hping: physical layer header size unknown

Ephracis · 03-30-2005, 05:50 AM

I can't use hping for some reason.

Code:

$ hping 127.0.0.1
HPING 127.0.0.1 (lo 127.0.0.1): S set, 40 headers + 0 data bytes
(I have blocked ping)

--- 127.0.0.1 hping statistic ---
2 packets tramitted, 0 packets received, 100% packet loss
round-trip min/avg/max = 0.0/0.0/0.0 ms
$ hping 192.168.0.48
[main] physical layer header size unknown
$ hping linuxquestions.org
[main] physical layer header size unknown
$ hping -i ath0 192.168.0.48
[main] physical layer header size unknown
$ ifconfig
ath0      Link encap:Ethernet  HWaddr 00:11:95:CA:78:64  
          inet addr:192.168.0.252  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1659 errors:90 dropped:0 overruns:0 frame:90
          TX packets:1641 errors:3 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:199 
          RX bytes:708812 (692.1 Kb)  TX bytes:243849 (238.1 Kb)
          Interrupt:18 Memory:ccfc0000-ccfd0000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:54 errors:0 dropped:0 overruns:0 frame:0
          TX packets:54 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:3336 (3.2 Kb)  TX bytes:3336 (3.2 Kb)
$ ping 192.168.0.48
PING 192.168.0.48 (192.168.0.48) 56(84) bytes of data.
64 bytes from 192.168.0.48: icmp_seq=1 ttl=64 time=4.88 ms
64 bytes from 192.168.0.48: icmp_seq=2 ttl=64 time=0.876 ms

--- 192.168.0.48 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.876/2.881/4.886/2.005 ms

Is there anything special when using hping on a wireless interface?

zitstif · 10-20-2006, 12:13 AM

I have the exact same problem:

SUSE 10 alpha

hping 127.0.0.1
HPING 127.0.0.1 (lo 127.0.0.1): NO FLAGS are set, 40 headers + 0 data bytes
len=40 ip=127.0.0.1 ttl=64 DF id=0 sport=0 flags=RA seq=0 win=0 rtt=0.3 ms
len=40 ip=127.0.0.1 ttl=64 DF id=0 sport=0 flags=RA seq=1 win=0 rtt=0.2 ms
len=40 ip=127.0.0.1 ttl=64 DF id=0 sport=0 flags=RA seq=2 win=0 rtt=0.2 ms
1: len=40 ip=127.0.0.1 ttl=64 DF id=0 sport=1 flags=RA seq=3 win=0 rtt=0.2 ms
len=40 ip=127.0.0.1 ttl=64 DF id=0 sport=1 flags=RA seq=4 win=0 rtt=0.2 ms

but trying a remote host results in:

hping www.google.com
[main] physical layer header size unknown

and even with remote ip addresses

hping2 72.14.203.104
[main] physical layer header size unknown

anyone find a solution?

seems like it's making a call to this function..

if ( get_linkhdrsize(ifname) == -1 )
{
printf("[main] physical layer header size unknown\n");
exit(1);
}

bugmenot · 01-20-2008, 07:50 PM

I had no luck trying to hping my bridge interface. Works fine with the eth0 interface which is part of it, though.

# hping2 -I br0 -S 123.456.789.123 -c 3 -p 22
[main] physical layer header size unknown

# hping2 -I eth0 -S 123.456.789.123 -c 3 -p 22
HPING 123.456.789.123 (lo 123.456.789.123): S set, 40 headers + 0 data bytes
len=44 ip=123.456.789.123 ttl=64 DF id=0 sport=22 flags=SA seq=0 win=32792 rtt=0.2 ms
len=44 ip=123.456.789.123 ttl=64 DF id=0 sport=22 flags=SA seq=1 win=32792 rtt=0.1 ms
len=44 ip=123.456.789.123 ttl=64 DF id=0 sport=22 flags=SA seq=2 win=32792 rtt=0.1 ms

I investigated further and found this:

/* header size of some physical layer type */
#define PPPHDR_SIZE 0
#define ETHHDR_SIZE sizeof(struct ethhdr)
#define LOHDR_SIZE sizeof(struct ethhdr)
#define UNKNOWNHDR_SIZE 0

int get_linkhdrsize(char *ifname)
{
if ( strstr(ifname, "ppp") )
{
linkhdr_size = PPPHDR_SIZE;
return 0;
}
else if ( strstr(ifname, "eth") )
{
linkhdr_size = ETHHDR_SIZE;
return 0;
}
else if ( strstr(ifname, "lo") )
{
linkhdr_size = LOHDR_SIZE;
return 0;
}
else
return 1;
}

via_strass · 07-16-2008, 05:10 AM

I had the same problem using hping2 over a wireless interface but hping3 worked fine.

flembot · 03-27-2009, 06:57 PM

Like this:
...
} else if ( strstr(ifname, "eth") ) {
linkhdr_size = ETHHDR_SIZE;
return 0;
} else if ( strstr(ifname, "br") ) { // << ADD THIS FOR YOUR BRIDGE DEVICES like br0
linkhdr_size = ETHHDR_SIZE;
return 0;
} else if (strstr(ifname, "ets")) {
...

Recompile, and you should be golden.