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

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