Pointer subtraction to find size only works with char pointers. Noticed by: jhb@ Sponsored by: Netflix, Inc
181 lines
4.4 KiB
C
181 lines
4.4 KiB
C
/*-
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* Copyright (c) 2017 Netflix, Inc.
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* All rights reserved.
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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 AUTHOR 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 AUTHOR 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 <ctype.h>
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#include <efivar.h>
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#include <efivar-dp.h>
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#include <err.h>
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#include <errno.h>
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#include <getopt.h>
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#include <stddef.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 <unistd.h>
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#include "efiutil.h"
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#include "efichar.h"
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#include <efivar-dp.h>
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/*
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* Dump the data as ASCII data, which is a pretty
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* printed form
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*/
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void
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asciidump(uint8_t *data, size_t datalen)
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{
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size_t i;
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int len;
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len = 0;
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for (i = 0; i < datalen; i++) {
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if (isprint(data[i])) {
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len++;
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if (len > 80) {
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len = 0;
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printf("\n");
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}
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printf("%c", data[i]);
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} else {
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len +=3;
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if (len > 80) {
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len = 0;
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printf("\n");
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}
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printf("%%%02x", data[i]);
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}
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}
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printf("\n");
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}
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void
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utf8dump(uint8_t *data, size_t datalen)
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{
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char *utf8 = NULL;
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efi_char *ucs2;
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/*
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* NUL terminate the string. Not all strings need it, but some
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* do and an extra NUL won't change what's printed.
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*/
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ucs2 = malloc(datalen + sizeof(efi_char));
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memcpy(ucs2, data, datalen);
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ucs2[datalen / sizeof(efi_char)] = 0;
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ucs2_to_utf8(ucs2, &utf8);
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printf("%s\n", utf8);
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free(utf8);
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free(ucs2);
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}
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void
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hexdump(uint8_t *data, size_t datalen)
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{
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size_t i;
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for (i = 0; i < datalen; i++) {
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if (i % 16 == 0) {
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if (i != 0)
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printf("\n");
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printf("%04x: ", (int)i);
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}
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printf("%02x ", data[i]);
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}
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printf("\n");
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}
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void
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bindump(uint8_t *data, size_t datalen)
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{
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write(1, data, datalen);
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}
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#define LOAD_OPTION_ACTIVE 1
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#define SIZE(dp, edp) (size_t)((intptr_t)(void *)edp - (intptr_t)(void *)dp)
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void
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efi_print_load_option(uint8_t *data, size_t datalen, int Aflag, int bflag, int uflag)
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{
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uint8_t *ep = data + datalen;
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uint8_t *walker = data;
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uint32_t attr;
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uint16_t fplen;
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efi_char *descr;
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efidp dp, edp;
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char *str = NULL;
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char buf[1024];
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int len;
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void *opt;
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int optlen;
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if (datalen < sizeof(attr) + sizeof(fplen) + sizeof(efi_char))
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return;
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// First 4 bytes are attribute flags
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attr = le32dec(walker);
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walker += sizeof(attr);
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// Next two bytes are length of the file paths
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fplen = le16dec(walker);
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walker += sizeof(fplen);
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// Next we have a 0 terminated UCS2 string that we know to be aligned
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descr = (efi_char *)(intptr_t)(void *)walker;
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len = ucs2len(descr); // XXX need to sanity check that len < (datalen - (ep - walker) / 2)
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walker += (len + 1) * sizeof(efi_char);
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if (walker > ep)
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return;
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// Now we have fplen bytes worth of file path stuff
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dp = (efidp)walker;
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walker += fplen;
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if (walker > ep)
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return;
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edp = (efidp)walker;
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// Everything left is the binary option args
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opt = walker;
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optlen = ep - walker;
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// We got to here, everything is good
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printf("%c ", attr & LOAD_OPTION_ACTIVE ? '*' : ' ');
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ucs2_to_utf8(descr, &str);
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printf("%s", str);
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free(str);
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while (dp < edp && SIZE(dp, edp) > sizeof(efidp_header)) {
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efidp_format_device_path(buf, sizeof(buf), dp, SIZE(dp, edp));
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dp = (efidp)((char *)dp + efidp_size(dp));
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printf(" %s\n", buf);
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}
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if (optlen == 0)
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return;
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printf("Options: ");
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if (Aflag)
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asciidump(opt, optlen);
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else if (bflag)
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bindump(opt, optlen);
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else if (uflag)
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utf8dump(opt, optlen);
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else
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hexdump(opt, optlen);
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}
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