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920be817aa
CASPER_SERVICE_STDIO - Casper will not close the first three descriptors (stdin, stdout and stderr) this can be helpful for debugging. CASPER_SERVICE_FD - Capser will not close all other descriptors, this can be useful for a filesystem service.
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/*-
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/nv.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libcasper.h>
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#include <libcasper_service.h>
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#include "cap_random.h"
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#define MAXSIZE (1024 * 1024)
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int
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cap_random_buf(cap_channel_t *chan, void *buf, size_t nbytes)
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{
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nvlist_t *nvl;
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const void *randbuf;
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uint8_t *ptr;
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size_t left, randbufsize;
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left = nbytes;
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ptr = buf;
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while (left > 0) {
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "generate");
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nvlist_add_number(nvl, "size",
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(uint64_t)(left > MAXSIZE ? MAXSIZE : left));
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nvl = cap_xfer_nvlist(chan, nvl, 0);
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if (nvl == NULL)
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return (-1);
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if (nvlist_get_number(nvl, "error") != 0) {
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errno = (int)nvlist_get_number(nvl, "error");
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nvlist_destroy(nvl);
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return (-1);
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}
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randbuf = nvlist_get_binary(nvl, "data", &randbufsize);
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memcpy(ptr, randbuf, randbufsize);
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nvlist_destroy(nvl);
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ptr += randbufsize;
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assert(left >= randbufsize);
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left -= randbufsize;
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}
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return (0);
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}
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/*
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* Service functions.
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*/
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static int
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random_command(const char *cmd, const nvlist_t *limits __unused,
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nvlist_t *nvlin, nvlist_t *nvlout)
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{
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void *data;
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size_t size;
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if (strcmp(cmd, "generate") != 0)
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return (EINVAL);
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if (!nvlist_exists_number(nvlin, "size"))
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return (EINVAL);
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size = (size_t)nvlist_get_number(nvlin, "size");
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if (size == 0 || size > MAXSIZE)
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return (EINVAL);
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data = malloc(size);
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if (data == NULL)
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return (ENOMEM);
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arc4random_buf(data, size);
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nvlist_move_binary(nvlout, "data", data, size);
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return (0);
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}
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CREATE_SERVICE("system.random", NULL, random_command, 0);
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