From: Christos Zoulas <christos@zoulas.com>
Date: Wed, 10 Dec 2014 18:45:43 +0000 (+0000)
Subject: add a demo entry to show shortcomings with the current file magic language.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=56c90a84efbabc9ffd16c48a60d18f77ac5bda01;p=file

add a demo entry to show shortcomings with the current file magic language.
---

diff --git a/TODO b/TODO
index f78893f4..eef01edb 100644
--- a/TODO
+++ b/TODO
@@ -15,3 +15,5 @@ small amount of C is needed (because fast execution is typically only
 required for soft magic, not the more detailed information given by
 hard-wired routines). In this regard, note that hplip, which is
 BSD-licensed, has a magic reimplementation in Python.
+
+Read the kerberos magic entry for more ideas.
diff --git a/magic/Magdir/kerberos b/magic/Magdir/kerberos
new file mode 100644
index 00000000..cb07fedb
--- /dev/null
+++ b/magic/Magdir/kerberos
@@ -0,0 +1,45 @@
+
+#------------------------------------------------------------------------------
+# $File: kerberos,v 1.1 2014/12/10 18:45:43 christos Exp $
+# kerberos: MIT kerberos file binary formats
+#
+
+# This magic entry is for demonstration purposes and could be improved
+# if the following features were implemented in file:
+#
+# Strings inside [[ .. ]] in the descriptions have special meanings and
+# are not printed.
+#
+# 	- Provide some form of iteration in number of components
+#		[[${counter}=%d]] in the description
+#		then append
+#		[${counter}--] in the offset of the entries
+#	- Provide a way to round the next offset
+#		Add [R:4] after the offset?
+#	- Provide a way to have optional entries
+#		XXX: Syntax:
+#	- Provide a way to "save" entries to print them later.
+#		if the description is [[${name}=%s]], then nothing is
+#		printed and a subsequent entry in the same magic file
+#		can refer to ${name}
+#	- Provide a way to format strings as hex values
+#
+# http://www.gnu.org/software/shishi/manual/html_node/\
+#	The-Keytab-Binary-File-Format.html
+#
+
+0		name		keytab_entry
+#>0		beshort		x		\b, size=%d
+#>2		beshort		x		\b, components=%d
+>4		pstring/H	x		\b, realm=%s
+>>&0		pstring/H	x		\b, principal=%s/
+>>>&0		pstring/H	x		\b%s
+>>>>&0		belong		x		\b, type=%d
+>>>>>&0		bedate		x		\b, date=%s
+>>>>>>&0	byte		x		\b, kvno=%u
+#>>>>>>>&0	pstring/H	x
+#>>>>>>>>&0	belong		x	
+#>>>>>>>>>>&0	use		keytab_entry
+
+0		belong		0x05020000	Kerberos Keytab file
+>4		use		keytab_entry
diff --git a/magic/Makefile.am b/magic/Makefile.am
index 15d81971..22972e0b 100644
--- a/magic/Makefile.am
+++ b/magic/Makefile.am
@@ -1,5 +1,5 @@
 #
-# $File: Makefile.am,v 1.99 2014/08/04 06:26:16 christos Exp $
+# $File: Makefile.am,v 1.100 2014/12/10 18:45:43 christos Exp $
 #
 MAGIC_FRAGMENT_BASE = Magdir
 MAGIC_DIR = $(top_srcdir)/magic
@@ -117,6 +117,7 @@ $(MAGIC_FRAGMENT_DIR)/jpeg \
 $(MAGIC_FRAGMENT_DIR)/karma \
 $(MAGIC_FRAGMENT_DIR)/kde \
 $(MAGIC_FRAGMENT_DIR)/keepass \
+$(MAGIC_FRAGMENT_DIR)/kerberos \
 $(MAGIC_FRAGMENT_DIR)/kml \
 $(MAGIC_FRAGMENT_DIR)/lecter \
 $(MAGIC_FRAGMENT_DIR)/lex \