1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24#include "tool_setup.h" 25 26#ifdef HAVE_PWD_H 27# undef __NO_NET_API /* required for building for AmigaOS */ 28# include <pwd.h> 29#endif 30 31#ifdef HAVE_SYS_STAT_H 32#include <sys/stat.h> 33#endif 34#ifdef HAVE_FCNTL_H 35#include <fcntl.h> 36#endif 37 38#include <curl/mprintf.h> 39 40#include "tool_findfile.h" 41 42#include "memdebug.h" /* keep this as LAST include */ 43 44struct finder { 45 const char *env; 46 const char *append; 47 bool withoutdot; 48}; 49 50/* The order of the variables below is important, as the index number is used 51 in the findfile() function */ 52static const struct finder conf_list[] = { 53 { "CURL_HOME", NULL, FALSE }, 54 { "XDG_CONFIG_HOME", NULL, FALSE }, /* index == 1, used in the code */ 55 { "HOME", NULL, FALSE }, 56#ifdef _WIN32 57 { "USERPROFILE", NULL, FALSE }, 58 { "APPDATA", NULL, FALSE }, 59 { "USERPROFILE", "\\Application Data", FALSE}, 60#endif 61 /* these are for .curlrc if XDG_CONFIG_HOME is not defined */ 62 { "CURL_HOME", "/.config", TRUE }, 63 { "HOME", "/.config", TRUE }, 64 65 { NULL, NULL, FALSE } 66}; 67 68static char *checkhome(const char *home, const char *fname, bool dotscore) 69{ 70 const char pref[2] = { '.', '_' }; 71 int i; 72 for(i = 0; i < (dotscore ? 2 : 1); i++) { 73 char *c; 74 if(dotscore) 75 c = curl_maprintf("%s" DIR_CHAR "%c%s", home, pref[i], &fname[1]); 76 else 77 c = curl_maprintf("%s" DIR_CHAR "%s", home, fname); 78 if(c) { 79 int fd = open(c, O_RDONLY); 80 if(fd >= 0) { 81 char *path = strdup(c); 82 close(fd); 83 curl_free(c); 84 return path; 85 } 86 curl_free(c); 87 } 88 } 89 return NULL; 90} 91 92/* 93 * findfile() - return the full path name of the file. 94 * 95 * If 'dotscore' is TRUE, then check for the file first with a leading dot 96 * and then with a leading underscore. 97 * 98 * 1. Iterate over the environment variables in order, and if set, check for 99 * the given file to be accessed there, then it is a match. 100 * 2. Non-windows: try getpwuid 101 */ 102char *findfile(const char *fname, int dotscore) 103{ 104 int i; 105 bool xdg = FALSE; 106 DEBUGASSERT(fname && fname[0]); 107 DEBUGASSERT((dotscore != 1) || (fname[0] == '.')); 108 109 if(!fname[0]) 110 return NULL; 111 112 for(i = 0; conf_list[i].env; i++) { 113 char *home = curl_getenv(conf_list[i].env); 114 if(home) { 115 char *path; 116 const char *filename = fname; 117 if(i == 1 /* XDG_CONFIG_HOME */) 118 xdg = TRUE; 119 if(!home[0]) { 120 curl_free(home); 121 continue; 122 } 123 if(conf_list[i].append) { 124 char *c = curl_maprintf("%s%s", home, conf_list[i].append); 125 curl_free(home); 126 if(!c) 127 return NULL; 128 home = c; 129 } 130 if(conf_list[i].withoutdot) { 131 if(!dotscore || xdg) { 132 /* this is not looking for .curlrc, or the XDG_CONFIG_HOME was 133 defined so we skip the extended check */ 134 curl_free(home); 135 continue; 136 } 137 filename++; /* move past the leading dot */ 138 dotscore = 0; /* disable it for this check */ 139 } 140 path = checkhome(home, filename, dotscore ? dotscore - 1 : 0); 141 curl_free(home); 142 if(path) 143 return path; 144 } 145 } 146#if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID) 147 { 148 struct passwd *pw = getpwuid(geteuid()); 149 if(pw) { 150 char *home = pw->pw_dir; 151 if(home && home[0]) 152 return checkhome(home, fname, FALSE); 153 } 154 } 155#endif /* PWD-stuff */ 156 return NULL; 157} 158