X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=mount.c;h=eb6091f30e3763dc7df780b6a820cb59f8ee04fc;hb=95b520110dc1ee6ee670817fdd6312a8565cf34c;hp=fc057473fb8b6890066ec9d4b891844daeaea7c6;hpb=0c8e2a6580cb83dbca842751fdf672c4f5d2f9bd;p=oweals%2Fbusybox.git

diff --git a/mount.c b/mount.c
index fc057473f..eb6091f30 100644
--- a/mount.c
+++ b/mount.c
@@ -43,7 +43,7 @@
  *	
  */
 
-#include "internal.h"
+#include <limits.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
@@ -51,25 +51,27 @@
 #include <stdio.h>
 #include <mntent.h>
 #include <ctype.h>
+#include "busybox.h"
 #if defined BB_FEATURE_USE_DEVPS_PATCH
-#include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
+#	include <linux/devmtab.h> /* For Erik's nifty devmtab device driver */
 #endif
 
-
-#define MS_MGC_VAL		0xc0ed0000 /* Magic number indicatng "new" flags */
-#define MS_RDONLY        1      /* Mount read-only */
-#define MS_NOSUID        2      /* Ignore suid and sgid bits */
-#define MS_NODEV         4      /* Disallow access to device special files */
-#define MS_NOEXEC        8      /* Disallow program execution */
-#define MS_SYNCHRONOUS  16      /* Writes are synced at once */
-#define MS_REMOUNT      32      /* Alter flags of a mounted FS */
-#define MS_MANDLOCK     64      /* Allow mandatory locks on an FS */
-#define S_QUOTA         128     /* Quota initialized for file/directory/symlink */
-#define S_APPEND        256     /* Append-only file */
-#define S_IMMUTABLE     512     /* Immutable file */
-#define MS_NOATIME      1024    /* Do not update access times. */
-#define MS_NODIRATIME   2048    /* Do not update directory access times */
-
+enum {
+	MS_MGC_VAL = 0xc0ed0000, /* Magic number indicatng "new" flags */
+	MS_RDONLY = 1,      /* Mount read-only */
+	MS_NOSUID = 2,      /* Ignore suid and sgid bits */
+	MS_NODEV = 4,      /* Disallow access to device special files */
+	MS_NOEXEC = 8,      /* Disallow program execution */
+	MS_SYNCHRONOUS = 16,      /* Writes are synced at once */
+	MS_REMOUNT = 32,      /* Alter flags of a mounted FS */
+	MS_MANDLOCK = 64,      /* Allow mandatory locks on an FS */
+	S_QUOTA = 128,     /* Quota initialized for file/directory/symlink */
+	S_APPEND = 256,     /* Append-only file */
+	S_IMMUTABLE = 512,     /* Immutable file */
+	MS_NOATIME = 1024,    /* Do not update access times. */
+	MS_NODIRATIME = 2048,    /* Do not update directory access times */
+	MS_BIND = 4096,    /* Use the new linux 2.4.x "mount --bind" feature */
+};
 
 
 #if defined BB_FEATURE_MOUNT_LOOP
@@ -84,6 +86,7 @@ extern int mount (__const char *__special_file, __const char *__dir,
 extern int umount (__const char *__special_file);
 extern int umount2 (__const char *__special_file, int __flags);
 
+extern int sysfs( int option, unsigned int fs_index, char * buf);
 
 extern const char mtab_file[];	/* Defined in utility.c */
 
@@ -110,47 +113,56 @@ static const struct mount_options mount_options[] = {
 	{"rw", ~MS_RDONLY, 0},
 	{"suid", ~MS_NOSUID, 0},
 	{"sync", ~0, MS_SYNCHRONOUS},
+	{"bind", ~0, MS_BIND},
 	{0, 0, 0}
 };
 
 static int
 do_mount(char *specialfile, char *dir, char *filesystemtype,
 		 long flags, void *string_flags, int useMtab, int fakeIt,
-		 char *mtab_opts)
+		 char *mtab_opts, int mount_all)
 {
 	int status = 0;
+#if defined BB_FEATURE_MOUNT_LOOP
 	char *lofile = NULL;
+#endif
 
 	if (fakeIt == FALSE)
 	{
 #if defined BB_FEATURE_MOUNT_LOOP
 		if (use_loop==TRUE) {
 			int loro = flags & MS_RDONLY;
-			char *lofile = specialfile;
+			
+			lofile = specialfile;
 
 			specialfile = find_unused_loop_device();
 			if (specialfile == NULL) {
-				errorMsg("Could not find a spare loop device\n");
-				return (FALSE);
+				error_msg_and_die("Could not find a spare loop device");
 			}
 			if (set_loop(specialfile, lofile, 0, &loro)) {
-				errorMsg("Could not setup loop device\n");
-				return (FALSE);
+				error_msg_and_die("Could not setup loop device");
 			}
 			if (!(flags & MS_RDONLY) && loro) {	/* loop is ro, but wanted rw */
-				errorMsg("WARNING: loop device is read-only\n");
-				flags &= ~MS_RDONLY;
+				error_msg("WARNING: loop device is read-only");
+				flags |= MS_RDONLY;
 			}
 		}
 #endif
 		status = mount(specialfile, dir, filesystemtype, flags, string_flags);
+		if (status < 0 && errno == EROFS) {
+			error_msg("%s is write-protected, mounting read-only", specialfile);
+			status = mount(specialfile, dir, filesystemtype, flags |= MS_RDONLY, string_flags);
+		}
+		/* Don't whine about already mounted filesystems when mounting all. */
+		if (status < 0 && errno == EBUSY && mount_all)
+			return TRUE;
 	}
 
 
 	/* If the mount was sucessful, do anything needed, then return TRUE */
 	if (status == 0 || fakeIt==TRUE) {
 
-#if defined BB_MTAB
+#if defined BB_FEATURE_MTAB_SUPPORT
 		if (useMtab == TRUE) {
 			erase_mtab(specialfile);	// Clean any stale entries
 			write_mtab(specialfile, dir, filesystemtype, flags, mtab_opts);
@@ -167,7 +179,7 @@ do_mount(char *specialfile, char *dir, char *filesystemtype,
 #endif
 
 	if (errno == EPERM) {
-		fatalError("permission denied. Are you root?\n");
+		error_msg_and_die("permission denied. Are you root?");
 	}
 
 	return (FALSE);
@@ -221,238 +233,190 @@ parse_mount_options(char *options, int *flags, char *strflags)
 	}
 }
 
-int
+static int
 mount_one(char *blockDevice, char *directory, char *filesystemType,
 		  unsigned long flags, char *string_flags, int useMtab, int fakeIt,
-		  char *mtab_opts, int whineOnErrors)
+		  char *mtab_opts, int whineOnErrors, int mount_all)
 {
 	int status = 0;
 
-#if defined BB_FEATURE_USE_PROCFS
-	char buf[255];
 	if (strcmp(filesystemType, "auto") == 0) {
-		FILE *f = fopen("/proc/filesystems", "r");
-
-		if (f == NULL)
-			return (FALSE);
-
-		while (fgets(buf, sizeof(buf), f) != NULL) {
-			filesystemType = buf;
-			if (*filesystemType == '\t') {	// Not a nodev filesystem
-
-				// Add NULL termination to each line
-				while (*filesystemType && *filesystemType != '\n')
-					filesystemType++;
-				*filesystemType = '\0';
-
-				filesystemType = buf;
-				filesystemType++;	// hop past tab
-
+		static const char *noauto_array[] = { "tmpfs", "shm", "proc", "ramfs", "devpts", "devfs", 0 };
+		const char **noauto_fstype;
+		const int num_of_filesystems = sysfs(3, 0, 0);
+		char buf[255];
+		int i=0;
+
+		filesystemType=buf;
+
+		while(i < num_of_filesystems) {
+			sysfs(2, i++, filesystemType);
+			for (noauto_fstype = noauto_array; *noauto_fstype; noauto_fstype++) {
+				if (!strcmp(filesystemType, *noauto_fstype)) {
+					break;
+				}
+			}
+			if (!*noauto_fstype) {
 				status = do_mount(blockDevice, directory, filesystemType,
-								  flags | MS_MGC_VAL, string_flags,
-								  useMtab, fakeIt, mtab_opts);
+					flags | MS_MGC_VAL, string_flags,
+					useMtab, fakeIt, mtab_opts, mount_all);
 				if (status == TRUE)
 					break;
 			}
 		}
-		fclose(f);
-	} else
-#endif
-#if defined BB_FEATURE_USE_DEVPS_PATCH
-	if (strcmp(filesystemType, "auto") == 0) {
-		int fd, i, numfilesystems;
-		char device[] = "/dev/mtab";
-		struct k_fstype *fslist;
-
-		/* open device */ 
-		fd = open(device, O_RDONLY);
-		if (fd < 0)
-			fatalError("open failed for `%s': %s\n", device, strerror (errno));
-
-		/* How many filesystems?  We need to know to allocate enough space */
-		numfilesystems = ioctl (fd, DEVMTAB_COUNT_FILESYSTEMS);
-		if (numfilesystems<0)
-			fatalError("\nDEVMTAB_COUNT_FILESYSTEMS: %s\n", strerror (errno));
-		fslist = (struct k_fstype *) calloc ( numfilesystems, sizeof(struct k_fstype));
-
-		/* Grab the list of available filesystems */
-		status = ioctl (fd, DEVMTAB_GET_FILESYSTEMS, fslist);
-		if (status<0)
-			fatalError("\nDEVMTAB_GET_FILESYSTEMS: %s\n", strerror (errno));
-
-		/* Walk the list trying to mount filesystems 
-		 * that do not claim to be nodev filesystems */
-		for( i = 0 ; i < numfilesystems ; i++) {
-			if (fslist[i].mnt_nodev)
-				continue;
-			status = do_mount(blockDevice, directory, fslist[i].mnt_type,
-							  flags | MS_MGC_VAL, string_flags,
-							  useMtab, fakeIt, mtab_opts);
-			if (status == TRUE)
-				break;
-		}
-		free( fslist);
-		close(fd);
-	} else
-#endif
-	{
+	} else {
 		status = do_mount(blockDevice, directory, filesystemType,
-						  flags | MS_MGC_VAL, string_flags, useMtab,
-						  fakeIt, mtab_opts);
+				flags | MS_MGC_VAL, string_flags, useMtab,
+				fakeIt, mtab_opts, mount_all);
 	}
 
 	if (status == FALSE) {
 		if (whineOnErrors == TRUE) {
-			errorMsg("Mounting %s on %s failed: %s\n",
-					blockDevice, directory, strerror(errno));
+			perror_msg("Mounting %s on %s failed", blockDevice, directory);
 		}
 		return (FALSE);
 	}
 	return (TRUE);
 }
 
+void show_mounts()
+{
+#if defined BB_FEATURE_USE_DEVPS_PATCH
+	int fd, i, numfilesystems;
+	char device[] = "/dev/mtab";
+	struct k_mntent *mntentlist;
+
+	/* open device */ 
+	fd = open(device, O_RDONLY);
+	if (fd < 0)
+		perror_msg_and_die("open failed for `%s'", device);
+
+	/* How many mounted filesystems?  We need to know to 
+	 * allocate enough space for later... */
+	numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
+	if (numfilesystems<0)
+		perror_msg_and_die( "\nDEVMTAB_COUNT_MOUNTS");
+	mntentlist = (struct k_mntent *) xcalloc ( numfilesystems, sizeof(struct k_mntent));
+		
+	/* Grab the list of mounted filesystems */
+	if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
+		perror_msg_and_die( "\nDEVMTAB_GET_MOUNTS");
+
+	for( i = 0 ; i < numfilesystems ; i++) {
+		printf( "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
+				mntentlist[i].mnt_dir, mntentlist[i].mnt_type, 
+				mntentlist[i].mnt_opts, mntentlist[i].mnt_freq, 
+				mntentlist[i].mnt_passno);
+	}
+#ifdef BB_FEATURE_CLEAN_UP
+	/* Don't bother to close files or free memory.  Exit 
+	 * does that automagically, so we can save a few bytes */
+	free( mntentlist);
+	close(fd);
+#endif
+	exit(EXIT_SUCCESS);
+#else
+	FILE *mountTable = setmntent(mtab_file, "r");
+
+	if (mountTable) {
+		struct mntent *m;
+
+		while ((m = getmntent(mountTable)) != 0) {
+			char *blockDevice = m->mnt_fsname;
+			if (strcmp(blockDevice, "/dev/root") == 0) {
+				blockDevice = find_real_root_device_name(blockDevice);
+			}
+			printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
+				   m->mnt_type, m->mnt_opts);
+#ifdef BB_FEATURE_CLEAN_UP
+			if(blockDevice != m->mnt_fsname)
+				free(blockDevice);
+#endif
+		}
+		endmntent(mountTable);
+	} else {
+		perror_msg_and_die("%s", mtab_file);
+	}
+	exit(EXIT_SUCCESS);
+#endif
+}
+
 extern int mount_main(int argc, char **argv)
 {
+	struct stat statbuf;
 	char string_flags_buf[1024] = "";
 	char *string_flags = string_flags_buf;
 	char *extra_opts = string_flags_buf;
 	int flags = 0;
 	char *filesystemType = "auto";
-	char *device = NULL;
-	char *directory = NULL;
+	char *device = xmalloc(PATH_MAX);
+	char *directory = xmalloc(PATH_MAX);
 	int all = FALSE;
 	int fakeIt = FALSE;
 	int useMtab = TRUE;
-	int i;
-	int rc = FALSE;
+	int rc = EXIT_FAILURE;
 	int fstabmount = FALSE;	
+	int opt;
 
-#if defined BB_FEATURE_USE_DEVPS_PATCH
-	if (argc == 1) {
-		int fd, i, numfilesystems;
-		char device[] = "/dev/mtab";
-		struct k_mntent *mntentlist;
-
-		/* open device */ 
-		fd = open(device, O_RDONLY);
-		if (fd < 0)
-			fatalError("open failed for `%s': %s\n", device, strerror (errno));
-
-		/* How many mounted filesystems?  We need to know to 
-		 * allocate enough space for later... */
-		numfilesystems = ioctl (fd, DEVMTAB_COUNT_MOUNTS);
-		if (numfilesystems<0)
-			fatalError( "\nDEVMTAB_COUNT_MOUNTS: %s\n", strerror (errno));
-		mntentlist = (struct k_mntent *) calloc ( numfilesystems, sizeof(struct k_mntent));
-		
-		/* Grab the list of mounted filesystems */
-		if (ioctl (fd, DEVMTAB_GET_MOUNTS, mntentlist)<0)
-			fatalError( "\nDEVMTAB_GET_MOUNTS: %s\n", strerror (errno));
-
-		for( i = 0 ; i < numfilesystems ; i++) {
-			fprintf( stdout, "%s %s %s %s %d %d\n", mntentlist[i].mnt_fsname,
-					mntentlist[i].mnt_dir, mntentlist[i].mnt_type, 
-					mntentlist[i].mnt_opts, mntentlist[i].mnt_freq, 
-					mntentlist[i].mnt_passno);
-		}
-#ifdef BB_FEATURE_CLEAN_UP
-		/* Don't bother to close files or free memory.  Exit 
-		 * does that automagically, so we can save a few bytes */
-		free( mntentlist);
-		close(fd);
+	/* Parse options */
+	while ((opt = getopt(argc, argv, "o:rt:wafnv")) > 0) {
+		switch (opt) {
+		case 'o':
+			parse_mount_options(optarg, &flags, string_flags);
+			break;
+		case 'r':
+			flags |= MS_RDONLY;
+			break;
+		case 't':
+			filesystemType = optarg;
+			break;
+		case 'w':
+			flags &= ~MS_RDONLY;
+			break;
+		case 'a':
+			all = TRUE;
+			break;
+		case 'f':
+			fakeIt = TRUE;
+			break;
+#ifdef BB_FEATURE_MTAB_SUPPORT
+		case 'n':
+			useMtab = FALSE;
+			break;
 #endif
-		exit(TRUE);
+		case 'v':
+			break; /* ignore -v */
+		}
 	}
-#else
-	if (argc == 1) {
-		FILE *mountTable = setmntent(mtab_file, "r");
 
-		if (mountTable) {
-			struct mntent *m;
+	if (!all && optind == argc)
+		show_mounts();
 
-			while ((m = getmntent(mountTable)) != 0) {
-				char *blockDevice = m->mnt_fsname;
-				if (strcmp(blockDevice, "/dev/root") == 0) {
-					find_real_root_device_name( blockDevice);
-				}
-				printf("%s on %s type %s (%s)\n", blockDevice, m->mnt_dir,
-					   m->mnt_type, m->mnt_opts);
-			}
-			endmntent(mountTable);
+	if (optind < argc) {
+		/* if device is a filename get its real path */
+		if (stat(argv[optind], &statbuf) == 0) {
+			realpath(argv[optind], device);
 		} else {
-			perror(mtab_file);
+			safe_strncpy(device, argv[optind], PATH_MAX);
 		}
-		exit(TRUE);
 	}
-#endif
 
-	/* Parse options */
-	i = --argc;
-	argv++;
-	while (i > 0 && **argv) {
-		if (**argv == '-') {
-			char *opt = *argv;
-
-			while (i > 0 && *++opt)
-				switch (*opt) {
-				case 'o':
-					if (--i == 0) {
-						goto goodbye;
-					}
-					parse_mount_options(*(++argv), &flags, string_flags);
-					break;
-				case 'r':
-					flags |= MS_RDONLY;
-					break;
-				case 't':
-					if (--i == 0) {
-						goto goodbye;
-					}
-					filesystemType = *(++argv);
-					break;
-				case 'w':
-					flags &= ~MS_RDONLY;
-					break;
-				case 'a':
-					all = TRUE;
-					break;
-				case 'f':
-					fakeIt = TRUE;
-					break;
-#ifdef BB_MTAB
-				case 'n':
-					useMtab = FALSE;
-					break;
-#endif
-				case 'v':
-					break; /* ignore -v */
-				case 'h':
-				case '-':
-					goto goodbye;
-				}
-		} else {
-			if (device == NULL)
-				device = *argv;
-			else if (directory == NULL)
-				directory = *argv;
-			else {
-				goto goodbye;
-			}
+	if (optind + 1 < argc) {
+		if (realpath(argv[optind + 1], directory) == NULL) {
+			perror_msg_and_die("%s", directory);
 		}
-		i--;
-		argv++;
 	}
-
-	if (all == TRUE || directory == NULL) {
-		struct mntent *m;
+	
+	if (all == TRUE || optind + 1 == argc) {
+		struct mntent *m = NULL;
 		FILE *f = setmntent("/etc/fstab", "r");
 		fstabmount = TRUE;
 
 		if (f == NULL)
-			fatalError( "\nCannot read /etc/fstab: %s\n", strerror (errno));
+			perror_msg_and_die( "\nCannot read /etc/fstab");
 
 		while ((m = getmntent(f)) != NULL) {
-			if (all == FALSE && directory == NULL && (
+			if (all == FALSE && optind + 1 == argc && (
 				(strcmp(device, m->mnt_fsname) != 0) &&
 				(strcmp(device, m->mnt_dir) != 0) ) ) {
 				continue;
@@ -471,42 +435,38 @@ extern int mount_main(int argc, char **argv)
 				parse_mount_options(m->mnt_opts, &flags, string_flags);
 			}
 			
-			device = strdup(m->mnt_fsname);
-			directory = strdup(m->mnt_dir);
+			strcpy(device, m->mnt_fsname);
+			strcpy(directory, m->mnt_dir);
 			filesystemType = strdup(m->mnt_type);
 singlemount:			
+			string_flags = strdup(string_flags);
+			rc = EXIT_SUCCESS;
 #ifdef BB_NFSMOUNT
 			if (strchr(device, ':') != NULL)
 				filesystemType = "nfs";
 			if (strcmp(filesystemType, "nfs") == 0) {
-				rc = nfsmount (device, directory, &flags, &extra_opts, &string_flags, 1)
-				if ( rc != 0) {
-					fatalError("nfsmount failed: %s\n", strerror(errno));	
-					rc = FALSE;
+				if (nfsmount (device, directory, &flags, &extra_opts,
+							&string_flags, 1)) {
+					perror_msg("nfsmount failed");
+					rc = EXIT_FAILURE;
 				}
-			} else
+			}
 #endif
-			rc = mount_one(device, directory, filesystemType, flags,
-				string_flags, useMtab, fakeIt, extra_opts, TRUE);
+			if (!mount_one(device, directory, filesystemType, flags,
+					string_flags, useMtab, fakeIt, extra_opts, TRUE, all))
+				rc = EXIT_FAILURE;
 				
 			if (all == FALSE)
 				break;
-
-			rc = TRUE;	// Always return 0 for 'all'
 		}
 		if (fstabmount == TRUE)
 			endmntent(f);
 			
-		if (all == FALSE && fstabmount == TRUE && directory == NULL)
+		if (all == FALSE && fstabmount == TRUE && m == NULL)
 			fprintf(stderr, "Can't find %s in /etc/fstab\n", device);
 	
-		exit(rc);
+		return rc;
 	}
 	
 	goto singlemount;
-	
-	exit(FALSE);
-
-goodbye:
-	usage(mount_usage);
 }