nis/nss_nis/nis-ethers.c

   1 /* Copyright (C) 1996-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <nss.h>
  20 #include <ctype.h>
  21 #include <errno.h>
  22 #include <string.h>
  23 #include <libc-lock.h>
  24 #include <rpcsvc/yp.h>
  25 #include <rpcsvc/ypclnt.h>
  26 #include <netinet/ether.h>
  27 #include <netinet/if_ether.h>
  28
  29 #include "nss-nis.h"
  30
  31 /* Protect global state against multiple changers */
  32 __libc_lock_define_initialized (static, lock)
  33
  34 /* Get the declaration of the parser function.  */
  35 #define ENTNAME etherent
  36 #define STRUCTURE etherent
  37 #define EXTERN_PARSER
  38 #include <nss/nss_files/files-parse.c>
  39
  40 struct response
  41 {
  42   struct response *next;
  43   char val[0];
  44 };
  45
  46 static struct response *start;
  47 static struct response *next;
  48
  49 static int
  50 saveit (int instatus, char *inkey, int inkeylen, char *inval,
  51         int invallen, char *indata)
  52 {
  53   if (instatus != YP_TRUE)
  54     return 1;
  55
  56   if (inkey && inkeylen > 0 && inval && invallen > 0)
  57     {
  58       struct response *newp = malloc (sizeof (struct response) + invallen + 1);
  59       if (newp == NULL)
  60         return 1; /* We have no error code for out of memory */
  61
  62       if (start == NULL)
  63         start = newp;
  64       else
  65         next->next = newp;
  66       next = newp;
  67
  68       newp->next = NULL;
  69       *((char *) mempcpy (newp->val, inval, invallen)) = '\0';
  70     }
  71
  72   return 0;
  73 }
  74
  75 static void
  76 internal_nis_endetherent (void)
  77 {
  78   while (start != NULL)
  79     {
  80       next = start;
  81       start = start->next;
  82       free (next);
  83     }
  84 }
  85
  86 enum nss_status
  87 _nss_nis_endetherent (void)
  88 {
  89   __libc_lock_lock (lock);
  90
  91   internal_nis_endetherent ();
  92   next = NULL;
  93
  94   __libc_lock_unlock (lock);
  95
  96   return NSS_STATUS_SUCCESS;
  97 }
  98
  99 static enum nss_status
 100 internal_nis_setetherent (void)
 101 {
 102   char *domainname;
 103   struct ypall_callback ypcb;
 104   enum nss_status status;
 105
 106   yp_get_default_domain (&domainname);
 107
 108   internal_nis_endetherent ();
 109
 110   ypcb.foreach = saveit;
 111   ypcb.data = NULL;
 112   status = yperr2nss (yp_all (domainname, "ethers.byname", &ypcb));
 113   next = start;
 114
 115   return status;
 116 }
 117
 118 enum nss_status
 119 _nss_nis_setetherent (int stayopen)
 120 {
 121   enum nss_status result;
 122
 123   __libc_lock_lock (lock);
 124
 125   result = internal_nis_setetherent ();
 126
 127   __libc_lock_unlock (lock);
 128
 129   return result;
 130 }
 131
 132 static enum nss_status
 133 internal_nis_getetherent_r (struct etherent *eth, char *buffer, size_t buflen,
 134                             int *errnop)
 135 {
 136   struct parser_data *data = (void *) buffer;
 137   int parse_res;
 138
 139   if (start == NULL)
 140     internal_nis_setetherent ();
 141
 142   /* Get the next entry until we found a correct one. */
 143   do
 144     {
 145       char *p;
 146
 147       if (next == NULL)
 148         return NSS_STATUS_NOTFOUND;
 149
 150       p = strncpy (buffer, next->val, buflen);
 151
 152       while (isspace (*p))
 153         ++p;
 154
 155       parse_res = _nss_files_parse_etherent (p, eth, data, buflen, errnop);
 156       if (parse_res == -1)
 157         return NSS_STATUS_TRYAGAIN;
 158       next = next->next;
 159     }
 160   while (!parse_res);
 161
 162   return NSS_STATUS_SUCCESS;
 163 }
 164
 165 enum nss_status
 166 _nss_nis_getetherent_r (struct etherent *result, char *buffer, size_t buflen,
 167                         int *errnop)
 168 {
 169   int status;
 170
 171   __libc_lock_lock (lock);
 172
 173   status = internal_nis_getetherent_r (result, buffer, buflen, errnop);
 174
 175   __libc_lock_unlock (lock);
 176
 177   return status;
 178 }
 179
 180 enum nss_status
 181 _nss_nis_gethostton_r (const char *name, struct etherent *eth,
 182                        char *buffer, size_t buflen, int *errnop)
 183 {
 184   if (name == NULL)
 185     {
 186       *errnop = EINVAL;
 187       return NSS_STATUS_UNAVAIL;
 188     }
 189
 190   char *domain;
 191   if (__glibc_unlikely (yp_get_default_domain (&domain)))
 192     return NSS_STATUS_UNAVAIL;
 193
 194   char *result;
 195   int len;
 196   int yperr = yp_match (domain, "ethers.byname", name, strlen (name), &result,
 197                         &len);
 198
 199   if (__glibc_unlikely (yperr != YPERR_SUCCESS))
 200     {
 201       enum nss_status retval = yperr2nss (yperr);
 202
 203       if (retval == NSS_STATUS_TRYAGAIN)
 204         *errnop = errno;
 205       return retval;
 206     }
 207
 208   if (__glibc_unlikely ((size_t) (len + 1) > buflen))
 209     {
 210       free (result);
 211       *errnop = ERANGE;
 212       return NSS_STATUS_TRYAGAIN;
 213     }
 214
 215   char *p = strncpy (buffer, result, len);
 216   buffer[len] = '\0';
 217   while (isspace (*p))
 218     ++p;
 219   free (result);
 220
 221   int parse_res = _nss_files_parse_etherent (p, eth, (void *) buffer, buflen,
 222                                              errnop);
 223   if (__glibc_unlikely (parse_res < 1))
 224     {
 225       if (parse_res == -1)
 226         return NSS_STATUS_TRYAGAIN;
 227       else
 228         return NSS_STATUS_NOTFOUND;
 229     }
 230   return NSS_STATUS_SUCCESS;
 231 }
 232
 233 enum nss_status
 234 _nss_nis_getntohost_r (const struct ether_addr *addr, struct etherent *eth,
 235                        char *buffer, size_t buflen, int *errnop)
 236 {
 237   if (addr == NULL)
 238     {
 239       *errnop = EINVAL;
 240       return NSS_STATUS_UNAVAIL;
 241     }
 242
 243   char *domain;
 244   if (__glibc_unlikely (yp_get_default_domain (&domain)))
 245     return NSS_STATUS_UNAVAIL;
 246
 247   char buf[33];
 248   int nlen = snprintf (buf, sizeof (buf), "%x:%x:%x:%x:%x:%x",
 249                       (int) addr->ether_addr_octet[0],
 250                       (int) addr->ether_addr_octet[1],
 251                       (int) addr->ether_addr_octet[2],
 252                       (int) addr->ether_addr_octet[3],
 253                       (int) addr->ether_addr_octet[4],
 254                       (int) addr->ether_addr_octet[5]);
 255
 256   char *result;
 257   int len;
 258   int yperr = yp_match (domain, "ethers.byaddr", buf, nlen, &result, &len);
 259
 260   if (__glibc_unlikely (yperr != YPERR_SUCCESS))
 261     {
 262       enum nss_status retval = yperr2nss (yperr);
 263
 264       if (retval == NSS_STATUS_TRYAGAIN)
 265         *errnop = errno;
 266       return retval;
 267     }
 268
 269   if (__glibc_unlikely ((size_t) (len + 1) > buflen))
 270     {
 271       free (result);
 272       *errnop = ERANGE;
 273       return NSS_STATUS_TRYAGAIN;
 274     }
 275
 276   char *p = strncpy (buffer, result, len);
 277   buffer[len] = '\0';
 278   while (isspace (*p))
 279     ++p;
 280   free (result);
 281
 282   int parse_res = _nss_files_parse_etherent (p, eth, (void *) buffer, buflen,
 283                                              errnop);
 284   if (__glibc_unlikely (parse_res < 1))
 285     {
 286       if (parse_res == -1)
 287         return NSS_STATUS_TRYAGAIN;
 288       else
 289         return NSS_STATUS_NOTFOUND;
 290     }
 291   return NSS_STATUS_SUCCESS;
 292 }