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/* ISC license. */
#include <string.h>
#include <sys/uio.h>
#include <errno.h>
#include <skalibs/posixishard.h>
#include <skalibs/uint32.h>
#include <skalibs/uint64.h>
#include <skalibs/types.h>
#include <skalibs/buffer.h>
#include <skalibs/stralloc.h>
#include <skalibs/unix-timed.h>
#include <nsss/nsss-switch.h>
#include "nsss-switch-internal.h"
/*
Expects:
8 bytes: n
8 bytes: r
min(n, r) * sizeof(gid_t) bytes: the list of gids
*/
static int nsss_switch_grouplist_read (buffer *b, size_t n, size_t *r, gid_t *gids, stralloc *sa, tain const *deadline, tain *stamp)
{
size_t rr ;
uint64_t res ;
char buf[8] ;
if (!buffer_timed_get(b, buf, 8, deadline, stamp)) return 0 ;
uint64_unpack_big(buf, &res) ;
if (res != n) return (errno = EPROTO, 0) ;
if (!buffer_timed_get(b, buf, 8, deadline, stamp)) return 0 ;
uint64_unpack_big(buf, &res) ;
rr = res ;
if (res > n) res = n ;
if (res)
{
int sawasnull = !sa->s ;
size_t sabase = sa->len ;
if (!stralloc_readyplus(sa, res * sizeof(gid_t))) return 0 ;
if (!buffer_timed_get(b, sa->s + sabase, res * sizeof(gid_t), deadline, stamp))
{
if (sawasnull) stralloc_free(sa) ; else sa->len = sabase ;
return 0 ;
}
for (size_t i = 0 ; i < res ; i++)
gid_unpack_big(sa->s + sabase + i * sizeof(gid_t), gids + i) ;
if (sawasnull) stralloc_free(sa) ; else sa->len = sabase ;
}
*r = rr ;
return 1 ;
}
int nsss_switch_grp_getlist (nsss_switch_t *a, char const *user, gid_t *gids, size_t n, size_t *r, stralloc *sa, tain const *deadline, tain *stamp)
{
char buf[13] = { NSSS_SWITCH_GRP_GETLIST } ;
size_t len = strlen(user) ;
struct iovec v[2] = { { .iov_base = buf, .iov_len = 13 }, { .iov_base = (char *)user, .iov_len = len + 1 } } ;
if (len > NSSS_SWITCH_NAME_MAXLEN - 1) return (errno = EINVAL, 0) ;
uint64_pack_big(buf + 1, n) ;
uint32_pack_big(buf + 9, len + 1) ;
if (!nsss_switch_sendv(a, v, 2, deadline, stamp)) return 0 ;
if (!buffer_timed_get(&a->b, &buf[0], 1, deadline, stamp)) return 0 ;
if (buf[0]) return (errno = (unsigned char)buf[0], 0) ;
return nsss_switch_grouplist_read(&a->b, n, r, gids, sa, deadline, stamp) ;
}
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