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#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>
#define BUFSIZE 0xF000
void geturl(char* url)
{
int cfd;
struct sockaddr_in cadd;
struct hostent *pURL = NULL;
//int BUFSIZE = (int)malloc(2048);
char myurl[BUFSIZE];
char *pHost = 0;
//char *pGET = 0;
char host[BUFSIZE],GET[BUFSIZE];
char request[BUFSIZE];
static char text[BUFSIZE];
int i,j;
//分离主机中的主机地址和相对路径
memset(myurl,0,BUFSIZE);
memset(host,0,BUFSIZE);
strcpy(myurl,url);
for(pHost = myurl;*pHost != '/' && *pHost != '\0';++pHost);
//获取相对路径保存到GET中
memset(GET,0,BUFSIZE);
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);
}
printf("create socket success of client!\n");
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(80);
//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,"Accept: text/html, image/jpeg, image/png, vedio/x-mng, text/*, image/*, */*\r\n");
strcat(request,"Accept-Lauguage: zh-cn\r\n");
strcat(request,"Accept-Encoding: x-gzip, x-deflate, gzip, deflat\r\n");
strcat(request,"Accept-charset: utf-8, utf-8; q=0.5, *; q=0.5\r\n");
strcat(request,"HOST: ");
strcat(request,host);
strcat(request,"\r\n");
//strcat(request,"Content-Type: text/html\r\n");
//strcat(request,"Content-Length: 1024\r\n");
strcat(request,"Connection: Keep-Alive\r\n");
strcat(request,"Cache-Control: no-cache\r\n\r\n");
//连接服务器
int cc;
if(-1 == (cc = connect(cfd,(struct sockaddr*)&cadd,(socklen_t)sizeof(cadd))))
{
printf("connect failed of client!\n");
exit(1);
}
printf("connect success!\n");
//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);
//将http请求信息写入文件hPage
int chfd;
if(-1 == (chfd = open("hPage",O_RDWR|O_CREAT|O_TRUNC,0766)))
{
printf("open or create hPage failed!\n");
exit(1);
}
printf("open or create success!\n");
int chf;
if(-1 == (chf = write(chfd,request,strlen(request))))
{
perror("hPage写入请求信息失败!\n");
exit(1);
}
else if(chf == 0)
{
printf("hPage写入请求信息字节数为0!\n");
}
printf("hPage写入了请求信息:%d字节\n",chf);
//客户端接收服务器的返回信息
memset(text,0,BUFSIZE);
int cr;
if(-1 == (cr = recv(cfd,text,BUFSIZE,0)))
{
printf("recieve failed!\n");
exit(1);
}
else
{
printf("receive succecc!\n");
int cofd;
for(;;)
{
//创建一个文件mPage用于保存网页的主要信息
if(-1 == (cofd = open("mPage.html",O_RDWR|O_CREAT|O_TRUNC,0766)))
{
perror("open or create mPage fialed!\n");
exit(1);
}
//将网页的主要内容(text)写入mPage中
int cf;
if(-1 == (cf = write(cofd,text,strlen(text))))
{
perror("mPage写入主页信息失败!\n");
break;
}
else if(cf == 0)
{
printf("mPage写入主页信息字节数为0!\n");
break;
}
else
{
printf("mPage写入了主页信息:%d字节\n",cf);
break;
}
//将text清空,方便接受其他网页信息
memset(text,0,BUFSIZE);
//关闭文件描述符
//close(chfd);
close(cofd);
}
}
//free(BUFSIZE);
close(cfd);
}
int main(int argc,char* argv[])
{
if(argc<2)
{
printf("用法:%c url网页网址\n",argv[0]);
exit(1);
}
geturl(argv[1]);
return 0;
}