网络套接字的问题，请大家帮忙看看

gaslinux 2011-08-13 11:40:08



// test123.cpp : 定义控制台应用程序的入口点。

//



#include "stdafx.h"

#include <stdio.h> 

#include <winsock2.h> 

#include <ws2tcpip.h> 



#define SOURCE_PORT 7234 

#define MAX_RECEIVEBYTE 255 



#pragma comment(lib,"Ws2_32.lib") 



typedef struct ip_hdr //定义IP首部 

{ 

unsigned char h_verlen; //4位首部长度,4位IP版本号 

unsigned char tos; //8位服务类型TOS 

unsigned short total_len; //16位总长度（字节） 

unsigned short ident; //16位标识 

unsigned short frag_and_flags; //3位标志位 

unsigned char ttl; //8位生存时间 TTL 

unsigned char proto; //8位协议 (TCP, UDP 或其他) 

unsigned short checksum; //16位IP首部校验和 

unsigned int sourceIP; //32位源IP地址 

unsigned int destIP; //32位目的IP地址 

}IPHEADER; 



typedef struct tsd_hdr //定义TCP伪首部 

{ 

unsigned long saddr; //源地址 

unsigned long daddr; //目的地址 

char mbz; 

char ptcl; //协议类型 

unsigned short tcpl; //TCP长度 

}PSDHEADER; 



typedef struct tcp_hdr //定义TCP首部 

{ 

USHORT th_sport; //16位源端口 

USHORT th_dport; //16位目的端口 

unsigned int th_seq; //32位序列号 

unsigned int th_ack; //32位确认号 

unsigned char th_lenres; //4位首部长度/6位保留字 

unsigned char th_flag; //6位标志位 

USHORT th_win; //16位窗口大小 

USHORT th_sum; //16位校验和 

USHORT th_urp; //16位紧急数据偏移量 

}TCPHEADER; 



//CheckSum:计算校验和的子函数 

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(int argc, char* argv[]) 

{ 

WSADATA WSAData; 

SOCKET sock; 

SOCKADDR_IN addr_in; 

IPHEADER ipHeader; 

TCPHEADER tcpHeader; 

PSDHEADER psdHeader; 



char szSendBuf[60]={0}; 

BOOL flag; 

int rect,nTimeOver; 



if (WSAStartup(MAKEWORD(2,2), &WSAData)!=0) 

{ 

printf("WSAStartup Error!\n"); 

return false; 

} 



if ((sock=WSASocket(AF_INET,SOCK_RAW,IPPROTO_IP,NULL,0,WSA_FLAG_OVERLAPPED))==INVALID_SOCKET) 

{ 

printf("Socket Setup Error!\n"); 

return false; 

} 

flag=true; 

if (setsockopt(sock,IPPROTO_IP, IP_HDRINCL,(char *)&flag,sizeof(flag))==SOCKET_ERROR) 

{ 

printf("setsockopt IP_HDRINCL error!\n"); 

return false; 

} 



nTimeOver=1000; 

if (setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (char*)&nTimeOver, sizeof(nTimeOver))==SOCKET_ERROR) 

{ 

printf("setsockopt SO_SNDTIMEO error!\n"); 

return false; 

} 

addr_in.sin_family=AF_INET; 

addr_in.sin_port=htons(8080); 

addr_in.sin_addr.S_un.S_addr=inet_addr("192.168.137.94"); 



// 

// 

//填充IP首部 

ipHeader.h_verlen=(4<<4 | sizeof(ipHeader)/sizeof(unsigned long)); 

// ipHeader.tos=0; 

ipHeader.total_len=htons(sizeof(ipHeader)+sizeof(tcpHeader)); 

ipHeader.ident=1; 

ipHeader.frag_and_flags=0; 

ipHeader.ttl=128; 

ipHeader.proto=IPPROTO_TCP; 

ipHeader.checksum=0; 

ipHeader.sourceIP=inet_addr("192.168.137.1"); 

ipHeader.destIP=inet_addr(argv[1]); 



//填充TCP首部 

tcpHeader.th_dport=htons(8080); 

tcpHeader.th_sport=htons(SOURCE_PORT); //源端口号 

tcpHeader.th_seq=htonl(0x12345678); 

tcpHeader.th_ack=0; 

tcpHeader.th_lenres=(sizeof(tcpHeader)/4<<4|0); 

tcpHeader.th_flag=2; //修改这里来实现不同的标志位探测，2是SYN，1是FIN，16是ACK探测 等等 

tcpHeader.th_win=htons(512); 

tcpHeader.th_urp=0; 

tcpHeader.th_sum=0; 



psdHeader.saddr=ipHeader.sourceIP; 

psdHeader.daddr=ipHeader.destIP; 

psdHeader.mbz=0; 

psdHeader.ptcl=IPPROTO_TCP; 

psdHeader.tcpl=htons(sizeof(tcpHeader)); 



//计算校验和 

memcpy(szSendBuf, &psdHeader, sizeof(psdHeader)); 

memcpy(szSendBuf+sizeof(psdHeader), &tcpHeader, sizeof(tcpHeader)); 

tcpHeader.th_sum=checksum((USHORT *)szSendBuf,sizeof(psdHeader)+sizeof(tcpHeader)); 



memcpy(szSendBuf, &ipHeader, sizeof(ipHeader)); 

memcpy(szSendBuf+sizeof(ipHeader), &tcpHeader, sizeof(tcpHeader)); 

memset(szSendBuf+sizeof(ipHeader)+sizeof(tcpHeader), 0, 4); 

ipHeader.checksum=checksum((USHORT *)szSendBuf, sizeof(ipHeader)+sizeof(tcpHeader)); 



memcpy(szSendBuf, &ipHeader, sizeof(ipHeader)); 



rect=sendto(sock, szSendBuf, sizeof(ipHeader)+sizeof(tcpHeader), 

0, (struct sockaddr*)&addr_in, sizeof(addr_in)); 

if (rect==SOCKET_ERROR) 

{ 

printf("send error!:%d\n",WSAGetLastError()); 

return false; 

} 

else 

printf("send ok!\n"); 





getchar();



closesocket(sock); 

WSACleanup(); 



return 0; 

}