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, 382 insertions, 0 deletions

diff --git a/ctdb/event/event_daemon.c b/ctdb/event/event_daemon.c
new file mode 100644
index 0000000..d96ff6f
--- /dev/null
+++ b/ctdb/event/event_daemon.c
@@ -0,0 +1,382 @@
+/*
+   CTDB event daemon
+
+   Copyright (C) Amitay Isaacs  2018
+
+   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/filesys.h"
+
+#include <popt.h>
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/util/tevent_unix.h"
+
+#include "common/logging.h"
+#include "common/path.h"
+#include "common/sock_daemon.h"
+
+#include "event/event_private.h"
+
+struct event_daemon_state {
+	TALLOC_CTX *mem_ctx;
+	char *socket;
+	char *pidfile;
+	struct tevent_context *ev;
+	struct event_config *config;
+	struct sock_daemon_context *sockd;
+	struct event_context *eventd;
+};
+
+static int event_daemon_startup(void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+	int ret;
+
+	ret = event_context_init(e_state,
+				 e_state->ev,
+				 e_state->config,
+				 &e_state->eventd);
+	if (ret != 0) {
+		D_ERR("Failed to initialize event context\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int event_daemon_reconfigure(void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+	int ret;
+
+	ret = event_config_reload(e_state->config);
+	if (ret != 0) {
+		D_WARNING("Configuration reload failed\n");
+	}
+
+	return 0;
+}
+
+static int event_daemon_reopen_logs(void *private_data)
+{
+	bool status;
+
+	status = logging_reopen_logs();
+
+	return status ? 0 : 1;
+}
+
+static void event_daemon_shutdown(void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+
+	TALLOC_FREE(e_state->eventd);
+}
+
+static bool event_client_connect(struct sock_client_context *client,
+				 pid_t pid,
+				 void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+	int ret;
+
+	ret = eventd_client_add(e_state->eventd, client);
+	if (ret != 0) {
+		D_ERR("Failed to register client, ret=%d\n", ret);
+		return false;
+	}
+
+	return true;
+}
+
+static void event_client_disconnect(struct sock_client_context *client,
+				    void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+
+	eventd_client_del(e_state->eventd, client);
+}
+
+struct event_client_state {
+	struct tevent_context *ev;
+	struct event_context *eventd;
+	struct sock_client_context *client;
+	uint8_t *buf;
+	size_t buflen;
+};
+
+static void event_client_request_done(struct tevent_req *subreq);
+static void event_client_reply_done(struct tevent_req *subreq);
+
+static struct tevent_req *event_client_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct sock_client_context *client,
+					    uint8_t *buf,
+					    size_t buflen,
+					    void *private_data)
+{
+	struct event_daemon_state *e_state = talloc_get_type_abort(
+		private_data, struct event_daemon_state);
+	struct tevent_req *req, *subreq;
+	struct event_client_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_client_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->ev = ev;
+	state->eventd = e_state->eventd;
+	state->client = client;
+
+	subreq = event_pkt_send(state, ev, e_state->eventd, buf, buflen);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, event_client_request_done, req);
+
+	return req;
+}
+
+static void event_client_request_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_client_state *state = tevent_req_data(
+		req, struct event_client_state);
+	int ret = 0;
+	bool ok;
+
+	ok = event_pkt_recv(subreq, &ret, state, &state->buf, &state->buflen);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	ok = eventd_client_exists(state->eventd, state->client);
+	if (!ok) {
+		/* Client has already disconnected */
+		talloc_free(state->buf);
+		tevent_req_done(req);
+		return;
+	}
+
+	subreq = sock_socket_write_send(state,
+					state->ev,
+					state->client,
+					state->buf,
+					state->buflen);
+	if (tevent_req_nomem(subreq, req)) {
+		talloc_free(state->buf);
+		return;
+	}
+	tevent_req_set_callback(subreq, event_client_reply_done, req);
+}
+
+static void event_client_reply_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_client_state *state = tevent_req_data(
+		req, struct event_client_state);
+	int ret = 0;
+	bool ok;
+
+	talloc_free(state->buf);
+
+	ok = sock_socket_write_recv(subreq, &ret);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		D_ERR("Sending reply failed\n");
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+static bool event_client_recv(struct tevent_req *req, int *perr)
+{
+	if (tevent_req_is_unix_error(req, perr)) {
+		return false;
+	}
+
+	return true;
+}
+
+static struct {
+	int pid;
+	int startup_fd;
+} options = {
+	.pid = -1,
+	.startup_fd = -1,
+};
+
+struct poptOption cmdline_options[] = {
+	POPT_AUTOHELP
+	{ "pid", 'P', POPT_ARG_INT, &options.pid, 0,
+		"pid to wait for", "PID" },
+	{ "startup-fd", 'S', POPT_ARG_INT, &options.startup_fd, 0,
+		"file descriptor to notify of successful start", "FD" },
+	POPT_TABLEEND
+};
+
+int main(int argc, const char **argv)
+{
+	poptContext pc;
+	struct event_daemon_state *e_state;
+	struct sock_daemon_funcs daemon_funcs;
+	struct sock_socket_funcs socket_funcs;
+	const char *log_location = "file:";
+	const char *log_level = "NOTICE";
+	const char *t;
+	int interactive = 0;
+	int opt, ret;
+	bool ok;
+
+	pc = poptGetContext(argv[0],
+			    argc,
+			    argv,
+			    cmdline_options,
+			    0);
+	while ((opt = poptGetNextOpt(pc)) != -1) {
+		D_ERR("Invalid options %s: %s\n",
+		      poptBadOption(pc, 0),
+		      poptStrerror(opt));
+		exit(1);
+	}
+
+	t = getenv("CTDB_INTERACTIVE");
+	if (t != NULL) {
+		interactive = 1;
+	}
+
+	e_state = talloc_zero(NULL, struct event_daemon_state);
+	if (e_state == NULL) {
+		D_ERR("Memory allocation error\n");
+		ret = 1;
+		goto fail;
+	}
+
+	e_state->mem_ctx = talloc_new(e_state);
+	if (e_state->mem_ctx == NULL) {
+		D_ERR("Memory allocation error\n");
+		ret = 1;
+		goto fail;
+	}
+
+	e_state->socket = path_socket(e_state, "eventd");
+	if (e_state->socket == NULL) {
+		D_ERR("Memory allocation error\n");
+		ret = 1;
+		goto fail;
+	}
+
+	e_state->pidfile = path_pidfile(e_state, "eventd");
+	if (e_state->pidfile == NULL) {
+		D_ERR("Memory allocation error\n");
+		ret = 1;
+		goto fail;
+	}
+
+	ret = event_config_init(e_state, &e_state->config);
+	if (ret != 0) {
+		D_ERR("Failed to initialize event config\n");
+		goto fail;
+	}
+
+	e_state->ev = tevent_context_init(e_state->mem_ctx);
+	if (e_state->ev == NULL) {
+		D_ERR("Failed to initialize tevent\n");
+		ret = 1;
+		goto fail;
+	}
+
+	daemon_funcs = (struct sock_daemon_funcs) {
+		.startup = event_daemon_startup,
+		.reconfigure = event_daemon_reconfigure,
+		.reopen_logs = event_daemon_reopen_logs,
+		.shutdown = event_daemon_shutdown,
+	};
+
+	if (interactive == 0) {
+		log_location = event_config_log_location(e_state->config);
+		log_level = event_config_log_level(e_state->config);
+	}
+
+	ret = sock_daemon_setup(e_state->mem_ctx,
+				"ctdb-eventd",
+				log_location,
+				log_level,
+				&daemon_funcs,
+				e_state,
+				&e_state->sockd);
+	if (ret != 0) {
+		D_ERR("Failed to setup sock daemon\n");
+		goto fail;
+	}
+
+	socket_funcs = (struct sock_socket_funcs) {
+		.connect = event_client_connect,
+		.disconnect = event_client_disconnect,
+		.read_send = event_client_send,
+		.read_recv = event_client_recv,
+	};
+
+	ret = sock_daemon_add_unix(e_state->sockd,
+				   e_state->socket,
+				   &socket_funcs,
+				   e_state);
+	if (ret != 0) {
+		D_ERR("Failed to setup socket %s\n", e_state->socket);
+		goto fail;
+	}
+
+	if (options.startup_fd != -1) {
+		ok = sock_daemon_set_startup_fd(e_state->sockd,
+						options.startup_fd);
+		if (!ok) {
+			goto fail;
+		}
+	}
+
+	ret = sock_daemon_run(e_state->ev,
+			      e_state->sockd,
+			      e_state->pidfile,
+			      false,
+			      false,
+			      options.pid);
+	if (ret == EINTR) {
+		ret = 0;
+	}
+
+	if (t != NULL) {
+		talloc_report_full(e_state->mem_ctx, stderr);
+	}
+
+fail:
+	talloc_free(e_state);
+	(void)poptFreeContext(pc);
+	exit(ret);
+}