alloc.c

DHCP服务器源码

/* alloc.c

   Memory allocation... */

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * Copyright (c) 1996-2003 by Internet Software Consortium
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 *   Internet Systems Consortium, Inc.
 *   950 Charter Street
 *   Redwood City, CA 94063
 *   <[e-mail]>
 *   http://www.isc.org/
 *
 * This software has been written for Internet Systems Consortium
 * by Ted Lemon in cooperation with Vixie Enterprises and Nominum, Inc.
 * To learn more about Internet Systems Consortium, see
 * ``http://www.isc.org/''.  To learn more about Vixie Enterprises,
 * see ``http://www.vix.com''.   To learn more about Nominum, Inc., see
 * ``http://www.nominum.com''.
 */

#ifndef lint
static char copyright[] =
"$Id: alloc.c,v 1.53.2.10 2004/06/10 17:59:14 dhankins Exp $ Copyright (c) 2004 Internet Systems Consortium.  All rights reserved.\n";
#endif /* not lint */

#include "dhcpd.h"
#include <omapip/omapip_p.h>

struct dhcp_packet *dhcp_free_list;
struct packet *packet_free_list;

int option_chain_head_allocate (ptr, file, line)
	struct option_chain_head **ptr;
	const char *file;
	int line;
{
	int size;
	struct option_chain_head *h;

	if (!ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}
	if (*ptr) {
		log_error ("%s(%d): non-null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		*ptr = (struct option_chain_head *)0;
#endif
	}

	h = dmalloc (sizeof *h, file, line);
	if (h) {
		memset (h, 0, sizeof *h);
		return option_chain_head_reference (ptr, h, file, line);
	}
	return 0;
}

int option_chain_head_reference (ptr, bp, file, line)
	struct option_chain_head **ptr;
	struct option_chain_head *bp;
	const char *file;
	int line;
{
	if (!ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}
	if (*ptr) {
		log_error ("%s(%d): non-null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		*ptr = (struct option_chain_head *)0;
#endif
	}
	*ptr = bp;
	bp -> refcnt++;
	rc_register (file, line, ptr, bp, bp -> refcnt, 0, RC_MISC);
	return 1;
}

int option_chain_head_dereference (ptr, file, line)
	struct option_chain_head **ptr;
	const char *file;
	int line;
{
	int i;
	struct option_chain_head *option_chain_head;
	pair car, cdr;

	if (!ptr || !*ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}

	option_chain_head = *ptr;
	*ptr = (struct option_chain_head *)0;
	--option_chain_head -> refcnt;
	rc_register (file, line, ptr, option_chain_head,
		     option_chain_head -> refcnt, 1, RC_MISC);
	if (option_chain_head -> refcnt > 0)
		return 1;

	if (option_chain_head -> refcnt < 0) {
		log_error ("%s(%d): negative refcnt!", file, line);
#if defined (DEBUG_RC_HISTORY)
		dump_rc_history (option_chain_head);
#endif
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}

	/* If there are any options on this head, free them. */
	for (car = option_chain_head -> first; car; car = cdr) {
		cdr = car -> cdr;
		if (car -> car)
			option_cache_dereference ((struct option_cache **)
						  (&car -> car), MDL);
		dfree (car, MDL);
		car = cdr;
	}

	dfree (option_chain_head, file, line);
	return 1;
}

int group_allocate (ptr, file, line)
	struct group **ptr;
	const char *file;
	int line;
{
	int size;
	struct group *g;

	if (!ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}
	if (*ptr) {
		log_error ("%s(%d): non-null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		*ptr = (struct group *)0;
#endif
	}

	g = dmalloc (sizeof *g, file, line);
	if (g) {
		memset (g, 0, sizeof *g);
		return group_reference (ptr, g, file, line);
	}
	return 0;
}

int group_reference (ptr, bp, file, line)
	struct group **ptr;
	struct group *bp;
	const char *file;
	int line;
{
	if (!ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}
	if (*ptr) {
		log_error ("%s(%d): non-null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		*ptr = (struct group *)0;
#endif
	}
	*ptr = bp;
	bp -> refcnt++;
	rc_register (file, line, ptr, bp, bp -> refcnt, 0, RC_MISC);
	return 1;
}

int group_dereference (ptr, file, line)
	struct group **ptr;
	const char *file;
	int line;
{
	int i;
	struct group *group;

	if (!ptr || !*ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}

	group = *ptr;
	*ptr = (struct group *)0;
	--group -> refcnt;
	rc_register (file, line, ptr, group, group -> refcnt, 1, RC_MISC);
	if (group -> refcnt > 0)
		return 1;

	if (group -> refcnt < 0) {
		log_error ("%s(%d): negative refcnt!", file, line);
#if defined (DEBUG_RC_HISTORY)
		dump_rc_history (group);
#endif
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}

	if (group -> object)
		group_object_dereference (&group -> object, file, line);
	if (group -> subnet)	
		subnet_dereference (&group -> subnet, file, line);
	if (group -> shared_network)
		shared_network_dereference (&group -> shared_network,
					    file, line);
	if (group -> statements)
		executable_statement_dereference (&group -> statements,
						  file, line);
	if (group -> next)
		group_dereference (&group -> next, file, line);
	dfree (group, file, line);
	return 1;
}

struct dhcp_packet *new_dhcp_packet (file, line)
	const char *file;
	int line;
{
	struct dhcp_packet *rval;
	rval = (struct dhcp_packet *)dmalloc (sizeof (struct dhcp_packet),
					      file, line);
	return rval;
}

struct protocol *new_protocol (file, line)
	const char *file;
	int line;
{
	struct protocol *rval = dmalloc (sizeof (struct protocol), file, line);
	return rval;
}

struct domain_search_list *new_domain_search_list (file, line)
	const char *file;
	int line;
{
	struct domain_search_list *rval =
		dmalloc (sizeof (struct domain_search_list), file, line);
	return rval;
}

struct name_server *new_name_server (file, line)
	const char *file;
	int line;
{
	struct name_server *rval =
		dmalloc (sizeof (struct name_server), file, line);
	return rval;
}

void free_name_server (ptr, file, line)
	struct name_server *ptr;
	const char *file;
	int line;
{
	dfree ((VOIDPTR)ptr, file, line);
}

struct option *new_option (file, line)
	const char *file;
	int line;
{
	struct option *rval =
		dmalloc (sizeof (struct option), file, line);
	if (rval)
		memset (rval, 0, sizeof *rval);
	return rval;
}

void free_option (ptr, file, line)
	struct option *ptr;
	const char *file;
	int line;
{
/* XXX have to put all options on heap before this is possible. */
#if 0
	if (ptr -> name)
		dfree ((VOIDPTR)option -> name, file, line);
	dfree ((VOIDPTR)ptr, file, line);
#endif
}

struct universe *new_universe (file, line)
	const char *file;
	int line;
{
	struct universe *rval =
		dmalloc (sizeof (struct universe), file, line);
	return rval;
}

void free_universe (ptr, file, line)
	struct universe *ptr;
	const char *file;
	int line;
{
	dfree ((VOIDPTR)ptr, file, line);
}

void free_domain_search_list (ptr, file, line)
	struct domain_search_list *ptr;
	const char *file;
	int line;
{
	dfree ((VOIDPTR)ptr, file, line);
}

void free_protocol (ptr, file, line)
	struct protocol *ptr;
	const char *file;
	int line;
{
	dfree ((VOIDPTR)ptr, file, line);
}

void free_dhcp_packet (ptr, file, line)
	struct dhcp_packet *ptr;
	const char *file;
	int line;
{
	dfree ((VOIDPTR)ptr, file, line);
}

struct client_lease *new_client_lease (file, line)
	const char *file;
	int line;
{
	return (struct client_lease *)dmalloc (sizeof (struct client_lease),
					       file, line);
}

void free_client_lease (lease, file, line)
	struct client_lease *lease;
	const char *file;
	int line;
{
	dfree (lease, file, line);
}

pair free_pairs;

pair new_pair (file, line)
	const char *file;
	int line;
{
	pair foo;

	if (free_pairs) {
		foo = free_pairs;
		free_pairs = foo -> cdr;
		memset (foo, 0, sizeof *foo);
		dmalloc_reuse (foo, file, line, 0);
		return foo;
	}

	foo = dmalloc (sizeof *foo, file, line);
	if (!foo)
		return foo;
	memset (foo, 0, sizeof *foo);
	return foo;
}

void free_pair (foo, file, line)
	pair foo;
	const char *file;
	int line;
{
	foo -> cdr = free_pairs;
	free_pairs = foo;
	dmalloc_reuse (free_pairs, (char *)0, 0, 0);
}

#if defined (DEBUG_MEMORY_LEAKAGE) || \
		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
void relinquish_free_pairs ()
{
	pair pf, pc;

	for (pf = free_pairs; pf; pf = pc) {
		pc = pf -> cdr;
		dfree (pf, MDL);
	}
	free_pairs = (pair)0;
}
#endif

struct expression *free_expressions;

int expression_allocate (cptr, file, line)
	struct expression **cptr;
	const char *file;
	int line;
{
	struct expression *rval;

	if (free_expressions) {
		rval = free_expressions;
		free_expressions = rval -> data.not;
		dmalloc_reuse (rval, file, line, 1);
	} else {
		rval = dmalloc (sizeof (struct expression), file, line);
		if (!rval)
			return 0;
	}
	memset (rval, 0, sizeof *rval);
	return expression_reference (cptr, rval, file, line);
}

int expression_reference (ptr, src, file, line)
	struct expression **ptr;
	struct expression *src;
	const char *file;
	int line;
{
	if (!ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}
	if (*ptr) {
		log_error ("%s(%d): non-null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		*ptr = (struct expression *)0;
#endif
	}
	*ptr = src;
	src -> refcnt++;
	rc_register (file, line, ptr, src, src -> refcnt, 0, RC_MISC);
	return 1;
}

void free_expression (expr, file, line)
	struct expression *expr;
	const char *file;
	int line;
{
	expr -> data.not = free_expressions;
	free_expressions = expr;
	dmalloc_reuse (free_expressions, (char *)0, 0, 0);
}

#if defined (DEBUG_MEMORY_LEAKAGE) || \
		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
void relinquish_free_expressions ()
{
	struct expression *e, *n;

	for (e = free_expressions; e; e = n) {
		n = e -> data.not;
		dfree (e, MDL);
	}
	free_expressions = (struct expression *)0;
}
#endif

struct binding_value *free_binding_values;
				
int binding_value_allocate (cptr, file, line)
	struct binding_value **cptr;
	const char *file;
	int line;
{
	struct binding_value *rval;

	if (free_binding_values) {
		rval = free_binding_values;
		free_binding_values = rval -> value.bv;
		dmalloc_reuse (rval, file, line, 1);
	} else {
		rval = dmalloc (sizeof (struct binding_value), file, line);
		if (!rval)
			return 0;
	}
	memset (rval, 0, sizeof *rval);
	return binding_value_reference (cptr, rval, file, line);
}

int binding_value_reference (ptr, src, file, line)
	struct binding_value **ptr;
	struct binding_value *src;
	const char *file;
	int line;
{
	if (!ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}
	if (*ptr) {
		log_error ("%s(%d): non-null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		*ptr = (struct binding_value *)0;
#endif
	}
	*ptr = src;
	src -> refcnt++;
	rc_register (file, line, ptr, src, src -> refcnt, 0, RC_MISC);
	return 1;
}

void free_binding_value (bv, file, line)
	struct binding_value *bv;
	const char *file;
	int line;
{
	bv -> value.bv = free_binding_values;
	free_binding_values = bv;
	dmalloc_reuse (free_binding_values, (char *)0, 0, 0);
}

#if defined (DEBUG_MEMORY_LEAKAGE) || \
		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
void relinquish_free_binding_values ()
{
	struct binding_value *b, *n;

	for (b = free_binding_values; b; b = n) {
		n = b -> value.bv;
		dfree (b, MDL);
	}
	free_binding_values = (struct binding_value *)0;
}
#endif

int fundef_allocate (cptr, file, line)
	struct fundef **cptr;
	const char *file;
	int line;
{
	struct fundef *rval;

	rval = dmalloc (sizeof (struct fundef), file, line);
	if (!rval)
		return 0;
	memset (rval, 0, sizeof *rval);
	return fundef_reference (cptr, rval, file, line);
}

int fundef_reference (ptr, src, file, line)
	struct fundef **ptr;
	struct fundef *src;
	const char *file;
	int line;
{
	if (!ptr) {
		log_error ("%s(%d): null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		return 0;
#endif
	}
	if (*ptr) {
		log_error ("%s(%d): non-null pointer", file, line);
#if defined (POINTER_DEBUG)
		abort ();
#else
		*ptr = (struct fundef *)0;
#endif
	}
	*ptr = src;
	src -> refcnt++;
	rc_register (file, line, ptr, src, src -> refcnt, 0, RC_MISC);
	return 1;
}

struct option_cache *free_option_caches;

#if defined (DEBUG_MEMORY_LEAKAGE) || \
		defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
void relinquish_free_option_caches ()
{
	struct option_cache *o, *n;

	for (o = free_option_caches; o; o = n) {
		n = (struct option_cache *)(o -> expression);
		dfree (o, MDL);
	}
	free_option_caches = (struct option_cache *)0;
}
#endif

int option_cache_allocate (cptr, file, line)
	struct option_cache **cptr;
	const char *file;
	int line;
{
	struct option_cache *rval;

	if (free_option_caches) {
		rval = free_option_caches;
		free_option_caches =