52467047aa
Use recent best practices for Copyright form at the top of the license: 1. Remove all the All Rights Reserved clauses on our stuff. Where we piggybacked others, use a separate line to make things clear. 2. Use "Netflix, Inc." everywhere. 3. Use a single line for the copyright for grep friendliness. 4. Use date ranges in all places for our stuff. Approved by: Netflix Legal (who gave me the form), adrian@ (pmc files)
386 lines
8.2 KiB
C
386 lines
8.2 KiB
C
/*-
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* Copyright (c) 2016 Netflix, Inc.
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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 <fcntl.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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/* options descriptor */
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static struct option longopts[] = {
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{ "append", no_argument, NULL, 'a' },
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{ "ascii", no_argument, NULL, 'A' },
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{ "attributes", required_argument, NULL, 't' },
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{ "binary", no_argument, NULL, 'b' },
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{ "delete", no_argument, NULL, 'D' },
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{ "device", no_argument, NULL, 'd' },
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{ "device-path", no_argument, NULL, 'd' },
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{ "fromfile", required_argument, NULL, 'f' },
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{ "guid", no_argument, NULL, 'g' },
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{ "hex", no_argument, NULL, 'H' },
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{ "list-guids", no_argument, NULL, 'L' },
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{ "list", no_argument, NULL, 'l' },
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{ "load-option", no_argument, NULL, 'O' },
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{ "name", required_argument, NULL, 'n' },
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{ "no-name", no_argument, NULL, 'N' },
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{ "print", no_argument, NULL, 'p' },
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{ "print-decimal", no_argument, NULL, 'd' },
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{ "raw-guid", no_argument, NULL, 'R' },
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{ "utf8", no_argument, NULL, 'u' },
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{ "write", no_argument, NULL, 'w' },
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{ NULL, 0, NULL, 0 }
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};
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static int aflag, Aflag, bflag, dflag, Dflag, gflag, Hflag, Nflag,
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lflag, Lflag, Rflag, wflag, pflag, uflag, load_opt_flag;
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static char *varname;
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static char *fromfile;
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static u_long attrib = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
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static void
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usage(void)
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{
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errx(1, "efivar [-abdDHlLNpRtuw] [-n name] [-f file] [--append] [--ascii]\n"
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"\t[--attributes] [--binary] [--delete] [--fromfile file] [--hex]\n"
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"\t[--list-guids] [--list] [--load-option] [--name name] [--no-name]\n"
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"\t[--print] [--print-decimal] [--raw-guid] [--utf8] [--write]\n"
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"\tname[=value]");
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}
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static void
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breakdown_name(char *name, efi_guid_t *guid, char **vname)
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{
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char *cp;
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cp = strrchr(name, '-');
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if (cp == NULL)
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errx(1, "Invalid name: %s", name);
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*vname = cp + 1;
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*cp = '\0';
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if (efi_name_to_guid(name, guid) < 0)
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errx(1, "Invalid guid %s", name);
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}
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static uint8_t *
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get_value(char *val, size_t *datalen)
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{
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static char buffer[16*1024];
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if (val != NULL) {
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*datalen = strlen(val);
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return ((uint8_t *)val);
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}
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/* Read from stdin */
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*datalen = sizeof(buffer);
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*datalen = read(0, buffer, *datalen);
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return ((uint8_t *)buffer);
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}
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static void
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append_variable(char *name, char *val)
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{
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char *vname;
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efi_guid_t guid;
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size_t datalen;
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uint8_t *data;
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breakdown_name(name, &guid, &vname);
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data = get_value(val, &datalen);
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if (efi_append_variable(guid, vname, data, datalen, attrib) < 0)
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err(1, "efi_append_variable");
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}
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static void
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delete_variable(char *name)
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{
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char *vname;
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efi_guid_t guid;
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breakdown_name(name, &guid, &vname);
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if (efi_del_variable(guid, vname) < 0)
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err(1, "efi_del_variable");
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}
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static void
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write_variable(char *name, char *val)
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{
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char *vname;
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efi_guid_t guid;
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size_t datalen;
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uint8_t *data;
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breakdown_name(name, &guid, &vname);
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data = get_value(val, &datalen);
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if (efi_set_variable(guid, vname, data, datalen, attrib) < 0)
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err(1, "efi_set_variable");
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}
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static void
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devpath_dump(uint8_t *data, size_t datalen)
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{
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char buffer[1024];
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efidp_format_device_path(buffer, sizeof(buffer),
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(const_efidp)data, datalen);
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if (!Nflag)
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printf(": ");
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printf("%s\n", buffer);
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}
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static void
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pretty_guid(efi_guid_t *guid, char **gname)
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{
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char *pretty = NULL;
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if (gflag)
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efi_guid_to_name(guid, &pretty);
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if (pretty == NULL)
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efi_guid_to_str(guid, gname);
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else
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*gname = pretty;
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}
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static void
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print_var(efi_guid_t *guid, char *name)
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{
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uint32_t att;
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uint8_t *data;
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size_t datalen;
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char *gname = NULL;
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int rv;
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if (guid)
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pretty_guid(guid, &gname);
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if (pflag || fromfile) {
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if (fromfile) {
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int fd;
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fd = open(fromfile, O_RDONLY);
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if (fd < 0)
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err(1, "open %s", fromfile);
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data = malloc(64 * 1024);
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if (data == NULL)
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err(1, "malloc");
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datalen = read(fd, data, 64 * 1024);
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if (datalen <= 0)
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err(1, "read");
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close(fd);
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} else {
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rv = efi_get_variable(*guid, name, &data, &datalen, &att);
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if (rv < 0)
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err(1, "fetching %s-%s", gname, name);
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}
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if (!Nflag)
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printf("%s-%s\n", gname, name);
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if (load_opt_flag)
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efi_print_load_option(data, datalen, Aflag, bflag, uflag);
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else if (Aflag)
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asciidump(data, datalen);
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else if (uflag)
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utf8dump(data, datalen);
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else if (bflag)
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bindump(data, datalen);
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else if (dflag)
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devpath_dump(data, datalen);
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else
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hexdump(data, datalen);
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} else {
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printf("%s-%s", gname, name);
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}
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free(gname);
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if (!Nflag)
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printf("\n");
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}
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static void
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print_variable(char *name)
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{
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char *vname;
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efi_guid_t guid;
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breakdown_name(name, &guid, &vname);
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print_var(&guid, vname);
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}
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static void
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print_variables(void)
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{
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int rv;
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char *name = NULL;
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efi_guid_t *guid = NULL;
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while ((rv = efi_get_next_variable_name(&guid, &name)) > 0)
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print_var(guid, name);
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if (rv < 0)
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err(1, "Error listing names");
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}
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static void
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print_known_guid(void)
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{
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struct uuid_table *tbl;
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int i, n;
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n = efi_known_guid(&tbl);
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for (i = 0; i < n; i++)
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printf("%s %s\n", tbl[i].uuid_str, tbl[i].name);
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}
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static void
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parse_args(int argc, char **argv)
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{
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int ch, i;
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while ((ch = getopt_long(argc, argv, "aAbdDf:gHlLNn:OpRt:uw",
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longopts, NULL)) != -1) {
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switch (ch) {
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case 'a':
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aflag++;
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break;
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case 'A':
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Aflag++;
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break;
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case 'b':
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bflag++;
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break;
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case 'd':
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dflag++;
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break;
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case 'D':
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Dflag++;
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break;
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case 'g':
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gflag++;
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break;
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case 'H':
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Hflag++;
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break;
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case 'l':
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lflag++;
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break;
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case 'L':
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Lflag++;
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break;
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case 'n':
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varname = optarg;
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break;
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case 'N':
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Nflag++;
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break;
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case 'O':
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load_opt_flag++;
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break;
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case 'p':
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pflag++;
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break;
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case 'R':
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Rflag++;
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break;
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case 't':
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attrib = strtoul(optarg, NULL, 16);
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break;
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case 'u':
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uflag++;
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break;
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case 'w':
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wflag++;
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break;
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case 'f':
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free(fromfile);
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fromfile = strdup(optarg);
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break;
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case 0:
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errx(1, "unknown or unimplemented option\n");
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 1)
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varname = argv[0];
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if (aflag + Dflag + wflag > 1) {
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warnx("Can only use one of -a (--append), "
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"-D (--delete) and -w (--write)");
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usage();
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}
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if (aflag + Dflag + wflag > 0 && varname == NULL) {
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warnx("Must specify a variable for -a (--append), "
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"-D (--delete) or -w (--write)");
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usage();
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}
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if (aflag)
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append_variable(varname, NULL);
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else if (Dflag)
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delete_variable(varname);
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else if (wflag)
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write_variable(varname, NULL);
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else if (Lflag)
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print_known_guid();
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else if (fromfile) {
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Nflag = 1;
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print_var(NULL, NULL);
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} else if (varname) {
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pflag++;
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print_variable(varname);
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} else if (argc > 0) {
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pflag++;
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for (i = 0; i < argc; i++)
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print_variable(argv[i]);
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} else
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print_variables();
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}
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int
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main(int argc, char **argv)
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{
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parse_args(argc, argv);
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}
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