Initial revision0_29alpha2

1 files changed, 430 insertions, 0 deletions

diff --git a/mount.c b/mount.c
new file mode 100644
index 0000000..010757d
--- /dev/null
+++ b/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;
+}