Annotation of sys/lib/libsa/bootp.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: bootp.c,v 1.12 2006/02/06 17:37:28 jmc Exp $ */
2: /* $NetBSD: bootp.c,v 1.10 1996/10/13 02:28:59 christos Exp $ */
3:
4: /*
5: * Copyright (c) 1992 Regents of the University of California.
6: * All rights reserved.
7: *
8: * This software was developed by the Computer Systems Engineering group
9: * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10: * contributed to Berkeley.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. All advertising materials mentioning features or use of this software
21: * must display the following acknowledgement:
22: * This product includes software developed by the University of
23: * California, Lawrence Berkeley Laboratory and its contributors.
24: * 4. Neither the name of the University nor the names of its contributors
25: * may be used to endorse or promote products derived from this software
26: * without specific prior written permission.
27: *
28: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38: * SUCH DAMAGE.
39: *
40: * @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
41: */
42:
43: #include <sys/types.h>
44: #include <sys/socket.h>
45: #include <netinet/in.h>
46: #include <netinet/in_systm.h>
47:
48: #include "stand.h"
49: #include "net.h"
50: #include "netif.h"
51: #include "bootp.h"
52:
53: static n_long nmask, smask;
54:
55: static time_t bot;
56:
57: static char vm_rfc1048[4] = VM_RFC1048;
58: static char vm_cmu[4] = VM_CMU;
59:
60: /* Local forwards */
61: static ssize_t bootpsend(struct iodesc *, void *, size_t);
62: static ssize_t bootprecv(struct iodesc *, void *, size_t, time_t);
63: static void vend_cmu(u_char *);
64: static void vend_rfc1048(u_char *, u_int);
65:
66: /* Fetch required bootp information */
67: void
68: bootp(int sock)
69: {
70: struct iodesc *d;
71: struct bootp *bp;
72: struct {
73: u_char header[HEADER_SIZE];
74: struct bootp wbootp;
75: } wbuf;
76: struct {
77: u_char header[HEADER_SIZE];
78: struct bootp rbootp;
79: } rbuf;
80:
81: #ifdef BOOTP_DEBUG
82: if (debug)
83: printf("bootp: socket=%d\n", sock);
84: #endif
85: if (!bot)
86: bot = getsecs();
87:
88: if (!(d = socktodesc(sock))) {
89: printf("bootp: bad socket. %d\n", sock);
90: return;
91: }
92: #ifdef BOOTP_DEBUG
93: if (debug)
94: printf("bootp: d=%x\n", (u_int)d);
95: #endif
96:
97: bp = &wbuf.wbootp;
98: bzero(bp, sizeof(*bp));
99:
100: bp->bp_op = BOOTREQUEST;
101: bp->bp_htype = HTYPE_ETHERNET; /* 10Mb Ethernet (48 bits) */
102: bp->bp_hlen = 6;
103: bp->bp_xid = htonl(d->xid);
104: MACPY(d->myea, bp->bp_chaddr);
105: bzero(bp->bp_file, sizeof(bp->bp_file));
106: bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
107:
108: d->myip = myip;
109: d->myport = htons(IPPORT_BOOTPC);
110: d->destip.s_addr = INADDR_BROADCAST;
111: d->destport = htons(IPPORT_BOOTPS);
112:
113: (void)sendrecv(d,
114: bootpsend, bp, sizeof(*bp),
115: bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp));
116:
117: /* Bump xid so next request will be unique. */
118: ++d->xid;
119: }
120:
121: /* Transmit a bootp request */
122: static ssize_t
123: bootpsend(struct iodesc *d, void *pkt, size_t len)
124: {
125: struct bootp *bp;
126:
127: #ifdef BOOTP_DEBUG
128: if (debug)
129: printf("bootpsend: d=%x called.\n", (u_int)d);
130: #endif
131:
132: bp = pkt;
133: bp->bp_secs = htons((u_short)(getsecs() - bot));
134:
135: #ifdef BOOTP_DEBUG
136: if (debug)
137: printf("bootpsend: calling sendudp\n");
138: #endif
139:
140: return (sendudp(d, pkt, len));
141: }
142:
143: /* Returns 0 if this is the packet we're waiting for else -1 (and errno == 0) */
144: static ssize_t
145: bootprecv(struct iodesc *d, void *pkt, size_t len, time_t tleft)
146: {
147: ssize_t n;
148: struct bootp *bp;
149:
150: #ifdef BOOTP_DEBUG
151: if (debug)
152: printf("bootprecv: called\n");
153: #endif
154:
155: n = readudp(d, pkt, len, tleft);
156: if (n < 0 || (size_t)n < sizeof(struct bootp))
157: goto bad;
158:
159: bp = (struct bootp *)pkt;
160:
161: #ifdef BOOTP_DEBUG
162: if (debug)
163: printf("bootprecv: checked. bp = 0x%x, n = %d\n",
164: (unsigned)bp, n);
165: #endif
166: if (bp->bp_xid != htonl(d->xid)) {
167: #ifdef BOOTP_DEBUG
168: if (debug) {
169: printf("bootprecv: expected xid 0x%lx, got 0x%lx\n",
170: d->xid, ntohl(bp->bp_xid));
171: }
172: #endif
173: goto bad;
174: }
175:
176: #ifdef BOOTP_DEBUG
177: if (debug)
178: printf("bootprecv: got one!\n");
179: #endif
180:
181: /* Pick up our ip address (and natural netmask) */
182: myip = d->myip = bp->bp_yiaddr;
183: #ifdef BOOTP_DEBUG
184: if (debug)
185: printf("our ip address is %s\n", inet_ntoa(d->myip));
186: #endif
187: if (IN_CLASSA(d->myip.s_addr))
188: nmask = IN_CLASSA_NET;
189: else if (IN_CLASSB(d->myip.s_addr))
190: nmask = IN_CLASSB_NET;
191: else
192: nmask = IN_CLASSC_NET;
193: #ifdef BOOTP_DEBUG
194: if (debug)
195: printf("'native netmask' is %s\n", intoa(nmask));
196: #endif
197:
198: /* Pick up root or swap server address and file spec. */
199: if (bp->bp_siaddr.s_addr != 0)
200: rootip = bp->bp_siaddr;
201: if (bp->bp_file[0] != '\0') {
202: strncpy(bootfile, (char *)bp->bp_file, sizeof(bootfile));
203: bootfile[sizeof(bootfile) - 1] = '\0';
204: }
205:
206: /* Suck out vendor info */
207: if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
208: vend_cmu(bp->bp_vend);
209: else if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0)
210: vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend));
211: else
212: printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
213:
214: /* Check subnet mask against net mask; toss if bogus */
215: if ((nmask & smask) != nmask) {
216: #ifdef BOOTP_DEBUG
217: if (debug)
218: printf("subnet mask (%s) bad\n", intoa(smask));
219: #endif
220: smask = 0;
221: }
222:
223: /* Get subnet (or natural net) mask */
224: netmask = nmask;
225: if (smask)
226: netmask = smask;
227: #ifdef BOOTP_DEBUG
228: if (debug)
229: printf("mask: %s\n", intoa(netmask));
230: #endif
231:
232: /* We need a gateway if root or swap is on a different net */
233: if (!SAMENET(d->myip, rootip, netmask)) {
234: #ifdef BOOTP_DEBUG
235: if (debug)
236: printf("need gateway for root ip\n");
237: #endif
238: }
239:
240: if (!SAMENET(d->myip, swapip, netmask)) {
241: #ifdef BOOTP_DEBUG
242: if (debug)
243: printf("need gateway for swap ip\n");
244: #endif
245: }
246:
247: /* Toss gateway if on a different net */
248: if (!SAMENET(d->myip, gateip, netmask)) {
249: #ifdef BOOTP_DEBUG
250: if (debug)
251: printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
252: #endif
253: gateip.s_addr = 0;
254: }
255:
256: return (n);
257:
258: bad:
259: errno = 0;
260: return (-1);
261: }
262:
263: static void
264: vend_cmu(u_char *cp)
265: {
266: struct cmu_vend *vp;
267:
268: #ifdef BOOTP_DEBUG
269: if (debug)
270: printf("vend_cmu bootp info.\n");
271: #endif
272: vp = (struct cmu_vend *)cp;
273:
274: if (vp->v_smask.s_addr != 0)
275: smask = vp->v_smask.s_addr;
276: if (vp->v_dgate.s_addr != 0)
277: gateip = vp->v_dgate;
278: }
279:
280: static void
281: vend_rfc1048(u_char *cp, u_int len)
282: {
283: u_char *ep;
284: int size;
285: u_char tag;
286:
287: #ifdef BOOTP_DEBUG
288: if (debug)
289: printf("vend_rfc1048 bootp info. len=%d\n", len);
290: #endif
291: ep = cp + len;
292:
293: /* Step over magic cookie */
294: cp += sizeof(int);
295:
296: while (cp < ep) {
297: tag = *cp++;
298: size = *cp++;
299: if (tag == TAG_END)
300: break;
301:
302: if (tag == TAG_SUBNET_MASK)
303: bcopy(cp, &smask, sizeof(smask));
304: if (tag == TAG_GATEWAY)
305: bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
306: if (tag == TAG_SWAPSERVER)
307: bcopy(cp, &swapip.s_addr, sizeof(swapip.s_addr));
308: if (tag == TAG_DOMAIN_SERVER)
309: bcopy(cp, &nameip.s_addr, sizeof(nameip.s_addr));
310: if (tag == TAG_ROOTPATH) {
311: strncpy(rootpath, (char *)cp, sizeof(rootpath));
312: rootpath[size] = '\0';
313: }
314: if (tag == TAG_HOSTNAME) {
315: strncpy(hostname, (char *)cp, sizeof(hostname));
316: hostname[size] = '\0';
317: }
318: if (tag == TAG_DOMAINNAME) {
319: strncpy(domainname, (char *)cp, sizeof(domainname));
320: domainname[size] = '\0';
321: }
322: cp += size;
323: }
324: }
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