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/*
* Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995, 1997 NeXT Computer, Inc. All Rights Reserved */
/*
* Copyright (c) 1994 Adam Glass, Gordon Ross
* 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.
*
* History:
* 14-March-97 Dieter Siegmund (dieter@next.com)
* - Use BOOTP instead of RARP to get the IP address at boot time
*
* 23-May-97 Umesh Vaishampayan (umeshv@apple.com)
* - Added the ability to mount "/private" separately.
*
* 30-May-97 Dieter Siegmund (dieter@next.com)
* - Clear out the ireq structure before using it to prevent
* our sending using a bogus source IP address, we should use
* an IP address of all zeroes
* - Right after BOOTP, get the correct netmask using AUTONETMASK
* 18-Jul-97 Dieter Siegmund (dieter@apple.com)
* - we can't restrict the netmask until we have a default route,
* removed AUTONETMASK call (ifdef'd out)
* 5-Aug-97 Dieter Siegmund (dieter@apple.com)
* - use the default route from the bpwhoami call, enabled autonetmask
* again
* 19-Feb-1999 Dieter Siegmund (dieter@apple.com)
* - use new BOOTP routine to get the subnet mask and router
* and stop using SIOCAUTOADDR
* - don't bother mounting private separately if it's not
* specified or not required because they are substrings of
* one another ie. root=host:/A and private=host:/A/private
* - allow the root path to be specified in the boot variable
* "rp" (AKA "rootpath")
* 19-Jul-1999 Dieter Siegmund (dieter@apple.com)
* - replaced big automatic arrays with MALLOC'd data
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/mount_internal.h>
#include <sys/kpi_mbuf.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/krpc.h>
#include <pexpert/pexpert.h>
#include "ether.h"
#include <libkern/libkern.h>
#if NETHER == 0
int nfs_boot_init(__unused struct nfs_diskless *nd)
{
panic("nfs_boot_init: no ether");
}
int nfs_boot_getfh(__unused struct nfs_diskless *nd, __unused int v3, __unused int sotype)
{
panic("nfs_boot_getfh: no ether");
}
#else /* NETHER */
/*
* Support for NFS diskless booting, specifically getting information
* about where to boot from, what pathnames, etc.
*
* This implememtation uses RARP and the bootparam RPC.
* We are forced to implement RPC anyway (to get file handles)
* so we might as well take advantage of it for bootparam too.
*
* The diskless boot sequence goes as follows:
* (1) Use RARP to get our interface address
* (2) Use RPC/bootparam/whoami to get our hostname,
* our IP address, and the server's IP address.
* (3) Use RPC/bootparam/getfile to get the root path
* (4) Use RPC/mountd to get the root file handle
* (5) Use RPC/bootparam/getfile to get the swap path
* (6) Use RPC/mountd to get the swap file handle
*
* (This happens to be the way Sun does it too.)
*/
/* bootparam RPC */
static int bp_whoami(struct sockaddr_in *bpsin,
struct in_addr *my_ip, struct in_addr *gw_ip);
static int bp_getfile(struct sockaddr_in *bpsin, const char *key,
struct sockaddr_in *mdsin, char *servname, char *path);
/* mountd RPC */
static int md_mount(struct sockaddr_in *mdsin, char *path, int v3, int sotype,
u_char *fhp, u_int32_t *fhlenp);
/* other helpers */
static int get_file_handle(struct nfs_dlmount *ndmntp);
#define IP_FORMAT "%d.%d.%d.%d"
#define IP_CH(ip) ((u_char *)ip)
#define IP_LIST(ip) IP_CH(ip)[0],IP_CH(ip)[1],IP_CH(ip)[2],IP_CH(ip)[3]
#include <sys/netboot.h>
/*
* Called with an empty nfs_diskless struct to be filled in.
*/
int
nfs_boot_init(struct nfs_diskless *nd)
{
struct sockaddr_in bp_sin;
boolean_t do_bpwhoami = TRUE;
boolean_t do_bpgetfile = TRUE;
int error = 0;
struct in_addr my_ip;
struct sockaddr_in * sin_p;
/* make sure mbuf constants are set up */
if (!nfs_mbuf_mhlen)
nfs_mbuf_init();
/* by this point, networking must already have been configured */
if (netboot_iaddr(&my_ip) == FALSE) {
printf("nfs_boot: networking is not initialized\n");
error = ENXIO;
goto failed;
}
/* get the root path information */
MALLOC_ZONE(nd->nd_root.ndm_path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
if (!nd->nd_root.ndm_path) {
printf("nfs_boot: can't allocate root path buffer\n");
error = ENOMEM;
goto failed;
}
MALLOC_ZONE(nd->nd_root.ndm_mntfrom, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
if (!nd->nd_root.ndm_mntfrom) {
printf("nfs_boot: can't allocate root mntfrom buffer\n");
error = ENOMEM;
goto failed;
}
sin_p = &nd->nd_root.ndm_saddr;
bzero((caddr_t)sin_p, sizeof(*sin_p));
sin_p->sin_len = sizeof(*sin_p);
sin_p->sin_family = AF_INET;
if (netboot_rootpath(&sin_p->sin_addr, nd->nd_root.ndm_host,
sizeof(nd->nd_root.ndm_host),
nd->nd_root.ndm_path, MAXPATHLEN) == TRUE) {
do_bpgetfile = FALSE;
do_bpwhoami = FALSE;
}
nd->nd_private.ndm_saddr.sin_addr.s_addr = 0;
if (do_bpwhoami) {
struct in_addr router;
/*
* Get client name and gateway address.
* RPC: bootparam/whoami
* Use the old broadcast address for the WHOAMI
* call because we do not yet know our netmask.
* The server address returned by the WHOAMI call
* is used for all subsequent booptaram RPCs.
*/
bzero((caddr_t)&bp_sin, sizeof(bp_sin));
bp_sin.sin_len = sizeof(bp_sin);
bp_sin.sin_family = AF_INET;
bp_sin.sin_addr.s_addr = INADDR_BROADCAST;
hostnamelen = MAXHOSTNAMELEN;
router.s_addr = 0;
error = bp_whoami(&bp_sin, &my_ip, &router);
if (error) {
printf("nfs_boot: bootparam whoami, error=%d", error);
goto failed;
}
printf("nfs_boot: BOOTPARAMS server " IP_FORMAT "\n",
IP_LIST(&bp_sin.sin_addr));
printf("nfs_boot: hostname %s\n", hostname);
}
if (do_bpgetfile) {
error = bp_getfile(&bp_sin, "root", &nd->nd_root.ndm_saddr,
nd->nd_root.ndm_host, nd->nd_root.ndm_path);
if (error) {
printf("nfs_boot: bootparam get root: %d\n", error);
goto failed;
}
}
#if !defined(NO_MOUNT_PRIVATE)
if (do_bpgetfile) { /* get private path */
MALLOC_ZONE(nd->nd_private.ndm_path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
if (!nd->nd_private.ndm_path) {
printf("nfs_boot: can't allocate private path buffer\n");
error = ENOMEM;
goto failed;
}
MALLOC_ZONE(nd->nd_private.ndm_mntfrom, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
if (!nd->nd_private.ndm_mntfrom) {
printf("nfs_boot: can't allocate private host buffer\n");
error = ENOMEM;
goto failed;
}
error = bp_getfile(&bp_sin, "private",
&nd->nd_private.ndm_saddr,
nd->nd_private.ndm_host,
nd->nd_private.ndm_path);
if (!error) {
char * check_path = NULL;
MALLOC_ZONE(check_path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
if (!check_path) {
printf("nfs_boot: can't allocate check_path buffer\n");
error = ENOMEM;
goto failed;
}
snprintf(check_path, MAXPATHLEN, "%s/private", nd->nd_root.ndm_path);
if ((nd->nd_root.ndm_saddr.sin_addr.s_addr
== nd->nd_private.ndm_saddr.sin_addr.s_addr)
&& (strncmp(check_path, nd->nd_private.ndm_path, MAXPATHLEN) == 0)) {
/* private path is prefix of root path, don't mount */
nd->nd_private.ndm_saddr.sin_addr.s_addr = 0;
}
FREE_ZONE(check_path, MAXPATHLEN, M_NAMEI);
}
else {
/* private key not defined, don't mount */
nd->nd_private.ndm_saddr.sin_addr.s_addr = 0;
}
}
else {
error = 0;
}
#endif /* NO_MOUNT_PRIVATE */
failed:
return (error);
}
/*
* Called with a partially initialized nfs_diskless struct
* with file handles to be filled in.
*/
int
nfs_boot_getfh(struct nfs_diskless *nd, int v3, int sotype)
{
int error = 0;
nd->nd_root.ndm_nfsv3 = v3;
nd->nd_root.ndm_sotype = sotype;
error = get_file_handle(&nd->nd_root);
if (error) {
printf("nfs_boot: get_file_handle(v%d) root failed, %d\n",
v3 ? 3 : 2, error);
goto failed;
}
#if !defined(NO_MOUNT_PRIVATE)
if (nd->nd_private.ndm_saddr.sin_addr.s_addr) {
/* get private file handle */
nd->nd_private.ndm_nfsv3 = v3;
nd->nd_private.ndm_sotype = sotype;
error = get_file_handle(&nd->nd_private);
if (error) {
printf("nfs_boot: get_file_handle(v%d) private failed, %d\n",
v3 ? 3 : 2, error);
goto failed;
}
}
#endif /* NO_MOUNT_PRIVATE */
failed:
return (error);
}
static int
get_file_handle(struct nfs_dlmount *ndmntp)
{
char *sp, *dp, *endp;
int error;
/*
* Get file handle for "key" (root or swap)
* using RPC to mountd/mount
*/
error = md_mount(&ndmntp->ndm_saddr, ndmntp->ndm_path, ndmntp->ndm_nfsv3,
ndmntp->ndm_sotype, ndmntp->ndm_fh, &ndmntp->ndm_fhlen);
if (error)
return (error);
/* Construct remote path (for getmntinfo(3)) */
dp = ndmntp->ndm_mntfrom;
endp = dp + MAXPATHLEN - 1;
for (sp = ndmntp->ndm_host; *sp && dp < endp;)
*dp++ = *sp++;
if (dp < endp)
*dp++ = ':';
for (sp = ndmntp->ndm_path; *sp && dp < endp;)
*dp++ = *sp++;
*dp = '\0';
return (0);
}
/*
* Get an mbuf with the given length, and
* initialize the pkthdr length field.
*/
static int
mbuf_get_with_len(size_t msg_len, mbuf_t *m)
{
int error;
error = mbuf_gethdr(MBUF_WAITOK, MBUF_TYPE_DATA, m);
if (error)
return (error);
if (msg_len > mbuf_maxlen(*m)) {
error = mbuf_mclget(MBUF_WAITOK, MBUF_TYPE_DATA, m);
if (error) {
mbuf_freem(*m);
return (error);
}
if (msg_len > mbuf_maxlen(*m))
panic("nfs_boot: msg_len > MCLBYTES");
}
mbuf_setlen(*m, msg_len);
mbuf_pkthdr_setlen(*m, msg_len);
return (0);
}
/*
* String representation for RPC.
*/
struct rpc_string {
u_int32_t len; /* length without null or padding */
u_char data[4]; /* data (longer, of course) */
/* data is padded to a long-word boundary */
};
/* Compute space used given string length. */
#define RPC_STR_SIZE(slen) (4 + ((slen + 3) & ~3))
/*
* Inet address in RPC messages
* (Note, really four 32-bit ints, NOT chars. Blech.)
*/
struct bp_inaddr {
u_int32_t atype;
int32_t addr[4];
};
/*
* RPC: bootparam/whoami
* Given client IP address, get:
* client name (hostname)
* domain name (domainname)
* gateway address
*
* The hostname and domainname are set here for convenience.
*
* Note - bpsin is initialized to the broadcast address,
* and will be replaced with the bootparam server address
* after this call is complete. Have to use PMAP_PROC_CALL
* to make sure we get responses only from a servers that
* know about us (don't want to broadcast a getport call).
*/
static int
bp_whoami(struct sockaddr_in *bpsin,
struct in_addr *my_ip,
struct in_addr *gw_ip)
{
/* RPC structures for PMAPPROC_CALLIT */
struct whoami_call {
u_int32_t call_prog;
u_int32_t call_vers;
u_int32_t call_proc;
u_int32_t call_arglen;
struct bp_inaddr call_ia;
} *call;
struct rpc_string *str;
struct bp_inaddr *bia;
mbuf_t m;
struct sockaddr_in sin;
int error;
size_t msg_len, cn_len, dn_len;
u_char *p;
int32_t *lp;
/*
* Get message buffer of sufficient size.
*/
msg_len = sizeof(*call);
error = mbuf_get_with_len(msg_len, &m);
if (error)
return error;
/*
* Build request message for PMAPPROC_CALLIT.
*/
call = mbuf_data(m);
call->call_prog = htonl(BOOTPARAM_PROG);
call->call_vers = htonl(BOOTPARAM_VERS);
call->call_proc = htonl(BOOTPARAM_WHOAMI);
call->call_arglen = htonl(sizeof(struct bp_inaddr));
/* client IP address */
call->call_ia.atype = htonl(1);
p = (u_char*)my_ip;
lp = call->call_ia.addr;
*lp++ = htonl(*p); p++;
*lp++ = htonl(*p); p++;
*lp++ = htonl(*p); p++;
*lp++ = htonl(*p); p++;
/* RPC: portmap/callit */
bpsin->sin_port = htons(PMAPPORT);
error = krpc_call(bpsin, SOCK_DGRAM, PMAPPROG, PMAPVERS, PMAPPROC_CALLIT, &m, &sin);
if (error)
return error;
/*
* Parse result message.
*/
msg_len = mbuf_len(m);
lp = mbuf_data(m);
/* bootparam server port (also grab from address). */
if (msg_len < sizeof(*lp))
goto bad;
msg_len -= sizeof(*lp);
bpsin->sin_port = htons((short)ntohl(*lp++));
bpsin->sin_addr.s_addr = sin.sin_addr.s_addr;
/* length of encapsulated results */
if (msg_len < (ntohl(*lp) + sizeof(*lp)))
goto bad;
msg_len = ntohl(*lp++);
p = (u_char*)lp;
/* client name */
if (msg_len < sizeof(*str))
goto bad;
str = (struct rpc_string *)p;
cn_len = ntohl(str->len);
if (msg_len < cn_len)
goto bad;
if (cn_len >= MAXHOSTNAMELEN)
goto bad;
bcopy(str->data, hostname, cn_len);
hostname[cn_len] = '\0';
hostnamelen = cn_len;
p += RPC_STR_SIZE(cn_len);
msg_len -= RPC_STR_SIZE(cn_len);
/* domain name */
if (msg_len < sizeof(*str))
goto bad;
str = (struct rpc_string *)p;
dn_len = ntohl(str->len);
if (msg_len < dn_len)
goto bad;
if (dn_len >= MAXHOSTNAMELEN)
goto bad;
bcopy(str->data, domainname, dn_len);
domainname[dn_len] = '\0';
domainnamelen = dn_len;
p += RPC_STR_SIZE(dn_len);
msg_len -= RPC_STR_SIZE(dn_len);
/* gateway address */
if (msg_len < sizeof(*bia))
goto bad;
bia = (struct bp_inaddr *)p;
if (bia->atype != htonl(1))
goto bad;
p = (u_char*)gw_ip;
*p++ = ntohl(bia->addr[0]);
*p++ = ntohl(bia->addr[1]);
*p++ = ntohl(bia->addr[2]);
*p++ = ntohl(bia->addr[3]);
goto out;
bad:
printf("nfs_boot: bootparam_whoami: bad reply\n");
error = EBADRPC;
out:
mbuf_freem(m);
return(error);
}
/*
* RPC: bootparam/getfile
* Given client name and file "key", get:
* server name
* server IP address
* server pathname
*/
static int
bp_getfile(struct sockaddr_in *bpsin,
const char *key,
struct sockaddr_in *md_sin,
char *serv_name,
char *pathname)
{
struct rpc_string *str;
mbuf_t m;
struct bp_inaddr *bia;
struct sockaddr_in *sin;
u_char *p, *q;
int error, msg_len;
int cn_len, key_len, sn_len, path_len;
/*
* Get message buffer of sufficient size.
*/
cn_len = hostnamelen;
key_len = strlen(key);
msg_len = 0;
msg_len += RPC_STR_SIZE(cn_len);
msg_len += RPC_STR_SIZE(key_len);
error = mbuf_get_with_len(msg_len, &m);
if (error)
return error;
/*
* Build request message.
*/
p = mbuf_data(m);
bzero(p, msg_len);
/* client name (hostname) */
str = (struct rpc_string *)p;
str->len = htonl(cn_len);
bcopy(hostname, str->data, cn_len);
p += RPC_STR_SIZE(cn_len);
/* key name (root or swap) */
str = (struct rpc_string *)p;
str->len = htonl(key_len);
bcopy(key, str->data, key_len);
/* RPC: bootparam/getfile */
error = krpc_call(bpsin, SOCK_DGRAM, BOOTPARAM_PROG, BOOTPARAM_VERS,
BOOTPARAM_GETFILE, &m, NULL);
if (error)
return error;
/*
* Parse result message.
*/
p = mbuf_data(m);
msg_len = mbuf_len(m);
/* server name */
if (msg_len < (int)sizeof(*str))
goto bad;
str = (struct rpc_string *)p;
sn_len = ntohl(str->len);
if (msg_len < sn_len)
goto bad;
if (sn_len >= MAXHOSTNAMELEN)
goto bad;
bcopy(str->data, serv_name, sn_len);
serv_name[sn_len] = '\0';
p += RPC_STR_SIZE(sn_len);
msg_len -= RPC_STR_SIZE(sn_len);
/* server IP address (mountd) */
if (msg_len < (int)sizeof(*bia))
goto bad;
bia = (struct bp_inaddr *)p;
if (bia->atype != htonl(1))
goto bad;
sin = md_sin;
bzero((caddr_t)sin, sizeof(*sin));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
q = (u_char*) &sin->sin_addr;
*q++ = ntohl(bia->addr[0]);
*q++ = ntohl(bia->addr[1]);
*q++ = ntohl(bia->addr[2]);
*q++ = ntohl(bia->addr[3]);
p += sizeof(*bia);
msg_len -= sizeof(*bia);
/* server pathname */
if (msg_len < (int)sizeof(*str))
goto bad;
str = (struct rpc_string *)p;
path_len = ntohl(str->len);
if (msg_len < path_len)
goto bad;
if (path_len >= MAXPATHLEN)
goto bad;
bcopy(str->data, pathname, path_len);
pathname[path_len] = '\0';
goto out;
bad:
printf("nfs_boot: bootparam_getfile: bad reply\n");
error = EBADRPC;
out:
mbuf_freem(m);
return(0);
}
/*
* RPC: mountd/mount
* Given a server pathname, get an NFS file handle.
* Also, sets sin->sin_port to the NFS service port.
*/
static int
md_mount(struct sockaddr_in *mdsin, /* mountd server address */
char *path,
int v3,
int sotype,
u_char *fhp,
u_int32_t *fhlenp)
{
/* The RPC structures */
struct rpc_string *str;
struct rdata {
u_int32_t errno;
u_char data[NFSX_V3FHMAX + sizeof(u_int32_t)];
} *rdata;
mbuf_t m;
int error, mlen, slen;
int mntversion = v3 ? RPCMNT_VER3 : RPCMNT_VER1;
int proto = (sotype == SOCK_STREAM) ? IPPROTO_TCP : IPPROTO_UDP;
in_port_t mntport, nfsport;
/* Get port number for MOUNTD. */
error = krpc_portmap(mdsin, RPCPROG_MNT, mntversion, proto, &mntport);
if (error)
return error;
/* Get port number for NFS use. */
/* (If NFS/proto unavailable, don't bother with the mount call) */
error = krpc_portmap(mdsin, NFS_PROG, v3 ? NFS_VER3 : NFS_VER2, proto, &nfsport);
if (error)
return error;
/* Set port number for MOUNTD */
mdsin->sin_port = mntport;
slen = strlen(path);
mlen = RPC_STR_SIZE(slen);
error = mbuf_get_with_len(mlen, &m);
if (error)
return error;
str = mbuf_data(m);
str->len = htonl(slen);
bcopy(path, str->data, slen);
/* Do RPC to mountd. */
error = krpc_call(mdsin, sotype, RPCPROG_MNT, mntversion, RPCMNT_MOUNT, &m, NULL);
if (error)
return error; /* message already freed */
/*
* the reply must be long enough to hold the errno plus either of:
* + a v2 filehandle
* + a v3 filehandle length + a v3 filehandle
*/
mlen = mbuf_len(m);
if (mlen < (int)sizeof(u_int32_t))
goto bad;
rdata = mbuf_data(m);
error = ntohl(rdata->errno);
if (error)
goto out;
if (v3) {
u_int32_t fhlen;
u_char *fh;
if (mlen < (int)sizeof(u_int32_t)*2)
goto bad;
fhlen = ntohl(*(u_int32_t*)rdata->data);
fh = rdata->data + sizeof(u_int32_t);
if (mlen < (int)(sizeof(u_int32_t)*2 + fhlen))
goto bad;
bcopy(fh, fhp, fhlen);
*fhlenp = fhlen;
} else {
if (mlen < ((int)sizeof(u_int32_t) + NFSX_V2FH))
goto bad;
bcopy(rdata->data, fhp, NFSX_V2FH);
*fhlenp = NFSX_V2FH;
}
/* Set port number for NFS use. */
mdsin->sin_port = nfsport;
goto out;
bad:
error = EBADRPC;
out:
mbuf_freem(m);
return error;
}
#endif /* NETHER */