439 lines
10 KiB
C
439 lines
10 KiB
C
/* $NetBSD: rpc.c,v 1.18 1998/01/23 19:27:45 thorpej Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* RPC functions used by NFS and bootparams.
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* Note that bootparams requires the ability to find out the
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* address of the server from which its response has come.
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* This is supported by keeping the IP/UDP headers in the
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* buffer space provided by the caller. (See rpc_fromaddr)
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <string.h>
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#include "rpcv2.h"
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#include "stand.h"
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#include "net.h"
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#include "netif.h"
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#include "rpc.h"
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struct auth_info {
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int32_t authtype; /* auth type */
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u_int32_t authlen; /* auth length */
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};
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struct auth_unix {
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int32_t ua_time;
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int32_t ua_hostname; /* null */
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int32_t ua_uid;
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int32_t ua_gid;
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int32_t ua_gidlist; /* null */
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};
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struct rpc_call {
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u_int32_t rp_xid; /* request transaction id */
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int32_t rp_direction; /* call direction (0) */
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u_int32_t rp_rpcvers; /* rpc version (2) */
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u_int32_t rp_prog; /* program */
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u_int32_t rp_vers; /* version */
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u_int32_t rp_proc; /* procedure */
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};
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struct rpc_reply {
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u_int32_t rp_xid; /* request transaction id */
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int32_t rp_direction; /* call direction (1) */
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int32_t rp_astatus; /* accept status (0: accepted) */
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union {
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u_int32_t rpu_errno;
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struct {
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struct auth_info rok_auth;
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u_int32_t rok_status;
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} rpu_rok;
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} rp_u;
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};
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/* Local forwards */
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static ssize_t recvrpc(struct iodesc *, void *, size_t, time_t);
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static int rpc_getport(struct iodesc *, n_long, n_long);
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int rpc_xid;
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int rpc_port = 0x400; /* predecrement */
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/*
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* Make a rpc call; return length of answer
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* Note: Caller must leave room for headers.
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*/
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ssize_t
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rpc_call(struct iodesc *d, n_long prog, n_long vers, n_long proc,
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void *sdata, size_t slen, void *rdata, size_t rlen)
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{
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ssize_t cc;
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struct auth_info *auth;
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struct rpc_call *call;
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struct rpc_reply *reply;
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char *send_head, *send_tail;
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char *recv_head, *recv_tail;
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n_long x;
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int port; /* host order */
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#ifdef RPC_DEBUG
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if (debug)
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printf("rpc_call: prog=0x%x vers=%d proc=%d\n",
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prog, vers, proc);
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#endif
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port = rpc_getport(d, prog, vers);
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if (port == -1)
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return (-1);
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d->destport = htons(port);
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/*
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* Prepend authorization stuff and headers.
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* Note, must prepend things in reverse order.
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*/
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send_head = sdata;
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send_tail = (char *)sdata + slen;
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/* Auth verifier is always auth_null */
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send_head -= sizeof(*auth);
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auth = (struct auth_info *)send_head;
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auth->authtype = htonl(RPCAUTH_NULL);
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auth->authlen = 0;
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#if 1
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/* Auth credentials: always auth unix (as root) */
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send_head -= sizeof(struct auth_unix);
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bzero(send_head, sizeof(struct auth_unix));
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send_head -= sizeof(*auth);
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auth = (struct auth_info *)send_head;
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auth->authtype = htonl(RPCAUTH_UNIX);
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auth->authlen = htonl(sizeof(struct auth_unix));
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#else
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/* Auth credentials: always auth_null (XXX OK?) */
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send_head -= sizeof(*auth);
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auth = send_head;
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auth->authtype = htonl(RPCAUTH_NULL);
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auth->authlen = 0;
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#endif
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/* RPC call structure. */
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send_head -= sizeof(*call);
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call = (struct rpc_call *)send_head;
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rpc_xid++;
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call->rp_xid = htonl(rpc_xid);
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call->rp_direction = htonl(RPC_CALL);
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call->rp_rpcvers = htonl(RPC_VER2);
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call->rp_prog = htonl(prog);
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call->rp_vers = htonl(vers);
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call->rp_proc = htonl(proc);
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/* Make room for the rpc_reply header. */
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recv_head = rdata;
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recv_tail = (char *)rdata + rlen;
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recv_head -= sizeof(*reply);
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cc = sendrecv(d,
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sendudp, send_head, send_tail - send_head,
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recvrpc, recv_head, recv_tail - recv_head);
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#ifdef RPC_DEBUG
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if (debug)
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printf("callrpc: cc=%ld rlen=%lu\n", (long)cc, (u_long)rlen);
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#endif
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if (cc == -1)
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return (-1);
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if (cc <= sizeof(*reply)) {
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errno = EBADRPC;
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return (-1);
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}
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recv_tail = recv_head + cc;
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/*
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* Check the RPC reply status.
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* The xid, dir, astatus were already checked.
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*/
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reply = (struct rpc_reply *)recv_head;
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auth = &reply->rp_u.rpu_rok.rok_auth;
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x = ntohl(auth->authlen);
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if (x != 0) {
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#ifdef RPC_DEBUG
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if (debug)
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printf("callrpc: reply auth != NULL\n");
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#endif
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errno = EBADRPC;
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return(-1);
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}
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x = ntohl(reply->rp_u.rpu_rok.rok_status);
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if (x != 0) {
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printf("callrpc: error = %ld\n", (long)x);
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errno = EBADRPC;
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return(-1);
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}
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recv_head += sizeof(*reply);
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return (ssize_t)(recv_tail - recv_head);
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}
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/*
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* Returns true if packet is the one we're waiting for.
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* This just checks the XID, direction, acceptance.
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* Remaining checks are done by callrpc
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*/
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static ssize_t
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recvrpc(struct iodesc *d, void *pkt, size_t len, time_t tleft)
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{
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struct rpc_reply *reply;
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ssize_t n;
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int x;
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errno = 0;
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#ifdef RPC_DEBUG
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if (debug)
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printf("recvrpc: called len=%lu\n", (u_long)len);
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#endif
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n = readudp(d, pkt, len, tleft);
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if (n <= (4 * 4))
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return -1;
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reply = (struct rpc_reply *)pkt;
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x = ntohl(reply->rp_xid);
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if (x != rpc_xid) {
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#ifdef RPC_DEBUG
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if (debug)
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printf("recvrpc: rp_xid %d != xid %d\n", x, rpc_xid);
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#endif
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return -1;
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}
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x = ntohl(reply->rp_direction);
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if (x != RPC_REPLY) {
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#ifdef RPC_DEBUG
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if (debug)
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printf("recvrpc: rp_direction %d != REPLY\n", x);
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#endif
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return -1;
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}
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x = ntohl(reply->rp_astatus);
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if (x != RPC_MSGACCEPTED) {
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errno = ntohl(reply->rp_u.rpu_errno);
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printf("recvrpc: reject, astat=%d, errno=%d\n", x, errno);
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return -1;
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}
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/* Return data count (thus indicating success) */
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return (n);
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}
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/*
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* Given a pointer to a reply just received,
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* dig out the IP address/port from the headers.
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*/
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void
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rpc_fromaddr(void *pkt, struct in_addr *addr, u_short *port)
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{
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struct hackhdr {
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/* Tail of IP header: just IP addresses */
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n_long ip_src;
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n_long ip_dst;
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/* UDP header: */
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u_int16_t uh_sport; /* source port */
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u_int16_t uh_dport; /* destination port */
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int16_t uh_ulen; /* udp length */
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u_int16_t uh_sum; /* udp checksum */
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/* RPC reply header: */
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struct rpc_reply rpc;
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} *hhdr;
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hhdr = ((struct hackhdr *)pkt) - 1;
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addr->s_addr = hhdr->ip_src;
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*port = hhdr->uh_sport;
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}
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/*
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* RPC Portmapper cache
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*/
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#define PMAP_NUM 8 /* need at most 5 pmap entries */
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int rpc_pmap_num;
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struct pmap_list {
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struct in_addr addr; /* server, net order */
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u_int prog; /* host order */
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u_int vers; /* host order */
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int port; /* host order */
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} rpc_pmap_list[PMAP_NUM];
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/*
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* return port number in host order, or -1.
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* arguments are:
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* addr .. server, net order.
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* prog .. host order.
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* vers .. host order.
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*/
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int
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rpc_pmap_getcache(struct in_addr addr, u_int prog, u_int vers)
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{
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struct pmap_list *pl;
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for (pl = rpc_pmap_list; pl < &rpc_pmap_list[rpc_pmap_num]; pl++) {
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if (pl->addr.s_addr == addr.s_addr &&
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pl->prog == prog && pl->vers == vers )
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{
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return (pl->port);
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}
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}
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return (-1);
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}
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/*
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* arguments are:
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* addr .. server, net order.
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* prog .. host order.
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* vers .. host order.
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* port .. host order.
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*/
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void
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rpc_pmap_putcache(struct in_addr addr, u_int prog, u_int vers, int port)
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{
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struct pmap_list *pl;
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/* Don't overflow cache... */
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if (rpc_pmap_num >= PMAP_NUM) {
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/* ... just re-use the last entry. */
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rpc_pmap_num = PMAP_NUM - 1;
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#ifdef RPC_DEBUG
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printf("rpc_pmap_putcache: cache overflow\n");
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#endif
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}
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pl = &rpc_pmap_list[rpc_pmap_num];
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rpc_pmap_num++;
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/* Cache answer */
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pl->addr = addr;
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pl->prog = prog;
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pl->vers = vers;
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pl->port = port;
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}
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/*
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* Request a port number from the port mapper.
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* Returns the port in host order.
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* prog and vers are host order.
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*/
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int
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rpc_getport(struct iodesc *d, n_long prog, n_long vers)
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{
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struct args {
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n_long prog; /* call program */
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n_long vers; /* call version */
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n_long proto; /* call protocol */
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n_long port; /* call port (unused) */
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} *args;
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struct res {
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n_long port;
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} *res;
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struct {
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n_long h[RPC_HEADER_WORDS];
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struct args d;
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} sdata;
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struct {
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n_long h[RPC_HEADER_WORDS];
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struct res d;
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n_long pad;
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} rdata;
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ssize_t cc;
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int port;
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#ifdef RPC_DEBUG
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if (debug)
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printf("%s: prog=0x%x vers=%d\n", __func__, prog, vers);
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#endif
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/* This one is fixed forever. */
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if (prog == PMAPPROG) {
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port = PMAPPORT;
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goto out;
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}
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/* Try for cached answer first */
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port = rpc_pmap_getcache(d->destip, prog, vers);
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if (port != -1)
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goto out;
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args = &sdata.d;
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args->prog = htonl(prog);
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args->vers = htonl(vers);
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args->proto = htonl(IPPROTO_UDP);
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args->port = 0;
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res = &rdata.d;
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cc = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_GETPORT,
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args, sizeof(*args), res, sizeof(*res));
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if (cc < sizeof(*res)) {
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printf("getport: %s", strerror(errno));
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errno = EBADRPC;
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return (-1);
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}
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port = (int)ntohl(res->port);
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rpc_pmap_putcache(d->destip, prog, vers, port);
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out:
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#ifdef RPC_DEBUG
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if (debug)
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printf("%s: port=%u\n", __func__, port);
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#endif
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return (port);
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}
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