[PATCH] ping: try SOCK_DGRAM if no root privileges

[John Spencer]

Denys Vlasenko wrote:
> Applied, thanks.

i just tested this new functionality, and it hangs at recv and does 
nothing until the alarm is triggered:

  c = recv(pingsock, G.packet, sizeof(G.packet), 0);

(note: in order to test one has to echo groupid groupid > 
/proc/sys/net/ipv4/ping_group_range as described in the kernel commit:

https://lkml.org/lkml/2011/5/13/382 )

OTOH using the iputils source tarball provided on the kernel patch 
authors ping info page
( http://openwall.info/wiki/people/segoon/ping ) + the patch there, the 
resulting ping binary successfully is able to ping as an ordinary user 
without special privileges, as long as the groupid matches the range)
i fixed a couple compile errors in that version of iputils and squashed 
the needed ping code from that tarball into a single standalone 2KLOC C 
file - see attachment.

> 
> On Tue, Nov 26, 2013 at 10:18 PM, Daniel Borca <dborca at yahoo.com> wrote:
>> Allow non-setuid ping.
>>
>> Reference:
>> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c319b4d76b9e583a5d88d6bf190e079c4e43213d
>>
>> -dborca
>>
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