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transmission/gtk/conf.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005-2006 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 "conf.h"
#include "util.h"
#define CONF_SUBDIR "gtk"
#define FILE_LOCK "lock"
#define FILE_SOCKET "socket"
#define FILE_PREFS "prefs"
#define FILE_PREFS_TMP "prefs.tmp"
#define FILE_STATE "state"
#define FILE_STATE_TMP "state.tmp"
#define OLD_FILE_LOCK "gtk_lock" /* remove this after next release */
#define OLD_FILE_PREFS "gtk_prefs"
#define OLD_FILE_STATE "gtk_state"
#define PREF_SEP_KEYVAL '\t'
#define PREF_SEP_LINE '\n'
#define STATE_SEP '\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 gboolean
writefile_traverse(gpointer key, gpointer value, gpointer data);
static char *
getstateval(benc_val_t *state, char *line);
static char *gl_confdir = NULL;
static char *gl_old_confdir = NULL;
static GTree *gl_prefs = 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;
}
bzero(&lk, 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) {
if(NULL != gl_lockpath) {
unlink(gl_lockpath);
g_free(gl_lockpath);
}
if(NULL != gl_old_lockpath) {
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;
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:
if(NULL != err)
g_error_free(err);
if(NULL != io)
g_io_channel_unref(io);
return ret;
}
void
cf_loadprefs(char **errstr) {
char *data, *line, *eol, *sep, *key;
gsize len;
benc_val_t val;
gboolean usedold;
int ii;
*errstr = NULL;
if(NULL != gl_prefs)
g_tree_destroy(gl_prefs);
gl_prefs = g_tree_new_full((GCompareDataFunc)g_ascii_strcasecmp, NULL,
g_free, g_free);
data = cf_readfile(FILE_PREFS, OLD_FILE_PREFS, &len, &usedold, errstr);
if(NULL != *errstr) {
g_assert(NULL == data);
return;
}
if(NULL == data)
return;
bzero(&val, sizeof(val));
if(!usedold && !tr_bencLoad(data, len, &val, NULL)) {
if(TYPE_DICT == val.type) {
key = NULL;
for(ii = 0; ii < val.val.l.count; ii++) {
if(NULL == key) {
g_assert(TYPE_STR == val.val.l.vals[ii].type);
key = val.val.l.vals[ii].val.s.s;
} else {
if(TYPE_INT == val.val.l.vals[ii].type)
g_tree_insert(gl_prefs, g_strdup(key),
g_strdup_printf("%"PRIu64, val.val.l.vals[ii].val.i));
else if(TYPE_STR == val.val.l.vals[ii].type)
g_tree_insert(gl_prefs, g_strdup(key),
g_strdup(val.val.l.vals[ii].val.s.s));
key = NULL;
}
}
}
} else {
/* XXX remove this in a release or two */
for(line = data; NULL != (eol = strchr(line, PREF_SEP_LINE));
line = eol + 1) {
*eol = '\0';
if(g_utf8_validate(line, -1, NULL) &&
NULL != (sep = strchr(line, PREF_SEP_KEYVAL))) {
*sep = '\0';
g_tree_insert(gl_prefs, g_strcompress(line), g_strcompress(sep+1));
}
}
cf_saveprefs(errstr);
}
g_free(data);
}
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 */
tr_bencFree(state);
bzero(state, 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);
bzero(val->val.l.vals + val->val.l.alloc - incsize,
incsize * sizeof(benc_val_t));
}
val->val.l.vals[val->val.l.count-1].type = type;
}
const char *
cf_getpref(const char *name) {
g_assert(NULL != gl_prefs);
return g_tree_lookup(gl_prefs, name);
}
void
cf_setpref(const char *name, const char *value) {
g_assert(NULL != gl_prefs);
g_tree_insert(gl_prefs, g_strdup(name), g_strdup(value));
}
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;
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);
}
void
cf_saveprefs(char **errstr) {
benc_val_t val;
benc_val_t *ptr;
*errstr = NULL;
bzero(&val, sizeof(val));
val.type = TYPE_DICT;
val.val.l.alloc = val.val.l.count = g_tree_nnodes(gl_prefs) * 2;
val.val.l.vals = g_new0(benc_val_t, val.val.l.alloc);
ptr = val.val.l.vals;
g_tree_foreach(gl_prefs, writefile_traverse, &ptr);
g_assert(ptr - val.val.l.vals == val.val.l.alloc);
cf_writebenc(FILE_PREFS, FILE_PREFS_TMP, &val, errstr);
tr_bencFree(&val);
}
static gboolean
writefile_traverse(gpointer key, gpointer value, gpointer data) {
benc_val_t **ptr = data;
benc_val_t *bkey = *ptr;
benc_val_t *bval = (*ptr) + 1;
*ptr = (*ptr) + 2;
bkey->type = TYPE_STR;
bkey->val.s.s = g_strdup(key);
bkey->val.s.i = strlen(key);
bval->type = TYPE_STR;
bval->val.s.s = g_strdup(value);
bval->val.s.i = strlen(value);
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) {
tr_bencFree(state);
g_free(state);
}
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