Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 532 insertions, 0 deletions

diff --git a/ctdb/client/client_connect.c b/ctdb/client/client_connect.c
new file mode 100644
index 0000000..a942871
--- /dev/null
+++ b/ctdb/client/client_connect.c
@@ -0,0 +1,532 @@
+/*
+   CTDB client code
+
+   Copyright (C) Amitay Isaacs  2015
+
+   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; either version 3 of the License, or
+   (at your option) any later version.
+
+   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 "replace.h"
+#include "system/network.h"
+#include "system/filesys.h"
+
+#include <talloc.h>
+#include <tevent.h>
+#include <tdb.h>
+
+#include "common/reqid.h"
+#include "common/srvid.h"
+#include "common/comm.h"
+#include "common/logging.h"
+
+#include "lib/util/tevent_unix.h"
+#include "lib/util/debug.h"
+
+#include "protocol/protocol.h"
+#include "protocol/protocol_api.h"
+
+#include "client/client_private.h"
+#include "client/client.h"
+#include "client/client_sync.h"
+
+static void client_read_handler(uint8_t *buf, size_t buflen,
+				void *private_data);
+static void client_dead_handler(void *private_data);
+
+struct ctdb_client_init_state {
+	struct ctdb_client_context *client;
+};
+
+static int ctdb_client_context_destructor(struct ctdb_client_context *client);
+static void ctdb_client_init_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_client_init_send(TALLOC_CTX *mem_ctx,
+					 struct tevent_context *ev,
+					 const char *sockpath)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_client_init_state *state;
+	struct ctdb_client_context *client;
+	struct ctdb_req_control request;
+	struct sockaddr_un addr;
+	size_t len;
+	int ret;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_client_init_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	if (sockpath == NULL) {
+		D_ERR("socket path cannot be NULL\n");
+		tevent_req_error(req, EINVAL);
+		return tevent_req_post(req, ev);
+	}
+
+	client = talloc_zero(state, struct ctdb_client_context);
+	if (tevent_req_nomem(client, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	ret = reqid_init(client, INT_MAX-200, &client->idr);
+	if (ret != 0) {
+		D_ERR("reqid_init() failed, ret=%d\n", ret);
+		talloc_free(client);
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	ret = srvid_init(client, &client->srv);
+	if (ret != 0) {
+		DEBUG(DEBUG_ERR, ("srvid_init() failed, ret=%d\n", ret));
+		talloc_free(client);
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	ret = srvid_init(client, &client->tunnels);
+	if (ret != 0) {
+		DEBUG(DEBUG_ERR, ("srvid_init() failed, ret=%d\n", ret));
+		talloc_free(client);
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	memset(&addr, 0, sizeof(addr));
+	addr.sun_family = AF_UNIX;
+	len = strlcpy(addr.sun_path, sockpath, sizeof(addr.sun_path));
+	if (len != strlen(sockpath)) {
+		D_ERR("socket path too long, len=%zu\n", strlen(sockpath));
+		talloc_free(client);
+		tevent_req_error(req, ENAMETOOLONG);
+		return tevent_req_post(req, ev);
+	}
+
+	client->fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (client->fd == -1) {
+		ret = errno;
+		D_ERR("socket() failed, errno=%d\n", ret);
+		talloc_free(client);
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	ret = connect(client->fd, (struct sockaddr *)&addr, sizeof(addr));
+	if (ret == -1) {
+		ret = errno;
+		DEBUG(DEBUG_ERR, ("connect() failed, errno=%d\n", ret));
+		close(client->fd);
+		talloc_free(client);
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	ret = comm_setup(client, ev, client->fd, client_read_handler, client,
+			 client_dead_handler, client, &client->comm);
+	if (ret != 0) {
+		DEBUG(DEBUG_ERR, ("comm_setup() failed, ret=%d\n", ret));
+		close(client->fd);
+		talloc_free(client);
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	client->pnn = CTDB_UNKNOWN_PNN;
+
+	talloc_set_destructor(client, ctdb_client_context_destructor);
+
+	state->client = client;
+
+	ctdb_req_control_get_pnn(&request);
+	subreq = ctdb_client_control_send(state, ev, client,
+					  CTDB_CURRENT_NODE,
+					  tevent_timeval_zero(),
+					  &request);
+	if (tevent_req_nomem(subreq, req)) {
+		TALLOC_FREE(state->client);
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_client_init_done, req);
+
+	return req;
+}
+
+static int ctdb_client_context_destructor(struct ctdb_client_context *client)
+{
+	if (client->fd != -1) {
+		close(client->fd);
+		client->fd = -1;
+	}
+	return 0;
+}
+
+static void ctdb_client_init_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_client_init_state *state = tevent_req_data(
+		req, struct ctdb_client_init_state);
+	struct ctdb_reply_control *reply;
+	int ret;
+	bool status;
+
+	status = ctdb_client_control_recv(subreq, &ret, state, &reply);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	ret = ctdb_reply_control_get_pnn(reply, &state->client->pnn);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+bool ctdb_client_init_recv(struct tevent_req *req, int *perr,
+			   TALLOC_CTX *mem_ctx,
+			   struct ctdb_client_context **result)
+{
+	struct ctdb_client_init_state *state = tevent_req_data(
+		req, struct ctdb_client_init_state);
+	int ret;
+
+	if (tevent_req_is_unix_error(req, &ret)) {
+		if (perr != NULL) {
+			*perr = ret;
+		}
+		return false;
+	}
+
+	*result = talloc_steal(mem_ctx, state->client);
+	return true;
+}
+
+
+int ctdb_client_init(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+		     const char *sockpath, struct ctdb_client_context **out)
+{
+	struct tevent_req *req;
+	int ret;
+	bool status;
+
+	req = ctdb_client_init_send(mem_ctx, ev, sockpath);
+	if (req == NULL) {
+		return ENOMEM;
+	}
+
+	tevent_req_poll(req, ev);
+
+	status = ctdb_client_init_recv(req, &ret, mem_ctx, out);
+	TALLOC_FREE(req);
+	if (! status) {
+		return ret;
+	}
+
+	return 0;
+}
+
+static void client_read_handler(uint8_t *buf, size_t buflen,
+				void *private_data)
+{
+	struct ctdb_client_context *client = talloc_get_type_abort(
+		private_data, struct ctdb_client_context);
+	struct ctdb_req_header hdr;
+	size_t np;
+	int ret;
+
+	ret = ctdb_req_header_pull(buf, buflen, &hdr, &np);
+	if (ret != 0) {
+		DEBUG(DEBUG_WARNING, ("invalid header, ret=%d\n", ret));
+		return;
+	}
+
+	if (buflen != hdr.length) {
+		DEBUG(DEBUG_WARNING, ("packet size mismatch %zu != %d\n",
+				      buflen, hdr.length));
+		return;
+	}
+
+	ret = ctdb_req_header_verify(&hdr, 0);
+	if (ret != 0) {
+		DEBUG(DEBUG_WARNING, ("invalid header, ret=%d\n", ret));
+		return;
+	}
+
+	switch (hdr.operation) {
+	case CTDB_REPLY_CALL:
+		ctdb_client_reply_call(client, buf, buflen, hdr.reqid);
+		break;
+
+	case CTDB_REQ_MESSAGE:
+		ctdb_client_req_message(client, buf, buflen, hdr.reqid);
+		break;
+
+	case CTDB_REPLY_CONTROL:
+		ctdb_client_reply_control(client, buf, buflen, hdr.reqid);
+		break;
+
+	case CTDB_REQ_TUNNEL:
+		ctdb_client_req_tunnel(client, buf, buflen, hdr.reqid);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void client_dead_handler(void *private_data)
+{
+	struct ctdb_client_context *client = talloc_get_type_abort(
+		private_data, struct ctdb_client_context);
+	ctdb_client_callback_func_t callback = client->callback;
+	void *callback_data = client->private_data;
+
+	if (callback != NULL) {
+		callback(callback_data);
+		return;
+	}
+
+	DEBUG(DEBUG_NOTICE, ("connection to daemon closed, exiting\n"));
+	exit(1);
+}
+
+void ctdb_client_set_disconnect_callback(struct ctdb_client_context *client,
+					 ctdb_client_callback_func_t callback,
+					 void *private_data)
+{
+	client->callback = callback;
+	client->private_data = private_data;
+}
+
+uint32_t ctdb_client_pnn(struct ctdb_client_context *client)
+{
+	return client->pnn;
+}
+
+void ctdb_client_wait(struct tevent_context *ev, bool *done)
+{
+	while (! (*done)) {
+		tevent_loop_once(ev);
+	}
+}
+
+static void ctdb_client_wait_timeout_handler(struct tevent_context *ev,
+					     struct tevent_timer *te,
+					     struct timeval t,
+					     void *private_data)
+{
+	bool *timed_out = (bool *)private_data;
+
+	*timed_out = true;
+}
+
+int ctdb_client_wait_func_timeout(struct tevent_context *ev,
+				  bool (*done_func)(void *private_data),
+				  void *private_data,
+				  struct timeval timeout)
+{
+	TALLOC_CTX *mem_ctx;
+	struct tevent_timer *timer;
+	bool timed_out = false;
+
+	mem_ctx = talloc_new(ev);
+	if (mem_ctx == NULL) {
+		return ENOMEM;
+	}
+
+	timer = tevent_add_timer(ev, mem_ctx, timeout,
+				 ctdb_client_wait_timeout_handler,
+				 &timed_out);
+	if (timer == NULL) {
+		talloc_free(mem_ctx);
+		return ENOMEM;
+	}
+
+	while (! (done_func(private_data)) && ! timed_out) {
+		tevent_loop_once(ev);
+	}
+
+	talloc_free(mem_ctx);
+
+	if (timed_out) {
+		return ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static bool client_wait_done(void *private_data)
+{
+	bool *done = (bool *)private_data;
+
+	return *done;
+}
+
+int ctdb_client_wait_timeout(struct tevent_context *ev,
+			     bool *done,
+			     struct timeval timeout)
+
+{
+	int ret;
+
+	ret = ctdb_client_wait_func_timeout(ev,
+					    client_wait_done,
+					    done,
+					    timeout);
+
+	return ret;
+}
+
+struct ctdb_recovery_wait_state {
+	struct tevent_context *ev;
+	struct ctdb_client_context *client;
+};
+
+static void ctdb_recovery_wait_recmode(struct tevent_req *subreq);
+static void ctdb_recovery_wait_retry(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_recovery_wait_send(TALLOC_CTX *mem_ctx,
+					   struct tevent_context *ev,
+					   struct ctdb_client_context *client)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_recovery_wait_state *state;
+	struct ctdb_req_control request;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_recovery_wait_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->ev = ev;
+	state->client = client;
+
+	ctdb_req_control_get_recmode(&request);
+	subreq = ctdb_client_control_send(state, ev, client, client->pnn,
+					  tevent_timeval_zero(), &request);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_recovery_wait_recmode, req);
+
+	return req;
+}
+
+static void ctdb_recovery_wait_recmode(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_recovery_wait_state *state = tevent_req_data(
+		req, struct ctdb_recovery_wait_state);
+	struct ctdb_reply_control *reply;
+	int recmode;
+	int ret;
+	bool status;
+
+	status = ctdb_client_control_recv(subreq, &ret, state, &reply);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	ret = ctdb_reply_control_get_recmode(reply, &recmode);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	if (recmode == CTDB_RECOVERY_NORMAL) {
+		tevent_req_done(req);
+		return;
+	}
+
+	subreq = tevent_wakeup_send(state, state->ev,
+				    tevent_timeval_current_ofs(1, 0));
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, ctdb_recovery_wait_retry, req);
+}
+
+static void ctdb_recovery_wait_retry(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_recovery_wait_state *state = tevent_req_data(
+		req, struct ctdb_recovery_wait_state);
+	struct ctdb_req_control request;
+	bool status;
+
+	status = tevent_wakeup_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		tevent_req_error(req, ENOMEM);
+		return;
+	}
+
+	ctdb_req_control_get_recmode(&request);
+	subreq = ctdb_client_control_send(state, state->ev, state->client,
+					  state->client->pnn,
+					  tevent_timeval_zero(), &request);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, ctdb_recovery_wait_recmode, req);
+}
+
+bool ctdb_recovery_wait_recv(struct tevent_req *req, int *perr)
+{
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		if (perr != NULL) {
+			*perr = err;
+		}
+		return false;
+	}
+
+	return true;
+}
+
+bool ctdb_recovery_wait(struct tevent_context *ev,
+			struct ctdb_client_context *client)
+{
+	TALLOC_CTX *mem_ctx;
+	struct tevent_req *req;
+	bool status;
+
+	mem_ctx = talloc_new(client);
+	if (mem_ctx == NULL) {
+		return false;
+	}
+
+	req = ctdb_recovery_wait_send(mem_ctx, ev, client);
+	if (req == NULL) {
+		return false;
+	}
+
+	tevent_req_poll(req, ev);
+
+	status = ctdb_recovery_wait_recv(req, NULL);
+
+	talloc_free(mem_ctx);
+	return status;
+}