glibc/nis/nss_nis/nis-ethers.c

293 lines
6.4 KiB
C

/* 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 <nss.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <libc-lock.h>
#include <rpcsvc/yp.h>
#include <rpcsvc/ypclnt.h>
#include <netinet/ether.h>
#include <netinet/if_ether.h>
#include "nss-nis.h"
/* Protect global state against multiple changers */
__libc_lock_define_initialized (static, lock)
/* Get the declaration of the parser function. */
#define ENTNAME etherent
#define STRUCTURE etherent
#define EXTERN_PARSER
#include <nss/nss_files/files-parse.c>
struct response
{
struct response *next;
char val[0];
};
static struct response *start;
static struct response *next;
static int
saveit (int instatus, char *inkey, int inkeylen, char *inval,
int invallen, char *indata)
{
if (instatus != YP_TRUE)
return 1;
if (inkey && inkeylen > 0 && inval && invallen > 0)
{
struct response *newp = malloc (sizeof (struct response) + invallen + 1);
if (newp == NULL)
return 1; /* We have no error code for out of memory */
if (start == NULL)
start = newp;
else
next->next = newp;
next = newp;
newp->next = NULL;
*((char *) mempcpy (newp->val, inval, invallen)) = '\0';
}
return 0;
}
static void
internal_nis_endetherent (void)
{
while (start != NULL)
{
next = start;
start = start->next;
free (next);
}
}
enum nss_status
_nss_nis_endetherent (void)
{
__libc_lock_lock (lock);
internal_nis_endetherent ();
next = NULL;
__libc_lock_unlock (lock);
return NSS_STATUS_SUCCESS;
}
static enum nss_status
internal_nis_setetherent (void)
{
char *domainname;
struct ypall_callback ypcb;
enum nss_status status;
yp_get_default_domain (&domainname);
internal_nis_endetherent ();
ypcb.foreach = saveit;
ypcb.data = NULL;
status = yperr2nss (yp_all (domainname, "ethers.byname", &ypcb));
next = start;
return status;
}
enum nss_status
_nss_nis_setetherent (int stayopen)
{
enum nss_status result;
__libc_lock_lock (lock);
result = internal_nis_setetherent ();
__libc_lock_unlock (lock);
return result;
}
static enum nss_status
internal_nis_getetherent_r (struct etherent *eth, char *buffer, size_t buflen,
int *errnop)
{
struct parser_data *data = (void *) buffer;
int parse_res;
if (start == NULL)
internal_nis_setetherent ();
/* Get the next entry until we found a correct one. */
do
{
char *p;
if (next == NULL)
return NSS_STATUS_NOTFOUND;
p = strncpy (buffer, next->val, buflen);
while (isspace (*p))
++p;
parse_res = _nss_files_parse_etherent (p, eth, data, buflen, errnop);
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
next = next->next;
}
while (!parse_res);
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getetherent_r (struct etherent *result, char *buffer, size_t buflen,
int *errnop)
{
int status;
__libc_lock_lock (lock);
status = internal_nis_getetherent_r (result, buffer, buflen, errnop);
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nis_gethostton_r (const char *name, struct etherent *eth,
char *buffer, size_t buflen, int *errnop)
{
if (name == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
char *domain;
if (__glibc_unlikely (yp_get_default_domain (&domain)))
return NSS_STATUS_UNAVAIL;
char *result;
int len;
int yperr = yp_match (domain, "ethers.byname", name, strlen (name), &result,
&len);
if (__glibc_unlikely (yperr != YPERR_SUCCESS))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
if (__glibc_unlikely ((size_t) (len + 1) > buflen))
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
char *p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
int parse_res = _nss_files_parse_etherent (p, eth, (void *) buffer, buflen,
errnop);
if (__glibc_unlikely (parse_res < 1))
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nis_getntohost_r (const struct ether_addr *addr, struct etherent *eth,
char *buffer, size_t buflen, int *errnop)
{
if (addr == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
char *domain;
if (__glibc_unlikely (yp_get_default_domain (&domain)))
return NSS_STATUS_UNAVAIL;
char buf[33];
int nlen = snprintf (buf, sizeof (buf), "%x:%x:%x:%x:%x:%x",
(int) addr->ether_addr_octet[0],
(int) addr->ether_addr_octet[1],
(int) addr->ether_addr_octet[2],
(int) addr->ether_addr_octet[3],
(int) addr->ether_addr_octet[4],
(int) addr->ether_addr_octet[5]);
char *result;
int len;
int yperr = yp_match (domain, "ethers.byaddr", buf, nlen, &result, &len);
if (__glibc_unlikely (yperr != YPERR_SUCCESS))
{
enum nss_status retval = yperr2nss (yperr);
if (retval == NSS_STATUS_TRYAGAIN)
*errnop = errno;
return retval;
}
if (__glibc_unlikely ((size_t) (len + 1) > buflen))
{
free (result);
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
char *p = strncpy (buffer, result, len);
buffer[len] = '\0';
while (isspace (*p))
++p;
free (result);
int parse_res = _nss_files_parse_etherent (p, eth, (void *) buffer, buflen,
errnop);
if (__glibc_unlikely (parse_res < 1))
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
else
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}