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- /* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos Exp $ */
- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 2009, Sun Microsystems, Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * - Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * - 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.
- * - Neither the name of Sun Microsystems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
- */
- /*
- * 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/sx.h>
- #include <sys/systm.h>
- #include <sys/uio.h>
- #include <net/vnet.h>
- #include <rpc/rpc.h>
- #include <rpc/rpc_com.h>
- static enum xprt_stat svc_dg_stat(SVCXPRT *);
- static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *,
- struct sockaddr **, struct mbuf **);
- static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *,
- struct sockaddr *, struct mbuf *, uint32_t *);
- static void svc_dg_destroy(SVCXPRT *);
- static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
- static int 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_reply = svc_dg_reply,
- .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 = svc_xprt_alloc();
- sx_init(&xprt->xp_lock, "xprt->xp_lock");
- xprt->xp_pool = pool;
- xprt->xp_socket = so;
- xprt->xp_p1 = NULL;
- xprt->xp_p2 = NULL;
- xprt->xp_ops = &svc_dg_ops;
- CURVNET_SET(so->so_vnet);
- error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
- CURVNET_RESTORE();
- if (error)
- goto freedata;
- memcpy(&xprt->xp_ltaddr, sa, sa->sa_len);
- free(sa, M_SONAME);
- xprt_register(xprt);
- SOCKBUF_LOCK(&so->so_rcv);
- soupcall_set(so, SO_RCV, svc_dg_soupcall, xprt);
- SOCKBUF_UNLOCK(&so->so_rcv);
- return (xprt);
- freedata:
- (void) printf(svc_dg_str, __no_mem_str);
- svc_xprt_free(xprt);
- return (NULL);
- }
- /*ARGSUSED*/
- static enum xprt_stat
- svc_dg_stat(SVCXPRT *xprt)
- {
- if (soreadable(xprt->xp_socket))
- return (XPRT_MOREREQS);
- return (XPRT_IDLE);
- }
- static bool_t
- svc_dg_recv(SVCXPRT *xprt, struct rpc_msg *msg,
- struct sockaddr **addrp, struct mbuf **mp)
- {
- struct uio uio;
- struct sockaddr *raddr;
- struct mbuf *mreq;
- XDR xdrs;
- int error, rcvflag;
- /*
- * Serialise access to the socket.
- */
- sx_xlock(&xprt->xp_lock);
- /*
- * 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().
- */
- 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) {
- /*
- * We must re-test for readability after taking the
- * lock to protect us in the case where a new packet
- * arrives on the socket after our call to soreceive
- * fails with EWOULDBLOCK. The pool lock protects us
- * from racing the upcall after our soreadable() call
- * returns false.
- */
- SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
- if (!soreadable(xprt->xp_socket))
- xprt_inactive_self(xprt);
- SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
- sx_xunlock(&xprt->xp_lock);
- return (FALSE);
- }
- if (error) {
- SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
- soupcall_clear(xprt->xp_socket, SO_RCV);
- SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
- xprt_inactive_self(xprt);
- sx_xunlock(&xprt->xp_lock);
- return (FALSE);
- }
- sx_xunlock(&xprt->xp_lock);
- xdrmbuf_create(&xdrs, mreq, XDR_DECODE);
- if (! xdr_callmsg(&xdrs, msg)) {
- XDR_DESTROY(&xdrs);
- return (FALSE);
- }
- *addrp = raddr;
- *mp = xdrmbuf_getall(&xdrs);
- XDR_DESTROY(&xdrs);
- return (TRUE);
- }
- static bool_t
- svc_dg_reply(SVCXPRT *xprt, struct rpc_msg *msg,
- struct sockaddr *addr, struct mbuf *m, uint32_t *seq)
- {
- XDR xdrs;
- struct mbuf *mrep;
- bool_t stat = TRUE;
- int error;
- mrep = m_gethdr(M_WAITOK, MT_DATA);
- xdrmbuf_create(&xdrs, mrep, XDR_ENCODE);
- if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
- msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
- if (!xdr_replymsg(&xdrs, msg))
- stat = FALSE;
- else
- xdrmbuf_append(&xdrs, m);
- } else {
- stat = xdr_replymsg(&xdrs, msg);
- }
- if (stat) {
- m_fixhdr(mrep);
- error = sosend(xprt->xp_socket, addr, NULL, mrep, NULL,
- 0, curthread);
- if (!error) {
- stat = TRUE;
- }
- } else {
- m_freem(mrep);
- }
- XDR_DESTROY(&xdrs);
- xprt->xp_p2 = NULL;
- return (stat);
- }
- static void
- svc_dg_destroy(SVCXPRT *xprt)
- {
- SOCKBUF_LOCK(&xprt->xp_socket->so_rcv);
- soupcall_clear(xprt->xp_socket, SO_RCV);
- SOCKBUF_UNLOCK(&xprt->xp_socket->so_rcv);
- sx_destroy(&xprt->xp_lock);
- if (xprt->xp_socket)
- (void)soclose(xprt->xp_socket);
- if (xprt->xp_netid)
- (void) mem_free(xprt->xp_netid, strlen(xprt->xp_netid) + 1);
- svc_xprt_free(xprt);
- }
- static bool_t
- /*ARGSUSED*/
- svc_dg_control(xprt, rq, in)
- SVCXPRT *xprt;
- const u_int rq;
- void *in;
- {
- return (FALSE);
- }
- static int
- svc_dg_soupcall(struct socket *so, void *arg, int waitflag)
- {
- SVCXPRT *xprt = (SVCXPRT *) arg;
- xprt_active(xprt);
- return (SU_OK);
- }
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