767 lines
15 KiB
C
767 lines
15 KiB
C
/*
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* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: print-ppp.c,v 1.26 97/06/12 14:21:29 leres Exp $ (LBL)";
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#if __STDC__
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struct mbuf;
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struct rtentry;
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#endif
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <pcap.h>
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#include <stdio.h>
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#include <net/ethernet.h>
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#include "ethertype.h"
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#include <net/ppp_defs.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "ppp.h"
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struct protonames {
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u_short protocol;
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char *name;
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};
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static struct protonames protonames[] = {
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/*
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* Protocol field values.
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*/
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PPP_IP, "IP", /* Internet Protocol */
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PPP_XNS, "XNS", /* Xerox NS */
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PPP_IPX, "IPX", /* IPX Datagram (RFC1552) */
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PPP_VJC_COMP, "VJC_UNCOMP", /* VJ compressed TCP */
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PPP_VJC_UNCOMP, "VJC_UNCOMP", /* VJ uncompressed TCP */
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PPP_COMP, "COMP", /* compressed packet */
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PPP_IPCP, "IPCP", /* IP Control Protocol */
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PPP_IPXCP, "IPXCP", /* IPX Control Protocol (RFC1552) */
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PPP_CCP, "CCP", /* Compression Control Protocol */
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PPP_LCP, "LCP", /* Link Control Protocol */
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PPP_PAP, "PAP", /* Password Authentication Protocol */
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PPP_LQR, "LQR", /* Link Quality Report protocol */
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PPP_CHAP, "CHAP", /* Cryptographic Handshake Auth. Proto*/
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};
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/* LCP */
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#define LCP_CONF_REQ 1
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#define LCP_CONF_ACK 2
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#define LCP_CONF_NAK 3
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#define LCP_CONF_REJ 4
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#define LCP_TERM_REQ 5
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#define LCP_TERM_ACK 6
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#define LCP_CODE_REJ 7
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#define LCP_PROT_REJ 8
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#define LCP_ECHO_REQ 9
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#define LCP_ECHO_RPL 10
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#define LCP_DISC_REQ 11
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#define LCP_MIN LCP_CONF_REQ
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#define LCP_MAX LCP_DISC_REQ
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static char *lcpcodes[] = {
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/*
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* LCP code values (RFC1661, pp26)
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*/
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"Configure-Request",
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"Configure-Ack",
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"Configure-Nak",
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"Configure-Reject",
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"Terminate-Request",
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"Terminate-Ack",
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"Code-Reject",
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"Protocol-Reject",
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"Echo-Request",
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"Echo-Reply",
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"Discard-Request",
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};
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#define LCPOPT_VEXT 0
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#define LCPOPT_MRU 1
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#define LCPOPT_ACCM 2
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#define LCPOPT_AP 3
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#define LCPOPT_QP 4
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#define LCPOPT_MN 5
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#define LCPOPT_PFC 7
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#define LCPOPT_ACFC 8
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#define LCPOPT_MIN 0
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#define LCPOPT_MAX 24
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static char *lcpconfopts[] = {
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"Vendor-Ext",
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"Max-Rx-Unit",
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"Async-Ctrl-Char-Map",
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"Auth-Prot",
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"Quality-Prot",
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"Magic-Number",
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"unassigned (6)",
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"Prot-Field-Compr",
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"Add-Ctrl-Field-Compr",
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"FCS-Alternatives",
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"Self-Describing-Pad",
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"Numbered-Mode",
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"Multi-Link-Procedure",
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"Call-Back",
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"Connect-Time",
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"Compund-Frames",
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"Nominal-Data-Encap",
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"Multilink-MRRU",
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"Multilink-SSNHF",
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"Multilink-ED",
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"Proprietary",
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"DCE-Identifier",
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"Multilink-Plus-Proc",
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"Link-Discriminator",
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"LCP-Auth-Option",
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};
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/* CHAP */
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#define CHAP_CHAL 1
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#define CHAP_RESP 2
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#define CHAP_SUCC 3
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#define CHAP_FAIL 4
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#define CHAP_CODEMIN 1
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#define CHAP_CODEMAX 4
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static char *chapcode[] = {
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"Challenge",
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"Response",
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"Success",
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"Failure",
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};
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/* PAP */
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#define PAP_AREQ 1
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#define PAP_AACK 2
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#define PAP_ANAK 3
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#define PAP_CODEMIN 1
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#define PAP_CODEMAX 3
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static char *papcode[] = {
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"Authenticate-Request",
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"Authenticate-Ack",
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"Authenticate-Nak",
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};
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/* IPCP */
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#define IPCP_2ADDR 1
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#define IPCP_CP 2
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#define IPCP_ADDR 3
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/* PPPoE */
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struct typenames {
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u_short type;
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char *name;
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};
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static struct typenames typenames[] = {
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/*
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* PPPoE type field values
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*/
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0x00, "DATA", /* PPPoE Data packet */
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0x09, "PADI", /* Active Discovery Initiation */
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0x07, "PADO", /* Active Discovery Offer */
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0x19, "PADR", /* Active Discovery Request */
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0x65, "PADS", /* Active Discovery Session-Confirm */
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0xa7, "PADT", /* Active Discovery Terminate */
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};
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struct tagnames {
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u_short tag;
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char *name;
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int isascii;
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};
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static struct tagnames tagnames[] = {
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/*
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* PPPoE tag field values
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*/
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0x0000, "End-Of-List", 0, /* Optional last tag (len 0) */
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0x0101, "Service-Name", 1, /* The (ascii) service */
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0x0102, "AC-Name", -1, /* Access Concentrator */
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0x0103, "Host-Uniq", 0, /* Associate PAD[OS] with PAD[IR] */
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0x0104, "AC-Cookie", 0, /* Optional at PADO time */
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0x0105, "Vendor-Specific", 0, /* First 4 bytes special (ignore) */
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0x0110, "Relay-Session-Id", 0, /* Max 12 octets, added by gateway */
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0x0201, "Service-Name-Error", -1, /* Request not honoured */
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0x0203, "Generic-Error", 1 /* Access Concentrator error */
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};
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static int handle_lcp(const u_char *p, int length);
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static int print_lcp_config_options(u_char *p);
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static int handle_chap(const u_char *p, int length);
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static int handle_ipcp(const u_char *p, int length);
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static int handle_pap(const u_char *p, int length);
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static void do_ppp_print(const u_char *p, u_int length, u_int caplen);
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/* Standard PPP printer */
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void
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ppp_hdlc_print(const u_char *p, int length)
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{
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int proto = PPP_PROTOCOL(p);
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int i, j, x;
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u_char *ptr;
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printf("ID-%03d ", *(p+5));
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for (i = (sizeof(protonames) / sizeof(protonames[0])) - 1; i >= 0; --i)
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{
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if (proto == protonames[i].protocol)
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{
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printf("%s: ", protonames[i].name);
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switch(proto)
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{
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case PPP_LCP:
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handle_lcp(p, length);
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break;
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case PPP_CHAP:
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handle_chap(p, length);
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break;
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case PPP_PAP:
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handle_pap(p, length);
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break;
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case PPP_IPCP:
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handle_ipcp(p, length);
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break;
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}
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break;
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}
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}
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if (i < 0)
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{
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printf("%04x: ", proto);
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}
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}
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/* print LCP frame */
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static int
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handle_lcp(const u_char *p, int length)
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{
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int x, j;
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u_char *ptr;
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x = *(p+4);
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if((x >= LCP_MIN) && (x <= LCP_MAX))
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{
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printf("%s", lcpcodes[x-1]);
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}
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else
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{
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printf("0x%02x", x);
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return;
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}
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length -= 4;
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switch(x)
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{
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case LCP_CONF_REQ:
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case LCP_CONF_ACK:
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case LCP_CONF_NAK:
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case LCP_CONF_REJ:
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x = length;
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ptr = (u_char *)p+8;
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do
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{
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if((j = print_lcp_config_options(ptr)) == 0)
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break;
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x -= j;
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ptr += j;
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}
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while(x > 0);
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break;
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case LCP_ECHO_REQ:
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case LCP_ECHO_RPL:
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printf(", Magic-Number=%d", ((*(p+8) << 24) + (*(p+9) << 16) + (*(p+10) << 8) + (*(p+11))));
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break;
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case LCP_TERM_REQ:
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case LCP_TERM_ACK:
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case LCP_CODE_REJ:
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case LCP_PROT_REJ:
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case LCP_DISC_REQ:
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default:
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break;
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}
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}
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/* LCP config options */
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static int
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print_lcp_config_options(u_char *p)
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{
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int len = *(p+1);
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int opt = *p;
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if((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
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printf(", %s", lcpconfopts[opt]);
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switch(opt)
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{
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case LCPOPT_MRU:
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if(len == 4)
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printf("=%d", (*(p+2) << 8) + *(p+3));
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break;
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case LCPOPT_AP:
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if(len >= 4)
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{
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if(*(p+2) == 0xc0 && *(p+3) == 0x23)
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{
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printf(" PAP");
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}
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else if(*(p+2) == 0xc2 && *(p+3) == 0x23)
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{
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printf(" CHAP/");
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switch(*(p+4))
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{
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default:
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printf("unknown-algorithm-%d", *(p+4));
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break;
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case 5:
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printf("MD5");
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break;
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case 0x80:
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printf("Microsoft");
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break;
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}
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}
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else if(*(p+2) == 0xc2 && *(p+3) == 0x27)
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{
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printf(" EAP");
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}
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else if(*(p+2) == 0xc0 && *(p+3) == 0x27)
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{
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printf(" SPAP");
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}
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else if(*(p+2) == 0xc1 && *(p+3) == 0x23)
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{
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printf(" Old-SPAP");
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}
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else
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{
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printf("unknown");
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}
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}
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break;
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case LCPOPT_QP:
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if(len >= 4)
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{
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if(*(p+2) == 0xc0 && *(p+3) == 0x25)
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printf(" LQR");
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else
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printf(" unknown");
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}
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break;
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case LCPOPT_MN:
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if(len == 6)
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{
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printf("=%d", ((*(p+2) << 24) + (*(p+3) << 16) + (*(p+4) << 8) + (*(p+5))));
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}
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break;
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case LCPOPT_PFC:
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printf(" PFC");
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break;
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case LCPOPT_ACFC:
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printf(" ACFC");
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break;
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}
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return(len);
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}
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/* CHAP */
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static int
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handle_chap(const u_char *p, int length)
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{
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int x, j;
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u_char *ptr;
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x = *(p+4);
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if((x >= CHAP_CODEMIN) && (x <= CHAP_CODEMAX))
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{
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printf("%s", chapcode[x-1]);
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}
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else
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{
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printf("0x%02x", x);
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return;
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}
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length -= 4;
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switch(x)
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{
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case CHAP_CHAL:
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case CHAP_RESP:
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printf(", Value=");
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x = *(p+8); /* value size */
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ptr = (u_char *)p+9;
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while(--x >= 0)
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printf("%02x", *ptr++);
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x = length - *(p+8) - 1;
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printf(", Name=");
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while(--x >= 0)
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printf("%c", *ptr++);
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break;
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}
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}
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/* PAP */
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static int
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handle_pap(const u_char *p, int length)
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{
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int x, j;
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u_char *ptr;
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x = *(p+4);
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if((x >= PAP_CODEMIN) && (x <= PAP_CODEMAX))
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{
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printf("%s", papcode[x-1]);
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}
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else
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{
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printf("0x%02x", x);
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return;
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}
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length -= 4;
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switch(x)
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{
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case PAP_AREQ:
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printf(", Peer-Id=");
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x = *(p+8); /* peerid size */
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ptr = (u_char *)p+9;
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while(--x >= 0)
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printf("%c", *ptr++);
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x = *ptr++;
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printf(", Passwd=");
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while(--x >= 0)
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printf("%c", *ptr++);
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break;
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case PAP_AACK:
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case PAP_ANAK:
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break;
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}
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}
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/* IPCP */
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static int
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handle_ipcp(const u_char *p, int length)
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{
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int x, j;
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x = *(p+8);
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length -= 4;
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switch(x)
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{
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case IPCP_2ADDR:
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printf("IP-Addresses");
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printf(", Src=%d.%d.%d.%d", *(p+10), *(p+11), *(p+12), *(p+13));
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printf(", Dst=%d.%d.%d.%d", *(p+14), *(p+15), *(p+16), *(p+17));
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break;
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case IPCP_CP:
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printf("IP-Compression-Protocol");
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break;
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case IPCP_ADDR:
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printf("IP-Address=%d.%d.%d.%d", *(p+10), *(p+11), *(p+12), *(p+13));
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break;
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}
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}
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void
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ppp_if_print(u_char *user, const struct pcap_pkthdr *h,
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register const u_char *p)
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{
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register u_int length = h->len;
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register u_int caplen = h->caplen;
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ts_print(&h->ts);
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if (caplen < PPP_HDRLEN) {
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puts("[|ppp]");
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return;
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}
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/*
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* Some printers want to get back at the link level addresses,
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* and/or check that they're not walking off the end of the packet.
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* Rather than pass them all the way down, we set these globals.
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*/
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packetp = p;
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snapend = p + caplen;
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do_ppp_print(p, length, caplen);
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}
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/*
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* Print PPPoE discovery & session packets
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*/
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void
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pppoe_print(const u_char *p, u_int length)
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{
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u_short tag, len, tlen;
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u_char type;
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int f, asc;
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fputs("PPPoE ", stdout);
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/*
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* A PPPoE header:
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*
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | VER | TYPE | CODE | SESSION_ID |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | LENGTH | payload ~
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
|
|
type = p[1];
|
|
for (f = sizeof typenames / sizeof typenames[0] - 1; f >= 0; f--)
|
|
if (typenames[f].type == type) {
|
|
fputs(typenames[f].name, stdout);
|
|
break;
|
|
}
|
|
|
|
if (f == -1) {
|
|
printf("<0x%02x>\n", type);
|
|
}
|
|
|
|
len = ntohs(*(u_short *)(p + 4));
|
|
printf(" v%d, type %d, sess %d len %d", p[0] >> 4, p[0] & 0xf,
|
|
ntohs(*(u_short *)(p + 2)), len);
|
|
|
|
if (type == 0x00) {
|
|
p += 4;
|
|
length -= 4;
|
|
if (len > length)
|
|
len = length; /* puke ! */
|
|
/* This is a data packet */
|
|
fputs("] ", stdout);
|
|
do_ppp_print(p, len, len);
|
|
return;
|
|
}
|
|
|
|
p += 6;
|
|
length -= 6;
|
|
if (len > length)
|
|
len = length; /* puke ! */
|
|
|
|
/*
|
|
* A PPPoE tag:
|
|
*
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | TAG_TYPE | TAG_LENGTH |
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
* | TAG_VALUE ... ~
|
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
*/
|
|
|
|
while (len >= 4) {
|
|
tag = ntohs(*(u_short *)p);
|
|
tlen = ntohs(*(u_short *)(p + 2));
|
|
|
|
fputs(" [", stdout);
|
|
for (f = sizeof tagnames / sizeof tagnames[0] - 1; f >= 0; f--)
|
|
if (tagnames[f].tag == tag) {
|
|
asc = tagnames[f].isascii;
|
|
fputs(tagnames[f].name, stdout);
|
|
break;
|
|
}
|
|
|
|
if (f == -1) {
|
|
printf("<0x%04x>", tag);
|
|
asc = -1;
|
|
}
|
|
|
|
p += 4;
|
|
if (tlen > 0) {
|
|
if (asc == -1) {
|
|
for (f = 0; f < tlen; f++)
|
|
if (!isascii(p[f]))
|
|
break;
|
|
asc = f == tlen;
|
|
}
|
|
fputc(' ', stdout);
|
|
if (asc)
|
|
printf("%.*s", (int)tlen, p);
|
|
else for (f = 0; f < tlen; f++)
|
|
printf("%02x", p[f]);
|
|
}
|
|
fputc(']', stdout);
|
|
|
|
p += tlen;
|
|
len -= tlen + 4;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Actually do the job
|
|
*/
|
|
static void
|
|
do_ppp_print(const u_char *p, u_int length, u_int caplen)
|
|
{
|
|
if (eflag)
|
|
ppp_hdlc_print(p, length);
|
|
|
|
length -= PPP_HDRLEN;
|
|
|
|
switch(PPP_PROTOCOL(p)) {
|
|
case PPP_IP:
|
|
case ETHERTYPE_IP:
|
|
ip_print((const u_char *)(p + PPP_HDRLEN), length);
|
|
break;
|
|
case PPP_IPX:
|
|
case ETHERTYPE_IPX:
|
|
ipx_print((const u_char *)(p + PPP_HDRLEN), length);
|
|
break;
|
|
|
|
default:
|
|
if(!eflag)
|
|
ppp_hdlc_print(p, length);
|
|
if(!xflag)
|
|
default_print((const u_char *)(p + PPP_HDRLEN),
|
|
caplen - PPP_HDRLEN);
|
|
}
|
|
|
|
if (xflag)
|
|
default_print((const u_char *)(p + PPP_HDRLEN),
|
|
caplen - PPP_HDRLEN);
|
|
out:
|
|
putchar('\n');
|
|
}
|
|
|
|
/* proto type to string mapping */
|
|
static struct tok ptype2str[] = {
|
|
{ PPP_VJC, "VJC" },
|
|
{ PPP_VJNC, "VJNC" },
|
|
{ PPP_OSI, "OSI" },
|
|
{ PPP_LCP, "LCP" },
|
|
{ PPP_IPCP, "IPCP" },
|
|
{ 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)
|
|
{
|
|
register u_int length = h->len;
|
|
register u_int caplen = h->caplen;
|
|
register int hdrlength;
|
|
u_short ptype;
|
|
|
|
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 (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_short *)p);
|
|
if (eflag)
|
|
printf("%04x ", ptype);
|
|
p += 2;
|
|
hdrlength += 2;
|
|
}
|
|
|
|
length -= hdrlength;
|
|
|
|
if (ptype == PPP_IP)
|
|
ip_print(p, length);
|
|
else
|
|
printf("%s ", tok2str(ptype2str, "proto-#%d", ptype));
|
|
|
|
if (xflag)
|
|
default_print((const u_char *)p, caplen - hdrlength);
|
|
out:
|
|
putchar('\n');
|
|
}
|