mdw@git.distorted.org.uk Git - secnet/blob - random.c

   1 /* $Log$
   2  */
   3
   4 #include <stdio.h>
   5 #include <fcntl.h>
   6 #include <string.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <unistd.h>
  10
  11 #include "secnet.h"
  12
  13 struct rgen_data {
  14     closure_t cl;
  15     struct random_if ops;
  16     struct cloc loc;
  17     int fd;
  18 };
  19
  20 static random_fn random_generate;
  21 static bool_t random_generate(void *data, uint32_t bytes, uint8_t *buff)
  22 {
  23     struct rgen_data *st=data;
  24
  25     /* XXX XXX error checking */
  26     read(st->fd,buff,bytes);
  27
  28     return True;
  29 }
  30
  31 static list_t *random_apply(closure_t *self, struct cloc loc,
  32                             dict_t *context, list_t *args)
  33 {
  34     struct rgen_data *st;
  35     item_t *arg1, *arg2;
  36     string_t filename=NULL;
  37
  38     st=safe_malloc(sizeof(*st),"random_apply");
  39
  40     st->cl.description="randomsource";
  41     st->cl.type=CL_RANDOMSRC;
  42     st->cl.apply=NULL;
  43     st->cl.interface=&st->ops;
  44     st->ops.st=st;
  45     st->ops.blocking=False;
  46     st->ops.generate=random_generate;
  47     st->loc=loc;
  48
  49     arg1=list_elem(args,0);
  50     arg2=list_elem(args,1);
  51
  52     if (!arg1) {
  53         fatal("randomsource: requires a filename\n");
  54     }
  55     if (arg1->type != t_string) {
  56         cfgfatal(arg1->loc,"randomsource",
  57                  "filename (arg1) must be a string\n");
  58     }
  59     filename=arg1->data.string;
  60
  61     if (arg2) {
  62         if (arg2->type != t_bool) {
  63             cfgfatal(arg2->loc,"randomsource",
  64                      "blocking parameter (arg2) must be bool\n");
  65         }
  66         st->ops.blocking=arg2->data.bool;
  67     }
  68
  69     if (!filename) {
  70         fatal("randomsource requires a filename");
  71     }
  72     st->fd=open(filename,O_RDONLY);
  73     if (st->fd<0) {
  74         fatal_perror("randomsource (%s:%d): cannot open %s",arg1->loc.file,
  75                      arg1->loc.line,filename);
  76     }
  77     return new_closure(&st->cl);
  78 }
  79
  80 void random_module(dict_t *d)
  81 {
  82     add_closure(d,"randomfile",random_apply);
  83 }