tcp.zip_connect_tcp_tcp 握手

#include<stdio.h> #include <winsock2.h> #include <ws2tcpip.h> #pragma comment(lib,"ws2_32") #pragma warning (disable:4786) int scan(char *ip,int starport,int endport) { //端口合法性判断 if(starport<1||starport>65535||endport<1||endport>65535) { printf("端口超出范围"); return -1; } if(starport>endport){ printf("起始端口不能高于结束端口\n"); return -1; } printf("扫描开始\n"); int i=0; //初始化套接字 WORD sockVersion = MAKEWORD(2,2); WSADATA wsaData; if(WSAStartup(sockVersion, &wsaData)!=0) { return -1; } for(i=starport;i<=endport;i++){ struct sockaddr_in clientaddr; //创建用户 clientaddr.sin_family=AF_INET; clientaddr.sin_addr.s_addr=inet_addr(ip); //用户地址 clientaddr.sin_port=htons(i); //用户端口 //创建套接字 int sock=socket(AF_INET,SOCK_STREAM,0); if(sock<0){ perror("错误:不能创建 socket\n"); return -1; } //连接 int error=connect(sock,(struct sockaddr*)&clientaddr,sizeof(clientaddr)); if(error<0){ printf("端口:%5d | 状态:关闭\n",i); fflush(stdout);//清空缓存 } else{ struct servent* sptr; if((sptr=getservbyport(htons(i),"tcp"))!=NULL) printf("端口:%5d | 服务:%s | 状态:open\n",i,sptr->s_name); else printf("端口:%5d | 状态:open\n",i); } closesocket(sock); //关闭套接字 } return 1; } int main() { int starport,endport; printf("------------------------------\n"); printf("| 欢迎使用端口扫描器 |\n"); printf("-------------------------------\n"); char *ip=(char *)malloc(sizeof(char)); printf("请输入要扫描的ip地址\n"); scanf("%s",&ip); printf("请输入起始端口\n"); scanf("%d",&starport); printf("请输入结束端口\n"); scanf("%d",&endport); scan("ip",starport,endport); return 0; }