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-rw-r--r--libxtables/getethertype.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/libxtables/getethertype.c b/libxtables/getethertype.c
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+++ b/libxtables/getethertype.c
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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 <ebtables/ethernetdb.h>
+
+#define MAXALIASES 35
+
+static FILE *etherf = NULL;
+static char line[BUFSIZ + 1];
+static struct ethertypeent et_ent;
+static char *ethertype_aliases[MAXALIASES];
+static int ethertype_stayopen;
+
+void setethertypeent(int f)
+{
+ if (etherf == NULL)
+ etherf = fopen(_PATH_ETHERTYPES, "r");
+ else
+ rewind(etherf);
+ ethertype_stayopen |= f;
+}
+
+void endethertypeent(void)
+{
+ if (etherf) {
+ fclose(etherf);
+ etherf = NULL;
+ }
+ ethertype_stayopen = 0;
+}
+
+struct ethertypeent *getethertypeent(void)
+{
+ char *e;
+ char *endptr;
+ register char *cp, **q;
+
+ if (etherf == NULL
+ && (etherf = fopen(_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 < &ethertype_aliases[MAXALIASES - 1])
+ *q++ = cp;
+ cp = strpbrk(cp, " \t");
+ if (cp != NULL)
+ *cp++ = '\0';
+ }
+ }
+ *q = NULL;
+ return (&et_ent);
+}
+
+
+struct ethertypeent *getethertypebyname(const char *name)
+{
+ register struct 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 ethertypeent *getethertypebynumber(int type)
+{
+ register struct ethertypeent *e;
+
+ setethertypeent(ethertype_stayopen);
+ while ((e = getethertypeent()) != NULL)
+ if (e->e_ethertype == type)
+ break;
+ if (!ethertype_stayopen)
+ endethertypeent();
+ return (e);
+}