xserver

write.c (6474B)

---

 /*
  * 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).
  */
 
 #ifdef HAVE_XORG_CONFIG_H
 #include <xorg-config.h>
 #endif
 
 #include "os.h"
 #include "xf86Parser.h"
 #include "xf86tokens.h"
 #include "Configint.h"
 
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <errno.h>
 
 #if defined(HAVE_SETEUID) && defined(_POSIX_SAVED_IDS) && _POSIX_SAVED_IDS > 0
 #define HAS_SAVED_IDS_AND_SETEUID
 #endif
 #if defined(WIN32)
 #define HAS_NO_UIDS
 #endif
 
 static 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);
 
     if (cptr->conf_files != NULL) {
         fprintf(cf, "Section \"Files\"\n");
         xf86printFileSection(cf, cptr->conf_files);
         fprintf(cf, "EndSection\n\n");
     }
 
     if (cptr->conf_modules != NULL) {
         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);
 
     xf86printInputClassSection(cf, cptr->conf_inputclass_lst);
 
     xf86printOutputClassSection(cf, cptr->conf_outputclass_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;
 }
 
 int
 xf86writeConfigFile(const char *filename, XF86ConfigPtr cptr)
 {
 #ifndef HAS_NO_UIDS
     int ret;
 
     if (getuid() != geteuid()) {
 
 #if !defined(HAS_SAVED_IDS_AND_SETEUID)
         int pid, p;
         int status;
         void (*csig) (int);
 
         /* Need to fork to change ruid without losing euid */
         csig = OsSignal(SIGCHLD, SIG_DFL);
         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);
         }
         OsSignal(SIGCHLD, csig);
         if (p != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0)
             return 1;           /* success */
         else
             return 0;
 
 #else                           /* HAS_SAVED_IDS_AND_SETEUID */
         int ruid, euid;
 
         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
 #endif                          /* !HAS_NO_UIDS */
         return doWriteConfigFile(filename, cptr);
 }