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authorJukka Rissanen <jukka.rissanen@linux.intel.com>2012-05-03 13:15:07 (GMT)
committerPatrik Flykt <patrik.flykt@linux.intel.com>2012-05-04 09:50:49 (GMT)
commit26ace5c59f790bce0f1988b88874c6f2c480fd5a (patch)
treeaf54b1a2d1924e6b99c6b84dabb2b6df5bda6dec /src/inet.c
parentc1b968984212b46bea1330f5ae029507b9bfded9 (diff)
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inet: Add function that checks if the hostname is valid
Diffstat (limited to 'src/inet.c')
-rw-r--r--src/inet.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/src/inet.c b/src/inet.c
index e01bfb3..effa68c 100644
--- a/src/inet.c
+++ b/src/inet.c
@@ -44,6 +44,7 @@
#include <netinet/icmp6.h>
#include <fcntl.h>
#include <linux/if_tun.h>
+#include <ctype.h>
#include "connman.h"
@@ -2172,3 +2173,50 @@ int __connman_inet_rtnl_addattr32(struct nlmsghdr *n, size_t maxlen, int type,
return 0;
}
+
+/* Check routine modified from ics-dhcp 4.2.3-P2 */
+connman_bool_t connman_inet_check_hostname(const char *ptr, size_t len)
+{
+ const char *p;
+
+ /*
+ * Not empty or complete length not over 255 characters.
+ */
+ if ((len == 0) || (len > 256))
+ return FALSE;
+
+ /*
+ * Consists of [[:alnum:]-]+ labels separated by [.]
+ * a [_] is against RFC but seems to be "widely used"
+ */
+ for (p = ptr; (*p != 0) && (len-- > 0); p++) {
+
+ if ((*p == '-') || (*p == '_')) {
+ /*
+ * Not allowed at begin or end of a label.
+ */
+ if (((p - ptr) == 0) || (len == 0) || (p[1] == '.'))
+ return FALSE;
+
+ } else if (*p == '.') {
+ /*
+ * Each label has to be 1-63 characters;
+ * we allow [.] at the end ('foo.bar.')
+ */
+ size_t d = p - ptr;
+
+ if ((d <= 0) || (d >= 64))
+ return FALSE;
+
+ ptr = p + 1; /* Jump to the next label */
+
+ } else if (isalnum((unsigned char)*p) == 0) {
+ /*
+ * Also numbers at the begin are fine
+ */
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}