Sunday, February 15, 2009

A Simple Daytime Client

#include "unp.h"

int main(int argc, char **argv)
{
int sockfd, n;
char recvline[MAXLINE + 1];
struct sockaddr_in servaddr;

if (argc != 2)
err_quit("usage: a.out <IPaddress>");

if (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
err_sys("socket error");

bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(13); /* daytime server */

if (inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0)
err_quit("inet_pton error for %s", argv[1]);

if (connect(sockfd, (SA *) &servaddr, sizeof(servaddr)) < 0)
err_sys("connect error");

while ((n = read(sockfd, recvline, MAXLINE)) > 0)
{
recvline[n] = 0; /* null terminate */

if (fputs(recvline, stdout) == EOF)
err_sys("fputs error");
}

if (n < 0)
err_sys("read error");

exit(0);
}

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