--- busybox-1.5.0/networking/udhcp/dhcpc.c	2007-03-22 21:21:23.000000000 +0100
+++ busybox-1.5.0_new/networking/udhcp/dhcpc.c	2007-06-02 21:15:34.000000000 +0200
@@ -126,7 +126,7 @@ int udhcpc_main(int argc, char *argv[]);
 int udhcpc_main(int argc, char *argv[])
 {
 	uint8_t *temp, *message;
-	char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t;
+	char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t, *str_O;
 	unsigned long t1 = 0, t2 = 0, xid = 0;
 	unsigned long start = 0, lease = 0;
 	long now;
@@ -160,6 +160,7 @@ int udhcpc_main(int argc, char *argv[])
 		OPT_T = 1 << 15,
 		OPT_t = 1 << 16,
 		OPT_v = 1 << 17,
+		OPT_O = 1 << 18,
 	};
 #if ENABLE_GETOPT_LONG
 	static const struct option arg_options[] = {
@@ -181,6 +182,7 @@ int udhcpc_main(int argc, char *argv[])
 		{ "timeout",    required_argument,      0, 'T' },
 		{ "version",    no_argument,            0, 'v' },
 		{ "retries",    required_argument,      0, 't' },
+		{ "request-option", required_argument,  0, 'O' },
 		{ 0, 0, 0, 0 }
 	};
 #endif
@@ -196,10 +198,10 @@ int udhcpc_main(int argc, char *argv[])
 #if ENABLE_GETOPT_LONG
 	applet_long_options = arg_options;
 #endif
-	opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:v",
+	opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vO:",
 		&str_c, &str_V, &str_h, &str_h, &str_F,
 		&client_config.interface, &client_config.pidfile, &str_r,
-		&client_config.script, &str_T, &str_t
+		&client_config.script, &str_T, &str_t, &str_O
 		);
 
 	if (opt & OPT_c)
@@ -245,6 +247,11 @@ int udhcpc_main(int argc, char *argv[])
 		printf("version %s\n\n", BB_VER);
 		return 0;
 	}
+	if (opt & OPT_O)
+		if (require_option(str_O)) {
+			printf("Option: %s unknown/not-supported\n", str_O);
+			return 1;
+		}
 
 	/* Start the log, sanitize fd's, and write a pid file */
 	udhcp_start_log_and_pid(client_config.pidfile);
--- busybox-1.5.0/networking/udhcp/options.c	2007-03-22 21:21:23.000000000 +0100
+++ busybox-1.5.0_new/networking/udhcp/options.c	2007-06-02 20:42:42.000000000 +0200
@@ -10,7 +10,7 @@
 
 
 /* supported options are easily added here */
-const struct dhcp_option dhcp_options[] = {
+struct dhcp_option dhcp_options[] = {
 	/* name[12]     flags                                   code */
 	{"subnet",      OPTION_IP | OPTION_REQ,                 0x01},
 	{"timezone",    OPTION_S32,                             0x02},
@@ -67,7 +67,18 @@ const unsigned char option_lengths[] = {
 	[OPTION_S32] =     4
 };
 
-
+/* find and mark requested item as required */
+int require_option(char *name)
+{
+	int i;
+	for (i = 0; dhcp_options[i].code; i++)
+		if( strcmp( name, dhcp_options[i].name ) == 0 ){
+			dhcp_options[i].flags |= OPTION_REQ;
+			return 0;
+		}
+	return 1;
+}
+  
 /* get an option with bounds checking (warning, not aligned). */
 uint8_t *get_option(struct dhcpMessage *packet, int code)
 {
--- busybox-1.5.0/networking/udhcp/options.h	2007-03-22 21:21:23.000000000 +0100
+++ busybox-1.5.0_new/networking/udhcp/options.h	2007-06-02 19:51:40.000000000 +0200
@@ -29,9 +29,10 @@ struct dhcp_option {
 	uint8_t code;
 };
 
-extern const struct dhcp_option dhcp_options[];
+extern struct dhcp_option dhcp_options[];
 extern const unsigned char option_lengths[];
 
+int require_option(char *name);
 uint8_t *get_option(struct dhcpMessage *packet, int code);
 int end_option(uint8_t *optionptr);
 int add_option_string(uint8_t *optionptr, uint8_t *string);
--- busybox-1.5.0/include/usage.h	2007-03-22 21:21:35.000000000 +0100
+++ busybox-1.5.0_new/include/usage.h	2007-06-02 20:08:51.000000000 +0200
@@ -3410,7 +3410,7 @@
        "Adjust filesystem options on ext[23] filesystems"
 
 #define udhcpc_trivial_usage \
-       "[-Cfbnqtv] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]\n[-p pidfile] [-r IP] [-s script]"
+       "[-Cfbnqtv] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]\n[-p pidfile] [-r IP] [-s script] [-O dhcp-option]"
 #define udhcpc_full_usage \
        "	-V,--vendorclass=CLASSID	Set vendor class identifier\n" \
        "	-i,--interface=INTERFACE	Interface to use (default: eth0)\n" \
@@ -3426,7 +3426,8 @@
        "	-n,--now	Exit with failure if lease cannot be immediately negotiated\n" \
        "	-q,--quit	Quit after obtaining lease\n" \
        "	-R,--release	Release IP on quit\n" \
-       "	-v,--version	Display version" \
+       "	-v,--version	Display version\n" \
+       "	-O,--request-option=NAME	Request also NAME DHCP-Option" \
 
 #define udhcpd_trivial_usage \
        "[configfile]\n" \