[unix-history] / usr / src / libexec / rlogind / rlogind.c

#ifndef lint
static char sccsid[] = "@(#)rlogind.c	4.8 83/01/07";
#endif

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>

#include <netinet/in.h>

#include <errno.h>
#include <pwd.h>
#include <wait.h>
#include <signal.h>
#include <sgtty.h>
#include <stdio.h>
#include <netdb.h>

extern	errno;
struct	passwd *getpwnam();
char	*crypt(), *rindex(), *index(), *malloc();
int	options = SO_ACCEPTCONN|SO_KEEPALIVE;
struct	sockaddr_in sin = { AF_INET };
/*
 * remote login server:
 *	remuser\0
 *	locuser\0
 *	terminal type\0
 *	data
 */
main(argc, argv)
	int argc;
	char **argv;
{
	union wait status;
	int f, debug = 0;
	struct sockaddr_in from;
	struct servent *sp;

	sp = getservbyname("login", "tcp");
	if (sp == 0) {
		fprintf(stderr, "rlogind: tcp/rlogin: unknown service\n");
		exit(1);
	}
#ifndef DEBUG
	if (fork())
		exit(0);
	for (f = 0; f < 10; f++)
		(void) close(f);
	(void) open("/", 0);
	(void) dup2(0, 1);
	(void) dup2(0, 2);
	{ int tt = open("/dev/tty", 2);
	  if (tt > 0) {
		ioctl(tt, TIOCNOTTY, 0);
		close(tt);
	  }
	}
#endif
	sin.sin_port = sp->s_port;
	argc--, argv++;
	if (argc > 0 && !strcmp(argv[0], "-d")) {
		int port = atoi(argv[0]);

		if (port < 0) {
			fprintf(stderr, "%s: bad port #\n", argv[0]);
			exit(1);
		}
		sin.sin_port = htons((u_short)port);
		argv++, argc--;
	}
	f = socket(AF_INET, SOCK_STREAM, 0, 0);
	if (f < 0) {
		perror("rlogind: socket");
		exit(1);
	}
	if (bind(f, &sin, sizeof (sin), 0) < 0) {
		perror("rlogind: bind");
		exit(1);
	}
	listen(f, 10);
	for (;;) {
		int s, len = sizeof (from);

		s = accept(f, &from, &len, 0);
		if (s < 0) {
			perror("rlogind: accept");
			sleep(1);
			continue;
		}
		if (fork() == 0)
			doit(s, &from);
		close(s);
		while (wait3(status, WNOHANG, 0) > 0)
			continue;
	}
}

char	locuser[32], remuser[32];
char	buf[BUFSIZ];
int	child;
int	cleanup();
int	netf;
extern	errno;
char	*line;

doit(f, fromp)
	int f;
	struct sockaddr_in *fromp;
{
	char c;
	int i, p, cc, t, pid;
	int stop = TIOCPKT_DOSTOP;
	register struct hostent *hp;

	alarm(60);
	read(f, &c, 1);
	if (c != 0)
		exit(1);
	alarm(0);
	fromp->sin_port = htons((u_short)fromp->sin_port);
	hp = gethostbyaddr(&fromp->sin_addr, sizeof (struct in_addr),
		fromp->sin_family);
	if (hp == 0)
		fatal(f, "Host name for your address unknown");
	if (fromp->sin_family != AF_INET ||
	    fromp->sin_port >= IPPORT_RESERVED ||
	    hp == 0)
		fatal(f, "Permission denied");
	write(f, "", 1);
	for (c = 'p'; c <= 's'; c++) {
		struct stat stb;
		line = "/dev/ptyXX";
		line[strlen("/dev/pty")] = c;
		line[strlen("/dev/ptyp")] = '0';
		if (stat(line, &stb) < 0)
			break;
		for (i = 0; i < 16; i++) {
			line[strlen("/dev/ptyp")] = "0123456789abcdef"[i];
			p = open(line, 2);
			if (p > 0)
				goto gotpty;
		}
	}
	fatal(f, "All network ports in use");
	/*NOTREACHED*/
gotpty:
	dup2(f, 0);
	line[strlen("/dev/")] = 't';
#ifdef DEBUG
	{ int tt = open("/dev/tty", 2);
	  if (tt > 0) {
		ioctl(tt, TIOCNOTTY, 0);
		close(tt);
	  }
	}
#endif
	t = open(line, 2);
	if (t < 0)
		fatalperror(f, line, errno);
	{ struct sgttyb b;
	  gtty(t, &b); b.sg_flags = RAW|ANYP; stty(t, &b);
	}
	pid = fork();
	if (pid < 0)
		fatalperror(f, "", errno);
	if (pid) {
		char pibuf[1024], fibuf[1024], *pbp, *fbp;
		int pcc = 0, fcc = 0, on = 1;
/* FILE *console = fopen("/dev/console", "w");  */
/* setbuf(console, 0); */

/* fprintf(console, "f %d p %d\r\n", f, p); */
		ioctl(f, FIONBIO, &on);
		ioctl(p, FIONBIO, &on);
		ioctl(p, TIOCPKT, &on);
		signal(SIGTSTP, SIG_IGN);
		sigset(SIGCHLD, cleanup);
		for (;;) {
			int ibits = 0, obits = 0;

			if (fcc)
				obits |= (1<<p);
			else
				ibits |= (1<<f);
			if (pcc >= 0)
				if (pcc)
					obits |= (1<<f);
				else
					ibits |= (1<<p);
			if (fcc < 0 && pcc < 0)
				break;
/* fprintf(console, "ibits from %d obits from %d\r\n", ibits, obits); */
			select(16, &ibits, &obits, 0, 0, 0);
/* fprintf(console, "ibits %d obits %d\r\n", ibits, obits); */
			if (ibits == 0 && obits == 0) {
				sleep(5);
				continue;
			}
			if (ibits & (1<<f)) {
				fcc = read(f, fibuf, sizeof (fibuf));
/* fprintf(console, "%d from f\r\n", fcc); */
				if (fcc < 0 && errno == EWOULDBLOCK)
					fcc = 0;
				else {
					if (fcc <= 0)
						break;
					fbp = fibuf;
				}
			}
			if (ibits & (1<<p)) {
				pcc = read(p, pibuf, sizeof (pibuf));
/* fprintf(console, "%d from p, buf[0] %x, errno %d\r\n", pcc, buf[0], errno); */
				pbp = pibuf;
				if (pcc < 0 && errno == EWOULDBLOCK)
					pcc = 0;
				else if (pcc <= 0)
					pcc = -1;
				else if (pibuf[0] == 0)
					pbp++, pcc--;
				else {
					if (pibuf[0]&(TIOCPKT_FLUSHWRITE|
						      TIOCPKT_NOSTOP|
						      TIOCPKT_DOSTOP)) {
						int nstop = pibuf[0] &
						    (TIOCPKT_NOSTOP|
						     TIOCPKT_DOSTOP);
						if (nstop)
							stop = nstop;
						pibuf[0] |= nstop;
						send(f,&pibuf[0],1,SOF_OOB);
					}
					pcc = 0;
				}
			}
			if ((obits & (1<<f)) && pcc > 0) {
				cc = write(f, pbp, pcc);
/* fprintf(console, "%d of %d to f\r\n", cc, pcc); */
				if (cc > 0) {
					pcc -= cc;
					pbp += cc;
				}
			}
			if ((obits & (1<<p)) && fcc > 0) {
				cc = write(p, fbp, fcc);
/* fprintf(console, "%d of %d to p\r\n", cc, fcc); */
				if (cc > 0) {
					fcc -= cc;
					fbp += cc;
				}
			}
		}
		cleanup();
	}
	close(f);
	close(p);
	dup2(t, 0);
	dup2(t, 1);
	dup2(t, 2);
	close(t);
	execl("/bin/login", "login", "-r", hp->h_name, 0);
	fatalperror(2, "/bin/login", errno);
	/*NOTREACHED*/
}

cleanup()
{

	rmut();
	vhangup();		/* XXX */
	shutdown(netf, 2);
	kill(0, SIGKILL);
	exit(1);
}

fatal(f, msg)
	int f;
	char *msg;
{
	char buf[BUFSIZ];

	buf[0] = '\01';		/* error indicator */
	(void) sprintf(buf + 1, "rlogind: %s.\n", msg);
	(void) write(f, buf, strlen(buf));
	exit(1);
}

fatalperror(f, msg, errno)
	int f;
	char *msg;
	int errno;
{
	char buf[BUFSIZ];
	extern char *sys_errlist[];

	(void) sprintf(buf, "%s: %s", msg, sys_errlist[errno]);
	fatal(f, buf);
}

#include <utmp.h>

struct	utmp wtmp;
char	wtmpf[]	= "/usr/adm/wtmp";
char	utmp[] = "/etc/utmp";
#define SCPYN(a, b)	strncpy(a, b, sizeof(a))
#define SCMPN(a, b)	strncmp(a, b, sizeof(a))

rmut()
{
	register f;
	int found = 0;

	f = open(utmp, 2);
	if (f >= 0) {
		while(read(f, (char *)&wtmp, sizeof(wtmp)) == sizeof(wtmp)) {
			if (SCMPN(wtmp.ut_line, line+5) || wtmp.ut_name[0]==0)
				continue;
			lseek(f, -(long)sizeof(wtmp), 1);
			SCPYN(wtmp.ut_name, "");
			time(&wtmp.ut_time);
			write(f, (char *)&wtmp, sizeof(wtmp));
			found++;
		}
		close(f);
	}
	if (found) {
		f = open(wtmpf, 1);
		if (f >= 0) {
			SCPYN(wtmp.ut_line, line+5);
			SCPYN(wtmp.ut_name, "");
			time(&wtmp.ut_time);
			lseek(f, (long)0, 2);
			write(f, (char *)&wtmp, sizeof(wtmp));
			close(f);
		}
	}
	chmod(line, 0666);
	chown(line, 0, 0);
	line[strlen("/dev/")] = 'p';
	chmod(line, 0666);
	chown(line, 0, 0);
}
Commit	Line	Data
a10a364d	1	#ifndef lint
ff24c640	2	static char sccsid[] = "@(#)rlogind.c 4.8 83/01/07";
a10a364d BJ	3	#endif
	4
	5	#include <stdio.h>
	6	#include <sys/types.h>
	7	#include <sys/stat.h>
	8	#include <sys/socket.h>
c6c678f1 SL	9
	10	#include <netinet/in.h>
	11
a10a364d BJ	12	#include <errno.h>
	13	#include <pwd.h>
	14	#include <wait.h>
	15	#include <signal.h>
	16	#include <sgtty.h>
	17	#include <stdio.h>
3f5b52bc	18	#include <netdb.h>
a10a364d BJ	19
	20	extern errno;
	21	struct passwd *getpwnam();
3f5b52bc	22	char crypt(), rindex(), index(), malloc();
a10a364d	23	int options = SO_ACCEPTCONN\|SO_KEEPALIVE;
3f5b52bc	24	struct sockaddr_in sin = { AF_INET };
a10a364d BJ	25	/*
	26	* remote login server:
	27	* remuser\0
	28	* locuser\0
	29	* terminal type\0
	30	* data
	31	*/
	32	main(argc, argv)
	33	int argc;
	34	char **argv;
	35	{
	36	union wait status;
	37	int f, debug = 0;
	38	struct sockaddr_in from;
3f5b52bc	39	struct servent *sp;
a10a364d	40
3f5b52bc SL	41	sp = getservbyname("login", "tcp");
	42	if (sp == 0) {
	43	fprintf(stderr, "rlogind: tcp/rlogin: unknown service\n");
	44	exit(1);
	45	}
a10a364d BJ	46	#ifndef DEBUG
	47	if (fork())
	48	exit(0);
	49	for (f = 0; f < 10; f++)
	50	(void) close(f);
	51	(void) open("/", 0);
	52	(void) dup2(0, 1);
	53	(void) dup2(0, 2);
	54	{ int tt = open("/dev/tty", 2);
	55	if (tt > 0) {
	56	ioctl(tt, TIOCNOTTY, 0);
	57	close(tt);
	58	}
	59	}
	60	#endif
cb2d476f	61	sin.sin_port = sp->s_port;
a10a364d	62	argc--, argv++;
c6c678f1	63	if (argc > 0 && !strcmp(argv[0], "-d")) {
3f5b52bc SL	64	int port = atoi(argv[0]);
	65
	66	if (port < 0) {
	67	fprintf(stderr, "%s: bad port #\n", argv[0]);
	68	exit(1);
	69	}
cb2d476f	70	sin.sin_port = htons((u_short)port);
3f5b52bc SL	71	argv++, argc--;
3f5b52bc SL	72	}
85b11450	73	f = socket(AF_INET, SOCK_STREAM, 0, 0);
c6c678f1 SL	74	if (f < 0) {
	75	perror("rlogind: socket");
	76	exit(1);
	77	}
	78	if (bind(f, &sin, sizeof (sin), 0) < 0) {
	79	perror("rlogind: bind");
	80	exit(1);
	81	}
	82	listen(f, 10);
a10a364d	83	for (;;) {
c6c678f1 SL	84	int s, len = sizeof (from);
	85
	86	s = accept(f, &from, &len, 0);
	87	if (s < 0) {
82c973f2	88	perror("rlogind: accept");
a10a364d BJ	89	sleep(1);
	90	continue;
	91	}
	92	if (fork() == 0)
c6c678f1 SL	93	doit(s, &from);
c6c678f1 SL	94	close(s);
a10a364d BJ	95	while (wait3(status, WNOHANG, 0) > 0)
	96	continue;
	97	}
	98	}
	99
	100	char locuser[32], remuser[32];
	101	char buf[BUFSIZ];
	102	int child;
	103	int cleanup();
	104	int netf;
	105	extern errno;
	106	char *line;
	107
	108	doit(f, fromp)
	109	int f;
	110	struct sockaddr_in *fromp;
	111	{
3f5b52bc	112	char c;
82c973f2	113	int i, p, cc, t, pid;
a10a364d	114	int stop = TIOCPKT_DOSTOP;
3f5b52bc	115	register struct hostent *hp;
a10a364d BJ	116
	117	alarm(60);
	118	read(f, &c, 1);
	119	if (c != 0)
	120	exit(1);
	121	alarm(0);
cb2d476f	122	fromp->sin_port = htons((u_short)fromp->sin_port);
3f5b52bc SL	123	hp = gethostbyaddr(&fromp->sin_addr, sizeof (struct in_addr),
3f5b52bc SL	124	fromp->sin_family);
82c973f2 SL	125	if (hp == 0)
82c973f2 SL	126	fatal(f, "Host name for your address unknown");
a10a364d BJ	127	if (fromp->sin_family != AF_INET \|\|
a10a364d BJ	128	fromp->sin_port >= IPPORT_RESERVED \|\|
82c973f2 SL	129	hp == 0)
82c973f2 SL	130	fatal(f, "Permission denied");
a10a364d BJ	131	write(f, "", 1);
	132	for (c = 'p'; c <= 's'; c++) {
	133	struct stat stb;
	134	line = "/dev/ptyXX";
	135	line[strlen("/dev/pty")] = c;
	136	line[strlen("/dev/ptyp")] = '0';
	137	if (stat(line, &stb) < 0)
	138	break;
	139	for (i = 0; i < 16; i++) {
	140	line[strlen("/dev/ptyp")] = "0123456789abcdef"[i];
	141	p = open(line, 2);
	142	if (p > 0)
	143	goto gotpty;
	144	}
	145	}
82c973f2 SL	146	fatal(f, "All network ports in use");
82c973f2 SL	147	/NOTREACHED/
a10a364d BJ	148	gotpty:
	149	dup2(f, 0);
	150	line[strlen("/dev/")] = 't';
	151	#ifdef DEBUG
	152	{ int tt = open("/dev/tty", 2);
	153	if (tt > 0) {
	154	ioctl(tt, TIOCNOTTY, 0);
	155	close(tt);
	156	}
	157	}
	158	#endif
	159	t = open(line, 2);
82c973f2 SL	160	if (t < 0)
82c973f2 SL	161	fatalperror(f, line, errno);
a10a364d BJ	162	{ struct sgttyb b;
	163	gtty(t, &b); b.sg_flags = RAW\|ANYP; stty(t, &b);
	164	}
82c973f2 SL	165	pid = fork();
	166	if (pid < 0)
	167	fatalperror(f, "", errno);
	168	if (pid) {
a10a364d BJ	169	char pibuf[1024], fibuf[1024], pbp, fbp;
	170	int pcc = 0, fcc = 0, on = 1;
	171	/* FILE console = fopen("/dev/console", "w"); /
	172	/* setbuf(console, 0); */
	173
	174	/* fprintf(console, "f %d p %d\r\n", f, p); */
	175	ioctl(f, FIONBIO, &on);
	176	ioctl(p, FIONBIO, &on);
	177	ioctl(p, TIOCPKT, &on);
	178	signal(SIGTSTP, SIG_IGN);
	179	sigset(SIGCHLD, cleanup);
	180	for (;;) {
	181	int ibits = 0, obits = 0;
82c973f2 SL	182
	183	if (fcc)
	184	obits \|= (1<<p);
	185	else
	186	ibits \|= (1<<f);
a10a364d	187	if (pcc >= 0)
82c973f2 SL	188	if (pcc)
	189	obits \|= (1<<f);
	190	else
	191	ibits \|= (1<<p);
	192	if (fcc < 0 && pcc < 0)
	193	break;
a10a364d	194	/* fprintf(console, "ibits from %d obits from %d\r\n", ibits, obits); */
c6c678f1	195	select(16, &ibits, &obits, 0, 0, 0);
a10a364d BJ	196	/* fprintf(console, "ibits %d obits %d\r\n", ibits, obits); */
	197	if (ibits == 0 && obits == 0) {
	198	sleep(5);
	199	continue;
	200	}
	201	if (ibits & (1<<f)) {
	202	fcc = read(f, fibuf, sizeof (fibuf));
	203	/* fprintf(console, "%d from f\r\n", fcc); */
	204	if (fcc < 0 && errno == EWOULDBLOCK)
	205	fcc = 0;
	206	else {
	207	if (fcc <= 0)
	208	break;
	209	fbp = fibuf;
	210	}
	211	}
	212	if (ibits & (1<<p)) {
	213	pcc = read(p, pibuf, sizeof (pibuf));
	214	/* fprintf(console, "%d from p, buf[0] %x, errno %d\r\n", pcc, buf[0], errno); */
	215	pbp = pibuf;
	216	if (pcc < 0 && errno == EWOULDBLOCK)
	217	pcc = 0;
	218	else if (pcc <= 0)
	219	pcc = -1;
	220	else if (pibuf[0] == 0)
	221	pbp++, pcc--;
	222	else {
	223	if (pibuf[0]&(TIOCPKT_FLUSHWRITE\|
	224	TIOCPKT_NOSTOP\|
	225	TIOCPKT_DOSTOP)) {
	226	int nstop = pibuf[0] &
	227	(TIOCPKT_NOSTOP\|
	228	TIOCPKT_DOSTOP);
	229	if (nstop)
	230	stop = nstop;
	231	pibuf[0] \|= nstop;
c6c678f1	232	send(f,&pibuf[0],1,SOF_OOB);
a10a364d BJ	233	}
	234	pcc = 0;
	235	}
	236	}
	237	if ((obits & (1<<f)) && pcc > 0) {
	238	cc = write(f, pbp, pcc);
	239	/* fprintf(console, "%d of %d to f\r\n", cc, pcc); */
	240	if (cc > 0) {
	241	pcc -= cc;
	242	pbp += cc;
	243	}
	244	}
	245	if ((obits & (1<<p)) && fcc > 0) {
	246	cc = write(p, fbp, fcc);
	247	/* fprintf(console, "%d of %d to p\r\n", cc, fcc); */
	248	if (cc > 0) {
	249	fcc -= cc;
	250	fbp += cc;
	251	}
	252	}
	253	}
	254	cleanup();
	255	}
	256	close(f);
	257	close(p);
	258	dup2(t, 0);
	259	dup2(t, 1);
	260	dup2(t, 2);
	261	close(t);
3f5b52bc	262	execl("/bin/login", "login", "-r", hp->h_name, 0);
82c973f2 SL	263	fatalperror(2, "/bin/login", errno);
82c973f2 SL	264	/NOTREACHED/
a10a364d BJ	265	}
	266
	267	cleanup()
	268	{
a10a364d BJ	269
a10a364d BJ	270	rmut();
dd83e8ac	271	vhangup(); /* XXX */
ff24c640	272	shutdown(netf, 2);
a10a364d BJ	273	kill(0, SIGKILL);
	274	exit(1);
	275	}
	276
82c973f2 SL	277	fatal(f, msg)
	278	int f;
	279	char *msg;
	280	{
	281	char buf[BUFSIZ];
	282
	283	buf[0] = '\01'; /* error indicator */
	284	(void) sprintf(buf + 1, "rlogind: %s.\n", msg);
	285	(void) write(f, buf, strlen(buf));
	286	exit(1);
	287	}
	288
	289	fatalperror(f, msg, errno)
	290	int f;
	291	char *msg;
	292	int errno;
	293	{
	294	char buf[BUFSIZ];
	295	extern char *sys_errlist[];
	296
	297	(void) sprintf(buf, "%s: %s", msg, sys_errlist[errno]);
	298	fatal(f, buf);
	299	}
	300
a10a364d BJ	301	#include <utmp.h>
	302
	303	struct utmp wtmp;
	304	char wtmpf[] = "/usr/adm/wtmp";
	305	char utmp[] = "/etc/utmp";
	306	#define SCPYN(a, b) strncpy(a, b, sizeof(a))
	307	#define SCMPN(a, b) strncmp(a, b, sizeof(a))
	308
	309	rmut()
	310	{
	311	register f;
	312	int found = 0;
	313
	314	f = open(utmp, 2);
	315	if (f >= 0) {
	316	while(read(f, (char *)&wtmp, sizeof(wtmp)) == sizeof(wtmp)) {
	317	if (SCMPN(wtmp.ut_line, line+5) \|\| wtmp.ut_name[0]==0)
	318	continue;
	319	lseek(f, -(long)sizeof(wtmp), 1);
	320	SCPYN(wtmp.ut_name, "");
	321	time(&wtmp.ut_time);
	322	write(f, (char *)&wtmp, sizeof(wtmp));
	323	found++;
	324	}
	325	close(f);
	326	}
	327	if (found) {
	328	f = open(wtmpf, 1);
	329	if (f >= 0) {
	330	SCPYN(wtmp.ut_line, line+5);
	331	SCPYN(wtmp.ut_name, "");
	332	time(&wtmp.ut_time);
	333	lseek(f, (long)0, 2);
	334	write(f, (char *)&wtmp, sizeof(wtmp));
	335	close(f);
	336	}
	337	}
	338	chmod(line, 0666);
	339	chown(line, 0, 0);
	340	line[strlen("/dev/")] = 'p';
	341	chmod(line, 0666);
	342	chown(line, 0, 0);
	343	}