xorg-server-1.4/hw/xfree86/parser/write.c

   1 /*
   2  * Copyright (c) 1997  Metro Link Incorporated
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  18  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  19  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  20  * SOFTWARE.
  21  *
  22  * Except as contained in this notice, the name of the Metro Link shall not be
  23  * used in advertising or otherwise to promote the sale, use or other dealings
  24  * in this Software without prior written authorization from Metro Link.
  25  *
  26  */
  27 /*
  28  * Copyright (c) 1997-2003 by The XFree86 Project, Inc.
  29  *
  30  * Permission is hereby granted, free of charge, to any person obtaining a
  31  * copy of this software and associated documentation files (the "Software"),
  32  * to deal in the Software without restriction, including without limitation
  33  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  34  * and/or sell copies of the Software, and to permit persons to whom the
  35  * Software is furnished to do so, subject to the following conditions:
  36  *
  37  * The above copyright notice and this permission notice shall be included in
  38  * all copies or substantial portions of the Software.
  39  *
  40  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  41  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  42  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  43  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  44  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  45  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  46  * OTHER DEALINGS IN THE SOFTWARE.
  47  *
  48  * Except as contained in this notice, the name of the copyright holder(s)
  49  * and author(s) shall not be used in advertising or otherwise to promote
  50  * the sale, use or other dealings in this Software without prior written
  51  * authorization from the copyright holder(s) and author(s).
  52  */
  53
  54
  55 /* View/edit this file with tab stops set to 4 */
  56
  57 #ifdef HAVE_XORG_CONFIG_H
  58 #include <xorg-config.h>
  59 #endif
  60
  61 #include "xf86Parser.h"
  62 #include "xf86tokens.h"
  63 #include "Configint.h"
  64
  65 #include <unistd.h>
  66 #include <sys/types.h>
  67 #include <sys/wait.h>
  68 #include <signal.h>
  69 #include <errno.h>
  70
  71 #if ((defined(sun) && !defined(SVR4)) || defined(macII)) && !defined(__GLIBC__)
  72 #ifndef strerror
  73 extern char *sys_errlist[];
  74 extern int sys_nerr;
  75 #define strerror(n) \
  76         (((n) >= 0 && (n) < sys_nerr) ? sys_errlist[n] : "unknown error")
  77 #endif
  78 #endif
  79
  80 #if defined(SVR4) || defined(__linux__) || defined(CSRG_BASED)
  81 #define HAS_SAVED_IDS_AND_SETEUID
  82 #endif
  83 #if defined(WIN32)
  84 #define HAS_NO_UIDS
  85 #endif
  86
  87 #ifdef HAS_NO_UIDS
  88 #define doWriteConfigFile xf86writeConfigFile
  89 #define Local /**/
  90 #else
  91 #define Local static
  92 #endif
  93
  94 Local int
  95 doWriteConfigFile (const char *filename, XF86ConfigPtr cptr)
  96 {
  97         FILE *cf;
  98
  99         if ((cf = fopen (filename, "w")) == NULL)
 100         {
 101                 return 0;
 102         }
 103
 104         if (cptr->conf_comment)
 105                 fprintf (cf, "%s\n", cptr->conf_comment);
 106
 107         xf86printLayoutSection (cf, cptr->conf_layout_lst);
 108
 109         if (cptr->conf_files != NULL)
 110         {
 111                 fprintf (cf, "Section \"Files\"\n");
 112                 xf86printFileSection (cf, cptr->conf_files);
 113                 fprintf (cf, "EndSection\n\n");
 114         }
 115
 116         if (cptr->conf_modules != NULL)
 117         {
 118                 fprintf (cf, "Section \"Module\"\n");
 119                 xf86printModuleSection (cf, cptr->conf_modules);
 120                 fprintf (cf, "EndSection\n\n");
 121         }
 122
 123         xf86printVendorSection (cf, cptr->conf_vendor_lst);
 124
 125         xf86printServerFlagsSection (cf, cptr->conf_flags);
 126
 127         xf86printInputSection (cf, cptr->conf_input_lst);
 128
 129         xf86printVideoAdaptorSection (cf, cptr->conf_videoadaptor_lst);
 130
 131         xf86printModesSection (cf, cptr->conf_modes_lst);
 132
 133         xf86printMonitorSection (cf, cptr->conf_monitor_lst);
 134
 135         xf86printDeviceSection (cf, cptr->conf_device_lst);
 136
 137         xf86printScreenSection (cf, cptr->conf_screen_lst);
 138
 139         xf86printDRISection (cf, cptr->conf_dri);
 140
 141         xf86printExtensionsSection (cf, cptr->conf_extensions);
 142
 143         fclose(cf);
 144         return 1;
 145 }
 146
 147 #ifndef HAS_NO_UIDS
 148
 149 int
 150 xf86writeConfigFile (const char *filename, XF86ConfigPtr cptr)
 151 {
 152         int ret;
 153
 154 #if !defined(HAS_SAVED_IDS_AND_SETEUID)
 155         int pid, p;
 156         int status;
 157         void (*csig)(int);
 158 #else
 159         int ruid, euid;
 160 #endif
 161
 162         if (getuid() != geteuid())
 163         {
 164
 165 #if !defined(HAS_SAVED_IDS_AND_SETEUID)
 166                 /* Need to fork to change ruid without loosing euid */
 167 #ifdef SIGCHLD
 168                 csig = signal(SIGCHLD, SIG_DFL);
 169 #endif
 170                 switch ((pid = fork()))
 171                 {
 172                 case -1:
 173                         ErrorF("xf86writeConfigFile(): fork failed (%s)\n",
 174                                         strerror(errno));
 175                         return 0;
 176                 case 0: /* child */
 177                         if (setuid(getuid()) == -1)
 178                             FatalError("xf86writeConfigFile(): "
 179                                 "setuid failed(%s)\n",
 180                                 strerror(errno));
 181                         ret = doWriteConfigFile(filename, cptr);
 182                         exit(ret);
 183                         break;
 184                 default: /* parent */
 185                         do
 186                         {
 187                                 p = waitpid(pid, &status, 0);
 188                         } while (p == -1 && errno == EINTR);
 189                 }
 190 #ifdef SIGCHLD
 191                 signal(SIGCHLD, csig);
 192 #endif
 193                 if (p != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0)
 194                         return 1;       /* success */
 195                 else
 196                         return 0;
 197
 198 #else /* HAS_SAVED_IDS_AND_SETEUID */
 199
 200                 ruid = getuid();
 201                 euid = geteuid();
 202
 203                 if (seteuid(ruid) == -1)
 204                 {
 205                         ErrorF("xf86writeConfigFile(): seteuid(%d) failed (%s)\n",
 206                                         ruid, strerror(errno));
 207                         return 0;
 208                 }
 209                 ret = doWriteConfigFile(filename, cptr);
 210
 211                 if (seteuid(euid) == -1)
 212                 {
 213                         ErrorF("xf86writeConfigFile(): seteuid(%d) failed (%s)\n",
 214                                         euid, strerror(errno));
 215                 }
 216                 return ret;
 217
 218 #endif /* HAS_SAVED_IDS_AND_SETEUID */
 219
 220         }
 221         else
 222         {
 223                 return doWriteConfigFile(filename, cptr);
 224         }
 225 }
 226
 227 #endif /* !HAS_NO_UIDS */