Finish remerging busybox udhcp and udhcp. Some cleanups as well.

networking/udhcp/clientsocket.c

@@ -0,0 +1,62 @@
+/*
+ * clientsocket.c -- DHCP client socket creation
+ *
+ * udhcp client
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <features.h>
+#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#else
+#include <asm/types.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#endif
+
+#include "clientsocket.h"
+#include "common.h"
+
+
+int raw_socket(int ifindex)
+{
+	int fd;
+	struct sockaddr_ll sock;
+
+	DEBUG(LOG_INFO, "Opening raw socket on ifindex %d", ifindex);
+	if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
+		DEBUG(LOG_ERR, "socket call failed: %m");
+		return -1;
+	}
+
+	sock.sll_family = AF_PACKET;
+	sock.sll_protocol = htons(ETH_P_IP);
+	sock.sll_ifindex = ifindex;
+	if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
+		DEBUG(LOG_ERR, "bind call failed: %m");
+		close(fd);
+		return -1;
+	}
+
+	return fd;
+}