release/src-rt-6.x.4708/router/ebtables/getethertype.c

   1 /*
   2 * getethertype.c
   3 *
   4 * This file was part of the NYS Library.
   5 *
   6 ** The NYS Library is free software; you can redistribute it and/or
   7 ** modify it under the terms of the GNU Library General Public License as
   8 ** published by the Free Software Foundation; either version 2 of the
   9 ** License, or (at your option) any later version.
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24 */
  25
  26 /********************************************************************
  27 * Description: Ethertype name service switch and the ethertypes
  28 * database access functions
  29 * Author: Nick Fedchik <fnm@ukrsat.com>
  30 * Checker: Bart De Schuymer <bdschuym@pandora.be>
  31 * Origin: uClibc-0.9.16/libc/inet/getproto.c
  32 * Created at: Mon Nov 11 12:20:11 EET 2002
  33 ********************************************************************/
  34
  35 #include <ctype.h>
  36 #include <features.h>
  37 #include <sys/types.h>
  38 #include <sys/socket.h>
  39 #include <netdb.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <netinet/ether.h>
  44 #include <net/ethernet.h>
  45
  46 #include "ethernetdb.h"
  47
  48 #define MAXALIASES      35
  49
  50 static FILE *etherf = NULL;
  51 static char line[BUFSIZ + 1];
  52 static struct ethertypeent et_ent;
  53 static char *ethertype_aliases[MAXALIASES];
  54 static int ethertype_stayopen;
  55
  56 void setethertypeent(int f)
  57 {
  58         if (etherf == NULL)
  59                 etherf = fopen(_PATH_ETHERTYPES, "r");
  60         else
  61                 rewind(etherf);
  62         ethertype_stayopen |= f;
  63 }
  64
  65 void endethertypeent(void)
  66 {
  67         if (etherf) {
  68                 fclose(etherf);
  69                 etherf = NULL;
  70         }
  71         ethertype_stayopen = 0;
  72 }
  73
  74 struct ethertypeent *getethertypeent(void)
  75 {
  76         char *e;
  77         char *endptr;
  78         register char *cp, **q;
  79
  80         if (etherf == NULL
  81             && (etherf = fopen(_PATH_ETHERTYPES, "r")) == NULL) {
  82                 return (NULL);
  83         }
  84
  85 again:
  86         if ((e = fgets(line, BUFSIZ, etherf)) == NULL) {
  87                 return (NULL);
  88         }
  89         if (*e == '#')
  90                 goto again;
  91         cp = strpbrk(e, "#\n");
  92         if (cp == NULL)
  93                 goto again;
  94         *cp = '\0';
  95         et_ent.e_name = e;
  96         cp = strpbrk(e, " \t");
  97         if (cp == NULL)
  98                 goto again;
  99         *cp++ = '\0';
 100         while (*cp == ' ' || *cp == '\t')
 101                 cp++;
 102         e = strpbrk(cp, " \t");
 103         if (e != NULL)
 104                 *e++ = '\0';
 105 // Check point
 106         et_ent.e_ethertype = strtol(cp, &endptr, 16);
 107         if (*endptr != '\0'
 108             || (et_ent.e_ethertype < ETH_ZLEN
 109                 || et_ent.e_ethertype > 0xFFFF))
 110                 goto again;     // Skip invalid etherproto type entry
 111         q = et_ent.e_aliases = ethertype_aliases;
 112         if (e != NULL) {
 113                 cp = e;
 114                 while (cp && *cp) {
 115                         if (*cp == ' ' || *cp == '\t') {
 116                                 cp++;
 117                                 continue;
 118                         }
 119                         if (q < &ethertype_aliases[MAXALIASES - 1])
 120                                 *q++ = cp;
 121                         cp = strpbrk(cp, " \t");
 122                         if (cp != NULL)
 123                                 *cp++ = '\0';
 124                 }
 125         }
 126         *q = NULL;
 127         return (&et_ent);
 128 }
 129
 130
 131 struct ethertypeent *getethertypebyname(const char *name)
 132 {
 133         register struct ethertypeent *e;
 134         register char **cp;
 135
 136         setethertypeent(ethertype_stayopen);
 137         while ((e = getethertypeent()) != NULL) {
 138                 if (strcasecmp(e->e_name, name) == 0)
 139                         break;
 140                 for (cp = e->e_aliases; *cp != 0; cp++)
 141                         if (strcasecmp(*cp, name) == 0)
 142                                 goto found;
 143         }
 144 found:
 145         if (!ethertype_stayopen)
 146                 endethertypeent();
 147         return (e);
 148 }
 149
 150 struct ethertypeent *getethertypebynumber(int type)
 151 {
 152         register struct ethertypeent *e;
 153
 154         setethertypeent(ethertype_stayopen);
 155         while ((e = getethertypeent()) != NULL)
 156                 if (e->e_ethertype == type)
 157                         break;
 158         if (!ethertype_stayopen)
 159                 endethertypeent();
 160         return (e);
 161 }