Re: [PATCH nfs-utils v2 10/12] exportfs: add support for "vsock:" exports(5) syntax

[Steve Dickson <SteveD@RedHat.com>]

On 06/30/2017 09:21 AM, Stefan Hajnoczi wrote:
> Allow exports to be restricted to AF_VSOCK clients:
> 
>   # exportfs vsock:3:/export
> 
> and:
> 
>   # cat /etc/exports
>   /export	vsock:*(rw,no_root_squash,insecure,subtree_check)
Again it would be nice to use hostnames or address types
instead of a qualifier like 'vsock'... But if we do end
up going down this road, this definitely has to be
documented in the man page. 

steved.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  utils/exportfs/exportfs.c | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
> index 3ded733..6bf67f1 100644
> --- a/utils/exportfs/exportfs.c
> +++ b/utils/exportfs/exportfs.c
> @@ -299,6 +299,20 @@ static int exportfs_generic(char *arg, char *options, int verbose)
>  	return 0;
>  }
>  
> +static int exportfs_vsock(char *arg, char *options, int verbose)
> +{
> +	char *path;
> +
> +	if ((path = strchr(arg + strlen("vsock:"), ':')) != NULL)
> +		*path++ = '\0';
> +
> +	if (!path || *path != '/')
> +		return 1;
> +
> +	exportfs_parsed(arg, path, options, verbose);
> +	return 0;
> +}
> +
>  static int exportfs_ipv6(char *arg, char *options, int verbose)
>  {
>  	char *path, *c;
> @@ -332,6 +346,8 @@ exportfs(char *arg, char *options, int verbose)
>  
>  	if (*arg == '[')
>  		failed = exportfs_ipv6(arg, options, verbose);
> +	else if (strncmp(arg, "vsock:", strlen("vsock:")) == 0)
> +		failed = exportfs_vsock(arg, options, verbose);
>  	else
>  		failed = exportfs_generic(arg, options, verbose);
>  	if (failed)
> @@ -412,6 +428,20 @@ static int unexportfs_generic(char *arg, int verbose)
>  	return 0;
>  }
>  
> +static int unexportfs_vsock(char *arg, int verbose)
> +{
> +	char *path;
> +
> +	if ((path = strchr(arg + strlen("vsock:"), ':')) != NULL)
> +		*path++ = '\0';
> +
> +	if (!path || *path != '/')
> +		return 1;
> +
> +	unexportfs_parsed(arg, path, verbose);
> +	return 0;
> +}
> +
>  static int unexportfs_ipv6(char *arg, int verbose)
>  {
>  	char *path, *c;
> @@ -445,6 +475,8 @@ unexportfs(char *arg, int verbose)
>  
>  	if (*arg == '[')
>  		failed = unexportfs_ipv6(arg, verbose);
> +	else if (strncmp(arg, "vsock:", strlen("vsock:")) == 0)
> +		failed = unexportfs_vsock(arg, verbose);
>  	else
>  		failed = unexportfs_generic(arg, verbose);
>  	if (failed)
>