482 lines
12 KiB
C
482 lines
12 KiB
C
/* $NetBSD: krpc_subr.c,v 1.12.4.1 1996/06/07 00:52:26 cgd Exp $ */
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/* $FreeBSD$ */
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/*
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* Copyright (c) 1995 Gordon Ross, Adam Glass
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory and its contributors.
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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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* partially based on:
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* libnetboot/rpc.c
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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/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/uio.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <nfs/rpcv2.h>
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#include <nfs/krpc.h>
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#include <nfs/xdr_subs.h>
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/*
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* Kernel support for Sun RPC
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*
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* Used currently for bootstrapping in nfs diskless configurations.
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*/
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/*
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* Generic RPC headers
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*/
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struct auth_info {
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u_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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struct auth_info rpc_auth;
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struct auth_unix rpc_unix;
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struct auth_info rpc_verf;
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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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#define rp_errno rp_u.rpu_errno
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#define rp_auth rp_u.rpu_rok.rok_auth
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#define rp_status rp_u.rpu_rok.rok_status
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#define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
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/*
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* What is the longest we will wait before re-sending a request?
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* Note this is also the frequency of "RPC timeout" messages.
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* The re-send loop count sup linearly to this maximum, so the
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* first complaint will happen after (1+2+3+4+5)=15 seconds.
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*/
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#define MAX_RESEND_DELAY 5 /* seconds */
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/*
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* Call portmap to lookup a port number for a particular rpc program
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* Returns non-zero error on failure.
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*/
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int
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krpc_portmap(sin, prog, vers, portp, procp)
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struct sockaddr_in *sin; /* server address */
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u_int prog, vers; /* host order */
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u_int16_t *portp; /* network order */
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struct proc *procp;
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{
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struct sdata {
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u_int32_t prog; /* call program */
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u_int32_t vers; /* call version */
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u_int32_t proto; /* call protocol */
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u_int32_t port; /* call port (unused) */
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} *sdata;
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struct rdata {
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u_int16_t pad;
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u_int16_t port;
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} *rdata;
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struct mbuf *m;
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int error;
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/* The portmapper port is fixed. */
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if (prog == PMAPPROG) {
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*portp = htons(PMAPPORT);
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return 0;
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}
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m = m_get(M_WAIT, MT_DATA);
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if (m == NULL)
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return ENOBUFS;
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sdata = mtod(m, struct sdata *);
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m->m_len = sizeof(*sdata);
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/* Do the RPC to get it. */
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sdata->prog = txdr_unsigned(prog);
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sdata->vers = txdr_unsigned(vers);
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sdata->proto = txdr_unsigned(IPPROTO_UDP);
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sdata->port = 0;
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sin->sin_port = htons(PMAPPORT);
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error = krpc_call(sin, PMAPPROG, PMAPVERS,
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PMAPPROC_GETPORT, &m, NULL, procp);
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if (error)
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return error;
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if (m->m_len < sizeof(*rdata)) {
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m = m_pullup(m, sizeof(*rdata));
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if (m == NULL)
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return ENOBUFS;
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}
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rdata = mtod(m, struct rdata *);
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*portp = rdata->port;
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m_freem(m);
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return 0;
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}
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/*
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* Do a remote procedure call (RPC) and wait for its reply.
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* If from_p is non-null, then we are doing broadcast, and
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* the address from whence the response came is saved there.
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*/
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int
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krpc_call(sa, prog, vers, func, data, from_p, procp)
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struct sockaddr_in *sa;
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u_int prog, vers, func;
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struct mbuf **data; /* input/output */
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struct sockaddr **from_p; /* output */
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struct proc *procp;
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{
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struct socket *so;
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struct sockaddr_in *sin, ssin;
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struct sockaddr *from;
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struct mbuf *m, *nam, *mhead;
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struct rpc_call *call;
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struct rpc_reply *reply;
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struct sockopt sopt;
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struct timeval tv;
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struct uio auio;
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int error, rcvflg, timo, secs, len;
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static u_int32_t xid = ~0xFF;
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u_int16_t tport;
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/*
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* Validate address family.
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* Sorry, this is INET specific...
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*/
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if (sa->sin_family != AF_INET)
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return (EAFNOSUPPORT);
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/* Free at end if not null. */
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nam = mhead = NULL;
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from = NULL;
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/*
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* Create socket and set its recieve timeout.
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*/
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if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0, procp)))
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goto out;
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tv.tv_sec = 1;
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tv.tv_usec = 0;
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bzero(&sopt, sizeof sopt);
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sopt.sopt_level = SOL_SOCKET;
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sopt.sopt_name = SO_RCVTIMEO;
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sopt.sopt_val = &tv;
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sopt.sopt_valsize = sizeof tv;
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if ((error = sosetopt(so, &sopt)) != 0)
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goto out;
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/*
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* Enable broadcast if necessary.
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*/
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if (from_p) {
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int on = 1;
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sopt.sopt_name = SO_BROADCAST;
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sopt.sopt_val = &on;
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sopt.sopt_valsize = sizeof on;
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if ((error = sosetopt(so, &sopt)) != 0)
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goto out;
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}
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/*
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* Bind the local endpoint to a reserved port,
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* because some NFS servers refuse requests from
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* non-reserved (non-privileged) ports.
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*/
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sin = &ssin;
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bzero(sin, sizeof *sin);
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sin->sin_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = INADDR_ANY;
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tport = IPPORT_RESERVED;
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do {
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tport--;
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sin->sin_port = htons(tport);
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error = sobind(so, (struct sockaddr *)sin, procp);
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} while (error == EADDRINUSE &&
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tport > IPPORT_RESERVED / 2);
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if (error) {
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printf("bind failed\n");
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goto out;
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}
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/*
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* Setup socket address for the server.
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*/
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/*
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* Prepend RPC message header.
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*/
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mhead = m_gethdr(M_WAIT, MT_DATA);
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mhead->m_next = *data;
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call = mtod(mhead, struct rpc_call *);
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mhead->m_len = sizeof(*call);
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bzero((caddr_t)call, sizeof(*call));
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/* rpc_call part */
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xid++;
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call->rp_xid = txdr_unsigned(xid);
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/* call->rp_direction = 0; */
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call->rp_rpcvers = txdr_unsigned(2);
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call->rp_prog = txdr_unsigned(prog);
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call->rp_vers = txdr_unsigned(vers);
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call->rp_proc = txdr_unsigned(func);
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/* rpc_auth part (auth_unix as root) */
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call->rpc_auth.authtype = txdr_unsigned(RPCAUTH_UNIX);
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call->rpc_auth.authlen = txdr_unsigned(sizeof(struct auth_unix));
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/* rpc_verf part (auth_null) */
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call->rpc_verf.authtype = 0;
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call->rpc_verf.authlen = 0;
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/*
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* Setup packet header
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*/
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len = 0;
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m = mhead;
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while (m) {
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len += m->m_len;
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m = m->m_next;
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}
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mhead->m_pkthdr.len = len;
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mhead->m_pkthdr.rcvif = NULL;
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/*
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* Send it, repeatedly, until a reply is received,
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* but delay each re-send by an increasing amount.
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* If the delay hits the maximum, start complaining.
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*/
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timo = 0;
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for (;;) {
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/* Send RPC request (or re-send). */
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m = m_copym(mhead, 0, M_COPYALL, M_WAIT);
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if (m == NULL) {
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error = ENOBUFS;
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goto out;
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}
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error = sosend(so, (struct sockaddr *)sa, NULL, m,
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NULL, 0, 0);
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if (error) {
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printf("krpc_call: sosend: %d\n", error);
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goto out;
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}
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m = NULL;
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/* Determine new timeout. */
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if (timo < MAX_RESEND_DELAY)
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timo++;
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else
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printf("RPC timeout for server 0x%lx\n",
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(u_long)ntohl(sa->sin_addr.s_addr));
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/*
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* Wait for up to timo seconds for a reply.
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* The socket receive timeout was set to 1 second.
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*/
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secs = timo;
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while (secs > 0) {
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if (from) {
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FREE(from, M_SONAME);
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from = NULL;
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}
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if (m) {
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m_freem(m);
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m = NULL;
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}
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bzero(&auio,sizeof(auio));
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auio.uio_resid = len = 1<<16;
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rcvflg = 0;
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error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
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if (error == EWOULDBLOCK) {
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secs--;
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continue;
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}
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if (error)
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goto out;
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len -= auio.uio_resid;
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/* Does the reply contain at least a header? */
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if (len < MIN_REPLY_HDR)
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continue;
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if (m->m_len < MIN_REPLY_HDR)
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continue;
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reply = mtod(m, struct rpc_reply *);
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/* Is it the right reply? */
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if (reply->rp_direction != txdr_unsigned(RPC_REPLY))
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continue;
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if (reply->rp_xid != txdr_unsigned(xid))
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continue;
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/* Was RPC accepted? (authorization OK) */
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if (reply->rp_astatus != 0) {
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error = fxdr_unsigned(u_int32_t, reply->rp_errno);
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printf("rpc denied, error=%d\n", error);
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continue;
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}
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/* Did the call succeed? */
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if (reply->rp_status != 0) {
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error = fxdr_unsigned(u_int32_t, reply->rp_status);
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if (error == RPC_PROGMISMATCH) {
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error = EBADRPC;
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goto out;
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}
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printf("rpc denied, status=%d\n", error);
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continue;
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}
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goto gotreply; /* break two levels */
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} /* while secs */
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} /* forever send/receive */
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error = ETIMEDOUT;
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goto out;
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gotreply:
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/*
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* Get RPC reply header into first mbuf,
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* get its length, then strip it off.
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*/
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len = sizeof(*reply);
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if (m->m_len < len) {
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m = m_pullup(m, len);
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if (m == NULL) {
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error = ENOBUFS;
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goto out;
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}
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}
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reply = mtod(m, struct rpc_reply *);
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if (reply->rp_auth.authtype != 0) {
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len += fxdr_unsigned(u_int32_t, reply->rp_auth.authlen);
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len = (len + 3) & ~3; /* XXX? */
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}
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m_adj(m, len);
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/* result */
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*data = m;
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if (from_p) {
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*from_p = from;
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from = NULL;
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}
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out:
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if (mhead) m_freem(mhead);
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if (from) free(from, M_SONAME);
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soclose(so);
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return error;
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}
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/*
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* eXternal Data Representation routines.
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* (but with non-standard args...)
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*/
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/*
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* String representation for RPC.
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*/
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struct xdr_string {
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u_int32_t len; /* length without null or padding */
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char data[4]; /* data (longer, of course) */
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/* data is padded to a long-word boundary */
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};
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struct mbuf *
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xdr_string_encode(str, len)
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char *str;
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int len;
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{
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struct mbuf *m;
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struct xdr_string *xs;
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int dlen; /* padded string length */
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int mlen; /* message length */
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dlen = (len + 3) & ~3;
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mlen = dlen + 4;
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if (mlen > MCLBYTES) /* If too big, we just can't do it. */
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return (NULL);
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m = m_get(M_WAIT, MT_DATA);
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if (mlen > MLEN) {
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MCLGET(m, M_WAIT);
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if ((m->m_flags & M_EXT) == 0) {
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(void) m_free(m); /* There can be only one. */
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return (NULL);
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}
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}
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xs = mtod(m, struct xdr_string *);
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m->m_len = mlen;
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xs->len = txdr_unsigned(len);
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bcopy(str, xs->data, len);
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return (m);
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}
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