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ipxcp.c

/*
 * ipxcp.c - PPP IPX Control Protocol.
 *
 * Copyright (c) 1989 Carnegie Mellon University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by Carnegie Mellon University.  The name of the
 * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifdef IPX_CHANGE
#ifndef lint
static char rcsid[] = "$FreeBSD: src/usr.sbin/pppd/ipxcp.c,v 1.6.30.1 2008/11/25 02:59:29 kensmith Exp $";
#endif

/*
 * TODO:
 */

#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include "pppd.h"
#include "fsm.h"
#include "ipxcp.h"
#include "pathnames.h"

/* global vars */
ipxcp_options ipxcp_wantoptions[NUM_PPP]; /* Options that we want to request */
ipxcp_options ipxcp_gotoptions[NUM_PPP];  /* Options that peer ack'd */
ipxcp_options ipxcp_allowoptions[NUM_PPP];      /* Options we allow peer to request */
ipxcp_options ipxcp_hisoptions[NUM_PPP];  /* Options that we ack'd */

#define wo (&ipxcp_wantoptions[0])
#define ao (&ipxcp_allowoptions[0])
#define go (&ipxcp_gotoptions[0])
#define ho (&ipxcp_hisoptions[0])

/*
 * Callbacks for fsm code.  (CI = Configuration Information)
 */
static void ipxcp_resetci __P((fsm *));   /* Reset our CI */
static int  ipxcp_cilen __P((fsm *));           /* Return length of our CI */
static void ipxcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
static int  ipxcp_ackci __P((fsm *, u_char *, int));  /* Peer ack'd our CI */
static int  ipxcp_nakci __P((fsm *, u_char *, int));  /* Peer nak'd our CI */
static int  ipxcp_rejci __P((fsm *, u_char *, int));  /* Peer rej'd our CI */
static int  ipxcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
static void ipxcp_up __P((fsm *));        /* We're UP */
static void ipxcp_down __P((fsm *));            /* We're DOWN */
static void ipxcp_script __P((fsm *, char *)); /* Run an up/down script */

fsm ipxcp_fsm[NUM_PPP];       /* IPXCP fsm structure */

static fsm_callbacks ipxcp_callbacks = { /* IPXCP callback routines */
    ipxcp_resetci,            /* Reset our Configuration Information */
    ipxcp_cilen,        /* Length of our Configuration Information */
    ipxcp_addci,        /* Add our Configuration Information */
    ipxcp_ackci,        /* ACK our Configuration Information */
    ipxcp_nakci,        /* NAK our Configuration Information */
    ipxcp_rejci,        /* Reject our Configuration Information */
    ipxcp_reqci,        /* Request peer's Configuration Information */
    ipxcp_up,                 /* Called when fsm reaches OPENED state */
    ipxcp_down,               /* Called when fsm leaves OPENED state */
    NULL,               /* Called when we want the lower layer up */
    NULL,               /* Called when we want the lower layer down */
    NULL,               /* Called when Protocol-Reject received */
    NULL,               /* Retransmission is necessary */
    NULL,               /* Called to handle protocol-specific codes */
    "IPXCP"             /* String name of protocol */
};

/*
 * Protocol entry points.
 */

static void ipxcp_init __P((int));
static void ipxcp_open __P((int));
static void ipxcp_close __P((int, char *));
static void ipxcp_lowerup __P((int));
static void ipxcp_lowerdown __P((int));
static void ipxcp_input __P((int, u_char *, int));
static void ipxcp_protrej __P((int));
static int  ipxcp_printpkt __P((u_char *, int,
                        void (*) __P((void *, char *, ...)), void *));

struct protent ipxcp_protent = {
    PPP_IPXCP,
    ipxcp_init,
    ipxcp_input,
    ipxcp_protrej,
    ipxcp_lowerup,
    ipxcp_lowerdown,
    ipxcp_open,
    ipxcp_close,
    ipxcp_printpkt,
    NULL,
    0,
    "IPXCP",
    NULL,
    NULL,
    NULL
};

/*
 * Lengths of configuration options.
 */

#define CILEN_VOID      2
#define CILEN_COMPLETE  2     /* length of complete option */
#define CILEN_NETN      6     /* network number length option */
#define CILEN_NODEN     8     /* node number length option */
#define CILEN_PROTOCOL  4     /* Minimum length of routing protocol */
#define CILEN_NAME      3     /* Minimum length of router name */
#define CILEN_COMPRESS  4     /* Minimum length of compression protocol */

#define CODENAME(x)     ((x) == CONFACK ? "ACK" : \
                   (x) == CONFNAK ? "NAK" : "REJ")

/* Used in printing the node number */
#define NODE(base) base[0], base[1], base[2], base[3], base[4], base[5]

/* Used to generate the proper bit mask */
#define BIT(num)   (1 << (num))

/*
 * Convert from internal to external notation
 */

static short int
to_external(internal)
short int internal;
{
    short int  external;

    if (internal & IPX_NONE)
        external = IPX_NONE;
    else
        external = RIP_SAP;

    return external;
}

/*
 * Make a string representation of a network IP address.
 */

char *
ipx_ntoa(ipxaddr)
u_int32_t ipxaddr;
{
    static char b[64];
    sprintf(b, "%x", ipxaddr);
    return b;
}


/*
 * ipxcp_init - Initialize IPXCP.
 */
static void
ipxcp_init(unit)
    int unit;
{
    fsm *f = &ipxcp_fsm[unit];

    f->unit  = unit;
    f->protocol    = PPP_IPXCP;
    f->callbacks = &ipxcp_callbacks;
    fsm_init(&ipxcp_fsm[unit]);

    memset (wo->name,     0, sizeof (wo->name));
    memset (wo->our_node, 0, sizeof (wo->our_node));
    memset (wo->his_node, 0, sizeof (wo->his_node));

    wo->neg_nn           = 1;
    wo->neg_complete   = 1;
    wo->network          = 0;

    ao->neg_node       = 1;
    ao->neg_nn           = 1;
    ao->neg_name       = 1;
    ao->neg_complete   = 1;
    ao->neg_router     = 1;

    ao->accept_local   = 0;
    ao->accept_remote  = 0;
    ao->accept_network = 0;

    wo->tried_rip      = 0;
    wo->tried_nlsp     = 0;
}

/*
 * Copy the node number
 */

static void
copy_node (src, dst)
u_char *src, *dst;
{
    memcpy (dst, src, sizeof (ipxcp_wantoptions[0].our_node));
}

/*
 * Compare node numbers
 */

static int
compare_node (src, dst)
u_char *src, *dst;
{
    return memcmp (dst, src, sizeof (ipxcp_wantoptions[0].our_node)) == 0;
}

/*
 * Is the node number zero?
 */

static int
zero_node (node)
u_char *node;
{
    int indx;
    for (indx = 0; indx < sizeof (ipxcp_wantoptions[0].our_node); ++indx)
      if (node [indx] != 0)
          return 0;
    return 1;
}

/*
 * Increment the node number
 */

static void
inc_node (node)
u_char *node;
{
    u_char   *outp;
    u_int32_t magic_num;

    outp      = node;
    magic_num = magic();
    *outp++   = '\0';
    *outp++   = '\0';
    PUTLONG (magic_num, outp);
}

/*
 * ipxcp_open - IPXCP is allowed to come up.
 */
static void
ipxcp_open(unit)
    int unit;
{
    fsm_open(&ipxcp_fsm[unit]);
}

/*
 * ipxcp_close - Take IPXCP down.
 */
static void
ipxcp_close(unit, reason)
    int unit;
    char *reason;
{
    fsm_close(&ipxcp_fsm[unit], reason);
}


/*
 * ipxcp_lowerup - The lower layer is up.
 */
static void
ipxcp_lowerup(unit)
    int unit;
{
    fsm_lowerup(&ipxcp_fsm[unit]);
}


/*
 * ipxcp_lowerdown - The lower layer is down.
 */
static void
ipxcp_lowerdown(unit)
    int unit;
{
    fsm_lowerdown(&ipxcp_fsm[unit]);
}


/*
 * ipxcp_input - Input IPXCP packet.
 */
static void
ipxcp_input(unit, p, len)
    int unit;
    u_char *p;
    int len;
{
    fsm_input(&ipxcp_fsm[unit], p, len);
}


/*
 * ipxcp_protrej - A Protocol-Reject was received for IPXCP.
 *
 * Pretend the lower layer went down, so we shut up.
 */
static void
ipxcp_protrej(unit)
    int unit;
{
    fsm_lowerdown(&ipxcp_fsm[unit]);
}


/*
 * ipxcp_resetci - Reset our CI.
 */
static void
ipxcp_resetci(f)
    fsm *f;
{
    wo->req_node = wo->neg_node && ao->neg_node;
    wo->req_nn     = wo->neg_nn     && ao->neg_nn;

    if (wo->our_network == 0) {
      wo->neg_node         = 1;
      ao->accept_network = 1;
    }
/*
 * If our node number is zero then change it.
 */
    if (zero_node (wo->our_node)) {
      inc_node (wo->our_node);
      ao->accept_local = 1;
      wo->neg_node       = 1;
    }
/*
 * If his node number is zero then change it.
 */
    if (zero_node (wo->his_node)) {
      inc_node (wo->his_node);
      ao->accept_remote = 1;
    }
/*
 * If no routing agent was specified then we do RIP/SAP according to the
 * RFC documents. If you have specified something then OK. Otherwise, we
 * do RIP/SAP.
 */
    if (ao->router == 0) {
      ao->router |= BIT(RIP_SAP);
      wo->router |= BIT(RIP_SAP);
    }

    /* Always specify a routing protocol unless it was REJected. */
    wo->neg_router = 1;
/*
 * Start with these default values
 */
    *go = *wo;
}

/*
 * ipxcp_cilen - Return length of our CI.
 */

static int
ipxcp_cilen(f)
    fsm *f;
{
    int len;

    len      = go->neg_nn         ? CILEN_NETN     : 0;
    len += go->neg_node     ? CILEN_NODEN    : 0;
    len += go->neg_name     ? CILEN_NAME + strlen (go->name) - 1 : 0;

    /* RFC says that defaults should not be included. */
    if (go->neg_router && to_external(go->router) != RIP_SAP)
        len += CILEN_PROTOCOL;

    return (len);
}


/*
 * ipxcp_addci - Add our desired CIs to a packet.
 */
static void
ipxcp_addci(f, ucp, lenp)
    fsm *f;
    u_char *ucp;
    int *lenp;
{
/*
 * Add the options to the record.
 */
    if (go->neg_nn) {
      PUTCHAR (IPX_NETWORK_NUMBER, ucp);
      PUTCHAR (CILEN_NETN, ucp);
      PUTLONG (go->our_network, ucp);
    }

    if (go->neg_node) {
      int indx;
      PUTCHAR (IPX_NODE_NUMBER, ucp);
      PUTCHAR (CILEN_NODEN, ucp);
      for (indx = 0; indx < sizeof (go->our_node); ++indx)
          PUTCHAR (go->our_node[indx], ucp);
    }

    if (go->neg_name) {
      int cilen = strlen (go->name);
      int indx;
      PUTCHAR (IPX_ROUTER_NAME, ucp);
      PUTCHAR (CILEN_NAME + cilen - 1, ucp);
      for (indx = 0; indx < cilen; ++indx)
          PUTCHAR (go->name [indx], ucp);
    }

    if (go->neg_router) {
        short external = to_external (go->router);
      if (external != RIP_SAP) {
          PUTCHAR  (IPX_ROUTER_PROTOCOL, ucp);
          PUTCHAR  (CILEN_PROTOCOL,      ucp);
          PUTSHORT (external,            ucp);
      }
    }
}

/*
 * ipxcp_ackci - Ack our CIs.
 *
 * Returns:
 *    0 - Ack was bad.
 *    1 - Ack was good.
 */
static int
ipxcp_ackci(f, p, len)
    fsm *f;
    u_char *p;
    int len;
{
    u_short cilen, citype, cishort;
    u_char cichar;
    u_int32_t cilong;

#define ACKCIVOID(opt, neg) \
    if (neg) { \
      if ((len -= CILEN_VOID) < 0) \
          break; \
      GETCHAR(citype, p); \
      GETCHAR(cilen, p); \
      if (cilen != CILEN_VOID || \
          citype != opt) \
          break; \
    }

#define ACKCICOMPLETE(opt,neg)      ACKCIVOID(opt, neg)

#define ACKCICHARS(opt, neg, val, cnt) \
    if (neg) { \
      int indx, count = cnt; \
      len -= (count + 2); \
      if (len < 0) \
          break; \
      GETCHAR(citype, p); \
      GETCHAR(cilen, p); \
      if (cilen != (count + 2) || \
          citype != opt) \
          break; \
      for (indx = 0; indx < count; ++indx) {\
          GETCHAR(cichar, p); \
          if (cichar != ((u_char *) &val)[indx]) \
             break; \
      }\
      if (indx != count) \
          break; \
    }

#define ACKCINODE(opt,neg,val) ACKCICHARS(opt,neg,val,sizeof(val))
#define ACKCINAME(opt,neg,val) ACKCICHARS(opt,neg,val,strlen(val))

#define ACKCINETWORK(opt, neg, val) \
    if (neg) { \
      if ((len -= CILEN_NETN) < 0) \
          break; \
      GETCHAR(citype, p); \
      GETCHAR(cilen, p); \
      if (cilen != CILEN_NETN || \
          citype != opt) \
          break; \
      GETLONG(cilong, p); \
      if (cilong != val) \
          break; \
    }

#define ACKCIPROTO(opt, neg, val) \
    if (neg) { \
      if (len < 2) \
          break; \
      GETCHAR(citype, p); \
      GETCHAR(cilen, p); \
      if (cilen != CILEN_PROTOCOL || citype != opt) \
          break; \
      len -= cilen; \
      if (len < 0) \
          break; \
      GETSHORT(cishort, p); \
      if (cishort != to_external (val) || cishort == RIP_SAP) \
          break; \
      }
/*
 * Process the ACK frame in the order in which the frame was assembled
 */
    do {
      ACKCINETWORK  (IPX_NETWORK_NUMBER,  go->neg_nn,     go->our_network);
      ACKCINODE     (IPX_NODE_NUMBER,         go->neg_node,   go->our_node);
      ACKCINAME     (IPX_ROUTER_NAME,         go->neg_name,   go->name);
      ACKCIPROTO    (IPX_ROUTER_PROTOCOL, go->neg_router, go->router);
      ACKCIPROTO    (IPX_ROUTER_PROTOCOL, go->neg_router, go->router);
      ACKCIPROTO    (IPX_ROUTER_PROTOCOL, go->neg_router, go->router);
/*
 * This is the end of the record.
 */
      if (len == 0)
          return (1);
    } while (0);
/*
 * The frame is invalid
 */
    IPXCPDEBUG((LOG_INFO, "ipxcp_ackci: received bad Ack!"));
    return (0);
}

/*
 * ipxcp_nakci - Peer has sent a NAK for some of our CIs.
 * This should not modify any state if the Nak is bad
 * or if IPXCP is in the OPENED state.
 *
 * Returns:
 *    0 - Nak was bad.
 *    1 - Nak was good.
 */

static int
ipxcp_nakci(f, p, len)
    fsm *f;
    u_char *p;
    int len;
{
    u_char citype, cilen, *next;
    u_short s;
    u_int32_t l;
    ipxcp_options no;         /* options we've seen Naks for */
    ipxcp_options try;        /* options to request next time */

    BZERO(&no, sizeof(no));
    try = *go;

    while (len > CILEN_VOID) {
      GETCHAR (citype, p);
      GETCHAR (cilen,    p);
      len -= cilen;
      if (len < 0)
          goto bad;
      next = &p [cilen - CILEN_VOID];

      switch (citype) {
      case IPX_NETWORK_NUMBER:
          if (!go->neg_nn || no.neg_nn || (cilen != CILEN_NETN))
            goto bad;
          no.neg_nn = 1;

          GETLONG(l, p);
          IPXCPDEBUG((LOG_INFO, "local IP address %d", l));
          if (l && ao->accept_network)
            try.our_network = l;
          break;

      case IPX_NODE_NUMBER:
          if (!go->neg_node || no.neg_node || (cilen != CILEN_NODEN))
            goto bad;
          no.neg_node = 1;

          IPXCPDEBUG((LOG_INFO,
                  "local node number %02X%02X%02X%02X%02X%02X",
                  NODE(p)));

          if (!zero_node (p) && ao->accept_local &&
            ! compare_node (p, ho->his_node))
            copy_node (p, try.our_node);
          break;

          /* This has never been sent. Ignore the NAK frame */
      case IPX_COMPRESSION_PROTOCOL:
          goto bad;

      case IPX_ROUTER_PROTOCOL:
          if (!go->neg_router || (cilen < CILEN_PROTOCOL))
            goto bad;

          GETSHORT (s, p);
          if (s > 15)         /* This is just bad, but ignore for now. */
              break;

          s = BIT(s);
          if (no.router & s)  /* duplicate NAKs are always bad */
            goto bad;

          if (no.router == 0) /* Reset on first NAK only */
            try.router = 0;

          no.router      |= s;
          try.router     |= s;
          try.neg_router  = 1;

          IPXCPDEBUG((LOG_INFO, "Router protocol number %d", s));
          break;

          /* These, according to the RFC, must never be NAKed. */
      case IPX_ROUTER_NAME:
      case IPX_COMPLETE:
          goto bad;

          /* These are for options which we have not seen. */
      default:
          break;
      }
      p = next;
    }

    /* If there is still anything left, this packet is bad. */
    if (len != 0)
      goto bad;

    /*
     * Do not permit the peer to force a router protocol which we do not
     * support. However, default to the condition that will accept "NONE".
     */
    try.router &= (ao->router | BIT(IPX_NONE));
    if (try.router == 0 && ao->router != 0)
      try.router = BIT(IPX_NONE);

    if (try.router != 0)
        try.neg_router = 1;
    
    /*
     * OK, the Nak is good.  Now we can update state.
     */
    if (f->state != OPENED)
      *go = try;

    return 1;

bad:
    IPXCPDEBUG((LOG_INFO, "ipxcp_nakci: received bad Nak!"));
    return 0;
}

/*
 * ipxcp_rejci - Reject some of our CIs.
 */
static int
ipxcp_rejci(f, p, len)
    fsm *f;
    u_char *p;
    int len;
{
    u_short cilen, citype, cishort;
    u_char cichar;
    u_int32_t cilong;
    ipxcp_options try;        /* options to request next time */

#define REJCINETWORK(opt, neg, val) \
    if (neg && p[0] == opt) { \
      if ((len -= CILEN_NETN) < 0) \
          break; \
      GETCHAR(citype, p); \
      GETCHAR(cilen, p); \
      if (cilen != CILEN_NETN || \
          citype != opt) \
          break; \
      GETLONG(cilong, p); \
      if (cilong != val) \
          break; \
      IPXCPDEBUG((LOG_INFO,"ipxcp_rejci rejected long opt %d", opt)); \
      neg = 0; \
    }

#define REJCICHARS(opt, neg, val, cnt) \
    if (neg && p[0] == opt) { \
      int indx, count = cnt; \
      len -= (count + 2); \
      if (len < 0) \
          break; \
      GETCHAR(citype, p); \
      GETCHAR(cilen, p); \
      if (cilen != (count + 2) || \
          citype != opt) \
          break; \
      for (indx = 0; indx < count; ++indx) {\
          GETCHAR(cichar, p); \
          if (cichar != ((u_char *) &val)[indx]) \
             break; \
      }\
      if (indx != count) \
          break; \
      IPXCPDEBUG((LOG_INFO,"ipxcp_rejci rejected opt %d", opt)); \
      neg = 0; \
    }

#define REJCINODE(opt,neg,val) REJCICHARS(opt,neg,val,sizeof(val))
#define REJCINAME(opt,neg,val) REJCICHARS(opt,neg,val,strlen(val))

#define REJCIVOID(opt, neg) \
    if (neg && p[0] == opt) { \
      if ((len -= CILEN_VOID) < 0) \
          break; \
      GETCHAR(citype, p); \
      GETCHAR(cilen, p); \
      if (cilen != CILEN_VOID || citype != opt) \
          break; \
      IPXCPDEBUG((LOG_INFO, "ipxcp_rejci rejected void opt %d", opt)); \
      neg = 0; \
    }

/* a reject for RIP/SAP is invalid since we don't send it and you can't
   reject something which is not sent. (You can NAK, but you can't REJ.) */
#define REJCIPROTO(opt, neg, val, bit) \
    if (neg && p[0] == opt) { \
      if ((len -= CILEN_PROTOCOL) < 0) \
          break; \
      GETCHAR(citype, p); \
      GETCHAR(cilen, p); \
      if (cilen != CILEN_PROTOCOL) \
          break; \
      GETSHORT(cishort, p); \
      if (cishort != to_external (val) || cishort == RIP_SAP) \
          break; \
      IPXCPDEBUG((LOG_INFO, "ipxcp_rejci short opt %d", opt)); \
      neg = 0; \
    }
/*
 * Any Rejected CIs must be in exactly the same order that we sent.
 * Check packet length and CI length at each step.
 * If we find any deviations, then this packet is bad.
 */
    try = *go;

    do {
      REJCINETWORK (IPX_NETWORK_NUMBER,  try.neg_nn,     try.our_network);
      REJCINODE    (IPX_NODE_NUMBER,         try.neg_node,   try.our_node);
      REJCINAME    (IPX_ROUTER_NAME,         try.neg_name,   try.name);
      REJCIPROTO   (IPX_ROUTER_PROTOCOL, try.neg_router, try.router, 0);
/*
 * This is the end of the record.
 */
      if (len == 0) {
          if (f->state != OPENED)
            *go = try;
          return (1);
      }
    } while (0);
/*
 * The frame is invalid at this point.
 */
    IPXCPDEBUG((LOG_INFO, "ipxcp_rejci: received bad Reject!"));
    return 0;
}

/*
 * ipxcp_reqci - Check the peer's requested CIs and send appropriate response.
 *
 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
 * appropriately.  If reject_if_disagree is non-zero, doesn't return
 * CONFNAK; returns CONFREJ if it can't return CONFACK.
 */
static int
ipxcp_reqci(f, inp, len, reject_if_disagree)
    fsm *f;
    u_char *inp;        /* Requested CIs */
    int *len;                 /* Length of requested CIs */
    int reject_if_disagree;
{
    u_char *cip, *next;       /* Pointer to current and next CIs */
    u_short cilen, citype;    /* Parsed len, type */
    u_short cishort;          /* Parsed short value */
    u_int32_t cinetwork;      /* Parsed address values */
    int rc = CONFACK;         /* Final packet return code */
    int orc;                  /* Individual option return code */
    u_char *p;                /* Pointer to next char to parse */
    u_char *ucp = inp;        /* Pointer to current output char */
    int l = *len;       /* Length left */

    /*
     * Reset all his options.
     */
    BZERO(ho, sizeof(*ho));
    
    /*
     * Process all his options.
     */
    next = inp;
    while (l) {
      orc = CONFACK;                /* Assume success */
      cip = p = next;               /* Remember begining of CI */
      if (l < 2 ||                  /* Not enough data for CI header or */
          p[1] < 2 ||               /*  CI length too small or */
          p[1] > l) {               /*  CI length too big? */
          IPXCPDEBUG((LOG_INFO, "ipxcp_reqci: bad CI length!"));
          orc = CONFREJ;            /* Reject bad CI */
          cilen = l;                /* Reject till end of packet */
          l = 0;              /* Don't loop again */
          goto endswitch;
      }
      GETCHAR(citype, p);           /* Parse CI type */
      GETCHAR(cilen, p);            /* Parse CI length */
      l -= cilen;             /* Adjust remaining length */
      next += cilen;                /* Step to next CI */

      switch (citype) {       /* Check CI type */
/*
 * The network number must match. Choose the larger of the two.
 */
      case IPX_NETWORK_NUMBER:
          IPXCPDEBUG((LOG_INFO, "ipxcp: received Network Number request"));
          
          /* if we wont negotiate the network number or the length is wrong
             then reject the option */
          if ( !ao->neg_nn || cilen != CILEN_NETN ) {
            orc = CONFREJ;
            break;            
          }
          GETLONG(cinetwork, p);
          IPXCPDEBUG((LOG_INFO,"Remote proposed IPX network number is %8Lx",tl));

          /* If the network numbers match then acknowledge them. */
          if (cinetwork != 0) {
            ho->his_network = cinetwork;
            ho->neg_nn  = 1;
            if (wo->our_network == cinetwork)
                break;
/*
 * If the network number is not given or we don't accept their change or
 * the network number is too small then NAK it.
 */
            if (! ao->accept_network || cinetwork < wo->our_network) {
                DECPTR (sizeof (u_int32_t), p);
                PUTLONG (wo->our_network, p);
                orc = CONFNAK;
            }
            break;
          }
/*
 * The peer sent '0' for the network. Give it ours if we have one.
 */
          if (go->our_network != 0) {
            DECPTR (sizeof (u_int32_t), p);
            PUTLONG (wo->our_network, p);
            orc = CONFNAK;
/*
 * We don't have one. Reject the value.
 */
          } else
            orc = CONFREJ;

          break;
/*
 * The node number is required
 */
      case IPX_NODE_NUMBER:
          IPXCPDEBUG((LOG_INFO, "ipxcp: received Node Number request"));

          /* if we wont negotiate the node number or the length is wrong
             then reject the option */
          if ( cilen != CILEN_NODEN ) {
            orc = CONFREJ;
            break;
          }

          copy_node (p, ho->his_node);
          ho->neg_node = 1;
/*
 * If the remote does not have a number and we do then NAK it with the value
 * which we have for it. (We never have a default value of zero.)
 */
          if (zero_node (ho->his_node)) {
            orc = CONFNAK;
            copy_node (wo->his_node, p);
            INCPTR (sizeof (wo->his_node), p);
            break;
          }
/*
 * If you have given me the expected network node number then I'll accept
 * it now.
 */
          if (compare_node (wo->his_node, ho->his_node)) {
            orc = CONFACK;
            ho->neg_node = 1;
            INCPTR (sizeof (wo->his_node), p);
            break;
          }
/*
 * If his node number is the same as ours then ask him to try the next
 * value.
 */
          if (compare_node (ho->his_node, go->our_node)) {
            inc_node (ho->his_node);
            orc = CONFNAK;
            copy_node (ho->his_node, p);
            INCPTR (sizeof (wo->his_node), p);
            break;
          }
/*
 * If we don't accept a new value then NAK it.
 */
          if (! ao->accept_remote) {
            copy_node (wo->his_node, p);
            INCPTR (sizeof (wo->his_node), p);
            orc = CONFNAK;
            break;
          }
          orc = CONFACK;
          ho->neg_node = 1;
          INCPTR (sizeof (wo->his_node), p);
          break;
/*
 * Compression is not desired at this time. It is always rejected.
 */
      case IPX_COMPRESSION_PROTOCOL:
          IPXCPDEBUG((LOG_INFO, "ipxcp: received Compression Protocol request "));
          orc = CONFREJ;
          break;
/*
 * The routing protocol is a bitmask of various types. Any combination
 * of the values RIP_SAP and NLSP are permissible. 'IPX_NONE' for no
 * routing protocol must be specified only once.
 */
      case IPX_ROUTER_PROTOCOL:
          if ( !ao->neg_router || cilen < CILEN_PROTOCOL ) {
            orc = CONFREJ;
            break;            
          }

          GETSHORT (cishort, p);
          IPXCPDEBUG((LOG_INFO,
                  "Remote router protocol number 0x%04x",
                  cishort));

          if (wo->neg_router == 0) {
              wo->neg_router = 1;
            wo->router     = BIT(IPX_NONE);
          }

          if ((cishort == IPX_NONE && ho->router != 0) ||
            (ho->router & BIT(IPX_NONE))) {
            orc = CONFREJ;
            break;
          }

          cishort = BIT(cishort);
          if (ho->router & cishort) {
            orc = CONFREJ;
            break;
          }

          ho->router      |= cishort;
          ho->neg_router = 1;

          /* Finally do not allow a router protocol which we do not
             support. */

          if ((cishort & (ao->router | BIT(IPX_NONE))) == 0) {
              int protocol;

            if (cishort == BIT(NLSP) &&
                (ao->router & BIT(RIP_SAP)) &&
                !wo->tried_rip) {
                protocol      = RIP_SAP;
                wo->tried_rip = 1;
            } else
                protocol = IPX_NONE;

            DECPTR (sizeof (u_int16_t), p);
            PUTSHORT (protocol, p);
            orc = CONFNAK;
          }
          break;
/*
 * The router name is advisorary. Just accept it if it is not too large.
 */
      case IPX_ROUTER_NAME:
          IPXCPDEBUG((LOG_INFO, "ipxcp: received Router Name request"));
          if (cilen >= CILEN_NAME) {
            int name_size = cilen - CILEN_NAME;
            if (name_size > sizeof (ho->name))
                name_size = sizeof (ho->name) - 1;
            memset (ho->name, 0, sizeof (ho->name));
            memcpy (ho->name, p, name_size);
            ho->name [name_size] = '\0';
            ho->neg_name = 1;
            orc = CONFACK;
            break;
          }
          orc = CONFREJ;
          break;
/*
 * This is advisorary.
 */
      case IPX_COMPLETE:
          IPXCPDEBUG((LOG_INFO, "ipxcp: received Complete request"));
          if (cilen != CILEN_COMPLETE)
            orc = CONFREJ;
          else {
            ho->neg_complete = 1;
            orc = CONFACK;
          }
          break;
/*
 * All other entries are not known at this time.
 */
      default:
          IPXCPDEBUG((LOG_INFO, "ipxcp: received Complete request"));
          orc = CONFREJ;
          break;
      }

endswitch:
      IPXCPDEBUG((LOG_INFO, " (%s)\n", CODENAME(orc)));

      if (orc == CONFACK &&         /* Good CI */
          rc != CONFACK)            /*  but prior CI wasnt? */
          continue;                 /* Don't send this one */

      if (orc == CONFNAK) {         /* Nak this CI? */
          if (reject_if_disagree)   /* Getting fed up with sending NAKs? */
            orc = CONFREJ;          /* Get tough if so */
          if (rc == CONFREJ)        /* Rejecting prior CI? */
            continue;         /* Don't send this one */
          if (rc == CONFACK) {      /* Ack'd all prior CIs? */
            rc  = CONFNAK;          /* Not anymore... */
            ucp = inp;        /* Backup */
          }
      }

      if (orc == CONFREJ &&         /* Reject this CI */
          rc != CONFREJ) {          /*  but no prior ones? */
          rc = CONFREJ;
          ucp = inp;                /* Backup */
      }

      /* Need to move CI? */
      if (ucp != cip)
          BCOPY(cip, ucp, cilen);   /* Move it */

      /* Update output pointer */
      INCPTR(cilen, ucp);
    }

    /*
     * If we aren't rejecting this packet, and we want to negotiate
     * their address, and they didn't send their address, then we
     * send a NAK with an IPX_NODE_NUMBER option appended. We assume the
     * input buffer is long enough that we can append the extra
     * option safely.
     */

    if (rc != CONFREJ && !ho->neg_node &&
      wo->req_nn && !reject_if_disagree) {
      if (rc == CONFACK) {
          rc = CONFNAK;
          wo->req_nn = 0;           /* don't ask again */
          ucp = inp;                /* reset pointer */
      }

      if (zero_node (wo->his_node))
          inc_node (wo->his_node);

      PUTCHAR (IPX_NODE_NUMBER, ucp);
      PUTCHAR (CILEN_NODEN, ucp);
      copy_node (wo->his_node, ucp);
      INCPTR (sizeof (wo->his_node), ucp);
    }

    *len = ucp - inp;               /* Compute output length */
    IPXCPDEBUG((LOG_INFO, "ipxcp: returning Configure-%s", CODENAME(rc)));
    return (rc);              /* Return final code */
}

/*
 * ipxcp_up - IPXCP has come UP.
 *
 * Configure the IP network interface appropriately and bring it up.
 */

static void
ipxcp_up(f)
    fsm *f;
{
    int unit = f->unit;

    IPXCPDEBUG((LOG_INFO, "ipxcp: up"));

    /* The default router protocol is RIP/SAP. */
    if (ho->router == 0)
        ho->router = BIT(RIP_SAP);

    if (go->router == 0)
        go->router = BIT(RIP_SAP);

    /* Fetch the network number */
    if (!ho->neg_nn)
      ho->his_network = wo->his_network;

    if (!ho->neg_node)
      copy_node (wo->his_node, ho->his_node);

    if (!wo->neg_node && !go->neg_node)
      copy_node (wo->our_node, go->our_node);

    if (zero_node (go->our_node)) {
        static char errmsg[] = "Could not determine local IPX node address";
      IPXCPDEBUG((LOG_ERR, errmsg));
      ipxcp_close(f->unit, errmsg);
      return;
    }

    go->network = go->our_network;
    if (ho->his_network != 0 && ho->his_network > go->network)
      go->network = ho->his_network;

    if (go->network == 0) {
        static char errmsg[] = "Can not determine network number";
      IPXCPDEBUG((LOG_ERR, errmsg));
      ipxcp_close (unit, errmsg);
      return;
    }

    /* bring the interface up */
    if (!sifup(unit)) {
      IPXCPDEBUG((LOG_WARNING, "sifup failed"));
      ipxcp_close(unit, "Interface configuration failed");
      return;
    }

    /* set the network number for IPX */
    if (!sipxfaddr(unit, go->network, go->our_node)) {
      IPXCPDEBUG((LOG_WARNING, "sipxfaddr failed"));
      ipxcp_close(unit, "Interface configuration failed");
      return;
    }

    /*
     * Execute the ipx-up script, like this:
     *      /etc/ppp/ipx-up interface tty speed local-IPX remote-IPX
     */

    ipxcp_script (f, _PATH_IPXUP);
}

/*
 * ipxcp_down - IPXCP has gone DOWN.
 *
 * Take the IP network interface down, clear its addresses
 * and delete routes through it.
 */

static void
ipxcp_down(f)
    fsm *f;
{
    IPXCPDEBUG((LOG_INFO, "ipxcp: down"));

    cipxfaddr (f->unit);
    sifdown(f->unit);
    ipxcp_script (f, _PATH_IPXDOWN);
}


/*
 * ipxcp_script - Execute a script with arguments
 * interface-name tty-name speed local-IPX remote-IPX networks.
 */
static void
ipxcp_script(f, script)
    fsm *f;
    char *script;
{
    char strspeed[32],   strlocal[32],       strremote[32];
    char strnetwork[32], strpid[32];
    char *argv[14],      strproto_lcl[32], strproto_rmt[32];

    sprintf (strpid,   "%d", getpid());
    sprintf (strspeed, "%d", baud_rate);

    strproto_lcl[0] = '\0';
    if (go->neg_router && ((go->router & BIT(IPX_NONE)) == 0)) {
      if (go->router & BIT(RIP_SAP))
          strcpy (strproto_lcl, "RIP ");
      if (go->router & BIT(NLSP))
          strcat (strproto_lcl, "NLSP ");
    }

    if (strproto_lcl[0] == '\0')
      strcpy (strproto_lcl, "NONE ");

    strproto_lcl[strlen (strproto_lcl)-1] = '\0';

    strproto_rmt[0] = '\0';
    if (ho->neg_router && ((ho->router & BIT(IPX_NONE)) == 0)) {
      if (ho->router & BIT(RIP_SAP))
          strcpy (strproto_rmt, "RIP ");
      if (ho->router & BIT(NLSP))
          strcat (strproto_rmt, "NLSP ");
    }

    if (strproto_rmt[0] == '\0')
      strcpy (strproto_rmt, "NONE ");

    strproto_rmt[strlen (strproto_rmt)-1] = '\0';

    strcpy (strnetwork, ipx_ntoa (go->network));

    sprintf (strlocal,
           "%02X%02X%02X%02X%02X%02X",
           NODE(go->our_node));

    sprintf (strremote,
           "%02X%02X%02X%02X%02X%02X",
           NODE(ho->his_node));

    argv[0]  = script;
    argv[1]  = ifname;
    argv[2]  = devnam;
    argv[3]  = strspeed;
    argv[4]  = strnetwork;
    argv[5]  = strlocal;
    argv[6]  = strremote;
    argv[7]  = strproto_lcl;
    argv[8]  = strproto_rmt;
    argv[9]  = go->name;
    argv[10] = ho->name;
    argv[11] = ipparam;
    argv[12] = strpid;
    argv[13] = NULL;
    run_program(script, argv, 0);
}

/*
 * ipxcp_printpkt - print the contents of an IPXCP packet.
 */
static char *ipxcp_codenames[] = {
    "ConfReq", "ConfAck", "ConfNak", "ConfRej",
    "TermReq", "TermAck", "CodeRej"
};

static int
ipxcp_printpkt(p, plen, printer, arg)
    u_char *p;
    int plen;
    void (*printer) __P((void *, char *, ...));
    void *arg;
{
    int code, id, len, olen;
    u_char *pstart, *optend;
    u_short cishort;
    u_int32_t cilong;

    if (plen < HEADERLEN)
      return 0;
    pstart = p;
    GETCHAR(code, p);
    GETCHAR(id, p);
    GETSHORT(len, p);
    if (len < HEADERLEN || len > plen)
      return 0;

    if (code >= 1 && code <= sizeof(ipxcp_codenames) / sizeof(char *))
      printer(arg, " %s", ipxcp_codenames[code-1]);
    else
      printer(arg, " code=0x%x", code);
    printer(arg, " id=0x%x", id);
    len -= HEADERLEN;
    switch (code) {
    case CONFREQ:
    case CONFACK:
    case CONFNAK:
    case CONFREJ:
      /* print option list */
      while (len >= 2) {
          GETCHAR(code, p);
          GETCHAR(olen, p);
          p -= 2;
          if (olen < CILEN_VOID || olen > len) {
            break;
          }
          printer(arg, " <");
          len -= olen;
          optend = p + olen;
          switch (code) {
          case IPX_NETWORK_NUMBER:
            if (olen == CILEN_NETN) {
                p += 2;
                GETLONG(cilong, p);
                printer (arg, "network %s", ipx_ntoa (cilong));
            }
            break;
          case IPX_NODE_NUMBER:
            if (olen == CILEN_NODEN) {
                p += 2;
                printer (arg, "node ");
                while (p < optend) {
                  GETCHAR(code, p);
                  printer(arg, "%.2x", (int) (unsigned int) (unsigned char) code);
                }
            }
            break;
          case IPX_COMPRESSION_PROTOCOL:
            if (olen == CILEN_COMPRESS) {
                p += 2;
                GETSHORT (cishort, p);
                printer (arg, "compression %d", (int) cishort);
            }
            break;
          case IPX_ROUTER_PROTOCOL:
            if (olen == CILEN_PROTOCOL) {
                p += 2;
                GETSHORT (cishort, p);
                printer (arg, "router proto %d", (int) cishort);
            }
            break;
          case IPX_ROUTER_NAME:
            if (olen >= CILEN_NAME) {
                p += 2;
                printer (arg, "router name \"");
                while (p < optend) {
                  GETCHAR(code, p);
                  if (code >= 0x20 && code <= 0x7E)
                      printer (arg, "%c", (int) (unsigned int) (unsigned char) code);
                  else
                      printer (arg, " \\%.2x", (int) (unsigned int) (unsigned char) code);
                }
                printer (arg, "\"");
            }
            break;
          case IPX_COMPLETE:
            if (olen == CILEN_COMPLETE) {
                p += 2;
                printer (arg, "complete");
            }
            break;
          default:
            break;
          }

          while (p < optend) {
            GETCHAR(code, p);
            printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code);
          }
          printer(arg, ">");
      }
      break;

    case TERMACK:
    case TERMREQ:
      if (len > 0 && *p >= ' ' && *p < 0x7f) {
          printer(arg, " ");
          print_string(p, len, printer, arg);
          p += len;
          len = 0;
      }
      break;
    }

    /* print the rest of the bytes in the packet */
    for (; len > 0; --len) {
      GETCHAR(code, p);
      printer(arg, " %.2x", (int) (unsigned int) (unsigned char) code);
    }

    return p - pstart;
}
#endif /* ifdef IPX_CHANGE */

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