cdpr - Cisco Discovery Protocol Reporter

Copyright (c) 2002-2010 MonkeyMental.com

Copyright (c) 2015 Tim Dorssers

The default behaviour is to send a CDP/LLDP trigger packet on startup (unless -s is specified) and send a regular CDP/LLDP packet every minute. After one CDP/LLDP packet has been received, the program will quit unless -c is specified. All available Ethernet interfaces on a host are used for sending and receiving, unless -i or -d is specified. Use -l to see what adapters are available to specify using -d. After 300 seconds the program will quit, unless specified otherwise using -t. Regular TLVs are reported by default and all known TLVs are reported by specifying -v. Unknown TLVs are also reported by specifying -vv.

libpcap 0.9.1 or later required for pcap_sendpacket support.

cdpr has been compiled and tested on the following Operating Systems:

• Windows 8.1 and 10 using Visual Studio 2015 on [x86]
• Linux 3.10.0 and 3.19.0 using gcc 4.8 on [x86_64]
• Mac OS X 10.11 using gcc 4.2 on [x86_64]
• Oracle Solaris 11.3 using gcc 4.8 on [x86_64]
• FreeBSD 10.2 using gcc 4.8 on [x86_64]
• Linux 2.6.18 using gcc 4.1 on [sparc]
• Linux 3.2.0 using gcc 3.6 on [armv7l] [mips64] [ppc]
• NetBSD 7.0 using gcc 4.8 on [sparc64]

Command line options

-a: LLDP 802.1AB only mode
-o: CDP only mode
-c: Continuous capture mode; does not stop upon first reception
-s: Silent mode; do not send trigger packet
-i: Interactive mode; lets user pick a device to listen on
-l: Lists devices
-d: Specify device to use (eth0, hme0, etc.)
-h: Print usage
-t: Time in seconds to abort waiting for packets (default is 300)
-v[vv]: Set verbose mode

Compile instructions for Windows

To build it from source download the WinPcap Developers Pack unzip it into the cdpr source tree. Your directory structure should looks something like this:

\cdpr-3.0
 +-WpdPack
  +-docs
  +-Examples
  +-Include
  +-Lib

Version History

3.0.0

• Forked MonkeyMental.com's version 2.4 code
• Removed the functionality to report CDP data back to a centralized server
• Added all known TLVs and CDP capabilities, supporting Nexus switches
• Added more TLV decoding functionality to the print_cdp_packet routine
• Added the CDP send module to send a VLAN request to a Catalyst switch to trigger a CDP advertisement
• Added multiple interface support; send and receive on all Ethernet interfaces on a host
• Added friendly interface name support under Win32
• Changed behaviour to quit the application after reception of a CDP packet

3.0.1

• Added IPv6 support to the CDP send module
• Added support for CPU architectures that require memory alignment to the CDP send module

3.0.2

• Added IPv6 support to the CDP send module

3.0.3

• Added LLDP reporting support
• Added LLDP to send module to trigger advertisements

3.0.4

• Added Npcap compatibility