- creates proper ifc.h and dhcp.h headers for libnetutils
- adds ifc_set_hwaddr
- adds hwaddr command to netcfg
- code reuse: dhcp_configure calls ifc_configure; inet_ntoa is used for printing
- consistency: use net.XXX.dnsX properties in favor of dhcp.XXX.dnsX properties
  (see related change to WifiStateTracker)
- updated system/core/nexus to use new headers, although not sure if
anybody still uses nexus

Change-Id: Idd70c0ac6e89b38e86816578c33eff805d30cac4
diff --git a/include/netutils/dhcp.h b/include/netutils/dhcp.h
new file mode 100644
index 0000000..96798c5
--- /dev/null
+++ b/include/netutils/dhcp.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License. 
+ * You may obtain a copy of the License at 
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0 
+ *
+ * Unless required by applicable law or agreed to in writing, software 
+ * distributed under the License is distributed on an "AS IS" BASIS, 
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+ * See the License for the specific language governing permissions and 
+ * limitations under the License.
+ */
+
+#ifndef _NETUTILS_DHCP_H_
+#define _NETUTILS_DHCP_H_
+
+#include <sys/cdefs.h>
+#include <arpa/inet.h>
+
+__BEGIN_DECLS
+
+extern int do_dhcp(char *iname);
+extern int dhcp_do_request(const char *ifname,
+                          in_addr_t *ipaddr,
+                          in_addr_t *gateway,
+                          in_addr_t *mask,
+                          in_addr_t *dns1,
+                          in_addr_t *dns2,
+                          in_addr_t *server,
+                          uint32_t  *lease);
+extern int dhcp_stop(const char *ifname);
+extern int dhcp_release_lease(const char *ifname);
+extern char *dhcp_get_errmsg();
+
+__END_DECLS
+
+#endif /* _NETUTILS_DHCP_H_ */