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transmission/gtk/conf.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2007 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <sys/types.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include <libtransmission/transmission.h>
#include <libtransmission/bencode.h>
#include "conf.h"
#include "util.h"
#define CONF_SUBDIR "gtk"
#define FILE_LOCK "lock"
#define FILE_SOCKET "socket"
#define FILE_STATE "state"
#define FILE_STATE_TMP "state.tmp"
#define OLD_FILE_LOCK "gtk_lock" /* remove this after next release */
#define OLD_FILE_STATE "gtk_state"
#define PREF_SEP_LINE '\n'
static int
lockfile(const char *file, char **errstr);
static void
cf_removelocks(void);
static char *
cf_readfile(const char *file, const char *oldfile, gsize *len,
gboolean *usedold, char **errstr);
static void
cf_benc_append(benc_val_t *val, char type, int incsize);
static void
cf_writebenc(const char *file, const char *tmp, benc_val_t *data,
char **errstr);
static char *
getstateval(benc_val_t *state, char *line);
static char *gl_confdir = NULL;
static char *gl_old_confdir = NULL;
static char *gl_lockpath = NULL;
static char *gl_old_lockpath = NULL;
/* errstr may be NULL, this might be called before GTK is initialized */
static int
lockfile(const char *file, char **errstr) {
int fd, savederr;
struct flock lk;
if(NULL != errstr)
*errstr = NULL;
if(0 > (fd = open(file, O_RDWR | O_CREAT, 0666))) {
savederr = errno;
if(NULL != errstr)
*errstr = g_strdup_printf(_("Failed to open the file %s for writing:\n%s"),
file, strerror(errno));
errno = savederr;
return -1;
}
memset(&lk, 0, sizeof(lk));
lk.l_start = 0;
lk.l_len = 0;
lk.l_type = F_WRLCK;
lk.l_whence = SEEK_SET;
if(-1 == fcntl(fd, F_SETLK, &lk)) {
savederr = errno;
if(NULL != errstr) {
if(EAGAIN == errno)
*errstr = g_strdup_printf(_("Another copy of %s is already running."),
g_get_application_name());
else
*errstr = g_strdup_printf(_("Failed to lock the file %s:\n%s"),
file, strerror(errno));
}
close(fd);
errno = savederr;
return -1;
}
return fd;
}
/* errstr may be NULL, this might be called before GTK is initialized */
gboolean
cf_init(const char *dir, char **errstr) {
if(NULL != errstr)
*errstr = NULL;
gl_old_confdir = g_strdup(dir);
gl_confdir = g_build_filename(dir, CONF_SUBDIR, NULL);
if(mkdir_p(gl_confdir, 0777))
return TRUE;
if(NULL != errstr)
*errstr = g_strdup_printf(_("Failed to create the directory %s:\n%s"),
gl_confdir, strerror(errno));
return FALSE;
}
/* errstr may be NULL, this might be called before GTK is initialized */
gboolean
cf_lock(char **errstr) {
char *path = g_build_filename(gl_old_confdir, OLD_FILE_LOCK, NULL);
int fd = lockfile(path, errstr);
if(0 > fd)
g_free(path);
else {
gl_old_lockpath = path;
path = g_build_filename(gl_confdir, FILE_LOCK, NULL);
fd = lockfile(path, errstr);
if(0 > fd)
g_free(path);
else
gl_lockpath = path;
}
g_atexit(cf_removelocks);
return 0 <= fd;
}
static void
cf_removelocks( void )
{
g_unlink( gl_lockpath );
g_free( gl_lockpath );
g_unlink( gl_old_lockpath );
g_free( gl_old_lockpath );
}
char *
cf_sockname(void) {
return g_build_filename(gl_confdir, FILE_SOCKET, NULL);
}
static char *
cf_readfile(const char *file, const char *oldfile, gsize *len,
gboolean *usedold, char **errstr) {
char *path;
GIOChannel *io;
GError *err = NULL;
char *ret;
*errstr = NULL;
*usedold = FALSE;
ret = NULL;
err = NULL;
*len = 0;
path = g_build_filename(gl_confdir, file, NULL);
io = g_io_channel_new_file(path, "r", &err);
if(NULL != err && g_error_matches(err, G_FILE_ERROR, G_FILE_ERROR_NOENT)) {
g_error_free(err);
err = NULL;
g_free(path);
path = g_build_filename(gl_old_confdir, oldfile, NULL);
io = g_io_channel_new_file(path, "r", &err);
*usedold = TRUE;
}
if(NULL != err) {
if(!g_error_matches(err, G_FILE_ERROR, G_FILE_ERROR_NOENT))
*errstr = g_strdup_printf(
_("Failed to open the file %s for reading:\n%s"), path, err->message);
goto done;
}
g_io_channel_set_encoding(io, NULL, NULL);
if(G_IO_STATUS_ERROR == g_io_channel_read_to_end(io, &ret, len, &err)) {
*errstr = g_strdup_printf(
_("Error while reading from the file %s:\n%s"), path, err->message);
goto done;
}
done:
g_free (path);
g_clear_error( &err );
if(NULL != io)
g_io_channel_unref(io);
return ret;
}
/**
*** Prefs Files
**/
#define GROUP "general"
static char*
getPrefsFilename( void )
{
return g_build_filename( tr_getPrefsDirectory(),
CONF_SUBDIR, "prefs.ini", NULL );
}
static GKeyFile*
getPrefsKeyFile( void )
{
static GKeyFile * myKeyFile = NULL;
if( myKeyFile == NULL )
{
char * filename = getPrefsFilename( );
myKeyFile = g_key_file_new( );
g_key_file_load_from_file( myKeyFile, filename, 0, NULL );
g_free( filename );
}
return myKeyFile;
}
int
pref_int_get( const char * key )
{
return g_key_file_get_integer( getPrefsKeyFile( ), GROUP, key, NULL );
}
void
pref_int_set( const char * key, int value )
{
g_key_file_set_integer( getPrefsKeyFile( ), GROUP, key, value );
}
void
pref_int_set_default( const char * key, int value )
{
if( !g_key_file_has_key( getPrefsKeyFile( ), GROUP, key, NULL ) )
pref_int_set( key, value );
}
gboolean
pref_flag_get ( const char * key )
{
return g_key_file_get_boolean( getPrefsKeyFile( ), GROUP, key, NULL );
}
void
pref_flag_set( const char * key, gboolean value )
{
g_key_file_set_boolean( getPrefsKeyFile( ), GROUP, key, value );
}
void
pref_flag_set_default( const char * key, gboolean value )
{
if( !g_key_file_has_key( getPrefsKeyFile( ), GROUP, key, NULL ) )
pref_flag_set( key, value );
}
char*
pref_string_get( const char * key )
{
return g_key_file_get_string( getPrefsKeyFile( ), GROUP, key, NULL );
}
void
pref_string_set( const char * key, const char * value )
{
g_key_file_set_string( getPrefsKeyFile( ), GROUP, key, value );
}
void
pref_string_set_default( const char * key, const char * value )
{
if( !g_key_file_has_key( getPrefsKeyFile( ), GROUP, key, NULL ) )
pref_string_set( key, value );
}
void
pref_save(char **errstr)
{
gsize datalen;
GError * err = NULL;
char * data;
char * filename;
char * path;
filename = getPrefsFilename( );
path = g_path_get_dirname( filename );
mkdir_p( path, 0755 );
data = g_key_file_to_data( getPrefsKeyFile(), &datalen, &err );
if( !err ) {
GIOChannel * out = g_io_channel_new_file( filename, "w+", &err );
g_io_channel_write_chars( out, data, datalen, NULL, &err );
g_io_channel_unref( out );
}
if( errstr != NULL )
*errstr = err ? g_strdup( err->message ) : NULL;
g_clear_error( &err );
g_free( data );
g_free( path );
g_free( filename );
}
/**
***
**/
benc_val_t *
cf_loadstate(char **errstr) {
char *data, *line, *eol, *prog;
gsize len;
gboolean usedold;
benc_val_t *state, *torstate;
*errstr = NULL;
data = cf_readfile(FILE_STATE, OLD_FILE_STATE, &len, &usedold, errstr);
if(NULL != *errstr) {
g_assert(NULL == data);
return NULL;
}
if(NULL == data)
return NULL;
state = g_new0(benc_val_t, 1);
if(usedold || tr_bencLoad(data, len, state, NULL)) {
/* XXX all this evil compat code should go away at some point */
memset(state, 0, sizeof(benc_val_t));
state->type = TYPE_LIST;
for(line = data; NULL != (eol = strchr(line, PREF_SEP_LINE));
line = eol + 1) {
*eol = '\0';
if(g_utf8_validate(line, -1, NULL)) {
cf_benc_append(state, TYPE_DICT, 10);
torstate = state->val.l.vals + state->val.l.count - 1;
prog = line;
while(NULL != (prog = getstateval(torstate, prog)))
;
}
}
}
g_free(data);
return state;
}
static void
cf_benc_append(benc_val_t *val, char type, int incsize) {
if(++val->val.l.count > val->val.l.alloc) {
val->val.l.alloc += incsize;
val->val.l.vals = g_renew(benc_val_t, val->val.l.vals, val->val.l.alloc);
memset(val->val.l.vals + val->val.l.alloc - incsize, 0,
incsize * sizeof(benc_val_t));
}
val->val.l.vals[val->val.l.count-1].type = type;
}
static void
cf_writebenc(const char *file, const char *tmp, benc_val_t *data,
char **errstr) {
char *path = g_build_filename(gl_confdir, file, NULL);
char *pathtmp = g_build_filename(gl_confdir, tmp, NULL);
GIOChannel *io = NULL;
GError *err = NULL;
char *datastr;
int len;
gsize written;
*errstr = NULL;
err = NULL;
datastr = NULL;
io = g_io_channel_new_file(pathtmp, "w", &err);
if(NULL != err) {
*errstr = g_strdup_printf(_("Failed to open the file %s for writing:\n%s"),
pathtmp, err->message);
goto done;
}
g_io_channel_set_encoding(io, NULL, NULL);
len = 0;
datastr = tr_bencSaveMalloc(data, &len);
written = 0;
g_io_channel_write_chars(io, datastr, len, &written, &err);
if(NULL != err)
g_io_channel_flush(io, &err);
if(NULL != err) {
*errstr = g_strdup_printf(_("Error while writing to the file %s:\n%s"),
pathtmp, err->message);
goto done;
}
if(0 > rename(pathtmp, path)) {
*errstr = g_strdup_printf(_("Failed to rename the file %s to %s:\n%s"),
pathtmp, file, strerror(errno));
goto done;
}
done:
g_free(path);
g_free(pathtmp);
if(NULL != io)
g_io_channel_unref(io);
if(NULL != datastr)
free(datastr);
}
static gboolean
strbool( const char * str )
{
if( !str )
return FALSE;
switch(str[0]) {
case 'y': case 't': case 'Y': case '1': case 'j': case 'e':
return TRUE;
default:
if(0 == g_ascii_strcasecmp("on", str))
return TRUE;
break;
}
return FALSE;
}
static char *
getstateval(benc_val_t *state, char *line) {
char *start, *end;
/* skip any leading whitespace */
while(g_ascii_isspace(*line))
line++;
/* walk over the key, which may be alphanumerics as well as - or _ */
for(start = line; g_ascii_isalnum(*start)
|| '_' == *start || '-' == *start; start++)
;
/* they key must be immediately followed by an = */
if('=' != *start)
return NULL;
*(start++) = '\0';
/* then the opening quote for the value */
if('"' != *(start++))
return NULL;
/* walk over the value */
for(end = start; '\0' != *end && '"' != *end; end++)
/* skip over escaped quotes */
if('\\' == *end && '\0' != *(end + 1))
end++;
/* make sure we didn't hit the end of the string */
if('"' != *end)
return NULL;
*end = '\0';
/* if it's a key we recognize then save the data */
if(0 == strcmp(line, "torrent") || 0 == strcmp(line, "dir") ||
0 == strcmp(line, "paused")) {
cf_benc_append(state, TYPE_STR, 6);
state->val.l.vals[state->val.l.count-1].val.s.s = g_strdup(line);
state->val.l.vals[state->val.l.count-1].val.s.i = strlen(line);
if('p' == *line) {
cf_benc_append(state, TYPE_INT, 6);
state->val.l.vals[state->val.l.count-1].val.i = strbool(start);
} else {
cf_benc_append(state, TYPE_STR, 6);
state->val.l.vals[state->val.l.count-1].val.s.s = g_strdup(start);
state->val.l.vals[state->val.l.count-1].val.s.i = strlen(start);
}
}
/* return a pointer to just past the end of the value */
return end + 1;
}
void
cf_savestate(benc_val_t *state, char **errstr) {
*errstr = NULL;
cf_writebenc(FILE_STATE, FILE_STATE_TMP, state, errstr);
}
void
cf_freestate( benc_val_t * state )
{
if( NULL != state )
{
tr_bencFree( state );
g_free( state );
}
}
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