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Filters: permit variables of prefix types, cleanup around

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variables. TODO list added, hopefully complete. Use new features of
filters in bird.conf
This commit is contained in:
Pavel Machek 1999-10-12 06:27:42 +00:00
parent c79ec2ec19
commit d3dd620b96
4 changed files with 110 additions and 60 deletions
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41
bird.conf
View file

@ -13,7 +13,7 @@ function callme (int arg1; int arg2;)
print "Function callme called arguments " arg1 " and " arg2; print "Function callme called arguments " arg1 " and " arg2;
case arg1 { case arg1 {
2: { print "dva"; print "jeste jednou dva"; } 2: print "dva"; print "jeste jednou dva";
[ 3 .. 5 ]: print "tri az pet"; [ 3 .. 5 ]: print "tri az pet";
else: print "neco jineho"; else: print "neco jineho";
} }
@ -22,37 +22,30 @@ function callme (int arg1; int arg2;)
function startup () function startup ()
int i; int i;
prefix px; prefix px;
{ {
print "Bird filter language: selftesting..."; print "Testing filter language:";
i = 4; i = 4;
i = 1230 + i; i = 1230 + i;
print "Testing arithmetics: 1234 = " i; print " arithmetics: 1234 = " i;
if i = 4 then { print "*** FAIL: if 0"; quitbird; } else print "test 1 passed"; printn " if statements ";
if 1234 = i then print "test 2 passed"; else { print "*** FAIL: if 1 else"; } if i = 4 then { print "*** FAIL: if 0"; quitbird; } else printn ".";
if 1 <= 1 then print "test 3 passed"; else { print "*** FAIL: test 3"; } if 1234 = i then printn "."; else { print "*** FAIL: if 1 else"; }
if 1234 < 1234 then { print "*** FAIL: test 4"; quitbird; } else print "test 4 passed"; if 1 <= 1 then printn "."; else { print "*** FAIL: test 3"; }
if 1234 < 1234 then { print "*** FAIL: test 4"; quitbird; } else print "ok";
print "Testing IP addresses: 1.2.3.4 = " 1.2.3.4; print " data types; must be true: " 1.2.3.4 = 1.2.3.4 "," 1 ~ [1,2,3] "," 5 ~ [1..20] "," 2 ~ [ 1, 2, 3 ] "," 5 ~ [ 4 .. 7 ] "," 1.2.3.4 ~ [ 1.2.3.3..1.2.3.5 ];
print "Testing sets of ints = " [ 1, 2, 3 ]; print " data types: must be false: " 1 ~ [ 2, 3, 4 ] "," 5 ~ [ 2, 3, 4, 7..11 ] "," 1.2.3.4 ~ [ 1.2.3.3, 1.2.3.5 ] "," (1,2) > (2,2) "," (1,1) > (1,1);
print "Testing sets of ints = " [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 ];
print "Testing sets of IPs = " [ 1.2.3.4, 2.3.4.5, 3.4.5.6 ];
print "Sets: true = " 1 ~ [ 1, 2, 3 ];
print " false = " 1 ~ [ 2, 3, 4 ];
print "a..b: true = " 5 ~ [ 4 .. 7 ];
print " false = " 5 ~ [ 2, 3, 4, 7..11 ];
print "IPsets: true = " 1.2.3.4 ~ [ 1.2.3.3..1.2.3.5 ];
print " false = " 1.2.3.4 ~ [ 1.2.3.3, 1.2.3.5 ];
print "Testing prefixes: 1.2.3.4/18 = " 1.2.3.4/18; px = 1.2.3.4/18;
print "Testing prefixes: 1.2.3.4/18 = " px;
print "Testing pairs: (1,2) = " (1,2); print "Testing pairs: (1,2) = " (1,2);
print "Testing functions..."; print "Testing functions...";
callme ( 1, 2, ); callme ( 1, 2 );
callme ( 2, 2, ); callme ( 2, 2 );
callme ( 3, 2, ); callme ( 3, 2 );
callme ( 4, 2, ); callme ( 4, 2 );
callme ( 7, 2, ); callme ( 7, 2 );
print "done"; print "done";
quitbird; quitbird;

83
filter/config.Y
View file

@ -5,16 +5,13 @@
* *
* Can be freely distributed and used under the terms of the GNU GPL. * Can be freely distributed and used under the terms of the GNU GPL.
* *
FIXME: prefix variables, make prefix.ip and prefix.length work
FIXME: define keyword FIXME: define keyword
FIXME: case without { }'s FIXME: make px+, px- px^pair work in prefix sets
FIXME: allow px+, px- px^pair in prefix sets
FIXME: create ip.mask(x) function FIXME: create ip.mask(x) function
FIXME: whole system of paths, path ~ string, path.prepend(), path.originate FIXME: whole system of paths, path ~ string, path.prepend(), path.originate
FIXME: create community lists FIXME: create community lists
FIXME: access to dynamic attributes FIXME: access to dynamic attributes
FIXME: do not allow function call by callme(1,2,) FIXME: make case faster
FIXME: pairs of integers: define compare
*/ */
CF_HDR CF_HDR
@ -29,12 +26,12 @@ CF_HDR
CF_DECLS CF_DECLS
CF_KEYWORDS(FUNCTION, PRINT, CONST, CF_KEYWORDS(FUNCTION, PRINT, PRINTN, CONST,
ACCEPT, REJECT, ERROR, QUITBIRD, ACCEPT, REJECT, ERROR, QUITBIRD,
INT, BOOL, IP, PREFIX, PAIR, SET, STRING, INT, BOOL, IP, PREFIX, PAIR, SET, STRING,
IF, THEN, ELSE, CASE, IF, THEN, ELSE, CASE,
TRUE, FALSE, TRUE, FALSE,
RTA, FROM, GW, NET, RTA, FROM, GW, NET, MASK,
LEN, LEN,
IMPOSSIBLE, IMPOSSIBLE,
FILTER FILTER
@ -42,9 +39,9 @@ CF_KEYWORDS(FUNCTION, PRINT, CONST,
%type <x> term block cmds cmd function_body ifthen constant print_one print_list var_list switch_body %type <x> term block cmds cmd function_body ifthen constant print_one print_list var_list switch_body
%type <f> filter filter_body %type <f> filter filter_body
%type <i> type break_command %type <i> type break_command pair
%type <e> set_item set_items %type <e> set_item set_items
%type <v> set_atom %type <v> set_atom prefix prefix_s ipa
%type <s> decls function_params %type <s> decls function_params
CF_GRAMMAR CF_GRAMMAR
@ -80,6 +77,12 @@ decls: /* EMPTY */ { $$ = NULL; }
cf_define_symbol($2, SYM_VARIABLE | $1, NULL); cf_define_symbol($2, SYM_VARIABLE | $1, NULL);
printf( "New variable %s type %x\n", $2->name, $1 ); printf( "New variable %s type %x\n", $2->name, $1 );
$2->aux = $4; $2->aux = $4;
{
struct f_val * val;
val = cfg_alloc(sizeof(struct f_val));
val->type = $1;
$2->aux2 = val;
}
$$=$2; $$=$2;
} }
; ;
@ -146,10 +149,36 @@ block:
} }
; ;
/*
* Simple types, their bison value is int
*/
pair:
'(' NUM ',' NUM ')' { $$ = $2 << 16 | $4; }
;
/*
* Complex types, their bison value is struct f_val
*/
prefix_s:
IPA '/' NUM { $$.type = T_PREFIX; $$.val.px.ip = $1; $$.val.px.len = $3; printf( "ook, we have prefix here\n" ); }
;
prefix:
prefix_s { $$ = $1; }
| prefix_s '+' { $$ = $1; $$.val.px.len |= LEN_PLUS; }
| prefix_s '-' { $$ = $1; $$.val.px.len |= LEN_MINUS; }
/* | prefix_s '{' NUM ',' NUM '}' How should this be done? */
;
ipa:
IPA { $$.type = T_IP; $$.val.ip = $1; }
;
set_atom: set_atom:
NUM { $$.type = T_INT; $$.val.i = $1; } NUM { $$.type = T_INT; $$.val.i = $1; }
| IPA { $$.type = T_IP; $$.val.ip = $1; } | pair { $$.type = T_PAIR; $$.val.i = $1; }
| ipa { $$ = $1; }
| prefix { $$ = $1; }
; ;
set_item: set_item:
@ -162,15 +191,16 @@ set_items:
| set_items ',' set_item { $$ = $3; $$->left = $1; } | set_items ',' set_item { $$ = $3; $$->left = $1; }
; ;
constant: constant:
CONST '(' expr ')' { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_INT; $$->a2.i = $3; } CONST '(' expr ')' { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_INT; $$->a2.i = $3; }
| NUM { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_INT; $$->a2.i = $1; } | NUM { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_INT; $$->a2.i = $1; }
| TRUE { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_BOOL; $$->a2.i = 1; } | TRUE { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_BOOL; $$->a2.i = 1; }
| FALSE { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_BOOL; $$->a2.i = 0; } | FALSE { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_BOOL; $$->a2.i = 0; }
| TEXT { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_STRING; $$->a2.p = $1; } | TEXT { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_STRING; $$->a2.p = $1; }
| '(' NUM ',' NUM ')' { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_PAIR; $$->a2.i = $2 << 16 | $4; } | pair { $$ = f_new_inst(); $$->code = 'c'; $$->a1.i = T_PAIR; $$->a2.i = $1; }
| IPA { struct f_val * val; val = cfg_alloc(sizeof(struct f_val)); $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; val->type = T_IP; val->val.ip = $1; } | ipa { NEW_F_VAL; $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; *val = $1; }
| IPA '/' NUM { struct f_val * val; val = cfg_alloc(sizeof(struct f_val)); $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; val->type = T_PREFIX; val->val.px.ip = $1; val->val.px.len = $3; printf( "ook, we have prefix here\n" ); } | prefix_s {NEW_F_VAL; $$ = f_new_inst(); $$->code = 'C'; $$->a1.p = val; *val = $1; }
| '[' 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" ); } | '[' 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" ); }
; ;
@ -188,9 +218,11 @@ term:
$$ = f_new_inst(); $$ = f_new_inst();
switch ($1->class) { switch ($1->class) {
case SYM_VARIABLE | T_INT: case SYM_VARIABLE | T_INT:
$$->code = 'i'; case SYM_VARIABLE | T_PAIR:
$$->a1.i = T_INT; case SYM_VARIABLE | T_PREFIX:
$$->a2.p = &($1->aux); case SYM_VARIABLE | T_IP:
$$->code = 'C';
$$->a1.p = $1->aux2;
break; break;
default: default:
cf_error("Can not use this class of symbol as variable." ); cf_error("Can not use this class of symbol as variable." );
@ -204,6 +236,7 @@ term:
| term '.' IP { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->a2.i = T_IP; } | term '.' IP { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->a2.i = T_IP; }
| term '.' LEN { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->a2.i = T_INT; } | term '.' LEN { $$ = f_new_inst(); $$->code = 'cp'; $$->a1.p = $1; $$->a2.i = T_INT; }
| term '.' MASK '(' term ')' { $$ = f_new_inst(); $$->code = 'iM'; $$->a1.p = $1; $$->a2.p = $5; }
; ;
break_command: break_command:
@ -212,6 +245,7 @@ break_command:
| REJECT { $$ = F_REJECT } | REJECT { $$ = F_REJECT }
| ERROR { $$ = F_ERROR } | ERROR { $$ = F_ERROR }
| PRINT { $$ = F_NOP } | PRINT { $$ = F_NOP }
| PRINTN { $$ = F_NONL }
; ;
ifthen: ifthen:
@ -236,7 +270,13 @@ print_list: /* EMPTY */ { $$ = NULL; }
} }
; ;
var_list: /* EMPTY */ { $$ = NULL; } var_list: term {
$$ = f_new_inst();
$$->code = 's';
$$->a1.p = NULL;
$$->a2.p = $1;
$$->next = NULL;
}
| term ',' var_list { | term ',' var_list {
$$ = f_new_inst(); $$ = f_new_inst();
$$->code = 's'; $$->code = 's';
@ -246,15 +286,16 @@ var_list: /* EMPTY */ { $$ = NULL; }
} }
; ;
/* 2 shift/reduce conflicts here. Curable by replacing cmds with block which breaks syntax */
switch_body: /* EMPTY */ { $$ = NULL; } switch_body: /* EMPTY */ { $$ = NULL; }
| term ':' block switch_body { | term ':' cmds switch_body {
$$ = f_new_inst(); $$ = f_new_inst();
$$->code = 'of'; $$->code = 'of';
$$->a1.p = $1; $$->a1.p = $1;
$$->a2.p = $3; $$->a2.p = $3;
$$->next = $4; $$->next = $4;
} }
| ELSE ':' block { | ELSE ':' cmds {
$$ = f_new_inst(); $$ = f_new_inst();
$$->code = 'el'; $$->code = 'el';
$$->a1.p = NULL; $$->a1.p = NULL;

28
filter/filter.c
View file

@ -58,6 +58,7 @@ val_compare(struct f_val v1, struct f_val v2)
return CMP_ERROR; return CMP_ERROR;
switch (v1.type) { switch (v1.type) {
case T_INT: case T_INT:
case T_PAIR:
if (v1.val.i == v2.val.i) return 0; if (v1.val.i == v2.val.i) return 0;
if (v1.val.i < v2.val.i) return -1; if (v1.val.i < v2.val.i) return -1;
return 1; return 1;
@ -209,31 +210,32 @@ interpret(struct f_inst *what)
runtime( "~ applied on unknown type pair" ); runtime( "~ applied on unknown type pair" );
break; break;
/* Set to consant, a1 = type, a2 = value */ /* Set to indirect value, a1 = variable, a2 = value */
case 's': case 's':
ARG(v2, a2.p); ARG(v2, a2.p);
sym = what->a1.p; sym = what->a1.p;
switch (res.type = v2.type) { switch (res.type = v2.type) {
case T_VOID: runtime( "Can not assign void values" ); case T_VOID: runtime( "Can not assign void values" );
case T_INT: case T_INT:
if (sym->class != (SYM_VARIABLE | T_INT)) case T_IP:
case T_PREFIX:
case T_PAIR:
if (sym->class != (SYM_VARIABLE | v2.type))
runtime( "Variable of bad type" ); runtime( "Variable of bad type" );
sym->aux = v2.val.i; * (struct f_val *) sym->aux2 = v2;
break; break;
default:
bug( "Set to invalid type\n" );
} }
break; break;
case 'c': case 'c': /* integer (or simple type) constant */
res.type = what->a1.i; res.type = what->a1.i;
res.val.i = (int) what->a2.p; res.val.i = what->a2.i;
break; break;
case 'C': case 'C':
res = * ((struct f_val *) what->a1.p); res = * ((struct f_val *) what->a1.p);
break; break;
case 'i':
res.type = what->a1.i;
res.val.i = * ((int *) what->a2.p);
break;
case 'p': case 'p':
ONEARG; ONEARG;
val_print(v1); val_print(v1);
@ -253,7 +255,8 @@ interpret(struct f_inst *what)
break; break;
case 'p,': case 'p,':
ONEARG; ONEARG;
printf( "\n" ); if (what->a2.i != F_NONL)
printf( "\n" );
switch (what->a2.i) { switch (what->a2.i) {
case F_QUITBIRD: case F_QUITBIRD:
@ -265,6 +268,7 @@ interpret(struct f_inst *what)
res.type = T_RETURN; res.type = T_RETURN;
res.val.i = what->a1.i; res.val.i = what->a1.i;
break; break;
case F_NONL:
case F_NOP: case F_NOP:
break; break;
default: default:
@ -309,6 +313,10 @@ interpret(struct f_inst *what)
ONEARG; ONEARG;
interpret_switch(what->a2.p, v1); interpret_switch(what->a2.p, v1);
break; break;
case 'iM': /* IP.MASK(val) */
TWOARGS_C;
bug( "Should implement ip.mask\n" );
break;
default: default:
bug( "Unknown instruction %d (%c)", what->code, what->code & 0xff); bug( "Unknown instruction %d (%c)", what->code, what->code & 0xff);
} }

18
filter/filter.h
View file

@ -31,6 +31,11 @@ struct f_inst { /* Instruction */
struct prefix { struct prefix {
ip_addr ip; ip_addr ip;
int len; int len;
#define LEN_MASK 0xff
#define LEN_PLUS 0x10000
#define LEN_MINUS 0x20000
#define LEN_RANGE 0x40000
/* If range then prefix must be in range (len >> 8 & 0xff, len & 0xff) */
}; };
struct f_val { struct f_val {
@ -66,11 +71,12 @@ int val_compare(struct f_val v1, struct f_val v2);
void val_print(struct f_val v); void val_print(struct f_val v);
#define F_NOP 0 #define F_NOP 0
#define F_ACCEPT 1 /* Need to preserve ordering: accepts < rejects! */ #define F_NONL 1
#define F_MODIFY 2 /* FIXME: Introduce modification flags instead? */ #define F_ACCEPT 2 /* Need to preserve ordering: accepts < rejects! */
#define F_REJECT 3 #define F_MODIFY 3 /* FIXME: Introduce modification flags instead? */
#define F_ERROR 4 #define F_REJECT 4
#define F_QUITBIRD 5 #define F_ERROR 5
#define F_QUITBIRD 6
#define FILTER_ACCEPT NULL #define FILTER_ACCEPT NULL
#define FILTER_REJECT ((void *) 1) #define FILTER_REJECT ((void *) 1)
@ -101,4 +107,6 @@ struct f_tree {
void *data; void *data;
}; };
#define NEW_F_VAL struct f_val * val; val = cfg_alloc(sizeof(struct f_val));
#endif #endif