pw/grupd.c

   1 /*-
   2  * Copyright (C) 1996
   3  *      David L. Nugent.  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  *
  14  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #ifndef lint
  28 static const char rcsid[] =
  29         "$Id$";
  30 #endif /* not lint */
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36 #include <stdarg.h>
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39
  40 #include "pwupd.h"
  41
  42 int
  43 fmtgrentry(char **buf, int * buflen, struct group * grp, int type)
  44 {
  45         int             i, l;
  46
  47         /*
  48          * Since a group line is of arbitrary length,
  49          * we need to calculate up-front just how long
  50          * it will need to be...
  51          */
  52         /*  groupname              :   password                 :  gid  : */
  53         l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1;
  54         /* group members + comma separator */
  55         for (i = 0; grp->gr_mem[i] != NULL; i++) {
  56                 l += strlen(grp->gr_mem[i]) + 1;
  57         }
  58         l += 2; /* For newline & NUL */
  59         if (extendline(buf, buflen, l) == -1)
  60                 l = -1;
  61         else{
  62                 /*
  63                  * Now we can safely format
  64                  */
  65                 if (type == PWF_STANDARD)
  66                         l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid);
  67                 else
  68                         l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);
  69
  70                 /*
  71                  * List members
  72                  */
  73                 for (i = 0; grp->gr_mem[i] != NULL; i++) {
  74                         l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]);
  75                 }
  76
  77                 (*buf)[l++] = '\n';
  78                 (*buf)[l] = '\0';
  79         }
  80         return l;
  81 }
  82
  83
  84 int
  85 fmtgrent(char **buf, int * buflen, struct group * grp)
  86 {
  87         return fmtgrentry(buf, buflen, grp, PWF_STANDARD);
  88 }
  89
  90
  91 static int
  92 gr_update(struct group * grp, char const * group, int mode)
  93 {
  94         int             l;
  95         char            pfx[64];
  96         int             grbuflen = 0;
  97         char           *grbuf = NULL;
  98
  99         endgrent();
 100         l = snprintf(pfx, sizeof pfx, "%s:", group);
 101
 102         /*
 103          * Update the group file
 104          */
 105         if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1)
 106                 l = -1;
 107         else
 108                 l = fileupdate(_PATH_GROUP, 0644, grbuf, pfx, l, mode);
 109         if (grbuf != NULL)
 110                 free(grbuf);
 111         return l;
 112 }
 113
 114
 115 int
 116 addgrent(struct group * grp)
 117 {
 118         return gr_update(grp, grp->gr_name, UPD_CREATE);
 119 }
 120
 121 int
 122 chggrent(char const * login, struct group * grp)
 123 {
 124         return gr_update(grp, login, UPD_REPLACE);
 125 }
 126
 127 int
 128 delgrent(struct group * grp)
 129 {
 130         return gr_update(NULL, grp->gr_name, UPD_DELETE);
 131 }