+++ /dev/null
-/*
- * 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
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: svc_udp.c,v 1.8 1998/03/19 00:27:26 millert Exp $";
-#endif /* LIBC_SCCS and not lint */
-
-/*
- * svc_udp.c,
- * Server side for UDP/IP based RPC. (Does some caching in the hopes of
- * achieving execute-at-most-once semantics.)
- *
- * Copyright (C) 1984, Sun Microsystems, Inc.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <rpc/rpc.h>
-#include <sys/socket.h>
-#include <errno.h>
-#include <unistd.h>
-
-
-#define rpc_buffer(xprt) ((xprt)->xp_p1)
-#ifndef MAX
-#define MAX(a, b) ((a > b) ? a : b)
-#endif
-
-static bool_t svcudp_recv();
-static bool_t svcudp_reply();
-static enum xprt_stat svcudp_stat();
-static bool_t svcudp_getargs();
-static bool_t svcudp_freeargs();
-static void svcudp_destroy();
-static void cache_set __P((SVCXPRT *, u_long));
-static int cache_get __P((SVCXPRT *, struct rpc_msg *, char **, u_long *));
-
-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 */
-};
-#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;
- }
- memset(&addr, 0, sizeof (addr));
-#ifndef __linux__
- addr.sin_len = sizeof(struct sockaddr_in);
-#endif
- addr.sin_family = AF_INET;
- if (bindresvport(sock, &addr)) {
- addr.sin_port = 0;
- (void)bind(sock, (struct sockaddr *)&addr, len);
- }
- 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) {
- (void)fprintf(stderr, "svcudp_create: out of memory\n");
- if (madesock)
- (void)close(sock);
- return (NULL);
- }
- su = (struct svcudp_data *)mem_alloc(sizeof(*su));
- if (su == NULL) {
- (void)fprintf(stderr, "svcudp_create: out of memory\n");
- if (madesock)
- (void)close(sock);
- free(xprt);
- return (NULL);
- }
- su->su_iosz = ((MAX(sendsz, recvsz) + 3) / 4) * 4;
- if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL) {
- (void)fprintf(stderr, "svcudp_create: out of memory\n");
- if (madesock)
- (void)close(sock);
- free(xprt);
- free(su);
- return (NULL);
- }
- xdrmem_create(
- &(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_DECODE);
- su->su_cache = NULL;
- xprt->xp_p2 = (caddr_t)su;
- xprt->xp_auth = NULL;
- 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);
-}
-
-SVCXPRT *
-svcudp_create(sock)
- int sock;
-{
-
- return(svcudp_bufcreate(sock, UDPMSGSIZE, UDPMSGSIZE));
-}
-
-/* ARGSUSED */
-static enum xprt_stat
-svcudp_stat(xprt)
- SVCXPRT *xprt;
-{
-
- return (XPRT_IDLE);
-}
-
-static bool_t
-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;
- u_long replylen;
-
- 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 && errno == EINTR)
- goto again;
- if (rlen == -1 || rlen < 4*sizeof(u_int32_t))
- 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) {
- if (cache_get(xprt, msg, &reply, &replylen)) {
- (void) sendto(xprt->xp_sock, reply, (int) replylen, 0,
- (struct sockaddr *) &xprt->xp_raddr, xprt->xp_addrlen);
- return (TRUE);
- }
- }
- return (TRUE);
-}
-
-static bool_t
-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;
- xdrproc_t xdr_proc;
- caddr_t xdr_where;
-
- xdrs->x_op = XDR_ENCODE;
- XDR_SETPOS(xdrs, 0);
- msg->rm_xid = su->su_xid;
-
- if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
- msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
- xdr_proc = msg->acpted_rply.ar_results.proc;
- xdr_where = msg->acpted_rply.ar_results.where;
- msg->acpted_rply.ar_results.proc = xdr_void;
- msg->acpted_rply.ar_results.where = NULL;
-
- if (!xdr_replymsg(xdrs, msg) ||
- !SVCAUTH_WRAP(xprt->xp_auth, xdrs, xdr_proc, xdr_where))
- return (FALSE);
- }
- else if (!xdr_replymsg(xdrs, msg)) {
- return (FALSE);
- }
- slen = (int)XDR_GETPOS(xdrs);
-
- if (sendto(xprt->xp_sock, rpc_buffer(xprt), slen, 0,
- (struct sockaddr *)&(xprt->xp_raddr), xprt->xp_addrlen)
- != slen) {
- return (FALSE);
- }
- if (su->su_cache && slen >= 0)
- cache_set(xprt, (u_long) slen);
-
- return (TRUE);
-}
-
-static bool_t
-svcudp_getargs(xprt, xdr_args, args_ptr)
- SVCXPRT *xprt;
- xdrproc_t xdr_args;
- caddr_t args_ptr;
-{
- return (SVCAUTH_UNWRAP(xprt->xp_auth, &(su_data(xprt)->su_xdrs),
- xdr_args, args_ptr));
-}
-
-static bool_t
-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));
-}
-
-static void
-svcudp_destroy(xprt)
- register SVCXPRT *xprt;
-{
- register struct svcudp_data *su = su_data(xprt);
-
- xprt_unregister(xprt);
- if (xprt->xp_sock != -1)
- (void)close(xprt->xp_sock);
- xprt->xp_sock = -1;
- if (xprt->xp_auth != NULL) {
- SVCAUTH_DESTROY(xprt->xp_auth);
- xprt->xp_auth = NULL;
- }
- 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));
-}
-
-
-/***********this could be a separate file*********************/
-
-/*
- * 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) fprintf(stderr,"%s\n", msg)
-
-#define ALLOC(type, size) \
- (type *) mem_alloc((unsigned) (sizeof(type) * (size)))
-
-#define BZERO(addr, type, size) \
- memset((char *) addr, 0, 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.
- */
-int
-svcudp_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 void
-cache_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 = 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 int
-cache_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) (memcmp(&a1, &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);
-}
-
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