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util-linux/mount/nfsmount.c

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/*
* 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.
*/
/*
* nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
*/
#include <stdio.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <string.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <errno.h>
#include "sundries.h"
#include "mount.h"
#include <linux/fs.h>
#include <linux/nfs.h>
#include <linux/nfs_mount.h>
static char *strndup (char *str, int n) {
char *ret;
ret = malloc (n+1);
if (ret == NULL) {
perror ("malloc");
return (NULL);
}
strncpy (ret, str, n);
return (ret);
}
static char *nfs_strerror(int stat);
int nfsmount(const char *spec, const char *node, int *flags,
char **extra_opts, char **mount_opts)
{
char hostdir[1024];
CLIENT *mclient;
char *hostname;
char *dirname;
char *old_opts;
char *mounthost=NULL;
char new_opts[1024];
fhandle root_fhandle;
struct timeval total_timeout;
enum clnt_stat clnt_stat;
static struct nfs_mount_data data;
char *opt, *opteq;
int val;
struct hostent *hp;
struct sockaddr_in server_addr;
struct sockaddr_in mount_server_addr;
int msock, fsock;
struct timeval pertry_timeout;
struct fhstatus status;
char *s;
int port;
int mountport;
int bg;
int soft;
int intr;
int posix;
int nocto;
int noac;
int retry;
int tcp;
int mountprog;
int mountvers;
int nfsprog;
int nfsvers;
msock = fsock = -1;
mclient = NULL;
strcpy(hostdir, spec);
if ((s = (strchr(hostdir, ':')))) {
hostname = hostdir;
dirname = s + 1;
*s = '\0';
}
else {
fprintf(stderr, "mount: "
"directory to mount not in host:dir format\n");
goto fail;
}
if (hostname[0] >= '0' && hostname[0] <= '9') {
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr(hostname);
}
else if ((hp = gethostbyname(hostname)) == NULL) {
fprintf(stderr, "mount: can't get address for %s\n", hostname);
goto fail;
}
else {
server_addr.sin_family = AF_INET;
memcpy(&server_addr.sin_addr, hp->h_addr, hp->h_length);
}
memcpy (&mount_server_addr, &server_addr, sizeof (mount_server_addr));
/* add IP address to mtab options for use when unmounting */
old_opts = *extra_opts;
if (!old_opts)
old_opts = "";
sprintf(new_opts, "%s%saddr=%s",
old_opts, *old_opts ? "," : "",
inet_ntoa(server_addr.sin_addr));
*extra_opts = strdup(new_opts);
/* set default options */
data.rsize = 0; /* let kernel decide */
data.wsize = 0; /* let kernel decide */
data.timeo = 7;
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
bg = 0;
soft = 0;
intr = 0;
posix = 0;
nocto = 0;
noac = 0;
retry = 10000;
tcp = 0;
mountprog = MOUNTPROG;
mountvers = MOUNTVERS;
port = 0;
mountport = 0;
nfsprog = NFS_PROGRAM;
nfsvers = NFS_VERSION;
/* parse options */
for (opt = strtok(old_opts, ","); opt; opt = strtok(NULL, ",")) {
if ((opteq = strchr(opt, '='))) {
val = atoi(opteq + 1);
*opteq = '\0';
if (!strcmp(opt, "rsize"))
data.rsize = val;
else if (!strcmp(opt, "wsize"))
data.wsize = val;
else if (!strcmp(opt, "timeo"))
data.timeo = val;
else if (!strcmp(opt, "retrans"))
data.retrans = val;
else if (!strcmp(opt, "acregmin"))
data.acregmin = val;
else if (!strcmp(opt, "acregmax"))
data.acregmax = val;
else if (!strcmp(opt, "acdirmin"))
data.acdirmin = val;
else if (!strcmp(opt, "acdirmax"))
data.acdirmax = val;
else if (!strcmp(opt, "actimeo")) {
data.acregmin = val;
data.acregmax = val;
data.acdirmin = val;
data.acdirmax = val;
}
else if (!strcmp(opt, "retry"))
retry = val;
else if (!strcmp(opt, "port"))
port = val;
else if (!strcmp(opt, "mountport"))
mountport = val;
else if (!strcmp(opt, "mounthost"))
mounthost=strndup(opteq+1,
strcspn(opteq+1," \t\n\r,"));
else if (!strcmp(opt, "mountprog"))
mountprog = val;
else if (!strcmp(opt, "mountvers"))
mountvers = val;
else if (!strcmp(opt, "nfsprog"))
nfsprog = val;
else if (!strcmp(opt, "nfsvers"))
nfsvers = val;
else if (!strcmp(opt, "namlen")) {
#if NFS_MOUNT_VERSION >= 2
data.namlen = val;
#else
printf("Warning: Option namlen is not supported.\n");
#endif
}
else if (!strcmp(opt, "addr"))
/* ignore */;
else {
printf("unknown nfs mount parameter: "
"%s=%d\n", opt, val);
goto fail;
}
}
else {
val = 1;
if (!strncmp(opt, "no", 2)) {
val = 0;
opt += 2;
}
if (!strcmp(opt, "bg"))
bg = val;
else if (!strcmp(opt, "fg"))
bg = !val;
else if (!strcmp(opt, "soft"))
soft = val;
else if (!strcmp(opt, "hard"))
soft = !val;
else if (!strcmp(opt, "intr"))
intr = val;
else if (!strcmp(opt, "posix"))
posix = val;
else if (!strcmp(opt, "cto"))
nocto = !val;
else if (!strcmp(opt, "ac"))
noac = !val;
else if (!strcmp(opt, "tcp"))
tcp = val;
else if (!strcmp(opt, "udp"))
tcp = !val;
else {
printf("unknown nfs mount option: "
"%s%s\n", val ? "" : "no", opt);
goto fail;
}
}
}
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
data.flags |= (tcp ? NFS_MOUNT_TCP : 0);
#endif
#ifdef NFS_MOUNT_DEBUG
printf("rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
data.rsize, data.wsize, data.timeo, data.retrans);
printf("acreg (min, max) = (%d, %d), acdir (min, max) = (%d, %d)\n",
data.acregmin, data.acregmax, data.acdirmin, data.acdirmax);
printf("port = %d, bg = %d, retry = %d, flags = %.8x\n",
port, bg, retry, data.flags);
printf("mountprog = %d, mountvers = %d, nfsprog = %d, nfsvers = %d\n",
mountprog, mountvers, nfsprog, nfsvers);
printf("soft = %d, intr = %d, posix = %d, nocto = %d, noac = %d\n",
(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
printf("tcp = %d\n",
(data.flags & NFS_MOUNT_TCP) != 0);
#endif
#if 0
goto fail;
#endif
#endif
data.version = NFS_MOUNT_VERSION;
*mount_opts = (char *) &data;
if (*flags & MS_REMOUNT)
return 0;
/* 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 ((hp = gethostbyname(mounthost)) == NULL) {
fprintf(stderr, "mount: can't get address for %s\n", hostname);
goto fail;
}
else {
mount_server_addr.sin_family = AF_INET;
memcpy(&mount_server_addr.sin_addr, hp->h_addr, hp->h_length);
}
}
mount_server_addr.sin_port = htons(mountport);
msock = RPC_ANYSOCK;
if ((mclient = clnttcp_create(&mount_server_addr,
mountprog, mountvers, &msock, 0, 0)) == NULL) {
mount_server_addr.sin_port = htons(mountport);
msock = RPC_ANYSOCK;
pertry_timeout.tv_sec = 3;
pertry_timeout.tv_usec = 0;
if ((mclient = clntudp_create(&mount_server_addr,
mountprog, mountvers, pertry_timeout, &msock)) == NULL) {
clnt_pcreateerror("mount clntudp_create");
goto fail;
}
#ifdef NFS_MOUNT_DEBUG
printf("using UDP for mount deamon\n");
#endif
}
#ifdef NFS_MOUNT_DEBUG
else
printf("using TCP for mount deamon\n");
#endif
mclient->cl_auth = authunix_create_default();
total_timeout.tv_sec = 20;
total_timeout.tv_usec = 0;
/* try to mount hostname:dirname */
clnt_stat = clnt_call(mclient, MOUNTPROC_MNT,
xdr_dirpath, &dirname,
xdr_fhstatus, &status,
total_timeout);
if (clnt_stat != RPC_SUCCESS) {
clnt_perror(mclient, "rpc mount");
goto fail;
}
if (status.fhs_status != 0) {
fprintf(stderr,
"mount: %s:%s failed, reason given by server: %s\n",
hostname, dirname, nfs_strerror(status.fhs_status));
goto fail;
}
memcpy((char *) &root_fhandle, (char *) status.fhstatus_u.fhs_fhandle,
sizeof (root_fhandle));
/* create nfs socket for kernel */
if (tcp) {
#if NFS_MOUNT_VERSION >= 2
fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
#else
printf("NFS over TCP is not supported.\n");
goto fail;
#endif
}
else
fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (fsock < 0) {
perror("nfs socket");
goto fail;
}
if (bindresvport(fsock, 0) < 0) {
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 (port == 0)
port = NFS_PORT;
#ifdef NFS_MOUNT_DEBUG
else
printf("used portmapper to find NFS port\n");
#endif
}
#ifdef NFS_MOUNT_DEBUG
printf("using port %d for nfs deamon\n", port);
#endif
server_addr.sin_port = htons(port);
if (connect(fsock, (struct sockaddr *) &server_addr,
sizeof (server_addr)) < 0) {
perror("nfs connect");
goto fail;
}
/* prepare data structure for kernel */
data.fd = fsock;
memcpy((char *) &data.root, (char *) &root_fhandle,
sizeof (root_fhandle));
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) {
auth_destroy(mclient->cl_auth);
clnt_destroy(mclient);
close(msock);
}
if (fsock != -1)
close(fsock);
return 1;}
/*
* We need to translate between nfs status return values and
* the local errno values which may not be the same.
*/
#ifndef EDQUOT
#define EDQUOT ENOSPC
#endif
static struct {
enum nfs_stat stat;
int errno;
} 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
{ -1, EIO }
};
static char *nfs_strerror(int stat)
{
int i;
static char buf[256];
for (i = 0; nfs_errtbl[i].stat != -1; i++) {
if (nfs_errtbl[i].stat == stat)
return strerror(nfs_errtbl[i].errno);
}
sprintf(buf, "unknown nfs status return value: %d", stat);
return buf;
}
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