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Another length check, also found by the Clang Static Analyzer.
[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 #ifdef HAVE_CONFIG_H
33 #include "config.h"
34 #endif
35
36 #include <tcpdump-stdinc.h>
37
38 #ifdef __bsdi__
39 #include <net/slcompress.h>
40 #include <net/if_ppp.h>
41 #endif
42
43 #include <pcap.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46
47 #include "interface.h"
48 #include "extract.h"
49 #include "addrtoname.h"
50 #include "ppp.h"
51 #include "chdlc.h"
52 #include "ethertype.h"
53 #include "oui.h"
54
55 /*
56 * The following constatns are defined by IANA. Please refer to
57 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
58 * for the up-to-date information.
59 */
60
61 /* Protocol Codes defined in ppp.h */
62
63 static const struct tok ppptype2str[] = {
64 { PPP_IP, "IP" },
65 { PPP_OSI, "OSI" },
66 { PPP_NS, "NS" },
67 { PPP_DECNET, "DECNET" },
68 { PPP_APPLE, "APPLE" },
69 { PPP_IPX, "IPX" },
70 { PPP_VJC, "VJC IP" },
71 { PPP_VJNC, "VJNC IP" },
72 { PPP_BRPDU, "BRPDU" },
73 { PPP_STII, "STII" },
74 { PPP_VINES, "VINES" },
75 { PPP_MPLS_UCAST, "MPLS" },
76 { PPP_MPLS_MCAST, "MPLS" },
77 { PPP_COMP, "Compressed"},
78 { PPP_ML, "MLPPP"},
79 { PPP_IPV6, "IP6"},
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_IPV6CP, "IP6CP" },
93 { PPP_MPLSCP, "MPLSCP" },
94
95 { PPP_LCP, "LCP" },
96 { PPP_PAP, "PAP" },
97 { PPP_LQM, "LQM" },
98 { PPP_CHAP, "CHAP" },
99 { PPP_EAP, "EAP" },
100 { PPP_SPAP, "SPAP" },
101 { PPP_SPAP_OLD, "Old-SPAP" },
102 { PPP_BACP, "BACP" },
103 { PPP_BAP, "BAP" },
104 { PPP_MPCP, "MLPPP-CP" },
105 { 0, NULL }
106 };
107
108 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */
109
110 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */
111 #define CPCODES_CONF_REQ 1 /* Configure-Request */
112 #define CPCODES_CONF_ACK 2 /* Configure-Ack */
113 #define CPCODES_CONF_NAK 3 /* Configure-Nak */
114 #define CPCODES_CONF_REJ 4 /* Configure-Reject */
115 #define CPCODES_TERM_REQ 5 /* Terminate-Request */
116 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */
117 #define CPCODES_CODE_REJ 7 /* Code-Reject */
118 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */
119 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */
120 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */
121 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */
122 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */
123 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */
124 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */
125 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */
126
127 static const struct tok cpcodes[] = {
128 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */
129 {CPCODES_CONF_REQ, "Conf-Request"},
130 {CPCODES_CONF_ACK, "Conf-Ack"},
131 {CPCODES_CONF_NAK, "Conf-Nack"},
132 {CPCODES_CONF_REJ, "Conf-Reject"},
133 {CPCODES_TERM_REQ, "Term-Request"},
134 {CPCODES_TERM_ACK, "Term-Ack"},
135 {CPCODES_CODE_REJ, "Code-Reject"},
136 {CPCODES_PROT_REJ, "Prot-Reject"},
137 {CPCODES_ECHO_REQ, "Echo-Request"},
138 {CPCODES_ECHO_RPL, "Echo-Reply"},
139 {CPCODES_DISC_REQ, "Disc-Req"},
140 {CPCODES_ID, "Ident"}, /* RFC1570 */
141 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */
142 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */
143 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */
144 {0, NULL}
145 };
146
147 /* LCP Config Options */
148
149 #define LCPOPT_VEXT 0
150 #define LCPOPT_MRU 1
151 #define LCPOPT_ACCM 2
152 #define LCPOPT_AP 3
153 #define LCPOPT_QP 4
154 #define LCPOPT_MN 5
155 #define LCPOPT_DEP6 6
156 #define LCPOPT_PFC 7
157 #define LCPOPT_ACFC 8
158 #define LCPOPT_FCSALT 9
159 #define LCPOPT_SDP 10
160 #define LCPOPT_NUMMODE 11
161 #define LCPOPT_DEP12 12
162 #define LCPOPT_CBACK 13
163 #define LCPOPT_DEP14 14
164 #define LCPOPT_DEP15 15
165 #define LCPOPT_DEP16 16
166 #define LCPOPT_MLMRRU 17
167 #define LCPOPT_MLSSNHF 18
168 #define LCPOPT_MLED 19
169 #define LCPOPT_PROP 20
170 #define LCPOPT_DCEID 21
171 #define LCPOPT_MPP 22
172 #define LCPOPT_LD 23
173 #define LCPOPT_LCPAOPT 24
174 #define LCPOPT_COBS 25
175 #define LCPOPT_PE 26
176 #define LCPOPT_MLHF 27
177 #define LCPOPT_I18N 28
178 #define LCPOPT_SDLOS 29
179 #define LCPOPT_PPPMUX 30
180
181 #define LCPOPT_MIN LCPOPT_VEXT
182 #define LCPOPT_MAX LCPOPT_PPPMUX
183
184 static const char *lcpconfopts[] = {
185 "Vend-Ext", /* (0) */
186 "MRU", /* (1) */
187 "ACCM", /* (2) */
188 "Auth-Prot", /* (3) */
189 "Qual-Prot", /* (4) */
190 "Magic-Num", /* (5) */
191 "deprecated(6)", /* used to be a Quality Protocol */
192 "PFC", /* (7) */
193 "ACFC", /* (8) */
194 "FCS-Alt", /* (9) */
195 "SDP", /* (10) */
196 "Num-Mode", /* (11) */
197 "deprecated(12)", /* used to be a Multi-Link-Procedure*/
198 "Call-Back", /* (13) */
199 "deprecated(14)", /* used to be a Connect-Time */
200 "deprecated(15)", /* used to be a Compund-Frames */
201 "deprecated(16)", /* used to be a Nominal-Data-Encap */
202 "MRRU", /* (17) */
203 "12-Bit seq #", /* (18) */
204 "End-Disc", /* (19) */
205 "Proprietary", /* (20) */
206 "DCE-Id", /* (21) */
207 "MP+", /* (22) */
208 "Link-Disc", /* (23) */
209 "LCP-Auth-Opt", /* (24) */
210 "COBS", /* (25) */
211 "Prefix-elision", /* (26) */
212 "Multilink-header-Form",/* (27) */
213 "I18N", /* (28) */
214 "SDL-over-SONET/SDH", /* (29) */
215 "PPP-Muxing", /* (30) */
216 };
217
218 /* ECP - to be supported */
219
220 /* CCP Config Options */
221
222 #define CCPOPT_OUI 0 /* RFC1962 */
223 #define CCPOPT_PRED1 1 /* RFC1962 */
224 #define CCPOPT_PRED2 2 /* RFC1962 */
225 #define CCPOPT_PJUMP 3 /* RFC1962 */
226 /* 4-15 unassigned */
227 #define CCPOPT_HPPPC 16 /* RFC1962 */
228 #define CCPOPT_STACLZS 17 /* RFC1974 */
229 #define CCPOPT_MPPC 18 /* RFC2118 */
230 #define CCPOPT_GFZA 19 /* RFC1962 */
231 #define CCPOPT_V42BIS 20 /* RFC1962 */
232 #define CCPOPT_BSDCOMP 21 /* RFC1977 */
233 /* 22 unassigned */
234 #define CCPOPT_LZSDCP 23 /* RFC1967 */
235 #define CCPOPT_MVRCA 24 /* RFC1975 */
236 #define CCPOPT_DEC 25 /* RFC1976 */
237 #define CCPOPT_DEFLATE 26 /* RFC1979 */
238 /* 27-254 unassigned */
239 #define CCPOPT_RESV 255 /* RFC1962 */
240
241 static const struct tok ccpconfopts_values[] = {
242 { CCPOPT_OUI, "OUI" },
243 { CCPOPT_PRED1, "Pred-1" },
244 { CCPOPT_PRED2, "Pred-2" },
245 { CCPOPT_PJUMP, "Puddle" },
246 { CCPOPT_HPPPC, "HP-PPC" },
247 { CCPOPT_STACLZS, "Stac-LZS" },
248 { CCPOPT_MPPC, "MPPC" },
249 { CCPOPT_GFZA, "Gand-FZA" },
250 { CCPOPT_V42BIS, "V.42bis" },
251 { CCPOPT_BSDCOMP, "BSD-Comp" },
252 { CCPOPT_LZSDCP, "LZS-DCP" },
253 { CCPOPT_MVRCA, "MVRCA" },
254 { CCPOPT_DEC, "DEC" },
255 { CCPOPT_DEFLATE, "Deflate" },
256 { CCPOPT_RESV, "Reserved"},
257 {0, NULL}
258 };
259
260 /* BACP Config Options */
261
262 #define BACPOPT_FPEER 1 /* RFC2125 */
263
264 static const struct tok bacconfopts_values[] = {
265 { BACPOPT_FPEER, "Favored-Peer" },
266 {0, NULL}
267 };
268
269
270 /* SDCP - to be supported */
271
272 /* IPCP Config Options */
273 #define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */
274 #define IPCPOPT_IPCOMP 2 /* RFC1332 */
275 #define IPCPOPT_ADDR 3 /* RFC1332 */
276 #define IPCPOPT_MOBILE4 4 /* RFC2290 */
277 #define IPCPOPT_PRIDNS 129 /* RFC1877 */
278 #define IPCPOPT_PRINBNS 130 /* RFC1877 */
279 #define IPCPOPT_SECDNS 131 /* RFC1877 */
280 #define IPCPOPT_SECNBNS 132 /* RFC1877 */
281
282 static const struct tok ipcpopt_values[] = {
283 { IPCPOPT_2ADDR, "IP-Addrs" },
284 { IPCPOPT_IPCOMP, "IP-Comp" },
285 { IPCPOPT_ADDR, "IP-Addr" },
286 { IPCPOPT_MOBILE4, "Home-Addr" },
287 { IPCPOPT_PRIDNS, "Pri-DNS" },
288 { IPCPOPT_PRINBNS, "Pri-NBNS" },
289 { IPCPOPT_SECDNS, "Sec-DNS" },
290 { IPCPOPT_SECNBNS, "Sec-NBNS" },
291 { 0, NULL }
292 };
293
294 #define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */
295 #define IPCPOPT_IPCOMP_MINLEN 14
296
297 static const struct tok ipcpopt_compproto_values[] = {
298 { PPP_VJC, "VJ-Comp" },
299 { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" },
300 { 0, NULL }
301 };
302
303 static const struct tok ipcpopt_compproto_subopt_values[] = {
304 { 1, "RTP-Compression" },
305 { 2, "Enhanced RTP-Compression" },
306 { 0, NULL }
307 };
308
309 /* IP6CP Config Options */
310 #define IP6CP_IFID 1
311
312 static const struct tok ip6cpopt_values[] = {
313 { IP6CP_IFID, "Interface-ID" },
314 { 0, NULL }
315 };
316
317 /* ATCP - to be supported */
318 /* OSINLCP - to be supported */
319 /* BVCP - to be supported */
320 /* BCP - to be supported */
321 /* IPXCP - to be supported */
322 /* MPLSCP - to be supported */
323
324 /* Auth Algorithms */
325
326 /* 0-4 Reserved (RFC1994) */
327 #define AUTHALG_CHAPMD5 5 /* RFC1994 */
328 #define AUTHALG_MSCHAP1 128 /* RFC2433 */
329 #define AUTHALG_MSCHAP2 129 /* RFC2795 */
330
331 static const struct tok authalg_values[] = {
332 { AUTHALG_CHAPMD5, "MD5" },
333 { AUTHALG_MSCHAP1, "MS-CHAPv1" },
334 { AUTHALG_MSCHAP2, "MS-CHAPv2" },
335 { 0, NULL }
336 };
337
338 /* FCS Alternatives - to be supported */
339
340 /* Multilink Endpoint Discriminator (RFC1717) */
341 #define MEDCLASS_NULL 0 /* Null Class */
342 #define MEDCLASS_LOCAL 1 /* Locally Assigned */
343 #define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */
344 #define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */
345 #define MEDCLASS_MNB 4 /* PPP Magic Number Block */
346 #define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */
347
348 /* PPP LCP Callback */
349 #define CALLBACK_AUTH 0 /* Location determined by user auth */
350 #define CALLBACK_DSTR 1 /* Dialing string */
351 #define CALLBACK_LID 2 /* Location identifier */
352 #define CALLBACK_E164 3 /* E.164 number */
353 #define CALLBACK_X500 4 /* X.500 distinguished name */
354 #define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */
355
356 static const struct tok ppp_callback_values[] = {
357 { CALLBACK_AUTH, "UserAuth" },
358 { CALLBACK_DSTR, "DialString" },
359 { CALLBACK_LID, "LocalID" },
360 { CALLBACK_E164, "E.164" },
361 { CALLBACK_X500, "X.500" },
362 { CALLBACK_CBCP, "CBCP" },
363 { 0, NULL }
364 };
365
366 /* CHAP */
367
368 #define CHAP_CHAL 1
369 #define CHAP_RESP 2
370 #define CHAP_SUCC 3
371 #define CHAP_FAIL 4
372
373 static const struct tok chapcode_values[] = {
374 { CHAP_CHAL, "Challenge" },
375 { CHAP_RESP, "Response" },
376 { CHAP_SUCC, "Success" },
377 { CHAP_FAIL, "Fail" },
378 { 0, NULL}
379 };
380
381 /* PAP */
382
383 #define PAP_AREQ 1
384 #define PAP_AACK 2
385 #define PAP_ANAK 3
386
387 static const struct tok papcode_values[] = {
388 { PAP_AREQ, "Auth-Req" },
389 { PAP_AACK, "Auth-ACK" },
390 { PAP_ANAK, "Auth-NACK" },
391 { 0, NULL }
392 };
393
394 /* BAP */
395 #define BAP_CALLREQ 1
396 #define BAP_CALLRES 2
397 #define BAP_CBREQ 3
398 #define BAP_CBRES 4
399 #define BAP_LDQREQ 5
400 #define BAP_LDQRES 6
401 #define BAP_CSIND 7
402 #define BAP_CSRES 8
403
404 static void handle_ctrl_proto (u_int proto,const u_char *p, int length);
405 static void handle_chap (const u_char *p, int length);
406 static void handle_pap (const u_char *p, int length);
407 static void handle_bap (const u_char *p, int length);
408 static void handle_mlppp(const u_char *p, int length);
409 static int print_lcp_config_options (const u_char *p, int);
410 static int print_ipcp_config_options (const u_char *p, int);
411 static int print_ip6cp_config_options (const u_char *p, int);
412 static int print_ccp_config_options (const u_char *p, int);
413 static int print_bacp_config_options (const u_char *p, int);
414 static void handle_ppp (u_int proto, const u_char *p, int length);
415 static void ppp_hdlc(const u_char *p, int length);
416
417 /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
418 static void
419 handle_ctrl_proto(u_int proto, const u_char *pptr, int length)
420 {
421 const char *typestr;
422 u_int code, len;
423 int (*pfunc)(const u_char *, int);
424 int x, j;
425 const u_char *tptr;
426
427 tptr=pptr;
428
429 typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto);
430 printf("%s, ",typestr);
431
432 if (length < 4) /* FIXME weak boundary checking */
433 goto trunc;
434 TCHECK2(*tptr, 2);
435
436 code = *tptr++;
437
438 printf("%s (0x%02x), id %u, length %u",
439 tok2str(cpcodes, "Unknown Opcode",code),
440 code,
441 *tptr++, /* ID */
442 length+2);
443
444 if (!vflag)
445 return;
446
447 if (length <= 4)
448 return; /* there may be a NULL confreq etc. */
449
450 TCHECK2(*tptr, 2);
451 len = EXTRACT_16BITS(tptr);
452 tptr += 2;
453
454 printf("\n\tencoded length %u (=Option(s) length %u)",len,len-4);
455
456 if (vflag>1)
457 print_unknown_data(gndo,pptr-2,"\n\t",6);
458
459
460 switch (code) {
461 case CPCODES_VEXT:
462 if (length < 11)
463 break;
464 TCHECK2(*tptr, 4);
465 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
466 tptr += 4;
467 TCHECK2(*tptr, 3);
468 printf(" Vendor: %s (%u)",
469 tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)),
470 EXTRACT_24BITS(tptr));
471 /* XXX: need to decode Kind and Value(s)? */
472 break;
473 case CPCODES_CONF_REQ:
474 case CPCODES_CONF_ACK:
475 case CPCODES_CONF_NAK:
476 case CPCODES_CONF_REJ:
477 x = len - 4; /* Code(1), Identifier(1) and Length(2) */
478 do {
479 switch (proto) {
480 case PPP_LCP:
481 pfunc = print_lcp_config_options;
482 break;
483 case PPP_IPCP:
484 pfunc = print_ipcp_config_options;
485 break;
486 case PPP_IPV6CP:
487 pfunc = print_ip6cp_config_options;
488 break;
489 case PPP_CCP:
490 pfunc = print_ccp_config_options;
491 break;
492 case PPP_BACP:
493 pfunc = print_bacp_config_options;
494 break;
495 default:
496 /*
497 * No print routine for the options for
498 * this protocol.
499 */
500 pfunc = NULL;
501 break;
502 }
503
504 if (pfunc == NULL) /* catch the above null pointer if unknown CP */
505 break;
506
507 if ((j = (*pfunc)(tptr, len)) == 0)
508 break;
509 x -= j;
510 tptr += j;
511 } while (x > 0);
512 break;
513
514 case CPCODES_TERM_REQ:
515 case CPCODES_TERM_ACK:
516 /* XXX: need to decode Data? */
517 break;
518 case CPCODES_CODE_REJ:
519 /* XXX: need to decode Rejected-Packet? */
520 break;
521 case CPCODES_PROT_REJ:
522 if (length < 6)
523 break;
524 TCHECK2(*tptr, 2);
525 printf("\n\t Rejected %s Protocol (0x%04x)",
526 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
527 EXTRACT_16BITS(tptr));
528 /* XXX: need to decode Rejected-Information? - hexdump for now */
529 if (len > 6) {
530 printf("\n\t Rejected Packet");
531 print_unknown_data(gndo,tptr+2,"\n\t ",len-2);
532 }
533 break;
534 case CPCODES_ECHO_REQ:
535 case CPCODES_ECHO_RPL:
536 case CPCODES_DISC_REQ:
537 if (length < 8)
538 break;
539 TCHECK2(*tptr, 4);
540 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
541 /* XXX: need to decode Data? - hexdump for now */
542 if (len > 8) {
543 printf("\n\t -----trailing data-----");
544 TCHECK2(tptr[4], len-8);
545 print_unknown_data(gndo,tptr+4,"\n\t ",len-8);
546 }
547 break;
548 case CPCODES_ID:
549 if (length < 8)
550 break;
551 TCHECK2(*tptr, 4);
552 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
553 /* RFC 1661 says this is intended to be human readable */
554 if (len > 8) {
555 printf("\n\t Message\n\t ");
556 fn_printn(tptr+4,len-4,snapend);
557 }
558 break;
559 case CPCODES_TIME_REM:
560 if (length < 12)
561 break;
562 TCHECK2(*tptr, 4);
563 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr));
564 TCHECK2(*(tptr + 4), 4);
565 printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4));
566 /* XXX: need to decode Message? */
567 break;
568 default:
569 /* XXX this is dirty but we do not get the
570 * original pointer passed to the begin
571 * the PPP packet */
572 if (vflag <= 1)
573 print_unknown_data(gndo,pptr-2,"\n\t ",length+2);
574 break;
575 }
576 return;
577
578 trunc:
579 printf("[|%s]", typestr);
580 }
581
582 /* LCP config options */
583 static int
584 print_lcp_config_options(const u_char *p, int length)
585 {
586 int len, opt;
587
588 if (length < 2)
589 return 0;
590 TCHECK2(*p, 2);
591 len = p[1];
592 opt = p[0];
593 if (length < len)
594 return 0;
595 if (len < 2) {
596 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
597 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", lcpconfopts[opt],opt,len);
598 else
599 printf("\n\tunknown LCP option 0x%02x", opt);
600 return 0;
601 }
602 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
603 printf("\n\t %s Option (0x%02x), length %u: ", lcpconfopts[opt],opt,len);
604 else {
605 printf("\n\tunknown LCP option 0x%02x", opt);
606 return len;
607 }
608
609 switch (opt) {
610 case LCPOPT_VEXT:
611 if (len >= 6) {
612 TCHECK2(*(p + 2), 3);
613 printf("Vendor: %s (%u)",
614 tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)),
615 EXTRACT_24BITS(p+2));
616 #if 0
617 TCHECK(p[5]);
618 printf(", kind: 0x%02x", p[5]);
619 printf(", Value: 0x")
620 for (i = 0; i < len - 6; i++) {
621 TCHECK(p[6 + i]);
622 printf("%02x", p[6 + i]);
623 }
624 #endif
625 }
626 break;
627 case LCPOPT_MRU:
628 if (len == 4) {
629 TCHECK2(*(p + 2), 2);
630 printf("%u", EXTRACT_16BITS(p + 2));
631 }
632 break;
633 case LCPOPT_ACCM:
634 if (len == 6) {
635 TCHECK2(*(p + 2), 4);
636 printf("0x%08x", EXTRACT_32BITS(p + 2));
637 }
638 break;
639 case LCPOPT_AP:
640 if (len >= 4) {
641 TCHECK2(*(p + 2), 2);
642 printf("%s", tok2str(ppptype2str,"Unknown Auth Proto (0x04x)",EXTRACT_16BITS(p+2)));
643
644 switch (EXTRACT_16BITS(p+2)) {
645 case PPP_CHAP:
646 TCHECK(p[4]);
647 printf(", %s",tok2str(authalg_values,"Unknown Auth Alg %u",p[4]));
648 break;
649 case PPP_PAP: /* fall through */
650 case PPP_EAP:
651 case PPP_SPAP:
652 case PPP_SPAP_OLD:
653 break;
654 default:
655 print_unknown_data(gndo,p,"\n\t",len);
656 }
657 }
658 break;
659 case LCPOPT_QP:
660 if (len >= 4) {
661 TCHECK2(*(p + 2), 2);
662 if (EXTRACT_16BITS(p+2) == PPP_LQM)
663 printf(" LQR");
664 else
665 printf(" unknown");
666 }
667 break;
668 case LCPOPT_MN:
669 if (len == 6) {
670 TCHECK2(*(p + 2), 4);
671 printf("0x%08x", EXTRACT_32BITS(p + 2));
672 }
673 break;
674 case LCPOPT_PFC:
675 break;
676 case LCPOPT_ACFC:
677 break;
678 case LCPOPT_LD:
679 if (len == 4) {
680 TCHECK2(*(p + 2), 2);
681 printf("0x%04x", EXTRACT_16BITS(p + 2));
682 }
683 break;
684 case LCPOPT_CBACK:
685 if (len < 3)
686 break;
687 TCHECK(p[2]);
688 printf("Callback Operation %s (%u)",
689 tok2str(ppp_callback_values,"Unknown",p[2]),
690 p[2]);
691 break;
692 case LCPOPT_MLMRRU:
693 if (len == 4) {
694 TCHECK2(*(p + 2), 2);
695 printf("%u", EXTRACT_16BITS(p + 2));
696 }
697 break;
698 case LCPOPT_MLED:
699 if (len < 3)
700 break;
701 TCHECK(p[2]);
702 switch (p[2]) { /* class */
703 case MEDCLASS_NULL:
704 printf("Null");
705 break;
706 case MEDCLASS_LOCAL:
707 printf("Local"); /* XXX */
708 break;
709 case MEDCLASS_IPV4:
710 if (len != 7)
711 break;
712 TCHECK2(*(p + 3), 4);
713 printf("IPv4 %s", ipaddr_string(p + 3));
714 break;
715 case MEDCLASS_MAC:
716 if (len != 9)
717 break;
718 TCHECK(p[8]);
719 printf("MAC %02x:%02x:%02x:%02x:%02x:%02x",
720 p[3], p[4], p[5], p[6], p[7], p[8]);
721 break;
722 case MEDCLASS_MNB:
723 printf("Magic-Num-Block"); /* XXX */
724 break;
725 case MEDCLASS_PSNDN:
726 printf("PSNDN"); /* XXX */
727 break;
728 }
729 break;
730
731 /* XXX: to be supported */
732 #if 0
733 case LCPOPT_DEP6:
734 case LCPOPT_FCSALT:
735 case LCPOPT_SDP:
736 case LCPOPT_NUMMODE:
737 case LCPOPT_DEP12:
738 case LCPOPT_DEP14:
739 case LCPOPT_DEP15:
740 case LCPOPT_DEP16:
741 case LCPOPT_MLSSNHF:
742 case LCPOPT_PROP:
743 case LCPOPT_DCEID:
744 case LCPOPT_MPP:
745 case LCPOPT_LCPAOPT:
746 case LCPOPT_COBS:
747 case LCPOPT_PE:
748 case LCPOPT_MLHF:
749 case LCPOPT_I18N:
750 case LCPOPT_SDLOS:
751 case LCPOPT_PPPMUX:
752 break;
753 #endif
754 default:
755 if(vflag<2)
756 print_unknown_data(gndo,&p[2],"\n\t ",len-2);
757 break;
758 }
759
760 if (vflag>1)
761 print_unknown_data(gndo,&p[2],"\n\t ",len-2); /* exclude TLV header */
762
763 return len;
764
765 trunc:
766 printf("[|lcp]");
767 return 0;
768 }
769
770 /* ML-PPP*/
771 static const struct tok ppp_ml_flag_values[] = {
772 { 0x80, "begin" },
773 { 0x40, "end" },
774 { 0, NULL }
775 };
776
777 static void
778 handle_mlppp(const u_char *p, int length) {
779
780 if (!eflag)
781 printf("MLPPP, ");
782
783 printf("seq 0x%03x, Flags [%s], length %u",
784 (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */
785 bittok2str(ppp_ml_flag_values, "none", *p & 0xc0),
786 length);
787
788 return;
789 }
790
791 /* CHAP */
792 static void
793 handle_chap(const u_char *p, int length)
794 {
795 u_int code, len;
796 int val_size, name_size, msg_size;
797 const u_char *p0;
798 int i;
799
800 p0 = p;
801 if (length < 1) {
802 printf("[|chap]");
803 return;
804 } else if (length < 4) {
805 TCHECK(*p);
806 printf("[|chap 0x%02x]", *p);
807 return;
808 }
809
810 TCHECK(*p);
811 code = *p;
812 printf("CHAP, %s (0x%02x)",
813 tok2str(chapcode_values,"unknown",code),
814 code);
815 p++;
816
817 TCHECK(*p);
818 printf(", id %u", *p); /* ID */
819 p++;
820
821 TCHECK2(*p, 2);
822 len = EXTRACT_16BITS(p);
823 p += 2;
824
825 /*
826 * Note that this is a generic CHAP decoding routine. Since we
827 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
828 * MS-CHAPv2) is used at this point, we can't decode packet
829 * specifically to each algorithms. Instead, we simply decode
830 * the GCD (Gratest Common Denominator) for all algorithms.
831 */
832 switch (code) {
833 case CHAP_CHAL:
834 case CHAP_RESP:
835 if (length - (p - p0) < 1)
836 return;
837 TCHECK(*p);
838 val_size = *p; /* value size */
839 p++;
840 if (length - (p - p0) < val_size)
841 return;
842 printf(", Value ");
843 for (i = 0; i < val_size; i++) {
844 TCHECK(*p);
845 printf("%02x", *p++);
846 }
847 name_size = len - (p - p0);
848 printf(", Name ");
849 for (i = 0; i < name_size; i++) {
850 TCHECK(*p);
851 safeputchar(*p++);
852 }
853 break;
854 case CHAP_SUCC:
855 case CHAP_FAIL:
856 msg_size = len - (p - p0);
857 printf(", Msg ");
858 for (i = 0; i< msg_size; i++) {
859 TCHECK(*p);
860 safeputchar(*p++);
861 }
862 break;
863 }
864 return;
865
866 trunc:
867 printf("[|chap]");
868 }
869
870 /* PAP (see RFC 1334) */
871 static void
872 handle_pap(const u_char *p, int length)
873 {
874 u_int code, len;
875 int peerid_len, passwd_len, msg_len;
876 const u_char *p0;
877 int i;
878
879 p0 = p;
880 if (length < 1) {
881 printf("[|pap]");
882 return;
883 } else if (length < 4) {
884 TCHECK(*p);
885 printf("[|pap 0x%02x]", *p);
886 return;
887 }
888
889 TCHECK(*p);
890 code = *p;
891 printf("PAP, %s (0x%02x)",
892 tok2str(papcode_values,"unknown",code),
893 code);
894 p++;
895
896 TCHECK(*p);
897 printf(", id %u", *p); /* ID */
898 p++;
899
900 TCHECK2(*p, 2);
901 len = EXTRACT_16BITS(p);
902 p += 2;
903
904 if ((int)len > length) {
905 printf(", length %u > packet size", len);
906 return;
907 }
908 length = len;
909 if (length < (p - p0)) {
910 printf(", length %u < PAP header length", length);
911 return;
912 }
913
914 switch (code) {
915 case PAP_AREQ:
916 if (length - (p - p0) < 1)
917 return;
918 TCHECK(*p);
919 peerid_len = *p; /* Peer-ID Length */
920 p++;
921 if (length - (p - p0) < peerid_len)
922 return;
923 printf(", Peer ");
924 for (i = 0; i < peerid_len; i++) {
925 TCHECK(*p);
926 safeputchar(*p++);
927 }
928
929 if (length - (p - p0) < 1)
930 return;
931 TCHECK(*p);
932 passwd_len = *p; /* Password Length */
933 p++;
934 if (length - (p - p0) < passwd_len)
935 return;
936 printf(", Name ");
937 for (i = 0; i < passwd_len; i++) {
938 TCHECK(*p);
939 safeputchar(*p++);
940 }
941 break;
942 case PAP_AACK:
943 case PAP_ANAK:
944 if (length - (p - p0) < 1)
945 return;
946 TCHECK(*p);
947 msg_len = *p; /* Msg-Length */
948 p++;
949 if (length - (p - p0) < msg_len)
950 return;
951 printf(", Msg ");
952 for (i = 0; i< msg_len; i++) {
953 TCHECK(*p);
954 safeputchar(*p++);
955 }
956 break;
957 }
958 return;
959
960 trunc:
961 printf("[|pap]");
962 }
963
964 /* BAP */
965 static void
966 handle_bap(const u_char *p _U_, int length _U_)
967 {
968 /* XXX: to be supported!! */
969 }
970
971
972 /* IPCP config options */
973 static int
974 print_ipcp_config_options(const u_char *p, int length)
975 {
976 int len, opt;
977 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
978
979 if (length < 2)
980 return 0;
981 TCHECK2(*p, 2);
982 len = p[1];
983 opt = p[0];
984 if (length < len)
985 return 0;
986 if (len < 2) {
987 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
988 tok2str(ipcpopt_values,"unknown",opt),
989 opt,
990 len);
991 return 0;
992 }
993
994 printf("\n\t %s Option (0x%02x), length %u: ",
995 tok2str(ipcpopt_values,"unknown",opt),
996 opt,
997 len);
998
999 switch (opt) {
1000 case IPCPOPT_2ADDR: /* deprecated */
1001 if (len != 10)
1002 goto invlen;
1003 TCHECK2(*(p + 6), 4);
1004 printf("src %s, dst %s",
1005 ipaddr_string(p + 2),
1006 ipaddr_string(p + 6));
1007 break;
1008 case IPCPOPT_IPCOMP:
1009 if (len < 4)
1010 goto invlen;
1011 TCHECK2(*(p + 2), 2);
1012 compproto = EXTRACT_16BITS(p+2);
1013
1014 printf("%s (0x%02x):",
1015 tok2str(ipcpopt_compproto_values,"Unknown",compproto),
1016 compproto);
1017
1018 switch (compproto) {
1019 case PPP_VJC:
1020 /* XXX: VJ-Comp parameters should be decoded */
1021 break;
1022 case IPCPOPT_IPCOMP_HDRCOMP:
1023 if (len < IPCPOPT_IPCOMP_MINLEN)
1024 goto invlen;
1025
1026 TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN);
1027 printf("\n\t TCP Space %u, non-TCP Space %u" \
1028 ", maxPeriod %u, maxTime %u, maxHdr %u",
1029 EXTRACT_16BITS(p+4),
1030 EXTRACT_16BITS(p+6),
1031 EXTRACT_16BITS(p+8),
1032 EXTRACT_16BITS(p+10),
1033 EXTRACT_16BITS(p+12));
1034
1035 /* suboptions present ? */
1036 if (len > IPCPOPT_IPCOMP_MINLEN) {
1037 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
1038 p += IPCPOPT_IPCOMP_MINLEN;
1039
1040 printf("\n\t Suboptions, length %u", ipcomp_subopttotallen);
1041
1042 while (ipcomp_subopttotallen >= 2) {
1043 TCHECK2(*p, 2);
1044 ipcomp_subopt = *p;
1045 ipcomp_suboptlen = *(p+1);
1046
1047 /* sanity check */
1048 if (ipcomp_subopt == 0 ||
1049 ipcomp_suboptlen == 0 )
1050 break;
1051
1052 /* XXX: just display the suboptions for now */
1053 printf("\n\t\t%s Suboption #%u, length %u",
1054 tok2str(ipcpopt_compproto_subopt_values,
1055 "Unknown",
1056 ipcomp_subopt),
1057 ipcomp_subopt,
1058 ipcomp_suboptlen);
1059
1060 ipcomp_subopttotallen -= ipcomp_suboptlen;
1061 p += ipcomp_suboptlen;
1062 }
1063 }
1064 break;
1065 default:
1066 break;
1067 }
1068 break;
1069
1070 case IPCPOPT_ADDR: /* those options share the same format - fall through */
1071 case IPCPOPT_MOBILE4:
1072 case IPCPOPT_PRIDNS:
1073 case IPCPOPT_PRINBNS:
1074 case IPCPOPT_SECDNS:
1075 case IPCPOPT_SECNBNS:
1076 if (len != 6)
1077 goto invlen;
1078 TCHECK2(*(p + 2), 4);
1079 printf("%s", ipaddr_string(p + 2));
1080 break;
1081 default:
1082 if(vflag<2)
1083 print_unknown_data(gndo,&p[2],"\n\t ",len-2);
1084 break;
1085 }
1086 if (vflag>1)
1087 print_unknown_data(gndo,&p[2],"\n\t ",len-2); /* exclude TLV header */
1088 return len;
1089
1090 invlen:
1091 printf(", invalid-length-%d", opt);
1092 return 0;
1093
1094 trunc:
1095 printf("[|ipcp]");
1096 return 0;
1097 }
1098
1099 /* IP6CP config options */
1100 static int
1101 print_ip6cp_config_options(const u_char *p, int length)
1102 {
1103 int len, opt;
1104
1105 if (length < 2)
1106 return 0;
1107 TCHECK2(*p, 2);
1108 len = p[1];
1109 opt = p[0];
1110 if (length < len)
1111 return 0;
1112 if (len < 2) {
1113 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
1114 tok2str(ip6cpopt_values,"unknown",opt),
1115 opt,
1116 len);
1117 return 0;
1118 }
1119
1120 printf("\n\t %s Option (0x%02x), length %u: ",
1121 tok2str(ip6cpopt_values,"unknown",opt),
1122 opt,
1123 len);
1124
1125 switch (opt) {
1126 case IP6CP_IFID:
1127 if (len != 10)
1128 goto invlen;
1129 TCHECK2(*(p + 2), 8);
1130 printf("%04x:%04x:%04x:%04x",
1131 EXTRACT_16BITS(p + 2),
1132 EXTRACT_16BITS(p + 4),
1133 EXTRACT_16BITS(p + 6),
1134 EXTRACT_16BITS(p + 8));
1135 break;
1136 default:
1137 if(vflag<2)
1138 print_unknown_data(gndo,&p[2],"\n\t ",len-2);
1139 break;
1140 }
1141 if (vflag>1)
1142 print_unknown_data(gndo,&p[2],"\n\t ",len-2); /* exclude TLV header */
1143
1144 return len;
1145
1146 invlen:
1147 printf(", invalid-length-%d", opt);
1148 return 0;
1149
1150 trunc:
1151 printf("[|ip6cp]");
1152 return 0;
1153 }
1154
1155
1156 /* CCP config options */
1157 static int
1158 print_ccp_config_options(const u_char *p, int length)
1159 {
1160 int len, opt;
1161
1162 if (length < 2)
1163 return 0;
1164 TCHECK2(*p, 2);
1165 len = p[1];
1166 opt = p[0];
1167 if (length < len)
1168 return 0;
1169 if (len < 2) {
1170 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
1171 tok2str(ccpconfopts_values, "Unknown", opt),
1172 opt,
1173 len);
1174 return 0;
1175 }
1176
1177 printf("\n\t %s Option (0x%02x), length %u:",
1178 tok2str(ccpconfopts_values, "Unknown", opt),
1179 opt,
1180 len);
1181
1182 switch (opt) {
1183 /* fall through --> default: nothing supported yet */
1184 case CCPOPT_OUI:
1185 case CCPOPT_PRED1:
1186 case CCPOPT_PRED2:
1187 case CCPOPT_PJUMP:
1188 case CCPOPT_HPPPC:
1189 case CCPOPT_STACLZS:
1190 case CCPOPT_MPPC:
1191 case CCPOPT_GFZA:
1192 case CCPOPT_V42BIS:
1193 case CCPOPT_BSDCOMP:
1194 case CCPOPT_LZSDCP:
1195 case CCPOPT_MVRCA:
1196 case CCPOPT_DEC:
1197 case CCPOPT_DEFLATE:
1198 case CCPOPT_RESV:
1199 default:
1200 if(vflag<2)
1201 print_unknown_data(gndo,&p[2],"\n\t ",len-2);
1202 break;
1203 }
1204 if (vflag>1)
1205 print_unknown_data(gndo,&p[2],"\n\t ",len-2); /* exclude TLV header */
1206
1207 return len;
1208
1209 trunc:
1210 printf("[|ccp]");
1211 return 0;
1212 }
1213
1214 /* BACP config options */
1215 static int
1216 print_bacp_config_options(const u_char *p, int length)
1217 {
1218 int len, opt;
1219
1220 if (length < 2)
1221 return 0;
1222 TCHECK2(*p, 2);
1223 len = p[1];
1224 opt = p[0];
1225 if (length < len)
1226 return 0;
1227 if (len < 2) {
1228 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)",
1229 tok2str(bacconfopts_values, "Unknown", opt),
1230 opt,
1231 len);
1232 return 0;
1233 }
1234
1235 printf("\n\t %s Option (0x%02x), length %u:",
1236 tok2str(bacconfopts_values, "Unknown", opt),
1237 opt,
1238 len);
1239
1240 switch (opt) {
1241 case BACPOPT_FPEER:
1242 TCHECK2(*(p + 2), 4);
1243 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2));
1244 break;
1245 default:
1246 if(vflag<2)
1247 print_unknown_data(gndo,&p[2],"\n\t ",len-2);
1248 break;
1249 }
1250 if (vflag>1)
1251 print_unknown_data(gndo,&p[2],"\n\t ",len-2); /* exclude TLV header */
1252
1253 return len;
1254
1255 trunc:
1256 printf("[|bacp]");
1257 return 0;
1258 }
1259
1260
1261 static void
1262 ppp_hdlc(const u_char *p, int length)
1263 {
1264 u_char *b, *s, *t, c;
1265 int i, proto;
1266 const void *se;
1267
1268 if (length <= 0)
1269 return;
1270
1271 b = (u_int8_t *)malloc(length);
1272 if (b == NULL)
1273 return;
1274
1275 /*
1276 * Unescape all the data into a temporary, private, buffer.
1277 * Do this so that we dont overwrite the original packet
1278 * contents.
1279 */
1280 for (s = (u_char *)p, t = b, i = length; i > 0; i--) {
1281 c = *s++;
1282 if (c == 0x7d) {
1283 if (i > 1) {
1284 i--;
1285 c = *s++ ^ 0x20;
1286 } else
1287 continue;
1288 }
1289 *t++ = c;
1290 }
1291
1292 se = snapend;
1293 snapend = t;
1294 length = t - b;
1295
1296 /* now lets guess about the payload codepoint format */
1297 if (length < 1)
1298 goto trunc;
1299 proto = *b; /* start with a one-octet codepoint guess */
1300
1301 switch (proto) {
1302 case PPP_IP:
1303 ip_print(gndo, b+1, length - 1);
1304 goto cleanup;
1305 #ifdef INET6
1306 case PPP_IPV6:
1307 ip6_print(gndo, b+1, length - 1);
1308 goto cleanup;
1309 #endif
1310 default: /* no luck - try next guess */
1311 break;
1312 }
1313
1314 if (length < 2)
1315 goto trunc;
1316 proto = EXTRACT_16BITS(b); /* next guess - load two octets */
1317
1318 switch (proto) {
1319 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */
1320 if (length < 4)
1321 goto trunc;
1322 proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */
1323 handle_ppp(proto, b+4, length - 4);
1324 break;
1325 default: /* last guess - proto must be a PPP proto-id */
1326 handle_ppp(proto, b+2, length - 2);
1327 break;
1328 }
1329
1330 cleanup:
1331 snapend = se;
1332 free(b);
1333 return;
1334
1335 trunc:
1336 snapend = se;
1337 free(b);
1338 printf("[|ppp]");
1339 return;
1340 }
1341
1342
1343 /* PPP */
1344 static void
1345 handle_ppp(u_int proto, const u_char *p, int length)
1346 {
1347 if ((proto & 0xff00) == 0x7e00) {/* is this an escape code ? */
1348 ppp_hdlc(p-1, length);
1349 return;
1350 }
1351
1352 switch (proto) {
1353 case PPP_LCP: /* fall through */
1354 case PPP_IPCP:
1355 case PPP_OSICP:
1356 case PPP_MPLSCP:
1357 case PPP_IPV6CP:
1358 case PPP_CCP:
1359 case PPP_BACP:
1360 handle_ctrl_proto(proto, p, length);
1361 break;
1362 case PPP_ML:
1363 handle_mlppp(p, length);
1364 break;
1365 case PPP_CHAP:
1366 handle_chap(p, length);
1367 break;
1368 case PPP_PAP:
1369 handle_pap(p, length);
1370 break;
1371 case PPP_BAP: /* XXX: not yet completed */
1372 handle_bap(p, length);
1373 break;
1374 case ETHERTYPE_IP: /*XXX*/
1375 case PPP_VJNC:
1376 case PPP_IP:
1377 ip_print(gndo, p, length);
1378 break;
1379 #ifdef INET6
1380 case ETHERTYPE_IPV6: /*XXX*/
1381 case PPP_IPV6:
1382 ip6_print(gndo, p, length);
1383 break;
1384 #endif
1385 case ETHERTYPE_IPX: /*XXX*/
1386 case PPP_IPX:
1387 ipx_print(p, length);
1388 break;
1389 case PPP_OSI:
1390 isoclns_print(p, length, length);
1391 break;
1392 case PPP_MPLS_UCAST:
1393 case PPP_MPLS_MCAST:
1394 mpls_print(p, length);
1395 break;
1396 case PPP_COMP:
1397 printf("compressed PPP data");
1398 break;
1399 default:
1400 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1401 print_unknown_data(gndo,p,"\n\t",length);
1402 break;
1403 }
1404 }
1405
1406 /* Standard PPP printer */
1407 u_int
1408 ppp_print(register const u_char *p, u_int length)
1409 {
1410 u_int proto,ppp_header;
1411 u_int olen = length; /* _o_riginal length */
1412 u_int hdr_len = 0;
1413
1414 /*
1415 * Here, we assume that p points to the Address and Control
1416 * field (if they present).
1417 */
1418 if (length < 2)
1419 goto trunc;
1420 TCHECK2(*p, 2);
1421 ppp_header = EXTRACT_16BITS(p);
1422
1423 switch(ppp_header) {
1424 case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL):
1425 if (eflag) printf("In ");
1426 p += 2;
1427 length -= 2;
1428 hdr_len += 2;
1429 break;
1430 case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL):
1431 if (eflag) printf("Out ");
1432 p += 2;
1433 length -= 2;
1434 hdr_len += 2;
1435 break;
1436 case (PPP_ADDRESS << 8 | PPP_CONTROL):
1437 p += 2; /* ACFC not used */
1438 length -= 2;
1439 hdr_len += 2;
1440 break;
1441
1442 default:
1443 break;
1444 }
1445
1446 if (length < 2)
1447 goto trunc;
1448 TCHECK(*p);
1449 if (*p % 2) {
1450 proto = *p; /* PFC is used */
1451 p++;
1452 length--;
1453 hdr_len++;
1454 } else {
1455 TCHECK2(*p, 2);
1456 proto = EXTRACT_16BITS(p);
1457 p += 2;
1458 length -= 2;
1459 hdr_len += 2;
1460 }
1461
1462 if (eflag)
1463 printf("%s (0x%04x), length %u: ",
1464 tok2str(ppptype2str, "unknown", proto),
1465 proto,
1466 olen);
1467
1468 handle_ppp(proto, p, length);
1469 return (hdr_len);
1470 trunc:
1471 printf("[|ppp]");
1472 return (0);
1473 }
1474
1475
1476 /* PPP I/F printer */
1477 u_int
1478 ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1479 {
1480 register u_int length = h->len;
1481 register u_int caplen = h->caplen;
1482
1483 if (caplen < PPP_HDRLEN) {
1484 printf("[|ppp]");
1485 return (caplen);
1486 }
1487
1488 #if 0
1489 /*
1490 * XXX: seems to assume that there are 2 octets prepended to an
1491 * actual PPP frame. The 1st octet looks like Input/Output flag
1492 * while 2nd octet is unknown, at least to me
1493 * (mshindo@mshindo.net).
1494 *
1495 * That was what the original tcpdump code did.
1496 *
1497 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1498 * packets and 0 for inbound packets - but only if the
1499 * protocol field has the 0x8000 bit set (i.e., it's a network
1500 * control protocol); it does so before running the packet through
1501 * "bpf_filter" to see if it should be discarded, and to see
1502 * if we should update the time we sent the most recent packet...
1503 *
1504 * ...but it puts the original address field back after doing
1505 * so.
1506 *
1507 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1508 *
1509 * I don't know if any PPP implementation handed up to a BPF
1510 * device packets with the first octet being 1 for outbound and
1511 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1512 * whether that ever needs to be checked or not.
1513 *
1514 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1515 * and its tcpdump appears to assume that the frame always
1516 * begins with an address field and a control field, and that
1517 * the address field might be 0x0f or 0x8f, for Cisco
1518 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1519 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1520 * RFC 1662.
1521 *
1522 * (Is the Cisco framing in question what DLT_C_HDLC, in
1523 * BSD/OS, is?)
1524 */
1525 if (eflag)
1526 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]);
1527 #endif
1528
1529 ppp_print(p, length);
1530
1531 return (0);
1532 }
1533
1534 /*
1535 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1536 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1537 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1538 * discard them *if* those are the first two octets, and parse the remaining
1539 * packet as a PPP packet, as "ppp_print()" does).
1540 *
1541 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1542 */
1543 u_int
1544 ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
1545 {
1546 register u_int length = h->len;
1547 register u_int caplen = h->caplen;
1548 u_int proto;
1549 u_int hdrlen = 0;
1550
1551 if (caplen < 2) {
1552 printf("[|ppp]");
1553 return (caplen);
1554 }
1555
1556 switch (p[0]) {
1557
1558 case PPP_ADDRESS:
1559 if (caplen < 4) {
1560 printf("[|ppp]");
1561 return (caplen);
1562 }
1563
1564 if (eflag)
1565 printf("%02x %02x %d ", p[0], p[1], length);
1566 p += 2;
1567 length -= 2;
1568 hdrlen += 2;
1569
1570 proto = EXTRACT_16BITS(p);
1571 p += 2;
1572 length -= 2;
1573 hdrlen += 2;
1574 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1575
1576 handle_ppp(proto, p, length);
1577 break;
1578
1579 case CHDLC_UNICAST:
1580 case CHDLC_BCAST:
1581 return (chdlc_if_print(h, p));
1582
1583 default:
1584 if (eflag)
1585 printf("%02x %02x %d ", p[0], p[1], length);
1586 p += 2;
1587 length -= 2;
1588 hdrlen += 2;
1589
1590 /*
1591 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1592 * the next two octets as an Ethernet type; does that
1593 * ever happen?
1594 */
1595 printf("unknown addr %02x; ctrl %02x", p[0], p[1]);
1596 break;
1597 }
1598
1599 return (hdrlen);
1600 }
1601
1602 #define PPP_BSDI_HDRLEN 24
1603
1604 /* BSD/OS specific PPP printer */
1605 u_int
1606 ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1607 {
1608 register int hdrlength;
1609 #ifdef __bsdi__
1610 register u_int length = h->len;
1611 register u_int caplen = h->caplen;
1612 u_int16_t ptype;
1613 const u_char *q;
1614 int i;
1615
1616 if (caplen < PPP_BSDI_HDRLEN) {
1617 printf("[|ppp]");
1618 return (caplen)
1619 }
1620
1621 hdrlength = 0;
1622
1623 #if 0
1624 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1625 if (eflag)
1626 printf("%02x %02x ", p[0], p[1]);
1627 p += 2;
1628 hdrlength = 2;
1629 }
1630
1631 if (eflag)
1632 printf("%d ", length);
1633 /* Retrieve the protocol type */
1634 if (*p & 01) {
1635 /* Compressed protocol field */
1636 ptype = *p;
1637 if (eflag)
1638 printf("%02x ", ptype);
1639 p++;
1640 hdrlength += 1;
1641 } else {
1642 /* Un-compressed protocol field */
1643 ptype = EXTRACT_16BITS(p);
1644 if (eflag)
1645 printf("%04x ", ptype);
1646 p += 2;
1647 hdrlength += 2;
1648 }
1649 #else
1650 ptype = 0; /*XXX*/
1651 if (eflag)
1652 printf("%c ", p[SLC_DIR] ? 'O' : 'I');
1653 if (p[SLC_LLHL]) {
1654 /* link level header */
1655 struct ppp_header *ph;
1656
1657 q = p + SLC_BPFHDRLEN;
1658 ph = (struct ppp_header *)q;
1659 if (ph->phdr_addr == PPP_ADDRESS
1660 && ph->phdr_ctl == PPP_CONTROL) {
1661 if (eflag)
1662 printf("%02x %02x ", q[0], q[1]);
1663 ptype = EXTRACT_16BITS(&ph->phdr_type);
1664 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1665 printf("%s ", tok2str(ppptype2str,
1666 "proto-#%d", ptype));
1667 }
1668 } else {
1669 if (eflag) {
1670 printf("LLH=[");
1671 for (i = 0; i < p[SLC_LLHL]; i++)
1672 printf("%02x", q[i]);
1673 printf("] ");
1674 }
1675 }
1676 }
1677 if (eflag)
1678 printf("%d ", length);
1679 if (p[SLC_CHL]) {
1680 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1681
1682 switch (ptype) {
1683 case PPP_VJC:
1684 ptype = vjc_print(q, ptype);
1685 hdrlength = PPP_BSDI_HDRLEN;
1686 p += hdrlength;
1687 switch (ptype) {
1688 case PPP_IP:
1689 ip_print(gndo, p, length);
1690 break;
1691 #ifdef INET6
1692 case PPP_IPV6:
1693 ip6_print(gndo, p, length);
1694 break;
1695 #endif
1696 case PPP_MPLS_UCAST:
1697 case PPP_MPLS_MCAST:
1698 mpls_print(p, length);
1699 break;
1700 }
1701 goto printx;
1702 case PPP_VJNC:
1703 ptype = vjc_print(q, ptype);
1704 hdrlength = PPP_BSDI_HDRLEN;
1705 p += hdrlength;
1706 switch (ptype) {
1707 case PPP_IP:
1708 ip_print(gndo, p, length);
1709 break;
1710 #ifdef INET6
1711 case PPP_IPV6:
1712 ip6_print(gndo, p, length);
1713 break;
1714 #endif
1715 case PPP_MPLS_UCAST:
1716 case PPP_MPLS_MCAST:
1717 mpls_print(p, length);
1718 break;
1719 }
1720 goto printx;
1721 default:
1722 if (eflag) {
1723 printf("CH=[");
1724 for (i = 0; i < p[SLC_LLHL]; i++)
1725 printf("%02x", q[i]);
1726 printf("] ");
1727 }
1728 break;
1729 }
1730 }
1731
1732 hdrlength = PPP_BSDI_HDRLEN;
1733 #endif
1734
1735 length -= hdrlength;
1736 p += hdrlength;
1737
1738 switch (ptype) {
1739 case PPP_IP:
1740 ip_print(p, length);
1741 break;
1742 #ifdef INET6
1743 case PPP_IPV6:
1744 ip6_print(gndo, p, length);
1745 break;
1746 #endif
1747 case PPP_MPLS_UCAST:
1748 case PPP_MPLS_MCAST:
1749 mpls_print(gndo, p, length);
1750 break;
1751 default:
1752 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1753 }
1754
1755 printx:
1756 #else /* __bsdi */
1757 hdrlength = 0;
1758 #endif /* __bsdi__ */
1759 return (hdrlength);
1760 }
1761
1762
1763 /*
1764 * Local Variables:
1765 * c-style: whitesmith
1766 * c-basic-offset: 8
1767 * End:
1768 */
[mirror] the TCPdump network dissector