minix/test/select/test06_cli.c

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/*
* Test name: test06_cli.c
*
* Objective: Test a simple TCP client
*
* Description: Implements a simple echo client using the TCP protocol. First
* it waits until it is possible to write (which is always).
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <net/netlib.h>
#include <net/gen/netdb.h>
#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/hton.h>
#define PORT 6060L
int tcp_connect(char *host, long port)
{
/* creates a tcp connection with specified host and port */
char *tcp_device;
struct hostent *hp;
int netfd;
nwio_tcpcl_t tcpcopt;
nwio_tcpconf_t tcpconf;
ipaddr_t dirhost;
int tries;
int result;
/* get host address */
if ((hp = gethostbyname(host)) == (struct hostent*) NULL)
{
fprintf(stderr,"Unknown host\n");
return(-1);
}
memcpy((char *)&dirhost, (char *)hp->h_addr, hp->h_length);
/* Get default TCP device */
if (( tcp_device = getenv("TCP_DEVICE") ) == NULL)
tcp_device = TCP_DEVICE;
/* Establish TCP connection */
if ((netfd = open(tcp_device, O_RDWR)) < 0)
{
fprintf(stderr,"Error opening TCP device\n");
return -1;
}
/* Configure TCP connection */
tcpconf.nwtc_flags=NWTC_LP_SEL | NWTC_SET_RA | NWTC_SET_RP;
tcpconf.nwtc_remaddr = dirhost;
tcpconf.nwtc_remport = (tcpport_t) htons(port);
if ((result = ioctl(netfd, NWIOSTCPCONF, &tcpconf) ) <0)
{
fprintf(stderr, "Error establishing communication\n");
printf("Error: %d\n",result);
close(netfd);
return -1;
}
/* Get configuration for TCP comm */
if ((result = ioctl(netfd, NWIOGTCPCONF, &tcpconf) ) < 0)
{
fprintf(stderr,"Error getting configuration\n");
printf("Error: %d\n", result);
close(netfd);
return -1;
}
/* Establish connection */
tcpcopt.nwtcl_flags = 0;
tries = 0;
while (tries < 10) {
if ( (result = ioctl(netfd, NWIOTCPCONN, &tcpcopt)) < 0 ) {
if (errno != EAGAIN)
{
fprintf(stderr, "Server is not listening\n");
close(netfd);
return(-1);
}
fprintf(stderr, "Unable to connect\n");
sleep(1);
tries++;
}
else
break; /* Connection */
}
/* Check result value */
if (result < 0) {
fprintf(stderr, "Error connecting\n");
fprintf(stderr, "Error: %d\n", result);
printf("Number of tries: %d\n", tries);
printf("Error: %d\n", errno);
close(netfd);
return -1;
}
return netfd;
}
int main(int argc,char *argv[]) {
int fd;
ssize_t data_read;
char send_buf[1024];
char recv_buf[1024];
fd_set fds_write;
int ret;
/* Check parameters */
if (argc !=2) {
fprintf(stderr,"Usage: %s host\n", argv[0]);
exit(-1);
}
if ((fd = tcp_connect(argv[1], PORT) ) < 0)
exit(-1);
printf("Connected to server\n");
/* init fd_set */
FD_ZERO(&fds_write);
FD_SET(fd, &fds_write);
while (1)
{
/* Wait until it is possible to write with select */
ret = select(4, NULL, &fds_write, NULL, NULL);
if (ret < 0) {
fprintf(stderr, "Error on select waiting for write: %d\n", errno);
exit(-1);
}
if (!FD_ISSET(fd, &fds_write)) {
fprintf(stderr, "Error: The net connection is not ready for writing (?)\n");
exit(-1);
}
/* Get a string and send it */
printf("Ready to write...\n");
printf("Send data: ");
gets(send_buf);
write(fd, &send_buf, strlen(send_buf)+1);
/* If data sent is exit then break */
if (!strcmp(send_buf,"exit"))
break;
/* Get server response */
data_read = read(fd, &recv_buf, 1024);
printf("Received: %s\n\n", recv_buf);
}
/* Close TCP communication */
close(fd);
}