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  *      $Id: grupd.c,v 1.1.1.2 1996/12/10 23:58:56 joerg Exp $
  27  */
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <stdarg.h>
  34 #include <errno.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37
  38 #include "pwupd.h"
  39
  40 int
  41 fmtgrentry(char **buf, int * buflen, struct group * grp, int type)
  42 {
  43         int             i, l;
  44
  45         /*
  46          * Since a group line is of arbitrary length,
  47          * we need to calculate up-front just how long
  48          * it will need to be...
  49          */
  50         /*  groupname              :   password                 :  gid  : */
  51         l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1;
  52         /* group members + comma separator */
  53         for (i = 0; grp->gr_mem[i] != NULL; i++) {
  54                 l += strlen(grp->gr_mem[i]) + 1;
  55         }
  56         l += 2; /* For newline & NUL */
  57         if (extendline(buf, buflen, l) == -1)
  58                 l = -1;
  59         else{
  60                 /*
  61                  * Now we can safely format
  62                  */
  63                 if (type == PWF_STANDARD)
  64                         l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid);
  65                 else
  66                         l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);
  67
  68                 /*
  69                  * List members
  70                  */
  71                 for (i = 0; grp->gr_mem[i] != NULL; i++) {
  72                         l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]);
  73                 }
  74
  75                 (*buf)[l++] = '\n';
  76                 (*buf)[l] = '\0';
  77         }
  78         return l;
  79 }
  80
  81
  82 int
  83 fmtgrent(char **buf, int * buflen, struct group * grp)
  84 {
  85         return fmtgrentry(buf, buflen, grp, PWF_STANDARD);
  86 }
  87
  88
  89 static int
  90 gr_update(struct group * grp, char const * group, int mode)
  91 {
  92         int             l;
  93         char            pfx[64];
  94         int             grbuflen = 0;
  95         char           *grbuf = NULL;
  96
  97         endgrent();
  98         l = snprintf(pfx, sizeof pfx, "%s:", group);
  99
 100         /*
 101          * Update the group file
 102          */
 103         if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1)
 104                 l = -1;
 105         else
 106                 l = fileupdate(_PATH_GROUP, 0644, grbuf, pfx, l, mode);
 107         if (grbuf != NULL)
 108                 free(grbuf);
 109         return l;
 110 }
 111
 112
 113 int
 114 addgrent(struct group * grp)
 115 {
 116         return gr_update(grp, grp->gr_name, UPD_CREATE);
 117 }
 118
 119 int
 120 chggrent(char const * login, struct group * grp)
 121 {
 122         return gr_update(grp, login, UPD_REPLACE);
 123 }
 124
 125 int
 126 delgrent(struct group * grp)
 127 {
 128         return gr_update(NULL, grp->gr_name, UPD_DELETE);
 129 }