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new file mode 100644 |
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@@ -0,0 +1,252 @@ |
1 |
+/* |
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+ * $Id$ |
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+ * |
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+ * scanner for cfg files |
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+ */ |
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+ |
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+ |
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+%{ |
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+ #include "cfg.tab.h" |
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+ #include <string.h> |
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+ |
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+ /* states */ |
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+ #define INITIAL_S 0 |
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+ #define COMMENT_S 1 |
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+ #define COMMENT_LN_S 2 |
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+ #define STRING_S 3 |
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+ |
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+ |
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+ static int comment_nest=0; |
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+ static int state=0; |
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+ static char* str=0; |
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+ int line=0; |
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+ int column=0; |
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+ |
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25 |
+ static char* addstr(char*, char**); |
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+ static void count(); |
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+ |
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+ |
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+%} |
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+ |
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+/* start conditions */ |
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+%x STRING1 STRING2 COMMENT COMMENT_LN |
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+ |
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+/* action keywords */ |
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+FORWARD forward |
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+DROP drop |
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+SEND send |
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+LOG log |
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+ERROR error |
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+ROUTE route |
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+/* condition keywords */ |
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+METHOD method |
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+URI uri |
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+SRCIP src_ip |
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+DSTIP dst_ip |
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+/* operators */ |
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+EQUAL = |
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+EQUAL_T == |
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+MATCH ~= |
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+NOT ! |
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+AND "and"|"&&"|"&" |
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+OR "or"|"||"|"|" |
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+ |
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+/* config vars. */ |
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+DEBUG debug |
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+FORK fork |
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+LOGSTDERROR log_stderror |
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+LISTEN listen |
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+DNS dns |
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+REV_DNS rev_dns |
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+ |
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+/* values */ |
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+YES "yes"|"true"|"on"|"enable" |
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+NO "no"|"false"|"off"|"disable" |
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+ |
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+LETTER [a-zA-Z] |
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+DIGIT [0-9] |
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+ALPHANUM {LETTER}|{DIGIT} |
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+NUMBER {DIGIT}+ |
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+ID {LETTER}{ALPHANUM}* |
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+QUOTES \" |
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+TICK \' |
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+SLASH "/" |
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+SEMICOLON ; |
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+RPAREN \) |
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+LPAREN \( |
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+LBRACE \{ |
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+RBRACE \} |
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+LBRACK \[ |
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+RBRACK \] |
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+COMMA , |
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+DOT \. |
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+CR \n |
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+ |
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+ |
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+ |
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+COM_LINE # |
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+COM_START "/\*" |
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+COM_END "\*/" |
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+ |
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+EAT_ABLE [\ \t\b\r] |
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+ |
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+%% |
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+ |
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+ |
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+<INITIAL>{EAT_ABLE} { count(); } |
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+ |
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+<INITIAL>{FORWARD} {count(); yylval.strval=yytext; return FORWARD; } |
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+<INITIAL>{DROP} { count(); yylval.strval=yytext; return DROP; } |
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+<INITIAL>{SEND} { count(); yylval.strval=yytext; return SEND; } |
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+<INITIAL>{LOG} { count(); yylval.strval=yytext; return LOG; } |
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+<INITIAL>{ERROR} { count(); yylval.strval=yytext; return ERROR; } |
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+<INITIAL>{ROUTE} { count(); yylval.strval=yytext; return ROUTE; } |
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+ |
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+<INITIAL>{METHOD} { count(); yylval.strval=yytext; return METHOD; } |
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+<INITIAL>{URI} { count(); yylval.strval=yytext; return URI; } |
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+<INITIAL>{SRCIP} { count(); yylval.strval=yytext; return SRCIP; } |
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+<INITIAL>{DSTIP} { count(); yylval.strval=yytext; return DSTIP; } |
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+ |
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+<INITIAL>{DEBUG} { count(); yylval.strval=yytext; return DEBUG; } |
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+<INITIAL>{FORK} { count(); yylval.strval=yytext; return FORK; } |
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+<INITIAL>{LOGSTDERROR} { yylval.strval=yytext; return LOGSTDERROR; } |
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+<INITIAL>{LISTEN} { count(); yylval.strval=yytext; return LISTEN; } |
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+<INITIAL>{DNS} { count(); yylval.strval=yytext; return DNS; } |
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+<INITIAL>{REV_DNS} { count(); yylval.strval=yytext; return REV_DNS; } |
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+ |
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+<INITIAL>{EQUAL} { count(); return EQUAL; } |
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+<INITIAL>{EQUAL_T} { count(); return EQUAL_T; } |
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+<INITIAL>{MATCH} { count(); return MATCH; } |
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+<INITIAL>{NOT} { count(); return NOT; } |
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+<INITIAL>{AND} { count(); return AND; } |
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+<INITIAL>{OR} { count(); return OR; } |
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+ |
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+<INITIAL>{NUMBER} { count(); yylval.intval=atoi(yytext); |
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+ return NUMBER; } |
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+<INITIAL>{YES} { count(); yylval.intval=1; return NUMBER; } |
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+<INITIAL>{NO} { count(); yylval.intval=0; return NUMBER; } |
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+ |
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+<INITIAL>{COMMA} { count(); return COMMA; } |
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+<INITIAL>{SEMICOLON} { count(); return SEMICOLON; } |
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+<INITIAL>{RPAREN} { count(); return RPAREN; } |
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+<INITIAL>{LPAREN} { count(); return LPAREN; } |
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+<INITIAL>{LBRACE} { count(); return LBRACE; } |
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+<INITIAL>{RBRACE} { count(); return RBRACE; } |
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+<INITIAL>{LBRACK} { count(); return LBRACK; } |
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+<INITIAL>{RBRACK} { count(); return RBRACK; } |
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+<INITIAL>{SLASH} { count(); return SLASH; } |
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+<INITIAL>{DOT} { count(); return DOT; } |
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+<INITIAL>\\{CR} {count(); } /* eat the escaped CR */ |
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+<INITIAL>{CR} { count(); return CR; } |
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+ |
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+ |
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+<INITIAL>{QUOTES} { count(); state=STRING_S; BEGIN(STRING1); } |
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+<INITIAL>{TICK} { count(); state=STRING_S; BEGIN(STRING2); } |
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+ |
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+ |
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+<STRING1>{QUOTES} { count(); state=INITIAL_S; BEGIN(INITIAL); |
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+ yytext[yyleng-1]=0; yyleng--; |
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+ addstr(yytext, &str); |
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+ if (str){ |
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+ printf("Found string1 <%s>\n", str); |
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+ yyleng=strlen(str)+1; |
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+ memcpy(yytext, str, yyleng); |
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+ free(str); |
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+ str=0; |
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+ }else{ |
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+ printf("WARNING: empty string\n"); |
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+ } |
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+ yylval.strval=yytext; return STRING; |
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+ } |
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+<STRING2>{TICK} { count(); state=INITIAL_S; BEGIN(INITIAL); |
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+ yytext[yyleng-1]=0; yyleng--; |
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+ printf("Found string1 <%s>\n", yytext); |
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+ yylval.strval=yytext; return STRING; |
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+ } |
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+<STRING2>.|{EAT_ABLE}|{CR} { yymore(); } |
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+ |
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+<STRING1>\\n { count(); yytext[yyleng-2]='\n';yytext[yyleng-1]=0; |
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+ yyleng--; addstr(yytext, &str); } |
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+<STRING1>\\t { count(); yytext[yyleng-2]='\t';yytext[yyleng-1]=0; |
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+ yyleng--; addstr(yytext, &str); } |
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+<STRING1>\\\\ { count(); yytext[yyleng-2]='\\';yytext[yyleng-1]=0; |
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+ yyleng--; addstr(yytext, &str); } |
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+<STRING1>.|{EAT_ABLE}|{CR} { yymore(); } |
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+ |
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+ |
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+<INITIAL,COMMENT>{COM_START} { count(); comment_nest++; state=COMMENT_S; |
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+ BEGIN(COMMENT); } |
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+<COMMENT>{COM_END} { count(); comment_nest--; |
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+ if (comment_nest==0){ |
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+ state=INITIAL_S; |
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+ BEGIN(INITIAL); |
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+ } |
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+ } |
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+<COMMENT>.|{EAT_ABLE}|{CR} { count(); }; |
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+ |
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+<INITIAL>{COM_LINE}.*{CR} { count(); } |
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+ |
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+<INITIAL>{ID} { count(); yylval.strval=yytext; return ID; } |
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+ |
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+ |
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+<<EOF>> { |
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+ switch(state){ |
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+ case STRING_S: |
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+ printf("Unexpected EOF: closed string\n"); |
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+ if (str) {free(str); str=0;} |
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+ break; |
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+ case COMMENT_S: |
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+ printf("Unexpected EOF:%d comments open\n", comment_nest); |
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+ break; |
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+ case COMMENT_LN_S: |
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+ printf("Unexpected EOF: comment line open\n"); |
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+ break; |
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+ } |
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+ return 0; |
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+ } |
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+ |
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+%% |
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+ |
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+static char* addstr(char * src, char ** dest) |
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+{ |
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+ char *tmp; |
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+ int len1, len2; |
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+ |
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+ if (*dest==0){ |
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+ *dest=strdup(src); |
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+ }else{ |
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+ len1=strlen(*dest); |
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+ len2=strlen(src); |
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+ tmp=malloc(len1+len2+1); |
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+ if (tmp==0) goto error; |
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+ memcpy(tmp, *dest, len1); |
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+ memcpy(tmp+len1, src, len2); |
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+ tmp[len1+len2]=0; |
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+ free(*dest); |
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+ *dest=tmp; |
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+ } |
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+ return *dest; |
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+error: |
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+ fprintf(stderr, "lex:addstr: memory allocation error\n"); |
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+ return 0; |
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+} |
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+ |
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+ |
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+ |
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+static void count() |
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+{ |
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+ int i; |
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+ |
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+ for (i=0; i<yyleng;i++){ |
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+ if (yytext[i]=='\n'){ |
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+ line++; |
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+ column=0; |
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+ }else if (yytext[i]=='\t'){ |
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+ column+=8 -(column%8); |
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+ }else{ |
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+ column++; |
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+ } |
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+ } |
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+} |
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+ |
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+ |
0 | 253 |
new file mode 100644 |
... | ... |
@@ -0,0 +1,183 @@ |
1 |
+/* |
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2 |
+ * $Id$ |
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3 |
+ * |
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4 |
+ * cfg grammar |
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+ */ |
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+ |
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+%{ |
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+ |
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+%} |
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+ |
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+%union { |
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+ int intval; |
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+ char* strval; |
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+} |
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+ |
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+/* terminals */ |
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+ |
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+ |
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+/* keywors */ |
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+%token FORWARD |
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+%token SEND |
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+%token DROP |
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23 |
+%token LOG |
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+%token ERROR |
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25 |
+%token ROUTE |
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+%token METHOD |
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+%token URI |
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+%token SRCIP |
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+%token DSTIP |
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+ |
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+/* config vars. */ |
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+%token DEBUG |
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+%token FORK |
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+%token LOGSTDERROR |
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+%token LISTEN |
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+%token DNS |
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+%token REV_DNS |
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+ |
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+ |
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+/* operators */ |
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+%nonassoc EQUAL |
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+%nonassoc EQUAL_T |
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+%nonassoc MATCH |
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+%left NOT |
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+%left AND |
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+%left OR |
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+ |
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+/* values */ |
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+%token NUMBER |
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+%token ID |
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+%token STRING |
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+ |
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+/* other */ |
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+%token COMMA |
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+%token SEMICOLON |
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+%token RPAREN |
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57 |
+%token LPAREN |
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58 |
+%token LBRACE |
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59 |
+%token RBRACE |
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60 |
+%token LBRACK |
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+%token RBRACK |
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62 |
+%token SLASH |
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63 |
+%token DOT |
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64 |
+%token CR |
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+ |
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+ |
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67 |
+/*non-terminals */ |
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+ |
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+ |
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+ |
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71 |
+%% |
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+ |
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+ |
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+cfg: statements |
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+ ; |
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+ |
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+statements: statements statement {printf("got <> <>\n");} |
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+ | statement {printf("got a statement<>\n"); } |
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+ ; |
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+ |
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81 |
+statement: assign_stm CR |
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82 |
+ | route_stm CR |
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83 |
+ | CR /* null statement*/ |
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84 |
+ ; |
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85 |
+ |
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+assign_stm: DEBUG EQUAL NUMBER | |
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87 |
+ FORK EQUAL NUMBER | |
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88 |
+ LOGSTDERROR EQUAL NUMBER | |
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89 |
+ DNS EQUAL NUMBER | |
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90 |
+ REV_DNS EQUAL NUMBER | |
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91 |
+ LISTEN EQUAL ipv4 | |
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92 |
+ LISTEN EQUAL ID | |
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93 |
+ LISTEN EQUAL STRING |
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94 |
+ ; |
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95 |
+ |
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96 |
+ |
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97 |
+ipv4: NUMBER DOT NUMBER DOT NUMBER DOT NUMBER |
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98 |
+ ; |
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99 |
+ |
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100 |
+route_stm: ROUTE LBRACE rules RBRACE | |
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101 |
+ ROUTE LBRACK NUMBER RBRACK LBRACE rules RBRACE |
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102 |
+ ; |
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103 |
+ |
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104 |
+rules: rules rule | |
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105 |
+ rule |
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106 |
+ ; |
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107 |
+ |
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108 |
+rule: condition actions CR |
|
109 |
+ | CR /* null rule */ |
|
110 |
+ ; |
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111 |
+ |
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112 |
+condition: exp_elem | |
|
113 |
+ LPAREN exp RPAREN |
|
114 |
+ ; |
|
115 |
+ |
|
116 |
+exp: exp AND condition | |
|
117 |
+ exp OR condition | |
|
118 |
+ NOT condition | |
|
119 |
+ condition |
|
120 |
+ ; |
|
121 |
+ |
|
122 |
+exp_elem: METHOD EQUAL_T STRING | |
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123 |
+ METHOD EQUAL_T ID | |
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124 |
+ METHOD MATCH STRING | |
|
125 |
+ METHOD MATCH ID | |
|
126 |
+ URI EQUAL_T STRING | |
|
127 |
+ URI EQUAL_T ID | |
|
128 |
+ URI MATCH STRING | |
|
129 |
+ URI MATCH ID | |
|
130 |
+ SRCIP EQUAL_T net4 | |
|
131 |
+ SRCIP EQUAL_T STRING | |
|
132 |
+ SRCIP EQUAL_T host | |
|
133 |
+ SRCIP MATCH STRING |
|
134 |
+ DSTIP EQUAL_T net4 | |
|
135 |
+ DSTIP EQUAL_T STRING | |
|
136 |
+ DSTIP MATCH STRING |
|
137 |
+ ; |
|
138 |
+ |
|
139 |
+net4: ipv4 SLASH ipv4 | |
|
140 |
+ ipv4 SLASH NUMBER | |
|
141 |
+ ipv4 |
|
142 |
+ ; |
|
143 |
+ |
|
144 |
+host: ID | |
|
145 |
+ host DOT ID |
|
146 |
+ ; |
|
147 |
+ |
|
148 |
+ |
|
149 |
+actions: actions action | |
|
150 |
+ action |
|
151 |
+ ; |
|
152 |
+ |
|
153 |
+action: cmd SEMICOLON | |
|
154 |
+ SEMICOLON /* null action */ |
|
155 |
+ |
|
156 |
+cmd: FORWARD LPAREN host RPAREN | |
|
157 |
+ FORWARD LPAREN STRING RPAREN | |
|
158 |
+ FORWARD LPAREN ipv4 RPAREN | |
|
159 |
+ SEND LPAREN host RPAREN | |
|
160 |
+ SEND LPAREN STRING RPAREN | |
|
161 |
+ SEND LPAREN ipv4 RPAREN | |
|
162 |
+ DROP LPAREN RPAREN | |
|
163 |
+ DROP | |
|
164 |
+ LOG LPAREN STRING RPAREN | |
|
165 |
+ ERROR LPAREN STRING COMMA STRING RPAREN | |
|
166 |
+ ROUTE LPAREN NUMBER RPAREN |
|
167 |
+ ; |
|
168 |
+ |
|
169 |
+ |
|
170 |
+%% |
|
171 |
+ |
|
172 |
+extern int line; |
|
173 |
+extern int column; |
|
174 |
+yyerror(char* s) |
|
175 |
+{ |
|
176 |
+ fprintf(stderr, "parse error (%d,%d): %s\n", line, column, s); |
|
177 |
+} |
|
178 |
+ |
|
179 |
+int main(int argc, char ** argv) |
|
180 |
+{ |
|
181 |
+ if (yyparse()!=0) |
|
182 |
+ fprintf(stderr, "parsing error\n"); |
|
183 |
+} |