Make ipv4 addresses unsigned in kernel interface.

kernel.h

@@ -38,7 +38,8 @@ int kernel_setup(int setup, int ipv4);
 int kernel_setup_socket(int setup);
 int kernel_setup_interface(int setup, const char *ifname, int ifindex);
 int kernel_interface_operational(const char *ifname, int ifindex);
-int kernel_interface_ipv4(const char *ifname, int ifindex, char *addr_r);
+int kernel_interface_ipv4(const char *ifname, int ifindex,
+                          unsigned char *addr_r);
 int kernel_interface_mtu(const char *ifname, int ifindex);
 int kernel_interface_wireless(const char *ifname, int ifindex);
 int kernel_route(int operation, const unsigned char *dest, unsigned short plen,

kernel_netlink.c

@@ -557,7 +557,7 @@ kernel_interface_operational(const char *ifname, int ifindex)
 }
 
 int
-kernel_interface_ipv4(const char *ifname, int ifindex, char *addr_r)
+kernel_interface_ipv4(const char *ifname, int ifindex, unsigned char *addr_r)
 {
     struct ifreq req;
     int rc;

kernel_socket.c

@@ -227,7 +227,7 @@ kernel_interface_operational(const char *ifname, int ifindex)
 }
 
 int
-kernel_interface_ipv4(const char *ifname, int ifindex, char *addr_r)
+kernel_interface_ipv4(const char *ifname, int ifindex, unsigned char *addr_r)
 {
     struct ifreq req;
     int s, rc;

network.c

@@ -39,7 +39,7 @@ struct network *
 add_network(char *ifname, int ifindex, int mtu, int wired, unsigned int cost)
 {
     void *p;
-    char ipv4[4];
+    unsigned char ipv4[4];
     int rc;
 
     if(numnets >= MAXNETS) {