236 lines
6.0 KiB
C
236 lines
6.0 KiB
C
/*
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* Portions Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
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* Portions Copyright (C) 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NOMINUM DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Portions Copyright (C) 2001 Nominum, Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NOMINUM DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: ccmsg.c,v 1.10 2007/08/28 07:20:43 tbox Exp $ */
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/*! \file */
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#include <config.h>
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#include <isc/mem.h>
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#include <isc/result.h>
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#include <isc/task.h>
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#include <isc/util.h>
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#include <isccc/events.h>
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#include <isccc/ccmsg.h>
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#define CCMSG_MAGIC ISC_MAGIC('C', 'C', 'm', 's')
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#define VALID_CCMSG(foo) ISC_MAGIC_VALID(foo, CCMSG_MAGIC)
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static void recv_length(isc_task_t *, isc_event_t *);
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static void recv_message(isc_task_t *, isc_event_t *);
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static void
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recv_length(isc_task_t *task, isc_event_t *ev_in) {
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isc_socketevent_t *ev = (isc_socketevent_t *)ev_in;
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isc_event_t *dev;
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isccc_ccmsg_t *ccmsg = ev_in->ev_arg;
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isc_region_t region;
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isc_result_t result;
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INSIST(VALID_CCMSG(ccmsg));
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dev = &ccmsg->event;
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if (ev->result != ISC_R_SUCCESS) {
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ccmsg->result = ev->result;
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goto send_and_free;
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}
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/*
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* Success.
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*/
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ccmsg->size = ntohl(ccmsg->size);
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if (ccmsg->size == 0) {
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ccmsg->result = ISC_R_UNEXPECTEDEND;
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goto send_and_free;
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}
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if (ccmsg->size > ccmsg->maxsize) {
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ccmsg->result = ISC_R_RANGE;
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goto send_and_free;
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}
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region.base = isc_mem_get(ccmsg->mctx, ccmsg->size);
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region.length = ccmsg->size;
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if (region.base == NULL) {
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ccmsg->result = ISC_R_NOMEMORY;
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goto send_and_free;
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}
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isc_buffer_init(&ccmsg->buffer, region.base, region.length);
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result = isc_socket_recv(ccmsg->sock, ®ion, 0,
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task, recv_message, ccmsg);
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if (result != ISC_R_SUCCESS) {
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ccmsg->result = result;
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goto send_and_free;
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}
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isc_event_free(&ev_in);
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return;
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send_and_free:
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isc_task_send(ccmsg->task, &dev);
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ccmsg->task = NULL;
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isc_event_free(&ev_in);
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return;
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}
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static void
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recv_message(isc_task_t *task, isc_event_t *ev_in) {
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isc_socketevent_t *ev = (isc_socketevent_t *)ev_in;
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isc_event_t *dev;
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isccc_ccmsg_t *ccmsg = ev_in->ev_arg;
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(void)task;
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INSIST(VALID_CCMSG(ccmsg));
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dev = &ccmsg->event;
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if (ev->result != ISC_R_SUCCESS) {
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ccmsg->result = ev->result;
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goto send_and_free;
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}
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ccmsg->result = ISC_R_SUCCESS;
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isc_buffer_add(&ccmsg->buffer, ev->n);
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ccmsg->address = ev->address;
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send_and_free:
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isc_task_send(ccmsg->task, &dev);
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ccmsg->task = NULL;
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isc_event_free(&ev_in);
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}
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void
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isccc_ccmsg_init(isc_mem_t *mctx, isc_socket_t *sock, isccc_ccmsg_t *ccmsg) {
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REQUIRE(mctx != NULL);
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REQUIRE(sock != NULL);
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REQUIRE(ccmsg != NULL);
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ccmsg->magic = CCMSG_MAGIC;
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ccmsg->size = 0;
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ccmsg->buffer.base = NULL;
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ccmsg->buffer.length = 0;
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ccmsg->maxsize = 4294967295U; /* Largest message possible. */
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ccmsg->mctx = mctx;
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ccmsg->sock = sock;
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ccmsg->task = NULL; /* None yet. */
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ccmsg->result = ISC_R_UNEXPECTED; /* None yet. */
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/*
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* Should probably initialize the event here, but it can wait.
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*/
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}
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void
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isccc_ccmsg_setmaxsize(isccc_ccmsg_t *ccmsg, unsigned int maxsize) {
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REQUIRE(VALID_CCMSG(ccmsg));
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ccmsg->maxsize = maxsize;
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}
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isc_result_t
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isccc_ccmsg_readmessage(isccc_ccmsg_t *ccmsg,
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isc_task_t *task, isc_taskaction_t action, void *arg)
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{
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isc_result_t result;
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isc_region_t region;
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REQUIRE(VALID_CCMSG(ccmsg));
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REQUIRE(task != NULL);
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REQUIRE(ccmsg->task == NULL); /* not currently in use */
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if (ccmsg->buffer.base != NULL) {
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isc_mem_put(ccmsg->mctx, ccmsg->buffer.base,
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ccmsg->buffer.length);
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ccmsg->buffer.base = NULL;
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ccmsg->buffer.length = 0;
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}
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ccmsg->task = task;
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ccmsg->action = action;
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ccmsg->arg = arg;
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ccmsg->result = ISC_R_UNEXPECTED; /* unknown right now */
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ISC_EVENT_INIT(&ccmsg->event, sizeof(isc_event_t), 0, 0,
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ISCCC_EVENT_CCMSG, action, arg, ccmsg,
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NULL, NULL);
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region.base = (unsigned char *)&ccmsg->size;
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region.length = 4; /* isc_uint32_t */
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result = isc_socket_recv(ccmsg->sock, ®ion, 0,
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ccmsg->task, recv_length, ccmsg);
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if (result != ISC_R_SUCCESS)
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ccmsg->task = NULL;
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return (result);
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}
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void
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isccc_ccmsg_cancelread(isccc_ccmsg_t *ccmsg) {
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REQUIRE(VALID_CCMSG(ccmsg));
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isc_socket_cancel(ccmsg->sock, NULL, ISC_SOCKCANCEL_RECV);
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}
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#if 0
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void
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isccc_ccmsg_freebuffer(isccc_ccmsg_t *ccmsg) {
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REQUIRE(VALID_CCMSG(ccmsg));
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if (ccmsg->buffer.base == NULL)
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return;
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isc_mem_put(ccmsg->mctx, ccmsg->buffer.base, ccmsg->buffer.length);
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ccmsg->buffer.base = NULL;
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ccmsg->buffer.length = 0;
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}
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#endif
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void
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isccc_ccmsg_invalidate(isccc_ccmsg_t *ccmsg) {
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REQUIRE(VALID_CCMSG(ccmsg));
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ccmsg->magic = 0;
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if (ccmsg->buffer.base != NULL) {
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isc_mem_put(ccmsg->mctx, ccmsg->buffer.base,
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ccmsg->buffer.length);
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ccmsg->buffer.base = NULL;
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ccmsg->buffer.length = 0;
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}
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}
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