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

[Jan Romann]

@JKRhb commented on this pull request.



> @@ -254,7 +254,7 @@ static inline size_t _compose_mud_url_opt(dhcpv6_opt_mud_url_t *mud_url_opt,
 
     mud_url_opt->type = byteorder_htons(DHCPV6_OPT_MUD_URL);
     mud_url_opt->len = byteorder_htons(len);
-    strncpy(mud_url_opt->mudString, mud_url);
+    strncpy(mud_url_opt->mudString, mud_url, len);

I agree, there is indeed room for improvement! Would you say that this deserves the opening of an issue?

I added a similar check as you suggested before to the `_add_ia_pd_from_config` function in commit 0299a36 (I hope the commit message is appropriate). Right now, no space in the buffer also causes a crash in this function. 

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