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rarconfig.c
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rarconfig.c
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/*
Copyright (C) 2009 Hans Beckerus ([email protected])
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 3 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, see <http://www.gnu.org/licenses/>.
This program take use of the freeware "Unrar C++ Library" (libunrar)
by Alexander Roshal and some extensions to it.
Unrar source may be used in any software to handle RAR archives
without limitations free of charge, but cannot be used to re-create
the RAR compression algorithm, which is proprietary. Distribution
of modified Unrar source in separate form or as a part of other
software is permitted, provided that it is clearly stated in
the documentation and source comments that the code may not be used
to develop a RAR (WinRAR) compatible archiver.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <limits.h>
#include <libgen.h>
#include <pthread.h>
#include "hashtable.h"
#include "version.hpp"
#include "rarconfig.h"
#define RARCONFIG_SZ 1024
struct parent_node {
off_t pos;
char *name;
};
struct child_node {
off_t pos;
char *name;
char *value;
};
struct alias_entry {
char *file;
char *alias;
};
struct config_entry {
int seek_length;
int save_eof;
wchar_t *password_w;
char *password;
struct alias_entry *aliases;
size_t n_aliases;
uint32_t mask;
};
/* Hash table handle */
static void *ht = NULL;
static pthread_mutex_t config_mutex = PTHREAD_MUTEX_INITIALIZER;
/*!
*****************************************************************************
*
****************************************************************************/
int rarconfig_getprop_int(const char *path, int prop)
{
struct hash_table_entry *hte;
pthread_mutex_lock(&config_mutex);
hte = ht ? hashtable_entry_get(ht, path) : NULL;
if (hte) {
struct config_entry *e = hte->user_data;
switch (prop) {
case RAR_SEEK_LENGTH_PROP:
pthread_mutex_unlock(&config_mutex);
return e->mask & RAR_SEEK_LENGTH_PROP
? e->seek_length : -1;
case RAR_SAVE_EOF_PROP:
pthread_mutex_unlock(&config_mutex);
return e->mask & RAR_SAVE_EOF_PROP
? e->save_eof : -1;
}
}
pthread_mutex_unlock(&config_mutex);
return -1;
}
/*!
*****************************************************************************
*
****************************************************************************/
const char *rarconfig_getprop_char(const char *path, int prop)
{
struct hash_table_entry *hte;
pthread_mutex_lock(&config_mutex);
hte = ht ? hashtable_entry_get(ht, path) : NULL;
if (hte) {
struct config_entry *e = hte->user_data;
switch (prop) {
case RAR_PASSWORD_PROP:
pthread_mutex_unlock(&config_mutex);
return e->mask & RAR_PASSWORD_PROP
? e->password : NULL;
}
}
pthread_mutex_unlock(&config_mutex);
return NULL;
}
/*!
*****************************************************************************
*
****************************************************************************/
const wchar_t *rarconfig_getprop_wchar(const char *path, int prop)
{
struct hash_table_entry *hte;
pthread_mutex_lock(&config_mutex);
hte = ht ? hashtable_entry_get(ht, path) : NULL;
if (hte) {
struct config_entry *e = hte->user_data;
switch (prop) {
case RAR_PASSWORD_PROP:
pthread_mutex_unlock(&config_mutex);
return e->mask & RAR_PASSWORD_PROP
? e->password_w : NULL;
}
}
pthread_mutex_unlock(&config_mutex);
return NULL;
}
/*!
*****************************************************************************
*
****************************************************************************/
const char *rarconfig_getalias(const char *path, const char *file)
{
struct hash_table_entry *hte;
pthread_mutex_lock(&config_mutex);
hte = ht ? hashtable_entry_get(ht, path) : NULL;
if (hte) {
size_t n;
struct config_entry *e = hte->user_data;
for (n = 0; n < e->n_aliases; n++) {
if (!strcmp(file, e->aliases[n].file)) {
char *alias = e->aliases[n].alias;
pthread_mutex_unlock(&config_mutex);
return alias;
}
}
}
pthread_mutex_unlock(&config_mutex);
return NULL;
}
/*!
*****************************************************************************
*
****************************************************************************/
__attribute__((unused))
static void __patch_alias(struct config_entry *e, const char *file,
const char *alias)
{
size_t n;
for (n = 0; n < e->n_aliases; n++) {
struct alias_entry *ax = &e->aliases[n];
char *sub = strstr(ax->alias, file);
if (sub && sub == ax->alias) {
size_t file_sz = strlen(file);
if (ax->alias[file_sz] == '/') {
size_t sz = strlen(ax->alias) -
file_sz + strlen(alias) + 1;
char *tmp = malloc(sz);
if (tmp) {
strcpy(tmp, alias);
strcat(tmp, ax->alias + file_sz);
free(ax->alias);
ax->alias = tmp;
}
}
}
}
}
/*!
*****************************************************************************
*
****************************************************************************/
static void __set_alias(struct config_entry *e, const char *file,
const char *alias)
{
e->aliases = realloc(e->aliases,
sizeof(struct alias_entry) * (e->n_aliases + 1));
e->aliases[e->n_aliases].file = strdup(file);
e->aliases[e->n_aliases].alias = strdup(alias);
#if 0
/* Check if any existing aliases need to be patched up */
__patch_alias(e, file, alias);
#endif
++e->n_aliases;
}
/*!
*****************************************************************************
*
****************************************************************************/
void rarconfig_setalias(const char *path, const char *file, const char *alias)
{
struct hash_table_entry *hte;
pthread_mutex_lock(&config_mutex);
hte = ht ? hashtable_entry_get(ht, path) : NULL;
if (hte)
__set_alias(hte->user_data, file, alias);
pthread_mutex_unlock(&config_mutex);
}
/*!
*****************************************************************************
*
****************************************************************************/
static struct parent_node *find_next_parent(FILE *fp, struct parent_node *p)
{
char s[LINE_MAX];
char line[LINE_MAX];
if (p)
fseek(fp, p->pos, SEEK_SET);
else
fseek(fp, 0L, SEEK_SET);
while (fgets(line, LINE_MAX, fp)) {
if (sscanf(line, " [ %[^]] ", s) == 1) {
p = malloc(sizeof(struct parent_node));
p->name = strdup(s);
p->pos = ftell(fp);
return p;
}
}
return NULL;
}
/*!
*****************************************************************************
*
****************************************************************************/
static void free_parent(struct parent_node *p)
{
if (p) {
free(p->name);
free(p);
}
}
/*!
*****************************************************************************
*
****************************************************************************/
static struct child_node *find_next_child(FILE *fp, struct parent_node *p,
struct child_node *cnode)
{
char s[LINE_MAX];
char v[LINE_MAX];
char line[LINE_MAX];
if (!cnode)
fseek(fp, p->pos, SEEK_SET);
else
fseek(fp, cnode->pos, SEEK_SET);
while (fgets(line, LINE_MAX, fp)) {
s[0] = 0;
if (sscanf(line, " %[^#!=]=%[^\n]", s, v) == 2) {
sscanf(s, "%s", s); /* trim white-spaces */
cnode = malloc(sizeof(struct child_node));
cnode->name = strdup(s);
cnode->value = strdup(v);
cnode->pos = ftell(fp);
return cnode;
} else {
sscanf(s, "%s", s); /* trim white-spaces */
if (s[0] == '[')
return NULL;
}
}
return NULL;
}
/*!
*****************************************************************************
*
****************************************************************************/
static void free_child(struct child_node *c)
{
if (c) {
free(c->name);
free(c->value);
free(c);
}
}
/*!
*****************************************************************************
*
****************************************************************************/
static void *__alloc()
{
struct config_entry *e;
e = malloc(sizeof(struct config_entry));
memset(e, 0, sizeof(struct config_entry));
return e;
}
/*!
*****************************************************************************
*
****************************************************************************/
static void __free(void *data)
{
struct config_entry *e = data;
free(e->password);
free(e->password_w);
while (e->n_aliases) {
--e->n_aliases;
free(e->aliases[e->n_aliases].file);
free(e->aliases[e->n_aliases].alias);
}
free(e->aliases);
free(e);
}
/*!
*****************************************************************************
*
****************************************************************************/
void rarconfig_destroy()
{
pthread_mutex_lock(&config_mutex);
if (ht) {
hashtable_destroy(ht);
ht = NULL;
}
pthread_mutex_unlock(&config_mutex);
}
/*!
*****************************************************************************
*
****************************************************************************/
static struct config_entry *alloc_entry(const char *path)
{
struct hash_table_entry *hte;
hte = hashtable_entry_alloc(ht, path);
if (hte)
return hte->user_data;
return NULL;
}
/*!
*****************************************************************************
*
****************************************************************************/
static void __entry_set_password(struct config_entry *e,
struct child_node *cnode)
{
size_t len;
wchar_t *wcs;
e->password = strdup(cnode->value);
len = mbstowcs(NULL, e->password, 0);
if (len != (size_t)-1) {
wcs = calloc(len + 1, sizeof(wchar_t));
if (wcs != NULL) {
(void)mbstowcs(wcs, e->password, len + 1);
e->password_w = wcsdup(wcs);
free(wcs);
}
}
e->mask |= RAR_PASSWORD_PROP;
}
/*!
*****************************************************************************
*
****************************************************************************/
static void __entry_set_seek_length(struct config_entry *e,
struct child_node *cnode)
{
e->seek_length = strtoul(cnode->value, NULL, 0);
e->mask |= RAR_SEEK_LENGTH_PROP;
}
/*!
*****************************************************************************
*
****************************************************************************/
static void __entry_set_save_eof(struct config_entry *e,
struct child_node *cnode)
{
if (!strcasecmp(cnode->value, "true")) {
e->save_eof = 1;
e->mask |= RAR_SAVE_EOF_PROP;
} else if (!strcasecmp(cnode->value, "false")) {
e->save_eof = 0;
e->mask |= RAR_SAVE_EOF_PROP;
}
}
/*!
*****************************************************************************
*
****************************************************************************/
static int __dirlevels(const char *path)
{
char *tmp = strdup(path);
char *tmp2 = tmp;
int count = 0;
while (strcmp(tmp, "/")) {
++count;
tmp = dirname(tmp);
}
free(tmp2);
return count;
}
/*!
*****************************************************************************
*
****************************************************************************/
static int __check_paths(const char *a, const char *b)
{
char *a_safe;
char *b_safe;
if (a[0] != '/' || b[0] != '/')
return 1;
if (strlen(a) < 2 || strlen(b) < 2)
return 1;
if (__dirlevels(a) != __dirlevels(b))
return 1;
/* Next check will prevent anything but changes to basename.
* This code might need to be revisted when support for aliasing
* of directories are added. */
a_safe = strdup(a);
b_safe = strdup(b);
if (strcmp(dirname(a_safe), dirname(b_safe))) {
free(a_safe);
free(b_safe);
return 1;
}
free(a_safe);
free(b_safe);
return 0;
}
/*!
*****************************************************************************
*
****************************************************************************/
static void __entry_set_alias(struct config_entry *e, struct child_node *cnode)
{
char *file = malloc(strlen(cnode->value) + 1);
char *alias = malloc(strlen(cnode->value) + 1);
if (sscanf(cnode->value, " \"%[^\"]%*[^,]%*[^\"]\" %[^\"]",
file, alias) == 2) {
if (__check_paths(file, alias))
goto out;
__set_alias(e, file, alias);
}
out:
free(file);
free(alias);
}
/*!
*****************************************************************************
*
****************************************************************************/
void rarconfig_init(const char *source, const char *cfg)
{
struct parent_node *p_next = NULL;
struct parent_node *p;
struct hash_table_ops ops = {
.alloc = __alloc,
.free = __free,
};
FILE *fp;
pthread_mutex_lock(&config_mutex);
if (ht) {
pthread_mutex_unlock(&config_mutex);
return;
}
if (!cfg) {
char *cfg_file = malloc(strlen(source) + 16);
strcpy(cfg_file, source);
strcat(cfg_file, "/.rarconfig");
fp = fopen(cfg_file, "r");
free(cfg_file);
} else {
fp = fopen(cfg, "r");
}
if (!fp) {
pthread_mutex_unlock(&config_mutex);
return;
}
ht = hashtable_init(RARCONFIG_SZ, &ops);
while ((p = find_next_parent(fp, p_next))) {
struct config_entry *e = alloc_entry(p->name);
struct child_node *cnode_next = NULL;
struct child_node *cnode;
while ((cnode = find_next_child(fp, p, cnode_next))) {
if (!strcasecmp(cnode->name, "save-eof"))
__entry_set_save_eof(e, cnode);
if (!strcasecmp(cnode->name, "seek-length"))
__entry_set_seek_length(e, cnode);
if (!strcasecmp(cnode->name, "password"))
__entry_set_password(e, cnode);
if (!strcasecmp(cnode->name, "alias"))
__entry_set_alias(e, cnode);
free_child(cnode_next);
cnode_next = cnode;
}
free_parent(p_next);
p_next = p;
}
pthread_mutex_unlock(&config_mutex);
fclose(fp);
}