nfsmount.c

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/*
 * nfsmount.c -- Linux NFS mount
 * Copyright (C) 1993 Rick Sladkey <[e-mail]>
 *
 * 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, [e-mail] (Ross Biro): allow all port
 * numbers to be specified on the command line.
 *
 * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <[e-mail]>:
 * Omit the call to connect() for Linux version 1.3.11 or later.
 *
 * Wed Oct  1 23:55:28 1997: Dick Streefland <[e-mail]>
 * Implemented the "bg", "fg" and "retry" mount options for NFS.
 *
 * 1999-02-22 Arkadiusz Mi秌iewicz <[e-mail]>
 * - added Native Language Support
 * 
 * Modified by Olaf Kirch and Trond Myklebust for new NFS code,
 * plus NFSv3 stuff.
 */

/*
 * nfsmount.c,v 1.1.1.1 1993/11/18 08:40:51 jrs Exp
 */

#include "../defines.h"	/* for HAVE_rpcsvc_nfs_prot_h and 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 "sundries.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 "mount_constants.h"
#include "nfs_mount4.h"

#include "nls.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)

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;
	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;
#if 0
	if (!p.pm_port) {
		p.pm_port = pmap_getport(server_addr, p.pm_prog, p.pm_vers,
					 p.pm_prot);
	}
#endif
#if 0
#define MOUNTPORT 635
	/* HJLu wants to remove all traces of the old default port.
	   Are there still people running a mount RPC service on this
	   port without having a portmapper? */
	if (!p.pm_port)
		p.pm_port = MOUNTPORT;
#endif
	return &p;
}

int nfsmount(const char *spec, const char *node, int *flags,
	     char **extra_opts, char **mount_opts, int *nfs_mount_vers,
	     int running_bg)
{
	static char *prev_bg_host;
	char hostdir[1024];
	CLIENT *mclient;
	char *hostname, *dirname, *old_opts, *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 nfs_mount_version;
	int val;
	struct hostent *hp;
	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, mountport, proto, bg, soft, intr;
	int posix, nocto, noac, nolock, broken_suid;
	int retry, tcp;
	int mountprog, mountvers, nfsprog, nfsvers;
	int retval;
	time_t t;
	time_t prevt;
	time_t timeout;

	/* The version to try is either specified or 0
	   In case it is 0 we tell the caller what we tried */
	if (!*nfs_mount_vers)
		*nfs_mount_vers = find_kernel_nfs_mount_version();
	nfs_mount_version = *nfs_mount_vers;

	retval = EX_FAIL;
	msock = fsock = -1;
	mclient = NULL;
	if (strlen(spec) >= sizeof(hostdir)) {
		fprintf(stderr, _("mount: "
				  "excessively long host:dir argument\n"));
		goto fail;
	}
	strcpy(hostdir, spec);
	if ((s = strchr(hostdir, ':'))) {
		hostname = hostdir;
		dirname = s + 1;
		*s = '\0';
		/* Ignore all but first hostname in replicated mounts
		   until they can be fully supported. ([e-mail]) */
		if ((s = strchr(hostdir, ','))) {
			*s = '\0';
			fprintf(stderr,
				_("mount: warning: "
				  "multiple hostnames not supported\n"));
		}
	} else {
		fprintf(stderr,
			_("mount: "
			  "directory to mount not in host:dir format\n"));
		goto fail;
	}

	server_addr.sin_family = AF_INET;
#ifdef HAVE_inet_aton
	if (!inet_aton(hostname, &server_addr.sin_addr))
#endif
	{
		if ((hp = gethostbyname(hostname)) == NULL) {
			fprintf(stderr, _("mount: can't get address for %s\n"),
				hostname);
			goto fail;
		} else {
			if (hp->h_length > sizeof(struct in_addr)) {
				fprintf(stderr,
					_("mount: got bad hp->h_length\n"));
				hp->h_length = sizeof(struct in_addr);
			}
			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 */

	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)) {
		fprintf(stderr, _("mount: "
				  "excessively long option argument\n"));
		goto fail;
	}
	sprintf(new_opts, "%s%saddr=%s",
		old_opts, *old_opts ? "," : "", s);
	*extra_opts = xstrdup(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;
	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;

	/* 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") ||
				 !strcmp(opt, "vers"))
				nfsvers = val;
			else if (!strcmp(opt, "proto")) {
				if (!strncmp(opteq+1, "tcp", 3))
					tcp = 1;
				else if (!strncmp(opteq+1, "udp", 3))
					tcp = 0;
				else
					printf(_("Warning: Unrecognized proto= option.\n"));
			} 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 (!strcmp(opt, "broken_suid")) {
				broken_suid = val;
			} else {
				if (!sloppy) {
					printf(_("unknown nfs mount option: "
						 "%s%s\n"), val ? "" : "no", opt);
					goto fail;
				}
			}
		}
	}
	proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP;

	data.flags = (soft ? NFS_MOUNT_SOFT : 0)
		| (intr ? NFS_MOUNT_INTR : 0)
		| (posix ? NFS_MOUNT_POSIX : 0)