两个半连接扫描程序源代码

第一个：

//这是别人写的一个半连接的扫描

//

#include <winsock2.h>

#include <ws2tcpip.h>

#include "mstcpip.h"

#include <stdio.h>

#pragma comment(lib,"ws2_32.lib")

////////////////////////////////////////////////////////////////

//全局变量

////////////////////////////////////////////////////////////////

#define srcPort 88

char srcIP[20] = ; //定义源地址 ----------->>>>>>>

char tgtIP[20] = ; //定义目的地址 -------------->>>>>>>

int portNow; //定义正在扫描的端口

//标准端口列表

int ports[20] =;

typedef struct ip_hdr

{

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

}IP_HEADER;

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

}TCP_HEADER;

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

}PSD_HEADER;

////////////////////////////////////////////////////////////////

//函数原形

////////////////////////////////////////////////////////////////

int send_packet(); //发送数据函数

int recv_packet(); //监听数据函数

USHORT checksum( USHORT *, int ); //计算检验和函数

void check_port( char * ); //判断端口是否开放函数

//////////////////////////////////////////////////////////////// ------------------------------

//main函数

////////////////////////////////////////////////////////////////

int main( int argc , char *argv[] )

{

int end;

WSADATA WSAData;

DWORD thread_ID = 1;

char FAR hostname[128] = ; //--------->>>>>>>>>>

HANDLE ThreadHandle[20];

struct hostent *phe;

if( argc != 2 )//检查命令行参数是否正确

{

usage( argv[0] );

exit( 0 );

}

if ( WSAStartup(MAKEWORD(2,2) , &WSAData) )

{

printf("WSAStartup Error...\n");

exit(0);

}

strcpy(tgtIP,argv[1]);//得到目标主机的ip地址

gethostname(hostname,128);//获取本机主机名

phe = gethostbyname(hostname);//获取本机ip地址结构

if(phe == NULL)

{

printf("Get LocalIP Error...\n");

}

strcpy(srcIP, inet_ntoa(*((struct in_addr *)phe->h_addr_list[0])));//得到本机ip地址

//调试用，注释掉

//printf("test\t%s\n",tgtIP);

//printf("test\t%s\n",srcIP);

//开启新线程，接受数据包，分析返回的信息

HANDLE RecvHandle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)recv_packet,NULL,0,&thread_ID);

Sleep(500);//休息一下再启动发送数据包函数

for(int tmp = 0; tmp < 20; tmp++)

{

++thread_ID;

//要扫描的端口

portNow = ports[tmp];

//开启新线程，发送数据包

ThreadHandle[tmp] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)send_packet,NULL,0,&thread_ID);

//防止生成线程过快，休息

Sleep(100);

}

DWORD WaitThread = WaitForMultipleObjects( 20 , ThreadHandle , TRUE , INFINITE );

if( WaitThread != WAIT_FAILED)

{

for( int n = 0 ; n < 20 ; n++ )

{

CloseHandle( ThreadHandle[n] );

}

}

CloseHandle( RecvHandle );

WSACleanup();

scanf("%d",&end);

return 0;

}

//---------------------------------------------------------------------功能函数

//发送数据包的函数

int send_packet()

{

SOCKET sendSocket;

BOOL flag;

int timeout;

SOCKADDR_IN sin;

IP_HEADER ipHeader;

TCP_HEADER tcpHeader;

PSD_HEADER psdHeader;

char szSendBuf[60] = {0}; //发送包的缓冲区

int ret;

unsigned long source_ip;

unsigned long target_ip;

//建立原生数据socket

if((sendSocket = WSASocket(AF_INET, SOCK_RAW, IPPROTO_RAW, NULL, 0, WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)

{

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

return 0;

}

//设置自己填充数据包

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

{

printf("Setsockopt IP_HDRINCL Error...\n");

return 0;

}

//设置超时时间

timeout = 1000;

if(setsockopt(sendSocket, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout)) == SOCKET_ERROR)

{

printf("Setsockopt SO_SNDTIMEO Error...\n");

return 0;

}

target_ip = inet_addr(tgtIP);

source_ip = inet_addr(srcIP);

sin.sin_family = AF_INET;

sin.sin_port = htons(portNow);

sin.sin_addr.S_un.S_addr = target_ip;

//填充IP首部

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

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

ipHeader.ident = 1;

ipHeader.frag_and_flags = 0x40;

ipHeader.ttl = 128;

ipHeader.proto = IPPROTO_TCP;

ipHeader.checksum = 0;

ipHeader.sourceIP = source_ip;//源IP

ipHeader.destIP = target_ip;//目的IP

//填充TCP首部

tcpHeader.th_dport = htons(portNow);//目的端口

tcpHeader.th_sport = htons(srcPort); //源端口

tcpHeader.th_seq = 0x12345678;

tcpHeader.th_ack = 0;

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

tcpHeader.th_flag = 2;//syn标志位。0,2,4,8,16,32->FIN,SYN,RST,PSH,ACK,URG（推测,哈哈）

tcpHeader.th_win = htons(512);

tcpHeader.th_urp = 0;

tcpHeader.th_sum = 0;

//填充tcp伪首部

psdHeader.saddr = ipHeader.sourceIP;

psdHeader.daddr = ipHeader.destIP;

psdHeader.mbz = 0;

psdHeader.ptcl = IPPROTO_TCP;

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

//计算TCP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));

//计算IP检验和

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));

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

//发送数据包

ret = sendto(sendSocket, szSendBuf, sizeof(ipHeader) + sizeof(tcpHeader), 0, (struct sockaddr*)&sin, sizeof(sin));

if(ret == SOCKET_ERROR)

{

printf("Send Packet Error...\n");

return 0;

}

else return 1;

}

//SINFFER函数

int recv_packet()

{

SOCKET sock;

SOCKADDR_IN sniff;

char recvBuffer[65000] = {0};//缓冲区存放捕获的数据

//建立socket监听数据包

sock = socket(AF_INET,SOCK_RAW,IPPROTO_IP);

sniff.sin_family = AF_INET;

sniff.sin_port = htons(0);

sniff.sin_addr.s_addr = inet_addr(srcIP);

//绑定到本地随机端口

bind(sock,(PSOCKADDR)&sniff,sizeof(sniff));

//设置SOCK_RAW为SIO_RCVALL，以便接收所有的IP包

//copy来的

DWORD dwBufferLen[10] ;

DWORD dwBufferInLen = 1 ;

DWORD dwBytesReturned = 0 ;

WSAIoctl(sock,SIO_RCVALL,&dwBufferInLen,sizeof(dwBufferInLen),&dwBufferLen,sizeof(dwBufferLen),&dwBytesReturned,NULL,NULL);

while(1)

{

memset(recvBuffer , 0 , sizeof(recvBuffer) );

//开始捕获数据包

int bytesRecived = recv(sock,recvBuffer,sizeof(recvBuffer),0);

if(bytesRecived <= 0)

{

break;

}

check_port(recvBuffer); //调用解包函数

}

return 1;

}

//解包函数

void check_port(char *buffer)

{

IP_HEADER *ipHeader;//IP_HEADER型指针

TCP_HEADER *tcpHeader;//TCP_HEADER型指针

ipHeader = (IP_HEADER *)buffer;

tcpHeader = (TCP_HEADER *) (buffer+sizeof(IP_HEADER));

if(ipHeader->sourceIP != inet_addr(tgtIP))

{

return;

}

for(int tmp=0;tmp<20;tmp++)

{

//SYN+ACK -> 2+16=18（也是推测，哈哈）

if(tcpHeader->th_flag == 18 && tcpHeader->th_sport == htons(ports[tmp]))

{

printf("[Found]\t%s\tport\t%d\tOpen\n",tgtIP,ports[tmp]);

}

}

}

//--------------------------------------------------------

//计算检验和函数，完全抄别人的

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);

}

第二个：

//半打开扫描源程序(for WIN2K)

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdio.h>

#include "mstcpip.h"

#pragma comment(lib,"ws2_32")

#define DEFAULT_DEST_PORT 5

#define DEST_HOST "www.hrbust.edu.cn"

#define SEQ 0x28376839

typedef struct _iphdr

{

unsigned char h_lenver; //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

}IP_HEADER;

typedef struct _tcphdr //定义TCP首部

{

USHORT th_sport; //16位源端口

USHORT th_dport; //16位目的端口

unsigned intth_seq; //32位序列号

unsigned intth_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

}TCP_HEADER;

struct //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

}psd_header;

SOCKET sockRaw = INVALID_SOCKET,

sockListen = INVALID_SOCKET;

struct sockaddr_indest;

//SOCK错误处理程序

void CheckSockError(int iErrorCode, char *pErrorMsg)

{

if(iErrorCode==SOCKET_ERROR)

{

printf("%s Error:%d\n", pErrorMsg, GetLastError());

closesocket(sockRaw);

ExitProcess(-1);

}

}

//计算检验和

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);

}

//IP解包程序

bool DecodeIPHeader(char *buf, int bytes)

{

IP_HEADER *iphdr;

TCP_HEADER *tcphdr;

unsigned shortiphdrlen;

iphdr = (IP_HEADER *)buf;

iphdrlen = sizeof(unsigned long) * (iphdr->h_lenver & 0xf);

tcphdr = (TCP_HEADER*)(buf + iphdrlen);

//是否来自目标IP

if(iphdr->sourceIP != dest.sin_addr.s_addr) return false;

//序列号是否正确

if((ntohl(tcphdr->th_ack) != (SEQ+1)) && (ntohl(tcphdr->th_ack) != SEQ)) return false;

//RST/ACK - 无服务

if(tcphdr->th_flag == 20)

{

printf(".\n");

return true;

}

//SYN/ACK - 扫描到一个端口

if(tcphdr ->th_flag == 18)

{

printf("%d\n",ntohs(tcphdr->th_sport));

return true;

}

return true;

}

//主函数

int main(int argc,char **argv)

{

int iErrorCode;

int datasize;

struct hostent *hp;

IP_HEADER ip_header;

TCP_HEADER tcp_header;

char SendBuf[128]={0};

char RecvBuf[65535]={0};

//初始化SOCKET

WSADATA wsaData;

iErrorCode = WSAStartup(MAKEWORD(2,2),&wsaData);

CheckSockError(iErrorCode, "WSAStartup()");

sockRaw = socket(AF_INET , SOCK_RAW , IPPROTO_IP);

CheckSockError(sockRaw, "socket()");

sockListen = socket(AF_INET , SOCK_RAW , IPPROTO_IP);

CheckSockError(sockListen, "socket");

//设置IP头操作选项

BOOL bOpt = true;

iErrorCode = setsockopt(sockRaw,IPPROTO_IP,IP_HDRINCL,(char *)&bOpt,sizeof(bOpt));

CheckSockError(iErrorCode, "setsockopt()");

//获得本地IP

SOCKADDR_IN sa;

unsigned char LocalName[256];

iErrorCode = gethostname((char*)LocalName,sizeof(LocalName)-1);

CheckSockError(iErrorCode, "gethostname()");

if((hp = gethostbyname((char*)LocalName)) == NULL)

{

CheckSockError(SOCKET_ERROR, "gethostbyname()");

}

memcpy(&sa.sin_addr.S_un.S_addr,hp->h_addr_list[0],hp->h_length);

sa.sin_family = AF_INET;

sa.sin_port = htons(7000);

iErrorCode = bind(sockListen, (PSOCKADDR)&sa, sizeof(sa));

CheckSockError(iErrorCode, "bind");

//设置SOCK_RAW为SIO_RCVALL，以便接收所有的IP包

DWORD dwBufferLen[10] ;

DWORD dwBufferInLen = 1 ;

DWORD dwBytesReturned = 0 ;

iErrorCode=WSAIoctl(sockListen, SIO_RCVALL,&dwBufferInLen, sizeof(dwBufferInLen),

&dwBufferLen, sizeof(dwBufferLen),&dwBytesReturned , NULL , NULL );

CheckSockError(iErrorCode, "Ioctl");

//获得目标主机IP

memset(&dest,0,sizeof(dest));

dest.sin_family = AF_INET;

dest.sin_port = htons(DEFAULT_DEST_PORT);

if((dest.sin_addr.s_addr = inet_addr(DEST_HOST)) == INADDR_NONE)

{

if((hp = gethostbyname(DEST_HOST)) != NULL)

{

memcpy(&(dest.sin_addr),hp->h_addr_list[0],hp->h_length);

dest.sin_family = hp->h_addrtype;

printf("dest.sin_addr = %s\n",inet_ntoa(dest.sin_addr));

}

else

{

CheckSockError(SOCKET_ERROR, "gethostbyname()");

}

}

//填充IP首部

ip_header.h_lenver=(4<<4 | sizeof(ip_header)/sizeof(unsigned long));

//高四位IP版本号，低四位首部长度

ip_header.total_len=htons(sizeof(IP_HEADER)+sizeof(TCP_HEADER)); //16位总长度（字节）

ip_header.ident=1; //16位标识

ip_header.frag_and_flags=0; //3位标志位

ip_header.ttl=128; //8位生存时间TTL

ip_header.proto=IPPROTO_TCP; //8位协议(TCP,UDP…)

ip_header.checksum=0; //16位IP首部校验和

ip_header.sourceIP=sa.sin_addr.s_addr; //32位源IP地址

ip_header.destIP=dest.sin_addr.s_addr; //32位目的IP地址

//填充TCP首部

tcp_header.th_sport=htons(7000); //源端口号

tcp_header.th_dport=htons(DEFAULT_DEST_PORT); //目的端口号

tcp_header.th_seq=htonl(SEQ); //SYN序列号

tcp_header.th_ack=0; //ACK序列号置为0

tcp_header.th_lenres=(sizeof(TCP_HEADER)/4<<4|0); //TCP长度和保留位

tcp_header.th_flag=2; //SYN 标志

tcp_header.th_win=htons(16384); //窗口大小

tcp_header.th_urp=0; //偏移

tcp_header.th_sum=0; //校验和

//填充TCP伪首部（用于计算校验和，并不真正发送）

psd_header.saddr=ip_header.sourceIP;

psd_header.daddr=ip_header.destIP;

psd_header.mbz=0;

psd_header.ptcl=IPPROTO_TCP;

psd_header.tcpl=htons(sizeof(tcp_header));

//计算TCP校验和，计算校验和时需要包括TCP pseudo header

memcpy(SendBuf,&psd_header,sizeof(psd_header));

memcpy(SendBuf+sizeof(psd_header),&tcp_header,sizeof(tcp_header));

tcp_header.th_sum=checksum((USHORT *)SendBuf,sizeof(psd_header)+sizeof(tcp_header));

//计算IP校验和

memcpy(SendBuf,&ip_header,sizeof(ip_header));

memcpy(SendBuf+sizeof(ip_header),&tcp_header,sizeof(tcp_header));

memset(SendBuf+sizeof(ip_header)+sizeof(tcp_header),0,4);

datasize=sizeof(ip_header)+sizeof(tcp_header);

ip_header.checksum=checksum((USHORT *)SendBuf,datasize);

//填充发送缓冲区

memcpy(SendBuf,&ip_header,sizeof(ip_header));

//发送TCP报文

iErrorCode=sendto(sockRaw,SendBuf,datasize,0,(struct sockaddr*) &dest,

sizeof(dest));

CheckSockError(iErrorCode, "sendto()");

//接收数据

DWORD timeout = 2000;

DWORD start = GetTickCount();

while(true)

{

//计时,2s超时

if((GetTickCount() - start) >= timeout) break;

memset(RecvBuf, 0, sizeof(RecvBuf));

iErrorCode = recv(sockListen, RecvBuf, sizeof(RecvBuf), 0);

CheckSockError(iErrorCode, "recv");

if(DecodeIPHeader(RecvBuf,iErrorCode)) break;

}

//退出前清理

if(sockRaw != INVALID_SOCKET) closesocket(sockRaw);

WSACleanup();

return 0;

}

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