udhcp: optional support for non-standard DHCP ports (+300 bytes when selected)

[oweals/busybox.git] / networking / udhcp / Config.in

diff --git a/networking/udhcp/Config.in b/networking/udhcp/Config.in
index f01340192410ab5a1dcbf9a44d5f2b3396066af4..ff0e4e2ae81663b1bf2fad7c91ba65d1729cb369 100644 (file)
--- a/networking/udhcp/Config.in
+++ b/networking/udhcp/Config.in
@@ -3,7 +3,7 @@
 # see scripts/kbuild/config-language.txt.
 #
 
-config CONFIG_APP_UDHCPD
+config APP_UDHCPD
        bool "udhcp Server (udhcpd)"
        default n
        help
@@ -12,10 +12,19 @@ config CONFIG_APP_UDHCPD
 
          See http://udhcp.busybox.net for further details.
 
-config CONFIG_APP_DUMPLEASES
+config APP_DHCPRELAY
+       bool "dhcprelay"
+       default n
+       depends on APP_UDHCPD
+       help
+         dhcprelay listens for dhcp requests on one or more interfaces
+         and forwards these requests to a different interface or dhcp
+         server.
+
+config APP_DUMPLEASES
        bool "Lease display utility (dumpleases)"
        default n
-       depends on CONFIG_APP_UDHCPD
+       depends on APP_UDHCPD
        help
          dumpleases displays the leases written out by the udhcpd server.
          Lease times are stored in the file by time remaining in lease, or
@@ -23,7 +32,17 @@ config CONFIG_APP_DUMPLEASES
 
          See http://udhcp.busybox.net for further details.
 
-config CONFIG_APP_UDHCPC
+config FEATURE_UDHCPD_WRITE_LEASES_EARLY
+       bool "Rewrite the lease file at every new acknowledge"
+       default n
+       depends on APP_UDHCPD
+       help
+         If selected, udhcpd will write a new file with leases every
+         time a new lease has been accepted, thus eleminating the need
+         to send SIGUSR1 for the initial writing, or updating. Any timed
+         rewriting remains undisturbed
+
+config APP_UDHCPC
        bool "udhcp Client (udhcpc)"
        default n
        help
@@ -35,24 +54,61 @@ config CONFIG_APP_UDHCPC
 
          See http://udhcp.busybox.net for further details.
 
-config CONFIG_FEATURE_UDHCP_SYSLOG
-       bool "Log udhcp messages to syslog"
-       default n
-       depends on CONFIG_APP_UDHCPD || CONFIG_APP_UDHCPC
-       select CONFIG_FEATURE_SYSLOG
+config FEATURE_UDHCPC_ARPING
+       bool "Ask udhcpc to verify that the offered address is free, using arpping"
+       default y
+       depends on APP_UDHCPC
        help
-         If not daemonized, udhcpd prints its messages to stdout/stderr.
-         If this option is selected, it will also log them to syslog.
+         If selected, udhcpc will use arpping to make sure the offered address
+         is really available. The client will DHCPDECLINE the offer if the
+         address is in use, and restart the discover process.
 
-         See http://udhcp.busybox.net for further details.
+config FEATURE_UDHCP_PORT
+       bool "Enable '-P port' option for udhcpd and udhcpc"
+       default n
+       depends on APP_UDHCPD || APP_UDHCPC
+       help
+         At the cost of ~300 bytes, enables -P port option.
+         This feature is typically not needed.
 
-config CONFIG_FEATURE_UDHCP_DEBUG
+config FEATURE_UDHCP_DEBUG
        bool "Compile udhcp with noisy debugging messages"
        default n
-       depends on CONFIG_APP_UDHCPD || CONFIG_APP_UDHCPC
+       depends on APP_UDHCPD || APP_UDHCPC
        help
          If selected, udhcpd will output extra debugging output.  If using
          this option, compile uDHCP with "-g", and do not fork the daemon to
          the background.
 
          See http://udhcp.busybox.net for further details.
+
+config FEATURE_RFC3397
+       bool "Support for RFC3397 domain search (experimental)"
+       default n
+       depends on APP_UDHCPD || APP_UDHCPC
+       help
+         If selected, both client and server will support passing of domain
+         search lists via option 119, specified in RFC3397.
+
+config UDHCPC_SLACK_FOR_BUGGY_SERVERS
+       int "DHCP options slack buffer size"
+       default 80
+       range 0 924
+       depends on APP_UDHCPD || APP_UDHCPC
+       help
+         Some buggy DHCP servers will send DHCP offer packets with option
+         field larger than we expect (which might also be considered a
+         buffer overflow attempt). These packets are normally discarded.
+         If circumstances beyond your control force you to support such
+         servers, this may help. The upper limit (924) makes dhcpc accept
+         even 1500 byte packets (maximum-sized ethernet packets).
+
+         This options does not make dhcp[cd] emit non-standard
+         sized packets.
+
+         Known buggy DHCP servers:
+         3Com OfficeConnect Remote 812 ADSL Router:
+           seems to confuse maximum allowed UDP packet size with
+           maximum size of entire IP packet, and sends packets which are
+           28 bytes too large.
+         Seednet (ISP) VDSL: sends packets 2 bytes too big.