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Add bounds checks.
[tcpdump] / print-ppp.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 * Extensively modified by Motonori Shindo (mshindo@mshindo.net) for more
22 * complete PPP support.
23 */
24
25 /*
26 * TODO:
27 * o resolve XXX as much as possible
28 * o MP support
29 * o BAP support
30 */
31
32 #ifndef lint
33 static const char rcsid[] _U_ =
34 "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.89.2.3 2004-03-24 03:32:43 guy Exp $ (LBL)";
35 #endif
36
37 #ifdef HAVE_CONFIG_H
38 #include "config.h"
39 #endif
40
41 #include <tcpdump-stdinc.h>
42
43 #ifdef __bsdi__
44 #include <net/slcompress.h>
45 #include <net/if_ppp.h>
46 #endif
47
48 #include <pcap.h>
49 #include <stdio.h>
50
51 #include "interface.h"
52 #include "extract.h"
53 #include "addrtoname.h"
54 #include "ppp.h"
55 #include "chdlc.h"
56 #include "ethertype.h"
57
58 /*
59 * The following constatns are defined by IANA. Please refer to
60 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
61 * for the up-to-date information.
62 */
63
64 /* Protocol Codes defined in ppp.h */
65
66 struct tok ppptype2str[] = {
67 { PPP_IP, "IP" },
68 { PPP_OSI, "OSI" },
69 { PPP_NS, "NS" },
70 { PPP_DECNET, "DECNET" },
71 { PPP_APPLE, "APPLE" },
72 { PPP_IPX, "IPX" },
73 { PPP_VJC, "VJC" },
74 { PPP_VJNC, "VJNC" },
75 { PPP_BRPDU, "BRPDU" },
76 { PPP_STII, "STII" },
77 { PPP_VINES, "VINES" },
78 { PPP_MPLS_UCAST, "MPLS" },
79 { PPP_MPLS_MCAST, "MPLS" },
80
81 { PPP_HELLO, "HELLO" },
82 { PPP_LUXCOM, "LUXCOM" },
83 { PPP_SNS, "SNS" },
84 { PPP_IPCP, "IPCP" },
85 { PPP_OSICP, "OSICP" },
86 { PPP_NSCP, "NSCP" },
87 { PPP_DECNETCP, "DECNETCP" },
88 { PPP_APPLECP, "APPLECP" },
89 { PPP_IPXCP, "IPXCP" },
90 { PPP_STIICP, "STIICP" },
91 { PPP_VINESCP, "VINESCP" },
92 { PPP_MPLSCP, "MPLSCP" },
93
94 { PPP_LCP, "LCP" },
95 { PPP_PAP, "PAP" },
96 { PPP_LQM, "LQM" },
97 { PPP_CHAP, "CHAP" },
98 { PPP_BACP, "BACP" },
99 { PPP_BAP, "BAP" },
100 { PPP_MP, "ML" },
101 { 0, NULL }
102 };
103
104 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */
105
106 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */
107 #define CPCODES_CONF_REQ 1 /* Configure-Request */
108 #define CPCODES_CONF_ACK 2 /* Configure-Ack */
109 #define CPCODES_CONF_NAK 3 /* Configure-Nak */
110 #define CPCODES_CONF_REJ 4 /* Configure-Reject */
111 #define CPCODES_TERM_REQ 5 /* Terminate-Request */
112 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */
113 #define CPCODES_CODE_REJ 7 /* Code-Reject */
114 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */
115 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */
116 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */
117 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */
118 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */
119 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */
120 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */
121 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */
122
123 struct tok cpcodes[] = {
124 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */
125 {CPCODES_CONF_REQ, "Conf-Request"},
126 {CPCODES_CONF_ACK, "Conf-Ack"},
127 {CPCODES_CONF_NAK, "Conf-Nack"},
128 {CPCODES_CONF_REJ, "Conf-Reject"},
129 {CPCODES_TERM_REQ, "Term-Request"},
130 {CPCODES_TERM_ACK, "Term-Ack"},
131 {CPCODES_CODE_REJ, "Code-Reject"},
132 {CPCODES_PROT_REJ, "Prot-Reject"},
133 {CPCODES_ECHO_REQ, "Echo-Request"},
134 {CPCODES_ECHO_RPL, "Echo-Reply"},
135 {CPCODES_DISC_REQ, "Disc-Req"},
136 {CPCODES_ID, "Ident"}, /* RFC1570 */
137 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */
138 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */
139 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */
140 {0, NULL}
141 };
142
143 /* LCP Config Options */
144
145 #define LCPOPT_VEXT 0
146 #define LCPOPT_MRU 1
147 #define LCPOPT_ACCM 2
148 #define LCPOPT_AP 3
149 #define LCPOPT_QP 4
150 #define LCPOPT_MN 5
151 #define LCPOPT_DEP6 6
152 #define LCPOPT_PFC 7
153 #define LCPOPT_ACFC 8
154 #define LCPOPT_FCSALT 9
155 #define LCPOPT_SDP 10
156 #define LCPOPT_NUMMODE 11
157 #define LCPOPT_DEP12 12
158 #define LCPOPT_CBACK 13
159 #define LCPOPT_DEP14 14
160 #define LCPOPT_DEP15 15
161 #define LCPOPT_DEP16 16
162 #define LCPOPT_MLMRRU 17
163 #define LCPOPT_MLSSNHF 18
164 #define LCPOPT_MLED 19
165 #define LCPOPT_PROP 20
166 #define LCPOPT_DCEID 21
167 #define LCPOPT_MPP 22
168 #define LCPOPT_LD 23
169 #define LCPOPT_LCPAOPT 24
170 #define LCPOPT_COBS 25
171 #define LCPOPT_PE 26
172 #define LCPOPT_MLHF 27
173 #define LCPOPT_I18N 28
174 #define LCPOPT_SDLOS 29
175 #define LCPOPT_PPPMUX 30
176
177 #define LCPOPT_MIN LCPOPT_VEXT
178 #define LCPOPT_MAX LCPOPT_PPPMUX
179
180 static const char *lcpconfopts[] = {
181 "Vend-Ext", /* (0) */
182 "MRU", /* (1) */
183 "ACCM", /* (2) */
184 "Auth-Prot", /* (3) */
185 "Qual-Prot", /* (4) */
186 "Magic-Num", /* (5) */
187 "deprecated(6)", /* used to be a Quality Protocol */
188 "PFC", /* (7) */
189 "ACFC", /* (8) */
190 "FCS-Alt", /* (9) */
191 "SDP", /* (10) */
192 "Num-Mode", /* (11) */
193 "deprecated(12)", /* used to be a Multi-Link-Procedure*/
194 "Call-Back", /* (13) */
195 "deprecated(14)", /* used to be a Connect-Time */
196 "deprecated(15)", /* used to be a Compund-Frames */
197 "deprecated(16)", /* used to be a Nominal-Data-Encap */
198 "MRRU", /* (17) */
199 "SSNHF", /* (18) */
200 "End-Disc", /* (19) */
201 "Proprietary", /* (20) */
202 "DCE-Id", /* (21) */
203 "MP+", /* (22) */
204 "Link-Disc", /* (23) */
205 "LCP-Auth-Opt", /* (24) */
206 "COBS", /* (25) */
207 "Prefix-elision", /* (26) */
208 "Multilink-header-Form",/* (27) */
209 "I18N", /* (28) */
210 "SDL-over-SONET/SDH", /* (29) */
211 "PPP-Muxing", /* (30) */
212 };
213
214 /* IPV6CP - to be supported */
215 /* ECP - to be supported */
216
217 /* CCP Config Options */
218
219 #define CCPOPT_OUI 0 /* RFC1962 */
220 #define CCPOPT_PRED1 1 /* RFC1962 */
221 #define CCPOPT_PRED2 2 /* RFC1962 */
222 #define CCPOPT_PJUMP 3 /* RFC1962 */
223 /* 4-15 unassigned */
224 #define CCPOPT_HPPPC 16 /* RFC1962 */
225 #define CCPOPT_STACLZS 17 /* RFC1974 */
226 #define CCPOPT_MPPC 18 /* RFC2118 */
227 #define CCPOPT_GFZA 19 /* RFC1962 */
228 #define CCPOPT_V42BIS 20 /* RFC1962 */
229 #define CCPOPT_BSDCOMP 21 /* RFC1977 */
230 /* 22 unassigned */
231 #define CCPOPT_LZSDCP 23 /* RFC1967 */
232 #define CCPOPT_MVRCA 24 /* RFC1975 */
233 #define CCPOPT_DEC 25 /* RFC1976 */
234 #define CCPOPT_DEFLATE 26 /* RFC1979 */
235 /* 27-254 unassigned */
236 #define CCPOPT_RESV 255 /* RFC1962 */
237
238 #define CCPOPT_MIN CCPOPT_OUI
239 #define CCPOPT_MAX CCPOPT_DEFLATE /* XXX: should be CCPOPT_RESV but... */
240
241 static const char *ccpconfopts[] = {
242 "OUI", /* (0) */
243 "Pred-1", /* (1) */
244 "Pred-2", /* (2) */
245 "Puddle", /* (3) */
246 "unassigned(4)", /* (4) */
247 "unassigned(5)", /* (5) */
248 "unassigned(6)", /* (6) */
249 "unassigned(7)", /* (7) */
250 "unassigned(8)", /* (8) */
251 "unassigned(9)", /* (9) */
252 "unassigned(10)", /* (10) */
253 "unassigned(11)", /* (11) */
254 "unassigned(12)", /* (12) */
255 "unassigned(13)", /* (13) */
256 "unassigned(14)", /* (14) */
257 "unassigned(15)", /* (15) */
258 "HP-PPC", /* (16) */
259 "Stac-LZS", /* (17) */
260 "MPPC", /* (18) */
261 "Gand-FZA", /* (19) */
262 "V.42bis", /* (20) */
263 "BSD-Comp", /* (21) */
264 "unassigned(22)", /* (22) */
265 "LZS-DCP", /* (23) */
266 "MVRCA", /* (24) */
267 "DEC", /* (25) */
268 "Deflate", /* (26) */
269 };
270
271 /* BACP Config Options */
272
273 #define BACPOPT_FPEER 1 /* RFC2125 */
274
275 /* SDCP - to be supported */
276
277 /* IPCP Config Options */
278
279 #define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */
280 #define IPCPOPT_IPCOMP 2 /* RFC1332 */
281 #define IPCPOPT_ADDR 3 /* RFC1332 */
282 #define IPCPOPT_MOBILE4 4 /* RFC2290 */
283
284 #define IPCPOPT_PRIDNS 129 /* RFC1877 */
285 #define IPCPOPT_PRINBNS 130 /* RFC1877 */
286 #define IPCPOPT_SECDNS 131 /* RFC1877 */
287 #define IPCPOPT_SECNBNS 132 /* RFC1877 */
288
289 /* ATCP - to be supported */
290 /* OSINLCP - to be supported */
291 /* BVCP - to be supported */
292 /* BCP - to be supported */
293 /* IPXCP - to be supported */
294 /* MPLSCP - to be supported */
295
296 /* Auth Algorithms */
297
298 /* 0-4 Reserved (RFC1994) */
299 #define AUTHALG_CHAPMD5 5 /* RFC1994 */
300 #define AUTHALG_MSCHAP1 128 /* RFC2433 */
301 #define AUTHALG_MSCHAP2 129 /* RFC2795 */
302
303 /* FCS Alternatives - to be supported */
304
305 /* Multilink Endpoint Discriminator (RFC1717) */
306 #define MEDCLASS_NULL 0 /* Null Class */
307 #define MEDCLASS_LOCAL 1 /* Locally Assigned */
308 #define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */
309 #define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */
310 #define MEDCLASS_MNB 4 /* PPP Magic Number Block */
311 #define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */
312
313 /* PPP LCP Callback */
314 #define CALLBACK_AUTH 0 /* Location determined by user auth */
315 #define CALLBACK_DSTR 1 /* Dialing string */
316 #define CALLBACK_LID 2 /* Location identifier */
317 #define CALLBACK_E164 3 /* E.164 number */
318 #define CALLBACK_X500 4 /* X.500 distinguished name */
319 #define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */
320
321 /* CHAP */
322
323 #define CHAP_CHAL 1
324 #define CHAP_RESP 2
325 #define CHAP_SUCC 3
326 #define CHAP_FAIL 4
327
328 #define CHAP_CODEMIN CHAP_CHAL
329 #define CHAP_CODEMAX CHAP_FAIL
330
331 static const char *chapcode[] = {
332 "Chal", /* (1) */
333 "Resp", /* (2) */
334 "Succ", /* (3) */
335 "Fail", /* (4) */
336 };
337
338 /* PAP */
339
340 #define PAP_AREQ 1
341 #define PAP_AACK 2
342 #define PAP_ANAK 3
343
344 #define PAP_CODEMIN PAP_AREQ
345 #define PAP_CODEMAX PAP_ANAK
346
347 static const char *papcode[] = {
348 "Auth-Req", /* (1) */
349 "Auth-Ack", /* (2) */
350 "Auth-Nak", /* (3) */
351 };
352
353 /* BAP */
354 #define BAP_CALLREQ 1
355 #define BAP_CALLRES 2
356 #define BAP_CBREQ 3
357 #define BAP_CBRES 4
358 #define BAP_LDQREQ 5
359 #define BAP_LDQRES 6
360 #define BAP_CSIND 7
361 #define BAP_CSRES 8
362
363 static void handle_ctrl_proto (u_int proto,const u_char *p, int length);
364 static void handle_chap (const u_char *p, int length);
365 static void handle_pap (const u_char *p, int length);
366 static void handle_bap (const u_char *p, int length);
367 static int print_lcp_config_options (const u_char *p, int);
368 static int print_ipcp_config_options (const u_char *p, int);
369 static int print_ccp_config_options (const u_char *p, int);
370 static int print_bacp_config_options (const u_char *p, int);
371 static void handle_ppp (u_int proto, const u_char *p, int length);
372
373 /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
374 static void
375 handle_ctrl_proto(u_int proto, const u_char *pptr, int length)
376 {
377 const char *typestr;
378 u_int code, len;
379 int (*pfunc)(const u_char *, int);
380 int x, j;
381 const u_char *tptr;
382
383 tptr=pptr;
384
385 typestr = tok2str(ppptype2str, "unknown", proto);
386 printf("%s, ",typestr);
387
388 if (length < 4) /* FIXME weak boundary checking */
389 goto trunc;
390 TCHECK2(*tptr, 2);
391
392 code = *tptr++;
393
394 printf("%s (0x%02x), id %u",
395 tok2str(cpcodes, "Unknown Opcode",code),
396 code,
397 *tptr++); /* ID */
398
399 TCHECK2(*tptr, 2);
400 len = EXTRACT_16BITS(tptr);
401 tptr += 2;
402
403 if (length <= 4)
404 return; /* there may be a NULL confreq etc. */
405
406 switch (code) {
407 case CPCODES_VEXT:
408 if (length < 11)
409 break;
410 TCHECK2(*tptr, 4);
411 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
412 tptr += 4;
413 TCHECK2(*tptr, 3);
414 printf(" OUI 0x%06x", EXTRACT_24BITS(tptr));
415 /* XXX: need to decode Kind and Value(s)? */
416 break;
417 case CPCODES_CONF_REQ:
418 case CPCODES_CONF_ACK:
419 case CPCODES_CONF_NAK:
420 case CPCODES_CONF_REJ:
421 x = len - 4; /* Code(1), Identifier(1) and Length(2) */
422 do {
423 switch (proto) {
424 case PPP_LCP:
425 pfunc = print_lcp_config_options;
426 break;
427 case PPP_IPCP:
428 pfunc = print_ipcp_config_options;
429 break;
430 case PPP_CCP:
431 pfunc = print_ccp_config_options;
432 break;
433 case PPP_BACP:
434 pfunc = print_bacp_config_options;
435 break;
436 default:
437 /*
438 * This should never happen, but we set
439 * "pfunc" to squelch uninitialized
440 * variable warnings from compilers.
441 */
442 pfunc = NULL;
443 break;
444 }
445 if ((j = (*pfunc)(tptr, len)) == 0)
446 break;
447 x -= j;
448 tptr += j;
449 } while (x > 0);
450 break;
451
452 case CPCODES_TERM_REQ:
453 case CPCODES_TERM_ACK:
454 /* XXX: need to decode Data? */
455 break;
456 case CPCODES_CODE_REJ:
457 /* XXX: need to decode Rejected-Packet? */
458 break;
459 case CPCODES_PROT_REJ:
460 if (length < 6)
461 break;
462 TCHECK2(*tptr, 2);
463 printf(", Rejected %s Protocol (0x%04x)",
464 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
465 EXTRACT_16BITS(tptr));
466 /* XXX: need to decode Rejected-Information? */
467 break;
468 case CPCODES_ECHO_REQ:
469 case CPCODES_ECHO_RPL:
470 case CPCODES_DISC_REQ:
471 case CPCODES_ID:
472 if (length < 8)
473 break;
474 TCHECK2(*tptr, 4);
475 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
476 /* XXX: need to decode Data? */
477 break;
478 case CPCODES_TIME_REM:
479 if (length < 12)
480 break;
481 TCHECK2(*tptr, 4);
482 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
483 TCHECK2(*(tptr + 4), 4);
484 printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4));
485 /* XXX: need to decode Message? */
486 break;
487 default:
488 /* XXX this is dirty but we do not get the
489 * original pointer passed to the begin
490 * the PPP packet */
491 if (vflag <= 1)
492 print_unknown_data(pptr-2,"\n\t",length+2);
493 break;
494 }
495 printf(", length %u", length);
496
497 if (vflag >1)
498 print_unknown_data(pptr-2,"\n\t",length+2);
499 return;
500
501 trunc:
502 printf("[|%s]", typestr);
503 }
504
505 /* LCP config options */
506 static int
507 print_lcp_config_options(const u_char *p, int length)
508 {
509 int len, opt;
510
511 if (length < 2)
512 return 0;
513 TCHECK2(*p, 2);
514 len = p[1];
515 opt = p[0];
516 if (length < len)
517 return 0;
518 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
519 printf(", %s ", lcpconfopts[opt]);
520 else {
521 printf(", unknown LCP option 0x%02x", opt);
522 return len;
523 }
524
525 switch (opt) {
526 case LCPOPT_VEXT:
527 if (len >= 6) {
528 TCHECK2(*(p + 2), 3);
529 printf(" OUI 0x%06x", EXTRACT_24BITS(p+2));
530 #if 0
531 TCHECK(p[5]);
532 printf(" kind 0x%02x", p[5]);
533 printf(" val 0x")
534 for (i = 0; i < len - 6; i++) {
535 TCHECK(p[6 + i]);
536 printf("%02x", p[6 + i]);
537 }
538 #endif
539 }
540 break;
541 case LCPOPT_MRU:
542 if (len == 4) {
543 TCHECK2(*(p + 2), 2);
544 printf(" %u", EXTRACT_16BITS(p + 2));
545 }
546 break;
547 case LCPOPT_ACCM:
548 if (len == 6) {
549 TCHECK2(*(p + 2), 4);
550 printf(" %08x", EXTRACT_32BITS(p + 2));
551 }
552 break;
553 case LCPOPT_AP:
554 if (len >= 4) {
555 TCHECK2(*(p + 2), 2);
556 switch (EXTRACT_16BITS(p+2)) {
557 case PPP_PAP:
558 printf(" PAP");
559 break;
560 case PPP_CHAP:
561 printf(" CHAP");
562 TCHECK(p[4]);
563 switch (p[4]) {
564 default:
565 printf(", unknown-algorithm-%u", p[4]);
566 break;
567 case AUTHALG_CHAPMD5:
568 printf(", MD5");
569 break;
570 case AUTHALG_MSCHAP1:
571 printf(", MSCHAPv1");
572 break;
573 case AUTHALG_MSCHAP2:
574 printf(", MSCHAPv2");
575 break;
576 }
577 break;
578 case PPP_EAP:
579 printf(" EAP");
580 break;
581 case PPP_SPAP:
582 printf(" SPAP");
583 break;
584 case PPP_SPAP_OLD:
585 printf(" Old-SPAP");
586 break;
587 default:
588 printf("unknown");
589 }
590 }
591 break;
592 case LCPOPT_QP:
593 if (len >= 4) {
594 TCHECK2(*(p + 2), 2);
595 if (EXTRACT_16BITS(p+2) == PPP_LQM)
596 printf(" LQR");
597 else
598 printf(" unknown");
599 }
600 break;
601 case LCPOPT_MN:
602 if (len == 6) {
603 TCHECK2(*(p + 2), 4);
604 printf(" 0x%08x", EXTRACT_32BITS(p + 2));
605 }
606 break;
607 case LCPOPT_PFC:
608 break;
609 case LCPOPT_ACFC:
610 break;
611 case LCPOPT_LD:
612 if (len == 4) {
613 TCHECK2(*(p + 2), 2);
614 printf(" 0x%04x", EXTRACT_16BITS(p + 2));
615 }
616 break;
617 case LCPOPT_CBACK:
618 if (len < 3)
619 break;
620 TCHECK(p[2]);
621 switch (p[2]) { /* Operation */
622 case CALLBACK_AUTH:
623 printf(" UserAuth");
624 break;
625 case CALLBACK_DSTR:
626 printf(" DialString");
627 break;
628 case CALLBACK_LID:
629 printf(" LocalID");
630 break;
631 case CALLBACK_E164:
632 printf(" E.164");
633 break;
634 case CALLBACK_X500:
635 printf(" X.500");
636 break;
637 case CALLBACK_CBCP:
638 printf(" CBCP");
639 break;
640 default:
641 printf(" unknown-operation=%u", p[2]);
642 break;
643 }
644 break;
645 case LCPOPT_MLMRRU:
646 if (len == 4) {
647 TCHECK2(*(p + 2), 2);
648 printf(" %u", EXTRACT_16BITS(p + 2));
649 }
650 break;
651 case LCPOPT_MLED:
652 if (len < 3)
653 break;
654 TCHECK(p[2]);
655 switch (p[2]) { /* class */
656 case MEDCLASS_NULL:
657 printf(" Null");
658 break;
659 case MEDCLASS_LOCAL:
660 printf(" Local"); /* XXX */
661 break;
662 case MEDCLASS_IPV4:
663 if (len != 7)
664 break;
665 TCHECK2(*(p + 3), 4);
666 printf(" IPv4 %s", ipaddr_string(p + 3));
667 break;
668 case MEDCLASS_MAC:
669 if (len != 9)
670 break;
671 TCHECK(p[8]);
672 printf(" MAC %02x:%02x:%02x:%02x:%02x:%02x",
673 p[3], p[4], p[5], p[6], p[7], p[8]);
674 break;
675 case MEDCLASS_MNB:
676 printf(" Magic-Num-Block"); /* XXX */
677 break;
678 case MEDCLASS_PSNDN:
679 printf(" PSNDN"); /* XXX */
680 break;
681 }
682 break;
683
684 /* XXX: to be supported */
685 #if 0
686 case LCPOPT_DEP6:
687 case LCPOPT_FCSALT:
688 case LCPOPT_SDP:
689 case LCPOPT_NUMMODE:
690 case LCPOPT_DEP12:
691 case LCPOPT_DEP14:
692 case LCPOPT_DEP15:
693 case LCPOPT_DEP16:
694 case LCPOPT_MLSSNHF:
695 case LCPOPT_PROP:
696 case LCPOPT_DCEID:
697 case LCPOPT_MPP:
698 case LCPOPT_LCPAOPT:
699 case LCPOPT_COBS:
700 case LCPOPT_PE:
701 case LCPOPT_MLHF:
702 case LCPOPT_I18N:
703 case LCPOPT_SDLOS:
704 case LCPOPT_PPPMUX:
705 break;
706 #endif
707 }
708 return len;
709
710 trunc:
711 printf("[|lcp]");
712 return 0;
713 }
714
715 /* CHAP */
716 static void
717 handle_chap(const u_char *p, int length)
718 {
719 u_int code, len;
720 int val_size, name_size, msg_size;
721 const u_char *p0;
722 int i;
723
724 p0 = p;
725 if (length < 1) {
726 printf("[|chap]");
727 return;
728 } else if (length < 4) {
729 TCHECK(*p);
730 printf("[|chap 0x%02x]", *p);
731 return;
732 }
733
734 TCHECK(*p);
735 code = *p;
736 if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
737 printf("%s", chapcode[code - 1]);
738 else {
739 printf("0x%02x", code);
740 return;
741 }
742 p++;
743
744 TCHECK(*p);
745 printf("(%u)", *p); /* ID */
746 p++;
747
748 TCHECK2(*p, 2);
749 len = EXTRACT_16BITS(p);
750 p += 2;
751
752 /*
753 * Note that this is a generic CHAP decoding routine. Since we
754 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
755 * MS-CHAPv2) is used at this point, we can't decode packet
756 * specifically to each algorithms. Instead, we simply decode
757 * the GCD (Gratest Common Denominator) for all algorithms.
758 */
759 switch (code) {
760 case CHAP_CHAL:
761 case CHAP_RESP:
762 if (length - (p - p0) < 1)
763 return;
764 TCHECK(*p);
765 val_size = *p; /* value size */
766 p++;
767 if (length - (p - p0) < val_size)
768 return;
769 printf(", Value ");
770 for (i = 0; i < val_size; i++) {
771 TCHECK(*p);
772 printf("%02x", *p++);
773 }
774 name_size = len - (p - p0);
775 printf(", Name ");
776 for (i = 0; i < name_size; i++) {
777 TCHECK(*p);
778 safeputchar(*p++);
779 }
780 break;
781 case CHAP_SUCC:
782 case CHAP_FAIL:
783 msg_size = len - (p - p0);
784 printf(", Msg ");
785 for (i = 0; i< msg_size; i++) {
786 TCHECK(*p);
787 safeputchar(*p++);
788 }
789 break;
790 }
791 return;
792
793 trunc:
794 printf("[|chap]");
795 }
796
797 /* PAP (see RFC 1334) */
798 static void
799 handle_pap(const u_char *p, int length)
800 {
801 u_int code, len;
802 int peerid_len, passwd_len, msg_len;
803 const u_char *p0;
804 int i;
805
806 p0 = p;
807 if (length < 1) {
808 printf("[|pap]");
809 return;
810 } else if (length < 4) {
811 TCHECK(*p);
812 printf("[|pap 0x%02x]", *p);
813 return;
814 }
815
816 TCHECK(*p);
817 code = *p;
818 if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
819 printf("%s", papcode[code - 1]);
820 else {
821 printf("0x%02x", code);
822 return;
823 }
824 p++;
825
826 TCHECK(*p);
827 printf("(%u)", *p); /* ID */
828 p++;
829
830 TCHECK2(*p, 2);
831 len = EXTRACT_16BITS(p);
832 p += 2;
833
834 switch (code) {
835 case PAP_AREQ:
836 if (length - (p - p0) < 1)
837 return;
838 TCHECK(*p);
839 peerid_len = *p; /* Peer-ID Length */
840 p++;
841 if (length - (p - p0) < peerid_len)
842 return;
843 printf(", Peer ");
844 for (i = 0; i < peerid_len; i++) {
845 TCHECK(*p);
846 safeputchar(*p++);
847 }
848
849 if (length - (p - p0) < 1)
850 return;
851 TCHECK(*p);
852 passwd_len = *p; /* Password Length */
853 p++;
854 if (length - (p - p0) < passwd_len)
855 return;
856 printf(", Name ");
857 for (i = 0; i < passwd_len; i++) {
858 TCHECK(*p);
859 safeputchar(*p++);
860 }
861 break;
862 case PAP_AACK:
863 case PAP_ANAK:
864 if (length - (p - p0) < 1)
865 return;
866 TCHECK(*p);
867 msg_len = *p; /* Msg-Length */
868 p++;
869 if (length - (p - p0) < msg_len)
870 return;
871 printf(", Msg ");
872 for (i = 0; i< msg_len; i++) {
873 TCHECK(*p);
874 safeputchar(*p++);
875 }
876 break;
877 }
878 return;
879
880 trunc:
881 printf("[|pap]");
882 }
883
884 /* BAP */
885 static void
886 handle_bap(const u_char *p _U_, int length _U_)
887 {
888 /* XXX: to be supported!! */
889 }
890
891
892 /* IPCP config options */
893 static int
894 print_ipcp_config_options(const u_char *p, int length)
895 {
896 int len, opt;
897
898 if (length < 2)
899 return 0;
900 TCHECK2(*p, 2);
901 len = p[1];
902 opt = p[0];
903 if (length < len)
904 return 0;
905 switch (opt) {
906 case IPCPOPT_2ADDR: /* deprecated */
907 if (len != 10)
908 goto invlen;
909 TCHECK2(*(p + 6), 4);
910 printf(", IP-Addrs src %s, dst %s",
911 ipaddr_string(p + 2),
912 ipaddr_string(p + 6));
913 break;
914 case IPCPOPT_IPCOMP:
915 if (len < 4)
916 goto invlen;
917 printf(", IP-Comp");
918 TCHECK2(*(p + 2), 2);
919 if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
920 printf(" VJ-Comp");
921 /* XXX: VJ-Comp parameters should be decoded */
922 } else
923 printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
924 break;
925 case IPCPOPT_ADDR:
926 if (len != 6)
927 goto invlen;
928 TCHECK2(*(p + 2), 4);
929 printf(", IP-Addr %s", ipaddr_string(p + 2));
930 break;
931 case IPCPOPT_MOBILE4:
932 if (len != 6)
933 goto invlen;
934 TCHECK2(*(p + 2), 4);
935 printf(", Home-Addr %s", ipaddr_string(p + 2));
936 break;
937 case IPCPOPT_PRIDNS:
938 if (len != 6)
939 goto invlen;
940 TCHECK2(*(p + 2), 4);
941 printf(", Pri-DNS %s", ipaddr_string(p + 2));
942 break;
943 case IPCPOPT_PRINBNS:
944 if (len != 6)
945 goto invlen;
946 TCHECK2(*(p + 2), 4);
947 printf(", Pri-NBNS %s", ipaddr_string(p + 2));
948 break;
949 case IPCPOPT_SECDNS:
950 if (len != 6)
951 goto invlen;
952 TCHECK2(*(p + 2), 4);
953 printf(", Sec-DNS %s", ipaddr_string(p + 2));
954 break;
955 case IPCPOPT_SECNBNS:
956 if (len != 6)
957 goto invlen;
958 TCHECK2(*(p + 2), 4);
959 printf(", Sec-NBNS %s", ipaddr_string(p + 2));
960 break;
961 default:
962 printf(", unknown-%d", opt);
963 break;
964 }
965 return len;
966
967 invlen:
968 printf(", invalid-length-%d", opt);
969 return 0;
970
971 trunc:
972 printf("[|ipcp]");
973 return 0;
974 }
975
976 /* CCP config options */
977 static int
978 print_ccp_config_options(const u_char *p, int length)
979 {
980 int len, opt;
981
982 if (length < 2)
983 return 0;
984 TCHECK2(*p, 2);
985 len = p[1];
986 opt = p[0];
987 if (length < len)
988 return 0;
989 if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
990 printf(", %s", ccpconfopts[opt]);
991 #if 0 /* XXX */
992 switch (opt) {
993 case CCPOPT_OUI:
994 case CCPOPT_PRED1:
995 case CCPOPT_PRED2:
996 case CCPOPT_PJUMP:
997 case CCPOPT_HPPPC:
998 case CCPOPT_STACLZS:
999 case CCPOPT_MPPC:
1000 case CCPOPT_GFZA:
1001 case CCPOPT_V42BIS:
1002 case CCPOPT_BSDCOMP:
1003 case CCPOPT_LZSDCP:
1004 case CCPOPT_MVRCA:
1005 case CCPOPT_DEC:
1006 case CCPOPT_DEFLATE:
1007 case CCPOPT_RESV:
1008 break;
1009
1010 default:
1011 printf(", unknown-%d", opt);
1012 break;
1013 }
1014 #endif
1015 return len;
1016
1017 trunc:
1018 printf("[|ccp]");
1019 return 0;
1020 }
1021
1022 /* BACP config options */
1023 static int
1024 print_bacp_config_options(const u_char *p, int length)
1025 {
1026 int len, opt;
1027
1028 if (length < 2)
1029 return 0;
1030 TCHECK2(*p, 2);
1031 len = p[1];
1032 opt = p[0];
1033 if (length < len)
1034 return 0;
1035 if (opt == BACPOPT_FPEER) {
1036 TCHECK2(*(p + 2), 4);
1037 printf(", Favored-Peer");
1038 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
1039 } else {
1040 printf(", unknown-option-%d", opt);
1041 }
1042 return len;
1043
1044 trunc:
1045 printf("[|bacp]");
1046 return 0;
1047 }
1048
1049
1050 /* PPP */
1051 static void
1052 handle_ppp(u_int proto, const u_char *p, int length)
1053 {
1054 switch (proto) {
1055 case PPP_LCP:
1056 case PPP_IPCP:
1057 case PPP_OSICP:
1058 case PPP_MPLSCP:
1059 case PPP_IPV6CP:
1060 case PPP_CCP:
1061 case PPP_BACP:
1062 handle_ctrl_proto(proto, p, length);
1063 break;
1064 case PPP_CHAP:
1065 handle_chap(p, length);
1066 break;
1067 case PPP_PAP:
1068 handle_pap(p, length);
1069 break;
1070 case PPP_BAP: /* XXX: not yet completed */
1071 handle_bap(p, length);
1072 break;
1073 case ETHERTYPE_IP: /*XXX*/
1074 case PPP_IP:
1075 ip_print(p, length);
1076 break;
1077 #ifdef INET6
1078 case ETHERTYPE_IPV6: /*XXX*/
1079 case PPP_IPV6:
1080 ip6_print(p, length);
1081 break;
1082 #endif
1083 case ETHERTYPE_IPX: /*XXX*/
1084 case PPP_IPX:
1085 ipx_print(p, length);
1086 break;
1087 case PPP_OSI:
1088 isoclns_print(p, length, length);
1089 break;
1090 case PPP_MPLS_UCAST:
1091 case PPP_MPLS_MCAST:
1092 mpls_print(p, length);
1093 break;
1094 default:
1095 printf("unknown PPP protocol (0x%04x)", proto);
1096 print_unknown_data(p,"\n\t",length);
1097 break;
1098 }
1099 }
1100
1101 /* Standard PPP printer */
1102 u_int
1103 ppp_print(register const u_char *p, u_int length)
1104 {
1105 u_int proto;
1106 u_int olen = length; /* _o_riginal length */
1107 u_int hdr_len = 0;
1108
1109 /*
1110 * Here, we assume that p points to the Address and Control
1111 * field (if they present).
1112 */
1113 if (length < 2)
1114 goto trunc;
1115 TCHECK2(*p, 2);
1116 if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
1117 p += 2; /* ACFC not used */
1118 length -= 2;
1119 hdr_len += 2;
1120 }
1121
1122 if (length < 2)
1123 goto trunc;
1124 TCHECK(*p);
1125 if (*p % 2) {
1126 proto = *p; /* PFC is used */
1127 p++;
1128 length--;
1129 hdr_len++;
1130 } else {
1131 TCHECK2(*p, 2);
1132 proto = EXTRACT_16BITS(p);
1133 p += 2;
1134 length -= 2;
1135 hdr_len += 2;
1136 }
1137
1138 if (eflag)
1139 printf("PPP-%s (0x%04x), length %u: ",
1140 tok2str(ppptype2str, "unknown", proto),
1141 proto,
1142 olen);
1143
1144 handle_ppp(proto, p, length);
1145 return (hdr_len);
1146 trunc:
1147 printf("[|ppp]");
1148 return (0);
1149 }
1150
1151
1152 /* PPP I/F printer */
1153 u_int
1154 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1155 {
1156 register u_int length = h->len;
1157 register u_int caplen = h->caplen;
1158
1159 if (caplen < PPP_HDRLEN) {
1160 printf("[|ppp]");
1161 return (caplen);
1162 }
1163
1164 #if 0
1165 /*
1166 * XXX: seems to assume that there are 2 octets prepended to an
1167 * actual PPP frame. The 1st octet looks like Input/Output flag
1168 * while 2nd octet is unknown, at least to me
1169 * (mshindo@mshindo.net).
1170 *
1171 * That was what the original tcpdump code did.
1172 *
1173 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1174 * packets and 0 for inbound packets - but only if the
1175 * protocol field has the 0x8000 bit set (i.e., it's a network
1176 * control protocol); it does so before running the packet through
1177 * "bpf_filter" to see if it should be discarded, and to see
1178 * if we should update the time we sent the most recent packet...
1179 *
1180 * ...but it puts the original address field back after doing
1181 * so.
1182 *
1183 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1184 *
1185 * I don't know if any PPP implementation handed up to a BPF
1186 * device packets with the first octet being 1 for outbound and
1187 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1188 * whether that ever needs to be checked or not.
1189 *
1190 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1191 * and its tcpdump appears to assume that the frame always
1192 * begins with an address field and a control field, and that
1193 * the address field might be 0x0f or 0x8f, for Cisco
1194 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1195 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1196 * RFC 1662.
1197 *
1198 * (Is the Cisco framing in question what DLT_C_HDLC, in
1199 * BSD/OS, is?)
1200 */
1201 if (eflag)
1202 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
1203 #endif
1204
1205 ppp_print(p, length);
1206
1207 return (0);
1208 }
1209
1210 /*
1211 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1212 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1213 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1214 * discard them *if* those are the first two octets, and parse the remaining
1215 * packet as a PPP packet, as "ppp_print()" does).
1216 *
1217 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1218 */
1219 u_int
1220 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1221 {
1222 register u_int length = h->len;
1223 register u_int caplen = h->caplen;
1224 u_int proto;
1225 u_int hdrlen = 0;
1226
1227 if (caplen < 2) {
1228 printf("[|ppp]");
1229 return (caplen);
1230 }
1231
1232 switch (p[0]) {
1233
1234 case PPP_ADDRESS:
1235 if (caplen < 4) {
1236 printf("[|ppp]");
1237 return (caplen);
1238 }
1239
1240 if (eflag)
1241 printf("%02x %02x %d ", p[0], p[1], length);
1242 p += 2;
1243 length -= 2;
1244 hdrlen += 2;
1245
1246 proto = EXTRACT_16BITS(p);
1247 p += 2;
1248 length -= 2;
1249 hdrlen += 2;
1250 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1251
1252 handle_ppp(proto, p, length);
1253 break;
1254
1255 case CHDLC_UNICAST:
1256 case CHDLC_BCAST:
1257 return (chdlc_if_print(h, p));
1258
1259 default:
1260 if (eflag)
1261 printf("%02x %02x %d ", p[0], p[1], length);
1262 p += 2;
1263 length -= 2;
1264 hdrlen += 2;
1265
1266 /*
1267 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1268 * the next two octets as an Ethernet type; does that
1269 * ever happen?
1270 */
1271 printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
1272 break;
1273 }
1274
1275 return (hdrlen);
1276 }
1277
1278 #define PPP_BSDI_HDRLEN 24
1279
1280 /* BSD/OS specific PPP printer */
1281 u_int
1282 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1283 {
1284 register int hdrlength;
1285 #ifdef __bsdi__
1286 register u_int length = h->len;
1287 register u_int caplen = h->caplen;
1288 u_int16_t ptype;
1289 const u_char *q;
1290 int i;
1291
1292 if (caplen < PPP_BSDI_HDRLEN) {
1293 printf("[|ppp]");
1294 return (caplen)
1295 }
1296
1297 hdrlength = 0;
1298
1299 #if 0
1300 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1301 if (eflag)
1302 printf("%02x %02x ", p[0], p[1]);
1303 p += 2;
1304 hdrlength = 2;
1305 }
1306
1307 if (eflag)
1308 printf("%d ", length);
1309 /* Retrieve the protocol type */
1310 if (*p & 01) {
1311 /* Compressed protocol field */
1312 ptype = *p;
1313 if (eflag)
1314 printf("%02x ", ptype);
1315 p++;
1316 hdrlength += 1;
1317 } else {
1318 /* Un-compressed protocol field */
1319 ptype = ntohs(*(u_int16_t *)p);
1320 if (eflag)
1321 printf("%04x ", ptype);
1322 p += 2;
1323 hdrlength += 2;
1324 }
1325 #else
1326 ptype = 0; /*XXX*/
1327 if (eflag)
1328 printf("%c ", p[SLC_DIR] ? 'O' : 'I');
1329 if (p[SLC_LLHL]) {
1330 /* link level header */
1331 struct ppp_header *ph;
1332
1333 q = p + SLC_BPFHDRLEN;
1334 ph = (struct ppp_header *)q;
1335 if (ph->phdr_addr == PPP_ADDRESS
1336 && ph->phdr_ctl == PPP_CONTROL) {
1337 if (eflag)
1338 printf("%02x %02x ", q[0], q[1]);
1339 ptype = ntohs(ph->phdr_type);
1340 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1341 printf("%s ", tok2str(ppptype2str,
1342 "proto-#%d", ptype));
1343 }
1344 } else {
1345 if (eflag) {
1346 printf("LLH=[");
1347 for (i = 0; i < p[SLC_LLHL]; i++)
1348 printf("%02x", q[i]);
1349 printf("] ");
1350 }
1351 }
1352 }
1353 if (eflag)
1354 printf("%d ", length);
1355 if (p[SLC_CHL]) {
1356 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1357
1358 switch (ptype) {
1359 case PPP_VJC:
1360 ptype = vjc_print(q, ptype);
1361 hdrlength = PPP_BSDI_HDRLEN;
1362 p += hdrlength;
1363 switch (ptype) {
1364 case PPP_IP:
1365 ip_print(p, length);
1366 break;
1367 #ifdef INET6
1368 case PPP_IPV6:
1369 ip6_print(p, length);
1370 break;
1371 #endif
1372 case PPP_MPLS_UCAST:
1373 case PPP_MPLS_MCAST:
1374 mpls_print(p, length);
1375 break;
1376 }
1377 goto printx;
1378 case PPP_VJNC:
1379 ptype = vjc_print(q, ptype);
1380 hdrlength = PPP_BSDI_HDRLEN;
1381 p += hdrlength;
1382 switch (ptype) {
1383 case PPP_IP:
1384 ip_print(p, length);
1385 break;
1386 #ifdef INET6
1387 case PPP_IPV6:
1388 ip6_print(p, length);
1389 break;
1390 #endif
1391 case PPP_MPLS_UCAST:
1392 case PPP_MPLS_MCAST:
1393 mpls_print(p, length);
1394 break;
1395 }
1396 goto printx;
1397 default:
1398 if (eflag) {
1399 printf("CH=[");
1400 for (i = 0; i < p[SLC_LLHL]; i++)
1401 printf("%02x", q[i]);
1402 printf("] ");
1403 }
1404 break;
1405 }
1406 }
1407
1408 hdrlength = PPP_BSDI_HDRLEN;
1409 #endif
1410
1411 length -= hdrlength;
1412 p += hdrlength;
1413
1414 switch (ptype) {
1415 case PPP_IP:
1416 ip_print(p, length);
1417 break;
1418 #ifdef INET6
1419 case PPP_IPV6:
1420 ip6_print(p, length);
1421 break;
1422 #endif
1423 case PPP_MPLS_UCAST:
1424 case PPP_MPLS_MCAST:
1425 mpls_print(p, length);
1426 break;
1427 default:
1428 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1429 }
1430
1431 printx:
1432 #else /* __bsdi */
1433 hdrlength = 0;
1434 #endif /* __bsdi__ */
1435 return (hdrlength);
1436 }
[mirror] the TCPdump network dissector