Added port of ppp-2.3.5 from Tomasz Domin <dot@comarch.pl> of ComArch SA.

Tomasz only tested this on the mpc823.

The official site for the original source for this PPP implementation is:

ftp://cs.anu.edu.au/pub/software/ppp

NOTE:  As of 11/30/1999, the current version of this source is 2.3.10.

1 files changed, 1399 insertions, 0 deletions

diff --git a/cpukit/pppd/ipxcp.c b/cpukit/pppd/ipxcp.c
new file mode 100644
index 0000000000..be85f31231
--- /dev/null
+++ b/cpukit/pppd/ipxcp.c
@@ -0,0 +1,1399 @@
+/*
+ * 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[] = "$Id$"; */
+#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(gpt, 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 a 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 */