usr.sbin/vipw/vipw.c

   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 }