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From: Peter van Hooft on 4 Feb 2010 14:28
On 2010-02-03, Andrew Poelstra <apoelstra(a)localhost.localdomain> wrote:
> On 2010-02-03, Peter van Hooft <pjvh(a)xs4all.nl> wrote:
>>
>> Perhaps you need to be root to send to broadcast addresses?
>>
>> peter
>>
>
> I thought of this, but given that he successfully opened the
> socket, I assumed that he was root. In my experience socket()
> will fail if you pass it SO_BROADCAST and are not root.
>
> Andrew
>

I tried this on solaris and hp-ux as well, and there it also
works.
Since the code supplied didn't compile with g++, I changed it
to

#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <string>
#include <iostream>

using namespace std;

int main()
{
struct sockaddr_in addr;
int BrdcstSock;
int opt=1;
string message = "Hello, World!";

if ((BrdcstSock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
cerr << "PIDClient: Error creating socket:"<< strerror(errno)
<< endl;
return -1;
}
if(setsockopt(BrdcstSock,SOL_SOCKET,SO_BROADCAST,&opt,sizeof(opt))){
cerr << "Error setsockopt():" << strerror(errno) << endl;
return -1;
}
memset(&addr,0x00,sizeof(addr));

addr.sin_family = AF_INET;

addr.sin_addr.s_addr = inet_addr("192.168.2.255");
addr.sin_port=htons(6767);
while (1) {
if (sendto(BrdcstSock, message.c_str(), strlen(message.c_str()), 0,
(struct sockaddr *) &addr, sizeof(addr)) != message.size()){
cerr << "Error sendto():" << strerror(errno) << endl;
return -1;
}
else
{
cout << "sent:" << message << endl;
}
sleep(3);
}
return 0;
}

and this works on my (linux) laptop, running as a normal user.

Could it be that, agains the rules, OP is running with something
different than 192.168.101.0/24?

peter

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