Annotation of embedaddon/strongswan/src/conftest/hooks/set_length.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2010 Martin Willi
3: * Copyright (C) 2010 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 "hook.h"
17:
18: typedef struct private_set_length_t private_set_length_t;
19:
20: /**
21: * Private data of an set_length_t object.
22: */
23: struct private_set_length_t {
24:
25: /**
26: * Implements the hook_t interface.
27: */
28: hook_t hook;
29:
30: /**
31: * Alter requests or responses?
32: */
33: bool req;
34:
35: /**
36: * ID of message to alter.
37: */
38: int id;
39:
40: /**
41: * Payload type
42: */
43: char *type;
44:
45: /**
46: * Difference to correct length
47: */
48: int diff;
49: };
50:
51: METHOD(listener_t, message, bool,
52: private_set_length_t *this, ike_sa_t *ike_sa, message_t *message,
53: bool incoming, bool plain)
54: {
55: if (!incoming && plain &&
56: message->get_request(message) == this->req &&
57: message->get_message_id(message) == this->id)
58: {
59: payload_t *payload;
60: enumerator_t *enumerator;
61: payload_type_t type;
62:
63: type = atoi(this->type);
64: if (!type)
65: {
66: if (!enum_from_name(payload_type_short_names, this->type, &type))
67: {
68: DBG1(DBG_CFG, "unknown payload: '%s', skipped", this->type);
69: return TRUE;
70: }
71: }
72: enumerator = message->create_payload_enumerator(message);
73: while (enumerator->enumerate(enumerator, &payload))
74: {
75: if (type == payload->get_type(payload))
76: {
77: encoding_rule_t *rules;
78: uint16_t *len;
79: int i, count;
80:
81: count = payload->get_encoding_rules(payload, &rules);
82: for (i = 0; i < count; i++)
83: {
84: if (rules[i].type == PAYLOAD_LENGTH)
85: {
86: len = (uint16_t*)(((void*)payload) + rules[i].offset);
87: DBG1(DBG_CFG, "adjusting length of %N payload "
88: "from %d to %d", payload_type_short_names, type,
89: *len, *len + this->diff);
90: *len = *len + this->diff;
91: }
92: }
93: }
94: }
95: enumerator->destroy(enumerator);
96: }
97: return TRUE;
98: }
99:
100: METHOD(hook_t, destroy, void,
101: private_set_length_t *this)
102: {
103: free(this);
104: }
105:
106: /**
107: * Create the IKE_AUTH fill hook
108: */
109: hook_t *set_length_hook_create(char *name)
110: {
111: private_set_length_t *this;
112:
113: INIT(this,
114: .hook = {
115: .listener = {
116: .message = _message,
117: },
118: .destroy = _destroy,
119: },
120: .req = conftest->test->get_bool(conftest->test,
121: "hooks.%s.request", TRUE, name),
122: .id = conftest->test->get_int(conftest->test,
123: "hooks.%s.id", 0, name),
124: .type = conftest->test->get_str(conftest->test,
125: "hooks.%s.type", "", name),
126: .diff = conftest->test->get_int(conftest->test,
127: "hooks.%s.diff", 0, name),
128: );
129:
130: return &this->hook;
131: }
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