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