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dhcp: nettools: read/write lease files

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Use the same format of systemd-netword, so that we will be compatible
with the leases created/read by the current "internal" plugin.
Note that actually only the leased address is processed when reading a
lease file, so no need to save more than the ip address when saving the
lease.
This commit is contained in:
Francesco Giudici 2019-08-26 18:38:02 +02:00
parent f60a60a0d0
commit 9f89516928
1 changed files with 57 additions and 2 deletions
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59
src/dhcp/nm-dhcp-nettools.c
View file

@ -42,6 +42,7 @@
#include "nm-dhcp-client-logging.h"
#include "n-dhcp4/src/n-dhcp4.h"
#include "systemd/nm-sd-utils-shared.h"
#include "systemd/nm-sd-utils-dhcp.h"
/*****************************************************************************/
@ -63,6 +64,7 @@ typedef struct {
NDhcp4ClientLease *lease;
GIOChannel *channel;
guint event_id;
char *lease_file;
} NMDhcpNettoolsPrivate;
struct _NMDhcpNettools {
@ -873,9 +875,35 @@ lease_to_ip4_config (NMDedupMultiIndex *multi_idx,
/*****************************************************************************/
static void
lease_save (NDhcp4ClientLease *lease, const char *lease_file)
{
struct in_addr a_address;
nm_auto_free_gstring GString *new_contents = NULL;
char sbuf[NM_UTILS_INET_ADDRSTRLEN];
nm_assert (lease);
nm_assert (lease_file);
new_contents = g_string_new ("# This is private data. Do not parse.\n");
n_dhcp4_client_lease_get_yiaddr (lease, &a_address);
if (a_address.s_addr == INADDR_ANY)
return;
g_string_append_printf (new_contents,
"ADDRESS=%s\n", nm_utils_inet4_ntop (a_address.s_addr, sbuf));
g_file_set_contents (lease_file,
new_contents->str,
-1,
NULL);
}
static void
bound4_handle (NMDhcpNettools *self, NDhcp4ClientLease *lease)
{
NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
const char *iface = nm_dhcp_client_get_iface (NM_DHCP_CLIENT (self));
gs_unref_object NMIP4Config *ip4_config = NULL;
gs_unref_hashtable GHashTable *options = NULL;
@ -899,6 +927,7 @@ bound4_handle (NMDhcpNettools *self, NDhcp4ClientLease *lease)
}
nm_dhcp_option_add_requests_to_options (options, _nm_dhcp_option_dhcp4_options);
lease_save (lease, priv->lease_file);
nm_dhcp_client_set_state (NM_DHCP_CLIENT (self),
NM_DHCP_STATE_BOUND,
@ -1120,6 +1149,7 @@ ip4_start (NMDhcpClient *client,
nm_auto (n_dhcp4_client_probe_config_freep) NDhcp4ClientProbeConfig *config = NULL;
NMDhcpNettools *self = NM_DHCP_NETTOOLS (client);
NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE (self);
gs_free char *lease_file = NULL;
struct in_addr last_addr = { 0 };
const char *hostname;
int r, i;
@ -1141,11 +1171,32 @@ ip4_start (NMDhcpClient *client,
*/
n_dhcp4_client_probe_config_set_start_delay (config, 1);
if (last_ip4_address) {
nm_dhcp_utils_get_leasefile_path (AF_INET,
"internal",
nm_dhcp_client_get_iface (client),
nm_dhcp_client_get_uuid (client),
&lease_file);
if (last_ip4_address)
inet_pton (AF_INET, last_ip4_address, &last_addr);
n_dhcp4_client_probe_config_set_requested_ip (config, last_addr);
else {
/*
* TODO: we stick to the systemd-networkd lease file format. Quite easy for now to
* just use the functions in systemd code. Anyway, as in the end we just use the
* ip address from all the options found in the lease, write a function that parses
* the lease file just for the assigned address and returns it in &last_address.
* Then drop reference to systemd-networkd structures and functions.
*/
nm_auto (sd_dhcp_lease_unrefp) sd_dhcp_lease *lease = NULL;
dhcp_lease_load (&lease, lease_file);
if (lease)
sd_dhcp_lease_get_address (lease, &last_addr);
}
if (last_addr.s_addr)
n_dhcp4_client_probe_config_set_requested_ip (config, last_addr);
/* Add requested options */
for (i = 0; _nm_dhcp_option_dhcp4_options[i].name; i++) {
if (_nm_dhcp_option_dhcp4_options[i].include) {
@ -1194,6 +1245,9 @@ ip4_start (NMDhcpClient *client,
}
}
g_free (priv->lease_file);
priv->lease_file = g_steal_pointer (&lease_file);
r = n_dhcp4_client_probe (priv->client, &priv->probe, config);
if (r) {
nm_utils_error_set_errno (error, r, "failed to start DHCP client: %s");
@ -1233,6 +1287,7 @@ dispose (GObject *object)
{
NMDhcpNettoolsPrivate *priv = NM_DHCP_NETTOOLS_GET_PRIVATE ((NMDhcpNettools *) object);
nm_clear_pointer (&priv->lease_file, g_free);
nm_clear_pointer (&priv->channel, g_io_channel_unref);
nm_clear_g_source (&priv->event_id);
nm_clear_pointer (&priv->lease, n_dhcp4_client_lease_unref);