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mirror of https://git.kernel.org/pub/scm/network/wireless/iwd.git synced 2024-10-04 02:18:49 +02:00

resolve: Refactor resolve module

Resolve module does not currently track any state that has been set on
a per ifindex basis.  This was okay while the set of information we
supported was quite small.  However, with dhcpv6 support being prepared,
a more flexible framework is needed.

Change the resolve API to allocate and return an instance for a given
ifindex that has the ability to track information that was provided.
This commit is contained in:
Denis Kenzior 2020-08-21 14:50:44 -05:00
parent ac5ddda56f
commit e58a818ce9
3 changed files with 198 additions and 150 deletions

View File

@ -53,6 +53,8 @@ struct netconfig {
netconfig_notify_func_t notify;
void *user_data;
struct resolve *resolve;
};
struct netconfig_ifaddr {
@ -776,7 +778,7 @@ static void netconfig_ipv4_ifaddr_add_cmd_cb(int error, uint16_t type,
goto domain_name;
}
resolve_add_dns(netconfig->ifindex, ifaddr->family, dns);
resolve_add_dns(netconfig->resolve, ifaddr->family, dns);
l_strv_free(dns);
domain_name:
@ -785,7 +787,7 @@ domain_name:
if (!domain_name)
goto done;
resolve_add_domain_name(netconfig->ifindex, domain_name);
resolve_add_domain_name(netconfig->resolve, domain_name);
l_free(domain_name);
done:
@ -846,7 +848,7 @@ static void netconfig_ipv6_ifaddr_add_cmd_cb(int error, uint16_t type,
return;
}
resolve_add_dns(netconfig->ifindex, AF_INET6, dns);
resolve_add_dns(netconfig->resolve, AF_INET6, dns);
l_strv_free(dns);
}
@ -1144,7 +1146,7 @@ bool netconfig_reset(struct netconfig *netconfig)
netconfig_ipv6_select_and_uninstall(netconfig);
netconfig->rtm_v6_protocol = 0;
resolve_remove(netconfig->ifindex);
resolve_revert(netconfig->resolve);
return true;
}
@ -1179,6 +1181,7 @@ struct netconfig *netconfig_new(uint32_t ifindex)
netconfig = l_new(struct netconfig, 1);
netconfig->ifindex = ifindex;
netconfig->ifaddr_list = l_queue_new();
netconfig->resolve = resolve_new(ifindex);
netconfig_ipv4_dhcp_create(netconfig);
@ -1200,8 +1203,9 @@ void netconfig_destroy(struct netconfig *netconfig)
netconfig_ipv4_select_and_uninstall(netconfig);
if (netconfig->rtm_protocol || netconfig->rtm_v6_protocol)
resolve_remove(netconfig->ifindex);
resolve_revert(netconfig->resolve);
resolve_free(netconfig->resolve);
netconfig_free(netconfig);
}

View File

@ -37,33 +37,83 @@
#include "src/dbus.h"
#include "src/resolve.h"
struct resolve_ops {
void (*add_dns)(struct resolve *resolve,
uint8_t type, char **dns_list);
void (*add_domain_name)(struct resolve *resolve,
const char *domain_name);
void (*revert)(struct resolve *resolve);
void (*destroy)(struct resolve *resolve);
};
struct resolve {
const struct resolve_ops *ops;
uint32_t ifindex;
};
static inline void _resolve_init(struct resolve *resolve, uint32_t ifindex,
const struct resolve_ops *ops)
{
resolve->ifindex = ifindex;
resolve->ops = ops;
}
void resolve_add_dns(struct resolve *resolve, uint8_t type, char **dns_list)
{
if (!dns_list || !*dns_list)
return;
if (!resolve->ops->add_dns)
return;
resolve->ops->add_dns(resolve, type, dns_list);
}
void resolve_add_domain_name(struct resolve *resolve, const char *domain_name)
{
if (!domain_name)
return;
if (!resolve->ops->add_domain_name)
return;
resolve->ops->add_domain_name(resolve, domain_name);
}
void resolve_revert(struct resolve *resolve)
{
if (!resolve->ops->revert)
return;
resolve->ops->revert(resolve);
}
void resolve_free(struct resolve *resolve)
{
resolve->ops->destroy(resolve);
}
struct resolve_method_ops {
void *(*init)(void);
void (*exit)(void *data);
void (*add_dns)(uint32_t ifindex, uint8_t type, char **dns_list,
void *data);
void (*add_domain_name)(uint32_t ifindex, const char *domain_name,
void *data);
void (*remove)(uint32_t ifindex, void *data);
int (*init)(void);
void (*exit)(void);
struct resolve *(*alloc)(uint32_t ifindex);
};
struct resolve_method {
void *data;
const struct resolve_method_ops *ops;
};
static struct resolve_method method;
static char *resolvconf_path;
#define SYSTEMD_RESOLVED_SERVICE "org.freedesktop.resolve1"
#define SYSTEMD_RESOLVED_MANAGER_PATH "/org/freedesktop/resolve1"
#define SYSTEMD_RESOLVED_MANAGER_INTERFACE "org.freedesktop.resolve1.Manager"
struct systemd_state {
struct systemd_method_state {
uint32_t service_watch;
bool is_ready:1;
};
struct systemd_method_state systemd_state;
struct systemd {
struct resolve super;
};
static void systemd_link_dns_reply(struct l_dbus_message *message,
void *user_data)
{
@ -119,24 +169,18 @@ static bool systemd_builder_add_dns(struct l_dbus_message_builder *builder,
return true;
}
static void resolve_systemd_add_dns(uint32_t ifindex, uint8_t type,
char **dns_list, void *data)
static void resolve_systemd_add_dns(struct resolve *resolve,
uint8_t type, char **dns_list)
{
struct systemd_state *state = data;
struct l_dbus_message_builder *builder;
struct l_dbus_message *message;
l_debug("ifindex: %u", ifindex);
if (!state->is_ready) {
l_error("resolve-systemd: Failed to add DNS entries. "
"Is 'systemd-resolved' service running?");
l_debug("ifindex: %u", resolve->ifindex);
if (L_WARN_ON(!systemd_state.is_ready))
return;
}
message =
l_dbus_message_new_method_call(dbus_get_bus(),
message = l_dbus_message_new_method_call(dbus_get_bus(),
SYSTEMD_RESOLVED_SERVICE,
SYSTEMD_RESOLVED_MANAGER_PATH,
SYSTEMD_RESOLVED_MANAGER_INTERFACE,
@ -151,7 +195,7 @@ static void resolve_systemd_add_dns(uint32_t ifindex, uint8_t type,
return;
}
l_dbus_message_builder_append_basic(builder, 'i', &ifindex);
l_dbus_message_builder_append_basic(builder, 'i', &resolve->ifindex);
l_dbus_message_builder_enter_array(builder, "(iay)");
@ -176,7 +220,7 @@ static void resolve_systemd_add_dns(uint32_t ifindex, uint8_t type,
l_dbus_message_builder_destroy(builder);
l_dbus_send_with_reply(dbus_get_bus(), message, systemd_link_dns_reply,
state, NULL);
NULL, NULL);
}
static void systemd_link_add_domains_reply(struct l_dbus_message *message,
@ -194,24 +238,17 @@ static void systemd_link_add_domains_reply(struct l_dbus_message *message,
name, text);
}
static void resolve_systemd_add_domain_name(uint32_t ifindex,
const char *domain_name,
void *data)
static void resolve_systemd_add_domain_name(struct resolve *resolve,
const char *domain_name)
{
struct systemd_state *state = data;
struct l_dbus_message *message;
l_debug("ifindex: %u", ifindex);
if (!state->is_ready) {
l_error("resolve-systemd: Failed to add domain name. "
"Is 'systemd-resolved' service running?");
l_debug("ifindex: %u", resolve->ifindex);
if (L_WARN_ON(!systemd_state.is_ready))
return;
}
message =
l_dbus_message_new_method_call(dbus_get_bus(),
message = l_dbus_message_new_method_call(dbus_get_bus(),
SYSTEMD_RESOLVED_SERVICE,
SYSTEMD_RESOLVED_MANAGER_PATH,
SYSTEMD_RESOLVED_MANAGER_INTERFACE,
@ -220,29 +257,23 @@ static void resolve_systemd_add_domain_name(uint32_t ifindex,
if (!message)
return;
l_dbus_message_set_arguments(message, "ia(sb)", ifindex,
l_dbus_message_set_arguments(message, "ia(sb)", resolve->ifindex,
1, domain_name, false);
l_dbus_send_with_reply(dbus_get_bus(), message,
systemd_link_add_domains_reply, state, NULL);
systemd_link_add_domains_reply, NULL, NULL);
}
static void resolve_systemd_remove(uint32_t ifindex, void *data)
static void resolve_systemd_revert(struct resolve *resolve)
{
struct systemd_state *state = data;
struct l_dbus_message *message;
l_debug("ifindex: %u", ifindex);
if (!state->is_ready) {
l_error("resolve-systemd: Failed to remove DNS entries. "
"Is 'systemd-resolved' service running?");
l_debug("ifindex: %u", resolve->ifindex);
if (L_WARN_ON(!systemd_state.is_ready))
return;
}
message =
l_dbus_message_new_method_call(dbus_get_bus(),
message = l_dbus_message_new_method_call(dbus_get_bus(),
SYSTEMD_RESOLVED_SERVICE,
SYSTEMD_RESOLVED_MANAGER_PATH,
SYSTEMD_RESOLVED_MANAGER_INTERFACE,
@ -250,73 +281,88 @@ static void resolve_systemd_remove(uint32_t ifindex, void *data)
if (!message)
return;
l_dbus_message_set_arguments(message, "i", ifindex);
l_dbus_message_set_arguments(message, "i", resolve->ifindex);
l_dbus_send_with_reply(dbus_get_bus(), message, systemd_link_dns_reply,
state, NULL);
NULL, NULL);
}
static void resolve_systemd_destroy(struct resolve *resolve)
{
struct systemd *sd = l_container_of(resolve, struct systemd, super);
l_free(sd);
}
static const struct resolve_ops systemd_ops = {
.add_dns = resolve_systemd_add_dns,
.add_domain_name = resolve_systemd_add_domain_name,
.revert = resolve_systemd_revert,
.destroy = resolve_systemd_destroy,
};
static void systemd_appeared(struct l_dbus *dbus, void *user_data)
{
struct systemd_state *state = user_data;
state->is_ready = true;
systemd_state.is_ready = true;
}
static void systemd_disappeared(struct l_dbus *dbus, void *user_data)
{
struct systemd_state *state = user_data;
state->is_ready = false;
systemd_state.is_ready = false;
}
static void *resolve_systemd_init(void)
static int resolve_systemd_init(void)
{
struct systemd_state *state;
state = l_new(struct systemd_state, 1);
state->service_watch =
l_dbus_add_service_watch(dbus_get_bus(),
systemd_state.service_watch =
l_dbus_add_service_watch(dbus_get_bus(),
SYSTEMD_RESOLVED_SERVICE,
systemd_appeared,
systemd_disappeared,
state, NULL);
NULL, NULL);
return state;
return 0;
}
static void resolve_systemd_exit(void *data)
static void resolve_systemd_exit(void)
{
struct systemd_state *state = data;
l_dbus_remove_watch(dbus_get_bus(), state->service_watch);
l_free(state);
l_dbus_remove_watch(dbus_get_bus(), systemd_state.service_watch);
memset(&systemd_state, 0, sizeof(systemd_state));
}
static const struct resolve_method_ops resolve_method_systemd = {
static struct resolve *resolve_systemd_alloc(uint32_t ifindex)
{
struct systemd *sd = l_new(struct systemd, 1);
_resolve_init(&sd->super, ifindex, &systemd_ops);
return &sd->super;
}
static const struct resolve_method_ops resolve_method_systemd_ops = {
.init = resolve_systemd_init,
.exit = resolve_systemd_exit,
.add_dns = resolve_systemd_add_dns,
.add_domain_name = resolve_systemd_add_domain_name,
.remove = resolve_systemd_remove,
.alloc = resolve_systemd_alloc,
};
static void resolve_resolvconf_add_dns(uint32_t ifindex, uint8_t type,
char **dns_list, void *data)
char *resolvconf_path;
struct resolvconf {
struct resolve super;
char *ifname;
};
static void resolve_resolvconf_add_dns(struct resolve *resolve,
uint8_t type, char **dns_list)
{
bool *ready = data;
FILE *resolvconf;
struct l_string *content;
int error;
L_AUTO_FREE_VAR(char *, cmd) = NULL;
L_AUTO_FREE_VAR(char *, str) = NULL;
if (!*ready)
if (L_WARN_ON(!resolvconf_path))
return;
cmd = l_strdup_printf("%s -a %u", resolvconf_path, ifindex);
cmd = l_strdup_printf("%s -a %u", resolvconf_path, resolve->ifindex);
if (!(resolvconf = popen(cmd, "w"))) {
l_error("resolve: Failed to start %s (%s).", resolvconf_path,
@ -344,17 +390,16 @@ static void resolve_resolvconf_add_dns(uint32_t ifindex, uint8_t type,
error);
}
static void resolve_resolvconf_remove(uint32_t ifindex, void *data)
static void resolve_resolvconf_revert(struct resolve *resolve)
{
bool *ready = data;
FILE *resolvconf;
int error;
L_AUTO_FREE_VAR(char *, cmd) = NULL;
if (!*ready)
if (L_WARN_ON(!resolvconf_path))
return;
cmd = l_strdup_printf("%s -d %u", resolvconf_path, ifindex);
cmd = l_strdup_printf("%s -d %u", resolvconf_path, resolve->ifindex);
if (!(resolvconf = popen(cmd, "r"))) {
l_error("resolve: Failed to start %s (%s).", resolvconf_path,
@ -371,16 +416,28 @@ static void resolve_resolvconf_remove(uint32_t ifindex, void *data)
error);
}
static void *resolve_resolvconf_init(void)
static void resolve_resolvconf_destroy(struct resolve *resolve)
{
struct resolvconf *rc =
l_container_of(resolve, struct resolvconf, super);
l_free(rc->ifname);
l_free(rc);
}
static struct resolve_ops resolvconf_ops = {
.add_dns = resolve_resolvconf_add_dns,
.revert = resolve_resolvconf_revert,
.destroy = resolve_resolvconf_destroy,
};
static int resolve_resolvconf_init(void)
{
static const char *default_path = "/sbin:/usr/sbin";
bool *ready;
const char *path;
ready = l_new(bool, 1);
*ready = false;
l_debug("Trying to find resolvconf in $PATH");
path = getenv("PATH");
if (path)
resolvconf_path = l_path_find("resolvconf", path, X_OK);
@ -392,66 +449,54 @@ static void *resolve_resolvconf_init(void)
if (!resolvconf_path) {
l_error("No usable resolvconf found on system");
return ready;
return -ENOENT;
}
l_debug("resolvconf found as: %s", resolvconf_path);
*ready = true;
return ready;
return 0;
}
static void resolve_resolvconf_exit(void *data)
static void resolve_resolvconf_exit(void)
{
bool *ready = data;
l_free(resolvconf_path);
resolvconf_path = NULL;
l_free(ready);
}
static const struct resolve_method_ops resolve_method_resolvconf = {
static struct resolve *resolve_resolvconf_alloc(uint32_t ifindex)
{
struct resolvconf *rc = l_new(struct resolvconf, 1);
_resolve_init(&rc->super, ifindex, &resolvconf_ops);
rc->ifname = l_net_get_name(ifindex);
if (!rc->ifname)
rc->ifname = l_strdup_printf("%u", ifindex);
return &rc->super;
}
static const struct resolve_method_ops resolve_method_resolvconf_ops = {
.init = resolve_resolvconf_init,
.exit = resolve_resolvconf_exit,
.add_dns = resolve_resolvconf_add_dns,
.remove = resolve_resolvconf_remove,
.alloc = resolve_resolvconf_alloc,
};
void resolve_add_dns(uint32_t ifindex, uint8_t type, char **dns_list)
static const struct resolve_method_ops *configured_method;
struct resolve *resolve_new(uint32_t ifindex)
{
if (!dns_list || !*dns_list)
return;
if (L_WARN_ON(!configured_method))
return NULL;
if (!method.ops || !method.ops->add_dns)
return;
method.ops->add_dns(ifindex, type, dns_list, method.data);
}
void resolve_add_domain_name(uint32_t ifindex, const char *domain_name)
{
if (!domain_name)
return;
if (!method.ops || !method.ops->add_domain_name)
return;
method.ops->add_domain_name(ifindex, domain_name, method.data);
}
void resolve_remove(uint32_t ifindex)
{
if (!method.ops || !method.ops->remove)
return;
method.ops->remove(ifindex, method.data);
return configured_method->alloc(ifindex);
}
static const struct {
const char *name;
const struct resolve_method_ops *method_ops;
} resolve_method_ops_list[] = {
{ "systemd", &resolve_method_systemd },
{ "resolvconf", &resolve_method_resolvconf },
{ "systemd", &resolve_method_systemd_ops },
{ "resolvconf", &resolve_method_resolvconf_ops },
{ }
};
@ -488,28 +533,25 @@ static int resolve_init(void)
if (strcmp(resolve_method_ops_list[i].name, method_name))
continue;
method.ops = resolve_method_ops_list[i].method_ops;
configured_method = resolve_method_ops_list[i].method_ops;
break;
}
if (!method.ops) {
if (!configured_method) {
l_error("Unknown resolution method: %s", method_name);
return -EINVAL;
}
if (method.ops->init)
method.data = method.ops->init();
return 0;
return configured_method->init();
}
static void resolve_exit(void)
{
if (!method.ops || !method.ops->exit)
if (!configured_method)
return;
method.ops->exit(method.data);
configured_method->exit();
configured_method = NULL;
}
IWD_MODULE(resolve, resolve_init, resolve_exit)

View File

@ -20,6 +20,8 @@
*
*/
void resolve_add_dns(uint32_t ifindex, uint8_t type, char **dns_list);
void resolve_add_domain_name(uint32_t ifindex, const char *domain_name);
void resolve_remove(uint32_t ifindex);
struct resolve *resolve_new(uint32_t ifindex);
void resolve_add_dns(struct resolve *resolve, uint8_t type, char **dns_list);
void resolve_add_domain_name(struct resolve *resolve, const char *domain_name);
void resolve_revert(struct resolve *resolve);
void resolve_free(struct resolve *resolve);