udhcp: fix indentation and style.

Eliminate (group) a lot of smallish *.h files
Remove lots of unneeded #includes

networking/udhcp/arpping.c

@@ -6,18 +6,31 @@
  * by Yoichi Hariguchi <yoichi@fore.com>
  */
 
-#include <time.h>
-#include <sys/socket.h>
 #include <netinet/if_ether.h>
 #include <net/if_arp.h>
-#include <netinet/in.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
 
-#include "dhcpd.h"
-#include "arpping.h"
 #include "common.h"
+#include "dhcpd.h"
+
+
+struct arpMsg {
+	/* Ethernet header */
+	u_char   h_dest[6];			/* destination ether addr */
+	u_char   h_source[6];			/* source ether addr */
+	u_short  h_proto;			/* packet type ID field */
+
+	/* ARP packet */
+	uint16_t htype;				/* hardware type (must be ARPHRD_ETHER) */
+	uint16_t ptype;				/* protocol type (must be ETH_P_IP) */
+	uint8_t  hlen;				/* hardware address length (must be 6) */
+	uint8_t  plen;				/* protocol address length (must be 4) */
+	uint16_t operation;			/* ARP opcode */
+	uint8_t  sHaddr[6];			/* sender's hardware address */
+	uint8_t  sInaddr[4];			/* sender's IP address */
+	uint8_t  tHaddr[6];			/* target's hardware address */
+	uint8_t  tInaddr[4];			/* target's IP address */
+	uint8_t  pad[18];			/* pad for min. Ethernet payload (60 bytes) */
+} ATTRIBUTE_PACKED;
 
 /* args:	yiaddr - what IP to ping
  *		ip - our ip