On Sun, 11 Aug 2024 18:00:03 +0200,
Florian Obser <florian@openbsd.org> wrote:
> 
> localhost is just a weird spelling for 127.0.0.1...
>
> I'm not entirely sure how to tickle this code though.
> 
> OK?
> 
> diff --git inet.c inet.c
> index 88d37be055e..a6c0a4b8282 100644
> --- inet.c
> +++ inet.c
> @@ -813,7 +813,6 @@ static char *
>  getrpcportnam(in_port_t port, int proto)
>  {
>  	struct sockaddr_in server_addr;
> -	struct hostent *hp;
>  	static struct pmaplist *head;
>  	int socket = RPC_ANYSOCK;
>  	struct timeval minutetimeout;
> @@ -828,11 +827,7 @@ getrpcportnam(in_port_t port, int proto)
>  		first = 1;
>  		memset(&server_addr, 0, sizeof server_addr);
>  		server_addr.sin_family = AF_INET;
> -		if ((hp = gethostbyname("localhost")) != NULL)
> -			memmove((caddr_t)&server_addr.sin_addr, hp->h_addr,
> -			    hp->h_length);
> -		else
> -			(void) inet_aton("0.0.0.0", &server_addr.sin_addr);
> +		(void) inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr);
>  
>  		minutetimeout.tv_sec = 60;
>  		minutetimeout.tv_usec = 0;
>

The current code handles the case where localhost is 127.0.0.2 and
/etc/hosts has relevant records.

As far as I can see in RFC 1122 and 6890, any address from 127.0.0.0/8 can
be used as a loopback.

Am I missing the place where 127.0.0.1 is required to be the only possible
localhost address?

-- 
wbr, Kirill