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#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;
}
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