meta-opendreambox/recipes-core/busybox/busybox-1.20.2/0003-udhcpc-calculate-broadcast-address-if-not-given-by-s.patch

   1 From fe285afc183e72301bc823933e8f6059cd29a0b9 Mon Sep 17 00:00:00 2001
   2 From: Andreas Oberritter <obi@opendreambox.org>
   3 Date: Mon, 14 May 2012 17:32:16 +0200
   4 Subject: [PATCH 3/8] udhcpc: calculate broadcast address if not given by
   5  server
   6
   7 * This is more efficient than doing it in the scripts
   8
   9 Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
  10 ---
  11  networking/udhcp/common.h |    2 +-
  12  networking/udhcp/dhcpc.c  |   17 +++++++++++++++++
  13  2 files changed, 18 insertions(+), 1 deletion(-)
  14
  15 diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
  16 index cfd5867..c48dd0a 100644
  17 --- a/networking/udhcp/common.h
  18 +++ b/networking/udhcp/common.h
  19 @@ -126,7 +126,7 @@ enum {
  20  //#define DHCP_ROOT_PATH        0x11
  21  //#define DHCP_IP_TTL           0x17
  22  //#define DHCP_MTU              0x1a
  23 -//#define DHCP_BROADCAST        0x1c
  24 +#define DHCP_BROADCAST          0x1c
  25  //#define DHCP_ROUTES           0x21
  26  //#define DHCP_NIS_DOMAIN       0x28
  27  //#define DHCP_NIS_SERVER       0x29
  28 diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
  29 index ddb328d..5a6c220 100644
  30 --- a/networking/udhcp/dhcpc.c
  31 +++ b/networking/udhcp/dhcpc.c
  32 @@ -533,6 +533,23 @@ static char **fill_envp(struct dhcp_packet *packet)
  33                 i++;
  34         }
  35
  36 +       /* Calculate the broadcast address, if it wasn't provided
  37 +        * by the server, but a subnet mask of /30 or lower was given.
  38 +        */
  39 +       if (udhcp_get_option(packet, DHCP_BROADCAST) == NULL) {
  40 +               temp = udhcp_get_option(packet, DHCP_SUBNET);
  41 +               if (temp) {
  42 +                       uint32_t subnet;
  43 +                       move_from_unaligned32(subnet, temp);
  44 +                       if (ntohl(subnet) <= 0xfffffffc) {
  45 +                               uint32_t broadcast = packet->yiaddr | ~subnet;
  46 +                               *curr = xmalloc(sizeof("broadcast=255.255.255.255"));
  47 +                               sprint_nip(*curr, "broadcast=", (uint8_t *)&broadcast);
  48 +                               putenv(*curr++);
  49 +                       }
  50 +               }
  51 +       }
  52 +
  53         return envp;
  54  }
  55
  56 --
  57 1.7.10.4
  58