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Annotation of kernel/bsd/netat/ddp_sip.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: 
        !            26: /*
        !            27:  *     Copyright (c) 1988, 1989 Apple Computer, Inc. 
        !            28:  *
        !            29:  *     The information contained herein is subject to change without
        !            30:  *     notice and  should not be  construed as a commitment by Apple
        !            31:  *     Computer, Inc. Apple Computer, Inc. assumes no responsibility
        !            32:  *     for any errors that may appear.
        !            33:  *
        !            34:  *     Confidential and Proprietary to Apple Computer, Inc.
        !            35:  *   Modified, March 17, 1997 by Tuyen Nguyen for Rhapsody.
        !            36:  */
        !            37: 
        !            38: /****************************************************************/
        !            39: /*                                                             */
        !            40: /*                                                             */
        !            41: /*                             S I P                           */
        !            42: /*                     System Information Protocol             */
        !            43: /*                                                             */
        !            44: /*                                                             */
        !            45: /****************************************************************/
        !            46: 
        !            47: /* System Information Protocol -- implemented to handle Responder
        !            48:  * Queries.  The queries are ATP requests, but the ATP responses are faked
        !            49:  * here in a DDP level handler routine.  The responder socket is always
        !            50:  * the 1st socket in the dynamic socket range (128) and it is assumed
        !            51:  * that the node will be registered on that socket.
        !            52:  * 
        !            53:  * In A/UX implementation, this implies that /etc/appletalk program will
        !            54:  * register the node name on socket DDP_SOCKET_1st_DYNAMIC (128).
        !            55:  */
        !            56: 
        !            57: #include <sysglue.h>
        !            58: 
        !            59: #include <at/appletalk.h>
        !            60: #include <lap.h>
        !            61: #include <at/ddp.h>
        !            62: #include <at/atp.h>
        !            63: 
        !            64: #include <at/at_lap.h>
        !            65: #include <at_ddp.h>
        !            66: 
        !            67: #define        SIP_SYSINFO_CMD         1
        !            68: #define        SIP_DATALINK_CMD        6
        !            69: 
        !            70: #define        SIP_GOOD_RESPONSE       0x1
        !            71: #define        SIP_BAD_RESPONSE        0xff
        !            72: 
        !            73: #define        SIP_DRIVER_VERSION      0x0001
        !            74: #define        SIP_RESPONDER_VERSION   0x0001
        !            75: 
        !            76: typedef        struct {
        !            77:        u_char  response;
        !            78:        u_char  unused;
        !            79:        u_short responder_version;
        !            80: } sip_userbytes_t;
        !            81: 
        !            82: static void
        !            83: sip_input(mp, ifID)
        !            84: gbuf_t *mp;
        !            85: at_if_t         ifID; /* not used */
        !            86: {
        !            87:        /* Packets arriving here are actually ATP packets, but since
        !            88:         * A/UX only send dummy responses, we're implementing responder as
        !            89:         * a DDP handler
        !            90:         */
        !            91:        register at_ddp_t       *ddp;
        !            92:        register at_atp_t       *atp;
        !            93:        register gbuf_t         *tmp;
        !            94:        u_char          *resp;
        !            95:        sip_userbytes_t ubytes;
        !            96: 
        !            97:        ddp = (at_ddp_t *)gbuf_rptr(mp);
        !            98: 
        !            99:        /* Make sure the packet we got is an ATP packet */
        !           100:        if (ddp->type != ATP_DDP_TYPE) {
        !           101:                gbuf_freem(mp);
        !           102:                return;
        !           103:        }
        !           104:        
        !           105:        /* assuming that the whole packet is in one contiguous buffer */
        !           106:        atp = (at_atp_t *)ddp->data;
        !           107:        
        !           108:        switch(UAL_VALUE(atp->user_bytes)) {
        !           109:        case SIP_SYSINFO_CMD :
        !           110:                /* Sending a response with "AppleTalk driver version" (u_short)
        !           111:                 * followed by 14 zeros will pacify the interpoll.
        !           112:                 * What?  You don't understand what it means to send 14 zeroes?
        !           113:                 * Tsk, tsk, look up SIP protocol specs for details!!
        !           114:                 */
        !           115:                if ((tmp = (gbuf_t *)ddp_growmsg(mp, 16)) == NULL) {
        !           116:                        /* dont have buffers */
        !           117:                        gbuf_freem(mp);
        !           118:                        return;
        !           119:                }
        !           120:                if (tmp == mp) 
        !           121:                        /* extra space allocated on the same buffer block */
        !           122:                        resp = atp->data;
        !           123:                else
        !           124:                        resp = (u_char *)gbuf_rptr(tmp);
        !           125:                bzero(resp, 16);
        !           126:                *(u_short *)resp = SIP_DRIVER_VERSION;
        !           127: 
        !           128:                ubytes.response = SIP_GOOD_RESPONSE;
        !           129:                ubytes.unused = 0;
        !           130:                ubytes.responder_version = SIP_RESPONDER_VERSION;
        !           131:                break;
        !           132:        case SIP_DATALINK_CMD :
        !           133:                /* In this case, the magic spell is to send 2 zeroes after
        !           134:                 * the "AppleTalk driver version".
        !           135:                 */
        !           136:                if ((tmp = (gbuf_t *)ddp_growmsg(mp, 4)) == NULL) {
        !           137:                        /* dont have buffers */
        !           138:                        gbuf_freem(mp);
        !           139:                        return;
        !           140:                }
        !           141:                if (tmp == mp) 
        !           142:                        /* extra space allocated on the same buffer block */
        !           143:                        resp = atp->data;
        !           144:                else
        !           145:                        resp = (u_char *)gbuf_rptr(tmp);
        !           146:                bzero(resp, 16);
        !           147:                *(u_short *)resp = SIP_DRIVER_VERSION;
        !           148: 
        !           149:                ubytes.response = SIP_GOOD_RESPONSE;
        !           150:                ubytes.unused = 0;
        !           151:                ubytes.responder_version = SIP_RESPONDER_VERSION;
        !           152:                break;
        !           153:        default :
        !           154:                /* bad request, send a bad command response back */
        !           155:                ubytes.response = SIP_BAD_RESPONSE;
        !           156:                ubytes.unused = 0;
        !           157:                ubytes.responder_version = SIP_RESPONDER_VERSION;
        !           158:        }
        !           159: 
        !           160:        NET_NET(ddp->dst_net, ddp->src_net);
        !           161:        ddp->dst_node = ddp->src_node;
        !           162:        ddp->dst_socket = ddp->src_socket;
        !           163:        bcopy((caddr_t) &ubytes, (caddr_t) atp->user_bytes, sizeof(ubytes));
        !           164:        atp->cmd = ATP_CMD_TRESP;
        !           165:        atp->eom = 1;
        !           166:        atp->sts = 0;
        !           167:        atp->bitmap = 0;
        !           168: 
        !           169:        if (ddp_output(&mp, DDP_SOCKET_1st_DYNAMIC, NULL) != 0)
        !           170:                gbuf_freem(mp);
        !           171: 
        !           172:        return;
        !           173: }
        !           174: 
        !           175: 
        !           176: void   sip_init()
        !           177: {
        !           178:        /* Open a "well known" dynamic socket with sip_input as the handler
        !           179:         * routine.  
        !           180:         */
        !           181:        ddp_socket_t    socket;
        !           182: 
        !           183: 
        !           184:        socket.number = DDP_SOCKET_1st_DYNAMIC;
        !           185:        socket.flags = DDP_CALL_HANDLER;
        !           186:        socket.sock_u.handler = sip_input;
        !           187:        socket.dev = NULL;
        !           188: 
        !           189:        ddp_bind_socket(&socket);
        !           190:        return;
        !           191: }      

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