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- /* $Id: symonnet.c,v 1.16 2007/02/11 20:07:32 dijkstra Exp $ */
- /*
- * Copyright (c) 2001-2004 Willem Dijkstra
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- */
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netdb.h>
- #include <string.h>
- #include <errno.h>
- #include <time.h>
- #include "conf.h"
- #include "error.h"
- #include "data.h"
- #include "symon.h"
- #include "net.h"
- /* Fill a mux structure with inet details */
- void
- connect2mux(struct mux * mux)
- {
- struct sockaddr_storage sockaddr;
- int family;
- bzero((void *) &sockaddr, sizeof(sockaddr));
- get_mux_sockaddr(mux, SOCK_DGRAM);
- family = mux->sockaddr.ss_family;
- get_sockaddr(&sockaddr, family, SOCK_DGRAM, AI_PASSIVE, mux->localaddr, "0");
- if ((mux->symuxsocket = socket(family, SOCK_DGRAM, 0)) == -1)
- fatal("could not obtain socket: %.200s", strerror(errno));
- if (bind(mux->symuxsocket, (struct sockaddr *) & sockaddr, SS_LEN(&sockaddr)) == -1)
- fatal("could not bind socket: %.200s", strerror(errno));
- info("sending packets to udp %.200s", mux->name);
- }
- /* Send data stored in the mux structure to a mux */
- void
- send_packet(struct mux * mux)
- {
- if (sendto(mux->symuxsocket, (void *) &mux->packet.data,
- mux->offset, 0, (struct sockaddr *) & mux->sockaddr,
- SS_LEN(&mux->sockaddr))
- != mux->offset) {
- mux->senderr++;
- }
- if (mux->senderr >= SYMON_WARN_SENDERR) {
- warning("%d updates to mux(%.200s) lost due to send errors",
- mux->senderr, mux->name);
- mux->senderr = 0;
- }
- }
- /* Prepare a packet for data */
- void
- prepare_packet(struct mux * mux)
- {
- time_t t = time(NULL);
- bzero(&mux->packet, sizeof(mux->packet));
- mux->packet.header.symon_version = SYMON_PACKET_VER;
- mux->packet.header.timestamp = t;
- /* symonpacketheader is always first stream */
- mux->offset =
- setheader((char *) &mux->packet.data,
- &mux->packet.header);
- }
- /* Put a stream into the packet for a mux */
- void
- stream_in_packet(struct stream * stream, struct mux * mux)
- {
- mux->offset +=
- (streamfunc[stream->type].get) /* call getter of stream */
- (&mux->packet.data[mux->offset], /* packet buffer */
- sizeof(mux->packet.data) - mux->offset, /* maxlen */
- stream);
- }
- /* Ready a packet for transmission, set length and crc */
- void
- finish_packet(struct mux * mux)
- {
- mux->packet.header.length = mux->offset;
- mux->packet.header.crc = 0;
- /* fill in correct header with crc = 0 */
- setheader((char *) &mux->packet.data, &mux->packet.header);
- /* fill in correct header with crc */
- mux->packet.header.crc = crc32(&mux->packet.data, mux->offset);
- setheader((char *) &mux->packet.data, &mux->packet.header);
- }
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