---

TclAuthorizer.cpp

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/*
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                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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 Everyone is permitted to copy and distribute verbatim copies
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*/
static const char* Copyright = "(C) Copyright Michigan State University 2002, All rights reserved";// Class: CTclAuthorizer
// Manages authentication for the TclServer component.
//
// Author:
//    Ron Fox
//    NSCL
//    Michigan State University
//    East Lansing, MI 48824-1321
//
//
#include "TclAuthorizer.h"                              
#include "TCLString.h"

#include <string.h>
#include <assert.h>
#include <algorithm>

#ifndef WIN32
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif

#include <stdio.h>

#ifdef WIN32
#include <winsock.h>
#define uint32_t    unsigned long
#define uint8_t     unsigned char
#endif

static char* pCopyrightNotice = 
"(C) Copyright 1999 NSCL, All rights reserved TclAuthorizer.cpp \n";

// Functions for class CTclAuthorizer

static const std::string NameVariable("ServerHostNames");
static const std::string IPVariable("ServerHostIps");


//
//  Function:
//     CTclAuthorizer (Tcl_Interp* pInterp)
//  Operation Type:
//     Constructor.
//
CTclAuthorizer::CTclAuthorizer(Tcl_Interp* pInterp) :
  CDAQTCLProcessor("serverauth", 
                   m_pInterpreter = new CTCLInterpreter(pInterp)),
  m_pResult(0)
{
  m_pHostNames = new CTCLVariable(m_pInterpreter, NameVariable, kfFALSE);
  m_pHostIps   = new CTCLVariable(m_pInterpreter, IPVariable, kfFALSE);
  Register();
}
//
//  Function:       
//     operator()(CTCLInterpreter& rInterp, CTCLResult& rResult,
//                int nArgs, char* pArgs[])
//  Operation Type: 
//     Behavioral override.
int CTclAuthorizer::operator()(CTCLInterpreter& rInterp, CTCLResult& rResult, 
                               int nArgs, char* pArgs[])
{
  m_pResult = &rResult;
  int         retval = Process(rInterp, rResult, nArgs, pArgs);
  m_pResult = (CTCLResult*)kpNULL;
  return retval;
}
int CTclAuthorizer::Process(CTCLInterpreter& rInterp, CTCLResult& rResult, 
                               int nArgs, char* pArgs[])  
{
  // Processes the serverauth command.
  //  This command has the forms:
  //
  //   serverauth add hostorip          ;# Allows host or IP address
  //   serverauth remove hostorip    ;# Disallows host or IP address
  //   serverauth list                         ;# Lists the authorized set.
  //
  nArgs--; pArgs++;
  if(nArgs < 1) {
    return Usage(rResult);
  }
  if(strcmp("add", pArgs[0]) == 0) {
    nArgs--;
    pArgs++;
    if(nArgs != 1) {
      return Usage(rResult);
    }
    return AddHost(std::string(pArgs[0])) ? TCL_OK : TCL_ERROR;
  }
  else if (strcmp("remove", pArgs[0]) == 0) {
    nArgs--;
    pArgs++;
    if(nArgs != 1) {
      return Usage(rResult);
    }
    return RemoveHost(std::string(pArgs[0])) ? TCL_OK : TCL_ERROR;
  }
  else if (strcmp("list", pArgs[0]) == 0) {
    nArgs--;
    pArgs++;
    if(nArgs != 0) {
      return Usage(rResult);
    }
    rResult = ListHosts();
    return TCL_OK;
  }
  else {
    return Usage(rResult);
  }
  rResult = std::string("Bug in CTclAuthorizer::operator() decode section");
  return TCL_ERROR;
  
}
//
//  Function:       
//     AddHost(const string& HostOrIp)
//  Operation Type: 
//     
Bool_t CTclAuthorizer::AddHost( const std::string& HostOrIp)  
{
  // Adds a specified host to the access lists.
  // The parameter is first analyzed as a host name.
  //  if the resolver can get an IP for it the host and
  //  ip are entered in the lists.  If not, the
  //  parameter is analyzed as a dotted IP address
  //  If it can be parsed in that way, the IP address
  //  is entered along with a hostname of >unresolved<
  //
  
  // First: Duplicates are not allowed:

  if(GetIndex(HostOrIp) >= 0) { // Duplicate...
    setResult("Duplicate host or ip address");
    return kfFALSE;
  }
  std::string hostname, hostip;
  if(!ConvertHost(HostOrIp, hostname, hostip)) {
    setResult("Invalid host or IP address");
    return kfFALSE;
  }
  // Append the hostname and hostip to the list:
  //
  StringArray hosts;
  StringArray ips;
  CTCLList HostList(m_pInterpreter,std::string(""));
  CTCLList IpList(m_pInterpreter,std::string(""));

  if(m_pHostNames->Get(TCL_GLOBAL_ONLY | TCL_LEAVE_ERR_MSG)) {
    CTCLList     HostList(m_pInterpreter, 
                          m_pHostNames->Get(TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY));
    HostList.Split(hosts);
    
    CTCLList     IpList(m_pInterpreter, 
                        m_pHostIps->Get(TCL_GLOBAL_ONLY | TCL_LEAVE_ERR_MSG));
    IpList.Split(ips);
  }
  hosts.push_back(hostname);
  ips.push_back(hostip);

  m_pHostNames->Set(HostList.Merge(hosts), TCL_LEAVE_ERR_MSG |TCL_GLOBAL_ONLY);
  m_pHostIps->Set(IpList.Merge(ips), TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY);
  
  return kfTRUE;
  
}
//
//  Function:       
//     RemoveHost(const string& NameOrIP)
//  Operation Type: 
//     
Bool_t CTclAuthorizer::RemoveHost(const std::string& NameOrIp)  
{
  // An attempt is made to locate the host in 
  // the name list.  If it is found it and the 
  // like indexed item in the ip address list are
  // removed.  
  //  If the name is not found, it is treated like
  // an IP address, and searched for in the IP address
  // list.  If found, it and the corresponding name entry are
  // removed.
  //
  
  Int_t idx = GetIndex(NameOrIp);
  if(idx < 0) {                 // Not in the table:
    setResult("Host or IP address is not in the authorization list");
    return kfFALSE;
  }
  StringArray hostnames;
  CTCLList    HostList(m_pInterpreter, 
                       m_pHostNames->Get(TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY));
  HostList.Split(hostnames);

  StringArray hostips;
  CTCLList    IpList(m_pInterpreter, 
                     m_pHostIps->Get(TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY));
  IpList.Split(hostips);

  int nLast = hostnames.size() - 1; // Index of last item.
 
  // The delete is done by copying the last entry into the
  // entry the which is to be deleted and doing a pop_back() to kill off
  // the last entry:

  hostnames[idx] = hostnames[nLast];
  hostips[idx]   = hostips[nLast];
  hostnames.pop_back();
  hostips.pop_back();
  m_pHostIps->Set(IpList.Merge(hostips), TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY);
  m_pHostNames->Set(HostList.Merge(hostnames),
                    TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY);

  return kfTRUE;
  
}
//
//  Function:       
//     ListHosts()
//  Operation Type: 
//     
std::string CTclAuthorizer::ListHosts()  
{
  // Returns a TCL formatted list whose elements are two entry
  // lists containing {hostname ipaddress}
  // Note that if the IP address is not resolvable,
  // the name has no real meaning.
  //

  CTCLString Result;

  // The result list is built up in Result and then returned.
  // This cannot fail.

  StringArray hostnames;
  CTCLList    HostList(m_pInterpreter, 
                       m_pHostNames->Get(TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY));
  HostList.Split(hostnames);

  StringArray hostips;
  CTCLList    IpList(m_pInterpreter, 
                     m_pHostIps->Get(TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY));
  IpList.Split(hostips);

  assert(hostips.size() == hostnames.size());

  for(int i=0; i < hostips.size(); i++) {
    Result.StartSublist();
    Result.AppendElement(hostnames[i]);
    Result.AppendElement(hostips[i]);
    Result.EndSublist();
  }
  std::string sResult = Result;
  return sResult;
  
}
//
//  Function:       
//     Authenticate(const string& rNameOrIp)
//  Operation Type: 
//     
Bool_t CTclAuthorizer::Authenticate(const std::string& rNameOrIp)  
{
  // The parameter is converted to canonical ip form
  // and searched for in the ip list.
  //


  int idx = GetIndex(rNameOrIp);
  return (idx >= 0);
  
}
//
//  Function:       
//     HostToIp(string& rName)
//  Operation Type: 
//     
Bool_t CTclAuthorizer::HostToIp(std::string& rName)  
{
  // Converts a string to IP address in 'canonical dotted' form
  // Cannonical dotted form is:  %03d.%03d.%03d.%03d
  // If the input is a host name, it is converted to ip address via
  // the resolver.  If not it is decoded as a dotted ip address
  // and canonicalized.
  //   Result is returned in the parameter.  Return value indicates
  // success or failure.. Input is not 'harmed' on False return.
  //
  

  struct in_addr IpAddress;
  char Result[100];

  // First the string is treated as a hostname for the resolver to
  // turn into an IP address:

  struct hostent* pHostInfo = gethostbyname(rName.c_str());
  if(! pHostInfo) {             // Try as dotted ip
    IpAddress.s_addr = inet_addr(rName.c_str());
  }
  else {
    memcpy(&IpAddress, pHostInfo->h_addr,4);
  }
  union {
    uint32_t along;
    uint8_t  bytes[4];
  } IpMyOrder;
  IpMyOrder.along = ntohl(IpAddress.s_addr);
  sprintf(Result, "%03d.%03d.%03d.%03d",
          IpMyOrder.bytes[3], IpMyOrder.bytes[2],
          IpMyOrder.bytes[1], IpMyOrder.bytes[0]);

  std::string R(Result);
  rName = R;
  return kfTRUE;

}

//
//  Function:       
//     GetIndex(const string& rHostOrIp)
//  Operation Type: 
//     
Int_t CTclAuthorizer::GetIndex(const std::string& rHostOrIp)  
{
  // Returns the index of the entry corresponding
  // to an input IP name or Address or -1 if no match.
  // This utility contains common code between 
  // Add, Delete and Authenticate.

  std::string Host(rHostOrIp);
  if(!HostToIp(Host)) return -1; // Invalid host.
  if(!m_pHostIps->Get(TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY)) return -1;


  CTCLList IpList(m_pInterpreter, 
                  m_pHostIps->Get(TCL_LEAVE_ERR_MSG | TCL_GLOBAL_ONLY));
  StringArray ipvector;
  IpList.Split(ipvector);
  for(int i = 0; i < ipvector.size(); i++) {
    if(ipvector[i] == Host) return i;
  }
  return -1;
}
//
// Function:
//   Bool_t ConvertHost(const string& rInName, 
//                      string& rOutname, string& rCanonicalIP)
// Operation type:
//   Utility:
//
Bool_t 
CTclAuthorizer::ConvertHost(const std::string& rInName, 
                                                        std::string& rOutname, 
                                                        std::string& rCanonicalIP)
{
  // Converts the input name into the information required to
  // insert it into the host access list.

  std::string myname(rInName);
  rCanonicalIP = rInName;
  if(!HostToIp(rCanonicalIP)) return kfFALSE;

  struct hostent* pEntry = gethostbyname(myname.c_str());
  rOutname = pEntry ? myname : std::string(">unresolved<");
  return kfTRUE;
}
//
// Function:
//   int Usage(CTCLResult& rResult)
// OPeration type:
//   Utility
//
int
CTclAuthorizer::Usage(CTCLResult& rResult)
{
  // Fills the result string with command usage information.
  // returns TCL_ERROR making calls like
  //  return Usage(rResult)
  // a useful simplification.

  rResult   = std::string("Usage:\n");
  rResult  += std::string("  serverauth add hostorip\n");
  rResult  += std::string("  serverauth remove hostorip\n");
  rResult  += std::string("  serverauth list\n");
  return TCL_ERROR;
}

---