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-rw-r--r--src/lib/rpc/svc_udp.c544
1 files changed, 544 insertions, 0 deletions
diff --git a/src/lib/rpc/svc_udp.c b/src/lib/rpc/svc_udp.c
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+++ b/src/lib/rpc/svc_udp.c
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+/* @(#)svc_udp.c 2.2 88/07/29 4.0 RPCSRC */
+/*
+ * Copyright (c) 2010, Oracle America, Inc.
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * * Neither the name of the "Oracle America, Inc." nor the names of
+ * its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#if !defined(lint) && defined(SCCSIDS)
+static char sccsid[] = "@(#)svc_udp.c 1.24 87/08/11 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 "k5-platform.h"
+#include <unistd.h>
+#include <gssrpc/rpc.h>
+#include <sys/socket.h>
+#ifdef HAVE_SYS_UIO_H
+#include <sys/uio.h>
+#endif
+#include <port-sockets.h>
+#include <socket-utils.h>
+
+
+#ifndef GETSOCKNAME_ARG3_TYPE
+#define GETSOCKNAME_ARG3_TYPE int
+#endif
+
+#define rpc_buffer(xprt) ((xprt)->xp_p1)
+#ifndef MAX
+#define MAX(a, b) ((a > b) ? a : b)
+#endif
+
+static bool_t svcudp_recv(SVCXPRT *, struct rpc_msg *);
+static bool_t svcudp_reply(SVCXPRT *, struct rpc_msg *);
+static enum xprt_stat svcudp_stat(SVCXPRT *);
+static bool_t svcudp_getargs(SVCXPRT *, xdrproc_t, void *);
+static bool_t svcudp_freeargs(SVCXPRT *, xdrproc_t, void *);
+static void svcudp_destroy(SVCXPRT *);
+
+static void cache_set(SVCXPRT *, uint32_t);
+static int cache_get(SVCXPRT *, struct rpc_msg *, char **, uint32_t *);
+
+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 */
+ uint32_t su_xid; /* transaction id */
+ XDR su_xdrs; /* XDR handle */
+ char su_verfbody[MAX_AUTH_BYTES]; /* verifier body */
+ void * 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(
+ register int sock,
+ u_int sendsz,
+ u_int recvsz)
+{
+ bool_t madesock = FALSE;
+ register SVCXPRT *xprt;
+ register struct svcudp_data *su;
+ struct sockaddr_storage ss;
+ struct sockaddr *sa = (struct sockaddr *)&ss;
+ socklen_t len;
+
+ if (sock == RPC_ANYSOCK) {
+ if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+ perror("svcudp_create: socket creation problem");
+ return ((SVCXPRT *)NULL);
+ }
+ set_cloexec_fd(sock);
+ madesock = TRUE;
+ memset(&ss, 0, sizeof(ss));
+ sa->sa_family = AF_INET;
+ } else {
+ len = sizeof(struct sockaddr_storage);
+ if (getsockname(sock, sa, &len) < 0) {
+ perror("svcudp_create - cannot getsockname");
+ return ((SVCXPRT *)NULL);
+ }
+ }
+
+ if (bindresvport_sa(sock, sa)) {
+ sa_setport(sa, 0);
+ (void)bind(sock, sa, sa_socklen(sa));
+ }
+ len = sizeof(struct sockaddr_storage);
+ if (getsockname(sock, sa, &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");
+ return (NULL);
+ }
+ su = (struct svcudp_data *)mem_alloc(sizeof(*su));
+ if (su == NULL) {
+ (void)fprintf(stderr, "svcudp_create: out of memory\n");
+ 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");
+ 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 = sa_getport(sa);
+ xprt->xp_sock = sock;
+ xprt_register(xprt);
+ return (xprt);
+}
+
+SVCXPRT *
+svcudp_create(int sock)
+{
+
+ return(svcudp_bufcreate(sock, UDPMSGSIZE, UDPMSGSIZE));
+}
+
+static enum xprt_stat
+svcudp_stat(SVCXPRT *xprt)
+{
+
+ return (XPRT_IDLE);
+}
+
+static bool_t
+svcudp_recv(
+ register SVCXPRT *xprt,
+ struct rpc_msg *msg)
+{
+ struct msghdr dummy;
+ struct iovec dummy_iov[1];
+ register struct svcudp_data *su = su_data(xprt);
+ register XDR *xdrs = &(su->su_xdrs);
+ register int rlen;
+ char *reply;
+ uint32_t replylen;
+ socklen_t addrlen;
+
+ again:
+ memset(&dummy, 0, sizeof(dummy));
+ dummy_iov[0].iov_base = rpc_buffer(xprt);
+ dummy_iov[0].iov_len = (int) su->su_iosz;
+ dummy.msg_iov = dummy_iov;
+ dummy.msg_iovlen = 1;
+ dummy.msg_namelen = xprt->xp_laddrlen = sizeof(struct sockaddr_in);
+ dummy.msg_name = (char *) &xprt->xp_laddr;
+ rlen = recvmsg(xprt->xp_sock, &dummy, MSG_PEEK);
+ if (rlen == -1) {
+ if (errno == EINTR)
+ goto again;
+ else
+ return (FALSE);
+ }
+
+ addrlen = sizeof(struct sockaddr_in);
+ rlen = recvfrom(xprt->xp_sock, rpc_buffer(xprt), (int) su->su_iosz,
+ 0, (struct sockaddr *)&(xprt->xp_raddr), &addrlen);
+ if (rlen == -1 && errno == EINTR)
+ goto again;
+ if (rlen < (int) (4*sizeof(uint32_t)))
+ return (FALSE);
+ xprt->xp_addrlen = addrlen;
+ 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(
+ 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;
+
+ xdrproc_t xdr_results = NULL;
+ caddr_t xdr_location = 0;
+ bool_t has_args;
+
+ if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
+ msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
+ has_args = TRUE;
+ xdr_results = msg->acpted_rply.ar_results.proc;
+ xdr_location = msg->acpted_rply.ar_results.where;
+
+ msg->acpted_rply.ar_results.proc = xdr_void;
+ msg->acpted_rply.ar_results.where = NULL;
+ } else
+ has_args = FALSE;
+
+ xdrs->x_op = XDR_ENCODE;
+ XDR_SETPOS(xdrs, 0);
+ msg->rm_xid = su->su_xid;
+ if (xdr_replymsg(xdrs, msg) &&
+ (!has_args ||
+ (SVCAUTH_WRAP(xprt->xp_auth, xdrs, xdr_results, xdr_location)))) {
+ slen = (int)XDR_GETPOS(xdrs);
+ if (sendto(xprt->xp_sock, rpc_buffer(xprt), slen, 0,
+ (struct sockaddr *)&(xprt->xp_raddr), xprt->xp_addrlen)
+ == slen) {
+ stat = TRUE;
+ if (su->su_cache && slen >= 0) {
+ cache_set(xprt, (uint32_t) slen);
+ }
+ }
+ }
+ return (stat);
+}
+
+static bool_t
+svcudp_getargs(
+ SVCXPRT *xprt,
+ xdrproc_t xdr_args,
+ void * args_ptr)
+{
+ if (! SVCAUTH_UNWRAP(xprt->xp_auth, &(su_data(xprt)->su_xdrs),
+ xdr_args, args_ptr)) {
+ (void)svcudp_freeargs(xprt, xdr_args, args_ptr);
+ return FALSE;
+ }
+ return TRUE;
+}
+
+static bool_t
+svcudp_freeargs(
+ SVCXPRT *xprt,
+ xdrproc_t xdr_args,
+ void * 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(register SVCXPRT *xprt)
+{
+ register struct svcudp_data *su = su_data(xprt);
+
+ xprt_unregister(xprt);
+ if (xprt->xp_sock != INVALID_SOCKET)
+ (void)closesocket(xprt->xp_sock);
+ xprt->xp_sock = INVALID_SOCKET;
+ 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(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
+ */
+ uint32_t cache_xid;
+ rpcproc_t cache_proc;
+ rpcvers_t cache_vers;
+ rpcprog_t cache_prog;
+ struct sockaddr_in cache_addr;
+ /*
+ * The cached reply and length
+ */
+ char * cache_reply;
+ uint32_t cache_replylen;
+ /*
+ * Next node on the list, if there is a collision
+ */
+ cache_ptr cache_next;
+};
+
+
+
+/*
+ * The entire cache
+ */
+struct udp_cache {
+ uint32_t 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 */
+ uint32_t 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 */
+ 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(
+ SVCXPRT *transp,
+ uint32_t 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(
+ SVCXPRT *xprt,
+ uint32_t 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(
+ SVCXPRT *xprt,
+ struct rpc_msg *msg,
+ char **replyp,
+ uint32_t *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((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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-03 15:06:19 +0000