mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-27 03:53:53 +08:00
654 lines
12 KiB
C
654 lines
12 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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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.29 1999-11-17 05:18:27 assar 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 <netinet/if_ether.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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#ifdef __bsdi__
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#include <net/slcompress.h>
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#include <net/if_ppp.h>
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#endif
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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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/* XXX This goes somewhere else. */
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#define PPP_HDRLEN 4
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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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static const char *ppp_protoname __P((int proto));
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static void handle_lcp __P((const u_char *p, int length));
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static int print_lcp_config_options __P((const u_char *p));
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static void handle_chap __P((const u_char *p, int length));
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static void handle_ipcp __P((const u_char *p, int length));
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static void handle_pap __P((const u_char *p, int length));
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static const char *
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ppp_protoname(int proto)
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{
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static char buf[20];
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switch (proto) {
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case PPP_IP: return "IP";
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#ifdef PPP_XNS
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case PPP_XNS: return "XNS";
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#endif
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#ifdef PPP_IPX
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case PPP_IPX: return "IPX";
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#endif
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#ifdef PPP_COMP
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case PPP_COMP: return "COMP";
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#endif
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#ifdef PPP_IPCP
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case PPP_IPCP: return "IPCP";
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#endif
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#ifdef PPP_IPV6CP
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case PPP_IPV6CP: return "IPV6CP";
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#endif
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#ifdef PPP_IPXCP
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case PPP_IPXCP: return "IPXCP";
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#endif
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#ifdef PPP_CCP
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case PPP_CCP: return "CCP";
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#endif
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#ifdef PPP_LCP
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case PPP_LCP: return "LCP";
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#endif
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#ifdef PPP_PAP
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case PPP_PAP: return "PAP";
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#endif
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#ifdef PPP_LQR
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case PPP_LQR: return "LQR";
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#endif
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#ifdef PPP_CHAP
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case PPP_CHAP: return "CHAP";
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#endif
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default:
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sprintf(buf, "unknown-0x%04x\n", proto);
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return buf;
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}
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}
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/* print LCP frame */
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static void
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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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const 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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printf("%s", lcpcodes[x - 1]);
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else {
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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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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 = p + 8;
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do {
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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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} 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=%u",
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(u_int32_t)ntohl(*(u_int32_t *)(p + 8)));
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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(const u_char *p)
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{
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int len = p[1];
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int opt = p[0];
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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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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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if (p[2] == 0xc0 && p[3] == 0x23)
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printf(" PAP");
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else if (p[2] == 0xc2 && p[3] == 0x23) {
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printf(" CHAP/");
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switch (p[4]) {
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default:
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printf("unknown-algorithm-%u", 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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printf(" EAP");
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else if (p[2] == 0xc0 && p[3] == 0x27)
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printf(" SPAP");
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else if (p[2] == 0xc1 && p[3] == 0x23)
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printf(" Old-SPAP");
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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_QP:
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if (len >= 4) {
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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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printf("=%u", (u_int32_t)ntohl(*(u_int32_t *)(p + 2)));
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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 void
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handle_chap(const u_char *p, int length)
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{
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int x;
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const u_char *ptr;
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if ((x >= CHAP_CODEMIN) && (x <= CHAP_CODEMAX))
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printf("%s", chapcode[x - 1]);
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else {
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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 (p[4]) {
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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 = 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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if (isprint(*ptr))
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printf("%c", *ptr);
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else
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printf("\\%03o", *ptr);
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ptr++;
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}
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break;
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}
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}
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/* PAP */
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static void
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handle_pap(const u_char *p, int length)
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{
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int x;
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const 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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printf("%s", papcode[x - 1]);
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else {
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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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case PAP_AREQ:
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printf(", Peer-Id=");
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x = p[8]; /* peerid size */
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ptr = p + 9;
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while (--x >= 0) {
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if (isprint(*ptr))
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printf("%c", *ptr);
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else
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printf("\\%03o", *ptr);
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ptr++;
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}
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x = *ptr++;
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printf(", Passwd=");
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while (--x >= 0) {
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if (isprint(*ptr))
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printf("%c", *ptr);
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else
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printf("\\%03o", *ptr);
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ptr++;
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}
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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 void
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handle_ipcp(const u_char *p, int length)
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{
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length -= 4;
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switch (p[8]) {
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case IPCP_2ADDR:
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printf("IP-Addresses");
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printf(", src=%s", ipaddr_string(p + 10));
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printf(", drc=%s", ipaddr_string(p + 14));
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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=%s", ipaddr_string(p + 10));
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break;
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}
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}
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/* Standard PPP printer */
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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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const struct ip *ip;
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u_int proto;
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ts_print(&h->ts);
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if (caplen < PPP_HDRLEN) {
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printf("[|ppp]");
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goto out;
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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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proto = ntohs(*(u_short *)&p[2]);
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packetp = p;
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snapend = p + caplen;
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if (eflag)
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printf("%c %4d %02x %s: ", p[0] ? 'O' : 'I', length,
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p[1], ppp_protoname(proto));
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length -= PPP_HDRLEN;
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ip = (struct ip *)(p + PPP_HDRLEN);
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switch (proto) {
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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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case ETHERTYPE_IP: /*XXX*/
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case PPP_IP:
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ip_print((const u_char *)ip, length);
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break;
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#ifdef INET6
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case ETHERTYPE_IPV6: /*XXX*/
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#ifdef PPP_IPV6
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case PPP_IPV6:
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#endif
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ip6_print((const u_char *)ip, length);
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break;
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#endif
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}
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if (xflag)
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default_print((const u_char *)ip, caplen - PPP_HDRLEN);
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out:
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putchar('\n');
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}
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#ifdef __bsdi__
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/* proto type to string mapping */
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static struct tok ptype2str[] = {
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{ PPP_VJC, "VJC" },
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{ PPP_VJNC, "VJNC" },
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{ PPP_OSI, "OSI" },
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{ PPP_LCP, "LCP" },
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{ PPP_IPCP, "IPCP" },
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{ 0, NULL }
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};
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#endif
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#define PPP_BSDI_HDRLEN 24
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/* BSD/OS specific PPP printer */
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void
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ppp_bsdos_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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#ifdef __bsdi__
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register u_int length = h->len;
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register u_int caplen = h->caplen;
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register int hdrlength;
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u_short ptype;
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const u_char *q;
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int i;
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ts_print(&h->ts);
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if (caplen < PPP_BSDI_HDRLEN) {
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printf("[|ppp]");
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goto out;
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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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hdrlength = 0;
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#if 0
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if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
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if (eflag)
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printf("%02x %02x ", p[0], p[1]);
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p += 2;
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hdrlength = 2;
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}
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if (eflag)
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printf("%d ", length);
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/* Retrieve the protocol type */
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if (*p & 01) {
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/* Compressed protocol field */
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ptype = *p;
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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;
|
|
}
|
|
#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(ptype2str,
|
|
"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;
|
|
if (ptype == PPP_IP)
|
|
ip_print(p, length);
|
|
goto printx;
|
|
case PPP_VJNC:
|
|
ptype = vjc_print(q, length - (q - p), ptype);
|
|
hdrlength = PPP_BSDI_HDRLEN;
|
|
p += hdrlength;
|
|
if (ptype == PPP_IP)
|
|
ip_print(p, length);
|
|
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;
|
|
|
|
if (ptype == PPP_IP)
|
|
ip_print(p, length);
|
|
else
|
|
printf("%s ", tok2str(ptype2str, "proto-#%d", ptype));
|
|
|
|
printx:
|
|
if (xflag)
|
|
default_print((const u_char *)p, caplen - hdrlength);
|
|
out:
|
|
putchar('\n');
|
|
#endif /* __bsdi__ */
|
|
}
|