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1.1 misho 1: /*
2: * Copyright (C) 2011 Martin Willi
3: * Copyright (C) 2011 revosec AG
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #include <stddef.h>
17:
18: #include "hash_payload.h"
19:
20: #include <encoding/payloads/encodings.h>
21:
22: typedef struct private_hash_payload_t private_hash_payload_t;
23:
24: /**
25: * Private data of an hash_payload_t object.
26: */
27: struct private_hash_payload_t {
28:
29: /**
30: * Public hash_payload_t interface.
31: */
32: hash_payload_t public;
33:
34: /**
35: * Next payload type.
36: */
37: uint8_t next_payload;
38:
39: /**
40: * Reserved byte
41: */
42: uint8_t reserved;
43:
44: /**
45: * Length of this payload.
46: */
47: uint16_t payload_length;
48:
49: /**
50: * The contained hash value.
51: */
52: chunk_t hash;
53:
54: /**
55: * either PLV1_HASH or PLV1_NAT_D
56: */
57: payload_type_t type;
58: };
59:
60: /**
61: * Encoding rules for an IKEv1 hash payload
62: */
63: static encoding_rule_t encodings[] = {
64: /* 1 Byte next payload type, stored in the field next_payload */
65: { U_INT_8, offsetof(private_hash_payload_t, next_payload) },
66: { RESERVED_BYTE, offsetof(private_hash_payload_t, reserved) },
67: /* Length of the whole payload*/
68: { PAYLOAD_LENGTH, offsetof(private_hash_payload_t, payload_length) },
69: /* Hash Data is from variable size */
70: { CHUNK_DATA, offsetof(private_hash_payload_t, hash) },
71: };
72:
73: /*
74: 1 2 3
75: 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
76: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
77: ! Next Payload ! RESERVED ! Payload Length !
78: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
79: ! !
80: ~ Hash Data ~
81: ! !
82: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
83: */
84:
85: METHOD(payload_t, verify, status_t,
86: private_hash_payload_t *this)
87: {
88: return SUCCESS;
89: }
90:
91: METHOD(payload_t, get_encoding_rules, int,
92: private_hash_payload_t *this, encoding_rule_t **rules)
93: {
94: *rules = encodings;
95: return countof(encodings);
96: }
97:
98: METHOD(payload_t, get_header_length, int,
99: private_hash_payload_t *this)
100: {
101: return 4;
102: }
103:
104: METHOD(payload_t, get_type, payload_type_t,
105: private_hash_payload_t *this)
106: {
107: return this->type;
108: }
109:
110: METHOD(payload_t, get_next_type, payload_type_t,
111: private_hash_payload_t *this)
112: {
113: return this->next_payload;
114: }
115:
116: METHOD(payload_t, set_next_type, void,
117: private_hash_payload_t *this, payload_type_t type)
118: {
119: this->next_payload = type;
120: }
121:
122: METHOD(payload_t, get_length, size_t,
123: private_hash_payload_t *this)
124: {
125: return this->payload_length;
126: }
127:
128: METHOD(hash_payload_t, set_hash, void,
129: private_hash_payload_t *this, chunk_t hash)
130: {
131: free(this->hash.ptr);
132: this->hash = chunk_clone(hash);
133: this->payload_length = get_header_length(this) + hash.len;
134: }
135:
136: METHOD(hash_payload_t, get_hash, chunk_t,
137: private_hash_payload_t *this)
138: {
139: return this->hash;
140: }
141:
142: METHOD2(payload_t, hash_payload_t, destroy, void,
143: private_hash_payload_t *this)
144: {
145: free(this->hash.ptr);
146: free(this);
147: }
148:
149: /*
150: * Described in header
151: */
152: hash_payload_t *hash_payload_create(payload_type_t type)
153: {
154: private_hash_payload_t *this;
155:
156: INIT(this,
157: .public = {
158: .payload_interface = {
159: .verify = _verify,
160: .get_encoding_rules = _get_encoding_rules,
161: .get_header_length = _get_header_length,
162: .get_length = _get_length,
163: .get_next_type = _get_next_type,
164: .set_next_type = _set_next_type,
165: .get_type = _get_type,
166: .destroy = _destroy,
167: },
168: .set_hash = _set_hash,
169: .get_hash = _get_hash,
170: .destroy = _destroy,
171: },
172: .next_payload = PL_NONE,
173: .payload_length = get_header_length(this),
174: .type = type,
175: );
176: return &this->public;
177: }