1 files changed, 334 insertions, 0 deletions

diff --git a/sys/rpc/svc_dg.c b/sys/rpc/svc_dg.c
new file mode 100644
index 0000000..08d5947
--- /dev/null
+++ b/sys/rpc/svc_dg.c
@@ -0,0 +1,334 @@
+/*	$NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $	*/
+
+/*
+ * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
+ * unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part.  Users
+ * may copy or modify Sun RPC without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ * 
+ * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
+ * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
+ * 
+ * Sun RPC is provided with no support and without any obligation on the
+ * part of Sun Microsystems, Inc. to assist in its use, correction,
+ * modification or enhancement.
+ * 
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
+ * OR ANY PART THEREOF.
+ * 
+ * In no event will Sun Microsystems, Inc. be liable for any lost revenue
+ * or profits or other special, indirect and consequential damages, even if
+ * Sun has been advised of the possibility of such damages.
+ * 
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California  94043
+ */
+
+/*
+ * Copyright (c) 1986-1991 by Sun Microsystems Inc.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#ident	"@(#)svc_dg.c	1.17	94/04/24 SMI"
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * svc_dg.c, Server side for connectionless RPC.
+ */
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/mutex.h>
+#include <sys/protosw.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/systm.h>
+#include <sys/uio.h>
+
+#include <rpc/rpc.h>
+
+#include "rpc_com.h"
+
+static enum xprt_stat svc_dg_stat(SVCXPRT *);
+static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *);
+static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *);
+static bool_t svc_dg_getargs(SVCXPRT *, xdrproc_t, void *);
+static bool_t svc_dg_freeargs(SVCXPRT *, xdrproc_t, void *);
+static void svc_dg_destroy(SVCXPRT *);
+static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
+static void svc_dg_soupcall(struct socket *so, void *arg, int waitflag);
+
+static struct xp_ops svc_dg_ops = {
+	.xp_recv =	svc_dg_recv,
+	.xp_stat =	svc_dg_stat,
+	.xp_getargs =	svc_dg_getargs,
+	.xp_reply =	svc_dg_reply,
+	.xp_freeargs =	svc_dg_freeargs,
+	.xp_destroy =	svc_dg_destroy,
+	.xp_control =	svc_dg_control,
+};
+
+/*
+ * Usage:
+ *	xprt = svc_dg_create(sock, sendsize, recvsize);
+ * Does other connectionless specific initializations.
+ * Once *xprt is initialized, it is registered.
+ * see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
+ * system defaults are chosen.
+ * The routines returns NULL if a problem occurred.
+ */
+static const char svc_dg_str[] = "svc_dg_create: %s";
+static const char svc_dg_err1[] = "could not get transport information";
+static const char svc_dg_err2[] = "transport does not support data transfer";
+static const char __no_mem_str[] = "out of memory";
+
+SVCXPRT *
+svc_dg_create(SVCPOOL *pool, struct socket *so, size_t sendsize,
+    size_t recvsize)
+{
+	SVCXPRT *xprt;
+	struct __rpc_sockinfo si;
+	struct sockaddr* sa;
+	int error;
+
+	if (!__rpc_socket2sockinfo(so, &si)) {
+		printf(svc_dg_str, svc_dg_err1);
+		return (NULL);
+	}
+	/*
+	 * Find the receive and the send size
+	 */
+	sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
+	recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
+	if ((sendsize == 0) || (recvsize == 0)) {
+		printf(svc_dg_str, svc_dg_err2);
+		return (NULL);
+	}
+
+	xprt = mem_alloc(sizeof (SVCXPRT));
+	memset(xprt, 0, sizeof (SVCXPRT));
+	mtx_init(&xprt->xp_lock, "xprt->xp_lock", NULL, MTX_DEF);
+	xprt->xp_pool = pool;
+	xprt->xp_socket = so;
+	xprt->xp_p1 = NULL;
+	xprt->xp_p2 = NULL;
+	xprt->xp_ops = &svc_dg_ops;
+
+	error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
+	if (error)
+		goto freedata;
+
+	xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
+	xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
+	xprt->xp_ltaddr.len = sa->sa_len;
+	memcpy(xprt->xp_ltaddr.buf, sa, sa->sa_len);
+	free(sa, M_SONAME);
+
+	xprt->xp_rtaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
+	xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
+	xprt->xp_rtaddr.len = 0;
+
+	xprt_register(xprt);
+
+	SOCKBUF_LOCK(&so->so_rcv);
+	so->so_upcallarg = xprt;
+	so->so_upcall = svc_dg_soupcall;
+	so->so_rcv.sb_flags |= SB_UPCALL;
+	SOCKBUF_UNLOCK(&so->so_rcv);
+
+	return (xprt);
+freedata:
+	(void) printf(svc_dg_str, __no_mem_str);
+	if (xprt) {
+		(void) mem_free(xprt, sizeof (SVCXPRT));
+	}
+	return (NULL);
+}
+
+/*ARGSUSED*/
+static enum xprt_stat
+svc_dg_stat(SVCXPRT *xprt)
+{
+
+	return (XPRT_IDLE);
+}
+
+static bool_t
+svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg)
+{
+	struct uio uio;
+	struct sockaddr *raddr;
+	struct mbuf *mreq;
+	int error, rcvflag;
+
+	/*
+	 * The socket upcall calls xprt_active() which will eventually
+	 * cause the server to call us here. We attempt to read a
+	 * packet from the socket and process it. If the read fails,
+	 * we have drained all pending requests so we call
+	 * xprt_inactive().
+	 *
+	 * The lock protects us in the case where a new packet arrives
+	 * on the socket after our call to soreceive fails with
+	 * EWOULDBLOCK - the call to xprt_active() in the upcall will
+	 * happen only after our call to xprt_inactive() which ensures
+	 * that we will remain active. It might be possible to use
+	 * SOCKBUF_LOCK for this - its not clear to me what locks are
+	 * held during the upcall.
+	 */
+	mtx_lock(&xprt->xp_lock);
+
+	uio.uio_resid = 1000000000;
+	uio.uio_td = curthread;
+	mreq = NULL;
+	rcvflag = MSG_DONTWAIT;
+	error = soreceive(xprt->xp_socket, &raddr, &uio, &mreq, NULL, &rcvflag);
+
+	if (error == EWOULDBLOCK) {
+		xprt_inactive(xprt);
+		mtx_unlock(&xprt->xp_lock);
+		return (FALSE);
+	}
+
+	if (error) {
+		SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
+		xprt->xp_socket->so_upcallarg = NULL;
+		xprt->xp_socket->so_upcall = NULL;
+		xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
+		SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
+		xprt_inactive(xprt);
+		mtx_unlock(&xprt->xp_lock);
+		return (FALSE);
+	}
+
+	mtx_unlock(&xprt->xp_lock);
+
+	KASSERT(raddr->sa_len < xprt->xp_rtaddr.maxlen,
+	    ("Unexpected remote address length"));
+	memcpy(xprt->xp_rtaddr.buf, raddr, raddr->sa_len);
+	xprt->xp_rtaddr.len = raddr->sa_len;
+	free(raddr, M_SONAME);
+
+	xdrmbuf_create(&xprt->xp_xdrreq, mreq, XDR_DECODE);
+	if (! xdr_callmsg(&xprt->xp_xdrreq, msg)) {
+		XDR_DESTROY(&xprt->xp_xdrreq);
+		return (FALSE);
+	}
+	xprt->xp_xid = msg->rm_xid;
+
+	return (TRUE);
+}
+
+static bool_t
+svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg)
+{
+	struct mbuf *mrep;
+	bool_t stat = FALSE;
+	int error;
+
+	MGETHDR(mrep, M_WAIT, MT_DATA);
+	MCLGET(mrep, M_WAIT);
+	mrep->m_len = 0;
+
+	xdrmbuf_create(&xprt->xp_xdrrep, mrep, XDR_ENCODE);
+	msg->rm_xid = xprt->xp_xid;
+	if (xdr_replymsg(&xprt->xp_xdrrep, msg)) {
+		m_fixhdr(mrep);
+		error = sosend(xprt->xp_socket,
+		    (struct sockaddr *) xprt->xp_rtaddr.buf, NULL, mrep, NULL,
+		    0, curthread);
+		if (!error) {
+			stat = TRUE;
+		}
+	} else {
+		m_freem(mrep);
+	}
+
+	/*
+	 * This frees the request mbuf chain as well. The reply mbuf
+	 * chain was consumed by sosend.
+	 */
+	XDR_DESTROY(&xprt->xp_xdrreq);
+	XDR_DESTROY(&xprt->xp_xdrrep);
+	xprt->xp_p2 = NULL;
+
+	return (stat);
+}
+
+static bool_t
+svc_dg_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
+{
+
+	return (xdr_args(&xprt->xp_xdrreq, args_ptr));
+}
+
+static bool_t
+svc_dg_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, void *args_ptr)
+{
+	XDR xdrs;
+
+	/*
+	 * Free the request mbuf here - this allows us to handle
+	 * protocols where not all requests have replies
+	 * (i.e. NLM). Note that xdrmbuf_destroy handles being called
+	 * twice correctly - the mbuf will only be freed once.
+	 */
+	XDR_DESTROY(&xprt->xp_xdrreq);
+
+	xdrs.x_op = XDR_FREE;
+	return (xdr_args(&xdrs, args_ptr));
+}
+
+static void
+svc_dg_destroy(SVCXPRT *xprt)
+{
+	SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
+	xprt->xp_socket->so_upcallarg = NULL;
+	xprt->xp_socket->so_upcall = NULL;
+	xprt->xp_socket->so_rcv.sb_flags &= ~SB_UPCALL;
+	SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
+
+	xprt_unregister(xprt);
+
+	mtx_destroy(&xprt->xp_lock);
+	if (xprt->xp_socket)
+		(void)soclose(xprt->xp_socket);
+
+	if (xprt->xp_rtaddr.buf)
+		(void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
+	if (xprt->xp_ltaddr.buf)
+		(void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
+	(void) mem_free(xprt, sizeof (SVCXPRT));
+}
+
+static bool_t
+/*ARGSUSED*/
+svc_dg_control(xprt, rq, in)
+	SVCXPRT *xprt;
+	const u_int	rq;
+	void		*in;
+{
+
+	return (FALSE);
+}
+
+static void
+svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
+{
+	SVCXPRT *xprt = (SVCXPRT *) arg;
+
+	mtx_lock(&xprt->xp_lock);
+	xprt_active(xprt);
+	mtx_unlock(&xprt->xp_lock);
+}