如何获取局域网内其他主机的ip地址和mac地址

sallan 2010-08-31 03:15:16

大家好，最近刚开始学网络编程，写了一个简单的TCP程序，
想知道如何在局域网中获得其他主机的ip地址和mac地址
最好是有代码解读，谢谢。

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dage_01 2010-09-27

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接分

孤必有邻 2010-09-02

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我的方法是：循环向每一个可能的IP发送ICMP协议包（这个还是蛮快的，一个网段只要1秒就发完了），存在的IP会回复数据包（这个过程有点慢，几十秒吧），从而知道存在的主机IP，在进一步获取MAC。
（贴点提示性代码）
——接收（一个线程）
SOCKET sock;
sock = WSASocket( AF_INET, SOCK_RAW, IPPROTO_ICMP, NULL, 0, 0 );
if (sock==SOCKET_ERROR)
{
text.Format("WSASocket Fail: ErrCode=%d", WSAGetLastError());
pDlg->SetWindowText(text);
}
else
{
struct sockaddr_in addr;
addr.sin_family=AF_INET;
addr.sin_port=0;
addr.sin_addr.s_addr=htonl(INADDR_ANY);
//Bind to a useful port.
if(bind(sock,(LPSOCKADDR)&addr,sizeof(addr))==SOCKET_ERROR)
{
closesocket(sock);
return WSAGetLastError();
}
else
{
char buf[64];
int nBytesRead;
struct sockaddr_in from;
int nFromLen = sizeof(from);
SetThreadPriority( GetCurrentThread(), THREAD_PRIORITY_HIGHEST );
while (g_bStarted)
{
nBytesRead = recvfrom(sock,buf,64,0,(struct sockaddr*)&from,&nFromLen);
if (nBytesRead == SOCKET_ERROR)
{
if (WSAGetLastError() == WSAETIMEDOUT)
{
continue;
}
sprintf(buf,"recvfrom failed: %d",WSAGetLastError());
pDlg->SetWindowText(buf);
}
else
{
// 接收成功，处理数据
IpHeader *iphdr = NULL;
IcmpHeader *icmphdr = NULL;
USHORT iphdrlen;
iphdr = (IpHeader *)buf;
iphdrlen = iphdr->h_len * 4 ; // number of 32-bit words *4 = bytes
icmphdr = (IcmpHeader*)(buf + iphdrlen);

pDlg->m_list.AddString( inet_ntoa(from.sin_addr) );
}
}
shutdown( sock, SD_SEND );
closesocket( sock );
}
}
——发送（可以是主线程）
SOCKET sock;
sock = WSASocket( AF_INET, SOCK_RAW, IPPROTO_ICMP, NULL, 0, 0 );
for (int i=nMin, nCount=1; i<nMax && g_bStartedSend; i++)
{
for (int j=1; j<255; j++, nCount++)
{
sprintf( ip, "%d.%d.%d.%d", nFirst, nSecond, i, j );
addr=inet_addr(ip);
dest.sin_addr.s_addr=addr;
dest.sin_family=AF_INET;
// 填充数据
IcmpHeader *icmp;
icmp=(IcmpHeader*)buf;
icmp->i_type=ICMP_ECHO;
icmp->i_code=0;
icmp->i_id=(USHORT)sock;
icmp->i_cksum=0;
icmp->i_seq=0;
memset(icmp+sizeof(IcmpHeader), 'E', 32);
// 调整数据
icmp->i_cksum=0;
icmp->timestamp=GetTickCount();
icmp->i_seq=0;
icmp->i_cksum=checksum((USHORT*)icmp, datasize);
// 发送数据
if (sendto(sock, (char*)icmp, datasize, 0, (struct sockaddr*)&dest, sizeof dest) == SOCKET_ERROR)
{
text.Format("sendto fail: ErrCode=%d", WSAGetLastError());
pDlg->SetWindowText(text);
}
// 显示信息
pDlg->SetDlgItemText( IDC_EDIT1, ip );
addr = (GetTickCount()-dwStartTime+500) / 1000;
sprintf( ip, "%02d:%02d:%02d", addr/3600, (addr%3600)/60, addr%60 );
pDlg->SetDlgItemText( IDC_EDIT2, ip );
sprintf( ip, "%d", nCount);
pDlg->SetDlgItemText( IDC_EDIT3, ip );
if (!bFast) Sleep(1);
}
}
shutdown( sock, SD_SEND );
closesocket( sock );

m_tornado 2010-09-01

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已经很详细了~

这不是鸭头 2010-09-01

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#include <windows.h>

#include <stdio.h>

#include <tchar.h>

#include <iphlpapi.h>





int __cdecl main()

{

    HRESULT hr;

    IPAddr  ipAddr;

    ULONG   pulMac[2];

    ULONG   ulLen;



    ipAddr = inet_addr ("216.145.25.31");

    memset (pulMac, 0xff, sizeof (pulMac));

    ulLen = 6;

    

    hr = SendARP (ipAddr, 0, pulMac, &ulLen);

    printf ("Return %08x, length %8d\n", hr, ulLen);

    

    size_t i, j;

    char * szMac = new char[ulLen*3];

    PBYTE pbHexMac = (PBYTE) pulMac;



    //

    // Convert the binary MAC address into human-readable

    //

    for (i = 0, j = 0; i < ulLen - 1; ++i) {

        j += sprintf (szMac + j, "%02X:", pbHexMac[i]);

    }

    

    sprintf (szMac + j, "%02X", pbHexMac[i]);

    printf ("MAC address %s\n", szMac);

    

    delete [] szMac;



    return 0;

}

thehunters 2010-09-01

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char szDestIP[] = "192.168.0.23";

// 发送ARP请求
u_char arDestMac[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
ULONG ulLen = 6;
if(::SendARP(::inet_addr(szDestIP), 0, (ULONG*)arDestMac, &ulLen) == NO_ERROR)
{
// 打印出结果
u_char *p = arDestMac;
printf(" pEtherh->shost: %02X-%02X-%02X-%02X-%02X-%02X \n", p[0], p[1], p[2], p[3], p[4], p[5]);
}