+++ /dev/null
-/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
-
- 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 <atomic.h>
-#include <ctype.h>
-#include <errno.h>
-#include <netdb.h>
-#include <nss.h>
-#include <string.h>
-#include <rpcsvc/nis.h>
-#include <libc-lock.h>
-
-#include "nss-nisplus.h"
-
-__libc_lock_define_initialized (static, lock);
-
-static nis_result *result;
-static nis_name tablename_val;
-static u_long tablename_len;
-
-#define NISENTRYVAL(idx, col, res) \
- (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
-
-#define NISENTRYLEN(idx, col, res) \
- (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
-
-
-static int
-_nss_nisplus_parse_servent (nis_result *result, struct servent *serv,
- char *buffer, size_t buflen, int *errnop)
-{
- char *first_unused = buffer;
- size_t room_left = buflen;
-
- if (result == NULL)
- return 0;
-
- if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
- || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
- || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type, "services_tbl") != 0
- || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 4)
- return 0;
-
- if (NISENTRYLEN (0, 0, result) >= room_left)
- {
- no_more_room:
- *errnop = ERANGE;
- return -1;
- }
- strncpy (first_unused, NISENTRYVAL (0, 0, result),
- NISENTRYLEN (0, 0, result));
- first_unused[NISENTRYLEN (0, 0, result)] = '\0';
- serv->s_name = first_unused;
- size_t len = strlen (first_unused) + 1;
- room_left -= len;
- first_unused += len;
-
- if (NISENTRYLEN (0, 2, result) >= room_left)
- goto no_more_room;
- strncpy (first_unused, NISENTRYVAL (0, 2, result),
- NISENTRYLEN (0, 2, result));
- first_unused[NISENTRYLEN (0, 2, result)] = '\0';
- serv->s_proto = first_unused;
- len = strlen (first_unused) + 1;
- room_left -= len;
- first_unused += len;
-
- serv->s_port = htons (atoi (NISENTRYVAL (0, 3, result)));
-
- /* XXX Rewrite at some point to allocate the array first and then
- copy the strings. It wasteful to first concatenate the strings
- to just split them again later. */
- char *line = first_unused;
- for (unsigned int i = 0; i < NIS_RES_NUMOBJ (result); ++i)
- {
- if (strcmp (NISENTRYVAL (i, 1, result), serv->s_name) != 0)
- {
- if (NISENTRYLEN (i, 1, result) + 2 > room_left)
- goto no_more_room;
- *first_unused++ = ' ';
- first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result),
- NISENTRYLEN (i, 1, result));
- room_left -= NISENTRYLEN (i, 1, result) + 1;
- }
- }
- *first_unused++ = '\0';
-
- /* Adjust the pointer so it is aligned for
- storing pointers. */
- size_t adjust = ((__alignof__ (char *)
- - (first_unused - (char *) 0) % __alignof__ (char *))
- % __alignof__ (char *));
- if (room_left < adjust + sizeof (char *))
- goto no_more_room;
- first_unused += adjust;
- room_left -= adjust;
- serv->s_aliases = (char **) first_unused;
-
- /* For the terminating NULL pointer. */
- room_left -= (sizeof (char *));
-
- unsigned int i = 0;
- while (*line != '\0')
- {
- /* Skip leading blanks. */
- while (isspace (*line))
- ++line;
-
- if (*line == '\0')
- break;
-
- if (room_left < sizeof (char *))
- goto no_more_room;
-
- room_left -= sizeof (char *);
- serv->s_aliases[i++] = line;
-
- while (*line != '\0' && *line != ' ')
- ++line;
-
- if (*line == ' ')
- *line++ = '\0';
- }
- serv->s_aliases[i] = NULL;
-
- return 1;
-}
-
-
-static enum nss_status
-_nss_create_tablename (int *errnop)
-{
- if (tablename_val == NULL)
- {
- const char *local_dir = nis_local_directory ();
- size_t local_dir_len = strlen (local_dir);
- static const char prefix[] = "services.org_dir.";
-
- char *p = malloc (sizeof (prefix) + local_dir_len);
- if (p == NULL)
- {
- *errnop = errno;
- return NSS_STATUS_TRYAGAIN;
- }
-
- memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
-
- tablename_len = sizeof (prefix) - 1 + local_dir_len;
-
- atomic_write_barrier ();
-
- tablename_val = p;
- }
-
- return NSS_STATUS_SUCCESS;
-}
-
-
-enum nss_status
-_nss_nisplus_setservent (int stayopen)
-{
- enum nss_status status = NSS_STATUS_SUCCESS;
- int err;
-
- __libc_lock_lock (lock);
-
- if (result != NULL)
- {
- nis_freeresult (result);
- result = NULL;
- }
-
- if (tablename_val == NULL)
- status = _nss_create_tablename (&err);
-
- __libc_lock_unlock (lock);
-
- return status;
-}
-
-enum nss_status
-_nss_nisplus_endservent (void)
-{
- __libc_lock_lock (lock);
-
- if (result != NULL)
- {
- nis_freeresult (result);
- result = NULL;
- }
-
- __libc_lock_unlock (lock);
-
- return NSS_STATUS_SUCCESS;
-}
-
-static enum nss_status
-internal_nisplus_getservent_r (struct servent *serv, char *buffer,
- size_t buflen, int *errnop)
-{
- int parse_res;
-
- /* Get the next entry until we found a correct one. */
- do
- {
- nis_result *saved_res;
-
- if (result == NULL)
- {
- saved_res = NULL;
- if (tablename_val == NULL)
- {
- enum nss_status status = _nss_create_tablename (errnop);
-
- if (status != NSS_STATUS_SUCCESS)
- return status;
- }
-
- result = nis_first_entry (tablename_val);
- if (result == NULL)
- {
- *errnop = errno;
- return NSS_STATUS_TRYAGAIN;
- }
- if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
- return niserr2nss (result->status);
- }
- else
- {
- saved_res = result;
- result = nis_next_entry (tablename_val, &result->cookie);
- if (result == NULL)
- {
- *errnop = errno;
- return NSS_STATUS_TRYAGAIN;
- }
- if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
- {
- nis_freeresult (saved_res);
- return niserr2nss (result->status);
- }
- }
-
- parse_res = _nss_nisplus_parse_servent (result, serv, buffer,
- buflen, errnop);
- if (__glibc_unlikely (parse_res == -1))
- {
- nis_freeresult (result);
- result = saved_res;
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
- else
- {
- if (saved_res)
- nis_freeresult (saved_res);
- }
- }
- while (!parse_res);
-
- return NSS_STATUS_SUCCESS;
-}
-
-enum nss_status
-_nss_nisplus_getservent_r (struct servent *result, char *buffer,
- size_t buflen, int *errnop)
-{
- __libc_lock_lock (lock);
-
- int status = internal_nisplus_getservent_r (result, buffer, buflen, errnop);
-
- __libc_lock_unlock (lock);
-
- return status;
-}
-
-enum nss_status
-_nss_nisplus_getservbyname_r (const char *name, const char *protocol,
- struct servent *serv,
- char *buffer, size_t buflen, int *errnop)
-{
- if (tablename_val == NULL)
- {
- __libc_lock_lock (lock);
-
- enum nss_status status = _nss_create_tablename (errnop);
-
- __libc_lock_unlock (lock);
-
- if (status != NSS_STATUS_SUCCESS)
- return status;
- }
-
- if (name == NULL || protocol == NULL)
- {
- *errnop = EINVAL;
- return NSS_STATUS_NOTFOUND;
- }
-
- size_t protocol_len = strlen (protocol);
- char buf[strlen (name) + protocol_len + 17 + tablename_len];
- int olderr = errno;
-
- /* Search at first in the alias list, and use the correct name
- for the next search */
- snprintf (buf, sizeof (buf), "[name=%s,proto=%s],%s", name, protocol,
- tablename_val);
- nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
- NULL, NULL);
-
- if (result != NULL)
- {
- char *bufptr = buf;
-
- /* If we did not find it, try it as original name. But if the
- database is correct, we should find it in the first case, too */
- if ((result->status != NIS_SUCCESS
- && result->status != NIS_S_SUCCESS)
- || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
- || strcmp (NIS_RES_OBJECT (result)->EN_data.en_type,
- "services_tbl") != 0
- || NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 4)
- snprintf (buf, sizeof (buf), "[cname=%s,proto=%s],%s", name, protocol,
- tablename_val);
- else
- {
- /* We need to allocate a new buffer since there is no
- guarantee the returned name has a length limit. */
- const char *entryval = NISENTRYVAL(0, 0, result);
- size_t buflen = (strlen (entryval) + protocol_len + 17
- + tablename_len);
- bufptr = alloca (buflen);
- snprintf (bufptr, buflen, "[cname=%s,proto=%s],%s",
- entryval, protocol, tablename_val);
- }
-
- nis_freeresult (result);
- result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
- NULL, NULL);
- }
-
- if (result == NULL)
- {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
-
- if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
- {
- enum nss_status status = niserr2nss (result->status);
-
- __set_errno (olderr);
-
- nis_freeresult (result);
- return status;
- }
-
- int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
- errnop);
- nis_freeresult (result);
-
- if (__glibc_unlikely (parse_res < 1))
- {
- if (parse_res == -1)
- {
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
- else
- {
- __set_errno (olderr);
- return NSS_STATUS_NOTFOUND;
- }
- }
-
- return NSS_STATUS_SUCCESS;
-}
-
-enum nss_status
-_nss_nisplus_getservbyport_r (const int number, const char *protocol,
- struct servent *serv,
- char *buffer, size_t buflen, int *errnop)
-{
- if (tablename_val == NULL)
- {
- __libc_lock_lock (lock);
-
- enum nss_status status = _nss_create_tablename (errnop);
-
- __libc_lock_unlock (lock);
-
- if (status != NSS_STATUS_SUCCESS)
- return status;
- }
-
- if (protocol == NULL)
- {
- *errnop = EINVAL;
- return NSS_STATUS_NOTFOUND;
- }
-
- char buf[17 + 3 * sizeof (int) + strlen (protocol) + tablename_len];
- int olderr = errno;
-
- snprintf (buf, sizeof (buf), "[port=%d,proto=%s],%s",
- number, protocol, tablename_val);
-
- nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
- NULL, NULL);
-
- if (result == NULL)
- {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
-
- if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
- {
- enum nss_status status = niserr2nss (result->status);
-
- __set_errno (olderr);
-
- nis_freeresult (result);
- return status;
- }
-
- int parse_res = _nss_nisplus_parse_servent (result, serv, buffer, buflen,
- errnop);
- nis_freeresult (result);
-
- if (__glibc_unlikely (parse_res < 1))
- {
- if (parse_res == -1)
- {
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
- else
- {
- __set_errno (olderr);
- return NSS_STATUS_NOTFOUND;
- }
- }
-
- return NSS_STATUS_SUCCESS;
-}
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