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 33static const char rcsid[] _U_ = 34 "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.114 2005-12-05 11:35:58 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#include <stdlib.h> 51 52#include "interface.h" 53#include "extract.h" 54#include "addrtoname.h" 55#include "ppp.h" 56#include "chdlc.h" 57#include "ethertype.h" 58#include "oui.h" 59 60/* 61 * The following constatns are defined by IANA. Please refer to 62 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers 63 * for the up-to-date information. 64 */ 65 66/* Protocol Codes defined in ppp.h */ 67 68struct tok ppptype2str[] = { 69 { PPP_IP, "IP" }, 70 { PPP_OSI, "OSI" }, 71 { PPP_NS, "NS" }, 72 { PPP_DECNET, "DECNET" }, 73 { PPP_APPLE, "APPLE" }, 74 { PPP_IPX, "IPX" }, 75 { PPP_VJC, "VJC IP" }, 76 { PPP_VJNC, "VJNC IP" }, 77 { PPP_BRPDU, "BRPDU" }, 78 { PPP_STII, "STII" }, 79 { PPP_VINES, "VINES" }, 80 { PPP_MPLS_UCAST, "MPLS" }, 81 { PPP_MPLS_MCAST, "MPLS" }, 82 { PPP_COMP, "Compressed"}, 83 { PPP_ML, "MLPPP"}, 84 { PPP_IPV6, "IP6"}, 85 86 { PPP_HELLO, "HELLO" }, 87 { PPP_LUXCOM, "LUXCOM" }, 88 { PPP_SNS, "SNS" }, 89 { PPP_IPCP, "IPCP" }, 90 { PPP_OSICP, "OSICP" }, 91 { PPP_NSCP, "NSCP" }, 92 { PPP_DECNETCP, "DECNETCP" }, 93 { PPP_APPLECP, "APPLECP" }, 94 { PPP_IPXCP, "IPXCP" }, 95 { PPP_STIICP, "STIICP" }, 96 { PPP_VINESCP, "VINESCP" }, 97 { PPP_IPV6CP, "IP6CP" }, 98 { PPP_MPLSCP, "MPLSCP" }, 99 100 { PPP_LCP, "LCP" }, 101 { PPP_PAP, "PAP" }, 102 { PPP_LQM, "LQM" }, 103 { PPP_CHAP, "CHAP" }, 104 { PPP_EAP, "EAP" }, 105 { PPP_SPAP, "SPAP" }, 106 { PPP_SPAP_OLD, "Old-SPAP" }, 107 { PPP_BACP, "BACP" }, 108 { PPP_BAP, "BAP" }, 109 { PPP_MPCP, "MLPPP-CP" }, 110 { 0, NULL } 111}; 112 113/* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */ 114 115#define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */ 116#define CPCODES_CONF_REQ 1 /* Configure-Request */ 117#define CPCODES_CONF_ACK 2 /* Configure-Ack */ 118#define CPCODES_CONF_NAK 3 /* Configure-Nak */ 119#define CPCODES_CONF_REJ 4 /* Configure-Reject */ 120#define CPCODES_TERM_REQ 5 /* Terminate-Request */ 121#define CPCODES_TERM_ACK 6 /* Terminate-Ack */ 122#define CPCODES_CODE_REJ 7 /* Code-Reject */ 123#define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */ 124#define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */ 125#define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */ 126#define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */ 127#define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */ 128#define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */ 129#define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */ 130#define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */ 131 132struct tok cpcodes[] = { 133 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */ 134 {CPCODES_CONF_REQ, "Conf-Request"}, 135 {CPCODES_CONF_ACK, "Conf-Ack"}, 136 {CPCODES_CONF_NAK, "Conf-Nack"}, 137 {CPCODES_CONF_REJ, "Conf-Reject"}, 138 {CPCODES_TERM_REQ, "Term-Request"}, 139 {CPCODES_TERM_ACK, "Term-Ack"}, 140 {CPCODES_CODE_REJ, "Code-Reject"}, 141 {CPCODES_PROT_REJ, "Prot-Reject"}, 142 {CPCODES_ECHO_REQ, "Echo-Request"}, 143 {CPCODES_ECHO_RPL, "Echo-Reply"}, 144 {CPCODES_DISC_REQ, "Disc-Req"}, 145 {CPCODES_ID, "Ident"}, /* RFC1570 */ 146 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */ 147 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */ 148 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */ 149 {0, NULL} 150}; 151 152/* LCP Config Options */ 153 154#define LCPOPT_VEXT 0 155#define LCPOPT_MRU 1 156#define LCPOPT_ACCM 2 157#define LCPOPT_AP 3 158#define LCPOPT_QP 4 159#define LCPOPT_MN 5 160#define LCPOPT_DEP6 6 161#define LCPOPT_PFC 7 162#define LCPOPT_ACFC 8 163#define LCPOPT_FCSALT 9 164#define LCPOPT_SDP 10 165#define LCPOPT_NUMMODE 11 166#define LCPOPT_DEP12 12 167#define LCPOPT_CBACK 13 168#define LCPOPT_DEP14 14 169#define LCPOPT_DEP15 15 170#define LCPOPT_DEP16 16 171#define LCPOPT_MLMRRU 17 172#define LCPOPT_MLSSNHF 18 173#define LCPOPT_MLED 19 174#define LCPOPT_PROP 20 175#define LCPOPT_DCEID 21 176#define LCPOPT_MPP 22 177#define LCPOPT_LD 23 178#define LCPOPT_LCPAOPT 24 179#define LCPOPT_COBS 25 180#define LCPOPT_PE 26 181#define LCPOPT_MLHF 27 182#define LCPOPT_I18N 28 183#define LCPOPT_SDLOS 29 184#define LCPOPT_PPPMUX 30 185 186#define LCPOPT_MIN LCPOPT_VEXT 187#define LCPOPT_MAX LCPOPT_PPPMUX 188 189static const char *lcpconfopts[] = { 190 "Vend-Ext", /* (0) */ 191 "MRU", /* (1) */ 192 "ACCM", /* (2) */ 193 "Auth-Prot", /* (3) */ 194 "Qual-Prot", /* (4) */ 195 "Magic-Num", /* (5) */ 196 "deprecated(6)", /* used to be a Quality Protocol */ 197 "PFC", /* (7) */ 198 "ACFC", /* (8) */ 199 "FCS-Alt", /* (9) */ 200 "SDP", /* (10) */ 201 "Num-Mode", /* (11) */ 202 "deprecated(12)", /* used to be a Multi-Link-Procedure*/ 203 "Call-Back", /* (13) */ 204 "deprecated(14)", /* used to be a Connect-Time */ 205 "deprecated(15)", /* used to be a Compund-Frames */ 206 "deprecated(16)", /* used to be a Nominal-Data-Encap */ 207 "MRRU", /* (17) */ 208 "12-Bit seq #", /* (18) */ 209 "End-Disc", /* (19) */ 210 "Proprietary", /* (20) */ 211 "DCE-Id", /* (21) */ 212 "MP+", /* (22) */ 213 "Link-Disc", /* (23) */ 214 "LCP-Auth-Opt", /* (24) */ 215 "COBS", /* (25) */ 216 "Prefix-elision", /* (26) */ 217 "Multilink-header-Form",/* (27) */ 218 "I18N", /* (28) */ 219 "SDL-over-SONET/SDH", /* (29) */ 220 "PPP-Muxing", /* (30) */ 221}; 222 223/* ECP - to be supported */ 224 225/* CCP Config Options */ 226 227#define CCPOPT_OUI 0 /* RFC1962 */ 228#define CCPOPT_PRED1 1 /* RFC1962 */ 229#define CCPOPT_PRED2 2 /* RFC1962 */ 230#define CCPOPT_PJUMP 3 /* RFC1962 */ 231/* 4-15 unassigned */ 232#define CCPOPT_HPPPC 16 /* RFC1962 */ 233#define CCPOPT_STACLZS 17 /* RFC1974 */ 234#define CCPOPT_MPPC 18 /* RFC2118 */ 235#define CCPOPT_GFZA 19 /* RFC1962 */ 236#define CCPOPT_V42BIS 20 /* RFC1962 */ 237#define CCPOPT_BSDCOMP 21 /* RFC1977 */ 238/* 22 unassigned */ 239#define CCPOPT_LZSDCP 23 /* RFC1967 */ 240#define CCPOPT_MVRCA 24 /* RFC1975 */ 241#define CCPOPT_DEC 25 /* RFC1976 */ 242#define CCPOPT_DEFLATE 26 /* RFC1979 */ 243/* 27-254 unassigned */ 244#define CCPOPT_RESV 255 /* RFC1962 */ 245 246const struct tok ccpconfopts_values[] = { 247 { CCPOPT_OUI, "OUI" }, 248 { CCPOPT_PRED1, "Pred-1" }, 249 { CCPOPT_PRED2, "Pred-2" }, 250 { CCPOPT_PJUMP, "Puddle" }, 251 { CCPOPT_HPPPC, "HP-PPC" }, 252 { CCPOPT_STACLZS, "Stac-LZS" }, 253 { CCPOPT_MPPC, "MPPC" }, 254 { CCPOPT_GFZA, "Gand-FZA" }, 255 { CCPOPT_V42BIS, "V.42bis" }, 256 { CCPOPT_BSDCOMP, "BSD-Comp" }, 257 { CCPOPT_LZSDCP, "LZS-DCP" }, 258 { CCPOPT_MVRCA, "MVRCA" }, 259 { CCPOPT_DEC, "DEC" }, 260 { CCPOPT_DEFLATE, "Deflate" }, 261 { CCPOPT_RESV, "Reserved"}, 262 {0, NULL} 263}; 264 265/* BACP Config Options */ 266 267#define BACPOPT_FPEER 1 /* RFC2125 */ 268 269const struct tok bacconfopts_values[] = { 270 { BACPOPT_FPEER, "Favored-Peer" }, 271 {0, NULL} 272}; 273 274 275/* SDCP - to be supported */ 276 277/* IPCP Config Options */ 278#define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */ 279#define IPCPOPT_IPCOMP 2 /* RFC1332 */ 280#define IPCPOPT_ADDR 3 /* RFC1332 */ 281#define IPCPOPT_MOBILE4 4 /* RFC2290 */ 282#define IPCPOPT_PRIDNS 129 /* RFC1877 */ 283#define IPCPOPT_PRINBNS 130 /* RFC1877 */ 284#define IPCPOPT_SECDNS 131 /* RFC1877 */ 285#define IPCPOPT_SECNBNS 132 /* RFC1877 */ 286 287struct tok ipcpopt_values[] = { 288 { IPCPOPT_2ADDR, "IP-Addrs" }, 289 { IPCPOPT_IPCOMP, "IP-Comp" }, 290 { IPCPOPT_ADDR, "IP-Addr" }, 291 { IPCPOPT_MOBILE4, "Home-Addr" }, 292 { IPCPOPT_PRIDNS, "Pri-DNS" }, 293 { IPCPOPT_PRINBNS, "Pri-NBNS" }, 294 { IPCPOPT_SECDNS, "Sec-DNS" }, 295 { IPCPOPT_SECNBNS, "Sec-NBNS" }, 296 { 0, NULL } 297}; 298 299#define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */ 300#define IPCPOPT_IPCOMP_MINLEN 14 301 302struct tok ipcpopt_compproto_values[] = { 303 { PPP_VJC, "VJ-Comp" }, 304 { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" }, 305 { 0, NULL } 306}; 307 308struct tok ipcpopt_compproto_subopt_values[] = { 309 { 1, "RTP-Compression" }, 310 { 2, "Enhanced RTP-Compression" }, 311 { 0, NULL } 312}; 313 314/* IP6CP Config Options */ 315#define IP6CP_IFID 1 316 317struct tok ip6cpopt_values[] = { 318 { IP6CP_IFID, "Interface-ID" }, 319 { 0, NULL } 320}; 321 322/* ATCP - to be supported */ 323/* OSINLCP - to be supported */ 324/* BVCP - to be supported */ 325/* BCP - to be supported */ 326/* IPXCP - to be supported */ 327/* MPLSCP - to be supported */ 328 329/* Auth Algorithms */ 330 331/* 0-4 Reserved (RFC1994) */ 332#define AUTHALG_CHAPMD5 5 /* RFC1994 */ 333#define AUTHALG_MSCHAP1 128 /* RFC2433 */ 334#define AUTHALG_MSCHAP2 129 /* RFC2795 */ 335 336struct tok authalg_values[] = { 337 { AUTHALG_CHAPMD5, "MD5" }, 338 { AUTHALG_MSCHAP1, "MS-CHAPv1" }, 339 { AUTHALG_MSCHAP2, "MS-CHAPv2" }, 340 { 0, NULL } 341}; 342 343/* FCS Alternatives - to be supported */ 344 345/* Multilink Endpoint Discriminator (RFC1717) */ 346#define MEDCLASS_NULL 0 /* Null Class */ 347#define MEDCLASS_LOCAL 1 /* Locally Assigned */ 348#define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */ 349#define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */ 350#define MEDCLASS_MNB 4 /* PPP Magic Number Block */ 351#define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */ 352 353/* PPP LCP Callback */ 354#define CALLBACK_AUTH 0 /* Location determined by user auth */ 355#define CALLBACK_DSTR 1 /* Dialing string */ 356#define CALLBACK_LID 2 /* Location identifier */ 357#define CALLBACK_E164 3 /* E.164 number */ 358#define CALLBACK_X500 4 /* X.500 distinguished name */ 359#define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */ 360 361struct tok ppp_callback_values[] = { 362 { CALLBACK_AUTH, "UserAuth" }, 363 { CALLBACK_DSTR, "DialString" }, 364 { CALLBACK_LID, "LocalID" }, 365 { CALLBACK_E164, "E.164" }, 366 { CALLBACK_X500, "X.500" }, 367 { CALLBACK_CBCP, "CBCP" }, 368 { 0, NULL } 369}; 370 371/* CHAP */ 372 373#define CHAP_CHAL 1 374#define CHAP_RESP 2 375#define CHAP_SUCC 3 376#define CHAP_FAIL 4 377 378struct tok chapcode_values[] = { 379 { CHAP_CHAL, "Challenge" }, 380 { CHAP_RESP, "Response" }, 381 { CHAP_SUCC, "Success" }, 382 { CHAP_FAIL, "Fail" }, 383 { 0, NULL} 384}; 385 386/* PAP */ 387 388#define PAP_AREQ 1 389#define PAP_AACK 2 390#define PAP_ANAK 3 391 392struct tok papcode_values[] = { 393 { PAP_AREQ, "Auth-Req" }, 394 { PAP_AACK, "Auth-ACK" }, 395 { PAP_ANAK, "Auth-NACK" }, 396 { 0, NULL } 397}; 398 399/* BAP */ 400#define BAP_CALLREQ 1 401#define BAP_CALLRES 2 402#define BAP_CBREQ 3 403#define BAP_CBRES 4 404#define BAP_LDQREQ 5 405#define BAP_LDQRES 6 406#define BAP_CSIND 7 407#define BAP_CSRES 8 408 409static void handle_ctrl_proto (u_int proto,const u_char *p, int length); 410static void handle_chap (const u_char *p, int length); 411static void handle_pap (const u_char *p, int length); 412static void handle_bap (const u_char *p, int length); 413static void handle_mlppp(const u_char *p, int length); 414static int print_lcp_config_options (const u_char *p, int); 415static int print_ipcp_config_options (const u_char *p, int); 416static int print_ip6cp_config_options (const u_char *p, int); 417static int print_ccp_config_options (const u_char *p, int); 418static int print_bacp_config_options (const u_char *p, int); 419static void handle_ppp (u_int proto, const u_char *p, int length); 420static void ppp_hdlc(const u_char *p, int length); 421 422/* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */ 423static void 424handle_ctrl_proto(u_int proto, const u_char *pptr, int length) 425{ 426 const char *typestr; 427 u_int code, len; 428 int (*pfunc)(const u_char *, int); 429 int x, j; 430 const u_char *tptr; 431 432 tptr=pptr; 433 434 typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto); 435 printf("%s, ",typestr); 436 437 if (length < 4) /* FIXME weak boundary checking */ 438 goto trunc; 439 TCHECK2(*tptr, 2); 440 441 code = *tptr++; 442 443 printf("%s (0x%02x), id %u, length %u", 444 tok2str(cpcodes, "Unknown Opcode",code), 445 code, 446 *tptr++, /* ID */ 447 length+2); 448 449 if (!vflag) 450 return; 451 452 if (length <= 4) 453 return; /* there may be a NULL confreq etc. */ 454 455 TCHECK2(*tptr, 2); 456 len = EXTRACT_16BITS(tptr); 457 tptr += 2; 458 459 printf("\n\tencoded length %u (=Option(s) length %u)",len,len-4); 460 461 if (vflag>1) 462 print_unknown_data(pptr-2,"\n\t",6); 463 464 465 switch (code) { 466 case CPCODES_VEXT: 467 if (length < 11) 468 break; 469 TCHECK2(*tptr, 4); 470 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 471 tptr += 4; 472 TCHECK2(*tptr, 3); 473 printf(" Vendor: %s (%u)", 474 tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)), 475 EXTRACT_24BITS(tptr)); 476 /* XXX: need to decode Kind and Value(s)? */ 477 break; 478 case CPCODES_CONF_REQ: 479 case CPCODES_CONF_ACK: 480 case CPCODES_CONF_NAK: 481 case CPCODES_CONF_REJ: 482 x = len - 4; /* Code(1), Identifier(1) and Length(2) */ 483 do { 484 switch (proto) { 485 case PPP_LCP: 486 pfunc = print_lcp_config_options; 487 break; 488 case PPP_IPCP: 489 pfunc = print_ipcp_config_options; 490 break; 491 case PPP_IPV6CP: 492 pfunc = print_ip6cp_config_options; 493 break; 494 case PPP_CCP: 495 pfunc = print_ccp_config_options; 496 break; 497 case PPP_BACP: 498 pfunc = print_bacp_config_options; 499 break; 500 default: 501 /* 502 * No print routine for the options for 503 * this protocol. 504 */ 505 pfunc = NULL; 506 break; 507 } 508 509 if (pfunc == NULL) /* catch the above null pointer if unknown CP */ 510 break; 511 512 if ((j = (*pfunc)(tptr, len)) == 0) 513 break; 514 x -= j; 515 tptr += j; 516 } while (x > 0); 517 break; 518 519 case CPCODES_TERM_REQ: 520 case CPCODES_TERM_ACK: 521 /* XXX: need to decode Data? */ 522 break; 523 case CPCODES_CODE_REJ: 524 /* XXX: need to decode Rejected-Packet? */ 525 break; 526 case CPCODES_PROT_REJ: 527 if (length < 6) 528 break; 529 TCHECK2(*tptr, 2); 530 printf("\n\t Rejected %s Protocol (0x%04x)", 531 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)), 532 EXTRACT_16BITS(tptr)); 533 /* XXX: need to decode Rejected-Information? - hexdump for now */ 534 if (len > 6) { 535 printf("\n\t Rejected Packet"); 536 print_unknown_data(tptr+2,"\n\t ",len-2); 537 } 538 break; 539 case CPCODES_ECHO_REQ: 540 case CPCODES_ECHO_RPL: 541 case CPCODES_DISC_REQ: 542 if (length < 8) 543 break; 544 TCHECK2(*tptr, 4); 545 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 546 /* XXX: need to decode Data? - hexdump for now */ 547 if (len > 8) { 548 printf("\n\t -----trailing data-----"); 549 TCHECK2(tptr[4], len-8); 550 print_unknown_data(tptr+4,"\n\t ",len-8); 551 } 552 break; 553 case CPCODES_ID: 554 if (length < 8) 555 break; 556 TCHECK2(*tptr, 4); 557 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 558 /* RFC 1661 says this is intended to be human readable */ 559 if (len > 8) { 560 printf("\n\t Message\n\t "); 561 fn_printn(tptr+4,len-4,snapend); 562 } 563 break; 564 case CPCODES_TIME_REM: 565 if (length < 12) 566 break; 567 TCHECK2(*tptr, 4); 568 printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); 569 TCHECK2(*(tptr + 4), 4); 570 printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4)); 571 /* XXX: need to decode Message? */ 572 break; 573 default: 574 /* XXX this is dirty but we do not get the 575 * original pointer passed to the begin 576 * the PPP packet */ 577 if (vflag <= 1) 578 print_unknown_data(pptr-2,"\n\t ",length+2); 579 break; 580 } 581 return; 582 583trunc: 584 printf("[|%s]", typestr); 585} 586 587/* LCP config options */ 588static int 589print_lcp_config_options(const u_char *p, int length) 590{ 591 int len, opt; 592 593 if (length < 2) 594 return 0; 595 TCHECK2(*p, 2); 596 len = p[1]; 597 opt = p[0]; 598 if (length < len) 599 return 0; 600 if (len < 2) { 601 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) 602 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", lcpconfopts[opt],opt,len); 603 else 604 printf("\n\tunknown LCP option 0x%02x", opt); 605 return 0; 606 } 607 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) 608 printf("\n\t %s Option (0x%02x), length %u: ", lcpconfopts[opt],opt,len); 609 else { 610 printf("\n\tunknown LCP option 0x%02x", opt); 611 return len; 612 } 613 614 switch (opt) { 615 case LCPOPT_VEXT: 616 if (len >= 6) { 617 TCHECK2(*(p + 2), 3); 618 printf("Vendor: %s (%u)", 619 tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)), 620 EXTRACT_24BITS(p+2)); 621#if 0 622 TCHECK(p[5]); 623 printf(", kind: 0x%02x", p[5]); 624 printf(", Value: 0x") 625 for (i = 0; i < len - 6; i++) { 626 TCHECK(p[6 + i]); 627 printf("%02x", p[6 + i]); 628 } 629#endif 630 } 631 break; 632 case LCPOPT_MRU: 633 if (len == 4) { 634 TCHECK2(*(p + 2), 2); 635 printf("%u", EXTRACT_16BITS(p + 2)); 636 } 637 break; 638 case LCPOPT_ACCM: 639 if (len == 6) { 640 TCHECK2(*(p + 2), 4); 641 printf("0x%08x", EXTRACT_32BITS(p + 2)); 642 } 643 break; 644 case LCPOPT_AP: 645 if (len >= 4) { 646 TCHECK2(*(p + 2), 2); 647 printf("%s", tok2str(ppptype2str,"Unknown Auth Proto (0x04x)",EXTRACT_16BITS(p+2))); 648 649 switch (EXTRACT_16BITS(p+2)) { 650 case PPP_CHAP: 651 TCHECK(p[4]); 652 printf(", %s",tok2str(authalg_values,"Unknown Auth Alg %u",p[4])); 653 break; 654 case PPP_PAP: /* fall through */ 655 case PPP_EAP: 656 case PPP_SPAP: 657 case PPP_SPAP_OLD: 658 break; 659 default: 660 print_unknown_data(p,"\n\t",len); 661 } 662 } 663 break; 664 case LCPOPT_QP: 665 if (len >= 4) { 666 TCHECK2(*(p + 2), 2); 667 if (EXTRACT_16BITS(p+2) == PPP_LQM) 668 printf(" LQR"); 669 else 670 printf(" unknown"); 671 } 672 break; 673 case LCPOPT_MN: 674 if (len == 6) { 675 TCHECK2(*(p + 2), 4); 676 printf("0x%08x", EXTRACT_32BITS(p + 2)); 677 } 678 break; 679 case LCPOPT_PFC: 680 break; 681 case LCPOPT_ACFC: 682 break; 683 case LCPOPT_LD: 684 if (len == 4) { 685 TCHECK2(*(p + 2), 2); 686 printf("0x%04x", EXTRACT_16BITS(p + 2)); 687 } 688 break; 689 case LCPOPT_CBACK: 690 if (len < 3) 691 break; 692 TCHECK(p[2]); 693 printf("Callback Operation %s (%u)", 694 tok2str(ppp_callback_values,"Unknown",p[2]), 695 p[2]); 696 break; 697 case LCPOPT_MLMRRU: 698 if (len == 4) { 699 TCHECK2(*(p + 2), 2); 700 printf("%u", EXTRACT_16BITS(p + 2)); 701 } 702 break; 703 case LCPOPT_MLED: 704 if (len < 3) 705 break; 706 TCHECK(p[2]); 707 switch (p[2]) { /* class */ 708 case MEDCLASS_NULL: 709 printf("Null"); 710 break; 711 case MEDCLASS_LOCAL: 712 printf("Local"); /* XXX */ 713 break; 714 case MEDCLASS_IPV4: 715 if (len != 7) 716 break; 717 TCHECK2(*(p + 3), 4); 718 printf("IPv4 %s", ipaddr_string(p + 3)); 719 break; 720 case MEDCLASS_MAC: 721 if (len != 9) 722 break; 723 TCHECK(p[8]); 724 printf("MAC %02x:%02x:%02x:%02x:%02x:%02x", 725 p[3], p[4], p[5], p[6], p[7], p[8]); 726 break; 727 case MEDCLASS_MNB: 728 printf("Magic-Num-Block"); /* XXX */ 729 break; 730 case MEDCLASS_PSNDN: 731 printf("PSNDN"); /* XXX */ 732 break; 733 } 734 break; 735 736/* XXX: to be supported */ 737#if 0 738 case LCPOPT_DEP6: 739 case LCPOPT_FCSALT: 740 case LCPOPT_SDP: 741 case LCPOPT_NUMMODE: 742 case LCPOPT_DEP12: 743 case LCPOPT_DEP14: 744 case LCPOPT_DEP15: 745 case LCPOPT_DEP16: 746 case LCPOPT_MLSSNHF: 747 case LCPOPT_PROP: 748 case LCPOPT_DCEID: 749 case LCPOPT_MPP: 750 case LCPOPT_LCPAOPT: 751 case LCPOPT_COBS: 752 case LCPOPT_PE: 753 case LCPOPT_MLHF: 754 case LCPOPT_I18N: 755 case LCPOPT_SDLOS: 756 case LCPOPT_PPPMUX: 757 break; 758#endif 759 default: 760 if(vflag<2) 761 print_unknown_data(&p[2],"\n\t ",len-2); 762 break; 763 } 764 765 if (vflag>1) 766 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 767 768 return len; 769 770trunc: 771 printf("[|lcp]"); 772 return 0; 773} 774 775/* ML-PPP*/ 776struct tok ppp_ml_flag_values[] = { 777 { 0x80, "begin" }, 778 { 0x40, "end" }, 779 { 0, NULL } 780}; 781 782static void 783handle_mlppp(const u_char *p, int length) { 784 785 if (!eflag) 786 printf("MLPPP, "); 787 788 printf("seq 0x%03x, Flags [%s], length %u", 789 (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */ 790 bittok2str(ppp_ml_flag_values, "none", *p & 0xc0), 791 length); 792 793 return; 794} 795 796/* CHAP */ 797static void 798handle_chap(const u_char *p, int length) 799{ 800 u_int code, len; 801 int val_size, name_size, msg_size; 802 const u_char *p0; 803 int i; 804 805 p0 = p; 806 if (length < 1) { 807 printf("[|chap]"); 808 return; 809 } else if (length < 4) { 810 TCHECK(*p); 811 printf("[|chap 0x%02x]", *p); 812 return; 813 } 814 815 TCHECK(*p); 816 code = *p; 817 printf("CHAP, %s (0x%02x)", 818 tok2str(chapcode_values,"unknown",code), 819 code); 820 p++; 821 822 TCHECK(*p); 823 printf(", id %u", *p); /* ID */ 824 p++; 825 826 TCHECK2(*p, 2); 827 len = EXTRACT_16BITS(p); 828 p += 2; 829 830 /* 831 * Note that this is a generic CHAP decoding routine. Since we 832 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1, 833 * MS-CHAPv2) is used at this point, we can't decode packet 834 * specifically to each algorithms. Instead, we simply decode 835 * the GCD (Gratest Common Denominator) for all algorithms. 836 */ 837 switch (code) { 838 case CHAP_CHAL: 839 case CHAP_RESP: 840 if (length - (p - p0) < 1) 841 return; 842 TCHECK(*p); 843 val_size = *p; /* value size */ 844 p++; 845 if (length - (p - p0) < val_size) 846 return; 847 printf(", Value "); 848 for (i = 0; i < val_size; i++) { 849 TCHECK(*p); 850 printf("%02x", *p++); 851 } 852 name_size = len - (p - p0); 853 printf(", Name "); 854 for (i = 0; i < name_size; i++) { 855 TCHECK(*p); 856 safeputchar(*p++); 857 } 858 break; 859 case CHAP_SUCC: 860 case CHAP_FAIL: 861 msg_size = len - (p - p0); 862 printf(", Msg "); 863 for (i = 0; i< msg_size; i++) { 864 TCHECK(*p); 865 safeputchar(*p++); 866 } 867 break; 868 } 869 return; 870 871trunc: 872 printf("[|chap]"); 873} 874 875/* PAP (see RFC 1334) */ 876static void 877handle_pap(const u_char *p, int length) 878{ 879 u_int code, len; 880 int peerid_len, passwd_len, msg_len; 881 const u_char *p0; 882 int i; 883 884 p0 = p; 885 if (length < 1) { 886 printf("[|pap]"); 887 return; 888 } else if (length < 4) { 889 TCHECK(*p); 890 printf("[|pap 0x%02x]", *p); 891 return; 892 } 893 894 TCHECK(*p); 895 code = *p; 896 printf("PAP, %s (0x%02x)", 897 tok2str(papcode_values,"unknown",code), 898 code); 899 p++; 900 901 TCHECK(*p); 902 printf(", id %u", *p); /* ID */ 903 p++; 904 905 TCHECK2(*p, 2); 906 len = EXTRACT_16BITS(p); 907 p += 2; 908 909 if ((int)len > length) { 910 printf(", length %u > packet size", len); 911 return; 912 } 913 length = len; 914 if (length < (p - p0)) { 915 printf(", length %u < PAP header length", length); 916 return; 917 } 918 919 switch (code) { 920 case PAP_AREQ: 921 if (length - (p - p0) < 1) 922 return; 923 TCHECK(*p); 924 peerid_len = *p; /* Peer-ID Length */ 925 p++; 926 if (length - (p - p0) < peerid_len) 927 return; 928 printf(", Peer "); 929 for (i = 0; i < peerid_len; i++) { 930 TCHECK(*p); 931 safeputchar(*p++); 932 } 933 934 if (length - (p - p0) < 1) 935 return; 936 TCHECK(*p); 937 passwd_len = *p; /* Password Length */ 938 p++; 939 if (length - (p - p0) < passwd_len) 940 return; 941 printf(", Name "); 942 for (i = 0; i < passwd_len; i++) { 943 TCHECK(*p); 944 safeputchar(*p++); 945 } 946 break; 947 case PAP_AACK: 948 case PAP_ANAK: 949 if (length - (p - p0) < 1) 950 return; 951 TCHECK(*p); 952 msg_len = *p; /* Msg-Length */ 953 p++; 954 if (length - (p - p0) < msg_len) 955 return; 956 printf(", Msg "); 957 for (i = 0; i< msg_len; i++) { 958 TCHECK(*p); 959 safeputchar(*p++); 960 } 961 break; 962 } 963 return; 964 965trunc: 966 printf("[|pap]"); 967} 968 969/* BAP */ 970static void 971handle_bap(const u_char *p _U_, int length _U_) 972{ 973 /* XXX: to be supported!! */ 974} 975 976 977/* IPCP config options */ 978static int 979print_ipcp_config_options(const u_char *p, int length) 980{ 981 int len, opt; 982 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen; 983 984 if (length < 2) 985 return 0; 986 TCHECK2(*p, 2); 987 len = p[1]; 988 opt = p[0]; 989 if (length < len) 990 return 0; 991 if (len < 2) { 992 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", 993 tok2str(ipcpopt_values,"unknown",opt), 994 opt, 995 len); 996 return 0; 997 } 998 999 printf("\n\t %s Option (0x%02x), length %u: ", 1000 tok2str(ipcpopt_values,"unknown",opt), 1001 opt, 1002 len); 1003 1004 switch (opt) { 1005 case IPCPOPT_2ADDR: /* deprecated */ 1006 if (len != 10) 1007 goto invlen; 1008 TCHECK2(*(p + 6), 4); 1009 printf("src %s, dst %s", 1010 ipaddr_string(p + 2), 1011 ipaddr_string(p + 6)); 1012 break; 1013 case IPCPOPT_IPCOMP: 1014 if (len < 4) 1015 goto invlen; 1016 TCHECK2(*(p + 2), 2); 1017 compproto = EXTRACT_16BITS(p+2); 1018 1019 printf("%s (0x%02x):", 1020 tok2str(ipcpopt_compproto_values,"Unknown",compproto), 1021 compproto); 1022 1023 switch (compproto) { 1024 case PPP_VJC: 1025 /* XXX: VJ-Comp parameters should be decoded */ 1026 break; 1027 case IPCPOPT_IPCOMP_HDRCOMP: 1028 if (len < IPCPOPT_IPCOMP_MINLEN) 1029 goto invlen; 1030 1031 TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN); 1032 printf("\n\t TCP Space %u, non-TCP Space %u" \ 1033 ", maxPeriod %u, maxTime %u, maxHdr %u", 1034 EXTRACT_16BITS(p+4), 1035 EXTRACT_16BITS(p+6), 1036 EXTRACT_16BITS(p+8), 1037 EXTRACT_16BITS(p+10), 1038 EXTRACT_16BITS(p+12)); 1039 1040 /* suboptions present ? */ 1041 if (len > IPCPOPT_IPCOMP_MINLEN) { 1042 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN; 1043 p += IPCPOPT_IPCOMP_MINLEN; 1044 1045 printf("\n\t Suboptions, length %u", ipcomp_subopttotallen); 1046 1047 while (ipcomp_subopttotallen >= 2) { 1048 TCHECK2(*p, 2); 1049 ipcomp_subopt = *p; 1050 ipcomp_suboptlen = *(p+1); 1051 1052 /* sanity check */ 1053 if (ipcomp_subopt == 0 || 1054 ipcomp_suboptlen == 0 ) 1055 break; 1056 1057 /* XXX: just display the suboptions for now */ 1058 printf("\n\t\t%s Suboption #%u, length %u", 1059 tok2str(ipcpopt_compproto_subopt_values, 1060 "Unknown", 1061 ipcomp_subopt), 1062 ipcomp_subopt, 1063 ipcomp_suboptlen); 1064 1065 ipcomp_subopttotallen -= ipcomp_suboptlen; 1066 p += ipcomp_suboptlen; 1067 } 1068 } 1069 break; 1070 default: 1071 break; 1072 } 1073 break; 1074 1075 case IPCPOPT_ADDR: /* those options share the same format - fall through */ 1076 case IPCPOPT_MOBILE4: 1077 case IPCPOPT_PRIDNS: 1078 case IPCPOPT_PRINBNS: 1079 case IPCPOPT_SECDNS: 1080 case IPCPOPT_SECNBNS: 1081 if (len != 6) 1082 goto invlen; 1083 TCHECK2(*(p + 2), 4); 1084 printf("%s", ipaddr_string(p + 2)); 1085 break; 1086 default: 1087 if(vflag<2) 1088 print_unknown_data(&p[2],"\n\t ",len-2); 1089 break; 1090 } 1091 if (vflag>1) 1092 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 1093 return len; 1094 1095invlen: 1096 printf(", invalid-length-%d", opt); 1097 return 0; 1098 1099trunc: 1100 printf("[|ipcp]"); 1101 return 0; 1102} 1103 1104/* IP6CP config options */ 1105static int 1106print_ip6cp_config_options(const u_char *p, int length) 1107{ 1108 int len, opt; 1109 1110 if (length < 2) 1111 return 0; 1112 TCHECK2(*p, 2); 1113 len = p[1]; 1114 opt = p[0]; 1115 if (length < len) 1116 return 0; 1117 if (len < 2) { 1118 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", 1119 tok2str(ip6cpopt_values,"unknown",opt), 1120 opt, 1121 len); 1122 return 0; 1123 } 1124 1125 printf("\n\t %s Option (0x%02x), length %u: ", 1126 tok2str(ip6cpopt_values,"unknown",opt), 1127 opt, 1128 len); 1129 1130 switch (opt) { 1131 case IP6CP_IFID: 1132 if (len != 10) 1133 goto invlen; 1134 TCHECK2(*(p + 2), 8); 1135 printf("%04x:%04x:%04x:%04x", 1136 EXTRACT_16BITS(p + 2), 1137 EXTRACT_16BITS(p + 4), 1138 EXTRACT_16BITS(p + 6), 1139 EXTRACT_16BITS(p + 8)); 1140 break; 1141 default: 1142 if(vflag<2) 1143 print_unknown_data(&p[2],"\n\t ",len-2); 1144 break; 1145 } 1146 if (vflag>1) 1147 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 1148 1149 return len; 1150 1151invlen: 1152 printf(", invalid-length-%d", opt); 1153 return 0; 1154 1155trunc: 1156 printf("[|ip6cp]"); 1157 return 0; 1158} 1159 1160 1161/* CCP config options */ 1162static int 1163print_ccp_config_options(const u_char *p, int length) 1164{ 1165 int len, opt; 1166 1167 if (length < 2) 1168 return 0; 1169 TCHECK2(*p, 2); 1170 len = p[1]; 1171 opt = p[0]; 1172 if (length < len) 1173 return 0; 1174 if (len < 2) { 1175 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", 1176 tok2str(ccpconfopts_values, "Unknown", opt), 1177 opt, 1178 len); 1179 return 0; 1180 } 1181 1182 printf("\n\t %s Option (0x%02x), length %u:", 1183 tok2str(ccpconfopts_values, "Unknown", opt), 1184 opt, 1185 len); 1186 1187 switch (opt) { 1188 /* fall through --> default: nothing supported yet */ 1189 case CCPOPT_OUI: 1190 case CCPOPT_PRED1: 1191 case CCPOPT_PRED2: 1192 case CCPOPT_PJUMP: 1193 case CCPOPT_HPPPC: 1194 case CCPOPT_STACLZS: 1195 case CCPOPT_MPPC: 1196 case CCPOPT_GFZA: 1197 case CCPOPT_V42BIS: 1198 case CCPOPT_BSDCOMP: 1199 case CCPOPT_LZSDCP: 1200 case CCPOPT_MVRCA: 1201 case CCPOPT_DEC: 1202 case CCPOPT_DEFLATE: 1203 case CCPOPT_RESV: 1204 default: 1205 if(vflag<2) 1206 print_unknown_data(&p[2],"\n\t ",len-2); 1207 break; 1208 } 1209 if (vflag>1) 1210 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 1211 1212 return len; 1213 1214trunc: 1215 printf("[|ccp]"); 1216 return 0; 1217} 1218 1219/* BACP config options */ 1220static int 1221print_bacp_config_options(const u_char *p, int length) 1222{ 1223 int len, opt; 1224 1225 if (length < 2) 1226 return 0; 1227 TCHECK2(*p, 2); 1228 len = p[1]; 1229 opt = p[0]; 1230 if (length < len) 1231 return 0; 1232 if (len < 2) { 1233 printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", 1234 tok2str(bacconfopts_values, "Unknown", opt), 1235 opt, 1236 len); 1237 return 0; 1238 } 1239 1240 printf("\n\t %s Option (0x%02x), length %u:", 1241 tok2str(bacconfopts_values, "Unknown", opt), 1242 opt, 1243 len); 1244 1245 switch (opt) { 1246 case BACPOPT_FPEER: 1247 TCHECK2(*(p + 2), 4); 1248 printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2)); 1249 break; 1250 default: 1251 if(vflag<2) 1252 print_unknown_data(&p[2],"\n\t ",len-2); 1253 break; 1254 } 1255 if (vflag>1) 1256 print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ 1257 1258 return len; 1259 1260trunc: 1261 printf("[|bacp]"); 1262 return 0; 1263} 1264 1265 1266static void 1267ppp_hdlc(const u_char *p, int length) 1268{ 1269 u_char *b, *s, *t, c; 1270 int i, proto; 1271 const void *se; 1272 1273 b = (u_int8_t *)malloc(length); 1274 if (b == NULL) 1275 return; 1276 1277 /* 1278 * Unescape all the data into a temporary, private, buffer. 1279 * Do this so that we dont overwrite the original packet 1280 * contents. 1281 */ 1282 for (s = (u_char *)p, t = b, i = length; i > 0; i--) { 1283 c = *s++; 1284 if (c == 0x7d) { 1285 if (i > 1) { 1286 i--; 1287 c = *s++ ^ 0x20; 1288 } else 1289 continue; 1290 } 1291 *t++ = c; 1292 } 1293 1294 se = snapend; 1295 snapend = t; 1296 1297 /* now lets guess about the payload codepoint format */ 1298 proto = *b; /* start with a one-octet codepoint guess */ 1299 1300 switch (proto) { 1301 case PPP_IP: 1302 ip_print(gndo, b+1, t - b - 1); 1303 goto cleanup; 1304#ifdef INET6 1305 case PPP_IPV6: 1306 ip6_print(gndo, b+1, t - b - 1); 1307 goto cleanup; 1308#endif 1309 default: /* no luck - try next guess */ 1310 break; 1311 } 1312 1313 proto = EXTRACT_16BITS(b); /* next guess - load two octets */ 1314 1315 switch (proto) { 1316 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */ 1317 proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */ 1318 handle_ppp(proto, b+4, t - b - 4); 1319 break; 1320 default: /* last guess - proto must be a PPP proto-id */ 1321 handle_ppp(proto, b+2, t - b - 2); 1322 break; 1323 } 1324 1325cleanup: 1326 snapend = se; 1327 free(b); 1328 return; 1329} 1330 1331 1332/* PPP */ 1333static void 1334handle_ppp(u_int proto, const u_char *p, int length) 1335{ 1336 if ((proto & 0xff00) == 0x7e00) {/* is this an escape code ? */ 1337 ppp_hdlc(p-1, length); 1338 return; 1339 } 1340 1341 switch (proto) { 1342 case PPP_LCP: /* fall through */ 1343 case PPP_IPCP: 1344 case PPP_OSICP: 1345 case PPP_MPLSCP: 1346 case PPP_IPV6CP: 1347 case PPP_CCP: 1348 case PPP_BACP: 1349 handle_ctrl_proto(proto, p, length); 1350 break; 1351 case PPP_ML: 1352 handle_mlppp(p, length); 1353 break; 1354 case PPP_CHAP: 1355 handle_chap(p, length); 1356 break; 1357 case PPP_PAP: 1358 handle_pap(p, length); 1359 break; 1360 case PPP_BAP: /* XXX: not yet completed */ 1361 handle_bap(p, length); 1362 break; 1363 case ETHERTYPE_IP: /*XXX*/ 1364 case PPP_VJNC: 1365 case PPP_IP: 1366 ip_print(gndo, p, length); 1367 break; 1368#ifdef INET6 1369 case ETHERTYPE_IPV6: /*XXX*/ 1370 case PPP_IPV6: 1371 ip6_print(gndo, p, length); 1372 break; 1373#endif 1374 case ETHERTYPE_IPX: /*XXX*/ 1375 case PPP_IPX: 1376 ipx_print(p, length); 1377 break; 1378 case PPP_OSI: 1379 isoclns_print(p, length, length); 1380 break; 1381 case PPP_MPLS_UCAST: 1382 case PPP_MPLS_MCAST: 1383 mpls_print(p, length); 1384 break; 1385 case PPP_COMP: 1386 printf("compressed PPP data"); 1387 break; 1388 default: 1389 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1390 print_unknown_data(p,"\n\t",length); 1391 break; 1392 } 1393} 1394 1395/* Standard PPP printer */ 1396u_int 1397ppp_print(register const u_char *p, u_int length) 1398{ 1399 u_int proto,ppp_header; 1400 u_int olen = length; /* _o_riginal length */ 1401 u_int hdr_len = 0; 1402 1403 /* 1404 * Here, we assume that p points to the Address and Control 1405 * field (if they present). 1406 */ 1407 if (length < 2) 1408 goto trunc; 1409 TCHECK2(*p, 2); 1410 ppp_header = EXTRACT_16BITS(p); 1411 1412 switch(ppp_header) { 1413 case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL): 1414 if (eflag) printf("In "); 1415 p += 2; 1416 length -= 2; 1417 hdr_len += 2; 1418 break; 1419 case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL): 1420 if (eflag) printf("Out "); 1421 p += 2; 1422 length -= 2; 1423 hdr_len += 2; 1424 break; 1425 case (PPP_ADDRESS << 8 | PPP_CONTROL): 1426 p += 2; /* ACFC not used */ 1427 length -= 2; 1428 hdr_len += 2; 1429 break; 1430 1431 default: 1432 break; 1433 } 1434 1435 if (length < 2) 1436 goto trunc; 1437 TCHECK(*p); 1438 if (*p % 2) { 1439 proto = *p; /* PFC is used */ 1440 p++; 1441 length--; 1442 hdr_len++; 1443 } else { 1444 TCHECK2(*p, 2); 1445 proto = EXTRACT_16BITS(p); 1446 p += 2; 1447 length -= 2; 1448 hdr_len += 2; 1449 } 1450 1451 if (eflag) 1452 printf("%s (0x%04x), length %u: ", 1453 tok2str(ppptype2str, "unknown", proto), 1454 proto, 1455 olen); 1456 1457 handle_ppp(proto, p, length); 1458 return (hdr_len); 1459trunc: 1460 printf("[|ppp]"); 1461 return (0); 1462} 1463 1464 1465/* PPP I/F printer */ 1466u_int 1467ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p) 1468{ 1469 register u_int length = h->len; 1470 register u_int caplen = h->caplen; 1471 1472 if (caplen < PPP_HDRLEN) { 1473 printf("[|ppp]"); 1474 return (caplen); 1475 } 1476 1477#if 0 1478 /* 1479 * XXX: seems to assume that there are 2 octets prepended to an 1480 * actual PPP frame. The 1st octet looks like Input/Output flag 1481 * while 2nd octet is unknown, at least to me 1482 * (mshindo@mshindo.net). 1483 * 1484 * That was what the original tcpdump code did. 1485 * 1486 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound 1487 * packets and 0 for inbound packets - but only if the 1488 * protocol field has the 0x8000 bit set (i.e., it's a network 1489 * control protocol); it does so before running the packet through 1490 * "bpf_filter" to see if it should be discarded, and to see 1491 * if we should update the time we sent the most recent packet... 1492 * 1493 * ...but it puts the original address field back after doing 1494 * so. 1495 * 1496 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion. 1497 * 1498 * I don't know if any PPP implementation handed up to a BPF 1499 * device packets with the first octet being 1 for outbound and 1500 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know 1501 * whether that ever needs to be checked or not. 1502 * 1503 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP, 1504 * and its tcpdump appears to assume that the frame always 1505 * begins with an address field and a control field, and that 1506 * the address field might be 0x0f or 0x8f, for Cisco 1507 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1508 * 1547, as well as 0xff, for PPP in HDLC-like framing as per 1509 * RFC 1662. 1510 * 1511 * (Is the Cisco framing in question what DLT_C_HDLC, in 1512 * BSD/OS, is?) 1513 */ 1514 if (eflag) 1515 printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]); 1516#endif 1517 1518 ppp_print(p, length); 1519 1520 return (0); 1521} 1522 1523/* 1524 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like 1525 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547, 1526 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL, 1527 * discard them *if* those are the first two octets, and parse the remaining 1528 * packet as a PPP packet, as "ppp_print()" does). 1529 * 1530 * This handles, for example, DLT_PPP_SERIAL in NetBSD. 1531 */ 1532u_int 1533ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) 1534{ 1535 register u_int length = h->len; 1536 register u_int caplen = h->caplen; 1537 u_int proto; 1538 u_int hdrlen = 0; 1539 1540 if (caplen < 2) { 1541 printf("[|ppp]"); 1542 return (caplen); 1543 } 1544 1545 switch (p[0]) { 1546 1547 case PPP_ADDRESS: 1548 if (caplen < 4) { 1549 printf("[|ppp]"); 1550 return (caplen); 1551 } 1552 1553 if (eflag) 1554 printf("%02x %02x %d ", p[0], p[1], length); 1555 p += 2; 1556 length -= 2; 1557 hdrlen += 2; 1558 1559 proto = EXTRACT_16BITS(p); 1560 p += 2; 1561 length -= 2; 1562 hdrlen += 2; 1563 printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); 1564 1565 handle_ppp(proto, p, length); 1566 break; 1567 1568 case CHDLC_UNICAST: 1569 case CHDLC_BCAST: 1570 return (chdlc_if_print(h, p)); 1571 1572 default: 1573 if (eflag) 1574 printf("%02x %02x %d ", p[0], p[1], length); 1575 p += 2; 1576 length -= 2; 1577 hdrlen += 2; 1578 1579 /* 1580 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats 1581 * the next two octets as an Ethernet type; does that 1582 * ever happen? 1583 */ 1584 printf("unknown addr %02x; ctrl %02x", p[0], p[1]); 1585 break; 1586 } 1587 1588 return (hdrlen); 1589} 1590 1591#define PPP_BSDI_HDRLEN 24 1592 1593/* BSD/OS specific PPP printer */ 1594u_int 1595ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_) 1596{ 1597 register int hdrlength; 1598#ifdef __bsdi__ 1599 register u_int length = h->len; 1600 register u_int caplen = h->caplen; 1601 u_int16_t ptype; 1602 const u_char *q; 1603 int i; 1604 1605 if (caplen < PPP_BSDI_HDRLEN) { 1606 printf("[|ppp]"); 1607 return (caplen) 1608 } 1609 1610 hdrlength = 0; 1611 1612#if 0 1613 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) { 1614 if (eflag) 1615 printf("%02x %02x ", p[0], p[1]); 1616 p += 2; 1617 hdrlength = 2; 1618 } 1619 1620 if (eflag) 1621 printf("%d ", length); 1622 /* Retrieve the protocol type */ 1623 if (*p & 01) { 1624 /* Compressed protocol field */ 1625 ptype = *p; 1626 if (eflag) 1627 printf("%02x ", ptype); 1628 p++; 1629 hdrlength += 1; 1630 } else { 1631 /* Un-compressed protocol field */ 1632 ptype = EXTRACT_16BITS(p); 1633 if (eflag) 1634 printf("%04x ", ptype); 1635 p += 2; 1636 hdrlength += 2; 1637 } 1638#else 1639 ptype = 0; /*XXX*/ 1640 if (eflag) 1641 printf("%c ", p[SLC_DIR] ? 'O' : 'I'); 1642 if (p[SLC_LLHL]) { 1643 /* link level header */ 1644 struct ppp_header *ph; 1645 1646 q = p + SLC_BPFHDRLEN; 1647 ph = (struct ppp_header *)q; 1648 if (ph->phdr_addr == PPP_ADDRESS 1649 && ph->phdr_ctl == PPP_CONTROL) { 1650 if (eflag) 1651 printf("%02x %02x ", q[0], q[1]); 1652 ptype = EXTRACT_16BITS(&ph->phdr_type); 1653 if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { 1654 printf("%s ", tok2str(ppptype2str, 1655 "proto-#%d", ptype)); 1656 } 1657 } else { 1658 if (eflag) { 1659 printf("LLH=["); 1660 for (i = 0; i < p[SLC_LLHL]; i++) 1661 printf("%02x", q[i]); 1662 printf("] "); 1663 } 1664 } 1665 } 1666 if (eflag) 1667 printf("%d ", length); 1668 if (p[SLC_CHL]) { 1669 q = p + SLC_BPFHDRLEN + p[SLC_LLHL]; 1670 1671 switch (ptype) { 1672 case PPP_VJC: 1673 ptype = vjc_print(q, ptype); 1674 hdrlength = PPP_BSDI_HDRLEN; 1675 p += hdrlength; 1676 switch (ptype) { 1677 case PPP_IP: 1678 ip_print(gndo, p, length); 1679 break; 1680#ifdef INET6 1681 case PPP_IPV6: 1682 ip6_print(gndo, p, length); 1683 break; 1684#endif 1685 case PPP_MPLS_UCAST: 1686 case PPP_MPLS_MCAST: 1687 mpls_print(p, length); 1688 break; 1689 } 1690 goto printx; 1691 case PPP_VJNC: 1692 ptype = vjc_print(q, ptype); 1693 hdrlength = PPP_BSDI_HDRLEN; 1694 p += hdrlength; 1695 switch (ptype) { 1696 case PPP_IP: 1697 ip_print(gndo, p, length); 1698 break; 1699#ifdef INET6 1700 case PPP_IPV6: 1701 ip6_print(gndo, p, length); 1702 break; 1703#endif 1704 case PPP_MPLS_UCAST: 1705 case PPP_MPLS_MCAST: 1706 mpls_print(p, length); 1707 break; 1708 } 1709 goto printx; 1710 default: 1711 if (eflag) { 1712 printf("CH=["); 1713 for (i = 0; i < p[SLC_LLHL]; i++) 1714 printf("%02x", q[i]); 1715 printf("] "); 1716 } 1717 break; 1718 } 1719 } 1720 1721 hdrlength = PPP_BSDI_HDRLEN; 1722#endif 1723 1724 length -= hdrlength; 1725 p += hdrlength; 1726 1727 switch (ptype) { 1728 case PPP_IP: 1729 ip_print(p, length); 1730 break; 1731#ifdef INET6 1732 case PPP_IPV6: 1733 ip6_print(gndo, p, length); 1734 break; 1735#endif 1736 case PPP_MPLS_UCAST: 1737 case PPP_MPLS_MCAST: 1738 mpls_print(gndo, p, length); 1739 break; 1740 default: 1741 printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype)); 1742 } 1743 1744printx: 1745#else /* __bsdi */ 1746 hdrlength = 0; 1747#endif /* __bsdi__ */ 1748 return (hdrlength); 1749} 1750 1751 1752/* 1753 * Local Variables: 1754 * c-style: whitesmith 1755 * c-basic-offset: 8 1756 * End: 1757 */ 1758