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write.c

/* $XFree86: xc/programs/Xserver/hw/xfree86/parser/write.c,v 1.18 2003/08/24 17:37:08 dawes Exp $ */
/* 
 * 
 * Copyright (c) 1997  Metro Link Incorporated
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * Except as contained in this notice, the name of the Metro Link shall not be
 * used in advertising or otherwise to promote the sale, use or other dealings
 * in this Software without prior written authorization from Metro Link.
 * 
 */
/*
 * Copyright (c) 1997-2003 by The XFree86 Project, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of the copyright holder(s)
 * and author(s) shall not be used in advertising or otherwise to promote
 * the sale, use or other dealings in this Software without prior written
 * authorization from the copyright holder(s) and author(s).
 */


/* View/edit this file with tab stops set to 4 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include "xf86Parser.h"
#include "xf86tokens.h"
#include "Configint.h"

#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>

#if ((defined(sun) && !defined(SVR4)) || defined(macII)) && !defined(__GLIBC__)
#ifndef strerror
extern char *sys_errlist[];
extern int sys_nerr;
#define strerror(n) \
      (((n) >= 0 && (n) < sys_nerr) ? sys_errlist[n] : "unknown error")
#endif
#endif

#if defined(SVR4) || defined(__linux__) || defined(CSRG_BASED)
#define HAS_SAVED_IDS_AND_SETEUID
#endif
#if defined(__UNIXOS2__) || defined(WIN32)
#define HAS_NO_UIDS
#endif

#ifdef HAS_NO_UIDS
#define doWriteConfigFile xf86writeConfigFile
#define Local /**/
#else
#define Local static
#endif

Local int
doWriteConfigFile (const char *filename, XF86ConfigPtr cptr)
{
      FILE *cf;

      if ((cf = fopen (filename, "w")) == NULL)
      {
            return 0;
      }

      if (cptr->conf_comment)
            fprintf (cf, "%s\n", cptr->conf_comment);

      xf86printLayoutSection (cf, cptr->conf_layout_lst);

      fprintf (cf, "Section \"Files\"\n");
      xf86printFileSection (cf, cptr->conf_files);
      fprintf (cf, "EndSection\n\n");

      fprintf (cf, "Section \"Module\"\n");
      xf86printModuleSection (cf, cptr->conf_modules);
      fprintf (cf, "EndSection\n\n");

      xf86printVendorSection (cf, cptr->conf_vendor_lst);

      xf86printServerFlagsSection (cf, cptr->conf_flags);

      xf86printInputSection (cf, cptr->conf_input_lst);

      xf86printVideoAdaptorSection (cf, cptr->conf_videoadaptor_lst);

      xf86printModesSection (cf, cptr->conf_modes_lst);

      xf86printMonitorSection (cf, cptr->conf_monitor_lst);

      xf86printDeviceSection (cf, cptr->conf_device_lst);

      xf86printScreenSection (cf, cptr->conf_screen_lst);

      xf86printDRISection (cf, cptr->conf_dri);

      xf86printExtensionsSection (cf, cptr->conf_extensions);

      fclose(cf);
      return 1;
}

#ifndef HAS_NO_UIDS

int
xf86writeConfigFile (const char *filename, XF86ConfigPtr cptr)
{
      int ret;

#if !defined(HAS_SAVED_IDS_AND_SETEUID)
      int pid, p;
      int status;
      void (*csig)(int);
#else
      int ruid, euid;
#endif

      if (getuid() != geteuid())
      {

#if !defined(HAS_SAVED_IDS_AND_SETEUID)
            /* Need to fork to change ruid without loosing euid */
#ifdef SIGCHLD
            csig = signal(SIGCHLD, SIG_DFL);
#endif
            switch ((pid = fork()))
            {
            case -1:
                  ErrorF("xf86writeConfigFile(): fork failed (%s)\n",
                              strerror(errno));
                  return 0;
            case 0: /* child */
                  if (setuid(getuid()) == -1) 
                      FatalError("xf86writeConfigFile(): "
                        "setuid failed(%s)\n", 
                        strerror(errno));
                  ret = doWriteConfigFile(filename, cptr);
                  exit(ret);
                  break;
            default: /* parent */
                  do
                  {
                        p = waitpid(pid, &status, 0);
                  } while (p == -1 && errno == EINTR);
            }
#ifdef SIGCHLD
            signal(SIGCHLD, csig);
#endif
            if (p != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0)
                  return 1;   /* success */
            else
                  return 0;

#else /* HAS_SAVED_IDS_AND_SETEUID */

            ruid = getuid();
            euid = geteuid();

            if (seteuid(ruid) == -1)
            {
                  ErrorF("xf86writeConfigFile(): seteuid(%d) failed (%s)\n",
                              ruid, strerror(errno));
                  return 0;
            }
            ret = doWriteConfigFile(filename, cptr);

            if (seteuid(euid) == -1)
            {
                  ErrorF("xf86writeConfigFile(): seteuid(%d) failed (%s)\n",
                              euid, strerror(errno));
            }
            return ret;

#endif /* HAS_SAVED_IDS_AND_SETEUID */

      }
      else
      {
            return doWriteConfigFile(filename, cptr);
      }
}

#endif /* !HAS_NO_UIDS */

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