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#include<unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include<sys/stat.h>
#include<fcntl.h>
#include <sys/socket.h>
#define PORT 80
#define MAXDATASIZE 100
int main(int argc, char *argv[])
{
int sockfd, numbytes;
struct hostent *he;
struct sockaddr_in their_addr;
int fd, size, length = 0, bufsize;
char buf[1024], *p;
char get_str[] = "GET /~jianfeng/adsl/Linux_ADSL.html HTTP/1.1\r\nAccept: */*\r\nAccept-Encoding: gzip, deflate\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon)\r\nHost: 135.1.218.129\r\nConnection: Keep-Alive\r\n\r\n";
if ((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
perror("socket");
exit(1);
}
their_addr.sin_family = AF_INET;
their_addr.sin_port = htons(PORT);
their_addr.sin_addr.s_addr = inet_addr("135.1.218.129");
bzero(&(their_addr.sin_zero), 8);
if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct
sockaddr)) == -1)
{
perror("connect");
exit(1);
}
if ( send(sockfd, get_str, sizeof(get_str), 0) < 0 )
{
perror("send to ihgpweb failed");
exit(1);
}
recv(sockfd,buf,sizeof(buf),0);
/* check if server return 200 0K */
printf("%s\n", buf);
if ( strstr(buf, "HTTP/1.1 200 OK") != NULL )
{
/* get the file length */
p = strstr(buf, "Content-length: ");
p += 16;
while ( *p !='\r' )
{
length = length*10 + *p - '0';
p++;
}
printf("file length: %d\n", length);
fd = open("Linux_ADSL.html",O_WRONLY|O_CREAT);
while ( length > 0 )
{
if ( length > 1024 ) bufsize = 1024;
else bufsize = length;
size = read(sockfd,buf,1024);
printf("==========%d\n", size);
write(fd, buf, size);
length = length - size;
}
printf("file download complete\n");
close(fd);
}
close(sockfd);
return 0;
}
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