I am new to network programming. So far I am just analyzing programs written by others. I have just one computer so I have to use address 127.0.0.1 when running these programs.
When I attempt to run this client (./client 127.0.0.1) I get a 'connection refused' error.
Any suggestions as to why this might occur. Thanks in advance !
Code:
#include "myheader.h"
#define SA struct sockaddr
int
main(int argc, char **argv)
{
int sockfd, n;
char recvline[MAXLINE + 1];
struct sockaddr_in servaddr;
if (argc != 2)
printf ("Usage: ./client <server address>\n"), exit (1);
if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror ("Socket error"), exit (1);
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)
printf ("inet_pton error for %s\n", argv[1]), exit (1);
if (connect(sockfd, (SA *) &servaddr, sizeof(servaddr)) < 0)
perror ("connect error"), exit (1);
while ( (n = read(sockfd, recvline, MAXLINE)) > 0) {
recvline[n] = 0; /* null terminate */
if (fputs(recvline, stdout) == EOF)
perror ("fputs error"), exit (1);
}
if (n < 0)
printf ("read error\n"), exit (1);
exit(0);
}
Here is the code for the server:
Code:
#include "myheader.h"
#define SA struct sockaddr
int
main(int argc, char **argv)
{
int listenfd, connfd;
struct sockaddr_in servaddr;
char buff[MAXLINE];
time_t ticks;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(13); /* daytime server */
bind(listenfd, (SA *) &servaddr, sizeof(servaddr));
listen(listenfd, 5);
for ( ; ; ) {
connfd = accept(listenfd, (SA *) NULL, NULL);
ticks = time(NULL);
snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
write(connfd, buff, strlen(buff));
close(connfd);
}
}
PS. myheader.h includes all network include files needed.