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mpd/src/conf.c

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/* the Music Player Daemon (MPD)
* (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
* This project's homepage is: http://www.musicpd.org
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "conf.h"
#include "log.h"
#include "utils.h"
#include "buffer2array.h"
#include "list.h"
#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#define MAX_STRING_SIZE MAXPATHLEN+80
#define CONF_COMMENT '#'
#define CONF_BLOCK_BEGIN "{"
#define CONF_BLOCK_END "}"
#define CONF_REPEATABLE_MASK 0x01
#define CONF_BLOCK_MASK 0x02
typedef struct _configEntry {
unsigned char mask;
List * configParamList;
} ConfigEntry;
static List * configEntriesList = NULL;
static ConfigParam * newConfigParam(char * value, int line) {
ConfigParam * ret = malloc(sizeof(ConfigParam));
if(!value) ret->value = NULL;
else ret->value = strdup(value);
ret->line = line;
ret->numberOfBlockParams = 0;
ret->blockParams = NULL;
return ret;
}
static void freeConfigParam(ConfigParam * param) {
int i;
if(param->value) free(param->value);
for(i=0; i<param->numberOfBlockParams; i++) {
if(param->blockParams[i].name) {
free(param->blockParams[i].name);
}
if(param->blockParams[i].value) {
free(param->blockParams[i].value);
}
}
if(param->numberOfBlockParams) free(param->blockParams);
free(param);
}
ConfigEntry * newConfigEntry(int repeatable, int block) {
ConfigEntry * ret = malloc(sizeof(ConfigEntry));
ret->mask = 0;
ret->configParamList = makeList((ListFreeDataFunc *)freeConfigParam);
if(repeatable) ret->mask |= CONF_REPEATABLE_MASK;
if(block) ret->mask |= CONF_BLOCK_MASK;
return ret;
}
void freeConfigEntry(ConfigEntry * entry) {
freeList(entry->configParamList);
free(entry);
}
void registerConfigParam(char * name, int repeatable, int block) {
ConfigEntry * entry;
if(findInList(configEntriesList, name, NULL)) {
ERROR("config parameter \"%s\" already registered\n", name);
exit(EXIT_FAILURE);
}
entry = newConfigEntry(repeatable, block);
insertInList(configEntriesList, name, entry);
}
void initConf() {
configEntriesList = makeList((ListFreeDataFunc *)freeConfigEntry);
registerConfigParam(CONF_PORT, 0, 0);
registerConfigParam(CONF_MUSIC_DIR, 0, 0);
registerConfigParam(CONF_PLAYLIST_DIR, 0, 0);
registerConfigParam(CONF_LOG_FILE, 0, 0);
registerConfigParam(CONF_ERROR_FILE, 0, 0);
registerConfigParam(CONF_CONN_TIMEOUT, 0, 0);
registerConfigParam(CONF_MIXER_DEVICE, 0, 0);
registerConfigParam(CONF_MAX_CONN, 0, 0);
registerConfigParam(CONF_MAX_PLAYLIST_LENGTH, 0, 0);
registerConfigParam(CONF_BUFFER_BEFORE_PLAY, 0, 0);
registerConfigParam(CONF_MAX_COMMAND_LIST_SIZE, 0, 0);
registerConfigParam(CONF_MAX_OUTPUT_BUFFER_SIZE, 0, 0);
registerConfigParam(CONF_AUDIO_OUTPUT, 1, 1);
registerConfigParam(CONF_SAVE_ABSOLUTE_PATHS, 0, 0);
registerConfigParam(CONF_BIND_TO_ADDRESS, 1, 0);
registerConfigParam(CONF_MIXER_TYPE, 0, 0);
registerConfigParam(CONF_STATE_FILE, 0, 0);
registerConfigParam(CONF_USER, 0, 0);
registerConfigParam(CONF_DB_FILE, 0, 0);
registerConfigParam(CONF_LOG_LEVEL, 0, 0);
registerConfigParam(CONF_MIXER_CONTROL, 0, 0);
registerConfigParam(CONF_AUDIO_WRITE_SIZE, 0, 0);
registerConfigParam(CONF_FS_CHARSET, 0, 0);
registerConfigParam(CONF_PASSWORD, 1, 0);
registerConfigParam(CONF_DEFAULT_PERMS, 0, 0);
registerConfigParam(CONF_AUDIO_BUFFER_SIZE, 0, 0);
registerConfigParam(CONF_REPLAYGAIN, 0, 0);
registerConfigParam(CONF_AUDIO_OUTPUT_FORMAT, 0, 0);
registerConfigParam(CONF_HTTP_PROXY_HOST, 0, 0);
registerConfigParam(CONF_HTTP_PROXY_PORT, 0, 0);
registerConfigParam(CONF_HTTP_PROXY_USER, 0, 0);
registerConfigParam(CONF_HTTP_PROXY_PASSWORD, 0, 0);
registerConfigParam(CONF_REPLAYGAIN_PREAMP, 0, 0);
registerConfigParam(CONF_ID3V1_ENCODING, 0, 0);
}
static void addBlockParam(ConfigParam * param, char * name, char * value,
int line)
{
param->numberOfBlockParams++;
param->blockParams = realloc(param->blockParams,
param->numberOfBlockParams*sizeof(BlockParam));
param->blockParams[param->numberOfBlockParams-1].name = strdup(name);
param->blockParams[param->numberOfBlockParams-1].value = strdup(value);
param->blockParams[param->numberOfBlockParams-1].line = line;
}
static ConfigParam * readConfigBlock(FILE * fp, int * count, char * string) {
ConfigParam * ret = newConfigParam(NULL, *count);
char ** array;
int i;
int numberOfArgs;
int argsMinusComment;
while(myFgets(string, MAX_STRING_SIZE ,fp)) {
(*count)++;
numberOfArgs = buffer2array(string, &array);
for(i=0; i<numberOfArgs; i++) {
if(array[i][0] == CONF_COMMENT) break;
}
argsMinusComment = i;
if(0 == argsMinusComment) continue;
if(1 == argsMinusComment &&
0 == strcmp(array[0], CONF_BLOCK_END))
{
break;
}
if(2 != argsMinusComment) {
ERROR("improperly formatted config file at line %i:"
" %s\n", *count, string);
exit(EXIT_FAILURE);
}
if(0 == strcmp(array[0], CONF_BLOCK_BEGIN) ||
0 == strcmp(array[1], CONF_BLOCK_BEGIN) ||
0 == strcmp(array[0], CONF_BLOCK_END) ||
0 == strcmp(array[1], CONF_BLOCK_END))
{
ERROR("improperly formatted config file at line %i:"
" %s\n", count, string);
ERROR("in block begging at line %i\n", ret->line);
exit(EXIT_FAILURE);
}
addBlockParam(ret, array[0], array[1], *count);
freeArgArray(array, numberOfArgs);
}
return ret;
}
void readConf(char * file) {
FILE * fp;
char string[MAX_STRING_SIZE+1];
char ** array;
int i;
int numberOfArgs;
int argsMinusComment;
int count = 0;
ConfigEntry * entry;
void * voidPtr;
ConfigParam * param;
if(!(fp=fopen(file,"r"))) {
ERROR("problems opening file %s for reading\n",file);
exit(EXIT_FAILURE);
}
while(myFgets(string, MAX_STRING_SIZE, fp)) {
count++;
numberOfArgs = buffer2array(string, &array);
for(i=0; i<numberOfArgs; i++) {
if(array[i][0] == CONF_COMMENT) break;
}
argsMinusComment = i;
if(0 == argsMinusComment) continue;
if(2 != argsMinusComment) {
ERROR("improperly formatted config file at line %i:"
" %s\n", count, string);
exit(EXIT_FAILURE);
}
if(!findInList(configEntriesList, array[0], &voidPtr)) {
ERROR("unrecognized paramater in config file at line "
"%i: %s\n", count, string);
exit(EXIT_FAILURE);
}
entry = (ConfigEntry *) voidPtr;
if( !(entry->mask & CONF_REPEATABLE_MASK) &&
entry->configParamList->numberOfNodes)
{
param = entry->configParamList->firstNode->data;
ERROR("config paramter \"%s\" is first defined on line "
"%i and redefined on line %i\n",
array[0], param->line, count);
exit(EXIT_FAILURE);
}
if(entry->mask & CONF_BLOCK_MASK) {
if(0 != strcmp(array[1], CONF_BLOCK_BEGIN)) {
ERROR("improperly formatted config file at "
"line %i: %s\n", count, string);
exit(EXIT_FAILURE);
}
param = readConfigBlock(fp, &count, string);
}
else param = newConfigParam(array[1], count);
insertInListWithoutKey(entry->configParamList, param);
freeArgArray(array, numberOfArgs);
}
}
ConfigParam * getNextConfigParam(char * name, ConfigParam * last) {
void * voidPtr;
ConfigEntry * entry;
ListNode * node;
ConfigParam * param;
if(!findInList(configEntriesList, name, &voidPtr)) return NULL;
entry = voidPtr;
node = entry->configParamList->firstNode;
if(last) {
while(node!=NULL) {
param = node->data;
node = node->nextNode;
if(param == last) break;
}
}
if(node == NULL) return NULL;
param = node->data;
return param;
}
char * getConfigParamValue(char * name) {
ConfigParam * param = getConfigParam(name);
if(!param) return NULL;
return param->value;
}
char * forceAndGetConfigParamValue(char * name) {
ConfigParam * param = getConfigParam(name);
if(!param) {
ERROR("\"%s\" not found in config file\n", name);
exit(EXIT_FAILURE);
}
return param->value;
}
BlockParam * getBlockParam(ConfigParam * param, char * name) {
BlockParam * ret = NULL;
int i;
for(i = 0; i < param->numberOfBlockParams; i++) {
if(0 == strcmp(name, param->blockParams[i].name)) {
if(ret) {
ERROR("\"%s\" first defined on line %i, and "
"redefined on line %i\n", name,
ret->line, param->blockParams[i].line);
}
ret = param->blockParams+i;
}
}
return ret;
}
char * parseConfigFilePath(char * name, int force) {
ConfigParam * param = getConfigParam(name);
char * path;
if(!param && force) {
ERROR("config parameter \"%s\" not found\n", name);
exit(EXIT_FAILURE);
}
if(!param) return NULL;
path = param->value;
if(path[0] != '/' && path[0] != '~') {
ERROR("\"%s\" is not an absolute path at line %i\n",
param->value, param->line);
exit(EXIT_FAILURE);
}
// Parse ~ in path
else if(path[0] == '~') {
struct passwd * pwd = NULL;
char * newPath;
int pos = 1;
if(path[1]=='/' || path[1] == '\0') {
ConfigParam * userParam = getConfigParam(CONF_USER);
if(userParam) {
pwd = getpwnam(userParam->value);
if(!pwd) {
ERROR("no such user %s at line %i\n",
userParam->value,
userParam->line);
exit(EXIT_FAILURE);
}
}
else {
uid_t uid = geteuid();
if((pwd = getpwuid(uid)) == NULL) {
ERROR("problems getting passwd entry "
"for current user\n");
exit(EXIT_FAILURE);
}
}
}
else {
int foundSlash = 0;
char * ch = path+1;
for(;*ch!='\0' && *ch!='/';ch++);
if(*ch=='/') foundSlash = 1;
* ch = '\0';
pos+= ch-path+1;
if((pwd = getpwnam(path+1)) == NULL) {
ERROR("user \"%s\" not found at line %i\n",
path+1, param->line);
exit(EXIT_FAILURE);
}
if(foundSlash) *ch = '/';
}
newPath = malloc(strlen(pwd->pw_dir)+strlen(path+pos)+1);
strcpy(newPath, pwd->pw_dir);
strcat(newPath, path+pos);
free(param->value);
param->value = newPath;
}
return param->value;
}
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