Move files to match FreeBSD layout

1 files changed, 416 insertions, 0 deletions

diff --git a/freebsd/sbin/dhclient/bpf.c b/freebsd/sbin/dhclient/bpf.c
new file mode 100644
index 00000000..7f87ddf5
--- /dev/null
+++ b/freebsd/sbin/dhclient/bpf.c
@@ -0,0 +1,416 @@
+/*	$OpenBSD: bpf.c,v 1.13 2004/05/05 14:28:58 deraadt Exp $	*/
+
+/* BPF socket interface code, originally contributed by Archie Cobbs. */
+
+/*
+ * 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''.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "dhcpd.h"
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+
+#ifdef __rtems__
+#include <freebsd/net/bpf.h>
+#include <freebsd/netinet/in_systm.h>
+#else
+#include <net/bpf.h>
+#include <netinet/in_systm.h>
+#endif
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+#include <netinet/if_ether.h>
+
+#define BPF_FORMAT "/dev/bpf%d"
+
+/*
+ * 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_bpf(struct interface_info *info)
+{
+	char filename[50];
+	int sock, b;
+
+	/* Open a BPF device */
+	for (b = 0; 1; b++) {
+		snprintf(filename, sizeof(filename), BPF_FORMAT, b);
+		sock = open(filename, O_RDWR, 0);
+		if (sock < 0) {
+			if (errno == EBUSY)
+				continue;
+			else
+				error("Can't find free bpf: %m");
+		} else
+			break;
+	}
+
+	/* Set the BPF device to point at this interface. */
+	if (ioctl(sock, BIOCSETIF, info->ifp) < 0)
+		error("Can't attach interface %s to bpf device %s: %m",
+		    info->name, filename);
+
+	return (sock);
+}
+
+void
+if_register_send(struct interface_info *info)
+{
+	int sock, on = 1;
+
+	/*
+	 * If we're using the bpf API for sending and receiving, we
+	 * don't need to register this interface twice.
+	 */
+	info->wfdesc = info->rfdesc;
+
+	/*
+	 * Use raw socket for unicast send.
+	 */
+	if ((sock = socket(AF_INET, SOCK_RAW, IPPROTO_UDP)) == -1)
+		error("socket(SOCK_RAW): %m");
+	if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, &on,
+	    sizeof(on)) == -1)
+		error("setsockopt(IP_HDRINCL): %m");
+	info->ufdesc = sock;
+}
+
+/*
+ * Packet filter program...
+ *
+ * XXX: Changes to the filter program may require changes to the
+ * constant offsets used in if_register_send to patch the BPF program!
+ */
+struct bpf_insn dhcp_bpf_filter[] = {
+	/* Make sure this is an IP packet... */
+	BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 12),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 0, 8),
+
+	/* Make sure it's a UDP packet... */
+	BPF_STMT(BPF_LD + BPF_B + BPF_ABS, 23),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 0, 6),
+
+	/* Make sure this isn't a fragment... */
+	BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 20),
+	BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, 0x1fff, 4, 0),
+
+	/* Get the IP header length... */
+	BPF_STMT(BPF_LDX + BPF_B + BPF_MSH, 14),
+
+	/* Make sure it's to the right port... */
+	BPF_STMT(BPF_LD + BPF_H + BPF_IND, 16),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 67, 0, 1),		/* patch */
+
+	/* If we passed all the tests, ask for the whole packet. */
+	BPF_STMT(BPF_RET+BPF_K, (u_int)-1),
+
+	/* Otherwise, drop it. */
+	BPF_STMT(BPF_RET+BPF_K, 0),
+};
+
+int dhcp_bpf_filter_len = sizeof(dhcp_bpf_filter) / sizeof(struct bpf_insn);
+
+/*
+ * Packet write filter program:
+ * 'ip and udp and src port bootps and dst port (bootps or bootpc)'
+ */
+struct bpf_insn dhcp_bpf_wfilter[] = {
+	BPF_STMT(BPF_LD + BPF_B + BPF_IND, 14),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, (IPVERSION << 4) + 5, 0, 12),
+
+	/* Make sure this is an IP packet... */
+	BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 12),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_IP, 0, 10),
+
+	/* Make sure it's a UDP packet... */
+	BPF_STMT(BPF_LD + BPF_B + BPF_ABS, 23),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_UDP, 0, 8),
+
+	/* Make sure this isn't a fragment... */
+	BPF_STMT(BPF_LD + BPF_H + BPF_ABS, 20),
+	BPF_JUMP(BPF_JMP + BPF_JSET + BPF_K, 0x1fff, 6, 0),	/* patched */
+
+	/* Get the IP header length... */
+	BPF_STMT(BPF_LDX + BPF_B + BPF_MSH, 14),
+
+	/* Make sure it's from the right port... */
+	BPF_STMT(BPF_LD + BPF_H + BPF_IND, 14),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 68, 0, 3),
+
+	/* Make sure it is to the right ports ... */
+	BPF_STMT(BPF_LD + BPF_H + BPF_IND, 16),
+	BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 67, 0, 1),
+
+	/* If we passed all the tests, ask for the whole packet. */
+	BPF_STMT(BPF_RET+BPF_K, (u_int)-1),
+
+	/* Otherwise, drop it. */
+	BPF_STMT(BPF_RET+BPF_K, 0),
+};
+
+int dhcp_bpf_wfilter_len = sizeof(dhcp_bpf_wfilter) / sizeof(struct bpf_insn);
+
+void
+if_register_receive(struct interface_info *info)
+{
+	struct bpf_version v;
+	struct bpf_program p;
+	int flag = 1, sz;
+
+	/* Open a BPF device and hang it on this interface... */
+	info->rfdesc = if_register_bpf(info);
+
+	/* Make sure the BPF version is in range... */
+	if (ioctl(info->rfdesc, BIOCVERSION, &v) < 0)
+		error("Can't get BPF version: %m");
+
+	if (v.bv_major != BPF_MAJOR_VERSION ||
+	    v.bv_minor < BPF_MINOR_VERSION)
+		error("Kernel BPF version out of range - recompile dhcpd!");
+
+	/*
+	 * Set immediate mode so that reads return as soon as a packet
+	 * comes in, rather than waiting for the input buffer to fill
+	 * with packets.
+	 */
+	if (ioctl(info->rfdesc, BIOCIMMEDIATE, &flag) < 0)
+		error("Can't set immediate mode on bpf device: %m");
+
+	/* Get the required BPF buffer length from the kernel. */
+	if (ioctl(info->rfdesc, BIOCGBLEN, &sz) < 0)
+		error("Can't get bpf buffer length: %m");
+	info->rbuf_max = sz;
+	info->rbuf = malloc(info->rbuf_max);
+	if (!info->rbuf)
+		error("Can't allocate %lu bytes for bpf input buffer.",
+		    (unsigned long)info->rbuf_max);
+	info->rbuf_offset = 0;
+	info->rbuf_len = 0;
+
+	/* Set up the bpf filter program structure. */
+	p.bf_len = dhcp_bpf_filter_len;
+	p.bf_insns = dhcp_bpf_filter;
+
+	/* Patch the server port into the BPF program...
+	 *
+	 * XXX: changes to filter program may require changes to the
+	 * insn number(s) used below!
+	 */
+	dhcp_bpf_filter[8].k = LOCAL_PORT;
+
+	if (ioctl(info->rfdesc, BIOCSETF, &p) < 0)
+		error("Can't install packet filter program: %m");
+
+	/* Set up the bpf write filter program structure. */
+	p.bf_len = dhcp_bpf_wfilter_len;
+	p.bf_insns = dhcp_bpf_wfilter;
+
+	if (dhcp_bpf_wfilter[7].k == 0x1fff)
+		dhcp_bpf_wfilter[7].k = htons(IP_MF|IP_OFFMASK);
+
+	if (ioctl(info->rfdesc, BIOCSETWF, &p) < 0)
+		error("Can't install write filter program: %m");
+
+	if (ioctl(info->rfdesc, BIOCLOCK, NULL) < 0)
+		error("Cannot lock bpf");
+}
+
+ssize_t
+send_packet(struct interface_info *interface, struct dhcp_packet *raw,
+    size_t len, struct in_addr from, struct sockaddr_in *to,
+    struct hardware *hto)
+{
+	unsigned char buf[256];
+	struct iovec iov[2];
+	struct msghdr msg;
+	int result, bufp = 0;
+
+	/* Assemble the headers... */
+	if (to->sin_addr.s_addr == INADDR_BROADCAST)
+		assemble_hw_header(interface, buf, &bufp, hto);
+	assemble_udp_ip_header(buf, &bufp, from.s_addr,
+	    to->sin_addr.s_addr, to->sin_port, (unsigned char *)raw, len);
+
+	iov[0].iov_base = (char *)buf;
+	iov[0].iov_len = bufp;
+	iov[1].iov_base = (char *)raw;
+	iov[1].iov_len = len;
+
+	/* Fire it off */
+	if (to->sin_addr.s_addr == INADDR_BROADCAST)
+		result = writev(interface->wfdesc, iov, 2);
+	else {
+		memset(&msg, 0, sizeof(msg));
+		msg.msg_name = (struct sockaddr *)to;
+		msg.msg_namelen = sizeof(*to);
+		msg.msg_iov = iov;
+		msg.msg_iovlen = 2;
+		result = sendmsg(interface->ufdesc, &msg, 0);
+	}
+
+	if (result < 0)
+		warning("send_packet: %m");
+	return (result);
+}
+
+ssize_t
+receive_packet(struct interface_info *interface, unsigned char *buf,
+    size_t len, struct sockaddr_in *from, struct hardware *hfrom)
+{
+	int length = 0, offset = 0;
+	struct bpf_hdr hdr;
+
+	/*
+	 * All this complexity is because BPF doesn't guarantee that
+	 * only one packet will be returned at a time.  We're getting
+	 * what we deserve, though - this is a terrible abuse of the BPF
+	 * interface.  Sigh.
+	 */
+
+	/* Process packets until we get one we can return or until we've
+	 * done a read and gotten nothing we can return...
+	 */
+	do {
+		/* If the buffer is empty, fill it. */
+		if (interface->rbuf_offset >= interface->rbuf_len) {
+			length = read(interface->rfdesc, interface->rbuf,
+			    interface->rbuf_max);
+			if (length <= 0)
+				return (length);
+			interface->rbuf_offset = 0;
+			interface->rbuf_len = length;
+		}
+
+		/*
+		 * If there isn't room for a whole bpf header, something
+		 * went wrong, but we'll ignore it and hope it goes
+		 * away... XXX
+		 */
+		if (interface->rbuf_len - interface->rbuf_offset <
+		    sizeof(hdr)) {
+			interface->rbuf_offset = interface->rbuf_len;
+			continue;
+		}
+
+		/* Copy out a bpf header... */
+		memcpy(&hdr, &interface->rbuf[interface->rbuf_offset],
+		    sizeof(hdr));
+
+		/*
+		 * If the bpf header plus data doesn't fit in what's
+		 * left of the buffer, stick head in sand yet again...
+		 */
+		if (interface->rbuf_offset + hdr.bh_hdrlen + hdr.bh_caplen >
+		    interface->rbuf_len) {
+			interface->rbuf_offset = interface->rbuf_len;
+			continue;
+		}
+
+		/* Skip over the BPF header... */
+		interface->rbuf_offset += hdr.bh_hdrlen;
+
+		/*
+		 * If the captured data wasn't the whole packet, or if
+		 * the packet won't fit in the input buffer, all we can
+		 * do is drop it.
+		 */
+		if (hdr.bh_caplen != hdr.bh_datalen) {
+			interface->rbuf_offset =
+			    BPF_WORDALIGN(interface->rbuf_offset +
+			    hdr.bh_caplen);
+			continue;
+		}
+
+		/* Decode the physical header... */
+		offset = decode_hw_header(interface->rbuf,
+		    interface->rbuf_offset, hfrom);
+
+		/*
+		 * If a physical layer checksum failed (dunno of any
+		 * physical layer that supports this, but WTH), skip
+		 * this packet.
+		 */
+		if (offset < 0) {
+			interface->rbuf_offset =
+			    BPF_WORDALIGN(interface->rbuf_offset +
+			    hdr.bh_caplen);
+			continue;
+		}
+		interface->rbuf_offset += offset;
+		hdr.bh_caplen -= offset;
+
+		/* Decode the IP and UDP headers... */
+		offset = decode_udp_ip_header(interface->rbuf,
+		    interface->rbuf_offset, from, NULL, hdr.bh_caplen);
+
+		/* If the IP or UDP checksum was bad, skip the packet... */
+		if (offset < 0) {
+			interface->rbuf_offset =
+			    BPF_WORDALIGN(interface->rbuf_offset +
+			    hdr.bh_caplen);
+			continue;
+		}
+		interface->rbuf_offset += offset;
+		hdr.bh_caplen -= offset;
+
+		/*
+		 * If there's not enough room to stash the packet data,
+		 * we have to skip it (this shouldn't happen in real
+		 * life, though).
+		 */
+		if (hdr.bh_caplen > len) {
+			interface->rbuf_offset =
+			    BPF_WORDALIGN(interface->rbuf_offset +
+			    hdr.bh_caplen);
+			continue;
+		}
+
+		/* Copy out the data in the packet... */
+		memcpy(buf, interface->rbuf + interface->rbuf_offset,
+		    hdr.bh_caplen);
+		interface->rbuf_offset =
+		    BPF_WORDALIGN(interface->rbuf_offset +
+		    hdr.bh_caplen);
+		return (hdr.bh_caplen);
+	} while (!length);
+	return (0);
+}