+++ /dev/null
-/* Copyright (C) 1996-2020 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
-
- 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 <nss.h>
-#include <ctype.h>
-#include <netdb.h>
-#include <string.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <libc-lock.h>
-#include <rpcsvc/yp.h>
-#include <rpcsvc/ypclnt.h>
-
-#include "nss-nis.h"
-
-#define ENTNAME hostent
-#define DATABASE "hosts"
-#define NEED_H_ERRNO
-
-#define EXTRA_ARGS , af
-#define EXTRA_ARGS_DECL , int af
-
-#define ENTDATA hostent_data
-struct hostent_data
- {
- unsigned char host_addr[16]; /* IPv4 or IPv6 address. */
- char *h_addr_ptrs[2]; /* Points to that and null terminator. */
- };
-
-#define TRAILING_LIST_MEMBER h_aliases
-#define TRAILING_LIST_SEPARATOR_P isspace
-#include <nss/nss_files/files-parse.c>
-LINE_PARSER
-("#",
- {
- char *addr;
-
- STRING_FIELD (addr, isspace, 1);
-
- assert (af == AF_INET || af == AF_INET6 || af == AF_UNSPEC);
-
- /* Parse address. */
- if (af != AF_INET6 && inet_pton (AF_INET, addr, entdata->host_addr) > 0)
- {
- result->h_addrtype = AF_INET;
- result->h_length = INADDRSZ;
- }
- else if (af != AF_INET
- && inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
- {
- result->h_addrtype = AF_INET6;
- result->h_length = IN6ADDRSZ;
- }
- else
- /* Illegal address: ignore line. */
- return 0;
-
- /* Store a pointer to the address in the expected form. */
- entdata->h_addr_ptrs[0] = (char *) entdata->host_addr;
- entdata->h_addr_ptrs[1] = NULL;
- result->h_addr_list = entdata->h_addr_ptrs;
-
- STRING_FIELD (result->h_name, isspace, 1);
- })
-
-
-__libc_lock_define_initialized (static, lock)
-
-static bool_t new_start = 1;
-static char *oldkey = NULL;
-static int oldkeylen = 0;
-
-enum nss_status
-_nss_nis_sethostent (int stayopen)
-{
- return _nss_nis_endhostent ();
-}
-
-enum nss_status
-_nss_nis_endhostent (void)
-{
- __libc_lock_lock (lock);
-
- new_start = 1;
- if (oldkey != NULL)
- {
- free (oldkey);
- oldkey = NULL;
- oldkeylen = 0;
- }
-
- __libc_lock_unlock (lock);
-
- return NSS_STATUS_SUCCESS;
-}
-libnss_nis_hidden_def (_nss_nis_endhostent)
-
-/* The calling function always need to get a lock first. */
-static enum nss_status
-internal_nis_gethostent_r (struct hostent *host, char *buffer,
- size_t buflen, int *errnop, int *h_errnop,
- int af)
-{
- char *domain;
- if (__glibc_unlikely (yp_get_default_domain (&domain)))
- return NSS_STATUS_UNAVAIL;
-
- uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data);
- buffer += pad;
-
- struct parser_data *data = (void *) buffer;
- if (__glibc_unlikely (buflen < sizeof *data + 1 + pad))
- {
- *errnop = ERANGE;
- *h_errnop = NETDB_INTERNAL;
- return NSS_STATUS_TRYAGAIN;
- }
- buflen -= pad;
-
- /* Get the next entry until we found a correct one. */
- const size_t linebuflen = buffer + buflen - data->linebuffer;
- int parse_res;
- do
- {
- char *result;
- int len;
- char *outkey;
- int keylen;
- int yperr;
- if (new_start)
- yperr = yp_first (domain, "hosts.byname", &outkey, &keylen, &result,
- &len);
- else
- yperr = yp_next (domain, "hosts.byname", oldkey, oldkeylen, &outkey,
- &keylen, &result, &len);
-
- if (__glibc_unlikely (yperr != YPERR_SUCCESS))
- {
- enum nss_status retval = yperr2nss (yperr);
-
- switch (retval)
- {
- case NSS_STATUS_TRYAGAIN:
- *errnop = errno;
- *h_errnop = TRY_AGAIN;
- break;
- case NSS_STATUS_NOTFOUND:
- *h_errnop = HOST_NOT_FOUND;
- break;
- default:
- *h_errnop = NO_RECOVERY;
- break;
- }
- return retval;
- }
-
- if (__glibc_unlikely ((size_t) (len + 1) > linebuflen))
- {
- free (result);
- *h_errnop = NETDB_INTERNAL;
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
-
- char *p = strncpy (data->linebuffer, result, len);
- data->linebuffer[len] = '\0';
- while (isspace (*p))
- ++p;
- free (result);
-
- parse_res = parse_line (p, host, data, buflen, errnop, af);
- if (__glibc_unlikely (parse_res == -1))
- {
- free (outkey);
- *h_errnop = NETDB_INTERNAL;
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
- free (oldkey);
- oldkey = outkey;
- oldkeylen = keylen;
- new_start = 0;
- }
- while (!parse_res);
-
- *h_errnop = NETDB_SUCCESS;
- return NSS_STATUS_SUCCESS;
-}
-
-
-enum nss_status
-_nss_nis_gethostent_r (struct hostent *host, char *buffer, size_t buflen,
- int *errnop, int *h_errnop)
-{
- enum nss_status status;
-
- __libc_lock_lock (lock);
-
- status = internal_nis_gethostent_r (host, buffer, buflen, errnop, h_errnop,
- AF_INET);
-
- __libc_lock_unlock (lock);
-
- 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 *h_errnop)
-{
- uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data);
- buffer += pad;
-
- struct parser_data *data = (void *) buffer;
-
- if (name == NULL)
- {
- *errnop = EINVAL;
- return NSS_STATUS_UNAVAIL;
- }
-
- char *domain;
- if (yp_get_default_domain (&domain))
- return NSS_STATUS_UNAVAIL;
-
- if (buflen < sizeof *data + 1 + pad)
- {
- *h_errnop = NETDB_INTERNAL;
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
- buflen -= pad;
-
- /* Convert name to lowercase. */
- size_t namlen = strlen (name);
- /* Limit name length to the maximum size of an RPC packet. */
- if (namlen > UDPMSGSIZE)
- {
- *errnop = ERANGE;
- return NSS_STATUS_UNAVAIL;
- }
-
- char name2[namlen + 1];
- size_t i;
-
- for (i = 0; i < namlen; ++i)
- name2[i] = tolower (name[i]);
- name2[i] = '\0';
-
- char *result;
- int len;
- int yperr = yp_match (domain, "hosts.byname", name2, namlen, &result, &len);
-
- if (__glibc_unlikely (yperr != YPERR_SUCCESS))
- {
- enum nss_status retval = yperr2nss (yperr);
-
- if (retval == NSS_STATUS_TRYAGAIN)
- {
- *h_errnop = TRY_AGAIN;
- *errnop = errno;
- }
- if (retval == NSS_STATUS_NOTFOUND)
- *h_errnop = HOST_NOT_FOUND;
- return retval;
- }
-
- const size_t linebuflen = buffer + buflen - data->linebuffer;
- if (__glibc_unlikely ((size_t) (len + 1) > linebuflen))
- {
- free (result);
- *h_errnop = NETDB_INTERNAL;
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
-
- char *p = strncpy (data->linebuffer, result, len);
- data->linebuffer[len] = '\0';
- while (isspace (*p))
- ++p;
- free (result);
-
- int parse_res = parse_line (p, host, data, buflen, errnop, af);
-
- if (__glibc_unlikely (parse_res < 1 || host->h_addrtype != af))
- {
- if (parse_res == -1)
- {
- *h_errnop = NETDB_INTERNAL;
- return NSS_STATUS_TRYAGAIN;
- }
- else
- {
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
- }
-
- *h_errnop = NETDB_SUCCESS;
- return NSS_STATUS_SUCCESS;
-}
-
-
-enum nss_status
-_nss_nis_gethostbyname2_r (const char *name, int af, struct hostent *host,
- char *buffer, size_t buflen, int *errnop,
- int *h_errnop)
-{
- if (af != AF_INET && af != AF_INET6)
- {
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
-
- return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop,
- h_errnop);
-}
-
-
-enum nss_status
-_nss_nis_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_nis_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
- struct hostent *host, char *buffer, size_t buflen,
- int *errnop, int *h_errnop)
-{
- char *domain;
- if (__glibc_unlikely (yp_get_default_domain (&domain)))
- return NSS_STATUS_UNAVAIL;
-
- uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data);
- buffer += pad;
-
- struct parser_data *data = (void *) buffer;
- if (__glibc_unlikely (buflen < sizeof *data + 1 + pad))
- {
- *errnop = ERANGE;
- *h_errnop = NETDB_INTERNAL;
- return NSS_STATUS_TRYAGAIN;
- }
- buflen -= pad;
-
- char *buf = inet_ntoa (*(const struct in_addr *) addr);
-
- char *result;
- int len;
- int yperr = yp_match (domain, "hosts.byaddr", buf, strlen (buf), &result,
- &len);
-
- if (__glibc_unlikely (yperr != YPERR_SUCCESS))
- {
- enum nss_status retval = yperr2nss (yperr);
-
- if (retval == NSS_STATUS_TRYAGAIN)
- {
- *h_errnop = TRY_AGAIN;
- *errnop = errno;
- }
- else if (retval == NSS_STATUS_NOTFOUND)
- *h_errnop = HOST_NOT_FOUND;
-
- return retval;
- }
-
- const size_t linebuflen = buffer + buflen - data->linebuffer;
- if (__glibc_unlikely ((size_t) (len + 1) > linebuflen))
- {
- free (result);
- *errnop = ERANGE;
- *h_errnop = NETDB_INTERNAL;
- return NSS_STATUS_TRYAGAIN;
- }
-
- char *p = strncpy (data->linebuffer, result, len);
- data->linebuffer[len] = '\0';
- while (isspace (*p))
- ++p;
- free (result);
-
- int parse_res = parse_line (p, host, data, buflen, errnop, af);
- if (__glibc_unlikely (parse_res < 1))
- {
- if (parse_res == -1)
- {
- *h_errnop = NETDB_INTERNAL;
- return NSS_STATUS_TRYAGAIN;
- }
- else
- {
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
- }
-
- *h_errnop = NETDB_SUCCESS;
- return NSS_STATUS_SUCCESS;
-}
-
-
-enum nss_status
-_nss_nis_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
- char *buffer, size_t buflen, int *errnop,
- int *herrnop, int32_t *ttlp)
-{
- char *domain;
- if (yp_get_default_domain (&domain))
- {
- *herrnop = NO_DATA;
- return NSS_STATUS_UNAVAIL;
- }
-
- /* Convert name to lowercase. */
- size_t namlen = strlen (name);
- /* Limit name length to the maximum size of an RPC packet. */
- if (namlen > UDPMSGSIZE)
- {
- *errnop = ERANGE;
- return NSS_STATUS_UNAVAIL;
- }
-
- char name2[namlen + 1];
- size_t i;
-
- for (i = 0; i < namlen; ++i)
- name2[i] = tolower (name[i]);
- name2[i] = '\0';
-
- char *result;
- int len;
- int yperr = yp_match (domain, "hosts.byname", name2, namlen, &result, &len);
-
- if (__glibc_unlikely (yperr != YPERR_SUCCESS))
- {
- enum nss_status retval = yperr2nss (yperr);
-
- if (retval == NSS_STATUS_TRYAGAIN)
- {
- *herrnop = TRY_AGAIN;
- *errnop = errno;
- }
- if (retval == NSS_STATUS_NOTFOUND)
- *herrnop = HOST_NOT_FOUND;
- return retval;
- }
-
- 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)))
- {
- erange:
- free (result);
- *errnop = ERANGE;
- *herrnop = NETDB_INTERNAL;
- return NSS_STATUS_TRYAGAIN;
- }
-
- *pat = (struct gaih_addrtuple *) buffer;
- buffer += sizeof (struct gaih_addrtuple);
- buflen -= sizeof (struct gaih_addrtuple);
- }
-
- uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data);
- buffer += pad;
-
- struct parser_data *data = (void *) buffer;
-
- if (__glibc_unlikely (buflen < sizeof *data + 1 + pad))
- goto erange;
- buflen -= pad;
-
- struct hostent host;
- int parse_res = parse_line (result, &host, data, buflen, errnop, AF_UNSPEC);
- if (__glibc_unlikely (parse_res < 1))
- {
- if (parse_res == -1)
- {
- *herrnop = NETDB_INTERNAL;
- return NSS_STATUS_TRYAGAIN;
- }
- else
- {
- *herrnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
- }
-
- (*pat)->next = NULL;
- (*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);
-
- /* Undo the alignment for parser_data. */
- buffer -= pad;
- buflen += pad;
-
- size_t h_name_len = strlen (host.h_name) + 1;
- if (h_name_len >= buflen)
- goto erange;
- (*pat)->name = memcpy (buffer, host.h_name, h_name_len);
-
- free (result);
-
- return NSS_STATUS_SUCCESS;
-}
projects / thirdparty / glibc.git / blobdiff