chpass/pw_copy.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char sccsid[] = "@(#)pw_copy.c     8.4 (Berkeley) 4/2/94";
  36 #endif /* not lint */
  37
  38 /*
  39  * This module is used to copy the master password file, replacing a single
  40  * record, by chpass(1) and passwd(1).
  41  */
  42
  43 #include <err.h>
  44 #include <pwd.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48
  49 #include <pw_util.h>
  50 #include "pw_copy.h"
  51
  52 extern char *tempname;
  53
  54 void
  55 pw_copy(ffd, tfd, pw)
  56         int ffd, tfd;
  57         struct passwd *pw;
  58 {
  59         FILE *from, *to;
  60         int done;
  61         char *p, buf[8192];
  62         char uidstr[20];
  63         char gidstr[20];
  64         char chgstr[20];
  65         char expstr[20];
  66
  67         snprintf(uidstr, sizeof(uidstr), "%d", pw->pw_uid);
  68         snprintf(gidstr, sizeof(gidstr), "%d", pw->pw_gid);
  69         snprintf(chgstr, sizeof(chgstr), "%ld", pw->pw_change);
  70         snprintf(expstr, sizeof(expstr), "%ld", pw->pw_expire);
  71
  72         if (!(from = fdopen(ffd, "r")))
  73                 pw_error(_PATH_MASTERPASSWD, 1, 1);
  74         if (!(to = fdopen(tfd, "w")))
  75                 pw_error(tempname, 1, 1);
  76
  77         for (done = 0; fgets(buf, sizeof(buf), from);) {
  78                 if (!strchr(buf, '\n')) {
  79                         warnx("%s: line too long", _PATH_MASTERPASSWD);
  80                         pw_error(NULL, 0, 1);
  81                 }
  82                 if (done) {
  83                         (void)fprintf(to, "%s", buf);
  84                         if (ferror(to))
  85                                 goto err;
  86                         continue;
  87                 }
  88                 if (!(p = strchr(buf, ':'))) {
  89                         warnx("%s: corrupted entry", _PATH_MASTERPASSWD);
  90                         pw_error(NULL, 0, 1);
  91                 }
  92                 *p = '\0';
  93                 if (strcmp(buf, pw->pw_name)) {
  94                         *p = ':';
  95                         (void)fprintf(to, "%s", buf);
  96                         if (ferror(to))
  97                                 goto err;
  98                         continue;
  99                 }
 100                 (void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
 101                     pw->pw_name, pw->pw_passwd,
 102                     pw->pw_fields & _PWF_UID ? uidstr : "",
 103                     pw->pw_fields & _PWF_GID ? gidstr : "",
 104                     pw->pw_class,
 105                     pw->pw_fields & _PWF_CHANGE ? chgstr : "",
 106                     pw->pw_fields & _PWF_EXPIRE ? expstr : "",
 107                     pw->pw_gecos, pw->pw_dir, pw->pw_shell);
 108                 done = 1;
 109                 if (ferror(to))
 110                         goto err;
 111         }
 112         if (!done)
 113 #ifdef YP
 114         /* Ultra paranoid: shouldn't happen. */
 115                 if (getuid())  {
 116                         warnx("%s: not found in %s -- permission denied",
 117                                         pw->pw_name, _PATH_MASTERPASSWD);
 118                         pw_error(NULL, 0, 1);
 119                 } else
 120 #endif /* YP */
 121                 (void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
 122                     pw->pw_name, pw->pw_passwd,
 123                     pw->pw_fields & _PWF_UID ? uidstr : "",
 124                     pw->pw_fields & _PWF_GID ? gidstr : "",
 125                     pw->pw_class,
 126                     pw->pw_fields & _PWF_CHANGE ? chgstr : "",
 127                     pw->pw_fields & _PWF_EXPIRE ? expstr : "",
 128                     pw->pw_gecos, pw->pw_dir, pw->pw_shell);
 129
 130         if (ferror(to))
 131 err:            pw_error(NULL, 1, 1);
 132         (void)fclose(to);
 133 }