X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=support%2Frpc%2Fsvc_udp.c;fp=support%2Frpc%2Fsvc_udp.c;h=0000000000000000000000000000000000000000;hp=70a52173443f42bf671338412db3051dcd2703f5;hb=a1b7c0da9e73a607f4bc70ffe3b44b00f5d39938;hpb=1d0397894463e507e9f5d92442ac3b09e29310a3 diff --git a/support/rpc/svc_udp.c b/support/rpc/svc_udp.c deleted file mode 100644 index 70a5217..0000000 --- a/support/rpc/svc_udp.c +++ /dev/null @@ -1,516 +0,0 @@ -/* - * 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 -#include -#include -#include -#include -#include -#include - - -#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); -} -