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/* $OpenBSD: tag.c,v 1.3 2011/03/31 09:19:35 sobrado Exp $ */
/*
* Copyright (c) 2000 Network Security Technologies, Inc. http://www.netsec.net
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <net/bpf.h>
#include <errno.h>
#include <string.h>
#include <err.h>
#include <fcntl.h>
#include <unistd.h>
#include <sysexits.h>
#include <stdlib.h>
#include "pppoe.h"
void
tag_init(struct tag_list *l)
{
LIST_INIT(&l->thelist);
}
void
tag_destroy(struct tag_list *l)
{
struct tag_node *p;
while (1) {
p = LIST_FIRST(&l->thelist);
if (p == NULL)
break;
p->_ref--;
if (p->_ref == 0 && p->val)
free(p->val);
LIST_REMOVE(p, next);
free(p);
}
}
struct tag_node *
tag_lookup(struct tag_list *l, u_int16_t type, int idx)
{
struct tag_node *p;
p = LIST_FIRST(&l->thelist);
while (p != NULL) {
if (p->type == type) {
if (idx == 0)
break;
idx--;
}
p = LIST_NEXT(p, next);
}
return (p);
}
int
tag_add(struct tag_list *l, u_int16_t type, u_int16_t len, u_int8_t *val)
{
struct tag_node *p;
p = (struct tag_node *)malloc(sizeof(*p));
if (p == NULL)
return (-1);
if (len) {
p->val = (u_int8_t *)malloc(len);
if (p->val == NULL) {
free(p);
return (-1);
}
memcpy(p->val, val, len);
}
else
p->val = NULL;
p->type = type;
p->len = len;
p->_ref = 1;
LIST_INSERT_HEAD(&l->thelist, p, next);
return (0);
}
int
tag_pkt(struct tag_list *l, u_long pktlen, u_int8_t *pkt)
{
u_int16_t ttype, tlen;
while (pktlen != 0) {
if (pktlen < sizeof(u_int16_t))
break;
ttype = pkt[1] | (pkt[0] << 8);
pkt += sizeof(u_int16_t);
pktlen -= sizeof(u_int16_t);
if (pktlen < sizeof(u_int16_t))
break;
tlen = pkt[1] | (pkt[0] << 8);
pkt += sizeof(u_int16_t);
pktlen -= sizeof(u_int16_t);
if (pktlen < tlen)
break;
if (tag_add(l, ttype, tlen, pkt) < 0)
return (-1);
pkt += tlen;
pktlen -= tlen;
}
if (pktlen != 0)
return (-1);
return (0);
}
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