GitList
Browse code

- new config parser (not finished yet)

Andrei Pelinescu-Onciul authored on 18/09/2001 04:56:43
Showing 2 changed files
cfg.lex
History View file @ 3c1a8ef8f8
1 1 
new file mode 100644
... ... 
@@ -0,0 +1,252 @@
0 
+/*
1 
+ * $Id$
2 
+ *
3 
+ * scanner for cfg files
4 
+ */
5 
+
6 
+
7 
+%{
8 
+	#include "cfg.tab.h"
9 
+	#include <string.h>
10 
+
11 
+	/* states */
12 
+	#define INITIAL_S		0
13 
+	#define COMMENT_S		1
14 
+	#define COMMENT_LN_S	2
15 
+	#define STRING_S		3
16 
+
17 
+
18 
+	static int comment_nest=0;
19 
+	static int state=0;
20 
+	static char* str=0;
21 
+	int line=0;
22 
+	int column=0;
23 
+
24 
+	static char* addstr(char*, char**);
25 
+	static void count();
26 
+
27 
+
28 
+%}
29 
+
30 
+/* start conditions */
31 
+%x STRING1 STRING2 COMMENT COMMENT_LN
32 
+
33 
+/* action keywords */
34 
+FORWARD	forward
35 
+DROP	drop
36 
+SEND	send
37 
+LOG		log
38 
+ERROR	error
39 
+ROUTE	route
40 
+/* condition keywords */
41 
+METHOD	method
42 
+URI		uri
43 
+SRCIP	src_ip
44 
+DSTIP	dst_ip
45 
+/* operators */
46 
+EQUAL	=
47 
+EQUAL_T	==
48 
+MATCH	~=
49 
+NOT		!
50 
+AND		"and"|"&&"|"&"
51 
+OR		"or"|"||"|"|"
52 
+
53 
+/* config vars. */
54 
+DEBUG	debug
55 
+FORK	fork
56 
+LOGSTDERROR	log_stderror
57 
+LISTEN		listen
58 
+DNS		 dns
59 
+REV_DNS	 rev_dns
60 
+
61 
+/* values */
62 
+YES			"yes"|"true"|"on"|"enable"
63 
+NO			"no"|"false"|"off"|"disable"
64 
+
65 
+LETTER		[a-zA-Z]
66 
+DIGIT		[0-9]
67 
+ALPHANUM	{LETTER}|{DIGIT}
68 
+NUMBER		{DIGIT}+
69 
+ID			{LETTER}{ALPHANUM}*
70 
+QUOTES		\"
71 
+TICK		\'
72 
+SLASH		"/"
73 
+SEMICOLON	;
74 
+RPAREN		\)
75 
+LPAREN		\(
76 
+LBRACE		\{
77 
+RBRACE		\}
78 
+LBRACK		\[
79 
+RBRACK		\]
80 
+COMMA		,
81 
+DOT			\.
82 
+CR			\n
83 
+
84 
+
85 
+
86 
+COM_LINE	#
87 
+COM_START	"/\*"
88 
+COM_END		"\*/"
89 
+
90 
+EAT_ABLE	[\ \t\b\r]
91 
+
92 
+%%
93 
+
94 
+
95 
+<INITIAL>{EAT_ABLE}	{ count(); }
96 
+
97 
+<INITIAL>{FORWARD}	{count(); yylval.strval=yytext; return FORWARD; }
98 
+<INITIAL>{DROP}	{ count(); yylval.strval=yytext; return DROP; }
99 
+<INITIAL>{SEND}	{ count(); yylval.strval=yytext; return SEND; }
100 
+<INITIAL>{LOG}	{ count(); yylval.strval=yytext; return LOG; }
101 
+<INITIAL>{ERROR}	{ count(); yylval.strval=yytext; return ERROR; }
102 
+<INITIAL>{ROUTE}	{ count(); yylval.strval=yytext; return ROUTE; }
103 
+
104 
+<INITIAL>{METHOD}	{ count(); yylval.strval=yytext; return METHOD; }
105 
+<INITIAL>{URI}	{ count(); yylval.strval=yytext; return URI; }
106 
+<INITIAL>{SRCIP}	{ count(); yylval.strval=yytext; return SRCIP; }
107 
+<INITIAL>{DSTIP}	{ count(); yylval.strval=yytext; return DSTIP; }
108 
+
109 
+<INITIAL>{DEBUG}	{ count(); yylval.strval=yytext; return DEBUG; }
110 
+<INITIAL>{FORK}		{ count(); yylval.strval=yytext; return FORK; }
111 
+<INITIAL>{LOGSTDERROR}	{ yylval.strval=yytext; return LOGSTDERROR; }
112 
+<INITIAL>{LISTEN}	{ count(); yylval.strval=yytext; return LISTEN; }
113 
+<INITIAL>{DNS}	{ count(); yylval.strval=yytext; return DNS; }
114 
+<INITIAL>{REV_DNS}	{ count(); yylval.strval=yytext; return REV_DNS; }
115 
+
116 
+<INITIAL>{EQUAL}	{ count(); return EQUAL; }
117 
+<INITIAL>{EQUAL_T}	{ count(); return EQUAL_T; }
118 
+<INITIAL>{MATCH}	{ count(); return MATCH; }
119 
+<INITIAL>{NOT}		{ count(); return NOT; }
120 
+<INITIAL>{AND}		{ count(); return AND; }
121 
+<INITIAL>{OR}		{ count(); return OR;  }
122 
+
123 
+<INITIAL>{NUMBER}		{ count(); yylval.intval=atoi(yytext);
124 
+							return NUMBER; }
125 
+<INITIAL>{YES}			{ count(); yylval.intval=1; return NUMBER; }
126 
+<INITIAL>{NO}			{ count(); yylval.intval=0; return NUMBER; }
127 
+
128 
+<INITIAL>{COMMA}		{ count(); return COMMA; }
129 
+<INITIAL>{SEMICOLON}	{ count(); return SEMICOLON; }
130 
+<INITIAL>{RPAREN}	{ count(); return RPAREN; }
131 
+<INITIAL>{LPAREN}	{ count(); return LPAREN; }
132 
+<INITIAL>{LBRACE}	{ count(); return LBRACE; }
133 
+<INITIAL>{RBRACE}	{ count(); return RBRACE; }
134 
+<INITIAL>{LBRACK}	{ count(); return LBRACK; }
135 
+<INITIAL>{RBRACK}	{ count(); return RBRACK; }
136 
+<INITIAL>{SLASH}	{ count(); return SLASH; }
137 
+<INITIAL>{DOT}		{ count(); return DOT; }
138 
+<INITIAL>\\{CR}		{count(); } /* eat the escaped CR */
139 
+<INITIAL>{CR}		{ count(); return CR; }
140 
+
141 
+
142 
+<INITIAL>{QUOTES} { count(); state=STRING_S; BEGIN(STRING1); }
143 
+<INITIAL>{TICK} { count(); state=STRING_S; BEGIN(STRING2); }
144 
+
145 
+
146 
+<STRING1>{QUOTES} { count(); state=INITIAL_S; BEGIN(INITIAL);
147 
+						yytext[yyleng-1]=0; yyleng--;
148 
+						addstr(yytext, &str);
149 
+						if (str){
150 
+							printf("Found string1 <%s>\n", str);
151 
+							yyleng=strlen(str)+1;
152 
+							memcpy(yytext, str, yyleng);
153 
+							free(str);
154 
+							str=0;
155 
+						}else{
156 
+							printf("WARNING: empty string\n");
157 
+						}
158 
+						yylval.strval=yytext; return STRING;
159 
+					}
160 
+<STRING2>{TICK}  { count(); state=INITIAL_S; BEGIN(INITIAL);
161 
+						yytext[yyleng-1]=0; yyleng--;
162 
+						printf("Found string1 <%s>\n", yytext);
163 
+						yylval.strval=yytext; return STRING;
164 
+					}
165 
+<STRING2>.|{EAT_ABLE}|{CR}	{ yymore(); }
166 
+
167 
+<STRING1>\\n		{ count(); yytext[yyleng-2]='\n';yytext[yyleng-1]=0;
168 
+						yyleng--; addstr(yytext, &str); }
169 
+<STRING1>\\t		{ count(); yytext[yyleng-2]='\t';yytext[yyleng-1]=0;
170 
+						yyleng--; addstr(yytext, &str); }
171 
+<STRING1>\\\\		{ count(); yytext[yyleng-2]='\\';yytext[yyleng-1]=0;
172 
+						yyleng--; addstr(yytext, &str); }
173 
+<STRING1>.|{EAT_ABLE}|{CR}	{ yymore(); }
174 
+
175 
+
176 
+<INITIAL,COMMENT>{COM_START}	{ count(); comment_nest++; state=COMMENT_S;
177 
+										BEGIN(COMMENT); }
178 
+<COMMENT>{COM_END}				{ count(); comment_nest--;
179 
+										if (comment_nest==0){
180 
+											state=INITIAL_S;
181 
+											BEGIN(INITIAL);
182 
+										}
183 
+								}
184 
+<COMMENT>.|{EAT_ABLE}|{CR}				{ count(); };
185 
+
186 
+<INITIAL>{COM_LINE}.*{CR}	{ count(); }
187 
+
188 
+<INITIAL>{ID}			{ count(); yylval.strval=yytext; return ID; }
189 
+
190 
+
191 
+<<EOF>>							{
192 
+									switch(state){
193 
+										case STRING_S:
194 
+											printf("Unexpected EOF: closed string\n");
195 
+											if (str) {free(str); str=0;}
196 
+											break;
197 
+										case COMMENT_S:
198 
+											printf("Unexpected EOF:%d comments open\n", comment_nest);
199 
+											break;
200 
+										case COMMENT_LN_S:
201 
+											printf("Unexpected EOF: comment line open\n");
202 
+											break;
203 
+									}
204 
+									return 0;
205 
+								}
206 
+
207 
+%%
208 
+
209 
+static char* addstr(char * src, char ** dest)
210 
+{
211 
+	char *tmp;
212 
+	int len1, len2;
213 
+
214 
+	if (*dest==0){
215 
+		*dest=strdup(src);
216 
+	}else{
217 
+		len1=strlen(*dest);
218 
+		len2=strlen(src);
219 
+		tmp=malloc(len1+len2+1);
220 
+		if (tmp==0) goto error;
221 
+		memcpy(tmp, *dest, len1);
222 
+		memcpy(tmp+len1, src, len2);
223 
+		tmp[len1+len2]=0;
224 
+		free(*dest);
225 
+		*dest=tmp;
226 
+	}
227 
+	return *dest;
228 
+error:
229 
+	fprintf(stderr, "lex:addstr: memory allocation error\n");
230 
+	return 0;
231 
+}
232 
+
233 
+
234 
+
235 
+static void count()
236 
+{
237 
+	int i;
238 
+
239 
+	for (i=0; i<yyleng;i++){
240 
+		if (yytext[i]=='\n'){
241 
+			line++;
242 
+			column=0;
243 
+		}else if (yytext[i]=='\t'){
244 
+			column+=8 -(column%8);
245 
+		}else{
246 
+			column++;
247 
+		}
248 
+	}
249 
+}
250 
+
251 
+
cfg.y
History View file @ 3c1a8ef8f8
0 252 
new file mode 100644
... ... 
@@ -0,0 +1,183 @@
0 
+/*
1 
+ * $Id$
2 
+ *
3 
+ *  cfg grammar
4 
+ */
5 
+
6 
+%{
7 
+
8 
+%}
9 
+
10 
+%union {
11 
+	int intval;
12 
+	char* strval;
13 
+}
14 
+
15 
+/* terminals */
16 
+
17 
+
18 
+/* keywors */
19 
+%token FORWARD
20 
+%token SEND
21 
+%token DROP
22 
+%token LOG
23 
+%token ERROR
24 
+%token ROUTE
25 
+%token METHOD
26 
+%token URI
27 
+%token SRCIP
28 
+%token DSTIP
29 
+
30 
+/* config vars. */
31 
+%token DEBUG
32 
+%token FORK
33 
+%token LOGSTDERROR
34 
+%token LISTEN
35 
+%token DNS
36 
+%token REV_DNS
37 
+
38 
+
39 
+/* operators */
40 
+%nonassoc EQUAL
41 
+%nonassoc EQUAL_T
42 
+%nonassoc MATCH
43 
+%left NOT
44 
+%left AND
45 
+%left OR
46 
+
47 
+/* values */
48 
+%token NUMBER
49 
+%token ID
50 
+%token STRING
51 
+
52 
+/* other */
53 
+%token COMMA
54 
+%token SEMICOLON
55 
+%token RPAREN
56 
+%token LPAREN
57 
+%token LBRACE
58 
+%token RBRACE
59 
+%token LBRACK
60 
+%token RBRACK
61 
+%token SLASH
62 
+%token DOT
63 
+%token CR
64 
+
65 
+
66 
+/*non-terminals */
67 
+
68 
+
69 
+
70 
+%%
71 
+
72 
+
73 
+cfg:	statements
74 
+	;
75 
+
76 
+statements:	statements statement {printf("got <> <>\n");}
77 
+			| statement {printf("got a statement<>\n"); }
78 
+	;
79 
+
80 
+statement:	assign_stm CR
81 
+			| route_stm CR
82 
+			| CR	/* null statement*/
83 
+	;
84 
+
85 
+assign_stm:	DEBUG EQUAL NUMBER |
86 
+			FORK  EQUAL NUMBER |
87 
+			LOGSTDERROR EQUAL NUMBER |
88 
+			DNS EQUAL NUMBER |
89 
+			REV_DNS EQUAL NUMBER |
90 
+			LISTEN EQUAL ipv4 |
91 
+			LISTEN EQUAL ID |
92 
+			LISTEN EQUAL STRING
93 
+	;
94 
+
95 
+
96 
+ipv4:	NUMBER DOT NUMBER DOT NUMBER DOT NUMBER
97 
+	;
98 
+
99 
+route_stm:	ROUTE LBRACE rules RBRACE |
100 
+			ROUTE LBRACK NUMBER RBRACK LBRACE rules RBRACE
101 
+	;
102 
+
103 
+rules:	rules rule |
104 
+		rule
105 
+	 ;
106 
+
107 
+rule:	condition	actions CR
108 
+	 	| CR  /* null rule */
109 
+	;
110 
+
111 
+condition:	exp_elem |
112 
+			LPAREN exp RPAREN
113 
+	;
114 
+
115 
+exp:	exp AND condition |
116 
+		exp OR  condition |
117 
+		NOT condition |
118 
+		condition
119 
+	;
120 
+
121 
+exp_elem:	METHOD EQUAL_T STRING |
122 
+			METHOD EQUAL_T ID |
123 
+			METHOD MATCH STRING |
124 
+			METHOD MATCH ID |
125 
+			URI EQUAL_T STRING |
126 
+			URI EQUAL_T ID |
127 
+			URI MATCH STRING |
128 
+			URI MATCH ID |
129 
+			SRCIP EQUAL_T net4 |
130 
+			SRCIP EQUAL_T STRING |
131 
+			SRCIP EQUAL_T host |
132 
+			SRCIP MATCH STRING
133 
+			DSTIP EQUAL_T net4 |
134 
+			DSTIP EQUAL_T STRING |
135 
+			DSTIP MATCH STRING
136 
+	;
137 
+
138 
+net4:	ipv4 SLASH ipv4 |
139 
+		ipv4 SLASH NUMBER |
140 
+		ipv4
141 
+	;
142 
+
143 
+host:	ID |
144 
+		host DOT ID
145 
+	;
146 
+
147 
+
148 
+actions:	actions action |
149 
+			action
150 
+	;
151 
+
152 
+action:		cmd SEMICOLON |
153 
+			SEMICOLON /* null action */
154 
+
155 
+cmd:		FORWARD LPAREN host RPAREN |
156 
+			FORWARD LPAREN STRING RPAREN |
157 
+			FORWARD LPAREN ipv4 RPAREN |
158 
+			SEND LPAREN host RPAREN |
159 
+			SEND LPAREN STRING RPAREN |
160 
+			SEND LPAREN ipv4 RPAREN |
161 
+			DROP LPAREN RPAREN |
162 
+			DROP |
163 
+			LOG LPAREN STRING RPAREN |
164 
+			ERROR LPAREN STRING COMMA STRING RPAREN |
165 
+			ROUTE LPAREN NUMBER RPAREN
166 
+	;
167 
+
168 
+
169 
+%%
170 
+
171 
+extern int line;
172 
+extern int column;
173 
+yyerror(char* s)
174 
+{
175 
+	fprintf(stderr, "parse error (%d,%d): %s\n", line, column, s);
176 
+}
177 
+
178 
+int main(int argc, char ** argv)
179 
+{
180 
+	if (yyparse()!=0)
181 
+		fprintf(stderr, "parsing error\n");
182 
+}