1 files changed, 603 insertions, 0 deletions

diff --git a/lib/libc/rpc/svc_dg.c b/lib/libc/rpc/svc_dg.c
new file mode 100644
index 0000000..1c602bc
--- /dev/null
+++ b/lib/libc/rpc/svc_dg.c
@@ -0,0 +1,603 @@
+/*	$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.
+ *
+ * Does some caching in the hopes of achieving execute-at-most-once semantics.
+ */
+
+#include "namespace.h"
+#include "reentrant.h"
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <rpc/rpc.h>
+#include <rpc/svc_dg.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef RPC_CACHE_DEBUG
+#include <netconfig.h>
+#include <netdir.h>
+#endif
+#include <err.h>
+#include "un-namespace.h"
+
+#include "rpc_com.h"
+#include "mt_misc.h"
+
+#define	su_data(xprt)	((struct svc_dg_data *)(xprt->xp_p2))
+#define	rpc_buffer(xprt) ((xprt)->xp_p1)
+
+#ifndef MAX
+#define	MAX(a, b)	(((a) > (b)) ? (a) : (b))
+#endif
+
+static void svc_dg_ops(SVCXPRT *);
+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 int cache_get(SVCXPRT *, struct rpc_msg *, char **, size_t *);
+static void cache_set(SVCXPRT *, size_t);
+int svc_dg_enablecache(SVCXPRT *, u_int);
+
+/*
+ * 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(fd, sendsize, recvsize)
+	int fd;
+	u_int sendsize;
+	u_int recvsize;
+{
+	SVCXPRT *xprt;
+	struct svc_dg_data *su = NULL;
+	struct __rpc_sockinfo si;
+	struct sockaddr_storage ss;
+	socklen_t slen;
+
+	if (!__rpc_fd2sockinfo(fd, &si)) {
+		warnx(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)) {
+		warnx(svc_dg_str, svc_dg_err2);
+		return (NULL);
+	}
+
+	xprt = mem_alloc(sizeof (SVCXPRT));
+	if (xprt == NULL)
+		goto freedata;
+	memset(xprt, 0, sizeof (SVCXPRT));
+
+	su = mem_alloc(sizeof (*su));
+	if (su == NULL)
+		goto freedata;
+	su->su_iosz = ((MAX(sendsize, recvsize) + 3) / 4) * 4;
+	if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL)
+		goto freedata;
+	xdrmem_create(&(su->su_xdrs), rpc_buffer(xprt), su->su_iosz,
+		XDR_DECODE);
+	su->su_cache = NULL;
+	xprt->xp_fd = fd;
+	xprt->xp_p2 = su;
+	xprt->xp_verf.oa_base = su->su_verfbody;
+	svc_dg_ops(xprt);
+	xprt->xp_rtaddr.maxlen = sizeof (struct sockaddr_storage);
+
+	slen = sizeof ss;
+	if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
+		goto freedata;
+	xprt->xp_ltaddr.buf = mem_alloc(sizeof (struct sockaddr_storage));
+	xprt->xp_ltaddr.maxlen = sizeof (struct sockaddr_storage);
+	xprt->xp_ltaddr.len = slen;
+	memcpy(xprt->xp_ltaddr.buf, &ss, slen);
+
+	xprt_register(xprt);
+	return (xprt);
+freedata:
+	(void) warnx(svc_dg_str, __no_mem_str);
+	if (xprt) {
+		if (su)
+			(void) mem_free(su, sizeof (*su));
+		(void) mem_free(xprt, sizeof (SVCXPRT));
+	}
+	return (NULL);
+}
+
+/*ARGSUSED*/
+static enum xprt_stat
+svc_dg_stat(xprt)
+	SVCXPRT *xprt;
+{
+	return (XPRT_IDLE);
+}
+
+static bool_t
+svc_dg_recv(xprt, msg)
+	SVCXPRT *xprt;
+	struct rpc_msg *msg;
+{
+	struct svc_dg_data *su = su_data(xprt);
+	XDR *xdrs = &(su->su_xdrs);
+	char *reply;
+	struct sockaddr_storage ss;
+	socklen_t alen;
+	size_t replylen;
+	ssize_t rlen;
+
+again:
+	alen = sizeof (struct sockaddr_storage);
+	rlen = _recvfrom(xprt->xp_fd, rpc_buffer(xprt), su->su_iosz, 0,
+	    (struct sockaddr *)(void *)&ss, &alen);
+	if (rlen == -1 && errno == EINTR)
+		goto again;
+	if (rlen == -1 || (rlen < (ssize_t)(4 * sizeof (u_int32_t))))
+		return (FALSE);
+	if (xprt->xp_rtaddr.len < alen) {
+		if (xprt->xp_rtaddr.len != 0)
+			mem_free(xprt->xp_rtaddr.buf, xprt->xp_rtaddr.len);
+		xprt->xp_rtaddr.buf = mem_alloc(alen);
+		xprt->xp_rtaddr.len = alen;
+	}
+	memcpy(xprt->xp_rtaddr.buf, &ss, alen);
+#ifdef PORTMAP
+	if (ss.ss_family == AF_INET) {
+		xprt->xp_raddr = *(struct sockaddr_in *)xprt->xp_rtaddr.buf;
+		xprt->xp_addrlen = sizeof (struct sockaddr_in);
+	}
+#endif				/* PORTMAP */
+	xdrs->x_op = XDR_DECODE;
+	XDR_SETPOS(xdrs, 0);
+	if (! xdr_callmsg(xdrs, msg)) {
+		return (FALSE);
+	}
+	su->su_xid = msg->rm_xid;
+	if (su->su_cache != NULL) {
+		if (cache_get(xprt, msg, &reply, &replylen)) {
+			(void)_sendto(xprt->xp_fd, reply, replylen, 0,
+			    (struct sockaddr *)(void *)&ss, alen);
+			return (FALSE);
+		}
+	}
+	return (TRUE);
+}
+
+static bool_t
+svc_dg_reply(xprt, msg)
+	SVCXPRT *xprt;
+	struct rpc_msg *msg;
+{
+	struct svc_dg_data *su = su_data(xprt);
+	XDR *xdrs = &(su->su_xdrs);
+	bool_t stat = FALSE;
+	size_t slen;
+
+	xdrs->x_op = XDR_ENCODE;
+	XDR_SETPOS(xdrs, 0);
+	msg->rm_xid = su->su_xid;
+	if (xdr_replymsg(xdrs, msg)) {
+		slen = XDR_GETPOS(xdrs);
+		if (_sendto(xprt->xp_fd, rpc_buffer(xprt), slen, 0,
+		    (struct sockaddr *)xprt->xp_rtaddr.buf,
+		    (socklen_t)xprt->xp_rtaddr.len) == (ssize_t) slen) {
+			stat = TRUE;
+			if (su->su_cache)
+				cache_set(xprt, slen);
+		}
+	}
+	return (stat);
+}
+
+static bool_t
+svc_dg_getargs(xprt, xdr_args, args_ptr)
+	SVCXPRT *xprt;
+	xdrproc_t xdr_args;
+	void *args_ptr;
+{
+	return (*xdr_args)(&(su_data(xprt)->su_xdrs), args_ptr);
+}
+
+static bool_t
+svc_dg_freeargs(xprt, xdr_args, args_ptr)
+	SVCXPRT *xprt;
+	xdrproc_t xdr_args;
+	void *args_ptr;
+{
+	XDR *xdrs = &(su_data(xprt)->su_xdrs);
+
+	xdrs->x_op = XDR_FREE;
+	return (*xdr_args)(xdrs, args_ptr);
+}
+
+static void
+svc_dg_destroy(xprt)
+	SVCXPRT *xprt;
+{
+	struct svc_dg_data *su = su_data(xprt);
+
+	xprt_unregister(xprt);
+	if (xprt->xp_fd != -1)
+		(void)_close(xprt->xp_fd);
+	XDR_DESTROY(&(su->su_xdrs));
+	(void) mem_free(rpc_buffer(xprt), su->su_iosz);
+	(void) mem_free(su, sizeof (*su));
+	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);
+	if (xprt->xp_tp)
+		(void) free(xprt->xp_tp);
+	(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_ops(xprt)
+	SVCXPRT *xprt;
+{
+	static struct xp_ops ops;
+	static struct xp_ops2 ops2;
+
+/* VARIABLES PROTECTED BY ops_lock: ops */
+
+	mutex_lock(&ops_lock);
+	if (ops.xp_recv == NULL) {
+		ops.xp_recv = svc_dg_recv;
+		ops.xp_stat = svc_dg_stat;
+		ops.xp_getargs = svc_dg_getargs;
+		ops.xp_reply = svc_dg_reply;
+		ops.xp_freeargs = svc_dg_freeargs;
+		ops.xp_destroy = svc_dg_destroy;
+		ops2.xp_control = svc_dg_control;
+	}
+	xprt->xp_ops = &ops;
+	xprt->xp_ops2 = &ops2;
+	mutex_unlock(&ops_lock);
+}
+
+/*  The CACHING COMPONENT */
+
+/*
+ * Could have been a separate file, but some part of it depends upon the
+ * private structure of the client handle.
+ *
+ * Fifo cache for cl server
+ * Copies pointers to reply buffers into fifo cache
+ * Buffers are sent again if retransmissions are detected.
+ */
+
+#define	SPARSENESS 4	/* 75% sparse */
+
+#define	ALLOC(type, size)	\
+	(type *) mem_alloc((sizeof (type) * (size)))
+
+#define	MEMZERO(addr, type, size)	 \
+	(void) memset((void *) (addr), 0, sizeof (type) * (int) (size))
+
+#define	FREE(addr, type, size)	\
+	mem_free((addr), (sizeof (type) * (size)))
+
+/*
+ * An entry in the cache
+ */
+typedef struct cache_node *cache_ptr;
+struct cache_node {
+	/*
+	 * Index into cache is xid, proc, vers, prog and address
+	 */
+	u_int32_t cache_xid;
+	rpcproc_t cache_proc;
+	rpcvers_t cache_vers;
+	rpcprog_t cache_prog;
+	struct netbuf cache_addr;
+	/*
+	 * The cached reply and length
+	 */
+	char *cache_reply;
+	size_t cache_replylen;
+	/*
+	 * Next node on the list, if there is a collision
+	 */
+	cache_ptr cache_next;
+};
+
+/*
+ * The entire cache
+ */
+struct cl_cache {
+	u_int uc_size;		/* size of cache */
+	cache_ptr *uc_entries;	/* hash table of entries in cache */
+	cache_ptr *uc_fifo;	/* fifo list of entries in cache */
+	u_int uc_nextvictim;	/* points to next victim in fifo list */
+	rpcprog_t uc_prog;	/* saved program number */
+	rpcvers_t uc_vers;	/* saved version number */
+	rpcproc_t uc_proc;	/* saved procedure number */
+};
+
+
+/*
+ * the hashing function
+ */
+#define	CACHE_LOC(transp, xid)	\
+	(xid % (SPARSENESS * ((struct cl_cache *) \
+		su_data(transp)->su_cache)->uc_size))
+
+/*
+ * Enable use of the cache. Returns 1 on success, 0 on failure.
+ * Note: there is no disable.
+ */
+static const char cache_enable_str[] = "svc_enablecache: %s %s";
+static const char alloc_err[] = "could not allocate cache ";
+static const char enable_err[] = "cache already enabled";
+
+int
+svc_dg_enablecache(transp, size)
+	SVCXPRT *transp;
+	u_int size;
+{
+	struct svc_dg_data *su = su_data(transp);
+	struct cl_cache *uc;
+
+	mutex_lock(&dupreq_lock);
+	if (su->su_cache != NULL) {
+		(void) warnx(cache_enable_str, enable_err, " ");
+		mutex_unlock(&dupreq_lock);
+		return (0);
+	}
+	uc = ALLOC(struct cl_cache, 1);
+	if (uc == NULL) {
+		warnx(cache_enable_str, alloc_err, " ");
+		mutex_unlock(&dupreq_lock);
+		return (0);
+	}
+	uc->uc_size = size;
+	uc->uc_nextvictim = 0;
+	uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS);
+	if (uc->uc_entries == NULL) {
+		warnx(cache_enable_str, alloc_err, "data");
+		FREE(uc, struct cl_cache, 1);
+		mutex_unlock(&dupreq_lock);
+		return (0);
+	}
+	MEMZERO(uc->uc_entries, cache_ptr, size * SPARSENESS);
+	uc->uc_fifo = ALLOC(cache_ptr, size);
+	if (uc->uc_fifo == NULL) {
+		warnx(cache_enable_str, alloc_err, "fifo");
+		FREE(uc->uc_entries, cache_ptr, size * SPARSENESS);
+		FREE(uc, struct cl_cache, 1);
+		mutex_unlock(&dupreq_lock);
+		return (0);
+	}
+	MEMZERO(uc->uc_fifo, cache_ptr, size);
+	su->su_cache = (char *)(void *)uc;
+	mutex_unlock(&dupreq_lock);
+	return (1);
+}
+
+/*
+ * Set an entry in the cache.  It assumes that the uc entry is set from
+ * the earlier call to cache_get() for the same procedure.  This will always
+ * happen because cache_get() is calle by svc_dg_recv and cache_set() is called
+ * by svc_dg_reply().  All this hoopla because the right RPC parameters are
+ * not available at svc_dg_reply time.
+ */
+
+static const char cache_set_str[] = "cache_set: %s";
+static const char cache_set_err1[] = "victim not found";
+static const char cache_set_err2[] = "victim alloc failed";
+static const char cache_set_err3[] = "could not allocate new rpc buffer";
+
+static void
+cache_set(xprt, replylen)
+	SVCXPRT *xprt;
+	size_t replylen;
+{
+	cache_ptr victim;
+	cache_ptr *vicp;
+	struct svc_dg_data *su = su_data(xprt);
+	struct cl_cache *uc = (struct cl_cache *) su->su_cache;
+	u_int loc;
+	char *newbuf;
+#ifdef RPC_CACHE_DEBUG
+	struct netconfig *nconf;
+	char *uaddr;
+#endif
+
+	mutex_lock(&dupreq_lock);
+	/*
+	 * 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);
+}