minix/commands/telnetd/term.c

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2005-04-21 16:53:53 +02:00
/*
* TNET A server program for MINIX which implements the TCP/IP
* suite of networking protocols. It is based on the
* TCP/IP code written by Phil Karn et al, as found in
* his NET package for Packet Radio communications.
*
* Handle the TERMINAL module.
*
* Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
* Michael Temari, <temari@temari.ae.ge.com>
*
* 07/29/92 MT Telnet options hack which seems to work okay
* 01/12/93 MT Better telnet options processing instead of hack
*/
#include <sys/types.h>
#include <errno.h>
#if 0
#include <fcntl.h>
#endif
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include "telnet.h"
#include "telnetd.h"
_PROTOTYPE(void sig_done, (int sig));
static char buff[4096];
void term_init()
{
tel_init();
telopt(1, WILL, TELOPT_SGA);
telopt(1, DO, TELOPT_SGA);
telopt(1, WILL, TELOPT_BINARY);
telopt(1, DO, TELOPT_BINARY);
telopt(1, WILL, TELOPT_ECHO);
}
static int io_done = 0;
void term_inout(pty_fd)
int pty_fd;
{
register int i;
pid_t pid;
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = sig_done;
sigaction(SIGALRM, &sa, (struct sigaction *) NULL);
if ((pid = fork()) == -1) {
sprintf(buff, "telnetd: fork() failed: %s\r\n", strerror(errno));
(void) write(1, buff, strlen(buff));
}
if (pid != 0) {
/* network -> login process */
while (!io_done && (i = read(0, buff, sizeof(buff))) > 0) {
tel_in(pty_fd, 1, buff, i);
}
/* EOF, kill opposite number and exit. */
(void) kill(pid, SIGKILL);
} else {
/* login process -> network */
while ((i = read(pty_fd, buff, sizeof(buff))) > 0) {
tel_out(1, buff, i);
}
/* EOF, alert opposite number and exit. */
(void) kill(getppid(), SIGALRM);
}
/* EOF. */
}
void sig_done(sig)
int sig;
{
io_done = 1;
alarm(1); /* there is always a chance... */
}