linux-kernel - Re: [PATCH V2 06/18] Tools: hv: Further refactor kvp_get_ip

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Date:	Tue, 14 Aug 2012 02:46:11 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org,
	olaf@...fle.de, apw@...onical.com
Subject: Re: [PATCH V2 06/18] Tools: hv: Further refactor
 kvp_get_ip_address()

On Mon, 2012-08-13 at 10:06 -0700, K. Y. Srinivasan wrote:
> In preparation for making kvp_get_ip_address() more generic, factor out
> the code for handling IP addresses.
> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Reviewed-by: Olaf Hering <olaf@...fle.de>
> Reviewed-by: Ben Hutchings <ben@...adent.org.uk>

I looked at your last patch set, so in a sense these have been reviewed
by me.  But the 'Reviewed-by' line in a commit message means the
reviewer thinks it's OK; the reviewer must say that, and I didn't.

Ben.

> ---
>  tools/hv/hv_kvp_daemon.c |   94 ++++++++++++++++++++-------------------------
>  1 files changed, 42 insertions(+), 52 deletions(-)
> 
> diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
> index 3af37f0..3dc989f 100644
> --- a/tools/hv/hv_kvp_daemon.c
> +++ b/tools/hv/hv_kvp_daemon.c
> @@ -491,17 +491,50 @@ done:
>  	return;
>  }
>  
> +static int kvp_process_ip_address(void *addrp,
> +				int family, char *buffer,
> +				int length,  int *offset)
> +{
> +	struct sockaddr_in *addr;
> +	struct sockaddr_in6 *addr6;
> +	int addr_length;
> +	char tmp[50];
> +	const char *str;
> +
> +	if (family == AF_INET) {
> +		addr = (struct sockaddr_in *)addrp;
> +		str = inet_ntop(family, &addr->sin_addr, tmp, 50);
> +		addr_length = INET_ADDRSTRLEN;
> +	} else {
> +		addr6 = (struct sockaddr_in6 *)addrp;
> +		str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
> +		addr_length = INET6_ADDRSTRLEN;
> +	}
> +
> +	if ((length - *offset) < addr_length + 1)
> +		return 1;
> +	if (str == NULL) {
> +		strcpy(buffer, "inet_ntop failed\n");
> +		return 1;
> +	}
> +	if (*offset == 0)
> +		strcpy(buffer, tmp);
> +	else
> +		strcat(buffer, tmp);
> +	strcat(buffer, ";");
> +
> +	*offset += strlen(str) + 1;
> +	return 0;
> +}
> +
>  static int
>  kvp_get_ip_address(int family, char *if_name, int op,
>  		 void  *out_buffer, int length)
>  {
>  	struct ifaddrs *ifap;
>  	struct ifaddrs *curp;
> -	int ipv4_len = strlen("255.255.255.255") + 1;
> -	int ipv6_len = strlen("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")+1;
>  	int offset = 0;
>  	const char *str;
> -	char tmp[50];
>  	int error = 0;
>  	char *buffer;
>  	struct hv_kvp_ipaddr_value *ip_buffer;
> @@ -556,55 +589,12 @@ kvp_get_ip_address(int family, char *if_name, int op,
>  			continue;
>  		}
>  
> -		if ((curp->ifa_addr->sa_family == AF_INET) &&
> -			((family == AF_INET) || (family == 0))) {
> -			struct sockaddr_in *addr =
> -			(struct sockaddr_in *) curp->ifa_addr;
> -
> -			str = inet_ntop(AF_INET, &addr->sin_addr, tmp, 50);
> -			if (str == NULL) {
> -				strcpy(buffer, "inet_ntop failed\n");
> -				error = 1;
> -				goto getaddr_done;
> -			}
> -			if (offset == 0)
> -				strcpy(buffer, tmp);
> -			else
> -				strcat(buffer, tmp);
> -			strcat(buffer, ";");
> -
> -			offset += strlen(str) + 1;
> -			if ((length - offset) < (ipv4_len + 1))
> -				goto getaddr_done;
> -
> -		} else if ((family == AF_INET6) || (family == 0)) {
> -
> -			/*
> -			 * We only support AF_INET and AF_INET6
> -			 * and the list of addresses is separated by a ";".
> -			 */
> -			struct sockaddr_in6 *addr =
> -				(struct sockaddr_in6 *) curp->ifa_addr;
> -
> -			str = inet_ntop(AF_INET6,
> -					&addr->sin6_addr.s6_addr,
> -					tmp, 50);
> -			if (str == NULL) {
> -				strcpy(buffer, "inet_ntop failed\n");
> -				error = 1;
> -				goto getaddr_done;
> -			}
> -			if (offset == 0)
> -				strcpy(buffer, tmp);
> -			else
> -				strcat(buffer, tmp);
> -			strcat(buffer, ";");
> -			offset += strlen(str) + 1;
> -			if ((length - offset) < (ipv6_len + 1))
> -				goto getaddr_done;
> -
> -		}
> -
> +		error = kvp_process_ip_address(curp->ifa_addr,
> +						curp->ifa_addr->sa_family,
> +						buffer,
> +						length, &offset);
> +		if (error)
> +			goto getaddr_done;
>  
>  		curp = curp->ifa_next;
>  	}

-- 
Ben Hutchings
I say we take off; nuke the site from orbit.  It's the only way to be sure.

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