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      1 /*	$NetBSD: vipw.c,v 1.16 2011/08/31 16:25:00 plunky Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1987, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\
     35  The Regents of the University of California.  All rights reserved.");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)vipw.c	8.3 (Berkeley) 4/2/94";
     41 #else
     42 __RCSID("$NetBSD: vipw.c,v 1.16 2011/08/31 16:25:00 plunky Exp $");
     43 #endif
     44 #endif /* not lint */
     45 
     46 #include <sys/types.h>
     47 #include <sys/param.h>
     48 #include <sys/stat.h>
     49 
     50 #include <err.h>
     51 #include <pwd.h>
     52 #include <stdio.h>
     53 #include <stdlib.h>
     54 #include <string.h>
     55 #include <unistd.h>
     56 #include <fcntl.h>
     57 #include <errno.h>
     58 #include <util.h>
     59 
     60 static void	copyfile(int, int);
     61 __dead static void	usage(void);
     62 
     63 static char mpwd[MAXPATHLEN], mpwdl[MAXPATHLEN];
     64 
     65 int
     66 main(int argc, char *argv[])
     67 {
     68 	const char *prefix;
     69 	int pfd, tfd;
     70 	struct stat begin, end;
     71 	int ch;
     72 
     73 	prefix = "";
     74 	while ((ch = getopt(argc, argv, "d:")) != -1) {
     75 		switch (ch) {
     76 		case 'd':
     77 			prefix = optarg;
     78 			if (pw_setprefix(prefix) < 0)
     79 				err(1, "%s", prefix);
     80 			break;
     81 		case '?':
     82 		default:
     83 			usage();
     84 		}
     85 	}
     86 	argc -= optind;
     87 	argv += optind;
     88 
     89 	if (argc != 0)
     90 		usage();
     91 
     92 	(void)snprintf(mpwd, sizeof(mpwd), "%s%s", prefix, _PATH_MASTERPASSWD);
     93 	(void)snprintf(mpwdl, sizeof(mpwdl), "%s%s", prefix,
     94 		_PATH_MASTERPASSWD_LOCK);
     95 
     96 	pw_init();
     97 	tfd = pw_lock(0);
     98 	if (tfd < 0) {
     99 		if (errno == EEXIST)
    100 			errx(1, "the passwd file is busy.");
    101 		else
    102 			err(1, "%s", mpwdl);
    103 	}
    104 
    105 	pfd = open(mpwd, O_RDONLY, 0);
    106 	if (pfd < 0)
    107 		pw_error(mpwd, 1, 1);
    108 	copyfile(pfd, tfd);
    109 	(void)close(tfd);
    110 
    111 	for (;;) {
    112 		if (stat(mpwdl, &begin))
    113 			pw_error(mpwdl, 1, 1);
    114 		pw_edit(0, NULL);
    115 		if (stat(mpwdl, &end))
    116 			pw_error(mpwdl, 1, 1);
    117 		if (begin.st_mtime == end.st_mtime &&
    118 		    begin.st_mtimensec == end.st_mtimensec) {
    119 			warnx("no changes made");
    120 			pw_error(NULL, 0, 0);
    121 		}
    122 		if (pw_mkdb(NULL, 0) == 0)
    123 			break;
    124 		pw_prompt();
    125 	}
    126 	return 0;
    127 }
    128 
    129 static void
    130 copyfile(int from, int to)
    131 {
    132 	int nr, nw, off;
    133 	char buf[8*1024];
    134 
    135 	while ((nr = read(from, buf, sizeof(buf))) > 0)
    136 		for (off = 0; off < nr; nr -= nw, off += nw)
    137 			if ((nw = write(to, buf + off, nr)) < 0)
    138 				pw_error(mpwdl, 1, 1);
    139 	if (nr < 0)
    140 		pw_error(mpwd, 1, 1);
    141 }
    142 
    143 static void
    144 usage(void)
    145 {
    146 
    147 	(void)fprintf(stderr, "usage: %s [-d directory]\n", getprogname());
    148 	exit(1);
    149 }
    150