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Reference: https://src.fedoraproject.org/rpms/dhcp/blob/rawhide/f/0023-option-97-pxe-client-id.patch
From f01a29a90269c98a86accb0923d65aecf5f59b44 Mon Sep 17 00:00:00 2001
From: Pavel Zhukov <[email protected]>
Date: Thu, 28 Feb 2019 16:40:38 +0100
Subject: [PATCH 23/28] option 97 - pxe-client-id
Bug-url: https://bugzilla.redhat.com/1058674
ISC-Bugs #38110
---
common/options.c | 27 ++++++++++++++++++++-------
common/tables.c | 3 ++-
includes/dhcp.h | 1 +
server/dhcp.c | 19 +++++++++++++++++++
server/dhcpd.conf.5 | 9 ++++++---
server/dhcpleasequery.c | 18 +++++++++++++++---
server/failover.c | 3 +++
server/mdb.c | 5 +++--
8 files changed, 69 insertions(+), 16 deletions(-)
diff --git a/common/options.c b/common/options.c
index 66433c4..4e26094 100644
--- a/common/options.c
+++ b/common/options.c
@@ -4551,13 +4551,26 @@ int validate_packet(struct packet *packet)
"a future version of ISC DHCP will reject this");
}
} else {
- /*
- * If hlen is 0 we don't have any identifier, we warn the user
- * but continue processing the packet as we can.
- */
- if (packet->raw->hlen == 0) {
- log_debug("Received DHCPv4 packet without client-id"
- " option and empty hlen field.");
+ oc = lookup_option (&dhcp_universe, packet->options,
+ DHO_PXE_CLIENT_ID);
+ if (oc) {
+ /* Let's check if pxe-client-id is sane */
+ if ((oc->data.len < 2) ||
+ (oc->data.data[0] == '\0' &&
+ oc->data.len != 17)) {
+ log_debug("Dropped DHCPv4 packet with wrong "
+ "(len == %d) pxe-client-id", oc->data.len);
+ return (0);
+ }
+ } else {
+ /*
+ * If hlen is 0 we don't have any identifier, we warn the user
+ * but continue processing the packet as we can.
+ */
+ if (packet->raw->hlen == 0) {
+ log_debug("Received DHCPv4 packet without client-id"
+ " option and empty hlen field.");
+ }
}
}
diff --git a/common/tables.c b/common/tables.c
index 96521a6..8034d94 100644
--- a/common/tables.c
+++ b/common/tables.c
@@ -200,8 +200,9 @@ static struct option dhcp_options[] = {
/* Defined by RFC 4578 */
{ "pxe-system-type", "Sa", &dhcp_universe, 93, 1 },
{ "pxe-interface-id", "BBB", &dhcp_universe, 94, 1 },
- { "pxe-client-id", "BX", &dhcp_universe, 97, 1 },
#endif
+ { "pxe-client-id", "BX", &dhcp_universe, 97, 1 },
+
{ "uap-servers", "t", &dhcp_universe, 98, 1 },
#if defined(RFC4776_OPTIONS)
{ "geoconf-civic", "X", &dhcp_universe, 99, 1 },
diff --git a/includes/dhcp.h b/includes/dhcp.h
index 7202f1d..4ad3874 100644
--- a/includes/dhcp.h
+++ b/includes/dhcp.h
@@ -158,6 +158,7 @@ struct dhcp_packet {
#define DHO_AUTHENTICATE 90 /* RFC3118, was 210 */
#define DHO_CLIENT_LAST_TRANSACTION_TIME 91
#define DHO_ASSOCIATED_IP 92
+#define DHO_PXE_CLIENT_ID 97 /* RFC4578 */
#define DHO_V6_ONLY_PREFERRED 108 /* RFC8925 */
#define DHO_SUBNET_SELECTION 118 /* RFC3011! */
#define DHO_DOMAIN_SEARCH 119 /* RFC3397 */
diff --git a/server/dhcp.c b/server/dhcp.c
index 8363840..29d9c69 100644
--- a/server/dhcp.c
+++ b/server/dhcp.c
@@ -228,6 +228,10 @@ dhcp (struct packet *packet) {
if (lease -> uid_len) {
oc = lookup_option (&dhcp_universe, packet -> options,
DHO_DHCP_CLIENT_IDENTIFIER);
+ if (!oc)
+ oc = lookup_option (&dhcp_universe,
+ packet -> options,
+ DHO_PXE_CLIENT_ID);
if (!oc)
goto nolease;
@@ -826,6 +830,9 @@ void dhcprelease (packet, ms_nulltp)
oc = lookup_option (&dhcp_universe, packet -> options,
DHO_DHCP_CLIENT_IDENTIFIER);
+ if (!oc)
+ oc = lookup_option (&dhcp_universe, packet -> options,
+ DHO_PXE_CLIENT_ID);
memset (&data, 0, sizeof data);
if (oc &&
evaluate_option_cache (&data, packet, (struct lease *)0,
@@ -1338,6 +1345,9 @@ void dhcpinform (packet, ms_nulltp)
*/
oc = lookup_option(&dhcp_universe, packet->options,
DHO_DHCP_CLIENT_IDENTIFIER);
+ if (!oc)
+ oc = lookup_option (&dhcp_universe, packet -> options,
+ DHO_PXE_CLIENT_ID);
memset(&d1, 0, sizeof(d1));
if (oc &&
evaluate_option_cache(&d1, packet, NULL, NULL,
@@ -2448,6 +2458,9 @@ void ack_lease (packet, lease, offer, when, msg, ms_nulltp, hp)
can be used. */
oc = lookup_option (&dhcp_universe, packet -> options,
DHO_DHCP_CLIENT_IDENTIFIER);
+ if (!oc)
+ oc = lookup_option (&dhcp_universe, packet -> options,
+ DHO_PXE_CLIENT_ID);
if (oc &&
evaluate_option_cache (&d1, packet, lease,
(struct client_state *)0,
@@ -3040,6 +3053,9 @@ void ack_lease (packet, lease, offer, when, msg, ms_nulltp, hp)
/* Record the uid, if given... */
oc = lookup_option (&dhcp_universe, packet -> options,
DHO_DHCP_CLIENT_IDENTIFIER);
+ if (!oc)
+ oc = lookup_option (&dhcp_universe, packet -> options,
+ DHO_PXE_CLIENT_ID);
if (oc &&
evaluate_option_cache(&d1, packet, lease, NULL,
packet->options, state->options,
@@ -4258,6 +4274,9 @@ int find_lease (struct lease **lp,
specified unique client identifier. */
oc = lookup_option (&dhcp_universe, packet -> options,
DHO_DHCP_CLIENT_IDENTIFIER);
+ if (!oc)
+ oc = lookup_option (&dhcp_universe, packet -> options,
+ DHO_PXE_CLIENT_ID);
memset (&client_identifier, 0, sizeof client_identifier);
if (oc &&
evaluate_option_cache (&client_identifier,
diff --git a/server/dhcpd.conf.5 b/server/dhcpd.conf.5
index b7e79ea..2354b1d 100644
--- a/server/dhcpd.conf.5
+++ b/server/dhcpd.conf.5
@@ -1664,10 +1664,12 @@ should be a name identifying the host. If a \fIhostname\fR option is
not specified for the host, \fIhostname\fR is used.
.PP
\fIHost\fR declarations are matched to actual DHCP or BOOTP clients
-by matching the \fRdhcp-client-identifier\fR option specified in the
+by matching the \fIdhcp-client-identifier\fR or \fIpxe-client-id\fR
+options specified in the
\fIhost\fR declaration to the one supplied by the client, or, if the
\fIhost\fR declaration or the client does not provide a
-\fRdhcp-client-identifier\fR option, by matching the \fIhardware\fR
+\fIdhcp-client-identifier\fR or \fIpxe-client-id\fR options,
+by matching the \fIhardware\fR
parameter in the \fIhost\fR declaration to the network hardware
address supplied by the client. BOOTP clients do not normally
provide a \fIdhcp-client-identifier\fR, so the hardware address must
@@ -1679,7 +1681,8 @@ to identify hosts.
.PP
Please be aware that
.B only
-the \fIdhcp-client-identifier\fR option and the hardware address can be
+the \fIdhcp-client-identifier\fR and \fIpxe-client-id\fR
+options and the hardware address can be
used to match a host declaration, or the \fIhost-identifier option\fR
parameter for DHCPv6 servers. For example, it is not possible to
match a host declaration to a \fIhost-name\fR option. This is
diff --git a/server/dhcpleasequery.c b/server/dhcpleasequery.c
index 0f1d4f7..dae4ae7 100644
--- a/server/dhcpleasequery.c
+++ b/server/dhcpleasequery.c
@@ -276,7 +276,7 @@ dhcpleasequery(struct packet *packet, int ms_nulltp) {
*/
memset(&uid, 0, sizeof(uid));
- if (get_option(&uid,
+ i = get_option(&uid,
&dhcp_universe,
packet,
NULL,
@@ -286,8 +286,20 @@ dhcpleasequery(struct packet *packet, int ms_nulltp) {
packet->options,
&global_scope,
DHO_DHCP_CLIENT_IDENTIFIER,
- MDL)) {
-
+ MDL);
+ if (!i)
+ i = get_option(&uid,
+ &dhcp_universe,
+ packet,
+ NULL,
+ NULL,
+ packet->options,
+ NULL,
+ packet->options,
+ &global_scope,
+ DHO_PXE_CLIENT_ID,
+ MDL);
+ if (i) {
snprintf(dbg_info,
sizeof(dbg_info),
"client-id %s",
diff --git a/server/failover.c b/server/failover.c
index 5b36d3a..a641e86 100644
--- a/server/failover.c
+++ b/server/failover.c
@@ -5988,6 +5988,9 @@ int load_balance_mine (struct packet *packet, dhcp_failover_state_t *state)
oc = lookup_option(&dhcp_universe, packet->options,
DHO_DHCP_CLIENT_IDENTIFIER);
+ if (!oc)
+ oc = lookup_option(&dhcp_universe, packet -> options,
+ DHO_PXE_CLIENT_ID);
memset(&ds, 0, sizeof ds);
if (oc &&
evaluate_option_cache(&ds, packet, NULL, NULL,
diff --git a/server/mdb.c b/server/mdb.c
index 60a40e1..2cd5605 100644
--- a/server/mdb.c
+++ b/server/mdb.c
@@ -129,8 +129,9 @@ static int find_uid_statement (struct executable_statement *esp,
esp -> data.option &&
(esp -> data.option -> option -> universe ==
&dhcp_universe) &&
- (esp -> data.option -> option -> code ==
- DHO_DHCP_CLIENT_IDENTIFIER)) {
+ ((esp -> data.option -> option -> code ==
+ DHO_DHCP_CLIENT_IDENTIFIER) ||
+ (esp -> data.option -> option -> code == DHO_PXE_CLIENT_ID))) {
if (condp) {
log_error ("dhcp client identifier may not be %s",
"specified conditionally.");
--
2.35.1
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