/* 
 *  Unix SMB/CIFS implementation.
 *  RPC Pipe client / server routines for Dfs
 *  Copyright (C) Andrew Tridgell              1992-1997,
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-1997,
 *  Copyright (C) Shirish Kalele               2000.
 *  Copyright (C) Jeremy Allison				2001.
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* This is the implementation of the dfs pipe. */

#include "includes.h"
#include "nterr.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_RPC_SRV

#define MAX_MSDFS_JUNCTIONS 256

/* This function does not return a WERROR or NTSTATUS code but rather 1 if
   dfs exists, or 0 otherwise. */

uint32 _dfs_exist(pipes_struct *p, DFS_Q_DFS_EXIST *q_u, DFS_R_DFS_EXIST *r_u)
{
	if(lp_host_msdfs()) 
		return 1;
	else
		return 0;
}

WERROR _dfs_add(pipes_struct *p, DFS_Q_DFS_ADD* q_u, DFS_R_DFS_ADD *r_u)
{
  struct current_user user;
  struct junction_map jn;
  struct referral* old_referral_list = NULL;
  BOOL exists = False;

  pstring dfspath, servername, sharename;
  pstring altpath;

  get_current_user(&user,p);

  if (user.uid != 0) {
	DEBUG(10,("_dfs_add: uid != 0. Access denied.\n"));
	return WERR_ACCESS_DENIED;
  }

  unistr2_to_ascii(dfspath, &q_u->DfsEntryPath, sizeof(dfspath)-1);
  unistr2_to_ascii(servername, &q_u->ServerName, sizeof(servername)-1);
  unistr2_to_ascii(sharename, &q_u->ShareName, sizeof(sharename)-1);

  DEBUG(5,("init_reply_dfs_add: Request to add %s -> %s\\%s.\n",
	   dfspath, servername, sharename));

  pstrcpy(altpath, servername);
  pstrcat(altpath, "\\");
  pstrcat(altpath, sharename);

  if(get_referred_path(dfspath, &jn, NULL, NULL))
    {
      exists = True;
      jn.referral_count += 1;
      old_referral_list = jn.referral_list;
    }
  else
    jn.referral_count = 1;

  jn.referral_list = (struct referral*) talloc(p->mem_ctx, jn.referral_count 
					       * sizeof(struct referral));

  if(jn.referral_list == NULL)
    {
      DEBUG(0,("init_reply_dfs_add: talloc failed for referral list!\n"));
      return WERR_DFS_INTERNAL_ERROR;
    }

  if(old_referral_list)
    {
      memcpy(jn.referral_list, old_referral_list, 
	     sizeof(struct referral)*jn.referral_count-1);
      SAFE_FREE(old_referral_list);
    }
  
  jn.referral_list[jn.referral_count-1].proximity = 0;
  jn.referral_list[jn.referral_count-1].ttl = REFERRAL_TTL;

  pstrcpy(jn.referral_list[jn.referral_count-1].alternate_path, altpath);
  
  if(!create_msdfs_link(&jn, exists))
    return WERR_DFS_CANT_CREATE_JUNCT;

  return WERR_OK;
}

WERROR _dfs_remove(pipes_struct *p, DFS_Q_DFS_REMOVE *q_u, 
                   DFS_R_DFS_REMOVE *r_u)
{
  struct current_user user;
  struct junction_map jn;
  BOOL found = False;

  pstring dfspath, servername, sharename;
  pstring altpath;

  get_current_user(&user,p);

  if (user.uid != 0) {
	DEBUG(10,("_dfs_remove: uid != 0. Access denied.\n"));
	return WERR_ACCESS_DENIED;
  }

  unistr2_to_ascii(dfspath, &q_u->DfsEntryPath, sizeof(dfspath)-1);
  if(q_u->ptr_ServerName)
    unistr2_to_ascii(servername, &q_u->ServerName, sizeof(servername)-1);

  if(q_u->ptr_ShareName)
    unistr2_to_ascii(sharename, &q_u->ShareName, sizeof(sharename)-1);

  if(q_u->ptr_ServerName && q_u->ptr_ShareName)
    {
      pstrcpy(altpath, servername);
      pstrcat(altpath, "\\");
      pstrcat(altpath, sharename);
      strlower_m(altpath);
    }

  DEBUG(5,("init_reply_dfs_remove: Request to remove %s -> %s\\%s.\n",
	   dfspath, servername, sharename));

  if(!get_referred_path(dfspath, &jn, NULL, NULL))
	  return WERR_DFS_NO_SUCH_VOL;

  /* if no server-share pair given, remove the msdfs link completely */
  if(!q_u->ptr_ServerName && !q_u->ptr_ShareName)
    {
      if(!remove_msdfs_link(&jn))
	return WERR_DFS_NO_SUCH_VOL;
    }
  else
    {
      int i=0;
      /* compare each referral in the list with the one to remove */
      DEBUG(10,("altpath: .%s. refcnt: %d\n", altpath, jn.referral_count));
      for(i=0;i<jn.referral_count;i++)
	{
	  pstring refpath;
	  pstrcpy(refpath,jn.referral_list[i].alternate_path);
	  trim_string(refpath, "\\", "\\");
	  DEBUG(10,("_dfs_remove:  refpath: .%s.\n", refpath));
	  if(strequal(refpath, altpath))
	    {
	      *(jn.referral_list[i].alternate_path)='\0';
	      DEBUG(10,("_dfs_remove: Removal request matches referral %s\n",
			refpath));
	      found = True;
	    }
	}
      if(!found)
	return WERR_DFS_NO_SUCH_SHARE;
      
      /* Only one referral, remove it */
      if(jn.referral_count == 1)
	{
	  if(!remove_msdfs_link(&jn))
	    return WERR_DFS_NO_SUCH_VOL;
	}
      else
	{
	  if(!create_msdfs_link(&jn, True))
	    return WERR_DFS_CANT_CREATE_JUNCT;
	}
    }

  return WERR_OK;
}

static BOOL init_reply_dfs_info_1(struct junction_map* j, DFS_INFO_1* dfs1, int num_j)
{
  int i=0;
  for(i=0;i<num_j;i++) 
    {
      pstring str;
      dfs1[i].ptr_entrypath = 1;
      slprintf(str, sizeof(pstring)-1, "\\\\%s\\%s\\%s", global_myname(), 
	       j[i].service_name, j[i].volume_name);
      DEBUG(5,("init_reply_dfs_info_1: %d) initing entrypath: %s\n",i,str));
      init_unistr2(&dfs1[i].entrypath,str,strlen(str)+1);
    }
  return True;
}

static BOOL init_reply_dfs_info_2(struct junction_map* j, DFS_INFO_2* dfs2, int num_j)
{
  int i=0;
  for(i=0;i<num_j;i++)
    {
      pstring str;
      dfs2[i].ptr_entrypath = 1;
      slprintf(str, sizeof(pstring)-1, "\\\\%s\\%s\\%s", global_myname(),
	       j[i].service_name, j[i].volume_name);
      init_unistr2(&dfs2[i].entrypath, str, strlen(str)+1);
      dfs2[i].ptr_comment = 0;
      dfs2[i].state = 1; /* set up state of dfs junction as OK */
      dfs2[i].num_storages = j[i].referral_count;
    }
  return True;
}

static BOOL init_reply_dfs_info_3(TALLOC_CTX *ctx, struct junction_map* j, DFS_INFO_3* dfs3, int num_j)
{
  int i=0,ii=0;
  for(i=0;i<num_j;i++)
    {
      pstring str;
      dfs3[i].ptr_entrypath = 1;
      if (j[i].volume_name[0] == '\0')
	      slprintf(str, sizeof(pstring)-1, "\\\\%s\\%s",
		       global_myname(), j[i].service_name);
      else
	      slprintf(str, sizeof(pstring)-1, "\\\\%s\\%s\\%s", global_myname(),
		       j[i].service_name, j[i].volume_name);

      init_unistr2(&dfs3[i].entrypath, str, strlen(str)+1);
      dfs3[i].ptr_comment = 1;
      init_unistr2(&dfs3[i].comment, "", 1); 
      dfs3[i].state = 1;
      dfs3[i].num_storages = dfs3[i].num_storage_infos = j[i].referral_count;
      dfs3[i].ptr_storages = 1;
     
      /* also enumerate the storages */
      dfs3[i].storages = (DFS_STORAGE_INFO*) talloc(ctx, j[i].referral_count * 
						    sizeof(DFS_STORAGE_INFO));
      if (!dfs3[i].storages)
        return False;

      memset(dfs3[i].storages, '\0', j[i].referral_count * sizeof(DFS_STORAGE_INFO));

      for(ii=0;ii<j[i].referral_count;ii++)
	{
	  char* p; 
	  pstring path;
	  DFS_STORAGE_INFO* stor = &(dfs3[i].storages[ii]);
	  struct referral* ref = &(j[i].referral_list[ii]);
	  
	  pstrcpy(path, ref->alternate_path);
	  trim_string(path,"\\","");
	  p = strrchr_m(path,'\\');
	  if(p==NULL)
	    {
	      DEBUG(4,("init_reply_dfs_info_3: invalid path: no \\ found in %s\n",path));
	      continue;
	    }
	  *p = '\0';
	  DEBUG(5,("storage %d: %s.%s\n",ii,path,p+1));
	  stor->state = 2; /* set all storages as ONLINE */
	  init_unistr2(&stor->servername, path, strlen(path)+1);
	  init_unistr2(&stor->sharename,  p+1, strlen(p+1)+1);
	  stor->ptr_servername = stor->ptr_sharename = 1;
	}
    }
  return True;
}

static WERROR init_reply_dfs_ctr(TALLOC_CTX *ctx, uint32 level, 
                                   DFS_INFO_CTR* ctr, struct junction_map* jn,
                                   int num_jn)
{
  /* do the levels */
  switch(level)
    {
    case 1:
      {
	DFS_INFO_1* dfs1;
	dfs1 = (DFS_INFO_1*) talloc(ctx, num_jn * sizeof(DFS_INFO_1));
	if (!dfs1)
		return WERR_NOMEM;
	init_reply_dfs_info_1(jn, dfs1, num_jn);
	ctr->dfs.info1 = dfs1;
	break;
      }
    case 2:
      {
	DFS_INFO_2* dfs2;
	dfs2 = (DFS_INFO_2*) talloc(ctx, num_jn * sizeof(DFS_INFO_2));
	if (!dfs2)
		return WERR_NOMEM;
	init_reply_dfs_info_2(jn, dfs2, num_jn);
	ctr->dfs.info2 = dfs2;
	break;
      }
    case 3:
      {
	DFS_INFO_3* dfs3;
	dfs3 = (DFS_INFO_3*) talloc(ctx, num_jn * sizeof(DFS_INFO_3));
	if (!dfs3)
		return WERR_NOMEM;
	init_reply_dfs_info_3(ctx, jn, dfs3, num_jn);
	ctr->dfs.info3 = dfs3;
	break;
      }
	default:
		return WERR_INVALID_PARAM;
    }
  return WERR_OK;
}
      
WERROR _dfs_enum(pipes_struct *p, DFS_Q_DFS_ENUM *q_u, DFS_R_DFS_ENUM *r_u)
{
  uint32 level = q_u->level;
  struct junction_map jn[MAX_MSDFS_JUNCTIONS];
  int num_jn = 0;

  num_jn = enum_msdfs_links(jn);
  
  DEBUG(5,("make_reply_dfs_enum: %d junctions found in Dfs, doing level %d\n", num_jn, level));

  r_u->ptr_buffer = level;
  r_u->level = r_u->level2 = level;
  r_u->ptr_num_entries = r_u->ptr_num_entries2 = 1;
  r_u->num_entries = r_u->num_entries2 = num_jn;
  r_u->reshnd.ptr_hnd = 1;
  r_u->reshnd.handle = num_jn;
  
  r_u->ctr = (DFS_INFO_CTR*)talloc(p->mem_ctx, sizeof(DFS_INFO_CTR));
  if (!r_u->ctr)
    return WERR_NOMEM;
  ZERO_STRUCTP(r_u->ctr);
  r_u->ctr->switch_value = level;
  r_u->ctr->num_entries = num_jn;
  r_u->ctr->ptr_dfs_ctr = 1;
  
  r_u->status = init_reply_dfs_ctr(p->mem_ctx, level, r_u->ctr, jn, num_jn);

  return r_u->status;
}
      
WERROR _dfs_get_info(pipes_struct *p, DFS_Q_DFS_GET_INFO *q_u, 
                     DFS_R_DFS_GET_INFO *r_u)
{
  UNISTR2* uni_path = &q_u->uni_path;
  uint32 level = q_u->level;
  pstring path;
  struct junction_map jn;

  unistr2_to_ascii(path, uni_path, sizeof(path)-1);
  if(!create_junction(path, &jn))
     return WERR_DFS_NO_SUCH_SERVER;
  
  if(!get_referred_path(path, &jn, NULL, NULL))
     return WERR_DFS_NO_SUCH_VOL;

  r_u->level = level;
  r_u->ptr_ctr = 1;
  r_u->status = init_reply_dfs_ctr(p->mem_ctx, level, &r_u->ctr, &jn, 1);
  
  return r_u->status;
}