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dhcp/0015-Add-GUID-DUID-to-dhcpd-logs-1064416.patch

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From 3d3e442ed1316930a5360e4d5a56b46a42a29419 Mon Sep 17 00:00:00 2001
From: Pavel Zhukov <pzhukov@redhat.com>
Date: Thu, 21 Feb 2019 10:35:47 +0100
Subject: [PATCH 15/26] Add GUID/DUID to dhcpd logs (#1064416)
Cc: pzhukov@redhat.com
---
client/dhclient.c | 75 ++++++++++++++++++++++++++++++++++++++++++----------
server/dhcp.c | 78 +++++++++++++++++++++++++++++++++----------------------
2 files changed, 108 insertions(+), 45 deletions(-)
diff --git a/client/dhclient.c b/client/dhclient.c
index dc9080e..8e57da9 100644
--- a/client/dhclient.c
+++ b/client/dhclient.c
@@ -1170,6 +1170,26 @@ main(int argc, char **argv) {
}
}
+ /* We create a backup seed before rediscovering interfaces in order to
+ have a seed built using all of the available interfaces
+ It's interesting if required interfaces doesn't let us defined
+ a really unique seed due to a lack of valid HW addr later
+ (this is the case with DHCP over IB)
+ We only use the last device as using a sum could broke the
+ uniqueness of the seed among multiple nodes
+ */
+ unsigned backup_seed = 0;
+ for (ip = interfaces; ip; ip = ip -> next) {
+ int junk;
+ if ( ip -> hw_address.hlen <= sizeof seed )
+ continue;
+ memcpy (&junk,
+ &ip -> hw_address.hbuf [ip -> hw_address.hlen -
+ sizeof seed], sizeof seed);
+ backup_seed = junk;
+ }
+
+
/* At this point, all the interfaces that the script thinks
are relevant should be running, so now we once again call
discover_interfaces(), and this time ask it to actually set
@@ -1184,14 +1204,36 @@ main(int argc, char **argv) {
Not much entropy, but we're booting, so we're not likely to
find anything better. */
seed = 0;
+ int seed_flag = 0;
for (ip = interfaces; ip; ip = ip->next) {
int junk;
+ if ( ip -> hw_address.hlen <= sizeof seed )
+ continue;
memcpy(&junk,
&ip->hw_address.hbuf[ip->hw_address.hlen -
sizeof seed], sizeof seed);
seed += junk;
+ seed_flag = 1;
}
- srandom(seed + cur_time + (unsigned)getpid());
+ if ( seed_flag == 0 ) {
+ if ( backup_seed != 0 ) {
+ seed = backup_seed;
+ log_info ("xid: rand init seed (0x%x) built using all"
+ " available interfaces",seed);
+ }
+ else {
+ seed = cur_time^((unsigned) gethostid()) ;
+ log_info ("xid: warning: no netdev with useable HWADDR found"
+ " for seed's uniqueness enforcement");
+ log_info ("xid: rand init seed (0x%x) built using gethostid",
+ seed);
+ }
+ /* we only use seed and no current time as a broadcast reply */
+ /* will certainly be used by the hwaddrless interface */
+ srandom(seed + ((unsigned)(cur_tv.tv_usec * 1000000)) + (unsigned)getpid());
+ }
+ else
+ srandom(seed + ((unsigned)(cur_tv.tv_usec * 1000000)) + (unsigned)getpid());
/* Setup specific Infiniband options */
for (ip = interfaces; ip; ip = ip->next) {
@@ -1746,10 +1788,10 @@ void dhcpack (packet)
#endif
return;
}
-
- log_info ("DHCPACK of %s from %s",
- inet_ntoa(packet->raw->yiaddr),
- piaddr (packet->client_addr));
+ log_info ("DHCPACK of %s from %s (xid=0x%x)",
+ inet_ntoa(packet->raw->yiaddr),
+ piaddr (packet -> client_addr),
+ ntohl(client -> xid));
lease = packet_to_lease (packet, client);
if (!lease) {
@@ -2669,7 +2711,7 @@ void dhcpnak (packet)
return;
}
- log_info ("DHCPNAK from %s", piaddr (packet -> client_addr));
+ log_info ("DHCPNAK from %s (xid=0x%x)", piaddr (packet -> client_addr), ntohl(client -> xid));
if (!client -> active) {
#if defined (DEBUG)
@@ -2802,10 +2844,10 @@ void send_discover (cpp)
(long)(client -> interval));
} else
#endif
- log_info ("DHCPDISCOVER on %s to %s port %d interval %ld",
+ log_info ("DHCPDISCOVER on %s to %s port %d interval %ld (xid=0x%x)",
client -> name ? client -> name : client -> interface -> name,
inet_ntoa (sockaddr_broadcast.sin_addr),
- ntohs (sockaddr_broadcast.sin_port), (long)(client -> interval));
+ ntohs (sockaddr_broadcast.sin_port), (long)(client -> interval), ntohl(client -> xid));
/* Send out a packet. */
#if defined(DHCPv6) && defined(DHCP4o6)
@@ -3108,10 +3150,12 @@ void send_request (cpp)
}
strncpy(rip_buf, rip_str, sizeof(rip_buf)-1);
- log_info ("DHCPREQUEST for %s on %s to %s port %d", rip_buf,
+ log_info ("DHCPREQUEST for %s on %s to %s port %d (xid=0x%x)",
+ rip_buf,
client->name ? client->name : client->interface->name,
inet_ntoa(destination.sin_addr),
- ntohs (destination.sin_port));
+ ntohs (destination.sin_port),
+ ntohl(client -> xid));
#if defined(DHCPv6) && defined(DHCP4o6)
if (dhcpv4_over_dhcpv6) {
@@ -3168,11 +3212,13 @@ void send_decline (cpp)
log_info ("DHCPDECLINE");
} else
#endif
- log_info ("DHCPDECLINE of %s on %s to %s port %d",
+ log_info ("DHCPDECLINE of %s on %s to %s port %d (xid=0x%x)",
piaddr(client->requested_address),
(client->name ? client->name : client->interface->name),
inet_ntoa(sockaddr_broadcast.sin_addr),
- ntohs(sockaddr_broadcast.sin_port));
+ ntohs(sockaddr_broadcast.sin_port),
+ ntohl(client -> xid));
+
/* Send out a packet. */
#if defined(DHCPv6) && defined(DHCP4o6)
@@ -3231,11 +3277,12 @@ void send_release (cpp)
log_info ("DHCPRELEASE");
} else
#endif
- log_info ("DHCPRELEASE of %s on %s to %s port %d",
+ log_info ("DHCPRELEASE of %s on %s to %s port %d (xid=0x%x)",
piaddr(client->active->address),
client->name ? client->name : client->interface->name,
inet_ntoa (destination.sin_addr),
- ntohs (destination.sin_port));
+ ntohs (destination.sin_port),
+ ntohl(client -> xid));
#if defined(DHCPv6) && defined(DHCP4o6)
if (dhcpv4_over_dhcpv6) {
diff --git a/server/dhcp.c b/server/dhcp.c
index 20f2a62..0582c4c 100644
--- a/server/dhcp.c
+++ b/server/dhcp.c
@@ -87,6 +87,42 @@ const int dhcp_type_name_max = ((sizeof dhcp_type_names) / sizeof (char *));
static TIME leaseTimeCheck(TIME calculated, TIME alternate);
+char *print_client_identifier_from_packet (packet)
+ struct packet *packet;
+{
+ struct option_cache *oc;
+ struct data_string client_identifier;
+ char *ci;
+
+ memset (&client_identifier, 0, sizeof client_identifier);
+
+ oc = lookup_option (&dhcp_universe, packet -> options,
+ DHO_DHCP_CLIENT_IDENTIFIER);
+ if (oc &&
+ evaluate_option_cache (&client_identifier,
+ packet, (struct lease *)0,
+ (struct client_state *)0,
+ packet -> options,
+ (struct option_state *)0,
+ &global_scope, oc, MDL)) {
+ ci = print_hw_addr (HTYPE_INFINIBAND, client_identifier.len, client_identifier.data);
+ data_string_forget (&client_identifier, MDL);
+ return ci;
+ } else
+ return "\"no client id\"";
+}
+
+char *print_hw_addr_or_client_id (packet)
+ struct packet *packet;
+{
+ if (packet -> raw -> htype == HTYPE_INFINIBAND)
+ return print_client_identifier_from_packet (packet);
+ else
+ return print_hw_addr (packet -> raw -> htype,
+ packet -> raw -> hlen,
+ packet -> raw -> chaddr);
+}
+
void
dhcp (struct packet *packet) {
int ms_nulltp = 0;
@@ -129,9 +165,7 @@ dhcp (struct packet *packet) {
log_info("%s from %s via %s: %s", s,
(packet->raw->htype
- ? print_hw_addr(packet->raw->htype,
- packet->raw->hlen,
- packet->raw->chaddr)
+ ? print_hw_addr_or_client_id(packet)
: "<no identifier>"),
packet->raw->giaddr.s_addr
? inet_ntoa(packet->raw->giaddr)
@@ -328,9 +362,7 @@ void dhcpdiscover (packet, ms_nulltp)
#endif
snprintf (msgbuf, sizeof msgbuf, "DHCPDISCOVER from %s %s%s%svia %s",
(packet -> raw -> htype
- ? print_hw_addr (packet -> raw -> htype,
- packet -> raw -> hlen,
- packet -> raw -> chaddr)
+ ? print_hw_addr_or_client_id (packet)
: (lease
? print_hex_1(lease->uid_len, lease->uid, 60)
: "<no identifier>")),
@@ -542,9 +574,7 @@ void dhcprequest (packet, ms_nulltp, ip_lease)
"DHCPREQUEST for %s%s from %s %s%s%svia %s",
piaddr (cip), smbuf,
(packet -> raw -> htype
- ? print_hw_addr (packet -> raw -> htype,
- packet -> raw -> hlen,
- packet -> raw -> chaddr)
+ ? print_hw_addr_or_client_id(packet)
: (lease
? print_hex_1(lease->uid_len, lease->uid, 60)
: "<no identifier>")),
@@ -785,9 +815,7 @@ void dhcprelease (packet, ms_nulltp)
if ((oc = lookup_option (&dhcp_universe, packet -> options,
DHO_DHCP_REQUESTED_ADDRESS))) {
log_info ("DHCPRELEASE from %s specified requested-address.",
- print_hw_addr (packet -> raw -> htype,
- packet -> raw -> hlen,
- packet -> raw -> chaddr));
+ print_hw_addr_or_client_id(packet));
}
oc = lookup_option (&dhcp_universe, packet -> options,
@@ -879,9 +907,7 @@ void dhcprelease (packet, ms_nulltp)
"DHCPRELEASE of %s from %s %s%s%svia %s (%sfound)",
cstr,
(packet -> raw -> htype
- ? print_hw_addr (packet -> raw -> htype,
- packet -> raw -> hlen,
- packet -> raw -> chaddr)
+ ? print_hw_addr_or_client_id(packet)
: (lease
? print_hex_1(lease->uid_len, lease->uid, 60)
: "<no identifier>")),
@@ -986,9 +1012,7 @@ void dhcpdecline (packet, ms_nulltp)
"DHCPDECLINE of %s from %s %s%s%svia %s",
piaddr (cip),
(packet -> raw -> htype
- ? print_hw_addr (packet -> raw -> htype,
- packet -> raw -> hlen,
- packet -> raw -> chaddr)
+ ? print_hw_addr_or_client_id(packet)
: (lease
? print_hex_1(lease->uid_len, lease->uid, 60)
: "<no identifier>")),
@@ -1732,8 +1756,7 @@ void dhcpinform (packet, ms_nulltp)
/* Report what we're sending. */
snprintf(msgbuf, sizeof msgbuf, "DHCPACK to %s (%s) via", piaddr(cip),
(packet->raw->htype && packet->raw->hlen) ?
- print_hw_addr(packet->raw->htype, packet->raw->hlen,
- packet->raw->chaddr) :
+ print_hw_addr_or_client_id(packet) :
"<no client hardware address>");
log_info("%s %s", msgbuf, gip.len ? piaddr(gip) :
packet->interface->name);
@@ -1918,9 +1941,7 @@ void nak_lease (packet, cip, network_group)
#endif
log_info ("DHCPNAK on %s to %s via %s",
piaddr (*cip),
- print_hw_addr (packet -> raw -> htype,
- packet -> raw -> hlen,
- packet -> raw -> chaddr),
+ print_hw_addr_or_client_id(packet),
packet -> raw -> giaddr.s_addr
? inet_ntoa (packet -> raw -> giaddr)
: packet -> interface -> name);
@@ -3936,7 +3957,7 @@ void dhcp_reply (lease)
? (state -> offer == DHCPACK ? "DHCPACK" : "DHCPOFFER")
: "BOOTREPLY"),
piaddr (lease -> ip_addr),
- (lease -> hardware_addr.hlen
+ (lease -> hardware_addr.hlen > 1
? print_hw_addr (lease -> hardware_addr.hbuf [0],
lease -> hardware_addr.hlen - 1,
&lease -> hardware_addr.hbuf [1])
@@ -4497,10 +4518,7 @@ int find_lease (struct lease **lp,
if (uid_lease) {
if (uid_lease->binding_state == FTS_ACTIVE) {
log_error ("client %s has duplicate%s on %s",
- (print_hw_addr
- (packet -> raw -> htype,
- packet -> raw -> hlen,
- packet -> raw -> chaddr)),
+ (print_hw_addr_or_client_id(packet)),
" leases",
(ip_lease -> subnet ->
shared_network -> name));
@@ -4667,9 +4685,7 @@ int find_lease (struct lease **lp,
log_error("uid lease %s for client %s is duplicate "
"on %s",
piaddr(uid_lease->ip_addr),
- print_hw_addr(packet->raw->htype,
- packet->raw->hlen,
- packet->raw->chaddr),
+ print_hw_addr_or_client_id(packet),
uid_lease->subnet->shared_network->name);
if (!packet -> raw -> ciaddr.s_addr &&
--
2.14.5
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