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added hio_ipad_bytes_is_loop_back(), hio_pad_bytes_is_link_local()

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This commit is contained in:
hyung-hwan 2021-07-24 04:06:00 +00:00
parent b54f96d8c3
commit 1d8363f1c7
2 changed files with 69 additions and 0 deletions
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14
hio/lib/hio-skad.h
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@ -228,6 +228,20 @@ HIO_EXPORT int hio_bchars_to_ipad_bytes (
hio_oow_t blen
);
HIO_EXPORT int hio_ipad_bytes_is_v4_mapped (
const hio_uint8_t* iptr,
hio_oow_t ilen
);
HIO_EXPORT int hio_ipad_bytes_is_loop_back (
const hio_uint8_t* iptr,
hio_oow_t ilen
);
HIO_EXPORT int hio_ipad_bytes_is_link_local (
const hio_uint8_t* iptr,
hio_oow_t ilen
);
#if defined(__cplusplus)
}

55
hio/lib/skad.c
View File

@ -1594,3 +1594,58 @@ int hio_bchars_to_ipad_bytes (const hio_bch_t* str, hio_oow_t slen, hio_uint8_t*
return -1;
}
int hio_ipad_bytes_is_v4_mapped (const hio_uint8_t* iptr, hio_oow_t ilen)
{
if (ilen != HIO_IP6AD_LEN) return 0;
return iptr[0] == 0x00 && iptr[1] == 0x00 &&
iptr[2] == 0x00 && iptr[3] == 0x00 &&
iptr[4] == 0x00 && iptr[5] == 0x00 &&
iptr[6] == 0x00 && iptr[7] == 0x00 &&
iptr[8] == 0x00 && iptr[9] == 0x00 &&
iptr[10] == 0xFF && iptr[11] == 0xFF;
}
int hio_ipad_bytes_is_loop_back (const hio_uint8_t* iptr, hio_oow_t ilen)
{
switch (ilen)
{
case HIO_IP4AD_LEN:
{
// 127.0.0.0/8
return iptr[0] == 0x7F;
}
case HIO_IP6AD_LEN:
{
hio_uint32_t* x = (hio_uint32_t*)iptr;
return (x[0] == 0 && x[1] == 0 && x[2] == 0 && x[3] == HIO_CONST_HTON32(1)) || /* TODO: is this alignment safe? */
(hio_ipad_bytes_is_v4_mapped(iptr, ilen) && (x[3] & HIO_CONST_HTON32(0xFF000000u)) == HIO_CONST_HTON32(0x7F000000u));
}
default:
return 0;
}
}
int hio_ipad_bytes_is_link_local (const hio_uint8_t* iptr, hio_oow_t ilen)
{
switch (ilen)
{
case HIO_IP4AD_LEN:
{
// 169.254.0.0/16
return iptr[0] == 0xA9 && iptr[1] == 0xFE;
}
case HIO_IP6AD_LEN:
{
/* FE80::/10 */
return iptr[0] == 0xFE && (iptr[1] & 0xC0) == 0x80;
}
default:
return 0;
}
}