FTL/src/dnsmasq/ubus.c

387 lines
10 KiB
C

/* dnsmasq is Copyright (c) 2000-2024 Simon Kelley
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dnsmasq.h"
#ifdef HAVE_UBUS
#include <libubus.h>
static struct blob_buf b;
static int error_logged = 0;
static int ubus_handle_metrics(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg);
#ifdef HAVE_CONNTRACK
enum {
SET_CONNMARK_ALLOWLIST_MARK,
SET_CONNMARK_ALLOWLIST_MASK,
SET_CONNMARK_ALLOWLIST_PATTERNS
};
static const struct blobmsg_policy set_connmark_allowlist_policy[] = {
[SET_CONNMARK_ALLOWLIST_MARK] = {
.name = "mark",
.type = BLOBMSG_TYPE_INT32
},
[SET_CONNMARK_ALLOWLIST_MASK] = {
.name = "mask",
.type = BLOBMSG_TYPE_INT32
},
[SET_CONNMARK_ALLOWLIST_PATTERNS] = {
.name = "patterns",
.type = BLOBMSG_TYPE_ARRAY
}
};
static int ubus_handle_set_connmark_allowlist(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg);
#endif
static void ubus_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj);
static const struct ubus_method ubus_object_methods[] = {
UBUS_METHOD_NOARG("metrics", ubus_handle_metrics),
#ifdef HAVE_CONNTRACK
UBUS_METHOD("set_connmark_allowlist", ubus_handle_set_connmark_allowlist, set_connmark_allowlist_policy),
#endif
};
static struct ubus_object_type ubus_object_type =
UBUS_OBJECT_TYPE("dnsmasq", ubus_object_methods);
static struct ubus_object ubus_object = {
.name = NULL,
.type = &ubus_object_type,
.methods = ubus_object_methods,
.n_methods = ARRAY_SIZE(ubus_object_methods),
.subscribe_cb = ubus_subscribe_cb,
};
static void ubus_subscribe_cb(struct ubus_context *ctx, struct ubus_object *obj)
{
(void)ctx;
my_syslog(LOG_DEBUG, _("UBus subscription callback: %s subscriber(s)"), obj->has_subscribers ? "1" : "0");
}
static void ubus_destroy(struct ubus_context *ubus)
{
ubus_free(ubus);
daemon->ubus = NULL;
/* Forces re-initialization when we're reusing the same definitions later on. */
ubus_object.id = 0;
ubus_object_type.id = 0;
}
static void ubus_disconnect_cb(struct ubus_context *ubus)
{
int ret;
ret = ubus_reconnect(ubus, NULL);
if (ret)
{
my_syslog(LOG_ERR, _("Cannot reconnect to UBus: %s"), ubus_strerror(ret));
ubus_destroy(ubus);
}
}
char *ubus_init()
{
struct ubus_context *ubus = NULL;
int ret = 0;
if (!(ubus = ubus_connect(NULL)))
return NULL;
ubus_object.name = daemon->ubus_name;
ret = ubus_add_object(ubus, &ubus_object);
if (ret)
{
ubus_destroy(ubus);
return (char *)ubus_strerror(ret);
}
ubus->connection_lost = ubus_disconnect_cb;
daemon->ubus = ubus;
error_logged = 0;
return NULL;
}
void set_ubus_listeners()
{
struct ubus_context *ubus = (struct ubus_context *)daemon->ubus;
if (!ubus)
{
if (!error_logged)
{
my_syslog(LOG_ERR, _("Cannot set UBus listeners: no connection"));
error_logged = 1;
}
return;
}
error_logged = 0;
poll_listen(ubus->sock.fd, POLLIN);
poll_listen(ubus->sock.fd, POLLERR);
poll_listen(ubus->sock.fd, POLLHUP);
}
void check_ubus_listeners()
{
struct ubus_context *ubus = (struct ubus_context *)daemon->ubus;
if (!ubus)
{
if (!error_logged)
{
my_syslog(LOG_ERR, _("Cannot poll UBus listeners: no connection"));
error_logged = 1;
}
return;
}
error_logged = 0;
if (poll_check(ubus->sock.fd, POLLIN))
ubus_handle_event(ubus);
if (poll_check(ubus->sock.fd, POLLHUP | POLLERR))
{
my_syslog(LOG_INFO, _("Disconnecting from UBus"));
ubus_destroy(ubus);
}
}
#define CHECK(stmt) \
do { \
int e = (stmt); \
if (e) \
{ \
my_syslog(LOG_ERR, _("UBus command failed: %d (%s)"), e, #stmt); \
return (UBUS_STATUS_UNKNOWN_ERROR); \
} \
} while (0)
static int ubus_handle_metrics(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
int i;
(void)obj;
(void)method;
(void)msg;
CHECK(blob_buf_init(&b, BLOBMSG_TYPE_TABLE));
for (i=0; i < __METRIC_MAX; i++)
CHECK(blobmsg_add_u32(&b, get_metric_name(i), daemon->metrics[i]));
CHECK(ubus_send_reply(ctx, req, b.head));
return UBUS_STATUS_OK;
}
#ifdef HAVE_CONNTRACK
static int ubus_handle_set_connmark_allowlist(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method,
struct blob_attr *msg)
{
const struct blobmsg_policy *policy = set_connmark_allowlist_policy;
size_t policy_len = countof(set_connmark_allowlist_policy);
struct allowlist *allowlists = NULL, **allowlists_pos;
char **patterns = NULL, **patterns_pos;
u32 mark, mask = UINT32_MAX;
size_t num_patterns = 0;
struct blob_attr *tb[policy_len];
struct blob_attr *attr;
if (blobmsg_parse(policy, policy_len, tb, blob_data(msg), blob_len(msg)))
return UBUS_STATUS_INVALID_ARGUMENT;
if (!tb[SET_CONNMARK_ALLOWLIST_MARK])
return UBUS_STATUS_INVALID_ARGUMENT;
mark = blobmsg_get_u32(tb[SET_CONNMARK_ALLOWLIST_MARK]);
if (!mark)
return UBUS_STATUS_INVALID_ARGUMENT;
if (tb[SET_CONNMARK_ALLOWLIST_MASK])
{
mask = blobmsg_get_u32(tb[SET_CONNMARK_ALLOWLIST_MASK]);
if (!mask || (mark & ~mask))
return UBUS_STATUS_INVALID_ARGUMENT;
}
if (tb[SET_CONNMARK_ALLOWLIST_PATTERNS])
{
struct blob_attr *head = blobmsg_data(tb[SET_CONNMARK_ALLOWLIST_PATTERNS]);
size_t len = blobmsg_data_len(tb[SET_CONNMARK_ALLOWLIST_PATTERNS]);
__blob_for_each_attr(attr, head, len)
{
char *pattern;
if (blob_id(attr) != BLOBMSG_TYPE_STRING)
return UBUS_STATUS_INVALID_ARGUMENT;
if (!(pattern = blobmsg_get_string(attr)))
return UBUS_STATUS_INVALID_ARGUMENT;
if (strcmp(pattern, "*") && !is_valid_dns_name_pattern(pattern))
return UBUS_STATUS_INVALID_ARGUMENT;
num_patterns++;
}
}
for (allowlists_pos = &daemon->allowlists; *allowlists_pos; allowlists_pos = &(*allowlists_pos)->next)
if ((*allowlists_pos)->mark == mark && (*allowlists_pos)->mask == mask)
{
struct allowlist *allowlists_next = (*allowlists_pos)->next;
for (patterns_pos = (*allowlists_pos)->patterns; *patterns_pos; patterns_pos++)
{
free(*patterns_pos);
*patterns_pos = NULL;
}
free((*allowlists_pos)->patterns);
(*allowlists_pos)->patterns = NULL;
free(*allowlists_pos);
*allowlists_pos = allowlists_next;
break;
}
if (!num_patterns)
return UBUS_STATUS_OK;
patterns = whine_malloc((num_patterns + 1) * sizeof(char *));
if (!patterns)
goto fail;
patterns_pos = patterns;
if (tb[SET_CONNMARK_ALLOWLIST_PATTERNS])
{
struct blob_attr *head = blobmsg_data(tb[SET_CONNMARK_ALLOWLIST_PATTERNS]);
size_t len = blobmsg_data_len(tb[SET_CONNMARK_ALLOWLIST_PATTERNS]);
__blob_for_each_attr(attr, head, len)
{
char *pattern;
if (!(pattern = blobmsg_get_string(attr)))
goto fail;
if (!(*patterns_pos = whine_malloc(strlen(pattern) + 1)))
goto fail;
strcpy(*patterns_pos++, pattern);
}
}
allowlists = whine_malloc(sizeof(struct allowlist));
if (!allowlists)
goto fail;
memset(allowlists, 0, sizeof(struct allowlist));
allowlists->mark = mark;
allowlists->mask = mask;
allowlists->patterns = patterns;
allowlists->next = daemon->allowlists;
daemon->allowlists = allowlists;
return UBUS_STATUS_OK;
fail:
if (patterns)
{
for (patterns_pos = patterns; *patterns_pos; patterns_pos++)
{
free(*patterns_pos);
*patterns_pos = NULL;
}
free(patterns);
patterns = NULL;
}
if (allowlists)
{
free(allowlists);
allowlists = NULL;
}
return UBUS_STATUS_UNKNOWN_ERROR;
}
#endif
#undef CHECK
#define CHECK(stmt) \
do { \
int e = (stmt); \
if (e) \
{ \
my_syslog(LOG_ERR, _("UBus command failed: %d (%s)"), e, #stmt); \
return; \
} \
} while (0)
void ubus_event_bcast(const char *type, const char *mac, const char *ip, const char *name, const char *interface)
{
struct ubus_context *ubus = (struct ubus_context *)daemon->ubus;
if (!ubus || !ubus_object.has_subscribers)
return;
CHECK(blob_buf_init(&b, BLOBMSG_TYPE_TABLE));
if (mac)
CHECK(blobmsg_add_string(&b, "mac", mac));
if (ip)
CHECK(blobmsg_add_string(&b, "ip", ip));
if (name)
CHECK(blobmsg_add_string(&b, "name", name));
if (interface)
CHECK(blobmsg_add_string(&b, "interface", interface));
CHECK(ubus_notify(ubus, &ubus_object, type, b.head, -1));
}
#ifdef HAVE_CONNTRACK
void ubus_event_bcast_connmark_allowlist_refused(u32 mark, const char *name)
{
struct ubus_context *ubus = (struct ubus_context *)daemon->ubus;
if (!ubus || !ubus_object.has_subscribers)
return;
CHECK(blob_buf_init(&b, 0));
CHECK(blobmsg_add_u32(&b, "mark", mark));
CHECK(blobmsg_add_string(&b, "name", name));
CHECK(ubus_notify(ubus, &ubus_object, "connmark-allowlist.refused", b.head, -1));
}
void ubus_event_bcast_connmark_allowlist_resolved(u32 mark, const char *name, const char *value, u32 ttl)
{
struct ubus_context *ubus = (struct ubus_context *)daemon->ubus;
if (!ubus || !ubus_object.has_subscribers)
return;
CHECK(blob_buf_init(&b, 0));
CHECK(blobmsg_add_u32(&b, "mark", mark));
CHECK(blobmsg_add_string(&b, "name", name));
CHECK(blobmsg_add_string(&b, "value", value));
CHECK(blobmsg_add_u32(&b, "ttl", ttl));
/* Set timeout to allow UBus subscriber to configure firewall rules before returning. */
CHECK(ubus_notify(ubus, &ubus_object, "connmark-allowlist.resolved", b.head, /* timeout: */ 1000));
}
#endif
#undef CHECK
#endif /* HAVE_UBUS */