owfd: dhcp: print warning if not running as euid=0

DHCP and interface-setup requires CAP_NET_ADMIN. As we don't want to deal
with libcap and capability-setup, we simply let the caller take care of
it.

To avoid mis-use, we print a warning for euid!=0, in case users run it
from the command-line (debugging, etc).

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/dhcp.c b/src/dhcp.c
index f564569..7eb93e6 100644
--- a/src/dhcp.c
+++ b/src/dhcp.c
@@ -118,6 +118,9 @@ static int owfd_dhcp_setup(struct owfd_dhcp *dhcp)
 	sigset_t mask;
 	struct sigaction sig;
 
+	if (geteuid())
+		log_warning("not running as uid=0, dhcp might not work");
+
 	dhcp->ifindex = if_name_to_index(dhcp->config.interface);
 	if (dhcp->ifindex < 0) {
 		r = -EINVAL;