2 * Helpers for ASN.1/BER dissection
3 * Ronnie Sahlberg (C) 2004
7 * Ethereal - Network traffic analyzer
8 * By Gerald Combs <gerald@ethereal.com>
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/to_str.h>
31 #define BER_NOT_DECODED_YET(x) \
32 proto_tree_add_text(tree, tvb, offset, 0, "something unknown here [%s]",x); \
33 fprintf(stderr,"Not decoded yet in packet : %d [%s]\n", pinfo->fd->num,x); \
34 if (check_col(pinfo->cinfo, COL_INFO)){ \
35 col_append_fstr(pinfo->cinfo, COL_INFO, "[UNKNOWN BER: %s]", x); \
37 tvb_get_guint8(tvb, 9999);
39 typedef int (*ber_callback)(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset);
41 #define BER_CLASS_UNI 0
42 #define BER_CLASS_APP 1
43 #define BER_CLASS_CON 2
44 #define BER_CLASS_PRI 3
45 #define BER_CLASS_ANY 99 /* dont check class nor tag */
47 #define BER_UNI_TAG_EOC 0 /* 'end-of-content' */
48 #define BER_UNI_TAG_BOOLEAN 1
49 #define BER_UNI_TAG_INTEGER 2
50 #define BER_UNI_TAG_BITSTRING 3
51 #define BER_UNI_TAG_OCTETSTRING 4
52 #define BER_UNI_TAG_NULL 5
53 #define BER_UNI_TAG_OID 6 /* OBJECT IDENTIFIER */
54 #define BER_UNI_TAG_ObjectDescriptor 7
55 #define BER_UNI_TAG_REAL 9
56 #define BER_UNI_TAG_ENUMERATED 10
57 #define BER_UNI_TAG_EMBEDDED_PDV 11
58 #define BER_UNI_TAG_UTF8String 12
59 #define BER_UNI_TAG_RELATIVE_OID 13
60 #define BER_UNI_TAG_SEQUENCE 16 /* SEQUENCE, SEQUENCE OF */
61 #define BER_UNI_TAG_SET 17 /* SET, SET OF */
62 #define BER_UNI_TAG_NumericString 18
63 #define BER_UNI_TAG_PrintableString 19
64 #define BER_UNI_TAG_TeletexString 20 /* TeletextString, T61String */
65 #define BER_UNI_TAG_VideotexString 21
66 #define BER_UNI_TAG_IA5String 22
67 #define BER_UNI_TAG_UTCTime 23
68 #define BER_UNI_TAG_GeneralizedTime 24
69 #define BER_UNI_TAG_GraphicString 25
70 #define BER_UNI_TAG_VisibleString 26 /* VisibleString, ISO64String */
71 #define BER_UNI_TAG_GeneralString 27
72 #define BER_UNI_TAG_UniversalString 28
73 #define BER_UNI_TAG_CHARACTERSTRING 29
74 #define BER_UNI_TAG_BMPString 30
76 #define BER_MAX_OID_STR_LEN MAX_OID_STR_LEN
78 /* this function dissects the identifier octer of the BER TLV.
79 * We only handle TAGs (and LENGTHs) that fit inside 32 bit integers.
81 extern int get_ber_identifier(tvbuff_t *tvb, int offset, gint8 *class, gboolean *pc, gint32 *tag);
82 extern int dissect_ber_identifier(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint8 *class, gboolean *pc, gint32 *tag);
83 extern int dissect_unknown_ber(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
84 /* this function dissects the identifier octer of the BER TLV.
85 * We only handle (TAGs and) LENGTHs that fit inside 32 bit integers.
87 extern int get_ber_length(proto_tree *tree, tvbuff_t *tvb, int offset, guint32 *length, gboolean *ind);
88 extern int dissect_ber_length(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, guint32 *length, gboolean *ind);
90 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);
91 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);
93 extern int dissect_ber_integer(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id, guint32 *value);
95 extern int dissect_ber_null(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id);
97 extern int dissect_ber_boolean(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id);
100 #define BER_FLAGS_OPTIONAL 0x00000001
101 #define BER_FLAGS_IMPLTAG 0x00000002
102 #define BER_FLAGS_NOOWNTAG 0x00000004
103 #define BER_FLAGS_NOTCHKTAG 0x00000008
104 typedef struct _ber_sequence_t {
111 /* this function dissects a BER sequence
113 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);
114 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);
117 typedef struct _ber_choice_t {
126 /* this function dissects a BER choice
128 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);
131 /* this function dissects a BER strings
133 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);
134 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);
137 /* this function dissects a BER Object Identifier
139 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);
140 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);
142 /* this function dissects a BER sequence of
144 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);
146 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);
149 extern int dissect_ber_GeneralizedTime(gboolean implicit_tag, packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, int offset, gint hf_id);
151 typedef struct _asn_namedbit {
154 gint32 gb0; /* the 1st bit of "bit group", -1 = the 1st bit of current byte */
155 gint32 gb1; /* last bit of "bit group", -1 = last bit of current byte */
156 const gchar *tstr; /* true string */
157 const gchar *fstr; /* false string */
159 /* this function dissects a BER BIT-STRING
161 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);
162 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);
165 extern proto_item *ber_last_created_item;
166 extern proto_item *get_ber_last_created_item(void);
168 int call_ber_oid_callback(const char *oid, tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree);
169 void register_ber_oid_dissector_handle(const char *oid, dissector_handle_t dissector, int proto, const char *name);
170 void register_ber_oid_dissector(const char *oid, dissector_t dissector, int proto, const char *name);
171 void register_ber_oid_name(const char *oid, const char *name);
172 void dissect_ber_oid_NULL_callback(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
173 const char * get_ber_oid_name(const char *str);
175 #endif /* __PACKET_BER_H__ */