[PATCH v2 6/6] udhcpc6: Set -x options in request

Denys Vlasenko vda.linux at googlemail.com
Mon May 14 09:13:27 UTC 2018


Applied with some edits.
Please try current git.

On Mon, May 14, 2018 at 6:29 AM, Samuel Mendoza-Jonas
<sam at mendozajonas.com> wrote:
> Signed-off-by: Samuel Mendoza-Jonas <sam at mendozajonas.com>
> ---
>  networking/udhcp/common.c   | 19 +++++++++++++++----
>  networking/udhcp/common.h   |  4 ++++
>  networking/udhcp/d6_dhcpc.c | 10 +++++++++-
>  3 files changed, 28 insertions(+), 5 deletions(-)
>
> diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
> index bc4606293..7e4b71390 100644
> --- a/networking/udhcp/common.c
> +++ b/networking/udhcp/common.c
> @@ -411,10 +411,21 @@ static NOINLINE void attach_option(
>                 /* make a new option */
>                 log2("attaching option %02x to list", optflag->code);
>                 new = xmalloc(sizeof(*new));
> -               new->data = xmalloc(length + OPT_DATA);
> -               new->data[OPT_CODE] = optflag->code;
> -               new->data[OPT_LEN] = length;
> -               memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
> +               if (addr_type == CLIENT_CONFIG_DHCPV6) {
> +                       new->data = xmalloc(length + D6_OPT_DATA);
> +                       new->data[D6_OPT_CODE] = optflag->code >> 8;
> +                       new->data[D6_OPT_CODE + 1] = optflag->code & 0xff;
> +                       new->data[D6_OPT_LEN] = length >> 8;
> +                       new->data[D6_OPT_LEN + 1] = length & 0xff;
> +                       memcpy(new->data + D6_OPT_DATA, (allocated ? allocated : buffer),
> +                                       length);
> +               } else {
> +                       new->data = xmalloc(length + OPT_DATA);
> +                       new->data[OPT_CODE] = optflag->code;
> +                       new->data[OPT_LEN] = length;
> +                       memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer),
> +                                       length);
> +               }
>
>                 curr = opt_list;
>                 while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
> diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
> index e8c3dc2af..15499197c 100644
> --- a/networking/udhcp/common.h
> +++ b/networking/udhcp/common.h
> @@ -164,6 +164,10 @@ enum {
>  #define OPT_CODE                0
>  #define OPT_LEN                 1
>  #define OPT_DATA                2
> +/* Offsets in option byte sequence for DHCPv6 */
> +#define D6_OPT_CODE                            0
> +#define D6_OPT_LEN                             2
> +#define D6_OPT_DATA                            4
>  /* Bits in "overload" option */
>  #define OPTION_FIELD            0
>  #define FILE_FIELD              1
> diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
> index 26ce147c4..8bdff6e10 100644
> --- a/networking/udhcp/d6_dhcpc.c
> +++ b/networking/udhcp/d6_dhcpc.c
> @@ -486,8 +486,11 @@ static uint8_t *init_d6_packet(struct d6_packet *packet, char type, uint32_t xid
>
>  static uint8_t *add_d6_client_options(uint8_t *ptr)
>  {
> +       struct option_set *curr;
>         uint8_t *start = ptr;
>         unsigned option;
> +       uint16_t len;
> +
>
>         ptr += 4;
>         for (option = 1; option < 256; option++) {
> @@ -510,7 +513,12 @@ static uint8_t *add_d6_client_options(uint8_t *ptr)
>         ptr = mempcpy(ptr, &opt_fqdn_req, sizeof(opt_fqdn_req));
>  #endif
>         /* Add -x options if any */
> -       //...
> +       curr = client_config.options;
> +       while (curr) {
> +               len = curr->data[D6_OPT_LEN] << 8 | (curr->data[D6_OPT_LEN + 1] & 0xff);
> +               ptr = mempcpy(ptr, curr->data, D6_OPT_DATA + len);
> +               curr = curr->next;
> +       }
>
>         return ptr;
>  }
> --
> 2.17.0
>
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