2 files changed, 21 insertions, 0 deletions
diff --git a/src/basic/socket-util.c b/src/basic/socket-util.c
index 9ec901261..68773d54c 100644
--- a/src/basic/socket-util.c
+++ b/src/basic/socket-util.c
@@ -904,6 +904,26 @@ bool ifname_valid(const char *p) {
         return true;
 }
 
+bool address_label_valid(const char *p) {
+
+        if (isempty(p))
+                return false;
+
+        if (strlen(p) >= IFNAMSIZ)
+                return false;
+
+        while (*p) {
+                if ((uint8_t) *p >= 127U)
+                        return false;
+
+                if ((uint8_t) *p <= 31U)
+                        return false;
+                p++;
+        }
+
+        return true;
+}
+
 int getpeercred(int fd, struct ucred *ucred) {
         socklen_t n = sizeof(struct ucred);
         struct ucred u;
diff --git a/src/basic/socket-util.h b/src/basic/socket-util.h
index 195bfb830..8e18eed8c 100644
--- a/src/basic/socket-util.h
+++ b/src/basic/socket-util.h
@@ -131,6 +131,7 @@ int ip_tos_from_string(const char *s);
 #endif // 0
 
 bool ifname_valid(const char *p);
+bool address_label_valid(const char *p);
 
 int getpeercred(int fd, struct ucred *ucred);
 int getpeersec(int fd, char **ret);