This sample illustrates how to programmatically change an IP address for a specific network adapter on your machine. This program also demonstrates how to retrieve existing network adapter IP configuration information using Win32 APIs.
IP configurations can be changed for a specific network adapter by using the AddIpAddress() and DeleteIpAddress() Ip Helper API functions. These functions require you to understand adapter index numbers and IP context numbers. In Windows, every network adapter has a unique index ID and every IP address has a unique context ID. Adapter index IDs and IP context numbers can be retrieved using the GetAdaptersInfo() IP Helper function. This program features a list option that displays current network adapter configuration information by showing all adapters index numbers and IP address context numbers associated with their corresponding network adaptors.
To execute this application, simply build the application using the Visual C++ (Version 5 SP 3 or better) Nmake.exe program generation facility. An ipchange.exe program should result. You can use any other C++ Compiler on windows.
Execute the ipchange.exe with the following parameters:
Ipchange.exe [ -l ] [ -a -n -i -m ] [ -d -c]
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- -l List adapter index IDs and IP Address context ID information
- -a Add IP Address option
- -d Delete IP Address option
- -i IP Address to specify with -a option
- -m Subnet Mask to specify with -a option
- -c IP context ID for an existing IP address -n Index ID of an existing network
adapter
Author: Jim Ohlund 21-Apr-98
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | #include <winsock2.h> #include <windows.h> #include <stdio.h> void Usage(void) { printf("Usage: Ipchange [ -l ] [ -a -n -i -m ] " "[ -d -c]\n\n" "\t -l List adapter index IDs and IP Address context ID information\n" "\t -a Add IP Address option\n" "\t -d Delete IP Address option\n" "\t -i IP Address to specify with -a option\n" "\t -m Subnet Mask to specify with -a option\n" "\t -c IP context ID for an existing IP address\n" "\t -n Index ID of an existing network adapter\n"); } void main(int argc, char* argv[]) { ULONG NTEContext = 0; ULONG NTEInstance; IPAddr NewIP; IPAddr NewMask; DWORD Index; DWORD Context; CHAR NewIPStr[64]; CHAR NewMaskStr[64]; PIP_ADAPTER_INFO pAdapterInfo, pAdapt; PIP_ADDR_STRING pAddrStr; DWORD AdapterInfoSize; DWORD Err; BOOL OptList = FALSE; BOOL OptAdd = FALSE; BOOL OptDel = FALSE; NewIPStr[0] = '\0'; NewMaskStr[0] = '\0'; Context = Index = -1; for (int i = 1; i < argc; i++) { if ((argv[i][0] == '-') || (argv[i][0] == '/')) { switch (tolower(argv[i][1])) { case 'l': OptList = TRUE; break; case 'a': OptAdd = TRUE; break; case 'c': if (strlen(argv[i]) > 2) Context = atoi(&argv[i][2]); break; case 'd': OptDel = TRUE; break; case 'i': if (strlen(argv[i]) > 2) strcpy(NewIPStr, &argv[i][2]); break; case 'm': if (strlen(argv[i]) > 2) strcpy(NewMaskStr, &argv[i][2]); break; case 'n': if (strlen(argv[i]) > 2) Index = atoi(&argv[i][2]); break; default: printf("default\n"); Usage(); return; } } else { printf("else\n"); Usage(); return; } } // Check options if ((OptAdd && (Index == -1 || NewIPStr[0] == '\0' || NewMaskStr[0] == '\0')) || (OptDel && Context == -1)) { Usage(); return; } // Get sizing information about all adapters AdapterInfoSize = 0; if ((Err = GetAdaptersInfo(NULL, &AdapterInfoSize)) != 0) { if (Err != ERROR_BUFFER_OVERFLOW) { printf("GetAdaptersInfo sizing failed with error %d\n", Err); return; } } // Allocate memory from sizing information if ((pAdapterInfo = (PIP_ADAPTER_INFO)GlobalAlloc(GPTR, AdapterInfoSize)) == NULL) { printf("Memory allocation error\n"); return; } // Get actual adapter information if ((Err = GetAdaptersInfo(pAdapterInfo, &AdapterInfoSize)) != 0) { printf("GetAdaptersInfo failed with error %d\n", Err); return; } if (OptList) { printf("MAC Address - Adapter\n" "Index Context Ip Address Subnet Mask\n" "--------------------------------------------------------------\n"); pAdapt = pAdapterInfo; while (pAdapt) { for (UINT i = 0; iAddressLength; i++) { if (i == (pAdapt->AddressLength - 1)) printf("%.2X - ", (int)pAdapt->Address[i]); else printf("%.2X-", (int)pAdapt->Address[i]); } printf("%s\n", pAdapt->Description); pAddrStr = &(pAdapt->IpAddressList); while (pAddrStr) { printf("%-10.d%-10.d%-20.20s%s\n", pAdapt->Index, pAddrStr->Context, pAddrStr->IpAddress.String, pAddrStr->IpMask.String); pAddrStr = pAddrStr->Next; } pAdapt = pAdapt->Next; } } if (OptAdd) { NewIP = inet_addr(NewIPStr); NewMask = inet_addr(NewMaskStr); if ((Err = AddIPAddress(NewIP, NewMask, Index, &NTEContext, &NTEInstance)) != 0) { printf("AddIPAddress failed with error %d, %d\n", NTEContext, Err); return; } } if (OptDel) { if ((Err = DeleteIPAddress(Context)) != 0) printf("DeleteIPAddress failed %d\n", Err); } } |
