用SendARP()获取对方的MAC地址

使用SendARP()函数，发送ARP请求，以获取对方的MAC地址。

/* sendarp.c  * Link with wsock32.lib and iphlpapi.lib  */#pragma comment(lib,"iphlpapi.lib")#pragma comment(lib,"wsock32.lib")#include <winsock2.h>#include <iphlpapi.h>#include <stdio.h>void usage(char *pname){printf("Usage: %s [options] ip-address\n", pname);printf("\t -h \t\thelp\n");printf("\t -s src-ip \tsource IP address\n");exit(1);}int __cdecl main(int argc, char **argv){    DWORD dwRetVal = 0;    IPAddr DestIp = 0;    IPAddr SrcIp = 0; /* default for src ip */ULONG MacAddr[2] = {0}; /* for 6-byte hardware addresses */    ULONG PhysAddrLen = 6; /* default to length of six bytes */    char *DestIpString = NULL;    char *SrcIpString = NULL;    BYTE *bPhysAddr;    int i;    if (argc > 1) {        for (i = 1; i < argc; i++) {            if ((argv[i][0] == '-') || (argv[i][0] == '/')) {                switch (tolower(argv[i][1])) {                case 's':                    SrcIpString = argv[++i];                    SrcIp = inet_addr(SrcIpString);                    break;                case 'h':                default:                    usage(argv[0]);                    break;                }/* end switch */            } else{                DestIpString = argv[i];}        }/* end for */    }else{        usage(argv[0]);}    if (DestIpString == NULL || DestIpString[0] == '\0'){        usage(argv[0]);}    DestIp = inet_addr(DestIpString);printf("Sending ARP request for IP address: %s\n", DestIpString);PhysAddrLen = sizeof(MacAddr);memset(&MacAddr, 0xff, sizeof (MacAddr));    dwRetVal = SendARP(DestIp, SrcIp, &MacAddr, &PhysAddrLen);    if (dwRetVal == NO_ERROR) {        bPhysAddr = (BYTE *) &MacAddr;        if (PhysAddrLen) {            for (i = 0; i < (int) PhysAddrLen; i++) {                if (i == (PhysAddrLen - 1)){                    printf("%.2X\n", (int) bPhysAddr[i]);}                else{                    printf("%.2X-", (int) bPhysAddr[i]);}            }        }else{            printf("Warning: SendArp completed successfully, but returned length=0\n");}    } else {        printf("Error: SendArp failed with error: %d", dwRetVal);        switch (dwRetVal){        case ERROR_GEN_FAILURE:            printf(" (ERROR_GEN_FAILURE)\n");            break;        case ERROR_INVALID_PARAMETER:            printf(" (ERROR_INVALID_PARAMETER)\n");            break;        case ERROR_INVALID_USER_BUFFER:            printf(" (ERROR_INVALID_USER_BUFFER)\n");            break;        case ERROR_BAD_NET_NAME:            printf(" (ERROR_GEN_FAILURE)\n");            break;        case ERROR_BUFFER_OVERFLOW:            printf(" (ERROR_BUFFER_OVERFLOW)\n");            break;        case ERROR_NOT_FOUND:            printf(" (ERROR_NOT_FOUND)\n");            break;        default:            printf("\n");            break;        }    }    return 0;}

经测试，无法获取127.0.0.1的MAC地址，可以获取正常IP的MAC地址：
E:\>sendarp 172.16.27.38
Sending ARP request for IP address: 172.16.27.38
E8-9A-8F-F9-3C-D2