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Hoist a bunch of stuff that should be done by all if_print routines into
[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 1.80 2002-12-19 09:39:14 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 if (!vflag) /* omit the proto id as we already have printed it */
385 printf("%s: ",tok2str(ppptype2str, "unknown", proto));
386
387 if (length < 4) /* FIXME weak boundary checking */
388 return;
389
390 code = *tptr++;
391
392 printf("%s (%u)",
393 tok2str(cpcodes, "Unknown Opcode 0x%02x",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=%08x", EXTRACT_32BITS(tptr));
407 tptr += 4;
408 printf(" OUI=%02x%02x%02x", tptr[0], tptr[1], tptr[2]);
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-Protocol=%04x", EXTRACT_16BITS(tptr));
457 /* XXX: need to decode Rejected-Information? */
458 break;
459 case CPCODES_ECHO_REQ:
460 case CPCODES_ECHO_RPL:
461 case CPCODES_DISC_REQ:
462 case CPCODES_ID:
463 if (length < 8)
464 break;
465 printf(", Magic-Num=%08x", EXTRACT_32BITS(tptr));
466 /* XXX: need to decode Data? */
467 break;
468 case CPCODES_TIME_REM:
469 if (length < 12)
470 break;
471 printf(", Magic-Num=%08x", EXTRACT_32BITS(tptr));
472 printf(" Seconds-Remaining=%u", EXTRACT_32BITS(tptr + 4));
473 /* XXX: need to decode Message? */
474 break;
475 default:
476 /* XXX this is dirty but we do not get the
477 * original pointer passed to the begin
478 * the PPP packet */
479 if (vflag <= 1)
480 print_unknown_data(pptr-2,"\n\t",length+2);
481 break;
482 }
483
484 if (vflag >1)
485 print_unknown_data(pptr-2,"\n\t",length+2);
486 }
487
488 /* LCP config options */
489 static int
490 print_lcp_config_options(const u_char *p, int length)
491 {
492 int len, opt;
493
494 if (length < 2)
495 return 0;
496 len = p[1];
497 opt = p[0];
498 if (length < len)
499 return 0;
500 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
501 printf(", %s ", lcpconfopts[opt]);
502 else {
503 printf(", unknown LCP option 0x%02x", opt);
504 return len;
505 }
506
507 switch (opt) {
508 case LCPOPT_VEXT:
509 if (len >= 6) {
510 printf(" OUI=%02x%02x%02x", p[2], p[3], p[4]);
511 #if 0
512 printf(" kind=%02x", p[5]);
513 printf(" val=")
514 for (i = 0; i < len - 6; i++) {
515 printf("%02x", p[6 + i]);
516 }
517 #endif
518 }
519 break;
520 case LCPOPT_MRU:
521 if (len == 4)
522 printf("=%u", EXTRACT_16BITS(p + 2));
523 break;
524 case LCPOPT_ACCM:
525 if (len == 6)
526 printf("=%08x", EXTRACT_32BITS(p + 2));
527 break;
528 case LCPOPT_AP:
529 if (len >= 4) {
530 if (p[2] == 0xc0 && p[3] == 0x23)
531 printf(" PAP");
532 else if (p[2] == 0xc2 && p[3] == 0x23) {
533 printf(" CHAP/");
534 switch (p[4]) {
535 default:
536 printf("unknown-algorithm-%u", p[4]);
537 break;
538 case AUTHALG_CHAPMD5:
539 printf("MD5");
540 break;
541 case AUTHALG_MSCHAP1:
542 printf("MSCHAPv1");
543 break;
544 case AUTHALG_MSCHAP2:
545 printf("MSCHAPv2");
546 break;
547 }
548 }
549 else if (p[2] == 0xc2 && p[3] == 0x27)
550 printf(" EAP");
551 else if (p[2] == 0xc0 && p[3] == 0x27)
552 printf(" SPAP");
553 else if (p[2] == 0xc1 && p[3] == 0x23)
554 printf(" Old-SPAP");
555 else
556 printf("unknown");
557 }
558 break;
559 case LCPOPT_QP:
560 if (len >= 4) {
561 if (p[2] == 0xc0 && p[3] == 0x25)
562 printf(" LQR");
563 else
564 printf(" unknown");
565 }
566 break;
567 case LCPOPT_MN:
568 if (len == 6)
569 printf("=%08x", EXTRACT_32BITS(p + 2));
570 break;
571 case LCPOPT_PFC:
572 break;
573 case LCPOPT_ACFC:
574 break;
575 case LCPOPT_LD:
576 if (len == 4)
577 printf("=%04x", EXTRACT_16BITS(p + 2));
578 break;
579 case LCPOPT_CBACK:
580 if (len < 3)
581 break;
582 switch (p[2]) { /* Operation */
583 case CALLBACK_AUTH:
584 printf(" UserAuth");
585 break;
586 case CALLBACK_DSTR:
587 printf(" DialString");
588 break;
589 case CALLBACK_LID:
590 printf(" LocalID");
591 break;
592 case CALLBACK_E164:
593 printf(" E.164");
594 break;
595 case CALLBACK_X500:
596 printf(" X.500");
597 break;
598 case CALLBACK_CBCP:
599 printf(" CBCP");
600 break;
601 default:
602 printf(" unknown-operation=%u", p[2]);
603 break;
604 }
605 break;
606 case LCPOPT_MLMRRU:
607 if (len == 4)
608 printf("=%u", EXTRACT_16BITS(p + 2));
609 break;
610 case LCPOPT_MLED:
611 if (len < 3)
612 break;
613 switch (p[2]) { /* class */
614 case MEDCLASS_NULL:
615 printf(" Null");
616 break;
617 case MEDCLASS_LOCAL:
618 printf(" Local"); /* XXX */
619 break;
620 case MEDCLASS_IPV4:
621 if (len != 7)
622 break;
623 printf(" IPv4=%s", ipaddr_string(p + 3));
624 break;
625 case MEDCLASS_MAC:
626 if (len != 9)
627 break;
628 printf(" MAC=%02x:%02x:%02x:%02x:%02x:%02x",
629 p[3], p[4], p[5], p[6], p[7], p[8]);
630 break;
631 case MEDCLASS_MNB:
632 printf(" Magic-Num-Block"); /* XXX */
633 break;
634 case MEDCLASS_PSNDN:
635 printf(" PSNDN"); /* XXX */
636 break;
637 }
638 break;
639
640 /* XXX: to be supported */
641 #if 0
642 case LCPOPT_DEP6:
643 case LCPOPT_FCSALT:
644 case LCPOPT_SDP:
645 case LCPOPT_NUMMODE:
646 case LCPOPT_DEP12:
647 case LCPOPT_DEP14:
648 case LCPOPT_DEP15:
649 case LCPOPT_DEP16:
650 case LCPOPT_MLSSNHF:
651 case LCPOPT_PROP:
652 case LCPOPT_DCEID:
653 case LCPOPT_MPP:
654 case LCPOPT_LCPAOPT:
655 case LCPOPT_COBS:
656 case LCPOPT_PE:
657 case LCPOPT_MLHF:
658 case LCPOPT_I18N:
659 case LCPOPT_SDLOS:
660 case LCPOPT_PPPMUX:
661 break;
662 #endif
663 }
664 return len;
665 }
666
667 /* CHAP */
668 static void
669 handle_chap(const u_char *p, int length)
670 {
671 u_int code, len;
672 int val_size, name_size, msg_size;
673 const u_char *p0;
674 int i;
675
676 p0 = p;
677 if (length < 1) {
678 printf("[|chap]");
679 return;
680 } else if (length < 4) {
681 printf("[|chap 0x%02x]", *p);
682 return;
683 }
684
685 code = *p;
686 if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
687 printf("%s", chapcode[code - 1]);
688 else {
689 printf("0x%02x", code);
690 return;
691 }
692 p++;
693
694 printf("(%u)", *p); /* ID */
695 p++;
696
697 len = EXTRACT_16BITS(p);
698 p += 2;
699
700 /*
701 * Note that this is a generic CHAP decoding routine. Since we
702 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
703 * MS-CHAPv2) is used at this point, we can't decode packet
704 * specifically to each algorithms. Instead, we simply decode
705 * the GCD (Gratest Common Denominator) for all algorithms.
706 */
707 switch (code) {
708 case CHAP_CHAL:
709 case CHAP_RESP:
710 if (length - (p - p0) < 1)
711 return;
712 val_size = *p; /* value size */
713 p++;
714 if (length - (p - p0) < val_size)
715 return;
716 printf(", Value=");
717 for (i = 0; i < val_size; i++)
718 printf("%02x", *p++);
719 name_size = len - (p - p0);
720 printf(", Name=");
721 for (i = 0; i < name_size; i++)
722 safeputchar(*p++);
723 break;
724 case CHAP_SUCC:
725 case CHAP_FAIL:
726 msg_size = len - (p - p0);
727 printf(", Msg=");
728 for (i = 0; i< msg_size; i++)
729 safeputchar(*p++);
730 break;
731 }
732 }
733
734 /* PAP (see RFC 1334) */
735 static void
736 handle_pap(const u_char *p, int length)
737 {
738 u_int code, len;
739 int peerid_len, passwd_len, msg_len;
740 const u_char *p0;
741 int i;
742
743 p0 = p;
744 if (length < 1) {
745 printf("[|pap]");
746 return;
747 } else if (length < 4) {
748 printf("[|pap 0x%02x]", *p);
749 return;
750 }
751
752 code = *p;
753 if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
754 printf("%s", papcode[code - 1]);
755 else {
756 printf("0x%02x", code);
757 return;
758 }
759 p++;
760
761 printf("(%u)", *p); /* ID */
762 p++;
763
764 len = EXTRACT_16BITS(p);
765 p += 2;
766
767 switch (code) {
768 case PAP_AREQ:
769 if (length - (p - p0) < 1)
770 return;
771 peerid_len = *p; /* Peer-ID Length */
772 p++;
773 if (length - (p - p0) < peerid_len)
774 return;
775 printf(", Peer=");
776 for (i = 0; i < peerid_len; i++)
777 safeputchar(*p++);
778
779 if (length - (p - p0) < 1)
780 return;
781 passwd_len = *p; /* Password Length */
782 p++;
783 if (length - (p - p0) < passwd_len)
784 return;
785 printf(", Name=");
786 for (i = 0; i < passwd_len; i++)
787 safeputchar(*p++);
788 break;
789 case PAP_AACK:
790 case PAP_ANAK:
791 if (length - (p - p0) < 1)
792 return;
793 msg_len = *p; /* Msg-Length */
794 p++;
795 if (length - (p - p0) < msg_len)
796 return;
797 printf(", Msg=");
798 for (i = 0; i< msg_len; i++)
799 safeputchar(*p++);
800 break;
801 }
802 return;
803 }
804
805 /* BAP */
806 static void
807 handle_bap(const u_char *p _U_, int length _U_)
808 {
809 /* XXX: to be supported!! */
810 }
811
812
813 /* IPCP config options */
814 static int
815 print_ipcp_config_options(const u_char *p, int length)
816 {
817 int len, opt;
818
819 if (length < 2)
820 return 0;
821 len = p[1];
822 opt = p[0];
823 if (length < len)
824 return 0;
825 switch (opt) {
826 case IPCPOPT_2ADDR: /* deprecated */
827 if (len != 10)
828 goto invlen;
829 printf(", IP-Addrs src=%s dst=%s",
830 ipaddr_string(p + 2),
831 ipaddr_string(p + 6));
832 break;
833 case IPCPOPT_IPCOMP:
834 if (len < 4)
835 goto invlen;
836 printf(", IP-Comp");
837 if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
838 printf(" VJ-Comp");
839 /* XXX: VJ-Comp parameters should be decoded */
840 } else
841 printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
842 break;
843 case IPCPOPT_ADDR:
844 if (len != 6)
845 goto invlen;
846 printf(", IP-Addr=%s", ipaddr_string(p + 2));
847 break;
848 case IPCPOPT_MOBILE4:
849 if (len != 6)
850 goto invlen;
851 printf(", Home-Addr=%s", ipaddr_string(p + 2));
852 break;
853 case IPCPOPT_PRIDNS:
854 if (len != 6)
855 goto invlen;
856 printf(", Pri-DNS=%s", ipaddr_string(p + 2));
857 break;
858 case IPCPOPT_PRINBNS:
859 if (len != 6)
860 goto invlen;
861 printf(", Pri-NBNS=%s", ipaddr_string(p + 2));
862 break;
863 case IPCPOPT_SECDNS:
864 if (len != 6)
865 goto invlen;
866 printf(", Sec-DNS=%s", ipaddr_string(p + 2));
867 break;
868 case IPCPOPT_SECNBNS:
869 if (len != 6)
870 goto invlen;
871 printf(", Sec-NBNS=%s", ipaddr_string(p + 2));
872 break;
873 default:
874 printf(", unknown-%d", opt);
875 break;
876 }
877 return len;
878
879 invlen:
880 printf(", invalid-length-%d", opt);
881 return 0;
882 }
883
884 /* CCP config options */
885 static int
886 print_ccp_config_options(const u_char *p, int length)
887 {
888 int len, opt;
889
890 if (length < 2)
891 return 0;
892 len = p[1];
893 opt = p[0];
894 if (length < len)
895 return 0;
896 if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
897 printf(", %s", ccpconfopts[opt]);
898 #if 0 /* XXX */
899 switch (opt) {
900 case CCPOPT_OUI:
901 case CCPOPT_PRED1:
902 case CCPOPT_PRED2:
903 case CCPOPT_PJUMP:
904 case CCPOPT_HPPPC:
905 case CCPOPT_STACLZS:
906 case CCPOPT_MPPC:
907 case CCPOPT_GFZA:
908 case CCPOPT_V42BIS:
909 case CCPOPT_BSDCOMP:
910 case CCPOPT_LZSDCP:
911 case CCPOPT_MVRCA:
912 case CCPOPT_DEC:
913 case CCPOPT_DEFLATE:
914 case CCPOPT_RESV:
915 break;
916
917 default:
918 printf(", unknown-%d", opt);
919 break;
920 }
921 #endif
922 return len;
923 }
924
925 /* BACP config options */
926 static int
927 print_bacp_config_options(const u_char *p, int length)
928 {
929 int len, opt;
930
931 if (length < 2)
932 return 0;
933 len = p[1];
934 opt = p[0];
935 if (length < len)
936 return 0;
937 if (opt == BACPOPT_FPEER) {
938 printf(", Favored-Peer");
939 printf(" Magic-Num=%08x", EXTRACT_32BITS(p + 2));
940 } else {
941 printf(", unknown-option-%d", opt);
942 }
943 return len;
944 }
945
946
947 /* PPP */
948 static void
949 handle_ppp(u_int proto, const u_char *p, int length)
950 {
951 switch (proto) {
952 case PPP_LCP:
953 case PPP_IPCP:
954 case PPP_CCP:
955 case PPP_BACP:
956 handle_ctrl_proto(proto, p, length);
957 break;
958 case PPP_CHAP:
959 handle_chap(p, length);
960 break;
961 case PPP_PAP:
962 handle_pap(p, length);
963 break;
964 case PPP_BAP: /* XXX: not yet completed */
965 handle_bap(p, length);
966 break;
967 case ETHERTYPE_IP: /*XXX*/
968 case PPP_IP:
969 ip_print(p, length);
970 break;
971 #ifdef INET6
972 case ETHERTYPE_IPV6: /*XXX*/
973 case PPP_IPV6:
974 ip6_print(p, length);
975 break;
976 #endif
977 case ETHERTYPE_IPX: /*XXX*/
978 case PPP_IPX:
979 ipx_print(p, length);
980 break;
981 case PPP_OSI:
982 isoclns_print(p, length, length, NULL, NULL);
983 break;
984 case PPP_MPLS_UCAST:
985 case PPP_MPLS_MCAST:
986 mpls_print(p, length);
987 break;
988 default:
989 printf("unknown PPP protocol (0x%04x)", proto);
990 print_unknown_data(p,"\n\t",length);
991 break;
992 }
993 }
994
995 /* Standard PPP printer */
996 u_int
997 ppp_print(register const u_char *p, u_int length)
998 {
999 u_int proto;
1000 u_int olen = length; /* _o_riginal length */
1001 u_int hdr_len = 0;
1002
1003 /*
1004 * Here, we assume that p points to the Address and Control
1005 * field (if they present).
1006 */
1007 if (length < 2)
1008 goto trunc;
1009 if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
1010 p += 2; /* ACFC not used */
1011 length -= 2;
1012 hdr_len += 2;
1013 }
1014
1015 if (length < 2)
1016 goto trunc;
1017 if (*p % 2) {
1018 proto = *p; /* PFC is used */
1019 p++;
1020 length--;
1021 hdr_len++;
1022 } else {
1023 proto = EXTRACT_16BITS(p);
1024 p += 2;
1025 length -= 2;
1026 hdr_len += 2;
1027 }
1028
1029 if (vflag)
1030 printf("PPP-%s (length: %u): ",
1031 tok2str(ppptype2str, "unknown (0x%04x)", proto),
1032 olen);
1033
1034 handle_ppp(proto, p, length);
1035 return (hdr_len);
1036 trunc:
1037 printf("[|ppp]");
1038 return (0);
1039 }
1040
1041
1042 /* PPP I/F printer */
1043 u_int
1044 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1045 {
1046 register u_int length = h->len;
1047 register u_int caplen = h->caplen;
1048
1049 if (caplen < PPP_HDRLEN) {
1050 printf("[|ppp]");
1051 return (caplen);
1052 }
1053
1054 #if 0
1055 /*
1056 * XXX: seems to assume that there are 2 octets prepended to an
1057 * actual PPP frame. The 1st octet looks like Input/Output flag
1058 * while 2nd octet is unknown, at least to me
1059 * (mshindo@mshindo.net).
1060 *
1061 * That was what the original tcpdump code did.
1062 *
1063 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1064 * packets and 0 for inbound packets - but only if the
1065 * protocol field has the 0x8000 bit set (i.e., it's a network
1066 * control protocol); it does so before running the packet through
1067 * "bpf_filter" to see if it should be discarded, and to see
1068 * if we should update the time we sent the most recent packet...
1069 *
1070 * ...but it puts the original address field back after doing
1071 * so.
1072 *
1073 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1074 *
1075 * I don't know if any PPP implementation handed up to a BPF
1076 * device packets with the first octet being 1 for outbound and
1077 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1078 * whether that ever needs to be checked or not.
1079 *
1080 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1081 * and its tcpdump appears to assume that the frame always
1082 * begins with an address field and a control field, and that
1083 * the address field might be 0x0f or 0x8f, for Cisco
1084 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1085 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1086 * RFC 1662.
1087 *
1088 * (Is the Cisco framing in question what DLT_C_HDLC, in
1089 * BSD/OS, is?)
1090 */
1091 if (eflag)
1092 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
1093 #endif
1094
1095 ppp_print(p, length);
1096
1097 return (0);
1098 }
1099
1100 /*
1101 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1102 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1103 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1104 * discard them *if* those are the first two octets, and parse the remaining
1105 * packet as a PPP packet, as "ppp_print()" does).
1106 *
1107 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1108 */
1109 u_int
1110 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1111 {
1112 register u_int length = h->len;
1113 register u_int caplen = h->caplen;
1114 u_int proto;
1115 u_int hdrlen = 0;
1116
1117 if (caplen < 2) {
1118 printf("[|ppp]");
1119 return (caplen);
1120 }
1121
1122 switch (p[0]) {
1123
1124 case PPP_ADDRESS:
1125 if (caplen < 4) {
1126 printf("[|ppp]");
1127 return (caplen);
1128 }
1129
1130 if (eflag)
1131 printf("%02x %02x %d ", p[0], p[1], length);
1132 p += 2;
1133 length -= 2;
1134 hdrlen += 2;
1135
1136 proto = EXTRACT_16BITS(p);
1137 p += 2;
1138 length -= 2;
1139 hdrlen += 2;
1140 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1141
1142 handle_ppp(proto, p, length);
1143 break;
1144
1145 case CHDLC_UNICAST:
1146 case CHDLC_BCAST:
1147 return (chdlc_if_print(h, p));
1148
1149 default:
1150 if (eflag)
1151 printf("%02x %02x %d ", p[0], p[1], length);
1152 p += 2;
1153 length -= 2;
1154 hdrlen += 2;
1155
1156 /*
1157 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1158 * the next two octets as an Ethernet type; does that
1159 * ever happen?
1160 */
1161 printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
1162 break;
1163 }
1164
1165 return (hdrlen);
1166 }
1167
1168 #define PPP_BSDI_HDRLEN 24
1169
1170 /* BSD/OS specific PPP printer */
1171 u_int
1172 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1173 {
1174 register int hdrlength;
1175 #ifdef __bsdi__
1176 register u_int length = h->len;
1177 register u_int caplen = h->caplen;
1178 u_int16_t ptype;
1179 const u_char *q;
1180 int i;
1181
1182 if (caplen < PPP_BSDI_HDRLEN) {
1183 printf("[|ppp]");
1184 return (caplen)
1185 }
1186
1187 hdrlength = 0;
1188
1189 #if 0
1190 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1191 if (eflag)
1192 printf("%02x %02x ", p[0], p[1]);
1193 p += 2;
1194 hdrlength = 2;
1195 }
1196
1197 if (eflag)
1198 printf("%d ", length);
1199 /* Retrieve the protocol type */
1200 if (*p & 01) {
1201 /* Compressed protocol field */
1202 ptype = *p;
1203 if (eflag)
1204 printf("%02x ", ptype);
1205 p++;
1206 hdrlength += 1;
1207 } else {
1208 /* Un-compressed protocol field */
1209 ptype = ntohs(*(u_int16_t *)p);
1210 if (eflag)
1211 printf("%04x ", ptype);
1212 p += 2;
1213 hdrlength += 2;
1214 }
1215 #else
1216 ptype = 0; /*XXX*/
1217 if (eflag)
1218 printf("%c ", p[SLC_DIR] ? 'O' : 'I');
1219 if (p[SLC_LLHL]) {
1220 /* link level header */
1221 struct ppp_header *ph;
1222
1223 q = p + SLC_BPFHDRLEN;
1224 ph = (struct ppp_header *)q;
1225 if (ph->phdr_addr == PPP_ADDRESS
1226 && ph->phdr_ctl == PPP_CONTROL) {
1227 if (eflag)
1228 printf("%02x %02x ", q[0], q[1]);
1229 ptype = ntohs(ph->phdr_type);
1230 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1231 printf("%s ", tok2str(ppptype2str,
1232 "proto-#%d", ptype));
1233 }
1234 } else {
1235 if (eflag) {
1236 printf("LLH=[");
1237 for (i = 0; i < p[SLC_LLHL]; i++)
1238 printf("%02x", q[i]);
1239 printf("] ");
1240 }
1241 }
1242 }
1243 if (eflag)
1244 printf("%d ", length);
1245 if (p[SLC_CHL]) {
1246 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1247
1248 switch (ptype) {
1249 case PPP_VJC:
1250 ptype = vjc_print(q, ptype);
1251 hdrlength = PPP_BSDI_HDRLEN;
1252 p += hdrlength;
1253 switch (ptype) {
1254 case PPP_IP:
1255 ip_print(p, length);
1256 break;
1257 #ifdef INET6
1258 case PPP_IPV6:
1259 ip6_print(p, length);
1260 break;
1261 #endif
1262 case PPP_MPLS_UCAST:
1263 case PPP_MPLS_MCAST:
1264 mpls_print(p, length);
1265 break;
1266 }
1267 goto printx;
1268 case PPP_VJNC:
1269 ptype = vjc_print(q, ptype);
1270 hdrlength = PPP_BSDI_HDRLEN;
1271 p += hdrlength;
1272 switch (ptype) {
1273 case PPP_IP:
1274 ip_print(p, length);
1275 break;
1276 #ifdef INET6
1277 case PPP_IPV6:
1278 ip6_print(p, length);
1279 break;
1280 #endif
1281 case PPP_MPLS_UCAST:
1282 case PPP_MPLS_MCAST:
1283 mpls_print(p, length);
1284 break;
1285 }
1286 goto printx;
1287 default:
1288 if (eflag) {
1289 printf("CH=[");
1290 for (i = 0; i < p[SLC_LLHL]; i++)
1291 printf("%02x", q[i]);
1292 printf("] ");
1293 }
1294 break;
1295 }
1296 }
1297
1298 hdrlength = PPP_BSDI_HDRLEN;
1299 #endif
1300
1301 length -= hdrlength;
1302 p += hdrlength;
1303
1304 switch (ptype) {
1305 case PPP_IP:
1306 ip_print(p, length);
1307 break;
1308 #ifdef INET6
1309 case PPP_IPV6:
1310 ip6_print(p, length);
1311 break;
1312 #endif
1313 case PPP_MPLS_UCAST:
1314 case PPP_MPLS_MCAST:
1315 mpls_print(p, length);
1316 break;
1317 default:
1318 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1319 }
1320
1321 printx:
1322 #else /* __bsdi */
1323 hdrlength = 0;
1324 #endif /* __bsdi__ */
1325 return (hdrlength);
1326 }
[mirror] the TCPdump network dissector