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/* $OpenBSD: session.c,v 1.5 2011/11/05 09:20:36 yasuoka 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 <sys/types.h>
#include <sys/socket.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 <string.h>
#include <unistd.h>
#include <stdlib.h>
#include "pppoe.h"
struct pppoe_session_master session_master;
void
session_destroy(struct pppoe_session *s)
{
if (s->s_fd != -1)
close(s->s_fd);
LIST_REMOVE(s, s_next);
free(s);
}
struct pppoe_session *
session_new(struct ether_addr *ea)
{
struct pppoe_session *s;
u_int32_t x;
u_int16_t id = 1;
int tries = 1000;
if (session_master.sm_nsessions == PPPOE_MAXSESSIONS)
return (NULL);
while (tries--) {
x = cookie_bake();
id = ((x >> 16) & 0xffff) ^ (x & 0xffff);
s = LIST_FIRST(&session_master.sm_sessions);
while (s) {
if (memcmp(ea, &s->s_ea, ETHER_ADDR_LEN) == 0 &&
s->s_id == id)
break;
s = LIST_NEXT(s, s_next);
}
if (s == NULL)
break;
}
if (tries == 0)
return (NULL);
s = (struct pppoe_session *)malloc(sizeof(*s));
if (s == NULL)
return (NULL);
s->s_id = id;
s->s_fd = -1;
memcpy(&s->s_ea, ea, ETHER_ADDR_LEN);
LIST_INSERT_HEAD(&session_master.sm_sessions, s, s_next);
return (s);
}
struct pppoe_session *
session_find_eaid(struct ether_addr *ea, u_int16_t id)
{
struct pppoe_session *s;
s = LIST_FIRST(&session_master.sm_sessions);
while (s) {
if (memcmp(ea, &s->s_ea, ETHER_ADDR_LEN) == 0 && s->s_id == id)
return (s);
s = LIST_NEXT(s, s_next);
}
return (NULL);
}
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