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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "tool_setup.h"
#ifdef HAVE_PWD_H
# undef __NO_NET_API /* required for building for AmigaOS */
# include <pwd.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <curl/mprintf.h>
#include "tool_findfile.h"
#include "memdebug.h" /* keep this as LAST include */
struct finder {
const char *env;
const char *append;
bool withoutdot;
};
/* The order of the variables below is important, as the index number is used
in the findfile() function */
static const struct finder list[] = {
{ "CURL_HOME", NULL, FALSE },
{ "XDG_CONFIG_HOME", NULL, FALSE }, /* index == 1, used in the code */
{ "HOME", NULL, FALSE },
#ifdef WIN32
{ "USERPROFILE", NULL, FALSE },
{ "APPDATA", NULL, FALSE },
{ "USERPROFILE", "\\Application Data", FALSE},
#endif
/* these are for .curlrc if XDG_CONFIG_HOME is not defined */
{ "CURL_HOME", "/.config", TRUE },
{ "HOME", "/.config", TRUE },
{ NULL, NULL, FALSE }
};
static char *checkhome(const char *home, const char *fname, bool dotscore)
{
const char pref[2] = { '.', '_' };
int i;
for(i = 0; i < (dotscore ? 2 : 1); i++) {
char *c;
if(dotscore)
c = curl_maprintf("%s" DIR_CHAR "%c%s", home, pref[i], &fname[1]);
else
c = curl_maprintf("%s" DIR_CHAR "%s", home, fname);
if(c) {
int fd = open(c, O_RDONLY);
if(fd >= 0) {
char *path = strdup(c);
close(fd);
curl_free(c);
return path;
}
curl_free(c);
}
}
return NULL;
}
/*
* findfile() - return the full path name of the file.
*
* If 'dotscore' is TRUE, then check for the file first with a leading dot
* and then with a leading underscore.
*
* 1. Iterate over the environment variables in order, and if set, check for
* the given file to be accessed there, then it is a match.
* 2. Non-windows: try getpwuid
*/
char *findfile(const char *fname, int dotscore)
{
int i;
bool xdg = FALSE;
DEBUGASSERT(fname && fname[0]);
DEBUGASSERT((dotscore != 1) || (fname[0] == '.'));
if(!fname[0])
return NULL;
for(i = 0; list[i].env; i++) {
char *home = curl_getenv(list[i].env);
if(home) {
char *path;
const char *filename = fname;
if(i == 1 /* XDG_CONFIG_HOME */)
xdg = TRUE;
if(!home[0]) {
curl_free(home);
continue;
}
if(list[i].append) {
char *c = curl_maprintf("%s%s", home, list[i].append);
curl_free(home);
if(!c)
return NULL;
home = c;
}
if(list[i].withoutdot) {
if(!dotscore || xdg) {
/* this is not looking for .curlrc, or the XDG_CONFIG_HOME was
defined so we skip the extended check */
curl_free(home);
continue;
}
filename++; /* move past the leading dot */
dotscore = 0; /* disable it for this check */
}
path = checkhome(home, filename, dotscore ? dotscore - 1 : 0);
curl_free(home);
if(path)
return path;
}
}
#if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
{
struct passwd *pw = getpwuid(geteuid());
if(pw) {
char *home = pw->pw_dir;
if(home && home[0])
return checkhome(home, fname, FALSE);
}
}
#endif /* PWD-stuff */
return NULL;
}
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