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xattr-util.c
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xattr-util.c
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#include <sys/xattr.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
int show_xattr(char *file, char *name)
{
int options = XATTR_NOFOLLOW;
int size = getxattr(file, name, NULL, 0, 0, options);
if (size < 0) {
return 0;
}
void *result = malloc(size);
if (NULL != result) {
size_t read_size = getxattr(file, name, result, size, 0, options);
if (read_size >= 0) {
write(1, result, read_size);
free(result);
return 1;
}
free(result);
}
return 0;
}
int main(int argc, char *argv[]) {
if (argc < 3) {
fprintf(stderr,"Usage: %s [l | a | r attr | w attr val] file\n",
argv[0]);
return 1;
}
int options = XATTR_NOFOLLOW;
if (argv[1][0] == 'r') {
/* Read mode */
if (argc != 4) {
fprintf(stderr, "Wrong number of arguments\n");
return 1;
}
if (show_xattr(argv[3], argv[2]))
return 0;
perror(argv[0]);
return 1;
}
else if (argv[1][0] == 'w') {
/* Write mode */
if (argc != 5) {
fprintf(stderr, "Wrong number of arguments\n");
return 1;
}
int code = setxattr(argv[4], argv[2], argv[3], strlen(argv[3])+1, 0,
options);
if (code < 0) {
perror(argv[0]);
return 1;
}
return 0;
}
else if (argv[1][0] == 'l') {
if (argc != 3) {
fprintf(stderr, "Wrong number of arguments\n");
return 1;
}
size_t size = listxattr(argv[2], NULL, 0, options);
if (size == 0) {
return 0;
}
if (size < 0) {
perror(argv[0]);
return 1;
}
char *buf = (char *)malloc(size);
size = listxattr(argv[2], buf, size, options);
if (size < 0) {
perror(argv[0]);
return 1;
}
char *end = buf + size;
while(buf < end) {
printf("%s\n", buf);
buf += strlen(buf) + 1;
}
return 0;
}
else if (argv[1][0] == 'a') {
if (argc != 3) {
fprintf(stderr, "Wrong number of arguments\n");
return 1;
}
size_t size = listxattr(argv[2], NULL, 0, options);
if (size == 0) {
return 0;
}
if (size < 0) {
perror(argv[0]);
return 1;
}
char *buf = (char *)malloc(size);
size = listxattr(argv[2], buf, size, options);
if (size < 0) {
perror(argv[0]);
return 1;
}
char *end = buf + size;
void *value;
while(buf < end) {
printf("%s: \"", buf);
fflush(stdout);
if (!show_xattr(argv[2], buf)) {
perror(argv[0]);
return 1;
}
printf("\"\n");
buf += strlen(buf) + 1;
}
return 0;
}
else {
fprintf(stderr, "Bad arguments\n");
return 1;
}
}