execl(_PATH_LOGIN, "login", "-p", "-h", hostname, lusername, (char *)NULL);
execl(_PATH_LOGIN, "login", "-p", "-h", hostname, "--", lusername, (char *)NULL);
char	*topdomain __P((char *));intmain(argc, argv)	int argc;	char *argv[];{	extern int __check_rhosts_file;	struct sockaddr_in from;	int ch, fromlen, on;	openlog("rlogind", LOG_PID | LOG_CONS, LOG_AUTH);	opterr = 0;	while ((ch = getopt(argc, argv, ARGSTR)) != EOF)		switch (ch) {		case 'a':			check_all = 1;			break;		case 'l':			__check_rhosts_file = 0;			break;		case 'n':			keepalive = 0;			break;#ifdef KERBEROS		case 'k':			use_kerberos = 1;			break;		case 'v':			vacuous = 1;			break;		case 'x':			doencrypt = 1;			break;#endif		case '?':		default:			usage();			break;		}	argc -= optind;	argv += optind;#ifdef	KERBEROS	if (use_kerberos && vacuous) {		usage();		fatal(STDERR_FILENO, "only one of -k and -v allowed", 0);	}#endif	fromlen = sizeof (from);	if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {		syslog(LOG_ERR,"Can't get peer name of remote host: %m");		fatal(STDERR_FILENO, "Can't get peer name of remote host", 1);	}	on = 1;	if (keepalive &&	    setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0)		syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");	on = IPTOS_LOWDELAY;	if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)		syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");	doit(0, &from);}int	child;int	netf;char	line[MAXPATHLEN];int	confirmed;struct winsize win = { 0, 0, 0, 0 };voiddoit(f, fromp)	int f;	struct sockaddr_in *fromp;{	int master, pid, on = 1;	int authenticated = 0;	register struct hostent *hp;	char hostname[2 * MAXHOSTNAMELEN + 1];	char c;	alarm(60);	read(f, &c, 1);	if (c != 0)		exit(1);#ifdef	KERBEROS	if (vacuous)		fatal(f, "Remote host requires Kerberos authentication", 0);#endif	alarm(0);	fromp->sin_port = ntohs((u_short)fromp->sin_port);	hp = gethostbyaddr((char *)&fromp->sin_addr, sizeof(struct in_addr),	    fromp->sin_family);	if (hp)		(void)strcpy(hostname, hp->h_name);	else		(void)strcpy(hostname, inet_ntoa(fromp->sin_addr));#ifdef	KERBEROS	if (use_kerberos) {		retval = do_krb_login(fromp);		if (retval == 0)			authenticated++;		else if (retval > 0)			fatal(f, krb_err_txt[retval], 0);		write(f, &c, 1);		confirmed = 1;		/* we sent the null! */	} else#endif	{		if (fromp->sin_family != AF_INET ||		    fromp->sin_port >= IPPORT_RESERVED ||		    fromp->sin_port < IPPORT_RESERVED/2) {			syslog(LOG_NOTICE, "Connection from %s on illegal port",				inet_ntoa(fromp->sin_addr));			fatal(f, "Permission denied", 0);		}#ifdef IP_OPTIONS		{		u_char optbuf[BUFSIZ/3], *cp;		char lbuf[BUFSIZ], *lp;		int optsize = sizeof(optbuf), ipproto;		struct protoent *ip;		if ((ip = getprotobyname("ip")) != NULL)			ipproto = ip->p_proto;		else			ipproto = IPPROTO_IP;		if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf,		    &optsize) == 0 && optsize != 0) {			lp = lbuf;			for (cp = optbuf; optsize > 0; cp++, optsize--, lp += 3)				sprintf(lp, " %2.2x", *cp);			syslog(LOG_NOTICE,			    "Connection received using IP options (ignored):%s",			    lbuf);			if (setsockopt(0, ipproto, IP_OPTIONS,			    (char *)NULL, optsize) != 0) {				syslog(LOG_ERR,				    "setsockopt IP_OPTIONS NULL: %m");				exit(1);			}		}		}#endif		if (do_rlogin(fromp) == 0)			authenticated++;	}	if (confirmed == 0) {		write(f, "", 1);		confirmed = 1;		/* we sent the null! */	}#ifdef	KERBEROS	if (doencrypt)		(void) des_write(f, SECURE_MESSAGE, sizeof(SECURE_MESSAGE) - 1);#endif	netf = f;	pid = forkpty(&master, line, NULL, &win);	if (pid < 0) {		if (errno == ENOENT)			fatal(f, "Out of ptys", 0);		else			fatal(f, "Forkpty", 1);	}	if (pid == 0) {		if (f > 2)	/* f should always be 0, but... */			(void) close(f);		setup_term(0);		if (authenticated) {#ifdef	KERBEROS			if (use_kerberos && (pwd->pw_uid == 0))				syslog(LOG_INFO|LOG_AUTH,				    "ROOT Kerberos login from %s.%s@%s on %s\n",				    kdata->pname, kdata->pinst, kdata->prealm,				    hostname);#endif			execl(_PATH_LOGIN, "login", "-p",			    "-h", hostname, "-f", lusername, (char *)NULL);		} else			execl(_PATH_LOGIN, "login", "-p",			    "-h", hostname, lusername, (char *)NULL);		fatal(STDERR_FILENO, _PATH_LOGIN, 1);		/*NOTREACHED*/	}#ifdef	KERBEROS	/*	 * If encrypted, don't turn on NBIO or the des read/write	 * routines will croak.	 */	if (!doencrypt)#endif		ioctl(f, FIONBIO, &on);	ioctl(master, FIONBIO, &on);	ioctl(master, TIOCPKT, &on);	signal(SIGCHLD, cleanup);	protocol(f, master);	signal(SIGCHLD, SIG_IGN);	cleanup(0);}char	magic[2] = { 0377, 0377 };char	oobdata[] = {TIOCPKT_WINDOW};/* * Handle a "control" request (signaled by magic being present) * in the data stream.  For now, we are only willing to handle * window size changes. */intcontrol(pty, cp, n)	int pty;	char *cp;	int n;{	struct winsize w;	if (n < 4+sizeof (w) || cp[2] != 's' || cp[3] != 's')		return (0);	oobdata[0] &= ~TIOCPKT_WINDOW;	/* we know he heard */	bcopy(cp+4, (char *)&w, sizeof(w));	w.ws_row = ntohs(w.ws_row);	w.ws_col = ntohs(w.ws_col);	w.ws_xpixel = ntohs(w.ws_xpixel);	w.ws_ypixel = ntohs(w.ws_ypixel);	(void)ioctl(pty, TIOCSWINSZ, &w);	return (4+sizeof (w));}/* * rlogin "protocol" machine. */voidprotocol(f, p)	register int f, p;{	char pibuf[1024+1], fibuf[1024], *pbp, *fbp;	register pcc = 0, fcc = 0;	int cc, nfd, n;	char cntl;	/*	 * Must ignore SIGTTOU, otherwise we'll stop	 * when we try and set slave pty's window shape	 * (our controlling tty is the master pty).	 */	(void) signal(SIGTTOU, SIG_IGN);	send(f, oobdata, 1, MSG_OOB);	/* indicate new rlogin */	if (f > p)		nfd = f + 1;	else		nfd = p + 1;	if (nfd > FD_SETSIZE) {		syslog(LOG_ERR, "select mask too small, increase FD_SETSIZE");		fatal(f, "internal error (select mask too small)", 0);	}	for (;;) {		fd_set ibits, obits, ebits, *omask;		FD_ZERO(&ebits);		FD_ZERO(&ibits);		FD_ZERO(&obits);		omask = (fd_set *)NULL;		if (fcc) {			FD_SET(p, &obits);			omask = &obits;		} else			FD_SET(f, &ibits);		if (pcc >= 0)			if (pcc) {				FD_SET(f, &obits);				omask = &obits;			} else				FD_SET(p, &ibits);		FD_SET(p, &ebits);		if ((n = select(nfd, &ibits, omask, &ebits, 0)) < 0) {			if (errno == EINTR)				continue;			fatal(f, "select", 1);		}		if (n == 0) {			/* shouldn't happen... */			sleep(5);			continue;		}#define	pkcontrol(c)	((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))		if (FD_ISSET(p, &ebits)) {			cc = read(p, &cntl, 1);			if (cc == 1 && pkcontrol(cntl)) {				cntl |= oobdata[0];				send(f, &cntl, 1, MSG_OOB);				if (cntl & TIOCPKT_FLUSHWRITE) {					pcc = 0;					FD_CLR(p, &ibits);				}			}		}		if (FD_ISSET(f, &ibits)) {#ifdef	KERBEROS			if (doencrypt)				fcc = des_read(f, fibuf, sizeof(fibuf));			else#endif				fcc = read(f, fibuf, sizeof(fibuf));			if (fcc < 0 && errno == EWOULDBLOCK)				fcc = 0;			else {				register char *cp;				int left, n;				if (fcc <= 0)					break;				fbp = fibuf;			top:				for (cp = fibuf; cp < fibuf+fcc-1; cp++)					if (cp[0] == magic[0] &&					    cp[1] == magic[1]) {						left = fcc - (cp-fibuf);						n = control(p, cp, left);						if (n) {							left -= n;							if (left > 0)								bcopy(cp+n, cp, left);							fcc -= n;							goto top; /* n^2 */						}					}				FD_SET(p, &obits);		/* try write */			}		}		if (FD_ISSET(p, &obits) && fcc > 0) {			cc = write(p, fbp, fcc);			if (cc > 0) {				fcc -= cc;				fbp += cc;			}		}		if (FD_ISSET(p, &ibits)) {			pcc = read(p, pibuf, sizeof (pibuf));			pbp = pibuf;			if (pcc < 0 && errno == EWOULDBLOCK)				pcc = 0;			else if (pcc <= 0)				break;			else if (pibuf[0] == 0) {				pbp++, pcc--;#ifdef	KERBEROS				if (!doencrypt)#endif					FD_SET(f, &obits);	/* try write */			} else {				if (pkcontrol(pibuf[0])) {					pibuf[0] |= oobdata[0];					send(f, &pibuf[0], 1, MSG_OOB);				}				pcc = 0;			}		}		if ((FD_ISSET(f, &obits)) && pcc > 0) {#ifdef	KERBEROS			if (doencrypt)				cc = des_write(f, pbp, pcc);			else#endif				cc = write(f, pbp, pcc);			if (cc < 0 && errno == EWOULDBLOCK) {				/*				 * This happens when we try write after read				 * from p, but some old kernels balk at large				 * writes even when select returns true.				 */				if (!FD_ISSET(p, &ibits))					sleep(5);				continue;			}			if (cc > 0) {				pcc -= cc;				pbp += cc;			}		}	}}voidcleanup(signo)	int signo;{	char *p;	p = line + sizeof(_PATH_DEV) - 1;	if (logout(p))		logwtmp(p, "", "");	(void)chmod(line, 0666);	(void)chown(line, 0, 0);	*p = 'p';	(void)chmod(line, 0666);	(void)chown(line, 0, 0);	shutdown(netf, 2);	exit(1);}voidfatal(f, msg, syserr)	int f;	char *msg;	int syserr;{	int len;	char buf[BUFSIZ], *bp = buf;	/*	 * Prepend binary one to message if we haven't sent	 * the magic null as confirmation.	 */	if (!confirmed)		*bp++ = '\01';		/* error indicator */	if (syserr)		len = sprintf(bp, "rlogind: %s: %s.\r\n",		    msg, strerror(errno));	else		len = sprintf(bp, "rlogind: %s.\r\n", msg);	(void) write(f, buf, bp + len - buf);	exit(1);}intdo_rlogin(dest)	struct sockaddr_in *dest;{	getstr(rusername, sizeof(rusername), "remuser too long");	getstr(lusername, sizeof(lusername), "locuser too long");	getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long");	pwd = getpwnam(lusername);	if (pwd == NULL)		return (-1);	if (pwd->pw_uid == 0)		return (-1);	/* XXX why don't we syslog() failure? */	return (iruserok(dest->sin_addr.s_addr, 0, rusername, lusername));}voidgetstr(buf, cnt, errmsg)	char *buf;	int cnt;	char *errmsg;{	char c;	do {		if (read(0, &c, 1) != 1)			exit(1);		if (--cnt < 0)			fatal(STDOUT_FILENO, errmsg, 0);		*buf++ = c;	} while (c != 0);}extern	char **environ;voidsetup_term(fd)	int fd;{	register char *cp = index(term+ENVSIZE, '/');	char *speed;	struct termios tt;#ifndef notyet	tcgetattr(fd, &tt);	if (cp) {		*cp++ = '\0';		speed = cp;		cp = index(speed, '/');		if (cp)			*cp++ = '\0';		cfsetspeed(&tt, atoi(speed));	}	tt.c_iflag = TTYDEF_IFLAG;	tt.c_oflag = TTYDEF_OFLAG;	tt.c_lflag = TTYDEF_LFLAG;	tcsetattr(fd, TCSAFLUSH, &tt);#else	if (cp) {		*cp++ = '\0';		speed = cp;		cp = index(speed, '/');		if (cp)			*cp++ = '\0';		tcgetattr(fd, &tt);		cfsetspeed(&tt, atoi(speed));		tcsetattr(fd, TCSAFLUSH, &tt);	}#endif	env[0] = term;	env[1] = 0;	environ = env;}#ifdef	KERBEROS#define	VERSION_SIZE	9/* * Do the remote kerberos login to the named host with the * given inet address * * Return 0 on valid authorization * Return -1 on valid authentication, no authorization * Return >0 for error conditions */intdo_krb_login(dest)	struct sockaddr_in *dest;{	int rc;	char instance[INST_SZ], version[VERSION_SIZE];	long authopts = 0L;	/* !mutual */	struct sockaddr_in faddr;	kdata = (AUTH_DAT *) auth_buf;	ticket = (KTEXT) tick_buf;	instance[0] = '*';	instance[1] = '\0';	if (doencrypt) {		rc = sizeof(faddr);		if (getsockname(0, (struct sockaddr *)&faddr, &rc))			return (-1);		authopts = KOPT_DO_MUTUAL;		rc = krb_recvauth(			authopts, 0,			ticket, "rcmd",			instance, dest, &faddr,			kdata, "", schedule, version);		 des_set_key(&kdata->session, schedule);	} else		rc = krb_recvauth(			authopts, 0,			ticket, "rcmd",			instance, dest, (struct sockaddr_in *) 0,			kdata, "", (bit_64 *) 0, version);	if (rc != KSUCCESS)		return (rc);	getstr(lusername, sizeof(lusername), "locuser");	/* get the "cmd" in the rcmd protocol */	getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type");	pwd = getpwnam(lusername);	if (pwd == NULL)		return (-1);	/* returns nonzero for no access */	if (kuserok(kdata, lusername) != 0)		return (-1);		return (0);}#endif /* KERBEROS */voidusage(){#ifdef KERBEROS	syslog(LOG_ERR, "usage: rlogind [-aln] [-k | -v]");#else	syslog(LOG_ERR, "usage: rlogind [-aln]");#endif}/* * Check whether host h is in our local domain, * defined as sharing the last two components of the domain part, * or the entire domain part if the local domain has only one component. * If either name is unqualified (contains no '.'), * assume that the host is local, as it will be * interpreted as such. */intlocal_domain(h)	char *h;{	char localhost[MAXHOSTNAMELEN];	char *p1, *p2;	localhost[0] = 0;	(void) gethostname(localhost, sizeof(localhost));	p1 = topdomain(localhost);	p2 = topdomain(h);	if (p1 == NULL || p2 == NULL || !strcasecmp(p1, p2))		return (1);	return (0);}char *topdomain(h)	char *h;{	register char *p;	char *maybe = NULL;	int dots = 0;	for (p = h + strlen(h); p >= h; p--) {		if (*p == '.') {			if (++dots == 2)				return (p);			maybe = p;		}	}	return (maybe);}