int
decode_tcp_nfs_half(struct tuple4 *addr, struct half_stream *hs)
{
u_char *p, *buf;
int i, len, discard;
u_int32_t fraghdr;
buf = hs->data;
len = hs->count - hs->offset;
discard = 0;
for (p = buf; p + 4 < buf + len; ) {
fraghdr = pntohl(p);
p += 4 + FRAGLEN(fraghdr);
if (p > buf + len)
return (0);
if (LASTFRAG(fraghdr)) {
i = p - buf;
decode_nfs(addr, buf, i);
buf += i;
len -= i;
discard += i;
}
}
return (discard);
}
int
rpc_decode(u_char *buf, int len, struct rpc_msg *msg)
{
XDR xdrs;
u_int32_t fraghdr;
u_char *p, *tmp;
int stat, tmplen;
if (len < 20)
return (0);
p = buf + 4;
/* If not recognizably RPC, try TCP record defragmentation */
if (pntohl(p) != CALL && pntohl(p) != REPLY) {
tmp = buf;
tmplen = 0;
for (;;) {
fraghdr = pntohl(tmp);
if (FRAGLEN(fraghdr) + 4 > len)
return (0);
len -= 4;
memmove(tmp, tmp + 4, len);
tmplen += FRAGLEN(fraghdr);
if (LASTFRAG(fraghdr))
break;
tmp += FRAGLEN(fraghdr);
len -= FRAGLEN(fraghdr);
if (len < 4)
return (0);
}
len = tmplen;
}
/* Decode RPC message. */
memset(msg, 0, sizeof(*msg));
if (ntohl(((struct rpc_msg *)buf)->rm_direction) == CALL) {
xdrmem_create(&xdrs, buf, len, XDR_DECODE);
if (!xdr_callmsg(&xdrs, msg)) {
xdr_destroy(&xdrs);
return (0);
}
}
else if (ntohl(((struct rpc_msg *)buf)->rm_direction) == REPLY) {
msg->acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
xdrmem_create(&xdrs, buf, len, XDR_DECODE);
if (!xdr_replymsg(&xdrs, msg)) {
xdr_destroy(&xdrs);
return (0);
}
}
stat = xdr_getpos(&xdrs);
xdr_destroy(&xdrs);
return (stat);
}
