Fix long standing bug with old gnu tar files, add a check so tar will

complain "unknown file type" if it tries to extract an oldgnu tar file
and TAR_FEATURE_OLDGNU_COMPATABILITY sint defined.
Print a warning if unisupported gnu extensions are encountered.

3 files changed, 31 insertions, 19 deletions

diff --git a/archival/Config.in b/archival/Config.in
index affde32c8..cc65b6db4 100644
--- a/archival/Config.in
+++ b/archival/Config.in
@@ -182,26 +182,29 @@ config CONFIG_FEATURE_TAR_GZIP
 	help
 	  Please submit a patch to add help text for this item.
 
-config CONFIG_FEATURE_TAR_OLD_FORMAT
+config CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
 	bool "  Enable support for old tar header format"
-	default n
+	default N
 	depends on CONFIG_TAR
 	help
-	  Please submit a patch to add help text for this item.
+	  This option is required to unpack archives created with
+	  in the old GNU format, help to kill this old format by
+	  repacking your ancient archives with the new format.
 
-config CONFIG_FEATURE_GNUTAR_LONG_FILENAME
-	bool "  Enable support for GNU long filenames"
+config CONFIG_FEATURE_TAR_GNU_EXTENSIONS
+	bool "  Enable support for some GNU tar extensions"
 	default y
 	depends on CONFIG_TAR
 	help
-	  Please submit a patch to add help text for this item.
+	  With this option usybox supports the GNU long filename
+	  and linkanmes.
 
 config CONFIG_FEATURE_UNARCHIVE_TAPE
 	bool "  Enable tape drive support"
 	default n
 	depends on CONFIG_TAR || CONFIG_CPIO
 	help
-	  Please submit a patch to add help text for this item.
+	  I dont think this is needed anymore.
 
 config CONFIG_UNCOMPRESS
 	bool "uncompress"
diff --git a/archival/libunarchive/data_extract_all.c b/archival/libunarchive/data_extract_all.c
index 9c4510e6b..1eb8bb388 100644
--- a/archival/libunarchive/data_extract_all.c
+++ b/archival/libunarchive/data_extract_all.c
@@ -84,6 +84,8 @@ extern void data_extract_all(archive_handle_t *archive_handle)
 				perror_msg("Cannot create node %s", file_header->name);
 			}
 			break;
+		default:
+			error_msg_and_die("Unrecognised file type");
 	}
 
 	chmod(file_header->name, file_header->mode);
diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index 5fed7c1bf..2cb141ede 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -20,7 +20,7 @@
 #include "unarchive.h"
 #include "libbb.h"
 
-#ifdef CONFIG_FEATURE_GNUTAR_LONG_FILENAME
+#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
 static char *longname = NULL;
 static char *linkname = NULL;
 #endif
@@ -72,7 +72,7 @@ extern char get_header_tar(archive_handle_t *archive_handle)
 	 * 0's are for the old tar format
 	 */
 	if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
-#ifdef CONFIG_FEATURE_TAR_OLD_FORMAT
+#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
 		if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
 #endif
 			error_msg_and_die("Invalid tar magic");
@@ -90,7 +90,7 @@ extern char get_header_tar(archive_handle_t *archive_handle)
 		return(EXIT_FAILURE);
 	}
 
-#ifdef CONFIG_FEATURE_GNUTAR_LONG_FILENAME
+#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
 	if (longname) {
 		file_header->name = longname;
 		longname = NULL;
@@ -120,33 +120,34 @@ extern char get_header_tar(archive_handle_t *archive_handle)
 	file_header->device = (dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) +
 				 strtol(tar.formated.devminor, NULL, 8));
 
-#if defined CONFIG_FEATURE_TAR_OLD_FORMAT || defined CONFIG_FEATURE_GNUTAR_LONG_FILENAME
+#if defined CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY || defined CONFIG_FEATURE_TAR_GNU_EXTENSIONS
 	/* Fix mode, used by the old format */
 	switch (tar.formated.typeflag) {
-# ifdef CONFIG_FEATURE_TAR_OLD_FORMAT
+# ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
 	case 0:
+	case '0':
 		file_header->mode |= S_IFREG;
 		break;
-	case 1:
+	case '1':
 		error_msg("Internal hard link not supported");
 		break;
-	case 2:
+	case '2':
 		file_header->mode |= S_IFLNK;
 		break;
-	case 3:
+	case '3':
 		file_header->mode |= S_IFCHR;
 		break;
-	case 4:
+	case '4':
 		file_header->mode |= S_IFBLK;
 		break;
-	case 5:
+	case '5':
 		file_header->mode |= S_IFDIR;
 		break;
-	case 6:
+	case '6':
 		file_header->mode |= S_IFIFO;
 		break;
 # endif
-# ifdef CONFIG_FEATURE_GNUTAR_LONG_FILENAME
+# ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
 	case 'L': {
 			longname = xmalloc(file_header->size + 1);
 			archive_xread_all(archive_handle, longname, file_header->size);
@@ -164,6 +165,12 @@ extern char get_header_tar(archive_handle_t *archive_handle)
 			file_header->name = linkname;
 			return(get_header_tar(archive_handle));
 		}
+	case 'D':
+	case 'M':
+	case 'N':
+	case 'S':
+	case 'V':
+		error_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
 # endif
 	}
 #endif