443 lines
11 KiB
C
443 lines
11 KiB
C
/* Copyright (C) 1996-2000, 2002, 2003, 2006, 2007 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <nss.h>
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#include <ctype.h>
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/* The following is an ugly trick to avoid a prototype declaration for
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_nss_nis_endgrent. */
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#define _nss_nis_endhostent _nss_nis_endhostent_XXX
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#include <netdb.h>
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#undef _nss_nis_endhostent
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#include <string.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <resolv.h>
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#include <bits/libc-lock.h>
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#include <rpcsvc/yp.h>
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#include <rpcsvc/ypclnt.h>
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#include "nss-nis.h"
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/* Get implementation for some internal functions. */
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#include <resolv/mapv4v6addr.h>
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#define ENTNAME hostent
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#define DATABASE "hosts"
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#define NEED_H_ERRNO
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#define EXTRA_ARGS , af, flags
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#define EXTRA_ARGS_DECL , int af, int flags
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#define ENTDATA hostent_data
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struct hostent_data
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{
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unsigned char host_addr[16]; /* IPv4 or IPv6 address. */
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char *h_addr_ptrs[2]; /* Points to that and null terminator. */
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};
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#define TRAILING_LIST_MEMBER h_aliases
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#define TRAILING_LIST_SEPARATOR_P isspace
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#include <nss/nss_files/files-parse.c>
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LINE_PARSER
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("#",
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{
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char *addr;
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STRING_FIELD (addr, isspace, 1);
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/* Parse address. */
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if (af == AF_INET && inet_pton (AF_INET, addr, entdata->host_addr) > 0)
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{
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if (flags & AI_V4MAPPED)
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{
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map_v4v6_address ((char *) entdata->host_addr,
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(char *) entdata->host_addr);
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result->h_addrtype = AF_INET6;
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result->h_length = IN6ADDRSZ;
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}
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else
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{
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result->h_addrtype = AF_INET;
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result->h_length = INADDRSZ;
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}
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}
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else if (af == AF_INET6
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&& inet_pton (AF_INET6, addr, entdata->host_addr) > 0)
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{
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result->h_addrtype = AF_INET6;
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result->h_length = IN6ADDRSZ;
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}
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else
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/* Illegal address: ignore line. */
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return 0;
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/* Store a pointer to the address in the expected form. */
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entdata->h_addr_ptrs[0] = entdata->host_addr;
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entdata->h_addr_ptrs[1] = NULL;
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result->h_addr_list = entdata->h_addr_ptrs;
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STRING_FIELD (result->h_name, isspace, 1);
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})
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__libc_lock_define_initialized (static, lock)
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static bool_t new_start = 1;
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static char *oldkey = NULL;
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static int oldkeylen = 0;
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enum nss_status
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_nss_nis_sethostent (int stayopen)
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{
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__libc_lock_lock (lock);
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new_start = 1;
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if (oldkey != NULL)
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{
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free (oldkey);
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oldkey = NULL;
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oldkeylen = 0;
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}
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__libc_lock_unlock (lock);
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return NSS_STATUS_SUCCESS;
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}
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/* Make _nss_nis_endhostent an alias of _nss_nis_sethostent. We do this
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even though the prototypes don't match. The argument of sethostent
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is used so this makes no difference. */
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strong_alias (_nss_nis_sethostent, _nss_nis_endhostent)
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/* The calling function always need to get a lock first. */
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static enum nss_status
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internal_nis_gethostent_r (struct hostent *host, char *buffer,
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size_t buflen, int *errnop, int *h_errnop,
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int af, int flags)
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{
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char *domain;
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if (__builtin_expect (yp_get_default_domain (&domain), 0))
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return NSS_STATUS_UNAVAIL;
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uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data);
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buffer += pad;
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struct parser_data *data = (void *) buffer;
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if (__builtin_expect (buflen < sizeof *data + 1 + pad, 0))
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{
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*errnop = ERANGE;
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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buflen -= pad;
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/* Get the next entry until we found a correct one. */
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const size_t linebuflen = buffer + buflen - data->linebuffer;
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int parse_res;
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do
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{
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char *result;
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int len;
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char *outkey;
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int keylen;
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int yperr;
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if (new_start)
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yperr = yp_first (domain, "hosts.byname", &outkey, &keylen, &result,
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&len);
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else
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yperr = yp_next (domain, "hosts.byname", oldkey, oldkeylen, &outkey,
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&keylen, &result, &len);
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if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
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{
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enum nss_status retval = yperr2nss (yperr);
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switch (retval)
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{
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case NSS_STATUS_TRYAGAIN:
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*errnop = errno;
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*h_errnop = TRY_AGAIN;
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break;
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case NSS_STATUS_NOTFOUND:
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*h_errnop = HOST_NOT_FOUND;
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break;
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default:
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*h_errnop = NO_RECOVERY;
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break;
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}
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return retval;
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}
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if (__builtin_expect ((size_t) (len + 1) > linebuflen, 0))
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{
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free (result);
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*h_errnop = NETDB_INTERNAL;
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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char *p = strncpy (data->linebuffer, result, len);
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data->linebuffer[len] = '\0';
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while (isspace (*p))
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++p;
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free (result);
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parse_res = parse_line (p, host, data, buflen, errnop, af, flags);
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if (__builtin_expect (parse_res == -1, 0))
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{
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free (outkey);
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*h_errnop = NETDB_INTERNAL;
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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free (oldkey);
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oldkey = outkey;
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oldkeylen = keylen;
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new_start = 0;
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}
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while (!parse_res);
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*h_errnop = NETDB_SUCCESS;
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nis_gethostent_r (struct hostent *host, char *buffer, size_t buflen,
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int *errnop, int *h_errnop)
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{
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enum nss_status status;
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__libc_lock_lock (lock);
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status = internal_nis_gethostent_r (host, buffer, buflen, errnop, h_errnop,
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((_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET),
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((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0 ));
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__libc_lock_unlock (lock);
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return status;
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}
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static enum nss_status
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internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
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char *buffer, size_t buflen, int *errnop,
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int *h_errnop, int flags)
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{
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uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data);
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buffer += pad;
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struct parser_data *data = (void *) buffer;
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if (name == NULL)
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{
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*errnop = EINVAL;
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return NSS_STATUS_UNAVAIL;
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}
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char *domain;
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if (yp_get_default_domain (&domain))
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return NSS_STATUS_UNAVAIL;
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if (buflen < sizeof *data + 1 + pad)
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{
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*h_errnop = NETDB_INTERNAL;
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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buflen -= pad;
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/* Convert name to lowercase. */
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size_t namlen = strlen (name);
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char name2[namlen + 1];
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size_t i;
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for (i = 0; i < namlen; ++i)
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name2[i] = tolower (name[i]);
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name2[i] = '\0';
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char *result;
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int len;
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int yperr = yp_match (domain, "hosts.byname", name2, namlen, &result, &len);
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if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
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{
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enum nss_status retval = yperr2nss (yperr);
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if (retval == NSS_STATUS_TRYAGAIN)
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{
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*h_errnop = TRY_AGAIN;
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*errnop = errno;
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}
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if (retval == NSS_STATUS_NOTFOUND)
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*h_errnop = HOST_NOT_FOUND;
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return retval;
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}
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const size_t linebuflen = buffer + buflen - data->linebuffer;
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if (__builtin_expect ((size_t) (len + 1) > linebuflen, 0))
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{
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free (result);
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*h_errnop = NETDB_INTERNAL;
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*errnop = ERANGE;
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return NSS_STATUS_TRYAGAIN;
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}
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char *p = strncpy (data->linebuffer, result, len);
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data->linebuffer[len] = '\0';
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while (isspace (*p))
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++p;
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free (result);
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int parse_res = parse_line (p, host, data, buflen, errnop, af, flags);
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if (__builtin_expect (parse_res < 1 || host->h_addrtype != af, 0))
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{
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if (parse_res == -1)
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{
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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else
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{
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*h_errnop = HOST_NOT_FOUND;
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return NSS_STATUS_NOTFOUND;
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}
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}
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*h_errnop = NETDB_SUCCESS;
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nis_gethostbyname2_r (const char *name, int af, struct hostent *host,
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char *buffer, size_t buflen, int *errnop,
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int *h_errnop)
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{
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return internal_gethostbyname2_r (name, af, host, buffer, buflen, errnop,
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h_errnop,
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((_res.options & RES_USE_INET6) ? AI_V4MAPPED : 0));
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}
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enum nss_status
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_nss_nis_gethostbyname_r (const char *name, struct hostent *host, char *buffer,
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size_t buflen, int *errnop, int *h_errnop)
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{
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if (_res.options & RES_USE_INET6)
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{
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enum nss_status status;
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status = internal_gethostbyname2_r (name, AF_INET6, host, buffer, buflen,
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errnop, h_errnop, AI_V4MAPPED);
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if (status == NSS_STATUS_SUCCESS)
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return status;
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}
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return internal_gethostbyname2_r (name, AF_INET, host, buffer, buflen,
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errnop, h_errnop, 0);
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}
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enum nss_status
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_nss_nis_gethostbyaddr_r (const void *addr, socklen_t addrlen, int af,
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struct hostent *host, char *buffer, size_t buflen,
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int *errnop, int *h_errnop)
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{
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char *domain;
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if (__builtin_expect (yp_get_default_domain (&domain), 0))
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return NSS_STATUS_UNAVAIL;
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uintptr_t pad = -(uintptr_t) buffer % __alignof__ (struct parser_data);
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buffer += pad;
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struct parser_data *data = (void *) buffer;
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if (__builtin_expect (buflen < sizeof *data + 1 + pad, 0))
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{
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*errnop = ERANGE;
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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buflen -= pad;
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char *buf = inet_ntoa (*(const struct in_addr *) addr);
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char *result;
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int len;
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int yperr = yp_match (domain, "hosts.byaddr", buf, strlen (buf), &result,
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&len);
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if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
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{
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enum nss_status retval = yperr2nss (yperr);
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if (retval == NSS_STATUS_TRYAGAIN)
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{
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*h_errnop = TRY_AGAIN;
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*errnop = errno;
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}
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else if (retval == NSS_STATUS_NOTFOUND)
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*h_errnop = HOST_NOT_FOUND;
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return retval;
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}
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const size_t linebuflen = buffer + buflen - data->linebuffer;
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if (__builtin_expect ((size_t) (len + 1) > linebuflen, 0))
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{
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free (result);
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*errnop = ERANGE;
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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char *p = strncpy (data->linebuffer, result, len);
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data->linebuffer[len] = '\0';
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while (isspace (*p))
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++p;
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free (result);
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int parse_res = parse_line (p, host, data, buflen, errnop, af,
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((_res.options & RES_USE_INET6)
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? AI_V4MAPPED : 0));
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if (__builtin_expect (parse_res < 1, 0))
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{
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if (parse_res == -1)
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{
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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else
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{
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*h_errnop = HOST_NOT_FOUND;
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return NSS_STATUS_NOTFOUND;
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}
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}
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*h_errnop = NETDB_SUCCESS;
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return NSS_STATUS_SUCCESS;
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}
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#if 0
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enum nss_status
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_nss_nis_getipnodebyname_r (const char *name, int af, int flags,
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struct hostent *result, char *buffer,
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size_t buflen, int *errnop, int *herrnop)
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{
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return internal_gethostbyname2_r (name, af, result, buffer, buflen,
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errnop, herrnop, flags);
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}
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#endif
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