1 /* $NetBSD: bootp.c,v 1.14 1998/02/16 11:10:54 drochner Exp $ */
4 * Copyright (c) 1992 Regents of the University of California.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/types.h>
42 #include <netinet/in.h>
43 #include <netinet/in_systm.h>
56 struct in_addr servip;
58 static n_long nmask, smask;
62 static char vm_rfc1048[4] = VM_RFC1048;
64 static char vm_cmu[4] = VM_CMU;
68 static ssize_t bootpsend(struct iodesc *, void *, size_t);
69 static ssize_t bootprecv(struct iodesc *, void *, size_t, time_t);
70 static int vend_rfc1048(u_char *, u_int);
72 static void vend_cmu(u_char *);
76 static char expected_dhcpmsgtype = -1, dhcp_ok;
77 struct in_addr dhcp_serverip;
80 /* Fetch required bootp infomation */
89 u_char header[HEADER_SIZE];
93 u_char header[HEADER_SIZE];
99 printf("bootp: socket=%d\n", sock);
104 if (!(d = socktodesc(sock))) {
105 printf("bootp: bad socket. %d\n", sock);
110 printf("bootp: d=%lx\n", (long)d);
114 bzero(bp, sizeof(*bp));
116 bp->bp_op = BOOTREQUEST;
117 bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
119 bp->bp_xid = htonl(d->xid);
120 MACPY(d->myea, bp->bp_chaddr);
121 strncpy(bp->bp_file, bootfile, sizeof(bp->bp_file));
122 bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
124 bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
126 bp->bp_vend[6] = DHCPDISCOVER;
129 * If we are booting from PXE, we want to send the string
130 * 'PXEClient' to the DHCP server so you have the option of
131 * only responding to PXE aware dhcp requests.
133 if (flag & BOOTP_PXE) {
134 bp->bp_vend[7] = TAG_CLASSID;
136 bcopy("PXEClient", &bp->bp_vend[9], 9);
137 bp->bp_vend[18] = TAG_END;
139 bp->bp_vend[7] = TAG_END;
141 bp->bp_vend[4] = TAG_END;
144 d->myip.s_addr = INADDR_ANY;
145 d->myport = htons(IPPORT_BOOTPC);
146 d->destip.s_addr = INADDR_BROADCAST;
147 d->destport = htons(IPPORT_BOOTPS);
150 expected_dhcpmsgtype = DHCPOFFER;
155 bootpsend, bp, sizeof(*bp),
156 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
158 printf("bootp: no reply\n");
165 bp->bp_vend[6] = DHCPREQUEST;
166 bp->bp_vend[7] = TAG_REQ_ADDR;
168 bcopy(&rbuf.rbootp.bp_yiaddr, &bp->bp_vend[9], 4);
169 bp->bp_vend[13] = TAG_SERVERID;
171 bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4);
172 bp->bp_vend[19] = TAG_LEASETIME;
174 leasetime = htonl(300);
175 bcopy(&leasetime, &bp->bp_vend[21], 4);
176 if (flag & BOOTP_PXE) {
177 bp->bp_vend[25] = TAG_CLASSID;
179 bcopy("PXEClient", &bp->bp_vend[27], 9);
180 bp->bp_vend[36] = TAG_END;
182 bp->bp_vend[25] = TAG_END;
184 expected_dhcpmsgtype = DHCPACK;
187 bootpsend, bp, sizeof(*bp),
188 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
190 printf("DHCPREQUEST failed\n");
196 myip = d->myip = rbuf.rbootp.bp_yiaddr;
197 servip = rbuf.rbootp.bp_siaddr;
198 if(rootip.s_addr == INADDR_ANY) rootip = servip;
199 bcopy(rbuf.rbootp.bp_file, bootfile, sizeof(bootfile));
200 bootfile[sizeof(bootfile) - 1] = '\0';
202 if (IN_CLASSA(ntohl(myip.s_addr)))
203 nmask = htonl(IN_CLASSA_NET);
204 else if (IN_CLASSB(ntohl(myip.s_addr)))
205 nmask = htonl(IN_CLASSB_NET);
207 nmask = htonl(IN_CLASSC_NET);
210 printf("'native netmask' is %s\n", intoa(nmask));
213 /* Check subnet mask against net mask; toss if bogus */
214 if ((nmask & smask) != nmask) {
217 printf("subnet mask (%s) bad\n", intoa(smask));
222 /* Get subnet (or natural net) mask */
228 printf("mask: %s\n", intoa(netmask));
231 /* We need a gateway if root is on a different net */
232 if (!SAMENET(myip, rootip, netmask)) {
235 printf("need gateway for root ip\n");
239 /* Toss gateway if on a different net */
240 if (!SAMENET(myip, gateip, netmask)) {
243 printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
248 /* Bump xid so next request will be unique. */
252 /* Transmit a bootp request */
254 bootpsend(d, pkt, len)
263 printf("bootpsend: d=%lx called.\n", (long)d);
267 bp->bp_secs = htons((u_short)(getsecs() - bot));
271 printf("bootpsend: calling sendudp\n");
274 return (sendudp(d, pkt, len));
278 bootprecv(d, pkt, len, tleft)
289 printf("bootp_recvoffer: called\n");
292 n = readudp(d, pkt, len, tleft);
293 if (n == -1 || n < sizeof(struct bootp) - BOOTP_VENDSIZE)
296 bp = (struct bootp *)pkt;
300 printf("bootprecv: checked. bp = 0x%lx, n = %d\n",
303 if (bp->bp_xid != htonl(d->xid)) {
306 printf("bootprecv: expected xid 0x%lx, got 0x%x\n",
307 d->xid, ntohl(bp->bp_xid));
315 printf("bootprecv: got one!\n");
318 /* Suck out vendor info */
319 if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) {
320 if(vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)) != 0)
323 #ifdef BOOTP_VEND_CMU
324 else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
325 vend_cmu(bp->bp_vend);
328 printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
337 vend_rfc1048(cp, len)
347 printf("vend_rfc1048 bootp info. len=%d\n", len);
351 /* Step over magic cookie */
360 if (tag == TAG_SUBNET_MASK) {
361 bcopy(cp, &smask, sizeof(smask));
363 if (tag == TAG_GATEWAY) {
364 bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
366 if (tag == TAG_SWAPSERVER) {
367 /* let it override bp_siaddr */
368 bcopy(cp, &rootip.s_addr, sizeof(swapip.s_addr));
370 if (tag == TAG_ROOTPATH) {
371 strncpy(rootpath, (char *)cp, sizeof(rootpath));
372 rootpath[size] = '\0';
374 if (tag == TAG_HOSTNAME) {
375 strncpy(hostname, (char *)cp, sizeof(hostname));
376 hostname[size] = '\0';
379 if (tag == TAG_DHCP_MSGTYPE) {
380 if(*cp != expected_dhcpmsgtype)
384 if (tag == TAG_SERVERID) {
385 bcopy(cp, &dhcp_serverip.s_addr,
386 sizeof(dhcp_serverip.s_addr));
394 #ifdef BOOTP_VEND_CMU
403 printf("vend_cmu bootp info.\n");
405 vp = (struct cmu_vend *)cp;
407 if (vp->v_smask.s_addr != 0) {
408 smask = vp->v_smask.s_addr;
410 if (vp->v_dgate.s_addr != 0) {
411 gateip = vp->v_dgate;