//==========================================================================
//
//      snmp/snmpagent/current/src/mibgroup/mibII/tcp.c
//
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//####UCDSNMPCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from the UCD-SNMP
// project,  <http://ucd-snmp.ucdavis.edu/>  from the University of
// California at Davis, which was originally based on the Carnegie Mellon
// University SNMP implementation.  Portions of this software are therefore
// covered by the appropriate copyright disclaimers included herein.
//
// The release used was version 4.1.2 of May 2000.  "ucd-snmp-4.1.2"
// -------------------------------------------
//
//####UCDSNMPCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    hmt
// Contributors: hmt
// Date:         2000-05-30
// Purpose:      Port of UCD-SNMP distribution to eCos.
// Description:  
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================
/********************************************************************
       Copyright 1989, 1991, 1992 by Carnegie Mellon University
 
                          Derivative Work -
Copyright 1996, 1998, 1999, 2000 The Regents of the University of California
 
                         All Rights Reserved
 
Permission to use, copy, modify and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appears in all copies and
that both that copyright notice and this permission notice appear in
supporting documentation, and that the name of CMU and The Regents of
the University of California not be used in advertising or publicity
pertaining to distribution of the software without specific written
permission.
 
CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL CMU OR
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*********************************************************************/
/* This file was generated by mib2c and is intended for use as a mib module
   for the ucd-snmp snmpd agent. */


/* This should always be included first before anything else */
#include <config.h>


/* minimal include directives */
#include "mibincl.h"
#include "mibgroup/util_funcs.h"
#include "mibgroup/mibII/tcp.h"

#include <sys/protosw.h>

#define _KERNEL
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
//#define	TCPOUTFLAGS
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_debug.h>

/* 
 * tcp_variables_oid:
 *   this is the top level oid that we want to register under.  This
 *   is essentially a prefix, with the suffix appearing in the
 *   variable below.
 */


oid tcp_variables_oid[] = { 1,3,6,1,2,1,6 };


/* 
 * variable4 tcp_variables:
 *   this variable defines function callbacks and type return information 
 *   for the tcp mib section 
 */


struct variable4 tcp_variables[] = {
/*  magic number        , variable type , ro/rw , callback fn  , L, oidsuffix */
#define   TCPRTOALGORITHM       1
  { TCPRTOALGORITHM     , ASN_INTEGER   , RONLY , var_tcp, 1, { 1 } },
#define   TCPRTOMIN             2
  { TCPRTOMIN           , ASN_INTEGER   , RONLY , var_tcp, 1, { 2 } },
#define   TCPRTOMAX             3
  { TCPRTOMAX           , ASN_INTEGER   , RONLY , var_tcp, 1, { 3 } },
#define   TCPMAXCONN            4
  { TCPMAXCONN          , ASN_INTEGER   , RONLY , var_tcp, 1, { 4 } },
#define   TCPACTIVEOPENS        5
  { TCPACTIVEOPENS      , ASN_COUNTER   , RONLY , var_tcp, 1, { 5 } },
#define   TCPPASSIVEOPENS       6
  { TCPPASSIVEOPENS     , ASN_COUNTER   , RONLY , var_tcp, 1, { 6 } },
#define   TCPATTEMPTFAILS       7
  { TCPATTEMPTFAILS     , ASN_COUNTER   , RONLY , var_tcp, 1, { 7 } },
#define   TCPESTABRESETS        8
  { TCPESTABRESETS      , ASN_COUNTER   , RONLY , var_tcp, 1, { 8 } },
#define   TCPCURRESTAB          9
  { TCPCURRESTAB        , ASN_GAUGE     , RONLY , var_tcp, 1, { 9 } },
#define   TCPINSEGS             10
  { TCPINSEGS           , ASN_COUNTER   , RONLY , var_tcp, 1, { 10 } },
#define   TCPOUTSEGS            11
  { TCPOUTSEGS          , ASN_COUNTER   , RONLY , var_tcp, 1, { 11 } },
#define   TCPRETRANSSEGS        12
  { TCPRETRANSSEGS      , ASN_COUNTER   , RONLY , var_tcp, 1, { 12 } },
#define   TCPCONNSTATE          15
  { TCPCONNSTATE        , ASN_INTEGER   , RWRITE, var_tcpConnTable, 3, { 13,1,1 } },
#define   TCPCONNLOCALADDRESS   16
  { TCPCONNLOCALADDRESS , ASN_IPADDRESS , RONLY , var_tcpConnTable, 3, { 13,1,2 } },
#define   TCPCONNLOCALPORT      17
  { TCPCONNLOCALPORT    , ASN_INTEGER   , RONLY , var_tcpConnTable, 3, { 13,1,3 } },
#define   TCPCONNREMADDRESS     18
  { TCPCONNREMADDRESS   , ASN_IPADDRESS , RONLY , var_tcpConnTable, 3, { 13,1,4 } },
#define   TCPCONNREMPORT        19
  { TCPCONNREMPORT      , ASN_INTEGER   , RONLY , var_tcpConnTable, 3, { 13,1,5 } },
#define   TCPINERRS             20
  { TCPINERRS           , ASN_COUNTER   , RONLY , var_tcp, 1, { 14 } },
#define   TCPOUTRSTS            21
  { TCPOUTRSTS          , ASN_COUNTER   , RONLY , var_tcp, 1, { 15 } },
//#define   IPV6TCPCONNSTATE      29
//  { IPV6TCPCONNSTATE    , ASN_INTEGER   , RWRITE, var_ipv6TcpConnTable, 3, { 16,1,6 } },

};
/*    (L = length of the oidsuffix) */


/*
 * init_tcp():
 *   Initialization routine.  This is called when the agent starts up.
 *   At a minimum, registration of your variables should take place here.
 */
void init_tcp(void) {


  /* register ourselves with the agent to handle our mib tree */
  REGISTER_MIB("tcp", tcp_variables, variable4,
               tcp_variables_oid);


  /* place any other initialization junk you need here */
}


/*
 * var_tcp():
 *   This function is called every time the agent gets a request for
 *   a scalar variable that might be found within your mib section
 *   registered above.  It is up to you to do the right thing and
 *   return the correct value.
 *     You should also correct the value of "var_len" if necessary.
 *
 *   Please see the documentation for more information about writing
 *   module extensions, and check out the examples in the examples
 *   and mibII directories.
 */
unsigned char *
var_tcp(struct variable *vp, 
                oid     *name, 
                size_t  *length, 
                int     exact, 
                size_t  *var_len, 
                WriteMethod **write_method)
{
    static long long_ret;

    if (header_generic(vp,name,length,exact,var_len,write_method)
        == MATCH_FAILED )
        return NULL;

    switch(vp->magic) {

    case TCPRTOALGORITHM:
        long_ret = 1; // meaning "other"
        return (unsigned char *) &long_ret;

    case TCPRTOMIN:
        long_ret = TCPTV_MIN / PR_SLOWHZ * 1000;;
        return (unsigned char *) &long_ret;

    case TCPRTOMAX:
        long_ret = TCPTV_REXMTMAX / PR_SLOWHZ * 1000;;
        return (unsigned char *) &long_ret;

    case TCPMAXCONN:
        long_ret = -1; // It is dynamic.
        return (unsigned char *) &long_ret;

    case TCPACTIVEOPENS:
        long_ret = tcpstat.tcps_connattempt;
        return (unsigned char *) &long_ret;

    case TCPPASSIVEOPENS:
        long_ret = tcpstat.tcps_accepts;
        return (unsigned char *) &long_ret;

    case TCPATTEMPTFAILS:
        long_ret = tcpstat.tcps_conndrops;
        return (unsigned char *) &long_ret;

    case TCPESTABRESETS:
        long_ret = tcpstat.tcps_drops;
        return (unsigned char *) &long_ret;

    case TCPCURRESTAB: {
        struct inpcb *inp;
        long_ret = 0;
        for (inp = tcbtable.inpt_queue.cqh_first;
             inp != (struct inpcb *)&tcbtable.inpt_queue;
             inp = inp->inp_queue.cqe_next) {
            struct tcpcb *tp = intotcpcb( inp );
            if ( tp && (TCPS_ESTABLISHED == tp->t_state ||
                        TCPS_CLOSE_WAIT  == tp->t_state) )
                long_ret++;
        }
        return (unsigned char *) &long_ret;
    }

    case TCPINSEGS:
        long_ret = tcpstat.tcps_rcvtotal;
        return (unsigned char *) &long_ret;

    case TCPOUTSEGS:
        long_ret = tcpstat.tcps_sndtotal - tcpstat.tcps_sndrexmitpack;
        if ( long_ret < 0 )
            long_ret = 0;
        return (unsigned char *) &long_ret;

    case TCPRETRANSSEGS:
        long_ret = tcpstat.tcps_sndrexmitpack;
        return (unsigned char *) &long_ret;

    case TCPINERRS:
        long_ret = tcpstat.tcps_rcvbadsum
            + tcpstat.tcps_rcvbadoff
            + tcpstat.tcps_rcvshort
            + tcpstat.tcps_rcvmemdrop; // Is that last one an input error?
        return (unsigned char *) &long_ret;

    case TCPOUTRSTS:
        long_ret = tcpstat.tcps_sndctrl - tcpstat.tcps_closed;
        if ( long_ret < 0 )
            long_ret = 0;
        return (unsigned char *) &long_ret;

    default:
      ERROR_MSG("");
  }
  return NULL;
}




/*
 * var_tcpConnTable():
 *   Handle this table separately from the scalar value case.
 *   The workings of this are basically the same as for var_tcpConnTable above.
 */
unsigned char *
var_tcpConnTable(struct variable *vp,
    	    oid     *name,
    	    size_t  *length,
    	    int     exact,
    	    size_t  *var_len,
    	    WriteMethod **write_method)
{
    static long long_ret;
    static unsigned char string[SPRINT_MAX_LEN];
    register struct inpcb *inp;
    register struct inpcb *low_inp = NULL;
    oid                    lowest[24];
    oid                    newname[24];
    u_char		   *cp;
    oid			   *op;
    struct tcpcb *tp;

    // This is indexed by local-address, local-port, remote-address, remport
    // at 1,3,6,1,2,1,6,13,1
    // so we get 1,3,6,1,2,1,6,13,1,?,A,B,C,D,lport,P,Q,R,S,rport
    // initial length is 10, out-length is 20,
    // Local address is offsets 10-13, port is offset 14.
    // Remote address is offsets 15-18, port is offset 19.
    
    // starting from udbtable, look in
    //      low_pcb->inp_laddr.s_addr
    // and  low_pcb->inp_lport
    // /_l/_f/ for foreign port,address.

    /* fill in object part of name for current (less sizeof instance part) */
    memcpy((char *)newname, (char *)vp->name, (int)vp->namelen * sizeof(oid));

    for (inp = tcbtable.inpt_queue.cqh_first;
         inp != (struct inpcb *)&tcbtable.inpt_queue;
         inp = inp->inp_queue.cqe_next) {

        cp = (u_char *)&inp->inp_laddr.s_addr;
        op = newname + 10;
        *op++ = *cp++;
        *op++ = *cp++;
        *op++ = *cp++;
        *op++ = *cp++;
        
        newname[14] = ntohs(inp->inp_lport);

        cp = (u_char *)&inp->inp_faddr.s_addr;
        op = newname + 15;
        *op++ = *cp++;
        *op++ = *cp++;
        *op++ = *cp++;
        *op++ = *cp++;
        
        newname[19] = ntohs(inp->inp_fport);

        if (exact){
            if (snmp_oid_compare(newname, 20, name, *length) == 0){
                memcpy( (char *)lowest,(char *)newname, 20 * sizeof(oid));
                low_inp = inp;
                break;  /* no need to search further */
            }
        } else {
            if ((snmp_oid_compare(newname, 20, name, *length) > 0) &&
                (!low_inp || (snmp_oid_compare(newname, 20, lowest, 20) < 0))){
                /*
                 * if new one is greater than input and closer to input than
                 * previous lowest, save this one as the "next" one.
                 */
                memcpy( (char *)lowest,(char *)newname, 20 * sizeof(oid));
                low_inp = inp;
            }
        }
    }

    if ( ! low_inp )
        return NULL;

    tp = intotcpcb( low_inp );
    if ( ! tp )
        return NULL; // Shouldn't happen

    memcpy( (char *)name,(char *)lowest, 20 * sizeof(oid));
    *length = 20;
    *var_len = sizeof( long_ret );
    *write_method = 0;
    
    switch(vp->magic) {
    case TCPCONNSTATE:
        // NOTSUPPORTED: *write_method = write_tcpConnState;
        switch ( tp->t_state ) {
        case TCPS_CLOSED	: // 0	/* closed */
            long_ret = 1; break;
        case TCPS_LISTEN	: // 1	/* listening for connection */
            long_ret = 2; break;
        case TCPS_SYN_SENT	: // 2	/* active, have sent syn */
            long_ret = 3; break;
        case TCPS_SYN_RECEIVED	: // 3	/* have sent and received syn */
            long_ret = 4; break;
        case TCPS_ESTABLISHED	: // 4	/* established */
            long_ret = 5; break;
        case TCPS_CLOSE_WAIT	: // 5	/* rcvd fin, waiting for close */
            long_ret = 8; break;
        case TCPS_FIN_WAIT_1	: // 6	/* have closed, sent fin */
            long_ret = 6; break;
        case TCPS_CLOSING	: // 7	/* closed xchd FIN; await ACK */
            long_ret = 10; break;
        case TCPS_LAST_ACK	: // 8	/* had fin and close; await FIN ACK */
            long_ret = 9; break;
        case TCPS_FIN_WAIT_2	: // 9	/* have closed, fin is acked */
            long_ret = 7; break;
        case TCPS_TIME_WAIT	: // 10	/* in 2*msl quiet wait after close */
            long_ret = 11; break;
        default:
            long_ret = 1;
        }
        return (unsigned char *) &long_ret;

    case TCPCONNLOCALADDRESS:
        cp = (u_char *)&low_inp->inp_laddr.s_addr;
        string[0] = *cp++;
        string[1] = *cp++;
        string[2] = *cp++;
        string[3] = *cp++;
        *var_len = 4;
        return (unsigned char *) string;

    case TCPCONNLOCALPORT:
        long_ret = (long)ntohs(low_inp->inp_lport);
        return (unsigned char *) &long_ret;

    case TCPCONNREMADDRESS:
        cp = (u_char *)&low_inp->inp_faddr.s_addr;
        string[0] = *cp++;
        string[1] = *cp++;
        string[2] = *cp++;
        string[3] = *cp++;
        *var_len = 4;
        return (unsigned char *) string;

    case TCPCONNREMPORT:
        long_ret = (long)ntohs(low_inp->inp_fport);
        return (unsigned char *) &long_ret;

    default:
        ERROR_MSG("");
    }
    return NULL;
}


#if 0 // NOTSUPPORTED:
int
write_tcpConnState(int      action,
            u_char   *var_val,
            u_char   var_val_type,
            size_t   var_val_len,
            u_char   *statP,
            oid      *name,
            size_t   name_len)
{
  static long *long_ret;
  int size;


  switch ( action ) {
        case RESERVE1:
          if (var_val_type != ASN_INTEGER){
              fprintf(stderr, "write to tcpConnState not ASN_INTEGER\n");
              return SNMP_ERR_WRONGTYPE;
          }
          if (var_val_len > sizeof(long_ret)){
              fprintf(stderr,"write to tcpConnState: bad length\n");
              return SNMP_ERR_WRONGLENGTH;
          }
          break;


        case RESERVE2:
          size = var_val_len;
          long_ret = (long *) var_val;


          break;


        case FREE:
             /* Release any resources that have been allocated */
          break;


        case ACTION:
             /* The variable has been stored in long_ret for
             you to use, and you have just been asked to do something with
             it.  Note that anything done here must be reversable in the UNDO case */
          break;


        case UNDO:
             /* Back out any changes made in the ACTION case */
          break;


        case COMMIT:
             /* Things are working well, so it's now safe to make the change
             permanently.  Make sure that anything done here can't fail! */
          break;
  }
  return SNMP_ERR_NOERROR;
}

#endif




#if 0 // NOTSUPPORTED:
/*
 * var_ipv6TcpConnTable():
 *   Handle this table separately from the scalar value case.
 *   The workings of this are basically the same as for var_tcp above.
 */
unsigned char *
var_ipv6TcpConnTable(struct variable *vp,
    	    oid     *name,
    	    size_t  *length,
    	    int     exact,
    	    size_t  *var_len,
    	    WriteMethod **write_method)
{


  /* variables we may use later */
  static long long_ret;
  static unsigned char string[SPRINT_MAX_LEN];
  static oid objid[MAX_OID_LEN];
  static struct counter64 c64;


  /* 
   * This assumes that the table is a 'simple' table.
   *	See the implementation documentation for the meaning of this.
   *	You will need to provide the correct value for the TABLE_SIZE parameter
   *
   * If this table does not meet the requirements for a simple table,
   *	you will need to provide the replacement code yourself.
   *	Mib2c is not smart enough to write this for you.
   *    Again, see the implementation documentation for what is required.
   */
//  if (header_simple_table(vp,name,length,exact,var_len,write_method,
//                          IPV6TCPCONNTABLE_TABLE_SIZE)
//                                                == MATCH_FAILED )
    return NULL;


  /* 
   * this is where we do the value assignments for the mib results.
   */
  switch(vp->magic) {


    case IPV6TCPCONNSTATE:
        *write_method = write_ipv6TcpConnState;
        long_ret = 0;
        return (unsigned char *) &long_ret;


    default:
      ERROR_MSG("");
  }
  return NULL;
}




int
write_ipv6TcpConnState(int      action,
            u_char   *var_val,
            u_char   var_val_type,
            size_t   var_val_len,
            u_char   *statP,
            oid      *name,
            size_t   name_len)
{
  static long *long_ret;
  int size;


  switch ( action ) {
        case RESERVE1:
          if (var_val_type != ASN_INTEGER){
              fprintf(stderr, "write to tcpConnState not ASN_INTEGER\n");
              return SNMP_ERR_WRONGTYPE;
          }
          if (var_val_len > sizeof(long_ret)){
              fprintf(stderr,"write to tcpConnState: bad length\n");
              return SNMP_ERR_WRONGLENGTH;
          }
          break;


        case RESERVE2:
          size = var_val_len;
          long_ret = (long *) var_val;


          break;


        case FREE:
             /* Release any resources that have been allocated */
          break;


        case ACTION:
             /* The variable has been stored in long_ret for
             you to use, and you have just been asked to do something with
             it.  Note that anything done here must be reversable in the UNDO case */
          break;


        case UNDO:
             /* Back out any changes made in the ACTION case */
          break;


        case COMMIT:
             /* Things are working well, so it's now safe to make the change
             permanently.  Make sure that anything done here can't fail! */
          break;
  }
  return SNMP_ERR_NOERROR;
}

#endif // NOTSUPPORTED: ipv6

// EOF tcp.c
