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c215a4bc IJ |
1 | /* |
2 | * This file is part of secnet. | |
3 | * See README for full list of copyright holders. | |
4 | * | |
5 | * secnet is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by | |
9c6a8729 | 7 | * the Free Software Foundation; either version 3 of the License, or |
c215a4bc IJ |
8 | * (at your option) any later version. |
9 | * | |
10 | * secnet is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * version 3 along with secnet; if not, see | |
17 | * https://www.gnu.org/licenses/gpl.html. | |
18 | */ | |
19 | ||
8689b3a9 | 20 | #include "secnet.h" |
2fe58dfd SE |
21 | #include <stdio.h> |
22 | #include <fcntl.h> | |
23 | #include <string.h> | |
2fe58dfd SE |
24 | #include <sys/stat.h> |
25 | #include <unistd.h> | |
4f5e39ec | 26 | #include <assert.h> |
2fe58dfd | 27 | |
2fe58dfd SE |
28 | struct rgen_data { |
29 | closure_t cl; | |
30 | struct random_if ops; | |
31 | struct cloc loc; | |
32 | int fd; | |
33 | }; | |
34 | ||
35 | static random_fn random_generate; | |
e3f13757 | 36 | static void random_generate(void *data, int32_t bytes, uint8_t *buff) |
2fe58dfd SE |
37 | { |
38 | struct rgen_data *st=data; | |
4f5e39ec | 39 | int r; |
2fe58dfd | 40 | |
4f5e39ec SE |
41 | r= read(st->fd,buff,bytes); |
42 | ||
43 | assert(r == bytes); | |
e3f13757 IJ |
44 | /* This is totally crap error checking, but callers of |
45 | * this function do not check the return value and dealing | |
46 | * with failure of this everywhere would be very inconvenient. | |
4f5e39ec | 47 | */ |
2fe58dfd SE |
48 | } |
49 | ||
50 | static list_t *random_apply(closure_t *self, struct cloc loc, | |
51 | dict_t *context, list_t *args) | |
52 | { | |
53 | struct rgen_data *st; | |
54 | item_t *arg1, *arg2; | |
55 | string_t filename=NULL; | |
56 | ||
b7886fd4 | 57 | NEW(st); |
2fe58dfd SE |
58 | |
59 | st->cl.description="randomsource"; | |
60 | st->cl.type=CL_RANDOMSRC; | |
61 | st->cl.apply=NULL; | |
62 | st->cl.interface=&st->ops; | |
63 | st->ops.st=st; | |
64 | st->ops.blocking=False; | |
65 | st->ops.generate=random_generate; | |
66 | st->loc=loc; | |
67 | ||
68 | arg1=list_elem(args,0); | |
69 | arg2=list_elem(args,1); | |
70 | ||
71 | if (!arg1) { | |
4f5e39ec | 72 | cfgfatal(loc,"randomsource","requires a filename\n"); |
2fe58dfd SE |
73 | } |
74 | if (arg1->type != t_string) { | |
75 | cfgfatal(arg1->loc,"randomsource", | |
76 | "filename (arg1) must be a string\n"); | |
77 | } | |
78 | filename=arg1->data.string; | |
79 | ||
80 | if (arg2) { | |
81 | if (arg2->type != t_bool) { | |
82 | cfgfatal(arg2->loc,"randomsource", | |
83 | "blocking parameter (arg2) must be bool\n"); | |
84 | } | |
85 | st->ops.blocking=arg2->data.bool; | |
86 | } | |
87 | ||
88 | if (!filename) { | |
4f5e39ec | 89 | cfgfatal(loc,"randomsource","requires a filename\n"); |
2fe58dfd SE |
90 | } |
91 | st->fd=open(filename,O_RDONLY); | |
92 | if (st->fd<0) { | |
93 | fatal_perror("randomsource (%s:%d): cannot open %s",arg1->loc.file, | |
94 | arg1->loc.line,filename); | |
95 | } | |
96 | return new_closure(&st->cl); | |
97 | } | |
98 | ||
99 | void random_module(dict_t *d) | |
100 | { | |
101 | add_closure(d,"randomfile",random_apply); | |
102 | } |