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/*
Unix SMB/CIFS implementation.
xattr renaming
Copyright (C) Ralph Boehme 2017
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 3 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 "includes.h"
#include "system/filesys.h"
#include <popt.h>
#include <ftw.h>
static struct rename_xattr_state {
int follow_symlink;
int print;
int force;
int verbose;
char *xattr_from;
char *xattr_to;
} state;
static int rename_xattr(const char *path,
const struct stat *sb,
int typeflag,
struct FTW *ftwbuf)
{
ssize_t len;
int ret;
if (typeflag == FTW_SL) {
d_printf("Ignoring symlink %s\n", path);
return 0;
}
if (state.verbose) {
d_printf("%s\n", path);
}
len = getxattr(path, state.xattr_from, NULL, 0);
if (len < 0) {
if (errno == ENOATTR) {
return 0;
}
d_printf("getxattr [%s] failed [%s]\n",
path, strerror(errno));
return -1;
}
{
uint8_t buf[len];
len = getxattr(path, state.xattr_from, &buf[0], len);
if (len == -1) {
d_printf("getxattr [%s] failed [%s]\n",
path, strerror(errno));
return -1;
}
ret = setxattr(path, state.xattr_to, &buf[0], len, XATTR_CREATE);
if (ret != 0) {
if (errno != EEXIST) {
d_printf("setxattr [%s] failed [%s]\n",
path, strerror(errno));
return -1;
}
if (!state.force) {
d_printf("destination [%s:%s] exists, use -f to force\n",
path, state.xattr_to);
return -1;
}
ret = setxattr(path, state.xattr_to, &buf[0], len, XATTR_REPLACE);
if (ret != 0) {
d_printf("setxattr [%s:%s] failed [%s]\n",
path, state.xattr_to, strerror(errno));
return -1;
}
}
ret = removexattr(path, state.xattr_from);
if (ret != 0) {
d_printf("removexattr [%s:%s] failed [%s]\n",
path, state.xattr_from, strerror(errno));
return -1;
}
if (state.print) {
d_printf("Renamed %s to %s on %s\n",
state.xattr_from, state.xattr_to, path);
}
}
return 0;
}
int main(int argc, const char *argv[])
{
int c;
const char *path = NULL;
poptContext pc = NULL;
struct poptOption long_options[] = {
POPT_AUTOHELP
{
.longName = "from",
.shortName = 's',
.argInfo = POPT_ARG_STRING,
.arg = &state.xattr_from,
.val = 's',
.descrip = "xattr source name",
},
{
.longName = "to",
.shortName = 'd',
.argInfo = POPT_ARG_STRING,
.arg = &state.xattr_to,
.val = 'd',
.descrip = "xattr destination name",
},
{
.longName = "follow-symlinks",
.shortName = 'l',
.argInfo = POPT_ARG_NONE,
.arg = &state.follow_symlink,
.val = 'l',
.descrip = "follow symlinks, the default is to "
"ignore them",
},
{
.longName = "print",
.shortName = 'p',
.argInfo = POPT_ARG_NONE,
.arg = &state.print,
.val = 'p',
.descrip = "print files where the xattr got "
"renamed",
},
{
.longName = "verbose",
.shortName = 'v',
.argInfo = POPT_ARG_NONE,
.arg = &state.verbose,
.val = 'v',
.descrip = "print files as they are checked",
},
{
.longName = "force",
.shortName = 'f',
.argInfo = POPT_ARG_NONE,
.arg = &state.force,
.val = 'f',
.descrip = "force overwriting of destination xattr",
},
POPT_TABLEEND
};
TALLOC_CTX *frame = talloc_stackframe();
const char *s = NULL;
int ret = 0;
if (getuid() != 0) {
d_printf("%s only works as root!\n", argv[0]);
ret = 1;
goto done;
}
pc = poptGetContext(NULL, argc, argv, long_options, 0);
poptSetOtherOptionHelp(pc, "-s STRING -d STRING PATH [PATH ...]");
while ((c = poptGetNextOpt(pc)) != -1) {
switch (c) {
case 's':
s = poptGetOptArg(pc);
state.xattr_from = talloc_strdup(frame, s);
if (state.xattr_from == NULL) {
ret = 1;
goto done;
}
break;
case 'd':
s = poptGetOptArg(pc);
state.xattr_to = talloc_strdup(frame, s);
if (state.xattr_to == NULL) {
ret = 1;
goto done;
}
break;
case POPT_ERROR_BADOPT:
fprintf(stderr, "\nInvalid option %s: %s\n\n",
poptBadOption(pc, 0), poptStrerror(c));
poptPrintUsage(pc, stderr, 0);
exit(1);
}
}
if (state.xattr_from == NULL || state.xattr_to == NULL) {
poptPrintUsage(pc, stderr, 0);
ret = 1;
goto done;
}
if (poptPeekArg(pc) == NULL) {
poptPrintUsage(pc, stderr, 0);
ret = 1;
goto done;
}
while ((path = poptGetArg(pc)) != NULL) {
ret = nftw(path, rename_xattr, 256,
state.follow_symlink ? 0 : FTW_PHYS);
}
done:
poptFreeContext(pc);
TALLOC_FREE(frame);
return ret;
}
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