/* svc_udp.c - server side for UDP/IP based RPC *//* Copyright 1984-2001 Wind River Systems, Inc. */#include "copyright_wrs.h"/* * Copyright (C) 1984, Sun Microsystems, Inc. * * 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 *//*modification history--------------------01p,05nov01,vvv  fixed compilation warnings01o,18apr00,ham  fixed compilation warnings.01n,15sep93,kdl  changed svcudp_create() to only take one parameter (SPR #2427).01m,11aug93,jmm  Changed ioctl.h and socket.h to sys/ioctl.h and sys/socket.h01l,04jun92,wmd  added forward declarations required for gcc960 v2.0.01k,26may92,rrr  the tree shuffle		  -changed includes to have absolute path from h/01j,04oct91,rrr  passed through the ansification filter		  -changed includes to have absolute path from h/		  -changed VOID to void		  -changed copyright notice01i,07oct90,hjb   deleted declaration of mem_alloc() due to problems with		  ISI cpp complaining about macro argument.  Added include		  of "memLib.h" instead.01h,19jul90,dnw  changed declaration of mem_alloc() from char* to void*		 added coercions to (char*) where necessary01g,10may90,dnw  changed to use rpcErrnoGet instead of errnoGet01f,19apr90,hjb  de-linted.01e,27oct89,hjb  upgraded to 4.001d,30may88,dnw  changed to v4 names.01c,05apr88,gae  changed fprintf() to printErr().01b,11nov87,jlf  added wrs copyright, title, mod history, etc.01a,01nov87,rdc  first VxWorks version*/#ifndef lint/* static char sccsid[] = "@(#)svc_udp.c 1.1 86/02/03 Copyr 1984 Sun Micro"; */#endif/* * svc_udp.c, * Server side for UDP/IP based RPC.  (Does some caching in the hopes of * achieving execute-at-most-once semantics.) * */#include "rpc/rpctypes.h"#include "netinet/in.h"#include "sys/socket.h"#include "errno.h"#include "rpc/xdr.h"#include "rpc/auth.h"#include "rpc/clnt.h"#include "rpc/rpc_msg.h"#include "rpc/svc.h"#include "vxWorks.h"#include "memLib.h"#include "sockLib.h"#include "remLib.h"#include "ioLib.h"#include "stdio.h"#include "stdlib.h"#include "rpcLib.h"#ifdef BUFSIZ#undef BUFSIZ#endif#define BUFSIZ 1024#define rpc_buffer(xprt) ((xprt)->xp_p1)#define MAX(a, b)     ((a > b) ? a : b)LOCAL bool_t		svcudp_recv();LOCAL bool_t		svcudp_reply();LOCAL enum xprt_stat	svcudp_stat();LOCAL bool_t		svcudp_getargs();LOCAL bool_t		svcudp_freeargs();LOCAL void		svcudp_destroy();LOCAL int		cache_get();LOCAL void		cache_set();static struct xp_ops svcudp_op = {	svcudp_recv,	svcudp_stat,	svcudp_getargs,	svcudp_reply,	svcudp_freeargs,	svcudp_destroy};/* * kept in xprt->xp_p2 */struct svcudp_data {	u_int   su_iosz;	/* byte size of send.recv buffer */	u_long	su_xid;		/* transaction id */	XDR	su_xdrs;	/* XDR handle */	char	su_verfbody[MAX_AUTH_BYTES];	/* verifier body */	char   *su_cache;	/* cached data, NULL if no cache - 4.0 */};#define	su_data(xprt)	((struct svcudp_data *)(xprt->xp_p2))/* * Usage: *	xprt = svcudp_create(sock); * * If sock<0 then a socket is created, else sock is used. * If the socket, sock is not bound to a port then svcudp_create * binds it to an arbitrary port.  In any (successful) case, * xprt->xp_sock is the registered socket number and xprt->xp_port is the * associated port number. * Once *xprt is initialized, it is registered as a transporter; * see (svc.h, xprt_register). * The routines returns NULL if a problem occurred. */SVCXPRT *svcudp_bufcreate(sock, sendsz, recvsz)	register int sock;	u_int sendsz, recvsz;{	bool_t madesock = FALSE;	register SVCXPRT *xprt;	register struct svcudp_data *su;	struct sockaddr_in addr;	int len = sizeof(struct sockaddr_in);	if (sock == RPC_ANYSOCK) {		if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {			perror("svcudp_create: socket creation problem");			return ((SVCXPRT *)NULL);		}		madesock = TRUE;	}	bzero ((char *) &addr, sizeof (addr));			/* 4.0 */	addr.sin_family = AF_INET;	if (bindresvport (sock, &addr))				/* 4.0 */	    {							/* 4.0 */	    addr.sin_port = 0;					/* 4.0 */	    (void)bind(sock, (struct sockaddr *)&addr, len);	/* 4.0 */	    }							/* 4.0 */	if (getsockname(sock, (struct sockaddr *)&addr, &len) != 0) {		perror("svcudp_create - cannot getsockname");		if (madesock)			(void)close(sock);		return ((SVCXPRT *)NULL);	}	xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));	if (xprt == NULL) {		printErr ("svcudp_create: out of memory\n");		return (NULL);	}	su = (struct svcudp_data *)mem_alloc(sizeof(*su));	if (su == NULL) {		printErr ("svcudp_create: out of memory\n");		return (NULL);	}	su->su_iosz = ((MAX(sendsz, recvsz) + 3) / 4) * 4;	if ((rpc_buffer(xprt) = (char *) mem_alloc(su->su_iosz)) == NULL) {		printErr ("svcudp_create: out of memory\n");		return (NULL);	}	xdrmem_create(	    &(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_DECODE);	su->su_cache = NULL;			/* 4.0 */	xprt->xp_p2 = (caddr_t)su;	xprt->xp_verf.oa_base = su->su_verfbody;	xprt->xp_ops = &svcudp_op;	xprt->xp_port = ntohs(addr.sin_port);	xprt->xp_sock = sock;	xprt_register(xprt);	return (xprt);}/* ARGSUSED1 */SVCXPRT *svcudp_create(sock)	int sock;{	return(svcudp_bufcreate(sock, UDPMSGSIZE, UDPMSGSIZE));}/* ARGSUSED0 */LOCAL enum xprt_stat				/* 4.0 */svcudp_stat(xprt)	SVCXPRT *xprt;{	return (XPRT_IDLE);}LOCAL bool_t					/* 4.0 */svcudp_recv(xprt, msg)	register SVCXPRT *xprt;	struct rpc_msg *msg;{	register struct svcudp_data *su = su_data(xprt);	register XDR *xdrs = &(su->su_xdrs);	register int rlen;	char *reply;					/* 4.0 */	u_long replylen;				/* 4.0 */    again:	xprt->xp_addrlen = sizeof(struct sockaddr_in);	rlen = recvfrom(xprt->xp_sock, rpc_buffer(xprt), (int) su->su_iosz,	    0, (struct sockaddr *)&(xprt->xp_raddr), &(xprt->xp_addrlen));	if (rlen == -1 && (rpcErrnoGet () == EINTR))		goto again;	if (rlen < 4*sizeof(u_long))		return (FALSE);	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)				/* 4.0 */	    {							/* 4.0 */	    if (cache_get (xprt, msg, &reply, &replylen))	/* 4.0 */		{						/* 4.0 *//* 4.0 */	(void) sendto (xprt->xp_sock, reply, (int) replylen, 0,			       (struct sockaddr *) &xprt->xp_raddr, /* 4.0 */			       xprt->xp_addrlen);		/* 4.0 */		}						/* 4.0 */	    }							/* 4.0 */	return (TRUE);}LOCAL bool_t							/* 4.0 */svcudp_reply(xprt, msg)	register SVCXPRT *xprt;	struct rpc_msg *msg;{	register struct svcudp_data *su = su_data(xprt);	register XDR *xdrs = &(su->su_xdrs);	register int slen;	register bool_t stat = FALSE;	xdrs->x_op = XDR_ENCODE;	XDR_SETPOS(xdrs, 0);	msg->rm_xid = su->su_xid;	if (xdr_replymsg(xdrs, msg)) {		slen = (int)XDR_GETPOS(xdrs);		if (sendto(xprt->xp_sock, rpc_buffer(xprt), slen, 0,		    (struct sockaddr *)&(xprt->xp_raddr), xprt->xp_addrlen)		    == slen)		    {						/* 4.0 */		    stat = TRUE;		    if (su->su_cache && slen >= 0)		/* 4.0 */			{					/* 4.0 */			cache_set (xprt, (u_long) slen);	/* 4.0 */			}					/* 4.0 */		    }						/* 4.0 */	}	return (stat);}LOCAL bool_t						/* 4.0 */svcudp_getargs(xprt, xdr_args, args_ptr)	SVCXPRT *xprt;	xdrproc_t xdr_args;	caddr_t args_ptr;{	return ((*xdr_args)(&(su_data(xprt)->su_xdrs), args_ptr));}LOCAL bool_t						/* 4.0 */svcudp_freeargs(xprt, xdr_args, args_ptr)	SVCXPRT *xprt;	xdrproc_t xdr_args;	caddr_t args_ptr;{	register XDR *xdrs = &(su_data(xprt)->su_xdrs);	xdrs->x_op = XDR_FREE;	return ((*xdr_args)(xdrs, args_ptr));}LOCAL void						/* 4.0 */svcudp_destroy(xprt)	register SVCXPRT *xprt;{	register struct svcudp_data *su = su_data(xprt);	xprt_unregister(xprt);	(void)close(xprt->xp_sock);	XDR_DESTROY(&(su->su_xdrs));	mem_free(rpc_buffer(xprt), su->su_iosz);	mem_free((caddr_t)su, sizeof(struct svcudp_data));	mem_free((caddr_t)xprt, sizeof(SVCXPRT));}/******************* 4.0 additions ***************************//* * Fifo cache for udp server: * Copies pointers to reply buffers into fifo cache. * Buffers are sent again if retransmissions are detected. */#define SPARSENESS	4		/* 75 % sparse */#define CACHE_PERROR(msg) 	(void) printErr ("%s\n", (msg))#define ALLOC(type, size)	\	(type *) mem_alloc ((unsigned) (sizeof (type) * (size)))#define BZERO(addr, type, size)	 \	bzero((char *) addr, sizeof(type) * (int) (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_long cache_xid;	u_long cache_proc;	u_long cache_vers;	u_long cache_prog;	struct sockaddr_in cache_addr;	/*	 * The cached reply and length	 */	char * cache_reply;	u_long cache_replylen;	/* 	 * Next node on the list, if there is a collision	 */	cache_ptr cache_next;};/* * The entire cache */struct udp_cache {	u_long 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_long uc_nextvictim;	/* points to next victim in fifo list */	u_long uc_prog;		/* saved program number */	u_long uc_vers;		/* saved version number */	u_long uc_proc;		/* saved procedure number */	struct sockaddr_in uc_addr; /* saved caller's address */};/* * the hashing function */#define CACHE_LOC(transp, xid)	\ (xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size))/* * Enable use of the cache. * Note: there is no disable. */intsvcudp_enablecache(transp, size)	SVCXPRT *transp;	u_long size;{	struct svcudp_data *su = su_data(transp);	struct udp_cache *uc;	if (su->su_cache != NULL) {		CACHE_PERROR("enablecache: cache already enabled");		return(0);	}	uc = ALLOC(struct udp_cache, 1);	if (uc == NULL) {		CACHE_PERROR("enablecache: could not allocate cache");		return(0);	}	uc->uc_size = size;	uc->uc_nextvictim = 0;	uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS);	if (uc->uc_entries == NULL) {		CACHE_PERROR("enablecache: could not allocate cache data");		return(0);	}	BZERO(uc->uc_entries, cache_ptr, size * SPARSENESS);	uc->uc_fifo = ALLOC(cache_ptr, size);	if (uc->uc_fifo == NULL) {		CACHE_PERROR("enablecache: could not allocate cache fifo");		return(0);	}	BZERO(uc->uc_fifo, cache_ptr, size);	su->su_cache = (char *) uc;	return(1);}/* * Set an entry in the cache */static voidcache_set(xprt, replylen)	SVCXPRT *xprt;	u_long replylen;{	register cache_ptr victim;	register cache_ptr *vicp;	register struct svcudp_data *su = su_data(xprt);	struct udp_cache *uc = (struct udp_cache *) su->su_cache;	u_int loc;	char *newbuf;	/* 	 * 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) {			CACHE_PERROR("cache_set: victim not found");			return;		}		*vicp = victim->cache_next;	/* remote from cache */		newbuf = victim->cache_reply;	} else {		victim = ALLOC(struct cache_node, 1);		if (victim == NULL) {			CACHE_PERROR("cache_set: victim alloc failed");			return;		}		newbuf = (char *) mem_alloc(su->su_iosz);		if (newbuf == NULL) {			CACHE_PERROR("cache_set: could not allocate new rpc_buffer");			return;		}	}	/*	 * Store it away	 */	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 = uc->uc_addr;	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;}/* * Try to get an entry from the cache * return 1 if found, 0 if not found */static intcache_get(xprt, msg, replyp, replylenp)	SVCXPRT *xprt;	struct rpc_msg *msg;	char **replyp;	u_long *replylenp;{	u_int loc;	register cache_ptr ent;	register struct svcudp_data *su = su_data(xprt);	register struct udp_cache *uc = (struct udp_cache *) su->su_cache;#	define EQADDR(a1, a2)	(bcmp((char*)&a1, (char*)&a2, sizeof(a1)) == 0)	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 == uc->uc_proc &&		  ent->cache_vers == uc->uc_vers &&		  ent->cache_prog == uc->uc_prog &&		  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);}/************************ 4.0 additions **********************************/