170 lines
3.6 KiB
C
170 lines
3.6 KiB
C
/*
|
|
* Filters: utility functions
|
|
*
|
|
* Copyright 1998 Pavel Machek <pavel@ucw.cz>
|
|
*
|
|
* Can be freely distributed and used under the terms of the GNU GPL.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <sys/signal.h>
|
|
#include <setjmp.h>
|
|
|
|
#include "nest/bird.h"
|
|
#include "lib/lists.h"
|
|
#include "lib/resource.h"
|
|
#include "lib/socket.h"
|
|
#include "nest/route.h"
|
|
#include "nest/protocol.h"
|
|
#include "nest/iface.h"
|
|
#include "conf/conf.h"
|
|
#include "filter/filter.h"
|
|
|
|
struct f_inst *startup_func = NULL;
|
|
|
|
#define runtime(x) do { \
|
|
log( L_ERR, x ); \
|
|
res.type = T_RETURN; \
|
|
res.val.i = F_ERROR; \
|
|
return res; \
|
|
} while(0)
|
|
|
|
#define ARG(x,y) \
|
|
x = interpret(what->y); \
|
|
if (x.type == T_RETURN) \
|
|
return x;
|
|
|
|
#define ONEARG ARG(v1, arg1)
|
|
#define TWOARGS ARG(v1, arg1) \
|
|
ARG(v2, arg2)
|
|
|
|
static struct f_val
|
|
interpret(struct f_inst *what)
|
|
{
|
|
struct symbol *sym;
|
|
struct f_val v1, v2, res;
|
|
|
|
res.type = T_VOID;
|
|
if (!what)
|
|
return res;
|
|
|
|
switch(what->code) {
|
|
case ',':
|
|
TWOARGS;
|
|
break;
|
|
case '+':
|
|
TWOARGS;
|
|
if (v1.type != v2.type)
|
|
runtime( "Can not operate with values of incompatible types" );
|
|
|
|
switch (res.type = v1.type) {
|
|
case T_VOID: runtime( "Can not operate with values of type void" );
|
|
case T_INT: res.val.i = v1.val.i + v2.val.i; break;
|
|
default: runtime( "Usage of unknown type" );
|
|
}
|
|
break;
|
|
case '=':
|
|
ARG(v2, arg2);
|
|
sym = what->arg1;
|
|
switch (res.type = v2.type) {
|
|
case T_VOID: runtime( "Can not assign void values" );
|
|
case T_INT:
|
|
if (sym->class != (SYM_VARIABLE | T_INT))
|
|
runtime( "Variable of bad type" );
|
|
sym->aux = v2.val.i;
|
|
break;
|
|
}
|
|
break;
|
|
case 'c':
|
|
res.type = T_INT;
|
|
res.val.i = (int) what->arg1;
|
|
break;
|
|
case 'i':
|
|
res.type = T_INT;
|
|
res.val.i = * ((int *) what->arg1);
|
|
break;
|
|
case 'p':
|
|
ONEARG;
|
|
printf( "Printing: " );
|
|
switch (v1.type) {
|
|
case T_VOID: printf( "(void)" ); break;
|
|
case T_INT: printf( "%d", v1.val.i ); break;
|
|
default: runtime( "Print of variable of unknown type" );
|
|
}
|
|
printf( "\n" );
|
|
break;
|
|
case '?':
|
|
ONEARG;
|
|
if (v1.type != T_INT)
|
|
runtime( "If requires integer expression" );
|
|
if (v1.val.i) {
|
|
ARG(res,arg2);
|
|
}
|
|
break;
|
|
case 'D':
|
|
printf( "DEBUGGING PRINT\n" );
|
|
break;
|
|
case '0':
|
|
printf( "No operation\n" );
|
|
break;
|
|
case 'd':
|
|
printf( "Puts: %s\n", (char *) what->arg1 );
|
|
break;
|
|
case '!':
|
|
switch ((int) what->arg1) {
|
|
case F_QUITBIRD:
|
|
die( "Filter asked me to die" );
|
|
case F_ACCEPT:
|
|
/* Should take care about turning ACCEPT into MODIFY */
|
|
case F_ERROR:
|
|
case F_REJECT:
|
|
res.type = T_RETURN;
|
|
res.val.i = (int) what->arg1;
|
|
break;
|
|
default:
|
|
bug( "unknown return type: can not happen");
|
|
}
|
|
break;
|
|
default:
|
|
bug( "Unknown instruction %d (%c)", what->code, what->code & 0xff);
|
|
}
|
|
if (what->next)
|
|
return interpret(what->next);
|
|
return res;
|
|
}
|
|
|
|
struct f_inst *
|
|
f_new_inst(void)
|
|
{
|
|
struct f_inst * ret;
|
|
ret = cfg_alloc(sizeof(struct f_inst));
|
|
ret->code = 0;
|
|
ret->arg1 = ret->arg2 = ret->next = NULL;
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
f_run(struct filter *filter, struct rte *rtein, struct rte **rteout)
|
|
{
|
|
struct f_inst *inst;
|
|
struct f_val res;
|
|
debug( "Running filter `%s'...", filter->name );
|
|
|
|
inst = filter->root;
|
|
res = interpret(inst);
|
|
if (res.type != T_RETURN)
|
|
return F_ERROR;
|
|
debug( "done (%d)\n", res.val.i );
|
|
return res.val.i;
|
|
}
|
|
|
|
void
|
|
filters_postconfig(void)
|
|
{
|
|
printf( "Launching startup function..." );
|
|
if (startup_func)
|
|
interpret(startup_func);
|
|
printf( "done\n" );
|
|
}
|