mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 04:50:07 +00:00
127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
/* Prototype for the setgrent functions we use here. */
|
|
typedef enum nss_status (*set_function) (void);
|
|
|
|
/* Prototype for the endgrent functions we use here. */
|
|
typedef enum nss_status (*end_function) (void);
|
|
|
|
/* Prototype for the setgrent functions we use here. */
|
|
typedef enum nss_status (*get_function) (struct group *, char *,
|
|
size_t, int *);
|
|
|
|
|
|
static enum nss_status
|
|
compat_call (service_user *nip, const char *user, gid_t group, long int *start,
|
|
long int *size, gid_t **groupsp, long int limit, int *errnop)
|
|
{
|
|
struct group grpbuf;
|
|
size_t buflen = __sysconf (_SC_GETGR_R_SIZE_MAX);
|
|
enum nss_status status;
|
|
set_function setgrent_fct;
|
|
get_function getgrent_fct;
|
|
end_function endgrent_fct;
|
|
gid_t *groups = *groupsp;
|
|
|
|
getgrent_fct = __nss_lookup_function (nip, "getgrent_r");
|
|
if (getgrent_fct == NULL)
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
setgrent_fct = __nss_lookup_function (nip, "setgrent");
|
|
if (setgrent_fct)
|
|
{
|
|
status = DL_CALL_FCT (setgrent_fct, ());
|
|
if (status != NSS_STATUS_SUCCESS)
|
|
return status;
|
|
}
|
|
|
|
endgrent_fct = __nss_lookup_function (nip, "endgrent");
|
|
|
|
char *tmpbuf = __alloca (buflen);
|
|
bool use_malloc = false;
|
|
enum nss_status result = NSS_STATUS_SUCCESS;
|
|
|
|
do
|
|
{
|
|
while ((status = DL_CALL_FCT (getgrent_fct,
|
|
(&grpbuf, tmpbuf, buflen, errnop)),
|
|
status == NSS_STATUS_TRYAGAIN)
|
|
&& *errnop == ERANGE)
|
|
{
|
|
if (__libc_use_alloca (buflen * 2))
|
|
tmpbuf = extend_alloca (tmpbuf, buflen, buflen * 2);
|
|
else
|
|
{
|
|
buflen *= 2;
|
|
char *newbuf = realloc (use_malloc ? tmpbuf : NULL, buflen);
|
|
if (newbuf == NULL)
|
|
{
|
|
result = NSS_STATUS_TRYAGAIN;
|
|
goto done;
|
|
}
|
|
use_malloc = true;
|
|
tmpbuf = newbuf;
|
|
}
|
|
}
|
|
|
|
if (status != NSS_STATUS_SUCCESS)
|
|
goto done;
|
|
|
|
if (grpbuf.gr_gid != group)
|
|
{
|
|
char **m;
|
|
|
|
for (m = grpbuf.gr_mem; *m != NULL; ++m)
|
|
if (strcmp (*m, user) == 0)
|
|
{
|
|
/* Check whether the group is already on the list. */
|
|
long int cnt;
|
|
for (cnt = 0; cnt < *start; ++cnt)
|
|
if (groups[cnt] == grpbuf.gr_gid)
|
|
break;
|
|
|
|
if (cnt == *start)
|
|
{
|
|
/* Matches user and not yet on the list. Insert
|
|
this group. */
|
|
if (__glibc_unlikely (*start == *size))
|
|
{
|
|
/* Need a bigger buffer. */
|
|
gid_t *newgroups;
|
|
long int newsize;
|
|
|
|
if (limit > 0 && *size == limit)
|
|
/* We reached the maximum. */
|
|
goto done;
|
|
|
|
if (limit <= 0)
|
|
newsize = 2 * *size;
|
|
else
|
|
newsize = MIN (limit, 2 * *size);
|
|
|
|
newgroups = realloc (groups,
|
|
newsize * sizeof (*groups));
|
|
if (newgroups == NULL)
|
|
goto done;
|
|
*groupsp = groups = newgroups;
|
|
*size = newsize;
|
|
}
|
|
|
|
groups[*start] = grpbuf.gr_gid;
|
|
*start += 1;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
while (status == NSS_STATUS_SUCCESS);
|
|
|
|
done:
|
|
if (use_malloc)
|
|
free (tmpbuf);
|
|
|
|
if (endgrent_fct)
|
|
DL_CALL_FCT (endgrent_fct, ());
|
|
|
|
return result;
|
|
}
|