From 60ce5e1e96837e07170f0ea80393af60f1e7e395 Mon Sep 17 00:00:00 2001 From: Miles Bader Date: Tue, 27 May 1997 01:49:49 +0000 Subject: Initial checkin --- libshouldbeinlibc/idvec-impgids.c | 119 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 119 insertions(+) create mode 100644 libshouldbeinlibc/idvec-impgids.c (limited to 'libshouldbeinlibc/idvec-impgids.c') diff --git a/libshouldbeinlibc/idvec-impgids.c b/libshouldbeinlibc/idvec-impgids.c new file mode 100644 index 00000000..97c849a2 --- /dev/null +++ b/libshouldbeinlibc/idvec-impgids.c @@ -0,0 +1,119 @@ +/* Add gids implied by a user + + Copyright (C) 1997 Free Software Foundation, Inc. + + Written by Miles Bader + + 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. + + This program 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 this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include +#include +#include +#include +#include + +#define NUM_STATIC_GIDS 100 /* Initial size of static gid array. */ + +/* The set of gids implied by a uid. */ +struct uid_implies +{ + uid_t uid; /* this uid... */ + struct idvec *implies; /* implies these gids. */ + struct uid_implies *next; +}; + +/* Cache of previously calculated results for add_implied_gids. */ +static struct uid_implies *uid_implies_cache = 0; + +/* Add to IMPLIED_GIDS those group ids implied by the user UID. */ +static error_t +_merge_implied_gids (struct idvec *implied_gids, uid_t uid) +{ + struct uid_implies *ui; + + for (ui = uid_implies_cache; ui; ui = ui->next) + if (ui->uid == uid) + return idvec_merge (implied_gids, ui->implies); + + { + error_t err = 0; + struct passwd *pw = getpwuid (uid); + + if (! pw) + err = EINVAL; + else + { + struct idvec *cache = make_idvec (); +#if 0 /* Glibc doesn't have getgrouplist yet. */ + gid_t _gids[NUM_STATIC_GIDS], *gids = _gids; + size_t maxgids = NUM_STATIC_GIDS; + size_t ngids = + getgrouplist (pw->pw_name, pw->pw_gid, gids, &maxgids); + + if (ngids == -1) + { + gids = malloc (maxgids * sizeof (gid_t)); + if (! gids) + err = ENOMEM; + else + ngids = getgrouplist (pw->pw_name, pw->pw_gid, gids, &maxgids); + } + + if (! cache) + err = ENOMEM; + + if (! err) + { + err = idvec_merge_ids (cache, gids, ngids); + if (gids != _gids) + free (gids); + } +#else + if (! cache) + err = ENOMEM; + else + err = idvec_add_new (cache, pw->pw_gid); +#endif + + if (! err) + { + idvec_merge (implied_gids, cache); + ui = malloc (sizeof (struct uid_implies)); + if (ui) + { + ui->uid = uid; + ui->implies = cache; + ui->next = uid_implies_cache; + uid_implies_cache = ui; + } + else + idvec_free (cache); + } + } + + return err; + } +} + +/* Add to GIDS those group ids implied by the users in UIDS. */ +error_t +idvec_merge_implied_gids (struct idvec *gids, const struct idvec *uids) +{ + int i; + error_t err = 0; + for (i = 0; i < uids->num && !err; i++) + err = _merge_implied_gids (gids, uids->ids[i]); + return err; +} -- cgit v1.2.3