c/c++利用socket判断web服务器是否能访问

最近用到相关方面知识，所以写了这个。可以测网站时延和带宽

#include <stdio.h>#include <unistd.h>#include <sys/types.h>#include <sys/socket.h>#include <sys/stat.h>#include <fcntl.h>#include <string.h>#include <arpa/inet.h>#include <netdb.h>#include <netinet/in.h>#include <stdlib.h>#include <time.h> #define BUFSIZE 0xF000void geturl(char* url,char* port){int cfd;struct sockaddr_in cadd;struct hostent *pURL = NULL;char myurl[BUFSIZE];char *pHost = 0;char host[BUFSIZE],GET[BUFSIZE];char request[BUFSIZE];static char text[BUFSIZE];int i,j;struct timeval start,start_tz;struct timeval middle,middle_tz;struct timeval finish,finish_tz;float timegap = 0;float timegap_middle = 0;float bandwidth = 0;     //分离主机中的主机地址和相对路径    memset(myurl,0,BUFSIZE);    memset(host,0,BUFSIZE);    memset(GET,0,BUFSIZE);    strcpy(myurl,url);    for(pHost = myurl;*pHost != '/' && *pHost != '\0';++pHost);      //获取相对路径保存到GET中     if((int)(pHost-myurl) == strlen(myurl))     {strcpy(GET,"/");//即url中没有给出相对路径，需要自己手动的在url尾部加上/     }     else     {        strcpy(GET,pHost);//地址段pHost到strlen(myurl)保存的是相对路径     }         //将主机信息保存到host中        //此处将它置零，即它所指向的内容里面已经分离出了相对路径，剩下的为host信 //息(从myurl到pHost地址段存放的是HOST)        *pHost = '\0';         strcpy(host,myurl);        //设置socket参数        if(-1 == (cfd = socket(AF_INET,SOCK_STREAM,0)))        {                printf("create socket failed of client!\n");                exit(-1);        }         pURL = gethostbyname(host);//将上面获得的主机信息通过域名解析函数获得域名信息         //设置IP地址结构        bzero(&cadd,sizeof(struct sockaddr_in));        cadd.sin_family = AF_INET;        cadd.sin_addr.s_addr = *((unsigned long*)pURL->h_addr_list[0]);  //        cadd.sin_port = htons(atoi(port));        //向WEB服务器发送URL信息        memset(request,0,BUFSIZE);        strcat(request,"GET ");        strcat(request,GET);        strcat(request," HTTP/1.1\r\n");//至此为http请求行的信息        strcat(request,"HOST: ");        strcat(request,host);        strcat(request,"\r\n");        strcat(request,"Cache-Control: no-cache\r\n\r\n");        //连接服务器 //printf("%s \n",request);int cc;gettimeofday(&start,&start_tz);        if(-1 == (cc = connect(cfd,(struct sockaddr*)&cadd,(socklen_t)sizeof(cadd))))        {                fprintf(stderr,"invaild ! \ndomain name:%s \nport:%s \n",url,port);                exit(1);        }   //     printf("connect success!\n"); gettimeofday(&middle,&middle_tz);        //向服务器发送url请求的request        int cs;        if(-1 == (cs = send(cfd,request,strlen(request),0)))        {                printf("向服务器发送请求的request失败!\n");                exit(1);        }        //printf("发送成功,发送的字节数:%d\n",cs);         //客户端接收服务器的返回信息        memset(text,0,BUFSIZE);        int recv_bytes;        if(-1 == (recv_bytes = recv(cfd,text,BUFSIZE,0)))        {                fprintf(stderr,"invaild ! \ndomain name:%s \nport:%s \n",url,port);                exit(1);        }        else        {printf("%s\n",text);printf("recv %d byte \n",recv_bytes);gettimeofday(&finish,&finish_tz);printf("start.tv_sec %d start.tv_usec %d \n",start.tv_sec,start.tv_usec);printf("middle.tv_sec %d middle.tv_usec %d \n",middle.tv_sec,middle.tv_usec);printf("finish.tv_sec %d finish.tv_usec %d \n",finish.tv_sec,finish.tv_usec);                int sec = finish.tv_sec - start.tv_sec;int usec = finish.tv_usec - start.tv_usec ;int sec_middle = finish.tv_sec - middle.tv_sec;int usec_middle = finish.tv_usec - middle.tv_usec ;//printf(" sec %d usec %d \n",sec,usec);timegap = sec*1000 + (float)usec/1000;timegap_middle = sec_middle*1000 + (float)usec_middle/1000;float total_kb = (float)recv_bytes/1024;float timegap_sec = (float)timegap/1000;float timegap_sec_middle = (float)timegap_middle/1000;//printf("total_kb :%f kb ! \n",total_kb);//printf("timegap_sec:%f s ! \n",timegap_sec);bandwidth = total_kb/timegap_sec;                printf("normal ! \ndomain name:%s \nport:%s \n",url,port);printf("Time delay:%f ms ! \n",timegap);printf("Time delay(middle):%f ms ! \n",timegap_middle);printf("Read bandwidth :%f Kb/s ! \n",bandwidth);        }        close(cfd); } int main(int argc,char* argv[]){        if(argc != 3)        {                printf("useage:%s url port\n",argv[0]);                exit(1);        }        geturl(argv[1],argv[2]);        return 0;}