[unix-history] / usr / src / usr.bin / passwd / chsh.sh

#ifndef lint
static char *sccsid = "@(#)chsh.sh	4.5 (Berkeley) %G%";
#endif

/*
 * chsh
 */
#include <stdio.h>
#include <signal.h>
#include <pwd.h>
#include <sys/file.h>
#include <time.h>
#include <resource.h>

char	passwd[] = "/etc/passwd";
char	temp[]	 = "/etc/ptmp";
struct	passwd *pwd;
struct	passwd *getpwent();
int	endpwent();
char	*crypt();
char	*getpass();
char	*strcat();
char	buf[BUFSIZ];

main(argc, argv)
register char *argv[];
{
	register int u, fd;
	register FILE *tf;

	if (argc < 2 || argc > 3) {
		printf("Usage: chsh user [ /bin/csh ]\n");
		exit(1);
	}
	if (argc == 2)
		argv[2] = "";
	else {
		if (argv[2][0] != '/')
			argv[2] = strcat(
			    "/bin/\0 12345678901234567890123456789", argv[2]);
		if (strcmp(argv[2], "/bin/csh") &&
		    strcmp(argv[2], "/bin/oldcsh") &&
		    strcmp(argv[2], "/bin/newcsh") &&
		    strcmp(argv[2], "/usr/new/csh") &&
			/* and, for cretins who can't read the manual */
		    strcmp(argv[2], "/bin/sh") &&
		    getuid()) {
			printf(
			    "Only /bin/csh may be specified\n"
			);
			exit(1);
		}
		if (access(argv[2], 1) < 0) {
			printf("%s is not available\n", argv[2]);
			exit(1);
		}
	}
	unlimit(RLIMIT_CPU);
	unlimit(RLIMIT_FSIZE);
	while ((pwd=getpwent()) != NULL) {
		if (strcmp(pwd->pw_name, argv[1]) == 0) {
			u = getuid();
			if (u!=0 && u != pwd->pw_uid) {
				printf("Permission denied.\n");
				exit(1);
			}
			break;
		}
	}
	endpwent();

	signal(SIGHUP, SIG_IGN);
	signal(SIGINT, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
	signal(SIGTSTP, SIG_IGN);
	if ((fd = open(temp, O_CREAT|O_EXCL|O_RDWR, 0644)) < 0) {
		printf("Temporary file busy -- try again\n");
		exit(1);
	}
	if ((tf=fdopen(fd, "w")) == NULL) {
		printf("Absurd fdopen failure - seek help\n");
		goto out;
	}
	/*
	 * Copy passwd to temp, replacing matching lines
	 * with new shell.
	 */
	while ((pwd=getpwent()) != NULL) {
		if (strcmp(pwd->pw_name, argv[1]) == 0) {
			u = getuid();
			if (u != 0 && u != pwd->pw_uid) {
				printf("Permission denied.\n");
				goto out;
			}
			pwd->pw_shell = argv[2];
		}
		if (strcmp(pwd->pw_shell, "/bin/sh") == 0)
			pwd->pw_shell = "";
		fprintf(tf, "%s:%s:%d:%d:%s:%s:%s\n"
			, pwd->pw_name
			, pwd->pw_passwd
			, pwd->pw_uid
			, pwd->pw_gid
			, pwd->pw_gecos
			, pwd->pw_dir
			, pwd->pw_shell
		);
	}
	endpwent();
	if (rename(temp, passwd) < 0) {
		fprintf(stderr, "chsh: "); perror("rename");
  out:
		unlink(temp);
		exit(1);
	}
	fclose(tf);
	exit(0);
}

unlimit(lim)
{
	struct rlimit rlim;

	rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
	setrlimit(lim, &rlim);
}
Commit	Line	Data
9f52e30a SL	1	#ifndef lint
	2	static char *sccsid = "@(#)chsh.sh 4.5 (Berkeley) %G%";
	3	#endif
	4
854c8e85 BJ	5	/*
	6	* chsh
	7	*/
	8	#include <stdio.h>
	9	#include <signal.h>
	10	#include <pwd.h>
9f52e30a SL	11	#include <sys/file.h>
	12	#include <time.h>
	13	#include <resource.h>
854c8e85 BJ	14
	15	char passwd[] = "/etc/passwd";
	16	char temp[] = "/etc/ptmp";
	17	struct passwd *pwd;
	18	struct passwd *getpwent();
	19	int endpwent();
	20	char *crypt();
	21	char *getpass();
9f52e30a	22	char *strcat();
854c8e85 BJ	23	char buf[BUFSIZ];
	24
	25	main(argc, argv)
9f52e30a	26	register char *argv[];
854c8e85	27	{
9f52e30a SL	28	register int u, fd;
9f52e30a SL	29	register FILE *tf;
854c8e85	30
9f52e30a	31	if (argc < 2 \|\| argc > 3) {
1f096eb2	32	printf("Usage: chsh user [ /bin/csh ]\n");
9f52e30a	33	exit(1);
854c8e85 BJ	34	}
	35	if (argc == 2)
	36	argv[2] = "";
9f52e30a SL	37	else {
	38	if (argv[2][0] != '/')
	39	argv[2] = strcat(
	40	"/bin/\0 12345678901234567890123456789", argv[2]);
	41	if (strcmp(argv[2], "/bin/csh") &&
	42	strcmp(argv[2], "/bin/oldcsh") &&
	43	strcmp(argv[2], "/bin/newcsh") &&
	44	strcmp(argv[2], "/usr/new/csh") &&
	45	/* and, for cretins who can't read the manual */
	46	strcmp(argv[2], "/bin/sh") &&
	47	getuid()) {
	48	printf(
	49	"Only /bin/csh may be specified\n"
	50	);
78ffcf9e BJ	51	exit(1);
78ffcf9e BJ	52	}
9f52e30a SL	53	if (access(argv[2], 1) < 0) {
	54	printf("%s is not available\n", argv[2]);
	55	exit(1);
	56	}
	57	}
	58	unlimit(RLIMIT_CPU);
	59	unlimit(RLIMIT_FSIZE);
	60	while ((pwd=getpwent()) != NULL) {
	61	if (strcmp(pwd->pw_name, argv[1]) == 0) {
854c8e85	62	u = getuid();
9f52e30a	63	if (u!=0 && u != pwd->pw_uid) {
854c8e85	64	printf("Permission denied.\n");
9f52e30a	65	exit(1);
854c8e85	66	}
9f52e30a	67	break;
854c8e85	68	}
9f52e30a	69	}
854c8e85	70	endpwent();
854c8e85	71
9f52e30a SL	72	signal(SIGHUP, SIG_IGN);
	73	signal(SIGINT, SIG_IGN);
	74	signal(SIGQUIT, SIG_IGN);
	75	signal(SIGTSTP, SIG_IGN);
	76	if ((fd = open(temp, O_CREAT\|O_EXCL\|O_RDWR, 0644)) < 0) {
854c8e85	77	printf("Temporary file busy -- try again\n");
9f52e30a	78	exit(1);
854c8e85	79	}
9f52e30a SL	80	if ((tf=fdopen(fd, "w")) == NULL) {
	81	printf("Absurd fdopen failure - seek help\n");
	82	goto out;
854c8e85	83	}
9f52e30a SL	84	/*
	85	* Copy passwd to temp, replacing matching lines
	86	* with new shell.
	87	*/
	88	while ((pwd=getpwent()) != NULL) {
	89	if (strcmp(pwd->pw_name, argv[1]) == 0) {
854c8e85	90	u = getuid();
9f52e30a	91	if (u != 0 && u != pwd->pw_uid) {
854c8e85 BJ	92	printf("Permission denied.\n");
	93	goto out;
	94	}
	95	pwd->pw_shell = argv[2];
	96	}
9f52e30a SL	97	if (strcmp(pwd->pw_shell, "/bin/sh") == 0)
	98	pwd->pw_shell = "";
	99	fprintf(tf, "%s:%s:%d:%d:%s:%s:%s\n"
	100	, pwd->pw_name
	101	, pwd->pw_passwd
	102	, pwd->pw_uid
	103	, pwd->pw_gid
	104	, pwd->pw_gecos
	105	, pwd->pw_dir
	106	, pwd->pw_shell
	107	);
854c8e85 BJ	108	}
854c8e85 BJ	109	endpwent();
9f52e30a SL	110	if (rename(temp, passwd) < 0) {
	111	fprintf(stderr, "chsh: "); perror("rename");
	112	out:
	113	unlink(temp);
	114	exit(1);
854c8e85	115	}
9f52e30a SL	116	fclose(tf);
	117	exit(0);
	118	}
854c8e85	119
9f52e30a SL	120	unlimit(lim)
	121	{
	122	struct rlimit rlim;
854c8e85	123
9f52e30a SL	124	rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
9f52e30a SL	125	setrlimit(lim, &rlim);
854c8e85	126	}