/* getugroups.c -- return a list of the groups a user is in
- Copyright (C) 1990, 1991, 1998 Free Software Foundation.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1990-1991, 1998-2000, 2003-2011 Free Software Foundation, Inc.
+
+ This program 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, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by David MacKenzie. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
+
+#include "getugroups.h"
-#include <sys/types.h>
+#include <errno.h>
+#include <limits.h>
#include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */
-#include <grp.h>
+#include <string.h>
+#include <unistd.h>
-#ifdef HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#if !HAVE_GRP_H
-/* setgrent, getgrent, and endgrent are not specified by POSIX.1,
- so header files might not declare them.
- If you don't have them at all, we can't implement this function.
- You lose! */
-struct group *getgrent ();
+/* Mingw lacks all things related to group management. The best we
+ can do is fail with ENOSYS. */
-#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
-# include <string.h>
-#else
-# include <strings.h>
-#endif
+int
+getugroups (int maxcount _GL_UNUSED,
+ gid_t *grouplist _GL_UNUSED,
+ char const *username _GL_UNUSED,
+ gid_t gid _GL_UNUSED)
+{
+ errno = ENOSYS;
+ return -1;
+}
-/* Like `getgroups', but for user USERNAME instead of for
- the current process. */
+#else /* HAVE_GRP_H */
+# include <grp.h>
+
+# define STREQ(a, b) (strcmp (a, b) == 0)
+
+/* Like `getgroups', but for user USERNAME instead of for the current
+ process. Store at most MAXCOUNT group IDs in the GROUPLIST array.
+ If GID is not -1, store it first (if possible). GID should be the
+ group ID (pw_gid) obtained from getpwuid, in case USERNAME is not
+ listed in /etc/groups. Upon failure, set errno and return -1.
+ Otherwise, return the number of IDs we've written into GROUPLIST. */
int
-getugroups (maxcount, grouplist, username)
- int maxcount;
- GETGROUPS_T *grouplist;
- char *username;
+getugroups (int maxcount, gid_t *grouplist, char const *username,
+ gid_t gid)
{
- struct group *grp;
- register char **cp;
- register int count = 0;
+ int count = 0;
+
+ if (gid != (gid_t) -1)
+ {
+ if (maxcount != 0)
+ grouplist[count] = gid;
+ ++count;
+ }
setgrent ();
- while ((grp = getgrent ()) != 0)
- for (cp = grp->gr_mem; *cp; ++cp)
- if (!strcmp (username, *cp))
- {
- int n;
-
- /* See if this group number is already on the list. */
- for (n = 0; n < count; ++n)
- if (grouplist[n] == grp->gr_gid)
- break;
-
- /* If it's a new group number, then try to add it to the list. */
- if (n == count)
- {
- if (maxcount != 0)
- {
- if (count >= maxcount)
- {
- endgrent ();
- return count;
- }
- grouplist[count] = grp->gr_gid;
- }
- count++;
- }
- }
- endgrent ();
+ while (1)
+ {
+ char **cp;
+ struct group *grp;
+
+ errno = 0;
+ grp = getgrent ();
+ if (grp == NULL)
+ break;
+
+ for (cp = grp->gr_mem; *cp; ++cp)
+ {
+ int n;
+
+ if ( ! STREQ (username, *cp))
+ continue;
+
+ /* See if this group number is already on the list. */
+ for (n = 0; n < count; ++n)
+ if (grouplist && grouplist[n] == grp->gr_gid)
+ break;
+
+ /* If it's a new group number, then try to add it to the list. */
+ if (n == count)
+ {
+ if (maxcount != 0)
+ {
+ if (count >= maxcount)
+ goto done;
+ grouplist[count] = grp->gr_gid;
+ }
+ if (count == INT_MAX)
+ {
+ errno = EOVERFLOW;
+ goto done;
+ }
+ count++;
+ }
+ }
+ }
+
+ if (errno != 0)
+ count = -1;
+
+ done:
+ {
+ int saved_errno = errno;
+ endgrent ();
+ errno = saved_errno;
+ }
+
return count;
}
+
+#endif /* HAVE_GRP_H */