diff options
Diffstat (limited to '')
| -rw-r--r-- | lib/isccc/ccmsg.c | 230 |
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, ®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; + } +} |