along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <bits/local_lim.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
char* gethostname_malloc(void) {
struct utsname u;
+ /* This call tries to return something useful, either the actual hostname
+ * or it makes something up. The only reason it might fail is OOM.
+ * It might even return "localhost" if that's set. */
+
assert_se(uname(&u) >= 0);
if (isempty(u.nodename) || streq(u.nodename, "(none)"))
return strdup(u.nodename);
}
+int gethostname_strict(char **ret) {
+ struct utsname u;
+ char *k;
+
+ /* This call will rather fail than make up a name. It will not return "localhost" either. */
+
+ assert_se(uname(&u) >= 0);
+
+ if (isempty(u.nodename))
+ return -ENXIO;
+
+ if (streq(u.nodename, "(none)"))
+ return -ENXIO;
+
+ if (is_localhost(u.nodename))
+ return -ENXIO;
+
+ k = strdup(u.nodename);
+ if (!k)
+ return -ENOMEM;
+
+ *ret = k;
+ return 0;
+}
+
static bool hostname_valid_char(char c) {
return
(c >= 'a' && c <= 'z') ||
return false;
dot = true;
- n_dots ++;
+ n_dots++;
} else {
if (!hostname_valid_char(*p))
return false;
assert(s);
+ strshorten(s, HOST_NAME_MAX);
+
for (p = s, d = s, dot = true; *p; p++) {
if (*p == '.') {
if (dot)
else
*d = 0;
- strshorten(s, HOST_NAME_MAX);
-
return s;
}