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/*
* msg.c
*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Archie Cobbs <archie@whistle.com>
*
* $FreeBSD$
* $Whistle: msg.c,v 1.9 1999/01/20 00:57:23 archie Exp $
*/
#include <sys/types.h>
#include <stdarg.h>
#include <netgraph/ng_message.h>
#include <netgraph/ng_socket.h>
#include "netgraph.h"
#include "internal.h"
/* Next message token value */
static int gMsgId;
/* For delivering both messages and replies */
static int NgDeliverMsg(int cs, const char *path,
const struct ng_mesg *hdr, const void *args, size_t arglen);
/*
* Send a message to a node using control socket node "cs".
* Returns -1 if error and sets errno appropriately.
* If successful, returns the message ID (token) used.
*/
int
NgSendMsg(int cs, const char *path,
int cookie, int cmd, const void *args, size_t arglen)
{
struct ng_mesg msg;
/* Prepare message header */
memset(&msg, 0, sizeof(msg));
msg.header.version = NG_VERSION;
msg.header.typecookie = cookie;
msg.header.token = ++gMsgId;
msg.header.flags = NGF_ORIG;
msg.header.cmd = cmd;
snprintf(msg.header.cmdstr, NG_CMDSTRLEN + 1, "cmd%d", cmd);
/* Deliver message */
if (NgDeliverMsg(cs, path, &msg, args, arglen) < 0)
return (-1);
return(gMsgId);
}
/*
* Send a message that is a reply to a previously received message.
* Returns -1 and sets errno on error, otherwise returns zero.
*/
int
NgSendReplyMsg(int cs, const char *path,
const struct ng_mesg *msg, const void *args, size_t arglen)
{
struct ng_mesg rep;
/* Prepare message header */
rep = *msg;
rep.header.flags = NGF_RESP;
/* Deliver message */
return (NgDeliverMsg(cs, path, &rep, args, arglen));
}
/*
* Send a message to a node using control socket node "cs".
* Returns -1 if error and sets errno appropriately, otherwise zero.
*/
static int
NgDeliverMsg(int cs, const char *path,
const struct ng_mesg *hdr, const void *args, size_t arglen)
{
u_char sgbuf[NG_PATHLEN + 3];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
u_char *buf = NULL;
struct ng_mesg *msg;
int errnosv = 0;
int rtn = 0;
/* Sanity check */
if (args == NULL)
arglen = 0;
/* Get buffer */
if ((buf = malloc(sizeof(*msg) + arglen)) == NULL) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("malloc");
rtn = -1;
goto done;
}
msg = (struct ng_mesg *) buf;
/* Finalize message */
*msg = *hdr;
msg->header.arglen = arglen;
memcpy(msg->data, args, arglen);
/* Prepare socket address */
sg->sg_family = AF_NETGRAPH;
snprintf(sg->sg_data, NG_PATHLEN + 1, "%s", path);
sg->sg_len = strlen(sg->sg_data) + 3;
/* Debugging */
if (_gNgDebugLevel >= 2) {
NGLOGX("SENDING %s:",
(msg->header.flags & NGF_RESP) ? "RESPONSE" : "MESSAGE");
_NgDebugSockaddr(sg);
_NgDebugMsg(msg);
}
/* Send it */
if (sendto(cs, msg, sizeof(*msg) + arglen,
0, (struct sockaddr *) sg, sg->sg_len) < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("sendto(%s)", sg->sg_data);
rtn = -1;
goto done;
}
done:
/* Done */
free(buf); /* OK if buf is NULL */
errno = errnosv;
return (rtn);
}
/*
* Receive a control message.
*
* On error, this returns -1 and sets errno.
* Otherwise, it returns the length of the received reply.
*/
int
NgRecvMsg(int cs, struct ng_mesg *rep, size_t replen, char *path)
{
u_char sgbuf[NG_PATHLEN + sizeof(struct sockaddr_ng)];
struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
int len, sglen = sizeof(sgbuf);
int errnosv;
/* Read reply */
len = recvfrom(cs, rep, replen, 0, (struct sockaddr *) sg, &sglen);
if (len < 0) {
errnosv = errno;
if (_gNgDebugLevel >= 1)
NGLOG("recvfrom");
goto errout;
}
if (path != NULL)
snprintf(path, NG_PATHLEN + 1, "%s", sg->sg_data);
/* Debugging */
if (_gNgDebugLevel >= 2) {
NGLOGX("RECEIVED %s:",
(rep->header.flags & NGF_RESP) ? "RESPONSE" : "MESSAGE");
_NgDebugSockaddr(sg);
_NgDebugMsg(rep);
}
/* Done */
return (len);
errout:
errno = errnosv;
return (-1);
}
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