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netconfig: Install\uninstall DNS addresses

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The DNS addresses are installed as a result of a successful
installation of the IP addresses. The DNS lists are fetched
with netconfig_ipv4_get_dns helper function according to the
origin of the installed IP address.
This commit is contained in:
Tim Kourt 2019-07-30 18:16:10 -07:00 committed by Denis Kenzior
parent 372240fe8c
commit a91136d4b9
1 changed files with 94 additions and 3 deletions
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97
src/netconfig.c
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@ -50,7 +50,6 @@ struct netconfig {
};
struct netconfig_ifaddr {
uint8_t proto;
uint8_t family;
uint8_t prefix_len;
char *ip;
@ -205,6 +204,30 @@ static struct netconfig_ifaddr *netconfig_ipv4_get_ifaddr(
return NULL;
}
static char **netconfig_ipv4_get_dns(struct netconfig *netconfig, uint8_t proto)
{
const struct l_dhcp_lease *lease;
const struct l_settings *settings;
switch (proto) {
case RTPROT_STATIC:
settings = netconfig_get_connected_network_settings(netconfig);
if (!settings)
return NULL;
return l_settings_get_string_list(settings, "IPv4", "dns", ' ');
case RTPROT_DHCP:
lease = l_dhcp_client_get_lease(netconfig->dhcp_client);
if (!lease)
return NULL;
return l_dhcp_lease_get_dns(lease);
}
return NULL;
}
static struct netconfig_ifaddr *netconfig_ifaddr_find(
const struct netconfig *netconfig,
uint8_t family, uint8_t prefix_len,
@ -316,6 +339,48 @@ static void netconfig_ifaddr_cmd_cb(int error, uint16_t type,
netconfig_ifaddr_notify(type, data, len, user_data);
}
static void netconfig_ipv4_ifaddr_add_cmd_cb(int error, uint16_t type,
const void *data, uint32_t len,
void *user_data)
{
struct netconfig *netconfig = user_data;
struct netconfig_ifaddr *ifaddr;
char **dns;
if (error && error != -EEXIST) {
l_error("netconfig: Failed to add IP address. "
"Error %d: %s", error, strerror(-error));
return;
}
ifaddr = netconfig_ipv4_get_ifaddr(netconfig,
netconfig->ipv4_is_static ?
RTPROT_STATIC : RTPROT_DHCP);
if (!ifaddr) {
l_error("netconfig: Failed to obtain IP address from %s.",
netconfig->ipv4_is_static ?
"setting file" : "DHCPv4 lease");
return;
}
/* TODO Install the routes */
dns = netconfig_ipv4_get_dns(netconfig, netconfig->ipv4_is_static ?
RTPROT_STATIC : RTPROT_DHCP);
if (!dns) {
l_error("netconfig: Failed to obtain DNS addresses from %s.",
netconfig->ipv4_is_static ?
"setting file" : "DHCPv4 lease");
goto done;
}
resolve_add_dns(netconfig->ifindex, ifaddr->family, dns);
l_strv_free(dns);
done:
netconfig_ifaddr_destroy(ifaddr);
}
static void netconfig_install_address(struct netconfig *netconfig,
struct netconfig_ifaddr *ifaddr)
{
@ -328,7 +393,7 @@ static void netconfig_install_address(struct netconfig *netconfig,
if (rtnl_ifaddr_add(rtnl, netconfig->ifindex,
ifaddr->prefix_len, ifaddr->ip,
ifaddr->broadcast,
netconfig_ifaddr_cmd_cb,
netconfig_ipv4_ifaddr_add_cmd_cb,
netconfig, NULL))
return;
@ -342,6 +407,32 @@ static void netconfig_install_address(struct netconfig *netconfig,
}
}
static void netconfig_ifaddr_del_cmd_cb(int error, uint16_t type,
const void *data, uint32_t len,
void *user_data)
{
struct netconfig *netconfig;
if (error == -ENODEV)
/* The device is unplugged, we are done. */
return;
if (error) {
l_error("netconfig: Failed to delete IP address. "
"Error %d: %s", error, strerror(-error));
return;
}
netconfig = user_data;
/*
* The kernel removes all of the routes associated with the deleted
* IP on its own. There is no need to explicitly remove them.
*/
resolve_remove(netconfig->ifindex);
}
static void netconfig_uninstall_address(struct netconfig *netconfig,
struct netconfig_ifaddr *ifaddr)
{
@ -354,7 +445,7 @@ static void netconfig_uninstall_address(struct netconfig *netconfig,
if (rtnl_ifaddr_delete(rtnl, netconfig->ifindex,
ifaddr->prefix_len, ifaddr->ip,
ifaddr->broadcast,
netconfig_ifaddr_cmd_cb, netconfig,
netconfig_ifaddr_del_cmd_cb, netconfig,
NULL))
return;