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

static	char *sccsid = "@(#)login.c	4.21 83/03/31";
/*
 * 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	*rindex();
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) {
			if (strcmp(rusername, lusername))
				printf("%s: No such user\r\n", lusername);
			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 (index(ahost, '\n'))
					*index(ahost, '\n') = 0;
				user = index(ahost, ' ');
				if (user)
					*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");
			        fclose(hostf);
				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 (rflag)
		return(1);
	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
fd29004e	1	static char *sccsid = "@(#)login.c 4.21 83/03/31";
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();
	53	char *rindex();
	54	char *stypeof();
	55	extern char **environ;
	56
3479a16a SL	57	struct ttychars tc = {
	58	CERASE, CKILL, CINTR, CQUIT, CSTART,
	59	CSTOP, CEOF, CBRK, CSUSP, CDSUSP,
	60	CRPRNT, CFLUSH, CWERASE,CLNEXT
841d84b0 BJ	61	};
841d84b0 BJ	62
86eb6c9e	63	int rflag;
b4389814	64	char rusername[NMAX+1], lusername[NMAX+1];
86eb6c9e	65	char rpassword[NMAX+1];
e5321f7b	66	char name[NMAX+1];
b4389814	67	char *rhost;
86eb6c9e	68
88a01c09 BJ	69	main(argc, argv)
	70	char **argv;
	71	{
	72	register char *namep;
	73	int t, f, c;
f570e1ff BJ	74	int invalid;
	75	int quietlog;
	76	int i;
	77	FILE *nlfd;
88a01c09	78	char *ttyn;
b4389814 BJ	79	int ldisc = 0, zero = 0;
b4389814 BJ	80	FILE *hostf; int first = 1;
88a01c09 BJ	81
	82	alarm(60);
	83	signal(SIGQUIT, SIG_IGN);
	84	signal(SIGINT, SIG_IGN);
	85	nice(-100);
	86	nice(20);
	87	nice(0);
4f8d3876	88	if (argc > 1 && !strcmp(argv[1], "-r")) {
86eb6c9e	89	rflag++;
4f8d3876	90	rhost = argv[2];
b4389814	91	argc = 1;
4f8d3876 BJ	92	getstr(rusername, sizeof (rusername), "remuser");
4f8d3876 BJ	93	getstr(lusername, sizeof (lusername), "locuser");
86eb6c9e	94	getstr(term+5, sizeof(term)-5, "Terminal type");
4f8d3876 BJ	95	if (getuid())
4f8d3876 BJ	96	goto abnormal;
b4389814 BJ	97	setpwent();
b4389814 BJ	98	pwd = getpwnam(lusername);
4f8d3876	99	endpwent();
b4389814	100	if (pwd == NULL) {
4f8d3876 BJ	101	if (strcmp(rusername, lusername))
	102	printf("%s: No such user\r\n", lusername);
	103	goto abnormal;
b4389814	104	}
1886582e	105	hostf = pwd->pw_uid ? fopen("/etc/hosts.equiv", "r") : 0;
b4389814 BJ	106	again:
b4389814 BJ	107	if (hostf) {
fd29004e CL	108	char ahost[32];
	109
	110	while (fgets(ahost, sizeof (ahost), hostf)) {
	111	char *user;
	112
	113	if (index(ahost, '\n'))
	114	*index(ahost, '\n') = 0;
	115	user = index(ahost, ' ');
	116	if (user)
	117	*user++ = 0;
	118	if (!strcmp(rhost, ahost) &&
	119	!strcmp(rusername, user ?
	120	user : lusername)) {
	121	fclose(hostf);
	122	goto normal;
	123	}
4f8d3876	124	}
fd29004e	125	fclose(hostf);
b4389814 BJ	126	}
b4389814 BJ	127	if (first == 1) {
fd29004e CL	128	char *rhosts = ".rhosts";
	129	struct stat sbuf;
	130
b4389814 BJ	131	first = 0;
	132	if (chdir(pwd->pw_dir) < 0)
	133	goto again;
fd29004e CL	134	if (lstat(rhosts, &sbuf) < 0)
	135	goto again;
	136	if ((sbuf.st_mode & S_IFMT) == S_IFLNK) {
	137	printf("login: .rhosts is a soft link.\r\n");
	138	fclose(hostf);
	139	goto abnormal;
	140	}
	141	hostf = fopen(rhosts, "r");
	142	fstat(fileno(hostf), &sbuf);
	143	if ((int) sbuf.st_uid != pwd->pw_uid &&
	144	(int) sbuf.st_uid != 0) {
	145	printf("login: Bad .rhosts ownership.\r\n");
	146	fclose(hostf);
	147	goto abnormal;
	148	}
	149	goto again;
b4389814	150	}
4f8d3876	151	abnormal:
b4389814 BJ	152	rhost = 0;
b4389814 BJ	153	rflag = -1;
86eb6c9e	154	}
b4389814	155	normal:
3479a16a	156	ioctl(0, TIOCLSET, &zero); /* XXX */
c95ed2b2	157	ioctl(0, TIOCNXCL, 0);
4f8d3876 BJ	158	ioctl(0, FIONBIO, &zero);
4f8d3876 BJ	159	ioctl(0, FIOASYNC, &zero);
3479a16a	160	ioctl(0, TIOCGETP, &ttyb); /* XXX */
86eb6c9e BJ	161	if (rflag) {
	162	char *cp = index(term, '/');
	163	if (cp) {
	164	int i;
	165	*cp++ = 0;
	166	for (i = 0; i < NSPEEDS; i++)
	167	if (!strcmp(speeds[i], cp)) {
	168	ttyb.sg_ispeed = ttyb.sg_ospeed = i;
	169	break;
	170	}
	171	}
	172	ttyb.sg_flags = ECHO\|CRMOD\|ANYP\|XTABS;
	173	}
3479a16a SL	174	ioctl(0, TIOCSETP, &ttyb); /* XXX */
3479a16a SL	175	ioctl(0, TIOCCSET, &tc);
88a01c09 BJ	176	for (t=3; t<20; t++)
	177	close(t);
	178	ttyn = ttyname(0);
f570e1ff	179	if (ttyn==(char *)0)
88a01c09	180	ttyn = "/dev/tty??";
f570e1ff BJ	181	do {
f570e1ff BJ	182	ldisc = 0;
c95ed2b2	183	ioctl(0, TIOCSETD, &ldisc);
f570e1ff BJ	184	invalid = FALSE;
	185	SCPYN(utmp.ut_name, "");
	186	if (argc>1) {
	187	SCPYN(utmp.ut_name, argv[1]);
	188	argc = 0;
	189	}
4f8d3876	190	if (rflag) {
3479a16a	191	SCPYN(utmp.ut_name, lusername);
4f8d3876 BJ	192	if (rflag == -1)
	193	rflag = 0;
	194	} else
b4389814 BJ	195	while (utmp.ut_name[0] == '\0') {
	196	namep = utmp.ut_name;
	197	{ char hostname[32];
	198	gethostname(hostname, sizeof (hostname));
	199	printf("%s login: ", hostname); }
	200	while ((c = getchar()) != '\n') {
	201	if (c == ' ')
	202	c = '_';
	203	if (c == EOF)
	204	exit(0);
	205	if (namep < utmp.ut_name+NMAX)
	206	*namep++ = c;
	207	}
f570e1ff	208	}
b4389814 BJ	209	if (rhost == 0) {
	210	setpwent();
	211	if ((pwd = getpwnam(utmp.ut_name)) == NULL)
	212	pwd = &nouser;
	213	endpwent();
f570e1ff	214	}
f570e1ff BJ	215	if (!strcmp(pwd->pw_shell, "/bin/csh")) {
	216	ldisc = NTTYDISC;
	217	ioctl(0, TIOCSETD, &ldisc);
	218	}
b4389814 BJ	219	if (rhost == 0) {
	220	if (*pwd->pw_passwd != '\0') {
	221	char *pp;
	222	nice(-4);
	223	if (rflag == 0)
	224	pp = getpass("Password:");
	225	else
	226	pp = rpassword;
	227	namep = crypt(pp,pwd->pw_passwd);
	228	nice(4);
	229	if (strcmp(namep, pwd->pw_passwd))
	230	invalid = TRUE;
	231	}
f570e1ff BJ	232	}
	233	if (pwd->pw_uid != 0 && (nlfd = fopen(nolog, "r")) > 0) {
	234	/* logins are disabled except for root */
	235	while ((c = getc(nlfd)) != EOF)
	236	putchar(c);
	237	fflush(stdout);
	238	sleep(5);
	239	exit(0);
	240	}
	241	if (!invalid && pwd->pw_uid == 0 &&
	242	!rootterm(ttyn+sizeof("/dev/")-1)) {
4f8d3876 BJ	243	logerr("ROOT LOGIN REFUSED %s",
4f8d3876 BJ	244	ttyn+sizeof("/dev/")-1);
f570e1ff BJ	245	invalid = TRUE;
	246	}
	247	if (invalid) {
88a01c09	248	printf("Login incorrect\n");
4f8d3876 BJ	249	if (ttyn[sizeof("/dev/tty")-1] == 'd')
	250	logerr("BADDIALUP %s %s\n",
	251	ttyn+sizeof("/dev/")-1, utmp.ut_name);
88a01c09	252	}
f570e1ff BJ	253	if (*pwd->pw_shell == '\0')
	254	pwd->pw_shell = "/bin/sh";
	255	i = strlen(pwd->pw_shell);
	256	if (chdir(pwd->pw_dir) < 0 && !invalid ) {
	257	if (chdir("/") < 0) {
	258	printf("No directory!\n");
	259	invalid = TRUE;
	260	} else {
	261	printf("No directory! Logging in with home=/\n");
	262	pwd->pw_dir = "/";
	263	}
88a01c09	264	}
86eb6c9e BJ	265	if (rflag && invalid)
86eb6c9e BJ	266	exit(1);
f570e1ff	267	} while (invalid);
88a01c09	268
86eb6c9e	269
88a01c09 BJ	270	time(&utmp.ut_time);
	271	t = ttyslot();
	272	if (t>0 && (f = open("/etc/utmp", 1)) >= 0) {
	273	lseek(f, (long)(t*sizeof(utmp)), 0);
	274	SCPYN(utmp.ut_line, rindex(ttyn, '/')+1);
	275	write(f, (char *)&utmp, sizeof(utmp));
	276	close(f);
	277	}
	278	if (t>0 && (f = open("/usr/adm/wtmp", 1)) >= 0) {
	279	lseek(f, 0L, 2);
	280	write(f, (char *)&utmp, sizeof(utmp));
	281	close(f);
	282	}
4f8d3876	283	quietlog = 0;
f570e1ff	284	if (access(qlog, 0) == 0)
4f8d3876 BJ	285	quietlog = 1;
4f8d3876 BJ	286	if ((f = open(lastlog, 2)) >= 0) {
f570e1ff BJ	287	struct lastlog ll;
	288
	289	lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
	290	if (read(f, (char *) &ll, sizeof ll) == sizeof ll &&
	291	ll.ll_time != 0) {
4f8d3876	292	if (quietlog == 0)
f570e1ff BJ	293	printf("Last login: %.s on %.s\n"
	294	, 24-5
	295	, (char *) ctime(&ll.ll_time)
	296	, sizeof(ll.ll_line)
	297	, ll.ll_line
	298	);
	299	}
	300	lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
	301	time(&ll.ll_time);
	302	SCPYN(ll.ll_line, rindex(ttyn, '/')+1);
	303	write(f, (char *) &ll, sizeof ll);
	304	close(f);
	305	}
88a01c09	306	chown(ttyn, pwd->pw_uid, pwd->pw_gid);
3479a16a	307	chmod(ttyn, 0622);
88a01c09	308	setgid(pwd->pw_gid);
e5321f7b KM	309	strncpy(name, utmp.ut_name, NMAX);
e5321f7b KM	310	name[NMAX] = '\0';
b1198826	311	initgroups(name, pwd->pw_gid);
88a01c09	312	setuid(pwd->pw_uid);
88a01c09 BJ	313	environ = envinit;
	314	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
	315	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
4f8d3876	316	if (term[strlen("TERM=")] == 0)
86eb6c9e	317	strncat(term, stypeof(ttyn), sizeof(term)-6);
f570e1ff	318	strncat(user, pwd->pw_name, sizeof(user)-6);
88a01c09 BJ	319	if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
	320	namep = pwd->pw_shell;
	321	else
	322	namep++;
	323	strcat(minusnam, namep);
	324	alarm(0);
b4389814	325	umask(022);
4f8d3876 BJ	326	if (ttyn[sizeof("/dev/tty")-1] == 'd')
	327	logerr("DIALUP %s %s\n", ttyn+sizeof("/dev/")-1, pwd->pw_name);
	328	if (!quietlog) {
f570e1ff BJ	329	showmotd();
	330	strcat(maildir, pwd->pw_name);
	331	if (access(maildir,4)==0) {
	332	struct stat statb;
	333	stat(maildir, &statb);
	334	if (statb.st_size)
	335	printf("You have mail.\n");
	336	}
	337	}
	338
88a01c09 BJ	339	signal(SIGQUIT, SIG_DFL);
88a01c09 BJ	340	signal(SIGINT, SIG_DFL);
5f87416f	341	signal(SIGTSTP, SIG_IGN);
88a01c09	342	execlp(pwd->pw_shell, minusnam, 0);
f570e1ff	343	perror(pwd->pw_shell);
88a01c09 BJ	344	printf("No shell\n");
	345	exit(0);
	346	}
	347
	348	int stopmotd;
	349	catch()
	350	{
1886582e	351
88a01c09 BJ	352	signal(SIGINT, SIG_IGN);
	353	stopmotd++;
	354	}
	355
f570e1ff	356	rootterm(tty)
1886582e	357	char *tty;
f570e1ff BJ	358	{
f570e1ff BJ	359	register FILE *fd;
1886582e	360	char buf[100];
f570e1ff	361
1886582e BJ	362	if (rflag)
1886582e BJ	363	return(1);
f570e1ff BJ	364	if ((fd = fopen(securetty, "r")) == NULL)
	365	return(1);
	366	while (fgets(buf, sizeof buf, fd) != NULL) {
	367	buf[strlen(buf)-1] = '\0';
	368	if (strcmp(tty, buf) == 0) {
	369	fclose(fd);
	370	return(1);
	371	}
	372	}
	373	fclose(fd);
	374	return(0);
	375	}
	376
88a01c09 BJ	377	showmotd()
	378	{
	379	FILE *mf;
	380	register c;
	381
	382	signal(SIGINT, catch);
f570e1ff BJ	383	if ((mf = fopen("/etc/motd","r")) != NULL) {
f570e1ff BJ	384	while ((c = getc(mf)) != EOF && stopmotd == 0)
88a01c09 BJ	385	putchar(c);
	386	fclose(mf);
	387	}
	388	signal(SIGINT, SIG_IGN);
	389	}
	390
f570e1ff	391	#undef UNKNOWN
88a01c09 BJ	392	#define UNKNOWN "su"
	393
	394	char *
	395	stypeof(ttyid)
	396	char *ttyid;
	397	{
	398	static char typebuf[16];
	399	char buf[50];
	400	register FILE *f;
	401	register char p, t, *q;
	402
	403	if (ttyid == NULL)
	404	return (UNKNOWN);
	405	f = fopen("/etc/ttytype", "r");
	406	if (f == NULL)
	407	return (UNKNOWN);
	408	/* split off end of name */
	409	for (p = q = ttyid; *p != 0; p++)
	410	if (*p == '/')
	411	q = p + 1;
	412
	413	/* scan the file */
	414	while (fgets(buf, sizeof buf, f) != NULL)
	415	{
f570e1ff	416	for (t=buf; t!=' ' && t != '\t'; t++)
88a01c09 BJ	417	;
88a01c09 BJ	418	*t++ = 0;
f570e1ff BJ	419	while (t == ' ' \|\| t == '\t')
f570e1ff BJ	420	t++;
88a01c09 BJ	421	for (p=t; *p>' '; p++)
	422	;
	423	*p = 0;
	424	if (strcmp(q,t)==0) {
	425	strcpy(typebuf, buf);
	426	fclose(f);
	427	return (typebuf);
	428	}
	429	}
	430	fclose (f);
	431	return (UNKNOWN);
	432	}
86eb6c9e BJ	433
	434	getstr(buf, cnt, err)
	435	char *buf;
	436	int cnt;
	437	char *err;
	438	{
	439	char c;
	440
	441	do {
	442	if (read(0, &c, 1) != 1)
	443	exit(1);
	444	if (--cnt < 0) {
	445	printf("%s too long\r\n", err);
	446	exit(1);
	447	}
	448	*buf++ = c;
	449	} while (c != 0);
	450	}
4f8d3876 BJ	451
	452	logerr(fmt, a1, a2, a3)
	453	char fmt, a1, a2, a3;
	454	{
	455
	456	}