print-bootp.c revision 1.19 
1/*	$OpenBSD: print-bootp.c,v 1.19 2015/01/16 06:40:21 deraadt Exp $	*/
2
3/*
4 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that: (1) source code distributions
9 * retain the above copyright notice and this paragraph in its entirety, (2)
10 * distributions including binary code include the above copyright notice and
11 * this paragraph in its entirety in the documentation or other materials
12 * provided with the distribution, and (3) all advertising materials mentioning
13 * features or use of this software display the following acknowledgement:
14 * ``This product includes software developed by the University of California,
15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16 * the University nor the names of its contributors may be used to endorse
17 * or promote products derived from this software without specific prior
18 * written permission.
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 *
23 * Format and print bootp packets.
24 */
25#include <sys/time.h>
26#include <sys/socket.h>
27
28struct mbuf;
29struct rtentry;
30#include <net/if.h>
31
32#include <netinet/in.h>
33#include <netinet/if_ether.h>
34
35#include <ctype.h>
36#include <memory.h>
37#include <stdio.h>
38#include <string.h>
39
40#include "interface.h"
41#include "addrtoname.h"
42#include "bootp.h"
43
44static void rfc1048_print(const u_char *, u_int);
45static void cmu_print(const u_char *, u_int);
46
47static char tstr[] = " [|bootp]";
48
49/*
50 * Print bootp requests
51 */
52void
53bootp_print(register const u_char *cp, u_int length,
54	    u_short sport, u_short dport)
55{
56	register const struct bootp *bp;
57	static u_char vm_cmu[4] = VM_CMU;
58	static u_char vm_rfc1048[4] = VM_RFC1048;
59
60	bp = (struct bootp *)cp;
61	TCHECK(bp->bp_op);
62	switch (bp->bp_op) {
63
64	case BOOTREQUEST:
65		/* Usually, a request goes from a client to a server */
66		if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
67			printf(" (request)");
68		break;
69
70	case BOOTREPLY:
71		/* Usually, a reply goes from a server to a client */
72		if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
73			printf(" (reply)");
74		break;
75
76	default:
77		printf(" bootp-#%d", bp->bp_op);
78	}
79
80	TCHECK(bp->bp_flags);
81
82	/* The usual hardware address type is 1 (10Mb Ethernet) */
83	if (bp->bp_htype != 1)
84		printf(" htype-#%d", bp->bp_htype);
85
86	/* The usual length for 10Mb Ethernet address is 6 bytes */
87	if (bp->bp_htype != 1 || bp->bp_hlen != 6)
88		printf(" hlen:%d", bp->bp_hlen);
89
90	/* Only print interesting fields */
91	if (bp->bp_hops)
92		printf(" hops:%d", bp->bp_hops);
93	if (bp->bp_xid)
94		printf(" xid:0x%x", (u_int32_t)ntohl(bp->bp_xid));
95	if (bp->bp_secs)
96		printf(" secs:%d", ntohs(bp->bp_secs));
97	if (bp->bp_flags)
98		printf(" flags:0x%x", ntohs(bp->bp_flags));
99
100	/* Client's ip address */
101	TCHECK(bp->bp_ciaddr);
102	if (bp->bp_ciaddr.s_addr)
103		printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
104
105	/* 'your' ip address (bootp client) */
106	TCHECK(bp->bp_yiaddr);
107	if (bp->bp_yiaddr.s_addr)
108		printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
109
110	/* Server's ip address */
111	TCHECK(bp->bp_siaddr);
112	if (bp->bp_siaddr.s_addr)
113		printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
114
115	/* Gateway's ip address */
116	TCHECK(bp->bp_giaddr);
117	if (bp->bp_giaddr.s_addr)
118		printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
119
120	/* Client's Ethernet address */
121	if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
122		register const struct ether_header *eh;
123		register const char *e;
124
125		TCHECK2(bp->bp_chaddr[0], 6);
126		eh = (struct ether_header *)packetp;
127		if (bp->bp_op == BOOTREQUEST)
128			e = (const char *)ESRC(eh);
129		else if (bp->bp_op == BOOTREPLY)
130			e = (const char *)EDST(eh);
131		else
132			e = 0;
133		if (e == 0 || memcmp((char *)bp->bp_chaddr, e, 6) != 0)
134			printf(" ether %s", etheraddr_string(bp->bp_chaddr));
135	}
136
137	TCHECK2(bp->bp_sname[0], 1);		/* check first char only */
138	if (*bp->bp_sname) {
139		printf(" sname \"");
140		if (fn_print(bp->bp_sname, snapend)) {
141			putchar('"');
142			fputs(tstr + 1, stdout);
143			return;
144		}
145		putchar('"');
146	}
147	TCHECK2(bp->bp_file[0], 1);		/* check first char only */
148	if (*bp->bp_file) {
149		printf(" file \"");
150		if (fn_print(bp->bp_file, snapend)) {
151			putchar('"');
152			fputs(tstr + 1, stdout);
153			return;
154		}
155		putchar('"');
156	}
157
158	/* Decode the vendor buffer */
159	TCHECK2(bp->bp_vend[0], sizeof(u_int32_t));
160	length -= sizeof(*bp) - sizeof(bp->bp_vend);
161	if (memcmp((char *)bp->bp_vend, (char *)vm_rfc1048,
162		 sizeof(u_int32_t)) == 0)
163		rfc1048_print(bp->bp_vend, length);
164	else if (memcmp((char *)bp->bp_vend, (char *)vm_cmu,
165		      sizeof(u_int32_t)) == 0)
166		cmu_print(bp->bp_vend, length);
167	else {
168		u_int32_t ul;
169
170		memcpy((char *)&ul, (char *)bp->bp_vend, sizeof(ul));
171		if (ul != 0)
172			printf("vend-#0x%x", ul);
173	}
174
175	return;
176trunc:
177	fputs(tstr, stdout);
178}
179
180/* The first character specifies the format to print */
181static struct tok tag2str[] = {
182/* RFC1048 tags */
183	{ TAG_PAD,		" PAD" },
184	{ TAG_SUBNET_MASK,	"iSM" },	/* subnet mask (RFC950) */
185	{ TAG_TIME_OFFSET,	"lTZ" },	/* seconds from UTC */
186	{ TAG_GATEWAY,		"iDG" },	/* default gateway */
187	{ TAG_TIME_SERVER,	"iTS" },	/* time servers (RFC868) */
188	{ TAG_NAME_SERVER,	"iIEN" },	/* IEN name servers (IEN116) */
189	{ TAG_DOMAIN_SERVER,	"iNS" },	/* domain name (RFC1035) */
190	{ TAG_LOG_SERVER,	"iLOG" },	/* MIT log servers */
191	{ TAG_COOKIE_SERVER,	"iCS" },	/* cookie servers (RFC865) */
192	{ TAG_LPR_SERVER,	"iLPR" },	/* lpr server (RFC1179) */
193	{ TAG_IMPRESS_SERVER,	"iIM" },	/* impress servers (Imagen) */
194	{ TAG_RLP_SERVER,	"iRL" },	/* resource location (RFC887) */
195	{ TAG_HOSTNAME,		"aHN" },	/* ascii hostname */
196	{ TAG_BOOTSIZE,		"sBS" },	/* 512 byte blocks */
197	{ TAG_END,		" END" },
198/* RFC1497 tags */
199	{ TAG_DUMPPATH,		"aDP" },
200	{ TAG_DOMAINNAME,	"aDN" },
201	{ TAG_SWAP_SERVER,	"iSS" },
202	{ TAG_ROOTPATH,		"aRP" },
203	{ TAG_EXTPATH,		"aEP" },
204/* RFC2132 tags */
205	{ TAG_IP_FORWARD,	"BIPF" },
206	{ TAG_NL_SRCRT,		"BSRT" },
207	{ TAG_PFILTERS,		"pPF" },
208	{ TAG_REASS_SIZE,	"sRSZ" },
209	{ TAG_DEF_TTL,		"bTTL" },
210	{ TAG_MTU_TIMEOUT,	"lMA" },
211	{ TAG_MTU_TABLE,	"sMT" },
212	{ TAG_INT_MTU,		"sMTU" },
213	{ TAG_LOCAL_SUBNETS,	"BLSN" },
214	{ TAG_BROAD_ADDR,	"iBR" },
215	{ TAG_DO_MASK_DISC,	"BMD" },
216	{ TAG_SUPPLY_MASK,	"BMS" },
217	{ TAG_DO_RDISC,		"BRD" },
218	{ TAG_RTR_SOL_ADDR,	"iRSA" },
219	{ TAG_STATIC_ROUTE,	"pSR" },
220	{ TAG_USE_TRAILERS,	"BUT" },
221	{ TAG_ARP_TIMEOUT,	"lAT" },
222	{ TAG_ETH_ENCAP,	"BIE" },
223	{ TAG_TCP_TTL,		"bTT" },
224	{ TAG_TCP_KEEPALIVE,	"lKI" },
225	{ TAG_KEEPALIVE_GO,	"BKG" },
226	{ TAG_NIS_DOMAIN,	"aYD" },
227	{ TAG_NIS_SERVERS,	"iYS" },
228	{ TAG_NTP_SERVERS,	"iNTP" },
229	{ TAG_VENDOR_OPTS,	"bVO" },
230	{ TAG_NETBIOS_NS,	"iWNS" },
231	{ TAG_NETBIOS_DDS,	"iWDD" },
232	{ TAG_NETBIOS_NODE,	"bWNT" },
233	{ TAG_NETBIOS_SCOPE,	"aWSC" },
234	{ TAG_XWIN_FS,		"iXFS" },
235	{ TAG_XWIN_DM,		"iXDM" },
236	{ TAG_NIS_P_DOMAIN,	"sN+D" },
237	{ TAG_NIS_P_SERVERS,	"iN+S" },
238	{ TAG_MOBILE_HOME,	"iMH" },
239	{ TAG_SMPT_SERVER,	"iSMTP" },
240	{ TAG_POP3_SERVER,	"iPOP3" },
241	{ TAG_NNTP_SERVER,	"iNNTP" },
242	{ TAG_WWW_SERVER,	"iWWW" },
243	{ TAG_FINGER_SERVER,	"iFG" },
244	{ TAG_IRC_SERVER,	"iIRC" },
245	{ TAG_STREETTALK_SRVR,	"iSTS" },
246	{ TAG_STREETTALK_STDA,	"iSTDA" },
247	{ TAG_REQUESTED_IP,	"iRQ" },
248	{ TAG_IP_LEASE,		"lLT" },
249	{ TAG_OPT_OVERLOAD,	"bOO" },
250	{ TAG_TFTP_SERVER,	"aTFTP" },
251	{ TAG_BOOTFILENAME,	"aBF" },
252	{ TAG_DHCP_MESSAGE,	" DHCP" },
253	{ TAG_SERVER_ID,	"iSID" },
254	{ TAG_PARM_REQUEST,	"bPR" },
255	{ TAG_MESSAGE,		"aMSG" },
256	{ TAG_MAX_MSG_SIZE,	"sMSZ" },
257	{ TAG_RENEWAL_TIME,	"lRN" },
258	{ TAG_REBIND_TIME,	"lRB" },
259	{ TAG_VENDOR_CLASS,	"bVC" },
260	{ TAG_CLIENT_ID,	"bCID" },
261	{ 0,			NULL }
262};
263
264static void
265rfc1048_print(register const u_char *bp, register u_int length)
266{
267	register u_char tag;
268	register u_int len, size;
269	register const char *cp;
270	register u_char c;
271	int first;
272	u_int32_t ul;
273	u_short us;
274
275	printf(" vend-rfc1048");
276
277	/* Step over magic cookie */
278	bp += sizeof(int32_t);
279
280	/* Loop while we there is a tag left in the buffer */
281	while (bp + 1 < snapend) {
282		tag = *bp++;
283		if (tag == TAG_PAD)
284			continue;
285		if (tag == TAG_END)
286			return;
287		cp = tok2str(tag2str, "?T%d", tag);
288		c = *cp++;
289		printf(" %s:", cp);
290
291		/* Get the length; check for truncation */
292		if (bp + 1 >= snapend) {
293			fputs(tstr, stdout);
294			return;
295		}
296		len = *bp++;
297		if (bp + len >= snapend) {
298			fputs(tstr, stdout);
299			return;
300		}
301
302		if (tag == TAG_DHCP_MESSAGE && len == 1) {
303			c = *bp++;
304			switch (c) {
305			case DHCPDISCOVER:	printf("DISCOVER");	break;
306			case DHCPOFFER:		printf("OFFER");	break;
307			case DHCPREQUEST:	printf("REQUEST");	break;
308			case DHCPDECLINE:	printf("DECLINE");	break;
309			case DHCPACK:		printf("ACK");		break;
310			case DHCPNAK:		printf("NACK");		break;
311			case DHCPRELEASE:	printf("RELEASE");	break;
312			case DHCPINFORM:	printf("INFORM");	break;
313			default:		printf("%u", c);	break;
314			}
315			continue;
316		}
317
318		if (tag == TAG_PARM_REQUEST) {
319			first = 1;
320			while (len-- > 0) {
321				c = *bp++;
322				cp = tok2str(tag2str, "?%d", c);
323				if (!first)
324					putchar('+');
325				printf("%s", cp + 1);
326				first = 0;
327			}
328			continue;
329		}
330
331		/* Print data */
332		size = len;
333		if (c == '?') {
334			/* Base default formats for unknown tags on data size */
335			if (size & 1)
336				c = 'b';
337			else if (size & 2)
338				c = 's';
339			else
340				c = 'l';
341		}
342		first = 1;
343		switch (c) {
344
345		case 'a':
346			/* ascii strings */
347			putchar('"');
348			(void)fn_printn(bp, size, NULL);
349			putchar('"');
350			bp += size;
351			size = 0;
352			break;
353
354		case 'i':
355		case 'l':
356			/* ip addresses/32-bit words */
357			while (size >= sizeof(ul)) {
358				if (!first)
359					putchar(',');
360				memcpy((char *)&ul, (char *)bp, sizeof(ul));
361				if (c == 'i')
362					printf("%s", ipaddr_string(&ul));
363				else
364					printf("%u", ntohl(ul));
365				bp += sizeof(ul);
366				size -= sizeof(ul);
367				first = 0;
368			}
369			break;
370
371		case 'p':
372			/* IP address pairs */
373			while (size >= 2*sizeof(ul)) {
374				if (!first)
375					putchar(',');
376				memcpy((char *)&ul, (char *)bp, sizeof(ul));
377				printf("(%s:", ipaddr_string(&ul));
378				bp += sizeof(ul);
379				memcpy((char *)&ul, (char *)bp, sizeof(ul));
380				printf("%s)", ipaddr_string(&ul));
381				bp += sizeof(ul);
382				size -= 2*sizeof(ul);
383				first = 0;
384			}
385			break;
386
387		case 's':
388			/* shorts */
389			while (size >= sizeof(us)) {
390				if (!first)
391					putchar(',');
392				memcpy((char *)&us, (char *)bp, sizeof(us));
393				printf("%u", ntohs(us));
394				bp += sizeof(us);
395				size -= sizeof(us);
396				first = 0;
397			}
398			break;
399
400		case 'B':
401			/* boolean */
402			while (size > 0) {
403				if (!first)
404					putchar(',');
405				switch (*bp) {
406				case 0:
407					putchar('N');
408					break;
409				case 1:
410					putchar('Y');
411					break;
412				default:
413					printf("%d?", *bp);
414					break;
415				}
416				++bp;
417				--size;
418				first = 0;
419			}
420			break;
421
422		case 'b':
423		default:
424			/* Bytes */
425			while (size > 0) {
426				if (!first)
427					putchar('.');
428				printf("%d", *bp);
429				++bp;
430				--size;
431				first = 0;
432			}
433			break;
434		}
435		/* Data left over? */
436		if (size)
437			printf("[len %d]", len);
438	}
439}
440
441static void
442cmu_print(register const u_char *bp, register u_int length)
443{
444	register const struct cmu_vend *cmu;
445	static const char fmt[] = " %s:%s";
446
447#define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
448    if (cmu->m.s_addr != 0) \
449	printf(fmt, s, ipaddr_string(&cmu->m.s_addr)); }
450
451	printf(" vend-cmu");
452	cmu = (struct cmu_vend *)bp;
453
454	/* Only print if there are unknown bits */
455	TCHECK(cmu->v_flags);
456	if ((cmu->v_flags & ~(VF_SMASK)) != 0)
457		printf(" F:0x%x", cmu->v_flags);
458	PRINTCMUADDR(v_dgate, "DG");
459	PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
460	PRINTCMUADDR(v_dns1, "NS1");
461	PRINTCMUADDR(v_dns2, "NS2");
462	PRINTCMUADDR(v_ins1, "IEN1");
463	PRINTCMUADDR(v_ins2, "IEN2");
464	PRINTCMUADDR(v_ts1, "TS1");
465	PRINTCMUADDR(v_ts2, "TS2");
466	return;
467
468trunc:
469	fputs(tstr, stdout);
470#undef PRINTCMUADDR
471}
472