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/*
* getethertype.c
*
* This file was part of the NYS Library.
*
** The NYS Library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Library General Public License as
** published by the Free Software Foundation; either version 2 of the
** License, or (at your option) any later version.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/********************************************************************
* Description: Ethertype name service switch and the ethertypes
* database access functions
* Author: Nick Fedchik <fnm@ukrsat.com>
* Checker: Bart De Schuymer <bdschuym@pandora.be>
* Origin: uClibc-0.9.16/libc/inet/getproto.c
* Created at: Mon Nov 11 12:20:11 EET 2002
********************************************************************/
#include <ctype.h>
#include <features.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/ether.h>
#include <net/ethernet.h>
#include <xtables.h>
#define MAXALIASES 35
static FILE *etherf = NULL;
static char line[BUFSIZ + 1];
static struct xt_ethertypeent et_ent;
static char *ethertype_aliases[MAXALIASES];
static int ethertype_stayopen;
static void setethertypeent(int f)
{
if (etherf == NULL)
etherf = fopen(XT_PATH_ETHERTYPES, "r");
else
rewind(etherf);
ethertype_stayopen |= f;
}
static void endethertypeent(void)
{
if (etherf) {
fclose(etherf);
etherf = NULL;
}
ethertype_stayopen = 0;
}
static struct xt_ethertypeent *getethertypeent(void)
{
char *e;
char *endptr;
register char *cp, **q;
if (etherf == NULL
&& (etherf = fopen(XT_PATH_ETHERTYPES, "r")) == NULL) {
return (NULL);
}
again:
if ((e = fgets(line, BUFSIZ, etherf)) == NULL) {
return (NULL);
}
if (*e == '#')
goto again;
cp = strpbrk(e, "#\n");
if (cp == NULL)
goto again;
*cp = '\0';
et_ent.e_name = e;
cp = strpbrk(e, " \t");
if (cp == NULL)
goto again;
*cp++ = '\0';
while (*cp == ' ' || *cp == '\t')
cp++;
e = strpbrk(cp, " \t");
if (e != NULL)
*e++ = '\0';
// Check point
et_ent.e_ethertype = strtol(cp, &endptr, 16);
if (*endptr != '\0'
|| (et_ent.e_ethertype < ETH_ZLEN
|| et_ent.e_ethertype > 0xFFFF))
goto again; // Skip invalid etherproto type entry
q = et_ent.e_aliases = ethertype_aliases;
if (e != NULL) {
cp = e;
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < ðertype_aliases[MAXALIASES - 1])
*q++ = cp;
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
}
*q = NULL;
return (&et_ent);
}
struct xt_ethertypeent *xtables_getethertypebyname(const char *name)
{
register struct xt_ethertypeent *e;
register char **cp;
setethertypeent(ethertype_stayopen);
while ((e = getethertypeent()) != NULL) {
if (strcasecmp(e->e_name, name) == 0)
break;
for (cp = e->e_aliases; *cp != 0; cp++)
if (strcasecmp(*cp, name) == 0)
goto found;
}
found:
if (!ethertype_stayopen)
endethertypeent();
return (e);
}
struct xt_ethertypeent *xtables_getethertypebynumber(int type)
{
register struct xt_ethertypeent *e;
setethertypeent(ethertype_stayopen);
while ((e = getethertypeent()) != NULL)
if (e->e_ethertype == type)
break;
if (!ethertype_stayopen)
endethertypeent();
return (e);
}
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