Re: [Qemu-devel] [RFC PATCH 2/6] iscsi: Handle -iscsi user/password in bdrv_parse_filename()

["Daniel P. Berrange" <berrange@redhat.com>]

On Thu, Dec 08, 2016 at 02:23:07PM +0100, Kevin Wolf wrote:
> This splits the logic in the old parse_chap() function into a part that
> parses the -iscsi options into the new driver-specific options, and
> another part that actually applies those options (called apply_chap()
> now).
> 
> Note that this means that username and password specified with -iscsi
> only take effect when a URL is provided. This is intentional, -iscsi is
> a legacy interface only supported for compatibility, new users should
> use the proper driver-specific options.
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>  block/iscsi.c | 72 +++++++++++++++++++++++++++++++----------------------------
>  1 file changed, 38 insertions(+), 34 deletions(-)
> 
> diff --git a/block/iscsi.c b/block/iscsi.c
> index 7a6664e..c5106c1 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -1235,29 +1235,14 @@ retry:
>      return 0;
>  }
>  
> -static void parse_chap(struct iscsi_context *iscsi, const char *target,
> +static void apply_chap(struct iscsi_context *iscsi, QemuOpts *opts,
>                         Error **errp)
>  {
> -    QemuOptsList *list;
> -    QemuOpts *opts;
>      const char *user = NULL;
>      const char *password = NULL;
>      const char *secretid;
>      char *secret = NULL;
>  
> -    list = qemu_find_opts("iscsi");
> -    if (!list) {
> -        return;
> -    }
> -
> -    opts = qemu_opts_find(list, target);
> -    if (opts == NULL) {
> -        opts = QTAILQ_FIRST(&list->head);
> -        if (!opts) {
> -            return;
> -        }
> -    }
> -
>      user = qemu_opt_get(opts, "user");
>      if (!user) {
>          return;
> @@ -1586,6 +1571,35 @@ out:
>      }
>  }
>  
> +static void iscsi_parse_iscsi_option(const char *target, QDict *options)
> +{
> +    QemuOptsList *list;
> +    QemuOpts *opts;
> +    const char *user;
> +
> +    list = qemu_find_opts("iscsi");
> +    if (!list) {
> +        return;
> +    }
> +
> +    opts = qemu_opts_find(list, target);
> +    if (opts == NULL) {
> +        opts = QTAILQ_FIRST(&list->head);
> +        if (!opts) {
> +            return;
> +        }
> +    }
> +
> +    user = qemu_opt_get(opts, "user");
> +    if (user) {
> +        qdict_set_default_str(options, "user", user);
> +        qdict_set_default_str(options, "password",
> +                              qemu_opt_get(opts, "password"));
> +        qdict_set_default_str(options, "password-secret",
> +                              qemu_opt_get(opts, "password-secret"));

This core dumps if you set '-iscsi user=foo' but don't set password
or password-secret

#0  0x00007fffda7e2046 in strlen () at /lib64/libc.so.6
#1  0x0000555555b012f9 in qstring_from_str (str=str@entry=0x0) at qobject/qstring.c:66
#2  0x0000555555b02148 in qdict_set_default_str (dst=dst@entry=0x5555566ea7d0, key=key@entry=0x555555b2238b "password", val=0x0) at qobject/qdict.c:490
#3  0x0000555555ab515f in iscsi_parse_iscsi_option (options=0x5555566ea7d0, target=0x5555566f0eb0 "iqn.2004-04.fedora:fedora25:iscsi.kvm") at block/iscsi.c:1545
#4  0x0000555555ab515f in iscsi_parse_filename (filename=<optimized out>, options=0x5555566ea7d0, errp=<optimized out>) at block/iscsi.c:1610


Regards,
Daniel
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