有一个数据中心监测项目，命名为CPing，它的主要原理通过WEB进行前台统一配置管理，后台定期对数据中心相关设备执行Ping操作，并将结果及时写入到数据库。

　　该项目基于Linux平台部署，前端开发语言采用PHP，后台开发语言采用C，由于考量到项目的部署简洁性，后台开发的守护进程尽量不直接操作数据库，而是将需要写入的数据以HTTP的形式发送给PHP的WEB页面，由PHP完成写入操作。这样的好处是后台守护进程部署时不需要配置相关数据库接入环境。

　　下面给出一段后台代码，作用是执行Ping操作，并将结果封装成HTTP报文发送至WEB端。

<span xmlns="http://www.w3.org/1999/xhtml" style="">//---------------------------------------------------------//  HTTPSinge.c ./http www.ifeng.com  0/1 80 127.0.0.1 80 //　用于执行HTTP命令，并将结果通过HTTP GET方式传至WEB数据库//       my2005lb 2013-8-3////---------------------------------------------------------#include <sys/stat.h>#include <fcntl.h>#include <errno.h>#include <netdb.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <string.h>#include <stdlib.h>#include <stdio.h>#include <unistd.h>char* URLTOIP(char *argv){	struct hostent *h;	if((h=gethostbyname(argv))==NULL)	{		fprintf(stderr,"不能得到IP/n");		exit(1);	}	printf("HostName :%s/n",h->h_name);	printf("IP Address :%s/n",inet_ntoa(*((struct in_addr *)h->h_addr)));	return inet_ntoa(*((struct in_addr *)h->h_addr));}// 执行PING 操作int HTTPScan(char *argv,int nPort,int nType,double *pRet){	struct sockaddr_in serverAddr;	int clientSocket;	int nCount = 0;	char sendbuf[2000];	char recvbuf[2000];	if((clientSocket=socket(AF_INET,SOCK_STREAM,0)) < 0)		return -1; 				serverAddr.sin_family=AF_INET;	serverAddr.sin_port=htons(nPort);	printf("%s\n",URLTOIP(argv));	serverAddr.sin_addr.s_addr=inet_addr(URLTOIP(argv));	if(connect(clientSocket,( struct sockaddr * )&serverAddr,sizeof(serverAddr)) < 0)		return -1; 		//printf("%s\n",sendbuf);	sprintf(sendbuf,"HEAD http://%s/ HTTP/1.1\r\nHOST: %s\r\nCONNECTION: CLOSED\r\n\r\n",argv,argv); 	send(clientSocket,sendbuf,strlen(sendbuf),0);	recv(clientSocket,recvbuf,sizeof(recvbuf),0);	printf("%s\n",recvbuf);	close(clientSocket);	return nCount;}// 执行向远程数据中心上报数据int ProcessSQLUpdate(char *strURL,char *strIP,int nPort,char *sendbuf){   	struct sockaddr_in serverAddr;	int clientSocket;	char recvbuf[2000];	if((clientSocket=socket(AF_INET,SOCK_STREAM,0)) < 0)		return -1; 				serverAddr.sin_family=AF_INET;	serverAddr.sin_port=htons(nPort);	serverAddr.sin_addr.s_addr=inet_addr(strIP);	if(connect(clientSocket,( struct sockaddr * )&serverAddr,sizeof(serverAddr)) < 0)		return -1; 		//printf("%s\n",sendbuf);	send(clientSocket,sendbuf,strlen(sendbuf),0);	recv(clientSocket,recvbuf,sizeof(recvbuf),0);	//printf("%s\n",recvbuf);	close(clientSocket);	return 0;}int main(int argc,char *argv[]){		char strIP[250];	int nIPPort = 80;	char strURL[250];	int nPort = 80;	double pRet[6];	int nType=0;	int nCount = 0;	char sendbuf[2000];	if(argc != 6) return 0;	// ./http www.sina.com.cn 1/0 80 127.0.0.1 80(1为HTTPS,0为HTTP)	// url	if(strlen(argv[1]) > 0 && strlen(argv[1]) < 200)		sprintf(strURL,"%s",argv[1]);	else		return 0;		// http https 	if(strlen(argv[2]) > 0 && strlen(argv[2]) < 2)		nType = atoi(argv[2]);	else		return 0;	// scan port	if(strlen(argv[3]) > 0 && strlen(argv[3]) < 6)		nIPPort = atoi(argv[3]);	else		return 0;	// ip 	if(strlen(argv[4]) > 0 && strlen(argv[4]) < 160)		sprintf(strIP,"%s",argv[4]);	else		sprintf(strIP,"127.0.0.1");	if(strlen(argv[5]) > 0 && strlen(argv[5]) <= 5)		nPort = atoi(argv[5]);    printf("%s %d %d %s %d\n",strIP,nIPPort,nType,strURL,nPort);	// process ping 	nCount = HTTPScan(strURL,nIPPort,nType,pRet);	if(nCount == 2)		sprintf(sendbuf,"GET http://%s/CPing/update/http.php?name=%s&lost=%f HTTP/1.1\r\nHOST: %s\r\nCONNECTION: CLOSED\r\n\r\n",strIP,strURL,pRet[1],strIP); 	else if(nCount == 6)		sprintf(sendbuf,"GET http://%s/CPing/update/http.php?name=%s&lost=%f&avg=%f HTTP/1.1\r\nHOST: %s\r\nCONNECTION: CLOSED\r\n\r\n",strIP,strURL,pRet[1],pRet[3],strIP); 	else 		sprintf(sendbuf,"GET http://%s/CPing/update/http.php?name=%s&lost=-1&lost=-1 HTTP/1.1\r\nHOST: %s\r\nCONNECTION: CLOSED\r\n\r\n",strIP,strURL,strIP); //	ProcessSQLUpdate(strURL,strIP,nPort,sendbuf);	/*		printf("Min Value: %f\n",pRet[2]);		printf("Avg Value: %f\n",pRet[3]);		printf("Max Value: %f\n",pRet[4]);		printf("MDev Value: %f\n",pRet[5]);	*/	return 0;}</span>

Linux下用C实现Ping监测与HTTP报文上传