astconfig.c

asterisk 的7号信令处理模块

{
	struct ast_variable *cur, *prev=NULL, *newer;

	if (!(newer = ast_variable_new(variable, value)))
		return -1;
	
	newer->object = object;

	for (cur = category->root; cur; prev = cur, cur = cur->next) {
		if (strcasecmp(cur->name, variable) ||
			(!ast_strlen_zero(match) && strcasecmp(cur->value, match)))
			continue;

		newer->next = cur->next;
		newer->object = cur->object || object;
		if (prev)
			prev->next = newer;
		else
			category->root = newer;
		if (category->last == cur)
			category->last = newer;

		cur->next = NULL;
		ast_variables_destroy(cur);

		return 0;
	}

	if (prev)
		prev->next = newer;
	else
		category->root = newer;

	return 0;
}

int ast_category_delete(struct ast_config *cfg, char *category)
{
	struct ast_category *prev=NULL, *cat;
	cat = cfg->root;
	while(cat) {
		if (cat->name == category) {
			ast_variables_destroy(cat->root);
			if (prev) {
				prev->next = cat->next;
				if (cat == cfg->last)
					cfg->last = prev;
			} else {
				cfg->root = cat->next;
				if (cat == cfg->last)
					cfg->last = NULL;
			}
			free(cat);
			return 0;
		}
		prev = cat;
		cat = cat->next;
	}

	prev = NULL;
	cat = cfg->root;
	while(cat) {
		if (!strcasecmp(cat->name, category)) {
			ast_variables_destroy(cat->root);
			if (prev) {
				prev->next = cat->next;
				if (cat == cfg->last)
					cfg->last = prev;
			} else {
				cfg->root = cat->next;
				if (cat == cfg->last)
					cfg->last = NULL;
			}
			free(cat);
			return 0;
		}
		prev = cat;
		cat = cat->next;
	}
	return -1;
}

void ast_config_destroy(struct ast_config *cfg)
{
	struct ast_category *cat, *catn;

	if (!cfg)
		return;

	cat = cfg->root;
	while(cat) {
		ast_variables_destroy(cat->root);
		catn = cat;
		cat = cat->next;
		free(catn);
	}
	free(cfg);
}

struct ast_category *ast_config_get_current_category(const struct ast_config *cfg)
{
	return cfg->current;
}

void ast_config_set_current_category(struct ast_config *cfg, const struct ast_category *cat)
{
	/* cast below is just to silence compiler warning about dropping "const" */
	cfg->current = (struct ast_category *) cat;
}

static int process_text_line(struct ast_config *cfg, struct ast_category **cat, char *buf, int lineno, const char *configfile, int withcomments,
				char **comment_buffer, int *comment_buffer_size, char **lline_buffer, int *lline_buffer_size)
{
	char *c;
	char *cur = buf;
	struct ast_variable *v;
	char cmd[512], exec_file[512];
	int object, do_exec, do_include;

	/* Actually parse the entry */
	if (cur[0] == '[') {
		struct ast_category *newcat = NULL;
		char *catname;

		/* A category header */
		c = strchr(cur, ']');
		if (!c) {
			ast_log(LOG_WARNING, "parse error: no closing ']', line %d of %s\n", lineno, configfile);
			return -1;
		}
		*c++ = '\0';
		cur++;
 		if (*c++ != '(')
 			c = NULL;
		catname = cur;
		if (!(*cat = newcat = ast_category_new(catname))) {
			return -1;
		}
		/* add comments */
		if (withcomments && *comment_buffer && (*comment_buffer)[0] ) {
			newcat->precomments = ALLOC_COMMENT(*comment_buffer);
		}
		if (withcomments && *lline_buffer && (*lline_buffer)[0] ) {
			newcat->sameline = ALLOC_COMMENT(*lline_buffer);
		}
		if( withcomments )
			CB_RESET(comment_buffer, lline_buffer);
		
 		/* If there are options or categories to inherit from, process them now */
 		if (c) {
 			if (!(cur = strchr(c, ')'))) {
 				ast_log(LOG_WARNING, "parse error: no closing ')', line %d of %s\n", lineno, configfile);
 				return -1;
 			}
 			*cur = '\0';
 			while ((cur = strsep(&c, ","))) {
				if (!strcasecmp(cur, "!")) {
					(*cat)->ignored = 1;
				} else if (!strcasecmp(cur, "+")) {
					*cat = category_get(cfg, catname, 1);
					if (!(*cat)) {
						if (newcat)
							ast_category_destroy(newcat);
						ast_log(LOG_WARNING, "Category addition requested, but category '%s' does not exist, line %d of %s\n", catname, lineno, configfile);
						return -1;
					}
					if (newcat) {
						move_variables(newcat, *cat);
						ast_category_destroy(newcat);
						newcat = NULL;
					}
				} else {
					struct ast_category *base;
 				
					base = category_get(cfg, cur, 1);
					if (!base) {
						ast_log(LOG_WARNING, "Inheritance requested, but category '%s' does not exist, line %d of %s\n", cur, lineno, configfile);
						return -1;
					}
					inherit_category(*cat, base);
				}
 			}
 		}
		if (newcat)
			ast_category_append(cfg, *cat);
	} else if (cur[0] == '#') {
		/* A directive */
		cur++;
		c = cur;
		while(*c && (*c > 32)) c++;
		if (*c) {
			*c = '\0';
			/* Find real argument */
			c = ast_skip_blanks(c + 1);
			if (!(*c))
				c = NULL;
		} else 
			c = NULL;
		do_include = !strcasecmp(cur, "include");
		if(!do_include)
			do_exec = !strcasecmp(cur, "exec");
		else
			do_exec = 0;
		if (do_exec && !ast_opt_exec_includes) {
			ast_log(LOG_WARNING, "Cannot perform #exec unless execincludes option is enabled in asterisk.conf (options section)!\n");
			do_exec = 0;
		}
		if (do_include || do_exec) {
			if (c) {
				/* Strip off leading and trailing "'s and <>'s */
				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;
				}
				/* #exec </path/to/executable>
				   We create a tmp file, then we #include it, then we delete it. */
				if (do_exec) { 
					snprintf(exec_file, sizeof(exec_file), "/var/tmp/exec.%d.%ld", (int)time(NULL), (long)pthread_self());
					snprintf(cmd, sizeof(cmd), "%s > %s 2>&1", cur, exec_file);
					ast_safe_system(cmd);
					cur = exec_file;
				} else
					exec_file[0] = '\0';
				/* A #include */
#ifdef USE_ASTERISK_1_4
				do_include = ast_config_internal_load(cur, cfg, withcomments) ? 1 : 0;
#else
				do_include = ast_config_internal_load(cur, cfg) ? 1 : 0;
#endif
				if(!ast_strlen_zero(exec_file))
					unlink(exec_file);
				if(!do_include)
					return 0;

			} else {
				ast_log(LOG_WARNING, "Directive '#%s' needs an argument (%s) at line %d of %s\n", 
						do_exec ? "exec" : "include",
						do_exec ? "/path/to/executable" : "filename",
						lineno,
						configfile);
			}
		}
		else 
			ast_log(LOG_WARNING, "Unknown directive '%s' at line %d of %s\n", cur, lineno, configfile);
	} else {
		/* Just a line (variable = value) */
		if (!(*cat)) {
			ast_log(LOG_WARNING,
				"parse error: No category context for line %d of %s\n", lineno, configfile);
			return -1;
		}
		c = strchr(cur, '=');
		if (c) {
			*c = 0;
			c++;
			/* Ignore > in => */
			if (*c== '>') {
				object = 1;
				c++;
			} else
				object = 0;
			if ((v = ast_variable_new(ast_strip(cur), ast_strip(c)))) {
				v->lineno = lineno;
				v->object = object;
				/* Put and reset comments */
				v->blanklines = 0;
				ast_variable_append(*cat, v);
				/* add comments */
				if (withcomments && *comment_buffer && (*comment_buffer)[0] ) {
					v->precomments = ALLOC_COMMENT(*comment_buffer);
				}
				if (withcomments && *lline_buffer && (*lline_buffer)[0] ) {
					v->sameline = ALLOC_COMMENT(*lline_buffer);
				}
				if( withcomments )
					CB_RESET(comment_buffer, lline_buffer);
				
			} else {
				return -1;
			}
		} else {
			ast_log(LOG_WARNING, "No '=' (equal sign) in line %d of %s\n", lineno, configfile);
		}
	}
	return 0;
}

static struct ast_config *config_text_file_load(const char *database, const char *table, const char *filename, struct ast_config *cfg, int withcomments)
{
	char fn[256];
	char buf[8192];
	char *new_buf, *comment_p, *process_buf;
	FILE *f;
	int lineno=0;
	int comment = 0, nest[MAX_NESTED_COMMENTS];
	struct ast_category *cat = NULL;
	int count = 0;
	struct stat statbuf;
	/*! Growable string buffer */
	char *comment_buffer=0;   /*!< this will be a comment collector.*/
	int   comment_buffer_size=0;  /*!< the amount of storage so far alloc'd for the comment_buffer */

	char *lline_buffer=0;    /*!< A buffer for stuff behind the ; */
	int  lline_buffer_size=0;

	
	cat = ast_config_get_current_category(cfg);

	if (filename[0] == '/') {
		ast_copy_string(fn, filename, sizeof(fn));
	} else {
		snprintf(fn, sizeof(fn), "%s/%s", (char *)ast_config_AST_CONFIG_DIR, filename);
	}

	if (withcomments) {
		CB_INIT(&comment_buffer, &comment_buffer_size, &lline_buffer, &lline_buffer_size);
		if (!lline_buffer || !comment_buffer) {
			ast_log(LOG_ERROR, "Failed to initialize the comment buffer!\n");
			return NULL;
		}
	}
#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++) {
				ast_copy_string(fn, globbuf.gl_pathv[i], sizeof(fn));
#endif
	do {
		if (stat(fn, &statbuf))
			continue;

		if (!S_ISREG(statbuf.st_mode)) {
			ast_log(LOG_WARNING, "'%s' is not a regular file, ignoring\n", fn);
			continue;
		}
		if (option_verbose > 1) {
			ast_verbose(VERBOSE_PREFIX_2 "Parsing '%s': ", fn);
			fflush(stdout);
		}
		if (!(f = fopen(fn, "r"))) {
			if (option_debug)
				ast_log(LOG_DEBUG, "No file to parse: %s\n", fn);
			if (option_verbose > 1)
				ast_verbose( "Not found (%s)\n", strerror(errno));
			continue;
		}
		count++;
		if (option_debug)
			ast_log(LOG_DEBUG, "Parsing %s\n", fn);
		if (option_verbose > 1)
			ast_verbose("Found\n");
		while(!feof(f)) {
			lineno++;
			if (fgets(buf, sizeof(buf), f)) {
				if ( withcomments ) {
					CB_ADD(&comment_buffer, &comment_buffer_size, lline_buffer);       /* add the current lline buffer to the comment buffer */
					lline_buffer[0] = 0;        /* erase the lline buffer */
				}
				
				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);
								if ( withcomments ) {
									CB_ADD(&comment_buffer, &comment_buffer_size, ";");
									CB_ADD_LEN(&comment_buffer, &comment_buffer_size, oldptr+1, new_buf-oldptr-1);
								}
								
								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 */
							if ( withcomments ) {
								LLB_ADD(&lline_buffer, &lline_buffer_size, comment_p);
							}
							*comment_p = '\0'; 
							new_buf = comment_p;
						} else
							new_buf = comment_p + 1;
					}
				}
				if( withcomments && comment && !process_buf )
				{
					CB_ADD(&comment_buffer, &comment_buffer_size, buf);  /* the whole line is a comment, store it */
				}
				
				if (process_buf) {
					char *buf = ast_strip(process_buf);
					if (!ast_strlen_zero(buf)) {
						if (process_text_line(cfg, &cat, buf, lineno, fn, withcomments, &comment_buffer, &comment_buffer_size, &lline_buffer, &lline_buffer_size)) {
							cfg = NULL;
							break;
						}
					}
				}
			}
		}
		fclose(f);		
	} while(0);
	if (comment) {
		ast_log(LOG_WARNING,"Unterminated comment detected beginning on line %d\n", nest[comment - 1]);
	}
#ifdef AST_INCLUDE_GLOB
					if (!cfg)
						break;
				}
				globfree(&globbuf);
			}
		}
#endif

	if (cfg && cfg->include_level == 1 && withcomments && comment_buffer) {
		free(comment_buffer);
		free(lline_buffer);
		comment_buffer = NULL;
		lline_buffer = NULL;
		comment_buffer_size = 0;
		lline_buffer_size = 0;
	}
	
	if (count == 0)
		return NULL;

	return cfg;
}

int config_text_file_save(const char *configfile, const struct ast_config *cfg, const char *generator)
{
	FILE *f;
	char fn[256];
	char date[256]="";
	time_t t;