/* * Copyright 1997 Niels Provos * All rights reserved. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Niels Provos. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * 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. */ /* * handle_resource_limit: * receive a RESOURCE_LIMIT packet; return -1 on failure, 0 on success * */ #ifndef lint static char rcsid[] = "$Id: handle_resource_limit.c,v 1.1 1998/11/14 23:37:24 deraadt Exp $"; #endif #include #include #include #include "config.h" #include "photuris.h" #include "packets.h" #include "state.h" #include "cookie.h" #include "buffer.h" #include "packet.h" #include "schedule.h" #include "errlog.h" int handle_resource_limit(u_char *packet, int size, char *address) { struct error_message *header; struct stateob *st; int offset, counter; if (size != ERROR_MESSAGE_PACKET_SIZE + 1) return -1; /* packet too small/big */ header = (struct error_message *) packet; counter = packet[ERROR_MESSAGE_PACKET_SIZE]; if ((st = state_find_cookies(NULL, header->icookie, NULL)) == NULL) { log_error(0, "No state for RESOURCE_LIMIT message from %s", address); return -1; } switch(st->phase) { case COOKIE_REQUEST: /* * The other party has still an exchange which has been * purged on our side. */ if (counter != 0) { bcopy(header->rcookie, st->rcookie, COOKIE_SIZE); st->counter = counter; } /* We crank the timeout, so we can start a new exchange */ st->lifetime += exchange_timeout; st->resource = 1; case VALUE_REQUEST: offset = schedule_offset(TIMEOUT, st->icookie); if (offset == -1) offset = retrans_timeout; else { offset *= 2; if (offset > exchange_timeout/2) offset = exchange_timeout/2; } schedule_remove(TIMEOUT, st->icookie); schedule_insert(TIMEOUT, offset, st->icookie, COOKIE_SIZE); break; case SPI_UPDATE: /* XXX - we have to wait for expiring of another SPI */ break; default: log_error(0, "Wrong phase for RESOURCE_LIMIT from %s", address); return 0; } return 0; }