Complete IP Helper Application Source Code
The following is the complete source code for the IP Helper application. Additional error checking has been added to source code.
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <time.h>
// Need to link with Iphlpapi.lib and Ws2_32.lib
#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")
#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))
/* Note: could also use malloc() and free() */
int main()
{
/* Some general variables */
ULONG ulOutBufLen;
DWORD dwRetVal;
unsigned int i;
/* variables used for GetNetworkParams */
FIXED_INFO *pFixedInfo;
IP_ADDR_STRING *pIPAddr;
/* variables used for GetAdapterInfo */
IP_ADAPTER_INFO *pAdapterInfo;
IP_ADAPTER_INFO *pAdapter;
/* variables used to print DHCP time info */
struct tm newtime;
char buffer[32];
errno_t error;
/* variables used for GetInterfaceInfo */
IP_INTERFACE_INFO *pInterfaceInfo;
/* variables used for GetIpAddrTable */
MIB_IPADDRTABLE *pIPAddrTable;
DWORD dwSize;
IN_ADDR IPAddr;
char *strIPAddr;
/* variables used for AddIpAddress */
UINT iaIPAddress;
UINT imIPMask;
ULONG NTEContext;
ULONG NTEInstance;
/* variables used for GetIpStatistics */
MIB_IPSTATS *pStats;
/* variables used for GetTcpStatistics */
MIB_TCPSTATS *pTCPStats;
printf("------------------------\n");
printf("This is GetNetworkParams\n");
printf("------------------------\n");
pFixedInfo = (FIXED_INFO *) MALLOC(sizeof (FIXED_INFO));
if (pFixedInfo == NULL) {
printf("Error allocating memory needed to call GetNetworkParams\n");
return 1;
}
ulOutBufLen = sizeof (FIXED_INFO);
if (GetNetworkParams(pFixedInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {
FREE(pFixedInfo);
pFixedInfo = (FIXED_INFO *) MALLOC(ulOutBufLen);
if (pFixedInfo == NULL) {
printf("Error allocating memory needed to call GetNetworkParams\n");
return 1;
}
}
if (dwRetVal = GetNetworkParams(pFixedInfo, &ulOutBufLen) != NO_ERROR) {
printf("GetNetworkParams failed with error %d\n", dwRetVal);
if (pFixedInfo)
FREE(pFixedInfo);
return 1;
} else {
printf("\tHost Name: %s\n", pFixedInfo->HostName);
printf("\tDomain Name: %s\n", pFixedInfo->DomainName);
printf("\tDNS Servers:\n");
printf("\t\t%s\n", pFixedInfo->DnsServerList.IpAddress.String);
pIPAddr = pFixedInfo->DnsServerList.Next;
while (pIPAddr) {
printf("\t\t%s\n", pIPAddr->IpAddress.String);
pIPAddr = pIPAddr->Next;
}
printf("\tNode Type: ");
switch (pFixedInfo->NodeType) {
case 1:
printf("%s\n", "Broadcast");
break;
case 2:
printf("%s\n", "Peer to peer");
break;
case 4:
printf("%s\n", "Mixed");
break;
case 8:
printf("%s\n", "Hybrid");
break;
default:
printf("\n");
}
printf("\tNetBIOS Scope ID: %s\n", pFixedInfo->ScopeId);
if (pFixedInfo->EnableRouting)
printf("\tIP Routing Enabled: Yes\n");
else
printf("\tIP Routing Enabled: No\n");
if (pFixedInfo->EnableProxy)
printf("\tWINS Proxy Enabled: Yes\n");
else
printf("\tWINS Proxy Enabled: No\n");
if (pFixedInfo->EnableDns)
printf("\tNetBIOS Resolution Uses DNS: Yes\n");
else
printf("\tNetBIOS Resolution Uses DNS: No\n");
}
/* Free allocated memory no longer needed */
if (pFixedInfo) {
FREE(pFixedInfo);
pFixedInfo = NULL;
}
printf("------------------------\n");
printf("This is GetAdaptersInfo\n");
printf("------------------------\n");
pAdapterInfo = (IP_ADAPTER_INFO *) MALLOC(sizeof (IP_ADAPTER_INFO));
if (pAdapterInfo == NULL) {
printf("Error allocating memory needed to call GetAdapterInfo\n");
return 1;
}
ulOutBufLen = sizeof (IP_ADAPTER_INFO);
if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {
FREE(pAdapterInfo);
pAdapterInfo = (IP_ADAPTER_INFO *) MALLOC(ulOutBufLen);
if (pAdapterInfo == NULL) {
printf("Error allocating memory needed to call GetAdapterInfo\n");
return 1;
}
}
if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) != NO_ERROR) {
printf("GetAdaptersInfo failed with error %d\n", dwRetVal);
if (pAdapterInfo)
FREE(pAdapterInfo);
return 1;
}
pAdapter = pAdapterInfo;
while (pAdapter) {
printf("\tAdapter Name: \t%s\n", pAdapter->AdapterName);
printf("\tAdapter Desc: \t%s\n", pAdapter->Description);
printf("\tAdapter Addr: \t");
for (i = 0; i < (int) pAdapter->AddressLength; i++) {
if (i == (pAdapter->AddressLength - 1))
printf("%.2X\n", (int) pAdapter->Address[i]);
else
printf("%.2X-", (int) pAdapter->Address[i]);
}
printf("\tIP Address: \t%s\n",
pAdapter->IpAddressList.IpAddress.String);
printf("\tIP Mask: \t%s\n", pAdapter->IpAddressList.IpMask.String);
printf("\tGateway: \t%s\n", pAdapter->GatewayList.IpAddress.String);
printf("\t***\n");
if (pAdapter->DhcpEnabled) {
printf("\tDHCP Enabled: \tYes\n");
printf("\tDHCP Server: \t%s\n",
pAdapter->DhcpServer.IpAddress.String);
printf("\tLease Obtained: ");
/* Display local time */
error = _localtime32_s(&newtime, (__time32_t*) &pAdapter->LeaseObtained);
if (error)
printf("\tInvalid Argument to _localtime32_s\n");
else {
// Convert to an ASCII representation
error = asctime_s(buffer, 32, &newtime);
if (error)
printf("Invalid Argument to asctime_s\n");
else
/* asctime_s returns the string terminated by \n\0 */
printf("%s", buffer);
}
printf("\tLease Expires: ");
error = _localtime32_s(&newtime, (__time32_t*) &pAdapter->LeaseExpires);
if (error)
printf("Invalid Argument to _localtime32_s\n");
else {
// Convert to an ASCII representation
error = asctime_s(buffer, 32, &newtime);
if (error)
printf("Invalid Argument to asctime_s\n");
else
/* asctime_s returns the string terminated by \n\0 */
printf("%s", buffer);
}
} else
printf("\tDHCP Enabled: \tNo\n");
if (pAdapter->HaveWins) {
printf("\tHave Wins: \tYes\n");
printf("\tPrimary Wins Server: \t%s\n",
pAdapter->PrimaryWinsServer.IpAddress.String);
printf("\tSecondary Wins Server: \t%s\n",
pAdapter->SecondaryWinsServer.IpAddress.String);
} else
printf("\tHave Wins: \tNo\n");
printf("\n");
pAdapter = pAdapter->Next;
}
printf("------------------------\n");
printf("This is GetInterfaceInfo\n");
printf("------------------------\n");
pInterfaceInfo = (IP_INTERFACE_INFO *) MALLOC(sizeof (IP_INTERFACE_INFO));
if (pInterfaceInfo == NULL) {
printf("Error allocating memory needed to call GetInterfaceInfo\n");
return 1;
}
ulOutBufLen = sizeof (IP_INTERFACE_INFO);
if (GetInterfaceInfo(pInterfaceInfo, &ulOutBufLen) ==
ERROR_INSUFFICIENT_BUFFER) {
FREE(pInterfaceInfo);
pInterfaceInfo = (IP_INTERFACE_INFO *) MALLOC(ulOutBufLen);
if (pInterfaceInfo == NULL) {
printf("Error allocating memory needed to call GetInterfaceInfo\n");
return 1;
}
printf("\t The size needed for the output buffer ulLen = %ld\n",
ulOutBufLen);
}
if ((dwRetVal = GetInterfaceInfo(pInterfaceInfo, &ulOutBufLen)) == NO_ERROR) {
printf("\tNum Adapters: %ld\n\n", pInterfaceInfo->NumAdapters);
for (i = 0; i < (unsigned int) pInterfaceInfo->NumAdapters; i++) {
printf("\tAdapter Index[%d]: %ld\n", i,
pInterfaceInfo->Adapter[i].Index);
printf("\tAdapter Name[%d]: %ws\n\n", i,
pInterfaceInfo->Adapter[i].Name);
}
printf("GetInterfaceInfo call succeeded.\n");
} else {
LPVOID lpMsgBuf = NULL;
if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, dwRetVal, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) & lpMsgBuf, 0, NULL)) {
printf("\tError: %s", lpMsgBuf);
}
LocalFree(lpMsgBuf);
}
/* If DHCP enabled, release and renew the IP address */
/* THIS WORKS BUT IT TAKES A LONG TIME AND INTERRUPTS NET CONNECTIONS */
if (pAdapterInfo->DhcpEnabled && pInterfaceInfo->NumAdapters) {
printf("Calling IpReleaseAddress for Adapter[%d]\n", 0);
if ((dwRetVal =
IpReleaseAddress(&pInterfaceInfo->Adapter[0])) == NO_ERROR) {
printf("Ip Release succeeded.\n");
}
if ((dwRetVal =
IpRenewAddress(&pInterfaceInfo->Adapter[0])) == NO_ERROR) {
printf("Ip Renew succeeded.\n");
}
}
/* Free allocated memory no longer needed */
if (pAdapterInfo) {
FREE(pAdapterInfo);
pAdapterInfo = NULL;
}
if (pInterfaceInfo) {
FREE(pInterfaceInfo);
pInterfaceInfo = NULL;
}
printf("----------------------\n");
printf("This is GetIpAddrTable\n");
printf("----------------------\n");
pIPAddrTable = (MIB_IPADDRTABLE *) MALLOC(sizeof (MIB_IPADDRTABLE));
if (pIPAddrTable == NULL) {
printf("Error allocating memory needed to call GetIpAddrTable\n");
return 1;
}
dwSize = 0;
IPAddr.S_un.S_addr = ntohl(pIPAddrTable->table[1].dwAddr);
strIPAddr = inet_ntoa(IPAddr);
if (GetIpAddrTable(pIPAddrTable, &dwSize, 0) == ERROR_INSUFFICIENT_BUFFER) {
FREE(pIPAddrTable);
pIPAddrTable = (MIB_IPADDRTABLE *) MALLOC(dwSize);
if (pIPAddrTable == NULL) {
printf("Error allocating memory needed to call GetIpAddrTable\n");
return 1;
}
}
if ((dwRetVal = GetIpAddrTable(pIPAddrTable, &dwSize, 0)) != NO_ERROR) {
printf("GetIpAddrTable failed with error %d\n", dwRetVal);
if (pIPAddrTable)
FREE(pIPAddrTable);
return 1;
}
printf("\tNum Entries: %ld\n", pIPAddrTable->dwNumEntries);
for (i = 0; i < (unsigned int) pIPAddrTable->dwNumEntries; i++) {
printf("\n\tInterface Index[%d]:\t%ld\n", i,
pIPAddrTable->table[i].dwIndex);
IPAddr.S_un.S_addr = (u_long) pIPAddrTable->table[i].dwAddr;
printf("\tIP Address[%d]: \t%s\n", i, inet_ntoa(IPAddr));
IPAddr.S_un.S_addr = (u_long) pIPAddrTable->table[i].dwMask;
printf("\tSubnet Mask[%d]: \t%s\n", i, inet_ntoa(IPAddr));
IPAddr.S_un.S_addr = (u_long) pIPAddrTable->table[i].dwBCastAddr;
printf("\tBroadCast[%d]: \t%s (%ld%)\n", i, inet_ntoa(IPAddr),
pIPAddrTable->table[i].dwBCastAddr);
printf("\tReassembly size[%d]:\t%ld\n", i,
pIPAddrTable->table[i].dwReasmSize);
printf("\tAddress Index[%d]: \t%ld\n", i,
pIPAddrTable->table[i].dwIndex);
printf("\tType and State[%d]:", i);
if (pIPAddrTable->table[i].wType & MIB_IPADDR_PRIMARY)
printf("\tPrimary IP Address");
if (pIPAddrTable->table[i].wType & MIB_IPADDR_DYNAMIC)
printf("\tDynamic IP Address");
if (pIPAddrTable->table[i].wType & MIB_IPADDR_DISCONNECTED)
printf("\tAddress is on disconnected interface");
if (pIPAddrTable->table[i].wType & MIB_IPADDR_DELETED)
printf("\tAddress is being deleted");
if (pIPAddrTable->table[i].wType & MIB_IPADDR_TRANSIENT)
printf("\tTransient address");
printf("\n");
}
iaIPAddress = inet_addr("192.168.0.27");
imIPMask = inet_addr("255.255.255.0");
NTEContext = 0;
NTEInstance = 0;
if ((dwRetVal = AddIPAddress(iaIPAddress,
imIPMask,
pIPAddrTable->table[0].
dwIndex,
&NTEContext, &NTEInstance)) != NO_ERROR) {
LPVOID lpMsgBuf;
printf("\tError adding IP address.\n");
if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, dwRetVal, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPTSTR) & lpMsgBuf, 0, NULL)) {
printf("\tError: %s", lpMsgBuf);
}
LocalFree(lpMsgBuf);
}
if ((dwRetVal = DeleteIPAddress(NTEContext)) != NO_ERROR) {
printf("DeleteIPAddress failed with error %d\n", dwRetVal);
}
/* Free allocated memory no longer needed */
if (pIPAddrTable) {
FREE(pIPAddrTable);
pIPAddrTable = NULL;
}
printf("-------------------------\n");
printf("This is GetIPStatistics()\n");
printf("-------------------------\n");
pStats = (MIB_IPSTATS *) MALLOC(sizeof (MIB_IPSTATS));
if (pStats == NULL) {
printf("Error allocating memory needed to call GetIpStatistics\n");
return 1;
}
if ((dwRetVal = GetIpStatistics(pStats)) != NO_ERROR) {
printf("GetIPStatistics failed with error %d\n", dwRetVal);
if (pStats)
FREE(pStats);
return 1;
}
printf("\tNumber of IP addresses: %ld\n", pStats->dwNumAddr);
printf("\tNumber of Interfaces: %ld\n", pStats->dwNumIf);
printf("\tReceives: %ld\n", pStats->dwInReceives);
printf("\tOut Requests: %ld\n", pStats->dwOutRequests);
printf("\tRoutes: %ld\n", pStats->dwNumRoutes);
printf("\tTimeout Time: %ld\n", pStats->dwReasmTimeout);
printf("\tIn Delivers: %ld\n", pStats->dwInDelivers);
printf("\tIn Discards: %ld\n", pStats->dwInDiscards);
printf("\tTotal In: %ld\n", pStats->dwInDelivers + pStats->dwInDiscards);
printf("\tIn Header Errors: %ld\n", pStats->dwInHdrErrors);
/* Free allocated memory no longer needed */
if (pStats) {
FREE(pStats);
pStats = NULL;
}
printf("-------------------------\n");
printf("This is GetTCPStatistics()\n");
printf("-------------------------\n");
pTCPStats = (MIB_TCPSTATS *) MALLOC(sizeof (MIB_TCPSTATS));
if (pTCPStats == NULL) {
printf("Error allocating memory needed to call GetTcpStatistics\n");
return 1;
}
if ((dwRetVal = GetTcpStatistics(pTCPStats)) != NO_ERROR) {
printf("GetTcpStatistics failed with error %d\n", dwRetVal);
if (pTCPStats)
FREE(pTCPStats);
return 1;
}
printf("\tActive Opens: %ld\n", pTCPStats->dwActiveOpens);
printf("\tPassive Opens: %ld\n", pTCPStats->dwPassiveOpens);
printf("\tSegments Recv: %ld\n", pTCPStats->dwInSegs);
printf("\tSegments Xmit: %ld\n", pTCPStats->dwOutSegs);
printf("\tTotal # Conxs: %ld\n", pTCPStats->dwNumConns);
/* Free allocated memory no longer needed */
if (pTCPStats) {
FREE(pTCPStats);
pTCPStats = NULL;
}
return 0;
}
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