1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define OPT_X 42
#define OPT_Y 43
#define OPT_Z 44
static void *
encode_inet6_opt (socklen_t *elp)
{
void *eb = NULL;
socklen_t el;
int cl;
void *db;
int offset;
uint8_t val1;
uint16_t val2;
uint32_t val4;
uint64_t val8;
*elp = 0;
#define CHECK() \
if (cl == -1) \
{ \
printf ("cl == -1 on line %d\n", __LINE__); \
free (eb); \
return NULL; \
}
/* Estimate the length */
cl = inet6_opt_init (NULL, 0);
CHECK ();
cl = inet6_opt_append (NULL, 0, cl, OPT_X, 12, 8, NULL);
CHECK ();
cl = inet6_opt_append (NULL, 0, cl, OPT_Y, 7, 4, NULL);
CHECK ();
cl = inet6_opt_append (NULL, 0, cl, OPT_Z, 7, 1, NULL);
CHECK ();
cl = inet6_opt_finish (NULL, 0, cl);
CHECK ();
el = cl;
eb = malloc (el + 8);
if (eb == NULL)
{
puts ("malloc failed");
return NULL;
}
/* Canary. */
memcpy (eb + el, "deadbeef", 8);
cl = inet6_opt_init (eb, el);
CHECK ();
cl = inet6_opt_append (eb, el, cl, OPT_X, 12, 8, &db);
CHECK ();
val4 = 0x12345678;
offset = inet6_opt_set_val (db, 0, &val4, sizeof (val4));
val8 = 0x0102030405060708LL;
inet6_opt_set_val (db, offset, &val8, sizeof (val8));
cl = inet6_opt_append (eb, el, cl, OPT_Y, 7, 4, &db);
CHECK ();
val1 = 0x01;
offset = inet6_opt_set_val (db, 0, &val1, sizeof (val1));
val2 = 0x1331;
offset = inet6_opt_set_val (db, offset, &val2, sizeof (val2));
val4 = 0x01020304;
inet6_opt_set_val (db, offset, &val4, sizeof (val4));
cl = inet6_opt_append (eb, el, cl, OPT_Z, 7, 1, &db);
CHECK ();
inet6_opt_set_val (db, 0, (void *) "abcdefg", 7);
cl = inet6_opt_finish (eb, el, cl);
CHECK ();
if (memcmp (eb + el, "deadbeef", 8) != 0)
{
puts ("Canary corrupted");
free (eb);
return NULL;
}
*elp = el;
return eb;
}
int
decode_inet6_opt (void *eb, socklen_t el)
{
int ret = 0;
int seq = 0;
int cl = 0;
int offset;
uint8_t type;
socklen_t len;
uint8_t val1;
uint16_t val2;
uint32_t val4;
uint64_t val8;
void *db;
char buf[8];
while ((cl = inet6_opt_next (eb, el, cl, &type, &len, &db)) != -1)
switch (type)
{
case OPT_X:
if (seq++ != 0)
{
puts ("OPT_X is not first");
ret = 1;
}
if (len != 12)
{
printf ("OPT_X's length %d != 12\n", len);
ret = 1;
}
offset = inet6_opt_get_val (db, 0, &val4, sizeof (val4));
if (val4 != 0x12345678)
{
printf ("OPT_X's val4 %x != 0x12345678\n", val4);
ret = 1;
}
offset = inet6_opt_get_val (db, offset, &val8, sizeof (val8));
if (offset != len || val8 != 0x0102030405060708LL)
{
printf ("OPT_X's val8 %llx != 0x0102030405060708\n",
(long long) val8);
ret = 1;
}
break;
case OPT_Y:
if (seq++ != 1)
{
puts ("OPT_Y is not second");
ret = 1;
}
if (len != 7)
{
printf ("OPT_Y's length %d != 7\n", len);
ret = 1;
}
offset = inet6_opt_get_val (db, 0, &val1, sizeof (val1));
if (val1 != 0x01)
{
printf ("OPT_Y's val1 %x != 0x01\n", val1);
ret = 1;
}
offset = inet6_opt_get_val (db, offset, &val2, sizeof (val2));
if (val2 != 0x1331)
{
printf ("OPT_Y's val2 %x != 0x1331\n", val2);
ret = 1;
}
offset = inet6_opt_get_val (db, offset, &val4, sizeof (val4));
if (offset != len || val4 != 0x01020304)
{
printf ("OPT_Y's val4 %x != 0x01020304\n", val4);
ret = 1;
}
break;
case OPT_Z:
if (seq++ != 2)
{
puts ("OPT_Z is not third");
ret = 1;
}
if (len != 7)
{
printf ("OPT_Z's length %d != 7\n", len);
ret = 1;
}
offset = inet6_opt_get_val (db, 0, buf, 7);
if (offset != len || memcmp (buf, "abcdefg", 7) != 0)
{
buf[7] = '\0';
printf ("OPT_Z's buf \"%s\" != \"abcdefg\"\n", buf);
ret = 1;
}
break;
default:
printf ("Unknown option %d\n", type);
ret = 1;
break;
}
if (seq != 3)
{
puts ("Didn't see all of OPT_X, OPT_Y and OPT_Z");
ret = 1;
}
return ret;
}
int
main (void)
{
void *eb;
socklen_t el;
eb = encode_inet6_opt (&el);
if (eb == NULL)
return 1;
if (decode_inet6_opt (eb, el))
return 1;
return 0;
}
|
