linux c 简单端口扫描程序

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#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <string.h>#include <malloc.h>#include <pthread.h>#include <semaphore.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/time.h>#include <sys/ioctl.h>#include <netinet/in.h>#include <errno.h>#include <string.h>int SERVER_PORT= 1;#define  SERVER_IP   "127.0.0.1"#define  WRITE_BUF_SIZE  1024#define  SUCCESS 0#define  FAILURE -1int main(int argc, char **argv){int sfd;int iReadNum;char acBuf[WRITE_BUF_SIZE];struct sockaddr_in saddr;int socklen;int iClientLen;int iReturn;if(argc!=2){printf("usage:./a.out 127.0.0.1\n");return FAILURE;}printf("scanning port 1-8888...... \n");while(SERVER_PORT<8889){//socket_initsfd = socket(AF_INET, SOCK_STREAM, 0);if (sfd < 0){perror("socket()");return FAILURE;}//套接口设置saddr.sin_family = AF_INET;//inet_pton将点分十进制--》二进制整数inet_pton(AF_INET, argv[1], &saddr.sin_addr);saddr.sin_port = htons(SERVER_PORT);socklen = sizeof(saddr);//尝试连接自己的地址以及端口iReturn = connect(sfd, (const struct sockaddr *)&saddr, socklen);if(iReturn >= 0){sleep(1);printf("port %d open\n",SERVER_PORT);}close(sfd);SERVER_PORT++;}return SUCCESS;}

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