usr.sbin/vipw/vipw.c

   1 /*      $NetBSD: vipw.c,v 1.13 2008/07/21 13:37:00 lukem 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 1.13 2008/07/21 13:37:00 lukem 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 int     main __P((int, char **));
  61 static void     copyfile __P((int, int));
  62 static void     usage __P((void));
  63
  64 char mpwd[MAXPATHLEN], mpwdl[MAXPATHLEN];
  65
  66 int
  67 main(int argc, char *argv[])
  68 {
  69         const char *prefix;
  70         int pfd, tfd;
  71         struct stat begin, end;
  72         int ch;
  73
  74         prefix = "";
  75         while ((ch = getopt(argc, argv, "d:")) != -1) {
  76                 switch (ch) {
  77                 case 'd':
  78                         prefix = optarg;
  79                         if (pw_setprefix(prefix) < 0)
  80                                 err(1, "%s", prefix);
  81                         break;
  82                 case '?':
  83                 default:
  84                         usage();
  85                 }
  86         }
  87         argc -= optind;
  88         argv += optind;
  89
  90         if (argc != 0)
  91                 usage();
  92
  93         (void)snprintf(mpwd, sizeof(mpwd), "%s%s", prefix, _PATH_MASTERPASSWD);
  94         (void)snprintf(mpwdl, sizeof(mpwdl), "%s%s", prefix,
  95                 _PATH_MASTERPASSWD_LOCK);
  96
  97         pw_init();
  98         tfd = pw_lock(0);
  99         if (tfd < 0) {
 100                 if (errno == EEXIST)
 101                         errx(1, "the passwd file is busy.");
 102                 else
 103                         err(1, "%s", mpwdl);
 104         }
 105
 106         pfd = open(mpwd, O_RDONLY, 0);
 107         if (pfd < 0)
 108                 pw_error(mpwd, 1, 1);
 109         copyfile(pfd, tfd);
 110         (void)close(tfd);
 111
 112         for (;;) {
 113                 if (stat(mpwdl, &begin))
 114                         pw_error(mpwdl, 1, 1);
 115                 pw_edit(0, NULL);
 116                 if (stat(mpwdl, &end))
 117                         pw_error(mpwdl, 1, 1);
 118                 if (begin.st_mtime == end.st_mtime &&
 119                     begin.st_mtimensec == end.st_mtimensec) {
 120                         warnx("no changes made");
 121                         pw_error((char *)NULL, 0, 0);
 122                 }
 123                 if (pw_mkdb(NULL, 0) == 0)
 124                         break;
 125                 pw_prompt();
 126         }
 127         return 0;
 128 }
 129
 130 static void
 131 copyfile(int from, int to)
 132 {
 133         int nr, nw, off;
 134         char buf[8*1024];
 135
 136         while ((nr = read(from, buf, sizeof(buf))) > 0)
 137                 for (off = 0; off < nr; nr -= nw, off += nw)
 138                         if ((nw = write(to, buf + off, nr)) < 0)
 139                                 pw_error(mpwdl, 1, 1);
 140         if (nr < 0)
 141                 pw_error(mpwd, 1, 1);
 142 }
 143
 144 static void
 145 usage(void)
 146 {
 147
 148         (void)fprintf(stderr, "usage: %s [-d directory]\n", getprogname());
 149         exit(1);
 150 }