高级扫描技术及原理介绍

  1<stdio.h>   
  2#include <winsock2.h>   
  3#include <ws2tcpip.h>
  4
  5  
  6#define SOURCE_PORT 7234   
  7#define MAX_RECEIVEBYTE 255 
  8
  9  
 10typedef struct ip_hdr //定义IP首部   
 11{   
 12unsigned char h_verlen; //4位首部长度,4位IP版本号   
 13unsigned char tos; //8位服务类型TOS   
 14unsigned short total_len; //16位总长度（字节）   
 15unsigned short ident; //16位标识   
 16unsigned short frag_and_flags; //3位标志位   
 17unsigned char ttl; //8位生存时间 TTL   
 18unsigned char proto; //8位协议 (TCP, UDP 或其他)   
 19unsigned short checksum; //16位IP首部校验和   
 20unsigned int sourceIP; //32位源IP地址   
 21unsigned int destIP; //32位目的IP地址   
 22}IPHEADER; 
 23
 24  
 25typedef struct tsd_hdr //定义TCP伪首部   
 26{   
 27unsigned long saddr; //源地址   
 28unsigned long daddr; //目的地址   
 29char mbz;   
 30char ptcl; //协议类型   
 31unsigned short tcpl; //TCP长度   
 32}PSDHEADER; 
 33
 34  
 35typedef struct tcp_hdr //定义TCP首部   
 36{   
 37USHORT th_sport; //16位源端口   
 38USHORT th_dport; //16位目的端口   
 39unsigned int th_seq; //32位序列号   
 40unsigned int th_ack; //32位确认号   
 41unsigned char th_lenres; //4位首部长度/6位保留字   
 42unsigned char th_flag; //6位标志位   
 43USHORT th_win; //16位窗口大小   
 44USHORT th_sum; //16位校验和   
 45USHORT th_urp; //16位紧急数据偏移量   
 46}TCPHEADER; 
 47
 48  
 49//CheckSum:计算校验和的子函数   
 50USHORT checksum(USHORT *buffer, int size)   
 51{   
 52unsigned long cksum=0;   
 53while(size &gt;1)   
 54{   
 55cksum+=*buffer++;   
 56size -=sizeof(USHORT);   
 57}   
 58if(size )   
 59{   
 60cksum += *(UCHAR*)buffer;   
 61} 
 62
 63  
 64cksum = (cksum &gt;&gt; 16) + (cksum &amp; 0xffff);   
 65cksum += (cksum &gt;&gt;16);   
 66return (USHORT)(~cksum);   
 67} 
 68
 69  
 70void usage()   
 71{   
 72printf("******************************************   
 73");   
 74printf("TCPPing   
 75");   
 76printf(" Written by Refdom   
 77");   
 78printf(" Email: [email protected]   
 79");   
 80printf("Useage: TCPPing.exe Target_ip Target_port   
 81");   
 82printf("*******************************************   
 83");   
 84} 
 85
 86  
 87int main(int argc, char* argv[])   
 88{   
 89WSADATA WSAData;   
 90SOCKET sock;   
 91SOCKADDR_IN addr_in;   
 92IPHEADER ipHeader;   
 93TCPHEADER tcpHeader;   
 94PSDHEADER psdHeader; 
 95
 96  
 97char szSendBuf[60]={0};   
 98BOOL flag;   
 99int rect,nTimeOver; 
100
101  
102usage(); 
103
104  
105if (argc!= 3)   
106{ return false; } 
107
108  
109if (WSAStartup(MAKEWORD(2,2), &amp;WSAData)!=0)   
110{   
111printf("WSAStartup Error!   
112");   
113return false;   
114} 
115
116  
117if ((sock=WSASocket(AF_INET,SOCK_RAW,IPPROTO_RAW,NULL,0,WSA_FLAG_OVERLAPPED))==INVALID_SOCKET)   
118{   
119printf("Socket Setup Error!   
120");   
121return false;   
122}   
123flag=true;   
124if (setsockopt(sock,IPPROTO_IP, IP_HDRINCL,(char *)&amp;flag,sizeof(flag))==SOCKET_ERROR)   
125{   
126printf("setsockopt IP_HDRINCL error!   
127");   
128return false;   
129} 
130
131  
132nTimeOver=1000;   
133if (setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, (char*)&amp;nTimeOver, sizeof(nTimeOver))==SOCKET_ERROR)   
134{   
135printf("setsockopt SO_SNDTIMEO error!   
136");   
137return false;   
138}   
139addr_in.sin_family=AF_INET;   
140addr_in.sin_port=htons(atoi(argv[2]));   
141addr_in.sin_addr.S_un.S_addr=inet_addr(argv[1]); 
142
143  
144//   
145//   
146//填充IP首部   
147ipHeader.h_verlen=(4&lt;&lt;4 | sizeof(ipHeader)/sizeof(unsigned long));   
148// ipHeader.tos=0;   
149ipHeader.total_len=htons(sizeof(ipHeader)+sizeof(tcpHeader));   
150ipHeader.ident=1;   
151ipHeader.frag_and_flags=0;   
152ipHeader.ttl=128;   
153ipHeader.proto=IPPROTO_TCP;   
154ipHeader.checksum=0;   
155ipHeader.sourceIP=inet_addr("本地地址");   
156ipHeader.destIP=inet_addr(argv[1]); 
157
158  
159//填充TCP首部   
160tcpHeader.th_dport=htons(atoi(argv[2]));   
161tcpHeader.th_sport=htons(SOURCE_PORT); //源端口号   
162tcpHeader.th_seq=htonl(0x12345678);   
163tcpHeader.th_ack=0;   
164tcpHeader.th_lenres=(sizeof(tcpHeader)/4&lt;&lt;4|0);   
165tcpHeader.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   
166tcpHeader.th_win=htons(512);   
167tcpHeader.th_urp=0;   
168tcpHeader.th_sum=0; 
169
170  
171psdHeader.saddr=ipHeader.sourceIP;   
172psdHeader.daddr=ipHeader.destIP;   
173psdHeader.mbz=0;   
174psdHeader.ptcl=IPPROTO_TCP;   
175psdHeader.tcpl=htons(sizeof(tcpHeader)); 
176
177  
178//计算校验和   
179memcpy(szSendBuf, &amp;psdHeader, sizeof(psdHeader));   
180memcpy(szSendBuf+sizeof(psdHeader), &amp;tcpHeader, sizeof(tcpHeader));   
181tcpHeader.th_sum=checksum((USHORT *)szSendBuf,sizeof(psdHeader)+sizeof(tcpHeader)); 
182
183  
184memcpy(szSendBuf, &amp;ipHeader, sizeof(ipHeader));   
185memcpy(szSendBuf+sizeof(ipHeader), &amp;tcpHeader, sizeof(tcpHeader));   
186memset(szSendBuf+sizeof(ipHeader)+sizeof(tcpHeader), 0, 4);   
187ipHeader.checksum=checksum((USHORT *)szSendBuf, sizeof(ipHeader)+sizeof(tcpHeader)); 
188
189  
190memcpy(szSendBuf, &amp;ipHeader, sizeof(ipHeader)); 
191
192  
193rect=sendto(sock, szSendBuf, sizeof(ipHeader)+sizeof(tcpHeader),   
1940, (struct sockaddr*)&amp;addr_in, sizeof(addr_in));   
195if (rect==SOCKET_ERROR)   
196{   
197printf("send error!:%d   
198",WSAGetLastError());   
199return false;   
200}   
201else   
202printf("send ok!   
203"); 
204
205  
206closesocket(sock);   
207WSACleanup(); 
208
209  
210return 0;   
211} 
212
213  
214\------------------------------------------- 
215
216  
217reference： 
218
219  
2201、《Breaking into computer networks from the Internet》 Roelof Temmingh &amp; SensePost (Pty) Ltd   
2212、Phrack #49，《Port Scanning without the SYN flag》   
2223、Phrack #51，《The Art of Port Scanning》   
2234、Sys-Security Group《ICMP Usage in Scanning》</ws2tcpip.h></winsock2.h></stdio.h>