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-rw-r--r--util-linux/mount.c430
1 files changed, 430 insertions, 0 deletions
diff --git a/util-linux/mount.c b/util-linux/mount.c
new file mode 100644
index 0000000..010757d
--- /dev/null
+++ b/util-linux/mount.c
@@ -0,0 +1,430 @@
+/*
+ 3/21/1999 Charles P. Wright <cpwright@cpwright.com>
+ searches through fstab when -a is passed
+ will try mounting stuff with all fses when passed -t auto
+
+ 1999-04-17 Dave Cinege...Rewrote -t auto. Fixed ro mtab.
+*/
+
+#include "internal.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <mntent.h>
+#include <sys/mount.h>
+#include <ctype.h>
+
+const char mount_usage[] = "mount\n"
+"\t\tmount [flags] special-device directory\n"
+"\n"
+"Flags:\n"
+"\t-a:\tMount all file systems in fstab.\n"
+"\t-f:\t\"Fake\" mount. Add entry to mount table but don't mount it.\n"
+"\t-n:\tDon't write a mount table entry.\n"
+"\t-o option:\tOne of many filesystem options, listed below.\n"
+"\t-r:\tMount the filesystem read-only.\n"
+"\t-t filesystem-type:\tSpecify the filesystem type.\n"
+"\t-w:\tMount for reading and writing (default).\n"
+"\n"
+"Options for use with the \"-o\" flag:\n"
+"\tasync / sync:\tWrites are asynchronous / synchronous.\n"
+"\tdev / nodev:\tAllow use of special device files / disallow them.\n"
+"\texec / noexec:\tAllow use of executable files / disallow them.\n"
+"\tsuid / nosuid:\tAllow set-user-id-root programs / disallow them.\n"
+"\tremount: Re-mount a currently-mounted filesystem, changing its flags.\n"
+"\tro / rw: Mount for read-only / read-write.\n"
+"\t"
+"There are EVEN MORE flags that are specific to each filesystem.\n"
+"You'll have to see the written documentation for those.\n";
+
+struct mount_options {
+ const char * name;
+ unsigned long and;
+ unsigned long or;
+};
+
+static const struct mount_options mount_options[] = {
+ { "async", ~MS_SYNCHRONOUS,0 },
+ { "defaults", ~0, 0 },
+ { "dev", ~MS_NODEV, 0 },
+ { "exec", ~MS_NOEXEC, 0 },
+ { "nodev", ~0, MS_NODEV },
+ { "noexec", ~0, MS_NOEXEC },
+ { "nosuid", ~0, MS_NOSUID },
+ { "remount", ~0, MS_REMOUNT },
+ { "ro", ~0, MS_RDONLY },
+ { "rw", ~MS_RDONLY, 0 },
+ { "suid", ~MS_NOSUID, 0 },
+ { "sync", ~0, MS_SYNCHRONOUS },
+ { 0, 0, 0 }
+};
+
+static void
+show_flags(unsigned long flags, char * buffer)
+{
+ const struct mount_options * f = mount_options;
+ while ( f->name ) {
+ if ( flags & f->and ) {
+ int length = strlen(f->name);
+ memcpy(buffer, f->name, length);
+ buffer += length;
+ *buffer++ = ',';
+ *buffer = '\0';
+ }
+ f++;
+ }
+}
+
+static void
+one_option(
+ char * option
+,unsigned long * flags
+,char * data)
+{
+ const struct mount_options * f = mount_options;
+
+ while ( f->name != 0 ) {
+ if ( strcasecmp(f->name, option) == 0 ) {
+ *flags &= f->and;
+ *flags |= f->or;
+ return;
+ }
+ f++;
+ }
+ if ( *data ) {
+ data += strlen(data);
+ *data++ = ',';
+ }
+ strcpy(data, option);
+}
+
+static void
+parse_mount_options(
+ char * options
+,unsigned long * flags
+,char * data)
+{
+ while ( *options ) {
+ char * comma = strchr(options, ',');
+ if ( comma )
+ *comma = '\0';
+ one_option(options, flags, data);
+ if ( comma ) {
+ *comma = ',';
+ options = ++comma;
+ }
+ else
+ break;
+ }
+}
+
+int
+mount_one(
+ char * blockDevice
+,char * directory
+,char * filesystemType
+,unsigned long flags
+,char * string_flags
+,int noMtab
+,int fake)
+{
+ int error = 0;
+ int status = 0;
+
+ char buf[255];
+
+ if (!fake) {
+ if (*filesystemType == 'a') { //Will fail on real FS starting with 'a'
+
+ FILE *f = fopen("/proc/filesystems", "r");
+
+ if (f == NULL) return 1;
+
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+ filesystemType = buf;
+ if (*filesystemType == '\t') { // Not a nodev filesystem
+
+ while (*filesystemType && *filesystemType != '\n') filesystemType++;
+ *filesystemType = '\0';
+
+ filesystemType = buf;
+ filesystemType++; //hop past tab
+
+ status = mount(blockDevice, directory, filesystemType,
+ flags|MS_MGC_VAL ,string_flags);
+ error = errno;
+
+ if (status == 0) break;
+ }
+ }
+ fclose(f);
+ } else {
+
+ status = mount( blockDevice, directory, filesystemType,
+ flags|MS_MGC_VAL ,string_flags);
+ error = errno;
+ }
+ }
+
+ if ( status == 0 ) {
+ char * s = &string_flags[strlen(string_flags)];
+ FILE * mountTable;
+ if ( s != string_flags ) {
+ *s++ = ',';
+ show_flags(flags, s);
+ }
+ if ( !noMtab && (mountTable = setmntent("/etc/mtab", "a+")) ) {
+ int length = strlen(directory);
+ struct mntent m;
+
+ if ( length > 1 && directory[length - 1] == '/' )
+ directory[length - 1] = '\0';
+
+ if ( filesystemType == 0 ) {
+ struct mntent * p
+ = findMountPoint(blockDevice, "/proc/mounts");
+
+ if ( p && p->mnt_type )
+ filesystemType = p->mnt_type;
+ }
+ m.mnt_fsname = blockDevice;
+ m.mnt_dir = directory;
+ m.mnt_type = filesystemType ? filesystemType : "default";
+
+ if (*string_flags) {
+ m.mnt_opts = string_flags;
+ } else {
+ if ( (flags | MS_RDONLY) == flags )
+ m.mnt_opts = "ro";
+ else
+ m.mnt_opts = "rw";
+ }
+
+ m.mnt_freq = 0;
+ m.mnt_passno = 0;
+ addmntent(mountTable, &m);
+ endmntent(mountTable);
+ }
+ return 0;
+ } else {
+ fprintf(stderr, "Mount %s", blockDevice);
+ if ( filesystemType && *filesystemType )
+ fprintf(stderr, " (type %s)", filesystemType);
+
+ fprintf(
+ stderr
+ ," on %s: "
+ ,directory);
+
+ switch ( error ) {
+ case EPERM:
+ if (geteuid() == 0)
+ fprintf(
+ stderr
+ ,"mount point %s is not a directory"
+ ,blockDevice);
+ else
+ fprintf(
+ stderr
+ ,"must be superuser to use mount");
+ break;
+ case EBUSY:
+ fprintf(
+ stderr
+ ,"%s already mounted or %s busy"
+ ,blockDevice
+ ,directory);
+ break;
+ case ENOENT:
+ {
+ struct stat statbuf;
+ if ( stat(directory, &statbuf) != 0 )
+ fprintf(
+ stderr
+ ,"directory %s does not exist"
+ ,directory);
+ else if ( stat(blockDevice, &statbuf) != 0 )
+ fprintf(
+ stderr
+ ,"block device %s does not exist"
+ ,blockDevice);
+ else
+ fprintf(
+ stderr
+ ,"%s is not mounted on %s, but the mount table says it is."
+ ,blockDevice
+ ,directory);
+ break;
+ }
+ case ENOTDIR:
+ fprintf(
+ stderr
+ ,"%s is not a directory"
+ ,directory);
+ break;
+ case EINVAL:
+ fprintf(
+ stderr
+ ,"wrong filesystem type, or bad superblock on %s"
+ ,blockDevice);
+ break;
+ case EMFILE:
+ fprintf(stderr, "mount table full");
+ break;
+ case EIO:
+ fprintf(
+ stderr
+ ,"I/O error reading %s"
+ ,blockDevice);
+ break;
+ case ENODEV:
+ {
+ FILE * f = fopen("/proc/filesystems", "r");
+
+ fprintf(
+ stderr
+ ,"filesystem type %s not in kernel.\n"
+ ,filesystemType);
+ fprintf(stderr, "Do you need to load a module?\n");
+ if ( f ) {
+ char buf[100];
+
+ fprintf(
+ stderr
+ ,"Here are the filesystem types the kernel"
+ " can mount:\n");
+ while ( fgets(buf, sizeof(buf), f) != 0 )
+ fprintf(stderr, "\t%s", buf);
+ fclose(f);
+ }
+ break;
+ }
+ case ENOTBLK:
+ fprintf(
+ stderr
+ ,"%s is not a block device"
+ ,blockDevice);
+ break;
+ case ENXIO:
+ fprintf(
+ stderr
+ ,"%s is not a valid block device"
+ ,blockDevice);
+ break;
+ default:
+ fputs(strerror(errno), stderr);
+ }
+ putc('\n', stderr);
+ return -1;
+ }
+}
+
+extern int
+mount_main(struct FileInfo * i, int argc, char * * argv)
+{
+ char string_flags[1024];
+ unsigned long flags = 0;
+ char * filesystemType = "auto";
+ int fake = 0;
+ int noMtab = 0;
+ int all = 0;
+
+ *string_flags = '\0';
+
+ if ( argc == 1 ) {
+ FILE * mountTable;
+ if ( (mountTable = setmntent("/etc/mtab", "r")) ) {
+ struct mntent * m;
+ while ( (m = getmntent(mountTable)) != 0 ) {
+ printf(
+ "%s on %s type %s (%s)\n"
+ ,m->mnt_fsname
+ ,m->mnt_dir
+ ,m->mnt_type
+ ,m->mnt_opts);
+ }
+ endmntent(mountTable);
+ }
+ return 0;
+ }
+
+ while ( argc >= 2 && argv[1][0] == '-' ) {
+ switch ( argv[1][1] ) {
+ case 'f':
+ fake = 1;
+ break;
+ case 'n':
+ noMtab = 1;
+ break;
+ case 'o':
+ if ( argc < 3 ) {
+ usage(mount_usage);
+ return 1;
+ }
+ parse_mount_options(argv[2], &flags, string_flags);
+ argc--;
+ argv++;
+ break;
+ case 'r':
+ flags |= MS_RDONLY;
+ break;
+ case 't':
+ if ( argc < 3 ) {
+ usage(mount_usage);
+ return 1;
+ }
+ filesystemType = argv[2];
+ argc--;
+ argv++;
+ break;
+ case 'v':
+ break;
+ case 'w':
+ flags &= ~MS_RDONLY;
+ break;
+ case 'a':
+ all = 1;
+ break;
+ default:
+ usage(mount_usage);
+ return 1;
+ }
+ argc--;
+ argv++;
+ }
+
+ if (all == 1) {
+ struct mntent *m;
+ FILE *f = setmntent("/etc/fstab", "r");
+
+ if (f == NULL) {
+ return 1;
+ }
+
+ // FIXME: Combine read routine (make new function) with unmount_all to save space.
+
+ while ((m = getmntent(f)) != NULL) {
+ // If the file system isn't noauto, and isn't mounted on /, mount it
+ if ((!strstr(m->mnt_opts, "noauto")) && (m->mnt_dir[1] != '\0')
+ && !((m->mnt_type[0] == 's') && (m->mnt_type[1] == 'w'))
+ && !((m->mnt_type[0] == 'n') && (m->mnt_type[1] == 'f'))) {
+ mount_one(m->mnt_fsname, m->mnt_dir, m->mnt_type, flags, m->mnt_opts, noMtab, fake);
+ }
+ }
+
+ endmntent(f);
+ } else {
+ if ( argc >= 3 ) {
+ if ( mount_one( argv[1], argv[2], filesystemType, flags, string_flags, noMtab, fake) == 0 )
+ return 0;
+ else
+ return 1;
+ } else {
+ usage(mount_usage);
+ return 1;
+ }
+ }
+ return 0;
+}
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