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add tracefiles for infinite loop testing
[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 1.89.2.4 2004-07-13 16:00:25 hannes 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
446 if (pfunc == NULL) /* catch the above null pointer if unknown CP */
447 break;
448
449 if ((j = (*pfunc)(tptr, len)) == 0)
450 break;
451 x -= j;
452 tptr += j;
453 } while (x > 0);
454 break;
455
456 case CPCODES_TERM_REQ:
457 case CPCODES_TERM_ACK:
458 /* XXX: need to decode Data? */
459 break;
460 case CPCODES_CODE_REJ:
461 /* XXX: need to decode Rejected-Packet? */
462 break;
463 case CPCODES_PROT_REJ:
464 if (length < 6)
465 break;
466 TCHECK2(*tptr, 2);
467 printf(", Rejected %s Protocol (0x%04x)",
468 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
469 EXTRACT_16BITS(tptr));
470 /* XXX: need to decode Rejected-Information? */
471 break;
472 case CPCODES_ECHO_REQ:
473 case CPCODES_ECHO_RPL:
474 case CPCODES_DISC_REQ:
475 case CPCODES_ID:
476 if (length < 8)
477 break;
478 TCHECK2(*tptr, 4);
479 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
480 /* XXX: need to decode Data? */
481 break;
482 case CPCODES_TIME_REM:
483 if (length < 12)
484 break;
485 TCHECK2(*tptr, 4);
486 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
487 TCHECK2(*(tptr + 4), 4);
488 printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4));
489 /* XXX: need to decode Message? */
490 break;
491 default:
492 /* XXX this is dirty but we do not get the
493 * original pointer passed to the begin
494 * the PPP packet */
495 if (vflag <= 1)
496 print_unknown_data(pptr-2,"\n\t",length+2);
497 break;
498 }
499 printf(", length %u", length);
500
501 if (vflag >1)
502 print_unknown_data(pptr-2,"\n\t",length+2);
503 return;
504
505 trunc:
506 printf("[|%s]", typestr);
507 }
508
509 /* LCP config options */
510 static int
511 print_lcp_config_options(const u_char *p, int length)
512 {
513 int len, opt;
514
515 if (length < 2)
516 return 0;
517 TCHECK2(*p, 2);
518 len = p[1];
519 opt = p[0];
520 if (length < len)
521 return 0;
522 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
523 printf(", %s ", lcpconfopts[opt]);
524 else {
525 printf(", unknown LCP option 0x%02x", opt);
526 return len;
527 }
528
529 switch (opt) {
530 case LCPOPT_VEXT:
531 if (len >= 6) {
532 TCHECK2(*(p + 2), 3);
533 printf(" OUI 0x%06x", EXTRACT_24BITS(p+2));
534 #if 0
535 TCHECK(p[5]);
536 printf(" kind 0x%02x", p[5]);
537 printf(" val 0x")
538 for (i = 0; i < len - 6; i++) {
539 TCHECK(p[6 + i]);
540 printf("%02x", p[6 + i]);
541 }
542 #endif
543 }
544 break;
545 case LCPOPT_MRU:
546 if (len == 4) {
547 TCHECK2(*(p + 2), 2);
548 printf(" %u", EXTRACT_16BITS(p + 2));
549 }
550 break;
551 case LCPOPT_ACCM:
552 if (len == 6) {
553 TCHECK2(*(p + 2), 4);
554 printf(" %08x", EXTRACT_32BITS(p + 2));
555 }
556 break;
557 case LCPOPT_AP:
558 if (len >= 4) {
559 TCHECK2(*(p + 2), 2);
560 switch (EXTRACT_16BITS(p+2)) {
561 case PPP_PAP:
562 printf(" PAP");
563 break;
564 case PPP_CHAP:
565 printf(" CHAP");
566 TCHECK(p[4]);
567 switch (p[4]) {
568 default:
569 printf(", unknown-algorithm-%u", p[4]);
570 break;
571 case AUTHALG_CHAPMD5:
572 printf(", MD5");
573 break;
574 case AUTHALG_MSCHAP1:
575 printf(", MSCHAPv1");
576 break;
577 case AUTHALG_MSCHAP2:
578 printf(", MSCHAPv2");
579 break;
580 }
581 break;
582 case PPP_EAP:
583 printf(" EAP");
584 break;
585 case PPP_SPAP:
586 printf(" SPAP");
587 break;
588 case PPP_SPAP_OLD:
589 printf(" Old-SPAP");
590 break;
591 default:
592 printf("unknown");
593 }
594 }
595 break;
596 case LCPOPT_QP:
597 if (len >= 4) {
598 TCHECK2(*(p + 2), 2);
599 if (EXTRACT_16BITS(p+2) == PPP_LQM)
600 printf(" LQR");
601 else
602 printf(" unknown");
603 }
604 break;
605 case LCPOPT_MN:
606 if (len == 6) {
607 TCHECK2(*(p + 2), 4);
608 printf(" 0x%08x", EXTRACT_32BITS(p + 2));
609 }
610 break;
611 case LCPOPT_PFC:
612 break;
613 case LCPOPT_ACFC:
614 break;
615 case LCPOPT_LD:
616 if (len == 4) {
617 TCHECK2(*(p + 2), 2);
618 printf(" 0x%04x", EXTRACT_16BITS(p + 2));
619 }
620 break;
621 case LCPOPT_CBACK:
622 if (len < 3)
623 break;
624 TCHECK(p[2]);
625 switch (p[2]) { /* Operation */
626 case CALLBACK_AUTH:
627 printf(" UserAuth");
628 break;
629 case CALLBACK_DSTR:
630 printf(" DialString");
631 break;
632 case CALLBACK_LID:
633 printf(" LocalID");
634 break;
635 case CALLBACK_E164:
636 printf(" E.164");
637 break;
638 case CALLBACK_X500:
639 printf(" X.500");
640 break;
641 case CALLBACK_CBCP:
642 printf(" CBCP");
643 break;
644 default:
645 printf(" unknown-operation=%u", p[2]);
646 break;
647 }
648 break;
649 case LCPOPT_MLMRRU:
650 if (len == 4) {
651 TCHECK2(*(p + 2), 2);
652 printf(" %u", EXTRACT_16BITS(p + 2));
653 }
654 break;
655 case LCPOPT_MLED:
656 if (len < 3)
657 break;
658 TCHECK(p[2]);
659 switch (p[2]) { /* class */
660 case MEDCLASS_NULL:
661 printf(" Null");
662 break;
663 case MEDCLASS_LOCAL:
664 printf(" Local"); /* XXX */
665 break;
666 case MEDCLASS_IPV4:
667 if (len != 7)
668 break;
669 TCHECK2(*(p + 3), 4);
670 printf(" IPv4 %s", ipaddr_string(p + 3));
671 break;
672 case MEDCLASS_MAC:
673 if (len != 9)
674 break;
675 TCHECK(p[8]);
676 printf(" MAC %02x:%02x:%02x:%02x:%02x:%02x",
677 p[3], p[4], p[5], p[6], p[7], p[8]);
678 break;
679 case MEDCLASS_MNB:
680 printf(" Magic-Num-Block"); /* XXX */
681 break;
682 case MEDCLASS_PSNDN:
683 printf(" PSNDN"); /* XXX */
684 break;
685 }
686 break;
687
688 /* XXX: to be supported */
689 #if 0
690 case LCPOPT_DEP6:
691 case LCPOPT_FCSALT:
692 case LCPOPT_SDP:
693 case LCPOPT_NUMMODE:
694 case LCPOPT_DEP12:
695 case LCPOPT_DEP14:
696 case LCPOPT_DEP15:
697 case LCPOPT_DEP16:
698 case LCPOPT_MLSSNHF:
699 case LCPOPT_PROP:
700 case LCPOPT_DCEID:
701 case LCPOPT_MPP:
702 case LCPOPT_LCPAOPT:
703 case LCPOPT_COBS:
704 case LCPOPT_PE:
705 case LCPOPT_MLHF:
706 case LCPOPT_I18N:
707 case LCPOPT_SDLOS:
708 case LCPOPT_PPPMUX:
709 break;
710 #endif
711 }
712 return len;
713
714 trunc:
715 printf("[|lcp]");
716 return 0;
717 }
718
719 /* CHAP */
720 static void
721 handle_chap(const u_char *p, int length)
722 {
723 u_int code, len;
724 int val_size, name_size, msg_size;
725 const u_char *p0;
726 int i;
727
728 p0 = p;
729 if (length < 1) {
730 printf("[|chap]");
731 return;
732 } else if (length < 4) {
733 TCHECK(*p);
734 printf("[|chap 0x%02x]", *p);
735 return;
736 }
737
738 TCHECK(*p);
739 code = *p;
740 if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
741 printf("%s", chapcode[code - 1]);
742 else {
743 printf("0x%02x", code);
744 return;
745 }
746 p++;
747
748 TCHECK(*p);
749 printf("(%u)", *p); /* ID */
750 p++;
751
752 TCHECK2(*p, 2);
753 len = EXTRACT_16BITS(p);
754 p += 2;
755
756 /*
757 * Note that this is a generic CHAP decoding routine. Since we
758 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
759 * MS-CHAPv2) is used at this point, we can't decode packet
760 * specifically to each algorithms. Instead, we simply decode
761 * the GCD (Gratest Common Denominator) for all algorithms.
762 */
763 switch (code) {
764 case CHAP_CHAL:
765 case CHAP_RESP:
766 if (length - (p - p0) < 1)
767 return;
768 TCHECK(*p);
769 val_size = *p; /* value size */
770 p++;
771 if (length - (p - p0) < val_size)
772 return;
773 printf(", Value ");
774 for (i = 0; i < val_size; i++) {
775 TCHECK(*p);
776 printf("%02x", *p++);
777 }
778 name_size = len - (p - p0);
779 printf(", Name ");
780 for (i = 0; i < name_size; i++) {
781 TCHECK(*p);
782 safeputchar(*p++);
783 }
784 break;
785 case CHAP_SUCC:
786 case CHAP_FAIL:
787 msg_size = len - (p - p0);
788 printf(", Msg ");
789 for (i = 0; i< msg_size; i++) {
790 TCHECK(*p);
791 safeputchar(*p++);
792 }
793 break;
794 }
795 return;
796
797 trunc:
798 printf("[|chap]");
799 }
800
801 /* PAP (see RFC 1334) */
802 static void
803 handle_pap(const u_char *p, int length)
804 {
805 u_int code, len;
806 int peerid_len, passwd_len, msg_len;
807 const u_char *p0;
808 int i;
809
810 p0 = p;
811 if (length < 1) {
812 printf("[|pap]");
813 return;
814 } else if (length < 4) {
815 TCHECK(*p);
816 printf("[|pap 0x%02x]", *p);
817 return;
818 }
819
820 TCHECK(*p);
821 code = *p;
822 if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
823 printf("%s", papcode[code - 1]);
824 else {
825 printf("0x%02x", code);
826 return;
827 }
828 p++;
829
830 TCHECK(*p);
831 printf("(%u)", *p); /* ID */
832 p++;
833
834 TCHECK2(*p, 2);
835 len = EXTRACT_16BITS(p);
836 p += 2;
837
838 switch (code) {
839 case PAP_AREQ:
840 if (length - (p - p0) < 1)
841 return;
842 TCHECK(*p);
843 peerid_len = *p; /* Peer-ID Length */
844 p++;
845 if (length - (p - p0) < peerid_len)
846 return;
847 printf(", Peer ");
848 for (i = 0; i < peerid_len; i++) {
849 TCHECK(*p);
850 safeputchar(*p++);
851 }
852
853 if (length - (p - p0) < 1)
854 return;
855 TCHECK(*p);
856 passwd_len = *p; /* Password Length */
857 p++;
858 if (length - (p - p0) < passwd_len)
859 return;
860 printf(", Name ");
861 for (i = 0; i < passwd_len; i++) {
862 TCHECK(*p);
863 safeputchar(*p++);
864 }
865 break;
866 case PAP_AACK:
867 case PAP_ANAK:
868 if (length - (p - p0) < 1)
869 return;
870 TCHECK(*p);
871 msg_len = *p; /* Msg-Length */
872 p++;
873 if (length - (p - p0) < msg_len)
874 return;
875 printf(", Msg ");
876 for (i = 0; i< msg_len; i++) {
877 TCHECK(*p);
878 safeputchar(*p++);
879 }
880 break;
881 }
882 return;
883
884 trunc:
885 printf("[|pap]");
886 }
887
888 /* BAP */
889 static void
890 handle_bap(const u_char *p _U_, int length _U_)
891 {
892 /* XXX: to be supported!! */
893 }
894
895
896 /* IPCP config options */
897 static int
898 print_ipcp_config_options(const u_char *p, int length)
899 {
900 int len, opt;
901
902 if (length < 2)
903 return 0;
904 TCHECK2(*p, 2);
905 len = p[1];
906 opt = p[0];
907 if (length < len)
908 return 0;
909 switch (opt) {
910 case IPCPOPT_2ADDR: /* deprecated */
911 if (len != 10)
912 goto invlen;
913 TCHECK2(*(p + 6), 4);
914 printf(", IP-Addrs src %s, dst %s",
915 ipaddr_string(p + 2),
916 ipaddr_string(p + 6));
917 break;
918 case IPCPOPT_IPCOMP:
919 if (len < 4)
920 goto invlen;
921 printf(", IP-Comp");
922 TCHECK2(*(p + 2), 2);
923 if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
924 printf(" VJ-Comp");
925 /* XXX: VJ-Comp parameters should be decoded */
926 } else
927 printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
928 break;
929 case IPCPOPT_ADDR:
930 if (len != 6)
931 goto invlen;
932 TCHECK2(*(p + 2), 4);
933 printf(", IP-Addr %s", ipaddr_string(p + 2));
934 break;
935 case IPCPOPT_MOBILE4:
936 if (len != 6)
937 goto invlen;
938 TCHECK2(*(p + 2), 4);
939 printf(", Home-Addr %s", ipaddr_string(p + 2));
940 break;
941 case IPCPOPT_PRIDNS:
942 if (len != 6)
943 goto invlen;
944 TCHECK2(*(p + 2), 4);
945 printf(", Pri-DNS %s", ipaddr_string(p + 2));
946 break;
947 case IPCPOPT_PRINBNS:
948 if (len != 6)
949 goto invlen;
950 TCHECK2(*(p + 2), 4);
951 printf(", Pri-NBNS %s", ipaddr_string(p + 2));
952 break;
953 case IPCPOPT_SECDNS:
954 if (len != 6)
955 goto invlen;
956 TCHECK2(*(p + 2), 4);
957 printf(", Sec-DNS %s", ipaddr_string(p + 2));
958 break;
959 case IPCPOPT_SECNBNS:
960 if (len != 6)
961 goto invlen;
962 TCHECK2(*(p + 2), 4);
963 printf(", Sec-NBNS %s", ipaddr_string(p + 2));
964 break;
965 default:
966 printf(", unknown-%d", opt);
967 break;
968 }
969 return len;
970
971 invlen:
972 printf(", invalid-length-%d", opt);
973 return 0;
974
975 trunc:
976 printf("[|ipcp]");
977 return 0;
978 }
979
980 /* CCP config options */
981 static int
982 print_ccp_config_options(const u_char *p, int length)
983 {
984 int len, opt;
985
986 if (length < 2)
987 return 0;
988 TCHECK2(*p, 2);
989 len = p[1];
990 opt = p[0];
991 if (length < len)
992 return 0;
993 if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
994 printf(", %s", ccpconfopts[opt]);
995 #if 0 /* XXX */
996 switch (opt) {
997 case CCPOPT_OUI:
998 case CCPOPT_PRED1:
999 case CCPOPT_PRED2:
1000 case CCPOPT_PJUMP:
1001 case CCPOPT_HPPPC:
1002 case CCPOPT_STACLZS:
1003 case CCPOPT_MPPC:
1004 case CCPOPT_GFZA:
1005 case CCPOPT_V42BIS:
1006 case CCPOPT_BSDCOMP:
1007 case CCPOPT_LZSDCP:
1008 case CCPOPT_MVRCA:
1009 case CCPOPT_DEC:
1010 case CCPOPT_DEFLATE:
1011 case CCPOPT_RESV:
1012 break;
1013
1014 default:
1015 printf(", unknown-%d", opt);
1016 break;
1017 }
1018 #endif
1019 return len;
1020
1021 trunc:
1022 printf("[|ccp]");
1023 return 0;
1024 }
1025
1026 /* BACP config options */
1027 static int
1028 print_bacp_config_options(const u_char *p, int length)
1029 {
1030 int len, opt;
1031
1032 if (length < 2)
1033 return 0;
1034 TCHECK2(*p, 2);
1035 len = p[1];
1036 opt = p[0];
1037 if (length < len)
1038 return 0;
1039 if (opt == BACPOPT_FPEER) {
1040 TCHECK2(*(p + 2), 4);
1041 printf(", Favored-Peer");
1042 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
1043 } else {
1044 printf(", unknown-option-%d", opt);
1045 }
1046 return len;
1047
1048 trunc:
1049 printf("[|bacp]");
1050 return 0;
1051 }
1052
1053
1054 /* PPP */
1055 static void
1056 handle_ppp(u_int proto, const u_char *p, int length)
1057 {
1058 switch (proto) {
1059 case PPP_LCP:
1060 case PPP_IPCP:
1061 case PPP_OSICP:
1062 case PPP_MPLSCP:
1063 case PPP_IPV6CP:
1064 case PPP_CCP:
1065 case PPP_BACP:
1066 handle_ctrl_proto(proto, p, length);
1067 break;
1068 case PPP_CHAP:
1069 handle_chap(p, length);
1070 break;
1071 case PPP_PAP:
1072 handle_pap(p, length);
1073 break;
1074 case PPP_BAP: /* XXX: not yet completed */
1075 handle_bap(p, length);
1076 break;
1077 case ETHERTYPE_IP: /*XXX*/
1078 case PPP_IP:
1079 ip_print(p, length);
1080 break;
1081 #ifdef INET6
1082 case ETHERTYPE_IPV6: /*XXX*/
1083 case PPP_IPV6:
1084 ip6_print(p, length);
1085 break;
1086 #endif
1087 case ETHERTYPE_IPX: /*XXX*/
1088 case PPP_IPX:
1089 ipx_print(p, length);
1090 break;
1091 case PPP_OSI:
1092 isoclns_print(p, length, length);
1093 break;
1094 case PPP_MPLS_UCAST:
1095 case PPP_MPLS_MCAST:
1096 mpls_print(p, length);
1097 break;
1098 default:
1099 printf("unknown PPP protocol (0x%04x)", proto);
1100 print_unknown_data(p,"\n\t",length);
1101 break;
1102 }
1103 }
1104
1105 /* Standard PPP printer */
1106 u_int
1107 ppp_print(register const u_char *p, u_int length)
1108 {
1109 u_int proto;
1110 u_int olen = length; /* _o_riginal length */
1111 u_int hdr_len = 0;
1112
1113 /*
1114 * Here, we assume that p points to the Address and Control
1115 * field (if they present).
1116 */
1117 if (length < 2)
1118 goto trunc;
1119 TCHECK2(*p, 2);
1120 if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
1121 p += 2; /* ACFC not used */
1122 length -= 2;
1123 hdr_len += 2;
1124 }
1125
1126 if (length < 2)
1127 goto trunc;
1128 TCHECK(*p);
1129 if (*p % 2) {
1130 proto = *p; /* PFC is used */
1131 p++;
1132 length--;
1133 hdr_len++;
1134 } else {
1135 TCHECK2(*p, 2);
1136 proto = EXTRACT_16BITS(p);
1137 p += 2;
1138 length -= 2;
1139 hdr_len += 2;
1140 }
1141
1142 if (eflag)
1143 printf("PPP-%s (0x%04x), length %u: ",
1144 tok2str(ppptype2str, "unknown", proto),
1145 proto,
1146 olen);
1147
1148 handle_ppp(proto, p, length);
1149 return (hdr_len);
1150 trunc:
1151 printf("[|ppp]");
1152 return (0);
1153 }
1154
1155
1156 /* PPP I/F printer */
1157 u_int
1158 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1159 {
1160 register u_int length = h->len;
1161 register u_int caplen = h->caplen;
1162
1163 if (caplen < PPP_HDRLEN) {
1164 printf("[|ppp]");
1165 return (caplen);
1166 }
1167
1168 #if 0
1169 /*
1170 * XXX: seems to assume that there are 2 octets prepended to an
1171 * actual PPP frame. The 1st octet looks like Input/Output flag
1172 * while 2nd octet is unknown, at least to me
1173 * (mshindo@mshindo.net).
1174 *
1175 * That was what the original tcpdump code did.
1176 *
1177 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1178 * packets and 0 for inbound packets - but only if the
1179 * protocol field has the 0x8000 bit set (i.e., it's a network
1180 * control protocol); it does so before running the packet through
1181 * "bpf_filter" to see if it should be discarded, and to see
1182 * if we should update the time we sent the most recent packet...
1183 *
1184 * ...but it puts the original address field back after doing
1185 * so.
1186 *
1187 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1188 *
1189 * I don't know if any PPP implementation handed up to a BPF
1190 * device packets with the first octet being 1 for outbound and
1191 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1192 * whether that ever needs to be checked or not.
1193 *
1194 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1195 * and its tcpdump appears to assume that the frame always
1196 * begins with an address field and a control field, and that
1197 * the address field might be 0x0f or 0x8f, for Cisco
1198 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1199 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1200 * RFC 1662.
1201 *
1202 * (Is the Cisco framing in question what DLT_C_HDLC, in
1203 * BSD/OS, is?)
1204 */
1205 if (eflag)
1206 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
1207 #endif
1208
1209 ppp_print(p, length);
1210
1211 return (0);
1212 }
1213
1214 /*
1215 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1216 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1217 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1218 * discard them *if* those are the first two octets, and parse the remaining
1219 * packet as a PPP packet, as "ppp_print()" does).
1220 *
1221 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1222 */
1223 u_int
1224 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1225 {
1226 register u_int length = h->len;
1227 register u_int caplen = h->caplen;
1228 u_int proto;
1229 u_int hdrlen = 0;
1230
1231 if (caplen < 2) {
1232 printf("[|ppp]");
1233 return (caplen);
1234 }
1235
1236 switch (p[0]) {
1237
1238 case PPP_ADDRESS:
1239 if (caplen < 4) {
1240 printf("[|ppp]");
1241 return (caplen);
1242 }
1243
1244 if (eflag)
1245 printf("%02x %02x %d ", p[0], p[1], length);
1246 p += 2;
1247 length -= 2;
1248 hdrlen += 2;
1249
1250 proto = EXTRACT_16BITS(p);
1251 p += 2;
1252 length -= 2;
1253 hdrlen += 2;
1254 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1255
1256 handle_ppp(proto, p, length);
1257 break;
1258
1259 case CHDLC_UNICAST:
1260 case CHDLC_BCAST:
1261 return (chdlc_if_print(h, p));
1262
1263 default:
1264 if (eflag)
1265 printf("%02x %02x %d ", p[0], p[1], length);
1266 p += 2;
1267 length -= 2;
1268 hdrlen += 2;
1269
1270 /*
1271 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1272 * the next two octets as an Ethernet type; does that
1273 * ever happen?
1274 */
1275 printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
1276 break;
1277 }
1278
1279 return (hdrlen);
1280 }
1281
1282 #define PPP_BSDI_HDRLEN 24
1283
1284 /* BSD/OS specific PPP printer */
1285 u_int
1286 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1287 {
1288 register int hdrlength;
1289 #ifdef __bsdi__
1290 register u_int length = h->len;
1291 register u_int caplen = h->caplen;
1292 u_int16_t ptype;
1293 const u_char *q;
1294 int i;
1295
1296 if (caplen < PPP_BSDI_HDRLEN) {
1297 printf("[|ppp]");
1298 return (caplen)
1299 }
1300
1301 hdrlength = 0;
1302
1303 #if 0
1304 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1305 if (eflag)
1306 printf("%02x %02x ", p[0], p[1]);
1307 p += 2;
1308 hdrlength = 2;
1309 }
1310
1311 if (eflag)
1312 printf("%d ", length);
1313 /* Retrieve the protocol type */
1314 if (*p & 01) {
1315 /* Compressed protocol field */
1316 ptype = *p;
1317 if (eflag)
1318 printf("%02x ", ptype);
1319 p++;
1320 hdrlength += 1;
1321 } else {
1322 /* Un-compressed protocol field */
1323 ptype = ntohs(*(u_int16_t *)p);
1324 if (eflag)
1325 printf("%04x ", ptype);
1326 p += 2;
1327 hdrlength += 2;
1328 }
1329 #else
1330 ptype = 0; /*XXX*/
1331 if (eflag)
1332 printf("%c ", p[SLC_DIR] ? 'O' : 'I');
1333 if (p[SLC_LLHL]) {
1334 /* link level header */
1335 struct ppp_header *ph;
1336
1337 q = p + SLC_BPFHDRLEN;
1338 ph = (struct ppp_header *)q;
1339 if (ph->phdr_addr == PPP_ADDRESS
1340 && ph->phdr_ctl == PPP_CONTROL) {
1341 if (eflag)
1342 printf("%02x %02x ", q[0], q[1]);
1343 ptype = ntohs(ph->phdr_type);
1344 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1345 printf("%s ", tok2str(ppptype2str,
1346 "proto-#%d", ptype));
1347 }
1348 } else {
1349 if (eflag) {
1350 printf("LLH=[");
1351 for (i = 0; i < p[SLC_LLHL]; i++)
1352 printf("%02x", q[i]);
1353 printf("] ");
1354 }
1355 }
1356 }
1357 if (eflag)
1358 printf("%d ", length);
1359 if (p[SLC_CHL]) {
1360 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1361
1362 switch (ptype) {
1363 case PPP_VJC:
1364 ptype = vjc_print(q, ptype);
1365 hdrlength = PPP_BSDI_HDRLEN;
1366 p += hdrlength;
1367 switch (ptype) {
1368 case PPP_IP:
1369 ip_print(p, length);
1370 break;
1371 #ifdef INET6
1372 case PPP_IPV6:
1373 ip6_print(p, length);
1374 break;
1375 #endif
1376 case PPP_MPLS_UCAST:
1377 case PPP_MPLS_MCAST:
1378 mpls_print(p, length);
1379 break;
1380 }
1381 goto printx;
1382 case PPP_VJNC:
1383 ptype = vjc_print(q, ptype);
1384 hdrlength = PPP_BSDI_HDRLEN;
1385 p += hdrlength;
1386 switch (ptype) {
1387 case PPP_IP:
1388 ip_print(p, length);
1389 break;
1390 #ifdef INET6
1391 case PPP_IPV6:
1392 ip6_print(p, length);
1393 break;
1394 #endif
1395 case PPP_MPLS_UCAST:
1396 case PPP_MPLS_MCAST:
1397 mpls_print(p, length);
1398 break;
1399 }
1400 goto printx;
1401 default:
1402 if (eflag) {
1403 printf("CH=[");
1404 for (i = 0; i < p[SLC_LLHL]; i++)
1405 printf("%02x", q[i]);
1406 printf("] ");
1407 }
1408 break;
1409 }
1410 }
1411
1412 hdrlength = PPP_BSDI_HDRLEN;
1413 #endif
1414
1415 length -= hdrlength;
1416 p += hdrlength;
1417
1418 switch (ptype) {
1419 case PPP_IP:
1420 ip_print(p, length);
1421 break;
1422 #ifdef INET6
1423 case PPP_IPV6:
1424 ip6_print(p, length);
1425 break;
1426 #endif
1427 case PPP_MPLS_UCAST:
1428 case PPP_MPLS_MCAST:
1429 mpls_print(p, length);
1430 break;
1431 default:
1432 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1433 }
1434
1435 printx:
1436 #else /* __bsdi */
1437 hdrlength = 0;
1438 #endif /* __bsdi__ */
1439 return (hdrlength);
1440 }
[mirror] the TCPdump network dissector