Re: ICMP socket with Gambas

[Linus <olivier.cruilles@xxxxxxxx>]

Hello Lee,

Thank you for your comment and research and yes I knew about the need to be root to run the code.
A lot a network command on Linux require the ‘root’ access but I was not aware about the SOCK_DGRAM option.

Unfortunately, in the end, for now, no way to do an ICMP request in Gambas…

I will wait the answer from Benoit, about if is possible to do something on this way.

Olivier


> Le 27 juin 2025 à 13:17, Lee <t.lee.davidson@xxxxxxxxx> a écrit :
> 
> Apparently creating a raw socket requires root privileges, or at least the NET_CAP_RAW capability.
> 
> I get an "Operation not permitted" error: when running the compiled 'ping_cmd.c', when creating a raw socket with Python, and when creating a raw socket by executing the libc:6 `socket` function from Gambas.
> 
> The standard `ping` command gets around this by exploiting the kernel's support of non-raw ICMP sockets.[1]
> 
> So, I edited 'ping_cmd.c' (and my Gambas test project) to open the socket with:
> sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
> instead of:
> sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
> 
> 'ping_cmd' now works and I can create a socket from Gambas.
> 
> 
> Olivier, I don't understand how you were able to successfully execute the compiled 'ping_cmd.c' without getting that error. Dit you run it as root?
> 
> 
> [1] https://github.com/iputils/iputils/commit/87dbb3a5db657d5eae6934707beaf0507980a1c3#diff-3bbcff584f2ee1c8172d9e280209ebe4R702
> 
> 
> P.S. I had deleted the messages in this thread, and my last reply was somehow not saved in the Sent folder. I apologize for posting out-of-thread.
> 
> 
> -- 
> Lee
> 
> --- Gambas User List Netiquette [https://gambaswiki.org/wiki/doc/netiquette] ----
> --- Gambas User List Archive [https://lists.gambas-basic.org/archive/user] ----
> 
>