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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.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-ppp.c,v 1.31 1999-11-21 09:36:59 fenner Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#if __STDC__
struct mbuf;
struct rtentry;
#endif
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#include <ctype.h>
#include <netdb.h>
#include <pcap.h>
#include <stdio.h>
#ifdef __bsdi__
#include <net/slcompress.h>
#include <net/if_ppp.h>
#endif
#include "interface.h"
#include "addrtoname.h"
#include "ppp.h"
/* XXX This goes somewhere else. */
#define PPP_HDRLEN 4
/* LCP */
#define LCP_CONF_REQ 1
#define LCP_CONF_ACK 2
#define LCP_CONF_NAK 3
#define LCP_CONF_REJ 4
#define LCP_TERM_REQ 5
#define LCP_TERM_ACK 6
#define LCP_CODE_REJ 7
#define LCP_PROT_REJ 8
#define LCP_ECHO_REQ 9
#define LCP_ECHO_RPL 10
#define LCP_DISC_REQ 11
#define LCP_MIN LCP_CONF_REQ
#define LCP_MAX LCP_DISC_REQ
static char *lcpcodes[] = {
/*
* LCP code values (RFC1661, pp26)
*/
"Configure-Request",
"Configure-Ack",
"Configure-Nak",
"Configure-Reject",
"Terminate-Request",
"Terminate-Ack",
"Code-Reject",
"Protocol-Reject",
"Echo-Request",
"Echo-Reply",
"Discard-Request",
};
#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_PFC 7
#define LCPOPT_ACFC 8
#define LCPOPT_MIN 0
#define LCPOPT_MAX 24
static char *lcpconfopts[] = {
"Vendor-Ext",
"Max-Rx-Unit",
"Async-Ctrl-Char-Map",
"Auth-Prot",
"Quality-Prot",
"Magic-Number",
"unassigned (6)",
"Prot-Field-Compr",
"Add-Ctrl-Field-Compr",
"FCS-Alternatives",
"Self-Describing-Pad",
"Numbered-Mode",
"Multi-Link-Procedure",
"Call-Back",
"Connect-Time"
"Compund-Frames",
"Nominal-Data-Encap",
"Multilink-MRRU",
"Multilink-SSNHF",
"Multilink-ED",
"Proprietary",
"DCE-Identifier",
"Multilink-Plus-Proc",
"Link-Discriminator",
"LCP-Auth-Option",
};
/* CHAP */
#define CHAP_CHAL 1
#define CHAP_RESP 2
#define CHAP_SUCC 3
#define CHAP_FAIL 4
#define CHAP_CODEMIN 1
#define CHAP_CODEMAX 4
static char *chapcode[] = {
"Challenge",
"Response",
"Success",
"Failure",
};
/* PAP */
#define PAP_AREQ 1
#define PAP_AACK 2
#define PAP_ANAK 3
#define PAP_CODEMIN 1
#define PAP_CODEMAX 3
static char *papcode[] = {
"Authenticate-Request",
"Authenticate-Ack",
"Authenticate-Nak",
};
/* IPCP */
#define IPCP_2ADDR 1
#define IPCP_CP 2
#define IPCP_ADDR 3
static const char *ppp_protoname __P((int proto));
static void handle_lcp __P((const u_char *p, int length));
static int print_lcp_config_options __P((const u_char *p));
static void handle_chap __P((const u_char *p, int length));
static void handle_ipcp __P((const u_char *p, int length));
static void handle_pap __P((const u_char *p, int length));
static const char *
ppp_protoname(int proto)
{
static char buf[20];
switch (proto) {
case PPP_IP: return "IP";
#ifdef PPP_XNS
case PPP_XNS: return "XNS";
#endif
#ifdef PPP_IPX
case PPP_IPX: return "IPX";
#endif
#ifdef PPP_COMP
case PPP_COMP: return "COMP";
#endif
#ifdef PPP_IPCP
case PPP_IPCP: return "IPCP";
#endif
#ifdef PPP_IPV6CP
case PPP_IPV6CP: return "IPV6CP";
#endif
#ifdef PPP_IPXCP
case PPP_IPXCP: return "IPXCP";
#endif
#ifdef PPP_CCP
case PPP_CCP: return "CCP";
#endif
#ifdef PPP_LCP
case PPP_LCP: return "LCP";
#endif
#ifdef PPP_PAP
case PPP_PAP: return "PAP";
#endif
#ifdef PPP_LQR
case PPP_LQR: return "LQR";
#endif
#ifdef PPP_CHAP
case PPP_CHAP: return "CHAP";
#endif
default:
sprintf(buf, "unknown-0x%04x\n", proto);
return buf;
}
}
/* print LCP frame */
static void
handle_lcp(const u_char *p, int length)
{
int x, j;
const u_char *ptr;
x = p[4];
if ((x >= LCP_MIN) && (x <= LCP_MAX))
printf("%s", lcpcodes[x - 1]);
else {
printf("0x%02x", x);
return;
}
length -= 4;
switch (x) {
case LCP_CONF_REQ:
case LCP_CONF_ACK:
case LCP_CONF_NAK:
case LCP_CONF_REJ:
x = length;
ptr = p + 8;
do {
if ((j = print_lcp_config_options(ptr)) == 0)
break;
x -= j;
ptr += j;
} while (x > 0);
break;
case LCP_ECHO_REQ:
case LCP_ECHO_RPL:
printf(", Magic-Number=%u",
(u_int32_t)ntohl(*(u_int32_t *)(p + 8)));
break;
case LCP_TERM_REQ:
case LCP_TERM_ACK:
case LCP_CODE_REJ:
case LCP_PROT_REJ:
case LCP_DISC_REQ:
default:
break;
}
}
/* LCP config options */
static int
print_lcp_config_options(const u_char *p)
{
int len = p[1];
int opt = p[0];
if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
printf(", %s", lcpconfopts[opt]);
switch (opt) {
case LCPOPT_MRU:
if (len == 4)
printf("=%d", (*(p+2) << 8) + *(p+3));
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 5:
printf("MD5");
break;
case 0x80:
printf("Microsoft");
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("=%u", (u_int32_t)ntohl(*(u_int32_t *)(p + 2)));
break;
case LCPOPT_PFC:
printf(" PFC");
break;
case LCPOPT_ACFC:
printf(" ACFC");
break;
}
return len;
}
/* CHAP */
static void
handle_chap(const u_char *p, int length)
{
int x;
const u_char *ptr;
if ((x >= CHAP_CODEMIN) && (x <= CHAP_CODEMAX))
printf("%s", chapcode[x - 1]);
else {
printf("0x%02x", x);
return;
}
length -= 4;
switch (p[4]) {
case CHAP_CHAL:
case CHAP_RESP:
printf(", Value=");
x = p[8]; /* value size */
ptr = p + 9;
while (--x >= 0)
printf("%02x", *ptr++);
x = length - p[8] - 1;
printf(", Name=");
while (--x >= 0) {
if (isprint(*ptr))
printf("%c", *ptr);
else
printf("\\%03o", *ptr);
ptr++;
}
break;
}
}
/* PAP */
static void
handle_pap(const u_char *p, int length)
{
int x;
const u_char *ptr;
x = p[4];
if ((x >= PAP_CODEMIN) && (x <= PAP_CODEMAX))
printf("%s", papcode[x - 1]);
else {
printf("0x%02x", x);
return;
}
length -= 4;
switch (x) {
case PAP_AREQ:
printf(", Peer-Id=");
x = p[8]; /* peerid size */
ptr = p + 9;
while (--x >= 0) {
if (isprint(*ptr))
printf("%c", *ptr);
else
printf("\\%03o", *ptr);
ptr++;
}
x = *ptr++;
printf(", Passwd=");
while (--x >= 0) {
if (isprint(*ptr))
printf("%c", *ptr);
else
printf("\\%03o", *ptr);
ptr++;
}
break;
case PAP_AACK:
case PAP_ANAK:
break;
}
}
/* IPCP */
static void
handle_ipcp(const u_char *p, int length)
{
length -= 4;
switch (p[8]) {
case IPCP_2ADDR:
printf("IP-Addresses");
printf(", src=%s", ipaddr_string(p + 10));
printf(", drc=%s", ipaddr_string(p + 14));
break;
case IPCP_CP:
printf("IP-Compression-Protocol");
break;
case IPCP_ADDR:
printf("IP-Address=%s", ipaddr_string(p + 10));
break;
}
}
/* Standard PPP 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;
const struct ip *ip;
u_int proto;
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.
*/
proto = ntohs(*(u_short *)&p[2]);
packetp = p;
snapend = p + caplen;
if (eflag)
printf("%c %4d %02x %s: ", p[0] ? 'O' : 'I', length,
p[1], ppp_protoname(proto));
length -= PPP_HDRLEN;
ip = (struct ip *)(p + PPP_HDRLEN);
switch (proto) {
case PPP_LCP:
handle_lcp (p, length);
break;
case PPP_CHAP:
handle_chap(p, length);
break;
case PPP_PAP:
handle_pap(p, length);
break;
case PPP_IPCP:
handle_ipcp(p, length);
break;
case ETHERTYPE_IP: /*XXX*/
case PPP_IP:
ip_print((const u_char *)ip, length);
break;
#ifdef INET6
case ETHERTYPE_IPV6: /*XXX*/
#ifdef PPP_IPV6
case PPP_IPV6:
#endif
ip6_print((const u_char *)ip, length);
break;
#endif
}
if (xflag)
default_print((const u_char *)ip, caplen - PPP_HDRLEN);
out:
putchar('\n');
}
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" },
{ 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_short ptype;
const u_char *q;
int i;
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_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(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;
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(ppptype2str, "proto-#%d", ptype));
printx:
if (xflag)
default_print((const u_char *)p, caplen - hdrlength);
out:
putchar('\n');
#endif /* __bsdi__ */
}
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