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/* dispatch.c
Network input dispatcher... */
/*
* Copyright (c) 2004-2006 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1995-2003 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
* <info@isc.org>
* 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''.
*/
#include "dhcpd.h"
struct timeout *timeouts;
static struct timeout *free_timeouts;
void set_time(TIME t)
{
/* Do any outstanding timeouts. */
if (cur_time != t) {
cur_time = t;
process_outstanding_timeouts ((struct timeval *)0);
}
}
struct timeval *process_outstanding_timeouts (struct timeval *tvp)
{
/* Call any expired timeouts, and then if there's
still a timeout registered, time out the select
call then. */
another:
if (timeouts) {
struct timeout *t;
if (timeouts -> when <= cur_time) {
t = timeouts;
timeouts = timeouts -> next;
(*(t -> func)) (t -> what);
if (t -> unref)
(*t -> unref) (&t -> what, MDL);
t -> next = free_timeouts;
free_timeouts = t;
goto another;
}
if (tvp) {
tvp -> tv_sec = timeouts -> when;
tvp -> tv_usec = 0;
}
return tvp;
} else
return (struct timeval *)0;
}
/* Wait for packets to come in using select(). When one does, call
receive_packet to receive the packet and possibly strip hardware
addressing information from it, and then call through the
bootp_packet_handler hook to try to do something with it. */
void dispatch ()
{
struct timeval tv, *tvp;
isc_result_t status;
/* Wait for a packet or a timeout... XXX */
do {
tvp = process_outstanding_timeouts (&tv);
status = omapi_one_dispatch (0, tvp);
} while (status == ISC_R_TIMEDOUT || status == ISC_R_SUCCESS);
log_fatal ("omapi_one_dispatch failed: %s -- exiting.",
isc_result_totext (status));
}
void add_timeout (when, where, what, ref, unref)
TIME when;
void (*where) PROTO ((void *));
void *what;
tvref_t ref;
tvunref_t unref;
{
struct timeout *t, *q;
/* See if this timeout supersedes an existing timeout. */
t = (struct timeout *)0;
for (q = timeouts; q; q = q -> next) {
if ((where == NULL || q -> func == where) &&
q -> what == what) {
if (t)
t -> next = q -> next;
else
timeouts = q -> next;
break;
}
t = q;
}
/* If we didn't supersede a timeout, allocate a timeout
structure now. */
if (!q) {
if (free_timeouts) {
q = free_timeouts;
free_timeouts = q -> next;
} else {
q = ((struct timeout *)
dmalloc (sizeof (struct timeout), MDL));
if (!q)
log_fatal ("add_timeout: no memory!");
}
memset (q, 0, sizeof *q);
q -> func = where;
q -> ref = ref;
q -> unref = unref;
if (q -> ref)
(*q -> ref)(&q -> what, what, MDL);
else
q -> what = what;
}
q -> when = when;
/* Now sort this timeout into the timeout list. */
/* Beginning of list? */
if (!timeouts || timeouts -> when > q -> when) {
q -> next = timeouts;
timeouts = q;
return;
}
/* Middle of list? */
for (t = timeouts; t -> next; t = t -> next) {
if (t -> next -> when > q -> when) {
q -> next = t -> next;
t -> next = q;
return;
}
}
/* End of list. */
t -> next = q;
q -> next = (struct timeout *)0;
}
void cancel_timeout (where, what)
void (*where) PROTO ((void *));
void *what;
{
struct timeout *t, *q;
/* Look for this timeout on the list, and unlink it if we find it. */
t = (struct timeout *)0;
for (q = timeouts; q; q = q -> next) {
if (q -> func == where && q -> what == what) {
if (t)
t -> next = q -> next;
else
timeouts = q -> next;
break;
}
t = q;
}
/* If we found the timeout, put it on the free list. */
if (q) {
if (q -> unref)
(*q -> unref) (&q -> what, MDL);
q -> next = free_timeouts;
free_timeouts = q;
}
}
#if defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT)
void cancel_all_timeouts ()
{
struct timeout *t, *n;
for (t = timeouts; t; t = n) {
n = t -> next;
if (t -> unref && t -> what)
(*t -> unref) (&t -> what, MDL);
t -> next = free_timeouts;
free_timeouts = t;
}
}
void relinquish_timeouts ()
{
struct timeout *t, *n;
for (t = free_timeouts; t; t = n) {
n = t -> next;
dfree (t, MDL);
}
}
#endif
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