804 lines
16 KiB
C
Executable File
804 lines
16 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Configuration File Parser
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include <asterisk/config.h>
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#include <asterisk/options.h>
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#include <asterisk/logger.h>
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#include "asterisk.h"
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#include "astconf.h"
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#define MAX_INCLUDE_LEVEL 10
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struct ast_category {
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char name[80];
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struct ast_variable *root;
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struct ast_category *next;
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#ifdef PRESERVE_COMMENTS
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struct ast_comment *precomments;
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struct ast_comment *sameline;
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#endif
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};
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struct ast_config {
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/* Maybe this structure isn't necessary but we'll keep it
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for now */
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struct ast_category *root;
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struct ast_category *prev;
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#ifdef PRESERVE_COMMENTS
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struct ast_comment *trailingcomments;
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#endif
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};
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#ifdef PRESERVE_COMMENTS
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struct ast_comment_struct
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{
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struct ast_comment *root;
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struct ast_comment *prev;
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};
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#endif
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static char *strip(char *buf)
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{
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char *start;
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/* Strip off trailing whitespace, returns, etc */
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while(strlen(buf) && (buf[strlen(buf)-1]<33))
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buf[strlen(buf)-1] = '\0';
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start = buf;
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/* Strip off leading whitespace, returns, etc */
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while(*start && (*start < 33))
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*start++ = '\0';
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return start;
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}
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#ifdef PRESERVE_COMMENTS
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static void free_comments(struct ast_comment *com)
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{
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struct ast_comment *l;
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while (com) {
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l = com;
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com = com->next;
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free(l);
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}
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}
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#endif
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void ast_destroy(struct ast_config *ast)
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{
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struct ast_category *cat, *catn;
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struct ast_variable *v, *vn;
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if (!ast)
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return;
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cat = ast->root;
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while(cat) {
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v = cat->root;
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while(v) {
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vn = v;
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free(v->name);
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free(v->value);
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#ifdef PRESERVE_COMMENTS
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free_comments(v->precomments);
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free_comments(v->sameline);
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#endif
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v = v->next;
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free(vn);
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}
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catn = cat;
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#ifdef PRESERVE_COMMENTS
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free_comments(cat->precomments);
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free_comments(cat->sameline);
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#endif
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cat = cat->next;
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free(catn);
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}
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#ifdef PRESERVE_COMMENTS
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free_comments(ast->trailingcomments);
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#endif
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free(ast);
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}
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int ast_true(char *s)
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{
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if (!s)
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return 0;
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/* Determine if this is a true value */
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if (!strcasecmp(s, "yes") ||
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!strcasecmp(s, "true") ||
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!strcasecmp(s, "y") ||
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!strcasecmp(s, "t") ||
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!strcasecmp(s, "1"))
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return -1;
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return 0;
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}
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struct ast_variable *ast_variable_browse(struct ast_config *config, char *category)
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{
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struct ast_category *cat;
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cat = config->root;
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while(cat) {
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if (cat->name == category)
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return cat->root;
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cat = cat->next;
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}
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cat = config->root;
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while(cat) {
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if (!strcasecmp(cat->name, category))
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return cat->root;
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cat = cat->next;
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}
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return NULL;
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}
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char *ast_variable_retrieve(struct ast_config *config, char *category, char *value)
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{
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struct ast_variable *v;
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if (category) {
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v = ast_variable_browse(config, category);
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while (v) {
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if (value == v->name)
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return v->value;
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v=v->next;
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}
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v = ast_variable_browse(config, category);
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while (v) {
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if (!strcasecmp(value, v->name))
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return v->value;
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v=v->next;
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}
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} else {
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struct ast_category *cat;
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cat = config->root;
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while(cat) {
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v = cat->root;
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while (v) {
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if (!strcasecmp(value, v->name))
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return v->value;
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v=v->next;
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}
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cat = cat->next;
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}
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}
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return NULL;
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}
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#ifdef PRESERVE_COMMENTS
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int ast_variable_delete(struct ast_config *cfg, char *category, char *variable, char *value)
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{
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struct ast_variable *v, *pv, *bv, *bpv;
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struct ast_category *cat;
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cat = cfg->root;
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while(cat) {
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if (cat->name == category) {
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break;
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}
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cat = cat->next;
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}
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if (!cat) {
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cat = cfg->root;
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while(cat) {
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if (!strcasecmp(cat->name, category)) {
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break;
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}
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cat = cat->next;
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}
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}
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if (!cat)
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return -1;
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v = cat->root;
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pv = NULL;
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while (v) {
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if ((variable == v->name) && (!value || !strcmp(v->value, value)))
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break;
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pv = v;
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v=v->next;
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}
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if (!v) {
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/* Get the last one that looks like it */
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bv = NULL;
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bpv = NULL;
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v = cat->root;
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pv = NULL;
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while (v) {
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if (!strcasecmp(variable, v->name) && (!value || !strcmp(v->value, value))) {
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bv = v;
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bpv = pv;
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}
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pv = v;
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v=v->next;
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}
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v = bv;
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}
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if (v) {
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/* Unlink from original position */
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if (pv)
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pv->next = v->next;
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else
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cat->root = v->next;
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v->next = NULL;
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free(v->name);
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if (v->value)
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free(v->value);
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free_comments(v->sameline);
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free_comments(v->precomments);
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return 0;
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}
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return -1;
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}
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int ast_category_delete(struct ast_config *cfg, char *category)
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{
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struct ast_variable *v, *pv;
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struct ast_category *cat, *cprev;
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cat = cfg->root;
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cprev = NULL;
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while(cat) {
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if (cat->name == category) {
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break;
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}
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cprev = cat;
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cat = cat->next;
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}
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if (!cat) {
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cat = cfg->root;
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cprev = NULL;
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while(cat) {
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if (!strcasecmp(cat->name, category)) {
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break;
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}
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cprev = cat;
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cat = cat->next;
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}
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}
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if (!cat)
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return -1;
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/* Unlink it */
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if (cprev)
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cprev->next = cat->next;
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else
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cfg->root = cat->next;
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v = cat->root;
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while (v) {
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pv = v;
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v=v->next;
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if (pv->value)
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free(pv->value);
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if (pv->name)
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free(pv->name);
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free_comments(pv->sameline);
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free_comments(pv->precomments);
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free(pv);
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}
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free_comments(cat->sameline);
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free_comments(cat->precomments);
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free(cat);
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return 0;
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}
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struct ast_variable *ast_variable_append_modify(struct ast_config *config, char *category, char *variable, char *value, int newcat, int newvar, int move)
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{
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struct ast_variable *v, *pv=NULL, *bv, *bpv;
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struct ast_category *cat, *pcat;
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cat = config->root;
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if (!newcat) {
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while(cat) {
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if (cat->name == category) {
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break;
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}
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cat = cat->next;
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}
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if (!cat) {
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cat = config->root;
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while(cat) {
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if (!strcasecmp(cat->name, category)) {
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break;
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}
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cat = cat->next;
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}
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}
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}
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if (!cat) {
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cat = malloc(sizeof(struct ast_category));
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if (!cat)
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return NULL;
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memset(cat, 0, sizeof(struct ast_category));
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strncpy(cat->name, category, sizeof(cat->name));
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if (config->root) {
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/* Put us at the end */
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pcat = config->root;
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while(pcat->next)
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pcat = pcat->next;
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pcat->next = cat;
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} else {
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/* We're the first one */
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config->root = cat;
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}
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}
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if (!newvar) {
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v = cat->root;
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pv = NULL;
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while (v) {
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if (variable == v->name)
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break;
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pv = v;
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v=v->next;
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}
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if (!v) {
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/* Get the last one that looks like it */
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bv = NULL;
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bpv = NULL;
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v = cat->root;
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pv = NULL;
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while (v) {
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if (!strcasecmp(variable, v->name)) {
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bv = v;
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bpv = pv;
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}
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pv = v;
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v=v->next;
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}
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v = bv;
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}
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} else v = NULL;
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if (v && move) {
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/* Unlink from original position */
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if (pv)
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pv->next = v->next;
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else
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cat->root = v->next;
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v->next = NULL;
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}
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if (!v) {
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v = malloc(sizeof(struct ast_variable));
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if (!v)
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return NULL;
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memset(v, 0, sizeof(struct ast_variable));
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v->name = strdup(variable);
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move = 1;
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}
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if (v->value)
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free(v->value);
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if (value)
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v->value = strdup(value);
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else
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v->value = strdup("");
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if (move) {
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if (cat->root) {
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pv = cat->root;
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while (pv->next)
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pv = pv->next;
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pv->next = v;
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} else {
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cat->root = v;
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}
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}
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return v;
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}
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#endif
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int ast_category_exist(struct ast_config *config, char *category_name)
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{
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struct ast_category *category = NULL;
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category = config->root;
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while(category) {
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if (!strcasecmp(category->name,category_name))
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return 1;
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category = category->next;
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}
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return 0;
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}
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#ifdef PRESERVE_COMMENTS
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static struct ast_comment *build_comment(char *cmt)
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{
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struct ast_comment *c;
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int len = strlen(cmt) + 1;
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c = malloc(sizeof(struct ast_comment) + len);
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if (c) {
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/* Memset the header */
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memset(c, 0, sizeof(struct ast_comment));
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/* Copy the rest */
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strcpy(c->cmt, cmt);
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}
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return c;
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}
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#endif
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static struct ast_config *__ast_load(char *configfile, struct ast_config *tmp, struct ast_category **_tmpc, struct ast_variable **_last, int includelevel
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#ifdef PRESERVE_COMMENTS
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, struct ast_comment_struct *acs
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#endif
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);
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static int cfg_process(struct ast_config *tmp, struct ast_category **_tmpc, struct ast_variable **_last, char *buf, int lineno, char *configfile, int includelevel
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#ifdef PRESERVE_COMMENTS
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,struct ast_comment_struct *acs
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#endif
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)
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{
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char *c;
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char *cur;
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struct ast_variable *v;
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#ifdef PRESERVE_COMMENTS
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struct ast_comment *com = NULL;
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#endif
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int object;
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/* Strip off lines using ; as comment */
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c = strchr(buf, ';');
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if (c) {
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*c = '\0';
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#ifdef PRESERVE_COMMENTS
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c++;
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if (*c != '!')
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com = build_comment(c);
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#endif
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}
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cur = strip(buf);
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if (strlen(cur)) {
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/* Actually parse the entry */
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if (cur[0] == '[') {
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/* A category header */
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c = strchr(cur, ']');
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if (c) {
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*c = 0;
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*_tmpc = malloc(sizeof(struct ast_category));
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if (!*_tmpc) {
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ast_destroy(tmp);
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ast_log(LOG_WARNING,
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"Out of memory, line %d\n", lineno);
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return -1;
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}
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memset(*_tmpc, 0, sizeof(struct ast_category));
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strncpy((*_tmpc)->name, cur+1, sizeof((*_tmpc)->name) - 1);
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(*_tmpc)->root = NULL;
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#ifdef PRESERVE_COMMENTS
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(*_tmpc)->precomments = acs->root;
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(*_tmpc)->sameline = com;
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#endif
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if (!tmp->prev)
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tmp->root = *_tmpc;
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else
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tmp->prev->next = *_tmpc;
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tmp->prev = *_tmpc;
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#ifdef PRESERVE_COMMENTS
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acs->root = NULL;
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acs->prev = NULL;
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#endif
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*_last = NULL;
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} else {
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ast_log(LOG_WARNING,
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"parse error: no closing ']', line %d of %s\n", lineno, configfile);
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}
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} else if (cur[0] == '#') {
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/* A directive */
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cur++;
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c = cur;
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while(*c && (*c > 32)) c++;
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if (*c) {
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*c = '\0';
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c++;
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/* Find real argument */
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while(*c && (*c < 33)) c++;
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if (!*c)
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c = NULL;
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} else
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c = NULL;
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if (!strcasecmp(cur, "include")) {
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/* A #include */
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if (c) {
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while((*c == '<') || (*c == '>') || (*c == '\"')) c++;
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/* Get rid of leading mess */
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cur = c;
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while(strlen(cur)) {
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c = cur + strlen(cur) - 1;
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if ((*c == '>') || (*c == '<') || (*c == '\"'))
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*c = '\0';
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else
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break;
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}
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if (includelevel < MAX_INCLUDE_LEVEL) {
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__ast_load(cur, tmp, _tmpc, _last, includelevel + 1
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#ifdef PRESERVE_COMMENTS
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,acs
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#endif
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);
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} else
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ast_log(LOG_WARNING, "Maximum Include level (%d) exceeded\n", includelevel);
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} else
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ast_log(LOG_WARNING, "Directive '#include' needs an argument (filename) at line %d of %s\n", lineno, configfile);
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/* Strip off leading and trailing "'s and <>'s */
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} else
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ast_log(LOG_WARNING, "Unknown directive '%s' at line %d of %s\n", cur, lineno, configfile);
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} else {
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/* Just a line (variable = value) */
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if (!*_tmpc) {
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ast_log(LOG_WARNING,
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"parse error: No category context for line %d of %s\n", lineno, configfile);
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ast_destroy(tmp);
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return -1;
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}
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c = strchr(cur, '=');
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if (c) {
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*c = 0;
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c++;
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/* Ignore > in => */
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if (*c== '>') {
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object = 1;
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c++;
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} else
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object = 0;
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v = malloc(sizeof(struct ast_variable));
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if (v) {
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memset(v, 0, sizeof(struct ast_variable));
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v->next = NULL;
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v->name = strdup(strip(cur));
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v->value = strdup(strip(c));
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v->lineno = lineno;
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v->object = object;
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/* Put and reset comments */
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#ifdef PRESERVE_COMMENTS
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v->precomments = acs->root;
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v->sameline = com;
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acs->prev = NULL;
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acs->root = NULL;
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#endif
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v->blanklines = 0;
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if (*_last)
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(*_last)->next = v;
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else
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(*_tmpc)->root = v;
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*_last = v;
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} else {
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ast_destroy(tmp);
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ast_log(LOG_WARNING, "Out of memory, line %d\n", lineno);
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return -1;
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}
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} else {
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ast_log(LOG_WARNING, "No '=' (equal sign) in line %d of %s\n", lineno, configfile);
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}
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|
}
|
|
} else {
|
|
/* store any comments if there are any */
|
|
#ifdef PRESERVE_COMMENTS
|
|
if (com) {
|
|
if (acs->prev)
|
|
acs->prev->next = com;
|
|
else
|
|
acs->root = com;
|
|
acs->prev = com;
|
|
} else {
|
|
if (*_last)
|
|
(*_last)->blanklines++;
|
|
|
|
}
|
|
#endif
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef PRESERVE_COMMENTS
|
|
static void dump_comments(FILE *f, struct ast_comment *comment)
|
|
{
|
|
while (comment) {
|
|
fprintf(f, ";%s", comment->cmt);
|
|
comment = comment->next;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
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));
|
|
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) {
|
|
#ifdef PRESERVE_COMMENTS
|
|
/* Dump any precomments */
|
|
dump_comments(f, cat->precomments);
|
|
#endif
|
|
/* Dump section with any appropriate comment */
|
|
#ifdef PRESERVE_COMMENTS
|
|
if (cat->sameline)
|
|
fprintf(f, "[%s] ; %s\n", cat->name, cat->sameline->cmt);
|
|
else
|
|
#endif
|
|
fprintf(f, "[%s]\n", cat->name);
|
|
var = cat->root;
|
|
while(var) {
|
|
#ifdef PRESERVE_COMMENTS
|
|
dump_comments(f, var->precomments);
|
|
#endif
|
|
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;
|
|
}
|
|
#ifdef PRESERVE_COMMENTS
|
|
dump_comments(f, cfg->trailingcomments);
|
|
#endif
|
|
} 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;
|
|
}
|
|
|
|
static struct ast_config *__ast_load(char *configfile, struct ast_config *tmp, struct ast_category **_tmpc, struct ast_variable **_last, int includelevel
|
|
#ifdef PRESERVE_COMMENTS
|
|
, struct ast_comment_struct *acs
|
|
#endif
|
|
)
|
|
{
|
|
char fn[256];
|
|
char buf[256];
|
|
FILE *f;
|
|
int lineno=0;
|
|
int master=0;
|
|
|
|
if (configfile[0] == '/') {
|
|
strncpy(fn, configfile, sizeof(fn)-1);
|
|
} else {
|
|
snprintf(fn, sizeof(fn), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, configfile);
|
|
}
|
|
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 > 1)
|
|
ast_verbose( "Found\n");
|
|
if (!tmp) {
|
|
tmp = malloc(sizeof(struct ast_config));
|
|
if (tmp)
|
|
memset(tmp, 0, sizeof(struct ast_config));
|
|
|
|
master = 1;
|
|
}
|
|
if (!tmp) {
|
|
ast_log(LOG_WARNING, "Out of memory\n");
|
|
fclose(f);
|
|
return NULL;
|
|
}
|
|
while(!feof(f)) {
|
|
fgets(buf, sizeof(buf), f);
|
|
lineno++;
|
|
if (!feof(f)) {
|
|
if (cfg_process(tmp, _tmpc, _last, buf, lineno, configfile, includelevel
|
|
#ifdef PRESERVE_COMMENTS
|
|
, acs
|
|
#endif
|
|
)) {
|
|
fclose(f);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
fclose(f);
|
|
} else {
|
|
if (option_debug)
|
|
ast_log(LOG_DEBUG, "No file to parse: %s\n", fn);
|
|
else if (option_verbose > 1)
|
|
ast_verbose( "Not found (%s)", strerror(errno));
|
|
}
|
|
#ifdef PRESERVE_COMMENTS
|
|
if (master) {
|
|
/* Keep trailing comments */
|
|
tmp->trailingcomments = acs->root;
|
|
acs->root = NULL;
|
|
acs->prev = NULL;
|
|
}
|
|
#endif
|
|
return tmp;
|
|
}
|
|
|
|
struct ast_config *ast_load(char *configfile)
|
|
{
|
|
struct ast_category *tmpc=NULL;
|
|
struct ast_variable *last = NULL;
|
|
#ifdef PRESERVE_COMMENTS
|
|
struct ast_comment_struct acs = { NULL, NULL };
|
|
#endif
|
|
return __ast_load(configfile, NULL, &tmpc, &last, 0
|
|
#ifdef PRESERVE_COMMENTS
|
|
,&acs
|
|
#endif
|
|
);
|
|
}
|
|
|
|
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;
|
|
}
|