646cf5017b
identifier to the DHCP server. Now you can check for this string in your dhcp configuration to decide whether you will hand out a lease to the client or not.
287 lines
7.7 KiB
C
287 lines
7.7 KiB
C
/*
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* $FreeBSD$
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* From: $NetBSD: dev_net.c,v 1.12 1997/12/10 20:38:37 gwr Exp $
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*/
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This module implements a "raw device" interface suitable for
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* use by the stand-alone I/O library NFS code. This interface
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* does not support any "block" access, and exists only for the
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* purpose of initializing the network interface, getting boot
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* parameters, and performing the NFS mount.
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*
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* At open time, this does:
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*
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* find interface - netif_open()
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* RARP for IP address - rarp_getipaddress()
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* RPC/bootparams - callrpc(d, RPC_BOOTPARAMS, ...)
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* RPC/mountd - nfs_mount(sock, ip, path)
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*
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* the root file handle from mountd is saved in a global
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* for use by the NFS open code (NFS/lookup).
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*/
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#include <machine/stdarg.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <stand.h>
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#include <string.h>
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#include <net.h>
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#include <netif.h>
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#include <bootp.h>
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#include <bootparam.h>
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#include "dev_net.h"
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#include "bootstrap.h"
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int debug = 0;
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static int netdev_sock = -1;
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static int netdev_opens;
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static int net_init(void);
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static int net_open(struct open_file *, ...);
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static int net_close(struct open_file *);
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static int net_strategy();
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static int net_getparams(int sock);
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struct devsw netdev = {
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"net",
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DEVT_NET,
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net_init,
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net_strategy,
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net_open,
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net_close,
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noioctl
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};
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int
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net_init(void)
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{
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return 0;
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}
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/*
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* Called by devopen after it sets f->f_dev to our devsw entry.
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* This opens the low-level device and sets f->f_devdata.
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* This is declared with variable arguments...
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*/
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int
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net_open(struct open_file *f, ...)
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{
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va_list args;
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char *devname; /* Device part of file name (or NULL). */
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int error = 0;
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va_start(args, f);
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devname = va_arg(args, char*);
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va_end(args);
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/* On first open, do netif open, mount, etc. */
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if (netdev_opens == 0) {
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/* Find network interface. */
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if (netdev_sock < 0) {
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netdev_sock = netif_open(devname);
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if (netdev_sock < 0) {
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printf("net_open: netif_open() failed\n");
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return (ENXIO);
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}
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if (debug)
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printf("net_open: netif_open() succeeded\n");
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}
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if (rootip.s_addr == 0) {
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/* Get root IP address, and path, etc. */
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error = net_getparams(netdev_sock);
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if (error) {
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/* getparams makes its own noise */
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netif_close(netdev_sock);
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netdev_sock = -1;
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return (error);
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}
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}
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netdev_opens++;
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}
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netdev_opens++;
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f->f_devdata = &netdev_sock;
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return (error);
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}
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int
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net_close(f)
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struct open_file *f;
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{
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#ifdef NETIF_DEBUG
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if (debug)
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printf("net_close: opens=%d\n", netdev_opens);
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#endif
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/* On last close, do netif close, etc. */
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f->f_devdata = NULL;
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/* Extra close call? */
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if (netdev_opens <= 0)
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return (0);
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netdev_opens--;
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/* Not last close? */
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if (netdev_opens > 0)
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return(0);
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rootip.s_addr = 0;
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if (netdev_sock >= 0) {
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if (debug)
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printf("net_close: calling netif_close()\n");
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netif_close(netdev_sock);
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netdev_sock = -1;
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}
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return (0);
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}
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int
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net_strategy()
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{
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return EIO;
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}
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#define SUPPORT_BOOTP
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/*
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* Get info for NFS boot: our IP address, our hostname,
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* server IP address, and our root path on the server.
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* There are two ways to do this: The old, Sun way,
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* and the more modern, BOOTP way. (RFC951, RFC1048)
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*
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* The default is to use the Sun bootparams RPC
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* (because that is what the kernel will do).
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* MD code can make try_bootp initialied data,
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* which will override this common definition.
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*/
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#ifdef SUPPORT_BOOTP
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int try_bootp = 1;
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#endif
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extern n_long ip_convertaddr(char *p);
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static int
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net_getparams(sock)
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int sock;
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{
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char buf[MAXHOSTNAMELEN];
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char temp[FNAME_SIZE];
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int i;
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n_long smask;
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#ifdef SUPPORT_BOOTP
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/*
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* Try to get boot info using BOOTP. If we succeed, then
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* the server IP address, gateway, and root path will all
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* be initialized. If any remain uninitialized, we will
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* use RARP and RPC/bootparam (the Sun way) to get them.
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*/
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if (try_bootp)
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bootp(sock, BOOTP_NONE);
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if (myip.s_addr != 0)
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goto exit;
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if (debug)
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printf("net_open: BOOTP failed, trying RARP/RPC...\n");
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#endif
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/*
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* Use RARP to get our IP address. This also sets our
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* netmask to the "natural" default for our address.
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*/
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if (rarp_getipaddress(sock)) {
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printf("net_open: RARP failed\n");
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return (EIO);
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}
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printf("net_open: client addr: %s\n", inet_ntoa(myip));
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/* Get our hostname, server IP address, gateway. */
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if (bp_whoami(sock)) {
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printf("net_open: bootparam/whoami RPC failed\n");
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return (EIO);
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}
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printf("net_open: client name: %s\n", hostname);
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/*
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* Ignore the gateway from whoami (unreliable).
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* Use the "gateway" parameter instead.
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*/
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smask = 0;
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gateip.s_addr = 0;
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if (bp_getfile(sock, "gateway", &gateip, buf) == 0) {
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/* Got it! Parse the netmask. */
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smask = ip_convertaddr(buf);
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}
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if (smask) {
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netmask = smask;
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printf("net_open: subnet mask: %s\n", intoa(netmask));
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}
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if (gateip.s_addr)
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printf("net_open: net gateway: %s\n", inet_ntoa(gateip));
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/* Get the root server and pathname. */
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if (bp_getfile(sock, "root", &rootip, rootpath)) {
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printf("net_open: bootparam/getfile RPC failed\n");
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return (EIO);
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}
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exit:
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printf("net_open: server addr: %s\n", inet_ntoa(rootip));
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/*
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* If present, strip the server's address off of the rootpath
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* before passing it along. This allows us to be compatible with
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* the kernel's diskless (BOOTP_NFSROOT) booting conventions
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*/
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for(i=0; i<FNAME_SIZE; i++)
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if(rootpath[i] == ':')
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break;
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if(i && i != FNAME_SIZE) {
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i++;
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bcopy(&rootpath[i], &temp[0], strlen(&rootpath[i])+1);
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bcopy(&temp[0], &rootpath[0], strlen(&rootpath[i])+1);
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}
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printf("net_open: server path: %s\n", rootpath);
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return (0);
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}
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