📄 tcpsynscan.cpp
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#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <time.h>
#include "mstcpip.h"
#pragma comment(lib,"ws2_32.lib")
#define SEQ 0x27456737 // 伪造的序列号
SOCKET sockRaw; // 发送SYN扫描数据包套接字
SOCKET sockListen; // 监听目标主机返回数据包套接字
struct sockaddr_in targethost; // 目标主机地址结构
BOOL ScanFIN=FALSE; // 是否扫描完毕
char TargetIP[20]; // 目标机IP地址
int TargetPort; // 目标机起始端口
int TargetPortEnd; // 目标机结束端口
int ProgressTag=0; // 进度条标志位
// 定义IP首部格式
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;
//定义TCP首部格式
typedef struct _tcphdr
{
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;
// 定义TCP伪首部格式
struct
{
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;
void usage(void)
{
printf("\tusage: TCPSYNScan [IP | DomainName] [StartPort-EndPort] \n");
printf("\tExample: TCPSYNScan www.sohu.com 1-139\n");
printf("\tExample: TCPSYNScan 192.168.0.1 1-1024\n");
}
void ParseCmd(int argc,char **argv)
{
char *p;
if(argc!=3)
{
usage();
ExitProcess(-1);
}
// 提取端口参数
p=argv[2];
if(strstr(argv[2],"-"))
{ TargetPort=atoi(argv[2]);
for(;*p;)
if(*(p++)=='-')
{
break;
}
TargetPortEnd=atoi(p);
if(TargetPort<1 || TargetPortEnd>65535)
{
printf("端口范围错误(1-65535) ！\n");
ExitProcess(-1);
}
}
// 设置目标机IP地址
strcpy(TargetIP,argv[1]);
}
//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 DecodeIPPack(char *buf, int bytes)
{
IP_HEADER *iphdr;
TCP_HEADER *tcphdr;
unsigned short iphdrlen;
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 != targethost.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;
}
// 18表示 SYN/ACK
if(tcphdr ->th_flag == 18)
{
printf("端口 %5d 开放！ \n",ntohs(tcphdr->th_sport));
return true;
}
return true;
}
//接收数据包线程函数
DWORD WINAPI RecvThread(LPVOID para)
{
int iErrorCode;
struct hostent *hp;
char RecvBuf[65535]={0};
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];
// 获取主机信息
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 ;
// 设置套接字接收全部数据包
iErrorCode=WSAIoctl(sockListen, SIO_RCVALL,
&dwBufferInLen, sizeof(dwBufferInLen),
&dwBufferLen, sizeof(dwBufferLen),
&dwBytesReturned , NULL , NULL );
CheckSockError(iErrorCode, "Ioctl");
memset(RecvBuf, 0, sizeof(RecvBuf));
//接收数据
for(;;)
{
iErrorCode = recv(sockListen, RecvBuf, sizeof(RecvBuf), 0);
DecodeIPPack(RecvBuf,iErrorCode); // 解析IP数据包
}
if(ScanFIN)
{
closesocket(sockListen);
return 0;
}
}
// 定义状态提示函数
void ProgressShow(void)
{
// 进度条
char *progressbar[12]=
{
" | ",
" / ",
" - ",
" \\ ",
" | ",
" / ",
" - ",
" \\ ",
" | ",
" / ",
" - ",
" \\ ",
};
printf(" =%s=\r", progressbar[ProgressTag]);
ProgressTag=(ProgressTag==11)?0:ProgressTag+1;
Sleep(2);
}
//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};
ParseCmd(argc, argv);
WSADATA wsaData;
// 初始化Winsock库
iErrorCode = WSAStartup(MAKEWORD(2,2),&wsaData);
CheckSockError(iErrorCode, "WSAStartup()");
// 创建发送数据包套接字
sockRaw = socket(AF_INET , SOCK_RAW , IPPROTO_IP);
CheckSockError(sockRaw, "socket()");
// 创建接收数据包套接字
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()");
}
// 设置本地地址结构
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);
// 绑定套接字
iErrorCode = bind(sockListen, (PSOCKADDR)&sa, sizeof(sa));
CheckSockError(iErrorCode, "bind");
//获得目标主机IP
memset(&targethost,0,sizeof(targethost));
targethost.sin_family = AF_INET;
targethost.sin_port = htons(TargetPort);
if((targethost.sin_addr.s_addr = inet_addr(TargetIP)) == INADDR_NONE)
{
if((hp = gethostbyname(TargetIP)) != NULL)
{
memcpy(&(targethost.sin_addr),hp->h_addr_list[0],hp->h_length);
targethost.sin_family = hp->h_addrtype;
printf("targethost.sin_addr = %s\n",inet_ntoa(targethost.sin_addr));
}
else
{
CheckSockError(SOCKET_ERROR, "gethostbyname()");
}
}
//开启监听线程
HANDLE Thread=CreateThread(NULL,0,RecvThread,0,0,0);
//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=targethost.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_lenres=(sizeof(TCP_HEADER)/4<<4|0); //TCP长度和保留位
tcp_header.th_win=htons(16384);
//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));
Sleep(500);
printf("\n");
printf("开始扫描主机 %s 端口范围 %d-%d \n\n",TargetIP,TargetPort,TargetPortEnd);
DWORD dwStart=GetTickCount();//开始计时
for(;TargetPort<TargetPortEnd;TargetPort++)
{
ProgressShow();
tcp_header.th_dport=htons(TargetPort); //目的端口号
tcp_header.th_ack=0; //ACK序列号置为0
tcp_header.th_flag=2; //SYN 标志
tcp_header.th_seq=htonl(SEQ); //SYN序列号
tcp_header.th_urp=0; //偏移
tcp_header.th_sum=0; //校验和
//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*) &targethost,
sizeof(targethost));
CheckSockError(iErrorCode, "sendto()");
}
DWORD dwEnd=GetTickCount();//计时结束
ScanFIN=TRUE;
printf("\n关闭线程.....\n\n");
// 等待线程退出
WaitForSingleObject(Thread,5000);
CloseHandle(Thread);
printf("端口扫描消耗时间 : %d ms ",dwEnd-dwStart);//显示耗时
//关闭套接字，释放相关资源
if(sockRaw != INVALID_SOCKET)
{
closesocket(sockRaw);
}
WSACleanup();
return 0;
} ⌨️ 快捷键说明
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