void ClientThread::SubProcess(const char *ttyName) {
struct termios termbuf;
//子进程开始执行
setenv("TERM", this->type.c_str(), 1);
setsid();
close(0);
int ttyfd = open(ttyName, O_RDWR, 0666);
dup2(0, 1);
dup2(0, 2);
int pid = getpid();
tcsetpgrp(0, pid); /* switch this tty's process group to us */
tcgetattr(0, &termbuf);
termbuf.c_lflag |= ECHO;
termbuf.c_oflag |= ONLCR | XTABS;
termbuf.c_iflag |= ICRNL;
termbuf.c_iflag &= ~IXOFF;
/*termbuf.c_lflag &= ~ICANON;*/
tcsetattr(STDIN_FILENO, TCSANOW, &termbuf);
print_login_issue("/etc/issue.net", ttyName);
//启动登陆程序
char login[] = "/bin/login";
char *login_argv[2] = { login, NULL };
execvp("/bin/login", (char**) (login_argv));
}
/* We rely on that there is space in the buffer for now. */
char *b = ts->buf2 + ts->rdidx2;
*b++ = IAC;
*b++ = command;
*b++ = option;
ts->rdidx2 += 3;
ts->size2 += 3;
}
static struct tsession *
#ifdef CONFIG_FEATURE_TELNETD_INETD
make_new_session(void)
#else /* CONFIG_FEATURE_TELNETD_INETD */
make_new_session(int sockfd)
#endif /* CONFIG_FEATURE_TELNETD_INETD */
{
struct termios termbuf;
int pty, pid;
char tty_name[32];
struct tsession *ts = malloc(sizeof(struct tsession) + BUFSIZE * 2);
ts->buf1 = (char *)(&ts[1]);
ts->buf2 = ts->buf1 + BUFSIZE;
#ifdef CONFIG_FEATURE_TELNETD_INETD
ts->sockfd_read = 0;
ts->sockfd_write = 1;
#else /* CONFIG_FEATURE_TELNETD_INETD */
ts->sockfd = sockfd;
#endif /* CONFIG_FEATURE_TELNETD_INETD */
ts->rdidx1 = ts->wridx1 = ts->size1 = 0;
ts->rdidx2 = ts->wridx2 = ts->size2 = 0;
#ifdef CONFIG_FEATURE_TELNETD_INACTIVE_TIMEOUT
/* initialize it with the timeout value*/
ts->timeout_time = time(NULL) + TIMEOUT;
#endif /* CONFIG_FEATURE_TELNETD_INACTIVE_TIMEOUT */
/* Got a new connection, set up a tty and spawn a shell. */
pty = getpty(tty_name);
if (pty < 0) {
syslog(LOG_ERR, "All network ports in use!");
return 0;
}
if (pty > maxfd)
maxfd = pty;
ts->ptyfd = pty;
/* Make the telnet client understand we will echo characters so it
* should not do it locally. We don't tell the client to run linemode,
* because we want to handle line editing and tab completion and other
* stuff that requires char-by-char support.
*/
send_iac(ts, DO, TELOPT_ECHO);
send_iac(ts, DO, TELOPT_NAWS);
send_iac(ts, DO, TELOPT_LFLOW);
send_iac(ts, WILL, TELOPT_ECHO);
send_iac(ts, WILL, TELOPT_SGA);
if ((pid = fork()) < 0) {
syslog(LOG_ERR, "Can`t forking");
}
if (pid == 0) {
/* In child, open the child's side of the tty. */
int i;
for(i = 0; i <= maxfd; i++)
close(i);
/* make new process group */
setsid();
if (open(tty_name, O_RDWR /*| O_NOCTTY*/) < 0) {
syslog(LOG_ERR, "Could not open tty");
exit(1);
}
dup(0);
dup(0);
tcsetpgrp(0, getpid());
/* The pseudo-terminal allocated to the client is configured to operate in
* cooked mode, and with XTABS CRMOD enabled (see tty(4)).
*/
tcgetattr(0, &termbuf);
termbuf.c_lflag |= ECHO; /* if we use readline we dont want this */
termbuf.c_oflag |= ONLCR|XTABS;
termbuf.c_iflag |= ICRNL;
termbuf.c_iflag &= ~IXOFF;
/*termbuf.c_lflag &= ~ICANON;*/
tcsetattr(0, TCSANOW, &termbuf);
print_login_issue(issuefile, NULL);
/* exec shell, with correct argv and env */
execv(loginpath, (char *const *)argv_init);
/* NOT REACHED */
syslog(LOG_ERR, "execv error");
exit(1);
}
ts->shell_pid = pid;
return ts;
}
