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lease: add n_dhcp4_client_lease_get_basetime()

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The API already had n_dhcp4_client_lease_get_lifetime(), which is the CLOCK_BOOTTIME
when the lease expires (or ((uint64_t)-1)). But it might be interesting to
know the actual lease duration and when the lease was received (and the
time started to count).

Expose an API for that. With this, one can also calculate the original, exact lease
lifetime, by subtracting n_dhcp4_client_lease_get_basetime() from n_dhcp4_client_lease_get_lifetime(),
while taking care of ((uint64_t)-1).
This commit is contained in:
Thomas Haller 2019-09-23 18:06:00 +02:00
parent d29c8b615a
commit d688019bf8
2 changed files with 13 additions and 0 deletions
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12
shared/n-dhcp4/src/n-dhcp4-c-lease.c
View file

@ -217,6 +217,18 @@ _c_public_ void n_dhcp4_client_lease_get_siaddr(NDhcp4ClientLease *lease, struct
siaddr->s_addr = header->siaddr;
}
/**
* n_dhcp4_client_lease_get_basetime() - get the timestamp when the lease was received.
* @lease: the lease to operate on
* @ns_basetimep: return argument for the base time in nano seconds
*
* Gets the timestamp when the lease was received in CLOCK_BOOTTIME. This
* is also the base timestamp for the expiration of the lifetime and t1/t2.
*/
_c_public_ void n_dhcp4_client_lease_get_basetime(NDhcp4ClientLease *lease, uint64_t *ns_basetimep) {
*ns_basetimep = lease->message->userdata.base_time;
}
/**
* n_dhcp4_client_lease_get_lifetime() - get the lifetime
* @lease: the lease to operate on

1
shared/n-dhcp4/src/n-dhcp4.h
View file

@ -157,6 +157,7 @@ NDhcp4ClientLease *n_dhcp4_client_lease_unref(NDhcp4ClientLease *lease);
void n_dhcp4_client_lease_get_yiaddr(NDhcp4ClientLease *lease, struct in_addr *yiaddr);
void n_dhcp4_client_lease_get_siaddr(NDhcp4ClientLease *lease, struct in_addr *siaddr);
void n_dhcp4_client_lease_get_basetime(NDhcp4ClientLease *lease, uint64_t *ns_basetimep);
void n_dhcp4_client_lease_get_lifetime(NDhcp4ClientLease *lease, uint64_t *ns_lifetimep);
int n_dhcp4_client_lease_query(NDhcp4ClientLease *lease, uint8_t option, uint8_t **datap, size_t *n_datap);