[thirdparty/util-linux.git] / login-utils / nologin.c

/*
 * Copyright (C) 2013 Karel Zak <kzak@redhat.com>
 */

#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <getopt.h>

#include "c.h"
#include "nls.h"
#include "pathnames.h"

/*
 * Always return EXIT_FAILURE (1), don't try to be smart!
 */

static void __attribute__((__noreturn__)) usage(void)
{
	FILE *out = stdout;
	fputs(USAGE_HEADER, out);
	fprintf(out,
		_(" %s [options]\n"), program_invocation_short_name);

	fputs(USAGE_SEPARATOR, out);
	fputs(_("Politely refuse a login.\n"), out);

	fputs(USAGE_OPTIONS, out);
	fputs(_(" -c, --command <command>  does nothing (for compatibility with su -c)\n"), out);
	printf(USAGE_HELP_OPTIONS(26));

	printf(USAGE_MAN_TAIL("nologin(8)"));
	exit(EXIT_FAILURE);
}

int main(int argc, char *argv[])
{
	int c, fd = -1;
	struct stat st;
	enum {
		OPT_INIT_FILE = CHAR_MAX + 1,
		OPT_NOPROFILE,
		OPT_NORC,
		OPT_POSIX,
		OPT_RCFILE
	};
	static const struct option longopts[] = {
		{ "command",     required_argument, NULL, 'c'           },
		{ "init-file",   required_argument, NULL, OPT_INIT_FILE },
		{ "interactive", no_argument,       NULL, 'i'           },
		{ "login",       no_argument,       NULL, 'l'           },
		{ "noprofile",   no_argument,       NULL, OPT_NOPROFILE },
		{ "norc",        no_argument,       NULL, OPT_NORC      },
		{ "posix",       no_argument,       NULL, OPT_POSIX     },
		{ "rcfile",      required_argument, NULL, OPT_RCFILE    },
		{ "restricted",  no_argument,       NULL, 'r'           },
		{ "help",        no_argument,       NULL, 'h'           },
		{ "version",     no_argument,       NULL, 'V'           },
		{ NULL, 0, NULL, 0 }
	};

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);

	while ((c = getopt_long(argc, argv, "c:ilrhV", longopts, NULL)) != -1) {
		switch (c) {
		case 'c':
		case OPT_INIT_FILE:
		case 'i':
		case 'l':
		case OPT_NOPROFILE:
		case OPT_NORC:
		case OPT_POSIX:
		case OPT_RCFILE:
		case 'r':
			/* Ignore well known shell command-line options */
			break;
		case 'h':
			usage();
		case 'V':
			print_version(EXIT_FAILURE);	/* yes FAILURE! */
		default:
			errtryhelp(EXIT_FAILURE);
		}
	}

	fd = open(_PATH_NOLOGIN_TXT, O_RDONLY);
	if (fd < 0)
		goto dflt;

	c = fstat(fd, &st);
	if (c < 0 || !S_ISREG(st.st_mode))
		goto dflt;
	else {
		char buf[BUFSIZ];
		ssize_t rd;

		while ((rd = read(fd, buf, sizeof(buf))) > 0)
			ignore_result( write(STDOUT_FILENO, buf, rd) );

		close(fd);
		return EXIT_FAILURE;
	}

dflt:
	if (fd >= 0)
		close(fd);
	fprintf(stdout, _("This account is currently not available.\n"));
	return EXIT_FAILURE;
}
Commit	Line	Data
88407b93 KZ	1	/*
	2	* Copyright (C) 2013 Karel Zak <kzak@redhat.com>
	3	*/
	4
	5	#include <stdio.h>
bd299782	6	#include <sys/stat.h>
88407b93 KZ	7	#include <sys/types.h>
	8	#include <fcntl.h>
	9	#include <string.h>
	10	#include <unistd.h>
	11	#include <stdlib.h>
	12	#include <getopt.h>
	13
	14	#include "c.h"
	15	#include "nls.h"
	16	#include "pathnames.h"
	17
	18	/*
	19	* Always return EXIT_FAILURE (1), don't try to be smart!
	20	*/
	21
86be6a32	22	static void __attribute__((__noreturn__)) usage(void)
88407b93	23	{
86be6a32	24	FILE *out = stdout;
88407b93	25	fputs(USAGE_HEADER, out);
88407b93 KZ	26	fprintf(out,
	27	_(" %s [options]\n"), program_invocation_short_name);
	28
451dbcfa BS	29	fputs(USAGE_SEPARATOR, out);
	30	fputs(_("Politely refuse a login.\n"), out);
	31
88407b93	32	fputs(USAGE_OPTIONS, out);
a174eefb SB	33	fputs(_(" -c, --command <command> does nothing (for compatibility with su -c)\n"), out);
a174eefb SB	34	printf(USAGE_HELP_OPTIONS(26));
88407b93	35
f45f3ec3	36	printf(USAGE_MAN_TAIL("nologin(8)"));
88407b93 KZ	37	exit(EXIT_FAILURE);
	38	}
	39
	40	int main(int argc, char *argv[])
	41	{
dd732fa2	42	int c, fd = -1;
bd299782	43	struct stat st;
beb61b07 SK	44	enum {
	45	OPT_INIT_FILE = CHAR_MAX + 1,
	46	OPT_NOPROFILE,
	47	OPT_NORC,
	48	OPT_POSIX,
	49	OPT_RCFILE
	50	};
88407b93	51	static const struct option longopts[] = {
beb61b07 SK	52	{ "command", required_argument, NULL, 'c' },
	53	{ "init-file", required_argument, NULL, OPT_INIT_FILE },
	54	{ "interactive", no_argument, NULL, 'i' },
	55	{ "login", no_argument, NULL, 'l' },
	56	{ "noprofile", no_argument, NULL, OPT_NOPROFILE },
	57	{ "norc", no_argument, NULL, OPT_NORC },
	58	{ "posix", no_argument, NULL, OPT_POSIX },
	59	{ "rcfile", required_argument, NULL, OPT_RCFILE },
	60	{ "restricted", no_argument, NULL, 'r' },
	61	{ "help", no_argument, NULL, 'h' },
	62	{ "version", no_argument, NULL, 'V' },
87918040	63	{ NULL, 0, NULL, 0 }
88407b93 KZ	64	};
	65
	66	setlocale(LC_ALL, "");
	67	bindtextdomain(PACKAGE, LOCALEDIR);
	68	textdomain(PACKAGE);
	69
beb61b07	70	while ((c = getopt_long(argc, argv, "c:ilrhV", longopts, NULL)) != -1) {
88407b93	71	switch (c) {
a174eefb	72	case 'c':
beb61b07 SK	73	case OPT_INIT_FILE:
	74	case 'i':
	75	case 'l':
	76	case OPT_NOPROFILE:
	77	case OPT_NORC:
	78	case OPT_POSIX:
	79	case OPT_RCFILE:
	80	case 'r':
	81	/* Ignore well known shell command-line options */
a174eefb	82	break;
88407b93	83	case 'h':
86be6a32	84	usage();
88407b93	85	case 'V':
2c308875	86	print_version(EXIT_FAILURE); /* yes FAILURE! */
88407b93	87	default:
677ec86c	88	errtryhelp(EXIT_FAILURE);
88407b93 KZ	89	}
	90	}
	91
	92	fd = open(_PATH_NOLOGIN_TXT, O_RDONLY);
dd732fa2 KZ	93	if (fd < 0)
	94	goto dflt;
	95
bd299782	96	c = fstat(fd, &st);
dd732fa2 KZ	97	if (c < 0 \|\| !S_ISREG(st.st_mode))
	98	goto dflt;
	99	else {
88407b93 KZ	100	char buf[BUFSIZ];
	101	ssize_t rd;
	102
	103	while ((rd = read(fd, buf, sizeof(buf))) > 0)
	104	ignore_result( write(STDOUT_FILENO, buf, rd) );
dd732fa2	105
88407b93	106	close(fd);
dd732fa2 KZ	107	return EXIT_FAILURE;
dd732fa2 KZ	108	}
88407b93	109
dd732fa2 KZ	110	dflt:
	111	if (fd >= 0)
	112	close(fd);
	113	fprintf(stdout, _("This account is currently not available.\n"));
88407b93 KZ	114	return EXIT_FAILURE;
88407b93 KZ	115	}