diff options
Diffstat (limited to 'lib/getugroups.c')
| -rw-r--r-- | lib/getugroups.c | 146 |
1 files changed, 85 insertions, 61 deletions
diff --git a/lib/getugroups.c b/lib/getugroups.c index 970192e..96b84cb 100644 --- a/lib/getugroups.c +++ b/lib/getugroups.c @@ -1,12 +1,11 @@ /* getugroups.c -- return a list of the groups a user is in - Copyright (C) 1990, 1991, 1998, 1999, 2000, 2003, 2004, 2005, 2006 - Free Software Foundation. + Copyright (C) 1990-1991, 1998-2000, 2003-2016 Free Software Foundation, Inc. - This program is free software; you can redistribute it and/or modify + 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 @@ -14,91 +13,116 @@ 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* Written by David MacKenzie. */ #include <config.h> -#include <sys/types.h> -#include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */ -#include <grp.h> +#include "getugroups.h" +#include <errno.h> +#include <limits.h> +#include <stdio.h> /* grp.h on alpha OSF1 V2.0 uses "FILE *". */ +#include <string.h> #include <unistd.h> -#include <errno.h> -#ifndef EOVERFLOW -# define EOVERFLOW EINVAL -#endif +#if !HAVE_GRP_H || defined __ANDROID__ -/* Some old header files might not declare setgrent, getgrent, and endgrent. - 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. -#include <string.h> + Bionic declares e.g. getgrent() in <grp.h> but it isn't actually + defined in the library. */ + +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; +} -#define STREQ(s1, s2) ((strcmp (s1, s2) == 0)) +#else /* HAVE_GRP_H */ +# include <grp.h> -/* Like `getgroups', but for user USERNAME instead of for the current +# 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. - Always return the number of groups of which USERNAME is a member. */ + listed in /etc/groups. Upon failure, set errno and return -1. + Otherwise, return the number of IDs we've written into GROUPLIST. */ int -getugroups (int maxcount, GETGROUPS_T *grouplist, char *username, gid_t gid) +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; + grouplist[count] = gid; ++count; } setgrent (); - while ((grp = getgrent ()) != 0) + 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) - { - endgrent (); - return count; - } - grouplist[count] = grp->gr_gid; - } - count++; - if (count < 0) - { - errno = EOVERFLOW; - return -1; - } - } - } + { + 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++; + } + } } - endgrent (); + + if (errno != 0) + count = -1; + + done: + { + int saved_errno = errno; + endgrent (); + errno = saved_errno; + } return count; } + +#endif /* HAVE_GRP_H */ |