nis_result *
nis_list (const_nis_name name, unsigned int flags,
int (*callback) (const_nis_name name,
const nis_object *object,
const void *userdata),
const void *userdata)
{
nis_result *res = calloc (1, sizeof (nis_result));
ib_request *ibreq;
int status;
enum clnt_stat clnt_status;
int count_links = 0; /* We will only follow NIS_MAXLINKS links! */
int done = 0;
nis_name *names;
nis_name namebuf[2] = {NULL, NULL};
int name_nr = 0;
nis_cb *cb = NULL;
char *tableptr;
char *tablepath = NULL;
int first_try = 0; /* Do we try the old binding at first ? */
if (res == NULL)
return NULL;
if (name == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
if ((ibreq = __create_ib_request (name, flags)) == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
if ((flags & EXPAND_NAME)
&& ibreq->ibr_name[strlen (ibreq->ibr_name) - 1] != '.')
{
names = nis_getnames (ibreq->ibr_name);
free (ibreq->ibr_name);
ibreq->ibr_name = NULL;
if (names == NULL)
{
nis_free_request (ibreq);
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
ibreq->ibr_name = strdup (names[name_nr]);
if (ibreq->ibr_name == NULL)
{
nis_freenames (names);
nis_free_request (ibreq);
NIS_RES_STATUS (res) = NIS_NOMEMORY;
return res;
}
}
else
{
names = namebuf;
names[name_nr] = ibreq->ibr_name;
}
cb = NULL;
while (!done)
{
dir_binding bptr;
directory_obj *dir = NULL;
memset (res, '\0', sizeof (nis_result));
status = __nisfind_server (ibreq->ibr_name, &dir);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
goto fail3;
}
status = __nisbind_create (&bptr, dir->do_servers.do_servers_val,
dir->do_servers.do_servers_len, flags);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
goto fail2;
}
while (__nisbind_connect (&bptr) != NIS_SUCCESS)
if (__nisbind_next (&bptr) != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
goto fail;
}
if (callback != NULL)
{
cb = __nis_create_callback (callback, userdata, flags);
ibreq->ibr_cbhost.ibr_cbhost_len = 1;
ibreq->ibr_cbhost.ibr_cbhost_val = cb->serv;
}
again:
clnt_status = clnt_call (bptr.clnt, NIS_IBLIST,
(xdrproc_t) _xdr_ib_request, (caddr_t) ibreq,
(xdrproc_t) _xdr_nis_result,
(caddr_t) res, RPCTIMEOUT);
if (clnt_status != RPC_SUCCESS)
NIS_RES_STATUS (res) = NIS_RPCERROR;
else
switch (NIS_RES_STATUS (res))
{ /* start switch */
case NIS_PARTIAL:
case NIS_SUCCESS:
case NIS_S_SUCCESS:
if (__type_of (NIS_RES_OBJECT (res)) == NIS_LINK_OBJ
&& (flags & FOLLOW_LINKS)) /* We are following links. */
{
free (ibreq->ibr_name);
ibreq->ibr_name = NULL;
/* If we hit the link limit, bail. */
if (count_links > NIS_MAXLINKS)
{
NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
++done;
break;
}
++count_links;
ibreq->ibr_name =
strdup (NIS_RES_OBJECT (res)->LI_data.li_name);
if (ibreq->ibr_name == NULL)
{
NIS_RES_STATUS (res) = NIS_NOMEMORY;
fail:
__nisbind_destroy (&bptr);
fail2:
nis_free_directory (dir);
fail3:
free (tablepath);
if (cb)
{
__nis_destroy_callback (cb);
ibreq->ibr_cbhost.ibr_cbhost_len = 0;
ibreq->ibr_cbhost.ibr_cbhost_val = NULL;
}
if (names != namebuf)
nis_freenames (names);
nis_free_request (ibreq);
return res;
}
if (NIS_RES_OBJECT (res)->LI_data.li_attrs.li_attrs_len)
if (ibreq->ibr_srch.ibr_srch_len == 0)
{
ibreq->ibr_srch.ibr_srch_len =
NIS_RES_OBJECT (res)->LI_data.li_attrs.li_attrs_len;
ibreq->ibr_srch.ibr_srch_val =
NIS_RES_OBJECT (res)->LI_data.li_attrs.li_attrs_val;
}
/* The following is a non-obvious optimization. A
nis_freeresult call would call xdr_free as the
following code. But it also would unnecessarily
free the result structure. We avoid this here
along with the necessary tests. */
#if 1
xdr_free ((xdrproc_t) _xdr_nis_result, (char *)res);
memset (res, '\0', sizeof (*res));
#else
nis_freeresult (res);
res = calloc (1, sizeof (nis_result));
if (res == NULL)
goto fail;
#endif
first_try = 1; /* Try at first the old binding */
goto again;
}
else if ((flags & FOLLOW_PATH)
&& NIS_RES_STATUS (res) == NIS_PARTIAL)
{
if (tablepath == NULL)
{
tablepath = __get_tablepath (ibreq->ibr_name, &bptr);
tableptr = tablepath;
}
if (tableptr == NULL)
{
++done;
break;
}
free (ibreq->ibr_name);
ibreq->ibr_name = strsep (&tableptr, ":");
if (ibreq->ibr_name == NULL || ibreq->ibr_name[0] == '\0')
{
ibreq->ibr_name = strdup ("");
if (ibreq->ibr_name == NULL)
{
NIS_RES_STATUS (res) = NIS_NOMEMORY;
goto fail;
}
++done;
}
else
{
ibreq->ibr_name = strdup (ibreq->ibr_name);
/* The following is a non-obvious optimization. A
nis_freeresult call would call xdr_free as the
following code. But it also would unnecessarily
free the result structure. We avoid this here
along with the necessary tests. */
#if 1
xdr_free ((xdrproc_t) _xdr_nis_result, (char *)res);
memset (res, '\0', sizeof (*res));
if (ibreq->ibr_name == NULL)
{
NIS_RES_STATUS (res) = NIS_NOMEMORY;
goto fail;
}
#else
nis_freeresult (res);
res = calloc (1, sizeof (nis_result));
if (res == NULL || ibreq->ibr_name == NULL)
{
free (res);
res = NULL;
goto fail;
}
#endif
first_try = 1;
goto again;
}
}
else
++done;
break;
case NIS_CBRESULTS:
if (cb != NULL)
{
__nis_do_callback (&bptr, &res->cookie, cb);
NIS_RES_STATUS (res) = cb->result;
if (!(flags & ALL_RESULTS))
++done;
else
{
if (tablepath == NULL)
{
tablepath = __get_tablepath (ibreq->ibr_name, &bptr);
tableptr = tablepath;
}
if (tableptr == NULL)
{
++done;
break;
}
free (ibreq->ibr_name);
ibreq->ibr_name = strsep (&tableptr, ":");
if (ibreq->ibr_name == NULL || ibreq->ibr_name[0] == '\0')
{
ibreq->ibr_name = strdup ("");
++done;
}
else
ibreq->ibr_name = strdup (ibreq->ibr_name);
if (ibreq->ibr_name == NULL)
{
NIS_RES_STATUS (res) = NIS_NOMEMORY;
goto fail;
}
}
}
break;
case NIS_SYSTEMERROR:
case NIS_NOSUCHNAME:
case NIS_NOT_ME:
/* If we had first tried the old binding, do nothing, but
get a new binding */
if (!first_try)
{
if (__nisbind_next (&bptr) != NIS_SUCCESS)
{
++done;
break; /* No more servers to search */
}
while (__nisbind_connect (&bptr) != NIS_SUCCESS)
{
if (__nisbind_next (&bptr) != NIS_SUCCESS)
{
++done;
break; /* No more servers to search */
}
}
goto again;
}
break;
default:
if (!first_try)
{
/* Try the next domainname if we don't follow a link. */
free (ibreq->ibr_name);
ibreq->ibr_name = NULL;
if (count_links)
{
NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
++done;
break;
}
++name_nr;
if (names[name_nr] == NULL)
{
++done;
break;
}
ibreq->ibr_name = strdup (names[name_nr]);
if (ibreq->ibr_name == NULL)
{
NIS_RES_STATUS (res) = NIS_NOMEMORY;
goto fail;
}
first_try = 1; /* Try old binding at first */
goto again;
}
break;
}
first_try = 0;
if (cb)
{
__nis_destroy_callback (cb);
ibreq->ibr_cbhost.ibr_cbhost_len = 0;
ibreq->ibr_cbhost.ibr_cbhost_val = NULL;
cb = NULL;
}
__nisbind_destroy (&bptr);
nis_free_directory (dir);
}
free (tablepath);
if (names != namebuf)
nis_freenames (names);
nis_free_request (ibreq);
return res;
}
nis_result *
nis_lookup (const_nis_name name, const unsigned int flags)
{
nis_result *res = calloc (1, sizeof (nis_result));
struct ns_request req;
nis_name *names;
nis_error status;
int link_first_try = 0;
int count_links = 0; /* We will follow only 16 links in the deep */
int done = 0;
int name_nr = 0;
nis_name namebuf[2] = {NULL, NULL};
if (res == NULL)
return NULL;
if ((flags & EXPAND_NAME) && (name[strlen (name) - 1] != '.'))
{
names = nis_getnames (name);
if (names == NULL)
{
NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
return res;
}
}
else
{
names = namebuf;
names[0] = (nis_name)name;
}
req.ns_name = names[0];
while (!done)
{
dir_binding bptr;
directory_obj *dir = NULL;
req.ns_object.ns_object_len = 0;
req.ns_object.ns_object_val = NULL;
status = __nisfind_server (req.ns_name, &dir);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
return res;
}
status = __nisbind_create (&bptr, dir->do_servers.do_servers_val,
dir->do_servers.do_servers_len, flags);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
nis_free_directory (dir);
return res;
}
while (__nisbind_connect (&bptr) != NIS_SUCCESS)
{
if (__nisbind_next (&bptr) != NIS_SUCCESS)
{
__nisbind_destroy (&bptr);
nis_free_directory (dir);
NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
return res;
}
}
do
{
static struct timeval RPCTIMEOUT = {10, 0};
enum clnt_stat result;
again:
result = clnt_call (bptr.clnt, NIS_LOOKUP,
(xdrproc_t) _xdr_ns_request,
(caddr_t) &req, (xdrproc_t) _xdr_nis_result,
(caddr_t) res, RPCTIMEOUT);
if (result != RPC_SUCCESS)
status = NIS_RPCERROR;
else
{
status = NIS_SUCCESS;
if (NIS_RES_STATUS (res) == NIS_SUCCESS)
{
if (__type_of(NIS_RES_OBJECT (res)) == NIS_LINK_OBJ &&
flags & FOLLOW_LINKS) /* We are following links */
{
if (count_links)
free (req.ns_name);
/* if we hit the link limit, bail */
if (count_links > NIS_MAXLINKS)
{
NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
break;
}
++count_links;
req.ns_name =
strdup (NIS_RES_OBJECT (res)->LI_data.li_name);
if (req.ns_name == NULL)
return NULL;
nis_freeresult (res);
res = calloc (1, sizeof (nis_result));
if (res == NULL)
{
__nisbind_destroy (&bptr);
return NULL;
}
link_first_try = 1; /* Try at first the old binding */
goto again;
}
}
else
if ((NIS_RES_STATUS (res) == NIS_SYSTEMERROR) ||
(NIS_RES_STATUS (res) == NIS_NOSUCHNAME) ||
(NIS_RES_STATUS (res) == NIS_NOT_ME))
{
if (link_first_try)
{
__nisbind_destroy (&bptr);
nis_free_directory (dir);
if (__nisfind_server (req.ns_name, &dir) != NIS_SUCCESS)
return res;
if (__nisbind_create (&bptr,
dir->do_servers.do_servers_val,
dir->do_servers.do_servers_len,
flags) != NIS_SUCCESS)
{
nis_free_directory (dir);
return res;
}
}
else
if (__nisbind_next (&bptr) != NIS_SUCCESS)
break; /* No more servers to search */
while (__nisbind_connect (&bptr) != NIS_SUCCESS)
{
if (__nisbind_next (&bptr) != NIS_SUCCESS)
{
__nisbind_destroy (&bptr);
nis_free_directory (dir);
return res;
}
}
goto again;
}
break;
}
link_first_try = 0; /* Set it back */
}
while ((flags & HARD_LOOKUP) && status == NIS_RPCERROR);
__nisbind_destroy (&bptr);
nis_free_directory (dir);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
return res;
}
switch (NIS_RES_STATUS (res))
{
case NIS_PARTIAL:
case NIS_SUCCESS:
case NIS_S_SUCCESS:
case NIS_LINKNAMEERROR: /* We follow to max links */
case NIS_UNAVAIL: /* NIS+ is not installed, or all servers are down */
++done;
break;
default:
/* Try the next domainname if we don't follow a link */
if (count_links)
{
free (req.ns_name);
NIS_RES_STATUS (res) = NIS_LINKNAMEERROR;
++done;
break;
}
++name_nr;
if (names[name_nr] == NULL)
{
++done;
break;
}
req.ns_name = names[name_nr];
break;
}
}
if (names != namebuf)
nis_freenames (names);
return res;
}
