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-rw-r--r--lib/isccc/ccmsg.c230
1 files changed, 230 insertions, 0 deletions
diff --git a/lib/isccc/ccmsg.c b/lib/isccc/ccmsg.c
new file mode 100644
index 0000000..4cfa528
--- /dev/null
+++ b/lib/isccc/ccmsg.c
@@ -0,0 +1,230 @@
+/*
+ * 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, &region, 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, &region, 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;
+ }
+}