Allow resolv.conf be written by dhclient

When dhclient is used to assign and IP to the container,
it should be able to overwrite resolv.conf

Therefore, we do the /etc mirroring similarly to the situation with
manually configured nameservers.

When both DHCP and manually set nameservers are in use,
warn that the manual ones will be overwritten

1 files changed, 18 insertions, 0 deletions

diff --git a/src/firejail/firejail.h b/src/firejail/firejail.h
index a5eeb4067..bfe680d24 100644
--- a/src/firejail/firejail.h
+++ b/src/firejail/firejail.h
@@ -239,6 +239,24 @@ static inline int any_interface_configured(void) {
                 return 0;
 }
 
+static inline int any_ip_dhcp(void) {
+        if (cfg.bridge0.arg_ip_dhcp || cfg.bridge1.arg_ip_dhcp || cfg.bridge2.arg_ip_dhcp || cfg.bridge3.arg_ip_dhcp)
+                return 1;
+        else
+                return 0;
+}
+
+static inline int any_ip6_dhcp(void) {
+        if (cfg.bridge0.arg_ip6_dhcp || cfg.bridge1.arg_ip6_dhcp || cfg.bridge2.arg_ip6_dhcp || cfg.bridge3.arg_ip6_dhcp)
+                return 1;
+        else
+                return 0;
+}
+
+static inline int any_dhcp(void) {
+  return any_ip_dhcp() || any_ip6_dhcp();
+}
+
 extern int arg_private;         // mount private /home
 extern int arg_private_cache;   // private home/.cache
 extern int arg_debug;           // print debug messages