用 winpcap 发过 syn 数据包
我用winpcap发过syn数据包，但对方收不到。以太网头上我填的是我本机MAC地址和对方MAC地址，对方为什么收不大？？？？？？
#include <stdlib.h>
#include <stdio.h>
#include <winsock2.h>
#include <pcap.h>
#pragma comment(lib, "wpcap.lib")
#pragma comment(lib, "ws2_32.lib")
typedef struct _ETHER_HEADER{
u_char et_dhost[6];
u_char et_shost[6];
u_short et_type; //如果上一层为IP协议。则ether_type的值就是0x0800
} ETHER_HEADER;
typedef struct _IP_HEADER
{
unsigned char h_verlen;
unsigned char tos; //type of service
unsigned short total_len;
unsigned short ident;
unsigned short frag_and_flags;
unsigned char ttl;
unsigned char proto;
unsigned short checksum;
unsigned int sourceIP;
unsigned int destIP;
} IP_HEADER;
typedef struct _TCP_HEADER
{
USHORT th_sport;
USHORT th_dport;
unsigned int th_seq;
unsigned int th_ack;
unsigned char th_lenres;
unsigned char th_flag;
USHORT th_win;
USHORT th_sum;
USHORT th_urp;
} TCP_HEADER;
typedef struct _psdhdr
{
unsigned long saddr; //Source IP address; 32 bits
unsigned long daddr; //Destination IP address; 32 bits
unsigned char mbz; //padding
unsigned char ptcl; //Protocol; 8 bits
unsigned short tcpl; //TCP length; 16 bits
}PSDTCP_HEADER ;
USHORT CheckSum(USHORT *buffer, int size)
{
unsigned long cksum = 0;
while (size > 1)
{
cksum += *buffer++;
size -= sizeof(USHORT);
}
if (size)
{
cksum += *(UCHAR*)buffer;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);
return (USHORT)(~cksum);
}
int main( )
{
IP_HEADER ipHeader;
TCP_HEADER tcpHeader;
PSDTCP_HEADER psdHeader;
ETHER_HEADER etherHeader;
char szSrcIp[] = "60.176.42.45";
char szDstIp[] = "60.12.8.117";
char *g_BehindString = "just a test";
memset( &ipHeader, 0, sizeof ipHeader );
memset( &tcpHeader, 0, sizeof tcpHeader );
memset( &psdHeader, 0, sizeof psdHeader );
memset( ðerHeader, 0, sizeof etherHeader );
ipHeader.h_verlen = (4<<4 | sizeof ipHeader / sizeof(unsigned long));//高四位IP版本号，低四位首部长度
ipHeader.total_len = htons( sizeof ipHeader + sizeof tcpHeader + strlen( g_BehindString ) );//16位总长度（字节）
ipHeader.ident = 0x14BB;//16位标识
ipHeader.frag_and_flags = 0x0040;//3位标志位
ipHeader.ttl = 128;//8位生存时间TTL
ipHeader.proto = IPPROTO_TCP;//8位协议(TCP,UDP…)
ipHeader.checksum = 0;//16位IP首部校验和
ipHeader.sourceIP = inet_addr( szSrcIp );//32位源IP地址
ipHeader.destIP = inet_addr( szDstIp );//32位目的IP地址
//填充TCP伪首部（用于计算校验和，并不真正发送）
psdHeader.saddr = ipHeader.sourceIP;
psdHeader.daddr = ipHeader.destIP; //目的地址
psdHeader.mbz = 0;
psdHeader.ptcl = IPPROTO_TCP; //协议类型
psdHeader.tcpl = htons( sizeof tcpHeader ); //TCP首部长度
unsigned char ucSrcMac[6] = { 0x64, 0x27, 0x37, 0x7D, 0XF7, 0X72 };
unsigned char ucDstMac[6] = { 0x88, 0x9F, 0xFA, 0xFD, 0xF4, 0XF2 };
memcpy( etherHeader.et_dhost, &ucDstMac, sizeof ucDstMac );
memcpy( etherHeader.et_shost, &ucSrcMac, sizeof ucSrcMac );
etherHeader.et_type = 0x0008;
char ucSend[1600];
int datasize;
//----------------Send SYN Packet----------------
//计算TCP校验和
memset( ucSend, 0, sizeof ucSend);
memcpy( ucSend, &psdHeader,sizeof psdHeader );
memcpy( ucSend + sizeof psdHeader, &tcpHeader, sizeof tcpHeader );
memcpy( ucSend + sizeof psdHeader + sizeof tcpHeader, g_BehindString, strlen( g_BehindString ) );
tcpHeader.th_sum = CheckSum((USHORT *)ucSend, sizeof psdHeader + sizeof tcpHeader + strlen( g_BehindString ) );
tcpHeader.th_sum = htons( ntohs( tcpHeader.th_sum ) - (USHORT)strlen(g_BehindString));
//计算IP校验和
memset( ucSend, 0, sizeof ucSend );
memcpy( ucSend, &ipHeader,sizeof ipHeader);
memcpy( ucSend + sizeof ipHeader, &tcpHeader, sizeof tcpHeader );
memset( ucSend + sizeof ipHeader +sizeof tcpHeader, 0, 4 );
ipHeader.checksum = CheckSum((USHORT *)ucSend,sizeof ipHeader );
//填充发送缓冲区
memset( ucSend, 0, sizeof ucSend );
memcpy( ucSend, ðerHeader ,sizeof etherHeader );
memcpy( ucSend + sizeof etherHeader, &ipHeader, sizeof ipHeader );
memcpy( ucSend + sizeof etherHeader + sizeof ipHeader, &tcpHeader, sizeof tcpHeader );
memcpy( ucSend + sizeof etherHeader + sizeof ipHeader + sizeof tcpHeader, g_BehindString, strlen(g_BehindString) );
datasize = sizeof ipHeader + sizeof tcpHeader + sizeof etherHeader + strlen( g_BehindString );
char *device = "//Device//NPF_{0757BB69-9F82-4C2C-BC18-0FE59116B466}";
//char *device = "//Device//NPF_{695C0D4A-88B4-451F-9945-E9CF3C994E42}";
char errbuf[PCAP_ERRBUF_SIZE] = { 0 };
pcap_t *adhandle = pcap_open( device, 0x10000, PCAP_OPENFLAG_PROMISCUOUS, 1000, NULL, errbuf );
if ( NULL == adhandle )
{
printf("[pcap_open error] : %s/n", errbuf);
return 0;
}
while(1)
if ( 0 != pcap_sendpacket(adhandle, (const unsigned char *)ucSend, datasize ) )
{
printf("send failed.\n");
}
else
{
printf("send success.\n");
}
system("pause");
return 0;
}
程序代码：