1 files changed, 430 insertions, 0 deletions
diff --git a/usr.sbin/amd/amd/rpc_fwd.c b/usr.sbin/amd/amd/rpc_fwd.c
new file mode 100644
index 0000000..aaf1e0a
--- /dev/null
+++ b/usr.sbin/amd/amd/rpc_fwd.c
@@ -0,0 +1,430 @@
+/*
+ * Copyright (c) 1989 Jan-Simon Pendry
+ * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jan-Simon Pendry at Imperial College, London.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ *	@(#)rpc_fwd.c	8.1 (Berkeley) 6/6/93
+ *
+ * $Id: rpc_fwd.c,v 5.2.2.1 1992/02/09 15:09:01 jsp beta $
+ *
+ */
+
+/*
+ * RPC packet forwarding
+ */
+
+#include "am.h"
+#include <sys/ioctl.h>
+#ifndef F_SETFL
+#include <fcntl.h>
+#endif /* F_SETFL */
+#ifndef FNDELAY
+#include <sys/file.h>
+#endif /* FNDELAY */
+
+/*
+ * Note that the ID field in the external packet is only
+ * ever treated as a 32 bit opaque data object, so there
+ * is no need to convert to and from network byte ordering.
+ */
+
+/*
+ * Each pending reply has an rpc_forward structure
+ * associated with it.  These have a 15 second lifespan.
+ * If a new structure is required, then an expired
+ * one will be re-allocated if available, otherwise a fresh
+ * one is allocated.  Whenever a reply is received the
+ * structure is discarded.
+ */
+typedef struct rpc_forward rpc_forward;
+struct rpc_forward {
+	qelem	rf_q;		/* Linked list */
+	time_t	rf_ttl;		/* Time to live */
+	u_int	rf_xid;		/* Packet id */
+	u_int	rf_oldid;	/* Original packet id */
+	fwd_fun	rf_fwd;		/* Forwarding function */
+	voidp	rf_ptr;
+	struct sockaddr_in rf_sin;
+};
+
+/*
+ * Head of list of pending replies
+ */
+extern qelem rpc_head;
+qelem rpc_head = { &rpc_head, &rpc_head };
+
+static u_int xid;
+#define	XID_ALLOC()	(xid++)
+
+#define	MAX_PACKET_SIZE	8192	/* Maximum UDP packet size */
+
+int fwd_sock;
+
+/*
+ * Allocate a rely structure
+ */
+static rpc_forward *fwd_alloc()
+{
+	time_t now = clocktime();
+	rpc_forward *p = 0, *p2;
+
+#ifdef DEBUG
+	/*dlog("fwd_alloca: rpc_head = %#x", rpc_head.q_forw);*/
+#endif /* DEBUG */
+	/*
+	 * First search for an existing expired one.
+	 */
+	ITER(p2, rpc_forward, &rpc_head) {
+		if (p2->rf_ttl <= now) {
+			p = p2;
+			break;
+		}
+	}
+
+	/*
+	 * If one couldn't be found then allocate
+	 * a new structure and link it at the
+	 * head of the list.
+	 */
+	if (p) {
+		/*
+		 * Call forwarding function to say that
+		 * this message was junked.
+		 */
+#ifdef DEBUG
+		dlog("Re-using packet forwarding slot - id %#x", p->rf_xid);
+#endif /* DEBUG */
+		if (p->rf_fwd)
+			(*p->rf_fwd)(0, 0, 0, &p->rf_sin, p->rf_ptr, FALSE);
+		rem_que(&p->rf_q);
+	} else {
+		p = ALLOC(rpc_forward);
+	}
+	ins_que(&p->rf_q, &rpc_head);
+
+	/*
+	 * Set the time to live field
+	 * Timeout in 43 seconds 
+	 */
+	p->rf_ttl = now + 43;
+
+#ifdef DEBUG
+	/*dlog("fwd_alloca: rpc_head = %#x", rpc_head.q_forw);*/
+#endif /* DEBUG */
+	return p;
+}
+
+/*
+ * Free an allocated reply structure.
+ * First unlink it from the list, then
+ * discard it.
+ */
+static void fwd_free(p)
+rpc_forward *p;
+{
+#ifdef DEBUG
+	/*dlog("fwd_free: rpc_head = %#x", rpc_head.q_forw);*/
+#endif /* DEBUG */
+	rem_que(&p->rf_q);
+#ifdef DEBUG
+	/*dlog("fwd_free: rpc_head = %#x", rpc_head.q_forw);*/
+#endif /* DEBUG */
+	free((voidp) p);
+}
+
+/*
+ * Initialise the RPC forwarder
+ */
+int fwd_init()
+{
+	int on = 1;
+
+	/*
+	 * Create ping socket
+	 */
+	fwd_sock = socket(AF_INET, SOCK_DGRAM, 0);
+	if (fwd_sock < 0) {
+		plog(XLOG_ERROR, "Unable to create RPC forwarding socket: %m");
+		return errno;
+	}
+
+	/*
+	 * Some things we talk to require a priv port - so make one here
+	 */
+	if (bind_resv_port(fwd_sock, (unsigned short *) 0) < 0)
+		plog(XLOG_ERROR, "can't bind privileged port");
+
+	if (fcntl(fwd_sock, F_SETFL, FNDELAY) < 0 &&
+			ioctl(fwd_sock, FIONBIO, &on) < 0) {
+		plog(XLOG_ERROR, "Can't set non-block on forwarding socket: %m");
+		return errno;
+	}
+
+	return 0;
+}
+
+/*
+ * Locate a packet in the forwarding list
+ */
+static rpc_forward *fwd_locate(id)
+u_int id;
+{
+	rpc_forward *p;
+
+	ITER(p, rpc_forward, &rpc_head) {
+		if (p->rf_xid == id)
+			return p;
+	}
+
+	return 0;
+}
+
+/*
+ * This is called to forward a packet to another
+ * RPC server.  The message id is changed and noted
+ * so that when a reply appears we can tie it up
+ * correctly.  Just matching the reply's source address
+ * would not work because it might come from a
+ * different address.
+ */
+int fwd_packet(type_id, pkt, len, fwdto, replyto, i, cb)
+int type_id;
+voidp pkt;
+int len;
+struct sockaddr_in *fwdto, *replyto;
+voidp i;
+fwd_fun cb;
+{
+	rpc_forward *p;
+	u_int *pkt_int;
+	int error;
+
+	if ((int)amd_state >= (int)Finishing)
+		return ENOENT;
+
+	/*
+	 * See if the type_id is fully specified.
+	 * If so, then discard any old entries
+	 * for this id.
+	 * Otherwise make sure the type_id is
+	 * fully qualified by allocating an id here.
+	 */
+#ifdef DEBUG
+	switch (type_id & RPC_XID_MASK) {
+	case RPC_XID_PORTMAP: dlog("Sending PORTMAP request"); break;
+	case RPC_XID_MOUNTD: dlog("Sending MOUNTD request %#x", type_id); break;
+	case RPC_XID_NFSPING: dlog("Sending NFS ping"); break;
+	default: dlog("UNKNOWN RPC XID"); break;
+	}
+#endif /* DEBUG */
+
+	if (type_id & ~RPC_XID_MASK) {
+#ifdef DEBUG
+		/*dlog("Fully qualified rpc type provided");*/
+#endif /* DEBUG */
+		p = fwd_locate(type_id);
+		if (p) {
+#ifdef DEBUG
+			dlog("Discarding earlier rpc fwd handle");
+#endif /* DEBUG */
+			fwd_free(p);
+		}
+	} else {
+#ifdef DEBUG
+		dlog("Allocating a new xid...");
+#endif /* DEBUG */
+		type_id = MK_RPC_XID(type_id, XID_ALLOC());
+	}
+
+	p = fwd_alloc();
+	if (!p)
+		return ENOBUFS;
+
+	error = 0;
+
+	pkt_int = (u_int *) pkt;
+
+	/*
+	 * Get the original packet id
+	 */
+	p->rf_oldid = *pkt_int;
+
+	/*
+	 * Replace with newly allocated id
+	 */
+	p->rf_xid = *pkt_int = type_id;
+
+	/*
+	 * The sendto may fail if, for example, the route
+	 * to a remote host is lost because an intermediate
+	 * gateway has gone down.  Important to fill in the
+	 * rest of "p" otherwise nasty things happen later...
+	 */
+#ifdef DEBUG
+	{ char dq[20]; 
+	dlog("Sending packet id %#x to %s.%d", p->rf_xid, inet_dquad(dq, fwdto->sin_addr.s_addr), ntohs(fwdto->sin_port));
+	}
+#endif /* DEBUG */
+	if (sendto(fwd_sock, (char *) pkt, len, 0,
+			(struct sockaddr *) fwdto, sizeof(*fwdto)) < 0)
+		error = errno;
+
+	/*
+	 * Save callback function and return address
+	 */
+	p->rf_fwd = cb;
+	if (replyto)
+		p->rf_sin = *replyto;
+	else
+		bzero((voidp) &p->rf_sin, sizeof(p->rf_sin));
+	p->rf_ptr = i;
+
+	return error;
+}
+
+/*
+ * Called when some data arrives on the forwarding socket
+ */
+void fwd_reply()
+{
+	int len;
+#ifdef DYNAMIC_BUFFERS
+	voidp pkt;
+#else
+	u_int pkt[MAX_PACKET_SIZE/sizeof(u_int)+1];
+#endif /* DYNAMIC_BUFFERS */
+	u_int *pkt_int;
+	int rc;
+	rpc_forward *p;
+	struct sockaddr_in src_addr;
+	int src_addr_len;
+
+	/*
+	 * Determine the length of the packet
+	 */
+#ifdef DYNAMIC_BUFFERS
+	if (ioctl(fwd_sock, FIONREAD, &len) < 0) {
+		plog(XLOG_ERROR, "Error reading packet size: %m");
+		return;
+	}
+
+	/*
+	 * Allocate a buffer
+	 */
+	pkt = (voidp) malloc((unsigned) len);
+	if (!pkt) {
+		plog(XLOG_ERROR, "Out of buffers in fwd_reply");
+		return;
+	}
+#else
+	len = MAX_PACKET_SIZE;
+#endif /* DYNAMIC_BUFFERS */
+
+	/*
+	 * Read the packet and check for validity
+	 */
+again:
+	src_addr_len = sizeof(src_addr);
+	rc = recvfrom(fwd_sock, (char *) pkt, len, 0,
+			(struct sockaddr *) &src_addr, &src_addr_len);
+	if (rc < 0 || src_addr_len != sizeof(src_addr) ||
+			src_addr.sin_family != AF_INET) {
+		if (rc < 0 && errno == EINTR)
+			goto again;
+		plog(XLOG_ERROR, "Error reading RPC reply: %m");
+		goto out;
+	}
+
+#ifdef DYNAMIC_BUFFERS
+	if (rc != len) {
+		plog(XLOG_ERROR, "Short read in fwd_reply");
+		goto out;
+	}
+#endif /* DYNAMIC_BUFFERS */
+
+	/*
+	 * Do no more work if finishing soon
+	 */
+	if ((int)amd_state >= (int)Finishing)
+		goto out;
+
+	/*
+	 * Find packet reference
+	 */
+	pkt_int = (u_int *) pkt;
+
+#ifdef DEBUG
+	switch (*pkt_int & RPC_XID_MASK) {
+	case RPC_XID_PORTMAP: dlog("Receiving PORTMAP reply"); break;
+	case RPC_XID_MOUNTD: dlog("Receiving MOUNTD reply %#x", *pkt_int); break;
+	case RPC_XID_NFSPING: dlog("Receiving NFS ping %#x", *pkt_int); break;
+	default: dlog("UNKNOWN RPC XID"); break;
+	}
+#endif /* DEBUG */
+
+	p = fwd_locate(*pkt_int);
+	if (!p) {
+#ifdef DEBUG
+		dlog("Can't forward reply id %#x", *pkt_int);
+#endif /* DEBUG */
+		goto out;
+	}
+
+	if (p->rf_fwd) {
+		/*
+		 * Put the original message id back
+		 * into the packet.
+		 */
+		*pkt_int = p->rf_oldid;
+
+		/*
+		 * Call forwarding function
+		 */
+		(*p->rf_fwd)((voidp) pkt, rc, &src_addr, &p->rf_sin, p->rf_ptr, TRUE);
+	}
+
+	/*
+	 * Free forwarding info
+	 */
+	fwd_free(p);
+
+out:;
+#ifdef DYNAMIC_BUFFERS
+	/*
+	 * Free the packet
+	 */
+	free((voidp) pkt);
+#endif /* DYNAMIC_BUFFERS */
+}