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/* ISC license. */
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <skalibs/uint32.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/unix-timed.h>
#include <skalibs/posixishard.h>
#include <nsss/grp-def.h>
#include "nsss-switch-internal.h"
/*
Expects:
4 bytes gr_gid
4 bytes total length of strings (including \0's)
4 bytes number of strings in gr_mem (n)
\0-terminated gr_name
\0-terminated gr_passwd
sequence of n \0-terminated elements in gr_mem
*/
int nsss_switch_grp_read (buffer *b, struct group *gr, stralloc *sa, genalloc *ga, tain_t const *deadline, tain_t *stamp)
{
struct group grtmp ;
uint32_t total, len, n, x ;
char **q ;
char *p ;
char buf[12] ;
if (!buffer_timed_get(b, buf, 12, deadline, stamp)) return 0 ;
uint32_unpack_big(buf, &x) ; grtmp.gr_gid = x ;
uint32_unpack_big(buf + 4, &total) ;
uint32_unpack_big(buf + 8, &n) ;
if (total < 2 || n >= 0x30000000u) return (errno = EPROTO, 0) ;
if (!stralloc_readyplus(sa, total)) return 0 ;
if (!genalloc_readyplus(char *, ga, n+1)) return 0 ;
if (!buffer_timed_get(b, sa->s + sa->len, total, deadline, stamp)) return 0 ;
if (sa->s[sa->len + total - 1]) return (errno = EPROTO, 0) ;
p = sa->s + sa->len ; len = total ;
q = genalloc_s(char *, ga) + genalloc_len(char *, ga) ;
grtmp.gr_mem = q ;
grtmp.gr_name = p ; x = strnlen(p, len) + 1 ; p += x ; len -= x ;
if (!len) return (errno = EPROTO, 0) ;
grtmp.gr_passwd = p ; x = strnlen(p, len) + 1 ; p += x ; len -= x ;
for (uint32_t i = 0 ; i < n ; i++)
{
if (!len) return (errno = EPROTO, 0) ;
q[i] = p ; x = strnlen(p, len) + 1 ; p += x ; len -= x ;
}
if (len) return (errno = EPROTO, 0) ;
q[n] = 0 ;
sa->len += total ;
genalloc_setlen(char *, ga, genalloc_len(char *, ga) + n + 1) ;
*gr = grtmp ;
return 1 ;
}
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