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 * 3. 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)
36 * $FreeBSD: src/lib/libstand/bootp.c,v 1.1.1.1.6.2 2000/09/20 18:37:25 ps Exp $
37 * $DragonFly: src/lib/libstand/bootp.c,v 1.5 2005/12/11 02:27:26 swildner Exp $
40 #include <sys/param.h>
41 #include <netinet/in.h>
42 #include <netinet/in_systm.h>
55 struct in_addr servip;
57 static n_long nmask, smask;
61 static char vm_rfc1048[4] = VM_RFC1048;
63 static char vm_cmu[4] = VM_CMU;
67 static ssize_t bootpsend(struct iodesc *, void *, size_t);
68 static ssize_t bootprecv(struct iodesc *, void *, size_t, time_t);
69 static int vend_rfc1048(u_char *, u_int);
71 static void vend_cmu(u_char *);
75 static char expected_dhcpmsgtype = -1, dhcp_ok;
76 struct in_addr dhcp_serverip;
79 /* Fetch required bootp infomation */
81 bootp(int sock, int flag)
86 u_char header[HEADER_SIZE];
90 u_char header[HEADER_SIZE];
96 printf("bootp: socket=%d\n", sock);
101 if (!(d = socktodesc(sock))) {
102 printf("bootp: bad socket. %d\n", sock);
107 printf("bootp: d=%lx\n", (long)d);
111 bzero(bp, sizeof(*bp));
113 bp->bp_op = BOOTREQUEST;
114 bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
116 bp->bp_xid = htonl(d->xid);
117 MACPY(d->myea, bp->bp_chaddr);
118 strncpy(bp->bp_file, bootfile, sizeof(bp->bp_file));
119 bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
121 bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
123 bp->bp_vend[6] = DHCPDISCOVER;
126 * If we are booting from PXE, we want to send the string
127 * 'PXEClient' to the DHCP server so you have the option of
128 * only responding to PXE aware dhcp requests.
130 if (flag & BOOTP_PXE) {
131 bp->bp_vend[7] = TAG_CLASSID;
133 bcopy("PXEClient", &bp->bp_vend[9], 9);
134 bp->bp_vend[18] = TAG_END;
136 bp->bp_vend[7] = TAG_END;
138 bp->bp_vend[4] = TAG_END;
141 d->myip.s_addr = INADDR_ANY;
142 d->myport = htons(IPPORT_BOOTPC);
143 d->destip.s_addr = INADDR_BROADCAST;
144 d->destport = htons(IPPORT_BOOTPS);
147 expected_dhcpmsgtype = DHCPOFFER;
152 bootpsend, bp, sizeof(*bp),
153 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
155 printf("bootp: no reply\n");
162 bp->bp_vend[6] = DHCPREQUEST;
163 bp->bp_vend[7] = TAG_REQ_ADDR;
165 bcopy(&rbuf.rbootp.bp_yiaddr, &bp->bp_vend[9], 4);
166 bp->bp_vend[13] = TAG_SERVERID;
168 bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4);
169 bp->bp_vend[19] = TAG_LEASETIME;
171 leasetime = htonl(300);
172 bcopy(&leasetime, &bp->bp_vend[21], 4);
173 if (flag & BOOTP_PXE) {
174 bp->bp_vend[25] = TAG_CLASSID;
176 bcopy("PXEClient", &bp->bp_vend[27], 9);
177 bp->bp_vend[36] = TAG_END;
179 bp->bp_vend[25] = TAG_END;
181 expected_dhcpmsgtype = DHCPACK;
184 bootpsend, bp, sizeof(*bp),
185 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
187 printf("DHCPREQUEST failed\n");
193 myip = d->myip = rbuf.rbootp.bp_yiaddr;
194 servip = rbuf.rbootp.bp_siaddr;
195 if(rootip.s_addr == INADDR_ANY) rootip = servip;
196 bcopy(rbuf.rbootp.bp_file, bootfile, sizeof(bootfile));
197 bootfile[sizeof(bootfile) - 1] = '\0';
199 if (IN_CLASSA(ntohl(myip.s_addr)))
200 nmask = htonl(IN_CLASSA_NET);
201 else if (IN_CLASSB(ntohl(myip.s_addr)))
202 nmask = htonl(IN_CLASSB_NET);
204 nmask = htonl(IN_CLASSC_NET);
207 printf("'native netmask' is %s\n", intoa(nmask));
210 /* Check subnet mask against net mask; toss if bogus */
211 if ((nmask & smask) != nmask) {
214 printf("subnet mask (%s) bad\n", intoa(smask));
219 /* Get subnet (or natural net) mask */
225 printf("mask: %s\n", intoa(netmask));
228 /* We need a gateway if root is on a different net */
229 if (!SAMENET(myip, rootip, netmask)) {
232 printf("need gateway for root ip\n");
236 /* Toss gateway if on a different net */
237 if (!SAMENET(myip, gateip, netmask)) {
240 printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
245 /* Bump xid so next request will be unique. */
249 /* Transmit a bootp request */
251 bootpsend(struct iodesc *d, void *pkt, size_t len)
257 printf("bootpsend: d=%lx called.\n", (long)d);
261 bp->bp_secs = htons((u_short)(getsecs() - bot));
265 printf("bootpsend: calling sendudp\n");
268 return (sendudp(d, pkt, len));
272 bootprecv(struct iodesc *d, void *pkt, size_t len, time_t tleft)
279 printf("bootp_recvoffer: called\n");
282 n = readudp(d, pkt, len, tleft);
283 if (n == -1 || n < sizeof(struct bootp) - BOOTP_VENDSIZE)
286 bp = (struct bootp *)pkt;
290 printf("bootprecv: checked. bp = 0x%lx, n = %d\n",
293 if (bp->bp_xid != htonl(d->xid)) {
296 printf("bootprecv: expected xid 0x%lx, got 0x%x\n",
297 d->xid, ntohl(bp->bp_xid));
305 printf("bootprecv: got one!\n");
308 /* Suck out vendor info */
309 if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) {
310 if(vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)) != 0)
313 #ifdef BOOTP_VEND_CMU
314 else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
315 vend_cmu(bp->bp_vend);
318 printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
327 vend_rfc1048(u_char *cp, u_int len)
335 printf("vend_rfc1048 bootp info. len=%d\n", len);
339 /* Step over magic cookie */
348 if (tag == TAG_SUBNET_MASK) {
349 bcopy(cp, &smask, sizeof(smask));
351 if (tag == TAG_GATEWAY) {
352 bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
354 if (tag == TAG_SWAPSERVER) {
355 /* let it override bp_siaddr */
356 bcopy(cp, &rootip.s_addr, sizeof(swapip.s_addr));
358 if (tag == TAG_ROOTPATH) {
359 strncpy(rootpath, (char *)cp, sizeof(rootpath));
360 rootpath[size] = '\0';
362 if (tag == TAG_HOSTNAME) {
363 strncpy(hostname, (char *)cp, sizeof(hostname));
364 hostname[size] = '\0';
367 if (tag == TAG_DHCP_MSGTYPE) {
368 if(*cp != expected_dhcpmsgtype)
372 if (tag == TAG_SERVERID) {
373 bcopy(cp, &dhcp_serverip.s_addr,
374 sizeof(dhcp_serverip.s_addr));
382 #ifdef BOOTP_VEND_CMU
390 printf("vend_cmu bootp info.\n");
392 vp = (struct cmu_vend *)cp;
394 if (vp->v_smask.s_addr != 0) {
395 smask = vp->v_smask.s_addr;
397 if (vp->v_dgate.s_addr != 0) {
398 gateip = vp->v_dgate;