diff options
Diffstat (limited to 'nis/nss_nisplus/nisplus-hosts.c')
| -rw-r--r-- | nis/nss_nisplus/nisplus-hosts.c | 584 |
1 files changed, 0 insertions, 584 deletions
diff --git a/nis/nss_nisplus/nisplus-hosts.c b/nis/nss_nisplus/nisplus-hosts.c deleted file mode 100644 index 1e66e4f..0000000 --- a/nis/nss_nisplus/nisplus-hosts.c +++ /dev/null @@ -1,584 +0,0 @@ -/* 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 <assert.h> -#include <atomic.h> -#include <ctype.h> -#include <errno.h> -#include <netdb.h> -#include <nss.h> -#include <string.h> -#include <arpa/inet.h> -#include <netinet/in.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_hostent (nis_result *result, int af, struct hostent *host, - char *buffer, size_t buflen, int *errnop) -{ - unsigned int i; - 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)[0].EN_data.en_type, "hosts_tbl") != 0 - || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 4) - return 0; - - char *data = first_unused; - - if (room_left < (af != AF_INET ? IN6ADDRSZ : INADDRSZ)) - { - no_more_room: - *errnop = ERANGE; - return -1; - } - - /* Parse address. */ - if (af != AF_INET6 - && inet_pton (AF_INET, NISENTRYVAL (0, 2, result), data) > 0) - { - host->h_addrtype = AF_INET; - host->h_length = INADDRSZ; - } - else if (af != AF_INET - && inet_pton (AF_INET6, NISENTRYVAL (0, 2, result), data) > 0) - { - host->h_addrtype = AF_INET6; - host->h_length = IN6ADDRSZ; - } - else - /* Illegal address: ignore line. */ - return 0; - - first_unused += host->h_length; - room_left -= host->h_length; - - if (NISENTRYLEN (0, 0, result) + 1 > room_left) - goto no_more_room; - - host->h_name = first_unused; - first_unused = __stpncpy (first_unused, NISENTRYVAL (0, 0, result), - NISENTRYLEN (0, 0, result)); - *first_unused++ = '\0'; - - room_left -= NISENTRYLEN (0, 0, result) + 1; - char *line = first_unused; - - /* When this is a call to gethostbyname4_r we do not need the aliases. */ - if (af != AF_UNSPEC) - { - /* XXX Rewrite at some point to allocate the array first and then - copy the strings. It is wasteful to first concatenate the strings - to just split them again later. */ - for (i = 0; i < NIS_RES_NUMOBJ (result); ++i) - { - if (strcmp (NISENTRYVAL (i, 1, result), host->h_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)); - *first_unused = '\0'; - 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 + 3 * sizeof (char *)) - goto no_more_room; - first_unused += adjust; - room_left -= adjust; - host->h_addr_list = (char **) first_unused; - - room_left -= 3 * sizeof (char *); - host->h_addr_list[0] = data; - host->h_addr_list[1] = NULL; - host->h_aliases = &host->h_addr_list[2]; - - /* When this is a call to gethostbyname4_r we do not need the aliases. */ - if (af != AF_UNSPEC) - { - 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 *); - host->h_aliases[i++] = line; - - while (*line != '\0' && *line != ' ') - ++line; - - if (*line == ' ') - *line++ = '\0'; - } - - host->h_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[] = "hosts.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_sethostent (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_endhostent (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_gethostent_r (struct hostent *host, char *buffer, - size_t buflen, int *errnop, int *herrnop) -{ - 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) - { - enum nss_status retval = niserr2nss (result->status); - if (retval == NSS_STATUS_TRYAGAIN) - { - *herrnop = NETDB_INTERNAL; - *errnop = errno; - } - return retval; - } - - } - 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) - { - enum nss_status retval= niserr2nss (result->status); - - nis_freeresult (result); - result = saved_res; - if (retval == NSS_STATUS_TRYAGAIN) - { - *herrnop = NETDB_INTERNAL; - *errnop = errno; - } - return retval; - } - } - - parse_res = _nss_nisplus_parse_hostent (result, AF_INET, host, buffer, - buflen, errnop); - - if (parse_res == -1) - { - nis_freeresult (result); - result = saved_res; - *herrnop = NETDB_INTERNAL; - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } - if (saved_res != NULL) - nis_freeresult (saved_res); - - } while (!parse_res); - - return NSS_STATUS_SUCCESS; -} - - -enum nss_status -_nss_nisplus_gethostent_r (struct hostent *result, char *buffer, - size_t buflen, int *errnop, int *herrnop) -{ - int status; - - __libc_lock_lock (lock); - - status = internal_nisplus_gethostent_r (result, buffer, buflen, errnop, - herrnop); - - __libc_lock_unlock (lock); - - return status; -} - - -static enum nss_status -get_tablename (int *herrnop) -{ - __libc_lock_lock (lock); - - enum nss_status status = _nss_create_tablename (herrnop); - - __libc_lock_unlock (lock); - - if (status != NSS_STATUS_SUCCESS) - *herrnop = NETDB_INTERNAL; - - return status; -} - - -static enum nss_status -internal_gethostbyname2_r (const char *name, int af, struct hostent *host, - char *buffer, size_t buflen, int *errnop, - int *herrnop) -{ - if (tablename_val == NULL) - { - enum nss_status status = get_tablename (herrnop); - if (status != NSS_STATUS_SUCCESS) - return status; - } - - if (name == NULL) - { - *errnop = EINVAL; - *herrnop = NETDB_INTERNAL; - return NSS_STATUS_NOTFOUND; - } - - char buf[strlen (name) + 10 + 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],%s", name, tablename_val); - nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); - - if (result != NULL) - { - /* 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. */ - char *bufptr = buf; - size_t buflen = sizeof (buf); - - if ((result->status == NIS_SUCCESS || result->status == NIS_S_SUCCESS) - && __type_of (result->objects.objects_val) == NIS_ENTRY_OBJ - && strcmp (result->objects.objects_val->EN_data.en_type, - "hosts_tbl") == 0 - && result->objects.objects_val->EN_data.en_cols.en_cols_len >= 3) - { - /* We need to allocate a new buffer since there is no - guarantee the returned alias name has a length limit. */ - name = NISENTRYVAL(0, 0, result); - size_t buflen = strlen (name) + 10 + tablename_len; - bufptr = alloca (buflen); - } - - snprintf (bufptr, buflen, "[cname=%s],%s", name, tablename_val); - - nis_freeresult (result); - result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); - } - - if (result == NULL) - { - *errnop = ENOMEM; - *herrnop = NETDB_INTERNAL; - return NSS_STATUS_TRYAGAIN; - } - - int retval = niserr2nss (result->status); - if (__glibc_unlikely (retval != NSS_STATUS_SUCCESS)) - { - if (retval == NSS_STATUS_TRYAGAIN) - { - *errnop = errno; - *herrnop = TRY_AGAIN; - } - else - { - __set_errno (olderr); - *herrnop = NETDB_INTERNAL; - } - nis_freeresult (result); - return retval; - } - - int parse_res = _nss_nisplus_parse_hostent (result, af, host, buffer, - buflen, errnop); - - nis_freeresult (result); - - if (parse_res > 0) - return NSS_STATUS_SUCCESS; - - *herrnop = NETDB_INTERNAL; - if (parse_res == -1) - { - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } - - __set_errno (olderr); - return NSS_STATUS_NOTFOUND; -} - - -enum nss_status -_nss_nisplus_gethostbyname2_r (const char *name, int af, struct hostent *host, - char *buffer, size_t buflen, int *errnop, - int *herrnop) -{ - if (af != AF_INET && af != AF_INET6) - { - *herrnop = HOST_NOT_FOUND; - return NSS_STATUS_NOTFOUND; - } - - return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop, - herrnop); -} - - -enum nss_status -_nss_nisplus_gethostbyname_r (const char *name, struct hostent *host, - char *buffer, size_t buflen, int *errnop, - int *h_errnop) -{ - return internal_gethostbyname2_r (name, AF_INET, host, buffer, - buflen, errnop, h_errnop); -} - - -enum nss_status -_nss_nisplus_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af, - struct hostent *host, char *buffer, - size_t buflen, int *errnop, int *herrnop) -{ - if (tablename_val == NULL) - { - enum nss_status status = get_tablename (herrnop); - if (status != NSS_STATUS_SUCCESS) - return status; - } - - if (addr == NULL) - return NSS_STATUS_NOTFOUND; - - char buf[24 + tablename_len]; - int retval, parse_res; - int olderr = errno; - - snprintf (buf, sizeof (buf), "[addr=%s],%s", - inet_ntoa (*(const struct in_addr *) addr), tablename_val); - nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL); - - if (result == NULL) - { - __set_errno (ENOMEM); - return NSS_STATUS_TRYAGAIN; - } - - retval = niserr2nss (result->status); - if (__glibc_unlikely (retval != NSS_STATUS_SUCCESS)) - { - if (retval == NSS_STATUS_TRYAGAIN) - { - *errnop = errno; - *herrnop = NETDB_INTERNAL; - } - else - __set_errno (olderr); - nis_freeresult (result); - return retval; - } - - parse_res = _nss_nisplus_parse_hostent (result, af, host, - buffer, buflen, errnop); - nis_freeresult (result); - - if (parse_res > 0) - return NSS_STATUS_SUCCESS; - - *herrnop = NETDB_INTERNAL; - if (parse_res == -1) - { - *errnop = ERANGE; - return NSS_STATUS_TRYAGAIN; - } - - __set_errno (olderr); - return NSS_STATUS_NOTFOUND; -} - - -enum nss_status -_nss_nisplus_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat, - char *buffer, size_t buflen, int *errnop, - int *herrnop, int32_t *ttlp) -{ - struct hostent host; - - enum nss_status status = internal_gethostbyname2_r (name, AF_UNSPEC, &host, - buffer, buflen, - errnop, herrnop); - if (__glibc_likely (status == NSS_STATUS_SUCCESS)) - { - if (*pat == NULL) - { - uintptr_t pad = (-(uintptr_t) buffer - % __alignof__ (struct gaih_addrtuple)); - buffer += pad; - buflen = buflen > pad ? buflen - pad : 0; - - if (__glibc_unlikely (buflen < sizeof (struct gaih_addrtuple))) - { - free (result); - *errnop = ERANGE; - *herrnop = NETDB_INTERNAL; - return NSS_STATUS_TRYAGAIN; - } - } - - (*pat)->next = NULL; - (*pat)->name = host.h_name; - (*pat)->family = host.h_addrtype; - - memcpy ((*pat)->addr, host.h_addr_list[0], host.h_length); - (*pat)->scopeid = 0; - assert (host.h_addr_list[1] == NULL); - } - - return status; -} |