Virgin import of ISC-DHCP v2.0b1pl11vendor/isc-dhcp/2.0b1-pl.11

1 files changed, 287 insertions, 0 deletions

diff --git a/contrib/isc-dhcp/common/lpf.c b/contrib/isc-dhcp/common/lpf.c
new file mode 100644
index 000000000000..7c6ff74d628e
--- /dev/null
+++ b/contrib/isc-dhcp/common/lpf.c
@@ -0,0 +1,287 @@
+/* lpf.c
+
+   Linux packet filter code, contributed by Brian Murrel at Interlinx
+   Support Services in Vancouver, B.C. */
+
+/*
+ * Copyright (c) 1995, 1996, 1998, 1999
+ * 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[] =
+"$Id: lpf.c,v 1.1.2.4 1999/02/09 04:51:05 mellon Exp $ Copyright (c) 1995, 1996, 1998, 1999 The Internet Software Consortium.  All rights reserved.\n";
+#endif /* not lint */
+
+#include "dhcpd.h"
+#if defined (USE_LPF_SEND) || defined (USE_LPF_RECEIVE)
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+
+#include <asm/types.h>
+#include <linux/filter.h>
+#include <linux/if_ether.h>
+#include <netinet/in_systm.h>
+#include "includes/netinet/ip.h"
+#include "includes/netinet/udp.h"
+#include "includes/netinet/if_ether.h"
+
+/* Reinitializes the specified interface after an address change.   This
+   is not required for packet-filter APIs. */
+
+#ifdef USE_LPF_SEND
+void if_reinitialize_send (info)
+	struct interface_info *info;
+{
+}
+#endif
+
+#ifdef USE_LPF_RECEIVE
+void if_reinitialize_receive (info)
+	struct interface_info *info;
+{
+}
+#endif
+
+/* Called by get_interface_list for each interface that's discovered.
+   Opens a packet filter for each interface and adds it to the select
+   mask. */
+
+int if_register_lpf (info)
+	struct interface_info *info;
+{
+	int sock;
+	char filename[50];
+	int b;
+	struct sockaddr sa;
+
+	/* Make an LPF socket. */
+	if ((sock = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ALL))) < 0) {
+		if (errno == ENOPROTOOPT || errno == EPROTONOSUPPORT ||
+		    errno == ESOCKTNOSUPPORT || errno == EPFNOSUPPORT ||
+		    errno == EAFNOSUPPORT)
+			error ("socket: %m - make sure %s %s!",
+			       "CONFIG_PACKET and CONFIG_FILTER are defined",
+			       "in your kernel configuration");
+		error("Open a socket for LPF: %m");
+	}
+
+	/* Bind to the interface name */
+	memset (&sa, 0, sizeof sa);
+	sa.sa_family = AF_PACKET;
+	strncpy (sa.sa_data, (const char *)info -> ifp, sizeof sa.sa_data);
+	if (bind (sock, &sa, sizeof sa)) {
+		if (errno == ENOPROTOOPT || errno == EPROTONOSUPPORT ||
+		    errno == ESOCKTNOSUPPORT || errno == EPFNOSUPPORT ||
+		    errno == EAFNOSUPPORT)
+			error ("socket: %m - make sure %s %s!",
+			       "CONFIG_PACKET and CONFIG_FILTER are defined",
+			       "in your kernel configuration");
+		error("Bind socket to interface: %m");
+	}
+
+	return sock;
+}
+#endif /* USE_LPF_SEND || USE_LPF_RECEIVE */
+
+#ifdef USE_LPF_SEND
+void if_register_send (info)
+	struct interface_info *info;
+{
+	/* If we're using the lpf API for sending and receiving,
+	   we don't need to register this interface twice. */
+#ifndef USE_LPF_RECEIVE
+	info -> wfdesc = if_register_lpf (info, interface);
+#else
+	info -> wfdesc = info -> rfdesc;
+#endif
+	if (!quiet_interface_discovery)
+		note ("Sending on   LPF/%s/%s/%s",
+		      info -> name,
+		      print_hw_addr (info -> hw_address.htype,
+				     info -> hw_address.hlen,
+				     info -> hw_address.haddr),
+		      (info -> shared_network ?
+		       info -> shared_network -> name : "unattached"));
+}
+#endif /* USE_LPF_SEND */
+
+#ifdef USE_LPF_RECEIVE
+/* Defined in bpf.c.   We can't extern these in dhcpd.h without pulling
+   in bpf includes... */
+extern struct sock_filter dhcp_bpf_filter [];
+extern int dhcp_bpf_filter_len;
+
+void if_register_receive (info)
+	struct interface_info *info;
+{
+	struct sock_fprog p;
+
+	/* Open a LPF device and hang it on this interface... */
+	info -> rfdesc = if_register_lpf (info);
+
+	/* Set up the bpf filter program structure.    This is defined in
+	   bpf.c */
+	p.len = dhcp_bpf_filter_len;
+	p.filter = dhcp_bpf_filter;
+
+        /* Patch the server port into the LPF  program...
+	   XXX changes to filter program may require changes
+	   to the insn number(s) used below! XXX */
+	dhcp_bpf_filter [8].k = ntohs (local_port);
+
+	if (setsockopt (info -> rfdesc, SOL_SOCKET, SO_ATTACH_FILTER, &p,
+			sizeof p) < 0) {
+		if (errno == ENOPROTOOPT || errno == EPROTONOSUPPORT ||
+		    errno == ESOCKTNOSUPPORT || errno == EPFNOSUPPORT ||
+		    errno == EAFNOSUPPORT)
+			error ("socket: %m - make sure %s %s!",
+			       "CONFIG_PACKET and CONFIG_FILTER are defined",
+			       "in your kernel configuration");
+		error ("Can't install packet filter program: %m");
+	}
+	if (!quiet_interface_discovery)
+		note ("Listening on LPF/%s/%s/%s",
+		      info -> name,
+		      print_hw_addr (info -> hw_address.htype,
+				     info -> hw_address.hlen,
+				     info -> hw_address.haddr),
+		      (info -> shared_network ?
+		       info -> shared_network -> name : "unattached"));
+}
+#endif /* USE_LPF_RECEIVE */
+
+#ifdef USE_LPF_SEND
+ssize_t send_packet (interface, packet, raw, len, from, to, hto)
+	struct interface_info *interface;
+	struct packet *packet;
+	struct dhcp_packet *raw;
+	size_t len;
+	struct in_addr from;
+	struct sockaddr_in *to;
+	struct hardware *hto;
+{
+	int bufp = 0;
+	unsigned char buf [1500];
+	struct sockaddr sa;
+
+	if (!strcmp (interface -> name, "fallback"))
+		return send_fallback (interface, packet, raw,
+				      len, from, to, hto);
+
+	/* Assemble the headers... */
+	assemble_hw_header (interface, buf, &bufp, hto);
+	assemble_udp_ip_header (interface, buf, &bufp, from.s_addr,
+				to -> sin_addr.s_addr, to -> sin_port,
+				(unsigned char *)raw, len);
+	memcpy (buf + bufp, raw, len);
+
+	/* For some reason, SOCK_PACKET sockets can't be connected,
+	   so we have to do a sentdo every time. */
+	memset (&sa, 0, sizeof sa);
+	sa.sa_family = AF_PACKET;
+	strncpy (sa.sa_data,
+		 (const char *)interface -> ifp, sizeof sa.sa_data);
+
+	return sendto (interface -> wfdesc, buf, bufp + len, 0,
+		       &sa, sizeof sa);
+}
+#endif /* USE_LPF_SEND */
+
+#ifdef USE_LPF_RECEIVE
+ssize_t receive_packet (interface, buf, len, from, hfrom)
+	struct interface_info *interface;
+	unsigned char *buf;
+	size_t len;
+	struct sockaddr_in *from;
+	struct hardware *hfrom;
+{
+	int nread;
+	int length = 0;
+	int offset = 0;
+	unsigned char ibuf [1500];
+	int bufix = 0;
+
+	length = read (interface -> rfdesc, ibuf, sizeof ibuf);
+	if (length <= 0)
+		return length;
+
+	bufix = 0;
+	/* Decode the physical header... */
+	offset = decode_hw_header (interface, ibuf, bufix, hfrom);
+
+	/* If a physical layer checksum failed (dunno of any
+	   physical layer that supports this, but WTH), skip this
+	   packet. */
+	if (offset < 0) {
+		return 0;
+	}
+
+	bufix += offset;
+	length -= offset;
+
+	/* Decode the IP and UDP headers... */
+	offset = decode_udp_ip_header (interface, ibuf, bufix,
+				       from, (unsigned char *)0, length);
+
+	/* If the IP or UDP checksum was bad, skip the packet... */
+	if (offset < 0)
+		return 0;
+
+	bufix += offset;
+	length -= offset;
+
+	/* Copy out the data in the packet... */
+	memcpy (buf, &ibuf [bufix], length);
+	return length;
+}
+
+int can_unicast_without_arp ()
+{
+	return 1;
+}
+
+void maybe_setup_fallback ()
+{
+	struct interface_info *fbi;
+	fbi = setup_fallback ();
+	if (fbi) {
+		if_register_fallback (fbi);
+		add_protocol ("fallback", fallback_interface -> wfdesc,
+			      fallback_discard, fallback_interface);
+	}
+}
+#endif