diff options
Diffstat (limited to 'util-linux/mount.c')
| -rw-r--r-- | util-linux/mount.c | 1712 |
1 files changed, 1712 insertions, 0 deletions
diff --git a/util-linux/mount.c b/util-linux/mount.c new file mode 100644 index 0000000..f8ae1df --- /dev/null +++ b/util-linux/mount.c @@ -0,0 +1,1712 @@ +/* vi: set sw=4 ts=4: */ +/* + * Mini mount implementation for busybox + * + * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. + * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> + * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net> + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + */ + +/* Design notes: There is no spec for mount. Remind me to write one. + + mount_main() calls singlemount() which calls mount_it_now(). + + mount_main() can loop through /etc/fstab for mount -a + singlemount() can loop through /etc/filesystems for fstype detection. + mount_it_now() does the actual mount. +*/ + +#include "busybox.h" +#include <mntent.h> + +/* Needed for nfs support only... */ +#include <syslog.h> +#include <sys/utsname.h> +#undef TRUE +#undef FALSE +#include <rpc/rpc.h> +#include <rpc/pmap_prot.h> +#include <rpc/pmap_clnt.h> + + +// Not real flags, but we want to be able to check for this. +enum { + MOUNT_USERS = (1<<28)*ENABLE_DESKTOP, + MOUNT_NOAUTO = (1<<29), + MOUNT_SWAP = (1<<30), +}; +// TODO: more "user" flag compatibility. +// "user" option (from mount manpage): +// Only the user that mounted a filesystem can unmount it again. +// If any user should be able to unmount, then use users instead of user +// in the fstab line. The owner option is similar to the user option, +// with the restriction that the user must be the owner of the special file. +// This may be useful e.g. for /dev/fd if a login script makes +// the console user owner of this device. + +/* Standard mount options (from -o options or --options), with corresponding + * flags */ + +struct { + char *name; + long flags; +} static mount_options[] = { + // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. + + USE_FEATURE_MOUNT_LOOP( + {"loop", 0}, + ) + + USE_FEATURE_MOUNT_FSTAB( + {"defaults", 0}, + /* {"quiet", 0}, - do not filter out, vfat wants to see it */ + {"noauto", MOUNT_NOAUTO}, + {"swap", MOUNT_SWAP}, + USE_DESKTOP({"user", MOUNT_USERS},) + USE_DESKTOP({"users", MOUNT_USERS},) + ) + + USE_FEATURE_MOUNT_FLAGS( + // vfs flags + {"nosuid", MS_NOSUID}, + {"suid", ~MS_NOSUID}, + {"dev", ~MS_NODEV}, + {"nodev", MS_NODEV}, + {"exec", ~MS_NOEXEC}, + {"noexec", MS_NOEXEC}, + {"sync", MS_SYNCHRONOUS}, + {"async", ~MS_SYNCHRONOUS}, + {"atime", ~MS_NOATIME}, + {"noatime", MS_NOATIME}, + {"diratime", ~MS_NODIRATIME}, + {"nodiratime", MS_NODIRATIME}, + {"loud", ~MS_SILENT}, + + // action flags + + {"bind", MS_BIND}, + {"move", MS_MOVE}, + {"shared", MS_SHARED}, + {"slave", MS_SLAVE}, + {"private", MS_PRIVATE}, + {"unbindable", MS_UNBINDABLE}, + {"rshared", MS_SHARED|MS_RECURSIVE}, + {"rslave", MS_SLAVE|MS_RECURSIVE}, + {"rprivate", MS_SLAVE|MS_RECURSIVE}, + {"runbindable", MS_UNBINDABLE|MS_RECURSIVE}, + ) + + // Always understood. + + {"ro", MS_RDONLY}, // vfs flag + {"rw", ~MS_RDONLY}, // vfs flag + {"remount", MS_REMOUNT}, // action flag +}; + +#define VECTOR_SIZE(v) (sizeof(v) / sizeof((v)[0])) + +/* Append mount options to string */ +static void append_mount_options(char **oldopts, char *newopts) +{ + if (*oldopts && **oldopts) { + /* do not insert options which are already there */ + while (newopts[0]) { + char *p; + int len = strlen(newopts); + p = strchr(newopts, ','); + if (p) len = p - newopts; + p = *oldopts; + while (1) { + if (!strncmp(p, newopts, len) + && (p[len]==',' || p[len]==0)) + goto skip; + p = strchr(p,','); + if(!p) break; + p++; + } + p = xasprintf("%s,%.*s", *oldopts, len, newopts); + free(*oldopts); + *oldopts = p; +skip: + newopts += len; + while (newopts[0] == ',') newopts++; + } + } else { + if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts); + *oldopts = xstrdup(newopts); + } +} + +/* Use the mount_options list to parse options into flags. + * Also return list of unrecognized options if unrecognized!=NULL */ +static int parse_mount_options(char *options, char **unrecognized) +{ + int flags = MS_SILENT; + + // Loop through options + for (;;) { + int i; + char *comma = strchr(options, ','); + + if (comma) *comma = 0; + + // Find this option in mount_options + for (i = 0; i < VECTOR_SIZE(mount_options); i++) { + if (!strcasecmp(mount_options[i].name, options)) { + long fl = mount_options[i].flags; + if (fl < 0) flags &= fl; + else flags |= fl; + break; + } + } + // If unrecognized not NULL, append unrecognized mount options */ + if (unrecognized && i == VECTOR_SIZE(mount_options)) { + // Add it to strflags, to pass on to kernel + i = *unrecognized ? strlen(*unrecognized) : 0; + *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2); + + // Comma separated if it's not the first one + if (i) (*unrecognized)[i++] = ','; + strcpy((*unrecognized)+i, options); + } + + // Advance to next option, or finish + if (comma) { + *comma = ','; + options = ++comma; + } else break; + } + + return flags; +} + +// Return a list of all block device backed filesystems + +static llist_t *get_block_backed_filesystems(void) +{ + static const char *const filesystems[] = { + "/etc/filesystems", + "/proc/filesystems", + 0 + }; + char *fs, *buf; + llist_t *list = 0; + int i; + FILE *f; + + for (i = 0; filesystems[i]; i++) { + f = fopen(filesystems[i], "r"); + if (!f) continue; + + while ((buf = xmalloc_getline(f)) != 0) { + if (!strncmp(buf, "nodev", 5) && isspace(buf[5])) + continue; + fs = skip_whitespace(buf); + if (*fs=='#' || *fs=='*' || !*fs) continue; + + llist_add_to_end(&list, xstrdup(fs)); + free(buf); + } + if (ENABLE_FEATURE_CLEAN_UP) fclose(f); + } + + return list; +} + +llist_t *fslist = 0; + +#if ENABLE_FEATURE_CLEAN_UP +static void delete_block_backed_filesystems(void) +{ + llist_free(fslist, free); +} +#else +void delete_block_backed_filesystems(void); +#endif + +#if ENABLE_FEATURE_MTAB_SUPPORT +static int useMtab = 1; +static int fakeIt; +#else +#define useMtab 0 +#define fakeIt 0 +#endif + +// Perform actual mount of specific filesystem at specific location. +// NB: mp->xxx fields may be trashed on exit +static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts) +{ + int rc = 0; + + if (fakeIt) goto mtab; + + // Mount, with fallback to read-only if necessary. + + for (;;) { + rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, + vfsflags, filteropts); + if (!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS)) + break; + bb_error_msg("%s is write-protected, mounting read-only", + mp->mnt_fsname); + vfsflags |= MS_RDONLY; + } + + // Abort entirely if permission denied. + + if (rc && errno == EPERM) + bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); + + /* If the mount was successful, and we're maintaining an old-style + * mtab file by hand, add the new entry to it now. */ + mtab: + if (ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc && !(vfsflags & MS_REMOUNT)) { + char *fsname; + FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); + int i; + + if (!mountTable) { + bb_error_msg("no %s",bb_path_mtab_file); + goto ret; + } + + // Add vfs string flags + + for (i=0; mount_options[i].flags != MS_REMOUNT; i++) + if (mount_options[i].flags > 0 && (mount_options[i].flags & vfsflags)) + append_mount_options(&(mp->mnt_opts), mount_options[i].name); + + // Remove trailing / (if any) from directory we mounted on + + i = strlen(mp->mnt_dir) - 1; + if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = 0; + + // Convert to canonical pathnames as needed + + mp->mnt_dir = bb_simplify_path(mp->mnt_dir); + fsname = 0; + if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */ + mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname); + mp->mnt_type = "bind"; + } + mp->mnt_freq = mp->mnt_passno = 0; + + // Write and close. + + addmntent(mountTable, mp); + endmntent(mountTable); + if (ENABLE_FEATURE_CLEAN_UP) { + free(mp->mnt_dir); + free(fsname); + } + } + ret: + return rc; +} + +#if ENABLE_FEATURE_MOUNT_NFS + +/* + * Linux NFS mount + * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> + * + * Licensed under GPLv2, see file LICENSE in this tarball for details. + * + * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port + * numbers to be specified on the command line. + * + * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>: + * Omit the call to connect() for Linux version 1.3.11 or later. + * + * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com> + * Implemented the "bg", "fg" and "retry" mount options for NFS. + * + * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org> + * - added Native Language Support + * + * Modified by Olaf Kirch and Trond Myklebust for new NFS code, + * plus NFSv3 stuff. + */ + +/* This is just a warning of a common mistake. Possibly this should be a + * uclibc faq entry rather than in busybox... */ +#if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__) +#error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support." +#endif + +#define MOUNTPORT 635 +#define MNTPATHLEN 1024 +#define MNTNAMLEN 255 +#define FHSIZE 32 +#define FHSIZE3 64 + +typedef char fhandle[FHSIZE]; + +typedef struct { + unsigned int fhandle3_len; + char *fhandle3_val; +} fhandle3; + +enum mountstat3 { + MNT_OK = 0, + MNT3ERR_PERM = 1, + MNT3ERR_NOENT = 2, + MNT3ERR_IO = 5, + MNT3ERR_ACCES = 13, + MNT3ERR_NOTDIR = 20, + MNT3ERR_INVAL = 22, + MNT3ERR_NAMETOOLONG = 63, + MNT3ERR_NOTSUPP = 10004, + MNT3ERR_SERVERFAULT = 10006, +}; +typedef enum mountstat3 mountstat3; + +struct fhstatus { + unsigned int fhs_status; + union { + fhandle fhs_fhandle; + } fhstatus_u; +}; +typedef struct fhstatus fhstatus; + +struct mountres3_ok { + fhandle3 fhandle; + struct { + unsigned int auth_flavours_len; + char *auth_flavours_val; + } auth_flavours; +}; +typedef struct mountres3_ok mountres3_ok; + +struct mountres3 { + mountstat3 fhs_status; + union { + mountres3_ok mountinfo; + } mountres3_u; +}; +typedef struct mountres3 mountres3; + +typedef char *dirpath; + +typedef char *name; + +typedef struct mountbody *mountlist; + +struct mountbody { + name ml_hostname; + dirpath ml_directory; + mountlist ml_next; +}; +typedef struct mountbody mountbody; + +typedef struct groupnode *groups; + +struct groupnode { + name gr_name; + groups gr_next; +}; +typedef struct groupnode groupnode; + +typedef struct exportnode *exports; + +struct exportnode { + dirpath ex_dir; + groups ex_groups; + exports ex_next; +}; +typedef struct exportnode exportnode; + +struct ppathcnf { + int pc_link_max; + short pc_max_canon; + short pc_max_input; + short pc_name_max; + short pc_path_max; + short pc_pipe_buf; + u_char pc_vdisable; + char pc_xxx; + short pc_mask[2]; +}; +typedef struct ppathcnf ppathcnf; + +#define MOUNTPROG 100005 +#define MOUNTVERS 1 + +#define MOUNTPROC_NULL 0 +#define MOUNTPROC_MNT 1 +#define MOUNTPROC_DUMP 2 +#define MOUNTPROC_UMNT 3 +#define MOUNTPROC_UMNTALL 4 +#define MOUNTPROC_EXPORT 5 +#define MOUNTPROC_EXPORTALL 6 + +#define MOUNTVERS_POSIX 2 + +#define MOUNTPROC_PATHCONF 7 + +#define MOUNT_V3 3 + +#define MOUNTPROC3_NULL 0 +#define MOUNTPROC3_MNT 1 +#define MOUNTPROC3_DUMP 2 +#define MOUNTPROC3_UMNT 3 +#define MOUNTPROC3_UMNTALL 4 +#define MOUNTPROC3_EXPORT 5 + +enum { +#ifndef NFS_FHSIZE + NFS_FHSIZE = 32, +#endif +#ifndef NFS_PORT + NFS_PORT = 2049 +#endif +}; + +/* + * We want to be able to compile mount on old kernels in such a way + * that the binary will work well on more recent kernels. + * Thus, if necessary we teach nfsmount.c the structure of new fields + * that will come later. + * + * Moreover, the new kernel includes conflict with glibc includes + * so it is easiest to ignore the kernel altogether (at compile time). + */ + +struct nfs2_fh { + char data[32]; +}; +struct nfs3_fh { + unsigned short size; + unsigned char data[64]; +}; + +struct nfs_mount_data { + int version; /* 1 */ + int fd; /* 1 */ + struct nfs2_fh old_root; /* 1 */ + int flags; /* 1 */ + int rsize; /* 1 */ + int wsize; /* 1 */ + int timeo; /* 1 */ + int retrans; /* 1 */ + int acregmin; /* 1 */ + int acregmax; /* 1 */ + int acdirmin; /* 1 */ + int acdirmax; /* 1 */ + struct sockaddr_in addr; /* 1 */ + char hostname[256]; /* 1 */ + int namlen; /* 2 */ + unsigned int bsize; /* 3 */ + struct nfs3_fh root; /* 4 */ +}; + +/* bits in the flags field */ +enum { + NFS_MOUNT_SOFT = 0x0001, /* 1 */ + NFS_MOUNT_INTR = 0x0002, /* 1 */ + NFS_MOUNT_SECURE = 0x0004, /* 1 */ + NFS_MOUNT_POSIX = 0x0008, /* 1 */ + NFS_MOUNT_NOCTO = 0x0010, /* 1 */ + NFS_MOUNT_NOAC = 0x0020, /* 1 */ + NFS_MOUNT_TCP = 0x0040, /* 2 */ + NFS_MOUNT_VER3 = 0x0080, /* 3 */ + NFS_MOUNT_KERBEROS = 0x0100, /* 3 */ + NFS_MOUNT_NONLM = 0x0200 /* 3 */ +}; + + +/* + * We need to translate between nfs status return values and + * the local errno values which may not be the same. + * + * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno: + * "after #include <errno.h> the symbol errno is reserved for any use, + * it cannot even be used as a struct tag or field name". + */ + +#ifndef EDQUOT +#define EDQUOT ENOSPC +#endif + +// Convert each NFSERR_BLAH into EBLAH + +static const struct { + int stat; + int errnum; +} nfs_errtbl[] = { + {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST}, + {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG}, + {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT}, + {70,ESTALE}, {71,EREMOTE}, {-1,EIO} +}; + +static char *nfs_strerror(int status) +{ + int i; + static char buf[sizeof("unknown nfs status return value: ") + sizeof(int)*3]; + + for (i = 0; nfs_errtbl[i].stat != -1; i++) { + if (nfs_errtbl[i].stat == status) + return strerror(nfs_errtbl[i].errnum); + } + sprintf(buf, "unknown nfs status return value: %d", status); + return buf; +} + +static bool_t xdr_fhandle(XDR *xdrs, fhandle objp) +{ + if (!xdr_opaque(xdrs, objp, FHSIZE)) + return FALSE; + return TRUE; +} + +static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp) +{ + if (!xdr_u_int(xdrs, &objp->fhs_status)) + return FALSE; + switch (objp->fhs_status) { + case 0: + if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle)) + return FALSE; + break; + default: + break; + } + return TRUE; +} + +static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp) +{ + if (!xdr_string(xdrs, objp, MNTPATHLEN)) + return FALSE; + return TRUE; +} + +static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp) +{ + if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3)) + return FALSE; + return TRUE; +} + +static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp) +{ + if (!xdr_fhandle3(xdrs, &objp->fhandle)) + return FALSE; + if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0, + sizeof (int), (xdrproc_t) xdr_int)) + return FALSE; + return TRUE; +} + +static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp) +{ + if (!xdr_enum(xdrs, (enum_t *) objp)) + return FALSE; + return TRUE; +} + +static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp) +{ + if (!xdr_mountstat3(xdrs, &objp->fhs_status)) + return FALSE; + switch (objp->fhs_status) { + case MNT_OK: + if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo)) + return FALSE; + break; + default: + break; + } + return TRUE; +} + +#define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) + +/* + * nfs_mount_version according to the sources seen at compile time. + */ +static int nfs_mount_version; +static int kernel_version; + +/* + * 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: + * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time + * NFS_MOUNT_VERSION: these nfsmount sources at compile time + * nfs_mount_version: version this source and running kernel can handle + */ +static void +find_kernel_nfs_mount_version(void) +{ + if (kernel_version) + return; + + nfs_mount_version = 4; /* default */ + + kernel_version = get_linux_version_code(); + if (kernel_version) { + if (kernel_version < KERNEL_VERSION(2,1,32)) + nfs_mount_version = 1; + else if (kernel_version < KERNEL_VERSION(2,2,18) || + (kernel_version >= KERNEL_VERSION(2,3,0) && + kernel_version < KERNEL_VERSION(2,3,99))) + nfs_mount_version = 3; + /* else v4 since 2.3.99pre4 */ + } +} + +static struct pmap * +get_mountport(struct sockaddr_in *server_addr, + long unsigned prog, + long unsigned version, + long unsigned proto, + long unsigned port) +{ + struct pmaplist *pmap; + static struct pmap p = {0, 0, 0, 0}; + + server_addr->sin_port = PMAPPORT; + pmap = pmap_getmaps(server_addr); + + 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; + + 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_port) + p.pm_port = MOUNTPORT; + if (!p.pm_prot) + p.pm_prot = IPPROTO_TCP; + return &p; +} + +static int daemonize(void) +{ + int fd; + int pid = fork(); + if (pid < 0) /* error */ + return -errno; + if (pid > 0) /* parent */ + return 0; + /* child */ + fd = xopen(bb_dev_null, O_RDWR); + dup2(fd, 0); + dup2(fd, 1); + dup2(fd, 2); + if (fd > 2) close(fd); + setsid(); + openlog(applet_name, LOG_PID, LOG_DAEMON); + logmode = LOGMODE_SYSLOG; + return 1; +} + +// TODO +static inline int we_saw_this_host_before(const char *hostname) +{ + return 0; +} + +/* RPC strerror analogs are terminally idiotic: + * *mandatory* prefix and \n at end. + * This hopefully helps. Usage: + * error_msg_rpc(clnt_*error*(" ")) */ +static void error_msg_rpc(const char *msg) +{ + int len; + while (msg[0] == ' ' || msg[0] == ':') msg++; + len = strlen(msg); + while (len && msg[len-1] == '\n') len--; + bb_error_msg("%.*s", len, msg); +} + +// NB: mp->xxx fields may be trashed on exit +static int nfsmount(struct mntent *mp, int vfsflags, char *filteropts) +{ + CLIENT *mclient; + char *hostname; + char *pathname; + char *mounthost; + struct nfs_mount_data data; + char *opt; + struct hostent *hp; + struct sockaddr_in server_addr; + struct sockaddr_in mount_server_addr; + int msock, fsock; + union { + struct fhstatus nfsv2; + struct mountres3 nfsv3; + } status; + int daemonized; + char *s; + int port; + int mountport; + int proto; + int bg; + int soft; + int intr; + int posix; + int nocto; + int noac; + int nolock; + int retry; + int tcp; + int mountprog; + int mountvers; + int nfsprog; + int nfsvers; + int retval; + + find_kernel_nfs_mount_version(); + + daemonized = 0; + mounthost = NULL; + retval = ETIMEDOUT; + msock = fsock = -1; + mclient = NULL; + + /* NB: hostname, mounthost, filteropts must be free()d prior to return */ + + filteropts = xstrdup(filteropts); /* going to trash it later... */ + + hostname = xstrdup(mp->mnt_fsname); + /* mount_main() guarantees that ':' is there */ + s = strchr(hostname, ':'); + pathname = s + 1; + *s = '\0'; + /* Ignore all but first hostname in replicated mounts + until they can be fully supported. (mack@sgi.com) */ + s = strchr(hostname, ','); + if (s) { + *s = '\0'; + bb_error_msg("warning: multiple hostnames not supported"); + } + + server_addr.sin_family = AF_INET; + if (!inet_aton(hostname, &server_addr.sin_addr)) { + hp = gethostbyname(hostname); + if (hp == NULL) { + bb_herror_msg("%s", hostname); + goto fail; + } + if (hp->h_length > sizeof(struct in_addr)) { + bb_error_msg("got bad hp->h_length"); + 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 */ + + if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */ + mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr)); + } else { + char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts, + mp->mnt_opts[0] ? "," : "", + inet_ntoa(server_addr.sin_addr)); + free(mp->mnt_opts); + mp->mnt_opts = tmp; + } + + /* 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; + data.namlen = NAME_MAX; + + bg = 0; + soft = 0; + intr = 0; + posix = 0; + nocto = 0; + nolock = 0; + noac = 0; + retry = 10000; /* 10000 minutes ~ 1 week */ + tcp = 0; + + mountprog = MOUNTPROG; + mountvers = 0; + port = 0; + mountport = 0; + nfsprog = 100003; + nfsvers = 0; + + /* parse options */ + + for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) { + char *opteq = strchr(opt, '='); + if (opteq) { + const char *const options[] = { + /* 0 */ "rsize", + /* 1 */ "wsize", + /* 2 */ "timeo", + /* 3 */ "retrans", + /* 4 */ "acregmin", + /* 5 */ "acregmax", + /* 6 */ "acdirmin", + /* 7 */ "acdirmax", + /* 8 */ "actimeo", + /* 9 */ "retry", + /* 10 */ "port", + /* 11 */ "mountport", + /* 12 */ "mounthost", + /* 13 */ "mountprog", + /* 14 */ "mountvers", + /* 15 */ "nfsprog", + /* 16 */ "nfsvers", + /* 17 */ "vers", + /* 18 */ "proto", + /* 19 */ "namlen", + /* 20 */ "addr", + NULL + }; + int val = xatoi_u(opteq + 1); + *opteq = '\0'; + switch (index_in_str_array(options, opt)) { + case 0: // "rsize" + data.rsize = val; + break; + case 1: // "wsize" + data.wsize = val; + break; + case 2: // "timeo" + data.timeo = val; + break; + case 3: // "retrans" + data.retrans = val; + break; + case 4: // "acregmin" + data.acregmin = val; + break; + case 5: // "acregmax" + data.acregmax = val; + break; + case 6: // "acdirmin" + data.acdirmin = val; + break; + case 7: // "acdirmax" + data.acdirmax = val; + break; + case 8: // "actimeo" + data.acregmin = val; + data.acregmax = val; + data.acdirmin = val; + data.acdirmax = val; + break; + case 9: // "retry" + retry = val; + break; + case 10: // "port" + port = val; + break; + case 11: // "mountport" + mountport = val; + break; + case 12: // "mounthost" + mounthost = xstrndup(opteq+1, + strcspn(opteq+1," \t\n\r,")); + break; + case 13: // "mountprog" + mountprog = val; + break; + case 14: // "mountvers" + mountvers = val; + break; + case 15: // "nfsprog" + nfsprog = val; + break; + case 16: // "nfsvers" + case 17: // "vers" + nfsvers = val; + break; + case 18: // "proto" + if (!strncmp(opteq+1, "tcp", 3)) + tcp = 1; + else if (!strncmp(opteq+1, "udp", 3)) + tcp = 0; + else + bb_error_msg("warning: unrecognized proto= option"); + break; + case 19: // "namlen" + if (nfs_mount_version >= 2) + data.namlen = val; + else + bb_error_msg("warning: option namlen is not supported\n"); + break; + case 20: // "addr" - ignore + break; + default: + bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val); + goto fail; + } + } + else { + const char *const options[] = { + "bg", + "fg", + "soft", + "hard", + "intr", + "posix", + "cto", + "ac", + "tcp", + "udp", + "lock", + NULL + }; + int val = 1; + if (!strncmp(opt, "no", 2)) { + val = 0; + opt += 2; + } + switch (index_in_str_array(options, opt)) { + case 0: // "bg" + bg = val; + break; + case 1: // "fg" + bg = !val; + break; + case 2: // "soft" + soft = val; + break; + case 3: // "hard" + soft = !val; + break; + case 4: // "intr" + intr = val; + break; + case 5: // "posix" + posix = val; + break; + case 6: // "cto" + nocto = !val; + break; + case 7: // "ac" + noac = !val; + break; + case 8: // "tcp" + tcp = val; + break; + case 9: // "udp" + tcp = !val; + break; + case 10: // "lock" + if (nfs_mount_version >= 3) + nolock = !val; + else + bb_error_msg("warning: option nolock is not supported"); + break; + default: + bb_error_msg("unknown nfs mount option: %s%s", 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) + | (nocto ? NFS_MOUNT_NOCTO : 0) + | (noac ? NFS_MOUNT_NOAC : 0); + if (nfs_mount_version >= 2) + data.flags |= (tcp ? NFS_MOUNT_TCP : 0); + if (nfs_mount_version >= 3) + data.flags |= (nolock ? NFS_MOUNT_NONLM : 0); + if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) { + bb_error_msg("NFSv%d not supported", nfsvers); + goto fail; + } + if (nfsvers && !mountvers) + mountvers = (nfsvers < 3) ? 1 : nfsvers; + if (nfsvers && nfsvers < mountvers) { + mountvers = nfsvers; + } + + /* Adjust options if none specified */ + if (!data.timeo) + data.timeo = tcp ? 70 : 7; + + data.version = nfs_mount_version; + + if (vfsflags & MS_REMOUNT) + goto do_mount; + + /* + * If the previous mount operation on the same host was + * backgrounded, and the "bg" for this mount is also set, + * give up immediately, to avoid the initial timeout. + */ + if (bg && we_saw_this_host_before(hostname)) { + daemonized = daemonize(); /* parent or error */ + if (daemonized <= 0) { /* parent or error */ + retval = -daemonized; + goto ret; + } + } + + /* create mount daemon client */ + /* See if the nfs host = mount host. */ + if (mounthost) { + if (mounthost[0] >= '0' && mounthost[0] <= '9') { + mount_server_addr.sin_family = AF_INET; + mount_server_addr.sin_addr.s_addr = inet_addr(hostname); + } else { + hp = gethostbyname(mounthost); + if (hp == NULL) { + bb_herror_msg("%s", mounthost); + goto fail; + } else { + if (hp->h_length > sizeof(struct in_addr)) { + bb_error_msg("got bad hp->h_length?"); + hp->h_length = sizeof(struct in_addr); + } + mount_server_addr.sin_family = AF_INET; + memcpy(&mount_server_addr.sin_addr, + hp->h_addr, hp->h_length); + } + } + } + + /* + * The following loop implements the mount retries. When the mount + * times out, and the "bg" option is set, we background ourself + * and continue trying. + * + * The case where the mount point is not present and the "bg" + * option is set, is treated as a timeout. This is done to + * support nested mounts. + * + * The "retry" count specified by the user is the number of + * minutes to retry before giving up. + */ + { + struct timeval total_timeout; + struct timeval retry_timeout; + struct pmap* pm_mnt; + time_t t; + time_t prevt; + time_t timeout; + + retry_timeout.tv_sec = 3; + retry_timeout.tv_usec = 0; + total_timeout.tv_sec = 20; + total_timeout.tv_usec = 0; + timeout = time(NULL) + 60 * retry; + prevt = 0; + t = 30; +retry: + /* be careful not to use too many CPU cycles */ + if (t - prevt < 30) + sleep(30); + + pm_mnt = get_mountport(&mount_server_addr, + mountprog, + mountvers, + proto, + mountport); + nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers; + + /* contact the mount daemon via TCP */ + mount_server_addr.sin_port = htons(pm_mnt->pm_port); + msock = RPC_ANYSOCK; + + switch (pm_mnt->pm_prot) { + case IPPROTO_UDP: + mclient = clntudp_create(&mount_server_addr, + pm_mnt->pm_prog, + pm_mnt->pm_vers, + retry_timeout, + &msock); + if (mclient) + break; + mount_server_addr.sin_port = htons(pm_mnt->pm_port); + msock = RPC_ANYSOCK; + case IPPROTO_TCP: + mclient = clnttcp_create(&mount_server_addr, + pm_mnt->pm_prog, + pm_mnt->pm_vers, + &msock, 0, 0); + break; + default: + mclient = 0; + } + if (!mclient) { + if (!daemonized && prevt == 0) + error_msg_rpc(clnt_spcreateerror(" ")); + } else { + enum clnt_stat clnt_stat; + /* try to mount hostname:pathname */ + mclient->cl_auth = authunix_create_default(); + + /* make pointers in xdr_mountres3 NULL so + * that xdr_array allocates memory for us + */ + memset(&status, 0, sizeof(status)); + + if (pm_mnt->pm_vers == 3) + clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT, + (xdrproc_t) xdr_dirpath, + (caddr_t) &pathname, + (xdrproc_t) xdr_mountres3, + (caddr_t) &status, + total_timeout); + else + clnt_stat = clnt_call(mclient, MOUNTPROC_MNT, + (xdrproc_t) xdr_dirpath, + (caddr_t) &pathname, + (xdrproc_t) xdr_fhstatus, + (caddr_t) &status, + total_timeout); + + if (clnt_stat == RPC_SUCCESS) + goto prepare_kernel_data; /* we're done */ + if (errno != ECONNREFUSED) { + error_msg_rpc(clnt_sperror(mclient, " ")); + goto fail; /* don't retry */ + } + /* Connection refused */ + if (!daemonized && prevt == 0) /* print just once */ + error_msg_rpc(clnt_sperror(mclient, " ")); + auth_destroy(mclient->cl_auth); + clnt_destroy(mclient); + mclient = 0; + close(msock); + } + + /* Timeout. We are going to retry... maybe */ + + if (!bg) + goto fail; + if (!daemonized) { + daemonized = daemonize(); + if (daemonized <= 0) { /* parent or error */ + retval = -daemonized; + goto ret; + } + } + prevt = t; + t = time(NULL); + if (t >= timeout) + /* TODO error message */ + goto fail; + + goto retry; + } + +prepare_kernel_data: + + if (nfsvers == 2) { + if (status.nfsv2.fhs_status != 0) { + bb_error_msg("%s:%s failed, reason given by server: %s", + hostname, pathname, + nfs_strerror(status.nfsv2.fhs_status)); + goto fail; + } + memcpy(data.root.data, + (char *) status.nfsv2.fhstatus_u.fhs_fhandle, + NFS_FHSIZE); + data.root.size = NFS_FHSIZE; + memcpy(data.old_root.data, + (char *) status.nfsv2.fhstatus_u.fhs_fhandle, + NFS_FHSIZE); + } else { + fhandle3 *my_fhandle; + if (status.nfsv3.fhs_status != 0) { + bb_error_msg("%s:%s failed, reason given by server: %s", + hostname, pathname, + nfs_strerror(status.nfsv3.fhs_status)); + goto fail; + } + my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle; + memset(data.old_root.data, 0, NFS_FHSIZE); + memset(&data.root, 0, sizeof(data.root)); + data.root.size = my_fhandle->fhandle3_len; + memcpy(data.root.data, + (char *) my_fhandle->fhandle3_val, + my_fhandle->fhandle3_len); + + data.flags |= NFS_MOUNT_VER3; + } + + /* create nfs socket for kernel */ + + if (tcp) { + if (nfs_mount_version < 3) { + bb_error_msg("NFS over TCP is not supported"); + goto fail; + } + fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); + } else + fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); + if (fsock < 0) { + bb_perror_msg("nfs socket"); + goto fail; + } + if (bindresvport(fsock, 0) < 0) { + bb_perror_msg("nfs bindresvport"); + goto fail; + } + if (port == 0) { + server_addr.sin_port = PMAPPORT; + port = pmap_getport(&server_addr, nfsprog, nfsvers, + tcp ? IPPROTO_TCP : IPPROTO_UDP); + if (port == 0) + port = NFS_PORT; + } + server_addr.sin_port = htons(port); + + /* prepare data structure for kernel */ + + data.fd = fsock; + memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); + strncpy(data.hostname, hostname, sizeof(data.hostname)); + + /* clean up */ + + auth_destroy(mclient->cl_auth); + clnt_destroy(mclient); + close(msock); + + if (bg) { + /* We must wait until mount directory is available */ + struct stat statbuf; + int delay = 1; + while (stat(mp->mnt_dir, &statbuf) == -1) { + if (!daemonized) { + daemonized = daemonize(); + if (daemonized <= 0) { /* parent or error */ + retval = -daemonized; + goto ret; + } + } + sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */ + delay *= 2; + if (delay > 30) + delay = 30; + } + } + +do_mount: /* perform actual mount */ + + mp->mnt_type = "nfs"; + retval = mount_it_now(mp, vfsflags, (char*)&data); + goto ret; + +fail: /* abort */ + + if (msock != -1) { + if (mclient) { + auth_destroy(mclient->cl_auth); + clnt_destroy(mclient); + } + close(msock); + } + if (fsock != -1) + close(fsock); + +ret: + free(hostname); + free(mounthost); + free(filteropts); + return retval; +} + +#else /* !ENABLE_FEATURE_MOUNT_NFS */ + +/* Never called. Call should be optimized out. */ +int nfsmount(struct mntent *mp, int vfsflags, char *filteropts); + +#endif /* !ENABLE_FEATURE_MOUNT_NFS */ + +// Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem +// type detection. Returns 0 for success, nonzero for failure. +// NB: mp->xxx fields may be trashed on exit +static int singlemount(struct mntent *mp, int ignore_busy) +{ + int rc = -1, vfsflags; + char *loopFile = 0, *filteropts = 0; + llist_t *fl = 0; + struct stat st; + + vfsflags = parse_mount_options(mp->mnt_opts, &filteropts); + + // Treat fstype "auto" as unspecified. + + if (mp->mnt_type && !strcmp(mp->mnt_type,"auto")) mp->mnt_type = 0; + + // Might this be an CIFS filesystem? + + if (ENABLE_FEATURE_MOUNT_CIFS && + (!mp->mnt_type || !strcmp(mp->mnt_type,"cifs")) && + (mp->mnt_fsname[0]==mp->mnt_fsname[1] && (mp->mnt_fsname[0]=='/' || mp->mnt_fsname[0]=='\\'))) + { + struct hostent *he; + char ip[32], *s; + + rc = 1; + // Replace '/' with '\' and verify that unc points to "//server/share". + + for (s = mp->mnt_fsname; *s; ++s) + if (*s == '/') *s = '\\'; + + // get server IP + + s = strrchr(mp->mnt_fsname, '\\'); + if (s == mp->mnt_fsname+1) goto report_error; + *s = 0; + he = gethostbyname(mp->mnt_fsname+2); + *s = '\\'; + if (!he) goto report_error; + + // Insert ip=... option into string flags. (NOTE: Add IPv6 support.) + + sprintf(ip, "ip=%d.%d.%d.%d", he->h_addr[0], he->h_addr[1], + he->h_addr[2], he->h_addr[3]); + parse_mount_options(ip, &filteropts); + + // compose new unc '\\server-ip\share' + + mp->mnt_fsname = xasprintf("\\\\%s%s", ip+3, + strchr(mp->mnt_fsname+2,'\\')); + + // lock is required + vfsflags |= MS_MANDLOCK; + + mp->mnt_type = "cifs"; + rc = mount_it_now(mp, vfsflags, filteropts); + if (ENABLE_FEATURE_CLEAN_UP) free(mp->mnt_fsname); + goto report_error; + } + + // Might this be an NFS filesystem? + + if (ENABLE_FEATURE_MOUNT_NFS && + (!mp->mnt_type || !strcmp(mp->mnt_type,"nfs")) && + strchr(mp->mnt_fsname, ':') != NULL) + { + rc = nfsmount(mp, vfsflags, filteropts); + goto report_error; + } + + // Look at the file. (Not found isn't a failure for remount, or for + // a synthetic filesystem like proc or sysfs.) + + if (!lstat(mp->mnt_fsname, &st) && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) + { + // Do we need to allocate a loopback device for it? + + if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) { + loopFile = bb_simplify_path(mp->mnt_fsname); + mp->mnt_fsname = 0; + switch (set_loop(&(mp->mnt_fsname), loopFile, 0)) { + case 0: + case 1: + break; + default: + bb_error_msg( errno == EPERM || errno == EACCES + ? bb_msg_perm_denied_are_you_root + : "cannot setup loop device"); + return errno; + } + + // Autodetect bind mounts + + } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) + vfsflags |= MS_BIND; + } + + /* If we know the fstype (or don't need to), jump straight + * to the actual mount. */ + + if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) + rc = mount_it_now(mp, vfsflags, filteropts); + + // Loop through filesystem types until mount succeeds or we run out + + else { + + /* Initialize list of block backed filesystems. This has to be + * done here so that during "mount -a", mounts after /proc shows up + * can autodetect. */ + + if (!fslist) { + fslist = get_block_backed_filesystems(); + if (ENABLE_FEATURE_CLEAN_UP && fslist) + atexit(delete_block_backed_filesystems); + } + + for (fl = fslist; fl; fl = fl->link) { + mp->mnt_type = fl->data; + rc = mount_it_now(mp, vfsflags, filteropts); + if (!rc) break; + } + } + + // If mount failed, clean up loop file (if any). + + if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) { + del_loop(mp->mnt_fsname); + if (ENABLE_FEATURE_CLEAN_UP) { + free(loopFile); + free(mp->mnt_fsname); + } + } + +report_error: + if (ENABLE_FEATURE_CLEAN_UP) free(filteropts); + + if (rc && errno == EBUSY && ignore_busy) rc = 0; + if (rc < 0) + /* perror here sometimes says "mounting ... on ... failed: Success" */ + bb_error_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir); + + return rc; +} + +// Parse options, if necessary parse fstab/mtab, and call singlemount for +// each directory to be mounted. + +const char must_be_root[] = "you must be root"; + +int mount_main(int argc, char **argv) +{ + enum { OPT_ALL = 0x10 }; + + char *cmdopts = xstrdup(""), *fstype=0, *storage_path=0; + char *opt_o; + const char *fstabname; + FILE *fstab; + int i, j, rc = 0; + unsigned opt; + struct mntent mtpair[2], *mtcur = mtpair; + SKIP_DESKTOP(const int nonroot = 0;) + USE_DESKTOP( int nonroot = (getuid() != 0);) + + /* parse long options, like --bind and --move. Note that -o option + * and --option are synonymous. Yes, this means --remount,rw works. */ + + for (i = j = 0; i < argc; i++) { + if (argv[i][0] == '-' && argv[i][1] == '-') { + append_mount_options(&cmdopts, argv[i]+2); + } else argv[j++] = argv[i]; + } + argv[j] = 0; + argc = j; + + // Parse remaining options + + opt = getopt32(argc, argv, "o:t:rwanfvs", &opt_o, &fstype); + if (opt & 0x1) append_mount_options(&cmdopts, opt_o); // -o + //if (opt & 0x2) // -t + if (opt & 0x4) append_mount_options(&cmdopts, "ro"); // -r + if (opt & 0x8) append_mount_options(&cmdopts, "rw"); // -w + //if (opt & 0x10) // -a + if (opt & 0x20) USE_FEATURE_MTAB_SUPPORT(useMtab = 0); // -n + if (opt & 0x40) USE_FEATURE_MTAB_SUPPORT(fakeIt = 1); // -f + //if (opt & 0x80) // -v: verbose (ignore) + //if (opt & 0x100) // -s: sloppy (ignore) + argv += optind; + argc -= optind; + + // Three or more non-option arguments? Die with a usage message. + + if (argc > 2) bb_show_usage(); + + // If we have no arguments, show currently mounted filesystems + + if (!argc) { + if (!(opt & OPT_ALL)) { + FILE *mountTable = setmntent(bb_path_mtab_file, "r"); + + if (!mountTable) bb_error_msg_and_die("no %s", bb_path_mtab_file); + + while (getmntent_r(mountTable, mtpair, bb_common_bufsiz1, + sizeof(bb_common_bufsiz1))) + { + // Don't show rootfs. FIXME: why?? + if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue; + + if (!fstype || !strcmp(mtpair->mnt_type, fstype)) + printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname, + mtpair->mnt_dir, mtpair->mnt_type, + mtpair->mnt_opts); + } + if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable); + return EXIT_SUCCESS; + } + } else storage_path = bb_simplify_path(argv[0]); + + // When we have two arguments, the second is the directory and we can + // skip looking at fstab entirely. We can always abspath() the directory + // argument when we get it. + + if (argc == 2) { + if (nonroot) + bb_error_msg_and_die(must_be_root); + mtpair->mnt_fsname = argv[0]; + mtpair->mnt_dir = argv[1]; + mtpair->mnt_type = fstype; + mtpair->mnt_opts = cmdopts; + rc = singlemount(mtpair, 0); + goto clean_up; + } + + i = parse_mount_options(cmdopts, 0); + if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags + bb_error_msg_and_die(must_be_root); + + // If we have a shared subtree flag, don't worry about fstab or mtab. + + if (ENABLE_FEATURE_MOUNT_FLAGS && + (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))) + { + rc = mount("", argv[0], "", i, ""); + if (rc) bb_perror_msg_and_die("%s", argv[0]); + goto clean_up; + } + + // Open either fstab or mtab + + fstabname = "/etc/fstab"; + if (i & MS_REMOUNT) { + fstabname = bb_path_mtab_file; + } + fstab = setmntent(fstabname, "r"); + if (!fstab) + bb_perror_msg_and_die("cannot read %s", fstabname); + + // Loop through entries until we find what we're looking for. + + memset(mtpair, 0, sizeof(mtpair)); + for (;;) { + struct mntent *mtnext = (mtcur==mtpair ? mtpair+1 : mtpair); + + // Get next fstab entry + + if (!getmntent_r(fstab, mtcur, bb_common_bufsiz1 + + (mtcur==mtpair ? sizeof(bb_common_bufsiz1)/2 : 0), + sizeof(bb_common_bufsiz1)/2)) + { + // Were we looking for something specific? + + if (argc) { + + // If we didn't find anything, complain. + + if (!mtnext->mnt_fsname) + bb_error_msg_and_die("can't find %s in %s", + argv[0], fstabname); + + mtcur = mtnext; + if (nonroot) { + // fstab must have "users" or "user" + if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS)) + bb_error_msg_and_die(must_be_root); + } + + // Mount the last thing we found. + + mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); + append_mount_options(&(mtcur->mnt_opts), cmdopts); + rc = singlemount(mtcur, 0); + free(mtcur->mnt_opts); + } + goto clean_up; + } + + /* If we're trying to mount something specific and this isn't it, + * skip it. Note we must match both the exact text in fstab (ala + * "proc") or a full path from root */ + + if (argc) { + + // Is this what we're looking for? + + if (strcmp(argv[0], mtcur->mnt_fsname) && + strcmp(storage_path, mtcur->mnt_fsname) && + strcmp(argv[0], mtcur->mnt_dir) && + strcmp(storage_path, mtcur->mnt_dir)) continue; + + // Remember this entry. Something later may have overmounted + // it, and we want the _last_ match. + + mtcur = mtnext; + + // If we're mounting all. + + } else { + // Do we need to match a filesystem type? + // TODO: support "-t type1,type2"; "-t notype1,type2" + + if (fstype && strcmp(mtcur->mnt_type, fstype)) continue; + + // Skip noauto and swap anyway. + + if (parse_mount_options(mtcur->mnt_opts, 0) + & (MOUNT_NOAUTO | MOUNT_SWAP)) continue; + + // No, mount -a won't mount anything, + // even user mounts, for mere humans. + + if (nonroot) + bb_error_msg_and_die(must_be_root); + + // Mount this thing. + + if (singlemount(mtcur, 1)) { + /* Count number of failed mounts */ + rc++; + } + } + } + if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab); + +clean_up: + + if (ENABLE_FEATURE_CLEAN_UP) { + free(storage_path); + free(cmdopts); + } + + return rc; +} |