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, 264 insertions, 0 deletions

diff --git a/lib/libnetgraph/sock.c b/lib/libnetgraph/sock.c
new file mode 100644
index 0000000..b8bb9e6
--- /dev/null
+++ b/lib/libnetgraph/sock.c
@@ -0,0 +1,264 @@
+
+/*
+ * sock.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: sock.c,v 1.12 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"
+
+/*
+ * Create a socket type node and give it the supplied name.
+ * Return data and control sockets corresponding to the node.
+ * Returns -1 if error and sets errno.
+ */
+int
+NgMkSockNode(const char *name, int *csp, int *dsp)
+{
+	char namebuf[NG_NODELEN + 1];
+	int cs = -1;		/* control socket */
+	int ds = -1;		/* data socket */
+	int errnosv;
+
+	/* Empty name means no name */
+	if (name && *name == 0)
+		name = NULL;
+
+	/* Create control socket; this also creates the netgraph node */
+	if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) {
+		errnosv = errno;
+		if (_gNgDebugLevel >= 1)
+			NGLOG("socket");
+		goto errout;
+	}
+
+	/* Assign the node the desired name, if any */
+	if (name != NULL) {
+		u_char sbuf[NG_NODELEN + 3];
+		struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
+
+		/* Assign name */
+		snprintf(sg->sg_data, NG_NODELEN + 1, "%s", name);
+		sg->sg_family = AF_NETGRAPH;
+		sg->sg_len = strlen(sg->sg_data) + 3;
+		if (bind(cs, (struct sockaddr *) sg, sg->sg_len) < 0) {
+			errnosv = errno;
+			if (_gNgDebugLevel >= 1)
+				NGLOG("bind(%s)", sg->sg_data);
+			goto errout;
+		}
+
+		/* Save node name */
+		snprintf(namebuf, sizeof(namebuf), "%s", name);
+	} else if (dsp != NULL) {
+		u_char rbuf[sizeof(struct ng_mesg) + sizeof(struct nodeinfo)];
+		struct ng_mesg *const resp = (struct ng_mesg *) rbuf;
+		struct nodeinfo *const ni = (struct nodeinfo *) resp->data;
+
+		/* Find out the node ID */
+		if (NgSendMsg(cs, ".", NGM_GENERIC_COOKIE,
+		    NGM_NODEINFO, NULL, 0) < 0) {
+			errnosv = errno;
+			if (_gNgDebugLevel >= 1)
+				NGLOG("send nodeinfo");
+			goto errout;
+		}
+		if (NgRecvMsg(cs, resp, sizeof(rbuf), NULL) < 0) {
+			errnosv = errno;
+			if (_gNgDebugLevel >= 1)
+				NGLOG("recv nodeinfo");
+			goto errout;
+		}
+
+		/* Save node "name" */
+		snprintf(namebuf, sizeof(namebuf), "[%lx]", (u_long) ni->id);
+	}
+
+	/* Create data socket if desired */
+	if (dsp != NULL) {
+		u_char sbuf[NG_NODELEN + 4];
+		struct sockaddr_ng *const sg = (struct sockaddr_ng *) sbuf;
+
+		/* Create data socket, initially just "floating" */
+		if ((ds = socket(AF_NETGRAPH, SOCK_DGRAM, NG_DATA)) < 0) {
+			errnosv = errno;
+			if (_gNgDebugLevel >= 1)
+				NGLOG("socket");
+			goto errout;
+		}
+
+		/* Associate the data socket with the node */
+		snprintf(sg->sg_data, NG_NODELEN + 2, "%s:", namebuf);
+		sg->sg_family = AF_NETGRAPH;
+		sg->sg_len = strlen(sg->sg_data) + 3;
+		if (connect(ds, (struct sockaddr *) sg, sg->sg_len) < 0) {
+			errnosv = errno;
+			if (_gNgDebugLevel >= 1)
+				NGLOG("connect(%s)", sg->sg_data);
+			goto errout;
+		}
+	}
+
+	/* Return the socket(s) */
+	if (csp)
+		*csp = cs;
+	else
+		close(cs);
+	if (dsp)
+		*dsp = ds;
+	return (0);
+
+errout:
+	/* Failed */
+	if (cs >= 0)
+		close(cs);
+	if (ds >= 0)
+		close(ds);
+	errno = errnosv;
+	return (-1);
+}
+
+/*
+ * Assign a globally unique name to a node
+ * Returns -1 if error and sets errno.
+ */
+int
+NgNameNode(int cs, const char *path, const char *fmt, ...)
+{
+	struct ngm_name ngn;
+	va_list args;
+
+	/* Build message arg */
+	va_start(args, fmt);
+	vsnprintf(ngn.name, sizeof(ngn.name), fmt, args);
+	va_end(args);
+
+	/* Send message */
+	if (NgSendMsg(cs, path,
+	    NGM_GENERIC_COOKIE, NGM_NAME, &ngn, sizeof(ngn)) < 0) {
+		if (_gNgDebugLevel >= 1)
+			NGLOGX("%s: failed", __FUNCTION__);
+		return (-1);
+	}
+
+	/* Done */
+	return (0);
+}
+
+/*
+ * Read a packet from a data socket
+ * Returns -1 if error and sets errno.
+ */
+int
+NgRecvData(int ds, u_char * buf, size_t len, char *hook)
+{
+	u_char frombuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)];
+	struct sockaddr_ng *const from = (struct sockaddr_ng *) frombuf;
+	int fromlen = sizeof(frombuf);
+	int rtn, errnosv;
+
+	/* Read packet */
+	rtn = recvfrom(ds, buf, len, 0, (struct sockaddr *) from, &fromlen);
+	if (rtn < 0) {
+		errnosv = errno;
+		if (_gNgDebugLevel >= 1)
+			NGLOG("recvfrom");
+		errno = errnosv;
+		return (-1);
+	}
+
+	/* Copy hook name */
+	if (hook != NULL)
+		snprintf(hook, NG_HOOKLEN + 1, "%s", from->sg_data);
+
+	/* Debugging */
+	if (_gNgDebugLevel >= 2) {
+		NGLOGX("READ %s from hook \"%s\" (%d bytes)",
+		       rtn ? "PACKET" : "EOF", from->sg_data, rtn);
+		if (_gNgDebugLevel >= 3)
+			_NgDebugBytes(buf, rtn);
+	}
+
+	/* Done */
+	return (rtn);
+}
+
+/*
+ * Write a packet to a data socket. The packet will be sent
+ * out the corresponding node on the specified hook.
+ * Returns -1 if error and sets errno.
+ */
+int
+NgSendData(int ds, const char *hook, const u_char * buf, size_t len)
+{
+	u_char sgbuf[NG_HOOKLEN + sizeof(struct sockaddr_ng)];
+	struct sockaddr_ng *const sg = (struct sockaddr_ng *) sgbuf;
+	int errnosv;
+
+	/* Set up destination hook */
+	sg->sg_family = AF_NETGRAPH;
+	snprintf(sg->sg_data, NG_HOOKLEN + 1, "%s", hook);
+	sg->sg_len = strlen(sg->sg_data) + 3;
+
+	/* Debugging */
+	if (_gNgDebugLevel >= 2) {
+		NGLOGX("WRITE PACKET to hook \"%s\" (%d bytes)", hook, len);
+		_NgDebugSockaddr(sg);
+		if (_gNgDebugLevel >= 3)
+			_NgDebugBytes(buf, len);
+	}
+
+	/* Send packet */
+	if (sendto(ds, buf, len, 0, (struct sockaddr *) sg, sg->sg_len) < 0) {
+		errnosv = errno;
+		if (_gNgDebugLevel >= 1)
+			NGLOG("sendto(%s)", sg->sg_data);
+		errno = errnosv;
+		return (-1);
+	}
+
+	/* Done */
+	return (0);
+}
+