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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "dhcp-client-id-internal.h"
#include "iovec-util.h"
#include "unaligned.h"
#include "utf8.h"
int sd_dhcp_client_id_clear(sd_dhcp_client_id *client_id) {
assert_return(client_id, -EINVAL);
*client_id = (sd_dhcp_client_id) {};
return 0;
}
int sd_dhcp_client_id_is_set(const sd_dhcp_client_id *client_id) {
if (!client_id)
return false;
return client_id_size_is_valid(client_id->size);
}
int sd_dhcp_client_id_get(const sd_dhcp_client_id *client_id, uint8_t *ret_type, const void **ret_data, size_t *ret_size) {
assert_return(sd_dhcp_client_id_is_set(client_id), -EINVAL);
assert_return(ret_type, -EINVAL);
assert_return(ret_data, -EINVAL);
assert_return(ret_size, -EINVAL);
*ret_type = client_id->id.type;
*ret_data = client_id->id.data;
*ret_size = client_id->size - offsetof(typeof(client_id->id), data);
return 0;
}
int sd_dhcp_client_id_get_raw(const sd_dhcp_client_id *client_id, const void **ret_data, size_t *ret_size) {
assert_return(sd_dhcp_client_id_is_set(client_id), -EINVAL);
assert_return(ret_data, -EINVAL);
assert_return(ret_size, -EINVAL);
/* Unlike sd_dhcp_client_id_get(), this returns whole client ID including its type. */
*ret_data = client_id->raw;
*ret_size = client_id->size;
return 0;
}
int sd_dhcp_client_id_set(
sd_dhcp_client_id *client_id,
uint8_t type,
const void *data,
size_t data_size) {
assert_return(client_id, -EINVAL);
assert_return(data, -EINVAL);
if (!client_id_data_size_is_valid(data_size))
return -EINVAL;
client_id->id.type = type;
memcpy(client_id->id.data, data, data_size);
client_id->size = offsetof(typeof(client_id->id), data) + data_size;
return 0;
}
int sd_dhcp_client_id_set_raw(
sd_dhcp_client_id *client_id,
const void *data,
size_t data_size) {
assert_return(client_id, -EINVAL);
assert_return(data, -EINVAL);
/* Unlike sd_dhcp_client_id_set(), this takes whole client ID including its type. */
if (!client_id_size_is_valid(data_size))
return -EINVAL;
memcpy(client_id->raw, data, data_size);
client_id->size = data_size;
return 0;
}
int sd_dhcp_client_id_set_iaid_duid(
sd_dhcp_client_id *client_id,
uint32_t iaid,
sd_dhcp_duid *duid) {
assert_return(client_id, -EINVAL);
assert_return(duid, -EINVAL);
assert_return(sd_dhcp_duid_is_set(duid), -ESTALE);
client_id->id.type = 255;
unaligned_write_be32(&client_id->id.ns.iaid, iaid);
memcpy(&client_id->id.ns.duid, &duid->duid, duid->size);
client_id->size = offsetof(typeof(client_id->id), ns.duid) + duid->size;
return 0;
}
int sd_dhcp_client_id_to_string(const sd_dhcp_client_id *client_id, char **ret) {
_cleanup_free_ char *t = NULL;
size_t len;
int r;
assert_return(sd_dhcp_client_id_is_set(client_id), -EINVAL);
assert_return(ret, -EINVAL);
len = client_id->size - offsetof(typeof(client_id->id), data);
switch (client_id->id.type) {
case 0:
if (utf8_is_printable((char *) client_id->id.gen.data, len))
r = asprintf(&t, "%.*s", (int) len, client_id->id.gen.data);
else
r = asprintf(&t, "DATA");
break;
case 1:
if (len == sizeof_field(sd_dhcp_client_id, id.eth))
r = asprintf(&t, "%02x:%02x:%02x:%02x:%02x:%02x",
client_id->id.eth.haddr[0],
client_id->id.eth.haddr[1],
client_id->id.eth.haddr[2],
client_id->id.eth.haddr[3],
client_id->id.eth.haddr[4],
client_id->id.eth.haddr[5]);
else
r = asprintf(&t, "ETHER");
break;
case 2 ... 254:
r = asprintf(&t, "ARP/LL");
break;
case 255:
if (len < sizeof(uint32_t))
r = asprintf(&t, "IAID/DUID");
else {
uint32_t iaid = be32toh(client_id->id.ns.iaid);
/* TODO: check and stringify DUID */
r = asprintf(&t, "IAID:0x%x/DUID", iaid);
}
break;
default:
assert_not_reached();
}
if (r < 0)
return -ENOMEM;
*ret = TAKE_PTR(t);
return 0;
}
int sd_dhcp_client_id_to_string_from_raw(const void *data, size_t data_size, char **ret) {
sd_dhcp_client_id client_id;
int r;
assert_return(data, -EINVAL);
assert_return(ret, -EINVAL);
r = sd_dhcp_client_id_set_raw(&client_id, data, data_size);
if (r < 0)
return r;
return sd_dhcp_client_id_to_string(&client_id, ret);
}
void client_id_hash_func(const sd_dhcp_client_id *client_id, struct siphash *state) {
assert(sd_dhcp_client_id_is_set(client_id));
assert(state);
siphash24_compress_typesafe(client_id->size, state);
siphash24_compress(client_id->raw, client_id->size, state);
}
int client_id_compare_func(const sd_dhcp_client_id *a, const sd_dhcp_client_id *b) {
assert(sd_dhcp_client_id_is_set(a));
assert(sd_dhcp_client_id_is_set(b));
return memcmp_nn(a->raw, a->size, b->raw, b->size);
}
int json_dispatch_client_id(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
sd_dhcp_client_id *client_id = ASSERT_PTR(userdata);
_cleanup_(iovec_done) struct iovec iov = {};
int r;
r = json_dispatch_byte_array_iovec(name, variant, flags, &iov);
if (r < 0)
return r;
r = sd_dhcp_client_id_set_raw(client_id, iov.iov_base, iov.iov_len);
if (r < 0)
return json_log(variant, flags, r, "Failed to set DHCP client ID from JSON field '%s': %m", strna(name));
return 0;
}
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