1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22 #include "tool_setup.h"
23
24 #ifdef HAVE_PWD_H
25 # include <pwd.h>
26 #endif
27
28 #ifdef HAVE_SYS_STAT_H
29 #include <sys/stat.h>
30 #endif
31 #ifdef HAVE_FCNTL_H
32 #include <fcntl.h>
33 #endif
34
35 #include <curl/mprintf.h>
36
37 #include "tool_homedir.h"
38
39 #include "memdebug.h" /* keep this as LAST include */
40
GetEnv(const char * variable)41 static char *GetEnv(const char *variable)
42 {
43 char *dupe, *env;
44
45 env = curl_getenv(variable);
46 if(!env)
47 return NULL;
48
49 dupe = strdup(env);
50 curl_free(env);
51 return dupe;
52 }
53
54 /* return the home directory of the current user as an allocated string */
55
56 /*
57 * The original logic found a home dir to use (by checking a range of
58 * environment variables and last using getpwuid) and returned that for the
59 * parent to use.
60 *
61 * With the XDG_CONFIG_HOME support (added much later than the other), this
62 * variable is treated differently in order to not ruin existing installations
63 * even if this environment variable is set. If this variable is set, and a
64 * file name is set to check, then only if that file name exists in that
65 * directory will it be returned as a "home directory".
66 *
67 * 1. use CURL_HOME if set
68 * 2. use XDG_CONFIG_HOME if set and fname is present
69 * 3. use HOME if set
70 * 4. Non-windows: use getpwuid
71 * 5. Windows: use APPDATA if set
72 * 6. Windows: use "USERPROFILE\Application Data" is set
73 */
74
homedir(const char * fname)75 char *homedir(const char *fname)
76 {
77 char *home;
78
79 home = GetEnv("CURL_HOME");
80 if(home)
81 return home;
82
83 if(fname) {
84 home = GetEnv("XDG_CONFIG_HOME");
85 if(home) {
86 char *c = curl_maprintf("%s" DIR_CHAR "%s", home, fname);
87 if(c) {
88 int fd = open(c, O_RDONLY);
89 curl_free(c);
90 if(fd >= 0) {
91 close(fd);
92 return home;
93 }
94 }
95 free(home);
96 }
97 }
98
99 home = GetEnv("HOME");
100 if(home)
101 return home;
102
103 #if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
104 {
105 struct passwd *pw = getpwuid(geteuid());
106
107 if(pw) {
108 home = pw->pw_dir;
109 if(home && home[0])
110 home = strdup(home);
111 else
112 home = NULL;
113 }
114 }
115 #endif /* PWD-stuff */
116 #ifdef WIN32
117 home = GetEnv("APPDATA");
118 if(!home) {
119 char *env = GetEnv("USERPROFILE");
120 if(env) {
121 char *path = curl_maprintf("%s\\Application Data", env);
122 if(path) {
123 home = strdup(path);
124 curl_free(path);
125 }
126 free(env);
127 }
128 }
129 #endif /* WIN32 */
130 return home;
131 }
132