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glibc/nis/nis_table.c
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines 
We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-09-03 22:06:44 +05:30

813 lines
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/* Copyright (c) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <string.h>
#include <rpcsvc/nis.h>
#include <libc-diag.h>
#include <shlib-compat.h>
#include "nis_xdr.h"
#include "nis_intern.h"
#include "libnsl.h"
struct ib_request *
__create_ib_request (const_nis_name name, unsigned int flags)
{
struct ib_request *ibreq = calloc (1, sizeof (struct ib_request));
nis_attr *search_val = NULL;
size_t search_len = 0;
size_t size = 0;
if (ibreq == NULL)
return NULL;
ibreq->ibr_flags = flags;
char *cptr = strdupa (name);
/* Not of "[key=value,key=value,...],foo.." format? */
if (cptr[0] != '[')
{
ibreq->ibr_name = strdup (cptr);
if (ibreq->ibr_name == NULL)
{
free (ibreq);
return NULL;
}
return ibreq;
}
/* "[key=value,...],foo" format */
ibreq->ibr_name = strchr (cptr, ']');
if (ibreq->ibr_name == NULL || ibreq->ibr_name[1] != ',')
{
/* The object has not really been built yet so we use free. */
free (ibreq);
return NULL;
}
/* Check if we have an entry of "[key=value,],bar". If, remove the "," */
if (ibreq->ibr_name[-1] == ',')
ibreq->ibr_name[-1] = '\0';
else
ibreq->ibr_name[0] = '\0';
ibreq->ibr_name += 2;
ibreq->ibr_name = strdup (ibreq->ibr_name);
if (ibreq->ibr_name == NULL)
{
free_null:
while (search_len-- > 0)
{
free (search_val[search_len].zattr_ndx);
free (search_val[search_len].zattr_val.zattr_val_val);
}
free (search_val);
nis_free_request (ibreq);
return NULL;
}
++cptr; /* Remove "[" */
while (cptr != NULL && cptr[0] != '\0')
{
char *key = cptr;
char *val = strchr (cptr, '=');
cptr = strchr (key, ',');
if (cptr != NULL)
*cptr++ = '\0';
if (__glibc_unlikely (val == NULL))
{
nis_free_request (ibreq);
return NULL;
}
*val++ = '\0';
if (search_len + 1 >= size)
{
size += 1;
nis_attr *newp = realloc (search_val, size * sizeof (nis_attr));
if (newp == NULL)
goto free_null;
search_val = newp;
}
search_val[search_len].zattr_ndx = strdup (key);
if (search_val[search_len].zattr_ndx == NULL)
goto free_null;
search_val[search_len].zattr_val.zattr_val_len = strlen (val) + 1;
search_val[search_len].zattr_val.zattr_val_val = strdup (val);
if (search_val[search_len].zattr_val.zattr_val_val == NULL)
{
free (search_val[search_len].zattr_ndx);
goto free_null;
}
++search_len;
}
ibreq->ibr_srch.ibr_srch_val = search_val;
ibreq->ibr_srch.ibr_srch_len = search_len;
return ibreq;
}
libnsl_hidden_nolink_def (__create_ib_request, GLIBC_PRIVATE)
static const struct timeval RPCTIMEOUT = {10, 0};
static char *
get_tablepath (char *name, dir_binding *bptr)
{
enum clnt_stat result;
nis_result res;
struct ns_request req;
memset (&res, '\0', sizeof (res));
req.ns_name = name;
req.ns_object.ns_object_len = 0;
req.ns_object.ns_object_val = NULL;
result = clnt_call (bptr->clnt, NIS_LOOKUP, (xdrproc_t) _xdr_ns_request,
(caddr_t) &req, (xdrproc_t) _xdr_nis_result,
(caddr_t) &res, RPCTIMEOUT);
const char *cptr;
if (result == RPC_SUCCESS && NIS_RES_STATUS (&res) == NIS_SUCCESS
&& __type_of (NIS_RES_OBJECT (&res)) == NIS_TABLE_OBJ)
cptr = NIS_RES_OBJECT (&res)->TA_data.ta_path;
else
cptr = "";
char *str = strdup (cptr);
if (result == RPC_SUCCESS)
xdr_free ((xdrproc_t) _xdr_nis_result, (char *) &res);
return str;
}
nis_error
__follow_path (char **tablepath, char **tableptr, struct ib_request *ibreq,
dir_binding *bptr)
{
if (*tablepath == NULL)
{
*tablepath = get_tablepath (ibreq->ibr_name, bptr);
if (*tablepath == NULL)
return NIS_NOMEMORY;
*tableptr = *tablepath;
}
/* Since tableptr is only set here, and it's set when tablepath is NULL,
which it is initially defined as, we know it will always be set here. */
DIAG_PUSH_NEEDS_COMMENT;
DIAG_IGNORE_NEEDS_COMMENT (4.7, "-Wmaybe-uninitialized");
if (*tableptr == NULL)
return NIS_NOTFOUND;
char *newname = strsep (tableptr, ":");
if (newname[0] == '\0')
return NIS_NOTFOUND;
DIAG_POP_NEEDS_COMMENT;
newname = strdup (newname);
if (newname == NULL)
return NIS_NOMEMORY;
free (ibreq->ibr_name);
ibreq->ibr_name = newname;
return NIS_SUCCESS;
}
libnsl_hidden_nolink_def (__follow_path, GLIBC_PRIVATE)
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 = malloc (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 ? */
nis_result *allres = NULL;
if (res == NULL)
return NULL;
if (name == NULL)
{
status = NIS_BADNAME;
err_out:
nis_freeresult (allres);
memset (res, '\0', sizeof (nis_result));
NIS_RES_STATUS (res) = status;
return res;
}
ibreq = __create_ib_request (name, flags);
if (ibreq == NULL)
{
status = NIS_BADNAME;
goto err_out;
}
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);
status = NIS_BADNAME;
goto err_out;
}
ibreq->ibr_name = strdup (names[name_nr]);
if (ibreq->ibr_name == NULL)
{
nis_freenames (names);
nis_free_request (ibreq);
status = NIS_NOMEMORY;
goto err_out;
}
}
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,
ibreq->ibr_srch.ibr_srch_val != NULL,
&dir, &bptr, flags & ~MASTER_ONLY);
if (status != NIS_SUCCESS)
{
NIS_RES_STATUS (res) = status;
goto fail3;
}
while (__nisbind_connect (&bptr) != NIS_SUCCESS)
if (__glibc_unlikely (__nisbind_next (&bptr) != NIS_SUCCESS))
{
NIS_RES_STATUS (res) = NIS_NAMEUNREACHABLE;
goto fail;
}
if (callback != NULL)
{
assert (cb == 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 (__glibc_unlikely (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 (__glibc_unlikely (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);
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);
nis_freeresult (allres);
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. */
xdr_free ((xdrproc_t) _xdr_nis_result, (char *)res);
memset (res, '\0', sizeof (*res));
first_try = 1; /* Try at first the old binding */
goto again;
}
else if ((flags & FOLLOW_PATH)
&& NIS_RES_STATUS (res) == NIS_PARTIAL)
{
enum nis_error err = __follow_path (&tablepath, &tableptr,
ibreq, &bptr);
if (err != NIS_SUCCESS)
{
if (err == NIS_NOMEMORY)
NIS_RES_STATUS (res) = err;
++done;
}
else
{
/* 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. */
xdr_free ((xdrproc_t) _xdr_nis_result, (char *) res);
memset (res, '\0', sizeof (*res));
first_try = 1;
goto again;
}
}
else if ((flags & (FOLLOW_PATH | ALL_RESULTS))
== (FOLLOW_PATH | ALL_RESULTS))
{
if (allres == NULL)
{
allres = res;
res = malloc (sizeof (nis_result));
if (res == NULL)
{
res = allres;
allres = NULL;
NIS_RES_STATUS (res) = NIS_NOMEMORY;
goto fail;
}
NIS_RES_STATUS (res) = NIS_RES_STATUS (allres);
}
else
{
nis_object *objects_val
= realloc (NIS_RES_OBJECT (allres),
(NIS_RES_NUMOBJ (allres)
+ NIS_RES_NUMOBJ (res))
* sizeof (nis_object));
if (objects_val == NULL)
{
NIS_RES_STATUS (res) = NIS_NOMEMORY;
goto fail;
}
NIS_RES_OBJECT (allres) = objects_val;
memcpy (NIS_RES_OBJECT (allres) + NIS_RES_NUMOBJ (allres),
NIS_RES_OBJECT (res),
NIS_RES_NUMOBJ (res) * sizeof (nis_object));
NIS_RES_NUMOBJ (allres) += NIS_RES_NUMOBJ (res);
NIS_RES_NUMOBJ (res) = 0;
free (NIS_RES_OBJECT (res));
NIS_RES_OBJECT (res) = NULL;
NIS_RES_STATUS (allres) = NIS_RES_STATUS (res);
xdr_free ((xdrproc_t) _xdr_nis_result, (char *) res);
}
enum nis_error err = __follow_path (&tablepath, &tableptr,
ibreq, &bptr);
if (err != NIS_SUCCESS)
{
/* Prepare for the nis_freeresult call. */
memset (res, '\0', sizeof (*res));
if (err == NIS_NOMEMORY)
NIS_RES_STATUS (allres) = err;
++done;
}
}
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
{
enum nis_error err
= __follow_path (&tablepath, &tableptr, ibreq, &bptr);
if (err != NIS_SUCCESS)
{
if (err == NIS_NOMEMORY)
NIS_RES_STATUS (res) = err;
++done;
}
}
}
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 (__glibc_unlikely (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);
if (allres)
{
nis_freeresult (res);
return allres;
}
return res;
}
libnsl_hidden_nolink_def (nis_list, GLIBC_2_1)
nis_result *
nis_add_entry (const_nis_name name, const nis_object *obj2, unsigned int flags)
{
nis_result *res = calloc (1, sizeof (nis_result));
if (res == NULL)
return NULL;
if (name == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
ib_request *ibreq = __create_ib_request (name, flags);
if (ibreq == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
nis_object obj;
memcpy (&obj, obj2, sizeof (nis_object));
size_t namelen = strlen (name);
char buf1[namelen + 20];
char buf4[namelen + 20];
if (obj.zo_name == NULL || strlen (obj.zo_name) == 0)
obj.zo_name = nis_leaf_of_r (name, buf1, sizeof (buf1));
if (obj.zo_owner == NULL || strlen (obj.zo_owner) == 0)
obj.zo_owner = nis_local_principal ();
if (obj.zo_group == NULL || strlen (obj.zo_group) == 0)
obj.zo_group = nis_local_group ();
obj.zo_domain = nis_domain_of_r (name, buf4, sizeof (buf4));
ibreq->ibr_obj.ibr_obj_val = nis_clone_object (&obj, NULL);
if (ibreq->ibr_obj.ibr_obj_val == NULL)
{
nis_free_request (ibreq);
NIS_RES_STATUS (res) = NIS_NOMEMORY;
return res;
}
ibreq->ibr_obj.ibr_obj_len = 1;
nis_error status = __do_niscall (ibreq->ibr_name, NIS_IBADD,
(xdrproc_t) _xdr_ib_request,
(caddr_t) ibreq,
(xdrproc_t) _xdr_nis_result,
(caddr_t) res, 0, NULL);
if (__glibc_unlikely (status != NIS_SUCCESS))
NIS_RES_STATUS (res) = status;
nis_free_request (ibreq);
return res;
}
libnsl_hidden_nolink_def (nis_add_entry, GLIBC_2_1)
nis_result *
nis_modify_entry (const_nis_name name, const nis_object *obj2,
unsigned int flags)
{
nis_object obj;
nis_result *res;
nis_error status;
ib_request *ibreq;
size_t namelen = strlen (name);
char buf1[namelen + 20];
char buf4[namelen + 20];
res = calloc (1, sizeof (nis_result));
if (res == NULL)
return NULL;
ibreq = __create_ib_request (name, flags);
if (ibreq == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
memcpy (&obj, obj2, sizeof (nis_object));
if (obj.zo_name == NULL || strlen (obj.zo_name) == 0)
obj.zo_name = nis_leaf_of_r (name, buf1, sizeof (buf1));
if (obj.zo_owner == NULL || strlen (obj.zo_owner) == 0)
obj.zo_owner = nis_local_principal ();
if (obj.zo_group == NULL || strlen (obj.zo_group) == 0)
obj.zo_group = nis_local_group ();
obj.zo_domain = nis_domain_of_r (name, buf4, sizeof (buf4));
ibreq->ibr_obj.ibr_obj_val = nis_clone_object (&obj, NULL);
if (ibreq->ibr_obj.ibr_obj_val == NULL)
{
nis_free_request (ibreq);
NIS_RES_STATUS (res) = NIS_NOMEMORY;
return res;
}
ibreq->ibr_obj.ibr_obj_len = 1;
status = __do_niscall (ibreq->ibr_name, NIS_IBMODIFY,
(xdrproc_t) _xdr_ib_request,
(caddr_t) ibreq, (xdrproc_t) _xdr_nis_result,
(caddr_t) res, 0, NULL);
if (__glibc_unlikely (status != NIS_SUCCESS))
NIS_RES_STATUS (res) = status;
nis_free_request (ibreq);
return res;
}
libnsl_hidden_nolink_def (nis_modify_entry, GLIBC_2_1)
nis_result *
nis_remove_entry (const_nis_name name, const nis_object *obj,
unsigned int flags)
{
nis_result *res;
ib_request *ibreq;
nis_error status;
res = calloc (1, sizeof (nis_result));
if (res == NULL)
return NULL;
if (name == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
ibreq = __create_ib_request (name, flags);
if (ibreq == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
if (obj != NULL)
{
ibreq->ibr_obj.ibr_obj_val = nis_clone_object (obj, NULL);
if (ibreq->ibr_obj.ibr_obj_val == NULL)
{
nis_free_request (ibreq);
NIS_RES_STATUS (res) = NIS_NOMEMORY;
return res;
}
ibreq->ibr_obj.ibr_obj_len = 1;
}
if ((status = __do_niscall (ibreq->ibr_name, NIS_IBREMOVE,
(xdrproc_t) _xdr_ib_request,
(caddr_t) ibreq, (xdrproc_t) _xdr_nis_result,
(caddr_t) res, 0, NULL)) != NIS_SUCCESS)
NIS_RES_STATUS (res) = status;
nis_free_request (ibreq);
return res;
}
libnsl_hidden_nolink_def (nis_remove_entry, GLIBC_2_1)
nis_result *
nis_first_entry (const_nis_name name)
{
nis_result *res;
ib_request *ibreq;
nis_error status;
res = calloc (1, sizeof (nis_result));
if (res == NULL)
return NULL;
if (name == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
ibreq = __create_ib_request (name, 0);
if (ibreq == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
status = __do_niscall (ibreq->ibr_name, NIS_IBFIRST,
(xdrproc_t) _xdr_ib_request,
(caddr_t) ibreq, (xdrproc_t) _xdr_nis_result,
(caddr_t) res, 0, NULL);
if (__glibc_unlikely (status != NIS_SUCCESS))
NIS_RES_STATUS (res) = status;
nis_free_request (ibreq);
return res;
}
libnsl_hidden_nolink_def (nis_first_entry, GLIBC_2_1)
nis_result *
nis_next_entry (const_nis_name name, const netobj *cookie)
{
nis_result *res;
ib_request *ibreq;
nis_error status;
res = calloc (1, sizeof (nis_result));
if (res == NULL)
return NULL;
if (name == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
ibreq = __create_ib_request (name, 0);
if (ibreq == NULL)
{
NIS_RES_STATUS (res) = NIS_BADNAME;
return res;
}
if (cookie != NULL)
{
ibreq->ibr_cookie.n_bytes = cookie->n_bytes;
ibreq->ibr_cookie.n_len = cookie->n_len;
}
status = __do_niscall (ibreq->ibr_name, NIS_IBNEXT,
(xdrproc_t) _xdr_ib_request,
(caddr_t) ibreq, (xdrproc_t) _xdr_nis_result,
(caddr_t) res, 0, NULL);
if (__glibc_unlikely (status != NIS_SUCCESS))
NIS_RES_STATUS (res) = status;
if (cookie != NULL)
{
/* Don't give cookie free, it is not from us */
ibreq->ibr_cookie.n_bytes = NULL;
ibreq->ibr_cookie.n_len = 0;
}
nis_free_request (ibreq);
return res;
}
libnsl_hidden_nolink_def (nis_next_entry, GLIBC_2_1)
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