X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fnfsumount.c;h=b846564a331e41da2c178f2cf280b84eded197ab;hp=f6294d4e5c83fcd96a09c057a41d163f33e4fc06;hb=12544486ef2de86e4f2dfc920cd2860fb81658d1;hpb=e8c2f652125bf15f7e3c8ee3c05cd2b1b7b6af14

diff --git a/utils/mount/nfsumount.c b/utils/mount/nfsumount.c
index f6294d4..b846564 100644
--- a/utils/mount/nfsumount.c
+++ b/utils/mount/nfsumount.c
@@ -17,21 +17,30 @@
  *
  */
 
+#include <unistd.h>
 #include <stdio.h>
 #include <errno.h>
 #include <getopt.h>
 #include <mntent.h>
 #include <sys/mount.h>
 #include <ctype.h>
+#include <pwd.h>
 
 #include "xcommon.h"
 #include "fstab.h"
 #include "nls.h"
-#include "conn.h"
 
 #include "mount_constants.h"
+#include "nfs_mount.h"
 #include "mount.h"
-#include "nfsumount.h"
+#include "error.h"
+#include "network.h"
+#include "parse_opt.h"
+#include "parse_dev.h"
+#include "utils.h"
+
+#define MOUNTSFILE	"/proc/mounts"
+#define LINELEN		(4096)
 
 #if !defined(MNT_FORCE)
 /* dare not try to include <linux/mount.h> -- lots of errors */
@@ -43,262 +52,163 @@
 #endif
 
 extern char *progname;
-extern int nfs_mount_version;
 extern int nomtab;
 extern int verbose;
 int force;
 int lazy;
 int remount;
 
-extern int find_kernel_nfs_mount_version(void);
-extern int probe_mntport(clnt_addr_t *);
-extern int nfs_gethostbyname(const char *, struct sockaddr_in *);
 
-static inline enum clnt_stat
-nfs_umount(dirpath *argp, CLIENT *clnt)
+static int try_remount(const char *spec, const char *node)
 {
-	return clnt_call(clnt, MOUNTPROC_UMNT,
-			 (xdrproc_t) xdr_dirpath, (caddr_t)argp,
-			 (xdrproc_t) xdr_void, NULL,
-			 TIMEOUT);
-}
-
-int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
-{
-	CLIENT *clnt;
-	enum clnt_stat res = 0;
-	int msock;
-
-	switch (mnt_server->pmap.pm_vers) {
-	case 3:
-	case 2:
-	case 1:
-		if (!probe_mntport(mnt_server))
-			goto out_bad;
-		clnt = mnt_openclnt(mnt_server, &msock);
-		if (!clnt)
-			goto out_bad;
-		res = nfs_umount(argp, clnt);
-		mnt_closeclnt(clnt, msock);
-		if (res == RPC_SUCCESS)
-			return 1;
-		break;
-	default:
-		res = 1;
-		break;
+	int res;
+
+	res = mount(spec, node, NULL,
+		    MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
+	if (res == 0) {
+		struct mntent remnt;
+		nfs_error(_("%s: %s busy - remounted read-only"),
+				progname, spec);
+		remnt.mnt_type = remnt.mnt_fsname = NULL;
+		remnt.mnt_dir = xstrdup(node);
+		remnt.mnt_opts = xstrdup("ro");
+		if (!nomtab)
+			update_mtab(node, &remnt);
+	} else if (errno != EBUSY) {    /* hmm ... */
+		perror(_("remount"));
+		nfs_error(_("%s: could not remount %s read-only"),
+				progname, spec);
 	}
- out_bad:
 	return res;
 }
 
-struct mntentchn *
-getmntentchn(const char *dir)
+static int del_mtab(const char *spec, const char *node)
 {
-	mntFILE *mfp;
-	nfs_mntent_t *mnt;
-	struct mntentchn *mc = NULL;
-
-	mfp = nfs_setmntent ("/proc/mounts", "r");
-	if (mfp == NULL || mfp->mntent_fp == NULL)
-		return NULL;
-
-	while ((mnt = nfs_getmntent(mfp)) != NULL) {
-		if(strcmp(mnt->mnt_fsname, dir) && strcmp(mnt->mnt_dir, dir))
-			continue;
+	int umnt_err, res;
+
+	umnt_err = 0;
+	if (lazy) {
+		res = umount2 (node, MNT_DETACH);
+		if (res < 0)
+			umnt_err = errno;
+		goto writemtab;
+	}
 
-		if (!mc)
-			mc = (struct mntentchn *)xmalloc(sizeof(*mc));
-		mc->m = *mnt;
+	if (force) {
+		res = umount2 (node, MNT_FORCE);
+		if (res == -1) {
+			int errsv = errno;
+			perror(_("umount2"));
+			errno = errsv;
+			if (errno == ENOSYS) {
+				if (verbose)
+					printf(_("no umount2, trying umount...\n"));
+				res = umount (node);
+			}
+		}
+	} else
+		res = umount (node);
+
+	if (res < 0) {
+		if (remount && errno == EBUSY && spec) {
+			res = try_remount(spec, node);
+			if (res)
+				goto writemtab;
+			return EX_SUCCESS;
+		} else
+			umnt_err = errno;
 	}
 
-	nfs_endmntent(mfp);
-	return mc;
-}
+	if (res >= 0) {
+		/* Umount succeeded */
+		if (verbose)
+			printf(_("%s umounted\n"), spec ? spec : node);
+	}
 
-/* complain about a failed umount */
-static void complain(int err, const char *dev) {
-  switch (err) {
-    case ENXIO:
-      nfs_error (_("umount: %s: invalid block device"), dev); break;
-    case EINVAL:
-      nfs_error (_("umount: %s: not mounted"), dev); break;
-    case EIO:
-      nfs_error (_("umount: %s: can't write superblock"), dev); break;
-    case EBUSY:
-     /* Let us hope fstab has a line "proc /proc ..."
-        and not "none /proc ..."*/
-      nfs_error (_("umount: %s: device is busy"), dev); break;
-    case ENOENT:
-      nfs_error (_("umount: %s: not found"), dev); break;
-    case EPERM:
-      nfs_error (_("umount: %s: must be superuser to umount"), dev); break;
-    case EACCES:
-      nfs_error (_("umount: %s: block devices not permitted on fs"), dev); break;
-    default:
-      nfs_error (_("umount: %s: %s"), dev, strerror (err)); break;
-  }
-}
+ writemtab:
+	if (!nomtab &&
+	    (umnt_err == 0 || umnt_err == EINVAL || umnt_err == ENOENT)) {
+		update_mtab(node, NULL);
+	}
 
-int del_mtab(const char *spec, const char *node, const char *type,
-		const char *opts, struct mntentchn *mc)
-{
-	int umnt_err, umnt_err2, res;
-
-        umnt_err = umnt_err2 = 0;
-        if (lazy) {
-                res = umount2 (node, MNT_DETACH);
-                if (res < 0)
-                        umnt_err = errno;
-                goto writemtab;
-        }
-
-        if (force) {
-                res = umount2 (node, MNT_FORCE);
-                if (res == -1) {
-                        int errsv = errno;
-                        perror("umount2");
-                        errno = errsv;
-                        if (errno == ENOSYS) {
-                                if (verbose)
-                                        printf(_("no umount2, trying umount...\n"));
-                                res = umount (node);
-                        }
-                }
-        } else
-                res = umount (node);
-
-        if (res < 0) {
-                umnt_err = errno;
-                /* A device might have been mounted on a node that has since
-                   been deleted or renamed, so if node fails, also try spec. */
-                /* Note that this is incorrect in case spec was mounted
-                   several times. */
-                /* if (umnt_err == ENOENT || umnt_err == EINVAL) */
-                if (umnt_err != EBUSY && strcmp(node, spec)) {
-                        if (verbose)
-                                printf (_("could not umount %s - trying %s instead\n"),
-                                        node, spec);
-                        res = umount (spec);
-                        if (res < 0)
-                                umnt_err2 = errno;
-                       /* Do not complain about remote NFS mount points */
-                        if (errno == ENOENT && index(spec, ':'))
-                                umnt_err2 = 0;
-                }
-        }
-
-        if (res < 0 && remount && (umnt_err == EBUSY || umnt_err2 == EBUSY)) {
-                /* Umount failed - let us try a remount */
-                res = mount(spec, node, NULL,
-                            MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
-                if (res == 0) {
-                        nfs_mntent_t remnt;
-                        fprintf(stderr,
-                                _("umount: %s busy - remounted read-only\n"),
-                                spec);
-                        remnt.mnt_type = remnt.mnt_fsname = NULL;
-                        remnt.mnt_dir = xstrdup(node);
-                        remnt.mnt_opts = xstrdup("ro");
-                        if (!nomtab)
-                                update_mtab(node, &remnt);
-                        return 0;
-                } else if (errno != EBUSY) {    /* hmm ... */
-                        perror("remount");
-                        fprintf(stderr,
-                                _("umount: could not remount %s read-only\n"),
-                                spec);
-                }
-        }
-
-        if (res >= 0) {
-                /* Umount succeeded */
-                if (verbose)
-                        printf (_("%s umounted\n"), spec);
-        }
+	if (res >= 0)
+		return EX_SUCCESS;
 
- writemtab:
-        if (!nomtab &&
-            (umnt_err == 0 || umnt_err == EINVAL || umnt_err == ENOENT)) {
-               update_mtab (node, NULL);
-        }
-
-        if (res >= 0)
-                return 0;
-
-        if (umnt_err2)
-                complain(umnt_err2, spec);
-        if (umnt_err && umnt_err != umnt_err2)
-                complain(umnt_err, node);
-        return 1;
+	if (umnt_err)
+		umount_error(umnt_err, node);
+	return EX_FILEIO;
 }
 
 /*
- * Returns 1 if everything went well, else 0.
+ * Detect NFSv4 mounts.
+ *
+ * Consult /proc/mounts to determine if the mount point
+ * is an NFSv4 mount.  The kernel is authoritative about
+ * what type of mount this is.
+ *
+ * Returns 1 if "mc" is an NFSv4 mount, zero if not, and
+ * -1 if some error occurred.
  */
-int _nfsumount(const char *spec, const char *opts)
+static int nfs_umount_is_vers4(const struct mntentchn *mc)
 {
-	char *hostname;
-	char *dirname;
-	clnt_addr_t mnt_server = { &hostname, };
-	struct mntent mnt = { .mnt_opts = opts };
-	struct pmap *pmap = &mnt_server.pmap;
-	char *p;
-
-	nfs_mount_version = find_kernel_nfs_mount_version();
-	if (spec == NULL || (p = strchr(spec,':')) == NULL)
-		goto out_bad;
-	hostname = xstrndup(spec, p-spec);
-	dirname = xstrdup(p+1);
-#ifdef NFS_MOUNT_DEBUG
-	printf(_("host: %s, directory: %s\n"), hostname, dirname);
-#endif
+	struct mntentchn *pmc;
+	struct mount_options *options;
+	int retval;
+
+	retval = -1;
+	pmc = getprocmntdirbackward(mc->m.mnt_dir, NULL);
+	if (!pmc)
+		goto not_found;
+
+	do {
+		int nlen = strlen(pmc->m.mnt_fsname);
+		/*
+		 * It's possible the mount location string in /proc/mounts
+		 * ends with a '/'. In this case, if the entry came from
+		 * /etc/mtab, it won't have the trailing '/' so deal with
+		 * it.
+		 */
+		while (pmc->m.mnt_fsname[nlen - 1] == '/')
+			nlen--;
+		if (strncmp(pmc->m.mnt_fsname, mc->m.mnt_fsname, nlen) != 0)
+			continue;
 
-	if (opts && (p = strstr(opts, "addr="))) {
-		char *q;
+		if (strcmp(pmc->m.mnt_type, "nfs4") == 0)
+			goto out_nfs4;
 
-		free(hostname);
-		p += 5;
-		q = p;
-		while (*q && *q != ',') q++;
-		hostname = xstrndup(p,q-p);
-	}
+		options = po_split(pmc->m.mnt_opts);
+		if (options != NULL) {
+			unsigned long version;
+			int rc = nfs_nfs_version(options, &version);
+			po_destroy(options);
+			if (rc && version == 4)
+				goto out_nfs4;
+		}
 
-	if (opts && (p = strstr(opts, "mounthost="))) {
-		char *q;
+		if (strcmp(pmc->m.mnt_type, "nfs") == 0)
+			goto out_nfs;
+	} while ((pmc = getprocmntdirbackward(mc->m.mnt_dir, pmc)) != NULL);
 
-		free(hostname);
-		p += 10;
-		q = p;
-		while (*q && *q != ',') q++;
-		hostname = xstrndup(p,q-p);
+	if (retval == -1) {
+not_found:
+		fprintf(stderr, "%s was not found in %s\n",
+			mc->m.mnt_dir, MOUNTSFILE);
+		goto out;
 	}
 
-	pmap->pm_prog = MOUNTPROG;
-	pmap->pm_vers = MOUNTVERS_NFSV3;
-	pmap->pm_prot = IPPROTO_TCP;
-	if (opts && (p = strstr(opts, "mountprog=")) && isdigit(*(p+10)))
-		pmap->pm_prog = atoi(p+10);
-	if (opts && (p = strstr(opts, "mountport=")) && isdigit(*(p+10)))
-		pmap->pm_port = atoi(p+10);
-	if (opts && hasmntopt(&mnt, "v2"))
-		pmap->pm_vers = nfsvers_to_mnt(2);
-	if (opts && hasmntopt(&mnt, "v3"))
-		pmap->pm_vers = nfsvers_to_mnt(3);
-	if (opts && hasmntopt(&mnt, "v4"))
-		pmap->pm_vers = nfsvers_to_mnt(4);
-	if (opts && (p = strstr(opts, "vers=")) && isdigit(*(p+5)))
-		pmap->pm_vers = nfsvers_to_mnt(atoi(p+5));
-	if (opts && (p = strstr(opts, "mountvers=")) && isdigit(*(p+10)))
-		pmap->pm_vers = atoi(p+10);
-	if (opts && (hasmntopt(&mnt, "udp") || hasmntopt(&mnt, "proto=udp")))
-		pmap->pm_prot = IPPROTO_UDP;
-
-	if (!nfs_gethostbyname(hostname, &mnt_server.saddr))
-		goto out_bad;
-	return nfs_call_umount(&mnt_server, &dirname);
- out_bad:
-	printf("%s: %s: not found or not mounted\n", progname, spec);
-	return 0;
+out_nfs4:
+	if (verbose)
+		fprintf(stderr, "NFSv4 mount point detected\n");
+	retval = 1;
+	goto out;
+
+out_nfs:
+	if (verbose)
+		fprintf(stderr, "Legacy NFS mount point detected\n");
+	retval = 0;
+
+out:
+	return retval;
 }
 
 static struct option umount_longopts[] =
@@ -311,28 +221,23 @@ static struct option umount_longopts[] =
   { NULL, 0, 0, 0 }
 };
 
-void umount_usage()
-{
-	printf("usage: %s dir [-fvnrlh]\n", progname);
-	printf("options:\n\t-f\t\tforce unmount\n");
-	printf("\t-v\t\tverbose\n");
-	printf("\t-n\t\tDo not update /etc/mtab\n");
-	printf("\t-r\t\tremount\n");
-	printf("\t-l\t\tlazy unmount\n");
-	printf("\t-h\t\tprint this help\n\n");
-}
-
 int nfsumount(int argc, char *argv[])
 {
 	int c, ret;
 	char *spec;
 	struct mntentchn *mc;
 
+	if (argc < 2) {
+		umount_usage();
+		return EX_USAGE;
+	}
+
 	spec = argv[1];
 
 	argv += 1;
 	argc -= 1;
 
+	argv[0] = argv[-1]; /* So that getopt error messages are correct */
 	while ((c = getopt_long (argc, argv, "fvnrlh",
 				umount_longopts, NULL)) != -1) {
 
@@ -355,35 +260,91 @@ int nfsumount(int argc, char *argv[])
 		case 'h':
 		default:
 			umount_usage();
-			return 0;
+			return EX_USAGE;
 		}
 	}
+	if (optind != argc) {
+		umount_usage();
+		return EX_USAGE;
+	}
 	
 	if (spec == NULL || (*spec != '/' && strchr(spec,':') == NULL)) {
-		printf(_("umount: %s: not found\n"), spec);
-		return 0;
+		nfs_error(_("%s: %s: not found\n"), progname, spec);
+		return EX_USAGE;
 	}
 
-	mc = getmntentchn(spec);
-	if (!mc)
+	if (*spec == '/')
 		mc = getmntdirbackward(spec, NULL);
-	if (!mc)
+	else
 		mc = getmntdevbackward(spec, NULL);
 	if (!mc && verbose)
 		printf(_("Could not find %s in mtab\n"), spec);
 
-	if(mc) {
-		ret = _nfsumount(mc->m.mnt_fsname, mc->m.mnt_opts);
-		if(ret)
-			ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir,
-				mc->m.mnt_type, mc->m.mnt_opts, mc);
+	if (mc && strcmp(mc->m.mnt_type, "nfs") != 0 &&
+	    strcmp(mc->m.mnt_type, "nfs4") != 0) {
+		nfs_error(_("%s: %s on %s is not an NFS filesystem"),
+				progname, mc->m.mnt_fsname, mc->m.mnt_dir);
+		return EX_USAGE;
 	}
-	else {
-		ret = _nfsumount(spec, NULL);
-		if(ret)
-			ret = del_mtab(spec, spec, spec, spec, NULL);
+
+	if (getuid() != 0) {
+		/* only permitted if "user=" or "users" is in mount options */
+		if (!mc) {
+			/* umount might call us twice.  The second time there will
+			 * be no entry in mtab and we should just exit quietly
+			 */
+			return EX_SUCCESS;
+
+		only_root:
+			nfs_error(_("%s: You are not permitted to unmount %s"),
+					progname, spec);
+			return EX_USAGE;
+		}
+		if (hasmntopt(&mc->m, "users") == NULL) {
+			char *opt = hasmntopt(&mc->m, "user");
+			struct passwd *pw;
+			char *comma;
+			size_t len;
+			if (!opt)
+				goto only_root;
+			if (opt[4] != '=')
+				goto only_root;
+			comma = strchr(opt, ',');
+			if (comma)
+				len = comma - (opt + 5);
+			else
+				len = strlen(opt+5);
+			pw = getpwuid(getuid());
+			if (pw == NULL || strlen(pw->pw_name) != len
+			    || strncmp(pw->pw_name, opt+5, len) != 0)
+				goto only_root;
+		}
 	}
 
-	return(ret);
+	ret = EX_SUCCESS;
+	if (mc) {
+		if (!lazy) {
+			switch (nfs_umount_is_vers4(mc)) {
+			case 0:
+				/* We ignore the error from nfs_umount23.
+				 * If the actual umount succeeds (in del_mtab),
+				 * we don't want to signal an error, as that
+				 * could cause /sbin/mount to retry!
+				 */
+				nfs_umount23(mc->m.mnt_fsname, mc->m.mnt_opts);
+				break;
+			case 1:
+				break;
+			default:
+				return EX_FAIL;
+			}
+		}
+		ret = del_mtab(mc->m.mnt_fsname, mc->m.mnt_dir);
+	} else if (*spec != '/') {
+		if (!lazy)
+			ret = nfs_umount23(spec, "tcp,v3");
+	} else
+		ret = del_mtab(NULL, spec);
+
+	return ret;
 }
-