Whistle's Netgraph link-layer (sometimes more) networking infrastructure.

Been in production for 3 years now. Gives Instant Frame relay to if_sr
and if_ar drivers, and PPPOE support soon. See:
ftp://ftp.whistle.com/pub/archie/netgraph/index.html
for on-line manual pages.

Reviewed by: Doug Rabson (dfr@freebsd.org)
Obtained from:  Whistle CVS tree

1 files changed, 206 insertions, 0 deletions

diff --git a/lib/libnetgraph/msg.c b/lib/libnetgraph/msg.c
new file mode 100644
index 0000000..7eda707
--- /dev/null
+++ b/lib/libnetgraph/msg.c
@@ -0,0 +1,206 @@
+
+/*
+ * 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);
+}
+