2 * Helpers for ASN.1/BER dissection
3 * Ronnie Sahlberg (C) 2004
7 * Wireshark - Network traffic analyzer
8 * By Gerald Combs <gerald@wireshark.org>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 #ifndef __PACKET_BER_H__
27 #define __PACKET_BER_H__
29 #include <epan/proto.h>
30 #include <epan/to_str.h>
32 #define BER_NOT_DECODED_YET(x) \
33 proto_tree_add_text(tree, tvb, offset, 0, "something unknown here [%s]",x); \
34 fprintf(stderr,"Not decoded yet in packet : %d [%s]\n", pinfo->fd->num,x); \
35 if (check_col(pinfo->cinfo, COL_INFO)){ \
36 col_append_fstr(pinfo->cinfo, COL_INFO, "[UNKNOWN BER: %s]", x); \
38 tvb_get_guint8(tvb, 9999);
40 typedef int (*ber_callback)(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset);
41 typedef int (*ber_type_fn)(gboolean, tvbuff_t*, int, packet_info*, proto_tree*, int);
44 #define BER_CLASS_UNI 0
45 #define BER_CLASS_APP 1
46 #define BER_CLASS_CON 2
47 #define BER_CLASS_PRI 3
48 #define BER_CLASS_ANY 99 /* dont check class nor tag */
50 #define BER_UNI_TAG_EOC 0 /* 'end-of-content' */
51 #define BER_UNI_TAG_BOOLEAN 1
52 #define BER_UNI_TAG_INTEGER 2
53 #define BER_UNI_TAG_BITSTRING 3
54 #define BER_UNI_TAG_OCTETSTRING 4
55 #define BER_UNI_TAG_NULL 5
56 #define BER_UNI_TAG_OID 6 /* OBJECT IDENTIFIER */
57 #define BER_UNI_TAG_ObjectDescriptor 7
58 #define BER_UNI_TAG_EXTERNAL 8
59 #define BER_UNI_TAG_REAL 9
60 #define BER_UNI_TAG_ENUMERATED 10
61 #define BER_UNI_TAG_EMBEDDED_PDV 11
62 #define BER_UNI_TAG_UTF8String 12
63 #define BER_UNI_TAG_RELATIVE_OID 13
65 * Reserved for future editions of this
66 * Recommendation | International Standard
68 #define BER_UNI_TAG_SEQUENCE 16 /* SEQUENCE, SEQUENCE OF */
69 #define BER_UNI_TAG_SET 17 /* SET, SET OF */
70 /* UNIVERSAL 18-22 Character string types */
71 #define BER_UNI_TAG_NumericString 18
72 #define BER_UNI_TAG_PrintableString 19
73 #define BER_UNI_TAG_TeletexString 20 /* TeletextString, T61String */
74 #define BER_UNI_TAG_VideotexString 21
75 #define BER_UNI_TAG_IA5String 22
76 /* UNIVERSAL 23-24 Time types */
77 #define BER_UNI_TAG_UTCTime 23
78 #define BER_UNI_TAG_GeneralizedTime 24
79 /* UNIVERSAL 25-30 Character string types */
80 #define BER_UNI_TAG_GraphicString 25
81 #define BER_UNI_TAG_VisibleString 26 /* VisibleString, ISO64String */
82 #define BER_UNI_TAG_GeneralString 27
83 #define BER_UNI_TAG_UniversalString 28
84 #define BER_UNI_TAG_CHARACTERSTRING 29
85 #define BER_UNI_TAG_BMPString 30
87 * Reserved for addenda to this Recommendation | International Standard
91 /* this function dissects the identifier octer of the BER TLV.
92 * We only handle TAGs (and LENGTHs) that fit inside 32 bit integers.
94 extern int get_ber_identifier(tvbuff_t *tvb, int offset, gint8 *class, gboolean *pc, gint32 *tag);
95 extern int dissect_ber_identifier(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint8 *class, gboolean *pc, gint32 *tag);
96 extern int dissect_unknown_ber(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
97 /* this function dissects the identifier octer of the BER TLV.
98 * We only handle (TAGs and) LENGTHs that fit inside 32 bit integers.
100 extern int get_ber_length(proto_tree *tree, tvbuff_t *tvb, int offset, guint32 *length, gboolean *ind);
101 extern int dissect_ber_length(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, guint32 *length, gboolean *ind);
103 extern int dissect_ber_tagged_type(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, gint8 tag_cls, gint32 tag_tag, gboolean tag_impl, ber_type_fn type);
105 extern int dissect_ber_octet_string(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, tvbuff_t **out_tvb);
106 extern int dissect_ber_octet_string_wcb(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, ber_callback func);
108 extern int dissect_ber_integer64(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, gint64 *value);
110 extern int dissect_ber_integer(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, guint32 *value);
112 extern int dissect_ber_null(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id);
114 extern int dissect_ber_boolean(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id);
115 extern int dissect_ber_boolean_value(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, gboolean *value);
118 #define BER_FLAGS_OPTIONAL 0x00000001
119 #define BER_FLAGS_IMPLTAG 0x00000002
120 #define BER_FLAGS_NOOWNTAG 0x00000004
121 #define BER_FLAGS_NOTCHKTAG 0x00000008
122 typedef struct _ber_sequence_t {
129 /* this function dissects a BER sequence
131 extern int dissect_ber_sequence(gboolean implicit_tag, packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset, const ber_sequence_t *seq, gint hf_id, gint ett_id);
132 extern int dissect_ber_set(gboolean implicit_tag, packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset, const ber_sequence_t *seq, gint hf_id, gint ett_id);
135 typedef struct _ber_choice_t {
144 /* this function dissects a BER choice
146 extern int dissect_ber_choice(packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset, const ber_choice_t *ch, gint hf_id, gint ett_id, gint *branch_taken);
149 /* this function dissects a BER strings
151 extern int dissect_ber_restricted_string(gboolean implicit_tag, gint32 type, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, tvbuff_t **out_tvb);
152 extern int dissect_ber_GeneralString(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, char *name_string, guint name_len);
155 /* this function dissects a BER Object Identifier
157 extern int dissect_ber_object_identifier(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, tvbuff_t **value_tvb);
158 extern int dissect_ber_object_identifier_str(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, const char **value_string);
160 /* this function dissects a BER sequence of
162 extern int dissect_ber_sequence_of(gboolean implicit_tag, packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset, const ber_sequence_t *seq, gint hf_id, gint ett_id);
164 extern int dissect_ber_set_of(gboolean implicit_tag, packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset, const ber_sequence_t *seq, gint hf_id, gint ett_id);
167 extern int dissect_ber_GeneralizedTime(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id);
169 typedef struct _asn_namedbit {
172 gint32 gb0; /* the 1st bit of "bit group", -1 = the 1st bit of current byte */
173 gint32 gb1; /* last bit of "bit group", -1 = last bit of current byte */
174 const gchar *tstr; /* true string */
175 const gchar *fstr; /* false string */
177 /* this function dissects a BER BIT-STRING
179 extern int dissect_ber_bitstring(gboolean implicit_tag, packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset, const asn_namedbit *named_bits, gint hf_id, gint ett_id, tvbuff_t **out_tvb);
180 extern int dissect_ber_bitstring32(gboolean implicit_tag, packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset, int **bit_fields, gint hf_id, gint ett_id, tvbuff_t **out_tvb);
183 extern proto_item *ber_last_created_item;
184 extern proto_item *get_ber_last_created_item(void);
186 int call_ber_oid_callback(const char *oid, tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree);
187 void register_ber_oid_dissector_handle(const char *oid, dissector_handle_t dissector, int proto, const char *name);
188 void register_ber_oid_dissector(const char *oid, dissector_t dissector, int proto, const char *name);
189 void register_ber_syntax_dissector(const char *oid, int proto, dissector_t dissector);
190 void register_ber_oid_name(const char *oid, const char *name);
191 void register_ber_oid_syntax(const char *oid, const char *name, const char *syntax);
192 void dissect_ber_oid_NULL_callback(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
194 void ber_decode_as_foreach(GHFunc func, gpointer user_data); /* iterate through known syntaxes */
195 void ber_decode_as(const gchar *syntax); /* decode the current capture as this syntax */
196 void ber_set_filename(gchar *filename); /* name of current BER-encoded file */
198 gboolean oid_has_dissector(const char *oid);
200 #endif /* __PACKET_BER_H__ */