413 lines
10 KiB
C
413 lines
10 KiB
C
/* $NetBSD: krpc_subr.c,v 1.6 1994/08/12 04:31:51 cgd Exp $ */
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/*
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* Copyright (c) 1994 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/conf.h>
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#include <sys/ioctl.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <sys/reboot.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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/*
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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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* Note: will not work on variable-sized rpc args/results.
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* implicit size-limit of an mbuf.
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*/
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#define PMAPPORT 111
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#define PMAPPROG 100000
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#define PMAPVERS 2
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#define PMAPPROC_GETPORT 3
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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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int rp_atype; /* auth type */
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u_long rp_alen; /* auth length */
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};
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struct rpc_call {
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u_long rp_xid; /* request transaction id */
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int rp_direction; /* call direction (0) */
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u_long rp_rpcvers; /* rpc version (2) */
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u_long rp_prog; /* program */
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u_long rp_vers; /* version */
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u_long rp_proc; /* procedure */
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struct auth_info rp_auth;
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struct auth_info rp_verf;
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};
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struct rpc_reply {
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u_long rp_xid; /* request transaction id */
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int rp_direction; /* call direction (1) */
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int rp_astatus; /* accept status (0: accepted) */
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union {
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u_long rpu_errno;
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struct {
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struct auth_info rp_auth;
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u_long rp_rstatus; /* reply status */
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} rpu_ok;
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} rp_u;
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};
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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(sa, prog, vers, portp)
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struct sockaddr *sa; /* server address */
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u_long prog, vers; /* host order */
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u_short *portp; /* network order */
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{
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struct sdata {
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u_long prog; /* call program */
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u_long vers; /* call version */
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u_long proto; /* call protocol */
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u_long port; /* call port (unused) */
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} *sdata;
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struct rdata {
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u_short pad;
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u_short 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_gethdr(M_WAIT, MT_DATA);
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if (m == NULL)
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return ENOBUFS;
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m->m_len = sizeof(*sdata);
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m->m_pkthdr.len = m->m_len;
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sdata = mtod(m, struct sdata *);
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/* Do the RPC to get it. */
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sdata->prog = htonl(prog);
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sdata->vers = htonl(vers);
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sdata->proto = htonl(IPPROTO_UDP);
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sdata->port = 0;
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error = krpc_call(sa, PMAPPROG, PMAPVERS,
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PMAPPROC_GETPORT, &m);
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if (error)
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return error;
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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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*/
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int
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krpc_call(sa, prog, vers, func, data)
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struct sockaddr *sa;
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u_long prog, vers, func;
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struct mbuf **data; /* input/output */
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{
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struct socket *so;
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struct sockaddr_in *sin;
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struct timeval *tv;
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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 uio auio;
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int error, rcvflg, timo, secs, len;
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static u_long xid = ~0xFF;
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u_short 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->sa_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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/*
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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)))
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goto out;
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m = m_get(M_WAIT, MT_SOOPTS);
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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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tv = mtod(m, struct timeval *);
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m->m_len = sizeof(*tv);
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tv->tv_sec = 1;
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tv->tv_usec = 0;
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if ((error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m)))
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goto out;
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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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m = m_getclr(M_WAIT, MT_SONAME);
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sin = mtod(m, struct sockaddr_in *);
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sin->sin_len = m->m_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, m);
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} while (error == EADDRINUSE &&
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tport > IPPORT_RESERVED / 2);
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m_freem(m);
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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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nam = m_get(M_WAIT, MT_SONAME);
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if (nam == NULL) {
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error = ENOBUFS;
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goto out;
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}
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sin = mtod(nam, struct sockaddr_in *);
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bcopy((caddr_t)sa, (caddr_t)sin, (nam->m_len = sa->sa_len));
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/*
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* Set the port number that the request will use.
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*/
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if ((error = krpc_portmap(sa, prog, vers, &sin->sin_port)))
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goto out;
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/*
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* Prepend RPC message header.
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*/
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m = *data;
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*data = NULL;
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#ifdef DIAGNOSTIC
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("krpc_call: send data w/o pkthdr");
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if (m->m_pkthdr.len < m->m_len)
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panic("krpc_call: pkthdr.len not set");
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#endif
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mhead = m_prepend(m, sizeof(*call), M_WAIT);
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if (mhead == NULL) {
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error = ENOBUFS;
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goto out;
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}
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mhead->m_pkthdr.len += sizeof(*call);
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mhead->m_pkthdr.rcvif = NULL;
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/*
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* Fill in the RPC header
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*/
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call = mtod(mhead, struct rpc_call *);
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bzero((caddr_t)call, sizeof(*call));
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call->rp_xid = ++xid; /* no need to put in network order */
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/* call->rp_direction = 0; */
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call->rp_rpcvers = htonl(2);
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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(func);
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/* call->rp_auth = 0; */
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/* call->rp_verf = 0; */
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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, nam, NULL, m, NULL, 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%x\n",
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ntohl(sin->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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auio.uio_resid = len = 1<<16;
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rcvflg = 0;
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error = soreceive(so, NULL, &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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/* Is the reply complete and the right one? */
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if (len < MIN_REPLY_HDR) {
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m_freem(m);
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continue;
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}
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if (m->m_len < MIN_REPLY_HDR) {
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m = m_pullup(m, MIN_REPLY_HDR);
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if (!m)
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continue;
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}
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reply = mtod(m, struct rpc_reply *);
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if ((reply->rp_direction == htonl(RPC_REPLY)) &&
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(reply->rp_xid == xid))
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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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* Pull as much as we can into first mbuf, to make
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* result buffer contiguous. Note that if the entire
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* result won't fit into one mbuf, you're out of luck.
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* XXX - Should not rely on making the entire reply
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* contiguous (fix callers instead). -gwr
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*/
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#ifdef DIAGNOSTIC
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("krpc_call: received pkt w/o header?");
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#endif
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len = m->m_pkthdr.len;
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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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/*
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* Check RPC acceptance and status.
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*/
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if (reply->rp_astatus != 0) {
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error = ntohl(reply->rp_u.rpu_errno);
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printf("rpc denied, error=%d\n", error);
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m_freem(m);
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goto out;
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}
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if ((error = ntohl(reply->rp_u.rpu_ok.rp_rstatus)) != 0) {
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printf("rpc status=%d\n", error);
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m_freem(m);
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goto out;
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}
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/*
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* Strip RPC header
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*/
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len = sizeof(*reply);
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if (reply->rp_u.rpu_ok.rp_auth.rp_atype != 0) {
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len += ntohl(reply->rp_u.rpu_ok.rp_auth.rp_alen);
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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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out:
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if (nam) m_freem(nam);
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if (mhead) m_freem(mhead);
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soclose(so);
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return error;
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}
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