int
__nscd_getgrouplist (const char *user, gid_t group, long int *size,
gid_t **groupsp, long int limit)
{
size_t userlen = strlen (user) + 1;
int gc_cycle;
int nretries = 0;
/* If the mapping is available, try to search there instead of
communicating with the nscd. */
struct mapped_database *mapped;
mapped = __nscd_get_map_ref (GETFDGR, "group", &__gr_map_handle, &gc_cycle);
retry:;
char *respdata = NULL;
int retval = -1;
int sock = -1;
initgr_response_header initgr_resp;
if (mapped != NO_MAPPING)
{
struct datahead *found = __nscd_cache_search (INITGROUPS, user,
userlen, mapped,
sizeof initgr_resp);
if (found != NULL)
{
respdata = (char *) (&found->data[0].initgrdata + 1);
initgr_resp = found->data[0].initgrdata;
char *recend = (char *) found->data + found->recsize;
/* Now check if we can trust initgr_resp fields. If GC is
in progress, it can contain anything. */
if (mapped->head->gc_cycle != gc_cycle)
{
retval = -2;
goto out;
}
if (respdata + initgr_resp.ngrps * sizeof (int32_t) > recend)
goto out;
}
}
/* If we do not have the cache mapped, try to get the data over the
socket. */
if (respdata == NULL)
{
sock = __nscd_open_socket (user, userlen, INITGROUPS, &initgr_resp,
sizeof (initgr_resp));
if (sock == -1)
{
/* nscd not running or wrong version. */
__nss_not_use_nscd_group = 1;
goto out;
}
}
if (initgr_resp.found == 1)
{
/* The following code assumes that gid_t and int32_t are the
same size. This is the case for al existing implementation.
If this should change some code needs to be added which
doesn't use memcpy but instead copies each array element one
by one. */
assert (sizeof (int32_t) == sizeof (gid_t));
assert (initgr_resp.ngrps >= 0);
/* Make sure we have enough room. We always count GROUP in even
though we might not end up adding it. */
if (*size < initgr_resp.ngrps + 1)
{
gid_t *newp = realloc (*groupsp,
(initgr_resp.ngrps + 1) * sizeof (gid_t));
if (newp == NULL)
/* We cannot increase the buffer size. */
goto out_close;
*groupsp = newp;
*size = initgr_resp.ngrps + 1;
}
if (respdata == NULL)
{
/* Read the data from the socket. */
if ((size_t) __readall (sock, *groupsp, initgr_resp.ngrps
* sizeof (gid_t))
== initgr_resp.ngrps * sizeof (gid_t))
retval = initgr_resp.ngrps;
}
else
{
/* Just copy the data. */
retval = initgr_resp.ngrps;
memcpy (*groupsp, respdata, retval * sizeof (gid_t));
}
}
else
{
if (__glibc_unlikely (initgr_resp.found == -1))
{
/* The daemon does not cache this database. */
__nss_not_use_nscd_group = 1;
goto out_close;
}
/* No group found yet. */
retval = 0;
assert (*size >= 1);
}
/* Check whether GROUP is part of the mix. If not, add it. */
if (retval >= 0)
{
int cnt;
for (cnt = 0; cnt < retval; ++cnt)
if ((*groupsp)[cnt] == group)
break;
if (cnt == retval)
(*groupsp)[retval++] = group;
}
out_close:
if (sock != -1)
close_not_cancel_no_status (sock);
out:
if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
{
/* When we come here this means there has been a GC cycle while we
were looking for the data. This means the data might have been
inconsistent. Retry if possible. */
if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1)
{
/* nscd is just running gc now. Disable using the mapping. */
if (atomic_decrement_val (&mapped->counter) == 0)
__nscd_unmap (mapped);
mapped = NO_MAPPING;
}
if (retval != -1)
goto retry;
}
return retval;
}
static int
internal_function
nscd_getpw_r (const char *key, size_t keylen, request_type type,
struct passwd *resultbuf, char *buffer, size_t buflen,
struct passwd **result)
{
int gc_cycle;
int nretries = 0;
/* If the mapping is available, try to search there instead of
communicating with the nscd. */
struct mapped_database *mapped;
mapped = __nscd_get_map_ref (GETFDPW, "passwd", &map_handle, &gc_cycle);
retry:;
const char *pw_name = NULL;
int retval = -1;
const char *recend = (const char *) ~UINTMAX_C (0);
pw_response_header pw_resp;
if (mapped != NO_MAPPING)
{
struct datahead *found = __nscd_cache_search (type, key, keylen, mapped,
sizeof pw_resp);
if (found != NULL)
{
pw_name = (const char *) (&found->data[0].pwdata + 1);
pw_resp = found->data[0].pwdata;
recend = (const char *) found->data + found->recsize;
/* Now check if we can trust pw_resp fields. If GC is
in progress, it can contain anything. */
if (mapped->head->gc_cycle != gc_cycle)
{
retval = -2;
goto out;
}
}
}
int sock = -1;
if (pw_name == NULL)
{
sock = __nscd_open_socket (key, keylen, type, &pw_resp,
sizeof (pw_resp));
if (sock == -1)
{
__nss_not_use_nscd_passwd = 1;
goto out;
}
}
/* No value found so far. */
*result = NULL;
if (__glibc_unlikely (pw_resp.found == -1))
{
/* The daemon does not cache this database. */
__nss_not_use_nscd_passwd = 1;
goto out_close;
}
if (pw_resp.found == 1)
{
/* Set the information we already have. */
resultbuf->pw_uid = pw_resp.pw_uid;
resultbuf->pw_gid = pw_resp.pw_gid;
char *p = buffer;
/* get pw_name */
resultbuf->pw_name = p;
p += pw_resp.pw_name_len;
/* get pw_passwd */
resultbuf->pw_passwd = p;
p += pw_resp.pw_passwd_len;
/* get pw_gecos */
resultbuf->pw_gecos = p;
p += pw_resp.pw_gecos_len;
/* get pw_dir */
resultbuf->pw_dir = p;
p += pw_resp.pw_dir_len;
/* get pw_pshell */
resultbuf->pw_shell = p;
p += pw_resp.pw_shell_len;
ssize_t total = p - buffer;
if (__glibc_unlikely (pw_name + total > recend))
goto out_close;
if (__glibc_unlikely (buflen < total))
{
__set_errno (ERANGE);
retval = ERANGE;
goto out_close;
}
retval = 0;
if (pw_name == NULL)
{
ssize_t nbytes = __readall (sock, buffer, total);
if (__glibc_unlikely (nbytes != total))
{
/* The `errno' to some value != ERANGE. */
__set_errno (ENOENT);
retval = ENOENT;
}
else
*result = resultbuf;
}
else
{
/* Copy the various strings. */
memcpy (resultbuf->pw_name, pw_name, total);
/* Try to detect corrupt databases. */
if (resultbuf->pw_name[pw_resp.pw_name_len - 1] != '\0'
|| resultbuf->pw_passwd[pw_resp.pw_passwd_len - 1] != '\0'
|| resultbuf->pw_gecos[pw_resp.pw_gecos_len - 1] != '\0'
|| resultbuf->pw_dir[pw_resp.pw_dir_len - 1] != '\0'
|| resultbuf->pw_shell[pw_resp.pw_shell_len - 1] != '\0')
{
/* We cannot use the database. */
retval = mapped->head->gc_cycle != gc_cycle ? -2 : -1;
goto out_close;
}
*result = resultbuf;
}
}
else
{
/* Set errno to 0 to indicate no error, just no found record. */
__set_errno (0);
/* Even though we have not found anything, the result is zero. */
retval = 0;
}
out_close:
if (sock != -1)
close_not_cancel_no_status (sock);
out:
if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
{
/* When we come here this means there has been a GC cycle while we
were looking for the data. This means the data might have been
inconsistent. Retry if possible. */
if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1)
{
/* nscd is just running gc now. Disable using the mapping. */
if (atomic_decrement_val (&mapped->counter) == 0)
__nscd_unmap (mapped);
mapped = NO_MAPPING;
}
if (retval != -1)
goto retry;
}
return retval;
}
int
__nscd_setnetgrent (const char *group, struct __netgrent *datap)
{
int gc_cycle;
int nretries = 0;
size_t group_len = strlen (group) + 1;
/* If the mapping is available, try to search there instead of
communicating with the nscd. */
struct mapped_database *mapped;
mapped = __nscd_get_map_ref (GETFDNETGR, "netgroup", &map_handle, &gc_cycle);
retry:;
char *respdata = NULL;
int retval = -1;
netgroup_response_header netgroup_resp;
if (mapped != NO_MAPPING)
{
struct datahead *found = __nscd_cache_search (GETNETGRENT, group,
group_len, mapped,
sizeof netgroup_resp);
if (found != NULL)
{
respdata = (char *) (&found->data[0].netgroupdata + 1);
netgroup_resp = found->data[0].netgroupdata;
/* Now check if we can trust pw_resp fields. If GC is
in progress, it can contain anything. */
if (mapped->head->gc_cycle != gc_cycle)
{
retval = -2;
goto out;
}
}
}
int sock = -1;
if (respdata == NULL)
{
sock = __nscd_open_socket (group, group_len, GETNETGRENT,
&netgroup_resp, sizeof (netgroup_resp));
if (sock == -1)
{
/* nscd not running or wrong version. */
__nss_not_use_nscd_netgroup = 1;
goto out;
}
}
if (netgroup_resp.found == 1)
{
size_t datalen = netgroup_resp.result_len;
/* If we do not have to read the data here it comes from the
mapped data and does not have to be freed. */
if (respdata == NULL)
{
/* The data will come via the socket. */
respdata = malloc (datalen);
if (respdata == NULL)
goto out_close;
if ((size_t) __readall (sock, respdata, datalen) != datalen)
{
free (respdata);
goto out_close;
}
}
datap->data = respdata;
datap->data_size = datalen;
datap->cursor = respdata;
datap->first = 1;
datap->nip = (service_user *) -1l;
datap->known_groups = NULL;
datap->needed_groups = NULL;
retval = 1;
}
else
{
if (__glibc_unlikely (netgroup_resp.found == -1))
{
/* The daemon does not cache this database. */
__nss_not_use_nscd_netgroup = 1;
goto out_close;
}
/* Set errno to 0 to indicate no error, just no found record. */
__set_errno (0);
/* Even though we have not found anything, the result is zero. */
retval = 0;
}
out_close:
if (sock != -1)
close_not_cancel_no_status (sock);
out:
if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
{
/* When we come here this means there has been a GC cycle while we
were looking for the data. This means the data might have been
inconsistent. Retry if possible. */
if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1)
{
/* nscd is just running gc now. Disable using the mapping. */
if (atomic_decrement_val (&mapped->counter) == 0)
__nscd_unmap (mapped);
mapped = NO_MAPPING;
}
if (retval != -1)
goto retry;
}
return retval;
}
