[riot-notifications] [RIOT-OS/RIOT] Add MUD URL option to DHCPv6 client (#15508)

[benpicco]

@benpicco commented on this pull request.



> @@ -247,6 +247,22 @@ static inline size_t _compose_elapsed_time_opt(dhcpv6_opt_elapsed_time_t *time)
     return len + sizeof(dhcpv6_opt_t);
 }
 
+static inline size_t _compose_mud_url_opt(dhcpv6_opt_mud_url_t *mud_url_opt,
+                                          const char *mud_url, size_t len_max)
+{
+    uint16_t len = strlen(mud_url);
+
+    if (len > len_max) {
+        assert(0);
+        return 0;
+    }
+
+    mud_url_opt->type = byteorder_htons(DHCPV6_OPT_MUD_URL);
+    mud_url_opt->len = byteorder_htons(len);
+    strncpy(mud_url_opt->mudString, mud_url, len);

```suggestion
    strncpy(mud_url_opt->mudString, mud_url, len_max);
```


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