diff options
Diffstat (limited to '')
-rw-r--r-- | src/basic/keyring-util.c (renamed from src/shared/keyring-util.c) | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/shared/keyring-util.c b/src/basic/keyring-util.c index fadd90e..c32bd50 100644 --- a/src/shared/keyring-util.c +++ b/src/basic/keyring-util.c @@ -33,3 +33,34 @@ int keyring_read(key_serial_t serial, void **ret, size_t *ret_size) { bufsize = (size_t) n; } } + +int keyring_describe(key_serial_t serial, char **ret) { + _cleanup_free_ char *tuple = NULL; + size_t sz = 64; + int c = -1; /* Workaround for maybe-uninitialized false positive due to missing_syscall indirection */ + + assert(ret); + + for (;;) { + tuple = new(char, sz); + if (!tuple) + return log_oom_debug(); + + c = keyctl(KEYCTL_DESCRIBE, serial, (unsigned long) tuple, c, 0); + if (c < 0) + return log_debug_errno(errno, "Failed to describe key id %d: %m", serial); + + if ((size_t) c <= sz) + break; + + sz = c; + free(tuple); + } + + /* The kernel returns a final NUL in the string, verify that. */ + assert(tuple[c-1] == 0); + + *ret = TAKE_PTR(tuple); + + return 0; +} |