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