500 lines
12 KiB
C
500 lines
12 KiB
C
/* $NetBSD: svc_udp.c,v 1.14 1998/07/26 11:47:38 mycroft Exp $ */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char *sccsid = "@(#)svc_udp.c 1.24 87/08/11 Copyr 1984 Sun Micro";
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static char *sccsid = "@(#)svc_udp.c 2.2 88/07/29 4.0 RPCSRC";
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#else
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__RCSID("$NetBSD: svc_udp.c,v 1.14 1998/07/26 11:47:38 mycroft Exp $");
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#endif
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#endif
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/*
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* svc_udp.c,
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* Server side for UDP/IP based RPC. (Does some caching in the hopes of
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* achieving execute-at-most-once semantics.)
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#include "namespace.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <rpc/rpc.h>
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#ifdef __weak_alias
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__weak_alias(svcudp_bufcreate,_svcudp_bufcreate);
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__weak_alias(svcudp_create,_svcudp_create);
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__weak_alias(svcudp_enablecache,_svcudp_enablecache);
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#endif
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#define rpc_buffer(xprt) ((xprt)->xp_p1)
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#define MAX(a, b) ((a > b) ? a : b)
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static enum xprt_stat svcudp_stat __P((SVCXPRT *));
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static bool_t svcudp_recv __P((SVCXPRT *, struct rpc_msg *));
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static bool_t svcudp_reply __P((SVCXPRT *, struct rpc_msg *));
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static bool_t svcudp_getargs __P((SVCXPRT *, xdrproc_t, caddr_t));
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static bool_t svcudp_freeargs __P((SVCXPRT *, xdrproc_t, caddr_t));
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static void svcudp_destroy __P((SVCXPRT *));
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static void cache_set __P((SVCXPRT *, u_long));
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static int cache_get __P((SVCXPRT *, struct rpc_msg *, char **, u_long *));
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static const struct xp_ops svcudp_op = {
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svcudp_recv,
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svcudp_stat,
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svcudp_getargs,
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svcudp_reply,
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svcudp_freeargs,
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svcudp_destroy
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};
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/*
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* kept in xprt->xp_p2
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*/
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struct svcudp_data {
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u_int su_iosz; /* byte size of send.recv buffer */
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u_long su_xid; /* transaction id */
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XDR su_xdrs; /* XDR handle */
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char su_verfbody[MAX_AUTH_BYTES]; /* verifier body */
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char * su_cache; /* cached data, NULL if no cache */
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};
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#define su_data(xprt) ((struct svcudp_data *)(xprt->xp_p2))
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/*
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* Usage:
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* xprt = svcudp_create(sock);
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*
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* If sock<0 then a socket is created, else sock is used.
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* If the socket, sock is not bound to a port then svcudp_create
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* binds it to an arbitrary port. In any (successful) case,
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* xprt->xp_sock is the registered socket number and xprt->xp_port is the
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* associated port number.
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* Once *xprt is initialized, it is registered as a transporter;
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* see (svc.h, xprt_register).
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* The routines returns NULL if a problem occurred.
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*/
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SVCXPRT *
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svcudp_bufcreate(sock, sendsz, recvsz)
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int sock;
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u_int sendsz, recvsz;
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{
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bool_t madesock = FALSE;
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SVCXPRT *xprt;
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struct svcudp_data *su;
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struct sockaddr_in addr;
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int len = sizeof(struct sockaddr_in);
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if (sock == RPC_ANYSOCK) {
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if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
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warnx("svcudp_create: socket creation problem");
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return ((SVCXPRT *)NULL);
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}
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madesock = TRUE;
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}
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memset(&addr, 0, sizeof (addr));
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addr.sin_len = sizeof(struct sockaddr_in);
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addr.sin_family = AF_INET;
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if (bindresvport(sock, &addr)) {
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addr.sin_port = 0;
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(void)bind(sock, (struct sockaddr *)&addr, len);
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}
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if (getsockname(sock, (struct sockaddr *)&addr, &len) != 0) {
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warnx("svcudp_create - cannot getsockname");
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if (madesock)
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(void)close(sock);
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return ((SVCXPRT *)NULL);
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}
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xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
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if (xprt == NULL) {
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warnx("svcudp_create: out of memory");
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return (NULL);
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}
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su = (struct svcudp_data *)mem_alloc(sizeof(*su));
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if (su == NULL) {
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warnx("svcudp_create: out of memory");
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return (NULL);
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}
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su->su_iosz = ((MAX(sendsz, recvsz) + 3) / 4) * 4;
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if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL) {
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warnx("svcudp_create: out of memory");
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return (NULL);
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}
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xdrmem_create(
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&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_DECODE);
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su->su_cache = NULL;
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xprt->xp_p2 = (caddr_t)su;
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xprt->xp_verf.oa_base = su->su_verfbody;
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xprt->xp_ops = &svcudp_op;
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xprt->xp_port = ntohs(addr.sin_port);
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xprt->xp_sock = sock;
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xprt_register(xprt);
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return (xprt);
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}
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SVCXPRT *
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svcudp_create(sock)
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int sock;
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{
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return(svcudp_bufcreate(sock, UDPMSGSIZE, UDPMSGSIZE));
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}
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static enum xprt_stat
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svcudp_stat(xprt)
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SVCXPRT *xprt;
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{
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return (XPRT_IDLE);
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}
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static bool_t
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svcudp_recv(xprt, msg)
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SVCXPRT *xprt;
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struct rpc_msg *msg;
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{
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struct svcudp_data *su = su_data(xprt);
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XDR *xdrs = &(su->su_xdrs);
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int rlen;
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char *reply;
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u_long replylen;
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again:
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xprt->xp_addrlen = sizeof(struct sockaddr_in);
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rlen = recvfrom(xprt->xp_sock, rpc_buffer(xprt), (int) su->su_iosz,
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0, (struct sockaddr *)&(xprt->xp_raddr), &(xprt->xp_addrlen));
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if (rlen == -1 && errno == EINTR)
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goto again;
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if (rlen == -1 || rlen < 4*sizeof(u_int32_t))
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return (FALSE);
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xdrs->x_op = XDR_DECODE;
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XDR_SETPOS(xdrs, 0);
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if (! xdr_callmsg(xdrs, msg))
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return (FALSE);
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su->su_xid = msg->rm_xid;
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if (su->su_cache != NULL) {
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if (cache_get(xprt, msg, &reply, &replylen)) {
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(void) sendto(xprt->xp_sock, reply, (int) replylen, 0,
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(struct sockaddr *) &xprt->xp_raddr, xprt->xp_addrlen);
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return (TRUE);
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}
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}
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return (TRUE);
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}
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static bool_t
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svcudp_reply(xprt, msg)
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SVCXPRT *xprt;
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struct rpc_msg *msg;
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{
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struct svcudp_data *su = su_data(xprt);
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XDR *xdrs = &(su->su_xdrs);
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int slen;
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bool_t stat = FALSE;
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xdrs->x_op = XDR_ENCODE;
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XDR_SETPOS(xdrs, 0);
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msg->rm_xid = su->su_xid;
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if (xdr_replymsg(xdrs, msg)) {
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slen = (int)XDR_GETPOS(xdrs);
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if (sendto(xprt->xp_sock, rpc_buffer(xprt), slen, 0,
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(struct sockaddr *)&(xprt->xp_raddr), xprt->xp_addrlen)
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== slen) {
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stat = TRUE;
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if (su->su_cache && slen >= 0) {
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cache_set(xprt, (u_long) slen);
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}
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}
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}
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return (stat);
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}
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static bool_t
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svcudp_getargs(xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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caddr_t args_ptr;
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{
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return ((*xdr_args)(&(su_data(xprt)->su_xdrs), args_ptr));
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}
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static bool_t
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svcudp_freeargs(xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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caddr_t args_ptr;
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{
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XDR *xdrs = &(su_data(xprt)->su_xdrs);
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xdrs->x_op = XDR_FREE;
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return ((*xdr_args)(xdrs, args_ptr));
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}
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static void
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svcudp_destroy(xprt)
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SVCXPRT *xprt;
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{
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struct svcudp_data *su = su_data(xprt);
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xprt_unregister(xprt);
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(void)close(xprt->xp_sock);
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XDR_DESTROY(&(su->su_xdrs));
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mem_free(rpc_buffer(xprt), su->su_iosz);
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mem_free((caddr_t)su, sizeof(struct svcudp_data));
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mem_free((caddr_t)xprt, sizeof(SVCXPRT));
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}
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/***********this could be a separate file*********************/
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/*
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* Fifo cache for udp server
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* Copies pointers to reply buffers into fifo cache
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* Buffers are sent again if retransmissions are detected.
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*/
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#define SPARSENESS 4 /* 75% sparse */
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#define CACHE_PERROR(msg) \
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warnx("%s", msg)
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#define ALLOC(type, size) \
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(type *) mem_alloc((unsigned) (sizeof(type) * (size)))
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#define BZERO(addr, type, size) \
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memset((char *) addr, 0, sizeof(type) * (int) (size))
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/*
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* An entry in the cache
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*/
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typedef struct cache_node *cache_ptr;
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struct cache_node {
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/*
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* Index into cache is xid, proc, vers, prog and address
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*/
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u_long cache_xid;
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u_long cache_proc;
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u_long cache_vers;
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u_long cache_prog;
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struct sockaddr_in cache_addr;
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/*
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* The cached reply and length
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*/
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char * cache_reply;
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u_long cache_replylen;
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/*
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* Next node on the list, if there is a collision
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*/
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cache_ptr cache_next;
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};
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/*
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* The entire cache
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*/
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struct udp_cache {
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u_long uc_size; /* size of cache */
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cache_ptr *uc_entries; /* hash table of entries in cache */
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cache_ptr *uc_fifo; /* fifo list of entries in cache */
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u_long uc_nextvictim; /* points to next victim in fifo list */
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u_long uc_prog; /* saved program number */
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u_long uc_vers; /* saved version number */
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u_long uc_proc; /* saved procedure number */
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struct sockaddr_in uc_addr; /* saved caller's address */
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};
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/*
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* the hashing function
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*/
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#define CACHE_LOC(transp, xid) \
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(xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size))
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/*
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* Enable use of the cache.
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* Note: there is no disable.
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*/
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int
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svcudp_enablecache(transp, size)
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SVCXPRT *transp;
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u_long size;
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{
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struct svcudp_data *su = su_data(transp);
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struct udp_cache *uc;
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if (su->su_cache != NULL) {
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CACHE_PERROR("enablecache: cache already enabled");
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return(0);
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}
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uc = ALLOC(struct udp_cache, 1);
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if (uc == NULL) {
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CACHE_PERROR("enablecache: could not allocate cache");
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return(0);
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}
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uc->uc_size = size;
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uc->uc_nextvictim = 0;
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uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS);
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if (uc->uc_entries == NULL) {
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CACHE_PERROR("enablecache: could not allocate cache data");
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return(0);
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}
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BZERO(uc->uc_entries, cache_ptr, size * SPARSENESS);
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uc->uc_fifo = ALLOC(cache_ptr, size);
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if (uc->uc_fifo == NULL) {
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CACHE_PERROR("enablecache: could not allocate cache fifo");
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return(0);
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}
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BZERO(uc->uc_fifo, cache_ptr, size);
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su->su_cache = (char *) uc;
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return(1);
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}
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/*
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* Set an entry in the cache
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*/
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static void
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cache_set(xprt, replylen)
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SVCXPRT *xprt;
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u_long replylen;
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{
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cache_ptr victim;
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cache_ptr *vicp;
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struct svcudp_data *su = su_data(xprt);
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struct udp_cache *uc = (struct udp_cache *) su->su_cache;
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u_int loc;
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char *newbuf;
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/*
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* Find space for the new entry, either by
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* reusing an old entry, or by mallocing a new one
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*/
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victim = uc->uc_fifo[uc->uc_nextvictim];
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if (victim != NULL) {
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loc = CACHE_LOC(xprt, victim->cache_xid);
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for (vicp = &uc->uc_entries[loc];
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*vicp != NULL && *vicp != victim;
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vicp = &(*vicp)->cache_next)
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;
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if (*vicp == NULL) {
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CACHE_PERROR("cache_set: victim not found");
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return;
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}
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*vicp = victim->cache_next; /* remote from cache */
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newbuf = victim->cache_reply;
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} else {
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victim = ALLOC(struct cache_node, 1);
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if (victim == NULL) {
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CACHE_PERROR("cache_set: victim alloc failed");
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return;
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}
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newbuf = mem_alloc(su->su_iosz);
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if (newbuf == NULL) {
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CACHE_PERROR("cache_set: could not allocate new rpc_buffer");
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return;
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}
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}
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/*
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* Store it away
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*/
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victim->cache_replylen = replylen;
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victim->cache_reply = rpc_buffer(xprt);
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rpc_buffer(xprt) = newbuf;
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xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_ENCODE);
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victim->cache_xid = su->su_xid;
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victim->cache_proc = uc->uc_proc;
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victim->cache_vers = uc->uc_vers;
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victim->cache_prog = uc->uc_prog;
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victim->cache_addr = uc->uc_addr;
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loc = CACHE_LOC(xprt, victim->cache_xid);
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victim->cache_next = uc->uc_entries[loc];
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uc->uc_entries[loc] = victim;
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uc->uc_fifo[uc->uc_nextvictim++] = victim;
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uc->uc_nextvictim %= uc->uc_size;
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}
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/*
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* Try to get an entry from the cache
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* return 1 if found, 0 if not found
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*/
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static int
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cache_get(xprt, msg, replyp, replylenp)
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SVCXPRT *xprt;
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struct rpc_msg *msg;
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char **replyp;
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u_long *replylenp;
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{
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u_int loc;
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cache_ptr ent;
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struct svcudp_data *su = su_data(xprt);
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struct udp_cache *uc = (struct udp_cache *) su->su_cache;
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# define EQADDR(a1, a2) (memcmp(&a1, &a2, sizeof(a1)) == 0)
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loc = CACHE_LOC(xprt, su->su_xid);
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for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) {
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if (ent->cache_xid == su->su_xid &&
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ent->cache_proc == uc->uc_proc &&
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ent->cache_vers == uc->uc_vers &&
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ent->cache_prog == uc->uc_prog &&
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EQADDR(ent->cache_addr, uc->uc_addr)) {
|
|
*replyp = ent->cache_reply;
|
|
*replylenp = ent->cache_replylen;
|
|
return(1);
|
|
}
|
|
}
|
|
/*
|
|
* Failed to find entry
|
|
* Remember a few things so we can do a set later
|
|
*/
|
|
uc->uc_proc = msg->rm_call.cb_proc;
|
|
uc->uc_vers = msg->rm_call.cb_vers;
|
|
uc->uc_prog = msg->rm_call.cb_prog;
|
|
uc->uc_addr = xprt->xp_raddr;
|
|
return(0);
|
|
}
|
|
|