path: root/isys/nfsmount.c

/* MODIFIED for Red Hat Linux installer
 * msw@redhat.com
 * o always mounts without lockd
 * o uses our own host resolution
 */

/*
 * 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.
 */

/*
 * nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
 */
/* hack hack to prevent linux/in.h from being included */
#define _LINUX_IN_H


#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <time.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <arpa/inet.h>

#include "sundries.h"
#include "nfsmount.h"

#include <linux/nfs.h>
#define NFS_NEED_KERNEL_TYPES
#include "mount_constants.h"
#include "nfs_mount4.h"
#undef NFS_NEED_KERNEL_TYPES

#include "dns.h"

static char *nfs_strerror(int stat);

#define MAKE_VERSION(p,q,r)	(65536*(p) + 256*(q) + (r))

#define ERROR_CONNECT -50
#define ERROR_HOSTNAME -51

static int myerror = 0;

/* from sundries.c */
/* Fatal error.  Print message and exit.  */
void
die (int err, const char *fmt, ...) {
     va_list args;

     va_start (args, fmt);
     vfprintf (stderr, fmt, args);
     fprintf (stderr, "\n");
     va_end (args);

#if 0
     unlock_mtab ();
#endif
     exit (err);
}

char *
nfsxstrdup (const char *s) {
     char *t;

     if (s == NULL)
          return NULL;
 
     t = strdup (s);

     if (t == NULL)
          die (EX_SYSERR, "not enough memory");

     return t;
}

char *
xstrndup (const char *s, int n) {
     char *t;

     if (s == NULL)
          die (EX_SOFTWARE, "bug in xstrndup call");

     t = malloc(n+1);
     strncpy(t,s,n);
     t[n] = 0;

     return t;
}

void *
nfsxmalloc(size_t size)
{
      void *ptr = malloc(size);
        if (!ptr)
	    {
		      error("Out of memory");
		            exit(1);
	    }
	  return ptr;
}

/* end of sundries.c */

#ifdef HAVE_NFSV3
#define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2)
#else
#define MAX_NFSPROT 2
#endif

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;
}

/*
 * nfs_mount_version according to the kernel sources seen at compile time.
 */
static int nfs_mount_version = KERNEL_NFS_MOUNT_VERSION;

/*
 * 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:
 *	KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time
 *	NFS_MOUNT_VERSION: these nfsmount sources at compile time
 *	nfs_mount_version: version this source and running kernel can handle
 */
static void
find_kernel_nfs_mount_version(void) {
	int kernel_version = linux_version_code();

	if (kernel_version) {
	     if (kernel_version < MAKE_VERSION(2,1,32))
		  nfs_mount_version = 1;
#ifdef HAVE_NFSV3
	     else if (kernel_version < MAKE_VERSION(2,2,7))
		  nfs_mount_version = 3;
	     else
		  nfs_mount_version = 4;
#else
	     else
		 nfs_mount_version = 3;
#endif
	}
#if 0
	if (nfs_mount_version > NFS_MOUNT_VERSION)
	     nfs_mount_version = NFS_MOUNT_VERSION;
#endif
}

static struct pmap *
get_mountport(struct sockaddr_in *server_addr,
      long unsigned prog,
      long unsigned version,
      long unsigned proto,
      long unsigned port)
{
struct pmaplist *pmap;
static struct pmap p = {0, 0, 0, 0};

server_addr->sin_port = PMAPPORT;
pmap = pmap_getmaps(server_addr);

if (!pmap)
	return NULL;

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;

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(const char *spec, const char *node, int *flags,
	     char **extra_opts, char **mount_opts, int running_bg)
{
	static char *prev_bg_host;
	char hostdir[1024];
	CLIENT *mclient;
	char *hostname;
	char *dirname;
	char *old_opts;
	char *mounthost=NULL;
	char new_opts[1024];
	struct timeval total_timeout;
	enum clnt_stat clnt_stat;
	static struct nfs_mount_data data;
	char *opt, *opteq;
	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;
	struct stat statbuf;
	char *s;
	int port;
	int mountport;
	int proto;
	int bg;
	int soft;
	int intr;
	int posix;
	int nocto;
	int noac;
	int nolock;
	int retry;
	int tcp;
	int mountprog;
	int mountvers;
	int nfsprog;
	int nfsvers;
	int retval;
	time_t t;
	time_t prevt;
	time_t timeout;

	find_kernel_nfs_mount_version();
	
	myerror = 0;
	retval = EX_FAIL;
	msock = fsock = -1;
	mclient = NULL;
	if (strlen(spec) >= sizeof(hostdir)) {
		goto fail;
	}
	strcpy(hostdir, spec);
	if ((s = (strchr(hostdir, ':')))) {
		hostname = hostdir;
		dirname = s + 1;
		*s = '\0';
	} else {
		goto fail;
	}

	server_addr.sin_family = AF_INET;
#if 1		/* old libc's do not have inet_aton() -- change 1 to 0 */
	if (!inet_aton(hostname, &server_addr.sin_addr))
#endif
	{
		if (mygethostbyname(hostname, &server_addr.sin_addr)) {
			myerror = ERROR_HOSTNAME;
			goto fail;
		} else {
			server_addr.sin_family = AF_INET;
		}
	}

	memcpy (&mount_server_addr, &server_addr, sizeof (mount_server_addr));

	/* add IP address to mtab options for use when unmounting */

	s = inet_ntoa(server_addr.sin_addr);
	old_opts = *extra_opts;
	if (!old_opts)
		old_opts = "";
	if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
		goto fail;
	}
	sprintf(new_opts, "%s%saddr=%s",
		old_opts, *old_opts ? "," : "", s);
	*extra_opts = nfsxstrdup(new_opts);

	/* 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

	bg = 0;
	soft = 0;
	intr = 0;
	posix = 0;
	nocto = 0;
	nolock = 0;
	noac = 0;
	retry = 10000;		/* 10000 minutes ~ 1 week */
	tcp = 0;

	mountprog = MOUNTPROG;
	mountvers = 0;
	port = 0;
	mountport = 0;
	nfsprog = NFS_PROGRAM;
	nfsvers = 0;

	/* 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=xstrndup(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
				if (nfs_mount_version >= 2)
					data.namlen = val;
				else
#endif
				printf("Warning: Option namlen is not supported.\n");
			}
			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 if (!strcmp(opt, "lock")) {
				if (nfs_mount_version >= 3)
					nolock = !val;
				else
					printf("Warning: option nolock is not supported.\n");
			} else {
#if 0
				if (!sloppy) {
#endif
					printf("unknown nfs mount option: "
					       "%s%s\n", val ? "" : "no", opt);
					goto fail;
#if 0
				}
#endif
			}
		}
	}
	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 |= NFS_MOUNT_NONLM; /* HACK HACK msw */
#endif

	/* Adjust options if none specified */
	if (!data.timeo)
		data.timeo = tcp ? 70 : 7;

#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
#endif
	if (nfsvers > MAX_NFSPROT) {
		fprintf(stderr, "NFSv%d not supported!\n", nfsvers);
		return 0;
	}
	if (mountvers > MAX_NFSPROT) {
		fprintf(stderr, "NFSv%d not supported!\n", nfsvers);
		return 0;
	}
	if (nfsvers && !mountvers)
		mountvers = (nfsvers < 3) ? 1 : nfsvers;
	if (nfsvers && nfsvers < mountvers) {
		mountvers = nfsvers;
	}

	data.version = nfs_mount_version;
	*mount_opts = (char *) &data;

	if (*flags & MS_REMOUNT)
		return 0;

	/*
	 * If the previous mount operation on the same host was
	 * backgrounded, and the "bg" for this mount is also set,
	 * give up immediately, to avoid the initial timeout.
	 */
	if (bg && !running_bg &&
	    prev_bg_host && strcmp(hostname, prev_bg_host) == 0) {
		if (retry > 0)
			retval = EX_BG;
		return retval;
	}

	/* 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(hostname, &mount_server_addr.sin_addr)) {
			  myerror = ERROR_HOSTNAME;
			  goto fail;
		  } else {
			mount_server_addr.sin_family = AF_INET;
		  }
	  }
	}

	/*
	 * 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;
	for (;;) {
		if (bg && stat(node, &statbuf) == -1) {
			if (running_bg) {
				sleep(val);	/* 1, 2, 4, 8, 16, 30, ... */
				val *= 2;
				if (val > 30)
					val = 30;
			}
		} else {
			/* 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);

			if (pm_mnt == NULL) {
			  fprintf(stderr, "mount: cannot access portmapper on %s: %s\n",
				  hostname, strerror (errno));
			  goto fail;
			}

			/* 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));

			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)
					break;		/* we're done */
				if (errno != ECONNREFUSED) {
					clnt_perror(mclient, "mount");
					goto fail;	/* don't retry */
				}
				if (!running_bg && prevt == 0)
					clnt_perror(mclient, "mount");
				auth_destroy(mclient->cl_auth);
				clnt_destroy(mclient);
				mclient = 0;
				close(msock);
			} else {
				if (!running_bg && prevt == 0)
					clnt_pcreateerror("mount");
			}
			prevt = t;
		}
		if (!bg) {
		        myerror = ERROR_CONNECT;
		        goto fail;
		}
		if (!running_bg) {
			prev_bg_host = nfsxstrdup(hostname);
			if (retry > 0)
				retval = EX_BG;
			goto fail;
		}
		t = time(NULL);
		if (t >= timeout)
			goto fail;
	}

	nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers;
  
	if (nfsvers == 2) {
		if (status.nfsv2.fhs_status != 0) {
			myerror = 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) {
			myerror = 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) {
	     		printf("NFS over TCP is not supported.\n");
			goto fail;
		}
		fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	} 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);
	 /*
	  * 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) {
		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 nfs_stat 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		},
};

char *nfs_error(void)
{
    static char * host = "Unable to resolve hostname";
    static char * connect = "Unable to connect to server";
    
    if (myerror == 0)
	return strerror(0);
    if (myerror == ERROR_CONNECT)
	return connect;
    if (myerror == ERROR_HOSTNAME)
	return host;
    return nfs_strerror(myerror);
}

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].errnum);
	}
	sprintf(buf, "unknown nfs status return value: %d", stat);
	return buf;
}

#if 0
int
my_getport(struct in_addr server, struct timeval *timeo, ...)
{
        struct sockaddr_in sin;
        struct pmap     pmap;
        CLIENT          *clnt;
        int             sock = RPC_ANYSOCK, port;

        pmap.pm_prog = prog;
        pmap.pm_vers = vers;
        pmap.pm_prot = prot;
        pmap.pm_port = 0;
        sin.sin_family = AF_INET;
        sin.sin_addr = server;
        sin.sin_port = htons(111);
        clnt = clntudp_create(&sin, 100000, 2, *timeo, &sock);
        status = clnt_call(clnt, PMAP_GETPORT,
                                &pmap, (xdrproc_t) xdr_pmap,
                                &port, (xdrproc_t) xdr_uint);
        if (status != SUCCESS) {
	     /* natter */
                port = 0;
        }

        clnt_destroy(clnt);
        close(sock);
        return port;
}
#endif