macOS xattr-acls extra stuff

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rm -rf /tmp/test*
echo test >/tmp/test
chmod +a "everyone deny write,writeattr,writeextattr,writesecurity,chown" /tmp/test
./get_acls test
ACL for test:
!#acl 1
group:ABCDEFAB-CDEF-ABCD-EFAB-CDEF0000000C:everyone:12:deny:write,writeattr,writeextattr,writesecurity,chown

ACL in hex: \x21\x23\x61\x63\x6c\x20\x31\x0a\x67\x72\x6f\x75\x70\x3a\x41\x42\x43\x44\x45\x46\x41\x42\x2d\x43\x44\x45\x46\x2d\x41\x42\x43\x44\x2d\x45\x46\x41\x42\x2d\x43\x44\x45\x46\x30\x30\x30\x30\x30\x30\x30\x43\x3a\x65\x76\x65\x72\x79\x6f\x6e\x65\x3a\x31\x32\x3a\x64\x65\x6e\x79\x3a\x77\x72\x69\x74\x65\x2c\x77\x72\x69\x74\x65\x61\x74\x74\x72\x2c\x77\x72\x69\x74\x65\x65\x78\x74\x61\x74\x74\x72\x2c\x77\x72\x69\x74\x65\x73\x65\x63\x75\x72\x69\x74\x79\x2c\x63\x68\x6f\x77\x6e\x0a

Código de get_acls

```c // gcc -o get_acls get_acls #include #include #include

int main(int argc, char *argv[]) { if (argc != 2) { fprintf(stderr, "Usage: %s \n", argv[0]); return 1; }

const char *filepath = argv[1]; acl_t acl = acl_get_file(filepath, ACL_TYPE_EXTENDED); if (acl == NULL) { perror("acl_get_file"); return 1; }

char *acl_text = acl_to_text(acl, NULL); if (acl_text == NULL) { perror("acl_to_text"); acl_free(acl); return 1; }

printf("ACL for %s:\n%s\n", filepath, acl_text);

// Convert acl_text to hexadecimal and print it printf("ACL in hex: "); for (char *c = acl_text; *c != '\0'; c++) { printf("\x%02x", (unsigned char)*c); } printf("\n");

acl_free(acl); acl_free(acl_text); return 0; }

</details>
```bash
# Lets add the xattr com.apple.xxx.xxxx with the acls
mkdir start
mkdir start/protected
./set_xattr start/protected
echo something > start/protected/something