563 lines
13 KiB
C
563 lines
13 KiB
C
/* conflex.c
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Lexical scanner for dhcpd config file... */
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/*
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* Copyright (c) 1995, 1996, 1997 The Internet Software Consortium.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#ifndef lint
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static char copyright[] =
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"$Id: conflex.c,v 1.29.2.4 1999/04/06 14:58:55 mellon Exp $ Copyright (c) 1995, 1996, 1997 The Internet Software Consortium. All rights reserved.\n";
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#endif /* not lint */
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#include "dhcpd.h"
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#include "dhctoken.h"
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#include <ctype.h>
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int lexline;
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int lexchar;
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char *token_line;
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char *prev_line;
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char *cur_line;
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char *tlname;
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int eol_token;
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static char line1 [81];
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static char line2 [81];
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static int lpos;
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static int line;
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static int tlpos;
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static int tline;
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static int token;
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static int ugflag;
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static char *tval;
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static char tokbuf [1500];
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#ifdef OLD_LEXER
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char comments [4096];
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int comment_index;
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#endif
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static int get_char PROTO ((FILE *));
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static int get_token PROTO ((FILE *));
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static void skip_to_eol PROTO ((FILE *));
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static int read_string PROTO ((FILE *));
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static int read_number PROTO ((int, FILE *));
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static int read_num_or_name PROTO ((int, FILE *));
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static int intern PROTO ((char *, int));
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void new_parse (name)
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char *name;
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{
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tlname = name;
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lpos = line = 1;
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cur_line = line1;
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prev_line = line2;
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token_line = cur_line;
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cur_line [0] = prev_line [0] = 0;
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warnings_occurred = 0;
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}
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static int get_char (cfile)
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FILE *cfile;
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{
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int c = getc (cfile);
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if (!ugflag) {
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if (c == EOL) {
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if (cur_line == line1) {
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cur_line = line2;
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prev_line = line1;
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} else {
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cur_line = line2;
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prev_line = line1;
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}
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line++;
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lpos = 1;
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cur_line [0] = 0;
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} else if (c != EOF) {
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if (lpos <= 81) {
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cur_line [lpos - 1] = c;
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cur_line [lpos] = 0;
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}
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lpos++;
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}
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} else
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ugflag = 0;
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return c;
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}
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static int get_token (cfile)
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FILE *cfile;
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{
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int c;
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int ttok;
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static char tb [2];
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int l, p, u;
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do {
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l = line;
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p = lpos;
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u = ugflag;
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c = get_char (cfile);
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#ifdef OLD_LEXER
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if (c == '\n' && p == 1 && !u
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&& comment_index < sizeof comments)
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comments [comment_index++] = '\n';
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#endif
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if (!(c == '\n' && eol_token) && isascii (c) && isspace (c))
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continue;
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if (c == '#') {
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#ifdef OLD_LEXER
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if (comment_index < sizeof comments)
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comments [comment_index++] = '#';
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#endif
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skip_to_eol (cfile);
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continue;
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}
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if (c == '"') {
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lexline = l;
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lexchar = p;
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ttok = read_string (cfile);
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break;
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}
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if ((isascii (c) && isdigit (c)) || c == '-') {
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lexline = l;
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lexchar = p;
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ttok = read_number (c, cfile);
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break;
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} else if (isascii (c) && isalpha (c)) {
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lexline = l;
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lexchar = p;
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ttok = read_num_or_name (c, cfile);
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break;
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} else {
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lexline = l;
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lexchar = p;
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tb [0] = c;
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tb [1] = 0;
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tval = tb;
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ttok = c;
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break;
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}
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} while (1);
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return ttok;
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}
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int next_token (rval, cfile)
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char **rval;
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FILE *cfile;
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{
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int rv;
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if (token) {
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if (lexline != tline)
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token_line = cur_line;
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lexchar = tlpos;
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lexline = tline;
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rv = token;
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token = 0;
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} else {
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rv = get_token (cfile);
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token_line = cur_line;
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}
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if (rval)
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*rval = tval;
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#ifdef DEBUG_TOKENS
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fprintf (stderr, "%s:%d ", tval, rv);
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#endif
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return rv;
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}
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int peek_token (rval, cfile)
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char **rval;
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FILE *cfile;
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{
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int x;
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if (!token) {
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tlpos = lexchar;
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tline = lexline;
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token = get_token (cfile);
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if (lexline != tline)
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token_line = prev_line;
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x = lexchar; lexchar = tlpos; tlpos = x;
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x = lexline; lexline = tline; tline = x;
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}
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if (rval)
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*rval = tval;
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#ifdef DEBUG_TOKENS
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fprintf (stderr, "(%s:%d) ", tval, token);
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#endif
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return token;
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}
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static void skip_to_eol (cfile)
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FILE *cfile;
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{
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int c;
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do {
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c = get_char (cfile);
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if (c == EOF)
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return;
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#ifdef OLD_LEXER
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if (comment_index < sizeof (comments))
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comments [comment_index++] = c;
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#endif
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if (c == EOL) {
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return;
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}
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} while (1);
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}
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static int read_string (cfile)
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FILE *cfile;
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{
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int i;
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int bs = 0;
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int c;
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for (i = 0; i < sizeof tokbuf; i++) {
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c = get_char (cfile);
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if (c == EOF) {
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parse_warn ("eof in string constant");
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break;
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}
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if (bs) {
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bs = 0;
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tokbuf [i] = c;
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} else if (c == '\\')
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bs = 1;
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else if (c == '"')
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break;
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else
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tokbuf [i] = c;
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}
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/* Normally, I'd feel guilty about this, but we're talking about
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strings that'll fit in a DHCP packet here... */
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if (i == sizeof tokbuf) {
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parse_warn ("string constant larger than internal buffer");
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--i;
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}
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tokbuf [i] = 0;
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tval = tokbuf;
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return STRING;
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}
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static int read_number (c, cfile)
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int c;
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FILE *cfile;
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{
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int seenx = 0;
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int i = 0;
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int token = NUMBER;
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tokbuf [i++] = c;
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for (; i < sizeof tokbuf; i++) {
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c = get_char (cfile);
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if (!seenx && c == 'x') {
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seenx = 1;
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#ifndef OLD_LEXER
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} else if (isascii (c) && !isxdigit (c) &&
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(c == '-' || c == '_' || isalpha (c))) {
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token = NAME;
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} else if (isascii (c) && !isdigit (c) && isxdigit (c)) {
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token = NUMBER_OR_NAME;
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#endif
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} else if (!isascii (c) || !isxdigit (c)) {
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ungetc (c, cfile);
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ugflag = 1;
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break;
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}
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tokbuf [i] = c;
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}
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if (i == sizeof tokbuf) {
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parse_warn ("numeric token larger than internal buffer");
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--i;
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}
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tokbuf [i] = 0;
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tval = tokbuf;
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return token;
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}
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static int read_num_or_name (c, cfile)
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int c;
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FILE *cfile;
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{
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int i = 0;
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int rv = NUMBER_OR_NAME;
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tokbuf [i++] = c;
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for (; i < sizeof tokbuf; i++) {
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c = get_char (cfile);
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if (!isascii (c) ||
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(c != '-' && c != '_' && !isalnum (c))) {
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ungetc (c, cfile);
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ugflag = 1;
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break;
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}
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if (!isxdigit (c))
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rv = NAME;
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tokbuf [i] = c;
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}
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if (i == sizeof tokbuf) {
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parse_warn ("token larger than internal buffer");
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--i;
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}
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tokbuf [i] = 0;
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tval = tokbuf;
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return intern (tval, rv);
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}
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static int intern (atom, dfv)
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char *atom;
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int dfv;
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{
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if (!isascii (atom [0]))
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return dfv;
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switch (tolower (atom [0])) {
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case 'a':
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if (!strcasecmp (atom + 1, "lways-reply-rfc1048"))
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return ALWAYS_REPLY_RFC1048;
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if (!strcasecmp (atom + 1, "ppend"))
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return APPEND;
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if (!strcasecmp (atom + 1, "llow"))
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return ALLOW;
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if (!strcasecmp (atom + 1, "lias"))
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return ALIAS;
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if (!strcasecmp (atom + 1, "bandoned"))
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return ABANDONED;
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if (!strcasecmp (atom + 1, "uthoritative"))
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return AUTHORITATIVE;
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break;
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case 'b':
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if (!strcasecmp (atom + 1, "ackoff-cutoff"))
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return BACKOFF_CUTOFF;
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if (!strcasecmp (atom + 1, "ootp"))
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return BOOTP;
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if (!strcasecmp (atom + 1, "ooting"))
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return BOOTING;
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if (!strcasecmp (atom + 1, "oot-unknown-clients"))
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return BOOT_UNKNOWN_CLIENTS;
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case 'c':
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if (!strcasecmp (atom + 1, "lass"))
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return CLASS;
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if (!strcasecmp (atom + 1, "iaddr"))
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return CIADDR;
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if (!strcasecmp (atom + 1, "lient-identifier"))
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return CLIENT_IDENTIFIER;
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if (!strcasecmp (atom + 1, "lient-hostname"))
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return CLIENT_HOSTNAME;
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break;
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case 'd':
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if (!strcasecmp (atom + 1, "omain"))
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return DOMAIN;
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if (!strcasecmp (atom + 1, "eny"))
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return DENY;
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if (!strncasecmp (atom + 1, "efault", 6)) {
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if (!atom [7])
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return DEFAULT;
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if (!strcasecmp (atom + 7, "-lease-time"))
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return DEFAULT_LEASE_TIME;
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break;
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}
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if (!strncasecmp (atom + 1, "ynamic-bootp", 12)) {
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if (!atom [13])
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return DYNAMIC_BOOTP;
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if (!strcasecmp (atom + 13, "-lease-cutoff"))
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return DYNAMIC_BOOTP_LEASE_CUTOFF;
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if (!strcasecmp (atom + 13, "-lease-length"))
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return DYNAMIC_BOOTP_LEASE_LENGTH;
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break;
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}
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break;
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case 'e':
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if (!strcasecmp (atom + 1, "thernet"))
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return ETHERNET;
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if (!strcasecmp (atom + 1, "nds"))
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return ENDS;
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if (!strcasecmp (atom + 1, "xpire"))
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return EXPIRE;
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break;
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case 'f':
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if (!strcasecmp (atom + 1, "ilename"))
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return FILENAME;
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if (!strcasecmp (atom + 1, "ixed-address"))
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return FIXED_ADDR;
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if (!strcasecmp (atom + 1, "ddi"))
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return FDDI;
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break;
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case 'g':
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if (!strcasecmp (atom + 1, "iaddr"))
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return GIADDR;
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if (!strcasecmp (atom + 1, "roup"))
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return GROUP;
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if (!strcasecmp (atom + 1, "et-lease-hostnames"))
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return GET_LEASE_HOSTNAMES;
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break;
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case 'h':
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if (!strcasecmp (atom + 1, "ost"))
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return HOST;
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if (!strcasecmp (atom + 1, "ardware"))
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return HARDWARE;
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if (!strcasecmp (atom + 1, "ostname"))
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return HOSTNAME;
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break;
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case 'i':
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if (!strcasecmp (atom + 1, "nitial-interval"))
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return INITIAL_INTERVAL;
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if (!strcasecmp (atom + 1, "nterface"))
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return INTERFACE;
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break;
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case 'l':
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if (!strcasecmp (atom + 1, "ease"))
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return LEASE;
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break;
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case 'm':
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if (!strcasecmp (atom + 1, "ax-lease-time"))
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return MAX_LEASE_TIME;
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if (!strncasecmp (atom + 1, "edi", 3)) {
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if (!strcasecmp (atom + 4, "a"))
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return MEDIA;
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if (!strcasecmp (atom + 4, "um"))
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return MEDIUM;
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break;
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}
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break;
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case 'n':
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if (!strcasecmp (atom + 1, "ameserver"))
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return NAMESERVER;
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if (!strcasecmp (atom + 1, "etmask"))
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return NETMASK;
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if (!strcasecmp (atom + 1, "ext-server"))
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return NEXT_SERVER;
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if (!strcasecmp (atom + 1, "ot"))
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return TOKEN_NOT;
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break;
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case 'o':
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if (!strcasecmp (atom + 1, "ption"))
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return OPTION;
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if (!strcasecmp (atom + 1, "ne-lease-per-client"))
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return ONE_LEASE_PER_CLIENT;
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break;
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case 'p':
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if (!strcasecmp (atom + 1, "repend"))
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return PREPEND;
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if (!strcasecmp (atom + 1, "acket"))
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return PACKET;
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break;
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case 'r':
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if (!strcasecmp (atom + 1, "ange"))
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return RANGE;
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if (!strcasecmp (atom + 1, "equest"))
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return REQUEST;
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if (!strcasecmp (atom + 1, "equire"))
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return REQUIRE;
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if (!strcasecmp (atom + 1, "etry"))
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return RETRY;
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if (!strcasecmp (atom + 1, "enew"))
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return RENEW;
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if (!strcasecmp (atom + 1, "ebind"))
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return REBIND;
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if (!strcasecmp (atom + 1, "eboot"))
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return REBOOT;
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if (!strcasecmp (atom + 1, "eject"))
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return REJECT;
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break;
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case 's':
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if (!strcasecmp (atom + 1, "earch"))
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return SEARCH;
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if (!strcasecmp (atom + 1, "tarts"))
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return STARTS;
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if (!strcasecmp (atom + 1, "iaddr"))
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return SIADDR;
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if (!strcasecmp (atom + 1, "ubnet"))
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return SUBNET;
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if (!strcasecmp (atom + 1, "hared-network"))
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return SHARED_NETWORK;
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if (!strcasecmp (atom + 1, "erver-name"))
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return SERVER_NAME;
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if (!strcasecmp (atom + 1, "erver-identifier"))
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return SERVER_IDENTIFIER;
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if (!strcasecmp (atom + 1, "elect-timeout"))
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return SELECT_TIMEOUT;
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if (!strcasecmp (atom + 1, "end"))
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return SEND;
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if (!strcasecmp (atom + 1, "cript"))
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return SCRIPT;
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if (!strcasecmp (atom + 1, "upersede"))
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return SUPERSEDE;
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break;
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case 't':
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if (!strcasecmp (atom + 1, "imestamp"))
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return TIMESTAMP;
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if (!strcasecmp (atom + 1, "imeout"))
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return TIMEOUT;
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if (!strcasecmp (atom + 1, "oken-ring"))
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return TOKEN_RING;
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break;
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case 'u':
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if (!strncasecmp (atom + 1, "se", 2)) {
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if (!strcasecmp (atom + 3, "r-class"))
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return USER_CLASS;
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if (!strcasecmp (atom + 3, "-host-decl-names"))
|
|
return USE_HOST_DECL_NAMES;
|
|
if (!strcasecmp (atom + 3,
|
|
"-lease-addr-for-default-route"))
|
|
return USE_LEASE_ADDR_FOR_DEFAULT_ROUTE;
|
|
break;
|
|
}
|
|
if (!strcasecmp (atom + 1, "id"))
|
|
return UID;
|
|
if (!strcasecmp (atom + 1, "nknown-clients"))
|
|
return UNKNOWN_CLIENTS;
|
|
break;
|
|
case 'v':
|
|
if (!strcasecmp (atom + 1, "endor-class"))
|
|
return VENDOR_CLASS;
|
|
break;
|
|
case 'y':
|
|
if (!strcasecmp (atom + 1, "iaddr"))
|
|
return YIADDR;
|
|
break;
|
|
}
|
|
return dfv;
|
|
}
|