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-rw-r--r--ctdb/server/eventscript.c845
1 files changed, 845 insertions, 0 deletions
diff --git a/ctdb/server/eventscript.c b/ctdb/server/eventscript.c
new file mode 100644
index 0000000..3ea7d74
--- /dev/null
+++ b/ctdb/server/eventscript.c
@@ -0,0 +1,845 @@
+/*
+ event script handling
+
+ Copyright (C) Andrew Tridgell 2007
+
+ 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 "system/network.h"
+#include "system/wait.h"
+#include "system/dir.h"
+#include "system/locale.h"
+#include "system/time.h"
+#include "system/dir.h"
+
+#include <talloc.h>
+#include <tevent.h>
+
+#include "lib/util/dlinklist.h"
+#include "lib/util/debug.h"
+#include "lib/util/samba_util.h"
+#include "lib/util/sys_rw.h"
+
+#include "ctdb_private.h"
+
+#include "common/common.h"
+#include "common/logging.h"
+#include "common/reqid.h"
+#include "common/sock_io.h"
+#include "common/path.h"
+
+#include "protocol/protocol_util.h"
+#include "event/event_protocol_api.h"
+
+/*
+ * Setting up event daemon
+ */
+
+struct eventd_context {
+ struct tevent_context *ev;
+ const char *path;
+ const char *socket;
+
+ /* server state */
+ pid_t eventd_pid;
+ struct tevent_fd *eventd_fde;
+
+ /* client state */
+ struct reqid_context *idr;
+ struct sock_queue *queue;
+ struct eventd_client_state *calls;
+};
+
+static bool eventd_context_init(TALLOC_CTX *mem_ctx,
+ struct ctdb_context *ctdb,
+ struct eventd_context **out)
+{
+ struct eventd_context *ectx;
+ const char *eventd = CTDB_HELPER_BINDIR "/ctdb-eventd";
+ const char *value;
+ int ret;
+
+ ectx = talloc_zero(mem_ctx, struct eventd_context);
+ if (ectx == NULL) {
+ return false;
+ }
+
+ ectx->ev = ctdb->ev;
+
+ value = getenv("CTDB_EVENTD");
+ if (value != NULL) {
+ eventd = value;
+ }
+
+ ectx->path = talloc_strdup(ectx, eventd);
+ if (ectx->path == NULL) {
+ talloc_free(ectx);
+ return false;
+ }
+
+ ectx->socket = path_socket(ectx, "eventd");
+ if (ectx->socket == NULL) {
+ talloc_free(ectx);
+ return false;
+ }
+
+ ret = reqid_init(ectx, 1, &ectx->idr);
+ if (ret != 0) {
+ talloc_free(ectx);
+ return false;
+ }
+
+ ectx->eventd_pid = -1;
+
+ *out = ectx;
+ return true;
+}
+
+struct eventd_startup_state {
+ bool done;
+ int ret;
+ int fd;
+};
+
+static void eventd_startup_timeout_handler(struct tevent_context *ev,
+ struct tevent_timer *te,
+ struct timeval t,
+ void *private_data)
+{
+ struct eventd_startup_state *state =
+ (struct eventd_startup_state *) private_data;
+
+ state->done = true;
+ state->ret = ETIMEDOUT;
+}
+
+static void eventd_startup_handler(struct tevent_context *ev,
+ struct tevent_fd *fde, uint16_t flags,
+ void *private_data)
+{
+ struct eventd_startup_state *state =
+ (struct eventd_startup_state *)private_data;
+ unsigned int data;
+ ssize_t num_read;
+
+ num_read = sys_read(state->fd, &data, sizeof(data));
+ if (num_read == sizeof(data)) {
+ if (data == 0) {
+ state->ret = 0;
+ } else {
+ state->ret = EIO;
+ }
+ } else if (num_read == 0) {
+ state->ret = EPIPE;
+ } else if (num_read == -1) {
+ state->ret = errno;
+ } else {
+ state->ret = EINVAL;
+ }
+
+ state->done = true;
+}
+
+
+static int wait_for_daemon_startup(struct tevent_context *ev,
+ int fd)
+{
+ TALLOC_CTX *mem_ctx;
+ struct tevent_timer *timer;
+ struct tevent_fd *fde;
+ struct eventd_startup_state state = {
+ .done = false,
+ .ret = 0,
+ .fd = fd,
+ };
+
+ mem_ctx = talloc_new(ev);
+ if (mem_ctx == NULL) {
+ return ENOMEM;
+ }
+
+ timer = tevent_add_timer(ev,
+ mem_ctx,
+ tevent_timeval_current_ofs(10, 0),
+ eventd_startup_timeout_handler,
+ &state);
+ if (timer == NULL) {
+ talloc_free(mem_ctx);
+ return ENOMEM;
+ }
+
+ fde = tevent_add_fd(ev,
+ mem_ctx,
+ fd,
+ TEVENT_FD_READ,
+ eventd_startup_handler,
+ &state);
+ if (fde == NULL) {
+ talloc_free(mem_ctx);
+ return ENOMEM;
+ }
+
+ while (! state.done) {
+ tevent_loop_once(ev);
+ }
+
+ talloc_free(mem_ctx);
+
+ return state.ret;
+}
+
+
+/*
+ * Start and stop event daemon
+ */
+
+static bool eventd_client_connect(struct eventd_context *ectx);
+static void eventd_dead_handler(struct tevent_context *ev,
+ struct tevent_fd *fde, uint16_t flags,
+ void *private_data);
+
+int ctdb_start_eventd(struct ctdb_context *ctdb)
+{
+ struct eventd_context *ectx;
+ const char **argv;
+ int fd[2];
+ pid_t pid;
+ int ret;
+ bool status;
+
+ if (ctdb->ectx == NULL) {
+ status = eventd_context_init(ctdb, ctdb, &ctdb->ectx);
+ if (! status) {
+ DEBUG(DEBUG_ERR,
+ ("Failed to initialize eventd context\n"));
+ return -1;
+ }
+ }
+
+ ectx = ctdb->ectx;
+
+ if (! sock_clean(ectx->socket)) {
+ return -1;
+ }
+
+ ret = pipe(fd);
+ if (ret != 0) {
+ return -1;
+ }
+
+ argv = talloc_array(ectx, const char *, 6);
+ if (argv == NULL) {
+ close(fd[0]);
+ close(fd[1]);
+ return -1;
+ }
+
+ argv[0] = ectx->path;
+ argv[1] = "-P";
+ argv[2] = talloc_asprintf(argv, "%d", ctdb->ctdbd_pid);
+ argv[3] = "-S";
+ argv[4] = talloc_asprintf(argv, "%d", fd[1]);
+ argv[5] = NULL;
+
+ if (argv[2] == NULL || argv[4] == NULL) {
+ close(fd[0]);
+ close(fd[1]);
+ talloc_free(argv);
+ return -1;
+ }
+
+ D_NOTICE("Starting event daemon %s %s %s %s %s\n",
+ argv[0],
+ argv[1],
+ argv[2],
+ argv[3],
+ argv[4]);
+
+ pid = ctdb_fork(ctdb);
+ if (pid == -1) {
+ close(fd[0]);
+ close(fd[1]);
+ talloc_free(argv);
+ return -1;
+ }
+
+ if (pid == 0) {
+ close(fd[0]);
+ ret = execv(argv[0], discard_const(argv));
+ if (ret == -1) {
+ _exit(errno);
+ }
+ _exit(0);
+ }
+
+ talloc_free(argv);
+ close(fd[1]);
+
+ ret = wait_for_daemon_startup(ctdb->ev, fd[0]);
+ if (ret != 0) {
+ ctdb_kill(ctdb, pid, SIGKILL);
+ close(fd[0]);
+ D_ERR("Failed to initialize event daemon (%d)\n", ret);
+ return -1;
+ }
+
+ ectx->eventd_fde = tevent_add_fd(ctdb->ev, ectx, fd[0],
+ TEVENT_FD_READ,
+ eventd_dead_handler, ectx);
+ if (ectx->eventd_fde == NULL) {
+ ctdb_kill(ctdb, pid, SIGKILL);
+ close(fd[0]);
+ return -1;
+ }
+
+ tevent_fd_set_auto_close(ectx->eventd_fde);
+ ectx->eventd_pid = pid;
+
+ status = eventd_client_connect(ectx);
+ if (! status) {
+ DEBUG(DEBUG_ERR, ("Failed to connect to event daemon\n"));
+ ctdb_stop_eventd(ctdb);
+ return -1;
+ }
+
+ return 0;
+}
+
+static void eventd_dead_handler(struct tevent_context *ev,
+ struct tevent_fd *fde, uint16_t flags,
+ void *private_data)
+{
+ D_ERR("Eventd went away - exiting\n");
+ exit(1);
+}
+
+void ctdb_stop_eventd(struct ctdb_context *ctdb)
+{
+ struct eventd_context *ectx = ctdb->ectx;
+
+ if (ectx == NULL) {
+ return;
+ }
+
+ TALLOC_FREE(ectx->eventd_fde);
+ if (ectx->eventd_pid != -1) {
+ kill(ectx->eventd_pid, SIGTERM);
+ ectx->eventd_pid = -1;
+ }
+ TALLOC_FREE(ctdb->ectx);
+}
+
+/*
+ * Connect to event daemon
+ */
+
+struct eventd_client_state {
+ struct eventd_client_state *prev, *next;
+
+ struct eventd_context *ectx;
+ void (*callback)(struct ctdb_event_reply *reply, void *private_data);
+ void *private_data;
+
+ uint32_t reqid;
+ uint8_t *buf;
+ size_t buflen;
+};
+
+static void eventd_client_read(uint8_t *buf, size_t buflen,
+ void *private_data);
+static int eventd_client_state_destructor(struct eventd_client_state *state);
+
+static bool eventd_client_connect(struct eventd_context *ectx)
+{
+ int fd;
+
+ if (ectx->queue != NULL) {
+ return true;
+ }
+
+ fd = sock_connect(ectx->socket);
+ if (fd == -1) {
+ return false;
+ }
+
+ ectx->queue = sock_queue_setup(ectx, ectx->ev, fd,
+ eventd_client_read, ectx);
+ if (ectx->queue == NULL) {
+ close(fd);
+ return false;
+ }
+
+ return true;
+}
+
+static int eventd_client_write(struct eventd_context *ectx,
+ TALLOC_CTX *mem_ctx,
+ struct ctdb_event_request *request,
+ void (*callback)(struct ctdb_event_reply *reply,
+ void *private_data),
+ void *private_data)
+{
+ struct ctdb_event_header header = { 0 };
+ struct eventd_client_state *state;
+ int ret;
+
+ if (! eventd_client_connect(ectx)) {
+ return -1;
+ }
+
+ state = talloc_zero(mem_ctx, struct eventd_client_state);
+ if (state == NULL) {
+ return -1;
+ }
+
+ state->ectx = ectx;
+ state->callback = callback;
+ state->private_data = private_data;
+
+ state->reqid = reqid_new(ectx->idr, state);
+ if (state->reqid == REQID_INVALID) {
+ talloc_free(state);
+ return -1;
+ }
+
+ talloc_set_destructor(state, eventd_client_state_destructor);
+
+ header.reqid = state->reqid;
+
+ state->buflen = ctdb_event_request_len(&header, request);
+ state->buf = talloc_size(state, state->buflen);
+ if (state->buf == NULL) {
+ talloc_free(state);
+ return -1;
+ }
+
+ ret = ctdb_event_request_push(&header,
+ request,
+ state->buf,
+ &state->buflen);
+ if (ret != 0) {
+ talloc_free(state);
+ return -1;
+ }
+
+ ret = sock_queue_write(ectx->queue, state->buf, state->buflen);
+ if (ret != 0) {
+ talloc_free(state);
+ return -1;
+ }
+
+ DLIST_ADD(ectx->calls, state);
+
+ return 0;
+}
+
+static int eventd_client_state_destructor(struct eventd_client_state *state)
+{
+ struct eventd_context *ectx = state->ectx;
+
+ reqid_remove(ectx->idr, state->reqid);
+ DLIST_REMOVE(ectx->calls, state);
+ return 0;
+}
+
+static void eventd_client_read(uint8_t *buf, size_t buflen,
+ void *private_data)
+{
+ struct eventd_context *ectx = talloc_get_type_abort(
+ private_data, struct eventd_context);
+ struct eventd_client_state *state;
+ struct ctdb_event_header header;
+ struct ctdb_event_reply *reply;
+ int ret;
+
+ if (buf == NULL) {
+ /* connection lost */
+ TALLOC_FREE(ectx->queue);
+ return;
+ }
+
+ ret = ctdb_event_reply_pull(buf, buflen, &header, ectx, &reply);
+ if (ret != 0) {
+ D_ERR("Invalid packet received, ret=%d\n", ret);
+ return;
+ }
+
+ if (buflen != header.length) {
+ D_ERR("Packet size mismatch %zu != %"PRIu32"\n",
+ buflen, header.length);
+ talloc_free(reply);
+ return;
+ }
+
+ state = reqid_find(ectx->idr, header.reqid,
+ struct eventd_client_state);
+ if (state == NULL) {
+ talloc_free(reply);
+ return;
+ }
+
+ if (state->reqid != header.reqid) {
+ talloc_free(reply);
+ return;
+ }
+
+ state = talloc_steal(reply, state);
+ state->callback(reply, state->private_data);
+ talloc_free(reply);
+}
+
+/*
+ * Run an event
+ */
+
+struct eventd_client_run_state {
+ struct eventd_context *ectx;
+ void (*callback)(int result, void *private_data);
+ void *private_data;
+};
+
+static void eventd_client_run_done(struct ctdb_event_reply *reply,
+ void *private_data);
+
+static int eventd_client_run(struct eventd_context *ectx,
+ TALLOC_CTX *mem_ctx,
+ void (*callback)(int result,
+ void *private_data),
+ void *private_data,
+ enum ctdb_event event,
+ const char *arg_str,
+ uint32_t timeout)
+{
+ struct eventd_client_run_state *state;
+ struct ctdb_event_request request;
+ struct ctdb_event_request_run rdata;
+ int ret;
+
+ state = talloc_zero(mem_ctx, struct eventd_client_run_state);
+ if (state == NULL) {
+ return -1;
+ }
+
+ state->ectx = ectx;
+ state->callback = callback;
+ state->private_data = private_data;
+
+ rdata.component = "legacy";
+ rdata.event = ctdb_event_to_string(event);
+ rdata.args = arg_str;
+ rdata.timeout = timeout;
+ rdata.flags = 0;
+
+ request.cmd = CTDB_EVENT_CMD_RUN;
+ request.data.run = &rdata;
+
+ ret = eventd_client_write(ectx, state, &request,
+ eventd_client_run_done, state);
+ if (ret != 0) {
+ talloc_free(state);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void eventd_client_run_done(struct ctdb_event_reply *reply,
+ void *private_data)
+{
+ struct eventd_client_run_state *state = talloc_get_type_abort(
+ private_data, struct eventd_client_run_state);
+
+ state = talloc_steal(state->ectx, state);
+ state->callback(reply->result, state->private_data);
+ talloc_free(state);
+}
+
+/*
+ * CTDB event script functions
+ */
+
+int ctdb_event_script_run(struct ctdb_context *ctdb,
+ TALLOC_CTX *mem_ctx,
+ void (*callback)(struct ctdb_context *ctdb,
+ int result, void *private_data),
+ void *private_data,
+ enum ctdb_event event,
+ const char *fmt, va_list ap)
+ PRINTF_ATTRIBUTE(6,0);
+
+struct ctdb_event_script_run_state {
+ struct ctdb_context *ctdb;
+ void (*callback)(struct ctdb_context *ctdb, int result,
+ void *private_data);
+ void *private_data;
+ enum ctdb_event event;
+};
+
+static bool event_allowed_during_recovery(enum ctdb_event event);
+static void ctdb_event_script_run_done(int result, void *private_data);
+static bool check_options(enum ctdb_event call, const char *options);
+
+int ctdb_event_script_run(struct ctdb_context *ctdb,
+ TALLOC_CTX *mem_ctx,
+ void (*callback)(struct ctdb_context *ctdb,
+ int result, void *private_data),
+ void *private_data,
+ enum ctdb_event event,
+ const char *fmt, va_list ap)
+{
+ struct ctdb_event_script_run_state *state;
+ char *arg_str;
+ int ret;
+
+ if ( (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) &&
+ (! event_allowed_during_recovery(event)) ) {
+ DEBUG(DEBUG_ERR,
+ ("Refusing to run event '%s' while in recovery\n",
+ ctdb_eventscript_call_names[event]));
+ return -1;
+ }
+
+ state = talloc_zero(mem_ctx, struct ctdb_event_script_run_state);
+ if (state == NULL) {
+ return -1;
+ }
+
+ state->ctdb = ctdb;
+ state->callback = callback;
+ state->private_data = private_data;
+ state->event = event;
+
+ if (fmt != NULL) {
+ arg_str = talloc_vasprintf(state, fmt, ap);
+ if (arg_str == NULL) {
+ talloc_free(state);
+ return -1;
+ }
+ } else {
+ arg_str = NULL;
+ }
+
+ if (! check_options(event, arg_str)) {
+ DEBUG(DEBUG_ERR,
+ ("Bad event script arguments '%s' for '%s'\n",
+ arg_str, ctdb_eventscript_call_names[event]));
+ talloc_free(arg_str);
+ return -1;
+ }
+
+ ret = eventd_client_run(ctdb->ectx, state,
+ ctdb_event_script_run_done, state,
+ event, arg_str, ctdb->tunable.script_timeout);
+ if (ret != 0) {
+ talloc_free(state);
+ return ret;
+ }
+
+ DEBUG(DEBUG_INFO,
+ (__location__ " Running event %s with arguments %s\n",
+ ctdb_eventscript_call_names[event], arg_str));
+
+ talloc_free(arg_str);
+ return 0;
+}
+
+static void ctdb_event_script_run_done(int result, void *private_data)
+{
+ struct ctdb_event_script_run_state *state = talloc_get_type_abort(
+ private_data, struct ctdb_event_script_run_state);
+
+ if (result == ETIMEDOUT) {
+ switch (state->event) {
+ case CTDB_EVENT_START_RECOVERY:
+ case CTDB_EVENT_RECOVERED:
+ case CTDB_EVENT_TAKE_IP:
+ case CTDB_EVENT_RELEASE_IP:
+ DEBUG(DEBUG_ERR,
+ ("Ignoring hung script for %s event\n",
+ ctdb_eventscript_call_names[state->event]));
+ result = 0;
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ state = talloc_steal(state->ctdb, state);
+ state->callback(state->ctdb, result, state->private_data);
+ talloc_free(state);
+}
+
+
+static unsigned int count_words(const char *options)
+{
+ unsigned int words = 0;
+
+ if (options == NULL) {
+ return 0;
+ }
+
+ options += strspn(options, " \t");
+ while (*options) {
+ words++;
+ options += strcspn(options, " \t");
+ options += strspn(options, " \t");
+ }
+ return words;
+}
+
+static bool check_options(enum ctdb_event call, const char *options)
+{
+ switch (call) {
+ /* These all take no arguments. */
+ case CTDB_EVENT_INIT:
+ case CTDB_EVENT_SETUP:
+ case CTDB_EVENT_STARTUP:
+ case CTDB_EVENT_START_RECOVERY:
+ case CTDB_EVENT_RECOVERED:
+ case CTDB_EVENT_MONITOR:
+ case CTDB_EVENT_SHUTDOWN:
+ case CTDB_EVENT_IPREALLOCATED:
+ return count_words(options) == 0;
+
+ case CTDB_EVENT_TAKE_IP: /* interface, IP address, netmask bits. */
+ case CTDB_EVENT_RELEASE_IP:
+ return count_words(options) == 3;
+
+ case CTDB_EVENT_UPDATE_IP: /* old interface, new interface, IP address, netmask bits. */
+ return count_words(options) == 4;
+
+ default:
+ DEBUG(DEBUG_ERR,(__location__ "Unknown ctdb_event %u\n", call));
+ return false;
+ }
+}
+
+/* only specific events are allowed while in recovery */
+static bool event_allowed_during_recovery(enum ctdb_event event)
+{
+ const enum ctdb_event allowed_events[] = {
+ CTDB_EVENT_INIT,
+ CTDB_EVENT_SETUP,
+ CTDB_EVENT_START_RECOVERY,
+ CTDB_EVENT_SHUTDOWN,
+ CTDB_EVENT_RELEASE_IP,
+ CTDB_EVENT_IPREALLOCATED,
+ };
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(allowed_events); i++) {
+ if (event == allowed_events[i]) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/*
+ run the event script in the background, calling the callback when
+ finished. If mem_ctx is freed, callback will never be called.
+ */
+int ctdb_event_script_callback(struct ctdb_context *ctdb,
+ TALLOC_CTX *mem_ctx,
+ void (*callback)(struct ctdb_context *, int, void *),
+ void *private_data,
+ enum ctdb_event call,
+ const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = ctdb_event_script_run(ctdb, mem_ctx, callback, private_data,
+ call, fmt, ap);
+ va_end(ap);
+
+ return ret;
+}
+
+
+struct ctdb_event_script_args_state {
+ bool done;
+ int status;
+};
+
+static void ctdb_event_script_args_done(struct ctdb_context *ctdb,
+ int status, void *private_data)
+{
+ struct ctdb_event_script_args_state *s =
+ (struct ctdb_event_script_args_state *)private_data;
+
+ s->done = true;
+ s->status = status;
+}
+
+/*
+ run the event script, waiting for it to complete. Used when the caller
+ doesn't want to continue till the event script has finished.
+ */
+int ctdb_event_script_args(struct ctdb_context *ctdb, enum ctdb_event call,
+ const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+ struct ctdb_event_script_args_state state = {
+ .status = -1,
+ .done = false,
+ };
+
+ va_start(ap, fmt);
+ ret = ctdb_event_script_run(ctdb, ctdb,
+ ctdb_event_script_args_done, &state,
+ call, fmt, ap);
+ va_end(ap);
+ if (ret != 0) {
+ return ret;
+ }
+
+ while (! state.done) {
+ tevent_loop_once(ctdb->ev);
+ }
+
+ if (state.status == ETIMEDOUT) {
+ /* Don't ban self if CTDB is starting up or shutting down */
+ if (call != CTDB_EVENT_INIT && call != CTDB_EVENT_SHUTDOWN) {
+ DEBUG(DEBUG_ERR,
+ (__location__ " eventscript for '%s' timed out."
+ " Immediately banning ourself for %d seconds\n",
+ ctdb_eventscript_call_names[call],
+ ctdb->tunable.recovery_ban_period));
+ ctdb_ban_self(ctdb);
+ }
+ }
+
+ return state.status;
+}
+
+int ctdb_event_script(struct ctdb_context *ctdb, enum ctdb_event call)
+{
+ /* GCC complains about empty format string, so use %s and "". */
+ return ctdb_event_script_args(ctdb, call, NULL);
+}
+
+void ctdb_event_reopen_logs(struct ctdb_context *ctdb)
+{
+ if (ctdb->ectx->eventd_pid > 0) {
+ kill(ctdb->ectx->eventd_pid, SIGHUP);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 03:33:20 +0000