1 files changed, 18 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c
index 8e7437a..332ac0d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -57,6 +57,8 @@ _opkg_opk_main_extract(const char *file_name, const char *outer_member,
 	struct _opkg_opk_main_file    file;
 	struct opkg_opk_gzip         *outer_gzip;
 	struct opkg_opk_ustar        *outer_ustar;
+	char                         *buffer;
+	size_t                        size;
 	struct opkg_opk_gzip         *inner_gzip;
 	struct opkg_opk_ustar        *inner_ustar;
 
@@ -79,6 +81,22 @@ _opkg_opk_main_extract(const char *file_name, const char *outer_member,
 		goto error2;
 	}
 
+	if (opkg_opk_ustar_seek(outer_ustar, 1, "debian-binary") !=
+			OPKG_OPK_OK) {
+		fputs("Error: Failed to find \"debian-binary\" in archive\n",
+				stderr);
+		goto error3;
+	}
+	if (opkg_opk_ustar_read(outer_ustar, &buffer, &size) != OPKG_OPK_OK) {
+		fputs("Error: Failed to read \"debian-binary\" in archive\n",
+				stderr);
+		goto error3;
+	}
+	if (size < 4 || strncmp(buffer, "2.", 2) != 0) {
+		fputs("Error: Unsupported package version\n", stderr);
+		goto error3;
+	}
+
 	if (opkg_opk_ustar_seek(outer_ustar, 1, outer_member) != OPKG_OPK_OK) {
 		fprintf(stderr, "Error: Failed to find \"%s\" in archive\n",
 				outer_member);