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
36#include <ctype.h>
37#include <features.h>
38#include <sys/types.h>
39#include <sys/socket.h>
40#include <netdb.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <netinet/ether.h>
45#include <net/ethernet.h>
46
47#include "ethernetdb.h"
48
49#define	MAXALIASES	35
50
51static FILE *etherf = NULL;
52static char line[BUFSIZ + 1];
53static struct ethertypeent et_ent;
54static char *ethertype_aliases[MAXALIASES];
55static int ethertype_stayopen;
56
57void setethertypeent(int f)
58{
59	if (etherf == NULL)
60		etherf = fopen(_PATH_ETHERTYPES, "r");
61	else
62		rewind(etherf);
63	ethertype_stayopen |= f;
64}
65
66void endethertypeent(void)
67{
68	if (etherf) {
69		fclose(etherf);
70		etherf = NULL;
71	}
72	ethertype_stayopen = 0;
73}
74
75struct ethertypeent *getethertypeent(void)
76{
77	char *e;
78	char *endptr;
79	register char *cp, **q;
80
81	if (etherf == NULL
82	    && (etherf = fopen(_PATH_ETHERTYPES, "r")) == NULL) {
83		return (NULL);
84	}
85
86again:
87	if ((e = fgets(line, BUFSIZ, etherf)) == NULL) {
88		return (NULL);
89	}
90	if (*e == '#')
91		goto again;
92	cp = strpbrk(e, "#\n");
93	if (cp == NULL)
94		goto again;
95	*cp = '\0';
96	et_ent.e_name = e;
97	cp = strpbrk(e, " \t");
98	if (cp == NULL)
99		goto again;
100	*cp++ = '\0';
101	while (*cp == ' ' || *cp == '\t')
102		cp++;
103	e = strpbrk(cp, " \t");
104	if (e != NULL)
105		*e++ = '\0';
106// Check point
107	et_ent.e_ethertype = strtol(cp, &endptr, 16);
108	if (*endptr != '\0'
109	    || (et_ent.e_ethertype < ETH_ZLEN
110		|| et_ent.e_ethertype > 0xFFFF))
111		goto again;	// Skip invalid etherproto type entry
112	q = et_ent.e_aliases = ethertype_aliases;
113	if (e != NULL) {
114		cp = e;
115		while (cp && *cp) {
116			if (*cp == ' ' || *cp == '\t') {
117				cp++;
118				continue;
119			}
120			if (q < &ethertype_aliases[MAXALIASES - 1])
121				*q++ = cp;
122			cp = strpbrk(cp, " \t");
123			if (cp != NULL)
124				*cp++ = '\0';
125		}
126	}
127	*q = NULL;
128	return (&et_ent);
129}
130
131
132struct ethertypeent *getethertypebyname(const char *name)
133{
134	register struct ethertypeent *e;
135	register char **cp;
136
137	setethertypeent(ethertype_stayopen);
138	while ((e = getethertypeent()) != NULL) {
139		if (strcasecmp(e->e_name, name) == 0)
140			break;
141		for (cp = e->e_aliases; *cp != 0; cp++)
142			if (strcasecmp(*cp, name) == 0)
143				goto found;
144	}
145found:
146	if (!ethertype_stayopen)
147		endethertypeent();
148	return (e);
149}
150
151struct ethertypeent *getethertypebynumber(int type)
152{
153	register struct ethertypeent *e;
154
155	setethertypeent(ethertype_stayopen);
156	while ((e = getethertypeent()) != NULL)
157		if (e->e_ethertype == type)
158			break;
159	if (!ethertype_stayopen)
160		endethertypeent();
161	return (e);
162}
163