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propagator/nfsmount.c

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Initial revision
2004-01-20 21:32:43 +03:00
/*
* Guillaume Cottenceau (gc@mandrakesoft.com)
*
* Copyright 2003 MandrakeSoft
*
* This software may be freely redistributed under the terms of the GNU
* public license.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* basing on nfsmount.c from util-linux-2.11z:
* - use our logging facilities
* - use our host resolving stuff
* - remove unneeded code
*/
/*
* nfsmount.c -- Linux NFS mount
* Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port
* numbers to be specified on the command line.
*
* Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>:
* Omit the call to connect() for Linux version 1.3.11 or later.
*
* Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com>
* Implemented the "bg", "fg" and "retry" mount options for NFS.
*
* 1999-02-22 Arkadiusz Mi<EFBFBD>kiewicz <misiek@pld.ORG.PL>
* - added Native Language Support
*
* Modified by Olaf Kirch and Trond Myklebust for new NFS code,
* plus NFSv3 stuff.
*
* 2003-04-14 David Black <david.black@xilinx.com>
* - added support for multiple hostname NFS mounts
*/
/*
* nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
*/
#define HAVE_rpcsvc_nfs_prot_h
#define HAVE_inet_aton
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>
#include <time.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
//#include <sys/socket.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
// #include <values.h>
#include "nfsmount.h"
#ifdef HAVE_rpcsvc_nfs_prot_h
#include <rpcsvc/nfs_prot.h>
#else
#include <linux/nfs.h>
#define nfsstat nfs_stat
#endif
#include "nfs_mount4.h"
#include "log.h"
#include "dns.h"
#ifndef NFS_PORT
#define NFS_PORT 2049
#endif
#ifndef NFS_FHSIZE
#define NFS_FHSIZE 32
#endif
static char *nfs_strerror(int stat);
#define MAKE_VERSION(p,q,r) (65536*(p) + 256*(q) + (r))
#define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
bool_t
xdr_fhandle3 (XDR *xdrs, fhandle3 *objp)
{
if (!xdr_bytes (xdrs, (char **)&objp->fhandle3_val, (u_int *) &objp->fhandle3_len, FHSIZE3))
return FALSE;
return TRUE;
}
bool_t
xdr_mountstat3 (XDR *xdrs, mountstat3 *objp)
{
if (!xdr_enum (xdrs, (enum_t *) objp))
return FALSE;
return TRUE;
}
bool_t
xdr_mountres3_ok (XDR *xdrs, mountres3_ok *objp)
{
if (!xdr_fhandle3 (xdrs, &objp->fhandle))
return FALSE;
if (!xdr_array (xdrs, (char **)&objp->auth_flavours.auth_flavours_val, (u_int *) &objp->auth_flavours.auth_flavours_len, ~0,
sizeof (int), (xdrproc_t) xdr_int))
return FALSE;
return TRUE;
}
bool_t
xdr_mountres3 (XDR *xdrs, mountres3 *objp)
{
if (!xdr_mountstat3 (xdrs, &objp->fhs_status))
return FALSE;
switch (objp->fhs_status) {
case MNT_OK:
if (!xdr_mountres3_ok (xdrs, &objp->mountres3_u.mountinfo))
return FALSE;
break;
default:
break;
}
return TRUE;
}
bool_t
xdr_dirpath (XDR *xdrs, dirpath *objp)
{
if (!xdr_string (xdrs, objp, MNTPATHLEN))
return FALSE;
return TRUE;
}
bool_t
xdr_fhandle (XDR *xdrs, fhandle objp)
{
if (!xdr_opaque (xdrs, objp, FHSIZE))
return FALSE;
return TRUE;
}
bool_t
xdr_fhstatus (XDR *xdrs, fhstatus *objp)
{
if (!xdr_u_int (xdrs, &objp->fhs_status))
return FALSE;
switch (objp->fhs_status) {
case 0:
if (!xdr_fhandle (xdrs, objp->fhstatus_u.fhs_fhandle))
return FALSE;
break;
default:
break;
}
return TRUE;
}
static int
linux_version_code(void) {
struct utsname my_utsname;
int p, q, r;
if (uname(&my_utsname) == 0) {
p = atoi(strtok(my_utsname.release, "."));
q = atoi(strtok(NULL, "."));
r = atoi(strtok(NULL, "."));
return MAKE_VERSION(p,q,r);
}
return 0;
}
/*
* Unfortunately, the kernel prints annoying console messages
* in case of an unexpected nfs mount version (instead of
* just returning some error). Therefore we'll have to try
* and figure out what version the kernel expects.
*
* Variables:
* NFS_MOUNT_VERSION: these nfsmount sources at compile time
* nfs_mount_version: version this source and running kernel can handle
*/
static int
find_kernel_nfs_mount_version(void) {
static int kernel_version = -1;
int nfs_mount_version = NFS_MOUNT_VERSION;
if (kernel_version == -1)
kernel_version = linux_version_code();
if (kernel_version) {
if (kernel_version < MAKE_VERSION(2,1,32))
nfs_mount_version = 1;
else if (kernel_version < MAKE_VERSION(2,2,18))
nfs_mount_version = 3;
else if (kernel_version < MAKE_VERSION(2,3,0))
nfs_mount_version = 4; /* since 2.2.18pre9 */
else if (kernel_version < MAKE_VERSION(2,3,99))
nfs_mount_version = 3;
else
nfs_mount_version = 4; /* since 2.3.99pre4 */
}
if (nfs_mount_version > NFS_MOUNT_VERSION)
nfs_mount_version = NFS_MOUNT_VERSION;
log_message("nfsmount: kernel_nfs_mount_version: %d", nfs_mount_version);
return nfs_mount_version;
}
static struct pmap *
get_mountport(struct sockaddr_in *server_addr,
long unsigned prog,
long unsigned version,
long unsigned proto,
long unsigned port,
int nfs_mount_version)
{
struct pmaplist *pmap;
static struct pmap p = {0, 0, 0, 0};
if (version > MAX_NFSPROT)
version = MAX_NFSPROT;
if (!prog)
prog = MOUNTPROG;
p.pm_prog = prog;
p.pm_vers = version;
p.pm_prot = proto;
p.pm_port = port;
server_addr->sin_port = PMAPPORT;
pmap = pmap_getmaps(server_addr);
while (pmap) {
if (pmap->pml_map.pm_prog != prog)
goto next;
if (!version && p.pm_vers > pmap->pml_map.pm_vers)
goto next;
if (version > 2 && pmap->pml_map.pm_vers != version)
goto next;
if (version && version <= 2 && pmap->pml_map.pm_vers > 2)
goto next;
if (pmap->pml_map.pm_vers > MAX_NFSPROT ||
(proto && p.pm_prot && pmap->pml_map.pm_prot != proto) ||
(port && pmap->pml_map.pm_port != port))
goto next;
memcpy(&p, &pmap->pml_map, sizeof(p));
next:
pmap = pmap->pml_next;
}
if (!p.pm_vers)
p.pm_vers = MOUNTVERS;
if (!p.pm_prot)
p.pm_prot = IPPROTO_TCP;
return &p;
}
int nfsmount_prepare(const char *spec, char **mount_opts)
{
char hostdir[1024];
CLIENT *mclient;
char *hostname, *dirname, *mounthost = NULL;
struct timeval total_timeout;
enum clnt_stat clnt_stat;
static struct nfs_mount_data data;
int nfs_mount_version;
int val;
struct sockaddr_in server_addr;
struct sockaddr_in mount_server_addr;
struct pmap *pm_mnt;
int msock, fsock;
struct timeval retry_timeout;
union {
struct fhstatus nfsv2;
struct mountres3 nfsv3;
} status;
char *s;
int port, mountport, proto, soft, intr;
int posix, nocto, noac, broken_suid, nolock;
int retry, tcp;
int mountprog, mountvers, nfsprog, nfsvers;
int retval;
time_t t;
time_t prevt;
time_t timeout;
nfs_mount_version = find_kernel_nfs_mount_version();
retval = -1;
msock = fsock = -1;
mclient = NULL;
if (strlen(spec) >= sizeof(hostdir)) {
log_message("nfsmount: excessively long host:dir argument");
goto fail;
}
strcpy(hostdir, spec);
if ((s = strchr(hostdir, ':'))) {
hostname = hostdir;
dirname = s + 1;
*s = '\0';
} else {
log_message("nfsmount: directory to mount not in host:dir format");
goto fail;
}
server_addr.sin_family = AF_INET;
#ifdef HAVE_inet_aton
if (!inet_aton(hostname, &server_addr.sin_addr))
#endif
{
if (mygethostbyname(hostname, &server_addr.sin_addr)) {
log_message("nfsmount: can't get address for %s", hostname);
goto fail;
}
}
memcpy (&mount_server_addr, &server_addr, sizeof (mount_server_addr));
/* Set default options.
* rsize/wsize (and bsize, for ver >= 3) are left 0 in order to
* let the kernel decide.
* timeo is filled in after we know whether it'll be TCP or UDP. */
memset(&data, 0, sizeof(data));
data.retrans = 3;
data.acregmin = 3;
data.acregmax = 60;
data.acdirmin = 30;
data.acdirmax = 60;
#if NFS_MOUNT_VERSION >= 2
data.namlen = NAME_MAX;
#endif
soft = 1;
intr = 0;
posix = 0;
nocto = 0;
nolock = 1;
broken_suid = 0;
noac = 0;
retry = 10000; /* 10000 minutes ~ 1 week */
tcp = 0;
mountprog = MOUNTPROG;
mountvers = 0;
port = 0;
mountport = 0;
nfsprog = NFS_PROGRAM;
nfsvers = 0;
retry_mount:
proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;
data.flags = (soft ? NFS_MOUNT_SOFT : 0)
| (intr ? NFS_MOUNT_INTR : 0)
| (posix ? NFS_MOUNT_POSIX : 0)
| (nocto ? NFS_MOUNT_NOCTO : 0)
| (noac ? NFS_MOUNT_NOAC : 0);
#if NFS_MOUNT_VERSION >= 2
if (nfs_mount_version >= 2)
data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
#endif
#if NFS_MOUNT_VERSION >= 3
if (nfs_mount_version >= 3)
data.flags |= (nolock ? NFS_MOUNT_NONLM : 0);
#endif
#if NFS_MOUNT_VERSION >= 4
if (nfs_mount_version >= 4)
data.flags |= (broken_suid ? NFS_MOUNT_BROKEN_SUID : 0);
#endif
if (nfsvers > MAX_NFSPROT) {
log_message("NFSv%d not supported!", nfsvers);
return 0;
}
if (mountvers > MAX_NFSPROT) {
log_message("NFSv%d not supported!", nfsvers);
return 0;
}
if (nfsvers && !mountvers)
mountvers = (nfsvers < 3) ? 1 : nfsvers;
if (nfsvers && nfsvers < mountvers)
mountvers = nfsvers;
/* Adjust options if none specified */
if (!data.timeo)
data.timeo = tcp ? 70 : 7;
#ifdef NFS_MOUNT_DEBUG
log_message("rsize = %d, wsize = %d, timeo = %d, retrans = %d",
data.rsize, data.wsize, data.timeo, data.retrans);
log_message("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)",
data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
log_message("port = %d, retry = %d, flags = %.8x",
port, retry, data.flags);
log_message("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d",
mountprog, mountvers, nfsprog, nfsvers);
log_message("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d",
(data.flags & NFS_MOUNT_SOFT) != 0,
(data.flags & NFS_MOUNT_INTR) != 0,
(data.flags & NFS_MOUNT_POSIX) != 0,
(data.flags & NFS_MOUNT_NOCTO) != 0,
(data.flags & NFS_MOUNT_NOAC) != 0);
#if NFS_MOUNT_VERSION >= 2
log_message("tcp = %d",
(data.flags & NFS_MOUNT_TCP) != 0);
#endif
#endif
data.version = nfs_mount_version;
*mount_opts = (char *) &data;
/* create mount deamon client */
/* See if the nfs host = mount host. */
if (mounthost) {
if (mounthost[0] >= '0' && mounthost[0] <= '9') {
mount_server_addr.sin_family = AF_INET;
mount_server_addr.sin_addr.s_addr = inet_addr(hostname);
} else {
if (mygethostbyname(mounthost, &mount_server_addr.sin_addr)) {
log_message("nfsmount: can't get address for %s", mounthost);
goto fail;
}
}
}
/*
* The following loop implements the mount retries. On the first
* call, "running_bg" is 0. When the mount times out, and the
* "bg" option is set, the exit status EX_BG will be returned.
* For a backgrounded mount, there will be a second call by the
* child process with "running_bg" set to 1.
*
* The case where the mount point is not present and the "bg"
* option is set, is treated as a timeout. This is done to
* support nested mounts.
*
* The "retry" count specified by the user is the number of
* minutes to retry before giving up.
*
* Only the first error message will be displayed.
*/
retry_timeout.tv_sec = 3;
retry_timeout.tv_usec = 0;
total_timeout.tv_sec = 20;
total_timeout.tv_usec = 0;
timeout = time(NULL) + 60 * retry;
prevt = 0;
t = 30;
val = 1;
/* be careful not to use too many CPU cycles */
if (t - prevt < 30)
sleep(30);
pm_mnt = get_mountport(&mount_server_addr,
mountprog,
mountvers,
proto,
mountport,
nfs_mount_version);
/* contact the mount daemon via TCP */
mount_server_addr.sin_port = htons(pm_mnt->pm_port);
msock = RPC_ANYSOCK;
switch (pm_mnt->pm_prot) {
case IPPROTO_UDP:
mclient = clntudp_create(&mount_server_addr,
pm_mnt->pm_prog,
pm_mnt->pm_vers,
retry_timeout,
&msock);
if (mclient)
break;
mount_server_addr.sin_port =
htons(pm_mnt->pm_port);
msock = RPC_ANYSOCK;
case IPPROTO_TCP:
mclient = clnttcp_create(&mount_server_addr,
pm_mnt->pm_prog,
pm_mnt->pm_vers,
&msock, 0, 0);
break;
default:
mclient = 0;
}
if (mclient) {
/* try to mount hostname:dirname */
mclient->cl_auth = authunix_create_default();
/* make pointers in xdr_mountres3 NULL so
* that xdr_array allocates memory for us
*/
memset(&status, 0, sizeof(status));
log_message("nfsmount: doing client call in nfs version: %ld", pm_mnt->pm_vers);
if (pm_mnt->pm_vers == 3)
clnt_stat = clnt_call(mclient,
MOUNTPROC3_MNT,
(xdrproc_t) xdr_dirpath,
(caddr_t) &dirname,
(xdrproc_t) xdr_mountres3,
(caddr_t) &status,
total_timeout);
else
clnt_stat = clnt_call(mclient,
MOUNTPROC_MNT,
(xdrproc_t) xdr_dirpath,
(caddr_t) &dirname,
(xdrproc_t) xdr_fhstatus,
(caddr_t) &status,
total_timeout);
if (clnt_stat == RPC_SUCCESS)
goto succeeded;
if (prevt == 0)
clnt_perror(mclient, "mount");
auth_destroy(mclient->cl_auth);
clnt_destroy(mclient);
mclient = 0;
close(msock);
} else {
if (prevt == 0)
clnt_pcreateerror("mount");
}
prevt = t;
goto fail;
succeeded:
nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers;
if (nfsvers == 2) {
if (status.nfsv2.fhs_status != 0) {
log_message("nfsmount: %s:%s failed, reason given by server: %s",
hostname, dirname, nfs_strerror(status.nfsv2.fhs_status));
goto fail;
}
memcpy(data.root.data,
(char *) status.nfsv2.fhstatus_u.fhs_fhandle,
NFS_FHSIZE);
#if NFS_MOUNT_VERSION >= 4
data.root.size = NFS_FHSIZE;
memcpy(data.old_root.data,
(char *) status.nfsv2.fhstatus_u.fhs_fhandle,
NFS_FHSIZE);
#endif
} else {
#if NFS_MOUNT_VERSION >= 4
fhandle3 *fhandle;
if (status.nfsv3.fhs_status != 0) {
log_message("nfsmount: %s:%s failed, reason given by server: %s",
hostname, dirname, nfs_strerror(status.nfsv3.fhs_status));
goto fail;
}
fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle;
memset(data.old_root.data, 0, NFS_FHSIZE);
memset(&data.root, 0, sizeof(data.root));
data.root.size = fhandle->fhandle3_len;
memcpy(data.root.data,
(char *) fhandle->fhandle3_val,
fhandle->fhandle3_len);
data.flags |= NFS_MOUNT_VER3;
#endif
}
/* create nfs socket for kernel */
if (tcp) {
if (nfs_mount_version < 3) {
log_message("NFS over TCP is not supported.");
goto fail;
}
fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
} else
fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (fsock < 0) {
log_perror("nfs socket");
goto fail;
}
if (bindresvport(fsock, 0) < 0) {
log_perror("nfs bindresvport");
goto fail;
}
if (port == 0) {
server_addr.sin_port = PMAPPORT;
port = pmap_getport(&server_addr, nfsprog, nfsvers,
tcp ? IPPROTO_TCP : IPPROTO_UDP);
#if 1
/* Here we check to see if user is mounting with the
* tcp option. If so, and if the portmap returns a
* '0' for port (service unavailable), we then notify
* the user, and retry with udp.
*/
if (port == 0 && tcp == 1) {
log_message("NFS server reported TCP not available, retrying with UDP...");
tcp = 0;
goto retry_mount;
}
#endif
if (port == 0)
port = NFS_PORT;
#ifdef NFS_MOUNT_DEBUG
else
log_message("used portmapper to find NFS port");
#endif
}
#ifdef NFS_MOUNT_DEBUG
log_message("using port %d for nfs deamon", port);
#endif
server_addr.sin_port = htons(port);
/*
* connect() the socket for kernels 1.3.10 and below only,
* to avoid problems with multihomed hosts.
* --Swen
*/
if (linux_version_code() <= 66314
&& connect(fsock, (struct sockaddr *) &server_addr,
sizeof (server_addr)) < 0) {
log_perror("nfs connect");
goto fail;
}
/* prepare data structure for kernel */
data.fd = fsock;
memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr));
strncpy(data.hostname, hostname, sizeof(data.hostname));
/* clean up */
auth_destroy(mclient->cl_auth);
clnt_destroy(mclient);
close(msock);
return 0;
/* abort */
fail:
if (msock != -1) {
if (mclient) {
auth_destroy(mclient->cl_auth);
clnt_destroy(mclient);
}
close(msock);
}
if (fsock != -1)
close(fsock);
return retval;
}
/*
* We need to translate between nfs status return values and
* the local errno values which may not be the same.
*
* Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno:
* "after #include <errno.h> the symbol errno is reserved for any use,
* it cannot even be used as a struct tag or field name".
*/
#ifndef EDQUOT
#define EDQUOT ENOSPC
#endif
static struct {
enum nfsstat stat;
int errnum;
} nfs_errtbl[] = {
{ NFS_OK, 0 },
{ NFSERR_PERM, EPERM },
{ NFSERR_NOENT, ENOENT },
{ NFSERR_IO, EIO },
{ NFSERR_NXIO, ENXIO },
{ NFSERR_ACCES, EACCES },
{ NFSERR_EXIST, EEXIST },
{ NFSERR_NODEV, ENODEV },
{ NFSERR_NOTDIR, ENOTDIR },
{ NFSERR_ISDIR, EISDIR },
#ifdef NFSERR_INVAL
{ NFSERR_INVAL, EINVAL }, /* that Sun forgot */
#endif
{ NFSERR_FBIG, EFBIG },
{ NFSERR_NOSPC, ENOSPC },
{ NFSERR_ROFS, EROFS },
{ NFSERR_NAMETOOLONG, ENAMETOOLONG },
{ NFSERR_NOTEMPTY, ENOTEMPTY },
{ NFSERR_DQUOT, EDQUOT },
{ NFSERR_STALE, ESTALE },
#ifdef EWFLUSH
{ NFSERR_WFLUSH, EWFLUSH },
#endif
/* Throw in some NFSv3 values for even more fun (HP returns these) */
{ 71, EREMOTE },
{ -1, EIO }
};
static char *nfs_strerror(int stat)
{
int i;
static char buf[256];
for (i = 0; nfs_errtbl[i].stat != (unsigned)-1; i++) {
if (nfs_errtbl[i].stat == (unsigned)stat)
return strerror(nfs_errtbl[i].errnum);
}
sprintf(buf, "unknown nfs status return value: %d", stat);
return buf;
}
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