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cleanup Magic-Num fields
[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[] =
34 "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.86 2003-05-22 15:40:08 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 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, id %u",
392 tok2str(cpcodes, "Unknown Opcode 0x%02x",code),
393 *tptr++); /* ID */
394
395 len = EXTRACT_16BITS(tptr);
396 tptr += 2;
397
398 if (length <= 4)
399 return; /* there may be a NULL confreq etc. */
400
401 switch (code) {
402 case CPCODES_VEXT:
403 if (length < 11)
404 break;
405 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
406 tptr += 4;
407 printf(" OUI 0x%06x", EXTRACT_24BITS(tptr));
408 /* XXX: need to decode Kind and Value(s)? */
409 break;
410 case CPCODES_CONF_REQ:
411 case CPCODES_CONF_ACK:
412 case CPCODES_CONF_NAK:
413 case CPCODES_CONF_REJ:
414 x = len - 4; /* Code(1), Identifier(1) and Length(2) */
415 do {
416 switch (proto) {
417 case PPP_LCP:
418 pfunc = print_lcp_config_options;
419 break;
420 case PPP_IPCP:
421 pfunc = print_ipcp_config_options;
422 break;
423 case PPP_CCP:
424 pfunc = print_ccp_config_options;
425 break;
426 case PPP_BACP:
427 pfunc = print_bacp_config_options;
428 break;
429 default:
430 /*
431 * This should never happen, but we set
432 * "pfunc" to squelch uninitialized
433 * variable warnings from compilers.
434 */
435 pfunc = NULL;
436 break;
437 }
438 if ((j = (*pfunc)(tptr, len)) == 0)
439 break;
440 x -= j;
441 tptr += j;
442 } while (x > 0);
443 break;
444
445 case CPCODES_TERM_REQ:
446 case CPCODES_TERM_ACK:
447 /* XXX: need to decode Data? */
448 break;
449 case CPCODES_CODE_REJ:
450 /* XXX: need to decode Rejected-Packet? */
451 break;
452 case CPCODES_PROT_REJ:
453 if (length < 6)
454 break;
455 printf(", Rejected %s Protocol (0x%04x)",
456 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
457 EXTRACT_16BITS(tptr));
458 /* XXX: need to decode Rejected-Information? */
459 break;
460 case CPCODES_ECHO_REQ:
461 case CPCODES_ECHO_RPL:
462 case CPCODES_DISC_REQ:
463 case CPCODES_ID:
464 if (length < 8)
465 break;
466 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
467 /* XXX: need to decode Data? */
468 break;
469 case CPCODES_TIME_REM:
470 if (length < 12)
471 break;
472 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
473 printf(" Seconds-Remaining=%u", EXTRACT_32BITS(tptr + 4));
474 /* XXX: need to decode Message? */
475 break;
476 default:
477 /* XXX this is dirty but we do not get the
478 * original pointer passed to the begin
479 * the PPP packet */
480 if (vflag <= 1)
481 print_unknown_data(pptr-2,"\n\t",length+2);
482 break;
483 }
484
485 if (vflag >1)
486 print_unknown_data(pptr-2,"\n\t",length+2);
487 }
488
489 /* LCP config options */
490 static int
491 print_lcp_config_options(const u_char *p, int length)
492 {
493 int len, opt;
494
495 if (length < 2)
496 return 0;
497 len = p[1];
498 opt = p[0];
499 if (length < len)
500 return 0;
501 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
502 printf(", %s ", lcpconfopts[opt]);
503 else {
504 printf(", unknown LCP option 0x%02x", opt);
505 return len;
506 }
507
508 switch (opt) {
509 case LCPOPT_VEXT:
510 if (len >= 6) {
511 printf(" OUI 0x%06x", EXTRACT_24BITS(p+2));
512 #if 0
513 printf(" kind 0x%02x", p[5]);
514 printf(" val 0x")
515 for (i = 0; i < len - 6; i++) {
516 printf("%02x", p[6 + i]);
517 }
518 #endif
519 }
520 break;
521 case LCPOPT_MRU:
522 if (len == 4)
523 printf(" %u", EXTRACT_16BITS(p + 2));
524 break;
525 case LCPOPT_ACCM:
526 if (len == 6)
527 printf(" %08x", EXTRACT_32BITS(p + 2));
528 break;
529 case LCPOPT_AP:
530 if (len >= 4) {
531 switch (EXTRACT_16BITS(p+2)) {
532 case PPP_PAP:
533 printf(" PAP");
534 break;
535 case PPP_CHAP:
536 printf(" CHAP");
537 switch (p[4]) {
538 default:
539 printf(", unknown-algorithm-%u", p[4]);
540 break;
541 case AUTHALG_CHAPMD5:
542 printf(", MD5");
543 break;
544 case AUTHALG_MSCHAP1:
545 printf(", MSCHAPv1");
546 break;
547 case AUTHALG_MSCHAP2:
548 printf(", MSCHAPv2");
549 break;
550 }
551 break;
552 case PPP_EAP:
553 printf(" EAP");
554 break;
555 case PPP_SPAP:
556 printf(" SPAP");
557 break;
558 case PPP_SPAP_OLD:
559 printf(" Old-SPAP");
560 break;
561 default:
562 printf("unknown");
563 }
564 }
565 break;
566 case LCPOPT_QP:
567 if (len >= 4) {
568 if (EXTRACT_16BITS(p+2) == PPP_LQM)
569 printf(" LQR");
570 else
571 printf(" unknown");
572 }
573 break;
574 case LCPOPT_MN:
575 if (len == 6)
576 printf(" 0x%08x", EXTRACT_32BITS(p + 2));
577 break;
578 case LCPOPT_PFC:
579 break;
580 case LCPOPT_ACFC:
581 break;
582 case LCPOPT_LD:
583 if (len == 4)
584 printf(" 0x%04x", EXTRACT_16BITS(p + 2));
585 break;
586 case LCPOPT_CBACK:
587 if (len < 3)
588 break;
589 switch (p[2]) { /* Operation */
590 case CALLBACK_AUTH:
591 printf(" UserAuth");
592 break;
593 case CALLBACK_DSTR:
594 printf(" DialString");
595 break;
596 case CALLBACK_LID:
597 printf(" LocalID");
598 break;
599 case CALLBACK_E164:
600 printf(" E.164");
601 break;
602 case CALLBACK_X500:
603 printf(" X.500");
604 break;
605 case CALLBACK_CBCP:
606 printf(" CBCP");
607 break;
608 default:
609 printf(" unknown-operation=%u", p[2]);
610 break;
611 }
612 break;
613 case LCPOPT_MLMRRU:
614 if (len == 4)
615 printf(" %u", EXTRACT_16BITS(p + 2));
616 break;
617 case LCPOPT_MLED:
618 if (len < 3)
619 break;
620 switch (p[2]) { /* class */
621 case MEDCLASS_NULL:
622 printf(" Null");
623 break;
624 case MEDCLASS_LOCAL:
625 printf(" Local"); /* XXX */
626 break;
627 case MEDCLASS_IPV4:
628 if (len != 7)
629 break;
630 printf(" IPv4 %s", ipaddr_string(p + 3));
631 break;
632 case MEDCLASS_MAC:
633 if (len != 9)
634 break;
635 printf(" MAC %02x:%02x:%02x:%02x:%02x:%02x",
636 p[3], p[4], p[5], p[6], p[7], p[8]);
637 break;
638 case MEDCLASS_MNB:
639 printf(" Magic-Num-Block"); /* XXX */
640 break;
641 case MEDCLASS_PSNDN:
642 printf(" PSNDN"); /* XXX */
643 break;
644 }
645 break;
646
647 /* XXX: to be supported */
648 #if 0
649 case LCPOPT_DEP6:
650 case LCPOPT_FCSALT:
651 case LCPOPT_SDP:
652 case LCPOPT_NUMMODE:
653 case LCPOPT_DEP12:
654 case LCPOPT_DEP14:
655 case LCPOPT_DEP15:
656 case LCPOPT_DEP16:
657 case LCPOPT_MLSSNHF:
658 case LCPOPT_PROP:
659 case LCPOPT_DCEID:
660 case LCPOPT_MPP:
661 case LCPOPT_LCPAOPT:
662 case LCPOPT_COBS:
663 case LCPOPT_PE:
664 case LCPOPT_MLHF:
665 case LCPOPT_I18N:
666 case LCPOPT_SDLOS:
667 case LCPOPT_PPPMUX:
668 break;
669 #endif
670 }
671 return len;
672 }
673
674 /* CHAP */
675 static void
676 handle_chap(const u_char *p, int length)
677 {
678 u_int code, len;
679 int val_size, name_size, msg_size;
680 const u_char *p0;
681 int i;
682
683 p0 = p;
684 if (length < 1) {
685 printf("[|chap]");
686 return;
687 } else if (length < 4) {
688 printf("[|chap 0x%02x]", *p);
689 return;
690 }
691
692 code = *p;
693 if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
694 printf("%s", chapcode[code - 1]);
695 else {
696 printf("0x%02x", code);
697 return;
698 }
699 p++;
700
701 printf("(%u)", *p); /* ID */
702 p++;
703
704 len = EXTRACT_16BITS(p);
705 p += 2;
706
707 /*
708 * Note that this is a generic CHAP decoding routine. Since we
709 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
710 * MS-CHAPv2) is used at this point, we can't decode packet
711 * specifically to each algorithms. Instead, we simply decode
712 * the GCD (Gratest Common Denominator) for all algorithms.
713 */
714 switch (code) {
715 case CHAP_CHAL:
716 case CHAP_RESP:
717 if (length - (p - p0) < 1)
718 return;
719 val_size = *p; /* value size */
720 p++;
721 if (length - (p - p0) < val_size)
722 return;
723 printf(", Value ");
724 for (i = 0; i < val_size; i++)
725 printf("%02x", *p++);
726 name_size = len - (p - p0);
727 printf(", Name ");
728 for (i = 0; i < name_size; i++)
729 safeputchar(*p++);
730 break;
731 case CHAP_SUCC:
732 case CHAP_FAIL:
733 msg_size = len - (p - p0);
734 printf(", Msg ");
735 for (i = 0; i< msg_size; i++)
736 safeputchar(*p++);
737 break;
738 }
739 }
740
741 /* PAP (see RFC 1334) */
742 static void
743 handle_pap(const u_char *p, int length)
744 {
745 u_int code, len;
746 int peerid_len, passwd_len, msg_len;
747 const u_char *p0;
748 int i;
749
750 p0 = p;
751 if (length < 1) {
752 printf("[|pap]");
753 return;
754 } else if (length < 4) {
755 printf("[|pap 0x%02x]", *p);
756 return;
757 }
758
759 code = *p;
760 if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
761 printf("%s", papcode[code - 1]);
762 else {
763 printf("0x%02x", code);
764 return;
765 }
766 p++;
767
768 printf("(%u)", *p); /* ID */
769 p++;
770
771 len = EXTRACT_16BITS(p);
772 p += 2;
773
774 switch (code) {
775 case PAP_AREQ:
776 if (length - (p - p0) < 1)
777 return;
778 peerid_len = *p; /* Peer-ID Length */
779 p++;
780 if (length - (p - p0) < peerid_len)
781 return;
782 printf(", Peer ");
783 for (i = 0; i < peerid_len; i++)
784 safeputchar(*p++);
785
786 if (length - (p - p0) < 1)
787 return;
788 passwd_len = *p; /* Password Length */
789 p++;
790 if (length - (p - p0) < passwd_len)
791 return;
792 printf(", Name ");
793 for (i = 0; i < passwd_len; i++)
794 safeputchar(*p++);
795 break;
796 case PAP_AACK:
797 case PAP_ANAK:
798 if (length - (p - p0) < 1)
799 return;
800 msg_len = *p; /* Msg-Length */
801 p++;
802 if (length - (p - p0) < msg_len)
803 return;
804 printf(", Msg ");
805 for (i = 0; i< msg_len; i++)
806 safeputchar(*p++);
807 break;
808 }
809 return;
810 }
811
812 /* BAP */
813 static void
814 handle_bap(const u_char *p _U_, int length _U_)
815 {
816 /* XXX: to be supported!! */
817 }
818
819
820 /* IPCP config options */
821 static int
822 print_ipcp_config_options(const u_char *p, int length)
823 {
824 int len, opt;
825
826 if (length < 2)
827 return 0;
828 len = p[1];
829 opt = p[0];
830 if (length < len)
831 return 0;
832 switch (opt) {
833 case IPCPOPT_2ADDR: /* deprecated */
834 if (len != 10)
835 goto invlen;
836 printf(", IP-Addrs src %s, dst %s",
837 ipaddr_string(p + 2),
838 ipaddr_string(p + 6));
839 break;
840 case IPCPOPT_IPCOMP:
841 if (len < 4)
842 goto invlen;
843 printf(", IP-Comp");
844 if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
845 printf(" VJ-Comp");
846 /* XXX: VJ-Comp parameters should be decoded */
847 } else
848 printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
849 break;
850 case IPCPOPT_ADDR:
851 if (len != 6)
852 goto invlen;
853 printf(", IP-Addr %s", ipaddr_string(p + 2));
854 break;
855 case IPCPOPT_MOBILE4:
856 if (len != 6)
857 goto invlen;
858 printf(", Home-Addr %s", ipaddr_string(p + 2));
859 break;
860 case IPCPOPT_PRIDNS:
861 if (len != 6)
862 goto invlen;
863 printf(", Pri-DNS %s", ipaddr_string(p + 2));
864 break;
865 case IPCPOPT_PRINBNS:
866 if (len != 6)
867 goto invlen;
868 printf(", Pri-NBNS %s", ipaddr_string(p + 2));
869 break;
870 case IPCPOPT_SECDNS:
871 if (len != 6)
872 goto invlen;
873 printf(", Sec-DNS %s", ipaddr_string(p + 2));
874 break;
875 case IPCPOPT_SECNBNS:
876 if (len != 6)
877 goto invlen;
878 printf(", Sec-NBNS %s", ipaddr_string(p + 2));
879 break;
880 default:
881 printf(", unknown-%d", opt);
882 break;
883 }
884 return len;
885
886 invlen:
887 printf(", invalid-length-%d", opt);
888 return 0;
889 }
890
891 /* CCP config options */
892 static int
893 print_ccp_config_options(const u_char *p, int length)
894 {
895 int len, opt;
896
897 if (length < 2)
898 return 0;
899 len = p[1];
900 opt = p[0];
901 if (length < len)
902 return 0;
903 if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
904 printf(", %s", ccpconfopts[opt]);
905 #if 0 /* XXX */
906 switch (opt) {
907 case CCPOPT_OUI:
908 case CCPOPT_PRED1:
909 case CCPOPT_PRED2:
910 case CCPOPT_PJUMP:
911 case CCPOPT_HPPPC:
912 case CCPOPT_STACLZS:
913 case CCPOPT_MPPC:
914 case CCPOPT_GFZA:
915 case CCPOPT_V42BIS:
916 case CCPOPT_BSDCOMP:
917 case CCPOPT_LZSDCP:
918 case CCPOPT_MVRCA:
919 case CCPOPT_DEC:
920 case CCPOPT_DEFLATE:
921 case CCPOPT_RESV:
922 break;
923
924 default:
925 printf(", unknown-%d", opt);
926 break;
927 }
928 #endif
929 return len;
930 }
931
932 /* BACP config options */
933 static int
934 print_bacp_config_options(const u_char *p, int length)
935 {
936 int len, opt;
937
938 if (length < 2)
939 return 0;
940 len = p[1];
941 opt = p[0];
942 if (length < len)
943 return 0;
944 if (opt == BACPOPT_FPEER) {
945 printf(", Favored-Peer");
946 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
947 } else {
948 printf(", unknown-option-%d", opt);
949 }
950 return len;
951 }
952
953
954 /* PPP */
955 static void
956 handle_ppp(u_int proto, const u_char *p, int length)
957 {
958 switch (proto) {
959 case PPP_LCP:
960 case PPP_IPCP:
961 case PPP_OSICP:
962 case PPP_MPLSCP:
963 case PPP_IPV6CP:
964 case PPP_CCP:
965 case PPP_BACP:
966 handle_ctrl_proto(proto, p, length);
967 break;
968 case PPP_CHAP:
969 handle_chap(p, length);
970 break;
971 case PPP_PAP:
972 handle_pap(p, length);
973 break;
974 case PPP_BAP: /* XXX: not yet completed */
975 handle_bap(p, length);
976 break;
977 case ETHERTYPE_IP: /*XXX*/
978 case PPP_IP:
979 ip_print(p, length);
980 break;
981 #ifdef INET6
982 case ETHERTYPE_IPV6: /*XXX*/
983 case PPP_IPV6:
984 ip6_print(p, length);
985 break;
986 #endif
987 case ETHERTYPE_IPX: /*XXX*/
988 case PPP_IPX:
989 ipx_print(p, length);
990 break;
991 case PPP_OSI:
992 isoclns_print(p, length, length, NULL, NULL);
993 break;
994 case PPP_MPLS_UCAST:
995 case PPP_MPLS_MCAST:
996 mpls_print(p, length);
997 break;
998 default:
999 printf("unknown PPP protocol (0x%04x)", proto);
1000 print_unknown_data(p,"\n\t",length);
1001 break;
1002 }
1003 }
1004
1005 /* Standard PPP printer */
1006 u_int
1007 ppp_print(register const u_char *p, u_int length)
1008 {
1009 u_int proto;
1010 u_int olen = length; /* _o_riginal length */
1011 u_int hdr_len = 0;
1012
1013 /*
1014 * Here, we assume that p points to the Address and Control
1015 * field (if they present).
1016 */
1017 if (length < 2)
1018 goto trunc;
1019 if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
1020 p += 2; /* ACFC not used */
1021 length -= 2;
1022 hdr_len += 2;
1023 }
1024
1025 if (length < 2)
1026 goto trunc;
1027 if (*p % 2) {
1028 proto = *p; /* PFC is used */
1029 p++;
1030 length--;
1031 hdr_len++;
1032 } else {
1033 proto = EXTRACT_16BITS(p);
1034 p += 2;
1035 length -= 2;
1036 hdr_len += 2;
1037 }
1038
1039 if (eflag)
1040 printf("PPP-%s (0x%04x), length %u: ",
1041 tok2str(ppptype2str, "unknown", proto),
1042 proto,
1043 olen);
1044
1045 handle_ppp(proto, p, length);
1046 return (hdr_len);
1047 trunc:
1048 printf("[|ppp]");
1049 return (0);
1050 }
1051
1052
1053 /* PPP I/F printer */
1054 u_int
1055 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1056 {
1057 register u_int length = h->len;
1058 register u_int caplen = h->caplen;
1059
1060 if (caplen < PPP_HDRLEN) {
1061 printf("[|ppp]");
1062 return (caplen);
1063 }
1064
1065 #if 0
1066 /*
1067 * XXX: seems to assume that there are 2 octets prepended to an
1068 * actual PPP frame. The 1st octet looks like Input/Output flag
1069 * while 2nd octet is unknown, at least to me
1070 * (mshindo@mshindo.net).
1071 *
1072 * That was what the original tcpdump code did.
1073 *
1074 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1075 * packets and 0 for inbound packets - but only if the
1076 * protocol field has the 0x8000 bit set (i.e., it's a network
1077 * control protocol); it does so before running the packet through
1078 * "bpf_filter" to see if it should be discarded, and to see
1079 * if we should update the time we sent the most recent packet...
1080 *
1081 * ...but it puts the original address field back after doing
1082 * so.
1083 *
1084 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1085 *
1086 * I don't know if any PPP implementation handed up to a BPF
1087 * device packets with the first octet being 1 for outbound and
1088 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1089 * whether that ever needs to be checked or not.
1090 *
1091 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1092 * and its tcpdump appears to assume that the frame always
1093 * begins with an address field and a control field, and that
1094 * the address field might be 0x0f or 0x8f, for Cisco
1095 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1096 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1097 * RFC 1662.
1098 *
1099 * (Is the Cisco framing in question what DLT_C_HDLC, in
1100 * BSD/OS, is?)
1101 */
1102 if (eflag)
1103 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
1104 #endif
1105
1106 ppp_print(p, length);
1107
1108 return (0);
1109 }
1110
1111 /*
1112 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1113 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1114 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1115 * discard them *if* those are the first two octets, and parse the remaining
1116 * packet as a PPP packet, as "ppp_print()" does).
1117 *
1118 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1119 */
1120 u_int
1121 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1122 {
1123 register u_int length = h->len;
1124 register u_int caplen = h->caplen;
1125 u_int proto;
1126 u_int hdrlen = 0;
1127
1128 if (caplen < 2) {
1129 printf("[|ppp]");
1130 return (caplen);
1131 }
1132
1133 switch (p[0]) {
1134
1135 case PPP_ADDRESS:
1136 if (caplen < 4) {
1137 printf("[|ppp]");
1138 return (caplen);
1139 }
1140
1141 if (eflag)
1142 printf("%02x %02x %d ", p[0], p[1], length);
1143 p += 2;
1144 length -= 2;
1145 hdrlen += 2;
1146
1147 proto = EXTRACT_16BITS(p);
1148 p += 2;
1149 length -= 2;
1150 hdrlen += 2;
1151 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1152
1153 handle_ppp(proto, p, length);
1154 break;
1155
1156 case CHDLC_UNICAST:
1157 case CHDLC_BCAST:
1158 return (chdlc_if_print(h, p));
1159
1160 default:
1161 if (eflag)
1162 printf("%02x %02x %d ", p[0], p[1], length);
1163 p += 2;
1164 length -= 2;
1165 hdrlen += 2;
1166
1167 /*
1168 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1169 * the next two octets as an Ethernet type; does that
1170 * ever happen?
1171 */
1172 printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
1173 break;
1174 }
1175
1176 return (hdrlen);
1177 }
1178
1179 #define PPP_BSDI_HDRLEN 24
1180
1181 /* BSD/OS specific PPP printer */
1182 u_int
1183 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1184 {
1185 register int hdrlength;
1186 #ifdef __bsdi__
1187 register u_int length = h->len;
1188 register u_int caplen = h->caplen;
1189 u_int16_t ptype;
1190 const u_char *q;
1191 int i;
1192
1193 if (caplen < PPP_BSDI_HDRLEN) {
1194 printf("[|ppp]");
1195 return (caplen)
1196 }
1197
1198 hdrlength = 0;
1199
1200 #if 0
1201 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1202 if (eflag)
1203 printf("%02x %02x ", p[0], p[1]);
1204 p += 2;
1205 hdrlength = 2;
1206 }
1207
1208 if (eflag)
1209 printf("%d ", length);
1210 /* Retrieve the protocol type */
1211 if (*p & 01) {
1212 /* Compressed protocol field */
1213 ptype = *p;
1214 if (eflag)
1215 printf("%02x ", ptype);
1216 p++;
1217 hdrlength += 1;
1218 } else {
1219 /* Un-compressed protocol field */
1220 ptype = ntohs(*(u_int16_t *)p);
1221 if (eflag)
1222 printf("%04x ", ptype);
1223 p += 2;
1224 hdrlength += 2;
1225 }
1226 #else
1227 ptype = 0; /*XXX*/
1228 if (eflag)
1229 printf("%c ", p[SLC_DIR] ? 'O' : 'I');
1230 if (p[SLC_LLHL]) {
1231 /* link level header */
1232 struct ppp_header *ph;
1233
1234 q = p + SLC_BPFHDRLEN;
1235 ph = (struct ppp_header *)q;
1236 if (ph->phdr_addr == PPP_ADDRESS
1237 && ph->phdr_ctl == PPP_CONTROL) {
1238 if (eflag)
1239 printf("%02x %02x ", q[0], q[1]);
1240 ptype = ntohs(ph->phdr_type);
1241 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1242 printf("%s ", tok2str(ppptype2str,
1243 "proto-#%d", ptype));
1244 }
1245 } else {
1246 if (eflag) {
1247 printf("LLH=[");
1248 for (i = 0; i < p[SLC_LLHL]; i++)
1249 printf("%02x", q[i]);
1250 printf("] ");
1251 }
1252 }
1253 }
1254 if (eflag)
1255 printf("%d ", length);
1256 if (p[SLC_CHL]) {
1257 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1258
1259 switch (ptype) {
1260 case PPP_VJC:
1261 ptype = vjc_print(q, ptype);
1262 hdrlength = PPP_BSDI_HDRLEN;
1263 p += hdrlength;
1264 switch (ptype) {
1265 case PPP_IP:
1266 ip_print(p, length);
1267 break;
1268 #ifdef INET6
1269 case PPP_IPV6:
1270 ip6_print(p, length);
1271 break;
1272 #endif
1273 case PPP_MPLS_UCAST:
1274 case PPP_MPLS_MCAST:
1275 mpls_print(p, length);
1276 break;
1277 }
1278 goto printx;
1279 case PPP_VJNC:
1280 ptype = vjc_print(q, ptype);
1281 hdrlength = PPP_BSDI_HDRLEN;
1282 p += hdrlength;
1283 switch (ptype) {
1284 case PPP_IP:
1285 ip_print(p, length);
1286 break;
1287 #ifdef INET6
1288 case PPP_IPV6:
1289 ip6_print(p, length);
1290 break;
1291 #endif
1292 case PPP_MPLS_UCAST:
1293 case PPP_MPLS_MCAST:
1294 mpls_print(p, length);
1295 break;
1296 }
1297 goto printx;
1298 default:
1299 if (eflag) {
1300 printf("CH=[");
1301 for (i = 0; i < p[SLC_LLHL]; i++)
1302 printf("%02x", q[i]);
1303 printf("] ");
1304 }
1305 break;
1306 }
1307 }
1308
1309 hdrlength = PPP_BSDI_HDRLEN;
1310 #endif
1311
1312 length -= hdrlength;
1313 p += hdrlength;
1314
1315 switch (ptype) {
1316 case PPP_IP:
1317 ip_print(p, length);
1318 break;
1319 #ifdef INET6
1320 case PPP_IPV6:
1321 ip6_print(p, length);
1322 break;
1323 #endif
1324 case PPP_MPLS_UCAST:
1325 case PPP_MPLS_MCAST:
1326 mpls_print(p, length);
1327 break;
1328 default:
1329 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1330 }
1331
1332 printx:
1333 #else /* __bsdi */
1334 hdrlength = 0;
1335 #endif /* __bsdi__ */
1336 return (hdrlength);
1337 }
[mirror] the TCPdump network dissector