[unix-history] / usr / src / usr.bin / login / login.c

static	char *sccsid = "@(#)login.c	4.23 83/05/19";
/*
 * login [ name ]
 * login -r
 */

#include <sys/types.h>
#include <sgtty.h>
#include <utmp.h>
#include <signal.h>
#include <pwd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <lastlog.h>

#define	SCPYN(a, b)	strncpy(a, b, sizeof(a))

#define NMAX	sizeof(utmp.ut_name)
#define LMAX	sizeof(utmp.ut_line)

#define	FALSE	0
#define	TRUE	-1

char	nolog[] =	"/etc/nologin";
char	qlog[]  =	".hushlogin";
char	securetty[] =	"/etc/securetty";
char	maildir[30] =	"/usr/spool/mail/";
char	lastlog[] =	"/usr/adm/lastlog";
struct	passwd nouser = {"", "nope", -1, -1, -1, "", "", "", "" };
struct	sgttyb ttyb;
struct	utmp utmp;
char	minusnam[16] = "-";

char	homedir[64] = "HOME=";
char	shell[64] = "SHELL=";
char	term[64] = "TERM=";
char	user[20] = "USER=";
char	*speeds[] =
    { "0", "50", "75", "110", "134", "150", "200", "300",
      "600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" };
#define	NSPEEDS	(sizeof (speeds) / sizeof (speeds[0]))

char	*envinit[] =
    {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user, 0};

struct	passwd *pwd;
struct	passwd *getpwnam();
char	*strcat(), *rindex(), *index();
int	setpwent();
char	*ttyname();
char	*crypt();
char	*getpass();
char	*stypeof();
extern	char **environ;

struct	ttychars tc = {
	CERASE,	CKILL,	CINTR,	CQUIT,	CSTART,
	CSTOP,	CEOF,	CBRK,	CSUSP,	CDSUSP,
	CRPRNT,	CFLUSH,	CWERASE,CLNEXT
};

int	rflag;
char	rusername[NMAX+1], lusername[NMAX+1];
char	rpassword[NMAX+1];
char	name[NMAX+1];
char	*rhost;

main(argc, argv)
char **argv;
{
	register char *namep;
	int t, f, c;
	int invalid;
	int quietlog;
	int i;
	FILE *nlfd;
	char *ttyn;
	int ldisc = 0, zero = 0;
	FILE *hostf; int first = 1;

	alarm(60);
	signal(SIGQUIT, SIG_IGN);
	signal(SIGINT, SIG_IGN);
	nice(-100);
	nice(20);
	nice(0);
	if (argc > 1 && !strcmp(argv[1], "-r")) {
		rflag++;
		rhost = argv[2];
		argc = 1;
		getstr(rusername, sizeof (rusername), "remuser");
		getstr(lusername, sizeof (lusername), "locuser");
		getstr(term+5, sizeof(term)-5, "Terminal type");
		if (getuid())
			goto abnormal;
		setpwent();
		pwd = getpwnam(lusername);
		endpwent();
		if (pwd == NULL)
			goto abnormal;
		hostf = pwd->pw_uid ? fopen("/etc/hosts.equiv", "r") : 0;
	again:
		if (hostf) {
			char ahost[32];

		        while (fgets(ahost, sizeof (ahost), hostf)) {
				char *user;

				if ((user = index(ahost, '\n')) != 0)
					*user++ = '\0';
				if ((user = index(ahost, ' ')) != 0)
					*user++ = '\0';
				if (!strcmp(rhost, ahost) &&
				    !strcmp(rusername, user ?
				    user : lusername)) {
					fclose(hostf);
					goto normal;
				}
			}
			fclose(hostf);
		}
		if (first == 1) {
			char *rhosts = ".rhosts";
			struct stat sbuf;

			first = 0;
			if (chdir(pwd->pw_dir) < 0)
				goto again;
			if (lstat(rhosts, &sbuf) < 0)
				goto again;
			if ((sbuf.st_mode & S_IFMT) == S_IFLNK) {
				printf("login: .rhosts is a soft link.\r\n");
				goto abnormal;
			}
			hostf = fopen(rhosts, "r");
			fstat(fileno(hostf), &sbuf);
			if ((int) sbuf.st_uid != pwd->pw_uid &&
			    (int) sbuf.st_uid != 0) {
				printf("login: Bad .rhosts ownership.\r\n");
			        fclose(hostf);
				goto abnormal;
			}
		goto again;
		}
abnormal:
		rhost = 0;
		rflag = -1;
	}
normal:
	ioctl(0, TIOCLSET, &zero);	/* XXX */
	ioctl(0, TIOCNXCL, 0);
	ioctl(0, FIONBIO, &zero);
	ioctl(0, FIOASYNC, &zero);
	ioctl(0, TIOCGETP, &ttyb);	/* XXX */
	if (rflag) {
		char *cp = index(term, '/');
		if (cp) {
			int i;
			*cp++ = 0;
			for (i = 0; i < NSPEEDS; i++)
				if (!strcmp(speeds[i], cp)) {
					ttyb.sg_ispeed = ttyb.sg_ospeed = i;
					break;
				}
		}
		ttyb.sg_flags = ECHO|CRMOD|ANYP|XTABS;
	}
	ioctl(0, TIOCSETP, &ttyb);	/* XXX */
	ioctl(0, TIOCCSET, &tc);
	for (t=3; t<20; t++)
		close(t);
	ttyn = ttyname(0);
	if (ttyn==(char *)0)
		ttyn = "/dev/tty??";
	do {
		ldisc = 0;
		ioctl(0, TIOCSETD, &ldisc);
		invalid = FALSE;
		SCPYN(utmp.ut_name, "");
		if (argc>1) {
			SCPYN(utmp.ut_name, argv[1]);
			argc = 0;
		}
		if (rflag) {
			SCPYN(utmp.ut_name, lusername);
			if (rflag == -1)
				rflag = 0;
		} else
			while (utmp.ut_name[0] == '\0') {
				namep = utmp.ut_name;
				{ char hostname[32];
				  gethostname(hostname, sizeof (hostname));
				  printf("%s login: ", hostname); }
				while ((c = getchar()) != '\n') {
					if (c == ' ')
						c = '_';
					if (c == EOF)
						exit(0);
					if (namep < utmp.ut_name+NMAX)
						*namep++ = c;
				}
			}
		if (rhost == 0) {
			setpwent();
			if ((pwd = getpwnam(utmp.ut_name)) == NULL)
				pwd = &nouser;
			endpwent();
		}
		if (!strcmp(pwd->pw_shell, "/bin/csh")) {
			ldisc = NTTYDISC;
			ioctl(0, TIOCSETD, &ldisc);
		}
		if (rhost == 0) {
			if (*pwd->pw_passwd != '\0') {
				char *pp;
				nice(-4);
				if (rflag == 0)
					pp = getpass("Password:");
				else
					pp = rpassword;
				namep = crypt(pp,pwd->pw_passwd);
				nice(4);
				if (strcmp(namep, pwd->pw_passwd))
					invalid = TRUE;
			}
		}
		if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) {
			/* logins are disabled except for root */
			while ((c = getc(nlfd)) != EOF)
				putchar(c);
			fflush(stdout);
			sleep(5);
			exit(0);
		}
		if (!invalid && pwd->pw_uid == 0 &&
		    !rootterm(ttyn+sizeof("/dev/")-1)) {
			logerr("ROOT LOGIN REFUSED %s",
			    ttyn+sizeof("/dev/")-1);
			invalid = TRUE;
		}
		if (invalid) {
			printf("Login incorrect\n");
			if (ttyn[sizeof("/dev/tty")-1] == 'd')
				logerr("BADDIALUP %s %s\n",
				    ttyn+sizeof("/dev/")-1, utmp.ut_name);
		}
		if (*pwd->pw_shell == '\0')
			pwd->pw_shell = "/bin/sh";
		i = strlen(pwd->pw_shell);
		if (chdir(pwd->pw_dir) < 0 && !invalid ) {
			if (chdir("/") < 0) {
				printf("No directory!\n");
				invalid = TRUE;
			} else {
				printf("No directory!  Logging in with home=/\n");
				pwd->pw_dir = "/";
			}
		}
		if (rflag && invalid)
			exit(1);
	} while (invalid);


	time(&utmp.ut_time);
	t = ttyslot();
	if (t>0 && (f = open("/etc/utmp", 1)) >= 0) {
		lseek(f, (long)(t*sizeof(utmp)), 0);
		SCPYN(utmp.ut_line, rindex(ttyn, '/')+1);
		write(f, (char *)&utmp, sizeof(utmp));
		close(f);
	}
	if (t>0 && (f = open("/usr/adm/wtmp", 1)) >= 0) {
		lseek(f, 0L, 2);
		write(f, (char *)&utmp, sizeof(utmp));
		close(f);
	}
	quietlog = 0;
	if (access(qlog, 0) == 0)
		quietlog = 1;
	if ((f = open(lastlog, 2)) >= 0) {
		struct lastlog ll;

		lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
		if (read(f, (char *) &ll, sizeof ll) == sizeof ll &&
		    ll.ll_time != 0) {
			if (quietlog == 0)
			printf("Last login: %.*s on %.*s\n"
			    , 24-5
			    , (char *) ctime(&ll.ll_time)
			    , sizeof(ll.ll_line)
			    , ll.ll_line
			);
		}
		lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
		time(&ll.ll_time);
		SCPYN(ll.ll_line, rindex(ttyn, '/')+1);
		write(f, (char *) &ll, sizeof ll);
		close(f);
	}
	chown(ttyn, pwd->pw_uid, pwd->pw_gid);
	chmod(ttyn, 0622);
	setgid(pwd->pw_gid);
	strncpy(name, utmp.ut_name, NMAX);
	name[NMAX] = '\0';
	initgroups(name, pwd->pw_gid);
	setuid(pwd->pw_uid);
	environ = envinit;
	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
	if (term[strlen("TERM=")] == 0)
		strncat(term, stypeof(ttyn), sizeof(term)-6);
	strncat(user, pwd->pw_name, sizeof(user)-6);
	if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
		namep = pwd->pw_shell;
	else
		namep++;
	strcat(minusnam, namep);
	alarm(0);
	umask(022);
	if (ttyn[sizeof("/dev/tty")-1] == 'd')
		logerr("DIALUP %s %s\n", ttyn+sizeof("/dev/")-1, pwd->pw_name);
	if (!quietlog) {
		showmotd();
		strcat(maildir, pwd->pw_name);
		if (access(maildir,4)==0) {
			struct stat statb;
			stat(maildir, &statb);
			if (statb.st_size)
				printf("You have mail.\n");
		}
	}
	
	signal(SIGQUIT, SIG_DFL);
	signal(SIGINT, SIG_DFL);
	signal(SIGTSTP, SIG_IGN);
	execlp(pwd->pw_shell, minusnam, 0);
	perror(pwd->pw_shell);
	printf("No shell\n");
	exit(0);
}

int	stopmotd;
catch()
{

	signal(SIGINT, SIG_IGN);
	stopmotd++;
}

rootterm(tty)
	char *tty;
{
	register FILE *fd;
	char buf[100];

	if ((fd = fopen(securetty, "r")) == NULL)
		return(1);
	while (fgets(buf, sizeof buf, fd) != NULL) {
		buf[strlen(buf)-1] = '\0';
		if (strcmp(tty, buf) == 0) {
			fclose(fd);
			return(1);
		}
	}
	fclose(fd);
	return(0);
}

showmotd()
{
	FILE *mf;
	register c;

	signal(SIGINT, catch);
	if ((mf = fopen("/etc/motd","r")) != NULL) {
		while ((c = getc(mf)) != EOF && stopmotd == 0)
			putchar(c);
		fclose(mf);
	}
	signal(SIGINT, SIG_IGN);
}

#undef	UNKNOWN
#define UNKNOWN "su"

char *
stypeof(ttyid)
char	*ttyid;
{
	static char	typebuf[16];
	char		buf[50];
	register FILE	*f;
	register char	*p, *t, *q;

	if (ttyid == NULL)
		return (UNKNOWN);
	f = fopen("/etc/ttytype", "r");
	if (f == NULL)
		return (UNKNOWN);
	/* split off end of name */
	for (p = q = ttyid; *p != 0; p++)
		if (*p == '/')
			q = p + 1;

	/* scan the file */
	while (fgets(buf, sizeof buf, f) != NULL)
	{
		for (t=buf; *t!=' ' && *t != '\t'; t++)
			;
		*t++ = 0;
		while (*t == ' ' || *t == '\t')
			t++;
		for (p=t; *p>' '; p++)
			;
		*p = 0;
		if (strcmp(q,t)==0) {
			strcpy(typebuf, buf);
			fclose(f);
			return (typebuf);
		}
	}
	fclose (f);
	return (UNKNOWN);
}

getstr(buf, cnt, err)
	char *buf;
	int cnt;
	char *err;
{
	char c;

	do {
		if (read(0, &c, 1) != 1)
			exit(1);
		if (--cnt < 0) {
			printf("%s too long\r\n", err);
			exit(1);
		}
		*buf++ = c;
	} while (c != 0);
}

logerr(fmt, a1, a2, a3)
	char *fmt, *a1, *a2, *a3;
{

}
Commit	Line	Data
32e13142	1	static char *sccsid = "@(#)login.c 4.23 83/05/19";
88a01c09 BJ	2	/*
88a01c09 BJ	3	* login [ name ]
86eb6c9e	4	* login -r
88a01c09 BJ	5	*/
	6
	7	#include <sys/types.h>
	8	#include <sgtty.h>
	9	#include <utmp.h>
	10	#include <signal.h>
	11	#include <pwd.h>
	12	#include <stdio.h>
	13	#include <sys/stat.h>
	14	#include <lastlog.h>
f570e1ff BJ	15
f570e1ff BJ	16	#define SCPYN(a, b) strncpy(a, b, sizeof(a))
88a01c09	17
b4389814 BJ	18	#define NMAX sizeof(utmp.ut_name)
b4389814 BJ	19	#define LMAX sizeof(utmp.ut_line)
88a01c09	20
f570e1ff BJ	21	#define FALSE 0
	22	#define TRUE -1
	23
	24	char nolog[] = "/etc/nologin";
	25	char qlog[] = ".hushlogin";
	26	char securetty[] = "/etc/securetty";
88a01c09 BJ	27	char maildir[30] = "/usr/spool/mail/";
88a01c09 BJ	28	char lastlog[] = "/usr/adm/lastlog";
3479a16a	29	struct passwd nouser = {"", "nope", -1, -1, -1, "", "", "", "" };
88a01c09 BJ	30	struct sgttyb ttyb;
	31	struct utmp utmp;
	32	char minusnam[16] = "-";
86eb6c9e	33
88a01c09 BJ	34	char homedir[64] = "HOME=";
	35	char shell[64] = "SHELL=";
	36	char term[64] = "TERM=";
f570e1ff	37	char user[20] = "USER=";
86eb6c9e BJ	38	char *speeds[] =
	39	{ "0", "50", "75", "110", "134", "150", "200", "300",
	40	"600", "1200", "1800", "2400", "4800", "9600", "19200", "38400" };
	41	#define NSPEEDS (sizeof (speeds) / sizeof (speeds[0]))
	42
	43	char *envinit[] =
	44	{homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user, 0};
88a01c09	45
86eb6c9e	46	struct passwd *pwd;
88a01c09	47	struct passwd *getpwnam();
86eb6c9e	48	char strcat(), rindex(), *index();
88a01c09 BJ	49	int setpwent();
	50	char *ttyname();
	51	char *crypt();
	52	char *getpass();
88a01c09 BJ	53	char *stypeof();
	54	extern char **environ;
	55
3479a16a SL	56	struct ttychars tc = {
	57	CERASE, CKILL, CINTR, CQUIT, CSTART,
	58	CSTOP, CEOF, CBRK, CSUSP, CDSUSP,
	59	CRPRNT, CFLUSH, CWERASE,CLNEXT
841d84b0 BJ	60	};
841d84b0 BJ	61
86eb6c9e	62	int rflag;
b4389814	63	char rusername[NMAX+1], lusername[NMAX+1];
86eb6c9e	64	char rpassword[NMAX+1];
e5321f7b	65	char name[NMAX+1];
b4389814	66	char *rhost;
86eb6c9e	67
88a01c09 BJ	68	main(argc, argv)
	69	char **argv;
	70	{
	71	register char *namep;
	72	int t, f, c;
f570e1ff BJ	73	int invalid;
	74	int quietlog;
	75	int i;
	76	FILE *nlfd;
88a01c09	77	char *ttyn;
b4389814 BJ	78	int ldisc = 0, zero = 0;
b4389814 BJ	79	FILE *hostf; int first = 1;
88a01c09 BJ	80
	81	alarm(60);
	82	signal(SIGQUIT, SIG_IGN);
	83	signal(SIGINT, SIG_IGN);
	84	nice(-100);
	85	nice(20);
	86	nice(0);
4f8d3876	87	if (argc > 1 && !strcmp(argv[1], "-r")) {
86eb6c9e	88	rflag++;
4f8d3876	89	rhost = argv[2];
b4389814	90	argc = 1;
4f8d3876 BJ	91	getstr(rusername, sizeof (rusername), "remuser");
4f8d3876 BJ	92	getstr(lusername, sizeof (lusername), "locuser");
86eb6c9e	93	getstr(term+5, sizeof(term)-5, "Terminal type");
4f8d3876 BJ	94	if (getuid())
4f8d3876 BJ	95	goto abnormal;
b4389814 BJ	96	setpwent();
b4389814 BJ	97	pwd = getpwnam(lusername);
4f8d3876	98	endpwent();
703f91ff	99	if (pwd == NULL)
4f8d3876	100	goto abnormal;
1886582e	101	hostf = pwd->pw_uid ? fopen("/etc/hosts.equiv", "r") : 0;
b4389814 BJ	102	again:
b4389814 BJ	103	if (hostf) {
fd29004e CL	104	char ahost[32];
	105
	106	while (fgets(ahost, sizeof (ahost), hostf)) {
	107	char *user;
	108
32e13142 CL	109	if ((user = index(ahost, '\n')) != 0)
	110	*user++ = '\0';
	111	if ((user = index(ahost, ' ')) != 0)
	112	*user++ = '\0';
fd29004e CL	113	if (!strcmp(rhost, ahost) &&
	114	!strcmp(rusername, user ?
	115	user : lusername)) {
	116	fclose(hostf);
	117	goto normal;
	118	}
4f8d3876	119	}
fd29004e	120	fclose(hostf);
b4389814 BJ	121	}
b4389814 BJ	122	if (first == 1) {
fd29004e CL	123	char *rhosts = ".rhosts";
	124	struct stat sbuf;
	125
b4389814 BJ	126	first = 0;
	127	if (chdir(pwd->pw_dir) < 0)
	128	goto again;
fd29004e CL	129	if (lstat(rhosts, &sbuf) < 0)
	130	goto again;
	131	if ((sbuf.st_mode & S_IFMT) == S_IFLNK) {
	132	printf("login: .rhosts is a soft link.\r\n");
fd29004e CL	133	goto abnormal;
	134	}
	135	hostf = fopen(rhosts, "r");
	136	fstat(fileno(hostf), &sbuf);
	137	if ((int) sbuf.st_uid != pwd->pw_uid &&
	138	(int) sbuf.st_uid != 0) {
	139	printf("login: Bad .rhosts ownership.\r\n");
	140	fclose(hostf);
	141	goto abnormal;
	142	}
	143	goto again;
b4389814	144	}
4f8d3876	145	abnormal:
b4389814 BJ	146	rhost = 0;
b4389814 BJ	147	rflag = -1;
86eb6c9e	148	}
b4389814	149	normal:
3479a16a	150	ioctl(0, TIOCLSET, &zero); /* XXX */
c95ed2b2	151	ioctl(0, TIOCNXCL, 0);
4f8d3876 BJ	152	ioctl(0, FIONBIO, &zero);
4f8d3876 BJ	153	ioctl(0, FIOASYNC, &zero);
3479a16a	154	ioctl(0, TIOCGETP, &ttyb); /* XXX */
86eb6c9e BJ	155	if (rflag) {
	156	char *cp = index(term, '/');
	157	if (cp) {
	158	int i;
	159	*cp++ = 0;
	160	for (i = 0; i < NSPEEDS; i++)
	161	if (!strcmp(speeds[i], cp)) {
	162	ttyb.sg_ispeed = ttyb.sg_ospeed = i;
	163	break;
	164	}
	165	}
	166	ttyb.sg_flags = ECHO\|CRMOD\|ANYP\|XTABS;
	167	}
3479a16a SL	168	ioctl(0, TIOCSETP, &ttyb); /* XXX */
3479a16a SL	169	ioctl(0, TIOCCSET, &tc);
88a01c09 BJ	170	for (t=3; t<20; t++)
	171	close(t);
	172	ttyn = ttyname(0);
f570e1ff	173	if (ttyn==(char *)0)
88a01c09	174	ttyn = "/dev/tty??";
f570e1ff BJ	175	do {
f570e1ff BJ	176	ldisc = 0;
c95ed2b2	177	ioctl(0, TIOCSETD, &ldisc);
f570e1ff BJ	178	invalid = FALSE;
	179	SCPYN(utmp.ut_name, "");
	180	if (argc>1) {
	181	SCPYN(utmp.ut_name, argv[1]);
	182	argc = 0;
	183	}
4f8d3876	184	if (rflag) {
3479a16a	185	SCPYN(utmp.ut_name, lusername);
4f8d3876 BJ	186	if (rflag == -1)
	187	rflag = 0;
	188	} else
b4389814 BJ	189	while (utmp.ut_name[0] == '\0') {
	190	namep = utmp.ut_name;
	191	{ char hostname[32];
	192	gethostname(hostname, sizeof (hostname));
	193	printf("%s login: ", hostname); }
	194	while ((c = getchar()) != '\n') {
	195	if (c == ' ')
	196	c = '_';
	197	if (c == EOF)
	198	exit(0);
	199	if (namep < utmp.ut_name+NMAX)
	200	*namep++ = c;
	201	}
f570e1ff	202	}
b4389814 BJ	203	if (rhost == 0) {
	204	setpwent();
	205	if ((pwd = getpwnam(utmp.ut_name)) == NULL)
	206	pwd = &nouser;
	207	endpwent();
f570e1ff	208	}
f570e1ff BJ	209	if (!strcmp(pwd->pw_shell, "/bin/csh")) {
	210	ldisc = NTTYDISC;
	211	ioctl(0, TIOCSETD, &ldisc);
	212	}
b4389814 BJ	213	if (rhost == 0) {
	214	if (*pwd->pw_passwd != '\0') {
	215	char *pp;
	216	nice(-4);
	217	if (rflag == 0)
	218	pp = getpass("Password:");
	219	else
	220	pp = rpassword;
	221	namep = crypt(pp,pwd->pw_passwd);
	222	nice(4);
	223	if (strcmp(namep, pwd->pw_passwd))
	224	invalid = TRUE;
	225	}
f570e1ff BJ	226	}
	227	if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) {
	228	/* logins are disabled except for root */
	229	while ((c = getc(nlfd)) != EOF)
	230	putchar(c);
	231	fflush(stdout);
	232	sleep(5);
	233	exit(0);
	234	}
	235	if (!invalid && pwd->pw_uid == 0 &&
	236	!rootterm(ttyn+sizeof("/dev/")-1)) {
4f8d3876 BJ	237	logerr("ROOT LOGIN REFUSED %s",
4f8d3876 BJ	238	ttyn+sizeof("/dev/")-1);
f570e1ff BJ	239	invalid = TRUE;
	240	}
	241	if (invalid) {
88a01c09	242	printf("Login incorrect\n");
4f8d3876 BJ	243	if (ttyn[sizeof("/dev/tty")-1] == 'd')
	244	logerr("BADDIALUP %s %s\n",
	245	ttyn+sizeof("/dev/")-1, utmp.ut_name);
88a01c09	246	}
f570e1ff BJ	247	if (*pwd->pw_shell == '\0')
	248	pwd->pw_shell = "/bin/sh";
	249	i = strlen(pwd->pw_shell);
	250	if (chdir(pwd->pw_dir) < 0 && !invalid ) {
	251	if (chdir("/") < 0) {
	252	printf("No directory!\n");
	253	invalid = TRUE;
	254	} else {
	255	printf("No directory! Logging in with home=/\n");
	256	pwd->pw_dir = "/";
	257	}
88a01c09	258	}
86eb6c9e BJ	259	if (rflag && invalid)
86eb6c9e BJ	260	exit(1);
f570e1ff	261	} while (invalid);
88a01c09	262
86eb6c9e	263
88a01c09 BJ	264	time(&utmp.ut_time);
	265	t = ttyslot();
	266	if (t>0 && (f = open("/etc/utmp", 1)) >= 0) {
	267	lseek(f, (long)(t*sizeof(utmp)), 0);
	268	SCPYN(utmp.ut_line, rindex(ttyn, '/')+1);
	269	write(f, (char *)&utmp, sizeof(utmp));
	270	close(f);
	271	}
	272	if (t>0 && (f = open("/usr/adm/wtmp", 1)) >= 0) {
	273	lseek(f, 0L, 2);
	274	write(f, (char *)&utmp, sizeof(utmp));
	275	close(f);
	276	}
4f8d3876	277	quietlog = 0;
f570e1ff	278	if (access(qlog, 0) == 0)
4f8d3876 BJ	279	quietlog = 1;
4f8d3876 BJ	280	if ((f = open(lastlog, 2)) >= 0) {
f570e1ff BJ	281	struct lastlog ll;
	282
	283	lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
	284	if (read(f, (char *) &ll, sizeof ll) == sizeof ll &&
	285	ll.ll_time != 0) {
4f8d3876	286	if (quietlog == 0)
f570e1ff BJ	287	printf("Last login: %.s on %.s\n"
	288	, 24-5
	289	, (char *) ctime(&ll.ll_time)
	290	, sizeof(ll.ll_line)
	291	, ll.ll_line
	292	);
	293	}
	294	lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
	295	time(&ll.ll_time);
	296	SCPYN(ll.ll_line, rindex(ttyn, '/')+1);
	297	write(f, (char *) &ll, sizeof ll);
	298	close(f);
	299	}
88a01c09	300	chown(ttyn, pwd->pw_uid, pwd->pw_gid);
3479a16a	301	chmod(ttyn, 0622);
88a01c09	302	setgid(pwd->pw_gid);
e5321f7b KM	303	strncpy(name, utmp.ut_name, NMAX);
e5321f7b KM	304	name[NMAX] = '\0';
b1198826	305	initgroups(name, pwd->pw_gid);
88a01c09	306	setuid(pwd->pw_uid);
88a01c09 BJ	307	environ = envinit;
	308	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
	309	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
4f8d3876	310	if (term[strlen("TERM=")] == 0)
86eb6c9e	311	strncat(term, stypeof(ttyn), sizeof(term)-6);
f570e1ff	312	strncat(user, pwd->pw_name, sizeof(user)-6);
88a01c09 BJ	313	if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
	314	namep = pwd->pw_shell;
	315	else
	316	namep++;
	317	strcat(minusnam, namep);
	318	alarm(0);
b4389814	319	umask(022);
4f8d3876 BJ	320	if (ttyn[sizeof("/dev/tty")-1] == 'd')
	321	logerr("DIALUP %s %s\n", ttyn+sizeof("/dev/")-1, pwd->pw_name);
	322	if (!quietlog) {
f570e1ff BJ	323	showmotd();
	324	strcat(maildir, pwd->pw_name);
	325	if (access(maildir,4)==0) {
	326	struct stat statb;
	327	stat(maildir, &statb);
	328	if (statb.st_size)
	329	printf("You have mail.\n");
	330	}
	331	}
	332
88a01c09 BJ	333	signal(SIGQUIT, SIG_DFL);
88a01c09 BJ	334	signal(SIGINT, SIG_DFL);
5f87416f	335	signal(SIGTSTP, SIG_IGN);
88a01c09	336	execlp(pwd->pw_shell, minusnam, 0);
f570e1ff	337	perror(pwd->pw_shell);
88a01c09 BJ	338	printf("No shell\n");
	339	exit(0);
	340	}
	341
	342	int stopmotd;
	343	catch()
	344	{
1886582e	345
88a01c09 BJ	346	signal(SIGINT, SIG_IGN);
	347	stopmotd++;
	348	}
	349
f570e1ff	350	rootterm(tty)
1886582e	351	char *tty;
f570e1ff BJ	352	{
f570e1ff BJ	353	register FILE *fd;
1886582e	354	char buf[100];
f570e1ff BJ	355
	356	if ((fd = fopen(securetty, "r")) == NULL)
	357	return(1);
	358	while (fgets(buf, sizeof buf, fd) != NULL) {
	359	buf[strlen(buf)-1] = '\0';
	360	if (strcmp(tty, buf) == 0) {
	361	fclose(fd);
	362	return(1);
	363	}
	364	}
	365	fclose(fd);
	366	return(0);
	367	}
	368
88a01c09 BJ	369	showmotd()
	370	{
	371	FILE *mf;
	372	register c;
	373
	374	signal(SIGINT, catch);
f570e1ff BJ	375	if ((mf = fopen("/etc/motd","r")) != NULL) {
f570e1ff BJ	376	while ((c = getc(mf)) != EOF && stopmotd == 0)
88a01c09 BJ	377	putchar(c);
	378	fclose(mf);
	379	}
	380	signal(SIGINT, SIG_IGN);
	381	}
	382
f570e1ff	383	#undef UNKNOWN
88a01c09 BJ	384	#define UNKNOWN "su"
	385
	386	char *
	387	stypeof(ttyid)
	388	char *ttyid;
	389	{
	390	static char typebuf[16];
	391	char buf[50];
	392	register FILE *f;
	393	register char p, t, *q;
	394
	395	if (ttyid == NULL)
	396	return (UNKNOWN);
	397	f = fopen("/etc/ttytype", "r");
	398	if (f == NULL)
	399	return (UNKNOWN);
	400	/* split off end of name */
	401	for (p = q = ttyid; *p != 0; p++)
	402	if (*p == '/')
	403	q = p + 1;
	404
	405	/* scan the file */
	406	while (fgets(buf, sizeof buf, f) != NULL)
	407	{
f570e1ff	408	for (t=buf; t!=' ' && t != '\t'; t++)
88a01c09 BJ	409	;
88a01c09 BJ	410	*t++ = 0;
f570e1ff BJ	411	while (t == ' ' \|\| t == '\t')
f570e1ff BJ	412	t++;
88a01c09 BJ	413	for (p=t; *p>' '; p++)
	414	;
	415	*p = 0;
	416	if (strcmp(q,t)==0) {
	417	strcpy(typebuf, buf);
	418	fclose(f);
	419	return (typebuf);
	420	}
	421	}
	422	fclose (f);
	423	return (UNKNOWN);
	424	}
86eb6c9e BJ	425
	426	getstr(buf, cnt, err)
	427	char *buf;
	428	int cnt;
	429	char *err;
	430	{
	431	char c;
	432
	433	do {
	434	if (read(0, &c, 1) != 1)
	435	exit(1);
	436	if (--cnt < 0) {
	437	printf("%s too long\r\n", err);
	438	exit(1);
	439	}
	440	*buf++ = c;
	441	} while (c != 0);
	442	}
4f8d3876 BJ	443
	444	logerr(fmt, a1, a2, a3)
	445	char fmt, a1, a2, a3;
	446	{
	447
	448	}