mdw@git.distorted.org.uk Git - checkpath/blob - utils.c

   1 /* -*-c-*-
   2  *
   3  * Utilities not worth librarifying
   4  *
   5  * (c) 2008 Mark Wooding
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of chkpath.
  11  *
  12  * chkpath is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * chkpath is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with chkpath; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include "config.h"
  30
  31 #include <ctype.h>
  32 #include <stdlib.h>
  33
  34 #include <sys/types.h>
  35
  36 #include <grp.h>
  37
  38 #include <mLib/macros.h>
  39 #include <mLib/report.h>
  40
  41 #include "checkpath.h"
  42 #include "utils.h"
  43
  44 /*----- Main code ---------------------------------------------------------*/
  45
  46 /* --- @allowgroup@ --- *
  47  *
  48  * Arguments:   @struct checkpath *cp@ = pointer to structure to mess with
  49  *              @const char *gname@ = trust group @gname@
  50  *
  51  * Returns:     ---
  52  *
  53  * Use:         Adds the gid corresponding to @gname@ (which may be a number)
  54  *              to the list of things we trust.
  55  */
  56
  57 void allowgroup(struct checkpath *cp, const char *gname)
  58 {
  59   struct group *gr;
  60   const char *p;
  61   gid_t g;
  62
  63   /* --- Check for numeric group spec --- */
  64
  65   for (p = gname; *p; p++) {
  66     if (!isdigit((unsigned char)*p))
  67       goto lookup;
  68   }
  69   g = atoi(gname);
  70   goto insert;
  71
  72   /* --- Look up a group by name --- */
  73
  74 lookup:
  75   if ((gr = getgrnam(gname)) == 0)
  76     die(1, "group %s not found", gname);
  77   g = gr->gr_gid;
  78
  79   /* --- Insert the group into the table --- */
  80
  81 insert:
  82   if (cp->cp_gids >= N(cp->cp_gid))
  83     die(1, "too many groups");
  84   cp->cp_gid[cp->cp_gids++] = g;
  85 }
  86
  87 /*----- That's all, folks -------------------------------------------------*/