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asterisk/config.c

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/*
* Asterisk -- A telephony toolkit for Linux.
*
* Configuration File Parser
*
* Copyright (C) 1999-2004, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#define AST_INCLUDE_GLOB 1
#ifdef AST_INCLUDE_GLOB
#ifdef __OSX__
#define GLOB_ABORTED GLOB_ABEND
#endif
# include <glob.h>
#endif
#include <asterisk/config.h>
#include <asterisk/config_pvt.h>
#include <asterisk/cli.h>
#include <asterisk/lock.h>
#include <asterisk/options.h>
#include <asterisk/logger.h>
#include <asterisk/utils.h>
#include "asterisk.h"
#include "astconf.h"
#define MAX_NESTED_COMMENTS 128
#define COMMENT_START ";--"
#define COMMENT_END "--;"
#define COMMENT_META ';'
#define COMMENT_TAG '-'
static int ast_cust_config=0;
struct ast_config *(*global_load_func)(const char *dbname, const char *table, const char *, struct ast_config *,struct ast_category **,struct ast_variable **,int);
static struct ast_config_map {
struct ast_config_map *next;
char *name;
char *driver;
char *database;
char *table;
char stuff[0];
} *maps = NULL;
AST_MUTEX_DEFINE_STATIC(ast_cust_config_lock);
static struct ast_config_reg *ast_cust_config_list;
static char *config_conf_file = "extconfig.conf";
void ast_destroy_realtime(struct ast_variable *v)
{
struct ast_variable *vn;
while(v) {
vn = v;
v = v->next;
free(vn);
}
}
void ast_category_destroy(struct ast_category *cat)
{
ast_destroy_realtime(cat->root);
free(cat);
}
void ast_destroy(struct ast_config *ast)
{
struct ast_category *cat, *catn;
if (!ast)
return;
cat = ast->root;
while(cat) {
ast_destroy_realtime(cat->root);
catn = cat;
cat = cat->next;
free(catn);
}
free(ast);
}
int ast_true(const char *s)
{
if (!s)
return 0;
/* Determine if this is a true value */
if (!strcasecmp(s, "yes") ||
!strcasecmp(s, "true") ||
!strcasecmp(s, "y") ||
!strcasecmp(s, "t") ||
!strcasecmp(s, "1") ||
!strcasecmp(s, "on"))
return -1;
return 0;
}
int ast_false(const char *s)
{
if (!s)
return 0;
/* Determine if this is a false value */
if (!strcasecmp(s, "no") ||
!strcasecmp(s, "false") ||
!strcasecmp(s, "n") ||
!strcasecmp(s, "f") ||
!strcasecmp(s, "0") ||
!strcasecmp(s, "off"))
return -1;
return 0;
}
struct ast_variable *ast_variable_browse(struct ast_config *config, char *category)
{
struct ast_category *cat;
cat = config->root;
while(cat) {
if (cat->name == category)
return cat->root;
cat = cat->next;
}
cat = config->root;
while(cat) {
if (!strcasecmp(cat->name, category))
return cat->root;
cat = cat->next;
}
return NULL;
}
char *ast_variable_retrieve(struct ast_config *config, char *category, char *value)
{
struct ast_variable *v;
if (category) {
v = ast_variable_browse(config, category);
while (v) {
if (value == v->name)
return v->value;
v=v->next;
}
v = ast_variable_browse(config, category);
while (v) {
if (!strcasecmp(value, v->name))
return v->value;
v=v->next;
}
} else {
struct ast_category *cat;
cat = config->root;
while(cat) {
v = cat->root;
while (v) {
if (!strcasecmp(value, v->name))
return v->value;
v=v->next;
}
cat = cat->next;
}
}
return NULL;
}
int ast_category_exist(struct ast_config *config, char *category_name)
{
struct ast_category *category = NULL;
category = config->root;
while(category) {
if (!strcasecmp(category->name,category_name))
return 1;
category = category->next;
}
return 0;
}
static struct ast_config_reg *get_ast_cust_config_keyword(const char *name, char *database, int dbsiz, char *table, int tabsiz)
{
struct ast_config_reg *reg,*ret=NULL;
struct ast_config_map *map;
ast_mutex_lock(&ast_cust_config_lock);
map = maps;
while(map) {
if (!strcasecmp(name, map->name)) {
strncpy(database, map->database, dbsiz - 1);
if (map->table)
strncpy(table, map->table, tabsiz - 1);
else
strncpy(table, name, tabsiz - 1);
break;
}
map = map->next;
}
if (map) {
for (reg=ast_cust_config_list;reg && !ret;reg=reg->next) {
if (!strcmp(reg->name,map->driver))
ret=reg;
}
}
ast_mutex_unlock(&ast_cust_config_lock);
return ret;
}
void ast_config_destroy_all(void)
{
struct ast_config_reg *key;
ast_mutex_lock(&ast_cust_config_lock);
for (key=ast_cust_config_list;key;key=key->next) {
ast_config_deregister(key);
}
ast_cust_config_list = NULL;
ast_mutex_unlock(&ast_cust_config_lock);
}
static struct ast_config_reg *get_config_registrations(void)
{
return ast_cust_config_list;
}
static int cfg_process(struct ast_config *tmp, struct ast_category **_tmpc, struct ast_variable **_last, char *buf, int lineno, const char *configfile, int includelevel )
{
char *c;
char *cur;
char *arg=NULL;
struct ast_variable *v;
int object;
cur = ast_strip(buf);
if (!ast_strlen_zero(cur)) {
/* Actually parse the entry */
if (cur[0] == '[') {
/* A category header */
c = strchr(cur, ']');
if (c) {
*c = 0;
*_tmpc = malloc(sizeof(struct ast_category));
if (!*_tmpc) {
ast_destroy(tmp);
ast_log(LOG_WARNING,
"Out of memory, line %d\n", lineno);
return -1;
}
memset(*_tmpc, 0, sizeof(struct ast_category));
strncpy((*_tmpc)->name, cur+1, sizeof((*_tmpc)->name) - 1);
(*_tmpc)->root = NULL;
if (!tmp->prev)
tmp->root = *_tmpc;
else
tmp->prev->next = *_tmpc;
tmp->prev = *_tmpc;
*_last = NULL;
} else {
ast_log(LOG_WARNING,
"parse error: no closing ']', line %d of %s\n", lineno, configfile);
}
} else if (cur[0] == '#') {
/* A directive */
cur++;
c = cur;
while(*c && (*c > 32)) c++;
if (*c) {
*c = '\0';
c++;
/* Find real argument */
while(*c && (*c < 33)) c++;
if (!*c)
c = NULL;
} else
c = NULL;
if (!strcasecmp(cur, "include")) {
/* A #include */
if (c) {
while((*c == '<') || (*c == '>') || (*c == '\"')) c++;
/* Get rid of leading mess */
cur = c;
while (!ast_strlen_zero(cur)) {
c = cur + strlen(cur) - 1;
if ((*c == '>') || (*c == '<') || (*c == '\"'))
*c = '\0';
else
break;
}
if((c = strchr(cur,':'))) {
*c = '\0';
c++;
arg = c;
}
if (includelevel < MAX_INCLUDE_LEVEL) {
if(arg && cur) {
ast_log(LOG_WARNING, "Including files with explicit config engine no longer permitted. Please use extconfig.conf to specify all mappings\n");
} else {
if (!ast_internal_load(cur, tmp, _tmpc, _last, includelevel + 1))
return -1;
}
} else
ast_log(LOG_WARNING, "Maximum Include level (%d) exceeded\n", includelevel);
} else
ast_log(LOG_WARNING, "Directive '#include' needs an argument (filename) at line %d of %s\n", lineno, configfile);
/* Strip off leading and trailing "'s and <>'s */
}
else
ast_log(LOG_WARNING, "Unknown directive '%s' at line %d of %s\n", cur, lineno, configfile);
} else {
/* Just a line (variable = value) */
if (!*_tmpc) {
ast_log(LOG_WARNING,
"parse error: No category context for line %d of %s\n", lineno, configfile);
ast_destroy(tmp);
return -1;
}
c = strchr(cur, '=');
if (c) {
*c = 0;
c++;
/* Ignore > in => */
if (*c== '>') {
object = 1;
c++;
} else
object = 0;
v = ast_new_variable(ast_strip(cur), ast_strip(c));
if (v) {
v->next = NULL;
v->lineno = lineno;
v->object = object;
/* Put and reset comments */
v->blanklines = 0;
if (*_last)
(*_last)->next = v;
else
(*_tmpc)->root = v;
*_last = v;
} else {
ast_destroy(tmp);
ast_log(LOG_WARNING, "Out of memory, line %d\n", lineno);
return -1;
}
} else {
ast_log(LOG_WARNING, "No '=' (equal sign) in line %d of %s\n", lineno, configfile);
}
}
}
return 0;
}
int ast_save(char *configfile, struct ast_config *cfg, char *generator)
{
FILE *f;
char fn[256];
char date[256]="";
time_t t;
struct ast_variable *var;
struct ast_category *cat;
int blanklines = 0;
if (configfile[0] == '/') {
strncpy(fn, configfile, sizeof(fn)-1);
} else {
snprintf(fn, sizeof(fn), "%s/%s", AST_CONFIG_DIR, configfile);
}
time(&t);
strncpy(date, ctime(&t), sizeof(date) - 1);
if ((f = fopen(fn, "w"))) {
if ((option_verbose > 1) && !option_debug)
ast_verbose( VERBOSE_PREFIX_2 "Saving '%s': ", fn);
fprintf(f, ";!\n");
fprintf(f, ";! Automatically generated configuration file\n");
fprintf(f, ";! Filename: %s (%s)\n", configfile, fn);
fprintf(f, ";! Generator: %s\n", generator);
fprintf(f, ";! Creation Date: %s", date);
fprintf(f, ";!\n");
cat = cfg->root;
while(cat) {
/* Dump section with any appropriate comment */
fprintf(f, "[%s]\n", cat->name);
var = cat->root;
while(var) {
if (var->sameline)
fprintf(f, "%s %s %s ; %s\n", var->name, (var->object ? "=>" : "="), var->value, var->sameline->cmt);
else
fprintf(f, "%s %s %s\n", var->name, (var->object ? "=>" : "="), var->value);
if (var->blanklines) {
blanklines = var->blanklines;
while (blanklines) {
fprintf(f, "\n");
blanklines--;
}
}
var = var->next;
}
#if 0
/* Put an empty line */
fprintf(f, "\n");
#endif
cat = cat->next;
}
} else {
if (option_debug)
printf("Unable to open for writing: %s\n", fn);
else if (option_verbose > 1)
printf( "Unable to write (%s)", strerror(errno));
return -1;
}
fclose(f);
return 0;
}
struct ast_variable *ast_load_realtime(const char *family, ...)
{
struct ast_config_reg *reg;
char db[256]="";
char table[256]="";
struct ast_variable *res=NULL;
va_list ap;
va_start(ap, family);
reg = get_ast_cust_config_keyword(family, db, sizeof(db), table, sizeof(table));
if (reg && reg->realtime_func)
res = reg->realtime_func(db, table, ap);
va_end(ap);
return res;
}
struct ast_config *ast_load_realtime_multientry(const char *family, ...)
{
struct ast_config_reg *reg;
char db[256]="";
char table[256]="";
struct ast_config *res=NULL;
va_list ap;
va_start(ap, family);
reg = get_ast_cust_config_keyword(family, db, sizeof(db), table, sizeof(table));
if (reg && reg->realtime_multi_func)
res = reg->realtime_multi_func(db, table, ap);
va_end(ap);
return res;
}
int ast_update_realtime(const char *family, const char *keyfield, const char *lookup, ...)
{
struct ast_config_reg *reg;
int res = -1;
char db[256]="";
char table[256]="";
va_list ap;
va_start(ap, lookup);
reg = get_ast_cust_config_keyword(family, db, sizeof(db), table, sizeof(table));
if (reg && reg->update_func)
res = reg->update_func(db, table, keyfield, lookup, ap);
va_end(ap);
return res;
}
struct ast_config *ast_internal_load(const char *configfile, struct ast_config *tmp, struct ast_category **_tmpc, struct ast_variable **_last, int includelevel)
{
char fn[256];
char buf[8192];
char db[256];
char table[256];
FILE *f;
int lineno=0;
int master=0;
int comment = 0, nest[MAX_NESTED_COMMENTS];
struct ast_config_reg *reg=NULL;
struct ast_config *(*load_func)(const char *database, const char *table, const char *, struct ast_config *,struct ast_category **,struct ast_variable **,int);
char *comment_p, *process_buf, *new_buf=NULL;
load_func=NULL;
if (strcmp(configfile,config_conf_file) && strcmp(configfile,"asterisk.conf") && ast_cust_config_list) {
if (global_load_func) {
load_func = global_load_func;
} else {
reg = get_ast_cust_config_keyword(configfile, db, sizeof(db), table, sizeof(table));
if (reg && reg->static_func) {
load_func = reg->static_func;
} else {
reg = get_ast_cust_config_keyword(configfile, db, sizeof(db), table, sizeof(table));
if (reg && reg->static_func)
global_load_func = load_func = reg->static_func;
}
}
if (load_func) {
ast_log(LOG_NOTICE,"Loading Config %s via %s engine\n",configfile,reg && reg->name ? reg->name : "global");
if((tmp = load_func(db, table, configfile,tmp, _tmpc, _last, includelevel)))
return tmp;
}
}
if (configfile[0] == '/') {
strncpy(fn, configfile, sizeof(fn)-1);
} else {
snprintf(fn, sizeof(fn), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, configfile);
}
#ifdef AST_INCLUDE_GLOB
{
int glob_ret;
glob_t globbuf;
globbuf.gl_offs = 0; /* initialize it to silence gcc */
#ifdef SOLARIS
glob_ret = glob(fn, GLOB_NOCHECK, NULL, &globbuf);
#else
glob_ret = glob(fn, GLOB_NOMAGIC|GLOB_BRACE, NULL, &globbuf);
#endif
if (glob_ret == GLOB_NOSPACE)
ast_log(LOG_WARNING,
"Glob Expansion of pattern '%s' failed: Not enough memory\n", fn);
else if (glob_ret == GLOB_ABORTED)
ast_log(LOG_WARNING,
"Glob Expansion of pattern '%s' failed: Read error\n", fn);
else {
/* loop over expanded files */
int i;
for (i=0; i<globbuf.gl_pathc; i++) {
strncpy(fn, globbuf.gl_pathv[i], sizeof(fn)-1);
#endif
if ((option_verbose > 1) && !option_debug) {
ast_verbose( VERBOSE_PREFIX_2 "Parsing '%s': ", fn);
fflush(stdout);
}
if ((f = fopen(fn, "r"))) {
if (option_debug)
ast_log(LOG_DEBUG, "Parsing %s\n", fn);
else if (option_verbose > 2)
ast_verbose( "Found\n");
if (!tmp) {
if((tmp = malloc(sizeof(struct ast_config)))) {
memset(tmp, 0, sizeof(struct ast_config));
master = 1;
}
}
if (tmp) {
while(!feof(f)) {
lineno++;
if (fgets(buf, sizeof(buf), f)) {
new_buf = buf;
if (comment)
process_buf = NULL;
else
process_buf = buf;
while ((comment_p = strchr(new_buf, COMMENT_META))) {
if ((comment_p > new_buf) && (*(comment_p-1) == '\\')) {
/* Yuck, gotta memmove */
memmove(comment_p - 1, comment_p, strlen(comment_p) + 1);
new_buf = comment_p;
} else if(comment_p[1] == COMMENT_TAG && comment_p[2] == COMMENT_TAG && (comment_p[3] != '-')) {
/* Meta-Comment start detected ";--" */
if (comment < MAX_NESTED_COMMENTS) {
*comment_p = '\0';
new_buf = comment_p + 3;
comment++;
nest[comment-1] = lineno;
} else {
ast_log(LOG_ERROR, "Maximum nest limit of %d reached.\n", MAX_NESTED_COMMENTS);
}
} else if ((comment_p >= new_buf + 2) &&
(*(comment_p - 1) == COMMENT_TAG) &&
(*(comment_p - 2) == COMMENT_TAG)) {
/* Meta-Comment end detected */
comment--;
new_buf = comment_p + 1;
if (!comment) {
/* Back to non-comment now */
if (process_buf) {
/* Actually have to move what's left over the top, then continue */
char *oldptr;
oldptr = process_buf + strlen(process_buf);
memmove(oldptr, new_buf, strlen(new_buf) + 1);
new_buf = oldptr;
} else
process_buf = new_buf;
}
} else {
if (!comment) {
/* If ; is found, and we are not nested in a comment,
we immediately stop all comment processing */
*comment_p = '\0';
new_buf = comment_p;
} else
new_buf = comment_p + 1;
}
}
if (process_buf && cfg_process(tmp, _tmpc, _last, process_buf, lineno, fn, includelevel)) {
tmp = NULL;
break;
}
}
}
} else
ast_log(LOG_WARNING, "Out of memory\n");
fclose(f);
} else { /* can't open file */
if (option_debug)
ast_log(LOG_DEBUG, "No file to parse: %s\n", fn);
else if (option_verbose > 2)
ast_verbose( "Not found (%s)\n", strerror(errno));
}
if (comment) {
ast_log(LOG_WARNING,"Unterminated comment detected beginning on line %d\n", nest[comment]);
}
#ifdef AST_INCLUDE_GLOB
if (!tmp)
break;
}
globfree(&globbuf);
}
}
#endif
return tmp;
}
int ast_config_register(struct ast_config_reg *new)
{
struct ast_config_reg *ptr;
ast_mutex_lock(&ast_cust_config_lock);
if (!ast_cust_config_list) {
ast_cust_config_list = new;
} else {
for(ptr=ast_cust_config_list;ptr->next;ptr=ptr->next);
ptr->next = new;
}
ast_mutex_unlock(&ast_cust_config_lock);
ast_log(LOG_NOTICE,"Registered Config Engine %s\n",new->name);
return 1;
}
int ast_config_deregister(struct ast_config_reg *del)
{
struct ast_config_reg *ptr=NULL,*last=NULL;
ast_mutex_lock(&ast_cust_config_lock);
for (ptr=ast_cust_config_list;ptr;ptr=ptr->next) {
if (ptr == del) {
if (last && ptr->next) {
last->next = ptr->next;
} else if (last && ! ptr->next) {
last->next = NULL;
} else if (!last && ptr->next) {
ast_cust_config_list = ptr->next;
} else if (!last && !ptr->next) {
ast_cust_config_list = NULL;
}
}
last = ptr;
}
ast_mutex_unlock(&ast_cust_config_lock);
return 0;
}
int ast_cust_config_active(void) {
return (ast_cust_config >0) ? 1 : 0;
}
struct ast_config *ast_load(char *configfile)
{
struct ast_category *tmpc=NULL;
struct ast_variable *last = NULL;
return ast_internal_load(configfile, NULL, &tmpc, &last, 0);
}
void ast_category_append(struct ast_config *config, struct ast_category *cat)
{
struct ast_category *prev = NULL;
cat->next = NULL;
if (config->root) {
prev = config->root;
while(prev->next) prev = prev->next;
prev->next = cat;
} else
config->root = cat;
}
char *ast_category_browse(struct ast_config *config, char *prev)
{
struct ast_category *cat;
if (!prev) {
if (config->root)
return config->root->name;
else
return NULL;
}
cat = config->root;
while(cat) {
if (cat->name == prev) {
if (cat->next)
return cat->next->name;
else
return NULL;
}
cat = cat->next;
}
cat = config->root;
while(cat) {
if (!strcasecmp(cat->name, prev)) {
if (cat->next)
return cat->next->name;
else
return NULL;
}
cat = cat->next;
}
return NULL;
}
struct ast_config *ast_new_config(void)
{
struct ast_config *config;
config = malloc(sizeof(struct ast_config));
memset(config,0,sizeof(struct ast_config));
return config;
}
struct ast_category *ast_new_category(char *name)
{
struct ast_category *category;
category = malloc(sizeof(struct ast_category));
if (category) {
memset(category,0,sizeof(struct ast_category));
strncpy(category->name,name,sizeof(category->name) - 1);
}
return category;
}
struct ast_variable *ast_new_variable(char *name, char *value)
{
struct ast_variable *variable;
int length = strlen(name) + strlen(value) + 2 + sizeof(struct ast_variable);
variable = malloc(length);
if (variable) {
memset(variable, 0, length);
variable->name = variable->stuff;
variable->value = variable->stuff + strlen(name) + 1;
variable->object=0;
strcpy(variable->name,name);
strcpy(variable->value,value);
}
return variable;
}
int ast_cust_config_register(struct ast_config_reg *new)
{
ast_config_register(new);
read_ast_cust_config();
return 1;
}
int ast_cust_config_deregister(struct ast_config_reg *new)
{
ast_config_deregister(new);
read_ast_cust_config();
return 1;
}
static void clear_cust_keywords(void)
{
struct ast_config_map *map, *prev;
ast_mutex_lock(&ast_cust_config_lock);
map = maps;
while(map) {
prev = map;
map = map->next;
free(prev);
}
maps = NULL;
ast_mutex_unlock(&ast_cust_config_lock);
}
static int config_command(int fd, int argc, char **argv)
{
struct ast_config_reg *key;
struct ast_config_map *map;
ast_cli(fd,"\n\n");
ast_mutex_lock(&ast_cust_config_lock);
for (key=get_config_registrations();key;key=key->next) {
ast_cli(fd,"\nConfig Engine: %s\n",key->name);
map = maps;
while(map) {
if (!strcasecmp(map->driver, key->name))
ast_cli(fd,"===> %s (db=%s, table=%s)\n",map->name, map->database, map->table ? map->table : map->name);
map = map->next;
}
}
ast_mutex_unlock(&ast_cust_config_lock);
ast_cli(fd,"\n\n");
return 0;
}
static struct ast_cli_entry config_command_struct = {
{ "show","config","handles", NULL }, config_command,
"Show Config Handles", NULL };
int register_config_cli()
{
return ast_cli_register(&config_command_struct);
}
int read_ast_cust_config(void)
{
char *cfg = config_conf_file;
struct ast_config *config;
struct ast_variable *v;
struct ast_config_map *map;
int length;
char *driver, *table, *database, *stringp;
clear_cust_keywords();
config = ast_load(cfg);
if (config) {
for (v = ast_variable_browse(config,"settings");v;v=v->next) {
stringp = v->value;
driver = strsep(&stringp, ",");
database = strsep(&stringp, ",");
table = strsep(&stringp, ",");
if (!strcmp(v->name,config_conf_file) || !strcmp(v->name,"asterisk.conf")) {
ast_log(LOG_WARNING, "Cannot bind asterisk.conf or extconfig.conf!\n");
} else if (driver && database) {
length = sizeof(struct ast_config_map);
length += strlen(v->name) + 1;
length += strlen(driver) + 1;
length += strlen(database) + 1;
if (table)
length += strlen(table) + 1;
map = malloc(length);
if (map) {
memset(map, 0, length);
map->name = map->stuff;
strcpy(map->name, v->name);
map->driver = map->name + strlen(map->name) + 1;
strcpy(map->driver, driver);
map->database = map->driver + strlen(map->driver) + 1;
strcpy(map->database, database);
if (table) {
map->table = map->database + strlen(map->database) + 1;
strcpy(map->table, table);
} else
map->table = NULL;
map->next = maps;
if (option_verbose > 1)
ast_verbose(VERBOSE_PREFIX_2 "Binding %s to %s/%s/%s\n",map->name,map->driver, map->database, map->table ? map->table : map->name);
maps = map;
}
}
}
ast_destroy(config);
}
return 0;
}
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