netdev - RE: [PATCH] ss: Enclose IPv6 address in brackets

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Date:   Tue, 1 Aug 2017 11:11:03 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Florian Lehner' <dev@...-flo.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH] ss: Enclose IPv6 address in brackets

From: Florian Lehner
> Sent: 29 July 2017 13:29
> This patch adds support for RFC2732 IPv6 address format with brackets
> for the tool ss. So output for ss changes from
> 2a00:1450:400a:804::200e:443 to [2a00:1450:400a:804::200e]:443 for IPv6
> addresses with attached port number.
> 
> Signed-off-by: Lehner Florian <dev@...-flo.net>
> ---
>  misc/ss.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/misc/ss.c b/misc/ss.c
> index 12763c9..db39c93 100644
> --- a/misc/ss.c
> +++ b/misc/ss.c
> @@ -1059,7 +1059,11 @@ static void inet_addr_print(const inet_prefix *a,
> int port, unsigned int ifindex
>  			ap = format_host(AF_INET, 4, a->data);
>  		}
>  	} else {
> -		ap = format_host(a->family, 16, a->data);
> +		if (a->family == AF_INET6) {
> +			sprintf(buf, "[%s]", format_host(a->family, 16, a->data));
> +		} else {
> +			ap = format_host(a->family, 16, a->data);
> +		}
>  		est_len = strlen(ap);
...

There are some strange things going on with global variables if this works at all.
The text form of the address is in buf[] in one path and *ap in the other.

One option might be to call format_host() then use strchr(ap, ':')
to add [] if the string contains any ':'.

	David