udhcpd: untangle incredibly messy handling of DHCPREQUEST

Also fixes attacks possible via DHCPDECLINE / DHCPRELEASE

function                                             old     new   delta
udhcpd_main                                         1846    1949    +103
send_renew                                           105     142     +37
send_NAK                                              61       -     -61
send_ACK                                             180       -    -180
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 2/0 up/down: 140/-241)         Total: -101 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c
index b4413fa16..400fd2b9b 100644
--- a/networking/udhcp/script.c
+++ b/networking/udhcp/script.c
@@ -64,7 +64,7 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
 
         /* option points to OPT_DATA, need to go back and get OPT_LEN */
         len = option[OPT_LEN - OPT_DATA];
-        type = type_p->flags & TYPE_MASK;
+        type = type_p->flags & OPTION_TYPE_MASK;
         optlen = dhcp_option_lengths[type];
         upper_length = len_of_option_as_string[type] * (len / optlen);