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/* David Leonard, 2002. Public domain. */
/* $Id: ppp.c 1172 2006-11-11 13:32:14Z d $ */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#if HAVE_PCAP_H
# include <pcap.h>
#endif
#if HAVE_NET_PPP_DEFS_H
# include <net/ppp_defs.h>
#endif
/* Solaris */
#if HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#if HAVE_NETINET_IN_SYSTM_H
# include <netinet/in_systm.h>
#endif
#if HAVE_NETINET_IP_H
# include <netinet/ip.h>
#endif
#if HAVE_SYS_PPP_SYS_H
# include <sys/stream.h>
# include <sys/vjcomp.h>
# include <sys/ppp_ioctl.h>
# include <sys/ppp_sys.h>
#endif
#include "compat.h"
#include "tag.h"
#include "flow.h"
#ifndef PPP_IP
# define PPP_IP 0x21 /* Internet Protocol */
# define PPP_IPV6 0x57 /* Internet Protocol Version 6 */
# define PPP_IPX 0x2b /* Internetwork Packet Exchange */
# define PPP_AT 0x29 /* AppleTalk Protocol */
# define PPP_IPCP 0x8021 /* IP Control Protocol */
# define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
# define PPP_CCP 0x80fd /* Compression Control Protocol */
# define PPP_LCP 0xc021 /* Link Control Protocol */
# define PPP_PAP 0xc023 /* Password Authentication Protocol */
# define PPP_LQR 0xc025 /* Link Quality Report protocol */
# define PPP_CHAP 0xc223 /* Cryptographic Handshake Auth. Protocol */
# define PPP_COMP 0xfd /* compressed packet */
#endif
#ifndef PPP_HDRLEN
# define PPP_HDRLEN 4
#endif
#ifndef PPP_PROTOCOL
# define PPP_PROTOCOL(p) ((((u_char *)(p))[2] << 8) + ((u_char *)(p))[3])
#endif
/* When the datalink type is DLT_PPP, we decode PPP-level packets */
const char *
ppp_tag(const char *p, const char *end)
{
static char tag[TAGLEN];
switch (PPP_PROTOCOL(p)) {
/* higher level protocol encapsulation */
case PPP_IP:
return ip_tag(p + PPP_HDRLEN, end);
#if HAVE_NETINET_IP6_H
case PPP_IPV6:
return ip6_tag(p + PPP_HDRLEN, end);
#endif
case PPP_IPX:
return "ipx"; /* XXX - could decode further? */
case PPP_AT:
return "appletalk"; /* XXX - could decode further? */
/* ppp private protocols */
case PPP_IPCP:
return "ppp-ipcp (IP negotiation)";
case PPP_IPV6CP:
return "ppp-ipv6cp (IPv6 negotiation)";
case PPP_CCP:
return "ppp-ccp (compression control)";
case PPP_LCP:
return "ppp-lcp (link control)";
case PPP_PAP:
return "ppp-pap (authentication)";
case PPP_LQR:
return "ppp-lqr (link quality)";
case PPP_CHAP:
return "ppp-chap (authentication)";
case PPP_COMP:
return "ppp-comp (comp/decompression fault)";
default:
snprintf(tag, sizeof tag, "ppp-0x%04x", PPP_PROTOCOL(p));
return tag;
}
}
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