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[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 1.88 2003-05-22 16:52:38 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 %us", 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 printf(", length %u", length);
485
486 if (vflag >1)
487 print_unknown_data(pptr-2,"\n\t",length+2);
488 }
489
490 /* LCP config options */
491 static int
492 print_lcp_config_options(const u_char *p, int length)
493 {
494 int len, opt;
495
496 if (length < 2)
497 return 0;
498 len = p[1];
499 opt = p[0];
500 if (length < len)
501 return 0;
502 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
503 printf(", %s ", lcpconfopts[opt]);
504 else {
505 printf(", unknown LCP option 0x%02x", opt);
506 return len;
507 }
508
509 switch (opt) {
510 case LCPOPT_VEXT:
511 if (len >= 6) {
512 printf(" OUI 0x%06x", EXTRACT_24BITS(p+2));
513 #if 0
514 printf(" kind 0x%02x", p[5]);
515 printf(" val 0x")
516 for (i = 0; i < len - 6; i++) {
517 printf("%02x", p[6 + i]);
518 }
519 #endif
520 }
521 break;
522 case LCPOPT_MRU:
523 if (len == 4)
524 printf(" %u", EXTRACT_16BITS(p + 2));
525 break;
526 case LCPOPT_ACCM:
527 if (len == 6)
528 printf(" %08x", EXTRACT_32BITS(p + 2));
529 break;
530 case LCPOPT_AP:
531 if (len >= 4) {
532 switch (EXTRACT_16BITS(p+2)) {
533 case PPP_PAP:
534 printf(" PAP");
535 break;
536 case PPP_CHAP:
537 printf(" CHAP");
538 switch (p[4]) {
539 default:
540 printf(", unknown-algorithm-%u", p[4]);
541 break;
542 case AUTHALG_CHAPMD5:
543 printf(", MD5");
544 break;
545 case AUTHALG_MSCHAP1:
546 printf(", MSCHAPv1");
547 break;
548 case AUTHALG_MSCHAP2:
549 printf(", MSCHAPv2");
550 break;
551 }
552 break;
553 case PPP_EAP:
554 printf(" EAP");
555 break;
556 case PPP_SPAP:
557 printf(" SPAP");
558 break;
559 case PPP_SPAP_OLD:
560 printf(" Old-SPAP");
561 break;
562 default:
563 printf("unknown");
564 }
565 }
566 break;
567 case LCPOPT_QP:
568 if (len >= 4) {
569 if (EXTRACT_16BITS(p+2) == PPP_LQM)
570 printf(" LQR");
571 else
572 printf(" unknown");
573 }
574 break;
575 case LCPOPT_MN:
576 if (len == 6)
577 printf(" 0x%08x", EXTRACT_32BITS(p + 2));
578 break;
579 case LCPOPT_PFC:
580 break;
581 case LCPOPT_ACFC:
582 break;
583 case LCPOPT_LD:
584 if (len == 4)
585 printf(" 0x%04x", EXTRACT_16BITS(p + 2));
586 break;
587 case LCPOPT_CBACK:
588 if (len < 3)
589 break;
590 switch (p[2]) { /* Operation */
591 case CALLBACK_AUTH:
592 printf(" UserAuth");
593 break;
594 case CALLBACK_DSTR:
595 printf(" DialString");
596 break;
597 case CALLBACK_LID:
598 printf(" LocalID");
599 break;
600 case CALLBACK_E164:
601 printf(" E.164");
602 break;
603 case CALLBACK_X500:
604 printf(" X.500");
605 break;
606 case CALLBACK_CBCP:
607 printf(" CBCP");
608 break;
609 default:
610 printf(" unknown-operation=%u", p[2]);
611 break;
612 }
613 break;
614 case LCPOPT_MLMRRU:
615 if (len == 4)
616 printf(" %u", EXTRACT_16BITS(p + 2));
617 break;
618 case LCPOPT_MLED:
619 if (len < 3)
620 break;
621 switch (p[2]) { /* class */
622 case MEDCLASS_NULL:
623 printf(" Null");
624 break;
625 case MEDCLASS_LOCAL:
626 printf(" Local"); /* XXX */
627 break;
628 case MEDCLASS_IPV4:
629 if (len != 7)
630 break;
631 printf(" IPv4 %s", ipaddr_string(p + 3));
632 break;
633 case MEDCLASS_MAC:
634 if (len != 9)
635 break;
636 printf(" MAC %02x:%02x:%02x:%02x:%02x:%02x",
637 p[3], p[4], p[5], p[6], p[7], p[8]);
638 break;
639 case MEDCLASS_MNB:
640 printf(" Magic-Num-Block"); /* XXX */
641 break;
642 case MEDCLASS_PSNDN:
643 printf(" PSNDN"); /* XXX */
644 break;
645 }
646 break;
647
648 /* XXX: to be supported */
649 #if 0
650 case LCPOPT_DEP6:
651 case LCPOPT_FCSALT:
652 case LCPOPT_SDP:
653 case LCPOPT_NUMMODE:
654 case LCPOPT_DEP12:
655 case LCPOPT_DEP14:
656 case LCPOPT_DEP15:
657 case LCPOPT_DEP16:
658 case LCPOPT_MLSSNHF:
659 case LCPOPT_PROP:
660 case LCPOPT_DCEID:
661 case LCPOPT_MPP:
662 case LCPOPT_LCPAOPT:
663 case LCPOPT_COBS:
664 case LCPOPT_PE:
665 case LCPOPT_MLHF:
666 case LCPOPT_I18N:
667 case LCPOPT_SDLOS:
668 case LCPOPT_PPPMUX:
669 break;
670 #endif
671 }
672 return len;
673 }
674
675 /* CHAP */
676 static void
677 handle_chap(const u_char *p, int length)
678 {
679 u_int code, len;
680 int val_size, name_size, msg_size;
681 const u_char *p0;
682 int i;
683
684 p0 = p;
685 if (length < 1) {
686 printf("[|chap]");
687 return;
688 } else if (length < 4) {
689 printf("[|chap 0x%02x]", *p);
690 return;
691 }
692
693 code = *p;
694 if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
695 printf("%s", chapcode[code - 1]);
696 else {
697 printf("0x%02x", code);
698 return;
699 }
700 p++;
701
702 printf("(%u)", *p); /* ID */
703 p++;
704
705 len = EXTRACT_16BITS(p);
706 p += 2;
707
708 /*
709 * Note that this is a generic CHAP decoding routine. Since we
710 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
711 * MS-CHAPv2) is used at this point, we can't decode packet
712 * specifically to each algorithms. Instead, we simply decode
713 * the GCD (Gratest Common Denominator) for all algorithms.
714 */
715 switch (code) {
716 case CHAP_CHAL:
717 case CHAP_RESP:
718 if (length - (p - p0) < 1)
719 return;
720 val_size = *p; /* value size */
721 p++;
722 if (length - (p - p0) < val_size)
723 return;
724 printf(", Value ");
725 for (i = 0; i < val_size; i++)
726 printf("%02x", *p++);
727 name_size = len - (p - p0);
728 printf(", Name ");
729 for (i = 0; i < name_size; i++)
730 safeputchar(*p++);
731 break;
732 case CHAP_SUCC:
733 case CHAP_FAIL:
734 msg_size = len - (p - p0);
735 printf(", Msg ");
736 for (i = 0; i< msg_size; i++)
737 safeputchar(*p++);
738 break;
739 }
740 }
741
742 /* PAP (see RFC 1334) */
743 static void
744 handle_pap(const u_char *p, int length)
745 {
746 u_int code, len;
747 int peerid_len, passwd_len, msg_len;
748 const u_char *p0;
749 int i;
750
751 p0 = p;
752 if (length < 1) {
753 printf("[|pap]");
754 return;
755 } else if (length < 4) {
756 printf("[|pap 0x%02x]", *p);
757 return;
758 }
759
760 code = *p;
761 if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
762 printf("%s", papcode[code - 1]);
763 else {
764 printf("0x%02x", code);
765 return;
766 }
767 p++;
768
769 printf("(%u)", *p); /* ID */
770 p++;
771
772 len = EXTRACT_16BITS(p);
773 p += 2;
774
775 switch (code) {
776 case PAP_AREQ:
777 if (length - (p - p0) < 1)
778 return;
779 peerid_len = *p; /* Peer-ID Length */
780 p++;
781 if (length - (p - p0) < peerid_len)
782 return;
783 printf(", Peer ");
784 for (i = 0; i < peerid_len; i++)
785 safeputchar(*p++);
786
787 if (length - (p - p0) < 1)
788 return;
789 passwd_len = *p; /* Password Length */
790 p++;
791 if (length - (p - p0) < passwd_len)
792 return;
793 printf(", Name ");
794 for (i = 0; i < passwd_len; i++)
795 safeputchar(*p++);
796 break;
797 case PAP_AACK:
798 case PAP_ANAK:
799 if (length - (p - p0) < 1)
800 return;
801 msg_len = *p; /* Msg-Length */
802 p++;
803 if (length - (p - p0) < msg_len)
804 return;
805 printf(", Msg ");
806 for (i = 0; i< msg_len; i++)
807 safeputchar(*p++);
808 break;
809 }
810 return;
811 }
812
813 /* BAP */
814 static void
815 handle_bap(const u_char *p _U_, int length _U_)
816 {
817 /* XXX: to be supported!! */
818 }
819
820
821 /* IPCP config options */
822 static int
823 print_ipcp_config_options(const u_char *p, int length)
824 {
825 int len, opt;
826
827 if (length < 2)
828 return 0;
829 len = p[1];
830 opt = p[0];
831 if (length < len)
832 return 0;
833 switch (opt) {
834 case IPCPOPT_2ADDR: /* deprecated */
835 if (len != 10)
836 goto invlen;
837 printf(", IP-Addrs src %s, dst %s",
838 ipaddr_string(p + 2),
839 ipaddr_string(p + 6));
840 break;
841 case IPCPOPT_IPCOMP:
842 if (len < 4)
843 goto invlen;
844 printf(", IP-Comp");
845 if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
846 printf(" VJ-Comp");
847 /* XXX: VJ-Comp parameters should be decoded */
848 } else
849 printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
850 break;
851 case IPCPOPT_ADDR:
852 if (len != 6)
853 goto invlen;
854 printf(", IP-Addr %s", ipaddr_string(p + 2));
855 break;
856 case IPCPOPT_MOBILE4:
857 if (len != 6)
858 goto invlen;
859 printf(", Home-Addr %s", ipaddr_string(p + 2));
860 break;
861 case IPCPOPT_PRIDNS:
862 if (len != 6)
863 goto invlen;
864 printf(", Pri-DNS %s", ipaddr_string(p + 2));
865 break;
866 case IPCPOPT_PRINBNS:
867 if (len != 6)
868 goto invlen;
869 printf(", Pri-NBNS %s", ipaddr_string(p + 2));
870 break;
871 case IPCPOPT_SECDNS:
872 if (len != 6)
873 goto invlen;
874 printf(", Sec-DNS %s", ipaddr_string(p + 2));
875 break;
876 case IPCPOPT_SECNBNS:
877 if (len != 6)
878 goto invlen;
879 printf(", Sec-NBNS %s", ipaddr_string(p + 2));
880 break;
881 default:
882 printf(", unknown-%d", opt);
883 break;
884 }
885 return len;
886
887 invlen:
888 printf(", invalid-length-%d", opt);
889 return 0;
890 }
891
892 /* CCP config options */
893 static int
894 print_ccp_config_options(const u_char *p, int length)
895 {
896 int len, opt;
897
898 if (length < 2)
899 return 0;
900 len = p[1];
901 opt = p[0];
902 if (length < len)
903 return 0;
904 if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
905 printf(", %s", ccpconfopts[opt]);
906 #if 0 /* XXX */
907 switch (opt) {
908 case CCPOPT_OUI:
909 case CCPOPT_PRED1:
910 case CCPOPT_PRED2:
911 case CCPOPT_PJUMP:
912 case CCPOPT_HPPPC:
913 case CCPOPT_STACLZS:
914 case CCPOPT_MPPC:
915 case CCPOPT_GFZA:
916 case CCPOPT_V42BIS:
917 case CCPOPT_BSDCOMP:
918 case CCPOPT_LZSDCP:
919 case CCPOPT_MVRCA:
920 case CCPOPT_DEC:
921 case CCPOPT_DEFLATE:
922 case CCPOPT_RESV:
923 break;
924
925 default:
926 printf(", unknown-%d", opt);
927 break;
928 }
929 #endif
930 return len;
931 }
932
933 /* BACP config options */
934 static int
935 print_bacp_config_options(const u_char *p, int length)
936 {
937 int len, opt;
938
939 if (length < 2)
940 return 0;
941 len = p[1];
942 opt = p[0];
943 if (length < len)
944 return 0;
945 if (opt == BACPOPT_FPEER) {
946 printf(", Favored-Peer");
947 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
948 } else {
949 printf(", unknown-option-%d", opt);
950 }
951 return len;
952 }
953
954
955 /* PPP */
956 static void
957 handle_ppp(u_int proto, const u_char *p, int length)
958 {
959 switch (proto) {
960 case PPP_LCP:
961 case PPP_IPCP:
962 case PPP_OSICP:
963 case PPP_MPLSCP:
964 case PPP_IPV6CP:
965 case PPP_CCP:
966 case PPP_BACP:
967 handle_ctrl_proto(proto, p, length);
968 break;
969 case PPP_CHAP:
970 handle_chap(p, length);
971 break;
972 case PPP_PAP:
973 handle_pap(p, length);
974 break;
975 case PPP_BAP: /* XXX: not yet completed */
976 handle_bap(p, length);
977 break;
978 case ETHERTYPE_IP: /*XXX*/
979 case PPP_IP:
980 ip_print(p, length);
981 break;
982 #ifdef INET6
983 case ETHERTYPE_IPV6: /*XXX*/
984 case PPP_IPV6:
985 ip6_print(p, length);
986 break;
987 #endif
988 case ETHERTYPE_IPX: /*XXX*/
989 case PPP_IPX:
990 ipx_print(p, length);
991 break;
992 case PPP_OSI:
993 isoclns_print(p, length, length);
994 break;
995 case PPP_MPLS_UCAST:
996 case PPP_MPLS_MCAST:
997 mpls_print(p, length);
998 break;
999 default:
1000 printf("unknown PPP protocol (0x%04x)", proto);
1001 print_unknown_data(p,"\n\t",length);
1002 break;
1003 }
1004 }
1005
1006 /* Standard PPP printer */
1007 u_int
1008 ppp_print(register const u_char *p, u_int length)
1009 {
1010 u_int proto;
1011 u_int olen = length; /* _o_riginal length */
1012 u_int hdr_len = 0;
1013
1014 /*
1015 * Here, we assume that p points to the Address and Control
1016 * field (if they present).
1017 */
1018 if (length < 2)
1019 goto trunc;
1020 if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
1021 p += 2; /* ACFC not used */
1022 length -= 2;
1023 hdr_len += 2;
1024 }
1025
1026 if (length < 2)
1027 goto trunc;
1028 if (*p % 2) {
1029 proto = *p; /* PFC is used */
1030 p++;
1031 length--;
1032 hdr_len++;
1033 } else {
1034 proto = EXTRACT_16BITS(p);
1035 p += 2;
1036 length -= 2;
1037 hdr_len += 2;
1038 }
1039
1040 if (eflag)
1041 printf("PPP-%s (0x%04x), length %u: ",
1042 tok2str(ppptype2str, "unknown", proto),
1043 proto,
1044 olen);
1045
1046 handle_ppp(proto, p, length);
1047 return (hdr_len);
1048 trunc:
1049 printf("[|ppp]");
1050 return (0);
1051 }
1052
1053
1054 /* PPP I/F printer */
1055 u_int
1056 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1057 {
1058 register u_int length = h->len;
1059 register u_int caplen = h->caplen;
1060
1061 if (caplen < PPP_HDRLEN) {
1062 printf("[|ppp]");
1063 return (caplen);
1064 }
1065
1066 #if 0
1067 /*
1068 * XXX: seems to assume that there are 2 octets prepended to an
1069 * actual PPP frame. The 1st octet looks like Input/Output flag
1070 * while 2nd octet is unknown, at least to me
1071 * (mshindo@mshindo.net).
1072 *
1073 * That was what the original tcpdump code did.
1074 *
1075 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1076 * packets and 0 for inbound packets - but only if the
1077 * protocol field has the 0x8000 bit set (i.e., it's a network
1078 * control protocol); it does so before running the packet through
1079 * "bpf_filter" to see if it should be discarded, and to see
1080 * if we should update the time we sent the most recent packet...
1081 *
1082 * ...but it puts the original address field back after doing
1083 * so.
1084 *
1085 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1086 *
1087 * I don't know if any PPP implementation handed up to a BPF
1088 * device packets with the first octet being 1 for outbound and
1089 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1090 * whether that ever needs to be checked or not.
1091 *
1092 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1093 * and its tcpdump appears to assume that the frame always
1094 * begins with an address field and a control field, and that
1095 * the address field might be 0x0f or 0x8f, for Cisco
1096 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1097 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1098 * RFC 1662.
1099 *
1100 * (Is the Cisco framing in question what DLT_C_HDLC, in
1101 * BSD/OS, is?)
1102 */
1103 if (eflag)
1104 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
1105 #endif
1106
1107 ppp_print(p, length);
1108
1109 return (0);
1110 }
1111
1112 /*
1113 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1114 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1115 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1116 * discard them *if* those are the first two octets, and parse the remaining
1117 * packet as a PPP packet, as "ppp_print()" does).
1118 *
1119 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1120 */
1121 u_int
1122 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1123 {
1124 register u_int length = h->len;
1125 register u_int caplen = h->caplen;
1126 u_int proto;
1127 u_int hdrlen = 0;
1128
1129 if (caplen < 2) {
1130 printf("[|ppp]");
1131 return (caplen);
1132 }
1133
1134 switch (p[0]) {
1135
1136 case PPP_ADDRESS:
1137 if (caplen < 4) {
1138 printf("[|ppp]");
1139 return (caplen);
1140 }
1141
1142 if (eflag)
1143 printf("%02x %02x %d ", p[0], p[1], length);
1144 p += 2;
1145 length -= 2;
1146 hdrlen += 2;
1147
1148 proto = EXTRACT_16BITS(p);
1149 p += 2;
1150 length -= 2;
1151 hdrlen += 2;
1152 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1153
1154 handle_ppp(proto, p, length);
1155 break;
1156
1157 case CHDLC_UNICAST:
1158 case CHDLC_BCAST:
1159 return (chdlc_if_print(h, p));
1160
1161 default:
1162 if (eflag)
1163 printf("%02x %02x %d ", p[0], p[1], length);
1164 p += 2;
1165 length -= 2;
1166 hdrlen += 2;
1167
1168 /*
1169 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1170 * the next two octets as an Ethernet type; does that
1171 * ever happen?
1172 */
1173 printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
1174 break;
1175 }
1176
1177 return (hdrlen);
1178 }
1179
1180 #define PPP_BSDI_HDRLEN 24
1181
1182 /* BSD/OS specific PPP printer */
1183 u_int
1184 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1185 {
1186 register int hdrlength;
1187 #ifdef __bsdi__
1188 register u_int length = h->len;
1189 register u_int caplen = h->caplen;
1190 u_int16_t ptype;
1191 const u_char *q;
1192 int i;
1193
1194 if (caplen < PPP_BSDI_HDRLEN) {
1195 printf("[|ppp]");
1196 return (caplen)
1197 }
1198
1199 hdrlength = 0;
1200
1201 #if 0
1202 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1203 if (eflag)
1204 printf("%02x %02x ", p[0], p[1]);
1205 p += 2;
1206 hdrlength = 2;
1207 }
1208
1209 if (eflag)
1210 printf("%d ", length);
1211 /* Retrieve the protocol type */
1212 if (*p & 01) {
1213 /* Compressed protocol field */
1214 ptype = *p;
1215 if (eflag)
1216 printf("%02x ", ptype);
1217 p++;
1218 hdrlength += 1;
1219 } else {
1220 /* Un-compressed protocol field */
1221 ptype = ntohs(*(u_int16_t *)p);
1222 if (eflag)
1223 printf("%04x ", ptype);
1224 p += 2;
1225 hdrlength += 2;
1226 }
1227 #else
1228 ptype = 0; /*XXX*/
1229 if (eflag)
1230 printf("%c ", p[SLC_DIR] ? 'O' : 'I');
1231 if (p[SLC_LLHL]) {
1232 /* link level header */
1233 struct ppp_header *ph;
1234
1235 q = p + SLC_BPFHDRLEN;
1236 ph = (struct ppp_header *)q;
1237 if (ph->phdr_addr == PPP_ADDRESS
1238 && ph->phdr_ctl == PPP_CONTROL) {
1239 if (eflag)
1240 printf("%02x %02x ", q[0], q[1]);
1241 ptype = ntohs(ph->phdr_type);
1242 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1243 printf("%s ", tok2str(ppptype2str,
1244 "proto-#%d", ptype));
1245 }
1246 } else {
1247 if (eflag) {
1248 printf("LLH=[");
1249 for (i = 0; i < p[SLC_LLHL]; i++)
1250 printf("%02x", q[i]);
1251 printf("] ");
1252 }
1253 }
1254 }
1255 if (eflag)
1256 printf("%d ", length);
1257 if (p[SLC_CHL]) {
1258 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1259
1260 switch (ptype) {
1261 case PPP_VJC:
1262 ptype = vjc_print(q, ptype);
1263 hdrlength = PPP_BSDI_HDRLEN;
1264 p += hdrlength;
1265 switch (ptype) {
1266 case PPP_IP:
1267 ip_print(p, length);
1268 break;
1269 #ifdef INET6
1270 case PPP_IPV6:
1271 ip6_print(p, length);
1272 break;
1273 #endif
1274 case PPP_MPLS_UCAST:
1275 case PPP_MPLS_MCAST:
1276 mpls_print(p, length);
1277 break;
1278 }
1279 goto printx;
1280 case PPP_VJNC:
1281 ptype = vjc_print(q, ptype);
1282 hdrlength = PPP_BSDI_HDRLEN;
1283 p += hdrlength;
1284 switch (ptype) {
1285 case PPP_IP:
1286 ip_print(p, length);
1287 break;
1288 #ifdef INET6
1289 case PPP_IPV6:
1290 ip6_print(p, length);
1291 break;
1292 #endif
1293 case PPP_MPLS_UCAST:
1294 case PPP_MPLS_MCAST:
1295 mpls_print(p, length);
1296 break;
1297 }
1298 goto printx;
1299 default:
1300 if (eflag) {
1301 printf("CH=[");
1302 for (i = 0; i < p[SLC_LLHL]; i++)
1303 printf("%02x", q[i]);
1304 printf("] ");
1305 }
1306 break;
1307 }
1308 }
1309
1310 hdrlength = PPP_BSDI_HDRLEN;
1311 #endif
1312
1313 length -= hdrlength;
1314 p += hdrlength;
1315
1316 switch (ptype) {
1317 case PPP_IP:
1318 ip_print(p, length);
1319 break;
1320 #ifdef INET6
1321 case PPP_IPV6:
1322 ip6_print(p, length);
1323 break;
1324 #endif
1325 case PPP_MPLS_UCAST:
1326 case PPP_MPLS_MCAST:
1327 mpls_print(p, length);
1328 break;
1329 default:
1330 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1331 }
1332
1333 printx:
1334 #else /* __bsdi */
1335 hdrlength = 0;
1336 #endif /* __bsdi__ */
1337 return (hdrlength);
1338 }
[mirror] the TCPdump network dissector