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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 1.83 2003-05-15 15:25:19 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=%08x", EXTRACT_32BITS(tptr));
406 tptr += 4;
407 printf(" OUI=%02x%02x%02x", tptr[0], tptr[1], tptr[2]);
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-Protocol=%04x", EXTRACT_16BITS(tptr));
456 /* XXX: need to decode Rejected-Information? */
457 break;
458 case CPCODES_ECHO_REQ:
459 case CPCODES_ECHO_RPL:
460 case CPCODES_DISC_REQ:
461 case CPCODES_ID:
462 if (length < 8)
463 break;
464 printf(", Magic-Num=%08x", EXTRACT_32BITS(tptr));
465 /* XXX: need to decode Data? */
466 break;
467 case CPCODES_TIME_REM:
468 if (length < 12)
469 break;
470 printf(", Magic-Num=%08x", EXTRACT_32BITS(tptr));
471 printf(" Seconds-Remaining=%u", EXTRACT_32BITS(tptr + 4));
472 /* XXX: need to decode Message? */
473 break;
474 default:
475 /* XXX this is dirty but we do not get the
476 * original pointer passed to the begin
477 * the PPP packet */
478 if (vflag <= 1)
479 print_unknown_data(pptr-2,"\n\t",length+2);
480 break;
481 }
482
483 if (vflag >1)
484 print_unknown_data(pptr-2,"\n\t",length+2);
485 }
486
487 /* LCP config options */
488 static int
489 print_lcp_config_options(const u_char *p, int length)
490 {
491 int len, opt;
492
493 if (length < 2)
494 return 0;
495 len = p[1];
496 opt = p[0];
497 if (length < len)
498 return 0;
499 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
500 printf(", %s ", lcpconfopts[opt]);
501 else {
502 printf(", unknown LCP option 0x%02x", opt);
503 return len;
504 }
505
506 switch (opt) {
507 case LCPOPT_VEXT:
508 if (len >= 6) {
509 printf(" OUI=%02x%02x%02x", p[2], p[3], p[4]);
510 #if 0
511 printf(" kind=%02x", p[5]);
512 printf(" val=")
513 for (i = 0; i < len - 6; i++) {
514 printf("%02x", p[6 + i]);
515 }
516 #endif
517 }
518 break;
519 case LCPOPT_MRU:
520 if (len == 4)
521 printf("=%u", EXTRACT_16BITS(p + 2));
522 break;
523 case LCPOPT_ACCM:
524 if (len == 6)
525 printf("=%08x", EXTRACT_32BITS(p + 2));
526 break;
527 case LCPOPT_AP:
528 if (len >= 4) {
529 if (p[2] == 0xc0 && p[3] == 0x23)
530 printf(" PAP");
531 else if (p[2] == 0xc2 && p[3] == 0x23) {
532 printf(" CHAP/");
533 switch (p[4]) {
534 default:
535 printf("unknown-algorithm-%u", p[4]);
536 break;
537 case AUTHALG_CHAPMD5:
538 printf("MD5");
539 break;
540 case AUTHALG_MSCHAP1:
541 printf("MSCHAPv1");
542 break;
543 case AUTHALG_MSCHAP2:
544 printf("MSCHAPv2");
545 break;
546 }
547 }
548 else if (p[2] == 0xc2 && p[3] == 0x27)
549 printf(" EAP");
550 else if (p[2] == 0xc0 && p[3] == 0x27)
551 printf(" SPAP");
552 else if (p[2] == 0xc1 && p[3] == 0x23)
553 printf(" Old-SPAP");
554 else
555 printf("unknown");
556 }
557 break;
558 case LCPOPT_QP:
559 if (len >= 4) {
560 if (p[2] == 0xc0 && p[3] == 0x25)
561 printf(" LQR");
562 else
563 printf(" unknown");
564 }
565 break;
566 case LCPOPT_MN:
567 if (len == 6)
568 printf("=%08x", EXTRACT_32BITS(p + 2));
569 break;
570 case LCPOPT_PFC:
571 break;
572 case LCPOPT_ACFC:
573 break;
574 case LCPOPT_LD:
575 if (len == 4)
576 printf("=%04x", EXTRACT_16BITS(p + 2));
577 break;
578 case LCPOPT_CBACK:
579 if (len < 3)
580 break;
581 switch (p[2]) { /* Operation */
582 case CALLBACK_AUTH:
583 printf(" UserAuth");
584 break;
585 case CALLBACK_DSTR:
586 printf(" DialString");
587 break;
588 case CALLBACK_LID:
589 printf(" LocalID");
590 break;
591 case CALLBACK_E164:
592 printf(" E.164");
593 break;
594 case CALLBACK_X500:
595 printf(" X.500");
596 break;
597 case CALLBACK_CBCP:
598 printf(" CBCP");
599 break;
600 default:
601 printf(" unknown-operation=%u", p[2]);
602 break;
603 }
604 break;
605 case LCPOPT_MLMRRU:
606 if (len == 4)
607 printf("=%u", EXTRACT_16BITS(p + 2));
608 break;
609 case LCPOPT_MLED:
610 if (len < 3)
611 break;
612 switch (p[2]) { /* class */
613 case MEDCLASS_NULL:
614 printf(" Null");
615 break;
616 case MEDCLASS_LOCAL:
617 printf(" Local"); /* XXX */
618 break;
619 case MEDCLASS_IPV4:
620 if (len != 7)
621 break;
622 printf(" IPv4=%s", ipaddr_string(p + 3));
623 break;
624 case MEDCLASS_MAC:
625 if (len != 9)
626 break;
627 printf(" MAC=%02x:%02x:%02x:%02x:%02x:%02x",
628 p[3], p[4], p[5], p[6], p[7], p[8]);
629 break;
630 case MEDCLASS_MNB:
631 printf(" Magic-Num-Block"); /* XXX */
632 break;
633 case MEDCLASS_PSNDN:
634 printf(" PSNDN"); /* XXX */
635 break;
636 }
637 break;
638
639 /* XXX: to be supported */
640 #if 0
641 case LCPOPT_DEP6:
642 case LCPOPT_FCSALT:
643 case LCPOPT_SDP:
644 case LCPOPT_NUMMODE:
645 case LCPOPT_DEP12:
646 case LCPOPT_DEP14:
647 case LCPOPT_DEP15:
648 case LCPOPT_DEP16:
649 case LCPOPT_MLSSNHF:
650 case LCPOPT_PROP:
651 case LCPOPT_DCEID:
652 case LCPOPT_MPP:
653 case LCPOPT_LCPAOPT:
654 case LCPOPT_COBS:
655 case LCPOPT_PE:
656 case LCPOPT_MLHF:
657 case LCPOPT_I18N:
658 case LCPOPT_SDLOS:
659 case LCPOPT_PPPMUX:
660 break;
661 #endif
662 }
663 return len;
664 }
665
666 /* CHAP */
667 static void
668 handle_chap(const u_char *p, int length)
669 {
670 u_int code, len;
671 int val_size, name_size, msg_size;
672 const u_char *p0;
673 int i;
674
675 p0 = p;
676 if (length < 1) {
677 printf("[|chap]");
678 return;
679 } else if (length < 4) {
680 printf("[|chap 0x%02x]", *p);
681 return;
682 }
683
684 code = *p;
685 if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
686 printf("%s", chapcode[code - 1]);
687 else {
688 printf("0x%02x", code);
689 return;
690 }
691 p++;
692
693 printf("(%u)", *p); /* ID */
694 p++;
695
696 len = EXTRACT_16BITS(p);
697 p += 2;
698
699 /*
700 * Note that this is a generic CHAP decoding routine. Since we
701 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
702 * MS-CHAPv2) is used at this point, we can't decode packet
703 * specifically to each algorithms. Instead, we simply decode
704 * the GCD (Gratest Common Denominator) for all algorithms.
705 */
706 switch (code) {
707 case CHAP_CHAL:
708 case CHAP_RESP:
709 if (length - (p - p0) < 1)
710 return;
711 val_size = *p; /* value size */
712 p++;
713 if (length - (p - p0) < val_size)
714 return;
715 printf(", Value=");
716 for (i = 0; i < val_size; i++)
717 printf("%02x", *p++);
718 name_size = len - (p - p0);
719 printf(", Name=");
720 for (i = 0; i < name_size; i++)
721 safeputchar(*p++);
722 break;
723 case CHAP_SUCC:
724 case CHAP_FAIL:
725 msg_size = len - (p - p0);
726 printf(", Msg=");
727 for (i = 0; i< msg_size; i++)
728 safeputchar(*p++);
729 break;
730 }
731 }
732
733 /* PAP (see RFC 1334) */
734 static void
735 handle_pap(const u_char *p, int length)
736 {
737 u_int code, len;
738 int peerid_len, passwd_len, msg_len;
739 const u_char *p0;
740 int i;
741
742 p0 = p;
743 if (length < 1) {
744 printf("[|pap]");
745 return;
746 } else if (length < 4) {
747 printf("[|pap 0x%02x]", *p);
748 return;
749 }
750
751 code = *p;
752 if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
753 printf("%s", papcode[code - 1]);
754 else {
755 printf("0x%02x", code);
756 return;
757 }
758 p++;
759
760 printf("(%u)", *p); /* ID */
761 p++;
762
763 len = EXTRACT_16BITS(p);
764 p += 2;
765
766 switch (code) {
767 case PAP_AREQ:
768 if (length - (p - p0) < 1)
769 return;
770 peerid_len = *p; /* Peer-ID Length */
771 p++;
772 if (length - (p - p0) < peerid_len)
773 return;
774 printf(", Peer=");
775 for (i = 0; i < peerid_len; i++)
776 safeputchar(*p++);
777
778 if (length - (p - p0) < 1)
779 return;
780 passwd_len = *p; /* Password Length */
781 p++;
782 if (length - (p - p0) < passwd_len)
783 return;
784 printf(", Name=");
785 for (i = 0; i < passwd_len; i++)
786 safeputchar(*p++);
787 break;
788 case PAP_AACK:
789 case PAP_ANAK:
790 if (length - (p - p0) < 1)
791 return;
792 msg_len = *p; /* Msg-Length */
793 p++;
794 if (length - (p - p0) < msg_len)
795 return;
796 printf(", Msg=");
797 for (i = 0; i< msg_len; i++)
798 safeputchar(*p++);
799 break;
800 }
801 return;
802 }
803
804 /* BAP */
805 static void
806 handle_bap(const u_char *p _U_, int length _U_)
807 {
808 /* XXX: to be supported!! */
809 }
810
811
812 /* IPCP config options */
813 static int
814 print_ipcp_config_options(const u_char *p, int length)
815 {
816 int len, opt;
817
818 if (length < 2)
819 return 0;
820 len = p[1];
821 opt = p[0];
822 if (length < len)
823 return 0;
824 switch (opt) {
825 case IPCPOPT_2ADDR: /* deprecated */
826 if (len != 10)
827 goto invlen;
828 printf(", IP-Addrs src=%s dst=%s",
829 ipaddr_string(p + 2),
830 ipaddr_string(p + 6));
831 break;
832 case IPCPOPT_IPCOMP:
833 if (len < 4)
834 goto invlen;
835 printf(", IP-Comp");
836 if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
837 printf(" VJ-Comp");
838 /* XXX: VJ-Comp parameters should be decoded */
839 } else
840 printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
841 break;
842 case IPCPOPT_ADDR:
843 if (len != 6)
844 goto invlen;
845 printf(", IP-Addr=%s", ipaddr_string(p + 2));
846 break;
847 case IPCPOPT_MOBILE4:
848 if (len != 6)
849 goto invlen;
850 printf(", Home-Addr=%s", ipaddr_string(p + 2));
851 break;
852 case IPCPOPT_PRIDNS:
853 if (len != 6)
854 goto invlen;
855 printf(", Pri-DNS=%s", ipaddr_string(p + 2));
856 break;
857 case IPCPOPT_PRINBNS:
858 if (len != 6)
859 goto invlen;
860 printf(", Pri-NBNS=%s", ipaddr_string(p + 2));
861 break;
862 case IPCPOPT_SECDNS:
863 if (len != 6)
864 goto invlen;
865 printf(", Sec-DNS=%s", ipaddr_string(p + 2));
866 break;
867 case IPCPOPT_SECNBNS:
868 if (len != 6)
869 goto invlen;
870 printf(", Sec-NBNS=%s", ipaddr_string(p + 2));
871 break;
872 default:
873 printf(", unknown-%d", opt);
874 break;
875 }
876 return len;
877
878 invlen:
879 printf(", invalid-length-%d", opt);
880 return 0;
881 }
882
883 /* CCP config options */
884 static int
885 print_ccp_config_options(const u_char *p, int length)
886 {
887 int len, opt;
888
889 if (length < 2)
890 return 0;
891 len = p[1];
892 opt = p[0];
893 if (length < len)
894 return 0;
895 if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
896 printf(", %s", ccpconfopts[opt]);
897 #if 0 /* XXX */
898 switch (opt) {
899 case CCPOPT_OUI:
900 case CCPOPT_PRED1:
901 case CCPOPT_PRED2:
902 case CCPOPT_PJUMP:
903 case CCPOPT_HPPPC:
904 case CCPOPT_STACLZS:
905 case CCPOPT_MPPC:
906 case CCPOPT_GFZA:
907 case CCPOPT_V42BIS:
908 case CCPOPT_BSDCOMP:
909 case CCPOPT_LZSDCP:
910 case CCPOPT_MVRCA:
911 case CCPOPT_DEC:
912 case CCPOPT_DEFLATE:
913 case CCPOPT_RESV:
914 break;
915
916 default:
917 printf(", unknown-%d", opt);
918 break;
919 }
920 #endif
921 return len;
922 }
923
924 /* BACP config options */
925 static int
926 print_bacp_config_options(const u_char *p, int length)
927 {
928 int len, opt;
929
930 if (length < 2)
931 return 0;
932 len = p[1];
933 opt = p[0];
934 if (length < len)
935 return 0;
936 if (opt == BACPOPT_FPEER) {
937 printf(", Favored-Peer");
938 printf(" Magic-Num=%08x", EXTRACT_32BITS(p + 2));
939 } else {
940 printf(", unknown-option-%d", opt);
941 }
942 return len;
943 }
944
945
946 /* PPP */
947 static void
948 handle_ppp(u_int proto, const u_char *p, int length)
949 {
950 switch (proto) {
951 case PPP_LCP:
952 case PPP_IPCP:
953 case PPP_CCP:
954 case PPP_BACP:
955 handle_ctrl_proto(proto, p, length);
956 break;
957 case PPP_CHAP:
958 handle_chap(p, length);
959 break;
960 case PPP_PAP:
961 handle_pap(p, length);
962 break;
963 case PPP_BAP: /* XXX: not yet completed */
964 handle_bap(p, length);
965 break;
966 case ETHERTYPE_IP: /*XXX*/
967 case PPP_IP:
968 ip_print(p, length);
969 break;
970 #ifdef INET6
971 case ETHERTYPE_IPV6: /*XXX*/
972 case PPP_IPV6:
973 ip6_print(p, length);
974 break;
975 #endif
976 case ETHERTYPE_IPX: /*XXX*/
977 case PPP_IPX:
978 ipx_print(p, length);
979 break;
980 case PPP_OSI:
981 isoclns_print(p, length, length, NULL, NULL);
982 break;
983 case PPP_MPLS_UCAST:
984 case PPP_MPLS_MCAST:
985 mpls_print(p, length);
986 break;
987 default:
988 printf("unknown PPP protocol (0x%04x)", proto);
989 print_unknown_data(p,"\n\t",length);
990 break;
991 }
992 }
993
994 /* Standard PPP printer */
995 u_int
996 ppp_print(register const u_char *p, u_int length)
997 {
998 u_int proto;
999 u_int olen = length; /* _o_riginal length */
1000 u_int hdr_len = 0;
1001
1002 /*
1003 * Here, we assume that p points to the Address and Control
1004 * field (if they present).
1005 */
1006 if (length < 2)
1007 goto trunc;
1008 if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) {
1009 p += 2; /* ACFC not used */
1010 length -= 2;
1011 hdr_len += 2;
1012 }
1013
1014 if (length < 2)
1015 goto trunc;
1016 if (*p % 2) {
1017 proto = *p; /* PFC is used */
1018 p++;
1019 length--;
1020 hdr_len++;
1021 } else {
1022 proto = EXTRACT_16BITS(p);
1023 p += 2;
1024 length -= 2;
1025 hdr_len += 2;
1026 }
1027
1028 if (eflag)
1029 printf("PPP-%s (0x%04x) length: %u, ",
1030 tok2str(ppptype2str, "unknown", proto),
1031 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 }
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