udhcpd: remove five more options which do not make sense or not supported

requestip, vendorclass, clientid are client-side variables,
          they do not make sense as udhcpd opts
dhcptype  is the packet type (not interesting, it's always 5)
userclass needs parser support in order to work

function                                             old     new   delta
dhcp_options                                          68      66      -2
read_opt                                             865     859      -6
dhcp_option_strings                                  253     203     -50
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-58)             Total: -58 bytes

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

1 files changed, 20 insertions, 14 deletions

diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c
index 6ab5708e6..c2a230527 100644
--- a/networking/udhcp/options.c
+++ b/networking/udhcp/options.c
@@ -11,7 +11,9 @@
 #include "options.h"
 
 
-/* Supported options are easily added here. See RFC2132 */
+/* Supported options are easily added here.
+ * See RFC2132 for more options.
+ */
 const struct dhcp_option dhcp_options[] = {
         /* flags                                    code */
         { OPTION_IP                   | OPTION_REQ, 0x01 }, /* DHCP_SUBNET        */
@@ -25,7 +27,7 @@ const struct dhcp_option dhcp_options[] = {
         { OPTION_IP | OPTION_LIST                 , 0x09 }, /* DHCP_LPR_SERVER    */
         { OPTION_STRING               | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME     */
         { OPTION_U16                              , 0x0d }, /* DHCP_BOOT_SIZE     */
-        { OPTION_STRING | OPTION_LIST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME   */
+        { OPTION_STRING               | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME   */
         { OPTION_IP                               , 0x10 }, /* DHCP_SWAP_SERVER   */
         { OPTION_STRING                           , 0x11 }, /* DHCP_ROOT_PATH     */
         { OPTION_U8                               , 0x17 }, /* DHCP_IP_TTL        */
@@ -35,16 +37,13 @@ const struct dhcp_option dhcp_options[] = {
         { OPTION_IP | OPTION_LIST                 , 0x29 }, /* nissrv             */
         { OPTION_IP | OPTION_LIST     | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER    */
         { OPTION_IP | OPTION_LIST                 , 0x2c }, /* DHCP_WINS_SERVER   */
-        { OPTION_IP                               , 0x32 }, /* DHCP_REQUESTED_IP  */
         { OPTION_U32                              , 0x33 }, /* DHCP_LEASE_TIME    */
-        { OPTION_U8                               , 0x35 }, /* DHCP_MESSAGE_TYPE  */
         { OPTION_IP                               , 0x36 }, /* DHCP_SERVER_ID     */
         { OPTION_STRING                           , 0x38 }, /* DHCP_MESSAGE       */
-        { OPTION_STRING                           , 0x3C }, /* DHCP_VENDOR        */
-        { OPTION_STRING                           , 0x3D }, /* DHCP_CLIENT_ID     */
         { OPTION_STRING                           , 0x42 }, /* tftp               */
         { OPTION_STRING                           , 0x43 }, /* bootfile           */
-        { OPTION_STRING                           , 0x4D }, /* userclass          */
+//TODO: not a string, but a set of LASCII strings:
+//      { OPTION_STRING                           , 0x4D }, /* userclass          */
 #if ENABLE_FEATURE_UDHCP_RFC3397
         { OPTION_STR1035 | OPTION_LIST            , 0x77 }, /* search             */
 #endif
@@ -54,14 +53,23 @@ const struct dhcp_option dhcp_options[] = {
 
         /* Options below have no match in dhcp_option_strings[],
          * are not passed to dhcpc scripts, and cannot be specified
-         * with "option XXX YYY" syntax in dhcpd config file. */
+         * with "option XXX YYY" syntax in dhcpd config file.
+         * These entries are only used internally by udhcp[cd]
+         * to correctly encode options into packets.
+         */
 
+        { OPTION_IP                               , 0x32 }, /* DHCP_REQUESTED_IP  */
+        { OPTION_U8                               , 0x35 }, /* DHCP_MESSAGE_TYPE  */
         { OPTION_U16                              , 0x39 }, /* DHCP_MAX_SIZE      */
+        { OPTION_STRING                           , 0x3C }, /* DHCP_VENDOR        */
+        { OPTION_STRING                           , 0x3D }, /* DHCP_CLIENT_ID     */
         { 0, 0 } /* zeroed terminating entry */
 };
 
 /* Used for converting options from incoming packets to env variables
- * for udhcpc stript */
+ * for udhcpc stript, and for setting options for udhcpd via
+ * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
+ */
 /* Must match dhcp_options[] order */
 const char dhcp_option_strings[] ALIGN1 =
         "subnet" "\0"      /* DHCP_SUBNET         */
@@ -85,19 +93,17 @@ const char dhcp_option_strings[] ALIGN1 =
         "nissrv" "\0"      /*                     */
         "ntpsrv" "\0"      /* DHCP_NTP_SERVER     */
         "wins" "\0"        /* DHCP_WINS_SERVER    */
-        "requestip" "\0"   /* DHCP_REQUESTED_IP   */
         "lease" "\0"       /* DHCP_LEASE_TIME     */
-        "dhcptype" "\0"    /*                     */
         "serverid" "\0"    /* DHCP_SERVER_ID      */
         "message" "\0"     /* DHCP_MESSAGE        */
-        "vendorclass" "\0" /* DHCP_VENDOR         */
-        "clientid" "\0"    /* DHCP_CLIENT_ID      */
         "tftp" "\0"
         "bootfile" "\0"
-        "userclass" "\0"
+//      "userclass" "\0"
 #if ENABLE_FEATURE_UDHCP_RFC3397
         "search" "\0"
 #endif
+// "staticroutes" is only used to set udhcpc environment, it doesn't work
+// in udhcpd.conf since OPTION_STATIC_ROUTES is not handled yet:
         "staticroutes" "\0" /* DHCP_STATIC_ROUTES  */
         /* MSIE's "Web Proxy Autodiscovery Protocol" support */
         "wpad" "\0"