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sd-dhcp6-client: Initialize DUID

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Initialize DHCP Unique Identifier when creating the client. The
DUID is generated based on the machine-id, which satisfies all the
requirements of what an DUID should be. The DUID type is DUID-EN.

Based on patch by Patrik Flykt.
This commit is contained in:
Tom Gundersen 2014-06-19 15:39:01 +03:00 committed by Patrik Flykt
parent f20a35cc0d
commit a276e6d686
1 changed files with 25 additions and 0 deletions
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25
src/libsystemd-network/sd-dhcp6-client.c
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@ -22,12 +22,16 @@
#include <errno.h>
#include <string.h>
#include "siphash24.h"
#include "util.h"
#include "refcnt.h"
#include "sd-dhcp6-client.h"
#include "dhcp6-protocol.h"
#define SYSTEMD_PEN 43793
#define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09)
struct sd_dhcp6_client {
RefCount n_ref;
@ -38,6 +42,12 @@ struct sd_dhcp6_client {
struct ether_addr mac_addr;
sd_dhcp6_client_cb_t cb;
void *userdata;
struct duid_en {
uint16_t type; /* DHCP6_DUID_EN */
uint32_t pen;
uint8_t id[8];
} _packed_ duid;
};
int sd_dhcp6_client_set_callback(sd_dhcp6_client *client,
@ -185,6 +195,8 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp6_client*, sd_dhcp6_client_unref);
int sd_dhcp6_client_new(sd_dhcp6_client **ret)
{
_cleanup_dhcp6_client_free_ sd_dhcp6_client *client = NULL;
sd_id128_t machine_id;
int r;
assert_return(ret, -EINVAL);
@ -196,6 +208,19 @@ int sd_dhcp6_client_new(sd_dhcp6_client **ret)
client->index = -1;
/* initialize DUID */
client->duid.type = htobe16(DHCP6_DUID_EN);
client->duid.pen = htobe32(SYSTEMD_PEN);
r = sd_id128_get_machine(&machine_id);
if (r < 0)
return r;
/* a bit of snake-oil perhaps, but no need to expose the machine-id
directly */
siphash24(client->duid.id, &machine_id, sizeof(machine_id),
HASH_KEY.bytes);
*ret = client;
client = NULL;