int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) {
sd_id128_t machine_id;
int r;
assert(duid);
assert(len);
r = sd_id128_get_machine(&machine_id);
if (r < 0)
return r;
unaligned_write_be16(&duid->type, DHCP6_DUID_EN);
unaligned_write_be32(&duid->en.pen, SYSTEMD_PEN);
*len = sizeof(duid->type) + sizeof(duid->en);
/* a bit of snake-oil perhaps, but no need to expose the machine-id
directly */
siphash24(duid->en.id, &machine_id, sizeof(machine_id), HASH_KEY.bytes);
return 0;
}
int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) {
sd_id128_t machine_id;
uint64_t hash;
int r;
assert(duid);
assert(len);
r = sd_id128_get_machine(&machine_id);
if (r < 0)
return r;
unaligned_write_be16(&duid->type, DUID_TYPE_EN);
unaligned_write_be32(&duid->en.pen, SYSTEMD_PEN);
*len = sizeof(duid->type) + sizeof(duid->en);
/* a bit of snake-oil perhaps, but no need to expose the machine-id
directly; duid->en.id might not be aligned, so we need to copy */
hash = htole64(siphash24(&machine_id, sizeof(machine_id), HASH_KEY.bytes));
memcpy(duid->en.id, &hash, sizeof(duid->en.id));
return 0;
}
static void test_be(void) {
uint8_t scratch[16];
assert_se(unaligned_read_be16(&data[0]) == 0x0001);
assert_se(unaligned_read_be16(&data[1]) == 0x0102);
assert_se(unaligned_read_be32(&data[0]) == 0x00010203);
assert_se(unaligned_read_be32(&data[1]) == 0x01020304);
assert_se(unaligned_read_be32(&data[2]) == 0x02030405);
assert_se(unaligned_read_be32(&data[3]) == 0x03040506);
assert_se(unaligned_read_be64(&data[0]) == 0x0001020304050607);
assert_se(unaligned_read_be64(&data[1]) == 0x0102030405060708);
assert_se(unaligned_read_be64(&data[2]) == 0x0203040506070809);
assert_se(unaligned_read_be64(&data[3]) == 0x030405060708090a);
assert_se(unaligned_read_be64(&data[4]) == 0x0405060708090a0b);
assert_se(unaligned_read_be64(&data[5]) == 0x05060708090a0b0c);
assert_se(unaligned_read_be64(&data[6]) == 0x060708090a0b0c0d);
assert_se(unaligned_read_be64(&data[7]) == 0x0708090a0b0c0d0e);
zero(scratch);
unaligned_write_be16(&scratch[0], 0x0001);
assert_se(memcmp(&scratch[0], &data[0], sizeof(uint16_t)) == 0);
zero(scratch);
unaligned_write_be16(&scratch[1], 0x0102);
assert_se(memcmp(&scratch[1], &data[1], sizeof(uint16_t)) == 0);
zero(scratch);
unaligned_write_be32(&scratch[0], 0x00010203);
assert_se(memcmp(&scratch[0], &data[0], sizeof(uint32_t)) == 0);
zero(scratch);
unaligned_write_be32(&scratch[1], 0x01020304);
assert_se(memcmp(&scratch[1], &data[1], sizeof(uint32_t)) == 0);
zero(scratch);
unaligned_write_be32(&scratch[2], 0x02030405);
assert_se(memcmp(&scratch[2], &data[2], sizeof(uint32_t)) == 0);
zero(scratch);
unaligned_write_be32(&scratch[3], 0x03040506);
assert_se(memcmp(&scratch[3], &data[3], sizeof(uint32_t)) == 0);
zero(scratch);
unaligned_write_be64(&scratch[0], 0x0001020304050607);
assert_se(memcmp(&scratch[0], &data[0], sizeof(uint64_t)) == 0);
zero(scratch);
unaligned_write_be64(&scratch[1], 0x0102030405060708);
assert_se(memcmp(&scratch[1], &data[1], sizeof(uint64_t)) == 0);
zero(scratch);
unaligned_write_be64(&scratch[2], 0x0203040506070809);
assert_se(memcmp(&scratch[2], &data[2], sizeof(uint64_t)) == 0);
zero(scratch);
unaligned_write_be64(&scratch[3], 0x030405060708090a);
assert_se(memcmp(&scratch[3], &data[3], sizeof(uint64_t)) == 0);
zero(scratch);
unaligned_write_be64(&scratch[4], 0x0405060708090a0b);
assert_se(memcmp(&scratch[4], &data[4], sizeof(uint64_t)) == 0);
zero(scratch);
unaligned_write_be64(&scratch[5], 0x05060708090a0b0c);
assert_se(memcmp(&scratch[5], &data[5], sizeof(uint64_t)) == 0);
zero(scratch);
unaligned_write_be64(&scratch[6], 0x060708090a0b0c0d);
assert_se(memcmp(&scratch[6], &data[6], sizeof(uint64_t)) == 0);
zero(scratch);
unaligned_write_be64(&scratch[7], 0x0708090a0b0c0d0e);
assert_se(memcmp(&scratch[7], &data[7], sizeof(uint64_t)) == 0);
}
