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/*
* This file is part of ltrace.
* Copyright (C) 2012, 2013 Petr Machata
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#define _POSIX_C_SOURCE 200809L
#include <sys/types.h>
#include <alloca.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "backend.h"
#include "dict.h"
#include "options.h"
#include "sysdep.h"
#include "vect.h"
static char *
append(const char *str1, const char *str2)
{
char *ret = malloc(strlen(str1) + strlen(str2) + 2);
if (ret == NULL)
return ret;
strcpy(stpcpy(ret, str1), str2);
return ret;
}
static void
add_dir(struct vect *dirs, const char *str1, const char *str2)
{
char *dir = append(str1, str2);
if (dir != NULL
&& VECT_PUSHBACK(dirs, &dir) < 0)
fprintf(stderr,
"Couldn't store candidate config directory %s%s: %s.\n",
str1, str2, strerror(errno));
}
static enum callback_status
add_dir_component_cb(struct opt_F_t *entry, void *data)
{
struct vect *dirs = data;
if (opt_F_get_kind(entry) == OPT_F_DIR)
add_dir(dirs, entry->pathname, "/ltrace");
return CBS_CONT;
}
static void
destroy_opt_F_cb(struct opt_F_t *entry, void *data)
{
opt_F_destroy(entry);
}
static char *g_home_dir = NULL;
int
os_get_config_dirs(int private, const char ***retp)
{
/* Vector of char *. Contains first pointers to local paths,
* then NULL, then pointers to system paths, then another
* NULL. SYS_START points to the beginning of the second
* part. */
static struct vect dirs;
static ssize_t sys_start = 0;
again:
if (sys_start != 0) {
if (sys_start == -1)
return -1;
if (retp != NULL) {
if (private)
*retp = VECT_ELEMENT(&dirs, const char *, 0);
else
*retp = VECT_ELEMENT(&dirs, const char *,
(size_t)sys_start);
}
return 0;
}
VECT_INIT(&dirs, char *);
char *home = getenv("HOME");
if (home == NULL) {
struct passwd *pwd = getpwuid(getuid());
if (pwd != NULL)
home = pwd->pw_dir;
}
size_t home_len = home != NULL ? strlen(home) : 0;
/* The values coming from getenv and getpwuid may not be
* persistent. */
if (home != NULL) {
free(g_home_dir);
g_home_dir = strdup(home);
if (g_home_dir != NULL) {
home = g_home_dir;
} else {
char *tmp = alloca(home_len + 1);
strcpy(tmp, home);
home = tmp;
}
}
char *xdg_home = getenv("XDG_CONFIG_HOME");
if (xdg_home == NULL && home != NULL) {
xdg_home = alloca(home_len + sizeof "/.config");
sprintf(xdg_home, "%s/.config", home);
}
if (xdg_home != NULL)
add_dir(&dirs, xdg_home, "/ltrace");
if (home != NULL)
add_dir(&dirs, home, "/.ltrace");
char *delim = NULL;
if (VECT_PUSHBACK(&dirs, &delim) < 0) {
fail:
/* This can't work :( */
fprintf(stderr,
"Couldn't initialize list of config directories: %s.\n",
strerror(errno));
VECT_DESTROY(&dirs, const char *, dict_dtor_string, NULL);
sys_start = -1;
return -1;
}
sys_start = vect_size(&dirs);
/* """preference-ordered set of base directories to search for
* configuration files in addition to the $XDG_CONFIG_HOME
* base directory. The directories in $XDG_CONFIG_DIRS should
* be seperated with a colon ':'.""" */
char *xdg_sys = getenv("XDG_CONFIG_DIRS");
if (xdg_sys != NULL) {
struct vect v;
VECT_INIT(&v, struct opt_F_t);
if (parse_colon_separated_list(xdg_sys, &v) < 0
|| VECT_EACH(&v, struct opt_F_t, NULL,
add_dir_component_cb, &dirs) != NULL)
fprintf(stderr,
"Error processing $XDG_CONFIG_DIRS '%s': %s\n",
xdg_sys, strerror(errno));
VECT_DESTROY(&v, struct opt_F_t, destroy_opt_F_cb, NULL);
}
/* PKGDATADIR is passed via -D when compiling. */
const char *pkgdatadir = PKGDATADIR;
if (pkgdatadir != NULL)
add_dir(&dirs, pkgdatadir, "");
if (VECT_PUSHBACK(&dirs, &delim) < 0)
goto fail;
goto again;
}
int
os_get_ltrace_conf_filenames(struct vect *retp)
{
char *homepath = NULL;
char *syspath = NULL;
#define FN ".ltrace.conf"
if (g_home_dir == NULL)
os_get_config_dirs(0, NULL);
if (g_home_dir != NULL) {
homepath = malloc(strlen(g_home_dir) + 1 + sizeof FN);
if (homepath == NULL
|| sprintf(homepath, "%s/%s", g_home_dir, FN) < 0) {
fail:
free(syspath);
free(homepath);
return -1;
}
}
/* SYSCONFDIR is passed via -D when compiling. */
const char *sysconfdir = SYSCONFDIR;
if (sysconfdir != NULL && *sysconfdir != '\0') {
/* No +1, we skip the initial period. */
syspath = malloc(strlen(sysconfdir) + sizeof FN);
if (syspath == NULL
|| sprintf(syspath, "%s/%s", sysconfdir, FN + 1) < 0)
goto fail;
}
if (VECT_PUSHBACK(retp, &homepath) < 0
|| VECT_PUSHBACK(retp, &syspath) < 0)
goto fail;
return 0;
}
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