...and we did not error-check it, and this is the only use of it:
function old new delta
inet_addr 37 - -37
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Even though it is _meant to be_ an IP address, in the wild servers sometimes
give bogus server ids, like 1.1.1.1
function old new delta
udhcpc_main 2551 2542 -9
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
"-x vendor:VENDOR" will not be a trivial replacement of it:
(1) by default, we do send a vendor string ("udhcp BB_VER"),
will need code to preserve the default.
(2) -V '' currently disables vendor string. -x vendor:''
would not easily achieve that: it adds no option at all
(string options can't be empty), and default (1) would trigger.
To avoid that, we will need yet another hack to detect
-x vendor:'' and interpret that as "no vendor string at all".
IOW: removing -V is likely to increase code size, not decrease.
function old new delta
udhcpc_main 2563 2555 -8
.rodata 103251 103198 -53
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-61) Total: -61 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Even following current Internet standards, it can be perfectly
legitimate to issue IPv4 addresses that end in .0 or .255 via DHCP --
this can happen whenever the network is larger than /8. For example,
10.3.4.0 and 10.3.4.255 are legitimate host addresses in 10/8 or 10.3/16.
(We also want to be able to issue .0 addresses in smaller networks
following our proposed kernel patch and standards changes.)
This behavior is already fully controllable by the user, simply by
setting start_ip and end_ip correctly. Users who don't want to issue
.0 or .255 should set start_ip greater than .0 or end_ip less than .255
and udhcpd will already respect these bounds. (This is also the case
for other DHCP servers -- the recommended example configurations will
default to a lower bound starting with .1 or some other value, which is
typically appropriate, but the user is still allowed to change this to
.0 -- or to a range that overlaps a .0 or .255 address -- if so desired.)
Signed-off-by: Seth David Schoen <schoen@loyalty.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This restores old behavior where we slept for 1/2 of lease, then tried renewing,
thel slept for 1/4 and tried again, etc. But now we will NOT be listening to
all packets for 1/2 of lease time, processing (rejecting) everyone else's
DHCP traffic.
We'll go back to bound state, where we have no listening socket at all.
function old new delta
udhcpc6_main 2600 2655 +55
udhcpc_main 2608 2625 +17
.rodata 103250 103249 -1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 72/-1) Total: 71 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
client_data.vendorclass, .hostname and .fqdn probably need the same treatment:
just insert them into the list of -x opts, get rid of
if (client_data.vendorclass)
udhcp_add_binary_option(packet, client_data.vendorclass);
if (client_data.hostname)
udhcp_add_binary_option(packet, client_data.hostname);
if (client_data.fqdn)
udhcp_add_binary_option(packet, client_data.fqdn);
function old new delta
udhcp_insert_new_option - 166 +166
perform_release 171 207 +36
perform_d6_release 227 259 +32
udhcpc6_main 2558 2580 +22
init_d6_packet 103 84 -19
udhcpc_main 2585 2564 -21
attach_option 397 253 -144
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 3/3 up/down: 256/-184) Total: 72 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
As reported in bug 13776, before this fix the renew never times out.
function old new delta
udhcpc_main 2541 2585 +44
udhcpc6_main 2567 2558 -9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 44/-9) Total: 35 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This allows to fix a problem that we wait for renew replies
for up to half the lease (!!!) if they never come.
Make it so that lease of 60 seconds is not "rounded up" to 120 seconds -
set lower "sanity limit" to 30 seconds.
After 3 failed renew attempts, switch to rebind.
After this change, we can have more flexible choice of when to do
the first renew - does not need to be equal to lease / 2.
function old new delta
udhcpc6_main 2568 2576 +8
.rodata 103339 103294 -45
udhcpc_main 2609 2550 -59
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/2 up/down: 8/-104) Total: -96 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Discovered that the DHCP server on a TrendNet router (unknown model)
provides a zero-length option 12 (Host Name) in the DHCP ACK message. This
has the effect of causing udhcpc to drop the rest of the options, including
option 51 (IP Address Lease Time), 3 (Router), and 6 (Domain Name Server),
most importantly leaving the OpenWrt device with no default gateway.
The TrendNet behavior violates RFC 2132, which in Section 3.14 declares that
option 12 has a minimum length of 1 octet. It is perhaps not a cosmic coincidence
that I found this behavior on Pi Day.
This patch allows zero length options without bailing out, by simply skipping them.
function old new delta
udhcp_scan_options 183 172 -11
Signed-off-by: Russell Senior <russell@personaltelco.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
There are cases where binding to source IP and
destination IP is insufficient to guarantee sane
xmit netdev.
One case where this can fail is when
route-matching netdev carrier is down (cable
unplugged, wifi disconnected), or the netdev is
admin down. Then all the IP based bindings (bind()
+ connect()) will seemingly succeed but the actual
packet can go out through a default gw path.
Depending on the network this happens on
it can create issues or false alarms. It can
also leak some subnet info across networks that
shouldn't be routed.
As such better be safe than sorry and bind to a
netdev to be sure it's used for xmit.
function old new delta
udhcp_send_kernel_packet 293 336 +43
send_packet 182 188 +6
bcast_or_ucast 37 43 +6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 55/0) Total: 55 bytes
Signed-off-by: Michal Kazior <michal@plume.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
"error: taking address of packed member of 'struct ip_udp_dhcp_packet'
may result in an unaligned pointer value" here:
udhcp_dump_packet(&packet.data);
and in other places.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
PLATFORM_LINUX is a hidden configuration option which is disabled by
default and enabled at over a hundred locations for features that are
deemed to be Linux specific.
The only effect of PLATFORM_LINUX is to control compilation of
libbb/match_fstype.c. This file is only needed by mount and umount.
Remove all references to PLATFORM_LINUX and compile match_fstype.c
if mount or umount is enabled.
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Duplicate options are currently overridden (only the last option is kept).
This leads to unexpected behavior when using long options.
The patch adds support for long options in compliance with RFC 3396.
Fixes#13136.
function old new delta
udhcp_run_script 601 725 +124
optitem_unset_env_and_free - 38 +38
putenvp 46 59 +13
static.xmalloc_optname_optval 718 717 -1
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/1 up/down: 175/-1) Total: 174 bytes
Signed-off-by: Martin Lewis <martin.lewis.x84@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
dname_dec: now iterates over the packet only once.
convert_dname: remove redundant checks and code shrink.
While testing I've noticed that some of the tests didn't compile
properly, so I fixed them.
function old new delta
dname_dec 286 267 -19
dname_enc 166 143 -23
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-42) Total: -42 bytes
Signed-off-by: Martin Lewis <martin.lewis.x84@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
fill_envp now iterates over the packet only once instead of a few hundred times
using the new option scanner.
function old new delta
udhcp_scan_options - 189 +189
putenvp - 46 +46
init_scan_state - 22 +22
udhcp_get_option 227 104 -123
udhcp_run_script 835 601 -234
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 0/2 up/down: 257/-357) Total: -100 bytes
Signed-off-by: Martin Lewis <martin.lewis.x84@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Added an option scanner to udhcp to enable iteration over packet options.
Signed-off-by: Martin Lewis <martin.lewis.x84@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Incorporated valid_domain_label into good_hostname to simplify the implementation.
function old new delta
static.xmalloc_optname_optval 973 958 -15
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-15) Total: -15 bytes
text data bss dec hex filename
993144 16915 1872 1011931 f70db busybox_old
993129 16915 1872 1011916 f70cc busybox_unstripped
Signed-off-by: Martin Lewis <martin.lewis.x84@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The following caused udhcpc to segfault:
busybox udhcpc -i lo -s /dev/null -x 0x3d:
function old new delta
udhcp_str2optset 629 641 +12
Signed-off-by: Michal Kazior <michal@plume.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
