DHCP Server Daemon

1 files changed, 147 insertions, 0 deletions

diff --git a/server/bootp.c b/server/bootp.c
new file mode 100644
index 00000000..6f5d1a5b
--- /dev/null
+++ b/server/bootp.c
@@ -0,0 +1,147 @@
+/* bootp.c
+
+   BOOTP Protocol support. */
+
+/*
+ * Copyright (c) 1995 The Internet Software Consortium.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of The Internet Software Consortium nor the names
+ *    of its contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
+ * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This software has been written for the Internet Software Consortium
+ * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
+ * Enterprises.  To learn more about the Internet Software Consortium,
+ * see ``http://www.vix.com/isc''.  To learn more about Vixie
+ * Enterprises, see ``http://www.vix.com''.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1995 The Internet Software Consortium.  All rights reserved.\n";
+#endif /* not lint */
+
+#include "dhcpd.h"
+
+void bootp (packet)
+	struct packet *packet;
+{
+	int result;
+	struct host_decl *hp = find_host_by_addr (packet -> raw -> htype,
+						  packet -> raw -> chaddr,
+						  packet -> raw -> hlen);
+	struct dhcp_packet *reply;
+	struct sockaddr_in to;
+
+	/* If the packet is from a host we don't know, drop it on
+	   the floor. XXX */
+	if (!hp) {
+		note ("Can't find record for BOOTP host %s",
+		      print_hw_addr (packet -> raw -> htype,
+				     packet -> raw -> hlen,
+				     packet -> raw -> chaddr));
+		return;
+	}
+	/* If we don't have a fixed address for it, drop it on the floor.
+	   XXX */
+	if (!hp -> fixed_addr || !tree_evaluate (hp -> fixed_addr)) {
+		note ("No fixed address for BOOTP host %s (%s)",
+		      print_hw_addr (packet -> raw -> htype,
+				     packet -> raw -> hlen,
+				     packet -> raw -> chaddr),
+		      hp -> name);
+		return;
+	}
+	reply = new_dhcp_packet ("bootp");
+	if (!reply) {
+		free_dhcp_packet (packet -> raw, "bootp");
+		free_packet (packet, "bootp");
+		return;
+	}
+	/* Take the fields that we care about... */
+	reply -> op = BOOTREPLY;
+	reply -> htype = packet -> raw -> htype;
+	reply -> hlen = packet -> raw -> hlen;
+	memcpy (reply -> chaddr, packet -> raw -> chaddr, reply -> hlen);
+	memset (&reply -> chaddr [reply -> hlen], 0,
+		(sizeof reply -> chaddr) - reply -> hlen);
+	reply -> hops = packet -> raw -> hops;
+	reply -> xid = packet -> raw -> xid;
+	reply -> secs = packet -> raw -> secs;
+	reply -> flags = 0;
+	reply -> ciaddr = packet -> raw -> ciaddr;
+	if (!tree_evaluate (hp -> fixed_addr))
+		warn ("tree_evaluate failed.");
+	debug ("fixed_addr: %x %d %d %d %d %x",
+	       *(int *)(hp -> fixed_addr -> value), hp -> fixed_addr -> len,
+	       hp -> fixed_addr -> buf_size, hp -> fixed_addr -> timeout,
+	       hp -> fixed_addr -> tree);
+	memcpy (&reply -> yiaddr, hp -> fixed_addr -> value,
+		sizeof reply -> yiaddr);
+	reply -> siaddr.s_addr = pick_interface (packet);
+	reply -> giaddr = packet -> raw -> giaddr;
+	if (hp -> server_name) {
+		strncpy (reply -> sname, hp -> server_name,
+			 (sizeof reply -> sname) - 1);
+		reply -> sname [(sizeof reply -> sname) - 1] = 0;
+	}
+	if (hp -> filename) {
+		strncpy (reply -> file, hp -> filename,
+			 (sizeof reply -> file) - 1);
+		reply -> file [(sizeof reply -> file) - 1] = 0;
+	}
+	reply -> options [0] = 0;
+	/* XXX gateways? */
+	to.sin_port = server_port;
+
+#if 0
+	if (packet -> raw -> flags & BOOTP_BROADCAST)
+#endif
+		to.sin_addr.s_addr = INADDR_BROADCAST;
+#if 0
+	else
+		to.sin_addr.s_addr = INADDR_ANY;
+#endif
+
+	memset (reply -> options, 0, sizeof (reply -> options));
+	/* If we got the magic cookie, send it back. */
+	if (packet -> options_valid)
+		memcpy (reply -> options, packet -> raw -> options, 4);
+	to.sin_port = packet -> client.sin_port;
+	to.sin_family = AF_INET;
+	to.sin_len = sizeof to;
+	memset (to.sin_zero, 0, sizeof to.sin_zero);
+
+	note ("Sending bootp reply to %s, port %d",
+	      inet_ntoa (to.sin_addr), htons (to.sin_port));
+
+	errno = 0;
+	result = sendto (packet -> client_sock, reply,
+			 ((char *)(&reply -> options) - (char *)reply) + 64,
+			 0, (struct sockaddr *)&to, sizeof to);
+	if (result < 0)
+		warn ("sendto: %m");
+}