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Use the word 'invalid' for 'malformed' or 'corrupted' packets
[tcpdump] / print-bootp.c
1 /*
2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Format and print bootp packets.
22 */
23
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27
28 #include <tcpdump-stdinc.h>
29
30 #include <string.h>
31
32 #include "netdissect.h"
33 #include "addrtoname.h"
34 #include "extract.h"
35
36 static const char tstr[] = " [|bootp]";
37
38 /*
39 * Bootstrap Protocol (BOOTP). RFC951 and RFC1048.
40 *
41 * This file specifies the "implementation-independent" BOOTP protocol
42 * information which is common to both client and server.
43 *
44 * Copyright 1988 by Carnegie Mellon.
45 *
46 * Permission to use, copy, modify, and distribute this program for any
47 * purpose and without fee is hereby granted, provided that this copyright
48 * and permission notice appear on all copies and supporting documentation,
49 * the name of Carnegie Mellon not be used in advertising or publicity
50 * pertaining to distribution of the program without specific prior
51 * permission, and notice be given in supporting documentation that copying
52 * and distribution is by permission of Carnegie Mellon and Stanford
53 * University. Carnegie Mellon makes no representations about the
54 * suitability of this software for any purpose. It is provided "as is"
55 * without express or implied warranty.
56 */
57
58 struct bootp {
59 uint8_t bp_op; /* packet opcode type */
60 uint8_t bp_htype; /* hardware addr type */
61 uint8_t bp_hlen; /* hardware addr length */
62 uint8_t bp_hops; /* gateway hops */
63 uint32_t bp_xid; /* transaction ID */
64 uint16_t bp_secs; /* seconds since boot began */
65 uint16_t bp_flags; /* flags - see bootp_flag_values[]
66 in print-bootp.c */
67 struct in_addr bp_ciaddr; /* client IP address */
68 struct in_addr bp_yiaddr; /* 'your' IP address */
69 struct in_addr bp_siaddr; /* server IP address */
70 struct in_addr bp_giaddr; /* gateway IP address */
71 uint8_t bp_chaddr[16]; /* client hardware address */
72 uint8_t bp_sname[64]; /* server host name */
73 uint8_t bp_file[128]; /* boot file name */
74 uint8_t bp_vend[64]; /* vendor-specific area */
75 } UNALIGNED;
76
77 #define BOOTPREPLY 2
78 #define BOOTPREQUEST 1
79
80 /*
81 * Vendor magic cookie (v_magic) for CMU
82 */
83 #define VM_CMU "CMU"
84
85 /*
86 * Vendor magic cookie (v_magic) for RFC1048
87 */
88 #define VM_RFC1048 { 99, 130, 83, 99 }
89
90 /*
91 * RFC1048 tag values used to specify what information is being supplied in
92 * the vendor field of the packet.
93 */
94
95 #define TAG_PAD ((uint8_t) 0)
96 #define TAG_SUBNET_MASK ((uint8_t) 1)
97 #define TAG_TIME_OFFSET ((uint8_t) 2)
98 #define TAG_GATEWAY ((uint8_t) 3)
99 #define TAG_TIME_SERVER ((uint8_t) 4)
100 #define TAG_NAME_SERVER ((uint8_t) 5)
101 #define TAG_DOMAIN_SERVER ((uint8_t) 6)
102 #define TAG_LOG_SERVER ((uint8_t) 7)
103 #define TAG_COOKIE_SERVER ((uint8_t) 8)
104 #define TAG_LPR_SERVER ((uint8_t) 9)
105 #define TAG_IMPRESS_SERVER ((uint8_t) 10)
106 #define TAG_RLP_SERVER ((uint8_t) 11)
107 #define TAG_HOSTNAME ((uint8_t) 12)
108 #define TAG_BOOTSIZE ((uint8_t) 13)
109 #define TAG_END ((uint8_t) 255)
110 /* RFC1497 tags */
111 #define TAG_DUMPPATH ((uint8_t) 14)
112 #define TAG_DOMAINNAME ((uint8_t) 15)
113 #define TAG_SWAP_SERVER ((uint8_t) 16)
114 #define TAG_ROOTPATH ((uint8_t) 17)
115 #define TAG_EXTPATH ((uint8_t) 18)
116 /* RFC2132 */
117 #define TAG_IP_FORWARD ((uint8_t) 19)
118 #define TAG_NL_SRCRT ((uint8_t) 20)
119 #define TAG_PFILTERS ((uint8_t) 21)
120 #define TAG_REASS_SIZE ((uint8_t) 22)
121 #define TAG_DEF_TTL ((uint8_t) 23)
122 #define TAG_MTU_TIMEOUT ((uint8_t) 24)
123 #define TAG_MTU_TABLE ((uint8_t) 25)
124 #define TAG_INT_MTU ((uint8_t) 26)
125 #define TAG_LOCAL_SUBNETS ((uint8_t) 27)
126 #define TAG_BROAD_ADDR ((uint8_t) 28)
127 #define TAG_DO_MASK_DISC ((uint8_t) 29)
128 #define TAG_SUPPLY_MASK ((uint8_t) 30)
129 #define TAG_DO_RDISC ((uint8_t) 31)
130 #define TAG_RTR_SOL_ADDR ((uint8_t) 32)
131 #define TAG_STATIC_ROUTE ((uint8_t) 33)
132 #define TAG_USE_TRAILERS ((uint8_t) 34)
133 #define TAG_ARP_TIMEOUT ((uint8_t) 35)
134 #define TAG_ETH_ENCAP ((uint8_t) 36)
135 #define TAG_TCP_TTL ((uint8_t) 37)
136 #define TAG_TCP_KEEPALIVE ((uint8_t) 38)
137 #define TAG_KEEPALIVE_GO ((uint8_t) 39)
138 #define TAG_NIS_DOMAIN ((uint8_t) 40)
139 #define TAG_NIS_SERVERS ((uint8_t) 41)
140 #define TAG_NTP_SERVERS ((uint8_t) 42)
141 #define TAG_VENDOR_OPTS ((uint8_t) 43)
142 #define TAG_NETBIOS_NS ((uint8_t) 44)
143 #define TAG_NETBIOS_DDS ((uint8_t) 45)
144 #define TAG_NETBIOS_NODE ((uint8_t) 46)
145 #define TAG_NETBIOS_SCOPE ((uint8_t) 47)
146 #define TAG_XWIN_FS ((uint8_t) 48)
147 #define TAG_XWIN_DM ((uint8_t) 49)
148 #define TAG_NIS_P_DOMAIN ((uint8_t) 64)
149 #define TAG_NIS_P_SERVERS ((uint8_t) 65)
150 #define TAG_MOBILE_HOME ((uint8_t) 68)
151 #define TAG_SMPT_SERVER ((uint8_t) 69)
152 #define TAG_POP3_SERVER ((uint8_t) 70)
153 #define TAG_NNTP_SERVER ((uint8_t) 71)
154 #define TAG_WWW_SERVER ((uint8_t) 72)
155 #define TAG_FINGER_SERVER ((uint8_t) 73)
156 #define TAG_IRC_SERVER ((uint8_t) 74)
157 #define TAG_STREETTALK_SRVR ((uint8_t) 75)
158 #define TAG_STREETTALK_STDA ((uint8_t) 76)
159 /* DHCP options */
160 #define TAG_REQUESTED_IP ((uint8_t) 50)
161 #define TAG_IP_LEASE ((uint8_t) 51)
162 #define TAG_OPT_OVERLOAD ((uint8_t) 52)
163 #define TAG_TFTP_SERVER ((uint8_t) 66)
164 #define TAG_BOOTFILENAME ((uint8_t) 67)
165 #define TAG_DHCP_MESSAGE ((uint8_t) 53)
166 #define TAG_SERVER_ID ((uint8_t) 54)
167 #define TAG_PARM_REQUEST ((uint8_t) 55)
168 #define TAG_MESSAGE ((uint8_t) 56)
169 #define TAG_MAX_MSG_SIZE ((uint8_t) 57)
170 #define TAG_RENEWAL_TIME ((uint8_t) 58)
171 #define TAG_REBIND_TIME ((uint8_t) 59)
172 #define TAG_VENDOR_CLASS ((uint8_t) 60)
173 #define TAG_CLIENT_ID ((uint8_t) 61)
174 /* RFC 2241 */
175 #define TAG_NDS_SERVERS ((uint8_t) 85)
176 #define TAG_NDS_TREE_NAME ((uint8_t) 86)
177 #define TAG_NDS_CONTEXT ((uint8_t) 87)
178 /* RFC 2242 */
179 #define TAG_NDS_IPDOMAIN ((uint8_t) 62)
180 #define TAG_NDS_IPINFO ((uint8_t) 63)
181 /* RFC 2485 */
182 #define TAG_OPEN_GROUP_UAP ((uint8_t) 98)
183 /* RFC 2563 */
184 #define TAG_DISABLE_AUTOCONF ((uint8_t) 116)
185 /* RFC 2610 */
186 #define TAG_SLP_DA ((uint8_t) 78)
187 #define TAG_SLP_SCOPE ((uint8_t) 79)
188 /* RFC 2937 */
189 #define TAG_NS_SEARCH ((uint8_t) 117)
190 /* RFC 3004 - The User Class Option for DHCP */
191 #define TAG_USER_CLASS ((uint8_t) 77)
192 /* RFC 3011 */
193 #define TAG_IP4_SUBNET_SELECT ((uint8_t) 118)
194 /* RFC 3442 */
195 #define TAG_CLASSLESS_STATIC_RT ((uint8_t) 121)
196 #define TAG_CLASSLESS_STA_RT_MS ((uint8_t) 249)
197 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */
198 #define TAG_TFTP_SERVER_ADDRESS ((uint8_t) 150)
199 /* ftp://ftp.isi.edu/.../assignments/bootp-dhcp-extensions */
200 #define TAG_SLP_NAMING_AUTH ((uint8_t) 80)
201 #define TAG_CLIENT_FQDN ((uint8_t) 81)
202 #define TAG_AGENT_CIRCUIT ((uint8_t) 82)
203 #define TAG_AGENT_REMOTE ((uint8_t) 83)
204 #define TAG_AGENT_MASK ((uint8_t) 84)
205 #define TAG_TZ_STRING ((uint8_t) 88)
206 #define TAG_FQDN_OPTION ((uint8_t) 89)
207 #define TAG_AUTH ((uint8_t) 90)
208 #define TAG_VINES_SERVERS ((uint8_t) 91)
209 #define TAG_SERVER_RANK ((uint8_t) 92)
210 #define TAG_CLIENT_ARCH ((uint8_t) 93)
211 #define TAG_CLIENT_NDI ((uint8_t) 94)
212 #define TAG_CLIENT_GUID ((uint8_t) 97)
213 #define TAG_LDAP_URL ((uint8_t) 95)
214 #define TAG_6OVER4 ((uint8_t) 96)
215 #define TAG_PRINTER_NAME ((uint8_t) 100)
216 #define TAG_MDHCP_SERVER ((uint8_t) 101)
217 #define TAG_IPX_COMPAT ((uint8_t) 110)
218 #define TAG_NETINFO_PARENT ((uint8_t) 112)
219 #define TAG_NETINFO_PARENT_TAG ((uint8_t) 113)
220 #define TAG_URL ((uint8_t) 114)
221 #define TAG_FAILOVER ((uint8_t) 115)
222 #define TAG_EXTENDED_REQUEST ((uint8_t) 126)
223 #define TAG_EXTENDED_OPTION ((uint8_t) 127)
224
225 /* DHCP Message types (values for TAG_DHCP_MESSAGE option) */
226 #define DHCPDISCOVER 1
227 #define DHCPOFFER 2
228 #define DHCPREQUEST 3
229 #define DHCPDECLINE 4
230 #define DHCPACK 5
231 #define DHCPNAK 6
232 #define DHCPRELEASE 7
233 #define DHCPINFORM 8
234
235 /*
236 * "vendor" data permitted for CMU bootp clients.
237 */
238
239 struct cmu_vend {
240 uint8_t v_magic[4]; /* magic number */
241 uint32_t v_flags; /* flags/opcodes, etc. */
242 struct in_addr v_smask; /* Subnet mask */
243 struct in_addr v_dgate; /* Default gateway */
244 struct in_addr v_dns1, v_dns2; /* Domain name servers */
245 struct in_addr v_ins1, v_ins2; /* IEN-116 name servers */
246 struct in_addr v_ts1, v_ts2; /* Time servers */
247 uint8_t v_unused[24]; /* currently unused */
248 } UNALIGNED;
249
250
251 /* v_flags values */
252 #define VF_SMASK 1 /* Subnet mask field contains valid data */
253
254 /* RFC 4702 DHCP Client FQDN Option */
255
256 #define CLIENT_FQDN_FLAGS_S 0x01
257 #define CLIENT_FQDN_FLAGS_O 0x02
258 #define CLIENT_FQDN_FLAGS_E 0x04
259 #define CLIENT_FQDN_FLAGS_N 0x08
260 /* end of original bootp.h */
261
262 static void rfc1048_print(netdissect_options *, const u_char *);
263 static void cmu_print(netdissect_options *, const u_char *);
264 static char *client_fqdn_flags(u_int flags);
265
266 static const struct tok bootp_flag_values[] = {
267 { 0x8000, "Broadcast" },
268 { 0, NULL}
269 };
270
271 static const struct tok bootp_op_values[] = {
272 { BOOTPREQUEST, "Request" },
273 { BOOTPREPLY, "Reply" },
274 { 0, NULL}
275 };
276
277 /*
278 * Print bootp requests
279 */
280 void
281 bootp_print(netdissect_options *ndo,
282 register const u_char *cp, u_int length)
283 {
284 register const struct bootp *bp;
285 static const u_char vm_cmu[4] = VM_CMU;
286 static const u_char vm_rfc1048[4] = VM_RFC1048;
287
288 bp = (const struct bootp *)cp;
289 ND_TCHECK(bp->bp_op);
290
291 ND_PRINT((ndo, "BOOTP/DHCP, %s",
292 tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op)));
293
294 if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
295 ND_TCHECK2(bp->bp_chaddr[0], 6);
296 ND_PRINT((ndo, " from %s", etheraddr_string(ndo, bp->bp_chaddr)));
297 }
298
299 ND_PRINT((ndo, ", length %u", length));
300
301 if (!ndo->ndo_vflag)
302 return;
303
304 ND_TCHECK(bp->bp_secs);
305
306 /* The usual hardware address type is 1 (10Mb Ethernet) */
307 if (bp->bp_htype != 1)
308 ND_PRINT((ndo, ", htype %d", bp->bp_htype));
309
310 /* The usual length for 10Mb Ethernet address is 6 bytes */
311 if (bp->bp_htype != 1 || bp->bp_hlen != 6)
312 ND_PRINT((ndo, ", hlen %d", bp->bp_hlen));
313
314 /* Only print interesting fields */
315 if (bp->bp_hops)
316 ND_PRINT((ndo, ", hops %d", bp->bp_hops));
317 if (EXTRACT_32BITS(&bp->bp_xid))
318 ND_PRINT((ndo, ", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid)));
319 if (EXTRACT_16BITS(&bp->bp_secs))
320 ND_PRINT((ndo, ", secs %d", EXTRACT_16BITS(&bp->bp_secs)));
321
322 ND_PRINT((ndo, ", Flags [%s]",
323 bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags))));
324 if (ndo->ndo_vflag > 1)
325 ND_PRINT((ndo, " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags)));
326
327 /* Client's ip address */
328 ND_TCHECK(bp->bp_ciaddr);
329 if (EXTRACT_32BITS(&bp->bp_ciaddr.s_addr))
330 ND_PRINT((ndo, "\n\t Client-IP %s", ipaddr_string(ndo, &bp->bp_ciaddr)));
331
332 /* 'your' ip address (bootp client) */
333 ND_TCHECK(bp->bp_yiaddr);
334 if (EXTRACT_32BITS(&bp->bp_yiaddr.s_addr))
335 ND_PRINT((ndo, "\n\t Your-IP %s", ipaddr_string(ndo, &bp->bp_yiaddr)));
336
337 /* Server's ip address */
338 ND_TCHECK(bp->bp_siaddr);
339 if (EXTRACT_32BITS(&bp->bp_siaddr.s_addr))
340 ND_PRINT((ndo, "\n\t Server-IP %s", ipaddr_string(ndo, &bp->bp_siaddr)));
341
342 /* Gateway's ip address */
343 ND_TCHECK(bp->bp_giaddr);
344 if (EXTRACT_32BITS(&bp->bp_giaddr.s_addr))
345 ND_PRINT((ndo, "\n\t Gateway-IP %s", ipaddr_string(ndo, &bp->bp_giaddr)));
346
347 /* Client's Ethernet address */
348 if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
349 ND_TCHECK2(bp->bp_chaddr[0], 6);
350 ND_PRINT((ndo, "\n\t Client-Ethernet-Address %s", etheraddr_string(ndo, bp->bp_chaddr)));
351 }
352
353 ND_TCHECK2(bp->bp_sname[0], 1); /* check first char only */
354 if (*bp->bp_sname) {
355 ND_PRINT((ndo, "\n\t sname \""));
356 if (fn_print(ndo, bp->bp_sname, ndo->ndo_snapend)) {
357 ND_PRINT((ndo, "\""));
358 ND_PRINT((ndo, "%s", tstr + 1));
359 return;
360 }
361 ND_PRINT((ndo, "\""));
362 }
363 ND_TCHECK2(bp->bp_file[0], 1); /* check first char only */
364 if (*bp->bp_file) {
365 ND_PRINT((ndo, "\n\t file \""));
366 if (fn_print(ndo, bp->bp_file, ndo->ndo_snapend)) {
367 ND_PRINT((ndo, "\""));
368 ND_PRINT((ndo, "%s", tstr + 1));
369 return;
370 }
371 ND_PRINT((ndo, "\""));
372 }
373
374 /* Decode the vendor buffer */
375 ND_TCHECK(bp->bp_vend[0]);
376 if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
377 sizeof(uint32_t)) == 0)
378 rfc1048_print(ndo, bp->bp_vend);
379 else if (memcmp((const char *)bp->bp_vend, vm_cmu,
380 sizeof(uint32_t)) == 0)
381 cmu_print(ndo, bp->bp_vend);
382 else {
383 uint32_t ul;
384
385 ul = EXTRACT_32BITS(&bp->bp_vend);
386 if (ul != 0)
387 ND_PRINT((ndo, "\n\t Vendor-#0x%x", ul));
388 }
389
390 return;
391 trunc:
392 ND_PRINT((ndo, "%s", tstr));
393 }
394
395 /*
396 * The first character specifies the format to print:
397 * i - ip address (32 bits)
398 * p - ip address pairs (32 bits + 32 bits)
399 * l - long (32 bits)
400 * L - unsigned long (32 bits)
401 * s - short (16 bits)
402 * b - period-seperated decimal bytes (variable length)
403 * x - colon-seperated hex bytes (variable length)
404 * a - ascii string (variable length)
405 * B - on/off (8 bits)
406 * $ - special (explicit code to handle)
407 */
408 static const struct tok tag2str[] = {
409 /* RFC1048 tags */
410 { TAG_PAD, " PAD" },
411 { TAG_SUBNET_MASK, "iSubnet-Mask" }, /* subnet mask (RFC950) */
412 { TAG_TIME_OFFSET, "LTime-Zone" }, /* seconds from UTC */
413 { TAG_GATEWAY, "iDefault-Gateway" }, /* default gateway */
414 { TAG_TIME_SERVER, "iTime-Server" }, /* time servers (RFC868) */
415 { TAG_NAME_SERVER, "iIEN-Name-Server" }, /* IEN name servers (IEN116) */
416 { TAG_DOMAIN_SERVER, "iDomain-Name-Server" }, /* domain name (RFC1035) */
417 { TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */
418 { TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */
419 { TAG_LPR_SERVER, "iLPR-Server" }, /* lpr server (RFC1179) */
420 { TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */
421 { TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */
422 { TAG_HOSTNAME, "aHostname" }, /* ascii hostname */
423 { TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */
424 { TAG_END, " END" },
425 /* RFC1497 tags */
426 { TAG_DUMPPATH, "aDP" },
427 { TAG_DOMAINNAME, "aDomain-Name" },
428 { TAG_SWAP_SERVER, "iSS" },
429 { TAG_ROOTPATH, "aRP" },
430 { TAG_EXTPATH, "aEP" },
431 /* RFC2132 tags */
432 { TAG_IP_FORWARD, "BIPF" },
433 { TAG_NL_SRCRT, "BSRT" },
434 { TAG_PFILTERS, "pPF" },
435 { TAG_REASS_SIZE, "sRSZ" },
436 { TAG_DEF_TTL, "bTTL" },
437 { TAG_MTU_TIMEOUT, "lMTU-Timeout" },
438 { TAG_MTU_TABLE, "sMTU-Table" },
439 { TAG_INT_MTU, "sMTU" },
440 { TAG_LOCAL_SUBNETS, "BLSN" },
441 { TAG_BROAD_ADDR, "iBR" },
442 { TAG_DO_MASK_DISC, "BMD" },
443 { TAG_SUPPLY_MASK, "BMS" },
444 { TAG_DO_RDISC, "BRouter-Discovery" },
445 { TAG_RTR_SOL_ADDR, "iRSA" },
446 { TAG_STATIC_ROUTE, "pStatic-Route" },
447 { TAG_USE_TRAILERS, "BUT" },
448 { TAG_ARP_TIMEOUT, "lAT" },
449 { TAG_ETH_ENCAP, "BIE" },
450 { TAG_TCP_TTL, "bTT" },
451 { TAG_TCP_KEEPALIVE, "lKI" },
452 { TAG_KEEPALIVE_GO, "BKG" },
453 { TAG_NIS_DOMAIN, "aYD" },
454 { TAG_NIS_SERVERS, "iYS" },
455 { TAG_NTP_SERVERS, "iNTP" },
456 { TAG_VENDOR_OPTS, "bVendor-Option" },
457 { TAG_NETBIOS_NS, "iNetbios-Name-Server" },
458 { TAG_NETBIOS_DDS, "iWDD" },
459 { TAG_NETBIOS_NODE, "$Netbios-Node" },
460 { TAG_NETBIOS_SCOPE, "aNetbios-Scope" },
461 { TAG_XWIN_FS, "iXFS" },
462 { TAG_XWIN_DM, "iXDM" },
463 { TAG_NIS_P_DOMAIN, "sN+D" },
464 { TAG_NIS_P_SERVERS, "iN+S" },
465 { TAG_MOBILE_HOME, "iMH" },
466 { TAG_SMPT_SERVER, "iSMTP" },
467 { TAG_POP3_SERVER, "iPOP3" },
468 { TAG_NNTP_SERVER, "iNNTP" },
469 { TAG_WWW_SERVER, "iWWW" },
470 { TAG_FINGER_SERVER, "iFG" },
471 { TAG_IRC_SERVER, "iIRC" },
472 { TAG_STREETTALK_SRVR, "iSTS" },
473 { TAG_STREETTALK_STDA, "iSTDA" },
474 { TAG_REQUESTED_IP, "iRequested-IP" },
475 { TAG_IP_LEASE, "lLease-Time" },
476 { TAG_OPT_OVERLOAD, "$OO" },
477 { TAG_TFTP_SERVER, "aTFTP" },
478 { TAG_BOOTFILENAME, "aBF" },
479 { TAG_DHCP_MESSAGE, " DHCP-Message" },
480 { TAG_SERVER_ID, "iServer-ID" },
481 { TAG_PARM_REQUEST, "bParameter-Request" },
482 { TAG_MESSAGE, "aMSG" },
483 { TAG_MAX_MSG_SIZE, "sMSZ" },
484 { TAG_RENEWAL_TIME, "lRN" },
485 { TAG_REBIND_TIME, "lRB" },
486 { TAG_VENDOR_CLASS, "aVendor-Class" },
487 { TAG_CLIENT_ID, "$Client-ID" },
488 /* RFC 2485 */
489 { TAG_OPEN_GROUP_UAP, "aUAP" },
490 /* RFC 2563 */
491 { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
492 /* RFC 2610 */
493 { TAG_SLP_DA, "bSLP-DA" }, /*"b" is a little wrong */
494 { TAG_SLP_SCOPE, "bSLP-SCOPE" }, /*"b" is a little wrong */
495 /* RFC 2937 */
496 { TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */
497 /* RFC 3004 - The User Class Option for DHCP */
498 { TAG_USER_CLASS, "$User-Class" },
499 /* RFC 3011 */
500 { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
501 /* RFC 3442 */
502 { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
503 { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
504 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */
505 { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" },
506 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
507 { TAG_SLP_NAMING_AUTH, "aSLP-NA" },
508 { TAG_CLIENT_FQDN, "$FQDN" },
509 { TAG_AGENT_CIRCUIT, "$Agent-Information" },
510 { TAG_AGENT_REMOTE, "bARMT" },
511 { TAG_AGENT_MASK, "bAMSK" },
512 { TAG_TZ_STRING, "aTZSTR" },
513 { TAG_FQDN_OPTION, "bFQDNS" }, /* XXX 'b' */
514 { TAG_AUTH, "bAUTH" }, /* XXX 'b' */
515 { TAG_VINES_SERVERS, "iVINES" },
516 { TAG_SERVER_RANK, "sRANK" },
517 { TAG_CLIENT_ARCH, "sARCH" },
518 { TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */
519 { TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */
520 { TAG_LDAP_URL, "aLDAP" },
521 { TAG_6OVER4, "i6o4" },
522 { TAG_PRINTER_NAME, "aPRTR" },
523 { TAG_MDHCP_SERVER, "bMDHCP" }, /* XXX 'b' */
524 { TAG_IPX_COMPAT, "bIPX" }, /* XXX 'b' */
525 { TAG_NETINFO_PARENT, "iNI" },
526 { TAG_NETINFO_PARENT_TAG, "aNITAG" },
527 { TAG_URL, "aURL" },
528 { TAG_FAILOVER, "bFAIL" }, /* XXX 'b' */
529 { 0, NULL }
530 };
531 /* 2-byte extended tags */
532 static const struct tok xtag2str[] = {
533 { 0, NULL }
534 };
535
536 /* DHCP "options overload" types */
537 static const struct tok oo2str[] = {
538 { 1, "file" },
539 { 2, "sname" },
540 { 3, "file+sname" },
541 { 0, NULL }
542 };
543
544 /* NETBIOS over TCP/IP node type options */
545 static const struct tok nbo2str[] = {
546 { 0x1, "b-node" },
547 { 0x2, "p-node" },
548 { 0x4, "m-node" },
549 { 0x8, "h-node" },
550 { 0, NULL }
551 };
552
553 /* ARP Hardware types, for Client-ID option */
554 static const struct tok arp2str[] = {
555 { 0x1, "ether" },
556 { 0x6, "ieee802" },
557 { 0x7, "arcnet" },
558 { 0xf, "frelay" },
559 { 0x17, "strip" },
560 { 0x18, "ieee1394" },
561 { 0, NULL }
562 };
563
564 static const struct tok dhcp_msg_values[] = {
565 { DHCPDISCOVER, "Discover" },
566 { DHCPOFFER, "Offer" },
567 { DHCPREQUEST, "Request" },
568 { DHCPDECLINE, "Decline" },
569 { DHCPACK, "ACK" },
570 { DHCPNAK, "NACK" },
571 { DHCPRELEASE, "Release" },
572 { DHCPINFORM, "Inform" },
573 { 0, NULL }
574 };
575
576 #define AGENT_SUBOPTION_CIRCUIT_ID 1 /* RFC 3046 */
577 #define AGENT_SUBOPTION_REMOTE_ID 2 /* RFC 3046 */
578 #define AGENT_SUBOPTION_SUBSCRIBER_ID 6 /* RFC 3993 */
579 static const struct tok agent_suboption_values[] = {
580 { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
581 { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" },
582 { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
583 { 0, NULL }
584 };
585
586
587 static void
588 rfc1048_print(netdissect_options *ndo,
589 register const u_char *bp)
590 {
591 register uint16_t tag;
592 register u_int len;
593 register const char *cp;
594 register char c;
595 int first, idx;
596 uint32_t ul;
597 uint16_t us;
598 uint8_t uc, subopt, suboptlen;
599
600 ND_PRINT((ndo, "\n\t Vendor-rfc1048 Extensions"));
601
602 /* Step over magic cookie */
603 ND_PRINT((ndo, "\n\t Magic Cookie 0x%08x", EXTRACT_32BITS(bp)));
604 bp += sizeof(int32_t);
605
606 /* Loop while we there is a tag left in the buffer */
607 while (ND_TTEST2(*bp, 1)) {
608 tag = *bp++;
609 if (tag == TAG_PAD && ndo->ndo_vflag < 3)
610 continue;
611 if (tag == TAG_END && ndo->ndo_vflag < 3)
612 return;
613 if (tag == TAG_EXTENDED_OPTION) {
614 ND_TCHECK2(*(bp + 1), 2);
615 tag = EXTRACT_16BITS(bp + 1);
616 /* XXX we don't know yet if the IANA will
617 * preclude overlap of 1-byte and 2-byte spaces.
618 * If not, we need to offset tag after this step.
619 */
620 cp = tok2str(xtag2str, "?xT%u", tag);
621 } else
622 cp = tok2str(tag2str, "?T%u", tag);
623 c = *cp++;
624
625 if (tag == TAG_PAD || tag == TAG_END)
626 len = 0;
627 else {
628 /* Get the length; check for truncation */
629 ND_TCHECK2(*bp, 1);
630 len = *bp++;
631 }
632
633 ND_PRINT((ndo, "\n\t %s Option %u, length %u%s", cp, tag, len,
634 len > 0 ? ": " : ""));
635
636 if (tag == TAG_PAD && ndo->ndo_vflag > 2) {
637 u_int ntag = 1;
638 while (ND_TTEST2(*bp, 1) && *bp == TAG_PAD) {
639 bp++;
640 ntag++;
641 }
642 if (ntag > 1)
643 ND_PRINT((ndo, ", occurs %u", ntag));
644 }
645
646 if (!ND_TTEST2(*bp, len)) {
647 ND_PRINT((ndo, "[|rfc1048 %u]", len));
648 return;
649 }
650
651 if (tag == TAG_DHCP_MESSAGE && len == 1) {
652 uc = *bp++;
653 ND_PRINT((ndo, "%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc)));
654 continue;
655 }
656
657 if (tag == TAG_PARM_REQUEST) {
658 idx = 0;
659 while (len-- > 0) {
660 uc = *bp++;
661 cp = tok2str(tag2str, "?Option %u", uc);
662 if (idx % 4 == 0)
663 ND_PRINT((ndo, "\n\t "));
664 else
665 ND_PRINT((ndo, ", "));
666 ND_PRINT((ndo, "%s", cp + 1));
667 idx++;
668 }
669 continue;
670 }
671
672 if (tag == TAG_EXTENDED_REQUEST) {
673 first = 1;
674 while (len > 1) {
675 len -= 2;
676 us = EXTRACT_16BITS(bp);
677 bp += 2;
678 cp = tok2str(xtag2str, "?xT%u", us);
679 if (!first)
680 ND_PRINT((ndo, "+"));
681 ND_PRINT((ndo, "%s", cp + 1));
682 first = 0;
683 }
684 continue;
685 }
686
687 /* Print data */
688 if (c == '?') {
689 /* Base default formats for unknown tags on data size */
690 if (len & 1)
691 c = 'b';
692 else if (len & 2)
693 c = 's';
694 else
695 c = 'l';
696 }
697 first = 1;
698 switch (c) {
699
700 case 'a':
701 /* ascii strings */
702 ND_PRINT((ndo, "\""));
703 if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
704 ND_PRINT((ndo, "\""));
705 goto trunc;
706 }
707 ND_PRINT((ndo, "\""));
708 bp += len;
709 len = 0;
710 break;
711
712 case 'i':
713 case 'l':
714 case 'L':
715 /* ip addresses/32-bit words */
716 while (len >= sizeof(ul)) {
717 if (!first)
718 ND_PRINT((ndo, ","));
719 ul = EXTRACT_32BITS(bp);
720 if (c == 'i') {
721 ul = htonl(ul);
722 ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ul)));
723 } else if (c == 'L')
724 ND_PRINT((ndo, "%d", ul));
725 else
726 ND_PRINT((ndo, "%u", ul));
727 bp += sizeof(ul);
728 len -= sizeof(ul);
729 first = 0;
730 }
731 break;
732
733 case 'p':
734 /* IP address pairs */
735 while (len >= 2*sizeof(ul)) {
736 if (!first)
737 ND_PRINT((ndo, ","));
738 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
739 ND_PRINT((ndo, "(%s:", ipaddr_string(ndo, &ul)));
740 bp += sizeof(ul);
741 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
742 ND_PRINT((ndo, "%s)", ipaddr_string(ndo, &ul)));
743 bp += sizeof(ul);
744 len -= 2*sizeof(ul);
745 first = 0;
746 }
747 break;
748
749 case 's':
750 /* shorts */
751 while (len >= sizeof(us)) {
752 if (!first)
753 ND_PRINT((ndo, ","));
754 us = EXTRACT_16BITS(bp);
755 ND_PRINT((ndo, "%u", us));
756 bp += sizeof(us);
757 len -= sizeof(us);
758 first = 0;
759 }
760 break;
761
762 case 'B':
763 /* boolean */
764 while (len > 0) {
765 if (!first)
766 ND_PRINT((ndo, ","));
767 switch (*bp) {
768 case 0:
769 ND_PRINT((ndo, "N"));
770 break;
771 case 1:
772 ND_PRINT((ndo, "Y"));
773 break;
774 default:
775 ND_PRINT((ndo, "%u?", *bp));
776 break;
777 }
778 ++bp;
779 --len;
780 first = 0;
781 }
782 break;
783
784 case 'b':
785 case 'x':
786 default:
787 /* Bytes */
788 while (len > 0) {
789 if (!first)
790 ND_PRINT((ndo, c == 'x' ? ":" : "."));
791 if (c == 'x')
792 ND_PRINT((ndo, "%02x", *bp));
793 else
794 ND_PRINT((ndo, "%u", *bp));
795 ++bp;
796 --len;
797 first = 0;
798 }
799 break;
800
801 case '$':
802 /* Guys we can't handle with one of the usual cases */
803 switch (tag) {
804
805 case TAG_NETBIOS_NODE:
806 /* this option should be at least 1 byte long */
807 if (len < 1) {
808 ND_PRINT((ndo, "ERROR: length < 1 bytes"));
809 break;
810 }
811 tag = *bp++;
812 --len;
813 ND_PRINT((ndo, "%s", tok2str(nbo2str, NULL, tag)));
814 break;
815
816 case TAG_OPT_OVERLOAD:
817 /* this option should be at least 1 byte long */
818 if (len < 1) {
819 ND_PRINT((ndo, "ERROR: length < 1 bytes"));
820 break;
821 }
822 tag = *bp++;
823 --len;
824 ND_PRINT((ndo, "%s", tok2str(oo2str, NULL, tag)));
825 break;
826
827 case TAG_CLIENT_FQDN:
828 /* this option should be at least 3 bytes long */
829 if (len < 3) {
830 ND_PRINT((ndo, "ERROR: length < 3 bytes"));
831 bp += len;
832 len = 0;
833 break;
834 }
835 if (*bp)
836 ND_PRINT((ndo, "[%s] ", client_fqdn_flags(*bp)));
837 bp++;
838 if (*bp || *(bp+1))
839 ND_PRINT((ndo, "%u/%u ", *bp, *(bp+1)));
840 bp += 2;
841 ND_PRINT((ndo, "\""));
842 if (fn_printn(ndo, bp, len - 3, ndo->ndo_snapend)) {
843 ND_PRINT((ndo, "\""));
844 goto trunc;
845 }
846 ND_PRINT((ndo, "\""));
847 bp += len - 3;
848 len = 0;
849 break;
850
851 case TAG_CLIENT_ID:
852 {
853 int type;
854
855 /* this option should be at least 1 byte long */
856 if (len < 1) {
857 ND_PRINT((ndo, "ERROR: length < 1 bytes"));
858 break;
859 }
860 type = *bp++;
861 len--;
862 if (type == 0) {
863 ND_PRINT((ndo, "\""));
864 if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
865 ND_PRINT((ndo, "\""));
866 goto trunc;
867 }
868 ND_PRINT((ndo, "\""));
869 bp += len;
870 len = 0;
871 break;
872 } else {
873 ND_PRINT((ndo, "%s ", tok2str(arp2str, "hardware-type %u,", type)));
874 while (len > 0) {
875 if (!first)
876 ND_PRINT((ndo, ":"));
877 ND_PRINT((ndo, "%02x", *bp));
878 ++bp;
879 --len;
880 first = 0;
881 }
882 }
883 break;
884 }
885
886 case TAG_AGENT_CIRCUIT:
887 while (len >= 2) {
888 subopt = *bp++;
889 suboptlen = *bp++;
890 len -= 2;
891 if (suboptlen > len) {
892 ND_PRINT((ndo, "\n\t %s SubOption %u, length %u: length goes past end of option",
893 tok2str(agent_suboption_values, "Unknown", subopt),
894 subopt,
895 suboptlen));
896 bp += len;
897 len = 0;
898 break;
899 }
900 ND_PRINT((ndo, "\n\t %s SubOption %u, length %u: ",
901 tok2str(agent_suboption_values, "Unknown", subopt),
902 subopt,
903 suboptlen));
904 switch (subopt) {
905
906 case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
907 case AGENT_SUBOPTION_REMOTE_ID:
908 case AGENT_SUBOPTION_SUBSCRIBER_ID:
909 if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend))
910 goto trunc;
911 break;
912
913 default:
914 print_unknown_data(ndo, bp, "\n\t\t", suboptlen);
915 }
916
917 len -= suboptlen;
918 bp += suboptlen;
919 }
920 break;
921
922 case TAG_CLASSLESS_STATIC_RT:
923 case TAG_CLASSLESS_STA_RT_MS:
924 {
925 u_int mask_width, significant_octets, i;
926
927 /* this option should be at least 5 bytes long */
928 if (len < 5) {
929 ND_PRINT((ndo, "ERROR: length < 5 bytes"));
930 bp += len;
931 len = 0;
932 break;
933 }
934 while (len > 0) {
935 if (!first)
936 ND_PRINT((ndo, ","));
937 mask_width = *bp++;
938 len--;
939 /* mask_width <= 32 */
940 if (mask_width > 32) {
941 ND_PRINT((ndo, "[ERROR: Mask width (%d) > 32]", mask_width));
942 bp += len;
943 len = 0;
944 break;
945 }
946 significant_octets = (mask_width + 7) / 8;
947 /* significant octets + router(4) */
948 if (len < significant_octets + 4) {
949 ND_PRINT((ndo, "[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4));
950 bp += len;
951 len = 0;
952 break;
953 }
954 ND_PRINT((ndo, "("));
955 if (mask_width == 0)
956 ND_PRINT((ndo, "default"));
957 else {
958 for (i = 0; i < significant_octets ; i++) {
959 if (i > 0)
960 ND_PRINT((ndo, "."));
961 ND_PRINT((ndo, "%d", *bp++));
962 }
963 for (i = significant_octets ; i < 4 ; i++)
964 ND_PRINT((ndo, ".0"));
965 ND_PRINT((ndo, "/%d", mask_width));
966 }
967 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
968 ND_PRINT((ndo, ":%s)", ipaddr_string(ndo, &ul)));
969 bp += sizeof(ul);
970 len -= (significant_octets + 4);
971 first = 0;
972 }
973 break;
974 }
975
976 case TAG_USER_CLASS:
977 {
978 u_int suboptnumber = 1;
979
980 first = 1;
981 if (len < 2) {
982 ND_PRINT((ndo, "ERROR: length < 2 bytes"));
983 bp += len;
984 len = 0;
985 break;
986 }
987 while (len > 0) {
988 suboptlen = *bp++;
989 len--;
990 ND_PRINT((ndo, "\n\t "));
991 ND_PRINT((ndo, "instance#%u: ", suboptnumber));
992 if (suboptlen == 0) {
993 ND_PRINT((ndo, "ERROR: suboption length must be non-zero"));
994 bp += len;
995 len = 0;
996 break;
997 }
998 if (len < suboptlen) {
999 ND_PRINT((ndo, "ERROR: invalid option"));
1000 bp += len;
1001 len = 0;
1002 break;
1003 }
1004 ND_PRINT((ndo, "\""));
1005 if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) {
1006 ND_PRINT((ndo, "\""));
1007 goto trunc;
1008 }
1009 ND_PRINT((ndo, "\""));
1010 ND_PRINT((ndo, ", length %d", suboptlen));
1011 suboptnumber++;
1012 len -= suboptlen;
1013 bp += suboptlen;
1014 }
1015 break;
1016 }
1017
1018 default:
1019 ND_PRINT((ndo, "[unknown special tag %u, size %u]",
1020 tag, len));
1021 bp += len;
1022 len = 0;
1023 break;
1024 }
1025 break;
1026 }
1027 /* Data left over? */
1028 if (len) {
1029 ND_PRINT((ndo, "\n\t trailing data length %u", len));
1030 bp += len;
1031 }
1032 }
1033 return;
1034 trunc:
1035 ND_PRINT((ndo, "|[rfc1048]"));
1036 }
1037
1038 static void
1039 cmu_print(netdissect_options *ndo,
1040 register const u_char *bp)
1041 {
1042 register const struct cmu_vend *cmu;
1043
1044 #define PRINTCMUADDR(m, s) { ND_TCHECK(cmu->m); \
1045 if (cmu->m.s_addr != 0) \
1046 ND_PRINT((ndo, " %s:%s", s, ipaddr_string(ndo, &cmu->m.s_addr))); }
1047
1048 ND_PRINT((ndo, " vend-cmu"));
1049 cmu = (const struct cmu_vend *)bp;
1050
1051 /* Only print if there are unknown bits */
1052 ND_TCHECK(cmu->v_flags);
1053 if ((cmu->v_flags & ~(VF_SMASK)) != 0)
1054 ND_PRINT((ndo, " F:0x%x", cmu->v_flags));
1055 PRINTCMUADDR(v_dgate, "DG");
1056 PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
1057 PRINTCMUADDR(v_dns1, "NS1");
1058 PRINTCMUADDR(v_dns2, "NS2");
1059 PRINTCMUADDR(v_ins1, "IEN1");
1060 PRINTCMUADDR(v_ins2, "IEN2");
1061 PRINTCMUADDR(v_ts1, "TS1");
1062 PRINTCMUADDR(v_ts2, "TS2");
1063 return;
1064
1065 trunc:
1066 ND_PRINT((ndo, "%s", tstr));
1067 #undef PRINTCMUADDR
1068 }
1069
1070 static char *
1071 client_fqdn_flags(u_int flags)
1072 {
1073 static char buf[8+1];
1074 int i = 0;
1075
1076 if (flags & CLIENT_FQDN_FLAGS_S)
1077 buf[i++] = 'S';
1078 if (flags & CLIENT_FQDN_FLAGS_O)
1079 buf[i++] = 'O';
1080 if (flags & CLIENT_FQDN_FLAGS_E)
1081 buf[i++] = 'E';
1082 if (flags & CLIENT_FQDN_FLAGS_N)
1083 buf[i++] = 'N';
1084 buf[i] = '\0';
1085
1086 return buf;
1087 }
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