usr.sbin/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  * $FreeBSD: src/usr.sbin/pw/grupd.c,v 1.10 2001/08/30 06:32:17 dd 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 <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <sys/param.h>
  37
  38 #include "pwupd.h"
  39
  40 static char * grpath = _PATH_PWD;
  41
  42 int
  43 setgrdir(const char * dir)
  44 {
  45         if (dir == NULL)
  46                 return -1;
  47         else {
  48                 char * d = malloc(strlen(dir)+1);
  49                 if (d == NULL)
  50                         return -1;
  51                 grpath = strcpy(d, dir);
  52         }
  53         return 0;
  54 }
  55
  56 char *
  57 getgrpath(const char * file)
  58 {
  59         static char pathbuf[MAXPATHLEN];
  60
  61         snprintf(pathbuf, sizeof pathbuf, "%s/%s", grpath, file);
  62         return pathbuf;
  63 }
  64
  65 int
  66 grdb(char *arg,...)
  67 {
  68         /*
  69          * This is a stub for now, but maybe eventually be functional
  70          * if ever an indexed version of /etc/groups is implemented.
  71          */
  72         arg=arg;
  73         return 0;
  74 }
  75
  76 int
  77 fmtgrentry(char **buf, int * buflen, struct group * grp, int type)
  78 {
  79         int             i, l;
  80
  81         /*
  82          * Since a group line is of arbitrary length,
  83          * we need to calculate up-front just how long
  84          * it will need to be...
  85          */
  86         /*  groupname              :   password                 :  gid  : */
  87         l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1;
  88         /* group members + comma separator */
  89         for (i = 0; grp->gr_mem[i] != NULL; i++) {
  90                 l += strlen(grp->gr_mem[i]) + 1;
  91         }
  92         l += 2; /* For newline & NUL */
  93         if (extendline(buf, buflen, l) == -1)
  94                 l = -1;
  95         else{
  96                 /*
  97                  * Now we can safely format
  98                  */
  99                 if (type == PWF_STANDARD)
 100                         l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid);
 101                 else
 102                         l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);
 103
 104                 /*
 105                  * List members
 106                  */
 107                 for (i = 0; grp->gr_mem[i] != NULL; i++) {
 108                         l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]);
 109                 }
 110
 111                 (*buf)[l++] = '\n';
 112                 (*buf)[l] = '\0';
 113         }
 114         return l;
 115 }
 116
 117
 118 int
 119 fmtgrent(char **buf, int * buflen, struct group * grp)
 120 {
 121         return fmtgrentry(buf, buflen, grp, PWF_STANDARD);
 122 }
 123
 124
 125 static int
 126 gr_update(struct group * grp, char const * group, int mode)
 127 {
 128         int             l;
 129         char            pfx[64];
 130         int             grbuflen = 0;
 131         char           *grbuf = NULL;
 132
 133         ENDGRENT();
 134         l = snprintf(pfx, sizeof pfx, "%s:", group);
 135
 136         /*
 137          * Update the group file
 138          */
 139         if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1)
 140                 l = -1;
 141         else {
 142                 l = fileupdate(getgrpath(_GROUP), 0644, grbuf, pfx, l, mode);
 143                 if (l == 0)
 144                         l = grdb(NULL);
 145         }
 146         if (grbuf != NULL)
 147                 free(grbuf);
 148         return l;
 149 }
 150
 151
 152 int
 153 addgrent(struct group * grp)
 154 {
 155         return gr_update(grp, grp->gr_name, UPD_CREATE);
 156 }
 157
 158 int
 159 chggrent(char const * login, struct group * grp)
 160 {
 161         return gr_update(grp, login, UPD_REPLACE);
 162 }
 163
 164 int
 165 delgrent(struct group * grp)
 166 {
 167         return gr_update(NULL, grp->gr_name, UPD_DELETE);
 168 }