2 * Lexical scanner for Bacula configuration file
11 Copyright (C) 2000-2005 Kern Sibbald
13 This program is free software; you can redistribute it and/or
14 modify it under the terms of the GNU General Public License as
15 published by the Free Software Foundation; either version 2 of
16 the License, or (at your option) any later version.
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 General Public License for more details.
23 You should have received a copy of the GNU General Public
24 License along with this program; if not, write to the Free
25 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
33 extern int debug_level;
36 * Scan to "logical" end of line. I.e. end of line,
37 * or semicolon, but stop on T_EOB (same as end of
38 * line except it is not eaten).
40 void scan_to_eol(LEX *lc)
43 Dmsg0(2000, "start scan to eof\n");
44 while ((token = lex_get_token(lc, T_ALL)) != T_EOL) {
53 * Get next token, but skip EOL
55 int scan_to_next_not_eol(LEX * lc)
59 token = lex_get_token(lc, T_ALL);
60 } while (token == T_EOL);
65 * Format a scanner error message
67 static void s_err(const char *file, int line, LEX *lc, const char *msg, ...)
73 va_start(arg_ptr, msg);
74 bvsnprintf(buf, sizeof(buf), msg, arg_ptr);
77 if (lc->err_type == 0) { /* M_ERROR_TERM by default */
78 lc->err_type = M_ERROR_TERM;
81 if (lc->line_no > lc->begin_line_no) {
82 bsnprintf(more, sizeof(more),
83 _("Problem probably begins at line %d.\n"), lc->begin_line_no);
87 if (lc->line_no > 0) {
88 e_msg(file, line, lc->err_type, 0, _("Config error: %s\n"
89 " : line %d, col %d of file %s\n%s\n%s"),
90 buf, lc->line_no, lc->col_no, lc->fname, lc->line, more);
92 e_msg(file, line, lc->err_type, 0, _("Config error: %s\n"), buf);
96 void lex_set_default_error_handler(LEX *lf)
98 lf->scan_error = s_err;
102 * Set err_type used in error_handler
103 * return the old value
105 int lex_set_error_handler_error_type(LEX *lf, int err_type)
107 int old = lf->err_type;
108 lf->err_type = err_type;
113 * Free the current file, and retrieve the contents
114 * of the previous packet if any.
116 LEX *lex_close_file(LEX *lf)
121 Emsg0(M_ABORT, 0, _("Close of NULL file\n"));
123 Dmsg1(2000, "Close lex file: %s\n", lf->fname);
127 Dmsg1(2000, "Close cfg file %s\n", lf->fname);
130 of->options = lf->options; /* preserve options */
131 memcpy(lf, of, sizeof(LEX));
132 Dmsg1(2000, "Restart scan of cfg file %s\n", of->fname);
142 * Open a new configuration file. We push the
143 * state of the current file (lf) so that we
144 * can do includes. This is a bit of a hammer.
145 * Instead of passing back the pointer to the
146 * new packet, I simply replace the contents
147 * of the caller's packet with the new packet,
148 * and link the contents of the old packet into
152 LEX *lex_open_file(LEX *lf, const char *filename, LEX_ERROR_HANDLER *scan_error)
157 char *fname = bstrdup(filename);
160 if ((fd = fopen(fname, "r")) == NULL) {
163 Dmsg1(400, "Open config file: %s\n", fname);
164 nf = (LEX *)malloc(sizeof(LEX));
166 memcpy(nf, lf, sizeof(LEX));
167 memset(lf, 0, sizeof(LEX));
168 lf->next = nf; /* if have lf, push it behind new one */
169 lf->options = nf->options; /* preserve user options */
171 lf = nf; /* start new packet */
172 memset(lf, 0, sizeof(LEX));
173 lex_set_error_handler_error_type(lf, M_ERROR_TERM);
176 lf->scan_error = scan_error;
178 lex_set_default_error_handler(lf);
182 lf->state = lex_none;
184 Dmsg1(2000, "Return lex=%x\n", lf);
189 * Get the next character from the input.
190 * Returns the character or
191 * L_EOF if end of file
192 * L_EOL if end of line
194 int lex_get_char(LEX *lf)
196 if (lf->ch == L_EOF) {
197 Emsg0(M_ABORT, 0, _("get_char: called after EOF\n"));
199 if (lf->ch == L_EOL) {
200 if (bfgets(lf->line, MAXSTRING, lf->fd) == NULL) {
209 Dmsg2(1000, "fget line=%d %s", lf->line_no, lf->line);
211 lf->ch = (uint8_t)lf->line[lf->col_no];
217 Dmsg2(2000, "lex_get_char: %c %d\n", lf->ch, lf->ch);
221 void lex_unget_char(LEX *lf)
230 * Add a character to the current string
232 static void add_str(LEX *lf, int ch)
234 if (lf->str_len >= MAXSTRING-3) {
235 Emsg3(M_ERROR_TERM, 0, _(
236 _("Config token too long, file: %s, line %d, begins at line %d\n")),
237 lf->fname, lf->line_no, lf->begin_line_no);
239 lf->str[lf->str_len++] = ch;
240 lf->str[lf->str_len] = 0;
246 static void begin_str(LEX *lf, int ch)
253 lf->begin_line_no = lf->line_no; /* save start string line no */
257 static const char *lex_state_to_str(int state)
260 case lex_none: return _("none");
261 case lex_comment: return _("comment");
262 case lex_number: return _("number");
263 case lex_ip_addr: return _("ip_addr");
264 case lex_identifier: return _("identifier");
265 case lex_string: return _("string");
266 case lex_quoted_string: return _("quoted_string");
267 default: return "??????";
273 * Convert a lex token to a string
274 * used for debug/error printing.
276 const char *lex_tok_to_str(int token)
279 case L_EOF: return "L_EOF";
280 case L_EOL: return "L_EOL";
281 case T_NONE: return "T_NONE";
282 case T_NUMBER: return "T_NUMBER";
283 case T_IPADDR: return "T_IPADDR";
284 case T_IDENTIFIER: return "T_IDENTIFIER";
285 case T_UNQUOTED_STRING: return "T_UNQUOTED_STRING";
286 case T_QUOTED_STRING: return "T_QUOTED_STRING";
287 case T_BOB: return "T_BOB";
288 case T_EOB: return "T_EOB";
289 case T_EQUALS: return "T_EQUALS";
290 case T_ERROR: return "T_ERROR";
291 case T_EOF: return "T_EOF";
292 case T_COMMA: return "T_COMMA";
293 case T_EOL: return "T_EOL";
294 default: return "??????";
298 static uint32_t scan_pint(LEX *lf, char *str)
301 if (!is_a_number(str)) {
302 scan_err1(lf, _("expected a positive integer number, got: %s"), str);
306 val = str_to_int64(str);
307 if (errno != 0 || val < 0) {
308 scan_err1(lf, _("expected a positive integer number, got: %s"), str);
312 return (uint32_t)val;
317 * Get the next token from the input
321 lex_get_token(LEX *lf, int expect)
325 bool esc_next = false;
327 Dmsg0(2000, "enter lex_get_token\n");
328 while (token == T_NONE) {
329 ch = lex_get_char(lf);
332 Dmsg2(2000, "Lex state lex_none ch=%d,%x\n", ch, ch);
336 if (lf->options & LOPT_NO_IDENT || lf->options & LOPT_STRING) {
337 lf->state = lex_string;
339 lf->state = lex_identifier;
345 if (lf->options & LOPT_STRING) {
346 lf->state = lex_string;
348 lf->state = lex_number;
353 Dmsg0(2000, "Enter lex_none switch\n");
357 Dmsg0(2000, "got L_EOF set token=T_EOF\n");
360 lf->state = lex_comment;
371 lf->state = lex_quoted_string;
383 if (expect != T_SKIP_EOL) {
384 token = T_EOL; /* treat ; like EOL */
388 Dmsg0(2000, "got L_EOL set token=T_EOL\n");
389 if (expect != T_SKIP_EOL) {
394 lf->state = lex_include;
398 lf->state = lex_string;
404 Dmsg1(2000, "Lex state lex_comment ch=%x\n", ch);
406 lf->state = lex_none;
407 if (expect != T_SKIP_EOL) {
410 } else if (ch == L_EOF) {
415 Dmsg2(2000, "Lex state lex_number ch=%x %c\n", ch, ch);
420 /* Might want to allow trailing specifications here */
426 /* A valid number can be terminated by the following */
427 if (B_ISSPACE(ch) || ch == L_EOL || ch == ',' || ch == ';') {
429 lf->state = lex_none;
431 lf->state = lex_string;
440 Dmsg1(2000, "Lex state lex_ip_addr ch=%x\n", ch);
443 Dmsg1(2000, "Lex state lex_string ch=%x\n", ch);
448 if (ch == '\n' || ch == L_EOL || ch == '=' || ch == '}' || ch == '{' ||
449 ch == '\r' || ch == ';' || ch == ',' || ch == '#' || (B_ISSPACE(ch)) ) {
451 token = T_UNQUOTED_STRING;
452 lf->state = lex_none;
458 Dmsg2(2000, "Lex state lex_identifier ch=%x %c\n", ch, ch);
462 } else if (B_ISSPACE(ch)) {
464 } else if (ch == '\n' || ch == L_EOL || ch == '=' || ch == '}' || ch == '{' ||
465 ch == '\r' || ch == ';' || ch == ',' || ch == '"' || ch == '#') {
467 token = T_IDENTIFIER;
468 lf->state = lex_none;
470 } else if (ch == L_EOF) {
472 lf->state = lex_none;
476 /* Some non-alpha character => string */
477 lf->state = lex_string;
480 case lex_quoted_string:
481 Dmsg2(2000, "Lex state lex_quoted_string ch=%x %c\n", ch, ch);
500 token = T_QUOTED_STRING;
501 lf->state = lex_none;
506 case lex_include: /* scanning a filename */
511 if (B_ISSPACE(ch) || ch == '\n' || ch == L_EOL || ch == '}' || ch == '{' ||
512 ch == ';' || ch == ',' || ch == '"' || ch == '#') {
513 /* Keep the original LEX so we can print an error if the included file can't be opened. */
516 lf->state = lex_none;
517 lf = lex_open_file(lf, lf->str, lf->scan_error);
520 scan_err2(lfori, _("Cannot open included config file %s: %s\n"),
521 lfori->str, be.strerror());
529 Dmsg4(2000, "ch=%d state=%s token=%s %c\n", ch, lex_state_to_str(lf->state),
530 lex_tok_to_str(token), ch);
532 Dmsg2(2000, "lex returning: line %d token: %s\n", lf->line_no, lex_tok_to_str(token));
536 * Here is where we check to see if the user has set certain
537 * expectations (e.g. 32 bit integer). If so, we do type checking
538 * and possible additional scanning (e.g. for range).
542 lf->pint32_val = scan_pint(lf, lf->str);
543 lf->pint32_val2 = lf->pint32_val;
548 if (token == T_NUMBER) {
549 lf->pint32_val = scan_pint(lf, lf->str);
550 lf->pint32_val2 = lf->pint32_val;
553 char *p = strchr(lf->str, '-');
555 scan_err2(lf, _("expected an integer or a range, got %s: %s"),
556 lex_tok_to_str(token), lf->str);
560 *p++ = 0; /* terminate first half of range */
561 lf->pint32_val = scan_pint(lf, lf->str);
562 lf->pint32_val2 = scan_pint(lf, p);
563 token = T_PINT32_RANGE;
568 if (token != T_NUMBER || !is_a_number(lf->str)) {
569 scan_err2(lf, _("expected an integer number, got %s: %s"),
570 lex_tok_to_str(token), lf->str);
575 lf->int32_val = (int32_t)str_to_int64(lf->str);
577 scan_err2(lf, _("expected an integer number, got %s: %s"),
578 lex_tok_to_str(token), lf->str);
586 Dmsg2(2000, "int64=:%s: %f\n", lf->str, strtod(lf->str, NULL));
587 if (token != T_NUMBER || !is_a_number(lf->str)) {
588 scan_err2(lf, _("expected an integer number, got %s: %s"),
589 lex_tok_to_str(token), lf->str);
594 lf->int64_val = str_to_int64(lf->str);
596 scan_err2(lf, _("expected an integer number, got %s: %s"),
597 lex_tok_to_str(token), lf->str);
605 if (token != T_IDENTIFIER && token != T_UNQUOTED_STRING && token != T_QUOTED_STRING) {
606 scan_err2(lf, _("expected a name, got %s: %s"),
607 lex_tok_to_str(token), lf->str);
609 } else if (lf->str_len > MAX_RES_NAME_LENGTH) {
610 scan_err3(lf, _("name %s length %d too long, max is %d\n"), lf->str,
611 lf->str_len, MAX_RES_NAME_LENGTH);
617 if (token != T_IDENTIFIER && token != T_UNQUOTED_STRING && token != T_QUOTED_STRING) {
618 scan_err2(lf, _("expected a string, got %s: %s"),
619 lex_tok_to_str(token), lf->str);
628 break; /* no expectation given */
630 lf->token = token; /* set possible new token */