mirror of
https://gitlab.nic.cz/labs/bird.git
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248 lines
6.2 KiB
Plaintext
248 lines
6.2 KiB
Plaintext
/*
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* BIRD - filters
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*
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* Copyright 1998 Pavel Machek
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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CF_HDR
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#include "nest/bird.h"
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#include "lib/resource.h"
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#include "lib/socket.h"
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#include "lib/timer.h"
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#include "nest/protocol.h"
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#include "nest/iface.h"
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#include "nest/route.h"
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CF_DECLS
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CF_KEYWORDS(FUNCTION, PRINT, CONST,
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ACCEPT, REJECT, ERROR, QUITBIRD,
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INT, BOOL, IP, PREFIX, PAIR, SET, STRING,
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IF, THEN, ELSE,
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TRUE, FALSE,
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RTA, FROM, GW, NET,
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LEN,
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IMPOSSIBLE,
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FILTER
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)
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%type <x> term block cmds cmd function_body ifthen constant print_one print_list
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%type <f> filter filter_body
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%type <i> type break_command
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%type <e> set_item set_items
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%type <v> set_atom
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CF_GRAMMAR
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CF_ADDTO(conf, filter_def)
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filter_def:
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FILTER SYM filter_body {
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if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
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$2->class = SYM_FILTER;
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$2->def = $3;
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$3->name = $2->name;
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printf( "We have new filter defined (%s)\n", $2->name )
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}
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;
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type:
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INT { $$ = T_INT; }
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| BOOL { $$ = T_BOOL; }
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| IP { $$ = T_IP; }
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| PREFIX { $$ = T_PREFIX; }
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| PAIR { $$ = T_PAIR; }
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| STRING { $$ = T_STRING; }
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| type SET {
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switch ($1) {
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default:
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cf_error( "You can not create sets of this type\n" );
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case T_INT: case T_IP: case T_PREFIX: case T_PAIR:
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}
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$$ = $1 | T_SET;
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}
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;
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decls: /* EMPTY */
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| type SYM ';' decls {
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if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
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$2->class = SYM_VARIABLE | $1;
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printf( "New variable %s type %x\n", $2->name, $1 );
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}
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;
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filter_body:
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function_body {
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struct filter *f = cfg_alloc(sizeof(struct filter));
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f->name = NULL;
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f->root = $1;
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$$ = f;
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}
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;
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filter:
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SYM {
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if ($1->class != SYM_FILTER) cf_error("No such filter");
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$$ = $1->def;
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}
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| filter_body
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;
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function_params:
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'(' decls ')' { printf( "Have function parameters\n" ); }
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;
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function_body:
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decls '{' cmds '}' {
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$$ = $3;
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}
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;
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CF_ADDTO(conf, function_def)
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function_def:
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FUNCTION SYM function_params function_body {
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extern struct f_inst *startup_func;
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if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
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$2->class = SYM_FUNCTION;
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$2->def = $4;
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if (!strcasecmp($2->name, "startup"))
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startup_func = $4;
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printf("Hmm, we've got one function here - %s\n", $2->name);
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}
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;
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/* Programs */
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cmds: /* EMPTY */ { $$ = NULL; }
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| cmd cmds {
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if ($1) {
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$1->next = $2;
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$$ = $1;
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} else $$ = $2;
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}
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;
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block:
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cmd {
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$$=$1;
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}
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| '{' cmds '}' {
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$$=$2;
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}
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;
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set_atom:
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NUM { $$.type = T_INT; $$.val.i = $1; }
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| IPA { $$.type = T_IP; $$.val.ip = $1; }
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;
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set_item:
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set_atom { $$ = f_new_tree(); $$->from = $$->to = $1 }
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| set_atom '.' '.' set_atom { $$ = f_new_tree(); $$->from = $1; $$->to = $4; }
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;
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set_items:
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set_item { $$ = $1; }
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| set_items ',' set_item { $$ = $3; $$->left = $1; }
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;
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constant:
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CONST '(' expr ')' { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_INT; $$->a2.i = $3; }
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| NUM { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_INT; $$->a2.i = $1; }
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| TRUE { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_BOOL; $$->a2.i = 1; }
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| FALSE { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_BOOL; $$->a2.i = 0; }
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| TEXT { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_STRING; $$->a2.p = $1; }
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| IPA { struct f_val * val; val = cfg_alloc(sizeof(struct f_val)); $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; val->type = T_IP; val->val.ip = $1; }
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| '[' set_items ']' { printf( "We've got a set here..." ); $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_SET; $$->a2.p = build_tree($2); printf( "ook\n" ); }
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;
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term:
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term '+' term { $$ = f_new_inst(); $$->code = '+'; $$->a1.p = $1; $$->a2.p = $3; }
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| term '=' term { $$ = f_new_inst(); $$->code = '=='; $$->a1.p = $1; $$->a2.p = $3; }
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| term '!' '=' term { $$ = f_new_inst(); $$->code = '!='; $$->a1.p = $1; $$->a2.p = $4; }
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| term '<' term { $$ = f_new_inst(); $$->code = '<'; $$->a1.p = $1; $$->a2.p = $3; }
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| term '<' '=' term { $$ = f_new_inst(); $$->code = '<='; $$->a1.p = $1; $$->a2.p = $4; }
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| term '>' term { $$ = f_new_inst(); $$->code = '<'; $$->a1.p = $3; $$->a2.p = $1; }
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| term '>' '=' term { $$ = f_new_inst(); $$->code = '<='; $$->a1.p = $4; $$->a2.p = $1; }
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| term '~' term { $$ = f_new_inst(); $$->code = '~'; $$->a1.p = $1; $$->a2.p = $3; }
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| SYM {
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$$ = f_new_inst();
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switch ($1->class) {
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case SYM_VARIABLE | T_INT:
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$$->code = 'i';
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$$->a1.i = T_INT;
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$$->a2.p = &($1->aux);
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break;
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default:
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cf_error("Can not use this class of symbol as variable" );
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}
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}
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| constant { $$ = $1; }
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| RTA '.' FROM { $$ = f_new_inst(); $$->code = 'a'; $$->a1.i = T_IP; $$->a2.i = OFFSETOF(struct rta, from); }
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| RTA '.' GW { $$ = f_new_inst(); $$->code = 'a'; $$->a1.i = T_IP; $$->a2.i = OFFSETOF(struct rta, gw); }
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| RTA '.' NET { $$ = f_new_inst(); $$->code = 'a'; $$->a1.i = T_PREFIX; $$->a2.i = 0x12345678; }
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| term '.' IP { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->a2.i = T_IP; }
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| term '.' LEN { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->a2.i = T_INT; }
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;
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break_command:
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QUITBIRD { $$ = F_QUITBIRD }
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| ACCEPT { $$ = F_ACCEPT }
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| REJECT { $$ = F_REJECT }
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| ERROR { $$ = F_ERROR }
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| PRINT { $$ = F_NOP }
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;
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ifthen:
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IF term THEN block {
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$$ = f_new_inst();
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$$->code = '?';
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$$->a1.p = $2;
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$$->a2.p = $4;
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}
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;
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print_one:
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term { $$ = f_new_inst(); $$->code = 'p'; $$->a1.p = $1; $$->a2.p = NULL; }
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;
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print_list: /* EMPTY */ { $$ = NULL; }
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| print_one print_list {
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if ($1) {
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$1->next = $2;
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$$ = $1;
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} else $$ = $2;
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}
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;
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cmd:
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ifthen {
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$$ = $1;
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}
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/* FIXME: this leads to shift/reduce conflict. */
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| ifthen ELSE block {
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$$ = f_new_inst();
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$$->code = '?';
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$$->a1.p = $1;
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$$->a2.p = $3;
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}
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| SYM '=' term ';' {
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$$ = f_new_inst();
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printf( "Ook, we'll set value\n" );
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if (($1->class & ~T_MASK) != SYM_VARIABLE)
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cf_error( "You may only set variables, and this is %x.\n", $1->class );
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$$->code = 's';
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$$->a1.p = $1;
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$$->a2.p = $3;
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}
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| break_command print_list ';' { $$ = f_new_inst(); $$->code = 'p,'; $$->a1.p = $2; $$->a2.i = $1; }
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;
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CF_END
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