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/*
* Portions Copyright (C) Internet Systems Consortium, Inc. ("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 http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*
* Portions 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 <config.h>
#include <inttypes.h>
#include <isc/mem.h>
#include <isc/result.h>
#include <isc/task.h>
#include <isc/util.h>
#include <isccc/events.h>
#include <isccc/ccmsg.h>
#define CCMSG_MAGIC ISC_MAGIC('C', 'C', 'm', 's')
#define VALID_CCMSG(foo) ISC_MAGIC_VALID(foo, CCMSG_MAGIC)
static void recv_length(isc_task_t *, isc_event_t *);
static void recv_message(isc_task_t *, isc_event_t *);
static void
recv_length(isc_task_t *task, isc_event_t *ev_in) {
isc_socketevent_t *ev = (isc_socketevent_t *)ev_in;
isc_event_t *dev;
isccc_ccmsg_t *ccmsg = ev_in->ev_arg;
isc_region_t region;
isc_result_t result;
INSIST(VALID_CCMSG(ccmsg));
dev = &ccmsg->event;
if (ev->result != ISC_R_SUCCESS) {
ccmsg->result = ev->result;
goto send_and_free;
}
/*
* Success.
*/
ccmsg->size = ntohl(ccmsg->size);
if (ccmsg->size == 0) {
ccmsg->result = ISC_R_UNEXPECTEDEND;
goto send_and_free;
}
if (ccmsg->size > ccmsg->maxsize) {
ccmsg->result = ISC_R_RANGE;
goto send_and_free;
}
region.base = isc_mem_get(ccmsg->mctx, ccmsg->size);
region.length = ccmsg->size;
if (region.base == NULL) {
ccmsg->result = ISC_R_NOMEMORY;
goto send_and_free;
}
isc_buffer_init(&ccmsg->buffer, region.base, region.length);
result = isc_socket_recv(ccmsg->sock, ®ion, 0,
task, recv_message, ccmsg);
if (result != ISC_R_SUCCESS) {
ccmsg->result = result;
goto send_and_free;
}
isc_event_free(&ev_in);
return;
send_and_free:
isc_task_send(ccmsg->task, &dev);
ccmsg->task = NULL;
isc_event_free(&ev_in);
return;
}
static void
recv_message(isc_task_t *task, isc_event_t *ev_in) {
isc_socketevent_t *ev = (isc_socketevent_t *)ev_in;
isc_event_t *dev;
isccc_ccmsg_t *ccmsg = ev_in->ev_arg;
(void)task;
INSIST(VALID_CCMSG(ccmsg));
dev = &ccmsg->event;
if (ev->result != ISC_R_SUCCESS) {
ccmsg->result = ev->result;
goto send_and_free;
}
ccmsg->result = ISC_R_SUCCESS;
isc_buffer_add(&ccmsg->buffer, ev->n);
ccmsg->address = ev->address;
send_and_free:
isc_task_send(ccmsg->task, &dev);
ccmsg->task = NULL;
isc_event_free(&ev_in);
}
void
isccc_ccmsg_init(isc_mem_t *mctx, isc_socket_t *sock, isccc_ccmsg_t *ccmsg) {
REQUIRE(mctx != NULL);
REQUIRE(sock != NULL);
REQUIRE(ccmsg != NULL);
ccmsg->magic = CCMSG_MAGIC;
ccmsg->size = 0;
ccmsg->buffer.base = NULL;
ccmsg->buffer.length = 0;
ccmsg->maxsize = 4294967295U; /* Largest message possible. */
ccmsg->mctx = mctx;
ccmsg->sock = sock;
ccmsg->task = NULL; /* None yet. */
ccmsg->result = ISC_R_UNEXPECTED; /* None yet. */
/*
* Should probably initialize the event here, but it can wait.
*/
}
void
isccc_ccmsg_setmaxsize(isccc_ccmsg_t *ccmsg, unsigned int maxsize) {
REQUIRE(VALID_CCMSG(ccmsg));
ccmsg->maxsize = maxsize;
}
isc_result_t
isccc_ccmsg_readmessage(isccc_ccmsg_t *ccmsg,
isc_task_t *task, isc_taskaction_t action, void *arg)
{
isc_result_t result;
isc_region_t region;
REQUIRE(VALID_CCMSG(ccmsg));
REQUIRE(task != NULL);
REQUIRE(ccmsg->task == NULL); /* not currently in use */
if (ccmsg->buffer.base != NULL) {
isc_mem_put(ccmsg->mctx, ccmsg->buffer.base,
ccmsg->buffer.length);
ccmsg->buffer.base = NULL;
ccmsg->buffer.length = 0;
}
ccmsg->task = task;
ccmsg->action = action;
ccmsg->arg = arg;
ccmsg->result = ISC_R_UNEXPECTED; /* unknown right now */
ISC_EVENT_INIT(&ccmsg->event, sizeof(isc_event_t), 0, 0,
ISCCC_EVENT_CCMSG, action, arg, ccmsg,
NULL, NULL);
region.base = (unsigned char *)&ccmsg->size;
region.length = 4; /* uint32_t */
result = isc_socket_recv(ccmsg->sock, ®ion, 0,
ccmsg->task, recv_length, ccmsg);
if (result != ISC_R_SUCCESS)
ccmsg->task = NULL;
return (result);
}
void
isccc_ccmsg_cancelread(isccc_ccmsg_t *ccmsg) {
REQUIRE(VALID_CCMSG(ccmsg));
isc_socket_cancel(ccmsg->sock, NULL, ISC_SOCKCANCEL_RECV);
}
#if 0
void
isccc_ccmsg_freebuffer(isccc_ccmsg_t *ccmsg) {
REQUIRE(VALID_CCMSG(ccmsg));
if (ccmsg->buffer.base == NULL)
return;
isc_mem_put(ccmsg->mctx, ccmsg->buffer.base, ccmsg->buffer.length);
ccmsg->buffer.base = NULL;
ccmsg->buffer.length = 0;
}
#endif
void
isccc_ccmsg_invalidate(isccc_ccmsg_t *ccmsg) {
REQUIRE(VALID_CCMSG(ccmsg));
ccmsg->magic = 0;
if (ccmsg->buffer.base != NULL) {
isc_mem_put(ccmsg->mctx, ccmsg->buffer.base,
ccmsg->buffer.length);
ccmsg->buffer.base = NULL;
ccmsg->buffer.length = 0;
}
}
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