From 901ba842cd6c42ff24e0539a1b8231b3e802e1ce Mon Sep 17 00:00:00 2001 From: Csaba Henk Date: Tue, 11 Aug 2009 18:26:11 -0700 Subject: bring in fusermount --- Makefile.am | 2 +- configure.ac | 24 + contrib/Makefile.am | 3 + contrib/fuse-lib/mount.c | 94 +++- contrib/fuse-util/COPYING | 340 +++++++++++++ contrib/fuse-util/Makefile.am | 12 + contrib/fuse-util/fusermount.c | 965 +++++++++++++++++++++++++++++++++++++ contrib/fuse-util/mount_util.h | 17 + xlators/mount/fuse/src/Makefile.am | 5 +- 9 files changed, 1454 insertions(+), 8 deletions(-) create mode 100644 contrib/Makefile.am create mode 100644 contrib/fuse-util/COPYING create mode 100644 contrib/fuse-util/Makefile.am create mode 100644 contrib/fuse-util/fusermount.c create mode 100644 contrib/fuse-util/mount_util.h diff --git a/Makefile.am b/Makefile.am index b4f0587ca..44506dfd0 100644 --- a/Makefile.am +++ b/Makefile.am @@ -1,6 +1,6 @@ EXTRA_DIST = autogen.sh COPYING INSTALL README AUTHORS THANKS NEWS glusterfs.spec -SUBDIRS = argp-standalone libglusterfs $(LIBGLUSTERFSCLIENT_SUBDIR) xlators scheduler transport auth glusterfsd $(GF_BOOSTER_SUBDIR) doc extras +SUBDIRS = argp-standalone libglusterfs $(LIBGLUSTERFSCLIENT_SUBDIR) xlators scheduler transport auth glusterfsd $(GF_BOOSTER_SUBDIR) $(FUSERMOUNT_SUBDIR) doc extras CLEANFILES = diff --git a/configure.ac b/configure.ac index 0347eb075..6a9510968 100644 --- a/configure.ac +++ b/configure.ac @@ -124,6 +124,8 @@ AC_CONFIG_FILES([Makefile extras/init.d/glusterfsd-Redhat extras/init.d/glusterfsd-SuSE extras/benchmarking/Makefile + contrib/Makefile + contrib/fuse-util/Makefile glusterfs.spec]) AC_CANONICAL_HOST @@ -216,6 +218,24 @@ AC_SUBST(FUSE_CLIENT_SUBDIR) # end FUSE section +# FUSERMOUNT section +AC_ARG_ENABLE([fusermount], + AC_HELP_STRING([--enable-fusermount], + [Build fusermount]), + [], [enable_fusermount=no]) + +BUILD_FUSERMOUNT="no" + +if test "x$enable_fusermount" != "xno"; then + FUSERMOUNT_SUBDIR="contrib" + BUILD_FUSERMOUNT="yes" + AC_DEFINE(GF_FUSERMOUNT, 1, [Use our own fusermount]) +fi + +AC_SUBST(FUSERMOUNT_SUBDIR) +#end FUSERMOUNT section + + # EPOLL section AC_ARG_ENABLE([epoll], AC_HELP_STRING([--disable-epoll], @@ -454,6 +474,9 @@ AC_SUBST(GF_LDADD) AC_SUBST(GF_FUSE_LDADD) AC_SUBST(GF_BOOSTER_SUBDIR) +CONTRIBDIR='$(top_srcdir)/contrib' +AC_SUBST(CONTRIBDIR) + AM_CONDITIONAL([GF_DARWIN_HOST_OS], test "${GF_HOST_OS}" = "GF_DARWIN_HOST_OS") AC_OUTPUT @@ -467,4 +490,5 @@ echo "epoll IO multiplex : $BUILD_EPOLL" echo "Berkeley-DB : $BUILD_BDB" echo "libglusterfsclient : $BUILD_LIBGLUSTERFSCLIENT" echo "argp-standalone : $BUILD_ARGP_STANDALONE" +echo "fusermount : $BUILD_FUSERMOUNT" echo diff --git a/contrib/Makefile.am b/contrib/Makefile.am new file mode 100644 index 000000000..a3d5cfbf8 --- /dev/null +++ b/contrib/Makefile.am @@ -0,0 +1,3 @@ +SUBDIRS = fuse-util + +CLEANFILES = diff --git a/contrib/fuse-lib/mount.c b/contrib/fuse-lib/mount.c index c9e2035d4..c6de43607 100644 --- a/contrib/fuse-lib/mount.c +++ b/contrib/fuse-lib/mount.c @@ -7,28 +7,46 @@ See the file COPYING.LIB. */ +#ifndef _CONFIG_H +#define _CONFIG_H +#include "config.h" +#endif + #include #include #include #include +#include #include #include +#include #include +#include #include #include #include #include #include +#ifdef FUSE_UTIL +#define MALLOC(size) malloc (size) +#define FREE(ptr) free (ptr) +#define GFFUSE_LOGERR(...) fprintf (stderr, ## __VA_ARGS__) +#else /* FUSE_UTIL */ #include "glusterfs.h" #include "logging.h" #include "common-utils.h" +#ifdef GF_FUSERMOUNT +#define FUSERMOUNT_PROG FUSERMOUNT_DIR "/fusermount-glusterfs" +#else #define FUSERMOUNT_PROG "fusermount" +#endif #define FUSE_COMMFD_ENV "_FUSE_COMMFD" #define GFFUSE_LOGERR(...) \ gf_log ("glusterfs-fuse", GF_LOG_ERROR, ## __VA_ARGS__) +#endif /* !FUSE_UTIL */ /* * Functions below, until following note, were taken from libfuse @@ -74,7 +92,10 @@ mtab_needs_update (const char *mnt) return 1; } -static int +#ifndef FUSE_UTIL +static +#endif +int fuse_mnt_add_mount (const char *progname, const char *fsname, const char *mnt, const char *type, const char *opts) { @@ -141,7 +162,10 @@ fuse_mnt_add_mount (const char *progname, const char *fsname, return res; } -static char +#ifndef FUSE_UTIL +static +#endif +char *fuse_mnt_resolve_path (const char *progname, const char *orig) { char buf[PATH_MAX]; @@ -208,6 +232,7 @@ static char return dst; } +#ifndef FUSE_UTIL /* return value: * >= 0 => fd * -1 => error @@ -305,8 +330,12 @@ fuse_mount_fusermount (const char *mountpoint, const char *opts) return rv; } +#endif -static int +#ifndef FUSE_UTIL +static +#endif +int fuse_mnt_umount (const char *progname, const char *mnt, int lazy) { int res; @@ -357,6 +386,62 @@ fuse_mnt_umount (const char *progname, const char *mnt, int lazy) return res; } +#ifdef FUSE_UTIL +int +fuse_mnt_check_empty (const char *progname, const char *mnt, + mode_t rootmode, off_t rootsize) +{ + int isempty = 1; + + if (S_ISDIR (rootmode)) { + struct dirent *ent; + DIR *dp = opendir (mnt); + if (dp == NULL) { + fprintf (stderr, + "%s: failed to open mountpoint for reading: %s\n", + progname, strerror (errno)); + return -1; + } + while ((ent = readdir (dp)) != NULL) { + if (strcmp (ent->d_name, ".") != 0 && + strcmp (ent->d_name, "..") != 0) { + isempty = 0; + break; + } + } + closedir (dp); + } else if (rootsize) + isempty = 0; + + if (!isempty) { + fprintf (stderr, "%s: mountpoint is not empty\n", progname); + fprintf (stderr, "%s: if you are sure this is safe, " + "use the 'nonempty' mount option\n", progname); + return -1; + } + return 0; +} + +int +fuse_mnt_check_fuseblk (void) +{ + char buf[256]; + FILE *f = fopen ("/proc/filesystems", "r"); + if (!f) + return 1; + + while (fgets (buf, sizeof (buf), f)) + if (strstr (buf, "fuseblk\n")) { + fclose (f); + return 1; + } + + fclose (f); + return 0; +} +#endif + +#ifndef FUSE_UTIL void gf_fuse_unmount (const char *mountpoint, int fd) { @@ -404,11 +489,13 @@ gf_fuse_unmount (const char *mountpoint, int fd) } waitpid (pid, NULL, 0); } +#endif /* * Functions below are loosely modelled after similar functions of libfuse */ +#ifndef FUSE_UTIL static int fuse_mount_sys (const char *mountpoint, char *fsname, char *mnt_param) { @@ -526,3 +613,4 @@ gf_fuse_mount (const char *mountpoint, char *fsname, char *mnt_param) return fd; } +#endif diff --git a/contrib/fuse-util/COPYING b/contrib/fuse-util/COPYING new file mode 100644 index 000000000..d60c31a97 --- /dev/null +++ b/contrib/fuse-util/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/contrib/fuse-util/Makefile.am b/contrib/fuse-util/Makefile.am new file mode 100644 index 000000000..06b6cb6da --- /dev/null +++ b/contrib/fuse-util/Makefile.am @@ -0,0 +1,12 @@ +bin_PROGRAMS = fusermount-glusterfs + +fusermount_glusterfs_SOURCES = fusermount.c $(CONTRIBDIR)/fuse-lib/mount.c +noinst_HEADERS = mount_util.h + +AM_CFLAGS = -Wall -D_FILE_OFFSET_BITS=64 -DFUSE_UTIL $(GF_CFLAGS) + +install-exec-hook: + chown root $(DESTDIR)$(bindir)/fusermount-glusterfs + chmod u+s $(DESTDIR)$(bindir)/fusermount-glusterfs + +CLEANFILES = diff --git a/contrib/fuse-util/fusermount.c b/contrib/fuse-util/fusermount.c new file mode 100644 index 000000000..c3ecc86cc --- /dev/null +++ b/contrib/fuse-util/fusermount.c @@ -0,0 +1,965 @@ +/* + FUSE: Filesystem in Userspace + Copyright (C) 2001-2007 Miklos Szeredi + + This program can be distributed under the terms of the GNU GPL. + See the file COPYING. +*/ +/* This program does the mounting and unmounting of FUSE filesystems */ + +#include + +#include "mount_util.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define FUSE_COMMFD_ENV "_FUSE_COMMFD" + +#define FUSE_DEV_OLD "/proc/fs/fuse/dev" +#define FUSE_DEV_NEW "/dev/fuse" +#define FUSE_VERSION_FILE_OLD "/proc/fs/fuse/version" +#define FUSE_CONF "/etc/fuse.conf" + +#ifndef MS_DIRSYNC +#define MS_DIRSYNC 128 +#endif + +static const char *progname; + +static int user_allow_other = 0; +static int mount_max = 1000; + +static const char *get_user_name(void) +{ + struct passwd *pw = getpwuid(getuid()); + if (pw != NULL && pw->pw_name != NULL) + return pw->pw_name; + else { + fprintf(stderr, "%s: could not determine username\n", progname); + return NULL; + } +} + +static uid_t oldfsuid; +static gid_t oldfsgid; + +static void drop_privs(void) +{ + if (getuid() != 0) { + oldfsuid = setfsuid(getuid()); + oldfsgid = setfsgid(getgid()); + } +} + +static void restore_privs(void) +{ + if (getuid() != 0) { + setfsuid(oldfsuid); + setfsgid(oldfsgid); + } +} + +#ifndef IGNORE_MTAB +static int add_mount(const char *source, const char *mnt, const char *type, + const char *opts) +{ + return fuse_mnt_add_mount(progname, source, mnt, type, opts); +} + +static int unmount_fuse(const char *mnt, int quiet, int lazy) +{ + if (getuid() != 0) { + struct mntent *entp; + FILE *fp; + const char *user = NULL; + char uidstr[32]; + unsigned uidlen = 0; + int found; + const char *mtab = _PATH_MOUNTED; + + user = get_user_name(); + if (user == NULL) + return -1; + + fp = setmntent(mtab, "r"); + if (fp == NULL) { + fprintf(stderr, + "%s: failed to open %s: %s\n", progname, mtab, + strerror(errno)); + return -1; + } + + uidlen = sprintf(uidstr, "%u", getuid()); + + found = 0; + while ((entp = getmntent(fp)) != NULL) { + if (!found && strcmp(entp->mnt_dir, mnt) == 0 && + (strcmp(entp->mnt_type, "fuse") == 0 || + strcmp(entp->mnt_type, "fuseblk") == 0 || + strncmp(entp->mnt_type, "fuse.", 5) == 0 || + strncmp(entp->mnt_type, "fuseblk.", 8) == 0)) { + char *p = strstr(entp->mnt_opts, "user="); + if (p && + (p == entp->mnt_opts || *(p-1) == ',') && + strcmp(p + 5, user) == 0) { + found = 1; + break; + } + /* /etc/mtab is a link pointing to + /proc/mounts: */ + else if ((p = + strstr(entp->mnt_opts, "user_id=")) && + (p == entp->mnt_opts || + *(p-1) == ',') && + strncmp(p + 8, uidstr, uidlen) == 0 && + (*(p+8+uidlen) == ',' || + *(p+8+uidlen) == '\0')) { + found = 1; + break; + } + } + } + endmntent(fp); + + if (!found) { + if (!quiet) + fprintf(stderr, + "%s: entry for %s not found in %s\n", + progname, mnt, mtab); + return -1; + } + } + + return fuse_mnt_umount(progname, mnt, lazy); +} + +static int count_fuse_fs(void) +{ + struct mntent *entp; + int count = 0; + const char *mtab = _PATH_MOUNTED; + FILE *fp = setmntent(mtab, "r"); + if (fp == NULL) { + fprintf(stderr, "%s: failed to open %s: %s\n", progname, mtab, + strerror(errno)); + return -1; + } + while ((entp = getmntent(fp)) != NULL) { + if (strcmp(entp->mnt_type, "fuse") == 0 || + strncmp(entp->mnt_type, "fuse.", 5) == 0) + count ++; + } + endmntent(fp); + return count; +} + + +#else /* IGNORE_MTAB */ +static int count_fuse_fs() +{ + return 0; +} + +static int add_mount(const char *source, const char *mnt, const char *type, + const char *opts) +{ + (void) source; + (void) mnt; + (void) type; + (void) opts; + return 0; +} + +static int unmount_fuse(const char *mnt, int quiet, int lazy) +{ + return fuse_mnt_umount(progname, mnt, lazy); +} +#endif /* IGNORE_MTAB */ + +static void strip_line(char *line) +{ + char *s = strchr(line, '#'); + if (s != NULL) + s[0] = '\0'; + for (s = line + strlen(line) - 1; + s >= line && isspace((unsigned char) *s); s--); + s[1] = '\0'; + for (s = line; isspace((unsigned char) *s); s++); + if (s != line) + memmove(line, s, strlen(s)+1); +} + +static void parse_line(char *line, int linenum) +{ + int tmp; + if (strcmp(line, "user_allow_other") == 0) + user_allow_other = 1; + else if (sscanf(line, "mount_max = %i", &tmp) == 1) + mount_max = tmp; + else if(line[0]) + fprintf(stderr, + "%s: unknown parameter in %s at line %i: '%s'\n", + progname, FUSE_CONF, linenum, line); +} + +static void read_conf(void) +{ + FILE *fp = fopen(FUSE_CONF, "r"); + if (fp != NULL) { + int linenum = 1; + char line[256]; + int isnewline = 1; + while (fgets(line, sizeof(line), fp) != NULL) { + if (isnewline) { + if (line[strlen(line)-1] == '\n') { + strip_line(line); + parse_line(line, linenum); + } else { + isnewline = 0; + } + } else if(line[strlen(line)-1] == '\n') { + fprintf(stderr, "%s: reading %s: line %i too long\n", progname, FUSE_CONF, linenum); + + isnewline = 1; + } + if (isnewline) + linenum ++; + } + if (!isnewline) { + fprintf(stderr, "%s: reading %s: missing newline at end of file\n", progname, FUSE_CONF); + + } + fclose(fp); + } else if (errno != ENOENT) { + fprintf(stderr, "%s: failed to open %s: %s\n", + progname, FUSE_CONF, strerror(errno)); + } +} + +static int begins_with(const char *s, const char *beg) +{ + if (strncmp(s, beg, strlen(beg)) == 0) + return 1; + else + return 0; +} + +struct mount_flags { + const char *opt; + unsigned long flag; + int on; + int safe; +}; + +static struct mount_flags mount_flags[] = { + {"rw", MS_RDONLY, 0, 1}, + {"ro", MS_RDONLY, 1, 1}, + {"suid", MS_NOSUID, 0, 0}, + {"nosuid", MS_NOSUID, 1, 1}, + {"dev", MS_NODEV, 0, 0}, + {"nodev", MS_NODEV, 1, 1}, + {"exec", MS_NOEXEC, 0, 1}, + {"noexec", MS_NOEXEC, 1, 1}, + {"async", MS_SYNCHRONOUS, 0, 1}, + {"sync", MS_SYNCHRONOUS, 1, 1}, + {"atime", MS_NOATIME, 0, 1}, + {"noatime", MS_NOATIME, 1, 1}, + {"dirsync", MS_DIRSYNC, 1, 1}, + {NULL, 0, 0, 0} +}; + +static int find_mount_flag(const char *s, unsigned len, int *on, int *flag) +{ + int i; + + for (i = 0; mount_flags[i].opt != NULL; i++) { + const char *opt = mount_flags[i].opt; + if (strlen(opt) == len && strncmp(opt, s, len) == 0) { + *on = mount_flags[i].on; + *flag = mount_flags[i].flag; + if (!mount_flags[i].safe && getuid() != 0) { + *flag = 0; + fprintf(stderr, + "%s: unsafe option %s ignored\n", + progname, opt); + } + return 1; + } + } + return 0; +} + +static int add_option(char **optsp, const char *opt, unsigned expand) +{ + char *newopts; + if (*optsp == NULL) + newopts = strdup(opt); + else { + unsigned oldsize = strlen(*optsp); + unsigned newsize = oldsize + 1 + strlen(opt) + expand + 1; + newopts = (char *) realloc(*optsp, newsize); + if (newopts) + sprintf(newopts + oldsize, ",%s", opt); + } + if (newopts == NULL) { + fprintf(stderr, "%s: failed to allocate memory\n", progname); + return -1; + } + *optsp = newopts; + return 0; +} + +static int get_mnt_opts(int flags, char *opts, char **mnt_optsp) +{ + int i; + int l; + + if (!(flags & MS_RDONLY) && add_option(mnt_optsp, "rw", 0) == -1) + return -1; + + for (i = 0; mount_flags[i].opt != NULL; i++) { + if (mount_flags[i].on && (flags & mount_flags[i].flag) && + add_option(mnt_optsp, mount_flags[i].opt, 0) == -1) + return -1; + } + + if (add_option(mnt_optsp, opts, 0) == -1) + return -1; + /* remove comma from end of opts*/ + l = strlen(*mnt_optsp); + if ((*mnt_optsp)[l-1] == ',') + (*mnt_optsp)[l-1] = '\0'; + if (getuid() != 0) { + const char *user = get_user_name(); + if (user == NULL) + return -1; + + if (add_option(mnt_optsp, "user=", strlen(user)) == -1) + return -1; + strcat(*mnt_optsp, user); + } + return 0; +} + +static int opt_eq(const char *s, unsigned len, const char *opt) +{ + if(strlen(opt) == len && strncmp(s, opt, len) == 0) + return 1; + else + return 0; +} + +static int get_string_opt(const char *s, unsigned len, const char *opt, + char **val) +{ + unsigned opt_len = strlen(opt); + + if (*val) + free(*val); + *val = (char *) malloc(len - opt_len + 1); + if (!*val) { + fprintf(stderr, "%s: failed to allocate memory\n", progname); + return 0; + } + + memcpy(*val, s + opt_len, len - opt_len); + (*val)[len - opt_len] = '\0'; + return 1; +} + +static int do_mount(const char *mnt, char **typep, mode_t rootmode, + int fd, const char *opts, const char *dev, char **sourcep, + char **mnt_optsp, off_t rootsize) +{ + int res; + int flags = MS_NOSUID | MS_NODEV; + char *optbuf; + char *mnt_opts = NULL; + const char *s; + char *d; + char *fsname = NULL; + char *subtype = NULL; + char *source = NULL; + char *type = NULL; + int check_empty = 1; + int blkdev = 0; + + optbuf = (char *) malloc(strlen(opts) + 128); + if (!optbuf) { + fprintf(stderr, "%s: failed to allocate memory\n", progname); + return -1; + } + + for (s = opts, d = optbuf; *s;) { + unsigned len; + const char *fsname_str = "fsname="; + const char *subtype_str = "subtype="; + for (len = 0; s[len] && s[len] != ','; len++); + if (begins_with(s, fsname_str)) { + if (!get_string_opt(s, len, fsname_str, &fsname)) + goto err; + } else if (begins_with(s, subtype_str)) { + if (!get_string_opt(s, len, subtype_str, &subtype)) + goto err; + } else if (opt_eq(s, len, "blkdev")) { + if (getuid() != 0) { + fprintf(stderr, + "%s: option blkdev is privileged\n", + progname); + goto err; + } + blkdev = 1; + } else if (opt_eq(s, len, "nonempty")) { + check_empty = 0; + } else if (!begins_with(s, "fd=") && + !begins_with(s, "rootmode=") && + !begins_with(s, "user_id=") && + !begins_with(s, "group_id=")) { + int on; + int flag; + int skip_option = 0; + if (opt_eq(s, len, "large_read")) { + struct utsname utsname; + unsigned kmaj, kmin; + res = uname(&utsname); + if (res == 0 && + sscanf(utsname.release, "%u.%u", + &kmaj, &kmin) == 2 && + (kmaj > 2 || (kmaj == 2 && kmin > 4))) { + fprintf(stderr, "%s: note: 'large_read' mount option is deprecated for %i.%i kernels\n", progname, kmaj, kmin); + skip_option = 1; + } + } + if (getuid() != 0 && !user_allow_other && + (opt_eq(s, len, "allow_other") || + opt_eq(s, len, "allow_root"))) { + fprintf(stderr, "%s: option %.*s only allowed if 'user_allow_other' is set in /etc/fuse.conf\n", progname, len, s); + goto err; + } + if (!skip_option) { + if (find_mount_flag(s, len, &on, &flag)) { + if (on) + flags |= flag; + else + flags &= ~flag; + } else { + memcpy(d, s, len); + d += len; + *d++ = ','; + } + } + } + s += len; + if (*s) + s++; + } + *d = '\0'; + res = get_mnt_opts(flags, optbuf, &mnt_opts); + if (res == -1) + goto err; + + sprintf(d, "fd=%i,rootmode=%o,user_id=%i,group_id=%i", + fd, rootmode, getuid(), getgid()); + + if (check_empty && + fuse_mnt_check_empty(progname, mnt, rootmode, rootsize) == -1) + goto err; + + source = malloc((fsname ? strlen(fsname) : 0) + + (subtype ? strlen(subtype) : 0) + strlen(dev) + 32); + + type = malloc((subtype ? strlen(subtype) : 0) + 32); + if (!type || !source) { + fprintf(stderr, "%s: failed to allocate memory\n", progname); + goto err; + } + + if (subtype) + sprintf(type, "%s.%s", blkdev ? "fuseblk" : "fuse", subtype); + else + strcpy(type, blkdev ? "fuseblk" : "fuse"); + + if (fsname) + strcpy(source, fsname); + else + strcpy(source, subtype ? subtype : dev); + + res = mount(source, mnt, type, flags, optbuf); + if (res == -1 && errno == ENODEV && subtype) { + /* Probably missing subtype support */ + strcpy(type, blkdev ? "fuseblk" : "fuse"); + if (fsname) { + if (!blkdev) + sprintf(source, "%s#%s", subtype, fsname); + } else { + strcpy(source, type); + } + + res = mount(source, mnt, type, flags, optbuf); + } + if (res == -1 && errno == EINVAL) { + /* It could be an old version not supporting group_id */ + sprintf(d, "fd=%i,rootmode=%o,user_id=%i", + fd, rootmode, getuid()); + res = mount(source, mnt, type, flags, optbuf); + } + if (res == -1) { + int errno_save = errno; + if (blkdev && errno == ENODEV && !fuse_mnt_check_fuseblk()) + fprintf(stderr, "%s: 'fuseblk' support missing\n", + progname); + else + fprintf(stderr, "%s: mount failed: %s\n", progname, + strerror(errno_save)); + goto err; + } else { + *sourcep = source; + *typep = type; + *mnt_optsp = mnt_opts; + } + free(fsname); + free(optbuf); + + return res; + +err: + free(fsname); + free(subtype); + free(source); + free(type); + free(mnt_opts); + free(optbuf); + return -1; +} + +static int check_version(const char *dev) +{ + int res; + int majorver; + int minorver; + const char *version_file; + FILE *vf; + + if (strcmp(dev, FUSE_DEV_OLD) != 0) + return 0; + + version_file = FUSE_VERSION_FILE_OLD; + vf = fopen(version_file, "r"); + if (vf == NULL) { + fprintf(stderr, "%s: kernel interface too old\n", progname); + return -1; + } + res = fscanf(vf, "%i.%i", &majorver, &minorver); + fclose(vf); + if (res != 2) { + fprintf(stderr, "%s: error reading %s\n", progname, + version_file); + return -1; + } + if (majorver < 3) { + fprintf(stderr, "%s: kernel interface too old\n", progname); + return -1; + } + return 0; +} + +static int check_perm(const char **mntp, struct stat *stbuf, int *currdir_fd, + int *mountpoint_fd) +{ + int res; + const char *mnt = *mntp; + const char *origmnt = mnt; + + res = lstat(mnt, stbuf); + if (res == -1) { + fprintf(stderr, "%s: failed to access mountpoint %s: %s\n", + progname, mnt, strerror(errno)); + return -1; + } + + /* No permission checking is done for root */ + if (getuid() == 0) + return 0; + + if (S_ISDIR(stbuf->st_mode)) { + *currdir_fd = open(".", O_RDONLY); + if (*currdir_fd == -1) { + fprintf(stderr, + "%s: failed to open current directory: %s\n", + progname, strerror(errno)); + return -1; + } + res = chdir(mnt); + if (res == -1) { + fprintf(stderr, + "%s: failed to chdir to mountpoint: %s\n", + progname, strerror(errno)); + return -1; + } + mnt = *mntp = "."; + res = lstat(mnt, stbuf); + if (res == -1) { + fprintf(stderr, + "%s: failed to access mountpoint %s: %s\n", + progname, origmnt, strerror(errno)); + return -1; + } + + if ((stbuf->st_mode & S_ISVTX) && stbuf->st_uid != getuid()) { + fprintf(stderr, "%s: mountpoint %s not owned by user\n", + progname, origmnt); + return -1; + } + + res = access(mnt, W_OK); + if (res == -1) { + fprintf(stderr, "%s: user has no write access to mountpoint %s\n", + progname, origmnt); + return -1; + } + } else if (S_ISREG(stbuf->st_mode)) { + static char procfile[256]; + *mountpoint_fd = open(mnt, O_WRONLY); + if (*mountpoint_fd == -1) { + fprintf(stderr, "%s: failed to open %s: %s\n", + progname, mnt, strerror(errno)); + return -1; + } + res = fstat(*mountpoint_fd, stbuf); + if (res == -1) { + fprintf(stderr, + "%s: failed to access mountpoint %s: %s\n", + progname, mnt, strerror(errno)); + return -1; + } + if (!S_ISREG(stbuf->st_mode)) { + fprintf(stderr, + "%s: mountpoint %s is no longer a regular file\n", + progname, mnt); + return -1; + } + + sprintf(procfile, "/proc/self/fd/%i", *mountpoint_fd); + *mntp = procfile; + } else { + fprintf(stderr, + "%s: mountpoint %s is not a directory or a regular file\n", + progname, mnt); + return -1; + } + + + return 0; +} + +static int try_open(const char *dev, char **devp, int silent) +{ + int fd = open(dev, O_RDWR); + if (fd != -1) { + *devp = strdup(dev); + if (*devp == NULL) { + fprintf(stderr, "%s: failed to allocate memory\n", + progname); + close(fd); + fd = -1; + } + } else if (errno == ENODEV || + errno == ENOENT)/* check for ENOENT too, for the udev case */ + return -2; + else if (!silent) { + fprintf(stderr, "%s: failed to open %s: %s\n", progname, dev, + strerror(errno)); + } + return fd; +} + +static int try_open_fuse_device(char **devp) +{ + int fd; + int err; + + drop_privs(); + fd = try_open(FUSE_DEV_NEW, devp, 0); + restore_privs(); + if (fd >= 0) + return fd; + + err = fd; + fd = try_open(FUSE_DEV_OLD, devp, 1); + if (fd >= 0) + return fd; + + return err; +} + +static int open_fuse_device(char **devp) +{ + int fd = try_open_fuse_device(devp); + if (fd >= -1) + return fd; + + fprintf(stderr, + "%s: fuse device not found, try 'modprobe fuse' first\n", + progname); + + return -1; +} + + +static int mount_fuse(const char *mnt, const char *opts) +{ + int res; + int fd; + char *dev; + struct stat stbuf; + char *type = NULL; + char *source = NULL; + char *mnt_opts = NULL; + const char *real_mnt = mnt; + int currdir_fd = -1; + int mountpoint_fd = -1; + + fd = open_fuse_device(&dev); + if (fd == -1) + return -1; + + drop_privs(); + read_conf(); + + if (getuid() != 0 && mount_max != -1) { + int mount_count = count_fuse_fs(); + if (mount_count >= mount_max) { + fprintf(stderr, "%s: too many FUSE filesystems mounted; mount_max=N can be set in /etc/fuse.conf\n", progname); + close(fd); + return -1; + } + } + + res = check_version(dev); + if (res != -1) { + res = check_perm(&real_mnt, &stbuf, &currdir_fd, + &mountpoint_fd); + restore_privs(); + if (res != -1) + res = do_mount(real_mnt, &type, stbuf.st_mode & S_IFMT, + fd, opts, dev, &source, &mnt_opts, + stbuf.st_size); + } else + restore_privs(); + + if (currdir_fd != -1) { + fchdir(currdir_fd); + close(currdir_fd); + } + if (mountpoint_fd != -1) + close(mountpoint_fd); + + if (res == -1) { + close(fd); + return -1; + } + + if (geteuid() == 0) { + res = add_mount(source, mnt, type, mnt_opts); + if (res == -1) { + umount2(mnt, 2); /* lazy umount */ + close(fd); + return -1; + } + } + + free(source); + free(type); + free(mnt_opts); + free(dev); + + return fd; +} + +static int send_fd(int sock_fd, int fd) +{ + int retval; + struct msghdr msg; + struct cmsghdr *p_cmsg; + struct iovec vec; + size_t cmsgbuf[CMSG_SPACE(sizeof(fd)) / sizeof(size_t)]; + int *p_fds; + char sendchar = 0; + + msg.msg_control = cmsgbuf; + msg.msg_controllen = sizeof(cmsgbuf); + p_cmsg = CMSG_FIRSTHDR(&msg); + p_cmsg->cmsg_level = SOL_SOCKET; + p_cmsg->cmsg_type = SCM_RIGHTS; + p_cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); + p_fds = (int *) CMSG_DATA(p_cmsg); + *p_fds = fd; + msg.msg_controllen = p_cmsg->cmsg_len; + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_iov = &vec; + msg.msg_iovlen = 1; + msg.msg_flags = 0; + /* "To pass file descriptors or credentials you need to send/read at + * least one byte" (man 7 unix) */ + vec.iov_base = &sendchar; + vec.iov_len = sizeof(sendchar); + while ((retval = sendmsg(sock_fd, &msg, 0)) == -1 && errno == EINTR); + if (retval != 1) { + perror("sending file descriptor"); + return -1; + } + return 0; +} + +static void usage(void) +{ + fprintf(stderr, + "%s: [options] mountpoint\n" + "Options:\n" + " -h print help\n" + " -V print version\n" + " -o opt[,opt...] mount options\n" + " -u unmount\n" + " -q quiet\n" + " -z lazy unmount\n", + progname); + exit(1); +} + +static void show_version(void) +{ + printf("fusermount version: %s\n", PACKAGE_VERSION); + exit(0); +} + +int main(int argc, char *argv[]) +{ + int ch; + int fd; + int res; + char *origmnt; + char *mnt; + static int unmount = 0; + static int lazy = 0; + static int quiet = 0; + char *commfd; + int cfd; + const char *opts = ""; + + static const struct option long_opts[] = { + {"unmount", no_argument, NULL, 'u'}, + {"lazy", no_argument, NULL, 'z'}, + {"quiet", no_argument, NULL, 'q'}, + {"help", no_argument, NULL, 'h'}, + {"version", no_argument, NULL, 'V'}, + {0, 0, 0, 0}}; + + progname = strdup(argv[0]); + if (progname == NULL) { + fprintf(stderr, "%s: failed to allocate memory\n", argv[0]); + exit(1); + } + + while ((ch = getopt_long(argc, argv, "hVo:uzq", long_opts, + NULL)) != -1) { + switch (ch) { + case 'h': + usage(); + break; + + case 'V': + show_version(); + break; + + case 'o': + opts = optarg; + break; + + case 'u': + unmount = 1; + break; + + case 'z': + lazy = 1; + break; + + case 'q': + quiet = 1; + break; + + default: + exit(1); + } + } + + if (lazy && !unmount) { + fprintf(stderr, "%s: -z can only be used with -u\n", progname); + exit(1); + } + + if (optind >= argc) { + fprintf(stderr, "%s: missing mountpoint argument\n", progname); + exit(1); + } else if (argc > optind + 1) { + fprintf(stderr, "%s: extra arguments after the mountpoint\n", + progname); + exit(1); + } + + origmnt = argv[optind]; + + drop_privs(); + mnt = fuse_mnt_resolve_path(progname, origmnt); + restore_privs(); + if (mnt == NULL) + exit(1); + + umask(033); + if (unmount) { + if (geteuid() == 0) + res = unmount_fuse(mnt, quiet, lazy); + else { + res = umount2(mnt, lazy ? 2 : 0); + if (res == -1 && !quiet) + fprintf(stderr, + "%s: failed to unmount %s: %s\n", + progname, mnt, strerror(errno)); + } + if (res == -1) + exit(1); + return 0; + } + + commfd = getenv(FUSE_COMMFD_ENV); + if (commfd == NULL) { + fprintf(stderr, "%s: old style mounting not supported\n", + progname); + exit(1); + } + + fd = mount_fuse(mnt, opts); + if (fd == -1) + exit(1); + + cfd = atoi(commfd); + res = send_fd(cfd, fd); + if (res == -1) + exit(1); + + return 0; +} diff --git a/contrib/fuse-util/mount_util.h b/contrib/fuse-util/mount_util.h new file mode 100644 index 000000000..cf54d9d0d --- /dev/null +++ b/contrib/fuse-util/mount_util.h @@ -0,0 +1,17 @@ +/* + FUSE: Filesystem in Userspace + Copyright (C) 2001-2007 Miklos Szeredi + + This program can be distributed under the terms of the GNU LGPLv2. + See the file COPYING.LIB. +*/ + +#include + +int fuse_mnt_add_mount(const char *progname, const char *fsname, + const char *mnt, const char *type, const char *opts); +int fuse_mnt_umount(const char *progname, const char *mnt, int lazy); +char *fuse_mnt_resolve_path(const char *progname, const char *orig); +int fuse_mnt_check_empty(const char *progname, const char *mnt, + mode_t rootmode, off_t rootsize); +int fuse_mnt_check_fuseblk(void); diff --git a/xlators/mount/fuse/src/Makefile.am b/xlators/mount/fuse/src/Makefile.am index 0231e7be0..a4d1fd760 100644 --- a/xlators/mount/fuse/src/Makefile.am +++ b/xlators/mount/fuse/src/Makefile.am @@ -1,6 +1,3 @@ - -CONTRIBDIR = $(top_srcdir)/contrib - noinst_HEADERS = $(CONTRIBDIR)/fuse-include/fuse_kernel.h xlator_LTLIBRARIES = fuse.la @@ -11,7 +8,7 @@ fuse_la_LDFLAGS = -module -avoidversion -shared -nostartfiles AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D$(GF_HOST_OS) -Wall \ -I$(top_srcdir)/libglusterfs/src -I$(CONTRIBDIR)/fuse-include \ - $(GF_CFLAGS) -DFUSE_USE_VERSION=26 + $(GF_CFLAGS) -DFUSERMOUNT_DIR=\"$(bindir)\" CLEANFILES = -- cgit