NetBSD/sys/nfs/krpc_subr.c

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/* $NetBSD: krpc_subr.c,v 1.7 1994/09/26 16:42:31 gwr Exp $ */
/*
* Copyright (c) 1994 Gordon Ross, Adam Glass
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* partially based on:
* libnetboot/rpc.c
* @(#) Header: rpc.c,v 1.12 93/09/28 08:31:56 leres Exp (LBL)
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <net/if.h>
#include <netinet/in.h>
#include <nfs/rpcv2.h>
#include <nfs/krpc.h>
/*
* Kernel support for Sun RPC
*
* Used currently for bootstrapping in nfs diskless configurations.
*
* Note: will not work on variable-sized rpc args/results.
* implicit size-limit of an mbuf.
*/
/*
* Generic RPC headers
*/
struct auth_info {
int rp_atype; /* auth type */
u_long rp_alen; /* auth length */
};
struct rpc_call {
u_long rp_xid; /* request transaction id */
int rp_direction; /* call direction (0) */
u_long rp_rpcvers; /* rpc version (2) */
u_long rp_prog; /* program */
u_long rp_vers; /* version */
u_long rp_proc; /* procedure */
struct auth_info rp_auth;
struct auth_info rp_verf;
};
struct rpc_reply {
u_long rp_xid; /* request transaction id */
int rp_direction; /* call direction (1) */
int rp_astatus; /* accept status (0: accepted) */
union {
u_long rpu_errno;
struct {
struct auth_info rp_auth;
u_long rp_rstatus; /* reply status */
} rpu_ok;
} rp_u;
};
#define MIN_REPLY_HDR 16 /* xid, dir, astat, errno */
/*
* What is the longest we will wait before re-sending a request?
* Note this is also the frequency of "RPC timeout" messages.
* The re-send loop count sup linearly to this maximum, so the
* first complaint will happen after (1+2+3+4+5)=15 seconds.
*/
#define MAX_RESEND_DELAY 5 /* seconds */
/*
* Call portmap to lookup a port number for a particular rpc program
* Returns non-zero error on failure.
*/
int
krpc_portmap(sin, prog, vers, portp)
struct sockaddr_in *sin; /* server address */
u_long prog, vers; /* host order */
u_short *portp; /* network order */
{
struct sdata {
u_long prog; /* call program */
u_long vers; /* call version */
u_long proto; /* call protocol */
u_long port; /* call port (unused) */
} *sdata;
struct rdata {
u_short pad;
u_short port;
} *rdata;
struct mbuf *m;
int error;
/* The portmapper port is fixed. */
if (prog == PMAPPROG) {
*portp = htons(PMAPPORT);
return 0;
}
m = m_gethdr(M_WAIT, MT_DATA);
if (m == NULL)
return ENOBUFS;
m->m_len = sizeof(*sdata);
m->m_pkthdr.len = m->m_len;
sdata = mtod(m, struct sdata *);
/* Do the RPC to get it. */
sdata->prog = htonl(prog);
sdata->vers = htonl(vers);
sdata->proto = htonl(IPPROTO_UDP);
sdata->port = 0;
sin->sin_port = htons(PMAPPORT);
error = krpc_call(sin, PMAPPROG, PMAPVERS,
PMAPPROC_GETPORT, &m, NULL);
if (error)
return error;
rdata = mtod(m, struct rdata *);
*portp = rdata->port;
m_freem(m);
return 0;
}
/*
* Do a remote procedure call (RPC) and wait for its reply.
* If from_p is non-null, then we are doing broadcast, and
* the address from whence the response came is saved there.
*/
int
krpc_call(sa, prog, vers, func, data, from_p)
struct sockaddr_in *sa;
u_long prog, vers, func;
struct mbuf **data; /* input/output */
struct mbuf **from_p; /* output */
{
struct socket *so;
struct sockaddr_in *sin;
struct mbuf *m, *nam, *mhead, *from;
struct rpc_call *call;
struct rpc_reply *reply;
struct uio auio;
int error, rcvflg, timo, secs, len;
static u_long xid = ~0xFF;
u_short tport;
/*
* Validate address family.
* Sorry, this is INET specific...
*/
if (sa->sin_family != AF_INET)
return (EAFNOSUPPORT);
/* Free at end if not null. */
nam = mhead = NULL;
from = NULL;
/*
* Create socket and set its recieve timeout.
*/
if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)))
goto out;
m = m_get(M_WAIT, MT_SOOPTS);
if (m == NULL) {
error = ENOBUFS;
goto out;
} else {
struct timeval *tv;
tv = mtod(m, struct timeval *);
m->m_len = sizeof(*tv);
tv->tv_sec = 1;
tv->tv_usec = 0;
if ((error = sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m)))
goto out;
}
/*
* Enable broadcast if necessary.
*/
if (from_p) {
int *on;
m = m_get(M_WAIT, MT_SOOPTS);
if (m == NULL) {
error = ENOBUFS;
goto out;
}
on = mtod(m, int *);
m->m_len = sizeof(*on);
*on = 1;
if ((error = sosetopt(so, SOL_SOCKET, SO_BROADCAST, m)))
goto out;
}
/*
* Bind the local endpoint to a reserved port,
* because some NFS servers refuse requests from
* non-reserved (non-privileged) ports.
*/
m = m_getclr(M_WAIT, MT_SONAME);
sin = mtod(m, struct sockaddr_in *);
sin->sin_len = m->m_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_ANY;
tport = IPPORT_RESERVED;
do {
tport--;
sin->sin_port = htons(tport);
error = sobind(so, m);
} while (error == EADDRINUSE &&
tport > IPPORT_RESERVED / 2);
m_freem(m);
if (error) {
printf("bind failed\n");
goto out;
}
/*
* Setup socket address for the server.
*/
nam = m_get(M_WAIT, MT_SONAME);
if (nam == NULL) {
error = ENOBUFS;
goto out;
}
sin = mtod(nam, struct sockaddr_in *);
bcopy((caddr_t)sa, (caddr_t)sin, (nam->m_len = sa->sin_len));
/*
* Prepend RPC message header.
*/
m = *data;
*data = NULL;
#ifdef DIAGNOSTIC
if ((m->m_flags & M_PKTHDR) == 0)
panic("krpc_call: send data w/o pkthdr");
if (m->m_pkthdr.len < m->m_len)
panic("krpc_call: pkthdr.len not set");
#endif
mhead = m_prepend(m, sizeof(*call), M_WAIT);
if (mhead == NULL) {
error = ENOBUFS;
goto out;
}
mhead->m_pkthdr.len += sizeof(*call);
mhead->m_pkthdr.rcvif = NULL;
/*
* Fill in the RPC header
*/
call = mtod(mhead, struct rpc_call *);
bzero((caddr_t)call, sizeof(*call));
xid++;
call->rp_xid = htonl(xid);
/* call->rp_direction = 0; */
call->rp_rpcvers = htonl(2);
call->rp_prog = htonl(prog);
call->rp_vers = htonl(vers);
call->rp_proc = htonl(func);
/* call->rp_auth = 0; */
/* call->rp_verf = 0; */
/*
* Send it, repeatedly, until a reply is received,
* but delay each re-send by an increasing amount.
* If the delay hits the maximum, start complaining.
*/
timo = 0;
for (;;) {
/* Send RPC request (or re-send). */
m = m_copym(mhead, 0, M_COPYALL, M_WAIT);
if (m == NULL) {
error = ENOBUFS;
goto out;
}
error = sosend(so, nam, NULL, m, NULL, 0);
if (error) {
printf("krpc_call: sosend: %d\n", error);
goto out;
}
m = NULL;
/* Determine new timeout. */
if (timo < MAX_RESEND_DELAY)
timo++;
else
printf("RPC timeout for server 0x%x\n",
ntohl(sin->sin_addr.s_addr));
/*
* Wait for up to timo seconds for a reply.
* The socket receive timeout was set to 1 second.
*/
secs = timo;
while (secs > 0) {
if (from) {
m_freem(from);
from = NULL;
}
if (m) {
m_freem(m);
m = NULL;
}
auio.uio_resid = len = 1<<16;
rcvflg = 0;
error = soreceive(so, &from, &auio, &m, NULL, &rcvflg);
if (error == EWOULDBLOCK) {
secs--;
continue;
}
if (error)
goto out;
len -= auio.uio_resid;
/* Does the reply contain at least a header? */
if (len < MIN_REPLY_HDR)
continue;
if (m->m_len < MIN_REPLY_HDR)
continue;
reply = mtod(m, struct rpc_reply *);
/* Is it the right reply? */
if (reply->rp_direction != htonl(RPC_REPLY))
continue;
if (reply->rp_xid != htonl(xid))
continue;
/* Was RPC accepted? (authorization OK) */
if (reply->rp_astatus != 0) {
error = ntohl(reply->rp_u.rpu_errno);
printf("rpc denied, error=%d\n", error);
continue;
}
/* Did the call succeed? */
if ((error = ntohl(reply->rp_u.rpu_ok.rp_rstatus)) != 0) {
printf("rpc status=%d\n", error);
continue;
}
goto gotreply; /* break two levels */
} /* while secs */
} /* forever send/receive */
1994-06-30 14:45:03 +04:00
error = ETIMEDOUT;
goto out;
gotreply:
/*
* Pull as much as we can into first mbuf, to make
* result buffer contiguous. Note that if the entire
1994-08-12 08:31:51 +04:00
* result won't fit into one mbuf, you're out of luck.
* XXX - Should not rely on making the entire reply
* contiguous (fix callers instead). -gwr
*/
#ifdef DIAGNOSTIC
if ((m->m_flags & M_PKTHDR) == 0)
panic("krpc_call: received pkt w/o header?");
#endif
len = m->m_pkthdr.len;
if (m->m_len < len) {
m = m_pullup(m, len);
if (m == NULL) {
error = ENOBUFS;
goto out;
}
reply = mtod(m, struct rpc_reply *);
}
/*
* Strip RPC header
*/
len = sizeof(*reply);
if (reply->rp_u.rpu_ok.rp_auth.rp_atype != 0) {
len += ntohl(reply->rp_u.rpu_ok.rp_auth.rp_alen);
len = (len + 3) & ~3; /* XXX? */
}
m_adj(m, len);
/* result */
*data = m;
if (from_p) {
*from_p = from;
from = NULL;
}
out:
if (nam) m_freem(nam);
if (mhead) m_freem(mhead);
if (from) m_freem(from);
soclose(so);
return error;
}