"etherpuppet -s 9999 -C -i eth0" returns help text

[xanth]

etherpuppet command line that works on other platforms returns help text when used under raspbian.

actual behavior:
# etherpuppet -s 9999 -C -i eth0
Usage: etherpuppet {-s port|-c targetip:port} [-B|-S|-M <arg>] [-C] -i iface
       etherpuppet -m {-s port|-c targetip:port} [-I ifname]
-s <port> : listen on TCP port <port>
-c <IP>:<port> : connect to <IP>:<port>
-i <iface> : vampirize interface <iface>
-I <ifname> : choose the name of the virtual interface
-m : master mode
-B : do not use any BPF. Etherpuppet may see its own traffic!
-S : build BPF filter with SSH_CONNECTION environment variable
-M src:sp,dst:dp : BPF filter manual configuration
-C : don't copy real interface parameters to virtual interface
-d : increase debug level (can be used more than once)

The same command line works on an Ubuntu 16.04 with the same release version but different arch and on a Tomato Shibby 138 router.

Expected behavior:
# etherpuppet -s 9999 -C -i eth0
  Waiting for connection on port 9999...

Additional information:
# uname -a
Linux pi 4.4.21+ #911 Thu Sep 15 14:17:52 BST 2016 armv6l GNU/Linux
# ldd /usr/bin/etherpuppet
 /usr/lib/arm-linux-gnueabihf/libarmmem.so (0xb6f3b000)
 libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6de5000)
 /lib/arm-linux-gnueabihf/ld-linux.so.3 => /lib/ld-linux-armhf.so.3 (0x7f5fa000)
# dpkg -s libc6 | grep ^Version
Version: 2.19-18+deb8u6
# dpkg -s raspi-copies-and-fills | grep ^Version
Version: 0.5-1

Hardware:
# cat /proc/cpuinfo | grep Revision
Revision : 000e

strace:
http://pastebin.com/FgCQCawT

[Psi-Jack (erenfro)]

I can confirm that this bug definitely is occurring specifically on Raspbian. Debian and Ubuntu do not exhibit this issue, and the OP's initial bug is completely valid.

[xanth (ubuntu-hi)]

I downloaded the rasbian stretch source and ran gcc -o etherpuppet etherpuppet.c
The results were the same.
The originating site seems to be damaged so I downloaded the archive.org source file from 6/29/13 (https://web-beta.archive.org/web/20130629074057/http://hg.secdev.org/etherpuppet/raw-file/tip/etherpuppet.c) and ran gcc -o etherpuppet etherpuppet.c
The results were as they should be, Waiting for connection on port 9999...

The diff between the broken raspbian source file and the working upstream from 6/29/13 was:

diff etherpuppet-0.3/etherpuppet.c secdev.org/etherpuppet.c
230c230,231
< char c, *p, *ip, *manual_bpf_arg;
---
> int c;
> char *p, *ip, *manual_bpf_arg;

[peter green (plugwash)]

This bug will affect any Debian/Ubuntu/etc system which uses unsigned chars. i386 and amd64 systems are not affected.

I will be uploading a fix to raspbian soon.