[Nagiosplug-devel] [ nagiosplug-Bugs-3503921 ] check_dhcp.c incorrectly setting source ip address as siaddr

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Bugs item #3503921, was opened at 2012-03-13 16:16
Message generated for change (Comment added) made by infotek411
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=397597&aid=3503921&group_id=29880

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: General plugin execution
Group: release-1.4.15
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: infotek at gmail.com ()
Assigned to: Nobody/Anonymous (nobody)
Summary: check_dhcp.c incorrectly setting source ip address as siaddr

Initial Comment:
nagios-plugins-1.4.15
plugins-root/check_dhcp.c

Sets dhcp server source ip to the next server (siaddr) IP address,
causing -s to fail to operate as expected.

 -s, --serverip=IPADDRESS
   IP address of DHCP server that we must hear from


root at nagios:/usr/local/src/nagios-plugins-1.4.15# ./plugins-root/check_dhcp -v
DHCP socket: 3
Hardware address: 00:22:19:56:99:48
DHCPDISCOVER to 255.255.255.255 port 67
DHCPDISCOVER XID: 275057756 (0x10650C5C)
DHCDISCOVER ciaddr:  0.0.0.0
DHCDISCOVER yiaddr:  0.0.0.0
DHCDISCOVER siaddr:  0.0.0.0
DHCDISCOVER giaddr:  0.0.0.0
send_dhcp_packet result: 548




recv_result_1: 300
recv_result_2: 300
receive_dhcp_packet() result: 300
receive_dhcp_packet() source: 10.10.10.15
Result=OK
DHCPOFFER from IP address 10.10.10.15 via 10.10.10.15
DHCPOFFER XID: 275057756 (0x10650C5C)
DHCPOFFER chaddr: 002219569948
DHCPOFFER ciaddr: 0.0.0.0
DHCPOFFER yiaddr: 10.10.10.166
DHCPOFFER siaddr: 10.10.10.24
DHCPOFFER giaddr: 0.0.0.0
Option: 53 (0x01)
Option: 1 (0x04)
Option: 58 (0x04)
Option: 59 (0x04)
Lease Time: 0 seconds
Renewal Time: 14400 seconds
Rebinding Time: 25200 seconds
Added offer from server @ 10.10.10.15 of IP address 10.10.10.166


No (more) data received (nfound: 0)
Result=ERROR
Total responses seen on the wire: 1
Valid responses for this machine: 1
OK: Received 1 DHCPOFFER(s), max lease time = 0 sec.


17:58:55.805403 IP (tos 0x0, ttl 128, id 20477, offset 0, flags
[none], proto UDP (17), length 328)
   10.10.10.15.67 > 255.255.255.255.68: [udp sum ok] BOOTP/DHCP,
Reply, length 300, xid 0x10650c5c, Flags [none] (0x0000)
         Your-IP 10.10.10.166
         Server-IP 10.10.10.24
         Client-Ethernet-Address 00:22:19:56:99:48
         file "kbox2000.0"
         Vendor-rfc1048 Extensions
           Magic Cookie 0x63825363
           DHCP-Message Option 53, length 1: Offer
           Subnet-Mask Option 1, length 4: 255.255.255.0
           RN Option 58, length 4: 14400
           RB Option 59, length 4: 25200
           Lease-Time Option 51, length 4: 28800
           Server-ID Option 54, length 4: 10.10.10.15
       0x0000:  4500 0148 4ffd 0000 8011 d58f 0a0a 0a0f
       0x0010:  ffff ffff 0043 0044 0134 2e43 0201 0600
       0x0020:  1065 0c5c 0000 0000 0000 0000 0a0a 0aa6
       0x0030:  0a0a 0a18 0000 0000 0022 1956 9948 0000
       0x0040:  0000 0000 0000 0000 0000 0000 0000 0000
       0x0050:  0000 0000 0000 0000 0000 0000 0000 0000
       0x0060:  0000 0000 0000 0000 0000 0000 0000 0000
       0x0070:  0000 0000 0000 0000 0000 0000 0000 0000
       0x0080:  0000 0000 0000 0000 6b62 6f78 3230 3030
       0x0090:  2e30 0000 0000 0000 0000 0000 0000 0000
       0x00a0:  0000 0000 0000 0000 0000 0000 0000 0000
       0x00b0:  0000 0000 0000 0000 0000 0000 0000 0000
       0x00c0:  0000 0000 0000 0000 0000 0000 0000 0000
       0x00d0:  0000 0000 0000 0000 0000 0000 0000 0000
       0x00e0:  0000 0000 0000 0000 0000 0000 0000 0000
       0x00f0:  0000 0000 0000 0000 0000 0000 0000 0000
       0x0100:  0000 0000 0000 0000 6382 5363 3501 0201
       0x0110:  04ff ffff 003a 0400 0038 403b 0400 0062
       0x0120:  7033 0400 0070 8036 040a 0a0a 0fff 0000
       0x0130:  0000 0000 0000 0000 0000 0000 0000 0000
       0x0140:  0000 0000 0000 0000



plugins-root/check_dhcp.c

FIX
               /* If siaddr is non-zero, set "source" to siaddr */
/* don't set the source to next boot server (siaddr) 591 infotek at gmail.com
               if(offer_packet.siaddr.s_addr != 0L){
                       source.sin_addr.s_addr = offer_packet.siaddr.s_addr ;
                       }
*/

----------------------------------------------------------------------

Comment By: Jason Ellison (infotek411)
Date: 2012-03-13 17:27

Message:
diff --git a/a/plugins-root/check_dhcp.c b/b/plugins-root/check_dhcp.c
index 2a1875c..b7f695b 100644
--- a/a/plugins-root/check_dhcp.c
+++ b/b/plugins-root/check_dhcp.c
@@ -588,10 +588,11 @@ int get_dhcp_offer(int sock){
                memcpy(&via,&source,sizeof(source)) ;

                /* If siaddr is non-zero, set "source" to siaddr */
+/* don't set the source to next boot server (siaddr) 591 infotek at gmail.com
                if(offer_packet.siaddr.s_addr != 0L){
                        source.sin_addr.s_addr = offer_packet.siaddr.s_addr
;
                        }
-
+*/
                if(verbose){
                        printf(_("DHCPOFFER from IP address
%s"),inet_ntoa(source.sin_addr));
                        printf(_(" via %s\n"),inet_ntoa(via.sin_addr));


----------------------------------------------------------------------

Comment By: Jason Ellison (infotek411)
Date: 2012-03-13 17:03

Message:
I verified that I can check remote DHCP servers correctly after applying
the fix.  Options used were "check_dhcp -u -s 10.10.10.15".

----------------------------------------------------------------------

Comment By: infotek at gmail.com ()
Date: 2012-03-13 16:47

Message:
Example of -s being specified correctly in verbose mode.  Fails because
siaddr (10.10.10.24) is copied over source (10.10.10.15).

root at nagios:/usr/local/src/nagios-plugins-1.4.15# ./plugins-root/check_dhcp
 -v -s 10.10.10.15


Requested server address: 10.10.10.15
DHCP socket: 3
Hardware address: 00:22:19:56:99:48
DHCPDISCOVER to 255.255.255.255 port 67
DHCPDISCOVER XID: 513242689 (0x1E977641)
DHCDISCOVER ciaddr:  0.0.0.0
DHCDISCOVER yiaddr:  0.0.0.0
DHCDISCOVER siaddr:  0.0.0.0
DHCDISCOVER giaddr:  0.0.0.0
send_dhcp_packet result: 548




recv_result_1: 300
recv_result_2: 300
receive_dhcp_packet() result: 300
receive_dhcp_packet() source: 10.10.10.15
Result=OK
DHCPOFFER from IP address 10.10.10.24 via 10.10.10.15
DHCPOFFER XID: 513242689 (0x1E977641)
DHCPOFFER chaddr: 002219569948
DHCPOFFER ciaddr: 0.0.0.0
DHCPOFFER yiaddr: 10.10.10.166
DHCPOFFER siaddr: 10.10.10.24
DHCPOFFER giaddr: 0.0.0.0
Option: 53 (0x01)
Option: 1 (0x04)
Option: 58 (0x04)
Option: 59 (0x04)
Lease Time: 0 seconds
Renewal Time: 14400 seconds
Rebinding Time: 25200 seconds
Added offer from server @ 10.10.10.24 of IP address 10.10.10.166


No (more) data received (nfound: 0)
Result=ERROR
Total responses seen on the wire: 1
Valid responses for this machine: 1
CRITICAL: Received 1 DHCPOFFER(s), 0 of 1 requested servers responded, max
lease time = 0 sec.


----------------------------------------------------------------------

Comment By: infotek at gmail.com ()
Date: 2012-03-13 16:33

Message:
The ticket contains the output of check_dhcp after I fixed it (oops).
Sorry :(
  Jason Ellison

Below is the output from an unmodified  version of check_dhcp :

root at nagios:/usr/local/src/nagios-plugins-1.4.15# ./plugins-root/check_dhcp
-v
DHCP socket: 3
Hardware address: 00:22:19:56:99:48
DHCPDISCOVER to 255.255.255.255 port 67
DHCPDISCOVER XID: 1292513780 (0x4D0A31F4)
DHCDISCOVER ciaddr:  0.0.0.0
DHCDISCOVER yiaddr:  0.0.0.0
DHCDISCOVER siaddr:  0.0.0.0
DHCDISCOVER giaddr:  0.0.0.0
send_dhcp_packet result: 548




recv_result_1: 300
recv_result_2: 300
receive_dhcp_packet() result: 300
receive_dhcp_packet() source: 10.10.10.15
Result=OK
DHCPOFFER from IP address 10.10.10.24 via 10.10.10.15
DHCPOFFER XID: 1292513780 (0x4D0A31F4)
DHCPOFFER chaddr: 002219569948
DHCPOFFER ciaddr: 0.0.0.0
DHCPOFFER yiaddr: 10.10.10.166
DHCPOFFER siaddr: 10.10.10.24
DHCPOFFER giaddr: 0.0.0.0
Option: 53 (0x01)
Option: 1 (0x04)
Option: 58 (0x04)
Option: 59 (0x04)
Lease Time: 0 seconds
Renewal Time: 14400 seconds
Rebinding Time: 25200 seconds
Added offer from server @ 10.10.10.24 of IP address 10.10.10.166


No (more) data received (nfound: 0)
Result=ERROR
Total responses seen on the wire: 1
Valid responses for this machine: 1
OK: Received 1 DHCPOFFER(s), max lease time = 0 sec.


----------------------------------------------------------------------

Comment By: infotek at gmail.com ()
Date: 2012-03-13 16:22

Message:
was trying to use google login...
Jason Ellison infotek at gmail.com

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=397597&aid=3503921&group_id=29880
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