Release 1.2.3.

[checkpath] / utils.c

/* -*-c-*-
 *
 * Utilities not worth librarifying
 *
 * (c) 2008 Mark Wooding
 */

/*----- Licensing notice --------------------------------------------------*
 *
 * This file is part of chkpath.
 *
 * chkpath is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * chkpath is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with chkpath; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

#include "config.h"

#include <ctype.h>
#include <stdlib.h>

#include <sys/types.h>

#include <grp.h>

#include <mLib/macros.h>
#include <mLib/report.h>

#include "checkpath.h"
#include "utils.h"

/*----- Main code ---------------------------------------------------------*/

/* --- @allowgroup@ --- *
 *
 * Arguments:	@struct checkpath *cp@ = pointer to structure to mess with
 *		@const char *gname@ = trust group @gname@
 *
 * Returns:	---
 *
 * Use:		Adds the gid corresponding to @gname@ (which may be a number)
 *		to the list of things we trust.
 */

void allowgroup(struct checkpath *cp, const char *gname)
{
  struct group *gr;
  const char *p;
  gid_t g;

  /* --- Check for numeric group spec --- */

  for (p = gname; *p; p++) {
    if (!isdigit((unsigned char)*p))
      goto lookup;
  }
  g = atoi(gname);
  goto insert;

  /* --- Look up a group by name --- */

lookup:
  if ((gr = getgrnam(gname)) == 0)
    die(1, "group %s not found", gname);
  g = gr->gr_gid;

  /* --- Insert the group into the table --- */

insert:
  if (cp->cp_gids >= N(cp->cp_gid))
    die(1, "too many groups");
  cp->cp_gid[cp->cp_gids++] = g;
}

/*----- That's all, folks -------------------------------------------------*/