diff options
| -rw-r--r-- | src/libsystemd-network/sd-dhcp6-client.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c index 5063d4a4c5..8718324c33 100644 --- a/src/libsystemd-network/sd-dhcp6-client.c +++ b/src/libsystemd-network/sd-dhcp6-client.c @@ -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; |