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Handle very large -f files by rejecting them.
[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
22 /* \summary: BOOTP and IPv4 DHCP printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #endif
27
28 #include <netdissect-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 /* RFC 4833, TZ codes */
216 #define TAG_TZ_PCODE ((uint8_t) 100)
217 #define TAG_TZ_TCODE ((uint8_t) 101)
218 #define TAG_IPX_COMPAT ((uint8_t) 110)
219 #define TAG_NETINFO_PARENT ((uint8_t) 112)
220 #define TAG_NETINFO_PARENT_TAG ((uint8_t) 113)
221 #define TAG_URL ((uint8_t) 114)
222 #define TAG_FAILOVER ((uint8_t) 115)
223 #define TAG_EXTENDED_REQUEST ((uint8_t) 126)
224 #define TAG_EXTENDED_OPTION ((uint8_t) 127)
225 #define TAG_MUDURL ((uint8_t) 161)
226
227 /* DHCP Message types (values for TAG_DHCP_MESSAGE option) */
228 #define DHCPDISCOVER 1
229 #define DHCPOFFER 2
230 #define DHCPREQUEST 3
231 #define DHCPDECLINE 4
232 #define DHCPACK 5
233 #define DHCPNAK 6
234 #define DHCPRELEASE 7
235 #define DHCPINFORM 8
236
237 /*
238 * "vendor" data permitted for CMU bootp clients.
239 */
240
241 struct cmu_vend {
242 uint8_t v_magic[4]; /* magic number */
243 uint32_t v_flags; /* flags/opcodes, etc. */
244 struct in_addr v_smask; /* Subnet mask */
245 struct in_addr v_dgate; /* Default gateway */
246 struct in_addr v_dns1, v_dns2; /* Domain name servers */
247 struct in_addr v_ins1, v_ins2; /* IEN-116 name servers */
248 struct in_addr v_ts1, v_ts2; /* Time servers */
249 uint8_t v_unused[24]; /* currently unused */
250 } UNALIGNED;
251
252
253 /* v_flags values */
254 #define VF_SMASK 1 /* Subnet mask field contains valid data */
255
256 /* RFC 4702 DHCP Client FQDN Option */
257
258 #define CLIENT_FQDN_FLAGS_S 0x01
259 #define CLIENT_FQDN_FLAGS_O 0x02
260 #define CLIENT_FQDN_FLAGS_E 0x04
261 #define CLIENT_FQDN_FLAGS_N 0x08
262 /* end of original bootp.h */
263
264 static void rfc1048_print(netdissect_options *, const u_char *);
265 static void cmu_print(netdissect_options *, const u_char *);
266 static char *client_fqdn_flags(u_int flags);
267
268 static const struct tok bootp_flag_values[] = {
269 { 0x8000, "Broadcast" },
270 { 0, NULL}
271 };
272
273 static const struct tok bootp_op_values[] = {
274 { BOOTPREQUEST, "Request" },
275 { BOOTPREPLY, "Reply" },
276 { 0, NULL}
277 };
278
279 /*
280 * Print bootp requests
281 */
282 void
283 bootp_print(netdissect_options *ndo,
284 register const u_char *cp, u_int length)
285 {
286 register const struct bootp *bp;
287 static const u_char vm_cmu[4] = VM_CMU;
288 static const u_char vm_rfc1048[4] = VM_RFC1048;
289
290 bp = (const struct bootp *)cp;
291 ND_TCHECK(bp->bp_op);
292
293 ND_PRINT((ndo, "BOOTP/DHCP, %s",
294 tok2str(bootp_op_values, "unknown (0x%02x)", bp->bp_op)));
295
296 ND_TCHECK(bp->bp_hlen);
297 if (bp->bp_htype == 1 && bp->bp_hlen == 6 && bp->bp_op == BOOTPREQUEST) {
298 ND_TCHECK2(bp->bp_chaddr[0], 6);
299 ND_PRINT((ndo, " from %s", etheraddr_string(ndo, bp->bp_chaddr)));
300 }
301
302 ND_PRINT((ndo, ", length %u", length));
303
304 if (!ndo->ndo_vflag)
305 return;
306
307 ND_TCHECK(bp->bp_secs);
308
309 /* The usual hardware address type is 1 (10Mb Ethernet) */
310 if (bp->bp_htype != 1)
311 ND_PRINT((ndo, ", htype %d", bp->bp_htype));
312
313 /* The usual length for 10Mb Ethernet address is 6 bytes */
314 if (bp->bp_htype != 1 || bp->bp_hlen != 6)
315 ND_PRINT((ndo, ", hlen %d", bp->bp_hlen));
316
317 /* Only print interesting fields */
318 if (bp->bp_hops)
319 ND_PRINT((ndo, ", hops %d", bp->bp_hops));
320 if (EXTRACT_32BITS(&bp->bp_xid))
321 ND_PRINT((ndo, ", xid 0x%x", EXTRACT_32BITS(&bp->bp_xid)));
322 if (EXTRACT_16BITS(&bp->bp_secs))
323 ND_PRINT((ndo, ", secs %d", EXTRACT_16BITS(&bp->bp_secs)));
324
325 ND_TCHECK(bp->bp_flags);
326 ND_PRINT((ndo, ", Flags [%s]",
327 bittok2str(bootp_flag_values, "none", EXTRACT_16BITS(&bp->bp_flags))));
328 if (ndo->ndo_vflag > 1)
329 ND_PRINT((ndo, " (0x%04x)", EXTRACT_16BITS(&bp->bp_flags)));
330
331 /* Client's ip address */
332 ND_TCHECK(bp->bp_ciaddr);
333 if (EXTRACT_32BITS(&bp->bp_ciaddr.s_addr))
334 ND_PRINT((ndo, "\n\t Client-IP %s", ipaddr_string(ndo, &bp->bp_ciaddr)));
335
336 /* 'your' ip address (bootp client) */
337 ND_TCHECK(bp->bp_yiaddr);
338 if (EXTRACT_32BITS(&bp->bp_yiaddr.s_addr))
339 ND_PRINT((ndo, "\n\t Your-IP %s", ipaddr_string(ndo, &bp->bp_yiaddr)));
340
341 /* Server's ip address */
342 ND_TCHECK(bp->bp_siaddr);
343 if (EXTRACT_32BITS(&bp->bp_siaddr.s_addr))
344 ND_PRINT((ndo, "\n\t Server-IP %s", ipaddr_string(ndo, &bp->bp_siaddr)));
345
346 /* Gateway's ip address */
347 ND_TCHECK(bp->bp_giaddr);
348 if (EXTRACT_32BITS(&bp->bp_giaddr.s_addr))
349 ND_PRINT((ndo, "\n\t Gateway-IP %s", ipaddr_string(ndo, &bp->bp_giaddr)));
350
351 /* Client's Ethernet address */
352 if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
353 ND_TCHECK2(bp->bp_chaddr[0], 6);
354 ND_PRINT((ndo, "\n\t Client-Ethernet-Address %s", etheraddr_string(ndo, bp->bp_chaddr)));
355 }
356
357 ND_TCHECK2(bp->bp_sname[0], 1); /* check first char only */
358 if (*bp->bp_sname) {
359 ND_PRINT((ndo, "\n\t sname \""));
360 if (fn_printztn(ndo, bp->bp_sname, (u_int)sizeof bp->bp_sname,
361 ndo->ndo_snapend) == 0) {
362 ND_PRINT((ndo, "\""));
363 ND_PRINT((ndo, "%s", tstr + 1));
364 return;
365 }
366 ND_PRINT((ndo, "\""));
367 }
368 ND_TCHECK2(bp->bp_file[0], 1); /* check first char only */
369 if (*bp->bp_file) {
370 ND_PRINT((ndo, "\n\t file \""));
371 if (fn_printztn(ndo, bp->bp_file, (u_int)sizeof bp->bp_file,
372 ndo->ndo_snapend) == 0) {
373 ND_PRINT((ndo, "\""));
374 ND_PRINT((ndo, "%s", tstr + 1));
375 return;
376 }
377 ND_PRINT((ndo, "\""));
378 }
379
380 /* Decode the vendor buffer */
381 ND_TCHECK2(bp->bp_vend[0], 4);
382 if (memcmp((const char *)bp->bp_vend, vm_rfc1048,
383 sizeof(uint32_t)) == 0)
384 rfc1048_print(ndo, bp->bp_vend);
385 else if (memcmp((const char *)bp->bp_vend, vm_cmu,
386 sizeof(uint32_t)) == 0)
387 cmu_print(ndo, bp->bp_vend);
388 else {
389 uint32_t ul;
390
391 ND_TCHECK_32BITS(&bp->bp_vend);
392 ul = EXTRACT_32BITS(&bp->bp_vend);
393 if (ul != 0)
394 ND_PRINT((ndo, "\n\t Vendor-#0x%x", ul));
395 }
396
397 return;
398 trunc:
399 ND_PRINT((ndo, "%s", tstr));
400 }
401
402 /*
403 * The first character specifies the format to print:
404 * i - ip address (32 bits)
405 * p - ip address pairs (32 bits + 32 bits)
406 * l - long (32 bits)
407 * L - unsigned long (32 bits)
408 * s - short (16 bits)
409 * b - period-seperated decimal bytes (variable length)
410 * x - colon-seperated hex bytes (variable length)
411 * a - ascii string (variable length)
412 * B - on/off (8 bits)
413 * $ - special (explicit code to handle)
414 */
415 static const struct tok tag2str[] = {
416 /* RFC1048 tags */
417 { TAG_PAD, " PAD" },
418 { TAG_SUBNET_MASK, "iSubnet-Mask" }, /* subnet mask (RFC950) */
419 { TAG_TIME_OFFSET, "LTime-Zone" }, /* seconds from UTC */
420 { TAG_GATEWAY, "iDefault-Gateway" }, /* default gateway */
421 { TAG_TIME_SERVER, "iTime-Server" }, /* time servers (RFC868) */
422 { TAG_NAME_SERVER, "iIEN-Name-Server" }, /* IEN name servers (IEN116) */
423 { TAG_DOMAIN_SERVER, "iDomain-Name-Server" }, /* domain name (RFC1035) */
424 { TAG_LOG_SERVER, "iLOG" }, /* MIT log servers */
425 { TAG_COOKIE_SERVER, "iCS" }, /* cookie servers (RFC865) */
426 { TAG_LPR_SERVER, "iLPR-Server" }, /* lpr server (RFC1179) */
427 { TAG_IMPRESS_SERVER, "iIM" }, /* impress servers (Imagen) */
428 { TAG_RLP_SERVER, "iRL" }, /* resource location (RFC887) */
429 { TAG_HOSTNAME, "aHostname" }, /* ascii hostname */
430 { TAG_BOOTSIZE, "sBS" }, /* 512 byte blocks */
431 { TAG_END, " END" },
432 /* RFC1497 tags */
433 { TAG_DUMPPATH, "aDP" },
434 { TAG_DOMAINNAME, "aDomain-Name" },
435 { TAG_SWAP_SERVER, "iSS" },
436 { TAG_ROOTPATH, "aRP" },
437 { TAG_EXTPATH, "aEP" },
438 /* RFC2132 tags */
439 { TAG_IP_FORWARD, "BIPF" },
440 { TAG_NL_SRCRT, "BSRT" },
441 { TAG_PFILTERS, "pPF" },
442 { TAG_REASS_SIZE, "sRSZ" },
443 { TAG_DEF_TTL, "bTTL" },
444 { TAG_MTU_TIMEOUT, "lMTU-Timeout" },
445 { TAG_MTU_TABLE, "sMTU-Table" },
446 { TAG_INT_MTU, "sMTU" },
447 { TAG_LOCAL_SUBNETS, "BLSN" },
448 { TAG_BROAD_ADDR, "iBR" },
449 { TAG_DO_MASK_DISC, "BMD" },
450 { TAG_SUPPLY_MASK, "BMS" },
451 { TAG_DO_RDISC, "BRouter-Discovery" },
452 { TAG_RTR_SOL_ADDR, "iRSA" },
453 { TAG_STATIC_ROUTE, "pStatic-Route" },
454 { TAG_USE_TRAILERS, "BUT" },
455 { TAG_ARP_TIMEOUT, "lAT" },
456 { TAG_ETH_ENCAP, "BIE" },
457 { TAG_TCP_TTL, "bTT" },
458 { TAG_TCP_KEEPALIVE, "lKI" },
459 { TAG_KEEPALIVE_GO, "BKG" },
460 { TAG_NIS_DOMAIN, "aYD" },
461 { TAG_NIS_SERVERS, "iYS" },
462 { TAG_NTP_SERVERS, "iNTP" },
463 { TAG_VENDOR_OPTS, "bVendor-Option" },
464 { TAG_NETBIOS_NS, "iNetbios-Name-Server" },
465 { TAG_NETBIOS_DDS, "iWDD" },
466 { TAG_NETBIOS_NODE, "$Netbios-Node" },
467 { TAG_NETBIOS_SCOPE, "aNetbios-Scope" },
468 { TAG_XWIN_FS, "iXFS" },
469 { TAG_XWIN_DM, "iXDM" },
470 { TAG_NIS_P_DOMAIN, "sN+D" },
471 { TAG_NIS_P_SERVERS, "iN+S" },
472 { TAG_MOBILE_HOME, "iMH" },
473 { TAG_SMPT_SERVER, "iSMTP" },
474 { TAG_POP3_SERVER, "iPOP3" },
475 { TAG_NNTP_SERVER, "iNNTP" },
476 { TAG_WWW_SERVER, "iWWW" },
477 { TAG_FINGER_SERVER, "iFG" },
478 { TAG_IRC_SERVER, "iIRC" },
479 { TAG_STREETTALK_SRVR, "iSTS" },
480 { TAG_STREETTALK_STDA, "iSTDA" },
481 { TAG_REQUESTED_IP, "iRequested-IP" },
482 { TAG_IP_LEASE, "lLease-Time" },
483 { TAG_OPT_OVERLOAD, "$OO" },
484 { TAG_TFTP_SERVER, "aTFTP" },
485 { TAG_BOOTFILENAME, "aBF" },
486 { TAG_DHCP_MESSAGE, " DHCP-Message" },
487 { TAG_SERVER_ID, "iServer-ID" },
488 { TAG_PARM_REQUEST, "bParameter-Request" },
489 { TAG_MESSAGE, "aMSG" },
490 { TAG_MAX_MSG_SIZE, "sMSZ" },
491 { TAG_RENEWAL_TIME, "lRN" },
492 { TAG_REBIND_TIME, "lRB" },
493 { TAG_VENDOR_CLASS, "aVendor-Class" },
494 { TAG_CLIENT_ID, "$Client-ID" },
495 /* RFC 2485 */
496 { TAG_OPEN_GROUP_UAP, "aUAP" },
497 /* RFC 2563 */
498 { TAG_DISABLE_AUTOCONF, "BNOAUTO" },
499 /* RFC 2610 */
500 { TAG_SLP_DA, "bSLP-DA" }, /*"b" is a little wrong */
501 { TAG_SLP_SCOPE, "bSLP-SCOPE" }, /*"b" is a little wrong */
502 /* RFC 2937 */
503 { TAG_NS_SEARCH, "sNSSEARCH" }, /* XXX 's' */
504 /* RFC 3004 - The User Class Option for DHCP */
505 { TAG_USER_CLASS, "$User-Class" },
506 /* RFC 3011 */
507 { TAG_IP4_SUBNET_SELECT, "iSUBNET" },
508 /* RFC 3442 */
509 { TAG_CLASSLESS_STATIC_RT, "$Classless-Static-Route" },
510 { TAG_CLASSLESS_STA_RT_MS, "$Classless-Static-Route-Microsoft" },
511 /* RFC 5859 - TFTP Server Address Option for DHCPv4 */
512 { TAG_TFTP_SERVER_ADDRESS, "iTFTP-Server-Address" },
513 /* http://www.iana.org/assignments/bootp-dhcp-extensions/index.htm */
514 { TAG_SLP_NAMING_AUTH, "aSLP-NA" },
515 { TAG_CLIENT_FQDN, "$FQDN" },
516 { TAG_AGENT_CIRCUIT, "$Agent-Information" },
517 { TAG_AGENT_REMOTE, "bARMT" },
518 { TAG_AGENT_MASK, "bAMSK" },
519 { TAG_TZ_STRING, "aTZSTR" },
520 { TAG_FQDN_OPTION, "bFQDNS" }, /* XXX 'b' */
521 { TAG_AUTH, "bAUTH" }, /* XXX 'b' */
522 { TAG_VINES_SERVERS, "iVINES" },
523 { TAG_SERVER_RANK, "sRANK" },
524 { TAG_CLIENT_ARCH, "sARCH" },
525 { TAG_CLIENT_NDI, "bNDI" }, /* XXX 'b' */
526 { TAG_CLIENT_GUID, "bGUID" }, /* XXX 'b' */
527 { TAG_LDAP_URL, "aLDAP" },
528 { TAG_6OVER4, "i6o4" },
529 { TAG_TZ_PCODE, "aPOSIX-TZ" },
530 { TAG_TZ_TCODE, "aTZ-Name" },
531 { TAG_IPX_COMPAT, "bIPX" }, /* XXX 'b' */
532 { TAG_NETINFO_PARENT, "iNI" },
533 { TAG_NETINFO_PARENT_TAG, "aNITAG" },
534 { TAG_URL, "aURL" },
535 { TAG_FAILOVER, "bFAIL" }, /* XXX 'b' */
536 { TAG_MUDURL, "aMUD-URL" },
537 { 0, NULL }
538 };
539 /* 2-byte extended tags */
540 static const struct tok xtag2str[] = {
541 { 0, NULL }
542 };
543
544 /* DHCP "options overload" types */
545 static const struct tok oo2str[] = {
546 { 1, "file" },
547 { 2, "sname" },
548 { 3, "file+sname" },
549 { 0, NULL }
550 };
551
552 /* NETBIOS over TCP/IP node type options */
553 static const struct tok nbo2str[] = {
554 { 0x1, "b-node" },
555 { 0x2, "p-node" },
556 { 0x4, "m-node" },
557 { 0x8, "h-node" },
558 { 0, NULL }
559 };
560
561 /* ARP Hardware types, for Client-ID option */
562 static const struct tok arp2str[] = {
563 { 0x1, "ether" },
564 { 0x6, "ieee802" },
565 { 0x7, "arcnet" },
566 { 0xf, "frelay" },
567 { 0x17, "strip" },
568 { 0x18, "ieee1394" },
569 { 0, NULL }
570 };
571
572 static const struct tok dhcp_msg_values[] = {
573 { DHCPDISCOVER, "Discover" },
574 { DHCPOFFER, "Offer" },
575 { DHCPREQUEST, "Request" },
576 { DHCPDECLINE, "Decline" },
577 { DHCPACK, "ACK" },
578 { DHCPNAK, "NACK" },
579 { DHCPRELEASE, "Release" },
580 { DHCPINFORM, "Inform" },
581 { 0, NULL }
582 };
583
584 #define AGENT_SUBOPTION_CIRCUIT_ID 1 /* RFC 3046 */
585 #define AGENT_SUBOPTION_REMOTE_ID 2 /* RFC 3046 */
586 #define AGENT_SUBOPTION_SUBSCRIBER_ID 6 /* RFC 3993 */
587 static const struct tok agent_suboption_values[] = {
588 { AGENT_SUBOPTION_CIRCUIT_ID, "Circuit-ID" },
589 { AGENT_SUBOPTION_REMOTE_ID, "Remote-ID" },
590 { AGENT_SUBOPTION_SUBSCRIBER_ID, "Subscriber-ID" },
591 { 0, NULL }
592 };
593
594
595 static void
596 rfc1048_print(netdissect_options *ndo,
597 register const u_char *bp)
598 {
599 register uint16_t tag;
600 register u_int len;
601 register const char *cp;
602 register char c;
603 int first, idx;
604 uint32_t ul;
605 uint16_t us;
606 uint8_t uc, subopt, suboptlen;
607
608 ND_PRINT((ndo, "\n\t Vendor-rfc1048 Extensions"));
609
610 /* Step over magic cookie */
611 ND_PRINT((ndo, "\n\t Magic Cookie 0x%08x", EXTRACT_32BITS(bp)));
612 bp += sizeof(int32_t);
613
614 /* Loop while we there is a tag left in the buffer */
615 while (ND_TTEST2(*bp, 1)) {
616 tag = *bp++;
617 if (tag == TAG_PAD && ndo->ndo_vflag < 3)
618 continue;
619 if (tag == TAG_END && ndo->ndo_vflag < 3)
620 return;
621 if (tag == TAG_EXTENDED_OPTION) {
622 ND_TCHECK2(*(bp + 1), 2);
623 tag = EXTRACT_16BITS(bp + 1);
624 /* XXX we don't know yet if the IANA will
625 * preclude overlap of 1-byte and 2-byte spaces.
626 * If not, we need to offset tag after this step.
627 */
628 cp = tok2str(xtag2str, "?xT%u", tag);
629 } else
630 cp = tok2str(tag2str, "?T%u", tag);
631 c = *cp++;
632
633 if (tag == TAG_PAD || tag == TAG_END)
634 len = 0;
635 else {
636 /* Get the length; check for truncation */
637 ND_TCHECK2(*bp, 1);
638 len = *bp++;
639 }
640
641 ND_PRINT((ndo, "\n\t %s Option %u, length %u%s", cp, tag, len,
642 len > 0 ? ": " : ""));
643
644 if (tag == TAG_PAD && ndo->ndo_vflag > 2) {
645 u_int ntag = 1;
646 while (ND_TTEST2(*bp, 1) && *bp == TAG_PAD) {
647 bp++;
648 ntag++;
649 }
650 if (ntag > 1)
651 ND_PRINT((ndo, ", occurs %u", ntag));
652 }
653
654 if (!ND_TTEST2(*bp, len)) {
655 ND_PRINT((ndo, "[|rfc1048 %u]", len));
656 return;
657 }
658
659 if (tag == TAG_DHCP_MESSAGE && len == 1) {
660 uc = *bp++;
661 ND_PRINT((ndo, "%s", tok2str(dhcp_msg_values, "Unknown (%u)", uc)));
662 continue;
663 }
664
665 if (tag == TAG_PARM_REQUEST) {
666 idx = 0;
667 while (len-- > 0) {
668 uc = *bp++;
669 cp = tok2str(tag2str, "?Option %u", uc);
670 if (idx % 4 == 0)
671 ND_PRINT((ndo, "\n\t "));
672 else
673 ND_PRINT((ndo, ", "));
674 ND_PRINT((ndo, "%s", cp + 1));
675 idx++;
676 }
677 continue;
678 }
679
680 if (tag == TAG_EXTENDED_REQUEST) {
681 first = 1;
682 while (len > 1) {
683 len -= 2;
684 us = EXTRACT_16BITS(bp);
685 bp += 2;
686 cp = tok2str(xtag2str, "?xT%u", us);
687 if (!first)
688 ND_PRINT((ndo, "+"));
689 ND_PRINT((ndo, "%s", cp + 1));
690 first = 0;
691 }
692 continue;
693 }
694
695 /* Print data */
696 if (c == '?') {
697 /* Base default formats for unknown tags on data size */
698 if (len & 1)
699 c = 'b';
700 else if (len & 2)
701 c = 's';
702 else
703 c = 'l';
704 }
705 first = 1;
706 switch (c) {
707
708 case 'a':
709 /* ascii strings */
710 ND_PRINT((ndo, "\""));
711 if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
712 ND_PRINT((ndo, "\""));
713 goto trunc;
714 }
715 ND_PRINT((ndo, "\""));
716 bp += len;
717 len = 0;
718 break;
719
720 case 'i':
721 case 'l':
722 case 'L':
723 /* ip addresses/32-bit words */
724 while (len >= sizeof(ul)) {
725 if (!first)
726 ND_PRINT((ndo, ","));
727 ul = EXTRACT_32BITS(bp);
728 if (c == 'i') {
729 ul = htonl(ul);
730 ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ul)));
731 } else if (c == 'L')
732 ND_PRINT((ndo, "%d", ul));
733 else
734 ND_PRINT((ndo, "%u", ul));
735 bp += sizeof(ul);
736 len -= sizeof(ul);
737 first = 0;
738 }
739 break;
740
741 case 'p':
742 /* IP address pairs */
743 while (len >= 2*sizeof(ul)) {
744 if (!first)
745 ND_PRINT((ndo, ","));
746 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
747 ND_PRINT((ndo, "(%s:", ipaddr_string(ndo, &ul)));
748 bp += sizeof(ul);
749 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
750 ND_PRINT((ndo, "%s)", ipaddr_string(ndo, &ul)));
751 bp += sizeof(ul);
752 len -= 2*sizeof(ul);
753 first = 0;
754 }
755 break;
756
757 case 's':
758 /* shorts */
759 while (len >= sizeof(us)) {
760 if (!first)
761 ND_PRINT((ndo, ","));
762 us = EXTRACT_16BITS(bp);
763 ND_PRINT((ndo, "%u", us));
764 bp += sizeof(us);
765 len -= sizeof(us);
766 first = 0;
767 }
768 break;
769
770 case 'B':
771 /* boolean */
772 while (len > 0) {
773 if (!first)
774 ND_PRINT((ndo, ","));
775 switch (*bp) {
776 case 0:
777 ND_PRINT((ndo, "N"));
778 break;
779 case 1:
780 ND_PRINT((ndo, "Y"));
781 break;
782 default:
783 ND_PRINT((ndo, "%u?", *bp));
784 break;
785 }
786 ++bp;
787 --len;
788 first = 0;
789 }
790 break;
791
792 case 'b':
793 case 'x':
794 default:
795 /* Bytes */
796 while (len > 0) {
797 if (!first)
798 ND_PRINT((ndo, c == 'x' ? ":" : "."));
799 if (c == 'x')
800 ND_PRINT((ndo, "%02x", *bp));
801 else
802 ND_PRINT((ndo, "%u", *bp));
803 ++bp;
804 --len;
805 first = 0;
806 }
807 break;
808
809 case '$':
810 /* Guys we can't handle with one of the usual cases */
811 switch (tag) {
812
813 case TAG_NETBIOS_NODE:
814 /* this option should be at least 1 byte long */
815 if (len < 1) {
816 ND_PRINT((ndo, "ERROR: length < 1 bytes"));
817 break;
818 }
819 tag = *bp++;
820 --len;
821 ND_PRINT((ndo, "%s", tok2str(nbo2str, NULL, tag)));
822 break;
823
824 case TAG_OPT_OVERLOAD:
825 /* this option should be at least 1 byte long */
826 if (len < 1) {
827 ND_PRINT((ndo, "ERROR: length < 1 bytes"));
828 break;
829 }
830 tag = *bp++;
831 --len;
832 ND_PRINT((ndo, "%s", tok2str(oo2str, NULL, tag)));
833 break;
834
835 case TAG_CLIENT_FQDN:
836 /* this option should be at least 3 bytes long */
837 if (len < 3) {
838 ND_PRINT((ndo, "ERROR: length < 3 bytes"));
839 bp += len;
840 len = 0;
841 break;
842 }
843 if (*bp)
844 ND_PRINT((ndo, "[%s] ", client_fqdn_flags(*bp)));
845 bp++;
846 if (*bp || *(bp+1))
847 ND_PRINT((ndo, "%u/%u ", *bp, *(bp+1)));
848 bp += 2;
849 ND_PRINT((ndo, "\""));
850 if (fn_printn(ndo, bp, len - 3, ndo->ndo_snapend)) {
851 ND_PRINT((ndo, "\""));
852 goto trunc;
853 }
854 ND_PRINT((ndo, "\""));
855 bp += len - 3;
856 len = 0;
857 break;
858
859 case TAG_CLIENT_ID:
860 {
861 int type;
862
863 /* this option should be at least 1 byte long */
864 if (len < 1) {
865 ND_PRINT((ndo, "ERROR: length < 1 bytes"));
866 break;
867 }
868 type = *bp++;
869 len--;
870 if (type == 0) {
871 ND_PRINT((ndo, "\""));
872 if (fn_printn(ndo, bp, len, ndo->ndo_snapend)) {
873 ND_PRINT((ndo, "\""));
874 goto trunc;
875 }
876 ND_PRINT((ndo, "\""));
877 bp += len;
878 len = 0;
879 break;
880 } else {
881 ND_PRINT((ndo, "%s ", tok2str(arp2str, "hardware-type %u,", type)));
882 while (len > 0) {
883 if (!first)
884 ND_PRINT((ndo, ":"));
885 ND_PRINT((ndo, "%02x", *bp));
886 ++bp;
887 --len;
888 first = 0;
889 }
890 }
891 break;
892 }
893
894 case TAG_AGENT_CIRCUIT:
895 while (len >= 2) {
896 subopt = *bp++;
897 suboptlen = *bp++;
898 len -= 2;
899 if (suboptlen > len) {
900 ND_PRINT((ndo, "\n\t %s SubOption %u, length %u: length goes past end of option",
901 tok2str(agent_suboption_values, "Unknown", subopt),
902 subopt,
903 suboptlen));
904 bp += len;
905 len = 0;
906 break;
907 }
908 ND_PRINT((ndo, "\n\t %s SubOption %u, length %u: ",
909 tok2str(agent_suboption_values, "Unknown", subopt),
910 subopt,
911 suboptlen));
912 switch (subopt) {
913
914 case AGENT_SUBOPTION_CIRCUIT_ID: /* fall through */
915 case AGENT_SUBOPTION_REMOTE_ID:
916 case AGENT_SUBOPTION_SUBSCRIBER_ID:
917 if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend))
918 goto trunc;
919 break;
920
921 default:
922 print_unknown_data(ndo, bp, "\n\t\t", suboptlen);
923 }
924
925 len -= suboptlen;
926 bp += suboptlen;
927 }
928 break;
929
930 case TAG_CLASSLESS_STATIC_RT:
931 case TAG_CLASSLESS_STA_RT_MS:
932 {
933 u_int mask_width, significant_octets, i;
934
935 /* this option should be at least 5 bytes long */
936 if (len < 5) {
937 ND_PRINT((ndo, "ERROR: length < 5 bytes"));
938 bp += len;
939 len = 0;
940 break;
941 }
942 while (len > 0) {
943 if (!first)
944 ND_PRINT((ndo, ","));
945 mask_width = *bp++;
946 len--;
947 /* mask_width <= 32 */
948 if (mask_width > 32) {
949 ND_PRINT((ndo, "[ERROR: Mask width (%d) > 32]", mask_width));
950 bp += len;
951 len = 0;
952 break;
953 }
954 significant_octets = (mask_width + 7) / 8;
955 /* significant octets + router(4) */
956 if (len < significant_octets + 4) {
957 ND_PRINT((ndo, "[ERROR: Remaining length (%u) < %u bytes]", len, significant_octets + 4));
958 bp += len;
959 len = 0;
960 break;
961 }
962 ND_PRINT((ndo, "("));
963 if (mask_width == 0)
964 ND_PRINT((ndo, "default"));
965 else {
966 for (i = 0; i < significant_octets ; i++) {
967 if (i > 0)
968 ND_PRINT((ndo, "."));
969 ND_PRINT((ndo, "%d", *bp++));
970 }
971 for (i = significant_octets ; i < 4 ; i++)
972 ND_PRINT((ndo, ".0"));
973 ND_PRINT((ndo, "/%d", mask_width));
974 }
975 memcpy((char *)&ul, (const char *)bp, sizeof(ul));
976 ND_PRINT((ndo, ":%s)", ipaddr_string(ndo, &ul)));
977 bp += sizeof(ul);
978 len -= (significant_octets + 4);
979 first = 0;
980 }
981 break;
982 }
983
984 case TAG_USER_CLASS:
985 {
986 u_int suboptnumber = 1;
987
988 first = 1;
989 if (len < 2) {
990 ND_PRINT((ndo, "ERROR: length < 2 bytes"));
991 bp += len;
992 len = 0;
993 break;
994 }
995 while (len > 0) {
996 suboptlen = *bp++;
997 len--;
998 ND_PRINT((ndo, "\n\t "));
999 ND_PRINT((ndo, "instance#%u: ", suboptnumber));
1000 if (suboptlen == 0) {
1001 ND_PRINT((ndo, "ERROR: suboption length must be non-zero"));
1002 bp += len;
1003 len = 0;
1004 break;
1005 }
1006 if (len < suboptlen) {
1007 ND_PRINT((ndo, "ERROR: invalid option"));
1008 bp += len;
1009 len = 0;
1010 break;
1011 }
1012 ND_PRINT((ndo, "\""));
1013 if (fn_printn(ndo, bp, suboptlen, ndo->ndo_snapend)) {
1014 ND_PRINT((ndo, "\""));
1015 goto trunc;
1016 }
1017 ND_PRINT((ndo, "\""));
1018 ND_PRINT((ndo, ", length %d", suboptlen));
1019 suboptnumber++;
1020 len -= suboptlen;
1021 bp += suboptlen;
1022 }
1023 break;
1024 }
1025
1026 default:
1027 ND_PRINT((ndo, "[unknown special tag %u, size %u]",
1028 tag, len));
1029 bp += len;
1030 len = 0;
1031 break;
1032 }
1033 break;
1034 }
1035 /* Data left over? */
1036 if (len) {
1037 ND_PRINT((ndo, "\n\t trailing data length %u", len));
1038 bp += len;
1039 }
1040 }
1041 return;
1042 trunc:
1043 ND_PRINT((ndo, "|[rfc1048]"));
1044 }
1045
1046 static void
1047 cmu_print(netdissect_options *ndo,
1048 register const u_char *bp)
1049 {
1050 register const struct cmu_vend *cmu;
1051
1052 #define PRINTCMUADDR(m, s) { ND_TCHECK(cmu->m); \
1053 if (cmu->m.s_addr != 0) \
1054 ND_PRINT((ndo, " %s:%s", s, ipaddr_string(ndo, &cmu->m.s_addr))); }
1055
1056 ND_PRINT((ndo, " vend-cmu"));
1057 cmu = (const struct cmu_vend *)bp;
1058
1059 /* Only print if there are unknown bits */
1060 ND_TCHECK(cmu->v_flags);
1061 if ((cmu->v_flags & ~(VF_SMASK)) != 0)
1062 ND_PRINT((ndo, " F:0x%x", cmu->v_flags));
1063 PRINTCMUADDR(v_dgate, "DG");
1064 PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
1065 PRINTCMUADDR(v_dns1, "NS1");
1066 PRINTCMUADDR(v_dns2, "NS2");
1067 PRINTCMUADDR(v_ins1, "IEN1");
1068 PRINTCMUADDR(v_ins2, "IEN2");
1069 PRINTCMUADDR(v_ts1, "TS1");
1070 PRINTCMUADDR(v_ts2, "TS2");
1071 return;
1072
1073 trunc:
1074 ND_PRINT((ndo, "%s", tstr));
1075 #undef PRINTCMUADDR
1076 }
1077
1078 static char *
1079 client_fqdn_flags(u_int flags)
1080 {
1081 static char buf[8+1];
1082 int i = 0;
1083
1084 if (flags & CLIENT_FQDN_FLAGS_S)
1085 buf[i++] = 'S';
1086 if (flags & CLIENT_FQDN_FLAGS_O)
1087 buf[i++] = 'O';
1088 if (flags & CLIENT_FQDN_FLAGS_E)
1089 buf[i++] = 'E';
1090 if (flags & CLIENT_FQDN_FLAGS_N)
1091 buf[i++] = 'N';
1092 buf[i] = '\0';
1093
1094 return buf;
1095 }
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