#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)svc_udp.c 1.24 87/08/11 Copyr 1984 Sun Micro";
#endif
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <gssrpc/rpc.h>
#include <sys/socket.h>
#include <errno.h>
#include "autoconf.h"
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#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
};
struct svcudp_data {
u_int su_iosz;
uint32_t su_xid;
XDR su_xdrs;
char su_verfbody[MAX_AUTH_BYTES];
void * su_cache;
};
#define su_data(xprt) ((struct svcudp_data *)(xprt->xp_p2))
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_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((char *)&addr, 0, sizeof (addr));
#if HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
addr.sin_len = sizeof(addr);
#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");
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 = ntohs(addr.sin_port);
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;
again:
memset((char *) &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);
}
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 < (int) 4*sizeof(uint32_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(
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;
caddr_t xdr_location;
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 != -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));
}
#define SPARSENESS 4
#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))
typedef struct cache_node *cache_ptr;
struct cache_node {
uint32_t cache_xid;
rpcproc_t cache_proc;
rpcvers_t cache_vers;
rpcprog_t cache_prog;
struct sockaddr_in cache_addr;
char * cache_reply;
uint32_t cache_replylen;
cache_ptr cache_next;
};
struct udp_cache {
uint32_t uc_size;
cache_ptr *uc_entries;
cache_ptr *uc_fifo;
uint32_t uc_nextvictim;
rpcprog_t uc_prog;
rpcvers_t uc_vers;
rpcproc_t uc_proc;
struct sockaddr_in uc_addr;
};
#define CACHE_LOC(transp, xid) \
(xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size))
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);
}
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;
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;
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;
}
}
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;
}
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);
}
}
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);
}