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-rw-r--r--socket.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/socket.c b/socket.c
index df922a9..fe58c3e 100644
--- a/socket.c
+++ b/socket.c
@@ -317,6 +317,45 @@ ip_or_dns_addr_safe (const char *addr, const bool allow_fqdn)
return false;
}
+bool
+mac_addr_safe (const char *mac_addr)
+{
+ /* verify non-NULL */
+ if (!mac_addr)
+ return false;
+
+ /* verify length is within limits */
+ if (strlen (mac_addr) > 17)
+ return false;
+
+ /* verify that all chars are either alphanumeric or ':' and that no
+ alphanumeric substring is greater than 2 chars */
+ {
+ int nnum = 0;
+ const char *p = mac_addr;
+ int c;
+
+ while ((c = *p++))
+ {
+ if ( (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F') )
+ {
+ ++nnum;
+ if (nnum > 2)
+ return false;
+ }
+ else if (c == ':')
+ {
+ nnum = 0;
+ }
+ else
+ return false;
+ }
+ }
+
+ /* error-checking is left to script invoked in lladdr.c */
+ return true;
+}
+
static void
update_remote (const char* host,
struct openvpn_sockaddr *addr,