c语言下的端口扫描代码（转）

原始出处：http://www.antcodes.cn/post/10.html

Code Language : C

1. #include <stdafx.h>
2. #include <stdio.h>
3. #include <string.h>
4. #include <winsock.h>
5. #pragma comment (lib,"ws2_32.lib")
6. int main(int argc, char *argv[]) {
7.  
8. int mysocket;
9.  
10. int pcount = 0;
11.  
12. struct sockaddr_in my_addr;
13.  
14. WSADATA wsaData;
15.  
16. WORD wVersionRequested=MAKEWORD(1,1);
17.  
18.  
19. if(argc < 3) {
20.  
21. printf("usage: %s <host> <maxport>\n", argv[0]);
22.  
23. exit(1);
24.  
25. }
26.  
27.  
28. if (WSAStartup(wVersionRequested , &wsaData)){
29.  
30. printf("Winsock Initialization failed.\n");
31.  
32. exit(1);
33.  
34. }
35.  
36.  
37. for(int i=1; i < atoi(argv[2]); i++){
38.  
39. if((mysocket = socket(AF_INET, SOCK_STREAM,0)) == INVALID_SOCKET){
40.  
41. printf("Socket Error");
42.  
43. exit(1);
44.  
45. }
46.  
47.  
48. my_addr.sin_family = AF_INET;
49.  
50. my_addr.sin_port = htons(i);
51.  
52. my_addr.sin_addr.s_addr = inet_addr(argv[1]);
53.  
54.  
55. if(connect(mysocket, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == SOCKET_ERROR)
56.  
57. closesocket(mysocket);
58.  
59. else{
60.  
61. pcount++;
62.  
63. printf("Port %d - open\n", i);
64.  
65. }}
66.  
67.  
68. printf("%d ports open on host - %s\n", pcount, argv[1]);
69.  
70. closesocket(mysocket);
71.  
72. WSACleanup();
73.  
74. return 0;
75. }

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