|
 |
f9ed25 |
From 2f6b827e89305adcff45288c632785ac054adb8e Mon Sep 17 00:00:00 2001
|
|
|
f9ed25 |
From: Pavel Zhukov <pzhukov@redhat.com>
|
|
|
f9ed25 |
Date: Thu, 21 Feb 2019 10:36:30 +0100
|
|
|
f9ed25 |
Subject: [PATCH 16/26] Turn on creating/sending of DUID
|
|
|
f9ed25 |
Cc: pzhukov@redhat.com
|
|
|
f9ed25 |
|
|
|
f9ed25 |
as client identifier with DHCPv4 clients (#560361c#40, rfc4361)
|
|
|
f9ed25 |
---
|
|
|
f9ed25 |
client/dhclient.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
|
|
|
f9ed25 |
1 file changed, 70 insertions(+), 4 deletions(-)
|
|
|
f9ed25 |
|
|
|
f9ed25 |
diff --git a/client/dhclient.c b/client/dhclient.c
|
|
|
f9ed25 |
index 8e57da9..ccc98e4 100644
|
|
|
f9ed25 |
--- a/client/dhclient.c
|
|
|
f9ed25 |
+++ b/client/dhclient.c
|
|
|
f9ed25 |
@@ -4021,6 +4021,59 @@ write_options(struct client_state *client, struct option_state *options,
|
|
|
f9ed25 |
}
|
|
|
f9ed25 |
}
|
|
|
f9ed25 |
|
|
|
f9ed25 |
+int unhexchar(char c) {
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ if (c >= '0' && c <= '9')
|
|
|
f9ed25 |
+ return c - '0';
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ if (c >= 'a' && c <= 'f')
|
|
|
f9ed25 |
+ return c - 'a' + 10;
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ if (c >= 'A' && c <= 'F')
|
|
|
f9ed25 |
+ return c - 'A' + 10;
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ return -1;
|
|
|
f9ed25 |
+}
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+isc_result_t
|
|
|
f9ed25 |
+read_uuid(u_int8_t* uuid) {
|
|
|
f9ed25 |
+ const char *id_fname = "/etc/machine-id";
|
|
|
f9ed25 |
+ char id[32];
|
|
|
f9ed25 |
+ size_t nread;
|
|
|
f9ed25 |
+ FILE * file = fopen( id_fname , "r");
|
|
|
f9ed25 |
+ if (!file) {
|
|
|
f9ed25 |
+ log_debug("Cannot open %s", id_fname);
|
|
|
f9ed25 |
+ return ISC_R_IOERROR;
|
|
|
f9ed25 |
+ }
|
|
|
f9ed25 |
+ nread = fread(id, 1, sizeof id, file);
|
|
|
f9ed25 |
+ fclose(file);
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ if (nread < 32) {
|
|
|
f9ed25 |
+ log_debug("Not enough data in %s", id_fname);
|
|
|
f9ed25 |
+ return ISC_R_IOERROR;
|
|
|
f9ed25 |
+ }
|
|
|
f9ed25 |
+ int j;
|
|
|
f9ed25 |
+ for (j = 0; j < 16; j++) {
|
|
|
f9ed25 |
+ int a, b;
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ a = unhexchar(id[j*2]);
|
|
|
f9ed25 |
+ b = unhexchar(id[j*2+1]);
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ if (a < 0 || b < 0) {
|
|
|
f9ed25 |
+ log_debug("Wrong data in %s", id_fname);
|
|
|
f9ed25 |
+ return ISC_R_IOERROR;
|
|
|
f9ed25 |
+ }
|
|
|
f9ed25 |
+ uuid[j] = a << 4 | b;
|
|
|
f9ed25 |
+ }
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ /* Set UUID version to 4 --- truly random generation */
|
|
|
f9ed25 |
+ uuid[6] = (uuid[6] & 0x0F) | 0x40;
|
|
|
f9ed25 |
+ /* Set the UUID variant to DCE */
|
|
|
f9ed25 |
+ uuid[8] = (uuid[8] & 0x3F) | 0x80;
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ return ISC_R_SUCCESS;
|
|
|
f9ed25 |
+}
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
/*
|
|
|
f9ed25 |
* The "best" default DUID, since we cannot predict any information
|
|
|
f9ed25 |
* about the system (such as whether or not the hardware addresses are
|
|
|
f9ed25 |
@@ -4041,6 +4094,7 @@ form_duid(struct data_string *duid, const char *file, int line)
|
|
|
f9ed25 |
struct interface_info *ip;
|
|
|
f9ed25 |
int len;
|
|
|
f9ed25 |
char *str;
|
|
|
f9ed25 |
+ u_int8_t uuid[16];
|
|
|
f9ed25 |
|
|
|
f9ed25 |
/* For now, just use the first interface on the list. */
|
|
|
f9ed25 |
ip = interfaces;
|
|
|
f9ed25 |
@@ -4061,9 +4115,16 @@ form_duid(struct data_string *duid, const char *file, int line)
|
|
|
f9ed25 |
(ip->hw_address.hlen > sizeof(ip->hw_address.hbuf)))
|
|
|
f9ed25 |
log_fatal("Impossible hardware address length at %s:%d.", MDL);
|
|
|
f9ed25 |
|
|
|
f9ed25 |
- if (duid_type == 0)
|
|
|
f9ed25 |
- duid_type = stateless ? DUID_LL : DUID_LLT;
|
|
|
f9ed25 |
-
|
|
|
f9ed25 |
+ if (duid_type == 0) {
|
|
|
f9ed25 |
+ if (read_uuid(uuid) == ISC_R_SUCCESS)
|
|
|
f9ed25 |
+ duid_type = DUID_UUID;
|
|
|
f9ed25 |
+ else
|
|
|
f9ed25 |
+ duid_type = stateless ? DUID_LL : DUID_LLT;
|
|
|
f9ed25 |
+ }
|
|
|
f9ed25 |
+
|
|
|
f9ed25 |
+ if (duid_type == DUID_UUID)
|
|
|
f9ed25 |
+ len = 2 + sizeof (uuid);
|
|
|
f9ed25 |
+ else {
|
|
|
f9ed25 |
/*
|
|
|
f9ed25 |
* 2 bytes for the 'duid type' field.
|
|
|
f9ed25 |
* 2 bytes for the 'htype' field.
|
|
|
f9ed25 |
@@ -4074,13 +4135,18 @@ form_duid(struct data_string *duid, const char *file, int line)
|
|
|
f9ed25 |
len = 4 + (ip->hw_address.hlen - 1);
|
|
|
f9ed25 |
if (duid_type == DUID_LLT)
|
|
|
f9ed25 |
len += 4;
|
|
|
f9ed25 |
+ }
|
|
|
f9ed25 |
if (!buffer_allocate(&duid->buffer, len, MDL))
|
|
|
f9ed25 |
log_fatal("no memory for default DUID!");
|
|
|
f9ed25 |
duid->data = duid->buffer->data;
|
|
|
f9ed25 |
duid->len = len;
|
|
|
f9ed25 |
|
|
|
f9ed25 |
+ if (duid_type == DUID_UUID) {
|
|
|
f9ed25 |
+ putUShort(duid->buffer->data, DUID_UUID);
|
|
|
f9ed25 |
+ memcpy(duid->buffer->data + 2, uuid, sizeof(uuid));
|
|
|
f9ed25 |
+ }
|
|
|
f9ed25 |
/* Basic Link Local Address type of DUID. */
|
|
|
f9ed25 |
- if (duid_type == DUID_LLT) {
|
|
|
f9ed25 |
+ else if (duid_type == DUID_LLT) {
|
|
|
f9ed25 |
putUShort(duid->buffer->data, DUID_LLT);
|
|
|
f9ed25 |
putUShort(duid->buffer->data + 2, ip->hw_address.hbuf[0]);
|
|
|
f9ed25 |
putULong(duid->buffer->data + 4, cur_time - DUID_TIME_EPOCH);
|
|
|
f9ed25 |
--
|
|
|
f9ed25 |
2.14.5
|
|
|
f9ed25 |
|