static gid_t
gr_gidpolicy(struct userconf * cnf, long id)
{
struct group *grp;
gid_t gid = (gid_t) - 1;
/*
* Check the given gid, if any
*/
if (id > 0) {
gid = (gid_t) id;
if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate)
errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid);
} else {
struct bitmap bm;
/*
* We need to allocate the next available gid under one of
* two policies a) Grab the first unused gid b) Grab the
* highest possible unused gid
*/
if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */
cnf->min_gid = 1000;
cnf->max_gid = 32000;
}
bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
/*
* Now, let's fill the bitmap from the password file
*/
SETGRENT();
while ((grp = GETGRENT()) != NULL)
if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
(gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
ENDGRENT();
/*
* Then apply the policy, with fallback to reuse if necessary
*/
if (cnf->reuse_gids)
gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
else {
gid = (gid_t) (bm_lastset(&bm) + 1);
if (!bm_isset(&bm, gid))
gid += cnf->min_gid;
else
gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
}
/*
* Another sanity check
*/
if (gid < cnf->min_gid || gid > cnf->max_gid)
errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
bm_dealloc(&bm);
}
return gid;
}
static uid_t
pw_uidpolicy(struct userconf * cnf, struct cargs * args)
{
struct passwd *pwd;
uid_t uid = (uid_t) - 1;
struct carg *a_uid = getarg(args, 'u');
/*
* Check the given uid, if any
*/
if (a_uid != NULL) {
uid = (uid_t) atol(a_uid->val);
if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL)
errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid);
} else {
struct bitmap bm;
/*
* We need to allocate the next available uid under one of
* two policies a) Grab the first unused uid b) Grab the
* highest possible unused uid
*/
if (cnf->min_uid >= cnf->max_uid) { /* Sanity
* claus^H^H^H^Hheck */
cnf->min_uid = 1000;
cnf->max_uid = 32000;
}
bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);
/*
* Now, let's fill the bitmap from the password file
*/
SETPWENT();
while ((pwd = GETPWENT()) != NULL)
if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid)
bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
ENDPWENT();
/*
* Then apply the policy, with fallback to reuse if necessary
*/
if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);
/*
* Another sanity check
*/
if (uid < cnf->min_uid || uid > cnf->max_uid)
errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used");
bm_dealloc(&bm);
}
return uid;
}