/*
 * proto.c
 *
 * Written by Archie Cobbs <archie@freebsd.org>
 * Copyright (c) 1995-1999 Whistle Communications, Inc. All rights reserved.
 * See ``COPYRIGHT.whistle''
 */

#include "ppp.h"

/*
 * DEFINITIONS
 */

  /* Protocol number <-> name mapping */
  struct protoname {
    u_short	proto;
    const char	*name;
  };

/*
 * INTERNAL VARIABLES
 */

  /* These are protocols we use and keep stats on */
  static const struct protoname statProtos[] = {
    { 0,		"Unknown" },
    { PROTO_IP,		"IP" },
    { PROTO_VJUNCOMP,	"VJUNCOMP" },
    { PROTO_VJCOMP,	"VJCOMP" },
    { PROTO_MP,		"MP" },
    { PROTO_IPCP,	"IPCP" },
    { PROTO_ICOMPD,	"ICOMPD" },
    { PROTO_COMPD,	"COMPD" },
    { PROTO_ICCP,	"ICCP" },
    { PROTO_CCP,	"CCP" },
    { PROTO_LCP,	"LCP" },
    { PROTO_PAP,	"PAP" },
    { PROTO_LQR,	"LQR" },
    { PROTO_CHAP,	"CHAP" },
    { PROTO_ICRYPT,	"ICRYPT" },
    { PROTO_CRYPT,	"CRYPT" },
    { PROTO_IECP,	"IECP" },
    { PROTO_ECP,	"ECP" },
    { PROTO_SPAP,	"SPAP" },
    { PROTO_ATCP,	"ATCP" },
  };
  #define NUM_STAT_PROTOCOLS	(sizeof(statProtos) / sizeof(*statProtos))

/*
 * These are other protocols we recognize but don't use
 * Reference: ftp://ftp.isi.edu/in-notes/iana/assignments/ppp-numbers
 */

  static const struct protoname protoNames[] = {
#ifdef PROTO_NAME_LIST
    { 0x0001,	"Padding Protocol" },
    { 0x0021,	"Internet Protocol" },
    { 0x0023,	"OSI Network Layer" },
    { 0x0025,	"Xerox NS IDP" },
    { 0x0027,	"DECnet Phase IV" },
    { 0x0029,	"Appletalk" },
    { 0x002b,	"Novell IPX" },
    { 0x002d,	"Van Jacobson Compressed TCP/IP" },
    { 0x002f,	"Van Jacobson Uncompressed TCP/IP" },
    { 0x0031,	"Bridging PDU" },
    { 0x0033,	"Stream Protocol (ST-II)" },
    { 0x0035,	"Banyan Vines" },
    { 0x0037,	"reserved (until 1993)" },
    { 0x0039,	"AppleTalk EDDP" },
    { 0x003b,	"AppleTalk SmartBuffered" },
    { 0x003d,	"Multi-Link" },
    { 0x003f,	"NETBIOS Framing" },
    { 0x0041,	"Cisco Systems" },
    { 0x0043,	"Ascom Timeplex" },
    { 0x0045,	"Fujitsu Link Backup and Load Balancing (LBLB)" },
    { 0x0047,	"DCA Remote Lan" },
    { 0x0049,	"Serial Data Transport Protocol (PPP-SDTP)" },
    { 0x004b,	"SNA over 802.2" },
    { 0x004d,	"SNA" },
    { 0x004f,	"IP6 Header Compression" },
    { 0x0057,	"IPv6 over PPP" },
    { 0x006f,	"Stampede Bridging" },
    { 0x007d,	"reserved", },
    { 0x007f,	"reserved", },
    { 0x00cf,	"reserved (PPP NLPID)" },
    { 0x00fb,	"compression on single link in multilink group" },
    { 0x00fd,	"1st choice compression" },
    { 0x00ff,	"reserved" },

    { 0x0201,	"802.1d Hello Packets" },
    { 0x0203,	"IBM Source Routing BPDU" },
    { 0x0205,	"DEC LANBridge100 Spanning Tree" },
    { 0x0231,	"Luxcom" },
    { 0x0233,	"Sigma Network Systems" },

    { 0x8021,	"Internet Protocol Control Protocol" },
    { 0x8023,	"OSI Network Layer Control Protocol" },
    { 0x8025,	"Xerox NS IDP Control Protocol" },
    { 0x8027,	"DECnet Phase IV Control Protocol" },
    { 0x8029,	"Appletalk Control Protocol" },
    { 0x802b,	"Novell IPX Control Protocol" },
    { 0x802d,	"reserved" },
    { 0x802f,	"reserved" },
    { 0x8031,	"Bridging NCP" },
    { 0x8033,	"Stream Protocol Control Protocol" },
    { 0x8035,	"Banyan Vines Control Protocol" },
    { 0x8037,	"reserved till 1993" },
    { 0x8039,	"reserved" },
    { 0x803b,	"reserved" },
    { 0x803d,	"Multi-Link Control Protocol" },
    { 0x803f,	"NETBIOS Framing Control Protocol" },
    { 0x807d,	"reserved" },
    { 0x8041,	"Cisco Systems Control Protocol" },
    { 0x8043,	"Ascom Timeplex" },
    { 0x8045,	"Fujitsu LBLB Control Protocol" },
    { 0x8047,	"DCA Remote Lan Network Control Protocol (RLNCP)" },
    { 0x8049,	"Serial Data Control Protocol (PPP-SDCP)" },
    { 0x804b,	"SNA over 802.2 Control Protocol" },
    { 0x804d,	"SNA Control Protocol" },
    { 0x804f,	"IP6 Header Compression Control Protocol" },
    { 0x8057,	"IPv6 PPP Control Protocol" },
    { 0x806f,	"Stampede Bridging Control Protocol" },
    { 0x80cf,	"Not Used - reserved,	" },
    { 0x80fb,	"compression on single link in multilink group control" },
    { 0x80fd,	"Compression Control Protocol" },
    { 0x80ff,	"reserved" },

    { 0xc021,	"Link Control Protocol" },
    { 0xc023,	"Password Authentication Protocol" },
    { 0xc025,	"Link Quality Report" },
    { 0xc027,	"Shiva Password Authentication Protocol" },
    { 0xc029,	"CallBack Control Protocol (CBCP)" },
    { 0xc081,	"Container Control Protocol", },
    { 0xc223,	"Challenge Handshake Authentication Protocol" },
    { 0xc281,	"Proprietary Authentication Protocol", },
    { 0xc26f,	"Stampede Bridging Authorization Protocol" },
    { 0xc481,	"Proprietary Node ID Authentication Protocol", },
#endif
  };
  #define NUM_PROTO_NAMES	(sizeof(protoNames) / sizeof(*protoNames))

/*
 * INTERNAL FUNCTIONS
 */

  static int	ProtoNameCmp(const void *v1, const void *v2);

/*
 * ProtoName()
 */

const char *
ProtoName(int proto)
{
  int			k;
  static char		buf[20];
  struct protoname	key, *pn;

  /* First check our stat list for known short names */
  for (k = 0; k < NUM_STAT_PROTOCOLS; k++) {
    if (proto == statProtos[k].proto)
      return(statProtos[k].name);
  }

  /* Now look in list of all defined protocols */
  key.proto = proto;
  if ((pn = bsearch(&key, protoNames,
      NUM_PROTO_NAMES, sizeof(*pn), ProtoNameCmp)) != NULL)
    return(pn->name);

  /* Return hex value */
  sprintf(buf, "0x%04x", proto);
  return(buf);
}

/*
 * ProtoNameCmp()
 */

static int
ProtoNameCmp(const void *v1, const void *v2)
{
  struct protoname	*const p1 = (struct protoname *) v1;
  struct protoname	*const p2 = (struct protoname *) v2;

  return(p1->proto - p2->proto);
}