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/*
File: setfattr.c
(Linux Extended Attributes)
Copyright (C) 2001-2002 Andreas Gruenbacher <a.gruenbacher@bestbits.at>
Copyright (C) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <locale.h>
#include <ctype.h>
#include <libgen.h>
#include <attr/xattr.h>
#include "config.h"
#include "misc.h"
#define CMD_LINE_OPTIONS "n:x:v:h"
#define CMD_LINE_SPEC1 "{-n name} [-v value] [-h] file..."
#define CMD_LINE_SPEC2 "{-x name} [-h] file..."
struct option long_options[] = {
{ "name", 1, 0, 'n' },
{ "remove", 1, 0, 'x' },
{ "value", 1, 0, 'v' },
{ "no-dereference", 0, 0, 'h' },
{ "restore", 1, 0, 'B' },
{ "version", 0, 0, 'V' },
{ "help", 0, 0, 'H' },
{ NULL, 0, 0, 0 }
};
char *opt_name; /* attribute name to set */
char *opt_value; /* attribute value */
int opt_set; /* set an attribute */
int opt_remove; /* remove an attribute */
int opt_restore; /* restore has been run */
int opt_deref = 1; /* dereference symbolic links */
int had_errors;
const char *progname;
int do_set(const char *path, const char *name, const char *value);
const char *decode(const char *value, size_t *size);
int restore(const char *filename);
int hex_digit(char c);
int base64_digit(char c);
const char *strerror_ea(int err)
{
#ifdef __linux__
/* The Linux kernel does not define ENOATTR, but maps it to ENODATA. */
if (err == ENODATA)
return _("No such attribute");
#endif
return strerror(err);
}
static const char *xquote(const char *str, const char *quote_chars)
{
const char *q = quote(str, quote_chars);
if (q == NULL) {
fprintf(stderr, "%s: %s\n", progname, strerror(errno));
exit(1);
}
return q;
}
int do_setxattr(const char *path, const char *name,
const void *value, size_t size)
{
return (opt_deref ? setxattr : lsetxattr)(path, name, value, size, 0);
}
int do_removexattr(const char *path, const char *name)
{
return (opt_deref ? removexattr : lremovexattr)(path, name);
}
int restore(const char *filename)
{
static char *path;
static size_t path_size;
FILE *file;
char *l;
int line = 0, backup_line, status = 0;
if (strcmp(filename, "-") == 0)
file = stdin;
else {
file = fopen(filename, "r");
if (file == NULL) {
fprintf(stderr, "%s: %s: %s\n",
progname, filename, strerror_ea(errno));
return 1;
}
}
for(;;) {
backup_line = line;
while ((l = next_line(file)) != NULL && *l == '\0')
line++;
if (l == NULL)
break;
line++;
if (strncmp(l, "# file: ", 8) != 0) {
if (file != stdin) {
fprintf(stderr, _("%s: %s: No filename found "
"in line %d, aborting\n"),
progname, filename, backup_line);
} else {
fprintf(stderr, _("%s: No filename found in "
"line %d of standard input, "
"aborting\n"),
progname, backup_line);
}
status = 1;
goto cleanup;
} else
l += 8;
l = unquote(l);
if (high_water_alloc((void **)&path, &path_size, strlen(l)+1)) {
perror(progname);
status = 1;
goto cleanup;
}
strcpy(path, l);
while ((l = next_line(file)) != NULL && *l != '\0') {
char *name = l, *value = strchr(l, '=');
line++;
if (value)
*value++ = '\0';
status = do_set(path, unquote(name), value);
}
if (l == NULL)
break;
line++;
}
if (!feof(file)) {
fprintf(stderr, "%s: %s: %s\n", progname, filename,
strerror(errno));
if (!status)
status = 1;
}
cleanup:
if (path)
free(path);
if (file != stdin)
fclose(file);
if (status)
had_errors++;
return status;
}
void help(void)
{
printf(_("%s %s -- set extended attributes\n"), progname, VERSION);
printf(_("Usage: %s %s\n"), progname, CMD_LINE_SPEC1);
printf(_(" %s %s\n"), progname, CMD_LINE_SPEC2);
printf(_(
" -n, --name=name set the value of the named extended attribute\n"
" -x, --remove=name remove the named extended attribute\n"
" -v, --value=value use value as the attribute value\n"
" -h, --no-dereference do not dereference symbolic links\n"
" --restore=file restore extended attributes\n"
" --version print version and exit\n"
" --help this help text\n"));
}
int main(int argc, char *argv[])
{
int opt;
progname = basename(argv[0]);
setlocale(LC_CTYPE, "");
setlocale(LC_MESSAGES, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
while ((opt = getopt_long(argc, argv, CMD_LINE_OPTIONS,
long_options, NULL)) != -1) {
switch(opt) {
case 'n': /* attribute name */
if (opt_name || opt_remove)
goto synopsis;
opt_name = optarg;
opt_set = 1;
break;
case 'h': /* set attribute on symlink itself */
opt_deref = 0;
break;
case 'v': /* attribute value */
if (opt_value || opt_remove)
goto synopsis;
opt_value = optarg;
break;
case 'x': /* remove attribute */
if (opt_name || opt_set)
goto synopsis;
opt_name = optarg;
opt_remove = 1;
break;
case 'B': /* restore */
opt_restore = 1;
restore(optarg);
break;
case 'V':
printf("%s " VERSION "\n", progname);
return 0;
case 'H':
help();
return 0;
default:
goto synopsis;
}
}
if (!(((opt_remove || opt_set) && optind < argc) || opt_restore))
goto synopsis;
while (optind < argc) {
do_set(argv[optind], unquote(opt_name), opt_value);
optind++;
}
return (had_errors ? 1 : 0);
synopsis:
fprintf(stderr, _("Usage: %s %s\n"
" %s %s\n"
"Try `%s --help' for more information.\n"),
progname, CMD_LINE_SPEC1, progname, CMD_LINE_SPEC2, progname);
return 2;
}
int do_set(const char *path, const char *name, const char *value)
{
size_t size = 0;
int error;
if (value) {
size = strlen(value);
value = decode(value, &size);
if (!value)
return 1;
}
if (opt_set || opt_restore)
error = do_setxattr(path, name, value, size);
else
error = do_removexattr(path, name);
if (error < 0) {
fprintf(stderr, "%s: %s: %s\n",
progname, xquote(path, "\n\r"), strerror_ea(errno));
had_errors++;
return 1;
}
return 0;
}
const char *decode(const char *value, size_t *size)
{
static char *decoded;
static size_t decoded_size;
if (value[0] == '0' && (value[1] == 'x' || value[1] == 'X')) {
const char *v = value+2, *end = value + *size;
char *d;
if (high_water_alloc((void **)&decoded, &decoded_size,
*size / 2)) {
fprintf(stderr, "%s: %s\n",
progname, strerror_ea(errno));
had_errors++;
return NULL;
}
d = decoded;
while (v < end) {
int d1, d0;
while (v < end && isspace(*v))
v++;
if (v == end)
break;
d1 = hex_digit(*v++);
while (v < end && isspace(*v))
v++;
if (v == end) {
bad_hex_encoding:
fprintf(stderr, "bad input encoding\n");
had_errors++;
return NULL;
}
d0 = hex_digit(*v++);
if (d1 < 0 || d0 < 0)
goto bad_hex_encoding;
*d++ = ((d1 << 4) | d0);
}
*size = d - decoded;
} else if (value[0] == '0' && (value[1] == 's' || value[1] == 'S')) {
const char *v = value+2, *end = value + *size;
int d0, d1, d2, d3;
char *d;
if (high_water_alloc((void **)&decoded, &decoded_size,
*size / 4 * 3)) {
fprintf(stderr, "%s: %s\n",
progname, strerror_ea(errno));
had_errors++;
return NULL;
}
d = decoded;
for(;;) {
while (v < end && isspace(*v))
v++;
if (v == end) {
d0 = d1 = d2 = d3 = -2;
break;
}
if (v + 4 > end) {
bad_base64_encoding:
fprintf(stderr, "bad input encoding\n");
had_errors++;
return NULL;
}
d0 = base64_digit(*v++);
d1 = base64_digit(*v++);
d2 = base64_digit(*v++);
d3 = base64_digit(*v++);
if (d0 < 0 || d1 < 0 || d2 < 0 || d3 < 0)
break;
*d++ = (char)((d0 << 2) | (d1 >> 4));
*d++ = (char)((d1 << 4) | (d2 >> 2));
*d++ = (char)((d2 << 6) | d3);
}
if (d0 == -2) {
if (d1 != -2 || d2 != -2 || d3 != -2)
goto bad_base64_encoding;
goto base64_end;
}
if (d0 == -1 || d1 < 0 || d2 == -1 || d3 == -1)
goto bad_base64_encoding;
*d++ = (char)((d0 << 2) | (d1 >> 4));
if (d2 != -2)
*d++ = (char)((d1 << 4) | (d2 >> 2));
else {
if (d1 & 0x0F || d3 != -2)
goto bad_base64_encoding;
goto base64_end;
}
if (d3 != -2)
*d++ = (char)((d2 << 6) | d3);
else if (d2 & 0x03)
goto bad_base64_encoding;
base64_end:
while (v < end && isspace(*v))
v++;
if (v + 4 <= end && *v == '=') {
if (*++v != '=' || *++v != '=' || *++v != '=')
goto bad_base64_encoding;
v++;
}
while (v < end && isspace(*v))
v++;
if (v < end)
goto bad_base64_encoding;
*size = d - decoded;
} else {
const char *v = value, *end = value + *size;
char *d;
if (end > v+1 && *v == '"' && *(end-1) == '"') {
v++;
end--;
}
if (high_water_alloc((void **)&decoded, &decoded_size, *size)) {
fprintf(stderr, "%s: %s\n",
progname, strerror_ea(errno));
had_errors++;
return NULL;
}
d = decoded;
while (v < end) {
if (v[0] == '\\') {
if (v[1] == '\\' || v[1] == '"') {
*d++ = *++v; v++;
} else if (v[1] >= '0' && v[1] <= '7') {
int c = 0;
v++;
c = (*v++ - '0');
if (*v >= '0' && *v <= '7')
c = (c << 3) + (*v++ - '0');
if (*v >= '0' && *v <= '7')
c = (c << 3) + (*v++ - '0');
*d++ = c;
} else
*d++ = *v++;
} else
*d++ = *v++;
}
*size = d - decoded;
}
return decoded;
}
int hex_digit(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else
return -1;
}
int base64_digit(char c)
{
if (c >= 'A' && c <= 'Z')
return c - 'A';
else if (c >= 'a' && c <= 'z')
return 26 + c - 'a';
else if (c >= '0' && c <= '9')
return 52 + c - '0';
else if (c == '+')
return 62;
else if (c == '/')
return 63;
else if (c == '=')
return -2;
else
return -1;
}
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