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ROUTING.C
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1989-08-29
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130 lines
/*
* Copyright 1988 by the Radio Amateur Telecommunications Society
* and Thomas A. Moulton, W2VY
*
* This software may only be modified, copied, distributed or
* executed for non-profit purposes by individuals operating
* systems in the Amateur Radio Service. Credit to the
* author(s) and to the Radio Amateur Telecommunications Society
* must be made in modules where RATS provided software is used,
* and in any announcements and documentation.
*
* As a non-profit, research and development organization, the
* Radio Amateur Telecommunications Society distributes software
* in both executable and source forms. This policy is in place
* to encourage the development and distribution of OSI-based,
* networking tools. In order to protect the interests of the
* Society and the authors, we have placed some conditions
* of use on the software. Other groups are encouraged
* to place the same or similar guidelines on
* software they produce.
*
* The Radio Amateur Telecommunications Society reserves the right
* to specify and alter the terms under which software provided by
* the Society may be used. This policy is consistent with the
* objective of uniform and consistent "Open Systems Interconnections."
*
* All acceptable Amateur Radio related uses of this software
* will be outlined in the "ROSE Implementer's Guide". Individuals
* or organizations wishing to add to, or modify the provisions of
* the guide to accommodate local or evolutionary requirements
* should document the proposed change(s) and forward them to the
* Society. If accepted, written notification will be provided by
* the Society to the submitting organization or individual(s).
* The Society will then issue a "ROSE Implementer's Guide Change
* Notice". Periodically, the Society will re-issue the "ROSE
* Implementer's Guide" and incorporate the text of the change
* notices. This procedure has been put in to place to ensure
* compatibility between systems and to ensure their "Openness"
* and interoperability.
*
* No part of this software may be used in other packages
* without prior authorization from the author or the Society.
* Software incorporating this module, all or in part, must be
* provided to the Society prior to distribution or use by
* anyone not directly involved in testing of the revised
* environment. Current releases of the combined software must
* be provided to the Society in both source and executable
* forms. Adequate documention to produce an executable module
* from the provided source must also be included.
*
* Non-Amateur Radio non-profit uses may be authorized on a case
* by case basis. Inquiries for such use may be made in writing
* to the Society. Non-commercial uses consistent with the
* general principles of Open Systems Interconnection Reference
* Model will be generally considered with favor.
*
* Commercial licensing of the software is also available based
* on normal commercial terms. Licensing inquiries should be
* directed to the Society. Commercial licensing of the standard
* software will be done in situations which materially benefit
* the Amateur Radio Packet Network. Additional licensing is
* reserved by the individual authors.
*
* The Radio Amateur Telecommunications Society provides this software
* on an "as is" basis. The Society assumes no liability for
* loss incurred through the use of this software. Amateur Radio
* use of this software implies non-commercial and voluntary
* development, deployment and use of this software in a "Amateur",
* non-commercial service. Commercial users are encouraged to
* inspect their copies of the source code. Source code modification
* licenses are available if a combined Object and Source Code
* license was not originally established.
*
* The Society may be contacted by writing or calling at:
*
* The Radio Amateur Telecommunications Society
* 206 North Vivyen Street.
* Bergenfield, New Jersey 07621
*
* Telephone: 201-387-8896
*
*/
#include "data.h"
#include "buffer.h"
#include "ax25.h"
#include "l3struc.h"
#include "x25cause.h"
extern unsigned char RTable[];
extern unsigned char NPAroute[][16];
int check_x121();
find_route(ptr,x121)
unsigned char **ptr;
unsigned char x121[];
{
static unsigned char i, lensv;
static int l, r, disp;
register unsigned char *ch;
ch = RTable; /* Routing Table Root */
lensv = x121[0] & 0x0f;
i = 0; /* Start with first digit of DNIC */
r = -1;
do {
if (*ch != 0) r = *(ch+1);
if (*ch == 2) /* Modify Address and return */ {
adr_copy(0,NPAroute[r],0, x121); /* New Called */
return -1; /* need to re-route call */
}
if (i == lensv) break;
l = x121[ (i>>1) +1 ];
if (!(i&1)) /* High */ l = l>>4;
i++;
disp = *(ch+2+(l&0x0f));
ch += (disp*12); /* Advance to next record */
} while (disp != 0);
if (r == -1) return 0; /* No known route */
*ptr = &NPAroute[r][0];
return 1;
}