/* Editor Settings: expandtabs and use 4 spaces for indentation
 * ex: set softtabstop=4 tabstop=8 expandtab shiftwidth=4: *
 * -*- mode: c, c-basic-offset: 4 -*- */

/*
 * Copyright Likewise Software    2004-2008
 * All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the license, or (at
 * your option) any later version.
 *
 * This library 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 Lesser
 * General Public License for more details.  You should have received a copy
 * of the GNU Lesser General Public License along with this program.  If
 * not, see <http://www.gnu.org/licenses/>.
 *
 * LIKEWISE SOFTWARE MAKES THIS SOFTWARE AVAILABLE UNDER OTHER LICENSING
 * TERMS AS WELL.  IF YOU HAVE ENTERED INTO A SEPARATE LICENSE AGREEMENT
 * WITH LIKEWISE SOFTWARE, THEN YOU MAY ELECT TO USE THE SOFTWARE UNDER THE
 * TERMS OF THAT SOFTWARE LICENSE AGREEMENT INSTEAD OF THE TERMS OF THE GNU
 * LESSER GENERAL PUBLIC LICENSE, NOTWITHSTANDING THE ABOVE NOTICE.  IF YOU
 * HAVE QUESTIONS, OR WISH TO REQUEST A COPY OF THE ALTERNATE LICENSING
 * TERMS OFFERED BY LIKEWISE SOFTWARE, PLEASE CONTACT LIKEWISE SOFTWARE AT
 * license@likewisesoftware.com
 */

/*
 * Copyright Likewise Software    2004-2008
 * All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the license, or (at
 * your option) any later version.
 *
 * This library 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 Lesser
 * General Public License for more details.  You should have received a copy
 * of the GNU Lesser General Public License along with this program.  If
 * not, see <http://www.gnu.org/licenses/>.
 *
 * LIKEWISE SOFTWARE MAKES THIS SOFTWARE AVAILABLE UNDER OTHER LICENSING
 * TERMS AS WELL.  IF YOU HAVE ENTERED INTO A SEPARATE LICENSE AGREEMENT
 * WITH LIKEWISE SOFTWARE, THEN YOU MAY ELECT TO USE THE SOFTWARE UNDER THE
 * TERMS OF THAT SOFTWARE LICENSE AGREEMENT INSTEAD OF THE TERMS OF THE GNU
 * LESSER GENERAL PUBLIC LICENSE, NOTWITHSTANDING THE ABOVE NOTICE.  IF YOU
 * HAVE QUESTIONS, OR WISH TO REQUEST A COPY OF THE ALTERNATE LICENSING
 * TERMS OFFERED BY LIKEWISE SOFTWARE, PLEASE CONTACT LIKEWISE SOFTWARE AT
 * license@likewisesoftware.com
 */

#include "config.h"
#include "ctbase.h"
#if HAVE_UTMPS_H
#include <utmps.h>
#elif HAVE_UTMPX_H
#include <utmpx.h>
#elif HAVE_UTMP_H
#include <utmp.h>
#endif

#ifdef __LWI_FREEBSD__
#define UT_ID ut_name
/* Small implementation of utmp functions */

FILE* utmp_file = NULL;
struct utmp utmp_struct;

static void
utmp_init(void)
{
    if (!utmp_file)
        utmp_file = fopen(_PATH_UTMP, "r");
}

static void
setutent(void)
{
    utmp_init();
    rewind(utmp_file);
}

static struct utmp*
getutent(void)
{
    utmp_init();
    if (fread(&utmp_struct, sizeof(utmp_struct), 1, utmp_file) == 1)
        return &utmp_struct;
    else
        return NULL;
}

static void
endutent(void)
{
    if (utmp_file)
    {
        fclose(utmp_file);
        utmp_file = NULL;
    }
}

#else
#define UT_ID ut_id
#endif

CENTERROR
CTVerifyUID(
    uid_t uid
    )
{
  CENTERROR ceError = CENTERROR_SUCCESS;
  CHAR szBuf[1024];
  struct passwd user;
  struct passwd* pResult = NULL;
  
  memset(&user, 0, sizeof(struct passwd));

  if (getpwuid_r(uid, &user, szBuf, sizeof(szBuf), &pResult) < 0) {
    ceError = CTMapSystemError(errno);
    BAIL_ON_CENTERIS_ERROR(ceError);
  }

  if (!pResult) {
     ceError = CENTERROR_INVALID_UID;
     BAIL_ON_CENTERIS_ERROR(ceError);
  }
  
 error:

  return ceError;
}

CENTERROR
CTGetLoginId(
    uid_t uid,
    PSTR* ppszLoginId
    )
{
  CENTERROR ceError = CENTERROR_SUCCESS;
  CHAR szBuf[1024];
  struct passwd user;
  struct passwd* pResult = NULL;
  
  memset(&user, 0, sizeof(struct passwd));

  if (getpwuid_r(uid, &user, szBuf, sizeof(szBuf), &pResult) < 0) {
    ceError = CTMapSystemError(errno);
    BAIL_ON_CENTERIS_ERROR(ceError);
  }

  if (!pResult) {
     ceError = CENTERROR_INVALID_UID;
     BAIL_ON_CENTERIS_ERROR(ceError);
  }

  ceError = CTAllocateString(user.pw_name, ppszLoginId);
  BAIL_ON_CENTERIS_ERROR(ceError);

  return ceError;

error:

  *ppszLoginId = NULL;

  return ceError;
}

CENTERROR
CTGetUID(
    PCSTR pszUID,
    uid_t* pUID
    )
{
  CENTERROR ceError = CENTERROR_SUCCESS;

  if (IsNullOrEmptyString(pszUID)) {
    ceError = CENTERROR_INVALID_UID;
    BAIL_ON_CENTERIS_ERROR(ceError);
  }

  if (CTIsAllDigit(pszUID)) {
    uid_t uid = atoi(pszUID);

    ceError = CTVerifyUID(uid);
    BAIL_ON_CENTERIS_ERROR(ceError);

    *pUID = uid;
  }
  else {
    CHAR szBuf[1024];
    struct passwd user;
    struct passwd* pResult = NULL;

    memset(&user, 0, sizeof(struct passwd));

    if (getpwnam_r(pszUID, &user, szBuf, sizeof(szBuf), &pResult) < 0) {
      ceError = CTMapSystemError(errno);
      BAIL_ON_CENTERIS_ERROR(ceError);
    }

    if (!pResult) {
       ceError = CENTERROR_INVALID_UID;
       BAIL_ON_CENTERIS_ERROR(ceError);
    }
    
    *pUID = user.pw_uid;
  }

 error:

  return ceError;
}

CENTERROR
CTGetUserGID(
    PCSTR pszGID,
    gid_t* pGID
    )
{
  CENTERROR ceError = CENTERROR_SUCCESS;

  if (IsNullOrEmptyString(pszGID)) {
    ceError = CENTERROR_INVALID_GID;
    BAIL_ON_CENTERIS_ERROR(ceError);
  }

  if (CTIsAllDigit(pszGID)) {
    gid_t gid = atoi(pszGID);
    *pGID = gid;
  }
  else {
    CHAR szBuf[1024];
    struct passwd user;
    struct passwd* pResult = NULL;

    memset(&user, 0, sizeof(struct passwd));

    if (getpwnam_r(pszGID, &user, szBuf, sizeof(szBuf), &pResult) < 0) {
      ceError = CTMapSystemError(errno);
      BAIL_ON_CENTERIS_ERROR(ceError);
    }

    if (!pResult) {
       ceError = CENTERROR_INVALID_GID;
       BAIL_ON_CENTERIS_ERROR(ceError);
    }
    
    *pGID = user.pw_gid;
  }

 error:

  return ceError;
}

CENTERROR
CTGetHomeDirectory(
		uid_t uid,
		PSTR* ppszHomeDir
		)
{
	CENTERROR ceError = CENTERROR_SUCCESS;
	PSTR pszHomeDir = NULL;
	CHAR szBuf[1024];
	struct passwd user;
	struct passwd* pResult = NULL;

        memset(&user, 0, sizeof(struct passwd));
	  
	if (getpwuid_r(uid, &user, szBuf, sizeof(szBuf), &pResult) < 0) {
	     ceError = CTMapSystemError(errno);
	     BAIL_ON_CENTERIS_ERROR(ceError);
	}

	  if (!pResult) {
	     ceError = CENTERROR_INVALID_UID;
	     BAIL_ON_CENTERIS_ERROR(ceError);
	  }
	  
	  ceError = CTAllocateString(pResult->pw_dir, &pszHomeDir);
	  BAIL_ON_CENTERIS_ERROR(ceError);
	  
	  *ppszHomeDir = pszHomeDir;
	  pszHomeDir = NULL;
	  
error:
	 
	 CT_SAFE_FREE_STRING(pszHomeDir);

	 return ceError;
}

CENTERROR
CTIsUserInX(BOOLEAN *inX)
{
#if HAVE_UTMPS_H
    struct utmps *ent;
#elif HAVE_UTMPX_H
    struct utmpx *ent;
#elif HAVE_UTMP_H
    struct utmp *ent;
#else
#error no utmp support found
#endif

    *inX = FALSE;

#if HAVE_UTMPS_H
    setutsent();
#elif HAVE_UTMPX_H
    setutxent();
#elif HAVE_UTMP_H
    setutent();
#endif
    while(1)
    {
#if HAVE_UTMPS_H
        ent = GETUTSENT();
#elif HAVE_UTMPX_H
        ent = getutxent();
#elif HAVE_UTMP_H
        ent = getutent();
#endif
        if(ent == NULL)
            break;
#ifdef USER_PROCESS
        if(ent->ut_type != USER_PROCESS)
            continue;
#endif
        if(
            /* Linux uses this */
            ent->ut_line[0] == ':' || ent->UT_ID[0] == ':' ||
            /* AIX uses this */
            (!strncmp(ent->ut_line, "lft", 3) && !strcmp(ent->UT_ID, "dt")) ||
            /* Solaris and HP-UX use this */
            (!strcmp(ent->ut_line, "console") && !strcmp(ent->UT_ID, "dt")))
        {
            *inX = TRUE;
            goto cleanup;
        }
    }

cleanup:
#if HAVE_UTMPS_H
    endutsent();
#elif HAVE_UTMPX_H
    endutxent();
#elif HAVE_UTMP_H
    endutent();
#endif

    return CENTERROR_SUCCESS;
}