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4-client.c
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4-client.c
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/* Author: Vivek Prakash
* Date: Aug 1, 2011
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <netdb.h>
void usage();
int main(int argc, char **argv)
{
if (argc < 3) {
usage(argv[0]);
exit(1);
}
struct sockaddr_in server;
struct hostent *host;
int sfd, port;
if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
err(1, "Cannot create socket");
port = atoi(argv[2]);
host = (struct hostent *)gethostbyname(argv[1]);
if(host == NULL)
err(1, "%s: No such host", argv[1]);
bzero((char *)&server, sizeof(server));
server.sin_family = AF_INET;
bcopy((char *)host->h_addr, (char *)&server.sin_addr.s_addr, host->h_length);
server.sin_port = htons(port);
if (connect(sfd, (struct sockaddr *)&server, sizeof(server)) < 0 )
err(1, "Cannot connect to the socket");
char buf[256];
bzero(buf, 256);
printf("\nPlease enter the message: ");
fgets(buf, 255, stdin);
int n;
if ((n = write(sfd, buf, strlen(buf))) < 0 )
err(1, "Cannot write to the socket");
bzero(buf, 256);
if ((n = read(sfd, buf, 255)) < 0 )
err(1, "Cannot read from the socket");
printf("Server replied this message: %s\n", buf);
close(sfd);
return 0;
}
void usage(char *prog)
{
printf("usage: %s [hostname] [port]\n", prog);
return;
}