604 lines
16 KiB
C
604 lines
16 KiB
C
/* $NetBSD: svc_dg.c,v 1.4 2000/07/06 03:10:35 christos 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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/*
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* Copyright (c) 1986-1991 by Sun Microsystems Inc.
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*/
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/* #ident "@(#)svc_dg.c 1.17 94/04/24 SMI" */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* svc_dg.c, Server side for connectionless RPC.
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*
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* Does some caching in the hopes of achieving execute-at-most-once semantics.
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*/
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#include "namespace.h"
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#include "reentrant.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <rpc/rpc.h>
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#include <rpc/svc_dg.h>
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#include <errno.h>
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#include <unistd.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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#ifdef RPC_CACHE_DEBUG
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#include <netconfig.h>
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#include <netdir.h>
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#endif
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#include <err.h>
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#include "un-namespace.h"
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#include "rpc_com.h"
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#define su_data(xprt) ((struct svc_dg_data *)(xprt->xp_p2))
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#define rpc_buffer(xprt) ((xprt)->xp_p1)
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#ifndef MAX
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#define MAX(a, b) (((a) > (b)) ? (a) : (b))
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#endif
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static void svc_dg_ops(SVCXPRT *);
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static enum xprt_stat svc_dg_stat(SVCXPRT *);
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static bool_t svc_dg_recv(SVCXPRT *, struct rpc_msg *);
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static bool_t svc_dg_reply(SVCXPRT *, struct rpc_msg *);
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static bool_t svc_dg_getargs(SVCXPRT *, xdrproc_t, void *);
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static bool_t svc_dg_freeargs(SVCXPRT *, xdrproc_t, void *);
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static void svc_dg_destroy(SVCXPRT *);
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static bool_t svc_dg_control(SVCXPRT *, const u_int, void *);
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static int cache_get(SVCXPRT *, struct rpc_msg *, char **, size_t *);
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static void cache_set(SVCXPRT *, size_t);
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int svc_dg_enablecache(SVCXPRT *, u_int);
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/*
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* Usage:
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* xprt = svc_dg_create(sock, sendsize, recvsize);
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* Does other connectionless specific initializations.
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* Once *xprt is initialized, it is registered.
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* see (svc.h, xprt_register). If recvsize or sendsize are 0 suitable
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* system defaults are chosen.
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* The routines returns NULL if a problem occurred.
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*/
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static const char svc_dg_str[] = "svc_dg_create: %s";
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static const char svc_dg_err1[] = "could not get transport information";
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static const char svc_dg_err2[] = " transport does not support data transfer";
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static const char __no_mem_str[] = "out of memory";
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SVCXPRT *
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svc_dg_create(fd, sendsize, recvsize)
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int fd;
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u_int sendsize;
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u_int recvsize;
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{
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SVCXPRT *xprt;
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struct svc_dg_data *su = NULL;
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struct __rpc_sockinfo si;
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struct sockaddr_storage ss;
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socklen_t slen;
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if (!__rpc_fd2sockinfo(fd, &si)) {
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warnx(svc_dg_str, svc_dg_err1);
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return (NULL);
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}
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/*
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* Find the receive and the send size
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*/
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sendsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsize);
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recvsize = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsize);
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if ((sendsize == 0) || (recvsize == 0)) {
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warnx(svc_dg_str, svc_dg_err2);
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return (NULL);
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}
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xprt = mem_alloc(sizeof (SVCXPRT));
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if (xprt == NULL)
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goto freedata;
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memset(xprt, 0, sizeof (SVCXPRT));
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su = mem_alloc(sizeof (*su));
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if (su == NULL)
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goto freedata;
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su->su_iosz = ((MAX(sendsize, recvsize) + 3) / 4) * 4;
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if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL)
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goto freedata;
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xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz,
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XDR_DECODE);
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su->su_cache = NULL;
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xprt->xp_fd = fd;
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xprt->xp_p2 = su;
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xprt->xp_verf.oa_base = su->su_verfbody;
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svc_dg_ops(xprt);
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xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
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slen = sizeof ss;
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if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
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goto freedata;
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xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
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xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
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xprt->xp_ltaddr.len = slen;
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memcpy(xprt->xp_ltaddr.buf, &ss, slen);
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xprt_register(xprt);
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return (xprt);
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freedata:
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(void) warnx(svc_dg_str, __no_mem_str);
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if (xprt) {
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if (su)
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(void) mem_free(su, sizeof (*su));
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(void) mem_free(xprt, sizeof (SVCXPRT));
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}
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return (NULL);
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}
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/*ARGSUSED*/
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static enum xprt_stat
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svc_dg_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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svc_dg_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 svc_dg_data *su = su_data(xprt);
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XDR *xdrs = &(su->su_xdrs);
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char *reply;
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struct sockaddr_storage ss;
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socklen_t alen;
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size_t replylen;
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int rlen;
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again:
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alen = sizeof (struct sockaddr_storage);
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rlen = _recvfrom(xprt->xp_fd, rpc_buffer(xprt), su->su_iosz, 0,
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(struct sockaddr *)(void *)&ss, &alen);
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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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if (xprt->xp_rtaddr.len < alen) {
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if (xprt->xp_rtaddr.len != 0)
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mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.len);
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xprt->xp_rtaddr.buf = mem_alloc(alen);
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xprt->xp_rtaddr.len = alen;
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}
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memcpy(xprt->xp_rtaddr.buf, &ss, alen);
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#ifdef PORTMAP
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if (ss.ss_family == AF_INET) {
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xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf;
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xprt->xp_addrlen = sizeof (struct sockaddr_in);
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}
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#endif /* PORTMAP */
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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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}
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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_fd, reply, replylen, 0,
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(struct sockaddr *)(void *)&ss, alen);
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return (FALSE);
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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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svc_dg_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 svc_dg_data *su = su_data(xprt);
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XDR *xdrs = &(su->su_xdrs);
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bool_t stat = FALSE;
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size_t slen;
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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 = XDR_GETPOS(xdrs);
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if (_sendto(xprt->xp_fd, rpc_buffer(xprt), slen, 0,
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(struct sockaddr *)xprt->xp_rtaddr.buf,
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(socklen_t)xprt->xp_rtaddr.len) == slen) {
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stat = TRUE;
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if (su->su_cache)
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cache_set(xprt, slen);
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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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svc_dg_getargs(xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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void *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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svc_dg_freeargs(xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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void *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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svc_dg_destroy(xprt)
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SVCXPRT *xprt;
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{
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struct svc_dg_data *su = su_data(xprt);
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xprt_unregister(xprt);
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if (xprt->xp_fd != -1)
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(void)_close(xprt->xp_fd);
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XDR_DESTROY(&(su->su_xdrs));
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(void) mem_free(rpc_buffer(xprt), su->su_iosz);
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(void) mem_free(su, sizeof (*su));
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if (xprt->xp_rtaddr.buf)
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(void) mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.maxlen);
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if (xprt->xp_ltaddr.buf)
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(void) mem_free(xprt->xp_ltaddr.buf, xprt->xp_ltaddr.maxlen);
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if (xprt->xp_tp)
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(void) free(xprt->xp_tp);
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(void) mem_free(xprt, sizeof (SVCXPRT));
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}
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static bool_t
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/*ARGSUSED*/
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svc_dg_control(xprt, rq, in)
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SVCXPRT *xprt;
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const u_int rq;
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void *in;
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{
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return (FALSE);
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}
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static void
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svc_dg_ops(xprt)
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SVCXPRT *xprt;
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{
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static struct xp_ops ops;
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static struct xp_ops2 ops2;
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extern mutex_t ops_lock;
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/* VARIABLES PROTECTED BY ops_lock: ops */
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mutex_lock(&ops_lock);
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if (ops.xp_recv == NULL) {
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ops.xp_recv = svc_dg_recv;
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ops.xp_stat = svc_dg_stat;
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ops.xp_getargs = svc_dg_getargs;
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ops.xp_reply = svc_dg_reply;
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ops.xp_freeargs = svc_dg_freeargs;
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ops.xp_destroy = svc_dg_destroy;
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ops2.xp_control = svc_dg_control;
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}
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xprt->xp_ops = &ops;
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xprt->xp_ops2 = &ops2;
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mutex_unlock(&ops_lock);
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}
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/* The CACHING COMPONENT */
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/*
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* Could have been a separate file, but some part of it depends upon the
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* private structure of the client handle.
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*
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* Fifo cache for cl 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 ALLOC(type, size) \
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(type *) mem_alloc((sizeof (type) * (size)))
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#define MEMZERO(addr, type, size) \
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(void) memset((void *) (addr), 0, sizeof (type) * (int) (size))
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#define FREE(addr, type, size) \
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mem_free((addr), (sizeof (type) * (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_int32_t cache_xid;
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rpcproc_t cache_proc;
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rpcvers_t cache_vers;
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rpcprog_t cache_prog;
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struct netbuf 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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size_t 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 cl_cache {
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u_int 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_int uc_nextvictim; /* points to next victim in fifo list */
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rpcprog_t uc_prog; /* saved program number */
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rpcvers_t uc_vers; /* saved version number */
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rpcproc_t uc_proc; /* saved procedure number */
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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 cl_cache *) \
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su_data(transp)->su_cache)->uc_size))
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extern mutex_t dupreq_lock;
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/*
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* Enable use of the cache. Returns 1 on success, 0 on failure.
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* Note: there is no disable.
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*/
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static const char cache_enable_str[] = "svc_enablecache: %s %s";
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static const char alloc_err[] = "could not allocate cache ";
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static const char enable_err[] = "cache already enabled";
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int
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svc_dg_enablecache(transp, size)
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SVCXPRT *transp;
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u_int size;
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{
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struct svc_dg_data *su = su_data(transp);
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struct cl_cache *uc;
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mutex_lock(&dupreq_lock);
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if (su->su_cache != NULL) {
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(void) warnx(cache_enable_str, enable_err, " ");
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mutex_unlock(&dupreq_lock);
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return (0);
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}
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uc = ALLOC(struct cl_cache, 1);
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if (uc == NULL) {
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warnx(cache_enable_str, alloc_err, " ");
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mutex_unlock(&dupreq_lock);
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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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warnx(cache_enable_str, alloc_err, "data");
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FREE(uc, struct cl_cache, 1);
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mutex_unlock(&dupreq_lock);
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return (0);
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}
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MEMZERO(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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warnx(cache_enable_str, alloc_err, "fifo");
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FREE(uc->uc_entries, cache_ptr, size * SPARSENESS);
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FREE(uc, struct cl_cache, 1);
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mutex_unlock(&dupreq_lock);
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return (0);
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}
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MEMZERO(uc->uc_fifo, cache_ptr, size);
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su->su_cache = (char *)(void *)uc;
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mutex_unlock(&dupreq_lock);
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return (1);
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}
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/*
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* Set an entry in the cache. It assumes that the uc entry is set from
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* the earlier call to cache_get() for the same procedure. This will always
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* happen because cache_get() is calle by svc_dg_recv and cache_set() is called
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* by svc_dg_reply(). All this hoopla because the right RPC parameters are
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* not available at svc_dg_reply time.
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*/
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static const char cache_set_str[] = "cache_set: %s";
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static const char cache_set_err1[] = "victim not found";
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static const char cache_set_err2[] = "victim alloc failed";
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static const char cache_set_err3[] = "could not allocate new rpc buffer";
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static void
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cache_set(xprt, replylen)
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SVCXPRT *xprt;
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size_t replylen;
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{
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cache_ptr victim;
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cache_ptr *vicp;
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struct svc_dg_data *su = su_data(xprt);
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struct cl_cache *uc = (struct cl_cache *) su->su_cache;
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u_int loc;
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char *newbuf;
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#ifdef RPC_CACHE_DEBUG
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struct netconfig *nconf;
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char *uaddr;
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#endif
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mutex_lock(&dupreq_lock);
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/*
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|
* Find space for the new entry, either by
|
|
* reusing an old entry, or by mallocing a new one
|
|
*/
|
|
victim = uc->uc_fifo[uc->uc_nextvictim];
|
|
if (victim != NULL) {
|
|
loc = CACHE_LOC(xprt, victim->cache_xid);
|
|
for (vicp = &uc->uc_entries[loc];
|
|
*vicp != NULL && *vicp != victim;
|
|
vicp = &(*vicp)->cache_next)
|
|
;
|
|
if (*vicp == NULL) {
|
|
warnx(cache_set_str, cache_set_err1);
|
|
mutex_unlock(&dupreq_lock);
|
|
return;
|
|
}
|
|
*vicp = victim->cache_next; /* remove from cache */
|
|
newbuf = victim->cache_reply;
|
|
} else {
|
|
victim = ALLOC(struct cache_node, 1);
|
|
if (victim == NULL) {
|
|
warnx(cache_set_str, cache_set_err2);
|
|
mutex_unlock(&dupreq_lock);
|
|
return;
|
|
}
|
|
newbuf = mem_alloc(su->su_iosz);
|
|
if (newbuf == NULL) {
|
|
warnx(cache_set_str, cache_set_err3);
|
|
FREE(victim, struct cache_node, 1);
|
|
mutex_unlock(&dupreq_lock);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Store it away
|
|
*/
|
|
#ifdef RPC_CACHE_DEBUG
|
|
if (nconf = getnetconfigent(xprt->xp_netid)) {
|
|
uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr);
|
|
freenetconfigent(nconf);
|
|
printf(
|
|
"cache set for xid= %x prog=%d vers=%d proc=%d for rmtaddr=%s\n",
|
|
su->su_xid, uc->uc_prog, uc->uc_vers,
|
|
uc->uc_proc, uaddr);
|
|
free(uaddr);
|
|
}
|
|
#endif
|
|
victim->cache_replylen = replylen;
|
|
victim->cache_reply = rpc_buffer(xprt);
|
|
rpc_buffer(xprt) = newbuf;
|
|
xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt),
|
|
su->su_iosz, XDR_ENCODE);
|
|
victim->cache_xid = su->su_xid;
|
|
victim->cache_proc = uc->uc_proc;
|
|
victim->cache_vers = uc->uc_vers;
|
|
victim->cache_prog = uc->uc_prog;
|
|
victim->cache_addr = xprt->xp_rtaddr;
|
|
victim->cache_addr.buf = ALLOC(char, xprt->xp_rtaddr.len);
|
|
(void) memcpy(victim->cache_addr.buf, xprt->xp_rtaddr.buf,
|
|
(size_t)xprt->xp_rtaddr.len);
|
|
loc = CACHE_LOC(xprt, victim->cache_xid);
|
|
victim->cache_next = uc->uc_entries[loc];
|
|
uc->uc_entries[loc] = victim;
|
|
uc->uc_fifo[uc->uc_nextvictim++] = victim;
|
|
uc->uc_nextvictim %= uc->uc_size;
|
|
mutex_unlock(&dupreq_lock);
|
|
}
|
|
|
|
/*
|
|
* Try to get an entry from the cache
|
|
* return 1 if found, 0 if not found and set the stage for cache_set()
|
|
*/
|
|
static int
|
|
cache_get(xprt, msg, replyp, replylenp)
|
|
SVCXPRT *xprt;
|
|
struct rpc_msg *msg;
|
|
char **replyp;
|
|
size_t *replylenp;
|
|
{
|
|
u_int loc;
|
|
cache_ptr ent;
|
|
struct svc_dg_data *su = su_data(xprt);
|
|
struct cl_cache *uc = (struct cl_cache *) su->su_cache;
|
|
#ifdef RPC_CACHE_DEBUG
|
|
struct netconfig *nconf;
|
|
char *uaddr;
|
|
#endif
|
|
|
|
mutex_lock(&dupreq_lock);
|
|
loc = CACHE_LOC(xprt, su->su_xid);
|
|
for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next) {
|
|
if (ent->cache_xid == su->su_xid &&
|
|
ent->cache_proc == msg->rm_call.cb_proc &&
|
|
ent->cache_vers == msg->rm_call.cb_vers &&
|
|
ent->cache_prog == msg->rm_call.cb_prog &&
|
|
ent->cache_addr.len == xprt->xp_rtaddr.len &&
|
|
(memcmp(ent->cache_addr.buf, xprt->xp_rtaddr.buf,
|
|
xprt->xp_rtaddr.len) == 0)) {
|
|
#ifdef RPC_CACHE_DEBUG
|
|
if (nconf = getnetconfigent(xprt->xp_netid)) {
|
|
uaddr = taddr2uaddr(nconf, &xprt->xp_rtaddr);
|
|
freenetconfigent(nconf);
|
|
printf(
|
|
"cache entry found for xid=%x prog=%d vers=%d proc=%d for rmtaddr=%s\n",
|
|
su->su_xid, msg->rm_call.cb_prog,
|
|
msg->rm_call.cb_vers,
|
|
msg->rm_call.cb_proc, uaddr);
|
|
free(uaddr);
|
|
}
|
|
#endif
|
|
*replyp = ent->cache_reply;
|
|
*replylenp = ent->cache_replylen;
|
|
mutex_unlock(&dupreq_lock);
|
|
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;
|
|
mutex_unlock(&dupreq_lock);
|
|
return (0);
|
|
}
|