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/*
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ethers.c - NSS lookup functions for ethers database
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Copyright (C) 2006 West Consulting
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Copyright (C) 2006-2015 Arthur de Jong
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Copyright (C) 2010 Symas Corporation
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This 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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This 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 this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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#include "config.h"
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#include <string.h>
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#include <errno.h>
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#include "prototypes.h"
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#include "common.h"
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#include "compat/attrs.h"
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/* read an ethernet entry from the stream */
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static nss_status_t read_etherent(TFILE *fp, struct etherent *result,
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char *buffer, size_t buflen, int *errnop)
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{
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int32_t tmpint32;
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size_t bufptr = 0;
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memset(result, 0, sizeof(struct etherent));
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READ_BUF_STRING(fp, result->e_name);
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READ(fp, &(result->e_addr), sizeof(uint8_t[6]));
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return NSS_STATUS_SUCCESS;
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}
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#ifdef NSS_FLAVOUR_GLIBC
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/* map a hostname to the corresponding ethernet address */
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nss_status_t NSS_NAME(gethostton_r)(const char *name,
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struct etherent *result, char *buffer,
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size_t buflen, int *errnop)
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{
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NSS_GETONE(NSLCD_ACTION_ETHER_BYNAME,
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WRITE_STRING(fp, name),
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read_etherent(fp, result, buffer, buflen, errnop));
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}
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/* map an ethernet address to the corresponding hostname */
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nss_status_t NSS_NAME(getntohost_r)(const struct ether_addr *addr,
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struct etherent *result, char *buffer,
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size_t buflen, int *errnop)
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{
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NSS_GETONE(NSLCD_ACTION_ETHER_BYETHER,
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WRITE(fp, addr, sizeof(uint8_t[6])),
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read_etherent(fp, result, buffer, buflen, errnop));
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}
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/* thread-local file pointer to an ongoing request */
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static TLS TFILE *etherentfp;
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/* open a connection to read all ether entries */
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nss_status_t NSS_NAME(setetherent)(int UNUSED(stayopen))
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{
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NSS_SETENT(etherentfp);
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}
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/* read a single ethernet entry from the stream */
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nss_status_t NSS_NAME(getetherent_r)(struct etherent *result,
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char *buffer, size_t buflen, int *errnop)
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{
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NSS_GETENT(etherentfp, NSLCD_ACTION_ETHER_ALL,
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read_etherent(etherentfp, result, buffer, buflen, errnop));
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}
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/* close the stream opened with setetherent() above */
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nss_status_t NSS_NAME(endetherent)(void)
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{
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NSS_ENDENT(etherentfp);
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}
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#endif /* NSS_FLAVOUR_GLIBC */
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#ifdef NSS_FLAVOUR_SOLARIS
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/* we disable NSS_BUFCHECK because these functions do not use the buffer */
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#undef NSS_BUFCHECK
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#define NSS_BUFCHECK ;
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/* provide a fallback definition */
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#ifndef NSS_BUFLEN_ETHERS
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#define NSS_BUFLEN_ETHERS HOST_NAME_MAX
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#endif /* NSS_BUFLEN_ETHERS */
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#ifdef HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN
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static char *etherent2str(struct etherent *result, char *buffer,
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size_t buflen)
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{
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int res;
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res = snprintf(buffer, buflen, "%s %s", ether_ntoa(&result->e_addr),
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result->e_name);
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if ((res < 0) || (res >= (int)buflen))
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return NULL;
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return buffer;
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}
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#endif /* HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN */
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static nss_status_t read_result(TFILE *fp, nss_XbyY_args_t *args, int wantname)
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{
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struct etherent result;
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char buffer[NSS_BUFLEN_ETHERS];
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nss_status_t retv;
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/* read the result entry from the stream */
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retv = read_etherent(fp, &result, buffer, sizeof(buffer), &args->erange);
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if (retv != NSS_STATUS_SUCCESS)
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return retv;
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#ifdef HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN
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/* try to return in string format if requested */
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if ((args->buf.buffer != NULL) && (args->buf.buflen > 0))
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{
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if (etherent2str(&result, args->buf.buffer, args->buf.buflen) == NULL)
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{
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args->erange = 1;
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return NSS_NOTFOUND;
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}
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args->returnval = args->buf.buffer;
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args->returnlen = strlen(args->returnval);
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return NSS_SUCCESS;
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}
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#endif /* HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN */
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/* return the result entry */
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if (wantname)
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{
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/* we expect the buffer to have enough room for the name (buflen == 0) */
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strcpy(args->buf.buffer, result.e_name);
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args->returnval = args->buf.buffer;
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}
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else /* address */
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{
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memcpy(args->buf.result, &result.e_addr, sizeof(result.e_addr));
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args->returnval = args->buf.result;
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}
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return NSS_SUCCESS;
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}
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/* map a hostname to the corresponding ethernet address */
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static nss_status_t ethers_gethostton(nss_backend_t UNUSED(*be), void *args)
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{
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NSS_GETONE(NSLCD_ACTION_ETHER_BYNAME,
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WRITE_STRING(fp, NSS_ARGS(args)->key.name),
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read_result(fp, args, 0));
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}
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/* map an ethernet address to the corresponding hostname */
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static nss_status_t ethers_getntohost(nss_backend_t UNUSED(*be), void *args)
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{
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struct ether_addr *addr = (struct ether_addr *)(NSS_ARGS(args)->key.ether);
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NSS_GETONE(NSLCD_ACTION_ETHER_BYETHER,
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WRITE(fp, addr, sizeof(uint8_t[6])),
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read_result(fp, args, 1));
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}
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static nss_backend_op_t ethers_ops[] = {
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nss_ldap_destructor,
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ethers_gethostton,
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ethers_getntohost
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};
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nss_backend_t *NSS_NAME(ethers_constr)(const char UNUSED(*db_name),
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const char UNUSED(*src_name),
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const char UNUSED(*cfg_args))
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{
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return nss_ldap_constructor(ethers_ops, sizeof(ethers_ops));
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}
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#endif /* NSS_FLAVOUR_SOLARIS */
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