X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fmount.c;h=487c0a62bc20f5d7edf02a72334423c1ee30702a;hp=ca87e3d1b7fb60bc04d7e3504a7bcb4985e79b38;hb=6facb22402a0bd8cd49be2ed1a0856b24fef42f4;hpb=940c7c304d4a43c00c27529cdddc7c87db6eef87 diff --git a/utils/mount/mount.c b/utils/mount/mount.c index ca87e3d..487c0a6 100644 --- a/utils/mount/mount.c +++ b/utils/mount/mount.c @@ -28,6 +28,7 @@ #include #include #include +#include #include "fstab.h" #include "xcommon.h" @@ -43,6 +44,7 @@ char *progname; int nomtab; int verbose; int mounttype; +int sloppy; static struct option longopts[] = { { "fake", 0, 0, 'f' }, @@ -74,6 +76,11 @@ struct opt_map { int mask; /* flag mask value */ }; +/* Custom mount options for our own purposes. */ +#define MS_DUMMY 0x00000000 +#define MS_USERS 0x40000000 +#define MS_USER 0x80000000 + static const struct opt_map opt_map[] = { { "defaults", 0, 0, 0 }, /* default options */ { "ro", 1, 0, MS_RDONLY }, /* read-only */ @@ -90,6 +97,20 @@ 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|MS_NOEXEC|MS_NOSUID|MS_NODEV }, + /* Allow ordinary user to mount */ + { "nousers", 0, 1, MS_DUMMY }, /* Forbid ordinary user to mount */ + { "user", 1, 0, MS_USER|MS_NOEXEC|MS_NOSUID|MS_NODEV }, + /* 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 +125,7 @@ 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 */ @@ -121,6 +143,15 @@ static char * fix_opts_string (int flags, const char *extra_opts) { 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; @@ -139,7 +170,6 @@ static char * fix_opts_string (int flags, const char *extra_opts) { int add_mtab(char *fsname, char *mount_point, char *fstype, int flags, char *opts, int freq, int passno) { struct mntent ment; - int fd; FILE *mtab; ment.mnt_fsname = fsname; @@ -149,11 +179,12 @@ int add_mtab(char *fsname, char *mount_point, char *fstype, int flags, char *opt ment.mnt_freq = 0; ment.mnt_passno= 0; - 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); + return 0; } - close(fd); + + lock_mtab(); if ((mtab = setmntent(MOUNTED, "a+")) == NULL) { fprintf(stderr, "Can't open " MOUNTED); @@ -161,21 +192,22 @@ int add_mtab(char *fsname, char *mount_point, char *fstype, int flags, char *opt } if (addmntent(mtab, &ment) == 1) { + endmntent(mtab); + unlock_mtab(); fprintf(stderr, "Can't write mount entry"); return 1; } if (fchmod(fileno(mtab), 0644) == -1) { + endmntent(mtab); + unlock_mtab(); fprintf(stderr, "Can't set perms on " MOUNTED); return 1; } endmntent(mtab); - if (unlink(MOUNTED"~") == -1) { - fprintf(stderr, "Can't remove "MOUNTED"~"); - return 1; - } + unlock_mtab(); return 0; } @@ -194,6 +226,7 @@ void mount_usage() 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-s\t\tTolerate sloppy mount options rather than failing.\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"); @@ -228,66 +261,92 @@ 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); + 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 void mount_error(char *node) { switch(errno) { case ENOTDIR: - printf("%s: mount point %s is not a directory\n", progname, node); + fprintf(stderr, "%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); + fprintf(stderr, "%s: %s is already mounted or busy\n", progname, node); break; case ENOENT: - printf("%s: mount point %s does not exist\n", progname, node); + fprintf(stderr, "%s: mount point %s does not exist\n", progname, node); break; default: - printf("%s: %s\n", progname, strerror(errno)); + fprintf(stderr, "%s: %s\n", progname, strerror(errno)); } } +static void start_statd() +{ + /* If /var/run/rpc.statd.pid exists and is non-empty, + * assume statd already running. + * If START_STATD not defined, or defined to a non-existent file, + * don't bother, + * else run that file (typically a shell script) + */ + struct stat stb; + if (stat("/var/run/rpc.statd.pid", &stb) == 0 && + stb.st_size > 0) + return; +#ifdef START_STATD + if (stat(START_STATD, &stb) ==0 && + S_ISREG(stb.st_mode) && + (stb.st_mode & S_IXUSR)) + system(START_STATD); +#endif +} + 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; + uid_t uid = getuid(); progname = argv[0]; + if (!progname) + exit(2); + if ((p = strrchr(progname, '/')) != NULL) progname = p+1; - 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)); + exit(nfsumount(argc, argv) ? 0 : 1); } - if ((argc < 2)) { - mount_usage(); - exit(1); - } - - if(argv[1][0] == '-') { + if(argv[1] && argv[1][0] == '-') { if(argv[1][1] == 'V') printf("%s ("PACKAGE_STRING")\n", progname); else @@ -295,14 +354,31 @@ int main(int argc, char *argv[]) return 0; } - while ((c = getopt_long (argc - 2, argv + 2, "rt:vVwfno:h", + if ((argc < 3)) { + mount_usage(); + exit(1); + } + + 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, "rt:vVwfno:hs", longopts, NULL)) != -1) { switch (c) { case 'r': flags |= MS_RDONLY; break; case 't': - nfs_mount_vers = (strncmp(optarg, "nfs4", 4)) ? 0 : 4; + if (strcmp(optarg, "nfs4") == 0) + nfs_mount_vers = 4; + else if (strcmp(optarg, "nfs") == 0) + nfs_mount_vers = 0; + else { + fprintf(stderr, "%s: unknown filesystem type: %s\n", + progname, optarg); + exit(1); + } break; case 'v': ++verbose; @@ -325,6 +401,9 @@ int main(int argc, char *argv[]) else mount_opts = xstrdup(optarg); break; + case 's': + ++sloppy; + break; case 128: /* bind */ mounttype = MS_BIND; break; @@ -352,36 +431,86 @@ int main(int argc, char *argv[]) exit(1); } } + if (optind != argc-2) { + /* Extra non-option words at the end... */ + mount_usage(); + exit(1); + } - spec = argv[1]; - mount_point = canonicalize(argv[2]); + if (strcmp(progname, "mount.nfsv4") == 0) + nfs_mount_vers = 4; + + if (uid != 0) { + /* don't even think about it unless options exactly + * match fstab + */ + struct mntentchn *mc; + + if ((mc = getfsfile(mount_point)) == NULL || + strcmp(mc->m.mnt_fsname, spec) != 0 || + strcmp(mc->m.mnt_type, (nfs_mount_vers == 4 ? "nfs4":"nfs")) != 0 + ) { + fprintf(stderr, "%s: permission died - no match for fstab\n", + progname); + exit(1); + } + /* '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 fstab + */ + mount_opts = strdup(mc->m.mnt_opts); + mounttype = 0; + } + + mount_point = canonicalize(mount_point); + if (mount_point == NULL || + mount_point[0] != '/') { + fprintf(stderr, "%s: unknown mount point %s\n", + progname, mount_point ? : ""); + exit(1); + } parse_opts(mount_opts, &flags, &extra_opts); - 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); + if (uid != 0) { + if (! (flags & (MS_USERS | MS_USER))) { + fprintf(stderr, "%s: permission denied\n", progname); + exit(1); + } } + + if (nfs_mount_vers == 4) + mnt_err = nfs4mount(spec, mount_point, &flags, &extra_opts, &mount_opts, 0); else { - if (!strcmp(progname, "mount.nfs")) { - mnt_err = nfsmount(spec, mount_point, &flags, - &extra_opts, &mount_opts, &nfs_mount_vers, 0); - } + int need_statd = 0; + mnt_err = nfsmount(spec, mount_point, &flags, + &extra_opts, &mount_opts, + 0, &need_statd); + if (!mnt_err && !fake && need_statd) + start_statd(); } - if (!mnt_err && !fake) { - mnt_err = do_mount_syscall(spec, mount_point, nfs_mount_vers == 4 ? "nfs4" : "nfs", flags, mount_opts); - - if(mnt_err) { + if (mnt_err) + exit(EX_FAIL); + + if (!fake) { + mnt_err = do_mount_syscall(spec, mount_point, + nfs_mount_vers == 4 ? "nfs4" : "nfs", + flags & ~(MS_USER|MS_USERS) , + mount_opts); + + if (mnt_err) { mount_error(mount_point); - exit(-1); + exit(EX_FAIL); } - - if(!nomtab) - add_mtab(spec, mount_point, nfs_mount_vers == 4 ? "nfs4" : "nfs", - flags, extra_opts, 0, 0); } + if (!nomtab) + add_mtab(spec, mount_point, + nfs_mount_vers == 4 ? "nfs4" : "nfs", + flags, extra_opts, 0, 0); + return 0; }