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-rw-r--r--ctdb/client/client_connect.c532
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;
+}
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