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tcpdump/print-ppp.c

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/*
* 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[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.65 2001-10-24 03:49:19 itojun Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#ifdef __bsdi__
#include <net/slcompress.h>
#include <net/if_ppp.h>
#endif
#include <netinet/in.h>
#include <ctype.h>
#include <netdb.h>
#include <pcap.h>
#include <stdio.h>
#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;
}
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;
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__ */
}
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