450 lines
12 KiB
C
450 lines
12 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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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 Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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#include "asterisk.h"
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#include "asterisk/ast_expr.h"
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#define AST_API_MODULE 1
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#include "asterisk/inline_api.h"
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#define AST_API_MODULE 1
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#include "asterisk/lock.h"
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#include "asterisk/strings.h"
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/* I included this from utils.c, so as not to have everything in that .c
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file included */
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/*!
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* core handler for dynamic strings.
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* This is not meant to be called directly, but rather through the
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* various wrapper macros
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* ast_str_set(...)
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* ast_str_append(...)
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* ast_str_set_va(...)
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* ast_str_append_va(...)
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*/
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int __ast_str_helper(struct ast_str **buf, size_t max_len,
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int append, const char *fmt, va_list ap)
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{
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int res, need;
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int offset = (append && (*buf)->len) ? (*buf)->used : 0;
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if (max_len < 0)
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max_len = (*buf)->len; /* don't exceed the allocated space */
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/*
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* Ask vsnprintf how much space we need. Remember that vsnprintf
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* does not count the final '\0' so we must add 1.
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*/
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res = vsnprintf((*buf)->str + offset, (*buf)->len - offset, fmt, ap);
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need = res + offset + 1;
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/*
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* If there is not enough space and we are below the max length,
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* reallocate the buffer and return a message telling to retry.
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*/
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if (need > (*buf)->len && (max_len == 0 || (*buf)->len < max_len) ) {
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if (max_len && max_len < need) /* truncate as needed */
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need = max_len;
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else if (max_len == 0) /* if unbounded, give more room for next time */
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need += 16 + need/4;
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if (ast_str_make_space(buf, need)) {
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return AST_DYNSTR_BUILD_FAILED;
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}
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(*buf)->str[offset] = '\0'; /* Truncate the partial write. */
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/* va_end() and va_start() must be done before calling
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* vsnprintf() again. */
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return AST_DYNSTR_BUILD_RETRY;
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}
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/* update space used, keep in mind the truncation */
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(*buf)->used = (res + offset > (*buf)->len) ? (*buf)->len : res + offset;
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return res;
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}
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#ifndef DEBUG_THREADS
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enum ast_lock_type {
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AST_MUTEX,
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AST_RDLOCK,
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AST_WRLOCK,
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};
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#endif
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void ast_store_lock_info(enum ast_lock_type type, const char *filename,
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int line_num, const char *func, const char *lock_name, void *lock_addr);
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void ast_store_lock_info(enum ast_lock_type type, const char *filename,
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int line_num, const char *func, const char *lock_name, void *lock_addr)
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{
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/* not a lot to do in a standalone w/o threading! */
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}
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void ast_mark_lock_acquired(void);
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void ast_mark_lock_acquired(void)
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{
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/* not a lot to do in a standalone w/o threading! */
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}
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void ast_remove_lock_info(void *lock_addr);
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void ast_remove_lock_info(void *lock_addr)
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{
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/* not a lot to do in a standalone w/o threading! */
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}
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static int global_lineno = 1;
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static int global_expr_count=0;
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static int global_expr_max_size=0;
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static int global_expr_tot_size=0;
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static int global_warn_count=0;
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static int global_OK_count=0;
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struct varz
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{
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char varname[100]; /* a really ultra-simple, space-wasting linked list of var=val data */
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char varval[1000]; /* if any varname is bigger than 100 chars, or val greater than 1000, then **CRASH** */
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struct varz *next;
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};
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struct varz *global_varlist;
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/* Our own version of ast_log, since the expr parser uses it. */
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void ast_log(int level, const char *file, int line, const char *function, const char *fmt, ...) __attribute__ ((format (printf,5,6)));
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void ast_log(int level, const char *file, int line, const char *function, const char *fmt, ...)
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{
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va_list vars;
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va_start(vars,fmt);
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printf("LOG: lev:%d file:%s line:%d func: %s ",
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level, file, line, function);
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vprintf(fmt, vars);
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fflush(stdout);
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va_end(vars);
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}
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//void ast_register_file_version(const char *file, const char *version);
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//void ast_unregister_file_version(const char *file);
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char *find_var(const char *varname);
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void set_var(const char *varname, const char *varval);
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unsigned int check_expr(char* buffer, char* error_report);
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int check_eval(char *buffer, char *error_report);
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void parse_file(const char *fname);
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void ast_register_file_version(const char *file, const char *version) { }
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void ast_unregister_file_version(const char *file)
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{
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}
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char *find_var(const char *varname) /* the list should be pretty short, if there's any list at all */
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{
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struct varz *t;
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for (t= global_varlist; t; t = t->next) {
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if (!strcmp(t->varname, varname)) {
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return t->varval;
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}
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}
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return 0;
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}
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void set_var(const char *varname, const char *varval);
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void set_var(const char *varname, const char *varval)
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{
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struct varz *t = (struct varz*)calloc(1,sizeof(struct varz));
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if (!t)
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return;
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strcpy(t->varname, varname);
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strcpy(t->varval, varval);
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t->next = global_varlist;
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global_varlist = t;
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}
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unsigned int check_expr(char* buffer, char* error_report)
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{
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char* cp;
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unsigned int warn_found = 0;
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error_report[0] = 0;
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for (cp = buffer; *cp; ++cp)
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{
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switch (*cp)
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{
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case '"':
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/* skip to the other end */
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while (*(++cp) && *cp != '"') ;
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if (*cp == 0)
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{
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fprintf(stderr,
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"Trouble? Unterminated double quote found at line %d\n",
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global_lineno);
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}
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break;
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case '>':
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case '<':
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case '!':
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if ( (*(cp + 1) == '=')
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&& ( ( (cp > buffer) && (*(cp - 1) != ' ') ) || (*(cp + 2) != ' ') ) )
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{
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char msg[200];
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snprintf(msg,
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sizeof(msg),
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"WARNING: line %d: '%c%c' operator not separated by spaces. This may lead to confusion. You may wish to use double quotes to quote the grouping it is in. Please check!\n",
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global_lineno, *cp, *(cp + 1));
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strcat(error_report, msg);
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++global_warn_count;
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++warn_found;
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}
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break;
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case '|':
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case '&':
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case '=':
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case '+':
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case '-':
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case '*':
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case '/':
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case '%':
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case '?':
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case ':':
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if ( ( (cp > buffer) && (*(cp - 1) != ' ') ) || (*(cp + 1) != ' ') )
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{
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char msg[200];
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snprintf(msg,
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sizeof(msg),
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"WARNING: line %d: '%c' operator not separated by spaces. This may lead to confusion. You may wish to use double quotes to quote the grouping it is in. Please check!\n",
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global_lineno, *cp );
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strcat(error_report, msg);
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++global_warn_count;
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++warn_found;
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}
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break;
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}
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}
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return warn_found;
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}
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int check_eval(char *buffer, char *error_report);
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struct ast_custom_function *ast_custom_function_find(const char *name);
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struct ast_custom_function *ast_custom_function_find(const char *name)
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{
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return 0;
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}
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int check_eval(char *buffer, char *error_report)
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{
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char *cp, *ep;
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char s[4096];
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char evalbuf[80000];
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int result;
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error_report[0] = 0;
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ep = evalbuf;
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for (cp=buffer;*cp;cp++) {
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if (*cp == '$' && *(cp+1) == '{') {
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int brack_lev = 1;
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char *xp= cp+2;
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while (*xp) {
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if (*xp == '{')
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brack_lev++;
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else if (*xp == '}')
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brack_lev--;
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if (brack_lev == 0)
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break;
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xp++;
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}
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if (*xp == '}') {
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char varname[200];
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char *val;
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strncpy(varname,cp+2, xp-cp-2);
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varname[xp-cp-2] = 0;
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cp = xp;
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val = find_var(varname);
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if (val) {
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char *z = val;
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while (*z)
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*ep++ = *z++;
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}
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else {
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*ep++ = '5'; /* why not */
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*ep++ = '5';
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*ep++ = '5';
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}
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}
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else {
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printf("Unterminated variable reference at line %d\n", global_lineno);
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*ep++ = *cp;
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}
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}
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else if (*cp == '\\') {
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/* braindead simple elim of backslash */
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cp++;
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*ep++ = *cp;
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}
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else
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*ep++ = *cp;
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}
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*ep++ = 0;
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/* now, run the test */
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result = ast_expr(evalbuf, s, sizeof(s),NULL);
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if (result) {
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sprintf(error_report,"line %d, evaluation of $[ %s ] result: %s\n", global_lineno, evalbuf, s);
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return 1;
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} else {
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sprintf(error_report,"line %d, evaluation of $[ %s ] result: ****SYNTAX ERROR****\n", global_lineno, evalbuf);
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return 1;
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}
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}
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void parse_file(const char *fname);
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void parse_file(const char *fname)
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{
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FILE *f = fopen(fname,"r");
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FILE *l = fopen("expr2_log","w");
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int c1;
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char last_char= 0;
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char buffer[30000]; /* I sure hope no expr gets this big! */
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if (!f) {
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fprintf(stderr,"Couldn't open %s for reading... need an extensions.conf file to parse!\n",fname);
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exit(20);
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}
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if (!l) {
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fprintf(stderr,"Couldn't open 'expr2_log' file for writing... please fix and re-run!\n");
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exit(21);
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}
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global_lineno = 1;
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while ((c1 = fgetc(f)) != EOF) {
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if (c1 == '\n')
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global_lineno++;
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else if (c1 == '[') {
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if (last_char == '$') {
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/* bingo, an expr */
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int bracklev = 1;
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int bufcount = 0;
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int retval;
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char error_report[30000];
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while ((c1 = fgetc(f)) != EOF) {
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if (c1 == '[')
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bracklev++;
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else if (c1 == ']')
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bracklev--;
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if (c1 == '\n') {
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fprintf(l, "ERROR-- A newline in an expression? Weird! ...at line %d\n", global_lineno);
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fclose(f);
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fclose(l);
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printf("--- ERROR --- A newline in the middle of an expression at line %d!\n", global_lineno);
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}
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if (bracklev == 0)
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break;
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buffer[bufcount++] = c1;
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}
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if (c1 == EOF) {
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fprintf(l, "ERROR-- End of File Reached in the middle of an Expr at line %d\n", global_lineno);
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fclose(f);
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fclose(l);
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printf("--- ERROR --- EOF reached in middle of an expression at line %d!\n", global_lineno);
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exit(22);
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}
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buffer[bufcount] = 0;
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/* update stats */
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global_expr_tot_size += bufcount;
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global_expr_count++;
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if (bufcount > global_expr_max_size)
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global_expr_max_size = bufcount;
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retval = check_expr(buffer, error_report); /* check_expr should bump the warning counter */
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if (retval != 0) {
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/* print error report */
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printf("Warning(s) at line %d, expression: $[%s]; see expr2_log file for details\n",
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global_lineno, buffer);
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fprintf(l, "%s", error_report);
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}
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else {
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printf("OK -- $[%s] at line %d\n", buffer, global_lineno);
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global_OK_count++;
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}
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error_report[0] = 0;
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retval = check_eval(buffer, error_report);
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fprintf(l, "%s", error_report);
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}
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}
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last_char = c1;
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}
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printf("Summary:\n Expressions detected: %d\n Expressions OK: %d\n Total # Warnings: %d\n Longest Expr: %d chars\n Ave expr len: %d chars\n",
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global_expr_count,
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global_OK_count,
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global_warn_count,
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global_expr_max_size,
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(global_expr_count) ? global_expr_tot_size/global_expr_count : 0);
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fclose(f);
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fclose(l);
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}
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int main(int argc,char **argv)
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{
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int argc1;
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char *eq;
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if (argc < 2) {
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printf("check_expr -- a program to look thru extensions.conf files for $[...] expressions,\n");
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printf(" and run them thru the parser, looking for problems\n");
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printf("Hey-- give me a path to an extensions.conf file!\n");
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printf(" You can also follow the file path with a series of variable decls,\n");
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printf(" of the form, varname=value, each separated from the next by spaces.\n");
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printf(" (this might allow you to avoid division by zero messages, check that math\n");
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printf(" is being done correctly, etc.)\n");
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printf(" Note that messages about operators not being surrounded by spaces is merely to alert\n");
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printf(" you to possible problems where you might be expecting those operators as part of a string.\n");
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printf(" (to include operators in a string, wrap with double quotes!)\n");
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exit(19);
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}
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global_varlist = 0;
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for (argc1=2;argc1 < argc; argc1++) {
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if ((eq = strchr(argv[argc1],'='))) {
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*eq = 0;
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set_var(argv[argc1],eq+1);
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}
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}
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/* parse command args for x=y and set varz */
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parse_file(argv[1]);
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return 0;
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}
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