rebinding (T2) time from DHCP packet.
According to RFC 2131, T1 and T2 times play a critical role in lease
management in DHCP clients.
Signed-off-by: nuttxs <zhaoqing.zhang@sony.com>
DHCPRELEASE, According to RFC 2131 section 3.1, DHCPRELEASE is
used by a client to relinquish a network address and cancel any
remaining lease time
Signed-off-by: nuttxs <zhaoqing.zhang@sony.com>
Socket binded to INADDR_ANY is not intended to receive unicast traffic before being fully configured, at least dhclient configured with socket-only won't do so on Linux and BSDs (https://github.com/isc-projects/dhcp/blob/v4_4_3/common/socket.c#L1201).
We can sometimes receive unicast traffic before being fully configured, it's good, but not always, so we need to set the broadcast flag under some situations.
Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
Issue:
DHCP server will send DHCP offer/ack via broadcast packet if broadcast
flag is enabled in DHCP discover/request.
There's no retransmition mechanism for broadcast frame in 802.11 MAC
layer, thus transmit fail rate might be very high. This will increase DHCP fail rate.
Solution:
Disable broadcast flag by default
Signed-off-by: liangchaozhong <liangchaozhong@xiaomi.com>
A return code of EINTR is perfectly normal, and isn't an error as such.
It's an indication that your program may need to do something because
a signal occurred, but if not, should re-call recv().
Signed-off-by: chao an <anchao@xiaomi.com>
rename the UDP_BINDTODEVICE to SO_BINDTODEVICE to follow the linux
style to be compatible with non-UDP protocol binding requirements
Signed-off-by: chao.an <anchao@xiaomi.com>
NETUTILS_DHCPC_RECV_TIMEOUT -> NETUTILS_DHCPC_RECV_TIMEOUT_MS
Recently its unit has been changed from second to millisecond. [1]
Using the same Kconfig name for a different meaning is a pitfall
for an upgrade. I was using 3ms timeout because of this.
This commit renames it so that at least the default value
is used for a careless user like me.
[1]
```
commit 8fd4b6105b
Author: zrrong <zrrong@bouffalolab.com>
Date: Fri May 27 11:35:23 2022 +0800
netutils/dhcpc: Change the timeout unit to milliseconds
```
The logic changes are as follows:
1、Loop sending the DISCOVER up to CONFIG_NETUTILS_DHCPC_RETRIES times
and exit if failure
2、Loop sending the REQUEST up to CONFIG_NETUTILS_DHCPC_RETRIES times
and exit if failure
Signed-off-by: songlinzhang <songlinzhang@xiaomi.com>
- check for minimum packet length (44 bytes, which includes the fields we
read next)
- pass the correct remaining buffer length to dhcpc_parseoptions()
- dhcpc_parseoptions(): ensure we never read past the end of the buffer
Gregory Nutt is the copyright holder for those files and he has submitted the
SGA as a result we can migrate the licenses to Apache.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
Summary:
- This commit fixes the renew command with the usrsock
Impact:
- None
Testing:
- Tested with spresense:wifi and esp32-devkitc:wapi
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
Summary:
- dhcpc now uses gethostname() but the hostname might be empty
- This commit fixes this issue
Impact:
- All use cases which use dhcpc
Testing:
- Tested with spresense:wifi
Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
