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 1.8 1999/10/26 04:27:14 davidn Exp $
  27  * $DragonFly: src/usr.sbin/pw/grupd.c,v 1.2 2003/06/17 04:30:01 dillon Exp $
  28  */
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34 #include <stdarg.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <sys/param.h>
  38
  39 #include "pwupd.h"
  40
  41 static char * grpath = _PATH_PWD;
  42
  43 int
  44 setgrdir(const char * dir)
  45 {
  46         if (dir == NULL)
  47                 return -1;
  48         else {
  49                 char * d = malloc(strlen(dir)+1);
  50                 if (d == NULL)
  51                         return -1;
  52                 grpath = strcpy(d, dir);
  53         }
  54         return 0;
  55 }
  56
  57 char *
  58 getgrpath(const char * file)
  59 {
  60         static char pathbuf[MAXPATHLEN];
  61
  62         snprintf(pathbuf, sizeof pathbuf, "%s/%s", grpath, file);
  63         return pathbuf;
  64 }
  65
  66 int
  67 grdb(char *arg,...)
  68 {
  69         /*
  70          * This is a stub for now, but maybe eventually be functional
  71          * if ever an indexed version of /etc/groups is implemented.
  72          */
  73         arg=arg;
  74         return 0;
  75 }
  76
  77 int
  78 fmtgrentry(char **buf, int * buflen, struct group * grp, int type)
  79 {
  80         int             i, l;
  81
  82         /*
  83          * Since a group line is of arbitrary length,
  84          * we need to calculate up-front just how long
  85          * it will need to be...
  86          */
  87         /*  groupname              :   password                 :  gid  : */
  88         l = strlen(grp->gr_name) + 1 + strlen(grp->gr_passwd) + 1 + 5 + 1;
  89         /* group members + comma separator */
  90         for (i = 0; grp->gr_mem[i] != NULL; i++) {
  91                 l += strlen(grp->gr_mem[i]) + 1;
  92         }
  93         l += 2; /* For newline & NUL */
  94         if (extendline(buf, buflen, l) == -1)
  95                 l = -1;
  96         else{
  97                 /*
  98                  * Now we can safely format
  99                  */
 100                 if (type == PWF_STANDARD)
 101                         l = sprintf(*buf, "%s:*:%ld:", grp->gr_name, (long) grp->gr_gid);
 102                 else
 103                         l = sprintf(*buf, "%s:%s:%ld:", grp->gr_name, grp->gr_passwd, (long) grp->gr_gid);
 104
 105                 /*
 106                  * List members
 107                  */
 108                 for (i = 0; grp->gr_mem[i] != NULL; i++) {
 109                         l += sprintf(*buf + l, "%s%s", i ? "," : "", grp->gr_mem[i]);
 110                 }
 111
 112                 (*buf)[l++] = '\n';
 113                 (*buf)[l] = '\0';
 114         }
 115         return l;
 116 }
 117
 118
 119 int
 120 fmtgrent(char **buf, int * buflen, struct group * grp)
 121 {
 122         return fmtgrentry(buf, buflen, grp, PWF_STANDARD);
 123 }
 124
 125
 126 static int
 127 gr_update(struct group * grp, char const * group, int mode)
 128 {
 129         int             l;
 130         char            pfx[64];
 131         int             grbuflen = 0;
 132         char           *grbuf = NULL;
 133
 134         ENDGRENT();
 135         l = snprintf(pfx, sizeof pfx, "%s:", group);
 136
 137         /*
 138          * Update the group file
 139          */
 140         if (grp != NULL && fmtgrentry(&grbuf, &grbuflen, grp, PWF_PASSWD) == -1)
 141                 l = -1;
 142         else {
 143                 l = fileupdate(getgrpath(_GROUP), 0644, grbuf, pfx, l, mode);
 144                 if (l == 0)
 145                         l = grdb(NULL);
 146         }
 147         if (grbuf != NULL)
 148                 free(grbuf);
 149         return l;
 150 }
 151
 152
 153 int
 154 addgrent(struct group * grp)
 155 {
 156         return gr_update(grp, grp->gr_name, UPD_CREATE);
 157 }
 158
 159 int
 160 chggrent(char const * login, struct group * grp)
 161 {
 162         return gr_update(grp, login, UPD_REPLACE);
 163 }
 164
 165 int
 166 delgrent(struct group * grp)
 167 {
 168         return gr_update(NULL, grp->gr_name, UPD_DELETE);
 169 }