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clientg.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
// ------------------------------------------------------------
//
//
void error(const char *msg)
{
perror(msg);
exit(0);
}
// ------------------------------------------------------------
// GET a Beluga code from infchg.appspot.com
//
int main(int argc, char *argv[])
{
int sockfd, portn, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];
char buf[256]="GET / HTTP/1.0\r\n\r\n"; // "sss" for sending wrong method
// GET / HTTP/1.0\r\n\r\n for index page
if (argc < 3) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
//portn = atoi(argv[2]);
portn = 80;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
// erver = gethostbyname(argv[1]);
server = gethostbyname("infchg.appspot.com");
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portn);
if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
//printf("sending-message: ");
bzero(buffer,256);
//fgets(buffer,255,stdin);
// jua: buffer-> buf
n = write(sockfd,buf,strlen(buf));
if (n < 0)
error("ERROR writing to socket");
bzero(buffer,256);
n = read(sockfd,buffer,255);
if (n < 0)
error("ERROR reading from socket");
printf("%s\n",buffer);
close(sockfd);
return 0;
}
// ------------------------------------------------------------
/* example, when sending sss instead of the valid GET method we receive:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>501 Method Not Implemented</title>
</head><body>
<h1>Method Not Implemented</h1>
<p>sss to /index.dhtml not supported.<br />
</p>
</body></html>
*/
// ------------------------------------------------------------
/* when sending the right GET to infchg.appspot.com we get the graph page:
HTTP/1.1 200 OK
Date: Mon, 15 Oct 2012 14:01:15 GMT
Server: Apache
Last-Modified: Mon, 15 Oct 2012 14:01:15 GMT
ETag: W/"2be85-866-4cc197883e0c0"
Accept-Ranges: bytes
Content-Length: 2150
Cache-Control: max-age=0, no-store
Connection: close
....
*/