pcap_lookupdev returning NULL

[Vaughan Wickham via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Vaughan Wickham <vw () zen net au>
>
> Date: Thu, 5 Nov 2020 01:30:34 +0000
>
> Hello,
>
> I am a pcap newbie, so this is certain to be a mistake on my part; I'm just looking for advice on where to look.
>
> When I run the following code:
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <pcap.h>
>
>                 int main(int argc, char *argv[])
>                 {
>                                 char *dev, errbuf[PCAP_ERRBUF_SIZE];
>
>                                 dev = pcap_lookupdev(errbuf);
>                                 if (dev == NULL)
>                                 {
>                                                 fprintf(stderr, "Couldn't find default device: %s\n", errbuf);
>                                                 return(2);
>                                 }
>                                 printf("Device: %s\n", dev);
>                                 return(0);
>                 }
>
> dev == NULL
>
> dev should be eth0
>
> I'm using CentOS v7
>
> The following packages are installed
>
>
>   *   libpcap.x86_64
>   *   libpcap-devel.x86_64
>
> Would appreciate suggestions on what else to check / try?
>
> Regards,
> Vaughan
>
> --- End Message ---
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