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415 lines
9.3 KiB
C
415 lines
9.3 KiB
C
/* $NetBSD: bootp.c,v 1.14 1998/02/16 11:10:54 drochner Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <string.h>
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#define BOOTP_DEBUGxx
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#define SUPPORT_DHCP
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#include "stand.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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struct in_addr servip;
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static n_long nmask, smask;
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static time_t bot;
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static char vm_rfc1048[4] = VM_RFC1048;
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#ifdef BOOTP_VEND_CMU
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static char vm_cmu[4] = VM_CMU;
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#endif
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/* Local forwards */
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static ssize_t bootpsend(struct iodesc *, void *, size_t);
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static ssize_t bootprecv(struct iodesc *, void *, size_t, time_t);
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static int vend_rfc1048(u_char *, u_int);
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#ifdef BOOTP_VEND_CMU
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static void vend_cmu(u_char *);
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#endif
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#ifdef SUPPORT_DHCP
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static char expected_dhcpmsgtype = -1, dhcp_ok;
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struct in_addr dhcp_serverip;
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#endif
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/* Fetch required bootp infomation */
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void
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bootp(sock, flag)
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int sock;
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int flag;
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{
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struct iodesc *d;
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struct bootp *bp;
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struct {
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u_char header[HEADER_SIZE];
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struct bootp wbootp;
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} wbuf;
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struct {
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u_char header[HEADER_SIZE];
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struct bootp rbootp;
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} rbuf;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootp: socket=%d\n", sock);
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#endif
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if (!bot)
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bot = getsecs();
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if (!(d = socktodesc(sock))) {
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printf("bootp: bad socket. %d\n", sock);
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return;
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}
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootp: d=%lx\n", (long)d);
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#endif
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bp = &wbuf.wbootp;
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bzero(bp, sizeof(*bp));
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bp->bp_op = BOOTREQUEST;
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bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
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bp->bp_hlen = 6;
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bp->bp_xid = htonl(d->xid);
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MACPY(d->myea, bp->bp_chaddr);
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strncpy(bp->bp_file, bootfile, sizeof(bp->bp_file));
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bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
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#ifdef SUPPORT_DHCP
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bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
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bp->bp_vend[5] = 1;
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bp->bp_vend[6] = DHCPDISCOVER;
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/*
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* If we are booting from PXE, we want to send the string
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* 'PXEClient' to the DHCP server so you have the option of
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* only responding to PXE aware dhcp requests.
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*/
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if (flag & BOOTP_PXE) {
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bp->bp_vend[7] = TAG_CLASSID;
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bp->bp_vend[8] = 9;
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bcopy("PXEClient", &bp->bp_vend[9], 9);
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bp->bp_vend[18] = TAG_END;
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} else
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bp->bp_vend[7] = TAG_END;
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#else
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bp->bp_vend[4] = TAG_END;
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#endif
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d->myip.s_addr = INADDR_ANY;
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d->myport = htons(IPPORT_BOOTPC);
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d->destip.s_addr = INADDR_BROADCAST;
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d->destport = htons(IPPORT_BOOTPS);
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#ifdef SUPPORT_DHCP
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expected_dhcpmsgtype = DHCPOFFER;
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dhcp_ok = 0;
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#endif
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if(sendrecv(d,
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bootpsend, bp, sizeof(*bp),
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bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
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== -1) {
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printf("bootp: no reply\n");
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return;
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}
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#ifdef SUPPORT_DHCP
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if(dhcp_ok) {
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u_int32_t leasetime;
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bp->bp_vend[6] = DHCPREQUEST;
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bp->bp_vend[7] = TAG_REQ_ADDR;
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bp->bp_vend[8] = 4;
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bcopy(&rbuf.rbootp.bp_yiaddr, &bp->bp_vend[9], 4);
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bp->bp_vend[13] = TAG_SERVERID;
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bp->bp_vend[14] = 4;
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bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4);
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bp->bp_vend[19] = TAG_LEASETIME;
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bp->bp_vend[20] = 4;
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leasetime = htonl(300);
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bcopy(&leasetime, &bp->bp_vend[21], 4);
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if (flag & BOOTP_PXE) {
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bp->bp_vend[25] = TAG_CLASSID;
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bp->bp_vend[26] = 9;
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bcopy("PXEClient", &bp->bp_vend[27], 9);
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bp->bp_vend[36] = TAG_END;
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} else
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bp->bp_vend[25] = TAG_END;
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expected_dhcpmsgtype = DHCPACK;
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if(sendrecv(d,
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bootpsend, bp, sizeof(*bp),
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bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
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== -1) {
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printf("DHCPREQUEST failed\n");
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return;
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}
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}
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#endif
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myip = d->myip = rbuf.rbootp.bp_yiaddr;
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servip = rbuf.rbootp.bp_siaddr;
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if(rootip.s_addr == INADDR_ANY) rootip = servip;
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bcopy(rbuf.rbootp.bp_file, bootfile, sizeof(bootfile));
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bootfile[sizeof(bootfile) - 1] = '\0';
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if (IN_CLASSA(ntohl(myip.s_addr)))
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nmask = htonl(IN_CLASSA_NET);
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else if (IN_CLASSB(ntohl(myip.s_addr)))
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nmask = htonl(IN_CLASSB_NET);
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else
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nmask = htonl(IN_CLASSC_NET);
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("'native netmask' is %s\n", intoa(nmask));
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#endif
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/* Check subnet mask against net mask; toss if bogus */
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if ((nmask & smask) != nmask) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("subnet mask (%s) bad\n", intoa(smask));
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#endif
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smask = 0;
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}
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/* Get subnet (or natural net) mask */
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netmask = nmask;
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if (smask)
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netmask = smask;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("mask: %s\n", intoa(netmask));
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#endif
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/* We need a gateway if root is on a different net */
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if (!SAMENET(myip, rootip, netmask)) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("need gateway for root ip\n");
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#endif
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}
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/* Toss gateway if on a different net */
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if (!SAMENET(myip, gateip, netmask)) {
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
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#endif
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gateip.s_addr = 0;
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}
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/* Bump xid so next request will be unique. */
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++d->xid;
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}
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/* Transmit a bootp request */
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static ssize_t
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bootpsend(d, pkt, len)
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struct iodesc *d;
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void *pkt;
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size_t len;
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{
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struct bootp *bp;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootpsend: d=%lx called.\n", (long)d);
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#endif
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bp = pkt;
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bp->bp_secs = htons((u_short)(getsecs() - bot));
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootpsend: calling sendudp\n");
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#endif
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return (sendudp(d, pkt, len));
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}
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static ssize_t
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bootprecv(d, pkt, len, tleft)
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struct iodesc *d;
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void *pkt;
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size_t len;
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time_t tleft;
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{
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ssize_t n;
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struct bootp *bp;
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#ifdef BOOTP_DEBUGx
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if (debug)
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printf("bootp_recvoffer: called\n");
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#endif
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n = readudp(d, pkt, len, tleft);
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if (n == -1 || n < sizeof(struct bootp) - BOOTP_VENDSIZE)
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goto bad;
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bp = (struct bootp *)pkt;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootprecv: checked. bp = 0x%lx, n = %d\n",
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(long)bp, (int)n);
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#endif
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if (bp->bp_xid != htonl(d->xid)) {
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#ifdef BOOTP_DEBUG
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if (debug) {
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printf("bootprecv: expected xid 0x%lx, got 0x%x\n",
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d->xid, ntohl(bp->bp_xid));
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}
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#endif
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goto bad;
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}
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("bootprecv: got one!\n");
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#endif
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/* Suck out vendor info */
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if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) {
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if(vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)) != 0)
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goto bad;
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}
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#ifdef BOOTP_VEND_CMU
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else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
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vend_cmu(bp->bp_vend);
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#endif
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else
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printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
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return(n);
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bad:
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errno = 0;
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return (-1);
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}
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static int
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vend_rfc1048(cp, len)
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u_char *cp;
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u_int len;
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{
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u_char *ep;
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int size;
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u_char tag;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("vend_rfc1048 bootp info. len=%d\n", len);
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#endif
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ep = cp + len;
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/* Step over magic cookie */
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cp += sizeof(int);
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while (cp < ep) {
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tag = *cp++;
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size = *cp++;
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if (tag == TAG_END)
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break;
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if (tag == TAG_SUBNET_MASK) {
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bcopy(cp, &smask, sizeof(smask));
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}
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if (tag == TAG_GATEWAY) {
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bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
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}
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if (tag == TAG_SWAPSERVER) {
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/* let it override bp_siaddr */
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bcopy(cp, &rootip.s_addr, sizeof(swapip.s_addr));
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}
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if (tag == TAG_ROOTPATH) {
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strncpy(rootpath, (char *)cp, sizeof(rootpath));
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rootpath[size] = '\0';
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}
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if (tag == TAG_HOSTNAME) {
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strncpy(hostname, (char *)cp, sizeof(hostname));
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hostname[size] = '\0';
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}
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#ifdef SUPPORT_DHCP
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if (tag == TAG_DHCP_MSGTYPE) {
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if(*cp != expected_dhcpmsgtype)
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return(-1);
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dhcp_ok = 1;
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}
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if (tag == TAG_SERVERID) {
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bcopy(cp, &dhcp_serverip.s_addr,
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sizeof(dhcp_serverip.s_addr));
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}
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#endif
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cp += size;
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}
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return(0);
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}
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#ifdef BOOTP_VEND_CMU
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static void
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vend_cmu(cp)
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u_char *cp;
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{
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struct cmu_vend *vp;
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#ifdef BOOTP_DEBUG
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if (debug)
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printf("vend_cmu bootp info.\n");
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#endif
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vp = (struct cmu_vend *)cp;
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if (vp->v_smask.s_addr != 0) {
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smask = vp->v_smask.s_addr;
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}
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if (vp->v_dgate.s_addr != 0) {
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gateip = vp->v_dgate;
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}
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}
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#endif
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