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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Copyright 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <sys/types.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/dhcp.h>
#include "hash.h"
#include "dhcpd.h"
#include "per_dnet.h"
/*
* This file contains the code which creates, manipulates, and frees encode
* structures.
*/
/*
* Free an individual encode structure, including data.
*/
void
free_encode(ENCODE *ecp)
{
if (ecp != NULL) {
if (ecp->data)
free(ecp->data);
free(ecp);
}
}
/*
* Dump an entire encode list, including data.
*/
void
free_encode_list(ENCODE *ecp)
{
ENCODE *tmp;
while (ecp != NULL) {
tmp = ecp;
ecp = ecp->next;
free_encode(tmp);
}
}
/*
* Allocate an ENCODE structure, and fill it in with the passed data.
*
* Doesn't copy data if copy_flag is not set.
*
* Returns: ptr for success. Doesn't return if a failure occurs.
*/
ENCODE *
make_encode(uchar_t cat, ushort_t code, uchar_t len, void *data,
int copy_flag)
{
ENCODE *ecp;
ecp = (ENCODE *)smalloc(sizeof (ENCODE));
ecp->category = cat;
ecp->code = code;
ecp->len = len;
if (data != NULL && len != 0) {
if (copy_flag == ENC_COPY) {
ecp->data = (uchar_t *)smalloc(len);
(void) memcpy(ecp->data, data, len);
} else
ecp->data = data;
}
return (ecp);
}
/*
* Find a specific code in the ENCODE list. Doesn't consider class.
*
* Returns: ptr if successful, NULL otherwise.
*/
ENCODE *
find_encode(ENCODE *eclp, uchar_t cat, ushort_t code)
{
for (; eclp != NULL; eclp = eclp->next) {
if (eclp->category == cat && eclp->code == code)
return (eclp);
}
return (NULL);
}
/*
* Duplicate the passed encode structure.
*/
ENCODE *
dup_encode(ENCODE *ecp)
{
assert(ecp != NULL);
return (make_encode(ecp->category, ecp->code, ecp->len, ecp->data,
ENC_COPY));
}
/*
* Duplicate an encode list. May be called with NULL as a convenience.
*/
ENCODE *
dup_encode_list(ENCODE *ecp)
{
ENCODE *pp, *np, *headp;
if (ecp == NULL)
return (NULL);
/*
* Note: pp/np are used as placeholders in parallel list.
*/
pp = headp = NULL;
for (; ecp != NULL; ecp = ecp->next) {
np = dup_encode(ecp);
if (pp == NULL) {
headp = np;
np->prev = NULL;
} else {
pp->next = np;
np->prev = pp;
}
pp = np;
}
return (headp);
}
/*
* Given two ENCODE lists, produce NEW ENCODE list by "OR"ing the first
* encode list with the second. Note that the settings in the second encode
* list override any identical code settings in the first encode list.
*
* The primary list is copied if flags argument is ENC_COPY. Class is not
* considered.
*
* Returns a ptr to the merged list for success, NULL ptr otherwise.
*/
ENCODE *
combine_encodes(ENCODE *first_ecp, ENCODE *second_ecp, int flags)
{
ENCODE *ep;
if (first_ecp != NULL) {
if (flags == ENC_COPY)
first_ecp = dup_encode_list(first_ecp);
for (ep = second_ecp; ep != NULL; ep = ep->next)
replace_encode(&first_ecp, ep, ENC_COPY);
} else {
first_ecp = dup_encode_list(second_ecp);
}
return (first_ecp);
}
/*
* Replace/add the encode matching the code value of the second ENCODE
* parameter in the list represented by the first ENCODE parameter.
*/
void
replace_encode(ENCODE **elistpp, ENCODE *rp, int flags)
{
ENCODE *wp;
assert(elistpp != NULL && rp != NULL);
if (flags == ENC_COPY)
rp = dup_encode(rp);
if (*elistpp == NULL) {
*elistpp = rp;
return;
}
wp = find_encode(*elistpp, rp->category, rp->code);
if (wp == NULL) {
rp->next = *elistpp;
rp->next->prev = rp;
*elistpp = rp;
rp->prev = NULL;
} else {
if (wp->prev == NULL) {
rp->next = wp->next;
*elistpp = rp;
rp->prev = NULL;
} else {
rp->next = wp->next;
rp->prev = wp->prev;
wp->prev->next = rp;
}
if (wp->next != NULL)
wp->next->prev = rp;
free_encode(wp);
}
}
/*
* Given a MACRO and a class name, return the ENCODE list for
* that class name, or null if a ENCODE list by that class doesn't exist.
*/
ENCODE *
vendor_encodes(MACRO *mp, char *class)
{
VNDLIST **tvpp;
int i;
assert(mp != NULL && class != NULL);
for (tvpp = mp->list, i = 0; tvpp != NULL && i < mp->classes; i++) {
if (strcmp(tvpp[i]->class, class) == 0)
return (tvpp[i]->head);
}
return (NULL);
}
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