#8 Broadcast addresses do not work

[Nathan Catlow]

Network broadcast addresses do not work,

for UDP you need to set SO_BROADCAST option on sockets.
This is also a bug in original netcat.

for TCP I don't know if this is possible, but wouldn't
it be way cool.

[Giovanni Giacobbi]

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This is something I heard before, but i'm not that sure
about it. I will investigate on this.

Thanks.

[Nathan Catlow]

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After a bit more investigation I do not think TCP broadcasts
are going to be possible through standard socket calls, it
*may* be related to
http://www.securityfocus.com/archive/1/262733. I'm fairly
sure it used to be possible (but i have been known to be
wrong on more than one occasion :).

for UDP however, I added the SO_BROADCAST option in
network.c line 372 and this works but exhibited the same UDP
type bug as seen before (although that bug is now fixed,
thankyou). Two seperate machines this time:

$ ./netcat -vv -l -u -p 2000 10.254.254.255
hello

$ ./netcat -vv -u 10.254.254.255 2000
hello
there
no more data getting through

I hope this helps?

[Nobody/Anonymous]

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Ok, it traps well the first brodcast msg, but hen it doesn't
trap the next ones !

hope it helps...

[Holger Jakobs]

So after more than 10 years the bug is still there.

Luckily, with socat testing of UDP broadcasts works fine.