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netutils/dhcpc/dhcpc: add implementation to get renewal (T1) time and

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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>
This commit is contained in:
nuttxs 2025-08-05 18:51:19 +08:00 • committed by Xiang Xiao
parent 8d2a7e32a5
commit 8f3c3c57f9
2 changed files with 37 additions and 1 deletions
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2
include/netutils/dhcpc.h
View file

@ -58,6 +58,8 @@ struct dhcpc_state
struct in_addr dnsaddr;
struct in_addr default_router;
uint32_t lease_time; /* Lease expires in this number of seconds */
uint32_t renewal_time; /* Seconds to transition to RENEW state(T1) */
uint32_t rebinding_time; /* Seconds to transition to REBIND state(T2) */
};
typedef void (*dhcpc_callback_t)(FAR struct dhcpc_state *presult);

36
netutils/dhcpc/dhcpc.c
View file

@ -96,6 +96,8 @@
#define DHCP_OPTION_MSG_TYPE 53
#define DHCP_OPTION_SERVER_ID 54
#define DHCP_OPTION_REQ_LIST 55
#define DHCP_OPTION_T1_TIME 58
#define DHCP_OPTION_T2_TIME 59
#define DHCP_OPTION_CLIENT_ID 61
#define DHCP_OPTION_END 255
@ -340,6 +342,7 @@ static uint8_t dhcpc_parseoptions(FAR struct dhcpc_state *presult,
{
FAR uint8_t *end = optptr + len;
uint8_t type = 0;
uint16_t tmp[2];
while (optptr < end)
{
@ -421,7 +424,6 @@ static uint8_t dhcpc_parseoptions(FAR struct dhcpc_state *presult,
if (optptr + 6 <= end)
{
uint16_t tmp[2];
memcpy(tmp, optptr + 2, 4);
presult->lease_time = ((uint32_t)ntohs(tmp[0])) << 16 |
(uint32_t)ntohs(tmp[1]);
@ -432,6 +434,38 @@ static uint8_t dhcpc_parseoptions(FAR struct dhcpc_state *presult,
}
break;
case DHCP_OPTION_T1_TIME:
/* Get renewal (T1) time (in seconds) in host order */
if (optptr + 6 <= end)
{
memcpy(tmp, optptr + 2, 4);
presult->renewal_time = ((uint32_t)ntohs(tmp[0])) << 16 |
(uint32_t)ntohs(tmp[1]);
}
else
{
nerr("Packet too short (renewal time missing)\n");
}
break;
case DHCP_OPTION_T2_TIME:
/* Get rebinding (T2) time (in seconds) in host order */
if (optptr + 6 <= end)
{
memcpy(tmp, optptr + 2, 4);
presult->rebinding_time = ((uint32_t)ntohs(tmp[0])) << 16 |
(uint32_t)ntohs(tmp[1]);
}
else
{
nerr("Packet too short (rebinding time missing)\n");
}
break;
case DHCP_OPTION_END:
return type;
}