odhcpd: make DHCPv6/RA/NDP support optional

In case IPv6 is not enabled don't try to init DHCPv6/RA and NDP but only
init DHCPv4. This allows odhcpd to start up in absence of IPv6 support.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

diff --git a/src/odhcpd.c b/src/odhcpd.c
index c1d51e7c717f5c1a1d655098add19b949915f667..bb7aba64f1a9b2d6a88a386138336e4ac03e42a3 100644 (file)
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -53,7 +53,6 @@ static void sighandler(_unused int signal)
        uloop_end();
 }
 
-
 static void print_usage(const char *app)
 {
        printf(
@@ -64,6 +63,17 @@ static void print_usage(const char *app)
        );
 }
 
+static bool ipv6_enabled(void)
+{
+       int fd = socket(AF_INET6, SOCK_DGRAM, 0);
+
+       if (fd < 0)
+               return false;
+
+       close(fd);
+
+       return true;
+}
 
 int main(int argc, char **argv)
 {
@@ -104,16 +114,20 @@ int main(int argc, char **argv)
        if (netlink_init())
                return 4;
 
-       if (router_init())
-               return 4;
+       if (ipv6_enabled()) {
+               if (router_init())
+                       return 4;
 
-       if (dhcpv6_init())
-               return 4;
+               if (dhcpv6_init())
+                       return 4;
 
-       if (ndp_init())
+               if (ndp_init())
+                       return 4;
+       }
+#ifndef DHCPV4_SUPPORT
+       else
                return 4;
-
-#ifdef DHCPV4_SUPPORT
+#else
        if (dhcpv4_init())
                return 4;
 #endif