/* $NetBSD: print-ppp.c,v 1.3 2002/02/18 09:37:08 itojun Exp $ */ /* * 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 */ #include #ifndef lint #if 0 static const char rcsid[] = "@(#) Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.64 2001/09/09 02:04:19 guy Exp (LBL)"; #else __RCSID("$NetBSD: print-ppp.c,v 1.3 2002/02/18 09:37:08 itojun Exp $"); #endif #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #ifdef __bsdi__ #include #include #endif #include #include #include #include #include #include "interface.h" #include "extract.h" #include "addrtoname.h" #include "ppp.h" #include "chdlc.h" #include "ethertype.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. */ /* Control Protocols (LCP/IPCP/CCP etc.) Codes */ #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) */ #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) */ #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) */ #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */ #define CPCODES_MIN CPCODES_VEXT #define CPCODES_MAX CPCODES_RESET_REP static const char *cpcodes[] = { /* * Control Protocol code values (RFC1661) */ "Vend-Ext", /* (0) RFC2153 */ "Conf-Req", /* (1) */ "Conf-Ack", /* (2) */ "Conf-Nak", /* (3) */ "Conf-Rej", /* (4) */ "Term-Req", /* (5) */ "Term-Ack", /* (6) */ "Code-Rej", /* (7) */ "Prot-Rej", /* (8) */ "Echo-Req", /* (9) */ "Echo-Rep", /* (10) */ "Disc-Req", /* (11) */ "Ident", /* (12) RFC1570 */ "Time-Rem", /* (13) RFC1570 */ "Reset-Req", /* (14) RFC1962 */ "Reset-Ack", /* (15) RFC1962 */ }; /* 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) */ "SSNHF", /* (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) */ }; /* IPV6CP - to be supported */ /* 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 */ #define CCPOPT_MIN CCPOPT_OUI #define CCPOPT_MAX CCPOPT_DEFLATE /* XXX: should be CCPOPT_RESV but... */ static const char *ccpconfopts[] = { "OUI", /* (0) */ "Pred-1", /* (1) */ "Pred-2", /* (2) */ "Puddle", /* (3) */ "unassigned(4)", /* (4) */ "unassigned(5)", /* (5) */ "unassigned(6)", /* (6) */ "unassigned(7)", /* (7) */ "unassigned(8)", /* (8) */ "unassigned(9)", /* (9) */ "unassigned(10)", /* (10) */ "unassigned(11)", /* (11) */ "unassigned(12)", /* (12) */ "unassigned(13)", /* (13) */ "unassigned(14)", /* (14) */ "unassigned(15)", /* (15) */ "HP-PPC", /* (16) */ "Stac-LZS", /* (17) */ "MPPC", /* (18) */ "Gand-FZA", /* (19) */ "V.42bis", /* (20) */ "BSD-Comp", /* (21) */ "unassigned(22)", /* (22) */ "LZS-DCP", /* (23) */ "MVRCA", /* (24) */ "DEC", /* (25) */ "Deflate", /* (26) */ }; /* BACP Config Options */ #define BACPOPT_FPEER 1 /* RFC2125 */ /* 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 */ /* ATCP - to be supported */ /* OSINLCP - to be supported */ /* BVCP - to be supported */ /* BCP - to be supported */ /* IPXCP - to be supported */ /* Auth Algorithms */ /* 0-4 Reserved (RFC1994) */ #define AUTHALG_CHAPMD5 5 /* RFC1994 */ #define AUTHALG_MSCHAP1 128 /* RFC2433 */ #define AUTHALG_MSCHAP2 129 /* RFC2795 */ /* 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 */ /* CHAP */ #define CHAP_CHAL 1 #define CHAP_RESP 2 #define CHAP_SUCC 3 #define CHAP_FAIL 4 #define CHAP_CODEMIN CHAP_CHAL #define CHAP_CODEMAX CHAP_FAIL static const char *chapcode[] = { "Chal", /* (1) */ "Resp", /* (2) */ "Succ", /* (3) */ "Fail", /* (4) */ }; /* PAP */ #define PAP_AREQ 1 #define PAP_AACK 2 #define PAP_ANAK 3 #define PAP_CODEMIN PAP_AREQ #define PAP_CODEMAX PAP_ANAK static const char *papcode[] = { "Auth-Req", /* (1) */ "Auth-Ack", /* (2) */ "Auth-Nak", /* (3) */ }; /* 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 const char *ppp_protoname (u_int proto); 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 int print_lcp_config_options (const u_char *p, int); static int print_ipcp_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 const char * ppp_protoname(u_int proto) { static char buf[20]; switch (proto) { case PPP_IP: return "IP"; case PPP_IPV6: return "IPv6"; #ifdef PPP_XNS case PPP_XNS: return "XNS"; #endif case PPP_IPX: return "IPX"; case PPP_OSI: return "OSI"; case PPP_VJC: return "VJC"; case PPP_VJNC: return "VJNC"; case PPP_COMP: return "COMP"; case PPP_IPCP: return "IPCP"; case PPP_IPV6CP: return "IPv6CP"; case PPP_IPXCP: return "IPXCP"; case PPP_OSICP: return "OSICP"; case PPP_CCP: return "CCP"; case PPP_LCP: return "LCP"; case PPP_PAP: return "PAP"; #ifdef PPP_LQR case PPP_LQR: return "LQR"; #endif case PPP_CHAP: return "CHAP"; case PPP_BACP: return "BACP"; case PPP_BAP: return "BAP"; default: snprintf(buf, sizeof(buf), "unknown-0x%04x", proto); return buf; } } /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */ static void handle_ctrl_proto(u_int proto, const u_char *p, int length) { u_int code, len; int (*pfunc)(const u_char *, int); int x, j; if (length < 1) { printf("[|%s]", ppp_protoname(proto)); return; } else if (length < 4) { printf("[|%s 0x%02x]", ppp_protoname(proto), *p); return; } code = *p; if ((code >= CPCODES_MIN) && (code <= CPCODES_MAX)) printf("%s", cpcodes[code]); else { printf("0x%02x", code); return; } p++; printf("(%u)", *p); /* ID */ p++; len = EXTRACT_16BITS(p); p += 2; if (length <= 4) return; /* there may be a NULL confreq etc. */ switch (code) { case CPCODES_VEXT: if (length < 11) break; printf(", Magic-Num=%08x", EXTRACT_32BITS(p)); p += 4; printf(" OUI=%02x%02x%02x", p[0], p[1], p[2]); /* 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_CCP: pfunc = print_ccp_config_options; break; case PPP_BACP: pfunc = print_bacp_config_options; break; default: /* * This should never happen, but we set * "pfunc" to squelch uninitialized * variable warnings from compilers. */ pfunc = NULL; break; } if ((j = (*pfunc)(p, len)) == 0) break; x -= j; p += 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; printf(", Rejected-Protocol=%04x", EXTRACT_16BITS(p)); /* XXX: need to decode Rejected-Information? */ break; case CPCODES_ECHO_REQ: case CPCODES_ECHO_RPL: case CPCODES_DISC_REQ: case CPCODES_ID: if (length < 8) break; printf(", Magic-Num=%08x", EXTRACT_32BITS(p)); /* XXX: need to decode Data? */ break; case CPCODES_TIME_REM: if (length < 12) break; printf(", Magic-Num=%08x", EXTRACT_32BITS(p)); printf(" Seconds-Remaining=%u", EXTRACT_32BITS(p + 4)); /* XXX: need to decode Message? */ break; default: printf(", unknown-Codes-0x%02x", code); break; } } /* LCP config options */ static int print_lcp_config_options(const u_char *p, int length) { int len, opt; if (length < 2) return 0; len = p[1]; opt = p[0]; if (length < len) return 0; if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX)) printf(", %s", lcpconfopts[opt]); else { printf(", unknwhown-%d", opt); return len; } switch (opt) { case LCPOPT_VEXT: if (len >= 6) { printf(" OUI=%02x%02x%02x", p[2], p[3], p[4]); #if 0 printf(" kind=%02x", p[5]); printf(" val=") for (i = 0; i < len - 6; i++) { printf("%02x", p[6 + i]); } #endif } break; case LCPOPT_MRU: if (len == 4) printf("=%u", EXTRACT_16BITS(p + 2)); break; case LCPOPT_ACCM: if (len == 6) printf("=%08x", EXTRACT_32BITS(p + 2)); break; case LCPOPT_AP: if (len >= 4) { if (p[2] == 0xc0 && p[3] == 0x23) printf(" PAP"); else if (p[2] == 0xc2 && p[3] == 0x23) { printf(" CHAP/"); switch (p[4]) { default: printf("unknown-algorithm-%u", p[4]); break; case AUTHALG_CHAPMD5: printf("MD5"); break; case AUTHALG_MSCHAP1: printf("MSCHAPv1"); break; case AUTHALG_MSCHAP2: printf("MSCHAPv2"); break; } } else if (p[2] == 0xc2 && p[3] == 0x27) printf(" EAP"); else if (p[2] == 0xc0 && p[3] == 0x27) printf(" SPAP"); else if (p[2] == 0xc1 && p[3] == 0x23) printf(" Old-SPAP"); else printf("unknown"); } break; case LCPOPT_QP: if (len >= 4) { if (p[2] == 0xc0 && p[3] == 0x25) printf(" LQR"); else printf(" unknown"); } break; case LCPOPT_MN: if (len == 6) printf("=%08x", EXTRACT_32BITS(p + 2)); break; case LCPOPT_PFC: break; case LCPOPT_ACFC: break; case LCPOPT_LD: if (len == 4) printf("=%04x", EXTRACT_16BITS(p + 2)); break; case LCPOPT_CBACK: if (len < 3) break; switch (p[2]) { /* Operation */ case CALLBACK_AUTH: printf(" UserAuth"); break; case CALLBACK_DSTR: printf(" DialString"); break; case CALLBACK_LID: printf(" LocalID"); break; case CALLBACK_E164: printf(" E.164"); break; case CALLBACK_X500: printf(" X.500"); break; case CALLBACK_CBCP: printf(" CBCP"); break; default: printf(" unknown-operation=%u", p[2]); break; } break; case LCPOPT_MLMRRU: if (len == 4) printf("=%u", EXTRACT_16BITS(p + 2)); break; case LCPOPT_MLED: if (len < 3) break; switch (p[2]) { /* class */ case MEDCLASS_NULL: printf(" Null"); break; case MEDCLASS_LOCAL: printf(" Local"); /* XXX */ break; case MEDCLASS_IPV4: if (len != 7) break; printf(" IPv4=%s", ipaddr_string(p + 3)); break; case MEDCLASS_MAC: if (len != 9) break; 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 } return len; } /* 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) { printf("[|chap 0x%02x]", *p); return; } code = *p; if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX)) printf("%s", chapcode[code - 1]); else { printf("0x%02x", code); return; } p++; printf("(%u)", *p); /* ID */ p++; 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; val_size = *p; /* value size */ p++; if (length - (p - p0) < val_size) return; printf(", Value="); for (i = 0; i < val_size; i++) printf("%02x", *p++); name_size = len - (p - p0); printf(", Name="); for (i = 0; i < name_size; i++) safeputchar(*p++); break; case CHAP_SUCC: case CHAP_FAIL: msg_size = len - (p - p0); printf(", Msg="); for (i = 0; i< msg_size; i++) safeputchar(*p++); break; } } /* 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) { printf("[|pap 0x%02x]", *p); return; } code = *p; if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX)) printf("%s", papcode[code - 1]); else { printf("0x%02x", code); return; } p++; printf("(%u)", *p); /* ID */ p++; len = EXTRACT_16BITS(p); p += 2; switch (code) { case PAP_AREQ: if (length - (p - p0) < 1) return; peerid_len = *p; /* Peer-ID Length */ p++; if (length - (p - p0) < peerid_len) return; printf(", Peer="); for (i = 0; i < peerid_len; i++) safeputchar(*p++); if (length - (p - p0) < 1) return; passwd_len = *p; /* Password Length */ p++; if (length - (p - p0) < passwd_len) return; printf(", Name="); for (i = 0; i < passwd_len; i++) safeputchar(*p++); break; case PAP_AACK: case PAP_ANAK: if (length - (p - p0) < 1) return; msg_len = *p; /* Msg-Length */ p++; if (length - (p - p0) < msg_len) return; printf(", Msg="); for (i = 0; i< msg_len; i++) safeputchar(*p++); break; } return; } /* BAP */ static void handle_bap(const u_char *p, int length) { /* XXX: to be supported!! */ } /* IPCP config options */ static int print_ipcp_config_options(const u_char *p, int length) { int len, opt; if (length < 2) return 0; len = p[1]; opt = p[0]; if (length < len) return 0; switch (opt) { case IPCPOPT_2ADDR: /* deprecated */ if (len != 10) goto invlen; printf(", IP-Addrs src=%s dst=%s", ipaddr_string(p + 2), ipaddr_string(p + 6)); break; case IPCPOPT_IPCOMP: if (len < 4) goto invlen; printf(", IP-Comp"); if (EXTRACT_16BITS(p + 2) == PPP_VJC) { printf(" VJ-Comp"); /* XXX: VJ-Comp parameters should be decoded */ } else printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2)); break; case IPCPOPT_ADDR: if (len != 6) goto invlen; printf(", IP-Addr=%s", ipaddr_string(p + 2)); break; case IPCPOPT_MOBILE4: if (len != 6) goto invlen; printf(", Home-Addr=%s", ipaddr_string(p + 2)); break; case IPCPOPT_PRIDNS: if (len != 6) goto invlen; printf(", Pri-DNS=%s", ipaddr_string(p + 2)); break; case IPCPOPT_PRINBNS: if (len != 6) goto invlen; printf(", Pri-NBNS=%s", ipaddr_string(p + 2)); break; case IPCPOPT_SECDNS: if (len != 6) goto invlen; printf(", Sec-DNS=%s", ipaddr_string(p + 2)); break; case IPCPOPT_SECNBNS: if (len != 6) goto invlen; printf(", Sec-NBNS=%s", ipaddr_string(p + 2)); break; default: printf(", unknown-%d", opt); break; } return len; invlen: printf(", invalid-length-%d", opt); 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; len = p[1]; opt = p[0]; if (length < len) return 0; if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX)) printf(", %s", ccpconfopts[opt]); #if 0 /* XXX */ switch (opt) { 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: break; default: printf(", unknown-%d", opt); break; } #endif return len; } /* BACP config options */ static int print_bacp_config_options(const u_char *p, int length) { int len, opt; if (length < 2) return 0; len = p[1]; opt = p[0]; if (length < len) return 0; if (opt == BACPOPT_FPEER) { printf(", Favored-Peer"); printf(" Magic-Num=%08x", EXTRACT_32BITS(p + 2)); } else { printf(", unknown-option-%d", opt); } return len; } /* PPP */ static void handle_ppp(u_int proto, const u_char *p, int length) { switch (proto) { case PPP_LCP: case PPP_IPCP: case PPP_CCP: case PPP_BACP: handle_ctrl_proto(proto, 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_IP: ip_print(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, NULL, NULL); break; default: break; } } /* Standard PPP printer */ void ppp_print(register const u_char *p, u_int length) { u_int proto; u_int full_length = length; /* * Here, we assume that p points to the Address and Control * field (if they present). */ if (length < 2) goto trunc; if (*p == PPP_ADDRESS && *(p + 1) == PPP_CONTROL) { p += 2; /* ACFC not used */ length -= 2; } if (length < 2) goto trunc; if (*p % 2) { proto = *p; /* PFC is used */ p++; length--; } else { proto = EXTRACT_16BITS(p); p += 2; length -= 2; } if (eflag) printf("%s %d: ", ppp_protoname(proto), full_length); handle_ppp(proto, p, length); return; trunc: printf("[|ppp]"); } /* PPP I/F printer */ void ppp_if_print(u_char *user, const struct pcap_pkthdr *h, register const u_char *p) { register u_int length = h->len; register u_int caplen = h->caplen; ++infodelay; ts_print(&h->ts); if (caplen < PPP_HDRLEN) { printf("[|ppp]"); goto out; } /* * Some printers want to get back at the link level addresses, * and/or check that they're not walking off the end of the packet. * Rather than pass them all the way down, we set these globals. */ packetp = p; snapend = p + 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); if (xflag) default_print(p, caplen); out: putchar('\n'); --infodelay; if (infoprint) info(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. */ void ppp_hdlc_if_print(u_char *user, 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; ++infodelay; ts_print(&h->ts); if (caplen < 2) { printf("[|ppp]"); goto out; } /* * Some printers want to get back at the link level addresses, * and/or check that they're not walking off the end of the packet. * Rather than pass them all the way down, we set these globals. */ packetp = p; snapend = p + caplen; switch (p[0]) { case PPP_ADDRESS: if (caplen < 4) { printf("[|ppp]"); goto out; } if (eflag) printf("%02x %02x %d ", p[0], p[1], length); p += 2; length -= 2; proto = EXTRACT_16BITS(p); p += 2; length -= 2; if (eflag) printf("%s: ", ppp_protoname(proto)); handle_ppp(proto, p, length); break; case CHDLC_UNICAST: case CHDLC_BCAST: chdlc_print(p, length, caplen); goto out; default: if (eflag) printf("%02x %02x %d ", p[0], p[1], length); p += 2; length -= 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; } if (xflag) default_print(p, caplen); out: putchar('\n'); --infodelay; if (infoprint) info(0); } struct tok ppptype2str[] = { { PPP_IP, "IP" }, { PPP_OSI, "OSI" }, { PPP_NS, "NS" }, { PPP_DECNET, "DECNET" }, { PPP_APPLE, "APPLE" }, { PPP_IPX, "IPX" }, { PPP_VJC, "VJC" }, { PPP_VJNC, "VJNC" }, { PPP_BRPDU, "BRPDU" }, { PPP_STII, "STII" }, { PPP_VINES, "VINES" }, { 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_LCP, "LCP" }, { PPP_PAP, "PAP" }, { PPP_LQM, "LQM" }, { PPP_CHAP, "CHAP" }, { PPP_BACP, "BACP" }, { PPP_BAP, "BAP" }, { PPP_MP, "MP" }, { 0, NULL } }; #define PPP_BSDI_HDRLEN 24 /* BSD/OS specific PPP printer */ void ppp_bsdos_if_print(u_char *user, const struct pcap_pkthdr *h, register const u_char *p) { #ifdef __bsdi__ register u_int length = h->len; register u_int caplen = h->caplen; register int hdrlength; u_int16_t ptype; const u_char *q; int i; ++infodelay; ts_print(&h->ts); if (caplen < PPP_BSDI_HDRLEN) { printf("[|ppp]"); goto out; } /* * Some printers want to get back at the link level addresses, * and/or check that they're not walking off the end of the packet. * Rather than pass them all the way down, we set these globals. */ packetp = p; snapend = p + 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 = ntohs(*(u_int16_t *)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 = ntohs(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, length - (q - p), 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 } goto printx; case PPP_VJNC: ptype = vjc_print(q, length - (q - p), 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 } 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 default: printf("%s ", tok2str(ppptype2str, "proto-#%d", ptype)); } printx: if (xflag) default_print((const u_char *)p, caplen - hdrlength); out: putchar('\n'); --infodelay; if (infoprint) info(0); #endif /* __bsdi__ */ }