想改ping的原地址

来源：互联网发布：淘宝客查不到佣金编辑：程序博客网时间：2024/05/05 17:57

我最近要写一个程序，用到要写一个自己的ping程序，而且要改变发出去的数据报的原地址，参看的csdn里不少文章，但由于我水品有限，现在实现起来还是有困难，第一次写文章求救，希望大家帮忙！谢谢！

在我不自己填写ip头时，程序还能正常ping通，但是我尝试着自己填充ip头后,就ping不了了！

ip头的数据结构

typedef struct ip_hdr
{
unsigned char ip_verlen;
unsigned char ip_tos;
unsigned short ip_totallength;
unsigned short ip_id;
unsigned short ip_offset;
unsigned char ip_ttl;
unsigned char ip_protocol;
unsigned short ip_checksum;
unsigned int ip_srcaddr;
unsigned int ip_destaddr;
}IPHDR, *PIPHDR;

icmp数据结构

typedef struct tagICMPHDR
{
unsigned char Type;   // Type
unsigned char Code;   // Code
u_short Checksum; // Checksum
u_short ID;    // Identification
u_short Seq;   // Sequence
unsigned char Data;   // Data
}ICMPHDR, *PICMPHDR;

#define REQ_DATASIZE 32 // Echo Request Data size

// ICMP Echo Request
typedef struct tagECHOREQUEST
{
ICMPHDR icmpHdr;
DWORD dwTime;
unsigned char cData[REQ_DATASIZE];
}ECHOREQUEST, *PECHOREQUEST;

// ICMP Echo Reply
typedef struct tagECHOREPLY
{
IPHDR ipHdr;
ECHOREQUEST echoRequest;
unsigned char cFiller[256];
}ECHOREPLY, *PECHOREPLY;

我就不全放上程序了，选重要的。

bool bOpt=true;
setsockopt(rawSocket, IPPROTO_IP, IP_HDRINCL, (char*)bOpt, sizeof(bOpt));//选择自己填充ip头

我这样填充

myIPHead.ip_totallength=htons(sizeof(IPHDR)+sizeof(ECHOREQUEST));
int ipsize=sizeof(IPHDR)/sizeof(unsigned long);
myIPHead.ip_verlen=ipsize;
myIPHead.ip_tos=0;
myIPHead.ip_id=0;
myIPHead.ip_offset=0;
myIPHead.ip_ttl=128;
myIPHead.ip_protocol=IPPROTO_ICMP;
myIPHead.ip_checksum=0;
myIPHead.ip_srcaddr=inet_addr("211.65.86.107");
myIPHead.ip_destaddr=inet_addr("211.65.86.105");

然后计算ip的校验和

myIPHead.ip_checksum=in_cksum((u_short *)&myIPHead, sizeof(myIPHead));

icmp部分是用了一个现成的,不会有问题的

echoReq.icmpHdr.Type = ICMP_ECHOREQ;
echoReq.icmpHdr.Code = 0;
echoReq.icmpHdr.Checksum = 0;
echoReq.icmpHdr.ID = nId++;
echoReq.icmpHdr.Seq = nSeq++;

// Fill in some data to send
for (nRet = 0; nRet < REQ_DATASIZE; nRet++)
echoReq.cData[nRet] = ' '+nRet;

// Save tick count when sent
echoReq.dwTime = GetTickCount();

// Put data in packet and compute checksum
echoReq.icmpHdr.Checksum = in_cksum((u_short *)&echoReq, sizeof(ECHOREQUEST));

填充一个buffer，准备发送。
memcpy(szSendBuf,&myIPHead,sizeof(myIPHead));
memcpy(szSendBuf+sizeof(myIPHead),&echoReq,sizeof(ECHOREQUEST));
sendSize=sizeof(myIPHead)+sizeof(echoReq);

nRet = sendto(s,      /* socket */
      (LPSTR)szSendBuf,   /* buffer */
      sendSize，
      0,       /* flags */
      (LPSOCKADDR)lpstToAddr, /* destination */
     sizeof(SOCKADDR_IN));   /* address length */

但是不行，根本受不到回应,而且我查看arp表，根本没有对方机子的ip mac记录，希望大家帮我看看源代码，指出错误，不胜感激！