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   "$FreeBSD$";
  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 #include <sys/param.h>
  40
  41 #include "pwupd.h"
  42
  43 static char * grpath = _PATH_PWD;
  44
  45 int
  46 setgrdir(const char * dir)
  47 {
  48         if (dir == NULL)
  49                 return -1;
  50         else {
  51                 char * d = malloc(strlen(dir)+1);
  52                 if (d == NULL)
  53                         return -1;
  54                 grpath = strcpy(d, dir);
  55         }
  56         return 0;
  57 }
  58
  59 char *
  60 getgrpath(const char * file)
  61 {
  62         static char pathbuf[MAXPATHLEN];
  63
  64         snprintf(pathbuf, sizeof pathbuf, "%s/%s", grpath, file);
  65         return pathbuf;
  66 }
  67
  68 int
  69 grdb(char *arg,...)
  70 {
  71         /*
  72          * This is a stub for now, but maybe eventually be functional
  73          * if ever an indexed version of /etc/groups is implemented.
  74          */
  75         arg=arg;
  76         return 0;
  77 }
  78
  79 int
  80 fmtgrentry(char **buf, int * buflen, struct group * grp, int type)
  81 {
  82         int             i, l;
  83
  84         /*
  85          * Since a group line is of arbitrary length,
  86          * we need to calculate up-front just how long
  87          * it will need to be...
  88          */
  89         /*  groupname              :   password                 :  gid  : */
  90         l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1;
  91         /* group members + comma separator */
  92         for (i = 0; grp->gr_mem[i] != NULL; i++) {
  93                 l += strlen(grp->gr_mem[i]) + 1;
  94         }
  95         l += 2; /* For newline & NUL */
  96         if (extendline(buf, buflen, l) == -1)
  97                 l = -1;
  98         else{
  99                 /*
 100                  * Now we can safely format
 101                  */
 102                 if (type == PWF_STANDARD)
 103                         l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid);
 104                 else
 105                         l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);
 106
 107                 /*
 108                  * List members
 109                  */
 110                 for (i = 0; grp->gr_mem[i] != NULL; i++) {
 111                         l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]);
 112                 }
 113
 114                 (*buf)[l++] = '\n';
 115                 (*buf)[l] = '\0';
 116         }
 117         return l;
 118 }
 119
 120
 121 int
 122 fmtgrent(char **buf, int * buflen, struct group * grp)
 123 {
 124         return fmtgrentry(buf, buflen, grp, PWF_STANDARD);
 125 }
 126
 127
 128 static int
 129 gr_update(struct group * grp, char const * group, int mode)
 130 {
 131         int             l;
 132         char            pfx[64];
 133         int             grbuflen = 0;
 134         char           *grbuf = NULL;
 135
 136         ENDGRENT();
 137         l = snprintf(pfx, sizeof pfx, "%s:", group);
 138
 139         /*
 140          * Update the group file
 141          */
 142         if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1)
 143                 l = -1;
 144         else {
 145                 l = fileupdate(getgrpath(_GROUP), 0644, grbuf, pfx, l, mode);
 146                 if (l == 0)
 147                         l = grdb(NULL);
 148         }
 149         if (grbuf != NULL)
 150                 free(grbuf);
 151         return l;
 152 }
 153
 154
 155 int
 156 addgrent(struct group * grp)
 157 {
 158         return gr_update(grp, grp->gr_name, UPD_CREATE);
 159 }
 160
 161 int
 162 chggrent(char const * login, struct group * grp)
 163 {
 164         return gr_update(grp, login, UPD_REPLACE);
 165 }
 166
 167 int
 168 delgrent(struct group * grp)
 169 {
 170         return gr_update(NULL, grp->gr_name, UPD_DELETE);
 171 }