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

static char *sccsid = "@(#)login.c	4.1 (Berkeley) %G%";
/*
 * login [ name ]
 */

#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)

char	user[20];
char	maildir[30] =	"/usr/spool/mail/";
char	lastlog[] =	"/usr/adm/lastlog";
struct	passwd nouser = {"", "nope"};
struct	sgttyb ttyb;
struct	utmp utmp;
char	minusnam[16] = "-";
char	homedir[64] = "HOME=";
char	shell[64] = "SHELL=";
char	term[64] = "TERM=";
char	*envinit[] = {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user,0};
struct	passwd *pwd;

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

main(argc, argv)
char **argv;
{
	register char *namep;
	int t, f, c;
	char *ttyn;
	int ldisc = 0;

	alarm(60);
	signal(SIGQUIT, SIG_IGN);
	signal(SIGINT, SIG_IGN);
	nice(-100);
	nice(20);
	nice(0);
	ioctl(0, TIOCLSET, 0);
	ioctl(0, TIOCNXCL, 0);
	gtty(0, &ttyb);
	ttyb.sg_erase = '#';
	ttyb.sg_kill = '@';
	stty(0, &ttyb);
	for (t=3; t<20; t++)
		close(t);
	ttyn = ttyname(0);
	if (ttyn==0)
		ttyn = "/dev/tty??";

    loop:
	ldisc = 0;
	ioctl(0, TIOCSETD, &ldisc);
	SCPYN(utmp.ut_name, "");
	if (argc>1) {
		SCPYN(utmp.ut_name, argv[1]);
		argc = 0;
	}
	while (utmp.ut_name[0] == '\0') {
		namep = utmp.ut_name;
		printf("login: ");
		while ((c = getchar()) != '\n') {
			if(c == ' ')
				c = '_';
			if (c == EOF)
				exit(0);
			if (namep < utmp.ut_name+NMAX)
				*namep++ = c;
		}
	}
	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 (*pwd->pw_passwd != '\0') {
		nice(-4);
		namep = crypt(getpass("Password:"),pwd->pw_passwd);
		nice(4);
		if (strcmp(namep, pwd->pw_passwd)) {
bad:
			printf("Login incorrect\n");
			if (ttyn[LMAX] == 'd') {
				FILE *console = fopen("/dev/console", "w");
				if (console != NULL) {
					fprintf(console, "\r\nBADDIALUP %s %s\r\n", ttyn+5, utmp.ut_name);
					fclose(console);
				}
			}
			goto loop;
		}
	}
	sprintf(user, "USER=%.*s", NMAX, pwd->pw_name);
	if (pwd->pw_uid == 0 && ttyn[5] != 'c')
		goto bad;
	if (ttyn[LMAX] == 'd') {
		FILE *console = fopen("/dev/console", "w");
		if (console != NULL) {
			fprintf(console, "\r\nDIALUP %s %s\r\n", ttyn+5, pwd->pw_name);
			fclose(console);
		}
	}
	if((f = open(lastlog, 2)) >= 0) {
		struct lastlog ll;

		lseek(f, pwd->pw_uid * sizeof (struct lastlog), 0);
		if (read(f, (char *) &ll, sizeof ll) == sizeof ll && ll.ll_time != 0) {
			register char *ep = (char *) ctime(&ll.ll_time);
			printf("Last login: ");
			ep[24 - 5] = 0;
			printf("%s on %.*s\n", ep, LMAX, ll.ll_line);
		}
		lseek(f, pwd->pw_uid * sizeof (struct lastlog), 0);
		time(&ll.ll_time);
		strcpyn(ll.ll_line, ttyn+5, LMAX);
		write(f, (char *) &ll, sizeof ll);
		close(f);
	}
	if(chdir(pwd->pw_dir) < 0) {
		printf("No directory\n");
		goto loop;
	}
	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);
	}
	chown(ttyn, pwd->pw_uid, pwd->pw_gid);
	setgid(pwd->pw_gid);
	setuid(pwd->pw_uid);
	if (*pwd->pw_shell == '\0')
		pwd->pw_shell = "/bin/sh";
	environ = envinit;
	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
	strncat(term, stypeof(ttyn), sizeof(term)-6);
	if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
		namep = pwd->pw_shell;
	else
		namep++;
	strcat(minusnam, namep);
	alarm(0);
	umask(022);
	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);
	execlp(pwd->pw_shell, minusnam, 0);
	printf("No shell\n");
	exit(0);
}

int	stopmotd;
catch()
{
	signal(SIGINT, SIG_IGN);
	stopmotd++;
}

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);
}

#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++ = 0;
		for (p=t; *p>' '; p++)
			;
		*p = 0;
		if (strcmp(q,t)==0) {
			strcpy(typebuf, buf);
			fclose(f);
			return (typebuf);
		}
	}
	fclose (f);
	return (UNKNOWN);
}
Commit	Line	Data
88a01c09 BJ	1	static char *sccsid = "@(#)login.c 4.1 (Berkeley) %G%";
	2	/*
	3	* login [ name ]
	4	*/
	5
	6	#include <sys/types.h>
	7	#include <sgtty.h>
	8	#include <utmp.h>
	9	#include <signal.h>
	10	#include <pwd.h>
	11	#include <stdio.h>
	12	#include <sys/stat.h>
	13	#include <lastlog.h>
	14	#define SCPYN(a, b) strncpy(a, b, sizeof(a))
	15
	16	#define NMAX sizeof(utmp.ut_name)
	17	#define LMAX sizeof(utmp.ut_line)
	18
	19	char user[20];
	20	char maildir[30] = "/usr/spool/mail/";
	21	char lastlog[] = "/usr/adm/lastlog";
	22	struct passwd nouser = {"", "nope"};
	23	struct sgttyb ttyb;
	24	struct utmp utmp;
	25	char minusnam[16] = "-";
	26	char homedir[64] = "HOME=";
	27	char shell[64] = "SHELL=";
	28	char term[64] = "TERM=";
	29	char *envinit[] = {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", term, user,0};
	30	struct passwd *pwd;
	31
	32	struct passwd *getpwnam();
	33	char *strcat();
	34	int setpwent();
	35	char *ttyname();
	36	char *crypt();
	37	char *getpass();
	38	char *rindex();
	39	char *stypeof();
	40	extern char **environ;
	41
	42	main(argc, argv)
	43	char **argv;
	44	{
	45	register char *namep;
	46	int t, f, c;
	47	char *ttyn;
	48	int ldisc = 0;
	49
	50	alarm(60);
	51	signal(SIGQUIT, SIG_IGN);
	52	signal(SIGINT, SIG_IGN);
	53	nice(-100);
	54	nice(20);
	55	nice(0);
	56	ioctl(0, TIOCLSET, 0);
	57	ioctl(0, TIOCNXCL, 0);
	58	gtty(0, &ttyb);
	59	ttyb.sg_erase = '#';
	60	ttyb.sg_kill = '@';
	61	stty(0, &ttyb);
	62	for (t=3; t<20; t++)
	63	close(t);
	64	ttyn = ttyname(0);
65	if (ttyn==0)
66	ttyn = "/dev/tty??";
67
68	loop:
69	ldisc = 0;
70	ioctl(0, TIOCSETD, &ldisc);
71	SCPYN(utmp.ut_name, "");
72	if (argc>1) {
73	SCPYN(utmp.ut_name, argv[1]);
74	argc = 0;
75	}
76	while (utmp.ut_name[0] == '\0') {
77	namep = utmp.ut_name;
78	printf("login: ");
79	while ((c = getchar()) != '\n') {
80	if(c == ' ')
81	c = '_';
82	if (c == EOF)
83	exit(0);
84	if (namep < utmp.ut_name+NMAX)
85	*namep++ = c;
86	}
87	}
88	setpwent();
89	if ((pwd = getpwnam(utmp.ut_name)) == NULL)
90	pwd = &nouser;
91	endpwent();
92	if (!strcmp(pwd->pw_shell, "/bin/csh")) {
93	ldisc = NTTYDISC;
94	ioctl(0, TIOCSETD, &ldisc);
95	}
96	if (*pwd->pw_passwd != '\0') {
97	nice(-4);
98	namep = crypt(getpass("Password:"),pwd->pw_passwd);
99	nice(4);
100	if (strcmp(namep, pwd->pw_passwd)) {
101	bad:
102	printf("Login incorrect\n");
103	if (ttyn[LMAX] == 'd') {
104	FILE *console = fopen("/dev/console", "w");
105	if (console != NULL) {
106	fprintf(console, "\r\nBADDIALUP %s %s\r\n", ttyn+5, utmp.ut_name);
107	fclose(console);
108	}
109	}
110	goto loop;
111	}
112	}
113	sprintf(user, "USER=%.*s", NMAX, pwd->pw_name);
114	if (pwd->pw_uid == 0 && ttyn[5] != 'c')
115	goto bad;
116	if (ttyn[LMAX] == 'd') {
117	FILE *console = fopen("/dev/console", "w");
118	if (console != NULL) {
119	fprintf(console, "\r\nDIALUP %s %s\r\n", ttyn+5, pwd->pw_name);
120	fclose(console);
121	}
122	}
123	if((f = open(lastlog, 2)) >= 0) {
124	struct lastlog ll;
125
126	lseek(f, pwd->pw_uid * sizeof (struct lastlog), 0);
127	if (read(f, (char *) &ll, sizeof ll) == sizeof ll && ll.ll_time != 0) {
128	register char ep = (char ) ctime(&ll.ll_time);
129	printf("Last login: ");
130	ep[24 - 5] = 0;
131	printf("%s on %.*s\n", ep, LMAX, ll.ll_line);
132	}
133	lseek(f, pwd->pw_uid * sizeof (struct lastlog), 0);
134	time(&ll.ll_time);
135	strcpyn(ll.ll_line, ttyn+5, LMAX);
136	write(f, (char *) &ll, sizeof ll);
137	close(f);
138	}
139	if(chdir(pwd->pw_dir) < 0) {
140	printf("No directory\n");
141	goto loop;
142	}
143	time(&utmp.ut_time);
144	t = ttyslot();
145	if (t>0 && (f = open("/etc/utmp", 1)) >= 0) {
146	lseek(f, (long)(t*sizeof(utmp)), 0);
147	SCPYN(utmp.ut_line, rindex(ttyn, '/')+1);
148	write(f, (char *)&utmp, sizeof(utmp));
149	close(f);
150	}
151	if (t>0 && (f = open("/usr/adm/wtmp", 1)) >= 0) {
152	lseek(f, 0L, 2);
153	write(f, (char *)&utmp, sizeof(utmp));
154	close(f);
155	}
156	chown(ttyn, pwd->pw_uid, pwd->pw_gid);
157	setgid(pwd->pw_gid);
158	setuid(pwd->pw_uid);
159	if (*pwd->pw_shell == '\0')
160	pwd->pw_shell = "/bin/sh";
161	environ = envinit;
162	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
163	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
164	strncat(term, stypeof(ttyn), sizeof(term)-6);
165	if ((namep = rindex(pwd->pw_shell, '/')) == NULL)
166	namep = pwd->pw_shell;
167	else
168	namep++;
169	strcat(minusnam, namep);
170	alarm(0);
171	umask(022);
172	showmotd();
173	strcat(maildir, pwd->pw_name);
174	if(access(maildir,4)==0) {
175	struct stat statb;
176	stat(maildir, &statb);
177	if (statb.st_size)
178	printf("You have mail.\n");
179	}
180	signal(SIGQUIT, SIG_DFL);
181	signal(SIGINT, SIG_DFL);
182	execlp(pwd->pw_shell, minusnam, 0);
183	printf("No shell\n");
184	exit(0);
185	}
186
187	int stopmotd;
188	catch()
189	{
190	signal(SIGINT, SIG_IGN);
191	stopmotd++;
192	}
193
194	showmotd()
195	{
196	FILE *mf;
197	register c;
198
199	signal(SIGINT, catch);
200	if((mf = fopen("/etc/motd","r")) != NULL) {
201	while((c = getc(mf)) != EOF && stopmotd == 0)
202	putchar(c);
203	fclose(mf);
204	}
205	signal(SIGINT, SIG_IGN);
206	}
207
208	#define UNKNOWN "su"
209
210	char *
211	stypeof(ttyid)
212	char *ttyid;
213	{
214	static char typebuf[16];
215	char buf[50];
216	register FILE *f;
217	register char p, t, *q;
218
219	if (ttyid == NULL)
220	return (UNKNOWN);
221	f = fopen("/etc/ttytype", "r");
222	if (f == NULL)
223	return (UNKNOWN);
224	/* split off end of name */
225	for (p = q = ttyid; *p != 0; p++)
226	if (*p == '/')
227	q = p + 1;
228
229	/* scan the file */
230	while (fgets(buf, sizeof buf, f) != NULL)
231	{
232	for (t=buf; *t!=' '; t++)
233	;
234	*t++ = 0;
235	for (p=t; *p>' '; p++)
236	;
237	*p = 0;
238	if (strcmp(q,t)==0) {
239	strcpy(typebuf, buf);
240	fclose(f);
241	return (typebuf);
242	}
243	}
244	fclose (f);
245	return (UNKNOWN);
246	}