743 lines
18 KiB
C
743 lines
18 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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#define DHCP_ENV_NOVENDOR 1 /* do not parse vendor options */
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#define DHCP_ENV_PXE 10 /* assume pxe vendor options */
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#define DHCP_ENV_FREEBSD 11 /* assume freebsd vendor options
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/* set DHCP_ENV to one of the values above to export dhcp options to kenv */
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#define DHCP_ENV DHCP_ENV_NO_VENDOR
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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 DHCP_ENV /* export the dhcp response to kenv */
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struct dhcp_opt;
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static void setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts);
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#else
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#define setenv_(a, b, c)
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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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setenv_(cp, ep, NULL);
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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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#ifdef DHCP_ENV
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/*
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* Parse DHCP options and store them into kenv variables.
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* Original code from Danny Braniss, modifications by Luigi Rizzo.
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*
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* The parser is driven by tables which specify the type and name of
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* each dhcp option and how it appears in kenv.
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* The first entry in the list contains the prefix used to set the kenv
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* name (including the . if needed), the last entry must have a 0 tag.
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* Entries do not need to be sorted though it helps for readability.
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*
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* Certain vendor-specific tables can be enabled according to DHCP_ENV.
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* Set it to 0 if you don't want any.
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*/
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enum opt_fmt { __NONE = 0,
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__8 = 1, __16 = 2, __32 = 4, /* Unsigned fields, value=size */
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__IP, /* IPv4 address */
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__TXT, /* C string */
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__BYTES, /* byte sequence, printed %02x */
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__INDIR, /* name=value */
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__ILIST, /* name=value;name=value ... */
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__VE, /* vendor specific, recurse */
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};
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struct dhcp_opt {
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uint8_t tag;
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uint8_t fmt;
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const char *desc;
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};
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static struct dhcp_opt vndr_opt[] = { /* Vendor Specific Options */
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#if DHCP_ENV == DHCP_ENV_FREEBSD /* FreeBSD table in the original code */
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{0, 0, "FreeBSD"}, /* prefix */
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{1, __TXT, "kernel"},
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{2, __TXT, "kernelname"},
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{3, __TXT, "kernel_options"},
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{4, __IP, "usr-ip"},
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{5, __TXT, "conf-path"},
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{6, __TXT, "rc.conf0"},
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{7, __TXT, "rc.conf1"},
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{8, __TXT, "rc.conf2"},
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{9, __TXT, "rc.conf3"},
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{10, __TXT, "rc.conf4"},
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{11, __TXT, "rc.conf5"},
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{12, __TXT, "rc.conf6"},
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{13, __TXT, "rc.conf7"},
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{14, __TXT, "rc.conf8"},
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{15, __TXT, "rc.conf9"},
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{20, __TXT, "boot.nfsroot.options"},
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{245, __INDIR, ""},
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{246, __INDIR, ""},
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{247, __INDIR, ""},
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{248, __INDIR, ""},
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{249, __INDIR, ""},
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{250, __INDIR, ""},
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{251, __INDIR, ""},
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{252, __INDIR, ""},
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{253, __INDIR, ""},
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{254, __INDIR, ""},
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#elif DHCP_ENV == DHCP_ENV_PXE /* some pxe options, RFC4578 */
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{0, 0, "pxe"}, /* prefix */
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{93, __16, "system-architecture"},
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{94, __BYTES, "network-interface"},
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{97, __BYTES, "machine-identifier"},
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#else /* default (empty) table */
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{0, 0, "dhcp.vendor."}, /* prefix */
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#endif
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{0, __TXT, "%soption-%d"}
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};
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|
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static struct dhcp_opt dhcp_opt[] = {
|
|
/* DHCP Option names, formats and codes, from RFC2132. */
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{0, 0, "dhcp."}, // prefix
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{1, __IP, "subnet-mask"},
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{2, __32, "time-offset"}, /* this is signed */
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{3, __IP, "routers"},
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{4, __IP, "time-servers"},
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{5, __IP, "ien116-name-servers"},
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{6, __IP, "domain-name-servers"},
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{7, __IP, "log-servers"},
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{8, __IP, "cookie-servers"},
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{9, __IP, "lpr-servers"},
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{10, __IP, "impress-servers"},
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{11, __IP, "resource-location-servers"},
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{12, __TXT, "host-name"},
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{13, __16, "boot-size"},
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{14, __TXT, "merit-dump"},
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{15, __TXT, "domain-name"},
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{16, __IP, "swap-server"},
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{17, __TXT, "root-path"},
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{18, __TXT, "extensions-path"},
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{19, __8, "ip-forwarding"},
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{20, __8, "non-local-source-routing"},
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{21, __IP, "policy-filter"},
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{22, __16, "max-dgram-reassembly"},
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{23, __8, "default-ip-ttl"},
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{24, __32, "path-mtu-aging-timeout"},
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{25, __16, "path-mtu-plateau-table"},
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{26, __16, "interface-mtu"},
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{27, __8, "all-subnets-local"},
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{28, __IP, "broadcast-address"},
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{29, __8, "perform-mask-discovery"},
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{30, __8, "mask-supplier"},
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{31, __8, "perform-router-discovery"},
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{32, __IP, "router-solicitation-address"},
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{33, __IP, "static-routes"},
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{34, __8, "trailer-encapsulation"},
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{35, __32, "arp-cache-timeout"},
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{36, __8, "ieee802-3-encapsulation"},
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{37, __8, "default-tcp-ttl"},
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{38, __32, "tcp-keepalive-interval"},
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{39, __8, "tcp-keepalive-garbage"},
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{40, __TXT, "nis-domain"},
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{41, __IP, "nis-servers"},
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{42, __IP, "ntp-servers"},
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{43, __VE, "vendor-encapsulated-options"},
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{44, __IP, "netbios-name-servers"},
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{45, __IP, "netbios-dd-server"},
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{46, __8, "netbios-node-type"},
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{47, __TXT, "netbios-scope"},
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{48, __IP, "x-font-servers"},
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{49, __IP, "x-display-managers"},
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{50, __IP, "dhcp-requested-address"},
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{51, __32, "dhcp-lease-time"},
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{52, __8, "dhcp-option-overload"},
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{53, __8, "dhcp-message-type"},
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{54, __IP, "dhcp-server-identifier"},
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{55, __8, "dhcp-parameter-request-list"},
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{56, __TXT, "dhcp-message"},
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{57, __16, "dhcp-max-message-size"},
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{58, __32, "dhcp-renewal-time"},
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{59, __32, "dhcp-rebinding-time"},
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{60, __TXT, "vendor-class-identifier"},
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{61, __TXT, "dhcp-client-identifier"},
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{64, __TXT, "nisplus-domain"},
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{65, __IP, "nisplus-servers"},
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{66, __TXT, "tftp-server-name"},
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{67, __TXT, "bootfile-name"},
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{68, __IP, "mobile-ip-home-agent"},
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{69, __IP, "smtp-server"},
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{70, __IP, "pop-server"},
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{71, __IP, "nntp-server"},
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{72, __IP, "www-server"},
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{73, __IP, "finger-server"},
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{74, __IP, "irc-server"},
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{75, __IP, "streettalk-server"},
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{76, __IP, "streettalk-directory-assistance-server"},
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{77, __TXT, "user-class"},
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{85, __IP, "nds-servers"},
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{86, __TXT, "nds-tree-name"},
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{87, __TXT, "nds-context"},
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{210, __TXT, "authenticate"},
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/* use the following entries for arbitrary variables */
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{246, __ILIST, ""},
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{247, __ILIST, ""},
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{248, __ILIST, ""},
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{249, __ILIST, ""},
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{250, __INDIR, ""},
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{251, __INDIR, ""},
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{252, __INDIR, ""},
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{253, __INDIR, ""},
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{254, __INDIR, ""},
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{0, __TXT, "%soption-%d"}
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};
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/*
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* parse a dhcp response, set environment variables translating options
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* names and values according to the tables above. Also set dhcp.tags
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* to the list of selected tags.
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*/
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static void
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setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts)
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{
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u_char *ncp;
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u_char tag;
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char tags[512], *tp; /* the list of tags */
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#define FLD_SEP ',' /* separator in list of elements */
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ncp = cp;
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tp = tags;
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if (opts == NULL)
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opts = dhcp_opt;
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while (ncp < ep) {
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unsigned int size; /* option size */
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char *vp, *endv, buf[256]; /* the value buffer */
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struct dhcp_opt *op;
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tag = *ncp++; /* extract tag and size */
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size = *ncp++;
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cp = ncp; /* current payload */
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ncp += size; /* point to the next option */
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if (tag == TAG_END)
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break;
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if (tag == 0)
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continue;
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for (op = opts+1; op->tag && op->tag != tag; op++)
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;
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/* if not found we end up on the default entry */
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/*
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* Copy data into the buffer. libstand does not have snprintf so we
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* need to be careful with sprintf(). With strings, the source is
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* always <256 char so shorter than the buffer so we are safe; with
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* other arguments, the longest string is inet_ntoa which is 16 bytes
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* so we make sure to have always enough room in the string before
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* trying an sprint.
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*/
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vp = buf;
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*vp = '\0';
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endv = buf + sizeof(buf) - 1 - 16; /* last valid write position */
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switch(op->fmt) {
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case __NONE:
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break; /* should not happen */
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case __VE: /* recurse, vendor specific */
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setenv_(cp, cp+size, vndr_opt);
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break;
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case __IP: /* ip address */
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for (; size > 0 && vp < endv; size -= 4, cp += 4) {
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struct in_addr in_ip; /* ip addresses */
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if (vp != buf)
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*vp++ = FLD_SEP;
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bcopy(cp, &in_ip.s_addr, sizeof(in_ip.s_addr));
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sprintf(vp, "%s", inet_ntoa(in_ip));
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vp += strlen(vp);
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}
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break;
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case __BYTES: /* opaque byte string */
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for (; size > 0 && vp < endv; size -= 1, cp += 1) {
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sprintf(vp, "%02x", *cp);
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vp += strlen(vp);
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}
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break;
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case __TXT:
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bcopy(cp, buf, size); /* cannot overflow */
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buf[size] = 0;
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break;
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case __32:
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case __16:
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case __8: /* op->fmt is also the length of each field */
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for (; size > 0 && vp < endv; size -= op->fmt, cp += op->fmt) {
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uint32_t v;
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if (op->fmt == __32)
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v = (cp[0]<<24) + (cp[1]<<16) + (cp[2]<<8) + cp[3];
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else if (op->fmt == __16)
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v = (cp[0]<<8) + cp[1];
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else
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v = cp[0];
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if (vp != buf)
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*vp++ = FLD_SEP;
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sprintf(vp, "%u", v);
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vp += strlen(vp);
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}
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break;
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case __INDIR: /* name=value */
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case __ILIST: /* name=value;name=value... */
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bcopy(cp, buf, size); /* cannot overflow */
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buf[size] = '\0';
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for (endv = buf; endv; endv = vp) {
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u_char *s = NULL; /* semicolon ? */
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/* skip leading whitespace */
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while (*endv && index(" \t\n\r", *endv))
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endv++;
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vp = index(endv, '='); /* find name=value separator */
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if (!vp)
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break;
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*vp++ = 0;
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if (op->fmt == __ILIST && (s = index(vp, ';')))
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*s++ = '\0';
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setenv(endv, vp, 1);
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vp = s; /* prepare for next round */
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}
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buf[0] = '\0'; /* option already done */
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}
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if (tp - tags < sizeof(tags) - 5) { /* add tag to the list */
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if (tp != tags)
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*tp++ = FLD_SEP;
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sprintf(tp, "%d", tag);
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tp += strlen(tp);
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}
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if (buf[0]) {
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char env[128]; /* the string name */
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if (op->tag == 0)
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sprintf(env, op->desc, opts[0].desc, tag);
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else
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sprintf(env, "%s%s", opts[0].desc, op->desc);
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setenv(env, buf, 1);
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}
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}
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if (tp != tags) {
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char env[128]; /* the string name */
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sprintf(env, "%stags", opts[0].desc);
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setenv(env, tags, 1);
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}
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}
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#endif /* additional dhcp */
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