/* * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de> * 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. */ /* * photuris_error_message: * create a ERROR_MESSAGE packet; return -1 on failure, 0 on success * */ #ifndef lint static char rcsid[] = "$Id: photuris_error_message.c,v 1.2 1997/09/02 17:26:45 provos Exp $"; #endif #include <stdio.h> #include <string.h> #include "config.h" #include "photuris.h" #include "packets.h" #include "state.h" #include "cookie.h" int photuris_error_message(struct stateob *st, u_char *buffer, int *size, char *icookie, char *rcookie, u_int8_t counter, u_int8_t error_type) { struct error_message *header; if (*size < ERROR_MESSAGE_PACKET_SIZE + (error_type == RESOURCE_LIMIT ? 1 : 0)) return -1; /* buffer not large enough */ header = (struct error_message *) buffer; *size = ERROR_MESSAGE_PACKET_SIZE + (error_type == RESOURCE_LIMIT ? 1 : 0); bcopy(icookie, header->icookie, COOKIE_SIZE); bcopy(rcookie, header->rcookie, COOKIE_SIZE); header->type = error_type; if (error_type == RESOURCE_LIMIT) { int i; buffer[ERROR_MESSAGE_PACKET_SIZE] = counter; for(i = 0; i<COOKIE_SIZE; i++) if (rcookie[i] != 0) break; if (i != COOKIE_SIZE || counter != 0) return 0; if (st != NULL) { bcopy(st->rcookie, header->rcookie, COOKIE_SIZE); buffer[ERROR_MESSAGE_PACKET_SIZE] = st->counter; } } return 0; }