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sd-dhcp6-client: support custom DUIDs

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The caller may have an existing DUID that it wants to use, and may
want to use some other DUID generation scheme than systemd's
default DUID-EN.

[tomegun: whitespace - we never use tabs]
This commit is contained in:
Dan Williams 2014-09-26 15:12:36 -05:00 committed by Tom Gundersen
parent 995a1063db
commit 66eac1201a
2 changed files with 33 additions and 12 deletions
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43
src/libsystemd-network/sd-dhcp6-client.c
View File

@ -39,6 +39,8 @@
#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)
#define MAX_DUID_LEN 32
struct sd_dhcp6_client {
RefCount n_ref;
@ -62,12 +64,8 @@ struct sd_dhcp6_client {
sd_event_source *timeout_resend_expire;
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;
uint8_t duid[MAX_DUID_LEN];
size_t duid_len;
};
static const uint16_t default_req_opts[] = {
@ -147,6 +145,19 @@ int sd_dhcp6_client_set_mac(sd_dhcp6_client *client,
return 0;
}
int sd_dhcp6_client_set_duid(sd_dhcp6_client *client, uint8_t *duid,
size_t duid_len)
{
assert_return(client, -EINVAL);
assert_return(duid, -EINVAL);
assert_return(duid_len > 0 && duid_len <= MAX_DUID_LEN, -EINVAL);
memcpy(&client->duid, duid, duid_len);
client->duid_len = duid_len;
return 0;
}
int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client,
uint16_t option) {
size_t t;
@ -308,7 +319,7 @@ static int client_send_message(sd_dhcp6_client *client, usec_t time_now) {
return r;
r = dhcp6_option_append(&opt, &optlen, DHCP6_OPTION_CLIENTID,
sizeof(client->duid), &client->duid);
client->duid_len, &client->duid);
if (r < 0)
return r;
@ -616,7 +627,7 @@ static int client_parse_message(sd_dhcp6_client *client,
return -EINVAL;
}
if (optlen != sizeof(client->duid) ||
if (optlen != client->duid_len ||
memcmp(&client->duid, optval, optlen) != 0) {
log_dhcp6_client(client, "%s DUID does not match",
dhcp6_message_type_to_string(message->type));
@ -1116,9 +1127,16 @@ sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) {
return client;
}
struct duid_en {
uint16_t type; /* DHCP6_DUID_EN */
uint32_t pen;
uint8_t id[8];
} _packed_;
int sd_dhcp6_client_new(sd_dhcp6_client **ret)
{
_cleanup_dhcp6_client_unref_ sd_dhcp6_client *client = NULL;
struct duid_en *duid;
sd_id128_t machine_id;
int r;
size_t t;
@ -1138,8 +1156,9 @@ int sd_dhcp6_client_new(sd_dhcp6_client **ret)
client->fd = -1;
/* initialize DUID */
client->duid.type = htobe16(DHCP6_DUID_EN);
client->duid.pen = htobe32(SYSTEMD_PEN);
duid = (struct duid_en *) &client->duid;
duid->type = htobe16(DHCP6_DUID_EN);
duid->pen = htobe32(SYSTEMD_PEN);
r = sd_id128_get_machine(&machine_id);
if (r < 0)
@ -1147,8 +1166,8 @@ int sd_dhcp6_client_new(sd_dhcp6_client **ret)
/* 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);
siphash24(duid->id, &machine_id, sizeof(machine_id), HASH_KEY.bytes);
client->duid_len = sizeof (struct duid_en);
client->req_opts_len = ELEMENTSOF(default_req_opts);

2
src/systemd/sd-dhcp6-client.h
View File

@ -45,6 +45,8 @@ int sd_dhcp6_client_set_callback(sd_dhcp6_client *client,
int sd_dhcp6_client_set_index(sd_dhcp6_client *client, int interface_index);
int sd_dhcp6_client_set_mac(sd_dhcp6_client *client,
const struct ether_addr *mac_addr);
int sd_dhcp6_client_set_duid(sd_dhcp6_client *client, uint8_t *duid,
size_t duid_len);
int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client,
uint16_t option);