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a09e091a JB |
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 | #ifdef HAVE_XORG_CONFIG_H | |
55 | #include <xorg-config.h> | |
56 | #endif | |
57 | ||
58 | #include "os.h" | |
59 | #include "xf86Parser.h" | |
60 | #include "xf86tokens.h" | |
61 | #include "Configint.h" | |
62 | ||
63 | #include <unistd.h> | |
64 | #include <sys/types.h> | |
65 | #include <sys/wait.h> | |
66 | #include <signal.h> | |
67 | #include <errno.h> | |
68 | ||
69 | #if defined(HAVE_SETEUID) && defined(_POSIX_SAVED_IDS) && _POSIX_SAVED_IDS > 0 | |
70 | #define HAS_SAVED_IDS_AND_SETEUID | |
71 | #endif | |
72 | #if defined(WIN32) | |
73 | #define HAS_NO_UIDS | |
74 | #endif | |
75 | ||
76 | #ifdef HAS_NO_UIDS | |
77 | #define doWriteConfigFile xf86writeConfigFile | |
78 | #define Local /**/ | |
79 | #else | |
80 | #define Local static | |
81 | #endif | |
82 | ||
83 | Local int | |
84 | doWriteConfigFile(const char *filename, XF86ConfigPtr cptr) | |
85 | { | |
86 | FILE *cf; | |
87 | ||
88 | if ((cf = fopen(filename, "w")) == NULL) { | |
89 | return 0; | |
90 | } | |
91 | ||
92 | if (cptr->conf_comment) | |
93 | fprintf(cf, "%s\n", cptr->conf_comment); | |
94 | ||
95 | xf86printLayoutSection(cf, cptr->conf_layout_lst); | |
96 | ||
97 | if (cptr->conf_files != NULL) { | |
98 | fprintf(cf, "Section \"Files\"\n"); | |
99 | xf86printFileSection(cf, cptr->conf_files); | |
100 | fprintf(cf, "EndSection\n\n"); | |
101 | } | |
102 | ||
103 | if (cptr->conf_modules != NULL) { | |
104 | fprintf(cf, "Section \"Module\"\n"); | |
105 | xf86printModuleSection(cf, cptr->conf_modules); | |
106 | fprintf(cf, "EndSection\n\n"); | |
107 | } | |
108 | ||
109 | xf86printVendorSection(cf, cptr->conf_vendor_lst); | |
110 | ||
111 | xf86printServerFlagsSection(cf, cptr->conf_flags); | |
112 | ||
113 | xf86printInputSection(cf, cptr->conf_input_lst); | |
114 | ||
115 | xf86printInputClassSection(cf, cptr->conf_inputclass_lst); | |
116 | ||
117 | xf86printVideoAdaptorSection(cf, cptr->conf_videoadaptor_lst); | |
118 | ||
119 | xf86printModesSection(cf, cptr->conf_modes_lst); | |
120 | ||
121 | xf86printMonitorSection(cf, cptr->conf_monitor_lst); | |
122 | ||
123 | xf86printDeviceSection(cf, cptr->conf_device_lst); | |
124 | ||
125 | xf86printScreenSection(cf, cptr->conf_screen_lst); | |
126 | ||
127 | xf86printDRISection(cf, cptr->conf_dri); | |
128 | ||
129 | xf86printExtensionsSection(cf, cptr->conf_extensions); | |
130 | ||
131 | fclose(cf); | |
132 | return 1; | |
133 | } | |
134 | ||
135 | #ifndef HAS_NO_UIDS | |
136 | ||
137 | int | |
138 | xf86writeConfigFile(const char *filename, XF86ConfigPtr cptr) | |
139 | { | |
140 | int ret; | |
141 | ||
142 | #if !defined(HAS_SAVED_IDS_AND_SETEUID) | |
143 | int pid, p; | |
144 | int status; | |
145 | void (*csig) (int); | |
146 | #else | |
147 | int ruid, euid; | |
148 | #endif | |
149 | ||
150 | if (getuid() != geteuid()) { | |
151 | ||
152 | #if !defined(HAS_SAVED_IDS_AND_SETEUID) | |
153 | /* Need to fork to change ruid without loosing euid */ | |
154 | csig = signal(SIGCHLD, SIG_DFL); | |
155 | switch ((pid = fork())) { | |
156 | case -1: | |
157 | ErrorF("xf86writeConfigFile(): fork failed (%s)\n", | |
158 | strerror(errno)); | |
159 | return 0; | |
160 | case 0: /* child */ | |
161 | if (setuid(getuid()) == -1) | |
162 | FatalError("xf86writeConfigFile(): " | |
163 | "setuid failed(%s)\n", strerror(errno)); | |
164 | ret = doWriteConfigFile(filename, cptr); | |
165 | exit(ret); | |
166 | break; | |
167 | default: /* parent */ | |
168 | do { | |
169 | p = waitpid(pid, &status, 0); | |
170 | } while (p == -1 && errno == EINTR); | |
171 | } | |
172 | signal(SIGCHLD, csig); | |
173 | if (p != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0) | |
174 | return 1; /* success */ | |
175 | else | |
176 | return 0; | |
177 | ||
178 | #else /* HAS_SAVED_IDS_AND_SETEUID */ | |
179 | ||
180 | ruid = getuid(); | |
181 | euid = geteuid(); | |
182 | ||
183 | if (seteuid(ruid) == -1) { | |
184 | ErrorF("xf86writeConfigFile(): seteuid(%d) failed (%s)\n", | |
185 | ruid, strerror(errno)); | |
186 | return 0; | |
187 | } | |
188 | ret = doWriteConfigFile(filename, cptr); | |
189 | ||
190 | if (seteuid(euid) == -1) { | |
191 | ErrorF("xf86writeConfigFile(): seteuid(%d) failed (%s)\n", | |
192 | euid, strerror(errno)); | |
193 | } | |
194 | return ret; | |
195 | ||
196 | #endif /* HAS_SAVED_IDS_AND_SETEUID */ | |
197 | ||
198 | } | |
199 | else { | |
200 | return doWriteConfigFile(filename, cptr); | |
201 | } | |
202 | } | |
203 | ||
204 | #endif /* !HAS_NO_UIDS */ |