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Add support for Apple's IP-over-IEEE 1394 encapsulation.
[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 1.89.2.2 2003-11-16 08:51:39 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 u_int code, len;
378 int (*pfunc)(const u_char *, int);
379 int x, j;
380 const u_char *tptr;
381
382 tptr=pptr;
383
384 printf("%s, ",tok2str(ppptype2str, "unknown", proto));
385
386 if (length < 4) /* FIXME weak boundary checking */
387 return;
388
389 code = *tptr++;
390
391 printf("%s (0x%02x), id %u",
392 tok2str(cpcodes, "Unknown Opcode",code),
393 code,
394 *tptr++); /* ID */
395
396 len = EXTRACT_16BITS(tptr);
397 tptr += 2;
398
399 if (length <= 4)
400 return; /* there may be a NULL confreq etc. */
401
402 switch (code) {
403 case CPCODES_VEXT:
404 if (length < 11)
405 break;
406 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
407 tptr += 4;
408 printf(" OUI 0x%06x", EXTRACT_24BITS(tptr));
409 /* XXX: need to decode Kind and Value(s)? */
410 break;
411 case CPCODES_CONF_REQ:
412 case CPCODES_CONF_ACK:
413 case CPCODES_CONF_NAK:
414 case CPCODES_CONF_REJ:
415 x = len - 4; /* Code(1), Identifier(1) and Length(2) */
416 do {
417 switch (proto) {
418 case PPP_LCP:
419 pfunc = print_lcp_config_options;
420 break;
421 case PPP_IPCP:
422 pfunc = print_ipcp_config_options;
423 break;
424 case PPP_CCP:
425 pfunc = print_ccp_config_options;
426 break;
427 case PPP_BACP:
428 pfunc = print_bacp_config_options;
429 break;
430 default:
431 /*
432 * This should never happen, but we set
433 * "pfunc" to squelch uninitialized
434 * variable warnings from compilers.
435 */
436 pfunc = NULL;
437 break;
438 }
439 if ((j = (*pfunc)(tptr, len)) == 0)
440 break;
441 x -= j;
442 tptr += j;
443 } while (x > 0);
444 break;
445
446 case CPCODES_TERM_REQ:
447 case CPCODES_TERM_ACK:
448 /* XXX: need to decode Data? */
449 break;
450 case CPCODES_CODE_REJ:
451 /* XXX: need to decode Rejected-Packet? */
452 break;
453 case CPCODES_PROT_REJ:
454 if (length < 6)
455 break;
456 printf(", Rejected %s Protocol (0x%04x)",
457 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
458 EXTRACT_16BITS(tptr));
459 /* XXX: need to decode Rejected-Information? */
460 break;
461 case CPCODES_ECHO_REQ:
462 case CPCODES_ECHO_RPL:
463 case CPCODES_DISC_REQ:
464 case CPCODES_ID:
465 if (length < 8)
466 break;
467 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
468 /* XXX: need to decode Data? */
469 break;
470 case CPCODES_TIME_REM:
471 if (length < 12)
472 break;
473 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
474 printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4));
475 /* XXX: need to decode Message? */
476 break;
477 default:
478 /* XXX this is dirty but we do not get the
479 * original pointer passed to the begin
480 * the PPP packet */
481 if (vflag <= 1)
482 print_unknown_data(pptr-2,"\n\t",length+2);
483 break;
484 }
485 printf(", length %u", length);
486
487 if (vflag >1)
488 print_unknown_data(pptr-2,"\n\t",length+2);
489 }
490
491 /* LCP config options */
492 static int
493 print_lcp_config_options(const u_char *p, int length)
494 {
495 int len, opt;
496
497 if (length < 2)
498 return 0;
499 len = p[1];
500 opt = p[0];
501 if (length < len)
502 return 0;
503 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
504 printf(", %s ", lcpconfopts[opt]);
505 else {
506 printf(", unknown LCP option 0x%02x", opt);
507 return len;
508 }
509
510 switch (opt) {
511 case LCPOPT_VEXT:
512 if (len >= 6) {
513 printf(" OUI 0x%06x", EXTRACT_24BITS(p+2));
514 #if 0
515 printf(" kind 0x%02x", p[5]);
516 printf(" val 0x")
517 for (i = 0; i < len - 6; i++) {
518 printf("%02x", p[6 + i]);
519 }
520 #endif
521 }
522 break;
523 case LCPOPT_MRU:
524 if (len == 4)
525 printf(" %u", EXTRACT_16BITS(p + 2));
526 break;
527 case LCPOPT_ACCM:
528 if (len == 6)
529 printf(" %08x", EXTRACT_32BITS(p + 2));
530 break;
531 case LCPOPT_AP:
532 if (len >= 4) {
533 switch (EXTRACT_16BITS(p+2)) {
534 case PPP_PAP:
535 printf(" PAP");
536 break;
537 case PPP_CHAP:
538 printf(" CHAP");
539 switch (p[4]) {
540 default:
541 printf(", unknown-algorithm-%u", p[4]);
542 break;
543 case AUTHALG_CHAPMD5:
544 printf(", MD5");
545 break;
546 case AUTHALG_MSCHAP1:
547 printf(", MSCHAPv1");
548 break;
549 case AUTHALG_MSCHAP2:
550 printf(", MSCHAPv2");
551 break;
552 }
553 break;
554 case PPP_EAP:
555 printf(" EAP");
556 break;
557 case PPP_SPAP:
558 printf(" SPAP");
559 break;
560 case PPP_SPAP_OLD:
561 printf(" Old-SPAP");
562 break;
563 default:
564 printf("unknown");
565 }
566 }
567 break;
568 case LCPOPT_QP:
569 if (len >= 4) {
570 if (EXTRACT_16BITS(p+2) == PPP_LQM)
571 printf(" LQR");
572 else
573 printf(" unknown");
574 }
575 break;
576 case LCPOPT_MN:
577 if (len == 6)
578 printf(" 0x%08x", EXTRACT_32BITS(p + 2));
579 break;
580 case LCPOPT_PFC:
581 break;
582 case LCPOPT_ACFC:
583 break;
584 case LCPOPT_LD:
585 if (len == 4)
586 printf(" 0x%04x", EXTRACT_16BITS(p + 2));
587 break;
588 case LCPOPT_CBACK:
589 if (len < 3)
590 break;
591 switch (p[2]) { /* Operation */
592 case CALLBACK_AUTH:
593 printf(" UserAuth");
594 break;
595 case CALLBACK_DSTR:
596 printf(" DialString");
597 break;
598 case CALLBACK_LID:
599 printf(" LocalID");
600 break;
601 case CALLBACK_E164:
602 printf(" E.164");
603 break;
604 case CALLBACK_X500:
605 printf(" X.500");
606 break;
607 case CALLBACK_CBCP:
608 printf(" CBCP");
609 break;
610 default:
611 printf(" unknown-operation=%u", p[2]);
612 break;
613 }
614 break;
615 case LCPOPT_MLMRRU:
616 if (len == 4)
617 printf(" %u", EXTRACT_16BITS(p + 2));
618 break;
619 case LCPOPT_MLED:
620 if (len < 3)
621 break;
622 switch (p[2]) { /* class */
623 case MEDCLASS_NULL:
624 printf(" Null");
625 break;
626 case MEDCLASS_LOCAL:
627 printf(" Local"); /* XXX */
628 break;
629 case MEDCLASS_IPV4:
630 if (len != 7)
631 break;
632 printf(" IPv4 %s", ipaddr_string(p + 3));
633 break;
634 case MEDCLASS_MAC:
635 if (len != 9)
636 break;
637 printf(" MAC %02x:%02x:%02x:%02x:%02x:%02x",
638 p[3], p[4], p[5], p[6], p[7], p[8]);
639 break;
640 case MEDCLASS_MNB:
641 printf(" Magic-Num-Block"); /* XXX */
642 break;
643 case MEDCLASS_PSNDN:
644 printf(" PSNDN"); /* XXX */
645 break;
646 }
647 break;
648
649 /* XXX: to be supported */
650 #if 0
651 case LCPOPT_DEP6:
652 case LCPOPT_FCSALT:
653 case LCPOPT_SDP:
654 case LCPOPT_NUMMODE:
655 case LCPOPT_DEP12:
656 case LCPOPT_DEP14:
657 case LCPOPT_DEP15:
658 case LCPOPT_DEP16:
659 case LCPOPT_MLSSNHF:
660 case LCPOPT_PROP:
661 case LCPOPT_DCEID:
662 case LCPOPT_MPP:
663 case LCPOPT_LCPAOPT:
664 case LCPOPT_COBS:
665 case LCPOPT_PE:
666 case LCPOPT_MLHF:
667 case LCPOPT_I18N:
668 case LCPOPT_SDLOS:
669 case LCPOPT_PPPMUX:
670 break;
671 #endif
672 }
673 return len;
674 }
675
676 /* CHAP */
677 static void
678 handle_chap(const u_char *p, int length)
679 {
680 u_int code, len;
681 int val_size, name_size, msg_size;
682 const u_char *p0;
683 int i;
684
685 p0 = p;
686 if (length < 1) {
687 printf("[|chap]");
688 return;
689 } else if (length < 4) {
690 printf("[|chap 0x%02x]", *p);
691 return;
692 }
693
694 code = *p;
695 if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
696 printf("%s", chapcode[code - 1]);
697 else {
698 printf("0x%02x", code);
699 return;
700 }
701 p++;
702
703 printf("(%u)", *p); /* ID */
704 p++;
705
706 len = EXTRACT_16BITS(p);
707 p += 2;
708
709 /*
710 * Note that this is a generic CHAP decoding routine. Since we
711 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
712 * MS-CHAPv2) is used at this point, we can't decode packet
713 * specifically to each algorithms. Instead, we simply decode
714 * the GCD (Gratest Common Denominator) for all algorithms.
715 */
716 switch (code) {
717 case CHAP_CHAL:
718 case CHAP_RESP:
719 if (length - (p - p0) < 1)
720 return;
721 val_size = *p; /* value size */
722 p++;
723 if (length - (p - p0) < val_size)
724 return;
725 printf(", Value ");
726 for (i = 0; i < val_size; i++)
727 printf("%02x", *p++);
728 name_size = len - (p - p0);
729 printf(", Name ");
730 for (i = 0; i < name_size; i++)
731 safeputchar(*p++);
732 break;
733 case CHAP_SUCC:
734 case CHAP_FAIL:
735 msg_size = len - (p - p0);
736 printf(", Msg ");
737 for (i = 0; i< msg_size; i++)
738 safeputchar(*p++);
739 break;
740 }
741 }
742
743 /* PAP (see RFC 1334) */
744 static void
745 handle_pap(const u_char *p, int length)
746 {
747 u_int code, len;
748 int peerid_len, passwd_len, msg_len;
749 const u_char *p0;
750 int i;
751
752 p0 = p;
753 if (length < 1) {
754 printf("[|pap]");
755 return;
756 } else if (length < 4) {
757 printf("[|pap 0x%02x]", *p);
758 return;
759 }
760
761 code = *p;
762 if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
763 printf("%s", papcode[code - 1]);
764 else {
765 printf("0x%02x", code);
766 return;
767 }
768 p++;
769
770 printf("(%u)", *p); /* ID */
771 p++;
772
773 len = EXTRACT_16BITS(p);
774 p += 2;
775
776 switch (code) {
777 case PAP_AREQ:
778 if (length - (p - p0) < 1)
779 return;
780 peerid_len = *p; /* Peer-ID Length */
781 p++;
782 if (length - (p - p0) < peerid_len)
783 return;
784 printf(", Peer ");
785 for (i = 0; i < peerid_len; i++)
786 safeputchar(*p++);
787
788 if (length - (p - p0) < 1)
789 return;
790 passwd_len = *p; /* Password Length */
791 p++;
792 if (length - (p - p0) < passwd_len)
793 return;
794 printf(", Name ");
795 for (i = 0; i < passwd_len; i++)
796 safeputchar(*p++);
797 break;
798 case PAP_AACK:
799 case PAP_ANAK:
800 if (length - (p - p0) < 1)
801 return;
802 msg_len = *p; /* Msg-Length */
803 p++;
804 if (length - (p - p0) < msg_len)
805 return;
806 printf(", Msg ");
807 for (i = 0; i< msg_len; i++)
808 safeputchar(*p++);
809 break;
810 }
811 return;
812 }
813
814 /* BAP */
815 static void
816 handle_bap(const u_char *p _U_, int length _U_)
817 {
818 /* XXX: to be supported!! */
819 }
820
821
822 /* IPCP config options */
823 static int
824 print_ipcp_config_options(const u_char *p, int length)
825 {
826 int len, opt;
827
828 if (length < 2)
829 return 0;
830 len = p[1];
831 opt = p[0];
832 if (length < len)
833 return 0;
834 switch (opt) {
835 case IPCPOPT_2ADDR: /* deprecated */
836 if (len != 10)
837 goto invlen;
838 printf(", IP-Addrs src %s, dst %s",
839 ipaddr_string(p + 2),
840 ipaddr_string(p + 6));
841 break;
842 case IPCPOPT_IPCOMP:
843 if (len < 4)
844 goto invlen;
845 printf(", IP-Comp");
846 if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
847 printf(" VJ-Comp");
848 /* XXX: VJ-Comp parameters should be decoded */
849 } else
850 printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
851 break;
852 case IPCPOPT_ADDR:
853 if (len != 6)
854 goto invlen;
855 printf(", IP-Addr %s", ipaddr_string(p + 2));
856 break;
857 case IPCPOPT_MOBILE4:
858 if (len != 6)
859 goto invlen;
860 printf(", Home-Addr %s", ipaddr_string(p + 2));
861 break;
862 case IPCPOPT_PRIDNS:
863 if (len != 6)
864 goto invlen;
865 printf(", Pri-DNS %s", ipaddr_string(p + 2));
866 break;
867 case IPCPOPT_PRINBNS:
868 if (len != 6)
869 goto invlen;
870 printf(", Pri-NBNS %s", ipaddr_string(p + 2));
871 break;
872 case IPCPOPT_SECDNS:
873 if (len != 6)
874 goto invlen;
875 printf(", Sec-DNS %s", ipaddr_string(p + 2));
876 break;
877 case IPCPOPT_SECNBNS:
878 if (len != 6)
879 goto invlen;
880 printf(", Sec-NBNS %s", ipaddr_string(p + 2));
881 break;
882 default:
883 printf(", unknown-%d", opt);
884 break;
885 }
886 return len;
887
888 invlen:
889 printf(", invalid-length-%d", opt);
890 return 0;
891 }
892
893 /* CCP config options */
894 static int
895 print_ccp_config_options(const u_char *p, int length)
896 {
897 int len, opt;
898
899 if (length < 2)
900 return 0;
901 len = p[1];
902 opt = p[0];
903 if (length < len)
904 return 0;
905 if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
906 printf(", %s", ccpconfopts[opt]);
907 #if 0 /* XXX */
908 switch (opt) {
909 case CCPOPT_OUI:
910 case CCPOPT_PRED1:
911 case CCPOPT_PRED2:
912 case CCPOPT_PJUMP:
913 case CCPOPT_HPPPC:
914 case CCPOPT_STACLZS:
915 case CCPOPT_MPPC:
916 case CCPOPT_GFZA:
917 case CCPOPT_V42BIS:
918 case CCPOPT_BSDCOMP:
919 case CCPOPT_LZSDCP:
920 case CCPOPT_MVRCA:
921 case CCPOPT_DEC:
922 case CCPOPT_DEFLATE:
923 case CCPOPT_RESV:
924 break;
925
926 default:
927 printf(", unknown-%d", opt);
928 break;
929 }
930 #endif
931 return len;
932 }
933
934 /* BACP config options */
935 static int
936 print_bacp_config_options(const u_char *p, int length)
937 {
938 int len, opt;
939
940 if (length < 2)
941 return 0;
942 len = p[1];
943 opt = p[0];
944 if (length < len)
945 return 0;
946 if (opt == BACPOPT_FPEER) {
947 printf(", Favored-Peer");
948 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
949 } else {
950 printf(", unknown-option-%d", opt);
951 }
952 return len;
953 }
954
955
956 /* PPP */
957 static void
958 handle_ppp(u_int proto, const u_char *p, int length)
959 {
960 switch (proto) {
961 case PPP_LCP:
962 case PPP_IPCP:
963 case PPP_OSICP:
964 case PPP_MPLSCP:
965 case PPP_IPV6CP:
966 case PPP_CCP:
967 case PPP_BACP:
968 handle_ctrl_proto(proto, p, length);
969 break;
970 case PPP_CHAP:
971 handle_chap(p, length);
972 break;
973 case PPP_PAP:
974 handle_pap(p, length);
975 break;
976 case PPP_BAP: /* XXX: not yet completed */
977 handle_bap(p, length);
978 break;
979 case ETHERTYPE_IP: /*XXX*/
980 case PPP_IP:
981 ip_print(p, length);
982 break;
983 #ifdef INET6
984 case ETHERTYPE_IPV6: /*XXX*/
985 case PPP_IPV6:
986 ip6_print(p, length);
987 break;
988 #endif
989 case ETHERTYPE_IPX: /*XXX*/
990 case PPP_IPX:
991 ipx_print(p, length);
992 break;
993 case PPP_OSI:
994 isoclns_print(p, length, length);
995 break;
996 case PPP_MPLS_UCAST:
997 case PPP_MPLS_MCAST:
998 mpls_print(p, length);
999 break;
1000 default:
1001 printf("unknown PPP protocol (0x%04x)", proto);
1002 print_unknown_data(p,"\n\t",length);
1003 break;
1004 }
1005 }
1006
1007 /* Standard PPP printer */
1008 u_int
1009 ppp_print(register const u_char *p, u_int length)
1010 {
1011 u_int proto;
1012 u_int olen = length; /* _o_riginal length */
1013 u_int hdr_len = 0;
1014
1015 /*
1016 * Here, we assume that p points to the Address and Control
1017 * field (if they present).
1018 */
1019 if (length < 2)
1020 goto trunc;
1021 if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
1022 p += 2; /* ACFC not used */
1023 length -= 2;
1024 hdr_len += 2;
1025 }
1026
1027 if (length < 2)
1028 goto trunc;
1029 if (*p % 2) {
1030 proto = *p; /* PFC is used */
1031 p++;
1032 length--;
1033 hdr_len++;
1034 } else {
1035 proto = EXTRACT_16BITS(p);
1036 p += 2;
1037 length -= 2;
1038 hdr_len += 2;
1039 }
1040
1041 if (eflag)
1042 printf("PPP-%s (0x%04x), length %u: ",
1043 tok2str(ppptype2str, "unknown", proto),
1044 proto,
1045 olen);
1046
1047 handle_ppp(proto, p, length);
1048 return (hdr_len);
1049 trunc:
1050 printf("[|ppp]");
1051 return (0);
1052 }
1053
1054
1055 /* PPP I/F printer */
1056 u_int
1057 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1058 {
1059 register u_int length = h->len;
1060 register u_int caplen = h->caplen;
1061
1062 if (caplen < PPP_HDRLEN) {
1063 printf("[|ppp]");
1064 return (caplen);
1065 }
1066
1067 #if 0
1068 /*
1069 * XXX: seems to assume that there are 2 octets prepended to an
1070 * actual PPP frame. The 1st octet looks like Input/Output flag
1071 * while 2nd octet is unknown, at least to me
1072 * (mshindo@mshindo.net).
1073 *
1074 * That was what the original tcpdump code did.
1075 *
1076 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1077 * packets and 0 for inbound packets - but only if the
1078 * protocol field has the 0x8000 bit set (i.e., it's a network
1079 * control protocol); it does so before running the packet through
1080 * "bpf_filter" to see if it should be discarded, and to see
1081 * if we should update the time we sent the most recent packet...
1082 *
1083 * ...but it puts the original address field back after doing
1084 * so.
1085 *
1086 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1087 *
1088 * I don't know if any PPP implementation handed up to a BPF
1089 * device packets with the first octet being 1 for outbound and
1090 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1091 * whether that ever needs to be checked or not.
1092 *
1093 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1094 * and its tcpdump appears to assume that the frame always
1095 * begins with an address field and a control field, and that
1096 * the address field might be 0x0f or 0x8f, for Cisco
1097 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1098 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1099 * RFC 1662.
1100 *
1101 * (Is the Cisco framing in question what DLT_C_HDLC, in
1102 * BSD/OS, is?)
1103 */
1104 if (eflag)
1105 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
1106 #endif
1107
1108 ppp_print(p, length);
1109
1110 return (0);
1111 }
1112
1113 /*
1114 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1115 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1116 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1117 * discard them *if* those are the first two octets, and parse the remaining
1118 * packet as a PPP packet, as "ppp_print()" does).
1119 *
1120 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1121 */
1122 u_int
1123 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1124 {
1125 register u_int length = h->len;
1126 register u_int caplen = h->caplen;
1127 u_int proto;
1128 u_int hdrlen = 0;
1129
1130 if (caplen < 2) {
1131 printf("[|ppp]");
1132 return (caplen);
1133 }
1134
1135 switch (p[0]) {
1136
1137 case PPP_ADDRESS:
1138 if (caplen < 4) {
1139 printf("[|ppp]");
1140 return (caplen);
1141 }
1142
1143 if (eflag)
1144 printf("%02x %02x %d ", p[0], p[1], length);
1145 p += 2;
1146 length -= 2;
1147 hdrlen += 2;
1148
1149 proto = EXTRACT_16BITS(p);
1150 p += 2;
1151 length -= 2;
1152 hdrlen += 2;
1153 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1154
1155 handle_ppp(proto, p, length);
1156 break;
1157
1158 case CHDLC_UNICAST:
1159 case CHDLC_BCAST:
1160 return (chdlc_if_print(h, p));
1161
1162 default:
1163 if (eflag)
1164 printf("%02x %02x %d ", p[0], p[1], length);
1165 p += 2;
1166 length -= 2;
1167 hdrlen += 2;
1168
1169 /*
1170 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1171 * the next two octets as an Ethernet type; does that
1172 * ever happen?
1173 */
1174 printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
1175 break;
1176 }
1177
1178 return (hdrlen);
1179 }
1180
1181 #define PPP_BSDI_HDRLEN 24
1182
1183 /* BSD/OS specific PPP printer */
1184 u_int
1185 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1186 {
1187 register int hdrlength;
1188 #ifdef __bsdi__
1189 register u_int length = h->len;
1190 register u_int caplen = h->caplen;
1191 u_int16_t ptype;
1192 const u_char *q;
1193 int i;
1194
1195 if (caplen < PPP_BSDI_HDRLEN) {
1196 printf("[|ppp]");
1197 return (caplen)
1198 }
1199
1200 hdrlength = 0;
1201
1202 #if 0
1203 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1204 if (eflag)
1205 printf("%02x %02x ", p[0], p[1]);
1206 p += 2;
1207 hdrlength = 2;
1208 }
1209
1210 if (eflag)
1211 printf("%d ", length);
1212 /* Retrieve the protocol type */
1213 if (*p & 01) {
1214 /* Compressed protocol field */
1215 ptype = *p;
1216 if (eflag)
1217 printf("%02x ", ptype);
1218 p++;
1219 hdrlength += 1;
1220 } else {
1221 /* Un-compressed protocol field */
1222 ptype = ntohs(*(u_int16_t *)p);
1223 if (eflag)
1224 printf("%04x ", ptype);
1225 p += 2;
1226 hdrlength += 2;
1227 }
1228 #else
1229 ptype = 0; /*XXX*/
1230 if (eflag)
1231 printf("%c ", p[SLC_DIR] ? 'O' : 'I');
1232 if (p[SLC_LLHL]) {
1233 /* link level header */
1234 struct ppp_header *ph;
1235
1236 q = p + SLC_BPFHDRLEN;
1237 ph = (struct ppp_header *)q;
1238 if (ph->phdr_addr == PPP_ADDRESS
1239 && ph->phdr_ctl == PPP_CONTROL) {
1240 if (eflag)
1241 printf("%02x %02x ", q[0], q[1]);
1242 ptype = ntohs(ph->phdr_type);
1243 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1244 printf("%s ", tok2str(ppptype2str,
1245 "proto-#%d", ptype));
1246 }
1247 } else {
1248 if (eflag) {
1249 printf("LLH=[");
1250 for (i = 0; i < p[SLC_LLHL]; i++)
1251 printf("%02x", q[i]);
1252 printf("] ");
1253 }
1254 }
1255 }
1256 if (eflag)
1257 printf("%d ", length);
1258 if (p[SLC_CHL]) {
1259 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1260
1261 switch (ptype) {
1262 case PPP_VJC:
1263 ptype = vjc_print(q, ptype);
1264 hdrlength = PPP_BSDI_HDRLEN;
1265 p += hdrlength;
1266 switch (ptype) {
1267 case PPP_IP:
1268 ip_print(p, length);
1269 break;
1270 #ifdef INET6
1271 case PPP_IPV6:
1272 ip6_print(p, length);
1273 break;
1274 #endif
1275 case PPP_MPLS_UCAST:
1276 case PPP_MPLS_MCAST:
1277 mpls_print(p, length);
1278 break;
1279 }
1280 goto printx;
1281 case PPP_VJNC:
1282 ptype = vjc_print(q, ptype);
1283 hdrlength = PPP_BSDI_HDRLEN;
1284 p += hdrlength;
1285 switch (ptype) {
1286 case PPP_IP:
1287 ip_print(p, length);
1288 break;
1289 #ifdef INET6
1290 case PPP_IPV6:
1291 ip6_print(p, length);
1292 break;
1293 #endif
1294 case PPP_MPLS_UCAST:
1295 case PPP_MPLS_MCAST:
1296 mpls_print(p, length);
1297 break;
1298 }
1299 goto printx;
1300 default:
1301 if (eflag) {
1302 printf("CH=[");
1303 for (i = 0; i < p[SLC_LLHL]; i++)
1304 printf("%02x", q[i]);
1305 printf("] ");
1306 }
1307 break;
1308 }
1309 }
1310
1311 hdrlength = PPP_BSDI_HDRLEN;
1312 #endif
1313
1314 length -= hdrlength;
1315 p += hdrlength;
1316
1317 switch (ptype) {
1318 case PPP_IP:
1319 ip_print(p, length);
1320 break;
1321 #ifdef INET6
1322 case PPP_IPV6:
1323 ip6_print(p, length);
1324 break;
1325 #endif
1326 case PPP_MPLS_UCAST:
1327 case PPP_MPLS_MCAST:
1328 mpls_print(p, length);
1329 break;
1330 default:
1331 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1332 }
1333
1334 printx:
1335 #else /* __bsdi */
1336 hdrlength = 0;
1337 #endif /* __bsdi__ */
1338 return (hdrlength);
1339 }
[mirror] the TCPdump network dissector