#include "messages.h"
#include "lib/util/tevent_unix.h"
#include "lib/background.h"
+#include "lib/messages_dgm.h"
+#include "lib/util/iov_buf.h"
+#include "lib/util/server_id_db.h"
+#include "lib/messages_dgm_ref.h"
+#include "lib/messages_util.h"
struct messaging_callback {
struct messaging_callback *prev, *next;
- uint32 msg_type;
+ uint32_t msg_type;
void (*fn)(struct messaging_context *msg, void *private_data,
uint32_t msg_type,
struct server_id server_id, DATA_BLOB *data);
void *private_data;
};
+struct messaging_context {
+ struct server_id id;
+ struct tevent_context *event_ctx;
+ struct messaging_callback *callbacks;
+
+ struct tevent_req **new_waiters;
+ unsigned num_new_waiters;
+
+ struct tevent_req **waiters;
+ unsigned num_waiters;
+
+ void *msg_dgm_ref;
+ struct messaging_backend *remote;
+
+ struct server_id_db *names_db;
+};
+
+static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
+ struct messaging_rec *rec);
+
/****************************************************************************
A useful function for testing the message system.
****************************************************************************/
struct server_id src,
DATA_BLOB *data)
{
- const char *msg = "none";
- char *free_me = NULL;
+ struct server_id_buf idbuf;
+
+ DEBUG(1, ("INFO: Received PING message from PID %s [%.*s]\n",
+ server_id_str_buf(src, &idbuf), (int)data->length,
+ data->data ? (char *)data->data : ""));
- if (data->data != NULL) {
- free_me = talloc_strndup(talloc_tos(), (char *)data->data,
- data->length);
- msg = free_me;
- }
- DEBUG(1,("INFO: Received PING message from PID %s [%s]\n",
- procid_str_static(&src), msg));
- TALLOC_FREE(free_me);
messaging_send(msg_ctx, src, MSG_PONG, data);
}
struct msg_all {
struct messaging_context *msg_ctx;
int msg_type;
- uint32 msg_flag;
+ uint32_t msg_flag;
const void *buf;
size_t len;
int n_sent;
(const uint8_t *)msg_all->buf, msg_all->len);
if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
+ struct server_id_buf idbuf;
/*
* If the pid was not found delete the entry from
* serverid.tdb
*/
- DEBUG(2, ("pid %s doesn't exist\n", procid_str_static(id)));
+ DEBUG(2, ("pid %s doesn't exist\n",
+ server_id_str_buf(*id, &idbuf)));
dbwrap_record_delete(rec);
}
return true;
}
+static void messaging_recv_cb(const uint8_t *msg, size_t msg_len,
+ int *fds, size_t num_fds,
+ void *private_data)
+{
+ struct messaging_context *msg_ctx = talloc_get_type_abort(
+ private_data, struct messaging_context);
+ struct server_id_buf idbuf;
+ struct messaging_rec rec;
+ int64_t fds64[MIN(num_fds, INT8_MAX)];
+ size_t i;
+
+ if (msg_len < MESSAGE_HDR_LENGTH) {
+ DEBUG(1, ("message too short: %u\n", (unsigned)msg_len));
+ goto close_fail;
+ }
+
+ if (num_fds > INT8_MAX) {
+ DEBUG(1, ("too many fds: %u\n", (unsigned)num_fds));
+ goto close_fail;
+ }
+
+ /*
+ * "consume" the fds by copying them and setting
+ * the original variable to -1
+ */
+ for (i=0; i < num_fds; i++) {
+ fds64[i] = fds[i];
+ fds[i] = -1;
+ }
+
+ rec = (struct messaging_rec) {
+ .msg_version = MESSAGE_VERSION,
+ .buf.data = discard_const_p(uint8_t, msg) + MESSAGE_HDR_LENGTH,
+ .buf.length = msg_len - MESSAGE_HDR_LENGTH,
+ .num_fds = num_fds,
+ .fds = fds64,
+ };
+
+ message_hdr_get(&rec.msg_type, &rec.src, &rec.dest, msg);
+
+ DEBUG(10, ("%s: Received message 0x%x len %u (num_fds:%u) from %s\n",
+ __func__, (unsigned)rec.msg_type,
+ (unsigned)rec.buf.length,
+ (unsigned)num_fds,
+ server_id_str_buf(rec.src, &idbuf)));
+
+ messaging_dispatch_rec(msg_ctx, &rec);
+ return;
+
+close_fail:
+ for (i=0; i < num_fds; i++) {
+ close(fds[i]);
+ }
+}
+
+static int messaging_context_destructor(struct messaging_context *ctx)
+{
+ unsigned i;
+
+ for (i=0; i<ctx->num_new_waiters; i++) {
+ if (ctx->new_waiters[i] != NULL) {
+ tevent_req_set_cleanup_fn(ctx->new_waiters[i], NULL);
+ ctx->new_waiters[i] = NULL;
+ }
+ }
+ for (i=0; i<ctx->num_waiters; i++) {
+ if (ctx->waiters[i] != NULL) {
+ tevent_req_set_cleanup_fn(ctx->waiters[i], NULL);
+ ctx->waiters[i] = NULL;
+ }
+ }
+
+ return 0;
+}
+
+static const char *private_path(const char *name)
+{
+ return talloc_asprintf(talloc_tos(), "%s/%s", lp_private_dir(), name);
+}
+
struct messaging_context *messaging_init(TALLOC_CTX *mem_ctx,
struct tevent_context *ev)
{
struct messaging_context *ctx;
NTSTATUS status;
+ int ret;
+ const char *lck_path;
+ const char *priv_path;
+ bool ok;
if (!(ctx = talloc_zero(mem_ctx, struct messaging_context))) {
return NULL;
ctx->id = procid_self();
ctx->event_ctx = ev;
- status = messaging_dgm_init(ctx, ctx, &ctx->local);
+ sec_init();
+
+ lck_path = lock_path("msg");
+ if (lck_path == NULL) {
+ TALLOC_FREE(ctx);
+ return NULL;
+ }
+
+ ok = directory_create_or_exist_strict(lck_path, sec_initial_uid(),
+ 0755);
+ if (!ok) {
+ DEBUG(10, ("%s: Could not create lock directory: %s\n",
+ __func__, strerror(errno)));
+ TALLOC_FREE(ctx);
+ return NULL;
+ }
+
+ priv_path = private_path("sock");
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(2, ("messaging_dgm_init failed: %s\n",
- nt_errstr(status)));
+ ok = directory_create_or_exist_strict(priv_path, sec_initial_uid(),
+ 0700);
+ if (!ok) {
+ DEBUG(10, ("%s: Could not create msg directory: %s\n",
+ __func__, strerror(errno)));
TALLOC_FREE(ctx);
return NULL;
}
+ ctx->msg_dgm_ref = messaging_dgm_ref(
+ ctx, ctx->event_ctx, ctx->id.unique_id,
+ priv_path, lck_path, messaging_recv_cb, ctx, &ret);
+
+ if (ctx->msg_dgm_ref == NULL) {
+ DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
+ TALLOC_FREE(ctx);
+ return NULL;
+ }
+
+ talloc_set_destructor(ctx, messaging_context_destructor);
+
if (lp_clustering()) {
status = messaging_ctdbd_init(ctx, ctx, &ctx->remote);
}
ctx->id.vnn = get_my_vnn();
+ ctx->names_db = server_id_db_init(
+ ctx, ctx->id, lp_lock_directory(), 0,
+ TDB_INCOMPATIBLE_HASH|TDB_CLEAR_IF_FIRST);
+ if (ctx->names_db == NULL) {
+ DEBUG(10, ("%s: server_id_db_init failed\n", __func__));
+ TALLOC_FREE(ctx);
+ return NULL;
+ }
+
messaging_register(ctx, NULL, MSG_PING, ping_message);
/* Register some debugging related messages */
NTSTATUS messaging_reinit(struct messaging_context *msg_ctx)
{
NTSTATUS status;
+ int ret;
- TALLOC_FREE(msg_ctx->local);
+ TALLOC_FREE(msg_ctx->msg_dgm_ref);
msg_ctx->id = procid_self();
- status = messaging_dgm_init(msg_ctx, msg_ctx, &msg_ctx->local);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(0, ("messaging_dgm_init failed: %s\n",
- nt_errstr(status)));
- return status;
+ msg_ctx->msg_dgm_ref = messaging_dgm_ref(
+ msg_ctx, msg_ctx->event_ctx, msg_ctx->id.unique_id,
+ private_path("sock"), lock_path("msg"),
+ messaging_recv_cb, msg_ctx, &ret);
+
+ if (msg_ctx->msg_dgm_ref == NULL) {
+ DEBUG(2, ("messaging_dgm_ref failed: %s\n", strerror(ret)));
+ return map_nt_error_from_unix(ret);
}
TALLOC_FREE(msg_ctx->remote);
}
}
+ server_id_db_reinit(msg_ctx->names_db, msg_ctx->id);
+
return NT_STATUS_OK;
}
}
}
-struct messaging_selfsend_state {
- struct messaging_context *msg;
- struct messaging_rec rec;
-};
-
-static void messaging_trigger_self(struct tevent_context *ev,
- struct tevent_immediate *im,
- void *private_data);
-
/*
Send a message to a particular server
*/
struct server_id server, uint32_t msg_type,
const DATA_BLOB *data)
{
- if (server_id_is_disconnected(&server)) {
- return NT_STATUS_INVALID_PARAMETER_MIX;
- }
-
- if (!procid_is_local(&server)) {
- return msg_ctx->remote->send_fn(msg_ctx, server,
- msg_type, data,
- msg_ctx->remote);
- }
-
- if (server_id_equal(&msg_ctx->id, &server)) {
- struct messaging_selfsend_state *state;
- struct tevent_immediate *im;
-
- state = talloc_pooled_object(
- msg_ctx, struct messaging_selfsend_state,
- 1, data->length);
- if (state == NULL) {
- return NT_STATUS_NO_MEMORY;
- }
- state->msg = msg_ctx;
- state->rec.msg_version = MESSAGE_VERSION;
- state->rec.msg_type = msg_type & MSG_TYPE_MASK;
- state->rec.dest = server;
- state->rec.src = msg_ctx->id;
-
- /* Can't fail, it's a pooled_object */
- state->rec.buf = data_blob_talloc(
- state, data->data, data->length);
-
- im = tevent_create_immediate(state);
- if (im == NULL) {
- TALLOC_FREE(state);
- return NT_STATUS_NO_MEMORY;
- }
-
- tevent_schedule_immediate(im, msg_ctx->event_ctx,
- messaging_trigger_self, state);
- return NT_STATUS_OK;
- }
+ struct iovec iov;
- return msg_ctx->local->send_fn(msg_ctx, server, msg_type, data,
- msg_ctx->local);
-}
+ iov.iov_base = data->data;
+ iov.iov_len = data->length;
-static void messaging_trigger_self(struct tevent_context *ev,
- struct tevent_immediate *im,
- void *private_data)
-{
- struct messaging_selfsend_state *state = talloc_get_type_abort(
- private_data, struct messaging_selfsend_state);
- messaging_dispatch_rec(state->msg, &state->rec);
- TALLOC_FREE(state);
+ return messaging_send_iov(msg_ctx, server, msg_type, &iov, 1, NULL, 0);
}
NTSTATUS messaging_send_buf(struct messaging_context *msg_ctx,
return messaging_send(msg_ctx, server, msg_type, &blob);
}
-NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
- struct server_id server, uint32_t msg_type,
- const struct iovec *iov, int iovlen)
+NTSTATUS messaging_send_iov_from(struct messaging_context *msg_ctx,
+ struct server_id src, struct server_id dst,
+ uint32_t msg_type,
+ const struct iovec *iov, int iovlen,
+ const int *fds, size_t num_fds)
{
- uint8_t *buf;
- NTSTATUS status;
+ int ret;
+ uint8_t hdr[MESSAGE_HDR_LENGTH];
+ struct iovec iov2[iovlen+1];
- buf = iov_buf(talloc_tos(), iov, iovlen);
- if (buf == NULL) {
- return NT_STATUS_NO_MEMORY;
+ if (server_id_is_disconnected(&dst)) {
+ return NT_STATUS_INVALID_PARAMETER_MIX;
}
- status = messaging_send_buf(msg_ctx, server, msg_type,
- buf, talloc_get_size(buf));
+ if (num_fds > INT8_MAX) {
+ return NT_STATUS_INVALID_PARAMETER_MIX;
+ }
+
+ if (!procid_is_local(&dst)) {
+ if (num_fds > 0) {
+ return NT_STATUS_NOT_SUPPORTED;
+ }
- TALLOC_FREE(buf);
- return status;
+ ret = msg_ctx->remote->send_fn(src, dst,
+ msg_type, iov, iovlen,
+ NULL, 0,
+ msg_ctx->remote);
+ if (ret != 0) {
+ return map_nt_error_from_unix(ret);
+ }
+ return NT_STATUS_OK;
+ }
+
+ message_hdr_put(hdr, msg_type, src, dst);
+ iov2[0] = (struct iovec){ .iov_base = hdr, .iov_len = sizeof(hdr) };
+ memcpy(&iov2[1], iov, iovlen * sizeof(*iov));
+
+ become_root();
+ ret = messaging_dgm_send(dst.pid, iov2, iovlen+1, fds, num_fds);
+ unbecome_root();
+
+ if (ret != 0) {
+ return map_nt_error_from_unix(ret);
+ }
+ return NT_STATUS_OK;
+}
+
+NTSTATUS messaging_send_iov(struct messaging_context *msg_ctx,
+ struct server_id dst, uint32_t msg_type,
+ const struct iovec *iov, int iovlen,
+ const int *fds, size_t num_fds)
+{
+ return messaging_send_iov_from(msg_ctx, msg_ctx->id, dst, msg_type,
+ iov, iovlen, fds, num_fds);
}
static struct messaging_rec *messaging_rec_dup(TALLOC_CTX *mem_ctx,
struct messaging_rec *rec)
{
struct messaging_rec *result;
+ size_t fds_size = sizeof(int64_t) * rec->num_fds;
- result = talloc_pooled_object(mem_ctx, struct messaging_rec,
- 1, rec->buf.length);
+ result = talloc_pooled_object(mem_ctx, struct messaging_rec, 2,
+ rec->buf.length + fds_size);
if (result == NULL) {
return NULL;
}
result->buf.data = talloc_memdup(result, rec->buf.data,
rec->buf.length);
+
+ result->fds = NULL;
+ if (result->num_fds > 0) {
+ result->fds = talloc_memdup(result, rec->fds, fds_size);
+ }
+
return result;
}
struct messaging_filtered_read_state {
struct tevent_context *ev;
struct messaging_context *msg_ctx;
+ void *tevent_handle;
bool (*filter)(struct messaging_rec *rec, void *private_data);
void *private_data;
state->filter = filter;
state->private_data = private_data;
+ /*
+ * We have to defer the callback here, as we might be called from
+ * within a different tevent_context than state->ev
+ */
+ tevent_req_defer_callback(req, state->ev);
+
+ state->tevent_handle = messaging_dgm_register_tevent_context(
+ state, ev);
+ if (tevent_req_nomem(state, req)) {
+ return tevent_req_post(req, ev);
+ }
+
+ /*
+ * We add ourselves to the "new_waiters" array, not the "waiters"
+ * array. If we are called from within messaging_read_done,
+ * messaging_dispatch_rec will be in an active for-loop on
+ * "waiters". We must be careful not to mess with this array, because
+ * it could mean that a single event is being delivered twice.
+ */
+
new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
if (new_waiters_len == msg_ctx->num_new_waiters) {
tevent_req_set_cleanup_fn(req, NULL);
+ TALLOC_FREE(state->tevent_handle);
+
+ /*
+ * Just set the [new_]waiters entry to NULL, be careful not to mess
+ * with the other "waiters" array contents. We are often called from
+ * within "messaging_dispatch_rec", which loops over
+ * "waiters". Messing with the "waiters" array will mess up that
+ * for-loop.
+ */
+
for (i=0; i<msg_ctx->num_waiters; i++) {
if (msg_ctx->waiters[i] == req) {
msg_ctx->waiters[i] = NULL;
struct messaging_read_state *state = talloc_get_type_abort(
private_data, struct messaging_read_state);
+ if (rec->num_fds != 0) {
+ return false;
+ }
+
return rec->msg_type == state->msg_type;
}
return 0;
}
+struct messaging_handler_state {
+ struct tevent_context *ev;
+ struct messaging_context *msg_ctx;
+ uint32_t msg_type;
+ bool (*handler)(struct messaging_context *msg_ctx,
+ struct messaging_rec **rec, void *private_data);
+ void *private_data;
+};
+
+static void messaging_handler_got_msg(struct tevent_req *subreq);
+
+struct tevent_req *messaging_handler_send(
+ TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+ struct messaging_context *msg_ctx, uint32_t msg_type,
+ bool (*handler)(struct messaging_context *msg_ctx,
+ struct messaging_rec **rec, void *private_data),
+ void *private_data)
+{
+ struct tevent_req *req, *subreq;
+ struct messaging_handler_state *state;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct messaging_handler_state);
+ if (req == NULL) {
+ return NULL;
+ }
+ state->ev = ev;
+ state->msg_ctx = msg_ctx;
+ state->msg_type = msg_type;
+ state->handler = handler;
+ state->private_data = private_data;
+
+ subreq = messaging_read_send(state, state->ev, state->msg_ctx,
+ state->msg_type);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
+ return req;
+}
+
+static void messaging_handler_got_msg(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct messaging_handler_state *state = tevent_req_data(
+ req, struct messaging_handler_state);
+ struct messaging_rec *rec;
+ int ret;
+ bool ok;
+
+ ret = messaging_read_recv(subreq, state, &rec);
+ TALLOC_FREE(subreq);
+ if (tevent_req_error(req, ret)) {
+ return;
+ }
+
+ subreq = messaging_read_send(state, state->ev, state->msg_ctx,
+ state->msg_type);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, messaging_handler_got_msg, req);
+
+ ok = state->handler(state->msg_ctx, &rec, state->private_data);
+ TALLOC_FREE(rec);
+ if (ok) {
+ /*
+ * Next round
+ */
+ return;
+ }
+ TALLOC_FREE(subreq);
+ tevent_req_done(req);
+}
+
+int messaging_handler_recv(struct tevent_req *req)
+{
+ return tevent_req_simple_recv_unix(req);
+}
+
static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
{
if (msg_ctx->num_new_waiters == 0) {
/*
Dispatch one messaging_rec
*/
-void messaging_dispatch_rec(struct messaging_context *msg_ctx,
- struct messaging_rec *rec)
+static void messaging_dispatch_rec(struct messaging_context *msg_ctx,
+ struct messaging_rec *rec)
{
struct messaging_callback *cb, *next;
unsigned i;
+ size_t j;
for (cb = msg_ctx->callbacks; cb != NULL; cb = next) {
next = cb->next;
- if (cb->msg_type == rec->msg_type) {
- cb->fn(msg_ctx, cb->private_data, rec->msg_type,
- rec->src, &rec->buf);
- /* we continue looking for matching messages
- after finding one. This matters for
- subsystems like the internal notify code
- which register more than one handler for
- the same message type */
+ if (cb->msg_type != rec->msg_type) {
+ continue;
}
+
+ /*
+ * the old style callbacks don't support fd passing
+ */
+ for (j=0; j < rec->num_fds; j++) {
+ int fd = rec->fds[j];
+ close(fd);
+ }
+ rec->num_fds = 0;
+ rec->fds = NULL;
+
+ cb->fn(msg_ctx, cb->private_data, rec->msg_type,
+ rec->src, &rec->buf);
+
+ /*
+ * we continue looking for matching messages after finding
+ * one. This matters for subsystems like the internal notify
+ * code which register more than one handler for the same
+ * message type
+ */
}
if (!messaging_append_new_waiters(msg_ctx)) {
+ for (j=0; j < rec->num_fds; j++) {
+ int fd = rec->fds[j];
+ close(fd);
+ }
+ rec->num_fds = 0;
+ rec->fds = NULL;
return;
}
* to keep the order of waiters, as
* other code may depend on this.
*/
- if (i < msg_ctx->num_waiters - 1) {
+ if (i < msg_ctx->num_waiters - 1) {
memmove(&msg_ctx->waiters[i],
&msg_ctx->waiters[i+1],
sizeof(struct tevent_req *) *
req, struct messaging_filtered_read_state);
if (state->filter(rec, state->private_data)) {
messaging_filtered_read_done(req, rec);
+
+ /*
+ * Only the first one gets the fd-array
+ */
+ rec->num_fds = 0;
+ rec->fds = NULL;
}
i += 1;
}
- return;
+
+ /*
+ * If the fd-array isn't used, just close it.
+ */
+ for (j=0; j < rec->num_fds; j++) {
+ int fd = rec->fds[j];
+ close(fd);
+ }
+ rec->num_fds = 0;
+ rec->fds = NULL;
}
static int mess_parent_dgm_cleanup(void *private_data);
static int mess_parent_dgm_cleanup(void *private_data)
{
- struct messaging_context *msg_ctx = talloc_get_type_abort(
- private_data, struct messaging_context);
- NTSTATUS status;
+ int ret;
- status = messaging_dgm_wipe(msg_ctx);
- DEBUG(10, ("messaging_dgm_wipe returned %s\n", nt_errstr(status)));
+ ret = messaging_dgm_wipe();
+ DEBUG(10, ("messaging_dgm_wipe returned %s\n",
+ ret ? strerror(ret) : "ok"));
return lp_parm_int(-1, "messaging", "messaging dgm cleanup interval",
60*15);
}
mess_parent_dgm_cleanup, msg);
if (req == NULL) {
DEBUG(1, ("background_job_send failed\n"));
+ return;
}
tevent_req_set_callback(req, mess_parent_dgm_cleanup_done, msg);
}
+int messaging_cleanup(struct messaging_context *msg_ctx, pid_t pid)
+{
+ int ret;
+
+ if (pid == 0) {
+ ret = messaging_dgm_wipe();
+ } else {
+ ret = messaging_dgm_cleanup(pid);
+ }
+
+ return ret;
+}
+
+struct tevent_context *messaging_tevent_context(
+ struct messaging_context *msg_ctx)
+{
+ return msg_ctx->event_ctx;
+}
+
+struct server_id_db *messaging_names_db(struct messaging_context *msg_ctx)
+{
+ return msg_ctx->names_db;
+}
+
/** @} **/
git.samba.org / samba.git / blobdiff