--- /dev/null
+/*
+ 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 "includes.h"
+#include <time.h>
+#include "system/filesys.h"
+#include "system/wait.h"
+#include "system/dir.h"
+#include "system/locale.h"
+#include "../include/ctdb_private.h"
+#include "lib/tevent/tevent.h"
+#include "../common/rb_tree.h"
+
+static void ctdb_event_script_timeout(struct event_context *ev, struct timed_event *te, struct timeval t, void *p);
+
+/*
+ ctdbd sends us a SIGTERM when we should die.
+ */
+static void sigterm(int sig)
+{
+ /* all the child processes will be running in the same process group */
+ kill(-getpgrp(), SIGKILL);
+ _exit(1);
+}
+
+/* This is attached to the event script state. */
+struct event_script_callback {
+ struct ctdb_event_script_state *state;
+
+ /* Warning: this can free us! */
+ void (*fn)(struct ctdb_context *, int, void *);
+ void *private_data;
+};
+
+
+struct ctdb_event_script_state {
+ struct ctdb_context *ctdb;
+ struct event_script_callback *callback;
+ pid_t child;
+ int fd[2];
+ bool from_user;
+ enum ctdb_eventscript_call call;
+ const char *options;
+ struct timeval timeout;
+
+ unsigned int current;
+ struct ctdb_scripts_wire *scripts;
+};
+
+static struct ctdb_script_wire *get_current_script(struct ctdb_event_script_state *state)
+{
+ return &state->scripts->scripts[state->current];
+}
+
+/* called from ctdb_logging when we have received output on STDERR from
+ * one of the eventscripts
+ */
+static void log_event_script_output(const char *str, uint16_t len, void *p)
+{
+ struct ctdb_event_script_state *state
+ = talloc_get_type(p, struct ctdb_event_script_state);
+ struct ctdb_script_wire *current;
+ unsigned int slen, min;
+
+ /* We may have been aborted to run something else. Discard */
+ if (state->scripts == NULL) {
+ return;
+ }
+
+ current = get_current_script(state);
+
+ /* Append, but don't overfill buffer. It starts zero-filled. */
+ slen = strlen(current->output);
+ min = MIN(len, sizeof(current->output) - slen - 1);
+
+ memcpy(current->output + slen, str, min);
+}
+
+int32_t ctdb_control_get_event_script_status(struct ctdb_context *ctdb,
+ uint32_t call_type,
+ TDB_DATA *outdata)
+{
+ if (call_type >= CTDB_EVENT_MAX) {
+ return -1;
+ }
+
+ if (ctdb->last_status[call_type] == NULL) {
+ /* If it's never been run, return nothing so they can tell. */
+ outdata->dsize = 0;
+ } else {
+ outdata->dsize = talloc_get_size(ctdb->last_status[call_type]);
+ outdata->dptr = (uint8_t *)ctdb->last_status[call_type];
+ }
+ return 0;
+}
+
+struct ctdb_script_tree_item {
+ const char *name;
+ int error;
+};
+
+/* Return true if OK, otherwise set errno. */
+static bool check_executable(const char *dir, const char *name)
+{
+ char *full;
+ struct stat st;
+
+ full = talloc_asprintf(NULL, "%s/%s", dir, name);
+ if (!full)
+ return false;
+
+ if (stat(full, &st) != 0) {
+ DEBUG(DEBUG_ERR,("Could not stat event script %s: %s\n",
+ full, strerror(errno)));
+ talloc_free(full);
+ return false;
+ }
+
+ if (!(st.st_mode & S_IXUSR)) {
+ DEBUG(DEBUG_DEBUG,("Event script %s is not executable. Ignoring this event script\n", full));
+ errno = ENOEXEC;
+ talloc_free(full);
+ return false;
+ }
+
+ talloc_free(full);
+ return true;
+}
+
+static struct ctdb_scripts_wire *ctdb_get_script_list(struct ctdb_context *ctdb, TALLOC_CTX *mem_ctx)
+{
+ DIR *dir;
+ struct dirent *de;
+ struct stat st;
+ trbt_tree_t *tree;
+ struct ctdb_scripts_wire *scripts;
+ TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
+ struct ctdb_script_tree_item *tree_item;
+ int count;
+
+ /*
+ the service specific event scripts
+ */
+ if (stat(ctdb->event_script_dir, &st) != 0 &&
+ errno == ENOENT) {
+ DEBUG(DEBUG_CRIT,("No event script directory found at '%s'\n", ctdb->event_script_dir));
+ talloc_free(tmp_ctx);
+ return NULL;
+ }
+
+ /* create a tree to store all the script names in */
+ tree = trbt_create(tmp_ctx, 0);
+
+ /* scan all directory entries and insert all valid scripts into the
+ tree
+ */
+ dir = opendir(ctdb->event_script_dir);
+ if (dir == NULL) {
+ DEBUG(DEBUG_CRIT,("Failed to open event script directory '%s'\n", ctdb->event_script_dir));
+ talloc_free(tmp_ctx);
+ return NULL;
+ }
+
+ count = 0;
+ while ((de=readdir(dir)) != NULL) {
+ int namlen;
+ unsigned num;
+
+ namlen = strlen(de->d_name);
+
+ if (namlen < 3) {
+ continue;
+ }
+
+ if (de->d_name[namlen-1] == '~') {
+ /* skip files emacs left behind */
+ continue;
+ }
+
+ if (de->d_name[2] != '.') {
+ continue;
+ }
+
+ if (sscanf(de->d_name, "%02u.", &num) != 1) {
+ continue;
+ }
+
+ if (strlen(de->d_name) > MAX_SCRIPT_NAME) {
+ DEBUG(DEBUG_ERR,("Script name %s too long! %u chars max",
+ de->d_name, MAX_SCRIPT_NAME));
+ continue;
+ }
+
+ tree_item = talloc(tree, struct ctdb_script_tree_item);
+ if (tree_item == NULL) {
+ DEBUG(DEBUG_ERR, (__location__ " Failed to allocate new tree item\n"));
+ talloc_free(tmp_ctx);
+ return NULL;
+ }
+
+ tree_item->error = 0;
+ if (!check_executable(ctdb->event_script_dir, de->d_name)) {
+ tree_item->error = errno;
+ }
+
+ tree_item->name = talloc_strdup(tree_item, de->d_name);
+ if (tree_item->name == NULL) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to allocate script name.\n"));
+ talloc_free(tmp_ctx);
+ return NULL;
+ }
+
+ /* store the event script in the tree */
+ trbt_insert32(tree, (num<<16)|count++, tree_item);
+ }
+ closedir(dir);
+
+ /* Overallocates by one, but that's OK */
+ scripts = talloc_zero_size(tmp_ctx,
+ sizeof(*scripts)
+ + sizeof(scripts->scripts[0]) * count);
+ if (scripts == NULL) {
+ DEBUG(DEBUG_ERR, (__location__ " Failed to allocate scripts\n"));
+ talloc_free(tmp_ctx);
+ return NULL;
+ }
+ scripts->num_scripts = count;
+
+ for (count = 0; count < scripts->num_scripts; count++) {
+ tree_item = trbt_findfirstarray32(tree, 1);
+
+ strcpy(scripts->scripts[count].name, tree_item->name);
+ scripts->scripts[count].status = -tree_item->error;
+
+ /* remove this script from the tree */
+ talloc_free(tree_item);
+ }
+
+ talloc_steal(mem_ctx, scripts);
+ talloc_free(tmp_ctx);
+ return scripts;
+}
+
+static int child_setup(struct ctdb_context *ctdb)
+{
+ if (setpgid(0,0) != 0) {
+ int ret = -errno;
+ DEBUG(DEBUG_ERR,("Failed to create process group for event scripts - %s\n",
+ strerror(errno)));
+ return ret;
+ }
+
+ signal(SIGTERM, sigterm);
+ return 0;
+}
+
+static char *child_command_string(struct ctdb_context *ctdb,
+ TALLOC_CTX *ctx,
+ bool from_user,
+ const char *scriptname,
+ enum ctdb_eventscript_call call,
+ const char *options)
+{
+ const char *str = from_user ? "CTDB_CALLED_BY_USER=1 " : "";
+
+ /* Allow a setting where we run the actual monitor event
+ from an external source and replace it with
+ a "status" event that just picks up the actual
+ status of the event asynchronously.
+ */
+ if ((ctdb->tunable.use_status_events_for_monitoring != 0)
+ && (call == CTDB_EVENT_MONITOR)
+ && !from_user) {
+ return talloc_asprintf(ctx, "%s%s/%s %s",
+ str,
+ ctdb->event_script_dir,
+ scriptname, "status");
+ } else {
+ return talloc_asprintf(ctx, "%s%s/%s %s %s",
+ str,
+ ctdb->event_script_dir,
+ scriptname,
+ ctdb_eventscript_call_names[call],
+ options);
+ }
+}
+
+static int child_run_one(struct ctdb_context *ctdb,
+ const char *scriptname, const char *cmdstr)
+{
+ int ret;
+
+ ret = system(cmdstr);
+ /* if the system() call was successful, translate ret into the
+ return code from the command
+ */
+ if (ret != -1) {
+ ret = WEXITSTATUS(ret);
+ } else {
+ ret = -errno;
+ }
+
+ /* 127 could mean it does not exist, 126 non-executable. */
+ if (ret == 127 || ret == 126) {
+ /* Re-check it... */
+ if (!check_executable(ctdb->event_script_dir, scriptname)) {
+ DEBUG(DEBUG_ERR,("Script %s returned status %u. Someone just deleted it?\n",
+ cmdstr, ret));
+ ret = -errno;
+ }
+ }
+ return ret;
+}
+
+/*
+ Actually run one event script
+ this function is called and run in the context of a forked child
+ which allows it to do blocking calls such as system()
+ */
+static int child_run_script(struct ctdb_context *ctdb,
+ bool from_user,
+ enum ctdb_eventscript_call call,
+ const char *options,
+ struct ctdb_script_wire *current)
+{
+ char *cmdstr;
+ int ret;
+ TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
+
+ ret = child_setup(ctdb);
+ if (ret != 0)
+ goto out;
+
+ cmdstr = child_command_string(ctdb, tmp_ctx, from_user,
+ current->name, call, options);
+ CTDB_NO_MEMORY(ctdb, cmdstr);
+
+ DEBUG(DEBUG_DEBUG,("Executing event script %s\n",cmdstr));
+
+ if (current->status) {
+ ret = current->status;
+ goto out;
+ }
+
+ ret = child_run_one(ctdb, current->name, cmdstr);
+out:
+ talloc_free(tmp_ctx);
+ return ret;
+}
+
+static void ctdb_event_script_handler(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *p);
+
+static int fork_child_for_script(struct ctdb_context *ctdb,
+ struct ctdb_event_script_state *state)
+{
+ int r;
+ struct tevent_fd *fde;
+ struct ctdb_script_wire *current = get_current_script(state);
+
+ current->start = timeval_current();
+
+ r = pipe(state->fd);
+ if (r != 0) {
+ DEBUG(DEBUG_ERR, (__location__ " pipe failed for child eventscript process\n"));
+ return -errno;
+ }
+
+ if (!ctdb_fork_with_logging(state, ctdb, current->name, log_event_script_output,
+ state, &state->child)) {
+ r = -errno;
+ close(state->fd[0]);
+ close(state->fd[1]);
+ return r;
+ }
+
+ /* If we are the child, do the work. */
+ if (state->child == 0) {
+ int rt;
+
+ debug_extra = talloc_asprintf(NULL, "eventscript-%s-%s:",
+ current->name,
+ ctdb_eventscript_call_names[state->call]);
+ close(state->fd[0]);
+ set_close_on_exec(state->fd[1]);
+
+ rt = child_run_script(ctdb, state->from_user, state->call, state->options, current);
+ /* We must be able to write PIPEBUF bytes at least; if this
+ somehow fails, the read above will be short. */
+ write(state->fd[1], &rt, sizeof(rt));
+ close(state->fd[1]);
+ _exit(rt);
+ }
+
+ close(state->fd[1]);
+ set_close_on_exec(state->fd[0]);
+
+ DEBUG(DEBUG_DEBUG, (__location__ " Created PIPE FD:%d to child eventscript process\n", state->fd[0]));
+
+ /* Set ourselves up to be called when that's done. */
+ fde = event_add_fd(ctdb->ev, state, state->fd[0], EVENT_FD_READ,
+ ctdb_event_script_handler, state);
+ tevent_fd_set_auto_close(fde);
+
+ return 0;
+}
+
+/*
+ Summarize status of this run of scripts.
+ */
+static int script_status(struct ctdb_scripts_wire *scripts)
+{
+ unsigned int i;
+
+ for (i = 0; i < scripts->num_scripts; i++) {
+ switch (scripts->scripts[i].status) {
+ case -ENOENT:
+ case -ENOEXEC:
+ /* Disabled or missing; that's OK. */
+ break;
+ case 0:
+ /* No problem. */
+ break;
+ default:
+ return scripts->scripts[i].status;
+ }
+ }
+
+ /* All OK! */
+ return 0;
+}
+
+/* called when child is finished */
+static void ctdb_event_script_handler(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *p)
+{
+ struct ctdb_event_script_state *state =
+ talloc_get_type(p, struct ctdb_event_script_state);
+ struct ctdb_script_wire *current = get_current_script(state);
+ struct ctdb_context *ctdb = state->ctdb;
+ int r, status;
+
+ if (ctdb == NULL) {
+ DEBUG(DEBUG_ERR,("Eventscript finished but ctdb is NULL\n"));
+ return;
+ }
+
+ r = read(state->fd[0], ¤t->status, sizeof(current->status));
+ if (r < 0) {
+ current->status = -errno;
+ } else if (r != sizeof(current->status)) {
+ current->status = -EIO;
+ }
+
+ current->finished = timeval_current();
+ /* valgrind gets overloaded if we run next script as it's still doing
+ * post-execution analysis, so kill finished child here. */
+ if (ctdb->valgrinding) {
+ kill(state->child, SIGKILL);
+ }
+
+ state->child = 0;
+
+ status = script_status(state->scripts);
+
+ /* Aborted or finished all scripts? We're done. */
+ if (status != 0 || state->current+1 == state->scripts->num_scripts) {
+ DEBUG(DEBUG_INFO,(__location__ " Eventscript %s %s finished with state %d\n",
+ ctdb_eventscript_call_names[state->call], state->options, status));
+
+ ctdb->event_script_timeouts = 0;
+ talloc_free(state);
+ return;
+ }
+
+ /* Forget about that old fd. */
+ talloc_free(fde);
+
+ /* Next script! */
+ state->current++;
+ current++;
+ current->status = fork_child_for_script(ctdb, state);
+ if (current->status != 0) {
+ /* This calls the callback. */
+ talloc_free(state);
+ }
+}
+
+static void debug_timeout(struct ctdb_event_script_state *state)
+{
+ struct ctdb_script_wire *current = get_current_script(state);
+ char *cmd;
+ pid_t pid;
+ time_t t;
+ char tbuf[100], buf[200];
+
+ cmd = child_command_string(state->ctdb, state,
+ state->from_user, current->name,
+ state->call, state->options);
+ CTDB_NO_MEMORY_VOID(state->ctdb, cmd);
+
+ DEBUG(DEBUG_ERR,("Timed out running script '%s' after %.1f seconds pid :%d\n",
+ cmd, timeval_elapsed(¤t->start), state->child));
+ talloc_free(cmd);
+
+ t = time(NULL);
+ strftime(tbuf, sizeof(tbuf)-1, "%Y%m%d%H%M%S", localtime(&t));
+ sprintf(buf, "{ pstree -p; cat /proc/locks; ls -li /var/ctdb/ /var/ctdb/persistent; }"
+ " >/tmp/ctdb.event.%s.%d", tbuf, getpid());
+
+ pid = ctdb_fork(state->ctdb);
+ if (pid == 0) {
+ system(buf);
+ /* Now we can kill the child */
+ kill(state->child, SIGTERM);
+ exit(0);
+ }
+ if (pid == -1) {
+ DEBUG(DEBUG_ERR,("Fork for debug script failed : %s\n",
+ strerror(errno)));
+ } else {
+ DEBUG(DEBUG_ERR,("Logged timedout eventscript : %s\n", buf));
+ /* Don't kill child until timeout done. */
+ state->child = 0;
+ }
+}
+
+/* called when child times out */
+static void ctdb_event_script_timeout(struct event_context *ev, struct timed_event *te,
+ struct timeval t, void *p)
+{
+ struct ctdb_event_script_state *state = talloc_get_type(p, struct ctdb_event_script_state);
+ struct ctdb_context *ctdb = state->ctdb;
+ struct ctdb_script_wire *current = get_current_script(state);
+
+ DEBUG(DEBUG_ERR,("Event script timed out : %s %s %s count : %u pid : %d\n",
+ current->name, ctdb_eventscript_call_names[state->call], state->options, ctdb->event_script_timeouts, state->child));
+
+ /* ignore timeouts for these events */
+ switch (state->call) {
+ case CTDB_EVENT_START_RECOVERY:
+ case CTDB_EVENT_RECOVERED:
+ case CTDB_EVENT_TAKE_IP:
+ case CTDB_EVENT_RELEASE_IP:
+ case CTDB_EVENT_STOPPED:
+ case CTDB_EVENT_MONITOR:
+ case CTDB_EVENT_STATUS:
+ state->scripts->scripts[state->current].status = 0;
+ DEBUG(DEBUG_ERR,("Ignoring hung script for %s call %d\n", state->options, state->call));
+ break;
+ default:
+ state->scripts->scripts[state->current].status = -ETIME;
+ debug_timeout(state);
+ }
+
+ talloc_free(state);
+}
+
+/*
+ destroy an event script: kill it if ->child != 0.
+ */
+static int event_script_destructor(struct ctdb_event_script_state *state)
+{
+ int status;
+ struct event_script_callback *callback;
+
+ if (state->child) {
+ DEBUG(DEBUG_ERR,(__location__ " Sending SIGTERM to child pid:%d\n", state->child));
+
+ if (kill(state->child, SIGTERM) != 0) {
+ DEBUG(DEBUG_ERR,("Failed to kill child process for eventscript, errno %s(%d)\n", strerror(errno), errno));
+ }
+ }
+
+ /* If we were the current monitor, we no longer are. */
+ if (state->ctdb->current_monitor == state) {
+ state->ctdb->current_monitor = NULL;
+ }
+
+ /* Save our scripts as the last executed status, if we have them.
+ * See ctdb_event_script_callback_v where we abort monitor event. */
+ if (state->scripts) {
+ talloc_free(state->ctdb->last_status[state->call]);
+ state->ctdb->last_status[state->call] = state->scripts;
+ if (state->current < state->ctdb->last_status[state->call]->num_scripts) {
+ state->ctdb->last_status[state->call]->num_scripts = state->current+1;
+ }
+ }
+
+ /* Use last status as result, or "OK" if none. */
+ if (state->ctdb->last_status[state->call]) {
+ status = script_status(state->ctdb->last_status[state->call]);
+ } else {
+ status = 0;
+ }
+
+ /* This is allowed to free us; talloc will prevent double free anyway,
+ * but beware if you call this outside the destructor! */
+ callback = state->callback;
+
+ if (callback) {
+ /* Make sure destructor doesn't free itself! */
+ talloc_steal(NULL, callback);
+ callback->fn(state->ctdb, status, callback->private_data);
+ talloc_free(callback);
+ }
+
+ return 0;
+}
+
+static unsigned int count_words(const char *options)
+{
+ unsigned int words = 0;
+
+ options += strspn(options, " \t");
+ while (*options) {
+ words++;
+ options += strcspn(options, " \t");
+ options += strspn(options, " \t");
+ }
+ return words;
+}
+
+static bool check_options(enum ctdb_eventscript_call 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_STOPPED:
+ case CTDB_EVENT_MONITOR:
+ case CTDB_EVENT_STATUS:
+ case CTDB_EVENT_SHUTDOWN:
+ case CTDB_EVENT_RELOAD:
+ 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_eventscript_call %u\n", call));
+ return false;
+ }
+}
+
+static int remove_callback(struct event_script_callback *callback)
+{
+ /* Detach ourselves from the running script state */
+ callback->state->callback = NULL;
+ return 0;
+}
+
+/*
+ run the event script in the background, calling the callback when
+ finished
+ */
+static int ctdb_event_script_callback_v(struct ctdb_context *ctdb,
+ const void *mem_ctx,
+ void (*callback)(struct ctdb_context *, int, void *),
+ void *private_data,
+ bool from_user,
+ enum ctdb_eventscript_call call,
+ const char *fmt, va_list ap)
+{
+ struct ctdb_event_script_state *state;
+
+ state = talloc(ctdb->event_script_ctx, struct ctdb_event_script_state);
+ CTDB_NO_MEMORY(ctdb, state);
+
+ /* The callback isn't done if the context is freed. */
+ state->callback = talloc(mem_ctx, struct event_script_callback);
+ CTDB_NO_MEMORY(ctdb, state->callback);
+ talloc_set_destructor(state->callback, remove_callback);
+ state->callback->state = state;
+ state->callback->fn = callback;
+ state->callback->private_data = private_data;
+
+ state->ctdb = ctdb;
+ state->from_user = from_user;
+ state->call = call;
+ state->options = talloc_vasprintf(state, fmt, ap);
+ state->timeout = timeval_set(ctdb->tunable.script_timeout, 0);
+ state->scripts = NULL;
+ if (state->options == NULL) {
+ DEBUG(DEBUG_ERR, (__location__ " could not allocate state->options\n"));
+ talloc_free(state);
+ return -1;
+ }
+ if (!check_options(state->call, state->options)) {
+ DEBUG(DEBUG_ERR, ("Bad eventscript options '%s' for %s\n",
+ ctdb_eventscript_call_names[state->call], state->options));
+ talloc_free(state);
+ return -1;
+ }
+
+ if (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
+ /* we guarantee that only some specifically allowed event scripts are run
+ while in recovery */
+ const enum ctdb_eventscript_call allowed_calls[] = {
+ CTDB_EVENT_INIT,
+ CTDB_EVENT_SETUP,
+ CTDB_EVENT_START_RECOVERY,
+ CTDB_EVENT_SHUTDOWN,
+ CTDB_EVENT_RELEASE_IP,
+ CTDB_EVENT_STOPPED
+ };
+ int i;
+ for (i=0;i<ARRAY_SIZE(allowed_calls);i++) {
+ if (call == allowed_calls[i]) break;
+ }
+ if (i == ARRAY_SIZE(allowed_calls)) {
+ DEBUG(DEBUG_ERR,("Refusing to run event scripts call '%s' while in recovery\n",
+ ctdb_eventscript_call_names[call]));
+ talloc_free(state);
+ return -1;
+ }
+ }
+
+ /* Kill off any running monitor events to run this event. */
+ if (ctdb->current_monitor) {
+ /* Discard script status so we don't save to last_status */
+ talloc_free(ctdb->current_monitor->scripts);
+ ctdb->current_monitor->scripts = NULL;
+ talloc_free(ctdb->current_monitor);
+ ctdb->current_monitor = NULL;
+ }
+
+ DEBUG(DEBUG_INFO,(__location__ " Starting eventscript %s %s\n",
+ ctdb_eventscript_call_names[state->call],
+ state->options));
+
+ /* This is not a child of state, since we save it in destructor. */
+ state->scripts = ctdb_get_script_list(ctdb, ctdb);
+ if (state->scripts == NULL) {
+ talloc_free(state);
+ return -1;
+ }
+ state->current = 0;
+ state->child = 0;
+
+ if (!from_user && (call == CTDB_EVENT_MONITOR || call == CTDB_EVENT_STATUS)) {
+ ctdb->current_monitor = state;
+ }
+
+ talloc_set_destructor(state, event_script_destructor);
+
+ /* Nothing to do? */
+ if (state->scripts->num_scripts == 0) {
+ talloc_free(state);
+ return 0;
+ }
+
+ state->scripts->scripts[0].status = fork_child_for_script(ctdb, state);
+ if (state->scripts->scripts[0].status != 0) {
+ /* Callback is called from destructor, with fail result. */
+ talloc_free(state);
+ return 0;
+ }
+
+ if (!timeval_is_zero(&state->timeout)) {
+ event_add_timed(ctdb->ev, state, timeval_current_ofs(state->timeout.tv_sec, state->timeout.tv_usec), ctdb_event_script_timeout, state);
+ } else {
+ DEBUG(DEBUG_ERR, (__location__ " eventscript %s %s called with no timeout\n",
+ ctdb_eventscript_call_names[state->call],
+ state->options));
+ }
+
+ return 0;
+}
+
+
+/*
+ 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,
+ bool from_user,
+ enum ctdb_eventscript_call call,
+ const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = ctdb_event_script_callback_v(ctdb, mem_ctx, callback, private_data, from_user, call, fmt, ap);
+ va_end(ap);
+
+ return ret;
+}
+
+
+struct callback_status {
+ bool done;
+ int status;
+};
+
+/*
+ called when ctdb_event_script() finishes
+ */
+static void event_script_callback(struct ctdb_context *ctdb, int status, void *private_data)
+{
+ struct callback_status *s = (struct callback_status *)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_eventscript_call call,
+ const char *fmt, ...)
+{
+ va_list ap;
+ int ret;
+ struct callback_status status;
+
+ va_start(ap, fmt);
+ ret = ctdb_event_script_callback_v(ctdb, ctdb,
+ event_script_callback, &status, false, call, fmt, ap);
+ if (ret != 0) {
+ return ret;
+ }
+ va_end(ap);
+
+ status.status = -1;
+ status.done = false;
+
+ while (status.done == false && event_loop_once(ctdb->ev) == 0) /* noop */;
+
+ if (status.status == -ETIME) {
+ DEBUG(DEBUG_ERR, (__location__ " eventscript for '%s' timedout."
+ " Immediately banning ourself for %d seconds\n",
+ ctdb_eventscript_call_names[call],
+ ctdb->tunable.recovery_ban_period));
+ ctdb_ban_self(ctdb);
+ }
+
+ return status.status;
+}
+
+int ctdb_event_script(struct ctdb_context *ctdb, enum ctdb_eventscript_call call)
+{
+ /* GCC complains about empty format string, so use %s and "". */
+ return ctdb_event_script_args(ctdb, call, "%s", "");
+}
+
+struct eventscript_callback_state {
+ struct ctdb_req_control *c;
+};
+
+/*
+ called when a forced eventscript run has finished
+ */
+static void run_eventscripts_callback(struct ctdb_context *ctdb, int status,
+ void *private_data)
+{
+ struct eventscript_callback_state *state =
+ talloc_get_type(private_data, struct eventscript_callback_state);
+
+ ctdb_enable_monitoring(ctdb);
+
+ if (status != 0) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to forcibly run eventscripts\n"));
+ }
+
+ ctdb_request_control_reply(ctdb, state->c, NULL, status, NULL);
+ /* This will free the struct ctdb_event_script_state we are in! */
+ talloc_free(state);
+ return;
+}
+
+
+/* Returns rest of string, or NULL if no match. */
+static const char *get_call(const char *p, enum ctdb_eventscript_call *call)
+{
+ unsigned int len;
+
+ /* Skip any initial whitespace. */
+ p += strspn(p, " \t");
+
+ /* See if we match any. */
+ for (*call = 0; *call < CTDB_EVENT_MAX; (*call)++) {
+ len = strlen(ctdb_eventscript_call_names[*call]);
+ if (strncmp(p, ctdb_eventscript_call_names[*call], len) == 0) {
+ /* If end of string or whitespace, we're done. */
+ if (strcspn(p + len, " \t") == 0) {
+ return p + len;
+ }
+ }
+ }
+ return NULL;
+}
+
+/*
+ A control to force running of the eventscripts from the ctdb client tool
+*/
+int32_t ctdb_run_eventscripts(struct ctdb_context *ctdb,
+ struct ctdb_req_control *c,
+ TDB_DATA indata, bool *async_reply)
+{
+ int ret;
+ struct eventscript_callback_state *state;
+ const char *options;
+ enum ctdb_eventscript_call call;
+
+ /* Figure out what call they want. */
+ options = get_call((const char *)indata.dptr, &call);
+ if (!options) {
+ DEBUG(DEBUG_ERR, (__location__ " Invalid forced \"%s\"\n", (const char *)indata.dptr));
+ return -1;
+ }
+
+ if (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
+ DEBUG(DEBUG_ERR, (__location__ " Aborted running eventscript \"%s\" while in RECOVERY mode\n", indata.dptr));
+ return -1;
+ }
+
+ state = talloc(ctdb->event_script_ctx, struct eventscript_callback_state);
+ CTDB_NO_MEMORY(ctdb, state);
+
+ state->c = talloc_steal(state, c);
+
+ DEBUG(DEBUG_NOTICE,("Forced running of eventscripts with arguments %s\n", indata.dptr));
+
+ ctdb_disable_monitoring(ctdb);
+
+ ret = ctdb_event_script_callback(ctdb,
+ state, run_eventscripts_callback, state,
+ true, call, "%s", options);
+
+ if (ret != 0) {
+ ctdb_enable_monitoring(ctdb);
+ DEBUG(DEBUG_ERR,(__location__ " Failed to run eventscripts with arguments %s\n", indata.dptr));
+ talloc_free(state);
+ return -1;
+ }
+
+ /* tell ctdb_control.c that we will be replying asynchronously */
+ *async_reply = true;
+
+ return 0;
+}
+
+
+
+int32_t ctdb_control_enable_script(struct ctdb_context *ctdb, TDB_DATA indata)
+{
+ const char *script;
+ struct stat st;
+ char *filename;
+ TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
+
+ script = (char *)indata.dptr;
+ if (indata.dsize == 0) {
+ DEBUG(DEBUG_ERR,(__location__ " No script specified.\n"));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+ if (indata.dptr[indata.dsize - 1] != '\0') {
+ DEBUG(DEBUG_ERR,(__location__ " String is not null terminated.\n"));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+ if (index(script,'/') != NULL) {
+ DEBUG(DEBUG_ERR,(__location__ " Script name contains '/'. Failed to enable script %s\n", script));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+
+ if (stat(ctdb->event_script_dir, &st) != 0 &&
+ errno == ENOENT) {
+ DEBUG(DEBUG_CRIT,("No event script directory found at '%s'\n", ctdb->event_script_dir));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+
+ filename = talloc_asprintf(tmp_ctx, "%s/%s", ctdb->event_script_dir, script);
+ if (filename == NULL) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to create script path\n"));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+ if (stat(filename, &st) != 0) {
+ DEBUG(DEBUG_ERR,("Could not stat event script %s. Failed to enable script.\n", filename));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+ if (chmod(filename, st.st_mode | S_IXUSR) == -1) {
+ DEBUG(DEBUG_ERR,("Could not chmod %s. Failed to enable script.\n", filename));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+ talloc_free(tmp_ctx);
+ return 0;
+}
+
+int32_t ctdb_control_disable_script(struct ctdb_context *ctdb, TDB_DATA indata)
+{
+ const char *script;
+ struct stat st;
+ char *filename;
+ TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
+
+ script = (char *)indata.dptr;
+ if (indata.dsize == 0) {
+ DEBUG(DEBUG_ERR,(__location__ " No script specified.\n"));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+ if (indata.dptr[indata.dsize - 1] != '\0') {
+ DEBUG(DEBUG_ERR,(__location__ " String is not null terminated.\n"));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+ if (index(script,'/') != NULL) {
+ DEBUG(DEBUG_ERR,(__location__ " Script name contains '/'. Failed to disable script %s\n", script));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+
+ if (stat(ctdb->event_script_dir, &st) != 0 &&
+ errno == ENOENT) {
+ DEBUG(DEBUG_CRIT,("No event script directory found at '%s'\n", ctdb->event_script_dir));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+
+ filename = talloc_asprintf(tmp_ctx, "%s/%s", ctdb->event_script_dir, script);
+ if (filename == NULL) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to create script path\n"));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+ if (stat(filename, &st) != 0) {
+ DEBUG(DEBUG_ERR,("Could not stat event script %s. Failed to disable script.\n", filename));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+ if (chmod(filename, st.st_mode & ~(S_IXUSR|S_IXGRP|S_IXOTH)) == -1) {
+ DEBUG(DEBUG_ERR,("Could not chmod %s. Failed to disable script.\n", filename));
+ talloc_free(tmp_ctx);
+ return -1;
+ }
+
+ talloc_free(tmp_ctx);
+ return 0;
+}
git.samba.org / obnox / samba / samba-obnox.git / blobdiff