X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fmount.c;h=6ae6b79962c73fbbd7a852e661a6c8e9eeeb3ebe;hp=ca87e3d1b7fb60bc04d7e3504a7bcb4985e79b38;hb=46704243eb10718c722607cc7f66703e3eb3ac9c;hpb=ceeffc1f76485b4084b2c61f4ff3c40e4f51c3b8 diff --git a/utils/mount/mount.c b/utils/mount/mount.c index ca87e3d..6ae6b79 100644 --- a/utils/mount/mount.c +++ b/utils/mount/mount.c @@ -26,23 +26,33 @@ #include #include #include +#include #include #include +#include #include "fstab.h" #include "xcommon.h" +#include "nls.h" #include "mount_constants.h" #include "nfs_paths.h" #include "nfs_mount.h" #include "nfs4_mount.h" -#include "nfsumount.h" #include "mount.h" +#include "error.h" +#include "network.h" +#include "stropts.h" char *progname; +int nfs_mount_data_version; int nomtab; int verbose; -int mounttype; +int sloppy; +int string; + +#define FOREGROUND (0) +#define BACKGROUND (1) static struct option longopts[] = { { "fake", 0, 0, 'f' }, @@ -55,23 +65,17 @@ static struct option longopts[] = { { "read-write", 0, 0, 'w' }, { "rw", 0, 0, 'w' }, { "options", 1, 0, 'o' }, - { "nfsvers", 1, 0, 't' }, - { "bind", 0, 0, 128 }, - { "replace", 0, 0, 129 }, - { "after", 0, 0, 130 }, - { "before", 0, 0, 131 }, - { "over", 0, 0, 132 }, - { "move", 0, 0, 133 }, - { "rbind", 0, 0, 135 }, { NULL, 0, 0, 0 } }; -/* Map from -o and fstab option strings to the flag argument to mount(2). */ +/* + * Map from -o and fstab option strings to the flag argument to mount(2). + */ struct opt_map { - const char *opt; /* option name */ - int skip; /* skip in mtab option string */ - int inv; /* true if flag value should be inverted */ - int mask; /* flag mask value */ + const char *opt; /* option name */ + int skip; /* skip in mtab option string */ + int inv; /* true if flag value should be inverted */ + int mask; /* flag mask value */ }; static const struct opt_map opt_map[] = { @@ -90,6 +94,18 @@ static const struct opt_map opt_map[] = { { "remount", 0, 0, MS_REMOUNT}, /* Alter flags of mounted FS */ { "bind", 0, 0, MS_BIND }, /* Remount part of tree elsewhere */ { "rbind", 0, 0, MS_BIND|MS_REC }, /* Idem, plus mounted subtrees */ + { "auto", 0, 0, MS_DUMMY }, /* Can be mounted using -a */ + { "noauto", 0, 0, MS_DUMMY }, /* Can only be mounted explicitly */ + { "users", 1, 0, MS_USERS }, /* Allow ordinary user to mount */ + { "nousers", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */ + { "user", 1, 0, MS_USER }, /* Allow ordinary user to mount */ + { "nouser", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */ + { "owner", 0, 0, MS_DUMMY }, /* Let the owner of the device mount */ + { "noowner", 0, 0, MS_DUMMY }, /* Device owner has no special privs */ + { "group", 0, 0, MS_DUMMY }, /* Let the group of the device mount */ + { "nogroup", 0, 0, MS_DUMMY }, /* Device group has no special privs */ + { "_netdev", 0, 0, MS_DUMMY}, /* Device requires network */ + { "comment", 0, 0, MS_DUMMY}, /* fstab comment only (kudzu,_netdev)*/ /* add new options here */ #ifdef MS_NOSUB @@ -104,6 +120,7 @@ static const struct opt_map opt_map[] = { { "mand", 0, 0, MS_MANDLOCK }, /* Allow mandatory locks on this FS */ { "nomand", 0, 1, MS_MANDLOCK }, /* Forbid mandatory locks on this FS */ #endif + { "loop", 1, 0, MS_DUMMY }, /* use a loop device */ #ifdef MS_NOATIME { "atime", 0, 1, MS_NOATIME }, /* Update access time */ { "noatime", 0, 0, MS_NOATIME }, /* Do not update access time */ @@ -115,12 +132,83 @@ static const struct opt_map opt_map[] = { { NULL, 0, 0, 0 } }; -/* Try to build a canonical options string. */ -static char * fix_opts_string (int flags, const char *extra_opts) { +#define MAKE_VERSION(p,q,r) (65536 * (p) + 256 * (q) + (r)) + +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; +} + +/* + * Choose the version of the nfs_mount_data structure that is appropriate + * for the kernel that is doing the mount. + * + * NFS_MOUNT_VERSION: maximum version supported by these sources + * nfs_mount_data_version: maximum version supported by the running kernel + */ +static void discover_nfs_mount_data_version(void) +{ + int kernel_version = linux_version_code(); + + if (kernel_version) { + if (kernel_version < MAKE_VERSION(2, 1, 32)) + nfs_mount_data_version = 1; + else if (kernel_version < MAKE_VERSION(2, 2, 18)) + nfs_mount_data_version = 3; + else if (kernel_version < MAKE_VERSION(2, 3, 0)) + nfs_mount_data_version = 4; + else if (kernel_version < MAKE_VERSION(2, 3, 99)) + nfs_mount_data_version = 3; + else if (kernel_version < MAKE_VERSION(2, 6, 3)) + nfs_mount_data_version = 4; + else + nfs_mount_data_version = 6; + } + if (nfs_mount_data_version > NFS_MOUNT_VERSION) + nfs_mount_data_version = NFS_MOUNT_VERSION; + else + if (kernel_version > MAKE_VERSION(2, 6, 22)) + string++; +} + +static void print_one(char *spec, char *node, char *type, char *opts) +{ + if (!verbose) + return; + + if (opts) + printf(_("%s on %s type %s (%s)\n"), spec, node, type, opts); + else + printf(_("%s on %s type %s\n"), spec, node, type); +} + +/* + * Build a canonical mount option string for /etc/mtab. + */ +static char *fix_opts_string(int flags, const char *extra_opts) +{ const struct opt_map *om; char *new_opts; new_opts = xstrdup((flags & MS_RDONLY) ? "ro" : "rw"); + if (flags & MS_USER) { + /* record who mounted this so they can unmount */ + struct passwd *pw = getpwuid(getuid()); + if(pw) + new_opts = xstrconcat3(new_opts, ",user=", pw->pw_name); + } + if (flags & MS_USERS) + new_opts = xstrconcat3(new_opts, ",users", ""); + for (om = opt_map; om->opt != NULL; om++) { if (om->skip) continue; @@ -135,72 +223,76 @@ static char * fix_opts_string (int flags, const char *extra_opts) { return new_opts; } - -int add_mtab(char *fsname, char *mount_point, char *fstype, int flags, char *opts, int freq, int passno) +static int add_mtab(char *spec, char *mount_point, char *fstype, + int flags, char *opts, int freq, int pass) { struct mntent ment; - int fd; FILE *mtab; + int result = EX_FILEIO; - ment.mnt_fsname = fsname; + ment.mnt_fsname = spec; ment.mnt_dir = mount_point; ment.mnt_type = fstype; ment.mnt_opts = fix_opts_string(flags, opts); - ment.mnt_freq = 0; - ment.mnt_passno= 0; + ment.mnt_freq = freq; + ment.mnt_passno = pass; - if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1) { - fprintf(stderr, "Can't get "MOUNTED"~ lock file"); - return 1; + if (flags & MS_REMOUNT) { + update_mtab(ment.mnt_dir, &ment); + free(ment.mnt_opts); + return EX_SUCCESS; } - close(fd); - if ((mtab = setmntent(MOUNTED, "a+")) == NULL) { - fprintf(stderr, "Can't open " MOUNTED); - return 1; + lock_mtab(); + + if ((mtab = setmntent(MOUNTED, "a+")) == NULL) { + unlock_mtab(); + nfs_error(_("Can't open mtab: %s"), + strerror(errno)); + goto fail_unlock; } - if (addmntent(mtab, &ment) == 1) { - fprintf(stderr, "Can't write mount entry"); - return 1; + if (addmntent(mtab, &ment) == 1) { + nfs_error(_("Can't write mount entry to mtab: %s"), + strerror(errno)); + goto fail_close; } - if (fchmod(fileno(mtab), 0644) == -1) { - fprintf(stderr, "Can't set perms on " MOUNTED); - return 1; + if (fchmod(fileno(mtab), 0644) == -1) { + nfs_error(_("Can't set permissions on mtab: %s"), + strerror(errno)); + goto fail_close; } - endmntent(mtab); + result = EX_SUCCESS; - if (unlink(MOUNTED"~") == -1) { - fprintf(stderr, "Can't remove "MOUNTED"~"); - return 1; - } +fail_close: + endmntent(mtab); +fail_unlock: + unlock_mtab(); + free(ment.mnt_opts); - return 0; + return result; } -int do_mount_syscall(char *spec, char *node, char *type, int flags, void *data) +void mount_usage(void) { - return mount(spec, node, type, flags, data); + printf(_("usage: %s remotetarget dir [-rvVwfnsih] [-o nfsoptions]\n"), + progname); + printf(_("options:\n")); + printf(_("\t-r\t\tMount file system readonly\n")); + printf(_("\t-v\t\tVerbose\n")); + printf(_("\t-V\t\tPrint version\n")); + printf(_("\t-w\t\tMount file system read-write\n")); + printf(_("\t-f\t\tFake mount, do not actually mount\n")); + printf(_("\t-n\t\tDo not update /etc/mtab\n")); + printf(_("\t-s\t\tTolerate sloppy mount options rather than fail\n")); + printf(_("\t-h\t\tPrint this help\n")); + printf(_("\tnfsoptions\tRefer to mount.nfs(8) or nfs(5)\n\n")); } -void mount_usage() +static void parse_opt(const char *opt, int *mask, char *extra_opts, int len) { - printf("usage: %s remotetarget dir [-rvVwfnh] [-t version] [-o nfsoptions]\n", progname); - printf("options:\n\t-r\t\tMount file system readonly\n"); - printf("\t-v\t\tVerbose\n"); - printf("\t-V\t\tPrint version\n"); - printf("\t-w\t\tMount file system read-write\n"); - printf("\t-f\t\tFake mount, don't actually mount\n"); - printf("\t-n\t\tDo not update /etc/mtab\n"); - printf("\t-h\t\tPrint this help\n"); - printf("\tversion\t\tnfs4 - NFS version 4, nfs - older NFS version supported\n"); - printf("\tnfsoptions\tRefer mount.nfs(8) or nfs(5)\n\n"); -} - -static inline void -parse_opt(const char *opt, int *mask, char *extra_opts, int len) { const struct opt_map *om; for (om = opt_map; om->opt != NULL; om++) { @@ -222,94 +314,136 @@ parse_opt(const char *opt, int *mask, char *extra_opts, int len) { strcat(extra_opts, opt); } -/* Take -o options list and compute 4th and 5th args to mount(2). flags - gets the standard options (indicated by bits) and extra_opts all the rest */ -static void parse_opts (const char *options, int *flags, char **extra_opts) +/* + * Convert the provided mount command-line options into the 4th & + * 5th arguments to mount(2). Output parameter "@flags" gets the + * standard options (indicated by MS_ bits), and output parameter + * "@extra_opts" gets all the filesystem-specific options. + */ +static void parse_opts(const char *options, int *flags, char **extra_opts) { if (options != NULL) { char *opts = xstrdup(options); - char *opt; - int len = strlen(opts) + 20; + char *opt, *p; + int len = strlen(opts) + 1; /* include room for a null */ + int open_quote = 0; *extra_opts = xmalloc(len); **extra_opts = '\0'; - for (opt = strtok(opts, ","); opt; opt = strtok(NULL, ",")) - parse_opt(opt, flags, *extra_opts, len); - + for (p = opts, opt = NULL; p && *p; p++) { + if (!opt) + opt = p; /* begin of the option item */ + if (*p == '"') + open_quote ^= 1; /* reverse the status */ + if (open_quote) + continue; /* still in a quoted block */ + if (*p == ',') + *p = '\0'; /* terminate the option item */ + + /* end of option item or last item */ + if (*p == '\0' || *(p + 1) == '\0') { + parse_opt(opt, flags, *extra_opts, len); + opt = NULL; + } + } free(opts); } +} + +static int chk_mountpoint(char *mount_point) +{ + struct stat sb; + if (stat(mount_point, &sb) < 0){ + mount_error(NULL, mount_point, errno); + return 1; + } + if (S_ISDIR(sb.st_mode) == 0){ + mount_error(NULL, mount_point, ENOTDIR); + return 1; + } + if (access(mount_point, X_OK) < 0) { + mount_error(NULL, mount_point, errno); + return 1; + } + + return 0; } -static void mount_error(char *node) +static int try_mount(char *spec, char *mount_point, int flags, + char *fs_type, char **extra_opts, char *mount_opts, + int fake, int nomtab, int bg) { - switch(errno) { - case ENOTDIR: - printf("%s: mount point %s is not a directory\n", progname, node); - break; - case EBUSY: - printf("%s: %s is already mounted or busy\n", progname, node); - break; - case ENOENT: - printf("%s: mount point %s does not exist\n", progname, node); - break; - default: - printf("%s: %s\n", progname, strerror(errno)); + int ret; + + if (string) + ret = nfsmount_string(spec, mount_point, fs_type, flags, + extra_opts, fake, bg); + else { + if (strcmp(fs_type, "nfs4") == 0) + ret = nfs4mount(spec, mount_point, flags, + extra_opts, fake, bg); + else + ret = nfsmount(spec, mount_point, flags, + extra_opts, fake, bg); } + + if (ret) + return ret; + + if (!fake) + print_one(spec, mount_point, fs_type, mount_opts); + + if (!nomtab) + ret = add_mtab(spec, mount_point, fs_type, flags, *extra_opts, + 0, 0 /* these are always zero for NFS */ ); + return ret; } int main(int argc, char *argv[]) { - int c, flags = 0, nfs_mount_vers = 0, mnt_err = 1, fake = 0; - char *spec, *mount_point, *extra_opts = NULL; - char *mount_opts = NULL, *p; + int c, flags = 0, mnt_err = 1, fake = 0; + char *spec, *mount_point, *fs_type = "nfs"; + char *extra_opts = NULL, *mount_opts = NULL; + uid_t uid = getuid(); - progname = argv[0]; - if ((p = strrchr(progname, '/')) != NULL) - progname = p+1; + progname = basename(argv[0]); - if (getuid() != 0) { - printf("%s: only root can do that.\n", progname); - exit(1); - } - - if(!strncmp(progname, "umount", strlen("umount"))) { - if(argc < 2) { - umount_usage(); - exit(1); - } - return(nfsumount(argc, argv)); - } + discover_nfs_mount_data_version(); - if ((argc < 2)) { - mount_usage(); - exit(1); - } + if(!strncmp(progname, "umount", strlen("umount"))) + exit(nfsumount(argc, argv)); - if(argv[1][0] == '-') { + if (argv[1] && argv[1][0] == '-') { if(argv[1][1] == 'V') printf("%s ("PACKAGE_STRING")\n", progname); else mount_usage(); - return 0; + exit(EX_SUCCESS); } - while ((c = getopt_long (argc - 2, argv + 2, "rt:vVwfno:h", + if ((argc < 3)) { + mount_usage(); + exit(EX_USAGE); + } + + spec = argv[1]; + mount_point = argv[2]; + + argv[2] = argv[0]; /* so that getopt error messages are correct */ + while ((c = getopt_long(argc - 2, argv + 2, "rvVwfno:hs", longopts, NULL)) != -1) { switch (c) { case 'r': flags |= MS_RDONLY; break; - case 't': - nfs_mount_vers = (strncmp(optarg, "nfs4", 4)) ? 0 : 4; - break; case 'v': ++verbose; break; case 'V': printf("%s: ("PACKAGE_STRING")\n", progname); - return 0; + exit(EX_SUCCESS); case 'w': flags &= ~MS_RDONLY; break; @@ -325,63 +459,111 @@ int main(int argc, char *argv[]) else mount_opts = xstrdup(optarg); break; - case 128: /* bind */ - mounttype = MS_BIND; - break; - case 129: /* replace */ - mounttype = MS_REPLACE; - break; - case 130: /* after */ - mounttype = MS_AFTER; - break; - case 131: /* before */ - mounttype = MS_BEFORE; - break; - case 132: /* over */ - mounttype = MS_OVER; - break; - case 133: /* move */ - mounttype = MS_MOVE; - break; - case 135: /* rbind */ - mounttype = MS_BIND | MS_REC; + case 's': + ++sloppy; break; case 'h': default: mount_usage(); - exit(1); + goto out_usage; } } - spec = argv[1]; - mount_point = canonicalize(argv[2]); - - parse_opts(mount_opts, &flags, &extra_opts); + /* + * Extra non-option words at the end are bogus... + */ + if (optind != argc - 2) { + mount_usage(); + goto out_usage; + } + + if (strcmp(progname, "mount.nfs4") == 0) + fs_type = "nfs4"; + + /* + * If a non-root user is attempting to mount, make sure the + * user's requested options match the options specified in + * /etc/fstab; otherwise, don't allow the mount. + */ + if (uid != 0) { + struct mntentchn *mc; + + if ((mc = getfsfile(mount_point)) == NULL || + strcmp(mc->m.mnt_fsname, spec) != 0 || + strcmp(mc->m.mnt_type, fs_type) != 0) { + nfs_error(_("%s: permission denied: no match for %s " + "found in /etc/fstab"), progname, mount_point); + goto out_usage; + } - if (!strcmp(progname, "mount.nfs4") || nfs_mount_vers == 4) { - nfs_mount_vers = 4; - mnt_err = nfs4mount(spec, mount_point, &flags, &extra_opts, &mount_opts, 0); + /* + * 'mount' munges the options from fstab before passing them + * to us, so it is non-trivial to test that we have the correct + * set of options and we don't want to trust what the user + * gave us, so just take whatever is in /etc/fstab. + */ + mount_opts = strdup(mc->m.mnt_opts); } - else { - if (!strcmp(progname, "mount.nfs")) { - mnt_err = nfsmount(spec, mount_point, &flags, - &extra_opts, &mount_opts, &nfs_mount_vers, 0); + + mount_point = canonicalize(mount_point); + if (!mount_point) { + nfs_error(_("%s: no mount point provided"), progname); + goto out_usage; + } + if (mount_point[0] != '/') { + nfs_error(_("%s: unrecognized mount point %s"), + progname, mount_point); + mnt_err = EX_USAGE; + goto out; + } + + parse_opts(mount_opts, &flags, &extra_opts); + + if (uid != 0) { + if (!(flags & (MS_USERS|MS_USER))) { + nfs_error(_("%s: permission denied"), progname); + mnt_err = EX_USAGE; + goto out; } } - if (!mnt_err && !fake) { - mnt_err = do_mount_syscall(spec, mount_point, nfs_mount_vers == 4 ? "nfs4" : "nfs", flags, mount_opts); - - if(mnt_err) { - mount_error(mount_point); - exit(-1); + if (chk_mountpoint(mount_point)) { + mnt_err = EX_USAGE; + goto out; + } + + mnt_err = try_mount(spec, mount_point, flags, fs_type, &extra_opts, + mount_opts, fake, nomtab, FOREGROUND); + if (mnt_err == EX_BG) { + printf(_("%s: backgrounding \"%s\"\n"), + progname, spec); + fflush(stdout); + + /* + * Parent exits immediately with success. + */ + if (daemon(0, 0)) { + nfs_error(_("%s: failed to start " + "background process: %s\n"), + progname, strerror(errno)); + exit(EX_FAIL); } - if(!nomtab) - add_mtab(spec, mount_point, nfs_mount_vers == 4 ? "nfs4" : "nfs", - flags, extra_opts, 0, 0); + mnt_err = try_mount(spec, mount_point, flags, fs_type, + &extra_opts, mount_opts, fake, + nomtab, BACKGROUND); + if (verbose && mnt_err) + printf(_("%s: giving up \"%s\"\n"), + progname, spec); } - return 0; -} +out: + free(mount_opts); + free(extra_opts); + free(mount_point); + exit(mnt_err); +out_usage: + free(mount_opts); + exit(EX_USAGE); +}