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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0 AND ISC
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*
* Copyright (C) 2001 Nominum, Inc.
*
* Permission to use, copy, modify, and/or 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 AND NOMINUM 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.
*/
/*! \file */
#include <inttypes.h>
#include <isc/mem.h>
#include <isc/netmgr.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/util.h>
#include <isccc/ccmsg.h>
#include <isccc/events.h>
#define CCMSG_MAGIC ISC_MAGIC('C', 'C', 'm', 's')
#define VALID_CCMSG(foo) ISC_MAGIC_VALID(foo, CCMSG_MAGIC)
static void
recv_data(isc_nmhandle_t *handle, isc_result_t eresult, isc_region_t *region,
void *arg) {
isccc_ccmsg_t *ccmsg = arg;
size_t size;
INSIST(VALID_CCMSG(ccmsg));
switch (eresult) {
case ISC_R_SHUTTINGDOWN:
case ISC_R_CANCELED:
case ISC_R_EOF:
ccmsg->result = eresult;
goto done;
case ISC_R_SUCCESS:
if (region == NULL) {
ccmsg->result = ISC_R_EOF;
goto done;
}
ccmsg->result = ISC_R_SUCCESS;
break;
default:
ccmsg->result = eresult;
goto done;
}
if (!ccmsg->length_received) {
if (region->length < sizeof(uint32_t)) {
ccmsg->result = ISC_R_UNEXPECTEDEND;
goto done;
}
ccmsg->size = ntohl(*(uint32_t *)region->base);
if (ccmsg->size == 0) {
ccmsg->result = ISC_R_UNEXPECTEDEND;
goto done;
}
if (ccmsg->size > ccmsg->maxsize) {
ccmsg->result = ISC_R_RANGE;
goto done;
}
isc_region_consume(region, sizeof(uint32_t));
isc_buffer_allocate(ccmsg->mctx, &ccmsg->buffer, ccmsg->size);
ccmsg->length_received = true;
}
/*
* If there's no more data, wait for more
*/
if (region->length == 0) {
return;
}
/* We have some data in the buffer, read it */
size = ISC_MIN(isc_buffer_availablelength(ccmsg->buffer),
region->length);
isc_buffer_putmem(ccmsg->buffer, region->base, size);
isc_region_consume(region, size);
if (isc_buffer_usedlength(ccmsg->buffer) == ccmsg->size) {
ccmsg->result = ISC_R_SUCCESS;
goto done;
}
/* Wait for more data to come */
return;
done:
isc_nm_pauseread(handle);
ccmsg->cb(handle, ccmsg->result, ccmsg->cbarg);
}
void
isccc_ccmsg_init(isc_mem_t *mctx, isc_nmhandle_t *handle,
isccc_ccmsg_t *ccmsg) {
REQUIRE(mctx != NULL);
REQUIRE(handle != NULL);
REQUIRE(ccmsg != NULL);
*ccmsg = (isccc_ccmsg_t){
.magic = CCMSG_MAGIC,
.maxsize = 0xffffffffU, /* Largest message possible. */
.mctx = mctx,
.handle = handle,
.result = ISC_R_UNEXPECTED /* None yet. */
};
}
void
isccc_ccmsg_setmaxsize(isccc_ccmsg_t *ccmsg, unsigned int maxsize) {
REQUIRE(VALID_CCMSG(ccmsg));
ccmsg->maxsize = maxsize;
}
void
isccc_ccmsg_readmessage(isccc_ccmsg_t *ccmsg, isc_nm_cb_t cb, void *cbarg) {
REQUIRE(VALID_CCMSG(ccmsg));
if (ccmsg->buffer != NULL) {
isc_buffer_free(&ccmsg->buffer);
}
ccmsg->cb = cb;
ccmsg->cbarg = cbarg;
ccmsg->result = ISC_R_UNEXPECTED; /* unknown right now */
ccmsg->length_received = false;
if (ccmsg->reading) {
isc_nm_resumeread(ccmsg->handle);
} else {
isc_nm_read(ccmsg->handle, recv_data, ccmsg);
ccmsg->reading = true;
}
}
void
isccc_ccmsg_cancelread(isccc_ccmsg_t *ccmsg) {
REQUIRE(VALID_CCMSG(ccmsg));
if (ccmsg->reading) {
isc_nm_cancelread(ccmsg->handle);
ccmsg->reading = false;
}
}
void
isccc_ccmsg_invalidate(isccc_ccmsg_t *ccmsg) {
REQUIRE(VALID_CCMSG(ccmsg));
ccmsg->magic = 0;
if (ccmsg->buffer != NULL) {
isc_buffer_free(&ccmsg->buffer);
}
}
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