	{
	std::vector<DbusInterface> interfaces;
	interfaces.emplace_back(invNetworkIntf);

	auto depth = 0;

	auto mapperCall =
	bus.new_method_call(mapperBus, mapperObj, mapperIntf, "GetSubTree");

	mapperCall.append(invRoot, depth, interfaces);

	auto mapperReply = bus.call(mapperCall);
	if (mapperReply.is_method_error())
	{
	log<level::ERR>("Error in mapper call");
	elog<InternalFailure>();
	}

	ObjectTree objectTree;
	mapperReply.read(objectTree);

	if (objectTree.empty())
	{
	log<level::ERR>("No Object has implemented the interface",
	entry("INTERFACE=%s", invNetworkIntf));
	elog<InternalFailure>();
	}

	// It is expected that only one object has implemented this interface.

	auto objPath = objectTree.begin()->first;
	auto service = objectTree.begin()->second.begin()->first;

	sdbusplus::message::variant<std::string> value;

	auto method = bus.new_method_call(service.c_str(), objPath.c_str(),
	propIntf, methodGet);

	method.append(invNetworkIntf, "MACAddress");

	auto reply = bus.call(method);
	if (reply.is_method_error())
	{
	log<level::ERR>("Failed to get MACAddress",
	entry("PATH=%s", objPath.c_str()),
	entry("INTERFACE=%s", invNetworkIntf));
	elog<InternalFailure>();
	}

	reply.read(value);
	return sdbusplus::message::variant_ns::get<std::string>(value);
	}

	} // namespace mac_address
	} // namespace network
	} // namespace phosphor