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 <errno.h>
67
68#if defined(HAVE_SETEUID) && defined(_POSIX_SAVED_IDS) && _POSIX_SAVED_IDS > 0
69#define HAS_SAVED_IDS_AND_SETEUID
70#endif
71#if defined(WIN32)
72#define HAS_NO_UIDS
73#endif
74
75static int
76doWriteConfigFile(const char *filename, XF86ConfigPtr cptr)
77{
78    FILE *cf;
79
80    if ((cf = fopen(filename, "w")) == NULL) {
81        return 0;
82    }
83
84    if (cptr->conf_comment)
85        fprintf(cf, "%s\n", cptr->conf_comment);
86
87    xf86printLayoutSection(cf, cptr->conf_layout_lst);
88
89    if (cptr->conf_files != NULL) {
90        fprintf(cf, "Section \"Files\"\n");
91        xf86printFileSection(cf, cptr->conf_files);
92        fprintf(cf, "EndSection\n\n");
93    }
94
95    if (cptr->conf_modules != NULL) {
96        fprintf(cf, "Section \"Module\"\n");
97        xf86printModuleSection(cf, cptr->conf_modules);
98        fprintf(cf, "EndSection\n\n");
99    }
100
101    xf86printVendorSection(cf, cptr->conf_vendor_lst);
102
103    xf86printServerFlagsSection(cf, cptr->conf_flags);
104
105    xf86printInputSection(cf, cptr->conf_input_lst);
106
107    xf86printInputClassSection(cf, cptr->conf_inputclass_lst);
108
109    xf86printOutputClassSection(cf, cptr->conf_outputclass_lst);
110
111    xf86printVideoAdaptorSection(cf, cptr->conf_videoadaptor_lst);
112
113    xf86printModesSection(cf, cptr->conf_modes_lst);
114
115    xf86printMonitorSection(cf, cptr->conf_monitor_lst);
116
117    xf86printDeviceSection(cf, cptr->conf_device_lst);
118
119    xf86printScreenSection(cf, cptr->conf_screen_lst);
120
121    xf86printDRISection(cf, cptr->conf_dri);
122
123    xf86printExtensionsSection(cf, cptr->conf_extensions);
124
125    fclose(cf);
126    return 1;
127}
128
129int
130xf86writeConfigFile(const char *filename, XF86ConfigPtr cptr)
131{
132#ifndef HAS_NO_UIDS
133    int ret;
134
135    if (getuid() != geteuid()) {
136
137#if !defined(HAS_SAVED_IDS_AND_SETEUID)
138        int pid, p;
139        int status;
140        void (*csig) (int);
141
142        /* Need to fork to change ruid without losing euid */
143        csig = OsSignal(SIGCHLD, SIG_DFL);
144        switch ((pid = fork())) {
145        case -1:
146            ErrorF("xf86writeConfigFile(): fork failed (%s)\n",
147                   strerror(errno));
148            return 0;
149        case 0:                /* child */
150            if (setuid(getuid()) == -1)
151                FatalError("xf86writeConfigFile(): "
152                           "setuid failed(%s)\n", strerror(errno));
153            ret = doWriteConfigFile(filename, cptr);
154            exit(ret);
155            break;
156        default:               /* parent */
157            do {
158                p = waitpid(pid, &status, 0);
159            } while (p == -1 && errno == EINTR);
160        }
161        OsSignal(SIGCHLD, csig);
162        if (p != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0)
163            return 1;           /* success */
164        else
165            return 0;
166
167#else                           /* HAS_SAVED_IDS_AND_SETEUID */
168        int ruid, euid;
169
170        ruid = getuid();
171        euid = geteuid();
172
173        if (seteuid(ruid) == -1) {
174            ErrorF("xf86writeConfigFile(): seteuid(%d) failed (%s)\n",
175                   ruid, strerror(errno));
176            return 0;
177        }
178        ret = doWriteConfigFile(filename, cptr);
179
180        if (seteuid(euid) == -1) {
181            ErrorF("xf86writeConfigFile(): seteuid(%d) failed (%s)\n",
182                   euid, strerror(errno));
183        }
184        return ret;
185
186#endif                          /* HAS_SAVED_IDS_AND_SETEUID */
187
188    }
189    else
190#endif                          /* !HAS_NO_UIDS */
191        return doWriteConfigFile(filename, cptr);
192}
193