| /* |
| * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * Extensively modified by Motonori Shindo (mshindo@mshindo.net) for more |
| * complete PPP support. |
| */ |
| |
| /* |
| * TODO: |
| * o resolve XXX as much as possible |
| * o MP support |
| * o BAP support |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.114 2005-12-05 11:35:58 hannes Exp $ (LBL)"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #ifdef __bsdi__ |
| #include <net/slcompress.h> |
| #include <net/if_ppp.h> |
| #endif |
| |
| #include <pcap.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "interface.h" |
| #include "extract.h" |
| #include "addrtoname.h" |
| #include "ppp.h" |
| #include "chdlc.h" |
| #include "ethertype.h" |
| #include "oui.h" |
| |
| /* |
| * The following constatns are defined by IANA. Please refer to |
| * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers |
| * for the up-to-date information. |
| */ |
| |
| /* Protocol Codes defined in ppp.h */ |
| |
| struct tok ppptype2str[] = { |
| { PPP_IP, "IP" }, |
| { PPP_OSI, "OSI" }, |
| { PPP_NS, "NS" }, |
| { PPP_DECNET, "DECNET" }, |
| { PPP_APPLE, "APPLE" }, |
| { PPP_IPX, "IPX" }, |
| { PPP_VJC, "VJC IP" }, |
| { PPP_VJNC, "VJNC IP" }, |
| { PPP_BRPDU, "BRPDU" }, |
| { PPP_STII, "STII" }, |
| { PPP_VINES, "VINES" }, |
| { PPP_MPLS_UCAST, "MPLS" }, |
| { PPP_MPLS_MCAST, "MPLS" }, |
| { PPP_COMP, "Compressed"}, |
| { PPP_ML, "MLPPP"}, |
| { PPP_IPV6, "IP6"}, |
| |
| { PPP_HELLO, "HELLO" }, |
| { PPP_LUXCOM, "LUXCOM" }, |
| { PPP_SNS, "SNS" }, |
| { PPP_IPCP, "IPCP" }, |
| { PPP_OSICP, "OSICP" }, |
| { PPP_NSCP, "NSCP" }, |
| { PPP_DECNETCP, "DECNETCP" }, |
| { PPP_APPLECP, "APPLECP" }, |
| { PPP_IPXCP, "IPXCP" }, |
| { PPP_STIICP, "STIICP" }, |
| { PPP_VINESCP, "VINESCP" }, |
| { PPP_IPV6CP, "IP6CP" }, |
| { PPP_MPLSCP, "MPLSCP" }, |
| |
| { PPP_LCP, "LCP" }, |
| { PPP_PAP, "PAP" }, |
| { PPP_LQM, "LQM" }, |
| { PPP_CHAP, "CHAP" }, |
| { PPP_EAP, "EAP" }, |
| { PPP_SPAP, "SPAP" }, |
| { PPP_SPAP_OLD, "Old-SPAP" }, |
| { PPP_BACP, "BACP" }, |
| { PPP_BAP, "BAP" }, |
| { PPP_MPCP, "MLPPP-CP" }, |
| { 0, NULL } |
| }; |
| |
| /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */ |
| |
| #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */ |
| #define CPCODES_CONF_REQ 1 /* Configure-Request */ |
| #define CPCODES_CONF_ACK 2 /* Configure-Ack */ |
| #define CPCODES_CONF_NAK 3 /* Configure-Nak */ |
| #define CPCODES_CONF_REJ 4 /* Configure-Reject */ |
| #define CPCODES_TERM_REQ 5 /* Terminate-Request */ |
| #define CPCODES_TERM_ACK 6 /* Terminate-Ack */ |
| #define CPCODES_CODE_REJ 7 /* Code-Reject */ |
| #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */ |
| #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */ |
| #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */ |
| #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */ |
| #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */ |
| #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */ |
| #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */ |
| #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */ |
| |
| struct tok cpcodes[] = { |
| {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */ |
| {CPCODES_CONF_REQ, "Conf-Request"}, |
| {CPCODES_CONF_ACK, "Conf-Ack"}, |
| {CPCODES_CONF_NAK, "Conf-Nack"}, |
| {CPCODES_CONF_REJ, "Conf-Reject"}, |
| {CPCODES_TERM_REQ, "Term-Request"}, |
| {CPCODES_TERM_ACK, "Term-Ack"}, |
| {CPCODES_CODE_REJ, "Code-Reject"}, |
| {CPCODES_PROT_REJ, "Prot-Reject"}, |
| {CPCODES_ECHO_REQ, "Echo-Request"}, |
| {CPCODES_ECHO_RPL, "Echo-Reply"}, |
| {CPCODES_DISC_REQ, "Disc-Req"}, |
| {CPCODES_ID, "Ident"}, /* RFC1570 */ |
| {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */ |
| {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */ |
| {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */ |
| {0, NULL} |
| }; |
| |
| /* LCP Config Options */ |
| |
| #define LCPOPT_VEXT 0 |
| #define LCPOPT_MRU 1 |
| #define LCPOPT_ACCM 2 |
| #define LCPOPT_AP 3 |
| #define LCPOPT_QP 4 |
| #define LCPOPT_MN 5 |
| #define LCPOPT_DEP6 6 |
| #define LCPOPT_PFC 7 |
| #define LCPOPT_ACFC 8 |
| #define LCPOPT_FCSALT 9 |
| #define LCPOPT_SDP 10 |
| #define LCPOPT_NUMMODE 11 |
| #define LCPOPT_DEP12 12 |
| #define LCPOPT_CBACK 13 |
| #define LCPOPT_DEP14 14 |
| #define LCPOPT_DEP15 15 |
| #define LCPOPT_DEP16 16 |
| #define LCPOPT_MLMRRU 17 |
| #define LCPOPT_MLSSNHF 18 |
| #define LCPOPT_MLED 19 |
| #define LCPOPT_PROP 20 |
| #define LCPOPT_DCEID 21 |
| #define LCPOPT_MPP 22 |
| #define LCPOPT_LD 23 |
| #define LCPOPT_LCPAOPT 24 |
| #define LCPOPT_COBS 25 |
| #define LCPOPT_PE 26 |
| #define LCPOPT_MLHF 27 |
| #define LCPOPT_I18N 28 |
| #define LCPOPT_SDLOS 29 |
| #define LCPOPT_PPPMUX 30 |
| |
| #define LCPOPT_MIN LCPOPT_VEXT |
| #define LCPOPT_MAX LCPOPT_PPPMUX |
| |
| static const char *lcpconfopts[] = { |
| "Vend-Ext", /* (0) */ |
| "MRU", /* (1) */ |
| "ACCM", /* (2) */ |
| "Auth-Prot", /* (3) */ |
| "Qual-Prot", /* (4) */ |
| "Magic-Num", /* (5) */ |
| "deprecated(6)", /* used to be a Quality Protocol */ |
| "PFC", /* (7) */ |
| "ACFC", /* (8) */ |
| "FCS-Alt", /* (9) */ |
| "SDP", /* (10) */ |
| "Num-Mode", /* (11) */ |
| "deprecated(12)", /* used to be a Multi-Link-Procedure*/ |
| "Call-Back", /* (13) */ |
| "deprecated(14)", /* used to be a Connect-Time */ |
| "deprecated(15)", /* used to be a Compund-Frames */ |
| "deprecated(16)", /* used to be a Nominal-Data-Encap */ |
| "MRRU", /* (17) */ |
| "12-Bit seq #", /* (18) */ |
| "End-Disc", /* (19) */ |
| "Proprietary", /* (20) */ |
| "DCE-Id", /* (21) */ |
| "MP+", /* (22) */ |
| "Link-Disc", /* (23) */ |
| "LCP-Auth-Opt", /* (24) */ |
| "COBS", /* (25) */ |
| "Prefix-elision", /* (26) */ |
| "Multilink-header-Form",/* (27) */ |
| "I18N", /* (28) */ |
| "SDL-over-SONET/SDH", /* (29) */ |
| "PPP-Muxing", /* (30) */ |
| }; |
| |
| /* ECP - to be supported */ |
| |
| /* CCP Config Options */ |
| |
| #define CCPOPT_OUI 0 /* RFC1962 */ |
| #define CCPOPT_PRED1 1 /* RFC1962 */ |
| #define CCPOPT_PRED2 2 /* RFC1962 */ |
| #define CCPOPT_PJUMP 3 /* RFC1962 */ |
| /* 4-15 unassigned */ |
| #define CCPOPT_HPPPC 16 /* RFC1962 */ |
| #define CCPOPT_STACLZS 17 /* RFC1974 */ |
| #define CCPOPT_MPPC 18 /* RFC2118 */ |
| #define CCPOPT_GFZA 19 /* RFC1962 */ |
| #define CCPOPT_V42BIS 20 /* RFC1962 */ |
| #define CCPOPT_BSDCOMP 21 /* RFC1977 */ |
| /* 22 unassigned */ |
| #define CCPOPT_LZSDCP 23 /* RFC1967 */ |
| #define CCPOPT_MVRCA 24 /* RFC1975 */ |
| #define CCPOPT_DEC 25 /* RFC1976 */ |
| #define CCPOPT_DEFLATE 26 /* RFC1979 */ |
| /* 27-254 unassigned */ |
| #define CCPOPT_RESV 255 /* RFC1962 */ |
| |
| const struct tok ccpconfopts_values[] = { |
| { CCPOPT_OUI, "OUI" }, |
| { CCPOPT_PRED1, "Pred-1" }, |
| { CCPOPT_PRED2, "Pred-2" }, |
| { CCPOPT_PJUMP, "Puddle" }, |
| { CCPOPT_HPPPC, "HP-PPC" }, |
| { CCPOPT_STACLZS, "Stac-LZS" }, |
| { CCPOPT_MPPC, "MPPC" }, |
| { CCPOPT_GFZA, "Gand-FZA" }, |
| { CCPOPT_V42BIS, "V.42bis" }, |
| { CCPOPT_BSDCOMP, "BSD-Comp" }, |
| { CCPOPT_LZSDCP, "LZS-DCP" }, |
| { CCPOPT_MVRCA, "MVRCA" }, |
| { CCPOPT_DEC, "DEC" }, |
| { CCPOPT_DEFLATE, "Deflate" }, |
| { CCPOPT_RESV, "Reserved"}, |
| {0, NULL} |
| }; |
| |
| /* BACP Config Options */ |
| |
| #define BACPOPT_FPEER 1 /* RFC2125 */ |
| |
| const struct tok bacconfopts_values[] = { |
| { BACPOPT_FPEER, "Favored-Peer" }, |
| {0, NULL} |
| }; |
| |
| |
| /* SDCP - to be supported */ |
| |
| /* IPCP Config Options */ |
| #define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */ |
| #define IPCPOPT_IPCOMP 2 /* RFC1332 */ |
| #define IPCPOPT_ADDR 3 /* RFC1332 */ |
| #define IPCPOPT_MOBILE4 4 /* RFC2290 */ |
| #define IPCPOPT_PRIDNS 129 /* RFC1877 */ |
| #define IPCPOPT_PRINBNS 130 /* RFC1877 */ |
| #define IPCPOPT_SECDNS 131 /* RFC1877 */ |
| #define IPCPOPT_SECNBNS 132 /* RFC1877 */ |
| |
| struct tok ipcpopt_values[] = { |
| { IPCPOPT_2ADDR, "IP-Addrs" }, |
| { IPCPOPT_IPCOMP, "IP-Comp" }, |
| { IPCPOPT_ADDR, "IP-Addr" }, |
| { IPCPOPT_MOBILE4, "Home-Addr" }, |
| { IPCPOPT_PRIDNS, "Pri-DNS" }, |
| { IPCPOPT_PRINBNS, "Pri-NBNS" }, |
| { IPCPOPT_SECDNS, "Sec-DNS" }, |
| { IPCPOPT_SECNBNS, "Sec-NBNS" }, |
| { 0, NULL } |
| }; |
| |
| #define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */ |
| #define IPCPOPT_IPCOMP_MINLEN 14 |
| |
| struct tok ipcpopt_compproto_values[] = { |
| { PPP_VJC, "VJ-Comp" }, |
| { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" }, |
| { 0, NULL } |
| }; |
| |
| struct tok ipcpopt_compproto_subopt_values[] = { |
| { 1, "RTP-Compression" }, |
| { 2, "Enhanced RTP-Compression" }, |
| { 0, NULL } |
| }; |
| |
| /* IP6CP Config Options */ |
| #define IP6CP_IFID 1 |
| |
| struct tok ip6cpopt_values[] = { |
| { IP6CP_IFID, "Interface-ID" }, |
| { 0, NULL } |
| }; |
| |
| /* ATCP - to be supported */ |
| /* OSINLCP - to be supported */ |
| /* BVCP - to be supported */ |
| /* BCP - to be supported */ |
| /* IPXCP - to be supported */ |
| /* MPLSCP - to be supported */ |
| |
| /* Auth Algorithms */ |
| |
| /* 0-4 Reserved (RFC1994) */ |
| #define AUTHALG_CHAPMD5 5 /* RFC1994 */ |
| #define AUTHALG_MSCHAP1 128 /* RFC2433 */ |
| #define AUTHALG_MSCHAP2 129 /* RFC2795 */ |
| |
| struct tok authalg_values[] = { |
| { AUTHALG_CHAPMD5, "MD5" }, |
| { AUTHALG_MSCHAP1, "MS-CHAPv1" }, |
| { AUTHALG_MSCHAP2, "MS-CHAPv2" }, |
| { 0, NULL } |
| }; |
| |
| /* FCS Alternatives - to be supported */ |
| |
| /* Multilink Endpoint Discriminator (RFC1717) */ |
| #define MEDCLASS_NULL 0 /* Null Class */ |
| #define MEDCLASS_LOCAL 1 /* Locally Assigned */ |
| #define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */ |
| #define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */ |
| #define MEDCLASS_MNB 4 /* PPP Magic Number Block */ |
| #define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */ |
| |
| /* PPP LCP Callback */ |
| #define CALLBACK_AUTH 0 /* Location determined by user auth */ |
| #define CALLBACK_DSTR 1 /* Dialing string */ |
| #define CALLBACK_LID 2 /* Location identifier */ |
| #define CALLBACK_E164 3 /* E.164 number */ |
| #define CALLBACK_X500 4 /* X.500 distinguished name */ |
| #define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */ |
| |
| struct tok ppp_callback_values[] = { |
| { CALLBACK_AUTH, "UserAuth" }, |
| { CALLBACK_DSTR, "DialString" }, |
| { CALLBACK_LID, "LocalID" }, |
| { CALLBACK_E164, "E.164" }, |
| { CALLBACK_X500, "X.500" }, |
| { CALLBACK_CBCP, "CBCP" }, |
| { 0, NULL } |
| }; |
| |
| /* CHAP */ |
| |
| #define CHAP_CHAL 1 |
| #define CHAP_RESP 2 |
| #define CHAP_SUCC 3 |
| #define CHAP_FAIL 4 |
| |
| struct tok chapcode_values[] = { |
| { CHAP_CHAL, "Challenge" }, |
| { CHAP_RESP, "Response" }, |
| { CHAP_SUCC, "Success" }, |
| { CHAP_FAIL, "Fail" }, |
| { 0, NULL} |
| }; |
| |
| /* PAP */ |
| |
| #define PAP_AREQ 1 |
| #define PAP_AACK 2 |
| #define PAP_ANAK 3 |
| |
| struct tok papcode_values[] = { |
| { PAP_AREQ, "Auth-Req" }, |
| { PAP_AACK, "Auth-ACK" }, |
| { PAP_ANAK, "Auth-NACK" }, |
| { 0, NULL } |
| }; |
| |
| /* BAP */ |
| #define BAP_CALLREQ 1 |
| #define BAP_CALLRES 2 |
| #define BAP_CBREQ 3 |
| #define BAP_CBRES 4 |
| #define BAP_LDQREQ 5 |
| #define BAP_LDQRES 6 |
| #define BAP_CSIND 7 |
| #define BAP_CSRES 8 |
| |
| static void handle_ctrl_proto (u_int proto,const u_char *p, int length); |
| static void handle_chap (const u_char *p, int length); |
| static void handle_pap (const u_char *p, int length); |
| static void handle_bap (const u_char *p, int length); |
| static void handle_mlppp(const u_char *p, int length); |
| static int print_lcp_config_options (const u_char *p, int); |
| static int print_ipcp_config_options (const u_char *p, int); |
| static int print_ip6cp_config_options (const u_char *p, int); |
| static int print_ccp_config_options (const u_char *p, int); |
| static int print_bacp_config_options (const u_char *p, int); |
| static void handle_ppp (u_int proto, const u_char *p, int length); |
| static void ppp_hdlc(const u_char *p, int length); |
| |
| /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */ |
| static void |
| handle_ctrl_proto(u_int proto, const u_char *pptr, int length) |
| { |
| const char *typestr; |
| u_int code, len; |
| int (*pfunc)(const u_char *, int); |
| int x, j; |
| const u_char *tptr; |
| |
| tptr=pptr; |
| |
| typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto); |
| printf("%s, ",typestr); |
| |
| if (length < 4) /* FIXME weak boundary checking */ |
| goto trunc; |
| TCHECK2(*tptr, 2); |
| |
| code = *tptr++; |
| |
| printf("%s (0x%02x), id %u, length %u", |
| tok2str(cpcodes, "Unknown Opcode",code), |
| code, |
| *tptr++, /* ID */ |
| length+2); |
| |
| if (!vflag) |
| return; |
| |
| if (length <= 4) |
| return; /* there may be a NULL confreq etc. */ |
| |
| TCHECK2(*tptr, 2); |
| len = EXTRACT_16BITS(tptr); |
| tptr += 2; |
| |
| printf("\n\tencoded length %u (=Option(s) length %u)",len,len-4); |
| |
| if (vflag>1) |
| print_unknown_data(pptr-2,"\n\t",6); |
| |
| |
| switch (code) { |
| case CPCODES_VEXT: |
| if (length < 11) |
| break; |
| TCHECK2(*tptr, 4); |
| printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); |
| tptr += 4; |
| TCHECK2(*tptr, 3); |
| printf(" Vendor: %s (%u)", |
| tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)), |
| EXTRACT_24BITS(tptr)); |
| /* XXX: need to decode Kind and Value(s)? */ |
| break; |
| case CPCODES_CONF_REQ: |
| case CPCODES_CONF_ACK: |
| case CPCODES_CONF_NAK: |
| case CPCODES_CONF_REJ: |
| x = len - 4; /* Code(1), Identifier(1) and Length(2) */ |
| do { |
| switch (proto) { |
| case PPP_LCP: |
| pfunc = print_lcp_config_options; |
| break; |
| case PPP_IPCP: |
| pfunc = print_ipcp_config_options; |
| break; |
| case PPP_IPV6CP: |
| pfunc = print_ip6cp_config_options; |
| break; |
| case PPP_CCP: |
| pfunc = print_ccp_config_options; |
| break; |
| case PPP_BACP: |
| pfunc = print_bacp_config_options; |
| break; |
| default: |
| /* |
| * No print routine for the options for |
| * this protocol. |
| */ |
| pfunc = NULL; |
| break; |
| } |
| |
| if (pfunc == NULL) /* catch the above null pointer if unknown CP */ |
| break; |
| |
| if ((j = (*pfunc)(tptr, len)) == 0) |
| break; |
| x -= j; |
| tptr += j; |
| } while (x > 0); |
| break; |
| |
| case CPCODES_TERM_REQ: |
| case CPCODES_TERM_ACK: |
| /* XXX: need to decode Data? */ |
| break; |
| case CPCODES_CODE_REJ: |
| /* XXX: need to decode Rejected-Packet? */ |
| break; |
| case CPCODES_PROT_REJ: |
| if (length < 6) |
| break; |
| TCHECK2(*tptr, 2); |
| printf("\n\t Rejected %s Protocol (0x%04x)", |
| tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)), |
| EXTRACT_16BITS(tptr)); |
| /* XXX: need to decode Rejected-Information? - hexdump for now */ |
| if (len > 6) { |
| printf("\n\t Rejected Packet"); |
| print_unknown_data(tptr+2,"\n\t ",len-2); |
| } |
| break; |
| case CPCODES_ECHO_REQ: |
| case CPCODES_ECHO_RPL: |
| case CPCODES_DISC_REQ: |
| if (length < 8) |
| break; |
| TCHECK2(*tptr, 4); |
| printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); |
| /* XXX: need to decode Data? - hexdump for now */ |
| if (len > 8) { |
| printf("\n\t -----trailing data-----"); |
| TCHECK2(tptr[4], len-8); |
| print_unknown_data(tptr+4,"\n\t ",len-8); |
| } |
| break; |
| case CPCODES_ID: |
| if (length < 8) |
| break; |
| TCHECK2(*tptr, 4); |
| printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); |
| /* RFC 1661 says this is intended to be human readable */ |
| if (len > 8) { |
| printf("\n\t Message\n\t "); |
| fn_printn(tptr+4,len-4,snapend); |
| } |
| break; |
| case CPCODES_TIME_REM: |
| if (length < 12) |
| break; |
| TCHECK2(*tptr, 4); |
| printf("\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)); |
| TCHECK2(*(tptr + 4), 4); |
| printf(", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4)); |
| /* XXX: need to decode Message? */ |
| break; |
| default: |
| /* XXX this is dirty but we do not get the |
| * original pointer passed to the begin |
| * the PPP packet */ |
| if (vflag <= 1) |
| print_unknown_data(pptr-2,"\n\t ",length+2); |
| break; |
| } |
| return; |
| |
| trunc: |
| printf("[|%s]", typestr); |
| } |
| |
| /* LCP config options */ |
| static int |
| print_lcp_config_options(const u_char *p, int length) |
| { |
| int len, opt; |
| |
| if (length < 2) |
| return 0; |
| TCHECK2(*p, 2); |
| len = p[1]; |
| opt = p[0]; |
| if (length < len) |
| return 0; |
| if (len < 2) { |
| if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) |
| printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", lcpconfopts[opt],opt,len); |
| else |
| printf("\n\tunknown LCP option 0x%02x", opt); |
| return 0; |
| } |
| if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) |
| printf("\n\t %s Option (0x%02x), length %u: ", lcpconfopts[opt],opt,len); |
| else { |
| printf("\n\tunknown LCP option 0x%02x", opt); |
| return len; |
| } |
| |
| switch (opt) { |
| case LCPOPT_VEXT: |
| if (len >= 6) { |
| TCHECK2(*(p + 2), 3); |
| printf("Vendor: %s (%u)", |
| tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)), |
| EXTRACT_24BITS(p+2)); |
| #if 0 |
| TCHECK(p[5]); |
| printf(", kind: 0x%02x", p[5]); |
| printf(", Value: 0x") |
| for (i = 0; i < len - 6; i++) { |
| TCHECK(p[6 + i]); |
| printf("%02x", p[6 + i]); |
| } |
| #endif |
| } |
| break; |
| case LCPOPT_MRU: |
| if (len == 4) { |
| TCHECK2(*(p + 2), 2); |
| printf("%u", EXTRACT_16BITS(p + 2)); |
| } |
| break; |
| case LCPOPT_ACCM: |
| if (len == 6) { |
| TCHECK2(*(p + 2), 4); |
| printf("0x%08x", EXTRACT_32BITS(p + 2)); |
| } |
| break; |
| case LCPOPT_AP: |
| if (len >= 4) { |
| TCHECK2(*(p + 2), 2); |
| printf("%s", tok2str(ppptype2str,"Unknown Auth Proto (0x04x)",EXTRACT_16BITS(p+2))); |
| |
| switch (EXTRACT_16BITS(p+2)) { |
| case PPP_CHAP: |
| TCHECK(p[4]); |
| printf(", %s",tok2str(authalg_values,"Unknown Auth Alg %u",p[4])); |
| break; |
| case PPP_PAP: /* fall through */ |
| case PPP_EAP: |
| case PPP_SPAP: |
| case PPP_SPAP_OLD: |
| break; |
| default: |
| print_unknown_data(p,"\n\t",len); |
| } |
| } |
| break; |
| case LCPOPT_QP: |
| if (len >= 4) { |
| TCHECK2(*(p + 2), 2); |
| if (EXTRACT_16BITS(p+2) == PPP_LQM) |
| printf(" LQR"); |
| else |
| printf(" unknown"); |
| } |
| break; |
| case LCPOPT_MN: |
| if (len == 6) { |
| TCHECK2(*(p + 2), 4); |
| printf("0x%08x", EXTRACT_32BITS(p + 2)); |
| } |
| break; |
| case LCPOPT_PFC: |
| break; |
| case LCPOPT_ACFC: |
| break; |
| case LCPOPT_LD: |
| if (len == 4) { |
| TCHECK2(*(p + 2), 2); |
| printf("0x%04x", EXTRACT_16BITS(p + 2)); |
| } |
| break; |
| case LCPOPT_CBACK: |
| if (len < 3) |
| break; |
| TCHECK(p[2]); |
| printf("Callback Operation %s (%u)", |
| tok2str(ppp_callback_values,"Unknown",p[2]), |
| p[2]); |
| break; |
| case LCPOPT_MLMRRU: |
| if (len == 4) { |
| TCHECK2(*(p + 2), 2); |
| printf("%u", EXTRACT_16BITS(p + 2)); |
| } |
| break; |
| case LCPOPT_MLED: |
| if (len < 3) |
| break; |
| TCHECK(p[2]); |
| switch (p[2]) { /* class */ |
| case MEDCLASS_NULL: |
| printf("Null"); |
| break; |
| case MEDCLASS_LOCAL: |
| printf("Local"); /* XXX */ |
| break; |
| case MEDCLASS_IPV4: |
| if (len != 7) |
| break; |
| TCHECK2(*(p + 3), 4); |
| printf("IPv4 %s", ipaddr_string(p + 3)); |
| break; |
| case MEDCLASS_MAC: |
| if (len != 9) |
| break; |
| TCHECK(p[8]); |
| printf("MAC %02x:%02x:%02x:%02x:%02x:%02x", |
| p[3], p[4], p[5], p[6], p[7], p[8]); |
| break; |
| case MEDCLASS_MNB: |
| printf("Magic-Num-Block"); /* XXX */ |
| break; |
| case MEDCLASS_PSNDN: |
| printf("PSNDN"); /* XXX */ |
| break; |
| } |
| break; |
| |
| /* XXX: to be supported */ |
| #if 0 |
| case LCPOPT_DEP6: |
| case LCPOPT_FCSALT: |
| case LCPOPT_SDP: |
| case LCPOPT_NUMMODE: |
| case LCPOPT_DEP12: |
| case LCPOPT_DEP14: |
| case LCPOPT_DEP15: |
| case LCPOPT_DEP16: |
| case LCPOPT_MLSSNHF: |
| case LCPOPT_PROP: |
| case LCPOPT_DCEID: |
| case LCPOPT_MPP: |
| case LCPOPT_LCPAOPT: |
| case LCPOPT_COBS: |
| case LCPOPT_PE: |
| case LCPOPT_MLHF: |
| case LCPOPT_I18N: |
| case LCPOPT_SDLOS: |
| case LCPOPT_PPPMUX: |
| break; |
| #endif |
| default: |
| if(vflag<2) |
| print_unknown_data(&p[2],"\n\t ",len-2); |
| break; |
| } |
| |
| if (vflag>1) |
| print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ |
| |
| return len; |
| |
| trunc: |
| printf("[|lcp]"); |
| return 0; |
| } |
| |
| /* ML-PPP*/ |
| struct tok ppp_ml_flag_values[] = { |
| { 0x80, "begin" }, |
| { 0x40, "end" }, |
| { 0, NULL } |
| }; |
| |
| static void |
| handle_mlppp(const u_char *p, int length) { |
| |
| if (!eflag) |
| printf("MLPPP, "); |
| |
| printf("seq 0x%03x, Flags [%s], length %u", |
| (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */ |
| bittok2str(ppp_ml_flag_values, "none", *p & 0xc0), |
| length); |
| |
| return; |
| } |
| |
| /* CHAP */ |
| static void |
| handle_chap(const u_char *p, int length) |
| { |
| u_int code, len; |
| int val_size, name_size, msg_size; |
| const u_char *p0; |
| int i; |
| |
| p0 = p; |
| if (length < 1) { |
| printf("[|chap]"); |
| return; |
| } else if (length < 4) { |
| TCHECK(*p); |
| printf("[|chap 0x%02x]", *p); |
| return; |
| } |
| |
| TCHECK(*p); |
| code = *p; |
| printf("CHAP, %s (0x%02x)", |
| tok2str(chapcode_values,"unknown",code), |
| code); |
| p++; |
| |
| TCHECK(*p); |
| printf(", id %u", *p); /* ID */ |
| p++; |
| |
| TCHECK2(*p, 2); |
| len = EXTRACT_16BITS(p); |
| p += 2; |
| |
| /* |
| * Note that this is a generic CHAP decoding routine. Since we |
| * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1, |
| * MS-CHAPv2) is used at this point, we can't decode packet |
| * specifically to each algorithms. Instead, we simply decode |
| * the GCD (Gratest Common Denominator) for all algorithms. |
| */ |
| switch (code) { |
| case CHAP_CHAL: |
| case CHAP_RESP: |
| if (length - (p - p0) < 1) |
| return; |
| TCHECK(*p); |
| val_size = *p; /* value size */ |
| p++; |
| if (length - (p - p0) < val_size) |
| return; |
| printf(", Value "); |
| for (i = 0; i < val_size; i++) { |
| TCHECK(*p); |
| printf("%02x", *p++); |
| } |
| name_size = len - (p - p0); |
| printf(", Name "); |
| for (i = 0; i < name_size; i++) { |
| TCHECK(*p); |
| safeputchar(*p++); |
| } |
| break; |
| case CHAP_SUCC: |
| case CHAP_FAIL: |
| msg_size = len - (p - p0); |
| printf(", Msg "); |
| for (i = 0; i< msg_size; i++) { |
| TCHECK(*p); |
| safeputchar(*p++); |
| } |
| break; |
| } |
| return; |
| |
| trunc: |
| printf("[|chap]"); |
| } |
| |
| /* PAP (see RFC 1334) */ |
| static void |
| handle_pap(const u_char *p, int length) |
| { |
| u_int code, len; |
| int peerid_len, passwd_len, msg_len; |
| const u_char *p0; |
| int i; |
| |
| p0 = p; |
| if (length < 1) { |
| printf("[|pap]"); |
| return; |
| } else if (length < 4) { |
| TCHECK(*p); |
| printf("[|pap 0x%02x]", *p); |
| return; |
| } |
| |
| TCHECK(*p); |
| code = *p; |
| printf("PAP, %s (0x%02x)", |
| tok2str(papcode_values,"unknown",code), |
| code); |
| p++; |
| |
| TCHECK(*p); |
| printf(", id %u", *p); /* ID */ |
| p++; |
| |
| TCHECK2(*p, 2); |
| len = EXTRACT_16BITS(p); |
| p += 2; |
| |
| if ((int)len > length) { |
| printf(", length %u > packet size", len); |
| return; |
| } |
| length = len; |
| if (length < (p - p0)) { |
| printf(", length %u < PAP header length", length); |
| return; |
| } |
| |
| switch (code) { |
| case PAP_AREQ: |
| if (length - (p - p0) < 1) |
| return; |
| TCHECK(*p); |
| peerid_len = *p; /* Peer-ID Length */ |
| p++; |
| if (length - (p - p0) < peerid_len) |
| return; |
| printf(", Peer "); |
| for (i = 0; i < peerid_len; i++) { |
| TCHECK(*p); |
| safeputchar(*p++); |
| } |
| |
| if (length - (p - p0) < 1) |
| return; |
| TCHECK(*p); |
| passwd_len = *p; /* Password Length */ |
| p++; |
| if (length - (p - p0) < passwd_len) |
| return; |
| printf(", Name "); |
| for (i = 0; i < passwd_len; i++) { |
| TCHECK(*p); |
| safeputchar(*p++); |
| } |
| break; |
| case PAP_AACK: |
| case PAP_ANAK: |
| if (length - (p - p0) < 1) |
| return; |
| TCHECK(*p); |
| msg_len = *p; /* Msg-Length */ |
| p++; |
| if (length - (p - p0) < msg_len) |
| return; |
| printf(", Msg "); |
| for (i = 0; i< msg_len; i++) { |
| TCHECK(*p); |
| safeputchar(*p++); |
| } |
| break; |
| } |
| return; |
| |
| trunc: |
| printf("[|pap]"); |
| } |
| |
| /* BAP */ |
| static void |
| handle_bap(const u_char *p _U_, int length _U_) |
| { |
| /* XXX: to be supported!! */ |
| } |
| |
| |
| /* IPCP config options */ |
| static int |
| print_ipcp_config_options(const u_char *p, int length) |
| { |
| int len, opt; |
| u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen; |
| |
| if (length < 2) |
| return 0; |
| TCHECK2(*p, 2); |
| len = p[1]; |
| opt = p[0]; |
| if (length < len) |
| return 0; |
| if (len < 2) { |
| printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", |
| tok2str(ipcpopt_values,"unknown",opt), |
| opt, |
| len); |
| return 0; |
| } |
| |
| printf("\n\t %s Option (0x%02x), length %u: ", |
| tok2str(ipcpopt_values,"unknown",opt), |
| opt, |
| len); |
| |
| switch (opt) { |
| case IPCPOPT_2ADDR: /* deprecated */ |
| if (len != 10) |
| goto invlen; |
| TCHECK2(*(p + 6), 4); |
| printf("src %s, dst %s", |
| ipaddr_string(p + 2), |
| ipaddr_string(p + 6)); |
| break; |
| case IPCPOPT_IPCOMP: |
| if (len < 4) |
| goto invlen; |
| TCHECK2(*(p + 2), 2); |
| compproto = EXTRACT_16BITS(p+2); |
| |
| printf("%s (0x%02x):", |
| tok2str(ipcpopt_compproto_values,"Unknown",compproto), |
| compproto); |
| |
| switch (compproto) { |
| case PPP_VJC: |
| /* XXX: VJ-Comp parameters should be decoded */ |
| break; |
| case IPCPOPT_IPCOMP_HDRCOMP: |
| if (len < IPCPOPT_IPCOMP_MINLEN) |
| goto invlen; |
| |
| TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN); |
| printf("\n\t TCP Space %u, non-TCP Space %u" \ |
| ", maxPeriod %u, maxTime %u, maxHdr %u", |
| EXTRACT_16BITS(p+4), |
| EXTRACT_16BITS(p+6), |
| EXTRACT_16BITS(p+8), |
| EXTRACT_16BITS(p+10), |
| EXTRACT_16BITS(p+12)); |
| |
| /* suboptions present ? */ |
| if (len > IPCPOPT_IPCOMP_MINLEN) { |
| ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN; |
| p += IPCPOPT_IPCOMP_MINLEN; |
| |
| printf("\n\t Suboptions, length %u", ipcomp_subopttotallen); |
| |
| while (ipcomp_subopttotallen >= 2) { |
| TCHECK2(*p, 2); |
| ipcomp_subopt = *p; |
| ipcomp_suboptlen = *(p+1); |
| |
| /* sanity check */ |
| if (ipcomp_subopt == 0 || |
| ipcomp_suboptlen == 0 ) |
| break; |
| |
| /* XXX: just display the suboptions for now */ |
| printf("\n\t\t%s Suboption #%u, length %u", |
| tok2str(ipcpopt_compproto_subopt_values, |
| "Unknown", |
| ipcomp_subopt), |
| ipcomp_subopt, |
| ipcomp_suboptlen); |
| |
| ipcomp_subopttotallen -= ipcomp_suboptlen; |
| p += ipcomp_suboptlen; |
| } |
| } |
| break; |
| default: |
| break; |
| } |
| break; |
| |
| case IPCPOPT_ADDR: /* those options share the same format - fall through */ |
| case IPCPOPT_MOBILE4: |
| case IPCPOPT_PRIDNS: |
| case IPCPOPT_PRINBNS: |
| case IPCPOPT_SECDNS: |
| case IPCPOPT_SECNBNS: |
| if (len != 6) |
| goto invlen; |
| TCHECK2(*(p + 2), 4); |
| printf("%s", ipaddr_string(p + 2)); |
| break; |
| default: |
| if(vflag<2) |
| print_unknown_data(&p[2],"\n\t ",len-2); |
| break; |
| } |
| if (vflag>1) |
| print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ |
| return len; |
| |
| invlen: |
| printf(", invalid-length-%d", opt); |
| return 0; |
| |
| trunc: |
| printf("[|ipcp]"); |
| return 0; |
| } |
| |
| /* IP6CP config options */ |
| static int |
| print_ip6cp_config_options(const u_char *p, int length) |
| { |
| int len, opt; |
| |
| if (length < 2) |
| return 0; |
| TCHECK2(*p, 2); |
| len = p[1]; |
| opt = p[0]; |
| if (length < len) |
| return 0; |
| if (len < 2) { |
| printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", |
| tok2str(ip6cpopt_values,"unknown",opt), |
| opt, |
| len); |
| return 0; |
| } |
| |
| printf("\n\t %s Option (0x%02x), length %u: ", |
| tok2str(ip6cpopt_values,"unknown",opt), |
| opt, |
| len); |
| |
| switch (opt) { |
| case IP6CP_IFID: |
| if (len != 10) |
| goto invlen; |
| TCHECK2(*(p + 2), 8); |
| printf("%04x:%04x:%04x:%04x", |
| EXTRACT_16BITS(p + 2), |
| EXTRACT_16BITS(p + 4), |
| EXTRACT_16BITS(p + 6), |
| EXTRACT_16BITS(p + 8)); |
| break; |
| default: |
| if(vflag<2) |
| print_unknown_data(&p[2],"\n\t ",len-2); |
| break; |
| } |
| if (vflag>1) |
| print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ |
| |
| return len; |
| |
| invlen: |
| printf(", invalid-length-%d", opt); |
| return 0; |
| |
| trunc: |
| printf("[|ip6cp]"); |
| return 0; |
| } |
| |
| |
| /* CCP config options */ |
| static int |
| print_ccp_config_options(const u_char *p, int length) |
| { |
| int len, opt; |
| |
| if (length < 2) |
| return 0; |
| TCHECK2(*p, 2); |
| len = p[1]; |
| opt = p[0]; |
| if (length < len) |
| return 0; |
| if (len < 2) { |
| printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", |
| tok2str(ccpconfopts_values, "Unknown", opt), |
| opt, |
| len); |
| return 0; |
| } |
| |
| printf("\n\t %s Option (0x%02x), length %u:", |
| tok2str(ccpconfopts_values, "Unknown", opt), |
| opt, |
| len); |
| |
| switch (opt) { |
| /* fall through --> default: nothing supported yet */ |
| case CCPOPT_OUI: |
| case CCPOPT_PRED1: |
| case CCPOPT_PRED2: |
| case CCPOPT_PJUMP: |
| case CCPOPT_HPPPC: |
| case CCPOPT_STACLZS: |
| case CCPOPT_MPPC: |
| case CCPOPT_GFZA: |
| case CCPOPT_V42BIS: |
| case CCPOPT_BSDCOMP: |
| case CCPOPT_LZSDCP: |
| case CCPOPT_MVRCA: |
| case CCPOPT_DEC: |
| case CCPOPT_DEFLATE: |
| case CCPOPT_RESV: |
| default: |
| if(vflag<2) |
| print_unknown_data(&p[2],"\n\t ",len-2); |
| break; |
| } |
| if (vflag>1) |
| print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ |
| |
| return len; |
| |
| trunc: |
| printf("[|ccp]"); |
| return 0; |
| } |
| |
| /* BACP config options */ |
| static int |
| print_bacp_config_options(const u_char *p, int length) |
| { |
| int len, opt; |
| |
| if (length < 2) |
| return 0; |
| TCHECK2(*p, 2); |
| len = p[1]; |
| opt = p[0]; |
| if (length < len) |
| return 0; |
| if (len < 2) { |
| printf("\n\t %s Option (0x%02x), length %u (bogus, should be >= 2)", |
| tok2str(bacconfopts_values, "Unknown", opt), |
| opt, |
| len); |
| return 0; |
| } |
| |
| printf("\n\t %s Option (0x%02x), length %u:", |
| tok2str(bacconfopts_values, "Unknown", opt), |
| opt, |
| len); |
| |
| switch (opt) { |
| case BACPOPT_FPEER: |
| TCHECK2(*(p + 2), 4); |
| printf(", Magic-Num 0x%08x", EXTRACT_32BITS(p + 2)); |
| break; |
| default: |
| if(vflag<2) |
| print_unknown_data(&p[2],"\n\t ",len-2); |
| break; |
| } |
| if (vflag>1) |
| print_unknown_data(&p[2],"\n\t ",len-2); /* exclude TLV header */ |
| |
| return len; |
| |
| trunc: |
| printf("[|bacp]"); |
| return 0; |
| } |
| |
| |
| static void |
| ppp_hdlc(const u_char *p, int length) |
| { |
| u_char *b, *s, *t, c; |
| int i, proto; |
| const void *se; |
| |
| b = (u_int8_t *)malloc(length); |
| if (b == NULL) |
| return; |
| |
| /* |
| * Unescape all the data into a temporary, private, buffer. |
| * Do this so that we dont overwrite the original packet |
| * contents. |
| */ |
| for (s = (u_char *)p, t = b, i = length; i > 0; i--) { |
| c = *s++; |
| if (c == 0x7d) { |
| if (i > 1) { |
| i--; |
| c = *s++ ^ 0x20; |
| } else |
| continue; |
| } |
| *t++ = c; |
| } |
| |
| se = snapend; |
| snapend = t; |
| |
| /* now lets guess about the payload codepoint format */ |
| proto = *b; /* start with a one-octet codepoint guess */ |
| |
| switch (proto) { |
| case PPP_IP: |
| ip_print(gndo, b+1, t - b - 1); |
| goto cleanup; |
| #ifdef INET6 |
| case PPP_IPV6: |
| ip6_print(b+1, t - b - 1); |
| goto cleanup; |
| #endif |
| default: /* no luck - try next guess */ |
| break; |
| } |
| |
| proto = EXTRACT_16BITS(b); /* next guess - load two octets */ |
| |
| switch (proto) { |
| case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */ |
| proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */ |
| handle_ppp(proto, b+4, t - b - 4); |
| break; |
| default: /* last guess - proto must be a PPP proto-id */ |
| handle_ppp(proto, b+2, t - b - 2); |
| break; |
| } |
| |
| cleanup: |
| snapend = se; |
| free(b); |
| return; |
| } |
| |
| |
| /* PPP */ |
| static void |
| handle_ppp(u_int proto, const u_char *p, int length) |
| { |
| if ((proto & 0xff00) == 0x7e00) {/* is this an escape code ? */ |
| ppp_hdlc(p-1, length); |
| return; |
| } |
| |
| switch (proto) { |
| case PPP_LCP: /* fall through */ |
| case PPP_IPCP: |
| case PPP_OSICP: |
| case PPP_MPLSCP: |
| case PPP_IPV6CP: |
| case PPP_CCP: |
| case PPP_BACP: |
| handle_ctrl_proto(proto, p, length); |
| break; |
| case PPP_ML: |
| handle_mlppp(p, length); |
| break; |
| case PPP_CHAP: |
| handle_chap(p, length); |
| break; |
| case PPP_PAP: |
| handle_pap(p, length); |
| break; |
| case PPP_BAP: /* XXX: not yet completed */ |
| handle_bap(p, length); |
| break; |
| case ETHERTYPE_IP: /*XXX*/ |
| case PPP_VJNC: |
| case PPP_IP: |
| ip_print(gndo, p, length); |
| break; |
| #ifdef INET6 |
| case ETHERTYPE_IPV6: /*XXX*/ |
| case PPP_IPV6: |
| ip6_print(p, length); |
| break; |
| #endif |
| case ETHERTYPE_IPX: /*XXX*/ |
| case PPP_IPX: |
| ipx_print(p, length); |
| break; |
| case PPP_OSI: |
| isoclns_print(p, length, length); |
| break; |
| case PPP_MPLS_UCAST: |
| case PPP_MPLS_MCAST: |
| mpls_print(p, length); |
| break; |
| case PPP_COMP: |
| printf("compressed PPP data"); |
| break; |
| default: |
| printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); |
| print_unknown_data(p,"\n\t",length); |
| break; |
| } |
| } |
| |
| /* Standard PPP printer */ |
| u_int |
| ppp_print(register const u_char *p, u_int length) |
| { |
| u_int proto,ppp_header; |
| u_int olen = length; /* _o_riginal length */ |
| u_int hdr_len = 0; |
| |
| /* |
| * Here, we assume that p points to the Address and Control |
| * field (if they present). |
| */ |
| if (length < 2) |
| goto trunc; |
| TCHECK2(*p, 2); |
| ppp_header = EXTRACT_16BITS(p); |
| |
| switch(ppp_header) { |
| case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL): |
| if (eflag) printf("In "); |
| p += 2; |
| length -= 2; |
| hdr_len += 2; |
| break; |
| case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL): |
| if (eflag) printf("Out "); |
| p += 2; |
| length -= 2; |
| hdr_len += 2; |
| break; |
| case (PPP_ADDRESS << 8 | PPP_CONTROL): |
| p += 2; /* ACFC not used */ |
| length -= 2; |
| hdr_len += 2; |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (length < 2) |
| goto trunc; |
| TCHECK(*p); |
| if (*p % 2) { |
| proto = *p; /* PFC is used */ |
| p++; |
| length--; |
| hdr_len++; |
| } else { |
| TCHECK2(*p, 2); |
| proto = EXTRACT_16BITS(p); |
| p += 2; |
| length -= 2; |
| hdr_len += 2; |
| } |
| |
| if (eflag) |
| printf("%s (0x%04x), length %u: ", |
| tok2str(ppptype2str, "unknown", proto), |
| proto, |
| olen); |
| |
| handle_ppp(proto, p, length); |
| return (hdr_len); |
| trunc: |
| printf("[|ppp]"); |
| return (0); |
| } |
| |
| |
| /* PPP I/F printer */ |
| u_int |
| ppp_if_print(const struct pcap_pkthdr *h, register const u_char *p) |
| { |
| register u_int length = h->len; |
| register u_int caplen = h->caplen; |
| |
| if (caplen < PPP_HDRLEN) { |
| printf("[|ppp]"); |
| return (caplen); |
| } |
| |
| #if 0 |
| /* |
| * XXX: seems to assume that there are 2 octets prepended to an |
| * actual PPP frame. The 1st octet looks like Input/Output flag |
| * while 2nd octet is unknown, at least to me |
| * (mshindo@mshindo.net). |
| * |
| * That was what the original tcpdump code did. |
| * |
| * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound |
| * packets and 0 for inbound packets - but only if the |
| * protocol field has the 0x8000 bit set (i.e., it's a network |
| * control protocol); it does so before running the packet through |
| * "bpf_filter" to see if it should be discarded, and to see |
| * if we should update the time we sent the most recent packet... |
| * |
| * ...but it puts the original address field back after doing |
| * so. |
| * |
| * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion. |
| * |
| * I don't know if any PPP implementation handed up to a BPF |
| * device packets with the first octet being 1 for outbound and |
| * 0 for inbound packets, so I (guy@alum.mit.edu) don't know |
| * whether that ever needs to be checked or not. |
| * |
| * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP, |
| * and its tcpdump appears to assume that the frame always |
| * begins with an address field and a control field, and that |
| * the address field might be 0x0f or 0x8f, for Cisco |
| * point-to-point with HDLC framing as per section 4.3.1 of RFC |
| * 1547, as well as 0xff, for PPP in HDLC-like framing as per |
| * RFC 1662. |
| * |
| * (Is the Cisco framing in question what DLT_C_HDLC, in |
| * BSD/OS, is?) |
| */ |
| if (eflag) |
| printf("%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]); |
| #endif |
| |
| ppp_print(p, length); |
| |
| return (0); |
| } |
| |
| /* |
| * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like |
| * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547, |
| * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL, |
| * discard them *if* those are the first two octets, and parse the remaining |
| * packet as a PPP packet, as "ppp_print()" does). |
| * |
| * This handles, for example, DLT_PPP_SERIAL in NetBSD. |
| */ |
| u_int |
| ppp_hdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p) |
| { |
| register u_int length = h->len; |
| register u_int caplen = h->caplen; |
| u_int proto; |
| u_int hdrlen = 0; |
| |
| if (caplen < 2) { |
| printf("[|ppp]"); |
| return (caplen); |
| } |
| |
| switch (p[0]) { |
| |
| case PPP_ADDRESS: |
| if (caplen < 4) { |
| printf("[|ppp]"); |
| return (caplen); |
| } |
| |
| if (eflag) |
| printf("%02x %02x %d ", p[0], p[1], length); |
| p += 2; |
| length -= 2; |
| hdrlen += 2; |
| |
| proto = EXTRACT_16BITS(p); |
| p += 2; |
| length -= 2; |
| hdrlen += 2; |
| printf("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)); |
| |
| handle_ppp(proto, p, length); |
| break; |
| |
| case CHDLC_UNICAST: |
| case CHDLC_BCAST: |
| return (chdlc_if_print(h, p)); |
| |
| default: |
| if (eflag) |
| printf("%02x %02x %d ", p[0], p[1], length); |
| p += 2; |
| length -= 2; |
| hdrlen += 2; |
| |
| /* |
| * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats |
| * the next two octets as an Ethernet type; does that |
| * ever happen? |
| */ |
| printf("unknown addr %02x; ctrl %02x", p[0], p[1]); |
| break; |
| } |
| |
| return (hdrlen); |
| } |
| |
| #define PPP_BSDI_HDRLEN 24 |
| |
| /* BSD/OS specific PPP printer */ |
| u_int |
| ppp_bsdos_if_print(const struct pcap_pkthdr *h _U_, register const u_char *p _U_) |
| { |
| register int hdrlength; |
| #ifdef __bsdi__ |
| register u_int length = h->len; |
| register u_int caplen = h->caplen; |
| u_int16_t ptype; |
| const u_char *q; |
| int i; |
| |
| if (caplen < PPP_BSDI_HDRLEN) { |
| printf("[|ppp]"); |
| return (caplen) |
| } |
| |
| hdrlength = 0; |
| |
| #if 0 |
| if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) { |
| if (eflag) |
| printf("%02x %02x ", p[0], p[1]); |
| p += 2; |
| hdrlength = 2; |
| } |
| |
| if (eflag) |
| printf("%d ", length); |
| /* Retrieve the protocol type */ |
| if (*p & 01) { |
| /* Compressed protocol field */ |
| ptype = *p; |
| if (eflag) |
| printf("%02x ", ptype); |
| p++; |
| hdrlength += 1; |
| } else { |
| /* Un-compressed protocol field */ |
| ptype = EXTRACT_16BITS(p); |
| if (eflag) |
| printf("%04x ", ptype); |
| p += 2; |
| hdrlength += 2; |
| } |
| #else |
| ptype = 0; /*XXX*/ |
| if (eflag) |
| printf("%c ", p[SLC_DIR] ? 'O' : 'I'); |
| if (p[SLC_LLHL]) { |
| /* link level header */ |
| struct ppp_header *ph; |
| |
| q = p + SLC_BPFHDRLEN; |
| ph = (struct ppp_header *)q; |
| if (ph->phdr_addr == PPP_ADDRESS |
| && ph->phdr_ctl == PPP_CONTROL) { |
| if (eflag) |
| printf("%02x %02x ", q[0], q[1]); |
| ptype = EXTRACT_16BITS(&ph->phdr_type); |
| if (eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) { |
| printf("%s ", tok2str(ppptype2str, |
| "proto-#%d", ptype)); |
| } |
| } else { |
| if (eflag) { |
| printf("LLH=["); |
| for (i = 0; i < p[SLC_LLHL]; i++) |
| printf("%02x", q[i]); |
| printf("] "); |
| } |
| } |
| } |
| if (eflag) |
| printf("%d ", length); |
| if (p[SLC_CHL]) { |
| q = p + SLC_BPFHDRLEN + p[SLC_LLHL]; |
| |
| switch (ptype) { |
| case PPP_VJC: |
| ptype = vjc_print(q, ptype); |
| hdrlength = PPP_BSDI_HDRLEN; |
| p += hdrlength; |
| switch (ptype) { |
| case PPP_IP: |
| ip_print(p, length); |
| break; |
| #ifdef INET6 |
| case PPP_IPV6: |
| ip6_print(p, length); |
| break; |
| #endif |
| case PPP_MPLS_UCAST: |
| case PPP_MPLS_MCAST: |
| mpls_print(p, length); |
| break; |
| } |
| goto printx; |
| case PPP_VJNC: |
| ptype = vjc_print(q, ptype); |
| hdrlength = PPP_BSDI_HDRLEN; |
| p += hdrlength; |
| switch (ptype) { |
| case PPP_IP: |
| ip_print(p, length); |
| break; |
| #ifdef INET6 |
| case PPP_IPV6: |
| ip6_print(p, length); |
| break; |
| #endif |
| case PPP_MPLS_UCAST: |
| case PPP_MPLS_MCAST: |
| mpls_print(p, length); |
| break; |
| } |
| goto printx; |
| default: |
| if (eflag) { |
| printf("CH=["); |
| for (i = 0; i < p[SLC_LLHL]; i++) |
| printf("%02x", q[i]); |
| printf("] "); |
| } |
| break; |
| } |
| } |
| |
| hdrlength = PPP_BSDI_HDRLEN; |
| #endif |
| |
| length -= hdrlength; |
| p += hdrlength; |
| |
| switch (ptype) { |
| case PPP_IP: |
| ip_print(p, length); |
| break; |
| #ifdef INET6 |
| case PPP_IPV6: |
| ip6_print(p, length); |
| break; |
| #endif |
| case PPP_MPLS_UCAST: |
| case PPP_MPLS_MCAST: |
| mpls_print(p, length); |
| break; |
| default: |
| printf("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype)); |
| } |
| |
| printx: |
| #else /* __bsdi */ |
| hdrlength = 0; |
| #endif /* __bsdi__ */ |
| return (hdrlength); |
| } |
| |
| |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 8 |
| * End: |
| */ |
