filter/f-util.c

   1 /*
   2  *      Filters: utility functions
   3  *
   4  *      Copyright 1998 Pavel Machek <pavel@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #include <stdio.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <sys/signal.h>
  13
  14 #include "nest/bird.h"
  15 #include "lib/lists.h"
  16 #include "lib/resource.h"
  17 #include "lib/socket.h"
  18 #include "nest/route.h"
  19 #include "nest/protocol.h"
  20 #include "nest/iface.h"
  21 #include "conf/conf.h"
  22 #include "filter/filter.h"
  23
  24 struct f_instruction *last_func = NULL;
  25
  26 static void
  27 interpret(struct f_instruction *what)
  28 {
  29   struct symbol *sym;
  30   if (!what)
  31     return;
  32   switch(what->code) {
  33   case ',':
  34     interpret(what->arg1);
  35     interpret(what->arg2);
  36     break;
  37   case '=':
  38     sym = what->arg1;
  39     sym->aux = (int) what->arg2;
  40     break;
  41   case 'p':
  42     sym = what->arg1;
  43     switch(sym->class) {
  44     case SYM_VARIABLE_INT:
  45       printf( "Printing: %d\n", sym->aux );
  46       break;
  47     default:
  48       printf( "Unknown type passed to print\n" );
  49       break;
  50     }
  51     break;
  52   case 'D':
  53     printf( "DEBUGGING PRINT\n" );
  54     break;
  55   case '0':
  56     printf( "No operation\n" );
  57     break;
  58   }
  59   interpret(what->next);
  60 }
  61
  62 void
  63 filters_postconfig(void)
  64 {
  65   if (!last_func)
  66     printf( "No function defined\n" );
  67   else {
  68     interpret(last_func);
  69   }
  70 }
  71
  72 struct f_instruction *
  73 f_new_inst(void)
  74 {
  75   struct f_instruction * ret;
  76   ret = cfg_alloc(sizeof(struct f_instruction));
  77   ret->code = 0;
  78   ret->arg1 = ret->arg2 = ret->next = NULL;
  79   return ret;
  80 }
  81
  82 int
  83 f_run(struct symbol *filter, struct rte *rtein, struct rte **rteout)
  84 {
  85   struct f_instruction *inst;
  86   debug( "Running filter `%s'...", filter->name );
  87
  88   inst = filter->def;
  89   interpret(inst);
  90   debug( "done\n" );
  91   return F_ACCEPT;
  92 }